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   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.flow.InsideSubRoutineFlowContext;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.LocalVariableBinding;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  21
  22 public class SynchronizedStatement extends Statement {
  23
  24         public Expression expression;
  25         public Block block;
  26         public BlockScope scope;
  27
  28         boolean blockExit;
  29         public LocalVariableBinding synchroVariable;
  30         static final char[] SecretLocalDeclarationName = " syncValue".toCharArray(); //$NON-NLS-1$
  31
  32         public SynchronizedStatement(
  33                 Expression expression,
  34                 Block statement,
  35                 int s,
  36                 int e) {
  37
  38                 this.expression = expression;
  39                 this.block = statement;
  40                 sourceEnd = e;
  41                 sourceStart = s;
  42         }
  43
  44         public FlowInfo analyseCode(
  45                 BlockScope currentScope,
  46                 FlowContext flowContext,
  47                 FlowInfo flowInfo) {
  48
  49                 // mark the synthetic variable as being used
  50                 synchroVariable.useFlag = LocalVariableBinding.USED;
  51
  52                 // simple propagation to subnodes
  53                 flowInfo =
  54                         block.analyseCode(
  55                                 scope,
  56                                 new InsideSubRoutineFlowContext(flowContext, this),
  57                                 expression.analyseCode(scope, flowContext, flowInfo));
  58
  59                 // optimizing code gen
  60                 this.blockExit = !flowInfo.isReachable();
  61
  62                 return flowInfo;
  63         }
  64
  65         /**
  66          * Synchronized statement code generation
  67          *
  68          * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
  69          * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
  70          */
  71 //      public void generateCode(BlockScope currentScope, CodeStream codeStream) {
  72 //
  73 //              if ((bits & IsReachableMASK) == 0) {
  74 //                      return;
  75 //              }
  76 //              int pc = codeStream.position;
  77 //
  78 //              // generate the synchronization expression
  79 //              expression.generateCode(scope, codeStream, true);
  80 //              if (block.isEmptyBlock()) {
  81 //                      if ((synchroVariable.type == LongBinding)
  82 //                              || (synchroVariable.type == DoubleBinding)) {
  83 //                              codeStream.dup2();
  84 //                      } else {
  85 //                              codeStream.dup();
  86 //                      }
  87 //                      // only take the lock
  88 //                      codeStream.monitorenter();
  89 //                      codeStream.monitorexit();
  90 //              } else {
  91 //                      // enter the monitor
  92 //                      codeStream.store(synchroVariable, true);
  93 //                      codeStream.monitorenter();
  94 //
  95 //                      // generate  the body of the synchronized block
  96 //                      ExceptionLabel anyExceptionHandler = new ExceptionLabel(codeStream, null);
  97 //                      //'null' denotes any kind of exception
  98 //                      block.generateCode(scope, codeStream);
  99 //                      Label endLabel = new Label(codeStream);
 100 //                      if (!blockExit) {
 101 //                              codeStream.load(synchroVariable);
 102 //                              codeStream.monitorexit();
 103 //                              codeStream.goto_(endLabel);
 104 //                      }
 105 //                      // generate the body of the exception handler
 106 //                      anyExceptionHandler.placeEnd();
 107 //                      anyExceptionHandler.place();
 108 //                      codeStream.incrStackSize(1);
 109 //                      codeStream.load(synchroVariable);
 110 //                      codeStream.monitorexit();
 111 //                      codeStream.athrow();
 112 //                      if (!blockExit) {
 113 //                              endLabel.place();
 114 //                      }
 115 //              }
 116 //              if (scope != currentScope) {
 117 //                      codeStream.exitUserScope(scope);
 118 //              }
 119 //              codeStream.recordPositionsFrom(pc, this.sourceStart);
 120 //      }
 121
 122         public void resolve(BlockScope upperScope) {
 123
 124                 // special scope for secret locals optimization.
 125                 scope = new BlockScope(upperScope);
 126                 TypeBinding type = expression.resolveType(scope);
 127                 if (type == null)
 128                         return;
 129                 switch (type.id) {
 130                         case (T_boolean) :
 131                         case (T_char) :
 132                         case (T_float) :
 133                         case (T_double) :
 134                         case (T_byte) :
 135                         case (T_short) :
 136                         case (T_int) :
 137                         case (T_long) :
 138                                 scope.problemReporter().invalidTypeToSynchronize(expression, type);
 139                                 break;
 140                         case (T_void) :
 141                                 scope.problemReporter().illegalVoidExpression(expression);
 142                                 break;
 143                         case (T_null) :
 144                                 scope.problemReporter().invalidNullToSynchronize(expression);
 145                                 break;
 146                 }
 147                 //continue even on errors in order to have the TC done into the statements
 148                 synchroVariable = new LocalVariableBinding(SecretLocalDeclarationName, type, AccDefault, false);
 149                 scope.addLocalVariable(synchroVariable);
 150                 synchroVariable.constant = NotAConstant; // not inlinable
 151                 expression.implicitWidening(type, type);
 152                 block.resolveUsing(scope);
 153         }
 154
 155         public String toString(int tab) {
 156
 157                 String s = tabString(tab);
 158                 s = s + "synchronized (" + expression.toStringExpression() + ")";  //$NON-NLS-1$ //$NON-NLS-2$
 159                 s = s + "\n" + block.toString(tab + 1); //$NON-NLS-1$
 160                 return s;
 161         }
 162
 163         public void traverse(
 164                 IAbstractSyntaxTreeVisitor visitor,
 165                 BlockScope blockScope) {
 166
 167                 if (visitor.visit(this, blockScope)) {
 168                         expression.traverse(visitor, scope);
 169                         block.traverse(visitor, scope);
 170                 }
 171                 visitor.endVisit(this, blockScope);
 172         }
 173 }