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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 scouter.org.objectweb.asm.tree.analysis;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import scouter.org.objectweb.asm.Opcodes;
import scouter.org.objectweb.asm.Type;
import scouter.org.objectweb.asm.tree.AbstractInsnNode;
import scouter.org.objectweb.asm.tree.FieldInsnNode;
import scouter.org.objectweb.asm.tree.InvokeDynamicInsnNode;
import scouter.org.objectweb.asm.tree.LdcInsnNode;
import scouter.org.objectweb.asm.tree.MethodInsnNode;
/**
* An {@link Interpreter} for {@link SourceValue} values.
*
* @author Eric Bruneton
*/
public class SourceInterpreter extends Interpreter implements Opcodes {
/**
* Constructs a new {@link SourceInterpreter} for the latest ASM API version. Subclasses must
* not use this constructor. Instead, they must use the {@link #SourceInterpreter(int)}
* version.
*/
public SourceInterpreter() {
super(ASM6);
if (getClass() != SourceInterpreter.class) {
throw new IllegalStateException();
}
}
/**
* Constructs a new {@link SourceInterpreter}.
*
* @param api the ASM API version supported by this interpreter. Must be one of {@link
* Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link
* Opcodes#ASM6} or {@link Opcodes#ASM7_EXPERIMENTAL}.
*/
protected SourceInterpreter(final int api) {
super(api);
}
@Override
public SourceValue newValue(final Type type) {
if (type == Type.VOID_TYPE) {
return null;
}
return new SourceValue(type == null ? 1 : type.getSize());
}
@Override
public SourceValue newOperation(final AbstractInsnNode insn) {
int size;
switch (insn.getOpcode()) {
case LCONST_0:
case LCONST_1:
case DCONST_0:
case DCONST_1:
size = 2;
break;
case LDC:
Object value = ((LdcInsnNode) insn).cst;
size = value instanceof Long || value instanceof Double ? 2 : 1;
break;
case GETSTATIC:
size = Type.getType(((FieldInsnNode) insn).desc).getSize();
break;
default:
size = 1;
}
return new SourceValue(size, insn);
}
@Override
public SourceValue copyOperation(final AbstractInsnNode insn, final SourceValue value) {
return new SourceValue(value.getSize(), insn);
}
@Override
public SourceValue unaryOperation(final AbstractInsnNode insn, final SourceValue value) {
int size;
switch (insn.getOpcode()) {
case LNEG:
case DNEG:
case I2L:
case I2D:
case L2D:
case F2L:
case F2D:
case D2L:
size = 2;
break;
case GETFIELD:
size = Type.getType(((FieldInsnNode) insn).desc).getSize();
break;
default:
size = 1;
}
return new SourceValue(size, insn);
}
@Override
public SourceValue binaryOperation(
final AbstractInsnNode insn, final SourceValue value1, final SourceValue value2) {
int size;
switch (insn.getOpcode()) {
case LALOAD:
case DALOAD:
case LADD:
case DADD:
case LSUB:
case DSUB:
case LMUL:
case DMUL:
case LDIV:
case DDIV:
case LREM:
case DREM:
case LSHL:
case LSHR:
case LUSHR:
case LAND:
case LOR:
case LXOR:
size = 2;
break;
default:
size = 1;
}
return new SourceValue(size, insn);
}
@Override
public SourceValue ternaryOperation(
final AbstractInsnNode insn,
final SourceValue value1,
final SourceValue value2,
final SourceValue value3) {
return new SourceValue(1, insn);
}
@Override
public SourceValue naryOperation(
final AbstractInsnNode insn, final List values) {
int size;
int opcode = insn.getOpcode();
if (opcode == MULTIANEWARRAY) {
size = 1;
} else if (opcode == INVOKEDYNAMIC) {
size = Type.getReturnType(((InvokeDynamicInsnNode) insn).desc).getSize();
} else {
size = Type.getReturnType(((MethodInsnNode) insn).desc).getSize();
}
return new SourceValue(size, insn);
}
@Override
public void returnOperation(
final AbstractInsnNode insn, final SourceValue value, final SourceValue expected) {
// Nothing to do.
}
@Override
public SourceValue merge(final SourceValue value1, final SourceValue value2) {
if (value1.insns instanceof SmallSet && value2.insns instanceof SmallSet) {
Set setUnion =
((SmallSet) value1.insns)
.union((SmallSet) value2.insns);
if (setUnion == value1.insns && value1.size == value2.size) {
return value1;
} else {
return new SourceValue(Math.min(value1.size, value2.size), setUnion);
}
}
if (value1.size != value2.size || !value1.insns.containsAll(value2.insns)) {
HashSet setUnion = new HashSet();
setUnion.addAll(value1.insns);
setUnion.addAll(value2.insns);
return new SourceValue(Math.min(value1.size, value2.size), setUnion);
}
return value1;
}
}
