/*******************************************************************************
* Copyright (c) 2000, 2013 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
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann <stephan@cs.tu-berlin.de> - Contributions for
* bug 185682 - Increment/decrement operators mark local variables as read
* bug 331649 - [compiler][null] consider null annotations for fields
* bug 383368 - [compiler][null] syntactic null analysis for field references
* Bug 412203 - [compiler] Internal compiler error: java.lang.IllegalArgumentException: info cannot be null
* Bug 400874 - [1.8][compiler] Inference infrastructure should evolve to meet JLS8 18.x (Part G of JSR335 spec)
* Jesper S Moller - Contributions for
* Bug 378674 - "The method can be declared as static" is wrong
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.codegen.CodeStream;
import org.eclipse.jdt.internal.compiler.codegen.Opcodes;
import org.eclipse.jdt.internal.compiler.flow.FlowContext;
import org.eclipse.jdt.internal.compiler.flow.FlowInfo;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
import org.eclipse.jdt.internal.compiler.lookup.InferenceContext18;
import org.eclipse.jdt.internal.compiler.lookup.InvocationSite;
import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
import org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.MethodScope;
import org.eclipse.jdt.internal.compiler.lookup.MissingTypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.ProblemFieldBinding;
import org.eclipse.jdt.internal.compiler.lookup.ProblemReasons;
import org.eclipse.jdt.internal.compiler.lookup.ProblemReferenceBinding;
import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
import org.eclipse.jdt.internal.compiler.lookup.Scope;
import org.eclipse.jdt.internal.compiler.lookup.SourceTypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.TagBits;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeIds;
import org.eclipse.jdt.internal.compiler.lookup.VariableBinding;
public class FieldReference extends Reference implements InvocationSite {
public static final int READ = 0;
public static final int WRITE = 1;
public Expression receiver;
public char[] token;
public FieldBinding binding; // exact binding resulting from lookup
public MethodBinding[] syntheticAccessors; // [0]=read accessor [1]=write accessor
public long nameSourcePosition; //(start<<32)+end
public TypeBinding actualReceiverType;
public TypeBinding genericCast;
public FieldReference(char[] source, long pos) {
this.token = source;
this.nameSourcePosition = pos;
//by default the position are the one of the field (not true for super access)
this.sourceStart = (int) (pos >>> 32);
this.sourceEnd = (int) (pos & 0x00000000FFFFFFFFL);
this.bits |= Binding.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 (this.binding.isBlankFinal()
&& this.receiver.isThis()
&& currentScope.needBlankFinalFieldInitializationCheck(this.binding)) {
FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(this.binding.declaringClass.original(), flowInfo);
if (!fieldInits.isDefinitelyAssigned(this.binding)) {
currentScope.problemReporter().uninitializedBlankFinalField(this.binding, this);
// we could improve error msg here telling "cannot use compound assignment on final blank field"
}
}
manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
}
flowInfo =
this.receiver
.analyseCode(currentScope, flowContext, flowInfo, !this.binding.isStatic())
.unconditionalInits();
if (assignment.expression != null) {
flowInfo =
assignment
.expression
.analyseCode(currentScope, flowContext, flowInfo)
.unconditionalInits();
}
manageSyntheticAccessIfNecessary(currentScope, flowInfo, false /*write-access*/);
// check if assigning a final field
if (this.binding.isFinal()) {
// in a context where it can be assigned?
if (this.binding.isBlankFinal()
&& !isCompound
&& this.receiver.isThis()
&& !(this.receiver instanceof QualifiedThisReference)
&& ((this.receiver.bits & ASTNode.ParenthesizedMASK) == 0) // (this).x is forbidden
&& currentScope.allowBlankFinalFieldAssignment(this.binding)) {
if (flowInfo.isPotentiallyAssigned(this.binding)) {
currentScope.problemReporter().duplicateInitializationOfBlankFinalField(
this.binding,
this);
} else {
flowContext.recordSettingFinal(this.binding, this, flowInfo);
}
flowInfo.markAsDefinitelyAssigned(this.binding);
} else {
// assigning a final field outside an initializer or constructor or wrong reference
currentScope.problemReporter().cannotAssignToFinalField(this.binding, this);
}
} else if (this.binding.isNonNull()) {
// in a context where it can be assigned?
if ( !isCompound
&& this.receiver.isThis()
&& !(this.receiver instanceof QualifiedThisReference)
&& TypeBinding.equalsEquals(this.receiver.resolvedType, this.binding.declaringClass) // inherited fields are not tracked here
&& ((this.receiver.bits & ASTNode.ParenthesizedMASK) == 0)) { // (this).x is forbidden
flowInfo.markAsDefinitelyAssigned(this.binding);
}
}
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) {
boolean nonStatic = !this.binding.isStatic();
this.receiver.analyseCode(currentScope, flowContext, flowInfo, nonStatic);
if (nonStatic) {
this.receiver.checkNPE(currentScope, flowContext, flowInfo);
}
if (valueRequired || currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4) {
manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
}
return flowInfo;
}
public boolean checkNPE(BlockScope scope, FlowContext flowContext, FlowInfo flowInfo) {
if (flowContext.isNullcheckedFieldAccess(this)) {
return true; // enough seen
}
return checkNullableFieldDereference(scope, this.binding, this.nameSourcePosition);
}
/**
* @see org.eclipse.jdt.internal.compiler.ast.Expression#computeConversion(org.eclipse.jdt.internal.compiler.lookup.Scope, org.eclipse.jdt.internal.compiler.lookup.TypeBinding, org.eclipse.jdt.internal.compiler.lookup.TypeBinding)
*/
public void computeConversion(Scope scope, TypeBinding runtimeTimeType, TypeBinding compileTimeType) {
if (runtimeTimeType == null || compileTimeType == null)
return;
// set the generic cast after the fact, once the type expectation is fully known (no need for strict cast)
if (this.binding != null && this.binding.isValidBinding()) {
FieldBinding originalBinding = this.binding.original();
TypeBinding originalType = originalBinding.type;
// extra cast needed if field type is type variable
if (originalType.leafComponentType().isTypeVariable()) {
TypeBinding targetType = (!compileTimeType.isBaseType() && runtimeTimeType.isBaseType())
? compileTimeType // unboxing: checkcast before conversion
: runtimeTimeType;
this.genericCast = originalBinding.type.genericCast(targetType);
if (this.genericCast instanceof ReferenceBinding) {
ReferenceBinding referenceCast = (ReferenceBinding) this.genericCast;
if (!referenceCast.canBeSeenBy(scope)) {
scope.problemReporter().invalidType(this,
new ProblemReferenceBinding(
CharOperation.splitOn('.', referenceCast.shortReadableName()),
referenceCast,
ProblemReasons.NotVisible));
}
}
}
}
super.computeConversion(scope, runtimeTimeType, compileTimeType);
}
public FieldBinding fieldBinding() {
return this.binding;
}
public void generateAssignment(BlockScope currentScope, CodeStream codeStream, Assignment assignment, boolean valueRequired) {
int pc = codeStream.position;
FieldBinding codegenBinding = this.binding.original();
this.receiver.generateCode(currentScope, codeStream, !codegenBinding.isStatic());
codeStream.recordPositionsFrom(pc, this.sourceStart);
assignment.expression.generateCode(currentScope, codeStream, true);
fieldStore(currentScope, codeStream, codegenBinding, this.syntheticAccessors == null ? null : this.syntheticAccessors[FieldReference.WRITE], this.actualReceiverType, this.receiver.isImplicitThis(), valueRequired);
if (valueRequired) {
codeStream.generateImplicitConversion(assignment.implicitConversion);
}
// no need for generic cast as value got dupped
}
/**
* 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 (this.constant != Constant.NotAConstant) {
if (valueRequired) {
codeStream.generateConstant(this.constant, this.implicitConversion);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
return;
}
FieldBinding codegenBinding = this.binding.original();
boolean isStatic = codegenBinding.isStatic();
boolean isThisReceiver = this.receiver instanceof ThisReference;
Constant fieldConstant = codegenBinding.constant();
if (fieldConstant != Constant.NotAConstant) {
if (!isThisReceiver) {
this.receiver.generateCode(currentScope, codeStream, !isStatic);
if (!isStatic){
codeStream.invokeObjectGetClass();
codeStream.pop();
}
}
if (valueRequired) {
codeStream.generateConstant(fieldConstant, this.implicitConversion);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
return;
}
if (valueRequired
|| (!isThisReceiver && currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4)
|| ((this.implicitConversion & TypeIds.UNBOXING) != 0)
|| (this.genericCast != null)) {
this.receiver.generateCode(currentScope, codeStream, !isStatic);
if ((this.bits & NeedReceiverGenericCast) != 0) {
codeStream.checkcast(this.actualReceiverType);
}
pc = codeStream.position;
if (codegenBinding.declaringClass == null) { // array length
codeStream.arraylength();
if (valueRequired) {
codeStream.generateImplicitConversion(this.implicitConversion);
} else {
// could occur if !valueRequired but compliance >= 1.4
codeStream.pop();
}
} else {
if (this.syntheticAccessors == null || this.syntheticAccessors[FieldReference.READ] == null) {
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, codegenBinding, this.actualReceiverType, this.receiver.isImplicitThis());
if (isStatic) {
codeStream.fieldAccess(Opcodes.OPC_getstatic, codegenBinding, constantPoolDeclaringClass);
} else {
codeStream.fieldAccess(Opcodes.OPC_getfield, codegenBinding, constantPoolDeclaringClass);
}
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, this.syntheticAccessors[FieldReference.READ], null /* default declaringClass */);
}
// required cast must occur even if no value is required
if (this.genericCast != null) codeStream.checkcast(this.genericCast);
if (valueRequired) {
codeStream.generateImplicitConversion(this.implicitConversion);
} else {
boolean isUnboxing = (this.implicitConversion & TypeIds.UNBOXING) != 0;
// conversion only generated if unboxing
if (isUnboxing) codeStream.generateImplicitConversion(this.implicitConversion);
switch (isUnboxing ? postConversionType(currentScope).id : codegenBinding.type.id) {
case T_long :
case T_double :
codeStream.pop2();
break;
default :
codeStream.pop();
}
}
}
} else {
if (isThisReceiver) {
if (isStatic){
// if no valueRequired, still need possible side-effects of <clinit> invocation, if field belongs to different class
if (TypeBinding.notEquals(this.binding.original().declaringClass, this.actualReceiverType.erasure())) {
MethodBinding accessor = this.syntheticAccessors == null ? null : this.syntheticAccessors[FieldReference.READ];
if (accessor == null) {
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, codegenBinding, this.actualReceiverType, this.receiver.isImplicitThis());
codeStream.fieldAccess(Opcodes.OPC_getstatic, codegenBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, accessor, null /* default declaringClass */);
}
switch (codegenBinding.type.id) {
case T_long :
case T_double :
codeStream.pop2();
break;
default :
codeStream.pop();
}
}
}
} else {
this.receiver.generateCode(currentScope, codeStream, !isStatic);
if (!isStatic){
codeStream.invokeObjectGetClass(); // perform null check
codeStream.pop();
}
}
}
codeStream.recordPositionsFrom(pc, this.sourceEnd);
}
public void generateCompoundAssignment(BlockScope currentScope, CodeStream codeStream, Expression expression, int operator, int assignmentImplicitConversion, boolean valueRequired) {
boolean isStatic;
// check if compound assignment is the only usage of a private field
reportOnlyUselesslyReadPrivateField(currentScope, this.binding, valueRequired);
FieldBinding codegenBinding = this.binding.original();
this.receiver.generateCode(currentScope, codeStream, !(isStatic = codegenBinding.isStatic()));
if (isStatic) {
if (this.syntheticAccessors == null || this.syntheticAccessors[FieldReference.READ] == null) {
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, codegenBinding, this.actualReceiverType, this.receiver.isImplicitThis());
codeStream.fieldAccess(Opcodes.OPC_getstatic, codegenBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, this.syntheticAccessors[FieldReference.READ], null /* default declaringClass */);
}
} else {
codeStream.dup();
if (this.syntheticAccessors == null || this.syntheticAccessors[FieldReference.READ] == null) {
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, codegenBinding, this.actualReceiverType, this.receiver.isImplicitThis());
codeStream.fieldAccess(Opcodes.OPC_getfield, codegenBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, this.syntheticAccessors[FieldReference.READ], null /* default declaringClass */);
}
}
int operationTypeID;
switch(operationTypeID = (this.implicitConversion & TypeIds.IMPLICIT_CONVERSION_MASK) >> 4) {
case T_JavaLangString :
case T_JavaLangObject :
case T_undefined :
codeStream.generateStringConcatenationAppend(currentScope, null, expression);
break;
default :
if (this.genericCast != null)
codeStream.checkcast(this.genericCast);
// promote the array reference to the suitable operation type
codeStream.generateImplicitConversion(this.implicitConversion);
// generate the increment value (will by itself be promoted to the operation value)
if (expression == IntLiteral.One) { // prefix operation
codeStream.generateConstant(expression.constant, this.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(currentScope, codeStream, codegenBinding, this.syntheticAccessors == null ? null : this.syntheticAccessors[FieldReference.WRITE], this.actualReceiverType, this.receiver.isImplicitThis(), valueRequired);
// no need for generic cast as value got dupped
}
public void generatePostIncrement(BlockScope currentScope, CodeStream codeStream, CompoundAssignment postIncrement, boolean valueRequired) {
boolean isStatic;
// check if postIncrement is the only usage of a private field
reportOnlyUselesslyReadPrivateField(currentScope, this.binding, valueRequired);
FieldBinding codegenBinding = this.binding.original();
this.receiver.generateCode(currentScope, codeStream, !(isStatic = codegenBinding.isStatic()));
if (isStatic) {
if (this.syntheticAccessors == null || this.syntheticAccessors[FieldReference.READ] == null) {
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, codegenBinding, this.actualReceiverType, this.receiver.isImplicitThis());
codeStream.fieldAccess(Opcodes.OPC_getstatic, codegenBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, this.syntheticAccessors[FieldReference.READ], null /* default declaringClass */);
}
} else {
codeStream.dup();
if (this.syntheticAccessors == null || this.syntheticAccessors[FieldReference.READ] == null) {
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, codegenBinding, this.actualReceiverType, this.receiver.isImplicitThis());
codeStream.fieldAccess(Opcodes.OPC_getfield, codegenBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, this.syntheticAccessors[FieldReference.READ], null /* default declaringClass */);
}
}
TypeBinding operandType;
if (this.genericCast != null) {
codeStream.checkcast(this.genericCast);
operandType = this.genericCast;
} else {
operandType = codegenBinding.type;
}
if (valueRequired) {
if (isStatic) {
switch (operandType.id) {
case TypeIds.T_long :
case TypeIds.T_double :
codeStream.dup2();
break;
default :
codeStream.dup();
break;
}
} else { // Stack: [owner][old field value] ---> [old field value][owner][old field value]
switch (operandType.id) {
case TypeIds.T_long :
case TypeIds.T_double :
codeStream.dup2_x1();
break;
default :
codeStream.dup_x1();
break;
}
}
}
codeStream.generateImplicitConversion(this.implicitConversion);
codeStream.generateConstant(
postIncrement.expression.constant,
this.implicitConversion);
codeStream.sendOperator(postIncrement.operator, this.implicitConversion & TypeIds.COMPILE_TYPE_MASK);
codeStream.generateImplicitConversion(
postIncrement.preAssignImplicitConversion);
fieldStore(currentScope, codeStream, codegenBinding, this.syntheticAccessors == null ? null : this.syntheticAccessors[FieldReference.WRITE], this.actualReceiverType, this.receiver.isImplicitThis(), false);
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.InvocationSite#genericTypeArguments()
*/
public TypeBinding[] genericTypeArguments() {
return null;
}
public InferenceContext18 freshInferenceContext(Scope scope) {
return null;
}
public boolean isEquivalent(Reference reference) {
// only consider field references relative to "this":
if (this.receiver.isThis() && !(this.receiver instanceof QualifiedThisReference)) {
// current is a simple "this.f1"
char[] otherToken = null;
// matching 'reference' could be "f1" or "this.f1":
if (reference instanceof SingleNameReference) {
otherToken = ((SingleNameReference) reference).token;
} else if (reference instanceof FieldReference) {
FieldReference fr = (FieldReference) reference;
if (fr.receiver.isThis() && !(fr.receiver instanceof QualifiedThisReference)) {
otherToken = fr.token;
}
}
return otherToken != null && CharOperation.equals(this.token, otherToken);
} else {
// search deeper for "this" inside:
char[][] thisTokens = getThisFieldTokens(1);
if (thisTokens == null) {
return false;
}
// other can be "this.f1.f2", too, or "f1.f2":
char[][] otherTokens = null;
if (reference instanceof FieldReference) {
otherTokens = ((FieldReference) reference).getThisFieldTokens(1);
} else if (reference instanceof QualifiedNameReference) {
if (((QualifiedNameReference)reference).binding instanceof LocalVariableBinding)
return false; // initial variable mismatch: local (from f1.f2) vs. field (from this.f1.f2)
otherTokens = ((QualifiedNameReference) reference).tokens;
}
return CharOperation.equals(thisTokens, otherTokens);
}
}
private char[][] getThisFieldTokens(int nestingCount) {
char[][] result = null;
if (this.receiver.isThis() && ! (this.receiver instanceof QualifiedThisReference)) {
// found an inner-most this-reference, start building the token array:
result = new char[nestingCount][];
// fill it front to tail while traveling back out:
result[0] = this.token;
} else if (this.receiver instanceof FieldReference) {
result = ((FieldReference)this.receiver).getThisFieldTokens(nestingCount+1);
if (result != null) {
// front to tail: outermost is last:
result[result.length-nestingCount] = this.token;
}
}
return result;
}
public boolean isSuperAccess() {
return this.receiver.isSuper();
}
public boolean isTypeAccess() {
return this.receiver != null && this.receiver.isTypeReference();
}
public FieldBinding lastFieldBinding() {
return this.binding;
}
/*
* No need to emulate access to protected fields since not implicitly accessed
*/
public void manageSyntheticAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo, boolean isReadAccess) {
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) != 0) return;
// if field from parameterized type got found, use the original field at codegen time
FieldBinding codegenBinding = this.binding.original();
if (this.binding.isPrivate()) {
if ((TypeBinding.notEquals(currentScope.enclosingSourceType(), codegenBinding.declaringClass))
&& this.binding.constant() == Constant.NotAConstant) {
if (this.syntheticAccessors == null)
this.syntheticAccessors = new MethodBinding[2];
this.syntheticAccessors[isReadAccess ? FieldReference.READ : FieldReference.WRITE] =
((SourceTypeBinding) codegenBinding.declaringClass).addSyntheticMethod(codegenBinding, isReadAccess, false /* not super ref in remote type*/);
currentScope.problemReporter().needToEmulateFieldAccess(codegenBinding, this, isReadAccess);
return;
}
} else if (this.receiver instanceof QualifiedSuperReference) { // qualified super
// qualified super need emulation always
SourceTypeBinding destinationType = (SourceTypeBinding) (((QualifiedSuperReference) this.receiver).currentCompatibleType);
if (this.syntheticAccessors == null)
this.syntheticAccessors = new MethodBinding[2];
this.syntheticAccessors[isReadAccess ? FieldReference.READ : FieldReference.WRITE] = destinationType.addSyntheticMethod(codegenBinding, isReadAccess, isSuperAccess());
currentScope.problemReporter().needToEmulateFieldAccess(codegenBinding, this, isReadAccess);
return;
} else if (this.binding.isProtected()) {
SourceTypeBinding enclosingSourceType;
if (((this.bits & ASTNode.DepthMASK) != 0)
&& this.binding.declaringClass.getPackage()
!= (enclosingSourceType = currentScope.enclosingSourceType()).getPackage()) {
SourceTypeBinding currentCompatibleType =
(SourceTypeBinding) enclosingSourceType.enclosingTypeAt(
(this.bits & ASTNode.DepthMASK) >> ASTNode.DepthSHIFT);
if (this.syntheticAccessors == null)
this.syntheticAccessors = new MethodBinding[2];
this.syntheticAccessors[isReadAccess ? FieldReference.READ : FieldReference.WRITE] = currentCompatibleType.addSyntheticMethod(codegenBinding, isReadAccess, isSuperAccess());
currentScope.problemReporter().needToEmulateFieldAccess(codegenBinding, this, isReadAccess);
return;
}
}
}
public Constant optimizedBooleanConstant() {
switch (this.resolvedType.id) {
case T_boolean :
case T_JavaLangBoolean :
return this.constant != Constant.NotAConstant ? this.constant : this.binding.constant();
default :
return Constant.NotAConstant;
}
}
/**
* @see org.eclipse.jdt.internal.compiler.ast.Expression#postConversionType(Scope)
*/
public TypeBinding postConversionType(Scope scope) {
TypeBinding convertedType = this.resolvedType;
if (this.genericCast != null)
convertedType = this.genericCast;
int runtimeType = (this.implicitConversion & TypeIds.IMPLICIT_CONVERSION_MASK) >> 4;
switch (runtimeType) {
case T_boolean :
convertedType = TypeBinding.BOOLEAN;
break;
case T_byte :
convertedType = TypeBinding.BYTE;
break;
case T_short :
convertedType = TypeBinding.SHORT;
break;
case T_char :
convertedType = TypeBinding.CHAR;
break;
case T_int :
convertedType = TypeBinding.INT;
break;
case T_float :
convertedType = TypeBinding.FLOAT;
break;
case T_long :
convertedType = TypeBinding.LONG;
break;
case T_double :
convertedType = TypeBinding.DOUBLE;
break;
default :
}
if ((this.implicitConversion & TypeIds.BOXING) != 0) {
convertedType = scope.environment().computeBoxingType(convertedType);
}
return convertedType;
}
public StringBuffer printExpression(int indent, StringBuffer output) {
return this.receiver.printExpression(0, output).append('.').append(this.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 |= ASTNode.DisableUnnecessaryCastCheck; // will check later on
receiverCast = true;
}
this.actualReceiverType = this.receiver.resolveType(scope);
if (this.actualReceiverType == null) {
this.constant = Constant.NotAConstant;
return null;
}
if (receiverCast) {
// due to change of declaring class with receiver type, only identity cast should be notified
if (TypeBinding.equalsEquals(((CastExpression)this.receiver).expression.resolvedType, this.actualReceiverType)) {
scope.problemReporter().unnecessaryCast((CastExpression)this.receiver);
}
}
// the case receiverType.isArrayType and token = 'length' is handled by the scope API
FieldBinding fieldBinding = this.binding = scope.getField(this.actualReceiverType, this.token, this);
if (!fieldBinding.isValidBinding()) {
this.constant = Constant.NotAConstant;
if (this.receiver.resolvedType instanceof ProblemReferenceBinding) {
// problem already got signaled on receiver, do not report secondary problem
return null;
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=245007 avoid secondary errors in case of
// missing super type for anonymous classes ...
ReferenceBinding declaringClass = fieldBinding.declaringClass;
boolean avoidSecondary = declaringClass != null &&
declaringClass.isAnonymousType() &&
declaringClass.superclass() instanceof MissingTypeBinding;
if (!avoidSecondary) {
scope.problemReporter().invalidField(this, this.actualReceiverType);
}
if (fieldBinding instanceof ProblemFieldBinding) {
ProblemFieldBinding problemFieldBinding = (ProblemFieldBinding) fieldBinding;
FieldBinding closestMatch = problemFieldBinding.closestMatch;
switch(problemFieldBinding.problemId()) {
case ProblemReasons.InheritedNameHidesEnclosingName :
case ProblemReasons.NotVisible :
case ProblemReasons.NonStaticReferenceInConstructorInvocation :
case ProblemReasons.NonStaticReferenceInStaticContext :
if (closestMatch != null) {
fieldBinding = closestMatch;
}
}
}
if (!fieldBinding.isValidBinding()) {
return null;
}
}
// handle indirect inheritance thru variable secondary bound
// receiver may receive generic cast, as part of implicit conversion
TypeBinding oldReceiverType = this.actualReceiverType;
this.actualReceiverType = this.actualReceiverType.getErasureCompatibleType(fieldBinding.declaringClass);
this.receiver.computeConversion(scope, this.actualReceiverType, this.actualReceiverType);
if (TypeBinding.notEquals(this.actualReceiverType, oldReceiverType) && TypeBinding.notEquals(this.receiver.postConversionType(scope), this.actualReceiverType)) { // record need for explicit cast at codegen since receiver could not handle it
this.bits |= NeedReceiverGenericCast;
}
if (isFieldUseDeprecated(fieldBinding, scope, this.bits)) {
scope.problemReporter().deprecatedField(fieldBinding, this);
}
boolean isImplicitThisRcv = this.receiver.isImplicitThis();
this.constant = isImplicitThisRcv ? fieldBinding.constant() : Constant.NotAConstant;
if (fieldBinding.isStatic()) {
// static field accessed through receiver? legal but unoptimal (optional warning)
if (!(isImplicitThisRcv
|| (this.receiver instanceof NameReference
&& (((NameReference) this.receiver).bits & Binding.TYPE) != 0))) {
scope.problemReporter().nonStaticAccessToStaticField(this, fieldBinding);
}
ReferenceBinding declaringClass = this.binding.declaringClass;
if (!isImplicitThisRcv
&& TypeBinding.notEquals(declaringClass, this.actualReceiverType)
&& declaringClass.canBeSeenBy(scope)) {
scope.problemReporter().indirectAccessToStaticField(this, fieldBinding);
}
// check if accessing enum static field in initializer
if (declaringClass.isEnum()) {
MethodScope methodScope = scope.methodScope();
SourceTypeBinding sourceType = scope.enclosingSourceType();
if (this.constant == Constant.NotAConstant
&& !methodScope.isStatic
&& (TypeBinding.equalsEquals(sourceType, declaringClass) || TypeBinding.equalsEquals(sourceType.superclass, declaringClass)) // enum constant body
&& methodScope.isInsideInitializerOrConstructor()) {
scope.problemReporter().enumStaticFieldUsedDuringInitialization(this.binding, this);
}
}
}
TypeBinding fieldType = fieldBinding.type;
if (fieldType != null) {
if ((this.bits & ASTNode.IsStrictlyAssigned) == 0) {
fieldType = fieldType.capture(scope, this.sourceEnd); // perform capture conversion if read access
}
this.resolvedType = fieldType;
if ((fieldType.tagBits & TagBits.HasMissingType) != 0) {
scope.problemReporter().invalidType(this, fieldType);
return null;
}
}
return fieldType;
}
public void setActualReceiverType(ReferenceBinding receiverType) {
this.actualReceiverType = receiverType;
}
public void setDepth(int depth) {
this.bits &= ~ASTNode.DepthMASK; // flush previous depth if any
if (depth > 0) {
this.bits |= (depth & 0xFF) << ASTNode.DepthSHIFT; // encoded on 8 bits
}
}
public void setFieldIndex(int index) {
// ignored
}
public void traverse(ASTVisitor visitor, BlockScope scope) {
if (visitor.visit(this, scope)) {
this.receiver.traverse(visitor, scope);
}
visitor.endVisit(this, scope);
}
public VariableBinding nullAnnotatedVariableBinding(boolean supportTypeAnnotations) {
if (this.binding != null) {
if (supportTypeAnnotations
|| ((this.binding.tagBits & TagBits.AnnotationNullMASK) != 0)) {
return this.binding;
}
}
return null;
}
}