1 /* 2 * Copyright (c) 1997, 2011, 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 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 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver 224 // for non-static native wrapper frames. 225 ByteSize _native_receiver_sp_offset; 226 ByteSize _native_basic_lock_sp_offset; 227 228 friend class nmethodLocker; 229 230 // For native wrappers 231 nmethod(methodOop method, 232 int nmethod_size, 233 CodeOffsets* offsets, 234 CodeBuffer *code_buffer, 235 int frame_size, 236 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ 237 ByteSize basic_lock_sp_offset, /* synchronized natives only */ 238 OopMapSet* oop_maps); 239 240 #ifdef HAVE_DTRACE_H 241 // For native wrappers 242 nmethod(methodOop method, 243 int nmethod_size, 244 CodeOffsets* offsets, 245 CodeBuffer *code_buffer, 246 int frame_size); 247 #endif // def HAVE_DTRACE_H 248 249 // Creation support 250 nmethod(methodOop method, 251 int nmethod_size, 252 int compile_id, 253 int entry_bci, 254 CodeOffsets* offsets, 255 int orig_pc_offset, 256 DebugInformationRecorder *recorder, 257 Dependencies* dependencies, 258 CodeBuffer *code_buffer, 259 int frame_size, 260 OopMapSet* oop_maps, 261 ExceptionHandlerTable* handler_table, 262 ImplicitExceptionTable* nul_chk_table, 263 AbstractCompiler* compiler, 264 int comp_level); 265 266 // helper methods 267 void* operator new(size_t size, int nmethod_size); 268 269 const char* reloc_string_for(u_char* begin, u_char* end); 270 // Returns true if this thread changed the state of the nmethod or 271 // false if another thread performed the transition. 272 bool make_not_entrant_or_zombie(unsigned int state); 273 void inc_decompile_count(); 274 275 // Used to manipulate the exception cache 276 void add_exception_cache_entry(ExceptionCache* new_entry); 277 ExceptionCache* exception_cache_entry_for_exception(Handle exception); 278 279 // Inform external interfaces that a compiled method has been unloaded 280 void post_compiled_method_unload(); 281 282 // Initailize fields to their default values 283 void init_defaults(); 284 285 public: 286 // create nmethod with entry_bci 287 static nmethod* new_nmethod(methodHandle method, 288 int compile_id, 289 int entry_bci, 290 CodeOffsets* offsets, 291 int orig_pc_offset, 292 DebugInformationRecorder* recorder, 293 Dependencies* dependencies, 294 CodeBuffer *code_buffer, 295 int frame_size, 296 OopMapSet* oop_maps, 297 ExceptionHandlerTable* handler_table, 298 ImplicitExceptionTable* nul_chk_table, 299 AbstractCompiler* compiler, 300 int comp_level); 301 302 static nmethod* new_native_nmethod(methodHandle method, 303 CodeBuffer *code_buffer, 304 int vep_offset, 305 int frame_complete, 306 int frame_size, 307 ByteSize receiver_sp_offset, 308 ByteSize basic_lock_sp_offset, 309 OopMapSet* oop_maps); 310 311 #ifdef HAVE_DTRACE_H 312 // The method we generate for a dtrace probe has to look 313 // like an nmethod as far as the rest of the system is concerned 314 // which is somewhat unfortunate. 315 static nmethod* new_dtrace_nmethod(methodHandle method, 316 CodeBuffer *code_buffer, 317 int vep_offset, 318 int trap_offset, 319 int frame_complete, 320 int frame_size); 321 322 int trap_offset() const { return _trap_offset; } 323 address trap_address() const { return insts_begin() + _trap_offset; } 324 325 #endif // def HAVE_DTRACE_H 326 327 // accessors 328 methodOop method() const { return _method; } 329 AbstractCompiler* compiler() const { return _compiler; } 330 331 #ifndef PRODUCT 332 bool has_debug_info() const { return _has_debug_info; } 333 void set_has_debug_info(bool f) { _has_debug_info = false; } 334 #endif // NOT PRODUCT 335 336 // type info 337 bool is_nmethod() const { return true; } 338 bool is_java_method() const { return !method()->is_native(); } 339 bool is_native_method() const { return method()->is_native(); } 340 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } 341 342 bool is_compiled_by_c1() const; 343 bool is_compiled_by_c2() const; 344 bool is_compiled_by_shark() const; 345 346 // boundaries for different parts 347 address consts_begin () const { return header_begin() + _consts_offset ; } 348 address consts_end () const { return header_begin() + code_offset() ; } 349 address insts_begin () const { return header_begin() + code_offset() ; } 350 address insts_end () const { return header_begin() + _stub_offset ; } 351 address stub_begin () const { return header_begin() + _stub_offset ; } 352 address stub_end () const { return header_begin() + _oops_offset ; } 353 address exception_begin () const { return header_begin() + _exception_offset ; } 354 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } 355 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } 356 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 357 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 358 oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; } 359 360 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } 361 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 362 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 363 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 364 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 365 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 366 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 367 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 368 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 369 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 370 371 // Sizes 372 int consts_size () const { return consts_end () - consts_begin (); } 373 int insts_size () const { return insts_end () - insts_begin (); } 374 int stub_size () const { return stub_end () - stub_begin (); } 375 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 376 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } 377 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } 378 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 379 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } 380 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } 381 382 int total_size () const; 383 384 // Containment 385 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } 386 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); } 387 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } 388 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 389 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 390 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 391 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } 392 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } 393 394 // entry points 395 address entry_point() const { return _entry_point; } // normal entry point 396 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct 397 398 // flag accessing and manipulation 399 bool is_in_use() const { return _state == alive; } 400 bool is_alive() const { return _state == alive || _state == not_entrant; } 401 bool is_not_entrant() const { return _state == not_entrant; } 402 bool is_zombie() const { return _state == zombie; } 403 bool is_unloaded() const { return _state == unloaded; } 404 405 // Make the nmethod non entrant. The nmethod will continue to be 406 // alive. It is used when an uncommon trap happens. Returns true 407 // if this thread changed the state of the nmethod or false if 408 // another thread performed the transition. 409 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); } 410 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 411 412 // used by jvmti to track if the unload event has been reported 413 bool unload_reported() { return _unload_reported; } 414 void set_unload_reported() { _unload_reported = true; } 415 416 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; } 417 void mark_for_deoptimization() { _marked_for_deoptimization = true; } 418 419 void make_unloaded(BoolObjectClosure* is_alive, oop cause); 420 421 bool has_dependencies() { return dependencies_size() != 0; } 422 void flush_dependencies(BoolObjectClosure* is_alive); 423 bool has_flushed_dependencies() { return _has_flushed_dependencies; } 424 void set_has_flushed_dependencies() { 425 assert(!has_flushed_dependencies(), "should only happen once"); 426 _has_flushed_dependencies = 1; 427 } 428 429 bool is_marked_for_reclamation() const { return _marked_for_reclamation; } 430 void mark_for_reclamation() { _marked_for_reclamation = 1; } 431 432 bool has_unsafe_access() const { return _has_unsafe_access; } 433 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; } 434 435 bool has_method_handle_invokes() const { return _has_method_handle_invokes; } 436 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; } 437 438 bool is_speculatively_disconnected() const { return _speculatively_disconnected; } 439 void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; } 440 441 int comp_level() const { return _comp_level; } 442 443 // Support for oops in scopes and relocs: 444 // Note: index 0 is reserved for null. 445 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } 446 oop* oop_addr_at(int index) const { // for GC 447 // relocation indexes are biased by 1 (because 0 is reserved) 448 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); 449 assert(!_oops_are_stale, "oops are stale"); 450 return &oops_begin()[index - 1]; 451 } 452 453 void copy_oops(GrowableArray<jobject>* oops); 454 455 // Relocation support 456 private: 457 void fix_oop_relocations(address begin, address end, bool initialize_immediates); 458 inline void initialize_immediate_oop(oop* dest, jobject handle); 459 460 public: 461 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } 462 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } 463 464 bool is_at_poll_return(address pc); 465 bool is_at_poll_or_poll_return(address pc); 466 467 // Non-perm oop support 468 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } 469 protected: 470 enum { npl_on_list = 0x01, npl_marked = 0x10 }; 471 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; } 472 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } 473 // assertion-checking and pruning logic uses the bits of _scavenge_root_state 474 #ifndef PRODUCT 475 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; } 476 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; } 477 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; } 478 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. 479 #endif //PRODUCT 480 nmethod* scavenge_root_link() const { return _scavenge_root_link; } 481 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } 482 483 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; } 484 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; } 485 486 public: 487 488 // Sweeper support 489 long stack_traversal_mark() { return _stack_traversal_mark; } 490 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 491 492 // Exception cache support 493 ExceptionCache* exception_cache() const { return _exception_cache; } 494 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } 495 address handler_for_exception_and_pc(Handle exception, address pc); 496 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); 497 void remove_from_exception_cache(ExceptionCache* ec); 498 499 // implicit exceptions support 500 address continuation_for_implicit_exception(address pc); 501 502 // On-stack replacement support 503 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; } 504 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; } 505 void invalidate_osr_method(); 506 nmethod* osr_link() const { return _osr_link; } 507 void set_osr_link(nmethod *n) { _osr_link = n; } 508 509 // tells whether frames described by this nmethod can be deoptimized 510 // note: native wrappers cannot be deoptimized. 511 bool can_be_deoptimized() const { return is_java_method(); } 512 513 // Inline cache support 514 void clear_inline_caches(); 515 void cleanup_inline_caches(); 516 bool inlinecache_check_contains(address addr) const { 517 return (addr >= code_begin() && addr < verified_entry_point()); 518 } 519 520 // unlink and deallocate this nmethod 521 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not 522 // expected to use any other private methods/data in this class. 523 524 protected: 525 void flush(); 526 527 public: 528 // If returning true, it is unsafe to remove this nmethod even though it is a zombie 529 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint. 530 bool is_locked_by_vm() const { return _lock_count >0; } 531 532 // See comment at definition of _last_seen_on_stack 533 void mark_as_seen_on_stack(); 534 bool can_not_entrant_be_converted(); 535 536 // Evolution support. We make old (discarded) compiled methods point to new methodOops. 537 void set_method(methodOop method) { _method = method; } 538 539 // GC support 540 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, 541 bool unloading_occurred); 542 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive, 543 oop* root, bool unloading_occurred); 544 545 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, 546 OopClosure* f); 547 void oops_do(OopClosure* f) { oops_do(f, false); } 548 void oops_do(OopClosure* f, bool do_strong_roots_only); 549 bool detect_scavenge_root_oops(); 550 void verify_scavenge_root_oops() PRODUCT_RETURN; 551 552 bool test_set_oops_do_mark(); 553 static void oops_do_marking_prologue(); 554 static void oops_do_marking_epilogue(); 555 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } 556 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }) 557 558 // ScopeDesc for an instruction 559 ScopeDesc* scope_desc_at(address pc); 560 561 private: 562 ScopeDesc* scope_desc_in(address begin, address end); 563 564 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } 565 566 PcDesc* find_pc_desc_internal(address pc, bool approximate); 567 568 PcDesc* find_pc_desc(address pc, bool approximate) { 569 PcDesc* desc = _pc_desc_cache.last_pc_desc(); 570 if (desc != NULL && desc->pc_offset() == pc - code_begin()) { 571 return desc; 572 } 573 return find_pc_desc_internal(pc, approximate); 574 } 575 576 public: 577 // ScopeDesc retrieval operation 578 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } 579 // pc_desc_near returns the first PcDesc at or after the givne pc. 580 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } 581 582 public: 583 // copying of debugging information 584 void copy_scopes_pcs(PcDesc* pcs, int count); 585 void copy_scopes_data(address buffer, int size); 586 587 // Deopt 588 // Return true is the PC is one would expect if the frame is being deopted. 589 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); } 590 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); } 591 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); } 592 // Accessor/mutator for the original pc of a frame before a frame was deopted. 593 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } 594 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } 595 596 static address get_deopt_original_pc(const frame* fr); 597 598 // MethodHandle 599 bool is_method_handle_return(address return_pc); 600 601 // jvmti support: 602 void post_compiled_method_load_event(); 603 jmethodID get_and_cache_jmethod_id(); 604 605 // verify operations 606 void verify(); 607 void verify_scopes(); 608 void verify_interrupt_point(address interrupt_point); 609 610 // print compilation helper 611 static void print_compilation(outputStream *st, const char *method_name, const char *title, 612 methodOop method, bool is_blocking, int compile_id, int bci, int comp_level); 613 614 // printing support 615 void print() const; 616 void print_code(); 617 void print_relocations() PRODUCT_RETURN; 618 void print_pcs() PRODUCT_RETURN; 619 void print_scopes() PRODUCT_RETURN; 620 void print_dependencies() PRODUCT_RETURN; 621 void print_value_on(outputStream* st) const PRODUCT_RETURN; 622 void print_calls(outputStream* st) PRODUCT_RETURN; 623 void print_handler_table() PRODUCT_RETURN; 624 void print_nul_chk_table() PRODUCT_RETURN; 625 void print_nmethod(bool print_code); 626 627 // need to re-define this from CodeBlob else the overload hides it 628 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } 629 void print_on(outputStream* st, const char* title) const; 630 631 // Logging 632 void log_identity(xmlStream* log) const; 633 void log_new_nmethod() const; 634 void log_state_change() const; 635 636 // Prints block-level comments, including nmethod specific block labels: 637 virtual void print_block_comment(outputStream* stream, address block_begin) { 638 print_nmethod_labels(stream, block_begin); 639 CodeBlob::print_block_comment(stream, block_begin); 640 } 641 void print_nmethod_labels(outputStream* stream, address block_begin); 642 643 // Prints a comment for one native instruction (reloc info, pc desc) 644 void print_code_comment_on(outputStream* st, int column, address begin, address end); 645 static void print_statistics() PRODUCT_RETURN; 646 647 // Compiler task identification. Note that all OSR methods 648 // are numbered in an independent sequence if CICountOSR is true, 649 // and native method wrappers are also numbered independently if 650 // CICountNative is true. 651 int compile_id() const { return _compile_id; } 652 const char* compile_kind() const; 653 654 // For debugging 655 // CompiledIC* IC_at(char* p) const; 656 // PrimitiveIC* primitiveIC_at(char* p) const; 657 oop embeddedOop_at(address p); 658 659 // tells if any of this method's dependencies have been invalidated 660 // (this is expensive!) 661 bool check_all_dependencies(); 662 663 // tells if this compiled method is dependent on the given changes, 664 // and the changes have invalidated it 665 bool check_dependency_on(DepChange& changes); 666 667 // Evolution support. Tells if this compiled method is dependent on any of 668 // methods m() of class dependee, such that if m() in dependee is replaced, 669 // this compiled method will have to be deoptimized. 670 bool is_evol_dependent_on(klassOop dependee); 671 672 // Fast breakpoint support. Tells if this compiled method is 673 // dependent on the given method. Returns true if this nmethod 674 // corresponds to the given method as well. 675 bool is_dependent_on_method(methodOop dependee); 676 677 // is it ok to patch at address? 678 bool is_patchable_at(address instr_address); 679 680 // UseBiasedLocking support 681 ByteSize native_receiver_sp_offset() { 682 return _native_receiver_sp_offset; 683 } 684 ByteSize native_basic_lock_sp_offset() { 685 return _native_basic_lock_sp_offset; 686 } 687 688 // support for code generation 689 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 690 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 691 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } 692 693 }; 694 695 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method 696 class nmethodLocker : public StackObj { 697 nmethod* _nm; 698 699 public: 700 701 static void lock_nmethod(nmethod* nm); // note: nm can be NULL 702 static void unlock_nmethod(nmethod* nm); // (ditto) 703 704 nmethodLocker(address pc); // derive nm from pc 705 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 706 nmethodLocker() { _nm = NULL; } 707 ~nmethodLocker() { unlock_nmethod(_nm); } 708 709 nmethod* code() { return _nm; } 710 void set_code(nmethod* new_nm) { 711 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. 712 _nm = new_nm; 713 lock_nmethod(_nm); 714 } 715 }; 716 717 #endif // SHARE_VM_CODE_NMETHOD_HPP