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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 {
public BasicInterpreter() {
super(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 Error("Internal error");
}
}
@Override
public BasicValue newOperation(final AbstractInsnNode insn)
throws AnalyzerException {
switch (insn.getOpcode()) {
case ACONST_NULL:
return newValue(Type.getObjectType("null"));
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 cst = ((LdcInsnNode) insn).cst;
if (cst instanceof Integer) {
return BasicValue.INT_VALUE;
} else if (cst instanceof Float) {
return BasicValue.FLOAT_VALUE;
} else if (cst instanceof Long) {
return BasicValue.LONG_VALUE;
} else if (cst instanceof Double) {
return BasicValue.DOUBLE_VALUE;
} else if (cst instanceof String) {
return newValue(Type.getObjectType("java/lang/String"));
} else if (cst instanceof Type) {
int sort = ((Type) cst).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 IllegalArgumentException("Illegal LDC constant "
+ cst);
}
} else if (cst instanceof Handle) {
return newValue(Type
.getObjectType("java/lang/invoke/MethodHandle"));
} else {
throw new IllegalArgumentException("Illegal LDC constant "
+ cst);
}
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 Error("Internal error.");
}
}
@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:
throw new AnalyzerException(insn, "Invalid array type");
}
case ANEWARRAY:
String desc = ((TypeInsnNode) insn).desc;
return newValue(Type.getType("[" + Type.getObjectType(desc)));
case ARRAYLENGTH:
return BasicValue.INT_VALUE;
case ATHROW:
return null;
case CHECKCAST:
desc = ((TypeInsnNode) insn).desc;
return newValue(Type.getObjectType(desc));
case INSTANCEOF:
return BasicValue.INT_VALUE;
case MONITORENTER:
case MONITOREXIT:
case IFNULL:
case IFNONNULL:
return null;
default:
throw new Error("Internal error.");
}
}
@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 Error("Internal error.");
}
}
@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 {
}
@Override
public BasicValue merge(final BasicValue v, final BasicValue w) {
if (!v.equals(w)) {
return BasicValue.UNINITIALIZED_VALUE;
}
return v;
}
}
