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enhance reduce_vars (#1814)

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- allow immediate assignment after declaration of variable
- relax modification rule for immutable value
- fix order of visit for TreeWalker
- remove extraneous code
This commit is contained in:
Alex Lam S.L
2017-04-17 01:36:50 +08:00
committed by GitHub
parent 44dfa5a318
commit 1a498db2d3
3 changed files with 193 additions and 33 deletions
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140
test/compress/reduce_vars.js
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@@ -1996,6 +1996,146 @@ catch_var: {
expect_stdout: "true"
}
var_assign_1: {
options = {
evaluate: true,
reduce_vars: true,
sequences: true,
side_effects: true,
unused: true,
}
input: {
!function() {
var a;
a = 2;
console.log(a);
}();
}
expect: {
!function() {
console.log(2);
}();
}
expect_stdout: "2"
}
var_assign_2: {
options = {
evaluate: true,
reduce_vars: true,
sequences: true,
side_effects: true,
unused: true,
}
input: {
!function() {
var a;
if (a = 2) console.log(a);
}();
}
expect: {
!function() {
if (2) console.log(2);
}();
}
expect_stdout: "2"
}
var_assign_3: {
options = {
evaluate: true,
reduce_vars: true,
sequences: true,
side_effects: true,
unused: true,
}
input: {
!function() {
var a;
while (a = 2);
console.log(a);
}();
}
expect: {
!function() {
var a;
while (a = 2);
console.log(a);
}();
}
}
var_assign_4: {
options = {
evaluate: true,
reduce_vars: true,
sequences: true,
side_effects: true,
unused: true,
}
input: {
!function a() {
a = 2;
console.log(a);
}();
}
expect: {
!function a() {
a = 2,
console.log(a);
}();
}
}
var_assign_5: {
options = {
evaluate: true,
reduce_vars: true,
sequences: true,
side_effects: true,
unused: true,
}
input: {
!function() {
var a;
!function(b) {
a = 2;
console.log(a, b);
}(a);
}();
}
expect: {
!function() {
var a;
!function(b) {
a = 2,
console.log(a, b);
}(a);
}();
}
expect_stdout: "2 undefined"
}
immutable: {
options = {
evaluate: true,
reduce_vars: true,
unused: true,
}
input: {
!function() {
var a = "test";
console.log(a.indexOf("e"));
}();
}
expect: {
!function() {
console.log("test".indexOf("e"));
}();
}
expect_stdout: "1"
}
issue_1814_1: {
options = {
evaluate: true,