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enhance dead_code (#3990)

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This commit is contained in:
Alex Lam S.L
2020-06-11 19:16:13 +01:00
committed by GitHub
parent e89031f1af
commit e9465717ab
2 changed files with 152 additions and 17 deletions
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130
test/compress/dead-code.js
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@@ -1169,29 +1169,131 @@ redundant_assignments: {
expect_stdout: "PASS PASS"
}
self_assignments: {
self_assignments_1: {
options = {
dead_code: true,
}
input: {
var a = "PASS", b = 0, l = [ "FAIL", "PASS" ], o = { p: "PASS" };
var a = "PASS";
a = a;
l[0] = l[0];
l[b] = l[b];
l[b++] = l[b++];
o.p = o.p;
console.log(a, b, l[0], o.p);
console.log(a);
}
expect: {
var a = "PASS", b = 0, l = [ "FAIL", "PASS" ], o = { p: "PASS" };
var a = "PASS";
a;
l[0];
l[b];
l[b++] = l[b++];
o.p;
console.log(a, b, l[0], o.p);
console.log(a);
}
expect_stdout: "PASS 2 PASS PASS"
expect_stdout: "PASS"
}
self_assignments_2: {
options = {
dead_code: true,
pure_getters: "strict",
reduce_vars: true,
side_effects: true,
toplevel: true,
}
input: {
var a = "q", o = {
p: "PASS",
};
o.p = o.p;
o[a] = o[a];
console.log(o.p, o[a]);
}
expect: {
var a = "q", o = {
p: "PASS",
};
console.log(o.p, o[a]);
}
expect_stdout: "PASS undefined"
}
self_assignments_3: {
options = {
dead_code: true,
pure_getters: "strict",
reduce_vars: true,
side_effects: true,
toplevel: true,
}
input: {
var a = "q", o = {
p: "FAIL",
get q() {
return "PASS";
},
set q(v) {
this.p = v;
},
};
o.p = o.p;
o[a] = o[a];
console.log(o.p, o[a]);
}
expect: {
var a = "q", o = {
p: "FAIL",
get q() {
return "PASS";
},
set q(v) {
this.p = v;
},
};
o.p = o.p;
o[a] = o[a];
console.log(o.p, o[a]);
}
expect_stdout: "PASS PASS"
}
self_assignments_4: {
options = {
dead_code: true,
pure_getters: "strict",
reduce_vars: true,
side_effects: true,
toplevel: true,
}
input: {
var i = 0, l = [ "PASS" ];
l[0] = l[0];
l[i] = l[i];
console.log(l[0], i);
}
expect: {
var i = 0, l = [ "PASS" ];
console.log(l[0], i);
}
expect_stdout: "PASS 0"
}
self_assignments_5: {
options = {
dead_code: true,
evaluate: true,
passes: 3,
pure_getters: "strict",
reduce_vars: true,
side_effects: true,
toplevel: true,
}
input: {
var i = 0, l = [ "FAIL", "PASS" ];
l[0] = l[0];
l[i] = l[i];
l[i++] = l[i++];
console.log(l[0], i);
}
expect: {
var i = 0, l = [ "FAIL", "PASS" ];
l[0] = l[1];
console.log(l[0], 2);
}
expect_stdout: "PASS 2"
}
issue_3967: {