1 /*
2 * Copyright (c) 2012, 2019, 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 *
85 inline T JfrBigEndian::read_unaligned(const address location) {
86 assert(location != NULL, "just checking");
87 switch (sizeof(T)) {
88 case sizeof(u1) :
89 return read_bytes<u1>(location);
90 case sizeof(u2):
91 return read_bytes<u2>(location);
92 case sizeof(u4):
93 return read_bytes<u4>(location);
94 case sizeof(u8):
95 return read_bytes<u8>(location);
96 default:
97 assert(false, "not reach");
98 }
99 return 0;
100 }
101
102 inline bool JfrBigEndian::platform_supports_unaligned_reads(void) {
103 #if defined(IA32) || defined(AMD64) || defined(PPC) || defined(S390)
104 return true;
105 #elif defined(SPARC) || defined(ARM) || defined(AARCH64)
106 return false;
107 #else
108 #warning "Unconfigured platform"
109 return false;
110 #endif
111 }
112
113 template<typename T>
114 inline T JfrBigEndian::read(const void* location) {
115 assert(location != NULL, "just checking");
116 assert(sizeof(T) <= sizeof(u8), "no support for arbitrary sizes");
117 if (sizeof(T) == sizeof(u1)) {
118 return *(T*)location;
119 }
120 if (is_aligned(location, sizeof(T)) || platform_supports_unaligned_reads()) {
121 // fastest case
122 switch (sizeof(T)) {
123 case sizeof(u1):
124 return *(T*)location;
125 case sizeof(u2):
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1 /*
2 * Copyright (c) 2012, 2020, 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 *
85 inline T JfrBigEndian::read_unaligned(const address location) {
86 assert(location != NULL, "just checking");
87 switch (sizeof(T)) {
88 case sizeof(u1) :
89 return read_bytes<u1>(location);
90 case sizeof(u2):
91 return read_bytes<u2>(location);
92 case sizeof(u4):
93 return read_bytes<u4>(location);
94 case sizeof(u8):
95 return read_bytes<u8>(location);
96 default:
97 assert(false, "not reach");
98 }
99 return 0;
100 }
101
102 inline bool JfrBigEndian::platform_supports_unaligned_reads(void) {
103 #if defined(IA32) || defined(AMD64) || defined(PPC) || defined(S390)
104 return true;
105 #elif defined(ARM) || defined(AARCH64)
106 return false;
107 #else
108 #warning "Unconfigured platform"
109 return false;
110 #endif
111 }
112
113 template<typename T>
114 inline T JfrBigEndian::read(const void* location) {
115 assert(location != NULL, "just checking");
116 assert(sizeof(T) <= sizeof(u8), "no support for arbitrary sizes");
117 if (sizeof(T) == sizeof(u1)) {
118 return *(T*)location;
119 }
120 if (is_aligned(location, sizeof(T)) || platform_supports_unaligned_reads()) {
121 // fastest case
122 switch (sizeof(T)) {
123 case sizeof(u1):
124 return *(T*)location;
125 case sizeof(u2):
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