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extend escape analysis on constant expression properties (#2509)

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fixes #2508
This commit is contained in:
Alex Lam S.L
2017-11-24 14:07:39 +08:00
committed by GitHub
parent eb001dc1d9
commit 3b28b915eb
2 changed files with 142 additions and 7 deletions
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16
lib/compress.js
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@@ -333,7 +333,7 @@ merge(Compressor.prototype, {
}
}
}
mark_escaped(d, node, value, 0);
mark_escaped(d, node.scope, node, value, 0);
}
if (node instanceof AST_SymbolCatch) {
node.definition().fixed = false;
@@ -623,10 +623,12 @@ merge(Compressor.prototype, {
}
}
function mark_escaped(d, node, value, level) {
function mark_escaped(d, scope, node, value, level) {
var parent = tw.parent(level);
if (value instanceof AST_Constant) return;
if (level > 0 && value instanceof AST_Function) return;
if (value) {
if (value.is_constant()) return;
if (level > 0 && value.is_constant_expression(scope)) 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
@@ -634,13 +636,13 @@ merge(Compressor.prototype, {
d.escaped = true;
return;
} else if (parent instanceof AST_Array) {
mark_escaped(d, parent, parent, level + 1);
mark_escaped(d, scope, parent, parent, level + 1);
} else if (parent instanceof AST_ObjectKeyVal && node === parent.value) {
var obj = tw.parent(level + 1);
mark_escaped(d, obj, obj, level + 2);
mark_escaped(d, scope, obj, obj, level + 2);
} else if (parent instanceof AST_PropAccess && node === parent.expression) {
value = read_property(value, parent.property);
mark_escaped(d, parent, value, level + 1);
mark_escaped(d, scope, parent, value, level + 1);
if (value) return;
}
if (level == 0) d.direct_access = true;