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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.dexgen.dex.code.form;
import com.android.dexgen.dex.code.DalvInsn;
import com.android.dexgen.dex.code.InsnFormat;
import com.android.dexgen.dex.code.TargetInsn;
import com.android.dexgen.rop.code.RegisterSpecList;
import com.android.dexgen.util.AnnotatedOutput;
/**
* Instruction format {@code 31t}. See the instruction format spec
* for details.
*/
public final class Form31t extends InsnFormat {
/** {@code non-null;} unique instance of this class */
public static final InsnFormat THE_ONE = new Form31t();
/**
* Constructs an instance. This class is not publicly
* instantiable. Use {@link #THE_ONE}.
*/
private Form31t() {
// This space intentionally left blank.
}
/** {@inheritDoc} */
@Override
public String insnArgString(DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
return regs.get(0).regString() + ", " + branchString(insn);
}
/** {@inheritDoc} */
@Override
public String insnCommentString(DalvInsn insn, boolean noteIndices) {
return branchComment(insn);
}
/** {@inheritDoc} */
@Override
public int codeSize() {
return 3;
}
/** {@inheritDoc} */
@Override
public boolean isCompatible(DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
if (!((insn instanceof TargetInsn) &&
(regs.size() == 1) &&
unsignedFitsInByte(regs.get(0).getReg()))) {
return false;
}
return true;
}
/** {@inheritDoc} */
@Override
public boolean branchFits(TargetInsn insn) {
return true;
}
/** {@inheritDoc} */
@Override
public InsnFormat nextUp() {
return null;
}
/** {@inheritDoc} */
@Override
public void writeTo(AnnotatedOutput out, DalvInsn insn) {
RegisterSpecList regs = insn.getRegisters();
int offset = ((TargetInsn) insn).getTargetOffset();
write(out, opcodeUnit(insn, regs.get(0).getReg()),
(short) offset,
(short) (offset >> 16));
}
}
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