public inbox for gdb-cvs@sourceware.org
help / color / mirror / Atom feed
* [binutils-gdb] Bug fix in commit for printing the function return value for non-trivial values
@ 2022-11-16 16:12 Carl Love
0 siblings, 0 replies; only message in thread
From: Carl Love @ 2022-11-16 16:12 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d2bbd19d8e16370ebb853e2bf436e5b282177830
commit d2bbd19d8e16370ebb853e2bf436e5b282177830
Author: Carl Love <cel@us.ibm.com>
Date: Tue Nov 15 10:57:32 2022 -0600
Bug fix in commit for printing the function return value for non-trivial values
The recent commit:
commit a0eda3df5b750ae32576a9be092b361281a41787
Author: Carl Love <cel@us.ibm.com>
Date: Mon Nov 14 16:22:37 2022 -0500
PowerPC, fix support for printing the function return value for non-trivial values.
Is generating a segmentation fault on x86_64-linux.
segfault:
...
PASS: gdb.asm/asm-source.exp: info source asmsrc1.s
ERROR: GDB process no longer exists
UNRESOLVED: gdb.asm/asm-source.exp: finish from foo3
...
Reproduced on command line:
...
$ gdb -q -batch -x outputs/gdb.asm/asm-source/gdb.in.1
...
The problem seems to be that:
...
Thread 1 "gdb" received signal SIGSEGV, Segmentation fault.
0x000000000043de7a in symbol::type (this=0x0) at
.../gdb_versions/devel/src/gdb/symtab.h:1287
1287 return m_type;
...
because:
...
(gdb) up
#1 0x0000000000852d94 in finish_command (arg=0x0, from_tty=0)
at .../gdb_versions/devel/src/gdb/infcmd.c:1887
1887 = check_typedef (sm->function->type ()->target_type ());
(gdb) p sm->function
$1 = (symbol *) 0x0
The code is not checking if sm->function is NULL. If sm->function is NULL
the check for the return buffer should be skipped.
Diff:
---
gdb/infcmd.c | 30 ++++++++++++++++--------------
1 file changed, 16 insertions(+), 14 deletions(-)
diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index b71dc10370b..a72df2d6a01 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -1877,26 +1877,28 @@ finish_command (const char *arg, int from_tty)
/* Find the function we will return from. */
frame_info_ptr callee_frame = get_selected_frame (NULL);
sm->function = find_pc_function (get_frame_pc (callee_frame));
+ sm->return_buf = 0; /* Initialize buffer address is not available. */
/* Determine the return convention. If it is RETURN_VALUE_STRUCT_CONVENTION,
attempt to determine the address of the return buffer. */
- enum return_value_convention return_value;
- struct gdbarch *gdbarch = get_frame_arch (callee_frame);
+ if (sm->function != NULL)
+ {
+ enum return_value_convention return_value;
+ struct gdbarch *gdbarch = get_frame_arch (callee_frame);
- struct type * val_type
- = check_typedef (sm->function->type ()->target_type ());
+ struct type * val_type
+ = check_typedef (sm->function->type ()->target_type ());
- return_value = gdbarch_return_value (gdbarch,
- read_var_value (sm->function, NULL,
- callee_frame),
- val_type, NULL, NULL, NULL);
+ return_value = gdbarch_return_value (gdbarch,
+ read_var_value (sm->function, NULL,
+ callee_frame),
+ val_type, NULL, NULL, NULL);
- if (return_value == RETURN_VALUE_STRUCT_CONVENTION
- && val_type->code () != TYPE_CODE_VOID)
- sm->return_buf = gdbarch_get_return_buf_addr (gdbarch, val_type,
- callee_frame);
- else
- sm->return_buf = 0;
+ if (return_value == RETURN_VALUE_STRUCT_CONVENTION
+ && val_type->code () != TYPE_CODE_VOID)
+ sm->return_buf = gdbarch_get_return_buf_addr (gdbarch, val_type,
+ callee_frame);
+ }
/* Print info on the selected frame, including level number but not
source. */
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2022-11-16 16:12 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-11-16 16:12 [binutils-gdb] Bug fix in commit for printing the function return value for non-trivial values Carl Love
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).