1 /* 2 * Copyright (c) 1997, 2013, 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 #include "oops/metadata.hpp" 31 32 // This class is used internally by nmethods, to cache 33 // exception/pc/handler information. 34 35 class ExceptionCache : public CHeapObj<mtCode> { 36 friend class VMStructs; 37 private: 38 enum { cache_size = 16 }; 39 Klass* _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 Klass* exception_type() { return _exception_type; } 57 ExceptionCache* next() { return _next; } 58 void set_next(ExceptionCache *ec) { _next = ec; } 59 60 address match(Handle exception, address pc); 61 bool match_exception_with_space(Handle exception) ; 62 address test_address(address addr); 63 bool add_address_and_handler(address addr, address handler) ; 64 }; 65 66 67 // cache pc descs found in earlier inquiries 68 class PcDescCache VALUE_OBJ_CLASS_SPEC { 69 friend class VMStructs; 70 private: 71 enum { cache_size = 4 }; 72 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found 73 public: 74 PcDescCache() { debug_only(_pc_descs[0] = NULL); } 75 void reset_to(PcDesc* initial_pc_desc); 76 PcDesc* find_pc_desc(int pc_offset, bool approximate); 77 void add_pc_desc(PcDesc* pc_desc); 78 PcDesc* last_pc_desc() { return _pc_descs[0]; } 79 }; 80 81 82 // nmethods (native methods) are the compiled code versions of Java methods. 83 // 84 // An nmethod contains: 85 // - header (the nmethod structure) 86 // [Relocation] 87 // - relocation information 88 // - constant part (doubles, longs and floats used in nmethod) 89 // - oop table 90 // [Code] 91 // - code body 92 // - exception handler 93 // - stub code 94 // [Debugging information] 95 // - oop array 96 // - data array 97 // - pcs 98 // [Exception handler table] 99 // - handler entry point array 100 // [Implicit Null Pointer exception table] 101 // - implicit null table array 102 103 class Dependencies; 104 class ExceptionHandlerTable; 105 class ImplicitExceptionTable; 106 class AbstractCompiler; 107 class xmlStream; 108 109 class nmethod : public CodeBlob { 110 friend class VMStructs; 111 friend class NMethodSweeper; 112 friend class CodeCache; // scavengable oops 113 private: 114 // Shared fields for all nmethod's 115 Method* _method; 116 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method 117 jmethodID _jmethod_id; // Cache of method()->jmethod_id() 118 119 // To support simple linked-list chaining of nmethods: 120 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head 121 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods 122 123 static nmethod* volatile _oops_do_mark_nmethods; 124 nmethod* volatile _oops_do_mark_link; 125 126 AbstractCompiler* _compiler; // The compiler which compiled this nmethod 127 128 // offsets for entry points 129 address _entry_point; // entry point with class check 130 address _verified_entry_point; // entry point without class check 131 address _osr_entry_point; // entry point for on stack replacement 132 133 // Offsets for different nmethod parts 134 int _exception_offset; 135 // All deoptee's will resume execution at this location described by 136 // this offset. 137 int _deoptimize_offset; 138 // All deoptee's at a MethodHandle call site will resume execution 139 // at this location described by this offset. 140 int _deoptimize_mh_offset; 141 // Offset of the unwind handler if it exists 142 int _unwind_handler_offset; 143 144 #ifdef HAVE_DTRACE_H 145 int _trap_offset; 146 #endif // def HAVE_DTRACE_H 147 int _consts_offset; 148 int _stub_offset; 149 int _oops_offset; // offset to where embedded oop table begins (inside data) 150 int _metadata_offset; // embedded meta data table 151 int _scopes_data_offset; 152 int _scopes_pcs_offset; 153 int _dependencies_offset; 154 int _handler_table_offset; 155 int _nul_chk_table_offset; 156 int _nmethod_end_offset; 157 158 // location in frame (offset for sp) that deopt can store the original 159 // pc during a deopt. 160 int _orig_pc_offset; 161 162 int _compile_id; // which compilation made this nmethod 163 int _comp_level; // compilation level 164 165 // protected by CodeCache_lock 166 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) 167 168 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper) 169 bool _marked_for_deoptimization; // Used for stack deoptimization 170 171 // used by jvmti to track if an unload event has been posted for this nmethod. 172 bool _unload_reported; 173 174 // set during construction 175 unsigned int _has_unsafe_access:1; // May fault due to unsafe access. 176 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes? 177 unsigned int _lazy_critical_native:1; // Lazy JNI critical native 178 unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints 179 180 // Protected by Patching_lock 181 volatile unsigned char _state; // {alive, not_entrant, zombie, unloaded} 182 183 #ifdef ASSERT 184 bool _oops_are_stale; // indicates that it's no longer safe to access oops section 185 #endif 186 187 enum { in_use = 0, // executable nmethod 188 not_entrant = 1, // marked for deoptimization but activations may still exist, 189 // will be transformed to zombie when all activations are gone 190 zombie = 2, // no activations exist, nmethod is ready for purge 191 unloaded = 3 }; // there should be no activations, should not be called, 192 // will be transformed to zombie immediately 193 194 jbyte _scavenge_root_state; 195 196 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed 197 // and is not made into a zombie. However, once the nmethod is made into 198 // a zombie, it will be locked one final time if CompiledMethodUnload 199 // event processing needs to be done. 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 are 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 // The _hotness_counter indicates the hotness of a method. The higher 210 // the value the hotter the method. The hotness counter of a nmethod is 211 // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method 212 // is active while stack scanning (mark_active_nmethods()). The hotness 213 // counter is decreased (by 1) while sweeping. 214 int _hotness_counter; 215 216 ExceptionCache *_exception_cache; 217 PcDescCache _pc_desc_cache; 218 219 // These are used for compiled synchronized native methods to 220 // locate the owner and stack slot for the BasicLock so that we can 221 // properly revoke the bias of the owner if necessary. They are 222 // needed because there is no debug information for compiled native 223 // wrappers and the oop maps are insufficient to allow 224 // frame::retrieve_receiver() to work. Currently they are expected 225 // to be byte offsets from the Java stack pointer for maximum code 226 // sharing between platforms. Note that currently biased locking 227 // will never cause Class instances to be biased but this code 228 // handles the static synchronized case as well. 229 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver 230 // for non-static native wrapper frames. 231 ByteSize _native_receiver_sp_offset; 232 ByteSize _native_basic_lock_sp_offset; 233 234 friend class nmethodLocker; 235 236 // For native wrappers 237 nmethod(Method* method, 238 int nmethod_size, 239 int compile_id, 240 CodeOffsets* offsets, 241 CodeBuffer *code_buffer, 242 int frame_size, 243 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ 244 ByteSize basic_lock_sp_offset, /* synchronized natives only */ 245 OopMapSet* oop_maps); 246 247 #ifdef HAVE_DTRACE_H 248 // For native wrappers 249 nmethod(Method* method, 250 int nmethod_size, 251 CodeOffsets* offsets, 252 CodeBuffer *code_buffer, 253 int frame_size); 254 #endif // def HAVE_DTRACE_H 255 256 // Creation support 257 nmethod(Method* method, 258 int nmethod_size, 259 int compile_id, 260 int entry_bci, 261 CodeOffsets* offsets, 262 int orig_pc_offset, 263 DebugInformationRecorder *recorder, 264 Dependencies* dependencies, 265 CodeBuffer *code_buffer, 266 int frame_size, 267 OopMapSet* oop_maps, 268 ExceptionHandlerTable* handler_table, 269 ImplicitExceptionTable* nul_chk_table, 270 AbstractCompiler* compiler, 271 int comp_level); 272 273 // helper methods 274 void* operator new(size_t size, int nmethod_size) throw(); 275 276 const char* reloc_string_for(u_char* begin, u_char* end); 277 // Returns true if this thread changed the state of the nmethod or 278 // false if another thread performed the transition. 279 bool make_not_entrant_or_zombie(unsigned int state); 280 void inc_decompile_count(); 281 282 // Used to manipulate the exception cache 283 void add_exception_cache_entry(ExceptionCache* new_entry); 284 ExceptionCache* exception_cache_entry_for_exception(Handle exception); 285 286 // Inform external interfaces that a compiled method has been unloaded 287 void post_compiled_method_unload(); 288 289 // Initailize fields to their default values 290 void init_defaults(); 291 292 public: 293 // create nmethod with entry_bci 294 static nmethod* new_nmethod(methodHandle method, 295 int compile_id, 296 int entry_bci, 297 CodeOffsets* offsets, 298 int orig_pc_offset, 299 DebugInformationRecorder* recorder, 300 Dependencies* dependencies, 301 CodeBuffer *code_buffer, 302 int frame_size, 303 OopMapSet* oop_maps, 304 ExceptionHandlerTable* handler_table, 305 ImplicitExceptionTable* nul_chk_table, 306 AbstractCompiler* compiler, 307 int comp_level); 308 309 static nmethod* new_native_nmethod(methodHandle method, 310 int compile_id, 311 CodeBuffer *code_buffer, 312 int vep_offset, 313 int frame_complete, 314 int frame_size, 315 ByteSize receiver_sp_offset, 316 ByteSize basic_lock_sp_offset, 317 OopMapSet* oop_maps); 318 319 #ifdef HAVE_DTRACE_H 320 // The method we generate for a dtrace probe has to look 321 // like an nmethod as far as the rest of the system is concerned 322 // which is somewhat unfortunate. 323 static nmethod* new_dtrace_nmethod(methodHandle method, 324 CodeBuffer *code_buffer, 325 int vep_offset, 326 int trap_offset, 327 int frame_complete, 328 int frame_size); 329 330 int trap_offset() const { return _trap_offset; } 331 address trap_address() const { return insts_begin() + _trap_offset; } 332 333 #endif // def HAVE_DTRACE_H 334 335 // accessors 336 Method* method() const { return _method; } 337 AbstractCompiler* compiler() const { return _compiler; } 338 339 // type info 340 bool is_nmethod() const { return true; } 341 bool is_java_method() const { return !method()->is_native(); } 342 bool is_native_method() const { return method()->is_native(); } 343 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } 344 345 bool is_compiled_by_c1() const; 346 bool is_compiled_by_c2() const; 347 bool is_compiled_by_shark() const; 348 349 // boundaries for different parts 350 address consts_begin () const { return header_begin() + _consts_offset ; } 351 address consts_end () const { return header_begin() + code_offset() ; } 352 address insts_begin () const { return header_begin() + code_offset() ; } 353 address insts_end () const { return header_begin() + _stub_offset ; } 354 address stub_begin () const { return header_begin() + _stub_offset ; } 355 address stub_end () const { return header_begin() + _oops_offset ; } 356 address exception_begin () const { return header_begin() + _exception_offset ; } 357 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } 358 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } 359 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } 360 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } 361 oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; } 362 363 Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; } 364 Metadata** metadata_end () const { return (Metadata**) (header_begin() + _scopes_data_offset) ; } 365 366 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } 367 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } 368 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } 369 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } 370 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } 371 address dependencies_end () const { return header_begin() + _handler_table_offset ; } 372 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } 373 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } 374 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } 375 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } 376 377 // Sizes 378 int consts_size () const { return consts_end () - consts_begin (); } 379 int insts_size () const { return insts_end () - insts_begin (); } 380 int stub_size () const { return stub_end () - stub_begin (); } 381 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } 382 int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); } 383 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } 384 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } 385 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } 386 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } 387 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } 388 389 int total_size () const; 390 391 void dec_hotness_counter() { _hotness_counter--; } 392 void set_hotness_counter(int val) { _hotness_counter = val; } 393 int hotness_counter() const { return _hotness_counter; } 394 395 // Containment 396 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } 397 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); } 398 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } 399 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 400 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); } 401 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } 402 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } 403 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } 404 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } 405 406 // entry points 407 address entry_point() const { return _entry_point; } // normal entry point 408 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct 409 410 // flag accessing and manipulation 411 bool is_in_use() const { return _state == in_use; } 412 bool is_alive() const { return _state == in_use || _state == not_entrant; } 413 bool is_not_entrant() const { return _state == not_entrant; } 414 bool is_zombie() const { return _state == zombie; } 415 bool is_unloaded() const { return _state == unloaded; } 416 417 // Make the nmethod non entrant. The nmethod will continue to be 418 // alive. It is used when an uncommon trap happens. Returns true 419 // if this thread changed the state of the nmethod or false if 420 // another thread performed the transition. 421 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); } 422 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 423 424 // used by jvmti to track if the unload event has been reported 425 bool unload_reported() { return _unload_reported; } 426 void set_unload_reported() { _unload_reported = true; } 427 428 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; } 429 void mark_for_deoptimization() { _marked_for_deoptimization = true; } 430 431 void make_unloaded(BoolObjectClosure* is_alive, oop cause); 432 433 bool has_dependencies() { return dependencies_size() != 0; } 434 void flush_dependencies(BoolObjectClosure* is_alive); 435 bool has_flushed_dependencies() { return _has_flushed_dependencies; } 436 void set_has_flushed_dependencies() { 437 assert(!has_flushed_dependencies(), "should only happen once"); 438 _has_flushed_dependencies = 1; 439 } 440 441 bool is_marked_for_reclamation() const { return _marked_for_reclamation; } 442 void mark_for_reclamation() { _marked_for_reclamation = 1; } 443 444 bool has_unsafe_access() const { return _has_unsafe_access; } 445 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; } 446 447 bool has_method_handle_invokes() const { return _has_method_handle_invokes; } 448 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; } 449 450 bool is_lazy_critical_native() const { return _lazy_critical_native; } 451 void set_lazy_critical_native(bool z) { _lazy_critical_native = z; } 452 453 bool has_wide_vectors() const { return _has_wide_vectors; } 454 void set_has_wide_vectors(bool z) { _has_wide_vectors = z; } 455 456 int comp_level() const { return _comp_level; } 457 458 // Support for oops in scopes and relocs: 459 // Note: index 0 is reserved for null. 460 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } 461 oop* oop_addr_at(int index) const { // for GC 462 // relocation indexes are biased by 1 (because 0 is reserved) 463 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); 464 assert(!_oops_are_stale, "oops are stale"); 465 return &oops_begin()[index - 1]; 466 } 467 468 // Support for meta data in scopes and relocs: 469 // Note: index 0 is reserved for null. 470 Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); } 471 Metadata** metadata_addr_at(int index) const { // for GC 472 // relocation indexes are biased by 1 (because 0 is reserved) 473 assert(index > 0 && index <= metadata_size(), "must be a valid non-zero index"); 474 return &metadata_begin()[index - 1]; 475 } 476 477 void copy_values(GrowableArray<jobject>* oops); 478 void copy_values(GrowableArray<Metadata*>* metadata); 479 480 // Relocation support 481 private: 482 void fix_oop_relocations(address begin, address end, bool initialize_immediates); 483 inline void initialize_immediate_oop(oop* dest, jobject handle); 484 485 public: 486 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } 487 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } 488 void verify_oop_relocations(); 489 490 bool is_at_poll_return(address pc); 491 bool is_at_poll_or_poll_return(address pc); 492 493 // Scavengable oop support 494 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } 495 protected: 496 enum { sl_on_list = 0x01, sl_marked = 0x10 }; 497 void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; } 498 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } 499 // assertion-checking and pruning logic uses the bits of _scavenge_root_state 500 #ifndef PRODUCT 501 void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; } 502 void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; } 503 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; } 504 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. 505 #endif //PRODUCT 506 nmethod* scavenge_root_link() const { return _scavenge_root_link; } 507 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } 508 509 public: 510 511 // Sweeper support 512 long stack_traversal_mark() { return _stack_traversal_mark; } 513 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 514 515 // Exception cache support 516 ExceptionCache* exception_cache() const { return _exception_cache; } 517 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } 518 address handler_for_exception_and_pc(Handle exception, address pc); 519 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); 520 void remove_from_exception_cache(ExceptionCache* ec); 521 522 // implicit exceptions support 523 address continuation_for_implicit_exception(address pc); 524 525 // On-stack replacement support 526 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; } 527 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; } 528 void invalidate_osr_method(); 529 nmethod* osr_link() const { return _osr_link; } 530 void set_osr_link(nmethod *n) { _osr_link = n; } 531 532 // tells whether frames described by this nmethod can be deoptimized 533 // note: native wrappers cannot be deoptimized. 534 bool can_be_deoptimized() const { return is_java_method(); } 535 536 // Inline cache support 537 void clear_inline_caches(); 538 void cleanup_inline_caches(); 539 bool inlinecache_check_contains(address addr) const { 540 return (addr >= code_begin() && addr < verified_entry_point()); 541 } 542 543 // Check that all metadata is still alive 544 void verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive); 545 546 // unlink and deallocate this nmethod 547 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not 548 // expected to use any other private methods/data in this class. 549 550 protected: 551 void flush(); 552 553 public: 554 // When true is returned, it is unsafe to remove this nmethod even if 555 // it is a zombie, since the VM or the ServiceThread might still be 556 // using it. 557 bool is_locked_by_vm() const { return _lock_count >0; } 558 559 // See comment at definition of _last_seen_on_stack 560 void mark_as_seen_on_stack(); 561 bool can_not_entrant_be_converted(); 562 563 // Evolution support. We make old (discarded) compiled methods point to new Method*s. 564 void set_method(Method* method) { _method = method; } 565 566 // GC support 567 void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred); 568 bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred); 569 570 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, 571 OopClosure* f); 572 void oops_do(OopClosure* f) { oops_do(f, false); } 573 void oops_do(OopClosure* f, bool allow_zombie); 574 bool detect_scavenge_root_oops(); 575 void verify_scavenge_root_oops() PRODUCT_RETURN; 576 577 bool test_set_oops_do_mark(); 578 static void oops_do_marking_prologue(); 579 static void oops_do_marking_epilogue(); 580 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } 581 bool test_oops_do_mark() { return _oops_do_mark_link != NULL; } 582 583 // ScopeDesc for an instruction 584 ScopeDesc* scope_desc_at(address pc); 585 586 private: 587 ScopeDesc* scope_desc_in(address begin, address end); 588 589 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } 590 591 PcDesc* find_pc_desc_internal(address pc, bool approximate); 592 593 PcDesc* find_pc_desc(address pc, bool approximate) { 594 PcDesc* desc = _pc_desc_cache.last_pc_desc(); 595 if (desc != NULL && desc->pc_offset() == pc - code_begin()) { 596 return desc; 597 } 598 return find_pc_desc_internal(pc, approximate); 599 } 600 601 public: 602 // ScopeDesc retrieval operation 603 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } 604 // pc_desc_near returns the first PcDesc at or after the givne pc. 605 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } 606 607 public: 608 // copying of debugging information 609 void copy_scopes_pcs(PcDesc* pcs, int count); 610 void copy_scopes_data(address buffer, int size); 611 612 // Deopt 613 // Return true is the PC is one would expect if the frame is being deopted. 614 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); } 615 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); } 616 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); } 617 // Accessor/mutator for the original pc of a frame before a frame was deopted. 618 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } 619 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } 620 621 static address get_deopt_original_pc(const frame* fr); 622 623 // MethodHandle 624 bool is_method_handle_return(address return_pc); 625 626 // jvmti support: 627 void post_compiled_method_load_event(); 628 jmethodID get_and_cache_jmethod_id(); 629 630 // verify operations 631 void verify(); 632 void verify_scopes(); 633 void verify_interrupt_point(address interrupt_point); 634 635 // printing support 636 void print() const; 637 void print_code(); 638 void print_relocations() PRODUCT_RETURN; 639 void print_pcs() PRODUCT_RETURN; 640 void print_scopes() PRODUCT_RETURN; 641 void print_dependencies() PRODUCT_RETURN; 642 void print_value_on(outputStream* st) const PRODUCT_RETURN; 643 void print_calls(outputStream* st) PRODUCT_RETURN; 644 void print_handler_table() PRODUCT_RETURN; 645 void print_nul_chk_table() PRODUCT_RETURN; 646 void print_nmethod(bool print_code); 647 648 // need to re-define this from CodeBlob else the overload hides it 649 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } 650 void print_on(outputStream* st, const char* msg) const; 651 652 // Logging 653 void log_identity(xmlStream* log) const; 654 void log_new_nmethod() const; 655 void log_state_change() const; 656 657 // Prints block-level comments, including nmethod specific block labels: 658 virtual void print_block_comment(outputStream* stream, address block_begin) const { 659 print_nmethod_labels(stream, block_begin); 660 CodeBlob::print_block_comment(stream, block_begin); 661 } 662 void print_nmethod_labels(outputStream* stream, address block_begin) const; 663 664 // Prints a comment for one native instruction (reloc info, pc desc) 665 void print_code_comment_on(outputStream* st, int column, address begin, address end); 666 static void print_statistics() PRODUCT_RETURN; 667 668 // Compiler task identification. Note that all OSR methods 669 // are numbered in an independent sequence if CICountOSR is true, 670 // and native method wrappers are also numbered independently if 671 // CICountNative is true. 672 int compile_id() const { return _compile_id; } 673 const char* compile_kind() const; 674 675 // For debugging 676 // CompiledIC* IC_at(char* p) const; 677 // PrimitiveIC* primitiveIC_at(char* p) const; 678 oop embeddedOop_at(address p); 679 680 // tells if any of this method's dependencies have been invalidated 681 // (this is expensive!) 682 static void check_all_dependencies(DepChange& changes); 683 684 // tells if this compiled method is dependent on the given changes, 685 // and the changes have invalidated it 686 bool check_dependency_on(DepChange& changes); 687 688 // Evolution support. Tells if this compiled method is dependent on any of 689 // methods m() of class dependee, such that if m() in dependee is replaced, 690 // this compiled method will have to be deoptimized. 691 bool is_evol_dependent_on(Klass* dependee); 692 693 // Fast breakpoint support. Tells if this compiled method is 694 // dependent on the given method. Returns true if this nmethod 695 // corresponds to the given method as well. 696 bool is_dependent_on_method(Method* dependee); 697 698 // is it ok to patch at address? 699 bool is_patchable_at(address instr_address); 700 701 // UseBiasedLocking support 702 ByteSize native_receiver_sp_offset() { 703 return _native_receiver_sp_offset; 704 } 705 ByteSize native_basic_lock_sp_offset() { 706 return _native_basic_lock_sp_offset; 707 } 708 709 // support for code generation 710 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } 711 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } 712 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } 713 714 // RedefineClasses support. Mark metadata in nmethods as on_stack so that 715 // redefine classes doesn't purge it. 716 static void mark_on_stack(nmethod* nm) { 717 nm->metadata_do(Metadata::mark_on_stack); 718 } 719 void metadata_do(void f(Metadata*)); 720 }; 721 722 // Locks an nmethod so its code will not get removed and it will not 723 // be made into a zombie, even if it is a not_entrant method. After the 724 // nmethod becomes a zombie, if CompiledMethodUnload event processing 725 // needs to be done, then lock_nmethod() is used directly to keep the 726 // generated code from being reused too early. 727 class nmethodLocker : public StackObj { 728 nmethod* _nm; 729 730 public: 731 732 // note: nm can be NULL 733 // Only JvmtiDeferredEvent::compiled_method_unload_event() 734 // should pass zombie_ok == true. 735 static void lock_nmethod(nmethod* nm, bool zombie_ok = false); 736 static void unlock_nmethod(nmethod* nm); // (ditto) 737 738 nmethodLocker(address pc); // derive nm from pc 739 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } 740 nmethodLocker() { _nm = NULL; } 741 ~nmethodLocker() { unlock_nmethod(_nm); } 742 743 nmethod* code() { return _nm; } 744 void set_code(nmethod* new_nm) { 745 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. 746 _nm = new_nm; 747 lock_nmethod(_nm); 748 } 749 }; 750 751 #endif // SHARE_VM_CODE_NMETHOD_HPP