com.android.dx.dex.code.form.Form52c Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of dx Show documentation
dx is an Android SDK platform tool that transforms Java bytecode (and JARs) into Dalvik VM 'DEX' code.
The newest version!
/*
 * Copyright (C) 2010 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.CstFieldRef;
import com.android.dx.rop.cst.CstType;
import com.android.dx.util.AnnotatedOutput;

import java.util.BitSet;

/**
 * Instruction format {@code 52c}. See the instruction format spec
 * for details.
 */
public final class Form52c extends InsnFormat {
    /** {@code non-null;} unique instance of this class */
    public static final InsnFormat THE_ONE = new Form52c();

    /**
     * Constructs an instance. This class is not publicly
     * instantiable. Use {@link #THE_ONE}.
     */
    private Form52c() {
        // This space intentionally left blank.
    }

    /** {@inheritDoc} */
    @Override
    public String insnArgString(DalvInsn insn) {
        RegisterSpecList regs = insn.getRegisters();
        return regs.get(0).regString() + ", " + regs.get(1).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 5;
    }

    /** {@inheritDoc} */
    @Override
    public boolean isCompatible(DalvInsn insn) {
        if (! ALLOW_EXTENDED_OPCODES) {
            return false;
        }

        RegisterSpecList regs = insn.getRegisters();
        if (!((insn instanceof CstInsn) &&
              (regs.size() == 2) &&
              unsignedFitsInShort(regs.get(0).getReg()) &&
              unsignedFitsInShort(regs.get(1).getReg()))) {
            return false;
        }

        CstInsn ci = (CstInsn) insn;
        Constant cst = ci.getConstant();

        return (cst instanceof CstType) ||
            (cst instanceof CstFieldRef);
    }

    /** {@inheritDoc} */
    @Override
    public BitSet compatibleRegs(DalvInsn insn) {
        RegisterSpecList regs = insn.getRegisters();
        BitSet bits = new BitSet(2);

        bits.set(0, unsignedFitsInShort(regs.get(0).getReg()));
        bits.set(1, unsignedFitsInShort(regs.get(1).getReg()));
        return bits;
    }

    /** {@inheritDoc} */
    @Override
    public void writeTo(AnnotatedOutput out, DalvInsn insn) {
        RegisterSpecList regs = insn.getRegisters();
        int cpi = ((CstInsn) insn).getIndex();

        write(out,
                opcodeUnit(insn),
                cpi,
                (short) regs.get(0).getReg(),
                (short) regs.get(1).getReg());
    }
}