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improve reduce_vars and fix a bug

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- update modified flag between compress() passes
- support IIFE arguments
- fix corner case with multiple definitions

closes #1473
This commit is contained in:
alexlamsl
2017-02-18 19:19:55 +08:00
parent b8b133d91a
commit a0f4fd390a
3 changed files with 161 additions and 30 deletions
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124
test/compress/reduce_vars.js
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@@ -108,8 +108,6 @@ modified: {
}
console.log(a + b);
console.log(b + c);
// TODO: as "modified" is determined in "figure_out_scope",
// even "passes" wouldn't improve this any further
console.log(a + c);
console.log(a + b + c);
}
@@ -350,3 +348,125 @@ unsafe_evaluate_equality: {
}
}
}
passes: {
options = {
conditionals: true,
evaluate: true,
passes: 2,
reduce_vars: true,
unused: true,
}
input: {
function f() {
var a = 1, b = 2, c = 3;
if (a) {
b = c;
} else {
c = b;
}
console.log(a + b);
console.log(b + c);
console.log(a + c);
console.log(a + b + c);
}
}
expect: {
function f() {
var b = 2, c = 3;
b = c;
console.log(1 + b);
console.log(b + 3);
console.log(4);
console.log(1 + b + 3);
}
}
}
iife: {
options = {
evaluate: true,
reduce_vars: true,
}
input: {
!function(a, b, c) {
b++;
console.log(a - 1, b * 1, c + 2);
}(1, 2, 3);
}
expect: {
!function(a, b, c) {
b++;
console.log(0, 1 * b, 5);
}(1, 2, 3);
}
}
iife_new: {
options = {
evaluate: true,
reduce_vars: true,
}
input: {
var A = new function(a, b, c) {
b++;
console.log(a - 1, b * 1, c + 2);
}(1, 2, 3);
}
expect: {
var A = new function(a, b, c) {
b++;
console.log(0, 1 * b, 5);
}(1, 2, 3);
}
}
multi_def: {
options = {
evaluate: true,
reduce_vars: true,
}
input: {
function f(a) {
if (a)
var b = 1;
else
var b = 2
console.log(b + 1);
}
}
expect: {
function f(a) {
if (a)
var b = 1;
else
var b = 2
console.log(b + 1);
}
}
}
multi_def_2: {
options = {
evaluate: true,
reduce_vars: true,
}
input: {
if (code == 16)
var bitsLength = 2, bitsOffset = 3, what = len;
else if (code == 17)
var bitsLength = 3, bitsOffset = 3, what = (len = 0);
else if (code == 18)
var bitsLength = 7, bitsOffset = 11, what = (len = 0);
var repeatLength = this.getBits(bitsLength) + bitsOffset;
}
expect: {
if (16 == code)
var bitsLength = 2, bitsOffset = 3, what = len;
else if (17 == code)
var bitsLength = 3, bitsOffset = 3, what = (len = 0);
else if (18 == code)
var bitsLength = 7, bitsOffset = 11, what = (len = 0);
var repeatLength = this.getBits(bitsLength) + bitsOffset;
}
}