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Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)

From: Hui Zhu <teawater at gmail dot com>
To: Pedro Alves <pedro at codesourcery dot com>
Cc: Stan Shebs <stan at codesourcery dot com>, Doug Evans <dje at google dot com>, "gdb-patches at sourceware dot org" <gdb-patches at sourceware dot org>, Eli Zaretskii <eliz at gnu dot org>, "tromey at redhat dot com" <tromey at redhat dot com>, Michael Snyder <msnyder at vmware dot com>
Date: Sun, 20 Jun 2010 00:12:41 +0800
Subject: Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)
References: <201006071700.28706.pedro@codesourcery.com> <AANLkTil-l0clTtXYlvOVEVba2Vvq5EAVCpyCBDDQGC5l@mail.gmail.com> <4C19222C.2000208@codesourcery.com> <201006162016.18181.pedro@codesourcery.com> <4C19265B.7090502@codesourcery.com> <4C1A6362.3020306@vmware.com>

lubuntu 10.04:

make[4]: ?????? `/home/teawater/gdb/bgdball/gdb/gdbserver'
rm -f gdbserver
gcc -Wall -g -O2    -I. -I../../../src/gdb/gdbserver
-I../../../src/gdb/gdbserver/../common
-I../../../src/gdb/gdbserver/../regformats
-I../../../src/gdb/gdbserver/../../include
-Wl,--dynamic-list=../../../src/gdb/gdbserver/proc-service.list -o
gdbserver inferiors.o regcache.o remote-utils.o server.o signals.o
target.o utils.o version.o mem-break.o hostio.o event-loop.o
tracepoint.o xml-builtin.o i386-linux.o i386-avx-linux.o
i386-mmx-linux.o linux-low.o linux-x86-low.o i386-low.o i387-fp.o
hostio-errno.o thread-db.o proc-service.o  \
	  -ldl
linux-x86-low.o: In function `i386_emit_void_call_2':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2426:
undefined reference to `end_i386_void_call_2_a'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2426:
undefined reference to `start_i386_void_call_2_a'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2426:
undefined reference to `start_i386_void_call_2_a'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2447:
undefined reference to `end_i386_void_call_2_b'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2447:
undefined reference to `start_i386_void_call_2_b'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2447:
undefined reference to `start_i386_void_call_2_b'
linux-x86-low.o: In function `i386_emit_int_call_1':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2398:
undefined reference to `end_i386_int_call_1_a'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2398:
undefined reference to `start_i386_int_call_1_a'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2398:
undefined reference to `start_i386_int_call_1_a'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2412:
undefined reference to `end_i386_int_call_1_c'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2412:
undefined reference to `start_i386_int_call_1_c'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2412:
undefined reference to `start_i386_int_call_1_c'
linux-x86-low.o: In function `i386_emit_swap':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2364:
undefined reference to `end_i386_swap'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2364:
undefined reference to `start_i386_swap'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2364:
undefined reference to `start_i386_swap'
linux-x86-low.o: In function `i386_emit_zero_ext':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2343:
undefined reference to `end_i386_zero_ext_8'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2343:
undefined reference to `start_i386_zero_ext_8'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2343:
undefined reference to `start_i386_zero_ext_8'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2353:
undefined reference to `end_i386_zero_ext_32'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2353:
undefined reference to `start_i386_zero_ext_32'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2353:
undefined reference to `start_i386_zero_ext_32'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2348:
undefined reference to `end_i386_zero_ext_16'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2348:
undefined reference to `start_i386_zero_ext_16'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2348:
undefined reference to `start_i386_zero_ext_16'
linux-x86-low.o: In function `i386_emit_stack_flush':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2332:
undefined reference to `end_i386_stack_flush'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2332:
undefined reference to `start_i386_stack_flush'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2332:
undefined reference to `start_i386_stack_flush'
linux-x86-low.o: In function `i386_emit_pop':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2324:
undefined reference to `end_i386_pop'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2324:
undefined reference to `start_i386_pop'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2324:
undefined reference to `start_i386_pop'
linux-x86-low.o: In function `i386_emit_goto':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2227:
undefined reference to `end_i386_goto'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2227:
undefined reference to `start_i386_goto'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2227:
undefined reference to `start_i386_goto'
linux-x86-low.o: In function `i386_emit_if_goto':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2209:
undefined reference to `end_i386_if_goto'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2209:
undefined reference to `start_i386_if_goto'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2209:
undefined reference to `start_i386_if_goto'
linux-x86-low.o: In function `i386_emit_ref':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2187:
undefined reference to `end_i386_ref1'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2187:
undefined reference to `start_i386_ref1'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2187:
undefined reference to `start_i386_ref1'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2199:
undefined reference to `end_i386_ref8'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2199:
undefined reference to `start_i386_ref8'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2199:
undefined reference to `start_i386_ref8'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2191:
undefined reference to `end_i386_ref2'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2191:
undefined reference to `start_i386_ref2'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2191:
undefined reference to `start_i386_ref2'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2195:
undefined reference to `end_i386_ref4'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2195:
undefined reference to `start_i386_ref4'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2195:
undefined reference to `start_i386_ref4'
linux-x86-low.o: In function `i386_emit_less_unsigned':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2165:
undefined reference to `end_i386_less_unsigned'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2165:
undefined reference to `start_i386_less_unsigned'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2165:
undefined reference to `start_i386_less_unsigned'
linux-x86-low.o: In function `i386_emit_less_signed':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2146:
undefined reference to `end_i386_less_signed'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2146:
undefined reference to `start_i386_less_signed'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2146:
undefined reference to `start_i386_less_signed'
linux-x86-low.o: In function `i386_emit_equal':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2128:
undefined reference to `end_i386_equal'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2128:
undefined reference to `start_i386_equal'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2128:
undefined reference to `start_i386_equal'
linux-x86-low.o: In function `i386_emit_bit_not':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2120:
undefined reference to `end_i386_bit_not'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2120:
undefined reference to `start_i386_bit_not'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2120:
undefined reference to `start_i386_bit_not'
linux-x86-low.o: In function `i386_emit_bit_xor':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2111:
undefined reference to `end_i386_xor'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2111:
undefined reference to `start_i386_xor'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2111:
undefined reference to `start_i386_xor'
linux-x86-low.o: In function `i386_emit_bit_or':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2102:
undefined reference to `end_i386_or'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2102:
undefined reference to `start_i386_or'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2102:
undefined reference to `start_i386_or'
linux-x86-low.o: In function `i386_emit_bit_and':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2093:
undefined reference to `end_i386_and'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2093:
undefined reference to `start_i386_and'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2093:
undefined reference to `start_i386_and'
linux-x86-low.o: In function `i386_emit_log_not':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2082:
undefined reference to `end_i386_log_not'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2082:
undefined reference to `start_i386_log_not'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2082:
undefined reference to `start_i386_log_not'
linux-x86-low.o: In function `i386_emit_ext':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2057:
undefined reference to `end_i386_ext_8'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2057:
undefined reference to `start_i386_ext_8'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2057:
undefined reference to `start_i386_ext_8'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2070:
undefined reference to `end_i386_ext_32'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2070:
undefined reference to `start_i386_ext_32'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2070:
undefined reference to `start_i386_ext_32'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2064:
undefined reference to `end_i386_ext_16'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2064:
undefined reference to `start_i386_ext_16'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2064:
undefined reference to `start_i386_ext_16'
linux-x86-low.o: In function `i386_emit_sub':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2020:
undefined reference to `end_i386_sub'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2020:
undefined reference to `start_i386_sub'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2020:
undefined reference to `start_i386_sub'
linux-x86-low.o: In function `i386_emit_add':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2011:
undefined reference to `end_i386_add'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2011:
undefined reference to `start_i386_add'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2011:
undefined reference to `start_i386_add'
linux-x86-low.o: In function `i386_emit_epilogue':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:1999:
undefined reference to `end_i386_epilogue'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:1999:
undefined reference to `start_i386_epilogue'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:1999:
undefined reference to `start_i386_epilogue'
linux-x86-low.o: In function `i386_emit_prologue':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:1989:
undefined reference to `end_i386_prologue'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:1989:
undefined reference to `start_i386_prologue'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:1989:
undefined reference to `start_i386_prologue'
linux-x86-low.o: In function `i386_emit_reg':
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2302:
undefined reference to `end_i386_reg_a'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2302:
undefined reference to `start_i386_reg_a'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2302:
undefined reference to `start_i386_reg_a'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2311:
undefined reference to `end_i386_reg_b'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2311:
undefined reference to `start_i386_reg_b'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2311:
undefined reference to `start_i386_reg_b'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2316:
undefined reference to `end_i386_reg_c'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2316:
undefined reference to `start_i386_reg_c'
/home/teawater/gdb/bgdball/gdb/gdbserver/../../../src/gdb/gdbserver/linux-x86-low.c:2316:
undefined reference to `start_i386_reg_c'
collect2: ld returned 1 exit status
make[4]: *** [gdbserver] ?? 1
make[4]:?????? `/home/teawater/gdb/bgdball/gdb/gdbserver'
make[3]: *** [subdir_do] ?? 1
make[3]:?????? `/home/teawater/gdb/bgdball/gdb'
make[2]: *** [all] ?? 2
make[2]:?????? `/home/teawater/gdb/bgdball/gdb'
make[1]: *** [all-gdb] ?? 2
make[1]:?????? `/home/teawater/gdb/bgdball'


On Fri, Jun 18, 2010 at 02:03, Michael Snyder <msnyder@vmware.com> wrote:
> Stan Shebs wrote:
>>
>> Pedro Alves wrote:
>>>
>>> On Wednesday 16 June 2010 20:12:44, Stan Shebs wrote:
>>>
>>>>
>>>> Doug Evans wrote:
>>>>
>>>>>
>>>>> On Mon, Jun 14, 2010 at 3:19 PM, Pedro Alves <pedro@codesourcery.com>
>>>>> wrote:
>>>>>
>>>>>>
>>>>>> Thanks. ?I've checked the whole thing in.
>>>>>>
>>>>>
>>>>> I'm getting build failures that go away when compiling linux-x86-low.c
>>>>> with -g.
>>>>>
>>>>> gcc is optimizing out the skipped over stuff I believe.
>>>>>
>>>>
>>>> Hmm, this particular trickery was my idea, but it always seemed
>>>> vulnerable to ever-smarter optimization. ?Does anybody have any better
>>>> strategy? ?Declaring the asm volatile didn't work, because the compiler was
>>>> whacking everything around it.
>>>>
>>>> The other approach is to build up instructions from bitfields, which is
>>>> reliable but needs a lot of setup and helper routines.
>>>>
>>>
>>> Quick thought: can we stick a couple of __attribute__((used))'s in the
>>> macro, so the compiler doesn optimized things away, thinking they're
>>> unused (given the uses are behind asm)?
>>>
>>
>> The compiler is discarding the code with the definitions of the labels,
>> because it's thinking they are maybe somewhere else in the program (the
>> error is at link time). ?Moving the labels into C code would fix that I
>> think, but then it's hard to guarantee that the compiler won't sneak in a
>> bit of code between label and asm sequence.
>
> Hurrr. ?Code that depends on such deep knowledge of the compiler's
> behavior is wrong code, IMO.
>
>

Follow-Ups:
- Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)
  - From: Doug Evans
- Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)
  - From: Tom Tromey

References:
- [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)
  - From: Pedro Alves
- Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)
  - From: Doug Evans
- Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)
  - From: Stan Shebs
- Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)
  - From: Pedro Alves
- Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)
  - From: Stan Shebs
- Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler (speed up conditional tracepoints)
  - From: Michael Snyder

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