Mercurial > hg > truffle
annotate src/share/vm/code/stubs.cpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17524 | 2 * Copyright (c) 1997, 2013, 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 "code/codeBlob.hpp" | |
| 27 #include "code/stubs.hpp" | |
| 28 #include "memory/allocation.inline.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 30 #include "runtime/mutexLocker.hpp" | |
| 0 | 31 |
| 32 | |
| 33 // Implementation of StubQueue | |
| 34 // | |
| 35 // Standard wrap-around queue implementation; the queue dimensions | |
| 36 // are specified by the _queue_begin & _queue_end indices. The queue | |
| 37 // can be in two states (transparent to the outside): | |
| 38 // | |
| 39 // a) contiguous state: all queue entries in one block (or empty) | |
| 40 // | |
| 41 // Queue: |...|XXXXXXX|...............| | |
| 42 // ^0 ^begin ^end ^size = limit | |
| 43 // |_______| | |
| 44 // one block | |
| 45 // | |
| 46 // b) non-contiguous state: queue entries in two blocks | |
| 47 // | |
| 48 // Queue: |XXX|.......|XXXXXXX|.......| | |
| 49 // ^0 ^end ^begin ^limit ^size | |
| 50 // |___| |_______| | |
| 51 // 1st block 2nd block | |
| 52 // | |
| 53 // In the non-contiguous state, the wrap-around point is | |
| 54 // indicated via the _buffer_limit index since the last | |
| 55 // queue entry may not fill up the queue completely in | |
| 56 // which case we need to know where the 2nd block's end | |
| 57 // is to do the proper wrap-around. When removing the | |
| 58 // last entry of the 2nd block, _buffer_limit is reset | |
| 59 // to _buffer_size. | |
| 60 // | |
| 61 // CAUTION: DO NOT MESS WITH THIS CODE IF YOU CANNOT PROVE | |
| 62 // ITS CORRECTNESS! THIS CODE IS MORE SUBTLE THAN IT LOOKS! | |
| 63 | |
| 64 | |
| 65 StubQueue::StubQueue(StubInterface* stub_interface, int buffer_size, | |
| 66 Mutex* lock, const char* name) : _mutex(lock) { | |
| 67 intptr_t size = round_to(buffer_size, 2*BytesPerWord); | |
| 68 BufferBlob* blob = BufferBlob::create(name, size); | |
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69 if( blob == NULL) { |
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70 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, err_msg("CodeCache: no room for %s", name)); |
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71 } |
| 0 | 72 _stub_interface = stub_interface; |
| 1748 | 73 _buffer_size = blob->content_size(); |
| 74 _buffer_limit = blob->content_size(); | |
| 75 _stub_buffer = blob->content_begin(); | |
| 0 | 76 _queue_begin = 0; |
| 77 _queue_end = 0; | |
| 78 _number_of_stubs = 0; | |
| 79 register_queue(this); | |
| 80 } | |
| 81 | |
| 82 | |
| 83 StubQueue::~StubQueue() { | |
| 84 // Note: Currently StubQueues are never destroyed so nothing needs to be done here. | |
| 85 // If we want to implement the destructor, we need to release the BufferBlob | |
| 86 // allocated in the constructor (i.e., we need to keep it around or look it | |
| 87 // up via CodeCache::find_blob(...). | |
| 88 Unimplemented(); | |
| 89 } | |
| 90 | |
| 91 | |
| 92 Stub* StubQueue::stub_containing(address pc) const { | |
| 93 if (contains(pc)) { | |
| 94 for (Stub* s = first(); s != NULL; s = next(s)) { | |
| 95 if (stub_contains(s, pc)) return s; | |
| 96 } | |
| 97 } | |
| 98 return NULL; | |
| 99 } | |
| 100 | |
| 101 | |
| 102 Stub* StubQueue::request_committed(int code_size) { | |
| 103 Stub* s = request(code_size); | |
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104 CodeStrings strings; |
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105 if (s != NULL) commit(code_size, strings); |
| 0 | 106 return s; |
| 107 } | |
| 108 | |
| 109 | |
| 110 Stub* StubQueue::request(int requested_code_size) { | |
| 111 assert(requested_code_size > 0, "requested_code_size must be > 0"); | |
| 112 if (_mutex != NULL) _mutex->lock(); | |
| 113 Stub* s = current_stub(); | |
| 114 int requested_size = round_to(stub_code_size_to_size(requested_code_size), CodeEntryAlignment); | |
| 115 if (requested_size <= available_space()) { | |
| 116 if (is_contiguous()) { | |
| 117 // Queue: |...|XXXXXXX|.............| | |
| 118 // ^0 ^begin ^end ^size = limit | |
| 119 assert(_buffer_limit == _buffer_size, "buffer must be fully usable"); | |
| 120 if (_queue_end + requested_size <= _buffer_size) { | |
| 121 // code fits in at the end => nothing to do | |
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122 CodeStrings strings; |
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123 stub_initialize(s, requested_size, strings); |
| 0 | 124 return s; |
| 125 } else { | |
| 126 // stub doesn't fit in at the queue end | |
| 127 // => reduce buffer limit & wrap around | |
| 128 assert(!is_empty(), "just checkin'"); | |
| 129 _buffer_limit = _queue_end; | |
| 130 _queue_end = 0; | |
| 131 } | |
| 132 } | |
| 133 } | |
| 134 if (requested_size <= available_space()) { | |
| 135 assert(!is_contiguous(), "just checkin'"); | |
| 136 assert(_buffer_limit <= _buffer_size, "queue invariant broken"); | |
| 137 // Queue: |XXX|.......|XXXXXXX|.......| | |
| 138 // ^0 ^end ^begin ^limit ^size | |
| 139 s = current_stub(); | |
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140 CodeStrings strings; |
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141 stub_initialize(s, requested_size, strings); |
| 0 | 142 return s; |
| 143 } | |
| 144 // Not enough space left | |
| 145 if (_mutex != NULL) _mutex->unlock(); | |
| 146 return NULL; | |
| 147 } | |
| 148 | |
| 149 | |
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150 void StubQueue::commit(int committed_code_size, CodeStrings& strings) { |
| 0 | 151 assert(committed_code_size > 0, "committed_code_size must be > 0"); |
| 152 int committed_size = round_to(stub_code_size_to_size(committed_code_size), CodeEntryAlignment); | |
| 153 Stub* s = current_stub(); | |
| 154 assert(committed_size <= stub_size(s), "committed size must not exceed requested size"); | |
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155 stub_initialize(s, committed_size, strings); |
| 0 | 156 _queue_end += committed_size; |
| 157 _number_of_stubs++; | |
| 158 if (_mutex != NULL) _mutex->unlock(); | |
| 159 debug_only(stub_verify(s);) | |
| 160 } | |
| 161 | |
| 162 | |
| 163 void StubQueue::remove_first() { | |
| 164 if (number_of_stubs() == 0) return; | |
| 165 Stub* s = first(); | |
| 166 debug_only(stub_verify(s);) | |
| 167 stub_finalize(s); | |
| 168 _queue_begin += stub_size(s); | |
| 169 assert(_queue_begin <= _buffer_limit, "sanity check"); | |
| 170 if (_queue_begin == _queue_end) { | |
| 171 // buffer empty | |
| 172 // => reset queue indices | |
| 173 _queue_begin = 0; | |
| 174 _queue_end = 0; | |
| 175 _buffer_limit = _buffer_size; | |
| 176 } else if (_queue_begin == _buffer_limit) { | |
| 177 // buffer limit reached | |
| 178 // => reset buffer limit & wrap around | |
| 179 _buffer_limit = _buffer_size; | |
| 180 _queue_begin = 0; | |
| 181 } | |
| 182 _number_of_stubs--; | |
| 183 } | |
| 184 | |
| 185 | |
| 186 void StubQueue::remove_first(int n) { | |
| 187 int i = MIN2(n, number_of_stubs()); | |
| 188 while (i-- > 0) remove_first(); | |
| 189 } | |
| 190 | |
| 191 | |
| 192 void StubQueue::remove_all(){ | |
| 193 debug_only(verify();) | |
| 194 remove_first(number_of_stubs()); | |
| 195 assert(number_of_stubs() == 0, "sanity check"); | |
| 196 } | |
| 197 | |
| 198 | |
| 199 enum { StubQueueLimit = 10 }; // there are only a few in the world | |
| 200 static StubQueue* registered_stub_queues[StubQueueLimit]; | |
| 201 | |
| 202 void StubQueue::register_queue(StubQueue* sq) { | |
| 203 for (int i = 0; i < StubQueueLimit; i++) { | |
| 204 if (registered_stub_queues[i] == NULL) { | |
| 205 registered_stub_queues[i] = sq; | |
| 206 return; | |
| 207 } | |
| 208 } | |
| 209 ShouldNotReachHere(); | |
| 210 } | |
| 211 | |
| 212 | |
| 213 void StubQueue::queues_do(void f(StubQueue* sq)) { | |
| 214 for (int i = 0; i < StubQueueLimit; i++) { | |
| 215 if (registered_stub_queues[i] != NULL) { | |
| 216 f(registered_stub_queues[i]); | |
| 217 } | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 | |
| 222 void StubQueue::stubs_do(void f(Stub* s)) { | |
| 223 debug_only(verify();) | |
| 224 MutexLockerEx lock(_mutex); | |
| 225 for (Stub* s = first(); s != NULL; s = next(s)) f(s); | |
| 226 } | |
| 227 | |
| 228 | |
| 229 void StubQueue::verify() { | |
| 230 // verify only if initialized | |
| 231 if (_stub_buffer == NULL) return; | |
| 232 MutexLockerEx lock(_mutex); | |
| 233 // verify index boundaries | |
| 234 guarantee(0 <= _buffer_size, "buffer size must be positive"); | |
| 235 guarantee(0 <= _buffer_limit && _buffer_limit <= _buffer_size , "_buffer_limit out of bounds"); | |
| 236 guarantee(0 <= _queue_begin && _queue_begin < _buffer_limit, "_queue_begin out of bounds"); | |
| 237 guarantee(0 <= _queue_end && _queue_end <= _buffer_limit, "_queue_end out of bounds"); | |
| 238 // verify alignment | |
| 239 guarantee(_buffer_size % CodeEntryAlignment == 0, "_buffer_size not aligned"); | |
| 240 guarantee(_buffer_limit % CodeEntryAlignment == 0, "_buffer_limit not aligned"); | |
| 241 guarantee(_queue_begin % CodeEntryAlignment == 0, "_queue_begin not aligned"); | |
| 242 guarantee(_queue_end % CodeEntryAlignment == 0, "_queue_end not aligned"); | |
| 243 // verify buffer limit/size relationship | |
| 244 if (is_contiguous()) { | |
| 245 guarantee(_buffer_limit == _buffer_size, "_buffer_limit must equal _buffer_size"); | |
| 246 } | |
| 247 // verify contents | |
| 248 int n = 0; | |
| 249 for (Stub* s = first(); s != NULL; s = next(s)) { | |
| 250 stub_verify(s); | |
| 251 n++; | |
| 252 } | |
| 253 guarantee(n == number_of_stubs(), "number of stubs inconsistent"); | |
| 254 guarantee(_queue_begin != _queue_end || n == 0, "buffer indices must be the same"); | |
| 255 } | |
| 256 | |
| 257 | |
| 258 void StubQueue::print() { | |
| 259 MutexLockerEx lock(_mutex); | |
| 260 for (Stub* s = first(); s != NULL; s = next(s)) { | |
| 261 stub_print(s); | |
| 262 } | |
| 263 } |