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vm.c: generalize pre-dispatch argument count check for C methods

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Replace check_method_noarg() with check_argument_count() that validates
min <= argc <= max using the full aspec stored in mrb_method_t.flags.
This catches ArgumentError earlier at dispatch time, before entering
the C function.

The old check only handled the special case of aspec==0 (NOARG).
The new check extracts REQ, OPT, REST, POST, KEY, and KDICT from
the aspec and validates accordingly. Keyword hash is counted as
a positional arg only when the method doesn't accept keywords.

Remove MRB_METHOD_NOARG_P macro from proc.h (subsumed by aspec check).
Fix 15 incorrect aspec declarations across the codebase that were
exposed by the stricter enforcement.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-02-20 14:25:48 +09:00
parent 4a097525df
commit b460554d33
14 changed files with 42 additions and 39 deletions
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src/string.c
+1 -1
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@@ -3529,7 +3529,7 @@ static const mrb_mt_entry string_rom_entries[] = {
MRB_MT_ENTRY(mrb_str_hash_m, MRB_SYM(hash), MRB_ARGS_NONE()), /* 15.2.10.5.20 */
MRB_MT_ENTRY(mrb_str_include, MRB_SYM_Q(include), MRB_ARGS_REQ(1)), /* 15.2.10.5.21 */
MRB_MT_ENTRY(mrb_str_index_m, MRB_SYM(index), MRB_ARGS_ARG(1,1)), /* 15.2.10.5.22 */
MRB_MT_ENTRY(mrb_str_init, MRB_SYM(initialize), MRB_ARGS_REQ(1) | MRB_MT_PRIVATE), /* 15.2.10.5.23 */
MRB_MT_ENTRY(mrb_str_init, MRB_SYM(initialize), MRB_ARGS_OPT(1) | MRB_MT_PRIVATE), /* 15.2.10.5.23 */
MRB_MT_ENTRY(mrb_str_replace, MRB_SYM(initialize_copy), MRB_ARGS_REQ(1) | MRB_MT_PRIVATE), /* 15.2.10.5.24 */
MRB_MT_ENTRY(mrb_str_intern, MRB_SYM(intern), MRB_ARGS_NONE()), /* 15.2.10.5.25 */
MRB_MT_ENTRY(mrb_str_size, MRB_SYM(length), MRB_ARGS_NONE()), /* 15.2.10.5.26 */