/*

 * Copyright (c) 1997, 2010, 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.

 *

 * 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.

 *

 */

// Bytecodes specifies all bytecodes used in the VM and

// provides utility functions to get bytecode attributes.

// NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/interpreter/Bytecodes.java

class Bytecodes: AllStatic {

 public:

  enum Code {

    _illegal              =  -1,

    // Java bytecodes

    _nop                  =   0, // 0x00

    _aconst_null          =   1, // 0x01

    _iconst_m1            =   2, // 0x02

    _iconst_0             =   3, // 0x03

    _iconst_1             =   4, // 0x04

    _iconst_2             =   5, // 0x05

    _iconst_3             =   6, // 0x06

    _iconst_4             =   7, // 0x07

    _iconst_5             =   8, // 0x08

    _lconst_0             =   9, // 0x09

    _lconst_1             =  10, // 0x0a

    _fconst_0             =  11, // 0x0b

    _fconst_1             =  12, // 0x0c

    _fconst_2             =  13, // 0x0d

    _dconst_0             =  14, // 0x0e

    _dconst_1             =  15, // 0x0f

    _bipush               =  16, // 0x10

    _sipush               =  17, // 0x11

    _ldc                  =  18, // 0x12

    _ldc_w                =  19, // 0x13

    _ldc2_w               =  20, // 0x14

    _iload                =  21, // 0x15

    _lload                =  22, // 0x16

    _fload                =  23, // 0x17

    _dload                =  24, // 0x18

    _aload                =  25, // 0x19

    _iload_0              =  26, // 0x1a

    _iload_1              =  27, // 0x1b

    _iload_2              =  28, // 0x1c

    _iload_3              =  29, // 0x1d

    _lload_0              =  30, // 0x1e

    _lload_1              =  31, // 0x1f

    _lload_2              =  32, // 0x20

    _lload_3              =  33, // 0x21

    _fload_0              =  34, // 0x22

    _fload_1              =  35, // 0x23

    _fload_2              =  36, // 0x24

    _fload_3              =  37, // 0x25

    _dload_0              =  38, // 0x26

    _dload_1              =  39, // 0x27

    _dload_2              =  40, // 0x28

    _dload_3              =  41, // 0x29

    _aload_0              =  42, // 0x2a

    _aload_1              =  43, // 0x2b

    _aload_2              =  44, // 0x2c

    _aload_3              =  45, // 0x2d

    _iaload               =  46, // 0x2e

    _laload               =  47, // 0x2f

    _faload               =  48, // 0x30

    _daload               =  49, // 0x31

    _aaload               =  50, // 0x32

    _baload               =  51, // 0x33

    _caload               =  52, // 0x34

    _saload               =  53, // 0x35

    _istore               =  54, // 0x36

    _lstore               =  55, // 0x37

    _fstore               =  56, // 0x38

    _dstore               =  57, // 0x39

    _astore               =  58, // 0x3a

    _istore_0             =  59, // 0x3b

    _istore_1             =  60, // 0x3c

    _istore_2             =  61, // 0x3d

    _istore_3             =  62, // 0x3e

    _lstore_0             =  63, // 0x3f

    _lstore_1             =  64, // 0x40

    _lstore_2             =  65, // 0x41

    _lstore_3             =  66, // 0x42

    _fstore_0             =  67, // 0x43

    _fstore_1             =  68, // 0x44

    _fstore_2             =  69, // 0x45

    _fstore_3             =  70, // 0x46

    _dstore_0             =  71, // 0x47

    _dstore_1             =  72, // 0x48

    _dstore_2             =  73, // 0x49

    _dstore_3             =  74, // 0x4a

    _astore_0             =  75, // 0x4b

    _astore_1             =  76, // 0x4c

    _astore_2             =  77, // 0x4d

    _astore_3             =  78, // 0x4e

    _iastore              =  79, // 0x4f

    _lastore              =  80, // 0x50

    _fastore              =  81, // 0x51

    _dastore              =  82, // 0x52

    _aastore              =  83, // 0x53

    _bastore              =  84, // 0x54

    _castore              =  85, // 0x55

    _sastore              =  86, // 0x56

    _pop                  =  87, // 0x57

    _pop2                 =  88, // 0x58

    _dup                  =  89, // 0x59

    _dup_x1               =  90, // 0x5a

    _dup_x2               =  91, // 0x5b

    _dup2                 =  92, // 0x5c

    _dup2_x1              =  93, // 0x5d

    _dup2_x2              =  94, // 0x5e

    _swap                 =  95, // 0x5f

    _iadd                 =  96, // 0x60

    _ladd                 =  97, // 0x61

    _fadd                 =  98, // 0x62

    _dadd                 =  99, // 0x63

    _isub                 = 100, // 0x64

    _lsub                 = 101, // 0x65

    _fsub                 = 102, // 0x66

    _dsub                 = 103, // 0x67

    _imul                 = 104, // 0x68

    _lmul                 = 105, // 0x69

    _fmul                 = 106, // 0x6a

    _dmul                 = 107, // 0x6b

    _idiv                 = 108, // 0x6c

    _ldiv                 = 109, // 0x6d

    _fdiv                 = 110, // 0x6e

    _ddiv                 = 111, // 0x6f

    _irem                 = 112, // 0x70

    _lrem                 = 113, // 0x71

    _frem                 = 114, // 0x72

    _drem                 = 115, // 0x73

    _ineg                 = 116, // 0x74

    _lneg                 = 117, // 0x75

    _fneg                 = 118, // 0x76

    _dneg                 = 119, // 0x77

    _ishl                 = 120, // 0x78

    _lshl                 = 121, // 0x79

    _ishr                 = 122, // 0x7a

    _lshr                 = 123, // 0x7b

    _iushr                = 124, // 0x7c

    _lushr                = 125, // 0x7d

    _iand                 = 126, // 0x7e

    _land                 = 127, // 0x7f

    _ior                  = 128, // 0x80

    _lor                  = 129, // 0x81

    _ixor                 = 130, // 0x82

    _lxor                 = 131, // 0x83

    _iinc                 = 132, // 0x84

    _i2l                  = 133, // 0x85

    _i2f                  = 134, // 0x86

    _i2d                  = 135, // 0x87

    _l2i                  = 136, // 0x88

    _l2f                  = 137, // 0x89

    _l2d                  = 138, // 0x8a

    _f2i                  = 139, // 0x8b

    _f2l                  = 140, // 0x8c

    _f2d                  = 141, // 0x8d

    _d2i                  = 142, // 0x8e

    _d2l                  = 143, // 0x8f

    _d2f                  = 144, // 0x90

    _i2b                  = 145, // 0x91

    _i2c                  = 146, // 0x92

    _i2s                  = 147, // 0x93

    _lcmp                 = 148, // 0x94

    _fcmpl                = 149, // 0x95

    _fcmpg                = 150, // 0x96

    _dcmpl                = 151, // 0x97

    _dcmpg                = 152, // 0x98

    _ifeq                 = 153, // 0x99

    _ifne                 = 154, // 0x9a

    _iflt                 = 155, // 0x9b

    _ifge                 = 156, // 0x9c

    _ifgt                 = 157, // 0x9d

    _ifle                 = 158, // 0x9e

    _if_icmpeq            = 159, // 0x9f

    _if_icmpne            = 160, // 0xa0

    _if_icmplt            = 161, // 0xa1

    _if_icmpge            = 162, // 0xa2

    _if_icmpgt            = 163, // 0xa3

    _if_icmple            = 164, // 0xa4

    _if_acmpeq            = 165, // 0xa5

    _if_acmpne            = 166, // 0xa6

    _goto                 = 167, // 0xa7

    _jsr                  = 168, // 0xa8

    _ret                  = 169, // 0xa9

    _tableswitch          = 170, // 0xaa

    _lookupswitch         = 171, // 0xab

    _ireturn              = 172, // 0xac

    _lreturn              = 173, // 0xad

    _freturn              = 174, // 0xae

    _dreturn              = 175, // 0xaf

    _areturn              = 176, // 0xb0

    _return               = 177, // 0xb1

    _getstatic            = 178, // 0xb2

    _putstatic            = 179, // 0xb3

    _getfield             = 180, // 0xb4

    _putfield             = 181, // 0xb5

    _invokevirtual        = 182, // 0xb6

    _invokespecial        = 183, // 0xb7

    _invokestatic         = 184, // 0xb8

    _invokeinterface      = 185, // 0xb9

    _invokedynamic        = 186, // 0xba     // if EnableInvokeDynamic

    _new                  = 187, // 0xbb

    _newarray             = 188, // 0xbc

    _anewarray            = 189, // 0xbd

    _arraylength          = 190, // 0xbe

    _athrow               = 191, // 0xbf

    _checkcast            = 192, // 0xc0

    _instanceof           = 193, // 0xc1

    _monitorenter         = 194, // 0xc2

    _monitorexit          = 195, // 0xc3

    _wide                 = 196, // 0xc4

    _multianewarray       = 197, // 0xc5

    _ifnull               = 198, // 0xc6

    _ifnonnull            = 199, // 0xc7

    _goto_w               = 200, // 0xc8

    _jsr_w                = 201, // 0xc9

    _breakpoint           = 202, // 0xca

    number_of_java_codes,

    // JVM bytecodes

    _fast_agetfield       = number_of_java_codes,

    _fast_bgetfield       ,

    _fast_cgetfield       ,

    _fast_dgetfield       ,

    _fast_fgetfield       ,

    _fast_igetfield       ,

    _fast_lgetfield       ,

    _fast_sgetfield       ,

    _fast_aputfield       ,

    _fast_bputfield       ,

    _fast_cputfield       ,

    _fast_dputfield       ,

    _fast_fputfield       ,

    _fast_iputfield       ,

    _fast_lputfield       ,

    _fast_sputfield       ,

    _fast_aload_0         ,

    _fast_iaccess_0       ,

    _fast_aaccess_0       ,

    _fast_faccess_0       ,

    _fast_iload           ,

    _fast_iload2          ,

    _fast_icaload         ,

    _fast_invokevfinal    ,

    _fast_linearswitch    ,

    _fast_binaryswitch    ,

    _return_register_finalizer    ,

    _shouldnotreachhere,      // For debugging

    // Platform specific JVM bytecodes

    #include "incls/_bytecodes_pd.hpp.incl"

    number_of_codes

  };

  // Flag bits derived from format strings, can_trap, can_rewrite, etc.:

  enum Flags {

    // semantic flags:

    _bc_can_trap      = 1<<0,     // bytecode execution can trap or block

    _bc_can_rewrite   = 1<<1,     // bytecode execution has an alternate form

    // format bits (determined only by the format string):

    _fmt_has_c        = 1<<2,     // constant, such as sipush "bcc"

    _fmt_has_j        = 1<<3,     // constant pool cache index, such as getfield "bjj"

    _fmt_has_k        = 1<<4,     // constant pool index, such as ldc "bk"

    _fmt_has_i        = 1<<5,     // local index, such as iload

    _fmt_has_o        = 1<<6,     // offset, such as ifeq

    _fmt_has_nbo      = 1<<7,     // contains native-order field(s)

    _fmt_has_u2       = 1<<8,     // contains double-byte field(s)

    _fmt_has_u4       = 1<<9,     // contains quad-byte field

    _fmt_not_variable = 1<<10,    // not of variable length (simple or wide)

    _fmt_not_simple   = 1<<11,    // either wide or variable length

    _all_fmt_bits     = (_fmt_not_simple*2 - _fmt_has_c),

    // Example derived format syndromes:

    _fmt_b      = _fmt_not_variable,

    _fmt_bc     = _fmt_b | _fmt_has_c,

    _fmt_bi     = _fmt_b | _fmt_has_i,

    _fmt_bkk    = _fmt_b | _fmt_has_k | _fmt_has_u2,

    _fmt_bJJ    = _fmt_b | _fmt_has_j | _fmt_has_u2 | _fmt_has_nbo,

    _fmt_bo2    = _fmt_b | _fmt_has_o | _fmt_has_u2,

    _fmt_bo4    = _fmt_b | _fmt_has_o | _fmt_has_u4

  };

 private:

  static bool        _is_initialized;

  static const char* _name          [number_of_codes];

  static BasicType   _result_type   [number_of_codes];

  static s_char      _depth         [number_of_codes];

  static u_char      _lengths       [number_of_codes];

  static Code        _java_code     [number_of_codes];

  static jchar       _flags         [(1<<BitsPerByte)*2]; // all second page for wide formats

  static void        def(Code code, const char* name, const char* format, const char* wide_format, BasicType result_type, int depth, bool can_trap);

  static void        def(Code code, const char* name, const char* format, const char* wide_format, BasicType result_type, int depth, bool can_trap, Code java_code);

  static void        pd_initialize();              // platform specific initialization

  static Code        pd_base_code_for(Code code);  // platform specific base_code_for implementation

 public:

  // Conversion

  static void        check          (Code code)    { assert(is_defined(code), "illegal code"); }

  static void        wide_check     (Code code)    { assert(wide_is_defined(code), "illegal code"); }

  static Code        cast           (int  code)    { return (Code)code; }

   // Fetch a bytecode, hiding breakpoints as necessary:

   static Code       code_at(address bcp, methodOop method = NULL) {

          Code code = cast(*bcp); return (code != _breakpoint) ? code : non_breakpoint_code_at(bcp, method);

   }

   static Code       java_code_at(address bcp, methodOop method = NULL) {

          return java_code(code_at(bcp, method));

   }

   // Fetch a bytecode or a breakpoint:

   static Code       code_or_bp_at(address bcp)    { return (Code)cast(*bcp); }

   static Code       code_at(methodOop method, int bci);

   static bool       is_active_breakpoint_at(address bcp) { return (Code)*bcp == _breakpoint; }

   // find a bytecode, behind a breakpoint if necessary:

   static Code       non_breakpoint_code_at(address bcp, methodOop method = NULL);

  // Bytecode attributes

  static bool        is_defined     (int  code)    { return 0 <= code && code < number_of_codes && flags(code, false) != 0; }

  static bool        wide_is_defined(int  code)    { return is_defined(code) && flags(code, true) != 0; }

  static const char* name           (Code code)    { check(code);      return _name          [code]; }

  static BasicType   result_type    (Code code)    { check(code);      return _result_type   [code]; }

  static int         depth          (Code code)    { check(code);      return _depth         [code]; }

  // Note: Length functions must return <=0 for invalid bytecodes.

  // Calling check(code) in length functions would throw an unwanted assert.

  static int         length_for     (Code code)    { /*no check*/      return _lengths       [code] & 0xF; }

  static int         wide_length_for(Code code)    { /*no check*/      return _lengths       [code] >> 4; }

  static bool        can_trap       (Code code)    { check(code);      return has_all_flags(code, _bc_can_trap, false); }

  static Code        java_code      (Code code)    { check(code);      return _java_code     [code]; }

  static bool        can_rewrite    (Code code)    { check(code);      return has_all_flags(code, _bc_can_rewrite, false); }

  static bool        native_byte_order(Code code)  { check(code);      return has_all_flags(code, _fmt_has_nbo, false); }

  static bool        uses_cp_cache  (Code code)    { check(code);      return has_all_flags(code, _fmt_has_j, false); }

  // if 'end' is provided, it indicates the end of the code buffer which

  // should not be read past when parsing.

  static int         special_length_at(address bcp, address end = NULL);

  static int         raw_special_length_at(address bcp, address end = NULL);

  static int         length_at      (address bcp)  { int l = length_for(code_at(bcp)); return l > 0 ? l : special_length_at(bcp); }

  static int         java_length_at (address bcp)  { int l = length_for(java_code_at(bcp)); return l > 0 ? l : special_length_at(bcp); }

  static bool        is_java_code   (Code code)    { return 0 <= code && code < number_of_java_codes; }

  static bool        is_aload       (Code code)    { return (code == _aload  || code == _aload_0  || code == _aload_1

                                                                             || code == _aload_2  || code == _aload_3); }

  static bool        is_astore      (Code code)    { return (code == _astore || code == _astore_0 || code == _astore_1

                                                                             || code == _astore_2 || code == _astore_3); }

  static bool        is_zero_const  (Code code)    { return (code == _aconst_null || code == _iconst_0

                                                           || code == _fconst_0 || code == _dconst_0); }

  static int         compute_flags  (const char* format, int more_flags = 0);  // compute the flags

  static int         flags          (int code, bool is_wide) {

    assert(code == (u_char)code, "must be a byte");

    return _flags[code + (is_wide ? (1<<BitsPerByte) : 0)];

  }

  static int         format_bits    (Code code, bool is_wide) { return flags(code, is_wide) & _all_fmt_bits; }

  static bool        has_all_flags  (Code code, int test_flags, bool is_wide) {

    return (flags(code, is_wide) & test_flags) == test_flags;

  }

  // Initialization

  static void        initialize     ();

};