net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/ThrowStatement.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.phpdt.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.ASTVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  16 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  18
  19 public class ThrowStatement extends Statement {
  20         public Expression exception;
  21         public TypeBinding exceptionType;
  22
  23         public ThrowStatement(Expression exception, int startPosition) {
  24                 this.exception = exception;
  25                 this.sourceStart = startPosition;
  26                 this.sourceEnd = exception.sourceEnd;
  27         }
  28
  29         public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
  30
  31                 exception.analyseCode(currentScope, flowContext, flowInfo);
  32                 // need to check that exception thrown is actually caught somewhere
  33                 flowContext.checkExceptionHandlers(exceptionType, this, flowInfo, currentScope);
  34                 return FlowInfo.DEAD_END;
  35         }
  36
  37         /**
  38          * Throw code generation
  39          *
  40          * @param currentScope net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
  41          * @param codeStream net.sourceforge.phpdt.internal.compiler.codegen.CodeStream
  42          */
  43 //      public void generateCode(BlockScope currentScope, CodeStream codeStream) {
  44 //
  45 //              if ((bits & IsReachableMASK) == 0)
  46 //                      return;
  47 //              int pc = codeStream.position;
  48 //              exception.generateCode(currentScope, codeStream, true);
  49 //              codeStream.athrow();
  50 //              codeStream.recordPositionsFrom(pc, this.sourceStart);
  51 //      }
  52
  53         public void resolve(BlockScope scope) {
  54
  55                 exceptionType = exception.resolveTypeExpecting(scope, scope.getJavaLangThrowable());
  56
  57 //              if (exceptionType == NullBinding
  58 //                              && scope.environment().options.complianceLevel <= CompilerOptions.JDK1_3){
  59 //                      // if compliant with 1.4, this problem will not be reported
  60 //                      scope.problemReporter().cannotThrowNull(this);
  61 //              }
  62                 exception.implicitWidening(exceptionType, exceptionType);
  63         }
  64         public StringBuffer printStatement(int indent, StringBuffer output) {
  65
  66                 printIndent(indent, output).append("throw "); //$NON-NLS-1$
  67                 exception.printExpression(0, output);
  68                 return output.append(';');
  69         }
  70         public String toString(int tab) {
  71                 String s = tabString(tab);
  72                 s = s + "throw "; //$NON-NLS-1$
  73                 s = s + exception.toStringExpression();
  74                 return s;
  75         }
  76
  77         public void traverse(ASTVisitor visitor, BlockScope blockScope) {
  78                 if (visitor.visit(this, blockScope))
  79                         exception.traverse(visitor, blockScope);
  80                 visitor.endVisit(this, blockScope);
  81         }
  82 }