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hash-table violation in gcc/fortran/trans-decl.c


On 10/29/18 12:04 PM, Martin Liška wrote:
> 2) gfc_find_module
> 
> $ ./xgcc -B. /home/marxin/Programming/gcc/gcc/testsuite/gfortran.dg/coarray/alloc_comp_2.f90 -fcoarray=single -fchecking=3
> hash table checking failed: equal operator returns true for a pair of values with a different hash valuef951: internal compiler error: in find_slot_with_hash, at hash-table.h:905
> 0x8e5e86 hash_table<module_hasher, xcallocator>::find_slot_with_hash(char const* const&, unsigned int, insert_option)
> 	/home/marxin/Programming/gcc/gcc/hash-table.h:905
> 0x8e2c2c gfc_find_module(char const*)
> 	/home/marxin/Programming/gcc/gcc/fortran/trans-decl.c:4865
> 0x8e4f42 gfc_generate_module_vars(gfc_namespace*)
> 	/home/marxin/Programming/gcc/gcc/fortran/trans-decl.c:5475
> 0x8b8d7e gfc_generate_module_code(gfc_namespace*)
> 	/home/marxin/Programming/gcc/gcc/fortran/trans.c:2190
> 0x868427 translate_all_program_units
> 	/home/marxin/Programming/gcc/gcc/fortran/parse.c:6112
> 0x868427 gfc_parse_file()
> 	/home/marxin/Programming/gcc/gcc/fortran/parse.c:6328
> 0x8b19cb gfc_be_parse_file
> 	/home/marxin/Programming/gcc/gcc/fortran/f95-lang.c:204

This one is real issue introduced in r216127, I'll post it to corresponding mailing list
after testing:

diff --git a/gcc/fortran/trans-decl.c b/gcc/fortran/trans-decl.c
index 88f9f570725..e8da9e11d22 100644
--- a/gcc/fortran/trans-decl.c
+++ b/gcc/fortran/trans-decl.c
@@ -4825,7 +4825,7 @@ struct module_hasher : ggc_ptr_hash<module_htab_entry>
 {
   typedef const char *compare_type;
 
-  static hashval_t hash (module_htab_entry *s) { return htab_hash_string (s); }
+  static hashval_t hash (module_htab_entry *s) { return htab_hash_string (s->name); }
   static bool
   equal (module_htab_entry *a, const char *b)
   {

Martin


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