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more on detecting side effects

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This commit is contained in:
Mihai Bazon
2012-09-21 11:23:44 +03:00
parent e8da72d304
commit c4f8c2103f
1 changed files with 13 additions and 1 deletions
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14
lib/compress.js
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@@ -690,6 +690,13 @@ function Compressor(options, false_by_default) {
def(AST_Constant, function(){ return false });
def(AST_This, function(){ return false });
def(AST_Function, function(){ return false });
def(AST_BlockStatement, function(){
for (var i = this.body.length; --i >= 0;) {
if (this.body[i].has_side_effects())
return true;
}
return false;
});
def(AST_SimpleStatement, function(){
return this.body.has_side_effects();
@@ -707,7 +714,8 @@ function Compressor(options, false_by_default) {
def(AST_Unary, function(){
return this.operator == "delete"
|| this.operator == "++"
|| this.operator == "--";
|| this.operator == "--"
|| this.expression.has_side_effects();
});
def(AST_SymbolRef, function(){ return false });
def(AST_Object, function(){
@@ -732,6 +740,10 @@ function Compressor(options, false_by_default) {
return this.expression.has_side_effects()
|| this.property.has_side_effects();
});
def(AST_Seq, function(){
return this.car.has_side_effects()
|| this.cdr.has_side_effects();
});
})(function(node, func){
node.DEFMETHOD("has_side_effects", func);
});