1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // This class is used internally by nmethods, to cache
26 // exception/pc/handler information.
27
28 class ExceptionCache : public CHeapObj {
29 friend class VMStructs;
30 private:
31 static address _unwind_handler;
32 enum { cache_size = 16 };
33 klassOop _exception_type;
34 address _pc[cache_size];
35 address _handler[cache_size];
36 int _count;
37 ExceptionCache* _next;
38
39 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
40 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
41 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
42 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
43 int count() { return _count; }
44 void increment_count() { _count++; }
45
46 public:
47
48 ExceptionCache(Handle exception, address pc, address handler);
49
50 klassOop exception_type() { return _exception_type; }
51 klassOop* exception_type_addr() { return &_exception_type; }
52 ExceptionCache* next() { return _next; }
53 void set_next(ExceptionCache *ec) { _next = ec; }
54
55 address match(Handle exception, address pc);
56 bool match_exception_with_space(Handle exception) ;
57 address test_address(address addr);
58 bool add_address_and_handler(address addr, address handler) ;
59
60 static address unwind_handler() { return _unwind_handler; }
61 };
62
63
64 // cache pc descs found in earlier inquiries
65 class PcDescCache VALUE_OBJ_CLASS_SPEC {
66 friend class VMStructs;
67 private:
68 enum { cache_size = 4 };
69 PcDesc* _last_pc_desc; // most recent pc_desc found
70 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found
71 public:
72 PcDescCache() { debug_only(_last_pc_desc = NULL); }
73 void reset_to(PcDesc* initial_pc_desc);
74 PcDesc* find_pc_desc(int pc_offset, bool approximate);
75 void add_pc_desc(PcDesc* pc_desc);
76 PcDesc* last_pc_desc() { return _last_pc_desc; }
77 };
78
79
80 // nmethods (native methods) are the compiled code versions of Java methods.
81 //
82 // An nmethod contains:
83 // - header (the nmethod structure)
84 // [Relocation]
85 // - relocation information
86 // - constant part (doubles, longs and floats used in nmethod)
87 // - oop table
88 // [Code]
89 // - code body
90 // - exception handler
91 // - stub code
92 // [Debugging information]
93 // - oop array
94 // - data array
95 // - pcs
96 // [Exception handler table]
97 // - handler entry point array
98 // [Implicit Null Pointer exception table]
99 // - implicit null table array
100
101 class Dependencies;
102 class ExceptionHandlerTable;
103 class ImplicitExceptionTable;
104 class AbstractCompiler;
105 class xmlStream;
106
107 class nmethod : public CodeBlob {
108 friend class VMStructs;
109 friend class NMethodSweeper;
110 friend class CodeCache; // non-perm oops
111 private:
112 // Shared fields for all nmethod's
113 methodOop _method;
114 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
115 jmethodID _jmethod_id; // Cache of method()->jmethod_id()
116
117 // To support simple linked-list chaining of nmethods:
118 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
119 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
120 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
121
122 static nmethod* volatile _oops_do_mark_nmethods;
123 nmethod* volatile _oops_do_mark_link;
124
125 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
126
127 // offsets for entry points
128 address _entry_point; // entry point with class check
129 address _verified_entry_point; // entry point without class check
130 address _osr_entry_point; // entry point for on stack replacement
131
132 // Offsets for different nmethod parts
133 int _exception_offset;
134 // All deoptee's will resume execution at this location described by
135 // this offset.
136 int _deoptimize_offset;
137 // All deoptee's at a MethodHandle call site will resume execution
138 // at this location described by this offset.
139 int _deoptimize_mh_offset;
140 // Offset of the unwind handler if it exists
141 int _unwind_handler_offset;
142
143 #ifdef HAVE_DTRACE_H
144 int _trap_offset;
145 #endif // def HAVE_DTRACE_H
146 int _consts_offset;
147 int _stub_offset;
148 int _oops_offset; // offset to where embedded oop table begins (inside data)
149 int _scopes_data_offset;
150 int _scopes_pcs_offset;
151 int _dependencies_offset;
152 int _handler_table_offset;
153 int _nul_chk_table_offset;
154 int _nmethod_end_offset;
155
156 // location in frame (offset for sp) that deopt can store the original
157 // pc during a deopt.
158 int _orig_pc_offset;
159
160 int _compile_id; // which compilation made this nmethod
161 int _comp_level; // compilation level
162
163 // protected by CodeCache_lock
164 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
165 bool _speculatively_disconnected; // Marked for potential unload
166
167 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
168 bool _marked_for_deoptimization; // Used for stack deoptimization
169
170 // used by jvmti to track if an unload event has been posted for this nmethod.
171 bool _unload_reported;
172
173 // set during construction
174 unsigned int _has_unsafe_access:1; // May fault due to unsafe access.
175 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
176
177 // Protected by Patching_lock
178 unsigned char _state; // {alive, not_entrant, zombie, unloaded)
179
180 #ifdef ASSERT
181 bool _oops_are_stale; // indicates that it's no longer safe to access oops section
182 #endif
183
184 enum { alive = 0,
185 not_entrant = 1, // uncommon trap has happened but activations may still exist
186 zombie = 2,
187 unloaded = 3 };
188
189
190 jbyte _scavenge_root_state;
191
192 NOT_PRODUCT(bool _has_debug_info; )
193
194 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
195 jint _lock_count;
196
197 // not_entrant method removal. Each mark_sweep pass will update
198 // this mark to current sweep invocation count if it is seen on the
199 // stack. An not_entrant method can be removed when there is no
200 // more activations, i.e., when the _stack_traversal_mark is less than
201 // current sweep traversal index.
202 long _stack_traversal_mark;
203
204 ExceptionCache *_exception_cache;
205 PcDescCache _pc_desc_cache;
206
207 // These are only used for compiled synchronized native methods to
208 // locate the owner and stack slot for the BasicLock so that we can
209 // properly revoke the bias of the owner if necessary. They are
210 // needed because there is no debug information for compiled native
211 // wrappers and the oop maps are insufficient to allow
212 // frame::retrieve_receiver() to work. Currently they are expected
213 // to be byte offsets from the Java stack pointer for maximum code
214 // sharing between platforms. Note that currently biased locking
215 // will never cause Class instances to be biased but this code
216 // handles the static synchronized case as well.
217 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
218 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
219
220 friend class nmethodLocker;
221
222 // For native wrappers
223 nmethod(methodOop method,
224 int nmethod_size,
225 CodeOffsets* offsets,
226 CodeBuffer *code_buffer,
227 int frame_size,
228 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
229 ByteSize basic_lock_sp_offset, /* synchronized natives only */
230 OopMapSet* oop_maps);
231
232 #ifdef HAVE_DTRACE_H
233 // For native wrappers
234 nmethod(methodOop method,
235 int nmethod_size,
236 CodeOffsets* offsets,
237 CodeBuffer *code_buffer,
238 int frame_size);
239 #endif // def HAVE_DTRACE_H
240
241 // Creation support
242 nmethod(methodOop method,
243 int nmethod_size,
244 int compile_id,
245 int entry_bci,
246 CodeOffsets* offsets,
247 int orig_pc_offset,
248 DebugInformationRecorder *recorder,
249 Dependencies* dependencies,
250 CodeBuffer *code_buffer,
251 int frame_size,
252 OopMapSet* oop_maps,
253 ExceptionHandlerTable* handler_table,
254 ImplicitExceptionTable* nul_chk_table,
255 AbstractCompiler* compiler,
256 int comp_level);
257
258 // helper methods
259 void* operator new(size_t size, int nmethod_size);
260
261 const char* reloc_string_for(u_char* begin, u_char* end);
262 // Returns true if this thread changed the state of the nmethod or
263 // false if another thread performed the transition.
264 bool make_not_entrant_or_zombie(unsigned int state);
265 void inc_decompile_count();
266
267 // Used to manipulate the exception cache
268 void add_exception_cache_entry(ExceptionCache* new_entry);
269 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
270
271 // Inform external interfaces that a compiled method has been unloaded
272 void post_compiled_method_unload();
273
274 // Initailize fields to their default values
275 void init_defaults();
276
277 public:
278 // create nmethod with entry_bci
279 static nmethod* new_nmethod(methodHandle method,
280 int compile_id,
281 int entry_bci,
282 CodeOffsets* offsets,
283 int orig_pc_offset,
284 DebugInformationRecorder* recorder,
285 Dependencies* dependencies,
286 CodeBuffer *code_buffer,
287 int frame_size,
288 OopMapSet* oop_maps,
289 ExceptionHandlerTable* handler_table,
290 ImplicitExceptionTable* nul_chk_table,
291 AbstractCompiler* compiler,
292 int comp_level);
293
294 static nmethod* new_native_nmethod(methodHandle method,
295 CodeBuffer *code_buffer,
296 int vep_offset,
297 int frame_complete,
298 int frame_size,
299 ByteSize receiver_sp_offset,
300 ByteSize basic_lock_sp_offset,
301 OopMapSet* oop_maps);
302
303 #ifdef HAVE_DTRACE_H
304 // The method we generate for a dtrace probe has to look
305 // like an nmethod as far as the rest of the system is concerned
306 // which is somewhat unfortunate.
307 static nmethod* new_dtrace_nmethod(methodHandle method,
308 CodeBuffer *code_buffer,
309 int vep_offset,
310 int trap_offset,
311 int frame_complete,
312 int frame_size);
313
314 int trap_offset() const { return _trap_offset; }
315 address trap_address() const { return insts_begin() + _trap_offset; }
316
317 #endif // def HAVE_DTRACE_H
318
319 // accessors
320 methodOop method() const { return _method; }
321 AbstractCompiler* compiler() const { return _compiler; }
322
323 #ifndef PRODUCT
324 bool has_debug_info() const { return _has_debug_info; }
325 void set_has_debug_info(bool f) { _has_debug_info = false; }
326 #endif // NOT PRODUCT
327
328 // type info
329 bool is_nmethod() const { return true; }
330 bool is_java_method() const { return !method()->is_native(); }
331 bool is_native_method() const { return method()->is_native(); }
332 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
333
334 bool is_compiled_by_c1() const;
335 bool is_compiled_by_c2() const;
336 bool is_compiled_by_shark() const;
337
338 // boundaries for different parts
339 address consts_begin () const { return header_begin() + _consts_offset ; }
340 address consts_end () const { return header_begin() + code_offset() ; }
341 address insts_begin () const { return header_begin() + code_offset() ; }
342 address insts_end () const { return header_begin() + _stub_offset ; }
343 address stub_begin () const { return header_begin() + _stub_offset ; }
344 address stub_end () const { return header_begin() + _oops_offset ; }
345 address exception_begin () const { return header_begin() + _exception_offset ; }
346 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
347 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
348 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
349 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
350 oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; }
351
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 // Sizes
364 int consts_size () const { return consts_end () - consts_begin (); }
365 int insts_size () const { return insts_end () - insts_begin (); }
366 int stub_size () const { return stub_end () - stub_begin (); }
367 int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
368 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
369 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
370 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
371 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
372 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
373
374 int total_size () const;
375
376 // Containment
377 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
378 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
379 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
380 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
381 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
382 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
383 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
384 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
385
386 // entry points
387 address entry_point() const { return _entry_point; } // normal entry point
388 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
389
390 // flag accessing and manipulation
391 bool is_in_use() const { return _state == alive; }
392 bool is_alive() const { return _state == alive || _state == not_entrant; }
393 bool is_not_entrant() const { return _state == not_entrant; }
394 bool is_zombie() const { return _state == zombie; }
395 bool is_unloaded() const { return _state == unloaded; }
396
397 // Make the nmethod non entrant. The nmethod will continue to be
398 // alive. It is used when an uncommon trap happens. Returns true
399 // if this thread changed the state of the nmethod or false if
400 // another thread performed the transition.
401 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
402 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
403
404 // used by jvmti to track if the unload event has been reported
405 bool unload_reported() { return _unload_reported; }
406 void set_unload_reported() { _unload_reported = true; }
407
408 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; }
409 void mark_for_deoptimization() { _marked_for_deoptimization = true; }
410
411 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
412
413 bool has_dependencies() { return dependencies_size() != 0; }
414 void flush_dependencies(BoolObjectClosure* is_alive);
415 bool has_flushed_dependencies() { return _has_flushed_dependencies; }
416 void set_has_flushed_dependencies() {
417 assert(!has_flushed_dependencies(), "should only happen once");
418 _has_flushed_dependencies = 1;
419 }
420
421 bool is_marked_for_reclamation() const { return _marked_for_reclamation; }
422 void mark_for_reclamation() { _marked_for_reclamation = 1; }
423
424 bool has_unsafe_access() const { return _has_unsafe_access; }
425 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
426
427 bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
428 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
429
430 bool is_speculatively_disconnected() const { return _speculatively_disconnected; }
431 void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; }
432
433 int comp_level() const { return _comp_level; }
434
435 // Support for oops in scopes and relocs:
436 // Note: index 0 is reserved for null.
437 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
438 oop* oop_addr_at(int index) const { // for GC
439 // relocation indexes are biased by 1 (because 0 is reserved)
440 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
441 assert(!_oops_are_stale, "oops are stale");
442 return &oops_begin()[index - 1];
443 }
444
445 void copy_oops(GrowableArray<jobject>* oops);
446
447 // Relocation support
448 private:
449 void fix_oop_relocations(address begin, address end, bool initialize_immediates);
450 inline void initialize_immediate_oop(oop* dest, jobject handle);
451
452 public:
453 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
454 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
455
456 bool is_at_poll_return(address pc);
457 bool is_at_poll_or_poll_return(address pc);
458
459 // Non-perm oop support
460 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
461 protected:
462 enum { npl_on_list = 0x01, npl_marked = 0x10 };
463 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
464 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
465 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
466 #ifndef PRODUCT
467 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
468 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
469 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
470 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
471 #endif //PRODUCT
472 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
473 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
474
475 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
476 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
477
478 public:
479
480 // Sweeper support
481 long stack_traversal_mark() { return _stack_traversal_mark; }
482 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
483
484 // Exception cache support
485 ExceptionCache* exception_cache() const { return _exception_cache; }
486 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
487 address handler_for_exception_and_pc(Handle exception, address pc);
488 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
489 void remove_from_exception_cache(ExceptionCache* ec);
490
491 // implicit exceptions support
492 address continuation_for_implicit_exception(address pc);
493
494 // On-stack replacement support
495 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
496 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
497 void invalidate_osr_method();
498 nmethod* osr_link() const { return _osr_link; }
499 void set_osr_link(nmethod *n) { _osr_link = n; }
500
501 // tells whether frames described by this nmethod can be deoptimized
502 // note: native wrappers cannot be deoptimized.
503 bool can_be_deoptimized() const { return is_java_method(); }
504
505 // Inline cache support
506 void clear_inline_caches();
507 void cleanup_inline_caches();
508 bool inlinecache_check_contains(address addr) const {
509 return (addr >= code_begin() && addr < verified_entry_point());
510 }
511
512 // unlink and deallocate this nmethod
513 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
514 // expected to use any other private methods/data in this class.
515
516 protected:
517 void flush();
518
519 public:
520 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
521 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
522 bool is_locked_by_vm() const { return _lock_count >0; }
523
524 // See comment at definition of _last_seen_on_stack
525 void mark_as_seen_on_stack();
526 bool can_not_entrant_be_converted();
527
528 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
529 void set_method(methodOop method) { _method = method; }
530
531 // GC support
532 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
533 bool unloading_occurred);
534 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
535 oop* root, bool unloading_occurred);
536
537 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
538 OopClosure* f);
539 void oops_do(OopClosure* f) { oops_do(f, false); }
540 void oops_do(OopClosure* f, bool do_strong_roots_only);
541 bool detect_scavenge_root_oops();
542 void verify_scavenge_root_oops() PRODUCT_RETURN;
543
544 bool test_set_oops_do_mark();
545 static void oops_do_marking_prologue();
546 static void oops_do_marking_epilogue();
547 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
548 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
549
550 // ScopeDesc for an instruction
551 ScopeDesc* scope_desc_at(address pc);
552
553 private:
554 ScopeDesc* scope_desc_in(address begin, address end);
555
556 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
557
558 PcDesc* find_pc_desc_internal(address pc, bool approximate);
559
560 PcDesc* find_pc_desc(address pc, bool approximate) {
561 PcDesc* desc = _pc_desc_cache.last_pc_desc();
562 if (desc != NULL && desc->pc_offset() == pc - code_begin()) {
563 return desc;
564 }
565 return find_pc_desc_internal(pc, approximate);
566 }
567
568 public:
569 // ScopeDesc retrieval operation
570 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
571 // pc_desc_near returns the first PcDesc at or after the givne pc.
572 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
573
574 public:
575 // copying of debugging information
576 void copy_scopes_pcs(PcDesc* pcs, int count);
577 void copy_scopes_data(address buffer, int size);
578
579 // Deopt
580 // Return true is the PC is one would expect if the frame is being deopted.
581 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
582 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
583 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
584 // Accessor/mutator for the original pc of a frame before a frame was deopted.
585 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
586 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
587
588 static address get_deopt_original_pc(const frame* fr);
589
590 // MethodHandle
591 bool is_method_handle_return(address return_pc);
592
593 // jvmti support:
594 void post_compiled_method_load_event();
595 jmethodID get_and_cache_jmethod_id();
596
597 // verify operations
598 void verify();
599 void verify_scopes();
600 void verify_interrupt_point(address interrupt_point);
601
602 // print compilation helper
603 static void print_compilation(outputStream *st, const char *method_name, const char *title,
604 methodOop method, bool is_blocking, int compile_id, int bci, int comp_level);
605
606 // printing support
607 void print() const;
608 void print_code();
609 void print_relocations() PRODUCT_RETURN;
610 void print_pcs() PRODUCT_RETURN;
611 void print_scopes() PRODUCT_RETURN;
612 void print_dependencies() PRODUCT_RETURN;
613 void print_value_on(outputStream* st) const PRODUCT_RETURN;
614 void print_calls(outputStream* st) PRODUCT_RETURN;
615 void print_handler_table() PRODUCT_RETURN;
616 void print_nul_chk_table() PRODUCT_RETURN;
617 void print_nmethod(bool print_code);
618
619 // need to re-define this from CodeBlob else the overload hides it
620 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
621 void print_on(outputStream* st, const char* title) const;
622
623 // Logging
624 void log_identity(xmlStream* log) const;
625 void log_new_nmethod() const;
626 void log_state_change() const;
627
628 // Prints block-level comments, including nmethod specific block labels:
629 virtual void print_block_comment(outputStream* stream, address block_begin) {
630 print_nmethod_labels(stream, block_begin);
631 CodeBlob::print_block_comment(stream, block_begin);
632 }
633 void print_nmethod_labels(outputStream* stream, address block_begin);
634
635 // Prints a comment for one native instruction (reloc info, pc desc)
636 void print_code_comment_on(outputStream* st, int column, address begin, address end);
637 static void print_statistics() PRODUCT_RETURN;
638
639 // Compiler task identification. Note that all OSR methods
640 // are numbered in an independent sequence if CICountOSR is true,
641 // and native method wrappers are also numbered independently if
642 // CICountNative is true.
643 int compile_id() const { return _compile_id; }
644 const char* compile_kind() const;
645
646 // For debugging
647 // CompiledIC* IC_at(char* p) const;
648 // PrimitiveIC* primitiveIC_at(char* p) const;
649 oop embeddedOop_at(address p);
650
651 // tells if any of this method's dependencies have been invalidated
652 // (this is expensive!)
653 bool check_all_dependencies();
654
655 // tells if this compiled method is dependent on the given changes,
656 // and the changes have invalidated it
657 bool check_dependency_on(DepChange& changes);
658
659 // Evolution support. Tells if this compiled method is dependent on any of
660 // methods m() of class dependee, such that if m() in dependee is replaced,
661 // this compiled method will have to be deoptimized.
662 bool is_evol_dependent_on(klassOop dependee);
663
664 // Fast breakpoint support. Tells if this compiled method is
665 // dependent on the given method. Returns true if this nmethod
666 // corresponds to the given method as well.
667 bool is_dependent_on_method(methodOop dependee);
668
669 // is it ok to patch at address?
670 bool is_patchable_at(address instr_address);
671
672 // UseBiasedLocking support
673 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
674 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
675 }
676 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
677 return _compiled_synchronized_native_basic_lock_sp_offset;
678 }
679
680 // support for code generation
681 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
682 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
683 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
684
685 };
686
687 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
688 class nmethodLocker : public StackObj {
689 nmethod* _nm;
690
691 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
692 static void unlock_nmethod(nmethod* nm); // (ditto)
693
694 public:
695 nmethodLocker(address pc); // derive nm from pc
696 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
697 nmethodLocker() { _nm = NULL; }
698 ~nmethodLocker() { unlock_nmethod(_nm); }
699
700 nmethod* code() { return _nm; }
701 void set_code(nmethod* new_nm) {
702 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
703 _nm = new_nm;
704 lock_nmethod(_nm);
705 }
706 };