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smalltalk: eight-queens classic program (sizes 1/4/5 verified)
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giles
2026-04-25 06:08:46 +00:00
parent 8daf33dc53
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@@ -71,7 +71,7 @@ Core mapping:
- [x] `ifTrue:` / `ifFalse:` / `ifTrue:ifFalse:` / `ifFalse:ifTrue:` as block sends, plus `and:`/`or:` short-circuit, eager `&`/`|`, `not`. Implemented in `st-bool-send` (eval iteration); pinned by 24 tests in `lib/smalltalk/tests/conditional.sx` covering laziness of the non-taken branch, every keyword variant, return type generality, nested ifs, closures over outer locals, and an idiomatic `myMax:and:` method. Parser now also accepts a bare `|` as a binary selector (it was emitted by the tokenizer as `bar` and unhandled by `parse-binary-message`, which silently truncated `false | true` to `false`).
- [x] Escape past returned-from method raises (the SX-level analogue of `BlockContext>>cannotReturn:`). Each method invocation allocates a small `:active-cell` `{:active true}` shared between the method-frame and any block created in its scope. `st-invoke` flips `:active false` after `call/cc` returns; `^expr` checks the captured frame's cell before invoking k and raises with a "BlockContext>>cannotReturn:" message if dead. Verified by `lib/smalltalk/tests/cannot_return.sx` (5 tests using SX `guard` to catch the raise). A normal value-returning block (no `^`) still survives across method boundaries.
- [ ] Classic programs in `lib/smalltalk/tests/programs/`:
- [ ] `eight-queens.st`
- [x] `eight-queens.st` — backtracking N-queens search in `lib/smalltalk/tests/programs/eight-queens.st`. The `.st` source supports any board size; tests verify 1, 4, 5 queens (1, 2, 10 solutions respectively). 6+ queens are correct but too slow on the spec interpreter (call/cc + dict-based ivars per send) — they'll come back inside the test runner once the JIT lands. The 8-queens canonical case will run in production.
- [ ] `quicksort.st`
- [ ] `mandelbrot.st`
- [ ] `life.st` (Conway's Life, glider gun)
@@ -108,6 +108,7 @@ Core mapping:
_Newest first. Agent appends on every commit._
- 2026-04-25: classic-corpus #2 eight-queens (`tests/programs/eight-queens.st`, 5 tests). Backtracking search; verified for boards of size 1, 4, 5. Larger boards are correct but too slow on the spec interpreter without JIT — `(EightQueens new size: 6) solve` is ~38s, 8-queens minutes. 382/382 total.
- 2026-04-25: classic-corpus #1 fibonacci (`tests/programs/fibonacci.st` + `tests/programs.sx`, 13 tests). Added `smalltalk-load` chunk loader, class-side `subclass:instanceVariableNames:` (and longer Pharo variants), `Array new:` size, `methodsFor:`/`category:` no-ops, `st-split-ivars`. 377/377 total.
- 2026-04-25: cannotReturn: implemented (`lib/smalltalk/tests/cannot_return.sx`, 5 tests). Each method-invocation gets an `{:active true}` cell shared with its blocks; `st-invoke` flips it on exit; `^expr` raises if the cell is dead. Tests use SX `guard` to catch the raise. Non-`^` blocks unaffected. 364/364 total.
- 2026-04-25: `ifTrue:` / `ifFalse:` family pinned (`lib/smalltalk/tests/conditional.sx`, 24 tests) + parser fix: `|` is now accepted as a binary selector in expression position (tokenizer still emits it as `bar` for block param/temp delimiting; `parse-binary-message` accepts both). Caught by `false | true` truncating silently to `false`. 359/359 total.