1 /* 2 * Copyright 1997-2010 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 // This class is used internally by nmethods, to cache 26 // exception/pc/handler information. 27 28 class 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 65 class 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 struct nmFlags { 83 friend class VMStructs; 84 unsigned int version:8; // version number (0 = first version) 85 unsigned int level:4; // optimization level 86 unsigned int age:4; // age (in # of sweep steps) 87 88 unsigned int state:2; // {alive, zombie, unloaded) 89 90 unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap? 91 unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures 92 unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies 93 unsigned int markedForReclamation:1; // Used by NMethodSweeper 94 95 unsigned int has_unsafe_access:1; // May fault due to unsafe access. 96 unsigned int has_method_handle_invokes:1; // Has this method MethodHandle invokes? 97 98 unsigned int speculatively_disconnected:1; // Marked for potential unload 99 100 void clear(); 101 }; 102 103 104 // A nmethod contains: 105 // - header (the nmethod structure) 106 // [Relocation] 107 // - relocation information 108 // - constant part (doubles, longs and floats used in nmethod) 109 // [Code] 110 // - code body 111 // - exception handler 112 // - stub code 113 // [Debugging information] 114 // - oop array 115 // - data array 116 // - pcs 117 // [Exception handler table] 118 // - handler entry point array 119 // [Implicit Null Pointer exception table] 120 // - implicit null table array 121 122 class Dependencies; 123 class ExceptionHandlerTable; 124 class ImplicitExceptionTable; 125 class AbstractCompiler; 126 class xmlStream; 127 128 class nmethod : public CodeBlob { 129 friend class VMStructs; 130 friend class NMethodSweeper; 131 friend class CodeCache; // non-perm oops 132 private: 133 // Shared fields for all nmethod's 134 static int _zombie_instruction_size; 135 136 methodOop _method; 137 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method 138 139 // To support simple linked-list chaining of nmethods: 140 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head 141 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods 142 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect 143 144 static nmethod* volatile _oops_do_mark_nmethods; 145 nmethod* volatile _oops_do_mark_link; 146 147 AbstractCompiler* _compiler; // The compiler which compiled this nmethod 148 149 // Offsets for different nmethod parts 150 int _exception_offset; 151 // All deoptee's will resume execution at this location described by 152 // this offset. 153 int _deoptimize_offset; 154 // All deoptee's at a MethodHandle call site will resume execution 155 // at this location described by this offset. 156 int _deoptimize_mh_offset; 157 // Offset of the unwind handler if it exists 158 int _unwind_handler_offset; 159 160 #ifdef HAVE_DTRACE_H 161 int _trap_offset; 162 #endif // def HAVE_DTRACE_H 163 int _stub_offset; 164 int _consts_offset; 165 int _oops_offset; // offset to where embedded oop table begins (inside data) 166 int _scopes_data_offset; 167 int _scopes_pcs_offset; 168 int _dependencies_offset; 169 int _handler_table_offset; 170 int _nul_chk_table_offset; 171 int _nmethod_end_offset; 172 173 // location in frame (offset for sp) that deopt can store the original 174 // pc during a deopt. 175 int _orig_pc_offset; 176 177 int _compile_id; // which compilation made this nmethod 178 int _comp_level; // compilation level 179 180 // offsets for entry points 181 address _entry_point; // entry point with class check 182 address _verified_entry_point; // entry point without class check 183 address _osr_entry_point; // entry point for on stack replacement 184 185 nmFlags flags; // various flags to keep track of nmethod state 186 bool _markedForDeoptimization; // Used for stack deoptimization 187 enum { alive = 0, 188 not_entrant = 1, // uncommon trap has happened but activations may still exist 189 zombie = 2, 190 unloaded = 3 }; 191 192 // used by jvmti to track if an unload event has been posted for this nmethod. 193 bool _unload_reported; 194 195 jbyte _scavenge_root_state; 196 197 NOT_PRODUCT(bool _has_debug_info; ) 198 199 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed) 200 jint _lock_count; 201 202 // not_entrant method removal. Each mark_sweep pass will update 203 // this mark to current sweep invocation count if it is seen on the 204 // stack. An not_entrant method can be removed when there is no 205 // more activations, i.e., when the _stack_traversal_mark is less than 206 // current sweep traversal index. 207 long _stack_traversal_mark; 208 209 ExceptionCache *_exception_cache; 210 PcDescCache _pc_desc_cache; 211 212 // These are only used for compiled synchronized native methods to 213 // locate the owner and stack slot for the BasicLock so that we can 214 // properly revoke the bias of the owner if necessary. They are 215 // needed because there is no debug information for compiled native 216 // wrappers and the oop maps are insufficient to allow 217 // frame::retrieve_receiver() to work. Currently they are expected 218 // to be byte offsets from the Java stack pointer for maximum code 219 // sharing between platforms. Note that currently biased locking 220 // will never cause Class instances to be biased but this code 221 // handles the static synchronized case as well. 222 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset; 223 ByteSize _compiled_synchronized_native_basic_lock_sp_offset; 224 225 friend class nmethodLocker; 226 227 // For native wrappers 228 nmethod(methodOop method, 229 int nmethod_size, 230 CodeOffsets* offsets, 231 CodeBuffer *code_buffer, 232 int frame_size, 233 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ 234 ByteSize basic_lock_sp_offset, /* synchronized natives only */ 235 OopMapSet* oop_maps); 236 237 #ifdef HAVE_DTRACE_H 238 // For native wrappers 239 nmethod(methodOop method, 240 int nmethod_size, 241 CodeOffsets* offsets, 242 CodeBuffer *code_buffer, 243 int frame_size); 244 #endif // def HAVE_DTRACE_H 245 246 // Creation support 247 nmethod(methodOop method, 248 int nmethod_size, 249 int compile_id, 250 int entry_bci, 251 CodeOffsets* offsets, 252 int orig_pc_offset, 253 DebugInformationRecorder *recorder, 254 Dependencies* dependencies, 255 CodeBuffer *code_buffer, 256 int frame_size, 257 OopMapSet* oop_maps, 258 ExceptionHandlerTable* handler_table, 259 ImplicitExceptionTable* nul_chk_table, 260 AbstractCompiler* compiler, 261 int comp_level); 262 263 // helper methods 264 void* operator new(size_t size, int nmethod_size); 265 266 const char* reloc_string_for(u_char* begin, u_char* end); 267 // Returns true if this thread changed the state of the nmethod or 268 // false if another thread performed the transition. 269 bool make_not_entrant_or_zombie(unsigned int state); 270 void inc_decompile_count(); 271 272 // used to check that writes to nmFlags are done consistently. 273 static void check_safepoint() PRODUCT_RETURN; 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 inline void post_compiled_method_unload(); 281 282 public: 283 // create nmethod with entry_bci 284 static nmethod* new_nmethod(methodHandle method, 285 int compile_id, 286 int entry_bci, 287 CodeOffsets* offsets, 288 int orig_pc_offset, 289 DebugInformationRecorder* recorder, 290 Dependencies* dependencies, 291 CodeBuffer *code_buffer, 292 int frame_size, 293 OopMapSet* oop_maps, 294 ExceptionHandlerTable* handler_table, 295 ImplicitExceptionTable* nul_chk_table, 296 AbstractCompiler* compiler, 297 int comp_level); 298 299 static nmethod* new_native_nmethod(methodHandle method, 300 CodeBuffer *code_buffer, 301 int vep_offset, 302 int frame_complete, 303 int frame_size, 304 ByteSize receiver_sp_offset, 305 ByteSize basic_lock_sp_offset, 306 OopMapSet* oop_maps); 307 308 #ifdef HAVE_DTRACE_H 309 // The method we generate for a dtrace probe has to look 310 // like an nmethod as far as the rest of the system is concerned 311 // which is somewhat unfortunate. 312 static nmethod* new_dtrace_nmethod(methodHandle method, 313 CodeBuffer *code_buffer, 314 int vep_offset, 315 int trap_offset, 316 int frame_complete, 317 int frame_size); 318 319 int trap_offset() const { return _trap_offset; } 320 address trap_address() const { return code_begin() + _trap_offset; } 321 322 #endif // def HAVE_DTRACE_H 323 324 // accessors 325 methodOop method() const { return _method; } 326 AbstractCompiler* compiler() const { return _compiler; } 327 328 #ifndef PRODUCT 329 bool has_debug_info() const { return _has_debug_info; } 330 void set_has_debug_info(bool f) { _has_debug_info = false; } 331 #endif // NOT PRODUCT 332 333 // type info 334 bool is_nmethod() const { return true; } 335 bool is_java_method() const { return !method()->is_native(); } 336 bool is_native_method() const { return method()->is_native(); } 337 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } 338 339 bool is_compiled_by_c1() const; 340 bool is_compiled_by_c2() const; 341 342 // boundaries for different parts 343 address code_begin () const { return _entry_point; } 344 address code_end () const { return header_begin() + _stub_offset ; } 345 address exception_begin () const { return header_begin() + _exception_offset ; } 346 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } 347 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } 348 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 349 address stub_begin () const { return header_begin() + _stub_offset ; } 350 address stub_end () const { return header_begin() + _consts_offset ; } 351 address consts_begin () const { return header_begin() + _consts_offset ; } 352 address consts_end () const { return header_begin() + _oops_offset ; } 353 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 354 oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; } 355 356 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } 357 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 358 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 359 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 360 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 361 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 362 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 363 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 364 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 365 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 366 367 // Sizes 368 int code_size () const { return code_end () - code_begin (); } 369 int stub_size () const { return stub_end () - stub_begin (); } 370 int consts_size () const { return consts_end () - consts_begin (); } 371 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 372 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } 373 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } 374 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 375 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } 376 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } 377 378 int total_size () const; 379 380 // Containment 381 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); } 382 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } 383 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } 384 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 385 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 386 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 387 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } 388 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } 389 390 // entry points 391 address entry_point() const { return _entry_point; } // normal entry point 392 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct 393 394 // flag accessing and manipulation 395 bool is_in_use() const { return flags.state == alive; } 396 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; } 397 bool is_not_entrant() const { return flags.state == not_entrant; } 398 bool is_zombie() const { return flags.state == zombie; } 399 bool is_unloaded() const { return flags.state == unloaded; } 400 401 // Make the nmethod non entrant. The nmethod will continue to be 402 // alive. It is used when an uncommon trap happens. Returns true 403 // if this thread changed the state of the nmethod or false if 404 // another thread performed the transition. 405 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); } 406 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 407 408 // used by jvmti to track if the unload event has been reported 409 bool unload_reported() { return _unload_reported; } 410 void set_unload_reported() { _unload_reported = true; } 411 412 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; } 413 void mark_for_deoptimization() { _markedForDeoptimization = true; } 414 415 void make_unloaded(BoolObjectClosure* is_alive, oop cause); 416 417 bool has_dependencies() { return dependencies_size() != 0; } 418 void flush_dependencies(BoolObjectClosure* is_alive); 419 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; } 420 void set_has_flushed_dependencies() { 421 check_safepoint(); 422 assert(!has_flushed_dependencies(), "should only happen once"); 423 flags.hasFlushedDependencies = 1; 424 } 425 426 bool is_marked_for_reclamation() const { return flags.markedForReclamation; } 427 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; } 428 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; } 429 430 bool has_unsafe_access() const { return flags.has_unsafe_access; } 431 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; } 432 433 bool has_method_handle_invokes() const { return flags.has_method_handle_invokes; } 434 void set_has_method_handle_invokes(bool z) { flags.has_method_handle_invokes = z; } 435 436 bool is_speculatively_disconnected() const { return flags.speculatively_disconnected; } 437 void set_speculatively_disconnected(bool z) { flags.speculatively_disconnected = z; } 438 439 int level() const { return flags.level; } 440 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; } 441 442 int comp_level() const { return _comp_level; } 443 444 int version() const { return flags.version; } 445 void set_version(int v); 446 447 // Support for oops in scopes and relocs: 448 // Note: index 0 is reserved for null. 449 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } 450 oop* oop_addr_at(int index) const { // for GC 451 // relocation indexes are biased by 1 (because 0 is reserved) 452 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); 453 return &oops_begin()[index - 1]; 454 } 455 456 void copy_oops(GrowableArray<jobject>* oops); 457 458 // Relocation support 459 private: 460 void fix_oop_relocations(address begin, address end, bool initialize_immediates); 461 inline void initialize_immediate_oop(oop* dest, jobject handle); 462 463 public: 464 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } 465 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } 466 467 bool is_at_poll_return(address pc); 468 bool is_at_poll_or_poll_return(address pc); 469 470 // Non-perm oop support 471 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } 472 protected: 473 enum { npl_on_list = 0x01, npl_marked = 0x10 }; 474 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; } 475 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } 476 // assertion-checking and pruning logic uses the bits of _scavenge_root_state 477 #ifndef PRODUCT 478 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; } 479 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; } 480 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; } 481 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. 482 #endif //PRODUCT 483 nmethod* scavenge_root_link() const { return _scavenge_root_link; } 484 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } 485 486 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; } 487 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; } 488 489 public: 490 491 // Sweeper support 492 long stack_traversal_mark() { return _stack_traversal_mark; } 493 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 494 495 // Exception cache support 496 ExceptionCache* exception_cache() const { return _exception_cache; } 497 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } 498 address handler_for_exception_and_pc(Handle exception, address pc); 499 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); 500 void remove_from_exception_cache(ExceptionCache* ec); 501 502 // implicit exceptions support 503 address continuation_for_implicit_exception(address pc); 504 505 // On-stack replacement support 506 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; } 507 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; } 508 void invalidate_osr_method(); 509 nmethod* osr_link() const { return _osr_link; } 510 void set_osr_link(nmethod *n) { _osr_link = n; } 511 512 // tells whether frames described by this nmethod can be deoptimized 513 // note: native wrappers cannot be deoptimized. 514 bool can_be_deoptimized() const { return is_java_method(); } 515 516 // Inline cache support 517 void clear_inline_caches(); 518 void cleanup_inline_caches(); 519 bool inlinecache_check_contains(address addr) const { 520 return (addr >= instructions_begin() && addr < verified_entry_point()); 521 } 522 523 // unlink and deallocate this nmethod 524 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not 525 // expected to use any other private methods/data in this class. 526 527 protected: 528 void flush(); 529 530 public: 531 // If returning true, it is unsafe to remove this nmethod even though it is a zombie 532 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint. 533 bool is_locked_by_vm() const { return _lock_count >0; } 534 535 // See comment at definition of _last_seen_on_stack 536 void mark_as_seen_on_stack(); 537 bool can_not_entrant_be_converted(); 538 539 // Evolution support. We make old (discarded) compiled methods point to new methodOops. 540 void set_method(methodOop method) { _method = method; } 541 542 // GC support 543 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, 544 bool unloading_occurred); 545 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive, 546 oop* root, bool unloading_occurred); 547 548 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, 549 OopClosure* f); 550 void oops_do(OopClosure* f) { oops_do(f, false); } 551 void oops_do(OopClosure* f, bool do_strong_roots_only); 552 bool detect_scavenge_root_oops(); 553 void verify_scavenge_root_oops() PRODUCT_RETURN; 554 555 bool test_set_oops_do_mark(); 556 static void oops_do_marking_prologue(); 557 static void oops_do_marking_epilogue(); 558 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } 559 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }) 560 561 // ScopeDesc for an instruction 562 ScopeDesc* scope_desc_at(address pc); 563 564 private: 565 ScopeDesc* scope_desc_in(address begin, address end); 566 567 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } 568 569 PcDesc* find_pc_desc_internal(address pc, bool approximate); 570 571 PcDesc* find_pc_desc(address pc, bool approximate) { 572 PcDesc* desc = _pc_desc_cache.last_pc_desc(); 573 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) { 574 return desc; 575 } 576 return find_pc_desc_internal(pc, approximate); 577 } 578 579 public: 580 // ScopeDesc retrieval operation 581 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } 582 // pc_desc_near returns the first PcDesc at or after the givne pc. 583 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } 584 585 public: 586 // copying of debugging information 587 void copy_scopes_pcs(PcDesc* pcs, int count); 588 void copy_scopes_data(address buffer, int size); 589 590 // Deopt 591 // Return true is the PC is one would expect if the frame is being deopted. 592 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); } 593 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); } 594 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); } 595 // Accessor/mutator for the original pc of a frame before a frame was deopted. 596 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } 597 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } 598 599 static address get_deopt_original_pc(const frame* fr); 600 601 // MethodHandle 602 bool is_method_handle_return(address return_pc); 603 604 // jvmti support: 605 void post_compiled_method_load_event(); 606 607 // verify operations 608 void verify(); 609 void verify_scopes(); 610 void verify_interrupt_point(address interrupt_point); 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 void print_on(outputStream* st, const char* title) const; 626 627 // Logging 628 void log_identity(xmlStream* log) const; 629 void log_new_nmethod() const; 630 void log_state_change() const; 631 632 // Prints block-level comments, including nmethod specific block labels: 633 virtual void print_block_comment(outputStream* stream, address block_begin) { 634 print_nmethod_labels(stream, block_begin); 635 CodeBlob::print_block_comment(stream, block_begin); 636 } 637 void print_nmethod_labels(outputStream* stream, address block_begin); 638 639 // Prints a comment for one native instruction (reloc info, pc desc) 640 void print_code_comment_on(outputStream* st, int column, address begin, address end); 641 static void print_statistics() PRODUCT_RETURN; 642 643 // Compiler task identification. Note that all OSR methods 644 // are numbered in an independent sequence if CICountOSR is true, 645 // and native method wrappers are also numbered independently if 646 // CICountNative is true. 647 int compile_id() const { return _compile_id; } 648 const char* compile_kind() const; 649 650 // For debugging 651 // CompiledIC* IC_at(char* p) const; 652 // PrimitiveIC* primitiveIC_at(char* p) const; 653 oop embeddedOop_at(address p); 654 655 // tells if any of this method's dependencies have been invalidated 656 // (this is expensive!) 657 bool check_all_dependencies(); 658 659 // tells if this compiled method is dependent on the given changes, 660 // and the changes have invalidated it 661 bool check_dependency_on(DepChange& changes); 662 663 // Evolution support. Tells if this compiled method is dependent on any of 664 // methods m() of class dependee, such that if m() in dependee is replaced, 665 // this compiled method will have to be deoptimized. 666 bool is_evol_dependent_on(klassOop dependee); 667 668 // Fast breakpoint support. Tells if this compiled method is 669 // dependent on the given method. Returns true if this nmethod 670 // corresponds to the given method as well. 671 bool is_dependent_on_method(methodOop dependee); 672 673 // is it ok to patch at address? 674 bool is_patchable_at(address instr_address); 675 676 // UseBiasedLocking support 677 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() { 678 return _compiled_synchronized_native_basic_lock_owner_sp_offset; 679 } 680 ByteSize compiled_synchronized_native_basic_lock_sp_offset() { 681 return _compiled_synchronized_native_basic_lock_sp_offset; 682 } 683 684 // support for code generation 685 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 686 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 687 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } 688 689 }; 690 691 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method 692 class nmethodLocker : public StackObj { 693 nmethod* _nm; 694 695 static void lock_nmethod(nmethod* nm); // note: nm can be NULL 696 static void unlock_nmethod(nmethod* nm); // (ditto) 697 698 public: 699 nmethodLocker(address pc); // derive nm from pc 700 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 701 nmethodLocker() { _nm = NULL; } 702 ~nmethodLocker() { unlock_nmethod(_nm); } 703 704 nmethod* code() { return _nm; } 705 void set_code(nmethod* new_nm) { 706 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. 707 _nm = new_nm; 708 lock_nmethod(_nm); 709 } 710 };