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package org.eclipse.jdt.internal.compiler.ast;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
import org.eclipse.jdt.internal.compiler.IAbstractSyntaxTreeVisitor;
import org.eclipse.jdt.internal.compiler.impl.*;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.lookup.*;
import org.eclipse.jdt.internal.compiler.problem.*;
import org.eclipse.jdt.internal.compiler.util.*;
public class InstanceOfExpression extends OperatorExpression {
public Expression expression;
public TypeReference type;
public InstanceOfExpression(Expression expression, TypeReference type, int operator) {
this.expression = expression;
this.type = type;
this.bits |= operator << OperatorSHIFT;
this.sourceStart = expression.sourceStart;
this.sourceEnd = type.sourceEnd;
}
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
return expression.analyseCode(currentScope, flowContext, flowInfo).unconditionalInits();
}
public final boolean areTypesCastCompatible(BlockScope scope, TypeBinding castTb, TypeBinding expressionTb) {
// see specifications p.68
//A more cpmplete version of this method is provided on
//CastExpression (it deals with constant and need runtime checkcast)
//by grammatical construction, the first test is ALWAYS false
//if (castTb.isBaseType())
//{ if (expressionTb.isBaseType())
// { if (expression.isConstantValueOfTypeAssignableToType(expressionTb,castTb))
// { return true;}
// else
// { if (expressionTb==castTb)
// { return true;}
// else
// { if (scope.areTypesCompatible(expressionTb,castTb))
// { return true; }
//
// if (BaseTypeBinding.isNarrowing(castTb.id,expressionTb.id))
// { return true;}
// return false;}}}
// else
// { return false; }}
//else
{ //-------------checkcast to something which is NOT a basetype----------------------------------
if (NullBinding == expressionTb)
//null is compatible with every thing ....
{
return true;
}
if (expressionTb.isArrayType()) {
if (castTb.isArrayType()) { //------- (castTb.isArray) expressionTb.isArray -----------
TypeBinding expressionEltTb = ((ArrayBinding) expressionTb).elementsType(scope);
if (expressionEltTb.isBaseType())
// <---stop the recursion-------
return ((ArrayBinding) castTb).elementsType(scope) == expressionEltTb;
//recursivly on the elts...
return areTypesCastCompatible(scope, ((ArrayBinding) castTb).elementsType(scope), expressionEltTb);
}
if (castTb.isClass()) { //------(castTb.isClass) expressionTb.isArray ---------------
if (scope.isJavaLangObject(castTb))
return true;
return false;
}
if (castTb.isInterface()) { //------- (castTb.isInterface) expressionTb.isArray -----------
if (scope.isJavaLangCloneable(castTb) || scope.isJavaIoSerializable(castTb)) {
return true;
}
return false;
}
//=========hoops=============
return false;
}
if (expressionTb.isBaseType()) {
return false;
}
if (expressionTb.isClass()) {
if (castTb.isArrayType()) { // ---- (castTb.isArray) expressionTb.isClass -------
if (scope.isJavaLangObject(expressionTb)) {
return true;
} else {
return false;
}
}
if (castTb.isClass()) { // ----- (castTb.isClass) expressionTb.isClass ------
if (scope.areTypesCompatible(expressionTb, castTb))
return true;
else {
if (scope.areTypesCompatible(castTb, expressionTb)) {
return true;
}
return false;
}
}
if (castTb.isInterface()) { // ----- (castTb.isInterface) expressionTb.isClass -------
if (((ReferenceBinding) expressionTb).isFinal()) { //no subclass for expressionTb, thus compile-time check is valid
if (scope.areTypesCompatible(expressionTb, castTb))
return true;
return false;
} else {
return true;
}
}
//=========hoops==============
return false;
}
if (expressionTb.isInterface()) {
if (castTb.isArrayType()) { // ----- (castTb.isArray) expressionTb.isInterface ------
if (scope.isJavaLangCloneable(expressionTb) || scope.isJavaIoSerializable(expressionTb))
//potential runtime error
{
return true;
}
return false;
}
if (castTb.isClass()) { // ----- (castTb.isClass) expressionTb.isInterface --------
if (scope.isJavaLangObject(castTb))
return true;
if (((ReferenceBinding) castTb).isFinal()) { //no subclass for castTb, thus compile-time check is valid
if (scope.areTypesCompatible(castTb, expressionTb)) {
return true;
}
return false;
}
return true;
}
if (castTb.isInterface()) { // ----- (castTb.isInterface) expressionTb.isInterface -------
if (castTb != expressionTb && (scope.compareTypes(castTb, expressionTb) == NotRelated)) {
MethodBinding[] castTbMethods = ((ReferenceBinding) castTb).methods();
int castTbMethodsLength = castTbMethods.length;
MethodBinding[] expressionTbMethods = ((ReferenceBinding) expressionTb).methods();
int expressionTbMethodsLength = expressionTbMethods.length;
for (int i = 0; i < castTbMethodsLength; i++) {
for (int j = 0; j < expressionTbMethodsLength; j++) {
if (castTbMethods[i].selector == expressionTbMethods[j].selector) {
if (castTbMethods[i].returnType != expressionTbMethods[j].returnType) {
if (castTbMethods[i].areParametersEqual(expressionTbMethods[j])) {
return false;
}
}
}
}
}
}
return true;
}
//============hoops===========
return false;
} // true;}
//=======hoops==========
return false;
}
}
/**
* Code generation for instanceOfExpression
*
* @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;
expression.generateCode(currentScope, codeStream, true);
codeStream.instance_of(type.binding);
if (!valueRequired)
codeStream.pop();
codeStream.recordPositionsFrom(pc, this);
}
public TypeBinding resolveType(BlockScope scope) {
constant = NotAConstant;
TypeBinding expressionTb = expression.resolveType(scope);
TypeBinding checkTb = type.resolveType(scope);
if (expressionTb == null || checkTb == null)
return null;
//===== by grammatical construction, the next test is always false =====
//if (checkTb.isBaseType()) {
// scope.problemReporter().invalidTypeError(type,checkTb);
// return null;
//}
if (!areTypesCastCompatible(scope, checkTb, expressionTb)) {
scope.problemReporter().notCompatibleTypesError(this, expressionTb, checkTb);
return null;
}
return BooleanBinding;
}
public String toStringExpressionNoParenthesis(){
/* slow code*/
return expression.toStringExpression() + " instanceof "/*nonNLS*/ +
type.toString(0) ; }
public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
if (visitor.visit(this, scope)) {
expression.traverse(visitor, scope);
type.traverse(visitor, scope);
}
visitor.endVisit(this, scope);
}
}
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