[Bug c++/54647] New: Segmentation fault in get_expr_value_id with -O2

[dcb314 at hotmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54647



             Bug #: 54647

           Summary: Segmentation fault in get_expr_value_id with -O2

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: c++

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: dcb...@hotmail.com





Created attachment 28240

  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28240

C++ source code



I just tried to compile the package kdelibs3-3.5.10-39

on gcc-4.8 trunk dated 20120919 on an AMD x86_64 box.



The compiler said



render_table.cpp: In member function 'void khtml::RenderTable::splitColumn(int,

int)':

render_table.cpp:563:6: internal compiler error: Segmentation fault

 void RenderTable::splitColumn( int pos, int firstSpan )

      ^

Please submit a full bug report,

with preprocessed source if appropriate.

See <http://gcc.gnu.org/bugs.html> for instructions.



Here is valgrind helping out with a stack backtrace



==27576== Invalid read of size 4

==27576==    at 0xB5BAC8: get_expr_value_id(pre_expr_d*) (tree-ssa-pre.c:615)

==27576==    by 0xB6346A: find_or_generate_expression(basic_block_def*,

pre_expr_d*, gimple_statement_d**, gimple_statement_d*) [clone .constprop.104]

(tree-ssa-pre.c:2894)

==27576==    by 0xB60282: create_expression_by_pieces(basic_block_def*,

pre_expr_d*, gimple_statement_d**, gimple_statement_d*, tree_node*) [clone

.constprop.103] (tree-ssa-pre.c:2995)

==27576==    by 0xB606FD: insert_into_preds_of_block(basic_block_def*, unsigned

int, vec_t<pre_expr_d*>*) (tree-ssa-pre.c:3234)

==27576==    by 0xB61743: insert_aux(basic_block_def*) (tree-ssa-pre.c:3524)

==27576==    by 0xB61127: insert_aux(basic_block_def*) (tree-ssa-pre.c:3749)

==27576==    by 0xB61127: insert_aux(basic_block_def*) (tree-ssa-pre.c:3749)

==27576==    by 0xB61127: insert_aux(basic_block_def*) (tree-ssa-pre.c:3749)

==27576==    by 0xB61127: insert_aux(basic_block_def*) (tree-ssa-pre.c:3749)

==27576==    by 0xB61127: insert_aux(basic_block_def*) (tree-ssa-pre.c:3749)

==27576==    by 0xB61127: insert_aux(basic_block_def*) (tree-ssa-pre.c:3749)

==27576==    by 0xB61127: insert_aux(basic_block_def*) (tree-ssa-pre.c:3749)

==27576==  Address 0x0 is not stack'd, malloc'd or (recently) free'd

==27576==



Preprocessed source code attached. Flag -O2 required.