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