Wed, 16 Dec 2009 22:15:12 -0800
5057818: codecache full and compiler disabled in bigapps fastdebug run
Reviewed-by: kvn
1 /*
2 * Copyright 1997-2009 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 */
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.
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)
88 unsigned int state:2; // {alive, zombie, unloaded)
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
95 unsigned int has_unsafe_access:1; // May fault due to unsafe access.
97 void clear();
98 };
101 // A nmethod contains:
102 // - header (the nmethod structure)
103 // [Relocation]
104 // - relocation information
105 // - constant part (doubles, longs and floats used in nmethod)
106 // [Code]
107 // - code body
108 // - exception handler
109 // - stub code
110 // [Debugging information]
111 // - oop array
112 // - data array
113 // - pcs
114 // [Exception handler table]
115 // - handler entry point array
116 // [Implicit Null Pointer exception table]
117 // - implicit null table array
119 class Dependencies;
120 class ExceptionHandlerTable;
121 class ImplicitExceptionTable;
122 class AbstractCompiler;
123 class xmlStream;
125 class nmethod : public CodeBlob {
126 friend class VMStructs;
127 friend class NMethodSweeper;
128 friend class CodeCache; // non-perm oops
129 private:
130 // Shared fields for all nmethod's
131 static int _zombie_instruction_size;
133 methodOop _method;
134 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
136 // To support simple linked-list chaining of nmethods:
137 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
138 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
140 static nmethod* volatile _oops_do_mark_nmethods;
141 nmethod* volatile _oops_do_mark_link;
143 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
145 // Offsets for different nmethod parts
146 int _exception_offset;
147 // All deoptee's will resume execution at this location described by this offset
148 int _deoptimize_offset;
149 #ifdef HAVE_DTRACE_H
150 int _trap_offset;
151 #endif // def HAVE_DTRACE_H
152 int _stub_offset;
153 int _consts_offset;
154 int _scopes_data_offset;
155 int _scopes_pcs_offset;
156 int _dependencies_offset;
157 int _handler_table_offset;
158 int _nul_chk_table_offset;
159 int _nmethod_end_offset;
161 // location in frame (offset for sp) that deopt can store the original
162 // pc during a deopt.
163 int _orig_pc_offset;
165 int _compile_id; // which compilation made this nmethod
166 int _comp_level; // compilation level
168 // offsets for entry points
169 address _entry_point; // entry point with class check
170 address _verified_entry_point; // entry point without class check
171 address _osr_entry_point; // entry point for on stack replacement
173 nmFlags flags; // various flags to keep track of nmethod state
174 bool _markedForDeoptimization; // Used for stack deoptimization
175 enum { alive = 0,
176 not_entrant = 1, // uncommon trap has happened but activations may still exist
177 zombie = 2,
178 unloaded = 3 };
180 // used by jvmti to track if an unload event has been posted for this nmethod.
181 bool _unload_reported;
183 jbyte _scavenge_root_state;
185 NOT_PRODUCT(bool _has_debug_info; )
187 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
188 jint _lock_count;
190 // not_entrant method removal. Each mark_sweep pass will update
191 // this mark to current sweep invocation count if it is seen on the
192 // stack. An not_entrant method can be removed when there is no
193 // more activations, i.e., when the _stack_traversal_mark is less than
194 // current sweep traversal index.
195 long _stack_traversal_mark;
197 ExceptionCache *_exception_cache;
198 PcDescCache _pc_desc_cache;
200 // These are only used for compiled synchronized native methods to
201 // locate the owner and stack slot for the BasicLock so that we can
202 // properly revoke the bias of the owner if necessary. They are
203 // needed because there is no debug information for compiled native
204 // wrappers and the oop maps are insufficient to allow
205 // frame::retrieve_receiver() to work. Currently they are expected
206 // to be byte offsets from the Java stack pointer for maximum code
207 // sharing between platforms. Note that currently biased locking
208 // will never cause Class instances to be biased but this code
209 // handles the static synchronized case as well.
210 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
211 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
213 friend class nmethodLocker;
215 // For native wrappers
216 nmethod(methodOop method,
217 int nmethod_size,
218 CodeOffsets* offsets,
219 CodeBuffer *code_buffer,
220 int frame_size,
221 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
222 ByteSize basic_lock_sp_offset, /* synchronized natives only */
223 OopMapSet* oop_maps);
225 #ifdef HAVE_DTRACE_H
226 // For native wrappers
227 nmethod(methodOop method,
228 int nmethod_size,
229 CodeOffsets* offsets,
230 CodeBuffer *code_buffer,
231 int frame_size);
232 #endif // def HAVE_DTRACE_H
234 // Creation support
235 nmethod(methodOop method,
236 int nmethod_size,
237 int compile_id,
238 int entry_bci,
239 CodeOffsets* offsets,
240 int orig_pc_offset,
241 DebugInformationRecorder *recorder,
242 Dependencies* dependencies,
243 CodeBuffer *code_buffer,
244 int frame_size,
245 OopMapSet* oop_maps,
246 ExceptionHandlerTable* handler_table,
247 ImplicitExceptionTable* nul_chk_table,
248 AbstractCompiler* compiler,
249 int comp_level);
251 // helper methods
252 void* operator new(size_t size, int nmethod_size);
254 const char* reloc_string_for(u_char* begin, u_char* end);
255 // Returns true if this thread changed the state of the nmethod or
256 // false if another thread performed the transition.
257 bool make_not_entrant_or_zombie(int state);
258 void inc_decompile_count();
260 // used to check that writes to nmFlags are done consistently.
261 static void check_safepoint() PRODUCT_RETURN;
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 inline void post_compiled_method_unload();
270 public:
271 // create nmethod with entry_bci
272 static nmethod* new_nmethod(methodHandle method,
273 int compile_id,
274 int entry_bci,
275 CodeOffsets* offsets,
276 int orig_pc_offset,
277 DebugInformationRecorder* recorder,
278 Dependencies* dependencies,
279 CodeBuffer *code_buffer,
280 int frame_size,
281 OopMapSet* oop_maps,
282 ExceptionHandlerTable* handler_table,
283 ImplicitExceptionTable* nul_chk_table,
284 AbstractCompiler* compiler,
285 int comp_level);
287 static nmethod* new_native_nmethod(methodHandle method,
288 CodeBuffer *code_buffer,
289 int vep_offset,
290 int frame_complete,
291 int frame_size,
292 ByteSize receiver_sp_offset,
293 ByteSize basic_lock_sp_offset,
294 OopMapSet* oop_maps);
296 #ifdef HAVE_DTRACE_H
297 // The method we generate for a dtrace probe has to look
298 // like an nmethod as far as the rest of the system is concerned
299 // which is somewhat unfortunate.
300 static nmethod* new_dtrace_nmethod(methodHandle method,
301 CodeBuffer *code_buffer,
302 int vep_offset,
303 int trap_offset,
304 int frame_complete,
305 int frame_size);
307 int trap_offset() const { return _trap_offset; }
308 address trap_address() const { return code_begin() + _trap_offset; }
310 #endif // def HAVE_DTRACE_H
312 // accessors
313 methodOop method() const { return _method; }
314 AbstractCompiler* compiler() const { return _compiler; }
316 #ifndef PRODUCT
317 bool has_debug_info() const { return _has_debug_info; }
318 void set_has_debug_info(bool f) { _has_debug_info = false; }
319 #endif // NOT PRODUCT
321 // type info
322 bool is_nmethod() const { return true; }
323 bool is_java_method() const { return !method()->is_native(); }
324 bool is_native_method() const { return method()->is_native(); }
325 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
327 bool is_compiled_by_c1() const;
328 bool is_compiled_by_c2() const;
330 // boundaries for different parts
331 address code_begin () const { return _entry_point; }
332 address code_end () const { return header_begin() + _stub_offset ; }
333 address exception_begin () const { return header_begin() + _exception_offset ; }
334 address deopt_handler_begin() const { return header_begin() + _deoptimize_offset ; }
335 address stub_begin () const { return header_begin() + _stub_offset ; }
336 address stub_end () const { return header_begin() + _consts_offset ; }
337 address consts_begin () const { return header_begin() + _consts_offset ; }
338 address consts_end () const { return header_begin() + _scopes_data_offset ; }
339 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
340 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
341 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
342 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset); }
343 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
344 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
345 address handler_table_begin() const { return header_begin() + _handler_table_offset ; }
346 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
347 address nul_chk_table_begin() const { return header_begin() + _nul_chk_table_offset ; }
348 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
350 int code_size () const { return code_end () - code_begin (); }
351 int stub_size () const { return stub_end () - stub_begin (); }
352 int consts_size () const { return consts_end () - consts_begin (); }
353 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
354 int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); }
355 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
356 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
357 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
359 int total_size () const;
361 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
362 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
363 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
364 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
365 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
366 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
367 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
369 // entry points
370 address entry_point() const { return _entry_point; } // normal entry point
371 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
373 // flag accessing and manipulation
374 bool is_in_use() const { return flags.state == alive; }
375 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
376 bool is_not_entrant() const { return flags.state == not_entrant; }
377 bool is_zombie() const { return flags.state == zombie; }
378 bool is_unloaded() const { return flags.state == unloaded; }
380 // Make the nmethod non entrant. The nmethod will continue to be
381 // alive. It is used when an uncommon trap happens. Returns true
382 // if this thread changed the state of the nmethod or false if
383 // another thread performed the transition.
384 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
385 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
387 // used by jvmti to track if the unload event has been reported
388 bool unload_reported() { return _unload_reported; }
389 void set_unload_reported() { _unload_reported = true; }
391 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; }
392 void mark_for_deoptimization() { _markedForDeoptimization = true; }
394 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
396 bool has_dependencies() { return dependencies_size() != 0; }
397 void flush_dependencies(BoolObjectClosure* is_alive);
398 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; }
399 void set_has_flushed_dependencies() {
400 check_safepoint();
401 assert(!has_flushed_dependencies(), "should only happen once");
402 flags.hasFlushedDependencies = 1;
403 }
405 bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
406 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; }
407 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; }
409 bool has_unsafe_access() const { return flags.has_unsafe_access; }
410 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
412 int level() const { return flags.level; }
413 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; }
415 int comp_level() const { return _comp_level; }
417 int version() const { return flags.version; }
418 void set_version(int v);
420 // Non-perm oop support
421 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
422 protected:
423 enum { npl_on_list = 0x01, npl_marked = 0x10 };
424 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
425 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
426 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
427 #ifndef PRODUCT
428 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
429 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
430 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
431 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
432 #endif //PRODUCT
433 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
434 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
436 public:
438 // Sweeper support
439 long stack_traversal_mark() { return _stack_traversal_mark; }
440 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
442 // Exception cache support
443 ExceptionCache* exception_cache() const { return _exception_cache; }
444 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
445 address handler_for_exception_and_pc(Handle exception, address pc);
446 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
447 void remove_from_exception_cache(ExceptionCache* ec);
449 // implicit exceptions support
450 address continuation_for_implicit_exception(address pc);
452 // On-stack replacement support
453 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
454 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
455 void invalidate_osr_method();
456 nmethod* osr_link() const { return _osr_link; }
457 void set_osr_link(nmethod *n) { _osr_link = n; }
459 // tells whether frames described by this nmethod can be deoptimized
460 // note: native wrappers cannot be deoptimized.
461 bool can_be_deoptimized() const { return is_java_method(); }
463 // Inline cache support
464 void clear_inline_caches();
465 void cleanup_inline_caches();
466 bool inlinecache_check_contains(address addr) const {
467 return (addr >= instructions_begin() && addr < verified_entry_point());
468 }
470 // unlink and deallocate this nmethod
471 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
472 // expected to use any other private methods/data in this class.
474 protected:
475 void flush();
477 public:
478 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
479 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
480 bool is_locked_by_vm() const { return _lock_count >0; }
482 // See comment at definition of _last_seen_on_stack
483 void mark_as_seen_on_stack();
484 bool can_not_entrant_be_converted();
486 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
487 void set_method(methodOop method) { _method = method; }
489 // GC support
490 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
491 bool unloading_occurred);
492 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
493 oop* root, bool unloading_occurred);
495 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
496 OopClosure* f);
497 virtual void oops_do(OopClosure* f) { oops_do(f, false); }
498 void oops_do(OopClosure* f, bool do_strong_roots_only);
499 bool detect_scavenge_root_oops();
500 void verify_scavenge_root_oops() PRODUCT_RETURN;
502 bool test_set_oops_do_mark();
503 static void oops_do_marking_prologue();
504 static void oops_do_marking_epilogue();
505 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
506 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
508 // ScopeDesc for an instruction
509 ScopeDesc* scope_desc_at(address pc);
511 private:
512 ScopeDesc* scope_desc_in(address begin, address end);
514 address* orig_pc_addr(const frame* fr ) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
516 PcDesc* find_pc_desc_internal(address pc, bool approximate);
518 PcDesc* find_pc_desc(address pc, bool approximate) {
519 PcDesc* desc = _pc_desc_cache.last_pc_desc();
520 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
521 return desc;
522 }
523 return find_pc_desc_internal(pc, approximate);
524 }
526 public:
527 // ScopeDesc retrieval operation
528 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
529 // pc_desc_near returns the first PcDesc at or after the givne pc.
530 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
532 public:
533 // copying of debugging information
534 void copy_scopes_pcs(PcDesc* pcs, int count);
535 void copy_scopes_data(address buffer, int size);
537 // deopt
538 // return true is the pc is one would expect if the frame is being deopted.
539 bool is_deopt_pc(address pc);
540 // Accessor/mutator for the original pc of a frame before a frame was deopted.
541 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
542 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
544 // jvmti support:
545 void post_compiled_method_load_event();
547 // verify operations
548 void verify();
549 void verify_scopes();
550 void verify_interrupt_point(address interrupt_point);
552 // printing support
553 void print() const;
554 void print_code();
555 void print_relocations() PRODUCT_RETURN;
556 void print_pcs() PRODUCT_RETURN;
557 void print_scopes() PRODUCT_RETURN;
558 void print_dependencies() PRODUCT_RETURN;
559 void print_value_on(outputStream* st) const PRODUCT_RETURN;
560 void print_calls(outputStream* st) PRODUCT_RETURN;
561 void print_handler_table() PRODUCT_RETURN;
562 void print_nul_chk_table() PRODUCT_RETURN;
563 void print_nmethod(bool print_code);
565 void print_on(outputStream* st, const char* title) const;
567 // Logging
568 void log_identity(xmlStream* log) const;
569 void log_new_nmethod() const;
570 void log_state_change() const;
572 // Prints a comment for one native instruction (reloc info, pc desc)
573 void print_code_comment_on(outputStream* st, int column, address begin, address end);
574 static void print_statistics() PRODUCT_RETURN;
576 // Compiler task identification. Note that all OSR methods
577 // are numbered in an independent sequence if CICountOSR is true,
578 // and native method wrappers are also numbered independently if
579 // CICountNative is true.
580 int compile_id() const { return _compile_id; }
581 const char* compile_kind() const;
583 // For debugging
584 // CompiledIC* IC_at(char* p) const;
585 // PrimitiveIC* primitiveIC_at(char* p) const;
586 oop embeddedOop_at(address p);
588 // tells if any of this method's dependencies have been invalidated
589 // (this is expensive!)
590 bool check_all_dependencies();
592 // tells if this compiled method is dependent on the given changes,
593 // and the changes have invalidated it
594 bool check_dependency_on(DepChange& changes);
596 // Evolution support. Tells if this compiled method is dependent on any of
597 // methods m() of class dependee, such that if m() in dependee is replaced,
598 // this compiled method will have to be deoptimized.
599 bool is_evol_dependent_on(klassOop dependee);
601 // Fast breakpoint support. Tells if this compiled method is
602 // dependent on the given method. Returns true if this nmethod
603 // corresponds to the given method as well.
604 bool is_dependent_on_method(methodOop dependee);
606 // is it ok to patch at address?
607 bool is_patchable_at(address instr_address);
609 // UseBiasedLocking support
610 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
611 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
612 }
613 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
614 return _compiled_synchronized_native_basic_lock_sp_offset;
615 }
617 // support for code generation
618 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
619 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
620 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
622 };
624 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
625 class nmethodLocker : public StackObj {
626 nmethod* _nm;
628 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
629 static void unlock_nmethod(nmethod* nm); // (ditto)
631 public:
632 nmethodLocker(address pc); // derive nm from pc
633 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
634 nmethodLocker() { _nm = NULL; }
635 ~nmethodLocker() { unlock_nmethod(_nm); }
637 nmethod* code() { return _nm; }
638 void set_code(nmethod* new_nm) {
639 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
640 _nm = new_nm;
641 lock_nmethod(_nm);
642 }
643 };