1 /*
   2  * Copyright (c) 1997, 2019, 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 "asm/codeBuffer.hpp"
  27 #include "asm/macroAssembler.inline.hpp"
  28 #include "memory/resourceArea.hpp"
  29 #include "oops/access.inline.hpp"
  30 #include "oops/oop.inline.hpp"
  31 #include "runtime/interfaceSupport.inline.hpp"
  32 #include "runtime/timerTrace.hpp"
  33 #include "runtime/sharedRuntime.hpp"
  34 #include "runtime/stubRoutines.hpp"
  35 #include "utilities/align.hpp"
  36 #include "utilities/copy.hpp"
  37 #include "utilities/vmError.hpp"
  38 #ifdef COMPILER2
  39 #include "opto/runtime.hpp"
  40 #endif
  41 
  42 UnsafeCopyMemory* UnsafeCopyMemory::_table                      = NULL;
  43 int UnsafeCopyMemory::_table_length                             = 0;
  44 int UnsafeCopyMemory::_table_max_length                         = 0;
  45 address UnsafeCopyMemory::_common_exit_stub_pc                  = NULL;
  46 
  47 // Implementation of StubRoutines - for a description
  48 // of how to extend it, see the header file.
  49 
  50 // Class Variables
  51 
  52 BufferBlob* StubRoutines::_code1                                = NULL;
  53 BufferBlob* StubRoutines::_code2                                = NULL;
  54 
  55 address StubRoutines::_call_stub_return_address                 = NULL;
  56 address StubRoutines::_call_stub_entry                          = NULL;
  57 
  58 address StubRoutines::_catch_exception_entry                    = NULL;
  59 address StubRoutines::_forward_exception_entry                  = NULL;
  60 address StubRoutines::_throw_AbstractMethodError_entry          = NULL;
  61 address StubRoutines::_throw_IncompatibleClassChangeError_entry = NULL;
  62 address StubRoutines::_throw_NullPointerException_at_call_entry = NULL;
  63 address StubRoutines::_throw_StackOverflowError_entry           = NULL;
  64 address StubRoutines::_throw_delayed_StackOverflowError_entry   = NULL;
  65 jint    StubRoutines::_verify_oop_count                         = 0;
  66 address StubRoutines::_verify_oop_subroutine_entry              = NULL;
  67 address StubRoutines::_atomic_xchg_entry                        = NULL;
  68 address StubRoutines::_atomic_xchg_long_entry                   = NULL;
  69 address StubRoutines::_atomic_store_entry                       = NULL;
  70 address StubRoutines::_atomic_cmpxchg_entry                     = NULL;
  71 address StubRoutines::_atomic_cmpxchg_byte_entry                = NULL;
  72 address StubRoutines::_atomic_cmpxchg_long_entry                = NULL;
  73 address StubRoutines::_atomic_add_entry                         = NULL;
  74 address StubRoutines::_atomic_add_long_entry                    = NULL;
  75 address StubRoutines::_fence_entry                              = NULL;
  76 address StubRoutines::_d2i_wrapper                              = NULL;
  77 address StubRoutines::_d2l_wrapper                              = NULL;
  78 
  79 jint    StubRoutines::_fpu_cntrl_wrd_std                        = 0;
  80 jint    StubRoutines::_fpu_cntrl_wrd_24                         = 0;
  81 jint    StubRoutines::_fpu_cntrl_wrd_trunc                      = 0;
  82 jint    StubRoutines::_mxcsr_std                                = 0;
  83 jint    StubRoutines::_fpu_subnormal_bias1[3]                   = { 0, 0, 0 };
  84 jint    StubRoutines::_fpu_subnormal_bias2[3]                   = { 0, 0, 0 };
  85 
  86 // Compiled code entry points default values
  87 // The default functions don't have separate disjoint versions.
  88 address StubRoutines::_jbyte_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);
  89 address StubRoutines::_jshort_arraycopy         = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);
  90 address StubRoutines::_jint_arraycopy           = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
  91 address StubRoutines::_jlong_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);
  92 address StubRoutines::_oop_arraycopy            = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);
  93 address StubRoutines::_oop_arraycopy_uninit     = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);
  94 address StubRoutines::_jbyte_disjoint_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);
  95 address StubRoutines::_jshort_disjoint_arraycopy         = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);
  96 address StubRoutines::_jint_disjoint_arraycopy           = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
  97 address StubRoutines::_jlong_disjoint_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);
  98 address StubRoutines::_oop_disjoint_arraycopy            = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);
  99 address StubRoutines::_oop_disjoint_arraycopy_uninit     = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);
 100 
 101 address StubRoutines::_arrayof_jbyte_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);
 102 address StubRoutines::_arrayof_jshort_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);
 103 address StubRoutines::_arrayof_jint_arraycopy   = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);
 104 address StubRoutines::_arrayof_jlong_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);
 105 address StubRoutines::_arrayof_oop_arraycopy    = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);
 106 address StubRoutines::_arrayof_oop_arraycopy_uninit      = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);
 107 address StubRoutines::_arrayof_jbyte_disjoint_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);
 108 address StubRoutines::_arrayof_jshort_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);
 109 address StubRoutines::_arrayof_jint_disjoint_arraycopy   = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);
 110 address StubRoutines::_arrayof_jlong_disjoint_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);
 111 address StubRoutines::_arrayof_oop_disjoint_arraycopy    = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);
 112 address StubRoutines::_arrayof_oop_disjoint_arraycopy_uninit  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);
 113 
 114 address StubRoutines::_zero_aligned_words = CAST_FROM_FN_PTR(address, Copy::zero_to_words);
 115 
 116 address StubRoutines::_checkcast_arraycopy               = NULL;
 117 address StubRoutines::_checkcast_arraycopy_uninit        = NULL;
 118 address StubRoutines::_unsafe_arraycopy                  = NULL;
 119 address StubRoutines::_generic_arraycopy                 = NULL;
 120 
 121 address StubRoutines::_jbyte_fill;
 122 address StubRoutines::_jshort_fill;
 123 address StubRoutines::_jint_fill;
 124 address StubRoutines::_arrayof_jbyte_fill;
 125 address StubRoutines::_arrayof_jshort_fill;
 126 address StubRoutines::_arrayof_jint_fill;
 127 
 128 address StubRoutines::_aescrypt_encryptBlock               = NULL;
 129 address StubRoutines::_aescrypt_decryptBlock               = NULL;
 130 address StubRoutines::_cipherBlockChaining_encryptAESCrypt = NULL;
 131 address StubRoutines::_cipherBlockChaining_decryptAESCrypt = NULL;
 132 address StubRoutines::_counterMode_AESCrypt                = NULL;
 133 address StubRoutines::_ghash_processBlocks                 = NULL;
 134 address StubRoutines::_base64_encodeBlock                  = NULL;
 135 
 136 address StubRoutines::_sha1_implCompress     = NULL;
 137 address StubRoutines::_sha1_implCompressMB   = NULL;
 138 address StubRoutines::_sha256_implCompress   = NULL;
 139 address StubRoutines::_sha256_implCompressMB = NULL;
 140 address StubRoutines::_sha512_implCompress   = NULL;
 141 address StubRoutines::_sha512_implCompressMB = NULL;
 142 
 143 address StubRoutines::_updateBytesCRC32 = NULL;
 144 address StubRoutines::_crc_table_adr =    NULL;
 145 
 146 address StubRoutines::_crc32c_table_addr = NULL;
 147 address StubRoutines::_updateBytesCRC32C = NULL;
 148 address StubRoutines::_updateBytesAdler32 = NULL;
 149 
 150 address StubRoutines::_multiplyToLen = NULL;
 151 address StubRoutines::_squareToLen = NULL;
 152 address StubRoutines::_mulAdd = NULL;
 153 address StubRoutines::_montgomeryMultiply = NULL;
 154 address StubRoutines::_montgomerySquare = NULL;
 155 
 156 address StubRoutines::_vectorizedMismatch = NULL;
 157 
 158 address StubRoutines::_dexp = NULL;
 159 address StubRoutines::_dlog = NULL;
 160 address StubRoutines::_dlog10 = NULL;
 161 address StubRoutines::_dpow = NULL;
 162 address StubRoutines::_dsin = NULL;
 163 address StubRoutines::_dcos = NULL;
 164 address StubRoutines::_dlibm_sin_cos_huge = NULL;
 165 address StubRoutines::_dlibm_reduce_pi04l = NULL;
 166 address StubRoutines::_dlibm_tan_cot_huge = NULL;
 167 address StubRoutines::_dtan = NULL;
 168 
 169 address StubRoutines::_safefetch32_entry                 = NULL;
 170 address StubRoutines::_safefetch32_fault_pc              = NULL;
 171 address StubRoutines::_safefetch32_continuation_pc       = NULL;
 172 address StubRoutines::_safefetchN_entry                  = NULL;
 173 address StubRoutines::_safefetchN_fault_pc               = NULL;
 174 address StubRoutines::_safefetchN_continuation_pc        = NULL;
 175 
 176 // Initialization
 177 //
 178 // Note: to break cycle with universe initialization, stubs are generated in two phases.
 179 // The first one generates stubs needed during universe init (e.g., _handle_must_compile_first_entry).
 180 // The second phase includes all other stubs (which may depend on universe being initialized.)
 181 
 182 extern void StubGenerator_generate(CodeBuffer* code, bool all); // only interface to generators
 183 
 184 void UnsafeCopyMemory::create_table(int max_size) {
 185   UnsafeCopyMemory::_table = new UnsafeCopyMemory[max_size];
 186   UnsafeCopyMemory::_table_max_length = max_size;
 187 }
 188 
 189 bool UnsafeCopyMemory::contains_pc(address pc) {
 190   for (int i = 0; i < UnsafeCopyMemory::_table_length; i++) {
 191     UnsafeCopyMemory* entry = &UnsafeCopyMemory::_table[i];
 192     if (pc >= entry->start_pc() && pc < entry->end_pc()) {
 193       return true;
 194     }
 195   }
 196   return false;
 197 }
 198 
 199 address UnsafeCopyMemory::page_error_continue_pc(address pc) {
 200   for (int i = 0; i < UnsafeCopyMemory::_table_length; i++) {
 201     UnsafeCopyMemory* entry = &UnsafeCopyMemory::_table[i];
 202     if (pc >= entry->start_pc() && pc < entry->end_pc()) {
 203       return entry->error_exit_pc();
 204     }
 205   }
 206   return NULL;
 207 }
 208 
 209 void StubRoutines::initialize1() {
 210   if (_code1 == NULL) {
 211     ResourceMark rm;
 212     TraceTime timer("StubRoutines generation 1", TRACETIME_LOG(Info, startuptime));
 213     _code1 = BufferBlob::create("StubRoutines (1)", code_size1);
 214     if (_code1 == NULL) {
 215       vm_exit_out_of_memory(code_size1, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (1)");
 216     }
 217     CodeBuffer buffer(_code1);
 218     StubGenerator_generate(&buffer, false);
 219     // When new stubs added we need to make sure there is some space left
 220     // to catch situation when we should increase size again.
 221     assert(code_size1 == 0 || buffer.insts_remaining() > 200, "increase code_size1");
 222   }
 223 }
 224 
 225 
 226 #ifdef ASSERT
 227 typedef void (*arraycopy_fn)(address src, address dst, int count);
 228 
 229 // simple tests of generated arraycopy functions
 230 static void test_arraycopy_func(address func, int alignment) {
 231   int v = 0xcc;
 232   int v2 = 0x11;
 233   jlong lbuffer[8];
 234   jlong lbuffer2[8];
 235   address fbuffer  = (address) lbuffer;
 236   address fbuffer2 = (address) lbuffer2;
 237   unsigned int i;
 238   for (i = 0; i < sizeof(lbuffer); i++) {
 239     fbuffer[i] = v; fbuffer2[i] = v2;
 240   }
 241   // C++ does not guarantee jlong[] array alignment to 8 bytes.
 242   // Use middle of array to check that memory before it is not modified.
 243   address buffer  = align_up((address)&lbuffer[4], BytesPerLong);
 244   address buffer2 = align_up((address)&lbuffer2[4], BytesPerLong);
 245   // do an aligned copy
 246   ((arraycopy_fn)func)(buffer, buffer2, 0);
 247   for (i = 0; i < sizeof(lbuffer); i++) {
 248     assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
 249   }
 250   // adjust destination alignment
 251   ((arraycopy_fn)func)(buffer, buffer2 + alignment, 0);
 252   for (i = 0; i < sizeof(lbuffer); i++) {
 253     assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
 254   }
 255   // adjust source alignment
 256   ((arraycopy_fn)func)(buffer + alignment, buffer2, 0);
 257   for (i = 0; i < sizeof(lbuffer); i++) {
 258     assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
 259   }
 260 }
 261 
 262 // simple test for SafeFetch32
 263 static void test_safefetch32() {
 264   if (CanUseSafeFetch32()) {
 265     int dummy = 17;
 266     int* const p_invalid = (int*) VMError::get_segfault_address();
 267     int* const p_valid = &dummy;
 268     int result_invalid = SafeFetch32(p_invalid, 0xABC);
 269     assert(result_invalid == 0xABC, "SafeFetch32 error");
 270     int result_valid = SafeFetch32(p_valid, 0xABC);
 271     assert(result_valid == 17, "SafeFetch32 error");
 272   }
 273 }
 274 
 275 // simple test for SafeFetchN
 276 static void test_safefetchN() {
 277   if (CanUseSafeFetchN()) {
 278 #ifdef _LP64
 279     const intptr_t v1 = UCONST64(0xABCD00000000ABCD);
 280     const intptr_t v2 = UCONST64(0xDEFD00000000DEFD);
 281 #else
 282     const intptr_t v1 = 0xABCDABCD;
 283     const intptr_t v2 = 0xDEFDDEFD;
 284 #endif
 285     intptr_t dummy = v1;
 286     intptr_t* const p_invalid = (intptr_t*) VMError::get_segfault_address();
 287     intptr_t* const p_valid = &dummy;
 288     intptr_t result_invalid = SafeFetchN(p_invalid, v2);
 289     assert(result_invalid == v2, "SafeFetchN error");
 290     intptr_t result_valid = SafeFetchN(p_valid, v2);
 291     assert(result_valid == v1, "SafeFetchN error");
 292   }
 293 }
 294 #endif
 295 
 296 void StubRoutines::initialize2() {
 297   if (_code2 == NULL) {
 298     ResourceMark rm;
 299     TraceTime timer("StubRoutines generation 2", TRACETIME_LOG(Info, startuptime));
 300     _code2 = BufferBlob::create("StubRoutines (2)", code_size2);
 301     if (_code2 == NULL) {
 302       vm_exit_out_of_memory(code_size2, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (2)");
 303     }
 304     CodeBuffer buffer(_code2);
 305     StubGenerator_generate(&buffer, true);
 306     // When new stubs added we need to make sure there is some space left
 307     // to catch situation when we should increase size again.
 308     assert(code_size2 == 0 || buffer.insts_remaining() > 200, "increase code_size2");
 309   }
 310 
 311 #ifdef ASSERT
 312 
 313 #define TEST_ARRAYCOPY(type)                                                    \
 314   test_arraycopy_func(          type##_arraycopy(),          sizeof(type));     \
 315   test_arraycopy_func(          type##_disjoint_arraycopy(), sizeof(type));     \
 316   test_arraycopy_func(arrayof_##type##_arraycopy(),          sizeof(HeapWord)); \
 317   test_arraycopy_func(arrayof_##type##_disjoint_arraycopy(), sizeof(HeapWord))
 318 
 319   // Make sure all the arraycopy stubs properly handle zero count
 320   TEST_ARRAYCOPY(jbyte);
 321   TEST_ARRAYCOPY(jshort);
 322   TEST_ARRAYCOPY(jint);
 323   TEST_ARRAYCOPY(jlong);
 324 
 325 #undef TEST_ARRAYCOPY
 326 
 327 #define TEST_FILL(type)                                                                      \
 328   if (_##type##_fill != NULL) {                                                              \
 329     union {                                                                                  \
 330       double d;                                                                              \
 331       type body[96];                                                                         \
 332     } s;                                                                                     \
 333                                                                                              \
 334     int v = 32;                                                                              \
 335     for (int offset = -2; offset <= 2; offset++) {                                           \
 336       for (int i = 0; i < 96; i++) {                                                         \
 337         s.body[i] = 1;                                                                       \
 338       }                                                                                      \
 339       type* start = s.body + 8 + offset;                                                     \
 340       for (int aligned = 0; aligned < 2; aligned++) {                                        \
 341         if (aligned) {                                                                       \
 342           if (((intptr_t)start) % HeapWordSize == 0) {                                       \
 343             ((void (*)(type*, int, int))StubRoutines::_arrayof_##type##_fill)(start, v, 80); \
 344           } else {                                                                           \
 345             continue;                                                                        \
 346           }                                                                                  \
 347         } else {                                                                             \
 348           ((void (*)(type*, int, int))StubRoutines::_##type##_fill)(start, v, 80);           \
 349         }                                                                                    \
 350         for (int i = 0; i < 96; i++) {                                                       \
 351           if (i < (8 + offset) || i >= (88 + offset)) {                                      \
 352             assert(s.body[i] == 1, "what?");                                                 \
 353           } else {                                                                           \
 354             assert(s.body[i] == 32, "what?");                                                \
 355           }                                                                                  \
 356         }                                                                                    \
 357       }                                                                                      \
 358     }                                                                                        \
 359   }                                                                                          \
 360 
 361   TEST_FILL(jbyte);
 362   TEST_FILL(jshort);
 363   TEST_FILL(jint);
 364 
 365 #undef TEST_FILL
 366 
 367 #define TEST_COPYRTN(type) \
 368   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_##type##s_atomic),  sizeof(type)); \
 369   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::arrayof_conjoint_##type##s), (int)MAX2(sizeof(HeapWord), sizeof(type)))
 370 
 371   // Make sure all the copy runtime routines properly handle zero count
 372   TEST_COPYRTN(jbyte);
 373   TEST_COPYRTN(jshort);
 374   TEST_COPYRTN(jint);
 375   TEST_COPYRTN(jlong);
 376 
 377 #undef TEST_COPYRTN
 378 
 379   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_words), sizeof(HeapWord));
 380   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words), sizeof(HeapWord));
 381   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words_atomic), sizeof(HeapWord));
 382   // Aligned to BytesPerLong
 383   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_conjoint_words), sizeof(jlong));
 384   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_disjoint_words), sizeof(jlong));
 385 
 386   // test safefetch routines
 387   // Not on Windows 32bit until 8074860 is fixed
 388 #if ! (defined(_WIN32) && defined(_M_IX86))
 389   test_safefetch32();
 390   test_safefetchN();
 391 #endif
 392 
 393 #endif
 394 }
 395 
 396 
 397 void stubRoutines_init1() { StubRoutines::initialize1(); }
 398 void stubRoutines_init2() { StubRoutines::initialize2(); }
 399 
 400 //
 401 // Default versions of arraycopy functions
 402 //
 403 
 404 JRT_LEAF(void, StubRoutines::jbyte_copy(jbyte* src, jbyte* dest, size_t count))
 405 #ifndef PRODUCT
 406   SharedRuntime::_jbyte_array_copy_ctr++;      // Slow-path byte array copy
 407 #endif // !PRODUCT
 408   Copy::conjoint_jbytes_atomic(src, dest, count);
 409 JRT_END
 410 
 411 JRT_LEAF(void, StubRoutines::jshort_copy(jshort* src, jshort* dest, size_t count))
 412 #ifndef PRODUCT
 413   SharedRuntime::_jshort_array_copy_ctr++;     // Slow-path short/char array copy
 414 #endif // !PRODUCT
 415   Copy::conjoint_jshorts_atomic(src, dest, count);
 416 JRT_END
 417 
 418 JRT_LEAF(void, StubRoutines::jint_copy(jint* src, jint* dest, size_t count))
 419 #ifndef PRODUCT
 420   SharedRuntime::_jint_array_copy_ctr++;       // Slow-path int/float array copy
 421 #endif // !PRODUCT
 422   Copy::conjoint_jints_atomic(src, dest, count);
 423 JRT_END
 424 
 425 JRT_LEAF(void, StubRoutines::jlong_copy(jlong* src, jlong* dest, size_t count))
 426 #ifndef PRODUCT
 427   SharedRuntime::_jlong_array_copy_ctr++;      // Slow-path long/double array copy
 428 #endif // !PRODUCT
 429   Copy::conjoint_jlongs_atomic(src, dest, count);
 430 JRT_END
 431 
 432 JRT_LEAF(void, StubRoutines::oop_copy(oop* src, oop* dest, size_t count))
 433 #ifndef PRODUCT
 434   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
 435 #endif // !PRODUCT
 436   assert(count != 0, "count should be non-zero");
 437   ArrayAccess<>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);
 438 JRT_END
 439 
 440 JRT_LEAF(void, StubRoutines::oop_copy_uninit(oop* src, oop* dest, size_t count))
 441 #ifndef PRODUCT
 442   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
 443 #endif // !PRODUCT
 444   assert(count != 0, "count should be non-zero");
 445   ArrayAccess<IS_DEST_UNINITIALIZED>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);
 446 JRT_END
 447 
 448 JRT_LEAF(void, StubRoutines::arrayof_jbyte_copy(HeapWord* src, HeapWord* dest, size_t count))
 449 #ifndef PRODUCT
 450   SharedRuntime::_jbyte_array_copy_ctr++;      // Slow-path byte array copy
 451 #endif // !PRODUCT
 452   Copy::arrayof_conjoint_jbytes(src, dest, count);
 453 JRT_END
 454 
 455 JRT_LEAF(void, StubRoutines::arrayof_jshort_copy(HeapWord* src, HeapWord* dest, size_t count))
 456 #ifndef PRODUCT
 457   SharedRuntime::_jshort_array_copy_ctr++;     // Slow-path short/char array copy
 458 #endif // !PRODUCT
 459   Copy::arrayof_conjoint_jshorts(src, dest, count);
 460 JRT_END
 461 
 462 JRT_LEAF(void, StubRoutines::arrayof_jint_copy(HeapWord* src, HeapWord* dest, size_t count))
 463 #ifndef PRODUCT
 464   SharedRuntime::_jint_array_copy_ctr++;       // Slow-path int/float array copy
 465 #endif // !PRODUCT
 466   Copy::arrayof_conjoint_jints(src, dest, count);
 467 JRT_END
 468 
 469 JRT_LEAF(void, StubRoutines::arrayof_jlong_copy(HeapWord* src, HeapWord* dest, size_t count))
 470 #ifndef PRODUCT
 471   SharedRuntime::_jlong_array_copy_ctr++;       // Slow-path int/float array copy
 472 #endif // !PRODUCT
 473   Copy::arrayof_conjoint_jlongs(src, dest, count);
 474 JRT_END
 475 
 476 JRT_LEAF(void, StubRoutines::arrayof_oop_copy(HeapWord* src, HeapWord* dest, size_t count))
 477 #ifndef PRODUCT
 478   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
 479 #endif // !PRODUCT
 480   assert(count != 0, "count should be non-zero");
 481   ArrayAccess<ARRAYCOPY_ARRAYOF>::oop_arraycopy_raw(src, dest, count);
 482 JRT_END
 483 
 484 JRT_LEAF(void, StubRoutines::arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count))
 485 #ifndef PRODUCT
 486   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
 487 #endif // !PRODUCT
 488   assert(count != 0, "count should be non-zero");
 489   ArrayAccess<ARRAYCOPY_ARRAYOF | IS_DEST_UNINITIALIZED>::oop_arraycopy_raw(src, dest, count);
 490 JRT_END
 491 
 492 address StubRoutines::select_fill_function(BasicType t, bool aligned, const char* &name) {
 493 #define RETURN_STUB(xxx_fill) { \
 494   name = #xxx_fill; \
 495   return StubRoutines::xxx_fill(); }
 496 
 497   switch (t) {
 498   case T_BYTE:
 499   case T_BOOLEAN:
 500     if (!aligned) RETURN_STUB(jbyte_fill);
 501     RETURN_STUB(arrayof_jbyte_fill);
 502   case T_CHAR:
 503   case T_SHORT:
 504     if (!aligned) RETURN_STUB(jshort_fill);
 505     RETURN_STUB(arrayof_jshort_fill);
 506   case T_INT:
 507   case T_FLOAT:
 508     if (!aligned) RETURN_STUB(jint_fill);
 509     RETURN_STUB(arrayof_jint_fill);
 510   case T_DOUBLE:
 511   case T_LONG:
 512   case T_ARRAY:
 513   case T_OBJECT:
 514   case T_NARROWOOP:
 515   case T_NARROWKLASS:
 516   case T_ADDRESS:
 517     // Currently unsupported
 518     return NULL;
 519 
 520   default:
 521     ShouldNotReachHere();
 522     return NULL;
 523   }
 524 
 525 #undef RETURN_STUB
 526 }
 527 
 528 // constants for computing the copy function
 529 enum {
 530   COPYFUNC_UNALIGNED = 0,
 531   COPYFUNC_ALIGNED = 1,                 // src, dest aligned to HeapWordSize
 532   COPYFUNC_CONJOINT = 0,
 533   COPYFUNC_DISJOINT = 2                 // src != dest, or transfer can descend
 534 };
 535 
 536 // Note:  The condition "disjoint" applies also for overlapping copies
 537 // where an descending copy is permitted (i.e., dest_offset <= src_offset).
 538 address
 539 StubRoutines::select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name, bool dest_uninitialized) {
 540   int selector =
 541     (aligned  ? COPYFUNC_ALIGNED  : COPYFUNC_UNALIGNED) +
 542     (disjoint ? COPYFUNC_DISJOINT : COPYFUNC_CONJOINT);
 543 
 544 #define RETURN_STUB(xxx_arraycopy) { \
 545   name = #xxx_arraycopy; \
 546   return StubRoutines::xxx_arraycopy(); }
 547 
 548 #define RETURN_STUB_PARM(xxx_arraycopy, parm) {           \
 549   name = #xxx_arraycopy; \
 550   return StubRoutines::xxx_arraycopy(parm); }
 551 
 552   switch (t) {
 553   case T_BYTE:
 554   case T_BOOLEAN:
 555     switch (selector) {
 556     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jbyte_arraycopy);
 557     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jbyte_arraycopy);
 558     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jbyte_disjoint_arraycopy);
 559     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jbyte_disjoint_arraycopy);
 560     }
 561   case T_CHAR:
 562   case T_SHORT:
 563     switch (selector) {
 564     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jshort_arraycopy);
 565     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jshort_arraycopy);
 566     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jshort_disjoint_arraycopy);
 567     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jshort_disjoint_arraycopy);
 568     }
 569   case T_INT:
 570   case T_FLOAT:
 571     switch (selector) {
 572     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jint_arraycopy);
 573     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jint_arraycopy);
 574     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jint_disjoint_arraycopy);
 575     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jint_disjoint_arraycopy);
 576     }
 577   case T_DOUBLE:
 578   case T_LONG:
 579     switch (selector) {
 580     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jlong_arraycopy);
 581     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jlong_arraycopy);
 582     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jlong_disjoint_arraycopy);
 583     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jlong_disjoint_arraycopy);
 584     }
 585   case T_ARRAY:
 586   case T_OBJECT:
 587     switch (selector) {
 588     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB_PARM(oop_arraycopy, dest_uninitialized);
 589     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB_PARM(arrayof_oop_arraycopy, dest_uninitialized);
 590     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB_PARM(oop_disjoint_arraycopy, dest_uninitialized);
 591     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB_PARM(arrayof_oop_disjoint_arraycopy, dest_uninitialized);
 592     }
 593   default:
 594     ShouldNotReachHere();
 595     return NULL;
 596   }
 597 
 598 #undef RETURN_STUB
 599 #undef RETURN_STUB_PARM
 600 }
 601 
 602 UnsafeCopyMemoryMark::UnsafeCopyMemoryMark(StubCodeGenerator* cgen, bool add_entry, bool continue_at_scope_end, address error_exit_pc) {
 603   _cgen = cgen;
 604   _ucm_entry = NULL;
 605   if (add_entry) {
 606     address err_exit_pc = NULL;
 607     if (!continue_at_scope_end) {
 608       err_exit_pc = error_exit_pc != NULL ? error_exit_pc : UnsafeCopyMemory::common_exit_stub_pc();
 609     }
 610     assert(err_exit_pc != NULL || continue_at_scope_end, "error exit not set");
 611     _ucm_entry = UnsafeCopyMemory::add_to_table(_cgen->assembler()->pc(), NULL, err_exit_pc);
 612   }
 613 }
 614 
 615 UnsafeCopyMemoryMark::~UnsafeCopyMemoryMark() {
 616   if (_ucm_entry != NULL) {
 617     _ucm_entry->set_end_pc(_cgen->assembler()->pc());
 618     if (_ucm_entry->error_exit_pc() == NULL) {
 619       _ucm_entry->set_error_exit_pc(_cgen->assembler()->pc());
 620     }
 621   }
 622 }