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 #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 31 // This class is used internally by nmethods, to cache 32 // exception/pc/handler information. 33 34 class ExceptionCache : public CHeapObj { 35 friend class VMStructs; 36 private: 37 static address _unwind_handler; 38 enum { cache_size = 16 }; 39 klassOop _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 klassOop exception_type() { return _exception_type; } 57 klassOop* exception_type_addr() { return &_exception_type; } 58 ExceptionCache* next() { return _next; } 59 void set_next(ExceptionCache *ec) { _next = ec; } 60 61 address match(Handle exception, address pc); 62 bool match_exception_with_space(Handle exception) ; 63 address test_address(address addr); 64 bool add_address_and_handler(address addr, address handler) ; 65 66 static address unwind_handler() { return _unwind_handler; } 67 }; 68 69 70 // cache pc descs found in earlier inquiries 71 class PcDescCache VALUE_OBJ_CLASS_SPEC { 72 friend class VMStructs; 73 private: 74 enum { cache_size = 4 }; 75 PcDesc* _last_pc_desc; // most recent pc_desc found 76 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found 77 public: 78 PcDescCache() { debug_only(_last_pc_desc = NULL); } 79 void reset_to(PcDesc* initial_pc_desc); 80 PcDesc* find_pc_desc(int pc_offset, bool approximate); 81 void add_pc_desc(PcDesc* pc_desc); 82 PcDesc* last_pc_desc() { return _last_pc_desc; } 83 }; 84 85 86 // nmethods (native methods) are the compiled code versions of Java methods. 87 // 88 // An nmethod contains: 89 // - header (the nmethod structure) 90 // [Relocation] 91 // - relocation information 92 // - constant part (doubles, longs and floats used in nmethod) 93 // - oop table 94 // [Code] 95 // - code body 96 // - exception handler 97 // - stub code 98 // [Debugging information] 99 // - oop array 100 // - data array 101 // - pcs 102 // [Exception handler table] 103 // - handler entry point array 104 // [Implicit Null Pointer exception table] 105 // - implicit null table array 106 107 class Dependencies; 108 class ExceptionHandlerTable; 109 class ImplicitExceptionTable; 110 class AbstractCompiler; 111 class xmlStream; 112 113 class nmethod : public CodeBlob { 114 friend class VMStructs; 115 friend class NMethodSweeper; 116 friend class CodeCache; // non-perm oops 117 private: 118 // Shared fields for all nmethod's 119 methodOop _method; 120 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method 121 jmethodID _jmethod_id; // Cache of method()->jmethod_id() 122 123 // To support simple linked-list chaining of nmethods: 124 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head 125 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods 126 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect 127 128 static nmethod* volatile _oops_do_mark_nmethods; 129 nmethod* volatile _oops_do_mark_link; 130 131 AbstractCompiler* _compiler; // The compiler which compiled this nmethod 132 133 // offsets for entry points 134 address _entry_point; // entry point with class check 135 address _verified_entry_point; // entry point without class check 136 address _osr_entry_point; // entry point for on stack replacement 137 138 // Offsets for different nmethod parts 139 int _exception_offset; 140 // All deoptee's will resume execution at this location described by 141 // this offset. 142 int _deoptimize_offset; 143 // All deoptee's at a MethodHandle call site will resume execution 144 // at this location described by this offset. 145 int _deoptimize_mh_offset; 146 // Offset of the unwind handler if it exists 147 int _unwind_handler_offset; 148 149 #ifdef HAVE_DTRACE_H 150 int _trap_offset; 151 #endif // def HAVE_DTRACE_H 152 int _consts_offset; 153 int _stub_offset; 154 int _oops_offset; // offset to where embedded oop table begins (inside data) 155 int _scopes_data_offset; 156 int _scopes_pcs_offset; 157 int _dependencies_offset; 158 int _handler_table_offset; 159 int _nul_chk_table_offset; 160 int _nmethod_end_offset; 161 162 // location in frame (offset for sp) that deopt can store the original 163 // pc during a deopt. 164 int _orig_pc_offset; 165 166 int _compile_id; // which compilation made this nmethod 167 int _comp_level; // compilation level 168 169 // protected by CodeCache_lock 170 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) 171 bool _speculatively_disconnected; // Marked for potential unload 172 173 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper) 174 bool _marked_for_deoptimization; // Used for stack deoptimization 175 176 // used by jvmti to track if an unload event has been posted for this nmethod. 177 bool _unload_reported; 178 179 // set during construction 180 unsigned int _has_unsafe_access:1; // May fault due to unsafe access. 181 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes? 182 183 // Protected by Patching_lock 184 unsigned char _state; // {alive, not_entrant, zombie, unloaded) 185 186 #ifdef ASSERT 187 bool _oops_are_stale; // indicates that it's no longer safe to access oops section 188 #endif 189 190 enum { alive = 0, 191 not_entrant = 1, // uncommon trap has happened but activations may still exist 192 zombie = 2, 193 unloaded = 3 }; 194 195 196 jbyte _scavenge_root_state; 197 198 NOT_PRODUCT(bool _has_debug_info; ) 199 200 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed) 201 jint _lock_count; 202 203 // not_entrant method removal. Each mark_sweep pass will update 204 // this mark to current sweep invocation count if it is seen on the 205 // stack. An not_entrant method can be removed when there is no 206 // more activations, i.e., when the _stack_traversal_mark is less than 207 // current sweep traversal index. 208 long _stack_traversal_mark; 209 210 ExceptionCache *_exception_cache; 211 PcDescCache _pc_desc_cache; 212 213 // These are only used for compiled synchronized native methods to 214 // locate the owner and stack slot for the BasicLock so that we can 215 // properly revoke the bias of the owner if necessary. They are 216 // needed because there is no debug information for compiled native 217 // wrappers and the oop maps are insufficient to allow 218 // frame::retrieve_receiver() to work. Currently they are expected 219 // to be byte offsets from the Java stack pointer for maximum code 220 // sharing between platforms. Note that currently biased locking 221 // will never cause Class instances to be biased but this code 222 // handles the static synchronized case as well. 223 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset; 224 ByteSize _compiled_synchronized_native_basic_lock_sp_offset; 225 226 friend class nmethodLocker; 227 228 // For native wrappers 229 nmethod(methodOop method, 230 int nmethod_size, 231 CodeOffsets* offsets, 232 CodeBuffer *code_buffer, 233 int frame_size, 234 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ 235 ByteSize basic_lock_sp_offset, /* synchronized natives only */ 236 OopMapSet* oop_maps); 237 238 #ifdef HAVE_DTRACE_H 239 // For native wrappers 240 nmethod(methodOop method, 241 int nmethod_size, 242 CodeOffsets* offsets, 243 CodeBuffer *code_buffer, 244 int frame_size); 245 #endif // def HAVE_DTRACE_H 246 247 // Creation support 248 nmethod(methodOop method, 249 int nmethod_size, 250 int compile_id, 251 int entry_bci, 252 CodeOffsets* offsets, 253 int orig_pc_offset, 254 DebugInformationRecorder *recorder, 255 Dependencies* dependencies, 256 CodeBuffer *code_buffer, 257 int frame_size, 258 OopMapSet* oop_maps, 259 ExceptionHandlerTable* handler_table, 260 ImplicitExceptionTable* nul_chk_table, 261 AbstractCompiler* compiler, 262 int comp_level); 263 264 // helper methods 265 void* operator new(size_t size, int nmethod_size); 266 267 const char* reloc_string_for(u_char* begin, u_char* end); 268 // Returns true if this thread changed the state of the nmethod or 269 // false if another thread performed the transition. 270 bool make_not_entrant_or_zombie(unsigned int state); 271 void inc_decompile_count(); 272 273 // Used to manipulate the exception cache 274 void add_exception_cache_entry(ExceptionCache* new_entry); 275 ExceptionCache* exception_cache_entry_for_exception(Handle exception); 276 277 // Inform external interfaces that a compiled method has been unloaded 278 void post_compiled_method_unload(); 279 280 // Initailize fields to their default values 281 void init_defaults(); 282 283 public: 284 // create nmethod with entry_bci 285 static nmethod* new_nmethod(methodHandle method, 286 int compile_id, 287 int entry_bci, 288 CodeOffsets* offsets, 289 int orig_pc_offset, 290 DebugInformationRecorder* recorder, 291 Dependencies* dependencies, 292 CodeBuffer *code_buffer, 293 int frame_size, 294 OopMapSet* oop_maps, 295 ExceptionHandlerTable* handler_table, 296 ImplicitExceptionTable* nul_chk_table, 297 AbstractCompiler* compiler, 298 int comp_level); 299 300 static nmethod* new_native_nmethod(methodHandle method, 301 CodeBuffer *code_buffer, 302 int vep_offset, 303 int frame_complete, 304 int frame_size, 305 ByteSize receiver_sp_offset, 306 ByteSize basic_lock_sp_offset, 307 OopMapSet* oop_maps); 308 309 #ifdef HAVE_DTRACE_H 310 // The method we generate for a dtrace probe has to look 311 // like an nmethod as far as the rest of the system is concerned 312 // which is somewhat unfortunate. 313 static nmethod* new_dtrace_nmethod(methodHandle method, 314 CodeBuffer *code_buffer, 315 int vep_offset, 316 int trap_offset, 317 int frame_complete, 318 int frame_size); 319 320 int trap_offset() const { return _trap_offset; } 321 address trap_address() const { return insts_begin() + _trap_offset; } 322 323 #endif // def HAVE_DTRACE_H 324 325 // accessors 326 methodOop method() const { return _method; } 327 AbstractCompiler* compiler() const { return _compiler; } 328 329 #ifndef PRODUCT 330 bool has_debug_info() const { return _has_debug_info; } 331 void set_has_debug_info(bool f) { _has_debug_info = false; } 332 #endif // NOT PRODUCT 333 334 // type info 335 bool is_nmethod() const { return true; } 336 bool is_java_method() const { return !method()->is_native(); } 337 bool is_native_method() const { return method()->is_native(); } 338 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } 339 340 bool is_compiled_by_c1() const; 341 bool is_compiled_by_c2() const; 342 bool is_compiled_by_shark() const; 343 344 // boundaries for different parts 345 address consts_begin () const { return header_begin() + _consts_offset ; } 346 address consts_end () const { return header_begin() + code_offset() ; } 347 address insts_begin () const { return header_begin() + code_offset() ; } 348 address insts_end () const { return header_begin() + _stub_offset ; } 349 address stub_begin () const { return header_begin() + _stub_offset ; } 350 address stub_end () const { return header_begin() + _oops_offset ; } 351 address exception_begin () const { return header_begin() + _exception_offset ; } 352 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } 353 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } 354 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 355 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 356 oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; } 357 358 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } 359 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 360 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 361 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 362 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 363 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 364 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 365 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 366 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 367 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 368 369 // Sizes 370 int consts_size () const { return consts_end () - consts_begin (); } 371 int insts_size () const { return insts_end () - insts_begin (); } 372 int stub_size () const { return stub_end () - stub_begin (); } 373 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 374 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } 375 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } 376 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 377 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } 378 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } 379 380 int total_size () const; 381 382 // Containment 383 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } 384 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); } 385 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } 386 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 387 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 388 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 389 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } 390 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } 391 392 // entry points 393 address entry_point() const { return _entry_point; } // normal entry point 394 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct 395 396 // flag accessing and manipulation 397 bool is_in_use() const { return _state == alive; } 398 bool is_alive() const { return _state == alive || _state == not_entrant; } 399 bool is_not_entrant() const { return _state == not_entrant; } 400 bool is_zombie() const { return _state == zombie; } 401 bool is_unloaded() const { return _state == unloaded; } 402 403 // Make the nmethod non entrant. The nmethod will continue to be 404 // alive. It is used when an uncommon trap happens. Returns true 405 // if this thread changed the state of the nmethod or false if 406 // another thread performed the transition. 407 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); } 408 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 409 410 // used by jvmti to track if the unload event has been reported 411 bool unload_reported() { return _unload_reported; } 412 void set_unload_reported() { _unload_reported = true; } 413 414 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; } 415 void mark_for_deoptimization() { _marked_for_deoptimization = true; } 416 417 void make_unloaded(BoolObjectClosure* is_alive, oop cause); 418 419 bool has_dependencies() { return dependencies_size() != 0; } 420 void flush_dependencies(BoolObjectClosure* is_alive); 421 bool has_flushed_dependencies() { return _has_flushed_dependencies; } 422 void set_has_flushed_dependencies() { 423 assert(!has_flushed_dependencies(), "should only happen once"); 424 _has_flushed_dependencies = 1; 425 } 426 427 bool is_marked_for_reclamation() const { return _marked_for_reclamation; } 428 void mark_for_reclamation() { _marked_for_reclamation = 1; } 429 430 bool has_unsafe_access() const { return _has_unsafe_access; } 431 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; } 432 433 bool has_method_handle_invokes() const { return _has_method_handle_invokes; } 434 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; } 435 436 bool is_speculatively_disconnected() const { return _speculatively_disconnected; } 437 void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; } 438 439 int comp_level() const { return _comp_level; } 440 441 // Support for oops in scopes and relocs: 442 // Note: index 0 is reserved for null. 443 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } 444 oop* oop_addr_at(int index) const { // for GC 445 // relocation indexes are biased by 1 (because 0 is reserved) 446 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); 447 assert(!_oops_are_stale, "oops are stale"); 448 return &oops_begin()[index - 1]; 449 } 450 451 void copy_oops(GrowableArray<jobject>* oops); 452 453 // Relocation support 454 private: 455 void fix_oop_relocations(address begin, address end, bool initialize_immediates); 456 inline void initialize_immediate_oop(oop* dest, jobject handle); 457 458 public: 459 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } 460 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } 461 462 bool is_at_poll_return(address pc); 463 bool is_at_poll_or_poll_return(address pc); 464 465 // Non-perm oop support 466 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } 467 protected: 468 enum { npl_on_list = 0x01, npl_marked = 0x10 }; 469 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; } 470 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } 471 // assertion-checking and pruning logic uses the bits of _scavenge_root_state 472 #ifndef PRODUCT 473 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; } 474 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; } 475 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; } 476 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. 477 #endif //PRODUCT 478 nmethod* scavenge_root_link() const { return _scavenge_root_link; } 479 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } 480 481 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; } 482 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; } 483 484 public: 485 486 // Sweeper support 487 long stack_traversal_mark() { return _stack_traversal_mark; } 488 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 489 490 // Exception cache support 491 ExceptionCache* exception_cache() const { return _exception_cache; } 492 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } 493 address handler_for_exception_and_pc(Handle exception, address pc); 494 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); 495 void remove_from_exception_cache(ExceptionCache* ec); 496 497 // implicit exceptions support 498 address continuation_for_implicit_exception(address pc); 499 500 // On-stack replacement support 501 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; } 502 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; } 503 void invalidate_osr_method(); 504 nmethod* osr_link() const { return _osr_link; } 505 void set_osr_link(nmethod *n) { _osr_link = n; } 506 507 // tells whether frames described by this nmethod can be deoptimized 508 // note: native wrappers cannot be deoptimized. 509 bool can_be_deoptimized() const { return is_java_method(); } 510 511 // Inline cache support 512 void clear_inline_caches(); 513 void cleanup_inline_caches(); 514 bool inlinecache_check_contains(address addr) const { 515 return (addr >= code_begin() && addr < verified_entry_point()); 516 } 517 518 // unlink and deallocate this nmethod 519 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not 520 // expected to use any other private methods/data in this class. 521 522 protected: 523 void flush(); 524 525 public: 526 // If returning true, it is unsafe to remove this nmethod even though it is a zombie 527 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint. 528 bool is_locked_by_vm() const { return _lock_count >0; } 529 530 // See comment at definition of _last_seen_on_stack 531 void mark_as_seen_on_stack(); 532 bool can_not_entrant_be_converted(); 533 534 // Evolution support. We make old (discarded) compiled methods point to new methodOops. 535 void set_method(methodOop method) { _method = method; } 536 537 // GC support 538 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, 539 bool unloading_occurred); 540 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive, 541 oop* root, bool unloading_occurred); 542 543 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, 544 OopClosure* f); 545 void oops_do(OopClosure* f) { oops_do(f, false); } 546 void oops_do(OopClosure* f, bool do_strong_roots_only); 547 bool detect_scavenge_root_oops(); 548 void verify_scavenge_root_oops() PRODUCT_RETURN; 549 550 bool test_set_oops_do_mark(); 551 static void oops_do_marking_prologue(); 552 static void oops_do_marking_epilogue(); 553 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } 554 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }) 555 556 // ScopeDesc for an instruction 557 ScopeDesc* scope_desc_at(address pc); 558 559 private: 560 ScopeDesc* scope_desc_in(address begin, address end); 561 562 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } 563 564 PcDesc* find_pc_desc_internal(address pc, bool approximate); 565 566 PcDesc* find_pc_desc(address pc, bool approximate) { 567 PcDesc* desc = _pc_desc_cache.last_pc_desc(); 568 if (desc != NULL && desc->pc_offset() == pc - code_begin()) { 569 return desc; 570 } 571 return find_pc_desc_internal(pc, approximate); 572 } 573 574 public: 575 // ScopeDesc retrieval operation 576 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } 577 // pc_desc_near returns the first PcDesc at or after the givne pc. 578 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } 579 580 public: 581 // copying of debugging information 582 void copy_scopes_pcs(PcDesc* pcs, int count); 583 void copy_scopes_data(address buffer, int size); 584 585 // Deopt 586 // Return true is the PC is one would expect if the frame is being deopted. 587 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); } 588 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); } 589 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); } 590 // Accessor/mutator for the original pc of a frame before a frame was deopted. 591 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } 592 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } 593 594 static address get_deopt_original_pc(const frame* fr); 595 596 // MethodHandle 597 bool is_method_handle_return(address return_pc); 598 599 // jvmti support: 600 void post_compiled_method_load_event(); 601 jmethodID get_and_cache_jmethod_id(); 602 603 // verify operations 604 void verify(); 605 void verify_scopes(); 606 void verify_interrupt_point(address interrupt_point); 607 608 // print compilation helper 609 static void print_compilation(outputStream *st, const char *method_name, const char *title, 610 methodOop method, bool is_blocking, int compile_id, int bci, int comp_level); 611 612 // printing support 613 void print() const; 614 void print_code(); 615 void print_relocations() PRODUCT_RETURN; 616 void print_pcs() PRODUCT_RETURN; 617 void print_scopes() PRODUCT_RETURN; 618 void print_dependencies() PRODUCT_RETURN; 619 void print_value_on(outputStream* st) const PRODUCT_RETURN; 620 void print_calls(outputStream* st) PRODUCT_RETURN; 621 void print_handler_table() PRODUCT_RETURN; 622 void print_nul_chk_table() PRODUCT_RETURN; 623 void print_nmethod(bool print_code); 624 625 // need to re-define this from CodeBlob else the overload hides it 626 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } 627 void print_on(outputStream* st, const char* title) const; 628 629 // Logging 630 void log_identity(xmlStream* log) const; 631 void log_new_nmethod() const; 632 void log_state_change() const; 633 634 // Prints block-level comments, including nmethod specific block labels: 635 virtual void print_block_comment(outputStream* stream, address block_begin) { 636 print_nmethod_labels(stream, block_begin); 637 CodeBlob::print_block_comment(stream, block_begin); 638 } 639 void print_nmethod_labels(outputStream* stream, address block_begin); 640 641 // Prints a comment for one native instruction (reloc info, pc desc) 642 void print_code_comment_on(outputStream* st, int column, address begin, address end); 643 static void print_statistics() PRODUCT_RETURN; 644 645 // Compiler task identification. Note that all OSR methods 646 // are numbered in an independent sequence if CICountOSR is true, 647 // and native method wrappers are also numbered independently if 648 // CICountNative is true. 649 int compile_id() const { return _compile_id; } 650 const char* compile_kind() const; 651 652 // For debugging 653 // CompiledIC* IC_at(char* p) const; 654 // PrimitiveIC* primitiveIC_at(char* p) const; 655 oop embeddedOop_at(address p); 656 657 // tells if any of this method's dependencies have been invalidated 658 // (this is expensive!) 659 bool check_all_dependencies(); 660 661 // tells if this compiled method is dependent on the given changes, 662 // and the changes have invalidated it 663 bool check_dependency_on(DepChange& changes); 664 665 // Evolution support. Tells if this compiled method is dependent on any of 666 // methods m() of class dependee, such that if m() in dependee is replaced, 667 // this compiled method will have to be deoptimized. 668 bool is_evol_dependent_on(klassOop dependee); 669 670 // Fast breakpoint support. Tells if this compiled method is 671 // dependent on the given method. Returns true if this nmethod 672 // corresponds to the given method as well. 673 bool is_dependent_on_method(methodOop dependee); 674 675 // is it ok to patch at address? 676 bool is_patchable_at(address instr_address); 677 678 // UseBiasedLocking support 679 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() { 680 return _compiled_synchronized_native_basic_lock_owner_sp_offset; 681 } 682 ByteSize compiled_synchronized_native_basic_lock_sp_offset() { 683 return _compiled_synchronized_native_basic_lock_sp_offset; 684 } 685 686 // support for code generation 687 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 688 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 689 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } 690 691 }; 692 693 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method 694 class nmethodLocker : public StackObj { 695 nmethod* _nm; 696 697 static void lock_nmethod(nmethod* nm); // note: nm can be NULL 698 static void unlock_nmethod(nmethod* nm); // (ditto) 699 700 public: 701 nmethodLocker(address pc); // derive nm from pc 702 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 703 nmethodLocker() { _nm = NULL; } 704 ~nmethodLocker() { unlock_nmethod(_nm); } 705 706 nmethod* code() { return _nm; } 707 void set_code(nmethod* new_nm) { 708 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. 709 _nm = new_nm; 710 lock_nmethod(_nm); 711 } 712 }; 713 714 #endif // SHARE_VM_CODE_NMETHOD_HPP