1 /*
  2  * Copyright (c) 1997, 2022, 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 "prims/vectorSupport.hpp"
 32 #include "runtime/interfaceSupport.inline.hpp"
 33 #include "runtime/timerTrace.hpp"
 34 #include "runtime/sharedRuntime.hpp"
 35 #include "runtime/stubRoutines.hpp"
 36 #include "utilities/align.hpp"
 37 #include "utilities/copy.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 
 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              = NULL;
106 address StubRoutines::_data_cache_writeback_sync         = NULL;
107 
108 address StubRoutines::_checkcast_arraycopy               = NULL;
109 address StubRoutines::_checkcast_arraycopy_uninit        = NULL;
110 address StubRoutines::_unsafe_arraycopy                  = NULL;
111 address StubRoutines::_generic_arraycopy                 = NULL;
112 
113 address StubRoutines::_jbyte_fill;
114 address StubRoutines::_jshort_fill;
115 address StubRoutines::_jint_fill;
116 address StubRoutines::_arrayof_jbyte_fill;
117 address StubRoutines::_arrayof_jshort_fill;
118 address StubRoutines::_arrayof_jint_fill;
119 
120 address StubRoutines::_aescrypt_encryptBlock               = NULL;
121 address StubRoutines::_aescrypt_decryptBlock               = NULL;
122 address StubRoutines::_cipherBlockChaining_encryptAESCrypt = NULL;
123 address StubRoutines::_cipherBlockChaining_decryptAESCrypt = NULL;
124 address StubRoutines::_electronicCodeBook_encryptAESCrypt  = NULL;
125 address StubRoutines::_electronicCodeBook_decryptAESCrypt  = NULL;
126 address StubRoutines::_counterMode_AESCrypt                = NULL;
127 address StubRoutines::_galoisCounterMode_AESCrypt          = NULL;
128 address StubRoutines::_ghash_processBlocks                 = NULL;
129 address StubRoutines::_base64_encodeBlock                  = NULL;
130 address StubRoutines::_base64_decodeBlock                  = NULL;
131 
132 address StubRoutines::_md5_implCompress      = NULL;
133 address StubRoutines::_md5_implCompressMB    = NULL;
134 address StubRoutines::_sha1_implCompress     = NULL;
135 address StubRoutines::_sha1_implCompressMB   = NULL;
136 address StubRoutines::_sha256_implCompress   = NULL;
137 address StubRoutines::_sha256_implCompressMB = NULL;
138 address StubRoutines::_sha512_implCompress   = NULL;
139 address StubRoutines::_sha512_implCompressMB = NULL;
140 address StubRoutines::_sha3_implCompress     = NULL;
141 address StubRoutines::_sha3_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 address StubRoutines::_bigIntegerRightShiftWorker = NULL;
156 address StubRoutines::_bigIntegerLeftShiftWorker = NULL;
157 
158 address StubRoutines::_vectorizedMismatch = NULL;
159 
160 address StubRoutines::_dexp = NULL;
161 address StubRoutines::_dlog = NULL;
162 address StubRoutines::_dlog10 = NULL;
163 address StubRoutines::_dpow = NULL;
164 address StubRoutines::_dsin = NULL;
165 address StubRoutines::_dcos = NULL;
166 address StubRoutines::_dlibm_sin_cos_huge = NULL;
167 address StubRoutines::_dlibm_reduce_pi04l = NULL;
168 address StubRoutines::_dlibm_tan_cot_huge = NULL;
169 address StubRoutines::_dtan = NULL;
170 
171 address StubRoutines::_vector_f_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_SVML_OP] = {{NULL}, {NULL}};
172 address StubRoutines::_vector_d_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_SVML_OP] = {{NULL}, {NULL}};
173 
174 address StubRoutines::_load_nklass = 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     // Add extra space for large CodeEntryAlignment
214     int max_aligned_stubs = 10;
215     int size = code_size1 + CodeEntryAlignment * max_aligned_stubs;
216     _code1 = BufferBlob::create("StubRoutines (1)", size);
217     if (_code1 == NULL) {
218       vm_exit_out_of_memory(code_size1, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (1)");
219     }
220     CodeBuffer buffer(_code1);
221     StubGenerator_generate(&buffer, false);
222     // When new stubs added we need to make sure there is some space left
223     // to catch situation when we should increase size again.
224     assert(code_size1 == 0 || buffer.insts_remaining() > 200, "increase code_size1");
225   }
226 }
227 
228 
229 #ifdef ASSERT
230 typedef void (*arraycopy_fn)(address src, address dst, int count);
231 
232 // simple tests of generated arraycopy functions
233 static void test_arraycopy_func(address func, int alignment) {
234   int v = 0xcc;
235   int v2 = 0x11;
236   jlong lbuffer[8];
237   jlong lbuffer2[8];
238   address fbuffer  = (address) lbuffer;
239   address fbuffer2 = (address) lbuffer2;
240   unsigned int i;
241   for (i = 0; i < sizeof(lbuffer); i++) {
242     fbuffer[i] = v; fbuffer2[i] = v2;
243   }
244   // C++ does not guarantee jlong[] array alignment to 8 bytes.
245   // Use middle of array to check that memory before it is not modified.
246   address buffer  = align_up((address)&lbuffer[4], BytesPerLong);
247   address buffer2 = align_up((address)&lbuffer2[4], BytesPerLong);
248   // do an aligned copy
249   ((arraycopy_fn)func)(buffer, buffer2, 0);
250   for (i = 0; i < sizeof(lbuffer); i++) {
251     assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
252   }
253   // adjust destination alignment
254   ((arraycopy_fn)func)(buffer, buffer2 + alignment, 0);
255   for (i = 0; i < sizeof(lbuffer); i++) {
256     assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
257   }
258   // adjust source alignment
259   ((arraycopy_fn)func)(buffer + alignment, buffer2, 0);
260   for (i = 0; i < sizeof(lbuffer); i++) {
261     assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
262   }
263 }
264 #endif // ASSERT
265 
266 void StubRoutines::initialize2() {
267   if (_code2 == NULL) {
268     ResourceMark rm;
269     TraceTime timer("StubRoutines generation 2", TRACETIME_LOG(Info, startuptime));
270     // Add extra space for large CodeEntryAlignment
271     int max_aligned_stubs = 100;
272     int size = code_size2 + CodeEntryAlignment * max_aligned_stubs;
273     _code2 = BufferBlob::create("StubRoutines (2)", size);
274     if (_code2 == NULL) {
275       vm_exit_out_of_memory(code_size2, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (2)");
276     }
277     CodeBuffer buffer(_code2);
278     StubGenerator_generate(&buffer, true);
279     // When new stubs added we need to make sure there is some space left
280     // to catch situation when we should increase size again.
281     assert(code_size2 == 0 || buffer.insts_remaining() > 200, "increase code_size2");
282   }
283 
284 #ifdef ASSERT
285 
286   MACOS_AARCH64_ONLY(os::current_thread_enable_wx(WXExec));
287 
288 #define TEST_ARRAYCOPY(type)                                                    \
289   test_arraycopy_func(          type##_arraycopy(),          sizeof(type));     \
290   test_arraycopy_func(          type##_disjoint_arraycopy(), sizeof(type));     \
291   test_arraycopy_func(arrayof_##type##_arraycopy(),          sizeof(HeapWord)); \
292   test_arraycopy_func(arrayof_##type##_disjoint_arraycopy(), sizeof(HeapWord))
293 
294   // Make sure all the arraycopy stubs properly handle zero count
295   TEST_ARRAYCOPY(jbyte);
296   TEST_ARRAYCOPY(jshort);
297   TEST_ARRAYCOPY(jint);
298   TEST_ARRAYCOPY(jlong);
299 
300 #undef TEST_ARRAYCOPY
301 
302 #define TEST_FILL(type)                                                                      \
303   if (_##type##_fill != NULL) {                                                              \
304     union {                                                                                  \
305       double d;                                                                              \
306       type body[96];                                                                         \
307     } s;                                                                                     \
308                                                                                              \
309     int v = 32;                                                                              \
310     for (int offset = -2; offset <= 2; offset++) {                                           \
311       for (int i = 0; i < 96; i++) {                                                         \
312         s.body[i] = 1;                                                                       \
313       }                                                                                      \
314       type* start = s.body + 8 + offset;                                                     \
315       for (int aligned = 0; aligned < 2; aligned++) {                                        \
316         if (aligned) {                                                                       \
317           if (((intptr_t)start) % HeapWordSize == 0) {                                       \
318             ((void (*)(type*, int, int))StubRoutines::_arrayof_##type##_fill)(start, v, 80); \
319           } else {                                                                           \
320             continue;                                                                        \
321           }                                                                                  \
322         } else {                                                                             \
323           ((void (*)(type*, int, int))StubRoutines::_##type##_fill)(start, v, 80);           \
324         }                                                                                    \
325         for (int i = 0; i < 96; i++) {                                                       \
326           if (i < (8 + offset) || i >= (88 + offset)) {                                      \
327             assert(s.body[i] == 1, "what?");                                                 \
328           } else {                                                                           \
329             assert(s.body[i] == 32, "what?");                                                \
330           }                                                                                  \
331         }                                                                                    \
332       }                                                                                      \
333     }                                                                                        \
334   }                                                                                          \
335 
336   TEST_FILL(jbyte);
337   TEST_FILL(jshort);
338   TEST_FILL(jint);
339 
340 #undef TEST_FILL
341 
342 #define TEST_COPYRTN(type) \
343   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_##type##s_atomic),  sizeof(type)); \
344   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::arrayof_conjoint_##type##s), (int)MAX2(sizeof(HeapWord), sizeof(type)))
345 
346   // Make sure all the copy runtime routines properly handle zero count
347   TEST_COPYRTN(jbyte);
348   TEST_COPYRTN(jshort);
349   TEST_COPYRTN(jint);
350   TEST_COPYRTN(jlong);
351 
352 #undef TEST_COPYRTN
353 
354   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_words), sizeof(HeapWord));
355   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words), sizeof(HeapWord));
356   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words_atomic), sizeof(HeapWord));
357   // Aligned to BytesPerLong
358   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_conjoint_words), sizeof(jlong));
359   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_disjoint_words), sizeof(jlong));
360 
361   MACOS_AARCH64_ONLY(os::current_thread_enable_wx(WXWrite));
362 
363 #endif
364 }
365 
366 
367 void stubRoutines_init1() { StubRoutines::initialize1(); }
368 void stubRoutines_init2() { StubRoutines::initialize2(); }
369 
370 //
371 // Default versions of arraycopy functions
372 //
373 
374 JRT_LEAF(void, StubRoutines::jbyte_copy(jbyte* src, jbyte* dest, size_t count))
375 #ifndef PRODUCT
376   SharedRuntime::_jbyte_array_copy_ctr++;      // Slow-path byte array copy
377 #endif // !PRODUCT
378   Copy::conjoint_jbytes_atomic(src, dest, count);
379 JRT_END
380 
381 JRT_LEAF(void, StubRoutines::jshort_copy(jshort* src, jshort* dest, size_t count))
382 #ifndef PRODUCT
383   SharedRuntime::_jshort_array_copy_ctr++;     // Slow-path short/char array copy
384 #endif // !PRODUCT
385   Copy::conjoint_jshorts_atomic(src, dest, count);
386 JRT_END
387 
388 JRT_LEAF(void, StubRoutines::jint_copy(jint* src, jint* dest, size_t count))
389 #ifndef PRODUCT
390   SharedRuntime::_jint_array_copy_ctr++;       // Slow-path int/float array copy
391 #endif // !PRODUCT
392   Copy::conjoint_jints_atomic(src, dest, count);
393 JRT_END
394 
395 JRT_LEAF(void, StubRoutines::jlong_copy(jlong* src, jlong* dest, size_t count))
396 #ifndef PRODUCT
397   SharedRuntime::_jlong_array_copy_ctr++;      // Slow-path long/double array copy
398 #endif // !PRODUCT
399   Copy::conjoint_jlongs_atomic(src, dest, count);
400 JRT_END
401 
402 JRT_LEAF(void, StubRoutines::oop_copy(oop* src, oop* dest, size_t count))
403 #ifndef PRODUCT
404   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
405 #endif // !PRODUCT
406   assert(count != 0, "count should be non-zero");
407   ArrayAccess<>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);
408 JRT_END
409 
410 JRT_LEAF(void, StubRoutines::oop_copy_uninit(oop* src, oop* dest, size_t count))
411 #ifndef PRODUCT
412   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
413 #endif // !PRODUCT
414   assert(count != 0, "count should be non-zero");
415   ArrayAccess<IS_DEST_UNINITIALIZED>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);
416 JRT_END
417 
418 JRT_LEAF(void, StubRoutines::arrayof_jbyte_copy(HeapWord* src, HeapWord* dest, size_t count))
419 #ifndef PRODUCT
420   SharedRuntime::_jbyte_array_copy_ctr++;      // Slow-path byte array copy
421 #endif // !PRODUCT
422   Copy::arrayof_conjoint_jbytes(src, dest, count);
423 JRT_END
424 
425 JRT_LEAF(void, StubRoutines::arrayof_jshort_copy(HeapWord* src, HeapWord* dest, size_t count))
426 #ifndef PRODUCT
427   SharedRuntime::_jshort_array_copy_ctr++;     // Slow-path short/char array copy
428 #endif // !PRODUCT
429   Copy::arrayof_conjoint_jshorts(src, dest, count);
430 JRT_END
431 
432 JRT_LEAF(void, StubRoutines::arrayof_jint_copy(HeapWord* src, HeapWord* dest, size_t count))
433 #ifndef PRODUCT
434   SharedRuntime::_jint_array_copy_ctr++;       // Slow-path int/float array copy
435 #endif // !PRODUCT
436   Copy::arrayof_conjoint_jints(src, dest, count);
437 JRT_END
438 
439 JRT_LEAF(void, StubRoutines::arrayof_jlong_copy(HeapWord* src, HeapWord* dest, size_t count))
440 #ifndef PRODUCT
441   SharedRuntime::_jlong_array_copy_ctr++;       // Slow-path int/float array copy
442 #endif // !PRODUCT
443   Copy::arrayof_conjoint_jlongs(src, dest, count);
444 JRT_END
445 
446 JRT_LEAF(void, StubRoutines::arrayof_oop_copy(HeapWord* src, HeapWord* dest, size_t count))
447 #ifndef PRODUCT
448   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
449 #endif // !PRODUCT
450   assert(count != 0, "count should be non-zero");
451   ArrayAccess<ARRAYCOPY_ARRAYOF>::oop_arraycopy_raw(src, dest, count);
452 JRT_END
453 
454 JRT_LEAF(void, StubRoutines::arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count))
455 #ifndef PRODUCT
456   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
457 #endif // !PRODUCT
458   assert(count != 0, "count should be non-zero");
459   ArrayAccess<ARRAYCOPY_ARRAYOF | IS_DEST_UNINITIALIZED>::oop_arraycopy_raw(src, dest, count);
460 JRT_END
461 
462 address StubRoutines::select_fill_function(BasicType t, bool aligned, const char* &name) {
463 #define RETURN_STUB(xxx_fill) { \
464   name = #xxx_fill; \
465   return StubRoutines::xxx_fill(); }
466 
467   switch (t) {
468   case T_BYTE:
469   case T_BOOLEAN:
470     if (!aligned) RETURN_STUB(jbyte_fill);
471     RETURN_STUB(arrayof_jbyte_fill);
472   case T_CHAR:
473   case T_SHORT:
474     if (!aligned) RETURN_STUB(jshort_fill);
475     RETURN_STUB(arrayof_jshort_fill);
476   case T_INT:
477   case T_FLOAT:
478     if (!aligned) RETURN_STUB(jint_fill);
479     RETURN_STUB(arrayof_jint_fill);
480   case T_DOUBLE:
481   case T_LONG:
482   case T_ARRAY:
483   case T_OBJECT:
484   case T_NARROWOOP:
485   case T_NARROWKLASS:
486   case T_ADDRESS:
487   case T_VOID:
488     // Currently unsupported
489     return NULL;
490 
491   default:
492     ShouldNotReachHere();
493     return NULL;
494   }
495 
496 #undef RETURN_STUB
497 }
498 
499 // constants for computing the copy function
500 enum {
501   COPYFUNC_UNALIGNED = 0,
502   COPYFUNC_ALIGNED = 1,                 // src, dest aligned to HeapWordSize
503   COPYFUNC_CONJOINT = 0,
504   COPYFUNC_DISJOINT = 2                 // src != dest, or transfer can descend
505 };
506 
507 // Note:  The condition "disjoint" applies also for overlapping copies
508 // where an descending copy is permitted (i.e., dest_offset <= src_offset).
509 address
510 StubRoutines::select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name, bool dest_uninitialized) {
511   int selector =
512     (aligned  ? COPYFUNC_ALIGNED  : COPYFUNC_UNALIGNED) +
513     (disjoint ? COPYFUNC_DISJOINT : COPYFUNC_CONJOINT);
514 
515 #define RETURN_STUB(xxx_arraycopy) { \
516   name = #xxx_arraycopy; \
517   return StubRoutines::xxx_arraycopy(); }
518 
519 #define RETURN_STUB_PARM(xxx_arraycopy, parm) { \
520   name = parm ? #xxx_arraycopy "_uninit": #xxx_arraycopy; \
521   return StubRoutines::xxx_arraycopy(parm); }
522 
523   switch (t) {
524   case T_BYTE:
525   case T_BOOLEAN:
526     switch (selector) {
527     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jbyte_arraycopy);
528     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jbyte_arraycopy);
529     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jbyte_disjoint_arraycopy);
530     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jbyte_disjoint_arraycopy);
531     }
532   case T_CHAR:
533   case T_SHORT:
534     switch (selector) {
535     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jshort_arraycopy);
536     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jshort_arraycopy);
537     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jshort_disjoint_arraycopy);
538     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jshort_disjoint_arraycopy);
539     }
540   case T_INT:
541   case T_FLOAT:
542     switch (selector) {
543     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jint_arraycopy);
544     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jint_arraycopy);
545     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jint_disjoint_arraycopy);
546     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jint_disjoint_arraycopy);
547     }
548   case T_DOUBLE:
549   case T_LONG:
550     switch (selector) {
551     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jlong_arraycopy);
552     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jlong_arraycopy);
553     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jlong_disjoint_arraycopy);
554     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jlong_disjoint_arraycopy);
555     }
556   case T_ARRAY:
557   case T_OBJECT:
558     switch (selector) {
559     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB_PARM(oop_arraycopy, dest_uninitialized);
560     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB_PARM(arrayof_oop_arraycopy, dest_uninitialized);
561     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB_PARM(oop_disjoint_arraycopy, dest_uninitialized);
562     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB_PARM(arrayof_oop_disjoint_arraycopy, dest_uninitialized);
563     }
564   default:
565     ShouldNotReachHere();
566     return NULL;
567   }
568 
569 #undef RETURN_STUB
570 #undef RETURN_STUB_PARM
571 }
572 
573 UnsafeCopyMemoryMark::UnsafeCopyMemoryMark(StubCodeGenerator* cgen, bool add_entry, bool continue_at_scope_end, address error_exit_pc) {
574   _cgen = cgen;
575   _ucm_entry = NULL;
576   if (add_entry) {
577     address err_exit_pc = NULL;
578     if (!continue_at_scope_end) {
579       err_exit_pc = error_exit_pc != NULL ? error_exit_pc : UnsafeCopyMemory::common_exit_stub_pc();
580     }
581     assert(err_exit_pc != NULL || continue_at_scope_end, "error exit not set");
582     _ucm_entry = UnsafeCopyMemory::add_to_table(_cgen->assembler()->pc(), NULL, err_exit_pc);
583   }
584 }
585 
586 UnsafeCopyMemoryMark::~UnsafeCopyMemoryMark() {
587   if (_ucm_entry != NULL) {
588     _ucm_entry->set_end_pc(_cgen->assembler()->pc());
589     if (_ucm_entry->error_exit_pc() == NULL) {
590       _ucm_entry->set_error_exit_pc(_cgen->assembler()->pc());
591     }
592   }
593 }