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* [Bug symtab/11479] New: Stabs qualified function argument with opaque type not dispalyed correctly
@ 2010-04-08 16:13 muller at ics dot u-strasbg dot fr
2010-04-23 15:04 ` [Bug symtab/11479] Stabs qualified function argument with opaque type not displayed correctly muller at ics dot u-strasbg dot fr
0 siblings, 1 reply; 2+ messages in thread
From: muller at ics dot u-strasbg dot fr @ 2010-04-08 16:13 UTC (permalink / raw)
To: gdb-prs
If a function is using qualified arguments with opaque types,
the size of this qualified type is not set correctly when the type
is resolved.
This leads to garbage output with GDB.
Example code:
struct dummy;
void *
test (const struct dummy *t)
{
struct dummy *tt;
tt = t;
return t;
}
void *
test2 (struct dummy *t)
{
struct dummy *tt;
tt = t;
return t;
}
struct dummy {
int x;
int y;
double b;
} tag_dummy;
int
main ()
{
struct dummy tt;
tt.x = 5;
tt.y = 25;
tt.b = 2.5;
test2 (&tt);
return test (&tt);
}
gcc -gstabs+ -o test test.c
gives the following output:
Pierre@d620-muller ~/gdbcvs/build-norm/gdb
$ gdb71.exe ./test
GNU gdb (GDB) 7.1
Copyright (C) 2010 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 "i686-pc-cygwin".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/local/src/gdbcvs/build-norm/gdb/test.exe...done.
Setting up the environment for debugging gdb.
Function "internal_error" not defined.
Make breakpoint pending on future shared library load? (y or [n]) [answered N; i
nput not from terminal]
Function "info_command" not defined.
Make breakpoint pending on future shared library load? (y or [n]) [answered N; i
nput not from terminal]
/usr/local/src/gdbcvs/build-norm/gdb/.gdbinit:8: Error in sourced command file:
No breakpoint number 0.
(gdb) rb test
Breakpoint 1 at 0x401056: file test.c, line 8.
void *test(const struct dummy *);
Breakpoint 2 at 0x401067: file test.c, line 16.
void *test2(struct dummy *);
(gdb) r
Starting program: /usr/local/src/gdbcvs/build-norm/gdb/test.exe
[New Thread 5388.0x774]
[New Thread 5388.0x1438]
Breakpoint 2, test2 (t=0x22cc80) at test.c:16
16 tt = t;
(gdb) p *t
$1 = {x = 5, y = 25, b = 2.5}
(gdb) c
Continuing.
Breakpoint 1, test (t=0x22cc80) at test.c:8
8 tt = t;
(gdb) p *t
$2 = {x = 0, y = 0, b = 5.3049894774131808e-313}
Using 'set debug target 1'
explains better what happens:
Breakpoint 2, test2 (t=0x22cc80) at test.c:16
16 tt = t;
(gdb) set debug target 1
(gdb) p *t
child:target_xfer_partial (2, (null), 0x1edea50, 0x0, 0x22cc50, 4) = 4, bytes =
80 cc 22 00
child:target_xfer_partial (2, (null), 0x1ede9d0, 0x0, 0x22cc80, 16) = 16, bytes
=
05 00 00 00 19 00 00 00 00 00 00 00 00 00 04 40
$5 = {x = 5, y = 25, b = 2.5}
(gdb) set debug target 0
(gdb) c
Continuing.
Breakpoint 1, test (t=0x22cc80) at test.c:8
8 tt = t;
(gdb) set debug target 1
(gdb) p *t
child:target_xfer_partial (2, (null), 0x202fc20, 0x0, 0x22cc50, 4) = 4, bytes =
80 cc 22 00
$6 = {x = 0, y = 0, b = 4.0317920028340174e-313}
(gdb) p sizeof (*t)
$7 = 0
If fact, the const qualifier in test function declaration
triggers the generation of a new structure type.
This new type does not get its size set when the structure
is resolved.
Tested both on windows and linux (32 bit generated code).
--
Summary: Stabs qualified function argument with opaque type not
dispalyed correctly
Product: gdb
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: symtab
AssignedTo: unassigned at sourceware dot org
ReportedBy: muller at ics dot u-strasbg dot fr
CC: gdb-prs at sourceware dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=11479
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* [Bug symtab/11479] Stabs qualified function argument with opaque type not displayed correctly
2010-04-08 16:13 [Bug symtab/11479] New: Stabs qualified function argument with opaque type not dispalyed correctly muller at ics dot u-strasbg dot fr
@ 2010-04-23 15:04 ` muller at ics dot u-strasbg dot fr
0 siblings, 0 replies; 2+ messages in thread
From: muller at ics dot u-strasbg dot fr @ 2010-04-23 15:04 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2010-04-22 12:31 -------
Subject: Bug 11479
CVSROOT: /cvs/src
Module name: src
Changes by: muller@sourceware.org 2010-04-22 12:30:55
Modified files:
gdb : ChangeLog stabsread.c
Log message:
PR stabs/11479.
* stabsread.c (set_length_in_type_chain): New function.
(read_struct_type): Call set_length_in_type_chain function.
(read_enum_type): Idem.
Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.11666&r2=1.11667
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/stabsread.c.diff?cvsroot=src&r1=1.124&r2=1.125
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2010-04-22 13:37 -------
Subject: Bug 11479
CVSROOT: /cvs/src
Module name: src
Changes by: muller@sourceware.org 2010-04-22 13:37:18
Modified files:
gdb/testsuite : ChangeLog
Added files:
gdb/testsuite/gdb.stabs: gdb11479.c gdb11479.exp
Log message:
PR stabs/11479.
* gdb.stabs/gdb11479.exp: New file.
* gdb.stabs/gdb11479.c: New file.
Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2247&r2=1.2248
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.stabs/gdb11479.c.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.stabs/gdb11479.exp.diff?cvsroot=src&r1=NONE&r2=1.1
------- Additional Comments From muller at ics dot u-strasbg dot fr 2010-04-23 15:04 -------
Fixed by the commits from 2010/04/22
listed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |FIXED
Summary|Stabs qualified function |Stabs qualified function
|argument with opaque type |argument with opaque type
|not dispalyed correctly |not displayed correctly
Target Milestone|7.1 |7.2
http://sourceware.org/bugzilla/show_bug.cgi?id=11479
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2010-04-08 16:13 [Bug symtab/11479] New: Stabs qualified function argument with opaque type not dispalyed correctly muller at ics dot u-strasbg dot fr
2010-04-23 15:04 ` [Bug symtab/11479] Stabs qualified function argument with opaque type not displayed correctly muller at ics dot u-strasbg dot fr
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