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perform reduce_vars on safe literals (#2351)

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- constant expression
- single reference
- same scope
- not across loop body
This commit is contained in:
Alex Lam S.L
2017-10-09 12:25:06 +08:00
committed by GitHub
parent 1abe14296e
commit b810e2f8da
5 changed files with 286 additions and 36 deletions
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193
test/compress/reduce_vars.js
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@@ -172,6 +172,7 @@ unsafe_evaluate: {
options = {
evaluate : true,
reduce_vars : true,
side_effects : true,
unsafe : true,
unused : true
}
@@ -1898,10 +1899,7 @@ redefine_farg_3: {
console.log(f([]), g([]), h([]));
}
expect: {
console.log(function(a) {
var a;
return typeof a;
}([]), "number", "undefined");
console.log(typeof [], "number", "undefined");
}
expect_stdout: "object number undefined"
}
@@ -2629,3 +2627,190 @@ for_in_prop: {
}
expect_stdout: "1"
}
obj_var_1: {
options = {
evaluate: true,
passes: 2,
reduce_vars: true,
toplevel: true,
unused: true,
}
input: {
var C = 1;
var obj = {
bar: function() {
return C + C;
}
};
console.log(obj.bar());
}
expect: {
console.log({
bar: function() {
return 2;
}
}.bar());
}
expect_stdout: "2"
}
obj_var_2: {
options = {
evaluate: true,
inline: true,
passes: 2,
reduce_vars: true,
side_effects: true,
toplevel: true,
unsafe: true,
unused: true,
}
input: {
var C = 1;
var obj = {
bar: function() {
return C + C;
}
};
console.log(obj.bar());
}
expect: {
console.log(2);
}
expect_stdout: "2"
}
obj_arg_1: {
options = {
evaluate: true,
inline: true,
passes: 2,
reduce_vars: true,
toplevel: true,
unused: true,
}
input: {
var C = 1;
function f(obj) {
return obj.bar();
}
console.log(f({
bar: function() {
return C + C;
}
}));
}
expect: {
console.log({
bar: function() {
return 2;
}
}.bar());
}
expect_stdout: "2"
}
obj_arg_2: {
options = {
evaluate: true,
inline: true,
passes: 2,
reduce_vars: true,
side_effects: true,
toplevel: true,
unsafe: true,
unused: true,
}
input: {
var C = 1;
function f(obj) {
return obj.bar();
}
console.log(f({
bar: function() {
return C + C;
}
}));
}
expect: {
console.log(2);
}
expect_stdout: "2"
}
func_arg_1: {
options = {
evaluate: true,
inline: true,
passes: 2,
reduce_vars: true,
side_effects: true,
toplevel: true,
unused: true,
}
input: {
var a = 42;
!function(a) {
console.log(a());
}(function() {
return a;
});
}
expect: {
console.log(42);
}
expect_stdout: "42"
}
func_arg_2: {
options = {
evaluate: true,
inline: true,
passes: 2,
reduce_vars: true,
side_effects: true,
toplevel: true,
unused: true,
}
input: {
var a = 42;
!function(a) {
console.log(a());
}(function(a) {
return a;
});
}
expect: {
console.log(void 0);
}
expect_stdout: "undefined"
}
regex_loop: {
options = {
reduce_vars: true,
toplevel: true,
unused: true,
}
input: {
function f(x) {
for (var r, s = "acdabcdeabbb"; r = x().exec(s);)
console.log(r[0]);
}
var a = /ab*/g;
f(function() {
return a;
});
}
expect: {
var a = /ab*/g;
(function(x) {
for (var r, s = "acdabcdeabbb"; r = x().exec(s);)
console.log(r[0]);
})(function() {
return a;
});
}
expect_stdout: true
}