Mercurial > hg > truffle
annotate src/share/vm/code/nmethod.cpp @ 931:72088be4b386
6873116: Modify reexecute implementation to use pcDesc to record the reexecute bit
Summary: use PcDesc to keep record of the reexecute bit instead of using DebugInfoStreams
Reviewed-by: kvn, never, twisti
| author | cfang |
|---|---|
| date | Thu, 20 Aug 2009 12:42:57 -0700 |
| parents | 98cb887364d3 |
| children | b1606b3c0a8a 148e5441d916 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
931
72088be4b386
6873116: Modify reexecute implementation to use pcDesc to record the reexecute bit
cfang
parents:
605
diff
changeset
|
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_nmethod.cpp.incl" | |
| 27 | |
| 28 #ifdef DTRACE_ENABLED | |
| 29 | |
| 30 // Only bother with this argument setup if dtrace is available | |
| 31 | |
| 32 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, | |
| 33 const char*, int, const char*, int, const char*, int, void*, size_t); | |
| 34 | |
| 35 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, | |
| 36 char*, int, char*, int, char*, int); | |
| 37 | |
| 38 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ | |
| 39 { \ | |
| 40 methodOop m = (method); \ | |
| 41 if (m != NULL) { \ | |
| 42 symbolOop klass_name = m->klass_name(); \ | |
| 43 symbolOop name = m->name(); \ | |
| 44 symbolOop signature = m->signature(); \ | |
| 45 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ | |
| 46 klass_name->bytes(), klass_name->utf8_length(), \ | |
| 47 name->bytes(), name->utf8_length(), \ | |
| 48 signature->bytes(), signature->utf8_length()); \ | |
| 49 } \ | |
| 50 } | |
| 51 | |
| 52 #else // ndef DTRACE_ENABLED | |
| 53 | |
| 54 #define DTRACE_METHOD_UNLOAD_PROBE(method) | |
| 55 | |
| 56 #endif | |
| 57 | |
| 58 bool nmethod::is_compiled_by_c1() const { | |
| 59 if (is_native_method()) return false; | |
| 60 assert(compiler() != NULL, "must be"); | |
| 61 return compiler()->is_c1(); | |
| 62 } | |
| 63 bool nmethod::is_compiled_by_c2() const { | |
| 64 if (is_native_method()) return false; | |
| 65 assert(compiler() != NULL, "must be"); | |
| 66 return compiler()->is_c2(); | |
| 67 } | |
| 68 | |
| 69 | |
| 70 | |
| 71 //--------------------------------------------------------------------------------- | |
| 72 // NMethod statistics | |
| 73 // They are printed under various flags, including: | |
| 74 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. | |
| 75 // (In the latter two cases, they like other stats are printed to the log only.) | |
| 76 | |
| 77 #ifndef PRODUCT | |
| 78 // These variables are put into one block to reduce relocations | |
| 79 // and make it simpler to print from the debugger. | |
| 80 static | |
| 81 struct nmethod_stats_struct { | |
| 82 int nmethod_count; | |
| 83 int total_size; | |
| 84 int relocation_size; | |
| 85 int code_size; | |
| 86 int stub_size; | |
| 87 int consts_size; | |
| 88 int scopes_data_size; | |
| 89 int scopes_pcs_size; | |
| 90 int dependencies_size; | |
| 91 int handler_table_size; | |
| 92 int nul_chk_table_size; | |
| 93 int oops_size; | |
| 94 | |
| 95 void note_nmethod(nmethod* nm) { | |
| 96 nmethod_count += 1; | |
| 97 total_size += nm->size(); | |
| 98 relocation_size += nm->relocation_size(); | |
| 99 code_size += nm->code_size(); | |
| 100 stub_size += nm->stub_size(); | |
| 101 consts_size += nm->consts_size(); | |
| 102 scopes_data_size += nm->scopes_data_size(); | |
| 103 scopes_pcs_size += nm->scopes_pcs_size(); | |
| 104 dependencies_size += nm->dependencies_size(); | |
| 105 handler_table_size += nm->handler_table_size(); | |
| 106 nul_chk_table_size += nm->nul_chk_table_size(); | |
| 107 oops_size += nm->oops_size(); | |
| 108 } | |
| 109 void print_nmethod_stats() { | |
| 110 if (nmethod_count == 0) return; | |
| 111 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); | |
| 112 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); | |
| 113 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); | |
| 114 if (code_size != 0) tty->print_cr(" main code = %d", code_size); | |
| 115 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); | |
| 116 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); | |
| 117 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); | |
| 118 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); | |
| 119 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); | |
| 120 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); | |
| 121 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); | |
| 122 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); | |
| 123 } | |
| 124 | |
| 125 int native_nmethod_count; | |
| 126 int native_total_size; | |
| 127 int native_relocation_size; | |
| 128 int native_code_size; | |
| 129 int native_oops_size; | |
| 130 void note_native_nmethod(nmethod* nm) { | |
| 131 native_nmethod_count += 1; | |
| 132 native_total_size += nm->size(); | |
| 133 native_relocation_size += nm->relocation_size(); | |
| 134 native_code_size += nm->code_size(); | |
| 135 native_oops_size += nm->oops_size(); | |
| 136 } | |
| 137 void print_native_nmethod_stats() { | |
| 138 if (native_nmethod_count == 0) return; | |
| 139 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); | |
| 140 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); | |
| 141 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); | |
| 142 if (native_code_size != 0) tty->print_cr(" N. main code = %d", native_code_size); | |
| 143 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); | |
| 144 } | |
| 145 | |
| 146 int pc_desc_resets; // number of resets (= number of caches) | |
| 147 int pc_desc_queries; // queries to nmethod::find_pc_desc | |
| 148 int pc_desc_approx; // number of those which have approximate true | |
| 149 int pc_desc_repeats; // number of _last_pc_desc hits | |
| 150 int pc_desc_hits; // number of LRU cache hits | |
| 151 int pc_desc_tests; // total number of PcDesc examinations | |
| 152 int pc_desc_searches; // total number of quasi-binary search steps | |
| 153 int pc_desc_adds; // number of LUR cache insertions | |
| 154 | |
| 155 void print_pc_stats() { | |
| 156 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", | |
| 157 pc_desc_queries, | |
| 158 (double)(pc_desc_tests + pc_desc_searches) | |
| 159 / pc_desc_queries); | |
| 160 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", | |
| 161 pc_desc_resets, | |
| 162 pc_desc_queries, pc_desc_approx, | |
| 163 pc_desc_repeats, pc_desc_hits, | |
| 164 pc_desc_tests, pc_desc_searches, pc_desc_adds); | |
| 165 } | |
| 166 } nmethod_stats; | |
| 167 #endif //PRODUCT | |
| 168 | |
| 169 //--------------------------------------------------------------------------------- | |
| 170 | |
| 171 | |
| 172 // The _unwind_handler is a special marker address, which says that | |
| 173 // for given exception oop and address, the frame should be removed | |
| 174 // as the tuple cannot be caught in the nmethod | |
| 175 address ExceptionCache::_unwind_handler = (address) -1; | |
| 176 | |
| 177 | |
| 178 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { | |
| 179 assert(pc != NULL, "Must be non null"); | |
| 180 assert(exception.not_null(), "Must be non null"); | |
| 181 assert(handler != NULL, "Must be non null"); | |
| 182 | |
| 183 _count = 0; | |
| 184 _exception_type = exception->klass(); | |
| 185 _next = NULL; | |
| 186 | |
| 187 add_address_and_handler(pc,handler); | |
| 188 } | |
| 189 | |
| 190 | |
| 191 address ExceptionCache::match(Handle exception, address pc) { | |
| 192 assert(pc != NULL,"Must be non null"); | |
| 193 assert(exception.not_null(),"Must be non null"); | |
| 194 if (exception->klass() == exception_type()) { | |
| 195 return (test_address(pc)); | |
| 196 } | |
| 197 | |
| 198 return NULL; | |
| 199 } | |
| 200 | |
| 201 | |
| 202 bool ExceptionCache::match_exception_with_space(Handle exception) { | |
| 203 assert(exception.not_null(),"Must be non null"); | |
| 204 if (exception->klass() == exception_type() && count() < cache_size) { | |
| 205 return true; | |
| 206 } | |
| 207 return false; | |
| 208 } | |
| 209 | |
| 210 | |
| 211 address ExceptionCache::test_address(address addr) { | |
| 212 for (int i=0; i<count(); i++) { | |
| 213 if (pc_at(i) == addr) { | |
| 214 return handler_at(i); | |
| 215 } | |
| 216 } | |
| 217 return NULL; | |
| 218 } | |
| 219 | |
| 220 | |
| 221 bool ExceptionCache::add_address_and_handler(address addr, address handler) { | |
| 222 if (test_address(addr) == handler) return true; | |
| 223 if (count() < cache_size) { | |
| 224 set_pc_at(count(),addr); | |
| 225 set_handler_at(count(), handler); | |
| 226 increment_count(); | |
| 227 return true; | |
| 228 } | |
| 229 return false; | |
| 230 } | |
| 231 | |
| 232 | |
| 233 // private method for handling exception cache | |
| 234 // These methods are private, and used to manipulate the exception cache | |
| 235 // directly. | |
| 236 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { | |
| 237 ExceptionCache* ec = exception_cache(); | |
| 238 while (ec != NULL) { | |
| 239 if (ec->match_exception_with_space(exception)) { | |
| 240 return ec; | |
| 241 } | |
| 242 ec = ec->next(); | |
| 243 } | |
| 244 return NULL; | |
| 245 } | |
| 246 | |
| 247 | |
| 248 //----------------------------------------------------------------------------- | |
| 249 | |
| 250 | |
| 251 // Helper used by both find_pc_desc methods. | |
| 252 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { | |
| 253 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); | |
| 254 if (!approximate) | |
| 255 return pc->pc_offset() == pc_offset; | |
| 256 else | |
| 257 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); | |
| 258 } | |
| 259 | |
| 260 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { | |
| 261 if (initial_pc_desc == NULL) { | |
| 262 _last_pc_desc = NULL; // native method | |
| 263 return; | |
| 264 } | |
| 265 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); | |
| 266 // reset the cache by filling it with benign (non-null) values | |
| 267 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); | |
| 268 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel | |
| 269 for (int i = 0; i < cache_size; i++) | |
| 270 _pc_descs[i] = initial_pc_desc; | |
| 271 } | |
| 272 | |
| 273 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { | |
| 274 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); | |
| 275 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); | |
| 276 | |
| 277 // In order to prevent race conditions do not load cache elements | |
| 278 // repeatedly, but use a local copy: | |
| 279 PcDesc* res; | |
| 280 | |
| 281 // Step one: Check the most recently returned value. | |
| 282 res = _last_pc_desc; | |
| 283 if (res == NULL) return NULL; // native method; no PcDescs at all | |
| 284 if (match_desc(res, pc_offset, approximate)) { | |
| 285 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); | |
| 286 return res; | |
| 287 } | |
| 288 | |
| 289 // Step two: Check the LRU cache. | |
| 290 for (int i = 0; i < cache_size; i++) { | |
| 291 res = _pc_descs[i]; | |
| 292 if (res->pc_offset() < 0) break; // optimization: skip empty cache | |
| 293 if (match_desc(res, pc_offset, approximate)) { | |
| 294 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); | |
| 295 _last_pc_desc = res; // record this cache hit in case of repeat | |
| 296 return res; | |
| 297 } | |
| 298 } | |
| 299 | |
| 300 // Report failure. | |
| 301 return NULL; | |
| 302 } | |
| 303 | |
| 304 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { | |
| 305 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); | |
| 306 // Update the LRU cache by shifting pc_desc forward: | |
| 307 for (int i = 0; i < cache_size; i++) { | |
| 308 PcDesc* next = _pc_descs[i]; | |
| 309 _pc_descs[i] = pc_desc; | |
| 310 pc_desc = next; | |
| 311 } | |
| 312 // Note: Do not update _last_pc_desc. It fronts for the LRU cache. | |
| 313 } | |
| 314 | |
| 315 // adjust pcs_size so that it is a multiple of both oopSize and | |
| 316 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple | |
| 317 // of oopSize, then 2*sizeof(PcDesc) is) | |
| 318 static int adjust_pcs_size(int pcs_size) { | |
| 319 int nsize = round_to(pcs_size, oopSize); | |
| 320 if ((nsize % sizeof(PcDesc)) != 0) { | |
| 321 nsize = pcs_size + sizeof(PcDesc); | |
| 322 } | |
| 323 assert((nsize % oopSize) == 0, "correct alignment"); | |
| 324 return nsize; | |
| 325 } | |
| 326 | |
| 327 //----------------------------------------------------------------------------- | |
| 328 | |
| 329 | |
| 330 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { | |
| 331 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); | |
| 332 assert(new_entry != NULL,"Must be non null"); | |
| 333 assert(new_entry->next() == NULL, "Must be null"); | |
| 334 | |
| 335 if (exception_cache() != NULL) { | |
| 336 new_entry->set_next(exception_cache()); | |
| 337 } | |
| 338 set_exception_cache(new_entry); | |
| 339 } | |
| 340 | |
| 341 void nmethod::remove_from_exception_cache(ExceptionCache* ec) { | |
| 342 ExceptionCache* prev = NULL; | |
| 343 ExceptionCache* curr = exception_cache(); | |
| 344 assert(curr != NULL, "nothing to remove"); | |
| 345 // find the previous and next entry of ec | |
| 346 while (curr != ec) { | |
| 347 prev = curr; | |
| 348 curr = curr->next(); | |
| 349 assert(curr != NULL, "ExceptionCache not found"); | |
| 350 } | |
| 351 // now: curr == ec | |
| 352 ExceptionCache* next = curr->next(); | |
| 353 if (prev == NULL) { | |
| 354 set_exception_cache(next); | |
| 355 } else { | |
| 356 prev->set_next(next); | |
| 357 } | |
| 358 delete curr; | |
| 359 } | |
| 360 | |
| 361 | |
| 362 // public method for accessing the exception cache | |
| 363 // These are the public access methods. | |
| 364 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { | |
| 365 // We never grab a lock to read the exception cache, so we may | |
| 366 // have false negatives. This is okay, as it can only happen during | |
| 367 // the first few exception lookups for a given nmethod. | |
| 368 ExceptionCache* ec = exception_cache(); | |
| 369 while (ec != NULL) { | |
| 370 address ret_val; | |
| 371 if ((ret_val = ec->match(exception,pc)) != NULL) { | |
| 372 return ret_val; | |
| 373 } | |
| 374 ec = ec->next(); | |
| 375 } | |
| 376 return NULL; | |
| 377 } | |
| 378 | |
| 379 | |
| 380 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { | |
| 381 // There are potential race conditions during exception cache updates, so we | |
| 382 // must own the ExceptionCache_lock before doing ANY modifications. Because | |
| 605 | 383 // we don't lock during reads, it is possible to have several threads attempt |
| 0 | 384 // to update the cache with the same data. We need to check for already inserted |
| 385 // copies of the current data before adding it. | |
| 386 | |
| 387 MutexLocker ml(ExceptionCache_lock); | |
| 388 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); | |
| 389 | |
| 390 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { | |
| 391 target_entry = new ExceptionCache(exception,pc,handler); | |
| 392 add_exception_cache_entry(target_entry); | |
| 393 } | |
| 394 } | |
| 395 | |
| 396 | |
| 397 //-------------end of code for ExceptionCache-------------- | |
| 398 | |
| 399 | |
| 400 void nmFlags::clear() { | |
| 401 assert(sizeof(nmFlags) == sizeof(int), "using more than one word for nmFlags"); | |
| 402 *(jint*)this = 0; | |
| 403 } | |
| 404 | |
| 405 int nmethod::total_size() const { | |
| 406 return | |
| 407 code_size() + | |
| 408 stub_size() + | |
| 409 consts_size() + | |
| 410 scopes_data_size() + | |
| 411 scopes_pcs_size() + | |
| 412 handler_table_size() + | |
| 413 nul_chk_table_size(); | |
| 414 } | |
| 415 | |
| 416 const char* nmethod::compile_kind() const { | |
| 417 if (method() == NULL) return "unloaded"; | |
| 418 if (is_native_method()) return "c2n"; | |
| 419 if (is_osr_method()) return "osr"; | |
| 420 return NULL; | |
| 421 } | |
| 422 | |
| 423 // %%% This variable is no longer used? | |
| 424 int nmethod::_zombie_instruction_size = NativeJump::instruction_size; | |
| 425 | |
| 426 | |
| 427 nmethod* nmethod::new_native_nmethod(methodHandle method, | |
| 428 CodeBuffer *code_buffer, | |
| 429 int vep_offset, | |
| 430 int frame_complete, | |
| 431 int frame_size, | |
| 432 ByteSize basic_lock_owner_sp_offset, | |
| 433 ByteSize basic_lock_sp_offset, | |
| 434 OopMapSet* oop_maps) { | |
| 435 // create nmethod | |
| 436 nmethod* nm = NULL; | |
| 437 { | |
| 438 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 439 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); | |
| 440 CodeOffsets offsets; | |
| 441 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); | |
| 442 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); | |
| 443 nm = new (native_nmethod_size) | |
| 444 nmethod(method(), native_nmethod_size, &offsets, | |
| 445 code_buffer, frame_size, | |
| 446 basic_lock_owner_sp_offset, basic_lock_sp_offset, | |
| 447 oop_maps); | |
| 448 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); | |
| 449 if (PrintAssembly && nm != NULL) | |
| 450 Disassembler::decode(nm); | |
| 451 } | |
| 452 // verify nmethod | |
| 453 debug_only(if (nm) nm->verify();) // might block | |
| 454 | |
| 455 if (nm != NULL) { | |
| 456 nm->log_new_nmethod(); | |
| 457 } | |
| 458 | |
| 459 return nm; | |
| 460 } | |
| 461 | |
|
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462 #ifdef HAVE_DTRACE_H |
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463 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, |
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464 CodeBuffer *code_buffer, |
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465 int vep_offset, |
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466 int trap_offset, |
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467 int frame_complete, |
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468 int frame_size) { |
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469 // create nmethod |
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470 nmethod* nm = NULL; |
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471 { |
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472 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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473 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); |
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474 CodeOffsets offsets; |
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475 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); |
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476 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); |
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477 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); |
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478 |
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479 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size); |
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480 |
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481 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); |
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482 if (PrintAssembly && nm != NULL) |
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483 Disassembler::decode(nm); |
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484 } |
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485 // verify nmethod |
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486 debug_only(if (nm) nm->verify();) // might block |
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487 |
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488 if (nm != NULL) { |
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489 nm->log_new_nmethod(); |
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490 } |
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491 |
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492 return nm; |
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493 } |
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494 |
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495 #endif // def HAVE_DTRACE_H |
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496 |
| 0 | 497 nmethod* nmethod::new_nmethod(methodHandle method, |
| 498 int compile_id, | |
| 499 int entry_bci, | |
| 500 CodeOffsets* offsets, | |
| 501 int orig_pc_offset, | |
| 502 DebugInformationRecorder* debug_info, | |
| 503 Dependencies* dependencies, | |
| 504 CodeBuffer* code_buffer, int frame_size, | |
| 505 OopMapSet* oop_maps, | |
| 506 ExceptionHandlerTable* handler_table, | |
| 507 ImplicitExceptionTable* nul_chk_table, | |
| 508 AbstractCompiler* compiler, | |
| 509 int comp_level | |
| 510 ) | |
| 511 { | |
| 512 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); | |
| 513 // create nmethod | |
| 514 nmethod* nm = NULL; | |
| 515 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 516 int nmethod_size = | |
| 517 allocation_size(code_buffer, sizeof(nmethod)) | |
| 518 + adjust_pcs_size(debug_info->pcs_size()) | |
| 519 + round_to(dependencies->size_in_bytes() , oopSize) | |
| 520 + round_to(handler_table->size_in_bytes(), oopSize) | |
| 521 + round_to(nul_chk_table->size_in_bytes(), oopSize) | |
| 522 + round_to(debug_info->data_size() , oopSize); | |
| 523 nm = new (nmethod_size) | |
| 524 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, | |
| 525 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, | |
| 526 oop_maps, | |
| 527 handler_table, | |
| 528 nul_chk_table, | |
| 529 compiler, | |
| 530 comp_level); | |
| 531 if (nm != NULL) { | |
| 532 // To make dependency checking during class loading fast, record | |
| 533 // the nmethod dependencies in the classes it is dependent on. | |
| 534 // This allows the dependency checking code to simply walk the | |
| 535 // class hierarchy above the loaded class, checking only nmethods | |
| 536 // which are dependent on those classes. The slow way is to | |
| 537 // check every nmethod for dependencies which makes it linear in | |
| 538 // the number of methods compiled. For applications with a lot | |
| 539 // classes the slow way is too slow. | |
| 540 for (Dependencies::DepStream deps(nm); deps.next(); ) { | |
| 541 klassOop klass = deps.context_type(); | |
| 542 if (klass == NULL) continue; // ignore things like evol_method | |
| 543 | |
| 544 // record this nmethod as dependent on this klass | |
| 545 instanceKlass::cast(klass)->add_dependent_nmethod(nm); | |
| 546 } | |
| 547 } | |
| 548 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); | |
| 549 if (PrintAssembly && nm != NULL) | |
| 550 Disassembler::decode(nm); | |
| 551 } | |
| 552 | |
| 553 // verify nmethod | |
| 554 debug_only(if (nm) nm->verify();) // might block | |
| 555 | |
| 556 if (nm != NULL) { | |
| 557 nm->log_new_nmethod(); | |
| 558 } | |
| 559 | |
| 560 // done | |
| 561 return nm; | |
| 562 } | |
| 563 | |
| 564 | |
| 565 // For native wrappers | |
| 566 nmethod::nmethod( | |
| 567 methodOop method, | |
| 568 int nmethod_size, | |
| 569 CodeOffsets* offsets, | |
| 570 CodeBuffer* code_buffer, | |
| 571 int frame_size, | |
| 572 ByteSize basic_lock_owner_sp_offset, | |
| 573 ByteSize basic_lock_sp_offset, | |
| 574 OopMapSet* oop_maps ) | |
| 575 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), | |
| 576 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), | |
| 577 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset), | |
| 578 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset) | |
| 579 { | |
| 580 { | |
| 581 debug_only(No_Safepoint_Verifier nsv;) | |
| 582 assert_locked_or_safepoint(CodeCache_lock); | |
| 583 | |
| 584 NOT_PRODUCT(_has_debug_info = false; ) | |
| 585 _method = method; | |
| 586 _entry_bci = InvocationEntryBci; | |
| 587 _link = NULL; | |
| 588 _compiler = NULL; | |
| 589 // We have no exception handler or deopt handler make the | |
| 590 // values something that will never match a pc like the nmethod vtable entry | |
| 591 _exception_offset = 0; | |
| 592 _deoptimize_offset = 0; | |
| 593 _orig_pc_offset = 0; | |
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594 #ifdef HAVE_DTRACE_H |
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595 _trap_offset = 0; |
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596 #endif // def HAVE_DTRACE_H |
| 0 | 597 _stub_offset = data_offset(); |
| 598 _consts_offset = data_offset(); | |
| 599 _scopes_data_offset = data_offset(); | |
| 600 _scopes_pcs_offset = _scopes_data_offset; | |
| 601 _dependencies_offset = _scopes_pcs_offset; | |
| 602 _handler_table_offset = _dependencies_offset; | |
| 603 _nul_chk_table_offset = _handler_table_offset; | |
| 604 _nmethod_end_offset = _nul_chk_table_offset; | |
| 605 _compile_id = 0; // default | |
| 606 _comp_level = CompLevel_none; | |
| 607 _entry_point = instructions_begin(); | |
| 608 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); | |
| 609 _osr_entry_point = NULL; | |
| 610 _exception_cache = NULL; | |
| 611 _pc_desc_cache.reset_to(NULL); | |
| 612 | |
| 613 flags.clear(); | |
| 614 flags.state = alive; | |
| 615 _markedForDeoptimization = 0; | |
| 616 | |
| 617 _lock_count = 0; | |
| 618 _stack_traversal_mark = 0; | |
| 619 | |
| 620 code_buffer->copy_oops_to(this); | |
| 621 debug_only(check_store();) | |
| 622 CodeCache::commit(this); | |
| 623 VTune::create_nmethod(this); | |
| 624 } | |
| 625 | |
| 626 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { | |
| 627 ttyLocker ttyl; // keep the following output all in one block | |
| 628 // This output goes directly to the tty, not the compiler log. | |
| 629 // To enable tools to match it up with the compilation activity, | |
| 630 // be sure to tag this tty output with the compile ID. | |
| 631 if (xtty != NULL) { | |
| 632 xtty->begin_head("print_native_nmethod"); | |
| 633 xtty->method(_method); | |
| 634 xtty->stamp(); | |
| 635 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); | |
| 636 } | |
| 637 // print the header part first | |
| 638 print(); | |
| 639 // then print the requested information | |
| 640 if (PrintNativeNMethods) { | |
| 641 print_code(); | |
| 642 oop_maps->print(); | |
| 643 } | |
| 644 if (PrintRelocations) { | |
| 645 print_relocations(); | |
| 646 } | |
| 647 if (xtty != NULL) { | |
| 648 xtty->tail("print_native_nmethod"); | |
| 649 } | |
| 650 } | |
| 651 Events::log("Create nmethod " INTPTR_FORMAT, this); | |
| 652 } | |
| 653 | |
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654 // For dtrace wrappers |
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655 #ifdef HAVE_DTRACE_H |
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656 nmethod::nmethod( |
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657 methodOop method, |
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658 int nmethod_size, |
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659 CodeOffsets* offsets, |
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660 CodeBuffer* code_buffer, |
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661 int frame_size) |
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662 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), |
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663 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), |
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664 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)), |
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665 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1)) |
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666 { |
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667 { |
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668 debug_only(No_Safepoint_Verifier nsv;) |
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669 assert_locked_or_safepoint(CodeCache_lock); |
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670 |
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671 NOT_PRODUCT(_has_debug_info = false; ) |
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672 _method = method; |
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673 _entry_bci = InvocationEntryBci; |
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674 _link = NULL; |
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675 _compiler = NULL; |
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676 // We have no exception handler or deopt handler make the |
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677 // values something that will never match a pc like the nmethod vtable entry |
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678 _exception_offset = 0; |
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679 _deoptimize_offset = 0; |
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680 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); |
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681 _orig_pc_offset = 0; |
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682 _stub_offset = data_offset(); |
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683 _consts_offset = data_offset(); |
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684 _scopes_data_offset = data_offset(); |
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685 _scopes_pcs_offset = _scopes_data_offset; |
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686 _dependencies_offset = _scopes_pcs_offset; |
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687 _handler_table_offset = _dependencies_offset; |
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688 _nul_chk_table_offset = _handler_table_offset; |
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689 _nmethod_end_offset = _nul_chk_table_offset; |
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690 _compile_id = 0; // default |
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691 _comp_level = CompLevel_none; |
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692 _entry_point = instructions_begin(); |
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693 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); |
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694 _osr_entry_point = NULL; |
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695 _exception_cache = NULL; |
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696 _pc_desc_cache.reset_to(NULL); |
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697 |
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698 flags.clear(); |
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699 flags.state = alive; |
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700 _markedForDeoptimization = 0; |
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701 |
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702 _lock_count = 0; |
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703 _stack_traversal_mark = 0; |
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704 |
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705 code_buffer->copy_oops_to(this); |
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706 debug_only(check_store();) |
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707 CodeCache::commit(this); |
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708 VTune::create_nmethod(this); |
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709 } |
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710 |
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711 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { |
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712 ttyLocker ttyl; // keep the following output all in one block |
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713 // This output goes directly to the tty, not the compiler log. |
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714 // To enable tools to match it up with the compilation activity, |
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715 // be sure to tag this tty output with the compile ID. |
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716 if (xtty != NULL) { |
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717 xtty->begin_head("print_dtrace_nmethod"); |
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718 xtty->method(_method); |
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719 xtty->stamp(); |
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720 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); |
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721 } |
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722 // print the header part first |
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723 print(); |
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724 // then print the requested information |
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725 if (PrintNMethods) { |
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726 print_code(); |
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727 } |
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728 if (PrintRelocations) { |
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729 print_relocations(); |
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730 } |
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731 if (xtty != NULL) { |
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732 xtty->tail("print_dtrace_nmethod"); |
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733 } |
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734 } |
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735 Events::log("Create nmethod " INTPTR_FORMAT, this); |
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736 } |
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737 #endif // def HAVE_DTRACE_H |
| 0 | 738 |
| 739 void* nmethod::operator new(size_t size, int nmethod_size) { | |
| 740 // Always leave some room in the CodeCache for I2C/C2I adapters | |
| 741 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL; | |
| 742 return CodeCache::allocate(nmethod_size); | |
| 743 } | |
| 744 | |
| 745 | |
| 746 nmethod::nmethod( | |
| 747 methodOop method, | |
| 748 int nmethod_size, | |
| 749 int compile_id, | |
| 750 int entry_bci, | |
| 751 CodeOffsets* offsets, | |
| 752 int orig_pc_offset, | |
| 753 DebugInformationRecorder* debug_info, | |
| 754 Dependencies* dependencies, | |
| 755 CodeBuffer *code_buffer, | |
| 756 int frame_size, | |
| 757 OopMapSet* oop_maps, | |
| 758 ExceptionHandlerTable* handler_table, | |
| 759 ImplicitExceptionTable* nul_chk_table, | |
| 760 AbstractCompiler* compiler, | |
| 761 int comp_level | |
| 762 ) | |
| 763 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), | |
| 764 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), | |
| 765 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)), | |
| 766 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1)) | |
| 767 { | |
| 768 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); | |
| 769 { | |
| 770 debug_only(No_Safepoint_Verifier nsv;) | |
| 771 assert_locked_or_safepoint(CodeCache_lock); | |
| 772 | |
| 773 NOT_PRODUCT(_has_debug_info = false; ) | |
| 774 _method = method; | |
| 775 _compile_id = compile_id; | |
| 776 _comp_level = comp_level; | |
| 777 _entry_bci = entry_bci; | |
| 778 _link = NULL; | |
| 779 _compiler = compiler; | |
| 780 _orig_pc_offset = orig_pc_offset; | |
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781 #ifdef HAVE_DTRACE_H |
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782 _trap_offset = 0; |
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783 #endif // def HAVE_DTRACE_H |
| 0 | 784 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start()); |
| 785 | |
| 786 // Exception handler and deopt handler are in the stub section | |
| 787 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); | |
| 788 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); | |
| 789 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start()); | |
| 790 _scopes_data_offset = data_offset(); | |
| 791 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); | |
| 792 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); | |
| 793 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); | |
| 794 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); | |
| 795 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); | |
| 796 | |
| 797 _entry_point = instructions_begin(); | |
| 798 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); | |
| 799 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry); | |
| 800 _exception_cache = NULL; | |
| 801 _pc_desc_cache.reset_to(scopes_pcs_begin()); | |
| 802 | |
| 803 flags.clear(); | |
| 804 flags.state = alive; | |
| 805 _markedForDeoptimization = 0; | |
| 806 | |
| 807 _unload_reported = false; // jvmti state | |
| 808 | |
| 809 _lock_count = 0; | |
| 810 _stack_traversal_mark = 0; | |
| 811 | |
| 812 // Copy contents of ScopeDescRecorder to nmethod | |
| 813 code_buffer->copy_oops_to(this); | |
| 814 debug_info->copy_to(this); | |
| 815 dependencies->copy_to(this); | |
| 816 debug_only(check_store();) | |
| 817 | |
| 818 CodeCache::commit(this); | |
| 819 | |
| 820 VTune::create_nmethod(this); | |
| 821 | |
| 822 // Copy contents of ExceptionHandlerTable to nmethod | |
| 823 handler_table->copy_to(this); | |
| 824 nul_chk_table->copy_to(this); | |
| 825 | |
| 826 // we use the information of entry points to find out if a method is | |
| 827 // static or non static | |
| 828 assert(compiler->is_c2() || | |
| 829 _method->is_static() == (entry_point() == _verified_entry_point), | |
| 830 " entry points must be same for static methods and vice versa"); | |
| 831 } | |
| 832 | |
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833 bool printnmethods = PrintNMethods |
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834 || CompilerOracle::should_print(_method) |
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835 || CompilerOracle::has_option_string(_method, "PrintNMethods"); |
| 0 | 836 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { |
| 837 print_nmethod(printnmethods); | |
| 838 } | |
| 839 | |
| 840 // Note: Do not verify in here as the CodeCache_lock is | |
| 841 // taken which would conflict with the CompiledIC_lock | |
| 842 // which taken during the verification of call sites. | |
| 843 // (was bug - gri 10/25/99) | |
| 844 | |
| 845 Events::log("Create nmethod " INTPTR_FORMAT, this); | |
| 846 } | |
| 847 | |
| 848 | |
| 849 // Print a short set of xml attributes to identify this nmethod. The | |
| 850 // output should be embedded in some other element. | |
| 851 void nmethod::log_identity(xmlStream* log) const { | |
| 852 log->print(" compile_id='%d'", compile_id()); | |
| 853 const char* nm_kind = compile_kind(); | |
| 854 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); | |
| 855 if (compiler() != NULL) { | |
| 856 log->print(" compiler='%s'", compiler()->name()); | |
| 857 } | |
| 858 #ifdef TIERED | |
| 859 log->print(" level='%d'", comp_level()); | |
| 860 #endif // TIERED | |
| 861 } | |
| 862 | |
| 863 | |
| 864 #define LOG_OFFSET(log, name) \ | |
| 865 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ | |
| 866 log->print(" " XSTR(name) "_offset='%d'" , \ | |
| 867 (intptr_t)name##_begin() - (intptr_t)this) | |
| 868 | |
| 869 | |
| 870 void nmethod::log_new_nmethod() const { | |
| 871 if (LogCompilation && xtty != NULL) { | |
| 872 ttyLocker ttyl; | |
| 873 HandleMark hm; | |
| 874 xtty->begin_elem("nmethod"); | |
| 875 log_identity(xtty); | |
| 876 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", | |
| 877 instructions_begin(), size()); | |
| 878 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); | |
| 879 | |
| 880 LOG_OFFSET(xtty, relocation); | |
| 881 LOG_OFFSET(xtty, code); | |
| 882 LOG_OFFSET(xtty, stub); | |
| 883 LOG_OFFSET(xtty, consts); | |
| 884 LOG_OFFSET(xtty, scopes_data); | |
| 885 LOG_OFFSET(xtty, scopes_pcs); | |
| 886 LOG_OFFSET(xtty, dependencies); | |
| 887 LOG_OFFSET(xtty, handler_table); | |
| 888 LOG_OFFSET(xtty, nul_chk_table); | |
| 889 LOG_OFFSET(xtty, oops); | |
| 890 | |
| 891 xtty->method(method()); | |
| 892 xtty->stamp(); | |
| 893 xtty->end_elem(); | |
| 894 } | |
| 895 } | |
| 896 | |
| 897 #undef LOG_OFFSET | |
| 898 | |
| 899 | |
| 900 // Print out more verbose output usually for a newly created nmethod. | |
| 901 void nmethod::print_on(outputStream* st, const char* title) const { | |
| 902 if (st != NULL) { | |
| 903 ttyLocker ttyl; | |
| 904 // Print a little tag line that looks like +PrintCompilation output: | |
| 905 st->print("%3d%c %s", | |
| 906 compile_id(), | |
| 907 is_osr_method() ? '%' : | |
| 908 method() != NULL && | |
| 909 is_native_method() ? 'n' : ' ', | |
| 910 title); | |
| 911 #ifdef TIERED | |
| 912 st->print(" (%d) ", comp_level()); | |
| 913 #endif // TIERED | |
| 914 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this); | |
| 915 if (method() != NULL) { | |
| 916 method()->print_short_name(st); | |
| 917 if (is_osr_method()) | |
| 918 st->print(" @ %d", osr_entry_bci()); | |
| 919 if (method()->code_size() > 0) | |
| 920 st->print(" (%d bytes)", method()->code_size()); | |
| 921 } | |
| 922 } | |
| 923 } | |
| 924 | |
| 925 | |
| 926 void nmethod::print_nmethod(bool printmethod) { | |
| 927 ttyLocker ttyl; // keep the following output all in one block | |
| 928 if (xtty != NULL) { | |
| 929 xtty->begin_head("print_nmethod"); | |
| 930 xtty->stamp(); | |
| 931 xtty->end_head(); | |
| 932 } | |
| 933 // print the header part first | |
| 934 print(); | |
| 935 // then print the requested information | |
| 936 if (printmethod) { | |
| 937 print_code(); | |
| 938 print_pcs(); | |
| 939 oop_maps()->print(); | |
| 940 } | |
| 941 if (PrintDebugInfo) { | |
| 942 print_scopes(); | |
| 943 } | |
| 944 if (PrintRelocations) { | |
| 945 print_relocations(); | |
| 946 } | |
| 947 if (PrintDependencies) { | |
| 948 print_dependencies(); | |
| 949 } | |
| 950 if (PrintExceptionHandlers) { | |
| 951 print_handler_table(); | |
| 952 print_nul_chk_table(); | |
| 953 } | |
| 954 if (xtty != NULL) { | |
| 955 xtty->tail("print_nmethod"); | |
| 956 } | |
| 957 } | |
| 958 | |
| 959 | |
| 960 void nmethod::set_version(int v) { | |
| 961 flags.version = v; | |
| 962 } | |
| 963 | |
| 964 | |
| 965 ScopeDesc* nmethod::scope_desc_at(address pc) { | |
| 966 PcDesc* pd = pc_desc_at(pc); | |
| 967 guarantee(pd != NULL, "scope must be present"); | |
| 968 return new ScopeDesc(this, pd->scope_decode_offset(), | |
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969 pd->obj_decode_offset(), pd->should_reexecute()); |
| 0 | 970 } |
| 971 | |
| 972 | |
| 973 void nmethod::clear_inline_caches() { | |
| 974 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); | |
| 975 if (is_zombie()) { | |
| 976 return; | |
| 977 } | |
| 978 | |
| 979 RelocIterator iter(this); | |
| 980 while (iter.next()) { | |
| 981 iter.reloc()->clear_inline_cache(); | |
| 982 } | |
| 983 } | |
| 984 | |
| 985 | |
| 986 void nmethod::cleanup_inline_caches() { | |
| 987 | |
| 988 assert(SafepointSynchronize::is_at_safepoint() && | |
| 989 !CompiledIC_lock->is_locked() && | |
| 990 !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs"); | |
| 991 | |
| 992 // If the method is not entrant or zombie then a JMP is plastered over the | |
| 993 // first few bytes. If an oop in the old code was there, that oop | |
| 994 // should not get GC'd. Skip the first few bytes of oops on | |
| 995 // not-entrant methods. | |
| 996 address low_boundary = verified_entry_point(); | |
| 997 if (!is_in_use()) { | |
| 998 low_boundary += NativeJump::instruction_size; | |
| 999 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. | |
| 1000 // This means that the low_boundary is going to be a little too high. | |
| 1001 // This shouldn't matter, since oops of non-entrant methods are never used. | |
| 1002 // In fact, why are we bothering to look at oops in a non-entrant method?? | |
| 1003 } | |
| 1004 | |
| 1005 // Find all calls in an nmethod, and clear the ones that points to zombie methods | |
| 1006 ResourceMark rm; | |
| 1007 RelocIterator iter(this, low_boundary); | |
| 1008 while(iter.next()) { | |
| 1009 switch(iter.type()) { | |
| 1010 case relocInfo::virtual_call_type: | |
| 1011 case relocInfo::opt_virtual_call_type: { | |
| 1012 CompiledIC *ic = CompiledIC_at(iter.reloc()); | |
| 1013 // Ok, to lookup references to zombies here | |
| 1014 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); | |
| 1015 if( cb != NULL && cb->is_nmethod() ) { | |
| 1016 nmethod* nm = (nmethod*)cb; | |
| 1017 // Clean inline caches pointing to both zombie and not_entrant methods | |
| 1018 if (!nm->is_in_use()) ic->set_to_clean(); | |
| 1019 } | |
| 1020 break; | |
| 1021 } | |
| 1022 case relocInfo::static_call_type: { | |
| 1023 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); | |
| 1024 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); | |
| 1025 if( cb != NULL && cb->is_nmethod() ) { | |
| 1026 nmethod* nm = (nmethod*)cb; | |
| 1027 // Clean inline caches pointing to both zombie and not_entrant methods | |
| 1028 if (!nm->is_in_use()) csc->set_to_clean(); | |
| 1029 } | |
| 1030 break; | |
| 1031 } | |
| 1032 } | |
| 1033 } | |
| 1034 } | |
| 1035 | |
| 1036 void nmethod::mark_as_seen_on_stack() { | |
| 1037 assert(is_not_entrant(), "must be a non-entrant method"); | |
| 1038 set_stack_traversal_mark(NMethodSweeper::traversal_count()); | |
| 1039 } | |
| 1040 | |
| 1041 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack) | |
| 1042 bool nmethod::can_not_entrant_be_converted() { | |
| 1043 assert(is_not_entrant(), "must be a non-entrant method"); | |
| 1044 assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint"); | |
| 1045 | |
| 1046 // Since the nmethod sweeper only does partial sweep the sweeper's traversal | |
| 1047 // count can be greater than the stack traversal count before it hits the | |
| 1048 // nmethod for the second time. | |
| 1049 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count(); | |
| 1050 } | |
| 1051 | |
| 1052 void nmethod::inc_decompile_count() { | |
| 1053 // Could be gated by ProfileTraps, but do not bother... | |
| 1054 methodOop m = method(); | |
| 1055 if (m == NULL) return; | |
| 1056 methodDataOop mdo = m->method_data(); | |
| 1057 if (mdo == NULL) return; | |
| 1058 // There is a benign race here. See comments in methodDataOop.hpp. | |
| 1059 mdo->inc_decompile_count(); | |
| 1060 } | |
| 1061 | |
| 1062 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { | |
| 1063 | |
| 1064 post_compiled_method_unload(); | |
| 1065 | |
| 1066 // Since this nmethod is being unloaded, make sure that dependencies | |
| 1067 // recorded in instanceKlasses get flushed and pass non-NULL closure to | |
| 1068 // indicate that this work is being done during a GC. | |
| 1069 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); | |
| 1070 assert(is_alive != NULL, "Should be non-NULL"); | |
| 1071 // A non-NULL is_alive closure indicates that this is being called during GC. | |
| 1072 flush_dependencies(is_alive); | |
| 1073 | |
| 1074 // Break cycle between nmethod & method | |
| 1075 if (TraceClassUnloading && WizardMode) { | |
| 1076 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT | |
| 1077 " unloadable], methodOop(" INTPTR_FORMAT | |
| 1078 "), cause(" INTPTR_FORMAT ")", | |
| 1079 this, (address)_method, (address)cause); | |
| 1080 cause->klass()->print(); | |
| 1081 } | |
| 1082 // If _method is already NULL the methodOop is about to be unloaded, | |
| 1083 // so we don't have to break the cycle. Note that it is possible to | |
| 1084 // have the methodOop live here, in case we unload the nmethod because | |
| 1085 // it is pointing to some oop (other than the methodOop) being unloaded. | |
| 1086 if (_method != NULL) { | |
| 1087 // OSR methods point to the methodOop, but the methodOop does not | |
| 1088 // point back! | |
| 1089 if (_method->code() == this) { | |
| 1090 _method->clear_code(); // Break a cycle | |
| 1091 } | |
| 1092 inc_decompile_count(); // Last chance to make a mark on the MDO | |
| 1093 _method = NULL; // Clear the method of this dead nmethod | |
| 1094 } | |
| 1095 // Make the class unloaded - i.e., change state and notify sweeper | |
| 1096 check_safepoint(); | |
| 1097 if (is_in_use()) { | |
| 1098 // Transitioning directly from live to unloaded -- so | |
| 1099 // we need to force a cache clean-up; remember this | |
| 1100 // for later on. | |
| 1101 CodeCache::set_needs_cache_clean(true); | |
| 1102 } | |
| 1103 flags.state = unloaded; | |
| 1104 | |
| 1105 // The methodOop is gone at this point | |
| 1106 assert(_method == NULL, "Tautology"); | |
| 1107 | |
| 1108 set_link(NULL); | |
| 1109 NMethodSweeper::notify(this); | |
| 1110 } | |
| 1111 | |
| 1112 void nmethod::invalidate_osr_method() { | |
| 1113 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); | |
| 1114 if (_entry_bci != InvalidOSREntryBci) | |
| 1115 inc_decompile_count(); | |
| 1116 // Remove from list of active nmethods | |
| 1117 if (method() != NULL) | |
| 1118 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this); | |
| 1119 // Set entry as invalid | |
| 1120 _entry_bci = InvalidOSREntryBci; | |
| 1121 } | |
| 1122 | |
| 1123 void nmethod::log_state_change(int state) const { | |
| 1124 if (LogCompilation) { | |
| 1125 if (xtty != NULL) { | |
| 1126 ttyLocker ttyl; // keep the following output all in one block | |
| 1127 xtty->begin_elem("make_not_entrant %sthread='" UINTX_FORMAT "'", | |
| 1128 (state == zombie ? "zombie='1' " : ""), | |
| 1129 os::current_thread_id()); | |
| 1130 log_identity(xtty); | |
| 1131 xtty->stamp(); | |
| 1132 xtty->end_elem(); | |
| 1133 } | |
| 1134 } | |
| 1135 if (PrintCompilation) { | |
| 1136 print_on(tty, state == zombie ? "made zombie " : "made not entrant "); | |
| 1137 tty->cr(); | |
| 1138 } | |
| 1139 } | |
| 1140 | |
| 1141 // Common functionality for both make_not_entrant and make_zombie | |
| 1142 void nmethod::make_not_entrant_or_zombie(int state) { | |
| 1143 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); | |
| 1144 | |
| 1145 // Code for an on-stack-replacement nmethod is removed when a class gets unloaded. | |
| 1146 // They never become zombie/non-entrant, so the nmethod sweeper will never remove | |
| 1147 // them. Instead the entry_bci is set to InvalidOSREntryBci, so the osr nmethod | |
| 1148 // will never be used anymore. That the nmethods only gets removed when class unloading | |
| 1149 // happens, make life much simpler, since the nmethods are not just going to disappear | |
| 1150 // out of the blue. | |
| 1151 if (is_osr_only_method()) { | |
| 1152 if (osr_entry_bci() != InvalidOSREntryBci) { | |
| 1153 // only log this once | |
| 1154 log_state_change(state); | |
| 1155 } | |
| 1156 invalidate_osr_method(); | |
| 1157 return; | |
| 1158 } | |
| 1159 | |
| 1160 // If the method is already zombie or set to the state we want, nothing to do | |
| 1161 if (is_zombie() || (state == not_entrant && is_not_entrant())) { | |
| 1162 return; | |
| 1163 } | |
| 1164 | |
| 1165 log_state_change(state); | |
| 1166 | |
| 1167 // Make sure the nmethod is not flushed in case of a safepoint in code below. | |
| 1168 nmethodLocker nml(this); | |
| 1169 | |
| 1170 { | |
| 1171 // Enter critical section. Does not block for safepoint. | |
| 1172 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
| 1173 // The caller can be calling the method statically or through an inline | |
| 1174 // cache call. | |
| 1175 if (!is_not_entrant()) { | |
| 1176 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), | |
| 1177 SharedRuntime::get_handle_wrong_method_stub()); | |
| 1178 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, ""); | |
| 1179 } | |
| 1180 | |
| 1181 // When the nmethod becomes zombie it is no longer alive so the | |
| 1182 // dependencies must be flushed. nmethods in the not_entrant | |
| 1183 // state will be flushed later when the transition to zombie | |
| 1184 // happens or they get unloaded. | |
| 1185 if (state == zombie) { | |
| 1186 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); | |
| 1187 flush_dependencies(NULL); | |
| 1188 } else { | |
| 1189 assert(state == not_entrant, "other cases may need to be handled differently"); | |
| 1190 } | |
| 1191 | |
| 1192 // Change state | |
| 1193 flags.state = state; | |
| 1194 } // leave critical region under Patching_lock | |
| 1195 | |
| 1196 if (state == not_entrant) { | |
| 1197 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this); | |
| 1198 } else { | |
| 1199 Events::log("Make nmethod zombie " INTPTR_FORMAT, this); | |
| 1200 } | |
| 1201 | |
| 1202 if (TraceCreateZombies) { | |
| 1203 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); | |
| 1204 } | |
| 1205 | |
| 1206 // Make sweeper aware that there is a zombie method that needs to be removed | |
| 1207 NMethodSweeper::notify(this); | |
| 1208 | |
| 1209 // not_entrant only stuff | |
| 1210 if (state == not_entrant) { | |
| 1211 mark_as_seen_on_stack(); | |
| 1212 } | |
| 1213 | |
| 1214 // It's a true state change, so mark the method as decompiled. | |
| 1215 inc_decompile_count(); | |
| 1216 | |
| 1217 | |
| 1218 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event | |
| 1219 // and it hasn't already been reported for this nmethod then report it now. | |
| 1220 // (the event may have been reported earilier if the GC marked it for unloading). | |
| 1221 if (state == zombie) { | |
| 1222 | |
| 1223 DTRACE_METHOD_UNLOAD_PROBE(method()); | |
| 1224 | |
| 1225 if (JvmtiExport::should_post_compiled_method_unload() && | |
| 1226 !unload_reported()) { | |
| 1227 assert(method() != NULL, "checking"); | |
| 1228 { | |
| 1229 HandleMark hm; | |
| 1230 JvmtiExport::post_compiled_method_unload_at_safepoint( | |
| 1231 method()->jmethod_id(), code_begin()); | |
| 1232 } | |
| 1233 set_unload_reported(); | |
| 1234 } | |
| 1235 } | |
| 1236 | |
| 1237 | |
| 1238 // Zombie only stuff | |
| 1239 if (state == zombie) { | |
| 1240 VTune::delete_nmethod(this); | |
| 1241 } | |
| 1242 | |
| 1243 // Check whether method got unloaded at a safepoint before this, | |
| 1244 // if so we can skip the flushing steps below | |
| 1245 if (method() == NULL) return; | |
| 1246 | |
| 1247 // Remove nmethod from method. | |
| 1248 // We need to check if both the _code and _from_compiled_code_entry_point | |
| 1249 // refer to this nmethod because there is a race in setting these two fields | |
| 1250 // in methodOop as seen in bugid 4947125. | |
| 1251 // If the vep() points to the zombie nmethod, the memory for the nmethod | |
| 1252 // could be flushed and the compiler and vtable stubs could still call | |
| 1253 // through it. | |
| 1254 if (method()->code() == this || | |
| 1255 method()->from_compiled_entry() == verified_entry_point()) { | |
| 1256 HandleMark hm; | |
| 1257 method()->clear_code(); | |
| 1258 } | |
| 1259 } | |
| 1260 | |
| 1261 | |
| 1262 #ifndef PRODUCT | |
| 1263 void nmethod::check_safepoint() { | |
| 1264 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 1265 } | |
| 1266 #endif | |
| 1267 | |
| 1268 | |
| 1269 void nmethod::flush() { | |
| 1270 // Note that there are no valid oops in the nmethod anymore. | |
| 1271 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); | |
| 1272 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); | |
| 1273 | |
| 1274 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); | |
| 1275 check_safepoint(); | |
| 1276 | |
| 1277 // completely deallocate this method | |
| 1278 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, ""); | |
| 1279 if (PrintMethodFlushing) { | |
| 1280 tty->print_cr("*flushing nmethod " INTPTR_FORMAT ". Live blobs: %d", this, CodeCache::nof_blobs()); | |
| 1281 } | |
| 1282 | |
| 1283 // We need to deallocate any ExceptionCache data. | |
| 1284 // Note that we do not need to grab the nmethod lock for this, it | |
| 1285 // better be thread safe if we're disposing of it! | |
| 1286 ExceptionCache* ec = exception_cache(); | |
| 1287 set_exception_cache(NULL); | |
| 1288 while(ec != NULL) { | |
| 1289 ExceptionCache* next = ec->next(); | |
| 1290 delete ec; | |
| 1291 ec = next; | |
| 1292 } | |
| 1293 | |
| 1294 ((CodeBlob*)(this))->flush(); | |
| 1295 | |
| 1296 CodeCache::free(this); | |
| 1297 } | |
| 1298 | |
| 1299 | |
| 1300 // | |
| 1301 // Notify all classes this nmethod is dependent on that it is no | |
| 1302 // longer dependent. This should only be called in two situations. | |
| 1303 // First, when a nmethod transitions to a zombie all dependents need | |
| 1304 // to be clear. Since zombification happens at a safepoint there's no | |
| 1305 // synchronization issues. The second place is a little more tricky. | |
| 1306 // During phase 1 of mark sweep class unloading may happen and as a | |
| 1307 // result some nmethods may get unloaded. In this case the flushing | |
| 1308 // of dependencies must happen during phase 1 since after GC any | |
| 1309 // dependencies in the unloaded nmethod won't be updated, so | |
| 1310 // traversing the dependency information in unsafe. In that case this | |
| 1311 // function is called with a non-NULL argument and this function only | |
| 1312 // notifies instanceKlasses that are reachable | |
| 1313 | |
| 1314 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { | |
| 1315 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); | |
| 1316 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), | |
| 1317 "is_alive is non-NULL if and only if we are called during GC"); | |
| 1318 if (!has_flushed_dependencies()) { | |
| 1319 set_has_flushed_dependencies(); | |
| 1320 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
| 1321 klassOop klass = deps.context_type(); | |
| 1322 if (klass == NULL) continue; // ignore things like evol_method | |
| 1323 | |
| 1324 // During GC the is_alive closure is non-NULL, and is used to | |
| 1325 // determine liveness of dependees that need to be updated. | |
| 1326 if (is_alive == NULL || is_alive->do_object_b(klass)) { | |
| 1327 instanceKlass::cast(klass)->remove_dependent_nmethod(this); | |
| 1328 } | |
| 1329 } | |
| 1330 } | |
| 1331 } | |
| 1332 | |
| 1333 | |
| 1334 // If this oop is not live, the nmethod can be unloaded. | |
| 1335 bool nmethod::can_unload(BoolObjectClosure* is_alive, | |
| 1336 OopClosure* keep_alive, | |
| 1337 oop* root, bool unloading_occurred) { | |
| 1338 assert(root != NULL, "just checking"); | |
| 1339 oop obj = *root; | |
| 1340 if (obj == NULL || is_alive->do_object_b(obj)) { | |
| 1341 return false; | |
| 1342 } | |
| 1343 if (obj->is_compiledICHolder()) { | |
| 1344 compiledICHolderOop cichk_oop = compiledICHolderOop(obj); | |
| 1345 if (is_alive->do_object_b( | |
| 1346 cichk_oop->holder_method()->method_holder()) && | |
| 1347 is_alive->do_object_b(cichk_oop->holder_klass())) { | |
| 1348 // The oop should be kept alive | |
| 1349 keep_alive->do_oop(root); | |
| 1350 return false; | |
| 1351 } | |
| 1352 } | |
|
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|
1353 assert(unloading_occurred, "Inconsistency in unloading"); |
| 0 | 1354 make_unloaded(is_alive, obj); |
| 1355 return true; | |
| 1356 } | |
| 1357 | |
| 1358 // ------------------------------------------------------------------ | |
| 1359 // post_compiled_method_load_event | |
| 1360 // new method for install_code() path | |
| 1361 // Transfer information from compilation to jvmti | |
| 1362 void nmethod::post_compiled_method_load_event() { | |
| 1363 | |
| 1364 methodOop moop = method(); | |
| 1365 HS_DTRACE_PROBE8(hotspot, compiled__method__load, | |
| 1366 moop->klass_name()->bytes(), | |
| 1367 moop->klass_name()->utf8_length(), | |
| 1368 moop->name()->bytes(), | |
| 1369 moop->name()->utf8_length(), | |
| 1370 moop->signature()->bytes(), | |
| 1371 moop->signature()->utf8_length(), | |
| 1372 code_begin(), code_size()); | |
| 1373 | |
| 1374 if (JvmtiExport::should_post_compiled_method_load()) { | |
| 1375 JvmtiExport::post_compiled_method_load(this); | |
| 1376 } | |
| 1377 } | |
| 1378 | |
| 1379 void nmethod::post_compiled_method_unload() { | |
| 1380 assert(_method != NULL && !is_unloaded(), "just checking"); | |
| 1381 DTRACE_METHOD_UNLOAD_PROBE(method()); | |
| 1382 | |
| 1383 // If a JVMTI agent has enabled the CompiledMethodUnload event then | |
| 1384 // post the event. Sometime later this nmethod will be made a zombie by | |
| 1385 // the sweeper but the methodOop will not be valid at that point. | |
| 1386 if (JvmtiExport::should_post_compiled_method_unload()) { | |
| 1387 assert(!unload_reported(), "already unloaded"); | |
| 1388 HandleMark hm; | |
| 1389 JvmtiExport::post_compiled_method_unload_at_safepoint( | |
| 1390 method()->jmethod_id(), code_begin()); | |
| 1391 } | |
| 1392 | |
| 1393 // The JVMTI CompiledMethodUnload event can be enabled or disabled at | |
| 1394 // any time. As the nmethod is being unloaded now we mark it has | |
| 1395 // having the unload event reported - this will ensure that we don't | |
| 1396 // attempt to report the event in the unlikely scenario where the | |
| 1397 // event is enabled at the time the nmethod is made a zombie. | |
| 1398 set_unload_reported(); | |
| 1399 } | |
| 1400 | |
| 1401 // This is called at the end of the strong tracing/marking phase of a | |
| 1402 // GC to unload an nmethod if it contains otherwise unreachable | |
| 1403 // oops. | |
| 1404 | |
| 1405 void nmethod::do_unloading(BoolObjectClosure* is_alive, | |
| 1406 OopClosure* keep_alive, bool unloading_occurred) { | |
| 1407 // Make sure the oop's ready to receive visitors | |
| 1408 assert(!is_zombie() && !is_unloaded(), | |
| 1409 "should not call follow on zombie or unloaded nmethod"); | |
| 1410 | |
| 1411 // If the method is not entrant then a JMP is plastered over the | |
| 1412 // first few bytes. If an oop in the old code was there, that oop | |
| 1413 // should not get GC'd. Skip the first few bytes of oops on | |
| 1414 // not-entrant methods. | |
| 1415 address low_boundary = verified_entry_point(); | |
| 1416 if (is_not_entrant()) { | |
| 1417 low_boundary += NativeJump::instruction_size; | |
| 1418 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. | |
| 1419 // (See comment above.) | |
| 1420 } | |
| 1421 | |
| 1422 // The RedefineClasses() API can cause the class unloading invariant | |
| 1423 // to no longer be true. See jvmtiExport.hpp for details. | |
| 1424 // Also, leave a debugging breadcrumb in local flag. | |
| 1425 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); | |
| 1426 if (a_class_was_redefined) { | |
| 1427 // This set of the unloading_occurred flag is done before the | |
| 1428 // call to post_compiled_method_unload() so that the unloading | |
| 1429 // of this nmethod is reported. | |
| 1430 unloading_occurred = true; | |
| 1431 } | |
| 1432 | |
| 1433 // Follow methodOop | |
| 1434 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) { | |
| 1435 return; | |
| 1436 } | |
| 1437 | |
| 1438 // Exception cache | |
| 1439 ExceptionCache* ec = exception_cache(); | |
| 1440 while (ec != NULL) { | |
| 1441 oop* ex_addr = (oop*)ec->exception_type_addr(); | |
| 1442 oop ex = *ex_addr; | |
| 1443 ExceptionCache* next_ec = ec->next(); | |
| 1444 if (ex != NULL && !is_alive->do_object_b(ex)) { | |
| 1445 assert(!ex->is_compiledICHolder(), "Possible error here"); | |
| 1446 remove_from_exception_cache(ec); | |
| 1447 } | |
| 1448 ec = next_ec; | |
| 1449 } | |
| 1450 | |
| 1451 // If class unloading occurred we first iterate over all inline caches and | |
| 1452 // clear ICs where the cached oop is referring to an unloaded klass or method. | |
| 1453 // The remaining live cached oops will be traversed in the relocInfo::oop_type | |
| 1454 // iteration below. | |
| 1455 if (unloading_occurred) { | |
| 1456 RelocIterator iter(this, low_boundary); | |
| 1457 while(iter.next()) { | |
| 1458 if (iter.type() == relocInfo::virtual_call_type) { | |
| 1459 CompiledIC *ic = CompiledIC_at(iter.reloc()); | |
| 1460 oop ic_oop = ic->cached_oop(); | |
| 1461 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) { | |
| 1462 // The only exception is compiledICHolder oops which may | |
| 1463 // yet be marked below. (We check this further below). | |
| 1464 if (ic_oop->is_compiledICHolder()) { | |
| 1465 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop); | |
| 1466 if (is_alive->do_object_b( | |
| 1467 cichk_oop->holder_method()->method_holder()) && | |
| 1468 is_alive->do_object_b(cichk_oop->holder_klass())) { | |
| 1469 continue; | |
| 1470 } | |
| 1471 } | |
| 1472 ic->set_to_clean(); | |
| 1473 assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared") | |
| 1474 } | |
| 1475 } | |
| 1476 } | |
| 1477 } | |
| 1478 | |
| 1479 // Compiled code | |
| 1480 RelocIterator iter(this, low_boundary); | |
| 1481 while (iter.next()) { | |
| 1482 if (iter.type() == relocInfo::oop_type) { | |
| 1483 oop_Relocation* r = iter.oop_reloc(); | |
| 1484 // In this loop, we must only traverse those oops directly embedded in | |
| 1485 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. | |
| 1486 assert(1 == (r->oop_is_immediate()) + | |
| 1487 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), | |
| 1488 "oop must be found in exactly one place"); | |
| 1489 if (r->oop_is_immediate() && r->oop_value() != NULL) { | |
| 1490 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) { | |
| 1491 return; | |
| 1492 } | |
| 1493 } | |
| 1494 } | |
| 1495 } | |
| 1496 | |
| 1497 | |
| 1498 // Scopes | |
| 1499 for (oop* p = oops_begin(); p < oops_end(); p++) { | |
| 1500 if (*p == Universe::non_oop_word()) continue; // skip non-oops | |
| 1501 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) { | |
| 1502 return; | |
| 1503 } | |
| 1504 } | |
| 1505 | |
| 1506 #ifndef PRODUCT | |
| 1507 // This nmethod was not unloaded; check below that all CompiledICs | |
| 1508 // refer to marked oops. | |
| 1509 { | |
| 1510 RelocIterator iter(this, low_boundary); | |
| 1511 while (iter.next()) { | |
| 1512 if (iter.type() == relocInfo::virtual_call_type) { | |
| 1513 CompiledIC *ic = CompiledIC_at(iter.reloc()); | |
| 1514 oop ic_oop = ic->cached_oop(); | |
| 1515 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop), | |
| 1516 "Found unmarked ic_oop in reachable nmethod"); | |
| 1517 } | |
| 1518 } | |
| 1519 } | |
| 1520 #endif // !PRODUCT | |
| 1521 } | |
| 1522 | |
| 1523 void nmethod::oops_do(OopClosure* f) { | |
| 1524 // make sure the oops ready to receive visitors | |
| 1525 assert(!is_zombie() && !is_unloaded(), | |
| 1526 "should not call follow on zombie or unloaded nmethod"); | |
| 1527 | |
| 1528 // If the method is not entrant or zombie then a JMP is plastered over the | |
| 1529 // first few bytes. If an oop in the old code was there, that oop | |
| 1530 // should not get GC'd. Skip the first few bytes of oops on | |
| 1531 // not-entrant methods. | |
| 1532 address low_boundary = verified_entry_point(); | |
| 1533 if (is_not_entrant()) { | |
| 1534 low_boundary += NativeJump::instruction_size; | |
| 1535 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. | |
| 1536 // (See comment above.) | |
| 1537 } | |
| 1538 | |
| 1539 // Compiled code | |
| 1540 f->do_oop((oop*) &_method); | |
| 1541 ExceptionCache* ec = exception_cache(); | |
| 1542 while(ec != NULL) { | |
| 1543 f->do_oop((oop*)ec->exception_type_addr()); | |
| 1544 ec = ec->next(); | |
| 1545 } | |
| 1546 | |
| 1547 RelocIterator iter(this, low_boundary); | |
| 1548 while (iter.next()) { | |
| 1549 if (iter.type() == relocInfo::oop_type ) { | |
| 1550 oop_Relocation* r = iter.oop_reloc(); | |
| 1551 // In this loop, we must only follow those oops directly embedded in | |
| 1552 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. | |
| 1553 assert(1 == (r->oop_is_immediate()) + (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), "oop must be found in exactly one place"); | |
| 1554 if (r->oop_is_immediate() && r->oop_value() != NULL) { | |
| 1555 f->do_oop(r->oop_addr()); | |
| 1556 } | |
| 1557 } | |
| 1558 } | |
| 1559 | |
| 1560 // Scopes | |
| 1561 for (oop* p = oops_begin(); p < oops_end(); p++) { | |
| 1562 if (*p == Universe::non_oop_word()) continue; // skip non-oops | |
| 1563 f->do_oop(p); | |
| 1564 } | |
| 1565 } | |
| 1566 | |
| 1567 // Method that knows how to preserve outgoing arguments at call. This method must be | |
| 1568 // called with a frame corresponding to a Java invoke | |
| 1569 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { | |
| 1570 if (!method()->is_native()) { | |
| 1571 SimpleScopeDesc ssd(this, fr.pc()); | |
| 1572 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci()); | |
| 1573 bool is_static = call->is_invokestatic(); | |
| 1574 symbolOop signature = call->signature(); | |
| 1575 fr.oops_compiled_arguments_do(signature, is_static, reg_map, f); | |
| 1576 } | |
| 1577 } | |
| 1578 | |
| 1579 | |
| 1580 oop nmethod::embeddedOop_at(u_char* p) { | |
| 1581 RelocIterator iter(this, p, p + oopSize); | |
| 1582 while (iter.next()) | |
| 1583 if (iter.type() == relocInfo::oop_type) { | |
| 1584 return iter.oop_reloc()->oop_value(); | |
| 1585 } | |
| 1586 return NULL; | |
| 1587 } | |
| 1588 | |
| 1589 | |
| 1590 inline bool includes(void* p, void* from, void* to) { | |
| 1591 return from <= p && p < to; | |
| 1592 } | |
| 1593 | |
| 1594 | |
| 1595 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { | |
| 1596 assert(count >= 2, "must be sentinel values, at least"); | |
| 1597 | |
| 1598 #ifdef ASSERT | |
| 1599 // must be sorted and unique; we do a binary search in find_pc_desc() | |
| 1600 int prev_offset = pcs[0].pc_offset(); | |
| 1601 assert(prev_offset == PcDesc::lower_offset_limit, | |
| 1602 "must start with a sentinel"); | |
| 1603 for (int i = 1; i < count; i++) { | |
| 1604 int this_offset = pcs[i].pc_offset(); | |
| 1605 assert(this_offset > prev_offset, "offsets must be sorted"); | |
| 1606 prev_offset = this_offset; | |
| 1607 } | |
| 1608 assert(prev_offset == PcDesc::upper_offset_limit, | |
| 1609 "must end with a sentinel"); | |
| 1610 #endif //ASSERT | |
| 1611 | |
| 1612 int size = count * sizeof(PcDesc); | |
| 1613 assert(scopes_pcs_size() >= size, "oob"); | |
| 1614 memcpy(scopes_pcs_begin(), pcs, size); | |
| 1615 | |
| 1616 // Adjust the final sentinel downward. | |
| 1617 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; | |
| 1618 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); | |
| 1619 last_pc->set_pc_offset(instructions_size() + 1); | |
| 1620 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { | |
| 1621 // Fill any rounding gaps with copies of the last record. | |
| 1622 last_pc[1] = last_pc[0]; | |
| 1623 } | |
| 1624 // The following assert could fail if sizeof(PcDesc) is not | |
| 1625 // an integral multiple of oopSize (the rounding term). | |
| 1626 // If it fails, change the logic to always allocate a multiple | |
| 1627 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. | |
| 1628 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); | |
| 1629 } | |
| 1630 | |
| 1631 void nmethod::copy_scopes_data(u_char* buffer, int size) { | |
| 1632 assert(scopes_data_size() >= size, "oob"); | |
| 1633 memcpy(scopes_data_begin(), buffer, size); | |
| 1634 } | |
| 1635 | |
| 1636 | |
| 1637 #ifdef ASSERT | |
| 1638 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { | |
| 1639 PcDesc* lower = nm->scopes_pcs_begin(); | |
| 1640 PcDesc* upper = nm->scopes_pcs_end(); | |
| 1641 lower += 1; // exclude initial sentinel | |
| 1642 PcDesc* res = NULL; | |
| 1643 for (PcDesc* p = lower; p < upper; p++) { | |
| 1644 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc | |
| 1645 if (match_desc(p, pc_offset, approximate)) { | |
| 1646 if (res == NULL) | |
| 1647 res = p; | |
| 1648 else | |
| 1649 res = (PcDesc*) badAddress; | |
| 1650 } | |
| 1651 } | |
| 1652 return res; | |
| 1653 } | |
| 1654 #endif | |
| 1655 | |
| 1656 | |
| 1657 // Finds a PcDesc with real-pc equal to "pc" | |
| 1658 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { | |
| 1659 address base_address = instructions_begin(); | |
| 1660 if ((pc < base_address) || | |
| 1661 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { | |
| 1662 return NULL; // PC is wildly out of range | |
| 1663 } | |
| 1664 int pc_offset = (int) (pc - base_address); | |
| 1665 | |
| 1666 // Check the PcDesc cache if it contains the desired PcDesc | |
| 1667 // (This as an almost 100% hit rate.) | |
| 1668 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); | |
| 1669 if (res != NULL) { | |
| 1670 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); | |
| 1671 return res; | |
| 1672 } | |
| 1673 | |
| 1674 // Fallback algorithm: quasi-linear search for the PcDesc | |
| 1675 // Find the last pc_offset less than the given offset. | |
| 1676 // The successor must be the required match, if there is a match at all. | |
| 1677 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) | |
| 1678 PcDesc* lower = scopes_pcs_begin(); | |
| 1679 PcDesc* upper = scopes_pcs_end(); | |
| 1680 upper -= 1; // exclude final sentinel | |
| 1681 if (lower >= upper) return NULL; // native method; no PcDescs at all | |
| 1682 | |
| 1683 #define assert_LU_OK \ | |
| 1684 /* invariant on lower..upper during the following search: */ \ | |
| 1685 assert(lower->pc_offset() < pc_offset, "sanity"); \ | |
| 1686 assert(upper->pc_offset() >= pc_offset, "sanity") | |
| 1687 assert_LU_OK; | |
| 1688 | |
| 1689 // Use the last successful return as a split point. | |
| 1690 PcDesc* mid = _pc_desc_cache.last_pc_desc(); | |
| 1691 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); | |
| 1692 if (mid->pc_offset() < pc_offset) { | |
| 1693 lower = mid; | |
| 1694 } else { | |
| 1695 upper = mid; | |
| 1696 } | |
| 1697 | |
| 1698 // Take giant steps at first (4096, then 256, then 16, then 1) | |
| 1699 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); | |
| 1700 const int RADIX = (1 << LOG2_RADIX); | |
| 1701 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { | |
| 1702 while ((mid = lower + step) < upper) { | |
| 1703 assert_LU_OK; | |
| 1704 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); | |
| 1705 if (mid->pc_offset() < pc_offset) { | |
| 1706 lower = mid; | |
| 1707 } else { | |
| 1708 upper = mid; | |
| 1709 break; | |
| 1710 } | |
| 1711 } | |
| 1712 assert_LU_OK; | |
| 1713 } | |
| 1714 | |
| 1715 // Sneak up on the value with a linear search of length ~16. | |
| 1716 while (true) { | |
| 1717 assert_LU_OK; | |
| 1718 mid = lower + 1; | |
| 1719 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); | |
| 1720 if (mid->pc_offset() < pc_offset) { | |
| 1721 lower = mid; | |
| 1722 } else { | |
| 1723 upper = mid; | |
| 1724 break; | |
| 1725 } | |
| 1726 } | |
| 1727 #undef assert_LU_OK | |
| 1728 | |
| 1729 if (match_desc(upper, pc_offset, approximate)) { | |
| 1730 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); | |
| 1731 _pc_desc_cache.add_pc_desc(upper); | |
| 1732 return upper; | |
| 1733 } else { | |
| 1734 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); | |
| 1735 return NULL; | |
| 1736 } | |
| 1737 } | |
| 1738 | |
| 1739 | |
| 1740 bool nmethod::check_all_dependencies() { | |
| 1741 bool found_check = false; | |
| 1742 // wholesale check of all dependencies | |
| 1743 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
| 1744 if (deps.check_dependency() != NULL) { | |
| 1745 found_check = true; | |
| 1746 NOT_DEBUG(break); | |
| 1747 } | |
| 1748 } | |
| 1749 return found_check; // tell caller if we found anything | |
| 1750 } | |
| 1751 | |
| 1752 bool nmethod::check_dependency_on(DepChange& changes) { | |
| 1753 // What has happened: | |
| 1754 // 1) a new class dependee has been added | |
| 1755 // 2) dependee and all its super classes have been marked | |
| 1756 bool found_check = false; // set true if we are upset | |
| 1757 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
| 1758 // Evaluate only relevant dependencies. | |
| 1759 if (deps.spot_check_dependency_at(changes) != NULL) { | |
| 1760 found_check = true; | |
| 1761 NOT_DEBUG(break); | |
| 1762 } | |
| 1763 } | |
| 1764 return found_check; | |
| 1765 } | |
| 1766 | |
| 1767 bool nmethod::is_evol_dependent_on(klassOop dependee) { | |
| 1768 instanceKlass *dependee_ik = instanceKlass::cast(dependee); | |
| 1769 objArrayOop dependee_methods = dependee_ik->methods(); | |
| 1770 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
| 1771 if (deps.type() == Dependencies::evol_method) { | |
| 1772 methodOop method = deps.method_argument(0); | |
| 1773 for (int j = 0; j < dependee_methods->length(); j++) { | |
| 1774 if ((methodOop) dependee_methods->obj_at(j) == method) { | |
| 1775 // RC_TRACE macro has an embedded ResourceMark | |
| 1776 RC_TRACE(0x01000000, | |
| 1777 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", | |
| 1778 _method->method_holder()->klass_part()->external_name(), | |
| 1779 _method->name()->as_C_string(), | |
| 1780 _method->signature()->as_C_string(), compile_id(), | |
| 1781 method->method_holder()->klass_part()->external_name(), | |
| 1782 method->name()->as_C_string(), | |
| 1783 method->signature()->as_C_string())); | |
| 1784 if (TraceDependencies || LogCompilation) | |
| 1785 deps.log_dependency(dependee); | |
| 1786 return true; | |
| 1787 } | |
| 1788 } | |
| 1789 } | |
| 1790 } | |
| 1791 return false; | |
| 1792 } | |
| 1793 | |
| 1794 // Called from mark_for_deoptimization, when dependee is invalidated. | |
| 1795 bool nmethod::is_dependent_on_method(methodOop dependee) { | |
| 1796 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
| 1797 if (deps.type() != Dependencies::evol_method) | |
| 1798 continue; | |
| 1799 methodOop method = deps.method_argument(0); | |
| 1800 if (method == dependee) return true; | |
| 1801 } | |
| 1802 return false; | |
| 1803 } | |
| 1804 | |
| 1805 | |
| 1806 bool nmethod::is_patchable_at(address instr_addr) { | |
| 1807 assert (code_contains(instr_addr), "wrong nmethod used"); | |
| 1808 if (is_zombie()) { | |
| 1809 // a zombie may never be patched | |
| 1810 return false; | |
| 1811 } | |
| 1812 return true; | |
| 1813 } | |
| 1814 | |
| 1815 | |
| 1816 address nmethod::continuation_for_implicit_exception(address pc) { | |
| 1817 // Exception happened outside inline-cache check code => we are inside | |
| 1818 // an active nmethod => use cpc to determine a return address | |
| 1819 int exception_offset = pc - instructions_begin(); | |
| 1820 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); | |
| 1821 #ifdef ASSERT | |
| 1822 if (cont_offset == 0) { | |
| 1823 Thread* thread = ThreadLocalStorage::get_thread_slow(); | |
| 1824 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY | |
| 1825 HandleMark hm(thread); | |
| 1826 ResourceMark rm(thread); | |
| 1827 CodeBlob* cb = CodeCache::find_blob(pc); | |
| 1828 assert(cb != NULL && cb == this, ""); | |
| 1829 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); | |
| 1830 print(); | |
| 1831 method()->print_codes(); | |
| 1832 print_code(); | |
| 1833 print_pcs(); | |
| 1834 } | |
| 1835 #endif | |
| 1836 guarantee(cont_offset != 0, "unhandled implicit exception in compiled code"); | |
| 1837 return instructions_begin() + cont_offset; | |
| 1838 } | |
| 1839 | |
| 1840 | |
| 1841 | |
| 1842 void nmethod_init() { | |
| 1843 // make sure you didn't forget to adjust the filler fields | |
| 1844 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word"); | |
| 1845 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); | |
| 1846 } | |
| 1847 | |
| 1848 | |
| 1849 //------------------------------------------------------------------------------------------- | |
| 1850 | |
| 1851 | |
| 1852 // QQQ might we make this work from a frame?? | |
| 1853 nmethodLocker::nmethodLocker(address pc) { | |
| 1854 CodeBlob* cb = CodeCache::find_blob(pc); | |
| 1855 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); | |
| 1856 _nm = (nmethod*)cb; | |
| 1857 lock_nmethod(_nm); | |
| 1858 } | |
| 1859 | |
| 1860 void nmethodLocker::lock_nmethod(nmethod* nm) { | |
| 1861 if (nm == NULL) return; | |
| 1862 Atomic::inc(&nm->_lock_count); | |
| 1863 guarantee(!nm->is_zombie(), "cannot lock a zombie method"); | |
| 1864 } | |
| 1865 | |
| 1866 void nmethodLocker::unlock_nmethod(nmethod* nm) { | |
| 1867 if (nm == NULL) return; | |
| 1868 Atomic::dec(&nm->_lock_count); | |
| 1869 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); | |
| 1870 } | |
| 1871 | |
| 1872 bool nmethod::is_deopt_pc(address pc) { | |
| 1873 bool ret = pc == deopt_handler_begin(); | |
| 1874 return ret; | |
| 1875 } | |
| 1876 | |
| 1877 | |
| 1878 // ----------------------------------------------------------------------------- | |
| 1879 // Verification | |
| 1880 | |
| 1881 void nmethod::verify() { | |
| 1882 | |
| 1883 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant | |
| 1884 // seems odd. | |
| 1885 | |
| 1886 if( is_zombie() || is_not_entrant() ) | |
| 1887 return; | |
| 1888 | |
| 1889 // Make sure all the entry points are correctly aligned for patching. | |
| 1890 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); | |
| 1891 | |
| 1892 assert(method()->is_oop(), "must be valid"); | |
| 1893 | |
| 1894 ResourceMark rm; | |
| 1895 | |
| 1896 if (!CodeCache::contains(this)) { | |
| 1897 fatal1("nmethod at " INTPTR_FORMAT " not in zone", this); | |
| 1898 } | |
| 1899 | |
| 1900 if(is_native_method() ) | |
| 1901 return; | |
| 1902 | |
| 1903 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); | |
| 1904 if (nm != this) { | |
| 1905 fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", this); | |
| 1906 } | |
| 1907 | |
| 1908 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { | |
| 1909 if (! p->verify(this)) { | |
| 1910 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); | |
| 1911 } | |
| 1912 } | |
| 1913 | |
| 1914 verify_scopes(); | |
| 1915 } | |
| 1916 | |
| 1917 | |
| 1918 void nmethod::verify_interrupt_point(address call_site) { | |
| 1919 // This code does not work in release mode since | |
| 1920 // owns_lock only is available in debug mode. | |
| 1921 CompiledIC* ic = NULL; | |
| 1922 Thread *cur = Thread::current(); | |
| 1923 if (CompiledIC_lock->owner() == cur || | |
| 1924 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && | |
| 1925 SafepointSynchronize::is_at_safepoint())) { | |
| 1926 ic = CompiledIC_at(call_site); | |
| 1927 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
| 1928 } else { | |
| 1929 MutexLocker ml_verify (CompiledIC_lock); | |
| 1930 ic = CompiledIC_at(call_site); | |
| 1931 } | |
| 1932 PcDesc* pd = pc_desc_at(ic->end_of_call()); | |
| 1933 assert(pd != NULL, "PcDesc must exist"); | |
| 1934 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), | |
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1935 pd->obj_decode_offset(), pd->should_reexecute()); |
| 0 | 1936 !sd->is_top(); sd = sd->sender()) { |
| 1937 sd->verify(); | |
| 1938 } | |
| 1939 } | |
| 1940 | |
| 1941 void nmethod::verify_scopes() { | |
| 1942 if( !method() ) return; // Runtime stubs have no scope | |
| 1943 if (method()->is_native()) return; // Ignore stub methods. | |
| 1944 // iterate through all interrupt point | |
| 1945 // and verify the debug information is valid. | |
| 1946 RelocIterator iter((nmethod*)this); | |
| 1947 while (iter.next()) { | |
| 1948 address stub = NULL; | |
| 1949 switch (iter.type()) { | |
| 1950 case relocInfo::virtual_call_type: | |
| 1951 verify_interrupt_point(iter.addr()); | |
| 1952 break; | |
| 1953 case relocInfo::opt_virtual_call_type: | |
| 1954 stub = iter.opt_virtual_call_reloc()->static_stub(); | |
| 1955 verify_interrupt_point(iter.addr()); | |
| 1956 break; | |
| 1957 case relocInfo::static_call_type: | |
| 1958 stub = iter.static_call_reloc()->static_stub(); | |
| 1959 //verify_interrupt_point(iter.addr()); | |
| 1960 break; | |
| 1961 case relocInfo::runtime_call_type: | |
| 1962 address destination = iter.reloc()->value(); | |
| 1963 // Right now there is no way to find out which entries support | |
| 1964 // an interrupt point. It would be nice if we had this | |
| 1965 // information in a table. | |
| 1966 break; | |
| 1967 } | |
| 1968 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); | |
| 1969 } | |
| 1970 } | |
| 1971 | |
| 1972 | |
| 1973 // ----------------------------------------------------------------------------- | |
| 1974 // Non-product code | |
| 1975 #ifndef PRODUCT | |
| 1976 | |
| 1977 void nmethod::check_store() { | |
| 1978 // Make sure all oops in the compiled code are tenured | |
| 1979 | |
| 1980 RelocIterator iter(this); | |
| 1981 while (iter.next()) { | |
| 1982 if (iter.type() == relocInfo::oop_type) { | |
| 1983 oop_Relocation* reloc = iter.oop_reloc(); | |
| 1984 oop obj = reloc->oop_value(); | |
| 1985 if (obj != NULL && !obj->is_perm()) { | |
| 1986 fatal("must be permanent oop in compiled code"); | |
| 1987 } | |
| 1988 } | |
| 1989 } | |
| 1990 } | |
| 1991 | |
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1992 #endif // PRODUCT |
| 0 | 1993 |
| 1994 // Printing operations | |
| 1995 | |
| 1996 void nmethod::print() const { | |
| 1997 ResourceMark rm; | |
| 1998 ttyLocker ttyl; // keep the following output all in one block | |
| 1999 | |
| 2000 tty->print("Compiled "); | |
| 2001 | |
| 2002 if (is_compiled_by_c1()) { | |
| 2003 tty->print("(c1) "); | |
| 2004 } else if (is_compiled_by_c2()) { | |
| 2005 tty->print("(c2) "); | |
| 2006 } else { | |
| 2007 tty->print("(nm) "); | |
| 2008 } | |
| 2009 | |
| 2010 print_on(tty, "nmethod"); | |
| 2011 tty->cr(); | |
| 2012 if (WizardMode) { | |
| 2013 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); | |
| 2014 tty->print(" for method " INTPTR_FORMAT , (address)method()); | |
| 2015 tty->print(" { "); | |
| 2016 if (version()) tty->print("v%d ", version()); | |
| 2017 if (level()) tty->print("l%d ", level()); | |
| 2018 if (is_in_use()) tty->print("in_use "); | |
| 2019 if (is_not_entrant()) tty->print("not_entrant "); | |
| 2020 if (is_zombie()) tty->print("zombie "); | |
| 2021 if (is_unloaded()) tty->print("unloaded "); | |
| 2022 tty->print_cr("}:"); | |
| 2023 } | |
| 2024 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2025 (address)this, | |
| 2026 (address)this + size(), | |
| 2027 size()); | |
| 2028 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2029 relocation_begin(), | |
| 2030 relocation_end(), | |
| 2031 relocation_size()); | |
| 2032 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2033 code_begin(), | |
| 2034 code_end(), | |
| 2035 code_size()); | |
| 2036 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2037 stub_begin(), | |
| 2038 stub_end(), | |
| 2039 stub_size()); | |
| 2040 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2041 consts_begin(), | |
| 2042 consts_end(), | |
| 2043 consts_size()); | |
| 2044 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2045 scopes_data_begin(), | |
| 2046 scopes_data_end(), | |
| 2047 scopes_data_size()); | |
| 2048 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2049 scopes_pcs_begin(), | |
| 2050 scopes_pcs_end(), | |
| 2051 scopes_pcs_size()); | |
| 2052 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2053 dependencies_begin(), | |
| 2054 dependencies_end(), | |
| 2055 dependencies_size()); | |
| 2056 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2057 handler_table_begin(), | |
| 2058 handler_table_end(), | |
| 2059 handler_table_size()); | |
| 2060 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2061 nul_chk_table_begin(), | |
| 2062 nul_chk_table_end(), | |
| 2063 nul_chk_table_size()); | |
| 2064 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
| 2065 oops_begin(), | |
| 2066 oops_end(), | |
| 2067 oops_size()); | |
| 2068 } | |
| 2069 | |
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2070 void nmethod::print_code() { |
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2071 HandleMark hm; |
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2072 ResourceMark m; |
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2073 Disassembler::decode(this); |
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2074 } |
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2075 |
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2076 |
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2077 #ifndef PRODUCT |
| 0 | 2078 |
| 2079 void nmethod::print_scopes() { | |
| 2080 // Find the first pc desc for all scopes in the code and print it. | |
| 2081 ResourceMark rm; | |
| 2082 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { | |
| 2083 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) | |
| 2084 continue; | |
| 2085 | |
| 2086 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); | |
| 2087 sd->print_on(tty, p); | |
| 2088 } | |
| 2089 } | |
| 2090 | |
| 2091 void nmethod::print_dependencies() { | |
| 2092 ResourceMark rm; | |
| 2093 ttyLocker ttyl; // keep the following output all in one block | |
| 2094 tty->print_cr("Dependencies:"); | |
| 2095 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
| 2096 deps.print_dependency(); | |
| 2097 klassOop ctxk = deps.context_type(); | |
| 2098 if (ctxk != NULL) { | |
| 2099 Klass* k = Klass::cast(ctxk); | |
| 2100 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) { | |
| 30 | 2101 tty->print_cr(" [nmethod<=klass]%s", k->external_name()); |
| 0 | 2102 } |
| 2103 } | |
| 2104 deps.log_dependency(); // put it into the xml log also | |
| 2105 } | |
| 2106 } | |
| 2107 | |
| 2108 | |
| 2109 void nmethod::print_relocations() { | |
| 2110 ResourceMark m; // in case methods get printed via the debugger | |
| 2111 tty->print_cr("relocations:"); | |
| 2112 RelocIterator iter(this); | |
| 2113 iter.print(); | |
| 2114 if (UseRelocIndex) { | |
| 2115 jint* index_end = (jint*)relocation_end() - 1; | |
| 2116 jint index_size = *index_end; | |
| 2117 jint* index_start = (jint*)( (address)index_end - index_size ); | |
| 2118 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); | |
| 2119 if (index_size > 0) { | |
| 2120 jint* ip; | |
| 2121 for (ip = index_start; ip+2 <= index_end; ip += 2) | |
| 2122 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, | |
| 2123 ip[0], | |
| 2124 ip[1], | |
| 2125 header_end()+ip[0], | |
| 2126 relocation_begin()-1+ip[1]); | |
| 2127 for (; ip < index_end; ip++) | |
| 2128 tty->print_cr(" (%d ?)", ip[0]); | |
| 2129 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++); | |
| 2130 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); | |
| 2131 } | |
| 2132 } | |
| 2133 } | |
| 2134 | |
| 2135 | |
| 2136 void nmethod::print_pcs() { | |
| 2137 ResourceMark m; // in case methods get printed via debugger | |
| 2138 tty->print_cr("pc-bytecode offsets:"); | |
| 2139 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { | |
| 2140 p->print(this); | |
| 2141 } | |
| 2142 } | |
| 2143 | |
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2144 #endif // PRODUCT |
| 0 | 2145 |
| 2146 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { | |
| 2147 RelocIterator iter(this, begin, end); | |
| 2148 bool have_one = false; | |
| 2149 while (iter.next()) { | |
| 2150 have_one = true; | |
| 2151 switch (iter.type()) { | |
| 2152 case relocInfo::none: return "no_reloc"; | |
| 2153 case relocInfo::oop_type: { | |
| 2154 stringStream st; | |
| 2155 oop_Relocation* r = iter.oop_reloc(); | |
| 2156 oop obj = r->oop_value(); | |
| 2157 st.print("oop("); | |
| 2158 if (obj == NULL) st.print("NULL"); | |
| 2159 else obj->print_value_on(&st); | |
| 2160 st.print(")"); | |
| 2161 return st.as_string(); | |
| 2162 } | |
| 2163 case relocInfo::virtual_call_type: return "virtual_call"; | |
| 2164 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; | |
| 2165 case relocInfo::static_call_type: return "static_call"; | |
| 2166 case relocInfo::static_stub_type: return "static_stub"; | |
| 2167 case relocInfo::runtime_call_type: return "runtime_call"; | |
| 2168 case relocInfo::external_word_type: return "external_word"; | |
| 2169 case relocInfo::internal_word_type: return "internal_word"; | |
| 2170 case relocInfo::section_word_type: return "section_word"; | |
| 2171 case relocInfo::poll_type: return "poll"; | |
| 2172 case relocInfo::poll_return_type: return "poll_return"; | |
| 2173 case relocInfo::type_mask: return "type_bit_mask"; | |
| 2174 } | |
| 2175 } | |
| 2176 return have_one ? "other" : NULL; | |
| 2177 } | |
| 2178 | |
| 2179 // Return a the last scope in (begin..end] | |
| 2180 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { | |
| 2181 PcDesc* p = pc_desc_near(begin+1); | |
| 2182 if (p != NULL && p->real_pc(this) <= end) { | |
| 2183 return new ScopeDesc(this, p->scope_decode_offset(), | |
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2184 p->obj_decode_offset(), p->should_reexecute()); |
| 0 | 2185 } |
| 2186 return NULL; | |
| 2187 } | |
| 2188 | |
| 2189 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { | |
| 2190 // First, find an oopmap in (begin, end]. | |
| 2191 // We use the odd half-closed interval so that oop maps and scope descs | |
| 2192 // which are tied to the byte after a call are printed with the call itself. | |
| 2193 address base = instructions_begin(); | |
| 2194 OopMapSet* oms = oop_maps(); | |
| 2195 if (oms != NULL) { | |
| 2196 for (int i = 0, imax = oms->size(); i < imax; i++) { | |
| 2197 OopMap* om = oms->at(i); | |
| 2198 address pc = base + om->offset(); | |
| 2199 if (pc > begin) { | |
| 2200 if (pc <= end) { | |
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2201 st->move_to(column); |
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2202 st->print("; "); |
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2203 om->print_on(st); |
| 0 | 2204 } |
| 2205 break; | |
| 2206 } | |
| 2207 } | |
| 2208 } | |
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2209 |
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2210 // Print any debug info present at this pc. |
| 0 | 2211 ScopeDesc* sd = scope_desc_in(begin, end); |
| 2212 if (sd != NULL) { | |
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2213 st->move_to(column); |
| 0 | 2214 if (sd->bci() == SynchronizationEntryBCI) { |
| 2215 st->print(";*synchronization entry"); | |
| 2216 } else { | |
| 2217 if (sd->method().is_null()) { | |
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2218 st->print("method is NULL"); |
| 0 | 2219 } else if (sd->method()->is_native()) { |
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2220 st->print("method is native"); |
| 0 | 2221 } else { |
| 2222 address bcp = sd->method()->bcp_from(sd->bci()); | |
| 2223 Bytecodes::Code bc = Bytecodes::java_code_at(bcp); | |
| 2224 st->print(";*%s", Bytecodes::name(bc)); | |
| 2225 switch (bc) { | |
| 2226 case Bytecodes::_invokevirtual: | |
| 2227 case Bytecodes::_invokespecial: | |
| 2228 case Bytecodes::_invokestatic: | |
| 2229 case Bytecodes::_invokeinterface: | |
| 2230 { | |
| 2231 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci()); | |
| 2232 st->print(" "); | |
| 2233 if (invoke->name() != NULL) | |
| 2234 invoke->name()->print_symbol_on(st); | |
| 2235 else | |
| 2236 st->print("<UNKNOWN>"); | |
| 2237 break; | |
| 2238 } | |
| 2239 case Bytecodes::_getfield: | |
| 2240 case Bytecodes::_putfield: | |
| 2241 case Bytecodes::_getstatic: | |
| 2242 case Bytecodes::_putstatic: | |
| 2243 { | |
| 2244 methodHandle sdm = sd->method(); | |
| 2245 Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci())); | |
| 2246 constantPoolOop sdmc = sdm->constants(); | |
| 2247 symbolOop name = sdmc->name_ref_at(field->index()); | |
| 2248 st->print(" "); | |
| 2249 if (name != NULL) | |
| 2250 name->print_symbol_on(st); | |
| 2251 else | |
| 2252 st->print("<UNKNOWN>"); | |
| 2253 } | |
| 2254 } | |
| 2255 } | |
| 2256 } | |
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2257 |
| 0 | 2258 // Print all scopes |
| 2259 for (;sd != NULL; sd = sd->sender()) { | |
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2260 st->move_to(column); |
| 0 | 2261 st->print("; -"); |
| 2262 if (sd->method().is_null()) { | |
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2263 st->print("method is NULL"); |
| 0 | 2264 } else { |
| 2265 sd->method()->print_short_name(st); | |
| 2266 } | |
| 2267 int lineno = sd->method()->line_number_from_bci(sd->bci()); | |
| 2268 if (lineno != -1) { | |
| 2269 st->print("@%d (line %d)", sd->bci(), lineno); | |
| 2270 } else { | |
| 2271 st->print("@%d", sd->bci()); | |
| 2272 } | |
| 2273 st->cr(); | |
| 2274 } | |
| 2275 } | |
| 2276 | |
| 2277 // Print relocation information | |
| 2278 const char* str = reloc_string_for(begin, end); | |
| 2279 if (str != NULL) { | |
| 2280 if (sd != NULL) st->cr(); | |
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2281 st->move_to(column); |
| 0 | 2282 st->print("; {%s}", str); |
| 2283 } | |
| 2284 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin()); | |
| 2285 if (cont_offset != 0) { | |
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2286 st->move_to(column); |
| 0 | 2287 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset); |
| 2288 } | |
| 2289 | |
| 2290 } | |
| 2291 | |
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2292 #ifndef PRODUCT |
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2293 |
| 0 | 2294 void nmethod::print_value_on(outputStream* st) const { |
| 2295 print_on(st, "nmethod"); | |
| 2296 } | |
| 2297 | |
| 2298 void nmethod::print_calls(outputStream* st) { | |
| 2299 RelocIterator iter(this); | |
| 2300 while (iter.next()) { | |
| 2301 switch (iter.type()) { | |
| 2302 case relocInfo::virtual_call_type: | |
| 2303 case relocInfo::opt_virtual_call_type: { | |
| 2304 VerifyMutexLocker mc(CompiledIC_lock); | |
| 2305 CompiledIC_at(iter.reloc())->print(); | |
| 2306 break; | |
| 2307 } | |
| 2308 case relocInfo::static_call_type: | |
| 2309 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); | |
| 2310 compiledStaticCall_at(iter.reloc())->print(); | |
| 2311 break; | |
| 2312 } | |
| 2313 } | |
| 2314 } | |
| 2315 | |
| 2316 void nmethod::print_handler_table() { | |
| 2317 ExceptionHandlerTable(this).print(); | |
| 2318 } | |
| 2319 | |
| 2320 void nmethod::print_nul_chk_table() { | |
| 2321 ImplicitExceptionTable(this).print(instructions_begin()); | |
| 2322 } | |
| 2323 | |
| 2324 void nmethod::print_statistics() { | |
| 2325 ttyLocker ttyl; | |
| 2326 if (xtty != NULL) xtty->head("statistics type='nmethod'"); | |
| 2327 nmethod_stats.print_native_nmethod_stats(); | |
| 2328 nmethod_stats.print_nmethod_stats(); | |
| 2329 DebugInformationRecorder::print_statistics(); | |
| 2330 nmethod_stats.print_pc_stats(); | |
| 2331 Dependencies::print_statistics(); | |
| 2332 if (xtty != NULL) xtty->tail("statistics"); | |
| 2333 } | |
| 2334 | |
| 2335 #endif // PRODUCT |