* [PATCH] Fix PR58300, issue with -fvtable-verify=preinit
@ 2013-09-05 22:35 Caroline Tice
2013-09-06 17:40 ` [C++ PATCH] " Paolo Carlini
2013-09-07 16:53 ` [PATCH] " Jason Merrill
0 siblings, 2 replies; 4+ messages in thread
From: Caroline Tice @ 2013-09-05 22:35 UTC (permalink / raw)
To: GCC Patches
[-- Attachment #1: Type: text/plain, Size: 966 bytes --]
This fixes a bug where using -fvtable-verify=preinit sometimes causes
an ICE. In particular, when the preinit flag was used, the vtable
verification constructor initialization function was being written to
the assembly file before it was being checked with
cgraph_process_new_functions. This sometimes caused an assertion
failure in decide_is_symbol_needed. This patch fixes the problem by
reordering events so that the function is written to the assembly file
after the call to cgraph_process_new_functions. I have verified that
this fixes the test case attached to the bug, and it has passed all my
regular vtable verification tests. Is this patch ok to commit?
-- Caroline Tice
cmtice@google.com
2013-09-04 Caroline Tice <cmtice@google.com>
PR c++/58300
* vtable-class-hierarchy.c (vtv_generate_init_routine): In
preinit case, move call to assemble_vtv_preinit_initializer to
after call to cgraph_process_new_functions.
[-- Attachment #2: bug-58300.patch --]
[-- Type: application/octet-stream, Size: 873 bytes --]
Index: gcc/cp/vtable-class-hierarchy.c
===================================================================
--- gcc/cp/vtable-class-hierarchy.c (revision 202296)
+++ gcc/cp/vtable-class-hierarchy.c (working copy)
@@ -1179,15 +1179,16 @@ vtv_generate_init_routine (void)
TREE_USED (vtv_fndecl) = 1;
DECL_PRESERVE_P (vtv_fndecl) = 1;
if (flag_vtable_verify == VTV_PREINIT_PRIORITY)
- {
- DECL_STATIC_CONSTRUCTOR (vtv_fndecl) = 0;
- assemble_vtv_preinit_initializer (vtv_fndecl);
- }
+ DECL_STATIC_CONSTRUCTOR (vtv_fndecl) = 0;
gimplify_function_tree (vtv_fndecl);
cgraph_add_new_function (vtv_fndecl, false);
cgraph_process_new_functions ();
+
+ if (flag_vtable_verify == VTV_PREINIT_PRIORITY)
+ assemble_vtv_preinit_initializer (vtv_fndecl);
+
}
pop_lang_context ();
}
^ permalink raw reply [flat|nested] 4+ messages in thread* [C++ PATCH] Fix PR58300, issue with -fvtable-verify=preinit
2013-09-05 22:35 [PATCH] Fix PR58300, issue with -fvtable-verify=preinit Caroline Tice
@ 2013-09-06 17:40 ` Paolo Carlini
2013-09-07 16:53 ` [PATCH] " Jason Merrill
1 sibling, 0 replies; 4+ messages in thread
From: Paolo Carlini @ 2013-09-06 17:40 UTC (permalink / raw)
To: Caroline Tice; +Cc: GCC Patches, Jason Merrill
Hi,
On 09/06/2013 12:35 AM, Caroline Tice wrote:
> This fixes a bug where using -fvtable-verify=preinit sometimes causes
> an ICE. In particular, when the preinit flag was used, the vtable
> verification constructor initialization function was being written to
> the assembly file before it was being checked with
> cgraph_process_new_functions. This sometimes caused an assertion
> failure in decide_is_symbol_needed. This patch fixes the problem by
> reordering events so that the function is written to the assembly file
> after the call to cgraph_process_new_functions. I have verified that
> this fixes the test case attached to the bug, and it has passed all my
> regular vtable verification tests. Is this patch ok to commit?
>
> -- Caroline Tice
> cmtice@google.com
>
>
> 2013-09-04 Caroline Tice <cmtice@google.com>
>
> PR c++/58300
> * vtable-class-hierarchy.c (vtv_generate_init_routine): In
> preinit case, move call to assemble_vtv_preinit_initializer to
> after call to cgraph_process_new_functions.
Thanks Caroline. Let's add Jason in CC, I almost missed the patch myself
(and I was actively paying attention to the issue)
Paolo.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] Fix PR58300, issue with -fvtable-verify=preinit
2013-09-05 22:35 [PATCH] Fix PR58300, issue with -fvtable-verify=preinit Caroline Tice
2013-09-06 17:40 ` [C++ PATCH] " Paolo Carlini
@ 2013-09-07 16:53 ` Jason Merrill
2013-09-07 16:54 ` Jason Merrill
1 sibling, 1 reply; 4+ messages in thread
From: Jason Merrill @ 2013-09-07 16:53 UTC (permalink / raw)
To: Caroline Tice, GCC Patches
OK.
Jason
^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-09-05 22:35 [PATCH] Fix PR58300, issue with -fvtable-verify=preinit Caroline Tice
2013-09-06 17:40 ` [C++ PATCH] " Paolo Carlini
2013-09-07 16:53 ` [PATCH] " Jason Merrill
2013-09-07 16:54 ` Jason Merrill
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