https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70700
Bug ID: 70700
Summary: ICE using -fdump-tree-all-graph option
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: trivial
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
Reported by t.w. lefering by email:
------------------------------------------------------------
Using GCC snapshot gcc-6-20160410.tar.bz2 and the
-fdump-tree-all-graph option to generate graph data
internal gcc error happens when compiling Linux sparse:
parse.c:1362:22: internal compiler error: in operator[], at vec.h:714
in tree-ssa-structalias.c line 1212 is build_pred_graph()
at line 1229 the get_varinfo() using vec.h routines hits the internal compiler
error:
for (j = 1; j < FIRST_REF_NODE; j++)
{
if (!get_varinfo (j)->is_special_var)
bitmap_set_bit (graph->direct_nodes, j);
}
Looks like the variable j gets out-of-range then hit this assert in vec.h:714
in vec.h:
template<typename T, typename A>
inline T &
vec<T, A, vl_embed>::operator[] (unsigned ix)
{
gcc_checking_assert (ix < m_vecpfx.m_num);
return m_vecdata[ix];
}
And this is in the generated output:
parse.c: In function 'const_qualifier':
parse.c:1362:22: internal compiler error: in operator[], at vec.h:714
static struct token *const_qualifier(struct token *next, struct decl_state
*ctx)
^~~~~~~~~~~~~~~
0xce89e7 vec<variable_info*, va_heap, vl_embed>::operator[](unsigned int)
../.././gcc/vec.h:714
0xce89e7 vec<variable_info*, va_heap, vl_ptr>::operator[](unsigned int)
../.././gcc/vec.h:1180
0xce89e7 get_varinfo
../.././gcc/tree-ssa-structalias.c:333
0xcf7cd7 get_varinfo
../.././gcc/vec.h:714
0xcf7cd7 build_pred_graph
../.././gcc/tree-ssa-structalias.c:1231
0xcf7cd7 solve_constraints
../.././gcc/tree-ssa-structalias.c:6961
0xcf9593 compute_points_to_sets
../.././gcc/tree-ssa-structalias.c:7062
0xcf9593 compute_may_aliases()
../.././gcc/tree-ssa-structalias.c:7389
0xa5afdc execute_function_todo
../.././gcc/passes.c:1930
0xa5baab execute_todo
../.././gcc/passes.c:2010
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.
------------------------------------------------------------
