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Optimize unmodified variables

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This commit is contained in:
alexlamsl
2016-09-20 22:23:27 +08:00
committed by Richard van Velzen
parent 0111497fc9
commit 4761d07e0b
4 changed files with 184 additions and 5 deletions
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171
test/compress/reduce_vars.js Normal file
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@@ -0,0 +1,171 @@
reduce_vars: {
options = {
conditionals : true,
evaluate : true,
global_defs : {
C : 0
},
reduce_vars : true,
unused : true
}
input: {
var A = 1;
(function f0() {
var a = 2;
console.log(a - 5);
console.log(A - 5);
})();
(function f1() {
var a = 2;
console.log(a - 5);
eval("console.log(a);");
})();
(function f2(eval) {
var a = 2;
console.log(a - 5);
eval("console.log(a);");
})(eval);
(function f3() {
var b = typeof C !== "undefined";
var c = 4;
if (b) {
return 'yes';
} else {
return 'no';
}
})();
console.log(A + 1);
}
expect: {
var A = 1;
(function() {
console.log(-3);
console.log(-4);
})();
(function f1() {
var a = 2;
console.log(-3);
eval("console.log(a);");
})();
(function f2(eval) {
var a = 2;
console.log(-3);
eval("console.log(a);");
})(eval);
(function() {
return "yes";
})();
console.log(2);
}
}
modified: {
options = {
conditionals : true,
evaluate : true,
reduce_vars : true,
unused : true
}
input: {
function f0() {
var a = 1, b = 2;
b++;
console.log(a + 1);
console.log(b + 1);
}
function f1() {
var a = 1, b = 2;
--b;
console.log(a + 1);
console.log(b + 1);
}
function f2() {
var a = 1, b = 2, c = 3;
b = c;
console.log(a + b);
console.log(b + c);
console.log(a + c);
console.log(a + b + c);
}
function f3() {
var a = 1, b = 2, c = 3;
b *= c;
console.log(a + b);
console.log(b + c);
console.log(a + c);
console.log(a + b + c);
}
function f4() {
var a = 1, b = 2, c = 3;
if (a) {
b = c;
} else {
c = b;
}
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);
}
function f5(a) {
B = a;
console.log(A ? 'yes' : 'no');
console.log(B ? 'yes' : 'no');
}
}
expect: {
function f0() {
var b = 2;
b++;
console.log(2);
console.log(b + 1);
}
function f1() {
var b = 2;
--b;
console.log(2);
console.log(b + 1);
}
function f2() {
var a = 1, b = 2, c = 3;
b = c;
console.log(a + b);
console.log(b + c);
console.log(4);
console.log(a + b + c);
}
function f3() {
var a = 1, b = 2, c = 3;
b *= c;
console.log(a + b);
console.log(b + c);
console.log(4);
console.log(a + b + c);
}
function f4() {
var a = 1, b = 2, c = 3;
b = c;
console.log(a + b);
console.log(b + c);
console.log(a + c);
console.log(a + b + c);
}
function f5(a) {
B = a;
console.log(A ? 'yes' : 'no');
console.log(B ? 'yes' : 'no');
}
}
}