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.
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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. Most
40 // routines have a single (main) entry point. However, a few routines
41 // do provide alternative entry points.
42 //
43 // Stub routines whose entries are advertised via class StubRoutines
44 // are generated in batches at well-defined stages during JVM init:
45 // initial stubs, continuation stubs, compiler stubs, final stubs.
46 // Each batch is embedded in a single, associated blob (an instance of
47 // BufferBlob) i.e. the blob to entry relationship is 1-m.
48 //
49 // Note that this constrasts with the much smaller number of stub
50 // routines generated via classes SharedRuntime, c1_Runtime1 and
51 // OptoRuntime. The latter routines are also generated at well-defined
52 // points during JVM init. However, each stub routine has its own
53 // unique blob (various subclasses of RuntimeBlob) i.e. the blob to
54 // entry relationship is 1-1. The difference arises because
55 // SharedRuntime routines may need to be relocatable or advertise
56 // properties such as a frame size via their blob.
57 //
58 // Staging of stub routine generation is needed in order to manage
59 // init dependencies between 1) stubs and other stubs or 2) stubs and
60 // other runtime components. For example, some exception throw stubs
61 // need to be generated before compiler stubs (such as the
62 // deoptimization stub) so that the latter can invoke the thrwo rotine
63 // in bail-out code. Likewise, stubs that access objects (such as the
64 // object array copy stub) need to be created after initialization of
65 // some GC constants and generation of the GC barrier stubs they might
66 // need to invoke.
67 //
68 // Class scheme:
69 //
70 // platform-independent platform-dependent
71 //
72 // stubRoutines.hpp <-- included -- stubRoutines_<arch>.hpp
73 // ^ ^
74 // | |
75 // implements implements
76 // | |
77 // | |
78 // stubRoutines.cpp stubRoutines_<arch>.cpp
79 // stubGenerator_<arch>.cpp
80 //
81 // Note 1: The important thing is a clean decoupling between stub
82 // entry points (interfacing to the whole vm; i.e., 1-to-n
83 // relationship) and stub generators (interfacing only to
84 // the entry points implementation; i.e., 1-to-1 relationship).
85 // This significantly simplifies changes in the generator
86 // structure since the rest of the vm is not affected.
87 //
88 // Note 2: stubGenerator_<arch>.cpp contains a minimal portion of
89 // machine-independent code; namely the generator calls of
90 // the generator functions that are used platform-independently.
91 // However, it comes with the advantage of having a 1-file
92 // implementation of the generator. It should be fairly easy
93 // to change, should it become a problem later.
94 //
95 // Scheme for adding a new entry point:
96 //
97 // 1. determine if it's a platform-dependent or independent entry point
98 // a) if platform independent: make subsequent changes in the independent files
99 // b) if platform dependent: make subsequent changes in the dependent files
100 // 2. add a private instance variable holding the entry point address
101 // 3. add a public accessor function to the instance variable
102 // 4. implement the corresponding generator function in the platform-dependent
103 // stubGenerator_<arch>.cpp file and call the function in generate_all() of that file
104 // 5. ensure the entry is generated in the right blob to satisfy initialization
105 // dependencies between it and other stubs or runtime components.
106
107 class UnsafeMemoryAccess : public CHeapObj<mtCode> {
108 private:
109 address _start_pc;
110 address _end_pc;
111 address _error_exit_pc;
112 public:
113 static address _common_exit_stub_pc;
114 static UnsafeMemoryAccess* _table;
115 static int _table_length;
116 static int _table_max_length;
117 UnsafeMemoryAccess() : _start_pc(nullptr), _end_pc(nullptr), _error_exit_pc(nullptr) {}
118 void set_start_pc(address pc) { _start_pc = pc; }
119 void set_end_pc(address pc) { _end_pc = pc; }
120 void set_error_exit_pc(address pc) { _error_exit_pc = pc; }
121 address start_pc() const { return _start_pc; }
122 address end_pc() const { return _end_pc; }
123 address error_exit_pc() const { return _error_exit_pc; }
124
125 static void set_common_exit_stub_pc(address pc) { _common_exit_stub_pc = pc; }
126 static address common_exit_stub_pc() { return _common_exit_stub_pc; }
127
128 static UnsafeMemoryAccess* add_to_table(address start_pc, address end_pc, address error_exit_pc) {
129 guarantee(_table_length < _table_max_length, "Incorrect UnsafeMemoryAccess::_table_max_length");
130 UnsafeMemoryAccess* entry = &_table[_table_length];
131 entry->set_start_pc(start_pc);
132 entry->set_end_pc(end_pc);
133 entry->set_error_exit_pc(error_exit_pc);
134
135 _table_length++;
136 return entry;
137 }
138
139 static bool contains_pc(address pc);
140 static address page_error_continue_pc(address pc);
141 static void create_table(int max_size);
142 };
143
144 class UnsafeMemoryAccessMark : public StackObj {
145 private:
146 UnsafeMemoryAccess* _ucm_entry;
147 StubCodeGenerator* _cgen;
148 public:
149 UnsafeMemoryAccessMark(StubCodeGenerator* cgen, bool add_entry, bool continue_at_scope_end, address error_exit_pc = nullptr);
150 ~UnsafeMemoryAccessMark();
151 };
152
153 class StubRoutines: AllStatic {
154
155 public:
156 // Dependencies
157 friend class StubGenerator;
158
159 #include CPU_HEADER(stubRoutines)
160
161 static jint _verify_oop_count;
162 static address _verify_oop_subroutine_entry;
163
164 static address _call_stub_return_address; // the return PC, when returning to a call stub
165 static address _call_stub_entry;
166 static address _forward_exception_entry;
167 static address _catch_exception_entry;
168
169 static address _atomic_xchg_entry;
170 static address _atomic_cmpxchg_entry;
171 static address _atomic_cmpxchg_long_entry;
172 static address _atomic_add_entry;
173 static address _fence_entry;
174
175 static BufferBlob* _initial_stubs_code; // code buffer for initial routines
176 static BufferBlob* _continuation_stubs_code; // code buffer for continuation stubs
177 static BufferBlob* _compiler_stubs_code; // code buffer for C2 intrinsics
178 static BufferBlob* _final_stubs_code; // code buffer for all other routines
179
180 static address _array_sort;
181 static address _array_partition;
182 // Leaf routines which implement arraycopy and their addresses
183 // arraycopy operands aligned on element type boundary
184 static address _jbyte_arraycopy;
185 static address _jshort_arraycopy;
186 static address _jint_arraycopy;
187 static address _jlong_arraycopy;
188 static address _oop_arraycopy, _oop_arraycopy_uninit;
189 static address _jbyte_disjoint_arraycopy;
190 static address _jshort_disjoint_arraycopy;
191 static address _jint_disjoint_arraycopy;
192 static address _jlong_disjoint_arraycopy;
193 static address _oop_disjoint_arraycopy, _oop_disjoint_arraycopy_uninit;
194
195 // arraycopy operands aligned on zero'th element boundary
196 // These are identical to the ones aligned aligned on an
197 // element type boundary, except that they assume that both
198 // source and destination are HeapWord aligned.
199 static address _arrayof_jbyte_arraycopy;
200 static address _arrayof_jshort_arraycopy;
201 static address _arrayof_jint_arraycopy;
202 static address _arrayof_jlong_arraycopy;
203 static address _arrayof_oop_arraycopy, _arrayof_oop_arraycopy_uninit;
204 static address _arrayof_jbyte_disjoint_arraycopy;
205 static address _arrayof_jshort_disjoint_arraycopy;
206 static address _arrayof_jint_disjoint_arraycopy;
207 static address _arrayof_jlong_disjoint_arraycopy;
208 static address _arrayof_oop_disjoint_arraycopy, _arrayof_oop_disjoint_arraycopy_uninit;
209
210 // cache line writeback
211 static address _data_cache_writeback;
212 static address _data_cache_writeback_sync;
213
214 // these are recommended but optional:
215 static address _checkcast_arraycopy, _checkcast_arraycopy_uninit;
216 static address _unsafe_arraycopy;
217 static address _generic_arraycopy;
218
219 static address _unsafe_setmemory;
220
221 static address _jbyte_fill;
222 static address _jshort_fill;
223 static address _jint_fill;
224 static address _arrayof_jbyte_fill;
225 static address _arrayof_jshort_fill;
226 static address _arrayof_jint_fill;
227
228 static address _aescrypt_encryptBlock;
229 static address _aescrypt_decryptBlock;
230 static address _cipherBlockChaining_encryptAESCrypt;
231 static address _cipherBlockChaining_decryptAESCrypt;
232 static address _electronicCodeBook_encryptAESCrypt;
233 static address _electronicCodeBook_decryptAESCrypt;
234 static address _counterMode_AESCrypt;
235 static address _galoisCounterMode_AESCrypt;
236 static address _ghash_processBlocks;
237 static address _chacha20Block;
238 static address _base64_encodeBlock;
239 static address _base64_decodeBlock;
240 static address _poly1305_processBlocks;
241 static address _intpoly_montgomeryMult_P256;
242 static address _intpoly_assign;
243
244 static address _md5_implCompress;
245 static address _md5_implCompressMB;
246 static address _sha1_implCompress;
247 static address _sha1_implCompressMB;
248 static address _sha256_implCompress;
249 static address _sha256_implCompressMB;
250 static address _sha512_implCompress;
251 static address _sha512_implCompressMB;
252 static address _sha3_implCompress;
253 static address _sha3_implCompressMB;
254
255 static address _updateBytesCRC32;
256 static address _crc_table_adr;
257
258 static address _string_indexof_array[4];
259
260 static address _crc32c_table_addr;
261 static address _updateBytesCRC32C;
262 static address _updateBytesAdler32;
263
264 static address _multiplyToLen;
265 static address _squareToLen;
266 static address _mulAdd;
267 static address _montgomeryMultiply;
268 static address _montgomerySquare;
269 static address _bigIntegerRightShiftWorker;
270 static address _bigIntegerLeftShiftWorker;
271
272 static address _vectorizedMismatch;
273
274 static address _dexp;
275 static address _dlog;
276 static address _dlog10;
277 static address _dpow;
278 static address _dsin;
279 static address _dcos;
280 static address _dlibm_sin_cos_huge;
281 static address _dlibm_reduce_pi04l;
282 static address _dlibm_tan_cot_huge;
283 static address _dtan;
284 static address _dtanh;
285 static address _fmod;
286
287 static address _f2hf;
288 static address _hf2f;
289
290 static address _method_entry_barrier;
291
292 static address _cont_thaw;
293 static address _cont_returnBarrier;
294 static address _cont_returnBarrierExc;
295
296 // Vector Math Routines
297 static address _vector_f_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_VECTOR_OP_MATH];
298 static address _vector_d_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_VECTOR_OP_MATH];
299
300 static address _upcall_stub_exception_handler;
301 static address _upcall_stub_load_target;
302
303 static address _lookup_secondary_supers_table_stubs[];
304 static address _lookup_secondary_supers_table_slow_path_stub;
305
306 public:
307 // Initialization/Testing
308 static void initialize_initial_stubs(); // must happen before universe::genesis
309 static void initialize_continuation_stubs(); // must happen after universe::genesis
310 static void initialize_compiler_stubs(); // must happen after universe::genesis
311 static void initialize_final_stubs(); // must happen after universe::genesis
312
313 static bool is_stub_code(address addr) { return contains(addr); }
314
315 static bool contains(address addr) {
316 return
317 (_initial_stubs_code != nullptr && _initial_stubs_code->blob_contains(addr)) ||
318 (_continuation_stubs_code != nullptr && _continuation_stubs_code->blob_contains(addr)) ||
319 (_compiler_stubs_code != nullptr && _compiler_stubs_code->blob_contains(addr)) ||
320 (_final_stubs_code != nullptr && _final_stubs_code->blob_contains(addr)) ;
321 }
322
323 static RuntimeBlob* initial_stubs_code() { return _initial_stubs_code; }
324 static RuntimeBlob* continuation_stubs_code() { return _continuation_stubs_code; }
325 static RuntimeBlob* compiler_stubs_code() { return _compiler_stubs_code; }
326 static RuntimeBlob* final_stubs_code() { return _final_stubs_code; }
327
328 // Debugging
329 static jint verify_oop_count() { return _verify_oop_count; }
330 static jint* verify_oop_count_addr() { return &_verify_oop_count; }
331 // a subroutine for debugging the GC
332 static address verify_oop_subroutine_entry_address() { return (address)&_verify_oop_subroutine_entry; }
333
334 static address catch_exception_entry() { return _catch_exception_entry; }
335
336 // Calls to Java
337 typedef void (*CallStub)(
338 address link,
339 intptr_t* result,
340 int result_type, /* BasicType on 4 bytes */
341 Method* method,
342 address entry_point,
343 intptr_t* parameters,
344 int size_of_parameters,
345 TRAPS
346 );
347
348 static CallStub call_stub() { return CAST_TO_FN_PTR(CallStub, _call_stub_entry); }
349
350 // Exceptions
351 static address forward_exception_entry() { return _forward_exception_entry; }
352
353 static address atomic_xchg_entry() { return _atomic_xchg_entry; }
354 static address atomic_cmpxchg_entry() { return _atomic_cmpxchg_entry; }
355 static address atomic_cmpxchg_long_entry() { return _atomic_cmpxchg_long_entry; }
356 static address atomic_add_entry() { return _atomic_add_entry; }
357 static address fence_entry() { return _fence_entry; }
358
359 static address select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name, bool dest_uninitialized);
360
361 static address jbyte_arraycopy() { return _jbyte_arraycopy; }
362 static address jshort_arraycopy() { return _jshort_arraycopy; }
363 static address jint_arraycopy() { return _jint_arraycopy; }
364 static address jlong_arraycopy() { return _jlong_arraycopy; }
365 static address oop_arraycopy(bool dest_uninitialized = false) {
366 return dest_uninitialized ? _oop_arraycopy_uninit : _oop_arraycopy;
367 }
368 static address jbyte_disjoint_arraycopy() { return _jbyte_disjoint_arraycopy; }
369 static address jshort_disjoint_arraycopy() { return _jshort_disjoint_arraycopy; }
370 static address jint_disjoint_arraycopy() { return _jint_disjoint_arraycopy; }
371 static address jlong_disjoint_arraycopy() { return _jlong_disjoint_arraycopy; }
372 static address oop_disjoint_arraycopy(bool dest_uninitialized = false) {
373 return dest_uninitialized ? _oop_disjoint_arraycopy_uninit : _oop_disjoint_arraycopy;
374 }
375
376 static address arrayof_jbyte_arraycopy() { return _arrayof_jbyte_arraycopy; }
377 static address arrayof_jshort_arraycopy() { return _arrayof_jshort_arraycopy; }
378 static address arrayof_jint_arraycopy() { return _arrayof_jint_arraycopy; }
379 static address arrayof_jlong_arraycopy() { return _arrayof_jlong_arraycopy; }
380 static address arrayof_oop_arraycopy(bool dest_uninitialized = false) {
381 return dest_uninitialized ? _arrayof_oop_arraycopy_uninit : _arrayof_oop_arraycopy;
382 }
383
384 static address arrayof_jbyte_disjoint_arraycopy() { return _arrayof_jbyte_disjoint_arraycopy; }
385 static address arrayof_jshort_disjoint_arraycopy() { return _arrayof_jshort_disjoint_arraycopy; }
386 static address arrayof_jint_disjoint_arraycopy() { return _arrayof_jint_disjoint_arraycopy; }
387 static address arrayof_jlong_disjoint_arraycopy() { return _arrayof_jlong_disjoint_arraycopy; }
388 static address arrayof_oop_disjoint_arraycopy(bool dest_uninitialized = false) {
389 return dest_uninitialized ? _arrayof_oop_disjoint_arraycopy_uninit : _arrayof_oop_disjoint_arraycopy;
390 }
391 static address data_cache_writeback() { return _data_cache_writeback; }
392 static address data_cache_writeback_sync() { return _data_cache_writeback_sync; }
393
394 typedef void (*DataCacheWritebackStub)(void *);
395 static DataCacheWritebackStub DataCacheWriteback_stub() { return CAST_TO_FN_PTR(DataCacheWritebackStub, _data_cache_writeback); }
396 typedef void (*DataCacheWritebackSyncStub)(bool);
397 static DataCacheWritebackSyncStub DataCacheWritebackSync_stub() { return CAST_TO_FN_PTR(DataCacheWritebackSyncStub, _data_cache_writeback_sync); }
398
399 static address checkcast_arraycopy(bool dest_uninitialized = false) {
400 return dest_uninitialized ? _checkcast_arraycopy_uninit : _checkcast_arraycopy;
401 }
402 static address unsafe_arraycopy() { return _unsafe_arraycopy; }
403
404 typedef void (*UnsafeArrayCopyStub)(const void* src, void* dst, size_t count);
405 static UnsafeArrayCopyStub UnsafeArrayCopy_stub() { return CAST_TO_FN_PTR(UnsafeArrayCopyStub, _unsafe_arraycopy); }
406
407 static address unsafe_setmemory() { return _unsafe_setmemory; }
408
409 typedef void (*UnsafeSetMemoryStub)(void* dst, size_t count, char byte);
410 static UnsafeSetMemoryStub UnsafeSetMemory_stub() { return CAST_TO_FN_PTR(UnsafeSetMemoryStub, _unsafe_setmemory); }
411
412 static address generic_arraycopy() { return _generic_arraycopy; }
413 static address select_arraysort_function() { return _array_sort; }
414 static address select_array_partition_function() { return _array_partition; }
415
416 static address jbyte_fill() { return _jbyte_fill; }
417 static address jshort_fill() { return _jshort_fill; }
418 static address jint_fill() { return _jint_fill; }
419 static address arrayof_jbyte_fill() { return _arrayof_jbyte_fill; }
420 static address arrayof_jshort_fill() { return _arrayof_jshort_fill; }
421 static address arrayof_jint_fill() { return _arrayof_jint_fill; }
422
423 static address aescrypt_encryptBlock() { return _aescrypt_encryptBlock; }
424 static address aescrypt_decryptBlock() { return _aescrypt_decryptBlock; }
425 static address cipherBlockChaining_encryptAESCrypt() { return _cipherBlockChaining_encryptAESCrypt; }
426 static address cipherBlockChaining_decryptAESCrypt() { return _cipherBlockChaining_decryptAESCrypt; }
427 static address electronicCodeBook_encryptAESCrypt() { return _electronicCodeBook_encryptAESCrypt; }
428 static address electronicCodeBook_decryptAESCrypt() { return _electronicCodeBook_decryptAESCrypt; }
429 static address poly1305_processBlocks() { return _poly1305_processBlocks; }
430 static address intpoly_montgomeryMult_P256() { return _intpoly_montgomeryMult_P256; }
431 static address intpoly_assign() { return _intpoly_assign; }
432 static address counterMode_AESCrypt() { return _counterMode_AESCrypt; }
433 static address ghash_processBlocks() { return _ghash_processBlocks; }
434 static address chacha20Block() { return _chacha20Block; }
435 static address base64_encodeBlock() { return _base64_encodeBlock; }
436 static address base64_decodeBlock() { return _base64_decodeBlock; }
437 static address md5_implCompress() { return _md5_implCompress; }
438 static address md5_implCompressMB() { return _md5_implCompressMB; }
439 static address sha1_implCompress() { return _sha1_implCompress; }
440 static address sha1_implCompressMB() { return _sha1_implCompressMB; }
441 static address sha256_implCompress() { return _sha256_implCompress; }
442 static address sha256_implCompressMB() { return _sha256_implCompressMB; }
443 static address sha512_implCompress() { return _sha512_implCompress; }
444 static address sha512_implCompressMB() { return _sha512_implCompressMB; }
445 static address sha3_implCompress() { return _sha3_implCompress; }
446 static address sha3_implCompressMB() { return _sha3_implCompressMB; }
447
448 static address updateBytesCRC32() { return _updateBytesCRC32; }
449 static address crc_table_addr() { return _crc_table_adr; }
450
451 static address crc32c_table_addr() { return _crc32c_table_addr; }
452 static address updateBytesCRC32C() { return _updateBytesCRC32C; }
453 static address updateBytesAdler32() { return _updateBytesAdler32; }
454
455 static address multiplyToLen() { return _multiplyToLen; }
456 static address squareToLen() { return _squareToLen; }
457 static address mulAdd() { return _mulAdd; }
458 static address montgomeryMultiply() { return _montgomeryMultiply; }
459 static address montgomerySquare() { return _montgomerySquare; }
460 static address bigIntegerRightShift() { return _bigIntegerRightShiftWorker; }
461 static address bigIntegerLeftShift() { return _bigIntegerLeftShiftWorker; }
462 static address galoisCounterMode_AESCrypt() { return _galoisCounterMode_AESCrypt; }
463
464 static address vectorizedMismatch() { return _vectorizedMismatch; }
465
466 static address dexp() { return _dexp; }
467 static address dlog() { return _dlog; }
468 static address dlog10() { return _dlog10; }
469 static address dpow() { return _dpow; }
470 static address fmod() { return _fmod; }
471 static address dsin() { return _dsin; }
472 static address dcos() { return _dcos; }
473 static address dlibm_reduce_pi04l() { return _dlibm_reduce_pi04l; }
474 static address dlibm_sin_cos_huge() { return _dlibm_sin_cos_huge; }
475 static address dlibm_tan_cot_huge() { return _dlibm_tan_cot_huge; }
476 static address dtan() { return _dtan; }
477 static address dtanh() { return _dtanh; }
478
479 // These are versions of the java.lang.Float::floatToFloat16() and float16ToFloat()
480 // methods which perform the same operations as the intrinsic version.
481 // They are used for constant folding in JIT compiler to ensure equivalence.
482 //
483 static address f2hf_adr() { return _f2hf; }
484 static address hf2f_adr() { return _hf2f; }
485
486 static jshort f2hf(jfloat x) {
487 assert(_f2hf != nullptr, "stub is not implemented on this platform");
488 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXExec, Thread::current());) // About to call into code cache
489 typedef jshort (*f2hf_stub_t)(jfloat x);
490 return ((f2hf_stub_t)_f2hf)(x);
491 }
492 static jfloat hf2f(jshort x) {
493 assert(_hf2f != nullptr, "stub is not implemented on this platform");
494 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXExec, Thread::current());) // About to call into code cache
495 typedef jfloat (*hf2f_stub_t)(jshort x);
496 return ((hf2f_stub_t)_hf2f)(x);
497 }
498
499 static address method_entry_barrier() { return _method_entry_barrier; }
500
501 static address cont_thaw() { return _cont_thaw; }
502 static address cont_returnBarrier() { return _cont_returnBarrier; }
503 static address cont_returnBarrierExc(){return _cont_returnBarrierExc; }
504
505 static address upcall_stub_exception_handler() {
506 assert(_upcall_stub_exception_handler != nullptr, "not implemented");
507 return _upcall_stub_exception_handler;
508 }
509
510 static address upcall_stub_load_target() {
511 assert(_upcall_stub_load_target != nullptr, "not implemented");
512 return _upcall_stub_load_target;
513 }
514
515 static address lookup_secondary_supers_table_stub(u1 slot) {
516 assert(slot < Klass::SECONDARY_SUPERS_TABLE_SIZE, "out of bounds");
517 assert(_lookup_secondary_supers_table_stubs[slot] != nullptr, "not implemented");
518 return _lookup_secondary_supers_table_stubs[slot];
519 }
520
521 static address lookup_secondary_supers_table_slow_path_stub() {
522 assert(_lookup_secondary_supers_table_slow_path_stub != nullptr, "not implemented");
523 return _lookup_secondary_supers_table_slow_path_stub;
524 }
525
526 static address select_fill_function(BasicType t, bool aligned, const char* &name);
527
528 //
529 // Default versions of the above arraycopy functions for platforms which do
530 // not have specialized versions
531 //
532 static void jbyte_copy (jbyte* src, jbyte* dest, size_t count);
533 static void jshort_copy (jshort* src, jshort* dest, size_t count);
534 static void jint_copy (jint* src, jint* dest, size_t count);
535 static void jlong_copy (jlong* src, jlong* dest, size_t count);
536 static void oop_copy (oop* src, oop* dest, size_t count);
537 static void oop_copy_uninit(oop* src, oop* dest, size_t count);
538
539 static void arrayof_jbyte_copy (HeapWord* src, HeapWord* dest, size_t count);
540 static void arrayof_jshort_copy (HeapWord* src, HeapWord* dest, size_t count);
541 static void arrayof_jint_copy (HeapWord* src, HeapWord* dest, size_t count);
542 static void arrayof_jlong_copy (HeapWord* src, HeapWord* dest, size_t count);
543 static void arrayof_oop_copy (HeapWord* src, HeapWord* dest, size_t count);
544 static void arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count);
545 };
546
547 #endif // SHARE_RUNTIME_STUBROUTINES_HPP