http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58123
Bug ID: 58123
Summary: [4.8 Regression] debug line not tracked for last
autovariable dtor
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: jan.kratochvil at redhat dot com
Target: x86_64-unknown-linux-gnu
PASS: g++ (GCC) 4.7.3 20130221 (prerelease)
- it did not generate separate line info for destructors at all
FAIL: g++ (GCC) 4.8.2 20130811 (prerelease)
FAIL: g++ (GCC) 4.9.0 20130811 (experimental)
class C {
public:
C() {}
~C() {}
int m() { return 0; }
};
/* 7 */ int main() {
/* 8 */ C a;
/* 9 */ C b;
/* 10 */ C c;
/* 11 */ return a.m() + b.m() + c.m();
/* 12 */ }
----------------------------------------------------------------------------
g++-4.7:
(gdb) start
8 /* 8 */ C a;
(gdb) next
9 /* 9 */ C b;
(gdb) next
10 /* 10 */ C c;
(gdb) next
11 /* 11 */ return a.m() + b.m() + c.m();
(gdb) next
12 /* 12 */ }
----------------------------------------------------------------------------
g++-4.8: each destructor has its own .debug_line entry:
(gdb) start
8 /* 8 */ C a;
(gdb) next
9 /* 9 */ C b;
(gdb) next
10 /* 10 */ C c;
(gdb) next
11 /* 11 */ return a.m() + b.m() + c.m();
(gdb) next
10 /* 10 */ C c;
(gdb) next
9 /* 9 */ C b;
(gdb) next
################## Missing: /* 8 */ C a;
11 /* 11 */ return a.m() + b.m() + c.m();
(gdb) next
12 /* 12 */ }
except for the last one:
/home/jkratoch/t/example2.C:10
4005f7: 48 8d 45 ed lea -0x13(%rbp),%rax
4005fb: 48 89 c7 mov %rax,%rdi
4005fe: e8 2b 00 00 00 callq 40062e <C::~C()>
/home/jkratoch/t/example2.C:9
400603: 48 8d 45 ee lea -0x12(%rbp),%rax
400607: 48 89 c7 mov %rax,%rdi
40060a: e8 1f 00 00 00 callq 40062e <C::~C()>
/home/jkratoch/t/example2.C:11
############################^^ here should be :8
40060f: 48 8d 45 ef lea -0x11(%rbp),%rax
400613: 48 89 c7 mov %rax,%rdi
400616: e8 13 00 00 00 callq 40062e <C::~C()>
############################ Missing debug line for :11 or :12 here:
40061b: 89 d8 mov %ebx,%eax
/home/jkratoch/t/example2.C:12
40061d: 48 83 c4 18 add $0x18,%rsp
400621: 5b pop %rbx
400622: 5d pop %rbp
400623: c3 retq
Downstream user bugreport: https://bugzilla.redhat.com/show_bug.cgi?id=995804
