This commit was manufactured by cvs2svn to create branchsid-20020905-branchpoint sid-20020905-branch

'sid-20020905-branch'. Sprout from gdb_5_3-branch 2002-09-03 22:29:15 UTC nobody 'This commit was manufactured by cvs2svn to create branch 'gdb_5_3-branch'.' Cherrypick from master 2002-09-07 00:00:04 UTC Alan Modra <amodra@gmail.com> 'daily update': bfd/ChangeLog bfd/config.bfd bfd/version.h include/ChangeLog include/dis-asm.h libiberty/ChangeLog libiberty/regex.c opcodes/ChangeLog opcodes/disassemble.c opcodes/ppc-dis.c opcodes/ppc-opc.c Delete: djunpack.bat gdb/CONTRIBUTE gdb/COPYING gdb/ChangeLog gdb/ChangeLog-1990 gdb/ChangeLog-1991 gdb/ChangeLog-1992 gdb/ChangeLog-1993 gdb/ChangeLog-1994 gdb/ChangeLog-1995 gdb/ChangeLog-1996 gdb/ChangeLog-1997 gdb/ChangeLog-1998 gdb/ChangeLog-1999 gdb/ChangeLog-2000 gdb/ChangeLog-2001 gdb/ChangeLog-3.x gdb/MAINTAINERS gdb/Makefile.in gdb/NEWS gdb/PROBLEMS gdb/README gdb/TODO gdb/a68v-nat.c gdb/abug-rom.c gdb/acconfig.h gdb/acinclude.m4 gdb/aclocal.m4 gdb/ada-exp.y gdb/ada-lang.c gdb/ada-lang.h gdb/ada-lex.l gdb/ada-tasks.c gdb/ada-typeprint.c gdb/ada-valprint.c gdb/aix-thread.c gdb/alpha-linux-tdep.c gdb/alpha-nat.c gdb/alpha-osf1-tdep.c gdb/alpha-tdep.c gdb/alpha-tdep.h gdb/alphabsd-nat.c gdb/alphabsd-tdep.c gdb/alphabsd-tdep.h gdb/alphafbsd-tdep.c gdb/alphanbsd-tdep.c gdb/annotate.c gdb/annotate.h gdb/arc-tdep.c gdb/arch-utils.c gdb/arch-utils.h gdb/arm-linux-nat.c gdb/arm-linux-tdep.c gdb/arm-tdep.c gdb/arm-tdep.h gdb/armnbsd-nat.c gdb/armnbsd-tdep.c gdb/avr-tdep.c gdb/ax-gdb.c gdb/ax-gdb.h gdb/ax-general.c gdb/ax.h gdb/bcache.c gdb/bcache.h gdb/blockframe.c gdb/breakpoint.c gdb/breakpoint.h gdb/buildsym.c gdb/buildsym.h gdb/builtin-regs.c gdb/builtin-regs.h gdb/c-exp.y gdb/c-lang.c gdb/c-lang.h gdb/c-typeprint.c gdb/c-valprint.c gdb/call-cmds.h gdb/ch-exp.c gdb/ch-lang.c gdb/ch-lang.h gdb/ch-typeprint.c gdb/ch-valprint.c gdb/cli-out.c gdb/cli-out.h gdb/cli/cli-cmds.c gdb/cli/cli-cmds.h gdb/cli/cli-decode.c gdb/cli/cli-decode.h gdb/cli/cli-dump.c gdb/cli/cli-dump.h gdb/cli/cli-script.c gdb/cli/cli-script.h gdb/cli/cli-setshow.c gdb/cli/cli-setshow.h gdb/cli/cli-utils.c gdb/cli/cli-utils.h gdb/coff-solib.c gdb/coff-solib.h gdb/coffread.c gdb/command.h gdb/complaints.c gdb/complaints.h gdb/completer.c gdb/completer.h gdb/config.in gdb/config/alpha/alpha-linux.mh gdb/config/alpha/alpha-linux.mt gdb/config/alpha/alpha-osf1.mh gdb/config/alpha/alpha-osf1.mt gdb/config/alpha/alpha-osf2.mh gdb/config/alpha/alpha-osf3.mh gdb/config/alpha/alpha.mt gdb/config/alpha/fbsd.mh gdb/config/alpha/fbsd.mt gdb/config/alpha/nbsd.mh gdb/config/alpha/nbsd.mt gdb/config/alpha/nm-fbsd.h gdb/config/alpha/nm-linux.h gdb/config/alpha/nm-nbsd.h gdb/config/alpha/nm-osf.h gdb/config/alpha/nm-osf2.h gdb/config/alpha/nm-osf3.h gdb/config/alpha/tm-alpha.h gdb/config/alpha/tm-alphalinux.h gdb/config/alpha/tm-fbsd.h gdb/config/alpha/tm-nbsd.h gdb/config/alpha/xm-alphalinux.h gdb/config/alpha/xm-alphaosf.h gdb/config/arc/arc.mt gdb/config/arc/tm-arc.h gdb/config/arm/embed.mt gdb/config/arm/linux.mh gdb/config/arm/linux.mt gdb/config/arm/nbsd.mt gdb/config/arm/nbsdaout.mh gdb/config/arm/nbsdelf.mh gdb/config/arm/nm-linux.h gdb/config/arm/nm-nbsd.h gdb/config/arm/nm-nbsdaout.h gdb/config/arm/tm-arm.h gdb/config/arm/tm-embed.h gdb/config/arm/tm-linux.h gdb/config/arm/tm-wince.h gdb/config/arm/wince.mt gdb/config/arm/xm-linux.h gdb/config/arm/xm-nbsd.h gdb/config/avr/avr.mt gdb/config/cris/cris.mt gdb/config/cris/tm-cris.h gdb/config/d10v/d10v.mt gdb/config/d30v/d30v.mt gdb/config/d30v/tm-d30v.h gdb/config/djgpp/README gdb/config/djgpp/config.sed gdb/config/djgpp/djcheck.sh gdb/config/djgpp/djconfig.sh gdb/config/djgpp/fnchange.lst gdb/config/fr30/fr30.mt gdb/config/fr30/tm-fr30.h gdb/config/frv/frv.mt gdb/config/frv/tm-frv.h gdb/config/h8300/h8300.mt gdb/config/h8300/tm-h8300.h gdb/config/h8500/h8500.mt gdb/config/h8500/tm-h8500.h gdb/config/i386/cygwin.mh gdb/config/i386/cygwin.mt gdb/config/i386/embed.mt gdb/config/i386/fbsd.mh gdb/config/i386/fbsd.mt gdb/config/i386/gdbserve.mt gdb/config/i386/go32.mh gdb/config/i386/go32.mt gdb/config/i386/i386aix.mh gdb/config/i386/i386aix.mt gdb/config/i386/i386aout.mt gdb/config/i386/i386bsd.mh gdb/config/i386/i386bsd.mt gdb/config/i386/i386dgux.mh gdb/config/i386/i386gnu.mh gdb/config/i386/i386gnu.mt gdb/config/i386/i386lynx.mh gdb/config/i386/i386lynx.mt gdb/config/i386/i386m3.mh gdb/config/i386/i386m3.mt gdb/config/i386/i386mach.mh gdb/config/i386/i386mk.mh gdb/config/i386/i386mk.mt gdb/config/i386/i386nw.mt gdb/config/i386/i386os9k.mt gdb/config/i386/i386sco.mh gdb/config/i386/i386sco4.mh gdb/config/i386/i386sco5.mh gdb/config/i386/i386sco5.mt gdb/config/i386/i386sol2.mh gdb/config/i386/i386sol2.mt gdb/config/i386/i386v.mh gdb/config/i386/i386v.mt gdb/config/i386/i386v32.mh gdb/config/i386/i386v4.mh gdb/config/i386/i386v4.mt gdb/config/i386/i386v42mp.mh gdb/config/i386/i386v42mp.mt gdb/config/i386/linux.mh gdb/config/i386/linux.mt gdb/config/i386/nbsd.mt gdb/config/i386/nbsdaout.mh gdb/config/i386/nbsdelf.mh gdb/config/i386/ncr3000.mh gdb/config/i386/ncr3000.mt gdb/config/i386/nm-cygwin.h gdb/config/i386/nm-fbsd.h gdb/config/i386/nm-go32.h gdb/config/i386/nm-i386.h gdb/config/i386/nm-i386aix.h gdb/config/i386/nm-i386bsd.h gdb/config/i386/nm-i386gnu.h gdb/config/i386/nm-i386lynx.h gdb/config/i386/nm-i386mach.h gdb/config/i386/nm-i386sco.h gdb/config/i386/nm-i386sco4.h gdb/config/i386/nm-i386sco5.h gdb/config/i386/nm-i386sol2.h gdb/config/i386/nm-i386v.h gdb/config/i386/nm-i386v4.h gdb/config/i386/nm-i386v42mp.h gdb/config/i386/nm-linux.h gdb/config/i386/nm-m3.h gdb/config/i386/nm-nbsd.h gdb/config/i386/nm-nbsdaout.h gdb/config/i386/nm-obsd.h gdb/config/i386/nm-ptx4.h gdb/config/i386/nm-symmetry.h gdb/config/i386/nm-x86-64linux.h gdb/config/i386/obsd.mh gdb/config/i386/ptx.mh gdb/config/i386/ptx.mt gdb/config/i386/ptx4.mh gdb/config/i386/ptx4.mt gdb/config/i386/symmetry.mh gdb/config/i386/symmetry.mt gdb/config/i386/tm-cygwin.h gdb/config/i386/tm-fbsd.h gdb/config/i386/tm-go32.h gdb/config/i386/tm-i386.h gdb/config/i386/tm-i386aix.h gdb/config/i386/tm-i386bsd.h gdb/config/i386/tm-i386lynx.h gdb/config/i386/tm-i386m3.h gdb/config/i386/tm-i386mk.h gdb/config/i386/tm-i386os9k.h gdb/config/i386/tm-i386sol2.h gdb/config/i386/tm-i386v4.h gdb/config/i386/tm-i386v42mp.h gdb/config/i386/tm-linux.h gdb/config/i386/tm-nbsd.h gdb/config/i386/tm-ptx.h gdb/config/i386/tm-ptx4.h gdb/config/i386/tm-symmetry.h gdb/config/i386/tm-vxworks.h gdb/config/i386/tm-x86-64linux.h gdb/config/i386/vxworks.mt gdb/config/i386/x86-64linux.mh gdb/config/i386/x86-64linux.mt gdb/config/i386/xm-cygwin.h gdb/config/i386/xm-go32.h gdb/config/i386/xm-i386.h gdb/config/i386/xm-i386aix.h gdb/config/i386/xm-i386bsd.h gdb/config/i386/xm-i386m3.h gdb/config/i386/xm-i386mach.h gdb/config/i386/xm-i386mk.h gdb/config/i386/xm-i386sco.h gdb/config/i386/xm-i386v.h gdb/config/i386/xm-i386v32.h gdb/config/i386/xm-i386v4.h gdb/config/i386/xm-nbsd.h gdb/config/i386/xm-ptx.h gdb/config/i386/xm-ptx4.h gdb/config/i386/xm-symmetry.h gdb/config/i960/mon960.mt gdb/config/i960/nindy960.mt gdb/config/i960/tm-i960.h gdb/config/i960/tm-mon960.h gdb/config/i960/tm-nindy960.h gdb/config/i960/tm-vx960.h gdb/config/i960/vxworks960.mt gdb/config/ia64/aix.mh gdb/config/ia64/aix.mt gdb/config/ia64/ia64.mt gdb/config/ia64/linux.mh gdb/config/ia64/linux.mt gdb/config/ia64/nm-aix.h gdb/config/ia64/nm-linux.h gdb/config/ia64/tm-aix.h gdb/config/ia64/tm-ia64.h gdb/config/ia64/tm-linux.h gdb/config/ia64/xm-aix.h gdb/config/ia64/xm-linux.h gdb/config/m32r/m32r.mt gdb/config/m32r/tm-m32r.h gdb/config/m68hc11/m68hc11.mt gdb/config/m68k/3b1.mh gdb/config/m68k/3b1.mt gdb/config/m68k/apollo68b.mh gdb/config/m68k/apollo68b.mt gdb/config/m68k/apollo68v.mh gdb/config/m68k/cisco.mt gdb/config/m68k/delta68.mh gdb/config/m68k/delta68.mt gdb/config/m68k/dpx2.mh gdb/config/m68k/dpx2.mt gdb/config/m68k/es1800.mt gdb/config/m68k/hp300bsd.mh gdb/config/m68k/hp300bsd.mt gdb/config/m68k/hp300hpux.mh gdb/config/m68k/hp300hpux.mt gdb/config/m68k/linux.mh gdb/config/m68k/linux.mt gdb/config/m68k/m68klynx.mh gdb/config/m68k/m68klynx.mt gdb/config/m68k/m68kv4.mh gdb/config/m68k/m68kv4.mt gdb/config/m68k/monitor.mt gdb/config/m68k/nbsdaout.mh gdb/config/m68k/nbsdaout.mt gdb/config/m68k/nm-apollo68b.h gdb/config/m68k/nm-apollo68v.h gdb/config/m68k/nm-delta68.h gdb/config/m68k/nm-dpx2.h gdb/config/m68k/nm-hp300bsd.h gdb/config/m68k/nm-hp300hpux.h gdb/config/m68k/nm-linux.h gdb/config/m68k/nm-m68klynx.h gdb/config/m68k/nm-nbsd.h gdb/config/m68k/nm-nbsdaout.h gdb/config/m68k/nm-sun2.h gdb/config/m68k/nm-sun3.h gdb/config/m68k/nm-sysv4.h gdb/config/m68k/os68k.mt gdb/config/m68k/st2000.mt gdb/config/m68k/sun2os3.mh gdb/config/m68k/sun2os3.mt gdb/config/m68k/sun2os4.mh gdb/config/m68k/sun2os4.mt gdb/config/m68k/sun3os3.mh gdb/config/m68k/sun3os3.mt gdb/config/m68k/sun3os4.mh gdb/config/m68k/sun3os4.mt gdb/config/m68k/tm-3b1.h gdb/config/m68k/tm-apollo68b.h gdb/config/m68k/tm-cisco.h gdb/config/m68k/tm-delta68.h gdb/config/m68k/tm-dpx2.h gdb/config/m68k/tm-es1800.h gdb/config/m68k/tm-hp300bsd.h gdb/config/m68k/tm-hp300hpux.h gdb/config/m68k/tm-linux.h gdb/config/m68k/tm-m68k.h gdb/config/m68k/tm-m68klynx.h gdb/config/m68k/tm-m68kv4.h gdb/config/m68k/tm-mac.h gdb/config/m68k/tm-monitor.h gdb/config/m68k/tm-nbsd.h gdb/config/m68k/tm-os68k.h gdb/config/m68k/tm-st2000.h gdb/config/m68k/tm-sun2.h gdb/config/m68k/tm-sun2os4.h gdb/config/m68k/tm-sun3.h gdb/config/m68k/tm-sun3os4.h gdb/config/m68k/tm-vx68.h gdb/config/m68k/vxworks68.mt gdb/config/m68k/xm-3b1.h gdb/config/m68k/xm-apollo68b.h gdb/config/m68k/xm-apollo68v.h gdb/config/m68k/xm-delta68.h gdb/config/m68k/xm-dpx2.h gdb/config/m68k/xm-hp300bsd.h gdb/config/m68k/xm-hp300hpux.h gdb/config/m68k/xm-linux.h gdb/config/m68k/xm-m68k.h gdb/config/m68k/xm-m68kv4.h gdb/config/m68k/xm-nbsd.h gdb/config/m68k/xm-sun2.h gdb/config/m68k/xm-sun3.h gdb/config/m68k/xm-sun3os4.h gdb/config/m88k/delta88.mh gdb/config/m88k/delta88.mt gdb/config/m88k/delta88v4.mh gdb/config/m88k/delta88v4.mt gdb/config/m88k/m88k.mh gdb/config/m88k/m88k.mt gdb/config/m88k/nm-delta88v4.h gdb/config/m88k/nm-m88k.h gdb/config/m88k/tm-delta88.h gdb/config/m88k/tm-delta88v4.h gdb/config/m88k/tm-m88k.h gdb/config/m88k/xm-delta88.h gdb/config/m88k/xm-delta88v4.h gdb/config/m88k/xm-dgux.h gdb/config/mcore/mcore.mt gdb/config/mips/bigmips.mt gdb/config/mips/bigmips64.mt gdb/config/mips/decstation.mh gdb/config/mips/decstation.mt gdb/config/mips/embed.mt gdb/config/mips/embed64.mt gdb/config/mips/embedl.mt gdb/config/mips/embedl64.mt gdb/config/mips/irix3.mh gdb/config/mips/irix3.mt gdb/config/mips/irix4.mh gdb/config/mips/irix5.mh gdb/config/mips/irix5.mt gdb/config/mips/irix6.mh gdb/config/mips/irix6.mt gdb/config/mips/linux.mh gdb/config/mips/linux.mt gdb/config/mips/littlemips.mh gdb/config/mips/littlemips.mt gdb/config/mips/mipsm3.mh gdb/config/mips/mipsm3.mt gdb/config/mips/mipsv4.mh gdb/config/mips/mipsv4.mt gdb/config/mips/nbsd.mh gdb/config/mips/nbsd.mt gdb/config/mips/news-mips.mh gdb/config/mips/nm-irix3.h gdb/config/mips/nm-irix4.h gdb/config/mips/nm-irix5.h gdb/config/mips/nm-irix6.h gdb/config/mips/nm-linux.h gdb/config/mips/nm-mips.h gdb/config/mips/nm-nbsd.h gdb/config/mips/nm-news-mips.h gdb/config/mips/nm-riscos.h gdb/config/mips/riscos.mh gdb/config/mips/tm-bigmips.h gdb/config/mips/tm-bigmips64.h gdb/config/mips/tm-embed.h gdb/config/mips/tm-embed64.h gdb/config/mips/tm-embedl.h gdb/config/mips/tm-embedl64.h gdb/config/mips/tm-irix3.h gdb/config/mips/tm-irix5.h gdb/config/mips/tm-irix6.h gdb/config/mips/tm-linux.h gdb/config/mips/tm-mips.h gdb/config/mips/tm-mips64.h gdb/config/mips/tm-mipsm3.h gdb/config/mips/tm-mipsv4.h gdb/config/mips/tm-nbsd.h gdb/config/mips/tm-tx39.h gdb/config/mips/tm-tx39l.h gdb/config/mips/tm-vr4100.h gdb/config/mips/tm-vr4300.h gdb/config/mips/tm-vr4300el.h gdb/config/mips/tm-vr4xxx.h gdb/config/mips/tm-vr4xxxel.h gdb/config/mips/tm-vr5000.h gdb/config/mips/tm-vr5000el.h gdb/config/mips/tm-vxmips.h gdb/config/mips/tm-wince.h gdb/config/mips/tx39.mt gdb/config/mips/tx39l.mt gdb/config/mips/vr4100.mt gdb/config/mips/vr4300.mt gdb/config/mips/vr4300el.mt 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readline/config.h.bot readline/config.h.in readline/configure readline/configure.in readline/cross-build/cygwin.cache readline/display.c readline/doc/ChangeLog.gdb readline/doc/Makefile.in readline/doc/hist.texinfo readline/doc/hstech.texinfo readline/doc/hsuser.texinfo readline/doc/inc-hist.texinfo readline/doc/manvers.texinfo readline/doc/readline.3 readline/doc/rlman.texinfo readline/doc/rltech.texinfo readline/doc/rluser.texinfo readline/doc/rluserman.texinfo readline/doc/texi2dvi readline/doc/texi2html readline/emacs_keymap.c readline/examples/ChangeLog.gdb readline/examples/Inputrc readline/examples/Makefile.in readline/examples/excallback.c readline/examples/fileman.c readline/examples/histexamp.c readline/examples/manexamp.c readline/examples/rl.c readline/examples/rlfe.c readline/examples/rltest.c readline/examples/rlversion.c readline/funmap.c readline/histexpand.c readline/histfile.c readline/histlib.h readline/history.c readline/history.h readline/histsearch.c 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sim/testsuite/sim/m32r/uread16.ms sim/testsuite/sim/m32r/uread32.ms sim/testsuite/sim/m32r/uwrite16.ms sim/testsuite/sim/m32r/uwrite32.ms sim/testsuite/sim/m32r/xor.cgs sim/testsuite/sim/m32r/xor3.cgs sim/v850/ChangeLog sim/v850/Makefile.in sim/v850/acconfig.h sim/v850/config.in sim/v850/configure sim/v850/configure.in sim/v850/interp.c sim/v850/sim-main.h sim/v850/simops.c sim/v850/simops.h sim/v850/v850-dc sim/v850/v850.igen sim/v850/v850_sim.h sim/z8k/ChangeLog sim/z8k/Makefile.in sim/z8k/acconfig.h sim/z8k/comped1.c sim/z8k/comped2.c sim/z8k/comped3.c sim/z8k/compedb3.c sim/z8k/config.in sim/z8k/configure sim/z8k/configure.in sim/z8k/iface.c sim/z8k/inlines.h sim/z8k/mem.c sim/z8k/mem.h sim/z8k/quick.c sim/z8k/sim.h sim/z8k/support.c sim/z8k/syscall.h sim/z8k/tconfig.in sim/z8k/tm.h sim/z8k/writecode.c texinfo/texinfo.tex
author: nobody <> 2002-09-07 00:00:05 +0000
committer: nobody <> 2002-09-07 00:00:05 +0000
commit: c1aa2a27e755c883b5c49b223120dfb712ea4e28 (patch)
tree: a98633075cd1f2b034b49446e83e522708d11f68 /gdb/doc/agentexpr.texi
parent: 2e3c0e2427295c9cc09a8a707dfba38d50e2ba30 (diff)
download: binutils-sid-20020905-branch.zip
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-\input texinfo
-@c %**start of header
-@setfilename agentexpr.info
-@settitle GDB Agent Expressions
-@setchapternewpage off
-@c %**end of header
-
-Revision: $Id$
-
-@node The GDB Agent Expression Mechanism
-@chapter The GDB Agent Expression Mechanism
-
-In some applications, it is not feasable for the debugger to interrupt
-the program's execution long enough for the developer to learn anything
-helpful about its behavior.  If the program's correctness depends on its
-real-time behavior, delays introduced by a debugger might cause the
-program to fail, even when the code itself is correct.  It is useful to
-be able to observe the program's behavior without interrupting it.
-
-Using GDB's @code{trace} and @code{collect} commands, the user can
-specify locations in the program, and arbitrary expressions to evaluate
-when those locations are reached.  Later, using the @code{tfind}
-command, she can examine the values those expressions had when the
-program hit the trace points.  The expressions may also denote objects
-in memory --- structures or arrays, for example --- whose values GDB
-should record; while visiting a particular tracepoint, the user may
-inspect those objects as if they were in memory at that moment.
-However, because GDB records these values without interacting with the
-user, it can do so quickly and unobtrusively, hopefully not disturbing
-the program's behavior.
-
-When GDB is debugging a remote target, the GDB @dfn{agent} code running
-on the target computes the values of the expressions itself.  To avoid
-having a full symbolic expression evaluator on the agent, GDB translates
-expressions in the source language into a simpler bytecode language, and
-then sends the bytecode to the agent; the agent then executes the
-bytecode, and records the values for GDB to retrieve later.
-
-The bytecode language is simple; there are forty-odd opcodes, the bulk
-of which are the usual vocabulary of C operands (addition, subtraction,
-shifts, and so on) and various sizes of literals and memory reference
-operations.  The bytecode interpreter operates strictly on machine-level
-values --- various sizes of integers and floating point numbers --- and
-requires no information about types or symbols; thus, the interpreter's
-internal data structures are simple, and each bytecode requires only a
-few native machine instructions to implement it.  The interpreter is
-small, and strict limits on the memory and time required to evaluate an
-expression are easy to determine, making it suitable for use by the
-debugging agent in real-time applications.
-
-@menu
-* General Bytecode Design::     Overview of the interpreter.
-* Bytecode Descriptions::       What each one does.
-* Using Agent Expressions::     How agent expressions fit into the big picture.
-* Varying Target Capabilities:: How to discover what the target can do.
-* Tracing on Symmetrix::        Special info for implementation on EMC's
-                                boxes.
-* Rationale::                   Why we did it this way.
-@end menu
-
-
-@c @node Rationale
-@c @section Rationale
-
-
-@node General Bytecode Design
-@section General Bytecode Design
-
-The agent represents bytecode expressions as an array of bytes.  Each
-instruction is one byte long (thus the term @dfn{bytecode}).  Some
-instructions are followed by operand bytes; for example, the @code{goto}
-instruction is followed by a destination for the jump.
-
-The bytecode interpreter is a stack-based machine; most instructions pop
-their operands off the stack, perform some operation, and push the
-result back on the stack for the next instruction to consume.  Each
-element of the stack may contain either a integer or a floating point
-value; these values are as many bits wide as the largest integer that
-can be directly manipulated in the source language.  Stack elements
-carry no record of their type; bytecode could push a value as an
-integer, then pop it as a floating point value.  However, GDB will not
-generate code which does this.  In C, one might define the type of a
-stack element as follows:
-@example
-union agent_val @{
-  LONGEST l;
-  DOUBLEST d;
-@};
-@end example
-@noindent
-where @code{LONGEST} and @code{DOUBLEST} are @code{typedef} names for
-the largest integer and floating point types on the machine.
-
-By the time the bytecode interpreter reaches the end of the expression,
-the value of the expression should be the only value left on the stack.
-For tracing applications, @code{trace} bytecodes in the expression will
-have recorded the necessary data, and the value on the stack may be
-discarded.  For other applications, like conditional breakpoints, the
-value may be useful.
-
-Separate from the stack, the interpreter has two registers:
-@table @code
-@item pc
-The address of the next bytecode to execute.
-
-@item start
-The address of the start of the bytecode expression, necessary for
-interpreting the @code{goto} and @code{if_goto} instructions.
-
-@end table
-@noindent
-Neither of these registers is directly visible to the bytecode language
-itself, but they are useful for defining the meanings of the bytecode
-operations.
-
-There are no instructions to perform side effects on the running
-program, or call the program's functions; we assume that these
-expressions are only used for unobtrusive debugging, not for patching
-the running code.  
-
-Most bytecode instructions do not distinguish between the various sizes
-of values, and operate on full-width values; the upper bits of the
-values are simply ignored, since they do not usually make a difference
-to the value computed.  The exceptions to this rule are:
-@table @asis
-
-@item memory reference instructions (@code{ref}@var{n})
-There are distinct instructions to fetch different word sizes from
-memory.  Once on the stack, however, the values are treated as full-size
-integers.  They may need to be sign-extended; the @code{ext} instruction
-exists for this purpose.
-
-@item the sign-extension instruction (@code{ext} @var{n})
-These clearly need to know which portion of their operand is to be
-extended to occupy the full length of the word.
-
-@end table
-
-If the interpreter is unable to evaluate an expression completely for
-some reason (a memory location is inaccessible, or a divisor is zero,
-for example), we say that interpretation ``terminates with an error''.
-This means that the problem is reported back to the interpreter's caller
-in some helpful way.  In general, code using agent expressions should
-assume that they may attempt to divide by zero, fetch arbitrary memory
-locations, and misbehave in other ways.
-
-Even complicated C expressions compile to a few bytecode instructions;
-for example, the expression @code{x + y * z} would typically produce
-code like the following, assuming that @code{x} and @code{y} live in
-registers, and @code{z} is a global variable holding a 32-bit
-@code{int}:
-@example
-reg 1
-reg 2
-const32 @i{address of z}
-ref32
-ext 32
-mul
-add
-end
-@end example
-
-In detail, these mean:
-@table @code
-
-@item reg 1
-Push the value of register 1 (presumably holding @code{x}) onto the
-stack.
-
-@item reg 2
-Push the value of register 2 (holding @code{y}).
-
-@item const32 @i{address of z}
-Push the address of @code{z} onto the stack.
-
-@item ref32
-Fetch a 32-bit word from the address at the top of the stack; replace
-the address on the stack with the value.  Thus, we replace the address
-of @code{z} with @code{z}'s value.
-
-@item ext 32
-Sign-extend the value on the top of the stack from 32 bits to full
-length.  This is necessary because @code{z} is a signed integer.
-
-@item mul
-Pop the top two numbers on the stack, multiply them, and push their
-product.  Now the top of the stack contains the value of the expression
-@code{y * z}.
-
-@item add
-Pop the top two numbers, add them, and push the sum.  Now the top of the
-stack contains the value of @code{x + y * z}.
-
-@item end
-Stop executing; the value left on the stack top is the value to be
-recorded.
-
-@end table
-
-
-@node Bytecode Descriptions
-@section Bytecode Descriptions
-
-Each bytecode description has the following form:
-
-@table @asis
-
-@item @code{add} (0x02): @var{a} @var{b} @result{} @var{a+b}
-
-Pop the top two stack items, @var{a} and @var{b}, as integers; push
-their sum, as an integer.
-
-@end table
-
-In this example, @code{add} is the name of the bytecode, and
-@code{(0x02)} is the one-byte value used to encode the bytecode, in
-hexidecimal.  The phrase ``@var{a} @var{b} @result{} @var{a+b}'' shows
-the stack before and after the bytecode executes.  Beforehand, the stack
-must contain at least two values, @var{a} and @var{b}; since the top of
-the stack is to the right, @var{b} is on the top of the stack, and
-@var{a} is underneath it.  After execution, the bytecode will have
-popped @var{a} and @var{b} from the stack, and replaced them with a
-single value, @var{a+b}.  There may be other values on the stack below
-those shown, but the bytecode affects only those shown.
-
-Here is another example:
-
-@table @asis
-
-@item @code{const8} (0x22) @var{n}: @result{} @var{n}
-Push the 8-bit integer constant @var{n} on the stack, without sign
-extension.
-
-@end table
-
-In this example, the bytecode @code{const8} takes an operand @var{n}
-directly from the bytecode stream; the operand follows the @code{const8}
-bytecode itself.  We write any such operands immediately after the name
-of the bytecode, before the colon, and describe the exact encoding of
-the operand in the bytecode stream in the body of the bytecode
-description.
-
-For the @code{const8} bytecode, there are no stack items given before
-the @result{}; this simply means that the bytecode consumes no values
-from the stack.  If a bytecode consumes no values, or produces no
-values, the list on either side of the @result{} may be empty.
-
-If a value is written as @var{a}, @var{b}, or @var{n}, then the bytecode
-treats it as an integer.  If a value is written is @var{addr}, then the
-bytecode treats it as an address.
-
-We do not fully describe the floating point operations here; although
-this design can be extended in a clean way to handle floating point
-values, they are not of immediate interest to the customer, so we avoid
-describing them, to save time.
-
-
-@table @asis
-
-@item @code{float} (0x01): @result{}
-
-Prefix for floating-point bytecodes.  Not implemented yet.
-
-@item @code{add} (0x02): @var{a} @var{b} @result{} @var{a+b}
-Pop two integers from the stack, and push their sum, as an integer.
-
-@item @code{sub} (0x03): @var{a} @var{b} @result{} @var{a-b}
-Pop two integers from the stack, subtract the top value from the
-next-to-top value, and push the difference.
-
-@item @code{mul} (0x04): @var{a} @var{b} @result{} @var{a*b}
-Pop two integers from the stack, multiply them, and push the product on
-the stack.  Note that, when one multiplies two @var{n}-bit numbers
-yielding another @var{n}-bit number, it is irrelevant whether the
-numbers are signed or not; the results are the same.
-
-@item @code{div_signed} (0x05): @var{a} @var{b} @result{} @var{a/b}
-Pop two signed integers from the stack; divide the next-to-top value by
-the top value, and push the quotient.  If the divisor is zero, terminate
-with an error.
-
-@item @code{div_unsigned} (0x06): @var{a} @var{b} @result{} @var{a/b}
-Pop two unsigned integers from the stack; divide the next-to-top value
-by the top value, and push the quotient.  If the divisor is zero,
-terminate with an error.
-
-@item @code{rem_signed} (0x07): @var{a} @var{b} @result{} @var{a modulo b}
-Pop two signed integers from the stack; divide the next-to-top value by
-the top value, and push the remainder.  If the divisor is zero,
-terminate with an error.
-
-@item @code{rem_unsigned} (0x08): @var{a} @var{b} @result{} @var{a modulo b}
-Pop two unsigned integers from the stack; divide the next-to-top value
-by the top value, and push the remainder.  If the divisor is zero,
-terminate with an error.
-
-@item @code{lsh} (0x09): @var{a} @var{b} @result{} @var{a<<b}
-Pop two integers from the stack; let @var{a} be the next-to-top value,
-and @var{b} be the top value.  Shift @var{a} left by @var{b} bits, and
-push the result.
-
-@item @code{rsh_signed} (0x0a): @var{a} @var{b} @result{} @var{@code{(signed)}a>>b}
-Pop two integers from the stack; let @var{a} be the next-to-top value,
-and @var{b} be the top value.  Shift @var{a} right by @var{b} bits,
-inserting copies of the top bit at the high end, and push the result.
-
-@item @code{rsh_unsigned} (0x0b): @var{a} @var{b} @result{} @var{a>>b}
-Pop two integers from the stack; let @var{a} be the next-to-top value,
-and @var{b} be the top value.  Shift @var{a} right by @var{b} bits,
-inserting zero bits at the high end, and push the result.
-
-@item @code{log_not} (0x0e): @var{a} @result{} @var{!a}
-Pop an integer from the stack; if it is zero, push the value one;
-otherwise, push the value zero.
-
-@item @code{bit_and} (0x0f): @var{a} @var{b} @result{} @var{a&b}
-Pop two integers from the stack, and push their bitwise @code{and}.
-
-@item @code{bit_or} (0x10): @var{a} @var{b} @result{} @var{a|b}
-Pop two integers from the stack, and push their bitwise @code{or}.
-
-@item @code{bit_xor} (0x11): @var{a} @var{b} @result{} @var{a^b}
-Pop two integers from the stack, and push their bitwise
-exclusive-@code{or}.
-
-@item @code{bit_not} (0x12): @var{a} @result{} @var{~a}
-Pop an integer from the stack, and push its bitwise complement.
-
-@item @code{equal} (0x13): @var{a} @var{b} @result{} @var{a=b}
-Pop two integers from the stack; if they are equal, push the value one;
-otherwise, push the value zero.
-
-@item @code{less_signed} (0x14): @var{a} @var{b} @result{} @var{a<b}
-Pop two signed integers from the stack; if the next-to-top value is less
-than the top value, push the value one; otherwise, push the value zero.
-
-@item @code{less_unsigned} (0x15): @var{a} @var{b} @result{} @var{a<b}
-Pop two unsigned integers from the stack; if the next-to-top value is less
-than the top value, push the value one; otherwise, push the value zero.
-
-@item @code{ext} (0x16) @var{n}: @var{a} @result{} @var{a}, sign-extended from @var{n} bits
-Pop an unsigned value from the stack; treating it as an @var{n}-bit
-twos-complement value, extend it to full length.  This means that all
-bits to the left of bit @var{n-1} (where the least significant bit is bit
-0) are set to the value of bit @var{n-1}.  Note that @var{n} may be
-larger than or equal to the width of the stack elements of the bytecode
-engine; in this case, the bytecode should have no effect.
-
-The number of source bits to preserve, @var{n}, is encoded as a single
-byte unsigned integer following the @code{ext} bytecode.
-
-@item @code{zero_ext} (0x2a) @var{n}: @var{a} @result{} @var{a}, zero-extended from @var{n} bits
-Pop an unsigned value from the stack; zero all but the bottom @var{n}
-bits.  This means that all bits to the left of bit @var{n-1} (where the
-least significant bit is bit 0) are set to the value of bit @var{n-1}.
-
-The number of source bits to preserve, @var{n}, is encoded as a single
-byte unsigned integer following the @code{zero_ext} bytecode.
-
-@item @code{ref8} (0x17): @var{addr} @result{} @var{a}
-@itemx @code{ref16} (0x18): @var{addr} @result{} @var{a}
-@itemx @code{ref32} (0x19): @var{addr} @result{} @var{a}
-@itemx @code{ref64} (0x1a): @var{addr} @result{} @var{a}
-Pop an address @var{addr} from the stack.  For bytecode
-@code{ref}@var{n}, fetch an @var{n}-bit value from @var{addr}, using the
-natural target endianness.  Push the fetched value as an unsigned
-integer.
-
-Note that @var{addr} may not be aligned in any particular way; the
-@code{ref@var{n}} bytecodes should operate correctly for any address.
-
-If attempting to access memory at @var{addr} would cause a processor
-exception of some sort, terminate with an error.
-
-@item @code{ref_float} (0x1b): @var{addr} @result{} @var{d}
-@itemx @code{ref_double} (0x1c): @var{addr} @result{} @var{d}
-@itemx @code{ref_long_double} (0x1d): @var{addr} @result{} @var{d}
-@itemx @code{l_to_d} (0x1e): @var{a} @result{} @var{d}
-@itemx @code{d_to_l} (0x1f): @var{d} @result{} @var{a}
-Not implemented yet.
-
-@item @code{dup} (0x28): @var{a} => @var{a} @var{a}
-Push another copy of the stack's top element.
-
-@item @code{swap} (0x2b): @var{a} @var{b} => @var{b} @var{a}
-Exchange the top two items on the stack.
-
-@item @code{pop} (0x29): @var{a} =>
-Discard the top value on the stack.
-
-@item @code{if_goto} (0x20) @var{offset}: @var{a} @result{}
-Pop an integer off the stack; if it is non-zero, branch to the given
-offset in the bytecode string.  Otherwise, continue to the next
-instruction in the bytecode stream.  In other words, if @var{a} is
-non-zero, set the @code{pc} register to @code{start} + @var{offset}.
-Thus, an offset of zero denotes the beginning of the expression.
-
-The @var{offset} is stored as a sixteen-bit unsigned value, stored
-immediately following the @code{if_goto} bytecode.  It is always stored
-most signficant byte first, regardless of the target's normal
-endianness.  The offset is not guaranteed to fall at any particular
-alignment within the bytecode stream; thus, on machines where fetching a
-16-bit on an unaligned address raises an exception, you should fetch the
-offset one byte at a time.
-
-@item @code{goto} (0x21) @var{offset}: @result{}
-Branch unconditionally to @var{offset}; in other words, set the
-@code{pc} register to @code{start} + @var{offset}.
-
-The offset is stored in the same way as for the @code{if_goto} bytecode.
-
-@item @code{const8} (0x22) @var{n}: @result{} @var{n}
-@itemx @code{const16} (0x23) @var{n}: @result{} @var{n}
-@itemx @code{const32} (0x24) @var{n}: @result{} @var{n}
-@itemx @code{const64} (0x25) @var{n}: @result{} @var{n}
-Push the integer constant @var{n} on the stack, without sign extension.
-To produce a small negative value, push a small twos-complement value,
-and then sign-extend it using the @code{ext} bytecode.
-
-The constant @var{n} is stored in the appropriate number of bytes
-following the @code{const}@var{b} bytecode.  The constant @var{n} is
-always stored most significant byte first, regardless of the target's
-normal endianness.  The constant is not guaranteed to fall at any
-particular alignment within the bytecode stream; thus, on machines where
-fetching a 16-bit on an unaligned address raises an exception, you
-should fetch @var{n} one byte at a time.
-
-@item @code{reg} (0x26) @var{n}: @result{} @var{a}
-Push the value of register number @var{n}, without sign extension.  The
-registers are numbered following GDB's conventions.
-
-The register number @var{n} is encoded as a 16-bit unsigned integer
-immediately following the @code{reg} bytecode.  It is always stored most
-signficant byte first, regardless of the target's normal endianness.
-The register number is not guaranteed to fall at any particular
-alignment within the bytecode stream; thus, on machines where fetching a
-16-bit on an unaligned address raises an exception, you should fetch the
-register number one byte at a time.
-
-@item @code{trace} (0x0c): @var{addr} @var{size} @result{}
-Record the contents of the @var{size} bytes at @var{addr} in a trace
-buffer, for later retrieval by GDB.
-
-@item @code{trace_quick} (0x0d) @var{size}: @var{addr} @result{} @var{addr}
-Record the contents of the @var{size} bytes at @var{addr} in a trace
-buffer, for later retrieval by GDB.  @var{size} is a single byte
-unsigned integer following the @code{trace} opcode.
-
-This bytecode is equivalent to the sequence @code{dup const8 @var{size}
-trace}, but we provide it anyway to save space in bytecode strings.
-
-@item @code{trace16} (0x30) @var{size}: @var{addr} @result{} @var{addr}
-Identical to trace_quick, except that @var{size} is a 16-bit big-endian
-unsigned integer, not a single byte.  This should probably have been
-named @code{trace_quick16}, for consistency.
-
-@item @code{end} (0x27): @result{}
-Stop executing bytecode; the result should be the top element of the
-stack.  If the purpose of the expression was to compute an lvalue or a
-range of memory, then the next-to-top of the stack is the lvalue's
-address, and the top of the stack is the lvalue's size, in bytes.
-
-@end table
-
-
-@node Using Agent Expressions
-@section Using Agent Expressions
-
-Here is a sketch of a full non-stop debugging cycle, showing how agent
-expressions fit into the process.
-
-@itemize @bullet
-
-@item
-The user selects trace points in the program's code at which GDB should
-collect data.
-
-@item
-The user specifies expressions to evaluate at each trace point.  These
-expressions may denote objects in memory, in which case those objects'
-contents are recorded as the program runs, or computed values, in which
-case the values themselves are recorded.
-
-@item
-GDB transmits the tracepoints and their associated expressions to the
-GDB agent, running on the debugging target.
-
-@item
-The agent arranges to be notified when a trace point is hit.  Note that,
-on some systems, the target operating system is completely responsible
-for collecting the data; see @ref{Tracing on Symmetrix}.
-
-@item
-When execution on the target reaches a trace point, the agent evaluates
-the expressions associated with that trace point, and records the
-resulting values and memory ranges.
-
-@item
-Later, when the user selects a given trace event and inspects the
-objects and expression values recorded, GDB talks to the agent to
-retrieve recorded data as necessary to meet the user's requests.  If the
-user asks to see an object whose contents have not been recorded, GDB
-reports an error.
-
-@end itemize
-
-
-@node Varying Target Capabilities
-@section Varying Target Capabilities
-
-Some targets don't support floating-point, and some would rather not
-have to deal with @code{long long} operations.  Also, different targets
-will have different stack sizes, and different bytecode buffer lengths.
-
-Thus, GDB needs a way to ask the target about itself.  We haven't worked
-out the details yet, but in general, GDB should be able to send the
-target a packet asking it to describe itself.  The reply should be a
-packet whose length is explicit, so we can add new information to the
-packet in future revisions of the agent, without confusing old versions
-of GDB, and it should contain a version number.  It should contain at
-least the following information:
-
-@itemize @bullet
-
-@item
-whether floating point is supported
-
-@item
-whether @code{long long} is supported
-
-@item
-maximum acceptable size of bytecode stack
-
-@item
-maximum acceptable length of bytecode expressions
-
-@item
-which registers are actually available for collection
-
-@item
-whether the target supports disabled tracepoints
-
-@end itemize
-
-
-
-@node Tracing on Symmetrix
-@section Tracing on Symmetrix
-
-This section documents the API used by the GDB agent to collect data on
-Symmetrix systems.
-
-Cygnus originally implemented these tracing features to help EMC
-Corporation debug their Symmetrix high-availability disk drives.  The
-Symmetrix application code already includes substantial tracing
-facilities; the GDB agent for the Symmetrix system uses those facilities
-for its own data collection, via the API described here.
-
-@deftypefn Function DTC_RESPONSE adbg_find_memory_in_frame (FRAME_DEF *@var{frame}, char *@var{address}, char **@var{buffer}, unsigned int *@var{size})
-Search the trace frame @var{frame} for memory saved from @var{address}.
-If the memory is available, provide the address of the buffer holding
-it; otherwise, provide the address of the next saved area.
-
-@itemize @bullet
-
-@item
-If the memory at @var{address} was saved in @var{frame}, set
-@code{*@var{buffer}} to point to the buffer in which that memory was
-saved, set @code{*@var{size}} to the number of bytes from @var{address}
-that are saved at @code{*@var{buffer}}, and return
-@code{OK_TARGET_RESPONSE}.  (Clearly, in this case, the function will
-always set @code{*@var{size}} to a value greater than zero.)
-
-@item
-If @var{frame} does not record any memory at @var{address}, set
-@code{*@var{size}} to the distance from @var{address} to the start of
-the saved region with the lowest address higher than @var{address}.  If
-there is no memory saved from any higher address, set @code{*@var{size}}
-to zero.  Return @code{NOT_FOUND_TARGET_RESPONSE}.
-@end itemize
-
-These two possibilities allow the caller to either retrieve the data, or
-walk the address space to the next saved area.
-@end deftypefn
-
-This function allows the GDB agent to map the regions of memory saved in
-a particular frame, and retrieve their contents efficiently.
-
-This function also provides a clean interface between the GDB agent and
-the Symmetrix tracing structures, making it easier to adapt the GDB
-agent to future versions of the Symmetrix system, and vice versa.  This
-function searches all data saved in @var{frame}, whether the data is
-there at the request of a bytecode expression, or because it falls in
-one of the format's memory ranges, or because it was saved from the top
-of the stack.  EMC can arbitrarily change and enhance the tracing
-mechanism, but as long as this function works properly, all collected
-memory is visible to GDB.
-
-The function itself is straightforward to implement.  A single pass over
-the trace frame's stack area, memory ranges, and expression blocks can
-yield the address of the buffer (if the requested address was saved),
-and also note the address of the next higher range of memory, to be
-returned when the search fails.
-
-As an example, suppose the trace frame @code{f} has saved sixteen bytes
-from address @code{0x8000} in a buffer at @code{0x1000}, and thirty-two
-bytes from address @code{0xc000} in a buffer at @code{0x1010}.  Here are
-some sample calls, and the effect each would have:
-
-@table @code
-
-@item adbg_find_memory_in_frame (f, (char*) 0x8000, &buffer, &size)
-This would set @code{buffer} to @code{0x1000}, set @code{size} to
-sixteen, and return @code{OK_TARGET_RESPONSE}, since @code{f} saves
-sixteen bytes from @code{0x8000} at @code{0x1000}.
-
-@item adbg_find_memory_in_frame (f, (char *) 0x8004, &buffer, &size)
-This would set @code{buffer} to @code{0x1004}, set @code{size} to
-twelve, and return @code{OK_TARGET_RESPONSE}, since @file{f} saves the
-twelve bytes from @code{0x8004} starting four bytes into the buffer at
-@code{0x1000}.  This shows that request addresses may fall in the middle
-of saved areas; the function should return the address and size of the
-remainder of the buffer.
-
-@item adbg_find_memory_in_frame (f, (char *) 0x8100, &buffer, &size)
-This would set @code{size} to @code{0x3f00} and return
-@code{NOT_FOUND_TARGET_RESPONSE}, since there is no memory saved in
-@code{f} from the address @code{0x8100}, and the next memory available
-is at @code{0x8100 + 0x3f00}, or @code{0xc000}.  This shows that request
-addresses may fall outside of all saved memory ranges; the function
-should indicate the next saved area, if any.
-
-@item adbg_find_memory_in_frame (f, (char *) 0x7000, &buffer, &size)
-This would set @code{size} to @code{0x1000} and return
-@code{NOT_FOUND_TARGET_RESPONSE}, since the next saved memory is at
-@code{0x7000 + 0x1000}, or @code{0x8000}.
-
-@item adbg_find_memory_in_frame (f, (char *) 0xf000, &buffer, &size)
-This would set @code{size} to zero, and return
-@code{NOT_FOUND_TARGET_RESPONSE}.  This shows how the function tells the
-caller that no further memory ranges have been saved.
-
-@end table
-
-As another example, here is a function which will print out the
-addresses of all memory saved in the trace frame @code{frame} on the
-Symmetrix INLINES console:
-@example
-void
-print_frame_addresses (FRAME_DEF *frame)
-@{
-  char *addr;
-  char *buffer;
-  unsigned long size;
-
-  addr = 0;
-  for (;;)
-    @{
-      /* Either find out how much memory we have here, or discover
-         where the next saved region is.  */
-      if (adbg_find_memory_in_frame (frame, addr, &buffer, &size)
-          == OK_TARGET_RESPONSE)
-        printp ("saved %x to %x\n", addr, addr + size);
-      if (size == 0)
-        break;
-      addr += size;
-    @}
-@}
-@end example
-
-Note that there is not necessarily any connection between the order in
-which the data is saved in the trace frame, and the order in which
-@code{adbg_find_memory_in_frame} will return those memory ranges.  The
-code above will always print the saved memory regions in order of
-increasing address, while the underlying frame structure might store the
-data in a random order.
-
-[[This section should cover the rest of the Symmetrix functions the stub
-relies upon, too.]]
-
-@node Rationale
-@section Rationale
-
-Some of the design decisions apparent above are arguable.
-
-@table @b
-
-@item What about stack overflow/underflow?
-GDB should be able to query the target to discover its stack size.
-Given that information, GDB can determine at translation time whether a
-given expression will overflow the stack.  But this spec isn't about
-what kinds of error-checking GDB ought to do.
-
-@item Why are you doing everything in LONGEST?
-
-Speed isn't important, but agent code size is; using LONGEST brings in a
-bunch of support code to do things like division, etc.  So this is a
-serious concern.
-
-First, note that you don't need different bytecodes for different
-operand sizes.  You can generate code without @emph{knowing} how big the
-stack elements actually are on the target.  If the target only supports
-32-bit ints, and you don't send any 64-bit bytecodes, everything just
-works.  The observation here is that the MIPS and the Alpha have only
-fixed-size registers, and you can still get C's semantics even though
-most instructions only operate on full-sized words.  You just need to
-make sure everything is properly sign-extended at the right times.  So
-there is no need for 32- and 64-bit variants of the bytecodes.  Just
-implement everything using the largest size you support.
-
-GDB should certainly check to see what sizes the target supports, so the
-user can get an error earlier, rather than later.  But this information
-is not necessary for correctness.
-
-
-@item Why don't you have @code{>} or @code{<=} operators?
-I want to keep the interpreter small, and we don't need them.  We can
-combine the @code{less_} opcodes with @code{log_not}, and swap the order
-of the operands, yielding all four asymmetrical comparison operators.
-For example, @code{(x <= y)} is @code{! (x > y)}, which is @code{! (y <
-x)}.
-
-@item Why do you have @code{log_not}?
-@itemx Why do you have @code{ext}?
-@itemx Why do you have @code{zero_ext}?
-These are all easily synthesized from other instructions, but I expect
-them to be used frequently, and they're simple, so I include them to
-keep bytecode strings short.
-
-@code{log_not} is equivalent to @code{const8 0 equal}; it's used in half
-the relational operators.
-
-@code{ext @var{n}} is equivalent to @code{const8 @var{s-n} lsh const8
-@var{s-n} rsh_signed}, where @var{s} is the size of the stack elements;
-it follows @code{ref@var{m}} and @var{reg} bytecodes when the value
-should be signed.  See the next bulleted item.
-
-@code{zero_ext @var{n}} is equivalent to @code{const@var{m} @var{mask}
-log_and}; it's used whenever we push the value of a register, because we
-can't assume the upper bits of the register aren't garbage.
-
-@item Why not have sign-extending variants of the @code{ref} operators?
-Because that would double the number of @code{ref} operators, and we
-need the @code{ext} bytecode anyway for accessing bitfields.
-
-@item Why not have constant-address variants of the @code{ref} operators?
-Because that would double the number of @code{ref} operators again, and
-@code{const32 @var{address} ref32} is only one byte longer.
-
-@item Why do the @code{ref@var{n}} operators have to support unaligned fetches?
-GDB will generate bytecode that fetches multi-byte values at unaligned
-addresses whenever the executable's debugging information tells it to.
-Furthermore, GDB does not know the value the pointer will have when GDB
-generates the bytecode, so it cannot determine whether a particular
-fetch will be aligned or not.
-
-In particular, structure bitfields may be several bytes long, but follow
-no alignment rules; members of packed structures are not necessarily
-aligned either.
-
-In general, there are many cases where unaligned references occur in
-correct C code, either at the programmer's explicit request, or at the
-compiler's discretion.  Thus, it is simpler to make the GDB agent
-bytecodes work correctly in all circumstances than to make GDB guess in
-each case whether the compiler did the usual thing.
-
-@item Why are there no side-effecting operators?
-Because our current client doesn't want them?  That's a cheap answer.  I
-think the real answer is that I'm afraid of implementing function
-calls.  We should re-visit this issue after the present contract is
-delivered.
-
-@item Why aren't the @code{goto} ops PC-relative?
-The interpreter has the base address around anyway for PC bounds
-checking, and it seemed simpler.
-
-@item Why is there only one offset size for the @code{goto} ops?
-Offsets are currently sixteen bits.  I'm not happy with this situation
-either:
-
-Suppose we have multiple branch ops with different offset sizes.  As I
-generate code left-to-right, all my jumps are forward jumps (there are
-no loops in expressions), so I never know the target when I emit the
-jump opcode.  Thus, I have to either always assume the largest offset
-size, or do jump relaxation on the code after I generate it, which seems
-like a big waste of time.
-
-I can imagine a reasonable expression being longer than 256 bytes.  I
-can't imagine one being longer than 64k.  Thus, we need 16-bit offsets.
-This kind of reasoning is so bogus, but relaxation is pathetic.
-
-The other approach would be to generate code right-to-left.  Then I'd
-always know my offset size.  That might be fun.
-
-@item Where is the function call bytecode?
-
-When we add side-effects, we should add this.
-
-@item Why does the @code{reg} bytecode take a 16-bit register number?
-
-Intel's IA-64 architecture has 128 general-purpose registers,
-and 128 floating-point registers, and I'm sure it has some random
-control registers.
-
-@item Why do we need @code{trace} and @code{trace_quick}?
-Because GDB needs to record all the memory contents and registers an
-expression touches.  If the user wants to evaluate an expression
-@code{x->y->z}, the agent must record the values of @code{x} and
-@code{x->y} as well as the value of @code{x->y->z}.
-
-@item Don't the @code{trace} bytecodes make the interpreter less general?
-They do mean that the interpreter contains special-purpose code, but
-that doesn't mean the interpreter can only be used for that purpose.  If
-an expression doesn't use the @code{trace} bytecodes, they don't get in
-its way.
-
-@item Why doesn't @code{trace_quick} consume its arguments the way everything else does?
-In general, you do want your operators to consume their arguments; it's
-consistent, and generally reduces the amount of stack rearrangement
-necessary.  However, @code{trace_quick} is a kludge to save space; it
-only exists so we needn't write @code{dup const8 @var{SIZE} trace}
-before every memory reference.  Therefore, it's okay for it not to
-consume its arguments; it's meant for a specific context in which we
-know exactly what it should do with the stack.  If we're going to have a
-kludge, it should be an effective kludge.
-
-@item Why does @code{trace16} exist?
-That opcode was added by the customer that contracted Cygnus for the
-data tracing work.  I personally think it is unnecessary; objects that
-large will be quite rare, so it is okay to use @code{dup const16
-@var{size} trace} in those cases.
-
-Whatever we decide to do with @code{trace16}, we should at least leave
-opcode 0x30 reserved, to remain compatible with the customer who added
-it.
-
-@end table
-
-@bye
author	nobody <>	2002-09-07 00:00:05 +0000
committer	nobody <>	2002-09-07 00:00:05 +0000
commit	c1aa2a27e755c883b5c49b223120dfb712ea4e28 (patch)
tree	a98633075cd1f2b034b49446e83e522708d11f68 /gdb/doc/agentexpr.texi
parent	2e3c0e2427295c9cc09a8a707dfba38d50e2ba30 (diff)
download	binutils-sid-20020905-branch.zip binutils-sid-20020905-branch.tar.gz binutils-sid-20020905-branch.tar.bz2