ludic/selfhost/ast.ludic
Orkuncakilkaya 70ab79a4e9 Phase 7b: null literal + x == null (retire ptr_null/ptr_is_null)
`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>
2026-08-28 00:50:21 +03:00

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# ast.ludic — the node kinds and the single Node shape they share, plus the
# declaration tables the emitter reads. Mirrors compiler/front/ast.h + sem/.
# declarations
const N_STRUCT: int = 0
const N_FIELD: int = 1
const N_VAR: int = 2
const N_CONST: int = 3
const N_FN: int = 4
const N_PARAM: int = 5
const N_MAIN: int = 6
const N_BLOCK: int = 7
const N_COMP: int = 8
const N_SYS: int = 9
const N_ARCH: int = 10
const N_EXTERN: int = 11
const N_UI: int = 12
const N_ENUM: int = 27 # enum Name { A, B, ... } — named int constants
const S_TOGGLE: int = 28 # enable/disable (ival: 1=enable 0=disable; s=target; a=entity or null)
# statements
const S_LET: int = 10
const S_ASSIGN: int = 11
const S_IF: int = 12
const S_WHILE: int = 13
const S_FOR: int = 14
const S_RETURN: int = 15
const S_EXPR: int = 16
const S_BREAK: int = 17
const S_CONTINUE: int = 18
const S_MATCH: int = 19
const S_MARM: int = 20
const S_QUERY: int = 21
const S_SPAWN: int = 22
const S_DESPAWN: int = 23
const S_MACHINE: int = 24
const S_STATE: int = 25
const S_BECOME: int = 26
# expressions
const E_INT: int = 30
const E_STR: int = 31
const E_BOOL: int = 32
const E_ID: int = 33
const E_CALL: int = 34
const E_MEMBER: int = 35
const E_INDEX: int = 36
const E_BIN: int = 37
const E_UN: int = 38
const E_NEW: int = 39
const E_FLOAT: int = 40
const E_REC: int = 41
const E_FINIT: int = 42
const E_NULL: int = 43 # the `null` pointer literal
property Node {
kind: int = 0
s: ptr = null # name / operator / string / type-of-new
ival: int = 0 # int literal, bool, flags
ty: ptr = null # declared type (let/param/field/fn/var/const)
a: Node # fixed children (meaning per kind)
b: Node
c: Node
kids: []Node # variadic children
line: int = 0
}
fn node(kind: int) -> Node {
let n = new Node
n.kind = kind
n.kids = new []Node
return n
}