| /* |
| * Copyright 2008 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.gflow.constants; |
| |
| import com.google.gwt.core.ext.UnableToCompleteException; |
| import com.google.gwt.dev.jjs.ast.JBlock; |
| import com.google.gwt.dev.jjs.ast.JBooleanLiteral; |
| import com.google.gwt.dev.jjs.ast.JIfStatement; |
| import com.google.gwt.dev.jjs.ast.JMethod; |
| import com.google.gwt.dev.jjs.ast.JMethodBody; |
| import com.google.gwt.dev.jjs.ast.JProgram; |
| import com.google.gwt.dev.jjs.ast.JStatement; |
| import com.google.gwt.dev.jjs.impl.JJSTestBase; |
| import com.google.gwt.dev.jjs.impl.gflow.constants.AssumptionDeducer; |
| import com.google.gwt.dev.jjs.impl.gflow.constants.ConstantsAssumption; |
| import com.google.gwt.dev.jjs.impl.gflow.constants.ConstantsAssumption.Updater; |
| |
| import java.util.List; |
| |
| public class AssumptionsDeducerTest extends JJSTestBase { |
| @Override |
| protected void setUp() throws Exception { |
| super.setUp(); |
| |
| addSnippetClassDecl("static class Foo { " + |
| "public int i;" + |
| "public Object o;" + |
| "}"); |
| } |
| |
| public void testBooleanVar() throws Exception { |
| from("boolean b = false;", "b", true).deduce("{b = true}"); |
| from("boolean b = false;", "b", false).deduce("{b = false}"); |
| } |
| |
| public void testEq() throws Exception { |
| from("int i = 0;", "i == 10", true).deduce("{i = 10}"); |
| from("int i = 0;", "i == 10", false).deduce("T"); |
| } |
| |
| public void testNeq() throws Exception { |
| from("int i = 0;", "i != 10", true).deduce("T"); |
| from("int i = 0;", "i != 10", false).deduce("{i = 10}"); |
| } |
| |
| public void testInstanceof() throws Exception { |
| from("Object o = null;", "o instanceof String", true).deduce("T"); |
| from("Object o = null;", "o instanceof String", false).deduce("T"); |
| } |
| |
| public void testReference() throws Exception { |
| from("String s = null;", "s.length() == 0", true).deduce("T"); |
| from("String s = null;", "s.length() == 0", false).deduce("T"); |
| from("Foo f = null;", "f.o == null", true).deduce("T"); |
| from("Foo f = null;", "f.o == null", false).deduce("T"); |
| } |
| |
| public void testAnd() throws Exception { |
| from("int i = 0; int j = 0;", "i == 10 && j == 11", true).deduce("{i = 10, j = 11}"); |
| from("int i = 0; int j = 0;", "i == 10 && j == 11", false).deduce("T"); |
| } |
| |
| public void testOr() throws Exception { |
| from("int i = 0; int j = 0;", "i != 10 || j != 11", false).deduce("{i = 10, j = 11}"); |
| from("int i = 0; int j = 0;", "i != 10 || j != 11", true).deduce("T"); |
| } |
| |
| public void testFloatEq() throws Exception { |
| from("float f = 0;", "f == 1.0", true).deduce("{f = 1.0}"); |
| // There are positive and negative zeros. Do not deduce anything in here |
| from("float f = 0;", "f == 0.0", true).deduce("T"); |
| } |
| |
| public void testDoubleEq() throws Exception { |
| from("double f = 0;", "f == 1.0", true).deduce("{f = 1.0}"); |
| // There are positive and negative zeros. Do not deduce anything in here |
| from("double f = 0;", "f == 0.0", true).deduce("T"); |
| } |
| |
| public void testNullNotNull() throws Exception { |
| from("String s = null;", "s == null", true).deduce("{s = null}"); |
| from("String s = null;", "s == null", false).deduce("T"); |
| from("String s = null;", "s != null", true).deduce("T"); |
| from("String s = null;", "s != null", false).deduce("{s = null}"); |
| from("String s = null;", "null == s", true).deduce("{s = null}"); |
| from("String s = null;", "null == s", false).deduce("T"); |
| from("String s = null;", "null != s", true).deduce("T"); |
| from("String s = null;", "null != s", false).deduce("{s = null}"); |
| } |
| |
| private Result from(String decls, String expr, boolean b) throws UnableToCompleteException { |
| JProgram program = compileSnippet("void", decls + "\n if(" + expr + ") return;"); |
| JMethod mainMethod = findMainMethod(program); |
| JBlock block = ((JMethodBody) mainMethod.getBody()).getBlock(); |
| List<JStatement> statements = block.getStatements(); |
| JIfStatement ifStatement = (JIfStatement) statements.get(statements.size() - 1); |
| |
| Updater assumptions = new Updater(ConstantsAssumption.TOP); |
| AssumptionDeducer.deduceAssumption(ifStatement.getIfExpr(), |
| JBooleanLiteral.get(b), assumptions); |
| return new Result(assumptions.unwrap()); |
| } |
| |
| private class Result { |
| private final ConstantsAssumption assumptions; |
| |
| public Result(ConstantsAssumption assumptions) { |
| this.assumptions = assumptions; |
| } |
| |
| public void deduce(String expected) { |
| assertEquals(expected, assumptions.toDebugString()); |
| } |
| |
| } |
| } |