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fix corner cases with instanceof (#5509)

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- enhance `evaluate`
This commit is contained in:
Alex Lam S.L
2022-06-12 03:01:54 +01:00
committed by GitHub
parent 99946a3993
commit 139fad0c05
10 changed files with 167 additions and 25 deletions
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28
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 node.operator == "in" && !is_object(node.right);
if (node.TYPE == "Binary") return !can_drop_op(node.operator, node.right);
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)
|| this.operator == "in" && !is_object(this.right);
|| !can_drop_op(this.operator, this.right);
});
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)
|| this.operator == "in" && !is_object(this.right);
|| !can_drop_op(this.operator, this.right);
});
def(AST_Block, function(compressor) {
return any(this.body, compressor);
@@ -5822,7 +5822,7 @@ Compressor.prototype.compress = function(node) {
def(AST_Binary, function(scope) {
return this.left.is_constant_expression(scope)
&& this.right.is_constant_expression(scope)
&& (this.operator != "in" || is_object(this.right));
&& can_drop_op(this.operator, this.right);
});
def(AST_Class, function(scope) {
var base = this.extends;
@@ -8533,7 +8533,7 @@ Compressor.prototype.compress = function(node) {
var left = this.left;
var right = this.right;
var op = this.operator;
if (op == "in" && !is_object(right)) {
if (!can_drop_op(op, right)) {
var lhs = left.drop_side_effect_free(compressor, first_in_statement);
if (lhs === left) return this;
var node = this.clone();
@@ -11202,6 +11202,18 @@ Compressor.prototype.compress = function(node) {
|| node instanceof AST_Object;
}
function can_drop_op(op, rhs) {
switch (op) {
case "in":
return is_object(rhs);
case "instanceof":
if (rhs instanceof AST_SymbolRef) rhs = rhs.fixed_value();
return is_lambda(rhs);
default:
return true;
}
}
function is_primitive(compressor, node) {
if (node.is_constant()) return true;
if (node instanceof AST_Assign) return node.operator != "=" || is_primitive(compressor, node.right);
@@ -11708,6 +11720,12 @@ Compressor.prototype.compress = function(node) {
}
}
break;
case "instanceof":
if (is_lambda(self.right)) return make_sequence(self, [
self,
make_node(AST_False, self),
]).optimize(compressor);
break;
}
if (!(parent instanceof AST_UnaryPrefix && parent.operator == "delete")) {
if (self.left instanceof AST_Number && !self.right.is_constant()) switch (self.operator) {