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Phase 6f: let = immutable, var = mutable (binding-only)

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Bindings now signal mutability the way Rust/Swift do, instead of `let` meaning
"local" and `var` meaning "module-level":

  - `let x = e`  -> immutable binding; a later `x = …` is a compile error
    (`cannot assign to immutable 'x' … use var`).
  - `var x = e`  -> mutable binding, at local OR module scope (position decides
    scope; the keyword decides mutability).
  - `const`      -> unchanged (compile-time).

Immutability is of the *binding*, not the object: `let n = new Node; n.kind = 1`
is fine (mutation through the reference); only rebinding `n` is rejected. The
check lives in emit_assign — a direct `name =` whose target is a `let` local
(loc_mut == 0) errors; field/index targets and `var`/param/loop bindings are
unaffected.

Delivered as three reseeds so the self-hosting compiler never had to compile
source its own rules would reject:
  A) add `var` as a local statement + per-local mutability tracking (loc_mut),
     no enforcement;
  B) migrate every reassigned `let` -> `var` across the compiler, runtime and
     examples (337 declarations), driven by a per-function, string/comment-aware
     scan (binding targets only, never `x.f =` / `x[i] =`);
  C) turn on the check. bootstrap-cfree (compiler vs its own source) and every
     golden build (which splices the runtime) then proved zero reassigned `let`
     was missed anywhere.

Also folded in: removed leftover debug instrumentation in block() (a `cur=` /
print_int(777…) trace on the separator-error path) and fixed parse.ludic's stale
header comment (no more `struct`). Reseeded (21711 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 2026-08-27 23:52:59 +03:00
parent 573813609c
commit e1d7797e29
38 changed files with 2909 additions and 2778 deletions
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24
selfhost/emit_spawn.ludic
View file

@ -10,13 +10,13 @@ fn emit_init_component(e: ptr, comp: ptr, rec: Node) -> void {
let slot = nreg()
emit(" "); emit(slot); emit(" = getelementptr inbounds ["); emit(me); emit(" x %Cmp_"); emit(comp); emit("], ptr @S_"); emit(comp); emit(", i32 0, i32 "); emit(e); emit("\n")
# defaults
let f = 0
var f = 0
while f < len(c.kids) {
let fd = c.kids[f]
let addr = nreg()
emit(" "); emit(addr); emit(" = getelementptr inbounds %Cmp_"); emit(comp); emit(", ptr "); emit(slot); emit(", i32 0, i32 "); emit(itoa(f)); emit("\n")
let lt = llty(fd.ty)
let v = "0"
var v = "0"
if streq(lt, "ptr") { v = "null" }
if not ptr_is_null(fd.a) { let dv = emit_expr(fd.a); v = dv.code }
emit(" store "); emit(lt); emit(" "); emit(v); emit(", ptr "); emit(addr); emit("\n")
@ -24,7 +24,7 @@ fn emit_init_component(e: ptr, comp: ptr, rec: Node) -> void {
}
# per-spawn overrides
if not ptr_is_null(rec) {
let j = 0
var j = 0
while j < len(rec.kids) {
let fi = rec.kids[j]
let fidx = field_index(c, fi.s)
@ -53,7 +53,7 @@ fn emit_init_component(e: ptr, comp: ptr, rec: Node) -> void {
# @OnSpawn hook body can address them by name (like a query binding for one entity).
fn emit_bind_props(model: Node, e: ptr) -> void {
let me = itoa(MAX_ENT)
let c = 0
var c = 0
while c < len(model.kids) {
let pname = model.kids[c].s
let slot = nreg()
@ -73,11 +73,11 @@ fn emit_spawn(st: Node) -> void {
let kp = nreg(); emit(" "); emit(kp); emit(" = getelementptr inbounds ["); emit(me); emit(" x i32], ptr @L_kind, i32 0, i32 "); emit(e); emit("\n")
emit(" store i32 "); emit(itoa(ak)); emit(", ptr "); emit(kp); emit("\n")
let arch = find_arch(st.s)
let c = 0
var c = 0
while c < len(arch.kids) {
let cn = arch.kids[c].s
let rec = ptr_null()
let i = 0
var rec = ptr_null()
var i = 0
while i < len(st.kids) { if streq(st.kids[i].s, cn) { rec = st.kids[i].a }; i = i + 1 }
emit_init_component(e, cn, rec)
c = c + 1
@ -90,7 +90,7 @@ fn emit_spawn(st: Node) -> void {
nloc = save
}
} else {
let i = 0
var i = 0
while i < len(st.kids) { emit_init_component(e, st.kids[i].s, st.kids[i].a); i = i + 1 }
}
}
@ -102,7 +102,7 @@ fn emit_despawn(st: Node) -> void {
let me = itoa(MAX_ENT)
let kp = nreg(); emit(" "); emit(kp); emit(" = getelementptr inbounds ["); emit(me); emit(" x i32], ptr @L_kind, i32 0, i32 "); emit(v.code); emit("\n")
let kind = emit_bind(sconcat("load i32, ptr ", kp))
let i = 0
var i = 0
while i < len(g_ondespawn) {
let mname = g_ondespawn[i].s
let c = emit_bind(sconcat("icmp eq i32 ", sconcat(kind, sconcat(", ", itoa(find_arch_id(mname))))))
@ -120,13 +120,13 @@ fn emit_despawn(st: Node) -> void {
# data persists, so re-enabling restores it, and queries already skip a cleared
# flag). A bare `<Model>` / `<Handler>` flips a global enabled flag.
fn emit_toggle(st: Node) -> void {
let val = "0"; if st.ival == 1 { val = "1" }
var val = "0"; if st.ival == 1 { val = "1" }
if not ptr_is_null(st.a) {
let ev = emit_expr(st.a)
let me = itoa(MAX_ENT)
let hp = nreg(); emit(" "); emit(hp); emit(" = getelementptr inbounds ["); emit(me); emit(" x i8], ptr @H_"); emit(st.s); emit(", i32 0, i32 "); emit(ev.code); emit("\n")
emit(" store i8 "); emit(val); emit(", ptr "); emit(hp); emit("\n")
let hb: Node = ptr_null()
var hb: Node = ptr_null()
if st.ival == 1 { hb = onenable_body(st.s) } else { hb = ondisable_body(st.s) }
if not ptr_is_null(hb) {
let save = nloc
@ -138,7 +138,7 @@ fn emit_toggle(st: Node) -> void {
nloc = save
}
} else {
let g = "@HE_"; if is_model(st.s) { g = "@ME_" } # model vs handler
var g = "@HE_"; if is_model(st.s) { g = "@ME_" } # model vs handler
emit(" store i32 "); emit(val); emit(", ptr "); emit(g); emit(st.s); emit("\n")
}
}