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authorMartin Liska <mliska@suse.cz>2022-01-14 16:56:44 +0100
committerMartin Liska <mliska@suse.cz>2022-01-17 22:12:04 +0100
commit5c69acb32329d49e58c26fa41ae74229a52b9106 (patch)
treeddb05f9d73afb6f998457d2ac4b720e3b3b60483 /gcc/tree-ssa-structalias.c
parent490e23032baaece71f2ec09fa1805064b150fbc2 (diff)
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Rename .c files to .cc files.
gcc/ada/ChangeLog: * adadecode.c: Moved to... * adadecode.cc: ...here. * affinity.c: Moved to... * affinity.cc: ...here. * argv-lynxos178-raven-cert.c: Moved to... * argv-lynxos178-raven-cert.cc: ...here. * argv.c: Moved to... * argv.cc: ...here. * aux-io.c: Moved to... * aux-io.cc: ...here. * cio.c: Moved to... * cio.cc: ...here. * cstreams.c: Moved to... * cstreams.cc: ...here. * env.c: Moved to... * env.cc: ...here. * exit.c: Moved to... * exit.cc: ...here. * expect.c: Moved to... * expect.cc: ...here. * final.c: Moved to... * final.cc: ...here. * gcc-interface/cuintp.c: Moved to... * gcc-interface/cuintp.cc: ...here. * gcc-interface/decl.c: Moved to... * gcc-interface/decl.cc: ...here. * gcc-interface/misc.c: Moved to... * gcc-interface/misc.cc: ...here. * gcc-interface/targtyps.c: Moved to... * gcc-interface/targtyps.cc: ...here. * gcc-interface/trans.c: Moved to... * gcc-interface/trans.cc: ...here. * gcc-interface/utils.c: Moved to... * gcc-interface/utils.cc: ...here. * gcc-interface/utils2.c: Moved to... * gcc-interface/utils2.cc: ...here. * init.c: Moved to... * init.cc: ...here. * initialize.c: Moved to... * initialize.cc: ...here. * libgnarl/thread.c: Moved to... * libgnarl/thread.cc: ...here. * link.c: Moved to... * link.cc: ...here. * locales.c: Moved to... * locales.cc: ...here. * mkdir.c: Moved to... * mkdir.cc: ...here. * raise.c: Moved to... * raise.cc: ...here. * rtfinal.c: Moved to... * rtfinal.cc: ...here. * rtinit.c: Moved to... * rtinit.cc: ...here. * seh_init.c: Moved to... * seh_init.cc: ...here. * sigtramp-armdroid.c: Moved to... * sigtramp-armdroid.cc: ...here. * sigtramp-ios.c: Moved to... * sigtramp-ios.cc: ...here. * sigtramp-qnx.c: Moved to... * sigtramp-qnx.cc: ...here. * sigtramp-vxworks.c: Moved to... * sigtramp-vxworks.cc: ...here. * socket.c: Moved to... * socket.cc: ...here. * tracebak.c: Moved to... * tracebak.cc: ...here. * version.c: Moved to... * version.cc: ...here. * vx_stack_info.c: Moved to... * vx_stack_info.cc: ...here. gcc/ChangeLog: * adjust-alignment.c: Moved to... * adjust-alignment.cc: ...here. * alias.c: Moved to... * alias.cc: ...here. * alloc-pool.c: Moved to... * alloc-pool.cc: ...here. * asan.c: Moved to... * asan.cc: ...here. * attribs.c: Moved to... * attribs.cc: ...here. * auto-inc-dec.c: Moved to... * auto-inc-dec.cc: ...here. * auto-profile.c: Moved to... * auto-profile.cc: ...here. * bb-reorder.c: Moved to... * bb-reorder.cc: ...here. * bitmap.c: Moved to... * bitmap.cc: ...here. * btfout.c: Moved to... * btfout.cc: ...here. * builtins.c: Moved to... * builtins.cc: ...here. * caller-save.c: Moved to... * caller-save.cc: ...here. * calls.c: Moved to... * calls.cc: ...here. * ccmp.c: Moved to... * ccmp.cc: ...here. * cfg.c: Moved to... * cfg.cc: ...here. * cfganal.c: Moved to... * cfganal.cc: ...here. * cfgbuild.c: Moved to... * cfgbuild.cc: ...here. * cfgcleanup.c: Moved to... * cfgcleanup.cc: ...here. * cfgexpand.c: Moved to... * cfgexpand.cc: ...here. * cfghooks.c: Moved to... * cfghooks.cc: ...here. * cfgloop.c: Moved to... * cfgloop.cc: ...here. * cfgloopanal.c: Moved to... * cfgloopanal.cc: ...here. * cfgloopmanip.c: Moved to... * cfgloopmanip.cc: ...here. * cfgrtl.c: Moved to... * cfgrtl.cc: ...here. * cgraph.c: Moved to... * cgraph.cc: ...here. * cgraphbuild.c: Moved to... * cgraphbuild.cc: ...here. * cgraphclones.c: Moved to... * cgraphclones.cc: ...here. * cgraphunit.c: Moved to... * cgraphunit.cc: ...here. * collect-utils.c: Moved to... * collect-utils.cc: ...here. * collect2-aix.c: Moved to... * collect2-aix.cc: ...here. * collect2.c: Moved to... * collect2.cc: ...here. * combine-stack-adj.c: Moved to... * combine-stack-adj.cc: ...here. * combine.c: Moved to... * combine.cc: ...here. * common/common-targhooks.c: Moved to... * common/common-targhooks.cc: ...here. * common/config/aarch64/aarch64-common.c: Moved to... * common/config/aarch64/aarch64-common.cc: ...here. * common/config/alpha/alpha-common.c: Moved to... * common/config/alpha/alpha-common.cc: ...here. * common/config/arc/arc-common.c: Moved to... * common/config/arc/arc-common.cc: ...here. * common/config/arm/arm-common.c: Moved to... * common/config/arm/arm-common.cc: ...here. * common/config/avr/avr-common.c: Moved to... * common/config/avr/avr-common.cc: ...here. * common/config/bfin/bfin-common.c: Moved to... * common/config/bfin/bfin-common.cc: ...here. * common/config/bpf/bpf-common.c: Moved to... * common/config/bpf/bpf-common.cc: ...here. * common/config/c6x/c6x-common.c: Moved to... * common/config/c6x/c6x-common.cc: ...here. * common/config/cr16/cr16-common.c: Moved to... * common/config/cr16/cr16-common.cc: ...here. * common/config/cris/cris-common.c: Moved to... * common/config/cris/cris-common.cc: ...here. * common/config/csky/csky-common.c: Moved to... * common/config/csky/csky-common.cc: ...here. * common/config/default-common.c: Moved to... * common/config/default-common.cc: ...here. * common/config/epiphany/epiphany-common.c: Moved to... * common/config/epiphany/epiphany-common.cc: ...here. * common/config/fr30/fr30-common.c: Moved to... * common/config/fr30/fr30-common.cc: ...here. * common/config/frv/frv-common.c: Moved to... * common/config/frv/frv-common.cc: ...here. * common/config/gcn/gcn-common.c: Moved to... * common/config/gcn/gcn-common.cc: ...here. * common/config/h8300/h8300-common.c: Moved to... * common/config/h8300/h8300-common.cc: ...here. * common/config/i386/i386-common.c: Moved to... * common/config/i386/i386-common.cc: ...here. * common/config/ia64/ia64-common.c: Moved to... * common/config/ia64/ia64-common.cc: ...here. * common/config/iq2000/iq2000-common.c: Moved to... * common/config/iq2000/iq2000-common.cc: ...here. * common/config/lm32/lm32-common.c: Moved to... * common/config/lm32/lm32-common.cc: ...here. * common/config/m32r/m32r-common.c: Moved to... * common/config/m32r/m32r-common.cc: ...here. * common/config/m68k/m68k-common.c: Moved to... * common/config/m68k/m68k-common.cc: ...here. * common/config/mcore/mcore-common.c: Moved to... * common/config/mcore/mcore-common.cc: ...here. * common/config/microblaze/microblaze-common.c: Moved to... * common/config/microblaze/microblaze-common.cc: ...here. * common/config/mips/mips-common.c: Moved to... * common/config/mips/mips-common.cc: ...here. * common/config/mmix/mmix-common.c: Moved to... * common/config/mmix/mmix-common.cc: ...here. * common/config/mn10300/mn10300-common.c: Moved to... * common/config/mn10300/mn10300-common.cc: ...here. * common/config/msp430/msp430-common.c: Moved to... * common/config/msp430/msp430-common.cc: ...here. * common/config/nds32/nds32-common.c: Moved to... * common/config/nds32/nds32-common.cc: ...here. * common/config/nios2/nios2-common.c: Moved to... * common/config/nios2/nios2-common.cc: ...here. * common/config/nvptx/nvptx-common.c: Moved to... * common/config/nvptx/nvptx-common.cc: ...here. * common/config/or1k/or1k-common.c: Moved to... * common/config/or1k/or1k-common.cc: ...here. * common/config/pa/pa-common.c: Moved to... * common/config/pa/pa-common.cc: ...here. * common/config/pdp11/pdp11-common.c: Moved to... * common/config/pdp11/pdp11-common.cc: ...here. * common/config/pru/pru-common.c: Moved to... * common/config/pru/pru-common.cc: ...here. * common/config/riscv/riscv-common.c: Moved to... * common/config/riscv/riscv-common.cc: ...here. * common/config/rs6000/rs6000-common.c: Moved to... * common/config/rs6000/rs6000-common.cc: ...here. * common/config/rx/rx-common.c: Moved to... * common/config/rx/rx-common.cc: ...here. * common/config/s390/s390-common.c: Moved to... * common/config/s390/s390-common.cc: ...here. * common/config/sh/sh-common.c: Moved to... * common/config/sh/sh-common.cc: ...here. * common/config/sparc/sparc-common.c: Moved to... * common/config/sparc/sparc-common.cc: ...here. * common/config/tilegx/tilegx-common.c: Moved to... * common/config/tilegx/tilegx-common.cc: ...here. * common/config/tilepro/tilepro-common.c: Moved to... * common/config/tilepro/tilepro-common.cc: ...here. * common/config/v850/v850-common.c: Moved to... * common/config/v850/v850-common.cc: ...here. * common/config/vax/vax-common.c: Moved to... * common/config/vax/vax-common.cc: ...here. * common/config/visium/visium-common.c: Moved to... * common/config/visium/visium-common.cc: ...here. * common/config/xstormy16/xstormy16-common.c: Moved to... * common/config/xstormy16/xstormy16-common.cc: ...here. * common/config/xtensa/xtensa-common.c: Moved to... * common/config/xtensa/xtensa-common.cc: ...here. * compare-elim.c: Moved to... * compare-elim.cc: ...here. * config/aarch64/aarch64-bti-insert.c: Moved to... * config/aarch64/aarch64-bti-insert.cc: ...here. * config/aarch64/aarch64-builtins.c: Moved to... * config/aarch64/aarch64-builtins.cc: ...here. * config/aarch64/aarch64-c.c: Moved to... * config/aarch64/aarch64-c.cc: ...here. * config/aarch64/aarch64-d.c: Moved to... * config/aarch64/aarch64-d.cc: ...here. * config/aarch64/aarch64.c: Moved to... * config/aarch64/aarch64.cc: ...here. * config/aarch64/cortex-a57-fma-steering.c: Moved to... * config/aarch64/cortex-a57-fma-steering.cc: ...here. * config/aarch64/driver-aarch64.c: Moved to... * config/aarch64/driver-aarch64.cc: ...here. * config/aarch64/falkor-tag-collision-avoidance.c: Moved to... * config/aarch64/falkor-tag-collision-avoidance.cc: ...here. * config/aarch64/host-aarch64-darwin.c: Moved to... * config/aarch64/host-aarch64-darwin.cc: ...here. * config/alpha/alpha.c: Moved to... * config/alpha/alpha.cc: ...here. * config/alpha/driver-alpha.c: Moved to... * config/alpha/driver-alpha.cc: ...here. * config/arc/arc-c.c: Moved to... * config/arc/arc-c.cc: ...here. * config/arc/arc.c: Moved to... * config/arc/arc.cc: ...here. * config/arc/driver-arc.c: Moved to... * config/arc/driver-arc.cc: ...here. * config/arm/aarch-common.c: Moved to... * config/arm/aarch-common.cc: ...here. * config/arm/arm-builtins.c: Moved to... * config/arm/arm-builtins.cc: ...here. * config/arm/arm-c.c: Moved to... * config/arm/arm-c.cc: ...here. * config/arm/arm-d.c: Moved to... * config/arm/arm-d.cc: ...here. * config/arm/arm.c: Moved to... * config/arm/arm.cc: ...here. * config/arm/driver-arm.c: Moved to... * config/arm/driver-arm.cc: ...here. * config/avr/avr-c.c: Moved to... * config/avr/avr-c.cc: ...here. * config/avr/avr-devices.c: Moved to... * config/avr/avr-devices.cc: ...here. * config/avr/avr-log.c: Moved to... * config/avr/avr-log.cc: ...here. * config/avr/avr.c: Moved to... * config/avr/avr.cc: ...here. * config/avr/driver-avr.c: Moved to... * config/avr/driver-avr.cc: ...here. * config/avr/gen-avr-mmcu-specs.c: Moved to... * config/avr/gen-avr-mmcu-specs.cc: ...here. * config/avr/gen-avr-mmcu-texi.c: Moved to... * config/avr/gen-avr-mmcu-texi.cc: ...here. * config/bfin/bfin.c: Moved to... * config/bfin/bfin.cc: ...here. * config/bpf/bpf.c: Moved to... * config/bpf/bpf.cc: ...here. * config/bpf/coreout.c: Moved to... * config/bpf/coreout.cc: ...here. * config/c6x/c6x.c: Moved to... * config/c6x/c6x.cc: ...here. * config/cr16/cr16.c: Moved to... * config/cr16/cr16.cc: ...here. * config/cris/cris.c: Moved to... * config/cris/cris.cc: ...here. * config/csky/csky.c: Moved to... * config/csky/csky.cc: ...here. * config/darwin-c.c: Moved to... * config/darwin-c.cc: ...here. * config/darwin-d.c: Moved to... * config/darwin-d.cc: ...here. * config/darwin-driver.c: Moved to... * config/darwin-driver.cc: ...here. * config/darwin-f.c: Moved to... * config/darwin-f.cc: ...here. * config/darwin.c: Moved to... * config/darwin.cc: ...here. * config/default-c.c: Moved to... * config/default-c.cc: ...here. * config/default-d.c: Moved to... * config/default-d.cc: ...here. * config/dragonfly-d.c: Moved to... * config/dragonfly-d.cc: ...here. * config/epiphany/epiphany.c: Moved to... * config/epiphany/epiphany.cc: ...here. * config/epiphany/mode-switch-use.c: Moved to... * config/epiphany/mode-switch-use.cc: ...here. * config/epiphany/resolve-sw-modes.c: Moved to... * config/epiphany/resolve-sw-modes.cc: ...here. * config/fr30/fr30.c: Moved to... * config/fr30/fr30.cc: ...here. * config/freebsd-d.c: Moved to... * config/freebsd-d.cc: ...here. * config/frv/frv.c: Moved to... * config/frv/frv.cc: ...here. * config/ft32/ft32.c: Moved to... * config/ft32/ft32.cc: ...here. * config/gcn/driver-gcn.c: Moved to... * config/gcn/driver-gcn.cc: ...here. * config/gcn/gcn-run.c: Moved to... * config/gcn/gcn-run.cc: ...here. * config/gcn/gcn-tree.c: Moved to... * config/gcn/gcn-tree.cc: ...here. * config/gcn/gcn.c: Moved to... * config/gcn/gcn.cc: ...here. * config/gcn/mkoffload.c: Moved to... * config/gcn/mkoffload.cc: ...here. * config/glibc-c.c: Moved to... * config/glibc-c.cc: ...here. * config/glibc-d.c: Moved to... * config/glibc-d.cc: ...here. * config/h8300/h8300.c: Moved to... * config/h8300/h8300.cc: ...here. * config/host-darwin.c: Moved to... * config/host-darwin.cc: ...here. * config/host-hpux.c: Moved to... * config/host-hpux.cc: ...here. * config/host-linux.c: Moved to... * config/host-linux.cc: ...here. * config/host-netbsd.c: Moved to... * config/host-netbsd.cc: ...here. * config/host-openbsd.c: Moved to... * config/host-openbsd.cc: ...here. * config/host-solaris.c: Moved to... * config/host-solaris.cc: ...here. * config/i386/djgpp.c: Moved to... * config/i386/djgpp.cc: ...here. * config/i386/driver-i386.c: Moved to... * config/i386/driver-i386.cc: ...here. * config/i386/driver-mingw32.c: Moved to... * config/i386/driver-mingw32.cc: ...here. * config/i386/gnu-property.c: Moved to... * config/i386/gnu-property.cc: ...here. * config/i386/host-cygwin.c: Moved to... * config/i386/host-cygwin.cc: ...here. * config/i386/host-i386-darwin.c: Moved to... * config/i386/host-i386-darwin.cc: ...here. * config/i386/host-mingw32.c: Moved to... * config/i386/host-mingw32.cc: ...here. * config/i386/i386-builtins.c: Moved to... * config/i386/i386-builtins.cc: ...here. * config/i386/i386-c.c: Moved to... * config/i386/i386-c.cc: ...here. * config/i386/i386-d.c: Moved to... * config/i386/i386-d.cc: ...here. * config/i386/i386-expand.c: Moved to... * config/i386/i386-expand.cc: ...here. * config/i386/i386-features.c: Moved to... * config/i386/i386-features.cc: ...here. * config/i386/i386-options.c: Moved to... * config/i386/i386-options.cc: ...here. * config/i386/i386.c: Moved to... * config/i386/i386.cc: ...here. * config/i386/intelmic-mkoffload.c: Moved to... * config/i386/intelmic-mkoffload.cc: ...here. * config/i386/msformat-c.c: Moved to... * config/i386/msformat-c.cc: ...here. * config/i386/winnt-cxx.c: Moved to... * config/i386/winnt-cxx.cc: ...here. * config/i386/winnt-d.c: Moved to... * config/i386/winnt-d.cc: ...here. * config/i386/winnt-stubs.c: Moved to... * config/i386/winnt-stubs.cc: ...here. * config/i386/winnt.c: Moved to... * config/i386/winnt.cc: ...here. * config/i386/x86-tune-sched-atom.c: 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config/mcore/mcore.cc: ...here. * config/microblaze/microblaze-c.c: Moved to... * config/microblaze/microblaze-c.cc: ...here. * config/microblaze/microblaze.c: Moved to... * config/microblaze/microblaze.cc: ...here. * config/mips/driver-native.c: Moved to... * config/mips/driver-native.cc: ...here. * config/mips/frame-header-opt.c: Moved to... * config/mips/frame-header-opt.cc: ...here. * config/mips/mips-d.c: Moved to... * config/mips/mips-d.cc: ...here. * config/mips/mips.c: Moved to... * config/mips/mips.cc: ...here. * config/mmix/mmix.c: Moved to... * config/mmix/mmix.cc: ...here. * config/mn10300/mn10300.c: Moved to... * config/mn10300/mn10300.cc: ...here. * config/moxie/moxie.c: Moved to... * config/moxie/moxie.cc: ...here. * config/msp430/driver-msp430.c: Moved to... * config/msp430/driver-msp430.cc: ...here. * config/msp430/msp430-c.c: Moved to... * config/msp430/msp430-c.cc: ...here. * config/msp430/msp430-devices.c: Moved to... * config/msp430/msp430-devices.cc: ...here. * config/msp430/msp430.c: Moved to... * config/msp430/msp430.cc: ...here. * config/nds32/nds32-cost.c: Moved to... * config/nds32/nds32-cost.cc: ...here. * config/nds32/nds32-fp-as-gp.c: Moved to... * config/nds32/nds32-fp-as-gp.cc: ...here. * config/nds32/nds32-intrinsic.c: Moved to... * config/nds32/nds32-intrinsic.cc: ...here. * config/nds32/nds32-isr.c: Moved to... * config/nds32/nds32-isr.cc: ...here. * config/nds32/nds32-md-auxiliary.c: Moved to... * config/nds32/nds32-md-auxiliary.cc: ...here. * config/nds32/nds32-memory-manipulation.c: Moved to... * config/nds32/nds32-memory-manipulation.cc: ...here. * config/nds32/nds32-pipelines-auxiliary.c: Moved to... * config/nds32/nds32-pipelines-auxiliary.cc: ...here. * config/nds32/nds32-predicates.c: Moved to... * config/nds32/nds32-predicates.cc: ...here. * config/nds32/nds32-relax-opt.c: Moved to... * config/nds32/nds32-relax-opt.cc: ...here. * config/nds32/nds32-utils.c: Moved to... * config/nds32/nds32-utils.cc: ...here. * config/nds32/nds32.c: Moved to... * config/nds32/nds32.cc: ...here. * config/netbsd-d.c: Moved to... * config/netbsd-d.cc: ...here. * config/netbsd.c: Moved to... * config/netbsd.cc: ...here. * config/nios2/nios2.c: Moved to... * config/nios2/nios2.cc: ...here. * config/nvptx/mkoffload.c: Moved to... * config/nvptx/mkoffload.cc: ...here. * config/nvptx/nvptx-c.c: Moved to... * config/nvptx/nvptx-c.cc: ...here. * config/nvptx/nvptx.c: Moved to... * config/nvptx/nvptx.cc: ...here. * config/openbsd-d.c: Moved to... * config/openbsd-d.cc: ...here. * config/or1k/or1k.c: Moved to... * config/or1k/or1k.cc: ...here. * config/pa/pa-d.c: Moved to... * config/pa/pa-d.cc: ...here. * config/pa/pa.c: Moved to... * config/pa/pa.cc: ...here. * config/pdp11/pdp11.c: Moved to... * config/pdp11/pdp11.cc: ...here. * config/pru/pru-passes.c: Moved to... * config/pru/pru-passes.cc: ...here. * config/pru/pru-pragma.c: Moved to... * config/pru/pru-pragma.cc: ...here. * config/pru/pru.c: Moved to... * config/pru/pru.cc: ...here. * config/riscv/riscv-builtins.c: Moved to... * config/riscv/riscv-builtins.cc: ...here. * config/riscv/riscv-c.c: Moved to... * config/riscv/riscv-c.cc: ...here. * config/riscv/riscv-d.c: Moved to... * config/riscv/riscv-d.cc: ...here. * config/riscv/riscv-shorten-memrefs.c: Moved to... * config/riscv/riscv-shorten-memrefs.cc: ...here. * config/riscv/riscv-sr.c: Moved to... * config/riscv/riscv-sr.cc: ...here. * config/riscv/riscv.c: Moved to... * config/riscv/riscv.cc: ...here. * config/rl78/rl78-c.c: Moved to... * config/rl78/rl78-c.cc: ...here. * config/rl78/rl78.c: Moved to... * config/rl78/rl78.cc: ...here. * config/rs6000/driver-rs6000.c: Moved to... * config/rs6000/driver-rs6000.cc: ...here. * config/rs6000/host-darwin.c: Moved to... * config/rs6000/host-darwin.cc: ...here. * config/rs6000/host-ppc64-darwin.c: Moved to... * config/rs6000/host-ppc64-darwin.cc: ...here. * config/rs6000/rbtree.c: Moved to... * config/rs6000/rbtree.cc: ...here. * config/rs6000/rs6000-c.c: Moved to... * config/rs6000/rs6000-c.cc: ...here. * config/rs6000/rs6000-call.c: Moved to... * config/rs6000/rs6000-call.cc: ...here. * config/rs6000/rs6000-d.c: Moved to... * config/rs6000/rs6000-d.cc: ...here. * config/rs6000/rs6000-gen-builtins.c: Moved to... * config/rs6000/rs6000-gen-builtins.cc: ...here. * config/rs6000/rs6000-linux.c: Moved to... * config/rs6000/rs6000-linux.cc: ...here. * config/rs6000/rs6000-logue.c: Moved to... * config/rs6000/rs6000-logue.cc: ...here. * config/rs6000/rs6000-p8swap.c: Moved to... * config/rs6000/rs6000-p8swap.cc: ...here. * config/rs6000/rs6000-pcrel-opt.c: Moved to... * config/rs6000/rs6000-pcrel-opt.cc: ...here. * config/rs6000/rs6000-string.c: Moved to... * config/rs6000/rs6000-string.cc: ...here. * config/rs6000/rs6000.c: Moved to... * config/rs6000/rs6000.cc: ...here. * config/rx/rx.c: Moved to... * config/rx/rx.cc: ...here. * config/s390/driver-native.c: Moved to... * config/s390/driver-native.cc: ...here. * config/s390/s390-c.c: Moved to... * config/s390/s390-c.cc: ...here. * config/s390/s390-d.c: Moved to... * config/s390/s390-d.cc: ...here. * config/s390/s390.c: Moved to... * config/s390/s390.cc: ...here. * config/sh/divtab-sh4-300.c: Moved to... * config/sh/divtab-sh4-300.cc: ...here. * config/sh/divtab-sh4.c: Moved to... * config/sh/divtab-sh4.cc: ...here. * config/sh/divtab.c: Moved to... * config/sh/divtab.cc: ...here. * config/sh/sh-c.c: Moved to... * config/sh/sh-c.cc: ...here. * config/sh/sh.c: Moved to... * config/sh/sh.cc: ...here. * config/sol2-c.c: Moved to... * config/sol2-c.cc: ...here. * config/sol2-cxx.c: Moved to... * config/sol2-cxx.cc: ...here. * config/sol2-d.c: Moved to... * config/sol2-d.cc: ...here. * config/sol2-stubs.c: Moved to... * config/sol2-stubs.cc: ...here. * config/sol2.c: Moved to... * config/sol2.cc: ...here. * config/sparc/driver-sparc.c: Moved to... * config/sparc/driver-sparc.cc: ...here. * config/sparc/sparc-c.c: Moved to... * config/sparc/sparc-c.cc: ...here. * config/sparc/sparc-d.c: Moved to... * config/sparc/sparc-d.cc: ...here. * config/sparc/sparc.c: Moved to... * config/sparc/sparc.cc: ...here. * config/stormy16/stormy16.c: Moved to... * config/stormy16/stormy16.cc: ...here. * config/tilegx/mul-tables.c: Moved to... * config/tilegx/mul-tables.cc: ...here. * config/tilegx/tilegx-c.c: Moved to... * config/tilegx/tilegx-c.cc: ...here. * config/tilegx/tilegx.c: Moved to... * config/tilegx/tilegx.cc: ...here. * config/tilepro/mul-tables.c: Moved to... * config/tilepro/mul-tables.cc: ...here. * config/tilepro/tilepro-c.c: Moved to... * config/tilepro/tilepro-c.cc: ...here. * config/tilepro/tilepro.c: Moved to... * config/tilepro/tilepro.cc: ...here. * config/v850/v850-c.c: Moved to... * config/v850/v850-c.cc: ...here. * config/v850/v850.c: Moved to... * config/v850/v850.cc: ...here. * config/vax/vax.c: Moved to... * config/vax/vax.cc: ...here. * config/visium/visium.c: Moved to... * config/visium/visium.cc: ...here. * config/vms/vms-c.c: Moved to... * config/vms/vms-c.cc: ...here. * config/vms/vms-f.c: Moved to... * config/vms/vms-f.cc: ...here. * config/vms/vms.c: Moved to... * config/vms/vms.cc: ...here. * config/vxworks-c.c: Moved to... * config/vxworks-c.cc: ...here. * config/vxworks.c: Moved to... * config/vxworks.cc: ...here. * config/winnt-c.c: Moved to... * config/winnt-c.cc: ...here. * config/xtensa/xtensa.c: Moved to... * config/xtensa/xtensa.cc: ...here. * context.c: Moved to... * context.cc: ...here. * convert.c: Moved to... * convert.cc: ...here. * coverage.c: Moved to... * coverage.cc: ...here. * cppbuiltin.c: Moved to... * cppbuiltin.cc: ...here. * cppdefault.c: Moved to... * cppdefault.cc: ...here. * cprop.c: Moved to... * cprop.cc: ...here. * cse.c: Moved to... * cse.cc: ...here. * cselib.c: Moved to... * cselib.cc: ...here. * ctfc.c: Moved to... * ctfc.cc: ...here. * ctfout.c: Moved to... * ctfout.cc: ...here. * data-streamer-in.c: Moved to... * data-streamer-in.cc: ...here. * data-streamer-out.c: Moved to... * data-streamer-out.cc: ...here. * data-streamer.c: Moved to... * data-streamer.cc: ...here. * dbgcnt.c: Moved to... * dbgcnt.cc: ...here. * dbxout.c: Moved to... * dbxout.cc: ...here. * dce.c: Moved to... * dce.cc: ...here. * ddg.c: Moved to... * ddg.cc: ...here. * debug.c: Moved to... * debug.cc: ...here. * df-core.c: Moved to... * df-core.cc: ...here. * df-problems.c: Moved to... * df-problems.cc: ...here. * df-scan.c: Moved to... * df-scan.cc: ...here. * dfp.c: Moved to... * dfp.cc: ...here. * diagnostic-color.c: Moved to... * diagnostic-color.cc: ...here. * diagnostic-show-locus.c: Moved to... * diagnostic-show-locus.cc: ...here. * diagnostic-spec.c: Moved to... * diagnostic-spec.cc: ...here. * diagnostic.c: Moved to... * diagnostic.cc: ...here. * dojump.c: Moved to... * dojump.cc: ...here. * dominance.c: Moved to... * dominance.cc: ...here. * domwalk.c: Moved to... * domwalk.cc: ...here. * double-int.c: Moved to... * double-int.cc: ...here. * dse.c: Moved to... * dse.cc: ...here. * dumpfile.c: Moved to... * dumpfile.cc: ...here. * dwarf2asm.c: Moved to... * dwarf2asm.cc: ...here. * dwarf2cfi.c: Moved to... * dwarf2cfi.cc: ...here. * dwarf2ctf.c: Moved to... * dwarf2ctf.cc: ...here. * dwarf2out.c: Moved to... * dwarf2out.cc: ...here. * early-remat.c: Moved to... * early-remat.cc: ...here. * edit-context.c: Moved to... * edit-context.cc: ...here. * emit-rtl.c: Moved to... * emit-rtl.cc: ...here. * errors.c: Moved to... * errors.cc: ...here. * et-forest.c: Moved to... * et-forest.cc: ...here. * except.c: Moved to... * except.cc: ...here. * explow.c: Moved to... * explow.cc: ...here. * expmed.c: Moved to... * expmed.cc: ...here. * expr.c: Moved to... * expr.cc: ...here. * fibonacci_heap.c: Moved to... * fibonacci_heap.cc: ...here. * file-find.c: Moved to... * file-find.cc: ...here. * file-prefix-map.c: Moved to... * file-prefix-map.cc: ...here. * final.c: Moved to... * final.cc: ...here. * fixed-value.c: Moved to... * fixed-value.cc: ...here. * fold-const-call.c: Moved to... * fold-const-call.cc: ...here. * fold-const.c: Moved to... * fold-const.cc: ...here. * fp-test.c: Moved to... * fp-test.cc: ...here. * function-tests.c: Moved to... * function-tests.cc: ...here. * function.c: Moved to... * function.cc: ...here. * fwprop.c: Moved to... * fwprop.cc: ...here. * gcc-ar.c: Moved to... * gcc-ar.cc: ...here. * gcc-main.c: Moved to... * gcc-main.cc: ...here. * gcc-rich-location.c: Moved to... * gcc-rich-location.cc: ...here. * gcc.c: Moved to... * gcc.cc: ...here. * gcov-dump.c: Moved to... * gcov-dump.cc: ...here. * gcov-io.c: Moved to... * gcov-io.cc: ...here. * gcov-tool.c: Moved to... * gcov-tool.cc: ...here. * gcov.c: Moved to... * gcov.cc: ...here. * gcse-common.c: Moved to... * gcse-common.cc: ...here. * gcse.c: Moved to... * gcse.cc: ...here. * genattr-common.c: Moved to... * genattr-common.cc: ...here. * genattr.c: Moved to... * genattr.cc: ...here. * genattrtab.c: Moved to... * genattrtab.cc: ...here. * genautomata.c: Moved to... * genautomata.cc: ...here. * gencfn-macros.c: Moved to... * gencfn-macros.cc: ...here. * gencheck.c: Moved to... * gencheck.cc: ...here. * genchecksum.c: Moved to... * genchecksum.cc: ...here. * gencodes.c: Moved to... * gencodes.cc: ...here. * genconditions.c: Moved to... * genconditions.cc: ...here. * genconfig.c: Moved to... * genconfig.cc: ...here. * genconstants.c: Moved to... * genconstants.cc: ...here. * genemit.c: Moved to... * genemit.cc: ...here. * genenums.c: Moved to... * genenums.cc: ...here. * generic-match-head.c: Moved to... * generic-match-head.cc: ...here. * genextract.c: Moved to... * genextract.cc: ...here. * genflags.c: Moved to... * genflags.cc: ...here. * gengenrtl.c: Moved to... * gengenrtl.cc: ...here. * gengtype-parse.c: Moved to... * gengtype-parse.cc: ...here. * gengtype-state.c: Moved to... * gengtype-state.cc: ...here. * gengtype.c: Moved to... * gengtype.cc: ...here. * genhooks.c: Moved to... * genhooks.cc: ...here. * genmatch.c: Moved to... * genmatch.cc: ...here. * genmddeps.c: Moved to... * genmddeps.cc: ...here. * genmddump.c: Moved to... * genmddump.cc: ...here. * genmodes.c: Moved to... * genmodes.cc: ...here. * genopinit.c: Moved to... * genopinit.cc: ...here. * genoutput.c: Moved to... * genoutput.cc: ...here. * genpeep.c: Moved to... * genpeep.cc: ...here. * genpreds.c: Moved to... * genpreds.cc: ...here. * genrecog.c: Moved to... * genrecog.cc: ...here. * gensupport.c: Moved to... * gensupport.cc: ...here. * gentarget-def.c: Moved to... * gentarget-def.cc: ...here. * genversion.c: Moved to... * genversion.cc: ...here. * ggc-common.c: Moved to... * ggc-common.cc: ...here. * ggc-none.c: Moved to... * ggc-none.cc: ...here. * ggc-page.c: Moved to... * ggc-page.cc: ...here. * ggc-tests.c: Moved to... * ggc-tests.cc: ...here. * gimple-builder.c: Moved to... * gimple-builder.cc: ...here. * gimple-expr.c: Moved to... * gimple-expr.cc: ...here. * gimple-fold.c: Moved to... * gimple-fold.cc: ...here. * gimple-iterator.c: Moved to... * gimple-iterator.cc: ...here. * gimple-laddress.c: Moved to... * gimple-laddress.cc: ...here. * gimple-loop-jam.c: Moved to... * gimple-loop-jam.cc: ...here. * gimple-low.c: Moved to... * gimple-low.cc: ...here. * gimple-match-head.c: Moved to... * gimple-match-head.cc: ...here. * gimple-pretty-print.c: Moved to... * gimple-pretty-print.cc: ...here. * gimple-ssa-backprop.c: Moved to... * gimple-ssa-backprop.cc: ...here. * gimple-ssa-evrp-analyze.c: Moved to... * gimple-ssa-evrp-analyze.cc: ...here. * gimple-ssa-evrp.c: Moved to... * gimple-ssa-evrp.cc: ...here. * gimple-ssa-isolate-paths.c: Moved to... * gimple-ssa-isolate-paths.cc: ...here. * gimple-ssa-nonnull-compare.c: Moved to... * gimple-ssa-nonnull-compare.cc: ...here. * gimple-ssa-split-paths.c: Moved to... * gimple-ssa-split-paths.cc: ...here. * gimple-ssa-sprintf.c: Moved to... * gimple-ssa-sprintf.cc: ...here. * gimple-ssa-store-merging.c: Moved to... * gimple-ssa-store-merging.cc: ...here. * gimple-ssa-strength-reduction.c: Moved to... * gimple-ssa-strength-reduction.cc: ...here. * gimple-ssa-warn-alloca.c: Moved to... * gimple-ssa-warn-alloca.cc: ...here. * gimple-ssa-warn-restrict.c: Moved to... * gimple-ssa-warn-restrict.cc: ...here. * gimple-streamer-in.c: Moved to... * gimple-streamer-in.cc: ...here. * gimple-streamer-out.c: Moved to... * gimple-streamer-out.cc: ...here. * gimple-walk.c: Moved to... * gimple-walk.cc: ...here. * gimple-warn-recursion.c: Moved to... * gimple-warn-recursion.cc: ...here. * gimple.c: Moved to... * gimple.cc: ...here. * gimplify-me.c: Moved to... * gimplify-me.cc: ...here. * gimplify.c: Moved to... * gimplify.cc: ...here. * godump.c: Moved to... * godump.cc: ...here. * graph.c: Moved to... * graph.cc: ...here. * graphds.c: Moved to... * graphds.cc: ...here. * graphite-dependences.c: Moved to... * graphite-dependences.cc: ...here. * graphite-isl-ast-to-gimple.c: Moved to... * graphite-isl-ast-to-gimple.cc: ...here. * graphite-optimize-isl.c: Moved to... * graphite-optimize-isl.cc: ...here. * graphite-poly.c: Moved to... * graphite-poly.cc: ...here. * graphite-scop-detection.c: Moved to... * graphite-scop-detection.cc: ...here. * graphite-sese-to-poly.c: Moved to... * graphite-sese-to-poly.cc: ...here. * graphite.c: Moved to... * graphite.cc: ...here. * haifa-sched.c: Moved to... * haifa-sched.cc: ...here. * hash-map-tests.c: Moved to... * hash-map-tests.cc: ...here. * hash-set-tests.c: Moved to... * hash-set-tests.cc: ...here. * hash-table.c: Moved to... * hash-table.cc: ...here. * hooks.c: Moved to... * hooks.cc: ...here. * host-default.c: Moved to... * host-default.cc: ...here. * hw-doloop.c: Moved to... * hw-doloop.cc: ...here. * hwint.c: Moved to... * hwint.cc: ...here. * ifcvt.c: Moved to... * ifcvt.cc: ...here. * inchash.c: Moved to... * inchash.cc: ...here. * incpath.c: Moved to... * incpath.cc: ...here. * init-regs.c: Moved to... * init-regs.cc: ...here. * input.c: Moved to... * input.cc: ...here. * internal-fn.c: Moved to... * internal-fn.cc: ...here. * intl.c: Moved to... * intl.cc: ...here. * ipa-comdats.c: Moved to... * ipa-comdats.cc: ...here. * ipa-cp.c: Moved to... * ipa-cp.cc: ...here. * ipa-devirt.c: Moved to... * ipa-devirt.cc: ...here. * ipa-fnsummary.c: Moved to... * ipa-fnsummary.cc: ...here. * ipa-icf-gimple.c: Moved to... * ipa-icf-gimple.cc: ...here. * ipa-icf.c: Moved to... * ipa-icf.cc: ...here. * ipa-inline-analysis.c: Moved to... * ipa-inline-analysis.cc: ...here. * ipa-inline-transform.c: Moved to... * ipa-inline-transform.cc: ...here. * ipa-inline.c: Moved to... * ipa-inline.cc: ...here. * ipa-modref-tree.c: Moved to... * ipa-modref-tree.cc: ...here. * ipa-modref.c: Moved to... * ipa-modref.cc: ...here. * ipa-param-manipulation.c: Moved to... * ipa-param-manipulation.cc: ...here. * ipa-polymorphic-call.c: Moved to... * ipa-polymorphic-call.cc: ...here. * ipa-predicate.c: Moved to... * ipa-predicate.cc: ...here. * ipa-profile.c: Moved to... * ipa-profile.cc: ...here. * ipa-prop.c: Moved to... * ipa-prop.cc: ...here. * ipa-pure-const.c: Moved to... * ipa-pure-const.cc: ...here. * ipa-ref.c: Moved to... * ipa-ref.cc: ...here. * ipa-reference.c: Moved to... * ipa-reference.cc: ...here. * ipa-split.c: Moved to... * ipa-split.cc: ...here. * ipa-sra.c: Moved to... * ipa-sra.cc: ...here. * ipa-utils.c: Moved to... * ipa-utils.cc: ...here. * ipa-visibility.c: Moved to... * ipa-visibility.cc: ...here. * ipa.c: Moved to... * ipa.cc: ...here. * ira-build.c: Moved to... * ira-build.cc: ...here. * ira-color.c: Moved to... * ira-color.cc: ...here. * ira-conflicts.c: Moved to... * ira-conflicts.cc: ...here. * ira-costs.c: Moved to... * ira-costs.cc: ...here. * ira-emit.c: Moved to... * ira-emit.cc: ...here. * ira-lives.c: Moved to... * ira-lives.cc: ...here. * ira.c: Moved to... * ira.cc: ...here. * jump.c: Moved to... * jump.cc: ...here. * langhooks.c: Moved to... * langhooks.cc: ...here. * lcm.c: Moved to... * lcm.cc: ...here. * lists.c: Moved to... * lists.cc: ...here. * loop-doloop.c: Moved to... * loop-doloop.cc: ...here. * loop-init.c: Moved to... * loop-init.cc: ...here. * loop-invariant.c: Moved to... * loop-invariant.cc: ...here. * loop-iv.c: Moved to... * loop-iv.cc: ...here. * loop-unroll.c: Moved to... * loop-unroll.cc: ...here. * lower-subreg.c: Moved to... * lower-subreg.cc: ...here. * lra-assigns.c: Moved to... * lra-assigns.cc: ...here. * lra-coalesce.c: Moved to... * lra-coalesce.cc: ...here. * lra-constraints.c: Moved to... * lra-constraints.cc: ...here. * lra-eliminations.c: Moved to... * lra-eliminations.cc: ...here. * lra-lives.c: Moved to... * lra-lives.cc: ...here. * lra-remat.c: Moved to... * lra-remat.cc: ...here. * lra-spills.c: Moved to... * lra-spills.cc: ...here. * lra.c: Moved to... * lra.cc: ...here. * lto-cgraph.c: Moved to... * lto-cgraph.cc: ...here. * lto-compress.c: Moved to... * lto-compress.cc: ...here. * lto-opts.c: Moved to... * lto-opts.cc: ...here. * lto-section-in.c: Moved to... * lto-section-in.cc: ...here. * lto-section-out.c: Moved to... * lto-section-out.cc: ...here. * lto-streamer-in.c: Moved to... * lto-streamer-in.cc: ...here. * lto-streamer-out.c: Moved to... * lto-streamer-out.cc: ...here. * lto-streamer.c: Moved to... * lto-streamer.cc: ...here. * lto-wrapper.c: Moved to... * lto-wrapper.cc: ...here. * main.c: Moved to... * main.cc: ...here. * mcf.c: Moved to... * mcf.cc: ...here. * mode-switching.c: Moved to... * mode-switching.cc: ...here. * modulo-sched.c: Moved to... * modulo-sched.cc: ...here. * multiple_target.c: Moved to... * multiple_target.cc: ...here. * omp-expand.c: Moved to... * omp-expand.cc: ...here. * omp-general.c: Moved to... * omp-general.cc: ...here. * omp-low.c: Moved to... * omp-low.cc: ...here. * omp-offload.c: Moved to... * omp-offload.cc: ...here. * omp-simd-clone.c: Moved to... * omp-simd-clone.cc: ...here. * opt-suggestions.c: Moved to... * opt-suggestions.cc: ...here. * optabs-libfuncs.c: Moved to... * optabs-libfuncs.cc: ...here. * optabs-query.c: Moved to... * optabs-query.cc: ...here. * optabs-tree.c: Moved to... * optabs-tree.cc: ...here. * optabs.c: Moved to... * optabs.cc: ...here. * opts-common.c: Moved to... * opts-common.cc: ...here. * opts-global.c: Moved to... * opts-global.cc: ...here. * opts.c: Moved to... * opts.cc: ...here. * passes.c: Moved to... * passes.cc: ...here. * plugin.c: Moved to... * plugin.cc: ...here. * postreload-gcse.c: Moved to... * postreload-gcse.cc: ...here. * postreload.c: Moved to... * postreload.cc: ...here. * predict.c: Moved to... * predict.cc: ...here. * prefix.c: Moved to... * prefix.cc: ...here. * pretty-print.c: Moved to... * pretty-print.cc: ...here. * print-rtl-function.c: Moved to... * print-rtl-function.cc: ...here. * print-rtl.c: Moved to... * print-rtl.cc: ...here. * print-tree.c: Moved to... * print-tree.cc: ...here. * profile-count.c: Moved to... * profile-count.cc: ...here. * profile.c: Moved to... * profile.cc: ...here. * read-md.c: Moved to... * read-md.cc: ...here. * read-rtl-function.c: Moved to... * read-rtl-function.cc: ...here. * read-rtl.c: Moved to... * read-rtl.cc: ...here. * real.c: Moved to... * real.cc: ...here. * realmpfr.c: Moved to... * realmpfr.cc: ...here. * recog.c: Moved to... * recog.cc: ...here. * ree.c: Moved to... * ree.cc: ...here. * reg-stack.c: Moved to... * reg-stack.cc: ...here. * regcprop.c: Moved to... * regcprop.cc: ...here. * reginfo.c: Moved to... * reginfo.cc: ...here. * regrename.c: Moved to... * regrename.cc: ...here. * regstat.c: Moved to... * regstat.cc: ...here. * reload.c: Moved to... * reload.cc: ...here. * reload1.c: Moved to... * reload1.cc: ...here. * reorg.c: Moved to... * reorg.cc: ...here. * resource.c: Moved to... * resource.cc: ...here. * rtl-error.c: Moved to... * rtl-error.cc: ...here. * rtl-tests.c: Moved to... * rtl-tests.cc: ...here. * rtl.c: Moved to... * rtl.cc: ...here. * rtlanal.c: Moved to... * rtlanal.cc: ...here. * rtlhash.c: Moved to... * rtlhash.cc: ...here. * rtlhooks.c: Moved to... * rtlhooks.cc: ...here. * rtx-vector-builder.c: Moved to... * rtx-vector-builder.cc: ...here. * run-rtl-passes.c: Moved to... * run-rtl-passes.cc: ...here. * sancov.c: Moved to... * sancov.cc: ...here. * sanopt.c: Moved to... * sanopt.cc: ...here. * sbitmap.c: Moved to... * sbitmap.cc: ...here. * sched-deps.c: Moved to... * sched-deps.cc: ...here. * sched-ebb.c: Moved to... * sched-ebb.cc: ...here. * sched-rgn.c: Moved to... * sched-rgn.cc: ...here. * sel-sched-dump.c: Moved to... * sel-sched-dump.cc: ...here. * sel-sched-ir.c: Moved to... * sel-sched-ir.cc: ...here. * sel-sched.c: Moved to... * sel-sched.cc: ...here. * selftest-diagnostic.c: Moved to... * selftest-diagnostic.cc: ...here. * selftest-rtl.c: Moved to... * selftest-rtl.cc: ...here. * selftest-run-tests.c: Moved to... * selftest-run-tests.cc: ...here. * selftest.c: Moved to... * selftest.cc: ...here. * sese.c: Moved to... * sese.cc: ...here. * shrink-wrap.c: Moved to... * shrink-wrap.cc: ...here. * simplify-rtx.c: Moved to... * simplify-rtx.cc: ...here. * sparseset.c: Moved to... * sparseset.cc: ...here. * spellcheck-tree.c: Moved to... * spellcheck-tree.cc: ...here. * spellcheck.c: Moved to... * spellcheck.cc: ...here. * sreal.c: Moved to... * sreal.cc: ...here. * stack-ptr-mod.c: Moved to... * stack-ptr-mod.cc: ...here. * statistics.c: Moved to... * statistics.cc: ...here. * stmt.c: Moved to... * stmt.cc: ...here. * stor-layout.c: Moved to... * stor-layout.cc: ...here. * store-motion.c: Moved to... * store-motion.cc: ...here. * streamer-hooks.c: Moved to... * streamer-hooks.cc: ...here. * stringpool.c: Moved to... * stringpool.cc: ...here. * substring-locations.c: Moved to... * substring-locations.cc: ...here. * symtab.c: Moved to... * symtab.cc: ...here. * target-globals.c: Moved to... * target-globals.cc: ...here. * targhooks.c: Moved to... * targhooks.cc: ...here. * timevar.c: Moved to... * timevar.cc: ...here. * toplev.c: Moved to... * toplev.cc: ...here. * tracer.c: Moved to... * tracer.cc: ...here. * trans-mem.c: Moved to... * trans-mem.cc: ...here. * tree-affine.c: Moved to... * tree-affine.cc: ...here. * tree-call-cdce.c: Moved to... * tree-call-cdce.cc: ...here. * tree-cfg.c: Moved to... * tree-cfg.cc: ...here. * tree-cfgcleanup.c: Moved to... * tree-cfgcleanup.cc: ...here. * tree-chrec.c: Moved to... * tree-chrec.cc: ...here. * tree-complex.c: Moved to... * tree-complex.cc: ...here. * tree-data-ref.c: Moved to... * tree-data-ref.cc: ...here. * tree-dfa.c: Moved to... * tree-dfa.cc: ...here. * tree-diagnostic.c: Moved to... * tree-diagnostic.cc: ...here. * tree-dump.c: Moved to... * tree-dump.cc: ...here. * tree-eh.c: Moved to... * tree-eh.cc: ...here. * tree-emutls.c: Moved to... * tree-emutls.cc: ...here. * tree-if-conv.c: Moved to... * tree-if-conv.cc: ...here. * tree-inline.c: Moved to... * tree-inline.cc: ...here. * tree-into-ssa.c: Moved to... * tree-into-ssa.cc: ...here. * tree-iterator.c: Moved to... * tree-iterator.cc: ...here. * tree-loop-distribution.c: Moved to... * tree-loop-distribution.cc: ...here. * tree-nested.c: Moved to... * tree-nested.cc: ...here. * tree-nrv.c: Moved to... * tree-nrv.cc: ...here. * tree-object-size.c: Moved to... * tree-object-size.cc: ...here. * tree-outof-ssa.c: Moved to... * tree-outof-ssa.cc: ...here. * tree-parloops.c: Moved to... * tree-parloops.cc: ...here. * tree-phinodes.c: Moved to... * tree-phinodes.cc: ...here. * tree-predcom.c: Moved to... * tree-predcom.cc: ...here. * tree-pretty-print.c: Moved to... * tree-pretty-print.cc: ...here. * tree-profile.c: Moved to... * tree-profile.cc: ...here. * tree-scalar-evolution.c: Moved to... * tree-scalar-evolution.cc: ...here. * tree-sra.c: Moved to... * tree-sra.cc: ...here. * tree-ssa-address.c: Moved to... * tree-ssa-address.cc: ...here. * tree-ssa-alias.c: Moved to... * tree-ssa-alias.cc: ...here. * tree-ssa-ccp.c: Moved to... * tree-ssa-ccp.cc: ...here. * tree-ssa-coalesce.c: Moved to... * tree-ssa-coalesce.cc: ...here. * tree-ssa-copy.c: Moved to... * tree-ssa-copy.cc: ...here. * tree-ssa-dce.c: Moved to... * tree-ssa-dce.cc: ...here. * tree-ssa-dom.c: Moved to... * tree-ssa-dom.cc: ...here. * tree-ssa-dse.c: Moved to... * tree-ssa-dse.cc: ...here. * tree-ssa-forwprop.c: Moved to... * tree-ssa-forwprop.cc: ...here. * tree-ssa-ifcombine.c: Moved to... * tree-ssa-ifcombine.cc: ...here. * tree-ssa-live.c: Moved to... * tree-ssa-live.cc: ...here. * tree-ssa-loop-ch.c: Moved to... * tree-ssa-loop-ch.cc: ...here. * tree-ssa-loop-im.c: Moved to... * tree-ssa-loop-im.cc: ...here. * tree-ssa-loop-ivcanon.c: Moved to... * tree-ssa-loop-ivcanon.cc: ...here. * tree-ssa-loop-ivopts.c: Moved to... * tree-ssa-loop-ivopts.cc: ...here. * tree-ssa-loop-manip.c: Moved to... * tree-ssa-loop-manip.cc: ...here. * tree-ssa-loop-niter.c: Moved to... * tree-ssa-loop-niter.cc: ...here. * tree-ssa-loop-prefetch.c: Moved to... * tree-ssa-loop-prefetch.cc: ...here. * tree-ssa-loop-split.c: Moved to... * tree-ssa-loop-split.cc: ...here. * tree-ssa-loop-unswitch.c: Moved to... * tree-ssa-loop-unswitch.cc: ...here. * tree-ssa-loop.c: Moved to... * tree-ssa-loop.cc: ...here. * tree-ssa-math-opts.c: Moved to... * tree-ssa-math-opts.cc: ...here. * tree-ssa-operands.c: Moved to... * tree-ssa-operands.cc: ...here. * tree-ssa-phiopt.c: Moved to... * tree-ssa-phiopt.cc: ...here. * tree-ssa-phiprop.c: Moved to... * tree-ssa-phiprop.cc: ...here. * tree-ssa-pre.c: Moved to... * tree-ssa-pre.cc: ...here. * tree-ssa-propagate.c: Moved to... * tree-ssa-propagate.cc: ...here. * tree-ssa-reassoc.c: Moved to... * tree-ssa-reassoc.cc: ...here. * tree-ssa-sccvn.c: Moved to... * tree-ssa-sccvn.cc: ...here. * tree-ssa-scopedtables.c: Moved to... * tree-ssa-scopedtables.cc: ...here. * tree-ssa-sink.c: Moved to... * tree-ssa-sink.cc: ...here. * tree-ssa-strlen.c: Moved to... * tree-ssa-strlen.cc: ...here. * tree-ssa-structalias.c: Moved to... * tree-ssa-structalias.cc: ...here. * tree-ssa-tail-merge.c: Moved to... * tree-ssa-tail-merge.cc: ...here. * tree-ssa-ter.c: Moved to... * tree-ssa-ter.cc: ...here. * tree-ssa-threadbackward.c: Moved to... * tree-ssa-threadbackward.cc: ...here. * tree-ssa-threadedge.c: Moved to... * tree-ssa-threadedge.cc: ...here. * tree-ssa-threadupdate.c: Moved to... * tree-ssa-threadupdate.cc: ...here. * tree-ssa-uncprop.c: Moved to... * tree-ssa-uncprop.cc: ...here. * tree-ssa-uninit.c: Moved to... * tree-ssa-uninit.cc: ...here. * tree-ssa.c: Moved to... * tree-ssa.cc: ...here. * tree-ssanames.c: Moved to... * tree-ssanames.cc: ...here. * tree-stdarg.c: Moved to... * tree-stdarg.cc: ...here. * tree-streamer-in.c: Moved to... * tree-streamer-in.cc: ...here. * tree-streamer-out.c: Moved to... * tree-streamer-out.cc: ...here. * tree-streamer.c: Moved to... * tree-streamer.cc: ...here. * tree-switch-conversion.c: Moved to... * tree-switch-conversion.cc: ...here. * tree-tailcall.c: Moved to... * tree-tailcall.cc: ...here. * tree-vect-data-refs.c: Moved to... * tree-vect-data-refs.cc: ...here. * tree-vect-generic.c: Moved to... * tree-vect-generic.cc: ...here. * tree-vect-loop-manip.c: Moved to... * tree-vect-loop-manip.cc: ...here. * tree-vect-loop.c: Moved to... * tree-vect-loop.cc: ...here. * tree-vect-patterns.c: Moved to... * tree-vect-patterns.cc: ...here. * tree-vect-slp-patterns.c: Moved to... * tree-vect-slp-patterns.cc: ...here. * tree-vect-slp.c: Moved to... * tree-vect-slp.cc: ...here. * tree-vect-stmts.c: Moved to... * tree-vect-stmts.cc: ...here. * tree-vector-builder.c: Moved to... * tree-vector-builder.cc: ...here. * tree-vectorizer.c: Moved to... * tree-vectorizer.cc: ...here. * tree-vrp.c: Moved to... * tree-vrp.cc: ...here. * tree.c: Moved to... * tree.cc: ...here. * tsan.c: Moved to... * tsan.cc: ...here. * typed-splay-tree.c: Moved to... * typed-splay-tree.cc: ...here. * ubsan.c: Moved to... * ubsan.cc: ...here. * valtrack.c: Moved to... * valtrack.cc: ...here. * value-prof.c: Moved to... * value-prof.cc: ...here. * var-tracking.c: Moved to... * var-tracking.cc: ...here. * varasm.c: Moved to... * varasm.cc: ...here. * varpool.c: Moved to... * varpool.cc: ...here. * vec-perm-indices.c: Moved to... * vec-perm-indices.cc: ...here. * vec.c: Moved to... * vec.cc: ...here. * vmsdbgout.c: Moved to... * vmsdbgout.cc: ...here. * vr-values.c: Moved to... * vr-values.cc: ...here. * vtable-verify.c: Moved to... * vtable-verify.cc: ...here. * web.c: Moved to... * web.cc: ...here. * xcoffout.c: Moved to... * xcoffout.cc: ...here. gcc/c-family/ChangeLog: * c-ada-spec.c: Moved to... * c-ada-spec.cc: ...here. * c-attribs.c: Moved to... * c-attribs.cc: ...here. * c-common.c: Moved to... * c-common.cc: ...here. * c-cppbuiltin.c: Moved to... * c-cppbuiltin.cc: ...here. * c-dump.c: Moved to... * c-dump.cc: ...here. * c-format.c: Moved to... * c-format.cc: ...here. * c-gimplify.c: Moved to... * c-gimplify.cc: ...here. * c-indentation.c: Moved to... * c-indentation.cc: ...here. * c-lex.c: Moved to... * c-lex.cc: ...here. * c-omp.c: Moved to... * c-omp.cc: ...here. * c-opts.c: Moved to... * c-opts.cc: ...here. * c-pch.c: Moved to... * c-pch.cc: ...here. * c-ppoutput.c: Moved to... * c-ppoutput.cc: ...here. * c-pragma.c: Moved to... * c-pragma.cc: ...here. * c-pretty-print.c: Moved to... * c-pretty-print.cc: ...here. * c-semantics.c: Moved to... * c-semantics.cc: ...here. * c-ubsan.c: Moved to... * c-ubsan.cc: ...here. * c-warn.c: Moved to... * c-warn.cc: ...here. * cppspec.c: Moved to... * cppspec.cc: ...here. * stub-objc.c: Moved to... * stub-objc.cc: ...here. gcc/c/ChangeLog: * c-aux-info.c: Moved to... * c-aux-info.cc: ...here. * c-convert.c: Moved to... * c-convert.cc: ...here. * c-decl.c: Moved to... * c-decl.cc: ...here. * c-errors.c: Moved to... * c-errors.cc: ...here. * c-fold.c: Moved to... * c-fold.cc: ...here. * c-lang.c: Moved to... * c-lang.cc: ...here. * c-objc-common.c: Moved to... * c-objc-common.cc: ...here. * c-parser.c: Moved to... * c-parser.cc: ...here. * c-typeck.c: Moved to... * c-typeck.cc: ...here. * gccspec.c: Moved to... * gccspec.cc: ...here. * gimple-parser.c: Moved to... * gimple-parser.cc: ...here. gcc/cp/ChangeLog: * call.c: Moved to... * call.cc: ...here. * class.c: Moved to... * class.cc: ...here. * constexpr.c: Moved to... * constexpr.cc: ...here. * cp-gimplify.c: Moved to... * cp-gimplify.cc: ...here. * cp-lang.c: Moved to... * cp-lang.cc: ...here. * cp-objcp-common.c: Moved to... * cp-objcp-common.cc: ...here. * cp-ubsan.c: Moved to... * cp-ubsan.cc: ...here. * cvt.c: Moved to... * cvt.cc: ...here. * cxx-pretty-print.c: Moved to... * cxx-pretty-print.cc: ...here. * decl.c: Moved to... * decl.cc: ...here. * decl2.c: Moved to... * decl2.cc: ...here. * dump.c: Moved to... * dump.cc: ...here. * error.c: Moved to... * error.cc: ...here. * except.c: Moved to... * except.cc: ...here. * expr.c: Moved to... * expr.cc: ...here. * friend.c: Moved to... * friend.cc: ...here. * g++spec.c: Moved to... * g++spec.cc: ...here. * init.c: Moved to... * init.cc: ...here. * lambda.c: Moved to... * lambda.cc: ...here. * lex.c: Moved to... * lex.cc: ...here. * mangle.c: Moved to... * mangle.cc: ...here. * method.c: Moved to... * method.cc: ...here. * name-lookup.c: Moved to... * name-lookup.cc: ...here. * optimize.c: Moved to... * optimize.cc: ...here. * parser.c: Moved to... * parser.cc: ...here. * pt.c: Moved to... * pt.cc: ...here. * ptree.c: Moved to... * ptree.cc: ...here. * rtti.c: Moved to... * rtti.cc: ...here. * search.c: Moved to... * search.cc: ...here. * semantics.c: Moved to... * semantics.cc: ...here. * tree.c: Moved to... * tree.cc: ...here. * typeck.c: Moved to... * typeck.cc: ...here. * typeck2.c: Moved to... * typeck2.cc: ...here. * vtable-class-hierarchy.c: Moved to... * vtable-class-hierarchy.cc: ...here. gcc/fortran/ChangeLog: * arith.c: Moved to... * arith.cc: ...here. * array.c: Moved to... * array.cc: ...here. * bbt.c: Moved to... * bbt.cc: ...here. * check.c: Moved to... * check.cc: ...here. * class.c: Moved to... * class.cc: ...here. * constructor.c: Moved to... * constructor.cc: ...here. * convert.c: Moved to... * convert.cc: ...here. * cpp.c: Moved to... * cpp.cc: ...here. * data.c: Moved to... * data.cc: ...here. * decl.c: Moved to... * decl.cc: ...here. * dependency.c: Moved to... * dependency.cc: ...here. * dump-parse-tree.c: Moved to... * dump-parse-tree.cc: ...here. * error.c: Moved to... * error.cc: ...here. * expr.c: Moved to... * expr.cc: ...here. * f95-lang.c: Moved to... * f95-lang.cc: ...here. * frontend-passes.c: Moved to... * frontend-passes.cc: ...here. * gfortranspec.c: Moved to... * gfortranspec.cc: ...here. * interface.c: Moved to... * interface.cc: ...here. * intrinsic.c: Moved to... * intrinsic.cc: ...here. * io.c: Moved to... * io.cc: ...here. * iresolve.c: Moved to... * iresolve.cc: ...here. * match.c: Moved to... * match.cc: ...here. * matchexp.c: Moved to... * matchexp.cc: ...here. * misc.c: Moved to... * misc.cc: ...here. * module.c: Moved to... * module.cc: ...here. * openmp.c: Moved to... * openmp.cc: ...here. * options.c: Moved to... * options.cc: ...here. * parse.c: Moved to... * parse.cc: ...here. * primary.c: Moved to... * primary.cc: ...here. * resolve.c: Moved to... * resolve.cc: ...here. * scanner.c: Moved to... * scanner.cc: ...here. * simplify.c: Moved to... * simplify.cc: ...here. * st.c: Moved to... * st.cc: ...here. * symbol.c: Moved to... * symbol.cc: ...here. * target-memory.c: Moved to... * target-memory.cc: ...here. * trans-array.c: Moved to... * trans-array.cc: ...here. * trans-common.c: Moved to... * trans-common.cc: ...here. * trans-const.c: Moved to... * trans-const.cc: ...here. * trans-decl.c: Moved to... * trans-decl.cc: ...here. * trans-expr.c: Moved to... * trans-expr.cc: ...here. * trans-intrinsic.c: Moved to... * trans-intrinsic.cc: ...here. * trans-io.c: Moved to... * trans-io.cc: ...here. * trans-openmp.c: Moved to... * trans-openmp.cc: ...here. * trans-stmt.c: Moved to... * trans-stmt.cc: ...here. * trans-types.c: Moved to... * trans-types.cc: ...here. * trans.c: Moved to... * trans.cc: ...here. gcc/go/ChangeLog: * go-backend.c: Moved to... * go-backend.cc: ...here. * go-lang.c: Moved to... * go-lang.cc: ...here. * gospec.c: Moved to... * gospec.cc: ...here. gcc/jit/ChangeLog: * dummy-frontend.c: Moved to... * dummy-frontend.cc: ...here. * jit-builtins.c: Moved to... * jit-builtins.cc: ...here. * jit-logging.c: Moved to... * jit-logging.cc: ...here. * jit-playback.c: Moved to... * jit-playback.cc: ...here. * jit-recording.c: Moved to... * jit-recording.cc: ...here. * jit-result.c: Moved to... * jit-result.cc: ...here. * jit-spec.c: Moved to... * jit-spec.cc: ...here. * jit-tempdir.c: Moved to... * jit-tempdir.cc: ...here. * jit-w32.c: Moved to... * jit-w32.cc: ...here. * libgccjit.c: Moved to... * libgccjit.cc: ...here. gcc/lto/ChangeLog: * common.c: Moved to... * common.cc: ...here. * lto-common.c: Moved to... * 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objcp-lang.cc: ...here. libcpp/ChangeLog: * charset.c: Moved to... * charset.cc: ...here. * directives.c: Moved to... * directives.cc: ...here. * errors.c: Moved to... * errors.cc: ...here. * expr.c: Moved to... * expr.cc: ...here. * files.c: Moved to... * files.cc: ...here. * identifiers.c: Moved to... * identifiers.cc: ...here. * init.c: Moved to... * init.cc: ...here. * lex.c: Moved to... * lex.cc: ...here. * line-map.c: Moved to... * line-map.cc: ...here. * macro.c: Moved to... * macro.cc: ...here. * makeucnid.c: Moved to... * makeucnid.cc: ...here. * mkdeps.c: Moved to... * mkdeps.cc: ...here. * pch.c: Moved to... * pch.cc: ...here. * symtab.c: Moved to... * symtab.cc: ...here. * traditional.c: Moved to... * traditional.cc: ...here.
Diffstat (limited to 'gcc/tree-ssa-structalias.c')
-rw-r--r--gcc/tree-ssa-structalias.c8753
1 files changed, 0 insertions, 8753 deletions
diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c
deleted file mode 100644
index d318f88..0000000
--- a/gcc/tree-ssa-structalias.c
+++ /dev/null
@@ -1,8753 +0,0 @@
-/* Tree based points-to analysis
- Copyright (C) 2005-2022 Free Software Foundation, Inc.
- Contributed by Daniel Berlin <dberlin@dberlin.org>
-
- This file is part of GCC.
-
- GCC is free software; you can redistribute it and/or modify
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- GCC is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GCC; see the file COPYING3. If not see
- <http://www.gnu.org/licenses/>. */
-
-#include "config.h"
-#include "system.h"
-#include "coretypes.h"
-#include "backend.h"
-#include "rtl.h"
-#include "tree.h"
-#include "gimple.h"
-#include "alloc-pool.h"
-#include "tree-pass.h"
-#include "ssa.h"
-#include "cgraph.h"
-#include "tree-pretty-print.h"
-#include "diagnostic-core.h"
-#include "fold-const.h"
-#include "stor-layout.h"
-#include "stmt.h"
-#include "gimple-iterator.h"
-#include "tree-into-ssa.h"
-#include "tree-dfa.h"
-#include "gimple-walk.h"
-#include "varasm.h"
-#include "stringpool.h"
-#include "attribs.h"
-#include "tree-ssa.h"
-#include "tree-cfg.h"
-#include "gimple-range.h"
-#include "ipa-modref-tree.h"
-#include "ipa-modref.h"
-#include "attr-fnspec.h"
-
-/* The idea behind this analyzer is to generate set constraints from the
- program, then solve the resulting constraints in order to generate the
- points-to sets.
-
- Set constraints are a way of modeling program analysis problems that
- involve sets. They consist of an inclusion constraint language,
- describing the variables (each variable is a set) and operations that
- are involved on the variables, and a set of rules that derive facts
- from these operations. To solve a system of set constraints, you derive
- all possible facts under the rules, which gives you the correct sets
- as a consequence.
-
- See "Efficient Field-sensitive pointer analysis for C" by "David
- J. Pearce and Paul H. J. Kelly and Chris Hankin", at
- http://citeseer.ist.psu.edu/pearce04efficient.html
-
- Also see "Ultra-fast Aliasing Analysis using CLA: A Million Lines
- of C Code in a Second" by "Nevin Heintze and Olivier Tardieu" at
- http://citeseer.ist.psu.edu/heintze01ultrafast.html
-
- There are three types of real constraint expressions, DEREF,
- ADDRESSOF, and SCALAR. Each constraint expression consists
- of a constraint type, a variable, and an offset.
-
- SCALAR is a constraint expression type used to represent x, whether
- it appears on the LHS or the RHS of a statement.
- DEREF is a constraint expression type used to represent *x, whether
- it appears on the LHS or the RHS of a statement.
- ADDRESSOF is a constraint expression used to represent &x, whether
- it appears on the LHS or the RHS of a statement.
-
- Each pointer variable in the program is assigned an integer id, and
- each field of a structure variable is assigned an integer id as well.
-
- Structure variables are linked to their list of fields through a "next
- field" in each variable that points to the next field in offset
- order.
- Each variable for a structure field has
-
- 1. "size", that tells the size in bits of that field.
- 2. "fullsize", that tells the size in bits of the entire structure.
- 3. "offset", that tells the offset in bits from the beginning of the
- structure to this field.
-
- Thus,
- struct f
- {
- int a;
- int b;
- } foo;
- int *bar;
-
- looks like
-
- foo.a -> id 1, size 32, offset 0, fullsize 64, next foo.b
- foo.b -> id 2, size 32, offset 32, fullsize 64, next NULL
- bar -> id 3, size 32, offset 0, fullsize 32, next NULL
-
-
- In order to solve the system of set constraints, the following is
- done:
-
- 1. Each constraint variable x has a solution set associated with it,
- Sol(x).
-
- 2. Constraints are separated into direct, copy, and complex.
- Direct constraints are ADDRESSOF constraints that require no extra
- processing, such as P = &Q
- Copy constraints are those of the form P = Q.
- Complex constraints are all the constraints involving dereferences
- and offsets (including offsetted copies).
-
- 3. All direct constraints of the form P = &Q are processed, such
- that Q is added to Sol(P)
-
- 4. All complex constraints for a given constraint variable are stored in a
- linked list attached to that variable's node.
-
- 5. A directed graph is built out of the copy constraints. Each
- constraint variable is a node in the graph, and an edge from
- Q to P is added for each copy constraint of the form P = Q
-
- 6. The graph is then walked, and solution sets are
- propagated along the copy edges, such that an edge from Q to P
- causes Sol(P) <- Sol(P) union Sol(Q).
-
- 7. As we visit each node, all complex constraints associated with
- that node are processed by adding appropriate copy edges to the graph, or the
- appropriate variables to the solution set.
-
- 8. The process of walking the graph is iterated until no solution
- sets change.
-
- Prior to walking the graph in steps 6 and 7, We perform static
- cycle elimination on the constraint graph, as well
- as off-line variable substitution.
-
- TODO: Adding offsets to pointer-to-structures can be handled (IE not punted
- on and turned into anything), but isn't. You can just see what offset
- inside the pointed-to struct it's going to access.
-
- TODO: Constant bounded arrays can be handled as if they were structs of the
- same number of elements.
-
- TODO: Modeling heap and incoming pointers becomes much better if we
- add fields to them as we discover them, which we could do.
-
- TODO: We could handle unions, but to be honest, it's probably not
- worth the pain or slowdown. */
-
-/* IPA-PTA optimizations possible.
-
- When the indirect function called is ANYTHING we can add disambiguation
- based on the function signatures (or simply the parameter count which
- is the varinfo size). We also do not need to consider functions that
- do not have their address taken.
-
- The is_global_var bit which marks escape points is overly conservative
- in IPA mode. Split it to is_escape_point and is_global_var - only
- externally visible globals are escape points in IPA mode.
- There is now is_ipa_escape_point but this is only used in a few
- selected places.
-
- The way we introduce DECL_PT_UID to avoid fixing up all points-to
- sets in the translation unit when we copy a DECL during inlining
- pessimizes precision. The advantage is that the DECL_PT_UID keeps
- compile-time and memory usage overhead low - the points-to sets
- do not grow or get unshared as they would during a fixup phase.
- An alternative solution is to delay IPA PTA until after all
- inlining transformations have been applied.
-
- The way we propagate clobber/use information isn't optimized.
- It should use a new complex constraint that properly filters
- out local variables of the callee (though that would make
- the sets invalid after inlining). OTOH we might as well
- admit defeat to WHOPR and simply do all the clobber/use analysis
- and propagation after PTA finished but before we threw away
- points-to information for memory variables. WHOPR and PTA
- do not play along well anyway - the whole constraint solving
- would need to be done in WPA phase and it will be very interesting
- to apply the results to local SSA names during LTRANS phase.
-
- We probably should compute a per-function unit-ESCAPE solution
- propagating it simply like the clobber / uses solutions. The
- solution can go alongside the non-IPA escaped solution and be
- used to query which vars escape the unit through a function.
- This is also required to make the escaped-HEAP trick work in IPA mode.
-
- We never put function decls in points-to sets so we do not
- keep the set of called functions for indirect calls.
-
- And probably more. */
-
-static bool use_field_sensitive = true;
-static int in_ipa_mode = 0;
-
-/* Used for predecessor bitmaps. */
-static bitmap_obstack predbitmap_obstack;
-
-/* Used for points-to sets. */
-static bitmap_obstack pta_obstack;
-
-/* Used for oldsolution members of variables. */
-static bitmap_obstack oldpta_obstack;
-
-/* Used for per-solver-iteration bitmaps. */
-static bitmap_obstack iteration_obstack;
-
-static unsigned int create_variable_info_for (tree, const char *, bool);
-typedef struct constraint_graph *constraint_graph_t;
-static void unify_nodes (constraint_graph_t, unsigned int, unsigned int, bool);
-
-struct constraint;
-typedef struct constraint *constraint_t;
-
-
-#define EXECUTE_IF_IN_NONNULL_BITMAP(a, b, c, d) \
- if (a) \
- EXECUTE_IF_SET_IN_BITMAP (a, b, c, d)
-
-static struct constraint_stats
-{
- unsigned int total_vars;
- unsigned int nonpointer_vars;
- unsigned int unified_vars_static;
- unsigned int unified_vars_dynamic;
- unsigned int iterations;
- unsigned int num_edges;
- unsigned int num_implicit_edges;
- unsigned int points_to_sets_created;
-} stats;
-
-struct variable_info
-{
- /* ID of this variable */
- unsigned int id;
-
- /* True if this is a variable created by the constraint analysis, such as
- heap variables and constraints we had to break up. */
- unsigned int is_artificial_var : 1;
-
- /* True if this is a special variable whose solution set should not be
- changed. */
- unsigned int is_special_var : 1;
-
- /* True for variables whose size is not known or variable. */
- unsigned int is_unknown_size_var : 1;
-
- /* True for (sub-)fields that represent a whole variable. */
- unsigned int is_full_var : 1;
-
- /* True if this is a heap variable. */
- unsigned int is_heap_var : 1;
-
- /* True if this is a register variable. */
- unsigned int is_reg_var : 1;
-
- /* True if this field may contain pointers. */
- unsigned int may_have_pointers : 1;
-
- /* True if this field has only restrict qualified pointers. */
- unsigned int only_restrict_pointers : 1;
-
- /* True if this represents a heap var created for a restrict qualified
- pointer. */
- unsigned int is_restrict_var : 1;
-
- /* True if this represents a global variable. */
- unsigned int is_global_var : 1;
-
- /* True if this represents a module escape point for IPA analysis. */
- unsigned int is_ipa_escape_point : 1;
-
- /* True if this represents a IPA function info. */
- unsigned int is_fn_info : 1;
-
- /* True if this appears as RHS in a ADDRESSOF constraint. */
- unsigned int address_taken : 1;
-
- /* ??? Store somewhere better. */
- unsigned short ruid;
-
- /* The ID of the variable for the next field in this structure
- or zero for the last field in this structure. */
- unsigned next;
-
- /* The ID of the variable for the first field in this structure. */
- unsigned head;
-
- /* Offset of this variable, in bits, from the base variable */
- unsigned HOST_WIDE_INT offset;
-
- /* Size of the variable, in bits. */
- unsigned HOST_WIDE_INT size;
-
- /* Full size of the base variable, in bits. */
- unsigned HOST_WIDE_INT fullsize;
-
- /* In IPA mode the shadow UID in case the variable needs to be duplicated in
- the final points-to solution because it reaches its containing
- function recursively. Zero if none is needed. */
- unsigned int shadow_var_uid;
-
- /* Name of this variable */
- const char *name;
-
- /* Tree that this variable is associated with. */
- tree decl;
-
- /* Points-to set for this variable. */
- bitmap solution;
-
- /* Old points-to set for this variable. */
- bitmap oldsolution;
-};
-typedef struct variable_info *varinfo_t;
-
-static varinfo_t first_vi_for_offset (varinfo_t, unsigned HOST_WIDE_INT);
-static varinfo_t first_or_preceding_vi_for_offset (varinfo_t,
- unsigned HOST_WIDE_INT);
-static varinfo_t lookup_vi_for_tree (tree);
-static inline bool type_can_have_subvars (const_tree);
-static void make_param_constraints (varinfo_t);
-
-/* Pool of variable info structures. */
-static object_allocator<variable_info> variable_info_pool
- ("Variable info pool");
-
-/* Map varinfo to final pt_solution. */
-static hash_map<varinfo_t, pt_solution *> *final_solutions;
-struct obstack final_solutions_obstack;
-
-/* Table of variable info structures for constraint variables.
- Indexed directly by variable info id. */
-static vec<varinfo_t> varmap;
-
-/* Return the varmap element N */
-
-static inline varinfo_t
-get_varinfo (unsigned int n)
-{
- return varmap[n];
-}
-
-/* Return the next variable in the list of sub-variables of VI
- or NULL if VI is the last sub-variable. */
-
-static inline varinfo_t
-vi_next (varinfo_t vi)
-{
- return get_varinfo (vi->next);
-}
-
-/* Static IDs for the special variables. Variable ID zero is unused
- and used as terminator for the sub-variable chain. */
-enum { nothing_id = 1, anything_id = 2, string_id = 3,
- escaped_id = 4, nonlocal_id = 5,
- storedanything_id = 6, integer_id = 7 };
-
-/* Return a new variable info structure consisting for a variable
- named NAME, and using constraint graph node NODE. Append it
- to the vector of variable info structures. */
-
-static varinfo_t
-new_var_info (tree t, const char *name, bool add_id)
-{
- unsigned index = varmap.length ();
- varinfo_t ret = variable_info_pool.allocate ();
-
- if (dump_file && add_id)
- {
- char *tempname = xasprintf ("%s(%d)", name, index);
- name = ggc_strdup (tempname);
- free (tempname);
- }
-
- ret->id = index;
- ret->name = name;
- ret->decl = t;
- /* Vars without decl are artificial and do not have sub-variables. */
- ret->is_artificial_var = (t == NULL_TREE);
- ret->is_special_var = false;
- ret->is_unknown_size_var = false;
- ret->is_full_var = (t == NULL_TREE);
- ret->is_heap_var = false;
- ret->may_have_pointers = true;
- ret->only_restrict_pointers = false;
- ret->is_restrict_var = false;
- ret->ruid = 0;
- ret->is_global_var = (t == NULL_TREE);
- ret->is_ipa_escape_point = false;
- ret->is_fn_info = false;
- ret->address_taken = false;
- if (t && DECL_P (t))
- ret->is_global_var = (is_global_var (t)
- /* We have to treat even local register variables
- as escape points. */
- || (VAR_P (t) && DECL_HARD_REGISTER (t)));
- ret->is_reg_var = (t && TREE_CODE (t) == SSA_NAME);
- ret->solution = BITMAP_ALLOC (&pta_obstack);
- ret->oldsolution = NULL;
- ret->next = 0;
- ret->shadow_var_uid = 0;
- ret->head = ret->id;
-
- stats.total_vars++;
-
- varmap.safe_push (ret);
-
- return ret;
-}
-
-/* A map mapping call statements to per-stmt variables for uses
- and clobbers specific to the call. */
-static hash_map<gimple *, varinfo_t> *call_stmt_vars;
-
-/* Lookup or create the variable for the call statement CALL. */
-
-static varinfo_t
-get_call_vi (gcall *call)
-{
- varinfo_t vi, vi2;
-
- bool existed;
- varinfo_t *slot_p = &call_stmt_vars->get_or_insert (call, &existed);
- if (existed)
- return *slot_p;
-
- vi = new_var_info (NULL_TREE, "CALLUSED", true);
- vi->offset = 0;
- vi->size = 1;
- vi->fullsize = 2;
- vi->is_full_var = true;
- vi->is_reg_var = true;
-
- vi2 = new_var_info (NULL_TREE, "CALLCLOBBERED", true);
- vi2->offset = 1;
- vi2->size = 1;
- vi2->fullsize = 2;
- vi2->is_full_var = true;
- vi2->is_reg_var = true;
-
- vi->next = vi2->id;
-
- *slot_p = vi;
- return vi;
-}
-
-/* Lookup the variable for the call statement CALL representing
- the uses. Returns NULL if there is nothing special about this call. */
-
-static varinfo_t
-lookup_call_use_vi (gcall *call)
-{
- varinfo_t *slot_p = call_stmt_vars->get (call);
- if (slot_p)
- return *slot_p;
-
- return NULL;
-}
-
-/* Lookup the variable for the call statement CALL representing
- the clobbers. Returns NULL if there is nothing special about this call. */
-
-static varinfo_t
-lookup_call_clobber_vi (gcall *call)
-{
- varinfo_t uses = lookup_call_use_vi (call);
- if (!uses)
- return NULL;
-
- return vi_next (uses);
-}
-
-/* Lookup or create the variable for the call statement CALL representing
- the uses. */
-
-static varinfo_t
-get_call_use_vi (gcall *call)
-{
- return get_call_vi (call);
-}
-
-/* Lookup or create the variable for the call statement CALL representing
- the clobbers. */
-
-static varinfo_t ATTRIBUTE_UNUSED
-get_call_clobber_vi (gcall *call)
-{
- return vi_next (get_call_vi (call));
-}
-
-
-enum constraint_expr_type {SCALAR, DEREF, ADDRESSOF};
-
-/* An expression that appears in a constraint. */
-
-struct constraint_expr
-{
- /* Constraint type. */
- constraint_expr_type type;
-
- /* Variable we are referring to in the constraint. */
- unsigned int var;
-
- /* Offset, in bits, of this constraint from the beginning of
- variables it ends up referring to.
-
- IOW, in a deref constraint, we would deref, get the result set,
- then add OFFSET to each member. */
- HOST_WIDE_INT offset;
-};
-
-/* Use 0x8000... as special unknown offset. */
-#define UNKNOWN_OFFSET HOST_WIDE_INT_MIN
-
-typedef struct constraint_expr ce_s;
-static void get_constraint_for_1 (tree, vec<ce_s> *, bool, bool);
-static void get_constraint_for (tree, vec<ce_s> *);
-static void get_constraint_for_rhs (tree, vec<ce_s> *);
-static void do_deref (vec<ce_s> *);
-
-/* Our set constraints are made up of two constraint expressions, one
- LHS, and one RHS.
-
- As described in the introduction, our set constraints each represent an
- operation between set valued variables.
-*/
-struct constraint
-{
- struct constraint_expr lhs;
- struct constraint_expr rhs;
-};
-
-/* List of constraints that we use to build the constraint graph from. */
-
-static vec<constraint_t> constraints;
-static object_allocator<constraint> constraint_pool ("Constraint pool");
-
-/* The constraint graph is represented as an array of bitmaps
- containing successor nodes. */
-
-struct constraint_graph
-{
- /* Size of this graph, which may be different than the number of
- nodes in the variable map. */
- unsigned int size;
-
- /* Explicit successors of each node. */
- bitmap *succs;
-
- /* Implicit predecessors of each node (Used for variable
- substitution). */
- bitmap *implicit_preds;
-
- /* Explicit predecessors of each node (Used for variable substitution). */
- bitmap *preds;
-
- /* Indirect cycle representatives, or -1 if the node has no indirect
- cycles. */
- int *indirect_cycles;
-
- /* Representative node for a node. rep[a] == a unless the node has
- been unified. */
- unsigned int *rep;
-
- /* Equivalence class representative for a label. This is used for
- variable substitution. */
- int *eq_rep;
-
- /* Pointer equivalence label for a node. All nodes with the same
- pointer equivalence label can be unified together at some point
- (either during constraint optimization or after the constraint
- graph is built). */
- unsigned int *pe;
-
- /* Pointer equivalence representative for a label. This is used to
- handle nodes that are pointer equivalent but not location
- equivalent. We can unite these once the addressof constraints
- are transformed into initial points-to sets. */
- int *pe_rep;
-
- /* Pointer equivalence label for each node, used during variable
- substitution. */
- unsigned int *pointer_label;
-
- /* Location equivalence label for each node, used during location
- equivalence finding. */
- unsigned int *loc_label;
-
- /* Pointed-by set for each node, used during location equivalence
- finding. This is pointed-by rather than pointed-to, because it
- is constructed using the predecessor graph. */
- bitmap *pointed_by;
-
- /* Points to sets for pointer equivalence. This is *not* the actual
- points-to sets for nodes. */
- bitmap *points_to;
-
- /* Bitmap of nodes where the bit is set if the node is a direct
- node. Used for variable substitution. */
- sbitmap direct_nodes;
-
- /* Bitmap of nodes where the bit is set if the node is address
- taken. Used for variable substitution. */
- bitmap address_taken;
-
- /* Vector of complex constraints for each graph node. Complex
- constraints are those involving dereferences or offsets that are
- not 0. */
- vec<constraint_t> *complex;
-};
-
-static constraint_graph_t graph;
-
-/* During variable substitution and the offline version of indirect
- cycle finding, we create nodes to represent dereferences and
- address taken constraints. These represent where these start and
- end. */
-#define FIRST_REF_NODE (varmap).length ()
-#define LAST_REF_NODE (FIRST_REF_NODE + (FIRST_REF_NODE - 1))
-
-/* Return the representative node for NODE, if NODE has been unioned
- with another NODE.
- This function performs path compression along the way to finding
- the representative. */
-
-static unsigned int
-find (unsigned int node)
-{
- gcc_checking_assert (node < graph->size);
- if (graph->rep[node] != node)
- return graph->rep[node] = find (graph->rep[node]);
- return node;
-}
-
-/* Union the TO and FROM nodes to the TO nodes.
- Note that at some point in the future, we may want to do
- union-by-rank, in which case we are going to have to return the
- node we unified to. */
-
-static bool
-unite (unsigned int to, unsigned int from)
-{
- gcc_checking_assert (to < graph->size && from < graph->size);
- if (to != from && graph->rep[from] != to)
- {
- graph->rep[from] = to;
- return true;
- }
- return false;
-}
-
-/* Create a new constraint consisting of LHS and RHS expressions. */
-
-static constraint_t
-new_constraint (const struct constraint_expr lhs,
- const struct constraint_expr rhs)
-{
- constraint_t ret = constraint_pool.allocate ();
- ret->lhs = lhs;
- ret->rhs = rhs;
- return ret;
-}
-
-/* Print out constraint C to FILE. */
-
-static void
-dump_constraint (FILE *file, constraint_t c)
-{
- if (c->lhs.type == ADDRESSOF)
- fprintf (file, "&");
- else if (c->lhs.type == DEREF)
- fprintf (file, "*");
- if (dump_file)
- fprintf (file, "%s", get_varinfo (c->lhs.var)->name);
- else
- fprintf (file, "V%d", c->lhs.var);
- if (c->lhs.offset == UNKNOWN_OFFSET)
- fprintf (file, " + UNKNOWN");
- else if (c->lhs.offset != 0)
- fprintf (file, " + " HOST_WIDE_INT_PRINT_DEC, c->lhs.offset);
- fprintf (file, " = ");
- if (c->rhs.type == ADDRESSOF)
- fprintf (file, "&");
- else if (c->rhs.type == DEREF)
- fprintf (file, "*");
- if (dump_file)
- fprintf (file, "%s", get_varinfo (c->rhs.var)->name);
- else
- fprintf (file, "V%d", c->rhs.var);
- if (c->rhs.offset == UNKNOWN_OFFSET)
- fprintf (file, " + UNKNOWN");
- else if (c->rhs.offset != 0)
- fprintf (file, " + " HOST_WIDE_INT_PRINT_DEC, c->rhs.offset);
-}
-
-
-void debug_constraint (constraint_t);
-void debug_constraints (void);
-void debug_constraint_graph (void);
-void debug_solution_for_var (unsigned int);
-void debug_sa_points_to_info (void);
-void debug_varinfo (varinfo_t);
-void debug_varmap (void);
-
-/* Print out constraint C to stderr. */
-
-DEBUG_FUNCTION void
-debug_constraint (constraint_t c)
-{
- dump_constraint (stderr, c);
- fprintf (stderr, "\n");
-}
-
-/* Print out all constraints to FILE */
-
-static void
-dump_constraints (FILE *file, int from)
-{
- int i;
- constraint_t c;
- for (i = from; constraints.iterate (i, &c); i++)
- if (c)
- {
- dump_constraint (file, c);
- fprintf (file, "\n");
- }
-}
-
-/* Print out all constraints to stderr. */
-
-DEBUG_FUNCTION void
-debug_constraints (void)
-{
- dump_constraints (stderr, 0);
-}
-
-/* Print the constraint graph in dot format. */
-
-static void
-dump_constraint_graph (FILE *file)
-{
- unsigned int i;
-
- /* Only print the graph if it has already been initialized: */
- if (!graph)
- return;
-
- /* Prints the header of the dot file: */
- fprintf (file, "strict digraph {\n");
- fprintf (file, " node [\n shape = box\n ]\n");
- fprintf (file, " edge [\n fontsize = \"12\"\n ]\n");
- fprintf (file, "\n // List of nodes and complex constraints in "
- "the constraint graph:\n");
-
- /* The next lines print the nodes in the graph together with the
- complex constraints attached to them. */
- for (i = 1; i < graph->size; i++)
- {
- if (i == FIRST_REF_NODE)
- continue;
- if (find (i) != i)
- continue;
- if (i < FIRST_REF_NODE)
- fprintf (file, "\"%s\"", get_varinfo (i)->name);
- else
- fprintf (file, "\"*%s\"", get_varinfo (i - FIRST_REF_NODE)->name);
- if (graph->complex[i].exists ())
- {
- unsigned j;
- constraint_t c;
- fprintf (file, " [label=\"\\N\\n");
- for (j = 0; graph->complex[i].iterate (j, &c); ++j)
- {
- dump_constraint (file, c);
- fprintf (file, "\\l");
- }
- fprintf (file, "\"]");
- }
- fprintf (file, ";\n");
- }
-
- /* Go over the edges. */
- fprintf (file, "\n // Edges in the constraint graph:\n");
- for (i = 1; i < graph->size; i++)
- {
- unsigned j;
- bitmap_iterator bi;
- if (find (i) != i)
- continue;
- EXECUTE_IF_IN_NONNULL_BITMAP (graph->succs[i], 0, j, bi)
- {
- unsigned to = find (j);
- if (i == to)
- continue;
- if (i < FIRST_REF_NODE)
- fprintf (file, "\"%s\"", get_varinfo (i)->name);
- else
- fprintf (file, "\"*%s\"", get_varinfo (i - FIRST_REF_NODE)->name);
- fprintf (file, " -> ");
- if (to < FIRST_REF_NODE)
- fprintf (file, "\"%s\"", get_varinfo (to)->name);
- else
- fprintf (file, "\"*%s\"", get_varinfo (to - FIRST_REF_NODE)->name);
- fprintf (file, ";\n");
- }
- }
-
- /* Prints the tail of the dot file. */
- fprintf (file, "}\n");
-}
-
-/* Print out the constraint graph to stderr. */
-
-DEBUG_FUNCTION void
-debug_constraint_graph (void)
-{
- dump_constraint_graph (stderr);
-}
-
-/* SOLVER FUNCTIONS
-
- The solver is a simple worklist solver, that works on the following
- algorithm:
-
- sbitmap changed_nodes = all zeroes;
- changed_count = 0;
- For each node that is not already collapsed:
- changed_count++;
- set bit in changed nodes
-
- while (changed_count > 0)
- {
- compute topological ordering for constraint graph
-
- find and collapse cycles in the constraint graph (updating
- changed if necessary)
-
- for each node (n) in the graph in topological order:
- changed_count--;
-
- Process each complex constraint associated with the node,
- updating changed if necessary.
-
- For each outgoing edge from n, propagate the solution from n to
- the destination of the edge, updating changed as necessary.
-
- } */
-
-/* Return true if two constraint expressions A and B are equal. */
-
-static bool
-constraint_expr_equal (struct constraint_expr a, struct constraint_expr b)
-{
- return a.type == b.type && a.var == b.var && a.offset == b.offset;
-}
-
-/* Return true if constraint expression A is less than constraint expression
- B. This is just arbitrary, but consistent, in order to give them an
- ordering. */
-
-static bool
-constraint_expr_less (struct constraint_expr a, struct constraint_expr b)
-{
- if (a.type == b.type)
- {
- if (a.var == b.var)
- return a.offset < b.offset;
- else
- return a.var < b.var;
- }
- else
- return a.type < b.type;
-}
-
-/* Return true if constraint A is less than constraint B. This is just
- arbitrary, but consistent, in order to give them an ordering. */
-
-static bool
-constraint_less (const constraint_t &a, const constraint_t &b)
-{
- if (constraint_expr_less (a->lhs, b->lhs))
- return true;
- else if (constraint_expr_less (b->lhs, a->lhs))
- return false;
- else
- return constraint_expr_less (a->rhs, b->rhs);
-}
-
-/* Return true if two constraints A and B are equal. */
-
-static bool
-constraint_equal (struct constraint a, struct constraint b)
-{
- return constraint_expr_equal (a.lhs, b.lhs)
- && constraint_expr_equal (a.rhs, b.rhs);
-}
-
-
-/* Find a constraint LOOKFOR in the sorted constraint vector VEC */
-
-static constraint_t
-constraint_vec_find (vec<constraint_t> vec,
- struct constraint lookfor)
-{
- unsigned int place;
- constraint_t found;
-
- if (!vec.exists ())
- return NULL;
-
- place = vec.lower_bound (&lookfor, constraint_less);
- if (place >= vec.length ())
- return NULL;
- found = vec[place];
- if (!constraint_equal (*found, lookfor))
- return NULL;
- return found;
-}
-
-/* Union two constraint vectors, TO and FROM. Put the result in TO.
- Returns true of TO set is changed. */
-
-static bool
-constraint_set_union (vec<constraint_t> *to,
- vec<constraint_t> *from)
-{
- int i;
- constraint_t c;
- bool any_change = false;
-
- FOR_EACH_VEC_ELT (*from, i, c)
- {
- if (constraint_vec_find (*to, *c) == NULL)
- {
- unsigned int place = to->lower_bound (c, constraint_less);
- to->safe_insert (place, c);
- any_change = true;
- }
- }
- return any_change;
-}
-
-/* Expands the solution in SET to all sub-fields of variables included. */
-
-static bitmap
-solution_set_expand (bitmap set, bitmap *expanded)
-{
- bitmap_iterator bi;
- unsigned j;
-
- if (*expanded)
- return *expanded;
-
- *expanded = BITMAP_ALLOC (&iteration_obstack);
-
- /* In a first pass expand to the head of the variables we need to
- add all sub-fields off. This avoids quadratic behavior. */
- EXECUTE_IF_SET_IN_BITMAP (set, 0, j, bi)
- {
- varinfo_t v = get_varinfo (j);
- if (v->is_artificial_var
- || v->is_full_var)
- continue;
- bitmap_set_bit (*expanded, v->head);
- }
-
- /* In the second pass now expand all head variables with subfields. */
- EXECUTE_IF_SET_IN_BITMAP (*expanded, 0, j, bi)
- {
- varinfo_t v = get_varinfo (j);
- if (v->head != j)
- continue;
- for (v = vi_next (v); v != NULL; v = vi_next (v))
- bitmap_set_bit (*expanded, v->id);
- }
-
- /* And finally set the rest of the bits from SET. */
- bitmap_ior_into (*expanded, set);
-
- return *expanded;
-}
-
-/* Union solution sets TO and DELTA, and add INC to each member of DELTA in the
- process. */
-
-static bool
-set_union_with_increment (bitmap to, bitmap delta, HOST_WIDE_INT inc,
- bitmap *expanded_delta)
-{
- bool changed = false;
- bitmap_iterator bi;
- unsigned int i;
-
- /* If the solution of DELTA contains anything it is good enough to transfer
- this to TO. */
- if (bitmap_bit_p (delta, anything_id))
- return bitmap_set_bit (to, anything_id);
-
- /* If the offset is unknown we have to expand the solution to
- all subfields. */
- if (inc == UNKNOWN_OFFSET)
- {
- delta = solution_set_expand (delta, expanded_delta);
- changed |= bitmap_ior_into (to, delta);
- return changed;
- }
-
- /* For non-zero offset union the offsetted solution into the destination. */
- EXECUTE_IF_SET_IN_BITMAP (delta, 0, i, bi)
- {
- varinfo_t vi = get_varinfo (i);
-
- /* If this is a variable with just one field just set its bit
- in the result. */
- if (vi->is_artificial_var
- || vi->is_unknown_size_var
- || vi->is_full_var)
- changed |= bitmap_set_bit (to, i);
- else
- {
- HOST_WIDE_INT fieldoffset = vi->offset + inc;
- unsigned HOST_WIDE_INT size = vi->size;
-
- /* If the offset makes the pointer point to before the
- variable use offset zero for the field lookup. */
- if (fieldoffset < 0)
- vi = get_varinfo (vi->head);
- else
- vi = first_or_preceding_vi_for_offset (vi, fieldoffset);
-
- do
- {
- changed |= bitmap_set_bit (to, vi->id);
- if (vi->is_full_var
- || vi->next == 0)
- break;
-
- /* We have to include all fields that overlap the current field
- shifted by inc. */
- vi = vi_next (vi);
- }
- while (vi->offset < fieldoffset + size);
- }
- }
-
- return changed;
-}
-
-/* Insert constraint C into the list of complex constraints for graph
- node VAR. */
-
-static void
-insert_into_complex (constraint_graph_t graph,
- unsigned int var, constraint_t c)
-{
- vec<constraint_t> complex = graph->complex[var];
- unsigned int place = complex.lower_bound (c, constraint_less);
-
- /* Only insert constraints that do not already exist. */
- if (place >= complex.length ()
- || !constraint_equal (*c, *complex[place]))
- graph->complex[var].safe_insert (place, c);
-}
-
-
-/* Condense two variable nodes into a single variable node, by moving
- all associated info from FROM to TO. Returns true if TO node's
- constraint set changes after the merge. */
-
-static bool
-merge_node_constraints (constraint_graph_t graph, unsigned int to,
- unsigned int from)
-{
- unsigned int i;
- constraint_t c;
- bool any_change = false;
-
- gcc_checking_assert (find (from) == to);
-
- /* Move all complex constraints from src node into to node */
- FOR_EACH_VEC_ELT (graph->complex[from], i, c)
- {
- /* In complex constraints for node FROM, we may have either
- a = *FROM, and *FROM = a, or an offseted constraint which are
- always added to the rhs node's constraints. */
-
- if (c->rhs.type == DEREF)
- c->rhs.var = to;
- else if (c->lhs.type == DEREF)
- c->lhs.var = to;
- else
- c->rhs.var = to;
-
- }
- any_change = constraint_set_union (&graph->complex[to],
- &graph->complex[from]);
- graph->complex[from].release ();
- return any_change;
-}
-
-
-/* Remove edges involving NODE from GRAPH. */
-
-static void
-clear_edges_for_node (constraint_graph_t graph, unsigned int node)
-{
- if (graph->succs[node])
- BITMAP_FREE (graph->succs[node]);
-}
-
-/* Merge GRAPH nodes FROM and TO into node TO. */
-
-static void
-merge_graph_nodes (constraint_graph_t graph, unsigned int to,
- unsigned int from)
-{
- if (graph->indirect_cycles[from] != -1)
- {
- /* If we have indirect cycles with the from node, and we have
- none on the to node, the to node has indirect cycles from the
- from node now that they are unified.
- If indirect cycles exist on both, unify the nodes that they
- are in a cycle with, since we know they are in a cycle with
- each other. */
- if (graph->indirect_cycles[to] == -1)
- graph->indirect_cycles[to] = graph->indirect_cycles[from];
- }
-
- /* Merge all the successor edges. */
- if (graph->succs[from])
- {
- if (!graph->succs[to])
- graph->succs[to] = BITMAP_ALLOC (&pta_obstack);
- bitmap_ior_into (graph->succs[to],
- graph->succs[from]);
- }
-
- clear_edges_for_node (graph, from);
-}
-
-
-/* Add an indirect graph edge to GRAPH, going from TO to FROM if
- it doesn't exist in the graph already. */
-
-static void
-add_implicit_graph_edge (constraint_graph_t graph, unsigned int to,
- unsigned int from)
-{
- if (to == from)
- return;
-
- if (!graph->implicit_preds[to])
- graph->implicit_preds[to] = BITMAP_ALLOC (&predbitmap_obstack);
-
- if (bitmap_set_bit (graph->implicit_preds[to], from))
- stats.num_implicit_edges++;
-}
-
-/* Add a predecessor graph edge to GRAPH, going from TO to FROM if
- it doesn't exist in the graph already.
- Return false if the edge already existed, true otherwise. */
-
-static void
-add_pred_graph_edge (constraint_graph_t graph, unsigned int to,
- unsigned int from)
-{
- if (!graph->preds[to])
- graph->preds[to] = BITMAP_ALLOC (&predbitmap_obstack);
- bitmap_set_bit (graph->preds[to], from);
-}
-
-/* Add a graph edge to GRAPH, going from FROM to TO if
- it doesn't exist in the graph already.
- Return false if the edge already existed, true otherwise. */
-
-static bool
-add_graph_edge (constraint_graph_t graph, unsigned int to,
- unsigned int from)
-{
- if (to == from)
- {
- return false;
- }
- else
- {
- bool r = false;
-
- if (!graph->succs[from])
- graph->succs[from] = BITMAP_ALLOC (&pta_obstack);
-
- /* The graph solving process does not avoid "triangles", thus
- there can be multiple paths from a node to another involving
- intermediate other nodes. That causes extra copying which is
- most difficult to avoid when the intermediate node is ESCAPED
- because there are no edges added from ESCAPED. Avoid
- adding the direct edge FROM -> TO when we have FROM -> ESCAPED
- and TO contains ESCAPED.
- ??? Note this is only a heuristic, it does not prevent the
- situation from occuring. The heuristic helps PR38474 and
- PR99912 significantly. */
- if (to < FIRST_REF_NODE
- && bitmap_bit_p (graph->succs[from], find (escaped_id))
- && bitmap_bit_p (get_varinfo (find (to))->solution, escaped_id))
- return false;
-
- if (bitmap_set_bit (graph->succs[from], to))
- {
- r = true;
- if (to < FIRST_REF_NODE && from < FIRST_REF_NODE)
- stats.num_edges++;
- }
- return r;
- }
-}
-
-
-/* Initialize the constraint graph structure to contain SIZE nodes. */
-
-static void
-init_graph (unsigned int size)
-{
- unsigned int j;
-
- graph = XCNEW (struct constraint_graph);
- graph->size = size;
- graph->succs = XCNEWVEC (bitmap, graph->size);
- graph->indirect_cycles = XNEWVEC (int, graph->size);
- graph->rep = XNEWVEC (unsigned int, graph->size);
- /* ??? Macros do not support template types with multiple arguments,
- so we use a typedef to work around it. */
- typedef vec<constraint_t> vec_constraint_t_heap;
- graph->complex = XCNEWVEC (vec_constraint_t_heap, size);
- graph->pe = XCNEWVEC (unsigned int, graph->size);
- graph->pe_rep = XNEWVEC (int, graph->size);
-
- for (j = 0; j < graph->size; j++)
- {
- graph->rep[j] = j;
- graph->pe_rep[j] = -1;
- graph->indirect_cycles[j] = -1;
- }
-}
-
-/* Build the constraint graph, adding only predecessor edges right now. */
-
-static void
-build_pred_graph (void)
-{
- int i;
- constraint_t c;
- unsigned int j;
-
- graph->implicit_preds = XCNEWVEC (bitmap, graph->size);
- graph->preds = XCNEWVEC (bitmap, graph->size);
- graph->pointer_label = XCNEWVEC (unsigned int, graph->size);
- graph->loc_label = XCNEWVEC (unsigned int, graph->size);
- graph->pointed_by = XCNEWVEC (bitmap, graph->size);
- graph->points_to = XCNEWVEC (bitmap, graph->size);
- graph->eq_rep = XNEWVEC (int, graph->size);
- graph->direct_nodes = sbitmap_alloc (graph->size);
- graph->address_taken = BITMAP_ALLOC (&predbitmap_obstack);
- bitmap_clear (graph->direct_nodes);
-
- for (j = 1; j < FIRST_REF_NODE; j++)
- {
- if (!get_varinfo (j)->is_special_var)
- bitmap_set_bit (graph->direct_nodes, j);
- }
-
- for (j = 0; j < graph->size; j++)
- graph->eq_rep[j] = -1;
-
- for (j = 0; j < varmap.length (); j++)
- graph->indirect_cycles[j] = -1;
-
- FOR_EACH_VEC_ELT (constraints, i, c)
- {
- struct constraint_expr lhs = c->lhs;
- struct constraint_expr rhs = c->rhs;
- unsigned int lhsvar = lhs.var;
- unsigned int rhsvar = rhs.var;
-
- if (lhs.type == DEREF)
- {
- /* *x = y. */
- if (rhs.offset == 0 && lhs.offset == 0 && rhs.type == SCALAR)
- add_pred_graph_edge (graph, FIRST_REF_NODE + lhsvar, rhsvar);
- }
- else if (rhs.type == DEREF)
- {
- /* x = *y */
- if (rhs.offset == 0 && lhs.offset == 0 && lhs.type == SCALAR)
- add_pred_graph_edge (graph, lhsvar, FIRST_REF_NODE + rhsvar);
- else
- bitmap_clear_bit (graph->direct_nodes, lhsvar);
- }
- else if (rhs.type == ADDRESSOF)
- {
- varinfo_t v;
-
- /* x = &y */
- if (graph->points_to[lhsvar] == NULL)
- graph->points_to[lhsvar] = BITMAP_ALLOC (&predbitmap_obstack);
- bitmap_set_bit (graph->points_to[lhsvar], rhsvar);
-
- if (graph->pointed_by[rhsvar] == NULL)
- graph->pointed_by[rhsvar] = BITMAP_ALLOC (&predbitmap_obstack);
- bitmap_set_bit (graph->pointed_by[rhsvar], lhsvar);
-
- /* Implicitly, *x = y */
- add_implicit_graph_edge (graph, FIRST_REF_NODE + lhsvar, rhsvar);
-
- /* All related variables are no longer direct nodes. */
- bitmap_clear_bit (graph->direct_nodes, rhsvar);
- v = get_varinfo (rhsvar);
- if (!v->is_full_var)
- {
- v = get_varinfo (v->head);
- do
- {
- bitmap_clear_bit (graph->direct_nodes, v->id);
- v = vi_next (v);
- }
- while (v != NULL);
- }
- bitmap_set_bit (graph->address_taken, rhsvar);
- }
- else if (lhsvar > anything_id
- && lhsvar != rhsvar && lhs.offset == 0 && rhs.offset == 0)
- {
- /* x = y */
- add_pred_graph_edge (graph, lhsvar, rhsvar);
- /* Implicitly, *x = *y */
- add_implicit_graph_edge (graph, FIRST_REF_NODE + lhsvar,
- FIRST_REF_NODE + rhsvar);
- }
- else if (lhs.offset != 0 || rhs.offset != 0)
- {
- if (rhs.offset != 0)
- bitmap_clear_bit (graph->direct_nodes, lhs.var);
- else if (lhs.offset != 0)
- bitmap_clear_bit (graph->direct_nodes, rhs.var);
- }
- }
-}
-
-/* Build the constraint graph, adding successor edges. */
-
-static void
-build_succ_graph (void)
-{
- unsigned i, t;
- constraint_t c;
-
- FOR_EACH_VEC_ELT (constraints, i, c)
- {
- struct constraint_expr lhs;
- struct constraint_expr rhs;
- unsigned int lhsvar;
- unsigned int rhsvar;
-
- if (!c)
- continue;
-
- lhs = c->lhs;
- rhs = c->rhs;
- lhsvar = find (lhs.var);
- rhsvar = find (rhs.var);
-
- if (lhs.type == DEREF)
- {
- if (rhs.offset == 0 && lhs.offset == 0 && rhs.type == SCALAR)
- add_graph_edge (graph, FIRST_REF_NODE + lhsvar, rhsvar);
- }
- else if (rhs.type == DEREF)
- {
- if (rhs.offset == 0 && lhs.offset == 0 && lhs.type == SCALAR)
- add_graph_edge (graph, lhsvar, FIRST_REF_NODE + rhsvar);
- }
- else if (rhs.type == ADDRESSOF)
- {
- /* x = &y */
- gcc_checking_assert (find (rhs.var) == rhs.var);
- bitmap_set_bit (get_varinfo (lhsvar)->solution, rhsvar);
- }
- else if (lhsvar > anything_id
- && lhsvar != rhsvar && lhs.offset == 0 && rhs.offset == 0)
- {
- add_graph_edge (graph, lhsvar, rhsvar);
- }
- }
-
- /* Add edges from STOREDANYTHING to all non-direct nodes that can
- receive pointers. */
- t = find (storedanything_id);
- for (i = integer_id + 1; i < FIRST_REF_NODE; ++i)
- {
- if (!bitmap_bit_p (graph->direct_nodes, i)
- && get_varinfo (i)->may_have_pointers)
- add_graph_edge (graph, find (i), t);
- }
-
- /* Everything stored to ANYTHING also potentially escapes. */
- add_graph_edge (graph, find (escaped_id), t);
-}
-
-
-/* Changed variables on the last iteration. */
-static bitmap changed;
-
-/* Strongly Connected Component visitation info. */
-
-class scc_info
-{
-public:
- scc_info (size_t size);
- ~scc_info ();
-
- auto_sbitmap visited;
- auto_sbitmap deleted;
- unsigned int *dfs;
- unsigned int *node_mapping;
- int current_index;
- auto_vec<unsigned> scc_stack;
-};
-
-
-/* Recursive routine to find strongly connected components in GRAPH.
- SI is the SCC info to store the information in, and N is the id of current
- graph node we are processing.
-
- This is Tarjan's strongly connected component finding algorithm, as
- modified by Nuutila to keep only non-root nodes on the stack.
- The algorithm can be found in "On finding the strongly connected
- connected components in a directed graph" by Esko Nuutila and Eljas
- Soisalon-Soininen, in Information Processing Letters volume 49,
- number 1, pages 9-14. */
-
-static void
-scc_visit (constraint_graph_t graph, class scc_info *si, unsigned int n)
-{
- unsigned int i;
- bitmap_iterator bi;
- unsigned int my_dfs;
-
- bitmap_set_bit (si->visited, n);
- si->dfs[n] = si->current_index ++;
- my_dfs = si->dfs[n];
-
- /* Visit all the successors. */
- EXECUTE_IF_IN_NONNULL_BITMAP (graph->succs[n], 0, i, bi)
- {
- unsigned int w;
-
- if (i > LAST_REF_NODE)
- break;
-
- w = find (i);
- if (bitmap_bit_p (si->deleted, w))
- continue;
-
- if (!bitmap_bit_p (si->visited, w))
- scc_visit (graph, si, w);
-
- unsigned int t = find (w);
- gcc_checking_assert (find (n) == n);
- if (si->dfs[t] < si->dfs[n])
- si->dfs[n] = si->dfs[t];
- }
-
- /* See if any components have been identified. */
- if (si->dfs[n] == my_dfs)
- {
- if (si->scc_stack.length () > 0
- && si->dfs[si->scc_stack.last ()] >= my_dfs)
- {
- bitmap scc = BITMAP_ALLOC (NULL);
- unsigned int lowest_node;
- bitmap_iterator bi;
-
- bitmap_set_bit (scc, n);
-
- while (si->scc_stack.length () != 0
- && si->dfs[si->scc_stack.last ()] >= my_dfs)
- {
- unsigned int w = si->scc_stack.pop ();
-
- bitmap_set_bit (scc, w);
- }
-
- lowest_node = bitmap_first_set_bit (scc);
- gcc_assert (lowest_node < FIRST_REF_NODE);
-
- /* Collapse the SCC nodes into a single node, and mark the
- indirect cycles. */
- EXECUTE_IF_SET_IN_BITMAP (scc, 0, i, bi)
- {
- if (i < FIRST_REF_NODE)
- {
- if (unite (lowest_node, i))
- unify_nodes (graph, lowest_node, i, false);
- }
- else
- {
- unite (lowest_node, i);
- graph->indirect_cycles[i - FIRST_REF_NODE] = lowest_node;
- }
- }
- }
- bitmap_set_bit (si->deleted, n);
- }
- else
- si->scc_stack.safe_push (n);
-}
-
-/* Unify node FROM into node TO, updating the changed count if
- necessary when UPDATE_CHANGED is true. */
-
-static void
-unify_nodes (constraint_graph_t graph, unsigned int to, unsigned int from,
- bool update_changed)
-{
- gcc_checking_assert (to != from && find (to) == to);
-
- if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, "Unifying %s to %s\n",
- get_varinfo (from)->name,
- get_varinfo (to)->name);
-
- if (update_changed)
- stats.unified_vars_dynamic++;
- else
- stats.unified_vars_static++;
-
- merge_graph_nodes (graph, to, from);
- if (merge_node_constraints (graph, to, from))
- {
- if (update_changed)
- bitmap_set_bit (changed, to);
- }
-
- /* Mark TO as changed if FROM was changed. If TO was already marked
- as changed, decrease the changed count. */
-
- if (update_changed
- && bitmap_clear_bit (changed, from))
- bitmap_set_bit (changed, to);
- varinfo_t fromvi = get_varinfo (from);
- if (fromvi->solution)
- {
- /* If the solution changes because of the merging, we need to mark
- the variable as changed. */
- varinfo_t tovi = get_varinfo (to);
- if (bitmap_ior_into (tovi->solution, fromvi->solution))
- {
- if (update_changed)
- bitmap_set_bit (changed, to);
- }
-
- BITMAP_FREE (fromvi->solution);
- if (fromvi->oldsolution)
- BITMAP_FREE (fromvi->oldsolution);
-
- if (stats.iterations > 0
- && tovi->oldsolution)
- BITMAP_FREE (tovi->oldsolution);
- }
- if (graph->succs[to])
- bitmap_clear_bit (graph->succs[to], to);
-}
-
-/* Information needed to compute the topological ordering of a graph. */
-
-struct topo_info
-{
- /* sbitmap of visited nodes. */
- sbitmap visited;
- /* Array that stores the topological order of the graph, *in
- reverse*. */
- vec<unsigned> topo_order;
-};
-
-
-/* Initialize and return a topological info structure. */
-
-static struct topo_info *
-init_topo_info (void)
-{
- size_t size = graph->size;
- struct topo_info *ti = XNEW (struct topo_info);
- ti->visited = sbitmap_alloc (size);
- bitmap_clear (ti->visited);
- ti->topo_order.create (1);
- return ti;
-}
-
-
-/* Free the topological sort info pointed to by TI. */
-
-static void
-free_topo_info (struct topo_info *ti)
-{
- sbitmap_free (ti->visited);
- ti->topo_order.release ();
- free (ti);
-}
-
-/* Visit the graph in topological order, and store the order in the
- topo_info structure. */
-
-static void
-topo_visit (constraint_graph_t graph, struct topo_info *ti,
- unsigned int n)
-{
- bitmap_iterator bi;
- unsigned int j;
-
- bitmap_set_bit (ti->visited, n);
-
- if (graph->succs[n])
- EXECUTE_IF_SET_IN_BITMAP (graph->succs[n], 0, j, bi)
- {
- if (!bitmap_bit_p (ti->visited, j))
- topo_visit (graph, ti, j);
- }
-
- ti->topo_order.safe_push (n);
-}
-
-/* Process a constraint C that represents x = *(y + off), using DELTA as the
- starting solution for y. */
-
-static void
-do_sd_constraint (constraint_graph_t graph, constraint_t c,
- bitmap delta, bitmap *expanded_delta)
-{
- unsigned int lhs = c->lhs.var;
- bool flag = false;
- bitmap sol = get_varinfo (lhs)->solution;
- unsigned int j;
- bitmap_iterator bi;
- HOST_WIDE_INT roffset = c->rhs.offset;
-
- /* Our IL does not allow this. */
- gcc_checking_assert (c->lhs.offset == 0);
-
- /* If the solution of Y contains anything it is good enough to transfer
- this to the LHS. */
- if (bitmap_bit_p (delta, anything_id))
- {
- flag |= bitmap_set_bit (sol, anything_id);
- goto done;
- }
-
- /* If we do not know at with offset the rhs is dereferenced compute
- the reachability set of DELTA, conservatively assuming it is
- dereferenced at all valid offsets. */
- if (roffset == UNKNOWN_OFFSET)
- {
- delta = solution_set_expand (delta, expanded_delta);
- /* No further offset processing is necessary. */
- roffset = 0;
- }
-
- /* For each variable j in delta (Sol(y)), add
- an edge in the graph from j to x, and union Sol(j) into Sol(x). */
- EXECUTE_IF_SET_IN_BITMAP (delta, 0, j, bi)
- {
- varinfo_t v = get_varinfo (j);
- HOST_WIDE_INT fieldoffset = v->offset + roffset;
- unsigned HOST_WIDE_INT size = v->size;
- unsigned int t;
-
- if (v->is_full_var)
- ;
- else if (roffset != 0)
- {
- if (fieldoffset < 0)
- v = get_varinfo (v->head);
- else
- v = first_or_preceding_vi_for_offset (v, fieldoffset);
- }
-
- /* We have to include all fields that overlap the current field
- shifted by roffset. */
- do
- {
- t = find (v->id);
-
- /* Adding edges from the special vars is pointless.
- They don't have sets that can change. */
- if (get_varinfo (t)->is_special_var)
- flag |= bitmap_ior_into (sol, get_varinfo (t)->solution);
- /* Merging the solution from ESCAPED needlessly increases
- the set. Use ESCAPED as representative instead. */
- else if (v->id == escaped_id)
- flag |= bitmap_set_bit (sol, escaped_id);
- else if (v->may_have_pointers
- && add_graph_edge (graph, lhs, t))
- flag |= bitmap_ior_into (sol, get_varinfo (t)->solution);
-
- if (v->is_full_var
- || v->next == 0)
- break;
-
- v = vi_next (v);
- }
- while (v->offset < fieldoffset + size);
- }
-
-done:
- /* If the LHS solution changed, mark the var as changed. */
- if (flag)
- {
- get_varinfo (lhs)->solution = sol;
- bitmap_set_bit (changed, lhs);
- }
-}
-
-/* Process a constraint C that represents *(x + off) = y using DELTA
- as the starting solution for x. */
-
-static void
-do_ds_constraint (constraint_t c, bitmap delta, bitmap *expanded_delta)
-{
- unsigned int rhs = c->rhs.var;
- bitmap sol = get_varinfo (rhs)->solution;
- unsigned int j;
- bitmap_iterator bi;
- HOST_WIDE_INT loff = c->lhs.offset;
- bool escaped_p = false;
-
- /* Our IL does not allow this. */
- gcc_checking_assert (c->rhs.offset == 0);
-
- /* If the solution of y contains ANYTHING simply use the ANYTHING
- solution. This avoids needlessly increasing the points-to sets. */
- if (bitmap_bit_p (sol, anything_id))
- sol = get_varinfo (find (anything_id))->solution;
-
- /* If the solution for x contains ANYTHING we have to merge the
- solution of y into all pointer variables which we do via
- STOREDANYTHING. */
- if (bitmap_bit_p (delta, anything_id))
- {
- unsigned t = find (storedanything_id);
- if (add_graph_edge (graph, t, rhs))
- {
- if (bitmap_ior_into (get_varinfo (t)->solution, sol))
- bitmap_set_bit (changed, t);
- }
- return;
- }
-
- /* If we do not know at with offset the rhs is dereferenced compute
- the reachability set of DELTA, conservatively assuming it is
- dereferenced at all valid offsets. */
- if (loff == UNKNOWN_OFFSET)
- {
- delta = solution_set_expand (delta, expanded_delta);
- loff = 0;
- }
-
- /* For each member j of delta (Sol(x)), add an edge from y to j and
- union Sol(y) into Sol(j) */
- EXECUTE_IF_SET_IN_BITMAP (delta, 0, j, bi)
- {
- varinfo_t v = get_varinfo (j);
- unsigned int t;
- HOST_WIDE_INT fieldoffset = v->offset + loff;
- unsigned HOST_WIDE_INT size = v->size;
-
- if (v->is_full_var)
- ;
- else if (loff != 0)
- {
- if (fieldoffset < 0)
- v = get_varinfo (v->head);
- else
- v = first_or_preceding_vi_for_offset (v, fieldoffset);
- }
-
- /* We have to include all fields that overlap the current field
- shifted by loff. */
- do
- {
- if (v->may_have_pointers)
- {
- /* If v is a global variable then this is an escape point. */
- if (v->is_global_var
- && !escaped_p)
- {
- t = find (escaped_id);
- if (add_graph_edge (graph, t, rhs)
- && bitmap_ior_into (get_varinfo (t)->solution, sol))
- bitmap_set_bit (changed, t);
- /* Enough to let rhs escape once. */
- escaped_p = true;
- }
-
- if (v->is_special_var)
- break;
-
- t = find (v->id);
- if (add_graph_edge (graph, t, rhs)
- && bitmap_ior_into (get_varinfo (t)->solution, sol))
- bitmap_set_bit (changed, t);
- }
-
- if (v->is_full_var
- || v->next == 0)
- break;
-
- v = vi_next (v);
- }
- while (v->offset < fieldoffset + size);
- }
-}
-
-/* Handle a non-simple (simple meaning requires no iteration),
- constraint (IE *x = &y, x = *y, *x = y, and x = y with offsets involved). */
-
-static void
-do_complex_constraint (constraint_graph_t graph, constraint_t c, bitmap delta,
- bitmap *expanded_delta)
-{
- if (c->lhs.type == DEREF)
- {
- if (c->rhs.type == ADDRESSOF)
- {
- gcc_unreachable ();
- }
- else
- {
- /* *x = y */
- do_ds_constraint (c, delta, expanded_delta);
- }
- }
- else if (c->rhs.type == DEREF)
- {
- /* x = *y */
- if (!(get_varinfo (c->lhs.var)->is_special_var))
- do_sd_constraint (graph, c, delta, expanded_delta);
- }
- else
- {
- bitmap tmp;
- bool flag = false;
-
- gcc_checking_assert (c->rhs.type == SCALAR && c->lhs.type == SCALAR
- && c->rhs.offset != 0 && c->lhs.offset == 0);
- tmp = get_varinfo (c->lhs.var)->solution;
-
- flag = set_union_with_increment (tmp, delta, c->rhs.offset,
- expanded_delta);
-
- if (flag)
- bitmap_set_bit (changed, c->lhs.var);
- }
-}
-
-/* Initialize and return a new SCC info structure. */
-
-scc_info::scc_info (size_t size) :
- visited (size), deleted (size), current_index (0), scc_stack (1)
-{
- bitmap_clear (visited);
- bitmap_clear (deleted);
- node_mapping = XNEWVEC (unsigned int, size);
- dfs = XCNEWVEC (unsigned int, size);
-
- for (size_t i = 0; i < size; i++)
- node_mapping[i] = i;
-}
-
-/* Free an SCC info structure pointed to by SI */
-
-scc_info::~scc_info ()
-{
- free (node_mapping);
- free (dfs);
-}
-
-
-/* Find indirect cycles in GRAPH that occur, using strongly connected
- components, and note them in the indirect cycles map.
-
- This technique comes from Ben Hardekopf and Calvin Lin,
- "It Pays to be Lazy: Fast and Accurate Pointer Analysis for Millions of
- Lines of Code", submitted to PLDI 2007. */
-
-static void
-find_indirect_cycles (constraint_graph_t graph)
-{
- unsigned int i;
- unsigned int size = graph->size;
- scc_info si (size);
-
- for (i = 0; i < MIN (LAST_REF_NODE, size); i ++ )
- if (!bitmap_bit_p (si.visited, i) && find (i) == i)
- scc_visit (graph, &si, i);
-}
-
-/* Compute a topological ordering for GRAPH, and store the result in the
- topo_info structure TI. */
-
-static void
-compute_topo_order (constraint_graph_t graph,
- struct topo_info *ti)
-{
- unsigned int i;
- unsigned int size = graph->size;
-
- for (i = 0; i != size; ++i)
- if (!bitmap_bit_p (ti->visited, i) && find (i) == i)
- topo_visit (graph, ti, i);
-}
-
-/* Structure used to for hash value numbering of pointer equivalence
- classes. */
-
-typedef struct equiv_class_label
-{
- hashval_t hashcode;
- unsigned int equivalence_class;
- bitmap labels;
-} *equiv_class_label_t;
-typedef const struct equiv_class_label *const_equiv_class_label_t;
-
-/* Equiv_class_label hashtable helpers. */
-
-struct equiv_class_hasher : nofree_ptr_hash <equiv_class_label>
-{
- static inline hashval_t hash (const equiv_class_label *);
- static inline bool equal (const equiv_class_label *,
- const equiv_class_label *);
-};
-
-/* Hash function for a equiv_class_label_t */
-
-inline hashval_t
-equiv_class_hasher::hash (const equiv_class_label *ecl)
-{
- return ecl->hashcode;
-}
-
-/* Equality function for two equiv_class_label_t's. */
-
-inline bool
-equiv_class_hasher::equal (const equiv_class_label *eql1,
- const equiv_class_label *eql2)
-{
- return (eql1->hashcode == eql2->hashcode
- && bitmap_equal_p (eql1->labels, eql2->labels));
-}
-
-/* A hashtable for mapping a bitmap of labels->pointer equivalence
- classes. */
-static hash_table<equiv_class_hasher> *pointer_equiv_class_table;
-
-/* A hashtable for mapping a bitmap of labels->location equivalence
- classes. */
-static hash_table<equiv_class_hasher> *location_equiv_class_table;
-
-struct obstack equiv_class_obstack;
-
-/* Lookup a equivalence class in TABLE by the bitmap of LABELS with
- hash HAS it contains. Sets *REF_LABELS to the bitmap LABELS
- is equivalent to. */
-
-static equiv_class_label *
-equiv_class_lookup_or_add (hash_table<equiv_class_hasher> *table,
- bitmap labels)
-{
- equiv_class_label **slot;
- equiv_class_label ecl;
-
- ecl.labels = labels;
- ecl.hashcode = bitmap_hash (labels);
- slot = table->find_slot (&ecl, INSERT);
- if (!*slot)
- {
- *slot = XOBNEW (&equiv_class_obstack, struct equiv_class_label);
- (*slot)->labels = labels;
- (*slot)->hashcode = ecl.hashcode;
- (*slot)->equivalence_class = 0;
- }
-
- return *slot;
-}
-
-/* Perform offline variable substitution.
-
- This is a worst case quadratic time way of identifying variables
- that must have equivalent points-to sets, including those caused by
- static cycles, and single entry subgraphs, in the constraint graph.
-
- The technique is described in "Exploiting Pointer and Location
- Equivalence to Optimize Pointer Analysis. In the 14th International
- Static Analysis Symposium (SAS), August 2007." It is known as the
- "HU" algorithm, and is equivalent to value numbering the collapsed
- constraint graph including evaluating unions.
-
- The general method of finding equivalence classes is as follows:
- Add fake nodes (REF nodes) and edges for *a = b and a = *b constraints.
- Initialize all non-REF nodes to be direct nodes.
- For each constraint a = a U {b}, we set pts(a) = pts(a) u {fresh
- variable}
- For each constraint containing the dereference, we also do the same
- thing.
-
- We then compute SCC's in the graph and unify nodes in the same SCC,
- including pts sets.
-
- For each non-collapsed node x:
- Visit all unvisited explicit incoming edges.
- Ignoring all non-pointers, set pts(x) = Union of pts(a) for y
- where y->x.
- Lookup the equivalence class for pts(x).
- If we found one, equivalence_class(x) = found class.
- Otherwise, equivalence_class(x) = new class, and new_class is
- added to the lookup table.
-
- All direct nodes with the same equivalence class can be replaced
- with a single representative node.
- All unlabeled nodes (label == 0) are not pointers and all edges
- involving them can be eliminated.
- We perform these optimizations during rewrite_constraints
-
- In addition to pointer equivalence class finding, we also perform
- location equivalence class finding. This is the set of variables
- that always appear together in points-to sets. We use this to
- compress the size of the points-to sets. */
-
-/* Current maximum pointer equivalence class id. */
-static int pointer_equiv_class;
-
-/* Current maximum location equivalence class id. */
-static int location_equiv_class;
-
-/* Recursive routine to find strongly connected components in GRAPH,
- and label it's nodes with DFS numbers. */
-
-static void
-condense_visit (constraint_graph_t graph, class scc_info *si, unsigned int n)
-{
- unsigned int i;
- bitmap_iterator bi;
- unsigned int my_dfs;
-
- gcc_checking_assert (si->node_mapping[n] == n);
- bitmap_set_bit (si->visited, n);
- si->dfs[n] = si->current_index ++;
- my_dfs = si->dfs[n];
-
- /* Visit all the successors. */
- EXECUTE_IF_IN_NONNULL_BITMAP (graph->preds[n], 0, i, bi)
- {
- unsigned int w = si->node_mapping[i];
-
- if (bitmap_bit_p (si->deleted, w))
- continue;
-
- if (!bitmap_bit_p (si->visited, w))
- condense_visit (graph, si, w);
-
- unsigned int t = si->node_mapping[w];
- gcc_checking_assert (si->node_mapping[n] == n);
- if (si->dfs[t] < si->dfs[n])
- si->dfs[n] = si->dfs[t];
- }
-
- /* Visit all the implicit predecessors. */
- EXECUTE_IF_IN_NONNULL_BITMAP (graph->implicit_preds[n], 0, i, bi)
- {
- unsigned int w = si->node_mapping[i];
-
- if (bitmap_bit_p (si->deleted, w))
- continue;
-
- if (!bitmap_bit_p (si->visited, w))
- condense_visit (graph, si, w);
-
- unsigned int t = si->node_mapping[w];
- gcc_assert (si->node_mapping[n] == n);
- if (si->dfs[t] < si->dfs[n])
- si->dfs[n] = si->dfs[t];
- }
-
- /* See if any components have been identified. */
- if (si->dfs[n] == my_dfs)
- {
- if (si->scc_stack.length () != 0
- && si->dfs[si->scc_stack.last ()] >= my_dfs)
- {
- /* Find the first node of the SCC and do non-bitmap work. */
- bool direct_p = true;
- unsigned first = si->scc_stack.length ();
- do
- {
- --first;
- unsigned int w = si->scc_stack[first];
- si->node_mapping[w] = n;
- if (!bitmap_bit_p (graph->direct_nodes, w))
- direct_p = false;
- }
- while (first > 0
- && si->dfs[si->scc_stack[first - 1]] >= my_dfs);
- if (!direct_p)
- bitmap_clear_bit (graph->direct_nodes, n);
-
- /* Want to reduce to node n, push that first. */
- si->scc_stack.reserve (1);
- si->scc_stack.quick_push (si->scc_stack[first]);
- si->scc_stack[first] = n;
-
- unsigned scc_size = si->scc_stack.length () - first;
- unsigned split = scc_size / 2;
- unsigned carry = scc_size - split * 2;
- while (split > 0)
- {
- for (unsigned i = 0; i < split; ++i)
- {
- unsigned a = si->scc_stack[first + i];
- unsigned b = si->scc_stack[first + split + carry + i];
-
- /* Unify our nodes. */
- if (graph->preds[b])
- {
- if (!graph->preds[a])
- std::swap (graph->preds[a], graph->preds[b]);
- else
- bitmap_ior_into_and_free (graph->preds[a],
- &graph->preds[b]);
- }
- if (graph->implicit_preds[b])
- {
- if (!graph->implicit_preds[a])
- std::swap (graph->implicit_preds[a],
- graph->implicit_preds[b]);
- else
- bitmap_ior_into_and_free (graph->implicit_preds[a],
- &graph->implicit_preds[b]);
- }
- if (graph->points_to[b])
- {
- if (!graph->points_to[a])
- std::swap (graph->points_to[a], graph->points_to[b]);
- else
- bitmap_ior_into_and_free (graph->points_to[a],
- &graph->points_to[b]);
- }
- }
- unsigned remain = split + carry;
- split = remain / 2;
- carry = remain - split * 2;
- }
- /* Actually pop the SCC. */
- si->scc_stack.truncate (first);
- }
- bitmap_set_bit (si->deleted, n);
- }
- else
- si->scc_stack.safe_push (n);
-}
-
-/* Label pointer equivalences.
-
- This performs a value numbering of the constraint graph to
- discover which variables will always have the same points-to sets
- under the current set of constraints.
-
- The way it value numbers is to store the set of points-to bits
- generated by the constraints and graph edges. This is just used as a
- hash and equality comparison. The *actual set of points-to bits* is
- completely irrelevant, in that we don't care about being able to
- extract them later.
-
- The equality values (currently bitmaps) just have to satisfy a few
- constraints, the main ones being:
- 1. The combining operation must be order independent.
- 2. The end result of a given set of operations must be unique iff the
- combination of input values is unique
- 3. Hashable. */
-
-static void
-label_visit (constraint_graph_t graph, class scc_info *si, unsigned int n)
-{
- unsigned int i, first_pred;
- bitmap_iterator bi;
-
- bitmap_set_bit (si->visited, n);
-
- /* Label and union our incoming edges's points to sets. */
- first_pred = -1U;
- EXECUTE_IF_IN_NONNULL_BITMAP (graph->preds[n], 0, i, bi)
- {
- unsigned int w = si->node_mapping[i];
- if (!bitmap_bit_p (si->visited, w))
- label_visit (graph, si, w);
-
- /* Skip unused edges */
- if (w == n || graph->pointer_label[w] == 0)
- continue;
-
- if (graph->points_to[w])
- {
- if (!graph->points_to[n])
- {
- if (first_pred == -1U)
- first_pred = w;
- else
- {
- graph->points_to[n] = BITMAP_ALLOC (&predbitmap_obstack);
- bitmap_ior (graph->points_to[n],
- graph->points_to[first_pred],
- graph->points_to[w]);
- }
- }
- else
- bitmap_ior_into (graph->points_to[n], graph->points_to[w]);
- }
- }
-
- /* Indirect nodes get fresh variables and a new pointer equiv class. */
- if (!bitmap_bit_p (graph->direct_nodes, n))
- {
- if (!graph->points_to[n])
- {
- graph->points_to[n] = BITMAP_ALLOC (&predbitmap_obstack);
- if (first_pred != -1U)
- bitmap_copy (graph->points_to[n], graph->points_to[first_pred]);
- }
- bitmap_set_bit (graph->points_to[n], FIRST_REF_NODE + n);
- graph->pointer_label[n] = pointer_equiv_class++;
- equiv_class_label_t ecl;
- ecl = equiv_class_lookup_or_add (pointer_equiv_class_table,
- graph->points_to[n]);
- ecl->equivalence_class = graph->pointer_label[n];
- return;
- }
-
- /* If there was only a single non-empty predecessor the pointer equiv
- class is the same. */
- if (!graph->points_to[n])
- {
- if (first_pred != -1U)
- {
- graph->pointer_label[n] = graph->pointer_label[first_pred];
- graph->points_to[n] = graph->points_to[first_pred];
- }
- return;
- }
-
- if (!bitmap_empty_p (graph->points_to[n]))
- {
- equiv_class_label_t ecl;
- ecl = equiv_class_lookup_or_add (pointer_equiv_class_table,
- graph->points_to[n]);
- if (ecl->equivalence_class == 0)
- ecl->equivalence_class = pointer_equiv_class++;
- else
- {
- BITMAP_FREE (graph->points_to[n]);
- graph->points_to[n] = ecl->labels;
- }
- graph->pointer_label[n] = ecl->equivalence_class;
- }
-}
-
-/* Print the pred graph in dot format. */
-
-static void
-dump_pred_graph (class scc_info *si, FILE *file)
-{
- unsigned int i;
-
- /* Only print the graph if it has already been initialized: */
- if (!graph)
- return;
-
- /* Prints the header of the dot file: */
- fprintf (file, "strict digraph {\n");
- fprintf (file, " node [\n shape = box\n ]\n");
- fprintf (file, " edge [\n fontsize = \"12\"\n ]\n");
- fprintf (file, "\n // List of nodes and complex constraints in "
- "the constraint graph:\n");
-
- /* The next lines print the nodes in the graph together with the
- complex constraints attached to them. */
- for (i = 1; i < graph->size; i++)
- {
- if (i == FIRST_REF_NODE)
- continue;
- if (si->node_mapping[i] != i)
- continue;
- if (i < FIRST_REF_NODE)
- fprintf (file, "\"%s\"", get_varinfo (i)->name);
- else
- fprintf (file, "\"*%s\"", get_varinfo (i - FIRST_REF_NODE)->name);
- if (graph->points_to[i]
- && !bitmap_empty_p (graph->points_to[i]))
- {
- if (i < FIRST_REF_NODE)
- fprintf (file, "[label=\"%s = {", get_varinfo (i)->name);
- else
- fprintf (file, "[label=\"*%s = {",
- get_varinfo (i - FIRST_REF_NODE)->name);
- unsigned j;
- bitmap_iterator bi;
- EXECUTE_IF_SET_IN_BITMAP (graph->points_to[i], 0, j, bi)
- fprintf (file, " %d", j);
- fprintf (file, " }\"]");
- }
- fprintf (file, ";\n");
- }
-
- /* Go over the edges. */
- fprintf (file, "\n // Edges in the constraint graph:\n");
- for (i = 1; i < graph->size; i++)
- {
- unsigned j;
- bitmap_iterator bi;
- if (si->node_mapping[i] != i)
- continue;
- EXECUTE_IF_IN_NONNULL_BITMAP (graph->preds[i], 0, j, bi)
- {
- unsigned from = si->node_mapping[j];
- if (from < FIRST_REF_NODE)
- fprintf (file, "\"%s\"", get_varinfo (from)->name);
- else
- fprintf (file, "\"*%s\"", get_varinfo (from - FIRST_REF_NODE)->name);
- fprintf (file, " -> ");
- if (i < FIRST_REF_NODE)
- fprintf (file, "\"%s\"", get_varinfo (i)->name);
- else
- fprintf (file, "\"*%s\"", get_varinfo (i - FIRST_REF_NODE)->name);
- fprintf (file, ";\n");
- }
- }
-
- /* Prints the tail of the dot file. */
- fprintf (file, "}\n");
-}
-
-/* Perform offline variable substitution, discovering equivalence
- classes, and eliminating non-pointer variables. */
-
-static class scc_info *
-perform_var_substitution (constraint_graph_t graph)
-{
- unsigned int i;
- unsigned int size = graph->size;
- scc_info *si = new scc_info (size);
-
- bitmap_obstack_initialize (&iteration_obstack);
- gcc_obstack_init (&equiv_class_obstack);
- pointer_equiv_class_table = new hash_table<equiv_class_hasher> (511);
- location_equiv_class_table
- = new hash_table<equiv_class_hasher> (511);
- pointer_equiv_class = 1;
- location_equiv_class = 1;
-
- /* Condense the nodes, which means to find SCC's, count incoming
- predecessors, and unite nodes in SCC's. */
- for (i = 1; i < FIRST_REF_NODE; i++)
- if (!bitmap_bit_p (si->visited, si->node_mapping[i]))
- condense_visit (graph, si, si->node_mapping[i]);
-
- if (dump_file && (dump_flags & TDF_GRAPH))
- {
- fprintf (dump_file, "\n\n// The constraint graph before var-substitution "
- "in dot format:\n");
- dump_pred_graph (si, dump_file);
- fprintf (dump_file, "\n\n");
- }
-
- bitmap_clear (si->visited);
- /* Actually the label the nodes for pointer equivalences */
- for (i = 1; i < FIRST_REF_NODE; i++)
- if (!bitmap_bit_p (si->visited, si->node_mapping[i]))
- label_visit (graph, si, si->node_mapping[i]);
-
- /* Calculate location equivalence labels. */
- for (i = 1; i < FIRST_REF_NODE; i++)
- {
- bitmap pointed_by;
- bitmap_iterator bi;
- unsigned int j;
-
- if (!graph->pointed_by[i])
- continue;
- pointed_by = BITMAP_ALLOC (&iteration_obstack);
-
- /* Translate the pointed-by mapping for pointer equivalence
- labels. */
- EXECUTE_IF_SET_IN_BITMAP (graph->pointed_by[i], 0, j, bi)
- {
- bitmap_set_bit (pointed_by,
- graph->pointer_label[si->node_mapping[j]]);
- }
- /* The original pointed_by is now dead. */
- BITMAP_FREE (graph->pointed_by[i]);
-
- /* Look up the location equivalence label if one exists, or make
- one otherwise. */
- equiv_class_label_t ecl;
- ecl = equiv_class_lookup_or_add (location_equiv_class_table, pointed_by);
- if (ecl->equivalence_class == 0)
- ecl->equivalence_class = location_equiv_class++;
- else
- {
- if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, "Found location equivalence for node %s\n",
- get_varinfo (i)->name);
- BITMAP_FREE (pointed_by);
- }
- graph->loc_label[i] = ecl->equivalence_class;
-
- }
-
- if (dump_file && (dump_flags & TDF_DETAILS))
- for (i = 1; i < FIRST_REF_NODE; i++)
- {
- unsigned j = si->node_mapping[i];
- if (j != i)
- {
- fprintf (dump_file, "%s node id %d ",
- bitmap_bit_p (graph->direct_nodes, i)
- ? "Direct" : "Indirect", i);
- if (i < FIRST_REF_NODE)
- fprintf (dump_file, "\"%s\"", get_varinfo (i)->name);
- else
- fprintf (dump_file, "\"*%s\"",
- get_varinfo (i - FIRST_REF_NODE)->name);
- fprintf (dump_file, " mapped to SCC leader node id %d ", j);
- if (j < FIRST_REF_NODE)
- fprintf (dump_file, "\"%s\"\n", get_varinfo (j)->name);
- else
- fprintf (dump_file, "\"*%s\"\n",
- get_varinfo (j - FIRST_REF_NODE)->name);
- }
- else
- {
- fprintf (dump_file,
- "Equivalence classes for %s node id %d ",
- bitmap_bit_p (graph->direct_nodes, i)
- ? "direct" : "indirect", i);
- if (i < FIRST_REF_NODE)
- fprintf (dump_file, "\"%s\"", get_varinfo (i)->name);
- else
- fprintf (dump_file, "\"*%s\"",
- get_varinfo (i - FIRST_REF_NODE)->name);
- fprintf (dump_file,
- ": pointer %d, location %d\n",
- graph->pointer_label[i], graph->loc_label[i]);
- }
- }
-
- /* Quickly eliminate our non-pointer variables. */
-
- for (i = 1; i < FIRST_REF_NODE; i++)
- {
- unsigned int node = si->node_mapping[i];
-
- if (graph->pointer_label[node] == 0)
- {
- if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file,
- "%s is a non-pointer variable, eliminating edges.\n",
- get_varinfo (node)->name);
- stats.nonpointer_vars++;
- clear_edges_for_node (graph, node);
- }
- }
-
- return si;
-}
-
-/* Free information that was only necessary for variable
- substitution. */
-
-static void
-free_var_substitution_info (class scc_info *si)
-{
- delete si;
- free (graph->pointer_label);
- free (graph->loc_label);
- free (graph->pointed_by);
- free (graph->points_to);
- free (graph->eq_rep);
- sbitmap_free (graph->direct_nodes);
- delete pointer_equiv_class_table;
- pointer_equiv_class_table = NULL;
- delete location_equiv_class_table;
- location_equiv_class_table = NULL;
- obstack_free (&equiv_class_obstack, NULL);
- bitmap_obstack_release (&iteration_obstack);
-}
-
-/* Return an existing node that is equivalent to NODE, which has
- equivalence class LABEL, if one exists. Return NODE otherwise. */
-
-static unsigned int
-find_equivalent_node (constraint_graph_t graph,
- unsigned int node, unsigned int label)
-{
- /* If the address version of this variable is unused, we can
- substitute it for anything else with the same label.
- Otherwise, we know the pointers are equivalent, but not the
- locations, and we can unite them later. */
-
- if (!bitmap_bit_p (graph->address_taken, node))
- {
- gcc_checking_assert (label < graph->size);
-
- if (graph->eq_rep[label] != -1)
- {
- /* Unify the two variables since we know they are equivalent. */
- if (unite (graph->eq_rep[label], node))
- unify_nodes (graph, graph->eq_rep[label], node, false);
- return graph->eq_rep[label];
- }
- else
- {
- graph->eq_rep[label] = node;
- graph->pe_rep[label] = node;
- }
- }
- else
- {
- gcc_checking_assert (label < graph->size);
- graph->pe[node] = label;
- if (graph->pe_rep[label] == -1)
- graph->pe_rep[label] = node;
- }
-
- return node;
-}
-
-/* Unite pointer equivalent but not location equivalent nodes in
- GRAPH. This may only be performed once variable substitution is
- finished. */
-
-static void
-unite_pointer_equivalences (constraint_graph_t graph)
-{
- unsigned int i;
-
- /* Go through the pointer equivalences and unite them to their
- representative, if they aren't already. */
- for (i = 1; i < FIRST_REF_NODE; i++)
- {
- unsigned int label = graph->pe[i];
- if (label)
- {
- int label_rep = graph->pe_rep[label];
-
- if (label_rep == -1)
- continue;
-
- label_rep = find (label_rep);
- if (label_rep >= 0 && unite (label_rep, find (i)))
- unify_nodes (graph, label_rep, i, false);
- }
- }
-}
-
-/* Move complex constraints to the GRAPH nodes they belong to. */
-
-static void
-move_complex_constraints (constraint_graph_t graph)
-{
- int i;
- constraint_t c;
-
- FOR_EACH_VEC_ELT (constraints, i, c)
- {
- if (c)
- {
- struct constraint_expr lhs = c->lhs;
- struct constraint_expr rhs = c->rhs;
-
- if (lhs.type == DEREF)
- {
- insert_into_complex (graph, lhs.var, c);
- }
- else if (rhs.type == DEREF)
- {
- if (!(get_varinfo (lhs.var)->is_special_var))
- insert_into_complex (graph, rhs.var, c);
- }
- else if (rhs.type != ADDRESSOF && lhs.var > anything_id
- && (lhs.offset != 0 || rhs.offset != 0))
- {
- insert_into_complex (graph, rhs.var, c);
- }
- }
- }
-}
-
-
-/* Optimize and rewrite complex constraints while performing
- collapsing of equivalent nodes. SI is the SCC_INFO that is the
- result of perform_variable_substitution. */
-
-static void
-rewrite_constraints (constraint_graph_t graph,
- class scc_info *si)
-{
- int i;
- constraint_t c;
-
- if (flag_checking)
- {
- for (unsigned int j = 0; j < graph->size; j++)
- gcc_assert (find (j) == j);
- }
-
- FOR_EACH_VEC_ELT (constraints, i, c)
- {
- struct constraint_expr lhs = c->lhs;
- struct constraint_expr rhs = c->rhs;
- unsigned int lhsvar = find (lhs.var);
- unsigned int rhsvar = find (rhs.var);
- unsigned int lhsnode, rhsnode;
- unsigned int lhslabel, rhslabel;
-
- lhsnode = si->node_mapping[lhsvar];
- rhsnode = si->node_mapping[rhsvar];
- lhslabel = graph->pointer_label[lhsnode];
- rhslabel = graph->pointer_label[rhsnode];
-
- /* See if it is really a non-pointer variable, and if so, ignore
- the constraint. */
- if (lhslabel == 0)
- {
- if (dump_file && (dump_flags & TDF_DETAILS))
- {
-
- fprintf (dump_file, "%s is a non-pointer variable, "
- "ignoring constraint:",
- get_varinfo (lhs.var)->name);
- dump_constraint (dump_file, c);
- fprintf (dump_file, "\n");
- }
- constraints[i] = NULL;
- continue;
- }
-
- if (rhslabel == 0)
- {
- if (dump_file && (dump_flags & TDF_DETAILS))
- {
-
- fprintf (dump_file, "%s is a non-pointer variable, "
- "ignoring constraint:",
- get_varinfo (rhs.var)->name);
- dump_constraint (dump_file, c);
- fprintf (dump_file, "\n");
- }
- constraints[i] = NULL;
- continue;
- }
-
- lhsvar = find_equivalent_node (graph, lhsvar, lhslabel);
- rhsvar = find_equivalent_node (graph, rhsvar, rhslabel);
- c->lhs.var = lhsvar;
- c->rhs.var = rhsvar;
- }
-}
-
-/* Eliminate indirect cycles involving NODE. Return true if NODE was
- part of an SCC, false otherwise. */
-
-static bool
-eliminate_indirect_cycles (unsigned int node)
-{
- if (graph->indirect_cycles[node] != -1
- && !bitmap_empty_p (get_varinfo (node)->solution))
- {
- unsigned int i;
- auto_vec<unsigned> queue;
- int queuepos;
- unsigned int to = find (graph->indirect_cycles[node]);
- bitmap_iterator bi;
-
- /* We can't touch the solution set and call unify_nodes
- at the same time, because unify_nodes is going to do
- bitmap unions into it. */
-
- EXECUTE_IF_SET_IN_BITMAP (get_varinfo (node)->solution, 0, i, bi)
- {
- if (find (i) == i && i != to)
- {
- if (unite (to, i))
- queue.safe_push (i);
- }
- }
-
- for (queuepos = 0;
- queue.iterate (queuepos, &i);
- queuepos++)
- {
- unify_nodes (graph, to, i, true);
- }
- return true;
- }
- return false;
-}
-
-/* Solve the constraint graph GRAPH using our worklist solver.
- This is based on the PW* family of solvers from the "Efficient Field
- Sensitive Pointer Analysis for C" paper.
- It works by iterating over all the graph nodes, processing the complex
- constraints and propagating the copy constraints, until everything stops
- changed. This corresponds to steps 6-8 in the solving list given above. */
-
-static void
-solve_graph (constraint_graph_t graph)
-{
- unsigned int size = graph->size;
- unsigned int i;
- bitmap pts;
-
- changed = BITMAP_ALLOC (NULL);
-
- /* Mark all initial non-collapsed nodes as changed. */
- for (i = 1; i < size; i++)
- {
- varinfo_t ivi = get_varinfo (i);
- if (find (i) == i && !bitmap_empty_p (ivi->solution)
- && ((graph->succs[i] && !bitmap_empty_p (graph->succs[i]))
- || graph->complex[i].length () > 0))
- bitmap_set_bit (changed, i);
- }
-
- /* Allocate a bitmap to be used to store the changed bits. */
- pts = BITMAP_ALLOC (&pta_obstack);
-
- while (!bitmap_empty_p (changed))
- {
- unsigned int i;
- struct topo_info *ti = init_topo_info ();
- stats.iterations++;
-
- bitmap_obstack_initialize (&iteration_obstack);
-
- compute_topo_order (graph, ti);
-
- while (ti->topo_order.length () != 0)
- {
-
- i = ti->topo_order.pop ();
-
- /* If this variable is not a representative, skip it. */
- if (find (i) != i)
- continue;
-
- /* In certain indirect cycle cases, we may merge this
- variable to another. */
- if (eliminate_indirect_cycles (i) && find (i) != i)
- continue;
-
- /* If the node has changed, we need to process the
- complex constraints and outgoing edges again. */
- if (bitmap_clear_bit (changed, i))
- {
- unsigned int j;
- constraint_t c;
- bitmap solution;
- vec<constraint_t> complex = graph->complex[i];
- varinfo_t vi = get_varinfo (i);
- bool solution_empty;
-
- /* Compute the changed set of solution bits. If anything
- is in the solution just propagate that. */
- if (bitmap_bit_p (vi->solution, anything_id))
- {
- /* If anything is also in the old solution there is
- nothing to do.
- ??? But we shouldn't ended up with "changed" set ... */
- if (vi->oldsolution
- && bitmap_bit_p (vi->oldsolution, anything_id))
- continue;
- bitmap_copy (pts, get_varinfo (find (anything_id))->solution);
- }
- else if (vi->oldsolution)
- bitmap_and_compl (pts, vi->solution, vi->oldsolution);
- else
- bitmap_copy (pts, vi->solution);
-
- if (bitmap_empty_p (pts))
- continue;
-
- if (vi->oldsolution)
- bitmap_ior_into (vi->oldsolution, pts);
- else
- {
- vi->oldsolution = BITMAP_ALLOC (&oldpta_obstack);
- bitmap_copy (vi->oldsolution, pts);
- }
-
- solution = vi->solution;
- solution_empty = bitmap_empty_p (solution);
-
- /* Process the complex constraints */
- bitmap expanded_pts = NULL;
- FOR_EACH_VEC_ELT (complex, j, c)
- {
- /* XXX: This is going to unsort the constraints in
- some cases, which will occasionally add duplicate
- constraints during unification. This does not
- affect correctness. */
- c->lhs.var = find (c->lhs.var);
- c->rhs.var = find (c->rhs.var);
-
- /* The only complex constraint that can change our
- solution to non-empty, given an empty solution,
- is a constraint where the lhs side is receiving
- some set from elsewhere. */
- if (!solution_empty || c->lhs.type != DEREF)
- do_complex_constraint (graph, c, pts, &expanded_pts);
- }
- BITMAP_FREE (expanded_pts);
-
- solution_empty = bitmap_empty_p (solution);
-
- if (!solution_empty)
- {
- bitmap_iterator bi;
- unsigned eff_escaped_id = find (escaped_id);
-
- /* Propagate solution to all successors. */
- unsigned to_remove = ~0U;
- EXECUTE_IF_IN_NONNULL_BITMAP (graph->succs[i],
- 0, j, bi)
- {
- if (to_remove != ~0U)
- {
- bitmap_clear_bit (graph->succs[i], to_remove);
- to_remove = ~0U;
- }
- unsigned int to = find (j);
- if (to != j)
- {
- /* Update the succ graph, avoiding duplicate
- work. */
- to_remove = j;
- if (! bitmap_set_bit (graph->succs[i], to))
- continue;
- /* We eventually end up processing 'to' twice
- as it is undefined whether bitmap iteration
- iterates over bits set during iteration.
- Play safe instead of doing tricks. */
- }
- /* Don't try to propagate to ourselves. */
- if (to == i)
- continue;
-
- bitmap tmp = get_varinfo (to)->solution;
- bool flag = false;
-
- /* If we propagate from ESCAPED use ESCAPED as
- placeholder. */
- if (i == eff_escaped_id)
- flag = bitmap_set_bit (tmp, escaped_id);
- else
- flag = bitmap_ior_into (tmp, pts);
-
- if (flag)
- bitmap_set_bit (changed, to);
- }
- if (to_remove != ~0U)
- bitmap_clear_bit (graph->succs[i], to_remove);
- }
- }
- }
- free_topo_info (ti);
- bitmap_obstack_release (&iteration_obstack);
- }
-
- BITMAP_FREE (pts);
- BITMAP_FREE (changed);
- bitmap_obstack_release (&oldpta_obstack);
-}
-
-/* Map from trees to variable infos. */
-static hash_map<tree, varinfo_t> *vi_for_tree;
-
-
-/* Insert ID as the variable id for tree T in the vi_for_tree map. */
-
-static void
-insert_vi_for_tree (tree t, varinfo_t vi)
-{
- gcc_assert (vi);
- gcc_assert (!vi_for_tree->put (t, vi));
-}
-
-/* Find the variable info for tree T in VI_FOR_TREE. If T does not
- exist in the map, return NULL, otherwise, return the varinfo we found. */
-
-static varinfo_t
-lookup_vi_for_tree (tree t)
-{
- varinfo_t *slot = vi_for_tree->get (t);
- if (slot == NULL)
- return NULL;
-
- return *slot;
-}
-
-/* Return a printable name for DECL */
-
-static const char *
-alias_get_name (tree decl)
-{
- const char *res = "NULL";
- if (dump_file)
- {
- char *temp = NULL;
- if (TREE_CODE (decl) == SSA_NAME)
- {
- res = get_name (decl);
- temp = xasprintf ("%s_%u", res ? res : "", SSA_NAME_VERSION (decl));
- }
- else if (HAS_DECL_ASSEMBLER_NAME_P (decl)
- && DECL_ASSEMBLER_NAME_SET_P (decl))
- res = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME_RAW (decl));
- else if (DECL_P (decl))
- {
- res = get_name (decl);
- if (!res)
- temp = xasprintf ("D.%u", DECL_UID (decl));
- }
-
- if (temp)
- {
- res = ggc_strdup (temp);
- free (temp);
- }
- }
-
- return res;
-}
-
-/* Find the variable id for tree T in the map.
- If T doesn't exist in the map, create an entry for it and return it. */
-
-static varinfo_t
-get_vi_for_tree (tree t)
-{
- varinfo_t *slot = vi_for_tree->get (t);
- if (slot == NULL)
- {
- unsigned int id = create_variable_info_for (t, alias_get_name (t), false);
- return get_varinfo (id);
- }
-
- return *slot;
-}
-
-/* Get a scalar constraint expression for a new temporary variable. */
-
-static struct constraint_expr
-new_scalar_tmp_constraint_exp (const char *name, bool add_id)
-{
- struct constraint_expr tmp;
- varinfo_t vi;
-
- vi = new_var_info (NULL_TREE, name, add_id);
- vi->offset = 0;
- vi->size = -1;
- vi->fullsize = -1;
- vi->is_full_var = 1;
- vi->is_reg_var = 1;
-
- tmp.var = vi->id;
- tmp.type = SCALAR;
- tmp.offset = 0;
-
- return tmp;
-}
-
-/* Get a constraint expression vector from an SSA_VAR_P node.
- If address_p is true, the result will be taken its address of. */
-
-static void
-get_constraint_for_ssa_var (tree t, vec<ce_s> *results, bool address_p)
-{
- struct constraint_expr cexpr;
- varinfo_t vi;
-
- /* We allow FUNCTION_DECLs here even though it doesn't make much sense. */
- gcc_assert (TREE_CODE (t) == SSA_NAME || DECL_P (t));
-
- if (TREE_CODE (t) == SSA_NAME
- && SSA_NAME_IS_DEFAULT_DEF (t))
- {
- /* For parameters, get at the points-to set for the actual parm
- decl. */
- if (TREE_CODE (SSA_NAME_VAR (t)) == PARM_DECL
- || TREE_CODE (SSA_NAME_VAR (t)) == RESULT_DECL)
- {
- get_constraint_for_ssa_var (SSA_NAME_VAR (t), results, address_p);
- return;
- }
- /* For undefined SSA names return nothing. */
- else if (!ssa_defined_default_def_p (t))
- {
- cexpr.var = nothing_id;
- cexpr.type = SCALAR;
- cexpr.offset = 0;
- results->safe_push (cexpr);
- return;
- }
- }
-
- /* For global variables resort to the alias target. */
- if (VAR_P (t) && (TREE_STATIC (t) || DECL_EXTERNAL (t)))
- {
- varpool_node *node = varpool_node::get (t);
- if (node && node->alias && node->analyzed)
- {
- node = node->ultimate_alias_target ();
- /* Canonicalize the PT uid of all aliases to the ultimate target.
- ??? Hopefully the set of aliases can't change in a way that
- changes the ultimate alias target. */
- gcc_assert ((! DECL_PT_UID_SET_P (node->decl)
- || DECL_PT_UID (node->decl) == DECL_UID (node->decl))
- && (! DECL_PT_UID_SET_P (t)
- || DECL_PT_UID (t) == DECL_UID (node->decl)));
- DECL_PT_UID (t) = DECL_UID (node->decl);
- t = node->decl;
- }
-
- /* If this is decl may bind to NULL note that. */
- if (address_p
- && (! node || ! node->nonzero_address ()))
- {
- cexpr.var = nothing_id;
- cexpr.type = SCALAR;
- cexpr.offset = 0;
- results->safe_push (cexpr);
- }
- }
-
- vi = get_vi_for_tree (t);
- cexpr.var = vi->id;
- cexpr.type = SCALAR;
- cexpr.offset = 0;
-
- /* If we are not taking the address of the constraint expr, add all
- sub-fiels of the variable as well. */
- if (!address_p
- && !vi->is_full_var)
- {
- for (; vi; vi = vi_next (vi))
- {
- cexpr.var = vi->id;
- results->safe_push (cexpr);
- }
- return;
- }
-
- results->safe_push (cexpr);
-}
-
-/* Process constraint T, performing various simplifications and then
- adding it to our list of overall constraints. */
-
-static void
-process_constraint (constraint_t t)
-{
- struct constraint_expr rhs = t->rhs;
- struct constraint_expr lhs = t->lhs;
-
- gcc_assert (rhs.var < varmap.length ());
- gcc_assert (lhs.var < varmap.length ());
-
- /* If we didn't get any useful constraint from the lhs we get
- &ANYTHING as fallback from get_constraint_for. Deal with
- it here by turning it into *ANYTHING. */
- if (lhs.type == ADDRESSOF
- && lhs.var == anything_id)
- lhs.type = DEREF;
-
- /* ADDRESSOF on the lhs is invalid. */
- gcc_assert (lhs.type != ADDRESSOF);
-
- /* We shouldn't add constraints from things that cannot have pointers.
- It's not completely trivial to avoid in the callers, so do it here. */
- if (rhs.type != ADDRESSOF
- && !get_varinfo (rhs.var)->may_have_pointers)
- return;
-
- /* Likewise adding to the solution of a non-pointer var isn't useful. */
- if (!get_varinfo (lhs.var)->may_have_pointers)
- return;
-
- /* This can happen in our IR with things like n->a = *p */
- if (rhs.type == DEREF && lhs.type == DEREF && rhs.var != anything_id)
- {
- /* Split into tmp = *rhs, *lhs = tmp */
- struct constraint_expr tmplhs;
- tmplhs = new_scalar_tmp_constraint_exp ("doubledereftmp", true);
- process_constraint (new_constraint (tmplhs, rhs));
- process_constraint (new_constraint (lhs, tmplhs));
- }
- else if ((rhs.type != SCALAR || rhs.offset != 0) && lhs.type == DEREF)
- {
- /* Split into tmp = &rhs, *lhs = tmp */
- struct constraint_expr tmplhs;
- tmplhs = new_scalar_tmp_constraint_exp ("derefaddrtmp", true);
- process_constraint (new_constraint (tmplhs, rhs));
- process_constraint (new_constraint (lhs, tmplhs));
- }
- else
- {
- gcc_assert (rhs.type != ADDRESSOF || rhs.offset == 0);
- if (rhs.type == ADDRESSOF)
- get_varinfo (get_varinfo (rhs.var)->head)->address_taken = true;
- constraints.safe_push (t);
- }
-}
-
-
-/* Return the position, in bits, of FIELD_DECL from the beginning of its
- structure. */
-
-static HOST_WIDE_INT
-bitpos_of_field (const tree fdecl)
-{
- if (!tree_fits_shwi_p (DECL_FIELD_OFFSET (fdecl))
- || !tree_fits_shwi_p (DECL_FIELD_BIT_OFFSET (fdecl)))
- return -1;
-
- return (tree_to_shwi (DECL_FIELD_OFFSET (fdecl)) * BITS_PER_UNIT
- + tree_to_shwi (DECL_FIELD_BIT_OFFSET (fdecl)));
-}
-
-
-/* Get constraint expressions for offsetting PTR by OFFSET. Stores the
- resulting constraint expressions in *RESULTS. */
-
-static void
-get_constraint_for_ptr_offset (tree ptr, tree offset,
- vec<ce_s> *results)
-{
- struct constraint_expr c;
- unsigned int j, n;
- HOST_WIDE_INT rhsoffset;
-
- /* If we do not do field-sensitive PTA adding offsets to pointers
- does not change the points-to solution. */
- if (!use_field_sensitive)
- {
- get_constraint_for_rhs (ptr, results);
- return;
- }
-
- /* If the offset is not a non-negative integer constant that fits
- in a HOST_WIDE_INT, we have to fall back to a conservative
- solution which includes all sub-fields of all pointed-to
- variables of ptr. */
- if (offset == NULL_TREE
- || TREE_CODE (offset) != INTEGER_CST)
- rhsoffset = UNKNOWN_OFFSET;
- else
- {
- /* Sign-extend the offset. */
- offset_int soffset = offset_int::from (wi::to_wide (offset), SIGNED);
- if (!wi::fits_shwi_p (soffset))
- rhsoffset = UNKNOWN_OFFSET;
- else
- {
- /* Make sure the bit-offset also fits. */
- HOST_WIDE_INT rhsunitoffset = soffset.to_shwi ();
- rhsoffset = rhsunitoffset * (unsigned HOST_WIDE_INT) BITS_PER_UNIT;
- if (rhsunitoffset != rhsoffset / BITS_PER_UNIT)
- rhsoffset = UNKNOWN_OFFSET;
- }
- }
-
- get_constraint_for_rhs (ptr, results);
- if (rhsoffset == 0)
- return;
-
- /* As we are eventually appending to the solution do not use
- vec::iterate here. */
- n = results->length ();
- for (j = 0; j < n; j++)
- {
- varinfo_t curr;
- c = (*results)[j];
- curr = get_varinfo (c.var);
-
- if (c.type == ADDRESSOF
- /* If this varinfo represents a full variable just use it. */
- && curr->is_full_var)
- ;
- else if (c.type == ADDRESSOF
- /* If we do not know the offset add all subfields. */
- && rhsoffset == UNKNOWN_OFFSET)
- {
- varinfo_t temp = get_varinfo (curr->head);
- do
- {
- struct constraint_expr c2;
- c2.var = temp->id;
- c2.type = ADDRESSOF;
- c2.offset = 0;
- if (c2.var != c.var)
- results->safe_push (c2);
- temp = vi_next (temp);
- }
- while (temp);
- }
- else if (c.type == ADDRESSOF)
- {
- varinfo_t temp;
- unsigned HOST_WIDE_INT offset = curr->offset + rhsoffset;
-
- /* If curr->offset + rhsoffset is less than zero adjust it. */
- if (rhsoffset < 0
- && curr->offset < offset)
- offset = 0;
-
- /* We have to include all fields that overlap the current
- field shifted by rhsoffset. And we include at least
- the last or the first field of the variable to represent
- reachability of off-bound addresses, in particular &object + 1,
- conservatively correct. */
- temp = first_or_preceding_vi_for_offset (curr, offset);
- c.var = temp->id;
- c.offset = 0;
- temp = vi_next (temp);
- while (temp
- && temp->offset < offset + curr->size)
- {
- struct constraint_expr c2;
- c2.var = temp->id;
- c2.type = ADDRESSOF;
- c2.offset = 0;
- results->safe_push (c2);
- temp = vi_next (temp);
- }
- }
- else if (c.type == SCALAR)
- {
- gcc_assert (c.offset == 0);
- c.offset = rhsoffset;
- }
- else
- /* We shouldn't get any DEREFs here. */
- gcc_unreachable ();
-
- (*results)[j] = c;
- }
-}
-
-
-/* Given a COMPONENT_REF T, return the constraint_expr vector for it.
- If address_p is true the result will be taken its address of.
- If lhs_p is true then the constraint expression is assumed to be used
- as the lhs. */
-
-static void
-get_constraint_for_component_ref (tree t, vec<ce_s> *results,
- bool address_p, bool lhs_p)
-{
- tree orig_t = t;
- poly_int64 bitsize = -1;
- poly_int64 bitmaxsize = -1;
- poly_int64 bitpos;
- bool reverse;
- tree forzero;
-
- /* Some people like to do cute things like take the address of
- &0->a.b */
- forzero = t;
- while (handled_component_p (forzero)
- || INDIRECT_REF_P (forzero)
- || TREE_CODE (forzero) == MEM_REF)
- forzero = TREE_OPERAND (forzero, 0);
-
- if (CONSTANT_CLASS_P (forzero) && integer_zerop (forzero))
- {
- struct constraint_expr temp;
-
- temp.offset = 0;
- temp.var = integer_id;
- temp.type = SCALAR;
- results->safe_push (temp);
- return;
- }
-
- t = get_ref_base_and_extent (t, &bitpos, &bitsize, &bitmaxsize, &reverse);
-
- /* We can end up here for component references on a
- VIEW_CONVERT_EXPR <>(&foobar) or things like a
- BIT_FIELD_REF <&MEM[(void *)&b + 4B], ...>. So for
- symbolic constants simply give up. */
- if (TREE_CODE (t) == ADDR_EXPR)
- {
- constraint_expr result;
- result.type = SCALAR;
- result.var = anything_id;
- result.offset = 0;
- results->safe_push (result);
- return;
- }
-
- /* Avoid creating pointer-offset constraints, so handle MEM_REF
- offsets directly. Pretend to take the address of the base,
- we'll take care of adding the required subset of sub-fields below. */
- if (TREE_CODE (t) == MEM_REF
- && !integer_zerop (TREE_OPERAND (t, 0)))
- {
- poly_offset_int off = mem_ref_offset (t);
- off <<= LOG2_BITS_PER_UNIT;
- off += bitpos;
- poly_int64 off_hwi;
- if (off.to_shwi (&off_hwi))
- bitpos = off_hwi;
- else
- {
- bitpos = 0;
- bitmaxsize = -1;
- }
- get_constraint_for_1 (TREE_OPERAND (t, 0), results, false, lhs_p);
- do_deref (results);
- }
- else
- get_constraint_for_1 (t, results, true, lhs_p);
-
- /* Strip off nothing_id. */
- if (results->length () == 2)
- {
- gcc_assert ((*results)[0].var == nothing_id);
- results->unordered_remove (0);
- }
- gcc_assert (results->length () == 1);
- struct constraint_expr &result = results->last ();
-
- if (result.type == SCALAR
- && get_varinfo (result.var)->is_full_var)
- /* For single-field vars do not bother about the offset. */
- result.offset = 0;
- else if (result.type == SCALAR)
- {
- /* In languages like C, you can access one past the end of an
- array. You aren't allowed to dereference it, so we can
- ignore this constraint. When we handle pointer subtraction,
- we may have to do something cute here. */
-
- if (maybe_lt (poly_uint64 (bitpos), get_varinfo (result.var)->fullsize)
- && maybe_ne (bitmaxsize, 0))
- {
- /* It's also not true that the constraint will actually start at the
- right offset, it may start in some padding. We only care about
- setting the constraint to the first actual field it touches, so
- walk to find it. */
- struct constraint_expr cexpr = result;
- varinfo_t curr;
- results->pop ();
- cexpr.offset = 0;
- for (curr = get_varinfo (cexpr.var); curr; curr = vi_next (curr))
- {
- if (ranges_maybe_overlap_p (poly_int64 (curr->offset),
- curr->size, bitpos, bitmaxsize))
- {
- cexpr.var = curr->id;
- results->safe_push (cexpr);
- if (address_p)
- break;
- }
- }
- /* If we are going to take the address of this field then
- to be able to compute reachability correctly add at least
- the last field of the variable. */
- if (address_p && results->length () == 0)
- {
- curr = get_varinfo (cexpr.var);
- while (curr->next != 0)
- curr = vi_next (curr);
- cexpr.var = curr->id;
- results->safe_push (cexpr);
- }
- else if (results->length () == 0)
- /* Assert that we found *some* field there. The user couldn't be
- accessing *only* padding. */
- /* Still the user could access one past the end of an array
- embedded in a struct resulting in accessing *only* padding. */
- /* Or accessing only padding via type-punning to a type
- that has a filed just in padding space. */
- {
- cexpr.type = SCALAR;
- cexpr.var = anything_id;
- cexpr.offset = 0;
- results->safe_push (cexpr);
- }
- }
- else if (known_eq (bitmaxsize, 0))
- {
- if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, "Access to zero-sized part of variable, "
- "ignoring\n");
- }
- else
- if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, "Access to past the end of variable, ignoring\n");
- }
- else if (result.type == DEREF)
- {
- /* If we do not know exactly where the access goes say so. Note
- that only for non-structure accesses we know that we access
- at most one subfiled of any variable. */
- HOST_WIDE_INT const_bitpos;
- if (!bitpos.is_constant (&const_bitpos)
- || const_bitpos == -1
- || maybe_ne (bitsize, bitmaxsize)
- || AGGREGATE_TYPE_P (TREE_TYPE (orig_t))
- || result.offset == UNKNOWN_OFFSET)
- result.offset = UNKNOWN_OFFSET;
- else
- result.offset += const_bitpos;
- }
- else if (result.type == ADDRESSOF)
- {
- /* We can end up here for component references on constants like
- VIEW_CONVERT_EXPR <>({ 0, 1, 2, 3 })[i]. */
- result.type = SCALAR;
- result.var = anything_id;
- result.offset = 0;
- }
- else
- gcc_unreachable ();
-}
-
-
-/* Dereference the constraint expression CONS, and return the result.
- DEREF (ADDRESSOF) = SCALAR
- DEREF (SCALAR) = DEREF
- DEREF (DEREF) = (temp = DEREF1; result = DEREF(temp))
- This is needed so that we can handle dereferencing DEREF constraints. */
-
-static void
-do_deref (vec<ce_s> *constraints)
-{
- struct constraint_expr *c;
- unsigned int i = 0;
-
- FOR_EACH_VEC_ELT (*constraints, i, c)
- {
- if (c->type == SCALAR)
- c->type = DEREF;
- else if (c->type == ADDRESSOF)
- c->type = SCALAR;
- else if (c->type == DEREF)
- {
- struct constraint_expr tmplhs;
- tmplhs = new_scalar_tmp_constraint_exp ("dereftmp", true);
- process_constraint (new_constraint (tmplhs, *c));
- c->var = tmplhs.var;
- }
- else
- gcc_unreachable ();
- }
-}
-
-/* Given a tree T, return the constraint expression for taking the
- address of it. */
-
-static void
-get_constraint_for_address_of (tree t, vec<ce_s> *results)
-{
- struct constraint_expr *c;
- unsigned int i;
-
- get_constraint_for_1 (t, results, true, true);
-
- FOR_EACH_VEC_ELT (*results, i, c)
- {
- if (c->type == DEREF)
- c->type = SCALAR;
- else
- c->type = ADDRESSOF;
- }
-}
-
-/* Given a tree T, return the constraint expression for it. */
-
-static void
-get_constraint_for_1 (tree t, vec<ce_s> *results, bool address_p,
- bool lhs_p)
-{
- struct constraint_expr temp;
-
- /* x = integer is all glommed to a single variable, which doesn't
- point to anything by itself. That is, of course, unless it is an
- integer constant being treated as a pointer, in which case, we
- will return that this is really the addressof anything. This
- happens below, since it will fall into the default case. The only
- case we know something about an integer treated like a pointer is
- when it is the NULL pointer, and then we just say it points to
- NULL.
-
- Do not do that if -fno-delete-null-pointer-checks though, because
- in that case *NULL does not fail, so it _should_ alias *anything.
- It is not worth adding a new option or renaming the existing one,
- since this case is relatively obscure. */
- if ((TREE_CODE (t) == INTEGER_CST
- && integer_zerop (t))
- /* The only valid CONSTRUCTORs in gimple with pointer typed
- elements are zero-initializer. But in IPA mode we also
- process global initializers, so verify at least. */
- || (TREE_CODE (t) == CONSTRUCTOR
- && CONSTRUCTOR_NELTS (t) == 0))
- {
- if (flag_delete_null_pointer_checks)
- temp.var = nothing_id;
- else
- temp.var = nonlocal_id;
- temp.type = ADDRESSOF;
- temp.offset = 0;
- results->safe_push (temp);
- return;
- }
-
- /* String constants are read-only, ideally we'd have a CONST_DECL
- for those. */
- if (TREE_CODE (t) == STRING_CST)
- {
- temp.var = string_id;
- temp.type = SCALAR;
- temp.offset = 0;
- results->safe_push (temp);
- return;
- }
-
- switch (TREE_CODE_CLASS (TREE_CODE (t)))
- {
- case tcc_expression:
- {
- switch (TREE_CODE (t))
- {
- case ADDR_EXPR:
- get_constraint_for_address_of (TREE_OPERAND (t, 0), results);
- return;
- default:;
- }
- break;
- }
- case tcc_reference:
- {
- switch (TREE_CODE (t))
- {
- case MEM_REF:
- {
- struct constraint_expr cs;
- varinfo_t vi, curr;
- get_constraint_for_ptr_offset (TREE_OPERAND (t, 0),
- TREE_OPERAND (t, 1), results);
- do_deref (results);
-
- /* If we are not taking the address then make sure to process
- all subvariables we might access. */
- if (address_p)
- return;
-
- cs = results->last ();
- if (cs.type == DEREF
- && type_can_have_subvars (TREE_TYPE (t)))
- {
- /* For dereferences this means we have to defer it
- to solving time. */
- results->last ().offset = UNKNOWN_OFFSET;
- return;
- }
- if (cs.type != SCALAR)
- return;
-
- vi = get_varinfo (cs.var);
- curr = vi_next (vi);
- if (!vi->is_full_var
- && curr)
- {
- unsigned HOST_WIDE_INT size;
- if (tree_fits_uhwi_p (TYPE_SIZE (TREE_TYPE (t))))
- size = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (t)));
- else
- size = -1;
- for (; curr; curr = vi_next (curr))
- {
- if (curr->offset - vi->offset < size)
- {
- cs.var = curr->id;
- results->safe_push (cs);
- }
- else
- break;
- }
- }
- return;
- }
- case ARRAY_REF:
- case ARRAY_RANGE_REF:
- case COMPONENT_REF:
- case IMAGPART_EXPR:
- case REALPART_EXPR:
- case BIT_FIELD_REF:
- get_constraint_for_component_ref (t, results, address_p, lhs_p);
- return;
- case VIEW_CONVERT_EXPR:
- get_constraint_for_1 (TREE_OPERAND (t, 0), results, address_p,
- lhs_p);
- return;
- /* We are missing handling for TARGET_MEM_REF here. */
- default:;
- }
- break;
- }
- case tcc_exceptional:
- {
- switch (TREE_CODE (t))
- {
- case SSA_NAME:
- {
- get_constraint_for_ssa_var (t, results, address_p);
- return;
- }
- case CONSTRUCTOR:
- {
- unsigned int i;
- tree val;
- auto_vec<ce_s> tmp;
- FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (t), i, val)
- {
- struct constraint_expr *rhsp;
- unsigned j;
- get_constraint_for_1 (val, &tmp, address_p, lhs_p);
- FOR_EACH_VEC_ELT (tmp, j, rhsp)
- results->safe_push (*rhsp);
- tmp.truncate (0);
- }
- /* We do not know whether the constructor was complete,
- so technically we have to add &NOTHING or &ANYTHING
- like we do for an empty constructor as well. */
- return;
- }
- default:;
- }
- break;
- }
- case tcc_declaration:
- {
- get_constraint_for_ssa_var (t, results, address_p);
- return;
- }
- case tcc_constant:
- {
- /* We cannot refer to automatic variables through constants. */
- temp.type = ADDRESSOF;
- temp.var = nonlocal_id;
- temp.offset = 0;
- results->safe_push (temp);
- return;
- }
- default:;
- }
-
- /* The default fallback is a constraint from anything. */
- temp.type = ADDRESSOF;
- temp.var = anything_id;
- temp.offset = 0;
- results->safe_push (temp);
-}
-
-/* Given a gimple tree T, return the constraint expression vector for it. */
-
-static void
-get_constraint_for (tree t, vec<ce_s> *results)
-{
- gcc_assert (results->length () == 0);
-
- get_constraint_for_1 (t, results, false, true);
-}
-
-/* Given a gimple tree T, return the constraint expression vector for it
- to be used as the rhs of a constraint. */
-
-static void
-get_constraint_for_rhs (tree t, vec<ce_s> *results)
-{
- gcc_assert (results->length () == 0);
-
- get_constraint_for_1 (t, results, false, false);
-}
-
-
-/* Efficiently generates constraints from all entries in *RHSC to all
- entries in *LHSC. */
-
-static void
-process_all_all_constraints (const vec<ce_s> &lhsc,
- const vec<ce_s> &rhsc)
-{
- struct constraint_expr *lhsp, *rhsp;
- unsigned i, j;
-
- if (lhsc.length () <= 1 || rhsc.length () <= 1)
- {
- FOR_EACH_VEC_ELT (lhsc, i, lhsp)
- FOR_EACH_VEC_ELT (rhsc, j, rhsp)
- process_constraint (new_constraint (*lhsp, *rhsp));
- }
- else
- {
- struct constraint_expr tmp;
- tmp = new_scalar_tmp_constraint_exp ("allalltmp", true);
- FOR_EACH_VEC_ELT (rhsc, i, rhsp)
- process_constraint (new_constraint (tmp, *rhsp));
- FOR_EACH_VEC_ELT (lhsc, i, lhsp)
- process_constraint (new_constraint (*lhsp, tmp));
- }
-}
-
-/* Handle aggregate copies by expanding into copies of the respective
- fields of the structures. */
-
-static void
-do_structure_copy (tree lhsop, tree rhsop)
-{
- struct constraint_expr *lhsp, *rhsp;
- auto_vec<ce_s> lhsc;
- auto_vec<ce_s> rhsc;
- unsigned j;
-
- get_constraint_for (lhsop, &lhsc);
- get_constraint_for_rhs (rhsop, &rhsc);
- lhsp = &lhsc[0];
- rhsp = &rhsc[0];
- if (lhsp->type == DEREF
- || (lhsp->type == ADDRESSOF && lhsp->var == anything_id)
- || rhsp->type == DEREF)
- {
- if (lhsp->type == DEREF)
- {
- gcc_assert (lhsc.length () == 1);
- lhsp->offset = UNKNOWN_OFFSET;
- }
- if (rhsp->type == DEREF)
- {
- gcc_assert (rhsc.length () == 1);
- rhsp->offset = UNKNOWN_OFFSET;
- }
- process_all_all_constraints (lhsc, rhsc);
- }
- else if (lhsp->type == SCALAR
- && (rhsp->type == SCALAR
- || rhsp->type == ADDRESSOF))
- {
- HOST_WIDE_INT lhssize, lhsoffset;
- HOST_WIDE_INT rhssize, rhsoffset;
- bool reverse;
- unsigned k = 0;
- if (!get_ref_base_and_extent_hwi (lhsop, &lhsoffset, &lhssize, &reverse)
- || !get_ref_base_and_extent_hwi (rhsop, &rhsoffset, &rhssize,
- &reverse))
- {
- process_all_all_constraints (lhsc, rhsc);
- return;
- }
- for (j = 0; lhsc.iterate (j, &lhsp);)
- {
- varinfo_t lhsv, rhsv;
- rhsp = &rhsc[k];
- lhsv = get_varinfo (lhsp->var);
- rhsv = get_varinfo (rhsp->var);
- if (lhsv->may_have_pointers
- && (lhsv->is_full_var
- || rhsv->is_full_var
- || ranges_overlap_p (lhsv->offset + rhsoffset, lhsv->size,
- rhsv->offset + lhsoffset, rhsv->size)))
- process_constraint (new_constraint (*lhsp, *rhsp));
- if (!rhsv->is_full_var
- && (lhsv->is_full_var
- || (lhsv->offset + rhsoffset + lhsv->size
- > rhsv->offset + lhsoffset + rhsv->size)))
- {
- ++k;
- if (k >= rhsc.length ())
- break;
- }
- else
- ++j;
- }
- }
- else
- gcc_unreachable ();
-}
-
-/* Create constraints ID = { rhsc }. */
-
-static void
-make_constraints_to (unsigned id, const vec<ce_s> &rhsc)
-{
- struct constraint_expr *c;
- struct constraint_expr includes;
- unsigned int j;
-
- includes.var = id;
- includes.offset = 0;
- includes.type = SCALAR;
-
- FOR_EACH_VEC_ELT (rhsc, j, c)
- process_constraint (new_constraint (includes, *c));
-}
-
-/* Create a constraint ID = OP. */
-
-static void
-make_constraint_to (unsigned id, tree op)
-{
- auto_vec<ce_s> rhsc;
- get_constraint_for_rhs (op, &rhsc);
- make_constraints_to (id, rhsc);
-}
-
-/* Create a constraint ID = &FROM. */
-
-static void
-make_constraint_from (varinfo_t vi, int from)
-{
- struct constraint_expr lhs, rhs;
-
- lhs.var = vi->id;
- lhs.offset = 0;
- lhs.type = SCALAR;
-
- rhs.var = from;
- rhs.offset = 0;
- rhs.type = ADDRESSOF;
- process_constraint (new_constraint (lhs, rhs));
-}
-
-/* Create a constraint ID = FROM. */
-
-static void
-make_copy_constraint (varinfo_t vi, int from)
-{
- struct constraint_expr lhs, rhs;
-
- lhs.var = vi->id;
- lhs.offset = 0;
- lhs.type = SCALAR;
-
- rhs.var = from;
- rhs.offset = 0;
- rhs.type = SCALAR;
- process_constraint (new_constraint (lhs, rhs));
-}
-
-/* Make constraints necessary to make OP escape. */
-
-static void
-make_escape_constraint (tree op)
-{
- make_constraint_to (escaped_id, op);
-}
-
-/* Make constraint necessary to make all indirect references
- from VI escape. */
-
-static void
-make_indirect_escape_constraint (varinfo_t vi)
-{
- struct constraint_expr lhs, rhs;
- /* escaped = *(VAR + UNKNOWN); */
- lhs.type = SCALAR;
- lhs.var = escaped_id;
- lhs.offset = 0;
- rhs.type = DEREF;
- rhs.var = vi->id;
- rhs.offset = UNKNOWN_OFFSET;
- process_constraint (new_constraint (lhs, rhs));
-}
-
-/* Add constraints to that the solution of VI is transitively closed. */
-
-static void
-make_transitive_closure_constraints (varinfo_t vi)
-{
- struct constraint_expr lhs, rhs;
-
- /* VAR = *(VAR + UNKNOWN); */
- lhs.type = SCALAR;
- lhs.var = vi->id;
- lhs.offset = 0;
- rhs.type = DEREF;
- rhs.var = vi->id;
- rhs.offset = UNKNOWN_OFFSET;
- process_constraint (new_constraint (lhs, rhs));
-}
-
-/* Add constraints to that the solution of VI has all subvariables added. */
-
-static void
-make_any_offset_constraints (varinfo_t vi)
-{
- struct constraint_expr lhs, rhs;
-
- /* VAR = VAR + UNKNOWN; */
- lhs.type = SCALAR;
- lhs.var = vi->id;
- lhs.offset = 0;
- rhs.type = SCALAR;
- rhs.var = vi->id;
- rhs.offset = UNKNOWN_OFFSET;
- process_constraint (new_constraint (lhs, rhs));
-}
-
-/* Temporary storage for fake var decls. */
-struct obstack fake_var_decl_obstack;
-
-/* Build a fake VAR_DECL acting as referrer to a DECL_UID. */
-
-static tree
-build_fake_var_decl (tree type)
-{
- tree decl = (tree) XOBNEW (&fake_var_decl_obstack, struct tree_var_decl);
- memset (decl, 0, sizeof (struct tree_var_decl));
- TREE_SET_CODE (decl, VAR_DECL);
- TREE_TYPE (decl) = type;
- DECL_UID (decl) = allocate_decl_uid ();
- SET_DECL_PT_UID (decl, -1);
- layout_decl (decl, 0);
- return decl;
-}
-
-/* Create a new artificial heap variable with NAME.
- Return the created variable. */
-
-static varinfo_t
-make_heapvar (const char *name, bool add_id)
-{
- varinfo_t vi;
- tree heapvar;
-
- heapvar = build_fake_var_decl (ptr_type_node);
- DECL_EXTERNAL (heapvar) = 1;
-
- vi = new_var_info (heapvar, name, add_id);
- vi->is_heap_var = true;
- vi->is_unknown_size_var = true;
- vi->offset = 0;
- vi->fullsize = ~0;
- vi->size = ~0;
- vi->is_full_var = true;
- insert_vi_for_tree (heapvar, vi);
-
- return vi;
-}
-
-/* Create a new artificial heap variable with NAME and make a
- constraint from it to LHS. Set flags according to a tag used
- for tracking restrict pointers. */
-
-static varinfo_t
-make_constraint_from_restrict (varinfo_t lhs, const char *name, bool add_id)
-{
- varinfo_t vi = make_heapvar (name, add_id);
- vi->is_restrict_var = 1;
- vi->is_global_var = 1;
- vi->may_have_pointers = 1;
- make_constraint_from (lhs, vi->id);
- return vi;
-}
-
-/* Create a new artificial heap variable with NAME and make a
- constraint from it to LHS. Set flags according to a tag used
- for tracking restrict pointers and make the artificial heap
- point to global memory. */
-
-static varinfo_t
-make_constraint_from_global_restrict (varinfo_t lhs, const char *name,
- bool add_id)
-{
- varinfo_t vi = make_constraint_from_restrict (lhs, name, add_id);
- make_copy_constraint (vi, nonlocal_id);
- return vi;
-}
-
-/* In IPA mode there are varinfos for different aspects of reach
- function designator. One for the points-to set of the return
- value, one for the variables that are clobbered by the function,
- one for its uses and one for each parameter (including a single
- glob for remaining variadic arguments). */
-
-enum { fi_clobbers = 1, fi_uses = 2,
- fi_static_chain = 3, fi_result = 4, fi_parm_base = 5 };
-
-/* Get a constraint for the requested part of a function designator FI
- when operating in IPA mode. */
-
-static struct constraint_expr
-get_function_part_constraint (varinfo_t fi, unsigned part)
-{
- struct constraint_expr c;
-
- gcc_assert (in_ipa_mode);
-
- if (fi->id == anything_id)
- {
- /* ??? We probably should have a ANYFN special variable. */
- c.var = anything_id;
- c.offset = 0;
- c.type = SCALAR;
- }
- else if (fi->decl && TREE_CODE (fi->decl) == FUNCTION_DECL)
- {
- varinfo_t ai = first_vi_for_offset (fi, part);
- if (ai)
- c.var = ai->id;
- else
- c.var = anything_id;
- c.offset = 0;
- c.type = SCALAR;
- }
- else
- {
- c.var = fi->id;
- c.offset = part;
- c.type = DEREF;
- }
-
- return c;
-}
-
-/* Produce constraints for argument ARG of call STMT with eaf flags
- FLAGS. RESULTS is array holding constraints for return value.
- CALLESCAPE_ID is variable where call loocal escapes are added.
- WRITES_GLOVEL_MEMORY is true if callee may write global memory. */
-
-static void
-handle_call_arg (gcall *stmt, tree arg, vec<ce_s> *results, int flags,
- int callescape_id, bool writes_global_memory)
-{
- int relevant_indirect_flags = EAF_NO_INDIRECT_CLOBBER | EAF_NO_INDIRECT_READ
- | EAF_NO_INDIRECT_ESCAPE;
- int relevant_flags = relevant_indirect_flags
- | EAF_NO_DIRECT_CLOBBER
- | EAF_NO_DIRECT_READ
- | EAF_NO_DIRECT_ESCAPE;
- if (gimple_call_lhs (stmt))
- {
- relevant_flags |= EAF_NOT_RETURNED_DIRECTLY | EAF_NOT_RETURNED_INDIRECTLY;
- relevant_indirect_flags |= EAF_NOT_RETURNED_INDIRECTLY;
-
- /* If value is never read from it can not be returned indirectly
- (except through the escape solution).
- For all flags we get these implications right except for
- not_returned because we miss return functions in ipa-prop. */
-
- if (flags & EAF_NO_DIRECT_READ)
- flags |= EAF_NOT_RETURNED_INDIRECTLY;
- }
-
- /* If the argument is not used we can ignore it.
- Similarly argument is invisile for us if it not clobbered, does not
- escape, is not read and can not be returned. */
- if ((flags & EAF_UNUSED) || ((flags & relevant_flags) == relevant_flags))
- return;
-
- /* Produce varinfo for direct accesses to ARG. */
- varinfo_t tem = new_var_info (NULL_TREE, "callarg", true);
- tem->is_reg_var = true;
- make_constraint_to (tem->id, arg);
- make_any_offset_constraints (tem);
-
- bool callarg_transitive = false;
-
- /* As an compile time optimization if we make no difference between
- direct and indirect accesses make arg transitively closed.
- This avoids the need to build indir arg and do everything twice. */
- if (((flags & EAF_NO_INDIRECT_CLOBBER) != 0)
- == ((flags & EAF_NO_DIRECT_CLOBBER) != 0)
- && (((flags & EAF_NO_INDIRECT_READ) != 0)
- == ((flags & EAF_NO_DIRECT_READ) != 0))
- && (((flags & EAF_NO_INDIRECT_ESCAPE) != 0)
- == ((flags & EAF_NO_DIRECT_ESCAPE) != 0))
- && (((flags & EAF_NOT_RETURNED_INDIRECTLY) != 0)
- == ((flags & EAF_NOT_RETURNED_DIRECTLY) != 0)))
- {
- make_transitive_closure_constraints (tem);
- callarg_transitive = true;
- gcc_checking_assert (!(flags & EAF_NO_DIRECT_READ));
- }
-
- /* If necessary, produce varinfo for indirect accesses to ARG. */
- varinfo_t indir_tem = NULL;
- if (!callarg_transitive
- && (flags & relevant_indirect_flags) != relevant_indirect_flags)
- {
- struct constraint_expr lhs, rhs;
- indir_tem = new_var_info (NULL_TREE, "indircallarg", true);
- indir_tem->is_reg_var = true;
-
- /* indir_term = *tem. */
- lhs.type = SCALAR;
- lhs.var = indir_tem->id;
- lhs.offset = 0;
-
- rhs.type = DEREF;
- rhs.var = tem->id;
- rhs.offset = UNKNOWN_OFFSET;
- process_constraint (new_constraint (lhs, rhs));
-
- make_any_offset_constraints (indir_tem);
-
- /* If we do not read indirectly there is no need for transitive closure.
- We know there is only one level of indirection. */
- if (!(flags & EAF_NO_INDIRECT_READ))
- make_transitive_closure_constraints (indir_tem);
- gcc_checking_assert (!(flags & EAF_NO_DIRECT_READ));
- }
-
- if (gimple_call_lhs (stmt))
- {
- if (!(flags & EAF_NOT_RETURNED_DIRECTLY))
- {
- struct constraint_expr cexpr;
- cexpr.var = tem->id;
- cexpr.type = SCALAR;
- cexpr.offset = 0;
- results->safe_push (cexpr);
- }
- if (!callarg_transitive & !(flags & EAF_NOT_RETURNED_INDIRECTLY))
- {
- struct constraint_expr cexpr;
- cexpr.var = indir_tem->id;
- cexpr.type = SCALAR;
- cexpr.offset = 0;
- results->safe_push (cexpr);
- }
- }
-
- if (!(flags & EAF_NO_DIRECT_READ))
- {
- varinfo_t uses = get_call_use_vi (stmt);
- make_copy_constraint (uses, tem->id);
- if (!callarg_transitive & !(flags & EAF_NO_INDIRECT_READ))
- make_copy_constraint (uses, indir_tem->id);
- }
- else
- /* To read indirectly we need to read directly. */
- gcc_checking_assert (flags & EAF_NO_INDIRECT_READ);
-
- if (!(flags & EAF_NO_DIRECT_CLOBBER))
- {
- struct constraint_expr lhs, rhs;
-
- /* *arg = callescape. */
- lhs.type = DEREF;
- lhs.var = tem->id;
- lhs.offset = 0;
-
- rhs.type = SCALAR;
- rhs.var = callescape_id;
- rhs.offset = 0;
- process_constraint (new_constraint (lhs, rhs));
-
- /* callclobbered = arg. */
- make_copy_constraint (get_call_clobber_vi (stmt), tem->id);
- }
- if (!callarg_transitive & !(flags & EAF_NO_INDIRECT_CLOBBER))
- {
- struct constraint_expr lhs, rhs;
-
- /* *indir_arg = callescape. */
- lhs.type = DEREF;
- lhs.var = indir_tem->id;
- lhs.offset = 0;
-
- rhs.type = SCALAR;
- rhs.var = callescape_id;
- rhs.offset = 0;
- process_constraint (new_constraint (lhs, rhs));
-
- /* callclobbered = indir_arg. */
- make_copy_constraint (get_call_clobber_vi (stmt), indir_tem->id);
- }
-
- if (!(flags & (EAF_NO_DIRECT_ESCAPE | EAF_NO_INDIRECT_ESCAPE)))
- {
- struct constraint_expr lhs, rhs;
-
- /* callescape = arg; */
- lhs.var = callescape_id;
- lhs.offset = 0;
- lhs.type = SCALAR;
-
- rhs.var = tem->id;
- rhs.offset = 0;
- rhs.type = SCALAR;
- process_constraint (new_constraint (lhs, rhs));
-
- if (writes_global_memory)
- make_escape_constraint (arg);
- }
- else if (!callarg_transitive & !(flags & EAF_NO_INDIRECT_ESCAPE))
- {
- struct constraint_expr lhs, rhs;
-
- /* callescape = *(indir_arg + UNKNOWN); */
- lhs.var = callescape_id;
- lhs.offset = 0;
- lhs.type = SCALAR;
-
- rhs.var = indir_tem->id;
- rhs.offset = 0;
- rhs.type = SCALAR;
- process_constraint (new_constraint (lhs, rhs));
-
- if (writes_global_memory)
- make_indirect_escape_constraint (tem);
- }
-}
-
-/* Determine global memory access of call STMT and update
- WRITES_GLOBAL_MEMORY, READS_GLOBAL_MEMORY and USES_GLOBAL_MEMORY. */
-
-static void
-determine_global_memory_access (gcall *stmt,
- bool *writes_global_memory,
- bool *reads_global_memory,
- bool *uses_global_memory)
-{
- tree callee;
- cgraph_node *node;
- modref_summary *summary;
-
- /* We need to detrmine reads to set uses. */
- gcc_assert (!uses_global_memory || reads_global_memory);
-
- if ((callee = gimple_call_fndecl (stmt)) != NULL_TREE
- && (node = cgraph_node::get (callee)) != NULL
- && (summary = get_modref_function_summary (node)))
- {
- if (writes_global_memory && *writes_global_memory)
- *writes_global_memory = summary->global_memory_written;
- if (reads_global_memory && *reads_global_memory)
- *reads_global_memory = summary->global_memory_read;
- if (reads_global_memory && uses_global_memory
- && !summary->calls_interposable
- && !*reads_global_memory && node->binds_to_current_def_p ())
- *uses_global_memory = false;
- }
- if ((writes_global_memory && *writes_global_memory)
- || (uses_global_memory && *uses_global_memory)
- || (reads_global_memory && *reads_global_memory))
- {
- attr_fnspec fnspec = gimple_call_fnspec (stmt);
- if (fnspec.known_p ())
- {
- if (writes_global_memory
- && !fnspec.global_memory_written_p ())
- *writes_global_memory = false;
- if (reads_global_memory && !fnspec.global_memory_read_p ())
- {
- *reads_global_memory = false;
- if (uses_global_memory)
- *uses_global_memory = false;
- }
- }
- }
-}
-
-/* For non-IPA mode, generate constraints necessary for a call on the
- RHS and collect return value constraint to RESULTS to be used later in
- handle_lhs_call.
-
- IMPLICIT_EAF_FLAGS are added to each function argument. If
- WRITES_GLOBAL_MEMORY is true function is assumed to possibly write to global
- memory. Similar for READS_GLOBAL_MEMORY. */
-
-static void
-handle_rhs_call (gcall *stmt, vec<ce_s> *results,
- int implicit_eaf_flags,
- bool writes_global_memory,
- bool reads_global_memory)
-{
- determine_global_memory_access (stmt, &writes_global_memory,
- &reads_global_memory,
- NULL);
-
- varinfo_t callescape = new_var_info (NULL_TREE, "callescape", true);
-
- /* If function can use global memory, add it to callescape
- and to possible return values. If not we can still use/return addresses
- of global symbols. */
- struct constraint_expr lhs, rhs;
-
- lhs.type = SCALAR;
- lhs.var = callescape->id;
- lhs.offset = 0;
-
- rhs.type = reads_global_memory ? SCALAR : ADDRESSOF;
- rhs.var = nonlocal_id;
- rhs.offset = 0;
-
- process_constraint (new_constraint (lhs, rhs));
- results->safe_push (rhs);
-
- varinfo_t uses = get_call_use_vi (stmt);
- make_copy_constraint (uses, callescape->id);
-
- for (unsigned i = 0; i < gimple_call_num_args (stmt); ++i)
- {
- tree arg = gimple_call_arg (stmt, i);
- int flags = gimple_call_arg_flags (stmt, i);
- handle_call_arg (stmt, arg, results,
- flags | implicit_eaf_flags,
- callescape->id, writes_global_memory);
- }
-
- /* The static chain escapes as well. */
- if (gimple_call_chain (stmt))
- handle_call_arg (stmt, gimple_call_chain (stmt), results,
- implicit_eaf_flags
- | gimple_call_static_chain_flags (stmt),
- callescape->id, writes_global_memory);
-
- /* And if we applied NRV the address of the return slot escapes as well. */
- if (gimple_call_return_slot_opt_p (stmt)
- && gimple_call_lhs (stmt) != NULL_TREE
- && TREE_ADDRESSABLE (TREE_TYPE (gimple_call_lhs (stmt))))
- {
- int flags = gimple_call_retslot_flags (stmt);
- const int relevant_flags = EAF_NO_DIRECT_ESCAPE
- | EAF_NOT_RETURNED_DIRECTLY;
-
- if (!(flags & EAF_UNUSED) && (flags & relevant_flags) != relevant_flags)
- {
- auto_vec<ce_s> tmpc;
-
- get_constraint_for_address_of (gimple_call_lhs (stmt), &tmpc);
-
- if (!(flags & EAF_NO_DIRECT_ESCAPE))
- {
- make_constraints_to (callescape->id, tmpc);
- if (writes_global_memory)
- make_constraints_to (escaped_id, tmpc);
- }
- if (!(flags & EAF_NOT_RETURNED_DIRECTLY))
- {
- struct constraint_expr *c;
- unsigned i;
- FOR_EACH_VEC_ELT (tmpc, i, c)
- results->safe_push (*c);
- }
- }
- }
-}
-
-/* For non-IPA mode, generate constraints necessary for a call
- that returns a pointer and assigns it to LHS. This simply makes
- the LHS point to global and escaped variables. */
-
-static void
-handle_lhs_call (gcall *stmt, tree lhs, int flags, vec<ce_s> &rhsc,
- tree fndecl)
-{
- auto_vec<ce_s> lhsc;
-
- get_constraint_for (lhs, &lhsc);
- /* If the store is to a global decl make sure to
- add proper escape constraints. */
- lhs = get_base_address (lhs);
- if (lhs
- && DECL_P (lhs)
- && is_global_var (lhs))
- {
- struct constraint_expr tmpc;
- tmpc.var = escaped_id;
- tmpc.offset = 0;
- tmpc.type = SCALAR;
- lhsc.safe_push (tmpc);
- }
-
- /* If the call returns an argument unmodified override the rhs
- constraints. */
- if (flags & ERF_RETURNS_ARG
- && (flags & ERF_RETURN_ARG_MASK) < gimple_call_num_args (stmt))
- {
- tree arg;
- rhsc.create (0);
- arg = gimple_call_arg (stmt, flags & ERF_RETURN_ARG_MASK);
- get_constraint_for (arg, &rhsc);
- process_all_all_constraints (lhsc, rhsc);
- rhsc.release ();
- }
- else if (flags & ERF_NOALIAS)
- {
- varinfo_t vi;
- struct constraint_expr tmpc;
- rhsc.create (0);
- vi = make_heapvar ("HEAP", true);
- /* We are marking allocated storage local, we deal with it becoming
- global by escaping and setting of vars_contains_escaped_heap. */
- DECL_EXTERNAL (vi->decl) = 0;
- vi->is_global_var = 0;
- /* If this is not a real malloc call assume the memory was
- initialized and thus may point to global memory. All
- builtin functions with the malloc attribute behave in a sane way. */
- if (!fndecl
- || !fndecl_built_in_p (fndecl, BUILT_IN_NORMAL))
- make_constraint_from (vi, nonlocal_id);
- tmpc.var = vi->id;
- tmpc.offset = 0;
- tmpc.type = ADDRESSOF;
- rhsc.safe_push (tmpc);
- process_all_all_constraints (lhsc, rhsc);
- rhsc.release ();
- }
- else
- process_all_all_constraints (lhsc, rhsc);
-}
-
-
-/* Return the varinfo for the callee of CALL. */
-
-static varinfo_t
-get_fi_for_callee (gcall *call)
-{
- tree decl, fn = gimple_call_fn (call);
-
- if (fn && TREE_CODE (fn) == OBJ_TYPE_REF)
- fn = OBJ_TYPE_REF_EXPR (fn);
-
- /* If we can directly resolve the function being called, do so.
- Otherwise, it must be some sort of indirect expression that
- we should still be able to handle. */
- decl = gimple_call_addr_fndecl (fn);
- if (decl)
- return get_vi_for_tree (decl);
-
- /* If the function is anything other than a SSA name pointer we have no
- clue and should be getting ANYFN (well, ANYTHING for now). */
- if (!fn || TREE_CODE (fn) != SSA_NAME)
- return get_varinfo (anything_id);
-
- if (SSA_NAME_IS_DEFAULT_DEF (fn)
- && (TREE_CODE (SSA_NAME_VAR (fn)) == PARM_DECL
- || TREE_CODE (SSA_NAME_VAR (fn)) == RESULT_DECL))
- fn = SSA_NAME_VAR (fn);
-
- return get_vi_for_tree (fn);
-}
-
-/* Create constraints for assigning call argument ARG to the incoming parameter
- INDEX of function FI. */
-
-static void
-find_func_aliases_for_call_arg (varinfo_t fi, unsigned index, tree arg)
-{
- struct constraint_expr lhs;
- lhs = get_function_part_constraint (fi, fi_parm_base + index);
-
- auto_vec<ce_s, 2> rhsc;
- get_constraint_for_rhs (arg, &rhsc);
-
- unsigned j;
- struct constraint_expr *rhsp;
- FOR_EACH_VEC_ELT (rhsc, j, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
-}
-
-/* Return true if FNDECL may be part of another lto partition. */
-
-static bool
-fndecl_maybe_in_other_partition (tree fndecl)
-{
- cgraph_node *fn_node = cgraph_node::get (fndecl);
- if (fn_node == NULL)
- return true;
-
- return fn_node->in_other_partition;
-}
-
-/* Create constraints for the builtin call T. Return true if the call
- was handled, otherwise false. */
-
-static bool
-find_func_aliases_for_builtin_call (struct function *fn, gcall *t)
-{
- tree fndecl = gimple_call_fndecl (t);
- auto_vec<ce_s, 2> lhsc;
- auto_vec<ce_s, 4> rhsc;
- varinfo_t fi;
-
- if (gimple_call_builtin_p (t, BUILT_IN_NORMAL))
- /* ??? All builtins that are handled here need to be handled
- in the alias-oracle query functions explicitly! */
- switch (DECL_FUNCTION_CODE (fndecl))
- {
- /* All the following functions return a pointer to the same object
- as their first argument points to. The functions do not add
- to the ESCAPED solution. The functions make the first argument
- pointed to memory point to what the second argument pointed to
- memory points to. */
- case BUILT_IN_STRCPY:
- case BUILT_IN_STRNCPY:
- case BUILT_IN_BCOPY:
- case BUILT_IN_MEMCPY:
- case BUILT_IN_MEMMOVE:
- case BUILT_IN_MEMPCPY:
- case BUILT_IN_STPCPY:
- case BUILT_IN_STPNCPY:
- case BUILT_IN_STRCAT:
- case BUILT_IN_STRNCAT:
- case BUILT_IN_STRCPY_CHK:
- case BUILT_IN_STRNCPY_CHK:
- case BUILT_IN_MEMCPY_CHK:
- case BUILT_IN_MEMMOVE_CHK:
- case BUILT_IN_MEMPCPY_CHK:
- case BUILT_IN_STPCPY_CHK:
- case BUILT_IN_STPNCPY_CHK:
- case BUILT_IN_STRCAT_CHK:
- case BUILT_IN_STRNCAT_CHK:
- case BUILT_IN_TM_MEMCPY:
- case BUILT_IN_TM_MEMMOVE:
- {
- tree res = gimple_call_lhs (t);
- tree dest = gimple_call_arg (t, (DECL_FUNCTION_CODE (fndecl)
- == BUILT_IN_BCOPY ? 1 : 0));
- tree src = gimple_call_arg (t, (DECL_FUNCTION_CODE (fndecl)
- == BUILT_IN_BCOPY ? 0 : 1));
- if (res != NULL_TREE)
- {
- get_constraint_for (res, &lhsc);
- if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_MEMPCPY
- || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STPCPY
- || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STPNCPY
- || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_MEMPCPY_CHK
- || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STPCPY_CHK
- || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STPNCPY_CHK)
- get_constraint_for_ptr_offset (dest, NULL_TREE, &rhsc);
- else
- get_constraint_for (dest, &rhsc);
- process_all_all_constraints (lhsc, rhsc);
- lhsc.truncate (0);
- rhsc.truncate (0);
- }
- get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc);
- get_constraint_for_ptr_offset (src, NULL_TREE, &rhsc);
- do_deref (&lhsc);
- do_deref (&rhsc);
- process_all_all_constraints (lhsc, rhsc);
- return true;
- }
- case BUILT_IN_MEMSET:
- case BUILT_IN_MEMSET_CHK:
- case BUILT_IN_TM_MEMSET:
- {
- tree res = gimple_call_lhs (t);
- tree dest = gimple_call_arg (t, 0);
- unsigned i;
- ce_s *lhsp;
- struct constraint_expr ac;
- if (res != NULL_TREE)
- {
- get_constraint_for (res, &lhsc);
- get_constraint_for (dest, &rhsc);
- process_all_all_constraints (lhsc, rhsc);
- lhsc.truncate (0);
- }
- get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc);
- do_deref (&lhsc);
- if (flag_delete_null_pointer_checks
- && integer_zerop (gimple_call_arg (t, 1)))
- {
- ac.type = ADDRESSOF;
- ac.var = nothing_id;
- }
- else
- {
- ac.type = SCALAR;
- ac.var = integer_id;
- }
- ac.offset = 0;
- FOR_EACH_VEC_ELT (lhsc, i, lhsp)
- process_constraint (new_constraint (*lhsp, ac));
- return true;
- }
- case BUILT_IN_STACK_SAVE:
- case BUILT_IN_STACK_RESTORE:
- /* Nothing interesting happens. */
- return true;
- case BUILT_IN_ALLOCA:
- case BUILT_IN_ALLOCA_WITH_ALIGN:
- case BUILT_IN_ALLOCA_WITH_ALIGN_AND_MAX:
- {
- tree ptr = gimple_call_lhs (t);
- if (ptr == NULL_TREE)
- return true;
- get_constraint_for (ptr, &lhsc);
- varinfo_t vi = make_heapvar ("HEAP", true);
- /* Alloca storage is never global. To exempt it from escaped
- handling make it a non-heap var. */
- DECL_EXTERNAL (vi->decl) = 0;
- vi->is_global_var = 0;
- vi->is_heap_var = 0;
- struct constraint_expr tmpc;
- tmpc.var = vi->id;
- tmpc.offset = 0;
- tmpc.type = ADDRESSOF;
- rhsc.safe_push (tmpc);
- process_all_all_constraints (lhsc, rhsc);
- return true;
- }
- case BUILT_IN_POSIX_MEMALIGN:
- {
- tree ptrptr = gimple_call_arg (t, 0);
- get_constraint_for (ptrptr, &lhsc);
- do_deref (&lhsc);
- varinfo_t vi = make_heapvar ("HEAP", true);
- /* We are marking allocated storage local, we deal with it becoming
- global by escaping and setting of vars_contains_escaped_heap. */
- DECL_EXTERNAL (vi->decl) = 0;
- vi->is_global_var = 0;
- struct constraint_expr tmpc;
- tmpc.var = vi->id;
- tmpc.offset = 0;
- tmpc.type = ADDRESSOF;
- rhsc.safe_push (tmpc);
- process_all_all_constraints (lhsc, rhsc);
- return true;
- }
- case BUILT_IN_ASSUME_ALIGNED:
- {
- tree res = gimple_call_lhs (t);
- tree dest = gimple_call_arg (t, 0);
- if (res != NULL_TREE)
- {
- get_constraint_for (res, &lhsc);
- get_constraint_for (dest, &rhsc);
- process_all_all_constraints (lhsc, rhsc);
- }
- return true;
- }
- /* All the following functions do not return pointers, do not
- modify the points-to sets of memory reachable from their
- arguments and do not add to the ESCAPED solution. */
- case BUILT_IN_SINCOS:
- case BUILT_IN_SINCOSF:
- case BUILT_IN_SINCOSL:
- case BUILT_IN_FREXP:
- case BUILT_IN_FREXPF:
- case BUILT_IN_FREXPL:
- case BUILT_IN_GAMMA_R:
- case BUILT_IN_GAMMAF_R:
- case BUILT_IN_GAMMAL_R:
- case BUILT_IN_LGAMMA_R:
- case BUILT_IN_LGAMMAF_R:
- case BUILT_IN_LGAMMAL_R:
- case BUILT_IN_MODF:
- case BUILT_IN_MODFF:
- case BUILT_IN_MODFL:
- case BUILT_IN_REMQUO:
- case BUILT_IN_REMQUOF:
- case BUILT_IN_REMQUOL:
- case BUILT_IN_FREE:
- return true;
- case BUILT_IN_STRDUP:
- case BUILT_IN_STRNDUP:
- case BUILT_IN_REALLOC:
- if (gimple_call_lhs (t))
- {
- auto_vec<ce_s> rhsc;
- handle_lhs_call (t, gimple_call_lhs (t),
- gimple_call_return_flags (t) | ERF_NOALIAS,
- rhsc, fndecl);
- get_constraint_for_ptr_offset (gimple_call_lhs (t),
- NULL_TREE, &lhsc);
- get_constraint_for_ptr_offset (gimple_call_arg (t, 0),
- NULL_TREE, &rhsc);
- do_deref (&lhsc);
- do_deref (&rhsc);
- process_all_all_constraints (lhsc, rhsc);
- lhsc.truncate (0);
- rhsc.truncate (0);
- /* For realloc the resulting pointer can be equal to the
- argument as well. But only doing this wouldn't be
- correct because with ptr == 0 realloc behaves like malloc. */
- if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_REALLOC)
- {
- get_constraint_for (gimple_call_lhs (t), &lhsc);
- get_constraint_for (gimple_call_arg (t, 0), &rhsc);
- process_all_all_constraints (lhsc, rhsc);
- }
- return true;
- }
- break;
- /* String / character search functions return a pointer into the
- source string or NULL. */
- case BUILT_IN_INDEX:
- case BUILT_IN_STRCHR:
- case BUILT_IN_STRRCHR:
- case BUILT_IN_MEMCHR:
- case BUILT_IN_STRSTR:
- case BUILT_IN_STRPBRK:
- if (gimple_call_lhs (t))
- {
- tree src = gimple_call_arg (t, 0);
- get_constraint_for_ptr_offset (src, NULL_TREE, &rhsc);
- constraint_expr nul;
- nul.var = nothing_id;
- nul.offset = 0;
- nul.type = ADDRESSOF;
- rhsc.safe_push (nul);
- get_constraint_for (gimple_call_lhs (t), &lhsc);
- process_all_all_constraints (lhsc, rhsc);
- }
- return true;
- /* Pure functions that return something not based on any object and
- that use the memory pointed to by their arguments (but not
- transitively). */
- case BUILT_IN_STRCMP:
- case BUILT_IN_STRCMP_EQ:
- case BUILT_IN_STRNCMP:
- case BUILT_IN_STRNCMP_EQ:
- case BUILT_IN_STRCASECMP:
- case BUILT_IN_STRNCASECMP:
- case BUILT_IN_MEMCMP:
- case BUILT_IN_BCMP:
- case BUILT_IN_STRSPN:
- case BUILT_IN_STRCSPN:
- {
- varinfo_t uses = get_call_use_vi (t);
- make_any_offset_constraints (uses);
- make_constraint_to (uses->id, gimple_call_arg (t, 0));
- make_constraint_to (uses->id, gimple_call_arg (t, 1));
- /* No constraints are necessary for the return value. */
- return true;
- }
- case BUILT_IN_STRLEN:
- {
- varinfo_t uses = get_call_use_vi (t);
- make_any_offset_constraints (uses);
- make_constraint_to (uses->id, gimple_call_arg (t, 0));
- /* No constraints are necessary for the return value. */
- return true;
- }
- case BUILT_IN_OBJECT_SIZE:
- case BUILT_IN_CONSTANT_P:
- {
- /* No constraints are necessary for the return value or the
- arguments. */
- return true;
- }
- /* Trampolines are special - they set up passing the static
- frame. */
- case BUILT_IN_INIT_TRAMPOLINE:
- {
- tree tramp = gimple_call_arg (t, 0);
- tree nfunc = gimple_call_arg (t, 1);
- tree frame = gimple_call_arg (t, 2);
- unsigned i;
- struct constraint_expr lhs, *rhsp;
- if (in_ipa_mode)
- {
- varinfo_t nfi = NULL;
- gcc_assert (TREE_CODE (nfunc) == ADDR_EXPR);
- nfi = lookup_vi_for_tree (TREE_OPERAND (nfunc, 0));
- if (nfi)
- {
- lhs = get_function_part_constraint (nfi, fi_static_chain);
- get_constraint_for (frame, &rhsc);
- FOR_EACH_VEC_ELT (rhsc, i, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- rhsc.truncate (0);
-
- /* Make the frame point to the function for
- the trampoline adjustment call. */
- get_constraint_for (tramp, &lhsc);
- do_deref (&lhsc);
- get_constraint_for (nfunc, &rhsc);
- process_all_all_constraints (lhsc, rhsc);
-
- return true;
- }
- }
- /* Else fallthru to generic handling which will let
- the frame escape. */
- break;
- }
- case BUILT_IN_ADJUST_TRAMPOLINE:
- {
- tree tramp = gimple_call_arg (t, 0);
- tree res = gimple_call_lhs (t);
- if (in_ipa_mode && res)
- {
- get_constraint_for (res, &lhsc);
- get_constraint_for (tramp, &rhsc);
- do_deref (&rhsc);
- process_all_all_constraints (lhsc, rhsc);
- }
- return true;
- }
- CASE_BUILT_IN_TM_STORE (1):
- CASE_BUILT_IN_TM_STORE (2):
- CASE_BUILT_IN_TM_STORE (4):
- CASE_BUILT_IN_TM_STORE (8):
- CASE_BUILT_IN_TM_STORE (FLOAT):
- CASE_BUILT_IN_TM_STORE (DOUBLE):
- CASE_BUILT_IN_TM_STORE (LDOUBLE):
- CASE_BUILT_IN_TM_STORE (M64):
- CASE_BUILT_IN_TM_STORE (M128):
- CASE_BUILT_IN_TM_STORE (M256):
- {
- tree addr = gimple_call_arg (t, 0);
- tree src = gimple_call_arg (t, 1);
-
- get_constraint_for (addr, &lhsc);
- do_deref (&lhsc);
- get_constraint_for (src, &rhsc);
- process_all_all_constraints (lhsc, rhsc);
- return true;
- }
- CASE_BUILT_IN_TM_LOAD (1):
- CASE_BUILT_IN_TM_LOAD (2):
- CASE_BUILT_IN_TM_LOAD (4):
- CASE_BUILT_IN_TM_LOAD (8):
- CASE_BUILT_IN_TM_LOAD (FLOAT):
- CASE_BUILT_IN_TM_LOAD (DOUBLE):
- CASE_BUILT_IN_TM_LOAD (LDOUBLE):
- CASE_BUILT_IN_TM_LOAD (M64):
- CASE_BUILT_IN_TM_LOAD (M128):
- CASE_BUILT_IN_TM_LOAD (M256):
- {
- tree dest = gimple_call_lhs (t);
- tree addr = gimple_call_arg (t, 0);
-
- get_constraint_for (dest, &lhsc);
- get_constraint_for (addr, &rhsc);
- do_deref (&rhsc);
- process_all_all_constraints (lhsc, rhsc);
- return true;
- }
- /* Variadic argument handling needs to be handled in IPA
- mode as well. */
- case BUILT_IN_VA_START:
- {
- tree valist = gimple_call_arg (t, 0);
- struct constraint_expr rhs, *lhsp;
- unsigned i;
- get_constraint_for_ptr_offset (valist, NULL_TREE, &lhsc);
- do_deref (&lhsc);
- /* The va_list gets access to pointers in variadic
- arguments. Which we know in the case of IPA analysis
- and otherwise are just all nonlocal variables. */
- if (in_ipa_mode)
- {
- fi = lookup_vi_for_tree (fn->decl);
- rhs = get_function_part_constraint (fi, ~0);
- rhs.type = ADDRESSOF;
- }
- else
- {
- rhs.var = nonlocal_id;
- rhs.type = ADDRESSOF;
- rhs.offset = 0;
- }
- FOR_EACH_VEC_ELT (lhsc, i, lhsp)
- process_constraint (new_constraint (*lhsp, rhs));
- /* va_list is clobbered. */
- make_constraint_to (get_call_clobber_vi (t)->id, valist);
- return true;
- }
- /* va_end doesn't have any effect that matters. */
- case BUILT_IN_VA_END:
- return true;
- /* Alternate return. Simply give up for now. */
- case BUILT_IN_RETURN:
- {
- fi = NULL;
- if (!in_ipa_mode
- || !(fi = get_vi_for_tree (fn->decl)))
- make_constraint_from (get_varinfo (escaped_id), anything_id);
- else if (in_ipa_mode
- && fi != NULL)
- {
- struct constraint_expr lhs, rhs;
- lhs = get_function_part_constraint (fi, fi_result);
- rhs.var = anything_id;
- rhs.offset = 0;
- rhs.type = SCALAR;
- process_constraint (new_constraint (lhs, rhs));
- }
- return true;
- }
- case BUILT_IN_GOMP_PARALLEL:
- case BUILT_IN_GOACC_PARALLEL:
- {
- if (in_ipa_mode)
- {
- unsigned int fnpos, argpos;
- switch (DECL_FUNCTION_CODE (fndecl))
- {
- case BUILT_IN_GOMP_PARALLEL:
- /* __builtin_GOMP_parallel (fn, data, num_threads, flags). */
- fnpos = 0;
- argpos = 1;
- break;
- case BUILT_IN_GOACC_PARALLEL:
- /* __builtin_GOACC_parallel (flags_m, fn, mapnum, hostaddrs,
- sizes, kinds, ...). */
- fnpos = 1;
- argpos = 3;
- break;
- default:
- gcc_unreachable ();
- }
-
- tree fnarg = gimple_call_arg (t, fnpos);
- gcc_assert (TREE_CODE (fnarg) == ADDR_EXPR);
- tree fndecl = TREE_OPERAND (fnarg, 0);
- if (fndecl_maybe_in_other_partition (fndecl))
- /* Fallthru to general call handling. */
- break;
-
- tree arg = gimple_call_arg (t, argpos);
-
- varinfo_t fi = get_vi_for_tree (fndecl);
- find_func_aliases_for_call_arg (fi, 0, arg);
- return true;
- }
- /* Else fallthru to generic call handling. */
- break;
- }
- /* printf-style functions may have hooks to set pointers to
- point to somewhere into the generated string. Leave them
- for a later exercise... */
- default:
- /* Fallthru to general call handling. */;
- }
-
- return false;
-}
-
-/* Create constraints for the call T. */
-
-static void
-find_func_aliases_for_call (struct function *fn, gcall *t)
-{
- tree fndecl = gimple_call_fndecl (t);
- varinfo_t fi;
-
- if (fndecl != NULL_TREE
- && fndecl_built_in_p (fndecl)
- && find_func_aliases_for_builtin_call (fn, t))
- return;
-
- if (gimple_call_internal_p (t, IFN_DEFERRED_INIT))
- return;
-
- fi = get_fi_for_callee (t);
- if (!in_ipa_mode
- || (fi->decl && fndecl && !fi->is_fn_info))
- {
- auto_vec<ce_s, 16> rhsc;
- int flags = gimple_call_flags (t);
-
- /* Const functions can return their arguments and addresses
- of global memory but not of escaped memory. */
- if (flags & (ECF_CONST|ECF_NOVOPS))
- {
- if (gimple_call_lhs (t))
- handle_rhs_call (t, &rhsc, implicit_const_eaf_flags, false, false);
- }
- /* Pure functions can return addresses in and of memory
- reachable from their arguments, but they are not an escape
- point for reachable memory of their arguments. */
- else if (flags & (ECF_PURE|ECF_LOOPING_CONST_OR_PURE))
- handle_rhs_call (t, &rhsc, implicit_pure_eaf_flags, false, true);
- /* If the call is to a replaceable operator delete and results
- from a delete expression as opposed to a direct call to
- such operator, then the effects for PTA (in particular
- the escaping of the pointer) can be ignored. */
- else if (fndecl
- && DECL_IS_OPERATOR_DELETE_P (fndecl)
- && gimple_call_from_new_or_delete (t))
- ;
- else
- handle_rhs_call (t, &rhsc, 0, true, true);
- if (gimple_call_lhs (t))
- handle_lhs_call (t, gimple_call_lhs (t),
- gimple_call_return_flags (t), rhsc, fndecl);
- }
- else
- {
- auto_vec<ce_s, 2> rhsc;
- tree lhsop;
- unsigned j;
-
- /* Assign all the passed arguments to the appropriate incoming
- parameters of the function. */
- for (j = 0; j < gimple_call_num_args (t); j++)
- {
- tree arg = gimple_call_arg (t, j);
- find_func_aliases_for_call_arg (fi, j, arg);
- }
-
- /* If we are returning a value, assign it to the result. */
- lhsop = gimple_call_lhs (t);
- if (lhsop)
- {
- auto_vec<ce_s, 2> lhsc;
- struct constraint_expr rhs;
- struct constraint_expr *lhsp;
- bool aggr_p = aggregate_value_p (lhsop, gimple_call_fntype (t));
-
- get_constraint_for (lhsop, &lhsc);
- rhs = get_function_part_constraint (fi, fi_result);
- if (aggr_p)
- {
- auto_vec<ce_s, 2> tem;
- tem.quick_push (rhs);
- do_deref (&tem);
- gcc_checking_assert (tem.length () == 1);
- rhs = tem[0];
- }
- FOR_EACH_VEC_ELT (lhsc, j, lhsp)
- process_constraint (new_constraint (*lhsp, rhs));
-
- /* If we pass the result decl by reference, honor that. */
- if (aggr_p)
- {
- struct constraint_expr lhs;
- struct constraint_expr *rhsp;
-
- get_constraint_for_address_of (lhsop, &rhsc);
- lhs = get_function_part_constraint (fi, fi_result);
- FOR_EACH_VEC_ELT (rhsc, j, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- rhsc.truncate (0);
- }
- }
-
- /* If we use a static chain, pass it along. */
- if (gimple_call_chain (t))
- {
- struct constraint_expr lhs;
- struct constraint_expr *rhsp;
-
- get_constraint_for (gimple_call_chain (t), &rhsc);
- lhs = get_function_part_constraint (fi, fi_static_chain);
- FOR_EACH_VEC_ELT (rhsc, j, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- }
- }
-}
-
-/* Walk statement T setting up aliasing constraints according to the
- references found in T. This function is the main part of the
- constraint builder. AI points to auxiliary alias information used
- when building alias sets and computing alias grouping heuristics. */
-
-static void
-find_func_aliases (struct function *fn, gimple *origt)
-{
- gimple *t = origt;
- auto_vec<ce_s, 16> lhsc;
- auto_vec<ce_s, 16> rhsc;
- varinfo_t fi;
-
- /* Now build constraints expressions. */
- if (gimple_code (t) == GIMPLE_PHI)
- {
- /* For a phi node, assign all the arguments to
- the result. */
- get_constraint_for (gimple_phi_result (t), &lhsc);
- for (unsigned i = 0; i < gimple_phi_num_args (t); i++)
- {
- get_constraint_for_rhs (gimple_phi_arg_def (t, i), &rhsc);
- process_all_all_constraints (lhsc, rhsc);
- rhsc.truncate (0);
- }
- }
- /* In IPA mode, we need to generate constraints to pass call
- arguments through their calls. There are two cases,
- either a GIMPLE_CALL returning a value, or just a plain
- GIMPLE_CALL when we are not.
-
- In non-ipa mode, we need to generate constraints for each
- pointer passed by address. */
- else if (is_gimple_call (t))
- find_func_aliases_for_call (fn, as_a <gcall *> (t));
-
- /* Otherwise, just a regular assignment statement. Only care about
- operations with pointer result, others are dealt with as escape
- points if they have pointer operands. */
- else if (is_gimple_assign (t))
- {
- /* Otherwise, just a regular assignment statement. */
- tree lhsop = gimple_assign_lhs (t);
- tree rhsop = (gimple_num_ops (t) == 2) ? gimple_assign_rhs1 (t) : NULL;
-
- if (rhsop && TREE_CLOBBER_P (rhsop))
- /* Ignore clobbers, they don't actually store anything into
- the LHS. */
- ;
- else if (rhsop && AGGREGATE_TYPE_P (TREE_TYPE (lhsop)))
- do_structure_copy (lhsop, rhsop);
- else
- {
- enum tree_code code = gimple_assign_rhs_code (t);
-
- get_constraint_for (lhsop, &lhsc);
-
- if (code == POINTER_PLUS_EXPR)
- get_constraint_for_ptr_offset (gimple_assign_rhs1 (t),
- gimple_assign_rhs2 (t), &rhsc);
- else if (code == POINTER_DIFF_EXPR)
- /* The result is not a pointer (part). */
- ;
- else if (code == BIT_AND_EXPR
- && TREE_CODE (gimple_assign_rhs2 (t)) == INTEGER_CST)
- {
- /* Aligning a pointer via a BIT_AND_EXPR is offsetting
- the pointer. Handle it by offsetting it by UNKNOWN. */
- get_constraint_for_ptr_offset (gimple_assign_rhs1 (t),
- NULL_TREE, &rhsc);
- }
- else if (code == TRUNC_DIV_EXPR
- || code == CEIL_DIV_EXPR
- || code == FLOOR_DIV_EXPR
- || code == ROUND_DIV_EXPR
- || code == EXACT_DIV_EXPR
- || code == TRUNC_MOD_EXPR
- || code == CEIL_MOD_EXPR
- || code == FLOOR_MOD_EXPR
- || code == ROUND_MOD_EXPR)
- /* Division and modulo transfer the pointer from the LHS. */
- get_constraint_for_ptr_offset (gimple_assign_rhs1 (t),
- NULL_TREE, &rhsc);
- else if (CONVERT_EXPR_CODE_P (code)
- || gimple_assign_single_p (t))
- /* See through conversions, single RHS are handled by
- get_constraint_for_rhs. */
- get_constraint_for_rhs (rhsop, &rhsc);
- else if (code == COND_EXPR)
- {
- /* The result is a merge of both COND_EXPR arms. */
- auto_vec<ce_s, 2> tmp;
- struct constraint_expr *rhsp;
- unsigned i;
- get_constraint_for_rhs (gimple_assign_rhs2 (t), &rhsc);
- get_constraint_for_rhs (gimple_assign_rhs3 (t), &tmp);
- FOR_EACH_VEC_ELT (tmp, i, rhsp)
- rhsc.safe_push (*rhsp);
- }
- else if (truth_value_p (code))
- /* Truth value results are not pointer (parts). Or at least
- very unreasonable obfuscation of a part. */
- ;
- else
- {
- /* All other operations are possibly offsetting merges. */
- auto_vec<ce_s, 4> tmp;
- struct constraint_expr *rhsp;
- unsigned i, j;
- get_constraint_for_ptr_offset (gimple_assign_rhs1 (t),
- NULL_TREE, &rhsc);
- for (i = 2; i < gimple_num_ops (t); ++i)
- {
- get_constraint_for_ptr_offset (gimple_op (t, i),
- NULL_TREE, &tmp);
- FOR_EACH_VEC_ELT (tmp, j, rhsp)
- rhsc.safe_push (*rhsp);
- tmp.truncate (0);
- }
- }
- process_all_all_constraints (lhsc, rhsc);
- }
- /* If there is a store to a global variable the rhs escapes. */
- if ((lhsop = get_base_address (lhsop)) != NULL_TREE
- && DECL_P (lhsop))
- {
- varinfo_t vi = get_vi_for_tree (lhsop);
- if ((! in_ipa_mode && vi->is_global_var)
- || vi->is_ipa_escape_point)
- make_escape_constraint (rhsop);
- }
- }
- /* Handle escapes through return. */
- else if (gimple_code (t) == GIMPLE_RETURN
- && gimple_return_retval (as_a <greturn *> (t)) != NULL_TREE)
- {
- greturn *return_stmt = as_a <greturn *> (t);
- fi = NULL;
- if (!in_ipa_mode
- && SSA_VAR_P (gimple_return_retval (return_stmt)))
- {
- /* We handle simple returns by post-processing the solutions. */
- ;
- }
- if (!(fi = get_vi_for_tree (fn->decl)))
- make_escape_constraint (gimple_return_retval (return_stmt));
- else if (in_ipa_mode)
- {
- struct constraint_expr lhs ;
- struct constraint_expr *rhsp;
- unsigned i;
-
- lhs = get_function_part_constraint (fi, fi_result);
- get_constraint_for_rhs (gimple_return_retval (return_stmt), &rhsc);
- FOR_EACH_VEC_ELT (rhsc, i, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- }
- }
- /* Handle asms conservatively by adding escape constraints to everything. */
- else if (gasm *asm_stmt = dyn_cast <gasm *> (t))
- {
- unsigned i, noutputs;
- const char **oconstraints;
- const char *constraint;
- bool allows_mem, allows_reg, is_inout;
-
- noutputs = gimple_asm_noutputs (asm_stmt);
- oconstraints = XALLOCAVEC (const char *, noutputs);
-
- for (i = 0; i < noutputs; ++i)
- {
- tree link = gimple_asm_output_op (asm_stmt, i);
- tree op = TREE_VALUE (link);
-
- constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
- oconstraints[i] = constraint;
- parse_output_constraint (&constraint, i, 0, 0, &allows_mem,
- &allows_reg, &is_inout);
-
- /* A memory constraint makes the address of the operand escape. */
- if (!allows_reg && allows_mem)
- make_escape_constraint (build_fold_addr_expr (op));
-
- /* The asm may read global memory, so outputs may point to
- any global memory. */
- if (op)
- {
- auto_vec<ce_s, 2> lhsc;
- struct constraint_expr rhsc, *lhsp;
- unsigned j;
- get_constraint_for (op, &lhsc);
- rhsc.var = nonlocal_id;
- rhsc.offset = 0;
- rhsc.type = SCALAR;
- FOR_EACH_VEC_ELT (lhsc, j, lhsp)
- process_constraint (new_constraint (*lhsp, rhsc));
- }
- }
- for (i = 0; i < gimple_asm_ninputs (asm_stmt); ++i)
- {
- tree link = gimple_asm_input_op (asm_stmt, i);
- tree op = TREE_VALUE (link);
-
- constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
-
- parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints,
- &allows_mem, &allows_reg);
-
- /* A memory constraint makes the address of the operand escape. */
- if (!allows_reg && allows_mem)
- make_escape_constraint (build_fold_addr_expr (op));
- /* Strictly we'd only need the constraint to ESCAPED if
- the asm clobbers memory, otherwise using something
- along the lines of per-call clobbers/uses would be enough. */
- else if (op)
- make_escape_constraint (op);
- }
- }
-}
-
-
-/* Create a constraint adding to the clobber set of FI the memory
- pointed to by PTR. */
-
-static void
-process_ipa_clobber (varinfo_t fi, tree ptr)
-{
- vec<ce_s> ptrc = vNULL;
- struct constraint_expr *c, lhs;
- unsigned i;
- get_constraint_for_rhs (ptr, &ptrc);
- lhs = get_function_part_constraint (fi, fi_clobbers);
- FOR_EACH_VEC_ELT (ptrc, i, c)
- process_constraint (new_constraint (lhs, *c));
- ptrc.release ();
-}
-
-/* Walk statement T setting up clobber and use constraints according to the
- references found in T. This function is a main part of the
- IPA constraint builder. */
-
-static void
-find_func_clobbers (struct function *fn, gimple *origt)
-{
- gimple *t = origt;
- auto_vec<ce_s, 16> lhsc;
- auto_vec<ce_s, 16> rhsc;
- varinfo_t fi;
-
- /* Add constraints for clobbered/used in IPA mode.
- We are not interested in what automatic variables are clobbered
- or used as we only use the information in the caller to which
- they do not escape. */
- gcc_assert (in_ipa_mode);
-
- /* If the stmt refers to memory in any way it better had a VUSE. */
- if (gimple_vuse (t) == NULL_TREE)
- return;
-
- /* We'd better have function information for the current function. */
- fi = lookup_vi_for_tree (fn->decl);
- gcc_assert (fi != NULL);
-
- /* Account for stores in assignments and calls. */
- if (gimple_vdef (t) != NULL_TREE
- && gimple_has_lhs (t))
- {
- tree lhs = gimple_get_lhs (t);
- tree tem = lhs;
- while (handled_component_p (tem))
- tem = TREE_OPERAND (tem, 0);
- if ((DECL_P (tem)
- && !auto_var_in_fn_p (tem, fn->decl))
- || INDIRECT_REF_P (tem)
- || (TREE_CODE (tem) == MEM_REF
- && !(TREE_CODE (TREE_OPERAND (tem, 0)) == ADDR_EXPR
- && auto_var_in_fn_p
- (TREE_OPERAND (TREE_OPERAND (tem, 0), 0), fn->decl))))
- {
- struct constraint_expr lhsc, *rhsp;
- unsigned i;
- lhsc = get_function_part_constraint (fi, fi_clobbers);
- get_constraint_for_address_of (lhs, &rhsc);
- FOR_EACH_VEC_ELT (rhsc, i, rhsp)
- process_constraint (new_constraint (lhsc, *rhsp));
- rhsc.truncate (0);
- }
- }
-
- /* Account for uses in assigments and returns. */
- if (gimple_assign_single_p (t)
- || (gimple_code (t) == GIMPLE_RETURN
- && gimple_return_retval (as_a <greturn *> (t)) != NULL_TREE))
- {
- tree rhs = (gimple_assign_single_p (t)
- ? gimple_assign_rhs1 (t)
- : gimple_return_retval (as_a <greturn *> (t)));
- tree tem = rhs;
- while (handled_component_p (tem))
- tem = TREE_OPERAND (tem, 0);
- if ((DECL_P (tem)
- && !auto_var_in_fn_p (tem, fn->decl))
- || INDIRECT_REF_P (tem)
- || (TREE_CODE (tem) == MEM_REF
- && !(TREE_CODE (TREE_OPERAND (tem, 0)) == ADDR_EXPR
- && auto_var_in_fn_p
- (TREE_OPERAND (TREE_OPERAND (tem, 0), 0), fn->decl))))
- {
- struct constraint_expr lhs, *rhsp;
- unsigned i;
- lhs = get_function_part_constraint (fi, fi_uses);
- get_constraint_for_address_of (rhs, &rhsc);
- FOR_EACH_VEC_ELT (rhsc, i, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- rhsc.truncate (0);
- }
- }
-
- if (gcall *call_stmt = dyn_cast <gcall *> (t))
- {
- varinfo_t cfi = NULL;
- tree decl = gimple_call_fndecl (t);
- struct constraint_expr lhs, rhs;
- unsigned i, j;
-
- /* For builtins we do not have separate function info. For those
- we do not generate escapes for we have to generate clobbers/uses. */
- if (gimple_call_builtin_p (t, BUILT_IN_NORMAL))
- switch (DECL_FUNCTION_CODE (decl))
- {
- /* The following functions use and clobber memory pointed to
- by their arguments. */
- case BUILT_IN_STRCPY:
- case BUILT_IN_STRNCPY:
- case BUILT_IN_BCOPY:
- case BUILT_IN_MEMCPY:
- case BUILT_IN_MEMMOVE:
- case BUILT_IN_MEMPCPY:
- case BUILT_IN_STPCPY:
- case BUILT_IN_STPNCPY:
- case BUILT_IN_STRCAT:
- case BUILT_IN_STRNCAT:
- case BUILT_IN_STRCPY_CHK:
- case BUILT_IN_STRNCPY_CHK:
- case BUILT_IN_MEMCPY_CHK:
- case BUILT_IN_MEMMOVE_CHK:
- case BUILT_IN_MEMPCPY_CHK:
- case BUILT_IN_STPCPY_CHK:
- case BUILT_IN_STPNCPY_CHK:
- case BUILT_IN_STRCAT_CHK:
- case BUILT_IN_STRNCAT_CHK:
- {
- tree dest = gimple_call_arg (t, (DECL_FUNCTION_CODE (decl)
- == BUILT_IN_BCOPY ? 1 : 0));
- tree src = gimple_call_arg (t, (DECL_FUNCTION_CODE (decl)
- == BUILT_IN_BCOPY ? 0 : 1));
- unsigned i;
- struct constraint_expr *rhsp, *lhsp;
- get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc);
- lhs = get_function_part_constraint (fi, fi_clobbers);
- FOR_EACH_VEC_ELT (lhsc, i, lhsp)
- process_constraint (new_constraint (lhs, *lhsp));
- get_constraint_for_ptr_offset (src, NULL_TREE, &rhsc);
- lhs = get_function_part_constraint (fi, fi_uses);
- FOR_EACH_VEC_ELT (rhsc, i, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- return;
- }
- /* The following function clobbers memory pointed to by
- its argument. */
- case BUILT_IN_MEMSET:
- case BUILT_IN_MEMSET_CHK:
- case BUILT_IN_POSIX_MEMALIGN:
- {
- tree dest = gimple_call_arg (t, 0);
- unsigned i;
- ce_s *lhsp;
- get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc);
- lhs = get_function_part_constraint (fi, fi_clobbers);
- FOR_EACH_VEC_ELT (lhsc, i, lhsp)
- process_constraint (new_constraint (lhs, *lhsp));
- return;
- }
- /* The following functions clobber their second and third
- arguments. */
- case BUILT_IN_SINCOS:
- case BUILT_IN_SINCOSF:
- case BUILT_IN_SINCOSL:
- {
- process_ipa_clobber (fi, gimple_call_arg (t, 1));
- process_ipa_clobber (fi, gimple_call_arg (t, 2));
- return;
- }
- /* The following functions clobber their second argument. */
- case BUILT_IN_FREXP:
- case BUILT_IN_FREXPF:
- case BUILT_IN_FREXPL:
- case BUILT_IN_LGAMMA_R:
- case BUILT_IN_LGAMMAF_R:
- case BUILT_IN_LGAMMAL_R:
- case BUILT_IN_GAMMA_R:
- case BUILT_IN_GAMMAF_R:
- case BUILT_IN_GAMMAL_R:
- case BUILT_IN_MODF:
- case BUILT_IN_MODFF:
- case BUILT_IN_MODFL:
- {
- process_ipa_clobber (fi, gimple_call_arg (t, 1));
- return;
- }
- /* The following functions clobber their third argument. */
- case BUILT_IN_REMQUO:
- case BUILT_IN_REMQUOF:
- case BUILT_IN_REMQUOL:
- {
- process_ipa_clobber (fi, gimple_call_arg (t, 2));
- return;
- }
- /* The following functions neither read nor clobber memory. */
- case BUILT_IN_ASSUME_ALIGNED:
- case BUILT_IN_FREE:
- return;
- /* Trampolines are of no interest to us. */
- case BUILT_IN_INIT_TRAMPOLINE:
- case BUILT_IN_ADJUST_TRAMPOLINE:
- return;
- case BUILT_IN_VA_START:
- case BUILT_IN_VA_END:
- return;
- case BUILT_IN_GOMP_PARALLEL:
- case BUILT_IN_GOACC_PARALLEL:
- {
- unsigned int fnpos, argpos;
- unsigned int implicit_use_args[2];
- unsigned int num_implicit_use_args = 0;
- switch (DECL_FUNCTION_CODE (decl))
- {
- case BUILT_IN_GOMP_PARALLEL:
- /* __builtin_GOMP_parallel (fn, data, num_threads, flags). */
- fnpos = 0;
- argpos = 1;
- break;
- case BUILT_IN_GOACC_PARALLEL:
- /* __builtin_GOACC_parallel (flags_m, fn, mapnum, hostaddrs,
- sizes, kinds, ...). */
- fnpos = 1;
- argpos = 3;
- implicit_use_args[num_implicit_use_args++] = 4;
- implicit_use_args[num_implicit_use_args++] = 5;
- break;
- default:
- gcc_unreachable ();
- }
-
- tree fnarg = gimple_call_arg (t, fnpos);
- gcc_assert (TREE_CODE (fnarg) == ADDR_EXPR);
- tree fndecl = TREE_OPERAND (fnarg, 0);
- if (fndecl_maybe_in_other_partition (fndecl))
- /* Fallthru to general call handling. */
- break;
-
- varinfo_t cfi = get_vi_for_tree (fndecl);
-
- tree arg = gimple_call_arg (t, argpos);
-
- /* Parameter passed by value is used. */
- lhs = get_function_part_constraint (fi, fi_uses);
- struct constraint_expr *rhsp;
- get_constraint_for (arg, &rhsc);
- FOR_EACH_VEC_ELT (rhsc, j, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- rhsc.truncate (0);
-
- /* Handle parameters used by the call, but not used in cfi, as
- implicitly used by cfi. */
- lhs = get_function_part_constraint (cfi, fi_uses);
- for (unsigned i = 0; i < num_implicit_use_args; ++i)
- {
- tree arg = gimple_call_arg (t, implicit_use_args[i]);
- get_constraint_for (arg, &rhsc);
- FOR_EACH_VEC_ELT (rhsc, j, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- rhsc.truncate (0);
- }
-
- /* The caller clobbers what the callee does. */
- lhs = get_function_part_constraint (fi, fi_clobbers);
- rhs = get_function_part_constraint (cfi, fi_clobbers);
- process_constraint (new_constraint (lhs, rhs));
-
- /* The caller uses what the callee does. */
- lhs = get_function_part_constraint (fi, fi_uses);
- rhs = get_function_part_constraint (cfi, fi_uses);
- process_constraint (new_constraint (lhs, rhs));
-
- return;
- }
- /* printf-style functions may have hooks to set pointers to
- point to somewhere into the generated string. Leave them
- for a later exercise... */
- default:
- /* Fallthru to general call handling. */;
- }
-
- /* Parameters passed by value are used. */
- lhs = get_function_part_constraint (fi, fi_uses);
- for (i = 0; i < gimple_call_num_args (t); i++)
- {
- struct constraint_expr *rhsp;
- tree arg = gimple_call_arg (t, i);
-
- if (TREE_CODE (arg) == SSA_NAME
- || is_gimple_min_invariant (arg))
- continue;
-
- get_constraint_for_address_of (arg, &rhsc);
- FOR_EACH_VEC_ELT (rhsc, j, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- rhsc.truncate (0);
- }
-
- /* Build constraints for propagating clobbers/uses along the
- callgraph edges. */
- cfi = get_fi_for_callee (call_stmt);
- if (cfi->id == anything_id)
- {
- if (gimple_vdef (t))
- make_constraint_from (first_vi_for_offset (fi, fi_clobbers),
- anything_id);
- make_constraint_from (first_vi_for_offset (fi, fi_uses),
- anything_id);
- return;
- }
-
- /* For callees without function info (that's external functions),
- ESCAPED is clobbered and used. */
- if (cfi->decl
- && TREE_CODE (cfi->decl) == FUNCTION_DECL
- && !cfi->is_fn_info)
- {
- varinfo_t vi;
-
- if (gimple_vdef (t))
- make_copy_constraint (first_vi_for_offset (fi, fi_clobbers),
- escaped_id);
- make_copy_constraint (first_vi_for_offset (fi, fi_uses), escaped_id);
-
- /* Also honor the call statement use/clobber info. */
- if ((vi = lookup_call_clobber_vi (call_stmt)) != NULL)
- make_copy_constraint (first_vi_for_offset (fi, fi_clobbers),
- vi->id);
- if ((vi = lookup_call_use_vi (call_stmt)) != NULL)
- make_copy_constraint (first_vi_for_offset (fi, fi_uses),
- vi->id);
- return;
- }
-
- /* Otherwise the caller clobbers and uses what the callee does.
- ??? This should use a new complex constraint that filters
- local variables of the callee. */
- if (gimple_vdef (t))
- {
- lhs = get_function_part_constraint (fi, fi_clobbers);
- rhs = get_function_part_constraint (cfi, fi_clobbers);
- process_constraint (new_constraint (lhs, rhs));
- }
- lhs = get_function_part_constraint (fi, fi_uses);
- rhs = get_function_part_constraint (cfi, fi_uses);
- process_constraint (new_constraint (lhs, rhs));
- }
- else if (gimple_code (t) == GIMPLE_ASM)
- {
- /* ??? Ick. We can do better. */
- if (gimple_vdef (t))
- make_constraint_from (first_vi_for_offset (fi, fi_clobbers),
- anything_id);
- make_constraint_from (first_vi_for_offset (fi, fi_uses),
- anything_id);
- }
-}
-
-
-/* Find the first varinfo in the same variable as START that overlaps with
- OFFSET. Return NULL if we can't find one. */
-
-static varinfo_t
-first_vi_for_offset (varinfo_t start, unsigned HOST_WIDE_INT offset)
-{
- /* If the offset is outside of the variable, bail out. */
- if (offset >= start->fullsize)
- return NULL;
-
- /* If we cannot reach offset from start, lookup the first field
- and start from there. */
- if (start->offset > offset)
- start = get_varinfo (start->head);
-
- while (start)
- {
- /* We may not find a variable in the field list with the actual
- offset when we have glommed a structure to a variable.
- In that case, however, offset should still be within the size
- of the variable. */
- if (offset >= start->offset
- && (offset - start->offset) < start->size)
- return start;
-
- start = vi_next (start);
- }
-
- return NULL;
-}
-
-/* Find the first varinfo in the same variable as START that overlaps with
- OFFSET. If there is no such varinfo the varinfo directly preceding
- OFFSET is returned. */
-
-static varinfo_t
-first_or_preceding_vi_for_offset (varinfo_t start,
- unsigned HOST_WIDE_INT offset)
-{
- /* If we cannot reach offset from start, lookup the first field
- and start from there. */
- if (start->offset > offset)
- start = get_varinfo (start->head);
-
- /* We may not find a variable in the field list with the actual
- offset when we have glommed a structure to a variable.
- In that case, however, offset should still be within the size
- of the variable.
- If we got beyond the offset we look for return the field
- directly preceding offset which may be the last field. */
- while (start->next
- && offset >= start->offset
- && !((offset - start->offset) < start->size))
- start = vi_next (start);
-
- return start;
-}
-
-
-/* This structure is used during pushing fields onto the fieldstack
- to track the offset of the field, since bitpos_of_field gives it
- relative to its immediate containing type, and we want it relative
- to the ultimate containing object. */
-
-struct fieldoff
-{
- /* Offset from the base of the base containing object to this field. */
- HOST_WIDE_INT offset;
-
- /* Size, in bits, of the field. */
- unsigned HOST_WIDE_INT size;
-
- unsigned has_unknown_size : 1;
-
- unsigned must_have_pointers : 1;
-
- unsigned may_have_pointers : 1;
-
- unsigned only_restrict_pointers : 1;
-
- tree restrict_pointed_type;
-};
-typedef struct fieldoff fieldoff_s;
-
-
-/* qsort comparison function for two fieldoff's PA and PB */
-
-static int
-fieldoff_compare (const void *pa, const void *pb)
-{
- const fieldoff_s *foa = (const fieldoff_s *)pa;
- const fieldoff_s *fob = (const fieldoff_s *)pb;
- unsigned HOST_WIDE_INT foasize, fobsize;
-
- if (foa->offset < fob->offset)
- return -1;
- else if (foa->offset > fob->offset)
- return 1;
-
- foasize = foa->size;
- fobsize = fob->size;
- if (foasize < fobsize)
- return -1;
- else if (foasize > fobsize)
- return 1;
- return 0;
-}
-
-/* Sort a fieldstack according to the field offset and sizes. */
-static void
-sort_fieldstack (vec<fieldoff_s> &fieldstack)
-{
- fieldstack.qsort (fieldoff_compare);
-}
-
-/* Return true if T is a type that can have subvars. */
-
-static inline bool
-type_can_have_subvars (const_tree t)
-{
- /* Aggregates without overlapping fields can have subvars. */
- return TREE_CODE (t) == RECORD_TYPE;
-}
-
-/* Return true if V is a tree that we can have subvars for.
- Normally, this is any aggregate type. Also complex
- types which are not gimple registers can have subvars. */
-
-static inline bool
-var_can_have_subvars (const_tree v)
-{
- /* Volatile variables should never have subvars. */
- if (TREE_THIS_VOLATILE (v))
- return false;
-
- /* Non decls or memory tags can never have subvars. */
- if (!DECL_P (v))
- return false;
-
- return type_can_have_subvars (TREE_TYPE (v));
-}
-
-/* Return true if T is a type that does contain pointers. */
-
-static bool
-type_must_have_pointers (tree type)
-{
- if (POINTER_TYPE_P (type))
- return true;
-
- if (TREE_CODE (type) == ARRAY_TYPE)
- return type_must_have_pointers (TREE_TYPE (type));
-
- /* A function or method can have pointers as arguments, so track
- those separately. */
- if (TREE_CODE (type) == FUNCTION_TYPE
- || TREE_CODE (type) == METHOD_TYPE)
- return true;
-
- return false;
-}
-
-static bool
-field_must_have_pointers (tree t)
-{
- return type_must_have_pointers (TREE_TYPE (t));
-}
-
-/* Given a TYPE, and a vector of field offsets FIELDSTACK, push all
- the fields of TYPE onto fieldstack, recording their offsets along
- the way.
-
- OFFSET is used to keep track of the offset in this entire
- structure, rather than just the immediately containing structure.
- Returns false if the caller is supposed to handle the field we
- recursed for. */
-
-static bool
-push_fields_onto_fieldstack (tree type, vec<fieldoff_s> *fieldstack,
- HOST_WIDE_INT offset)
-{
- tree field;
- bool empty_p = true;
-
- if (TREE_CODE (type) != RECORD_TYPE)
- return false;
-
- /* If the vector of fields is growing too big, bail out early.
- Callers check for vec::length <= param_max_fields_for_field_sensitive, make
- sure this fails. */
- if (fieldstack->length () > (unsigned)param_max_fields_for_field_sensitive)
- return false;
-
- for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
- if (TREE_CODE (field) == FIELD_DECL)
- {
- bool push = false;
- HOST_WIDE_INT foff = bitpos_of_field (field);
- tree field_type = TREE_TYPE (field);
-
- if (!var_can_have_subvars (field)
- || TREE_CODE (field_type) == QUAL_UNION_TYPE
- || TREE_CODE (field_type) == UNION_TYPE)
- push = true;
- else if (!push_fields_onto_fieldstack
- (field_type, fieldstack, offset + foff)
- && (DECL_SIZE (field)
- && !integer_zerop (DECL_SIZE (field))))
- /* Empty structures may have actual size, like in C++. So
- see if we didn't push any subfields and the size is
- nonzero, push the field onto the stack. */
- push = true;
-
- if (push)
- {
- fieldoff_s *pair = NULL;
- bool has_unknown_size = false;
- bool must_have_pointers_p;
-
- if (!fieldstack->is_empty ())
- pair = &fieldstack->last ();
-
- /* If there isn't anything at offset zero, create sth. */
- if (!pair
- && offset + foff != 0)
- {
- fieldoff_s e
- = {0, offset + foff, false, false, true, false, NULL_TREE};
- pair = fieldstack->safe_push (e);
- }
-
- if (!DECL_SIZE (field)
- || !tree_fits_uhwi_p (DECL_SIZE (field)))
- has_unknown_size = true;
-
- /* If adjacent fields do not contain pointers merge them. */
- must_have_pointers_p = field_must_have_pointers (field);
- if (pair
- && !has_unknown_size
- && !must_have_pointers_p
- && !pair->must_have_pointers
- && !pair->has_unknown_size
- && pair->offset + (HOST_WIDE_INT)pair->size == offset + foff)
- {
- pair->size += tree_to_uhwi (DECL_SIZE (field));
- }
- else
- {
- fieldoff_s e;
- e.offset = offset + foff;
- e.has_unknown_size = has_unknown_size;
- if (!has_unknown_size)
- e.size = tree_to_uhwi (DECL_SIZE (field));
- else
- e.size = -1;
- e.must_have_pointers = must_have_pointers_p;
- e.may_have_pointers = true;
- e.only_restrict_pointers
- = (!has_unknown_size
- && POINTER_TYPE_P (field_type)
- && TYPE_RESTRICT (field_type));
- if (e.only_restrict_pointers)
- e.restrict_pointed_type = TREE_TYPE (field_type);
- fieldstack->safe_push (e);
- }
- }
-
- empty_p = false;
- }
-
- return !empty_p;
-}
-
-/* Count the number of arguments DECL has, and set IS_VARARGS to true
- if it is a varargs function. */
-
-static unsigned int
-count_num_arguments (tree decl, bool *is_varargs)
-{
- unsigned int num = 0;
- tree t;
-
- /* Capture named arguments for K&R functions. They do not
- have a prototype and thus no TYPE_ARG_TYPES. */
- for (t = DECL_ARGUMENTS (decl); t; t = DECL_CHAIN (t))
- ++num;
-
- /* Check if the function has variadic arguments. */
- for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
- if (TREE_VALUE (t) == void_type_node)
- break;
- if (!t)
- *is_varargs = true;
-
- return num;
-}
-
-/* Creation function node for DECL, using NAME, and return the index
- of the variable we've created for the function. If NONLOCAL_p, create
- initial constraints. */
-
-static varinfo_t
-create_function_info_for (tree decl, const char *name, bool add_id,
- bool nonlocal_p)
-{
- struct function *fn = DECL_STRUCT_FUNCTION (decl);
- varinfo_t vi, prev_vi;
- tree arg;
- unsigned int i;
- bool is_varargs = false;
- unsigned int num_args = count_num_arguments (decl, &is_varargs);
-
- /* Create the variable info. */
-
- vi = new_var_info (decl, name, add_id);
- vi->offset = 0;
- vi->size = 1;
- vi->fullsize = fi_parm_base + num_args;
- vi->is_fn_info = 1;
- vi->may_have_pointers = false;
- if (is_varargs)
- vi->fullsize = ~0;
- insert_vi_for_tree (vi->decl, vi);
-
- prev_vi = vi;
-
- /* Create a variable for things the function clobbers and one for
- things the function uses. */
- {
- varinfo_t clobbervi, usevi;
- const char *newname;
- char *tempname;
-
- tempname = xasprintf ("%s.clobber", name);
- newname = ggc_strdup (tempname);
- free (tempname);
-
- clobbervi = new_var_info (NULL, newname, false);
- clobbervi->offset = fi_clobbers;
- clobbervi->size = 1;
- clobbervi->fullsize = vi->fullsize;
- clobbervi->is_full_var = true;
- clobbervi->is_global_var = false;
- clobbervi->is_reg_var = true;
-
- gcc_assert (prev_vi->offset < clobbervi->offset);
- prev_vi->next = clobbervi->id;
- prev_vi = clobbervi;
-
- tempname = xasprintf ("%s.use", name);
- newname = ggc_strdup (tempname);
- free (tempname);
-
- usevi = new_var_info (NULL, newname, false);
- usevi->offset = fi_uses;
- usevi->size = 1;
- usevi->fullsize = vi->fullsize;
- usevi->is_full_var = true;
- usevi->is_global_var = false;
- usevi->is_reg_var = true;
-
- gcc_assert (prev_vi->offset < usevi->offset);
- prev_vi->next = usevi->id;
- prev_vi = usevi;
- }
-
- /* And one for the static chain. */
- if (fn->static_chain_decl != NULL_TREE)
- {
- varinfo_t chainvi;
- const char *newname;
- char *tempname;
-
- tempname = xasprintf ("%s.chain", name);
- newname = ggc_strdup (tempname);
- free (tempname);
-
- chainvi = new_var_info (fn->static_chain_decl, newname, false);
- chainvi->offset = fi_static_chain;
- chainvi->size = 1;
- chainvi->fullsize = vi->fullsize;
- chainvi->is_full_var = true;
- chainvi->is_global_var = false;
-
- insert_vi_for_tree (fn->static_chain_decl, chainvi);
-
- if (nonlocal_p
- && chainvi->may_have_pointers)
- make_constraint_from (chainvi, nonlocal_id);
-
- gcc_assert (prev_vi->offset < chainvi->offset);
- prev_vi->next = chainvi->id;
- prev_vi = chainvi;
- }
-
- /* Create a variable for the return var. */
- if (DECL_RESULT (decl) != NULL
- || !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
- {
- varinfo_t resultvi;
- const char *newname;
- char *tempname;
- tree resultdecl = decl;
-
- if (DECL_RESULT (decl))
- resultdecl = DECL_RESULT (decl);
-
- tempname = xasprintf ("%s.result", name);
- newname = ggc_strdup (tempname);
- free (tempname);
-
- resultvi = new_var_info (resultdecl, newname, false);
- resultvi->offset = fi_result;
- resultvi->size = 1;
- resultvi->fullsize = vi->fullsize;
- resultvi->is_full_var = true;
- if (DECL_RESULT (decl))
- resultvi->may_have_pointers = true;
-
- if (DECL_RESULT (decl))
- insert_vi_for_tree (DECL_RESULT (decl), resultvi);
-
- if (nonlocal_p
- && DECL_RESULT (decl)
- && DECL_BY_REFERENCE (DECL_RESULT (decl)))
- make_constraint_from (resultvi, nonlocal_id);
-
- gcc_assert (prev_vi->offset < resultvi->offset);
- prev_vi->next = resultvi->id;
- prev_vi = resultvi;
- }
-
- /* We also need to make function return values escape. Nothing
- escapes by returning from main though. */
- if (nonlocal_p
- && !MAIN_NAME_P (DECL_NAME (decl)))
- {
- varinfo_t fi, rvi;
- fi = lookup_vi_for_tree (decl);
- rvi = first_vi_for_offset (fi, fi_result);
- if (rvi && rvi->offset == fi_result)
- make_copy_constraint (get_varinfo (escaped_id), rvi->id);
- }
-
- /* Set up variables for each argument. */
- arg = DECL_ARGUMENTS (decl);
- for (i = 0; i < num_args; i++)
- {
- varinfo_t argvi;
- const char *newname;
- char *tempname;
- tree argdecl = decl;
-
- if (arg)
- argdecl = arg;
-
- tempname = xasprintf ("%s.arg%d", name, i);
- newname = ggc_strdup (tempname);
- free (tempname);
-
- argvi = new_var_info (argdecl, newname, false);
- argvi->offset = fi_parm_base + i;
- argvi->size = 1;
- argvi->is_full_var = true;
- argvi->fullsize = vi->fullsize;
- if (arg)
- argvi->may_have_pointers = true;
-
- if (arg)
- insert_vi_for_tree (arg, argvi);
-
- if (nonlocal_p
- && argvi->may_have_pointers)
- make_constraint_from (argvi, nonlocal_id);
-
- gcc_assert (prev_vi->offset < argvi->offset);
- prev_vi->next = argvi->id;
- prev_vi = argvi;
- if (arg)
- arg = DECL_CHAIN (arg);
- }
-
- /* Add one representative for all further args. */
- if (is_varargs)
- {
- varinfo_t argvi;
- const char *newname;
- char *tempname;
- tree decl;
-
- tempname = xasprintf ("%s.varargs", name);
- newname = ggc_strdup (tempname);
- free (tempname);
-
- /* We need sth that can be pointed to for va_start. */
- decl = build_fake_var_decl (ptr_type_node);
-
- argvi = new_var_info (decl, newname, false);
- argvi->offset = fi_parm_base + num_args;
- argvi->size = ~0;
- argvi->is_full_var = true;
- argvi->is_heap_var = true;
- argvi->fullsize = vi->fullsize;
-
- if (nonlocal_p
- && argvi->may_have_pointers)
- make_constraint_from (argvi, nonlocal_id);
-
- gcc_assert (prev_vi->offset < argvi->offset);
- prev_vi->next = argvi->id;
- }
-
- return vi;
-}
-
-
-/* Return true if FIELDSTACK contains fields that overlap.
- FIELDSTACK is assumed to be sorted by offset. */
-
-static bool
-check_for_overlaps (const vec<fieldoff_s> &fieldstack)
-{
- fieldoff_s *fo = NULL;
- unsigned int i;
- HOST_WIDE_INT lastoffset = -1;
-
- FOR_EACH_VEC_ELT (fieldstack, i, fo)
- {
- if (fo->offset == lastoffset)
- return true;
- lastoffset = fo->offset;
- }
- return false;
-}
-
-/* Create a varinfo structure for NAME and DECL, and add it to VARMAP.
- This will also create any varinfo structures necessary for fields
- of DECL. DECL is a function parameter if HANDLE_PARAM is set.
- HANDLED_STRUCT_TYPE is used to register struct types reached by following
- restrict pointers. This is needed to prevent infinite recursion.
- If ADD_RESTRICT, pretend that the pointer NAME is restrict even if DECL
- does not advertise it. */
-
-static varinfo_t
-create_variable_info_for_1 (tree decl, const char *name, bool add_id,
- bool handle_param, bitmap handled_struct_type,
- bool add_restrict = false)
-{
- varinfo_t vi, newvi;
- tree decl_type = TREE_TYPE (decl);
- tree declsize = DECL_P (decl) ? DECL_SIZE (decl) : TYPE_SIZE (decl_type);
- auto_vec<fieldoff_s> fieldstack;
- fieldoff_s *fo;
- unsigned int i;
-
- if (!declsize
- || !tree_fits_uhwi_p (declsize))
- {
- vi = new_var_info (decl, name, add_id);
- vi->offset = 0;
- vi->size = ~0;
- vi->fullsize = ~0;
- vi->is_unknown_size_var = true;
- vi->is_full_var = true;
- vi->may_have_pointers = true;
- return vi;
- }
-
- /* Collect field information. */
- if (use_field_sensitive
- && var_can_have_subvars (decl)
- /* ??? Force us to not use subfields for globals in IPA mode.
- Else we'd have to parse arbitrary initializers. */
- && !(in_ipa_mode
- && is_global_var (decl)))
- {
- fieldoff_s *fo = NULL;
- bool notokay = false;
- unsigned int i;
-
- push_fields_onto_fieldstack (decl_type, &fieldstack, 0);
-
- for (i = 0; !notokay && fieldstack.iterate (i, &fo); i++)
- if (fo->has_unknown_size
- || fo->offset < 0)
- {
- notokay = true;
- break;
- }
-
- /* We can't sort them if we have a field with a variable sized type,
- which will make notokay = true. In that case, we are going to return
- without creating varinfos for the fields anyway, so sorting them is a
- waste to boot. */
- if (!notokay)
- {
- sort_fieldstack (fieldstack);
- /* Due to some C++ FE issues, like PR 22488, we might end up
- what appear to be overlapping fields even though they,
- in reality, do not overlap. Until the C++ FE is fixed,
- we will simply disable field-sensitivity for these cases. */
- notokay = check_for_overlaps (fieldstack);
- }
-
- if (notokay)
- fieldstack.release ();
- }
-
- /* If we didn't end up collecting sub-variables create a full
- variable for the decl. */
- if (fieldstack.length () == 0
- || fieldstack.length () > (unsigned)param_max_fields_for_field_sensitive)
- {
- vi = new_var_info (decl, name, add_id);
- vi->offset = 0;
- vi->may_have_pointers = true;
- vi->fullsize = tree_to_uhwi (declsize);
- vi->size = vi->fullsize;
- vi->is_full_var = true;
- if (POINTER_TYPE_P (decl_type)
- && (TYPE_RESTRICT (decl_type) || add_restrict))
- vi->only_restrict_pointers = 1;
- if (vi->only_restrict_pointers
- && !type_contains_placeholder_p (TREE_TYPE (decl_type))
- && handle_param
- && !bitmap_bit_p (handled_struct_type,
- TYPE_UID (TREE_TYPE (decl_type))))
- {
- varinfo_t rvi;
- tree heapvar = build_fake_var_decl (TREE_TYPE (decl_type));
- DECL_EXTERNAL (heapvar) = 1;
- if (var_can_have_subvars (heapvar))
- bitmap_set_bit (handled_struct_type,
- TYPE_UID (TREE_TYPE (decl_type)));
- rvi = create_variable_info_for_1 (heapvar, "PARM_NOALIAS", true,
- true, handled_struct_type);
- if (var_can_have_subvars (heapvar))
- bitmap_clear_bit (handled_struct_type,
- TYPE_UID (TREE_TYPE (decl_type)));
- rvi->is_restrict_var = 1;
- insert_vi_for_tree (heapvar, rvi);
- make_constraint_from (vi, rvi->id);
- make_param_constraints (rvi);
- }
- fieldstack.release ();
- return vi;
- }
-
- vi = new_var_info (decl, name, add_id);
- vi->fullsize = tree_to_uhwi (declsize);
- if (fieldstack.length () == 1)
- vi->is_full_var = true;
- for (i = 0, newvi = vi;
- fieldstack.iterate (i, &fo);
- ++i, newvi = vi_next (newvi))
- {
- const char *newname = NULL;
- char *tempname;
-
- if (dump_file)
- {
- if (fieldstack.length () != 1)
- {
- tempname
- = xasprintf ("%s." HOST_WIDE_INT_PRINT_DEC
- "+" HOST_WIDE_INT_PRINT_DEC, name,
- fo->offset, fo->size);
- newname = ggc_strdup (tempname);
- free (tempname);
- }
- }
- else
- newname = "NULL";
-
- if (newname)
- newvi->name = newname;
- newvi->offset = fo->offset;
- newvi->size = fo->size;
- newvi->fullsize = vi->fullsize;
- newvi->may_have_pointers = fo->may_have_pointers;
- newvi->only_restrict_pointers = fo->only_restrict_pointers;
- if (handle_param
- && newvi->only_restrict_pointers
- && !type_contains_placeholder_p (fo->restrict_pointed_type)
- && !bitmap_bit_p (handled_struct_type,
- TYPE_UID (fo->restrict_pointed_type)))
- {
- varinfo_t rvi;
- tree heapvar = build_fake_var_decl (fo->restrict_pointed_type);
- DECL_EXTERNAL (heapvar) = 1;
- if (var_can_have_subvars (heapvar))
- bitmap_set_bit (handled_struct_type,
- TYPE_UID (fo->restrict_pointed_type));
- rvi = create_variable_info_for_1 (heapvar, "PARM_NOALIAS", true,
- true, handled_struct_type);
- if (var_can_have_subvars (heapvar))
- bitmap_clear_bit (handled_struct_type,
- TYPE_UID (fo->restrict_pointed_type));
- rvi->is_restrict_var = 1;
- insert_vi_for_tree (heapvar, rvi);
- make_constraint_from (newvi, rvi->id);
- make_param_constraints (rvi);
- }
- if (i + 1 < fieldstack.length ())
- {
- varinfo_t tem = new_var_info (decl, name, false);
- newvi->next = tem->id;
- tem->head = vi->id;
- }
- }
-
- return vi;
-}
-
-static unsigned int
-create_variable_info_for (tree decl, const char *name, bool add_id)
-{
- /* First see if we are dealing with an ifunc resolver call and
- assiociate that with a call to the resolver function result. */
- cgraph_node *node;
- if (in_ipa_mode
- && TREE_CODE (decl) == FUNCTION_DECL
- && (node = cgraph_node::get (decl))
- && node->ifunc_resolver)
- {
- varinfo_t fi = get_vi_for_tree (node->get_alias_target ()->decl);
- constraint_expr rhs
- = get_function_part_constraint (fi, fi_result);
- fi = new_var_info (NULL_TREE, "ifuncres", true);
- fi->is_reg_var = true;
- constraint_expr lhs;
- lhs.type = SCALAR;
- lhs.var = fi->id;
- lhs.offset = 0;
- process_constraint (new_constraint (lhs, rhs));
- insert_vi_for_tree (decl, fi);
- return fi->id;
- }
-
- varinfo_t vi = create_variable_info_for_1 (decl, name, add_id, false, NULL);
- unsigned int id = vi->id;
-
- insert_vi_for_tree (decl, vi);
-
- if (!VAR_P (decl))
- return id;
-
- /* Create initial constraints for globals. */
- for (; vi; vi = vi_next (vi))
- {
- if (!vi->may_have_pointers
- || !vi->is_global_var)
- continue;
-
- /* Mark global restrict qualified pointers. */
- if ((POINTER_TYPE_P (TREE_TYPE (decl))
- && TYPE_RESTRICT (TREE_TYPE (decl)))
- || vi->only_restrict_pointers)
- {
- varinfo_t rvi
- = make_constraint_from_global_restrict (vi, "GLOBAL_RESTRICT",
- true);
- /* ??? For now exclude reads from globals as restrict sources
- if those are not (indirectly) from incoming parameters. */
- rvi->is_restrict_var = false;
- continue;
- }
-
- /* In non-IPA mode the initializer from nonlocal is all we need. */
- if (!in_ipa_mode
- || DECL_HARD_REGISTER (decl))
- make_copy_constraint (vi, nonlocal_id);
-
- /* In IPA mode parse the initializer and generate proper constraints
- for it. */
- else
- {
- varpool_node *vnode = varpool_node::get (decl);
-
- /* For escaped variables initialize them from nonlocal. */
- if (!vnode->all_refs_explicit_p ())
- make_copy_constraint (vi, nonlocal_id);
-
- /* If this is a global variable with an initializer and we are in
- IPA mode generate constraints for it. */
- ipa_ref *ref;
- for (unsigned idx = 0; vnode->iterate_reference (idx, ref); ++idx)
- {
- auto_vec<ce_s> rhsc;
- struct constraint_expr lhs, *rhsp;
- unsigned i;
- get_constraint_for_address_of (ref->referred->decl, &rhsc);
- lhs.var = vi->id;
- lhs.offset = 0;
- lhs.type = SCALAR;
- FOR_EACH_VEC_ELT (rhsc, i, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- /* If this is a variable that escapes from the unit
- the initializer escapes as well. */
- if (!vnode->all_refs_explicit_p ())
- {
- lhs.var = escaped_id;
- lhs.offset = 0;
- lhs.type = SCALAR;
- FOR_EACH_VEC_ELT (rhsc, i, rhsp)
- process_constraint (new_constraint (lhs, *rhsp));
- }
- }
- }
- }
-
- return id;
-}
-
-/* Print out the points-to solution for VAR to FILE. */
-
-static void
-dump_solution_for_var (FILE *file, unsigned int var)
-{
- varinfo_t vi = get_varinfo (var);
- unsigned int i;
- bitmap_iterator bi;
-
- /* Dump the solution for unified vars anyway, this avoids difficulties
- in scanning dumps in the testsuite. */
- fprintf (file, "%s = { ", vi->name);
- vi = get_varinfo (find (var));
- EXECUTE_IF_SET_IN_BITMAP (vi->solution, 0, i, bi)
- fprintf (file, "%s ", get_varinfo (i)->name);
- fprintf (file, "}");
-
- /* But note when the variable was unified. */
- if (vi->id != var)
- fprintf (file, " same as %s", vi->name);
-
- fprintf (file, "\n");
-}
-
-/* Print the points-to solution for VAR to stderr. */
-
-DEBUG_FUNCTION void
-debug_solution_for_var (unsigned int var)
-{
- dump_solution_for_var (stderr, var);
-}
-
-/* Register the constraints for function parameter related VI. */
-
-static void
-make_param_constraints (varinfo_t vi)
-{
- for (; vi; vi = vi_next (vi))
- {
- if (vi->only_restrict_pointers)
- ;
- else if (vi->may_have_pointers)
- make_constraint_from (vi, nonlocal_id);
-
- if (vi->is_full_var)
- break;
- }
-}
-
-/* Create varinfo structures for all of the variables in the
- function for intraprocedural mode. */
-
-static void
-intra_create_variable_infos (struct function *fn)
-{
- tree t;
- bitmap handled_struct_type = NULL;
- bool this_parm_in_ctor = DECL_CXX_CONSTRUCTOR_P (fn->decl);
-
- /* For each incoming pointer argument arg, create the constraint ARG
- = NONLOCAL or a dummy variable if it is a restrict qualified
- passed-by-reference argument. */
- for (t = DECL_ARGUMENTS (fn->decl); t; t = DECL_CHAIN (t))
- {
- if (handled_struct_type == NULL)
- handled_struct_type = BITMAP_ALLOC (NULL);
-
- varinfo_t p
- = create_variable_info_for_1 (t, alias_get_name (t), false, true,
- handled_struct_type, this_parm_in_ctor);
- insert_vi_for_tree (t, p);
-
- make_param_constraints (p);
-
- this_parm_in_ctor = false;
- }
-
- if (handled_struct_type != NULL)
- BITMAP_FREE (handled_struct_type);
-
- /* Add a constraint for a result decl that is passed by reference. */
- if (DECL_RESULT (fn->decl)
- && DECL_BY_REFERENCE (DECL_RESULT (fn->decl)))
- {
- varinfo_t p, result_vi = get_vi_for_tree (DECL_RESULT (fn->decl));
-
- for (p = result_vi; p; p = vi_next (p))
- make_constraint_from (p, nonlocal_id);
- }
-
- /* Add a constraint for the incoming static chain parameter. */
- if (fn->static_chain_decl != NULL_TREE)
- {
- varinfo_t p, chain_vi = get_vi_for_tree (fn->static_chain_decl);
-
- for (p = chain_vi; p; p = vi_next (p))
- make_constraint_from (p, nonlocal_id);
- }
-}
-
-/* Structure used to put solution bitmaps in a hashtable so they can
- be shared among variables with the same points-to set. */
-
-typedef struct shared_bitmap_info
-{
- bitmap pt_vars;
- hashval_t hashcode;
-} *shared_bitmap_info_t;
-typedef const struct shared_bitmap_info *const_shared_bitmap_info_t;
-
-/* Shared_bitmap hashtable helpers. */
-
-struct shared_bitmap_hasher : free_ptr_hash <shared_bitmap_info>
-{
- static inline hashval_t hash (const shared_bitmap_info *);
- static inline bool equal (const shared_bitmap_info *,
- const shared_bitmap_info *);
-};
-
-/* Hash function for a shared_bitmap_info_t */
-
-inline hashval_t
-shared_bitmap_hasher::hash (const shared_bitmap_info *bi)
-{
- return bi->hashcode;
-}
-
-/* Equality function for two shared_bitmap_info_t's. */
-
-inline bool
-shared_bitmap_hasher::equal (const shared_bitmap_info *sbi1,
- const shared_bitmap_info *sbi2)
-{
- return bitmap_equal_p (sbi1->pt_vars, sbi2->pt_vars);
-}
-
-/* Shared_bitmap hashtable. */
-
-static hash_table<shared_bitmap_hasher> *shared_bitmap_table;
-
-/* Lookup a bitmap in the shared bitmap hashtable, and return an already
- existing instance if there is one, NULL otherwise. */
-
-static bitmap
-shared_bitmap_lookup (bitmap pt_vars)
-{
- shared_bitmap_info **slot;
- struct shared_bitmap_info sbi;
-
- sbi.pt_vars = pt_vars;
- sbi.hashcode = bitmap_hash (pt_vars);
-
- slot = shared_bitmap_table->find_slot (&sbi, NO_INSERT);
- if (!slot)
- return NULL;
- else
- return (*slot)->pt_vars;
-}
-
-
-/* Add a bitmap to the shared bitmap hashtable. */
-
-static void
-shared_bitmap_add (bitmap pt_vars)
-{
- shared_bitmap_info **slot;
- shared_bitmap_info_t sbi = XNEW (struct shared_bitmap_info);
-
- sbi->pt_vars = pt_vars;
- sbi->hashcode = bitmap_hash (pt_vars);
-
- slot = shared_bitmap_table->find_slot (sbi, INSERT);
- gcc_assert (!*slot);
- *slot = sbi;
-}
-
-
-/* Set bits in INTO corresponding to the variable uids in solution set FROM. */
-
-static void
-set_uids_in_ptset (bitmap into, bitmap from, struct pt_solution *pt,
- tree fndecl)
-{
- unsigned int i;
- bitmap_iterator bi;
- varinfo_t escaped_vi = get_varinfo (find (escaped_id));
- bool everything_escaped
- = escaped_vi->solution && bitmap_bit_p (escaped_vi->solution, anything_id);
-
- EXECUTE_IF_SET_IN_BITMAP (from, 0, i, bi)
- {
- varinfo_t vi = get_varinfo (i);
-
- if (vi->is_artificial_var)
- continue;
-
- if (everything_escaped
- || (escaped_vi->solution
- && bitmap_bit_p (escaped_vi->solution, i)))
- {
- pt->vars_contains_escaped = true;
- pt->vars_contains_escaped_heap |= vi->is_heap_var;
- }
-
- if (vi->is_restrict_var)
- pt->vars_contains_restrict = true;
-
- if (VAR_P (vi->decl)
- || TREE_CODE (vi->decl) == PARM_DECL
- || TREE_CODE (vi->decl) == RESULT_DECL)
- {
- /* If we are in IPA mode we will not recompute points-to
- sets after inlining so make sure they stay valid. */
- if (in_ipa_mode
- && !DECL_PT_UID_SET_P (vi->decl))
- SET_DECL_PT_UID (vi->decl, DECL_UID (vi->decl));
-
- /* Add the decl to the points-to set. Note that the points-to
- set contains global variables. */
- bitmap_set_bit (into, DECL_PT_UID (vi->decl));
- if (vi->is_global_var
- /* In IPA mode the escaped_heap trick doesn't work as
- ESCAPED is escaped from the unit but
- pt_solution_includes_global needs to answer true for
- all variables not automatic within a function.
- For the same reason is_global_var is not the
- correct flag to track - local variables from other
- functions also need to be considered global.
- Conveniently all HEAP vars are not put in function
- scope. */
- || (in_ipa_mode
- && fndecl
- && ! auto_var_in_fn_p (vi->decl, fndecl)))
- pt->vars_contains_nonlocal = true;
-
- /* If we have a variable that is interposable record that fact
- for pointer comparison simplification. */
- if (VAR_P (vi->decl)
- && (TREE_STATIC (vi->decl) || DECL_EXTERNAL (vi->decl))
- && ! decl_binds_to_current_def_p (vi->decl))
- pt->vars_contains_interposable = true;
-
- /* If this is a local variable we can have overlapping lifetime
- of different function invocations through recursion duplicate
- it with its shadow variable. */
- if (in_ipa_mode
- && vi->shadow_var_uid != 0)
- {
- bitmap_set_bit (into, vi->shadow_var_uid);
- pt->vars_contains_nonlocal = true;
- }
- }
-
- else if (TREE_CODE (vi->decl) == FUNCTION_DECL
- || TREE_CODE (vi->decl) == LABEL_DECL)
- {
- /* Nothing should read/write from/to code so we can
- save bits by not including them in the points-to bitmaps.
- Still mark the points-to set as containing global memory
- to make code-patching possible - see PR70128. */
- pt->vars_contains_nonlocal = true;
- }
- }
-}
-
-
-/* Compute the points-to solution *PT for the variable VI. */
-
-static struct pt_solution
-find_what_var_points_to (tree fndecl, varinfo_t orig_vi)
-{
- unsigned int i;
- bitmap_iterator bi;
- bitmap finished_solution;
- bitmap result;
- varinfo_t vi;
- struct pt_solution *pt;
-
- /* This variable may have been collapsed, let's get the real
- variable. */
- vi = get_varinfo (find (orig_vi->id));
-
- /* See if we have already computed the solution and return it. */
- pt_solution **slot = &final_solutions->get_or_insert (vi);
- if (*slot != NULL)
- return **slot;
-
- *slot = pt = XOBNEW (&final_solutions_obstack, struct pt_solution);
- memset (pt, 0, sizeof (struct pt_solution));
-
- /* Translate artificial variables into SSA_NAME_PTR_INFO
- attributes. */
- EXECUTE_IF_SET_IN_BITMAP (vi->solution, 0, i, bi)
- {
- varinfo_t vi = get_varinfo (i);
-
- if (vi->is_artificial_var)
- {
- if (vi->id == nothing_id)
- pt->null = 1;
- else if (vi->id == escaped_id)
- {
- if (in_ipa_mode)
- pt->ipa_escaped = 1;
- else
- pt->escaped = 1;
- /* Expand some special vars of ESCAPED in-place here. */
- varinfo_t evi = get_varinfo (find (escaped_id));
- if (bitmap_bit_p (evi->solution, nonlocal_id))
- pt->nonlocal = 1;
- }
- else if (vi->id == nonlocal_id)
- pt->nonlocal = 1;
- else if (vi->id == string_id)
- /* Nobody cares - STRING_CSTs are read-only entities. */
- ;
- else if (vi->id == anything_id
- || vi->id == integer_id)
- pt->anything = 1;
- }
- }
-
- /* Instead of doing extra work, simply do not create
- elaborate points-to information for pt_anything pointers. */
- if (pt->anything)
- return *pt;
-
- /* Share the final set of variables when possible. */
- finished_solution = BITMAP_GGC_ALLOC ();
- stats.points_to_sets_created++;
-
- set_uids_in_ptset (finished_solution, vi->solution, pt, fndecl);
- result = shared_bitmap_lookup (finished_solution);
- if (!result)
- {
- shared_bitmap_add (finished_solution);
- pt->vars = finished_solution;
- }
- else
- {
- pt->vars = result;
- bitmap_clear (finished_solution);
- }
-
- return *pt;
-}
-
-/* Given a pointer variable P, fill in its points-to set. */
-
-static void
-find_what_p_points_to (tree fndecl, tree p)
-{
- struct ptr_info_def *pi;
- tree lookup_p = p;
- varinfo_t vi;
- value_range vr;
- get_range_query (DECL_STRUCT_FUNCTION (fndecl))->range_of_expr (vr, p);
- bool nonnull = vr.nonzero_p ();
-
- /* For parameters, get at the points-to set for the actual parm
- decl. */
- if (TREE_CODE (p) == SSA_NAME
- && SSA_NAME_IS_DEFAULT_DEF (p)
- && (TREE_CODE (SSA_NAME_VAR (p)) == PARM_DECL
- || TREE_CODE (SSA_NAME_VAR (p)) == RESULT_DECL))
- lookup_p = SSA_NAME_VAR (p);
-
- vi = lookup_vi_for_tree (lookup_p);
- if (!vi)
- return;
-
- pi = get_ptr_info (p);
- pi->pt = find_what_var_points_to (fndecl, vi);
- /* Conservatively set to NULL from PTA (to true). */
- pi->pt.null = 1;
- /* Preserve pointer nonnull globally computed. */
- if (nonnull)
- set_ptr_nonnull (p);
-}
-
-
-/* Query statistics for points-to solutions. */
-
-static struct {
- unsigned HOST_WIDE_INT pt_solution_includes_may_alias;
- unsigned HOST_WIDE_INT pt_solution_includes_no_alias;
- unsigned HOST_WIDE_INT pt_solutions_intersect_may_alias;
- unsigned HOST_WIDE_INT pt_solutions_intersect_no_alias;
-} pta_stats;
-
-void
-dump_pta_stats (FILE *s)
-{
- fprintf (s, "\nPTA query stats:\n");
- fprintf (s, " pt_solution_includes: "
- HOST_WIDE_INT_PRINT_DEC" disambiguations, "
- HOST_WIDE_INT_PRINT_DEC" queries\n",
- pta_stats.pt_solution_includes_no_alias,
- pta_stats.pt_solution_includes_no_alias
- + pta_stats.pt_solution_includes_may_alias);
- fprintf (s, " pt_solutions_intersect: "
- HOST_WIDE_INT_PRINT_DEC" disambiguations, "
- HOST_WIDE_INT_PRINT_DEC" queries\n",
- pta_stats.pt_solutions_intersect_no_alias,
- pta_stats.pt_solutions_intersect_no_alias
- + pta_stats.pt_solutions_intersect_may_alias);
-}
-
-
-/* Reset the points-to solution *PT to a conservative default
- (point to anything). */
-
-void
-pt_solution_reset (struct pt_solution *pt)
-{
- memset (pt, 0, sizeof (struct pt_solution));
- pt->anything = true;
- pt->null = true;
-}
-
-/* Set the points-to solution *PT to point only to the variables
- in VARS. VARS_CONTAINS_GLOBAL specifies whether that contains
- global variables and VARS_CONTAINS_RESTRICT specifies whether
- it contains restrict tag variables. */
-
-void
-pt_solution_set (struct pt_solution *pt, bitmap vars,
- bool vars_contains_nonlocal)
-{
- memset (pt, 0, sizeof (struct pt_solution));
- pt->vars = vars;
- pt->vars_contains_nonlocal = vars_contains_nonlocal;
- pt->vars_contains_escaped
- = (cfun->gimple_df->escaped.anything
- || bitmap_intersect_p (cfun->gimple_df->escaped.vars, vars));
-}
-
-/* Set the points-to solution *PT to point only to the variable VAR. */
-
-void
-pt_solution_set_var (struct pt_solution *pt, tree var)
-{
- memset (pt, 0, sizeof (struct pt_solution));
- pt->vars = BITMAP_GGC_ALLOC ();
- bitmap_set_bit (pt->vars, DECL_PT_UID (var));
- pt->vars_contains_nonlocal = is_global_var (var);
- pt->vars_contains_escaped
- = (cfun->gimple_df->escaped.anything
- || bitmap_bit_p (cfun->gimple_df->escaped.vars, DECL_PT_UID (var)));
-}
-
-/* Computes the union of the points-to solutions *DEST and *SRC and
- stores the result in *DEST. This changes the points-to bitmap
- of *DEST and thus may not be used if that might be shared.
- The points-to bitmap of *SRC and *DEST will not be shared after
- this function if they were not before. */
-
-static void
-pt_solution_ior_into (struct pt_solution *dest, struct pt_solution *src)
-{
- dest->anything |= src->anything;
- if (dest->anything)
- {
- pt_solution_reset (dest);
- return;
- }
-
- dest->nonlocal |= src->nonlocal;
- dest->escaped |= src->escaped;
- dest->ipa_escaped |= src->ipa_escaped;
- dest->null |= src->null;
- dest->vars_contains_nonlocal |= src->vars_contains_nonlocal;
- dest->vars_contains_escaped |= src->vars_contains_escaped;
- dest->vars_contains_escaped_heap |= src->vars_contains_escaped_heap;
- if (!src->vars)
- return;
-
- if (!dest->vars)
- dest->vars = BITMAP_GGC_ALLOC ();
- bitmap_ior_into (dest->vars, src->vars);
-}
-
-/* Return true if the points-to solution *PT is empty. */
-
-bool
-pt_solution_empty_p (const pt_solution *pt)
-{
- if (pt->anything
- || pt->nonlocal)
- return false;
-
- if (pt->vars
- && !bitmap_empty_p (pt->vars))
- return false;
-
- /* If the solution includes ESCAPED, check if that is empty. */
- if (pt->escaped
- && !pt_solution_empty_p (&cfun->gimple_df->escaped))
- return false;
-
- /* If the solution includes ESCAPED, check if that is empty. */
- if (pt->ipa_escaped
- && !pt_solution_empty_p (&ipa_escaped_pt))
- return false;
-
- return true;
-}
-
-/* Return true if the points-to solution *PT only point to a single var, and
- return the var uid in *UID. */
-
-bool
-pt_solution_singleton_or_null_p (struct pt_solution *pt, unsigned *uid)
-{
- if (pt->anything || pt->nonlocal || pt->escaped || pt->ipa_escaped
- || pt->vars == NULL
- || !bitmap_single_bit_set_p (pt->vars))
- return false;
-
- *uid = bitmap_first_set_bit (pt->vars);
- return true;
-}
-
-/* Return true if the points-to solution *PT includes global memory. */
-
-bool
-pt_solution_includes_global (struct pt_solution *pt)
-{
- if (pt->anything
- || pt->nonlocal
- || pt->vars_contains_nonlocal
- /* The following is a hack to make the malloc escape hack work.
- In reality we'd need different sets for escaped-through-return
- and escaped-to-callees and passes would need to be updated. */
- || pt->vars_contains_escaped_heap)
- return true;
-
- /* 'escaped' is also a placeholder so we have to look into it. */
- if (pt->escaped)
- return pt_solution_includes_global (&cfun->gimple_df->escaped);
-
- if (pt->ipa_escaped)
- return pt_solution_includes_global (&ipa_escaped_pt);
-
- return false;
-}
-
-/* Return true if the points-to solution *PT includes the variable
- declaration DECL. */
-
-static bool
-pt_solution_includes_1 (struct pt_solution *pt, const_tree decl)
-{
- if (pt->anything)
- return true;
-
- if (pt->nonlocal
- && is_global_var (decl))
- return true;
-
- if (pt->vars
- && bitmap_bit_p (pt->vars, DECL_PT_UID (decl)))
- return true;
-
- /* If the solution includes ESCAPED, check it. */
- if (pt->escaped
- && pt_solution_includes_1 (&cfun->gimple_df->escaped, decl))
- return true;
-
- /* If the solution includes ESCAPED, check it. */
- if (pt->ipa_escaped
- && pt_solution_includes_1 (&ipa_escaped_pt, decl))
- return true;
-
- return false;
-}
-
-bool
-pt_solution_includes (struct pt_solution *pt, const_tree decl)
-{
- bool res = pt_solution_includes_1 (pt, decl);
- if (res)
- ++pta_stats.pt_solution_includes_may_alias;
- else
- ++pta_stats.pt_solution_includes_no_alias;
- return res;
-}
-
-/* Return true if both points-to solutions PT1 and PT2 have a non-empty
- intersection. */
-
-static bool
-pt_solutions_intersect_1 (struct pt_solution *pt1, struct pt_solution *pt2)
-{
- if (pt1->anything || pt2->anything)
- return true;
-
- /* If either points to unknown global memory and the other points to
- any global memory they alias. */
- if ((pt1->nonlocal
- && (pt2->nonlocal
- || pt2->vars_contains_nonlocal))
- || (pt2->nonlocal
- && pt1->vars_contains_nonlocal))
- return true;
-
- /* If either points to all escaped memory and the other points to
- any escaped memory they alias. */
- if ((pt1->escaped
- && (pt2->escaped
- || pt2->vars_contains_escaped))
- || (pt2->escaped
- && pt1->vars_contains_escaped))
- return true;
-
- /* Check the escaped solution if required.
- ??? Do we need to check the local against the IPA escaped sets? */
- if ((pt1->ipa_escaped || pt2->ipa_escaped)
- && !pt_solution_empty_p (&ipa_escaped_pt))
- {
- /* If both point to escaped memory and that solution
- is not empty they alias. */
- if (pt1->ipa_escaped && pt2->ipa_escaped)
- return true;
-
- /* If either points to escaped memory see if the escaped solution
- intersects with the other. */
- if ((pt1->ipa_escaped
- && pt_solutions_intersect_1 (&ipa_escaped_pt, pt2))
- || (pt2->ipa_escaped
- && pt_solutions_intersect_1 (&ipa_escaped_pt, pt1)))
- return true;
- }
-
- /* Now both pointers alias if their points-to solution intersects. */
- return (pt1->vars
- && pt2->vars
- && bitmap_intersect_p (pt1->vars, pt2->vars));
-}
-
-bool
-pt_solutions_intersect (struct pt_solution *pt1, struct pt_solution *pt2)
-{
- bool res = pt_solutions_intersect_1 (pt1, pt2);
- if (res)
- ++pta_stats.pt_solutions_intersect_may_alias;
- else
- ++pta_stats.pt_solutions_intersect_no_alias;
- return res;
-}
-
-
-/* Dump points-to information to OUTFILE. */
-
-static void
-dump_sa_points_to_info (FILE *outfile)
-{
- unsigned int i;
-
- fprintf (outfile, "\nPoints-to sets\n\n");
-
- if (dump_flags & TDF_STATS)
- {
- fprintf (outfile, "Stats:\n");
- fprintf (outfile, "Total vars: %d\n", stats.total_vars);
- fprintf (outfile, "Non-pointer vars: %d\n",
- stats.nonpointer_vars);
- fprintf (outfile, "Statically unified vars: %d\n",
- stats.unified_vars_static);
- fprintf (outfile, "Dynamically unified vars: %d\n",
- stats.unified_vars_dynamic);
- fprintf (outfile, "Iterations: %d\n", stats.iterations);
- fprintf (outfile, "Number of edges: %d\n", stats.num_edges);
- fprintf (outfile, "Number of implicit edges: %d\n",
- stats.num_implicit_edges);
- }
-
- for (i = 1; i < varmap.length (); i++)
- {
- varinfo_t vi = get_varinfo (i);
- if (!vi->may_have_pointers)
- continue;
- dump_solution_for_var (outfile, i);
- }
-}
-
-
-/* Debug points-to information to stderr. */
-
-DEBUG_FUNCTION void
-debug_sa_points_to_info (void)
-{
- dump_sa_points_to_info (stderr);
-}
-
-
-/* Initialize the always-existing constraint variables for NULL
- ANYTHING, READONLY, and INTEGER */
-
-static void
-init_base_vars (void)
-{
- struct constraint_expr lhs, rhs;
- varinfo_t var_anything;
- varinfo_t var_nothing;
- varinfo_t var_string;
- varinfo_t var_escaped;
- varinfo_t var_nonlocal;
- varinfo_t var_storedanything;
- varinfo_t var_integer;
-
- /* Variable ID zero is reserved and should be NULL. */
- varmap.safe_push (NULL);
-
- /* Create the NULL variable, used to represent that a variable points
- to NULL. */
- var_nothing = new_var_info (NULL_TREE, "NULL", false);
- gcc_assert (var_nothing->id == nothing_id);
- var_nothing->is_artificial_var = 1;
- var_nothing->offset = 0;
- var_nothing->size = ~0;
- var_nothing->fullsize = ~0;
- var_nothing->is_special_var = 1;
- var_nothing->may_have_pointers = 0;
- var_nothing->is_global_var = 0;
-
- /* Create the ANYTHING variable, used to represent that a variable
- points to some unknown piece of memory. */
- var_anything = new_var_info (NULL_TREE, "ANYTHING", false);
- gcc_assert (var_anything->id == anything_id);
- var_anything->is_artificial_var = 1;
- var_anything->size = ~0;
- var_anything->offset = 0;
- var_anything->fullsize = ~0;
- var_anything->is_special_var = 1;
-
- /* Anything points to anything. This makes deref constraints just
- work in the presence of linked list and other p = *p type loops,
- by saying that *ANYTHING = ANYTHING. */
- lhs.type = SCALAR;
- lhs.var = anything_id;
- lhs.offset = 0;
- rhs.type = ADDRESSOF;
- rhs.var = anything_id;
- rhs.offset = 0;
-
- /* This specifically does not use process_constraint because
- process_constraint ignores all anything = anything constraints, since all
- but this one are redundant. */
- constraints.safe_push (new_constraint (lhs, rhs));
-
- /* Create the STRING variable, used to represent that a variable
- points to a string literal. String literals don't contain
- pointers so STRING doesn't point to anything. */
- var_string = new_var_info (NULL_TREE, "STRING", false);
- gcc_assert (var_string->id == string_id);
- var_string->is_artificial_var = 1;
- var_string->offset = 0;
- var_string->size = ~0;
- var_string->fullsize = ~0;
- var_string->is_special_var = 1;
- var_string->may_have_pointers = 0;
-
- /* Create the ESCAPED variable, used to represent the set of escaped
- memory. */
- var_escaped = new_var_info (NULL_TREE, "ESCAPED", false);
- gcc_assert (var_escaped->id == escaped_id);
- var_escaped->is_artificial_var = 1;
- var_escaped->offset = 0;
- var_escaped->size = ~0;
- var_escaped->fullsize = ~0;
- var_escaped->is_special_var = 0;
-
- /* Create the NONLOCAL variable, used to represent the set of nonlocal
- memory. */
- var_nonlocal = new_var_info (NULL_TREE, "NONLOCAL", false);
- gcc_assert (var_nonlocal->id == nonlocal_id);
- var_nonlocal->is_artificial_var = 1;
- var_nonlocal->offset = 0;
- var_nonlocal->size = ~0;
- var_nonlocal->fullsize = ~0;
- var_nonlocal->is_special_var = 1;
-
- /* ESCAPED = *ESCAPED, because escaped is may-deref'd at calls, etc. */
- lhs.type = SCALAR;
- lhs.var = escaped_id;
- lhs.offset = 0;
- rhs.type = DEREF;
- rhs.var = escaped_id;
- rhs.offset = 0;
- process_constraint (new_constraint (lhs, rhs));
-
- /* ESCAPED = ESCAPED + UNKNOWN_OFFSET, because if a sub-field escapes the
- whole variable escapes. */
- lhs.type = SCALAR;
- lhs.var = escaped_id;
- lhs.offset = 0;
- rhs.type = SCALAR;
- rhs.var = escaped_id;
- rhs.offset = UNKNOWN_OFFSET;
- process_constraint (new_constraint (lhs, rhs));
-
- /* *ESCAPED = NONLOCAL. This is true because we have to assume
- everything pointed to by escaped points to what global memory can
- point to. */
- lhs.type = DEREF;
- lhs.var = escaped_id;
- lhs.offset = 0;
- rhs.type = SCALAR;
- rhs.var = nonlocal_id;
- rhs.offset = 0;
- process_constraint (new_constraint (lhs, rhs));
-
- /* NONLOCAL = &NONLOCAL, NONLOCAL = &ESCAPED. This is true because
- global memory may point to global memory and escaped memory. */
- lhs.type = SCALAR;
- lhs.var = nonlocal_id;
- lhs.offset = 0;
- rhs.type = ADDRESSOF;
- rhs.var = nonlocal_id;
- rhs.offset = 0;
- process_constraint (new_constraint (lhs, rhs));
- rhs.type = ADDRESSOF;
- rhs.var = escaped_id;
- rhs.offset = 0;
- process_constraint (new_constraint (lhs, rhs));
-
- /* Create the STOREDANYTHING variable, used to represent the set of
- variables stored to *ANYTHING. */
- var_storedanything = new_var_info (NULL_TREE, "STOREDANYTHING", false);
- gcc_assert (var_storedanything->id == storedanything_id);
- var_storedanything->is_artificial_var = 1;
- var_storedanything->offset = 0;
- var_storedanything->size = ~0;
- var_storedanything->fullsize = ~0;
- var_storedanything->is_special_var = 0;
-
- /* Create the INTEGER variable, used to represent that a variable points
- to what an INTEGER "points to". */
- var_integer = new_var_info (NULL_TREE, "INTEGER", false);
- gcc_assert (var_integer->id == integer_id);
- var_integer->is_artificial_var = 1;
- var_integer->size = ~0;
- var_integer->fullsize = ~0;
- var_integer->offset = 0;
- var_integer->is_special_var = 1;
-
- /* INTEGER = ANYTHING, because we don't know where a dereference of
- a random integer will point to. */
- lhs.type = SCALAR;
- lhs.var = integer_id;
- lhs.offset = 0;
- rhs.type = ADDRESSOF;
- rhs.var = anything_id;
- rhs.offset = 0;
- process_constraint (new_constraint (lhs, rhs));
-}
-
-/* Initialize things necessary to perform PTA */
-
-static void
-init_alias_vars (void)
-{
- use_field_sensitive = (param_max_fields_for_field_sensitive > 1);
-
- bitmap_obstack_initialize (&pta_obstack);
- bitmap_obstack_initialize (&oldpta_obstack);
- bitmap_obstack_initialize (&predbitmap_obstack);
-
- constraints.create (8);
- varmap.create (8);
- vi_for_tree = new hash_map<tree, varinfo_t>;
- call_stmt_vars = new hash_map<gimple *, varinfo_t>;
-
- memset (&stats, 0, sizeof (stats));
- shared_bitmap_table = new hash_table<shared_bitmap_hasher> (511);
- init_base_vars ();
-
- gcc_obstack_init (&fake_var_decl_obstack);
-
- final_solutions = new hash_map<varinfo_t, pt_solution *>;
- gcc_obstack_init (&final_solutions_obstack);
-}
-
-/* Remove the REF and ADDRESS edges from GRAPH, as well as all the
- predecessor edges. */
-
-static void
-remove_preds_and_fake_succs (constraint_graph_t graph)
-{
- unsigned int i;
-
- /* Clear the implicit ref and address nodes from the successor
- lists. */
- for (i = 1; i < FIRST_REF_NODE; i++)
- {
- if (graph->succs[i])
- bitmap_clear_range (graph->succs[i], FIRST_REF_NODE,
- FIRST_REF_NODE * 2);
- }
-
- /* Free the successor list for the non-ref nodes. */
- for (i = FIRST_REF_NODE + 1; i < graph->size; i++)
- {
- if (graph->succs[i])
- BITMAP_FREE (graph->succs[i]);
- }
-
- /* Now reallocate the size of the successor list as, and blow away
- the predecessor bitmaps. */
- graph->size = varmap.length ();
- graph->succs = XRESIZEVEC (bitmap, graph->succs, graph->size);
-
- free (graph->implicit_preds);
- graph->implicit_preds = NULL;
- free (graph->preds);
- graph->preds = NULL;
- bitmap_obstack_release (&predbitmap_obstack);
-}
-
-/* Solve the constraint set. */
-
-static void
-solve_constraints (void)
-{
- class scc_info *si;
-
- /* Sort varinfos so that ones that cannot be pointed to are last.
- This makes bitmaps more efficient. */
- unsigned int *map = XNEWVEC (unsigned int, varmap.length ());
- for (unsigned i = 0; i < integer_id + 1; ++i)
- map[i] = i;
- /* Start with address-taken vars, followed by not address-taken vars
- to move vars never appearing in the points-to solution bitmaps last. */
- unsigned j = integer_id + 1;
- for (unsigned i = integer_id + 1; i < varmap.length (); ++i)
- if (varmap[varmap[i]->head]->address_taken)
- map[i] = j++;
- for (unsigned i = integer_id + 1; i < varmap.length (); ++i)
- if (! varmap[varmap[i]->head]->address_taken)
- map[i] = j++;
- /* Shuffle varmap according to map. */
- for (unsigned i = integer_id + 1; i < varmap.length (); ++i)
- {
- while (map[varmap[i]->id] != i)
- std::swap (varmap[i], varmap[map[varmap[i]->id]]);
- gcc_assert (bitmap_empty_p (varmap[i]->solution));
- varmap[i]->id = i;
- varmap[i]->next = map[varmap[i]->next];
- varmap[i]->head = map[varmap[i]->head];
- }
- /* Finally rewrite constraints. */
- for (unsigned i = 0; i < constraints.length (); ++i)
- {
- constraints[i]->lhs.var = map[constraints[i]->lhs.var];
- constraints[i]->rhs.var = map[constraints[i]->rhs.var];
- }
- free (map);
-
- if (dump_file)
- fprintf (dump_file,
- "\nCollapsing static cycles and doing variable "
- "substitution\n");
-
- init_graph (varmap.length () * 2);
-
- if (dump_file)
- fprintf (dump_file, "Building predecessor graph\n");
- build_pred_graph ();
-
- if (dump_file)
- fprintf (dump_file, "Detecting pointer and location "
- "equivalences\n");
- si = perform_var_substitution (graph);
-
- if (dump_file)
- fprintf (dump_file, "Rewriting constraints and unifying "
- "variables\n");
- rewrite_constraints (graph, si);
-
- build_succ_graph ();
-
- free_var_substitution_info (si);
-
- /* Attach complex constraints to graph nodes. */
- move_complex_constraints (graph);
-
- if (dump_file)
- fprintf (dump_file, "Uniting pointer but not location equivalent "
- "variables\n");
- unite_pointer_equivalences (graph);
-
- if (dump_file)
- fprintf (dump_file, "Finding indirect cycles\n");
- find_indirect_cycles (graph);
-
- /* Implicit nodes and predecessors are no longer necessary at this
- point. */
- remove_preds_and_fake_succs (graph);
-
- if (dump_file && (dump_flags & TDF_GRAPH))
- {
- fprintf (dump_file, "\n\n// The constraint graph before solve-graph "
- "in dot format:\n");
- dump_constraint_graph (dump_file);
- fprintf (dump_file, "\n\n");
- }
-
- if (dump_file)
- fprintf (dump_file, "Solving graph\n");
-
- solve_graph (graph);
-
- if (dump_file && (dump_flags & TDF_GRAPH))
- {
- fprintf (dump_file, "\n\n// The constraint graph after solve-graph "
- "in dot format:\n");
- dump_constraint_graph (dump_file);
- fprintf (dump_file, "\n\n");
- }
-}
-
-/* Create points-to sets for the current function. See the comments
- at the start of the file for an algorithmic overview. */
-
-static void
-compute_points_to_sets (void)
-{
- basic_block bb;
- varinfo_t vi;
-
- timevar_push (TV_TREE_PTA);
-
- init_alias_vars ();
-
- intra_create_variable_infos (cfun);
-
- /* Now walk all statements and build the constraint set. */
- FOR_EACH_BB_FN (bb, cfun)
- {
- for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi);
- gsi_next (&gsi))
- {
- gphi *phi = gsi.phi ();
-
- if (! virtual_operand_p (gimple_phi_result (phi)))
- find_func_aliases (cfun, phi);
- }
-
- for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);
- gsi_next (&gsi))
- {
- gimple *stmt = gsi_stmt (gsi);
-
- find_func_aliases (cfun, stmt);
- }
- }
-
- if (dump_file)
- {
- fprintf (dump_file, "Points-to analysis\n\nConstraints:\n\n");
- dump_constraints (dump_file, 0);
- }
-
- /* From the constraints compute the points-to sets. */
- solve_constraints ();
-
- /* Post-process solutions for escapes through returns. */
- edge_iterator ei;
- edge e;
- FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR_FOR_FN (cfun)->preds)
- if (greturn *ret = safe_dyn_cast <greturn *> (last_stmt (e->src)))
- {
- tree val = gimple_return_retval (ret);
- /* ??? Easy to handle simple indirections with some work.
- Arbitrary references like foo.bar.baz are more difficult
- (but conservatively easy enough with just looking at the base).
- Mind to fixup find_func_aliases as well. */
- if (!val || !SSA_VAR_P (val))
- continue;
- /* returns happen last in non-IPA so they only influence
- the ESCAPED solution and we can filter local variables. */
- varinfo_t escaped_vi = get_varinfo (find (escaped_id));
- varinfo_t vi = lookup_vi_for_tree (val);
- bitmap delta = BITMAP_ALLOC (&pta_obstack);
- bitmap_iterator bi;
- unsigned i;
- for (; vi; vi = vi_next (vi))
- {
- varinfo_t part_vi = get_varinfo (find (vi->id));
- EXECUTE_IF_AND_COMPL_IN_BITMAP (part_vi->solution,
- escaped_vi->solution, 0, i, bi)
- {
- varinfo_t pointed_to_vi = get_varinfo (i);
- if (pointed_to_vi->is_global_var
- /* We delay marking of heap memory as global. */
- || pointed_to_vi->is_heap_var)
- bitmap_set_bit (delta, i);
- }
- }
-
- /* Now compute the transitive closure. */
- bitmap_ior_into (escaped_vi->solution, delta);
- bitmap new_delta = BITMAP_ALLOC (&pta_obstack);
- while (!bitmap_empty_p (delta))
- {
- EXECUTE_IF_SET_IN_BITMAP (delta, 0, i, bi)
- {
- varinfo_t pointed_to_vi = get_varinfo (i);
- pointed_to_vi = get_varinfo (find (pointed_to_vi->id));
- unsigned j;
- bitmap_iterator bi2;
- EXECUTE_IF_AND_COMPL_IN_BITMAP (pointed_to_vi->solution,
- escaped_vi->solution,
- 0, j, bi2)
- {
- varinfo_t pointed_to_vi2 = get_varinfo (j);
- if (pointed_to_vi2->is_global_var
- /* We delay marking of heap memory as global. */
- || pointed_to_vi2->is_heap_var)
- bitmap_set_bit (new_delta, j);
- }
- }
- bitmap_ior_into (escaped_vi->solution, new_delta);
- bitmap_clear (delta);
- std::swap (delta, new_delta);
- }
- BITMAP_FREE (delta);
- BITMAP_FREE (new_delta);
- }
-
- if (dump_file)
- dump_sa_points_to_info (dump_file);
-
- /* Compute the points-to set for ESCAPED used for call-clobber analysis. */
- cfun->gimple_df->escaped = find_what_var_points_to (cfun->decl,
- get_varinfo (escaped_id));
-
- /* Make sure the ESCAPED solution (which is used as placeholder in
- other solutions) does not reference itself. This simplifies
- points-to solution queries. */
- cfun->gimple_df->escaped.escaped = 0;
-
- /* Compute the points-to sets for pointer SSA_NAMEs. */
- unsigned i;
- tree ptr;
-
- FOR_EACH_SSA_NAME (i, ptr, cfun)
- {
- if (POINTER_TYPE_P (TREE_TYPE (ptr)))
- find_what_p_points_to (cfun->decl, ptr);
- }
-
- /* Compute the call-used/clobbered sets. */
- FOR_EACH_BB_FN (bb, cfun)
- {
- gimple_stmt_iterator gsi;
-
- for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
- {
- gcall *stmt;
- struct pt_solution *pt;
-
- stmt = dyn_cast <gcall *> (gsi_stmt (gsi));
- if (!stmt)
- continue;
-
- pt = gimple_call_use_set (stmt);
- if (gimple_call_flags (stmt) & ECF_CONST)
- memset (pt, 0, sizeof (struct pt_solution));
- else
- {
- bool uses_global_memory = true;
- bool reads_global_memory = true;
-
- determine_global_memory_access (stmt, NULL,
- &reads_global_memory,
- &uses_global_memory);
- if ((vi = lookup_call_use_vi (stmt)) != NULL)
- {
- *pt = find_what_var_points_to (cfun->decl, vi);
- /* Escaped (and thus nonlocal) variables are always
- implicitly used by calls. */
- /* ??? ESCAPED can be empty even though NONLOCAL
- always escaped. */
- if (uses_global_memory)
- {
- pt->nonlocal = 1;
- pt->escaped = 1;
- }
- }
- else if (uses_global_memory)
- {
- /* If there is nothing special about this call then
- we have made everything that is used also escape. */
- *pt = cfun->gimple_df->escaped;
- pt->nonlocal = 1;
- }
- else
- memset (pt, 0, sizeof (struct pt_solution));
- }
-
- pt = gimple_call_clobber_set (stmt);
- if (gimple_call_flags (stmt) & (ECF_CONST|ECF_PURE|ECF_NOVOPS))
- memset (pt, 0, sizeof (struct pt_solution));
- else
- {
- bool writes_global_memory = true;
-
- determine_global_memory_access (stmt, &writes_global_memory,
- NULL, NULL);
-
- if ((vi = lookup_call_clobber_vi (stmt)) != NULL)
- {
- *pt = find_what_var_points_to (cfun->decl, vi);
- /* Escaped (and thus nonlocal) variables are always
- implicitly clobbered by calls. */
- /* ??? ESCAPED can be empty even though NONLOCAL
- always escaped. */
- if (writes_global_memory)
- {
- pt->nonlocal = 1;
- pt->escaped = 1;
- }
- }
- else if (writes_global_memory)
- {
- /* If there is nothing special about this call then
- we have made everything that is used also escape. */
- *pt = cfun->gimple_df->escaped;
- pt->nonlocal = 1;
- }
- else
- memset (pt, 0, sizeof (struct pt_solution));
- }
- }
- }
-
- timevar_pop (TV_TREE_PTA);
-}
-
-
-/* Delete created points-to sets. */
-
-static void
-delete_points_to_sets (void)
-{
- unsigned int i;
-
- delete shared_bitmap_table;
- shared_bitmap_table = NULL;
- if (dump_file && (dump_flags & TDF_STATS))
- fprintf (dump_file, "Points to sets created:%d\n",
- stats.points_to_sets_created);
-
- delete vi_for_tree;
- delete call_stmt_vars;
- bitmap_obstack_release (&pta_obstack);
- constraints.release ();
-
- for (i = 0; i < graph->size; i++)
- graph->complex[i].release ();
- free (graph->complex);
-
- free (graph->rep);
- free (graph->succs);
- free (graph->pe);
- free (graph->pe_rep);
- free (graph->indirect_cycles);
- free (graph);
-
- varmap.release ();
- variable_info_pool.release ();
- constraint_pool.release ();
-
- obstack_free (&fake_var_decl_obstack, NULL);
-
- delete final_solutions;
- obstack_free (&final_solutions_obstack, NULL);
-}
-
-struct vls_data
-{
- unsigned short clique;
- bool escaped_p;
- bitmap rvars;
-};
-
-/* Mark "other" loads and stores as belonging to CLIQUE and with
- base zero. */
-
-static bool
-visit_loadstore (gimple *, tree base, tree ref, void *data)
-{
- unsigned short clique = ((vls_data *) data)->clique;
- bitmap rvars = ((vls_data *) data)->rvars;
- bool escaped_p = ((vls_data *) data)->escaped_p;
- if (TREE_CODE (base) == MEM_REF
- || TREE_CODE (base) == TARGET_MEM_REF)
- {
- tree ptr = TREE_OPERAND (base, 0);
- if (TREE_CODE (ptr) == SSA_NAME)
- {
- /* For parameters, get at the points-to set for the actual parm
- decl. */
- if (SSA_NAME_IS_DEFAULT_DEF (ptr)
- && (TREE_CODE (SSA_NAME_VAR (ptr)) == PARM_DECL
- || TREE_CODE (SSA_NAME_VAR (ptr)) == RESULT_DECL))
- ptr = SSA_NAME_VAR (ptr);
-
- /* We need to make sure 'ptr' doesn't include any of
- the restrict tags we added bases for in its points-to set. */
- varinfo_t vi = lookup_vi_for_tree (ptr);
- if (! vi)
- return false;
-
- vi = get_varinfo (find (vi->id));
- if (bitmap_intersect_p (rvars, vi->solution)
- || (escaped_p && bitmap_bit_p (vi->solution, escaped_id)))
- return false;
- }
-
- /* Do not overwrite existing cliques (that includes clique, base
- pairs we just set). */
- if (MR_DEPENDENCE_CLIQUE (base) == 0)
- {
- MR_DEPENDENCE_CLIQUE (base) = clique;
- MR_DEPENDENCE_BASE (base) = 0;
- }
- }
-
- /* For plain decl accesses see whether they are accesses to globals
- and rewrite them to MEM_REFs with { clique, 0 }. */
- if (VAR_P (base)
- && is_global_var (base)
- /* ??? We can't rewrite a plain decl with the walk_stmt_load_store
- ops callback. */
- && base != ref)
- {
- tree *basep = &ref;
- while (handled_component_p (*basep))
- basep = &TREE_OPERAND (*basep, 0);
- gcc_assert (VAR_P (*basep));
- tree ptr = build_fold_addr_expr (*basep);
- tree zero = build_int_cst (TREE_TYPE (ptr), 0);
- *basep = build2 (MEM_REF, TREE_TYPE (*basep), ptr, zero);
- MR_DEPENDENCE_CLIQUE (*basep) = clique;
- MR_DEPENDENCE_BASE (*basep) = 0;
- }
-
- return false;
-}
-
-struct msdi_data {
- tree ptr;
- unsigned short *clique;
- unsigned short *last_ruid;
- varinfo_t restrict_var;
-};
-
-/* If BASE is a MEM_REF then assign a clique, base pair to it, updating
- CLIQUE, *RESTRICT_VAR and LAST_RUID as passed via DATA.
- Return whether dependence info was assigned to BASE. */
-
-static bool
-maybe_set_dependence_info (gimple *, tree base, tree, void *data)
-{
- tree ptr = ((msdi_data *)data)->ptr;
- unsigned short &clique = *((msdi_data *)data)->clique;
- unsigned short &last_ruid = *((msdi_data *)data)->last_ruid;
- varinfo_t restrict_var = ((msdi_data *)data)->restrict_var;
- if ((TREE_CODE (base) == MEM_REF
- || TREE_CODE (base) == TARGET_MEM_REF)
- && TREE_OPERAND (base, 0) == ptr)
- {
- /* Do not overwrite existing cliques. This avoids overwriting dependence
- info inlined from a function with restrict parameters inlined
- into a function with restrict parameters. This usually means we
- prefer to be precise in innermost loops. */
- if (MR_DEPENDENCE_CLIQUE (base) == 0)
- {
- if (clique == 0)
- {
- if (cfun->last_clique == 0)
- cfun->last_clique = 1;
- clique = 1;
- }
- if (restrict_var->ruid == 0)
- restrict_var->ruid = ++last_ruid;
- MR_DEPENDENCE_CLIQUE (base) = clique;
- MR_DEPENDENCE_BASE (base) = restrict_var->ruid;
- return true;
- }
- }
- return false;
-}
-
-/* Clear dependence info for the clique DATA. */
-
-static bool
-clear_dependence_clique (gimple *, tree base, tree, void *data)
-{
- unsigned short clique = (uintptr_t)data;
- if ((TREE_CODE (base) == MEM_REF
- || TREE_CODE (base) == TARGET_MEM_REF)
- && MR_DEPENDENCE_CLIQUE (base) == clique)
- {
- MR_DEPENDENCE_CLIQUE (base) = 0;
- MR_DEPENDENCE_BASE (base) = 0;
- }
-
- return false;
-}
-
-/* Compute the set of independend memory references based on restrict
- tags and their conservative propagation to the points-to sets. */
-
-static void
-compute_dependence_clique (void)
-{
- /* First clear the special "local" clique. */
- basic_block bb;
- if (cfun->last_clique != 0)
- FOR_EACH_BB_FN (bb, cfun)
- for (gimple_stmt_iterator gsi = gsi_start_bb (bb);
- !gsi_end_p (gsi); gsi_next (&gsi))
- {
- gimple *stmt = gsi_stmt (gsi);
- walk_stmt_load_store_ops (stmt, (void *)(uintptr_t) 1,
- clear_dependence_clique,
- clear_dependence_clique);
- }
-
- unsigned short clique = 0;
- unsigned short last_ruid = 0;
- bitmap rvars = BITMAP_ALLOC (NULL);
- bool escaped_p = false;
- for (unsigned i = 0; i < num_ssa_names; ++i)
- {
- tree ptr = ssa_name (i);
- if (!ptr || !POINTER_TYPE_P (TREE_TYPE (ptr)))
- continue;
-
- /* Avoid all this when ptr is not dereferenced? */
- tree p = ptr;
- if (SSA_NAME_IS_DEFAULT_DEF (ptr)
- && (TREE_CODE (SSA_NAME_VAR (ptr)) == PARM_DECL
- || TREE_CODE (SSA_NAME_VAR (ptr)) == RESULT_DECL))
- p = SSA_NAME_VAR (ptr);
- varinfo_t vi = lookup_vi_for_tree (p);
- if (!vi)
- continue;
- vi = get_varinfo (find (vi->id));
- bitmap_iterator bi;
- unsigned j;
- varinfo_t restrict_var = NULL;
- EXECUTE_IF_SET_IN_BITMAP (vi->solution, 0, j, bi)
- {
- varinfo_t oi = get_varinfo (j);
- if (oi->head != j)
- oi = get_varinfo (oi->head);
- if (oi->is_restrict_var)
- {
- if (restrict_var
- && restrict_var != oi)
- {
- if (dump_file && (dump_flags & TDF_DETAILS))
- {
- fprintf (dump_file, "found restrict pointed-to "
- "for ");
- print_generic_expr (dump_file, ptr);
- fprintf (dump_file, " but not exclusively\n");
- }
- restrict_var = NULL;
- break;
- }
- restrict_var = oi;
- }
- /* NULL is the only other valid points-to entry. */
- else if (oi->id != nothing_id)
- {
- restrict_var = NULL;
- break;
- }
- }
- /* Ok, found that ptr must(!) point to a single(!) restrict
- variable. */
- /* ??? PTA isn't really a proper propagation engine to compute
- this property.
- ??? We could handle merging of two restricts by unifying them. */
- if (restrict_var)
- {
- /* Now look at possible dereferences of ptr. */
- imm_use_iterator ui;
- gimple *use_stmt;
- bool used = false;
- msdi_data data = { ptr, &clique, &last_ruid, restrict_var };
- FOR_EACH_IMM_USE_STMT (use_stmt, ui, ptr)
- used |= walk_stmt_load_store_ops (use_stmt, &data,
- maybe_set_dependence_info,
- maybe_set_dependence_info);
- if (used)
- {
- /* Add all subvars to the set of restrict pointed-to set. */
- for (unsigned sv = restrict_var->head; sv != 0;
- sv = get_varinfo (sv)->next)
- bitmap_set_bit (rvars, sv);
- varinfo_t escaped = get_varinfo (find (escaped_id));
- if (bitmap_bit_p (escaped->solution, restrict_var->id))
- escaped_p = true;
- }
- }
- }
-
- if (clique != 0)
- {
- /* Assign the BASE id zero to all accesses not based on a restrict
- pointer. That way they get disambiguated against restrict
- accesses but not against each other. */
- /* ??? For restricts derived from globals (thus not incoming
- parameters) we can't restrict scoping properly thus the following
- is too aggressive there. For now we have excluded those globals from
- getting into the MR_DEPENDENCE machinery. */
- vls_data data = { clique, escaped_p, rvars };
- basic_block bb;
- FOR_EACH_BB_FN (bb, cfun)
- for (gimple_stmt_iterator gsi = gsi_start_bb (bb);
- !gsi_end_p (gsi); gsi_next (&gsi))
- {
- gimple *stmt = gsi_stmt (gsi);
- walk_stmt_load_store_ops (stmt, &data,
- visit_loadstore, visit_loadstore);
- }
- }
-
- BITMAP_FREE (rvars);
-}
-
-/* Compute points-to information for every SSA_NAME pointer in the
- current function and compute the transitive closure of escaped
- variables to re-initialize the call-clobber states of local variables. */
-
-unsigned int
-compute_may_aliases (void)
-{
- if (cfun->gimple_df->ipa_pta)
- {
- if (dump_file)
- {
- fprintf (dump_file, "\nNot re-computing points-to information "
- "because IPA points-to information is available.\n\n");
-
- /* But still dump what we have remaining it. */
- dump_alias_info (dump_file);
- }
-
- return 0;
- }
-
- /* For each pointer P_i, determine the sets of variables that P_i may
- point-to. Compute the reachability set of escaped and call-used
- variables. */
- compute_points_to_sets ();
-
- /* Debugging dumps. */
- if (dump_file)
- dump_alias_info (dump_file);
-
- /* Compute restrict-based memory disambiguations. */
- compute_dependence_clique ();
-
- /* Deallocate memory used by aliasing data structures and the internal
- points-to solution. */
- delete_points_to_sets ();
-
- gcc_assert (!need_ssa_update_p (cfun));
-
- return 0;
-}
-
-/* A dummy pass to cause points-to information to be computed via
- TODO_rebuild_alias. */
-
-namespace {
-
-const pass_data pass_data_build_alias =
-{
- GIMPLE_PASS, /* type */
- "alias", /* name */
- OPTGROUP_NONE, /* optinfo_flags */
- TV_NONE, /* tv_id */
- ( PROP_cfg | PROP_ssa ), /* properties_required */
- 0, /* properties_provided */
- 0, /* properties_destroyed */
- 0, /* todo_flags_start */
- TODO_rebuild_alias, /* todo_flags_finish */
-};
-
-class pass_build_alias : public gimple_opt_pass
-{
-public:
- pass_build_alias (gcc::context *ctxt)
- : gimple_opt_pass (pass_data_build_alias, ctxt)
- {}
-
- /* opt_pass methods: */
- virtual bool gate (function *) { return flag_tree_pta; }
-
-}; // class pass_build_alias
-
-} // anon namespace
-
-gimple_opt_pass *
-make_pass_build_alias (gcc::context *ctxt)
-{
- return new pass_build_alias (ctxt);
-}
-
-/* A dummy pass to cause points-to information to be computed via
- TODO_rebuild_alias. */
-
-namespace {
-
-const pass_data pass_data_build_ealias =
-{
- GIMPLE_PASS, /* type */
- "ealias", /* name */
- OPTGROUP_NONE, /* optinfo_flags */
- TV_NONE, /* tv_id */
- ( PROP_cfg | PROP_ssa ), /* properties_required */
- 0, /* properties_provided */
- 0, /* properties_destroyed */
- 0, /* todo_flags_start */
- TODO_rebuild_alias, /* todo_flags_finish */
-};
-
-class pass_build_ealias : public gimple_opt_pass
-{
-public:
- pass_build_ealias (gcc::context *ctxt)
- : gimple_opt_pass (pass_data_build_ealias, ctxt)
- {}
-
- /* opt_pass methods: */
- virtual bool gate (function *) { return flag_tree_pta; }
-
-}; // class pass_build_ealias
-
-} // anon namespace
-
-gimple_opt_pass *
-make_pass_build_ealias (gcc::context *ctxt)
-{
- return new pass_build_ealias (ctxt);
-}
-
-
-/* IPA PTA solutions for ESCAPED. */
-struct pt_solution ipa_escaped_pt
- = { true, false, false, false, false,
- false, false, false, false, false, NULL };
-
-/* Associate node with varinfo DATA. Worker for
- cgraph_for_symbol_thunks_and_aliases. */
-static bool
-associate_varinfo_to_alias (struct cgraph_node *node, void *data)
-{
- if ((node->alias
- || (node->thunk
- && ! node->inlined_to))
- && node->analyzed
- && !node->ifunc_resolver)
- insert_vi_for_tree (node->decl, (varinfo_t)data);
- return false;
-}
-
-/* Dump varinfo VI to FILE. */
-
-static void
-dump_varinfo (FILE *file, varinfo_t vi)
-{
- if (vi == NULL)
- return;
-
- fprintf (file, "%u: %s\n", vi->id, vi->name);
-
- const char *sep = " ";
- if (vi->is_artificial_var)
- fprintf (file, "%sartificial", sep);
- if (vi->is_special_var)
- fprintf (file, "%sspecial", sep);
- if (vi->is_unknown_size_var)
- fprintf (file, "%sunknown-size", sep);
- if (vi->is_full_var)
- fprintf (file, "%sfull", sep);
- if (vi->is_heap_var)
- fprintf (file, "%sheap", sep);
- if (vi->may_have_pointers)
- fprintf (file, "%smay-have-pointers", sep);
- if (vi->only_restrict_pointers)
- fprintf (file, "%sonly-restrict-pointers", sep);
- if (vi->is_restrict_var)
- fprintf (file, "%sis-restrict-var", sep);
- if (vi->is_global_var)
- fprintf (file, "%sglobal", sep);
- if (vi->is_ipa_escape_point)
- fprintf (file, "%sipa-escape-point", sep);
- if (vi->is_fn_info)
- fprintf (file, "%sfn-info", sep);
- if (vi->ruid)
- fprintf (file, "%srestrict-uid:%u", sep, vi->ruid);
- if (vi->next)
- fprintf (file, "%snext:%u", sep, vi->next);
- if (vi->head != vi->id)
- fprintf (file, "%shead:%u", sep, vi->head);
- if (vi->offset)
- fprintf (file, "%soffset:" HOST_WIDE_INT_PRINT_DEC, sep, vi->offset);
- if (vi->size != ~(unsigned HOST_WIDE_INT)0)
- fprintf (file, "%ssize:" HOST_WIDE_INT_PRINT_DEC, sep, vi->size);
- if (vi->fullsize != ~(unsigned HOST_WIDE_INT)0
- && vi->fullsize != vi->size)
- fprintf (file, "%sfullsize:" HOST_WIDE_INT_PRINT_DEC, sep,
- vi->fullsize);
- fprintf (file, "\n");
-
- if (vi->solution && !bitmap_empty_p (vi->solution))
- {
- bitmap_iterator bi;
- unsigned i;
- fprintf (file, " solution: {");
- EXECUTE_IF_SET_IN_BITMAP (vi->solution, 0, i, bi)
- fprintf (file, " %u", i);
- fprintf (file, " }\n");
- }
-
- if (vi->oldsolution && !bitmap_empty_p (vi->oldsolution)
- && !bitmap_equal_p (vi->solution, vi->oldsolution))
- {
- bitmap_iterator bi;
- unsigned i;
- fprintf (file, " oldsolution: {");
- EXECUTE_IF_SET_IN_BITMAP (vi->oldsolution, 0, i, bi)
- fprintf (file, " %u", i);
- fprintf (file, " }\n");
- }
-}
-
-/* Dump varinfo VI to stderr. */
-
-DEBUG_FUNCTION void
-debug_varinfo (varinfo_t vi)
-{
- dump_varinfo (stderr, vi);
-}
-
-/* Dump varmap to FILE. */
-
-static void
-dump_varmap (FILE *file)
-{
- if (varmap.length () == 0)
- return;
-
- fprintf (file, "variables:\n");
-
- for (unsigned int i = 0; i < varmap.length (); ++i)
- {
- varinfo_t vi = get_varinfo (i);
- dump_varinfo (file, vi);
- }
-
- fprintf (file, "\n");
-}
-
-/* Dump varmap to stderr. */
-
-DEBUG_FUNCTION void
-debug_varmap (void)
-{
- dump_varmap (stderr);
-}
-
-/* Compute whether node is refered to non-locally. Worker for
- cgraph_for_symbol_thunks_and_aliases. */
-static bool
-refered_from_nonlocal_fn (struct cgraph_node *node, void *data)
-{
- bool *nonlocal_p = (bool *)data;
- *nonlocal_p |= (node->used_from_other_partition
- || DECL_EXTERNAL (node->decl)
- || TREE_PUBLIC (node->decl)
- || node->force_output
- || lookup_attribute ("noipa", DECL_ATTRIBUTES (node->decl)));
- return false;
-}
-
-/* Same for varpool nodes. */
-static bool
-refered_from_nonlocal_var (struct varpool_node *node, void *data)
-{
- bool *nonlocal_p = (bool *)data;
- *nonlocal_p |= (node->used_from_other_partition
- || DECL_EXTERNAL (node->decl)
- || TREE_PUBLIC (node->decl)
- || node->force_output);
- return false;
-}
-
-/* Execute the driver for IPA PTA. */
-static unsigned int
-ipa_pta_execute (void)
-{
- struct cgraph_node *node;
- varpool_node *var;
- unsigned int from = 0;
-
- in_ipa_mode = 1;
-
- init_alias_vars ();
-
- if (dump_file && (dump_flags & TDF_DETAILS))
- {
- symtab->dump (dump_file);
- fprintf (dump_file, "\n");
- }
-
- if (dump_file)
- {
- fprintf (dump_file, "Generating generic constraints\n\n");
- dump_constraints (dump_file, from);
- fprintf (dump_file, "\n");
- from = constraints.length ();
- }
-
- /* Build the constraints. */
- FOR_EACH_DEFINED_FUNCTION (node)
- {
- varinfo_t vi;
- /* Nodes without a body in this partition are not interesting.
- Especially do not visit clones at this point for now - we
- get duplicate decls there for inline clones at least. */
- if (!node->has_gimple_body_p ()
- || node->in_other_partition
- || node->inlined_to)
- continue;
- node->get_body ();
-
- gcc_assert (!node->clone_of);
-
- /* For externally visible or attribute used annotated functions use
- local constraints for their arguments.
- For local functions we see all callers and thus do not need initial
- constraints for parameters. */
- bool nonlocal_p = (node->used_from_other_partition
- || DECL_EXTERNAL (node->decl)
- || TREE_PUBLIC (node->decl)
- || node->force_output
- || lookup_attribute ("noipa",
- DECL_ATTRIBUTES (node->decl)));
- node->call_for_symbol_thunks_and_aliases (refered_from_nonlocal_fn,
- &nonlocal_p, true);
-
- vi = create_function_info_for (node->decl,
- alias_get_name (node->decl), false,
- nonlocal_p);
- if (dump_file
- && from != constraints.length ())
- {
- fprintf (dump_file,
- "Generating initial constraints for %s",
- node->dump_name ());
- if (DECL_ASSEMBLER_NAME_SET_P (node->decl))
- fprintf (dump_file, " (%s)",
- IDENTIFIER_POINTER
- (DECL_ASSEMBLER_NAME (node->decl)));
- fprintf (dump_file, "\n\n");
- dump_constraints (dump_file, from);
- fprintf (dump_file, "\n");
-
- from = constraints.length ();
- }
-
- node->call_for_symbol_thunks_and_aliases
- (associate_varinfo_to_alias, vi, true);
- }
-
- /* Create constraints for global variables and their initializers. */
- FOR_EACH_VARIABLE (var)
- {
- if (var->alias && var->analyzed)
- continue;
-
- varinfo_t vi = get_vi_for_tree (var->decl);
-
- /* For the purpose of IPA PTA unit-local globals are not
- escape points. */
- bool nonlocal_p = (DECL_EXTERNAL (var->decl)
- || TREE_PUBLIC (var->decl)
- || var->used_from_other_partition
- || var->force_output);
- var->call_for_symbol_and_aliases (refered_from_nonlocal_var,
- &nonlocal_p, true);
- if (nonlocal_p)
- vi->is_ipa_escape_point = true;
- }
-
- if (dump_file
- && from != constraints.length ())
- {
- fprintf (dump_file,
- "Generating constraints for global initializers\n\n");
- dump_constraints (dump_file, from);
- fprintf (dump_file, "\n");
- from = constraints.length ();
- }
-
- FOR_EACH_DEFINED_FUNCTION (node)
- {
- struct function *func;
- basic_block bb;
-
- /* Nodes without a body in this partition are not interesting. */
- if (!node->has_gimple_body_p ()
- || node->in_other_partition
- || node->clone_of)
- continue;
-
- if (dump_file)
- {
- fprintf (dump_file,
- "Generating constraints for %s", node->dump_name ());
- if (DECL_ASSEMBLER_NAME_SET_P (node->decl))
- fprintf (dump_file, " (%s)",
- IDENTIFIER_POINTER
- (DECL_ASSEMBLER_NAME (node->decl)));
- fprintf (dump_file, "\n");
- }
-
- func = DECL_STRUCT_FUNCTION (node->decl);
- gcc_assert (cfun == NULL);
-
- /* Build constriants for the function body. */
- FOR_EACH_BB_FN (bb, func)
- {
- for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi);
- gsi_next (&gsi))
- {
- gphi *phi = gsi.phi ();
-
- if (! virtual_operand_p (gimple_phi_result (phi)))
- find_func_aliases (func, phi);
- }
-
- for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);
- gsi_next (&gsi))
- {
- gimple *stmt = gsi_stmt (gsi);
-
- find_func_aliases (func, stmt);
- find_func_clobbers (func, stmt);
- }
- }
-
- if (dump_file)
- {
- fprintf (dump_file, "\n");
- dump_constraints (dump_file, from);
- fprintf (dump_file, "\n");
- from = constraints.length ();
- }
- }
-
- /* From the constraints compute the points-to sets. */
- solve_constraints ();
-
- if (dump_file)
- dump_sa_points_to_info (dump_file);
-
- /* Now post-process solutions to handle locals from different
- runtime instantiations coming in through recursive invocations. */
- unsigned shadow_var_cnt = 0;
- for (unsigned i = 1; i < varmap.length (); ++i)
- {
- varinfo_t fi = get_varinfo (i);
- if (fi->is_fn_info
- && fi->decl)
- /* Automatic variables pointed to by their containing functions
- parameters need this treatment. */
- for (varinfo_t ai = first_vi_for_offset (fi, fi_parm_base);
- ai; ai = vi_next (ai))
- {
- varinfo_t vi = get_varinfo (find (ai->id));
- bitmap_iterator bi;
- unsigned j;
- EXECUTE_IF_SET_IN_BITMAP (vi->solution, 0, j, bi)
- {
- varinfo_t pt = get_varinfo (j);
- if (pt->shadow_var_uid == 0
- && pt->decl
- && auto_var_in_fn_p (pt->decl, fi->decl))
- {
- pt->shadow_var_uid = allocate_decl_uid ();
- shadow_var_cnt++;
- }
- }
- }
- /* As well as global variables which are another way of passing
- arguments to recursive invocations. */
- else if (fi->is_global_var)
- {
- for (varinfo_t ai = fi; ai; ai = vi_next (ai))
- {
- varinfo_t vi = get_varinfo (find (ai->id));
- bitmap_iterator bi;
- unsigned j;
- EXECUTE_IF_SET_IN_BITMAP (vi->solution, 0, j, bi)
- {
- varinfo_t pt = get_varinfo (j);
- if (pt->shadow_var_uid == 0
- && pt->decl
- && auto_var_p (pt->decl))
- {
- pt->shadow_var_uid = allocate_decl_uid ();
- shadow_var_cnt++;
- }
- }
- }
- }
- }
- if (shadow_var_cnt && dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, "Allocated %u shadow variables for locals "
- "maybe leaking into recursive invocations of their containing "
- "functions\n", shadow_var_cnt);
-
- /* Compute the global points-to sets for ESCAPED.
- ??? Note that the computed escape set is not correct
- for the whole unit as we fail to consider graph edges to
- externally visible functions. */
- ipa_escaped_pt = find_what_var_points_to (NULL, get_varinfo (escaped_id));
-
- /* Make sure the ESCAPED solution (which is used as placeholder in
- other solutions) does not reference itself. This simplifies
- points-to solution queries. */
- ipa_escaped_pt.ipa_escaped = 0;
-
- /* Assign the points-to sets to the SSA names in the unit. */
- FOR_EACH_DEFINED_FUNCTION (node)
- {
- tree ptr;
- struct function *fn;
- unsigned i;
- basic_block bb;
-
- /* Nodes without a body in this partition are not interesting. */
- if (!node->has_gimple_body_p ()
- || node->in_other_partition
- || node->clone_of)
- continue;
-
- fn = DECL_STRUCT_FUNCTION (node->decl);
-
- /* Compute the points-to sets for pointer SSA_NAMEs. */
- FOR_EACH_VEC_ELT (*fn->gimple_df->ssa_names, i, ptr)
- {
- if (ptr
- && POINTER_TYPE_P (TREE_TYPE (ptr)))
- find_what_p_points_to (node->decl, ptr);
- }
-
- /* Compute the call-use and call-clobber sets for indirect calls
- and calls to external functions. */
- FOR_EACH_BB_FN (bb, fn)
- {
- gimple_stmt_iterator gsi;
-
- for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
- {
- gcall *stmt;
- struct pt_solution *pt;
- varinfo_t vi, fi;
- tree decl;
-
- stmt = dyn_cast <gcall *> (gsi_stmt (gsi));
- if (!stmt)
- continue;
-
- /* Handle direct calls to functions with body. */
- decl = gimple_call_fndecl (stmt);
-
- {
- tree called_decl = NULL_TREE;
- if (gimple_call_builtin_p (stmt, BUILT_IN_GOMP_PARALLEL))
- called_decl = TREE_OPERAND (gimple_call_arg (stmt, 0), 0);
- else if (gimple_call_builtin_p (stmt, BUILT_IN_GOACC_PARALLEL))
- called_decl = TREE_OPERAND (gimple_call_arg (stmt, 1), 0);
-
- if (called_decl != NULL_TREE
- && !fndecl_maybe_in_other_partition (called_decl))
- decl = called_decl;
- }
-
- if (decl
- && (fi = lookup_vi_for_tree (decl))
- && fi->is_fn_info)
- {
- *gimple_call_clobber_set (stmt)
- = find_what_var_points_to
- (node->decl, first_vi_for_offset (fi, fi_clobbers));
- *gimple_call_use_set (stmt)
- = find_what_var_points_to
- (node->decl, first_vi_for_offset (fi, fi_uses));
- }
- /* Handle direct calls to external functions. */
- else if (decl && (!fi || fi->decl))
- {
- pt = gimple_call_use_set (stmt);
- if (gimple_call_flags (stmt) & ECF_CONST)
- memset (pt, 0, sizeof (struct pt_solution));
- else if ((vi = lookup_call_use_vi (stmt)) != NULL)
- {
- *pt = find_what_var_points_to (node->decl, vi);
- /* Escaped (and thus nonlocal) variables are always
- implicitly used by calls. */
- /* ??? ESCAPED can be empty even though NONLOCAL
- always escaped. */
- pt->nonlocal = 1;
- pt->ipa_escaped = 1;
- }
- else
- {
- /* If there is nothing special about this call then
- we have made everything that is used also escape. */
- *pt = ipa_escaped_pt;
- pt->nonlocal = 1;
- }
-
- pt = gimple_call_clobber_set (stmt);
- if (gimple_call_flags (stmt) & (ECF_CONST|ECF_PURE|ECF_NOVOPS))
- memset (pt, 0, sizeof (struct pt_solution));
- else if ((vi = lookup_call_clobber_vi (stmt)) != NULL)
- {
- *pt = find_what_var_points_to (node->decl, vi);
- /* Escaped (and thus nonlocal) variables are always
- implicitly clobbered by calls. */
- /* ??? ESCAPED can be empty even though NONLOCAL
- always escaped. */
- pt->nonlocal = 1;
- pt->ipa_escaped = 1;
- }
- else
- {
- /* If there is nothing special about this call then
- we have made everything that is used also escape. */
- *pt = ipa_escaped_pt;
- pt->nonlocal = 1;
- }
- }
- /* Handle indirect calls. */
- else if ((fi = get_fi_for_callee (stmt)))
- {
- /* We need to accumulate all clobbers/uses of all possible
- callees. */
- fi = get_varinfo (find (fi->id));
- /* If we cannot constrain the set of functions we'll end up
- calling we end up using/clobbering everything. */
- if (bitmap_bit_p (fi->solution, anything_id)
- || bitmap_bit_p (fi->solution, nonlocal_id)
- || bitmap_bit_p (fi->solution, escaped_id))
- {
- pt_solution_reset (gimple_call_clobber_set (stmt));
- pt_solution_reset (gimple_call_use_set (stmt));
- }
- else
- {
- bitmap_iterator bi;
- unsigned i;
- struct pt_solution *uses, *clobbers;
-
- uses = gimple_call_use_set (stmt);
- clobbers = gimple_call_clobber_set (stmt);
- memset (uses, 0, sizeof (struct pt_solution));
- memset (clobbers, 0, sizeof (struct pt_solution));
- EXECUTE_IF_SET_IN_BITMAP (fi->solution, 0, i, bi)
- {
- struct pt_solution sol;
-
- vi = get_varinfo (i);
- if (!vi->is_fn_info)
- {
- /* ??? We could be more precise here? */
- uses->nonlocal = 1;
- uses->ipa_escaped = 1;
- clobbers->nonlocal = 1;
- clobbers->ipa_escaped = 1;
- continue;
- }
-
- if (!uses->anything)
- {
- sol = find_what_var_points_to
- (node->decl,
- first_vi_for_offset (vi, fi_uses));
- pt_solution_ior_into (uses, &sol);
- }
- if (!clobbers->anything)
- {
- sol = find_what_var_points_to
- (node->decl,
- first_vi_for_offset (vi, fi_clobbers));
- pt_solution_ior_into (clobbers, &sol);
- }
- }
- }
- }
- else
- gcc_unreachable ();
- }
- }
-
- fn->gimple_df->ipa_pta = true;
-
- /* We have to re-set the final-solution cache after each function
- because what is a "global" is dependent on function context. */
- final_solutions->empty ();
- obstack_free (&final_solutions_obstack, NULL);
- gcc_obstack_init (&final_solutions_obstack);
- }
-
- delete_points_to_sets ();
-
- in_ipa_mode = 0;
-
- return 0;
-}
-
-namespace {
-
-const pass_data pass_data_ipa_pta =
-{
- SIMPLE_IPA_PASS, /* type */
- "pta", /* name */
- OPTGROUP_NONE, /* optinfo_flags */
- TV_IPA_PTA, /* tv_id */
- 0, /* properties_required */
- 0, /* properties_provided */
- 0, /* properties_destroyed */
- 0, /* todo_flags_start */
- 0, /* todo_flags_finish */
-};
-
-class pass_ipa_pta : public simple_ipa_opt_pass
-{
-public:
- pass_ipa_pta (gcc::context *ctxt)
- : simple_ipa_opt_pass (pass_data_ipa_pta, ctxt)
- {}
-
- /* opt_pass methods: */
- virtual bool gate (function *)
- {
- return (optimize
- && flag_ipa_pta
- /* Don't bother doing anything if the program has errors. */
- && !seen_error ());
- }
-
- opt_pass * clone () { return new pass_ipa_pta (m_ctxt); }
-
- virtual unsigned int execute (function *) { return ipa_pta_execute (); }
-
-}; // class pass_ipa_pta
-
-} // anon namespace
-
-simple_ipa_opt_pass *
-make_pass_ipa_pta (gcc::context *ctxt)
-{
- return new pass_ipa_pta (ctxt);
-}
generated by cgit v1.1 at 2025-05-28 12:49:49 +0000