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fix corner case in dead_code (#3553)

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fixes #3552
This commit is contained in:
Alex Lam S.L
2019-10-30 14:21:22 +08:00
committed by GitHub
parent f1eb03f2c0
commit ec7f071272
2 changed files with 33 additions and 9 deletions
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20
lib/compress.js
View File

@@ -6433,15 +6433,17 @@ merge(Compressor.prototype, {
OPT(AST_Assign, function(self, compressor) {
if (compressor.option("dead_code")) {
if (self.left instanceof AST_PropAccess) {
var exp = self.left.expression;
if (exp instanceof AST_Lambda
|| !compressor.has_directive("use strict")
&& exp instanceof AST_Constant
&& !exp.may_throw_on_access(compressor)) {
return self.left instanceof AST_Dot ? self.right : make_sequence(self, [
self.left.property,
self.right
]).optimize(compressor);
if (self.operator == "=") {
var exp = self.left.expression;
if (exp instanceof AST_Lambda
|| !compressor.has_directive("use strict")
&& exp instanceof AST_Constant
&& !exp.may_throw_on_access(compressor)) {
return self.left instanceof AST_Dot ? self.right : make_sequence(self, [
self.left.property,
self.right
]).optimize(compressor);
}
}
} else if (self.left instanceof AST_SymbolRef) {
var def = self.left.definition();

22
test/compress/dead-code.js
View File

@@ -1042,3 +1042,25 @@ function_assign: {
}
expect_stdout: "PASS"
}
issue_3552: {
options = {
dead_code: true,
pure_getters: "strict",
}
input: {
var a = "PASS";
(function() {
(1..p += 42) && (a = "FAIL");
})();
console.log(a);
}
expect: {
var a = "PASS";
(function() {
(1..p += 42) && (a = "FAIL");
})();
console.log(a);
}
expect_stdout: "PASS"
}