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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
tools/ludic-tools/ludic_syntax.h
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@ -161,8 +161,6 @@ static const LBuiltin LUDIC_INTRINSICS[] = {
{"peekf","peekf(p: ptr, off: int) -> fixed","Read a fixed-point word."},
{"pokef","pokef(p: ptr, off: int, v: fixed)","Write a fixed-point word."},
{"ptr_add","ptr_add(p: ptr, off: int) -> ptr","Offset a pointer by bytes."},
{"ptr_null","ptr_null() -> ptr","The null pointer."},
{"ptr_is_null","ptr_is_null(p: ptr) -> bool","Null test."},
{"as_fixed","as_fixed(i: int) -> fixed","Reinterpret an int as fixed (no conversion)."},
{"as_int","as_int(f: fixed) -> int","Reinterpret a fixed as int (no conversion)."},
{"file_open","file_open(path: str, mode: str) -> ptr","fopen."},
@ -259,7 +257,7 @@ static void lud_lex(LLex* L, const char* src){
int len = i - s; char w[128];
if (len < (int)sizeof(w)){ memcpy(w, src + s, len); w[len] = 0; } else { w[0] = 0; }
int k = LT_ID;
if (!strcmp(w, "true") || !strcmp(w, "false")) k = LT_BOOL;
if (!strcmp(w, "true") || !strcmp(w, "false") || !strcmp(w, "null")) k = LT_BOOL;
else if (lud_in(LUDIC_TYPES, w)) k = LT_TYPE;
else if (lud_in(LUDIC_PHASES, w)) k = LT_PHASE;
else if (lud_is_keyword(w)) k = LT_KW;