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fix infinite loop triggered by #3347

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fixes #3353
This commit is contained in:
alexlamsl 2019-03-23 03:13:44 +08:00
parent e3c565b46f
commit 07e90e2b95
1 changed files with 25 additions and 5 deletions
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30
lib/compress.js
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@ -2246,7 +2246,11 @@ merge(Compressor.prototype, {
});
def(AST_SymbolRef, function() {
var fixed = this.fixed_value();
return fixed && fixed.is_truthy();
if (!fixed) return false;
this.is_truthy = return_false;
var result = fixed.is_truthy();
delete this.is_truthy;
return result;
});
})(function(node, func) {
node.DEFMETHOD("is_truthy", func);
@ -2300,7 +2304,11 @@ merge(Compressor.prototype, {
if (is_undeclared_ref(this) && this.is_declared(compressor)) return false;
if (this.is_immutable()) return false;
var fixed = this.fixed_value();
return !fixed || fixed._dot_throw(compressor);
if (!fixed) return true;
this._dot_throw = return_true;
var result = fixed._dot_throw(compressor);
delete this._dot_throw;
return result;
});
def(AST_UnaryPrefix, function() {
return this.operator == "void";
@ -2342,7 +2350,11 @@ merge(Compressor.prototype, {
});
def(AST_SymbolRef, function(compressor) {
var fixed = this.fixed_value();
return fixed && fixed.is_boolean(compressor);
if (!fixed) return false;
this.is_boolean = return_false;
var result = fixed.is_boolean(compressor);
delete this.is_boolean;
return result;
});
var unary = makePredicate("! delete");
def(AST_UnaryPrefix, function() {
@ -2427,7 +2439,11 @@ merge(Compressor.prototype, {
});
def(AST_SymbolRef, function(compressor) {
var fixed = this.fixed_value();
return fixed && fixed.is_number(compressor);
if (!fixed) return false;
this.is_number = return_false;
var result = fixed.is_number(compressor);
delete this.is_number;
return result;
});
var unary = makePredicate("+ - ~ ++ --");
def(AST_Unary, function() {
@ -2456,7 +2472,11 @@ merge(Compressor.prototype, {
def(AST_String, return_true);
def(AST_SymbolRef, function(compressor) {
var fixed = this.fixed_value();
return fixed && fixed.is_string(compressor);
if (!fixed) return false;
this.is_string = return_false;
var result = fixed.is_string(compressor);
delete this.is_string;
return result;
});
def(AST_UnaryPrefix, function() {
return this.operator == "typeof";