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fixes #2485
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fixes #2468
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- inline single-use function declarations as expressions when permissible
- depend on `reduce_vars`
- enabled by default
- disable for speed critical code
fixes #2464
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fixes #2449
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fixes #2450
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fixes #2442
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fixes #2440
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- defer declaration removal in `collapse_vars`
- account for `AST_SymbolFunarg` in deduplication
- private accounting for `collapse_vars`
- avoid issues with identity reference due to deep cloning
fixes #2437
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fixes #2423
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- only replace same-scope usages
- augment `test/ufuzz.js` to test for `this`
fixes #2420
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- trim array items only if `side_effects`
- extend to non-identifier properties
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`{ a: x, b: y }.a` => `[ x, y ][0]`
- `x` cannot be function containing `this`
`[ x, y, z ][1]` => `(x, z, y)`
- only if `z` is side-effect-free
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- constant expression
- single reference
- same scope
- not across loop body
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fixes #2336
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fixes #2198
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fixes #2140
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- empty body
- single `AST_Return`
- single `AST_SimpleStatement`
- avoid `/*#__PURE__*/`
Miscellaneous
- enhance single-use function substitution
fixes #281
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improve function name hack in `run_code()`
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- `reduce_vars`
- `side_effects`
- property access for object
- `AST_SymbolAccessor` as key names
enhance `test/ufuzz.js`
- add object getter & setter
- property assignment to setter
- avoid infinite recursion in setter
- fix & adjust assignment operators
- 50% `=`
- 25% `+=`
- 2.5% each for the rest
- avoid "Invalid array length"
- fix `console.log()`
- bypass getter
- curb recursive reference
- deprecate `-E`, always report runtime errors
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As this is not part of ES5.
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fixes #1922
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Determine if variables with non-constant values can escape and be modified.
fixes #1865
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Respect "funcs" and "vars" properly.
fixes #1850
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- extract leading value with side-effects out of `var` statement
- reduce scanning of `AST_Definitions` from 3 passes to just once
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`var a=1;a=2;x(a)` => `x(2)`
fix pre-existing issues
- reference counting on assignment
- walking of anonymous functions
- chained assignment
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Side effects of `&&` and `||` have not mattered until #1814, which takes assignment expressions into account.
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These are surprisingly common, as people reuse the same variable name within loops or switch branches.
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Possible partial execution due to exceptions.
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- allow immediate assignment after declaration of variable
- relax modification rule for immutable value
- fix order of visit for TreeWalker
- remove extraneous code
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- let `collapse_vars` take care of value containing any symbols
- improve overhead accounting
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Improved catch handling in `figure_out_scope()` means special case treatment of IE8 is no longer valid in `reset_opt_flags()`.
Also fixed recursive assignment in variable definition.
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`AST_Node.optimize()` is context-aware, so don't cache its results to be used elsewhere.
Also fixed a few cases of AST corruption and beef up safety of `pure_getters`.
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- fix side effects in switch condition for singular blocks
- fix `undefined` confusion with local variable
- gate `OPT(AST_Switch)` with `switches`
fixes #1758
fixes #1759
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Process variable definitions with or without assigned values against:
- `arguments`
- named function arguments
- multiple definitions within same scope
Essentially demote variable declarations with no value assignments.
Also fixed invalid use of `AST_VarDef` over `arguments` - should use a member of `AST_SymbolDeclaration` instead.
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Take conditional nature of switch branches into account.
fixes #1670
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That particular version of Node.js has messed up error messages, so provide a version-specific workaround.
Also fixed an formatting issue which would cause `expect_stdout` to fail if error message contains excerpts of input.
Apply `expect_stdout` to more applicable tests.
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`hoist_vars` converts variable declarations into plain assignments, which then confuses `reduce_vars`
fixes #1606
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