/*

 * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.classfile;

import static com.sun.tools.classfile.Instruction.Kind.*;

import static com.sun.tools.classfile.Opcode.Set.*;

/**

 * See JVMS, chapter 6.

 *

 * <p>In addition to providing all the standard opcodes defined in JVMS,

 * this class also provides legacy support for the PicoJava extensions.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public enum Opcode {

    NOP(0x0),

    ACONST_NULL(0x1),

    ICONST_M1(0x2),

    ICONST_0(0x3),

    ICONST_1(0x4),

    ICONST_2(0x5),

    ICONST_3(0x6),

    ICONST_4(0x7),

    ICONST_5(0x8),

    LCONST_0(0x9),

    LCONST_1(0xa),

    FCONST_0(0xb),

    FCONST_1(0xc),

    FCONST_2(0xd),

    DCONST_0(0xe),

    DCONST_1(0xf),

    BIPUSH(0x10, BYTE),

    SIPUSH(0x11, SHORT),

    LDC(0x12, CPREF),

    LDC_W(0x13, CPREF_W),

    LDC2_W(0x14, CPREF_W),

    ILOAD(0x15, LOCAL),

    LLOAD(0x16, LOCAL),

    FLOAD(0x17, LOCAL),

    DLOAD(0x18, LOCAL),

    ALOAD(0x19, LOCAL),

    ILOAD_0(0x1a),

    ILOAD_1(0x1b),

    ILOAD_2(0x1c),

    ILOAD_3(0x1d),

    LLOAD_0(0x1e),

    LLOAD_1(0x1f),

    LLOAD_2(0x20),

    LLOAD_3(0x21),

    FLOAD_0(0x22),

    FLOAD_1(0x23),

    FLOAD_2(0x24),

    FLOAD_3(0x25),

    DLOAD_0(0x26),

    DLOAD_1(0x27),

    DLOAD_2(0x28),

    DLOAD_3(0x29),

    ALOAD_0(0x2a),

    ALOAD_1(0x2b),

    ALOAD_2(0x2c),

    ALOAD_3(0x2d),

    IALOAD(0x2e),

    LALOAD(0x2f),

    FALOAD(0x30),

    DALOAD(0x31),

    AALOAD(0x32),

    BALOAD(0x33),

    CALOAD(0x34),

    SALOAD(0x35),

    ISTORE(0x36, LOCAL),

    LSTORE(0x37, LOCAL),

    FSTORE(0x38, LOCAL),

    DSTORE(0x39, LOCAL),

    ASTORE(0x3a, LOCAL),

    ISTORE_0(0x3b),

    ISTORE_1(0x3c),

    ISTORE_2(0x3d),

    ISTORE_3(0x3e),

    LSTORE_0(0x3f),

    LSTORE_1(0x40),

    LSTORE_2(0x41),

    LSTORE_3(0x42),

    FSTORE_0(0x43),

    FSTORE_1(0x44),

    FSTORE_2(0x45),

    FSTORE_3(0x46),

    DSTORE_0(0x47),

    DSTORE_1(0x48),

    DSTORE_2(0x49),

    DSTORE_3(0x4a),

    ASTORE_0(0x4b),

    ASTORE_1(0x4c),

    ASTORE_2(0x4d),

    ASTORE_3(0x4e),

    IASTORE(0x4f),

    LASTORE(0x50),

    FASTORE(0x51),

    DASTORE(0x52),

    AASTORE(0x53),

    BASTORE(0x54),

    CASTORE(0x55),

    SASTORE(0x56),

    POP(0x57),

    POP2(0x58),

    DUP(0x59),

    DUP_X1(0x5a),

    DUP_X2(0x5b),

    DUP2(0x5c),

    DUP2_X1(0x5d),

    DUP2_X2(0x5e),

    SWAP(0x5f),

    IADD(0x60),

    LADD(0x61),

    FADD(0x62),

    DADD(0x63),

    ISUB(0x64),

    LSUB(0x65),

    FSUB(0x66),

    DSUB(0x67),

    IMUL(0x68),

    LMUL(0x69),

    FMUL(0x6a),

    DMUL(0x6b),

    IDIV(0x6c),

    LDIV(0x6d),

    FDIV(0x6e),

    DDIV(0x6f),

    IREM(0x70),

    LREM(0x71),

    FREM(0x72),

    DREM(0x73),

    INEG(0x74),

    LNEG(0x75),

    FNEG(0x76),

    DNEG(0x77),

    ISHL(0x78),

    LSHL(0x79),

    ISHR(0x7a),

    LSHR(0x7b),

    IUSHR(0x7c),

    LUSHR(0x7d),

    IAND(0x7e),

    LAND(0x7f),

    IOR(0x80),

    LOR(0x81),

    IXOR(0x82),

    LXOR(0x83),

    IINC(0x84, LOCAL_BYTE),

    I2L(0x85),

    I2F(0x86),

    I2D(0x87),

    L2I(0x88),

    L2F(0x89),

    L2D(0x8a),

    F2I(0x8b),

    F2L(0x8c),

    F2D(0x8d),

    D2I(0x8e),

    D2L(0x8f),

    D2F(0x90),

    I2B(0x91),

    I2C(0x92),

    I2S(0x93),

    LCMP(0x94),

    FCMPL(0x95),

    FCMPG(0x96),

    DCMPL(0x97),

    DCMPG(0x98),

    IFEQ(0x99, BRANCH),

    IFNE(0x9a, BRANCH),

    IFLT(0x9b, BRANCH),

    IFGE(0x9c, BRANCH),

    IFGT(0x9d, BRANCH),

    IFLE(0x9e, BRANCH),

    IF_ICMPEQ(0x9f, BRANCH),

    IF_ICMPNE(0xa0, BRANCH),

    IF_ICMPLT(0xa1, BRANCH),

    IF_ICMPGE(0xa2, BRANCH),

    IF_ICMPGT(0xa3, BRANCH),

    IF_ICMPLE(0xa4, BRANCH),

    IF_ACMPEQ(0xa5, BRANCH),

    IF_ACMPNE(0xa6, BRANCH),

    GOTO(0xa7, BRANCH),

    JSR(0xa8, BRANCH),

    RET(0xa9, LOCAL),

    TABLESWITCH(0xaa, DYNAMIC),

    LOOKUPSWITCH(0xab, DYNAMIC),

    IRETURN(0xac),

    LRETURN(0xad),

    FRETURN(0xae),

    DRETURN(0xaf),

    ARETURN(0xb0),

    RETURN(0xb1),

    GETSTATIC(0xb2, CPREF_W),

    PUTSTATIC(0xb3, CPREF_W),

    GETFIELD(0xb4, CPREF_W),

    PUTFIELD(0xb5, CPREF_W),

    INVOKEVIRTUAL(0xb6, CPREF_W),

    INVOKESPECIAL(0xb7, CPREF_W),

    INVOKESTATIC(0xb8, CPREF_W),

    INVOKEINTERFACE(0xb9, CPREF_W_UBYTE_ZERO),

    INVOKEDYNAMIC(0xba, CPREF_W_UBYTE_ZERO),

    NEW(0xbb, CPREF_W),

    NEWARRAY(0xbc, ATYPE),

    ANEWARRAY(0xbd, CPREF_W),

    ARRAYLENGTH(0xbe),

    ATHROW(0xbf),

    CHECKCAST(0xc0, CPREF_W),

    INSTANCEOF(0xc1, CPREF_W),

    MONITORENTER(0xc2),

    MONITOREXIT(0xc3),

    // wide 0xc4

    MULTIANEWARRAY(0xc5, CPREF_W_UBYTE),

    IFNULL(0xc6, BRANCH),

    IFNONNULL(0xc7, BRANCH),

    GOTO_W(0xc8, BRANCH_W),

    JSR_W(0xc9, BRANCH_W),

    // impdep 0xfe: PicoJava nonpriv

    // impdep 0xff: Picojava priv

    // wide opcodes

    ILOAD_W(0xc415, WIDE_LOCAL),

    LLOAD_W(0xc416, WIDE_LOCAL),

    FLOAD_W(0xc417, WIDE_LOCAL),

    DLOAD_W(0xc418, WIDE_LOCAL),

    ALOAD_W(0xc419, WIDE_LOCAL),

    ISTORE_W(0xc436, WIDE_LOCAL),

    LSTORE_W(0xc437, WIDE_LOCAL),

    FSTORE_W(0xc438, WIDE_LOCAL),

    DSTORE_W(0xc439, WIDE_LOCAL),

    ASTORE_W(0xc43a, WIDE_LOCAL),

    IINC_W(0xc484, WIDE_LOCAL_SHORT),

    RET_W(0xc4a9, WIDE_LOCAL),

    // PicoJava nonpriv instructions

    LOAD_UBYTE(PICOJAVA, 0xfe00),

    LOAD_BYTE(PICOJAVA, 0xfe01),

    LOAD_CHAR(PICOJAVA, 0xfe02),

    LOAD_SHORT(PICOJAVA, 0xfe03),

    LOAD_WORD(PICOJAVA, 0xfe04),

    RET_FROM_SUB(PICOJAVA, 0xfe05),

    LOAD_CHAR_OE(PICOJAVA, 0xfe0a),

    LOAD_SHORT_OE(PICOJAVA, 0xfe0b),

    LOAD_WORD_OE(PICOJAVA, 0xfe0c),

    NCLOAD_UBYTE(PICOJAVA, 0xfe10),

    NCLOAD_BYTE(PICOJAVA, 0xfe11),

    NCLOAD_CHAR(PICOJAVA, 0xfe12),

    NCLOAD_SHORT(PICOJAVA, 0xfe13),

    NCLOAD_WORD(PICOJAVA, 0xfe14),

    NCLOAD_CHAR_OE(PICOJAVA, 0xfe1a),

    NCLOAD_SHORT_OE(PICOJAVA, 0xfe1b),

    NCLOAD_WORD_OE(PICOJAVA, 0xfe1c),

    CACHE_FLUSH(PICOJAVA, 0xfe1e),

    STORE_BYTE(PICOJAVA, 0xfe20),

    STORE_SHORT(PICOJAVA, 0xfe22),

    STORE_WORD(PICOJAVA, 0xfe24),

    STORE_SHORT_OE(PICOJAVA, 0xfe2a),

    STORE_WORD_OE(PICOJAVA, 0xfe2c),

    NCSTORE_BYTE(PICOJAVA, 0xfe30),

    NCSTORE_SHORT(PICOJAVA, 0xfe32),

    NCSTORE_WORD(PICOJAVA, 0xfe34),

    NCSTORE_SHORT_OE(PICOJAVA, 0xfe3a),

    NCSTORE_WORD_OE(PICOJAVA, 0xfe3c),

    ZERO_LINE(PICOJAVA, 0xfe3e),

    ENTER_SYNC_METHOD(PICOJAVA, 0xfe3f),

    // PicoJava priv instructions

    PRIV_LOAD_UBYTE(PICOJAVA, 0xff00),

    PRIV_LOAD_BYTE(PICOJAVA, 0xff01),

    PRIV_LOAD_CHAR(PICOJAVA, 0xff02),

    PRIV_LOAD_SHORT(PICOJAVA, 0xff03),

    PRIV_LOAD_WORD(PICOJAVA, 0xff04),

    PRIV_RET_FROM_TRAP(PICOJAVA, 0xff05),

    PRIV_READ_DCACHE_TAG(PICOJAVA, 0xff06),

    PRIV_READ_DCACHE_DATA(PICOJAVA, 0xff07),

    PRIV_LOAD_CHAR_OE(PICOJAVA, 0xff0a),

    PRIV_LOAD_SHORT_OE(PICOJAVA, 0xff0b),

    PRIV_LOAD_WORD_OE(PICOJAVA, 0xff0c),

    PRIV_READ_ICACHE_TAG(PICOJAVA, 0xff0e),

    PRIV_READ_ICACHE_DATA(PICOJAVA, 0xff0f),

    PRIV_NCLOAD_UBYTE(PICOJAVA, 0xff10),

    PRIV_NCLOAD_BYTE(PICOJAVA, 0xff11),

    PRIV_NCLOAD_CHAR(PICOJAVA, 0xff12),

    PRIV_NCLOAD_SHORT(PICOJAVA, 0xff13),

    PRIV_NCLOAD_WORD(PICOJAVA, 0xff14),

    PRIV_POWERDOWN(PICOJAVA, 0xff16),

    PRIV_READ_SCACHE_DATA(PICOJAVA, 0xff17),

    PRIV_NCLOAD_CHAR_OE(PICOJAVA, 0xff1a),

    PRIV_NCLOAD_SHORT_OE(PICOJAVA, 0xff1b),

    PRIV_NCLOAD_WORD_OE(PICOJAVA, 0xff1c),

    PRIV_CACHE_FLUSH(PICOJAVA, 0xff1e),

    PRIV_CACHE_INDEX_FLUSH(PICOJAVA, 0xff1f),

    PRIV_STORE_BYTE(PICOJAVA, 0xff20),

    PRIV_STORE_SHORT(PICOJAVA, 0xff22),

    PRIV_STORE_WORD(PICOJAVA, 0xff24),

    PRIV_WRITE_DCACHE_TAG(PICOJAVA, 0xff26),

    PRIV_WRITE_DCACHE_DATA(PICOJAVA, 0xff27),

    PRIV_STORE_SHORT_OE(PICOJAVA, 0xff2a),

    PRIV_STORE_WORD_OE(PICOJAVA, 0xff2c),

    PRIV_WRITE_ICACHE_TAG(PICOJAVA, 0xff2e),

    PRIV_WRITE_ICACHE_DATA(PICOJAVA, 0xff2f),

    PRIV_NCSTORE_BYTE(PICOJAVA, 0xff30),

    PRIV_NCSTORE_SHORT(PICOJAVA, 0xff32),

    PRIV_NCSTORE_WORD(PICOJAVA, 0xff34),

    PRIV_RESET(PICOJAVA, 0xff36),

    PRIV_WRITE_SCACHE_DATA(PICOJAVA, 0xff37),

    PRIV_NCSTORE_SHORT_OE(PICOJAVA, 0xff3a),

    PRIV_NCSTORE_WORD_OE(PICOJAVA, 0xff3c),

    PRIV_ZERO_LINE(PICOJAVA, 0xff3e),

    PRIV_READ_REG_0(PICOJAVA, 0xff40),

    PRIV_READ_REG_1(PICOJAVA, 0xff41),

    PRIV_READ_REG_2(PICOJAVA, 0xff42),

    PRIV_READ_REG_3(PICOJAVA, 0xff43),

    PRIV_READ_REG_4(PICOJAVA, 0xff44),

    PRIV_READ_REG_5(PICOJAVA, 0xff45),

    PRIV_READ_REG_6(PICOJAVA, 0xff46),

    PRIV_READ_REG_7(PICOJAVA, 0xff47),

    PRIV_READ_REG_8(PICOJAVA, 0xff48),

    PRIV_READ_REG_9(PICOJAVA, 0xff49),

    PRIV_READ_REG_10(PICOJAVA, 0xff4a),

    PRIV_READ_REG_11(PICOJAVA, 0xff4b),

    PRIV_READ_REG_12(PICOJAVA, 0xff4c),

    PRIV_READ_REG_13(PICOJAVA, 0xff4d),

    PRIV_READ_REG_14(PICOJAVA, 0xff4e),

    PRIV_READ_REG_15(PICOJAVA, 0xff4f),

    PRIV_READ_REG_16(PICOJAVA, 0xff50),

    PRIV_READ_REG_17(PICOJAVA, 0xff51),

    PRIV_READ_REG_18(PICOJAVA, 0xff52),

    PRIV_READ_REG_19(PICOJAVA, 0xff53),

    PRIV_READ_REG_20(PICOJAVA, 0xff54),

    PRIV_READ_REG_21(PICOJAVA, 0xff55),

    PRIV_READ_REG_22(PICOJAVA, 0xff56),

    PRIV_READ_REG_23(PICOJAVA, 0xff57),

    PRIV_READ_REG_24(PICOJAVA, 0xff58),

    PRIV_READ_REG_25(PICOJAVA, 0xff59),

    PRIV_READ_REG_26(PICOJAVA, 0xff5a),

    PRIV_READ_REG_27(PICOJAVA, 0xff5b),

    PRIV_READ_REG_28(PICOJAVA, 0xff5c),

    PRIV_READ_REG_29(PICOJAVA, 0xff5d),

    PRIV_READ_REG_30(PICOJAVA, 0xff5e),

    PRIV_READ_REG_31(PICOJAVA, 0xff5f),

    PRIV_WRITE_REG_0(PICOJAVA, 0xff60),

    PRIV_WRITE_REG_1(PICOJAVA, 0xff61),

    PRIV_WRITE_REG_2(PICOJAVA, 0xff62),

    PRIV_WRITE_REG_3(PICOJAVA, 0xff63),

    PRIV_WRITE_REG_4(PICOJAVA, 0xff64),

    PRIV_WRITE_REG_5(PICOJAVA, 0xff65),

    PRIV_WRITE_REG_6(PICOJAVA, 0xff66),

    PRIV_WRITE_REG_7(PICOJAVA, 0xff67),

    PRIV_WRITE_REG_8(PICOJAVA, 0xff68),

    PRIV_WRITE_REG_9(PICOJAVA, 0xff69),

    PRIV_WRITE_REG_10(PICOJAVA, 0xff6a),

    PRIV_WRITE_REG_11(PICOJAVA, 0xff6b),

    PRIV_WRITE_REG_12(PICOJAVA, 0xff6c),

    PRIV_WRITE_REG_13(PICOJAVA, 0xff6d),

    PRIV_WRITE_REG_14(PICOJAVA, 0xff6e),

    PRIV_WRITE_REG_15(PICOJAVA, 0xff6f),

    PRIV_WRITE_REG_16(PICOJAVA, 0xff70),

    PRIV_WRITE_REG_17(PICOJAVA, 0xff71),

    PRIV_WRITE_REG_18(PICOJAVA, 0xff72),

    PRIV_WRITE_REG_19(PICOJAVA, 0xff73),

    PRIV_WRITE_REG_20(PICOJAVA, 0xff74),

    PRIV_WRITE_REG_21(PICOJAVA, 0xff75),

    PRIV_WRITE_REG_22(PICOJAVA, 0xff76),

    PRIV_WRITE_REG_23(PICOJAVA, 0xff77),

    PRIV_WRITE_REG_24(PICOJAVA, 0xff78),

    PRIV_WRITE_REG_25(PICOJAVA, 0xff79),

    PRIV_WRITE_REG_26(PICOJAVA, 0xff7a),

    PRIV_WRITE_REG_27(PICOJAVA, 0xff7b),

    PRIV_WRITE_REG_28(PICOJAVA, 0xff7c),

    PRIV_WRITE_REG_29(PICOJAVA, 0xff7d),

    PRIV_WRITE_REG_30(PICOJAVA, 0xff7e),

    PRIV_WRITE_REG_31(PICOJAVA, 0xff7f);

    Opcode(int opcode) {

        this(STANDARD, opcode, NO_OPERANDS);

    }

    Opcode(int opcode, Instruction.Kind kind) {

        this(STANDARD, opcode, kind);

    }

    Opcode(Set set, int opcode) {

        this(set, opcode, (set == STANDARD ? NO_OPERANDS : WIDE_NO_OPERANDS));

    }

    Opcode(Set set, int opcode, Instruction.Kind kind) {

        this.set = set;

        this.opcode = opcode;

        this.kind = kind;

    }

    public final Set set;

    public final int opcode;

    public final Instruction.Kind kind;

    /** Get the Opcode for a simple standard 1-byte opcode. */

    public static Opcode get(int opcode) {

        return stdOpcodes[opcode];

    }

    /** Get the Opcode for 1- or 2-byte opcode. */

    public static Opcode get(int opcodePrefix, int opcode) {

        Opcode[] block = getOpcodeBlock(opcodePrefix);

        return (block == null ? null : block[opcode]);

    }

    private static Opcode[] getOpcodeBlock(int opcodePrefix) {

        switch (opcodePrefix) {

            case 0:

                return stdOpcodes;

            case WIDE:

                return wideOpcodes;

            case NONPRIV:

                return nonPrivOpcodes;

            case PRIV:

                return privOpcodes;

            default:

                return null;

        }

    }

    private static final Opcode[] stdOpcodes = new Opcode[256];

    private static final Opcode[] wideOpcodes = new Opcode[256];

    private static final Opcode[] nonPrivOpcodes = new Opcode[256];

    private static final Opcode[] privOpcodes = new Opcode[256];

    static {

        for (Opcode o: values())

            getOpcodeBlock(o.opcode >> 8)[o.opcode & 0xff] = o;

    }

    /** The byte prefix for the wide instructions. */

    public static final int WIDE = 0xc4;

    /** The byte prefix for the PicoJava nonpriv instructions. */

    public static final int NONPRIV = 0xfe;

    /** The byte prefix for the PicoJava priv instructions. */

    public static final int PRIV = 0xff;

    public enum Set {

        /** Standard opcodes. */

        STANDARD,

        /** Legacy support for PicoJava opcodes. */

        PICOJAVA  }

}