1 /*
2 * Copyright (c) 1997, 2014, 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 "memory/resourceArea.hpp"
28 #include "oops/oop.inline.hpp"
29 #include "runtime/interfaceSupport.hpp"
30 #include "runtime/sharedRuntime.hpp"
31 #include "runtime/stubRoutines.hpp"
32 #include "runtime/timer.hpp"
33 #include "utilities/copy.hpp"
34 #ifdef COMPILER2
35 #include "opto/runtime.hpp"
36 #endif
37
38
39 // Implementation of StubRoutines - for a description
40 // of how to extend it, see the header file.
41
42 // Class Variables
43
44 BufferBlob* StubRoutines::_code1 = NULL;
45 BufferBlob* StubRoutines::_code2 = NULL;
46
47 address StubRoutines::_call_stub_return_address = NULL;
48 address StubRoutines::_call_stub_entry = NULL;
49
50 address StubRoutines::_catch_exception_entry = NULL;
51 address StubRoutines::_forward_exception_entry = NULL;
52 address StubRoutines::_throw_AbstractMethodError_entry = NULL;
53 address StubRoutines::_throw_IncompatibleClassChangeError_entry = NULL;
54 address StubRoutines::_throw_NullPointerException_at_call_entry = NULL;
55 address StubRoutines::_throw_StackOverflowError_entry = NULL;
56 address StubRoutines::_handler_for_unsafe_access_entry = NULL;
57 jint StubRoutines::_verify_oop_count = 0;
58 address StubRoutines::_verify_oop_subroutine_entry = NULL;
59 address StubRoutines::_atomic_xchg_entry = NULL;
60 address StubRoutines::_atomic_xchg_ptr_entry = NULL;
61 address StubRoutines::_atomic_store_entry = NULL;
62 address StubRoutines::_atomic_store_ptr_entry = NULL;
63 address StubRoutines::_atomic_cmpxchg_entry = NULL;
64 address StubRoutines::_atomic_cmpxchg_ptr_entry = NULL;
65 address StubRoutines::_atomic_cmpxchg_byte_entry = NULL;
66 address StubRoutines::_atomic_cmpxchg_long_entry = NULL;
67 address StubRoutines::_atomic_add_entry = NULL;
68 address StubRoutines::_atomic_add_ptr_entry = NULL;
69 address StubRoutines::_fence_entry = NULL;
70 address StubRoutines::_d2i_wrapper = NULL;
71 address StubRoutines::_d2l_wrapper = NULL;
72
73 jint StubRoutines::_fpu_cntrl_wrd_std = 0;
74 jint StubRoutines::_fpu_cntrl_wrd_24 = 0;
75 jint StubRoutines::_fpu_cntrl_wrd_64 = 0;
76 jint StubRoutines::_fpu_cntrl_wrd_trunc = 0;
77 jint StubRoutines::_mxcsr_std = 0;
78 jint StubRoutines::_fpu_subnormal_bias1[3] = { 0, 0, 0 };
79 jint StubRoutines::_fpu_subnormal_bias2[3] = { 0, 0, 0 };
80
81 // Compiled code entry points default values
82 // The default functions don't have separate disjoint versions.
83 address StubRoutines::_jbyte_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);
84 address StubRoutines::_jshort_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);
85 address StubRoutines::_jint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
86 address StubRoutines::_jlong_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);
87 address StubRoutines::_oop_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);
88 address StubRoutines::_oop_arraycopy_uninit = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);
89 address StubRoutines::_jbyte_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);
90 address StubRoutines::_jshort_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);
91 address StubRoutines::_jint_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);
92 address StubRoutines::_jlong_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);
93 address StubRoutines::_oop_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);
94 address StubRoutines::_oop_disjoint_arraycopy_uninit = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);
95
96 address StubRoutines::_arrayof_jbyte_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);
97 address StubRoutines::_arrayof_jshort_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);
98 address StubRoutines::_arrayof_jint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);
99 address StubRoutines::_arrayof_jlong_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);
100 address StubRoutines::_arrayof_oop_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);
101 address StubRoutines::_arrayof_oop_arraycopy_uninit = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);
102 address StubRoutines::_arrayof_jbyte_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);
103 address StubRoutines::_arrayof_jshort_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);
104 address StubRoutines::_arrayof_jint_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);
105 address StubRoutines::_arrayof_jlong_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);
106 address StubRoutines::_arrayof_oop_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);
107 address StubRoutines::_arrayof_oop_disjoint_arraycopy_uninit = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);
108
109 address StubRoutines::_zero_aligned_words = CAST_FROM_FN_PTR(address, Copy::zero_to_words);
110
111 address StubRoutines::_checkcast_arraycopy = NULL;
112 address StubRoutines::_checkcast_arraycopy_uninit = NULL;
113 address StubRoutines::_unsafe_arraycopy = NULL;
114 address StubRoutines::_generic_arraycopy = NULL;
115
116
117 address StubRoutines::_jbyte_fill;
118 address StubRoutines::_jshort_fill;
119 address StubRoutines::_jint_fill;
120 address StubRoutines::_arrayof_jbyte_fill;
121 address StubRoutines::_arrayof_jshort_fill;
122 address StubRoutines::_arrayof_jint_fill;
123
124 address StubRoutines::_aescrypt_encryptBlock = NULL;
125 address StubRoutines::_aescrypt_decryptBlock = NULL;
126 address StubRoutines::_cipherBlockChaining_encryptAESCrypt = NULL;
127 address StubRoutines::_cipherBlockChaining_decryptAESCrypt = NULL;
128
129 address StubRoutines::_sha1_implCompress = NULL;
130 address StubRoutines::_sha1_implCompressMB = NULL;
131 address StubRoutines::_sha256_implCompress = NULL;
132 address StubRoutines::_sha256_implCompressMB = NULL;
133 address StubRoutines::_sha512_implCompress = NULL;
134 address StubRoutines::_sha512_implCompressMB = NULL;
135
136 address StubRoutines::_updateBytesCRC32 = NULL;
137 address StubRoutines::_crc_table_adr = NULL;
138
139 address StubRoutines::_multiplyToLen = NULL;
140
141 double (* StubRoutines::_intrinsic_log )(double) = NULL;
142 double (* StubRoutines::_intrinsic_log10 )(double) = NULL;
143 double (* StubRoutines::_intrinsic_exp )(double) = NULL;
144 double (* StubRoutines::_intrinsic_pow )(double, double) = NULL;
145 double (* StubRoutines::_intrinsic_sin )(double) = NULL;
146 double (* StubRoutines::_intrinsic_cos )(double) = NULL;
147 double (* StubRoutines::_intrinsic_tan )(double) = NULL;
148
149 address StubRoutines::_safefetch32_entry = NULL;
150 address StubRoutines::_safefetch32_fault_pc = NULL;
151 address StubRoutines::_safefetch32_continuation_pc = NULL;
152 address StubRoutines::_safefetchN_entry = NULL;
153 address StubRoutines::_safefetchN_fault_pc = NULL;
154 address StubRoutines::_safefetchN_continuation_pc = NULL;
155
156 // Initialization
157 //
158 // Note: to break cycle with universe initialization, stubs are generated in two phases.
159 // The first one generates stubs needed during universe init (e.g., _handle_must_compile_first_entry).
160 // The second phase includes all other stubs (which may depend on universe being initialized.)
161
162 extern void StubGenerator_generate(CodeBuffer* code, bool all); // only interface to generators
163
164 void StubRoutines::initialize1() {
165 if (_code1 == NULL) {
166 ResourceMark rm;
167 TraceTime timer("StubRoutines generation 1", TraceStartupTime);
168 _code1 = BufferBlob::create("StubRoutines (1)", code_size1);
169 if (_code1 == NULL) {
170 vm_exit_out_of_memory(code_size1, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (1)");
171 }
172 CodeBuffer buffer(_code1);
173 StubGenerator_generate(&buffer, false);
174 }
175 }
176
177
178 #ifdef ASSERT
179 typedef void (*arraycopy_fn)(address src, address dst, int count);
180
181 // simple tests of generated arraycopy functions
182 static void test_arraycopy_func(address func, int alignment) {
183 int v = 0xcc;
184 int v2 = 0x11;
185 jlong lbuffer[8];
186 jlong lbuffer2[8];
187 address fbuffer = (address) lbuffer;
188 address fbuffer2 = (address) lbuffer2;
189 unsigned int i;
190 for (i = 0; i < sizeof(lbuffer); i++) {
191 fbuffer[i] = v; fbuffer2[i] = v2;
192 }
193 // C++ does not guarantee jlong[] array alignment to 8 bytes.
194 // Use middle of array to check that memory before it is not modified.
195 address buffer = (address) round_to((intptr_t)&lbuffer[4], BytesPerLong);
196 address buffer2 = (address) round_to((intptr_t)&lbuffer2[4], BytesPerLong);
197 // do an aligned copy
198 ((arraycopy_fn)func)(buffer, buffer2, 0);
199 for (i = 0; i < sizeof(lbuffer); i++) {
200 assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
201 }
202 // adjust destination alignment
203 ((arraycopy_fn)func)(buffer, buffer2 + alignment, 0);
204 for (i = 0; i < sizeof(lbuffer); i++) {
205 assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
206 }
207 // adjust source alignment
208 ((arraycopy_fn)func)(buffer + alignment, buffer2, 0);
209 for (i = 0; i < sizeof(lbuffer); i++) {
210 assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");
211 }
212 }
213 #endif
214
215
216 void StubRoutines::initialize2() {
217 if (_code2 == NULL) {
218 ResourceMark rm;
219 TraceTime timer("StubRoutines generation 2", TraceStartupTime);
220 _code2 = BufferBlob::create("StubRoutines (2)", code_size2);
221 if (_code2 == NULL) {
222 vm_exit_out_of_memory(code_size2, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (2)");
223 }
224 CodeBuffer buffer(_code2);
225 StubGenerator_generate(&buffer, true);
226 }
227
228 #ifdef ASSERT
229
230 #define TEST_ARRAYCOPY(type) \
231 test_arraycopy_func( type##_arraycopy(), sizeof(type)); \
232 test_arraycopy_func( type##_disjoint_arraycopy(), sizeof(type)); \
233 test_arraycopy_func(arrayof_##type##_arraycopy(), sizeof(HeapWord)); \
234 test_arraycopy_func(arrayof_##type##_disjoint_arraycopy(), sizeof(HeapWord))
235
236 // Make sure all the arraycopy stubs properly handle zero count
237 TEST_ARRAYCOPY(jbyte);
238 TEST_ARRAYCOPY(jshort);
239 TEST_ARRAYCOPY(jint);
240 TEST_ARRAYCOPY(jlong);
241
242 #undef TEST_ARRAYCOPY
243
244 #define TEST_FILL(type) \
245 if (_##type##_fill != NULL) { \
246 union { \
247 double d; \
248 type body[96]; \
249 } s; \
250 \
251 int v = 32; \
252 for (int offset = -2; offset <= 2; offset++) { \
253 for (int i = 0; i < 96; i++) { \
254 s.body[i] = 1; \
255 } \
256 type* start = s.body + 8 + offset; \
257 for (int aligned = 0; aligned < 2; aligned++) { \
258 if (aligned) { \
259 if (((intptr_t)start) % HeapWordSize == 0) { \
260 ((void (*)(type*, int, int))StubRoutines::_arrayof_##type##_fill)(start, v, 80); \
261 } else { \
262 continue; \
263 } \
264 } else { \
265 ((void (*)(type*, int, int))StubRoutines::_##type##_fill)(start, v, 80); \
266 } \
267 for (int i = 0; i < 96; i++) { \
268 if (i < (8 + offset) || i >= (88 + offset)) { \
269 assert(s.body[i] == 1, "what?"); \
270 } else { \
271 assert(s.body[i] == 32, "what?"); \
272 } \
273 } \
274 } \
275 } \
276 } \
277
278 TEST_FILL(jbyte);
279 TEST_FILL(jshort);
280 TEST_FILL(jint);
281
282 #undef TEST_FILL
283
284 #define TEST_COPYRTN(type) \
285 test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_##type##s_atomic), sizeof(type)); \
286 test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::arrayof_conjoint_##type##s), (int)MAX2(sizeof(HeapWord), sizeof(type)))
287
288 // Make sure all the copy runtime routines properly handle zero count
289 TEST_COPYRTN(jbyte);
290 TEST_COPYRTN(jshort);
291 TEST_COPYRTN(jint);
292 TEST_COPYRTN(jlong);
293
294 #undef TEST_COPYRTN
295
296 test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_words), sizeof(HeapWord));
297 test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words), sizeof(HeapWord));
298 test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words_atomic), sizeof(HeapWord));
299 // Aligned to BytesPerLong
300 test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_conjoint_words), sizeof(jlong));
301 test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_disjoint_words), sizeof(jlong));
302
303 #endif
304 }
305
306
307 void stubRoutines_init1() { StubRoutines::initialize1(); }
308 void stubRoutines_init2() { StubRoutines::initialize2(); }
309
310 //
311 // Default versions of arraycopy functions
312 //
313
314 static void gen_arraycopy_barrier_pre(oop* dest, size_t count, bool dest_uninitialized) {
315 assert(count != 0, "count should be non-zero");
316 assert(count <= (size_t)max_intx, "count too large");
317 BarrierSet* bs = Universe::heap()->barrier_set();
318 assert(bs->has_write_ref_array_pre_opt(), "Must have pre-barrier opt");
319 bs->write_ref_array_pre(dest, (int)count, dest_uninitialized);
320 }
321
322 static void gen_arraycopy_barrier(oop* dest, size_t count) {
323 assert(count != 0, "count should be non-zero");
324 BarrierSet* bs = Universe::heap()->barrier_set();
325 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");
326 bs->write_ref_array((HeapWord*)dest, count);
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 gen_arraycopy_barrier_pre(dest, count, /*dest_uninitialized*/false);
363 Copy::conjoint_oops_atomic(src, dest, count);
364 gen_arraycopy_barrier(dest, count);
365 JRT_END
366
367 JRT_LEAF(void, StubRoutines::oop_copy_uninit(oop* src, oop* dest, size_t count))
368 #ifndef PRODUCT
369 SharedRuntime::_oop_array_copy_ctr++; // Slow-path oop array copy
370 #endif // !PRODUCT
371 assert(count != 0, "count should be non-zero");
372 gen_arraycopy_barrier_pre(dest, count, /*dest_uninitialized*/true);
373 Copy::conjoint_oops_atomic(src, dest, count);
374 gen_arraycopy_barrier(dest, count);
375 JRT_END
376
377 JRT_LEAF(void, StubRoutines::arrayof_jbyte_copy(HeapWord* src, HeapWord* dest, size_t count))
378 #ifndef PRODUCT
379 SharedRuntime::_jbyte_array_copy_ctr++; // Slow-path byte array copy
380 #endif // !PRODUCT
381 Copy::arrayof_conjoint_jbytes(src, dest, count);
382 JRT_END
383
384 JRT_LEAF(void, StubRoutines::arrayof_jshort_copy(HeapWord* src, HeapWord* dest, size_t count))
385 #ifndef PRODUCT
386 SharedRuntime::_jshort_array_copy_ctr++; // Slow-path short/char array copy
387 #endif // !PRODUCT
388 Copy::arrayof_conjoint_jshorts(src, dest, count);
389 JRT_END
390
391 JRT_LEAF(void, StubRoutines::arrayof_jint_copy(HeapWord* src, HeapWord* dest, size_t count))
392 #ifndef PRODUCT
393 SharedRuntime::_jint_array_copy_ctr++; // Slow-path int/float array copy
394 #endif // !PRODUCT
395 Copy::arrayof_conjoint_jints(src, dest, count);
396 JRT_END
397
398 JRT_LEAF(void, StubRoutines::arrayof_jlong_copy(HeapWord* src, HeapWord* dest, size_t count))
399 #ifndef PRODUCT
400 SharedRuntime::_jlong_array_copy_ctr++; // Slow-path int/float array copy
401 #endif // !PRODUCT
402 Copy::arrayof_conjoint_jlongs(src, dest, count);
403 JRT_END
404
405 JRT_LEAF(void, StubRoutines::arrayof_oop_copy(HeapWord* src, HeapWord* dest, size_t count))
406 #ifndef PRODUCT
407 SharedRuntime::_oop_array_copy_ctr++; // Slow-path oop array copy
408 #endif // !PRODUCT
409 assert(count != 0, "count should be non-zero");
410 gen_arraycopy_barrier_pre((oop *) dest, count, /*dest_uninitialized*/false);
411 Copy::arrayof_conjoint_oops(src, dest, count);
412 gen_arraycopy_barrier((oop *) dest, count);
413 JRT_END
414
415 JRT_LEAF(void, StubRoutines::arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count))
416 #ifndef PRODUCT
417 SharedRuntime::_oop_array_copy_ctr++; // Slow-path oop array copy
418 #endif // !PRODUCT
419 assert(count != 0, "count should be non-zero");
420 gen_arraycopy_barrier_pre((oop *) dest, count, /*dest_uninitialized*/true);
421 Copy::arrayof_conjoint_oops(src, dest, count);
422 gen_arraycopy_barrier((oop *) dest, count);
423 JRT_END
424
425 address StubRoutines::select_fill_function(BasicType t, bool aligned, const char* &name) {
426 #define RETURN_STUB(xxx_fill) { \
427 name = #xxx_fill; \
428 return StubRoutines::xxx_fill(); }
429
430 switch (t) {
431 case T_BYTE:
432 case T_BOOLEAN:
433 if (!aligned) RETURN_STUB(jbyte_fill);
434 RETURN_STUB(arrayof_jbyte_fill);
435 case T_CHAR:
436 case T_SHORT:
437 if (!aligned) RETURN_STUB(jshort_fill);
438 RETURN_STUB(arrayof_jshort_fill);
439 case T_INT:
440 case T_FLOAT:
441 if (!aligned) RETURN_STUB(jint_fill);
442 RETURN_STUB(arrayof_jint_fill);
443 case T_DOUBLE:
444 case T_LONG:
445 case T_ARRAY:
446 case T_OBJECT:
447 case T_NARROWOOP:
448 case T_NARROWKLASS:
449 case T_ADDRESS:
450 // Currently unsupported
451 return NULL;
452
453 default:
454 ShouldNotReachHere();
455 return NULL;
456 }
457
458 #undef RETURN_STUB
459 }
460
461 // constants for computing the copy function
462 enum {
463 COPYFUNC_UNALIGNED = 0,
464 COPYFUNC_ALIGNED = 1, // src, dest aligned to HeapWordSize
465 COPYFUNC_CONJOINT = 0,
466 COPYFUNC_DISJOINT = 2 // src != dest, or transfer can descend
467 };
468
469 // Note: The condition "disjoint" applies also for overlapping copies
470 // where an descending copy is permitted (i.e., dest_offset <= src_offset).
471 address
472 StubRoutines::select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name, bool dest_uninitialized) {
473 int selector =
474 (aligned ? COPYFUNC_ALIGNED : COPYFUNC_UNALIGNED) +
475 (disjoint ? COPYFUNC_DISJOINT : COPYFUNC_CONJOINT);
476
477 #define RETURN_STUB(xxx_arraycopy) { \
478 name = #xxx_arraycopy; \
479 return StubRoutines::xxx_arraycopy(); }
480
481 #define RETURN_STUB_PARM(xxx_arraycopy, parm) { \
482 name = #xxx_arraycopy; \
483 return StubRoutines::xxx_arraycopy(parm); }
484
485 switch (t) {
486 case T_BYTE:
487 case T_BOOLEAN:
488 switch (selector) {
489 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jbyte_arraycopy);
490 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jbyte_arraycopy);
491 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jbyte_disjoint_arraycopy);
492 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jbyte_disjoint_arraycopy);
493 }
494 case T_CHAR:
495 case T_SHORT:
496 switch (selector) {
497 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jshort_arraycopy);
498 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jshort_arraycopy);
499 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jshort_disjoint_arraycopy);
500 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jshort_disjoint_arraycopy);
501 }
502 case T_INT:
503 case T_FLOAT:
504 switch (selector) {
505 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jint_arraycopy);
506 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jint_arraycopy);
507 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jint_disjoint_arraycopy);
508 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jint_disjoint_arraycopy);
509 }
510 case T_DOUBLE:
511 case T_LONG:
512 switch (selector) {
513 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jlong_arraycopy);
514 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jlong_arraycopy);
515 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jlong_disjoint_arraycopy);
516 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jlong_disjoint_arraycopy);
517 }
518 case T_ARRAY:
519 case T_OBJECT:
520 switch (selector) {
521 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB_PARM(oop_arraycopy, dest_uninitialized);
522 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB_PARM(arrayof_oop_arraycopy, dest_uninitialized);
523 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB_PARM(oop_disjoint_arraycopy, dest_uninitialized);
524 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB_PARM(arrayof_oop_disjoint_arraycopy, dest_uninitialized);
525 }
526 default:
527 ShouldNotReachHere();
528 return NULL;
529 }
530
531 #undef RETURN_STUB
532 #undef RETURN_STUB_PARM
533 }