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[Bug ipa/80205] New: [5/6/7 Regression] ICE in walk_ssa_copies at ipa-polymorphic-call.c:835


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80205

            Bug ID: 80205
           Summary: [5/6/7 Regression] ICE in walk_ssa_copies at
                    ipa-polymorphic-call.c:835
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: hubicka at ucw dot cz
  Target Milestone: ---

Following test-case triggers ICE:

$ cat ice.ii
class a
{
public:
  virtual ~a ();
};
class b
{
public:
  template <typename c> b (c);
  ~b () { delete d; }
  void
  operator= (b e)
  {
    b (e).f (*this);
  }
  void
  f (b &e)
  {
    a g;
    d = e.d;
    e.d = &g;
  }
  a *d;
};
void
h ()
{
  b i = int();
  void j ();
  i = j;
}

$ g++  -fnon-call-exceptions --param early-inlining-insns=100 -O2
-fdevirtualize ice.ii -c -std=c++14

ice.ii: In function ‘void h()’:
ice.ii:31:1: internal compiler error: Segmentation fault
 }
 ^
0xdf34df crash_signal
        ../../gcc/toplev.c:337
0x10a3b9d integer_zerop(tree_node const*)
        ../../gcc/tree.c:2324
0xbf9be1 walk_ssa_copies
        ../../gcc/ipa-polymorphic-call.c:835
0xbf9f34 ipa_polymorphic_call_context::ipa_polymorphic_call_context(tree_node*,
tree_node*, gimple*, tree_node**)
        ../../gcc/ipa-polymorphic-call.c:898
0xb6160a possible_polymorphic_call_targets(tree_node*, gimple*, bool*, void**)
        ../../gcc/ipa-utils.h:126
0xb5f868 gimple_fold_call
        ../../gcc/gimple-fold.c:3687
0xb5f868 fold_stmt_1
        ../../gcc/gimple-fold.c:4438
0xe690d6 fold_marked_statements
        ../../gcc/tree-inline.c:4946
0xe79134 optimize_inline_calls(tree_node*)
        ../../gcc/tree-inline.c:5026
0x1536681 early_inliner(function*)
        ../../gcc/ipa-inline.c:2721

It's caused by a PHI node created in:

#1  0x0000000000aa9fd4 in ggc_internal_alloc (size=<optimized out>,
f=<optimized out>, s=0, n=1) at ../../gcc/ggc-page.c:1390
#2  0x00000000010d60c1 in ggc_internal_alloc (s=248) at ../../gcc/ggc.h:134
#3  0x00000000010d685f in allocate_phi_node (len=4) at
../../gcc/tree-phinodes.c:117
#4  0x00000000010d6916 in make_phi_node (var=0x7ffff69ff3a8, len=0) at
../../gcc/tree-phinodes.c:174
#5  0x00000000010d6f04 in create_phi_node (var=0x7ffff69ff3a8,
bb=0x7ffff69f5d00) at ../../gcc/tree-phinodes.c:342
#6  0x000000000108d68d in copy_phis_for_bb (bb=0x7ffff69f5750,
id=0x7fffffffd550) at ../../gcc/tree-inline.c:2347
#7  0x000000000108ef4f in copy_cfg_body (id=0x7fffffffd550, count=0,
frequency_scale=10000, entry_block_map=0x7ffff686d3a8,
exit_block_map=0x7ffff69f5b60, new_entry=0x0) at ../../gcc/tree-inline.c:2796
#8  0x000000000108f7d0 in copy_body (id=0x7fffffffd550, count=0,
frequency_scale=10000, entry_block_map=0x7ffff686d3a8,
exit_block_map=0x7ffff69f5b60, new_entry=0x0) at ../../gcc/tree-inline.c:2982
#9  0x00000000010941a7 in expand_call_inline (bb=0x7ffff686d3a8,
stmt=0x7ffff69ea510, id=0x7fffffffd550) at ../../gcc/tree-inline.c:4725
#10 0x0000000001094a7b in gimple_expand_calls_inline (bb=0x7ffff686d3a8,
id=0x7fffffffd550) at ../../gcc/tree-inline.c:4870
#11 0x0000000001095002 in optimize_inline_calls (fn=0x7ffff69e6700) at
../../gcc/tree-inline.c:5010
#12 0x00000000018b5a62 in early_inliner (fun=0x7ffff69e0580) at
../../gcc/ipa-inline.c:2721

where the PHI looks as follows:

(gdb) p debug_gimple_stmt(phi)
SR.2_19 = PHI <>
$1 = void

I've got patch for that.

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