/*******************************************************************************
* Copyright (c) 2000, 2011 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> - Contribution for bug 185682 - Increment/decrement operators mark local variables as read
*******************************************************************************/
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.CompilerOptions;
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.ClassScope;
import org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
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.SyntheticMethodBinding;
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;
import org.eclipse.jdt.internal.compiler.problem.ProblemSeverities;
public class QualifiedNameReference extends NameReference {
public char[][] tokens;
public long[] sourcePositions;
public FieldBinding[] otherBindings;
int[] otherDepths;
public int indexOfFirstFieldBinding;//points (into tokens) for the first token that corresponds to first FieldBinding
public SyntheticMethodBinding syntheticWriteAccessor;
public SyntheticMethodBinding[] syntheticReadAccessors;
public TypeBinding genericCast;
public TypeBinding[] otherGenericCasts;
public QualifiedNameReference(char[][] tokens, long[] positions, int sourceStart, int sourceEnd) {
this.tokens = tokens;
this.sourcePositions = positions;
this.sourceStart = sourceStart;
this.sourceEnd = sourceEnd;
}
public FlowInfo analyseAssignment(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo, Assignment assignment, boolean isCompound) {
// determine the rank until which we now we do not need any actual value for the field access
int otherBindingsCount = this.otherBindings == null ? 0 : this.otherBindings.length;
boolean needValue = otherBindingsCount == 0 || !this.otherBindings[0].isStatic();
boolean complyTo14 = currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4;
FieldBinding lastFieldBinding = null;
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD : // reading a field
lastFieldBinding = (FieldBinding) this.binding;
if (needValue || complyTo14) {
manageSyntheticAccessIfNecessary(currentScope, lastFieldBinding, 0, flowInfo);
}
// check if final blank field
if (lastFieldBinding.isBlankFinal()
&& this.otherBindings != null // the last field binding is only assigned
&& currentScope.needBlankFinalFieldInitializationCheck(lastFieldBinding)) {
FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(lastFieldBinding.declaringClass.original(), flowInfo);
if (!fieldInits.isDefinitelyAssigned(lastFieldBinding)) {
currentScope.problemReporter().uninitializedBlankFinalField(lastFieldBinding, this);
}
}
if (!lastFieldBinding.isStatic()) {
currentScope.resetEnclosingMethodStaticFlag();
}
break;
case Binding.LOCAL :
// first binding is a local variable
LocalVariableBinding localBinding;
if (!flowInfo
.isDefinitelyAssigned(localBinding = (LocalVariableBinding) this.binding)) {
currentScope.problemReporter().uninitializedLocalVariable(localBinding, this);
}
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0) {
localBinding.useFlag = LocalVariableBinding.USED;
} else if (localBinding.useFlag == LocalVariableBinding.UNUSED) {
localBinding.useFlag = LocalVariableBinding.FAKE_USED;
}
if (needValue) {
checkNPE(currentScope, flowContext, flowInfo, true);
}
}
if (needValue) {
manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
// only for first binding
}
// all intermediate field accesses are read accesses
if (this.otherBindings != null) {
for (int i = 0; i < otherBindingsCount-1; i++) {
lastFieldBinding = this.otherBindings[i];
needValue = !this.otherBindings[i+1].isStatic();
if (needValue || complyTo14) {
manageSyntheticAccessIfNecessary(currentScope, lastFieldBinding, i + 1, flowInfo);
}
}
lastFieldBinding = this.otherBindings[otherBindingsCount-1];
}
if (isCompound) {
if (otherBindingsCount == 0
&& lastFieldBinding.isBlankFinal()
&& currentScope.needBlankFinalFieldInitializationCheck(lastFieldBinding)) {
FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(lastFieldBinding.declaringClass, flowInfo);
if (!fieldInits.isDefinitelyAssigned(lastFieldBinding)) {
currentScope.problemReporter().uninitializedBlankFinalField(lastFieldBinding, this);
}
}
manageSyntheticAccessIfNecessary(currentScope, lastFieldBinding, otherBindingsCount, flowInfo);
}
if (assignment.expression != null) {
flowInfo =
assignment
.expression
.analyseCode(currentScope, flowContext, flowInfo)
.unconditionalInits();
}
// the last field access is a write access
if (lastFieldBinding.isFinal()) {
// in a context where it can be assigned?
if (otherBindingsCount == 0
&& this.indexOfFirstFieldBinding == 1
&& lastFieldBinding.isBlankFinal()
&& !isCompound
&& currentScope.allowBlankFinalFieldAssignment(lastFieldBinding)) {
if (flowInfo.isPotentiallyAssigned(lastFieldBinding)) {
currentScope.problemReporter().duplicateInitializationOfBlankFinalField(lastFieldBinding, this);
} else {
flowContext.recordSettingFinal(lastFieldBinding, this, flowInfo);
}
flowInfo.markAsDefinitelyAssigned(lastFieldBinding);
} else {
currentScope.problemReporter().cannotAssignToFinalField(lastFieldBinding, this);
if (otherBindingsCount == 0 && currentScope.allowBlankFinalFieldAssignment(lastFieldBinding)) { // pretend it got assigned
flowInfo.markAsDefinitelyAssigned(lastFieldBinding);
}
}
}
manageSyntheticAccessIfNecessary(currentScope, lastFieldBinding, -1 /*write-access*/, flowInfo);
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) {
// determine the rank until which we now we do not need any actual value for the field access
int otherBindingsCount = this.otherBindings == null ? 0 : this.otherBindings.length;
boolean needValue = otherBindingsCount == 0 ? valueRequired : !this.otherBindings[0].isStatic();
boolean complyTo14 = currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4;
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD : // reading a field
if (needValue || complyTo14) {
manageSyntheticAccessIfNecessary(currentScope, (FieldBinding) this.binding, 0, flowInfo);
}
FieldBinding fieldBinding = (FieldBinding) this.binding;
if (this.indexOfFirstFieldBinding == 1) { // was an implicit reference to the first field binding
// check if reading a final blank field
if (fieldBinding.isBlankFinal()
&& currentScope.needBlankFinalFieldInitializationCheck(fieldBinding)) {
FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(fieldBinding.declaringClass.original(), flowInfo);
if (!fieldInits.isDefinitelyAssigned(fieldBinding)) {
currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
}
}
}
if (!fieldBinding.isStatic()) {
currentScope.resetEnclosingMethodStaticFlag();
}
break;
case Binding.LOCAL : // reading a local variable
LocalVariableBinding localBinding;
if (!flowInfo.isDefinitelyAssigned(localBinding = (LocalVariableBinding) this.binding)) {
currentScope.problemReporter().uninitializedLocalVariable(localBinding, this);
}
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0) {
localBinding.useFlag = LocalVariableBinding.USED;
} else if (localBinding.useFlag == LocalVariableBinding.UNUSED) {
localBinding.useFlag = LocalVariableBinding.FAKE_USED;
}
if (needValue) {
checkNPE(currentScope, flowContext, flowInfo, true);
}
}
if (needValue) {
manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
// only for first binding (if value needed only)
}
if (this.otherBindings != null) {
for (int i = 0; i < otherBindingsCount; i++) {
needValue = i < otherBindingsCount-1 ? !this.otherBindings[i+1].isStatic() : valueRequired;
if (needValue || complyTo14) {
manageSyntheticAccessIfNecessary(currentScope, this.otherBindings[i], i + 1, flowInfo);
}
}
}
return flowInfo;
}
public void checkNPE(BlockScope scope, FlowContext flowContext, FlowInfo flowInfo, boolean checkString) {
// cannot override localVariableBinding because this would project o.m onto o when
// analyzing assignments
if ((this.bits & ASTNode.RestrictiveFlagMASK) == Binding.LOCAL) {
LocalVariableBinding local = (LocalVariableBinding) this.binding;
if (local != null &&
(local.type.tagBits & TagBits.IsBaseType) == 0 &&
(checkString || local.type.id != TypeIds.T_JavaLangString)) {
if ((this.bits & ASTNode.IsNonNull) == 0) {
flowContext.recordUsingNullReference(scope, local, this,
FlowContext.MAY_NULL, flowInfo);
}
flowInfo.markAsComparedEqualToNonNull(local);
// from thereon it is set
if ((flowContext.tagBits & FlowContext.HIDE_NULL_COMPARISON_WARNING) != 0) {
flowInfo.markedAsNullOrNonNullInAssertExpression(local);
}
if (flowContext.initsOnFinally != null) {
flowContext.initsOnFinally.markAsComparedEqualToNonNull(local);
if ((flowContext.tagBits & FlowContext.HIDE_NULL_COMPARISON_WARNING) != 0) {
flowContext.initsOnFinally.markedAsNullOrNonNullInAssertExpression(local);
}
}
}
}
}
/**
* @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)
FieldBinding field = null;
int length = this.otherBindings == null ? 0 : this.otherBindings.length;
if (length == 0) {
if ((this.bits & Binding.FIELD) != 0 && this.binding != null && this.binding.isValidBinding()) {
field = (FieldBinding) this.binding;
}
} else {
field = this.otherBindings[length-1];
}
if (field != null) {
FieldBinding originalBinding = field.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;
TypeBinding typeCast = originalType.genericCast(targetType);
setGenericCast(length, typeCast);
if (typeCast instanceof ReferenceBinding) {
ReferenceBinding referenceCast = (ReferenceBinding) typeCast;
if (!referenceCast.canBeSeenBy(scope)) {
scope.problemReporter().invalidType(this,
new ProblemReferenceBinding(
CharOperation.splitOn('.', referenceCast.shortReadableName()),
referenceCast,
ProblemReasons.NotVisible));
}
}
}
}
super.computeConversion(scope, runtimeTimeType, compileTimeType);
}
public void generateAssignment(BlockScope currentScope, CodeStream codeStream, Assignment assignment, boolean valueRequired) {
int pc = codeStream.position;
FieldBinding lastFieldBinding = generateReadSequence(currentScope, codeStream);
codeStream.recordPositionsFrom(pc , this.sourceStart);
assignment.expression.generateCode(currentScope, codeStream, true);
fieldStore(currentScope, codeStream, lastFieldBinding, this.syntheticWriteAccessor, getFinalReceiverType(), false /*implicit this*/, valueRequired);
// equivalent to valuesRequired[maxOtherBindings]
if (valueRequired) {
codeStream.generateImplicitConversion(assignment.implicitConversion);
}
}
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);
}
} else {
FieldBinding lastFieldBinding = generateReadSequence(currentScope, codeStream);
if (lastFieldBinding != null) {
boolean isStatic = lastFieldBinding.isStatic();
Constant fieldConstant = lastFieldBinding.constant();
if (fieldConstant != Constant.NotAConstant) {
if (!isStatic){
codeStream.invokeObjectGetClass();
codeStream.pop();
}
if (valueRequired) { // inline the last field constant
codeStream.generateConstant(fieldConstant, this.implicitConversion);
}
} else {
boolean isFirst = lastFieldBinding == this.binding
&& (this.indexOfFirstFieldBinding == 1 || lastFieldBinding.declaringClass == currentScope.enclosingReceiverType())
&& this.otherBindings == null; // could be dup: next.next.next
TypeBinding requiredGenericCast = getGenericCast(this.otherBindings == null ? 0 : this.otherBindings.length);
if (valueRequired
|| (!isFirst && currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4)
|| ((this.implicitConversion & TypeIds.UNBOXING) != 0)
|| requiredGenericCast != null) {
int lastFieldPc = codeStream.position;
if (lastFieldBinding.declaringClass == null) { // array length
codeStream.arraylength();
if (valueRequired) {
codeStream.generateImplicitConversion(this.implicitConversion);
} else {
// could occur if !valueRequired but compliance >= 1.4
codeStream.pop();
}
} else {
SyntheticMethodBinding accessor = this.syntheticReadAccessors == null ? null : this.syntheticReadAccessors[this.syntheticReadAccessors.length - 1];
if (accessor == null) {
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, lastFieldBinding, getFinalReceiverType(), isFirst);
if (isStatic) {
codeStream.fieldAccess(Opcodes.OPC_getstatic, lastFieldBinding, constantPoolDeclaringClass);
} else {
codeStream.fieldAccess(Opcodes.OPC_getfield, lastFieldBinding, constantPoolDeclaringClass);
}
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, accessor, null /* default declaringClass */);
}
if (requiredGenericCast != null) codeStream.checkcast(requiredGenericCast);
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 : lastFieldBinding.type.id) {
case T_long :
case T_double :
codeStream.pop2();
break;
default :
codeStream.pop();
break;
}
}
}
int fieldPosition = (int) (this.sourcePositions[this.sourcePositions.length - 1] >>> 32);
codeStream.recordPositionsFrom(lastFieldPc, fieldPosition);
} 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) {
FieldBinding lastFieldBinding = generateReadSequence(currentScope, codeStream);
// check if compound assignment is the only usage of a private field
reportOnlyUselesslyReadPrivateField(currentScope, lastFieldBinding, valueRequired);
boolean isFirst = lastFieldBinding == this.binding
&& (this.indexOfFirstFieldBinding == 1 || lastFieldBinding.declaringClass == currentScope.enclosingReceiverType())
&& this.otherBindings == null; // could be dup: next.next.next
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, lastFieldBinding, getFinalReceiverType(), isFirst);
SyntheticMethodBinding accessor = this.syntheticReadAccessors == null ? null : this.syntheticReadAccessors[this.syntheticReadAccessors.length - 1];
if (lastFieldBinding.isStatic()) {
if (accessor == null) {
codeStream.fieldAccess(Opcodes.OPC_getstatic, lastFieldBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, accessor, null /* default declaringClass */);
}
} else {
codeStream.dup();
if (accessor == null) {
codeStream.fieldAccess(Opcodes.OPC_getfield, lastFieldBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, accessor, null /* default declaringClass */);
}
}
// the last field access is a write access
// perform the actual compound operation
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 :
TypeBinding requiredGenericCast = getGenericCast(this.otherBindings == null ? 0 : this.otherBindings.length);
if (requiredGenericCast != null) codeStream.checkcast(requiredGenericCast);
// 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);
}
// actual assignment
fieldStore(currentScope, codeStream, lastFieldBinding, this.syntheticWriteAccessor, getFinalReceiverType(), false /*implicit this*/, valueRequired);
// equivalent to valuesRequired[maxOtherBindings]
}
public void generatePostIncrement(BlockScope currentScope, CodeStream codeStream, CompoundAssignment postIncrement, boolean valueRequired) {
FieldBinding lastFieldBinding = generateReadSequence(currentScope, codeStream);
// check if this post increment is the only usage of a private field
reportOnlyUselesslyReadPrivateField(currentScope, lastFieldBinding, valueRequired);
boolean isFirst = lastFieldBinding == this.binding
&& (this.indexOfFirstFieldBinding == 1 || lastFieldBinding.declaringClass == currentScope.enclosingReceiverType())
&& this.otherBindings == null; // could be dup: next.next.next
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, lastFieldBinding, getFinalReceiverType(), isFirst);
SyntheticMethodBinding accessor = this.syntheticReadAccessors == null
? null
: this.syntheticReadAccessors[this.syntheticReadAccessors.length - 1];
if (lastFieldBinding.isStatic()) {
if (accessor == null) {
codeStream.fieldAccess(Opcodes.OPC_getstatic, lastFieldBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, accessor, constantPoolDeclaringClass);
}
} else {
codeStream.dup();
if (accessor == null) {
codeStream.fieldAccess(Opcodes.OPC_getfield, lastFieldBinding, null /* default declaringClass */);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, accessor, null /* default declaringClass */);
}
}
TypeBinding requiredGenericCast = getGenericCast(this.otherBindings == null ? 0 : this.otherBindings.length);
TypeBinding operandType;
if (requiredGenericCast != null) {
codeStream.checkcast(requiredGenericCast);
operandType = requiredGenericCast;
} else {
operandType = lastFieldBinding.type;
}
// duplicate the old field value
if (valueRequired) {
if (lastFieldBinding.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, lastFieldBinding, this.syntheticWriteAccessor, getFinalReceiverType(), false /*implicit this*/, false);
}
/*
* Generate code for all bindings (local and fields) excluding the last one, which may then be generated code
* for a read or write access.
*/
public FieldBinding generateReadSequence(BlockScope currentScope, CodeStream codeStream) {
// determine the rank until which we now we do not need any actual value for the field access
int otherBindingsCount = this.otherBindings == null ? 0 : this.otherBindings.length;
boolean needValue = otherBindingsCount == 0 || !this.otherBindings[0].isStatic();
FieldBinding lastFieldBinding;
TypeBinding lastGenericCast;
TypeBinding lastReceiverType;
boolean complyTo14 = currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4;
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD :
lastFieldBinding = ((FieldBinding) this.binding).original();
lastGenericCast = this.genericCast;
lastReceiverType = this.actualReceiverType;
// if first field is actually constant, we can inline it
if (lastFieldBinding.constant() != Constant.NotAConstant) {
break;
}
if ((needValue && !lastFieldBinding.isStatic()) || lastGenericCast != null) {
int pc = codeStream.position;
if ((this.bits & ASTNode.DepthMASK) != 0) {
ReferenceBinding targetType = currentScope.enclosingSourceType().enclosingTypeAt((this.bits & ASTNode.DepthMASK) >> ASTNode.DepthSHIFT);
Object[] emulationPath = currentScope.getEmulationPath(targetType, true /*only exact match*/, false/*consider enclosing arg*/);
codeStream.generateOuterAccess(emulationPath, this, targetType, currentScope);
} else {
generateReceiver(codeStream);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
break;
case Binding.LOCAL : // reading the first local variable
lastFieldBinding = null;
lastGenericCast = null;
LocalVariableBinding localBinding = (LocalVariableBinding) this.binding;
lastReceiverType = localBinding.type;
if (!needValue) break; // no value needed
// regular local variable read
Constant localConstant = localBinding.constant();
if (localConstant != Constant.NotAConstant) {
codeStream.generateConstant(localConstant, 0);
// no implicit conversion
} else {
// outer local?
if ((this.bits & ASTNode.DepthMASK) != 0) {
// outer local can be reached either through a synthetic arg or a synthetic field
VariableBinding[] path = currentScope.getEmulationPath(localBinding);
codeStream.generateOuterAccess(path, this, localBinding, currentScope);
} else {
codeStream.load(localBinding);
}
}
break;
default : // should not occur
return null;
}
// all intermediate field accesses are read accesses
// only the last field binding is a write access
int positionsLength = this.sourcePositions.length;
FieldBinding initialFieldBinding = lastFieldBinding; // can be null if initial was a local binding
if (this.otherBindings != null) {
for (int i = 0; i < otherBindingsCount; i++) {
int pc = codeStream.position;
FieldBinding nextField = this.otherBindings[i].original();
TypeBinding nextGenericCast = this.otherGenericCasts == null ? null : this.otherGenericCasts[i];
if (lastFieldBinding != null) {
needValue = !nextField.isStatic();
Constant fieldConstant = lastFieldBinding.constant();
if (fieldConstant != Constant.NotAConstant) {
if (i > 0 && !lastFieldBinding.isStatic()) {
codeStream.invokeObjectGetClass(); // perform null check
codeStream.pop();
}
if (needValue) {
codeStream.generateConstant(fieldConstant, 0);
}
} else {
if (needValue || (i > 0 && complyTo14) || lastGenericCast != null) {
MethodBinding accessor = this.syntheticReadAccessors == null ? null : this.syntheticReadAccessors[i];
if (accessor == null) {
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, lastFieldBinding, lastReceiverType, i == 0 && this.indexOfFirstFieldBinding == 1);
if (lastFieldBinding.isStatic()) {
codeStream.fieldAccess(Opcodes.OPC_getstatic, lastFieldBinding, constantPoolDeclaringClass);
} else {
codeStream.fieldAccess(Opcodes.OPC_getfield, lastFieldBinding, constantPoolDeclaringClass);
}
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, accessor, null /* default declaringClass */);
}
if (lastGenericCast != null) {
codeStream.checkcast(lastGenericCast);
lastReceiverType = lastGenericCast;
} else {
lastReceiverType = lastFieldBinding.type;
}
if (!needValue) codeStream.pop();
} else {
if (lastFieldBinding == initialFieldBinding) {
if (lastFieldBinding.isStatic()){
// if no valueRequired, still need possible side-effects of <clinit> invocation, if field belongs to different class
if (initialFieldBinding.declaringClass != this.actualReceiverType.erasure()) {
MethodBinding accessor = this.syntheticReadAccessors == null ? null : this.syntheticReadAccessors[i];
if (accessor == null) {
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, lastFieldBinding, lastReceiverType, i == 0 && this.indexOfFirstFieldBinding == 1);
codeStream.fieldAccess(Opcodes.OPC_getstatic, lastFieldBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, accessor, null /* default declaringClass */);
}
codeStream.pop();
}
}
} else if (!lastFieldBinding.isStatic()){
codeStream.invokeObjectGetClass(); // perform null check
codeStream.pop();
}
lastReceiverType = lastFieldBinding.type;
}
if ((positionsLength - otherBindingsCount + i - 1) >= 0) {
int fieldPosition = (int) (this.sourcePositions[positionsLength - otherBindingsCount + i - 1] >>>32);
codeStream.recordPositionsFrom(pc, fieldPosition);
}
}
}
lastFieldBinding = nextField;
lastGenericCast = nextGenericCast;
}
}
return lastFieldBinding;
}
public void generateReceiver(CodeStream codeStream) {
codeStream.aload_0();
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.InvocationSite#genericTypeArguments()
*/
public TypeBinding[] genericTypeArguments() {
return null;
}
protected FieldBinding getCodegenBinding(int index) {
if (index == 0){
return ((FieldBinding)this.binding).original();
} else {
return this.otherBindings[index-1].original();
}
}
/**
* Returns the receiver type for the final field in sequence (i.e. the return type of the previous binding)
* @return receiver type for the final field in sequence
*/
protected TypeBinding getFinalReceiverType() {
int otherBindingsCount = this.otherBindings == null ? 0 : this.otherBindings.length;
switch (otherBindingsCount) {
case 0 :
return this.actualReceiverType;
case 1 :
return this.genericCast != null ? this.genericCast : ((VariableBinding)this.binding).type;
default:
TypeBinding previousGenericCast = this.otherGenericCasts == null ? null : this.otherGenericCasts[otherBindingsCount-2];
return previousGenericCast != null ? previousGenericCast : this.otherBindings[otherBindingsCount-2].type;
}
}
// get the matching generic cast
protected TypeBinding getGenericCast(int index) {
if (index == 0){
return this.genericCast;
} else {
if (this.otherGenericCasts == null) return null;
return this.otherGenericCasts[index-1];
}
}
public TypeBinding getOtherFieldBindings(BlockScope scope) {
// At this point restrictiveFlag may ONLY have two potential value : FIELD LOCAL (i.e cast <<(VariableBinding) binding>> is valid)
int length = this.tokens.length;
FieldBinding field = ((this.bits & Binding.FIELD) != 0) ? (FieldBinding) this.binding : null;
TypeBinding type = ((VariableBinding) this.binding).type;
int index = this.indexOfFirstFieldBinding;
if (index == length) { // restrictiveFlag == FIELD
this.constant = ((FieldBinding) this.binding).constant();
// perform capture conversion if read access
return (type != null && (this.bits & ASTNode.IsStrictlyAssigned) == 0)
? type.capture(scope, this.sourceEnd)
: type;
}
// allocation of the fieldBindings array and its respective constants
int otherBindingsLength = length - index;
this.otherBindings = new FieldBinding[otherBindingsLength];
this.otherDepths = new int[otherBindingsLength];
// fill the first constant (the one of the binding)
this.constant = ((VariableBinding) this.binding).constant();
// save first depth, since will be updated by visibility checks of other bindings
int firstDepth = (this.bits & ASTNode.DepthMASK) >> ASTNode.DepthSHIFT;
// iteration on each field
while (index < length) {
char[] token = this.tokens[index];
if (type == null)
return null; // could not resolve type prior to this point
this.bits &= ~ASTNode.DepthMASK; // flush previous depth if any
FieldBinding previousField = field;
field = scope.getField(type.capture(scope, (int)this.sourcePositions[index]), token, this);
int place = index - this.indexOfFirstFieldBinding;
this.otherBindings[place] = field;
this.otherDepths[place] = (this.bits & ASTNode.DepthMASK) >> ASTNode.DepthSHIFT;
if (field.isValidBinding()) {
// set generic cast of for previous field (if any)
if (previousField != null) {
TypeBinding fieldReceiverType = type;
TypeBinding oldReceiverType = fieldReceiverType;
fieldReceiverType = fieldReceiverType.getErasureCompatibleType(field.declaringClass);// handle indirect inheritance thru variable secondary bound
FieldBinding originalBinding = previousField.original();
if (fieldReceiverType != oldReceiverType || originalBinding.type.leafComponentType().isTypeVariable()) { // record need for explicit cast at codegen
setGenericCast(index-1,originalBinding.type.genericCast(fieldReceiverType)); // type cannot be base-type even in boxing case
}
}
// only last field is actually a write access if any
if (isFieldUseDeprecated(field, scope, index+1 == length ? this.bits : 0)) {
scope.problemReporter().deprecatedField(field, this);
}
// constant propagation can only be performed as long as the previous one is a constant too.
if (this.constant != Constant.NotAConstant) {
this.constant = field.constant();
}
if (field.isStatic()) {
if ((field.modifiers & ClassFileConstants.AccEnum) != 0) { // enum constants are checked even when qualified)
ReferenceBinding declaringClass = field.original().declaringClass;
MethodScope methodScope = scope.methodScope();
SourceTypeBinding sourceType = methodScope.enclosingSourceType();
if ((this.bits & ASTNode.IsStrictlyAssigned) == 0
&& sourceType == declaringClass
&& methodScope.lastVisibleFieldID >= 0
&& field.id >= methodScope.lastVisibleFieldID
&& (!field.isStatic() || methodScope.isStatic)) {
scope.problemReporter().forwardReference(this, index, field);
}
// check if accessing enum static field in initializer
if ((sourceType == declaringClass || sourceType.superclass == declaringClass) // enum constant body
&& field.constant() == Constant.NotAConstant
&& !methodScope.isStatic
&& methodScope.isInsideInitializerOrConstructor()) {
scope.problemReporter().enumStaticFieldUsedDuringInitialization(field, this);
}
}
// static field accessed through receiver? legal but unoptimal (optional warning)
scope.problemReporter().nonStaticAccessToStaticField(this, field, index);
// indirect static reference ?
if (field.declaringClass != type) {
scope.problemReporter().indirectAccessToStaticField(this, field);
}
}
type = field.type;
index++;
} else {
this.constant = Constant.NotAConstant; //don't fill other constants slots...
scope.problemReporter().invalidField(this, field, index, type);
setDepth(firstDepth);
return null;
}
}
setDepth(firstDepth);
type = (this.otherBindings[otherBindingsLength - 1]).type;
// perform capture conversion if read access
return (type != null && (this.bits & ASTNode.IsStrictlyAssigned) == 0)
? type.capture(scope, this.sourceEnd)
: type;
}
public void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) {
//If inlinable field, forget the access emulation, the code gen will directly target it
if (((this.bits & ASTNode.DepthMASK) == 0) || (this.constant != Constant.NotAConstant)) {
return;
}
if ((this.bits & ASTNode.RestrictiveFlagMASK) == Binding.LOCAL) {
LocalVariableBinding localVariableBinding = (LocalVariableBinding) this.binding;
if (localVariableBinding != null) {
if ((localVariableBinding.tagBits & TagBits.NotInitialized) != 0) {
// local was tagged as uninitialized
return;
}
switch(localVariableBinding.useFlag) {
case LocalVariableBinding.FAKE_USED :
case LocalVariableBinding.USED :
currentScope.emulateOuterAccess(localVariableBinding);
}
}
}
}
/**
* index is <0 to denote write access emulation
*/
public void manageSyntheticAccessIfNecessary(BlockScope currentScope, FieldBinding fieldBinding, int index, FlowInfo flowInfo) {
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) != 0) return;
// index == 0 denotes the first fieldBinding, index > 0 denotes one of the 'otherBindings', index < 0 denotes a write access (to last binding)
if (fieldBinding.constant() != Constant.NotAConstant)
return;
if (fieldBinding.isPrivate()) { // private access
FieldBinding codegenField = getCodegenBinding(index < 0 ? (this.otherBindings == null ? 0 : this.otherBindings.length) : index);
ReferenceBinding declaringClass = codegenField.declaringClass;
if (declaringClass != currentScope.enclosingSourceType()) {
setSyntheticAccessor(fieldBinding, index, ((SourceTypeBinding) declaringClass).addSyntheticMethod(codegenField, index >= 0 /*read-access?*/, false /*not super access*/));
currentScope.problemReporter().needToEmulateFieldAccess(codegenField, this, index >= 0 /*read-access?*/);
return;
}
} else if (fieldBinding.isProtected()){
int depth = (index == 0 || (index < 0 && this.otherDepths == null))
? (this.bits & ASTNode.DepthMASK) >> ASTNode.DepthSHIFT
: this.otherDepths[index < 0 ? this.otherDepths.length-1 : index-1];
// implicit protected access
if (depth > 0 && (fieldBinding.declaringClass.getPackage() != currentScope.enclosingSourceType().getPackage())) {
FieldBinding codegenField = getCodegenBinding(index < 0 ? (this.otherBindings == null ? 0 : this.otherBindings.length) : index);
setSyntheticAccessor(fieldBinding, index,
((SourceTypeBinding) currentScope.enclosingSourceType().enclosingTypeAt(depth)).addSyntheticMethod(codegenField, index >= 0 /*read-access?*/, false /*not super access*/));
currentScope.problemReporter().needToEmulateFieldAccess(codegenField, this, index >= 0 /*read-access?*/);
return;
}
}
}
public int nullStatus(FlowInfo flowInfo) {
return FlowInfo.UNKNOWN;
}
public Constant optimizedBooleanConstant() {
switch (this.resolvedType.id) {
case T_boolean :
case T_JavaLangBoolean :
if (this.constant != Constant.NotAConstant) return this.constant;
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD : // reading a field
if (this.otherBindings == null)
return ((FieldBinding)this.binding).constant();
//$FALL-THROUGH$
case Binding.LOCAL : // reading a local variable
return this.otherBindings[this.otherBindings.length-1].constant();
}
}
return Constant.NotAConstant;
}
/**
* @see org.eclipse.jdt.internal.compiler.ast.Expression#postConversionType(Scope)
*/
public TypeBinding postConversionType(Scope scope) {
TypeBinding convertedType = this.resolvedType;
TypeBinding requiredGenericCast = getGenericCast(this.otherBindings == null ? 0 : this.otherBindings.length);
if (requiredGenericCast != null)
convertedType = requiredGenericCast;
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) {
for (int i = 0; i < this.tokens.length; i++) {
if (i > 0) output.append('.');
output.append(this.tokens[i]);
}
return output;
}
/**
* Normal field binding did not work, try to bind to a field of the delegate receiver.
*/
public TypeBinding reportError(BlockScope scope) {
if (this.binding instanceof ProblemFieldBinding) {
scope.problemReporter().invalidField(this, (FieldBinding) this.binding);
} else if (this.binding instanceof ProblemReferenceBinding || this.binding instanceof MissingTypeBinding) {
scope.problemReporter().invalidType(this, (TypeBinding) this.binding);
} else {
scope.problemReporter().unresolvableReference(this, this.binding);
}
return null;
}
public TypeBinding resolveType(BlockScope scope) {
// field and/or local are done before type lookups
// the only available value for the restrictiveFlag BEFORE
// the TC is Flag_Type Flag_LocalField and Flag_TypeLocalField
this.actualReceiverType = scope.enclosingReceiverType();
this.constant = Constant.NotAConstant;
if ((this.binding = scope.getBinding(this.tokens, this.bits & ASTNode.RestrictiveFlagMASK, this, true /*resolve*/)).isValidBinding()) {
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.VARIABLE : //============only variable===========
case Binding.TYPE | Binding.VARIABLE :
if (this.binding instanceof LocalVariableBinding) {
this.bits &= ~ASTNode.RestrictiveFlagMASK; // clear bits
this.bits |= Binding.LOCAL;
LocalVariableBinding local = (LocalVariableBinding) this.binding;
if (!local.isFinal() && ((this.bits & ASTNode.DepthMASK) != 0)) {
scope.problemReporter().cannotReferToNonFinalOuterLocal((LocalVariableBinding) this.binding, this);
}
if (local.type != null && (local.type.tagBits & TagBits.HasMissingType) != 0) {
// only complain if field reference (for local, its type got flagged already)
return null;
}
this.resolvedType = getOtherFieldBindings(scope);
if (this.resolvedType != null && (this.resolvedType.tagBits & TagBits.HasMissingType) != 0) {
FieldBinding lastField = this.otherBindings[this.otherBindings.length - 1];
scope.problemReporter().invalidField(this, new ProblemFieldBinding(lastField.declaringClass, lastField.name, ProblemReasons.NotFound), this.tokens.length, this.resolvedType.leafComponentType());
return null;
}
return this.resolvedType;
}
if (this.binding instanceof FieldBinding) {
this.bits &= ~ASTNode.RestrictiveFlagMASK; // clear bits
this.bits |= Binding.FIELD;
FieldBinding fieldBinding = (FieldBinding) this.binding;
MethodScope methodScope = scope.methodScope();
ReferenceBinding declaringClass = fieldBinding.original().declaringClass;
SourceTypeBinding sourceType = methodScope.enclosingSourceType();
// check for forward references
if ((this.indexOfFirstFieldBinding == 1 || (fieldBinding.modifiers & ClassFileConstants.AccEnum) != 0 || (!fieldBinding.isFinal() && declaringClass.isEnum())) // enum constants are checked even when qualified
&& sourceType == declaringClass
&& methodScope.lastVisibleFieldID >= 0
&& fieldBinding.id >= methodScope.lastVisibleFieldID
&& (!fieldBinding.isStatic() || methodScope.isStatic)) {
scope.problemReporter().forwardReference(this, this.indexOfFirstFieldBinding-1, fieldBinding);
}
if (isFieldUseDeprecated(fieldBinding, scope, this.indexOfFirstFieldBinding == this.tokens.length ? this.bits : 0)) {
scope.problemReporter().deprecatedField(fieldBinding, this);
}
if (fieldBinding.isStatic()) {
// only last field is actually a write access if any
// check if accessing enum static field in initializer
if (declaringClass.isEnum()) {
if ((sourceType == declaringClass || sourceType.superclass == declaringClass) // enum constant body
&& fieldBinding.constant() == Constant.NotAConstant
&& !methodScope.isStatic
&& methodScope.isInsideInitializerOrConstructor()) {
scope.problemReporter().enumStaticFieldUsedDuringInitialization(fieldBinding, this);
}
}
if (this.indexOfFirstFieldBinding > 1
&& fieldBinding.declaringClass != this.actualReceiverType
&& fieldBinding.declaringClass.canBeSeenBy(scope)) {
scope.problemReporter().indirectAccessToStaticField(this, fieldBinding);
}
} else {
if (this.indexOfFirstFieldBinding == 1 && scope.compilerOptions().getSeverity(CompilerOptions.UnqualifiedFieldAccess) != ProblemSeverities.Ignore) {
scope.problemReporter().unqualifiedFieldAccess(this, fieldBinding);
}
//must check for the static status....
if (this.indexOfFirstFieldBinding > 1 //accessing to a field using a type as "receiver" is allowed only with static field
|| scope.methodScope().isStatic) { // the field is the first token of the qualified reference....
scope.problemReporter().staticFieldAccessToNonStaticVariable(this, fieldBinding);
return null;
}
}
this.resolvedType = getOtherFieldBindings(scope);
if (this.resolvedType != null
&& (this.resolvedType.tagBits & TagBits.HasMissingType) != 0) {
FieldBinding lastField = this.indexOfFirstFieldBinding == this.tokens.length ? (FieldBinding)this.binding : this.otherBindings[this.otherBindings.length - 1];
scope.problemReporter().invalidField(this, new ProblemFieldBinding(lastField.declaringClass, lastField.name, ProblemReasons.NotFound), this.tokens.length, this.resolvedType.leafComponentType());
return null;
}
return this.resolvedType;
}
// thus it was a type
this.bits &= ~ASTNode.RestrictiveFlagMASK; // clear bits
this.bits |= Binding.TYPE;
//$FALL-THROUGH$
case Binding.TYPE : //=============only type ==============
TypeBinding type = (TypeBinding) this.binding;
// if (isTypeUseDeprecated(type, scope))
// scope.problemReporter().deprecatedType(type, this);
type = scope.environment().convertToRawType(type, false /*do not force conversion of enclosing types*/);
return this.resolvedType = type;
}
}
//========error cases===============
return this.resolvedType = reportError(scope);
}
public void setFieldIndex(int index) {
this.indexOfFirstFieldBinding = index;
}
// set the matching codegenBinding and generic cast
protected void setGenericCast(int index, TypeBinding someGenericCast) {
if (someGenericCast == null) return;
if (index == 0){
this.genericCast = someGenericCast;
} else {
if (this.otherGenericCasts == null) {
this.otherGenericCasts = new TypeBinding[this.otherBindings.length];
}
this.otherGenericCasts[index-1] = someGenericCast;
}
}
// set the matching synthetic accessor
protected void setSyntheticAccessor(FieldBinding fieldBinding, int index, SyntheticMethodBinding syntheticAccessor) {
if (index < 0) { // write-access ?
this.syntheticWriteAccessor = syntheticAccessor;
} else {
if (this.syntheticReadAccessors == null) {
this.syntheticReadAccessors = new SyntheticMethodBinding[this.otherBindings == null ? 1 : this.otherBindings.length + 1];
}
this.syntheticReadAccessors[index] = syntheticAccessor;
}
}
public void traverse(ASTVisitor visitor, BlockScope scope) {
visitor.visit(this, scope);
visitor.endVisit(this, scope);
}
public void traverse(ASTVisitor visitor, ClassScope scope) {
visitor.visit(this, scope);
visitor.endVisit(this, scope);
}
public String unboundReferenceErrorName() {
return new String(this.tokens[0]);
}
}