1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_CODE_NMETHOD_HPP 26 #define SHARE_VM_CODE_NMETHOD_HPP 27 28 #include "code/codeBlob.hpp" 29 #include "code/pcDesc.hpp" 30 #include "oops/metadata.hpp" 31 32 // This class is used internally by nmethods, to cache 33 // exception/pc/handler information. 34 35 class ExceptionCache : public CHeapObj<mtCode> { 36 friend class VMStructs; 37 private: 38 enum { cache_size = 16 }; 39 Klass* _exception_type; 40 address _pc[cache_size]; 41 address _handler[cache_size]; 42 int _count; 43 ExceptionCache* _next; 44 45 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; } 46 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; } 47 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; } 48 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; } 49 int count() { return _count; } 50 void increment_count() { _count++; } 51 52 public: 53 54 ExceptionCache(Handle exception, address pc, address handler); 55 56 Klass* exception_type() { return _exception_type; } 57 ExceptionCache* next() { return _next; } 58 void set_next(ExceptionCache *ec) { _next = ec; } 59 60 address match(Handle exception, address pc); 61 bool match_exception_with_space(Handle exception) ; 62 address test_address(address addr); 63 bool add_address_and_handler(address addr, address handler) ; 64 }; 65 66 67 // cache pc descs found in earlier inquiries 68 class PcDescCache VALUE_OBJ_CLASS_SPEC { 69 friend class VMStructs; 70 private: 71 enum { cache_size = 4 }; 72 // The array elements MUST be volatile! Several threads may modify 73 // and read from the cache concurrently. find_pc_desc_internal has 74 // returned wrong results. C++ compiler (namely xlC12) may duplicate 75 // C++ field accesses if the elements are not volatile. 76 typedef PcDesc* PcDescPtr; 77 volatile PcDescPtr _pc_descs[cache_size]; // last cache_size pc_descs found 78 public: 79 PcDescCache() { debug_only(_pc_descs[0] = NULL); } 80 void reset_to(PcDesc* initial_pc_desc); 81 PcDesc* find_pc_desc(int pc_offset, bool approximate); 82 void add_pc_desc(PcDesc* pc_desc); 83 PcDesc* last_pc_desc() { return _pc_descs[0]; } 84 }; 85 86 87 // nmethods (native methods) are the compiled code versions of Java methods. 88 // 89 // An nmethod contains: 90 // - header (the nmethod structure) 91 // [Relocation] 92 // - relocation information 93 // - constant part (doubles, longs and floats used in nmethod) 94 // - oop table 95 // [Code] 96 // - code body 97 // - exception handler 98 // - stub code 99 // [Debugging information] 100 // - oop array 101 // - data array 102 // - pcs 103 // [Exception handler table] 104 // - handler entry point array 105 // [Implicit Null Pointer exception table] 106 // - implicit null table array 107 108 class Dependencies; 109 class ExceptionHandlerTable; 110 class ImplicitExceptionTable; 111 class AbstractCompiler; 112 class xmlStream; 113 114 class nmethod : public CodeBlob { 115 friend class VMStructs; 116 friend class NMethodSweeper; 117 friend class CodeCache; // scavengable oops 118 private: 119 120 // GC support to help figure out if an nmethod has been 121 // cleaned/unloaded by the current GC. 122 static unsigned char _global_unloading_clock; 123 124 // Shared fields for all nmethod's 125 Method* _method; 126 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method 127 jmethodID _jmethod_id; // Cache of method()->jmethod_id() 128 129 // To support simple linked-list chaining of nmethods: 130 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head 131 132 union { 133 // Used by G1 to chain nmethods. 134 nmethod* _unloading_next; 135 // Used by non-G1 GCs to chain nmethods. 136 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods 137 }; 138 139 static nmethod* volatile _oops_do_mark_nmethods; 140 nmethod* volatile _oops_do_mark_link; 141 142 AbstractCompiler* _compiler; // The compiler which compiled this nmethod 143 144 // offsets for entry points 145 address _entry_point; // entry point with class check 146 address _verified_entry_point; // entry point without class check 147 address _osr_entry_point; // entry point for on stack replacement 148 149 // Offsets for different nmethod parts 150 int _exception_offset; 151 // All deoptee's will resume execution at this location described by 152 // this offset. 153 int _deoptimize_offset; 154 // All deoptee's at a MethodHandle call site will resume execution 155 // at this location described by this offset. 156 int _deoptimize_mh_offset; 157 // Offset of the unwind handler if it exists 158 int _unwind_handler_offset; 159 160 int _consts_offset; 161 int _stub_offset; 162 int _oops_offset; // offset to where embedded oop table begins (inside data) 163 int _metadata_offset; // embedded meta data table 164 int _scopes_data_offset; 165 int _scopes_pcs_offset; 166 int _dependencies_offset; 167 int _handler_table_offset; 168 int _nul_chk_table_offset; 169 int _nmethod_end_offset; 170 171 // location in frame (offset for sp) that deopt can store the original 172 // pc during a deopt. 173 int _orig_pc_offset; 174 175 int _compile_id; // which compilation made this nmethod 176 int _comp_level; // compilation level 177 178 // protected by CodeCache_lock 179 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) 180 181 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper) 182 bool _marked_for_deoptimization; // Used for stack deoptimization 183 184 // used by jvmti to track if an unload event has been posted for this nmethod. 185 bool _unload_reported; 186 187 // set during construction 188 unsigned int _has_unsafe_access:1; // May fault due to unsafe access. 189 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes? 190 unsigned int _lazy_critical_native:1; // Lazy JNI critical native 191 unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints 192 193 // Protected by Patching_lock 194 volatile unsigned char _state; // {alive, not_entrant, zombie, unloaded} 195 196 volatile unsigned char _unloading_clock; // Incremented after GC unloaded/cleaned the nmethod 197 198 #ifdef ASSERT 199 bool _oops_are_stale; // indicates that it's no longer safe to access oops section 200 #endif 201 202 jbyte _scavenge_root_state; 203 204 #if INCLUDE_RTM_OPT 205 // RTM state at compile time. Used during deoptimization to decide 206 // whether to restart collecting RTM locking abort statistic again. 207 RTMState _rtm_state; 208 #endif 209 210 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed 211 // and is not made into a zombie. However, once the nmethod is made into 212 // a zombie, it will be locked one final time if CompiledMethodUnload 213 // event processing needs to be done. 214 volatile jint _lock_count; 215 216 // not_entrant method removal. Each mark_sweep pass will update 217 // this mark to current sweep invocation count if it is seen on the 218 // stack. An not_entrant method can be removed when there are no 219 // more activations, i.e., when the _stack_traversal_mark is less than 220 // current sweep traversal index. 221 long _stack_traversal_mark; 222 223 // The _hotness_counter indicates the hotness of a method. The higher 224 // the value the hotter the method. The hotness counter of a nmethod is 225 // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method 226 // is active while stack scanning (mark_active_nmethods()). The hotness 227 // counter is decreased (by 1) while sweeping. 228 int _hotness_counter; 229 230 ExceptionCache *_exception_cache; 231 PcDescCache _pc_desc_cache; 232 233 // These are used for compiled synchronized native methods to 234 // locate the owner and stack slot for the BasicLock so that we can 235 // properly revoke the bias of the owner if necessary. They are 236 // needed because there is no debug information for compiled native 237 // wrappers and the oop maps are insufficient to allow 238 // frame::retrieve_receiver() to work. Currently they are expected 239 // to be byte offsets from the Java stack pointer for maximum code 240 // sharing between platforms. Note that currently biased locking 241 // will never cause Class instances to be biased but this code 242 // handles the static synchronized case as well. 243 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver 244 // for non-static native wrapper frames. 245 ByteSize _native_receiver_sp_offset; 246 ByteSize _native_basic_lock_sp_offset; 247 248 friend class nmethodLocker; 249 250 // For native wrappers 251 nmethod(Method* method, 252 int nmethod_size, 253 int compile_id, 254 CodeOffsets* offsets, 255 CodeBuffer *code_buffer, 256 int frame_size, 257 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ 258 ByteSize basic_lock_sp_offset, /* synchronized natives only */ 259 OopMapSet* oop_maps); 260 261 // Creation support 262 nmethod(Method* method, 263 int nmethod_size, 264 int compile_id, 265 int entry_bci, 266 CodeOffsets* offsets, 267 int orig_pc_offset, 268 DebugInformationRecorder *recorder, 269 Dependencies* dependencies, 270 CodeBuffer *code_buffer, 271 int frame_size, 272 OopMapSet* oop_maps, 273 ExceptionHandlerTable* handler_table, 274 ImplicitExceptionTable* nul_chk_table, 275 AbstractCompiler* compiler, 276 int comp_level); 277 278 // helper methods 279 void* operator new(size_t size, int nmethod_size, int comp_level) throw(); 280 281 const char* reloc_string_for(u_char* begin, u_char* end); 282 // Returns true if this thread changed the state of the nmethod or 283 // false if another thread performed the transition. 284 bool make_not_entrant_or_zombie(unsigned int state); 285 void inc_decompile_count(); 286 287 // Used to manipulate the exception cache 288 void add_exception_cache_entry(ExceptionCache* new_entry); 289 ExceptionCache* exception_cache_entry_for_exception(Handle exception); 290 291 // Inform external interfaces that a compiled method has been unloaded 292 void post_compiled_method_unload(); 293 294 // Initailize fields to their default values 295 void init_defaults(); 296 297 public: 298 // create nmethod with entry_bci 299 static nmethod* new_nmethod(methodHandle method, 300 int compile_id, 301 int entry_bci, 302 CodeOffsets* offsets, 303 int orig_pc_offset, 304 DebugInformationRecorder* recorder, 305 Dependencies* dependencies, 306 CodeBuffer *code_buffer, 307 int frame_size, 308 OopMapSet* oop_maps, 309 ExceptionHandlerTable* handler_table, 310 ImplicitExceptionTable* nul_chk_table, 311 AbstractCompiler* compiler, 312 int comp_level); 313 314 static nmethod* new_native_nmethod(methodHandle method, 315 int compile_id, 316 CodeBuffer *code_buffer, 317 int vep_offset, 318 int frame_complete, 319 int frame_size, 320 ByteSize receiver_sp_offset, 321 ByteSize basic_lock_sp_offset, 322 OopMapSet* oop_maps); 323 324 // accessors 325 Method* method() const { return _method; } 326 AbstractCompiler* compiler() const { return _compiler; } 327 328 // type info 329 bool is_nmethod() const { return true; } 330 bool is_java_method() const { return !method()->is_native(); } 331 bool is_native_method() const { return method()->is_native(); } 332 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } 333 334 bool is_compiled_by_c1() const; 335 bool is_compiled_by_c2() const; 336 bool is_compiled_by_shark() const; 337 338 // boundaries for different parts 339 address consts_begin () const { return header_begin() + _consts_offset ; } 340 address consts_end () const { return header_begin() + code_offset() ; } 341 address insts_begin () const { return header_begin() + code_offset() ; } 342 address insts_end () const { return header_begin() + _stub_offset ; } 343 address stub_begin () const { return header_begin() + _stub_offset ; } 344 address stub_end () const { return header_begin() + _oops_offset ; } 345 address exception_begin () const { return header_begin() + _exception_offset ; } 346 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } 347 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } 348 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 349 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 350 oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; } 351 352 Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; } 353 Metadata** metadata_end () const { return (Metadata**) (header_begin() + _scopes_data_offset) ; } 354 355 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } 356 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 357 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 358 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 359 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 360 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 361 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 362 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 363 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 364 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 365 366 // Sizes 367 int consts_size () const { return consts_end () - consts_begin (); } 368 int insts_size () const { return insts_end () - insts_begin (); } 369 int stub_size () const { return stub_end () - stub_begin (); } 370 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 371 int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); } 372 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } 373 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } 374 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 375 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } 376 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } 377 378 int total_size () const; 379 380 void dec_hotness_counter() { _hotness_counter--; } 381 void set_hotness_counter(int val) { _hotness_counter = val; } 382 int hotness_counter() const { return _hotness_counter; } 383 384 // Containment 385 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } 386 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); } 387 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } 388 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 389 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); } 390 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 391 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 392 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } 393 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } 394 395 // entry points 396 address entry_point() const { return _entry_point; } // normal entry point 397 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct 398 399 enum { in_use = 0, // executable nmethod 400 not_entrant = 1, // marked for deoptimization but activations may still exist, 401 // will be transformed to zombie when all activations are gone 402 zombie = 2, // no activations exist, nmethod is ready for purge 403 unloaded = 3 }; // there should be no activations, should not be called, 404 // will be transformed to zombie immediately 405 406 // flag accessing and manipulation 407 bool is_in_use() const { return _state == in_use; } 408 bool is_alive() const { return _state == in_use || _state == not_entrant; } 409 bool is_not_entrant() const { return _state == not_entrant; } 410 bool is_zombie() const { return _state == zombie; } 411 bool is_unloaded() const { return _state == unloaded; } 412 413 #if INCLUDE_RTM_OPT 414 // rtm state accessing and manipulating 415 RTMState rtm_state() const { return _rtm_state; } 416 void set_rtm_state(RTMState state) { _rtm_state = state; } 417 #endif 418 419 // Make the nmethod non entrant. The nmethod will continue to be 420 // alive. It is used when an uncommon trap happens. Returns true 421 // if this thread changed the state of the nmethod or false if 422 // another thread performed the transition. 423 bool make_not_entrant() { 424 assert(!method()->is_method_handle_intrinsic(), "Cannot make MH intrinsic not entrant"); 425 return make_not_entrant_or_zombie(not_entrant); 426 } 427 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 428 429 // used by jvmti to track if the unload event has been reported 430 bool unload_reported() { return _unload_reported; } 431 void set_unload_reported() { _unload_reported = true; } 432 433 void set_unloading_next(nmethod* next) { _unloading_next = next; } 434 nmethod* unloading_next() { return _unloading_next; } 435 436 static unsigned char global_unloading_clock() { return _global_unloading_clock; } 437 static void increase_unloading_clock(); 438 439 void set_unloading_clock(unsigned char unloading_clock); 440 unsigned char unloading_clock(); 441 442 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; } 443 void mark_for_deoptimization() { _marked_for_deoptimization = true; } 444 445 void make_unloaded(BoolObjectClosure* is_alive, oop cause); 446 447 bool has_dependencies() { return dependencies_size() != 0; } 448 void flush_dependencies(BoolObjectClosure* is_alive); 449 bool has_flushed_dependencies() { return _has_flushed_dependencies; } 450 void set_has_flushed_dependencies() { 451 assert(!has_flushed_dependencies(), "should only happen once"); 452 _has_flushed_dependencies = 1; 453 } 454 455 bool is_marked_for_reclamation() const { return _marked_for_reclamation; } 456 void mark_for_reclamation() { _marked_for_reclamation = 1; } 457 458 bool has_unsafe_access() const { return _has_unsafe_access; } 459 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; } 460 461 bool has_method_handle_invokes() const { return _has_method_handle_invokes; } 462 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; } 463 464 bool is_lazy_critical_native() const { return _lazy_critical_native; } 465 void set_lazy_critical_native(bool z) { _lazy_critical_native = z; } 466 467 bool has_wide_vectors() const { return _has_wide_vectors; } 468 void set_has_wide_vectors(bool z) { _has_wide_vectors = z; } 469 470 int comp_level() const { return _comp_level; } 471 472 // Support for oops in scopes and relocs: 473 // Note: index 0 is reserved for null. 474 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } 475 oop* oop_addr_at(int index) const { // for GC 476 // relocation indexes are biased by 1 (because 0 is reserved) 477 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); 478 assert(!_oops_are_stale, "oops are stale"); 479 return &oops_begin()[index - 1]; 480 } 481 482 // Support for meta data in scopes and relocs: 483 // Note: index 0 is reserved for null. 484 Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); } 485 Metadata** metadata_addr_at(int index) const { // for GC 486 // relocation indexes are biased by 1 (because 0 is reserved) 487 assert(index > 0 && index <= metadata_size(), "must be a valid non-zero index"); 488 return &metadata_begin()[index - 1]; 489 } 490 491 void copy_values(GrowableArray<jobject>* oops); 492 void copy_values(GrowableArray<Metadata*>* metadata); 493 494 // Relocation support 495 private: 496 void fix_oop_relocations(address begin, address end, bool initialize_immediates); 497 inline void initialize_immediate_oop(oop* dest, jobject handle); 498 499 public: 500 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } 501 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } 502 void verify_oop_relocations(); 503 504 bool is_at_poll_return(address pc); 505 bool is_at_poll_or_poll_return(address pc); 506 507 // Scavengable oop support 508 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } 509 protected: 510 enum { sl_on_list = 0x01, sl_marked = 0x10 }; 511 void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; } 512 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } 513 // assertion-checking and pruning logic uses the bits of _scavenge_root_state 514 #ifndef PRODUCT 515 void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; } 516 void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; } 517 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; } 518 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. 519 #endif //PRODUCT 520 nmethod* scavenge_root_link() const { return _scavenge_root_link; } 521 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } 522 523 public: 524 525 // Sweeper support 526 long stack_traversal_mark() { return _stack_traversal_mark; } 527 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 528 529 // Exception cache support 530 ExceptionCache* exception_cache() const { return _exception_cache; } 531 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } 532 address handler_for_exception_and_pc(Handle exception, address pc); 533 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); 534 void clean_exception_cache(BoolObjectClosure* is_alive); 535 536 // implicit exceptions support 537 address continuation_for_implicit_exception(address pc); 538 539 // On-stack replacement support 540 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; } 541 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; } 542 void invalidate_osr_method(); 543 nmethod* osr_link() const { return _osr_link; } 544 void set_osr_link(nmethod *n) { _osr_link = n; } 545 546 // tells whether frames described by this nmethod can be deoptimized 547 // note: native wrappers cannot be deoptimized. 548 bool can_be_deoptimized() const { return is_java_method(); } 549 550 // Inline cache support 551 void clear_inline_caches(); 552 void clear_ic_stubs(); 553 void cleanup_inline_caches(); 554 bool inlinecache_check_contains(address addr) const { 555 return (addr >= code_begin() && addr < verified_entry_point()); 556 } 557 558 // Verify calls to dead methods have been cleaned. 559 void verify_clean_inline_caches(); 560 // Verify and count cached icholder relocations. 561 int verify_icholder_relocations(); 562 // Check that all metadata is still alive 563 void verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive); 564 565 // unlink and deallocate this nmethod 566 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not 567 // expected to use any other private methods/data in this class. 568 569 protected: 570 void flush(); 571 572 public: 573 // When true is returned, it is unsafe to remove this nmethod even if 574 // it is a zombie, since the VM or the ServiceThread might still be 575 // using it. 576 bool is_locked_by_vm() const { return _lock_count >0; } 577 578 // See comment at definition of _last_seen_on_stack 579 void mark_as_seen_on_stack(); 580 bool can_convert_to_zombie(); 581 582 // Evolution support. We make old (discarded) compiled methods point to new Method*s. 583 void set_method(Method* method) { _method = method; } 584 585 // GC support 586 void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred); 587 // The parallel versions are used by G1. 588 bool do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred); 589 void do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred); 590 591 private: 592 // Unload a nmethod if the *root object is dead. 593 bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred); 594 bool unload_if_dead_at(RelocIterator *iter_at_oop, BoolObjectClosure* is_alive, bool unloading_occurred); 595 596 public: 597 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, 598 OopClosure* f); 599 void oops_do(OopClosure* f) { oops_do(f, false); } 600 void oops_do(OopClosure* f, bool allow_zombie); 601 bool detect_scavenge_root_oops(); 602 void verify_scavenge_root_oops() PRODUCT_RETURN; 603 604 bool test_set_oops_do_mark(); 605 static void oops_do_marking_prologue(); 606 static void oops_do_marking_epilogue(); 607 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } 608 bool test_oops_do_mark() { return _oops_do_mark_link != NULL; } 609 610 // ScopeDesc for an instruction 611 ScopeDesc* scope_desc_at(address pc); 612 613 private: 614 ScopeDesc* scope_desc_in(address begin, address end); 615 616 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } 617 618 PcDesc* find_pc_desc_internal(address pc, bool approximate); 619 620 PcDesc* find_pc_desc(address pc, bool approximate) { 621 PcDesc* desc = _pc_desc_cache.last_pc_desc(); 622 if (desc != NULL && desc->pc_offset() == pc - code_begin()) { 623 return desc; 624 } 625 return find_pc_desc_internal(pc, approximate); 626 } 627 628 public: 629 // ScopeDesc retrieval operation 630 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } 631 // pc_desc_near returns the first PcDesc at or after the givne pc. 632 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } 633 634 public: 635 // copying of debugging information 636 void copy_scopes_pcs(PcDesc* pcs, int count); 637 void copy_scopes_data(address buffer, int size); 638 639 // Deopt 640 // Return true is the PC is one would expect if the frame is being deopted. 641 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); } 642 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); } 643 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); } 644 // Accessor/mutator for the original pc of a frame before a frame was deopted. 645 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } 646 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } 647 648 static address get_deopt_original_pc(const frame* fr); 649 650 // MethodHandle 651 bool is_method_handle_return(address return_pc); 652 653 // jvmti support: 654 void post_compiled_method_load_event(); 655 jmethodID get_and_cache_jmethod_id(); 656 657 // verify operations 658 void verify(); 659 void verify_scopes(); 660 void verify_interrupt_point(address interrupt_point); 661 662 // printing support 663 void print() const; 664 void print_code(); 665 void print_relocations() PRODUCT_RETURN; 666 void print_pcs() PRODUCT_RETURN; 667 void print_scopes() PRODUCT_RETURN; 668 void print_dependencies() PRODUCT_RETURN; 669 void print_value_on(outputStream* st) const PRODUCT_RETURN; 670 void print_calls(outputStream* st) PRODUCT_RETURN; 671 void print_handler_table() PRODUCT_RETURN; 672 void print_nul_chk_table() PRODUCT_RETURN; 673 void print_nmethod(bool print_code); 674 675 // need to re-define this from CodeBlob else the overload hides it 676 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } 677 void print_on(outputStream* st, const char* msg) const; 678 679 // Logging 680 void log_identity(xmlStream* log) const; 681 void log_new_nmethod() const; 682 void log_state_change() const; 683 684 // Prints block-level comments, including nmethod specific block labels: 685 virtual void print_block_comment(outputStream* stream, address block_begin) const { 686 print_nmethod_labels(stream, block_begin); 687 CodeBlob::print_block_comment(stream, block_begin); 688 } 689 void print_nmethod_labels(outputStream* stream, address block_begin) const; 690 691 // Prints a comment for one native instruction (reloc info, pc desc) 692 void print_code_comment_on(outputStream* st, int column, address begin, address end); 693 static void print_statistics() PRODUCT_RETURN; 694 695 // Compiler task identification. Note that all OSR methods 696 // are numbered in an independent sequence if CICountOSR is true, 697 // and native method wrappers are also numbered independently if 698 // CICountNative is true. 699 int compile_id() const { return _compile_id; } 700 const char* compile_kind() const; 701 702 // tells if any of this method's dependencies have been invalidated 703 // (this is expensive!) 704 static void check_all_dependencies(DepChange& changes); 705 706 // tells if this compiled method is dependent on the given changes, 707 // and the changes have invalidated it 708 bool check_dependency_on(DepChange& changes); 709 710 // Evolution support. Tells if this compiled method is dependent on any of 711 // methods m() of class dependee, such that if m() in dependee is replaced, 712 // this compiled method will have to be deoptimized. 713 bool is_evol_dependent_on(Klass* dependee); 714 715 // Fast breakpoint support. Tells if this compiled method is 716 // dependent on the given method. Returns true if this nmethod 717 // corresponds to the given method as well. 718 bool is_dependent_on_method(Method* dependee); 719 720 // is it ok to patch at address? 721 bool is_patchable_at(address instr_address); 722 723 // UseBiasedLocking support 724 ByteSize native_receiver_sp_offset() { 725 return _native_receiver_sp_offset; 726 } 727 ByteSize native_basic_lock_sp_offset() { 728 return _native_basic_lock_sp_offset; 729 } 730 731 // support for code generation 732 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 733 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 734 static int state_offset() { return offset_of(nmethod, _state); } 735 736 // RedefineClasses support. Mark metadata in nmethods as on_stack so that 737 // redefine classes doesn't purge it. 738 static void mark_on_stack(nmethod* nm) { 739 nm->metadata_do(Metadata::mark_on_stack); 740 } 741 void metadata_do(void f(Metadata*)); 742 }; 743 744 // Locks an nmethod so its code will not get removed and it will not 745 // be made into a zombie, even if it is a not_entrant method. After the 746 // nmethod becomes a zombie, if CompiledMethodUnload event processing 747 // needs to be done, then lock_nmethod() is used directly to keep the 748 // generated code from being reused too early. 749 class nmethodLocker : public StackObj { 750 nmethod* _nm; 751 752 public: 753 754 // note: nm can be NULL 755 // Only JvmtiDeferredEvent::compiled_method_unload_event() 756 // should pass zombie_ok == true. 757 static void lock_nmethod(nmethod* nm, bool zombie_ok = false); 758 static void unlock_nmethod(nmethod* nm); // (ditto) 759 760 nmethodLocker(address pc); // derive nm from pc 761 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 762 nmethodLocker() { _nm = NULL; } 763 ~nmethodLocker() { unlock_nmethod(_nm); } 764 765 nmethod* code() { return _nm; } 766 void set_code(nmethod* new_nm) { 767 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. 768 _nm = new_nm; 769 lock_nmethod(_nm); 770 } 771 }; 772 773 #endif // SHARE_VM_CODE_NMETHOD_HPP