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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.RegisterSpec;
import com.android.dx.rop.code.RegisterSpecList;
import com.android.dx.rop.cst.Constant;
import com.android.dx.rop.cst.CstFieldRef;
import com.android.dx.rop.cst.CstString;
import com.android.dx.rop.cst.CstType;
import com.android.dx.util.AnnotatedOutput;
import java.util.BitSet;
/**
* Instruction format {@code 21c}. See the instruction format spec
* for details.
*/
public final class Form21c extends InsnFormat {
/** {@code non-null;} unique instance of this class */
public static final InsnFormat THE_ONE = new Form21c();
/**
* Constructs an instance. This class is not publicly
* instantiable. Use {@link #THE_ONE}.
*/
private Form21c() {
// This space intentionally left blank.
}
/** {@inheritDoc} */
@Override
public String insnArgString(DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
return regs.get(0).regString() + ", " + cstString(insn);
}
/** {@inheritDoc} */
@Override
public String insnCommentString(DalvInsn insn, boolean noteIndices) {
if (noteIndices) {
return cstComment(insn);
} else {
return "";
}
}
/** {@inheritDoc} */
@Override
public int codeSize() {
return 2;
}
/** {@inheritDoc} */
@Override
public boolean isCompatible(DalvInsn insn) {
if (!(insn instanceof CstInsn)) {
return false;
}
RegisterSpecList regs = insn.getRegisters();
RegisterSpec reg;
switch (regs.size()) {
case 1: {
reg = regs.get(0);
break;
}
case 2: {
/*
* This format is allowed for ops that are effectively
* 2-arg but where the two args are identical.
*/
reg = regs.get(0);
if (reg.getReg() != regs.get(1).getReg()) {
return false;
}
break;
}
default: {
return false;
}
}
if (!unsignedFitsInByte(reg.getReg())) {
return false;
}
CstInsn ci = (CstInsn) insn;
int cpi = ci.getIndex();
Constant cst = ci.getConstant();
if (! unsignedFitsInShort(cpi)) {
return false;
}
return (cst instanceof CstType) ||
(cst instanceof CstFieldRef) ||
(cst instanceof CstString);
}
/** {@inheritDoc} */
@Override
public BitSet compatibleRegs(DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
int sz = regs.size();
BitSet bits = new BitSet(sz);
boolean compat = unsignedFitsInByte(regs.get(0).getReg());
if (sz == 1) {
bits.set(0, compat);
} else {
if (regs.get(0).getReg() == regs.get(1).getReg()) {
bits.set(0, compat);
bits.set(1, compat);
}
}
return bits;
}
/** {@inheritDoc} */
@Override
public void writeTo(AnnotatedOutput out, DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
int cpi = ((CstInsn) insn).getIndex();
write(out,
opcodeUnit(insn, regs.get(0).getReg()),
(short) cpi);
}
}
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