https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68446
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Hi David.
Removal of lazy initialization:
diff --git a/gcc/opts.c b/gcc/opts.c
index 2add158..cc96150 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -273,7 +273,7 @@ init_opts_obstack (void)
{
static bool opts_obstack_initialized = false;
- if (!opts_obstack_initialized)
+// if (!opts_obstack_initialized)
{
opts_obstack_initialized = true;
gcc_obstack_init (&opts_obstack);
Introduces back the memory leak that was removed in r230264:
$ valgrind --leak-check=yes --trace-children=yes ./xgcc -B. -c
/home/marxin/Programming/gcc3/gcc/testsuite/g++.dg/ext/mv1.C -O2 -fPIC
==24974== 1,245,184 bytes in 19 blocks are definitely lost in loss record 922
of 924
==24974== at 0x4C2A00F: malloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24974== by 0x1B32A77: xmalloc (xmalloc.c:148)
==24974== by 0xAE53CA: memory_block_pool::allocate() (memory-block.h:56)
==24974== by 0x1AE7465: mempool_obstack_chunk_alloc(unsigned long)
(memory-block.cc:49)
==24974== by 0x1B31B37: _obstack_begin_worker (obstack.c:141)
==24974== by 0x1AC7341: init_opts_obstack() (opts.c:279)
==24974== by 0x1AC7362: init_options_struct(gcc_options*, gcc_options*)
(opts.c:290)
==24974== by 0x145F196: ix86_valid_target_attribute_p(tree_node*,
tree_node*, tree_node*, int) (i386.c:6253)
==24974== by 0xACAD03: handle_target_attribute(tree_node**, tree_node*,
tree_node*, int, bool*) (c-common.c:9421)
==24974== by 0xA8D645: decl_attributes(tree_node**, tree_node*, int)
(attribs.c:548)
==24974== by 0x8D6CDE: cplus_decl_attributes(tree_node**, tree_node*, int)
(decl2.c:1490)
==24974== by 0x7EB0CB: grokfndecl(tree_node*, tree_node*, tree_node*,
tree_node*, tree_node*, tree_node*, int, overload_flags, int, cp_ref_qualifier,
tree_node*, int, int, int, int, bool, special_function_kind, bool, int,
tree_node*, tree_node**, unsigned int) (decl.c:8152)
Using trunk with the patch you suggest, I see invalid write operation by
valgrind (same command line):
==27543== Invalid write of size 8
==27543== at 0x4C2C7DF: memset (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==27543== by 0xAE54D6: memory_block_pool::release(void*) (memory-block.h:70)
==27543== by 0xAE5696: base_pool_allocator<memory_block_pool>::release()
(alloc-pool.h:302)
==27543== by 0xC97CAE:
base_pool_allocator<memory_block_pool>::release_if_empty() (alloc-pool.h:325)
==27543== by 0xC97C61: object_allocator<et_occ>::release_if_empty()
(alloc-pool.h:477)
==27543== by 0xC97404: et_free_pools (et-forest.c:509)
==27543== by 0xC191D1: free_dominance_info(function*, cdi_direction)
(dominance.c:686)
==27543== by 0xC19223: free_dominance_info(cdi_direction) (dominance.c:696)
==27543== by 0xF935CB: execute_pass_list(function*, opt_pass*)
(passes.c:2424)
==27543== by 0xBC7FAB: cgraph_node::analyze() (cgraphunit.c:636)
==27543== by 0xBC9716: analyze_functions(bool) (cgraphunit.c:1080)
==27543== by 0xBCDCD8: symbol_table::finalize_compilation_unit()
(cgraphunit.c:2531)
==27543== Address 0x72f15d0 is 16 bytes inside a block of size 65,536 alloc'd
==27543== at 0x4C2A00F: malloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==27543== by 0x1B32AA7: xmalloc (xmalloc.c:148)
==27543== by 0xAE53CA: memory_block_pool::allocate() (memory-block.h:56)
==27543== by 0xAE576A: base_pool_allocator<memory_block_pool>::allocate()
(alloc-pool.h:365)
==27543== by 0xC97BC5: object_allocator<et_occ>::allocate()
(alloc-pool.h:486)
==27543== by 0xC97259: et_new_occ(et_node*) (et-forest.c:445)
==27543== by 0xC97315: et_new_tree (et-forest.c:472)
==27543== by 0xC18FEF: calculate_dominance_info(cdi_direction)
(dominance.c:647)
==27543== by 0x1109047: cleanup_tree_cfg_noloop() (tree-cfgcleanup.c:753)
==27543== by 0x110915B: cleanup_tree_cfg() (tree-cfgcleanup.c:812)
==27543== by 0x10EB907: execute_build_cfg() (tree-cfg.c:360)
==27543== by 0x10EB966: (anonymous
namespace)::pass_build_cfg::execute(function*) (tree-cfg.c:389)
Martin
