1 /*
2 * Copyright 1997-2010 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // This class is used internally by nmethods, to cache
26 // exception/pc/handler information.
27
28 class ExceptionCache : public CHeapObj {
29 friend class VMStructs;
30 private:
31 static address _unwind_handler;
32 enum { cache_size = 16 };
33 klassOop _exception_type;
34 address _pc[cache_size];
35 address _handler[cache_size];
36 int _count;
37 ExceptionCache* _next;
38
39 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
40 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
41 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
42 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
43 int count() { return _count; }
44 void increment_count() { _count++; }
45
46 public:
47
48 ExceptionCache(Handle exception, address pc, address handler);
49
50 klassOop exception_type() { return _exception_type; }
51 klassOop* exception_type_addr() { return &_exception_type; }
52 ExceptionCache* next() { return _next; }
53 void set_next(ExceptionCache *ec) { _next = ec; }
54
55 address match(Handle exception, address pc);
56 bool match_exception_with_space(Handle exception) ;
57 address test_address(address addr);
58 bool add_address_and_handler(address addr, address handler) ;
59
60 static address unwind_handler() { return _unwind_handler; }
61 };
62
63
64 // cache pc descs found in earlier inquiries
65 class PcDescCache VALUE_OBJ_CLASS_SPEC {
66 friend class VMStructs;
67 private:
68 enum { cache_size = 4 };
69 PcDesc* _last_pc_desc; // most recent pc_desc found
70 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found
71 public:
72 PcDescCache() { debug_only(_last_pc_desc = NULL); }
73 void reset_to(PcDesc* initial_pc_desc);
74 PcDesc* find_pc_desc(int pc_offset, bool approximate);
75 void add_pc_desc(PcDesc* pc_desc);
76 PcDesc* last_pc_desc() { return _last_pc_desc; }
77 };
78
79
80 // nmethods (native methods) are the compiled code versions of Java methods.
81
82 struct nmFlags {
83 friend class VMStructs;
84 unsigned int version:8; // version number (0 = first version)
85 unsigned int level:4; // optimization level
86 unsigned int age:4; // age (in # of sweep steps)
87
88 unsigned int state:2; // {alive, zombie, unloaded)
89
90 unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap?
91 unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures
92 unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies
93 unsigned int markedForReclamation:1; // Used by NMethodSweeper
94
95 unsigned int has_unsafe_access:1; // May fault due to unsafe access.
96 unsigned int has_method_handle_invokes:1; // Has this method MethodHandle invokes?
97
98 unsigned int speculatively_disconnected:1; // Marked for potential unload
99
100 void clear();
101 };
102
103
104 // A nmethod contains:
105 // - header (the nmethod structure)
106 // [Relocation]
107 // - relocation information
108 // - constant part (doubles, longs and floats used in nmethod)
109 // [Code]
110 // - code body
111 // - exception handler
112 // - stub code
113 // [Debugging information]
114 // - oop array
115 // - data array
116 // - pcs
117 // [Exception handler table]
118 // - handler entry point array
119 // [Implicit Null Pointer exception table]
120 // - implicit null table array
121
122 class Dependencies;
123 class ExceptionHandlerTable;
124 class ImplicitExceptionTable;
125 class AbstractCompiler;
126 class xmlStream;
127
128 class nmethod : public CodeBlob {
129 friend class VMStructs;
130 friend class NMethodSweeper;
131 friend class CodeCache; // non-perm oops
132 private:
133 // Shared fields for all nmethod's
134 static int _zombie_instruction_size;
135
136 methodOop _method;
137 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
138
139 // To support simple linked-list chaining of nmethods:
140 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
141 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
142 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
143
144 static nmethod* volatile _oops_do_mark_nmethods;
145 nmethod* volatile _oops_do_mark_link;
146
147 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
148
149 // Offsets for different nmethod parts
150 int _exception_offset;
151 // All deoptee's will resume execution at this location described by
152 // this offset.
153 int _deoptimize_offset;
154 // All deoptee's at a MethodHandle call site will resume execution
155 // at this location described by this offset.
156 int _deoptimize_mh_offset;
157 // Offset of the unwind handler if it exists
158 int _unwind_handler_offset;
159
160 #ifdef HAVE_DTRACE_H
161 int _trap_offset;
162 #endif // def HAVE_DTRACE_H
163 int _stub_offset;
164 int _consts_offset;
165 int _scopes_data_offset;
166 int _scopes_pcs_offset;
167 int _dependencies_offset;
168 int _handler_table_offset;
169 int _nul_chk_table_offset;
170 int _nmethod_end_offset;
171
172 // location in frame (offset for sp) that deopt can store the original
173 // pc during a deopt.
174 int _orig_pc_offset;
175
176 int _compile_id; // which compilation made this nmethod
177 int _comp_level; // compilation level
178
179 // offsets for entry points
180 address _entry_point; // entry point with class check
181 address _verified_entry_point; // entry point without class check
182 address _osr_entry_point; // entry point for on stack replacement
183
184 nmFlags flags; // various flags to keep track of nmethod state
185 bool _markedForDeoptimization; // Used for stack deoptimization
186 enum { alive = 0,
187 not_entrant = 1, // uncommon trap has happened but activations may still exist
188 zombie = 2,
189 unloaded = 3 };
190
191 // used by jvmti to track if an unload event has been posted for this nmethod.
192 bool _unload_reported;
193
194 jbyte _scavenge_root_state;
195
196 NOT_PRODUCT(bool _has_debug_info; )
197
198 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
199 jint _lock_count;
200
201 // not_entrant method removal. Each mark_sweep pass will update
202 // this mark to current sweep invocation count if it is seen on the
203 // stack. An not_entrant method can be removed when there is no
204 // more activations, i.e., when the _stack_traversal_mark is less than
205 // current sweep traversal index.
206 long _stack_traversal_mark;
207
208 ExceptionCache *_exception_cache;
209 PcDescCache _pc_desc_cache;
210
211 // These are only used for compiled synchronized native methods to
212 // locate the owner and stack slot for the BasicLock so that we can
213 // properly revoke the bias of the owner if necessary. They are
214 // needed because there is no debug information for compiled native
215 // wrappers and the oop maps are insufficient to allow
216 // frame::retrieve_receiver() to work. Currently they are expected
217 // to be byte offsets from the Java stack pointer for maximum code
218 // sharing between platforms. Note that currently biased locking
219 // will never cause Class instances to be biased but this code
220 // handles the static synchronized case as well.
221 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
222 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
223
224 friend class nmethodLocker;
225
226 // For native wrappers
227 nmethod(methodOop method,
228 int nmethod_size,
229 CodeOffsets* offsets,
230 CodeBuffer *code_buffer,
231 int frame_size,
232 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
233 ByteSize basic_lock_sp_offset, /* synchronized natives only */
234 OopMapSet* oop_maps);
235
236 #ifdef HAVE_DTRACE_H
237 // For native wrappers
238 nmethod(methodOop method,
239 int nmethod_size,
240 CodeOffsets* offsets,
241 CodeBuffer *code_buffer,
242 int frame_size);
243 #endif // def HAVE_DTRACE_H
244
245 // Creation support
246 nmethod(methodOop method,
247 int nmethod_size,
248 int compile_id,
249 int entry_bci,
250 CodeOffsets* offsets,
251 int orig_pc_offset,
252 DebugInformationRecorder *recorder,
253 Dependencies* dependencies,
254 CodeBuffer *code_buffer,
255 int frame_size,
256 OopMapSet* oop_maps,
257 ExceptionHandlerTable* handler_table,
258 ImplicitExceptionTable* nul_chk_table,
259 AbstractCompiler* compiler,
260 int comp_level);
261
262 // helper methods
263 void* operator new(size_t size, int nmethod_size);
264
265 const char* reloc_string_for(u_char* begin, u_char* end);
266 // Returns true if this thread changed the state of the nmethod or
267 // false if another thread performed the transition.
268 bool make_not_entrant_or_zombie(unsigned int state);
269 void inc_decompile_count();
270
271 // used to check that writes to nmFlags are done consistently.
272 static void check_safepoint() PRODUCT_RETURN;
273
274 // Used to manipulate the exception cache
275 void add_exception_cache_entry(ExceptionCache* new_entry);
276 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
277
278 // Inform external interfaces that a compiled method has been unloaded
279 inline void post_compiled_method_unload();
280
281 public:
282 // create nmethod with entry_bci
283 static nmethod* new_nmethod(methodHandle method,
284 int compile_id,
285 int entry_bci,
286 CodeOffsets* offsets,
287 int orig_pc_offset,
288 DebugInformationRecorder* recorder,
289 Dependencies* dependencies,
290 CodeBuffer *code_buffer,
291 int frame_size,
292 OopMapSet* oop_maps,
293 ExceptionHandlerTable* handler_table,
294 ImplicitExceptionTable* nul_chk_table,
295 AbstractCompiler* compiler,
296 int comp_level);
297
298 static nmethod* new_native_nmethod(methodHandle method,
299 CodeBuffer *code_buffer,
300 int vep_offset,
301 int frame_complete,
302 int frame_size,
303 ByteSize receiver_sp_offset,
304 ByteSize basic_lock_sp_offset,
305 OopMapSet* oop_maps);
306
307 #ifdef HAVE_DTRACE_H
308 // The method we generate for a dtrace probe has to look
309 // like an nmethod as far as the rest of the system is concerned
310 // which is somewhat unfortunate.
311 static nmethod* new_dtrace_nmethod(methodHandle method,
312 CodeBuffer *code_buffer,
313 int vep_offset,
314 int trap_offset,
315 int frame_complete,
316 int frame_size);
317
318 int trap_offset() const { return _trap_offset; }
319 address trap_address() const { return code_begin() + _trap_offset; }
320
321 #endif // def HAVE_DTRACE_H
322
323 // accessors
324 methodOop method() const { return _method; }
325 AbstractCompiler* compiler() const { return _compiler; }
326
327 #ifndef PRODUCT
328 bool has_debug_info() const { return _has_debug_info; }
329 void set_has_debug_info(bool f) { _has_debug_info = false; }
330 #endif // NOT PRODUCT
331
332 // type info
333 bool is_nmethod() const { return true; }
334 bool is_java_method() const { return !method()->is_native(); }
335 bool is_native_method() const { return method()->is_native(); }
336 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
337
338 bool is_compiled_by_c1() const;
339 bool is_compiled_by_c2() const;
340
341 // boundaries for different parts
342 address code_begin () const { return _entry_point; }
343 address code_end () const { return header_begin() + _stub_offset ; }
344 address exception_begin () const { return header_begin() + _exception_offset ; }
345 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
346 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
347 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
348 address stub_begin () const { return header_begin() + _stub_offset ; }
349 address stub_end () const { return header_begin() + _consts_offset ; }
350 address consts_begin () const { return header_begin() + _consts_offset ; }
351 address consts_end () const { return header_begin() + _scopes_data_offset ; }
352 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
353 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
354 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
355 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
356 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
357 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
358 address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
359 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
360 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
361 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
362
363 int code_size () const { return code_end () - code_begin (); }
364 int stub_size () const { return stub_end () - stub_begin (); }
365 int consts_size () const { return consts_end () - consts_begin (); }
366 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
367 int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); }
368 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
369 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
370 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
371
372 int total_size () const;
373
374 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
375 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
376 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
377 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
378 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
379 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
380 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
381
382 // entry points
383 address entry_point() const { return _entry_point; } // normal entry point
384 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
385
386 // flag accessing and manipulation
387 bool is_in_use() const { return flags.state == alive; }
388 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
389 bool is_not_entrant() const { return flags.state == not_entrant; }
390 bool is_zombie() const { return flags.state == zombie; }
391 bool is_unloaded() const { return flags.state == unloaded; }
392
393 // Make the nmethod non entrant. The nmethod will continue to be
394 // alive. It is used when an uncommon trap happens. Returns true
395 // if this thread changed the state of the nmethod or false if
396 // another thread performed the transition.
397 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
398 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
399
400 // used by jvmti to track if the unload event has been reported
401 bool unload_reported() { return _unload_reported; }
402 void set_unload_reported() { _unload_reported = true; }
403
404 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; }
405 void mark_for_deoptimization() { _markedForDeoptimization = true; }
406
407 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
408
409 bool has_dependencies() { return dependencies_size() != 0; }
410 void flush_dependencies(BoolObjectClosure* is_alive);
411 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; }
412 void set_has_flushed_dependencies() {
413 check_safepoint();
414 assert(!has_flushed_dependencies(), "should only happen once");
415 flags.hasFlushedDependencies = 1;
416 }
417
418 bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
419 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; }
420 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; }
421
422 bool has_unsafe_access() const { return flags.has_unsafe_access; }
423 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
424
425 bool has_method_handle_invokes() const { return flags.has_method_handle_invokes; }
426 void set_has_method_handle_invokes(bool z) { flags.has_method_handle_invokes = z; }
427
428 bool is_speculatively_disconnected() const { return flags.speculatively_disconnected; }
429 void set_speculatively_disconnected(bool z) { flags.speculatively_disconnected = z; }
430
431 int level() const { return flags.level; }
432 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; }
433
434 int comp_level() const { return _comp_level; }
435
436 int version() const { return flags.version; }
437 void set_version(int v);
438
439 // Non-perm oop support
440 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
441 protected:
442 enum { npl_on_list = 0x01, npl_marked = 0x10 };
443 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
444 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
445 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
446 #ifndef PRODUCT
447 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
448 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
449 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
450 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
451 #endif //PRODUCT
452 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
453 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
454
455 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
456 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
457
458 public:
459
460 // Sweeper support
461 long stack_traversal_mark() { return _stack_traversal_mark; }
462 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
463
464 // Exception cache support
465 ExceptionCache* exception_cache() const { return _exception_cache; }
466 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
467 address handler_for_exception_and_pc(Handle exception, address pc);
468 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
469 void remove_from_exception_cache(ExceptionCache* ec);
470
471 // implicit exceptions support
472 address continuation_for_implicit_exception(address pc);
473
474 // On-stack replacement support
475 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
476 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
477 void invalidate_osr_method();
478 nmethod* osr_link() const { return _osr_link; }
479 void set_osr_link(nmethod *n) { _osr_link = n; }
480
481 // tells whether frames described by this nmethod can be deoptimized
482 // note: native wrappers cannot be deoptimized.
483 bool can_be_deoptimized() const { return is_java_method(); }
484
485 // Inline cache support
486 void clear_inline_caches();
487 void cleanup_inline_caches();
488 bool inlinecache_check_contains(address addr) const {
489 return (addr >= instructions_begin() && addr < verified_entry_point());
490 }
491
492 // unlink and deallocate this nmethod
493 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
494 // expected to use any other private methods/data in this class.
495
496 protected:
497 void flush();
498
499 public:
500 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
501 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
502 bool is_locked_by_vm() const { return _lock_count >0; }
503
504 // See comment at definition of _last_seen_on_stack
505 void mark_as_seen_on_stack();
506 bool can_not_entrant_be_converted();
507
508 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
509 void set_method(methodOop method) { _method = method; }
510
511 // GC support
512 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
513 bool unloading_occurred);
514 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
515 oop* root, bool unloading_occurred);
516
517 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
518 OopClosure* f);
519 virtual void oops_do(OopClosure* f) { oops_do(f, false); }
520 void oops_do(OopClosure* f, bool do_strong_roots_only);
521 bool detect_scavenge_root_oops();
522 void verify_scavenge_root_oops() PRODUCT_RETURN;
523
524 bool test_set_oops_do_mark();
525 static void oops_do_marking_prologue();
526 static void oops_do_marking_epilogue();
527 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
528 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
529
530 // ScopeDesc for an instruction
531 ScopeDesc* scope_desc_at(address pc);
532
533 private:
534 ScopeDesc* scope_desc_in(address begin, address end);
535
536 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
537
538 PcDesc* find_pc_desc_internal(address pc, bool approximate);
539
540 PcDesc* find_pc_desc(address pc, bool approximate) {
541 PcDesc* desc = _pc_desc_cache.last_pc_desc();
542 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
543 return desc;
544 }
545 return find_pc_desc_internal(pc, approximate);
546 }
547
548 public:
549 // ScopeDesc retrieval operation
550 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
551 // pc_desc_near returns the first PcDesc at or after the givne pc.
552 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
553
554 public:
555 // copying of debugging information
556 void copy_scopes_pcs(PcDesc* pcs, int count);
557 void copy_scopes_data(address buffer, int size);
558
559 // Deopt
560 // Return true is the PC is one would expect if the frame is being deopted.
561 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
562 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
563 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
564 // Accessor/mutator for the original pc of a frame before a frame was deopted.
565 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
566 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
567
568 static address get_deopt_original_pc(const frame* fr);
569
570 // MethodHandle
571 bool is_method_handle_return(address return_pc);
572
573 // jvmti support:
574 void post_compiled_method_load_event();
575
576 // verify operations
577 void verify();
578 void verify_scopes();
579 void verify_interrupt_point(address interrupt_point);
580
581 // printing support
582 void print() const;
583 void print_code();
584 void print_relocations() PRODUCT_RETURN;
585 void print_pcs() PRODUCT_RETURN;
586 void print_scopes() PRODUCT_RETURN;
587 void print_dependencies() PRODUCT_RETURN;
588 void print_value_on(outputStream* st) const PRODUCT_RETURN;
589 void print_calls(outputStream* st) PRODUCT_RETURN;
590 void print_handler_table() PRODUCT_RETURN;
591 void print_nul_chk_table() PRODUCT_RETURN;
592 void print_nmethod(bool print_code);
593
594 void print_on(outputStream* st, const char* title) const;
595
596 // Logging
597 void log_identity(xmlStream* log) const;
598 void log_new_nmethod() const;
599 void log_state_change() const;
600
601 // Prints block-level comments, including nmethod specific block labels:
602 virtual void print_block_comment(outputStream* stream, address block_begin) {
603 print_nmethod_labels(stream, block_begin);
604 CodeBlob::print_block_comment(stream, block_begin);
605 }
606 void print_nmethod_labels(outputStream* stream, address block_begin);
607
608 // Prints a comment for one native instruction (reloc info, pc desc)
609 void print_code_comment_on(outputStream* st, int column, address begin, address end);
610 static void print_statistics() PRODUCT_RETURN;
611
612 // Compiler task identification. Note that all OSR methods
613 // are numbered in an independent sequence if CICountOSR is true,
614 // and native method wrappers are also numbered independently if
615 // CICountNative is true.
616 int compile_id() const { return _compile_id; }
617 const char* compile_kind() const;
618
619 // For debugging
620 // CompiledIC* IC_at(char* p) const;
621 // PrimitiveIC* primitiveIC_at(char* p) const;
622 oop embeddedOop_at(address p);
623
624 // tells if any of this method's dependencies have been invalidated
625 // (this is expensive!)
626 bool check_all_dependencies();
627
628 // tells if this compiled method is dependent on the given changes,
629 // and the changes have invalidated it
630 bool check_dependency_on(DepChange& changes);
631
632 // Evolution support. Tells if this compiled method is dependent on any of
633 // methods m() of class dependee, such that if m() in dependee is replaced,
634 // this compiled method will have to be deoptimized.
635 bool is_evol_dependent_on(klassOop dependee);
636
637 // Fast breakpoint support. Tells if this compiled method is
638 // dependent on the given method. Returns true if this nmethod
639 // corresponds to the given method as well.
640 bool is_dependent_on_method(methodOop dependee);
641
642 // is it ok to patch at address?
643 bool is_patchable_at(address instr_address);
644
645 // UseBiasedLocking support
646 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
647 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
648 }
649 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
650 return _compiled_synchronized_native_basic_lock_sp_offset;
651 }
652
653 // support for code generation
654 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
655 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
656 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
657
658 };
659
660 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
661 class nmethodLocker : public StackObj {
662 nmethod* _nm;
663
664 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
665 static void unlock_nmethod(nmethod* nm); // (ditto)
666
667 public:
668 nmethodLocker(address pc); // derive nm from pc
669 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
670 nmethodLocker() { _nm = NULL; }
671 ~nmethodLocker() { unlock_nmethod(_nm); }
672
673 nmethod* code() { return _nm; }
674 void set_code(nmethod* new_nm) {
675 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
676 _nm = new_nm;
677 lock_nmethod(_nm);
678 }
679 };