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In-Reply-To: <201006142319.33577.pedro@codesourcery.com>
References: <201006071700.28706.pedro@codesourcery.com>	<201006141215.41726.pedro@codesourcery.com>	<831vc9jzg1.fsf@gnu.org>	<201006142319.33577.pedro@codesourcery.com>
Date: Wed, 16 Jun 2010 18:57:00 -0000
Message-ID: <AANLkTil-l0clTtXYlvOVEVba2Vvq5EAVCpyCBDDQGC5l@mail.gmail.com>
Subject: Re: [NEWS/RFA] Re: [gdbserver] x86 agent expression bytecode compiler 	(speed up conditional tracepoints)
From: Doug Evans <dje@google.com>
To: Pedro Alves <pedro@codesourcery.com>
Cc: gdb-patches@sourceware.org, Eli Zaretskii <eliz@gnu.org>,        tromey@redhat.com
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On Mon, Jun 14, 2010 at 3:19 PM, Pedro Alves <pedro@codesourcery.com> wrote:
>>
> Thanks. =A0I'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.


/* Our general strategy for emitting code is to avoid specifying raw
   bytes whenever possible, and instead copy a block of inline asm
   that is embedded in the function.  This is a little messy, because
   we need to keep the compiler from discarding what looks like dead
   code, plus suppress various warnings.  */

#define EMIT_ASM(NAME,INSNS)                                            \
  { extern unsigned char start_ ## NAME, end_ ## NAME;                  \
    add_insns (&start_ ## NAME, &end_ ## NAME - &start_ ## NAME);       \
    if (always_true ())                                         \
      goto skipover ## NAME;                                            \
    __asm__ ("start_" #NAME ":\n\t" INSNS "\n\tend_" #NAME ":\n\t");    \
    skipover ## NAME:                                                   \
    ; }