struct a
{
int i;
int j;
};
static void g (int j)
{
}
static struct a f()
{
struct a a;
a.i = 42;
g (a.i); /* line 13 */
return a;
}
int
main ()
{
f();
return 0;
}
------------------------------------------------------------------------------
<2><8a>: Abbrev Number: 8 (DW_TAG_variable)
<8b> DW_AT_name : a
<93> DW_AT_location : 2 byte block: 73 0 (DW_OP_breg3: 0)
<2><96>: Abbrev Number: 9 (DW_TAG_lexical_block)
<97> DW_AT_low_pc : 0x80483d3
<9b> DW_AT_high_pc : 0x80483e3
<3><9f>: Abbrev Number: 8 (DW_TAG_variable)
<a0> DW_AT_name : a
<a8> DW_AT_location : 2 byte block: 91 6c (DW_OP_fbreg: -20)
- but `a' is never located in the frame.
------------------------------------------------------------------------------
g++ -m32 -o a a.C -Wall -g
gdb -nx -ex 'b 13' -ex r -ex 'p/x $pc' -ex 'p a.i' ./a
Actual:
$2 = 5823984
Expected:
$2 = 42
------------------------------------------------------------------------------
FAIL:
g++ (GCC) 4.6.0 20100601 (experimental)
g++ (GCC) 4.5.1 20100601 (prerelease)
g++ (GCC) 4.4.5 20100601 (prerelease)
It affects also x86_64 when it cannot return the whole class in registers.
Failed to reproduce it with plain C.
--
Summary: -O0 -g wrong DW_AT_location on c++ class retval
Product: gcc
Version: 4.4.5
Status: UNCONFIRMED
Severity: normal
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=44367
