gcc (GCC) 4.5.0 20100117 (experimental)
x86_64-unknown-linux-gnu running -m32
Reproduced on Fedora 12: gcc-4.4.2-20.fc12.x86_64
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extern void g (void);
int
f (int a)
{
g ();
return a;
}
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gcc -o 1.o -c -Wall 1.c -m32 -O1 -g -Wall
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0: 55 push %ebp
1: 89 e5 mov %esp,%ebp
3: 83 ec 08 sub $0x8,%esp
6: e8 fc ff ff ff call 7 <f+0x7>
b: 8b 45 08 mov 0x8(%ebp),%eax
e: c9 leave
f: c3 ret
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Contents of the .debug_info section:
<2><40>: Abbrev Number: 3 (DW_TAG_formal_parameter)
<41> DW_AT_name : a
<49> DW_AT_location : 0x38 (location list)
Contents of the .debug_loc section:
Offset Begin End Expression
00000038 00000000 0000000a (DW_OP_fbreg: 0)
00000038 <End of list>
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Offsets 0xb .. 0xf miss the A location.
The function must know it when it returns A.
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Practical impact:
Backtrace missed parameters of elf_lookup_lib_symbol() in:
https://bugzilla.redhat.com/show_bug.cgi?id=556310
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Summary: VTA missed location: parameter via stack
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: debug
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jan dot kratochvil at redhat dot com
GCC target triplet: i386-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42782
