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Merge fa69efa0c8 into 834f9f3924

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Artem S Vybornov 2017-02-24 21:53:59 +00:00 committed by GitHub
commit e31a96e0b5
2 changed files with 37 additions and 3 deletions
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17
lib/compress.js
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@ -138,13 +138,15 @@ merge(Compressor.prototype, {
},
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
// asm.js: drop unused only, leave everything else as is inside "use asm" scope
var asm = this.has_directive("use asm"),
was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
if (!asm) node = node.hoist_declarations(this);
was_scope = true;
}
descend(node, this);
node = node.optimize(this);
if (!asm) node = node.optimize(this);
if (was_scope && node instanceof AST_Scope) {
node.drop_unused(this);
descend(node, this);
@ -1384,6 +1386,15 @@ merge(Compressor.prototype, {
def(AST_Constant, return_false);
def(AST_This, return_false);
// asm.js: `new stdlib.XYZ` inside "use asm" scope are always pure
def(AST_New, function(compressor){
if (compressor.has_directive("use asm")) return false;
// AST_Call fallback
var pure = compressor.option("pure_funcs");
if (!pure) return true;
return pure.indexOf(this.expression.print_to_string()) < 0;
});
def(AST_Call, function(compressor){
if (!this.has_pure_annotation(compressor) && compressor.pure_funcs(this)) return true;
for (var i = this.args.length; --i >= 0;) {

23
lib/scope.js
View File

@ -289,6 +289,14 @@ AST_Scope.DEFMETHOD("def_variable", function(symbol){
AST_Scope.DEFMETHOD("next_mangled", function(options){
var ext = this.enclosed;
// asm.js: don't mask module-scope names
var asm = this.has_directive("use asm"),
pasm = this.parent_scope ? this.parent_scope.has_directive("use asm") : false;
if (pasm) {
this.cname = this.parent_scope.cname;
}
out: while (true) {
var m = base54(++this.cname);
if (!is_identifier(m)) continue; // skip over "do"
@ -297,6 +305,21 @@ AST_Scope.DEFMETHOD("next_mangled", function(options){
// shadow a name excepted from mangling.
if (options.except.indexOf(m) >= 0) continue;
// asm.js: don't reuse module name although it is out of the current scope
if (asm) {
var sym = this.name;
var penc = this.parent_scope.enclosed;
if (sym && penc.length) {
for (var i = 0; i < penc.length; i++) {
var psym = penc[i];
if (sym.name == psym.name) {
var name = psym.mangled_name || (psym.unmangleable(options) && psym.name);
if (m == name) continue out;
}
}
}
}
// we must ensure that the mangled name does not shadow a name
// from some parent scope that is referenced in this or in
// inner scopes.