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

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v0.5
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v05.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  ******************************************************************************/
  11 package net.sourceforge.phpdt.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.codegen.CodeStream;
  15 import net.sourceforge.phpdt.internal.compiler.codegen.Label;
  16 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  17 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  18 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.ClassScope;
  21 import net.sourceforge.phpdt.internal.compiler.lookup.FieldBinding;
  22 import net.sourceforge.phpdt.internal.compiler.lookup.SourceTypeBinding;
  23 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  24
  25 public class AssertStatement extends Statement {
  26
  27         public Expression assertExpression, exceptionArgument;
  28
  29         // for local variable attribute
  30         int preAssertInitStateIndex = -1;
  31         private FieldBinding assertionSyntheticFieldBinding;
  32
  33         public AssertStatement(
  34                 Expression exceptionArgument,
  35                 Expression assertExpression,
  36                 int startPosition) {
  37
  38                 this.assertExpression = assertExpression;
  39                 this.exceptionArgument = exceptionArgument;
  40                 sourceStart = startPosition;
  41                 sourceEnd = exceptionArgument.sourceEnd;
  42         }
  43
  44         public AssertStatement(Expression assertExpression, int startPosition) {
  45
  46                 this.assertExpression = assertExpression;
  47                 sourceStart = startPosition;
  48                 sourceEnd = assertExpression.sourceEnd;
  49         }
  50
  51         public FlowInfo analyseCode(
  52                 BlockScope currentScope,
  53                 FlowContext flowContext,
  54                 FlowInfo flowInfo) {
  55
  56                 Constant constant = assertExpression.constant;
  57                 if (constant != NotAConstant && constant.booleanValue() == true) {
  58                         return flowInfo;
  59                 }
  60
  61                 preAssertInitStateIndex = currentScope.methodScope().recordInitializationStates(flowInfo);
  62                 FlowInfo assertInfo = flowInfo.copy();
  63
  64                 if (exceptionArgument != null) {
  65                         assertInfo = exceptionArgument.analyseCode(
  66                                                 currentScope,
  67                                                 flowContext,
  68                                                 assertExpression.analyseCode(currentScope, flowContext, assertInfo).unconditionalInits())
  69                                         .unconditionalInits();
  70                 } else {
  71                         assertInfo = assertExpression.analyseCode(currentScope, flowContext, assertInfo).unconditionalInits();
  72                 }
  73
  74                 // assertion might throw AssertionError (unchecked), which can have consequences in term of
  75                 // definitely assigned variables (depending on caught exception in the context)
  76                 // DISABLED - AssertionError is unchecked, try statements are already protected against these.
  77                 //flowContext.checkExceptionHandlers(currentScope.getJavaLangAssertionError(), this, assertInfo, currentScope);
  78
  79                 // only retain potential initializations
  80                 flowInfo.addPotentialInitializationsFrom(assertInfo.unconditionalInits());
  81
  82                 // add the assert support in the clinit
  83                 manageSyntheticAccessIfNecessary(currentScope);
  84
  85                 return flowInfo;
  86         }
  87
  88         public void generateCode(BlockScope currentScope, CodeStream codeStream) {
  89
  90                 if ((bits & IsReachableMASK) == 0) {
  91                         return;
  92                 }
  93                 int pc = codeStream.position;
  94
  95                 if (this.assertionSyntheticFieldBinding != null) {
  96                         Label assertionActivationLabel = new Label(codeStream);
  97                         codeStream.getstatic(this.assertionSyntheticFieldBinding);
  98                         codeStream.ifne(assertionActivationLabel);
  99                         Label falseLabel = new Label(codeStream);
 100                         assertExpression.generateOptimizedBoolean(currentScope, codeStream, (falseLabel = new Label(codeStream)), null , true);
 101                         codeStream.newJavaLangAssertionError();
 102                         codeStream.dup();
 103                         if (exceptionArgument != null) {
 104                                 exceptionArgument.generateCode(currentScope, codeStream, true);
 105                                 codeStream.invokeJavaLangAssertionErrorConstructor(exceptionArgument.implicitConversion & 0xF);
 106                         } else {
 107                                 codeStream.invokeJavaLangAssertionErrorDefaultConstructor();
 108                         }
 109                         codeStream.athrow();
 110                         falseLabel.place();
 111                         assertionActivationLabel.place();
 112                 }
 113
 114                 // May loose some local variable initializations : affecting the local variable attributes
 115                 if (preAssertInitStateIndex != -1) {
 116                         codeStream.removeNotDefinitelyAssignedVariables(currentScope, preAssertInitStateIndex);
 117                 }
 118                 codeStream.recordPositionsFrom(pc, this.sourceStart);
 119         }
 120
 121         public void resolve(BlockScope scope) {
 122
 123                 assertExpression.resolveTypeExpecting(scope, BooleanBinding);
 124                 if (exceptionArgument != null) {
 125                         TypeBinding exceptionArgumentType = exceptionArgument.resolveType(scope);
 126                         if (exceptionArgumentType != null){
 127                                 if (exceptionArgumentType.id == T_void){
 128                                         scope.problemReporter().illegalVoidExpression(exceptionArgument);
 129                                 }
 130                                 exceptionArgument.implicitConversion = (exceptionArgumentType.id << 4) + exceptionArgumentType.id;
 131                         }
 132                 }
 133         }
 134
 135         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 136
 137                 if (visitor.visit(this, scope)) {
 138                         assertExpression.traverse(visitor, scope);
 139                         if (exceptionArgument != null) {
 140                                 exceptionArgument.traverse(visitor, scope);
 141                         }
 142                 }
 143                 visitor.endVisit(this, scope);
 144         }
 145
 146         public void manageSyntheticAccessIfNecessary(BlockScope currentScope) {
 147
 148                 // need assertion flag: $assertionsDisabled on outer most source type
 149                 ClassScope outerMostClassScope = currentScope.outerMostClassScope();
 150                 SourceTypeBinding sourceTypeBinding = outerMostClassScope.enclosingSourceType();
 151                 this.assertionSyntheticFieldBinding = sourceTypeBinding.addSyntheticField(this, currentScope);
 152
 153                 // find <clinit> and enable assertion support
 154                 TypeDeclaration typeDeclaration = outerMostClassScope.referenceType();
 155                 AbstractMethodDeclaration[] methods = typeDeclaration.methods;
 156                 for (int i = 0, max = methods.length; i < max; i++) {
 157                         AbstractMethodDeclaration method = methods[i];
 158                         if (method.isClinit()) {
 159                                 ((Clinit) method).addSupportForAssertion(assertionSyntheticFieldBinding);
 160                                 break;
 161                         }
 162                 }
 163         }
 164
 165         public String toString(int tab) {
 166
 167                 StringBuffer buffer = new StringBuffer(tabString(tab));
 168                 buffer.append("assert"); //$NON-NLS-1$
 169                 buffer.append(this.assertExpression);
 170                 if (this.exceptionArgument != null) {
 171                         buffer.append(":"); //$NON-NLS-1$
 172                         buffer.append(this.exceptionArgument);
 173                         buffer.append(";"); //$NON-NLS-1$
 174                 }
 175                 return buffer.toString();
 176         }
 177
 178 }