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// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
package org.objectweb.asm.tree.analysis;
import java.util.List;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.FieldInsnNode;
import org.objectweb.asm.tree.InvokeDynamicInsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
/**
* An extended {@link BasicInterpreter} that checks that bytecode instructions are correctly used.
*
* @author Eric Bruneton
* @author Bing Ran
*/
public class BasicVerifier extends BasicInterpreter {
/**
* Constructs a new {@link BasicVerifier} for the latest ASM API version. Subclasses must not
* use this constructor. Instead, they must use the {@link #BasicVerifier(int)} version.
*/
public BasicVerifier() {
super(ASM7);
if (getClass() != BasicVerifier.class) {
throw new IllegalStateException();
}
}
/**
* Constructs a new {@link BasicVerifier}.
*
* @param api the ASM API version supported by this interpreter. Must be one of {@link
* org.objectweb.asm.Opcodes#ASM4}, {@link org.objectweb.asm.Opcodes#ASM5}, {@link
* org.objectweb.asm.Opcodes#ASM6} or {@link org.objectweb.asm.Opcodes#ASM7}.
*/
protected BasicVerifier(final int api) {
super(api);
}
@Override
public BasicValue copyOperation(final AbstractInsnNode insn, final BasicValue value)
throws AnalyzerException {
Value expected;
switch (insn.getOpcode()) {
case ILOAD:
case ISTORE:
expected = BasicValue.INT_VALUE;
break;
case FLOAD:
case FSTORE:
expected = BasicValue.FLOAT_VALUE;
break;
case LLOAD:
case LSTORE:
expected = BasicValue.LONG_VALUE;
break;
case DLOAD:
case DSTORE:
expected = BasicValue.DOUBLE_VALUE;
break;
case ALOAD:
if (!value.isReference()) {
throw new AnalyzerException(insn, null, "an object reference", value);
}
return value;
case ASTORE:
if (!value.isReference() && !BasicValue.RETURNADDRESS_VALUE.equals(value)) {
throw new AnalyzerException(insn, null, "an object reference or a return address", value);
}
return value;
default:
return value;
}
if (!expected.equals(value)) {
throw new AnalyzerException(insn, null, expected, value);
}
return value;
}
@Override
public BasicValue unaryOperation(final AbstractInsnNode insn, final BasicValue value)
throws AnalyzerException {
BasicValue expected;
switch (insn.getOpcode()) {
case INEG:
case IINC:
case I2F:
case I2L:
case I2D:
case I2B:
case I2C:
case I2S:
case IFEQ:
case IFNE:
case IFLT:
case IFGE:
case IFGT:
case IFLE:
case TABLESWITCH:
case LOOKUPSWITCH:
case IRETURN:
case NEWARRAY:
case ANEWARRAY:
expected = BasicValue.INT_VALUE;
break;
case FNEG:
case F2I:
case F2L:
case F2D:
case FRETURN:
expected = BasicValue.FLOAT_VALUE;
break;
case LNEG:
case L2I:
case L2F:
case L2D:
case LRETURN:
expected = BasicValue.LONG_VALUE;
break;
case DNEG:
case D2I:
case D2F:
case D2L:
case DRETURN:
expected = BasicValue.DOUBLE_VALUE;
break;
case GETFIELD:
expected = newValue(Type.getObjectType(((FieldInsnNode) insn).owner));
break;
case ARRAYLENGTH:
if (!isArrayValue(value)) {
throw new AnalyzerException(insn, null, "an array reference", value);
}
return super.unaryOperation(insn, value);
case CHECKCAST:
case ARETURN:
case ATHROW:
case INSTANCEOF:
case MONITORENTER:
case MONITOREXIT:
case IFNULL:
case IFNONNULL:
if (!value.isReference()) {
throw new AnalyzerException(insn, null, "an object reference", value);
}
return super.unaryOperation(insn, value);
case PUTSTATIC:
expected = newValue(Type.getType(((FieldInsnNode) insn).desc));
break;
default:
throw new AssertionError();
}
if (!isSubTypeOf(value, expected)) {
throw new AnalyzerException(insn, null, expected, value);
}
return super.unaryOperation(insn, value);
}
@Override
public BasicValue binaryOperation(
final AbstractInsnNode insn, final BasicValue value1, final BasicValue value2)
throws AnalyzerException {
BasicValue expected1;
BasicValue expected2;
switch (insn.getOpcode()) {
case IALOAD:
expected1 = newValue(Type.getType("[I"));
expected2 = BasicValue.INT_VALUE;
break;
case BALOAD:
if (isSubTypeOf(value1, newValue(Type.getType("[Z")))) {
expected1 = newValue(Type.getType("[Z"));
} else {
expected1 = newValue(Type.getType("[B"));
}
expected2 = BasicValue.INT_VALUE;
break;
case CALOAD:
expected1 = newValue(Type.getType("[C"));
expected2 = BasicValue.INT_VALUE;
break;
case SALOAD:
expected1 = newValue(Type.getType("[S"));
expected2 = BasicValue.INT_VALUE;
break;
case LALOAD:
expected1 = newValue(Type.getType("[J"));
expected2 = BasicValue.INT_VALUE;
break;
case FALOAD:
expected1 = newValue(Type.getType("[F"));
expected2 = BasicValue.INT_VALUE;
break;
case DALOAD:
expected1 = newValue(Type.getType("[D"));
expected2 = BasicValue.INT_VALUE;
break;
case AALOAD:
expected1 = newValue(Type.getType("[Ljava/lang/Object;"));
expected2 = BasicValue.INT_VALUE;
break;
case IADD:
case ISUB:
case IMUL:
case IDIV:
case IREM:
case ISHL:
case ISHR:
case IUSHR:
case IAND:
case IOR:
case IXOR:
case IF_ICMPEQ:
case IF_ICMPNE:
case IF_ICMPLT:
case IF_ICMPGE:
case IF_ICMPGT:
case IF_ICMPLE:
expected1 = BasicValue.INT_VALUE;
expected2 = BasicValue.INT_VALUE;
break;
case FADD:
case FSUB:
case FMUL:
case FDIV:
case FREM:
case FCMPL:
case FCMPG:
expected1 = BasicValue.FLOAT_VALUE;
expected2 = BasicValue.FLOAT_VALUE;
break;
case LADD:
case LSUB:
case LMUL:
case LDIV:
case LREM:
case LAND:
case LOR:
case LXOR:
case LCMP:
expected1 = BasicValue.LONG_VALUE;
expected2 = BasicValue.LONG_VALUE;
break;
case LSHL:
case LSHR:
case LUSHR:
expected1 = BasicValue.LONG_VALUE;
expected2 = BasicValue.INT_VALUE;
break;
case DADD:
case DSUB:
case DMUL:
case DDIV:
case DREM:
case DCMPL:
case DCMPG:
expected1 = BasicValue.DOUBLE_VALUE;
expected2 = BasicValue.DOUBLE_VALUE;
break;
case IF_ACMPEQ:
case IF_ACMPNE:
expected1 = BasicValue.REFERENCE_VALUE;
expected2 = BasicValue.REFERENCE_VALUE;
break;
case PUTFIELD:
FieldInsnNode fieldInsn = (FieldInsnNode) insn;
expected1 = newValue(Type.getObjectType(fieldInsn.owner));
expected2 = newValue(Type.getType(fieldInsn.desc));
break;
default:
throw new AssertionError();
}
if (!isSubTypeOf(value1, expected1)) {
throw new AnalyzerException(insn, "First argument", expected1, value1);
} else if (!isSubTypeOf(value2, expected2)) {
throw new AnalyzerException(insn, "Second argument", expected2, value2);
}
if (insn.getOpcode() == AALOAD) {
return getElementValue(value1);
} else {
return super.binaryOperation(insn, value1, value2);
}
}
@Override
public BasicValue ternaryOperation(
final AbstractInsnNode insn,
final BasicValue value1,
final BasicValue value2,
final BasicValue value3)
throws AnalyzerException {
BasicValue expected1;
BasicValue expected3;
switch (insn.getOpcode()) {
case IASTORE:
expected1 = newValue(Type.getType("[I"));
expected3 = BasicValue.INT_VALUE;
break;
case BASTORE:
if (isSubTypeOf(value1, newValue(Type.getType("[Z")))) {
expected1 = newValue(Type.getType("[Z"));
} else {
expected1 = newValue(Type.getType("[B"));
}
expected3 = BasicValue.INT_VALUE;
break;
case CASTORE:
expected1 = newValue(Type.getType("[C"));
expected3 = BasicValue.INT_VALUE;
break;
case SASTORE:
expected1 = newValue(Type.getType("[S"));
expected3 = BasicValue.INT_VALUE;
break;
case LASTORE:
expected1 = newValue(Type.getType("[J"));
expected3 = BasicValue.LONG_VALUE;
break;
case FASTORE:
expected1 = newValue(Type.getType("[F"));
expected3 = BasicValue.FLOAT_VALUE;
break;
case DASTORE:
expected1 = newValue(Type.getType("[D"));
expected3 = BasicValue.DOUBLE_VALUE;
break;
case AASTORE:
expected1 = value1;
expected3 = BasicValue.REFERENCE_VALUE;
break;
default:
throw new AssertionError();
}
if (!isSubTypeOf(value1, expected1)) {
throw new AnalyzerException(
insn, "First argument", "a " + expected1 + " array reference", value1);
} else if (!BasicValue.INT_VALUE.equals(value2)) {
throw new AnalyzerException(insn, "Second argument", BasicValue.INT_VALUE, value2);
} else if (!isSubTypeOf(value3, expected3)) {
throw new AnalyzerException(insn, "Third argument", expected3, value3);
}
return null;
}
@Override
public BasicValue naryOperation(
final AbstractInsnNode insn, final List values)
throws AnalyzerException {
int opcode = insn.getOpcode();
if (opcode == MULTIANEWARRAY) {
for (BasicValue value : values) {
if (!BasicValue.INT_VALUE.equals(value)) {
throw new AnalyzerException(insn, null, BasicValue.INT_VALUE, value);
}
}
} else {
int i = 0;
int j = 0;
if (opcode != INVOKESTATIC && opcode != INVOKEDYNAMIC) {
Type owner = Type.getObjectType(((MethodInsnNode) insn).owner);
if (!isSubTypeOf(values.get(i++), newValue(owner))) {
throw new AnalyzerException(insn, "Method owner", newValue(owner), values.get(0));
}
}
String methodDescriptor =
(opcode == INVOKEDYNAMIC)
? ((InvokeDynamicInsnNode) insn).desc
: ((MethodInsnNode) insn).desc;
Type[] args = Type.getArgumentTypes(methodDescriptor);
while (i < values.size()) {
BasicValue expected = newValue(args[j++]);
BasicValue actual = values.get(i++);
if (!isSubTypeOf(actual, expected)) {
throw new AnalyzerException(insn, "Argument " + j, expected, actual);
}
}
}
return super.naryOperation(insn, values);
}
@Override
public void returnOperation(
final AbstractInsnNode insn, final BasicValue value, final BasicValue expected)
throws AnalyzerException {
if (!isSubTypeOf(value, expected)) {
throw new AnalyzerException(insn, "Incompatible return type", expected, value);
}
}
/**
* Returns whether the given value corresponds to an array reference.
*
* @param value a value.
* @return whether 'value' corresponds to an array reference.
*/
protected boolean isArrayValue(final BasicValue value) {
return value.isReference();
}
/**
* Returns the value corresponding to the type of the elements of the given array reference value.
*
* @param objectArrayValue a value corresponding to array of object (or array) references.
* @return the value corresponding to the type of the elements of 'objectArrayValue'.
* @throws AnalyzerException if objectArrayValue does not correspond to an array type.
*/
protected BasicValue getElementValue(final BasicValue objectArrayValue) throws AnalyzerException {
return BasicValue.REFERENCE_VALUE;
}
/**
* Returns whether the type corresponding to the first argument is a subtype of the type
* corresponding to the second argument.
*
* @param value a value.
* @param expected another value.
* @return whether the type corresponding to 'value' is a subtype of the type corresponding to
* 'expected'.
*/
protected boolean isSubTypeOf(final BasicValue value, final BasicValue expected) {
return value.equals(expected);
}
}
