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Asm.js: bypass any compression transformations exept drop_unused

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Artem S Vybornov 2013-12-17 01:46:57 +04:00
parent b91dca87ee
commit fa69efa0c8
1 changed files with 14 additions and 3 deletions
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17
lib/compress.js
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@ -89,13 +89,15 @@ merge(Compressor.prototype, {
}, },
before: function(node, descend, in_list) { before: function(node, descend, in_list) {
if (node._squeezed) return node; 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) { if (node instanceof AST_Scope) {
node = node.hoist_declarations(this); if (!asm) node = node.hoist_declarations(this);
was_scope = true; was_scope = true;
} }
descend(node, this); descend(node, this);
node = node.optimize(this); if (!asm) node = node.optimize(this);
if (was_scope && node instanceof AST_Scope) { if (was_scope && node instanceof AST_Scope) {
node.drop_unused(this); node.drop_unused(this);
descend(node, this); descend(node, this);
@ -893,6 +895,15 @@ merge(Compressor.prototype, {
def(AST_Constant, function(compressor){ return false }); def(AST_Constant, function(compressor){ return false });
def(AST_This, function(compressor){ return false }); def(AST_This, function(compressor){ 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){ def(AST_Call, function(compressor){
var pure = compressor.option("pure_funcs"); var pure = compressor.option("pure_funcs");
if (!pure) return true; if (!pure) return true;