Mercurial > hg > truffle
annotate src/share/vm/utilities/copy.cpp @ 14206:e7b58922266b
8028412: AsyncGetCallTrace() is broken on x86 in JDK 7u40
Reviewed-by: kvn, sspitsyn
author | mgronlun |
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date | Thu, 05 Dec 2013 12:35:38 +0100 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2006, 2010, 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 #include "precompiled.hpp" |
26 #include "runtime/sharedRuntime.hpp" | |
27 #include "utilities/copy.hpp" | |
0 | 28 |
29 | |
30 // Copy bytes; larger units are filled atomically if everything is aligned. | |
31 void Copy::conjoint_memory_atomic(void* from, void* to, size_t size) { | |
32 address src = (address) from; | |
33 address dst = (address) to; | |
34 uintptr_t bits = (uintptr_t) src | (uintptr_t) dst | (uintptr_t) size; | |
35 | |
36 // (Note: We could improve performance by ignoring the low bits of size, | |
37 // and putting a short cleanup loop after each bulk copy loop. | |
38 // There are plenty of other ways to make this faster also, | |
39 // and it's a slippery slope. For now, let's keep this code simple | |
40 // since the simplicity helps clarify the atomicity semantics of | |
41 // this operation. There are also CPU-specific assembly versions | |
42 // which may or may not want to include such optimizations.) | |
43 | |
44 if (bits % sizeof(jlong) == 0) { | |
45 Copy::conjoint_jlongs_atomic((jlong*) src, (jlong*) dst, size / sizeof(jlong)); | |
46 } else if (bits % sizeof(jint) == 0) { | |
47 Copy::conjoint_jints_atomic((jint*) src, (jint*) dst, size / sizeof(jint)); | |
48 } else if (bits % sizeof(jshort) == 0) { | |
49 Copy::conjoint_jshorts_atomic((jshort*) src, (jshort*) dst, size / sizeof(jshort)); | |
50 } else { | |
51 // Not aligned, so no need to be atomic. | |
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6730276: JDI_REGRESSION tests fail with "Error: count must be non-zero" error on x86
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52 Copy::conjoint_jbytes((void*) src, (void*) dst, size); |
0 | 53 } |
54 } | |
55 | |
56 | |
57 // Fill bytes; larger units are filled atomically if everything is aligned. | |
58 void Copy::fill_to_memory_atomic(void* to, size_t size, jubyte value) { | |
59 address dst = (address) to; | |
60 uintptr_t bits = (uintptr_t) to | (uintptr_t) size; | |
61 if (bits % sizeof(jlong) == 0) { | |
62 jlong fill = (julong)( (jubyte)value ); // zero-extend | |
63 if (fill != 0) { | |
64 fill += fill << 8; | |
65 fill += fill << 16; | |
66 fill += fill << 32; | |
67 } | |
68 //Copy::fill_to_jlongs_atomic((jlong*) dst, size / sizeof(jlong)); | |
69 for (uintptr_t off = 0; off < size; off += sizeof(jlong)) { | |
70 *(jlong*)(dst + off) = fill; | |
71 } | |
72 } else if (bits % sizeof(jint) == 0) { | |
73 jint fill = (juint)( (jubyte)value ); // zero-extend | |
74 if (fill != 0) { | |
75 fill += fill << 8; | |
76 fill += fill << 16; | |
77 } | |
78 //Copy::fill_to_jints_atomic((jint*) dst, size / sizeof(jint)); | |
79 for (uintptr_t off = 0; off < size; off += sizeof(jint)) { | |
80 *(jint*)(dst + off) = fill; | |
81 } | |
82 } else if (bits % sizeof(jshort) == 0) { | |
83 jshort fill = (jushort)( (jubyte)value ); // zero-extend | |
84 fill += fill << 8; | |
85 //Copy::fill_to_jshorts_atomic((jshort*) dst, size / sizeof(jshort)); | |
86 for (uintptr_t off = 0; off < size; off += sizeof(jshort)) { | |
87 *(jshort*)(dst + off) = fill; | |
88 } | |
89 } else { | |
90 // Not aligned, so no need to be atomic. | |
91 Copy::fill_to_bytes(dst, size, value); | |
92 } | |
93 } |