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speed up equivalent_to() and AST_Switch (#1727)

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This commit is contained in:
Alex Lam S.L
2017-03-29 22:08:26 +08:00
committed by GitHub
parent 2e41cd6394
commit f1a833a7aa
1 changed files with 7 additions and 7 deletions
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14
lib/compress.js
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@@ -196,8 +196,7 @@ merge(Compressor.prototype, {
}); });
AST_Node.DEFMETHOD("equivalent_to", function(node){ AST_Node.DEFMETHOD("equivalent_to", function(node){
// XXX: this is a rather expensive way to test two node's equivalence: return this.TYPE == node.TYPE && this.print_to_string() == node.print_to_string();
return this.print_to_string() == node.print_to_string();
}); });
AST_Node.DEFMETHOD("process_expression", function(insert) { AST_Node.DEFMETHOD("process_expression", function(insert) {
@@ -2518,7 +2517,6 @@ merge(Compressor.prototype, {
self.expression = best_of_expression(expression, self.expression); self.expression = best_of_expression(expression, self.expression);
} }
if (!compressor.option("dead_code")) return self; if (!compressor.option("dead_code")) return self;
var prev_block;
var decl = []; var decl = [];
var body = []; var body = [];
var default_branch; var default_branch;
@@ -2547,14 +2545,16 @@ merge(Compressor.prototype, {
} }
} }
if (aborts(branch)) { if (aborts(branch)) {
var block = make_node(AST_BlockStatement, branch, branch).print_to_string(); if (body.length > 0 && !fallthrough) {
if (!fallthrough && prev_block === block) body[body.length - 1].body = []; var prev = body[body.length - 1];
if (prev.body.length == branch.body.length
&& make_node(AST_BlockStatement, prev, prev).equivalent_to(make_node(AST_BlockStatement, branch, branch)))
prev.body = [];
}
body.push(branch); body.push(branch);
prev_block = block;
fallthrough = false; fallthrough = false;
} else { } else {
body.push(branch); body.push(branch);
prev_block = null;
fallthrough = true; fallthrough = true;
} }
} }