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add control flow support and deopt bindings on assignments that we can't understand

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This commit is contained in:
Sebastian McKenzie 2015-06-05 07:46:32 +01:00
parent 7b676d608b
commit c7c16ad9c1
1 changed files with 18 additions and 4 deletions
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22
src/babel/transformation/transformers/minification/constant-folding.js
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@ -10,11 +10,25 @@ export function AssignmentExpression() {
if (!left.isIdentifier()) return;
var binding = this.scope.getBinding(left.node.name);
if (!binding) return;
if (!binding || binding.deoptValue) return;
var right = this.get("right");
var evaluated = right.evaluate();
//if (evaluated.confident) binding.setValue(evaluated.value);
var evaluated = this.get("right").evaluate();
if (evaluated.confident) {
binding.setValue(evaluated.value);
} else {
binding.deoptValue();
}
}
export function IfStatement() {
var evaluated = this.get("test").evaluate();
if (!evaluated.confident) return this.skip();
if (evaluated.value) {
this.skipKey("alternate");
} else {
this.skipKey("consequent");
}
}
export var Scopable = {