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support safe reassignments in reduce_vars (#1823)

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`var a=1;a=2;x(a)` => `x(2)`

fix pre-existing issues
- reference counting on assignment
- walking of anonymous functions
- chained assignment
This commit is contained in:
Alex Lam S.L
2017-04-18 13:38:42 +08:00
committed by GitHub
parent d1aa09c5c7
commit 5d9f1da3ab
3 changed files with 145 additions and 30 deletions
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22
test/compress/collapse_vars.js
View File

@@ -1592,3 +1592,25 @@ var_side_effects_3: {
}
expect_stdout: true
}
reduce_vars_assign: {
options = {
collapse_vars: true,
reduce_vars: true,
}
input: {
!function() {
var a = 1;
a = [].length,
console.log(a);
}();
}
expect: {
!function() {
var a = 1;
a = [].length,
console.log(a);
}();
}
expect_stdout: "0"
}

102
test/compress/reduce_vars.js
View File

@@ -66,7 +66,7 @@ modified: {
conditionals : true,
evaluate : true,
reduce_vars : true,
unused : true
unused : true,
}
input: {
function f0() {
@@ -136,12 +136,11 @@ modified: {
}
function f2() {
var b = 2;
b = 3;
console.log(1 + b);
console.log(b + 3);
3;
console.log(4);
console.log(1 + b + 3);
console.log(6);
console.log(4);
console.log(7);
}
function f3() {
@@ -375,12 +374,11 @@ passes: {
}
expect: {
function f() {
var b = 2;
b = 3;
console.log(1 + b);
console.log(b + 3);
3;
console.log(4);
console.log(1 + b + 3);
console.log(6);
console.log(4);
console.log(7);
}
}
}
@@ -573,7 +571,7 @@ inner_var_label: {
}
}
inner_var_for: {
inner_var_for_1: {
options = {
evaluate: true,
reduce_vars: true,
@@ -602,6 +600,29 @@ inner_var_for: {
}
}
inner_var_for_2: {
options = {
evaluate: true,
reduce_vars: true,
unused: true,
}
input: {
!function() {
var a = 1;
for (var b = 1; --b;) var a = 2;
console.log(a);
}();
}
expect: {
!function() {
a = 1;
for (var b = 1; --b;) var a = 2;
console.log(a);
}();
}
expect_stdout: "1"
}
inner_var_for_in_1: {
options = {
evaluate: true,
@@ -1828,10 +1849,7 @@ redefine_farg_3: {
console.log(function(a) {
var a;
return typeof a;
}([]), "number", function(a) {
var a = void 0;
return typeof a;
}([]));
}([]), "number", "undefined");
}
expect_stdout: "object number undefined"
}
@@ -2115,6 +2133,27 @@ var_assign_5: {
expect_stdout: "2 undefined"
}
var_assign_6: {
options = {
evaluate: true,
reduce_vars: true,
unused: true,
}
input: {
!function() {
var a = function(){}(a = 1);
console.log(a);
}();
}
expect: {
!function() {
var a = function(){}(a = 1);
console.log(a);
}();
}
expect_stdout: "undefined"
}
immutable: {
options = {
evaluate: true,
@@ -2263,3 +2302,34 @@ cond_assign: {
}
expect_stdout: "undefined"
}
iife_assign: {
options = {
evaluate: true,
reduce_vars: true,
unused: true,
}
input: {
!function() {
var a = 1, b = 0;
!function() {
b++;
return;
a = 2;
}();
console.log(a);
}();
}
expect: {
!function() {
var a = 1, b = 0;
!function() {
b++;
return;
a = 2;
}();
console.log(a);
}();
}
expect_stdout: "1"
}