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optimise do{...}while(false) (#1785)

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- better heuristics to avoid issues like #1532
- fix `TreeWalker.loopcontrol_target()`
  - `continue` cannot refer to `switch` blocks
This commit is contained in:
Alex Lam S.L
2017-04-04 23:48:22 +08:00
committed by GitHub
parent 4b90dc1fdb
commit 9b6bc67c33
3 changed files with 49 additions and 19 deletions
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10
lib/ast.js
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@@ -1035,16 +1035,16 @@ TreeWalker.prototype = {
self = p;
}
},
loopcontrol_target: function(label) {
loopcontrol_target: function(node) {
var stack = this.stack;
if (label) for (var i = stack.length; --i >= 0;) {
if (node.label) for (var i = stack.length; --i >= 0;) {
var x = stack[i];
if (x instanceof AST_LabeledStatement && x.label.name == label.name) {
if (x instanceof AST_LabeledStatement && x.label.name == node.label.name)
return x.body;
}
} else for (var i = stack.length; --i >= 0;) {
var x = stack[i];
if (x instanceof AST_Switch || x instanceof AST_IterationStatement)
if (x instanceof AST_IterationStatement
|| node instanceof AST_Break && x instanceof AST_Switch)
return x;
}
}