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improve collapsible value detection (#1638)

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- #1634 bars variables with cross-scope references in between to collapse
- but if assigned value is side-effect-free, no states can be modified, so it is safe to move
This commit is contained in:
Alex Lam S.L
2017-03-24 02:55:32 +08:00
committed by GitHub
parent 6b2f34769a
commit e918748d88
3 changed files with 73 additions and 3 deletions
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68
test/compress/collapse_vars.js
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@@ -1522,3 +1522,71 @@ issue_1631_3: {
}
expect_stdout: "6"
}
var_side_effects_1: {
options = {
collapse_vars: true,
}
input: {
var print = console.log.bind(console);
function foo(x) {
var twice = x * 2;
print('Foo:', twice);
}
foo(10);
}
expect: {
var print = console.log.bind(console);
function foo(x) {
print('Foo:', 2 * x);
}
foo(10);
}
expect_stdout: true
}
var_side_effects_2: {
options = {
collapse_vars: true,
}
input: {
var print = console.log.bind(console);
function foo(x) {
var twice = x.y * 2;
print('Foo:', twice);
}
foo({ y: 10 });
}
expect: {
var print = console.log.bind(console);
function foo(x) {
var twice = 2 * x.y;
print('Foo:', twice);
}
foo({ y: 10 });
}
expect_stdout: true
}
var_side_effects_3: {
options = {
collapse_vars: true,
pure_getters: true,
}
input: {
var print = console.log.bind(console);
function foo(x) {
var twice = x.y * 2;
print('Foo:', twice);
}
foo({ y: 10 });
}
expect: {
var print = console.log.bind(console);
function foo(x) {
print('Foo:', 2 * x.y);
}
foo({ y: 10 });
}
expect_stdout: true
}