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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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7
lib/ww/lex/tok.ww
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@@ -108,9 +108,10 @@ def TK_FATARROW: i32 = 81;
// Appended at the tail (not grouped with the keyword block) so every
// pre-existing TK_* value stays unchanged — the 990_selfhost test
// diffs wwdump output against the C side, byte for byte.
def TK_IS: i32 = 82;
def TK_IS: i32 = 82;
def TK_VOID: i32 = 83;
def TK_LAST: i32 = 83;
def TK_LAST: i32 = 84;
// ---- Pos / Tok --------------------------------------------------------
//
@@ -181,6 +182,7 @@ export fn kwlookup(p: *u8, n: i32) i32 = {
if (streqn(p, "true", n)) { return TK_TRUE; };
if (streqn(p, "type", n)) { return TK_TYPE; };
if (streqn(p, "use", n)) { return TK_USE; };
if (streqn(p, "void", n)) { return TK_VOID; };
return TK_NONE;
};
@@ -222,6 +224,7 @@ export fn tokname(k: i32) str = {
if (k == TK_FALSE) { return "false"; };
if (k == TK_AS) { return "as"; };
if (k == TK_IS) { return "is"; };
if (k == TK_VOID) { return "void"; };
if (k == TK_STATIC) { return "static"; };
if (k == TK_MATCH) { return "match"; };
if (k == TK_CONST) { return "const"; };