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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed 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 com.android.dx.dex.code.form;
import com.android.dx.dex.code.CstInsn;
import com.android.dx.dex.code.DalvInsn;
import com.android.dx.dex.code.InsnFormat;
import com.android.dx.rop.code.RegisterSpecList;
import com.android.dx.rop.cst.Constant;
import com.android.dx.rop.cst.CstLiteralBits;
import com.android.dx.util.AnnotatedOutput;
import java.util.BitSet;
/**
* Instruction format {@code 22s}. See the instruction format spec
* for details.
*/
public final class Form22s extends InsnFormat {
/** {@code non-null;} unique instance of this class */
public static final InsnFormat THE_ONE = new Form22s();
/**
* Constructs an instance. This class is not publicly
* instantiable. Use {@link #THE_ONE}.
*/
private Form22s() {
// This space intentionally left blank.
}
/** {@inheritDoc} */
@Override
public String insnArgString(DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
CstLiteralBits value = (CstLiteralBits) ((CstInsn) insn).getConstant();
return regs.get(0).regString() + ", " + regs.get(1).regString()
+ ", " + literalBitsString(value);
}
/** {@inheritDoc} */
@Override
public String insnCommentString(DalvInsn insn, boolean noteIndices) {
CstLiteralBits value = (CstLiteralBits) ((CstInsn) insn).getConstant();
return literalBitsComment(value, 16);
}
/** {@inheritDoc} */
@Override
public int codeSize() {
return 2;
}
/** {@inheritDoc} */
@Override
public boolean isCompatible(DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
if (!((insn instanceof CstInsn) &&
(regs.size() == 2) &&
unsignedFitsInNibble(regs.get(0).getReg()) &&
unsignedFitsInNibble(regs.get(1).getReg()))) {
return false;
}
CstInsn ci = (CstInsn) insn;
Constant cst = ci.getConstant();
if (!(cst instanceof CstLiteralBits)) {
return false;
}
CstLiteralBits cb = (CstLiteralBits) cst;
return cb.fitsInInt() && signedFitsInShort(cb.getIntBits());
}
/** {@inheritDoc} */
@Override
public BitSet compatibleRegs(DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
BitSet bits = new BitSet(2);
bits.set(0, unsignedFitsInNibble(regs.get(0).getReg()));
bits.set(1, unsignedFitsInNibble(regs.get(1).getReg()));
return bits;
}
/** {@inheritDoc} */
@Override
public void writeTo(AnnotatedOutput out, DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
int value =
((CstLiteralBits) ((CstInsn) insn).getConstant()).getIntBits();
write(out,
opcodeUnit(insn,
makeByte(regs.get(0).getReg(), regs.get(1).getReg())),
(short) value);
}
}
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