JoBoEVD/UglifyJS
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

optimize constant switch blocks

Browse Source 
ref. mishoo/UglifyJS#441
This commit is contained in:
Mihai Bazon
2012-11-14 12:06:07 +02:00
parent 60c0f40250
commit dba8da4800
2 changed files with 258 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

186
test/compress/switch.js Normal file
View File

@@ -0,0 +1,186 @@
constant_switch_1: {
options = { dead_code: true, evaluate: true };
input: {
switch (1+1) {
case 1: foo(); break;
case 1+1: bar(); break;
case 1+1+1: baz(); break;
}
}
expect: {
bar();
}
}
constant_switch_2: {
options = { dead_code: true, evaluate: true };
input: {
switch (1) {
case 1: foo();
case 1+1: bar(); break;
case 1+1+1: baz();
}
}
expect: {
foo();
bar();
}
}
constant_switch_3: {
options = { dead_code: true, evaluate: true };
input: {
switch (10) {
case 1: foo();
case 1+1: bar(); break;
case 1+1+1: baz();
default:
def();
}
}
expect: {
def();
}
}
constant_switch_4: {
options = { dead_code: true, evaluate: true };
input: {
switch (2) {
case 1:
x();
if (foo) break;
y();
break;
case 1+1:
bar();
default:
def();
}
}
expect: {
bar();
def();
}
}
constant_switch_5: {
options = { dead_code: true, evaluate: true };
input: {
switch (1) {
case 1:
x();
if (foo) break;
y();
break;
case 1+1:
bar();
default:
def();
}
}
expect: {
// the break inside the if ruins our job
// we can still get rid of irrelevant cases.
switch (1) {
case 1:
x();
if (foo) break;
y();
}
// XXX: we could optimize this better by inventing an outer
// labeled block, but that's kinda tricky.
}
}
constant_switch_6: {
options = { dead_code: true, evaluate: true };
input: {
OUT: {
foo();
switch (1) {
case 1:
x();
if (foo) break OUT;
y();
case 1+1:
bar();
break;
default:
def();
}
}
}
expect: {
OUT: {
foo();
x();
if (foo) break OUT;
y();
bar();
}
}
}
constant_switch_7: {
options = { dead_code: true, evaluate: true };
input: {
OUT: {
foo();
switch (1) {
case 1:
x();
if (foo) break OUT;
for (var x = 0; x < 10; x++) {
if (x > 5) break; // this break refers to the for, not to the switch; thus it
// shouldn't ruin our optimization
console.log(x);
}
y();
case 1+1:
bar();
break;
default:
def();
}
}
}
expect: {
OUT: {
foo();
x();
if (foo) break OUT;
for (var x = 0; x < 10; x++) {
if (x > 5) break;
console.log(x);
}
y();
bar();
}
}
}
constant_switch_8: {
options = { dead_code: true, evaluate: true };
input: {
OUT: switch (1) {
case 1:
x();
for (;;) break OUT;
y();
break;
case 1+1:
bar();
default:
def();
}
}
expect: {
OUT: switch (1) {
case 1:
x();
for (;;) break OUT;
y();
}
}
}