net.sourceforge.phpeclipse/src/net/sourceforge/phpeclipse/internal/compiler/ast/AssertStatement.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpeclipse.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.codegen.Label;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  16 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  17 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.FieldBinding;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.ReferenceBinding;
  21 import net.sourceforge.phpdt.internal.compiler.lookup.SourceTypeBinding;
  22 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  23
  24 public class AssertStatement extends Statement {
  25
  26         public Expression assertExpression, exceptionArgument;
  27
  28         // for local variable attribute
  29         int preAssertInitStateIndex = -1;
  30         private FieldBinding assertionSyntheticFieldBinding;
  31
  32         public AssertStatement(
  33                 Expression exceptionArgument,
  34                 Expression assertExpression,
  35                 int startPosition) {
  36
  37                 this.assertExpression = assertExpression;
  38                 this.exceptionArgument = exceptionArgument;
  39                 sourceStart = startPosition;
  40                 sourceEnd = exceptionArgument.sourceEnd;
  41         }
  42
  43         public AssertStatement(Expression assertExpression, int startPosition) {
  44
  45                 this.assertExpression = assertExpression;
  46                 sourceStart = startPosition;
  47                 sourceEnd = assertExpression.sourceEnd;
  48         }
  49
  50         public FlowInfo analyseCode(
  51                 BlockScope currentScope,
  52                 FlowContext flowContext,
  53                 FlowInfo flowInfo) {
  54
  55                 preAssertInitStateIndex = currentScope.methodScope().recordInitializationStates(flowInfo);
  56
  57                 Constant cst = this.assertExpression.optimizedBooleanConstant();
  58                 boolean isOptimizedTrueAssertion = cst != NotAConstant && cst.booleanValue() == true;
  59                 boolean isOptimizedFalseAssertion = cst != NotAConstant && cst.booleanValue() == false;
  60
  61                 FlowInfo assertInfo = flowInfo.copy();
  62                 if (isOptimizedTrueAssertion) {
  63                         assertInfo.setReachMode(FlowInfo.UNREACHABLE);
  64                 }
  65                 assertInfo = assertExpression.analyseCode(currentScope, flowContext, assertInfo).unconditionalInits();
  66
  67                 if (exceptionArgument != null) {
  68                         // only gets evaluated when escaping - results are not taken into account
  69                         FlowInfo exceptionInfo = exceptionArgument.analyseCode(currentScope, flowContext, assertInfo.copy());
  70
  71                         if (!isOptimizedTrueAssertion){
  72                                 flowContext.checkExceptionHandlers(
  73                                         currentScope.getJavaLangAssertionError(),
  74                                         this,
  75                                         exceptionInfo,
  76                                         currentScope);
  77                         }
  78                 }
  79
  80                 // add the assert support in the clinit
  81                 manageSyntheticAccessIfNecessary(currentScope);
  82                 if (isOptimizedFalseAssertion) {
  83                         return flowInfo; // if assertions are enabled, the following code will be unreachable
  84                 } else {
  85                         return flowInfo.mergedWith(assertInfo.unconditionalInits());
  86                 }
  87         }
  88
  89 //      public void generateCode(BlockScope currentScope, CodeStream codeStream) {
  90 //
  91 //              if ((bits & IsReachableMASK) == 0) {
  92 //                      return;
  93 //              }
  94 //              int pc = codeStream.position;
  95 //
  96 //              if (this.assertionSyntheticFieldBinding != null) {
  97 //                      Label assertionActivationLabel = new Label(codeStream);
  98 //                      codeStream.getstatic(this.assertionSyntheticFieldBinding);
  99 //                      codeStream.ifne(assertionActivationLabel);
 100 //                      Label falseLabel = new Label(codeStream);
 101 //                      assertExpression.generateOptimizedBoolean(currentScope, codeStream, (falseLabel = new Label(codeStream)), null , true);
 102 //                      codeStream.newJavaLangAssertionError();
 103 //                      codeStream.dup();
 104 //                      if (exceptionArgument != null) {
 105 //                              exceptionArgument.generateCode(currentScope, codeStream, true);
 106 //                              codeStream.invokeJavaLangAssertionErrorConstructor(exceptionArgument.implicitConversion & 0xF);
 107 //                      } else {
 108 //                              codeStream.invokeJavaLangAssertionErrorDefaultConstructor();
 109 //                      }
 110 //                      codeStream.athrow();
 111 //                      falseLabel.place();
 112 //                      assertionActivationLabel.place();
 113 //              }
 114 //
 115 //              // May loose some local variable initializations : affecting the local variable attributes
 116 //              if (preAssertInitStateIndex != -1) {
 117 //                      codeStream.removeNotDefinitelyAssignedVariables(currentScope, preAssertInitStateIndex);
 118 //              }
 119 //              codeStream.recordPositionsFrom(pc, this.sourceStart);
 120 //      }
 121
 122         public void resolve(BlockScope scope) {
 123
 124                 assertExpression.resolveTypeExpecting(scope, BooleanBinding);
 125                 if (exceptionArgument != null) {
 126                         TypeBinding exceptionArgumentType = exceptionArgument.resolveType(scope);
 127                         if (exceptionArgumentType != null){
 128                                 if (exceptionArgumentType.id == T_void){
 129                                         scope.problemReporter().illegalVoidExpression(exceptionArgument);
 130                                 }
 131                                 exceptionArgument.implicitConversion = (exceptionArgumentType.id << 4) + exceptionArgumentType.id;
 132                         }
 133                 }
 134         }
 135
 136         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 137
 138                 if (visitor.visit(this, scope)) {
 139                         assertExpression.traverse(visitor, scope);
 140                         if (exceptionArgument != null) {
 141                                 exceptionArgument.traverse(visitor, scope);
 142                         }
 143                 }
 144                 visitor.endVisit(this, scope);
 145         }
 146
 147         public void manageSyntheticAccessIfNecessary(BlockScope currentScope) {
 148
 149                 // need assertion flag: $assertionsDisabled on outer most source clas
 150                 // (in case of static member of interface, will use the outermost static member - bug 22334)
 151                 SourceTypeBinding outerMostClass = currentScope.enclosingSourceType();
 152                 while (outerMostClass.isLocalType()){
 153                         ReferenceBinding enclosing = outerMostClass.enclosingType();
 154                         if (enclosing == null || enclosing.isInterface()) break;
 155                         outerMostClass = (SourceTypeBinding) enclosing;
 156                 }
 157
 158                 this.assertionSyntheticFieldBinding = outerMostClass.addSyntheticField(this, currentScope);
 159
 160                 // find <clinit> and enable assertion support
 161                 TypeDeclaration typeDeclaration = outerMostClass.scope.referenceType();
 162                 AbstractMethodDeclaration[] methods = typeDeclaration.methods;
 163                 for (int i = 0, max = methods.length; i < max; i++) {
 164                         AbstractMethodDeclaration method = methods[i];
 165                         if (method.isClinit()) {
 166                                 ((Clinit) method).addSupportForAssertion(assertionSyntheticFieldBinding);
 167                                 break;
 168                         }
 169                 }
 170         }
 171
 172         public String toString(int tab) {
 173
 174                 StringBuffer buffer = new StringBuffer(tabString(tab));
 175                 buffer.append("assert "); //$NON-NLS-1$
 176                 buffer.append(this.assertExpression);
 177                 if (this.exceptionArgument != null) {
 178                         buffer.append(":"); //$NON-NLS-1$
 179                         buffer.append(this.exceptionArgument);
 180                         buffer.append(";"); //$NON-NLS-1$
 181                 }
 182                 return buffer.toString();
 183         }
 184
 185 }