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Avoid shadowing name of function expression with function argument

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Close #179, #326, #327
This commit is contained in:
Mihai Bazon
2013-10-29 13:18:09 +02:00
parent f1b7094a57
commit a14c6b6574
1 changed files with 15 additions and 2 deletions
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17
lib/scope.js
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@@ -64,9 +64,9 @@ SymbolDef.prototype = {
mangle: function(options) {
if (!this.mangled_name && !this.unmangleable(options)) {
var s = this.scope;
if (this.orig[0] instanceof AST_SymbolLambda && !options.screw_ie8)
if (!options.screw_ie8 && this.orig[0] instanceof AST_SymbolLambda)
s = s.parent_scope;
this.mangled_name = s.next_mangled(options);
this.mangled_name = s.next_mangled(options, this);
}
}
};
@@ -256,6 +256,19 @@ AST_Scope.DEFMETHOD("next_mangled", function(options){
}
});
AST_Function.DEFMETHOD("next_mangled", function(options, def){
// #179, #326
// in Safary strict mode, something like (function x(x){...}) is a syntax error;
// a function expression's argument cannot shadow the function expression's name
var tricky_def = def.orig[0] instanceof AST_SymbolFunarg && this.name && this.name.definition();
while (true) {
var name = AST_Lambda.prototype.next_mangled.call(this, options, def);
if (!(tricky_def && tricky_def.mangled_name == name))
return name;
}
});
AST_Scope.DEFMETHOD("references", function(sym){
if (sym instanceof AST_Symbol) sym = sym.definition();
return this.enclosed.indexOf(sym) < 0 ? null : sym;