/*******************************************************************************
* Copyright (c) 2000, 2009 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
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
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.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.ArrayBinding;
import org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.ExtraCompilerModifiers;
import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
import org.eclipse.jdt.internal.compiler.lookup.TagBits;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
public class LocalDeclaration extends AbstractVariableDeclaration {
public LocalVariableBinding binding;
public LocalDeclaration(
char[] name,
int sourceStart,
int sourceEnd) {
this.name= name;
this.sourceStart= sourceStart;
this.sourceEnd= sourceEnd;
this.declarationEnd= sourceEnd;
}
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
// record variable initialization if any
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0) {
this.bits|= ASTNode.IsLocalDeclarationReachable; // only set if actually reached
}
if (this.initialization == null) {
return flowInfo;
}
int nullStatus= this.initialization.nullStatus(flowInfo);
flowInfo=
this.initialization
.analyseCode(currentScope, flowContext, flowInfo)
.unconditionalInits();
if (!flowInfo.isDefinitelyAssigned(this.binding)) {// for local variable debug attributes
this.bits|= FirstAssignmentToLocal;
} else {
this.bits&= ~FirstAssignmentToLocal; // int i = (i = 0);
}
flowInfo.markAsDefinitelyAssigned(this.binding);
if ((this.binding.type.tagBits & TagBits.IsBaseType) == 0) {
switch (nullStatus) {
case FlowInfo.NULL:
flowInfo.markAsDefinitelyNull(this.binding);
break;
case FlowInfo.NON_NULL:
flowInfo.markAsDefinitelyNonNull(this.binding);
break;
default:
flowInfo.markAsDefinitelyUnknown(this.binding);
}
// no need to inform enclosing try block since its locals won't get
// known by the finally block
}
return flowInfo;
}
public void checkModifiers() {
//only potential valid modifier is <<final>>
if (((this.modifiers & ExtraCompilerModifiers.AccJustFlag) & ~ClassFileConstants.AccFinal) != 0)
//AccModifierProblem -> other (non-visibility problem)
//AccAlternateModifierProblem -> duplicate modifier
//AccModifierProblem | AccAlternateModifierProblem -> visibility problem"
this.modifiers= (this.modifiers & ~ExtraCompilerModifiers.AccAlternateModifierProblem) | ExtraCompilerModifiers.AccModifierProblem;
}
/**
* Code generation for a local declaration: i.e. normal assignment to a local variable +
* unused variable handling
*/
public void generateCode(BlockScope currentScope, CodeStream codeStream) {
// even if not reachable, variable must be added to visible if allocated (28298)
if (this.binding.resolvedPosition != -1) {
codeStream.addVisibleLocalVariable(this.binding);
}
if ((this.bits & IsReachable) == 0) {
return;
}
int pc= codeStream.position;
// something to initialize?
generateInit: {
if (this.initialization == null)
break generateInit;
// forget initializing unused or final locals set to constant value (final ones are inlined)
if (this.binding.resolvedPosition < 0) {
if (this.initialization.constant != Constant.NotAConstant)
break generateInit;
// if binding unused generate then discard the value
this.initialization.generateCode(currentScope, codeStream, false);
break generateInit;
}
this.initialization.generateCode(currentScope, codeStream, true);
// 26903, need extra cast to store null in array local var
if (this.binding.type.isArrayType()
&& (this.initialization.resolvedType == TypeBinding.NULL // arrayLoc = null
|| ((this.initialization instanceof CastExpression) // arrayLoc = (type[])null
&& (((CastExpression)this.initialization).innermostCastedExpression().resolvedType == TypeBinding.NULL)))) {
codeStream.checkcast(this.binding.type);
}
codeStream.store(this.binding, false);
if ((this.bits & ASTNode.FirstAssignmentToLocal) != 0) {
/* Variable may have been initialized during the code initializing it
e.g. int i = (i = 1);
*/
this.binding.recordInitializationStartPC(codeStream.position);
}
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
/**
* @see org.eclipse.jdt.internal.compiler.ast.AbstractVariableDeclaration#getKind()
*/
public int getKind() {
return LOCAL_VARIABLE;
}
public void resolve(BlockScope scope) {
// create a binding and add it to the scope
TypeBinding variableType= this.type.resolveType(scope, true /* check bounds*/);
checkModifiers();
if (variableType != null) {
if (variableType == TypeBinding.VOID) {
scope.problemReporter().variableTypeCannotBeVoid(this);
return;
}
if (variableType.isArrayType() && ((ArrayBinding)variableType).leafComponentType == TypeBinding.VOID) {
scope.problemReporter().variableTypeCannotBeVoidArray(this);
return;
}
}
Binding existingVariable= scope.getBinding(this.name, Binding.VARIABLE, this, false /*do not resolve hidden field*/);
if (existingVariable != null && existingVariable.isValidBinding()) {
if (existingVariable instanceof LocalVariableBinding && this.hiddenVariableDepth == 0) {
scope.problemReporter().redefineLocal(this);
} else {
scope.problemReporter().localVariableHiding(this, existingVariable, false);
}
}
if ((this.modifiers & ClassFileConstants.AccFinal) != 0 && this.initialization == null) {
this.modifiers|= ExtraCompilerModifiers.AccBlankFinal;
}
this.binding= new LocalVariableBinding(this, variableType, this.modifiers, false);
scope.addLocalVariable(this.binding);
this.binding.setConstant(Constant.NotAConstant);
// allow to recursivelly target the binding....
// the correct constant is harmed if correctly computed at the end of this method
if (variableType == null) {
if (this.initialization != null)
this.initialization.resolveType(scope); // want to report all possible errors
return;
}
// store the constant for final locals
if (this.initialization != null) {
if (this.initialization instanceof ArrayInitializer) {
TypeBinding initializationType= this.initialization.resolveTypeExpecting(scope, variableType);
if (initializationType != null) {
((ArrayInitializer)this.initialization).binding= (ArrayBinding)initializationType;
this.initialization.computeConversion(scope, variableType, initializationType);
}
} else {
this.initialization.setExpectedType(variableType);
TypeBinding initializationType= this.initialization.resolveType(scope);
if (initializationType != null) {
if (variableType != initializationType) // must call before computeConversion() and typeMismatchError()
scope.compilationUnitScope().recordTypeConversion(variableType, initializationType);
if (this.initialization.isConstantValueOfTypeAssignableToType(initializationType, variableType)
|| initializationType.isCompatibleWith(variableType)) {
this.initialization.computeConversion(scope, variableType, initializationType);
if (initializationType.needsUncheckedConversion(variableType)) {
scope.problemReporter().unsafeTypeConversion(this.initialization, initializationType, variableType);
}
if (this.initialization instanceof CastExpression
&& (this.initialization.bits & ASTNode.UnnecessaryCast) == 0) {
CastExpression.checkNeedForAssignedCast(scope, variableType, (CastExpression)this.initialization);
}
} else if (isBoxingCompatible(initializationType, variableType, this.initialization, scope)) {
this.initialization.computeConversion(scope, variableType, initializationType);
if (this.initialization instanceof CastExpression
&& (this.initialization.bits & ASTNode.UnnecessaryCast) == 0) {
CastExpression.checkNeedForAssignedCast(scope, variableType, (CastExpression)this.initialization);
}
} else {
if ((variableType.tagBits & TagBits.HasMissingType) == 0) {
// if problem already got signaled on type, do not report secondary problem
scope.problemReporter().typeMismatchError(initializationType, variableType, this.initialization, null);
}
}
}
}
// check for assignment with no effect
if (this.binding == Expression.getDirectBinding(this.initialization)) {
scope.problemReporter().assignmentHasNoEffect(this, this.name);
}
// change the constant in the binding when it is final
// (the optimization of the constant propagation will be done later on)
// cast from constant actual type to variable type
this.binding.setConstant(
this.binding.isFinal()
? this.initialization.constant.castTo((variableType.id << 4) + this.initialization.constant.typeID())
: Constant.NotAConstant);
}
// only resolve annotation at the end, for constant to be positioned before (96991)
resolveAnnotations(scope, this.annotations, this.binding);
}
public void traverse(ASTVisitor visitor, BlockScope scope) {
if (visitor.visit(this, scope)) {
if (this.annotations != null) {
int annotationsLength= this.annotations.length;
for (int i= 0; i < annotationsLength; i++)
this.annotations[i].traverse(visitor, scope);
}
this.type.traverse(visitor, scope);
if (this.initialization != null)
this.initialization.traverse(visitor, scope);
}
visitor.endVisit(this, scope);
}
}