Brummel
c6c0a10788
Top-level fn names are now usable as values, fn-typed parameters can be called as `f(args)`. KISS slice of "closures + HOFs + TIR": no TIR, no heap, no ABI shift — that bundle stays in Iter 8 where closure-with-capture and lambdas land together. Codegen: - Type::Fn lowers to LLVM `ptr`; sig travels via a per-fn-body `ssa_fn_sigs` sidetable on `Emitter`. - Term::Var falls through to `resolve_top_level_fn` when the name is not a local; emits `@ail_<m>_<def>` and registers the sig. - Term::App splits: static callee (builtin / current-module / qualified) keeps the existing direct path; otherwise lower the callee, look up the sig, emit indirect `call <ret> (<param-tys>) %fn(args...)`. - emit_fn registers fn-typed params in the sidetable on entry. - If branches propagate a fn-pointer sig to their phi when both arms match. Typechecker: unchanged. It already accepted `synth(callee)` against Type::Fn; the only blocker was codegen rejecting non-Var callees. Tests: 48 green (was 47). New `examples/hof.ail.json` and e2e `higher_order_apply_inc` exercise `apply(inc, 41) == 42` end-to-end. DESIGN.md: "What is not (yet) supported" rewritten — closures-with- capture and lambdas remain pending, first-class fn-refs added as positive bullet. Smoke-test list extended with `hof.ail.json`. JOURNAL.md: Iter 7 entry with rationale, scope choice, architecture self-check, Iter 8 plan. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
78 lines
1.7 KiB
JSON
78 lines
1.7 KiB
JSON
{
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"schema": "ailang/v0",
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"name": "hof",
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"imports": [],
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"defs": [
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{
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"kind": "fn",
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"name": "inc",
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"type": {
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"k": "fn",
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"params": [{ "k": "con", "name": "Int" }],
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"ret": { "k": "con", "name": "Int" },
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"effects": []
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},
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"params": ["x"],
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"doc": "increment by one",
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"body": {
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"t": "app",
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"fn": { "t": "var", "name": "+" },
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"args": [
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{ "t": "var", "name": "x" },
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{ "t": "lit", "lit": { "kind": "int", "value": 1 } }
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]
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}
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},
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{
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"kind": "fn",
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"name": "apply",
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"type": {
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"k": "fn",
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"params": [
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{
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"k": "fn",
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"params": [{ "k": "con", "name": "Int" }],
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"ret": { "k": "con", "name": "Int" },
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"effects": []
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},
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{ "k": "con", "name": "Int" }
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],
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"ret": { "k": "con", "name": "Int" },
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"effects": []
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},
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"params": ["f", "x"],
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"doc": "apply a fn-of-Int to an Int",
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"body": {
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"t": "app",
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"fn": { "t": "var", "name": "f" },
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"args": [{ "t": "var", "name": "x" }]
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}
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},
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{
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"kind": "fn",
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"name": "main",
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"type": {
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"k": "fn",
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"params": [],
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"ret": { "k": "con", "name": "Unit" },
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"effects": ["IO"]
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},
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"params": [],
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"body": {
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"t": "do",
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"op": "io/print_int",
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"args": [
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{
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"t": "app",
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"fn": { "t": "var", "name": "apply" },
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"args": [
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{ "t": "var", "name": "inc" },
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{ "t": "lit", "lit": { "kind": "int", "value": 41 } }
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]
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}
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]
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}
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}
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]
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}
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