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/*******************************************************************************
* Copyright (c) 2000, 2011 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
* $Id: AllocationExpression.java 23405 2010-02-03 17:02:18Z stephan $
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann - Contributions for
* bug 236385 - [compiler] Warn for potential programming problem if an object is created but not used
* bug 319201 - [null] no warning when unboxing SingleNameReference causes NPE
* Fraunhofer FIRST - extended API and implementation
* Technical University Berlin - extended API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.lookup.*;
import org.eclipse.objectteams.otdt.internal.core.compiler.control.Dependencies;
import org.eclipse.objectteams.otdt.internal.core.compiler.control.ITranslationStates;
import org.eclipse.objectteams.otdt.internal.core.compiler.control.StateMemento;
import org.eclipse.objectteams.otdt.internal.core.compiler.lookup.AnchorMapping;
import org.eclipse.objectteams.otdt.internal.core.compiler.lookup.DependentTypeBinding;
import org.eclipse.objectteams.otdt.internal.core.compiler.lookup.ITeamAnchor;
import org.eclipse.objectteams.otdt.internal.core.compiler.lookup.RoleTypeBinding;
import org.eclipse.objectteams.otdt.internal.core.compiler.model.RoleModel;
import org.eclipse.objectteams.otdt.internal.core.compiler.statemachine.copyinheritance.CopyInheritance;
import org.eclipse.objectteams.otdt.internal.core.compiler.util.AstGenerator;
import org.eclipse.objectteams.otdt.internal.core.compiler.util.RoleTypeCreator;
import org.eclipse.objectteams.otdt.internal.core.compiler.util.TypeAnalyzer;
/**
* OTDT changes:
*
* What: wrap resolved type if role, may need to instantiate parameters of constructor call.
* Why: this expression can be seen as a variant of MessageSend
* (invokes the constructor and returns a value).
*
* What: replace "new Role()" statements with a call to the creation method.
* Why: do it during resolve, because only now we will find the role if it is in a role file.
*
* What: record need to check duplicate roles
* if this expression creates a role using the lifting constructor
* See: Class comment in MethodBinding
*
* @version $Id: AllocationExpression.java 23405 2010-02-03 17:02:18Z stephan $
*/
public class AllocationExpression extends Expression implements InvocationSite {
public TypeReference type;
public Expression[] arguments;
public MethodBinding binding; // exact binding resulting from lookup
MethodBinding syntheticAccessor; // synthetic accessor for inner-emulation
public TypeReference[] typeArguments;
public TypeBinding[] genericTypeArguments;
public FieldDeclaration enumConstant; // for enum constant initializations
//{ObjectTeams: alternate AST in case the creation needs to be redirected through a creator call:
private MessageSend roleCreatorCall = null;
private NameReference valueParam; // if allocation type has value parameter: synthesized argument for ctor call
// SH}
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
//{ObjectTeams: redirect?
if (this.roleCreatorCall != null)
return this.roleCreatorCall.analyseCode(currentScope, flowContext, flowInfo);
// SH}
// check captured variables are initialized in current context (26134)
checkCapturedLocalInitializationIfNecessary((ReferenceBinding)this.binding.declaringClass.erasure(), currentScope, flowInfo);
// process arguments
if (this.arguments != null) {
for (int i = 0, count = this.arguments.length; i < count; i++) {
flowInfo =
this.arguments[i]
.analyseCode(currentScope, flowContext, flowInfo)
.unconditionalInits();
if ((this.arguments[i].implicitConversion & TypeIds.UNBOXING) != 0) {
this.arguments[i].checkNPE(currentScope, flowContext, flowInfo);
}
}
}
// record some dependency information for exception types
ReferenceBinding[] thrownExceptions;
if (((thrownExceptions = this.binding.thrownExceptions).length) != 0) {
if ((this.bits & ASTNode.Unchecked) != 0 && this.genericTypeArguments == null) {
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=277643, align with javac on JLS 15.12.2.6
thrownExceptions = currentScope.environment().convertToRawTypes(this.binding.thrownExceptions, true, true);
}
// check exception handling
flowContext.checkExceptionHandlers(
thrownExceptions,
this,
flowInfo.unconditionalCopy(),
currentScope);
}
if (this.binding.declaringClass.isMemberType() && !this.binding.declaringClass.isStatic()) {
// allocating a non-static member type without an enclosing instance of parent type
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=335845
currentScope.resetEnclosingMethodStaticFlag();
}
manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
manageSyntheticAccessIfNecessary(currentScope, flowInfo);
return flowInfo;
}
public void checkCapturedLocalInitializationIfNecessary(ReferenceBinding checkedType, BlockScope currentScope, FlowInfo flowInfo) {
if (((checkedType.tagBits & ( TagBits.AnonymousTypeMask|TagBits.LocalTypeMask)) == TagBits.LocalTypeMask)
&& !currentScope.isDefinedInType(checkedType)) { // only check external allocations
NestedTypeBinding nestedType = (NestedTypeBinding) checkedType;
SyntheticArgumentBinding[] syntheticArguments = nestedType.syntheticOuterLocalVariables();
if (syntheticArguments != null)
for (int i = 0, count = syntheticArguments.length; i < count; i++){
SyntheticArgumentBinding syntheticArgument = syntheticArguments[i];
LocalVariableBinding targetLocal;
if ((targetLocal = syntheticArgument.actualOuterLocalVariable) == null) continue;
if (targetLocal.declaration != null && !flowInfo.isDefinitelyAssigned(targetLocal)){
currentScope.problemReporter().uninitializedLocalVariable(targetLocal, this);
}
}
}
}
public Expression enclosingInstance() {
return null;
}
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
if (!valueRequired)
currentScope.problemReporter().unusedObjectAllocation(this);
//{ObjectTeams: redirect?
if (this.roleCreatorCall != null) {
this.roleCreatorCall.generateCode(currentScope, codeStream, valueRequired);
return;
}
// SH}
int pc = codeStream.position;
MethodBinding codegenBinding = this.binding.original();
ReferenceBinding allocatedType = codegenBinding.declaringClass;
codeStream.new_(allocatedType);
boolean isUnboxing = (this.implicitConversion & TypeIds.UNBOXING) != 0;
if (valueRequired || isUnboxing) {
codeStream.dup();
}
// better highlight for allocation: display the type individually
if (this.type != null) { // null for enum constant body
codeStream.recordPositionsFrom(pc, this.type.sourceStart);
} else {
// push enum constant name and ordinal
codeStream.ldc(String.valueOf(this.enumConstant.name));
codeStream.generateInlinedValue(this.enumConstant.binding.id);
}
// handling innerclass instance allocation - enclosing instance arguments
if (allocatedType.isNestedType()) {
codeStream.generateSyntheticEnclosingInstanceValues(
currentScope,
allocatedType,
enclosingInstance(),
this);
}
//{ObjectTeams: pass value parameter:
if (this.valueParam != null)
this.valueParam.generateCode(currentScope, codeStream, true);
// SH}
// generate the arguments for constructor
generateArguments(this.binding, this.arguments, currentScope, codeStream);
// handling innerclass instance allocation - outer local arguments
if (allocatedType.isNestedType()) {
codeStream.generateSyntheticOuterArgumentValues(
currentScope,
allocatedType,
this);
}
// invoke constructor
if (this.syntheticAccessor == null) {
codeStream.invoke(Opcodes.OPC_invokespecial, codegenBinding, null /* default declaringClass */);
} else {
// synthetic accessor got some extra arguments appended to its signature, which need values
for (int i = 0,
max = this.syntheticAccessor.parameters.length - codegenBinding.parameters.length;
i < max;
i++) {
codeStream.aconst_null();
}
codeStream.invoke(Opcodes.OPC_invokespecial, this.syntheticAccessor, null /* default declaringClass */);
}
if (valueRequired) {
codeStream.generateImplicitConversion(this.implicitConversion);
} else if (isUnboxing) {
// conversion only generated if unboxing
codeStream.generateImplicitConversion(this.implicitConversion);
switch (postConversionType(currentScope).id) {
case T_long :
case T_double :
codeStream.pop2();
break;
default :
codeStream.pop();
}
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.InvocationSite#genericTypeArguments()
*/
public TypeBinding[] genericTypeArguments() {
return this.genericTypeArguments;
}
public boolean isSuperAccess() {
//{ObjectTeams: within a creation method fake visibility:
if (isGenerated())
return true;
// SH}
return false;
}
public boolean isTypeAccess() {
return true;
}
/* Inner emulation consists in either recording a dependency
* link only, or performing one level of propagation.
*
* Dependency mechanism is used whenever dealing with source target
* types, since by the time we reach them, we might not yet know their
* exact need.
*/
public void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) {
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) != 0) return;
ReferenceBinding allocatedTypeErasure = (ReferenceBinding) this.binding.declaringClass.erasure();
// perform some emulation work in case there is some and we are inside a local type only
if (allocatedTypeErasure.isNestedType()
&& currentScope.enclosingSourceType().isLocalType()) {
if (allocatedTypeErasure.isLocalType()) {
((LocalTypeBinding) allocatedTypeErasure).addInnerEmulationDependent(currentScope, false);
// request cascade of accesses
} else {
// locally propagate, since we already now the desired shape for sure
currentScope.propagateInnerEmulation(allocatedTypeErasure, false);
// request cascade of accesses
}
}
}
public void manageSyntheticAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) {
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) != 0) return;
// if constructor from parameterized type got found, use the original constructor at codegen time
MethodBinding codegenBinding = this.binding.original();
//{ObjectTeams: baseclass decapsulation:
if ( codegenBinding.isPrivate()
&& this.type != null
&& this.type.getBaseclassDecapsulation().isAllowed())
{
return; // avoid tweaking below, which might result in CCE if declaringClass is binary.
}
// SH}
ReferenceBinding declaringClass;
if (codegenBinding.isPrivate() && currentScope.enclosingSourceType() != (declaringClass = codegenBinding.declaringClass)) {
// from 1.4 on, local type constructor can lose their private flag to ease emulation
if ((declaringClass.tagBits & TagBits.IsLocalType) != 0 && currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4) {
// constructor will not be dumped as private, no emulation required thus
codegenBinding.tagBits |= TagBits.ClearPrivateModifier;
} else {
this.syntheticAccessor = ((SourceTypeBinding) declaringClass).addSyntheticMethod(codegenBinding, isSuperAccess());
currentScope.problemReporter().needToEmulateMethodAccess(codegenBinding, this);
}
}
}
public StringBuffer printExpression(int indent, StringBuffer output) {
if (this.type != null) { // type null for enum constant initializations
output.append("new "); //$NON-NLS-1$
}
if (this.typeArguments != null) {
output.append('<');
int max = this.typeArguments.length - 1;
for (int j = 0; j < max; j++) {
this.typeArguments[j].print(0, output);
output.append(", ");//$NON-NLS-1$
}
this.typeArguments[max].print(0, output);
output.append('>');
}
if (this.type != null) { // type null for enum constant initializations
this.type.printExpression(0, output);
}
output.append('(');
if (this.arguments != null) {
for (int i = 0; i < this.arguments.length; i++) {
if (i > 0) output.append(", "); //$NON-NLS-1$
this.arguments[i].printExpression(0, output);
}
}
return output.append(')');
}
public TypeBinding resolveType(BlockScope scope) {
// Propagate the type checking to the arguments, and check if the constructor is defined.
this.constant = Constant.NotAConstant;
if (this.type == null) {
// initialization of an enum constant
this.resolvedType = scope.enclosingReceiverType();
} else {
//{ObjectTeams: support detection of new path.R():
this.type.bits |= IsAllocationType;
// SH}
this.resolvedType = this.type.resolveType(scope, true /* check bounds*/);
checkParameterizedAllocation: {
if (this.type instanceof ParameterizedQualifiedTypeReference) { // disallow new X<String>.Y<Integer>()
ReferenceBinding currentType = (ReferenceBinding)this.resolvedType;
if (currentType == null) return currentType;
do {
// isStatic() is answering true for toplevel types
if ((currentType.modifiers & ClassFileConstants.AccStatic) != 0) break checkParameterizedAllocation;
if (currentType.isRawType()) break checkParameterizedAllocation;
} while ((currentType = currentType.enclosingType())!= null);
ParameterizedQualifiedTypeReference qRef = (ParameterizedQualifiedTypeReference) this.type;
for (int i = qRef.typeArguments.length - 2; i >= 0; i--) {
if (qRef.typeArguments[i] != null) {
scope.problemReporter().illegalQualifiedParameterizedTypeAllocation(this.type, this.resolvedType);
break;
}
}
}
}
}
// will check for null after args are resolved
//{ObjectTeams: replace role allocations:
if (!scope.isGeneratedScope()) {
// also accept type.resolvedType if a problem was detected during type.resolveType().
TypeBinding typeBinding = this.resolvedType;
if (typeBinding != null && (typeBinding instanceof ProblemReferenceBinding))
typeBinding = ((ProblemReferenceBinding)typeBinding).closestMatch();
if ( typeBinding instanceof ReferenceBinding
&& ((ReferenceBinding)typeBinding).isDirectRole())
return resolveAsRoleCreationExpression((ReferenceBinding) typeBinding, scope);
}
// SH}
// resolve type arguments (for generic constructor call)
if (this.typeArguments != null) {
int length = this.typeArguments.length;
boolean argHasError = scope.compilerOptions().sourceLevel < ClassFileConstants.JDK1_5;
this.genericTypeArguments = new TypeBinding[length];
for (int i = 0; i < length; i++) {
TypeReference typeReference = this.typeArguments[i];
if ((this.genericTypeArguments[i] = typeReference.resolveType(scope, true /* check bounds*/)) == null) {
argHasError = true;
}
if (argHasError && typeReference instanceof Wildcard) {
scope.problemReporter().illegalUsageOfWildcard(typeReference);
}
}
if (argHasError) {
if (this.arguments != null) { // still attempt to resolve arguments
for (int i = 0, max = this.arguments.length; i < max; i++) {
this.arguments[i].resolveType(scope);
}
}
return null;
}
}
// buffering the arguments' types
boolean argsContainCast = false;
TypeBinding[] argumentTypes = Binding.NO_PARAMETERS;
if (this.arguments != null) {
boolean argHasError = false;
int length = this.arguments.length;
argumentTypes = new TypeBinding[length];
for (int i = 0; i < length; i++) {
Expression argument = this.arguments[i];
if (argument instanceof CastExpression) {
argument.bits |= DisableUnnecessaryCastCheck; // will check later on
argsContainCast = true;
}
if ((argumentTypes[i] = argument.resolveType(scope)) == null) {
argHasError = true;
}
}
if (argHasError) {
if (this.resolvedType instanceof ReferenceBinding) {
// record a best guess, for clients who need hint about possible contructor match
TypeBinding[] pseudoArgs = new TypeBinding[length];
for (int i = length; --i >= 0;) {
pseudoArgs[i] = argumentTypes[i] == null ? TypeBinding.NULL : argumentTypes[i]; // replace args with errors with null type
}
this.binding = scope.findMethod((ReferenceBinding) this.resolvedType, TypeConstants.INIT, pseudoArgs, this);
if (this.binding != null && !this.binding.isValidBinding()) {
MethodBinding closestMatch = ((ProblemMethodBinding)this.binding).closestMatch;
// record the closest match, for clients who may still need hint about possible method match
if (closestMatch != null) {
if (closestMatch.original().typeVariables != Binding.NO_TYPE_VARIABLES) { // generic method
// shouldn't return generic method outside its context, rather convert it to raw method (175409)
closestMatch = scope.environment().createParameterizedGenericMethod(closestMatch.original(), (RawTypeBinding)null);
}
this.binding = closestMatch;
MethodBinding closestMatchOriginal = closestMatch.original();
if (closestMatchOriginal.isOrEnclosedByPrivateType() && !scope.isDefinedInMethod(closestMatchOriginal)) {
// ignore cases where method is used from within inside itself (e.g. direct recursions)
closestMatchOriginal.modifiers |= ExtraCompilerModifiers.AccLocallyUsed;
}
}
}
}
return this.resolvedType;
}
}
if (this.resolvedType == null || !this.resolvedType.isValidBinding()) {
return null;
}
// null type denotes fake allocation for enum constant inits
if (this.type != null && !this.resolvedType.canBeInstantiated()) {
scope.problemReporter().cannotInstantiate(this.type, this.resolvedType);
return this.resolvedType;
}
ReferenceBinding allocationType = (ReferenceBinding) this.resolvedType;
//{ObjectTeams: may need to instantiate parameters of constructor
AnchorMapping anchorMapping = AnchorMapping.setupNewMapping(null, this.arguments, scope);
try {
// ensure allocation type has methods:
Dependencies.ensureBindingState(allocationType, ITranslationStates.STATE_LENV_DONE_FIELDS_AND_METHODS);
// SH}
if (!(this.binding = scope.getConstructor(allocationType, argumentTypes, this)).isValidBinding()) {
//{ObjectTeams: baseclass decapsulation?
boolean baseclassDecapsulationAllowed =
this.type != null // null happens for enum constants
&& this.type.getBaseclassDecapsulation(allocationType).isAllowed();
if ( this.binding.problemId() == ProblemReasons.NotVisible
&& ( baseclassDecapsulationAllowed
|| scope.isGeneratedScope()))
{
this.binding = ((ProblemMethodBinding)this.binding).closestMatch;
if (baseclassDecapsulationAllowed) {
scope.enclosingSourceType().roleModel.addInaccessibleBaseMethod(this.binding);
scope.problemReporter().decapsulation(this, scope);
}
} else {
// orig:
if (this.binding.declaringClass == null) {
this.binding.declaringClass = allocationType;
}
if (this.type != null && !this.type.resolvedType.isValidBinding()) {
return null;
}
scope.problemReporter().invalidConstructor(this, this.binding);
return this.resolvedType;
// :giro
}
// SH}
}
if ((this.binding.tagBits & TagBits.HasMissingType) != 0) {
scope.problemReporter().missingTypeInConstructor(this, this.binding);
}
if (isMethodUseDeprecated(this.binding, scope, true))
scope.problemReporter().deprecatedMethod(this.binding, this);
if (checkInvocationArguments(scope, null, allocationType, this.binding, this.arguments, argumentTypes, argsContainCast, this)) {
this.bits |= ASTNode.Unchecked;
}
if (this.typeArguments != null && this.binding.original().typeVariables == Binding.NO_TYPE_VARIABLES) {
scope.problemReporter().unnecessaryTypeArgumentsForMethodInvocation(this.binding, this.genericTypeArguments, this.typeArguments);
}
//{ObjectTeams: may need to wrap the resolved type
this.resolvedType = allocationType =
(ReferenceBinding)RoleTypeCreator.maybeWrapUnqualifiedRoleType(allocationType, scope, this);
DependentTypeBinding dependentTypeBinding = this.resolvedType.asPlainDependentType();
if (dependentTypeBinding != null) {
ITeamAnchor[] anchorPath = dependentTypeBinding._teamAnchor.getBestNamePath();
int len = anchorPath.length;
int prefixLen=0;
char[][] tokens;
if (anchorPath[0] instanceof FieldBinding && ((FieldBinding)anchorPath[0]).isStatic()) {
char[][] qname = TypeAnalyzer.compoundNameOfReferenceType(((FieldBinding)anchorPath[0]).declaringClass, true, false);
prefixLen = qname.length;
len += prefixLen;
tokens = new char[len][];
System.arraycopy(qname, 0, tokens, 0, qname.length);
} else {
tokens = new char[len][];
}
for (int i=0; i+prefixLen < len; i++)
tokens[i+prefixLen] = anchorPath[i].internalName();
AstGenerator gen = new AstGenerator(this);
if (len > 1)
this.valueParam = gen.qualifiedNameReference(tokens);
else
this.valueParam = gen.singleNameReference(tokens[0]);
this.valueParam.resolve(scope);
}
} finally {
AnchorMapping.removeCurrentMapping(anchorMapping);
}
// SH}
return allocationType;
}
//{ObjectTeams: replace with and resolved role creation expression:
private TypeBinding resolveAsRoleCreationExpression(ReferenceBinding typeBinding, BlockScope scope) {
RoleModel roleModel = typeBinding.roleModel;
ReferenceBinding roleClass = roleModel.getClassPartBinding();
// creating a role that should not be instantiated (OTJLD 2.4.3)?
if (typeBinding.isRole()) {
ReferenceBinding subRole = roleClass.roleModel._supercededBy;
if (subRole != null)
scope.problemReporter().instantiatingSupercededRole(this, subRole);
}
if ( !StateMemento.hasMethodResolveStarted(typeBinding)
&& roleClass != null)
{
Dependencies.ensureRoleState(
roleClass.roleModel,
ITranslationStates.STATE_METHODS_CREATED); // forces creation method to be created
}
if (!RoleTypeBinding.isRoleWithExplicitAnchor(typeBinding)) {
ReferenceBinding enclosingType = scope.enclosingReceiverType();
if (scope.methodScope().isStatic)
enclosingType = enclosingType.enclosingType();
ReferenceBinding targetEnclosing = roleClass != null
? roleClass.enclosingType()
: roleModel.getTeamModel().getBinding();
while (enclosingType != null && enclosingType.original() != targetEnclosing) {
enclosingType = enclosingType.enclosingType();
}
if (enclosingType == null) {
// create a dummy binding for error reporting (just need declaringClass):
this.binding = new MethodBinding(0, Binding.NO_PARAMETERS, Binding.NO_EXCEPTIONS, typeBinding);
scope.problemReporter().noSuchEnclosingInstance(
typeBinding.enclosingType(), this, false);
return null;
}
}
if (roleModel.hasBaseclassProblem()) {
scope.methodScope().referenceContext.tagAsHavingErrors();
return null; // creator is not generated.
}
this.roleCreatorCall = CopyInheritance.createConstructorMethodInvocationExpression(scope, this);
if (this.roleCreatorCall == null)
return null;
this.resolvedType = this.roleCreatorCall.resolveType(scope);
if (typeBinding.isParameterizedType()) {
this.resolvedType = scope.environment().createParameterizedType(
(ReferenceBinding)this.resolvedType,
((ParameterizedTypeBinding)typeBinding).arguments,
this.resolvedType.enclosingType());
}
// UI needs to find the method in this.binding:
MethodBinding origBinding = this.roleCreatorCall.binding;
if (origBinding != null && origBinding.model != null && origBinding.model._srcCtor != null)
this.binding = origBinding.model._srcCtor;
else
this.binding = origBinding;
return this.resolvedType;
}
// SH}
public void setActualReceiverType(ReferenceBinding receiverType) {
// ignored
}
public void setDepth(int i) {
// ignored
}
public void setFieldIndex(int i) {
// ignored
}
public void traverse(ASTVisitor visitor, BlockScope scope) {
//{ObjectTeams: alternate ast
if (this.roleCreatorCall != null) {
this.roleCreatorCall.traverse(visitor, scope);
return;
}
// SH}
if (visitor.visit(this, scope)) {
if (this.typeArguments != null) {
for (int i = 0, typeArgumentsLength = this.typeArguments.length; i < typeArgumentsLength; i++) {
this.typeArguments[i].traverse(visitor, scope);
}
}
if (this.type != null) { // enum constant scenario
this.type.traverse(visitor, scope);
}
if (this.arguments != null) {
for (int i = 0, argumentsLength = this.arguments.length; i < argumentsLength; i++)
this.arguments[i].traverse(visitor, scope);
}
}
visitor.endVisit(this, scope);
}
}