nmethod.hpp revision 1564:2a47bd84841f
1/* 2 * Copyright (c) 1997, 2010, 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// This class is used internally by nmethods, to cache 26// exception/pc/handler information. 27 28class ExceptionCache : public CHeapObj { 29 friend class VMStructs; 30 private: 31 static address _unwind_handler; 32 enum { cache_size = 16 }; 33 klassOop _exception_type; 34 address _pc[cache_size]; 35 address _handler[cache_size]; 36 int _count; 37 ExceptionCache* _next; 38 39 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; } 40 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; } 41 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; } 42 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; } 43 int count() { return _count; } 44 void increment_count() { _count++; } 45 46 public: 47 48 ExceptionCache(Handle exception, address pc, address handler); 49 50 klassOop exception_type() { return _exception_type; } 51 klassOop* exception_type_addr() { return &_exception_type; } 52 ExceptionCache* next() { return _next; } 53 void set_next(ExceptionCache *ec) { _next = ec; } 54 55 address match(Handle exception, address pc); 56 bool match_exception_with_space(Handle exception) ; 57 address test_address(address addr); 58 bool add_address_and_handler(address addr, address handler) ; 59 60 static address unwind_handler() { return _unwind_handler; } 61}; 62 63 64// cache pc descs found in earlier inquiries 65class PcDescCache VALUE_OBJ_CLASS_SPEC { 66 friend class VMStructs; 67 private: 68 enum { cache_size = 4 }; 69 PcDesc* _last_pc_desc; // most recent pc_desc found 70 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found 71 public: 72 PcDescCache() { debug_only(_last_pc_desc = NULL); } 73 void reset_to(PcDesc* initial_pc_desc); 74 PcDesc* find_pc_desc(int pc_offset, bool approximate); 75 void add_pc_desc(PcDesc* pc_desc); 76 PcDesc* last_pc_desc() { return _last_pc_desc; } 77}; 78 79 80// nmethods (native methods) are the compiled code versions of Java methods. 81// 82// An nmethod contains: 83// - header (the nmethod structure) 84// [Relocation] 85// - relocation information 86// - constant part (doubles, longs and floats used in nmethod) 87// - oop table 88// [Code] 89// - code body 90// - exception handler 91// - stub code 92// [Debugging information] 93// - oop array 94// - data array 95// - pcs 96// [Exception handler table] 97// - handler entry point array 98// [Implicit Null Pointer exception table] 99// - implicit null table array 100 101class Dependencies; 102class ExceptionHandlerTable; 103class ImplicitExceptionTable; 104class AbstractCompiler; 105class xmlStream; 106 107class nmethod : public CodeBlob { 108 friend class VMStructs; 109 friend class NMethodSweeper; 110 friend class CodeCache; // non-perm oops 111 private: 112 // Shared fields for all nmethod's 113 methodOop _method; 114 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method 115 jmethodID _jmethod_id; // Cache of method()->jmethod_id() 116 117 // To support simple linked-list chaining of nmethods: 118 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head 119 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods 120 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect 121 122 static nmethod* volatile _oops_do_mark_nmethods; 123 nmethod* volatile _oops_do_mark_link; 124 125 AbstractCompiler* _compiler; // The compiler which compiled this nmethod 126 127 // offsets for entry points 128 address _entry_point; // entry point with class check 129 address _verified_entry_point; // entry point without class check 130 address _osr_entry_point; // entry point for on stack replacement 131 132 // Offsets for different nmethod parts 133 int _exception_offset; 134 // All deoptee's will resume execution at this location described by 135 // this offset. 136 int _deoptimize_offset; 137 // All deoptee's at a MethodHandle call site will resume execution 138 // at this location described by this offset. 139 int _deoptimize_mh_offset; 140 // Offset of the unwind handler if it exists 141 int _unwind_handler_offset; 142 143#ifdef HAVE_DTRACE_H 144 int _trap_offset; 145#endif // def HAVE_DTRACE_H 146 int _stub_offset; 147 int _consts_offset; 148 int _oops_offset; // offset to where embedded oop table begins (inside data) 149 int _scopes_data_offset; 150 int _scopes_pcs_offset; 151 int _dependencies_offset; 152 int _handler_table_offset; 153 int _nul_chk_table_offset; 154 int _nmethod_end_offset; 155 156 // location in frame (offset for sp) that deopt can store the original 157 // pc during a deopt. 158 int _orig_pc_offset; 159 160 int _compile_id; // which compilation made this nmethod 161 int _comp_level; // compilation level 162 163 // protected by CodeCache_lock 164 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) 165 bool _speculatively_disconnected; // Marked for potential unload 166 167 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper) 168 bool _marked_for_deoptimization; // Used for stack deoptimization 169 170 // used by jvmti to track if an unload event has been posted for this nmethod. 171 bool _unload_reported; 172 173 // set during construction 174 unsigned int _has_unsafe_access:1; // May fault due to unsafe access. 175 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes? 176 177 // Protected by Patching_lock 178 unsigned char _state; // {alive, not_entrant, zombie, unloaded) 179 180 enum { alive = 0, 181 not_entrant = 1, // uncommon trap has happened but activations may still exist 182 zombie = 2, 183 unloaded = 3 }; 184 185 186 jbyte _scavenge_root_state; 187 188 NOT_PRODUCT(bool _has_debug_info; ) 189 190 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed) 191 jint _lock_count; 192 193 // not_entrant method removal. Each mark_sweep pass will update 194 // this mark to current sweep invocation count if it is seen on the 195 // stack. An not_entrant method can be removed when there is no 196 // more activations, i.e., when the _stack_traversal_mark is less than 197 // current sweep traversal index. 198 long _stack_traversal_mark; 199 200 ExceptionCache *_exception_cache; 201 PcDescCache _pc_desc_cache; 202 203 // These are only used for compiled synchronized native methods to 204 // locate the owner and stack slot for the BasicLock so that we can 205 // properly revoke the bias of the owner if necessary. They are 206 // needed because there is no debug information for compiled native 207 // wrappers and the oop maps are insufficient to allow 208 // frame::retrieve_receiver() to work. Currently they are expected 209 // to be byte offsets from the Java stack pointer for maximum code 210 // sharing between platforms. Note that currently biased locking 211 // will never cause Class instances to be biased but this code 212 // handles the static synchronized case as well. 213 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset; 214 ByteSize _compiled_synchronized_native_basic_lock_sp_offset; 215 216 friend class nmethodLocker; 217 218 // For native wrappers 219 nmethod(methodOop method, 220 int nmethod_size, 221 CodeOffsets* offsets, 222 CodeBuffer *code_buffer, 223 int frame_size, 224 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ 225 ByteSize basic_lock_sp_offset, /* synchronized natives only */ 226 OopMapSet* oop_maps); 227 228#ifdef HAVE_DTRACE_H 229 // For native wrappers 230 nmethod(methodOop method, 231 int nmethod_size, 232 CodeOffsets* offsets, 233 CodeBuffer *code_buffer, 234 int frame_size); 235#endif // def HAVE_DTRACE_H 236 237 // Creation support 238 nmethod(methodOop method, 239 int nmethod_size, 240 int compile_id, 241 int entry_bci, 242 CodeOffsets* offsets, 243 int orig_pc_offset, 244 DebugInformationRecorder *recorder, 245 Dependencies* dependencies, 246 CodeBuffer *code_buffer, 247 int frame_size, 248 OopMapSet* oop_maps, 249 ExceptionHandlerTable* handler_table, 250 ImplicitExceptionTable* nul_chk_table, 251 AbstractCompiler* compiler, 252 int comp_level); 253 254 // helper methods 255 void* operator new(size_t size, int nmethod_size); 256 257 const char* reloc_string_for(u_char* begin, u_char* end); 258 // Returns true if this thread changed the state of the nmethod or 259 // false if another thread performed the transition. 260 bool make_not_entrant_or_zombie(unsigned int state); 261 void inc_decompile_count(); 262 263 // Used to manipulate the exception cache 264 void add_exception_cache_entry(ExceptionCache* new_entry); 265 ExceptionCache* exception_cache_entry_for_exception(Handle exception); 266 267 // Inform external interfaces that a compiled method has been unloaded 268 void post_compiled_method_unload(); 269 270 // Initailize fields to their default values 271 void init_defaults(); 272 273 public: 274 // create nmethod with entry_bci 275 static nmethod* new_nmethod(methodHandle method, 276 int compile_id, 277 int entry_bci, 278 CodeOffsets* offsets, 279 int orig_pc_offset, 280 DebugInformationRecorder* recorder, 281 Dependencies* dependencies, 282 CodeBuffer *code_buffer, 283 int frame_size, 284 OopMapSet* oop_maps, 285 ExceptionHandlerTable* handler_table, 286 ImplicitExceptionTable* nul_chk_table, 287 AbstractCompiler* compiler, 288 int comp_level); 289 290 static nmethod* new_native_nmethod(methodHandle method, 291 CodeBuffer *code_buffer, 292 int vep_offset, 293 int frame_complete, 294 int frame_size, 295 ByteSize receiver_sp_offset, 296 ByteSize basic_lock_sp_offset, 297 OopMapSet* oop_maps); 298 299#ifdef HAVE_DTRACE_H 300 // The method we generate for a dtrace probe has to look 301 // like an nmethod as far as the rest of the system is concerned 302 // which is somewhat unfortunate. 303 static nmethod* new_dtrace_nmethod(methodHandle method, 304 CodeBuffer *code_buffer, 305 int vep_offset, 306 int trap_offset, 307 int frame_complete, 308 int frame_size); 309 310 int trap_offset() const { return _trap_offset; } 311 address trap_address() const { return code_begin() + _trap_offset; } 312 313#endif // def HAVE_DTRACE_H 314 315 // accessors 316 methodOop method() const { return _method; } 317 AbstractCompiler* compiler() const { return _compiler; } 318 319#ifndef PRODUCT 320 bool has_debug_info() const { return _has_debug_info; } 321 void set_has_debug_info(bool f) { _has_debug_info = false; } 322#endif // NOT PRODUCT 323 324 // type info 325 bool is_nmethod() const { return true; } 326 bool is_java_method() const { return !method()->is_native(); } 327 bool is_native_method() const { return method()->is_native(); } 328 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } 329 330 bool is_compiled_by_c1() const; 331 bool is_compiled_by_c2() const; 332 333 // boundaries for different parts 334 address code_begin () const { return _entry_point; } 335 address code_end () const { return header_begin() + _stub_offset ; } 336 address exception_begin () const { return header_begin() + _exception_offset ; } 337 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } 338 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } 339 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 340 address stub_begin () const { return header_begin() + _stub_offset ; } 341 address stub_end () const { return header_begin() + _consts_offset ; } 342 address consts_begin () const { return header_begin() + _consts_offset ; } 343 address consts_end () const { return header_begin() + _oops_offset ; } 344 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 345 oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; } 346 347 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } 348 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 349 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 350 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 351 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 352 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 353 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 354 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 355 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 356 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 357 358 // Sizes 359 int code_size () const { return code_end () - code_begin (); } 360 int stub_size () const { return stub_end () - stub_begin (); } 361 int consts_size () const { return consts_end () - consts_begin (); } 362 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 363 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } 364 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } 365 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 366 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } 367 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } 368 369 int total_size () const; 370 371 // Containment 372 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); } 373 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } 374 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } 375 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 376 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 377 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 378 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } 379 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } 380 381 // entry points 382 address entry_point() const { return _entry_point; } // normal entry point 383 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct 384 385 // flag accessing and manipulation 386 bool is_in_use() const { return _state == alive; } 387 bool is_alive() const { return _state == alive || _state == not_entrant; } 388 bool is_not_entrant() const { return _state == not_entrant; } 389 bool is_zombie() const { return _state == zombie; } 390 bool is_unloaded() const { return _state == unloaded; } 391 392 // Make the nmethod non entrant. The nmethod will continue to be 393 // alive. It is used when an uncommon trap happens. Returns true 394 // if this thread changed the state of the nmethod or false if 395 // another thread performed the transition. 396 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); } 397 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 398 399 // used by jvmti to track if the unload event has been reported 400 bool unload_reported() { return _unload_reported; } 401 void set_unload_reported() { _unload_reported = true; } 402 403 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; } 404 void mark_for_deoptimization() { _marked_for_deoptimization = true; } 405 406 void make_unloaded(BoolObjectClosure* is_alive, oop cause); 407 408 bool has_dependencies() { return dependencies_size() != 0; } 409 void flush_dependencies(BoolObjectClosure* is_alive); 410 bool has_flushed_dependencies() { return _has_flushed_dependencies; } 411 void set_has_flushed_dependencies() { 412 assert(!has_flushed_dependencies(), "should only happen once"); 413 _has_flushed_dependencies = 1; 414 } 415 416 bool is_marked_for_reclamation() const { return _marked_for_reclamation; } 417 void mark_for_reclamation() { _marked_for_reclamation = 1; } 418 419 bool has_unsafe_access() const { return _has_unsafe_access; } 420 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; } 421 422 bool has_method_handle_invokes() const { return _has_method_handle_invokes; } 423 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; } 424 425 bool is_speculatively_disconnected() const { return _speculatively_disconnected; } 426 void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; } 427 428 int comp_level() const { return _comp_level; } 429 430 // Support for oops in scopes and relocs: 431 // Note: index 0 is reserved for null. 432 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } 433 oop* oop_addr_at(int index) const { // for GC 434 // relocation indexes are biased by 1 (because 0 is reserved) 435 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); 436 return &oops_begin()[index - 1]; 437 } 438 439 void copy_oops(GrowableArray<jobject>* oops); 440 441 // Relocation support 442private: 443 void fix_oop_relocations(address begin, address end, bool initialize_immediates); 444 inline void initialize_immediate_oop(oop* dest, jobject handle); 445 446public: 447 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } 448 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } 449 450 bool is_at_poll_return(address pc); 451 bool is_at_poll_or_poll_return(address pc); 452 453 // Non-perm oop support 454 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } 455 protected: 456 enum { npl_on_list = 0x01, npl_marked = 0x10 }; 457 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; } 458 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } 459 // assertion-checking and pruning logic uses the bits of _scavenge_root_state 460#ifndef PRODUCT 461 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; } 462 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; } 463 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; } 464 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. 465#endif //PRODUCT 466 nmethod* scavenge_root_link() const { return _scavenge_root_link; } 467 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } 468 469 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; } 470 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; } 471 472 public: 473 474 // Sweeper support 475 long stack_traversal_mark() { return _stack_traversal_mark; } 476 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 477 478 // Exception cache support 479 ExceptionCache* exception_cache() const { return _exception_cache; } 480 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } 481 address handler_for_exception_and_pc(Handle exception, address pc); 482 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); 483 void remove_from_exception_cache(ExceptionCache* ec); 484 485 // implicit exceptions support 486 address continuation_for_implicit_exception(address pc); 487 488 // On-stack replacement support 489 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; } 490 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; } 491 void invalidate_osr_method(); 492 nmethod* osr_link() const { return _osr_link; } 493 void set_osr_link(nmethod *n) { _osr_link = n; } 494 495 // tells whether frames described by this nmethod can be deoptimized 496 // note: native wrappers cannot be deoptimized. 497 bool can_be_deoptimized() const { return is_java_method(); } 498 499 // Inline cache support 500 void clear_inline_caches(); 501 void cleanup_inline_caches(); 502 bool inlinecache_check_contains(address addr) const { 503 return (addr >= instructions_begin() && addr < verified_entry_point()); 504 } 505 506 // unlink and deallocate this nmethod 507 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not 508 // expected to use any other private methods/data in this class. 509 510 protected: 511 void flush(); 512 513 public: 514 // If returning true, it is unsafe to remove this nmethod even though it is a zombie 515 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint. 516 bool is_locked_by_vm() const { return _lock_count >0; } 517 518 // See comment at definition of _last_seen_on_stack 519 void mark_as_seen_on_stack(); 520 bool can_not_entrant_be_converted(); 521 522 // Evolution support. We make old (discarded) compiled methods point to new methodOops. 523 void set_method(methodOop method) { _method = method; } 524 525 // GC support 526 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, 527 bool unloading_occurred); 528 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive, 529 oop* root, bool unloading_occurred); 530 531 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, 532 OopClosure* f); 533 void oops_do(OopClosure* f) { oops_do(f, false); } 534 void oops_do(OopClosure* f, bool do_strong_roots_only); 535 bool detect_scavenge_root_oops(); 536 void verify_scavenge_root_oops() PRODUCT_RETURN; 537 538 bool test_set_oops_do_mark(); 539 static void oops_do_marking_prologue(); 540 static void oops_do_marking_epilogue(); 541 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } 542 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }) 543 544 // ScopeDesc for an instruction 545 ScopeDesc* scope_desc_at(address pc); 546 547 private: 548 ScopeDesc* scope_desc_in(address begin, address end); 549 550 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } 551 552 PcDesc* find_pc_desc_internal(address pc, bool approximate); 553 554 PcDesc* find_pc_desc(address pc, bool approximate) { 555 PcDesc* desc = _pc_desc_cache.last_pc_desc(); 556 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) { 557 return desc; 558 } 559 return find_pc_desc_internal(pc, approximate); 560 } 561 562 public: 563 // ScopeDesc retrieval operation 564 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } 565 // pc_desc_near returns the first PcDesc at or after the givne pc. 566 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } 567 568 public: 569 // copying of debugging information 570 void copy_scopes_pcs(PcDesc* pcs, int count); 571 void copy_scopes_data(address buffer, int size); 572 573 // Deopt 574 // Return true is the PC is one would expect if the frame is being deopted. 575 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); } 576 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); } 577 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); } 578 // Accessor/mutator for the original pc of a frame before a frame was deopted. 579 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } 580 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } 581 582 static address get_deopt_original_pc(const frame* fr); 583 584 // MethodHandle 585 bool is_method_handle_return(address return_pc); 586 587 // jvmti support: 588 void post_compiled_method_load_event(); 589 jmethodID get_and_cache_jmethod_id(); 590 591 // verify operations 592 void verify(); 593 void verify_scopes(); 594 void verify_interrupt_point(address interrupt_point); 595 596 // printing support 597 void print() const; 598 void print_code(); 599 void print_relocations() PRODUCT_RETURN; 600 void print_pcs() PRODUCT_RETURN; 601 void print_scopes() PRODUCT_RETURN; 602 void print_dependencies() PRODUCT_RETURN; 603 void print_value_on(outputStream* st) const PRODUCT_RETURN; 604 void print_calls(outputStream* st) PRODUCT_RETURN; 605 void print_handler_table() PRODUCT_RETURN; 606 void print_nul_chk_table() PRODUCT_RETURN; 607 void print_nmethod(bool print_code); 608 609 void print_on(outputStream* st, const char* title) const; 610 611 // Logging 612 void log_identity(xmlStream* log) const; 613 void log_new_nmethod() const; 614 void log_state_change() const; 615 616 // Prints block-level comments, including nmethod specific block labels: 617 virtual void print_block_comment(outputStream* stream, address block_begin) { 618 print_nmethod_labels(stream, block_begin); 619 CodeBlob::print_block_comment(stream, block_begin); 620 } 621 void print_nmethod_labels(outputStream* stream, address block_begin); 622 623 // Prints a comment for one native instruction (reloc info, pc desc) 624 void print_code_comment_on(outputStream* st, int column, address begin, address end); 625 static void print_statistics() PRODUCT_RETURN; 626 627 // Compiler task identification. Note that all OSR methods 628 // are numbered in an independent sequence if CICountOSR is true, 629 // and native method wrappers are also numbered independently if 630 // CICountNative is true. 631 int compile_id() const { return _compile_id; } 632 const char* compile_kind() const; 633 634 // For debugging 635 // CompiledIC* IC_at(char* p) const; 636 // PrimitiveIC* primitiveIC_at(char* p) const; 637 oop embeddedOop_at(address p); 638 639 // tells if any of this method's dependencies have been invalidated 640 // (this is expensive!) 641 bool check_all_dependencies(); 642 643 // tells if this compiled method is dependent on the given changes, 644 // and the changes have invalidated it 645 bool check_dependency_on(DepChange& changes); 646 647 // Evolution support. Tells if this compiled method is dependent on any of 648 // methods m() of class dependee, such that if m() in dependee is replaced, 649 // this compiled method will have to be deoptimized. 650 bool is_evol_dependent_on(klassOop dependee); 651 652 // Fast breakpoint support. Tells if this compiled method is 653 // dependent on the given method. Returns true if this nmethod 654 // corresponds to the given method as well. 655 bool is_dependent_on_method(methodOop dependee); 656 657 // is it ok to patch at address? 658 bool is_patchable_at(address instr_address); 659 660 // UseBiasedLocking support 661 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() { 662 return _compiled_synchronized_native_basic_lock_owner_sp_offset; 663 } 664 ByteSize compiled_synchronized_native_basic_lock_sp_offset() { 665 return _compiled_synchronized_native_basic_lock_sp_offset; 666 } 667 668 // support for code generation 669 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 670 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 671 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } 672 673}; 674 675// Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method 676class nmethodLocker : public StackObj { 677 nmethod* _nm; 678 679 static void lock_nmethod(nmethod* nm); // note: nm can be NULL 680 static void unlock_nmethod(nmethod* nm); // (ditto) 681 682 public: 683 nmethodLocker(address pc); // derive nm from pc 684 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 685 nmethodLocker() { _nm = NULL; } 686 ~nmethodLocker() { unlock_nmethod(_nm); } 687 688 nmethod* code() { return _nm; } 689 void set_code(nmethod* new_nm) { 690 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. 691 _nm = new_nm; 692 lock_nmethod(_nm); 693 } 694}; 695