1 /*
   2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "interpreter/bytecodes.hpp"
  27 #include "memory/resourceArea.hpp"
  28 #include "oops/method.hpp"
  29 #include "utilities/bytes.hpp"
  30 
  31 
  32 #if defined(WIN32) && (defined(_MSC_VER) && (_MSC_VER < 1600))
  33 // Windows AMD64 Compiler Hangs compiling this file
  34 // unless optimization is off
  35 #ifdef _M_AMD64
  36 #pragma optimize ("", off)
  37 #endif
  38 #endif
  39 
  40 
  41 bool            Bytecodes::_is_initialized = false;
  42 const char*     Bytecodes::_name          [Bytecodes::number_of_codes];
  43 BasicType       Bytecodes::_result_type   [Bytecodes::number_of_codes];
  44 s_char          Bytecodes::_depth         [Bytecodes::number_of_codes];
  45 u_char          Bytecodes::_lengths       [Bytecodes::number_of_codes];
  46 Bytecodes::Code Bytecodes::_java_code     [Bytecodes::number_of_codes];
  47 u_short         Bytecodes::_flags         [(1<<BitsPerByte)*2];
  48 
  49 #ifdef ASSERT
  50 bool Bytecodes::check_method(const Method* method, address bcp) {
  51   return method->contains(bcp);
  52 }
  53 #endif
  54 
  55 bool Bytecodes::check_must_rewrite(Bytecodes::Code code) {
  56   assert(can_rewrite(code), "post-check only");
  57 
  58   // Some codes are conditionally rewriting.  Look closely at them.
  59   switch (code) {
  60   case Bytecodes::_aload_0:
  61     // Even if RewriteFrequentPairs is turned on,
  62     // the _aload_0 code might delay its rewrite until
  63     // a following _getfield rewrites itself.
  64     return false;
  65 
  66   case Bytecodes::_lookupswitch:
  67     return false;  // the rewrite is not done by the interpreter
  68 
  69   case Bytecodes::_new:
  70     // (Could actually look at the class here, but the profit would be small.)
  71     return false;  // the rewrite is not always done
  72   }
  73 
  74   // No other special cases.
  75   return true;
  76 }
  77 
  78 Bytecodes::Code Bytecodes::code_at(Method* method, int bci) {
  79   return code_at(method, method->bcp_from(bci));
  80 }
  81 
  82 Bytecodes::Code Bytecodes::non_breakpoint_code_at(const Method* method, address bcp) {
  83   assert(method != NULL, "must have the method for breakpoint conversion");
  84   assert(method->contains(bcp), "must be valid bcp in method");
  85   return method->orig_bytecode_at(method->bci_from(bcp));
  86 }
  87 
  88 int Bytecodes::special_length_at(Bytecodes::Code code, address bcp, address end) {
  89   switch (code) {
  90   case _wide:
  91     if (end != NULL && bcp + 1 >= end) {
  92       return -1; // don't read past end of code buffer
  93     }
  94     return wide_length_for(cast(*(bcp + 1)));
  95   case _tableswitch:
  96     { address aligned_bcp = (address)round_to((intptr_t)bcp + 1, jintSize);
  97       if (end != NULL && aligned_bcp + 3*jintSize >= end) {
  98         return -1; // don't read past end of code buffer
  99       }
 100       jlong lo = (jint)Bytes::get_Java_u4(aligned_bcp + 1*jintSize);
 101       jlong hi = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
 102       jlong len = (aligned_bcp - bcp) + (3 + hi - lo + 1)*jintSize;
 103       // only return len if it can be represented as a positive int;
 104       // return -1 otherwise
 105       return (len > 0 && len == (int)len) ? len : -1;
 106     }
 107 
 108   case _lookupswitch:      // fall through
 109   case _fast_binaryswitch: // fall through
 110   case _fast_linearswitch:
 111     { address aligned_bcp = (address)round_to((intptr_t)bcp + 1, jintSize);
 112       if (end != NULL && aligned_bcp + 2*jintSize >= end) {
 113         return -1; // don't read past end of code buffer
 114       }
 115       jlong npairs = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
 116       jlong len = (aligned_bcp - bcp) + (2 + 2*npairs)*jintSize;
 117       // only return len if it can be represented as a positive int;
 118       // return -1 otherwise
 119       return (len > 0 && len == (int)len) ? len : -1;
 120     }
 121   }
 122   // Note: Length functions must return <=0 for invalid bytecodes.
 123   return 0;
 124 }
 125 
 126 // At a breakpoint instruction, this returns the breakpoint's length,
 127 // otherwise, it's the same as special_length_at().  This is used by
 128 // the RawByteCodeStream, which wants to see the actual bytecode
 129 // values (including breakpoint).  RawByteCodeStream is used by the
 130 // verifier when reading in bytecode to verify.  Other mechanisms that
 131 // run at runtime (such as generateOopMaps) need to iterate over the code
 132 // and don't expect to see breakpoints: they want to see the instruction
 133 // which was replaced so that they can get the correct length and find
 134 // the next bytecode.
 135 //
 136 // 'end' indicates the end of the code buffer, which we should not try to read
 137 // past.
 138 int Bytecodes::raw_special_length_at(address bcp, address end) {
 139   Code code = code_or_bp_at(bcp);
 140   if (code == _breakpoint) {
 141     return 1;
 142   } else {
 143     return special_length_at(code, bcp, end);
 144   }
 145 }
 146 
 147 
 148 
 149 void Bytecodes::def(Code code, const char* name, const char* format, const char* wide_format, BasicType result_type, int depth, bool can_trap) {
 150   def(code, name, format, wide_format, result_type, depth, can_trap, code);
 151 }
 152 
 153 
 154 void Bytecodes::def(Code code, const char* name, const char* format, const char* wide_format, BasicType result_type, int depth, bool can_trap, Code java_code) {
 155   assert(wide_format == NULL || format != NULL, "short form must exist if there's a wide form");
 156   int len  = (format      != NULL ? (int) strlen(format)      : 0);
 157   int wlen = (wide_format != NULL ? (int) strlen(wide_format) : 0);
 158   _name          [code] = name;
 159   _result_type   [code] = result_type;
 160   _depth         [code] = depth;
 161   _lengths       [code] = (wlen << 4) | (len & 0xF);
 162   _java_code     [code] = java_code;
 163   int bc_flags = 0;
 164   if (can_trap)           bc_flags |= _bc_can_trap;
 165   if (java_code != code)  bc_flags |= _bc_can_rewrite;
 166   _flags[(u1)code+0*(1<<BitsPerByte)] = compute_flags(format,      bc_flags);
 167   _flags[(u1)code+1*(1<<BitsPerByte)] = compute_flags(wide_format, bc_flags);
 168   assert(is_defined(code)      == (format != NULL),      "");
 169   assert(wide_is_defined(code) == (wide_format != NULL), "");
 170   assert(length_for(code)      == len, "");
 171   assert(wide_length_for(code) == wlen, "");
 172 }
 173 
 174 
 175 // Format strings interpretation:
 176 //
 177 // b: bytecode
 178 // c: signed constant, Java byte-ordering
 179 // i: unsigned local index, Java byte-ordering (I = native byte ordering)
 180 // j: unsigned CP cache index, Java byte-ordering (J = native byte ordering)
 181 // k: unsigned CP index, Java byte-ordering
 182 // o: branch offset, Java byte-ordering
 183 // _: unused/ignored
 184 // w: wide bytecode
 185 //
 186 // Note: The format strings are used for 2 purposes:
 187 //       1. to specify the length of the bytecode
 188 //          (= number of characters in format string)
 189 //       2. to derive bytecode format flags (_fmt_has_k, etc.)
 190 //
 191 // Note: For bytecodes with variable length, the format string is the empty string.
 192 
 193 int Bytecodes::compute_flags(const char* format, int more_flags) {
 194   if (format == NULL)  return 0;  // not even more_flags
 195   int flags = more_flags;
 196   const char* fp = format;
 197   switch (*fp) {
 198   case '\0':
 199     flags |= _fmt_not_simple; // but variable
 200     break;
 201   case 'b':
 202     flags |= _fmt_not_variable;  // but simple
 203     ++fp;  // skip 'b'
 204     break;
 205   case 'w':
 206     flags |= _fmt_not_variable | _fmt_not_simple;
 207     ++fp;  // skip 'w'
 208     guarantee(*fp == 'b', "wide format must start with 'wb'");
 209     ++fp;  // skip 'b'
 210     break;
 211   }
 212 
 213   int has_nbo = 0, has_jbo = 0, has_size = 0;
 214   for (;;) {
 215     int this_flag = 0;
 216     char fc = *fp++;
 217     switch (fc) {
 218     case '\0':  // end of string
 219       assert(flags == (jchar)flags, "change _format_flags");
 220       return flags;
 221 
 222     case '_': continue;         // ignore these
 223 
 224     case 'j': this_flag = _fmt_has_j; has_jbo = 1; break;
 225     case 'k': this_flag = _fmt_has_k; has_jbo = 1; break;
 226     case 'i': this_flag = _fmt_has_i; has_jbo = 1; break;
 227     case 'c': this_flag = _fmt_has_c; has_jbo = 1; break;
 228     case 'o': this_flag = _fmt_has_o; has_jbo = 1; break;
 229 
 230     // uppercase versions mark native byte order (from Rewriter)
 231     // actually, only the 'J' case happens currently
 232     case 'J': this_flag = _fmt_has_j; has_nbo = 1; break;
 233     case 'K': this_flag = _fmt_has_k; has_nbo = 1; break;
 234     case 'I': this_flag = _fmt_has_i; has_nbo = 1; break;
 235     case 'C': this_flag = _fmt_has_c; has_nbo = 1; break;
 236     case 'O': this_flag = _fmt_has_o; has_nbo = 1; break;
 237     default:  guarantee(false, "bad char in format");
 238     }
 239 
 240     flags |= this_flag;
 241 
 242     guarantee(!(has_jbo && has_nbo), "mixed byte orders in format");
 243     if (has_nbo)
 244       flags |= _fmt_has_nbo;
 245 
 246     int this_size = 1;
 247     if (*fp == fc) {
 248       // advance beyond run of the same characters
 249       this_size = 2;
 250       while (*++fp == fc)  this_size++;
 251       switch (this_size) {
 252       case 2: flags |= _fmt_has_u2; break;
 253       case 4: flags |= _fmt_has_u4; break;
 254       default: guarantee(false, "bad rep count in format");
 255       }
 256     }
 257     guarantee(has_size == 0 ||                     // no field yet
 258               this_size == has_size ||             // same size
 259               this_size < has_size && *fp == '\0', // last field can be short
 260               "mixed field sizes in format");
 261     has_size = this_size;
 262   }
 263 }
 264 
 265 void Bytecodes::initialize() {
 266   if (_is_initialized) return;
 267   assert(number_of_codes <= 256, "too many bytecodes");
 268 
 269   // initialize bytecode tables - didn't use static array initializers
 270   // (such as {}) so we can do additional consistency checks and init-
 271   // code is independent of actual bytecode numbering.
 272   //
 273   // Note 1: NULL for the format string means the bytecode doesn't exist
 274   //         in that form.
 275   //
 276   // Note 2: The result type is T_ILLEGAL for bytecodes where the top of stack
 277   //         type after execution is not only determined by the bytecode itself.
 278 
 279   //  Java bytecodes
 280   //  bytecode               bytecode name           format   wide f.   result tp  stk traps
 281   def(_nop                 , "nop"                 , "b"    , NULL    , T_VOID   ,  0, false);
 282   def(_aconst_null         , "aconst_null"         , "b"    , NULL    , T_OBJECT ,  1, false);
 283   def(_iconst_m1           , "iconst_m1"           , "b"    , NULL    , T_INT    ,  1, false);
 284   def(_iconst_0            , "iconst_0"            , "b"    , NULL    , T_INT    ,  1, false);
 285   def(_iconst_1            , "iconst_1"            , "b"    , NULL    , T_INT    ,  1, false);
 286   def(_iconst_2            , "iconst_2"            , "b"    , NULL    , T_INT    ,  1, false);
 287   def(_iconst_3            , "iconst_3"            , "b"    , NULL    , T_INT    ,  1, false);
 288   def(_iconst_4            , "iconst_4"            , "b"    , NULL    , T_INT    ,  1, false);
 289   def(_iconst_5            , "iconst_5"            , "b"    , NULL    , T_INT    ,  1, false);
 290   def(_lconst_0            , "lconst_0"            , "b"    , NULL    , T_LONG   ,  2, false);
 291   def(_lconst_1            , "lconst_1"            , "b"    , NULL    , T_LONG   ,  2, false);
 292   def(_fconst_0            , "fconst_0"            , "b"    , NULL    , T_FLOAT  ,  1, false);
 293   def(_fconst_1            , "fconst_1"            , "b"    , NULL    , T_FLOAT  ,  1, false);
 294   def(_fconst_2            , "fconst_2"            , "b"    , NULL    , T_FLOAT  ,  1, false);
 295   def(_dconst_0            , "dconst_0"            , "b"    , NULL    , T_DOUBLE ,  2, false);
 296   def(_dconst_1            , "dconst_1"            , "b"    , NULL    , T_DOUBLE ,  2, false);
 297   def(_bipush              , "bipush"              , "bc"   , NULL    , T_INT    ,  1, false);
 298   def(_sipush              , "sipush"              , "bcc"  , NULL    , T_INT    ,  1, false);
 299   def(_ldc                 , "ldc"                 , "bk"   , NULL    , T_ILLEGAL,  1, true );
 300   def(_ldc_w               , "ldc_w"               , "bkk"  , NULL    , T_ILLEGAL,  1, true );
 301   def(_ldc2_w              , "ldc2_w"              , "bkk"  , NULL    , T_ILLEGAL,  2, true );
 302   def(_iload               , "iload"               , "bi"   , "wbii"  , T_INT    ,  1, false);
 303   def(_lload               , "lload"               , "bi"   , "wbii"  , T_LONG   ,  2, false);
 304   def(_fload               , "fload"               , "bi"   , "wbii"  , T_FLOAT  ,  1, false);
 305   def(_dload               , "dload"               , "bi"   , "wbii"  , T_DOUBLE ,  2, false);
 306   def(_aload               , "aload"               , "bi"   , "wbii"  , T_OBJECT ,  1, false);
 307   def(_iload_0             , "iload_0"             , "b"    , NULL    , T_INT    ,  1, false);
 308   def(_iload_1             , "iload_1"             , "b"    , NULL    , T_INT    ,  1, false);
 309   def(_iload_2             , "iload_2"             , "b"    , NULL    , T_INT    ,  1, false);
 310   def(_iload_3             , "iload_3"             , "b"    , NULL    , T_INT    ,  1, false);
 311   def(_lload_0             , "lload_0"             , "b"    , NULL    , T_LONG   ,  2, false);
 312   def(_lload_1             , "lload_1"             , "b"    , NULL    , T_LONG   ,  2, false);
 313   def(_lload_2             , "lload_2"             , "b"    , NULL    , T_LONG   ,  2, false);
 314   def(_lload_3             , "lload_3"             , "b"    , NULL    , T_LONG   ,  2, false);
 315   def(_fload_0             , "fload_0"             , "b"    , NULL    , T_FLOAT  ,  1, false);
 316   def(_fload_1             , "fload_1"             , "b"    , NULL    , T_FLOAT  ,  1, false);
 317   def(_fload_2             , "fload_2"             , "b"    , NULL    , T_FLOAT  ,  1, false);
 318   def(_fload_3             , "fload_3"             , "b"    , NULL    , T_FLOAT  ,  1, false);
 319   def(_dload_0             , "dload_0"             , "b"    , NULL    , T_DOUBLE ,  2, false);
 320   def(_dload_1             , "dload_1"             , "b"    , NULL    , T_DOUBLE ,  2, false);
 321   def(_dload_2             , "dload_2"             , "b"    , NULL    , T_DOUBLE ,  2, false);
 322   def(_dload_3             , "dload_3"             , "b"    , NULL    , T_DOUBLE ,  2, false);
 323   def(_aload_0             , "aload_0"             , "b"    , NULL    , T_OBJECT ,  1, true ); // rewriting in interpreter
 324   def(_aload_1             , "aload_1"             , "b"    , NULL    , T_OBJECT ,  1, false);
 325   def(_aload_2             , "aload_2"             , "b"    , NULL    , T_OBJECT ,  1, false);
 326   def(_aload_3             , "aload_3"             , "b"    , NULL    , T_OBJECT ,  1, false);
 327   def(_iaload              , "iaload"              , "b"    , NULL    , T_INT    , -1, true );
 328   def(_laload              , "laload"              , "b"    , NULL    , T_LONG   ,  0, true );
 329   def(_faload              , "faload"              , "b"    , NULL    , T_FLOAT  , -1, true );
 330   def(_daload              , "daload"              , "b"    , NULL    , T_DOUBLE ,  0, true );
 331   def(_aaload              , "aaload"              , "b"    , NULL    , T_OBJECT , -1, true );
 332   def(_baload              , "baload"              , "b"    , NULL    , T_INT    , -1, true );
 333   def(_caload              , "caload"              , "b"    , NULL    , T_INT    , -1, true );
 334   def(_saload              , "saload"              , "b"    , NULL    , T_INT    , -1, true );
 335   def(_istore              , "istore"              , "bi"   , "wbii"  , T_VOID   , -1, false);
 336   def(_lstore              , "lstore"              , "bi"   , "wbii"  , T_VOID   , -2, false);
 337   def(_fstore              , "fstore"              , "bi"   , "wbii"  , T_VOID   , -1, false);
 338   def(_dstore              , "dstore"              , "bi"   , "wbii"  , T_VOID   , -2, false);
 339   def(_astore              , "astore"              , "bi"   , "wbii"  , T_VOID   , -1, false);
 340   def(_istore_0            , "istore_0"            , "b"    , NULL    , T_VOID   , -1, false);
 341   def(_istore_1            , "istore_1"            , "b"    , NULL    , T_VOID   , -1, false);
 342   def(_istore_2            , "istore_2"            , "b"    , NULL    , T_VOID   , -1, false);
 343   def(_istore_3            , "istore_3"            , "b"    , NULL    , T_VOID   , -1, false);
 344   def(_lstore_0            , "lstore_0"            , "b"    , NULL    , T_VOID   , -2, false);
 345   def(_lstore_1            , "lstore_1"            , "b"    , NULL    , T_VOID   , -2, false);
 346   def(_lstore_2            , "lstore_2"            , "b"    , NULL    , T_VOID   , -2, false);
 347   def(_lstore_3            , "lstore_3"            , "b"    , NULL    , T_VOID   , -2, false);
 348   def(_fstore_0            , "fstore_0"            , "b"    , NULL    , T_VOID   , -1, false);
 349   def(_fstore_1            , "fstore_1"            , "b"    , NULL    , T_VOID   , -1, false);
 350   def(_fstore_2            , "fstore_2"            , "b"    , NULL    , T_VOID   , -1, false);
 351   def(_fstore_3            , "fstore_3"            , "b"    , NULL    , T_VOID   , -1, false);
 352   def(_dstore_0            , "dstore_0"            , "b"    , NULL    , T_VOID   , -2, false);
 353   def(_dstore_1            , "dstore_1"            , "b"    , NULL    , T_VOID   , -2, false);
 354   def(_dstore_2            , "dstore_2"            , "b"    , NULL    , T_VOID   , -2, false);
 355   def(_dstore_3            , "dstore_3"            , "b"    , NULL    , T_VOID   , -2, false);
 356   def(_astore_0            , "astore_0"            , "b"    , NULL    , T_VOID   , -1, false);
 357   def(_astore_1            , "astore_1"            , "b"    , NULL    , T_VOID   , -1, false);
 358   def(_astore_2            , "astore_2"            , "b"    , NULL    , T_VOID   , -1, false);
 359   def(_astore_3            , "astore_3"            , "b"    , NULL    , T_VOID   , -1, false);
 360   def(_iastore             , "iastore"             , "b"    , NULL    , T_VOID   , -3, true );
 361   def(_lastore             , "lastore"             , "b"    , NULL    , T_VOID   , -4, true );
 362   def(_fastore             , "fastore"             , "b"    , NULL    , T_VOID   , -3, true );
 363   def(_dastore             , "dastore"             , "b"    , NULL    , T_VOID   , -4, true );
 364   def(_aastore             , "aastore"             , "b"    , NULL    , T_VOID   , -3, true );
 365   def(_bastore             , "bastore"             , "b"    , NULL    , T_VOID   , -3, true );
 366   def(_castore             , "castore"             , "b"    , NULL    , T_VOID   , -3, true );
 367   def(_sastore             , "sastore"             , "b"    , NULL    , T_VOID   , -3, true );
 368   def(_pop                 , "pop"                 , "b"    , NULL    , T_VOID   , -1, false);
 369   def(_pop2                , "pop2"                , "b"    , NULL    , T_VOID   , -2, false);
 370   def(_dup                 , "dup"                 , "b"    , NULL    , T_VOID   ,  1, false);
 371   def(_dup_x1              , "dup_x1"              , "b"    , NULL    , T_VOID   ,  1, false);
 372   def(_dup_x2              , "dup_x2"              , "b"    , NULL    , T_VOID   ,  1, false);
 373   def(_dup2                , "dup2"                , "b"    , NULL    , T_VOID   ,  2, false);
 374   def(_dup2_x1             , "dup2_x1"             , "b"    , NULL    , T_VOID   ,  2, false);
 375   def(_dup2_x2             , "dup2_x2"             , "b"    , NULL    , T_VOID   ,  2, false);
 376   def(_swap                , "swap"                , "b"    , NULL    , T_VOID   ,  0, false);
 377   def(_iadd                , "iadd"                , "b"    , NULL    , T_INT    , -1, false);
 378   def(_ladd                , "ladd"                , "b"    , NULL    , T_LONG   , -2, false);
 379   def(_fadd                , "fadd"                , "b"    , NULL    , T_FLOAT  , -1, false);
 380   def(_dadd                , "dadd"                , "b"    , NULL    , T_DOUBLE , -2, false);
 381   def(_isub                , "isub"                , "b"    , NULL    , T_INT    , -1, false);
 382   def(_lsub                , "lsub"                , "b"    , NULL    , T_LONG   , -2, false);
 383   def(_fsub                , "fsub"                , "b"    , NULL    , T_FLOAT  , -1, false);
 384   def(_dsub                , "dsub"                , "b"    , NULL    , T_DOUBLE , -2, false);
 385   def(_imul                , "imul"                , "b"    , NULL    , T_INT    , -1, false);
 386   def(_lmul                , "lmul"                , "b"    , NULL    , T_LONG   , -2, false);
 387   def(_fmul                , "fmul"                , "b"    , NULL    , T_FLOAT  , -1, false);
 388   def(_dmul                , "dmul"                , "b"    , NULL    , T_DOUBLE , -2, false);
 389   def(_idiv                , "idiv"                , "b"    , NULL    , T_INT    , -1, true );
 390   def(_ldiv                , "ldiv"                , "b"    , NULL    , T_LONG   , -2, true );
 391   def(_fdiv                , "fdiv"                , "b"    , NULL    , T_FLOAT  , -1, false);
 392   def(_ddiv                , "ddiv"                , "b"    , NULL    , T_DOUBLE , -2, false);
 393   def(_irem                , "irem"                , "b"    , NULL    , T_INT    , -1, true );
 394   def(_lrem                , "lrem"                , "b"    , NULL    , T_LONG   , -2, true );
 395   def(_frem                , "frem"                , "b"    , NULL    , T_FLOAT  , -1, false);
 396   def(_drem                , "drem"                , "b"    , NULL    , T_DOUBLE , -2, false);
 397   def(_ineg                , "ineg"                , "b"    , NULL    , T_INT    ,  0, false);
 398   def(_lneg                , "lneg"                , "b"    , NULL    , T_LONG   ,  0, false);
 399   def(_fneg                , "fneg"                , "b"    , NULL    , T_FLOAT  ,  0, false);
 400   def(_dneg                , "dneg"                , "b"    , NULL    , T_DOUBLE ,  0, false);
 401   def(_ishl                , "ishl"                , "b"    , NULL    , T_INT    , -1, false);
 402   def(_lshl                , "lshl"                , "b"    , NULL    , T_LONG   , -1, false);
 403   def(_ishr                , "ishr"                , "b"    , NULL    , T_INT    , -1, false);
 404   def(_lshr                , "lshr"                , "b"    , NULL    , T_LONG   , -1, false);
 405   def(_iushr               , "iushr"               , "b"    , NULL    , T_INT    , -1, false);
 406   def(_lushr               , "lushr"               , "b"    , NULL    , T_LONG   , -1, false);
 407   def(_iand                , "iand"                , "b"    , NULL    , T_INT    , -1, false);
 408   def(_land                , "land"                , "b"    , NULL    , T_LONG   , -2, false);
 409   def(_ior                 , "ior"                 , "b"    , NULL    , T_INT    , -1, false);
 410   def(_lor                 , "lor"                 , "b"    , NULL    , T_LONG   , -2, false);
 411   def(_ixor                , "ixor"                , "b"    , NULL    , T_INT    , -1, false);
 412   def(_lxor                , "lxor"                , "b"    , NULL    , T_LONG   , -2, false);
 413   def(_iinc                , "iinc"                , "bic"  , "wbiicc", T_VOID   ,  0, false);
 414   def(_i2l                 , "i2l"                 , "b"    , NULL    , T_LONG   ,  1, false);
 415   def(_i2f                 , "i2f"                 , "b"    , NULL    , T_FLOAT  ,  0, false);
 416   def(_i2d                 , "i2d"                 , "b"    , NULL    , T_DOUBLE ,  1, false);
 417   def(_l2i                 , "l2i"                 , "b"    , NULL    , T_INT    , -1, false);
 418   def(_l2f                 , "l2f"                 , "b"    , NULL    , T_FLOAT  , -1, false);
 419   def(_l2d                 , "l2d"                 , "b"    , NULL    , T_DOUBLE ,  0, false);
 420   def(_f2i                 , "f2i"                 , "b"    , NULL    , T_INT    ,  0, false);
 421   def(_f2l                 , "f2l"                 , "b"    , NULL    , T_LONG   ,  1, false);
 422   def(_f2d                 , "f2d"                 , "b"    , NULL    , T_DOUBLE ,  1, false);
 423   def(_d2i                 , "d2i"                 , "b"    , NULL    , T_INT    , -1, false);
 424   def(_d2l                 , "d2l"                 , "b"    , NULL    , T_LONG   ,  0, false);
 425   def(_d2f                 , "d2f"                 , "b"    , NULL    , T_FLOAT  , -1, false);
 426   def(_i2b                 , "i2b"                 , "b"    , NULL    , T_BYTE   ,  0, false);
 427   def(_i2c                 , "i2c"                 , "b"    , NULL    , T_CHAR   ,  0, false);
 428   def(_i2s                 , "i2s"                 , "b"    , NULL    , T_SHORT  ,  0, false);
 429   def(_lcmp                , "lcmp"                , "b"    , NULL    , T_VOID   , -3, false);
 430   def(_fcmpl               , "fcmpl"               , "b"    , NULL    , T_VOID   , -1, false);
 431   def(_fcmpg               , "fcmpg"               , "b"    , NULL    , T_VOID   , -1, false);
 432   def(_dcmpl               , "dcmpl"               , "b"    , NULL    , T_VOID   , -3, false);
 433   def(_dcmpg               , "dcmpg"               , "b"    , NULL    , T_VOID   , -3, false);
 434   def(_ifeq                , "ifeq"                , "boo"  , NULL    , T_VOID   , -1, false);
 435   def(_ifne                , "ifne"                , "boo"  , NULL    , T_VOID   , -1, false);
 436   def(_iflt                , "iflt"                , "boo"  , NULL    , T_VOID   , -1, false);
 437   def(_ifge                , "ifge"                , "boo"  , NULL    , T_VOID   , -1, false);
 438   def(_ifgt                , "ifgt"                , "boo"  , NULL    , T_VOID   , -1, false);
 439   def(_ifle                , "ifle"                , "boo"  , NULL    , T_VOID   , -1, false);
 440   def(_if_icmpeq           , "if_icmpeq"           , "boo"  , NULL    , T_VOID   , -2, false);
 441   def(_if_icmpne           , "if_icmpne"           , "boo"  , NULL    , T_VOID   , -2, false);
 442   def(_if_icmplt           , "if_icmplt"           , "boo"  , NULL    , T_VOID   , -2, false);
 443   def(_if_icmpge           , "if_icmpge"           , "boo"  , NULL    , T_VOID   , -2, false);
 444   def(_if_icmpgt           , "if_icmpgt"           , "boo"  , NULL    , T_VOID   , -2, false);
 445   def(_if_icmple           , "if_icmple"           , "boo"  , NULL    , T_VOID   , -2, false);
 446   def(_if_acmpeq           , "if_acmpeq"           , "boo"  , NULL    , T_VOID   , -2, false);
 447   def(_if_acmpne           , "if_acmpne"           , "boo"  , NULL    , T_VOID   , -2, false);
 448   def(_goto                , "goto"                , "boo"  , NULL    , T_VOID   ,  0, false);
 449   def(_jsr                 , "jsr"                 , "boo"  , NULL    , T_INT    ,  0, false);
 450   def(_ret                 , "ret"                 , "bi"   , "wbii"  , T_VOID   ,  0, false);
 451   def(_tableswitch         , "tableswitch"         , ""     , NULL    , T_VOID   , -1, false); // may have backward branches
 452   def(_lookupswitch        , "lookupswitch"        , ""     , NULL    , T_VOID   , -1, false); // rewriting in interpreter
 453   def(_ireturn             , "ireturn"             , "b"    , NULL    , T_INT    , -1, true);
 454   def(_lreturn             , "lreturn"             , "b"    , NULL    , T_LONG   , -2, true);
 455   def(_freturn             , "freturn"             , "b"    , NULL    , T_FLOAT  , -1, true);
 456   def(_dreturn             , "dreturn"             , "b"    , NULL    , T_DOUBLE , -2, true);
 457   def(_areturn             , "areturn"             , "b"    , NULL    , T_OBJECT , -1, true);
 458   def(_return              , "return"              , "b"    , NULL    , T_VOID   ,  0, true);
 459   def(_getstatic           , "getstatic"           , "bJJ"  , NULL    , T_ILLEGAL,  1, true );
 460   def(_putstatic           , "putstatic"           , "bJJ"  , NULL    , T_ILLEGAL, -1, true );
 461   def(_getfield            , "getfield"            , "bJJ"  , NULL    , T_ILLEGAL,  0, true );
 462   def(_putfield            , "putfield"            , "bJJ"  , NULL    , T_ILLEGAL, -2, true );
 463   def(_invokevirtual       , "invokevirtual"       , "bJJ"  , NULL    , T_ILLEGAL, -1, true);
 464   def(_invokespecial       , "invokespecial"       , "bJJ"  , NULL    , T_ILLEGAL, -1, true);
 465   def(_invokestatic        , "invokestatic"        , "bJJ"  , NULL    , T_ILLEGAL,  0, true);
 466   def(_invokeinterface     , "invokeinterface"     , "bJJ__", NULL    , T_ILLEGAL, -1, true);
 467   def(_invokedynamic       , "invokedynamic"       , "bJJJJ", NULL    , T_ILLEGAL,  0, true );
 468   def(_new                 , "new"                 , "bkk"  , NULL    , T_OBJECT ,  1, true );
 469   def(_newarray            , "newarray"            , "bc"   , NULL    , T_OBJECT ,  0, true );
 470   def(_anewarray           , "anewarray"           , "bkk"  , NULL    , T_OBJECT ,  0, true );
 471   def(_arraylength         , "arraylength"         , "b"    , NULL    , T_VOID   ,  0, true );
 472   def(_athrow              , "athrow"              , "b"    , NULL    , T_VOID   , -1, true );
 473   def(_checkcast           , "checkcast"           , "bkk"  , NULL    , T_OBJECT ,  0, true );
 474   def(_instanceof          , "instanceof"          , "bkk"  , NULL    , T_INT    ,  0, true );
 475   def(_monitorenter        , "monitorenter"        , "b"    , NULL    , T_VOID   , -1, true );
 476   def(_monitorexit         , "monitorexit"         , "b"    , NULL    , T_VOID   , -1, true );
 477   def(_wide                , "wide"                , ""     , NULL    , T_VOID   ,  0, false);
 478   def(_multianewarray      , "multianewarray"      , "bkkc" , NULL    , T_OBJECT ,  1, true );
 479   def(_ifnull              , "ifnull"              , "boo"  , NULL    , T_VOID   , -1, false);
 480   def(_ifnonnull           , "ifnonnull"           , "boo"  , NULL    , T_VOID   , -1, false);
 481   def(_goto_w              , "goto_w"              , "boooo", NULL    , T_VOID   ,  0, false);
 482   def(_jsr_w               , "jsr_w"               , "boooo", NULL    , T_INT    ,  0, false);
 483   def(_breakpoint          , "breakpoint"          , ""     , NULL    , T_VOID   ,  0, true);
 484 
 485   //  JVM bytecodes
 486   //  bytecode               bytecode name           format   wide f.   result tp  stk traps  std code
 487 
 488   def(_fast_agetfield      , "fast_agetfield"      , "bJJ"  , NULL    , T_OBJECT ,  0, true , _getfield       );
 489   def(_fast_bgetfield      , "fast_bgetfield"      , "bJJ"  , NULL    , T_INT    ,  0, true , _getfield       );
 490   def(_fast_cgetfield      , "fast_cgetfield"      , "bJJ"  , NULL    , T_CHAR   ,  0, true , _getfield       );
 491   def(_fast_dgetfield      , "fast_dgetfield"      , "bJJ"  , NULL    , T_DOUBLE ,  0, true , _getfield       );
 492   def(_fast_fgetfield      , "fast_fgetfield"      , "bJJ"  , NULL    , T_FLOAT  ,  0, true , _getfield       );
 493   def(_fast_igetfield      , "fast_igetfield"      , "bJJ"  , NULL    , T_INT    ,  0, true , _getfield       );
 494   def(_fast_lgetfield      , "fast_lgetfield"      , "bJJ"  , NULL    , T_LONG   ,  0, true , _getfield       );
 495   def(_fast_sgetfield      , "fast_sgetfield"      , "bJJ"  , NULL    , T_SHORT  ,  0, true , _getfield       );
 496 
 497   def(_fast_aputfield      , "fast_aputfield"      , "bJJ"  , NULL    , T_OBJECT ,  0, true , _putfield       );
 498   def(_fast_bputfield      , "fast_bputfield"      , "bJJ"  , NULL    , T_INT    ,  0, true , _putfield       );
 499   def(_fast_cputfield      , "fast_cputfield"      , "bJJ"  , NULL    , T_CHAR   ,  0, true , _putfield       );
 500   def(_fast_dputfield      , "fast_dputfield"      , "bJJ"  , NULL    , T_DOUBLE ,  0, true , _putfield       );
 501   def(_fast_fputfield      , "fast_fputfield"      , "bJJ"  , NULL    , T_FLOAT  ,  0, true , _putfield       );
 502   def(_fast_iputfield      , "fast_iputfield"      , "bJJ"  , NULL    , T_INT    ,  0, true , _putfield       );
 503   def(_fast_lputfield      , "fast_lputfield"      , "bJJ"  , NULL    , T_LONG   ,  0, true , _putfield       );
 504   def(_fast_sputfield      , "fast_sputfield"      , "bJJ"  , NULL    , T_SHORT  ,  0, true , _putfield       );
 505 
 506   def(_fast_aload_0        , "fast_aload_0"        , "b"    , NULL    , T_OBJECT ,  1, true , _aload_0        );
 507   def(_fast_iaccess_0      , "fast_iaccess_0"      , "b_JJ" , NULL    , T_INT    ,  1, true , _aload_0        );
 508   def(_fast_aaccess_0      , "fast_aaccess_0"      , "b_JJ" , NULL    , T_OBJECT ,  1, true , _aload_0        );
 509   def(_fast_faccess_0      , "fast_faccess_0"      , "b_JJ" , NULL    , T_OBJECT ,  1, true , _aload_0        );
 510 
 511   def(_fast_iload          , "fast_iload"          , "bi"   , NULL    , T_INT    ,  1, false, _iload);
 512   def(_fast_iload2         , "fast_iload2"         , "bi_i" , NULL    , T_INT    ,  2, false, _iload);
 513   def(_fast_icaload        , "fast_icaload"        , "bi_"  , NULL    , T_INT    ,  0, false, _iload);
 514 
 515   // Faster method invocation.
 516   def(_fast_invokevfinal   , "fast_invokevfinal"   , "bJJ"  , NULL    , T_ILLEGAL, -1, true, _invokevirtual   );
 517 
 518   def(_fast_linearswitch   , "fast_linearswitch"   , ""     , NULL    , T_VOID   , -1, false, _lookupswitch   );
 519   def(_fast_binaryswitch   , "fast_binaryswitch"   , ""     , NULL    , T_VOID   , -1, false, _lookupswitch   );
 520 
 521   def(_return_register_finalizer , "return_register_finalizer" , "b"    , NULL    , T_VOID   ,  0, true, _return);
 522 
 523   def(_invokehandle        , "invokehandle"        , "bJJ"  , NULL    , T_ILLEGAL, -1, true, _invokevirtual   );
 524 
 525   def(_fast_aldc           , "fast_aldc"           , "bj"   , NULL    , T_OBJECT,   1, true,  _ldc   );
 526   def(_fast_aldc_w         , "fast_aldc_w"         , "bJJ"  , NULL    , T_OBJECT,   1, true,  _ldc_w );
 527 
 528   def(_nofast_getfield     , "nofast_getfield"     , "bJJ"  , NULL    , T_ILLEGAL,  0, true,  _getfield       );
 529   def(_nofast_putfield     , "nofast_putfield"     , "bJJ"  , NULL    , T_ILLEGAL, -2, true , _putfield       );
 530 
 531   def(_nofast_aload_0      , "nofast_aload_0"      , "b"    , NULL    , T_ILLEGAL,  1, true , _aload_0        );
 532   def(_nofast_iload        , "nofast_iload"        , "bi"   , NULL    , T_ILLEGAL,  1, false, _iload          );
 533 
 534   def(_shouldnotreachhere  , "_shouldnotreachhere" , "b"    , NULL    , T_VOID   ,  0, false);
 535 
 536   // compare can_trap information for each bytecode with the
 537   // can_trap information for the corresponding base bytecode
 538   // (if a rewritten bytecode can trap, so must the base bytecode)
 539   #ifdef ASSERT
 540     { for (int i = 0; i < number_of_codes; i++) {
 541         if (is_defined(i)) {
 542           Code code = cast(i);
 543           Code java = java_code(code);
 544           if (can_trap(code) && !can_trap(java))
 545             fatal("%s can trap => %s can trap, too", name(code), name(java));
 546         }
 547       }
 548     }
 549   #endif
 550 
 551   // initialization successful
 552   _is_initialized = true;
 553 }
 554 
 555 
 556 void bytecodes_init() {
 557   Bytecodes::initialize();
 558 }
 559 
 560 // Restore optimization
 561 #ifdef _M_AMD64
 562 #pragma optimize ("", on)
 563 #endif