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improve switch optimisations (#1677)

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- correctly determine reachability of (default) branches
- gracefully handle multiple default branches
- optimise branches with duplicate bodies

fixes #376
fixes #441
fixes #1674
This commit is contained in:
Alex Lam S.L
2017-03-26 05:15:46 +08:00
committed by GitHub
parent b19aa58cff
commit f83d370f57
2 changed files with 232 additions and 95 deletions
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146
test/compress/switch.js
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@@ -23,6 +23,7 @@ constant_switch_2: {
}
expect: {
foo();
2;
bar();
}
}
@@ -117,6 +118,7 @@ constant_switch_6: {
x();
if (foo) break OUT;
y();
2;
bar();
}
}
@@ -155,6 +157,7 @@ constant_switch_7: {
console.log(x);
}
y();
2;
bar();
}
}
@@ -203,6 +206,7 @@ constant_switch_9: {
x();
for (;;) if (foo) break OUT;
y();
2;
bar();
def();
}
@@ -281,12 +285,152 @@ issue_1663: {
expect: {
var a = 100, b = 10;
function f() {
var b;
b = a++;
return ++b;
var b;
}
f();
console.log(a, b);
}
expect_stdout: true
}
drop_case: {
options = {
dead_code: true,
}
input: {
switch (foo) {
case 'bar': baz(); break;
case 'moo':
break;
}
}
expect: {
switch (foo) {
case 'bar': baz();
}
}
}
keep_case: {
options = {
dead_code: true,
}
input: {
switch (foo) {
case 'bar': baz(); break;
case moo:
break;
}
}
expect: {
switch (foo) {
case 'bar': baz(); break;
case moo:
}
}
}
issue_376: {
options = {
dead_code: true,
evaluate: true,
}
input: {
switch (true) {
case boolCondition:
console.log(1);
break;
case false:
console.log(2);
break;
}
}
expect: {
switch (true) {
case boolCondition:
console.log(1);
}
}
}
issue_441_1: {
options = {
dead_code: true,
}
input: {
switch (foo) {
case bar:
qux();
break;
case baz:
qux();
break;
default:
qux();
break;
}
}
expect: {
switch (foo) {
case bar:
case baz:
default:
qux();
}
}
}
issue_441_2: {
options = {
dead_code: true,
}
input: {
switch (foo) {
case bar:
// TODO: Fold into the case below
qux();
break;
case fall:
case baz:
qux();
break;
default:
qux();
break;
}
}
expect: {
switch (foo) {
case bar:
qux();
break;
case fall:
case baz:
default:
qux();
}
}
}
issue_1674: {
options = {
dead_code: true,
evaluate: true,
}
input: {
switch (0) {
default:
console.log("FAIL");
break;
case 0:
console.log("PASS");
break;
}
}
expect: {
console.log("PASS");
}
expect_stdout: "PASS"
}