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 55 class nmethod : public CompiledMethod { 56 friend class VMStructs; 57 friend class JVMCIVMStructs; 58 friend class NMethodSweeper; 59 friend class CodeCache; // scavengable oops 60 private: 61 62 // Shared fields for all nmethod's 63 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method 64 jmethodID _jmethod_id; // Cache of method()->jmethod_id() 65 66 #if INCLUDE_JVMCI 67 // A weak reference to an InstalledCode object associated with 68 // this nmethod. 69 jweak _jvmci_installed_code; 70 71 // A weak reference to a SpeculationLog object associated with 72 // this nmethod. 73 jweak _speculation_log; 74 75 // Determines whether this nmethod is unloaded when the 76 // referent in _jvmci_installed_code is cleared. This 77 // will be false if the referent is initialized to a 78 // HotSpotNMethod object whose isDefault field is true. 79 // That is, installed code other than a "default" 80 // HotSpotNMethod causes nmethod unloading. 81 // This field is ignored once _jvmci_installed_code is NULL. 82 bool _jvmci_installed_code_triggers_invalidation; 83 #endif 84 85 // To support simple linked-list chaining of nmethods: 86 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head 87 88 static nmethod* volatile _oops_do_mark_nmethods; 89 nmethod* volatile _oops_do_mark_link; 90 91 // offsets for entry points 92 address _entry_point; // entry point with class check 93 address _verified_entry_point; // entry point without class check 94 address _verified_value_entry_point; // value type entry point (unpack all value args) without class check 95 address _verified_value_ro_entry_point; // value type entry point (unpack receiver only) without class check 96 address _osr_entry_point; // entry point for on stack replacement 97 98 // Offsets for different nmethod parts 99 int _exception_offset; 100 // Offset of the unwind handler if it exists 101 int _unwind_handler_offset; 102 103 int _consts_offset; 104 int _stub_offset; 105 int _oops_offset; // offset to where embedded oop table begins (inside data) 106 int _metadata_offset; // embedded meta data table 107 int _scopes_data_offset; 108 int _scopes_pcs_offset; 109 int _dependencies_offset; 110 int _handler_table_offset; 111 int _nul_chk_table_offset; 112 int _nmethod_end_offset; 113 114 int code_offset() const { return (address) code_begin() - header_begin(); } 115 116 // location in frame (offset for sp) that deopt can store the original 117 // pc during a deopt. 118 int _orig_pc_offset; 119 120 int _compile_id; // which compilation made this nmethod 121 int _comp_level; // compilation level 122 123 // protected by CodeCache_lock 124 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) 125 126 // used by jvmti to track if an unload event has been posted for this nmethod. 127 bool _unload_reported; 128 129 // Protected by Patching_lock 130 volatile signed char _state; // {not_installed, in_use, not_entrant, zombie, unloaded} 131 132 #ifdef ASSERT 133 bool _oops_are_stale; // indicates that it's no longer safe to access oops section 134 #endif 135 136 jbyte _scavenge_root_state; 137 138 #if INCLUDE_RTM_OPT 139 // RTM state at compile time. Used during deoptimization to decide 140 // whether to restart collecting RTM locking abort statistic again. 141 RTMState _rtm_state; 142 #endif 143 144 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed 145 // and is not made into a zombie. However, once the nmethod is made into 146 // a zombie, it will be locked one final time if CompiledMethodUnload 147 // event processing needs to be done. 148 volatile jint _lock_count; 149 150 // not_entrant method removal. Each mark_sweep pass will update 151 // this mark to current sweep invocation count if it is seen on the 152 // stack. An not_entrant method can be removed when there are no 153 // more activations, i.e., when the _stack_traversal_mark is less than 154 // current sweep traversal index. 155 volatile long _stack_traversal_mark; 156 157 // The _hotness_counter indicates the hotness of a method. The higher 158 // the value the hotter the method. The hotness counter of a nmethod is 159 // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method 160 // is active while stack scanning (mark_active_nmethods()). The hotness 161 // counter is decreased (by 1) while sweeping. 162 int _hotness_counter; 163 164 // Local state used to keep track of whether unloading is happening or not 165 volatile uint8_t _is_unloading_state; 166 167 // These are used for compiled synchronized native methods to 168 // locate the owner and stack slot for the BasicLock so that we can 169 // properly revoke the bias of the owner if necessary. They are 170 // needed because there is no debug information for compiled native 171 // wrappers and the oop maps are insufficient to allow 172 // frame::retrieve_receiver() to work. Currently they are expected 173 // to be byte offsets from the Java stack pointer for maximum code 174 // sharing between platforms. Note that currently biased locking 175 // will never cause Class instances to be biased but this code 176 // handles the static synchronized case as well. 177 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver 178 // for non-static native wrapper frames. 179 ByteSize _native_receiver_sp_offset; 180 ByteSize _native_basic_lock_sp_offset; 181 182 friend class nmethodLocker; 183 184 // For native wrappers 185 nmethod(Method* method, 186 CompilerType type, 187 int nmethod_size, 188 int compile_id, 189 CodeOffsets* offsets, 190 CodeBuffer *code_buffer, 191 int frame_size, 192 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ 193 ByteSize basic_lock_sp_offset, /* synchronized natives only */ 194 OopMapSet* oop_maps); 195 196 // Creation support 197 nmethod(Method* method, 198 CompilerType type, 199 int nmethod_size, 200 int compile_id, 201 int entry_bci, 202 CodeOffsets* offsets, 203 int orig_pc_offset, 204 DebugInformationRecorder *recorder, 205 Dependencies* dependencies, 206 CodeBuffer *code_buffer, 207 int frame_size, 208 OopMapSet* oop_maps, 209 ExceptionHandlerTable* handler_table, 210 ImplicitExceptionTable* nul_chk_table, 211 AbstractCompiler* compiler, 212 int comp_level 213 #if INCLUDE_JVMCI 214 , jweak installed_code, 215 jweak speculation_log 216 #endif 217 ); 218 219 // helper methods 220 void* operator new(size_t size, int nmethod_size, int comp_level) throw(); 221 222 const char* reloc_string_for(u_char* begin, u_char* end); 223 // Returns true if this thread changed the state of the nmethod or 224 // false if another thread performed the transition. 225 bool make_not_entrant_or_zombie(int state); 226 bool make_entrant() { Unimplemented(); return false; } 227 void inc_decompile_count(); 228 229 // Inform external interfaces that a compiled method has been unloaded 230 void post_compiled_method_unload(); 231 232 // Initailize fields to their default values 233 void init_defaults(); 234 235 // Offsets 236 int content_offset() const { return content_begin() - header_begin(); } 237 int data_offset() const { return _data_offset; } 238 239 address header_end() const { return (address) header_begin() + header_size(); } 240 241 public: 242 // create nmethod with entry_bci 243 static nmethod* new_nmethod(const methodHandle& method, 244 int compile_id, 245 int entry_bci, 246 CodeOffsets* offsets, 247 int orig_pc_offset, 248 DebugInformationRecorder* recorder, 249 Dependencies* dependencies, 250 CodeBuffer *code_buffer, 251 int frame_size, 252 OopMapSet* oop_maps, 253 ExceptionHandlerTable* handler_table, 254 ImplicitExceptionTable* nul_chk_table, 255 AbstractCompiler* compiler, 256 int comp_level 257 #if INCLUDE_JVMCI 258 , jweak installed_code = NULL, 259 jweak speculation_log = NULL 260 #endif 261 ); 262 263 // Only used for unit tests. 264 nmethod() 265 : CompiledMethod(), 266 _is_unloading_state(0), 267 _native_receiver_sp_offset(in_ByteSize(-1)), 268 _native_basic_lock_sp_offset(in_ByteSize(-1)) {} 269 270 271 static nmethod* new_native_nmethod(const methodHandle& method, 272 int compile_id, 273 CodeBuffer *code_buffer, 274 int vep_offset, 275 int frame_complete, 276 int frame_size, 277 ByteSize receiver_sp_offset, 278 ByteSize basic_lock_sp_offset, 279 OopMapSet* oop_maps); 280 281 // type info 282 bool is_nmethod() const { return true; } 283 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } 284 285 // boundaries for different parts 286 address consts_begin () const { return header_begin() + _consts_offset ; } 287 address consts_end () const { return code_begin() ; } 288 address stub_begin () const { return header_begin() + _stub_offset ; } 289 address stub_end () const { return header_begin() + _oops_offset ; } 290 address exception_begin () const { return header_begin() + _exception_offset ; } 291 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 292 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 293 oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; } 294 295 Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; } 296 Metadata** metadata_end () const { return (Metadata**) _scopes_data_begin; } 297 298 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 299 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 300 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 301 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 302 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 303 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 304 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 305 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 306 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 307 308 // Sizes 309 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 310 int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); } 311 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 312 313 int oops_count() const { assert(oops_size() % oopSize == 0, ""); return (oops_size() / oopSize) + 1; } 314 int metadata_count() const { assert(metadata_size() % wordSize == 0, ""); return (metadata_size() / wordSize) + 1; } 315 316 int total_size () const; 317 318 void dec_hotness_counter() { _hotness_counter--; } 319 void set_hotness_counter(int val) { _hotness_counter = val; } 320 int hotness_counter() const { return _hotness_counter; } 321 322 // Containment 323 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 324 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); } 325 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 326 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 327 328 // entry points 329 address entry_point() const { return _entry_point; } // normal entry point 330 address verified_entry_point() const { return _verified_entry_point; } // normal entry point without class check 331 address verified_value_entry_point() const { return _verified_value_entry_point; } // value type entry point (unpack all value args) without class check 332 address verified_value_ro_entry_point() const { return _verified_value_ro_entry_point; } // value type entry point (only unpack receiver) without class check 333 334 // flag accessing and manipulation 335 bool is_not_installed() const { return _state == not_installed; } 336 bool is_in_use() const { return _state <= in_use; } 337 bool is_alive() const { return _state < zombie; } 338 bool is_not_entrant() const { return _state == not_entrant; } 339 bool is_zombie() const { return _state == zombie; } 340 bool is_unloaded() const { return _state == unloaded; } 341 342 void clear_unloading_state(); 343 virtual bool is_unloading(); 344 virtual void do_unloading(bool unloading_occurred); 345 346 #if INCLUDE_RTM_OPT 347 // rtm state accessing and manipulating 348 RTMState rtm_state() const { return _rtm_state; } 349 void set_rtm_state(RTMState state) { _rtm_state = state; } 350 #endif 351 352 void make_in_use() { _state = in_use; } 353 // Make the nmethod non entrant. The nmethod will continue to be 354 // alive. It is used when an uncommon trap happens. Returns true 355 // if this thread changed the state of the nmethod or false if 356 // another thread performed the transition. 357 bool make_not_entrant() { 358 assert(!method()->is_method_handle_intrinsic(), "Cannot make MH intrinsic not entrant"); 359 return make_not_entrant_or_zombie(not_entrant); 360 } 361 bool make_not_used() { return make_not_entrant(); } 362 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 363 364 // used by jvmti to track if the unload event has been reported 365 bool unload_reported() { return _unload_reported; } 366 void set_unload_reported() { _unload_reported = true; } 367 368 int get_state() const { 369 return _state; 370 } 371 372 void make_unloaded(); 373 374 bool has_dependencies() { return dependencies_size() != 0; } 375 void flush_dependencies(bool delete_immediately); 376 bool has_flushed_dependencies() { return _has_flushed_dependencies; } 377 void set_has_flushed_dependencies() { 378 assert(!has_flushed_dependencies(), "should only happen once"); 379 _has_flushed_dependencies = 1; 380 } 381 382 int comp_level() const { return _comp_level; } 383 384 void unlink_from_method(bool acquire_lock); 385 386 // Support for oops in scopes and relocs: 387 // Note: index 0 is reserved for null. 388 oop oop_at(int index) const; 389 oop* oop_addr_at(int index) const { // for GC 390 // relocation indexes are biased by 1 (because 0 is reserved) 391 assert(index > 0 && index <= oops_count(), "must be a valid non-zero index"); 392 assert(!_oops_are_stale, "oops are stale"); 393 return &oops_begin()[index - 1]; 394 } 395 396 // Support for meta data in scopes and relocs: 397 // Note: index 0 is reserved for null. 398 Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); } 399 Metadata** metadata_addr_at(int index) const { // for GC 400 // relocation indexes are biased by 1 (because 0 is reserved) 401 assert(index > 0 && index <= metadata_count(), "must be a valid non-zero index"); 402 return &metadata_begin()[index - 1]; 403 } 404 405 void copy_values(GrowableArray<jobject>* oops); 406 void copy_values(GrowableArray<Metadata*>* metadata); 407 408 // Relocation support 409 private: 410 void fix_oop_relocations(address begin, address end, bool initialize_immediates); 411 inline void initialize_immediate_oop(oop* dest, jobject handle); 412 413 public: 414 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } 415 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } 416 417 // Scavengable oop support 418 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } 419 protected: 420 enum { sl_on_list = 0x01, sl_marked = 0x10 }; 421 void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; } 422 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } 423 // assertion-checking and pruning logic uses the bits of _scavenge_root_state 424 #ifndef PRODUCT 425 void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; } 426 void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; } 427 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; } 428 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. 429 #endif //PRODUCT 430 nmethod* scavenge_root_link() const { return _scavenge_root_link; } 431 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } 432 433 public: 434 435 // Sweeper support 436 long stack_traversal_mark() { return _stack_traversal_mark; } 437 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 438 439 // implicit exceptions support 440 address continuation_for_implicit_exception(address pc); 441 442 // On-stack replacement support 443 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; } 444 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; } 445 void invalidate_osr_method(); 446 nmethod* osr_link() const { return _osr_link; } 447 void set_osr_link(nmethod *n) { _osr_link = n; } 448 449 // Verify calls to dead methods have been cleaned. 450 void verify_clean_inline_caches(); 451 452 // unlink and deallocate this nmethod 453 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not 454 // expected to use any other private methods/data in this class. 455 456 protected: 457 void flush(); 458 459 public: 460 // When true is returned, it is unsafe to remove this nmethod even if 461 // it is a zombie, since the VM or the ServiceThread might still be 462 // using it. 463 bool is_locked_by_vm() const { return _lock_count >0; } 464 465 // See comment at definition of _last_seen_on_stack 466 void mark_as_seen_on_stack(); 467 bool can_convert_to_zombie(); 468 469 // Evolution support. We make old (discarded) compiled methods point to new Method*s. 470 void set_method(Method* method) { _method = method; } 471 472 #if INCLUDE_JVMCI 473 // Gets the InstalledCode object associated with this nmethod 474 // which may be NULL if this nmethod was not compiled by JVMCI 475 // or the weak reference has been cleared. 476 oop jvmci_installed_code(); 477 478 // Copies the value of the name field in the InstalledCode 479 // object (if any) associated with this nmethod into buf. 480 // Returns the value of buf if it was updated otherwise NULL. 481 char* jvmci_installed_code_name(char* buf, size_t buflen) const; 482 483 // Updates the state of the InstalledCode (if any) associated with 484 // this nmethod based on the current value of _state. 485 void maybe_invalidate_installed_code(); 486 487 // Deoptimizes the nmethod (if any) in the address field of a given 488 // InstalledCode object. The address field is zeroed upon return. 489 static void invalidate_installed_code(Handle installed_code, TRAPS); 490 491 // Gets the SpeculationLog object associated with this nmethod 492 // which may be NULL if this nmethod was not compiled by JVMCI 493 // or the weak reference has been cleared. 494 oop speculation_log(); 495 496 private: 497 // Deletes the weak reference (if any) to the InstalledCode object 498 // associated with this nmethod. 499 void clear_jvmci_installed_code(); 500 501 // Deletes the weak reference (if any) to the SpeculationLog object 502 // associated with this nmethod. 503 void clear_speculation_log(); 504 505 public: 506 #endif 507 508 public: 509 void oops_do(OopClosure* f) { oops_do(f, false); } 510 void oops_do(OopClosure* f, bool allow_zombie); 511 bool detect_scavenge_root_oops(); 512 void verify_scavenge_root_oops() PRODUCT_RETURN; 513 514 bool test_set_oops_do_mark(); 515 static void oops_do_marking_prologue(); 516 static void oops_do_marking_epilogue(); 517 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } 518 bool test_oops_do_mark() { return _oops_do_mark_link != NULL; } 519 520 private: 521 ScopeDesc* scope_desc_in(address begin, address end); 522 523 address* orig_pc_addr(const frame* fr); 524 525 public: 526 // copying of debugging information 527 void copy_scopes_pcs(PcDesc* pcs, int count); 528 void copy_scopes_data(address buffer, int size); 529 530 // Accessor/mutator for the original pc of a frame before a frame was deopted. 531 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } 532 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } 533 534 // jvmti support: 535 void post_compiled_method_load_event(); 536 jmethodID get_and_cache_jmethod_id(); 537 538 // verify operations 539 void verify(); 540 void verify_scopes(); 541 void verify_interrupt_point(address interrupt_point); 542 543 // printing support 544 void print() const; 545 void print_relocations() PRODUCT_RETURN; 546 void print_pcs() PRODUCT_RETURN; 547 void print_scopes() PRODUCT_RETURN; 548 void print_dependencies() PRODUCT_RETURN; 549 void print_value_on(outputStream* st) const PRODUCT_RETURN; 550 void print_calls(outputStream* st) PRODUCT_RETURN; 551 void print_handler_table() PRODUCT_RETURN; 552 void print_nul_chk_table() PRODUCT_RETURN; 553 void print_recorded_oops() PRODUCT_RETURN; 554 void print_recorded_metadata() PRODUCT_RETURN; 555 556 void maybe_print_nmethod(DirectiveSet* directive); 557 void print_nmethod(bool print_code); 558 559 // need to re-define this from CodeBlob else the overload hides it 560 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } 561 void print_on(outputStream* st, const char* msg) const; 562 563 // Logging 564 void log_identity(xmlStream* log) const; 565 void log_new_nmethod() const; 566 void log_state_change() const; 567 568 // Prints block-level comments, including nmethod specific block labels: 569 virtual void print_block_comment(outputStream* stream, address block_begin) const { 570 print_nmethod_labels(stream, block_begin); 571 CodeBlob::print_block_comment(stream, block_begin); 572 } 573 void print_nmethod_labels(outputStream* stream, address block_begin) const; 574 575 // Prints a comment for one native instruction (reloc info, pc desc) 576 void print_code_comment_on(outputStream* st, int column, address begin, address end); 577 static void print_statistics() PRODUCT_RETURN; 578 579 // Compiler task identification. Note that all OSR methods 580 // are numbered in an independent sequence if CICountOSR is true, 581 // and native method wrappers are also numbered independently if 582 // CICountNative is true. 583 virtual int compile_id() const { return _compile_id; } 584 const char* compile_kind() const; 585 586 // tells if any of this method's dependencies have been invalidated 587 // (this is expensive!) 588 static void check_all_dependencies(DepChange& changes); 589 590 // tells if this compiled method is dependent on the given changes, 591 // and the changes have invalidated it 592 bool check_dependency_on(DepChange& changes); 593 594 // Evolution support. Tells if this compiled method is dependent on any of 595 // redefined methods, such that if m() is replaced, 596 // this compiled method will have to be deoptimized. 597 bool is_evol_dependent(); 598 599 // Fast breakpoint support. Tells if this compiled method is 600 // dependent on the given method. Returns true if this nmethod 601 // corresponds to the given method as well. 602 virtual bool is_dependent_on_method(Method* dependee); 603 604 // is it ok to patch at address? 605 bool is_patchable_at(address instr_address); 606 607 // UseBiasedLocking support 608 ByteSize native_receiver_sp_offset() { 609 return _native_receiver_sp_offset; 610 } 611 ByteSize native_basic_lock_sp_offset() { 612 return _native_basic_lock_sp_offset; 613 } 614 615 // support for code generation 616 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 617 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 618 static int state_offset() { return offset_of(nmethod, _state); } 619 620 virtual void metadata_do(void f(Metadata*)); 621 622 NativeCallWrapper* call_wrapper_at(address call) const; 623 NativeCallWrapper* call_wrapper_before(address return_pc) const; 624 address call_instruction_address(address pc) const; 625 626 virtual CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) const; 627 virtual CompiledStaticCall* compiledStaticCall_at(address addr) const; 628 virtual CompiledStaticCall* compiledStaticCall_before(address addr) const; 629 }; 630 631 // Locks an nmethod so its code will not get removed and it will not 632 // be made into a zombie, even if it is a not_entrant method. After the 633 // nmethod becomes a zombie, if CompiledMethodUnload event processing 634 // needs to be done, then lock_nmethod() is used directly to keep the 635 // generated code from being reused too early. 636 class nmethodLocker : public StackObj { 637 CompiledMethod* _nm; 638 639 public: 640 641 // note: nm can be NULL 642 // Only JvmtiDeferredEvent::compiled_method_unload_event() 643 // should pass zombie_ok == true. 644 static void lock_nmethod(CompiledMethod* nm, bool zombie_ok = false); 645 static void unlock_nmethod(CompiledMethod* nm); // (ditto) 646 647 nmethodLocker(address pc); // derive nm from pc 648 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 649 nmethodLocker(CompiledMethod *nm) { 650 _nm = nm; 651 lock(_nm); 652 } 653 654 static void lock(CompiledMethod* method) { 655 if (method == NULL) return; 656 lock_nmethod(method); 657 } 658 659 static void unlock(CompiledMethod* method) { 660 if (method == NULL) return; 661 unlock_nmethod(method); 662 } 663 664 nmethodLocker() { _nm = NULL; } 665 ~nmethodLocker() { 666 unlock(_nm); 667 } 668 669 CompiledMethod* code() { return _nm; } 670 void set_code(CompiledMethod* new_nm) { 671 unlock(_nm); // note: This works even if _nm==new_nm. 672 _nm = new_nm; 673 lock(_nm); 674 } 675 }; 676 677 #endif // SHARE_CODE_NMETHOD_HPP