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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Improved catch handling in `figure_out_scope()` means special case treatment of IE8 is no longer valid in `reset_opt_flags()`.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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Self-referenced function has non-fixed values assigned to its parameters.
Let `unused` & `!keep_fnames` do the scanning, then apply `reduce_vars` only to unnamed functions.
fixes #1595
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- one-use function call => IIFE should take `eval()` & `arguments` into account
- if unused parameter cannot be eliminated, replace it with `0`
fixes #1583
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Function expression can be assigned to a variable and be given a name. Ensure function name is the reduced variable before clearing it out.
fixes #1573
fixes #1575
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`AST_Label.references` get `.initialize()` to `[]` every time after `.clone()`
So walk down the tree to pick up the cloned `AST_LoopControl` pieces and put it back together.
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- expose function body to call sites for potential optimisations
- suppress substitution of variable used within `AST_Defun`
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- unless `toplevel` is enabled
- global `const` works as before
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accounts for IE8- scoping
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fixes #1533
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Avoid variable substitution in the following cases:
- use of variable before declaration
- declaration within conditional code blocks
- declaration within loop body
fixes #1518
fixes #1525
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- improve marking efficiency
- apply smarter `const` replacement to `var`
fixes #1501
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- update modified flag between compress() passes
- support IIFE arguments
- fix corner case with multiple definitions
closes #1473
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- remove call to evaluate() in is_constant() and let nested optimize() does its job instead
- reject RegExp in is_constant() and remove special case logic under collapse_vars
- operands to conditionals optimisation are now always evaluate()-ed
- throw error in constant_value() instead of returning undefined to catch possible bugs, similar to make_node_from_constant()
- optimise binary boolean operators under `evaluate` instead of `conditionals`
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- gated by `unsafe`
- replaces previous optimisation specific to String.length
- "123"[0] => 1
- [1, 2, 3][0] => 1
- [1, 2, 3].length => 3
- does not apply to objects with overridden prototype functions
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