1 /*
  2  * Copyright (c) 1997, 2021, 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/continuation.hpp"
 33 #include "runtime/interfaceSupport.inline.hpp"
 34 #include "runtime/timerTrace.hpp"
 35 #include "runtime/safefetch.inline.hpp"
 36 #include "runtime/sharedRuntime.hpp"
 37 #include "utilities/align.hpp"
 38 #include "utilities/copy.hpp"
 39 #ifdef COMPILER2
 40 #include "opto/runtime.hpp"
 41 #endif
 42 
 43 UnsafeCopyMemory* UnsafeCopyMemory::_table                      = NULL;
 44 int UnsafeCopyMemory::_table_length                             = 0;
 45 int UnsafeCopyMemory::_table_max_length                         = 0;
 46 address UnsafeCopyMemory::_common_exit_stub_pc                  = NULL;
 47 
 48 // Implementation of StubRoutines - for a description
 49 // of how to extend it, see the header file.
 50 
 51 // Class Variables
 52 
 53 BufferBlob* StubRoutines::_code1                                = NULL;
 54 BufferBlob* StubRoutines::_code2                                = NULL;
 55 BufferBlob* StubRoutines::_code3                                = NULL;
 56 
 57 address StubRoutines::_call_stub_return_address                 = NULL;
 58 address StubRoutines::_call_stub_entry                          = NULL;
 59 
 60 address StubRoutines::_catch_exception_entry                    = NULL;
 61 address StubRoutines::_forward_exception_entry                  = NULL;
 62 address StubRoutines::_throw_AbstractMethodError_entry          = NULL;
 63 address StubRoutines::_throw_IncompatibleClassChangeError_entry = NULL;
 64 address StubRoutines::_throw_NullPointerException_at_call_entry = NULL;
 65 address StubRoutines::_throw_StackOverflowError_entry           = NULL;
 66 address StubRoutines::_throw_delayed_StackOverflowError_entry   = NULL;
 67 jint    StubRoutines::_verify_oop_count                         = 0;
 68 address StubRoutines::_verify_oop_subroutine_entry              = NULL;
 69 address StubRoutines::_atomic_xchg_entry                        = NULL;
 70 address StubRoutines::_atomic_xchg_long_entry                   = NULL;
 71 address StubRoutines::_atomic_store_entry                       = NULL;
 72 address StubRoutines::_atomic_cmpxchg_entry                     = NULL;
 73 address StubRoutines::_atomic_cmpxchg_byte_entry                = NULL;
 74 address StubRoutines::_atomic_cmpxchg_long_entry                = NULL;
 75 address StubRoutines::_atomic_add_entry                         = NULL;
 76 address StubRoutines::_atomic_add_long_entry                    = NULL;
 77 address StubRoutines::_fence_entry                              = NULL;
 78 
 79 // Compiled code entry points default values
 80 // The default functions don't have separate disjoint versions.
 81 address StubRoutines::_jbyte_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);
 82 address StubRoutines::_jshort_arraycopy         = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);
 83 address StubRoutines::_jint_arraycopy           = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
 84 address StubRoutines::_jlong_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);
 85 address StubRoutines::_oop_arraycopy            = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);
 86 address StubRoutines::_oop_arraycopy_uninit     = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);
 87 address StubRoutines::_jbyte_disjoint_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);
 88 address StubRoutines::_jshort_disjoint_arraycopy         = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);
 89 address StubRoutines::_jint_disjoint_arraycopy           = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
 90 address StubRoutines::_jlong_disjoint_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);
 91 address StubRoutines::_oop_disjoint_arraycopy            = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);
 92 address StubRoutines::_oop_disjoint_arraycopy_uninit     = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);
 93 
 94 bool    StubRoutines::_has_word_memcpy             = false;
 95 address StubRoutines::_word_memcpy_up              = NULL; // CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
 96 address StubRoutines::_word_memcpy_down            = NULL; // CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
 97 address StubRoutines::_word_memcpy_up_nt           = NULL; // CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
 98 address StubRoutines::_word_memcpy_down_nt         = NULL; // CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
 99 
100 address StubRoutines::_arrayof_jbyte_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);
101 address StubRoutines::_arrayof_jshort_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);
102 address StubRoutines::_arrayof_jint_arraycopy   = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);
103 address StubRoutines::_arrayof_jlong_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);
104 address StubRoutines::_arrayof_oop_arraycopy    = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);
105 address StubRoutines::_arrayof_oop_arraycopy_uninit      = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);
106 address StubRoutines::_arrayof_jbyte_disjoint_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);
107 address StubRoutines::_arrayof_jshort_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);
108 address StubRoutines::_arrayof_jint_disjoint_arraycopy   = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);
109 address StubRoutines::_arrayof_jlong_disjoint_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);
110 address StubRoutines::_arrayof_oop_disjoint_arraycopy    = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);
111 address StubRoutines::_arrayof_oop_disjoint_arraycopy_uninit  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);
112 
113 address StubRoutines::_data_cache_writeback              = NULL;
114 address StubRoutines::_data_cache_writeback_sync         = NULL;
115 
116 address StubRoutines::_checkcast_arraycopy               = NULL;
117 address StubRoutines::_checkcast_arraycopy_uninit        = NULL;
118 address StubRoutines::_unsafe_arraycopy                  = NULL;
119 address StubRoutines::_generic_arraycopy                 = NULL;
120 
121 address StubRoutines::_jbyte_fill;
122 address StubRoutines::_jshort_fill;
123 address StubRoutines::_jint_fill;
124 address StubRoutines::_arrayof_jbyte_fill;
125 address StubRoutines::_arrayof_jshort_fill;
126 address StubRoutines::_arrayof_jint_fill;
127 
128 address StubRoutines::_aescrypt_encryptBlock               = NULL;
129 address StubRoutines::_aescrypt_decryptBlock               = NULL;
130 address StubRoutines::_cipherBlockChaining_encryptAESCrypt = NULL;
131 address StubRoutines::_cipherBlockChaining_decryptAESCrypt = NULL;
132 address StubRoutines::_electronicCodeBook_encryptAESCrypt  = NULL;
133 address StubRoutines::_electronicCodeBook_decryptAESCrypt  = NULL;
134 address StubRoutines::_counterMode_AESCrypt                = NULL;
135 address StubRoutines::_galoisCounterMode_AESCrypt          = NULL;
136 address StubRoutines::_ghash_processBlocks                 = NULL;
137 address StubRoutines::_base64_encodeBlock                  = NULL;
138 address StubRoutines::_base64_decodeBlock                  = NULL;
139 
140 address StubRoutines::_md5_implCompress      = NULL;
141 address StubRoutines::_md5_implCompressMB    = NULL;
142 address StubRoutines::_sha1_implCompress     = NULL;
143 address StubRoutines::_sha1_implCompressMB   = NULL;
144 address StubRoutines::_sha256_implCompress   = NULL;
145 address StubRoutines::_sha256_implCompressMB = NULL;
146 address StubRoutines::_sha512_implCompress   = NULL;
147 address StubRoutines::_sha512_implCompressMB = NULL;
148 address StubRoutines::_sha3_implCompress     = NULL;
149 address StubRoutines::_sha3_implCompressMB   = NULL;
150 
151 address StubRoutines::_updateBytesCRC32 = NULL;
152 address StubRoutines::_crc_table_adr =    NULL;
153 
154 address StubRoutines::_crc32c_table_addr = NULL;
155 address StubRoutines::_updateBytesCRC32C = NULL;
156 address StubRoutines::_updateBytesAdler32 = NULL;
157 
158 address StubRoutines::_multiplyToLen = NULL;
159 address StubRoutines::_squareToLen = NULL;
160 address StubRoutines::_mulAdd = NULL;
161 address StubRoutines::_montgomeryMultiply = NULL;
162 address StubRoutines::_montgomerySquare = NULL;
163 address StubRoutines::_bigIntegerRightShiftWorker = NULL;
164 address StubRoutines::_bigIntegerLeftShiftWorker = NULL;
165 
166 address StubRoutines::_vectorizedMismatch = NULL;
167 
168 address StubRoutines::_dexp = NULL;
169 address StubRoutines::_dlog = NULL;
170 address StubRoutines::_dlog10 = NULL;
171 address StubRoutines::_dpow = NULL;
172 address StubRoutines::_dsin = NULL;
173 address StubRoutines::_dcos = NULL;
174 address StubRoutines::_dlibm_sin_cos_huge = NULL;
175 address StubRoutines::_dlibm_reduce_pi04l = NULL;
176 address StubRoutines::_dlibm_tan_cot_huge = NULL;
177 address StubRoutines::_dtan = NULL;
178 
179 address StubRoutines::_safefetch32_entry                 = NULL;
180 address StubRoutines::_safefetch32_fault_pc              = NULL;
181 address StubRoutines::_safefetch32_continuation_pc       = NULL;
182 address StubRoutines::_safefetchN_entry                  = NULL;
183 address StubRoutines::_safefetchN_fault_pc               = NULL;
184 address StubRoutines::_safefetchN_continuation_pc        = NULL;
185 
186 address StubRoutines::_vector_f_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_SVML_OP] = {{NULL}, {NULL}};
187 address StubRoutines::_vector_d_math[VectorSupport::NUM_VEC_SIZES][VectorSupport::NUM_SVML_OP] = {{NULL}, {NULL}};
188 
189 RuntimeStub* StubRoutines::_cont_doYield_stub = NULL;
190 address StubRoutines::_cont_doYield       = NULL;
191 address StubRoutines::_cont_jump_from_sp  = NULL;
192 address StubRoutines::_cont_thaw          = NULL;
193 address StubRoutines::_cont_returnBarrier = NULL;
194 address StubRoutines::_cont_returnBarrierExc = NULL;
195 address StubRoutines::_cont_interpreter_forced_preempt_return = NULL;
196 
197 JFR_ONLY(address StubRoutines::_jfr_write_checkpoint = NULL;)
198 JFR_ONLY(address StubRoutines::_jfr_get_event_writer = NULL;)
199 
200 // Initialization
201 //
202 // Note: to break cycle with universe initialization, stubs are generated in two phases.
203 // The first one generates stubs needed during universe init (e.g., _handle_must_compile_first_entry).
204 // The second phase includes all other stubs (which may depend on universe being initialized.)
205 
206 extern void StubGenerator_generate(CodeBuffer* code, int phase); // only interface to generators
207 
208 void UnsafeCopyMemory::create_table(int max_size) {
209   UnsafeCopyMemory::_table = new UnsafeCopyMemory[max_size];
210   UnsafeCopyMemory::_table_max_length = max_size;
211 }
212 
213 bool UnsafeCopyMemory::contains_pc(address pc) {
214   for (int i = 0; i < UnsafeCopyMemory::_table_length; i++) {
215     UnsafeCopyMemory* entry = &UnsafeCopyMemory::_table[i];
216     if (pc >= entry->start_pc() && pc < entry->end_pc()) {
217       return true;
218     }
219   }
220   return false;
221 }
222 
223 address UnsafeCopyMemory::page_error_continue_pc(address pc) {
224   for (int i = 0; i < UnsafeCopyMemory::_table_length; i++) {
225     UnsafeCopyMemory* entry = &UnsafeCopyMemory::_table[i];
226     if (pc >= entry->start_pc() && pc < entry->end_pc()) {
227       return entry->error_exit_pc();
228     }
229   }
230   return NULL;
231 }
232 
233 void StubRoutines::initialize1() {
234   if (_code1 == NULL) {
235     ResourceMark rm;
236     TraceTime timer("StubRoutines generation 1", TRACETIME_LOG(Info, startuptime));
237     _code1 = BufferBlob::create("StubRoutines (1)", code_size1);
238     if (_code1 == NULL) {
239       vm_exit_out_of_memory(code_size1, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (1)");
240     }
241     CodeBuffer buffer(_code1);
242     StubGenerator_generate(&buffer, 0);
243     // When new stubs added we need to make sure there is some space left
244     // to catch situation when we should increase size again.
245     assert(code_size1 == 0 || buffer.insts_remaining() > 200, "increase code_size1");
246   }
247 }
248 
249 #ifdef ASSERT
250 typedef void (*arraycopy_fn)(address src, address dst, int count);
251 
252 // simple tests of generated arraycopy functions
253 static void test_arraycopy_func(address func, int alignment) {
254   int v = 0xcc;
255   int v2 = 0x11;
256   jlong lbuffer[8];
257   jlong lbuffer2[8];
258   address fbuffer  = (address) lbuffer;
259   address fbuffer2 = (address) lbuffer2;
260   unsigned int i;
261   for (i = 0; i < sizeof(lbuffer); i++) {
262     fbuffer[i] = v; fbuffer2[i] = v2;
263   }
264   // C++ does not guarantee jlong[] array alignment to 8 bytes.
265   // Use middle of array to check that memory before it is not modified.
266   address buffer  = align_up((address)&lbuffer[4], BytesPerLong);
267   address buffer2 = align_up((address)&lbuffer2[4], BytesPerLong);
268   // do an aligned copy
269   ((arraycopy_fn)func)(buffer, buffer2, 0);
270   for (i = 0; i < sizeof(lbuffer); i++) {
271     assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
272   }
273   // adjust destination alignment
274   ((arraycopy_fn)func)(buffer, buffer2 + alignment, 0);
275   for (i = 0; i < sizeof(lbuffer); i++) {
276     assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
277   }
278   // adjust source alignment
279   ((arraycopy_fn)func)(buffer + alignment, buffer2, 0);
280   for (i = 0; i < sizeof(lbuffer); i++) {
281     assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
282   }
283 }
284 #endif // ASSERT
285 
286 void StubRoutines::initializeContinuationStubs() {
287   if (_code3 == NULL) {
288     ResourceMark rm;
289     TraceTime timer("StubRoutines generation 3", TRACETIME_LOG(Info, startuptime));
290     _code3 = BufferBlob::create("StubRoutines (3)", code_size2);
291     if (_code3 == NULL) {
292       vm_exit_out_of_memory(code_size2, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (3)");
293     }
294     CodeBuffer buffer(_code3);
295     StubGenerator_generate(&buffer, 1);
296     // When new stubs added we need to make sure there is some space left
297     // to catch situation when we should increase size again.
298     assert(code_size2 == 0 || buffer.insts_remaining() > 200, "increase code_size3");
299   }
300 }
301 
302 void StubRoutines::initialize2() {
303   if (_code2 == NULL) {
304     ResourceMark rm;
305     TraceTime timer("StubRoutines generation 2", TRACETIME_LOG(Info, startuptime));
306     _code2 = BufferBlob::create("StubRoutines (2)", code_size2);
307     if (_code2 == NULL) {
308       vm_exit_out_of_memory(code_size2, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (2)");
309     }
310     CodeBuffer buffer(_code2);
311     StubGenerator_generate(&buffer, 2);
312     // When new stubs added we need to make sure there is some space left
313     // to catch situation when we should increase size again.
314     assert(code_size2 == 0 || buffer.insts_remaining() > 200, "increase code_size2");
315   }
316 
317 #ifdef ASSERT
318 
319   MACOS_AARCH64_ONLY(os::current_thread_enable_wx(WXExec));
320 
321 #define TEST_ARRAYCOPY(type)                                                    \
322   test_arraycopy_func(          type##_arraycopy(),          sizeof(type));     \
323   test_arraycopy_func(          type##_disjoint_arraycopy(), sizeof(type));     \
324   test_arraycopy_func(arrayof_##type##_arraycopy(),          sizeof(HeapWord)); \
325   test_arraycopy_func(arrayof_##type##_disjoint_arraycopy(), sizeof(HeapWord))
326 
327   // Make sure all the arraycopy stubs properly handle zero count
328   TEST_ARRAYCOPY(jbyte);
329   TEST_ARRAYCOPY(jshort);
330   TEST_ARRAYCOPY(jint);
331   TEST_ARRAYCOPY(jlong);
332 
333 #undef TEST_ARRAYCOPY
334 
335 #define TEST_FILL(type)                                                                      \
336   if (_##type##_fill != NULL) {                                                              \
337     union {                                                                                  \
338       double d;                                                                              \
339       type body[96];                                                                         \
340     } s;                                                                                     \
341                                                                                              \
342     int v = 32;                                                                              \
343     for (int offset = -2; offset <= 2; offset++) {                                           \
344       for (int i = 0; i < 96; i++) {                                                         \
345         s.body[i] = 1;                                                                       \
346       }                                                                                      \
347       type* start = s.body + 8 + offset;                                                     \
348       for (int aligned = 0; aligned < 2; aligned++) {                                        \
349         if (aligned) {                                                                       \
350           if (((intptr_t)start) % HeapWordSize == 0) {                                       \
351             ((void (*)(type*, int, int))StubRoutines::_arrayof_##type##_fill)(start, v, 80); \
352           } else {                                                                           \
353             continue;                                                                        \
354           }                                                                                  \
355         } else {                                                                             \
356           ((void (*)(type*, int, int))StubRoutines::_##type##_fill)(start, v, 80);           \
357         }                                                                                    \
358         for (int i = 0; i < 96; i++) {                                                       \
359           if (i < (8 + offset) || i >= (88 + offset)) {                                      \
360             assert(s.body[i] == 1, "what?");                                                 \
361           } else {                                                                           \
362             assert(s.body[i] == 32, "what?");                                                \
363           }                                                                                  \
364         }                                                                                    \
365       }                                                                                      \
366     }                                                                                        \
367   }                                                                                          \
368 
369   TEST_FILL(jbyte);
370   TEST_FILL(jshort);
371   TEST_FILL(jint);
372 
373 #undef TEST_FILL
374 
375 #define TEST_COPYRTN(type) \
376   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_##type##s_atomic),  sizeof(type)); \
377   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::arrayof_conjoint_##type##s), (int)MAX2(sizeof(HeapWord), sizeof(type)))
378 
379   // Make sure all the copy runtime routines properly handle zero count
380   TEST_COPYRTN(jbyte);
381   TEST_COPYRTN(jshort);
382   TEST_COPYRTN(jint);
383   TEST_COPYRTN(jlong);
384 
385 #undef TEST_COPYRTN
386 
387   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_words), sizeof(HeapWord));
388   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words), sizeof(HeapWord));
389   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words_atomic), sizeof(HeapWord));
390   // Aligned to BytesPerLong
391   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_conjoint_words), sizeof(jlong));
392   test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_disjoint_words), sizeof(jlong));
393 
394   MACOS_AARCH64_ONLY(os::current_thread_enable_wx(WXWrite));
395 
396 #endif
397 }
398 
399 
400 void stubRoutines_init1() { StubRoutines::initialize1(); }
401 void stubRoutines_init2() { StubRoutines::initialize2(); }
402 void stubRoutines_initContinuationStubs() { StubRoutines::initializeContinuationStubs(); }
403 
404 //
405 // Default versions of arraycopy functions
406 //
407 
408 JRT_LEAF(void, StubRoutines::jbyte_copy(jbyte* src, jbyte* dest, size_t count))
409 #ifndef PRODUCT
410   SharedRuntime::_jbyte_array_copy_ctr++;      // Slow-path byte array copy
411 #endif // !PRODUCT
412   Copy::conjoint_jbytes_atomic(src, dest, count);
413 JRT_END
414 
415 JRT_LEAF(void, StubRoutines::jshort_copy(jshort* src, jshort* dest, size_t count))
416 #ifndef PRODUCT
417   SharedRuntime::_jshort_array_copy_ctr++;     // Slow-path short/char array copy
418 #endif // !PRODUCT
419   Copy::conjoint_jshorts_atomic(src, dest, count);
420 JRT_END
421 
422 JRT_LEAF(void, StubRoutines::jint_copy(jint* src, jint* dest, size_t count))
423 #ifndef PRODUCT
424   SharedRuntime::_jint_array_copy_ctr++;       // Slow-path int/float array copy
425 #endif // !PRODUCT
426   Copy::conjoint_jints_atomic(src, dest, count);
427 JRT_END
428 
429 JRT_LEAF(void, StubRoutines::jlong_copy(jlong* src, jlong* dest, size_t count))
430 #ifndef PRODUCT
431   SharedRuntime::_jlong_array_copy_ctr++;      // Slow-path long/double array copy
432 #endif // !PRODUCT
433   Copy::conjoint_jlongs_atomic(src, dest, count);
434 JRT_END
435 
436 JRT_LEAF(void, StubRoutines::oop_copy(oop* src, oop* dest, size_t count))
437 #ifndef PRODUCT
438   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
439 #endif // !PRODUCT
440   assert(count != 0, "count should be non-zero");
441   ArrayAccess<>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);
442 JRT_END
443 
444 JRT_LEAF(void, StubRoutines::oop_copy_uninit(oop* src, oop* dest, size_t count))
445 #ifndef PRODUCT
446   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
447 #endif // !PRODUCT
448   assert(count != 0, "count should be non-zero");
449   ArrayAccess<IS_DEST_UNINITIALIZED>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);
450 JRT_END
451 
452 JRT_LEAF(void, StubRoutines::arrayof_jbyte_copy(HeapWord* src, HeapWord* dest, size_t count))
453 #ifndef PRODUCT
454   SharedRuntime::_jbyte_array_copy_ctr++;      // Slow-path byte array copy
455 #endif // !PRODUCT
456   Copy::arrayof_conjoint_jbytes(src, dest, count);
457 JRT_END
458 
459 JRT_LEAF(void, StubRoutines::arrayof_jshort_copy(HeapWord* src, HeapWord* dest, size_t count))
460 #ifndef PRODUCT
461   SharedRuntime::_jshort_array_copy_ctr++;     // Slow-path short/char array copy
462 #endif // !PRODUCT
463   Copy::arrayof_conjoint_jshorts(src, dest, count);
464 JRT_END
465 
466 JRT_LEAF(void, StubRoutines::arrayof_jint_copy(HeapWord* src, HeapWord* dest, size_t count))
467 #ifndef PRODUCT
468   SharedRuntime::_jint_array_copy_ctr++;       // Slow-path int/float array copy
469 #endif // !PRODUCT
470   Copy::arrayof_conjoint_jints(src, dest, count);
471 JRT_END
472 
473 JRT_LEAF(void, StubRoutines::arrayof_jlong_copy(HeapWord* src, HeapWord* dest, size_t count))
474 #ifndef PRODUCT
475   SharedRuntime::_jlong_array_copy_ctr++;       // Slow-path int/float array copy
476 #endif // !PRODUCT
477   Copy::arrayof_conjoint_jlongs(src, dest, count);
478 JRT_END
479 
480 JRT_LEAF(void, StubRoutines::arrayof_oop_copy(HeapWord* src, HeapWord* dest, size_t count))
481 #ifndef PRODUCT
482   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
483 #endif // !PRODUCT
484   assert(count != 0, "count should be non-zero");
485   ArrayAccess<ARRAYCOPY_ARRAYOF>::oop_arraycopy_raw(src, dest, count);
486 JRT_END
487 
488 JRT_LEAF(void, StubRoutines::arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count))
489 #ifndef PRODUCT
490   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
491 #endif // !PRODUCT
492   assert(count != 0, "count should be non-zero");
493   ArrayAccess<ARRAYCOPY_ARRAYOF | IS_DEST_UNINITIALIZED>::oop_arraycopy_raw(src, dest, count);
494 JRT_END
495 
496 address StubRoutines::select_fill_function(BasicType t, bool aligned, const char* &name) {
497 #define RETURN_STUB(xxx_fill) { \
498   name = #xxx_fill; \
499   return StubRoutines::xxx_fill(); }
500 
501   switch (t) {
502   case T_BYTE:
503   case T_BOOLEAN:
504     if (!aligned) RETURN_STUB(jbyte_fill);
505     RETURN_STUB(arrayof_jbyte_fill);
506   case T_CHAR:
507   case T_SHORT:
508     if (!aligned) RETURN_STUB(jshort_fill);
509     RETURN_STUB(arrayof_jshort_fill);
510   case T_INT:
511   case T_FLOAT:
512     if (!aligned) RETURN_STUB(jint_fill);
513     RETURN_STUB(arrayof_jint_fill);
514   case T_DOUBLE:
515   case T_LONG:
516   case T_ARRAY:
517   case T_OBJECT:
518   case T_NARROWOOP:
519   case T_NARROWKLASS:
520   case T_ADDRESS:
521   case T_VOID:
522     // Currently unsupported
523     return NULL;
524 
525   default:
526     ShouldNotReachHere();
527     return NULL;
528   }
529 
530 #undef RETURN_STUB
531 }
532 
533 // constants for computing the copy function
534 enum {
535   COPYFUNC_UNALIGNED = 0,
536   COPYFUNC_ALIGNED = 1,                 // src, dest aligned to HeapWordSize
537   COPYFUNC_CONJOINT = 0,
538   COPYFUNC_DISJOINT = 2                 // src != dest, or transfer can descend
539 };
540 
541 // Note:  The condition "disjoint" applies also for overlapping copies
542 // where an descending copy is permitted (i.e., dest_offset <= src_offset).
543 address
544 StubRoutines::select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name, bool dest_uninitialized) {
545   int selector =
546     (aligned  ? COPYFUNC_ALIGNED  : COPYFUNC_UNALIGNED) +
547     (disjoint ? COPYFUNC_DISJOINT : COPYFUNC_CONJOINT);
548 
549 #define RETURN_STUB(xxx_arraycopy) { \
550   name = #xxx_arraycopy; \
551   return StubRoutines::xxx_arraycopy(); }
552 
553 #define RETURN_STUB_PARM(xxx_arraycopy, parm) { \
554   name = parm ? #xxx_arraycopy "_uninit": #xxx_arraycopy; \
555   return StubRoutines::xxx_arraycopy(parm); }
556 
557   switch (t) {
558   case T_BYTE:
559   case T_BOOLEAN:
560     switch (selector) {
561     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jbyte_arraycopy);
562     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jbyte_arraycopy);
563     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jbyte_disjoint_arraycopy);
564     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jbyte_disjoint_arraycopy);
565     }
566   case T_CHAR:
567   case T_SHORT:
568     switch (selector) {
569     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jshort_arraycopy);
570     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jshort_arraycopy);
571     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jshort_disjoint_arraycopy);
572     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jshort_disjoint_arraycopy);
573     }
574   case T_INT:
575   case T_FLOAT:
576     switch (selector) {
577     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jint_arraycopy);
578     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jint_arraycopy);
579     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jint_disjoint_arraycopy);
580     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jint_disjoint_arraycopy);
581     }
582   case T_DOUBLE:
583   case T_LONG:
584     switch (selector) {
585     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jlong_arraycopy);
586     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jlong_arraycopy);
587     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB(jlong_disjoint_arraycopy);
588     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB(arrayof_jlong_disjoint_arraycopy);
589     }
590   case T_ARRAY:
591   case T_OBJECT:
592     switch (selector) {
593     case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB_PARM(oop_arraycopy, dest_uninitialized);
594     case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED:    RETURN_STUB_PARM(arrayof_oop_arraycopy, dest_uninitialized);
595     case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED:  RETURN_STUB_PARM(oop_disjoint_arraycopy, dest_uninitialized);
596     case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED:    RETURN_STUB_PARM(arrayof_oop_disjoint_arraycopy, dest_uninitialized);
597     }
598   default:
599     ShouldNotReachHere();
600     return NULL;
601   }
602 
603 #undef RETURN_STUB
604 #undef RETURN_STUB_PARM
605 }
606 
607 UnsafeCopyMemoryMark::UnsafeCopyMemoryMark(StubCodeGenerator* cgen, bool add_entry, bool continue_at_scope_end, address error_exit_pc) {
608   _cgen = cgen;
609   _ucm_entry = NULL;
610   if (add_entry) {
611     address err_exit_pc = NULL;
612     if (!continue_at_scope_end) {
613       err_exit_pc = error_exit_pc != NULL ? error_exit_pc : UnsafeCopyMemory::common_exit_stub_pc();
614     }
615     assert(err_exit_pc != NULL || continue_at_scope_end, "error exit not set");
616     _ucm_entry = UnsafeCopyMemory::add_to_table(_cgen->assembler()->pc(), NULL, err_exit_pc);
617   }
618 }
619 
620 UnsafeCopyMemoryMark::~UnsafeCopyMemoryMark() {
621   if (_ucm_entry != NULL) {
622     _ucm_entry->set_end_pc(_cgen->assembler()->pc());
623     if (_ucm_entry->error_exit_pc() == NULL) {
624       _ucm_entry->set_error_exit_pc(_cgen->assembler()->pc());
625     }
626   }
627 }