X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Feclipse%2Fjdt%2Finternal%2Fcompiler%2Fast%2FFieldReference.java;fp=src%2Forg%2Feclipse%2Fjdt%2Finternal%2Fcompiler%2Fast%2FFieldReference.java;h=9c4a86d5fc6f1f1ecac206bcda9c969ff5b0ca43;hb=040fa5af2cd00017cf3575950cdaade34a6d7f6c;hp=0000000000000000000000000000000000000000;hpb=a580fb8376d315d05e4d6bfdff9ff1101a151cd6;p=org.ibex.tool.git diff --git a/src/org/eclipse/jdt/internal/compiler/ast/FieldReference.java b/src/org/eclipse/jdt/internal/compiler/ast/FieldReference.java new file mode 100644 index 0000000..9c4a86d --- /dev/null +++ b/src/org/eclipse/jdt/internal/compiler/ast/FieldReference.java @@ -0,0 +1,559 @@ +/******************************************************************************* + * 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); + } +}