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handle overlapped variable definitions (#1691)

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Process variable definitions with or without assigned values against:
- `arguments`
- named function arguments
- multiple definitions within same scope

Essentially demote variable declarations with no value assignments.

Also fixed invalid use of `AST_VarDef` over `arguments` - should use a member of `AST_SymbolDeclaration` instead.
This commit is contained in:
Alex Lam S.L
2017-03-27 01:30:21 +08:00
committed by GitHub
parent 861a79ac9f
commit 57ce5bd9e0
3 changed files with 314 additions and 24 deletions
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289
test/compress/reduce_vars.js
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@@ -425,7 +425,7 @@ iife_new: {
expect_stdout: true
}
multi_def: {
multi_def_1: {
options = {
evaluate: true,
reduce_vars: true,
@@ -435,7 +435,7 @@ multi_def: {
if (a)
var b = 1;
else
var b = 2
var b = 2;
console.log(b + 1);
}
}
@@ -444,7 +444,7 @@ multi_def: {
if (a)
var b = 1;
else
var b = 2
var b = 2;
console.log(b + 1);
}
}
@@ -479,6 +479,33 @@ multi_def_2: {
}
}
multi_def_3: {
options = {
evaluate: true,
reduce_vars: true,
}
input: {
function f(a) {
var b = 2;
if (a)
var b;
else
var b;
console.log(b + 1);
}
}
expect: {
function f(a) {
var b = 2;
if (a)
var b;
else
var b;
console.log(3);
}
}
}
use_before_var: {
options = {
evaluate: true,
@@ -1571,3 +1598,259 @@ unary_delete: {
}
expect_stdout: true
}
redefine_arguments_1: {
options = {
evaluate: true,
keep_fargs: false,
reduce_vars: true,
unused: true,
}
input: {
function f() {
var arguments;
return typeof arguments;
}
function g() {
var arguments = 42;
return typeof arguments;
}
function h(x) {
var arguments = x;
return typeof arguments;
}
console.log(f(), g(), h());
}
expect: {
function f() {
var arguments;
return typeof arguments;
}
function g() {
return"number";
}
function h(x) {
var arguments = x;
return typeof arguments;
}
console.log(f(), g(), h());
}
expect_stdout: "object number undefined"
}
redefine_arguments_2: {
options = {
evaluate: true,
keep_fargs: false,
reduce_vars: true,
side_effects: true,
toplevel: true,
unused: true,
}
input: {
function f() {
var arguments;
return typeof arguments;
}
function g() {
var arguments = 42;
return typeof arguments;
}
function h(x) {
var arguments = x;
return typeof arguments;
}
console.log(f(), g(), h());
}
expect: {
console.log(function() {
var arguments;
return typeof arguments;
}(), function() {
return"number";
}(), function(x) {
var arguments = x;
return typeof arguments;
}());
}
expect_stdout: "object number undefined"
}
redefine_arguments_3: {
options = {
evaluate: true,
keep_fargs: false,
passes: 3,
reduce_vars: true,
side_effects: true,
toplevel: true,
unused: true,
}
input: {
function f() {
var arguments;
return typeof arguments;
}
function g() {
var arguments = 42;
return typeof arguments;
}
function h(x) {
var arguments = x;
return typeof arguments;
}
console.log(f(), g(), h());
}
expect: {
console.log(function() {
var arguments;
return typeof arguments;
}(), "number", "undefined");
}
expect_stdout: "object number undefined"
}
redefine_farg_1: {
options = {
evaluate: true,
keep_fargs: false,
reduce_vars: true,
unused: true,
}
input: {
function f(a) {
var a;
return typeof a;
}
function g(a) {
var a = 42;
return typeof a;
}
function h(a, b) {
var a = b;
return typeof a;
}
console.log(f([]), g([]), h([]));
}
expect: {
function f(a) {
var a;
return typeof a;
}
function g() {
return"number";
}
function h(a, b) {
var a = b;
return typeof a;
}
console.log(f([]), g([]), h([]));
}
expect_stdout: "object number undefined"
}
redefine_farg_2: {
options = {
evaluate: true,
keep_fargs: false,
reduce_vars: true,
side_effects: true,
toplevel: true,
unused: true,
}
input: {
function f(a) {
var a;
return typeof a;
}
function g(a) {
var a = 42;
return typeof a;
}
function h(a, b) {
var a = b;
return typeof a;
}
console.log(f([]), g([]), h([]));
}
expect: {
console.log(function(a) {
var a;
return typeof a;
}([]), function() {
return "number";
}(),function(a, b) {
var a = b;
return typeof a;
}([]));
}
expect_stdout: "object number undefined"
}
redefine_farg_3: {
options = {
evaluate: true,
keep_fargs: false,
passes: 3,
reduce_vars: true,
side_effects: true,
toplevel: true,
unused: true,
}
input: {
function f(a) {
var a;
return typeof a;
}
function g(a) {
var a = 42;
return typeof a;
}
function h(a, b) {
var a = b;
return typeof a;
}
console.log(f([]), g([]), h([]));
}
expect: {
console.log(function(a) {
var a;
return typeof a;
}([]), "number", function(a) {
var a = void 0;
return typeof a;
}([]));
}
expect_stdout: "object number undefined"
}
delay_def: {
options = {
evaluate: true,
reduce_vars: true,
unused: true,
}
input: {
function f() {
return a;
var a;
}
function g() {
return a;
var a = 1;
}
console.log(f(), g());
}
expect: {
function f() {
return a;
var a;
}
function g() {
return a;
var a = 1;
}
console.log(f(), g());
}
expect_stdout: true
}