+++ /dev/null
-/*******************************************************************************
- * Copyright (c) 2000, 2004 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Common Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
-package org.eclipse.jdt.internal.compiler.ast;
-
-import org.eclipse.jdt.internal.compiler.ASTVisitor;
-import org.eclipse.jdt.internal.compiler.impl.*;
-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.lookup.*;
-
-public class FieldReference extends Reference implements InvocationSite {
-
- public Expression receiver;
- public char[] token;
- public FieldBinding binding, codegenBinding;
- public long nameSourcePosition; //(start<<32)+end
- MethodBinding syntheticReadAccessor, syntheticWriteAccessor;
- public TypeBinding receiverType;
-
- public FieldReference(char[] source, long pos) {
-
- token = source;
- nameSourcePosition = pos;
- //by default the position are the one of the field (not true for super access)
- sourceStart = (int) (pos >>> 32);
- sourceEnd = (int) (pos & 0x00000000FFFFFFFFL);
- bits |= BindingIds.FIELD;
-
- }
-
- public FlowInfo analyseAssignment(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo,
- Assignment assignment,
- boolean isCompound) {
-
- // compound assignment extra work
- if (isCompound) { // check the variable part is initialized if blank final
- if (binding.isBlankFinal()
- && receiver.isThis()
- && currentScope.allowBlankFinalFieldAssignment(binding)
- && (!flowInfo.isDefinitelyAssigned(binding))) {
- currentScope.problemReporter().uninitializedBlankFinalField(binding, this);
- // we could improve error msg here telling "cannot use compound assignment on final blank field"
- }
- manageSyntheticReadAccessIfNecessary(currentScope, flowInfo);
- }
- flowInfo =
- receiver
- .analyseCode(currentScope, flowContext, flowInfo, !binding.isStatic())
- .unconditionalInits();
- if (assignment.expression != null) {
- flowInfo =
- assignment
- .expression
- .analyseCode(currentScope, flowContext, flowInfo)
- .unconditionalInits();
- }
- manageSyntheticWriteAccessIfNecessary(currentScope, flowInfo);
-
- // check if assigning a final field
- if (binding.isFinal()) {
- // in a context where it can be assigned?
- if (binding.isBlankFinal()
- && !isCompound
- && receiver.isThis()
- && !(receiver instanceof QualifiedThisReference)
- && ((receiver.bits & ParenthesizedMASK) == 0) // (this).x is forbidden
- && currentScope.allowBlankFinalFieldAssignment(binding)) {
- if (flowInfo.isPotentiallyAssigned(binding)) {
- currentScope.problemReporter().duplicateInitializationOfBlankFinalField(
- binding,
- this);
- } else {
- flowContext.recordSettingFinal(binding, this, flowInfo);
- }
- flowInfo.markAsDefinitelyAssigned(binding);
- } else {
- // assigning a final field outside an initializer or constructor or wrong reference
- currentScope.problemReporter().cannotAssignToFinalField(binding, this);
- }
- }
- return flowInfo;
- }
-
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
-
- return analyseCode(currentScope, flowContext, flowInfo, true);
- }
-
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo,
- boolean valueRequired) {
-
- receiver.analyseCode(currentScope, flowContext, flowInfo, !binding.isStatic());
- if (valueRequired) {
- manageSyntheticReadAccessIfNecessary(currentScope, flowInfo);
- }
- return flowInfo;
- }
-
- public FieldBinding fieldBinding() {
-
- return binding;
- }
-
- public void generateAssignment(
- BlockScope currentScope,
- CodeStream codeStream,
- Assignment assignment,
- boolean valueRequired) {
-
- receiver.generateCode(
- currentScope,
- codeStream,
- !this.codegenBinding.isStatic());
- assignment.expression.generateCode(currentScope, codeStream, true);
- fieldStore(
- codeStream,
- this.codegenBinding,
- syntheticWriteAccessor,
- valueRequired);
- if (valueRequired) {
- codeStream.generateImplicitConversion(assignment.implicitConversion);
- }
- }
-
- /**
- * Field reference code generation
- *
- * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
- * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
- * @param valueRequired boolean
- */
- public void generateCode(
- BlockScope currentScope,
- CodeStream codeStream,
- boolean valueRequired) {
-
- int pc = codeStream.position;
- if (constant != NotAConstant) {
- if (valueRequired) {
- codeStream.generateConstant(constant, implicitConversion);
- }
- } else {
- boolean isStatic = this.codegenBinding.isStatic();
- receiver.generateCode(currentScope, codeStream, !isStatic);
- if (valueRequired) {
- if (this.codegenBinding.constant == NotAConstant) {
- if (this.codegenBinding.declaringClass == null) { // array length
- codeStream.arraylength();
- } else {
- if (syntheticReadAccessor == null) {
- if (isStatic) {
- codeStream.getstatic(this.codegenBinding);
- } else {
- codeStream.getfield(this.codegenBinding);
- }
- } else {
- codeStream.invokestatic(syntheticReadAccessor);
- }
- }
- codeStream.generateImplicitConversion(implicitConversion);
- } else {
- if (!isStatic) {
- codeStream.invokeObjectGetClass(); // perform null check
- codeStream.pop();
- }
- codeStream.generateConstant(this.codegenBinding.constant, implicitConversion);
- }
- } else {
- if (!isStatic){
- codeStream.invokeObjectGetClass(); // perform null check
- codeStream.pop();
- }
- }
- }
- codeStream.recordPositionsFrom(pc, this.sourceStart);
- }
-
- public void generateCompoundAssignment(
- BlockScope currentScope,
- CodeStream codeStream,
- Expression expression,
- int operator,
- int assignmentImplicitConversion,
- boolean valueRequired) {
-
- boolean isStatic;
- receiver.generateCode(
- currentScope,
- codeStream,
- !(isStatic = this.codegenBinding.isStatic()));
- if (isStatic) {
- if (syntheticReadAccessor == null) {
- codeStream.getstatic(this.codegenBinding);
- } else {
- codeStream.invokestatic(syntheticReadAccessor);
- }
- } else {
- codeStream.dup();
- if (syntheticReadAccessor == null) {
- codeStream.getfield(this.codegenBinding);
- } else {
- codeStream.invokestatic(syntheticReadAccessor);
- }
- }
- int operationTypeID;
- if ((operationTypeID = implicitConversion >> 4) == T_String) {
- codeStream.generateStringAppend(currentScope, null, expression);
- } else {
- // promote the array reference to the suitable operation type
- codeStream.generateImplicitConversion(implicitConversion);
- // generate the increment value (will by itself be promoted to the operation value)
- if (expression == IntLiteral.One) { // prefix operation
- codeStream.generateConstant(expression.constant, implicitConversion);
- } else {
- expression.generateCode(currentScope, codeStream, true);
- }
- // perform the operation
- codeStream.sendOperator(operator, operationTypeID);
- // cast the value back to the array reference type
- codeStream.generateImplicitConversion(assignmentImplicitConversion);
- }
- fieldStore(
- codeStream,
- this.codegenBinding,
- syntheticWriteAccessor,
- valueRequired);
- }
-
- public void generatePostIncrement(
- BlockScope currentScope,
- CodeStream codeStream,
- CompoundAssignment postIncrement,
- boolean valueRequired) {
-
- boolean isStatic;
- receiver.generateCode(
- currentScope,
- codeStream,
- !(isStatic = this.codegenBinding.isStatic()));
- if (isStatic) {
- if (syntheticReadAccessor == null) {
- codeStream.getstatic(this.codegenBinding);
- } else {
- codeStream.invokestatic(syntheticReadAccessor);
- }
- } else {
- codeStream.dup();
- if (syntheticReadAccessor == null) {
- codeStream.getfield(this.codegenBinding);
- } else {
- codeStream.invokestatic(syntheticReadAccessor);
- }
- }
- if (valueRequired) {
- if (isStatic) {
- if ((this.codegenBinding.type == LongBinding)
- || (this.codegenBinding.type == DoubleBinding)) {
- codeStream.dup2();
- } else {
- codeStream.dup();
- }
- } else { // Stack: [owner][old field value] ---> [old field value][owner][old field value]
- if ((this.codegenBinding.type == LongBinding)
- || (this.codegenBinding.type == DoubleBinding)) {
- codeStream.dup2_x1();
- } else {
- codeStream.dup_x1();
- }
- }
- }
- codeStream.generateConstant(
- postIncrement.expression.constant,
- implicitConversion);
- codeStream.sendOperator(postIncrement.operator, this.codegenBinding.type.id);
- codeStream.generateImplicitConversion(
- postIncrement.assignmentImplicitConversion);
- fieldStore(codeStream, this.codegenBinding, syntheticWriteAccessor, false);
- }
-
- public static final Constant getConstantFor(
- FieldBinding binding,
- Reference reference,
- boolean isImplicit,
- Scope referenceScope) {
-
- //propagation of the constant.
-
- //ref can be a FieldReference, a SingleNameReference or a QualifiedNameReference
- //indexInQualification may have a value greater than zero only for QualifiednameReference
- //if ref==null then indexInQualification==0 AND implicitReceiver == false. This case is a
- //degenerated case where a fake reference field (null)
- //is associted to a real FieldBinding in order
- //to allow its constant computation using the regular path (in other words, find the fieldDeclaration
- //and proceed to its type resolution). As implicitReceiver is false, no error reporting
- //against ref will be used ==> no nullPointerException risk ....
-
- //special treatment for langage-built-in field (their declaring class is null)
- if (binding.declaringClass == null) {
- //currently only one field "length" : the constant computation is never done
- return NotAConstant;
- }
- if (!binding.isFinal()) {
- return binding.constant = NotAConstant;
- }
- if (binding.constant != null) {
- if (isImplicit || (reference instanceof QualifiedNameReference
- && binding == ((QualifiedNameReference)reference).binding)) {
- return binding.constant;
- }
- return NotAConstant;
- }
-
- //The field has not been yet type checked.
- //It also means that the field is not coming from a class that
- //has already been compiled. It can only be from a class within
- //compilation units to process. Thus the field is NOT from a BinaryTypeBinbing
-
- SourceTypeBinding typeBinding = (SourceTypeBinding) binding.declaringClass;
- TypeDeclaration typeDecl = typeBinding.scope.referenceContext;
- FieldDeclaration fieldDecl = typeDecl.declarationOf(binding);
-
- fieldDecl.resolve(binding.isStatic() //side effect on binding
- ? typeDecl.staticInitializerScope
- : typeDecl.initializerScope);
-
- if (isImplicit || (reference instanceof QualifiedNameReference
- && binding == ((QualifiedNameReference)reference).binding)) {
- return binding.constant;
- }
- return NotAConstant;
- }
-
- public boolean isSuperAccess() {
-
- return receiver.isSuper();
- }
-
- public boolean isTypeAccess() {
-
- return receiver != null && receiver.isTypeReference();
- }
-
- /*
- * No need to emulate access to protected fields since not implicitly accessed
- */
- public void manageSyntheticReadAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) {
-
- if (!flowInfo.isReachable()) return;
- if (binding.isPrivate()) {
- if ((currentScope.enclosingSourceType() != binding.declaringClass)
- && (binding.constant == NotAConstant)) {
- syntheticReadAccessor =
- ((SourceTypeBinding) binding.declaringClass).addSyntheticMethod(binding, true);
- currentScope.problemReporter().needToEmulateFieldReadAccess(binding, this);
- return;
- }
-
- } else if (receiver instanceof QualifiedSuperReference) { // qualified super
-
- // qualified super need emulation always
- SourceTypeBinding destinationType =
- (SourceTypeBinding) (((QualifiedSuperReference) receiver)
- .currentCompatibleType);
- syntheticReadAccessor = destinationType.addSyntheticMethod(binding, true);
- currentScope.problemReporter().needToEmulateFieldReadAccess(binding, this);
- return;
-
- } else if (binding.isProtected()) {
-
- SourceTypeBinding enclosingSourceType;
- if (((bits & DepthMASK) != 0)
- && binding.declaringClass.getPackage()
- != (enclosingSourceType = currentScope.enclosingSourceType()).getPackage()) {
-
- SourceTypeBinding currentCompatibleType =
- (SourceTypeBinding) enclosingSourceType.enclosingTypeAt(
- (bits & DepthMASK) >> DepthSHIFT);
- syntheticReadAccessor = currentCompatibleType.addSyntheticMethod(binding, true);
- currentScope.problemReporter().needToEmulateFieldReadAccess(binding, this);
- return;
- }
- }
- // if the binding declaring class is not visible, need special action
- // for runtime compatibility on 1.2 VMs : change the declaring class of the binding
- // NOTE: from target 1.2 on, field's declaring class is touched if any different from receiver type
- if (binding.declaringClass != this.receiverType
- && !this.receiverType.isArrayType()
- && binding.declaringClass != null // array.length
- && binding.constant == NotAConstant
- && ((currentScope.environment().options.targetJDK >= ClassFileConstants.JDK1_2
- && binding.declaringClass.id != T_Object)
- //no change for Object fields (in case there was)
- || !binding.declaringClass.canBeSeenBy(currentScope))) {
- this.codegenBinding =
- currentScope.enclosingSourceType().getUpdatedFieldBinding(
- binding,
- (ReferenceBinding) this.receiverType);
- }
- }
-
- /*
- * No need to emulate access to protected fields since not implicitly accessed
- */
- public void manageSyntheticWriteAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) {
-
- if (!flowInfo.isReachable()) return;
- if (binding.isPrivate()) {
- if (currentScope.enclosingSourceType() != binding.declaringClass) {
- syntheticWriteAccessor =
- ((SourceTypeBinding) binding.declaringClass).addSyntheticMethod(binding, false);
- currentScope.problemReporter().needToEmulateFieldWriteAccess(binding, this);
- return;
- }
-
- } else if (receiver instanceof QualifiedSuperReference) { // qualified super
-
- // qualified super need emulation always
- SourceTypeBinding destinationType =
- (SourceTypeBinding) (((QualifiedSuperReference) receiver)
- .currentCompatibleType);
- syntheticWriteAccessor = destinationType.addSyntheticMethod(binding, false);
- currentScope.problemReporter().needToEmulateFieldWriteAccess(binding, this);
- return;
-
- } else if (binding.isProtected()) {
-
- SourceTypeBinding enclosingSourceType;
- if (((bits & DepthMASK) != 0)
- && binding.declaringClass.getPackage()
- != (enclosingSourceType = currentScope.enclosingSourceType()).getPackage()) {
-
- SourceTypeBinding currentCompatibleType =
- (SourceTypeBinding) enclosingSourceType.enclosingTypeAt(
- (bits & DepthMASK) >> DepthSHIFT);
- syntheticWriteAccessor =
- currentCompatibleType.addSyntheticMethod(binding, false);
- currentScope.problemReporter().needToEmulateFieldWriteAccess(binding, this);
- return;
- }
- }
- // if the binding declaring class is not visible, need special action
- // for runtime compatibility on 1.2 VMs : change the declaring class of the binding
- // NOTE: from target 1.2 on, field's declaring class is touched if any different from receiver type
- if (binding.declaringClass != this.receiverType
- && !this.receiverType.isArrayType()
- && binding.declaringClass != null // array.length
- && binding.constant == NotAConstant
- && ((currentScope.environment().options.targetJDK >= ClassFileConstants.JDK1_2
- && binding.declaringClass.id != T_Object)
- //no change for Object fields (in case there was)
- || !binding.declaringClass.canBeSeenBy(currentScope))) {
- this.codegenBinding =
- currentScope.enclosingSourceType().getUpdatedFieldBinding(
- binding,
- (ReferenceBinding) this.receiverType);
- }
- }
-
- public StringBuffer printExpression(int indent, StringBuffer output) {
-
- return receiver.printExpression(0, output).append('.').append(token);
- }
-
- public TypeBinding resolveType(BlockScope scope) {
-
- // Answer the signature type of the field.
- // constants are propaged when the field is final
- // and initialized with a (compile time) constant
-
- //always ignore receiver cast, since may affect constant pool reference
- boolean receiverCast = false;
- if (this.receiver instanceof CastExpression) {
- this.receiver.bits |= IgnoreNeedForCastCheckMASK; // will check later on
- receiverCast = true;
- }
- this.receiverType = receiver.resolveType(scope);
- if (this.receiverType == null) {
- constant = NotAConstant;
- return null;
- }
- if (receiverCast) {
- // due to change of declaring class with receiver type, only identity cast should be notified
- if (((CastExpression)this.receiver).expression.resolvedType == this.receiverType) {
- scope.problemReporter().unnecessaryCast((CastExpression)this.receiver);
- }
- }
- // the case receiverType.isArrayType and token = 'length' is handled by the scope API
- this.codegenBinding = this.binding = scope.getField(this.receiverType, token, this);
- if (!binding.isValidBinding()) {
- constant = NotAConstant;
- scope.problemReporter().invalidField(this, this.receiverType);
- return null;
- }
-
- if (isFieldUseDeprecated(binding, scope, (this.bits & IsStrictlyAssignedMASK) !=0)) {
- scope.problemReporter().deprecatedField(binding, this);
- }
- boolean isImplicitThisRcv = receiver.isImplicitThis();
- constant = FieldReference.getConstantFor(binding, this, isImplicitThisRcv, scope);
- if (!isImplicitThisRcv) {
- constant = NotAConstant;
- }
- if (binding.isStatic()) {
- // static field accessed through receiver? legal but unoptimal (optional warning)
- if (!(isImplicitThisRcv
- || receiver.isSuper()
- || (receiver instanceof NameReference
- && (((NameReference) receiver).bits & BindingIds.TYPE) != 0))) {
- scope.problemReporter().nonStaticAccessToStaticField(this, binding);
- }
- if (!isImplicitThisRcv && binding.declaringClass != receiverType) {
- scope.problemReporter().indirectAccessToStaticField(this, binding);
- }
- }
- return this.resolvedType = binding.type;
- }
-
- public void setActualReceiverType(ReferenceBinding receiverType) {
- // ignored
- }
-
- public void setDepth(int depth) {
-
- bits &= ~DepthMASK; // flush previous depth if any
- if (depth > 0) {
- bits |= (depth & 0xFF) << DepthSHIFT; // encoded on 8 bits
- }
- }
-
- public void setFieldIndex(int index) {
- // ignored
- }
-
- public void traverse(ASTVisitor visitor, BlockScope scope) {
-
- if (visitor.visit(this, scope)) {
- receiver.traverse(visitor, scope);
- }
- visitor.endVisit(this, scope);
- }
-}
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