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strconv: graduate to (T | invalid | overflow); add void expression

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`type invalid = i32` (payload: byte index of first bad rune; mirrors
Hare's strconv::invalid = !size) and `type overflow = void` (Hare's
overflow = !void). stoi64/stou64 now return these instead of the
str-error placeholder. atoi64 dropped — lib/CLAUDE.md says graduate
in one go, don't keep both shapes around.

To produce the void variant payload, `void` is now a real
expression literal (TK_VOID kw, N_VOIDLIT). It evaluates to ty_void;
codegen emits MOVQ $0, AX. Both kinds are appended at the tail of
their enums to keep prior numeric values byte-stable for the
wwdump-diff fixtures.

check_file reorder: USE declarations are now installed in pass 1
alongside the type-decl placeholders so dotted type references
(`strconv.invalid` from a typedecl body) resolve. DEF/FN/LET silently
overwrite a USE-occupied slot — matches the old behavior where USE
silently no-op'd when a same-name fn/def existed (the conflict
manifested in selfhost main.combined.ww at `use parse;` colliding
with `export fn parse(a)`).

selfhost mirror: lib/ww/lex/tok.ww kwtab+name; lib/ww/ast.ww
N_VOIDLIT def+print; lib/ww/parse/{expr,parse}.ww TK_VOID handling;
selfhost/cmd/wcc/cgenexpr.ww N_VOIDLIT codegen.
This commit is contained in:
Hojun-Cho
2026-05-12 02:02:08 +09:00
parent 1e2f55aed8
commit 4085742853
16 changed files with 250 additions and 198 deletions
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11
cmd/wcc/parse.c
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@@ -222,6 +222,16 @@ parsetype(Parser *p)
n->lhs = parsetype(p);
return n;
}
case TK_VOID: {
/* `void` keyword in type-expr context. Synthesise an
* N_TNAME so type-resolution treats it like any other
* primitive name. */
Node *n = newnode(p->a, N_TNAME, pp);
n->str = "void";
n->strlen = 4;
advance(p);
return n;
}
case TK_IDENT: {
Node *n = newnode(p->a, N_TNAME, pp);
n->str = p->cur.text;
@@ -455,6 +465,7 @@ parseprimary(Parser *p)
case TK_TRUE: advance(p); return newnode(p->a, N_TRUE, pp);
case TK_FALSE: advance(p); return newnode(p->a, N_FALSE, pp);
case TK_NIL: advance(p); return newnode(p->a, N_NIL, pp);
case TK_VOID: advance(p); return newnode(p->a, N_VOIDLIT, pp);
case TK_UNDER: {
/* Bare `_` — valid only as a discard lvalue. We yield an N_IDENT
* with empty str; the checker rejects it outside assignment