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annotate src/share/vm/utilities/copy.hpp @ 3757:f8c9417e3571
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0 | 1 /* |
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2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_UTILITIES_COPY_HPP |
26 #define SHARE_VM_UTILITIES_COPY_HPP | |
27 | |
28 #include "runtime/stubRoutines.hpp" | |
29 | |
0 | 30 // Assembly code for platforms that need it. |
31 extern "C" { | |
32 void _Copy_conjoint_words(HeapWord* from, HeapWord* to, size_t count); | |
33 void _Copy_disjoint_words(HeapWord* from, HeapWord* to, size_t count); | |
34 | |
35 void _Copy_conjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count); | |
36 void _Copy_disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count); | |
37 | |
38 void _Copy_aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count); | |
39 void _Copy_aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count); | |
40 | |
41 void _Copy_conjoint_bytes(void* from, void* to, size_t count); | |
42 | |
43 void _Copy_conjoint_bytes_atomic (void* from, void* to, size_t count); | |
44 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count); | |
45 void _Copy_conjoint_jints_atomic (jint* from, jint* to, size_t count); | |
46 void _Copy_conjoint_jlongs_atomic (jlong* from, jlong* to, size_t count); | |
47 void _Copy_conjoint_oops_atomic (oop* from, oop* to, size_t count); | |
48 | |
49 void _Copy_arrayof_conjoint_bytes (HeapWord* from, HeapWord* to, size_t count); | |
50 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count); | |
51 void _Copy_arrayof_conjoint_jints (HeapWord* from, HeapWord* to, size_t count); | |
52 void _Copy_arrayof_conjoint_jlongs (HeapWord* from, HeapWord* to, size_t count); | |
53 void _Copy_arrayof_conjoint_oops (HeapWord* from, HeapWord* to, size_t count); | |
54 } | |
55 | |
56 class Copy : AllStatic { | |
57 public: | |
58 // Block copy methods have four attributes. We don't define all possibilities. | |
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59 // alignment: aligned to BytesPerLong |
0 | 60 // arrayof: arraycopy operation with both operands aligned on the same |
61 // boundary as the first element of an array of the copy unit. | |
62 // This is currently a HeapWord boundary on all platforms, except | |
63 // for long and double arrays, which are aligned on an 8-byte | |
64 // boundary on all platforms. | |
65 // arraycopy operations are implicitly atomic on each array element. | |
66 // overlap: disjoint or conjoint. | |
67 // copy unit: bytes or words (i.e., HeapWords) or oops (i.e., pointers). | |
68 // atomicity: atomic or non-atomic on the copy unit. | |
69 // | |
70 // Names are constructed thusly: | |
71 // | |
72 // [ 'aligned_' | 'arrayof_' ] | |
73 // ('conjoint_' | 'disjoint_') | |
74 // ('words' | 'bytes' | 'jshorts' | 'jints' | 'jlongs' | 'oops') | |
75 // [ '_atomic' ] | |
76 // | |
77 // Except in the arrayof case, whatever the alignment is, we assume we can copy | |
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78 // whole alignment units. E.g., if BytesPerLong is 2x word alignment, an odd |
0 | 79 // count may copy an extra word. In the arrayof case, we are allowed to copy |
80 // only the number of copy units specified. | |
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81 // |
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82 // All callees check count for 0. |
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83 // |
0 | 84 |
85 // HeapWords | |
86 | |
87 // Word-aligned words, conjoint, not atomic on each word | |
88 static void conjoint_words(HeapWord* from, HeapWord* to, size_t count) { | |
89 assert_params_ok(from, to, LogHeapWordSize); | |
90 pd_conjoint_words(from, to, count); | |
91 } | |
92 | |
93 // Word-aligned words, disjoint, not atomic on each word | |
94 static void disjoint_words(HeapWord* from, HeapWord* to, size_t count) { | |
95 assert_params_ok(from, to, LogHeapWordSize); | |
96 assert_disjoint(from, to, count); | |
97 pd_disjoint_words(from, to, count); | |
98 } | |
99 | |
100 // Word-aligned words, disjoint, atomic on each word | |
101 static void disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count) { | |
102 assert_params_ok(from, to, LogHeapWordSize); | |
103 assert_disjoint(from, to, count); | |
104 pd_disjoint_words_atomic(from, to, count); | |
105 } | |
106 | |
107 // Object-aligned words, conjoint, not atomic on each word | |
108 static void aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count) { | |
109 assert_params_aligned(from, to); | |
110 pd_aligned_conjoint_words(from, to, count); | |
111 } | |
112 | |
113 // Object-aligned words, disjoint, not atomic on each word | |
114 static void aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count) { | |
115 assert_params_aligned(from, to); | |
116 assert_disjoint(from, to, count); | |
117 pd_aligned_disjoint_words(from, to, count); | |
118 } | |
119 | |
120 // bytes, jshorts, jints, jlongs, oops | |
121 | |
122 // bytes, conjoint, not atomic on each byte (not that it matters) | |
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123 static void conjoint_jbytes(void* from, void* to, size_t count) { |
0 | 124 pd_conjoint_bytes(from, to, count); |
125 } | |
126 | |
127 // bytes, conjoint, atomic on each byte (not that it matters) | |
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128 static void conjoint_jbytes_atomic(void* from, void* to, size_t count) { |
0 | 129 pd_conjoint_bytes(from, to, count); |
130 } | |
131 | |
132 // jshorts, conjoint, atomic on each jshort | |
133 static void conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { | |
134 assert_params_ok(from, to, LogBytesPerShort); | |
135 pd_conjoint_jshorts_atomic(from, to, count); | |
136 } | |
137 | |
138 // jints, conjoint, atomic on each jint | |
139 static void conjoint_jints_atomic(jint* from, jint* to, size_t count) { | |
140 assert_params_ok(from, to, LogBytesPerInt); | |
141 pd_conjoint_jints_atomic(from, to, count); | |
142 } | |
143 | |
144 // jlongs, conjoint, atomic on each jlong | |
145 static void conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { | |
146 assert_params_ok(from, to, LogBytesPerLong); | |
147 pd_conjoint_jlongs_atomic(from, to, count); | |
148 } | |
149 | |
150 // oops, conjoint, atomic on each oop | |
151 static void conjoint_oops_atomic(oop* from, oop* to, size_t count) { | |
113
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152 assert_params_ok(from, to, LogBytesPerHeapOop); |
0 | 153 pd_conjoint_oops_atomic(from, to, count); |
154 } | |
155 | |
113
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156 // overloaded for UseCompressedOops |
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157 static void conjoint_oops_atomic(narrowOop* from, narrowOop* to, size_t count) { |
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158 assert(sizeof(narrowOop) == sizeof(jint), "this cast is wrong"); |
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159 assert_params_ok(from, to, LogBytesPerInt); |
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160 pd_conjoint_jints_atomic((jint*)from, (jint*)to, count); |
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161 } |
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162 |
0 | 163 // Copy a span of memory. If the span is an integral number of aligned |
164 // longs, words, or ints, copy those units atomically. | |
165 // The largest atomic transfer unit is 8 bytes, or the largest power | |
166 // of two which divides all of from, to, and size, whichever is smaller. | |
167 static void conjoint_memory_atomic(void* from, void* to, size_t size); | |
168 | |
169 // bytes, conjoint array, atomic on each byte (not that it matters) | |
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170 static void arrayof_conjoint_jbytes(HeapWord* from, HeapWord* to, size_t count) { |
0 | 171 pd_arrayof_conjoint_bytes(from, to, count); |
172 } | |
173 | |
174 // jshorts, conjoint array, atomic on each jshort | |
175 static void arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count) { | |
176 assert_params_ok(from, to, LogBytesPerShort); | |
177 pd_arrayof_conjoint_jshorts(from, to, count); | |
178 } | |
179 | |
180 // jints, conjoint array, atomic on each jint | |
181 static void arrayof_conjoint_jints(HeapWord* from, HeapWord* to, size_t count) { | |
182 assert_params_ok(from, to, LogBytesPerInt); | |
183 pd_arrayof_conjoint_jints(from, to, count); | |
184 } | |
185 | |
186 // jlongs, conjoint array, atomic on each jlong | |
187 static void arrayof_conjoint_jlongs(HeapWord* from, HeapWord* to, size_t count) { | |
188 assert_params_ok(from, to, LogBytesPerLong); | |
189 pd_arrayof_conjoint_jlongs(from, to, count); | |
190 } | |
191 | |
192 // oops, conjoint array, atomic on each oop | |
193 static void arrayof_conjoint_oops(HeapWord* from, HeapWord* to, size_t count) { | |
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194 assert_params_ok(from, to, LogBytesPerHeapOop); |
0 | 195 pd_arrayof_conjoint_oops(from, to, count); |
196 } | |
197 | |
198 // Known overlap methods | |
199 | |
200 // Copy word-aligned words from higher to lower addresses, not atomic on each word | |
201 inline static void conjoint_words_to_lower(HeapWord* from, HeapWord* to, size_t byte_count) { | |
202 // byte_count is in bytes to check its alignment | |
203 assert_params_ok(from, to, LogHeapWordSize); | |
204 assert_byte_count_ok(byte_count, HeapWordSize); | |
205 | |
206 size_t count = (size_t)round_to(byte_count, HeapWordSize) >> LogHeapWordSize; | |
207 assert(to <= from || from + count <= to, "do not overwrite source data"); | |
208 | |
209 while (count-- > 0) { | |
210 *to++ = *from++; | |
211 } | |
212 } | |
213 | |
214 // Copy word-aligned words from lower to higher addresses, not atomic on each word | |
215 inline static void conjoint_words_to_higher(HeapWord* from, HeapWord* to, size_t byte_count) { | |
216 // byte_count is in bytes to check its alignment | |
217 assert_params_ok(from, to, LogHeapWordSize); | |
218 assert_byte_count_ok(byte_count, HeapWordSize); | |
219 | |
220 size_t count = (size_t)round_to(byte_count, HeapWordSize) >> LogHeapWordSize; | |
221 assert(from <= to || to + count <= from, "do not overwrite source data"); | |
222 | |
223 from += count - 1; | |
224 to += count - 1; | |
225 while (count-- > 0) { | |
226 *to-- = *from--; | |
227 } | |
228 } | |
229 | |
230 // Fill methods | |
231 | |
232 // Fill word-aligned words, not atomic on each word | |
233 // set_words | |
234 static void fill_to_words(HeapWord* to, size_t count, juint value = 0) { | |
235 assert_params_ok(to, LogHeapWordSize); | |
236 pd_fill_to_words(to, count, value); | |
237 } | |
238 | |
239 static void fill_to_aligned_words(HeapWord* to, size_t count, juint value = 0) { | |
240 assert_params_aligned(to); | |
241 pd_fill_to_aligned_words(to, count, value); | |
242 } | |
243 | |
244 // Fill bytes | |
245 static void fill_to_bytes(void* to, size_t count, jubyte value = 0) { | |
246 pd_fill_to_bytes(to, count, value); | |
247 } | |
248 | |
249 // Fill a span of memory. If the span is an integral number of aligned | |
250 // longs, words, or ints, store to those units atomically. | |
251 // The largest atomic transfer unit is 8 bytes, or the largest power | |
252 // of two which divides both to and size, whichever is smaller. | |
253 static void fill_to_memory_atomic(void* to, size_t size, jubyte value = 0); | |
254 | |
255 // Zero-fill methods | |
256 | |
257 // Zero word-aligned words, not atomic on each word | |
258 static void zero_to_words(HeapWord* to, size_t count) { | |
259 assert_params_ok(to, LogHeapWordSize); | |
260 pd_zero_to_words(to, count); | |
261 } | |
262 | |
263 // Zero bytes | |
264 static void zero_to_bytes(void* to, size_t count) { | |
265 pd_zero_to_bytes(to, count); | |
266 } | |
267 | |
268 private: | |
269 static bool params_disjoint(HeapWord* from, HeapWord* to, size_t count) { | |
270 if (from < to) { | |
271 return pointer_delta(to, from) >= count; | |
272 } | |
273 return pointer_delta(from, to) >= count; | |
274 } | |
275 | |
276 // These methods raise a fatal if they detect a problem. | |
277 | |
278 static void assert_disjoint(HeapWord* from, HeapWord* to, size_t count) { | |
279 #ifdef ASSERT | |
280 if (!params_disjoint(from, to, count)) | |
281 basic_fatal("source and dest overlap"); | |
282 #endif | |
283 } | |
284 | |
285 static void assert_params_ok(void* from, void* to, intptr_t log_align) { | |
286 #ifdef ASSERT | |
287 if (mask_bits((uintptr_t)from, right_n_bits(log_align)) != 0) | |
288 basic_fatal("not aligned"); | |
289 if (mask_bits((uintptr_t)to, right_n_bits(log_align)) != 0) | |
290 basic_fatal("not aligned"); | |
291 #endif | |
292 } | |
293 | |
294 static void assert_params_ok(HeapWord* to, intptr_t log_align) { | |
295 #ifdef ASSERT | |
296 if (mask_bits((uintptr_t)to, right_n_bits(log_align)) != 0) | |
297 basic_fatal("not word aligned"); | |
298 #endif | |
299 } | |
300 static void assert_params_aligned(HeapWord* from, HeapWord* to) { | |
301 #ifdef ASSERT | |
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302 if (mask_bits((uintptr_t)from, BytesPerLong-1) != 0) |
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303 basic_fatal("not long aligned"); |
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304 if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0) |
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305 basic_fatal("not long aligned"); |
0 | 306 #endif |
307 } | |
308 | |
309 static void assert_params_aligned(HeapWord* to) { | |
310 #ifdef ASSERT | |
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311 if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0) |
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312 basic_fatal("not long aligned"); |
0 | 313 #endif |
314 } | |
315 | |
316 static void assert_byte_count_ok(size_t byte_count, size_t unit_size) { | |
317 #ifdef ASSERT | |
318 if ((size_t)round_to(byte_count, unit_size) != byte_count) { | |
319 basic_fatal("byte count must be aligned"); | |
320 } | |
321 #endif | |
322 } | |
323 | |
324 // Platform dependent implementations of the above methods. | |
1972 | 325 #ifdef TARGET_ARCH_x86 |
326 # include "copy_x86.hpp" | |
327 #endif | |
328 #ifdef TARGET_ARCH_sparc | |
329 # include "copy_sparc.hpp" | |
330 #endif | |
331 #ifdef TARGET_ARCH_zero | |
332 # include "copy_zero.hpp" | |
333 #endif | |
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334 #ifdef TARGET_ARCH_arm |
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335 # include "copy_arm.hpp" |
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336 #endif |
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337 #ifdef TARGET_ARCH_ppc |
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338 # include "copy_ppc.hpp" |
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339 #endif |
1972 | 340 |
0 | 341 }; |
1972 | 342 |
343 #endif // SHARE_VM_UTILITIES_COPY_HPP |