| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
| * in compliance with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software distributed under the License |
| * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
| * or implied. See the License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.dev.jjs.impl; |
| |
| import com.google.gwt.dev.jjs.ast.JMethod; |
| import com.google.gwt.dev.jjs.ast.JProgram; |
| |
| /** |
| * Test for {@link MethodInliner}. |
| */ |
| public class MethodInlinerTest extends OptimizerTestBase { |
| @Override |
| protected void setUp() throws Exception { |
| super.setUp(); |
| } |
| |
| public void testNoMethodCall() throws Exception { |
| addSnippetClassDecl("static int fun1(int a) { return a; }"); |
| addSnippetClassDecl("static int fun2(int a, int b) { return a + b; }"); |
| Result result = optimize("void", ""); |
| assertEquals("static int fun1(int a){\n" + " return a;\n}", |
| result.findMethod("fun1").toSource()); |
| assertEquals("static int fun2(int a, int b){\n" + " return a + b;\n}", |
| result.findMethod("fun2").toSource()); |
| } |
| |
| public void testSimple() throws Exception { |
| addSnippetClassDecl("static int fun1(int a) { return a; }"); |
| addSnippetClassDecl("static int fun2(int a, int b) { return a + b; }"); |
| addSnippetClassDecl("static int fun3(int a) { return 1 + fun1(a); }"); |
| addSnippetClassDecl("static int fun4() {", " int a = 1;", " int b = 2;", |
| " return fun1(a) + fun2(a, b); }"); |
| Result result = optimize("int", "return fun3(1) + fun4();"); |
| |
| // one method call in caller |
| assertEquals("static int fun3(int a){\n" + " return 1 + a;\n" + "}", |
| result.findMethod("fun3").toSource()); |
| |
| // two method calls in caller |
| assertEquals( |
| "static int fun4(){\n" + " int a = 1;\n" + " int b = 2;\n" + " return a + a + b;\n}", |
| result.findMethod("fun4").toSource()); |
| } |
| |
| public void testLargerMethodBody() throws Exception { |
| addSnippetClassDecl("static void fun0(int a) { int b = a; b++; assert(b>0); }"); |
| addSnippetClassDecl("static int fun1(int a) { fun0(a); return 2 + a; }"); |
| addSnippetClassDecl("static int fun2(int a) { return 1 + fun1(a); }"); |
| addSnippetClassDecl("static int fun3() {", " int a = 1;", " int b = 2;", " a = a + fun1(a);", |
| " return a + fun1(b); }"); |
| Result result = optimize("int", "return fun2(1);"); |
| assertEquals( |
| "static int fun1(int a){\n" + " EntryPoint.fun0(a);\n" + " return 2 + a;\n" + "}", |
| result.findMethod("fun1").toSource()); |
| // one method call in caller |
| assertEquals("static int fun2(int a){\n" + " return (EntryPoint.fun0(a), 1 + 2 + a);\n}", |
| result.findMethod("fun2").toSource()); |
| |
| // two method calls in caller |
| assertEquals("static int fun3(){\n" + " int a = 1;\n" + " int b = 2;\n" |
| + " a = a + ((EntryPoint.fun0(a), 2 + a));\n" |
| + " return a + ((EntryPoint.fun0(b), 2 + b));\n}", result.findMethod("fun3").toSource()); |
| } |
| |
| public void testMoreCallSequences() throws Exception { |
| addSnippetClassDecl("static int fun1(int a) { return a; }"); |
| addSnippetClassDecl("static int fun2(int a) { return fun1(a)+1; }"); |
| addSnippetClassDecl("static int fun3(int a) { return fun2(a) + 2; }"); |
| addSnippetClassDecl("static int fun4(int a) { return fun3(a) + 3; }"); |
| Result result = optimize("int", "return fun4(1);"); |
| assertEquals("static int fun2(int a){\n" + " return a + 1;\n}", |
| result.findMethod("fun2").toSource()); |
| assertEquals("static int fun3(int a){\n" + " return a + 1 + 2;\n}", |
| result.findMethod("fun3").toSource()); |
| assertEquals("static int fun4(int a){\n" + " return a + 1 + 2 + 3;\n}", |
| result.findMethod("fun4").toSource()); |
| } |
| |
| public void testDeadCodeElimination_notInlinable() throws Exception { |
| // fun1 cannot be inlined |
| addSnippetClassDecl("static boolean test1(int a)" + "{ return a>1; }"); |
| addSnippetClassDecl("static int fun1(int a)" + "{ if (test1(a)) { return a; }" |
| + "else {switch(a) { case 1: a++; break; default: a=a+2; break; }; return a; }" + "}"); |
| addSnippetClassDecl("static int fun2(int a)" + "{return fun1(a);}"); |
| Result result = optimize("int", "return fun2(0);"); |
| assertEquals("static int fun1(int a){\n" + " if (a > 1) {\n" + " return a;\n" |
| + " } else {\n" + " switch (a) {\n" + " case 1: \n" + " ++a;\n" |
| + " break;\n" + " default: \n" + " a = a + 2;\n" + " }\n" |
| + " return a;\n" + " }\n" + "}", result.findMethod("fun1").toSource()); |
| assertEquals("static int fun2(int a){\n" + " return EntryPoint.fun1(a);\n" + "}", |
| result.findMethod("fun2").toSource()); |
| } |
| |
| public void testDeadCodeElimination_delayedInline() throws Exception { |
| // same fun1() and fun2() as the previous test, but different test1(); |
| // fun1 can be inlined after inling test1 and DeadCodeElimination |
| addSnippetClassDecl("static boolean test1(int a)" + "{ return true; }"); |
| addSnippetClassDecl("static int fun1(int a)" + "{ if (test1(a)) { return a; }" |
| + "else {switch(a) { case 1: a++; break; default: a=a+2; break; }; return a; }" + "}"); |
| addSnippetClassDecl("static int fun2(int a)" + "{return fun1(a);}"); |
| Result result = optimize("int", "return fun2(0);"); |
| assertEquals("static int fun1(int a){\n" + " return a;\n}", |
| result.findMethod("fun1").toSource()); |
| assertEquals("static int fun2(int a){\n" + " return a;\n}", |
| result.findMethod("fun2").toSource()); |
| } |
| |
| public void testRecursion1() throws Exception { |
| // one recursive function, and one call to the function |
| addSnippetClassDecl("static int fun1(int a) { return a<=0 ? a : fun1(a-1)+a; }"); |
| addSnippetClassDecl("static int fun2(int b) { return b + fun1(b); }"); |
| Result result = optimize("int", "return fun2(5);"); |
| assertEquals( |
| "static int fun1(int a){\n" + " return a <= 0 ? a : EntryPoint.fun1(a - 1) + a;\n" + "}", |
| result.findMethod("fun1").toSource()); |
| // never inline a recursive function |
| assertEquals("static int fun2(int b){\n" + " return b + EntryPoint.fun1(b);\n" + "}", |
| result.findMethod("fun2").toSource()); |
| } |
| |
| public void testRecursion2() throws Exception { |
| // one call inside a recursive function |
| addSnippetClassDecl("static int fun1(int a) { return a + 1; }"); |
| addSnippetClassDecl("static int fun2(int b) { return b<=0 ? fun1(b) : fun2(b-1)+b; }"); |
| Result result = optimize("int", "return fun2(5);"); |
| // recursive function can inline other functions |
| assertEquals("static int fun2(int b){\n" |
| + " return b <= 0 ? b + 1 : EntryPoint.fun2(b - 1) + b;\n" + "}", |
| result.findMethod("fun2").toSource()); |
| } |
| |
| public void testRecursion3() throws Exception { |
| // nested recursive call |
| addSnippetClassDecl("static int fun1(int a) { return a<=0 ? a : fun2(a-1)+a; }"); |
| addSnippetClassDecl("static int fun2(int a) { return a<=0 ? a : fun1(a-1)+a; }"); |
| Result result = optimize("int", "return fun1(0);"); |
| assertEquals("static int fun1(int a){\n" |
| + " return a <= 0 ? a : (a - 1 <= 0 ? a - 1 : EntryPoint.fun1(a - 1 - 1) + a - 1) + a;\n" |
| + "}", result.findMethod("fun1").toSource()); |
| assertEquals( |
| "static int fun2(int a){\n" + " return a <= 0 ? a : EntryPoint.fun1(a - 1) + a;\n" + "}", |
| result.findMethod("fun2").toSource()); |
| } |
| |
| @Override |
| protected boolean optimizeMethod(JProgram program, JMethod method) { |
| program.addEntryMethod(findMainMethod(program)); |
| boolean didChange = false; |
| while (MethodInliner.exec(program).didChange()) { |
| didChange = true; |
| } |
| return didChange; |
| } |
| } |