[Bug sanitizer/81530] New: [8 Regression] ICE in add_stmt in gcc/cp/semantics.c:387

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81530

            Bug ID: 81530
           Summary: [8 Regression] ICE in add_stmt in
                    gcc/cp/semantics.c:387
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
  Target Milestone: ---

After mine commit r249158, we ICE on:

$ cat /tmp/tmplyzssimb.ii
int a[(long) 4e20];

$ g++ -fsanitize=undefined /tmp/tmplyzssimb.ii
/tmp/tmplyzssimb.ii:1:18: error: overflow in constant expression
 int a[(long) 4e20];
                  ^
/tmp/tmplyzssimb.ii:1:18: internal compiler error: Segmentation fault
0xda25cf crash_signal
        ../../gcc/toplev.c:338
0x80cb87 add_stmt(tree_node*)
        ../../gcc/cp/semantics.c:387
0x6ba232 compute_array_index_type(tree_node*, tree_node*, int)
        ../../gcc/cp/decl.c:9511
0x6bdd8e create_array_type_for_decl
        ../../gcc/cp/decl.c:9634
0x6bdd8e grokdeclarator(cp_declarator const*, cp_decl_specifier_seq*,
decl_context, int, tree_node**)
        ../../gcc/cp/decl.c:10808
0x6c1ee6 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        ../../gcc/cp/decl.c:4903
0x77ce47 cp_parser_init_declarator
        ../../gcc/cp/parser.c:19428
0x78445c cp_parser_simple_declaration
        ../../gcc/cp/parser.c:12951
0x785355 cp_parser_block_declaration
        ../../gcc/cp/parser.c:12776
0x789f94 cp_parser_declaration
        ../../gcc/cp/parser.c:12674
0x78a3db cp_parser_declaration_seq_opt
        ../../gcc/cp/parser.c:12550
0x78a6ea cp_parser_translation_unit
        ../../gcc/cp/parser.c:4386
0x78a6ea c_parse_file()
        ../../gcc/cp/parser.c:38644
0x8cf8d6 c_common_parse_file()
        ../../gcc/c-family/c-opts.c:1104