[Bug c/100532] ICE: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in useless_type_conversion_p, at gimple-expr.c:259

["cnsun at uwaterloo dot ca" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100532

--- Comment #1 from Chengnian Sun <cnsun at uwaterloo dot ca> ---
Another duplicate.


$ cat mutant.c
void *memcpy(void[], const void *, __SIZE_TYPE__);
f(x) {
  if (f)
    memcpy(x, x, x);
}

$ gcc-trunk  mutant.c
mutant.c:1:18: error: declaration of type name as array of voids
    1 | void *memcpy(void[], const void *, __SIZE_TYPE__);
      |                  ^
mutant.c:2:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
    2 | f(x) {
      | ^
mutant.c: In function ‘f’:
mutant.c:2:1: warning: type of ‘x’ defaults to ‘int’ [-Wimplicit-int]
mutant.c:4:12: error: type of formal parameter 1 is incomplete
    4 |     memcpy(x, x, x);
      |            ^
mutant.c:4:15: warning: passing argument 2 of ‘memcpy’ makes pointer from
integer without a cast [-Wint-conversion]
    4 |     memcpy(x, x, x);
      |               ^
      |               |
      |               int
mutant.c:1:22: note: expected ‘const void *’ but argument is of type ‘int’
    1 | void *memcpy(void[], const void *, __SIZE_TYPE__);
      |                      ^~~~~~~~~~~~
mutant.c:4:5: internal compiler error: tree check: expected class ‘type’, have
‘exceptional’ (error_mark) in useless_type_conversion_p, at gimple-expr.c:259
    4 |     memcpy(x, x, x);
      |     ^~~~~~
0x7bce07 tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/tree.c:8724
0x6cb4a3 tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/tree.h:3479
0x6cb4a3 useless_type_conversion_p(tree_node*, tree_node*)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimple-expr.c:259
0xc2fc77 types_compatible_p
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimple-expr.h:67
0xc2fc77 gimplify_addr_expr
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:6246
0xc25d93 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:14130
0xc34d59 gimplify_call_expr
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:3446
0xc25d73 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:14055
0xc28f6a gimplify_stmt(tree_node**, gimple**)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:6877
0xc2d4cb gimplify_cond_expr
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:4264
0xc25a77 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:14040
0xc28f6a gimplify_stmt(tree_node**, gimple**)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:6877
0xc2979e gimplify_bind_expr
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:1421
0xc259d3 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:14284
0xc28f6a gimplify_stmt(tree_node**, gimple**)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:6877
0xc2a563 gimplify_body(tree_node*, bool)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:15328
0xc2a9b1 gimplify_function_tree(tree_node*)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/gimplify.c:15482
0xa7e707 cgraph_node::analyze()
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/cgraphunit.c:670
0xa81611 analyze_functions
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/cgraphunit.c:1234
0xa820e1 symbol_table::finalize_compilation_unit()
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/cgraphunit.c:2508
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