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fix corner case in dead_code (#3831)

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fixes #3830
This commit is contained in:
Alex Lam S.L
2020-04-30 14:52:57 +01:00
committed by GitHub
parent 39f849590b
commit d900006973
2 changed files with 203 additions and 0 deletions
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1
lib/compress.js
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@@ -7532,6 +7532,7 @@ merge(Compressor.prototype, {
node = parent;
parent = compressor.parent(level++);
if (parent instanceof AST_Assign) {
if (parent.left instanceof AST_PropAccess) break;
if (!(parent.left instanceof AST_SymbolRef)) continue;
if (parent.left.definition() !== def) continue;
if (in_try(level, parent)) break;

202
test/compress/dead-code.js
View File

@@ -949,3 +949,205 @@ issue_3578: {
}
expect_stdout: "PASS"
}
issue_3830_1: {
options = {
dead_code: true,
}
input: {
var o = {
set p(v) {
o = o.p = o = v;
}
};
o.p = "PASS";
console.log(o);
}
expect: {
var o = {
set p(v) {
o = o.p = o = v;
}
};
o.p = "PASS";
console.log(o);
}
expect_stdout: "PASS"
}
issue_3830_2: {
options = {
dead_code: true,
}
input: {
var a = "FAIL";
var o = {
set FAIL(v) {
a = o[a] = a = v;
}
};
o[a] = "PASS";
console.log(a);
}
expect: {
var a = "FAIL";
var o = {
set FAIL(v) {
a = o[a] = a = v;
}
};
o[a] = "PASS";
console.log(a);
}
expect_stdout: "PASS"
}
issue_3830_3: {
options = {
dead_code: true,
}
input: {
function f() {
return a;
}
var a = "FAIL";
var o = {
set FAIL(v) {
a = o[f()] = a = v;
}
};
o[f()] = "PASS";
console.log(a);
}
expect: {
function f() {
return a;
}
var a = "FAIL";
var o = {
set FAIL(v) {
a = o[f()] = a = v;
}
};
o[f()] = "PASS";
console.log(a);
}
expect_stdout: "PASS"
}
issue_3830_4: {
options = {
dead_code: true,
}
input: {
function f() {
return o;
}
var a = "FAIL";
var o = {
set FAIL(v) {
a = f()[a] = a = v;
}
};
f()[a] = "PASS";
console.log(a);
}
expect: {
function f() {
return o;
}
var a = "FAIL";
var o = {
set FAIL(v) {
a = f()[a] = a = v;
}
};
f()[a] = "PASS";
console.log(a);
}
expect_stdout: "PASS"
}
issue_3830_5: {
options = {
dead_code: true,
}
input: {
function f() {
return o;
}
function g() {
return a;
}
var a = "FAIL";
var o = {
set FAIL(v) {
a = f()[g()] = a = v;
}
};
f()[g()] = "PASS";
console.log(a);
}
expect: {
function f() {
return o;
}
function g() {
return a;
}
var a = "FAIL";
var o = {
set FAIL(v) {
a = f()[g()] = a = v;
}
};
f()[g()] = "PASS";
console.log(a);
}
expect_stdout: "PASS"
}
issue_3830_6: {
options = {
dead_code: true,
}
input: {
function f() {
return o;
}
function g() {
return a;
}
function h(v) {
a = f()[g()] = a = v;
}
var a = "FAIL";
var o = {
set FAIL(v) {
h(v);
}
};
o.FAIL = "PASS";
console.log(a);
}
expect: {
function f() {
return o;
}
function g() {
return a;
}
function h(v) {
a = f()[g()] = a = v;
}
var a = "FAIL";
var o = {
set FAIL(v) {
h(v);
}
};
o.FAIL = "PASS";
console.log(a);
}
expect_stdout: "PASS"
}