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 #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/klass.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "prims/vectorSupport.hpp"
33 #include "runtime/continuation.hpp"
34 #include "runtime/interfaceSupport.inline.hpp"
35 #include "runtime/timerTrace.hpp"
36 #include "runtime/sharedRuntime.hpp"
37 #include "runtime/stubRoutines.hpp"
38 #include "utilities/align.hpp"
39 #include "utilities/copy.hpp"
40 #ifdef COMPILER2
41 #include "opto/runtime.hpp"
42 #endif
43
44 UnsafeMemoryAccess* UnsafeMemoryAccess::_table = nullptr;
45 int UnsafeMemoryAccess::_table_length = 0;
46 int UnsafeMemoryAccess::_table_max_length = 0;
47 address UnsafeMemoryAccess::_common_exit_stub_pc = nullptr;
48
49 // Implementation of StubRoutines - for a description
50 // of how to extend it, see the header file.
51
52 // Class Variables
53
54 BufferBlob* StubRoutines::_initial_stubs_code = nullptr;
55 BufferBlob* StubRoutines::_final_stubs_code = nullptr;
56 BufferBlob* StubRoutines::_compiler_stubs_code = nullptr;
57 BufferBlob* StubRoutines::_continuation_stubs_code = nullptr;
58
59 address StubRoutines::_call_stub_return_address = nullptr;
60 address StubRoutines::_call_stub_entry = nullptr;
61
62 address StubRoutines::_catch_exception_entry = nullptr;
63 address StubRoutines::_forward_exception_entry = nullptr;
64 address StubRoutines::_throw_AbstractMethodError_entry = nullptr;
65 address StubRoutines::_throw_IncompatibleClassChangeError_entry = nullptr;
66 address StubRoutines::_throw_NullPointerException_at_call_entry = nullptr;
67 address StubRoutines::_throw_StackOverflowError_entry = nullptr;
68 address StubRoutines::_throw_delayed_StackOverflowError_entry = nullptr;
69 jint StubRoutines::_verify_oop_count = 0;
70 address StubRoutines::_verify_oop_subroutine_entry = nullptr;
71 address StubRoutines::_atomic_xchg_entry = nullptr;
72 address StubRoutines::_atomic_cmpxchg_entry = nullptr;
73 address StubRoutines::_atomic_cmpxchg_long_entry = nullptr;
74 address StubRoutines::_atomic_add_entry = nullptr;
75 address StubRoutines::_fence_entry = nullptr;
76
77 // Compiled code entry points default values
78 // The default functions don't have separate disjoint versions.
79 address StubRoutines::_jbyte_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);
80 address StubRoutines::_jshort_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);
81 address StubRoutines::_jint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
82 address StubRoutines::_jlong_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);
83 address StubRoutines::_oop_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);
84 address StubRoutines::_oop_arraycopy_uninit = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);
85 address StubRoutines::_jbyte_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);
86 address StubRoutines::_jshort_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);
87 address StubRoutines::_jint_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
88 address StubRoutines::_jlong_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);
89 address StubRoutines::_oop_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);
90 address StubRoutines::_oop_disjoint_arraycopy_uninit = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);
91
92 address StubRoutines::_arrayof_jbyte_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);
93 address StubRoutines::_arrayof_jshort_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);
94 address StubRoutines::_arrayof_jint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);
95 address StubRoutines::_arrayof_jlong_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);
96 address StubRoutines::_arrayof_oop_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);
97 address StubRoutines::_arrayof_oop_arraycopy_uninit = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);
98 address StubRoutines::_arrayof_jbyte_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);
99 address StubRoutines::_arrayof_jshort_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);
100 address StubRoutines::_arrayof_jint_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);
101 address StubRoutines::_arrayof_jlong_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);
102 address StubRoutines::_arrayof_oop_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);
103 address StubRoutines::_arrayof_oop_disjoint_arraycopy_uninit = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);
104
105 address StubRoutines::_data_cache_writeback = nullptr;
106 address StubRoutines::_data_cache_writeback_sync = nullptr;
107
108 address StubRoutines::_checkcast_arraycopy = nullptr;
109 address StubRoutines::_checkcast_arraycopy_uninit = nullptr;
110 address StubRoutines::_unsafe_arraycopy = nullptr;
111 address StubRoutines::_generic_arraycopy = nullptr;
112
113 address StubRoutines::_unsafe_setmemory = nullptr;
114
115 address StubRoutines::_jbyte_fill;
116 address StubRoutines::_jshort_fill;
117 address StubRoutines::_jint_fill;
118 address StubRoutines::_arrayof_jbyte_fill;
119 address StubRoutines::_arrayof_jshort_fill;
120 address StubRoutines::_arrayof_jint_fill;
121
122 address StubRoutines::_aescrypt_encryptBlock = nullptr;
123 address StubRoutines::_aescrypt_decryptBlock = nullptr;
124 address StubRoutines::_cipherBlockChaining_encryptAESCrypt = nullptr;
125 address StubRoutines::_cipherBlockChaining_decryptAESCrypt = nullptr;
126 address StubRoutines::_electronicCodeBook_encryptAESCrypt = nullptr;
127 address StubRoutines::_electronicCodeBook_decryptAESCrypt = nullptr;
128 address StubRoutines::_counterMode_AESCrypt = nullptr;
129 address StubRoutines::_galoisCounterMode_AESCrypt = nullptr;
130 address StubRoutines::_ghash_processBlocks = nullptr;
131 address StubRoutines::_chacha20Block = nullptr;
132 address StubRoutines::_base64_encodeBlock = nullptr;
133 address StubRoutines::_base64_decodeBlock = nullptr;
134 address StubRoutines::_poly1305_processBlocks = nullptr;
135 address StubRoutines::_intpoly_montgomeryMult_P256 = nullptr;
136 address StubRoutines::_intpoly_assign = nullptr;
137
138 address StubRoutines::_md5_implCompress = nullptr;
139 address StubRoutines::_md5_implCompressMB = nullptr;
140 address StubRoutines::_sha1_implCompress = nullptr;
141 address StubRoutines::_sha1_implCompressMB = nullptr;
142 address StubRoutines::_sha256_implCompress = nullptr;
143 address StubRoutines::_sha256_implCompressMB = nullptr;
144 address StubRoutines::_sha512_implCompress = nullptr;
145 address StubRoutines::_sha512_implCompressMB = nullptr;
146 address StubRoutines::_sha3_implCompress = nullptr;
147 address StubRoutines::_sha3_implCompressMB = nullptr;
148
149 address StubRoutines::_updateBytesCRC32 = nullptr;
150 address StubRoutines::_crc_table_adr = nullptr;
151
152 address StubRoutines::_crc32c_table_addr = nullptr;
153 address StubRoutines::_updateBytesCRC32C = nullptr;
154 address StubRoutines::_updateBytesAdler32 = nullptr;
155
156 address StubRoutines::_multiplyToLen = nullptr;
157 address StubRoutines::_squareToLen = nullptr;
158 address StubRoutines::_mulAdd = nullptr;
159 address StubRoutines::_montgomeryMultiply = nullptr;
160 address StubRoutines::_montgomerySquare = nullptr;
161 address StubRoutines::_bigIntegerRightShiftWorker = nullptr;
162 address StubRoutines::_bigIntegerLeftShiftWorker = nullptr;
163
164 address StubRoutines::_vectorizedMismatch = nullptr;
165
166 address StubRoutines::_dexp = nullptr;
167 address StubRoutines::_dlog = nullptr;
168 address StubRoutines::_dlog10 = nullptr;
169 address StubRoutines::_fmod = nullptr;
170 address StubRoutines::_dpow = nullptr;
171 address StubRoutines::_dsin = nullptr;
172 address StubRoutines::_dcos = nullptr;
173 address StubRoutines::_dlibm_sin_cos_huge = nullptr;
174 address StubRoutines::_dlibm_reduce_pi04l = nullptr;
175 address StubRoutines::_dlibm_tan_cot_huge = nullptr;
176 address StubRoutines::_dtan = nullptr;
177
178 address StubRoutines::_f2hf = nullptr;
179 address StubRoutines::_hf2f = nullptr;
180
181 address StubRoutines::_vector_f_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_SVML_OP] = {{nullptr}, {nullptr}};
182 address StubRoutines::_vector_d_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_SVML_OP] = {{nullptr}, {nullptr}};
183
184 address StubRoutines::_method_entry_barrier = nullptr;
185 address StubRoutines::_array_sort = nullptr;
186 address StubRoutines::_array_partition = nullptr;
187
188 address StubRoutines::_cont_thaw = nullptr;
189 address StubRoutines::_cont_returnBarrier = nullptr;
190 address StubRoutines::_cont_returnBarrierExc = nullptr;
191
192 JFR_ONLY(RuntimeStub* StubRoutines::_jfr_write_checkpoint_stub = nullptr;)
193 JFR_ONLY(address StubRoutines::_jfr_write_checkpoint = nullptr;)
194 JFR_ONLY(RuntimeStub* StubRoutines::_jfr_return_lease_stub = nullptr;)
195 JFR_ONLY(address StubRoutines::_jfr_return_lease = nullptr;)
196
197 address StubRoutines::_upcall_stub_exception_handler = nullptr;
198
199 address StubRoutines::_lookup_secondary_supers_table_slow_path_stub = nullptr;
200 address StubRoutines::_lookup_secondary_supers_table_stubs[Klass::SECONDARY_SUPERS_TABLE_SIZE] = { nullptr };
201
202
203 // Initialization
204 //
205 // Note: to break cycle with universe initialization, stubs are generated in two phases.
206 // The first one generates stubs needed during universe init (e.g., _handle_must_compile_first_entry).
207 // The second phase includes all other stubs (which may depend on universe being initialized.)
208
209 extern void StubGenerator_generate(CodeBuffer* code, StubCodeGenerator::StubsKind kind); // only interface to generators
210
211 void UnsafeMemoryAccess::create_table(int max_size) {
212 UnsafeMemoryAccess::_table = new UnsafeMemoryAccess[max_size];
213 UnsafeMemoryAccess::_table_max_length = max_size;
214 }
215
216 bool UnsafeMemoryAccess::contains_pc(address pc) {
217 for (int i = 0; i < UnsafeMemoryAccess::_table_length; i++) {
218 UnsafeMemoryAccess* entry = &UnsafeMemoryAccess::_table[i];
219 if (pc >= entry->start_pc() && pc < entry->end_pc()) {
220 return true;
221 }
222 }
223 return false;
224 }
225
226 address UnsafeMemoryAccess::page_error_continue_pc(address pc) {
227 for (int i = 0; i < UnsafeMemoryAccess::_table_length; i++) {
228 UnsafeMemoryAccess* entry = &UnsafeMemoryAccess::_table[i];
229 if (pc >= entry->start_pc() && pc < entry->end_pc()) {
230 return entry->error_exit_pc();
231 }
232 }
233 return nullptr;
234 }
235
236
237 static BufferBlob* initialize_stubs(StubCodeGenerator::StubsKind kind,
238 int code_size, int max_aligned_stubs,
239 const char* timer_msg,
240 const char* buffer_name,
241 const char* assert_msg) {
242 ResourceMark rm;
243 TraceTime timer(timer_msg, TRACETIME_LOG(Info, startuptime));
244 // Add extra space for large CodeEntryAlignment
245 int size = code_size + CodeEntryAlignment * max_aligned_stubs;
246 BufferBlob* stubs_code = BufferBlob::create(buffer_name, size);
247 if (stubs_code == nullptr) {
248 vm_exit_out_of_memory(code_size, OOM_MALLOC_ERROR, "CodeCache: no room for %s", buffer_name);
249 }
250 CodeBuffer buffer(stubs_code);
251 StubGenerator_generate(&buffer, kind);
252 // When new stubs added we need to make sure there is some space left
253 // to catch situation when we should increase size again.
254 assert(code_size == 0 || buffer.insts_remaining() > 200, "increase %s", assert_msg);
255
256 LogTarget(Info, stubs) lt;
257 if (lt.is_enabled()) {
258 LogStream ls(lt);
259 ls.print_cr("%s\t [" INTPTR_FORMAT ", " INTPTR_FORMAT "] used: %d, free: %d",
260 buffer_name, p2i(stubs_code->content_begin()), p2i(stubs_code->content_end()),
261 buffer.total_content_size(), buffer.insts_remaining());
262 }
263 return stubs_code;
264 }
265
266 void StubRoutines::initialize_initial_stubs() {
267 if (_initial_stubs_code == nullptr) {
268 _initial_stubs_code = initialize_stubs(StubCodeGenerator::Initial_stubs,
269 _initial_stubs_code_size, 10,
270 "StubRoutines generation initial stubs",
271 "StubRoutines (initial stubs)",
272 "_initial_stubs_code_size");
273 }
274 }
275
276 void StubRoutines::initialize_continuation_stubs() {
277 if (_continuation_stubs_code == nullptr) {
278 _continuation_stubs_code = initialize_stubs(StubCodeGenerator::Continuation_stubs,
279 _continuation_stubs_code_size, 10,
280 "StubRoutines generation continuation stubs",
281 "StubRoutines (continuation stubs)",
282 "_continuation_stubs_code_size");
283 }
284 }
285
286 void StubRoutines::initialize_compiler_stubs() {
287 if (_compiler_stubs_code == nullptr) {
288 _compiler_stubs_code = initialize_stubs(StubCodeGenerator::Compiler_stubs,
289 _compiler_stubs_code_size, 100,
290 "StubRoutines generation compiler stubs",
291 "StubRoutines (compiler stubs)",
292 "_compiler_stubs_code_size");
293 }
294 }
295
296 void StubRoutines::initialize_final_stubs() {
297 if (_final_stubs_code == nullptr) {
298 _final_stubs_code = initialize_stubs(StubCodeGenerator::Final_stubs,
299 _final_stubs_code_size, 10,
300 "StubRoutines generation final stubs",
301 "StubRoutines (final stubs)",
302 "_final_stubs_code_size");
303 }
304 }
305
306 void initial_stubs_init() { StubRoutines::initialize_initial_stubs(); }
307 void continuation_stubs_init() { StubRoutines::initialize_continuation_stubs(); }
308 void final_stubs_init() { StubRoutines::initialize_final_stubs(); }
309
310 void compiler_stubs_init(bool in_compiler_thread) {
311 if (in_compiler_thread && DelayCompilerStubsGeneration) {
312 // Temporarily revert state of stubs generation because
313 // it is called after final_stubs_init() finished
314 // during compiler runtime initialization.
315 // It is fine because these stubs are only used by
316 // compiled code and compiler is not running yet.
317 StubCodeDesc::unfreeze();
318 StubRoutines::initialize_compiler_stubs();
319 StubCodeDesc::freeze();
320 } else if (!in_compiler_thread && !DelayCompilerStubsGeneration) {
321 StubRoutines::initialize_compiler_stubs();
322 }
323 }
324
325 //
326 // Default versions of arraycopy functions
327 //
328
329 JRT_LEAF(void, StubRoutines::jbyte_copy(jbyte* src, jbyte* dest, size_t count))
330 #ifndef PRODUCT
331 SharedRuntime::_jbyte_array_copy_ctr++; // Slow-path byte array copy
332 #endif // !PRODUCT
333 Copy::conjoint_jbytes_atomic(src, dest, count);
334 JRT_END
335
336 JRT_LEAF(void, StubRoutines::jshort_copy(jshort* src, jshort* dest, size_t count))
337 #ifndef PRODUCT
338 SharedRuntime::_jshort_array_copy_ctr++; // Slow-path short/char array copy
339 #endif // !PRODUCT
340 Copy::conjoint_jshorts_atomic(src, dest, count);
341 JRT_END
342
343 JRT_LEAF(void, StubRoutines::jint_copy(jint* src, jint* dest, size_t count))
344 #ifndef PRODUCT
345 SharedRuntime::_jint_array_copy_ctr++; // Slow-path int/float array copy
346 #endif // !PRODUCT
347 Copy::conjoint_jints_atomic(src, dest, count);
348 JRT_END
349
350 JRT_LEAF(void, StubRoutines::jlong_copy(jlong* src, jlong* dest, size_t count))
351 #ifndef PRODUCT
352 SharedRuntime::_jlong_array_copy_ctr++; // Slow-path long/double array copy
353 #endif // !PRODUCT
354 Copy::conjoint_jlongs_atomic(src, dest, count);
355 JRT_END
356
357 JRT_LEAF(void, StubRoutines::oop_copy(oop* src, oop* dest, size_t count))
358 #ifndef PRODUCT
359 SharedRuntime::_oop_array_copy_ctr++; // Slow-path oop array copy
360 #endif // !PRODUCT
361 assert(count != 0, "count should be non-zero");
362 ArrayAccess<>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);
363 JRT_END
364
365 JRT_LEAF(void, StubRoutines::oop_copy_uninit(oop* src, oop* dest, size_t count))
366 #ifndef PRODUCT
367 SharedRuntime::_oop_array_copy_ctr++; // Slow-path oop array copy
368 #endif // !PRODUCT
369 assert(count != 0, "count should be non-zero");
370 ArrayAccess<IS_DEST_UNINITIALIZED>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);
371 JRT_END
372
373 JRT_LEAF(void, StubRoutines::arrayof_jbyte_copy(HeapWord* src, HeapWord* dest, size_t count))
374 #ifndef PRODUCT
375 SharedRuntime::_jbyte_array_copy_ctr++; // Slow-path byte array copy
376 #endif // !PRODUCT
377 Copy::arrayof_conjoint_jbytes(src, dest, count);
378 JRT_END
379
380 JRT_LEAF(void, StubRoutines::arrayof_jshort_copy(HeapWord* src, HeapWord* dest, size_t count))
381 #ifndef PRODUCT
382 SharedRuntime::_jshort_array_copy_ctr++; // Slow-path short/char array copy
383 #endif // !PRODUCT
384 Copy::arrayof_conjoint_jshorts(src, dest, count);
385 JRT_END
386
387 JRT_LEAF(void, StubRoutines::arrayof_jint_copy(HeapWord* src, HeapWord* dest, size_t count))
388 #ifndef PRODUCT
389 SharedRuntime::_jint_array_copy_ctr++; // Slow-path int/float array copy
390 #endif // !PRODUCT
391 Copy::arrayof_conjoint_jints(src, dest, count);
392 JRT_END
393
394 JRT_LEAF(void, StubRoutines::arrayof_jlong_copy(HeapWord* src, HeapWord* dest, size_t count))
395 #ifndef PRODUCT
396 SharedRuntime::_jlong_array_copy_ctr++; // Slow-path int/float array copy
397 #endif // !PRODUCT
398 Copy::arrayof_conjoint_jlongs(src, dest, count);
399 JRT_END
400
401 JRT_LEAF(void, StubRoutines::arrayof_oop_copy(HeapWord* src, HeapWord* dest, size_t count))
402 #ifndef PRODUCT
403 SharedRuntime::_oop_array_copy_ctr++; // Slow-path oop array copy
404 #endif // !PRODUCT
405 assert(count != 0, "count should be non-zero");
406 ArrayAccess<ARRAYCOPY_ARRAYOF>::oop_arraycopy_raw(src, dest, count);
407 JRT_END
408
409 JRT_LEAF(void, StubRoutines::arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count))
410 #ifndef PRODUCT
411 SharedRuntime::_oop_array_copy_ctr++; // Slow-path oop array copy
412 #endif // !PRODUCT
413 assert(count != 0, "count should be non-zero");
414 ArrayAccess<ARRAYCOPY_ARRAYOF | IS_DEST_UNINITIALIZED>::oop_arraycopy_raw(src, dest, count);
415 JRT_END
416
417 address StubRoutines::select_fill_function(BasicType t, bool aligned, const char* &name) {
418 #define RETURN_STUB(xxx_fill) { \
419 name = #xxx_fill; \
420 return StubRoutines::xxx_fill(); }
421
422 switch (t) {
423 case T_BYTE:
424 case T_BOOLEAN:
425 if (!aligned) RETURN_STUB(jbyte_fill);
426 RETURN_STUB(arrayof_jbyte_fill);
427 case T_CHAR:
428 case T_SHORT:
429 if (!aligned) RETURN_STUB(jshort_fill);
430 RETURN_STUB(arrayof_jshort_fill);
431 case T_INT:
432 case T_FLOAT:
433 if (!aligned) RETURN_STUB(jint_fill);
434 RETURN_STUB(arrayof_jint_fill);
435 case T_DOUBLE:
436 case T_LONG:
437 case T_ARRAY:
438 case T_OBJECT:
439 case T_NARROWOOP:
440 case T_NARROWKLASS:
441 case T_ADDRESS:
442 case T_VOID:
443 // Currently unsupported
444 return nullptr;
445
446 default:
447 ShouldNotReachHere();
448 return nullptr;
449 }
450
451 #undef RETURN_STUB
452 }
453
454 // constants for computing the copy function
455 enum {
456 COPYFUNC_UNALIGNED = 0,
457 COPYFUNC_ALIGNED = 1, // src, dest aligned to HeapWordSize
458 COPYFUNC_CONJOINT = 0,
459 COPYFUNC_DISJOINT = 2 // src != dest, or transfer can descend
460 };
461
462 // Note: The condition "disjoint" applies also for overlapping copies
463 // where an descending copy is permitted (i.e., dest_offset <= src_offset).
464 address
465 StubRoutines::select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name, bool dest_uninitialized) {
466 int selector =
467 (aligned ? COPYFUNC_ALIGNED : COPYFUNC_UNALIGNED) +
468 (disjoint ? COPYFUNC_DISJOINT : COPYFUNC_CONJOINT);
469
470 #define RETURN_STUB(xxx_arraycopy) { \
471 name = #xxx_arraycopy; \
472 return StubRoutines::xxx_arraycopy(); }
473
474 #define RETURN_STUB_PARM(xxx_arraycopy, parm) { \
475 name = parm ? #xxx_arraycopy "_uninit": #xxx_arraycopy; \
476 return StubRoutines::xxx_arraycopy(parm); }
477
478 switch (t) {
479 case T_BYTE:
480 case T_BOOLEAN:
481 switch (selector) {
482 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jbyte_arraycopy);
483 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jbyte_arraycopy);
484 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jbyte_disjoint_arraycopy);
485 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jbyte_disjoint_arraycopy);
486 }
487 case T_CHAR:
488 case T_SHORT:
489 switch (selector) {
490 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jshort_arraycopy);
491 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jshort_arraycopy);
492 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jshort_disjoint_arraycopy);
493 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jshort_disjoint_arraycopy);
494 }
495 case T_INT:
496 case T_FLOAT:
497 switch (selector) {
498 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jint_arraycopy);
499 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jint_arraycopy);
500 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jint_disjoint_arraycopy);
501 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jint_disjoint_arraycopy);
502 }
503 case T_DOUBLE:
504 case T_LONG:
505 switch (selector) {
506 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jlong_arraycopy);
507 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jlong_arraycopy);
508 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jlong_disjoint_arraycopy);
509 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jlong_disjoint_arraycopy);
510 }
511 case T_ARRAY:
512 case T_OBJECT:
513 switch (selector) {
514 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB_PARM(oop_arraycopy, dest_uninitialized);
515 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB_PARM(arrayof_oop_arraycopy, dest_uninitialized);
516 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB_PARM(oop_disjoint_arraycopy, dest_uninitialized);
517 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB_PARM(arrayof_oop_disjoint_arraycopy, dest_uninitialized);
518 }
519 default:
520 ShouldNotReachHere();
521 return nullptr;
522 }
523
524 #undef RETURN_STUB
525 #undef RETURN_STUB_PARM
526 }
527
528 UnsafeMemoryAccessMark::UnsafeMemoryAccessMark(StubCodeGenerator* cgen, bool add_entry, bool continue_at_scope_end, address error_exit_pc) {
529 _cgen = cgen;
530 _ucm_entry = nullptr;
531 if (add_entry) {
532 address err_exit_pc = nullptr;
533 if (!continue_at_scope_end) {
534 err_exit_pc = error_exit_pc != nullptr ? error_exit_pc : UnsafeMemoryAccess::common_exit_stub_pc();
535 }
536 assert(err_exit_pc != nullptr || continue_at_scope_end, "error exit not set");
537 _ucm_entry = UnsafeMemoryAccess::add_to_table(_cgen->assembler()->pc(), nullptr, err_exit_pc);
538 }
539 }
540
541 UnsafeMemoryAccessMark::~UnsafeMemoryAccessMark() {
542 if (_ucm_entry != nullptr) {
543 _ucm_entry->set_end_pc(_cgen->assembler()->pc());
544 if (_ucm_entry->error_exit_pc() == nullptr) {
545 _ucm_entry->set_error_exit_pc(_cgen->assembler()->pc());
546 }
547 }
548 }