| package org.eclipse.jdt.internal.compiler.ast; |
| |
| /* |
| * (c) Copyright IBM Corp. 2000, 2001. |
| * All Rights Reserved. |
| */ |
| import org.eclipse.jdt.internal.compiler.IAbstractSyntaxTreeVisitor; |
| import org.eclipse.jdt.internal.compiler.impl.*; |
| import org.eclipse.jdt.internal.compiler.codegen.*; |
| import org.eclipse.jdt.internal.compiler.flow.*; |
| import org.eclipse.jdt.internal.compiler.lookup.*; |
| import org.eclipse.jdt.internal.compiler.util.*; |
| |
| public class FieldReference extends Reference implements InvocationSite { |
| public Expression receiver; |
| public char[] token; |
| public FieldBinding binding; |
| |
| 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.isFinal() && 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); |
| } |
| if (assignment.expression != null) { |
| flowInfo = assignment.expression.analyseCode(currentScope, flowContext, flowInfo).unconditionalInits(); |
| } |
| flowInfo = receiver.analyseCode(currentScope, flowContext, flowInfo, !binding.isStatic()).unconditionalInits(); |
| manageSyntheticWriteAccessIfNecessary(currentScope); |
| |
| // check if assigning a final field |
| if (binding.isFinal()) { |
| // in a context where it can be assigned? |
| if (receiver.isThis() && currentScope.allowBlankFinalFieldAssignment(binding)) { |
| if (flowInfo.isPotentiallyAssigned(binding)) { |
| currentScope.problemReporter().duplicateInitializationOfBlankFinalField(binding, this); |
| } |
| flowInfo.markAsDefinitelyAssigned(binding); |
| flowContext.recordSettingFinal(binding, this); |
| } else { |
| // assigning a final field outside an initializer or constructor |
| 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); |
| } |
| return flowInfo; |
| } |
| public FieldBinding fieldBinding() { |
| //FLOW ANALYSIS |
| |
| return binding ; } |
| public void generateAssignment(BlockScope currentScope, CodeStream codeStream, Assignment assignment, boolean valueRequired) { |
| |
| receiver.generateCode(currentScope, codeStream, !binding.isStatic()); |
| assignment.expression.generateCode(currentScope, codeStream, true); |
| fieldStore(codeStream, binding, 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 = binding.isStatic(); |
| receiver.generateCode(currentScope, codeStream, valueRequired && (!isStatic) && (binding.constant == NotAConstant)); |
| if (valueRequired) { |
| if (binding.constant == NotAConstant) { |
| if (binding.declaringClass == null) { // array length |
| codeStream.arraylength(); |
| } else { |
| if (syntheticReadAccessor == null) { |
| if (isStatic) { |
| codeStream.getstatic(binding); |
| } else { |
| codeStream.getfield(binding); |
| } |
| } else { |
| codeStream.invokestatic(syntheticReadAccessor); |
| } |
| } |
| codeStream.generateImplicitConversion(implicitConversion); |
| } else { |
| codeStream.generateConstant(binding.constant, implicitConversion); |
| } |
| } |
| } |
| codeStream.recordPositionsFrom(pc, this); |
| } |
| public void generateCompoundAssignment(BlockScope currentScope, CodeStream codeStream, Expression expression, int operator, int assignmentImplicitConversion, boolean valueRequired) { |
| boolean isStatic; |
| receiver.generateCode(currentScope, codeStream, !(isStatic = binding.isStatic())); |
| if (isStatic) { |
| if (syntheticReadAccessor == null) { |
| codeStream.getstatic(binding); |
| } else { |
| codeStream.invokestatic(syntheticReadAccessor); |
| } |
| } else { |
| codeStream.dup(); |
| if (syntheticReadAccessor == null) { |
| codeStream.getfield(binding); |
| } 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, binding, syntheticWriteAccessor, valueRequired); |
| } |
| public void generatePostIncrement(BlockScope currentScope, CodeStream codeStream, CompoundAssignment postIncrement, boolean valueRequired) { |
| boolean isStatic; |
| receiver.generateCode(currentScope, codeStream, !(isStatic = binding.isStatic())); |
| if (isStatic) { |
| if (syntheticReadAccessor == null) { |
| codeStream.getstatic(binding); |
| } else { |
| codeStream.invokestatic(syntheticReadAccessor); |
| } |
| } else { |
| codeStream.dup(); |
| if (syntheticReadAccessor == null) { |
| codeStream.getfield(binding); |
| } else { |
| codeStream.invokestatic(syntheticReadAccessor); |
| } |
| } |
| if (valueRequired) { |
| if (isStatic) { |
| if ((binding.type == LongBinding) || (binding.type == DoubleBinding)) { |
| codeStream.dup2(); |
| } else { |
| codeStream.dup(); |
| } |
| } else { // Stack: [owner][old field value] ---> [old field value][owner][old field value] |
| if ((binding.type == LongBinding) || (binding.type == DoubleBinding)) { |
| codeStream.dup2_x1(); |
| } else { |
| codeStream.dup_x1(); |
| } |
| } |
| } |
| codeStream.generateConstant(postIncrement.expression.constant, implicitConversion); |
| codeStream.sendOperator(postIncrement.operator, binding.type.id); |
| codeStream.generateImplicitConversion(postIncrement.assignmentImplicitConversion); |
| fieldStore(codeStream, binding, syntheticWriteAccessor, false); |
| } |
| public static final Constant getConstantFor( |
| FieldBinding binding, |
| boolean implicitReceiver, |
| Reference ref, |
| int indexInQualification) { |
| //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 (i.e. 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 (indexInQualification == 0) { |
| return binding.constant; |
| } |
| //see previous comment for the (sould-always-be) valid cast |
| QualifiedNameReference qnr = (QualifiedNameReference) ref; |
| if (indexInQualification == (qnr.indexOfFirstFieldBinding - 1)) { |
| 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 tb = (SourceTypeBinding) binding.declaringClass; |
| TypeDeclaration typeDecl = tb.scope.referenceContext; |
| |
| //fetch the field declaration |
| FieldDeclaration fieldDecl = null; |
| int index = 0; |
| FieldDeclaration[] fields = typeDecl.fields; |
| while (fieldDecl == null) { |
| if ((fields[index].isField()) |
| && (CharOperation.equals(fields[index].name, binding.name))) |
| fieldDecl = fields[index]; |
| else |
| index++; |
| } |
| //what scope to use (depend on the staticness of the field binding) |
| MethodScope fieldScope = |
| binding.isStatic() |
| ? typeDecl.staticInitializerScope |
| : typeDecl.initializerScope; |
| if (implicitReceiver) { //Determine if the ref is legal in the current class of the field |
| //i.e. not a forward reference .... (they are allowed when the receiver is explicit ! ... Please don't ask me why !...yet another java mystery...) |
| if (fieldScope.fieldDeclarationIndex == MethodScope.NotInFieldDecl) { |
| // no field is currently being analysed in typeDecl |
| fieldDecl.resolve(fieldScope); //side effect on binding :-) ... |
| return binding.constant; |
| } |
| //We are re-entering the same class fields analysing |
| if (((ref == null) || ((ref.bits & DepthMASK) == 0)) // not implicit ref to enclosing field |
| && (binding.id > fieldScope.fieldDeclarationIndex)) { |
| //forward reference. The declaration remains unresolved. |
| tb.scope.problemReporter().forwardReference(ref, indexInQualification, tb); |
| return NotAConstant; |
| } |
| fieldDecl.resolve(fieldScope); //side effect on binding :-) ... |
| return binding.constant; |
| } |
| //the field reference is explicity. It has to be a "simple" like field reference to get the |
| //constant propagation. For example in Packahe.Type.field1.field2 , field1 may have its |
| //constant having a propagation where field2 is always not propagating its |
| if (indexInQualification == 0) { |
| fieldDecl.resolve(fieldScope); //side effect on binding :-) ... |
| return binding.constant; |
| } |
| // Side-effect on the field binding may not be propagated out for the qualified reference |
| // unless it occurs in first place of the name sequence |
| fieldDecl.resolve(fieldScope); //side effect on binding :-) ... |
| //see previous comment for the cast that should always be valid |
| QualifiedNameReference qnr = (QualifiedNameReference) ref; |
| if (indexInQualification == (qnr.indexOfFirstFieldBinding - 1)) { |
| return binding.constant; |
| } else { |
| 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){ |
| if (binding.isPrivate() |
| && (currentScope.enclosingSourceType() != binding.declaringClass) |
| && (binding.constant == NotAConstant)) { |
| syntheticReadAccessor = binding.getSyntheticReadAccess(); |
| } |
| } |
| /* |
| * No need to emulate access to protected fields since not implicitly accessed |
| */ |
| public void manageSyntheticWriteAccessIfNecessary(BlockScope currentScope){ |
| if (binding.isPrivate() && (currentScope.enclosingSourceType() != binding.declaringClass)) { |
| syntheticWriteAccessor = binding.getSyntheticWriteAccess(); |
| } |
| } |
| 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 |
| |
| // regular receiver reference |
| this.receiverType = receiver.resolveType(scope); |
| if (this.receiverType == null){ |
| constant = NotAConstant; |
| return null; |
| } |
| // the case receiverType.isArrayType and token = 'length' is handled by the scope API |
| binding = scope.getField(this.receiverType, token, this); |
| if (!binding.isValidBinding()) { |
| constant = NotAConstant; |
| scope.problemReporter().invalidField(this, this.receiverType); |
| return null; |
| } |
| |
| if (isFieldUseDeprecated(binding, scope)) |
| scope.problemReporter().deprecatedField(binding, this); |
| |
| // check for this.x in static is done in the resolution of the receiver |
| constant = FieldReference.getConstantFor(binding, receiver == ThisReference.ThisImplicit, this, 0); |
| if (!receiver.isThis()) |
| constant = NotAConstant; |
| |
| // 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 |
| if (binding.declaringClass != this.receiverType |
| && binding.declaringClass != null // array.length |
| && binding.constant == NotAConstant |
| && !binding.declaringClass.canBeSeenBy(scope)) |
| binding = new FieldBinding(binding, (ReferenceBinding) this.receiverType); |
| return binding.type; |
| } |
| public void setDepth(int d) { |
| } |
| public void setFieldIndex(int index){} |
| public String toStringExpression(){ |
| /* slow code */ |
| |
| return receiver.toString() |
| + "."/*nonNLS*/ |
| + new String(token);} |
| public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) { |
| if (visitor.visit(this, scope)) { |
| receiver.traverse(visitor, scope); |
| } |
| visitor.endVisit(this, scope); |
| } |
| } |
