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enhance unsafe_comps (#5510)

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This commit is contained in:
Alex Lam S.L
2022-06-12 05:15:43 +01:00
committed by GitHub
parent 139fad0c05
commit 5d69545299
3 changed files with 26 additions and 9 deletions
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14
lib/compress.js
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@@ -2452,7 +2452,7 @@ Compressor.prototype.compress = function(node) {
function is_last_node(node, parent) {
if (node instanceof AST_Await) return true;
if (node.TYPE == "Binary") return !can_drop_op(node.operator, node.right);
if (node.TYPE == "Binary") return !can_drop_op(node.operator, node.right, compressor);
if (node instanceof AST_Call) {
var def, fn = node.expression;
if (fn instanceof AST_SymbolRef) {
@@ -5551,7 +5551,7 @@ Compressor.prototype.compress = function(node) {
def(AST_Binary, function(compressor) {
return this.left.has_side_effects(compressor)
|| this.right.has_side_effects(compressor)
|| !can_drop_op(this.operator, this.right);
|| !can_drop_op(this.operator, this.right, compressor);
});
def(AST_Block, function(compressor) {
return any(this.body, compressor);
@@ -5705,7 +5705,7 @@ Compressor.prototype.compress = function(node) {
def(AST_Binary, function(compressor) {
return this.left.may_throw(compressor)
|| this.right.may_throw(compressor)
|| !can_drop_op(this.operator, this.right);
|| !can_drop_op(this.operator, this.right, compressor);
});
def(AST_Block, function(compressor) {
return any(this.body, compressor);
@@ -8533,7 +8533,7 @@ Compressor.prototype.compress = function(node) {
var left = this.left;
var right = this.right;
var op = this.operator;
if (!can_drop_op(op, right)) {
if (!can_drop_op(op, right, compressor)) {
var lhs = left.drop_side_effect_free(compressor, first_in_statement);
if (lhs === left) return this;
var node = this.clone();
@@ -11202,13 +11202,13 @@ Compressor.prototype.compress = function(node) {
|| node instanceof AST_Object;
}
function can_drop_op(op, rhs) {
function can_drop_op(op, rhs, compressor) {
switch (op) {
case "in":
return is_object(rhs);
return is_object(rhs) || compressor && compressor.option("unsafe_comps");
case "instanceof":
if (rhs instanceof AST_SymbolRef) rhs = rhs.fixed_value();
return is_lambda(rhs);
return is_lambda(rhs) || compressor && compressor.option("unsafe_comps");
default:
return true;
}