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preserve function identity in reduce_vars (#2451)

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fixes #2450
This commit is contained in:
Alex Lam S.L
2017-11-08 03:28:46 +08:00
committed by GitHub
parent 38bfb73f06
commit 4c0b0177b6
2 changed files with 176 additions and 23 deletions
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45
lib/compress.js
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@@ -324,9 +324,8 @@ merge(Compressor.prototype, {
|| value.is_constant_expression(node.scope);
} else {
d.single_use = d.scope === node.scope
&& loop_ids[d.id] === in_loop
&& value.is_constant_expression();
}
}
} else {
d.single_use = false;
}
@@ -384,6 +383,7 @@ merge(Compressor.prototype, {
d.fixed = false;
} else {
d.fixed = node;
loop_ids[d.id] = in_loop;
mark(d, true);
if (ref_once(d)) {
d.single_use = d.scope === d.references[0].scope
@@ -577,7 +577,11 @@ merge(Compressor.prototype, {
}
function ref_once(def) {
return unused && !def.scope.uses_eval && !def.scope.uses_with && def.references.length == 1;
return unused
&& !def.scope.uses_eval
&& !def.scope.uses_with
&& def.references.length == 1
&& loop_ids[def.id] === in_loop;
}
function is_immutable(value) {
@@ -623,7 +627,8 @@ merge(Compressor.prototype, {
function mark_escaped(d, node, value, level) {
var parent = tw.parent(level);
if (value instanceof AST_Constant || value instanceof AST_Function) return;
if (value instanceof AST_Constant) return;
if (level > 0 && value instanceof AST_Function) return;
if (parent instanceof AST_Assign && parent.operator == "=" && node === parent.right
|| parent instanceof AST_Call && node !== parent.expression
|| parent instanceof AST_Return && node === parent.value && node.scope !== d.scope
@@ -4216,6 +4221,17 @@ merge(Compressor.prototype, {
return self;
});
function recursive_ref(compressor, def) {
var node;
for (var i = 0; node = compressor.parent(i); i++) {
if (node instanceof AST_Lambda) {
var name = node.name;
if (name && name.definition() === def) break;
}
}
return node;
}
OPT(AST_SymbolRef, function(self, compressor){
var def = self.resolve_defines(compressor);
if (def) {
@@ -4241,20 +4257,13 @@ merge(Compressor.prototype, {
if (fixed instanceof AST_Defun) {
d.fixed = fixed = make_node(AST_Function, fixed, fixed);
}
if (fixed && d.single_use) {
var recurse;
if (fixed instanceof AST_Function) {
for (var i = 0; recurse = compressor.parent(i); i++) {
if (recurse instanceof AST_Lambda) {
var name = recurse.name;
if (name && name.definition() === d) break;
}
}
}
if (!recurse) {
var value = fixed.optimize(compressor);
return value === fixed ? fixed.clone(true) : value;
}
if (fixed
&& d.single_use
&& !(fixed instanceof AST_Function
&& (d.escaped && d.scope !== self.scope
|| recursive_ref(compressor, d)))) {
var value = fixed.optimize(compressor);
return value === fixed ? fixed.clone(true) : value;
}
if (fixed && d.should_replace === undefined) {
var init;