[Bug tree-optimization/54345] New: jump threading leaks e->aux heap memory

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54345

             Bug #: 54345
           Summary: jump threading leaks e->aux heap memory
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: memory-hog
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: rgue...@gcc.gnu.org


valgrind shows

==30772== 64 bytes in 4 blocks are definitely lost in loss record 15,347 of
29,883
==30772==    at 0x4C29ADD: malloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==30772==    by 0xCE28C7: xmalloc (xmalloc.c:147)
==30772==    by 0x99C8E8: thread_through_all_blocks(bool)
(tree-ssa-threadupdate.c:1134)
==30772==    by 0x92BDCF: tree_ssa_dominator_optimize() (tree-ssa-dom.c:790)
==30772==    by 0x818C3A: execute_one_pass(opt_pass*) (passes.c:2157)
==30772==    by 0x818F84: execute_pass_list(opt_pass*) (passes.c:2212)
==30772==    by 0x818F96: execute_pass_list(opt_pass*) (passes.c:2213)
==30772==    by 0x68F583: expand_function(cgraph_node*) (cgraphunit.c:1609)
==30772==    by 0x6909E8: compile() (cgraphunit.c:1714)
==30772==    by 0x690F64: finalize_compilation_unit() (cgraphunit.c:2089)
==30772==    by 0x564956: cp_write_global_declarations() (decl2.c:4024)
==30772==    by 0x8AABF4: compile_file() (toplev.c:560)

that would be easily solvable by using an obstack for the allocation
of the two pointers.  That would be cheaper as well.  It's lifetime
would be thread_through_all_blocks ().