463 lines
15 KiB
Java
463 lines
15 KiB
Java
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/*
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* Copyright 2008 The Closure Compiler Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.javascript.jscomp;
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/**
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* Test for {@link UnreachableCodeElimination}.
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*
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*/
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public class UnreachableCodeEliminationTest extends CompilerTestCase {
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private boolean removeNoOpStatements = true;
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@Override
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protected CompilerPass getProcessor(Compiler compiler) {
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return new UnreachableCodeElimination(compiler, removeNoOpStatements);
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}
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@Override public void setUp() throws Exception {
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super.setUp();
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removeNoOpStatements = true;
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}
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public void testRemoveUnreachableCode() {
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// switch statement with stuff after "return"
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test("function foo(){switch(foo){case 1:x=1;return;break;" +
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"case 2:{x=2;return;break}default:}}",
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"function foo(){switch(foo){case 1:x=1;return;" +
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"case 2:{x=2}default:}}");
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// if/else statements with returns
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test("function bar(){if(foo)x=1;else if(bar){return;x=2}" +
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"else{x=3;return;x=4}return 5;x=5}",
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"function bar(){if(foo)x=1;else if(bar){return}" +
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"else{x=3;return}return 5}");
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// if statements without blocks
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test("function foo(){if(x==3)return;x=4;y++;while(y==4){return;x=3}}",
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"function foo(){if(x==3)return;x=4;y++;while(y==4){return}}");
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// for/do/while loops
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test("function baz(){for(i=0;i<n;i++){x=3;break;x=4}" +
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"do{x=2;break;x=4}while(x==4);" +
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"while(i<4){x=3;return;x=6}}",
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"function baz(){for(i=0;i<n;){x=3;break}" +
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"do{x=2;break}while(x==4);" +
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"while(i<4){x=3;return}}");
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// return statements on the same level as conditionals
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test("function foo(){if(x==3){return}return 5;while(y==4){x++;return;x=4}}",
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"function foo(){if(x==3){return}return 5}");
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// return statements on the same level as conditionals
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test("function foo(){return 3;for(;y==4;){x++;return;x=4}}",
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"function foo(){return 3}");
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// try/catch statements
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test("function foo(){try{x=3;return x+1;x=5}catch(e){x=4;return 5;x=5}}",
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"function foo(){try{x=3;return x+1}catch(e){x=4;return 5}}");
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// try/finally statements
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test("function foo(){try{x=3;return x+1;x=5}finally{x=4;return 5;x=5}}",
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"function foo(){try{x=3;return x+1}finally{x=4;return 5}}");
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// try/catch/finally statements
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test("function foo(){try{x=3;return x+1;x=5}catch(e){x=3;return;x=2}" +
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"finally{x=4;return 5;x=5}}",
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"function foo(){try{x=3;return x+1}catch(e){x=3;return}" +
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"finally{x=4;return 5}}");
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// test a combination of blocks
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test("function foo(){x=3;if(x==4){x=5;return;x=6}else{x=7}return 5;x=3}",
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"function foo(){x=3;if(x==4){x=5;return}else{x=7}return 5}");
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// test removing multiple statements
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test("function foo() { return 1; var x = 2; var y = 10; return 2;}",
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"function foo() { var y; var x; return 1}");
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test("function foo() { return 1; x = 2; y = 10; return 2;}",
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"function foo(){ return 1}");
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}
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public void testRemoveUselessNameStatements() {
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test("a;", "");
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test("a.b;", "");
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test("a.b.MyClass.prototype.memberName;", "");
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}
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public void testRemoveUselessStrings() {
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test("'a';", "");
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}
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public void testNoRemoveUseStrict() {
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test("'use strict';", "'use strict'");
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}
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public void testNoRemoveUselessNameStatements() {
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removeNoOpStatements = false;
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testSame("a;");
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testSame("a.b;");
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testSame("a.b.MyClass.prototype.memberName;");
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}
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public void testRemoveDo() {
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test("do { print(1); break } while(1)", "do { print(1); break } while(1)");
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test("while(1) { break; do { print(1); break } while(1) }",
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"while(1) { break; do {} while(1) }");
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}
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public void testRemoveUselessLiteralValueStatements() {
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test("true;", "");
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test("'hi';", "");
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test("if (x) 1;", "");
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test("while (x) 1;", "while (x);");
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test("do 1; while (x);", "do ; while (x);");
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test("for (;;) 1;", "for (;;);");
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test("switch(x){case 1:true;case 2:'hi';default:true}",
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"switch(x){case 1:case 2:default:}");
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}
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public void testConditionalDeadCode() {
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test("function f() { if (1) return 5; else return 5; x = 1}",
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"function f() { if (1) return 5; else return 5; }");
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}
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public void testSwitchCase() {
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test("function f() { switch(x) { default: return 5; foo()}}",
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"function f() { switch(x) { default: return 5;}}");
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test("function f() { switch(x) { default: return; case 1: foo(); bar()}}",
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"function f() { switch(x) { default: return; case 1: foo(); bar()}}");
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test("function f() { switch(x) { default: return; case 1: return 5;bar()}}",
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"function f() { switch(x) { default: return; case 1: return 5;}}");
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}
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public void testTryCatchFinally() {
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testSame("try {foo()} catch (e) {bar()}");
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testSame("try { try {foo()} catch (e) {bar()}} catch (x) {bar()}");
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test("try {var x = 1} catch (e) {e()}", "try {var x = 1} finally {}");
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test("try {var x = 1} catch (e) {e()} finally {x()}",
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" try {var x = 1} finally {x()}");
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test("try {var x = 1} catch (e) {e()} finally {}",
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"try {var x = 1} finally {}");
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testSame("try {var x = 1} finally {x()}");
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testSame("try {var x = 1} finally {}");
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test("function f() {return; try{var x = 1}catch(e){} }",
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"function f() {var x;}");
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}
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public void testRemovalRequiresRedeclaration() {
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test("while(1) { break; var x = 1}", "var x; while(1) { break } ");
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test("while(1) { break; var x=1; var y=1}",
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"var y; var x; while(1) { break } ");
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}
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public void testAssignPropertyOnCreatedObject() {
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testSame("this.foo = 3;");
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testSame("a.foo = 3;");
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testSame("bar().foo = 3;");
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testSame("({}).foo = bar();");
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testSame("(new X()).foo = 3;");
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test("({}).foo = 3;", "");
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test("(function() {}).prototype.toString = function(){};", "");
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test("(function() {}).prototype['toString'] = function(){};", "");
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test("(function() {}).prototype[f] = function(){};", "");
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}
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public void testUselessUnconditionalReturn() {
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test("function foo() { return }", " function foo() { }");
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test("function foo() { return; return; x=1 }", "function foo() { }");
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test("function foo() { return; return; var x=1}", "function foo() {var x}");
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test("function foo() { return; function bar() {} }",
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"function foo() { function bar() {} }" );
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testSame("function foo() { return 5 }");
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test("function f() {switch (a) { case 'a': return}}",
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"function f() {switch (a) { case 'a': }}");
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testSame("function f() {switch (a) { case 'a': case foo(): }}");
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testSame("function f() {switch (a) {" +
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" default: return; case 'a': alert(1)}}");
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testSame("function f() {switch (a) {" +
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" case 'a': return; default: alert(1)}}");
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}
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public void testUnlessUnconditionalContinue() {
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test("for(;1;) {continue}", " for(;1;) {}");
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test("for(;0;) {continue}", " for(;0;) {}");
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testSame("X: for(;1;) { for(;1;) { if (x()) {continue X} x = 1}}");
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test("for(;1;) { X: for(;1;) { if (x()) {continue X} }}",
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"for(;1;) { X: for(;1;) { if (x()) {}}}");
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test("do { continue } while(1);", "do { } while(1);");
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}
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public void testUnlessUnconditonalBreak() {
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test("switch (a) { case 'a': break }", "switch (a) { case 'a': }");
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test("switch (a) { case 'a': break; case foo(): }",
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"switch (a) { case 'a': case foo(): }");
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test("switch (a) { default: break; case 'a': }",
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"switch (a) { default: case 'a': }");
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testSame("switch (a) { case 'a': alert(a); break; default: alert(a); }");
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testSame("switch (a) { default: alert(a); break; case 'a': alert(a); }");
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test("X: {switch (a) { case 'a': break X}}",
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"X: {switch (a) { case 'a': }}");
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testSame("X: {switch (a) { case 'a': if (a()) {break X} a = 1}}");
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test("X: {switch (a) { case 'a': if (a()) {break X}}}",
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"X: {switch (a) { case 'a': if (a()) {}}}");
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test("X: {switch (a) { case 'a': if (a()) {break X}}}",
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"X: {switch (a) { case 'a': if (a()) {}}}");
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testSame("do { break } while(1);");
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testSame("for(;1;) { break }");
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}
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public void testCascadedRemovalOfUnlessUnconditonalJumps() {
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test("switch (a) { case 'a': break; case 'b': break; case 'c': break }",
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"switch (a) { case 'a': break; case 'b': case 'c': }");
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// Only one break removed per pass.
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test("switch (a) { case 'a': break; case 'b': case 'c': }",
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"switch (a) { case 'a': case 'b': case 'c': }");
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test("function foo() {" +
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" switch (a) { case 'a':return; case 'b':return; case 'c':return }}",
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"function foo() { switch (a) { case 'a':return; case 'b': case 'c': }}");
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test("function foo() {" +
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" switch (a) { case 'a':return; case 'b': case 'c': }}",
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"function foo() { switch (a) { case 'a': case 'b': case 'c': }}");
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testSame("function foo() {" +
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"switch (a) { case 'a':return 2; case 'b':return 1}}");
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}
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public void testIssue311() {
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test("function a(b) {\n" +
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" switch (b.v) {\n" +
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" case 'SWITCH':\n" +
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" if (b.i >= 0) {\n" +
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" return b.o;\n" +
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" } else {\n" +
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" return;\n" +
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" }\n" +
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" break;\n" +
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" }\n" +
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"}",
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"function a(b) {\n" +
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" switch (b.v) {\n" +
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" case 'SWITCH':\n" +
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" if (b.i >= 0) {\n" +
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" return b.o;\n" +
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" } else {\n" +
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" }\n" +
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" }\n" +
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"}");
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}
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public void testIssue4177428a() {
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test(
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"f = function() {\n" +
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" var action;\n" +
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" a: {\n" +
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" var proto = null;\n" +
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" try {\n" +
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" proto = new Proto\n" +
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" } finally {\n" +
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" action = proto;\n" +
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" break a\n" + // Remove this...
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" }\n" +
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" }\n" +
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" alert(action)\n" + // but not this.
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"};",
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"f = function() {\n" +
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" var action;\n" +
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" a: {\n" +
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" var proto = null;\n" +
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" try {\n" +
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" proto = new Proto\n" +
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" } finally {\n" +
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" action = proto;\n" +
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" }\n" +
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" }\n" +
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" alert(action)\n" + // but not this.
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"};"
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);
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}
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public void testIssue4177428b() {
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test(
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"f = function() {\n" +
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" var action;\n" +
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" a: {\n" +
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" var proto = null;\n" +
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" try {\n" +
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" try {\n" +
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" proto = new Proto\n" +
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" } finally {\n" +
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" action = proto;\n" +
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" break a\n" + // Remove this...
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" }\n" +
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" } finally {\n" +
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" }\n" +
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" }\n" +
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" alert(action)\n" + // but not this.
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"};",
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"f = function() {\n" +
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" var action;\n" +
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" a: {\n" +
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" var proto = null;\n" +
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" try {\n" +
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" try {\n" +
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" proto = new Proto\n" +
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" } finally {\n" +
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" action = proto;\n" +
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" break a\n" + // Remove this...
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" }\n" +
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" } finally {\n" +
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" }\n" +
|
||
|
|
" }\n" +
|
||
|
|
" alert(action)\n" + // but not this.
|
||
|
|
"};"
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
public void testIssue4177428c() {
|
||
|
|
test(
|
||
|
|
"f = function() {\n" +
|
||
|
|
" var action;\n" +
|
||
|
|
" a: {\n" +
|
||
|
|
" var proto = null;\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" proto = new Proto\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" action = proto;\n" +
|
||
|
|
" break a\n" + // Remove this...
|
||
|
|
" }\n" +
|
||
|
|
" }\n" +
|
||
|
|
" }\n" +
|
||
|
|
" alert(action)\n" + // but not this.
|
||
|
|
"};",
|
||
|
|
"f = function() {\n" +
|
||
|
|
" var action;\n" +
|
||
|
|
" a: {\n" +
|
||
|
|
" var proto = null;\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" proto = new Proto\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" action = proto;\n" +
|
||
|
|
" }\n" +
|
||
|
|
" }\n" +
|
||
|
|
" }\n" +
|
||
|
|
" alert(action)\n" + // but not this.
|
||
|
|
"};"
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
public void testIssue4177428_continue() {
|
||
|
|
test(
|
||
|
|
"f = function() {\n" +
|
||
|
|
" var action;\n" +
|
||
|
|
" a: do {\n" +
|
||
|
|
" var proto = null;\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" proto = new Proto\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" action = proto;\n" +
|
||
|
|
" continue a\n" + // Remove this...
|
||
|
|
" }\n" +
|
||
|
|
" } while(false)\n" +
|
||
|
|
" alert(action)\n" + // but not this.
|
||
|
|
"};",
|
||
|
|
"f = function() {\n" +
|
||
|
|
" var action;\n" +
|
||
|
|
" a: do {\n" +
|
||
|
|
" var proto = null;\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" proto = new Proto\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" action = proto;\n" +
|
||
|
|
" }\n" +
|
||
|
|
" } while (false)\n" +
|
||
|
|
" alert(action)\n" +
|
||
|
|
"};"
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
public void testIssue4177428_return() {
|
||
|
|
test(
|
||
|
|
"f = function() {\n" +
|
||
|
|
" var action;\n" +
|
||
|
|
" a: {\n" +
|
||
|
|
" var proto = null;\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" proto = new Proto\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" action = proto;\n" +
|
||
|
|
" return\n" + // Remove this...
|
||
|
|
" }\n" +
|
||
|
|
" }\n" +
|
||
|
|
" alert(action)\n" + // and this.
|
||
|
|
"};",
|
||
|
|
"f = function() {\n" +
|
||
|
|
" var action;\n" +
|
||
|
|
" a: {\n" +
|
||
|
|
" var proto = null;\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" proto = new Proto\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" action = proto;\n" +
|
||
|
|
" }\n" +
|
||
|
|
" }\n" +
|
||
|
|
"};"
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
public void testIssue4177428_multifinally() {
|
||
|
|
testSame(
|
||
|
|
"a: {\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" try {\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" break a;\n" +
|
||
|
|
" }\n" +
|
||
|
|
" } finally {\n" +
|
||
|
|
" x = 1;\n" +
|
||
|
|
" }\n" +
|
||
|
|
"}");
|
||
|
|
}
|
||
|
|
|
||
|
|
public void testIssue5215541_deadVarDeclar() {
|
||
|
|
testSame("throw 1; var x");
|
||
|
|
testSame("throw 1; function x() {}");
|
||
|
|
testSame("throw 1; var x; var y;");
|
||
|
|
test("throw 1; var x = foo", "var x; throw 1");
|
||
|
|
}
|
||
|
|
|
||
|
|
public void testForInLoop() {
|
||
|
|
testSame("for(var x in y) {}");
|
||
|
|
}
|
||
|
|
}
|