net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/BreakStatement.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.IAbstractSyntaxTreeVisitor;
  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
  18 public class BreakStatement extends BranchStatement {
  19
  20         public BreakStatement(Expression expr, int sourceStart, int e) {
  21                 super(expr, sourceStart, e);
  22         }
  23
  24         public FlowInfo analyseCode(
  25                 BlockScope currentScope,
  26                 FlowContext flowContext,
  27                 FlowInfo flowInfo) {
  28
  29                 // here requires to generate a sequence of finally blocks invocations depending corresponding
  30                 // to each of the traversed try statements, so that execution will terminate properly.
  31
  32                 // lookup the label, this should answer the returnContext
  33 //              FlowContext targetContext = (label == null)
  34 //                      ? flowContext.getTargetContextForDefaultBreak()
  35 //                      : flowContext.getTargetContextForBreakLabel(label);
  36 //
  37 //              if (targetContext == null) {
  38 //                      if (label == null) {
  39 //                              currentScope.problemReporter().invalidBreak(this);
  40 //                      } else {
  41 //                              currentScope.problemReporter().undefinedLabel(this);
  42 //                      }
  43 //                      return flowInfo; // pretend it did not break since no actual target
  44 //              }
  45 //
  46 //              targetLabel = targetContext.breakLabel();
  47 //              FlowContext traversedContext = flowContext;
  48 //              int subIndex = 0, maxSub = 5;
  49 //              subroutines = new ASTNode[maxSub];
  50 //
  51 //              do {
  52 //                      ASTNode sub;
  53 //                      if ((sub = traversedContext.subRoutine()) != null) {
  54 //                              if (subIndex == maxSub) {
  55 //                                      System.arraycopy(subroutines, 0, (subroutines = new ASTNode[maxSub*=2]), 0, subIndex); // grow
  56 //                              }
  57 //                              subroutines[subIndex++] = sub;
  58 //                              if (sub.cannotReturn()) {
  59 //                                      break;
  60 //                              }
  61 //                      }
  62 //                      traversedContext.recordReturnFrom(flowInfo.unconditionalInits());
  63 //
  64 //                      ASTNode node;
  65 //                      if ((node = traversedContext.associatedNode) instanceof TryStatement) {
  66 //                              TryStatement tryStatement = (TryStatement) node;
  67 //                              flowInfo.addInitializationsFrom(tryStatement.subRoutineInits); // collect inits
  68 //                      } else if (traversedContext == targetContext) {
  69 //                              // only record break info once accumulated through subroutines, and only against target context
  70 //                              targetContext.recordBreakFrom(flowInfo);
  71 //                              break;
  72 //                      }
  73 //              } while ((traversedContext = traversedContext.parent) != null);
  74 //
  75 //              // resize subroutines
  76 //              if (subIndex != maxSub) {
  77 //                      System.arraycopy(subroutines, 0, (subroutines = new ASTNode[subIndex]), 0, subIndex);
  78 //              }
  79                 return FlowInfo.DEAD_END;
  80         }
  81
  82         public String toString(int tab) {
  83
  84                 String s = tabString(tab);
  85                 s += "break "; //$NON-NLS-1$
  86                 if (expression != null)
  87                         s += expression.toString();
  88                 return s;
  89         }
  90         public StringBuffer printStatement(int tab, StringBuffer output) {
  91
  92                 printIndent(tab, output).append("break "); //$NON-NLS-1$
  93                 if (expression != null) output.append(expression);
  94                 return output.append(';');
  95         }
  96         public void traverse(
  97                 IAbstractSyntaxTreeVisitor visitor,
  98                 BlockScope blockscope) {
  99
 100                 visitor.visit(this, blockscope);
 101                 visitor.endVisit(this, blockscope);
 102         }
 103 }