nmethod.hpp revision 9287:40bd4478a362
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 35class 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 68class 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 108class Dependencies; 109class ExceptionHandlerTable; 110class ImplicitExceptionTable; 111class AbstractCompiler; 112class xmlStream; 113 114class 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#if INCLUDE_JVMCI 130 // Needed to keep nmethods alive that are not the default nmethod for the associated Method. 131 oop _jvmci_installed_code; 132 oop _speculation_log; 133#endif 134 135 // To support simple linked-list chaining of nmethods: 136 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head 137 138 union { 139 // Used by G1 to chain nmethods. 140 nmethod* _unloading_next; 141 // Used by non-G1 GCs to chain nmethods. 142 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods 143 }; 144 145 static nmethod* volatile _oops_do_mark_nmethods; 146 nmethod* volatile _oops_do_mark_link; 147 148 AbstractCompiler* _compiler; // The compiler which compiled this nmethod 149 150 // offsets for entry points 151 address _entry_point; // entry point with class check 152 address _verified_entry_point; // entry point without class check 153 address _osr_entry_point; // entry point for on stack replacement 154 155 // Offsets for different nmethod parts 156 int _exception_offset; 157 // All deoptee's will resume execution at this location described by 158 // this offset. 159 int _deoptimize_offset; 160 // All deoptee's at a MethodHandle call site will resume execution 161 // at this location described by this offset. 162 int _deoptimize_mh_offset; 163 // Offset of the unwind handler if it exists 164 int _unwind_handler_offset; 165 166 int _consts_offset; 167 int _stub_offset; 168 int _oops_offset; // offset to where embedded oop table begins (inside data) 169 int _metadata_offset; // embedded meta data table 170 int _scopes_data_offset; 171 int _scopes_pcs_offset; 172 int _dependencies_offset; 173 int _handler_table_offset; 174 int _nul_chk_table_offset; 175 int _nmethod_end_offset; 176 177 // location in frame (offset for sp) that deopt can store the original 178 // pc during a deopt. 179 int _orig_pc_offset; 180 181 int _compile_id; // which compilation made this nmethod 182 int _comp_level; // compilation level 183 184 // protected by CodeCache_lock 185 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) 186 187 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper) 188 bool _marked_for_deoptimization; // Used for stack deoptimization 189 190 // used by jvmti to track if an unload event has been posted for this nmethod. 191 bool _unload_reported; 192 193 // set during construction 194 unsigned int _has_unsafe_access:1; // May fault due to unsafe access. 195 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes? 196 unsigned int _lazy_critical_native:1; // Lazy JNI critical native 197 unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints 198 199 // Protected by Patching_lock 200 volatile unsigned char _state; // {alive, not_entrant, zombie, unloaded} 201 202 volatile unsigned char _unloading_clock; // Incremented after GC unloaded/cleaned the nmethod 203 204#ifdef ASSERT 205 bool _oops_are_stale; // indicates that it's no longer safe to access oops section 206#endif 207 208 jbyte _scavenge_root_state; 209 210#if INCLUDE_RTM_OPT 211 // RTM state at compile time. Used during deoptimization to decide 212 // whether to restart collecting RTM locking abort statistic again. 213 RTMState _rtm_state; 214#endif 215 216 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed 217 // and is not made into a zombie. However, once the nmethod is made into 218 // a zombie, it will be locked one final time if CompiledMethodUnload 219 // event processing needs to be done. 220 volatile jint _lock_count; 221 222 // not_entrant method removal. Each mark_sweep pass will update 223 // this mark to current sweep invocation count if it is seen on the 224 // stack. An not_entrant method can be removed when there are no 225 // more activations, i.e., when the _stack_traversal_mark is less than 226 // current sweep traversal index. 227 long _stack_traversal_mark; 228 229 // The _hotness_counter indicates the hotness of a method. The higher 230 // the value the hotter the method. The hotness counter of a nmethod is 231 // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method 232 // is active while stack scanning (mark_active_nmethods()). The hotness 233 // counter is decreased (by 1) while sweeping. 234 int _hotness_counter; 235 236 ExceptionCache *_exception_cache; 237 PcDescCache _pc_desc_cache; 238 239 // These are used for compiled synchronized native methods to 240 // locate the owner and stack slot for the BasicLock so that we can 241 // properly revoke the bias of the owner if necessary. They are 242 // needed because there is no debug information for compiled native 243 // wrappers and the oop maps are insufficient to allow 244 // frame::retrieve_receiver() to work. Currently they are expected 245 // to be byte offsets from the Java stack pointer for maximum code 246 // sharing between platforms. Note that currently biased locking 247 // will never cause Class instances to be biased but this code 248 // handles the static synchronized case as well. 249 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver 250 // for non-static native wrapper frames. 251 ByteSize _native_receiver_sp_offset; 252 ByteSize _native_basic_lock_sp_offset; 253 254 friend class nmethodLocker; 255 256 // For native wrappers 257 nmethod(Method* method, 258 int nmethod_size, 259 int compile_id, 260 CodeOffsets* offsets, 261 CodeBuffer *code_buffer, 262 int frame_size, 263 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ 264 ByteSize basic_lock_sp_offset, /* synchronized natives only */ 265 OopMapSet* oop_maps); 266 267 // Creation support 268 nmethod(Method* method, 269 int nmethod_size, 270 int compile_id, 271 int entry_bci, 272 CodeOffsets* offsets, 273 int orig_pc_offset, 274 DebugInformationRecorder *recorder, 275 Dependencies* dependencies, 276 CodeBuffer *code_buffer, 277 int frame_size, 278 OopMapSet* oop_maps, 279 ExceptionHandlerTable* handler_table, 280 ImplicitExceptionTable* nul_chk_table, 281 AbstractCompiler* compiler, 282 int comp_level 283#if INCLUDE_JVMCI 284 , Handle installed_code, 285 Handle speculation_log 286#endif 287 ); 288 289 // helper methods 290 void* operator new(size_t size, int nmethod_size, int comp_level) throw(); 291 292 const char* reloc_string_for(u_char* begin, u_char* end); 293 // Returns true if this thread changed the state of the nmethod or 294 // false if another thread performed the transition. 295 bool make_not_entrant_or_zombie(unsigned int state); 296 void inc_decompile_count(); 297 298 // Used to manipulate the exception cache 299 void add_exception_cache_entry(ExceptionCache* new_entry); 300 ExceptionCache* exception_cache_entry_for_exception(Handle exception); 301 302 // Inform external interfaces that a compiled method has been unloaded 303 void post_compiled_method_unload(); 304 305 // Initailize fields to their default values 306 void init_defaults(); 307 308 public: 309 // create nmethod with entry_bci 310 static nmethod* new_nmethod(methodHandle method, 311 int compile_id, 312 int entry_bci, 313 CodeOffsets* offsets, 314 int orig_pc_offset, 315 DebugInformationRecorder* recorder, 316 Dependencies* dependencies, 317 CodeBuffer *code_buffer, 318 int frame_size, 319 OopMapSet* oop_maps, 320 ExceptionHandlerTable* handler_table, 321 ImplicitExceptionTable* nul_chk_table, 322 AbstractCompiler* compiler, 323 int comp_level 324#if INCLUDE_JVMCI 325 , Handle installed_code = Handle(), 326 Handle speculation_log = Handle() 327#endif 328 ); 329 330 static nmethod* new_native_nmethod(methodHandle method, 331 int compile_id, 332 CodeBuffer *code_buffer, 333 int vep_offset, 334 int frame_complete, 335 int frame_size, 336 ByteSize receiver_sp_offset, 337 ByteSize basic_lock_sp_offset, 338 OopMapSet* oop_maps); 339 340 // accessors 341 Method* method() const { return _method; } 342 AbstractCompiler* compiler() const { return _compiler; } 343 344 // type info 345 bool is_nmethod() const { return true; } 346 bool is_java_method() const { return !method()->is_native(); } 347 bool is_native_method() const { return method()->is_native(); } 348 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } 349 350 bool is_compiled_by_c1() const; 351 bool is_compiled_by_jvmci() const; 352 bool is_compiled_by_c2() const; 353 bool is_compiled_by_shark() const; 354 355 // boundaries for different parts 356 address consts_begin () const { return header_begin() + _consts_offset ; } 357 address consts_end () const { return header_begin() + code_offset() ; } 358 address insts_begin () const { return header_begin() + code_offset() ; } 359 address insts_end () const { return header_begin() + _stub_offset ; } 360 address stub_begin () const { return header_begin() + _stub_offset ; } 361 address stub_end () const { return header_begin() + _oops_offset ; } 362 address exception_begin () const { return header_begin() + _exception_offset ; } 363 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } 364 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } 365 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 366 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 367 oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; } 368 369 Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; } 370 Metadata** metadata_end () const { return (Metadata**) (header_begin() + _scopes_data_offset) ; } 371 372 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } 373 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 374 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 375 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 376 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 377 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 378 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 379 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 380 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 381 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 382 383 // Sizes 384 int consts_size () const { return consts_end () - consts_begin (); } 385 int insts_size () const { return insts_end () - insts_begin (); } 386 int stub_size () const { return stub_end () - stub_begin (); } 387 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 388 int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); } 389 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } 390 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } 391 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 392 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } 393 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } 394 395 int total_size () const; 396 397 void dec_hotness_counter() { _hotness_counter--; } 398 void set_hotness_counter(int val) { _hotness_counter = val; } 399 int hotness_counter() const { return _hotness_counter; } 400 401 // Containment 402 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } 403 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); } 404 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } 405 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 406 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); } 407 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 408 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 409 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } 410 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } 411 412 // entry points 413 address entry_point() const { return _entry_point; } // normal entry point 414 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct 415 416 enum { in_use = 0, // executable nmethod 417 not_entrant = 1, // marked for deoptimization but activations may still exist, 418 // will be transformed to zombie when all activations are gone 419 zombie = 2, // no activations exist, nmethod is ready for purge 420 unloaded = 3 }; // there should be no activations, should not be called, 421 // will be transformed to zombie immediately 422 423 // flag accessing and manipulation 424 bool is_in_use() const { return _state == in_use; } 425 bool is_alive() const { return _state == in_use || _state == not_entrant; } 426 bool is_not_entrant() const { return _state == not_entrant; } 427 bool is_zombie() const { return _state == zombie; } 428 bool is_unloaded() const { return _state == unloaded; } 429 430#if INCLUDE_RTM_OPT 431 // rtm state accessing and manipulating 432 RTMState rtm_state() const { return _rtm_state; } 433 void set_rtm_state(RTMState state) { _rtm_state = state; } 434#endif 435 436 // Make the nmethod non entrant. The nmethod will continue to be 437 // alive. It is used when an uncommon trap happens. Returns true 438 // if this thread changed the state of the nmethod or false if 439 // another thread performed the transition. 440 bool make_not_entrant() { 441 assert(!method()->is_method_handle_intrinsic(), "Cannot make MH intrinsic not entrant"); 442 return make_not_entrant_or_zombie(not_entrant); 443 } 444 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 445 446 // used by jvmti to track if the unload event has been reported 447 bool unload_reported() { return _unload_reported; } 448 void set_unload_reported() { _unload_reported = true; } 449 450 void set_unloading_next(nmethod* next) { _unloading_next = next; } 451 nmethod* unloading_next() { return _unloading_next; } 452 453 static unsigned char global_unloading_clock() { return _global_unloading_clock; } 454 static void increase_unloading_clock(); 455 456 void set_unloading_clock(unsigned char unloading_clock); 457 unsigned char unloading_clock(); 458 459 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; } 460 void mark_for_deoptimization() { _marked_for_deoptimization = true; } 461 462 void make_unloaded(BoolObjectClosure* is_alive, oop cause); 463 464 bool has_dependencies() { return dependencies_size() != 0; } 465 void flush_dependencies(BoolObjectClosure* is_alive); 466 bool has_flushed_dependencies() { return _has_flushed_dependencies; } 467 void set_has_flushed_dependencies() { 468 assert(!has_flushed_dependencies(), "should only happen once"); 469 _has_flushed_dependencies = 1; 470 } 471 472 bool is_marked_for_reclamation() const { return _marked_for_reclamation; } 473 void mark_for_reclamation() { _marked_for_reclamation = 1; } 474 475 bool has_unsafe_access() const { return _has_unsafe_access; } 476 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; } 477 478 bool has_method_handle_invokes() const { return _has_method_handle_invokes; } 479 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; } 480 481 bool is_lazy_critical_native() const { return _lazy_critical_native; } 482 void set_lazy_critical_native(bool z) { _lazy_critical_native = z; } 483 484 bool has_wide_vectors() const { return _has_wide_vectors; } 485 void set_has_wide_vectors(bool z) { _has_wide_vectors = z; } 486 487 int comp_level() const { return _comp_level; } 488 489 // Support for oops in scopes and relocs: 490 // Note: index 0 is reserved for null. 491 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } 492 oop* oop_addr_at(int index) const { // for GC 493 // relocation indexes are biased by 1 (because 0 is reserved) 494 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); 495 assert(!_oops_are_stale, "oops are stale"); 496 return &oops_begin()[index - 1]; 497 } 498 499 // Support for meta data in scopes and relocs: 500 // Note: index 0 is reserved for null. 501 Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); } 502 Metadata** metadata_addr_at(int index) const { // for GC 503 // relocation indexes are biased by 1 (because 0 is reserved) 504 assert(index > 0 && index <= metadata_size(), "must be a valid non-zero index"); 505 return &metadata_begin()[index - 1]; 506 } 507 508 void copy_values(GrowableArray<jobject>* oops); 509 void copy_values(GrowableArray<Metadata*>* metadata); 510 511 // Relocation support 512private: 513 void fix_oop_relocations(address begin, address end, bool initialize_immediates); 514 inline void initialize_immediate_oop(oop* dest, jobject handle); 515 516public: 517 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } 518 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } 519 void verify_oop_relocations(); 520 521 bool is_at_poll_return(address pc); 522 bool is_at_poll_or_poll_return(address pc); 523 524 // Scavengable oop support 525 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } 526 protected: 527 enum { sl_on_list = 0x01, sl_marked = 0x10 }; 528 void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; } 529 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } 530 // assertion-checking and pruning logic uses the bits of _scavenge_root_state 531#ifndef PRODUCT 532 void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; } 533 void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; } 534 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; } 535 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. 536#endif //PRODUCT 537 nmethod* scavenge_root_link() const { return _scavenge_root_link; } 538 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } 539 540 public: 541 542 // Sweeper support 543 long stack_traversal_mark() { return _stack_traversal_mark; } 544 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 545 546 // Exception cache support 547 ExceptionCache* exception_cache() const { return _exception_cache; } 548 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } 549 address handler_for_exception_and_pc(Handle exception, address pc); 550 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); 551 void clean_exception_cache(BoolObjectClosure* is_alive); 552 553 // implicit exceptions support 554 address continuation_for_implicit_exception(address pc); 555 556 // On-stack replacement support 557 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; } 558 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; } 559 void invalidate_osr_method(); 560 nmethod* osr_link() const { return _osr_link; } 561 void set_osr_link(nmethod *n) { _osr_link = n; } 562 563 // tells whether frames described by this nmethod can be deoptimized 564 // note: native wrappers cannot be deoptimized. 565 bool can_be_deoptimized() const { return is_java_method(); } 566 567 // Inline cache support 568 void clear_inline_caches(); 569 void clear_ic_stubs(); 570 void cleanup_inline_caches(); 571 bool inlinecache_check_contains(address addr) const { 572 return (addr >= code_begin() && addr < verified_entry_point()); 573 } 574 575 // Verify calls to dead methods have been cleaned. 576 void verify_clean_inline_caches(); 577 // Verify and count cached icholder relocations. 578 int verify_icholder_relocations(); 579 // Check that all metadata is still alive 580 void verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive); 581 582 // unlink and deallocate this nmethod 583 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not 584 // expected to use any other private methods/data in this class. 585 586 protected: 587 void flush(); 588 589 public: 590 // When true is returned, it is unsafe to remove this nmethod even if 591 // it is a zombie, since the VM or the ServiceThread might still be 592 // using it. 593 bool is_locked_by_vm() const { return _lock_count >0; } 594 595 // See comment at definition of _last_seen_on_stack 596 void mark_as_seen_on_stack(); 597 bool can_convert_to_zombie(); 598 599 // Evolution support. We make old (discarded) compiled methods point to new Method*s. 600 void set_method(Method* method) { _method = method; } 601 602#if INCLUDE_JVMCI 603 oop jvmci_installed_code() { return _jvmci_installed_code ; } 604 char* jvmci_installed_code_name(char* buf, size_t buflen); 605 void set_jvmci_installed_code(oop installed_code) { _jvmci_installed_code = installed_code; } 606 void maybe_invalidate_installed_code(); 607 oop speculation_log() { return _speculation_log ; } 608 void set_speculation_log(oop speculation_log) { _speculation_log = speculation_log; } 609#endif 610 611 // GC support 612 void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred); 613 // The parallel versions are used by G1. 614 bool do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred); 615 void do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred); 616 617 private: 618 // Unload a nmethod if the *root object is dead. 619 bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred); 620 bool unload_if_dead_at(RelocIterator *iter_at_oop, BoolObjectClosure* is_alive, bool unloading_occurred); 621 622 public: 623 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, 624 OopClosure* f); 625 void oops_do(OopClosure* f) { oops_do(f, false); } 626 void oops_do(OopClosure* f, bool allow_zombie); 627 bool detect_scavenge_root_oops(); 628 void verify_scavenge_root_oops() PRODUCT_RETURN; 629 630 bool test_set_oops_do_mark(); 631 static void oops_do_marking_prologue(); 632 static void oops_do_marking_epilogue(); 633 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } 634 bool test_oops_do_mark() { return _oops_do_mark_link != NULL; } 635 636 // ScopeDesc for an instruction 637 ScopeDesc* scope_desc_at(address pc); 638 639 private: 640 ScopeDesc* scope_desc_in(address begin, address end); 641 642 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } 643 644 PcDesc* find_pc_desc_internal(address pc, bool approximate); 645 646 PcDesc* find_pc_desc(address pc, bool approximate) { 647 PcDesc* desc = _pc_desc_cache.last_pc_desc(); 648 if (desc != NULL && desc->pc_offset() == pc - code_begin()) { 649 return desc; 650 } 651 return find_pc_desc_internal(pc, approximate); 652 } 653 654 public: 655 // ScopeDesc retrieval operation 656 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } 657 // pc_desc_near returns the first PcDesc at or after the givne pc. 658 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } 659 660 public: 661 // copying of debugging information 662 void copy_scopes_pcs(PcDesc* pcs, int count); 663 void copy_scopes_data(address buffer, int size); 664 665 // Deopt 666 // Return true is the PC is one would expect if the frame is being deopted. 667 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); } 668 bool is_deopt_entry (address pc); 669 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); } 670 // Accessor/mutator for the original pc of a frame before a frame was deopted. 671 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } 672 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } 673 674 static address get_deopt_original_pc(const frame* fr); 675 676 // MethodHandle 677 bool is_method_handle_return(address return_pc); 678 679 // jvmti support: 680 void post_compiled_method_load_event(); 681 jmethodID get_and_cache_jmethod_id(); 682 683 // verify operations 684 void verify(); 685 void verify_scopes(); 686 void verify_interrupt_point(address interrupt_point); 687 688 // printing support 689 void print() const; 690 void print_code(); 691 void print_relocations() PRODUCT_RETURN; 692 void print_pcs() PRODUCT_RETURN; 693 void print_scopes() PRODUCT_RETURN; 694 void print_dependencies() PRODUCT_RETURN; 695 void print_value_on(outputStream* st) const PRODUCT_RETURN; 696 void print_calls(outputStream* st) PRODUCT_RETURN; 697 void print_handler_table() PRODUCT_RETURN; 698 void print_nul_chk_table() PRODUCT_RETURN; 699 void print_nmethod(bool print_code); 700 701 // need to re-define this from CodeBlob else the overload hides it 702 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } 703 void print_on(outputStream* st, const char* msg) const; 704 705 // Logging 706 void log_identity(xmlStream* log) const; 707 void log_new_nmethod() const; 708 void log_state_change() const; 709 710 // Prints block-level comments, including nmethod specific block labels: 711 virtual void print_block_comment(outputStream* stream, address block_begin) const { 712 print_nmethod_labels(stream, block_begin); 713 CodeBlob::print_block_comment(stream, block_begin); 714 } 715 void print_nmethod_labels(outputStream* stream, address block_begin) const; 716 717 // Prints a comment for one native instruction (reloc info, pc desc) 718 void print_code_comment_on(outputStream* st, int column, address begin, address end); 719 static void print_statistics() PRODUCT_RETURN; 720 721 // Compiler task identification. Note that all OSR methods 722 // are numbered in an independent sequence if CICountOSR is true, 723 // and native method wrappers are also numbered independently if 724 // CICountNative is true. 725 int compile_id() const { return _compile_id; } 726 const char* compile_kind() const; 727 728 // tells if any of this method's dependencies have been invalidated 729 // (this is expensive!) 730 static void check_all_dependencies(DepChange& changes); 731 732 // tells if this compiled method is dependent on the given changes, 733 // and the changes have invalidated it 734 bool check_dependency_on(DepChange& changes); 735 736 // Evolution support. Tells if this compiled method is dependent on any of 737 // methods m() of class dependee, such that if m() in dependee is replaced, 738 // this compiled method will have to be deoptimized. 739 bool is_evol_dependent_on(Klass* dependee); 740 741 // Fast breakpoint support. Tells if this compiled method is 742 // dependent on the given method. Returns true if this nmethod 743 // corresponds to the given method as well. 744 bool is_dependent_on_method(Method* dependee); 745 746 // is it ok to patch at address? 747 bool is_patchable_at(address instr_address); 748 749 // UseBiasedLocking support 750 ByteSize native_receiver_sp_offset() { 751 return _native_receiver_sp_offset; 752 } 753 ByteSize native_basic_lock_sp_offset() { 754 return _native_basic_lock_sp_offset; 755 } 756 757 // support for code generation 758 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 759 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 760 static int state_offset() { return offset_of(nmethod, _state); } 761 762 // RedefineClasses support. Mark metadata in nmethods as on_stack so that 763 // redefine classes doesn't purge it. 764 static void mark_on_stack(nmethod* nm) { 765 nm->metadata_do(Metadata::mark_on_stack); 766 } 767 void metadata_do(void f(Metadata*)); 768}; 769 770// Locks an nmethod so its code will not get removed and it will not 771// be made into a zombie, even if it is a not_entrant method. After the 772// nmethod becomes a zombie, if CompiledMethodUnload event processing 773// needs to be done, then lock_nmethod() is used directly to keep the 774// generated code from being reused too early. 775class nmethodLocker : public StackObj { 776 nmethod* _nm; 777 778 public: 779 780 // note: nm can be NULL 781 // Only JvmtiDeferredEvent::compiled_method_unload_event() 782 // should pass zombie_ok == true. 783 static void lock_nmethod(nmethod* nm, bool zombie_ok = false); 784 static void unlock_nmethod(nmethod* nm); // (ditto) 785 786 nmethodLocker(address pc); // derive nm from pc 787 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 788 nmethodLocker() { _nm = NULL; } 789 ~nmethodLocker() { unlock_nmethod(_nm); } 790 791 nmethod* code() { return _nm; } 792 void set_code(nmethod* new_nm) { 793 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. 794 _nm = new_nm; 795 lock_nmethod(_nm); 796 } 797}; 798 799#endif // SHARE_VM_CODE_NMETHOD_HPP 800