1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_CODE_NMETHOD_HPP 26 #define SHARE_CODE_NMETHOD_HPP 27 28 #include "code/compiledMethod.hpp" 29 30 class DepChange; 31 class DirectiveSet; 32 class DebugInformationRecorder; 33 34 // nmethods (native methods) are the compiled code versions of Java methods. 35 // 36 // An nmethod contains: 37 // - header (the nmethod structure) 38 // [Relocation] 39 // - relocation information 40 // - constant part (doubles, longs and floats used in nmethod) 41 // - oop table 42 // [Code] 43 // - code body 44 // - exception handler 45 // - stub code 46 // [Debugging information] 47 // - oop array 48 // - data array 49 // - pcs 50 // [Exception handler table] 51 // - handler entry point array 52 // [Implicit Null Pointer exception table] 53 // - implicit null table array 54 // [Speculations] 55 // - encoded speculations array 56 // [JVMCINMethodData] 57 // - meta data for JVMCI compiled nmethod 58 59 #if INCLUDE_JVMCI 60 class FailedSpeculation; 61 class JVMCINMethodData; 62 #endif 63 64 class nmethod : public CompiledMethod { 65 friend class VMStructs; 66 friend class JVMCIVMStructs; 67 friend class NMethodSweeper; 68 friend class CodeCache; // scavengable oops 69 friend class JVMCINMethodData; 70 private: 71 72 // Shared fields for all nmethod's 73 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method 74 jmethodID _jmethod_id; // Cache of method()->jmethod_id() 75 76 // To support simple linked-list chaining of nmethods: 77 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head 78 79 static nmethod* volatile _oops_do_mark_nmethods; 80 nmethod* volatile _oops_do_mark_link; 81 82 // offsets for entry points 83 address _entry_point; // entry point with class check 84 address _verified_entry_point; // entry point without class check 85 address _osr_entry_point; // entry point for on stack replacement 86 87 // Offsets for different nmethod parts 88 int _exception_offset; 89 // Offset of the unwind handler if it exists 90 int _unwind_handler_offset; 91 92 int _consts_offset; 93 int _stub_offset; 94 int _oops_offset; // offset to where embedded oop table begins (inside data) 95 int _metadata_offset; // embedded meta data table 96 int _scopes_data_offset; 97 int _scopes_pcs_offset; 98 int _dependencies_offset; 99 int _handler_table_offset; 100 int _nul_chk_table_offset; 101 #if INCLUDE_JVMCI 102 int _speculations_offset; 103 int _jvmci_data_offset; 104 #endif 105 int _nmethod_end_offset; 106 107 int code_offset() const { return (address) code_begin() - header_begin(); } 108 109 // location in frame (offset for sp) that deopt can store the original 110 // pc during a deopt. 111 int _orig_pc_offset; 112 113 int _compile_id; // which compilation made this nmethod 114 int _comp_level; // compilation level 115 116 // protected by CodeCache_lock 117 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) 118 119 // used by jvmti to track if an unload event has been posted for this nmethod. 120 bool _unload_reported; 121 122 // Protected by Patching_lock 123 volatile signed char _state; // {not_installed, in_use, not_entrant, zombie, unloaded} 124 125 #ifdef ASSERT 126 bool _oops_are_stale; // indicates that it's no longer safe to access oops section 127 #endif 128 129 #if INCLUDE_RTM_OPT 130 // RTM state at compile time. Used during deoptimization to decide 131 // whether to restart collecting RTM locking abort statistic again. 132 RTMState _rtm_state; 133 #endif 134 135 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed 136 // and is not made into a zombie. However, once the nmethod is made into 137 // a zombie, it will be locked one final time if CompiledMethodUnload 138 // event processing needs to be done. 139 volatile jint _lock_count; 140 141 // not_entrant method removal. Each mark_sweep pass will update 142 // this mark to current sweep invocation count if it is seen on the 143 // stack. An not_entrant method can be removed when there are no 144 // more activations, i.e., when the _stack_traversal_mark is less than 145 // current sweep traversal index. 146 volatile long _stack_traversal_mark; 147 148 // The _hotness_counter indicates the hotness of a method. The higher 149 // the value the hotter the method. The hotness counter of a nmethod is 150 // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method 151 // is active while stack scanning (mark_active_nmethods()). The hotness 152 // counter is decreased (by 1) while sweeping. 153 int _hotness_counter; 154 155 // Local state used to keep track of whether unloading is happening or not 156 volatile uint8_t _is_unloading_state; 157 158 // These are used for compiled synchronized native methods to 159 // locate the owner and stack slot for the BasicLock so that we can 160 // properly revoke the bias of the owner if necessary. They are 161 // needed because there is no debug information for compiled native 162 // wrappers and the oop maps are insufficient to allow 163 // frame::retrieve_receiver() to work. Currently they are expected 164 // to be byte offsets from the Java stack pointer for maximum code 165 // sharing between platforms. Note that currently biased locking 166 // will never cause Class instances to be biased but this code 167 // handles the static synchronized case as well. 168 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver 169 // for non-static native wrapper frames. 170 ByteSize _native_receiver_sp_offset; 171 ByteSize _native_basic_lock_sp_offset; 172 173 friend class nmethodLocker; 174 175 // For native wrappers 176 nmethod(Method* method, 177 CompilerType type, 178 int nmethod_size, 179 int compile_id, 180 CodeOffsets* offsets, 181 CodeBuffer *code_buffer, 182 int frame_size, 183 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ 184 ByteSize basic_lock_sp_offset, /* synchronized natives only */ 185 OopMapSet* oop_maps); 186 187 // Creation support 188 nmethod(Method* method, 189 CompilerType type, 190 int nmethod_size, 191 int compile_id, 192 int entry_bci, 193 CodeOffsets* offsets, 194 int orig_pc_offset, 195 DebugInformationRecorder *recorder, 196 Dependencies* dependencies, 197 CodeBuffer *code_buffer, 198 int frame_size, 199 OopMapSet* oop_maps, 200 ExceptionHandlerTable* handler_table, 201 ImplicitExceptionTable* nul_chk_table, 202 AbstractCompiler* compiler, 203 int comp_level 204 #if INCLUDE_JVMCI 205 , char* speculations, 206 int speculations_len, 207 int jvmci_data_size 208 #endif 209 ); 210 211 // helper methods 212 void* operator new(size_t size, int nmethod_size, int comp_level) throw(); 213 214 const char* reloc_string_for(u_char* begin, u_char* end); 215 // Returns true if this thread changed the state of the nmethod or 216 // false if another thread performed the transition. 217 bool make_not_entrant_or_zombie(int state); 218 bool make_entrant() { Unimplemented(); return false; } 219 void inc_decompile_count(); 220 221 // Inform external interfaces that a compiled method has been unloaded 222 void post_compiled_method_unload(); 223 224 // Initailize fields to their default values 225 void init_defaults(); 226 227 // Offsets 228 int content_offset() const { return content_begin() - header_begin(); } 229 int data_offset() const { return _data_offset; } 230 231 address header_end() const { return (address) header_begin() + header_size(); } 232 233 public: 234 // create nmethod with entry_bci 235 static nmethod* new_nmethod(const methodHandle& method, 236 int compile_id, 237 int entry_bci, 238 CodeOffsets* offsets, 239 int orig_pc_offset, 240 DebugInformationRecorder* recorder, 241 Dependencies* dependencies, 242 CodeBuffer *code_buffer, 243 int frame_size, 244 OopMapSet* oop_maps, 245 ExceptionHandlerTable* handler_table, 246 ImplicitExceptionTable* nul_chk_table, 247 AbstractCompiler* compiler, 248 int comp_level 249 #if INCLUDE_JVMCI 250 , char* speculations = NULL, 251 int speculations_len = 0, 252 int nmethod_mirror_index = -1, 253 const char* nmethod_mirror_name = NULL, 254 FailedSpeculation** failed_speculations = NULL 255 #endif 256 ); 257 258 // Only used for unit tests. 259 nmethod() 260 : CompiledMethod(), 261 _is_unloading_state(0), 262 _native_receiver_sp_offset(in_ByteSize(-1)), 263 _native_basic_lock_sp_offset(in_ByteSize(-1)) {} 264 265 266 static nmethod* new_native_nmethod(const methodHandle& method, 267 int compile_id, 268 CodeBuffer *code_buffer, 269 int vep_offset, 270 int frame_complete, 271 int frame_size, 272 ByteSize receiver_sp_offset, 273 ByteSize basic_lock_sp_offset, 274 OopMapSet* oop_maps); 275 276 // type info 277 bool is_nmethod() const { return true; } 278 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } 279 280 // boundaries for different parts 281 address consts_begin () const { return header_begin() + _consts_offset ; } 282 address consts_end () const { return code_begin() ; } 283 address stub_begin () const { return header_begin() + _stub_offset ; } 284 address stub_end () const { return header_begin() + _oops_offset ; } 285 address exception_begin () const { return header_begin() + _exception_offset ; } 286 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 287 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 288 oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; } 289 290 Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; } 291 Metadata** metadata_end () const { return (Metadata**) _scopes_data_begin; } 292 293 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 294 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 295 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 296 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 297 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 298 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 299 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 300 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 301 #if INCLUDE_JVMCI 302 address nul_chk_table_end () const { return header_begin() + _speculations_offset ; } 303 address speculations_begin () const { return header_begin() + _speculations_offset ; } 304 address speculations_end () const { return header_begin() + _jvmci_data_offset ; } 305 address jvmci_data_begin () const { return header_begin() + _jvmci_data_offset ; } 306 address jvmci_data_end () const { return header_begin() + _nmethod_end_offset ; } 307 #else 308 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 309 #endif 310 311 // Sizes 312 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 313 int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); } 314 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 315 #if INCLUDE_JVMCI 316 int speculations_size () const { return speculations_end () - speculations_begin (); } 317 int jvmci_data_size () const { return jvmci_data_end () - jvmci_data_begin (); } 318 #endif 319 320 int oops_count() const { assert(oops_size() % oopSize == 0, ""); return (oops_size() / oopSize) + 1; } 321 int metadata_count() const { assert(metadata_size() % wordSize == 0, ""); return (metadata_size() / wordSize) + 1; } 322 323 int total_size () const; 324 325 void dec_hotness_counter() { _hotness_counter--; } 326 void set_hotness_counter(int val) { _hotness_counter = val; } 327 int hotness_counter() const { return _hotness_counter; } 328 329 // Containment 330 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 331 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); } 332 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 333 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 334 335 // entry points 336 address entry_point() const { return _entry_point; } // normal entry point 337 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct 338 339 // flag accessing and manipulation 340 bool is_not_installed() const { return _state == not_installed; } 341 bool is_in_use() const { return _state <= in_use; } 342 bool is_alive() const { return _state < zombie; } 343 bool is_not_entrant() const { return _state == not_entrant; } 344 bool is_zombie() const { return _state == zombie; } 345 bool is_unloaded() const { return _state == unloaded; } 346 347 void clear_unloading_state(); 348 virtual bool is_unloading(); 349 virtual void do_unloading(bool unloading_occurred); 350 351 #if INCLUDE_RTM_OPT 352 // rtm state accessing and manipulating 353 RTMState rtm_state() const { return _rtm_state; } 354 void set_rtm_state(RTMState state) { _rtm_state = state; } 355 #endif 356 357 void make_in_use() { _state = in_use; } 358 // Make the nmethod non entrant. The nmethod will continue to be 359 // alive. It is used when an uncommon trap happens. Returns true 360 // if this thread changed the state of the nmethod or false if 361 // another thread performed the transition. 362 bool make_not_entrant() { 363 assert(!method()->is_method_handle_intrinsic(), "Cannot make MH intrinsic not entrant"); 364 return make_not_entrant_or_zombie(not_entrant); 365 } 366 bool make_not_used() { return make_not_entrant(); } 367 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 368 369 // used by jvmti to track if the unload event has been reported 370 bool unload_reported() { return _unload_reported; } 371 void set_unload_reported() { _unload_reported = true; } 372 373 int get_state() const { 374 return _state; 375 } 376 377 void make_unloaded(); 378 379 bool has_dependencies() { return dependencies_size() != 0; } 380 void print_dependencies() PRODUCT_RETURN; 381 void flush_dependencies(bool delete_immediately); 382 bool has_flushed_dependencies() { return _has_flushed_dependencies; } 383 void set_has_flushed_dependencies() { 384 assert(!has_flushed_dependencies(), "should only happen once"); 385 _has_flushed_dependencies = 1; 386 } 387 388 int comp_level() const { return _comp_level; } 389 390 void unlink_from_method(bool acquire_lock); 391 392 // Support for oops in scopes and relocs: 393 // Note: index 0 is reserved for null. 394 oop oop_at(int index) const; 395 oop* oop_addr_at(int index) const { // for GC 396 // relocation indexes are biased by 1 (because 0 is reserved) 397 assert(index > 0 && index <= oops_count(), "must be a valid non-zero index"); 398 assert(!_oops_are_stale, "oops are stale"); 399 return &oops_begin()[index - 1]; 400 } 401 402 // Support for meta data in scopes and relocs: 403 // Note: index 0 is reserved for null. 404 Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); } 405 Metadata** metadata_addr_at(int index) const { // for GC 406 // relocation indexes are biased by 1 (because 0 is reserved) 407 assert(index > 0 && index <= metadata_count(), "must be a valid non-zero index"); 408 return &metadata_begin()[index - 1]; 409 } 410 411 void copy_values(GrowableArray<jobject>* oops); 412 void copy_values(GrowableArray<Metadata*>* metadata); 413 414 // Relocation support 415 private: 416 void fix_oop_relocations(address begin, address end, bool initialize_immediates); 417 inline void initialize_immediate_oop(oop* dest, jobject handle); 418 419 public: 420 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } 421 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } 422 423 // Sweeper support 424 long stack_traversal_mark() { return _stack_traversal_mark; } 425 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 426 427 // implicit exceptions support 428 address continuation_for_implicit_exception(address pc); 429 430 // On-stack replacement support 431 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; } 432 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; } 433 void invalidate_osr_method(); 434 nmethod* osr_link() const { return _osr_link; } 435 void set_osr_link(nmethod *n) { _osr_link = n; } 436 437 // Verify calls to dead methods have been cleaned. 438 void verify_clean_inline_caches(); 439 440 // unlink and deallocate this nmethod 441 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not 442 // expected to use any other private methods/data in this class. 443 444 protected: 445 void flush(); 446 447 public: 448 // When true is returned, it is unsafe to remove this nmethod even if 449 // it is a zombie, since the VM or the ServiceThread might still be 450 // using it. 451 bool is_locked_by_vm() const { return _lock_count >0; } 452 453 // See comment at definition of _last_seen_on_stack 454 void mark_as_seen_on_stack(); 455 bool can_convert_to_zombie(); 456 457 // Evolution support. We make old (discarded) compiled methods point to new Method*s. 458 void set_method(Method* method) { _method = method; } 459 460 #if INCLUDE_JVMCI 461 // Gets the JVMCI name of this nmethod. 462 const char* jvmci_name(); 463 464 // Records the pending failed speculation in the 465 // JVMCI speculation log associated with this nmethod. 466 void update_speculation(JavaThread* thread); 467 468 // Gets the data specific to a JVMCI compiled method. 469 // This returns a non-NULL value iff this nmethod was 470 // compiled by the JVMCI compiler. 471 JVMCINMethodData* jvmci_nmethod_data() const { 472 return jvmci_data_size() == 0 ? NULL : (JVMCINMethodData*) jvmci_data_begin(); 473 } 474 #endif 475 476 public: 477 void oops_do(OopClosure* f) { oops_do(f, false); } 478 void oops_do(OopClosure* f, bool allow_zombie); 479 480 bool test_set_oops_do_mark(); 481 static void oops_do_marking_prologue(); 482 static void oops_do_marking_epilogue(); 483 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } 484 bool test_oops_do_mark() { return _oops_do_mark_link != NULL; } 485 486 private: 487 ScopeDesc* scope_desc_in(address begin, address end); 488 489 address* orig_pc_addr(const frame* fr); 490 491 public: 492 // copying of debugging information 493 void copy_scopes_pcs(PcDesc* pcs, int count); 494 void copy_scopes_data(address buffer, int size); 495 496 // Accessor/mutator for the original pc of a frame before a frame was deopted. 497 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } 498 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } 499 500 // jvmti support: 501 void post_compiled_method_load_event(); 502 jmethodID get_and_cache_jmethod_id(); 503 504 // verify operations 505 void verify(); 506 void verify_scopes(); 507 void verify_interrupt_point(address interrupt_point); 508 509 // Disassemble this nmethod with additional debug information, e.g. information about blocks. 510 void decode2(outputStream* st) const; 511 void print_constant_pool(outputStream* st); 512 513 // Avoid hiding of parent's 'decode(outputStream*)' method. 514 void decode(outputStream* st) const { decode2(st); } // just delegate here. 515 516 // printing support 517 void print() const; 518 void print(outputStream* st) const; 519 void print_code(); 520 521 #if defined(SUPPORT_DATA_STRUCTS) 522 // print output in opt build for disassembler library 523 void print_relocations() PRODUCT_RETURN; 524 void print_pcs() { print_pcs_on(tty); } 525 void print_pcs_on(outputStream* st); 526 void print_scopes() { print_scopes_on(tty); } 527 void print_scopes_on(outputStream* st) PRODUCT_RETURN; 528 void print_value_on(outputStream* st) const; 529 void print_handler_table(); 530 void print_nul_chk_table(); 531 void print_recorded_oops(); 532 void print_recorded_metadata(); 533 534 void print_oops(outputStream* st); // oops from the underlying CodeBlob. 535 void print_metadata(outputStream* st); // metadata in metadata pool. 536 #else 537 // void print_pcs() PRODUCT_RETURN; 538 void print_pcs() { return; } 539 #endif 540 541 void print_calls(outputStream* st) PRODUCT_RETURN; 542 static void print_statistics() PRODUCT_RETURN; 543 544 void maybe_print_nmethod(DirectiveSet* directive); 545 void print_nmethod(bool print_code); 546 547 // need to re-define this from CodeBlob else the overload hides it 548 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } 549 void print_on(outputStream* st, const char* msg) const; 550 551 // Logging 552 void log_identity(xmlStream* log) const; 553 void log_new_nmethod() const; 554 void log_state_change() const; 555 556 // Prints block-level comments, including nmethod specific block labels: 557 virtual void print_block_comment(outputStream* stream, address block_begin) const { 558 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 559 print_nmethod_labels(stream, block_begin); 560 CodeBlob::print_block_comment(stream, block_begin); 561 #endif 562 } 563 bool has_block_comment(address block_begin) { 564 return CodeBlob::has_block_comment(block_begin); 565 } 566 void print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels=true) const; 567 const char* nmethod_section_label(address pos) const; 568 569 // returns whether this nmethod has code comments. 570 bool has_code_comment(address begin, address end); 571 // Prints a comment for one native instruction (reloc info, pc desc) 572 void print_code_comment_on(outputStream* st, int column, address begin, address end); 573 574 // Compiler task identification. Note that all OSR methods 575 // are numbered in an independent sequence if CICountOSR is true, 576 // and native method wrappers are also numbered independently if 577 // CICountNative is true. 578 virtual int compile_id() const { return _compile_id; } 579 const char* compile_kind() const; 580 581 // tells if any of this method's dependencies have been invalidated 582 // (this is expensive!) 583 static void check_all_dependencies(DepChange& changes); 584 585 // tells if this compiled method is dependent on the given changes, 586 // and the changes have invalidated it 587 bool check_dependency_on(DepChange& changes); 588 589 // Fast breakpoint support. Tells if this compiled method is 590 // dependent on the given method. Returns true if this nmethod 591 // corresponds to the given method as well. 592 virtual bool is_dependent_on_method(Method* dependee); 593 594 // is it ok to patch at address? 595 bool is_patchable_at(address instr_address); 596 597 // UseBiasedLocking support 598 ByteSize native_receiver_sp_offset() { 599 return _native_receiver_sp_offset; 600 } 601 ByteSize native_basic_lock_sp_offset() { 602 return _native_basic_lock_sp_offset; 603 } 604 605 // support for code generation 606 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 607 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 608 static int state_offset() { return offset_of(nmethod, _state); } 609 610 virtual void metadata_do(MetadataClosure* f); 611 612 NativeCallWrapper* call_wrapper_at(address call) const; 613 NativeCallWrapper* call_wrapper_before(address return_pc) const; 614 address call_instruction_address(address pc) const; 615 616 virtual CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) const; 617 virtual CompiledStaticCall* compiledStaticCall_at(address addr) const; 618 virtual CompiledStaticCall* compiledStaticCall_before(address addr) const; 619 }; 620 621 // Locks an nmethod so its code will not get removed and it will not 622 // be made into a zombie, even if it is a not_entrant method. After the 623 // nmethod becomes a zombie, if CompiledMethodUnload event processing 624 // needs to be done, then lock_nmethod() is used directly to keep the 625 // generated code from being reused too early. 626 class nmethodLocker : public StackObj { 627 CompiledMethod* _nm; 628 629 public: 630 631 // note: nm can be NULL 632 // Only JvmtiDeferredEvent::compiled_method_unload_event() 633 // should pass zombie_ok == true. 634 static void lock_nmethod(CompiledMethod* nm, bool zombie_ok = false); 635 static void unlock_nmethod(CompiledMethod* nm); // (ditto) 636 637 nmethodLocker(address pc); // derive nm from pc 638 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 639 nmethodLocker(CompiledMethod *nm) { 640 _nm = nm; 641 lock(_nm); 642 } 643 644 static void lock(CompiledMethod* method) { 645 if (method == NULL) return; 646 lock_nmethod(method); 647 } 648 649 static void unlock(CompiledMethod* method) { 650 if (method == NULL) return; 651 unlock_nmethod(method); 652 } 653 654 nmethodLocker() { _nm = NULL; } 655 ~nmethodLocker() { 656 unlock(_nm); 657 } 658 659 CompiledMethod* code() { return _nm; } 660 void set_code(CompiledMethod* new_nm) { 661 unlock(_nm); // note: This works even if _nm==new_nm. 662 _nm = new_nm; 663 lock(_nm); 664 } 665 }; 666 667 #endif // SHARE_CODE_NMETHOD_HPP