1 /*
  2  * Copyright (c) 1997, 2020, 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/align.hpp"
 30 #include "utilities/bytes.hpp"
 31 
 32 
 33 #if defined(WIN32) && (defined(_MSC_VER) && (_MSC_VER < 1600))
 34 // Windows AMD64 Compiler Hangs compiling this file
 35 // unless optimization is off
 36 #ifdef _M_AMD64
 37 #pragma optimize ("", off)
 38 #endif
 39 #endif
 40 
 41 
 42 bool            Bytecodes::_is_initialized = false;
 43 const char*     Bytecodes::_name          [Bytecodes::number_of_codes];
 44 BasicType       Bytecodes::_result_type   [Bytecodes::number_of_codes];
 45 s_char          Bytecodes::_depth         [Bytecodes::number_of_codes];
 46 u_char          Bytecodes::_lengths       [Bytecodes::number_of_codes];
 47 Bytecodes::Code Bytecodes::_java_code     [Bytecodes::number_of_codes];
 48 unsigned short  Bytecodes::_flags         [(1<<BitsPerByte)*2];
 49 
 50 #ifdef ASSERT
 51 bool Bytecodes::check_method(const Method* method, address bcp) {
 52   return method->contains(bcp);
 53 }
 54 #endif
 55 
 56 bool Bytecodes::check_must_rewrite(Bytecodes::Code code) {
 57   assert(can_rewrite(code), "post-check only");
 58 
 59   // Some codes are conditionally rewriting.  Look closely at them.
 60   switch (code) {
 61   case Bytecodes::_aload_0:
 62     // Even if RewriteFrequentPairs is turned on,
 63     // the _aload_0 code might delay its rewrite until
 64     // a following _getfield rewrites itself.
 65     return false;
 66 
 67   case Bytecodes::_lookupswitch:
 68     return false;  // the rewrite is not done by the interpreter
 69 
 70   case Bytecodes::_new:
 71     // (Could actually look at the class here, but the profit would be small.)
 72     return false;  // the rewrite is not always done
 73 
 74   default:
 75     // No other special cases.
 76     return true;
 77   }
 78 }
 79 
 80 Bytecodes::Code Bytecodes::code_at(Method* method, int bci) {
 81   return code_at(method, method->bcp_from(bci));
 82 }
 83 
 84 Bytecodes::Code Bytecodes::non_breakpoint_code_at(const Method* method, address bcp) {
 85   assert(method != NULL, "must have the method for breakpoint conversion");
 86   assert(method->contains(bcp), "must be valid bcp in method");
 87   return method->orig_bytecode_at(method->bci_from(bcp));
 88 }
 89 
 90 int Bytecodes::special_length_at(Bytecodes::Code code, address bcp, address end) {
 91   switch (code) {
 92   case _wide:
 93     if (end != NULL && bcp + 1 >= end) {
 94       return -1; // don't read past end of code buffer
 95     }
 96     return wide_length_for(cast(*(bcp + 1)));
 97   case _tableswitch:
 98     { address aligned_bcp = align_up(bcp + 1, jintSize);
 99       if (end != NULL && aligned_bcp + 3*jintSize >= end) {
100         return -1; // don't read past end of code buffer
101       }
102       jlong lo = (jint)Bytes::get_Java_u4(aligned_bcp + 1*jintSize);
103       jlong hi = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
104       jlong len = (aligned_bcp - bcp) + (3 + hi - lo + 1)*jintSize;
105       // only return len if it can be represented as a positive int;
106       // return -1 otherwise
107       return (len > 0 && len == (int)len) ? len : -1;
108     }
109 
110   case _lookupswitch:      // fall through
111   case _fast_binaryswitch: // fall through
112   case _fast_linearswitch:
113     { address aligned_bcp = align_up(bcp + 1, jintSize);
114       if (end != NULL && aligned_bcp + 2*jintSize >= end) {
115         return -1; // don't read past end of code buffer
116       }
117       jlong npairs = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
118       jlong len = (aligned_bcp - bcp) + (2 + 2*npairs)*jintSize;
119       // only return len if it can be represented as a positive int;
120       // return -1 otherwise
121       return (len > 0 && len == (int)len) ? len : -1;
122     }
123   default:
124     // Note: Length functions must return <=0 for invalid bytecodes.
125     return 0;
126   }
127 }
128 
129 // At a breakpoint instruction, this returns the breakpoint's length,
130 // otherwise, it's the same as special_length_at().  This is used by
131 // the RawByteCodeStream, which wants to see the actual bytecode
132 // values (including breakpoint).  RawByteCodeStream is used by the
133 // verifier when reading in bytecode to verify.  Other mechanisms that
134 // run at runtime (such as generateOopMaps) need to iterate over the code
135 // and don't expect to see breakpoints: they want to see the instruction
136 // which was replaced so that they can get the correct length and find
137 // the next bytecode.
138 //
139 // 'end' indicates the end of the code buffer, which we should not try to read
140 // past.
141 int Bytecodes::raw_special_length_at(address bcp, address end) {
142   Code code = code_or_bp_at(bcp);
143   if (code == _breakpoint) {
144     return 1;
145   } else {
146     return special_length_at(code, bcp, end);
147   }
148 }
149 
150 
151 
152 void Bytecodes::def(Code code, const char* name, const char* format, const char* wide_format, BasicType result_type, int depth, bool can_trap) {
153   def(code, name, format, wide_format, result_type, depth, can_trap, code);
154 }
155 
156 
157 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) {
158   assert(wide_format == NULL || format != NULL, "short form must exist if there's a wide form");
159   int len  = (format      != NULL ? (int) strlen(format)      : 0);
160   int wlen = (wide_format != NULL ? (int) strlen(wide_format) : 0);
161   _name          [code] = name;
162   _result_type   [code] = result_type;
163   _depth         [code] = depth;
164   _lengths       [code] = (wlen << 4) | (len & 0xF);
165   _java_code     [code] = java_code;
166   int bc_flags = 0;
167   if (can_trap)           bc_flags |= _bc_can_trap;
168   if (java_code != code)  bc_flags |= _bc_can_rewrite;
169   _flags[(u1)code+0*(1<<BitsPerByte)] = compute_flags(format,      bc_flags);
170   _flags[(u1)code+1*(1<<BitsPerByte)] = compute_flags(wide_format, bc_flags);
171   assert(is_defined(code)      == (format != NULL),      "");
172   assert(wide_is_defined(code) == (wide_format != NULL), "");
173   assert(length_for(code)      == len, "");
174   assert(wide_length_for(code) == wlen, "");
175 }
176 
177 
178 // Format strings interpretation:
179 //
180 // b: bytecode
181 // c: signed constant, Java byte-ordering
182 // i: unsigned local index, Java byte-ordering (I = native byte ordering)
183 // j: unsigned CP cache index, Java byte-ordering (J = native byte ordering)
184 // k: unsigned CP index, Java byte-ordering
185 // o: branch offset, Java byte-ordering
186 // _: unused/ignored
187 // w: wide bytecode
188 //
189 // Note: The format strings are used for 2 purposes:
190 //       1. to specify the length of the bytecode
191 //          (= number of characters in format string)
192 //       2. to derive bytecode format flags (_fmt_has_k, etc.)
193 //
194 // Note: For bytecodes with variable length, the format string is the empty string.
195 
196 int Bytecodes::compute_flags(const char* format, int more_flags) {
197   if (format == NULL)  return 0;  // not even more_flags
198   int flags = more_flags;
199   const char* fp = format;
200   switch (*fp) {
201   case '\0':
202     flags |= _fmt_not_simple; // but variable
203     break;
204   case 'b':
205     flags |= _fmt_not_variable;  // but simple
206     ++fp;  // skip 'b'
207     break;
208   case 'w':
209     flags |= _fmt_not_variable | _fmt_not_simple;
210     ++fp;  // skip 'w'
211     guarantee(*fp == 'b', "wide format must start with 'wb'");
212     ++fp;  // skip 'b'
213     break;
214   }
215 
216   int has_nbo = 0, has_jbo = 0, has_size = 0;
217   for (;;) {
218     int this_flag = 0;
219     char fc = *fp++;
220     switch (fc) {
221     case '\0':  // end of string
222       assert(flags == (jchar)flags, "change _format_flags");
223       return flags;
224 
225     case '_': continue;         // ignore these
226 
227     case 'j': this_flag = _fmt_has_j; has_jbo = 1; break;
228     case 'k': this_flag = _fmt_has_k; has_jbo = 1; break;
229     case 'i': this_flag = _fmt_has_i; has_jbo = 1; break;
230     case 'c': this_flag = _fmt_has_c; has_jbo = 1; break;
231     case 'o': this_flag = _fmt_has_o; has_jbo = 1; break;
232 
233     // uppercase versions mark native byte order (from Rewriter)
234     // actually, only the 'J' case happens currently
235     case 'J': this_flag = _fmt_has_j; has_nbo = 1; break;
236     case 'K': this_flag = _fmt_has_k; has_nbo = 1; break;
237     case 'I': this_flag = _fmt_has_i; has_nbo = 1; break;
238     case 'C': this_flag = _fmt_has_c; has_nbo = 1; break;
239     case 'O': this_flag = _fmt_has_o; has_nbo = 1; break;
240     default:  guarantee(false, "bad char in format");
241     }
242 
243     flags |= this_flag;
244 
245     guarantee(!(has_jbo && has_nbo), "mixed byte orders in format");
246     if (has_nbo)
247       flags |= _fmt_has_nbo;
248 
249     int this_size = 1;
250     if (*fp == fc) {
251       // advance beyond run of the same characters
252       this_size = 2;
253       while (*++fp == fc)  this_size++;
254       switch (this_size) {
255       case 2: flags |= _fmt_has_u2; break;
256       case 4: flags |= _fmt_has_u4; break;
257       default: guarantee(false, "bad rep count in format");
258       }
259     }
260     guarantee(has_size == 0 ||                     // no field yet
261               this_size == has_size ||             // same size
262               this_size < has_size && *fp == '\0', // last field can be short
263               "mixed field sizes in format");
264     has_size = this_size;
265   }
266 }
267 
268 void Bytecodes::initialize() {
269   if (_is_initialized) return;
270   assert(number_of_codes <= 256, "too many bytecodes");
271 
272   // initialize bytecode tables - didn't use static array initializers
273   // (such as {}) so we can do additional consistency checks and init-
274   // code is independent of actual bytecode numbering.
275   //
276   // Note 1: NULL for the format string means the bytecode doesn't exist
277   //         in that form.
278   //
279   // Note 2: The result type is T_ILLEGAL for bytecodes where the top of stack
280   //         type after execution is not only determined by the bytecode itself.
281 
282   //  Java bytecodes
283   //  bytecode               bytecode name           format   wide f.   result tp  stk traps
284   def(_nop                 , "nop"                 , "b"    , NULL    , T_VOID   ,  0, false);
285   def(_aconst_null         , "aconst_null"         , "b"    , NULL    , T_OBJECT ,  1, false);
286   def(_iconst_m1           , "iconst_m1"           , "b"    , NULL    , T_INT    ,  1, false);
287   def(_iconst_0            , "iconst_0"            , "b"    , NULL    , T_INT    ,  1, false);
288   def(_iconst_1            , "iconst_1"            , "b"    , NULL    , T_INT    ,  1, false);
289   def(_iconst_2            , "iconst_2"            , "b"    , NULL    , T_INT    ,  1, false);
290   def(_iconst_3            , "iconst_3"            , "b"    , NULL    , T_INT    ,  1, false);
291   def(_iconst_4            , "iconst_4"            , "b"    , NULL    , T_INT    ,  1, false);
292   def(_iconst_5            , "iconst_5"            , "b"    , NULL    , T_INT    ,  1, false);
293   def(_lconst_0            , "lconst_0"            , "b"    , NULL    , T_LONG   ,  2, false);
294   def(_lconst_1            , "lconst_1"            , "b"    , NULL    , T_LONG   ,  2, false);
295   def(_fconst_0            , "fconst_0"            , "b"    , NULL    , T_FLOAT  ,  1, false);
296   def(_fconst_1            , "fconst_1"            , "b"    , NULL    , T_FLOAT  ,  1, false);
297   def(_fconst_2            , "fconst_2"            , "b"    , NULL    , T_FLOAT  ,  1, false);
298   def(_dconst_0            , "dconst_0"            , "b"    , NULL    , T_DOUBLE ,  2, false);
299   def(_dconst_1            , "dconst_1"            , "b"    , NULL    , T_DOUBLE ,  2, false);
300   def(_bipush              , "bipush"              , "bc"   , NULL    , T_INT    ,  1, false);
301   def(_sipush              , "sipush"              , "bcc"  , NULL    , T_INT    ,  1, false);
302   def(_ldc                 , "ldc"                 , "bk"   , NULL    , T_ILLEGAL,  1, true );
303   def(_ldc_w               , "ldc_w"               , "bkk"  , NULL    , T_ILLEGAL,  1, true );
304   def(_ldc2_w              , "ldc2_w"              , "bkk"  , NULL    , T_ILLEGAL,  2, true );
305   def(_iload               , "iload"               , "bi"   , "wbii"  , T_INT    ,  1, false);
306   def(_lload               , "lload"               , "bi"   , "wbii"  , T_LONG   ,  2, false);
307   def(_fload               , "fload"               , "bi"   , "wbii"  , T_FLOAT  ,  1, false);
308   def(_dload               , "dload"               , "bi"   , "wbii"  , T_DOUBLE ,  2, false);
309   def(_aload               , "aload"               , "bi"   , "wbii"  , T_OBJECT ,  1, false);
310   def(_iload_0             , "iload_0"             , "b"    , NULL    , T_INT    ,  1, false);
311   def(_iload_1             , "iload_1"             , "b"    , NULL    , T_INT    ,  1, false);
312   def(_iload_2             , "iload_2"             , "b"    , NULL    , T_INT    ,  1, false);
313   def(_iload_3             , "iload_3"             , "b"    , NULL    , T_INT    ,  1, false);
314   def(_lload_0             , "lload_0"             , "b"    , NULL    , T_LONG   ,  2, false);
315   def(_lload_1             , "lload_1"             , "b"    , NULL    , T_LONG   ,  2, false);
316   def(_lload_2             , "lload_2"             , "b"    , NULL    , T_LONG   ,  2, false);
317   def(_lload_3             , "lload_3"             , "b"    , NULL    , T_LONG   ,  2, false);
318   def(_fload_0             , "fload_0"             , "b"    , NULL    , T_FLOAT  ,  1, false);
319   def(_fload_1             , "fload_1"             , "b"    , NULL    , T_FLOAT  ,  1, false);
320   def(_fload_2             , "fload_2"             , "b"    , NULL    , T_FLOAT  ,  1, false);
321   def(_fload_3             , "fload_3"             , "b"    , NULL    , T_FLOAT  ,  1, false);
322   def(_dload_0             , "dload_0"             , "b"    , NULL    , T_DOUBLE ,  2, false);
323   def(_dload_1             , "dload_1"             , "b"    , NULL    , T_DOUBLE ,  2, false);
324   def(_dload_2             , "dload_2"             , "b"    , NULL    , T_DOUBLE ,  2, false);
325   def(_dload_3             , "dload_3"             , "b"    , NULL    , T_DOUBLE ,  2, false);
326   def(_aload_0             , "aload_0"             , "b"    , NULL    , T_OBJECT ,  1, true ); // rewriting in interpreter
327   def(_aload_1             , "aload_1"             , "b"    , NULL    , T_OBJECT ,  1, false);
328   def(_aload_2             , "aload_2"             , "b"    , NULL    , T_OBJECT ,  1, false);
329   def(_aload_3             , "aload_3"             , "b"    , NULL    , T_OBJECT ,  1, false);
330   def(_iaload              , "iaload"              , "b"    , NULL    , T_INT    , -1, true );
331   def(_laload              , "laload"              , "b"    , NULL    , T_LONG   ,  0, true );
332   def(_faload              , "faload"              , "b"    , NULL    , T_FLOAT  , -1, true );
333   def(_daload              , "daload"              , "b"    , NULL    , T_DOUBLE ,  0, true );
334   def(_aaload              , "aaload"              , "b"    , NULL    , T_OBJECT , -1, true );
335   def(_baload              , "baload"              , "b"    , NULL    , T_INT    , -1, true );
336   def(_caload              , "caload"              , "b"    , NULL    , T_INT    , -1, true );
337   def(_saload              , "saload"              , "b"    , NULL    , T_INT    , -1, true );
338   def(_istore              , "istore"              , "bi"   , "wbii"  , T_VOID   , -1, false);
339   def(_lstore              , "lstore"              , "bi"   , "wbii"  , T_VOID   , -2, false);
340   def(_fstore              , "fstore"              , "bi"   , "wbii"  , T_VOID   , -1, false);
341   def(_dstore              , "dstore"              , "bi"   , "wbii"  , T_VOID   , -2, false);
342   def(_astore              , "astore"              , "bi"   , "wbii"  , T_VOID   , -1, false);
343   def(_istore_0            , "istore_0"            , "b"    , NULL    , T_VOID   , -1, false);
344   def(_istore_1            , "istore_1"            , "b"    , NULL    , T_VOID   , -1, false);
345   def(_istore_2            , "istore_2"            , "b"    , NULL    , T_VOID   , -1, false);
346   def(_istore_3            , "istore_3"            , "b"    , NULL    , T_VOID   , -1, false);
347   def(_lstore_0            , "lstore_0"            , "b"    , NULL    , T_VOID   , -2, false);
348   def(_lstore_1            , "lstore_1"            , "b"    , NULL    , T_VOID   , -2, false);
349   def(_lstore_2            , "lstore_2"            , "b"    , NULL    , T_VOID   , -2, false);
350   def(_lstore_3            , "lstore_3"            , "b"    , NULL    , T_VOID   , -2, false);
351   def(_fstore_0            , "fstore_0"            , "b"    , NULL    , T_VOID   , -1, false);
352   def(_fstore_1            , "fstore_1"            , "b"    , NULL    , T_VOID   , -1, false);
353   def(_fstore_2            , "fstore_2"            , "b"    , NULL    , T_VOID   , -1, false);
354   def(_fstore_3            , "fstore_3"            , "b"    , NULL    , T_VOID   , -1, false);
355   def(_dstore_0            , "dstore_0"            , "b"    , NULL    , T_VOID   , -2, false);
356   def(_dstore_1            , "dstore_1"            , "b"    , NULL    , T_VOID   , -2, false);
357   def(_dstore_2            , "dstore_2"            , "b"    , NULL    , T_VOID   , -2, false);
358   def(_dstore_3            , "dstore_3"            , "b"    , NULL    , T_VOID   , -2, false);
359   def(_astore_0            , "astore_0"            , "b"    , NULL    , T_VOID   , -1, false);
360   def(_astore_1            , "astore_1"            , "b"    , NULL    , T_VOID   , -1, false);
361   def(_astore_2            , "astore_2"            , "b"    , NULL    , T_VOID   , -1, false);
362   def(_astore_3            , "astore_3"            , "b"    , NULL    , T_VOID   , -1, false);
363   def(_iastore             , "iastore"             , "b"    , NULL    , T_VOID   , -3, true );
364   def(_lastore             , "lastore"             , "b"    , NULL    , T_VOID   , -4, true );
365   def(_fastore             , "fastore"             , "b"    , NULL    , T_VOID   , -3, true );
366   def(_dastore             , "dastore"             , "b"    , NULL    , T_VOID   , -4, true );
367   def(_aastore             , "aastore"             , "b"    , NULL    , T_VOID   , -3, true );
368   def(_bastore             , "bastore"             , "b"    , NULL    , T_VOID   , -3, true );
369   def(_castore             , "castore"             , "b"    , NULL    , T_VOID   , -3, true );
370   def(_sastore             , "sastore"             , "b"    , NULL    , T_VOID   , -3, true );
371   def(_pop                 , "pop"                 , "b"    , NULL    , T_VOID   , -1, false);
372   def(_pop2                , "pop2"                , "b"    , NULL    , T_VOID   , -2, false);
373   def(_dup                 , "dup"                 , "b"    , NULL    , T_VOID   ,  1, false);
374   def(_dup_x1              , "dup_x1"              , "b"    , NULL    , T_VOID   ,  1, false);
375   def(_dup_x2              , "dup_x2"              , "b"    , NULL    , T_VOID   ,  1, false);
376   def(_dup2                , "dup2"                , "b"    , NULL    , T_VOID   ,  2, false);
377   def(_dup2_x1             , "dup2_x1"             , "b"    , NULL    , T_VOID   ,  2, false);
378   def(_dup2_x2             , "dup2_x2"             , "b"    , NULL    , T_VOID   ,  2, false);
379   def(_swap                , "swap"                , "b"    , NULL    , T_VOID   ,  0, false);
380   def(_iadd                , "iadd"                , "b"    , NULL    , T_INT    , -1, false);
381   def(_ladd                , "ladd"                , "b"    , NULL    , T_LONG   , -2, false);
382   def(_fadd                , "fadd"                , "b"    , NULL    , T_FLOAT  , -1, false);
383   def(_dadd                , "dadd"                , "b"    , NULL    , T_DOUBLE , -2, false);
384   def(_isub                , "isub"                , "b"    , NULL    , T_INT    , -1, false);
385   def(_lsub                , "lsub"                , "b"    , NULL    , T_LONG   , -2, false);
386   def(_fsub                , "fsub"                , "b"    , NULL    , T_FLOAT  , -1, false);
387   def(_dsub                , "dsub"                , "b"    , NULL    , T_DOUBLE , -2, false);
388   def(_imul                , "imul"                , "b"    , NULL    , T_INT    , -1, false);
389   def(_lmul                , "lmul"                , "b"    , NULL    , T_LONG   , -2, false);
390   def(_fmul                , "fmul"                , "b"    , NULL    , T_FLOAT  , -1, false);
391   def(_dmul                , "dmul"                , "b"    , NULL    , T_DOUBLE , -2, false);
392   def(_idiv                , "idiv"                , "b"    , NULL    , T_INT    , -1, true );
393   def(_ldiv                , "ldiv"                , "b"    , NULL    , T_LONG   , -2, true );
394   def(_fdiv                , "fdiv"                , "b"    , NULL    , T_FLOAT  , -1, false);
395   def(_ddiv                , "ddiv"                , "b"    , NULL    , T_DOUBLE , -2, false);
396   def(_irem                , "irem"                , "b"    , NULL    , T_INT    , -1, true );
397   def(_lrem                , "lrem"                , "b"    , NULL    , T_LONG   , -2, true );
398   def(_frem                , "frem"                , "b"    , NULL    , T_FLOAT  , -1, false);
399   def(_drem                , "drem"                , "b"    , NULL    , T_DOUBLE , -2, false);
400   def(_ineg                , "ineg"                , "b"    , NULL    , T_INT    ,  0, false);
401   def(_lneg                , "lneg"                , "b"    , NULL    , T_LONG   ,  0, false);
402   def(_fneg                , "fneg"                , "b"    , NULL    , T_FLOAT  ,  0, false);
403   def(_dneg                , "dneg"                , "b"    , NULL    , T_DOUBLE ,  0, false);
404   def(_ishl                , "ishl"                , "b"    , NULL    , T_INT    , -1, false);
405   def(_lshl                , "lshl"                , "b"    , NULL    , T_LONG   , -1, false);
406   def(_ishr                , "ishr"                , "b"    , NULL    , T_INT    , -1, false);
407   def(_lshr                , "lshr"                , "b"    , NULL    , T_LONG   , -1, false);
408   def(_iushr               , "iushr"               , "b"    , NULL    , T_INT    , -1, false);
409   def(_lushr               , "lushr"               , "b"    , NULL    , T_LONG   , -1, false);
410   def(_iand                , "iand"                , "b"    , NULL    , T_INT    , -1, false);
411   def(_land                , "land"                , "b"    , NULL    , T_LONG   , -2, false);
412   def(_ior                 , "ior"                 , "b"    , NULL    , T_INT    , -1, false);
413   def(_lor                 , "lor"                 , "b"    , NULL    , T_LONG   , -2, false);
414   def(_ixor                , "ixor"                , "b"    , NULL    , T_INT    , -1, false);
415   def(_lxor                , "lxor"                , "b"    , NULL    , T_LONG   , -2, false);
416   def(_iinc                , "iinc"                , "bic"  , "wbiicc", T_VOID   ,  0, false);
417   def(_i2l                 , "i2l"                 , "b"    , NULL    , T_LONG   ,  1, false);
418   def(_i2f                 , "i2f"                 , "b"    , NULL    , T_FLOAT  ,  0, false);
419   def(_i2d                 , "i2d"                 , "b"    , NULL    , T_DOUBLE ,  1, false);
420   def(_l2i                 , "l2i"                 , "b"    , NULL    , T_INT    , -1, false);
421   def(_l2f                 , "l2f"                 , "b"    , NULL    , T_FLOAT  , -1, false);
422   def(_l2d                 , "l2d"                 , "b"    , NULL    , T_DOUBLE ,  0, false);
423   def(_f2i                 , "f2i"                 , "b"    , NULL    , T_INT    ,  0, false);
424   def(_f2l                 , "f2l"                 , "b"    , NULL    , T_LONG   ,  1, false);
425   def(_f2d                 , "f2d"                 , "b"    , NULL    , T_DOUBLE ,  1, false);
426   def(_d2i                 , "d2i"                 , "b"    , NULL    , T_INT    , -1, false);
427   def(_d2l                 , "d2l"                 , "b"    , NULL    , T_LONG   ,  0, false);
428   def(_d2f                 , "d2f"                 , "b"    , NULL    , T_FLOAT  , -1, false);
429   def(_i2b                 , "i2b"                 , "b"    , NULL    , T_BYTE   ,  0, false);
430   def(_i2c                 , "i2c"                 , "b"    , NULL    , T_CHAR   ,  0, false);
431   def(_i2s                 , "i2s"                 , "b"    , NULL    , T_SHORT  ,  0, false);
432   def(_lcmp                , "lcmp"                , "b"    , NULL    , T_VOID   , -3, false);
433   def(_fcmpl               , "fcmpl"               , "b"    , NULL    , T_VOID   , -1, false);
434   def(_fcmpg               , "fcmpg"               , "b"    , NULL    , T_VOID   , -1, false);
435   def(_dcmpl               , "dcmpl"               , "b"    , NULL    , T_VOID   , -3, false);
436   def(_dcmpg               , "dcmpg"               , "b"    , NULL    , T_VOID   , -3, false);
437   def(_ifeq                , "ifeq"                , "boo"  , NULL    , T_VOID   , -1, false);
438   def(_ifne                , "ifne"                , "boo"  , NULL    , T_VOID   , -1, false);
439   def(_iflt                , "iflt"                , "boo"  , NULL    , T_VOID   , -1, false);
440   def(_ifge                , "ifge"                , "boo"  , NULL    , T_VOID   , -1, false);
441   def(_ifgt                , "ifgt"                , "boo"  , NULL    , T_VOID   , -1, false);
442   def(_ifle                , "ifle"                , "boo"  , NULL    , T_VOID   , -1, false);
443   def(_if_icmpeq           , "if_icmpeq"           , "boo"  , NULL    , T_VOID   , -2, false);
444   def(_if_icmpne           , "if_icmpne"           , "boo"  , NULL    , T_VOID   , -2, false);
445   def(_if_icmplt           , "if_icmplt"           , "boo"  , NULL    , T_VOID   , -2, false);
446   def(_if_icmpge           , "if_icmpge"           , "boo"  , NULL    , T_VOID   , -2, false);
447   def(_if_icmpgt           , "if_icmpgt"           , "boo"  , NULL    , T_VOID   , -2, false);
448   def(_if_icmple           , "if_icmple"           , "boo"  , NULL    , T_VOID   , -2, false);
449   def(_if_acmpeq           , "if_acmpeq"           , "boo"  , NULL    , T_VOID   , -2, false);
450   def(_if_acmpne           , "if_acmpne"           , "boo"  , NULL    , T_VOID   , -2, false);
451   def(_goto                , "goto"                , "boo"  , NULL    , T_VOID   ,  0, false);
452   def(_jsr                 , "jsr"                 , "boo"  , NULL    , T_INT    ,  0, false);
453   def(_ret                 , "ret"                 , "bi"   , "wbii"  , T_VOID   ,  0, false);
454   def(_tableswitch         , "tableswitch"         , ""     , NULL    , T_VOID   , -1, false); // may have backward branches
455   def(_lookupswitch        , "lookupswitch"        , ""     , NULL    , T_VOID   , -1, false); // rewriting in interpreter
456   def(_ireturn             , "ireturn"             , "b"    , NULL    , T_INT    , -1, true);
457   def(_lreturn             , "lreturn"             , "b"    , NULL    , T_LONG   , -2, true);
458   def(_freturn             , "freturn"             , "b"    , NULL    , T_FLOAT  , -1, true);
459   def(_dreturn             , "dreturn"             , "b"    , NULL    , T_DOUBLE , -2, true);
460   def(_areturn             , "areturn"             , "b"    , NULL    , T_OBJECT , -1, true);
461   def(_return              , "return"              , "b"    , NULL    , T_VOID   ,  0, true);
462   def(_getstatic           , "getstatic"           , "bJJ"  , NULL    , T_ILLEGAL,  1, true );
463   def(_putstatic           , "putstatic"           , "bJJ"  , NULL    , T_ILLEGAL, -1, true );
464   def(_getfield            , "getfield"            , "bJJ"  , NULL    , T_ILLEGAL,  0, true );
465   def(_putfield            , "putfield"            , "bJJ"  , NULL    , T_ILLEGAL, -2, true );
466   def(_invokevirtual       , "invokevirtual"       , "bJJ"  , NULL    , T_ILLEGAL, -1, true);
467   def(_invokespecial       , "invokespecial"       , "bJJ"  , NULL    , T_ILLEGAL, -1, true);
468   def(_invokestatic        , "invokestatic"        , "bJJ"  , NULL    , T_ILLEGAL,  0, true);
469   def(_invokeinterface     , "invokeinterface"     , "bJJ__", NULL    , T_ILLEGAL, -1, true);
470   def(_invokedynamic       , "invokedynamic"       , "bJJJJ", NULL    , T_ILLEGAL,  0, true );
471   def(_new                 , "new"                 , "bkk"  , NULL    , T_OBJECT ,  1, true );
472   def(_newarray            , "newarray"            , "bc"   , NULL    , T_OBJECT ,  0, true );
473   def(_anewarray           , "anewarray"           , "bkk"  , NULL    , T_OBJECT ,  0, true );
474   def(_arraylength         , "arraylength"         , "b"    , NULL    , T_VOID   ,  0, true );
475   def(_athrow              , "athrow"              , "b"    , NULL    , T_VOID   , -1, true );
476   def(_checkcast           , "checkcast"           , "bkk"  , NULL    , T_OBJECT ,  0, true );
477   def(_instanceof          , "instanceof"          , "bkk"  , NULL    , T_INT    ,  0, true );
478   def(_monitorenter        , "monitorenter"        , "b"    , NULL    , T_VOID   , -1, true );
479   def(_monitorexit         , "monitorexit"         , "b"    , NULL    , T_VOID   , -1, true );
480   def(_wide                , "wide"                , ""     , NULL    , T_VOID   ,  0, false);
481   def(_multianewarray      , "multianewarray"      , "bkkc" , NULL    , T_OBJECT ,  1, true );
482   def(_ifnull              , "ifnull"              , "boo"  , NULL    , T_VOID   , -1, false);
483   def(_ifnonnull           , "ifnonnull"           , "boo"  , NULL    , T_VOID   , -1, false);
484   def(_goto_w              , "goto_w"              , "boooo", NULL    , T_VOID   ,  0, false);
485   def(_jsr_w               , "jsr_w"               , "boooo", NULL    , T_INT    ,  0, false);
486   def(_breakpoint          , "breakpoint"          , ""     , NULL    , T_VOID   ,  0, true);
487 
488   //  JVM bytecodes
489   //  bytecode               bytecode name           format   wide f.   result tp  stk traps  std code
490 
491   def(_fast_agetfield      , "fast_agetfield"      , "bJJ"  , NULL    , T_OBJECT ,  0, true , _getfield       );
492   def(_fast_bgetfield      , "fast_bgetfield"      , "bJJ"  , NULL    , T_INT    ,  0, true , _getfield       );
493   def(_fast_cgetfield      , "fast_cgetfield"      , "bJJ"  , NULL    , T_CHAR   ,  0, true , _getfield       );
494   def(_fast_dgetfield      , "fast_dgetfield"      , "bJJ"  , NULL    , T_DOUBLE ,  0, true , _getfield       );
495   def(_fast_fgetfield      , "fast_fgetfield"      , "bJJ"  , NULL    , T_FLOAT  ,  0, true , _getfield       );
496   def(_fast_igetfield      , "fast_igetfield"      , "bJJ"  , NULL    , T_INT    ,  0, true , _getfield       );
497   def(_fast_lgetfield      , "fast_lgetfield"      , "bJJ"  , NULL    , T_LONG   ,  0, true , _getfield       );
498   def(_fast_sgetfield      , "fast_sgetfield"      , "bJJ"  , NULL    , T_SHORT  ,  0, true , _getfield       );
499 
500   def(_fast_aputfield      , "fast_aputfield"      , "bJJ"  , NULL    , T_OBJECT ,  0, true , _putfield       );
501   def(_fast_bputfield      , "fast_bputfield"      , "bJJ"  , NULL    , T_INT    ,  0, true , _putfield       );
502   def(_fast_zputfield      , "fast_zputfield"      , "bJJ"  , NULL    , T_INT    ,  0, true , _putfield       );
503   def(_fast_cputfield      , "fast_cputfield"      , "bJJ"  , NULL    , T_CHAR   ,  0, true , _putfield       );
504   def(_fast_dputfield      , "fast_dputfield"      , "bJJ"  , NULL    , T_DOUBLE ,  0, true , _putfield       );
505   def(_fast_fputfield      , "fast_fputfield"      , "bJJ"  , NULL    , T_FLOAT  ,  0, true , _putfield       );
506   def(_fast_iputfield      , "fast_iputfield"      , "bJJ"  , NULL    , T_INT    ,  0, true , _putfield       );
507   def(_fast_lputfield      , "fast_lputfield"      , "bJJ"  , NULL    , T_LONG   ,  0, true , _putfield       );
508   def(_fast_sputfield      , "fast_sputfield"      , "bJJ"  , NULL    , T_SHORT  ,  0, true , _putfield       );
509 
510   def(_fast_aload_0        , "fast_aload_0"        , "b"    , NULL    , T_OBJECT ,  1, true , _aload_0        );
511   def(_fast_iaccess_0      , "fast_iaccess_0"      , "b_JJ" , NULL    , T_INT    ,  1, true , _aload_0        );
512   def(_fast_aaccess_0      , "fast_aaccess_0"      , "b_JJ" , NULL    , T_OBJECT ,  1, true , _aload_0        );
513   def(_fast_faccess_0      , "fast_faccess_0"      , "b_JJ" , NULL    , T_OBJECT ,  1, true , _aload_0        );
514 
515   def(_fast_iload          , "fast_iload"          , "bi"   , NULL    , T_INT    ,  1, false, _iload);
516   def(_fast_iload2         , "fast_iload2"         , "bi_i" , NULL    , T_INT    ,  2, false, _iload);
517   def(_fast_icaload        , "fast_icaload"        , "bi_"  , NULL    , T_INT    ,  0, false, _iload);
518 
519   // Faster method invocation.
520   def(_fast_invokevfinal   , "fast_invokevfinal"   , "bJJ"  , NULL    , T_ILLEGAL, -1, true, _invokevirtual   );
521 
522   def(_fast_linearswitch   , "fast_linearswitch"   , ""     , NULL    , T_VOID   , -1, false, _lookupswitch   );
523   def(_fast_binaryswitch   , "fast_binaryswitch"   , ""     , NULL    , T_VOID   , -1, false, _lookupswitch   );
524 
525   def(_return_register_finalizer , "return_register_finalizer" , "b"    , NULL    , T_VOID   ,  0, true, _return);
526 
527   def(_invokehandle        , "invokehandle"        , "bJJ"  , NULL    , T_ILLEGAL, -1, true, _invokevirtual   );
528 
529   def(_fast_aldc           , "fast_aldc"           , "bj"   , NULL    , T_OBJECT,   1, true,  _ldc   );
530   def(_fast_aldc_w         , "fast_aldc_w"         , "bJJ"  , NULL    , T_OBJECT,   1, true,  _ldc_w );
531 
532   def(_nofast_getfield     , "nofast_getfield"     , "bJJ"  , NULL    , T_ILLEGAL,  0, true,  _getfield       );
533   def(_nofast_putfield     , "nofast_putfield"     , "bJJ"  , NULL    , T_ILLEGAL, -2, true , _putfield       );
534 
535   def(_nofast_aload_0      , "nofast_aload_0"      , "b"    , NULL    , T_OBJECT,   1, true , _aload_0        );
536   def(_nofast_iload        , "nofast_iload"        , "bi"   , NULL    , T_INT,      1, false, _iload          );
537 
538   def(_shouldnotreachhere  , "_shouldnotreachhere" , "b"    , NULL    , T_VOID   ,  0, false);
539 
540   // compare can_trap information for each bytecode with the
541   // can_trap information for the corresponding base bytecode
542   // (if a rewritten bytecode can trap, so must the base bytecode)
543   #ifdef ASSERT
544     { for (int i = 0; i < number_of_codes; i++) {
545         if (is_defined(i)) {
546           Code code = cast(i);
547           Code java = java_code(code);
548           if (can_trap(code) && !can_trap(java))
549             fatal("%s can trap => %s can trap, too", name(code), name(java));
550         }
551       }
552     }
553   #endif
554 
555   // initialization successful
556   _is_initialized = true;
557 }
558 
559 
560 void bytecodes_init() {
561   Bytecodes::initialize();
562 }
563 
564 // Restore optimization
565 #ifdef _M_AMD64
566 #pragma optimize ("", on)
567 #endif