Package org.eclipse.jdt.internal.compiler.flow

Examples of org.eclipse.jdt.internal.compiler.flow.FlowInfo

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    int initialComplaintLevel = (flowInfo.reachMode() & FlowInfo.UNREACHABLE) != 0 ? Statement.COMPLAINED_FAKE_REACHABLE : Statement.NOT_COMPLAINED;

    // process the element variable and collection
    this.collection.checkNPE(currentScope, flowContext, flowInfo);
    flowInfo = this.elementVariable.analyseCode(this.scope, flowContext, flowInfo);   
    FlowInfo condInfo = this.collection.analyseCode(this.scope, flowContext, flowInfo.copy());

    // element variable will be assigned when iterating
    condInfo.markAsDefinitelyAssigned(this.elementVariable.binding);

    this.postCollectionInitStateIndex = currentScope.methodScope().recordInitializationStates(condInfo);

    // process the action
    LoopingFlowContext loopingContext =
      new LoopingFlowContext(flowContext, flowInfo, this, this.breakLabel,
        this.continueLabel, this.scope);
    UnconditionalFlowInfo actionInfo =
      condInfo.nullInfoLessUnconditionalCopy();
    actionInfo.markAsDefinitelyUnknown(this.elementVariable.binding);
    FlowInfo exitBranch;
    if (!(this.action == null || (this.action.isEmptyBlock()
        && currentScope.compilerOptions().complianceLevel <= ClassFileConstants.JDK1_3))) {

      if (this.action.complainIfUnreachable(actionInfo, this.scope, initialComplaintLevel) < Statement.COMPLAINED_UNREACHABLE) {
        actionInfo = this.action.analyseCode(this.scope, loopingContext, actionInfo).unconditionalCopy();
      }

      // code generation can be optimized when no need to continue in the loop
      exitBranch = flowInfo.unconditionalCopy().
      addInitializationsFrom(condInfo.initsWhenFalse());
      // TODO (maxime) no need to test when false: can optimize (same for action being unreachable above)
      if ((actionInfo.tagBits & loopingContext.initsOnContinue.tagBits &
          FlowInfo.UNREACHABLE_OR_DEAD) != 0) {
        this.continueLabel = null;
      } else {
        actionInfo = actionInfo.mergedWith(loopingContext.initsOnContinue);
        loopingContext.complainOnDeferredFinalChecks(this.scope, actionInfo);
        exitBranch.addPotentialInitializationsFrom(actionInfo);
      }
    } else {
      exitBranch = condInfo.initsWhenFalse();
    }

    // we need the variable to iterate the collection even if the
    // element variable is not used
    final boolean hasEmptyAction = this.action == null
    || this.action.isEmptyBlock()
    || ((this.action.bits & IsUsefulEmptyStatement) != 0);

    switch(this.kind) {
      case ARRAY :
        if (!hasEmptyAction
            || this.elementVariable.binding.resolvedPosition != -1) {
          this.collectionVariable.useFlag = LocalVariableBinding.USED;
          if (this.continueLabel != null) {
            this.indexVariable.useFlag = LocalVariableBinding.USED;
            this.maxVariable.useFlag = LocalVariableBinding.USED;
          }
        }
        break;
      case RAW_ITERABLE :
      case GENERIC_ITERABLE :
        this.indexVariable.useFlag = LocalVariableBinding.USED;
        break;
    }
    //end of loop
    loopingContext.complainOnDeferredNullChecks(currentScope, actionInfo);

    FlowInfo mergedInfo = FlowInfo.mergedOptimizedBranches(
        (loopingContext.initsOnBreak.tagBits &
            FlowInfo.UNREACHABLE) != 0 ?
                loopingContext.initsOnBreak :
                  flowInfo.addInitializationsFrom(loopingContext.initsOnBreak), // recover upstream null info
                  false,
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      FieldBinding fieldBinding = (FieldBinding) this.binding;
      if (this.indexOfFirstFieldBinding == 1) { // was an implicit reference to the first field binding
        // check if reading a final blank field
        if (fieldBinding.isBlankFinal()
            && currentScope.needBlankFinalFieldInitializationCheck(fieldBinding)) {
          FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(fieldBinding.declaringClass.original(), flowInfo);
          if (!fieldInits.isDefinitelyAssigned(fieldBinding)) {
            currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
          }
        }
      }
      if (!fieldBinding.isStatic()) {
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    switch (this.bits & ASTNode.RestrictiveFlagMASK) {
      case Binding.FIELD : // reading a field
        FieldBinding fieldBinding = (FieldBinding) this.binding;
        if (fieldBinding.isBlankFinal()
            && currentScope.needBlankFinalFieldInitializationCheck(fieldBinding)) {
          FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(fieldBinding.declaringClass.original(), flowInfo);
          if (!fieldInits.isDefinitelyAssigned(fieldBinding)) {
            currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
          }
        }
        if (!fieldBinding.isStatic()) {
          // https://bugs.eclipse.org/bugs/show_bug.cgi?id=318682
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        manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
      }
      // check if reading a final blank field
      FieldBinding fieldBinding = (FieldBinding) this.binding;
      if (fieldBinding.isBlankFinal() && currentScope.needBlankFinalFieldInitializationCheck(fieldBinding)) {
        FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(fieldBinding.declaringClass.original(), flowInfo);
        if (!fieldInits.isDefinitelyAssigned(fieldBinding)) {
          currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
        }
      }
      if (!fieldBinding.isStatic()) {
        // https://bugs.eclipse.org/bugs/show_bug.cgi?id=318682
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      }
      // check if final blank field
      if (lastFieldBinding.isBlankFinal()
            && this.otherBindings != null // the last field binding is only assigned
           && currentScope.needBlankFinalFieldInitializationCheck(lastFieldBinding)) {
        FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(lastFieldBinding.declaringClass.original(), flowInfo);
        if (!fieldInits.isDefinitelyAssigned(lastFieldBinding)) {
          currentScope.problemReporter().uninitializedBlankFinalField(lastFieldBinding, this);
        }
      }
      if (!lastFieldBinding.isStatic()) {
        currentScope.resetEnclosingMethodStaticFlag();
      }
      break;
    case Binding.LOCAL :
      // first binding is a local variable
      LocalVariableBinding localBinding;
      if (!flowInfo
        .isDefinitelyAssigned(localBinding = (LocalVariableBinding) this.binding)) {
        currentScope.problemReporter().uninitializedLocalVariable(localBinding, this);
      }
      if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0)  {
        localBinding.useFlag = LocalVariableBinding.USED;
      } else if (localBinding.useFlag == LocalVariableBinding.UNUSED) {
        localBinding.useFlag = LocalVariableBinding.FAKE_USED;
      }
      if (needValue) {
        checkNPE(currentScope, flowContext, flowInfo, true);
      }
  }

  if (needValue) {
    manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
    // only for first binding
  }
  // all intermediate field accesses are read accesses
  if (this.otherBindings != null) {
    for (int i = 0; i < otherBindingsCount-1; i++) {
      lastFieldBinding = this.otherBindings[i];
      needValue = !this.otherBindings[i+1].isStatic();
      if (needValue || complyTo14) {
        manageSyntheticAccessIfNecessary(currentScope, lastFieldBinding, i + 1, flowInfo);
      }
    }
    lastFieldBinding = this.otherBindings[otherBindingsCount-1];
  }

  if (isCompound) {
    if (otherBindingsCount == 0
        && lastFieldBinding.isBlankFinal()
        && currentScope.needBlankFinalFieldInitializationCheck(lastFieldBinding)) {
      FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(lastFieldBinding.declaringClass, flowInfo);
      if (!fieldInits.isDefinitelyAssigned(lastFieldBinding)) {
        currentScope.problemReporter().uninitializedBlankFinalField(lastFieldBinding, this);
      }
    }
    manageSyntheticAccessIfNecessary(currentScope, lastFieldBinding, otherBindingsCount, flowInfo);
  }
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  this.type = type;
  type.bits |= ASTNode.IgnoreRawTypeCheck; // no need to worry about raw type usage
}

public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
  FlowInfo result = this.expression
    .analyseCode(currentScope, flowContext, flowInfo)
    .unconditionalInits();
  if ((this.expression.implicitConversion & TypeIds.UNBOXING) != 0) {
    this.expression.checkNPE(currentScope, flowContext, flowInfo);
  }
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  // compound assignment extra work
  if (isCompound) { // check the variable part is initialized if blank final
    if (this.binding.isBlankFinal()
      && this.receiver.isThis()
      && currentScope.needBlankFinalFieldInitializationCheck(this.binding)) {
      FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(this.binding.declaringClass.original(), flowInfo);
      if (!fieldInits.isDefinitelyAssigned(this.binding)) {
        currentScope.problemReporter().uninitializedBlankFinalField(this.binding, this);
        // we could improve error msg here telling "cannot use compound assignment on final blank field"
      }
    }
    manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
 
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    int initialComplaintLevel = (flowInfo.reachMode() & FlowInfo.UNREACHABLE) != 0 ? Statement.COMPLAINED_FAKE_REACHABLE : Statement.NOT_COMPLAINED;

    // process the element variable and collection
    this.collection.checkNPE(currentScope, flowContext, flowInfo);
    flowInfo = this.elementVariable.analyseCode(this.scope, flowContext, flowInfo);   
    FlowInfo condInfo = this.collection.analyseCode(this.scope, flowContext, flowInfo.copy());

    // element variable will be assigned when iterating
    condInfo.markAsDefinitelyAssigned(this.elementVariable.binding);

    this.postCollectionInitStateIndex = currentScope.methodScope().recordInitializationStates(condInfo);

    // process the action
    LoopingFlowContext loopingContext =
      new LoopingFlowContext(flowContext, flowInfo, this, this.breakLabel,
        this.continueLabel, this.scope);
    UnconditionalFlowInfo actionInfo =
      condInfo.nullInfoLessUnconditionalCopy();
    actionInfo.markAsDefinitelyUnknown(this.elementVariable.binding);
    FlowInfo exitBranch;
    if (!(this.action == null || (this.action.isEmptyBlock()
        && currentScope.compilerOptions().complianceLevel <= ClassFileConstants.JDK1_3))) {

      if (this.action.complainIfUnreachable(actionInfo, this.scope, initialComplaintLevel) < Statement.COMPLAINED_UNREACHABLE) {
        actionInfo = this.action.analyseCode(this.scope, loopingContext, actionInfo).unconditionalCopy();
      }

      // code generation can be optimized when no need to continue in the loop
      exitBranch = flowInfo.unconditionalCopy().
      addInitializationsFrom(condInfo.initsWhenFalse());
      // TODO (maxime) no need to test when false: can optimize (same for action being unreachable above)
      if ((actionInfo.tagBits & loopingContext.initsOnContinue.tagBits &
          FlowInfo.UNREACHABLE) != 0) {
        this.continueLabel = null;
      } else {
        actionInfo = actionInfo.mergedWith(loopingContext.initsOnContinue);
        loopingContext.complainOnDeferredFinalChecks(this.scope, actionInfo);
        exitBranch.addPotentialInitializationsFrom(actionInfo);
      }
    } else {
      exitBranch = condInfo.initsWhenFalse();
    }

    // we need the variable to iterate the collection even if the
    // element variable is not used
    final boolean hasEmptyAction = this.action == null
    || this.action.isEmptyBlock()
    || ((this.action.bits & IsUsefulEmptyStatement) != 0);

    switch(this.kind) {
      case ARRAY :
        if (!hasEmptyAction
            || this.elementVariable.binding.resolvedPosition != -1) {
          this.collectionVariable.useFlag = LocalVariableBinding.USED;
          if (this.continueLabel != null) {
            this.indexVariable.useFlag = LocalVariableBinding.USED;
            this.maxVariable.useFlag = LocalVariableBinding.USED;
          }
        }
        break;
      case RAW_ITERABLE :
      case GENERIC_ITERABLE :
        this.indexVariable.useFlag = LocalVariableBinding.USED;
        break;
    }
    //end of loop
    loopingContext.complainOnDeferredNullChecks(currentScope, actionInfo);

    FlowInfo mergedInfo = FlowInfo.mergedOptimizedBranches(
        (loopingContext.initsOnBreak.tagBits &
            FlowInfo.UNREACHABLE) != 0 ?
                loopingContext.initsOnBreak :
                  flowInfo.addInitializationsFrom(loopingContext.initsOnBreak), // recover upstream null info
                  false,
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    switch (this.bits & ASTNode.RestrictiveFlagMASK) {
      case Binding.FIELD : // reading a field
        FieldBinding fieldBinding;
        if ((fieldBinding = (FieldBinding) this.binding).isBlankFinal()
            && currentScope.needBlankFinalFieldInitializationCheck(fieldBinding)) {
          FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(fieldBinding.declaringClass.original(), flowInfo);
          if (!fieldInits.isDefinitelyAssigned(fieldBinding)) {
            currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
          }
        }
        manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
        break;
 
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        manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
      }
      // check if reading a final blank field
      FieldBinding fieldBinding = (FieldBinding) this.binding;
      if (fieldBinding.isBlankFinal() && currentScope.needBlankFinalFieldInitializationCheck(fieldBinding)) {
        FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(fieldBinding.declaringClass.original(), flowInfo);
        if (!fieldInits.isDefinitelyAssigned(fieldBinding)) {
          currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
        }
      }
      break;
    case Binding.LOCAL : // reading a local variable
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