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Fix PR gdb/19858: GDB doesn't register the JIT libraries on attach

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Ref: https://sourceware.org/ml/gdb/2016-03/msg00023.html

GDB currently fails to fetch the list of already-registered JIT
modules on attach.

Nothing is calling jit_inferior_init, which is what is responsible for
walking the JIT object list at init time.

Despite the misleading naming, jit_inferior_created_hook ->
jit_inferior_init is only called when the inferior execs.

This regressed with the fix for PR gdb/13431 (03bef283c2):
 https://sourceware.org/ml/gdb-patches/2012-02/msg00023.html which
removed the inferior_created (jit_inferior_created_observer)
observer.

Adding an inferior_created observer back fixes the issue.

In turn, this exposes a bug in jit_breakpoint_re_set_internal as well,
which is returning the wrong result when we already have the
breakpoint at the right address.

gdb/ChangeLog:
2016-03-31  Yichao Yu  <yyc1992@gmail.com>

	PR gdb/19858
	* jit.c (jit_breakpoint_re_set_internal): Return 0 if we already
	got the breakpoint at the right address.
	(jit_inferior_created): New function.
	(_initialize_jit): Install jit_inferior_created as
	inferior_created observer.

Signed-off-by: Pedro Alves <palves@redhat.com>
This commit is contained in:
Yichao Yu 2016-03-31 19:28:47 +01:00 • committed by Pedro Alves
parent 22084c425e
commit 9bb84c9f97
2 changed files with 20 additions and 2 deletions
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9
gdb/ChangeLog
View file

@ -1,3 +1,12 @@
2016-03-31 Yichao Yu <yyc1992@gmail.com>
PR gdb/19858
* jit.c (jit_breakpoint_re_set_internal): Return 0 if we already
got the breakpoint at the right address.
(jit_inferior_created): New function.
(_initialize_jit): Install jit_inferior_created as
inferior_created observer.
2016-03-31 Marcin Kościelnicki <koriakin@0x04.net>
* NEWS: Mention support for tracepoints on powerpc*-linux.

13
gdb/jit.c
View file

@ -1026,7 +1026,7 @@ jit_breakpoint_deleted (struct breakpoint *b)
}
/* (Re-)Initialize the jit breakpoint if necessary.
Return 0 on success. */
Return 0 if the jit breakpoint has been successfully initialized. */
static int
jit_breakpoint_re_set_internal (struct gdbarch *gdbarch,
@ -1070,7 +1070,7 @@ jit_breakpoint_re_set_internal (struct gdbarch *gdbarch,
paddress (gdbarch, addr));
if (ps_data->cached_code_address == addr)
return 1;
return 0;
/* Delete the old breakpoint. */
if (ps_data->jit_breakpoint != NULL)
@ -1367,6 +1367,14 @@ jit_inferior_init (struct gdbarch *gdbarch)
}
}
/* inferior_created observer. */
static void
jit_inferior_created (struct target_ops *ops, int from_tty)
{
jit_inferior_created_hook ();
}
/* Exported routine to call when an inferior has been created. */
void
@ -1496,6 +1504,7 @@ _initialize_jit (void)
show_jit_debug,
&setdebuglist, &showdebuglist);
observer_attach_inferior_created (jit_inferior_created);
observer_attach_inferior_exit (jit_inferior_exit_hook);
observer_attach_breakpoint_deleted (jit_breakpoint_deleted);