Apache BCEL Source Code Files
Apache BCEL Source Code Files are inside the Apache BCEL source package file
like bcel-6.6.1-src.zip.
Unzip the source package file and go to the "src/main" sub-directory,
you will see source code files.
Here is the list of Java source code files of the Apache BCEL 6.6.1 in \Users\fyicenter\bcel-6.6.1\src:
✍: FYIcenter
⏎ org/apache/bcel/verifier/structurals/InstConstraintVisitor.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.Const;
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;
//CHECKSTYLE:OFF (there are lots of references!)
import org.apache.bcel.generic.*;
//CHECKSTYLE:ON
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 behavior concerning monitors (MONITORENTER, MONITOREXIT) is not modeled in
* JustIce.
*
* @see StructuralCodeConstraintException
*/
public class InstConstraintVisitor extends EmptyVisitor {
private static final ObjectType GENERIC_ARRAY = ObjectType.getInstance(GenericArray.class.getName());
/**
* The Execution Frame we're working on.
*
* @see #setFrame(Frame f)
* @see #locals()
* @see #stack()
*/
private Frame frame;
/**
* The ConstantPoolGen we're working on.
*
* @see #setConstantPoolGen(ConstantPoolGen cpg)
*/
private ConstantPoolGen cpg;
/**
* The MethodGen we're working on.
*
* @see #setMethodGen(MethodGen mg)
*/
private MethodGen mg;
/**
* The constructor. Constructs a new instance of this class.
*/
public InstConstraintVisitor() {
}
/***************************************************************/
/* 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(final Instruction o) {
final int consume = o.consumeStack(cpg); // Stack values are always consumed first; then produced.
if (consume > stack().slotsUsed()) {
constraintViolated(o, "Cannot consume " + consume + " stack slots: only " + stack().slotsUsed() + " slot(s) left on stack!\nStack:\n" + stack());
}
final int produce = o.produceStack(cpg) - o.consumeStack(cpg); // Stack values are always consumed first; then produced.
if (produce + stack().slotsUsed() > stack().maxStack()) {
constraintViolated(o, "Cannot produce " + produce + " stack slots: only " + (stack().maxStack() - stack().slotsUsed())
+ " free stack slot(s) left.\nStack:\n" + stack());
}
}
/**
* Assures arrayref is of ArrayType or NULL; returns true if and only if arrayref is non-NULL.
*
* @throws StructuralCodeConstraintException if the above constraint is violated.
*/
private boolean arrayrefOfArrayType(final Instruction o, final 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;
}
/**
* This method is called by the visitXXX() to notify the acceptor of this InstConstraintVisitor that a constraint
* violation has occurred. This is done by throwing an instance of a StructuralCodeConstraintException.
*
* @throws StructuralCodeConstraintException always.
*/
private void constraintViolated(final Instruction violator, final String description) {
final String fqClassName = violator.getClass().getName();
throw new StructuralCodeConstraintException(
"Instruction " + fqClassName.substring(fqClassName.lastIndexOf('.') + 1) + " constraint violated: " + description);
}
private ObjectType getObjectType(final FieldInstruction o) {
final ReferenceType rt = o.getReferenceType(cpg);
if (rt instanceof ObjectType) {
return (ObjectType) rt;
}
constraintViolated(o, "expecting ObjectType but got " + rt);
return null;
}
/**
* Assures index is of type INT.
*
* @throws StructuralCodeConstraintException if the above constraint is not satisfied.
*/
private void indexOfInt(final Instruction o, final Type index) {
if (!index.equals(Type.INT)) {
constraintViolated(o, "The 'index' is not of type int but of type " + index + ".");
}
}
/**
* The LocalVariables we're working on.
*
* @see #setFrame(Frame f)
*/
private LocalVariables locals() {
return frame.getLocals();
}
/**
* Assures the ReferenceType r is initialized (or Type.NULL). Formally, this means (!(r instanceof
* UninitializedObjectType)), because there are no uninitialized array types.
*
* @throws StructuralCodeConstraintException if the above constraint is not satisfied.
*/
private void referenceTypeIsInitialized(final Instruction o, final ReferenceType r) {
if (r instanceof UninitializedObjectType) {
constraintViolated(o, "Working on an uninitialized object '" + r + "'.");
}
}
/**
* Sets the ConstantPoolGen instance needed for constraint checking prior to execution.
*/
public void setConstantPoolGen(final ConstantPoolGen cpg) { // TODO could be package-protected?
this.cpg = cpg;
}
/**
* 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(final Frame f) { // TODO could be package-protected?
this.frame = f;
// if (singleInstance.mg == null || singleInstance.cpg == null)
// throw new AssertionViolatedException("Forgot to set important values first.");
}
/**
* Sets the MethodGen instance needed for constraint checking prior to execution.
*/
public void setMethodGen(final MethodGen mg) {
this.mg = mg;
}
/**
* The OperandStack we're working on.
*
* @see #setFrame(Frame f)
*/
private OperandStack stack() {
return frame.getStack();
}
/***************************************************************/
/* "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 value is of type INT. */
private void valueOfInt(final Instruction o, final Type value) {
if (!value.equals(Type.INT)) {
constraintViolated(o, "The 'value' is not of type int but of type " + value + ".");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitAALOAD(final AALOAD o) {
final Type arrayref = stack().peek(1);
final Type index = stack().peek(0);
indexOfInt(o, index);
if (arrayrefOfArrayType(o, arrayref) && !(((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.
*/
@Override
public void visitAASTORE(final AASTORE o) {
final Type arrayref = stack().peek(2);
final Type index = stack().peek(1);
final 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) && !(((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() + ".");
}
// No check for array element assignment compatibility. This is done at runtime.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitACONST_NULL(final ACONST_NULL o) {
// Nothing needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitALOAD(final ALOAD o) {
// visitLoadInstruction(LoadInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitANEWARRAY(final 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.
*/
@Override
public void visitARETURN(final 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() + "'.");
}
final 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.
*/
@Override
public void visitARRAYLENGTH(final ARRAYLENGTH o) {
final Type arrayref = stack().peek(0);
arrayrefOfArrayType(o, arrayref);
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitASTORE(final 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.
*/
@Override
public void visitATHROW(final 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;
}
final ObjectType exc = (ObjectType) stack().peek();
final 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 (final ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e, e);
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitBALOAD(final BALOAD o) {
final Type arrayref = stack().peek(1);
final Type index = stack().peek(0);
indexOfInt(o, index);
if (arrayrefOfArrayType(o, arrayref)
&& !(((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() + "'.");
}
}
/***************************************************************/
/* "special"visitXXXX methods for one type of instruction each */
/***************************************************************/
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitBASTORE(final BASTORE o) {
final Type arrayref = stack().peek(2);
final Type index = stack().peek(1);
final Type value = stack().peek(0);
indexOfInt(o, index);
valueOfInt(o, value);
if (arrayrefOfArrayType(o, arrayref)
&& !(((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.
*/
@Override
public void visitBIPUSH(final BIPUSH o) {
// Nothing to do...
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitBREAKPOINT(final 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.
*/
@Override
public void visitCALOAD(final CALOAD o) {
final Type arrayref = stack().peek(1);
final Type index = stack().peek(0);
indexOfInt(o, index);
arrayrefOfArrayType(o, arrayref);
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitCASTORE(final CASTORE o) {
final Type arrayref = stack().peek(2);
final Type index = stack().peek(1);
final Type value = stack().peek(0);
indexOfInt(o, index);
valueOfInt(o, value);
if (arrayrefOfArrayType(o, arrayref) && !((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.
*/
@Override
public void visitCHECKCAST(final CHECKCAST o) {
// The objectref must be of type reference.
final 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.
final Constant c = cpg.getConstant(o.getIndex());
if (!(c instanceof ConstantClass)) {
constraintViolated(o, "The Constant at 'index' is not a ConstantClass, but '" + c + "'.");
}
}
/***************************************************************/
/* "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.
*/
@Override
public void visitCPInstruction(final CPInstruction o) {
final 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 specific preconditions of the said instruction.
*/
@Override
public void visitD2F(final 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.
*/
@Override
public void visitD2I(final 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.
*/
@Override
public void visitD2L(final 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.
*/
@Override
public void visitDADD(final 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.
*/
@Override
public void visitDALOAD(final 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) + "'.");
}
final 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.
*/
@Override
public void visitDASTORE(final 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) + "'.");
}
final 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.
*/
@Override
public void visitDCMPG(final 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.
*/
@Override
public void visitDCMPL(final 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.
*/
@Override
public void visitDCONST(final DCONST o) {
// There's nothing to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitDDIV(final 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.
*/
@Override
public void visitDLOAD(final DLOAD o) {
// visitLoadInstruction(LoadInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitDMUL(final 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.
*/
@Override
public void visitDNEG(final 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.
*/
@Override
public void visitDREM(final 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.
*/
@Override
public void visitDRETURN(final 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.
*/
@Override
public void visitDSTORE(final DSTORE o) {
// visitStoreInstruction(StoreInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitDSUB(final 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.
*/
@Override
public void visitDUP(final 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.
*/
@Override
public void visitDUP_X1(final 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.
*/
@Override
public void visitDUP_X2(final 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.
}
// 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.
*/
@Override
public void visitDUP2(final DUP2 o) {
if (stack().peek().getSize() == 2) {
return; // Form 2, okay.
}
// 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.
*/
@Override
public void visitDUP2_X1(final 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 { // 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.
*/
@Override
public void visitDUP2_X2(final DUP2_X2 o) {
if (stack().peek(0).getSize() == 2) {
// stack top size is 2, next-to-top's size is 1
if (stack().peek(1).getSize() == 2 || stack().peek(2).getSize() == 1) {
return; // Form 2
}
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 if (stack().peek(1).getSize() == 1 && (stack().peek(2).getSize() == 2 || 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.
*/
@Override
public void visitF2D(final 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.
*/
@Override
public void visitF2I(final 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.
*/
@Override
public void visitF2L(final 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.
*/
@Override
public void visitFADD(final 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.
*/
@Override
public void visitFALOAD(final 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) + "'.");
}
final 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.
*/
@Override
public void visitFASTORE(final 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) + "'.");
}
final 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.
*/
@Override
public void visitFCMPG(final 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.
*/
@Override
public void visitFCMPL(final 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.
*/
@Override
public void visitFCONST(final FCONST o) {
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitFDIV(final 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 general preconditions of a FieldInstruction instance.
*/
@Override
public void visitFieldInstruction(final 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
final 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).
final Type t = o.getType(cpg);
if (t instanceof ObjectType) {
final String name = ((ObjectType) t).getClassName();
final Verifier v = VerifierFactory.getVerifier(name);
final VerificationResult vr = v.doPass2();
if (vr.getStatus() != VerificationResult.VERIFIED_OK) {
constraintViolated(o, "Class '" + name + "' is referenced, but cannot be loaded and resolved: '" + vr + "'.");
}
}
}
private Field visitFieldInstructionInternals(final FieldInstruction o) throws ClassNotFoundException {
final String fieldName = o.getFieldName(cpg);
final JavaClass jc = Repository.lookupClass(getObjectType(o).getClassName());
final Field[] fields = jc.getFields();
Field f = null;
for (final Field field : fields) {
if (field.getName().equals(fieldName)) {
final Type fType = Type.getType(field.getSignature());
final Type oType = o.getType(cpg);
/*
* TODO: Check if assignment compatibility is sufficient. What does Sun do?
*/
if (fType.equals(oType)) {
f = field;
break;
}
}
}
if (f == null) {
throw new AssertionViolatedException("Field '" + fieldName + "' not found in " + jc.getClassName());
}
final Type value = stack().peek();
final 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|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.");
}
return f;
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitFLOAD(final FLOAD o) {
// visitLoadInstruction(LoadInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitFMUL(final 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.
*/
@Override
public void visitFNEG(final 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.
*/
@Override
public void visitFREM(final 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.
*/
@Override
public void visitFRETURN(final 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.
*/
@Override
public void visitFSTORE(final FSTORE o) {
// visitStoreInstruction(StoreInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitFSUB(final 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.
*/
@Override
public void visitGETFIELD(final GETFIELD o) {
try {
final 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 + "'.");
}
final String fieldName = o.getFieldName(cpg);
final JavaClass jc = Repository.lookupClass(getObjectType(o).getClassName());
Field[] fields = jc.getFields();
Field f = null;
for (final Field field : fields) {
if (field.getName().equals(fieldName)) {
final Type fType = Type.getType(field.getSignature());
final Type oType = o.getType(cpg);
/*
* TODO: Check if assignment compatibility is sufficient. What does Sun do?
*/
if (fType.equals(oType)) {
f = field;
break;
}
}
}
if (f == null) {
final JavaClass[] superclasses = jc.getSuperClasses();
outer: for (final JavaClass superclass : superclasses) {
fields = superclass.getFields();
for (final Field field : fields) {
if (field.getName().equals(fieldName)) {
final Type fType = Type.getType(field.getSignature());
final Type oType = o.getType(cpg);
if (fType.equals(oType)) {
f = field;
if ((f.getAccessFlags() & (Const.ACC_PUBLIC | Const.ACC_PROTECTED)) == 0) {
f = null;
}
break outer;
}
}
}
}
if (f == null) {
throw new AssertionViolatedException("Field '" + fieldName + "' not found in " + jc.getClassName());
}
}
if (f.isProtected()) {
final ObjectType classtype = getObjectType(o);
final ObjectType curr = ObjectType.getInstance(mg.getClassName());
if (classtype.equals(curr) || curr.subclassOf(classtype)) {
final 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 + "'.");
}
// final 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 (final ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e, e);
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitGETSTATIC(final GETSTATIC o) {
// Field must be static: see Pass 3a.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitGOTO(final GOTO o) {
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitGOTO_W(final GOTO_W o) {
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitI2B(final 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.
*/
@Override
public void visitI2C(final 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.
*/
@Override
public void visitI2D(final 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.
*/
@Override
public void visitI2F(final 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.
*/
@Override
public void visitI2L(final 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.
*/
@Override
public void visitI2S(final 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.
*/
@Override
public void visitIADD(final 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.
*/
@Override
public void visitIALOAD(final 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) + "'.");
}
final 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.
*/
@Override
public void visitIAND(final 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.
*/
@Override
public void visitIASTORE(final 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) + "'.");
}
final 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.
*/
@Override
public void visitICONST(final ICONST o) {
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitIDIV(final 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.
*/
@Override
public void visitIF_ACMPEQ(final 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.
*/
@Override
public void visitIF_ACMPNE(final 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.
*/
@Override
public void visitIF_ICMPEQ(final 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.
*/
@Override
public void visitIF_ICMPGE(final 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.
*/
@Override
public void visitIF_ICMPGT(final 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.
*/
@Override
public void visitIF_ICMPLE(final 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.
*/
@Override
public void visitIF_ICMPLT(final 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.
*/
@Override
public void visitIF_ICMPNE(final 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.
*/
@Override
public void visitIFEQ(final 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.
*/
@Override
public void visitIFGE(final 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.
*/
@Override
public void visitIFGT(final 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.
*/
@Override
public void visitIFLE(final 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.
*/
@Override
public void visitIFLT(final 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.
*/
@Override
public void visitIFNE(final 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.
*/
@Override
public void visitIFNONNULL(final 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.
*/
@Override
public void visitIFNULL(final 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.
*/
@Override
public void visitIINC(final 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.
*/
@Override
public void visitILOAD(final ILOAD o) {
// All done by visitLocalVariableInstruction(), visitLoadInstruction()
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitIMPDEP1(final 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.
*/
@Override
public void visitIMPDEP2(final 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.
*/
@Override
public void visitIMUL(final 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.
*/
@Override
public void visitINEG(final 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.
*/
@Override
public void visitINSTANCEOF(final INSTANCEOF o) {
// The objectref must be of type reference.
final 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.
final 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.
*
* @since 6.0
*/
@Override
public void visitINVOKEDYNAMIC(final INVOKEDYNAMIC o) {
throw new UnsupportedOperationException("INVOKEDYNAMIC instruction is not supported at this time");
}
/**
* Ensures the general preconditions of an InvokeInstruction instance.
*/
@Override
public void visitInvokeInstruction(final InvokeInstruction o) {
// visitLoadClass(o) has been called before: Every FieldOrMethod
// implements LoadClass.
// visitCPInstruction(o) has been called before.
// TODO
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitINVOKEINTERFACE(final INVOKEINTERFACE o) {
// Method is not native, otherwise pass 3 would not happen.
final 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).
final Type t = o.getType(cpg);
if (t instanceof ObjectType) {
final String name = ((ObjectType) t).getClassName();
final Verifier v = VerifierFactory.getVerifier(name);
final VerificationResult vr = v.doPass2();
if (vr.getStatus() != VerificationResult.VERIFIED_OK) {
constraintViolated(o, "Class '" + name + "' is referenced, but cannot be loaded and resolved: '" + vr + "'.");
}
}
final Type[] argtypes = o.getArgumentTypes(cpg);
final int nargs = argtypes.length;
for (int i = nargs - 1; i >= 0; i--) {
final 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) {
final 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).");
// }
referenceTypeIsInitialized(o, rFromStack);
} 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)) { // could be a ReturnaddressType
constraintViolated(o, "Expecting an ObjectType as 'objectref' on the stack, not a '" + objref + "'.");
} 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 countedCount = 1; // 1 for the objectref
for (int i = 0; i < nargs; i++) {
countedCount += argtypes[i].getSize();
}
if (count != countedCount) {
constraintViolated(o, "The 'count' argument should probably read '" + countedCount + "' but is '" + count + "'.");
}
}
private int visitInvokeInternals(final InvokeInstruction o) throws ClassNotFoundException {
final Type t = o.getType(cpg);
if (t instanceof ObjectType) {
final String name = ((ObjectType) t).getClassName();
final Verifier v = VerifierFactory.getVerifier(name);
final VerificationResult vr = v.doPass2();
if (vr.getStatus() != VerificationResult.VERIFIED_OK) {
constraintViolated(o, "Class '" + name + "' is referenced, but cannot be loaded and resolved: '" + vr + "'.");
}
}
final Type[] argtypes = o.getArgumentTypes(cpg);
final int nargs = argtypes.length;
for (int i = nargs - 1; i >= 0; i--) {
final 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) {
final ReferenceType rFromStack = (ReferenceType) fromStack;
final 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).");
}
referenceTypeIsInitialized(o, rFromStack);
} else {
constraintViolated(o, "Expecting a '" + fromDesc + "' but found a '" + fromStack + "' on the stack.");
}
}
}
return nargs;
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitINVOKESPECIAL(final INVOKESPECIAL o) {
try {
// Don't init an object twice.
if (o.getMethodName(cpg).equals(Const.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).
final int nargs = visitInvokeInternals(o);
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 objRefClassName = null;
if (!o.getMethodName(cpg).equals(Const.CONSTRUCTOR_NAME)) {
referenceTypeIsInitialized(o, (ReferenceType) objref);
if (!(objref instanceof ObjectType)) {
if (!(objref instanceof ArrayType)) { // could be a ReturnaddressType
constraintViolated(o, "Expecting an ObjectType as 'objectref' on the stack, not a '" + objref + "'.");
} else {
objref = GENERIC_ARRAY;
}
}
objRefClassName = ((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).");
}
objRefClassName = ((UninitializedObjectType) objref).getInitialized().getClassName();
}
final String theClass = o.getClassName(cpg);
if (!Repository.instanceOf(objRefClassName, theClass)) {
constraintViolated(o, "The 'objref' item '" + objref + "' does not implement '" + theClass + "' as expected.");
}
} catch (final ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e, e);
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitINVOKESTATIC(final INVOKESTATIC o) {
try {
// Method is not native, otherwise pass 3 would not happen.
visitInvokeInternals(o);
} catch (final ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e, e);
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitINVOKEVIRTUAL(final INVOKEVIRTUAL o) {
try {
// the o.getClassType(cpg) type has passed pass 2; see visitLoadClass(o).
final int nargs = visitInvokeInternals(o);
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)) { // could be a ReturnaddressType
constraintViolated(o, "Expecting an ObjectType as 'objectref' on the stack, not a '" + objref + "'.");
} else {
objref = GENERIC_ARRAY;
}
}
final String objRefClassName = ((ObjectType) objref).getClassName();
final String theClass = o.getClassName(cpg);
if (!Repository.instanceOf(objRefClassName, theClass)) {
constraintViolated(o, "The 'objref' item '" + objref + "' does not implement '" + theClass + "' as expected.");
}
} catch (final ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e, e);
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitIOR(final 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.
*/
@Override
public void visitIREM(final 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.
*/
@Override
public void visitIRETURN(final 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.
*/
@Override
public void visitISHL(final 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.
*/
@Override
public void visitISHR(final 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.
*/
@Override
public void visitISTORE(final ISTORE o) {
// visitStoreInstruction(StoreInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitISUB(final 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.
*/
@Override
public void visitIUSHR(final 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.
*/
@Override
public void visitIXOR(final 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.
*/
@Override
public void visitJSR(final JSR o) {
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitJSR_W(final JSR_W o) {
// nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitL2D(final 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.
*/
@Override
public void visitL2F(final 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.
*/
@Override
public void visitL2I(final 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.
*/
@Override
public void visitLADD(final 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.
*/
@Override
public void visitLALOAD(final 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) + "'.");
}
final 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.
*/
@Override
public void visitLAND(final 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.
*/
@Override
public void visitLASTORE(final 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) + "'.");
}
final 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.
*/
@Override
public void visitLCMP(final 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.
*/
@Override
public void visitLCONST(final LCONST o) {
// Nothing to do here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitLDC(final LDC o) {
// visitCPInstruction is called first.
final Constant c = cpg.getConstant(o.getIndex());
if (!(c instanceof ConstantInteger || c instanceof ConstantFloat || c instanceof ConstantString || c instanceof ConstantClass)) {
constraintViolated(o,
"Referenced constant should be a CONSTANT_Integer, a CONSTANT_Float, a CONSTANT_String or a CONSTANT_Class, but is '" + c + "'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
public void visitLDC_W(final LDC_W o) {
// visitCPInstruction is called first.
final Constant c = cpg.getConstant(o.getIndex());
if (!(c instanceof ConstantInteger || c instanceof ConstantFloat || c instanceof ConstantString || c instanceof ConstantClass)) {
constraintViolated(o,
"Referenced constant should be a CONSTANT_Integer, a CONSTANT_Float, a CONSTANT_String or a CONSTANT_Class, but is '" + c + "'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitLDC2_W(final LDC2_W o) {
// visitCPInstruction is called first.
final 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.
*/
@Override
public void visitLDIV(final 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.
*/
@Override
public void visitLLOAD(final LLOAD o) {
// visitLoadInstruction(LoadInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitLMUL(final 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.
*/
@Override
public void visitLNEG(final 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() + "'.");
}
}
/**
* Assures the generic preconditions of a LoadClass instance. The referenced class is loaded and pass2-verified.
*/
@Override
public void visitLoadClass(final LoadClass o) {
final ObjectType t = o.getLoadClassType(cpg);
if (t != null) {// null means "no class is loaded"
final Verifier v = VerifierFactory.getVerifier(t.getClassName());
final 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 + "'.");
}
}
}
/**
* Assures the generic preconditions of a LoadInstruction instance.
*/
@Override
public void visitLoadInstruction(final 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 && 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 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 LocalVariableInstruction instance. That is, the index of the local variable
* must be valid.
*/
@Override
public void visitLocalVariableInstruction(final 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.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitLOOKUPSWITCH(final 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.
*/
@Override
public void visitLOR(final 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.
*/
@Override
public void visitLREM(final 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.
*/
@Override
public void visitLRETURN(final 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.
*/
@Override
public void visitLSHL(final 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.
*/
@Override
public void visitLSHR(final 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.
*/
@Override
public void visitLSTORE(final LSTORE o) {
// visitStoreInstruction(StoreInstruction) is called before.
// Nothing else needs to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitLSUB(final 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.
*/
@Override
public void visitLUSHR(final 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.
*/
@Override
public void visitLXOR(final 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.
*/
@Override
public void visitMONITORENTER(final 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.
*/
@Override
public void visitMONITOREXIT(final 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.
*/
@Override
public void visitMULTIANEWARRAY(final MULTIANEWARRAY o) {
final 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.
*/
@Override
public void visitNEW(final NEW o) {
// visitCPInstruction(CPInstruction) has been called before.
// visitLoadClass(LoadClass) has been called before.
final 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 + "'.");
}
final ObjectType obj = (ObjectType) t;
// e.g.: Don't instantiate interfaces
try {
if (!obj.referencesClassExact()) {
constraintViolated(o, "Expecting a class type (ObjectType) to work on. Found: '" + obj + "'.");
}
} catch (final ClassNotFoundException e) {
constraintViolated(o, "Expecting a class type (ObjectType) to work on. Found: '" + obj + "'." + " which threw " + e);
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitNEWARRAY(final 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.
*/
@Override
public void visitNOP(final NOP o) {
// nothing is to be done here.
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitPOP(final 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.
*/
@Override
public void visitPOP2(final 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.
*/
@Override
public void visitPUTFIELD(final PUTFIELD o) {
try {
final 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 + "'.");
}
final Field f = visitFieldInstructionInternals(o);
if (f.isProtected()) {
final ObjectType classtype = getObjectType(o);
final ObjectType curr = ObjectType.getInstance(mg.getClassName());
if (classtype.equals(curr) || curr.subclassOf(classtype)) {
final 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 + "'.");
}
final 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 (final ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e, e);
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitPUTSTATIC(final PUTSTATIC o) {
try {
visitFieldInstructionInternals(o);
} catch (final ClassNotFoundException e) {
// FIXME: maybe not the best way to handle this
throw new AssertionViolatedException("Missing class: " + e, e);
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitRET(final 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("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.
*/
@Override
public void visitRETURN(final RETURN o) {
if (mg.getName().equals(Const.CONSTRUCTOR_NAME) && Frame.getThis() != null && !mg.getClassName().equals(Type.OBJECT.getClassName())) {
constraintViolated(o, "Leaving a constructor that itself did not call a constructor.");
}
}
/**
* Assures the generic preconditions of a ReturnInstruction instance.
*/
@Override
public void visitReturnInstruction(final ReturnInstruction o) {
Type methodType = mg.getType();
if (methodType == Type.BOOLEAN || methodType == Type.BYTE || methodType == Type.SHORT || methodType == Type.CHAR) {
methodType = Type.INT;
}
if (o instanceof RETURN) {
if (methodType == Type.VOID) {
return;
}
constraintViolated(o, "RETURN instruction in non-void method.");
}
if (o instanceof ARETURN) {
if (methodType == Type.VOID) {
constraintViolated(o, "ARETURN instruction in void method.");
}
if (stack().peek() == Type.NULL) {
return;
}
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 (!methodType.equals(stack().peek())) {
constraintViolated(o, "Current method has return type of '" + mg.getType() + "' expecting a '" + methodType
+ "' on top of the stack. But stack top is a '" + stack().peek() + "'.");
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitSALOAD(final 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) + "'.");
}
final 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.
*/
@Override
public void visitSASTORE(final 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) + "'.");
}
final 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.
*/
@Override
public void visitSIPUSH(final SIPUSH o) {
// nothing to do here. Generic visitXXX() methods did the trick before.
}
/**
* Ensures the general preconditions of a StackConsumer instance.
*/
@Override
public void visitStackConsumer(final StackConsumer o) {
_visitStackAccessor((Instruction) o);
}
/**
* Ensures the general preconditions of a StackInstruction instance.
*/
@Override
public void visitStackInstruction(final StackInstruction o) {
_visitStackAccessor(o);
}
/**
* Ensures the general preconditions of a StackProducer instance.
*/
@Override
public void visitStackProducer(final StackProducer o) {
_visitStackAccessor((Instruction) o);
}
/**
* Assures the generic preconditions of a StoreInstruction instance.
*/
@Override
public void visitStoreInstruction(final 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 implicitly 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
final 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);
// }
}
}
/**
* Ensures the specific preconditions of the said instruction.
*/
@Override
public void visitSWAP(final 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.
*/
@Override
public void visitTABLESWITCH(final TABLESWITCH o) {
indexOfInt(o, stack().peek());
// See Pass 3a.
}
}
⏎ org/apache/bcel/verifier/structurals/InstConstraintVisitor.java
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