/*******************************************************************************
* Copyright (c) 2000, 2008 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.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.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeIds;
public class ArrayReference extends Reference {
public Expression receiver;
public Expression position;
public ArrayReference(Expression rec, Expression pos) {
this.receiver= rec;
this.position= pos;
this.sourceStart= rec.sourceStart;
}
public FlowInfo analyseAssignment(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo, Assignment assignment, boolean compoundAssignment) {
// TODO (maxime) optimization: unconditionalInits is applied to all existing calls
if (assignment.expression == null) {
return analyseCode(currentScope, flowContext, flowInfo);
}
return assignment.expression
.analyseCode(
currentScope,
flowContext,
analyseCode(currentScope, flowContext, flowInfo).unconditionalInits());
}
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
this.receiver.checkNPE(currentScope, flowContext, flowInfo);
flowInfo= this.receiver.analyseCode(currentScope, flowContext, flowInfo);
return this.position.analyseCode(currentScope, flowContext, flowInfo);
}
public void generateAssignment(BlockScope currentScope, CodeStream codeStream, Assignment assignment, boolean valueRequired) {
int pc= codeStream.position;
this.receiver.generateCode(currentScope, codeStream, true);
if (this.receiver instanceof CastExpression // ((type[])null)[0]
&& ((CastExpression)this.receiver).innermostCastedExpression().resolvedType == TypeBinding.NULL) {
codeStream.checkcast(this.receiver.resolvedType);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
this.position.generateCode(currentScope, codeStream, true);
assignment.expression.generateCode(currentScope, codeStream, true);
codeStream.arrayAtPut(this.resolvedType.id, valueRequired);
if (valueRequired) {
codeStream.generateImplicitConversion(assignment.implicitConversion);
}
}
/**
* Code generation for a array reference
*/
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
int pc= codeStream.position;
this.receiver.generateCode(currentScope, codeStream, true);
if (this.receiver instanceof CastExpression // ((type[])null)[0]
&& ((CastExpression)this.receiver).innermostCastedExpression().resolvedType == TypeBinding.NULL) {
codeStream.checkcast(this.receiver.resolvedType);
}
this.position.generateCode(currentScope, codeStream, true);
codeStream.arrayAt(this.resolvedType.id);
// Generating code for the potential runtime type checking
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 : this.resolvedType.id) {
case T_long:
case T_double:
codeStream.pop2();
break;
default:
codeStream.pop();
}
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
public void generateCompoundAssignment(BlockScope currentScope, CodeStream codeStream, Expression expression, int operator, int assignmentImplicitConversion, boolean valueRequired) {
this.receiver.generateCode(currentScope, codeStream, true);
if (this.receiver instanceof CastExpression // ((type[])null)[0]
&& ((CastExpression)this.receiver).innermostCastedExpression().resolvedType == TypeBinding.NULL) {
codeStream.checkcast(this.receiver.resolvedType);
}
this.position.generateCode(currentScope, codeStream, true);
codeStream.dup2();
codeStream.arrayAt(this.resolvedType.id);
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:
// 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);
}
codeStream.arrayAtPut(this.resolvedType.id, valueRequired);
}
public void generatePostIncrement(BlockScope currentScope, CodeStream codeStream, CompoundAssignment postIncrement, boolean valueRequired) {
this.receiver.generateCode(currentScope, codeStream, true);
if (this.receiver instanceof CastExpression // ((type[])null)[0]
&& ((CastExpression)this.receiver).innermostCastedExpression().resolvedType == TypeBinding.NULL) {
codeStream.checkcast(this.receiver.resolvedType);
}
this.position.generateCode(currentScope, codeStream, true);
codeStream.dup2();
codeStream.arrayAt(this.resolvedType.id);
if (valueRequired) {
switch (this.resolvedType.id) {
case TypeIds.T_long:
case TypeIds.T_double:
codeStream.dup2_x2();
break;
default:
codeStream.dup_x2();
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);
codeStream.arrayAtPut(this.resolvedType.id, false);
}
public int nullStatus(FlowInfo flowInfo) {
return FlowInfo.UNKNOWN;
}
public StringBuffer printExpression(int indent, StringBuffer output) {
this.receiver.printExpression(0, output).append('[');
return this.position.printExpression(0, output).append(']');
}
public TypeBinding resolveType(BlockScope scope) {
this.constant= Constant.NotAConstant;
if (this.receiver instanceof CastExpression // no cast check for ((type[])null)[0]
&& ((CastExpression)this.receiver).innermostCastedExpression() instanceof NullLiteral) {
this.receiver.bits|= ASTNode.DisableUnnecessaryCastCheck; // will check later on
}
TypeBinding arrayType= this.receiver.resolveType(scope);
if (arrayType != null) {
this.receiver.computeConversion(scope, arrayType, arrayType);
if (arrayType.isArrayType()) {
TypeBinding elementType= ((ArrayBinding)arrayType).elementsType();
this.resolvedType= ((this.bits & ASTNode.IsStrictlyAssigned) == 0) ? elementType.capture(scope, this.sourceEnd) : elementType;
} else {
scope.problemReporter().referenceMustBeArrayTypeAt(arrayType, this);
}
}
TypeBinding positionType= this.position.resolveTypeExpecting(scope, TypeBinding.INT);
if (positionType != null) {
this.position.computeConversion(scope, TypeBinding.INT, positionType);
}
return this.resolvedType;
}
public void traverse(ASTVisitor visitor, BlockScope scope) {
if (visitor.visit(this, scope)) {
this.receiver.traverse(visitor, scope);
this.position.traverse(visitor, scope);
}
visitor.endVisit(this, scope);
}
}