Thu, 08 Jul 2010 14:29:44 -0700
6965184: possible races in make_not_entrant_or_zombie
Reviewed-by: kvn
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 */
25 // This class is used internally by nmethods, to cache
26 // exception/pc/handler information.
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;
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++; }
46 public:
48 ExceptionCache(Handle exception, address pc, address handler);
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; }
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) ;
60 static address unwind_handler() { return _unwind_handler; }
61 };
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 };
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
101 class Dependencies;
102 class ExceptionHandlerTable;
103 class ImplicitExceptionTable;
104 class AbstractCompiler;
105 class xmlStream;
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()
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
122 static nmethod* volatile _oops_do_mark_nmethods;
123 nmethod* volatile _oops_do_mark_link;
125 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
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
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;
143 #ifdef HAVE_DTRACE_H
144 int _trap_offset;
145 #endif // def HAVE_DTRACE_H
146 int _stub_offset;
147 int _consts_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;
156 // location in frame (offset for sp) that deopt can store the original
157 // pc during a deopt.
158 int _orig_pc_offset;
160 int _compile_id; // which compilation made this nmethod
161 int _comp_level; // compilation level
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
167 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
168 bool _marked_for_deoptimization; // Used for stack deoptimization
170 // used by jvmti to track if an unload event has been posted for this nmethod.
171 bool _unload_reported;
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?
177 // Protected by Patching_lock
178 unsigned char _state; // {alive, not_entrant, zombie, unloaded)
180 enum { alive = 0,
181 not_entrant = 1, // uncommon trap has happened but activations may still exist
182 zombie = 2,
183 unloaded = 3 };
186 jbyte _scavenge_root_state;
188 NOT_PRODUCT(bool _has_debug_info; )
190 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
191 jint _lock_count;
193 // not_entrant method removal. Each mark_sweep pass will update
194 // this mark to current sweep invocation count if it is seen on the
195 // stack. An not_entrant method can be removed when there is no
196 // more activations, i.e., when the _stack_traversal_mark is less than
197 // current sweep traversal index.
198 long _stack_traversal_mark;
200 ExceptionCache *_exception_cache;
201 PcDescCache _pc_desc_cache;
203 // These are only used for compiled synchronized native methods to
204 // locate the owner and stack slot for the BasicLock so that we can
205 // properly revoke the bias of the owner if necessary. They are
206 // needed because there is no debug information for compiled native
207 // wrappers and the oop maps are insufficient to allow
208 // frame::retrieve_receiver() to work. Currently they are expected
209 // to be byte offsets from the Java stack pointer for maximum code
210 // sharing between platforms. Note that currently biased locking
211 // will never cause Class instances to be biased but this code
212 // handles the static synchronized case as well.
213 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
214 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
216 friend class nmethodLocker;
218 // For native wrappers
219 nmethod(methodOop method,
220 int nmethod_size,
221 CodeOffsets* offsets,
222 CodeBuffer *code_buffer,
223 int frame_size,
224 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
225 ByteSize basic_lock_sp_offset, /* synchronized natives only */
226 OopMapSet* oop_maps);
228 #ifdef HAVE_DTRACE_H
229 // For native wrappers
230 nmethod(methodOop method,
231 int nmethod_size,
232 CodeOffsets* offsets,
233 CodeBuffer *code_buffer,
234 int frame_size);
235 #endif // def HAVE_DTRACE_H
237 // Creation support
238 nmethod(methodOop method,
239 int nmethod_size,
240 int compile_id,
241 int entry_bci,
242 CodeOffsets* offsets,
243 int orig_pc_offset,
244 DebugInformationRecorder *recorder,
245 Dependencies* dependencies,
246 CodeBuffer *code_buffer,
247 int frame_size,
248 OopMapSet* oop_maps,
249 ExceptionHandlerTable* handler_table,
250 ImplicitExceptionTable* nul_chk_table,
251 AbstractCompiler* compiler,
252 int comp_level);
254 // helper methods
255 void* operator new(size_t size, int nmethod_size);
257 const char* reloc_string_for(u_char* begin, u_char* end);
258 // Returns true if this thread changed the state of the nmethod or
259 // false if another thread performed the transition.
260 bool make_not_entrant_or_zombie(unsigned int state);
261 void inc_decompile_count();
263 // Used to manipulate the exception cache
264 void add_exception_cache_entry(ExceptionCache* new_entry);
265 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
267 // Inform external interfaces that a compiled method has been unloaded
268 void post_compiled_method_unload();
270 // Initailize fields to their default values
271 void init_defaults();
273 public:
274 // create nmethod with entry_bci
275 static nmethod* new_nmethod(methodHandle method,
276 int compile_id,
277 int entry_bci,
278 CodeOffsets* offsets,
279 int orig_pc_offset,
280 DebugInformationRecorder* recorder,
281 Dependencies* dependencies,
282 CodeBuffer *code_buffer,
283 int frame_size,
284 OopMapSet* oop_maps,
285 ExceptionHandlerTable* handler_table,
286 ImplicitExceptionTable* nul_chk_table,
287 AbstractCompiler* compiler,
288 int comp_level);
290 static nmethod* new_native_nmethod(methodHandle method,
291 CodeBuffer *code_buffer,
292 int vep_offset,
293 int frame_complete,
294 int frame_size,
295 ByteSize receiver_sp_offset,
296 ByteSize basic_lock_sp_offset,
297 OopMapSet* oop_maps);
299 #ifdef HAVE_DTRACE_H
300 // The method we generate for a dtrace probe has to look
301 // like an nmethod as far as the rest of the system is concerned
302 // which is somewhat unfortunate.
303 static nmethod* new_dtrace_nmethod(methodHandle method,
304 CodeBuffer *code_buffer,
305 int vep_offset,
306 int trap_offset,
307 int frame_complete,
308 int frame_size);
310 int trap_offset() const { return _trap_offset; }
311 address trap_address() const { return code_begin() + _trap_offset; }
313 #endif // def HAVE_DTRACE_H
315 // accessors
316 methodOop method() const { return _method; }
317 AbstractCompiler* compiler() const { return _compiler; }
319 #ifndef PRODUCT
320 bool has_debug_info() const { return _has_debug_info; }
321 void set_has_debug_info(bool f) { _has_debug_info = false; }
322 #endif // NOT PRODUCT
324 // type info
325 bool is_nmethod() const { return true; }
326 bool is_java_method() const { return !method()->is_native(); }
327 bool is_native_method() const { return method()->is_native(); }
328 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
330 bool is_compiled_by_c1() const;
331 bool is_compiled_by_c2() const;
333 // boundaries for different parts
334 address code_begin () const { return _entry_point; }
335 address code_end () const { return header_begin() + _stub_offset ; }
336 address exception_begin () const { return header_begin() + _exception_offset ; }
337 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
338 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
339 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
340 address stub_begin () const { return header_begin() + _stub_offset ; }
341 address stub_end () const { return header_begin() + _consts_offset ; }
342 address consts_begin () const { return header_begin() + _consts_offset ; }
343 address consts_end () const { return header_begin() + _oops_offset ; }
344 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
345 oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; }
347 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
348 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
349 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
350 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
351 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
352 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
353 address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
354 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
355 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
356 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
358 // Sizes
359 int code_size () const { return code_end () - code_begin (); }
360 int stub_size () const { return stub_end () - stub_begin (); }
361 int consts_size () const { return consts_end () - consts_begin (); }
362 int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
363 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
364 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
365 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
366 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
367 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
369 int total_size () const;
371 // Containment
372 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
373 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
374 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
375 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
376 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
377 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
378 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
379 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
381 // entry points
382 address entry_point() const { return _entry_point; } // normal entry point
383 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
385 // flag accessing and manipulation
386 bool is_in_use() const { return _state == alive; }
387 bool is_alive() const { return _state == alive || _state == not_entrant; }
388 bool is_not_entrant() const { return _state == not_entrant; }
389 bool is_zombie() const { return _state == zombie; }
390 bool is_unloaded() const { return _state == unloaded; }
392 // Make the nmethod non entrant. The nmethod will continue to be
393 // alive. It is used when an uncommon trap happens. Returns true
394 // if this thread changed the state of the nmethod or false if
395 // another thread performed the transition.
396 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
397 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
399 // used by jvmti to track if the unload event has been reported
400 bool unload_reported() { return _unload_reported; }
401 void set_unload_reported() { _unload_reported = true; }
403 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; }
404 void mark_for_deoptimization() { _marked_for_deoptimization = true; }
406 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
408 bool has_dependencies() { return dependencies_size() != 0; }
409 void flush_dependencies(BoolObjectClosure* is_alive);
410 bool has_flushed_dependencies() { return _has_flushed_dependencies; }
411 void set_has_flushed_dependencies() {
412 assert(!has_flushed_dependencies(), "should only happen once");
413 _has_flushed_dependencies = 1;
414 }
416 bool is_marked_for_reclamation() const { return _marked_for_reclamation; }
417 void mark_for_reclamation() { _marked_for_reclamation = 1; }
419 bool has_unsafe_access() const { return _has_unsafe_access; }
420 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
422 bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
423 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
425 bool is_speculatively_disconnected() const { return _speculatively_disconnected; }
426 void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; }
428 int comp_level() const { return _comp_level; }
430 // Support for oops in scopes and relocs:
431 // Note: index 0 is reserved for null.
432 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
433 oop* oop_addr_at(int index) const { // for GC
434 // relocation indexes are biased by 1 (because 0 is reserved)
435 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
436 return &oops_begin()[index - 1];
437 }
439 void copy_oops(GrowableArray<jobject>* oops);
441 // Relocation support
442 private:
443 void fix_oop_relocations(address begin, address end, bool initialize_immediates);
444 inline void initialize_immediate_oop(oop* dest, jobject handle);
446 public:
447 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
448 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
450 bool is_at_poll_return(address pc);
451 bool is_at_poll_or_poll_return(address pc);
453 // Non-perm oop support
454 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
455 protected:
456 enum { npl_on_list = 0x01, npl_marked = 0x10 };
457 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
458 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
459 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
460 #ifndef PRODUCT
461 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
462 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
463 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
464 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
465 #endif //PRODUCT
466 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
467 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
469 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
470 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
472 public:
474 // Sweeper support
475 long stack_traversal_mark() { return _stack_traversal_mark; }
476 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
478 // Exception cache support
479 ExceptionCache* exception_cache() const { return _exception_cache; }
480 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
481 address handler_for_exception_and_pc(Handle exception, address pc);
482 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
483 void remove_from_exception_cache(ExceptionCache* ec);
485 // implicit exceptions support
486 address continuation_for_implicit_exception(address pc);
488 // On-stack replacement support
489 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
490 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
491 void invalidate_osr_method();
492 nmethod* osr_link() const { return _osr_link; }
493 void set_osr_link(nmethod *n) { _osr_link = n; }
495 // tells whether frames described by this nmethod can be deoptimized
496 // note: native wrappers cannot be deoptimized.
497 bool can_be_deoptimized() const { return is_java_method(); }
499 // Inline cache support
500 void clear_inline_caches();
501 void cleanup_inline_caches();
502 bool inlinecache_check_contains(address addr) const {
503 return (addr >= instructions_begin() && addr < verified_entry_point());
504 }
506 // unlink and deallocate this nmethod
507 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
508 // expected to use any other private methods/data in this class.
510 protected:
511 void flush();
513 public:
514 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
515 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
516 bool is_locked_by_vm() const { return _lock_count >0; }
518 // See comment at definition of _last_seen_on_stack
519 void mark_as_seen_on_stack();
520 bool can_not_entrant_be_converted();
522 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
523 void set_method(methodOop method) { _method = method; }
525 // GC support
526 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
527 bool unloading_occurred);
528 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
529 oop* root, bool unloading_occurred);
531 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
532 OopClosure* f);
533 void oops_do(OopClosure* f) { oops_do(f, false); }
534 void oops_do(OopClosure* f, bool do_strong_roots_only);
535 bool detect_scavenge_root_oops();
536 void verify_scavenge_root_oops() PRODUCT_RETURN;
538 bool test_set_oops_do_mark();
539 static void oops_do_marking_prologue();
540 static void oops_do_marking_epilogue();
541 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
542 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
544 // ScopeDesc for an instruction
545 ScopeDesc* scope_desc_at(address pc);
547 private:
548 ScopeDesc* scope_desc_in(address begin, address end);
550 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
552 PcDesc* find_pc_desc_internal(address pc, bool approximate);
554 PcDesc* find_pc_desc(address pc, bool approximate) {
555 PcDesc* desc = _pc_desc_cache.last_pc_desc();
556 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
557 return desc;
558 }
559 return find_pc_desc_internal(pc, approximate);
560 }
562 public:
563 // ScopeDesc retrieval operation
564 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
565 // pc_desc_near returns the first PcDesc at or after the givne pc.
566 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
568 public:
569 // copying of debugging information
570 void copy_scopes_pcs(PcDesc* pcs, int count);
571 void copy_scopes_data(address buffer, int size);
573 // Deopt
574 // Return true is the PC is one would expect if the frame is being deopted.
575 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
576 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
577 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
578 // Accessor/mutator for the original pc of a frame before a frame was deopted.
579 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
580 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
582 static address get_deopt_original_pc(const frame* fr);
584 // MethodHandle
585 bool is_method_handle_return(address return_pc);
587 // jvmti support:
588 void post_compiled_method_load_event();
589 jmethodID get_and_cache_jmethod_id();
591 // verify operations
592 void verify();
593 void verify_scopes();
594 void verify_interrupt_point(address interrupt_point);
596 // printing support
597 void print() const;
598 void print_code();
599 void print_relocations() PRODUCT_RETURN;
600 void print_pcs() PRODUCT_RETURN;
601 void print_scopes() PRODUCT_RETURN;
602 void print_dependencies() PRODUCT_RETURN;
603 void print_value_on(outputStream* st) const PRODUCT_RETURN;
604 void print_calls(outputStream* st) PRODUCT_RETURN;
605 void print_handler_table() PRODUCT_RETURN;
606 void print_nul_chk_table() PRODUCT_RETURN;
607 void print_nmethod(bool print_code);
609 void print_on(outputStream* st, const char* title) const;
611 // Logging
612 void log_identity(xmlStream* log) const;
613 void log_new_nmethod() const;
614 void log_state_change() const;
616 // Prints block-level comments, including nmethod specific block labels:
617 virtual void print_block_comment(outputStream* stream, address block_begin) {
618 print_nmethod_labels(stream, block_begin);
619 CodeBlob::print_block_comment(stream, block_begin);
620 }
621 void print_nmethod_labels(outputStream* stream, address block_begin);
623 // Prints a comment for one native instruction (reloc info, pc desc)
624 void print_code_comment_on(outputStream* st, int column, address begin, address end);
625 static void print_statistics() PRODUCT_RETURN;
627 // Compiler task identification. Note that all OSR methods
628 // are numbered in an independent sequence if CICountOSR is true,
629 // and native method wrappers are also numbered independently if
630 // CICountNative is true.
631 int compile_id() const { return _compile_id; }
632 const char* compile_kind() const;
634 // For debugging
635 // CompiledIC* IC_at(char* p) const;
636 // PrimitiveIC* primitiveIC_at(char* p) const;
637 oop embeddedOop_at(address p);
639 // tells if any of this method's dependencies have been invalidated
640 // (this is expensive!)
641 bool check_all_dependencies();
643 // tells if this compiled method is dependent on the given changes,
644 // and the changes have invalidated it
645 bool check_dependency_on(DepChange& changes);
647 // Evolution support. Tells if this compiled method is dependent on any of
648 // methods m() of class dependee, such that if m() in dependee is replaced,
649 // this compiled method will have to be deoptimized.
650 bool is_evol_dependent_on(klassOop dependee);
652 // Fast breakpoint support. Tells if this compiled method is
653 // dependent on the given method. Returns true if this nmethod
654 // corresponds to the given method as well.
655 bool is_dependent_on_method(methodOop dependee);
657 // is it ok to patch at address?
658 bool is_patchable_at(address instr_address);
660 // UseBiasedLocking support
661 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
662 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
663 }
664 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
665 return _compiled_synchronized_native_basic_lock_sp_offset;
666 }
668 // support for code generation
669 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
670 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
671 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
673 };
675 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
676 class nmethodLocker : public StackObj {
677 nmethod* _nm;
679 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
680 static void unlock_nmethod(nmethod* nm); // (ditto)
682 public:
683 nmethodLocker(address pc); // derive nm from pc
684 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
685 nmethodLocker() { _nm = NULL; }
686 ~nmethodLocker() { unlock_nmethod(_nm); }
688 nmethod* code() { return _nm; }
689 void set_code(nmethod* new_nm) {
690 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
691 _nm = new_nm;
692 lock_nmethod(_nm);
693 }
694 };