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 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 age:4; // age (in # of sweep steps) 86 87 unsigned int state:2; // {alive, zombie, unloaded) 88 89 unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap? 90 unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures 91 unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies 92 unsigned int markedForReclamation:1; // Used by NMethodSweeper 93 94 unsigned int has_unsafe_access:1; // May fault due to unsafe access. 95 unsigned int has_method_handle_invokes:1; // Has this method MethodHandle invokes? 96 97 unsigned int speculatively_disconnected:1; // Marked for potential unload 98 99 void clear(); 100 }; 101 102 103 // A nmethod contains: 104 // - header (the nmethod structure) 105 // [Relocation] 106 // - relocation information 107 // - constant part (doubles, longs and floats used in nmethod) 108 // - oop table 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 bool is_compiled_by_shark() const; 342 343 // boundaries for different parts 344 address code_begin () const { return _entry_point; } 345 address code_end () const { return header_begin() + _stub_offset ; } 346 address exception_begin () const { return header_begin() + _exception_offset ; } 347 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } 348 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } 349 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 350 address stub_begin () const { return header_begin() + _stub_offset ; } 351 address stub_end () const { return header_begin() + _consts_offset ; } 352 address consts_begin () const { return header_begin() + _consts_offset ; } 353 address consts_end () const { return header_begin() + _oops_offset ; } 354 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 355 oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; } 356 357 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } 358 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 359 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 360 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 361 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 362 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 363 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 364 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 365 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 366 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 367 368 // Sizes 369 int code_size () const { return code_end () - code_begin (); } 370 int stub_size () const { return stub_end () - stub_begin (); } 371 int consts_size () const { return consts_end () - consts_begin (); } 372 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 373 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } 374 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } 375 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 376 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } 377 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } 378 379 int total_size () const; 380 381 // Containment 382 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); } 383 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } 384 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } 385 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 386 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 387 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 388 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } 389 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } 390 391 // entry points 392 address entry_point() const { return _entry_point; } // normal entry point 393 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct 394 395 // flag accessing and manipulation 396 bool is_in_use() const { return flags.state == alive; } 397 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; } 398 bool is_not_entrant() const { return flags.state == not_entrant; } 399 bool is_zombie() const { return flags.state == zombie; } 400 bool is_unloaded() const { return flags.state == unloaded; } 401 402 // Make the nmethod non entrant. The nmethod will continue to be 403 // alive. It is used when an uncommon trap happens. Returns true 404 // if this thread changed the state of the nmethod or false if 405 // another thread performed the transition. 406 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); } 407 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 408 409 // used by jvmti to track if the unload event has been reported 410 bool unload_reported() { return _unload_reported; } 411 void set_unload_reported() { _unload_reported = true; } 412 413 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; } 414 void mark_for_deoptimization() { _markedForDeoptimization = true; } 415 416 void make_unloaded(BoolObjectClosure* is_alive, oop cause); 417 418 bool has_dependencies() { return dependencies_size() != 0; } 419 void flush_dependencies(BoolObjectClosure* is_alive); 420 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; } 421 void set_has_flushed_dependencies() { 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() { flags.markedForReclamation = 1; } 428 void unmark_for_reclamation() { 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 comp_level() const { return _comp_level; } 440 441 int version() const { return flags.version; } 442 void set_version(int v); 443 444 // Support for oops in scopes and relocs: 445 // Note: index 0 is reserved for null. 446 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } 447 oop* oop_addr_at(int index) const { // for GC 448 // relocation indexes are biased by 1 (because 0 is reserved) 449 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); 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 >= instructions_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 - instructions_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(); 603 604 // verify operations 605 void verify(); 606 void verify_scopes(); 607 void verify_interrupt_point(address interrupt_point); 608 609 // printing support 610 void print() const; 611 void print_code(); 612 void print_relocations() PRODUCT_RETURN; 613 void print_pcs() PRODUCT_RETURN; 614 void print_scopes() PRODUCT_RETURN; 615 void print_dependencies() PRODUCT_RETURN; 616 void print_value_on(outputStream* st) const PRODUCT_RETURN; 617 void print_calls(outputStream* st) PRODUCT_RETURN; 618 void print_handler_table() PRODUCT_RETURN; 619 void print_nul_chk_table() PRODUCT_RETURN; 620 void print_nmethod(bool print_code); 621 622 void print_on(outputStream* st, const char* title) const; 623 624 // Logging 625 void log_identity(xmlStream* log) const; 626 void log_new_nmethod() const; 627 void log_state_change() const; 628 629 // Prints block-level comments, including nmethod specific block labels: 630 virtual void print_block_comment(outputStream* stream, address block_begin) { 631 print_nmethod_labels(stream, block_begin); 632 CodeBlob::print_block_comment(stream, block_begin); 633 } 634 void print_nmethod_labels(outputStream* stream, address block_begin); 635 636 // Prints a comment for one native instruction (reloc info, pc desc) 637 void print_code_comment_on(outputStream* st, int column, address begin, address end); 638 static void print_statistics() PRODUCT_RETURN; 639 640 // Compiler task identification. Note that all OSR methods 641 // are numbered in an independent sequence if CICountOSR is true, 642 // and native method wrappers are also numbered independently if 643 // CICountNative is true. 644 int compile_id() const { return _compile_id; } 645 const char* compile_kind() const; 646 647 // For debugging 648 // CompiledIC* IC_at(char* p) const; 649 // PrimitiveIC* primitiveIC_at(char* p) const; 650 oop embeddedOop_at(address p); 651 652 // tells if any of this method's dependencies have been invalidated 653 // (this is expensive!) 654 bool check_all_dependencies(); 655 656 // tells if this compiled method is dependent on the given changes, 657 // and the changes have invalidated it 658 bool check_dependency_on(DepChange& changes); 659 660 // Evolution support. Tells if this compiled method is dependent on any of 661 // methods m() of class dependee, such that if m() in dependee is replaced, 662 // this compiled method will have to be deoptimized. 663 bool is_evol_dependent_on(klassOop dependee); 664 665 // Fast breakpoint support. Tells if this compiled method is 666 // dependent on the given method. Returns true if this nmethod 667 // corresponds to the given method as well. 668 bool is_dependent_on_method(methodOop dependee); 669 670 // is it ok to patch at address? 671 bool is_patchable_at(address instr_address); 672 673 // UseBiasedLocking support 674 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() { 675 return _compiled_synchronized_native_basic_lock_owner_sp_offset; 676 } 677 ByteSize compiled_synchronized_native_basic_lock_sp_offset() { 678 return _compiled_synchronized_native_basic_lock_sp_offset; 679 } 680 681 // support for code generation 682 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 683 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 684 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } 685 686 }; 687 688 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method 689 class nmethodLocker : public StackObj { 690 nmethod* _nm; 691 692 static void lock_nmethod(nmethod* nm); // note: nm can be NULL 693 static void unlock_nmethod(nmethod* nm); // (ditto) 694 695 public: 696 nmethodLocker(address pc); // derive nm from pc 697 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 698 nmethodLocker() { _nm = NULL; } 699 ~nmethodLocker() { unlock_nmethod(_nm); } 700 701 nmethod* code() { return _nm; } 702 void set_code(nmethod* new_nm) { 703 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. 704 _nm = new_nm; 705 lock_nmethod(_nm); 706 } 707 };