[Bug ipa/65059] New: [5 Regression] Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360

[Bug ipa/65059] New: [5 Regression] Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65059

            Bug ID: 65059
           Summary: [5 Regression] Chrome LTO: lto1: internal compiler
                    error: in ipa_comdats, at ipa-comdats.c:360
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org

Latest GCC produces ICE in:

lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360
0xe58435 ipa_comdats
    ../../gcc/ipa-comdats.c:360
0xe585be execute
    ../../gcc/ipa-comdats.c:414

Problematic symbol:
_ZThn8_NK12_GLOBAL__N_116PanelStackWindow9GetWidgetEv/94300622
(_ZThn8_NK12_GLOBAL__N_116PanelStackWindow9GetWidgetEv) @0x7f557e1927a8
  Type: function definition analyzed
  Visibility: prevailing_def_ironly virtual artificial
  References: 
  Referring: 
  Read from file:
obj/chrome/browser/ui/views/panels/browser_ui.panel_stack_view.o
  Availability: available
  First run: 0
  Function flags:
  Thunk fixed offset -8 virtual value 0 has virtual offset 0)
  Called by: 
  Calls: *.LTHUNK22/94300621 (1.00 per call) 

If I see ipa-devirt correctly, this symbol should be probably removed as dead
as it has no calls, am I right? How could I debug if the symbol is considered
to be removed?

Thanks,
Martin

[Bug ipa/65059] [5 Regression] Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65059

--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Does the following help?
Index: ipa-comdats.c
===================================================================
--- ipa-comdats.c       (revision 220606)
+++ ipa-comdats.c       (working copy)
@@ -328,9 +328,14 @@ ipa_comdats (void)

   FOR_EACH_DEFINED_SYMBOL (symbol)
     {
+      struct cgraph_node *fun;
       symbol->aux = NULL; 
       if (!symbol->get_comdat_group ()
          && !symbol->alias
+         /* Thunks to external functions do not need to be categorized.  */
+         && (!(fun = dyn_cast <cgraph_node *> (symbol))
+             || !fun->thunk.thunk_p
+             || fun->function_symbol ()->definition)
          && symbol->real_symbol_p ())
        {
          tree *val = map.get (symbol);

[Bug ipa/65059] [5 Regression] Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65059

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Thank you Honza, patch works for.

Martin
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Subject: [Bug c++/65072] Segfault when parsing dectlype in trailing return type
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65072

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|Archlinux Kernel 3.16.3,    |
                   |Intel x86_64                |
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-02-15
                 CC|                            |trippels at gcc dot gnu.org
               Host|Archlinux Kernel 3.16.3,    |
                   |Intel x86_64                |
     Ever confirmed|0                           |1

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Attached testcase only crashes with gcc-4.8 and gcc-4.9.
Reduced testcase crashes with all supported versions:

markus@x4 testc % cat main.ii
template <typename> class CMatrix44
{
  struct
  {
    int xx;
  };
  auto operator*(const CMatrix44 m) -> CMatrix44<decltype (m.xx)>;
};
using CMatrix44f = CMatrix44<float>;
void fn1 (const CMatrix44<float>);
CMatrix44f a;

markus@x4 testc % /g++ -c -std=c++11 main.ii
main.ii: In instantiation of ‘class CMatrix44<float>’:
main.ii:12:12:   required from here
main.ii:7:8: internal compiler error: Segmentation fault
   auto operator*(const CMatrix44 m) -> CMatrix44<decltype (m.xx)>;
        ^
0xca24ff crash_signal
        ../../gcc/gcc/toplev.c:383
0x75a4e0 build_class_member_access_expr(tree_node*, tree_node*, tree_node*,
bool, int)
        ../../gcc/gcc/cp/typeck.c:2319
0x75a8d6 build_class_member_access_expr(tree_node*, tree_node*, tree_node*,
bool, int)
        ../../gcc/gcc/cp/typeck.c:2409
0x75b19b finish_class_member_access_expr(tree_node*, tree_node*, bool, int)
        ../../gcc/gcc/cp/typeck.c:2813
0x6713f0 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        ../../gcc/gcc/cp/pt.c:15446
0x675276 tsubst(tree_node*, tree_node*, int, tree_node*)
        ../../gcc/gcc/cp/pt.c:12530
0x68bb1a tsubst_template_args
        ../../gcc/gcc/cp/pt.c:10257
0x6833c0 tsubst_aggr_type
        ../../gcc/gcc/cp/pt.c:10454
0x6757db tsubst(tree_node*, tree_node*, int, tree_node*)
        ../../gcc/gcc/cp/pt.c:11909
0x68a598 tsubst_function_type
        ../../gcc/gcc/cp/pt.c:11614
0x675916 tsubst(tree_node*, tree_node*, int, tree_node*)
        ../../gcc/gcc/cp/pt.c:12357
0x6838de tsubst_decl
        ../../gcc/gcc/cp/pt.c:10845
0x675d36 tsubst(tree_node*, tree_node*, int, tree_node*)
        ../../gcc/gcc/cp/pt.c:11830
0x6a8900 instantiate_class_template_1
        ../../gcc/gcc/cp/pt.c:9374
0x6a8900 instantiate_class_template(tree_node*)
        ../../gcc/gcc/cp/pt.c:9688
0x73f56b complete_type(tree_node*)
        ../../gcc/gcc/cp/typeck.c:146
0x6222b7 start_decl_1(tree_node*, bool)
        ../../gcc/gcc/cp/decl.c:4898
0x641167 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        ../../gcc/gcc/cp/decl.c:4861
0x72cde5 cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:17153
0x72ebbc cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11592
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
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Subject: [Bug middle-end/53623] [4.7/4.8 Regression] sign extension is effectively split into two x86-64 instructions
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idS623

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEW

--- Comment #15 from H.J. Lu <hjl.tools at gmail dot com> ---
A patch for 4.8 branch is posted at

https://gcc.gnu.org/ml/gcc-patches/2015-02/msg00923.html

[Bug ipa/65059] [5 Regression] Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65059

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
   Target Milestone|---                         |5.0

[Bug ipa/65059] [5 Regression] Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65059

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Mon Feb 16 12:28:40 2015
New Revision: 220733

URL: https://gcc.gnu.org/viewcvs?rev=220733&root=gcc&view=rev
Log:
Fix PR ipa/65059.

    PR ipa/65059
    * ipa-comdats.c (ipa_comdats): Do not categorize thunks to
    external functions.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ipa-comdats.c
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide064

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING

--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Andreas Schwab from comment #9)
> before:
>     2170:       02 38 01 02 00 24       [MII]       addl r39=0,r1
>                         2170: GPREL22   .sdata+0x38
>
> after:
>     2170:       02 38 01 02 00 24       [MII]       addl r39=0,r1
>                         2170: GPREL22   .rodata+0x114

Can you provide a prepossessed Ada source file?

[Bug ipa/65059] [5 Regression] Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65059

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
So fixed?

[Bug ipa/65059] [5 Regression] Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65059

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed in 5.0.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idH009

David Edelsohn <dje at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |5.0

--- Comment #13 from David Edelsohn <dje at gcc dot gnu.org> ---
Fixed.