http://llvm.org/bugs/show_bug.cgi?id=14966
Bug #: 14966
Summary: A debug info issue when passing a struct by value
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected],
[email protected]
Classification: Unclassified
There's an issue with debug information when passing a particular struct by
value.
$ head -n 100 z.cc zz.cc
==> z.cc <==
enum A {A_1};
typedef struct { enum A a; int b; const void *c[3]; } S;
const void *f2(S s);
__attribute__((noinline)) const void *f1(S s) {
return f2(s);
}
int main() {
S s = { A_1, 1, {(const void*)10, (const void*)20, (const void*)30} };
f1(s);
}
==> zz.cc <==
enum A {A_1};
typedef struct { enum A a; int b; const void *c[3]; } S;
const void *f2(S s) {
return s.c[2];
}
$ gdb ./a.out
GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /tmp/yyy/a.out...done.
(gdb) b main
Breakpoint 1 at 0x4005f4: file z.cc, line 11.
(gdb) r
Starting program: /tmp/yyy/a.out
Breakpoint 1, main () at z.cc:11
11 S s = { A_1, 1, {(const void*)10, (const void*)20, (const void*)30}
};
(gdb) n
12 f1(s);
(gdb) s
f1 (s=...) at z.cc:7
7 return f2(s);
(gdb) p s
$1 = {a = 4294959648, b = 32767, c = {0x7ffff7639320, 0x7ffff7deb310, 0x0}} //
<--- what?
(gdb) s
f2 (s=...) at zz.cc:4
4 const void *f2(S s) {
(gdb) n
5 return s.c[2];
(gdb) p s
$2 = {a = A_1, b = 1, c = {0xa, 0x14, 0x1e}}
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