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From: Nick Roberts <nickrob@snap.net.nz>
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Message-ID: <18420.39684.185853.891083@kahikatea.snap.net.nz>
Date: Thu, 03 Apr 2008 08:54:00 -0000
To: gdb@sourceware.org
Subject: Multiple breakpoints
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If I set a breakpoint on TRY_CATCH in gdb_evaluate_expression, I get
multiple breakpoints:

  gdb_evaluate_expression (struct expression *exp, struct value **value)
  {
    volatile struct gdb_exception except;

->  TRY_CATCH (except, RETURN_MASK_ERROR)
      {
        *value = evaluate_expression(exp);
      }

    if (except.reason < 0)
      return 0;
    return 1;
  }

where -> shows the breakpoint location.


Is this to be expected?  The assembler looks like this:


    0x081c04a1 <gdb_evaluate_expression+0>:	push   %ebp
    0x081c04a2 <gdb_evaluate_expression+1>:	mov    %esp,%ebp
    0x081c04a4 <gdb_evaluate_expression+3>:	sub    $0x28,%esp
->  0x081c04a7 <gdb_evaluate_expression+6>:	mov    0x83a55a0,%edx
    0x081c04ad <gdb_evaluate_expression+12>:	movl   $0x2,0x8(%esp)
    0x081c04b5 <gdb_evaluate_expression+20>:	lea    -0x10(%ebp),%eax
    0x081c04b8 <gdb_evaluate_expression+23>:	mov    %eax,0x4(%esp)
    0x081c04bc <gdb_evaluate_expression+27>:	mov    %edx,(%esp)
    0x081c04bf <gdb_evaluate_expression+30>:	call   0x814e660 <exce...
    0x081c04c4 <gdb_evaluate_expression+35>:	mov    %eax,-0x4(%ebp)
    0x081c04c7 <gdb_evaluate_expression+38>:	mov    -0x4(%ebp),%eax
    0x081c04ca <gdb_evaluate_expression+41>:	movl   $0x1,0x4(%esp)
    0x081c04d2 <gdb_evaluate_expression+49>:	mov    %eax,(%esp)
    0x081c04d5 <gdb_evaluate_expression+52>:	call   0x8089058 <__si...
    0x081c04da <gdb_evaluate_expression+57>:	jmp    0x81c04f7 <gdb_...
    0x081c04dc <gdb_evaluate_expression+59>:	mov    0x8(%ebp),%eax
    0x081c04df <gdb_evaluate_expression+62>:	mov    %eax,(%esp)
    0x081c04e2 <gdb_evaluate_expression+65>:	call   0x810fc5e <eval...
    0x081c04e7 <gdb_evaluate_expression+70>:	mov    %eax,%edx
    0x081c04e9 <gdb_evaluate_expression+72>:	mov    0xc(%ebp),%eax
    0x081c04ec <gdb_evaluate_expression+75>:	mov    %edx,(%eax)
->  0x081c04ee <gdb_evaluate_expression+77>:	call   0x814e983 <exce...
    0x081c04f3 <gdb_evaluate_expression+82>:	test   %eax,%eax
    0x081c04f5 <gdb_evaluate_expression+84>:	jne    0x81c04dc <gdb_...
    0x081c04f7 <gdb_evaluate_expression+86>:	call   0x814e96f <exce...
    0x081c04fc <gdb_evaluate_expression+91>:	test   %eax,%eax
    0x081c04fe <gdb_evaluate_expression+93>:	jne    0x81c04ee <gdb_...
    0x081c0500 <gdb_evaluate_expression+95>:	mov    -0x10(%ebp),%ea
    0x081c0503 <gdb_evaluate_expression+98>:	test   %eax,%eax
    0x081c0505 <gdb_evaluate_expression+100>:	jns    0x81c0510 <gdb_...
    0x081c0507 <gdb_evaluate_expression+102>:	movl   $0x0,-0x14(%ebp
    0x081c050e <gdb_evaluate_expression+109>:	jmp    0x81c0517 <gdb_...
    0x081c0510 <gdb_evaluate_expression+111>:	movl   $0x1,-0x14(%ebp)
    0x081c0517 <gdb_evaluate_expression+118>:	mov    -0x14(%ebp),%eax
    0x081c051a <gdb_evaluate_expression+121>:	leave  
    0x081c051b <gdb_evaluate_expression+122>:	ret    
    End of assembler dump.


-- 
Nick                                           http://www.inet.net.nz/~nickrob