* Space Lua: Add AST block type label/goto and duplicated label bools
* Space Lua: Add label/goto resolution and evaluation
Add per block map of labels metadata, per function block metadata cache
and `processBlock` to track AST blocks (`If`, `While`, `Repeat`, `For`
and `ForIn`, and `Do`) while recording labels and their positions.
Align with Lua scoping rules (_e.g._, a `goto` can not jump into the
scope of a local). Also allow the super-special "safe" end of block
cases (except inside `Repeat`). Duplicated labels are detected (error
`label 'foo' is already defined` etc.). The AST context for error
reporting is preserved. The `WeakMap` caches map any block to its
function's metadata.
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Space Lua: The `goto` parse flags and eval path
At parser mark each block with `hasLabel`/`hasGoto` and record the first
duplicated label. Flags then propagate through blocks and control flow.
If no `goto`, run the block in a simple loop and raise duplicate label
error if any is present. If `goto` exists, jump via a label map.
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Space Lua: Add labels and `goto` statement test suite
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Space Lua: Minor `goto`/labels improvement and test hotfix
- The `getBlockGotoMeta` now called only when a block has either
`hasGoto` or `hasLabel`.
- Add `BlocksFlags` type to get rid of some `(... as any)`s by view.
- Add `blockMetaOrThrow` helper.
- Fix test to reflect standard Lua semantics.
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Space Lua: Goto: Add missing Lua semantics checks
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Space Lua: Goto: Add Lua semantics checks also covered in Lua tests
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Space Lua: Goto: Fix semantic divergence revealed by fixing unfinished test
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Fix typo
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Space Lua: Optimize block env creation and cache goto metadata
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Avoid using the venomous snake case
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Add comment for WeakMap use
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Space Lua: Block Label Fast-path Optimization
Add block flag `hasLabelHere` during parsing and use it in eval to skip
expensive metadata generation for blocks and entire functions without
label or goto.
Refactor eval logic:
- early fast path when a function is known to have no label/goto,
- later fast path for blocks in functions with goto.
Fetch metadata only when needed.
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Space Lua: Remove `BlockFlags` indirection from eval
- Add `hasLabelHere` flag to `LuaBlock`.
- Remove `BlockFlags` indirection from eval.
- Set `hasLabelHere` directly.
- Add some "guards".
- Improve consistency of child filtering.
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
* Remove redundant return statement
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
---------
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
