1 /*
2 * Copyright (c) 1997, 2021, 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 *
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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 *
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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23 */
24
25 #ifndef SHARE_CODE_NMETHOD_HPP
26 #define SHARE_CODE_NMETHOD_HPP
27
28 #include "code/compiledMethod.hpp"
29 #include "compiler/compilerDefinitions.hpp"
30
31 class DepChange;
32 class DirectiveSet;
33 class DebugInformationRecorder;
34 class JvmtiThreadState;
35
36 // nmethods (native methods) are the compiled code versions of Java methods.
37 //
38 // An nmethod contains:
39 // - header (the nmethod structure)
40 // [Relocation]
41 // - relocation information
42 // - constant part (doubles, longs and floats used in nmethod)
43 // - oop table
44 // [Code]
45 // - code body
46 // - exception handler
47 // - stub code
48 // [Debugging information]
49 // - oop array
50 // - data array
51 // - pcs
52 // [Exception handler table]
53 // - handler entry point array
54 // [Implicit Null Pointer exception table]
55 // - implicit null table array
56 // [Speculations]
57 // - encoded speculations array
58 // [JVMCINMethodData]
59 // - meta data for JVMCI compiled nmethod
60
61 #if INCLUDE_JVMCI
62 class FailedSpeculation;
63 class JVMCINMethodData;
64 #endif
65
66 class nmethod : public CompiledMethod {
67 friend class VMStructs;
68 friend class JVMCIVMStructs;
69 friend class NMethodSweeper;
70 friend class CodeCache; // scavengable oops
71 friend class JVMCINMethodData;
72
73 private:
74 // Shared fields for all nmethod's
75 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
76
77 // To support simple linked-list chaining of nmethods:
78 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head
79
80 // STW two-phase nmethod root processing helpers.
81 //
82 // When determining liveness of a given nmethod to do code cache unloading,
83 // some collectors need to do different things depending on whether the nmethods
84 // need to absolutely be kept alive during root processing; "strong"ly reachable
85 // nmethods are known to be kept alive at root processing, but the liveness of
86 // "weak"ly reachable ones is to be determined later.
87 //
88 // We want to allow strong and weak processing of nmethods by different threads
89 // at the same time without heavy synchronization. Additional constraints are
90 // to make sure that every nmethod is processed a minimal amount of time, and
91 // nmethods themselves are always iterated at most once at a particular time.
92 //
93 // Note that strong processing work must be a superset of weak processing work
94 // for this code to work.
95 //
96 // We store state and claim information in the _oops_do_mark_link member, using
97 // the two LSBs for the state and the remaining upper bits for linking together
98 // nmethods that were already visited.
99 // The last element is self-looped, i.e. points to itself to avoid some special
100 // "end-of-list" sentinel value.
101 //
102 // _oops_do_mark_link special values:
103 //
104 // _oops_do_mark_link == NULL: the nmethod has not been visited at all yet, i.e.
105 // is Unclaimed.
106 //
107 // For other values, its lowest two bits indicate the following states of the nmethod:
108 //
109 // weak_request (WR): the nmethod has been claimed by a thread for weak processing
110 // weak_done (WD): weak processing has been completed for this nmethod.
111 // strong_request (SR): the nmethod has been found to need strong processing while
112 // being weak processed.
113 // strong_done (SD): strong processing has been completed for this nmethod .
114 //
115 // The following shows the _only_ possible progressions of the _oops_do_mark_link
116 // pointer.
117 //
118 // Given
119 // N as the nmethod
120 // X the current next value of _oops_do_mark_link
121 //
122 // Unclaimed (C)-> N|WR (C)-> X|WD: the nmethod has been processed weakly by
123 // a single thread.
124 // Unclaimed (C)-> N|WR (C)-> X|WD (O)-> X|SD: after weak processing has been
125 // completed (as above) another thread found that the nmethod needs strong
126 // processing after all.
127 // Unclaimed (C)-> N|WR (O)-> N|SR (C)-> X|SD: during weak processing another
128 // thread finds that the nmethod needs strong processing, marks it as such and
129 // terminates. The original thread completes strong processing.
130 // Unclaimed (C)-> N|SD (C)-> X|SD: the nmethod has been processed strongly from
131 // the beginning by a single thread.
132 //
133 // "|" describes the concatentation of bits in _oops_do_mark_link.
134 //
135 // The diagram also describes the threads responsible for changing the nmethod to
136 // the next state by marking the _transition_ with (C) and (O), which mean "current"
137 // and "other" thread respectively.
138 //
139 struct oops_do_mark_link; // Opaque data type.
140
141 // States used for claiming nmethods during root processing.
142 static const uint claim_weak_request_tag = 0;
143 static const uint claim_weak_done_tag = 1;
144 static const uint claim_strong_request_tag = 2;
145 static const uint claim_strong_done_tag = 3;
146
147 static oops_do_mark_link* mark_link(nmethod* nm, uint tag) {
148 assert(tag <= claim_strong_done_tag, "invalid tag %u", tag);
149 assert(is_aligned(nm, 4), "nmethod pointer must have zero lower two LSB");
150 return (oops_do_mark_link*)(((uintptr_t)nm & ~0x3) | tag);
151 }
152
153 static uint extract_state(oops_do_mark_link* link) {
154 return (uint)((uintptr_t)link & 0x3);
155 }
156
157 static nmethod* extract_nmethod(oops_do_mark_link* link) {
158 return (nmethod*)((uintptr_t)link & ~0x3);
159 }
160
161 void oops_do_log_change(const char* state);
162
163 static bool oops_do_has_weak_request(oops_do_mark_link* next) {
164 return extract_state(next) == claim_weak_request_tag;
165 }
166
167 static bool oops_do_has_any_strong_state(oops_do_mark_link* next) {
168 return extract_state(next) >= claim_strong_request_tag;
169 }
170
171 // Attempt Unclaimed -> N|WR transition. Returns true if successful.
172 bool oops_do_try_claim_weak_request();
173
174 // Attempt Unclaimed -> N|SD transition. Returns the current link.
175 oops_do_mark_link* oops_do_try_claim_strong_done();
176 // Attempt N|WR -> X|WD transition. Returns NULL if successful, X otherwise.
177 nmethod* oops_do_try_add_to_list_as_weak_done();
178
179 // Attempt X|WD -> N|SR transition. Returns the current link.
180 oops_do_mark_link* oops_do_try_add_strong_request(oops_do_mark_link* next);
181 // Attempt X|WD -> X|SD transition. Returns true if successful.
182 bool oops_do_try_claim_weak_done_as_strong_done(oops_do_mark_link* next);
183
184 // Do the N|SD -> X|SD transition.
185 void oops_do_add_to_list_as_strong_done();
186
187 // Sets this nmethod as strongly claimed (as part of N|SD -> X|SD and N|SR -> X|SD
188 // transitions).
189 void oops_do_set_strong_done(nmethod* old_head);
190
191 static nmethod* volatile _oops_do_mark_nmethods;
192 oops_do_mark_link* volatile _oops_do_mark_link;
193
194 // offsets for entry points
195 address _entry_point; // entry point with class check
196 address _verified_entry_point; // entry point without class check
197 address _inline_entry_point; // inline type entry point (unpack all inline type args) with class check
198 address _verified_inline_entry_point; // inline type entry point (unpack all inline type args) without class check
199 address _verified_inline_ro_entry_point; // inline type entry point (unpack receiver only) without class check
200 address _osr_entry_point; // entry point for on stack replacement
201
202 // Offsets for different nmethod parts
203 int _exception_offset;
204 // Offset of the unwind handler if it exists
205 int _unwind_handler_offset;
206
207 int _consts_offset;
208 int _stub_offset;
209 int _oops_offset; // offset to where embedded oop table begins (inside data)
210 int _metadata_offset; // embedded meta data table
211 int _scopes_data_offset;
212 int _scopes_pcs_offset;
213 int _dependencies_offset;
214 int _native_invokers_offset;
215 int _handler_table_offset;
216 int _nul_chk_table_offset;
217 #if INCLUDE_JVMCI
218 int _speculations_offset;
219 int _jvmci_data_offset;
220 #endif
221 int _nmethod_end_offset;
222
223 int code_offset() const { return (address) code_begin() - header_begin(); }
224
225 // location in frame (offset for sp) that deopt can store the original
226 // pc during a deopt.
227 int _orig_pc_offset;
228
229 int _compile_id; // which compilation made this nmethod
230 int _comp_level; // compilation level
231
232 // protected by CodeCache_lock
233 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
234
235 // used by jvmti to track if an event has been posted for this nmethod.
236 bool _unload_reported;
237 bool _load_reported;
238
239 // Protected by CompiledMethod_lock
240 volatile signed char _state; // {not_installed, in_use, not_entrant, zombie, unloaded}
241
242 #ifdef ASSERT
243 bool _oops_are_stale; // indicates that it's no longer safe to access oops section
244 #endif
245
246 #if INCLUDE_RTM_OPT
247 // RTM state at compile time. Used during deoptimization to decide
248 // whether to restart collecting RTM locking abort statistic again.
249 RTMState _rtm_state;
250 #endif
251
252 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed
253 // and is not made into a zombie. However, once the nmethod is made into
254 // a zombie, it will be locked one final time if CompiledMethodUnload
255 // event processing needs to be done.
256 volatile jint _lock_count;
257
258 // not_entrant method removal. Each mark_sweep pass will update
259 // this mark to current sweep invocation count if it is seen on the
260 // stack. An not_entrant method can be removed when there are no
261 // more activations, i.e., when the _stack_traversal_mark is less than
262 // current sweep traversal index.
263 volatile int64_t _stack_traversal_mark;
264
265 // The _hotness_counter indicates the hotness of a method. The higher
266 // the value the hotter the method. The hotness counter of a nmethod is
267 // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method
268 // is active while stack scanning (do_stack_scanning()). The hotness
269 // counter is decreased (by 1) while sweeping.
270 int _hotness_counter;
271
272 // Local state used to keep track of whether unloading is happening or not
273 volatile uint8_t _is_unloading_state;
274
275 // These are used for compiled synchronized native methods to
276 // locate the owner and stack slot for the BasicLock. They are
277 // needed because there is no debug information for compiled native
278 // wrappers and the oop maps are insufficient to allow
279 // frame::retrieve_receiver() to work. Currently they are expected
280 // to be byte offsets from the Java stack pointer for maximum code
281 // sharing between platforms. JVMTI's GetLocalInstance() uses these
282 // offsets to find the receiver for non-static native wrapper frames.
283 ByteSize _native_receiver_sp_offset;
284 ByteSize _native_basic_lock_sp_offset;
285
286 friend class nmethodLocker;
287
288 // For native wrappers
289 nmethod(Method* method,
290 CompilerType type,
291 int nmethod_size,
292 int compile_id,
293 CodeOffsets* offsets,
294 CodeBuffer *code_buffer,
295 int frame_size,
296 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
297 ByteSize basic_lock_sp_offset, /* synchronized natives only */
298 OopMapSet* oop_maps);
299
300 // Creation support
301 nmethod(Method* method,
302 CompilerType type,
303 int nmethod_size,
304 int compile_id,
305 int entry_bci,
306 CodeOffsets* offsets,
307 int orig_pc_offset,
308 DebugInformationRecorder *recorder,
309 Dependencies* dependencies,
310 CodeBuffer *code_buffer,
311 int frame_size,
312 OopMapSet* oop_maps,
313 ExceptionHandlerTable* handler_table,
314 ImplicitExceptionTable* nul_chk_table,
315 AbstractCompiler* compiler,
316 int comp_level,
317 const GrowableArrayView<RuntimeStub*>& native_invokers
318 #if INCLUDE_JVMCI
319 , char* speculations,
320 int speculations_len,
321 int jvmci_data_size
322 #endif
323 );
324
325 // helper methods
326 void* operator new(size_t size, int nmethod_size, int comp_level) throw();
327
328 const char* reloc_string_for(u_char* begin, u_char* end);
329
330 bool try_transition(int new_state);
331
332 // Returns true if this thread changed the state of the nmethod or
333 // false if another thread performed the transition.
334 bool make_not_entrant_or_zombie(int state);
335 bool make_entrant() { Unimplemented(); return false; }
336 void inc_decompile_count();
337
338 // Inform external interfaces that a compiled method has been unloaded
339 void post_compiled_method_unload();
340
341 // Initailize fields to their default values
342 void init_defaults();
343
344 // Offsets
345 int content_offset() const { return content_begin() - header_begin(); }
346 int data_offset() const { return _data_offset; }
347
348 address header_end() const { return (address) header_begin() + header_size(); }
349
350 public:
351 // create nmethod with entry_bci
352 static nmethod* new_nmethod(const methodHandle& method,
353 int compile_id,
354 int entry_bci,
355 CodeOffsets* offsets,
356 int orig_pc_offset,
357 DebugInformationRecorder* recorder,
358 Dependencies* dependencies,
359 CodeBuffer *code_buffer,
360 int frame_size,
361 OopMapSet* oop_maps,
362 ExceptionHandlerTable* handler_table,
363 ImplicitExceptionTable* nul_chk_table,
364 AbstractCompiler* compiler,
365 int comp_level,
366 const GrowableArrayView<RuntimeStub*>& native_invokers = GrowableArrayView<RuntimeStub*>::EMPTY
367 #if INCLUDE_JVMCI
368 , char* speculations = NULL,
369 int speculations_len = 0,
370 int nmethod_mirror_index = -1,
371 const char* nmethod_mirror_name = NULL,
372 FailedSpeculation** failed_speculations = NULL
373 #endif
374 );
375
376 // Only used for unit tests.
377 nmethod()
378 : CompiledMethod(),
379 _is_unloading_state(0),
380 _native_receiver_sp_offset(in_ByteSize(-1)),
381 _native_basic_lock_sp_offset(in_ByteSize(-1)) {}
382
383
384 static nmethod* new_native_nmethod(const methodHandle& method,
385 int compile_id,
386 CodeBuffer *code_buffer,
387 int vep_offset,
388 int frame_complete,
389 int frame_size,
390 ByteSize receiver_sp_offset,
391 ByteSize basic_lock_sp_offset,
392 OopMapSet* oop_maps);
393
394 // type info
395 bool is_nmethod() const { return true; }
396 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
397
398 // boundaries for different parts
399 address consts_begin () const { return header_begin() + _consts_offset ; }
400 address consts_end () const { return code_begin() ; }
401 address stub_begin () const { return header_begin() + _stub_offset ; }
402 address stub_end () const { return header_begin() + _oops_offset ; }
403 address exception_begin () const { return header_begin() + _exception_offset ; }
404 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
405 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
406 oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; }
407
408 Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; }
409 Metadata** metadata_end () const { return (Metadata**) _scopes_data_begin; }
410
411 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
412 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
413 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
414 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
415 address dependencies_end () const { return header_begin() + _native_invokers_offset ; }
416 RuntimeStub** native_invokers_begin() const { return (RuntimeStub**)(header_begin() + _native_invokers_offset) ; }
417 RuntimeStub** native_invokers_end () const { return (RuntimeStub**)(header_begin() + _handler_table_offset); }
418 address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
419 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
420 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
421 #if INCLUDE_JVMCI
422 address nul_chk_table_end () const { return header_begin() + _speculations_offset ; }
423 address speculations_begin () const { return header_begin() + _speculations_offset ; }
424 address speculations_end () const { return header_begin() + _jvmci_data_offset ; }
425 address jvmci_data_begin () const { return header_begin() + _jvmci_data_offset ; }
426 address jvmci_data_end () const { return header_begin() + _nmethod_end_offset ; }
427 #else
428 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
429 #endif
430
431 // Sizes
432 int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
433 int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); }
434 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
435 #if INCLUDE_JVMCI
436 int speculations_size () const { return speculations_end () - speculations_begin (); }
437 int jvmci_data_size () const { return jvmci_data_end () - jvmci_data_begin (); }
438 #endif
439
440 int oops_count() const { assert(oops_size() % oopSize == 0, ""); return (oops_size() / oopSize) + 1; }
441 int metadata_count() const { assert(metadata_size() % wordSize == 0, ""); return (metadata_size() / wordSize) + 1; }
442
443 int total_size () const;
444
445 void dec_hotness_counter() { _hotness_counter--; }
446 void set_hotness_counter(int val) { _hotness_counter = val; }
447 int hotness_counter() const { return _hotness_counter; }
448
449 // Containment
450 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
451 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); }
452 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
453 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
454
455 // entry points
456 address entry_point() const { return _entry_point; } // normal entry point
457 address verified_entry_point() const { return _verified_entry_point; } // normal entry point without class check
458 address inline_entry_point() const { return _inline_entry_point; } // inline type entry point (unpack all inline type args)
459 address verified_inline_entry_point() const { return _verified_inline_entry_point; } // inline type entry point (unpack all inline type args) without class check
460 address verified_inline_ro_entry_point() const { return _verified_inline_ro_entry_point; } // inline type entry point (only unpack receiver) without class check
461
462 // flag accessing and manipulation
463 bool is_not_installed() const { return _state == not_installed; }
464 bool is_in_use() const { return _state <= in_use; }
465 bool is_alive() const { return _state < unloaded; }
466 bool is_not_entrant() const { return _state == not_entrant; }
467 bool is_zombie() const { return _state == zombie; }
468 bool is_unloaded() const { return _state == unloaded; }
469
470 void clear_unloading_state();
471 virtual bool is_unloading();
472 virtual void do_unloading(bool unloading_occurred);
473
474 #if INCLUDE_RTM_OPT
475 // rtm state accessing and manipulating
476 RTMState rtm_state() const { return _rtm_state; }
477 void set_rtm_state(RTMState state) { _rtm_state = state; }
478 #endif
479
480 bool make_in_use() {
481 return try_transition(in_use);
482 }
483 // Make the nmethod non entrant. The nmethod will continue to be
484 // alive. It is used when an uncommon trap happens. Returns true
485 // if this thread changed the state of the nmethod or false if
486 // another thread performed the transition.
487 bool make_not_entrant() {
488 assert(!method()->is_method_handle_intrinsic(), "Cannot make MH intrinsic not entrant");
489 return make_not_entrant_or_zombie(not_entrant);
490 }
491 bool make_not_used() { return make_not_entrant(); }
492 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
493
494 int get_state() const {
495 return _state;
496 }
497
498 void make_unloaded();
499
500 bool has_dependencies() { return dependencies_size() != 0; }
501 void print_dependencies() PRODUCT_RETURN;
502 void flush_dependencies(bool delete_immediately);
503 bool has_flushed_dependencies() { return _has_flushed_dependencies; }
504 void set_has_flushed_dependencies() {
505 assert(!has_flushed_dependencies(), "should only happen once");
506 _has_flushed_dependencies = 1;
507 }
508
509 int comp_level() const { return _comp_level; }
510
511 void unlink_from_method();
512
513 // Support for oops in scopes and relocs:
514 // Note: index 0 is reserved for null.
515 oop oop_at(int index) const;
516 oop oop_at_phantom(int index) const; // phantom reference
517 oop* oop_addr_at(int index) const { // for GC
518 // relocation indexes are biased by 1 (because 0 is reserved)
519 assert(index > 0 && index <= oops_count(), "must be a valid non-zero index");
520 assert(!_oops_are_stale, "oops are stale");
521 return &oops_begin()[index - 1];
522 }
523
524 // Support for meta data in scopes and relocs:
525 // Note: index 0 is reserved for null.
526 Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); }
527 Metadata** metadata_addr_at(int index) const { // for GC
528 // relocation indexes are biased by 1 (because 0 is reserved)
529 assert(index > 0 && index <= metadata_count(), "must be a valid non-zero index");
530 return &metadata_begin()[index - 1];
531 }
532
533 void copy_values(GrowableArray<jobject>* oops);
534 void copy_values(GrowableArray<Metadata*>* metadata);
535
536 void free_native_invokers();
537
538 // Relocation support
539 private:
540 void fix_oop_relocations(address begin, address end, bool initialize_immediates);
541 inline void initialize_immediate_oop(oop* dest, jobject handle);
542
543 public:
544 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
545 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
546
547 // Sweeper support
548 int64_t stack_traversal_mark() { return _stack_traversal_mark; }
549 void set_stack_traversal_mark(int64_t l) { _stack_traversal_mark = l; }
550
551 // On-stack replacement support
552 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; }
553 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; }
554 void invalidate_osr_method();
555 nmethod* osr_link() const { return _osr_link; }
556 void set_osr_link(nmethod *n) { _osr_link = n; }
557
558 // Verify calls to dead methods have been cleaned.
559 void verify_clean_inline_caches();
560
561 // unlink and deallocate this nmethod
562 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
563 // expected to use any other private methods/data in this class.
564
565 protected:
566 void flush();
567
568 public:
569 // When true is returned, it is unsafe to remove this nmethod even if
570 // it is a zombie, since the VM or the ServiceThread might still be
571 // using it.
572 bool is_locked_by_vm() const { return _lock_count >0; }
573
574 // See comment at definition of _last_seen_on_stack
575 void mark_as_seen_on_stack();
576 bool can_convert_to_zombie();
577
578 // Evolution support. We make old (discarded) compiled methods point to new Method*s.
579 void set_method(Method* method) { _method = method; }
580
581 #if INCLUDE_JVMCI
582 // Gets the JVMCI name of this nmethod.
583 const char* jvmci_name();
584
585 // Records the pending failed speculation in the
586 // JVMCI speculation log associated with this nmethod.
587 void update_speculation(JavaThread* thread);
588
589 // Gets the data specific to a JVMCI compiled method.
590 // This returns a non-NULL value iff this nmethod was
591 // compiled by the JVMCI compiler.
592 JVMCINMethodData* jvmci_nmethod_data() const {
593 return jvmci_data_size() == 0 ? NULL : (JVMCINMethodData*) jvmci_data_begin();
594 }
595 #endif
596
597 public:
598 void oops_do(OopClosure* f) { oops_do(f, false); }
599 void oops_do(OopClosure* f, bool allow_dead);
600
601 // All-in-one claiming of nmethods: returns true if the caller successfully claimed that
602 // nmethod.
603 bool oops_do_try_claim();
604
605 // Class containing callbacks for the oops_do_process_weak/strong() methods
606 // below.
607 class OopsDoProcessor {
608 public:
609 // Process the oops of the given nmethod based on whether it has been called
610 // in a weak or strong processing context, i.e. apply either weak or strong
611 // work on it.
612 virtual void do_regular_processing(nmethod* nm) = 0;
613 // Assuming that the oops of the given nmethod has already been its weak
614 // processing applied, apply the remaining strong processing part.
615 virtual void do_remaining_strong_processing(nmethod* nm) = 0;
616 };
617
618 // The following two methods do the work corresponding to weak/strong nmethod
619 // processing.
620 void oops_do_process_weak(OopsDoProcessor* p);
621 void oops_do_process_strong(OopsDoProcessor* p);
622
623 static void oops_do_marking_prologue();
624 static void oops_do_marking_epilogue();
625
626 private:
627 ScopeDesc* scope_desc_in(address begin, address end);
628
629 address* orig_pc_addr(const frame* fr);
630
631 // used by jvmti to track if the load and unload events has been reported
632 bool unload_reported() const { return _unload_reported; }
633 void set_unload_reported() { _unload_reported = true; }
634 bool load_reported() const { return _load_reported; }
635 void set_load_reported() { _load_reported = true; }
636
637 public:
638 // copying of debugging information
639 void copy_scopes_pcs(PcDesc* pcs, int count);
640 void copy_scopes_data(address buffer, int size);
641
642 // Accessor/mutator for the original pc of a frame before a frame was deopted.
643 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
644 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
645
646 // jvmti support:
647 void post_compiled_method_load_event(JvmtiThreadState* state = NULL);
648
649 // verify operations
650 void verify();
651 void verify_scopes();
652 void verify_interrupt_point(address interrupt_point);
653
654 // Disassemble this nmethod with additional debug information, e.g. information about blocks.
655 void decode2(outputStream* st) const;
656 void print_constant_pool(outputStream* st);
657
658 // Avoid hiding of parent's 'decode(outputStream*)' method.
659 void decode(outputStream* st) const { decode2(st); } // just delegate here.
660
661 // printing support
662 void print() const;
663 void print(outputStream* st) const;
664 void print_code();
665
666 #if defined(SUPPORT_DATA_STRUCTS)
667 // print output in opt build for disassembler library
668 void print_relocations() PRODUCT_RETURN;
669 void print_pcs() { print_pcs_on(tty); }
670 void print_pcs_on(outputStream* st);
671 void print_scopes() { print_scopes_on(tty); }
672 void print_scopes_on(outputStream* st) PRODUCT_RETURN;
673 void print_value_on(outputStream* st) const;
674 void print_native_invokers();
675 void print_handler_table();
676 void print_nul_chk_table();
677 void print_recorded_oop(int log_n, int index);
678 void print_recorded_oops();
679 void print_recorded_metadata();
680
681 void print_oops(outputStream* st); // oops from the underlying CodeBlob.
682 void print_metadata(outputStream* st); // metadata in metadata pool.
683 #else
684 // void print_pcs() PRODUCT_RETURN;
685 void print_pcs() { return; }
686 #endif
687
688 void print_calls(outputStream* st) PRODUCT_RETURN;
689 static void print_statistics() PRODUCT_RETURN;
690
691 void maybe_print_nmethod(DirectiveSet* directive);
692 void print_nmethod(bool print_code);
693
694 // need to re-define this from CodeBlob else the overload hides it
695 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
696 void print_on(outputStream* st, const char* msg) const;
697
698 // Logging
699 void log_identity(xmlStream* log) const;
700 void log_new_nmethod() const;
701 void log_state_change() const;
702
703 // Prints block-level comments, including nmethod specific block labels:
704 virtual void print_block_comment(outputStream* stream, address block_begin) const {
705 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
706 print_nmethod_labels(stream, block_begin);
707 CodeBlob::print_block_comment(stream, block_begin);
708 #endif
709 }
710
711 void print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels=true) const;
712 const char* nmethod_section_label(address pos) const;
713
714 // returns whether this nmethod has code comments.
715 bool has_code_comment(address begin, address end);
716 // Prints a comment for one native instruction (reloc info, pc desc)
717 void print_code_comment_on(outputStream* st, int column, address begin, address end);
718
719 // Compiler task identification. Note that all OSR methods
720 // are numbered in an independent sequence if CICountOSR is true,
721 // and native method wrappers are also numbered independently if
722 // CICountNative is true.
723 virtual int compile_id() const { return _compile_id; }
724 const char* compile_kind() const;
725
726 // tells if any of this method's dependencies have been invalidated
727 // (this is expensive!)
728 static void check_all_dependencies(DepChange& changes);
729
730 // tells if this compiled method is dependent on the given changes,
731 // and the changes have invalidated it
732 bool check_dependency_on(DepChange& changes);
733
734 // Fast breakpoint support. Tells if this compiled method is
735 // dependent on the given method. Returns true if this nmethod
736 // corresponds to the given method as well.
737 virtual bool is_dependent_on_method(Method* dependee);
738
739 // is it ok to patch at address?
740 bool is_patchable_at(address instr_address);
741
742 // JVMTI's GetLocalInstance() support
743 ByteSize native_receiver_sp_offset() {
744 return _native_receiver_sp_offset;
745 }
746 ByteSize native_basic_lock_sp_offset() {
747 return _native_basic_lock_sp_offset;
748 }
749
750 // support for code generation
751 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
752 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
753 static int state_offset() { return offset_of(nmethod, _state); }
754
755 virtual void metadata_do(MetadataClosure* f);
756
757 NativeCallWrapper* call_wrapper_at(address call) const;
758 NativeCallWrapper* call_wrapper_before(address return_pc) const;
759 address call_instruction_address(address pc) const;
760
761 virtual CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) const;
762 virtual CompiledStaticCall* compiledStaticCall_at(address addr) const;
763 virtual CompiledStaticCall* compiledStaticCall_before(address addr) const;
764 };
765
766 // Locks an nmethod so its code will not get removed and it will not
767 // be made into a zombie, even if it is a not_entrant method. After the
768 // nmethod becomes a zombie, if CompiledMethodUnload event processing
769 // needs to be done, then lock_nmethod() is used directly to keep the
770 // generated code from being reused too early.
771 class nmethodLocker : public StackObj {
772 CompiledMethod* _nm;
773
774 public:
775
776 // note: nm can be NULL
777 // Only JvmtiDeferredEvent::compiled_method_unload_event()
778 // should pass zombie_ok == true.
779 static void lock_nmethod(CompiledMethod* nm, bool zombie_ok = false);
780 static void unlock_nmethod(CompiledMethod* nm); // (ditto)
781
782 nmethodLocker(address pc); // derive nm from pc
783 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
784 nmethodLocker(CompiledMethod *nm) {
785 _nm = nm;
786 lock(_nm);
787 }
788
789 static void lock(CompiledMethod* method, bool zombie_ok = false) {
790 if (method == NULL) return;
791 lock_nmethod(method, zombie_ok);
792 }
793
794 static void unlock(CompiledMethod* method) {
795 if (method == NULL) return;
796 unlock_nmethod(method);
797 }
798
799 nmethodLocker() { _nm = NULL; }
800 ~nmethodLocker() {
801 unlock(_nm);
802 }
803
804 CompiledMethod* code() { return _nm; }
805 void set_code(CompiledMethod* new_nm, bool zombie_ok = false) {
806 unlock(_nm); // note: This works even if _nm==new_nm.
807 _nm = new_nm;
808 lock(_nm, zombie_ok);
809 }
810 };
811
812 #endif // SHARE_CODE_NMETHOD_HPP