Fri, 29 Jan 2010 09:27:22 -0800
4360113: Evict nmethods when code cache gets full
Summary: Speculatively unload the oldest nmethods when code cache gets full.
Reviewed-by: never, kvn
Contributed-by: eric.caspole@amd.com
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.
96 unsigned int has_method_handle_invokes:1; // Has this method MethodHandle invokes?
98 unsigned int speculatively_disconnected:1; // Marked for potential unload
100 void clear();
101 };
104 // A nmethod contains:
105 // - header (the nmethod structure)
106 // [Relocation]
107 // - relocation information
108 // - constant part (doubles, longs and floats used in nmethod)
109 // [Code]
110 // - code body
111 // - exception handler
112 // - stub code
113 // [Debugging information]
114 // - oop array
115 // - data array
116 // - pcs
117 // [Exception handler table]
118 // - handler entry point array
119 // [Implicit Null Pointer exception table]
120 // - implicit null table array
122 class Dependencies;
123 class ExceptionHandlerTable;
124 class ImplicitExceptionTable;
125 class AbstractCompiler;
126 class xmlStream;
128 class nmethod : public CodeBlob {
129 friend class VMStructs;
130 friend class NMethodSweeper;
131 friend class CodeCache; // non-perm oops
132 private:
133 // Shared fields for all nmethod's
134 static int _zombie_instruction_size;
136 methodOop _method;
137 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
139 // To support simple linked-list chaining of nmethods:
140 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
141 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
142 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
144 static nmethod* volatile _oops_do_mark_nmethods;
145 nmethod* volatile _oops_do_mark_link;
147 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
149 // Offsets for different nmethod parts
150 int _exception_offset;
151 // All deoptee's will resume execution at this location described by this offset
152 int _deoptimize_offset;
153 #ifdef HAVE_DTRACE_H
154 int _trap_offset;
155 #endif // def HAVE_DTRACE_H
156 int _stub_offset;
157 int _consts_offset;
158 int _scopes_data_offset;
159 int _scopes_pcs_offset;
160 int _dependencies_offset;
161 int _handler_table_offset;
162 int _nul_chk_table_offset;
163 int _nmethod_end_offset;
165 // location in frame (offset for sp) that deopt can store the original
166 // pc during a deopt.
167 int _orig_pc_offset;
169 int _compile_id; // which compilation made this nmethod
170 int _comp_level; // compilation level
172 // offsets for entry points
173 address _entry_point; // entry point with class check
174 address _verified_entry_point; // entry point without class check
175 address _osr_entry_point; // entry point for on stack replacement
177 nmFlags flags; // various flags to keep track of nmethod state
178 bool _markedForDeoptimization; // Used for stack deoptimization
179 enum { alive = 0,
180 not_entrant = 1, // uncommon trap has happened but activations may still exist
181 zombie = 2,
182 unloaded = 3 };
184 // used by jvmti to track if an unload event has been posted for this nmethod.
185 bool _unload_reported;
187 jbyte _scavenge_root_state;
189 NOT_PRODUCT(bool _has_debug_info; )
191 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
192 jint _lock_count;
194 // not_entrant method removal. Each mark_sweep pass will update
195 // this mark to current sweep invocation count if it is seen on the
196 // stack. An not_entrant method can be removed when there is no
197 // more activations, i.e., when the _stack_traversal_mark is less than
198 // current sweep traversal index.
199 long _stack_traversal_mark;
201 ExceptionCache *_exception_cache;
202 PcDescCache _pc_desc_cache;
204 // These are only used for compiled synchronized native methods to
205 // locate the owner and stack slot for the BasicLock so that we can
206 // properly revoke the bias of the owner if necessary. They are
207 // needed because there is no debug information for compiled native
208 // wrappers and the oop maps are insufficient to allow
209 // frame::retrieve_receiver() to work. Currently they are expected
210 // to be byte offsets from the Java stack pointer for maximum code
211 // sharing between platforms. Note that currently biased locking
212 // will never cause Class instances to be biased but this code
213 // handles the static synchronized case as well.
214 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
215 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
217 friend class nmethodLocker;
219 // For native wrappers
220 nmethod(methodOop method,
221 int nmethod_size,
222 CodeOffsets* offsets,
223 CodeBuffer *code_buffer,
224 int frame_size,
225 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
226 ByteSize basic_lock_sp_offset, /* synchronized natives only */
227 OopMapSet* oop_maps);
229 #ifdef HAVE_DTRACE_H
230 // For native wrappers
231 nmethod(methodOop method,
232 int nmethod_size,
233 CodeOffsets* offsets,
234 CodeBuffer *code_buffer,
235 int frame_size);
236 #endif // def HAVE_DTRACE_H
238 // Creation support
239 nmethod(methodOop method,
240 int nmethod_size,
241 int compile_id,
242 int entry_bci,
243 CodeOffsets* offsets,
244 int orig_pc_offset,
245 DebugInformationRecorder *recorder,
246 Dependencies* dependencies,
247 CodeBuffer *code_buffer,
248 int frame_size,
249 OopMapSet* oop_maps,
250 ExceptionHandlerTable* handler_table,
251 ImplicitExceptionTable* nul_chk_table,
252 AbstractCompiler* compiler,
253 int comp_level);
255 // helper methods
256 void* operator new(size_t size, int nmethod_size);
258 const char* reloc_string_for(u_char* begin, u_char* end);
259 // Returns true if this thread changed the state of the nmethod or
260 // false if another thread performed the transition.
261 bool make_not_entrant_or_zombie(unsigned int state);
262 void inc_decompile_count();
264 // used to check that writes to nmFlags are done consistently.
265 static void check_safepoint() PRODUCT_RETURN;
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);
271 // Inform external interfaces that a compiled method has been unloaded
272 inline void post_compiled_method_unload();
274 public:
275 // create nmethod with entry_bci
276 static nmethod* new_nmethod(methodHandle method,
277 int compile_id,
278 int entry_bci,
279 CodeOffsets* offsets,
280 int orig_pc_offset,
281 DebugInformationRecorder* recorder,
282 Dependencies* dependencies,
283 CodeBuffer *code_buffer,
284 int frame_size,
285 OopMapSet* oop_maps,
286 ExceptionHandlerTable* handler_table,
287 ImplicitExceptionTable* nul_chk_table,
288 AbstractCompiler* compiler,
289 int comp_level);
291 static nmethod* new_native_nmethod(methodHandle method,
292 CodeBuffer *code_buffer,
293 int vep_offset,
294 int frame_complete,
295 int frame_size,
296 ByteSize receiver_sp_offset,
297 ByteSize basic_lock_sp_offset,
298 OopMapSet* oop_maps);
300 #ifdef HAVE_DTRACE_H
301 // The method we generate for a dtrace probe has to look
302 // like an nmethod as far as the rest of the system is concerned
303 // which is somewhat unfortunate.
304 static nmethod* new_dtrace_nmethod(methodHandle method,
305 CodeBuffer *code_buffer,
306 int vep_offset,
307 int trap_offset,
308 int frame_complete,
309 int frame_size);
311 int trap_offset() const { return _trap_offset; }
312 address trap_address() const { return code_begin() + _trap_offset; }
314 #endif // def HAVE_DTRACE_H
316 // accessors
317 methodOop method() const { return _method; }
318 AbstractCompiler* compiler() const { return _compiler; }
320 #ifndef PRODUCT
321 bool has_debug_info() const { return _has_debug_info; }
322 void set_has_debug_info(bool f) { _has_debug_info = false; }
323 #endif // NOT PRODUCT
325 // type info
326 bool is_nmethod() const { return true; }
327 bool is_java_method() const { return !method()->is_native(); }
328 bool is_native_method() const { return method()->is_native(); }
329 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
331 bool is_compiled_by_c1() const;
332 bool is_compiled_by_c2() const;
334 // boundaries for different parts
335 address code_begin () const { return _entry_point; }
336 address code_end () const { return header_begin() + _stub_offset ; }
337 address exception_begin () const { return header_begin() + _exception_offset ; }
338 address deopt_handler_begin() const { return header_begin() + _deoptimize_offset ; }
339 address stub_begin () const { return header_begin() + _stub_offset ; }
340 address stub_end () const { return header_begin() + _consts_offset ; }
341 address consts_begin () const { return header_begin() + _consts_offset ; }
342 address consts_end () const { return header_begin() + _scopes_data_offset ; }
343 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
344 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
345 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
346 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset); }
347 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
348 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
349 address handler_table_begin() const { return header_begin() + _handler_table_offset ; }
350 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
351 address nul_chk_table_begin() const { return header_begin() + _nul_chk_table_offset ; }
352 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
354 int code_size () const { return code_end () - code_begin (); }
355 int stub_size () const { return stub_end () - stub_begin (); }
356 int consts_size () const { return consts_end () - consts_begin (); }
357 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
358 int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); }
359 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
360 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
361 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
363 int total_size () const;
365 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
366 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
367 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
368 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
369 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
370 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
371 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
373 // entry points
374 address entry_point() const { return _entry_point; } // normal entry point
375 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
377 // flag accessing and manipulation
378 bool is_in_use() const { return flags.state == alive; }
379 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
380 bool is_not_entrant() const { return flags.state == not_entrant; }
381 bool is_zombie() const { return flags.state == zombie; }
382 bool is_unloaded() const { return flags.state == unloaded; }
384 // Make the nmethod non entrant. The nmethod will continue to be
385 // alive. It is used when an uncommon trap happens. Returns true
386 // if this thread changed the state of the nmethod or false if
387 // another thread performed the transition.
388 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
389 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
391 // used by jvmti to track if the unload event has been reported
392 bool unload_reported() { return _unload_reported; }
393 void set_unload_reported() { _unload_reported = true; }
395 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; }
396 void mark_for_deoptimization() { _markedForDeoptimization = true; }
398 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
400 bool has_dependencies() { return dependencies_size() != 0; }
401 void flush_dependencies(BoolObjectClosure* is_alive);
402 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; }
403 void set_has_flushed_dependencies() {
404 check_safepoint();
405 assert(!has_flushed_dependencies(), "should only happen once");
406 flags.hasFlushedDependencies = 1;
407 }
409 bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
410 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; }
411 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; }
413 bool has_unsafe_access() const { return flags.has_unsafe_access; }
414 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
416 bool has_method_handle_invokes() const { return flags.has_method_handle_invokes; }
417 void set_has_method_handle_invokes(bool z) { flags.has_method_handle_invokes = z; }
419 bool is_speculatively_disconnected() const { return flags.speculatively_disconnected; }
420 void set_speculatively_disconnected(bool z) { flags.speculatively_disconnected = z; }
422 int level() const { return flags.level; }
423 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; }
425 int comp_level() const { return _comp_level; }
427 int version() const { return flags.version; }
428 void set_version(int v);
430 // Non-perm oop support
431 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
432 protected:
433 enum { npl_on_list = 0x01, npl_marked = 0x10 };
434 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
435 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
436 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
437 #ifndef PRODUCT
438 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
439 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
440 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
441 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
442 #endif //PRODUCT
443 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
444 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
446 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
447 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
449 public:
451 // Sweeper support
452 long stack_traversal_mark() { return _stack_traversal_mark; }
453 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
455 // Exception cache support
456 ExceptionCache* exception_cache() const { return _exception_cache; }
457 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
458 address handler_for_exception_and_pc(Handle exception, address pc);
459 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
460 void remove_from_exception_cache(ExceptionCache* ec);
462 // implicit exceptions support
463 address continuation_for_implicit_exception(address pc);
465 // On-stack replacement support
466 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
467 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
468 void invalidate_osr_method();
469 nmethod* osr_link() const { return _osr_link; }
470 void set_osr_link(nmethod *n) { _osr_link = n; }
472 // tells whether frames described by this nmethod can be deoptimized
473 // note: native wrappers cannot be deoptimized.
474 bool can_be_deoptimized() const { return is_java_method(); }
476 // Inline cache support
477 void clear_inline_caches();
478 void cleanup_inline_caches();
479 bool inlinecache_check_contains(address addr) const {
480 return (addr >= instructions_begin() && addr < verified_entry_point());
481 }
483 // unlink and deallocate this nmethod
484 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
485 // expected to use any other private methods/data in this class.
487 protected:
488 void flush();
490 public:
491 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
492 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
493 bool is_locked_by_vm() const { return _lock_count >0; }
495 // See comment at definition of _last_seen_on_stack
496 void mark_as_seen_on_stack();
497 bool can_not_entrant_be_converted();
499 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
500 void set_method(methodOop method) { _method = method; }
502 // GC support
503 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
504 bool unloading_occurred);
505 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
506 oop* root, bool unloading_occurred);
508 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
509 OopClosure* f);
510 virtual void oops_do(OopClosure* f) { oops_do(f, false); }
511 void oops_do(OopClosure* f, bool do_strong_roots_only);
512 bool detect_scavenge_root_oops();
513 void verify_scavenge_root_oops() PRODUCT_RETURN;
515 bool test_set_oops_do_mark();
516 static void oops_do_marking_prologue();
517 static void oops_do_marking_epilogue();
518 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
519 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
521 // ScopeDesc for an instruction
522 ScopeDesc* scope_desc_at(address pc);
524 private:
525 ScopeDesc* scope_desc_in(address begin, address end);
527 address* orig_pc_addr(const frame* fr ) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
529 PcDesc* find_pc_desc_internal(address pc, bool approximate);
531 PcDesc* find_pc_desc(address pc, bool approximate) {
532 PcDesc* desc = _pc_desc_cache.last_pc_desc();
533 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
534 return desc;
535 }
536 return find_pc_desc_internal(pc, approximate);
537 }
539 public:
540 // ScopeDesc retrieval operation
541 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
542 // pc_desc_near returns the first PcDesc at or after the givne pc.
543 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
545 public:
546 // copying of debugging information
547 void copy_scopes_pcs(PcDesc* pcs, int count);
548 void copy_scopes_data(address buffer, int size);
550 // deopt
551 // return true is the pc is one would expect if the frame is being deopted.
552 bool is_deopt_pc(address pc);
553 // Accessor/mutator for the original pc of a frame before a frame was deopted.
554 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
555 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
557 // MethodHandle
558 bool is_method_handle_return(address return_pc);
560 // jvmti support:
561 void post_compiled_method_load_event();
563 // verify operations
564 void verify();
565 void verify_scopes();
566 void verify_interrupt_point(address interrupt_point);
568 // printing support
569 void print() const;
570 void print_code();
571 void print_relocations() PRODUCT_RETURN;
572 void print_pcs() PRODUCT_RETURN;
573 void print_scopes() PRODUCT_RETURN;
574 void print_dependencies() PRODUCT_RETURN;
575 void print_value_on(outputStream* st) const PRODUCT_RETURN;
576 void print_calls(outputStream* st) PRODUCT_RETURN;
577 void print_handler_table() PRODUCT_RETURN;
578 void print_nul_chk_table() PRODUCT_RETURN;
579 void print_nmethod(bool print_code);
581 void print_on(outputStream* st, const char* title) const;
583 // Logging
584 void log_identity(xmlStream* log) const;
585 void log_new_nmethod() const;
586 void log_state_change() const;
588 // Prints block-level comments, including nmethod specific block labels:
589 virtual void print_block_comment(outputStream* stream, address block_begin) {
590 print_nmethod_labels(stream, block_begin);
591 CodeBlob::print_block_comment(stream, block_begin);
592 }
593 void print_nmethod_labels(outputStream* stream, address block_begin);
595 // Prints a comment for one native instruction (reloc info, pc desc)
596 void print_code_comment_on(outputStream* st, int column, address begin, address end);
597 static void print_statistics() PRODUCT_RETURN;
599 // Compiler task identification. Note that all OSR methods
600 // are numbered in an independent sequence if CICountOSR is true,
601 // and native method wrappers are also numbered independently if
602 // CICountNative is true.
603 int compile_id() const { return _compile_id; }
604 const char* compile_kind() const;
606 // For debugging
607 // CompiledIC* IC_at(char* p) const;
608 // PrimitiveIC* primitiveIC_at(char* p) const;
609 oop embeddedOop_at(address p);
611 // tells if any of this method's dependencies have been invalidated
612 // (this is expensive!)
613 bool check_all_dependencies();
615 // tells if this compiled method is dependent on the given changes,
616 // and the changes have invalidated it
617 bool check_dependency_on(DepChange& changes);
619 // Evolution support. Tells if this compiled method is dependent on any of
620 // methods m() of class dependee, such that if m() in dependee is replaced,
621 // this compiled method will have to be deoptimized.
622 bool is_evol_dependent_on(klassOop dependee);
624 // Fast breakpoint support. Tells if this compiled method is
625 // dependent on the given method. Returns true if this nmethod
626 // corresponds to the given method as well.
627 bool is_dependent_on_method(methodOop dependee);
629 // is it ok to patch at address?
630 bool is_patchable_at(address instr_address);
632 // UseBiasedLocking support
633 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
634 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
635 }
636 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
637 return _compiled_synchronized_native_basic_lock_sp_offset;
638 }
640 // support for code generation
641 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
642 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
643 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
645 };
647 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
648 class nmethodLocker : public StackObj {
649 nmethod* _nm;
651 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
652 static void unlock_nmethod(nmethod* nm); // (ditto)
654 public:
655 nmethodLocker(address pc); // derive nm from pc
656 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
657 nmethodLocker() { _nm = NULL; }
658 ~nmethodLocker() { unlock_nmethod(_nm); }
660 nmethod* code() { return _nm; }
661 void set_code(nmethod* new_nm) {
662 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
663 _nm = new_nm;
664 lock_nmethod(_nm);
665 }
666 };