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Phase 7b: null literal + x == null (retire ptr_null/ptr_is_null)

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`null` is now a real pointer literal and null-tests are comparisons, instead of
`ptr_null()` and `ptr_is_null(x)`:

  ptr_null()          -> null
  ptr_is_null(x)      -> (x == null)
  not ptr_is_null(x)  -> (x != null)

Mechanics: a new E_NULL primary (`null`, like true/false) lowers to the `null`
pointer; emit_bin's comparison path now picks `ptr` vs `i32` from operand type
(via llty), so `==`/`!=` work on any pointer/record/slice. The two intrinsics are
deleted.

Two reseeds: (A) add the literal + ptr comparison keeping the intrinsics; (B)
migrate all 182 call sites (compiler + runtime, via a balanced-paren script that
skips string-literal args and rewrites `not ptr_is_null` to `!= null`) and delete
the intrinsics. Node/Val/Buf/Tok field defaults now read `ptr = null`.

Vocabulary drops the two from LUDIC_INTRINSICS; `null` joins true/false as a
language constant (grammar + ludic_syntax.h). LANGUAGE.md notes the literal.
Reseeded (21664 lines); C-free fixpoint holds; goldens identical; 17/17; vocab +
doc-fences clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-08-28 00:50:21 +03:00
parent ddb1af3008
commit 70ab79a4e9
34 changed files with 5064 additions and 5124 deletions
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4
selfhost/emit_ui.ludic
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@ -17,7 +17,7 @@ fn ui_wtype(w: Node) -> int {
fn ui_prop(w: Node, key: ptr) -> Node {
var i = 0
while i < len(w.b.kids) { if streq(w.b.kids[i].s, key) { return w.b.kids[i].a }; i = i + 1 }
return ptr_null()
return null
}
fn ui_flatten(w: Node, parent: int) -> void {
let idx = len(uiw)
@ -51,7 +51,7 @@ fn ui_index_of(nm: ptr) -> int {
i = 0
while i < len(uiw) {
let idp = ui_prop(uiw[i], "id")
if not ptr_is_null(idp) { if idp.kind == E_ID and streq(idp.s, s) { return i } }
if (idp != null) { if idp.kind == E_ID and streq(idp.s, s) { return i } }
i = i + 1
}
return 0