[Bug breakpoints/10112] do not stop on function

["ppluzhnikov at google dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From ppluzhnikov at google dot com  2009-10-22 17:47 -------
This sounds very familiar:

  Extended opcode 2: set Address to 0x80483e4
  Special opcode 8: advance Address by 0 to 0x80483e4 and Line by 3 to 4
  Advance PC by constant 17 to 0x80483f5
GDB sets breakpoint here ==>
  Special opcode 49: advance Address by 3 to 0x80483f8 and Line by 2 to 6
  Special opcode 62: advance Address by 4 to 0x80483fc and Line by 1 to 7
but should have set it here instead ==>
  Special opcode 199: advance Address by 14 to 0x804840a and Line by -2 to 5

I am about 95% certain this was fixed on the GCC side.
FWIW, in my (patched) GCC-4.3.1, the line table looks like this:

  Extended opcode 2: set Address to 0x8048260
  Special opcode 8: advance Address by 0 to 0x8048260 and Line by 3 to 4
  Advance PC by constant 17 to 0x8048271
This is the entry which causes GDB to work correctly ==>
  Special opcode 20: advance Address by 1 to 0x8048272 and Line by 1 to 5
  Special opcode 34: advance Address by 2 to 0x8048274 and Line by 1 to 6
  Special opcode 62: advance Address by 4 to 0x8048278 and Line by 1 to 7
  Special opcode 199: advance Address by 14 to 0x8048286 and Line by -2 to 5

And the corresponding disassembly:

(gdb) disas/m f
Dump of assembler code for function f:
4       {
   0x08048260 <+0>:     push   %ebp
   0x08048261 <+1>:     mov    %esp,%ebp
   0x08048263 <+3>:     sub    $0x18,%esp
   0x08048266 <+6>:     mov    0xc(%ebp),%eax
   0x08048269 <+9>:     mov    %eax,-0x8(%ebp)
   0x0804826c <+12>:    mov    0x10(%ebp),%eax
   0x0804826f <+15>:    mov    %eax,-0x4(%ebp)

5               while (gsec < 0.0) {
   0x08048272 <+18>:    jmp    0x8048286 <f+38>
   0x08048286 <+38>:    fldl   -0x8(%ebp)
   0x08048289 <+41>:    fldz   
   0x0804828b <+43>:    fucomip %st(1),%st
   0x0804828d <+45>:    fstp   %st(0)
   0x0804828f <+47>:    ja     0x8048274 <f+20>
   0x08048291 <+49>:    jmp    0x80482a5 <f+69>

6                       gwk--;
   0x08048274 <+20>:    subl   $0x1,0x8(%ebp)

7                       gsec += 604800.0;
   0x08048278 <+24>:    fldl   -0x8(%ebp)
   0x0804827b <+27>:    fldl   0x80483c8
   0x08048281 <+33>:    faddp  %st,%st(1)
   0x08048283 <+35>:    fstpl  -0x8(%ebp)

8               }


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http://sourceware.org/bugzilla/show_bug.cgi?id=10112

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