Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/copy.hpp @ 1847:a932f331ef90
6991065: missed a review comment in 6829194
Reviewed-by: kvn
author | twisti |
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date | Tue, 12 Oct 2010 02:21:06 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2008, 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 | |
25 // Assembly code for platforms that need it. | |
26 extern "C" { | |
27 void _Copy_conjoint_words(HeapWord* from, HeapWord* to, size_t count); | |
28 void _Copy_disjoint_words(HeapWord* from, HeapWord* to, size_t count); | |
29 | |
30 void _Copy_conjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count); | |
31 void _Copy_disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count); | |
32 | |
33 void _Copy_aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count); | |
34 void _Copy_aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count); | |
35 | |
36 void _Copy_conjoint_bytes(void* from, void* to, size_t count); | |
37 | |
38 void _Copy_conjoint_bytes_atomic (void* from, void* to, size_t count); | |
39 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count); | |
40 void _Copy_conjoint_jints_atomic (jint* from, jint* to, size_t count); | |
41 void _Copy_conjoint_jlongs_atomic (jlong* from, jlong* to, size_t count); | |
42 void _Copy_conjoint_oops_atomic (oop* from, oop* to, size_t count); | |
43 | |
44 void _Copy_arrayof_conjoint_bytes (HeapWord* from, HeapWord* to, size_t count); | |
45 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count); | |
46 void _Copy_arrayof_conjoint_jints (HeapWord* from, HeapWord* to, size_t count); | |
47 void _Copy_arrayof_conjoint_jlongs (HeapWord* from, HeapWord* to, size_t count); | |
48 void _Copy_arrayof_conjoint_oops (HeapWord* from, HeapWord* to, size_t count); | |
49 } | |
50 | |
51 class Copy : AllStatic { | |
52 public: | |
53 // Block copy methods have four attributes. We don't define all possibilities. | |
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54 // alignment: aligned to BytesPerLong |
0 | 55 // arrayof: arraycopy operation with both operands aligned on the same |
56 // boundary as the first element of an array of the copy unit. | |
57 // This is currently a HeapWord boundary on all platforms, except | |
58 // for long and double arrays, which are aligned on an 8-byte | |
59 // boundary on all platforms. | |
60 // arraycopy operations are implicitly atomic on each array element. | |
61 // overlap: disjoint or conjoint. | |
62 // copy unit: bytes or words (i.e., HeapWords) or oops (i.e., pointers). | |
63 // atomicity: atomic or non-atomic on the copy unit. | |
64 // | |
65 // Names are constructed thusly: | |
66 // | |
67 // [ 'aligned_' | 'arrayof_' ] | |
68 // ('conjoint_' | 'disjoint_') | |
69 // ('words' | 'bytes' | 'jshorts' | 'jints' | 'jlongs' | 'oops') | |
70 // [ '_atomic' ] | |
71 // | |
72 // Except in the arrayof case, whatever the alignment is, we assume we can copy | |
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73 // whole alignment units. E.g., if BytesPerLong is 2x word alignment, an odd |
0 | 74 // count may copy an extra word. In the arrayof case, we are allowed to copy |
75 // only the number of copy units specified. | |
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76 // |
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77 // All callees check count for 0. |
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78 // |
0 | 79 |
80 // HeapWords | |
81 | |
82 // Word-aligned words, conjoint, not atomic on each word | |
83 static void conjoint_words(HeapWord* from, HeapWord* to, size_t count) { | |
84 assert_params_ok(from, to, LogHeapWordSize); | |
85 pd_conjoint_words(from, to, count); | |
86 } | |
87 | |
88 // Word-aligned words, disjoint, not atomic on each word | |
89 static void disjoint_words(HeapWord* from, HeapWord* to, size_t count) { | |
90 assert_params_ok(from, to, LogHeapWordSize); | |
91 assert_disjoint(from, to, count); | |
92 pd_disjoint_words(from, to, count); | |
93 } | |
94 | |
95 // Word-aligned words, disjoint, atomic on each word | |
96 static void disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count) { | |
97 assert_params_ok(from, to, LogHeapWordSize); | |
98 assert_disjoint(from, to, count); | |
99 pd_disjoint_words_atomic(from, to, count); | |
100 } | |
101 | |
102 // Object-aligned words, conjoint, not atomic on each word | |
103 static void aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count) { | |
104 assert_params_aligned(from, to); | |
105 pd_aligned_conjoint_words(from, to, count); | |
106 } | |
107 | |
108 // Object-aligned words, disjoint, not atomic on each word | |
109 static void aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count) { | |
110 assert_params_aligned(from, to); | |
111 assert_disjoint(from, to, count); | |
112 pd_aligned_disjoint_words(from, to, count); | |
113 } | |
114 | |
115 // bytes, jshorts, jints, jlongs, oops | |
116 | |
117 // bytes, conjoint, not atomic on each byte (not that it matters) | |
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118 static void conjoint_jbytes(void* from, void* to, size_t count) { |
0 | 119 pd_conjoint_bytes(from, to, count); |
120 } | |
121 | |
122 // bytes, conjoint, atomic on each byte (not that it matters) | |
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123 static void conjoint_jbytes_atomic(void* from, void* to, size_t count) { |
0 | 124 pd_conjoint_bytes(from, to, count); |
125 } | |
126 | |
127 // jshorts, conjoint, atomic on each jshort | |
128 static void conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { | |
129 assert_params_ok(from, to, LogBytesPerShort); | |
130 pd_conjoint_jshorts_atomic(from, to, count); | |
131 } | |
132 | |
133 // jints, conjoint, atomic on each jint | |
134 static void conjoint_jints_atomic(jint* from, jint* to, size_t count) { | |
135 assert_params_ok(from, to, LogBytesPerInt); | |
136 pd_conjoint_jints_atomic(from, to, count); | |
137 } | |
138 | |
139 // jlongs, conjoint, atomic on each jlong | |
140 static void conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { | |
141 assert_params_ok(from, to, LogBytesPerLong); | |
142 pd_conjoint_jlongs_atomic(from, to, count); | |
143 } | |
144 | |
145 // oops, conjoint, atomic on each oop | |
146 static void conjoint_oops_atomic(oop* from, oop* to, size_t count) { | |
113
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147 assert_params_ok(from, to, LogBytesPerHeapOop); |
0 | 148 pd_conjoint_oops_atomic(from, to, count); |
149 } | |
150 | |
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151 // overloaded for UseCompressedOops |
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152 static void conjoint_oops_atomic(narrowOop* from, narrowOop* to, size_t count) { |
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153 assert(sizeof(narrowOop) == sizeof(jint), "this cast is wrong"); |
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154 assert_params_ok(from, to, LogBytesPerInt); |
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155 pd_conjoint_jints_atomic((jint*)from, (jint*)to, count); |
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156 } |
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157 |
0 | 158 // Copy a span of memory. If the span is an integral number of aligned |
159 // longs, words, or ints, copy those units atomically. | |
160 // The largest atomic transfer unit is 8 bytes, or the largest power | |
161 // of two which divides all of from, to, and size, whichever is smaller. | |
162 static void conjoint_memory_atomic(void* from, void* to, size_t size); | |
163 | |
164 // bytes, conjoint array, atomic on each byte (not that it matters) | |
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165 static void arrayof_conjoint_jbytes(HeapWord* from, HeapWord* to, size_t count) { |
0 | 166 pd_arrayof_conjoint_bytes(from, to, count); |
167 } | |
168 | |
169 // jshorts, conjoint array, atomic on each jshort | |
170 static void arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count) { | |
171 assert_params_ok(from, to, LogBytesPerShort); | |
172 pd_arrayof_conjoint_jshorts(from, to, count); | |
173 } | |
174 | |
175 // jints, conjoint array, atomic on each jint | |
176 static void arrayof_conjoint_jints(HeapWord* from, HeapWord* to, size_t count) { | |
177 assert_params_ok(from, to, LogBytesPerInt); | |
178 pd_arrayof_conjoint_jints(from, to, count); | |
179 } | |
180 | |
181 // jlongs, conjoint array, atomic on each jlong | |
182 static void arrayof_conjoint_jlongs(HeapWord* from, HeapWord* to, size_t count) { | |
183 assert_params_ok(from, to, LogBytesPerLong); | |
184 pd_arrayof_conjoint_jlongs(from, to, count); | |
185 } | |
186 | |
187 // oops, conjoint array, atomic on each oop | |
188 static void arrayof_conjoint_oops(HeapWord* from, HeapWord* to, size_t count) { | |
113
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189 assert_params_ok(from, to, LogBytesPerHeapOop); |
0 | 190 pd_arrayof_conjoint_oops(from, to, count); |
191 } | |
192 | |
193 // Known overlap methods | |
194 | |
195 // Copy word-aligned words from higher to lower addresses, not atomic on each word | |
196 inline static void conjoint_words_to_lower(HeapWord* from, HeapWord* to, size_t byte_count) { | |
197 // byte_count is in bytes to check its alignment | |
198 assert_params_ok(from, to, LogHeapWordSize); | |
199 assert_byte_count_ok(byte_count, HeapWordSize); | |
200 | |
201 size_t count = (size_t)round_to(byte_count, HeapWordSize) >> LogHeapWordSize; | |
202 assert(to <= from || from + count <= to, "do not overwrite source data"); | |
203 | |
204 while (count-- > 0) { | |
205 *to++ = *from++; | |
206 } | |
207 } | |
208 | |
209 // Copy word-aligned words from lower to higher addresses, not atomic on each word | |
210 inline static void conjoint_words_to_higher(HeapWord* from, HeapWord* to, size_t byte_count) { | |
211 // byte_count is in bytes to check its alignment | |
212 assert_params_ok(from, to, LogHeapWordSize); | |
213 assert_byte_count_ok(byte_count, HeapWordSize); | |
214 | |
215 size_t count = (size_t)round_to(byte_count, HeapWordSize) >> LogHeapWordSize; | |
216 assert(from <= to || to + count <= from, "do not overwrite source data"); | |
217 | |
218 from += count - 1; | |
219 to += count - 1; | |
220 while (count-- > 0) { | |
221 *to-- = *from--; | |
222 } | |
223 } | |
224 | |
225 // Fill methods | |
226 | |
227 // Fill word-aligned words, not atomic on each word | |
228 // set_words | |
229 static void fill_to_words(HeapWord* to, size_t count, juint value = 0) { | |
230 assert_params_ok(to, LogHeapWordSize); | |
231 pd_fill_to_words(to, count, value); | |
232 } | |
233 | |
234 static void fill_to_aligned_words(HeapWord* to, size_t count, juint value = 0) { | |
235 assert_params_aligned(to); | |
236 pd_fill_to_aligned_words(to, count, value); | |
237 } | |
238 | |
239 // Fill bytes | |
240 static void fill_to_bytes(void* to, size_t count, jubyte value = 0) { | |
241 pd_fill_to_bytes(to, count, value); | |
242 } | |
243 | |
244 // Fill a span of memory. If the span is an integral number of aligned | |
245 // longs, words, or ints, store to those units atomically. | |
246 // The largest atomic transfer unit is 8 bytes, or the largest power | |
247 // of two which divides both to and size, whichever is smaller. | |
248 static void fill_to_memory_atomic(void* to, size_t size, jubyte value = 0); | |
249 | |
250 // Zero-fill methods | |
251 | |
252 // Zero word-aligned words, not atomic on each word | |
253 static void zero_to_words(HeapWord* to, size_t count) { | |
254 assert_params_ok(to, LogHeapWordSize); | |
255 pd_zero_to_words(to, count); | |
256 } | |
257 | |
258 // Zero bytes | |
259 static void zero_to_bytes(void* to, size_t count) { | |
260 pd_zero_to_bytes(to, count); | |
261 } | |
262 | |
263 private: | |
264 static bool params_disjoint(HeapWord* from, HeapWord* to, size_t count) { | |
265 if (from < to) { | |
266 return pointer_delta(to, from) >= count; | |
267 } | |
268 return pointer_delta(from, to) >= count; | |
269 } | |
270 | |
271 // These methods raise a fatal if they detect a problem. | |
272 | |
273 static void assert_disjoint(HeapWord* from, HeapWord* to, size_t count) { | |
274 #ifdef ASSERT | |
275 if (!params_disjoint(from, to, count)) | |
276 basic_fatal("source and dest overlap"); | |
277 #endif | |
278 } | |
279 | |
280 static void assert_params_ok(void* from, void* to, intptr_t log_align) { | |
281 #ifdef ASSERT | |
282 if (mask_bits((uintptr_t)from, right_n_bits(log_align)) != 0) | |
283 basic_fatal("not aligned"); | |
284 if (mask_bits((uintptr_t)to, right_n_bits(log_align)) != 0) | |
285 basic_fatal("not aligned"); | |
286 #endif | |
287 } | |
288 | |
289 static void assert_params_ok(HeapWord* to, intptr_t log_align) { | |
290 #ifdef ASSERT | |
291 if (mask_bits((uintptr_t)to, right_n_bits(log_align)) != 0) | |
292 basic_fatal("not word aligned"); | |
293 #endif | |
294 } | |
295 static void assert_params_aligned(HeapWord* from, HeapWord* to) { | |
296 #ifdef ASSERT | |
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297 if (mask_bits((uintptr_t)from, BytesPerLong-1) != 0) |
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298 basic_fatal("not long aligned"); |
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299 if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0) |
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300 basic_fatal("not long aligned"); |
0 | 301 #endif |
302 } | |
303 | |
304 static void assert_params_aligned(HeapWord* to) { | |
305 #ifdef ASSERT | |
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306 if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0) |
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307 basic_fatal("not long aligned"); |
0 | 308 #endif |
309 } | |
310 | |
311 static void assert_byte_count_ok(size_t byte_count, size_t unit_size) { | |
312 #ifdef ASSERT | |
313 if ((size_t)round_to(byte_count, unit_size) != byte_count) { | |
314 basic_fatal("byte count must be aligned"); | |
315 } | |
316 #endif | |
317 } | |
318 | |
319 // Platform dependent implementations of the above methods. | |
320 #include "incls/_copy_pd.hpp.incl" | |
321 }; |