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fix corner cases in side_effects (#5293)

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fixes #5292
This commit is contained in:
Alex Lam S.L
2022-01-14 01:14:04 +00:00
committed by GitHub
parent ff3c2ed7a2
commit 14e1311bdf
2 changed files with 157 additions and 15 deletions
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17
lib/compress.js
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@@ -5399,7 +5399,7 @@ Compressor.prototype.compress = function(node) {
return any(this.properties, compressor);
});
def(AST_Dot, function(compressor) {
return !this.optional && this.expression.may_throw_on_access(compressor)
return this.expression.may_throw_on_access(compressor)
|| this.expression.has_side_effects(compressor);
});
def(AST_EmptyStatement, return_false);
@@ -5430,7 +5430,7 @@ Compressor.prototype.compress = function(node) {
return this.body.has_side_effects(compressor);
});
def(AST_Sub, function(compressor) {
return !this.optional && this.expression.may_throw_on_access(compressor)
return this.expression.may_throw_on_access(compressor)
|| this.expression.has_side_effects(compressor)
|| this.property.has_side_effects(compressor);
});
@@ -8370,7 +8370,7 @@ Compressor.prototype.compress = function(node) {
});
def(AST_Dot, function(compressor, first_in_statement) {
var expr = this.expression;
if (!this.optional && expr.may_throw_on_access(compressor)) return this;
if (expr.may_throw_on_access(compressor)) return this;
return expr.drop_side_effect_free(compressor, first_in_statement);
});
def(AST_Function, function(compressor) {
@@ -8429,17 +8429,8 @@ Compressor.prototype.compress = function(node) {
});
def(AST_Sub, function(compressor, first_in_statement) {
var expr = this.expression;
if (expr.may_throw_on_access(compressor)) return this;
var prop = this.property;
if (expr.may_throw_on_access(compressor)) {
if (!this.optional) return this;
if (prop.has_side_effects(compressor)) {
prop = prop.drop_side_effect_free(compressor);
if (!prop) return expr.drop_side_effect_free(compressor, first_in_statement);
var node = this.clone();
node.property = prop;
return node;
}
}
expr = expr.drop_side_effect_free(compressor, first_in_statement);
if (!expr) return prop.drop_side_effect_free(compressor, first_in_statement);
prop = prop.drop_side_effect_free(compressor);