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 // - oop table
110 // [Code]
111 // - code body
112 // - exception handler
113 // - stub code
114 // [Debugging information]
115 // - oop array
116 // - data array
117 // - pcs
118 // [Exception handler table]
119 // - handler entry point array
120 // [Implicit Null Pointer exception table]
121 // - implicit null table array
122
123 class Dependencies;
124 class ExceptionHandlerTable;
125 class ImplicitExceptionTable;
126 class AbstractCompiler;
127 class xmlStream;
128
129 class nmethod : public CodeBlob {
130 friend class VMStructs;
131 friend class NMethodSweeper;
132 friend class CodeCache; // non-perm oops
133 private:
134 // Shared fields for all nmethod's
135 static int _zombie_instruction_size;
136
137 methodOop _method;
138 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
139
140 // To support simple linked-list chaining of nmethods:
141 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
142 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
143 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
144
145 static nmethod* volatile _oops_do_mark_nmethods;
146 nmethod* volatile _oops_do_mark_link;
147
148 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
149
150 // Offsets for different nmethod parts
151 int _exception_offset;
152 // All deoptee's will resume execution at this location described by
153 // this offset.
154 int _deoptimize_offset;
155 // All deoptee's at a MethodHandle call site will resume execution
156 // at this location described by this offset.
157 int _deoptimize_mh_offset;
158 // Offset of the unwind handler if it exists
159 int _unwind_handler_offset;
160
161 #ifdef HAVE_DTRACE_H
162 int _trap_offset;
163 #endif // def HAVE_DTRACE_H
164 int _stub_offset;
165 int _consts_offset;
166 int _oops_offset; // offset to where embedded oop table begins (inside data)
167 int _scopes_data_offset;
168 int _scopes_pcs_offset;
169 int _dependencies_offset;
170 int _handler_table_offset;
171 int _nul_chk_table_offset;
172 int _nmethod_end_offset;
173
174 // location in frame (offset for sp) that deopt can store the original
175 // pc during a deopt.
176 int _orig_pc_offset;
177
178 int _compile_id; // which compilation made this nmethod
179 int _comp_level; // compilation level
180
181 // offsets for entry points
182 address _entry_point; // entry point with class check
183 address _verified_entry_point; // entry point without class check
184 address _osr_entry_point; // entry point for on stack replacement
185
186 nmFlags flags; // various flags to keep track of nmethod state
187 bool _markedForDeoptimization; // Used for stack deoptimization
188 enum { alive = 0,
189 not_entrant = 1, // uncommon trap has happened but activations may still exist
190 zombie = 2,
191 unloaded = 3 };
192
193 // used by jvmti to track if an unload event has been posted for this nmethod.
194 bool _unload_reported;
195
196 jbyte _scavenge_root_state;
197
198 NOT_PRODUCT(bool _has_debug_info; )
199
200 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
201 jint _lock_count;
202
203 // not_entrant method removal. Each mark_sweep pass will update
204 // this mark to current sweep invocation count if it is seen on the
205 // stack. An not_entrant method can be removed when there is no
206 // more activations, i.e., when the _stack_traversal_mark is less than
207 // current sweep traversal index.
208 long _stack_traversal_mark;
209
210 ExceptionCache *_exception_cache;
211 PcDescCache _pc_desc_cache;
212
213 // These are only used for compiled synchronized native methods to
214 // locate the owner and stack slot for the BasicLock so that we can
215 // properly revoke the bias of the owner if necessary. They are
216 // needed because there is no debug information for compiled native
217 // wrappers and the oop maps are insufficient to allow
218 // frame::retrieve_receiver() to work. Currently they are expected
219 // to be byte offsets from the Java stack pointer for maximum code
220 // sharing between platforms. Note that currently biased locking
221 // will never cause Class instances to be biased but this code
222 // handles the static synchronized case as well.
223 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
224 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
225
226 friend class nmethodLocker;
227
228 // For native wrappers
229 nmethod(methodOop method,
230 int nmethod_size,
231 CodeOffsets* offsets,
232 CodeBuffer *code_buffer,
233 int frame_size,
234 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
235 ByteSize basic_lock_sp_offset, /* synchronized natives only */
236 OopMapSet* oop_maps);
237
238 #ifdef HAVE_DTRACE_H
239 // For native wrappers
240 nmethod(methodOop method,
241 int nmethod_size,
242 CodeOffsets* offsets,
243 CodeBuffer *code_buffer,
244 int frame_size);
245 #endif // def HAVE_DTRACE_H
246
247 // Creation support
248 nmethod(methodOop method,
249 int nmethod_size,
250 int compile_id,
251 int entry_bci,
252 CodeOffsets* offsets,
253 int orig_pc_offset,
254 DebugInformationRecorder *recorder,
255 Dependencies* dependencies,
256 CodeBuffer *code_buffer,
257 int frame_size,
258 OopMapSet* oop_maps,
259 ExceptionHandlerTable* handler_table,
260 ImplicitExceptionTable* nul_chk_table,
261 AbstractCompiler* compiler,
262 int comp_level);
263
264 // helper methods
265 void* operator new(size_t size, int nmethod_size);
266
267 const char* reloc_string_for(u_char* begin, u_char* end);
268 // Returns true if this thread changed the state of the nmethod or
269 // false if another thread performed the transition.
270 bool make_not_entrant_or_zombie(unsigned int state);
271 void inc_decompile_count();
272
273 // used to check that writes to nmFlags are done consistently.
274 static void check_safepoint() PRODUCT_RETURN;
275
276 // Used to manipulate the exception cache
277 void add_exception_cache_entry(ExceptionCache* new_entry);
278 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
279
280 // Inform external interfaces that a compiled method has been unloaded
281 inline void post_compiled_method_unload();
282
283 public:
284 // create nmethod with entry_bci
285 static nmethod* new_nmethod(methodHandle method,
286 int compile_id,
287 int entry_bci,
288 CodeOffsets* offsets,
289 int orig_pc_offset,
290 DebugInformationRecorder* recorder,
291 Dependencies* dependencies,
292 CodeBuffer *code_buffer,
293 int frame_size,
294 OopMapSet* oop_maps,
295 ExceptionHandlerTable* handler_table,
296 ImplicitExceptionTable* nul_chk_table,
297 AbstractCompiler* compiler,
298 int comp_level);
299
300 static nmethod* new_native_nmethod(methodHandle method,
301 CodeBuffer *code_buffer,
302 int vep_offset,
303 int frame_complete,
304 int frame_size,
305 ByteSize receiver_sp_offset,
306 ByteSize basic_lock_sp_offset,
307 OopMapSet* oop_maps);
308
309 #ifdef HAVE_DTRACE_H
310 // The method we generate for a dtrace probe has to look
311 // like an nmethod as far as the rest of the system is concerned
312 // which is somewhat unfortunate.
313 static nmethod* new_dtrace_nmethod(methodHandle method,
314 CodeBuffer *code_buffer,
315 int vep_offset,
316 int trap_offset,
317 int frame_complete,
318 int frame_size);
319
320 int trap_offset() const { return _trap_offset; }
321 address trap_address() const { return code_begin() + _trap_offset; }
322
323 #endif // def HAVE_DTRACE_H
324
325 // accessors
326 methodOop method() const { return _method; }
327 AbstractCompiler* compiler() const { return _compiler; }
328
329 #ifndef PRODUCT
330 bool has_debug_info() const { return _has_debug_info; }
331 void set_has_debug_info(bool f) { _has_debug_info = false; }
332 #endif // NOT PRODUCT
333
334 // type info
335 bool is_nmethod() const { return true; }
336 bool is_java_method() const { return !method()->is_native(); }
337 bool is_native_method() const { return method()->is_native(); }
338 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
339
340 bool is_compiled_by_c1() const;
341 bool is_compiled_by_c2() const;
342
343 // boundaries for different parts
344 address code_begin () const { return _entry_point; }
345 address code_end () const { return header_begin() + _stub_offset ; }
346 address exception_begin () const { return header_begin() + _exception_offset ; }
347 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
348 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
349 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
350 address stub_begin () const { return header_begin() + _stub_offset ; }
351 address stub_end () const { return header_begin() + _consts_offset ; }
352 address consts_begin () const { return header_begin() + _consts_offset ; }
353 address consts_end () const { return header_begin() + _oops_offset ; }
354 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
355 oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; }
356
357 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
358 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
359 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
360 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
361 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
362 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
363 address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
364 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
365 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
366 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
367
368 // Sizes
369 int code_size () const { return code_end () - code_begin (); }
370 int stub_size () const { return stub_end () - stub_begin (); }
371 int consts_size () const { return consts_end () - consts_begin (); }
372 int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
373 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
374 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
375 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
376 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
377 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
378
379 int total_size () const;
380
381 // Containment
382 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
383 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
384 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
385 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
386 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
387 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
388 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
389 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
390
391 // entry points
392 address entry_point() const { return _entry_point; } // normal entry point
393 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
394
395 // flag accessing and manipulation
396 bool is_in_use() const { return flags.state == alive; }
397 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
398 bool is_not_entrant() const { return flags.state == not_entrant; }
399 bool is_zombie() const { return flags.state == zombie; }
400 bool is_unloaded() const { return flags.state == unloaded; }
401
402 // Make the nmethod non entrant. The nmethod will continue to be
403 // alive. It is used when an uncommon trap happens. Returns true
404 // if this thread changed the state of the nmethod or false if
405 // another thread performed the transition.
406 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
407 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
408
409 // used by jvmti to track if the unload event has been reported
410 bool unload_reported() { return _unload_reported; }
411 void set_unload_reported() { _unload_reported = true; }
412
413 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; }
414 void mark_for_deoptimization() { _markedForDeoptimization = true; }
415
416 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
417
418 bool has_dependencies() { return dependencies_size() != 0; }
419 void flush_dependencies(BoolObjectClosure* is_alive);
420 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; }
421 void set_has_flushed_dependencies() {
422 check_safepoint();
423 assert(!has_flushed_dependencies(), "should only happen once");
424 flags.hasFlushedDependencies = 1;
425 }
426
427 bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
428 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; }
429 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; }
430
431 bool has_unsafe_access() const { return flags.has_unsafe_access; }
432 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
433
434 bool has_method_handle_invokes() const { return flags.has_method_handle_invokes; }
435 void set_has_method_handle_invokes(bool z) { flags.has_method_handle_invokes = z; }
436
437 bool is_speculatively_disconnected() const { return flags.speculatively_disconnected; }
438 void set_speculatively_disconnected(bool z) { flags.speculatively_disconnected = z; }
439
440 int level() const { return flags.level; }
441 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; }
442
443 int comp_level() const { return _comp_level; }
444
445 int version() const { return flags.version; }
446 void set_version(int v);
447
448 // Support for oops in scopes and relocs:
449 // Note: index 0 is reserved for null.
450 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
451 oop* oop_addr_at(int index) const { // for GC
452 // relocation indexes are biased by 1 (because 0 is reserved)
453 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
454 return &oops_begin()[index - 1];
455 }
456
457 void copy_oops(GrowableArray<jobject>* oops);
458
459 // Relocation support
460 private:
461 void fix_oop_relocations(address begin, address end, bool initialize_immediates);
462 inline void initialize_immediate_oop(oop* dest, jobject handle);
463
464 public:
465 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
466 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
467
468 bool is_at_poll_return(address pc);
469 bool is_at_poll_or_poll_return(address pc);
470
471 // Non-perm oop support
472 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
473 protected:
474 enum { npl_on_list = 0x01, npl_marked = 0x10 };
475 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
476 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
477 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
478 #ifndef PRODUCT
479 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
480 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
481 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
482 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
483 #endif //PRODUCT
484 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
485 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
486
487 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
488 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
489
490 public:
491
492 // Sweeper support
493 long stack_traversal_mark() { return _stack_traversal_mark; }
494 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
495
496 // Exception cache support
497 ExceptionCache* exception_cache() const { return _exception_cache; }
498 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
499 address handler_for_exception_and_pc(Handle exception, address pc);
500 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
501 void remove_from_exception_cache(ExceptionCache* ec);
502
503 // implicit exceptions support
504 address continuation_for_implicit_exception(address pc);
505
506 // On-stack replacement support
507 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
508 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
509 void invalidate_osr_method();
510 nmethod* osr_link() const { return _osr_link; }
511 void set_osr_link(nmethod *n) { _osr_link = n; }
512
513 // tells whether frames described by this nmethod can be deoptimized
514 // note: native wrappers cannot be deoptimized.
515 bool can_be_deoptimized() const { return is_java_method(); }
516
517 // Inline cache support
518 void clear_inline_caches();
519 void cleanup_inline_caches();
520 bool inlinecache_check_contains(address addr) const {
521 return (addr >= instructions_begin() && addr < verified_entry_point());
522 }
523
524 // unlink and deallocate this nmethod
525 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
526 // expected to use any other private methods/data in this class.
527
528 protected:
529 void flush();
530
531 public:
532 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
533 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
534 bool is_locked_by_vm() const { return _lock_count >0; }
535
536 // See comment at definition of _last_seen_on_stack
537 void mark_as_seen_on_stack();
538 bool can_not_entrant_be_converted();
539
540 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
541 void set_method(methodOop method) { _method = method; }
542
543 // GC support
544 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
545 bool unloading_occurred);
546 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
547 oop* root, bool unloading_occurred);
548
549 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
550 OopClosure* f);
551 void oops_do(OopClosure* f) { oops_do(f, false); }
552 void oops_do(OopClosure* f, bool do_strong_roots_only);
553 bool detect_scavenge_root_oops();
554 void verify_scavenge_root_oops() PRODUCT_RETURN;
555
556 bool test_set_oops_do_mark();
557 static void oops_do_marking_prologue();
558 static void oops_do_marking_epilogue();
559 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
560 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
561
562 // ScopeDesc for an instruction
563 ScopeDesc* scope_desc_at(address pc);
564
565 private:
566 ScopeDesc* scope_desc_in(address begin, address end);
567
568 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
569
570 PcDesc* find_pc_desc_internal(address pc, bool approximate);
571
572 PcDesc* find_pc_desc(address pc, bool approximate) {
573 PcDesc* desc = _pc_desc_cache.last_pc_desc();
574 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
575 return desc;
576 }
577 return find_pc_desc_internal(pc, approximate);
578 }
579
580 public:
581 // ScopeDesc retrieval operation
582 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
583 // pc_desc_near returns the first PcDesc at or after the givne pc.
584 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
585
586 public:
587 // copying of debugging information
588 void copy_scopes_pcs(PcDesc* pcs, int count);
589 void copy_scopes_data(address buffer, int size);
590
591 // Deopt
592 // Return true is the PC is one would expect if the frame is being deopted.
593 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
594 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
595 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
596 // Accessor/mutator for the original pc of a frame before a frame was deopted.
597 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
598 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
599
600 static address get_deopt_original_pc(const frame* fr);
601
602 // MethodHandle
603 bool is_method_handle_return(address return_pc);
604
605 // jvmti support:
606 void post_compiled_method_load_event();
607
608 // verify operations
609 void verify();
610 void verify_scopes();
611 void verify_interrupt_point(address interrupt_point);
612
613 // printing support
614 void print() const;
615 void print_code();
616 void print_relocations() PRODUCT_RETURN;
617 void print_pcs() PRODUCT_RETURN;
618 void print_scopes() PRODUCT_RETURN;
619 void print_dependencies() PRODUCT_RETURN;
620 void print_value_on(outputStream* st) const PRODUCT_RETURN;
621 void print_calls(outputStream* st) PRODUCT_RETURN;
622 void print_handler_table() PRODUCT_RETURN;
623 void print_nul_chk_table() PRODUCT_RETURN;
624 void print_nmethod(bool print_code);
625
626 void print_on(outputStream* st, const char* title) const;
627
628 // Logging
629 void log_identity(xmlStream* log) const;
630 void log_new_nmethod() const;
631 void log_state_change() const;
632
633 // Prints block-level comments, including nmethod specific block labels:
634 virtual void print_block_comment(outputStream* stream, address block_begin) {
635 print_nmethod_labels(stream, block_begin);
636 CodeBlob::print_block_comment(stream, block_begin);
637 }
638 void print_nmethod_labels(outputStream* stream, address block_begin);
639
640 // Prints a comment for one native instruction (reloc info, pc desc)
641 void print_code_comment_on(outputStream* st, int column, address begin, address end);
642 static void print_statistics() PRODUCT_RETURN;
643
644 // Compiler task identification. Note that all OSR methods
645 // are numbered in an independent sequence if CICountOSR is true,
646 // and native method wrappers are also numbered independently if
647 // CICountNative is true.
648 int compile_id() const { return _compile_id; }
649 const char* compile_kind() const;
650
651 // For debugging
652 // CompiledIC* IC_at(char* p) const;
653 // PrimitiveIC* primitiveIC_at(char* p) const;
654 oop embeddedOop_at(address p);
655
656 // tells if any of this method's dependencies have been invalidated
657 // (this is expensive!)
658 bool check_all_dependencies();
659
660 // tells if this compiled method is dependent on the given changes,
661 // and the changes have invalidated it
662 bool check_dependency_on(DepChange& changes);
663
664 // Evolution support. Tells if this compiled method is dependent on any of
665 // methods m() of class dependee, such that if m() in dependee is replaced,
666 // this compiled method will have to be deoptimized.
667 bool is_evol_dependent_on(klassOop dependee);
668
669 // Fast breakpoint support. Tells if this compiled method is
670 // dependent on the given method. Returns true if this nmethod
671 // corresponds to the given method as well.
672 bool is_dependent_on_method(methodOop dependee);
673
674 // is it ok to patch at address?
675 bool is_patchable_at(address instr_address);
676
677 // UseBiasedLocking support
678 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
679 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
680 }
681 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
682 return _compiled_synchronized_native_basic_lock_sp_offset;
683 }
684
685 // support for code generation
686 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
687 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
688 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
689
690 };
691
692 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
693 class nmethodLocker : public StackObj {
694 nmethod* _nm;
695
696 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
697 static void unlock_nmethod(nmethod* nm); // (ditto)
698
699 public:
700 nmethodLocker(address pc); // derive nm from pc
701 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
702 nmethodLocker() { _nm = NULL; }
703 ~nmethodLocker() { unlock_nmethod(_nm); }
704
705 nmethod* code() { return _nm; }
706 void set_code(nmethod* new_nm) {
707 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
708 _nm = new_nm;
709 lock_nmethod(_nm);
710 }
711 };