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fix pure_funcs & improve side_effects

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- only drops side-effect-free arguments
- drop side-effect-free parts with discarded value from `AST_Seq` & `AST_SimpleStatement`

closes #1494
This commit is contained in:
alexlamsl
2017-02-20 01:46:59 +08:00
parent 8898b8a0fe
commit 26fbeece1c
3 changed files with 516 additions and 15 deletions
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295
test/compress/pure_funcs.js Normal file
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@@ -0,0 +1,295 @@
array: {
options = {
pure_funcs: [ "Math.floor" ],
side_effects: true,
}
input: {
var a;
function f(b) {
Math.floor(a / b);
Math.floor(c / b);
}
}
expect: {
var a;
function f(b) {
c;
}
}
}
func: {
options = {
pure_funcs: function(node) {
return !~node.args[0].print_to_string().indexOf("a");
},
side_effects: true,
}
input: {
function f(a, b) {
Math.floor(a / b);
Math.floor(c / b);
}
}
expect: {
function f(a, b) {
Math.floor(c / b);
}
}
}
side_effects: {
options = {
pure_funcs: [ "console.log" ],
side_effects: true,
}
input: {
function f(a, b) {
console.log(a());
console.log(b);
}
}
expect: {
function f(a, b) {
a();
}
}
}
unused: {
options = {
pure_funcs: [ "pure" ],
side_effects: true,
unused: true,
}
input: {
function foo() {
var u = pure(1);
var x = pure(2);
var y = pure(x);
var z = pure(pure(side_effects()));
return pure(3);
}
}
expect: {
function foo() {
side_effects();
return pure(3);
}
}
}
babel: {
options = {
pure_funcs: [ "_classCallCheck" ],
side_effects: true,
unused: true,
}
input: {
function _classCallCheck(instance, Constructor) {
if (!(instance instanceof Constructor))
throw new TypeError("Cannot call a class as a function");
}
var Foo = function Foo() {
_classCallCheck(this, Foo);
};
}
expect: {
function _classCallCheck(instance, Constructor) {
if (!(instance instanceof Constructor))
throw new TypeError("Cannot call a class as a function");
}
var Foo = function() {
};
}
}
conditional: {
options = {
pure_funcs: [ "pure" ],
side_effects: true,
}
input: {
pure(1 | a() ? 2 & b() : 7 ^ c());
pure(1 | a() ? 2 & b() : 5);
pure(1 | a() ? 4 : 7 ^ c());
pure(1 | a() ? 4 : 5);
pure(3 ? 2 & b() : 7 ^ c());
pure(3 ? 2 & b() : 5);
pure(3 ? 4 : 7 ^ c());
pure(3 ? 4 : 5);
}
expect: {
1 | a() ? b() : c();
1 | a() && b();
1 | a() || c();
a();
3 ? b() : c();
3 && b();
3 || c();
}
}
relational: {
options = {
pure_funcs: [ "foo" ],
side_effects :true,
}
input: {
foo() in foo();
foo() instanceof bar();
foo() < "bar";
bar() > foo();
bar() != bar();
bar() !== "bar";
"bar" == foo();
"bar" === bar();
"bar" >= "bar";
}
expect: {
bar();
bar();
bar(), bar();
bar();
bar();
}
}
arithmetic: {
options = {
pure_funcs: [ "foo" ],
side_effects :true,
}
input: {
foo() + foo();
foo() - bar();
foo() * "bar";
bar() / foo();
bar() & bar();
bar() | "bar";
"bar" >> foo();
"bar" << bar();
"bar" >>> "bar";
}
expect: {
bar();
bar();
bar(), bar();
bar();
bar();
}
}
boolean_and: {
options = {
pure_funcs: [ "foo" ],
side_effects :true,
}
input: {
foo() && foo();
foo() && bar();
foo() && "bar";
bar() && foo();
bar() && bar();
bar() && "bar";
"bar" && foo();
"bar" && bar();
"bar" && "bar";
}
expect: {
foo() && bar();
bar();
bar() && bar();
bar();
"bar" && bar();
}
}
boolean_or: {
options = {
pure_funcs: [ "foo" ],
side_effects :true,
}
input: {
foo() || foo();
foo() || bar();
foo() || "bar";
bar() || foo();
bar() || bar();
bar() || "bar";
"bar" || foo();
"bar" || bar();
"bar" || "bar";
}
expect: {
foo() || bar();
bar();
bar() || bar();
bar();
"bar" || bar();
}
}
assign: {
options = {
pure_funcs: [ "foo" ],
side_effects :true,
}
input: {
var a;
function f(b) {
a = foo();
b *= 4 + foo();
c >>= 0 | foo();
}
}
expect: {
var a;
function f(b) {
a = foo();
b *= 4 + foo();
c >>= 0 | foo();
}
}
}
unary: {
options = {
pure_funcs: [ "foo" ],
side_effects :true,
}
input: {
typeof foo();
typeof bar();
typeof "bar";
void foo();
void bar();
void "bar";
delete a[foo()];
delete a[bar()];
delete a["bar"];
a[foo()]++;
a[bar()]++;
a["bar"]++;
--a[foo()];
--a[bar()];
--a["bar"];
~foo();
~bar();
~"bar";
}
expect: {
bar();
bar();
delete a[foo()];
delete a[bar()];
delete a["bar"];
a[foo()]++;
a[bar()]++;
a["bar"]++;
--a[foo()];
--a[bar()];
--a["bar"];
bar();
}
}