FieldReference.java
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net.sourceforge.phpdt.internal.compiler.ast |
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/*******************************************************************************
* Copyright (c) 2000, 2003 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 net.sourceforge.phpdt.internal.compiler.ast;
import net.sourceforge.phpdt.internal.compiler.ASTVisitor;
import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
import net.sourceforge.phpdt.internal.compiler.impl.Constant;
import net.sourceforge.phpdt.internal.compiler.lookup.BindingIds;
import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
import net.sourceforge.phpdt.internal.compiler.lookup.FieldBinding;
import net.sourceforge.phpdt.internal.compiler.lookup.InvocationSite;
import net.sourceforge.phpdt.internal.compiler.lookup.MethodBinding;
import net.sourceforge.phpdt.internal.compiler.lookup.ReferenceBinding;
import net.sourceforge.phpdt.internal.compiler.lookup.Scope;
import net.sourceforge.phpdt.internal.compiler.lookup.SourceTypeBinding;
import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
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);
sourceStart = (int) pos;
sourceEnd = sourceStart + source.length;
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 = receiver.analyseCode(currentScope, flowContext, flowInfo,
!binding.isStatic()).unconditionalInits();
if (assignment.expression != null) {
flowInfo = assignment.expression.analyseCode(currentScope,
flowContext, flowInfo).unconditionalInits();
}
manageSyntheticWriteAccessIfNecessary(currentScope);
// 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.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);
}
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
* net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
* @param codeStream
* net.sourceforge.phpdt.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) {
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 >=
// CompilerOptions.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) {
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 >=
// CompilerOptions.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 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
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))
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().unnecessaryReceiverForStaticField(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 StringBuffer printExpression(int indent, StringBuffer output) {
return receiver.printExpression(0, output).append('.').append(token);
}
public String toStringExpression() {
return receiver.toString() + "." //$NON-NLS-1$
+ new String(token);
}
public void traverse(ASTVisitor visitor, BlockScope scope) {
if (visitor.visit(this, scope)) {
receiver.traverse(visitor, scope);
}
visitor.endVisit(this, scope);
}
}
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