1 /*
2 * Copyright (c) 1997, 2024, 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 #ifndef SHARE_RUNTIME_STUBROUTINES_HPP
26 #define SHARE_RUNTIME_STUBROUTINES_HPP
27
28 #include "code/codeBlob.hpp"
29 #include "memory/allocation.hpp"
30 #include "prims/vectorSupport.hpp"
31 #include "runtime/frame.hpp"
32 #include "runtime/mutexLocker.hpp"
33 #include "runtime/stubCodeGenerator.hpp"
34 #include "runtime/threadWXSetters.inline.hpp"
35 #include "utilities/macros.hpp"
36
37 // StubRoutines provides entry points to assembly routines used by
38 // compiled code and the run-time system. Platform-specific entry
39 // points are defined in the platform-specific inner class.
40 //
41 // Class scheme:
42 //
43 // platform-independent platform-dependent
44 //
45 // stubRoutines.hpp <-- included -- stubRoutines_<arch>.hpp
46 // ^ ^
47 // | |
48 // implements implements
49 // | |
50 // | |
51 // stubRoutines.cpp stubRoutines_<arch>.cpp
52 // stubRoutines_<os_family>.cpp stubGenerator_<arch>.cpp
53 // stubRoutines_<os_arch>.cpp
54 //
55 // Note 1: The important thing is a clean decoupling between stub
56 // entry points (interfacing to the whole vm; i.e., 1-to-n
57 // relationship) and stub generators (interfacing only to
58 // the entry points implementation; i.e., 1-to-1 relationship).
59 // This significantly simplifies changes in the generator
60 // structure since the rest of the vm is not affected.
61 //
62 // Note 2: stubGenerator_<arch>.cpp contains a minimal portion of
63 // machine-independent code; namely the generator calls of
64 // the generator functions that are used platform-independently.
65 // However, it comes with the advantage of having a 1-file
66 // implementation of the generator. It should be fairly easy
67 // to change, should it become a problem later.
68 //
69 // Scheme for adding a new entry point:
70 //
71 // 1. determine if it's a platform-dependent or independent entry point
72 // a) if platform independent: make subsequent changes in the independent files
73 // b) if platform dependent: make subsequent changes in the dependent files
74 // 2. add a private instance variable holding the entry point address
75 // 3. add a public accessor function to the instance variable
76 // 4. implement the corresponding generator function in the platform-dependent
77 // stubGenerator_<arch>.cpp file and call the function in generate_all() of that file
78
79 class UnsafeMemoryAccess : public CHeapObj<mtCode> {
80 private:
81 address _start_pc;
82 address _end_pc;
83 address _error_exit_pc;
84 public:
85 static address _common_exit_stub_pc;
86 static UnsafeMemoryAccess* _table;
87 static int _table_length;
88 static int _table_max_length;
89 UnsafeMemoryAccess() : _start_pc(nullptr), _end_pc(nullptr), _error_exit_pc(nullptr) {}
90 void set_start_pc(address pc) { _start_pc = pc; }
91 void set_end_pc(address pc) { _end_pc = pc; }
92 void set_error_exit_pc(address pc) { _error_exit_pc = pc; }
93 address start_pc() const { return _start_pc; }
94 address end_pc() const { return _end_pc; }
95 address error_exit_pc() const { return _error_exit_pc; }
96
97 static void set_common_exit_stub_pc(address pc) { _common_exit_stub_pc = pc; }
98 static address common_exit_stub_pc() { return _common_exit_stub_pc; }
99
100 static UnsafeMemoryAccess* add_to_table(address start_pc, address end_pc, address error_exit_pc) {
101 guarantee(_table_length < _table_max_length, "Incorrect UnsafeMemoryAccess::_table_max_length");
102 UnsafeMemoryAccess* entry = &_table[_table_length];
103 entry->set_start_pc(start_pc);
104 entry->set_end_pc(end_pc);
105 entry->set_error_exit_pc(error_exit_pc);
106
107 _table_length++;
108 return entry;
109 }
110
111 static bool contains_pc(address pc);
112 static address page_error_continue_pc(address pc);
113 static void create_table(int max_size);
114 };
115
116 class UnsafeMemoryAccessMark : public StackObj {
117 private:
118 UnsafeMemoryAccess* _ucm_entry;
119 StubCodeGenerator* _cgen;
120 public:
121 UnsafeMemoryAccessMark(StubCodeGenerator* cgen, bool add_entry, bool continue_at_scope_end, address error_exit_pc = nullptr);
122 ~UnsafeMemoryAccessMark();
123 };
124
125 class StubRoutines: AllStatic {
126
127 public:
128 // Dependencies
129 friend class StubGenerator;
130
131 #include CPU_HEADER(stubRoutines)
132
133 static jint _verify_oop_count;
134 static address _verify_oop_subroutine_entry;
135
136 static address _call_stub_return_address; // the return PC, when returning to a call stub
137 static address _call_stub_entry;
138 static address _forward_exception_entry;
139 static address _catch_exception_entry;
140 static address _throw_AbstractMethodError_entry;
141 static address _throw_IncompatibleClassChangeError_entry;
142 static address _throw_NullPointerException_at_call_entry;
143 static address _throw_StackOverflowError_entry;
144 static address _throw_delayed_StackOverflowError_entry;
145
146 static address _atomic_xchg_entry;
147 static address _atomic_cmpxchg_entry;
148 static address _atomic_cmpxchg_long_entry;
149 static address _atomic_add_entry;
150 static address _fence_entry;
151
152 static BufferBlob* _initial_stubs_code; // code buffer for initial routines
153 static BufferBlob* _continuation_stubs_code; // code buffer for continuation stubs
154 static BufferBlob* _compiler_stubs_code; // code buffer for C2 intrinsics
155 static BufferBlob* _final_stubs_code; // code buffer for all other routines
156
157 static address _array_sort;
158 static address _array_partition;
159 // Leaf routines which implement arraycopy and their addresses
160 // arraycopy operands aligned on element type boundary
161 static address _jbyte_arraycopy;
162 static address _jshort_arraycopy;
163 static address _jint_arraycopy;
164 static address _jlong_arraycopy;
165 static address _oop_arraycopy, _oop_arraycopy_uninit;
166 static address _jbyte_disjoint_arraycopy;
167 static address _jshort_disjoint_arraycopy;
168 static address _jint_disjoint_arraycopy;
169 static address _jlong_disjoint_arraycopy;
170 static address _oop_disjoint_arraycopy, _oop_disjoint_arraycopy_uninit;
171
172 // arraycopy operands aligned on zero'th element boundary
173 // These are identical to the ones aligned aligned on an
174 // element type boundary, except that they assume that both
175 // source and destination are HeapWord aligned.
176 static address _arrayof_jbyte_arraycopy;
177 static address _arrayof_jshort_arraycopy;
178 static address _arrayof_jint_arraycopy;
179 static address _arrayof_jlong_arraycopy;
180 static address _arrayof_oop_arraycopy, _arrayof_oop_arraycopy_uninit;
181 static address _arrayof_jbyte_disjoint_arraycopy;
182 static address _arrayof_jshort_disjoint_arraycopy;
183 static address _arrayof_jint_disjoint_arraycopy;
184 static address _arrayof_jlong_disjoint_arraycopy;
185 static address _arrayof_oop_disjoint_arraycopy, _arrayof_oop_disjoint_arraycopy_uninit;
186
187 // cache line writeback
188 static address _data_cache_writeback;
189 static address _data_cache_writeback_sync;
190
191 // these are recommended but optional:
192 static address _checkcast_arraycopy, _checkcast_arraycopy_uninit;
193 static address _unsafe_arraycopy;
194 static address _generic_arraycopy;
195
196 static address _unsafe_setmemory;
197
198 static address _jbyte_fill;
199 static address _jshort_fill;
200 static address _jint_fill;
201 static address _arrayof_jbyte_fill;
202 static address _arrayof_jshort_fill;
203 static address _arrayof_jint_fill;
204
205 static address _aescrypt_encryptBlock;
206 static address _aescrypt_decryptBlock;
207 static address _cipherBlockChaining_encryptAESCrypt;
208 static address _cipherBlockChaining_decryptAESCrypt;
209 static address _electronicCodeBook_encryptAESCrypt;
210 static address _electronicCodeBook_decryptAESCrypt;
211 static address _counterMode_AESCrypt;
212 static address _galoisCounterMode_AESCrypt;
213 static address _ghash_processBlocks;
214 static address _chacha20Block;
215 static address _base64_encodeBlock;
216 static address _base64_decodeBlock;
217 static address _poly1305_processBlocks;
218
219 static address _md5_implCompress;
220 static address _md5_implCompressMB;
221 static address _sha1_implCompress;
222 static address _sha1_implCompressMB;
223 static address _sha256_implCompress;
224 static address _sha256_implCompressMB;
225 static address _sha512_implCompress;
226 static address _sha512_implCompressMB;
227 static address _sha3_implCompress;
228 static address _sha3_implCompressMB;
229
230 static address _updateBytesCRC32;
231 static address _crc_table_adr;
232
233 static address _crc32c_table_addr;
234 static address _updateBytesCRC32C;
235 static address _updateBytesAdler32;
236
237 static address _multiplyToLen;
238 static address _squareToLen;
239 static address _mulAdd;
240 static address _montgomeryMultiply;
241 static address _montgomerySquare;
242 static address _bigIntegerRightShiftWorker;
243 static address _bigIntegerLeftShiftWorker;
244
245 static address _vectorizedMismatch;
246
247 static address _dexp;
248 static address _dlog;
249 static address _dlog10;
250 static address _dpow;
251 static address _dsin;
252 static address _dcos;
253 static address _dlibm_sin_cos_huge;
254 static address _dlibm_reduce_pi04l;
255 static address _dlibm_tan_cot_huge;
256 static address _dtan;
257 static address _fmod;
258
259 static address _f2hf;
260 static address _hf2f;
261
262 static address _method_entry_barrier;
263
264 static address _cont_thaw;
265 static address _cont_returnBarrier;
266 static address _cont_returnBarrierExc;
267
268 JFR_ONLY(static RuntimeStub* _jfr_write_checkpoint_stub;)
269 JFR_ONLY(static address _jfr_write_checkpoint;)
270 JFR_ONLY(static RuntimeStub* _jfr_return_lease_stub;)
271 JFR_ONLY(static address _jfr_return_lease;)
272
273 // Vector Math Routines
274 static address _vector_f_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_SVML_OP];
275 static address _vector_d_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_SVML_OP];
276
277 static address _upcall_stub_exception_handler;
278
279 static address _lookup_secondary_supers_table_stubs[];
280 static address _lookup_secondary_supers_table_slow_path_stub;
281
282 public:
283 // Initialization/Testing
284 static void initialize_initial_stubs(); // must happen before universe::genesis
285 static void initialize_continuation_stubs(); // must happen after universe::genesis
286 static void initialize_compiler_stubs(); // must happen after universe::genesis
287 static void initialize_final_stubs(); // must happen after universe::genesis
288
289 static bool is_stub_code(address addr) { return contains(addr); }
290
291 static bool contains(address addr) {
292 return
293 (_initial_stubs_code != nullptr && _initial_stubs_code->blob_contains(addr)) ||
294 (_continuation_stubs_code != nullptr && _continuation_stubs_code->blob_contains(addr)) ||
295 (_compiler_stubs_code != nullptr && _compiler_stubs_code->blob_contains(addr)) ||
296 (_final_stubs_code != nullptr && _final_stubs_code->blob_contains(addr)) ;
297 }
298
299 static RuntimeBlob* initial_stubs_code() { return _initial_stubs_code; }
300 static RuntimeBlob* continuation_stubs_code() { return _continuation_stubs_code; }
301 static RuntimeBlob* compiler_stubs_code() { return _compiler_stubs_code; }
302 static RuntimeBlob* final_stubs_code() { return _final_stubs_code; }
303
304 // Debugging
305 static jint verify_oop_count() { return _verify_oop_count; }
306 static jint* verify_oop_count_addr() { return &_verify_oop_count; }
307 // a subroutine for debugging the GC
308 static address verify_oop_subroutine_entry_address() { return (address)&_verify_oop_subroutine_entry; }
309
310 static address catch_exception_entry() { return _catch_exception_entry; }
311
312 // Calls to Java
313 typedef void (*CallStub)(
314 address link,
315 intptr_t* result,
316 int result_type, /* BasicType on 4 bytes */
317 Method* method,
318 address entry_point,
319 intptr_t* parameters,
320 int size_of_parameters,
321 TRAPS
322 );
323
324 static CallStub call_stub() { return CAST_TO_FN_PTR(CallStub, _call_stub_entry); }
325
326 // Exceptions
327 static address forward_exception_entry() { return _forward_exception_entry; }
328 // Implicit exceptions
329 static address throw_AbstractMethodError_entry() { return _throw_AbstractMethodError_entry; }
330 static address throw_IncompatibleClassChangeError_entry(){ return _throw_IncompatibleClassChangeError_entry; }
331 static address throw_NullPointerException_at_call_entry(){ return _throw_NullPointerException_at_call_entry; }
332 static address throw_StackOverflowError_entry() { return _throw_StackOverflowError_entry; }
333 static address throw_delayed_StackOverflowError_entry() { return _throw_delayed_StackOverflowError_entry; }
334
335 static address atomic_xchg_entry() { return _atomic_xchg_entry; }
336 static address atomic_cmpxchg_entry() { return _atomic_cmpxchg_entry; }
337 static address atomic_cmpxchg_long_entry() { return _atomic_cmpxchg_long_entry; }
338 static address atomic_add_entry() { return _atomic_add_entry; }
339 static address fence_entry() { return _fence_entry; }
340
341 static address select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name, bool dest_uninitialized);
342
343 static address jbyte_arraycopy() { return _jbyte_arraycopy; }
344 static address jshort_arraycopy() { return _jshort_arraycopy; }
345 static address jint_arraycopy() { return _jint_arraycopy; }
346 static address jlong_arraycopy() { return _jlong_arraycopy; }
347 static address oop_arraycopy(bool dest_uninitialized = false) {
348 return dest_uninitialized ? _oop_arraycopy_uninit : _oop_arraycopy;
349 }
350 static address jbyte_disjoint_arraycopy() { return _jbyte_disjoint_arraycopy; }
351 static address jshort_disjoint_arraycopy() { return _jshort_disjoint_arraycopy; }
352 static address jint_disjoint_arraycopy() { return _jint_disjoint_arraycopy; }
353 static address jlong_disjoint_arraycopy() { return _jlong_disjoint_arraycopy; }
354 static address oop_disjoint_arraycopy(bool dest_uninitialized = false) {
355 return dest_uninitialized ? _oop_disjoint_arraycopy_uninit : _oop_disjoint_arraycopy;
356 }
357
358 static address arrayof_jbyte_arraycopy() { return _arrayof_jbyte_arraycopy; }
359 static address arrayof_jshort_arraycopy() { return _arrayof_jshort_arraycopy; }
360 static address arrayof_jint_arraycopy() { return _arrayof_jint_arraycopy; }
361 static address arrayof_jlong_arraycopy() { return _arrayof_jlong_arraycopy; }
362 static address arrayof_oop_arraycopy(bool dest_uninitialized = false) {
363 return dest_uninitialized ? _arrayof_oop_arraycopy_uninit : _arrayof_oop_arraycopy;
364 }
365
366 static address arrayof_jbyte_disjoint_arraycopy() { return _arrayof_jbyte_disjoint_arraycopy; }
367 static address arrayof_jshort_disjoint_arraycopy() { return _arrayof_jshort_disjoint_arraycopy; }
368 static address arrayof_jint_disjoint_arraycopy() { return _arrayof_jint_disjoint_arraycopy; }
369 static address arrayof_jlong_disjoint_arraycopy() { return _arrayof_jlong_disjoint_arraycopy; }
370 static address arrayof_oop_disjoint_arraycopy(bool dest_uninitialized = false) {
371 return dest_uninitialized ? _arrayof_oop_disjoint_arraycopy_uninit : _arrayof_oop_disjoint_arraycopy;
372 }
373 static address data_cache_writeback() { return _data_cache_writeback; }
374 static address data_cache_writeback_sync() { return _data_cache_writeback_sync; }
375
376 typedef void (*DataCacheWritebackStub)(void *);
377 static DataCacheWritebackStub DataCacheWriteback_stub() { return CAST_TO_FN_PTR(DataCacheWritebackStub, _data_cache_writeback); }
378 typedef void (*DataCacheWritebackSyncStub)(bool);
379 static DataCacheWritebackSyncStub DataCacheWritebackSync_stub() { return CAST_TO_FN_PTR(DataCacheWritebackSyncStub, _data_cache_writeback_sync); }
380
381 static address checkcast_arraycopy(bool dest_uninitialized = false) {
382 return dest_uninitialized ? _checkcast_arraycopy_uninit : _checkcast_arraycopy;
383 }
384 static address unsafe_arraycopy() { return _unsafe_arraycopy; }
385
386 typedef void (*UnsafeArrayCopyStub)(const void* src, void* dst, size_t count);
387 static UnsafeArrayCopyStub UnsafeArrayCopy_stub() { return CAST_TO_FN_PTR(UnsafeArrayCopyStub, _unsafe_arraycopy); }
388
389 static address unsafe_setmemory() { return _unsafe_setmemory; }
390
391 typedef void (*UnsafeSetMemoryStub)(const void* src, size_t count, char byte);
392 static UnsafeSetMemoryStub UnsafeSetMemory_stub() { return CAST_TO_FN_PTR(UnsafeSetMemoryStub, _unsafe_setmemory); }
393
394 static address generic_arraycopy() { return _generic_arraycopy; }
395 static address select_arraysort_function() { return _array_sort; }
396 static address select_array_partition_function() { return _array_partition; }
397
398 static address jbyte_fill() { return _jbyte_fill; }
399 static address jshort_fill() { return _jshort_fill; }
400 static address jint_fill() { return _jint_fill; }
401 static address arrayof_jbyte_fill() { return _arrayof_jbyte_fill; }
402 static address arrayof_jshort_fill() { return _arrayof_jshort_fill; }
403 static address arrayof_jint_fill() { return _arrayof_jint_fill; }
404
405 static address aescrypt_encryptBlock() { return _aescrypt_encryptBlock; }
406 static address aescrypt_decryptBlock() { return _aescrypt_decryptBlock; }
407 static address cipherBlockChaining_encryptAESCrypt() { return _cipherBlockChaining_encryptAESCrypt; }
408 static address cipherBlockChaining_decryptAESCrypt() { return _cipherBlockChaining_decryptAESCrypt; }
409 static address electronicCodeBook_encryptAESCrypt() { return _electronicCodeBook_encryptAESCrypt; }
410 static address electronicCodeBook_decryptAESCrypt() { return _electronicCodeBook_decryptAESCrypt; }
411 static address poly1305_processBlocks() { return _poly1305_processBlocks; }
412 static address counterMode_AESCrypt() { return _counterMode_AESCrypt; }
413 static address ghash_processBlocks() { return _ghash_processBlocks; }
414 static address chacha20Block() { return _chacha20Block; }
415 static address base64_encodeBlock() { return _base64_encodeBlock; }
416 static address base64_decodeBlock() { return _base64_decodeBlock; }
417 static address md5_implCompress() { return _md5_implCompress; }
418 static address md5_implCompressMB() { return _md5_implCompressMB; }
419 static address sha1_implCompress() { return _sha1_implCompress; }
420 static address sha1_implCompressMB() { return _sha1_implCompressMB; }
421 static address sha256_implCompress() { return _sha256_implCompress; }
422 static address sha256_implCompressMB() { return _sha256_implCompressMB; }
423 static address sha512_implCompress() { return _sha512_implCompress; }
424 static address sha512_implCompressMB() { return _sha512_implCompressMB; }
425 static address sha3_implCompress() { return _sha3_implCompress; }
426 static address sha3_implCompressMB() { return _sha3_implCompressMB; }
427
428 static address updateBytesCRC32() { return _updateBytesCRC32; }
429 static address crc_table_addr() { return _crc_table_adr; }
430
431 static address crc32c_table_addr() { return _crc32c_table_addr; }
432 static address updateBytesCRC32C() { return _updateBytesCRC32C; }
433 static address updateBytesAdler32() { return _updateBytesAdler32; }
434
435 static address multiplyToLen() { return _multiplyToLen; }
436 static address squareToLen() { return _squareToLen; }
437 static address mulAdd() { return _mulAdd; }
438 static address montgomeryMultiply() { return _montgomeryMultiply; }
439 static address montgomerySquare() { return _montgomerySquare; }
440 static address bigIntegerRightShift() { return _bigIntegerRightShiftWorker; }
441 static address bigIntegerLeftShift() { return _bigIntegerLeftShiftWorker; }
442 static address galoisCounterMode_AESCrypt() { return _galoisCounterMode_AESCrypt; }
443
444 static address vectorizedMismatch() { return _vectorizedMismatch; }
445
446 static address dexp() { return _dexp; }
447 static address dlog() { return _dlog; }
448 static address dlog10() { return _dlog10; }
449 static address dpow() { return _dpow; }
450 static address fmod() { return _fmod; }
451 static address dsin() { return _dsin; }
452 static address dcos() { return _dcos; }
453 static address dlibm_reduce_pi04l() { return _dlibm_reduce_pi04l; }
454 static address dlibm_sin_cos_huge() { return _dlibm_sin_cos_huge; }
455 static address dlibm_tan_cot_huge() { return _dlibm_tan_cot_huge; }
456 static address dtan() { return _dtan; }
457
458 // These are versions of the java.lang.Float::floatToFloat16() and float16ToFloat()
459 // methods which perform the same operations as the intrinsic version.
460 // They are used for constant folding in JIT compiler to ensure equivalence.
461 //
462 static address f2hf_adr() { return _f2hf; }
463 static address hf2f_adr() { return _hf2f; }
464
465 static jshort f2hf(jfloat x) {
466 assert(_f2hf != nullptr, "stub is not implemented on this platform");
467 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXExec, Thread::current());) // About to call into code cache
468 typedef jshort (*f2hf_stub_t)(jfloat x);
469 return ((f2hf_stub_t)_f2hf)(x);
470 }
471 static jfloat hf2f(jshort x) {
472 assert(_hf2f != nullptr, "stub is not implemented on this platform");
473 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXExec, Thread::current());) // About to call into code cache
474 typedef jfloat (*hf2f_stub_t)(jshort x);
475 return ((hf2f_stub_t)_hf2f)(x);
476 }
477
478 static address method_entry_barrier() { return _method_entry_barrier; }
479
480 static address cont_thaw() { return _cont_thaw; }
481 static address cont_returnBarrier() { return _cont_returnBarrier; }
482 static address cont_returnBarrierExc(){return _cont_returnBarrierExc; }
483
484 JFR_ONLY(static address jfr_write_checkpoint() { return _jfr_write_checkpoint; })
485 JFR_ONLY(static address jfr_return_lease() { return _jfr_return_lease; })
486
487 static address upcall_stub_exception_handler() {
488 assert(_upcall_stub_exception_handler != nullptr, "not implemented");
489 return _upcall_stub_exception_handler;
490 }
491
492 static address lookup_secondary_supers_table_stub(u1 slot) {
493 assert(slot < Klass::SECONDARY_SUPERS_TABLE_SIZE, "out of bounds");
494 assert(_lookup_secondary_supers_table_stubs[slot] != nullptr, "not implemented");
495 return _lookup_secondary_supers_table_stubs[slot];
496 }
497
498 static address lookup_secondary_supers_table_slow_path_stub() {
499 assert(_lookup_secondary_supers_table_slow_path_stub != nullptr, "not implemented");
500 return _lookup_secondary_supers_table_slow_path_stub;
501 }
502
503 static address select_fill_function(BasicType t, bool aligned, const char* &name);
504
505 //
506 // Default versions of the above arraycopy functions for platforms which do
507 // not have specialized versions
508 //
509 static void jbyte_copy (jbyte* src, jbyte* dest, size_t count);
510 static void jshort_copy (jshort* src, jshort* dest, size_t count);
511 static void jint_copy (jint* src, jint* dest, size_t count);
512 static void jlong_copy (jlong* src, jlong* dest, size_t count);
513 static void oop_copy (oop* src, oop* dest, size_t count);
514 static void oop_copy_uninit(oop* src, oop* dest, size_t count);
515
516 static void arrayof_jbyte_copy (HeapWord* src, HeapWord* dest, size_t count);
517 static void arrayof_jshort_copy (HeapWord* src, HeapWord* dest, size_t count);
518 static void arrayof_jint_copy (HeapWord* src, HeapWord* dest, size_t count);
519 static void arrayof_jlong_copy (HeapWord* src, HeapWord* dest, size_t count);
520 static void arrayof_oop_copy (HeapWord* src, HeapWord* dest, size_t count);
521 static void arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count);
522 };
523
524 #endif // SHARE_RUNTIME_STUBROUTINES_HPP