JoBoEVD/UglifyJS
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aa605495f828e0c5acb86aa2f3e0ef91bacde87b
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364 Commits

Author SHA1 Message Date
alexlamsl
aa605495f8 Merge branch 'master' into harmony-v2.8.6 2017-03-05 21:42:34 +08:00
kzc
33a26d456b patch up #1543 for harmony 
fixes #1537
 2017-03-05 21:39:31 +08:00
Alex Lam S.L
067e5a5762 fixup for #1553 (#1555) 
- `++a` is the one that is foldable
- transform `a++` into `++a` for better optimisation
 2017-03-05 17:15:37 +08:00
alexlamsl
49d9ac1c43 Merge branch 'master' into harmony-v2.8.6 2017-03-05 16:03:56 +08:00
Alex Lam S.L
35a849dc48 collapse assignment with adjacent subsequent usage (#1553) 
- consolidate `cascade` optimisations
- support ++/-- postfixes
- remove redundant optimisation identified in #1460

fixes #368
 2017-03-05 14:56:14 +08:00
Alex Lam S.L
b70591be1a handle variable declaration within catch blocks (#1546) 
accounts for IE8- scoping
 2017-03-05 13:13:44 +08:00
Alex Lam S.L
b33e7f88e6 improve unsafe on undefined (#1548) 
`unsafe` turns undefined keyword into a variable of the same name if found, but that interferes with other related optimisations.

Keep track of such transformations to ensure zero information loss in the process.
 2017-03-05 13:09:27 +08:00
Alex Lam S.L
1f0333e9f1 stay safe with constants in IE8- (#1547) 
- `undefined` etc. can be redefined at top-level for IE8-, so disable related optimisations
- fixed `--support-ie8` catch mangle bug
 2017-03-05 12:51:11 +08:00
Alex Lam S.L
78d1bb92d4 fix a corner case in #1530 (#1552) 2017-03-05 12:12:59 +08:00
kzc
ce54c9ccee disallow collapse_vars constant replacement in for-in statements (#1543) 2017-03-04 02:39:54 +08:00
Alex Lam S.L
07accd2fbb process code with implicit return statement (#1522) 
Bookmarklet for instance implicitedly assumes a "completion value" without using `return`.
The `expression` option now supports such use cases.
Optimisations on IIFEs also enhanced.

fixes #354
fixes #543
fixes #625
fixes #628
fixes #640
closes #1293
 2017-03-03 18:13:07 +08:00
Alex Lam S.L
18059cc94f compress numerical expressions (#1513) 
safe operations
- `a === b` => `a == b`
- `a + -b`  => `a - b`
- `-a + b`  => `b - a`
- `a+ +b`   => `+b+a`

associative operations
(bit-wise operations are safe, otherwise `unsafe_math`)
- `a + (b + c)`       => `(a + b) + c`
- `(n + 2) + 3`       => `5 + n`
- `(2 * n) * 3`       => `6 * n`
- `(a | 1) | (2 | d)` => `(3 | a) | b`

fixes #412
 2017-03-03 18:04:32 +08:00
alexlamsl
f704e9b65c fix destructing crash in reduce_vars 
fixes #1531
 2017-03-03 07:23:46 +08:00
alexlamsl
0b77d861a8 Merge branch 'master' into harmony-v2.8.5 2017-03-03 07:17:52 +08:00
Alex Lam S.L
b5e0e8c203 facilitate fix for #1531 (#1542) 2017-03-03 07:12:24 +08:00
Alex Lam S.L
17b81350d4 fix chained assignment with unused (#1540) 
When #1450 optimises `a=b=42`, it stops after the first variable even if both are unused.

fixes #1539
 2017-03-03 04:45:20 +08:00
kzc
4d63d4f5b3 collapse_vars should not replace constant in for-in init section (#1538) 
fixes #1537
 2017-03-03 03:51:15 +08:00
Alex Lam S.L
70d72ad806 properly cover all cases of for-in loop variables (#1536) 2017-03-03 02:39:57 +08:00
Alex Lam S.L
fe9227a41b fix reference marking in for-in loops (#1535) 
fixes #1533
 2017-03-03 00:56:06 +08:00
Alex Lam S.L
b49e142a26 disable do{...}while(false) optimisation (#1534) 
- fails to handle `break` in body

fixes #1532
 2017-03-03 00:54:41 +08:00
kzc
ee3b39b909 optimize trivial IIFEs returning constants (#1530) 2017-03-02 15:11:40 +08:00
Alex Lam S.L
9699ffb1af trim unused invocation parameters (#1526) 2017-03-02 11:33:59 +08:00
Alex Lam S.L
fdc9b9413b minor improvement to string optimisation (#1514) 
- "" + "a"     => "a"
- "" + a + "b" => a + "b"
- "a" + ""     => "a" (improving on #45)
 2017-03-02 11:31:39 +08:00
alexlamsl
80f3ad3ce0 Merge branch 'master' into harmony-v2.8.4 2017-03-02 11:16:55 +08:00
Alex Lam S.L
7aa69117e1 fix corner cases in reduce_vars (#1524) 
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
 2017-03-02 00:20:53 +08:00
Alex Lam S.L
c2334baa48 fix crash on missing props to string_template() (#1523) 
Patched up `make_node()` without `orig`.

There may be other cases where `start` could be missing, so make it print "undefined" instead of crashing.

fixes #1518
 2017-03-01 15:25:26 +08:00
alexlamsl
8a7a4749c7 Merge branch 'master' into harmony-v2.8.2 2017-03-01 11:06:33 +08:00
Alex Lam S.L
f5cbe19b75 invert reduce_vars tracking flag (#1519) 
Modules like webpack and grunt-contrib-uglify still uses `ast.transform(compressor)` before `Compressor.compress(ast)` was introduced.

Workaround this compatibility issue by deactivating `reduce_vars` in such case.

Also fix use case with omitted `options` when calling `Compressor()`.

fixes #1516
 2017-03-01 04:12:10 +08:00
Alex Lam S.L
b34fa11a13 fix evaluate on object getter & setter (#1515) 2017-03-01 02:03:47 +08:00
Alex Lam S.L
4365a51237 temporarily disables reduce_vars (#1517) 
... as we investigate #1516
 2017-03-01 00:25:43 +08:00
alexlamsl
57777b6cfa Merge branch 'master' into harmony-2.8.0 2017-02-28 02:28:58 +08:00
Alex Lam S.L
858e6c78a4 warn & drop #__PURE__ iff IIFE is dropped (#1511) 
- consolidate `side-effects` optimisations
- improve string `+` optimisation
- enhance literal & `conditionals` optimisations
 2017-02-28 02:25:44 +08:00
alexlamsl
b3a987b0df fix up drop_unused() 2017-02-27 05:11:01 +08:00
alexlamsl
88a338f29e Merge branch 'master' into harmony-2.8.0 2017-02-27 04:37:48 +08:00
Alex Lam S.L
13be50a4a9 faster tree transversal (#1462) 
- convert `[].forEach()` to for-loops
 2017-02-26 05:58:26 +08:00
Alex Lam S.L
16cd5d57a5 consolidate evaluate & reduce_vars (#1505) 
- improve marking efficiency
- apply smarter `const` replacement to `var`

fixes #1501
 2017-02-26 00:40:33 +08:00
Anthony Van de Gejuchte
07734b000a Destructuring consistency fixes (#1417) 
- Use AST_Destructuring for lhf assignment patterns
- Use AST_DefaultAssign for default assignments
- Add more checks for lhs expressions
- Add lots of testing
- Cleanup ast (e.g. remove default property)
- Fix #1402 based on a patch from @kzc
- Refine spread allowance in array destructring pattern
- Add destructuring AST tree checker
 2017-02-24 08:49:19 +08:00
alexlamsl
4e49302916 enable collapse_vars & reduce_vars by default 
- fix corner cases in `const` optimisation
- deprecate `/*@const*/`

fixes #1497
closes #1498
 2017-02-24 01:46:57 +08:00
kzc
1e51586996 Support marking a call as pure 
A function call or IIFE with an immediately preceding comment
containing `@__PURE__` or `#__PURE__` is deemed to be a
side-effect-free pure function call and can potentially be
dropped.

Depends on `side_effects` option.

`[#@]__PURE__` hint will be removed from comment when pure
call is dropped.

fixes #1261
closes #1448
 2017-02-21 14:24:18 +08:00
alexlamsl
26fbeece1c fix pure_funcs & improve side_effects 
- only drops side-effect-free arguments
- drop side-effect-free parts with discarded value from `AST_Seq` & `AST_SimpleStatement`

closes #1494
 2017-02-21 13:31:59 +08:00
alexlamsl
ec64acd2c8 introduce unsafe_proto 
- `Array.prototype.slice` => `[].slice`

closes #1491
 2017-02-21 13:29:58 +08:00
alexlamsl
e275148998 enhance global_defs 
- support arrays, objects & AST_Node
- support `"a.b":1` on both cli & API
- emit warning if variable is modified
- override top-level variables

fixes #1416
closes #1198
closes #1469
 2017-02-21 13:29:58 +08:00
alexlamsl
974247c8c0 evaluate AST_SymbolRef as parameter 
fix invalid boolean conversion now exposed in `make_node_from_constant()`

closes #1477
 2017-02-21 13:29:58 +08:00
alexlamsl
a0f4fd390a improve reduce_vars and fix a bug 
- update modified flag between compress() passes
- support IIFE arguments
- fix corner case with multiple definitions

closes #1473
 2017-02-21 13:29:58 +08:00
alexlamsl
b8b133d91a improve keep_fargs & keep_fnames 
- utilise in_use_ids instead of unreferenced()
- drop_unused now up-to-date for subsequent passes

closes #1476
 2017-02-21 13:29:58 +08:00
kzc
6ffbecb72b smarter const replacement taking name length into account 
closes #1459
 2017-02-21 13:29:58 +08:00
alexlamsl
f0ff6189be clean up negate_iife 
- remove extra tree scanning phase for `negate_iife`
- `negate_iife` now only deals with the narrowest form, i.e. IIFE sitting directly under `AST_SimpleStatement`
- `booleans`, `conditionals` etc. will now take care the rest via more accurate accounting
- `a(); void b();` => `a(); b();`

fixes #1288
closes #1451
 2017-02-21 13:29:58 +08:00
alexlamsl
6b3c49e458 improve string concatenation 
shuffle associative operations to minimise parentheses and aid other uglification efforts

closes #1454
 2017-02-21 13:29:57 +08:00
alexlamsl
f584ca8d07 -c sequences=N suboptimal at N expression cutoff 
N = 2:
  a;
  b;
  c;
  d;
was:
  a, b;
  c;
  d;
now:
  a, b;
  c, d;

fixes #1455
closes #1457
 2017-02-21 13:29:57 +08:00
alexlamsl
ae4db00991 tweak do-while loops 
- `do{...}while(false)` => `{...}`
- clean up `AST_While` logic

closes #1452
 2017-02-21 13:29:57 +08:00