Mercurial > hg > graal-compiler
annotate src/share/vm/code/codeCache.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 1d7922586cf6 |
| children | 8966c2d65d96 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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/codeCache.hpp" | |
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28 #include "code/compiledIC.hpp" |
| 1972 | 29 #include "code/dependencies.hpp" |
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30 #include "code/icBuffer.hpp" |
| 1972 | 31 #include "code/nmethod.hpp" |
| 32 #include "code/pcDesc.hpp" | |
| 33 #include "gc_implementation/shared/markSweep.hpp" | |
| 34 #include "memory/allocation.inline.hpp" | |
| 35 #include "memory/gcLocker.hpp" | |
| 36 #include "memory/iterator.hpp" | |
| 37 #include "memory/resourceArea.hpp" | |
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38 #include "oops/method.hpp" |
| 1972 | 39 #include "oops/objArrayOop.hpp" |
| 40 #include "oops/oop.inline.hpp" | |
| 41 #include "runtime/handles.inline.hpp" | |
| 42 #include "runtime/icache.hpp" | |
| 43 #include "runtime/java.hpp" | |
| 44 #include "runtime/mutexLocker.hpp" | |
| 45 #include "services/memoryService.hpp" | |
| 46 #include "utilities/xmlstream.hpp" | |
| 0 | 47 |
| 48 // Helper class for printing in CodeCache | |
| 49 | |
| 50 class CodeBlob_sizes { | |
| 51 private: | |
| 52 int count; | |
| 53 int total_size; | |
| 54 int header_size; | |
| 55 int code_size; | |
| 56 int stub_size; | |
| 57 int relocation_size; | |
| 58 int scopes_oop_size; | |
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59 int scopes_metadata_size; |
| 0 | 60 int scopes_data_size; |
| 61 int scopes_pcs_size; | |
| 62 | |
| 63 public: | |
| 64 CodeBlob_sizes() { | |
| 65 count = 0; | |
| 66 total_size = 0; | |
| 67 header_size = 0; | |
| 68 code_size = 0; | |
| 69 stub_size = 0; | |
| 70 relocation_size = 0; | |
| 71 scopes_oop_size = 0; | |
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72 scopes_metadata_size = 0; |
| 0 | 73 scopes_data_size = 0; |
| 74 scopes_pcs_size = 0; | |
| 75 } | |
| 76 | |
| 77 int total() { return total_size; } | |
| 78 bool is_empty() { return count == 0; } | |
| 79 | |
| 80 void print(const char* title) { | |
| 81 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])", | |
| 82 count, | |
| 83 title, | |
| 84 total() / K, | |
| 85 header_size * 100 / total_size, | |
| 86 relocation_size * 100 / total_size, | |
| 87 code_size * 100 / total_size, | |
| 88 stub_size * 100 / total_size, | |
| 89 scopes_oop_size * 100 / total_size, | |
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90 scopes_metadata_size * 100 / total_size, |
| 0 | 91 scopes_data_size * 100 / total_size, |
| 92 scopes_pcs_size * 100 / total_size); | |
| 93 } | |
| 94 | |
| 95 void add(CodeBlob* cb) { | |
| 96 count++; | |
| 97 total_size += cb->size(); | |
| 98 header_size += cb->header_size(); | |
| 99 relocation_size += cb->relocation_size(); | |
| 100 if (cb->is_nmethod()) { | |
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101 nmethod* nm = cb->as_nmethod_or_null(); |
| 1748 | 102 code_size += nm->insts_size(); |
| 0 | 103 stub_size += nm->stub_size(); |
| 104 | |
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105 scopes_oop_size += nm->oops_size(); |
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106 scopes_metadata_size += nm->metadata_size(); |
| 0 | 107 scopes_data_size += nm->scopes_data_size(); |
| 108 scopes_pcs_size += nm->scopes_pcs_size(); | |
| 109 } else { | |
| 1748 | 110 code_size += cb->code_size(); |
| 0 | 111 } |
| 112 } | |
| 113 }; | |
| 114 | |
| 115 | |
| 116 // CodeCache implementation | |
| 117 | |
| 118 CodeHeap * CodeCache::_heap = new CodeHeap(); | |
| 119 int CodeCache::_number_of_blobs = 0; | |
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120 int CodeCache::_number_of_adapters = 0; |
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121 int CodeCache::_number_of_nmethods = 0; |
| 0 | 122 int CodeCache::_number_of_nmethods_with_dependencies = 0; |
| 123 bool CodeCache::_needs_cache_clean = false; | |
| 989 | 124 nmethod* CodeCache::_scavenge_root_nmethods = NULL; |
| 1202 | 125 nmethod* CodeCache::_saved_nmethods = NULL; |
| 0 | 126 |
| 127 | |
| 128 CodeBlob* CodeCache::first() { | |
| 129 assert_locked_or_safepoint(CodeCache_lock); | |
| 130 return (CodeBlob*)_heap->first(); | |
| 131 } | |
| 132 | |
| 133 | |
| 134 CodeBlob* CodeCache::next(CodeBlob* cb) { | |
| 135 assert_locked_or_safepoint(CodeCache_lock); | |
| 136 return (CodeBlob*)_heap->next(cb); | |
| 137 } | |
| 138 | |
| 139 | |
| 140 CodeBlob* CodeCache::alive(CodeBlob *cb) { | |
| 141 assert_locked_or_safepoint(CodeCache_lock); | |
| 142 while (cb != NULL && !cb->is_alive()) cb = next(cb); | |
| 143 return cb; | |
| 144 } | |
| 145 | |
| 146 | |
| 147 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) { | |
| 148 assert_locked_or_safepoint(CodeCache_lock); | |
| 149 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb); | |
| 150 return (nmethod*)cb; | |
| 151 } | |
| 152 | |
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153 nmethod* CodeCache::first_nmethod() { |
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154 assert_locked_or_safepoint(CodeCache_lock); |
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155 CodeBlob* cb = first(); |
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156 while (cb != NULL && !cb->is_nmethod()) { |
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157 cb = next(cb); |
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158 } |
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159 return (nmethod*)cb; |
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160 } |
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161 |
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162 nmethod* CodeCache::next_nmethod (CodeBlob* cb) { |
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163 assert_locked_or_safepoint(CodeCache_lock); |
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164 cb = next(cb); |
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165 while (cb != NULL && !cb->is_nmethod()) { |
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166 cb = next(cb); |
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167 } |
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168 return (nmethod*)cb; |
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169 } |
| 0 | 170 |
| 171 CodeBlob* CodeCache::allocate(int size) { | |
| 172 // Do not seize the CodeCache lock here--if the caller has not | |
| 173 // already done so, we are going to lose bigtime, since the code | |
| 174 // cache will contain a garbage CodeBlob until the caller can | |
| 175 // run the constructor for the CodeBlob subclass he is busy | |
| 176 // instantiating. | |
| 177 guarantee(size >= 0, "allocation request must be reasonable"); | |
| 178 assert_locked_or_safepoint(CodeCache_lock); | |
| 179 CodeBlob* cb = NULL; | |
| 180 _number_of_blobs++; | |
| 181 while (true) { | |
| 182 cb = (CodeBlob*)_heap->allocate(size); | |
| 183 if (cb != NULL) break; | |
| 184 if (!_heap->expand_by(CodeCacheExpansionSize)) { | |
| 185 // Expansion failed | |
| 186 return NULL; | |
| 187 } | |
| 188 if (PrintCodeCacheExtension) { | |
| 189 ResourceMark rm; | |
| 190 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)", | |
| 191 (intptr_t)_heap->begin(), (intptr_t)_heap->end(), | |
| 192 (address)_heap->end() - (address)_heap->begin()); | |
| 193 } | |
| 194 } | |
| 195 verify_if_often(); | |
| 989 | 196 print_trace("allocation", cb, size); |
| 0 | 197 return cb; |
| 198 } | |
| 199 | |
| 200 void CodeCache::free(CodeBlob* cb) { | |
| 201 assert_locked_or_safepoint(CodeCache_lock); | |
| 202 verify_if_often(); | |
| 203 | |
| 989 | 204 print_trace("free", cb); |
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205 if (cb->is_nmethod()) { |
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206 _number_of_nmethods--; |
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207 if (((nmethod *)cb)->has_dependencies()) { |
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208 _number_of_nmethods_with_dependencies--; |
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209 } |
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210 } |
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211 if (cb->is_adapter_blob()) { |
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212 _number_of_adapters--; |
| 0 | 213 } |
| 214 _number_of_blobs--; | |
| 215 | |
| 216 _heap->deallocate(cb); | |
| 217 | |
| 218 verify_if_often(); | |
| 219 assert(_number_of_blobs >= 0, "sanity check"); | |
| 220 } | |
| 221 | |
| 222 | |
| 223 void CodeCache::commit(CodeBlob* cb) { | |
| 224 // this is called by nmethod::nmethod, which must already own CodeCache_lock | |
| 225 assert_locked_or_safepoint(CodeCache_lock); | |
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226 if (cb->is_nmethod()) { |
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227 _number_of_nmethods++; |
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228 if (((nmethod *)cb)->has_dependencies()) { |
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229 _number_of_nmethods_with_dependencies++; |
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230 } |
| 0 | 231 } |
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232 if (cb->is_adapter_blob()) { |
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233 _number_of_adapters++; |
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234 } |
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235 |
| 0 | 236 // flush the hardware I-cache |
| 1748 | 237 ICache::invalidate_range(cb->content_begin(), cb->content_size()); |
| 0 | 238 } |
| 239 | |
| 240 | |
| 241 void CodeCache::flush() { | |
| 242 assert_locked_or_safepoint(CodeCache_lock); | |
| 243 Unimplemented(); | |
| 244 } | |
| 245 | |
| 246 | |
| 247 // Iteration over CodeBlobs | |
| 248 | |
| 249 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) ) | |
| 250 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var))) | |
| 251 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var))) | |
| 252 | |
| 253 | |
| 254 bool CodeCache::contains(void *p) { | |
| 255 // It should be ok to call contains without holding a lock | |
| 256 return _heap->contains(p); | |
| 257 } | |
| 258 | |
| 259 | |
| 260 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not | |
| 261 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain | |
| 262 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled. | |
| 263 CodeBlob* CodeCache::find_blob(void* start) { | |
| 264 CodeBlob* result = find_blob_unsafe(start); | |
| 265 if (result == NULL) return NULL; | |
| 266 // We could potientially look up non_entrant methods | |
| 267 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method"); | |
| 268 return result; | |
| 269 } | |
| 270 | |
| 271 nmethod* CodeCache::find_nmethod(void* start) { | |
| 272 CodeBlob *cb = find_blob(start); | |
| 273 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod"); | |
| 274 return (nmethod*)cb; | |
| 275 } | |
| 276 | |
| 277 | |
| 278 void CodeCache::blobs_do(void f(CodeBlob* nm)) { | |
| 279 assert_locked_or_safepoint(CodeCache_lock); | |
| 280 FOR_ALL_BLOBS(p) { | |
| 281 f(p); | |
| 282 } | |
| 283 } | |
| 284 | |
| 285 | |
| 286 void CodeCache::nmethods_do(void f(nmethod* nm)) { | |
| 287 assert_locked_or_safepoint(CodeCache_lock); | |
| 288 FOR_ALL_BLOBS(nm) { | |
| 289 if (nm->is_nmethod()) f((nmethod*)nm); | |
| 290 } | |
| 291 } | |
| 292 | |
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293 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) { |
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294 assert_locked_or_safepoint(CodeCache_lock); |
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295 FOR_ALL_ALIVE_NMETHODS(nm) { |
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296 f(nm); |
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297 } |
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298 } |
| 0 | 299 |
| 300 int CodeCache::alignment_unit() { | |
| 301 return (int)_heap->alignment_unit(); | |
| 302 } | |
| 303 | |
| 304 | |
| 305 int CodeCache::alignment_offset() { | |
| 306 return (int)_heap->alignment_offset(); | |
| 307 } | |
| 308 | |
| 309 | |
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310 // Mark nmethods for unloading if they contain otherwise unreachable |
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311 // oops. |
| 0 | 312 void CodeCache::do_unloading(BoolObjectClosure* is_alive, |
| 313 OopClosure* keep_alive, | |
| 314 bool unloading_occurred) { | |
| 315 assert_locked_or_safepoint(CodeCache_lock); | |
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316 FOR_ALL_ALIVE_NMETHODS(nm) { |
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317 nm->do_unloading(is_alive, keep_alive, unloading_occurred); |
| 0 | 318 } |
| 319 } | |
| 320 | |
| 989 | 321 void CodeCache::blobs_do(CodeBlobClosure* f) { |
| 0 | 322 assert_locked_or_safepoint(CodeCache_lock); |
| 323 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 989 | 324 f->do_code_blob(cb); |
| 325 | |
| 326 #ifdef ASSERT | |
| 327 if (cb->is_nmethod()) | |
| 328 ((nmethod*)cb)->verify_scavenge_root_oops(); | |
| 329 #endif //ASSERT | |
| 0 | 330 } |
| 331 } | |
| 332 | |
| 989 | 333 // Walk the list of methods which might contain non-perm oops. |
| 334 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) { | |
| 335 assert_locked_or_safepoint(CodeCache_lock); | |
| 336 debug_only(mark_scavenge_root_nmethods()); | |
| 337 | |
| 338 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
| 339 debug_only(cur->clear_scavenge_root_marked()); | |
| 340 assert(cur->scavenge_root_not_marked(), ""); | |
| 341 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 342 | |
| 343 bool is_live = (!cur->is_zombie() && !cur->is_unloaded()); | |
| 344 #ifndef PRODUCT | |
| 345 if (TraceScavenge) { | |
| 346 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr(); | |
| 347 } | |
| 348 #endif //PRODUCT | |
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349 if (is_live) { |
| 989 | 350 // Perform cur->oops_do(f), maybe just once per nmethod. |
| 351 f->do_code_blob(cur); | |
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352 } |
| 989 | 353 } |
| 354 | |
| 355 // Check for stray marks. | |
| 356 debug_only(verify_perm_nmethods(NULL)); | |
| 357 } | |
| 358 | |
| 359 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) { | |
| 360 assert_locked_or_safepoint(CodeCache_lock); | |
| 361 nm->set_on_scavenge_root_list(); | |
| 362 nm->set_scavenge_root_link(_scavenge_root_nmethods); | |
| 363 set_scavenge_root_nmethods(nm); | |
| 364 print_trace("add_scavenge_root", nm); | |
| 365 } | |
| 366 | |
| 367 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) { | |
| 368 assert_locked_or_safepoint(CodeCache_lock); | |
| 369 print_trace("drop_scavenge_root", nm); | |
| 370 nmethod* last = NULL; | |
| 371 nmethod* cur = scavenge_root_nmethods(); | |
| 372 while (cur != NULL) { | |
| 373 nmethod* next = cur->scavenge_root_link(); | |
| 374 if (cur == nm) { | |
| 375 if (last != NULL) | |
| 376 last->set_scavenge_root_link(next); | |
| 377 else set_scavenge_root_nmethods(next); | |
| 378 nm->set_scavenge_root_link(NULL); | |
| 379 nm->clear_on_scavenge_root_list(); | |
| 380 return; | |
| 381 } | |
| 382 last = cur; | |
| 383 cur = next; | |
| 384 } | |
| 385 assert(false, "should have been on list"); | |
| 386 } | |
| 387 | |
| 388 void CodeCache::prune_scavenge_root_nmethods() { | |
| 389 assert_locked_or_safepoint(CodeCache_lock); | |
| 390 debug_only(mark_scavenge_root_nmethods()); | |
| 391 | |
| 392 nmethod* last = NULL; | |
| 393 nmethod* cur = scavenge_root_nmethods(); | |
| 394 while (cur != NULL) { | |
| 395 nmethod* next = cur->scavenge_root_link(); | |
| 396 debug_only(cur->clear_scavenge_root_marked()); | |
| 397 assert(cur->scavenge_root_not_marked(), ""); | |
| 398 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 399 | |
| 400 if (!cur->is_zombie() && !cur->is_unloaded() | |
| 401 && cur->detect_scavenge_root_oops()) { | |
| 402 // Keep it. Advance 'last' to prevent deletion. | |
| 403 last = cur; | |
| 404 } else { | |
| 405 // Prune it from the list, so we don't have to look at it any more. | |
| 406 print_trace("prune_scavenge_root", cur); | |
| 407 cur->set_scavenge_root_link(NULL); | |
| 408 cur->clear_on_scavenge_root_list(); | |
| 409 if (last != NULL) | |
| 410 last->set_scavenge_root_link(next); | |
| 411 else set_scavenge_root_nmethods(next); | |
| 412 } | |
| 413 cur = next; | |
| 414 } | |
| 415 | |
| 416 // Check for stray marks. | |
| 417 debug_only(verify_perm_nmethods(NULL)); | |
| 418 } | |
| 419 | |
| 420 #ifndef PRODUCT | |
| 421 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) { | |
| 422 // While we are here, verify the integrity of the list. | |
| 423 mark_scavenge_root_nmethods(); | |
| 424 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
| 425 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 426 cur->clear_scavenge_root_marked(); | |
| 427 } | |
| 428 verify_perm_nmethods(f); | |
| 429 } | |
| 430 | |
| 431 // Temporarily mark nmethods that are claimed to be on the non-perm list. | |
| 432 void CodeCache::mark_scavenge_root_nmethods() { | |
| 433 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 434 if (cb->is_nmethod()) { | |
| 435 nmethod *nm = (nmethod*)cb; | |
| 436 assert(nm->scavenge_root_not_marked(), "clean state"); | |
| 437 if (nm->on_scavenge_root_list()) | |
| 438 nm->set_scavenge_root_marked(); | |
| 439 } | |
| 440 } | |
| 441 } | |
| 442 | |
| 443 // If the closure is given, run it on the unlisted nmethods. | |
| 444 // Also make sure that the effects of mark_scavenge_root_nmethods is gone. | |
| 445 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) { | |
| 446 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 447 bool call_f = (f_or_null != NULL); | |
| 448 if (cb->is_nmethod()) { | |
| 449 nmethod *nm = (nmethod*)cb; | |
| 450 assert(nm->scavenge_root_not_marked(), "must be already processed"); | |
| 451 if (nm->on_scavenge_root_list()) | |
| 452 call_f = false; // don't show this one to the client | |
| 453 nm->verify_scavenge_root_oops(); | |
| 454 } else { | |
| 455 call_f = false; // not an nmethod | |
| 456 } | |
| 457 if (call_f) f_or_null->do_code_blob(cb); | |
| 458 } | |
| 459 } | |
| 460 #endif //PRODUCT | |
| 461 | |
| 1202 | 462 |
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463 nmethod* CodeCache::find_and_remove_saved_code(Method* m) { |
| 1202 | 464 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
| 465 nmethod* saved = _saved_nmethods; | |
| 466 nmethod* prev = NULL; | |
| 467 while (saved != NULL) { | |
| 468 if (saved->is_in_use() && saved->method() == m) { | |
| 469 if (prev != NULL) { | |
| 470 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
| 471 } else { | |
| 472 _saved_nmethods = saved->saved_nmethod_link(); | |
| 473 } | |
| 474 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods"); | |
| 475 saved->set_speculatively_disconnected(false); | |
| 476 saved->set_saved_nmethod_link(NULL); | |
| 477 if (PrintMethodFlushing) { | |
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478 saved->print_on(tty, " ### nmethod is reconnected\n"); |
| 1202 | 479 } |
| 480 if (LogCompilation && (xtty != NULL)) { | |
| 481 ttyLocker ttyl; | |
| 482 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id()); | |
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483 xtty->method(m); |
| 1202 | 484 xtty->stamp(); |
| 485 xtty->end_elem(); | |
| 486 } | |
| 487 return saved; | |
| 488 } | |
| 489 prev = saved; | |
| 490 saved = saved->saved_nmethod_link(); | |
| 491 } | |
| 492 return NULL; | |
| 493 } | |
| 494 | |
| 495 void CodeCache::remove_saved_code(nmethod* nm) { | |
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496 // For conc swpr this will be called with CodeCache_lock taken by caller |
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497 assert_locked_or_safepoint(CodeCache_lock); |
| 1202 | 498 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods"); |
| 499 nmethod* saved = _saved_nmethods; | |
| 500 nmethod* prev = NULL; | |
| 501 while (saved != NULL) { | |
| 502 if (saved == nm) { | |
| 503 if (prev != NULL) { | |
| 504 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
| 505 } else { | |
| 506 _saved_nmethods = saved->saved_nmethod_link(); | |
| 507 } | |
| 508 if (LogCompilation && (xtty != NULL)) { | |
| 509 ttyLocker ttyl; | |
| 510 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id()); | |
| 511 xtty->stamp(); | |
| 512 xtty->end_elem(); | |
| 513 } | |
| 514 return; | |
| 515 } | |
| 516 prev = saved; | |
| 517 saved = saved->saved_nmethod_link(); | |
| 518 } | |
| 519 ShouldNotReachHere(); | |
| 520 } | |
| 521 | |
| 522 void CodeCache::speculatively_disconnect(nmethod* nm) { | |
| 523 assert_locked_or_safepoint(CodeCache_lock); | |
| 524 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods"); | |
| 525 nm->set_saved_nmethod_link(_saved_nmethods); | |
| 526 _saved_nmethods = nm; | |
| 527 if (PrintMethodFlushing) { | |
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528 nm->print_on(tty, " ### nmethod is speculatively disconnected\n"); |
| 1202 | 529 } |
| 530 if (LogCompilation && (xtty != NULL)) { | |
| 531 ttyLocker ttyl; | |
| 532 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id()); | |
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533 xtty->method(nm->method()); |
| 1202 | 534 xtty->stamp(); |
| 535 xtty->end_elem(); | |
| 536 } | |
| 537 nm->method()->clear_code(); | |
| 538 nm->set_speculatively_disconnected(true); | |
| 539 } | |
| 540 | |
| 541 | |
| 0 | 542 void CodeCache::gc_prologue() { |
| 989 | 543 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called"); |
| 0 | 544 } |
| 545 | |
| 546 | |
| 547 void CodeCache::gc_epilogue() { | |
| 548 assert_locked_or_safepoint(CodeCache_lock); | |
| 549 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 550 if (cb->is_nmethod()) { | |
| 551 nmethod *nm = (nmethod*)cb; | |
| 552 assert(!nm->is_unloaded(), "Tautology"); | |
| 553 if (needs_cache_clean()) { | |
| 554 nm->cleanup_inline_caches(); | |
| 555 } | |
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556 DEBUG_ONLY(nm->verify()); |
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557 nm->fix_oop_relocations(); |
| 0 | 558 } |
| 559 } | |
| 560 set_needs_cache_clean(false); | |
| 989 | 561 prune_scavenge_root_nmethods(); |
| 562 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); | |
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563 |
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564 #ifdef ASSERT |
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565 // make sure that we aren't leaking icholders |
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566 int count = 0; |
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567 FOR_ALL_BLOBS(cb) { |
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568 if (cb->is_nmethod()) { |
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569 RelocIterator iter((nmethod*)cb); |
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570 while(iter.next()) { |
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571 if (iter.type() == relocInfo::virtual_call_type) { |
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572 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { |
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573 CompiledIC *ic = CompiledIC_at(iter.reloc()); |
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574 if (TraceCompiledIC) { |
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575 tty->print("noticed icholder " INTPTR_FORMAT " ", ic->cached_icholder()); |
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576 ic->print(); |
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577 } |
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578 assert(ic->cached_icholder() != NULL, "must be non-NULL"); |
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579 count++; |
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580 } |
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581 } |
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582 } |
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583 } |
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584 } |
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585 |
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586 assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() == |
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587 CompiledICHolder::live_count(), "must agree"); |
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588 #endif |
| 0 | 589 } |
| 590 | |
| 591 | |
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592 void CodeCache::verify_oops() { |
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593 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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594 VerifyOopClosure voc; |
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595 FOR_ALL_ALIVE_BLOBS(cb) { |
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596 if (cb->is_nmethod()) { |
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597 nmethod *nm = (nmethod*)cb; |
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598 nm->oops_do(&voc); |
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599 nm->verify_oop_relocations(); |
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600 } |
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601 } |
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602 } |
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603 |
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604 |
| 0 | 605 address CodeCache::first_address() { |
| 606 assert_locked_or_safepoint(CodeCache_lock); | |
| 607 return (address)_heap->begin(); | |
| 608 } | |
| 609 | |
| 610 | |
| 611 address CodeCache::last_address() { | |
| 612 assert_locked_or_safepoint(CodeCache_lock); | |
| 613 return (address)_heap->end(); | |
| 614 } | |
| 615 | |
| 616 | |
| 617 void icache_init(); | |
| 618 | |
| 619 void CodeCache::initialize() { | |
| 620 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points"); | |
| 621 #ifdef COMPILER2 | |
| 622 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops"); | |
| 623 #endif | |
| 624 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants"); | |
| 625 // This was originally just a check of the alignment, causing failure, instead, round | |
| 626 // the code cache to the page size. In particular, Solaris is moving to a larger | |
| 627 // default page size. | |
| 628 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size()); | |
| 629 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size()); | |
| 630 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size()); | |
| 631 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) { | |
| 632 vm_exit_during_initialization("Could not reserve enough space for code cache"); | |
| 633 } | |
| 634 | |
| 635 MemoryService::add_code_heap_memory_pool(_heap); | |
| 636 | |
| 637 // Initialize ICache flush mechanism | |
| 638 // This service is needed for os::register_code_area | |
| 639 icache_init(); | |
| 640 | |
| 641 // Give OS a chance to register generated code area. | |
| 642 // This is used on Windows 64 bit platforms to register | |
| 643 // Structured Exception Handlers for our generated code. | |
| 644 os::register_code_area(_heap->low_boundary(), _heap->high_boundary()); | |
| 645 } | |
| 646 | |
| 647 | |
| 648 void codeCache_init() { | |
| 649 CodeCache::initialize(); | |
| 650 } | |
| 651 | |
| 652 //------------------------------------------------------------------------------------------------ | |
| 653 | |
| 654 int CodeCache::number_of_nmethods_with_dependencies() { | |
| 655 return _number_of_nmethods_with_dependencies; | |
| 656 } | |
| 657 | |
| 658 void CodeCache::clear_inline_caches() { | |
| 659 assert_locked_or_safepoint(CodeCache_lock); | |
| 660 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 661 nm->clear_inline_caches(); | |
| 662 } | |
| 663 } | |
| 664 | |
| 665 #ifndef PRODUCT | |
| 666 // used to keep track of how much time is spent in mark_for_deoptimization | |
| 667 static elapsedTimer dependentCheckTime; | |
| 668 static int dependentCheckCount = 0; | |
| 669 #endif // PRODUCT | |
| 670 | |
| 671 | |
| 672 int CodeCache::mark_for_deoptimization(DepChange& changes) { | |
| 673 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 674 | |
| 675 #ifndef PRODUCT | |
| 676 dependentCheckTime.start(); | |
| 677 dependentCheckCount++; | |
| 678 #endif // PRODUCT | |
| 679 | |
| 680 int number_of_marked_CodeBlobs = 0; | |
| 681 | |
| 682 // search the hierarchy looking for nmethods which are affected by the loading of this class | |
| 683 | |
| 684 // then search the interfaces this class implements looking for nmethods | |
| 685 // which might be dependent of the fact that an interface only had one | |
| 686 // implementor. | |
| 687 | |
| 688 { No_Safepoint_Verifier nsv; | |
| 689 for (DepChange::ContextStream str(changes, nsv); str.next(); ) { | |
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690 Klass* d = str.klass(); |
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691 number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes); |
| 0 | 692 } |
| 693 } | |
| 694 | |
| 695 if (VerifyDependencies) { | |
| 696 // Turn off dependency tracing while actually testing deps. | |
| 697 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); | |
| 698 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 699 if (!nm->is_marked_for_deoptimization() && | |
| 700 nm->check_all_dependencies()) { | |
| 701 ResourceMark rm; | |
| 702 tty->print_cr("Should have been marked for deoptimization:"); | |
| 703 changes.print(); | |
| 704 nm->print(); | |
| 705 nm->print_dependencies(); | |
| 706 } | |
| 707 } | |
| 708 } | |
| 709 | |
| 710 #ifndef PRODUCT | |
| 711 dependentCheckTime.stop(); | |
| 712 #endif // PRODUCT | |
| 713 | |
| 714 return number_of_marked_CodeBlobs; | |
| 715 } | |
| 716 | |
| 717 | |
| 718 #ifdef HOTSWAP | |
| 719 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) { | |
| 720 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 721 int number_of_marked_CodeBlobs = 0; | |
| 722 | |
| 723 // Deoptimize all methods of the evolving class itself | |
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724 Array<Method*>* old_methods = dependee->methods(); |
| 0 | 725 for (int i = 0; i < old_methods->length(); i++) { |
| 726 ResourceMark rm; | |
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727 Method* old_method = old_methods->at(i); |
| 0 | 728 nmethod *nm = old_method->code(); |
| 729 if (nm != NULL) { | |
| 730 nm->mark_for_deoptimization(); | |
| 731 number_of_marked_CodeBlobs++; | |
| 732 } | |
| 733 } | |
| 734 | |
| 735 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 736 if (nm->is_marked_for_deoptimization()) { | |
| 737 // ...Already marked in the previous pass; don't count it again. | |
| 738 } else if (nm->is_evol_dependent_on(dependee())) { | |
| 739 ResourceMark rm; | |
| 740 nm->mark_for_deoptimization(); | |
| 741 number_of_marked_CodeBlobs++; | |
| 742 } else { | |
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743 // flush caches in case they refer to a redefined Method* |
| 0 | 744 nm->clear_inline_caches(); |
| 745 } | |
| 746 } | |
| 747 | |
| 748 return number_of_marked_CodeBlobs; | |
| 749 } | |
| 750 #endif // HOTSWAP | |
| 751 | |
| 752 | |
| 753 // Deoptimize all methods | |
| 754 void CodeCache::mark_all_nmethods_for_deoptimization() { | |
| 755 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 756 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 757 nm->mark_for_deoptimization(); | |
| 758 } | |
| 759 } | |
| 760 | |
| 761 | |
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762 int CodeCache::mark_for_deoptimization(Method* dependee) { |
| 0 | 763 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
| 764 int number_of_marked_CodeBlobs = 0; | |
| 765 | |
| 766 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 767 if (nm->is_dependent_on_method(dependee)) { | |
| 768 ResourceMark rm; | |
| 769 nm->mark_for_deoptimization(); | |
| 770 number_of_marked_CodeBlobs++; | |
| 771 } | |
| 772 } | |
| 773 | |
| 774 return number_of_marked_CodeBlobs; | |
| 775 } | |
| 776 | |
| 777 void CodeCache::make_marked_nmethods_zombies() { | |
| 778 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 779 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 780 if (nm->is_marked_for_deoptimization()) { | |
| 781 | |
| 782 // If the nmethod has already been made non-entrant and it can be converted | |
| 783 // then zombie it now. Otherwise make it non-entrant and it will eventually | |
| 784 // be zombied when it is no longer seen on the stack. Note that the nmethod | |
| 785 // might be "entrant" and not on the stack and so could be zombied immediately | |
| 786 // but we can't tell because we don't track it on stack until it becomes | |
| 787 // non-entrant. | |
| 788 | |
| 789 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) { | |
| 790 nm->make_zombie(); | |
| 791 } else { | |
| 792 nm->make_not_entrant(); | |
| 793 } | |
| 794 } | |
| 795 } | |
| 796 } | |
| 797 | |
| 798 void CodeCache::make_marked_nmethods_not_entrant() { | |
| 799 assert_locked_or_safepoint(CodeCache_lock); | |
| 800 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 801 if (nm->is_marked_for_deoptimization()) { | |
| 802 nm->make_not_entrant(); | |
| 803 } | |
| 804 } | |
| 805 } | |
| 806 | |
| 807 void CodeCache::verify() { | |
| 808 _heap->verify(); | |
| 809 FOR_ALL_ALIVE_BLOBS(p) { | |
| 810 p->verify(); | |
| 811 } | |
| 812 } | |
| 813 | |
| 814 //------------------------------------------------------------------------------------------------ | |
| 815 // Non-product version | |
| 816 | |
| 817 #ifndef PRODUCT | |
| 818 | |
| 819 void CodeCache::verify_if_often() { | |
| 820 if (VerifyCodeCacheOften) { | |
| 821 _heap->verify(); | |
| 822 } | |
| 823 } | |
| 824 | |
| 989 | 825 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) { |
| 826 if (PrintCodeCache2) { // Need to add a new flag | |
| 827 ResourceMark rm; | |
| 828 if (size == 0) size = cb->size(); | |
| 829 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size); | |
| 830 } | |
| 831 } | |
| 832 | |
| 0 | 833 void CodeCache::print_internals() { |
| 834 int nmethodCount = 0; | |
| 835 int runtimeStubCount = 0; | |
| 836 int adapterCount = 0; | |
| 837 int deoptimizationStubCount = 0; | |
| 838 int uncommonTrapStubCount = 0; | |
| 839 int bufferBlobCount = 0; | |
| 840 int total = 0; | |
| 841 int nmethodAlive = 0; | |
| 842 int nmethodNotEntrant = 0; | |
| 843 int nmethodZombie = 0; | |
| 844 int nmethodUnloaded = 0; | |
| 845 int nmethodJava = 0; | |
| 846 int nmethodNative = 0; | |
| 847 int maxCodeSize = 0; | |
| 848 ResourceMark rm; | |
| 849 | |
| 850 CodeBlob *cb; | |
| 851 for (cb = first(); cb != NULL; cb = next(cb)) { | |
| 852 total++; | |
| 853 if (cb->is_nmethod()) { | |
| 854 nmethod* nm = (nmethod*)cb; | |
| 855 | |
| 856 if (Verbose && nm->method() != NULL) { | |
| 857 ResourceMark rm; | |
| 858 char *method_name = nm->method()->name_and_sig_as_C_string(); | |
| 859 tty->print("%s", method_name); | |
| 860 if(nm->is_alive()) { tty->print_cr(" alive"); } | |
| 861 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); } | |
| 862 if(nm->is_zombie()) { tty->print_cr(" zombie"); } | |
| 863 } | |
| 864 | |
| 865 nmethodCount++; | |
| 866 | |
| 867 if(nm->is_alive()) { nmethodAlive++; } | |
| 868 if(nm->is_not_entrant()) { nmethodNotEntrant++; } | |
| 869 if(nm->is_zombie()) { nmethodZombie++; } | |
| 870 if(nm->is_unloaded()) { nmethodUnloaded++; } | |
| 871 if(nm->is_native_method()) { nmethodNative++; } | |
| 872 | |
| 873 if(nm->method() != NULL && nm->is_java_method()) { | |
| 874 nmethodJava++; | |
| 1748 | 875 if (nm->insts_size() > maxCodeSize) { |
| 876 maxCodeSize = nm->insts_size(); | |
| 0 | 877 } |
| 878 } | |
| 879 } else if (cb->is_runtime_stub()) { | |
| 880 runtimeStubCount++; | |
| 881 } else if (cb->is_deoptimization_stub()) { | |
| 882 deoptimizationStubCount++; | |
| 883 } else if (cb->is_uncommon_trap_stub()) { | |
| 884 uncommonTrapStubCount++; | |
| 885 } else if (cb->is_adapter_blob()) { | |
| 886 adapterCount++; | |
| 887 } else if (cb->is_buffer_blob()) { | |
| 888 bufferBlobCount++; | |
| 889 } | |
| 890 } | |
| 891 | |
| 892 int bucketSize = 512; | |
| 893 int bucketLimit = maxCodeSize / bucketSize + 1; | |
| 6197 | 894 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode); |
| 0 | 895 memset(buckets,0,sizeof(int) * bucketLimit); |
| 896 | |
| 897 for (cb = first(); cb != NULL; cb = next(cb)) { | |
| 898 if (cb->is_nmethod()) { | |
| 899 nmethod* nm = (nmethod*)cb; | |
| 900 if(nm->is_java_method()) { | |
| 1748 | 901 buckets[nm->insts_size() / bucketSize]++; |
| 0 | 902 } |
| 903 } | |
| 904 } | |
| 905 tty->print_cr("Code Cache Entries (total of %d)",total); | |
| 906 tty->print_cr("-------------------------------------------------"); | |
| 907 tty->print_cr("nmethods: %d",nmethodCount); | |
| 908 tty->print_cr("\talive: %d",nmethodAlive); | |
| 909 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant); | |
| 910 tty->print_cr("\tzombie: %d",nmethodZombie); | |
| 911 tty->print_cr("\tunloaded: %d",nmethodUnloaded); | |
| 912 tty->print_cr("\tjava: %d",nmethodJava); | |
| 913 tty->print_cr("\tnative: %d",nmethodNative); | |
| 914 tty->print_cr("runtime_stubs: %d",runtimeStubCount); | |
| 915 tty->print_cr("adapters: %d",adapterCount); | |
| 916 tty->print_cr("buffer blobs: %d",bufferBlobCount); | |
| 917 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount); | |
| 918 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount); | |
| 919 tty->print_cr("\nnmethod size distribution (non-zombie java)"); | |
| 920 tty->print_cr("-------------------------------------------------"); | |
| 921 | |
| 922 for(int i=0; i<bucketLimit; i++) { | |
| 923 if(buckets[i] != 0) { | |
| 924 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize); | |
| 925 tty->fill_to(40); | |
| 926 tty->print_cr("%d",buckets[i]); | |
| 927 } | |
| 928 } | |
| 929 | |
| 6197 | 930 FREE_C_HEAP_ARRAY(int, buckets, mtCode); |
| 0 | 931 } |
| 932 | |
| 933 void CodeCache::print() { | |
| 934 CodeBlob_sizes live; | |
| 935 CodeBlob_sizes dead; | |
| 936 | |
| 937 FOR_ALL_BLOBS(p) { | |
| 938 if (!p->is_alive()) { | |
| 939 dead.add(p); | |
| 940 } else { | |
| 941 live.add(p); | |
| 942 } | |
| 943 } | |
| 944 | |
| 945 tty->print_cr("CodeCache:"); | |
| 946 | |
| 947 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(), | |
| 948 dependentCheckTime.seconds() / dependentCheckCount); | |
| 949 | |
| 950 if (!live.is_empty()) { | |
| 951 live.print("live"); | |
| 952 } | |
| 953 if (!dead.is_empty()) { | |
| 954 dead.print("dead"); | |
| 955 } | |
| 956 | |
| 957 | |
| 958 if (Verbose) { | |
| 959 // print the oop_map usage | |
| 960 int code_size = 0; | |
| 961 int number_of_blobs = 0; | |
| 962 int number_of_oop_maps = 0; | |
| 963 int map_size = 0; | |
| 964 FOR_ALL_BLOBS(p) { | |
| 965 if (p->is_alive()) { | |
| 966 number_of_blobs++; | |
| 1748 | 967 code_size += p->code_size(); |
| 0 | 968 OopMapSet* set = p->oop_maps(); |
| 969 if (set != NULL) { | |
| 970 number_of_oop_maps += set->size(); | |
| 1748 | 971 map_size += set->heap_size(); |
| 0 | 972 } |
| 973 } | |
| 974 } | |
| 975 tty->print_cr("OopMaps"); | |
| 976 tty->print_cr(" #blobs = %d", number_of_blobs); | |
| 977 tty->print_cr(" code size = %d", code_size); | |
| 978 tty->print_cr(" #oop_maps = %d", number_of_oop_maps); | |
| 979 tty->print_cr(" map size = %d", map_size); | |
| 980 } | |
| 981 | |
| 982 } | |
| 983 | |
| 984 #endif // PRODUCT | |
| 1907 | 985 |
| 986 void CodeCache::print_bounds(outputStream* st) { | |
| 987 st->print_cr("Code Cache [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 988 _heap->low_boundary(), | |
| 989 _heap->high(), | |
| 990 _heap->high_boundary()); | |
| 991 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT | |
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992 " adapters=" UINT32_FORMAT " free_code_cache=" SIZE_FORMAT "Kb" |
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993 " largest_free_block=" SIZE_FORMAT, |
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994 nof_blobs(), nof_nmethods(), nof_adapters(), |
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995 unallocated_capacity()/K, largest_free_block()); |
| 1907 | 996 } |
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997 |
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998 void CodeCache::log_state(outputStream* st) { |
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999 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'" |
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1000 " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'" |
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1001 " largest_free_block='" SIZE_FORMAT "'", |
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1002 nof_blobs(), nof_nmethods(), nof_adapters(), |
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1003 unallocated_capacity(), largest_free_block()); |
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1004 } |
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1005 |
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1006 size_t CodeCache::largest_free_block() { |
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1007 // This is called both with and without CodeCache_lock held so |
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1008 // handle both cases. |
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1009 if (CodeCache_lock->owned_by_self()) { |
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1010 return _heap->largest_free_block(); |
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1011 } else { |
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1012 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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1013 return _heap->largest_free_block(); |
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1014 } |
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1015 } |