Brummel
832375f2ac
All 176 files in the four accumulating directories now use a zero-padded 4-digit counter prefix that reflects creation order (`NNNN-slug.md`). The counter is assigned per directory in strict git-log creation order; ties broken alphabetically by original name. The old `YYYY-MM-DD-` prefix on docs/specs/ and docs/plans/ files is dropped — the date is recoverable from git log and the counter carries the ordering. A file's counter is stable for the life of the file: never reassigned, never reused, never compacted. Deleted files retire their counter; subsequent files do not fill the gap. This is the property that lets cross-references stay literal — refs use the full filename including the counter (`design/contracts/0007-honesty-rule.md`) so they grep cleanly and resolve directly without a glob step. 313 cross-references updated across .md/.rs/.toml/.c/.json files (test pins, include_str! paths, design-INDEX entries, baseline notes, runtime C comments, inter-contract markdown links incl. bare basename and `../models/foo.md` forms). CLAUDE.md gets a new "File-naming convention" section spelling out the rule and rationale. skills/brainstorm/SKILL.md and skills/planner/SKILL.md updated so new spec/plan creation produces counter-prefixed names from the start. The full test suite (cargo test --workspace) passes.
74 lines
4.0 KiB
Markdown
74 lines
4.0 KiB
Markdown
# Prelude (built-in) classes
|
|
|
|
## Prelude (built-in) classes
|
|
|
|
The prelude ships the `Ordering` ADT, the `Eq` and `Ord`
|
|
[classes](0013-typeclasses.md), primitive `Eq Int/Bool/Str/Unit` and
|
|
`Ord Int/Bool/Str` instances, and the five polymorphic free-fn
|
|
helpers `ne`/`lt`/`le`/`gt`/`ge`. The primitive `Eq` / `Ord`
|
|
instance bodies are placeholder lambdas in `examples/prelude.ail`;
|
|
the codegen intercept `try_emit_primitive_instance_body` overrides
|
|
them with single-instruction bodies (`icmp eq i64` for `eq__Int`,
|
|
`icmp eq i1` for `eq__Bool`, `@ail_str_eq` for `eq__Str`,
|
|
`ret i1 1` for `eq__Unit`; a three-way `icmp` ladder constructing
|
|
`LT`/`EQ`/`GT` for `compare__T`) and attaches `alwaysinline` so
|
|
the call folds to the single instruction at every use site.
|
|
|
|
The five Ord-class free helpers (`ne`/`lt`/`le`/`gt`/`ge`) have
|
|
source-level bodies that route through `eq` / `compare` plus
|
|
`match` over `Ordering` — written that way so the surface form is
|
|
LLM-natural and so user-ADT instances of `Eq`/`Ord` automatically
|
|
pick up working helpers without any per-type opt-in. At Int the
|
|
codegen intercept short-circuits this indirection: `lt__Int`,
|
|
`le__Int`, `gt__Int`, `ge__Int`, and `ne__Int` are intercept-
|
|
overridden to emit `icmp slt i64` / `sle i64` / `sgt i64` /
|
|
`sge i64` / `ne i64` directly, bypassing the `compare__Int` →
|
|
`Ordering`-ctor → `match` path. Without this short-circuit the
|
|
`Ordering` ctor allocates per call inside hot loops — a real
|
|
cost surfaced by the `bench_closure_chain` regression at the
|
|
operator-routing-eq-ord milestone and pinned by
|
|
`crates/ail/tests/ord_int_intercept_ir_pin.rs`. The short-circuit
|
|
is *Int-only* by deliberate asymmetry: no current bench or
|
|
example fixture exercises Ord-`lt`/`le`/`gt`/`ge` at Bool or
|
|
Str at sufficient call frequency to justify the intercept-arm
|
|
maintenance; the symmetric extensions are mechanical when the
|
|
first such workload appears.
|
|
|
|
Float has neither `Eq` nor `Ord` instance per [Float semantics](
|
|
0005-float-semantics.md); a polymorphic helper invoked at Float fires
|
|
`NoInstance` at typecheck with a Float-aware diagnostic that names
|
|
the explicit `float_eq` / `float_lt` alternatives and
|
|
cross-references this section. The lookup machinery that turns a
|
|
`show x` call site into the right monomorphic instance is
|
|
documented in [method dispatch](0016-method-dispatch.md).
|
|
|
|
Float comparison is a separate surface: the six monomorphic prelude
|
|
fns `float_eq` / `float_ne` / `float_lt` / `float_le` / `float_gt`
|
|
/ `float_ge` each carry the type `(Float, Float) -> Bool` without
|
|
a class constraint. They lower via the same intercept machinery as
|
|
the primitive `Eq` instances (single `fcmp` instruction with the
|
|
matching predicate `oeq` / `une` / `olt` / `ole` / `ogt` / `oge`,
|
|
plus `alwaysinline`). They replace what would otherwise be a
|
|
polymorphic `==` / `<` on Float — Float gets full comparability
|
|
via explicit named fns, not via an implicit class instance.
|
|
|
|
The prelude ships `class Show a where show : (a borrow) -> Str` and
|
|
primitive `Show Int`, `Show Bool`, `Show Str`, `Show Float`
|
|
instances. Float **is** included in Show (unlike Eq/Ord) — IEEE-754
|
|
makes structural equality and total ordering semantically dubious,
|
|
but textual representation of a Float is well-defined modulo the
|
|
NaN-spelling caveat in [Float semantics](0005-float-semantics.md). Each
|
|
`Show <T>` instance body is a single-application lambda invoking the
|
|
corresponding runtime primitive (`int_to_str`, `bool_to_str`,
|
|
`str_clone`, `float_to_str`; see [Str ABI](0011-str-abi.md) for the
|
|
heap-Str primitives); no codegen intercept is required. The
|
|
polymorphic helper `print : forall a. Show a => a -> () !IO` has body
|
|
`\x -> let s = show x in do io/print_str s` (explicit let-binder for
|
|
heap-Str RC discipline per the Str carve-out in
|
|
[Str ABI](0011-str-abi.md)). The let-binder is
|
|
structurally pinned by `crates/ail/tests/print_mono_body_shape.rs`.
|
|
Routing through `print` is the path for non-`Str` primitives;
|
|
`io/print_str` is the only built-in direct-output effect-op.
|
|
|
|
Ratified by: `crates/ail/tests/show_no_instance_e2e.rs`.
|