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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_decl.ludic
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@ -90,13 +90,13 @@ fn emit_program() -> void {
fn ir_flush(path: ptr) -> bool {
let h = buf_str(head)
let c = buf_str(code)
if ptr_is_null(path) {
if (path == null) {
print_str(h)
print_str(c)
return true
}
let f = file_open(path, "wb")
if ptr_is_null(f) { return false }
if (f == null) { return false }
file_write(f, h, slen(h))
file_write(f, c, slen(c))
file_close(f)