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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.Handle;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.FieldInsnNode;
import org.objectweb.asm.tree.IntInsnNode;
import org.objectweb.asm.tree.InvokeDynamicInsnNode;
import org.objectweb.asm.tree.LdcInsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MultiANewArrayInsnNode;
import org.objectweb.asm.tree.TypeInsnNode;
/**
* An {@link Interpreter} for {@link BasicValue} values.
*
* @author Eric Bruneton
* @author Bing Ran
*/
public class BasicInterpreter extends Interpreter implements Opcodes {
/**
* Special type used for the null literal. This is an object reference type with
* descriptor 'Lnull;'.
*/
public static final Type NULL_TYPE = Type.getObjectType("null");
/**
* Constructs a new {@link BasicInterpreter} for the latest ASM API version. Subclasses must not
* use this constructor. Instead, they must use the {@link #BasicInterpreter(int)} version.
*/
public BasicInterpreter() {
super(ASM6);
if (getClass() != BasicInterpreter.class) {
throw new IllegalStateException();
}
}
/**
* Constructs a new {@link BasicInterpreter}.
*
* @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} or {@link
* org.objectweb.asm.Opcodes#ASM6}.
*/
protected BasicInterpreter(final int api) {
super(api);
}
@Override
public BasicValue newValue(final Type type) {
if (type == null) {
return BasicValue.UNINITIALIZED_VALUE;
}
switch (type.getSort()) {
case Type.VOID:
return null;
case Type.BOOLEAN:
case Type.CHAR:
case Type.BYTE:
case Type.SHORT:
case Type.INT:
return BasicValue.INT_VALUE;
case Type.FLOAT:
return BasicValue.FLOAT_VALUE;
case Type.LONG:
return BasicValue.LONG_VALUE;
case Type.DOUBLE:
return BasicValue.DOUBLE_VALUE;
case Type.ARRAY:
case Type.OBJECT:
return BasicValue.REFERENCE_VALUE;
default:
throw new AssertionError();
}
}
@Override
public BasicValue newOperation(final AbstractInsnNode insn) throws AnalyzerException {
switch (insn.getOpcode()) {
case ACONST_NULL:
return newValue(NULL_TYPE);
case ICONST_M1:
case ICONST_0:
case ICONST_1:
case ICONST_2:
case ICONST_3:
case ICONST_4:
case ICONST_5:
return BasicValue.INT_VALUE;
case LCONST_0:
case LCONST_1:
return BasicValue.LONG_VALUE;
case FCONST_0:
case FCONST_1:
case FCONST_2:
return BasicValue.FLOAT_VALUE;
case DCONST_0:
case DCONST_1:
return BasicValue.DOUBLE_VALUE;
case BIPUSH:
case SIPUSH:
return BasicValue.INT_VALUE;
case LDC:
Object value = ((LdcInsnNode) insn).cst;
if (value instanceof Integer) {
return BasicValue.INT_VALUE;
} else if (value instanceof Float) {
return BasicValue.FLOAT_VALUE;
} else if (value instanceof Long) {
return BasicValue.LONG_VALUE;
} else if (value instanceof Double) {
return BasicValue.DOUBLE_VALUE;
} else if (value instanceof String) {
return newValue(Type.getObjectType("java/lang/String"));
} else if (value instanceof Type) {
int sort = ((Type) value).getSort();
if (sort == Type.OBJECT || sort == Type.ARRAY) {
return newValue(Type.getObjectType("java/lang/Class"));
} else if (sort == Type.METHOD) {
return newValue(Type.getObjectType("java/lang/invoke/MethodType"));
} else {
throw new AnalyzerException(insn, "Illegal LDC value " + value);
}
} else if (value instanceof Handle) {
return newValue(Type.getObjectType("java/lang/invoke/MethodHandle"));
} else {
throw new AnalyzerException(insn, "Illegal LDC value " + value);
}
case JSR:
return BasicValue.RETURNADDRESS_VALUE;
case GETSTATIC:
return newValue(Type.getType(((FieldInsnNode) insn).desc));
case NEW:
return newValue(Type.getObjectType(((TypeInsnNode) insn).desc));
default:
throw new AssertionError();
}
}
@Override
public BasicValue copyOperation(final AbstractInsnNode insn, final BasicValue value)
throws AnalyzerException {
return value;
}
@Override
public BasicValue unaryOperation(final AbstractInsnNode insn, final BasicValue value)
throws AnalyzerException {
switch (insn.getOpcode()) {
case INEG:
case IINC:
case L2I:
case F2I:
case D2I:
case I2B:
case I2C:
case I2S:
return BasicValue.INT_VALUE;
case FNEG:
case I2F:
case L2F:
case D2F:
return BasicValue.FLOAT_VALUE;
case LNEG:
case I2L:
case F2L:
case D2L:
return BasicValue.LONG_VALUE;
case DNEG:
case I2D:
case L2D:
case F2D:
return BasicValue.DOUBLE_VALUE;
case IFEQ:
case IFNE:
case IFLT:
case IFGE:
case IFGT:
case IFLE:
case TABLESWITCH:
case LOOKUPSWITCH:
case IRETURN:
case LRETURN:
case FRETURN:
case DRETURN:
case ARETURN:
case PUTSTATIC:
return null;
case GETFIELD:
return newValue(Type.getType(((FieldInsnNode) insn).desc));
case NEWARRAY:
switch (((IntInsnNode) insn).operand) {
case T_BOOLEAN:
return newValue(Type.getType("[Z"));
case T_CHAR:
return newValue(Type.getType("[C"));
case T_BYTE:
return newValue(Type.getType("[B"));
case T_SHORT:
return newValue(Type.getType("[S"));
case T_INT:
return newValue(Type.getType("[I"));
case T_FLOAT:
return newValue(Type.getType("[F"));
case T_DOUBLE:
return newValue(Type.getType("[D"));
case T_LONG:
return newValue(Type.getType("[J"));
default:
break;
}
throw new AnalyzerException(insn, "Invalid array type");
case ANEWARRAY:
return newValue(Type.getType("[" + Type.getObjectType(((TypeInsnNode) insn).desc)));
case ARRAYLENGTH:
return BasicValue.INT_VALUE;
case ATHROW:
return null;
case CHECKCAST:
return newValue(Type.getObjectType(((TypeInsnNode) insn).desc));
case INSTANCEOF:
return BasicValue.INT_VALUE;
case MONITORENTER:
case MONITOREXIT:
case IFNULL:
case IFNONNULL:
return null;
default:
throw new AssertionError();
}
}
@Override
public BasicValue binaryOperation(
final AbstractInsnNode insn, final BasicValue value1, final BasicValue value2)
throws AnalyzerException {
switch (insn.getOpcode()) {
case IALOAD:
case BALOAD:
case CALOAD:
case SALOAD:
case IADD:
case ISUB:
case IMUL:
case IDIV:
case IREM:
case ISHL:
case ISHR:
case IUSHR:
case IAND:
case IOR:
case IXOR:
return BasicValue.INT_VALUE;
case FALOAD:
case FADD:
case FSUB:
case FMUL:
case FDIV:
case FREM:
return BasicValue.FLOAT_VALUE;
case LALOAD:
case LADD:
case LSUB:
case LMUL:
case LDIV:
case LREM:
case LSHL:
case LSHR:
case LUSHR:
case LAND:
case LOR:
case LXOR:
return BasicValue.LONG_VALUE;
case DALOAD:
case DADD:
case DSUB:
case DMUL:
case DDIV:
case DREM:
return BasicValue.DOUBLE_VALUE;
case AALOAD:
return BasicValue.REFERENCE_VALUE;
case LCMP:
case FCMPL:
case FCMPG:
case DCMPL:
case DCMPG:
return BasicValue.INT_VALUE;
case IF_ICMPEQ:
case IF_ICMPNE:
case IF_ICMPLT:
case IF_ICMPGE:
case IF_ICMPGT:
case IF_ICMPLE:
case IF_ACMPEQ:
case IF_ACMPNE:
case PUTFIELD:
return null;
default:
throw new AssertionError();
}
}
@Override
public BasicValue ternaryOperation(
final AbstractInsnNode insn,
final BasicValue value1,
final BasicValue value2,
final BasicValue value3)
throws AnalyzerException {
return null;
}
@Override
public BasicValue naryOperation(
final AbstractInsnNode insn, final List values)
throws AnalyzerException {
int opcode = insn.getOpcode();
if (opcode == MULTIANEWARRAY) {
return newValue(Type.getType(((MultiANewArrayInsnNode) insn).desc));
} else if (opcode == INVOKEDYNAMIC) {
return newValue(Type.getReturnType(((InvokeDynamicInsnNode) insn).desc));
} else {
return newValue(Type.getReturnType(((MethodInsnNode) insn).desc));
}
}
@Override
public void returnOperation(
final AbstractInsnNode insn, final BasicValue value, final BasicValue expected)
throws AnalyzerException {
// Nothing to do.
}
@Override
public BasicValue merge(final BasicValue value1, final BasicValue value2) {
if (!value1.equals(value2)) {
return BasicValue.UNINITIALIZED_VALUE;
}
return value1;
}
}
