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Phase 7c: string operators + and ==/!= (retire streq/sconcat)

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Strings are values now: `a + b` concatenates and `a == b` / `a != b` compare by
content, replacing the 605 `sconcat(...)` / `streq(...)` calls that made the
compiler read like C.

  streq(name, "let")            -> name == "let"
  sconcat("load ", reg)         -> "load " + reg
  sconcat(a, sconcat(b, c))     -> a + b + c

Implementation: emit_bin gains a string path. Strings are pointer-typed, so any
`+` with a pointer operand concatenates and `==`/`!=` between pointers compares
content — except when one side is the `null` literal, which stays a pointer
identity test (the only two kinds of pointer `==` in the codebase). Both call a
small hand-written IR prelude, @fn_str_eq / @fn_str_concat, emitted once into any
program that uses string ops (so it works for tools, games and the compiler with
no runtime-splice dependency and no duplicate symbols).

Delivered as two reseeds: (A) add the operators + prelude with the full
pointer-aware dispatch, keeping streq/sconcat; (B) migrate every call site
(354 lines, via a string-literal-safe balanced-paren script that leaves the
function definitions alone) and delete streq/sconcat. examples/strings.ludic +
a test.sh smoke (prints 1 2 3 4 5) guard it.

Reseeded (21890 lines); C-free fixpoint holds; goldens byte-identical; 18/18;
vocab + doc-fences clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-08-28 01:05:36 +03:00
parent 56024f2cba
commit a021362cdb
25 changed files with 3553 additions and 3248 deletions
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4
selfhost/emit_addr.ludic
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@ -8,9 +8,9 @@ var g_addr_ty: ptr # out-param: the type at the computed address
fn emit_member_addr(e: Node) -> ptr {
let base = emit_expr(e.a)
let s = layout_node(base.ty)
if (s == null) { perr(sconcat("member access on non-aggregate ", base.ty)) }
if (s == null) { perr((("member access on non-aggregate ") + base.ty)) }
let fidx = field_index(s, e.s)
if fidx < 0 { perr(sconcat("no such field ", e.s)) }
if fidx < 0 { perr(("no such field " + e.s)) }
g_addr_ty = field_type(s, e.s)
let r = nreg()
emit(" "); emit(r); emit(" = getelementptr inbounds "); emit(layout_ty(base.ty))