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2019-02-01runtime: add hurd netpoll and semaphore supportIan Lance Taylor1-1/+1
Patch by Svante Signell. Reviewed-on: https://go-review.googlesource.com/c/160827 From-SVN: r268465
2019-02-01runtime: add getproccount for hurdIan Lance Taylor1-1/+1
Patch by Svante Signell. Reviewed-on: https://go-review.googlesource.com/c/160825 From-SVN: r268463
2019-02-01libgo: add configury and sysinfo support for hurdIan Lance Taylor1-1/+1
Patch by Svante Signell. Reviewed-on: https://go-review.googlesource.com/c/160824 From-SVN: r268461
2019-02-01libgo: add hurd build tags to test filesIan Lance Taylor1-1/+1
Patch by Svante Signell. Reviewed-on: https://go-review.googlesource.com/c/160823 From-SVN: r268460
2019-02-01libgo: add hurd build tagsIan Lance Taylor1-1/+1
Patch by Svante Signell. Reviewed-on: https://go-review.googlesource.com/c/160822 From-SVN: r268459
2019-02-01runtime, sync: use __atomic intrinsics instead of __syncIan Lance Taylor1-1/+1
GCC has supported the __atomic intrinsics since 4.7. They are better than the __sync intrinsics in that they specify a memory model and, more importantly for our purposes, they are reliably implemented either in the compiler or in libatomic. Fixes https://gcc.gnu.org/PR52084 Reviewed-on: https://go-review.googlesource.com/c/160820 From-SVN: r268458
2019-02-01compiler: support alias to pointer type as receiver in method declarationIan Lance Taylor2-1/+9
Fixes golang/go#27994. Reviewed-on: https://go-review.googlesource.com/c/160459 From-SVN: r268450
2019-01-30compiler: support alias to pointer type as method receiverIan Lance Taylor2-1/+5
Fixes golang/go#28252. Reviewed-on: https://go-review.googlesource.com/c/160077 From-SVN: r268397
2019-01-29runtime: fix sigprof frame countingIan Lance Taylor1-1/+1
If sigtramp and sigtrampgo are both on stack, n -= framesToDiscard is executed twice, which should actually run only once. Reviewed-on: https://go-review.googlesource.com/c/159238 From-SVN: r268366
2019-01-29runtime: use the call instruction's PC for panic-in-runtime detectionIan Lance Taylor1-1/+1
If a panic happens in the runtime we turn that into a fatal error. We use the caller's PC to determine if the panic call is inside the runtime. getcallerpc returns the PC immediately after the call instruction. If the call is the very last instruction of a function, it may not find this PC belong to a runtime function, giving false result. We need to back off the PC by 1 to the call instruction. The gc runtime doesn't do this because the gc compiler always emit an instruction following a panic call, presumably an UNDEF instruction which turns into an architecture-specific illegal instruction. Our compiler doesn't do this. Reviewed-on: https://go-review.googlesource.com/c/159437 From-SVN: r268358
2019-01-28compiler: improve recursive type detectionIan Lance Taylor2-1/+10
Detect recursive type definition like "type T0 T1; type T1 T2; ...... type Tn T0". Fixes golang/go#25320. Reviewed-on: https://go-review.googlesource.com/c/159837 From-SVN: r268347
2019-01-24runtime: install SIGURG handler on C created threadsIan Lance Taylor1-1/+1
Precise stack scan uses SIGURG to trigger a stack scan. We need to have Go signal handler installed for SIGURG. Reviewed-on: https://go-review.googlesource.com/c/159097 From-SVN: r268230
2019-01-22golang.org/x/tools/go/analysis: pass "gccgo" to types.SizesForIan Lance Taylor1-1/+1
For the gofrontend copy, change calls to types.SizesFor to pass "gccgo" rather than "gc". Leave the asmdecl pass unchanged since that pass is gc-specific anyhow. This has been fixed in a better way in the external repo by https://golang.org/cl/158317 and friends, but that is not in 1.12, so use this approach for now. Reviewed-on: https://go-review.googlesource.com/c/158842 From-SVN: r268153
2019-01-22re PR go/88927 (Bootstrap failure on arm in libgo starting with r268084)Ian Lance Taylor1-1/+1
PR go/88927 runtime, internal/cpu: fix build for ARM GNU/Linux Was failing with ../../../libgo/go/internal/cpu/cpu.go:138:2: error: reference to undefined name 'doinit' 138 | doinit() | ^ Fix it by adding in Go 1.12 internal/cpu/cpu_arm.go, and the code in runtime that initializes the values. Fixes https://gcc.gnu.org/PR88927. Reviewed-on: https://go-review.googlesource.com/c/158717 From-SVN: r268131
2019-01-21libgo: fix building, and some testing, on SolarisIan Lance Taylor1-1/+1
Restore some of the fixes that were applied to golang_org/x/net/lif but were lost when 1.12 moved the directory to internal/x/net/lif. Add support for reading /proc to fetch argc/argv/env for c-archive mode. Reviewed-on: https://go-review.googlesource.com/c/158640 From-SVN: r268130
2019-01-21compiler: stop iterator on errorIan Lance Taylor2-1/+2
If there is an error reading or parsing an archive header, the Archive_iterator code would return a dummy header but would not mark itself as done. The effect is that an invalid archive leads to an endless loop reading and re-reading the same archive header. Avoid that by setting the offset to the end of the file, which will cause the iterator to == archive_end. No test since it doesn't seem worth constructing an invalid archive. Reviewed-on: https://go-review.googlesource.com/c/158217 From-SVN: r268129
2019-01-18libgo: update to Go1.12beta2Ian Lance Taylor1-1/+1
Reviewed-on: https://go-review.googlesource.com/c/158019 gotools/: * Makefile.am (go_cmd_vet_files): Update for Go1.12beta2 release. (GOTOOLS_TEST_TIMEOUT): Increase to 600. (check-runtime): Export LD_LIBRARY_PATH before computing GOARCH and GOOS. (check-vet): Copy golang.org/x/tools into check-vet-dir. * Makefile.in: Regenerate. gcc/testsuite/: * go.go-torture/execute/names-1.go: Stop using debug/xcoff, which is no longer externally visible. From-SVN: r268084
2019-01-18re PR go/88202 (FAIL: runtime/pprof)Ian Lance Taylor1-1/+1
PR go/88202 runtime: in sigprof, skip to sigtrampgo if we don't find sigtramp Fixes https://gcc.gnu.org/PR88202 Reviewed-on: https://go-review.googlesource.com/c/158218 From-SVN: r268057
2019-01-17runtime: dropg before CAS g status to _Grunnable/_GwaitingIan Lance Taylor1-1/+1
Currently, we dropg (which clears gp.m) after we CAS the g status to _Grunnable or _Gwaiting. Immediately after CASing the g status, another thread may CAS it to _Gscan status and scan its stack. With precise stack scan, it accesses gp.m in order to switch to g and back (in doscanstackswitch). This races with dropg. If doscanstackswitch reads gp.m, then dropg runs, when we restore the m at the end of the scan it will set to a stale value. Worse, if dropg runs after doscanstackswitch sets the new m, gp will be running with a nil m. To fix this, we do dropg before CAS g status to _Grunnable or _Gwaiting. We can do this safely if we are CASing from _Grunning, as we own the g when it is in _Grunning. There is one case where we CAS from _Gsyscall to _Grunnable. It is not safe to dropg when it is in _Gsyscall, as precise stack scan needs to read gp.m in order to signal the m. So we need to introduce a transient state, _Gexitingsyscall, between _Gsyscall and _Grunnable, where the GC should not scan its stack. In is a little unfortunate that we have to add another g status. We could reuse an existing one (e.g. _Gcopystack), but it is clearer and safer to just use a new one, as Austin suggested. Reviewed-on: https://go-review.googlesource.com/c/158157 From-SVN: r268001
2019-01-16syscall: mark C syscall functions noescapeIan Lance Taylor1-1/+1
Many C syscall functions take pointer arguments. The pointers don't escape in the C functions. Mark the C functions noescape so calling them doesn't need allocation. Reviewed-on: https://go-review.googlesource.com/c/158158 From-SVN: r267989
2019-01-15runtime: add padding to FFI type of struct ending with zero-sized fieldIan Lance Taylor1-1/+1
CL 157557 changes the compiler to add one byte padding to non-empty struct ending with a zero-sized field. Add the same padding to the FFI type, so reflect.Call works. This fixes test/fixedbugs/issue26335.go in the main repo. Reviewed-on: https://go-review.googlesource.com/c/158018 From-SVN: r267956
2019-01-15compiler, runtime: panic on uncomparable map key, even if map is emptyIan Lance Taylor3-25/+61
This ports https://golang.org/cl/155918 from the master repo. runtime: panic on uncomparable map key, even if map is empty Reorg map flags a bit so we don't need any extra space for the extra flag. This is a pre-req for updating libgo to the Go 1.12beta2 release. Reviewed-on: https://go-review.googlesource.com/c/157858 From-SVN: r267950
2019-01-11compiler: pad structs ending with zero-sized fieldIan Lance Taylor4-11/+46
For a struct with zero-sized last field, the address of the field falls out of the object boundary, which confuses the garbage collector. Pad an extra byte in this case. Reviewed-on: https://go-review.googlesource.com/c/157557 From-SVN: r267861
2019-01-09re PR go/86343 (types built by GO share TYPE_FIELDS in unsupported way)Ian Lance Taylor2-1/+12
PR go/86343 * go-gcc.cc (Gcc_backend::set_placeholder_struct_type): Go back to build_distinct_type_copy, but copy the fields so that they have the right DECL_CONTEXT. From-SVN: r267789
2019-01-09PR other/16615 [1/5]Sandra Loosemore3-3/+10
2019-01-09 Sandra Loosemore <sandra@codesourcery.com> PR other/16615 [1/5] contrib/ * mklog: Mechanically replace "can not" with "cannot". gcc/ * Makefile.in: Mechanically replace "can not" with "cannot". * alias.c: Likewise. * builtins.c: Likewise. * calls.c: Likewise. * cgraph.c: Likewise. * cgraph.h: Likewise. * cgraphclones.c: Likewise. * cgraphunit.c: Likewise. * combine-stack-adj.c: Likewise. * combine.c: Likewise. * common/config/i386/i386-common.c: Likewise. * config/aarch64/aarch64.c: Likewise. * config/alpha/sync.md: Likewise. * config/arc/arc.c: Likewise. * config/arc/predicates.md: Likewise. * config/arm/arm-c.c: Likewise. * config/arm/arm.c: Likewise. * config/arm/arm.h: Likewise. * config/arm/arm.md: Likewise. * config/arm/cortex-r4f.md: Likewise. * config/csky/csky.c: Likewise. * config/csky/csky.h: Likewise. * config/darwin-f.c: Likewise. * config/epiphany/epiphany.md: Likewise. * config/i386/i386.c: Likewise. * config/i386/sol2.h: Likewise. * config/m68k/m68k.c: Likewise. * config/mcore/mcore.h: Likewise. * config/microblaze/microblaze.md: Likewise. * config/mips/20kc.md: Likewise. * config/mips/sb1.md: Likewise. * config/nds32/nds32.c: Likewise. * config/nds32/predicates.md: Likewise. * config/pa/pa.c: Likewise. * config/rs6000/e300c2c3.md: Likewise. * config/rs6000/rs6000.c: Likewise. * config/s390/s390.h: Likewise. * config/sh/sh.c: Likewise. * config/sh/sh.md: Likewise. * config/spu/vmx2spu.h: Likewise. * cprop.c: Likewise. * dbxout.c: Likewise. * df-scan.c: Likewise. * doc/cfg.texi: Likewise. * doc/extend.texi: Likewise. * doc/fragments.texi: Likewise. * doc/gty.texi: Likewise. * doc/invoke.texi: Likewise. * doc/lto.texi: Likewise. * doc/md.texi: Likewise. * doc/objc.texi: Likewise. * doc/rtl.texi: Likewise. * doc/tm.texi: Likewise. * dse.c: Likewise. * emit-rtl.c: Likewise. * emit-rtl.h: Likewise. * except.c: Likewise. * expmed.c: Likewise. * expr.c: Likewise. * fold-const.c: Likewise. * genautomata.c: Likewise. * gimple-fold.c: Likewise. * hard-reg-set.h: Likewise. * ifcvt.c: Likewise. * ipa-comdats.c: Likewise. * ipa-cp.c: Likewise. * ipa-devirt.c: Likewise. * ipa-fnsummary.c: Likewise. * ipa-icf.c: Likewise. * ipa-inline-transform.c: Likewise. * ipa-inline.c: Likewise. * ipa-polymorphic-call.c: Likewise. * ipa-profile.c: Likewise. * ipa-prop.c: Likewise. * ipa-pure-const.c: Likewise. * ipa-reference.c: Likewise. * ipa-split.c: Likewise. * ipa-visibility.c: Likewise. * ipa.c: Likewise. * ira-build.c: Likewise. * ira-color.c: Likewise. * ira-conflicts.c: Likewise. * ira-costs.c: Likewise. * ira-int.h: Likewise. * ira-lives.c: Likewise. * ira.c: Likewise. * ira.h: Likewise. * loop-invariant.c: Likewise. * loop-unroll.c: Likewise. * lower-subreg.c: Likewise. * lra-assigns.c: Likewise. * lra-constraints.c: Likewise. * lra-eliminations.c: Likewise. * lra-lives.c: Likewise. * lra-remat.c: Likewise. * lra-spills.c: Likewise. * lra.c: Likewise. * lto-cgraph.c: Likewise. * lto-streamer-out.c: Likewise. * postreload-gcse.c: Likewise. * predict.c: Likewise. * profile-count.h: Likewise. * profile.c: Likewise. * recog.c: Likewise. * ree.c: Likewise. * reload.c: Likewise. * reload1.c: Likewise. * reorg.c: Likewise. * resource.c: Likewise. * rtl.def: Likewise. * rtl.h: Likewise. * rtlanal.c: Likewise. * sched-deps.c: Likewise. * sched-ebb.c: Likewise. * sched-rgn.c: Likewise. * sel-sched-ir.c: Likewise. * sel-sched.c: Likewise. * shrink-wrap.c: Likewise. * simplify-rtx.c: Likewise. * symtab.c: Likewise. * target.def: Likewise. * toplev.c: Likewise. * tree-call-cdce.c: Likewise. * tree-cfg.c: Likewise. * tree-complex.c: Likewise. * tree-core.h: Likewise. * tree-eh.c: Likewise. * tree-inline.c: Likewise. * tree-loop-distribution.c: Likewise. * tree-nrv.c: Likewise. * tree-profile.c: Likewise. * tree-sra.c: Likewise. * tree-ssa-alias.c: Likewise. * tree-ssa-dce.c: Likewise. * tree-ssa-dom.c: Likewise. * tree-ssa-forwprop.c: Likewise. * tree-ssa-loop-im.c: Likewise. * tree-ssa-loop-ivcanon.c: Likewise. * tree-ssa-loop-ivopts.c: Likewise. * tree-ssa-loop-niter.c: Likewise. * tree-ssa-phionlycprop.c: Likewise. * tree-ssa-phiopt.c: Likewise. * tree-ssa-propagate.c: Likewise. * tree-ssa-threadedge.c: Likewise. * tree-ssa-threadupdate.c: Likewise. * tree-ssa-uninit.c: Likewise. * tree-ssanames.c: Likewise. * tree-streamer-out.c: Likewise. * tree.c: Likewise. * tree.h: Likewise. * vr-values.c: Likewise. gcc/ada/ * exp_ch9.adb: Mechanically replace "can not" with "cannot". * libgnat/s-regpat.ads: Likewise. * par-ch4.adb: Likewise. * set_targ.adb: Likewise. * types.ads: Likewise. gcc/cp/ * cp-tree.h: Mechanically replace "can not" with "cannot". * parser.c: Likewise. * pt.c: Likewise. gcc/fortran/ * class.c: Mechanically replace "can not" with "cannot". * decl.c: Likewise. * expr.c: Likewise. * gfc-internals.texi: Likewise. * intrinsic.texi: Likewise. * invoke.texi: Likewise. * io.c: Likewise. * match.c: Likewise. * parse.c: Likewise. * primary.c: Likewise. * resolve.c: Likewise. * symbol.c: Likewise. * trans-array.c: Likewise. * trans-decl.c: Likewise. * trans-intrinsic.c: Likewise. * trans-stmt.c: Likewise. gcc/go/ * go-backend.c: Mechanically replace "can not" with "cannot". * go-gcc.cc: Likewise. gcc/lto/ * lto-partition.c: Mechanically replace "can not" with "cannot". * lto-symtab.c: Likewise. * lto.c: Likewise. gcc/objc/ * objc-act.c: Mechanically replace "can not" with "cannot". libbacktrace/ * backtrace.h: Mechanically replace "can not" with "cannot". libgcc/ * config/c6x/libunwind.S: Mechanically replace "can not" with "cannot". * config/tilepro/atomic.h: Likewise. * config/vxlib-tls.c: Likewise. * generic-morestack-thread.c: Likewise. * generic-morestack.c: Likewise. * mkmap-symver.awk: Likewise. libgfortran/ * caf/single.c: Mechanically replace "can not" with "cannot". * io/unit.c: Likewise. libobjc/ * class.c: Mechanically replace "can not" with "cannot". * objc/runtime.h: Likewise. * sendmsg.c: Likewise. liboffloadmic/ * include/coi/common/COIResult_common.h: Mechanically replace "can not" with "cannot". * include/coi/source/COIBuffer_source.h: Likewise. libstdc++-v3/ * include/ext/bitmap_allocator.h: Mechanically replace "can not" with "cannot". From-SVN: r267783
2019-01-09compiler: use int type for len & cap in slice valueIan Lance Taylor2-3/+5
Slice value expression has backend type a struct of a pointer and two ints. Make sure the len and cap are converted to int when creating slice value expression. Reviewed-on: https://go-review.googlesource.com/c/156897 From-SVN: r267745
2019-01-07runtime: in doscanstackswitch, set gp->m before gogoIan Lance Taylor1-1/+1
This is following CL 156038. doscanstackswitch uses the same mechanism of switching goroutines as getTraceback, and so has the same problem as described in issue golang/go#29448. This CL applies the same fix. Reviewed-on: https://go-review.googlesource.com/c/156697 From-SVN: r267661
2019-01-07compiler: move slice construction to callers of makesliceIan Lance Taylor6-86/+161
This is the gccgo version of https://golang.org/cl/141822: Only return a pointer p to the new slices backing array from makeslice. Makeslice callers then construct sliceheader{p, len, cap} explictly instead of makeslice returning the slice. This change caused the GCC backend to break the runtime/pprof test by merging together the identical functions allocateReflectTransient and allocateTransient2M. This caused the traceback to be other than expected. Fix that by making the functions not identical. This is a step toward updating libgo to the Go1.12beta1 release. Reviewed-on: https://go-review.googlesource.com/c/155937 From-SVN: r267660
2019-01-07runtime: in getTraceback, set gp->m before gogoIan Lance Taylor1-1/+1
Currently, when collecting a traceback for another goroutine, getTraceback calls gogo(gp) switching to gp, which will resume in mcall, which will call gtraceback, which will set up gp->m. There is a gap between setting the current running g to gp and setting gp->m. If a profiling signal arrives in between, sigtramp will see a non-nil gp with a nil m, and will seg fault. Fix this by setting up gp->m first. Fixes golang/go#29448. Reviewed-on: https://go-review.googlesource.com/c/156038 From-SVN: r267658
2019-01-05runtime: prevent deadlock when profiling signal arrives during tracebackIan Lance Taylor1-1/+1
Traceback routines, e.g. callers and funcentry, may call __go_get_backtrace_state. If a profiling signal arrives while we are in the critical section of __go_get_backtrace_state, it tries to do a traceback, which also calls __go_get_backtrace_state, which tries to enter the same critical section and will deadlock. Prevent this deadlock by setting up runtime_in_callers before calling __go_get_backtrace_state. Found while investigating golang/go#29448. Will add a test in the next CL. Updates golang/go#29448. Reviewed-on: https://go-review.googlesource.com/c/156037 From-SVN: r267590
2019-01-01Update copyright years.Jakub Jelinek14-14/+16
From-SVN: r267494
2019-01-01gcc.c (process_command): Update copyright notice dates.Jakub Jelinek2-1/+5
* gcc.c (process_command): Update copyright notice dates. * gcov-dump.c (print_version): Ditto. * gcov.c (print_version): Ditto. * gcov-tool.c (print_version): Ditto. * gengtype.c (create_file): Ditto. * doc/cpp.texi: Bump @copying's copyright year. * doc/cppinternals.texi: Ditto. * doc/gcc.texi: Ditto. * doc/gccint.texi: Ditto. * doc/gcov.texi: Ditto. * doc/install.texi: Ditto. * doc/invoke.texi: Ditto. gcc/fortran/ * gfortranspec.c (lang_specific_driver): Update copyright notice dates. * gfc-internals.texi: Bump @copying's copyright year. * gfortran.texi: Ditto. * intrinsic.texi: Ditto. * invoke.texi: Ditto. gcc/go/ * gccgo.texi: Bump @copyrights-go year. gcc/ada/ * gnat_ugn.texi: Bump @copying's copyright year. * gnat_rm.texi: Likewise. gcc/d/ * gdc.texi: Bump @copyrights-d year. libitm/ * libitm.texi: Bump @copying's copyright year. libgomp/ * libgomp.texi: Bump @copying's copyright year. libquadmath/ * libquadmath.texi: Bump @copying's copyright year. From-SVN: r267492
2018-12-29runtime: prevent deadlock when profiling signal arrives in stack scanIan Lance Taylor1-1/+1
Precise stack scan needs to unwind the stack. When it is unwinding the stack, if a profiling signal arrives, which also does a traceback, it may deadlock in dl_iterate_phdr. Prevent this deadlock by setting up runtime_in_callers before traceback. Reviewed-on: https://go-review.googlesource.com/c/155766 From-SVN: r267457
2018-12-28compiler: remove escapes_ field from Variable and Result_variableIan Lance Taylor4-56/+10
The fields were set to true initially and never set to false. These were left over from an earlier attempt at escape analysis. Reviewed-on: https://go-review.googlesource.com/c/155750 From-SVN: r267455
2018-12-27runtime: delete export_arm_test.goIan Lance Taylor1-1/+1
The only thing export_arm_test.go does is to export usplit, which does not exist in gccgo. Reviewed-on: https://go-review.googlesource.com/c/155760 From-SVN: r267435
2018-12-27runtime: let ARM32 EABI personality function continue unwind when called ↵Ian Lance Taylor1-1/+1
from traceback On ARM32 EABI, unlike other platforms, the personality function is called during _Unwind_Backtrace (libgcc/unwind-arm-common.inc:581). In this case, simply unwind the frame without returning any handlers. Otherwise traceback will loop if there is a frame with a defer on stack. Reviewed-on: https://go-review.googlesource.com/c/155759 From-SVN: r267434
2018-12-27runtime: on ARM32 EABI, don't get LSDA if compact model is usedIan Lance Taylor1-1/+1
On ARM32 EABI, when the "compact" unwinding model is used, it does not have standard LSDA and _Unwind_GetLanguageSpecificData will not return data that is parseable by us. Check this conditon before calling _Unwind_GetLanguageSpecificData. Fix ARM32 build. Reviewed-on: https://go-review.googlesource.com/c/155758 From-SVN: r267428
2018-12-12runtime: handle DW_EH_PE_absptr in type table encodingIan Lance Taylor1-1/+1
The type table encoding can be DW_EH_PE_absptr, but this case was missing, which was causing abort on ARM32 EABI. Add the missing case. Reviewed-on: https://go-review.googlesource.com/c/153857 From-SVN: r267070
2018-12-12os/signal: increase deliver time for signal testcaseIan Lance Taylor1-1/+1
This increases the time to wait for signals to be delivered in the TestAtomicStop testcase. When running gccgo tests on ppc64 or ppc64le, there are intermittent failures in this test because the wait time is too small. Updates golang/go#29046 Reviewed-on: https://go-review.googlesource.com/c/153879 From-SVN: r267068
2018-12-11runtime: use _URC_FAILURE on ARM32Ian Lance Taylor1-1/+1
ARM32 EABI unwinder does not define _URC_NORMAL_STOP. Instead, it has _URC_FAILURE. Use _URC_FAILURE there. Should fix ARM32 build. Reviewed-on: https://go-review.googlesource.com/c/153417 From-SVN: r267033
2018-12-07runtime: add missing return for non-GNU/Linux version of tgkillIan Lance Taylor1-1/+1
Path from Rainer Orth. Reviewed-on: https://go-review.googlesource.com/c/153118 From-SVN: r266890
2018-12-05runtime: add precise stack scan supportIan Lance Taylor1-1/+1
This CL adds support of precise stack scan using stack maps to the runtime. The stack maps are generated by the compiler (if supported). Each safepoint is associated with a (real or dummy) landing pad, and its "type info" in the exception table is a pointer to the stack map. When a stack is scanned, the stack map is found by the stack unwinding code by inspecting the exception table (LSDA). For precise stack scan we need to unwind the stack. There are three cases: - If a goroutine is scanning its own stack, it can unwind the stack and scan the frames. - If a goroutine is scanning another, stopped, goroutine, it cannot directly unwind the target stack. We handle this by switching (runtime.gogo) to the target g, letting it unwind and scan the stack, and switch back. - If we are scanning a goroutine that is blocked in a syscall, we send a signal to the target goroutine's thread, and let the signal handler unwind and scan the stack. Extra care is needed as this races with enter/exit syscall. Currently this is only implemented on linux. Reviewed-on: https://go-review.googlesource.com/c/140518 From-SVN: r266832
2018-12-05syscall: remove Flock for aix/ppc64Ian Lance Taylor1-1/+1
CL 152397 removed it from gc's syscall package. Updates golang/go#29084 Reviewed-on: https://go-review.googlesource.com/c/152557 From-SVN: r266812
2018-12-04cmd/vet: use default compiler when determining type sizesIan Lance Taylor1-1/+1
Fixes a segfault running vet on alpha. Patch by Uros Bizjak. Reviewed-on: https://go-review.googlesource.com/c/152437 From-SVN: r266781
2018-12-03cmd/go: allow buildmode c-archive for gccgo on ppc64Ian Lance Taylor1-1/+1
In buildmodeinit, the c-archive buildmode is flagged as invalid on linux/ppc64 for gccgo when it should be valid. This happens because the check against the gccgo flag is done after the checks for valid GOOS/GOARCH pairs instead of before as is done for all other buildmode cases in this switch. This corrects the problem and allows several of the gccgo gotools testcases to pass on linux/ppc64. Updates #29046 Reviewed-on: https://go-review.googlesource.com/c/152137 From-SVN: r266764
2018-11-28compiler: inline functions with assignments and return statementsIan Lance Taylor5-7/+193
Support inlining functions that contain only assignments and return statements, with expressions of either constants or parameters. Functions that contain other kinds of statements or expressions are not yet inlined. With this change, about 100 functions in the standard library are inlinable. Reviewed-on: https://go-review.googlesource.com/c/150073 From-SVN: r266573
2018-11-27compiler: tweaks for importing inline function bodiesIan Lance Taylor3-4/+24
Track whether we've seen an error when importing a function; we will use error tracking to avoid knock-on errors. Stop importing identifiers at a ')'. Provide a way to adjust the indentation level while importing. Reviewed-on: https://go-review.googlesource.com/c/150072 From-SVN: r266536
2018-11-27compiler: record final type for numeric expressionsIan Lance Taylor5-2/+66
Inlinable function bodies are generated after the determine_types pass, so we know the type for all constants. Rather than try to determine it again when inlining, record the type in the export data, using a $convert expression. Reduce the number of explicit $convert expressions by recording a type context with the expected type in cases where that type is known. Reviewed-on: https://go-review.googlesource.com/c/150071 From-SVN: r266534
2018-11-27compiler: add result parameter names for inlinable functionsIan Lance Taylor3-17/+32
An inlinable function body may need to refer to result parameters, so each result parameter needs a name. We already give them all names in start_function (via create_result_variables). Change the export data so that for an inlinable function we use those names for the function declaration's result parameters. Reviewed-on: https://go-review.googlesource.com/c/150070 From-SVN: r266532
2018-11-27compiler: add types used by inline functions to export dataIan Lance Taylor2-3/+18
Reviewed-on: https://go-review.googlesource.com/c/150069 From-SVN: r266531
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