1 /*
   2  * Copyright (c) 1997, 2010, 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 "classfile/vmSymbols.hpp"
  27 #include "memory/oopFactory.hpp"
  28 #include "oops/oop.inline.hpp"
  29 #include "runtime/handles.inline.hpp"
  30 #include "utilities/xmlstream.hpp"
  31 
  32 
  33 symbolOop vmSymbols::_symbols[vmSymbols::SID_LIMIT];
  34 
  35 symbolOop vmSymbols::_type_signatures[T_VOID+1] = { NULL /*, NULL...*/ };
  36 
  37 inline int compare_symbol(symbolOop a, symbolOop b) {
  38   if (a == b)  return 0;
  39   // follow the natural address order:
  40   return (address)a > (address)b ? +1 : -1;
  41 }
  42 
  43 static vmSymbols::SID vm_symbol_index[vmSymbols::SID_LIMIT];
  44 extern "C" {
  45   static int compare_vmsymbol_sid(const void* void_a, const void* void_b) {
  46     symbolOop a = vmSymbols::symbol_at(*((vmSymbols::SID*) void_a));
  47     symbolOop b = vmSymbols::symbol_at(*((vmSymbols::SID*) void_b));
  48     return compare_symbol(a, b);
  49   }
  50 }
  51 
  52 #ifndef PRODUCT
  53 #define VM_SYMBOL_ENUM_NAME_BODY(name, string) #name "\0"
  54 static const char* vm_symbol_enum_names =
  55   VM_SYMBOLS_DO(VM_SYMBOL_ENUM_NAME_BODY, VM_ALIAS_IGNORE)
  56   "\0";
  57 static const char* vm_symbol_enum_name(vmSymbols::SID sid) {
  58   const char* string = &vm_symbol_enum_names[0];
  59   int skip = (int)sid - (int)vmSymbols::FIRST_SID;
  60   for (; skip != 0; skip--) {
  61     size_t skiplen = strlen(string);
  62     if (skiplen == 0)  return "<unknown>";  // overflow
  63     string += skiplen+1;
  64   }
  65   return string;
  66 }
  67 #endif //PRODUCT
  68 
  69 // Put all the VM symbol strings in one place.
  70 // Makes for a more compact libjvm.
  71 #define VM_SYMBOL_BODY(name, string) string "\0"
  72 static const char* vm_symbol_bodies = VM_SYMBOLS_DO(VM_SYMBOL_BODY, VM_ALIAS_IGNORE);
  73 
  74 void vmSymbols::initialize(TRAPS) {
  75   assert((int)SID_LIMIT <= (1<<log2_SID_LIMIT), "must fit in this bitfield");
  76   assert((int)SID_LIMIT*5 > (1<<log2_SID_LIMIT), "make the bitfield smaller, please");
  77   assert(vmIntrinsics::FLAG_LIMIT <= (1 << vmIntrinsics::log2_FLAG_LIMIT), "must fit in this bitfield");
  78 
  79   if (!UseSharedSpaces) {
  80     const char* string = &vm_symbol_bodies[0];
  81     for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
  82       symbolOop sym = oopFactory::new_symbol(string, CHECK);
  83       _symbols[index] = sym;
  84       string += strlen(string); // skip string body
  85       string += 1;              // skip trailing null
  86     }
  87 
  88     _type_signatures[T_BYTE]    = byte_signature();
  89     _type_signatures[T_CHAR]    = char_signature();
  90     _type_signatures[T_DOUBLE]  = double_signature();
  91     _type_signatures[T_FLOAT]   = float_signature();
  92     _type_signatures[T_INT]     = int_signature();
  93     _type_signatures[T_LONG]    = long_signature();
  94     _type_signatures[T_SHORT]   = short_signature();
  95     _type_signatures[T_BOOLEAN] = bool_signature();
  96     _type_signatures[T_VOID]    = void_signature();
  97     // no single signatures for T_OBJECT or T_ARRAY
  98   }
  99 
 100 #ifdef ASSERT
 101   // Check for duplicates:
 102   for (int i1 = (int)FIRST_SID; i1 < (int)SID_LIMIT; i1++) {
 103     symbolOop sym = symbol_at((SID)i1);
 104     for (int i2 = (int)FIRST_SID; i2 < i1; i2++) {
 105       if (symbol_at((SID)i2) == sym) {
 106         tty->print("*** Duplicate VM symbol SIDs %s(%d) and %s(%d): \"",
 107                    vm_symbol_enum_name((SID)i2), i2,
 108                    vm_symbol_enum_name((SID)i1), i1);
 109         sym->print_symbol_on(tty);
 110         tty->print_cr("\"");
 111       }
 112     }
 113   }
 114 #endif //ASSERT
 115 
 116   // Create an index for find_id:
 117   {
 118     for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
 119       vm_symbol_index[index] = (SID)index;
 120     }
 121     int num_sids = SID_LIMIT-FIRST_SID;
 122     qsort(&vm_symbol_index[FIRST_SID], num_sids, sizeof(vm_symbol_index[0]),
 123           compare_vmsymbol_sid);
 124   }
 125 
 126 #ifdef ASSERT
 127   {
 128     // Spot-check correspondence between strings, symbols, and enums:
 129     assert(_symbols[NO_SID] == NULL, "must be");
 130     const char* str = "java/lang/Object";
 131     symbolOop sym = oopFactory::new_symbol(str, CHECK);
 132     assert(strcmp(str, (char*)sym->base()) == 0, "");
 133     assert(sym == java_lang_Object(), "");
 134     SID sid = VM_SYMBOL_ENUM_NAME(java_lang_Object);
 135     assert(find_sid(sym) == sid, "");
 136     assert(symbol_at(sid) == sym, "");
 137 
 138     // Make sure find_sid produces the right answer in each case.
 139     for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
 140       sym = symbol_at((SID)index);
 141       sid = find_sid(sym);
 142       assert(sid == (SID)index, "symbol index works");
 143       // Note:  If there are duplicates, this assert will fail.
 144       // A "Duplicate VM symbol" message will have already been printed.
 145     }
 146 
 147     // The string "format" happens (at the moment) not to be a vmSymbol,
 148     // though it is a method name in java.lang.String.
 149     str = "format";
 150     sym = oopFactory::new_symbol(str, CHECK);
 151     sid = find_sid(sym);
 152     assert(sid == NO_SID, "symbol index works (negative test)");
 153   }
 154 #endif
 155 }
 156 
 157 
 158 #ifndef PRODUCT
 159 const char* vmSymbols::name_for(vmSymbols::SID sid) {
 160   if (sid == NO_SID)
 161     return "NO_SID";
 162   const char* string = &vm_symbol_bodies[0];
 163   for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
 164     if (index == (int)sid)
 165       return string;
 166     string += strlen(string); // skip string body
 167     string += 1;              // skip trailing null
 168   }
 169   return "BAD_SID";
 170 }
 171 #endif
 172 
 173 
 174 
 175 void vmSymbols::oops_do(OopClosure* f, bool do_all) {
 176   for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
 177     f->do_oop((oop*) &_symbols[index]);
 178   }
 179   for (int i = 0; i < T_VOID+1; i++) {
 180     if (_type_signatures[i] != NULL) {
 181       assert(i >= T_BOOLEAN, "checking");
 182       f->do_oop((oop*)&_type_signatures[i]);
 183     } else if (do_all) {
 184       f->do_oop((oop*)&_type_signatures[i]);
 185     }
 186   }
 187 }
 188 
 189 
 190 BasicType vmSymbols::signature_type(symbolOop s) {
 191   assert(s != NULL, "checking");
 192   for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 193     if (s == _type_signatures[i]) {
 194       return (BasicType)i;
 195     }
 196   }
 197   return T_OBJECT;
 198 }
 199 
 200 
 201 static int mid_hint = (int)vmSymbols::FIRST_SID+1;
 202 
 203 #ifndef PRODUCT
 204 static int find_sid_calls, find_sid_probes;
 205 // (Typical counts are calls=7000 and probes=17000.)
 206 #endif
 207 
 208 vmSymbols::SID vmSymbols::find_sid(symbolOop symbol) {
 209   // Handle the majority of misses by a bounds check.
 210   // Then, use a binary search over the index.
 211   // Expected trip count is less than log2_SID_LIMIT, about eight.
 212   // This is slow but acceptable, given that calls are not
 213   // dynamically common.  (methodOop::intrinsic_id has a cache.)
 214   NOT_PRODUCT(find_sid_calls++);
 215   int min = (int)FIRST_SID, max = (int)SID_LIMIT - 1;
 216   SID sid = NO_SID, sid1;
 217   int cmp1;
 218   sid1 = vm_symbol_index[min];
 219   cmp1 = compare_symbol(symbol, symbol_at(sid1));
 220   if (cmp1 <= 0) {              // before the first
 221     if (cmp1 == 0)  sid = sid1;
 222   } else {
 223     sid1 = vm_symbol_index[max];
 224     cmp1 = compare_symbol(symbol, symbol_at(sid1));
 225     if (cmp1 >= 0) {            // after the last
 226       if (cmp1 == 0)  sid = sid1;
 227     } else {
 228       // After checking the extremes, do a binary search.
 229       ++min; --max;             // endpoints are done
 230       int mid = mid_hint;       // start at previous success
 231       while (max >= min) {
 232         assert(mid >= min && mid <= max, "");
 233         NOT_PRODUCT(find_sid_probes++);
 234         sid1 = vm_symbol_index[mid];
 235         cmp1 = compare_symbol(symbol, symbol_at(sid1));
 236         if (cmp1 == 0) {
 237           mid_hint = mid;
 238           sid = sid1;
 239           break;
 240         }
 241         if (cmp1 < 0)
 242           max = mid - 1;        // symbol < symbol_at(sid)
 243         else
 244           min = mid + 1;
 245 
 246         // Pick a new probe point:
 247         mid = (max + min) / 2;
 248       }
 249     }
 250   }
 251 
 252 #ifdef ASSERT
 253   // Perform the exhaustive self-check the first 1000 calls,
 254   // and every 100 calls thereafter.
 255   static int find_sid_check_count = -2000;
 256   if ((uint)++find_sid_check_count > (uint)100) {
 257     if (find_sid_check_count > 0)  find_sid_check_count = 0;
 258 
 259     // Make sure this is the right answer, using linear search.
 260     // (We have already proven that there are no duplicates in the list.)
 261     SID sid2 = NO_SID;
 262     for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
 263       symbolOop sym2 = symbol_at((SID)index);
 264       if (sym2 == symbol) {
 265         sid2 = (SID)index;
 266         break;
 267       }
 268     }
 269     // Unless it's a duplicate, assert that the sids are the same.
 270     if (_symbols[sid] != _symbols[sid2]) {
 271       assert(sid == sid2, "binary same as linear search");
 272     }
 273   }
 274 #endif //ASSERT
 275 
 276   return sid;
 277 }
 278 
 279 static vmIntrinsics::ID wrapper_intrinsic(BasicType type, bool unboxing) {
 280 #define TYPE2(type, unboxing) ((int)(type)*2 + ((unboxing) ? 1 : 0))
 281   switch (TYPE2(type, unboxing)) {
 282 #define BASIC_TYPE_CASE(type, box, unbox) \
 283     case TYPE2(type, false):  return vmIntrinsics::box; \
 284     case TYPE2(type, true):   return vmIntrinsics::unbox
 285     BASIC_TYPE_CASE(T_BOOLEAN, _Boolean_valueOf,   _booleanValue);
 286     BASIC_TYPE_CASE(T_BYTE,    _Byte_valueOf,      _byteValue);
 287     BASIC_TYPE_CASE(T_CHAR,    _Character_valueOf, _charValue);
 288     BASIC_TYPE_CASE(T_SHORT,   _Short_valueOf,     _shortValue);
 289     BASIC_TYPE_CASE(T_INT,     _Integer_valueOf,   _intValue);
 290     BASIC_TYPE_CASE(T_LONG,    _Long_valueOf,      _longValue);
 291     BASIC_TYPE_CASE(T_FLOAT,   _Float_valueOf,     _floatValue);
 292     BASIC_TYPE_CASE(T_DOUBLE,  _Double_valueOf,    _doubleValue);
 293 #undef BASIC_TYPE_CASE
 294   }
 295 #undef TYPE2
 296   return vmIntrinsics::_none;
 297 }
 298 
 299 vmIntrinsics::ID vmIntrinsics::for_boxing(BasicType type) {
 300   return wrapper_intrinsic(type, false);
 301 }
 302 vmIntrinsics::ID vmIntrinsics::for_unboxing(BasicType type) {
 303   return wrapper_intrinsic(type, true);
 304 }
 305 
 306 vmIntrinsics::ID vmIntrinsics::for_raw_conversion(BasicType src, BasicType dest) {
 307 #define SRC_DEST(s,d) (((int)(s) << 4) + (int)(d))
 308   switch (SRC_DEST(src, dest)) {
 309   case SRC_DEST(T_INT, T_FLOAT):   return vmIntrinsics::_intBitsToFloat;
 310   case SRC_DEST(T_FLOAT, T_INT):   return vmIntrinsics::_floatToRawIntBits;
 311 
 312   case SRC_DEST(T_LONG, T_DOUBLE): return vmIntrinsics::_longBitsToDouble;
 313   case SRC_DEST(T_DOUBLE, T_LONG): return vmIntrinsics::_doubleToRawLongBits;
 314   }
 315 #undef SRC_DEST
 316 
 317   return vmIntrinsics::_none;
 318 }
 319 
 320 methodOop vmIntrinsics::method_for(vmIntrinsics::ID id) {
 321   if (id == _none)  return NULL;
 322   symbolOop cname = vmSymbols::symbol_at(class_for(id));
 323   symbolOop mname = vmSymbols::symbol_at(name_for(id));
 324   symbolOop msig  = vmSymbols::symbol_at(signature_for(id));
 325   if (cname == NULL || mname == NULL || msig == NULL)  return NULL;
 326   klassOop k = SystemDictionary::find_well_known_klass(cname);
 327   if (k == NULL)  return NULL;
 328   return instanceKlass::cast(k)->find_method(mname, msig);
 329 }
 330 
 331 
 332 #define VM_INTRINSIC_INITIALIZE(id, klass, name, sig, flags) #id "\0"
 333 static const char* vm_intrinsic_name_bodies =
 334   VM_INTRINSICS_DO(VM_INTRINSIC_INITIALIZE,
 335                    VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
 336 
 337 static const char* vm_intrinsic_name_table[vmIntrinsics::ID_LIMIT];
 338 
 339 const char* vmIntrinsics::name_at(vmIntrinsics::ID id) {
 340   const char** nt = &vm_intrinsic_name_table[0];
 341   if (nt[_none] == NULL) {
 342     char* string = (char*) &vm_intrinsic_name_bodies[0];
 343     for (int index = FIRST_ID; index < ID_LIMIT; index++) {
 344       nt[index] = string;
 345       string += strlen(string); // skip string body
 346       string += 1;              // skip trailing null
 347     }
 348     assert(!strcmp(nt[_hashCode], "_hashCode"), "lined up");
 349     nt[_none] = "_none";
 350   }
 351   if ((uint)id < (uint)ID_LIMIT)
 352     return vm_intrinsic_name_table[(uint)id];
 353   else
 354     return "(unknown intrinsic)";
 355 }
 356 
 357 // These are flag-matching functions:
 358 inline bool match_F_R(jshort flags) {
 359   const int req = 0;
 360   const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED;
 361   return (flags & (req | neg)) == req;
 362 }
 363 inline bool match_F_Y(jshort flags) {
 364   const int req = JVM_ACC_SYNCHRONIZED;
 365   const int neg = JVM_ACC_STATIC;
 366   return (flags & (req | neg)) == req;
 367 }
 368 inline bool match_F_RN(jshort flags) {
 369   const int req = JVM_ACC_NATIVE;
 370   const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED;
 371   return (flags & (req | neg)) == req;
 372 }
 373 inline bool match_F_S(jshort flags) {
 374   const int req = JVM_ACC_STATIC;
 375   const int neg = JVM_ACC_SYNCHRONIZED;
 376   return (flags & (req | neg)) == req;
 377 }
 378 inline bool match_F_SN(jshort flags) {
 379   const int req = JVM_ACC_STATIC | JVM_ACC_NATIVE;
 380   const int neg = JVM_ACC_SYNCHRONIZED;
 381   return (flags & (req | neg)) == req;
 382 }
 383 inline bool match_F_RNY(jshort flags) {
 384   const int req = JVM_ACC_NATIVE | JVM_ACC_SYNCHRONIZED;
 385   const int neg = JVM_ACC_STATIC;
 386   return (flags & (req | neg)) == req;
 387 }
 388 
 389 // These are for forming case labels:
 390 #define ID3(x, y, z) (( jlong)(z) +                                  \
 391                       ((jlong)(y) <<    vmSymbols::log2_SID_LIMIT) + \
 392                       ((jlong)(x) << (2*vmSymbols::log2_SID_LIMIT))  )
 393 #define SID_ENUM(n) vmSymbols::VM_SYMBOL_ENUM_NAME(n)
 394 
 395 vmIntrinsics::ID vmIntrinsics::find_id_impl(vmSymbols::SID holder,
 396                                             vmSymbols::SID name,
 397                                             vmSymbols::SID sig,
 398                                             jshort flags) {
 399   assert((int)vmSymbols::SID_LIMIT <= (1<<vmSymbols::log2_SID_LIMIT), "must fit");
 400 
 401   // Let the C compiler build the decision tree.
 402 
 403 #define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
 404   case ID3(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig)): \
 405     if (!match_##fcode(flags))  break; \
 406     return id;
 407 
 408   switch (ID3(holder, name, sig)) {
 409     VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
 410                      VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
 411   }
 412   return vmIntrinsics::_none;
 413 
 414 #undef VM_INTRINSIC_CASE
 415 }
 416 
 417 
 418 const char* vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID id, char* buf, int buflen) {
 419   const char* str = name_at(id);
 420 #ifndef PRODUCT
 421   const char* kname = vmSymbols::name_for(class_for(id));
 422   const char* mname = vmSymbols::name_for(name_for(id));
 423   const char* sname = vmSymbols::name_for(signature_for(id));
 424   const char* fname = "";
 425   switch (flags_for(id)) {
 426   case F_Y:  fname = "synchronized ";  break;
 427   case F_RN: fname = "native ";        break;
 428   case F_SN: fname = "native static "; break;
 429   case F_S:  fname = "static ";        break;
 430   case F_RNY:fname = "native synchronized "; break;
 431   }
 432   const char* kptr = strrchr(kname, '/');
 433   if (kptr != NULL)  kname = kptr + 1;
 434   int len = jio_snprintf(buf, buflen, "%s: %s%s.%s%s",
 435                          str, fname, kname, mname, sname);
 436   if (len < buflen)
 437     str = buf;
 438 #endif //PRODUCT
 439   return str;
 440 }
 441 
 442 
 443 // These are to get information about intrinsics.
 444 
 445 #define ID4(x, y, z, f) ((ID3(x, y, z) << vmIntrinsics::log2_FLAG_LIMIT) | (jlong) (f))
 446 
 447 static const jlong intrinsic_info_array[vmIntrinsics::ID_LIMIT+1] = {
 448 #define VM_INTRINSIC_INFO(ignore_id, klass, name, sig, fcode) \
 449   ID4(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig), vmIntrinsics::fcode),
 450 
 451   0, VM_INTRINSICS_DO(VM_INTRINSIC_INFO,
 452                      VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE)
 453     0
 454 #undef VM_INTRINSIC_INFO
 455 };
 456 
 457 inline jlong intrinsic_info(vmIntrinsics::ID id) {
 458   return intrinsic_info_array[vmIntrinsics::ID_from((int)id)];
 459 }
 460 
 461 vmSymbols::SID vmIntrinsics::class_for(vmIntrinsics::ID id) {
 462   jlong info = intrinsic_info(id);
 463   int shift = 2*vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
 464   assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1021, "");
 465   return vmSymbols::SID( (info >> shift) & mask );
 466 }
 467 
 468 vmSymbols::SID vmIntrinsics::name_for(vmIntrinsics::ID id) {
 469   jlong info = intrinsic_info(id);
 470   int shift = vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
 471   assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1022, "");
 472   return vmSymbols::SID( (info >> shift) & mask );
 473 }
 474 
 475 vmSymbols::SID vmIntrinsics::signature_for(vmIntrinsics::ID id) {
 476   jlong info = intrinsic_info(id);
 477   int shift = log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
 478   assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1023, "");
 479   return vmSymbols::SID( (info >> shift) & mask );
 480 }
 481 
 482 vmIntrinsics::Flags vmIntrinsics::flags_for(vmIntrinsics::ID id) {
 483   jlong info = intrinsic_info(id);
 484   int shift = 0, mask = right_n_bits(log2_FLAG_LIMIT);
 485   assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 15, "");
 486   return Flags( (info >> shift) & mask );
 487 }
 488 
 489 
 490 #ifndef PRODUCT
 491 // verify_method performs an extra check on a matched intrinsic method
 492 
 493 static bool match_method(methodOop m, symbolOop n, symbolOop s) {
 494   return (m->name() == n &&
 495           m->signature() == s);
 496 }
 497 
 498 static vmIntrinsics::ID match_method_with_klass(methodOop m, symbolOop mk) {
 499 #define VM_INTRINSIC_MATCH(id, klassname, namepart, sigpart, flags) \
 500   { symbolOop k = vmSymbols::klassname(); \
 501     if (mk == k) { \
 502       symbolOop n = vmSymbols::namepart(); \
 503       symbolOop s = vmSymbols::sigpart(); \
 504       if (match_method(m, n, s)) \
 505         return vmIntrinsics::id; \
 506     } }
 507   VM_INTRINSICS_DO(VM_INTRINSIC_MATCH,
 508                    VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
 509   return vmIntrinsics::_none;
 510 #undef VM_INTRINSIC_MATCH
 511 }
 512 
 513 void vmIntrinsics::verify_method(ID actual_id, methodOop m) {
 514   symbolOop mk = Klass::cast(m->method_holder())->name();
 515   ID declared_id = match_method_with_klass(m, mk);
 516 
 517   if (declared_id == actual_id)  return; // success
 518 
 519   if (declared_id == _none && actual_id != _none && mk == vmSymbols::java_lang_StrictMath()) {
 520     // Here are a few special cases in StrictMath not declared in vmSymbols.hpp.
 521     switch (actual_id) {
 522     case _min:
 523     case _max:
 524     case _dsqrt:
 525       declared_id = match_method_with_klass(m, vmSymbols::java_lang_Math());
 526       if (declared_id == actual_id)  return; // acceptable alias
 527       break;
 528     }
 529   }
 530 
 531   const char* declared_name = name_at(declared_id);
 532   const char* actual_name   = name_at(actual_id);
 533   methodHandle mh = m;
 534   m = NULL;
 535   ttyLocker ttyl;
 536   if (xtty != NULL) {
 537     xtty->begin_elem("intrinsic_misdeclared actual='%s' declared='%s'",
 538                      actual_name, declared_name);
 539     xtty->method(mh);
 540     xtty->end_elem("");
 541   }
 542   if (PrintMiscellaneous && (WizardMode || Verbose)) {
 543     tty->print_cr("*** misidentified method; %s(%d) should be %s(%d):",
 544                   declared_name, declared_id, actual_name, actual_id);
 545     mh()->print_short_name(tty);
 546     tty->cr();
 547   }
 548 }
 549 #endif //PRODUCT