Fri, 29 Apr 2016 00:06:10 +0800
Added MIPS 64-bit port.
1 /*
2 * Copyright (c) 2003, 2011, 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 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_UTILITIES_COPY_HPP
32 #define SHARE_VM_UTILITIES_COPY_HPP
34 #include "runtime/stubRoutines.hpp"
36 // Assembly code for platforms that need it.
37 extern "C" {
38 void _Copy_conjoint_words(HeapWord* from, HeapWord* to, size_t count);
39 void _Copy_disjoint_words(HeapWord* from, HeapWord* to, size_t count);
41 void _Copy_conjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count);
42 void _Copy_disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count);
44 void _Copy_aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count);
45 void _Copy_aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count);
47 void _Copy_conjoint_bytes(void* from, void* to, size_t count);
49 void _Copy_conjoint_bytes_atomic (void* from, void* to, size_t count);
50 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count);
51 void _Copy_conjoint_jints_atomic (jint* from, jint* to, size_t count);
52 void _Copy_conjoint_jlongs_atomic (jlong* from, jlong* to, size_t count);
53 void _Copy_conjoint_oops_atomic (oop* from, oop* to, size_t count);
55 void _Copy_arrayof_conjoint_bytes (HeapWord* from, HeapWord* to, size_t count);
56 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count);
57 void _Copy_arrayof_conjoint_jints (HeapWord* from, HeapWord* to, size_t count);
58 void _Copy_arrayof_conjoint_jlongs (HeapWord* from, HeapWord* to, size_t count);
59 void _Copy_arrayof_conjoint_oops (HeapWord* from, HeapWord* to, size_t count);
60 }
62 class Copy : AllStatic {
63 public:
64 // Block copy methods have four attributes. We don't define all possibilities.
65 // alignment: aligned to BytesPerLong
66 // arrayof: arraycopy operation with both operands aligned on the same
67 // boundary as the first element of an array of the copy unit.
68 // This is currently a HeapWord boundary on all platforms, except
69 // for long and double arrays, which are aligned on an 8-byte
70 // boundary on all platforms.
71 // arraycopy operations are implicitly atomic on each array element.
72 // overlap: disjoint or conjoint.
73 // copy unit: bytes or words (i.e., HeapWords) or oops (i.e., pointers).
74 // atomicity: atomic or non-atomic on the copy unit.
75 //
76 // Names are constructed thusly:
77 //
78 // [ 'aligned_' | 'arrayof_' ]
79 // ('conjoint_' | 'disjoint_')
80 // ('words' | 'bytes' | 'jshorts' | 'jints' | 'jlongs' | 'oops')
81 // [ '_atomic' ]
82 //
83 // Except in the arrayof case, whatever the alignment is, we assume we can copy
84 // whole alignment units. E.g., if BytesPerLong is 2x word alignment, an odd
85 // count may copy an extra word. In the arrayof case, we are allowed to copy
86 // only the number of copy units specified.
87 //
88 // All callees check count for 0.
89 //
91 // HeapWords
93 // Word-aligned words, conjoint, not atomic on each word
94 static void conjoint_words(HeapWord* from, HeapWord* to, size_t count) {
95 assert_params_ok(from, to, LogHeapWordSize);
96 pd_conjoint_words(from, to, count);
97 }
99 // Word-aligned words, disjoint, not atomic on each word
100 static void disjoint_words(HeapWord* from, HeapWord* to, size_t count) {
101 assert_params_ok(from, to, LogHeapWordSize);
102 assert_disjoint(from, to, count);
103 pd_disjoint_words(from, to, count);
104 }
106 // Word-aligned words, disjoint, atomic on each word
107 static void disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count) {
108 assert_params_ok(from, to, LogHeapWordSize);
109 assert_disjoint(from, to, count);
110 pd_disjoint_words_atomic(from, to, count);
111 }
113 // Object-aligned words, conjoint, not atomic on each word
114 static void aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count) {
115 assert_params_aligned(from, to);
116 pd_aligned_conjoint_words(from, to, count);
117 }
119 // Object-aligned words, disjoint, not atomic on each word
120 static void aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count) {
121 assert_params_aligned(from, to);
122 assert_disjoint(from, to, count);
123 pd_aligned_disjoint_words(from, to, count);
124 }
126 // bytes, jshorts, jints, jlongs, oops
128 // bytes, conjoint, not atomic on each byte (not that it matters)
129 static void conjoint_jbytes(void* from, void* to, size_t count) {
130 pd_conjoint_bytes(from, to, count);
131 }
133 // bytes, conjoint, atomic on each byte (not that it matters)
134 static void conjoint_jbytes_atomic(void* from, void* to, size_t count) {
135 pd_conjoint_bytes(from, to, count);
136 }
138 // jshorts, conjoint, atomic on each jshort
139 static void conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
140 assert_params_ok(from, to, LogBytesPerShort);
141 pd_conjoint_jshorts_atomic(from, to, count);
142 }
144 // jints, conjoint, atomic on each jint
145 static void conjoint_jints_atomic(jint* from, jint* to, size_t count) {
146 assert_params_ok(from, to, LogBytesPerInt);
147 pd_conjoint_jints_atomic(from, to, count);
148 }
150 // jlongs, conjoint, atomic on each jlong
151 static void conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
152 assert_params_ok(from, to, LogBytesPerLong);
153 pd_conjoint_jlongs_atomic(from, to, count);
154 }
156 // oops, conjoint, atomic on each oop
157 static void conjoint_oops_atomic(oop* from, oop* to, size_t count) {
158 assert_params_ok(from, to, LogBytesPerHeapOop);
159 pd_conjoint_oops_atomic(from, to, count);
160 }
162 // overloaded for UseCompressedOops
163 static void conjoint_oops_atomic(narrowOop* from, narrowOop* to, size_t count) {
164 assert(sizeof(narrowOop) == sizeof(jint), "this cast is wrong");
165 assert_params_ok(from, to, LogBytesPerInt);
166 pd_conjoint_jints_atomic((jint*)from, (jint*)to, count);
167 }
169 // Copy a span of memory. If the span is an integral number of aligned
170 // longs, words, or ints, copy those units atomically.
171 // The largest atomic transfer unit is 8 bytes, or the largest power
172 // of two which divides all of from, to, and size, whichever is smaller.
173 static void conjoint_memory_atomic(void* from, void* to, size_t size);
175 // bytes, conjoint array, atomic on each byte (not that it matters)
176 static void arrayof_conjoint_jbytes(HeapWord* from, HeapWord* to, size_t count) {
177 pd_arrayof_conjoint_bytes(from, to, count);
178 }
180 // jshorts, conjoint array, atomic on each jshort
181 static void arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count) {
182 assert_params_ok(from, to, LogBytesPerShort);
183 pd_arrayof_conjoint_jshorts(from, to, count);
184 }
186 // jints, conjoint array, atomic on each jint
187 static void arrayof_conjoint_jints(HeapWord* from, HeapWord* to, size_t count) {
188 assert_params_ok(from, to, LogBytesPerInt);
189 pd_arrayof_conjoint_jints(from, to, count);
190 }
192 // jlongs, conjoint array, atomic on each jlong
193 static void arrayof_conjoint_jlongs(HeapWord* from, HeapWord* to, size_t count) {
194 assert_params_ok(from, to, LogBytesPerLong);
195 pd_arrayof_conjoint_jlongs(from, to, count);
196 }
198 // oops, conjoint array, atomic on each oop
199 static void arrayof_conjoint_oops(HeapWord* from, HeapWord* to, size_t count) {
200 assert_params_ok(from, to, LogBytesPerHeapOop);
201 pd_arrayof_conjoint_oops(from, to, count);
202 }
204 // Known overlap methods
206 // Copy word-aligned words from higher to lower addresses, not atomic on each word
207 inline static void conjoint_words_to_lower(HeapWord* from, HeapWord* to, size_t byte_count) {
208 // byte_count is in bytes to check its alignment
209 assert_params_ok(from, to, LogHeapWordSize);
210 assert_byte_count_ok(byte_count, HeapWordSize);
212 size_t count = (size_t)round_to(byte_count, HeapWordSize) >> LogHeapWordSize;
213 assert(to <= from || from + count <= to, "do not overwrite source data");
215 while (count-- > 0) {
216 *to++ = *from++;
217 }
218 }
220 // Copy word-aligned words from lower to higher addresses, not atomic on each word
221 inline static void conjoint_words_to_higher(HeapWord* from, HeapWord* to, size_t byte_count) {
222 // byte_count is in bytes to check its alignment
223 assert_params_ok(from, to, LogHeapWordSize);
224 assert_byte_count_ok(byte_count, HeapWordSize);
226 size_t count = (size_t)round_to(byte_count, HeapWordSize) >> LogHeapWordSize;
227 assert(from <= to || to + count <= from, "do not overwrite source data");
229 from += count - 1;
230 to += count - 1;
231 while (count-- > 0) {
232 *to-- = *from--;
233 }
234 }
236 // Fill methods
238 // Fill word-aligned words, not atomic on each word
239 // set_words
240 static void fill_to_words(HeapWord* to, size_t count, juint value = 0) {
241 assert_params_ok(to, LogHeapWordSize);
242 pd_fill_to_words(to, count, value);
243 }
245 static void fill_to_aligned_words(HeapWord* to, size_t count, juint value = 0) {
246 assert_params_aligned(to);
247 pd_fill_to_aligned_words(to, count, value);
248 }
250 // Fill bytes
251 static void fill_to_bytes(void* to, size_t count, jubyte value = 0) {
252 pd_fill_to_bytes(to, count, value);
253 }
255 // Fill a span of memory. If the span is an integral number of aligned
256 // longs, words, or ints, store to those units atomically.
257 // The largest atomic transfer unit is 8 bytes, or the largest power
258 // of two which divides both to and size, whichever is smaller.
259 static void fill_to_memory_atomic(void* to, size_t size, jubyte value = 0);
261 // Zero-fill methods
263 // Zero word-aligned words, not atomic on each word
264 static void zero_to_words(HeapWord* to, size_t count) {
265 assert_params_ok(to, LogHeapWordSize);
266 pd_zero_to_words(to, count);
267 }
269 // Zero bytes
270 static void zero_to_bytes(void* to, size_t count) {
271 pd_zero_to_bytes(to, count);
272 }
274 private:
275 static bool params_disjoint(HeapWord* from, HeapWord* to, size_t count) {
276 if (from < to) {
277 return pointer_delta(to, from) >= count;
278 }
279 return pointer_delta(from, to) >= count;
280 }
282 // These methods raise a fatal if they detect a problem.
284 static void assert_disjoint(HeapWord* from, HeapWord* to, size_t count) {
285 #ifdef ASSERT
286 if (!params_disjoint(from, to, count))
287 basic_fatal("source and dest overlap");
288 #endif
289 }
291 static void assert_params_ok(void* from, void* to, intptr_t log_align) {
292 #ifdef ASSERT
293 if (mask_bits((uintptr_t)from, right_n_bits(log_align)) != 0)
294 basic_fatal("not aligned");
295 if (mask_bits((uintptr_t)to, right_n_bits(log_align)) != 0)
296 basic_fatal("not aligned");
297 #endif
298 }
300 static void assert_params_ok(HeapWord* to, intptr_t log_align) {
301 #ifdef ASSERT
302 if (mask_bits((uintptr_t)to, right_n_bits(log_align)) != 0)
303 basic_fatal("not word aligned");
304 #endif
305 }
306 static void assert_params_aligned(HeapWord* from, HeapWord* to) {
307 #ifdef ASSERT
308 if (mask_bits((uintptr_t)from, BytesPerLong-1) != 0)
309 basic_fatal("not long aligned");
310 if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0)
311 basic_fatal("not long aligned");
312 #endif
313 }
315 static void assert_params_aligned(HeapWord* to) {
316 #ifdef ASSERT
317 if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0)
318 basic_fatal("not long aligned");
319 #endif
320 }
322 static void assert_byte_count_ok(size_t byte_count, size_t unit_size) {
323 #ifdef ASSERT
324 if ((size_t)round_to(byte_count, unit_size) != byte_count) {
325 basic_fatal("byte count must be aligned");
326 }
327 #endif
328 }
331 // SAPJVM AS 2011-09-20. Template for atomic copy.
332 template <class T> static void copy_conjoint_atomic(T* from, T* to, size_t count)
333 {
334 if (from > to) {
335 while (count-- > 0) {
336 // Copy forwards
337 *to++ = *from++;
338 }
339 } else {
340 from += count - 1;
341 to += count - 1;
342 while (count-- > 0) {
343 // Copy backwards
344 *to-- = *from--;
345 }
346 }
347 }
351 // Platform dependent implementations of the above methods.
352 #ifdef TARGET_ARCH_x86
353 # include "copy_x86.hpp"
354 #endif
355 #ifdef TARGET_ARCH_sparc
356 # include "copy_sparc.hpp"
357 #endif
358 #ifdef TARGET_ARCH_zero
359 # include "copy_zero.hpp"
360 #endif
361 #ifdef TARGET_ARCH_arm
362 # include "copy_arm.hpp"
363 #endif
364 #ifdef TARGET_ARCH_ppc
365 # include "copy_ppc.hpp"
366 #endif
367 #ifdef TARGET_ARCH_mips
368 # include "copy_mips.hpp"
369 #endif
372 };
374 #endif // SHARE_VM_UTILITIES_COPY_HPP