[Bug c/49096] New: internal compiler error: in calc_dfs_tree, at dominance.c:394

[dietwo at hotmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49096

           Summary: internal compiler error: in calc_dfs_tree, at
                    dominance.c:394
           Product: gcc
           Version: 4.5.3
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dietwo@hotmail.com


Created attachment 24316
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24316
save-temps file

A plugin containing two passes (one pass after "ch" and the second one after
"loop2_init). Purpose is just to get the number of loops by calling
number_of_loops function. Works fine and produces output if the called function
is not returning a value, but if there is a return value then it produces the
following error.
internal compiler error: in calc_dfs_tree, at dominance.c:394

Tested with 4.5.0, 4.5.2, 4.5.3 and 4.6.0

Command line: ~/compilers/gcc-4.5.3/install/bin/gcc -O3 -fplugin=./plugin.so
hello.c

(gdb) bt
#0  fancy_abort (file=0xd11258 "../../../gcc/dominance.c", line=394,
function=0xd113e0 "calc_dfs_tree") at ../../../gcc/diagnostic.c:762
#1  0x00000000005b37b7 in calc_dfs_tree (di=0x7fffffffdac0, reverse=0 '\000')
at ../../../gcc/dominance.c:394
#2  0x00000000005b5158 in calculate_dominance_info (dir=CDI_DOMINATORS) at
../../../gcc/dominance.c:655
#3  0x000000000057a23b in flow_loops_find (loops=0x7ffff5816240) at
../../../gcc/cfgloop.c:387
#4  0x00000000006eb93f in loop_optimizer_init (flags=7) at
../../../gcc/loop-init.c:52
#5  0x00007ffff589c8bc in execute_rtl () at new.c:31
#6  0x000000000072868b in execute_one_pass (pass=0x7ffff5a9d100) at
../../../gcc/passes.c:1568
#7  0x0000000000728915 in execute_pass_list (pass=0x7ffff5a9d100) at
../../../gcc/passes.c:1623
#8  0x0000000000819ac5 in tree_rest_of_compilation (fndecl=0x7ffff580cf00) at
../../../gcc/tree-optimize.c:413
#9  0x00000000009a0311 in cgraph_expand_function (node=0x7ffff5812750) at
../../../gcc/cgraphunit.c:1555
#10 0x00000000009a2b95 in cgraph_expand_all_functions () at
../../../gcc/cgraphunit.c:1634
#11 cgraph_optimize () at ../../../gcc/cgraphunit.c:1890
#12 0x00000000009a32f5 in cgraph_finalize_compilation_unit () at
../../../gcc/cgraphunit.c:1103
#13 0x00000000004b1083 in c_write_global_declarations () at
../../../gcc/c-decl.c:9520
#14 0x00000000007c8cd5 in compile_file (argc=4, argv=0x7fffffffdeb8) at
../../../gcc/toplev.c:1065
#15 do_compile (argc=4, argv=0x7fffffffdeb8) at ../../../gcc/toplev.c:2417
#16 toplev_main (argc=4, argv=0x7fffffffdeb8) at ../../../gcc/toplev.c:2459
#17 0x00007ffff6437bfd in __libc_start_main () from /lib64/libc.so.6
#18 0x0000000000494f59 in _start () at ../sysdeps/x86_64/elf/start.S:113