/*
* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.bcel.verifier.structurals;
import org.apache.bcel.Constants;
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.Constant;
import org.apache.bcel.classfile.ConstantClass;
import org.apache.bcel.classfile.ConstantDouble;
import org.apache.bcel.classfile.ConstantFieldref;
import org.apache.bcel.classfile.ConstantFloat;
import org.apache.bcel.classfile.ConstantInteger;
import org.apache.bcel.classfile.ConstantLong;
import org.apache.bcel.classfile.ConstantString;
import org.apache.bcel.classfile.Field;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.generic.*;
import org.apache.bcel.verifier.VerificationResult;
import org.apache.bcel.verifier.Verifier;
import org.apache.bcel.verifier.VerifierFactory;
import org.apache.bcel.verifier.exc.AssertionViolatedException;
import org.apache.bcel.verifier.exc.StructuralCodeConstraintException;
/**
* A Visitor class testing for valid preconditions of JVM instructions.
* The instance of this class will throw a StructuralCodeConstraintException
* instance if an instruction is visitXXX()ed which has preconditions that are
* not satisfied.
* TODO: Currently, the JVM's behaviour concerning monitors (MONITORENTER,
* MONITOREXIT) is not modeled in JustIce.
*
* @version $Id: InstConstraintVisitor.java,v 1.9 2004/12/15 08:28:55 conor Exp $
* @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
* @see org.apache.bcel.verifier.exc.StructuralCodeConstraintException
* @see org.apache.bcel.verifier.exc.LinkingConstraintException
*/
public class InstConstraintVisitor extends EmptyVisitor implements org.apache.bcel.generic.Visitor{
private static ObjectType GENERIC_ARRAY = new ObjectType("org.apache.bcel.verifier.structurals.GenericArray");
/**
* The constructor. Constructs a new instance of this class.
*/
public InstConstraintVisitor(){}
/**
* The Execution Frame we're working on.
*
* @see #setFrame(Frame f)
* @see #locals()
* @see #stack()
*/
private Frame frame = null;
/**
* The ConstantPoolGen we're working on.
*
* @see #setConstantPoolGen(ConstantPoolGen cpg)
*/
private ConstantPoolGen cpg = null;
/**
* The MethodGen we're working on.
*
* @see #setMethodGen(MethodGen mg)
*/
private MethodGen mg = null;
/**
* The OperandStack we're working on.
*
* @see #setFrame(Frame f)
*/
private OperandStack stack(){
return frame.getStack();
}
/**
* The LocalVariables we're working on.
*
* @see #setFrame(Frame f)
*/
private LocalVariables locals(){
return frame.getLocals();
}
/**
* This method is called by the visitXXX() to notify the acceptor of this InstConstraintVisitor
* that a constraint violation has occured. This is done by throwing an instance of a
* StructuralCodeConstraintException.
* @throws org.apache.bcel.verifier.exc.StructuralCodeConstraintException always.
*/
private void constraintViolated(Instruction violator, String description){
String fq_classname = violator.getClass().getName();
throw new StructuralCodeConstraintException("Instruction "+ fq_classname.substring(fq_classname.lastIndexOf('.')+1) +" constraint violated: " + description);
}
/**
* This returns the single instance of the InstConstraintVisitor class.
* To operate correctly, other values must have been set before actually
* using the instance.
* Use this method for performance reasons.
*
* @see #setConstantPoolGen(ConstantPoolGen cpg)
* @see #setMethodGen(MethodGen mg)
*/
public void setFrame(Frame f){
this.frame = f;
//if (singleInstance.mg == null || singleInstance.cpg == null) throw new AssertionViolatedException("Forgot to set important values first.");
}
/**
* Sets the ConstantPoolGen instance needed for constraint
* checking prior to execution.
*/
public void setConstantPoolGen(ConstantPoolGen cpg){
this.cpg = cpg;
}
/**
* Sets the MethodGen instance needed for constraint
* checking prior to execution.
*/
public void setMethodGen(MethodGen mg){
this.mg = mg;
}
/**
* Assures index is of type INT.
* @throws org.apache.bcel.verifier.exc.StructuralCodeConstraintException if the above constraint is not satisfied.
*/
private void indexOfInt(Instruction o, Type index){
if (! index.equals(Type.INT))
constraintViolated(o, "The 'index' is not of type int but of type "+index+".");
}
/**
* Assures the ReferenceType r is initialized (or Type.NULL).
* Formally, this means (!(r instanceof UninitializedObjectType)), because
* there are no uninitialized array types.
* @throws org.apache.bcel.verifier.exc.StructuralCodeConstraintException if the above constraint is not satisfied.
*/
private void referenceTypeIsInitialized(Instruction o, ReferenceType r){
if (r instanceof UninitializedObjectType){
constraintViolated(o, "Working on an uninitialized object '"+r+"'.");
}
}
/** Assures value is of type INT. */
private void valueOfInt(Instruction o, Type value){
if (! value.equals(Type.INT))
constraintViolated(o, "The 'value' is not of type int but of type "+value+".");
}
/**
* Assures arrayref is of ArrayType or NULL;
* returns true if and only if arrayref is non-NULL.
* @throws org.apache.bcel.verifier.exc.StructuralCodeConstraintException if the above constraint is violated.
*/
private boolean arrayrefOfArrayType(Instruction o, Type arrayref){
if (! ((arrayref instanceof ArrayType) || arrayref.equals(Type.NULL)) )
constraintViolated(o, "The 'arrayref' does not refer to an array but is of type "+arrayref+".");
return (arrayref instanceof ArrayType);
}
/***************************************************************/
/* MISC */
/***************************************************************/
/**
* Ensures the general preconditions of an instruction that accesses the stack.
* This method is here because BCEL has no such superinterface for the stack
* accessing instructions; and there are funny unexpected exceptions in the
* semantices of the superinterfaces and superclasses provided.
* E.g. SWAP is a StackConsumer, but DUP_X1 is not a StackProducer.
* Therefore, this method is called by all StackProducer, StackConsumer,
* and StackInstruction instances via their visitXXX() method.
* Unfortunately, as the superclasses and superinterfaces overlap, some instructions
* cause this method to be called two or three times. [TODO: Fix this.]
*
* @see #visitStackConsumer(StackConsumer o)
* @see #visitStackProducer(StackProducer o)
* @see #visitStackInstruction(StackInstruction o)
*/
private void _visitStackAccessor(Instruction o){
int consume = o.consumeStack(cpg); // Stack values are always consumed first; then produced.
if (consume > stack().slotsUsed()){
constraintViolated((Instruction) o, "Cannot consume "+consume+" stack slots: only "+stack().slotsUsed()+" slot(s) left on stack!\nStack:\n"+stack());
}
int produce = o.produceStack(cpg) - ((Instruction) o).consumeStack(cpg); // Stack values are always consumed first; then produced.
if ( produce + stack().slotsUsed() > stack().maxStack() ){
constraintViolated((Instruction) o, "Cannot produce "+produce+" stack slots: only "+(stack().maxStack()-stack().slotsUsed())+" free stack slot(s) left.\nStack:\n"+stack());
}
}
/***************************************************************/
/* "generic"visitXXXX methods where XXXX is an interface */
/* therefore, we don't know the order of visiting; but we know */
/* these methods are called before the visitYYYY methods below */
/***************************************************************/
/**
* Assures the generic preconditions of a LoadClass instance.
* The referenced class is loaded and pass2-verified.
*/
public void visitLoadClass(LoadClass o){
ObjectType t = o.getLoadClassType(cpg);
if (t != null){// null means "no class is loaded"
Verifier v = VerifierFactory.getVerifier(t.getClassName());
VerificationResult vr = v.doPass2();
if (vr.getStatus() != VerificationResult.VERIFIED_OK){
constraintViolated((Instruction) o, "Class '"+o.getLoadClassType(cpg).getClassName()+"' is referenced, but cannot be loaded and resolved: '"+vr+"'.");
}
}
}
/**
* Ensures the general preconditions of a StackConsumer instance.
*/
public void visitStackConsumer(StackConsumer o){
_visitStackAccessor((Instruction) o);
}
/**
* Ensures the general preconditions of a StackProducer instance.
*/
public void visitStackProducer(StackProducer o){
_visitStackAccessor((Instruction) o);
}
/***************************************************************/
/* "generic" visitYYYY methods where YYYY is a superclass. */
/* therefore, we know the order of visiting; we know */
/* these methods are called after the visitXXXX methods above. */
/***************************************************************/
/**
* Ensures the general preconditions of a CPInstruction instance.
*/
public void visitCPInstruction(CPInstruction o){
int idx = o.getIndex();
if ((idx < 0) || (idx >= cpg.getSize())){
throw new AssertionViolatedException("Huh?! Constant pool index of instruction '"+o+"' illegal? Pass 3a should have checked this!");
}
}
/**
* Ensures the general preconditions of a FieldInstruction instance.
*/
public void visitFieldInstruction(FieldInstruction o){
// visitLoadClass(o) has been called before: Every FieldOrMethod
// implements LoadClass.
// visitCPInstruction(o) has been called before.
// A FieldInstruction may be: GETFIELD, GETSTATIC, PUTFIELD, PUTSTATIC
Constant c = cpg.getConstant(o.getIndex());
if (!(c instanceof ConstantFieldref)){
constraintViolated(o, "Index '"+o.getIndex()+"' should refer to a CONSTANT_Fieldref_info structure, but refers to '"+c+"'.");
}
// the o.getClassType(cpg) type has passed pass 2; see visitLoadClass(o).
Type t = o.getType(cpg);
if (t instanceof ObjectType){
String name = ((ObjectType)t).getClassName();
Verifier v = VerifierFactory.getVerifier( name );
VerificationResult vr = v.doPass2();
if (vr.getStatus() != VerificationResult.VERIFIED_OK){
constraintViolated((Instruction) o, "Class '"+name+"' is referenced, but cannot be loaded and resolved: '"+vr+"'.");
}
}
}
/**
* Ensures the general preconditions of an InvokeInstruction instance.
*/
public void visitInvokeInstruction(InvokeInstruction o){
// visitLoadClass(o) has been called before: Every FieldOrMethod
// implements LoadClass.
// visitCPInstruction(o) has been called before.
//TODO
}
/**
* Ensures the general preconditions of a StackInstruction instance.
*/
public void visitStackInstruction(StackInstruction o){
_visitStackAccessor(o);
}
/**
* Assures the generic preconditions of a LocalVariableInstruction instance.
* That is, the index of the local variable must be valid.
*/
public void visitLocalVariableInstruction(LocalVariableInstruction o){
if (locals().maxLocals() <= (o.getType(cpg).getSize()==1? o.getIndex() : o.getIndex()+1) ){
constraintViolated(o, "The 'index' is not a valid index into the local variable array.");
}
}
/**
* Assures the generic preconditions of a LoadInstruction instance.
*/
public void visitLoadInstruction(LoadInstruction o){
//visitLocalVariableInstruction(o) is called before, because it is more generic.
// LOAD instructions must not read Type.UNKNOWN
if (locals().get(o.getIndex()) == Type.UNKNOWN){
constraintViolated(o, "Read-Access on local variable "+o.getIndex()+" with unknown content.");
}
// LOAD instructions, two-slot-values at index N must have Type.UNKNOWN
// as a symbol for the higher halve at index N+1
// [suppose some instruction put an int at N+1--- our double at N is defective]
if (o.getType(cpg).getSize() == 2){
if (locals().get(o.getIndex()+1) != Type.UNKNOWN){
constraintViolated(o, "Reading a two-locals value from local variables "+o.getIndex()+" and "+(o.getIndex()+1)+" where the latter one is destroyed.");
}
}
// LOAD instructions must read the correct type.
if (!(o instanceof ALOAD)){
if (locals().get(o.getIndex()) != o.getType(cpg) ){
constraintViolated(o, "Local Variable type and LOADing Instruction type mismatch: Local Variable: '"+locals().get(o.getIndex())+"'; Instruction type: '"+o.getType(cpg)+"'.");
}
}
else{ // we deal with an ALOAD
if (!(locals().get(o.getIndex()) instanceof ReferenceType)){
constraintViolated(o, "Local Variable type and LOADing Instruction type mismatch: Local Variable: '"+locals().get(o.getIndex())+"'; Instruction expects a ReferenceType.");
}
// ALOAD __IS ALLOWED__ to put uninitialized objects onto the stack!
//referenceTypeIsInitialized(o, (ReferenceType) (locals().get(o.getIndex())));
}
// LOAD instructions must have enough free stack slots.
if ((stack().maxStack() - stack().slotsUsed()) < o.getType(cpg).getSize()){
constraintViolated(o, "Not enough free stack slots to load a '"+o.getType(cpg)+"' onto the OperandStack.");
}
}
/**
* Assures the generic preconditions of a StoreInstruction instance.
*/
public void visitStoreInstruction(StoreInstruction o){
//visitLocalVariableInstruction(o) is called before, because it is more generic.
if (stack().isEmpty()){ // Don't bother about 1 or 2 stack slots used. This check is implicitely done below while type checking.
constraintViolated(o, "Cannot STORE: Stack to read from is empty.");
}
if ( (!(o instanceof ASTORE)) ){
if (! (stack().peek() == o.getType(cpg)) ){// the other xSTORE types are singletons in BCEL.
constraintViolated(o, "Stack top type and STOREing Instruction type mismatch: Stack top: '"+stack().peek()+"'; Instruction type: '"+o.getType(cpg)+"'.");
}
}
else{ // we deal with ASTORE
Type stacktop = stack().peek();
if ( (!(stacktop instanceof ReferenceType)) && (!(stacktop instanceof ReturnaddressType)) ){
constraintViolated(o, "Stack top type and STOREing Instruction type mismatch: Stack top: '"+stack().peek()+"'; Instruction expects a ReferenceType or a ReturnadressType.");
}
if (stacktop instanceof ReferenceType){
referenceTypeIsInitialized(o, (ReferenceType) stacktop);
}
}
}
/**
* Assures the generic preconditions of a ReturnInstruction instance.
*/
public void visitReturnInstruction(ReturnInstruction o){
Type method_type = mg.getType();
if (method_type == Type.BOOLEAN ||
method_type == Type.BYTE ||
method_type == Type.SHORT ||
method_type == Type.CHAR){
method_type = Type.INT;
}
if (o instanceof RETURN){
if (method_type != Type.VOID){
constraintViolated(o, "RETURN instruction in non-void method.");
}
else{
return;
}
}
if (o instanceof ARETURN){
if (stack().peek() == Type.NULL){
return;
}
else{
if (! (stack().peek() instanceof ReferenceType)){
constraintViolated(o, "Reference type expected on top of stack, but is: '"+stack().peek()+"'.");
}
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek()));
//ReferenceType objectref = (ReferenceType) (stack().peek());
// TODO: This can only be checked if using Staerk-et-al's "set of object types" instead of a
// "wider cast object type" created during verification.
//if (! (objectref.isAssignmentCompatibleWith(mg.getType())) ){
// constraintViolated(o, "Type on stack top which should be returned is a '"+stack().peek()+"' which is not assignment compatible with the return type of this method, '"+mg.getType()+"'.");
//}
}
}
else{
if (! ( method_type.equals( stack().peek() ))){
constraintViolated(o, "Current method has return type of '"+mg.getType()+"' expecting a '"+method_type+"' on top of the stack. But stack top is a '"+stack().peek()+"'.");
}
}
}
/***************************************************************/
/* "special"visitXXXX methods for one type of instruction each */
/***************************************************************/
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitAALOAD(AALOAD o){
Type arrayref = stack().peek(1);
Type index = stack().peek(0);
indexOfInt(o, index);
if (arrayrefOfArrayType(o, arrayref)){
if (! (((ArrayType) arrayref).getElementType() instanceof ReferenceType)){
constraintViolated(o, "The 'arrayref' does not refer to an array with elements of a ReferenceType but to an array of "+((ArrayType) arrayref).getElementType()+".");
}
referenceTypeIsInitialized(o, (ReferenceType) (((ArrayType) arrayref).getElementType()));
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitAASTORE(AASTORE o){
try {
Type arrayref = stack().peek(2);
Type index = stack().peek(1);
Type value = stack().peek(0);
indexOfInt(o, index);
if (!(value instanceof ReferenceType)){
constraintViolated(o, "The 'value' is not of a ReferenceType but of type "+value+".");
}else{
referenceTypeIsInitialized(o, (ReferenceType) value);
}
// Don't bother further with "referenceTypeIsInitialized()", there are no arrays
// of an uninitialized object type.
if (arrayrefOfArrayType(o, arrayref)){
if (! (((ArrayType) arrayref).getElementType() instanceof ReferenceType)){
constraintViolated(o, "The 'arrayref' does not refer to an array with elements of a ReferenceType but to an array of "+((ArrayType) arrayref).getElementType()+".");
}
if (! ((ReferenceType)value).isAssignmentCompatibleWith((ReferenceType) ((ArrayType) arrayref).getElementType())){
constraintViolated(o, "The type of 'value' ('"+value+"') is not assignment compatible to the components of the array 'arrayref' refers to. ('"+((ArrayType) arrayref).getElementType()+"')");
}
}
} catch (ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e.toString());
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitACONST_NULL(ACONST_NULL o){
// Nothing needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitALOAD(ALOAD o){
//visitLoadInstruction(LoadInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitANEWARRAY(ANEWARRAY o){
if (!stack().peek().equals(Type.INT))
constraintViolated(o, "The 'count' at the stack top is not of type '"+Type.INT+"' but of type '"+stack().peek()+"'.");
// The runtime constant pool item at that index must be a symbolic reference to a class,
// array, or interface type. See Pass 3a.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitARETURN(ARETURN o){
if (! (stack().peek() instanceof ReferenceType) ){
constraintViolated(o, "The 'objectref' at the stack top is not of a ReferenceType but of type '"+stack().peek()+"'.");
}
ReferenceType objectref = (ReferenceType) (stack().peek());
referenceTypeIsInitialized(o, objectref);
// The check below should already done via visitReturnInstruction(ReturnInstruction), see there.
// It cannot be done using Staerk-et-al's "set of object types" instead of a
// "wider cast object type", anyway.
//if (! objectref.isAssignmentCompatibleWith(mg.getReturnType() )){
// constraintViolated(o, "The 'objectref' type "+objectref+" at the stack top is not assignment compatible with the return type '"+mg.getReturnType()+"' of the method.");
//}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitARRAYLENGTH(ARRAYLENGTH o){
Type arrayref = stack().peek(0);
arrayrefOfArrayType(o, arrayref);
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitASTORE(ASTORE o){
if (! ( (stack().peek() instanceof ReferenceType) || (stack().peek() instanceof ReturnaddressType) ) ){
constraintViolated(o, "The 'objectref' is not of a ReferenceType or of ReturnaddressType but of "+stack().peek()+".");
}
if (stack().peek() instanceof ReferenceType){
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek()) );
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitATHROW(ATHROW o){
try {
// It's stated that 'objectref' must be of a ReferenceType --- but since Throwable is
// not derived from an ArrayType, it follows that 'objectref' must be of an ObjectType or Type.NULL.
if (! ((stack().peek() instanceof ObjectType) || (stack().peek().equals(Type.NULL))) ){
constraintViolated(o, "The 'objectref' is not of an (initialized) ObjectType but of type "+stack().peek()+".");
}
// NULL is a subclass of every class, so to speak.
if (stack().peek().equals(Type.NULL)) return;
ObjectType exc = (ObjectType) (stack().peek());
ObjectType throwable = (ObjectType) (Type.getType("Ljava/lang/Throwable;"));
if ( (! (exc.subclassOf(throwable)) ) && (! (exc.equals(throwable))) ){
constraintViolated(o, "The 'objectref' is not of class Throwable or of a subclass of Throwable, but of '"+stack().peek()+"'.");
}
} catch (ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e.toString());
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitBALOAD(BALOAD o){
Type arrayref = stack().peek(1);
Type index = stack().peek(0);
indexOfInt(o, index);
if (arrayrefOfArrayType(o, arrayref)){
if (! ( (((ArrayType) arrayref).getElementType().equals(Type.BOOLEAN)) ||
(((ArrayType) arrayref).getElementType().equals(Type.BYTE)) ) ){
constraintViolated(o, "The 'arrayref' does not refer to an array with elements of a Type.BYTE or Type.BOOLEAN but to an array of '"+((ArrayType) arrayref).getElementType()+"'.");
}
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitBASTORE(BASTORE o){
Type arrayref = stack().peek(2);
Type index = stack().peek(1);
Type value = stack().peek(0);
indexOfInt(o, index);
valueOfInt(o, value);
if (arrayrefOfArrayType(o, arrayref)){
if (! ( (((ArrayType) arrayref).getElementType().equals(Type.BOOLEAN)) ||
(((ArrayType) arrayref).getElementType().equals(Type.BYTE)) ) )
constraintViolated(o, "The 'arrayref' does not refer to an array with elements of a Type.BYTE or Type.BOOLEAN but to an array of '"+((ArrayType) arrayref).getElementType()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitBIPUSH(BIPUSH o){
// Nothing to do...
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitBREAKPOINT(BREAKPOINT o){
throw new AssertionViolatedException("In this JustIce verification pass there should not occur an illegal instruction such as BREAKPOINT.");
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitCALOAD(CALOAD o){
Type arrayref = stack().peek(1);
Type index = stack().peek(0);
indexOfInt(o, index);
arrayrefOfArrayType(o, arrayref);
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitCASTORE(CASTORE o){
Type arrayref = stack().peek(2);
Type index = stack().peek(1);
Type value = stack().peek(0);
indexOfInt(o, index);
valueOfInt(o, value);
if (arrayrefOfArrayType(o, arrayref)){
if (! ((ArrayType) arrayref).getElementType().equals(Type.CHAR) ){
constraintViolated(o, "The 'arrayref' does not refer to an array with elements of type char but to an array of type "+((ArrayType) arrayref).getElementType()+".");
}
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitCHECKCAST(CHECKCAST o){
// The objectref must be of type reference.
Type objectref = stack().peek(0);
if (!(objectref instanceof ReferenceType)){
constraintViolated(o, "The 'objectref' is not of a ReferenceType but of type "+objectref+".");
}
else{
referenceTypeIsInitialized(o, (ReferenceType) objectref);
}
// The unsigned indexbyte1 and indexbyte2 are used to construct an index into the runtime constant pool of the
// current class (�3.6), where the value of the index is (indexbyte1 << 8) | indexbyte2. The runtime constant
// pool item at the index must be a symbolic reference to a class, array, or interface type.
Constant c = cpg.getConstant(o.getIndex());
if (! (c instanceof ConstantClass)){
constraintViolated(o, "The Constant at 'index' is not a ConstantClass, but '"+c+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitD2F(D2F o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitD2I(D2I o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitD2L(D2L o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDADD(DADD o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.DOUBLE){
constraintViolated(o, "The value at the stack next-to-top is not of type 'double', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDALOAD(DALOAD o){
indexOfInt(o, stack().peek());
if (stack().peek(1) == Type.NULL){
return;
}
if (! (stack().peek(1) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-top must be of type double[] but is '"+stack().peek(1)+"'.");
}
Type t = ((ArrayType) (stack().peek(1))).getBasicType();
if (t != Type.DOUBLE){
constraintViolated(o, "Stack next-to-top must be of type double[] but is '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDASTORE(DASTORE o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
indexOfInt(o, stack().peek(1));
if (stack().peek(2) == Type.NULL){
return;
}
if (! (stack().peek(2) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-next-to-top must be of type double[] but is '"+stack().peek(2)+"'.");
}
Type t = ((ArrayType) (stack().peek(2))).getBasicType();
if (t != Type.DOUBLE){
constraintViolated(o, "Stack next-to-next-to-top must be of type double[] but is '"+stack().peek(2)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDCMPG(DCMPG o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.DOUBLE){
constraintViolated(o, "The value at the stack next-to-top is not of type 'double', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDCMPL(DCMPL o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.DOUBLE){
constraintViolated(o, "The value at the stack next-to-top is not of type 'double', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDCONST(DCONST o){
// There's nothing to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDDIV(DDIV o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.DOUBLE){
constraintViolated(o, "The value at the stack next-to-top is not of type 'double', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDLOAD(DLOAD o){
//visitLoadInstruction(LoadInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDMUL(DMUL o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.DOUBLE){
constraintViolated(o, "The value at the stack next-to-top is not of type 'double', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDNEG(DNEG o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDREM(DREM o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.DOUBLE){
constraintViolated(o, "The value at the stack next-to-top is not of type 'double', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDRETURN(DRETURN o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDSTORE(DSTORE o){
//visitStoreInstruction(StoreInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDSUB(DSUB o){
if (stack().peek() != Type.DOUBLE){
constraintViolated(o, "The value at the stack top is not of type 'double', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.DOUBLE){
constraintViolated(o, "The value at the stack next-to-top is not of type 'double', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDUP(DUP o){
if (stack().peek().getSize() != 1){
constraintViolated(o, "Won't DUP type on stack top '"+stack().peek()+"' because it must occupy exactly one slot, not '"+stack().peek().getSize()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDUP_X1(DUP_X1 o){
if (stack().peek().getSize() != 1){
constraintViolated(o, "Type on stack top '"+stack().peek()+"' should occupy exactly one slot, not '"+stack().peek().getSize()+"'.");
}
if (stack().peek(1).getSize() != 1){
constraintViolated(o, "Type on stack next-to-top '"+stack().peek(1)+"' should occupy exactly one slot, not '"+stack().peek(1).getSize()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDUP_X2(DUP_X2 o){
if (stack().peek().getSize() != 1){
constraintViolated(o, "Stack top type must be of size 1, but is '"+stack().peek()+"' of size '"+stack().peek().getSize()+"'.");
}
if (stack().peek(1).getSize() == 2){
return; // Form 2, okay.
}
else{ //stack().peek(1).getSize == 1.
if (stack().peek(2).getSize() != 1){
constraintViolated(o, "If stack top's size is 1 and stack next-to-top's size is 1, stack next-to-next-to-top's size must also be 1, but is: '"+stack().peek(2)+"' of size '"+stack().peek(2).getSize()+"'.");
}
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDUP2(DUP2 o){
if (stack().peek().getSize() == 2){
return; // Form 2, okay.
}
else{ //stack().peek().getSize() == 1.
if (stack().peek(1).getSize() != 1){
constraintViolated(o, "If stack top's size is 1, then stack next-to-top's size must also be 1. But it is '"+stack().peek(1)+"' of size '"+stack().peek(1).getSize()+"'.");
}
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDUP2_X1(DUP2_X1 o){
if (stack().peek().getSize() == 2){
if (stack().peek(1).getSize() != 1){
constraintViolated(o, "If stack top's size is 2, then stack next-to-top's size must be 1. But it is '"+stack().peek(1)+"' of size '"+stack().peek(1).getSize()+"'.");
}
else{
return; // Form 2
}
}
else{ // stack top is of size 1
if ( stack().peek(1).getSize() != 1 ){
constraintViolated(o, "If stack top's size is 1, then stack next-to-top's size must also be 1. But it is '"+stack().peek(1)+"' of size '"+stack().peek(1).getSize()+"'.");
}
if ( stack().peek(2).getSize() != 1 ){
constraintViolated(o, "If stack top's size is 1, then stack next-to-next-to-top's size must also be 1. But it is '"+stack().peek(2)+"' of size '"+stack().peek(2).getSize()+"'.");
}
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitDUP2_X2(DUP2_X2 o){
if (stack().peek(0).getSize() == 2){
if (stack().peek(1).getSize() == 2){
return; // Form 4
}
else{// stack top size is 2, next-to-top's size is 1
if ( stack().peek(2).getSize() != 1 ){
constraintViolated(o, "If stack top's size is 2 and stack-next-to-top's size is 1, then stack next-to-next-to-top's size must also be 1. But it is '"+stack().peek(2)+"' of size '"+stack().peek(2).getSize()+"'.");
}
else{
return; // Form 2
}
}
}
else{// stack top is of size 1
if (stack().peek(1).getSize() == 1){
if ( stack().peek(2).getSize() == 2 ){
return; // Form 3
}
else{
if ( stack().peek(3).getSize() == 1){
return; // Form 1
}
}
}
}
constraintViolated(o, "The operand sizes on the stack do not match any of the four forms of usage of this instruction.");
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitF2D(F2D o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitF2I(F2I o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitF2L(F2L o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFADD(FADD o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.FLOAT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'float', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFALOAD(FALOAD o){
indexOfInt(o, stack().peek());
if (stack().peek(1) == Type.NULL){
return;
}
if (! (stack().peek(1) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-top must be of type float[] but is '"+stack().peek(1)+"'.");
}
Type t = ((ArrayType) (stack().peek(1))).getBasicType();
if (t != Type.FLOAT){
constraintViolated(o, "Stack next-to-top must be of type float[] but is '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFASTORE(FASTORE o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
indexOfInt(o, stack().peek(1));
if (stack().peek(2) == Type.NULL){
return;
}
if (! (stack().peek(2) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-next-to-top must be of type float[] but is '"+stack().peek(2)+"'.");
}
Type t = ((ArrayType) (stack().peek(2))).getBasicType();
if (t != Type.FLOAT){
constraintViolated(o, "Stack next-to-next-to-top must be of type float[] but is '"+stack().peek(2)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFCMPG(FCMPG o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.FLOAT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'float', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFCMPL(FCMPL o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.FLOAT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'float', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFCONST(FCONST o){
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFDIV(FDIV o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.FLOAT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'float', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFLOAD(FLOAD o){
//visitLoadInstruction(LoadInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFMUL(FMUL o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.FLOAT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'float', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFNEG(FNEG o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFREM(FREM o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.FLOAT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'float', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFRETURN(FRETURN o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFSTORE(FSTORE o){
//visitStoreInstruction(StoreInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitFSUB(FSUB o){
if (stack().peek() != Type.FLOAT){
constraintViolated(o, "The value at the stack top is not of type 'float', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.FLOAT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'float', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitGETFIELD(GETFIELD o){
try {
Type objectref = stack().peek();
if (! ( (objectref instanceof ObjectType) || (objectref == Type.NULL) ) ){
constraintViolated(o, "Stack top should be an object reference that's not an array reference, but is '"+objectref+"'.");
}
String field_name = o.getFieldName(cpg);
JavaClass jc = Repository.lookupClass(o.getClassType(cpg).getClassName());
Field[] fields = jc.getFields();
Field f = null;
for (int i=0; i<fields.length; i++){
if (fields[i].getName().equals(field_name)){
Type f_type = Type.getType(fields[i].getSignature());
Type o_type = o.getType(cpg);
/* TODO: Check if assignment compatibility is sufficient.
* What does Sun do?
*/
if (f_type.equals(o_type)){
f = fields[i];
break;
}
}
}
if (f == null){
throw new AssertionViolatedException("Field not found?!?");
}
if (f.isProtected()){
ObjectType classtype = o.getClassType(cpg);
ObjectType curr = new ObjectType(mg.getClassName());
if ( classtype.equals(curr) ||
curr.subclassOf(classtype) ){
Type t = stack().peek();
if (t == Type.NULL){
return;
}
if (! (t instanceof ObjectType) ){
constraintViolated(o, "The 'objectref' must refer to an object that's not an array. Found instead: '"+t+"'.");
}
ObjectType objreftype = (ObjectType) t;
if (! ( objreftype.equals(curr) ||
objreftype.subclassOf(curr) ) ){
//TODO: One day move to Staerk-et-al's "Set of object types" instead of "wider" object types
// created during the verification.
// "Wider" object types don't allow us to check for things like that below.
//constraintViolated(o, "The referenced field has the ACC_PROTECTED modifier, and it's a member of the current class or a superclass of the current class. However, the referenced object type '"+stack().peek()+"' is not the current class or a subclass of the current class.");
}
}
}
// TODO: Could go into Pass 3a.
if (f.isStatic()){
constraintViolated(o, "Referenced field '"+f+"' is static which it shouldn't be.");
}
} catch (ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e.toString());
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitGETSTATIC(GETSTATIC o){
// Field must be static: see Pass 3a.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitGOTO(GOTO o){
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitGOTO_W(GOTO_W o){
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitI2B(I2B o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitI2C(I2C o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitI2D(I2D o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitI2F(I2F o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitI2L(I2L o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitI2S(I2S o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIADD(IADD o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIALOAD(IALOAD o){
indexOfInt(o, stack().peek());
if (stack().peek(1) == Type.NULL){
return;
}
if (! (stack().peek(1) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-top must be of type int[] but is '"+stack().peek(1)+"'.");
}
Type t = ((ArrayType) (stack().peek(1))).getBasicType();
if (t != Type.INT){
constraintViolated(o, "Stack next-to-top must be of type int[] but is '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIAND(IAND o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIASTORE(IASTORE o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
indexOfInt(o, stack().peek(1));
if (stack().peek(2) == Type.NULL){
return;
}
if (! (stack().peek(2) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-next-to-top must be of type int[] but is '"+stack().peek(2)+"'.");
}
Type t = ((ArrayType) (stack().peek(2))).getBasicType();
if (t != Type.INT){
constraintViolated(o, "Stack next-to-next-to-top must be of type int[] but is '"+stack().peek(2)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitICONST(ICONST o){
//nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIDIV(IDIV o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIF_ACMPEQ(IF_ACMPEQ o){
if (!(stack().peek() instanceof ReferenceType)){
constraintViolated(o, "The value at the stack top is not of a ReferenceType, but of type '"+stack().peek()+"'.");
}
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek()) );
if (!(stack().peek(1) instanceof ReferenceType)){
constraintViolated(o, "The value at the stack next-to-top is not of a ReferenceType, but of type '"+stack().peek(1)+"'.");
}
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek(1)) );
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIF_ACMPNE(IF_ACMPNE o){
if (!(stack().peek() instanceof ReferenceType)){
constraintViolated(o, "The value at the stack top is not of a ReferenceType, but of type '"+stack().peek()+"'.");
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek()) );
}
if (!(stack().peek(1) instanceof ReferenceType)){
constraintViolated(o, "The value at the stack next-to-top is not of a ReferenceType, but of type '"+stack().peek(1)+"'.");
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek(1)) );
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIF_ICMPEQ(IF_ICMPEQ o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIF_ICMPGE(IF_ICMPGE o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIF_ICMPGT(IF_ICMPGT o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIF_ICMPLE(IF_ICMPLE o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIF_ICMPLT(IF_ICMPLT o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIF_ICMPNE(IF_ICMPNE o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIFEQ(IFEQ o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIFGE(IFGE o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIFGT(IFGT o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIFLE(IFLE o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIFLT(IFLT o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIFNE(IFNE o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIFNONNULL(IFNONNULL o){
if (!(stack().peek() instanceof ReferenceType)){
constraintViolated(o, "The value at the stack top is not of a ReferenceType, but of type '"+stack().peek()+"'.");
}
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek()) );
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIFNULL(IFNULL o){
if (!(stack().peek() instanceof ReferenceType)){
constraintViolated(o, "The value at the stack top is not of a ReferenceType, but of type '"+stack().peek()+"'.");
}
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek()) );
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIINC(IINC o){
// Mhhh. In BCEL, at this time "IINC" is not a LocalVariableInstruction.
if (locals().maxLocals() <= (o.getType(cpg).getSize()==1? o.getIndex() : o.getIndex()+1) ){
constraintViolated(o, "The 'index' is not a valid index into the local variable array.");
}
indexOfInt(o, locals().get(o.getIndex()));
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitILOAD(ILOAD o){
// All done by visitLocalVariableInstruction(), visitLoadInstruction()
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIMPDEP1(IMPDEP1 o){
throw new AssertionViolatedException("In this JustIce verification pass there should not occur an illegal instruction such as IMPDEP1.");
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIMPDEP2(IMPDEP2 o){
throw new AssertionViolatedException("In this JustIce verification pass there should not occur an illegal instruction such as IMPDEP2.");
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIMUL(IMUL o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitINEG(INEG o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitINSTANCEOF(INSTANCEOF o){
// The objectref must be of type reference.
Type objectref = stack().peek(0);
if (!(objectref instanceof ReferenceType)){
constraintViolated(o, "The 'objectref' is not of a ReferenceType but of type "+objectref+".");
}
else{
referenceTypeIsInitialized(o, (ReferenceType) objectref);
}
// The unsigned indexbyte1 and indexbyte2 are used to construct an index into the runtime constant pool of the
// current class (�3.6), where the value of the index is (indexbyte1 << 8) | indexbyte2. The runtime constant
// pool item at the index must be a symbolic reference to a class, array, or interface type.
Constant c = cpg.getConstant(o.getIndex());
if (! (c instanceof ConstantClass)){
constraintViolated(o, "The Constant at 'index' is not a ConstantClass, but '"+c+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitINVOKEINTERFACE(INVOKEINTERFACE o){
// Method is not native, otherwise pass 3 would not happen.
int count = o.getCount();
if (count == 0){
constraintViolated(o, "The 'count' argument must not be 0.");
}
// It is a ConstantInterfaceMethodref, Pass 3a made it sure.
// TODO: Do we want to do anything with it?
//ConstantInterfaceMethodref cimr = (ConstantInterfaceMethodref) (cpg.getConstant(o.getIndex()));
// the o.getClassType(cpg) type has passed pass 2; see visitLoadClass(o).
Type t = o.getType(cpg);
if (t instanceof ObjectType){
String name = ((ObjectType)t).getClassName();
Verifier v = VerifierFactory.getVerifier( name );
VerificationResult vr = v.doPass2();
if (vr.getStatus() != VerificationResult.VERIFIED_OK){
constraintViolated((Instruction) o, "Class '"+name+"' is referenced, but cannot be loaded and resolved: '"+vr+"'.");
}
}
Type[] argtypes = o.getArgumentTypes(cpg);
int nargs = argtypes.length;
for (int i=nargs-1; i>=0; i--){
Type fromStack = stack().peek( (nargs-1) - i ); // 0 to nargs-1
Type fromDesc = argtypes[i];
if (fromDesc == Type.BOOLEAN ||
fromDesc == Type.BYTE ||
fromDesc == Type.CHAR ||
fromDesc == Type.SHORT){
fromDesc = Type.INT;
}
if (! fromStack.equals(fromDesc)){
if (fromStack instanceof ReferenceType && fromDesc instanceof ReferenceType){
//ReferenceType rFromStack = (ReferenceType) fromStack;
//ReferenceType rFromDesc = (ReferenceType) fromDesc;
// TODO: This can only be checked when using Staerk-et-al's "set of object types"
// instead of a "wider cast object type" created during verification.
//if ( ! rFromStack.isAssignmentCompatibleWith(rFromDesc) ){
// constraintViolated(o, "Expecting a '"+fromDesc+"' but found a '"+fromStack+"' on the stack (which is not assignment compatible).");
//}
}
else{
constraintViolated(o, "Expecting a '"+fromDesc+"' but found a '"+fromStack+"' on the stack.");
}
}
}
Type objref = stack().peek(nargs);
if (objref == Type.NULL){
return;
}
if (! (objref instanceof ReferenceType) ){
constraintViolated(o, "Expecting a reference type as 'objectref' on the stack, not a '"+objref+"'.");
}
referenceTypeIsInitialized(o, (ReferenceType) objref);
if (!(objref instanceof ObjectType)){
if (!(objref instanceof ArrayType)){
constraintViolated(o, "Expecting an ObjectType as 'objectref' on the stack, not a '"+objref+"'."); // could be a ReturnaddressType
}
else{
objref = GENERIC_ARRAY;
}
}
// String objref_classname = ((ObjectType) objref).getClassName();
// String theInterface = o.getClassName(cpg);
// TODO: This can only be checked if we're using Staerk-et-al's "set of object types"
// instead of "wider cast object types" generated during verification.
//if ( ! Repository.implementationOf(objref_classname, theInterface) ){
// constraintViolated(o, "The 'objref' item '"+objref+"' does not implement '"+theInterface+"' as expected.");
//}
int counted_count = 1; // 1 for the objectref
for (int i=0; i<nargs; i++){
counted_count += argtypes[i].getSize();
}
if (count != counted_count){
constraintViolated(o, "The 'count' argument should probably read '"+counted_count+"' but is '"+count+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitINVOKESPECIAL(INVOKESPECIAL o){
try {
// Don't init an object twice.
if ( (o.getMethodName(cpg).equals(Constants.CONSTRUCTOR_NAME)) && (!(stack().peek(o.getArgumentTypes(cpg).length) instanceof UninitializedObjectType)) ){
constraintViolated(o, "Possibly initializing object twice. A valid instruction sequence must not have an uninitialized object on the operand stack or in a local variable during a backwards branch, or in a local variable in code protected by an exception handler. Please see The Java Virtual Machine Specification, Second Edition, 4.9.4 (pages 147 and 148) for details.");
}
// the o.getClassType(cpg) type has passed pass 2; see visitLoadClass(o).
Type t = o.getType(cpg);
if (t instanceof ObjectType){
String name = ((ObjectType)t).getClassName();
Verifier v = VerifierFactory.getVerifier( name );
VerificationResult vr = v.doPass2();
if (vr.getStatus() != VerificationResult.VERIFIED_OK){
constraintViolated((Instruction) o, "Class '"+name+"' is referenced, but cannot be loaded and resolved: '"+vr+"'.");
}
}
Type[] argtypes = o.getArgumentTypes(cpg);
int nargs = argtypes.length;
for (int i=nargs-1; i>=0; i--){
Type fromStack = stack().peek( (nargs-1) - i ); // 0 to nargs-1
Type fromDesc = argtypes[i];
if (fromDesc == Type.BOOLEAN ||
fromDesc == Type.BYTE ||
fromDesc == Type.CHAR ||
fromDesc == Type.SHORT){
fromDesc = Type.INT;
}
if (! fromStack.equals(fromDesc)){
if (fromStack instanceof ReferenceType && fromDesc instanceof ReferenceType){
ReferenceType rFromStack = (ReferenceType) fromStack;
ReferenceType rFromDesc = (ReferenceType) fromDesc;
// TODO: This can only be checked using Staerk-et-al's "set of object types", not
// using a "wider cast object type".
if ( ! rFromStack.isAssignmentCompatibleWith(rFromDesc) ){
constraintViolated(o, "Expecting a '"+fromDesc+"' but found a '"+fromStack+"' on the stack (which is not assignment compatible).");
}
}
else{
constraintViolated(o, "Expecting a '"+fromDesc+"' but found a '"+fromStack+"' on the stack.");
}
}
}
Type objref = stack().peek(nargs);
if (objref == Type.NULL){
return;
}
if (! (objref instanceof ReferenceType) ){
constraintViolated(o, "Expecting a reference type as 'objectref' on the stack, not a '"+objref+"'.");
}
String objref_classname = null;
if ( !(o.getMethodName(cpg).equals(Constants.CONSTRUCTOR_NAME))){
referenceTypeIsInitialized(o, (ReferenceType) objref);
if (!(objref instanceof ObjectType)){
if (!(objref instanceof ArrayType)){
constraintViolated(o, "Expecting an ObjectType as 'objectref' on the stack, not a '"+objref+"'."); // could be a ReturnaddressType
}
else{
objref = GENERIC_ARRAY;
}
}
objref_classname = ((ObjectType) objref).getClassName();
}
else{
if (!(objref instanceof UninitializedObjectType)){
constraintViolated(o, "Expecting an UninitializedObjectType as 'objectref' on the stack, not a '"+objref+"'. Otherwise, you couldn't invoke a method since an array has no methods (not to speak of a return address).");
}
objref_classname = ((UninitializedObjectType) objref).getInitialized().getClassName();
}
String theClass = o.getClassName(cpg);
if ( ! Repository.instanceOf(objref_classname, theClass) ){
constraintViolated(o, "The 'objref' item '"+objref+"' does not implement '"+theClass+"' as expected.");
}
} catch (ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e.toString());
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitINVOKESTATIC(INVOKESTATIC o){
try {
// Method is not native, otherwise pass 3 would not happen.
Type t = o.getType(cpg);
if (t instanceof ObjectType){
String name = ((ObjectType)t).getClassName();
Verifier v = VerifierFactory.getVerifier( name );
VerificationResult vr = v.doPass2();
if (vr.getStatus() != VerificationResult.VERIFIED_OK){
constraintViolated((Instruction) o, "Class '"+name+"' is referenced, but cannot be loaded and resolved: '"+vr+"'.");
}
}
Type[] argtypes = o.getArgumentTypes(cpg);
int nargs = argtypes.length;
for (int i=nargs-1; i>=0; i--){
Type fromStack = stack().peek( (nargs-1) - i ); // 0 to nargs-1
Type fromDesc = argtypes[i];
if (fromDesc == Type.BOOLEAN ||
fromDesc == Type.BYTE ||
fromDesc == Type.CHAR ||
fromDesc == Type.SHORT){
fromDesc = Type.INT;
}
if (! fromStack.equals(fromDesc)){
if (fromStack instanceof ReferenceType && fromDesc instanceof ReferenceType){
ReferenceType rFromStack = (ReferenceType) fromStack;
ReferenceType rFromDesc = (ReferenceType) fromDesc;
// TODO: This check can possibly only be done using Staerk-et-al's "set of object types"
// instead of a "wider cast object type" created during verification.
if ( ! rFromStack.isAssignmentCompatibleWith(rFromDesc) ){
constraintViolated(o, "Expecting a '"+fromDesc+"' but found a '"+fromStack+"' on the stack (which is not assignment compatible).");
}
}
else{
constraintViolated(o, "Expecting a '"+fromDesc+"' but found a '"+fromStack+"' on the stack.");
}
}
}
} catch (ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e.toString());
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitINVOKEVIRTUAL(INVOKEVIRTUAL o){
try {
// the o.getClassType(cpg) type has passed pass 2; see visitLoadClass(o).
Type t = o.getType(cpg);
if (t instanceof ObjectType){
String name = ((ObjectType)t).getClassName();
Verifier v = VerifierFactory.getVerifier( name );
VerificationResult vr = v.doPass2();
if (vr.getStatus() != VerificationResult.VERIFIED_OK){
constraintViolated((Instruction) o, "Class '"+name+"' is referenced, but cannot be loaded and resolved: '"+vr+"'.");
}
}
Type[] argtypes = o.getArgumentTypes(cpg);
int nargs = argtypes.length;
for (int i=nargs-1; i>=0; i--){
Type fromStack = stack().peek( (nargs-1) - i ); // 0 to nargs-1
Type fromDesc = argtypes[i];
if (fromDesc == Type.BOOLEAN ||
fromDesc == Type.BYTE ||
fromDesc == Type.CHAR ||
fromDesc == Type.SHORT){
fromDesc = Type.INT;
}
if (! fromStack.equals(fromDesc)){
if (fromStack instanceof ReferenceType && fromDesc instanceof ReferenceType){
ReferenceType rFromStack = (ReferenceType) fromStack;
ReferenceType rFromDesc = (ReferenceType) fromDesc;
// TODO: This can possibly only be checked when using Staerk-et-al's "set of object types" instead
// of a single "wider cast object type" created during verification.
if ( ! rFromStack.isAssignmentCompatibleWith(rFromDesc) ){
constraintViolated(o, "Expecting a '"+fromDesc+"' but found a '"+fromStack+"' on the stack (which is not assignment compatible).");
}
}
else{
constraintViolated(o, "Expecting a '"+fromDesc+"' but found a '"+fromStack+"' on the stack.");
}
}
}
Type objref = stack().peek(nargs);
if (objref == Type.NULL){
return;
}
if (! (objref instanceof ReferenceType) ){
constraintViolated(o, "Expecting a reference type as 'objectref' on the stack, not a '"+objref+"'.");
}
referenceTypeIsInitialized(o, (ReferenceType) objref);
if (!(objref instanceof ObjectType)){
if (!(objref instanceof ArrayType)){
constraintViolated(o, "Expecting an ObjectType as 'objectref' on the stack, not a '"+objref+"'."); // could be a ReturnaddressType
}
else{
objref = GENERIC_ARRAY;
}
}
String objref_classname = ((ObjectType) objref).getClassName();
String theClass = o.getClassName(cpg);
if ( ! Repository.instanceOf(objref_classname, theClass) ){
constraintViolated(o, "The 'objref' item '"+objref+"' does not implement '"+theClass+"' as expected.");
}
} catch (ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e.toString());
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIOR(IOR o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIREM(IREM o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIRETURN(IRETURN o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitISHL(ISHL o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitISHR(ISHR o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitISTORE(ISTORE o){
//visitStoreInstruction(StoreInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitISUB(ISUB o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIUSHR(IUSHR o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitIXOR(IXOR o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.INT){
constraintViolated(o, "The value at the stack next-to-top is not of type 'int', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitJSR(JSR o){
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitJSR_W(JSR_W o){
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitL2D(L2D o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitL2F(L2F o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitL2I(L2I o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLADD(LADD o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLALOAD(LALOAD o){
indexOfInt(o, stack().peek());
if (stack().peek(1) == Type.NULL){
return;
}
if (! (stack().peek(1) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-top must be of type long[] but is '"+stack().peek(1)+"'.");
}
Type t = ((ArrayType) (stack().peek(1))).getBasicType();
if (t != Type.LONG){
constraintViolated(o, "Stack next-to-top must be of type long[] but is '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLAND(LAND o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLASTORE(LASTORE o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
indexOfInt(o, stack().peek(1));
if (stack().peek(2) == Type.NULL){
return;
}
if (! (stack().peek(2) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-next-to-top must be of type long[] but is '"+stack().peek(2)+"'.");
}
Type t = ((ArrayType) (stack().peek(2))).getBasicType();
if (t != Type.LONG){
constraintViolated(o, "Stack next-to-next-to-top must be of type long[] but is '"+stack().peek(2)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLCMP(LCMP o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLCONST(LCONST o){
// Nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLDC(LDC o){
// visitCPInstruction is called first.
Constant c = cpg.getConstant(o.getIndex());
if (! ( ( c instanceof ConstantInteger) ||
( c instanceof ConstantFloat ) ||
( c instanceof ConstantString ) ) ){
constraintViolated(o, "Referenced constant should be a CONSTANT_Integer, a CONSTANT_Float or a CONSTANT_String, but is '"+c+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLDC_W(LDC_W o){
// visitCPInstruction is called first.
Constant c = cpg.getConstant(o.getIndex());
if (! ( ( c instanceof ConstantInteger) ||
( c instanceof ConstantFloat ) ||
( c instanceof ConstantString ) ) ){
constraintViolated(o, "Referenced constant should be a CONSTANT_Integer, a CONSTANT_Float or a CONSTANT_String, but is '"+c+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLDC2_W(LDC2_W o){
// visitCPInstruction is called first.
Constant c = cpg.getConstant(o.getIndex());
if (! ( ( c instanceof ConstantLong) ||
( c instanceof ConstantDouble ) ) ){
constraintViolated(o, "Referenced constant should be a CONSTANT_Integer, a CONSTANT_Float or a CONSTANT_String, but is '"+c+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLDIV(LDIV o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLLOAD(LLOAD o){
//visitLoadInstruction(LoadInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLMUL(LMUL o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLNEG(LNEG o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLOOKUPSWITCH(LOOKUPSWITCH o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
// See also pass 3a.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLOR(LOR o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLREM(LREM o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLRETURN(LRETURN o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLSHL(LSHL o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLSHR(LSHR o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLSTORE(LSTORE o){
//visitStoreInstruction(StoreInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLSUB(LSUB o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLUSHR(LUSHR o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLXOR(LXOR o){
if (stack().peek() != Type.LONG){
constraintViolated(o, "The value at the stack top is not of type 'long', but of type '"+stack().peek()+"'.");
}
if (stack().peek(1) != Type.LONG){
constraintViolated(o, "The value at the stack next-to-top is not of type 'long', but of type '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitMONITORENTER(MONITORENTER o){
if (! ((stack().peek()) instanceof ReferenceType)){
constraintViolated(o, "The stack top should be of a ReferenceType, but is '"+stack().peek()+"'.");
}
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek()) );
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitMONITOREXIT(MONITOREXIT o){
if (! ((stack().peek()) instanceof ReferenceType)){
constraintViolated(o, "The stack top should be of a ReferenceType, but is '"+stack().peek()+"'.");
}
referenceTypeIsInitialized(o, (ReferenceType) (stack().peek()) );
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitMULTIANEWARRAY(MULTIANEWARRAY o){
int dimensions = o.getDimensions();
// Dimensions argument is okay: see Pass 3a.
for (int i=0; i<dimensions; i++){
if (stack().peek(i) != Type.INT){
constraintViolated(o, "The '"+dimensions+"' upper stack types should be 'int' but aren't.");
}
}
// The runtime constant pool item at that index must be a symbolic reference to a class,
// array, or interface type. See Pass 3a.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitNEW(NEW o){
//visitCPInstruction(CPInstruction) has been called before.
//visitLoadClass(LoadClass) has been called before.
Type t = o.getType(cpg);
if (! (t instanceof ReferenceType)){
throw new AssertionViolatedException("NEW.getType() returning a non-reference type?!");
}
if (! (t instanceof ObjectType)){
constraintViolated(o, "Expecting a class type (ObjectType) to work on. Found: '"+t+"'.");
}
ObjectType obj = (ObjectType) t;
//e.g.: Don't instantiate interfaces
if (! obj.referencesClass()){
constraintViolated(o, "Expecting a class type (ObjectType) to work on. Found: '"+obj+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitNEWARRAY(NEWARRAY o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitNOP(NOP o){
// nothing is to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitPOP(POP o){
if (stack().peek().getSize() != 1){
constraintViolated(o, "Stack top size should be 1 but stack top is '"+stack().peek()+"' of size '"+stack().peek().getSize()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitPOP2(POP2 o){
if (stack().peek().getSize() != 2){
constraintViolated(o, "Stack top size should be 2 but stack top is '"+stack().peek()+"' of size '"+stack().peek().getSize()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitPUTFIELD(PUTFIELD o){
try {
Type objectref = stack().peek(1);
if (! ( (objectref instanceof ObjectType) || (objectref == Type.NULL) ) ){
constraintViolated(o, "Stack next-to-top should be an object reference that's not an array reference, but is '"+objectref+"'.");
}
String field_name = o.getFieldName(cpg);
JavaClass jc = Repository.lookupClass(o.getClassType(cpg).getClassName());
Field[] fields = jc.getFields();
Field f = null;
for (int i=0; i<fields.length; i++){
if (fields[i].getName().equals(field_name)){
Type f_type = Type.getType(fields[i].getSignature());
Type o_type = o.getType(cpg);
/* TODO: Check if assignment compatibility is sufficient.
* What does Sun do?
*/
if (f_type.equals(o_type)){
f = fields[i];
break;
}
}
}
if (f == null){
throw new AssertionViolatedException("Field not found?!?");
}
Type value = stack().peek();
Type t = Type.getType(f.getSignature());
Type shouldbe = t;
if (shouldbe == Type.BOOLEAN ||
shouldbe == Type.BYTE ||
shouldbe == Type.CHAR ||
shouldbe == Type.SHORT){
shouldbe = Type.INT;
}
if (t instanceof ReferenceType){
ReferenceType rvalue = null;
if (value instanceof ReferenceType){
rvalue = (ReferenceType) value;
referenceTypeIsInitialized(o, rvalue);
}
else{
constraintViolated(o, "The stack top type '"+value+"' is not of a reference type as expected.");
}
// TODO: This can possibly only be checked using Staerk-et-al's "set-of-object types", not
// using "wider cast object types" created during verification.
// Comment it out if you encounter problems. See also the analogon at visitPUTSTATIC.
if (!(rvalue.isAssignmentCompatibleWith(shouldbe))){
constraintViolated(o, "The stack top type '"+value+"' is not assignment compatible with '"+shouldbe+"'.");
}
}
else{
if (shouldbe != value){
constraintViolated(o, "The stack top type '"+value+"' is not of type '"+shouldbe+"' as expected.");
}
}
if (f.isProtected()){
ObjectType classtype = o.getClassType(cpg);
ObjectType curr = new ObjectType(mg.getClassName());
if ( classtype.equals(curr) ||
curr.subclassOf(classtype) ){
Type tp = stack().peek(1);
if (tp == Type.NULL){
return;
}
if (! (tp instanceof ObjectType) ){
constraintViolated(o, "The 'objectref' must refer to an object that's not an array. Found instead: '"+tp+"'.");
}
ObjectType objreftype = (ObjectType) tp;
if (! ( objreftype.equals(curr) ||
objreftype.subclassOf(curr) ) ){
constraintViolated(o, "The referenced field has the ACC_PROTECTED modifier, and it's a member of the current class or a superclass of the current class. However, the referenced object type '"+stack().peek()+"' is not the current class or a subclass of the current class.");
}
}
}
// TODO: Could go into Pass 3a.
if (f.isStatic()){
constraintViolated(o, "Referenced field '"+f+"' is static which it shouldn't be.");
}
} catch (ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e.toString());
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitPUTSTATIC(PUTSTATIC o){
try {
String field_name = o.getFieldName(cpg);
JavaClass jc = Repository.lookupClass(o.getClassType(cpg).getClassName());
Field[] fields = jc.getFields();
Field f = null;
for (int i=0; i<fields.length; i++){
if (fields[i].getName().equals(field_name)){
Type f_type = Type.getType(fields[i].getSignature());
Type o_type = o.getType(cpg);
/* TODO: Check if assignment compatibility is sufficient.
* What does Sun do?
*/
if (f_type.equals(o_type)){
f = fields[i];
break;
}
}
}
if (f == null){
throw new AssertionViolatedException("Field not found?!?");
}
Type value = stack().peek();
Type t = Type.getType(f.getSignature());
Type shouldbe = t;
if (shouldbe == Type.BOOLEAN ||
shouldbe == Type.BYTE ||
shouldbe == Type.CHAR ||
shouldbe == Type.SHORT){
shouldbe = Type.INT;
}
if (t instanceof ReferenceType){
ReferenceType rvalue = null;
if (value instanceof ReferenceType){
rvalue = (ReferenceType) value;
referenceTypeIsInitialized(o, rvalue);
}
else{
constraintViolated(o, "The stack top type '"+value+"' is not of a reference type as expected.");
}
// TODO: This can possibly only be checked using Staerk-et-al's "set-of-object types", not
// using "wider cast object types" created during verification.
// Comment it out if you encounter problems. See also the analogon at visitPUTFIELD.
if (!(rvalue.isAssignmentCompatibleWith(shouldbe))){
constraintViolated(o, "The stack top type '"+value+"' is not assignment compatible with '"+shouldbe+"'.");
}
}
else{
if (shouldbe != value){
constraintViolated(o, "The stack top type '"+value+"' is not of type '"+shouldbe+"' as expected.");
}
}
// TODO: Interface fields may be assigned to only once. (Hard to implement in
// JustIce's execution model). This may only happen in <clinit>, see Pass 3a.
} catch (ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e.toString());
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitRET(RET o){
if (! (locals().get(o.getIndex()) instanceof ReturnaddressType)){
constraintViolated(o, "Expecting a ReturnaddressType in local variable "+o.getIndex()+".");
}
if (locals().get(o.getIndex()) == ReturnaddressType.NO_TARGET){
throw new AssertionViolatedException("Oops: RET expecting a target!");
}
// Other constraints such as non-allowed overlapping subroutines are enforced
// while building the Subroutines data structure.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitRETURN(RETURN o){
if (mg.getName().equals(Constants.CONSTRUCTOR_NAME)){// If we leave an <init> method
if ((Frame._this != null) && (!(mg.getClassName().equals(Type.OBJECT.getClassName()))) ) {
constraintViolated(o, "Leaving a constructor that itself did not call a constructor.");
}
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitSALOAD(SALOAD o){
indexOfInt(o, stack().peek());
if (stack().peek(1) == Type.NULL){
return;
}
if (! (stack().peek(1) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-top must be of type short[] but is '"+stack().peek(1)+"'.");
}
Type t = ((ArrayType) (stack().peek(1))).getBasicType();
if (t != Type.SHORT){
constraintViolated(o, "Stack next-to-top must be of type short[] but is '"+stack().peek(1)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitSASTORE(SASTORE o){
if (stack().peek() != Type.INT){
constraintViolated(o, "The value at the stack top is not of type 'int', but of type '"+stack().peek()+"'.");
}
indexOfInt(o, stack().peek(1));
if (stack().peek(2) == Type.NULL){
return;
}
if (! (stack().peek(2) instanceof ArrayType)){
constraintViolated(o, "Stack next-to-next-to-top must be of type short[] but is '"+stack().peek(2)+"'.");
}
Type t = ((ArrayType) (stack().peek(2))).getBasicType();
if (t != Type.SHORT){
constraintViolated(o, "Stack next-to-next-to-top must be of type short[] but is '"+stack().peek(2)+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitSIPUSH(SIPUSH o){
// nothing to do here. Generic visitXXX() methods did the trick before.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitSWAP(SWAP o){
if (stack().peek().getSize() != 1){
constraintViolated(o, "The value at the stack top is not of size '1', but of size '"+stack().peek().getSize()+"'.");
}
if (stack().peek(1).getSize() != 1){
constraintViolated(o, "The value at the stack next-to-top is not of size '1', but of size '"+stack().peek(1).getSize()+"'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitTABLESWITCH(TABLESWITCH o){
indexOfInt(o, stack().peek());
// See Pass 3a.
}
}