content: /*
   * 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 openjdk.tools.classfile;
  
  import static openjdk.tools.classfile.Instruction.Kind.*;
  import static openjdk.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  }
  }
  