https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66496
Bug ID: 66496
Summary: Static hash_map causes segfault in static constructor
of the compiler compilation unit
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: jamborm at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-linux-gnu
Target: x86_64-linux-gnu
If you define a static (non-pointer) hash_map in any gcc *.c source
code file, for example like this:
--- a/gcc/ipa-cp.c
+++ b/gcc/ipa-cp.c
@@ -139,6 +139,8 @@ along with GCC; see the file COPYING3. If not see
#include "ipa-inline.h"
#include "ipa-utils.h"
+static hash_map <tree, uint32_t> some_hash_map;
+
template <typename valtype> class ipcp_value;
/* Describes a particular source for an IPA-CP value. */
ligcc will not compile, because the compiler crashes even when
compiling an empty main function. Specifically, it segfaults in the
static constructor of the unit where you defined the hash_map:
(gdb) bt
#0 hash_table<hash_map<mem_location*, mem_usage*,
mem_alloc_description<mem_usage>::mem_alloc_hashmap_traits>::hash_entry,
xcallocator>::find_with_hash (this=this@entry=0x0,
comparable=@0x7fffffffe000: 0x1bdc090, hash=2852224967)
at /home/mjambor/gcc/small/src/gcc/hash-table.h:1012
#1 0x00000000009f5931 in get (k=@0x7fffffffe000: 0x1bdc090, this=0x0)
at /home/mjambor/gcc/small/src/gcc/hash-map.h:148
#2 register_descriptor (location=0x1bdc090, ptr=0x1bc4020 <some_hash_map>,
this=<optimized out>)
at /home/mjambor/gcc/small/src/gcc/mem-stats.h:391
#3 register_descriptor (function=0x0, line=0, filename=0x0, ggc=<optimized
out>,
origin=<optimized out>, ptr=0x1bc4020 <some_hash_map>, this=<optimized
out>)
at /home/mjambor/gcc/small/src/gcc/mem-stats.h:425
#4 hash_table<hash_map<tree_node*, unsigned int,
default_hashmap_traits>::hash_entry, xcallocator>::hash_table (this=0x1bc4020
<some_hash_map>, size=13, ggc=<optimized out>,
gather_mem_stats=<optimized out>, origin=<optimized out>)
at /home/mjambor/gcc/small/src/gcc/hash-table.h:798
#5 0x0000000000598470 in hash_map (gather_mem_stats=true, ggc=false, n=13,
this=0x1bc4020 <some_hash_map>) at
/home/mjambor/gcc/small/src/gcc/hash-map.h:117
#6 __static_initialization_and_destruction_0 (__initialize_p=1,
__priority=65535)
at /home/mjambor/gcc/small/src/gcc/ipa-cp.c:142
#7 _GLOBAL__sub_I_ipcp_cst_values_pool () at
/home/mjambor/gcc/small/src/gcc/ipa-cp.c:4600
#8 0x00000000012263ed in __libc_csu_init (argc=2, argv=0x7fffffffe198,
envp=0x7fffffffe1b0)
at elf-init.c:88
#9 0x00007ffff6e4da95 in __libc_start_main () from /lib64/libc.so.6
#10 0x00000000005989d7 in _start () at ../sysdeps/x86_64/start.S:122
I know that use of static hash_maps is unlikely to be a good idea, but
it still should not crash.
