Mon, 17 May 2010 16:50:07 -0700
6950075: nmethod sweeper should operate concurrently
Reviewed-by: never, kvn
Contributed-by: eric.caspole@amd.com
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 */
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 age:4; // age (in # of sweep steps)
87 unsigned int state:2; // {alive, zombie, unloaded)
89 unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap?
90 unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures
91 unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies
92 unsigned int markedForReclamation:1; // Used by NMethodSweeper
94 unsigned int has_unsafe_access:1; // May fault due to unsafe access.
95 unsigned int has_method_handle_invokes:1; // Has this method MethodHandle invokes?
97 unsigned int speculatively_disconnected:1; // Marked for potential unload
99 void clear();
100 };
103 // A nmethod contains:
104 // - header (the nmethod structure)
105 // [Relocation]
106 // - relocation information
107 // - constant part (doubles, longs and floats used in nmethod)
108 // [Code]
109 // - code body
110 // - exception handler
111 // - stub code
112 // [Debugging information]
113 // - oop array
114 // - data array
115 // - pcs
116 // [Exception handler table]
117 // - handler entry point array
118 // [Implicit Null Pointer exception table]
119 // - implicit null table array
121 class Dependencies;
122 class ExceptionHandlerTable;
123 class ImplicitExceptionTable;
124 class AbstractCompiler;
125 class xmlStream;
127 class nmethod : public CodeBlob {
128 friend class VMStructs;
129 friend class NMethodSweeper;
130 friend class CodeCache; // non-perm oops
131 private:
132 // Shared fields for all nmethod's
133 static int _zombie_instruction_size;
135 methodOop _method;
136 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
138 // To support simple linked-list chaining of nmethods:
139 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
140 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
141 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
143 static nmethod* volatile _oops_do_mark_nmethods;
144 nmethod* volatile _oops_do_mark_link;
146 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
148 // Offsets for different nmethod parts
149 int _exception_offset;
150 // All deoptee's will resume execution at this location described by
151 // this offset.
152 int _deoptimize_offset;
153 // All deoptee's at a MethodHandle call site will resume execution
154 // at this location described by this offset.
155 int _deoptimize_mh_offset;
156 // Offset of the unwind handler if it exists
157 int _unwind_handler_offset;
159 #ifdef HAVE_DTRACE_H
160 int _trap_offset;
161 #endif // def HAVE_DTRACE_H
162 int _stub_offset;
163 int _consts_offset;
164 int _scopes_data_offset;
165 int _scopes_pcs_offset;
166 int _dependencies_offset;
167 int _handler_table_offset;
168 int _nul_chk_table_offset;
169 int _nmethod_end_offset;
171 // location in frame (offset for sp) that deopt can store the original
172 // pc during a deopt.
173 int _orig_pc_offset;
175 int _compile_id; // which compilation made this nmethod
176 int _comp_level; // compilation level
178 // offsets for entry points
179 address _entry_point; // entry point with class check
180 address _verified_entry_point; // entry point without class check
181 address _osr_entry_point; // entry point for on stack replacement
183 nmFlags flags; // various flags to keep track of nmethod state
184 bool _markedForDeoptimization; // Used for stack deoptimization
185 enum { alive = 0,
186 not_entrant = 1, // uncommon trap has happened but activations may still exist
187 zombie = 2,
188 unloaded = 3 };
190 // used by jvmti to track if an unload event has been posted for this nmethod.
191 bool _unload_reported;
193 jbyte _scavenge_root_state;
195 NOT_PRODUCT(bool _has_debug_info; )
197 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
198 jint _lock_count;
200 // not_entrant method removal. Each mark_sweep pass will update
201 // this mark to current sweep invocation count if it is seen on the
202 // stack. An not_entrant method can be removed when there is no
203 // more activations, i.e., when the _stack_traversal_mark is less than
204 // current sweep traversal index.
205 long _stack_traversal_mark;
207 ExceptionCache *_exception_cache;
208 PcDescCache _pc_desc_cache;
210 // These are only used for compiled synchronized native methods to
211 // locate the owner and stack slot for the BasicLock so that we can
212 // properly revoke the bias of the owner if necessary. They are
213 // needed because there is no debug information for compiled native
214 // wrappers and the oop maps are insufficient to allow
215 // frame::retrieve_receiver() to work. Currently they are expected
216 // to be byte offsets from the Java stack pointer for maximum code
217 // sharing between platforms. Note that currently biased locking
218 // will never cause Class instances to be biased but this code
219 // handles the static synchronized case as well.
220 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
221 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
223 friend class nmethodLocker;
225 // For native wrappers
226 nmethod(methodOop method,
227 int nmethod_size,
228 CodeOffsets* offsets,
229 CodeBuffer *code_buffer,
230 int frame_size,
231 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
232 ByteSize basic_lock_sp_offset, /* synchronized natives only */
233 OopMapSet* oop_maps);
235 #ifdef HAVE_DTRACE_H
236 // For native wrappers
237 nmethod(methodOop method,
238 int nmethod_size,
239 CodeOffsets* offsets,
240 CodeBuffer *code_buffer,
241 int frame_size);
242 #endif // def HAVE_DTRACE_H
244 // Creation support
245 nmethod(methodOop method,
246 int nmethod_size,
247 int compile_id,
248 int entry_bci,
249 CodeOffsets* offsets,
250 int orig_pc_offset,
251 DebugInformationRecorder *recorder,
252 Dependencies* dependencies,
253 CodeBuffer *code_buffer,
254 int frame_size,
255 OopMapSet* oop_maps,
256 ExceptionHandlerTable* handler_table,
257 ImplicitExceptionTable* nul_chk_table,
258 AbstractCompiler* compiler,
259 int comp_level);
261 // helper methods
262 void* operator new(size_t size, int nmethod_size);
264 const char* reloc_string_for(u_char* begin, u_char* end);
265 // Returns true if this thread changed the state of the nmethod or
266 // false if another thread performed the transition.
267 bool make_not_entrant_or_zombie(unsigned int state);
268 void inc_decompile_count();
270 // used to check that writes to nmFlags are done consistently.
271 static void check_safepoint() PRODUCT_RETURN;
273 // Used to manipulate the exception cache
274 void add_exception_cache_entry(ExceptionCache* new_entry);
275 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
277 // Inform external interfaces that a compiled method has been unloaded
278 inline void post_compiled_method_unload();
280 public:
281 // create nmethod with entry_bci
282 static nmethod* new_nmethod(methodHandle method,
283 int compile_id,
284 int entry_bci,
285 CodeOffsets* offsets,
286 int orig_pc_offset,
287 DebugInformationRecorder* recorder,
288 Dependencies* dependencies,
289 CodeBuffer *code_buffer,
290 int frame_size,
291 OopMapSet* oop_maps,
292 ExceptionHandlerTable* handler_table,
293 ImplicitExceptionTable* nul_chk_table,
294 AbstractCompiler* compiler,
295 int comp_level);
297 static nmethod* new_native_nmethod(methodHandle method,
298 CodeBuffer *code_buffer,
299 int vep_offset,
300 int frame_complete,
301 int frame_size,
302 ByteSize receiver_sp_offset,
303 ByteSize basic_lock_sp_offset,
304 OopMapSet* oop_maps);
306 #ifdef HAVE_DTRACE_H
307 // The method we generate for a dtrace probe has to look
308 // like an nmethod as far as the rest of the system is concerned
309 // which is somewhat unfortunate.
310 static nmethod* new_dtrace_nmethod(methodHandle method,
311 CodeBuffer *code_buffer,
312 int vep_offset,
313 int trap_offset,
314 int frame_complete,
315 int frame_size);
317 int trap_offset() const { return _trap_offset; }
318 address trap_address() const { return code_begin() + _trap_offset; }
320 #endif // def HAVE_DTRACE_H
322 // accessors
323 methodOop method() const { return _method; }
324 AbstractCompiler* compiler() const { return _compiler; }
326 #ifndef PRODUCT
327 bool has_debug_info() const { return _has_debug_info; }
328 void set_has_debug_info(bool f) { _has_debug_info = false; }
329 #endif // NOT PRODUCT
331 // type info
332 bool is_nmethod() const { return true; }
333 bool is_java_method() const { return !method()->is_native(); }
334 bool is_native_method() const { return method()->is_native(); }
335 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
337 bool is_compiled_by_c1() const;
338 bool is_compiled_by_c2() const;
340 // boundaries for different parts
341 address code_begin () const { return _entry_point; }
342 address code_end () const { return header_begin() + _stub_offset ; }
343 address exception_begin () const { return header_begin() + _exception_offset ; }
344 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
345 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
346 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
347 address stub_begin () const { return header_begin() + _stub_offset ; }
348 address stub_end () const { return header_begin() + _consts_offset ; }
349 address consts_begin () const { return header_begin() + _consts_offset ; }
350 address consts_end () const { return header_begin() + _scopes_data_offset ; }
351 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
352 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
353 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
354 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
355 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
356 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
357 address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
358 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
359 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
360 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
362 int code_size () const { return code_end () - code_begin (); }
363 int stub_size () const { return stub_end () - stub_begin (); }
364 int consts_size () const { return consts_end () - consts_begin (); }
365 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
366 int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); }
367 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
368 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
369 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
371 int total_size () const;
373 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
374 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
375 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_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 flags.state == alive; }
387 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
388 bool is_not_entrant() const { return flags.state == not_entrant; }
389 bool is_zombie() const { return flags.state == zombie; }
390 bool is_unloaded() const { return flags.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 _markedForDeoptimization; }
404 void mark_for_deoptimization() { _markedForDeoptimization = 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 flags.hasFlushedDependencies; }
411 void set_has_flushed_dependencies() {
412 assert(!has_flushed_dependencies(), "should only happen once");
413 flags.hasFlushedDependencies = 1;
414 }
416 bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
417 void mark_for_reclamation() { flags.markedForReclamation = 1; }
418 void unmark_for_reclamation() { flags.markedForReclamation = 0; }
420 bool has_unsafe_access() const { return flags.has_unsafe_access; }
421 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
423 bool has_method_handle_invokes() const { return flags.has_method_handle_invokes; }
424 void set_has_method_handle_invokes(bool z) { flags.has_method_handle_invokes = z; }
426 bool is_speculatively_disconnected() const { return flags.speculatively_disconnected; }
427 void set_speculatively_disconnected(bool z) { flags.speculatively_disconnected = z; }
429 int comp_level() const { return _comp_level; }
431 int version() const { return flags.version; }
432 void set_version(int v);
434 // Non-perm oop support
435 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
436 protected:
437 enum { npl_on_list = 0x01, npl_marked = 0x10 };
438 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
439 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
440 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
441 #ifndef PRODUCT
442 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
443 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
444 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
445 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
446 #endif //PRODUCT
447 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
448 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
450 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
451 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
453 public:
455 // Sweeper support
456 long stack_traversal_mark() { return _stack_traversal_mark; }
457 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
459 // Exception cache support
460 ExceptionCache* exception_cache() const { return _exception_cache; }
461 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
462 address handler_for_exception_and_pc(Handle exception, address pc);
463 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
464 void remove_from_exception_cache(ExceptionCache* ec);
466 // implicit exceptions support
467 address continuation_for_implicit_exception(address pc);
469 // On-stack replacement support
470 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
471 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
472 void invalidate_osr_method();
473 nmethod* osr_link() const { return _osr_link; }
474 void set_osr_link(nmethod *n) { _osr_link = n; }
476 // tells whether frames described by this nmethod can be deoptimized
477 // note: native wrappers cannot be deoptimized.
478 bool can_be_deoptimized() const { return is_java_method(); }
480 // Inline cache support
481 void clear_inline_caches();
482 void cleanup_inline_caches();
483 bool inlinecache_check_contains(address addr) const {
484 return (addr >= instructions_begin() && addr < verified_entry_point());
485 }
487 // unlink and deallocate this nmethod
488 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
489 // expected to use any other private methods/data in this class.
491 protected:
492 void flush();
494 public:
495 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
496 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
497 bool is_locked_by_vm() const { return _lock_count >0; }
499 // See comment at definition of _last_seen_on_stack
500 void mark_as_seen_on_stack();
501 bool can_not_entrant_be_converted();
503 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
504 void set_method(methodOop method) { _method = method; }
506 // GC support
507 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
508 bool unloading_occurred);
509 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
510 oop* root, bool unloading_occurred);
512 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
513 OopClosure* f);
514 virtual void oops_do(OopClosure* f) { oops_do(f, false); }
515 void oops_do(OopClosure* f, bool do_strong_roots_only);
516 bool detect_scavenge_root_oops();
517 void verify_scavenge_root_oops() PRODUCT_RETURN;
519 bool test_set_oops_do_mark();
520 static void oops_do_marking_prologue();
521 static void oops_do_marking_epilogue();
522 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
523 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
525 // ScopeDesc for an instruction
526 ScopeDesc* scope_desc_at(address pc);
528 private:
529 ScopeDesc* scope_desc_in(address begin, address end);
531 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
533 PcDesc* find_pc_desc_internal(address pc, bool approximate);
535 PcDesc* find_pc_desc(address pc, bool approximate) {
536 PcDesc* desc = _pc_desc_cache.last_pc_desc();
537 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
538 return desc;
539 }
540 return find_pc_desc_internal(pc, approximate);
541 }
543 public:
544 // ScopeDesc retrieval operation
545 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
546 // pc_desc_near returns the first PcDesc at or after the givne pc.
547 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
549 public:
550 // copying of debugging information
551 void copy_scopes_pcs(PcDesc* pcs, int count);
552 void copy_scopes_data(address buffer, int size);
554 // Deopt
555 // Return true is the PC is one would expect if the frame is being deopted.
556 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
557 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
558 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
559 // Accessor/mutator for the original pc of a frame before a frame was deopted.
560 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
561 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
563 static address get_deopt_original_pc(const frame* fr);
565 // MethodHandle
566 bool is_method_handle_return(address return_pc);
568 // jvmti support:
569 void post_compiled_method_load_event();
571 // verify operations
572 void verify();
573 void verify_scopes();
574 void verify_interrupt_point(address interrupt_point);
576 // printing support
577 void print() const;
578 void print_code();
579 void print_relocations() PRODUCT_RETURN;
580 void print_pcs() PRODUCT_RETURN;
581 void print_scopes() PRODUCT_RETURN;
582 void print_dependencies() PRODUCT_RETURN;
583 void print_value_on(outputStream* st) const PRODUCT_RETURN;
584 void print_calls(outputStream* st) PRODUCT_RETURN;
585 void print_handler_table() PRODUCT_RETURN;
586 void print_nul_chk_table() PRODUCT_RETURN;
587 void print_nmethod(bool print_code);
589 void print_on(outputStream* st, const char* title) const;
591 // Logging
592 void log_identity(xmlStream* log) const;
593 void log_new_nmethod() const;
594 void log_state_change() const;
596 // Prints block-level comments, including nmethod specific block labels:
597 virtual void print_block_comment(outputStream* stream, address block_begin) {
598 print_nmethod_labels(stream, block_begin);
599 CodeBlob::print_block_comment(stream, block_begin);
600 }
601 void print_nmethod_labels(outputStream* stream, address block_begin);
603 // Prints a comment for one native instruction (reloc info, pc desc)
604 void print_code_comment_on(outputStream* st, int column, address begin, address end);
605 static void print_statistics() PRODUCT_RETURN;
607 // Compiler task identification. Note that all OSR methods
608 // are numbered in an independent sequence if CICountOSR is true,
609 // and native method wrappers are also numbered independently if
610 // CICountNative is true.
611 int compile_id() const { return _compile_id; }
612 const char* compile_kind() const;
614 // For debugging
615 // CompiledIC* IC_at(char* p) const;
616 // PrimitiveIC* primitiveIC_at(char* p) const;
617 oop embeddedOop_at(address p);
619 // tells if any of this method's dependencies have been invalidated
620 // (this is expensive!)
621 bool check_all_dependencies();
623 // tells if this compiled method is dependent on the given changes,
624 // and the changes have invalidated it
625 bool check_dependency_on(DepChange& changes);
627 // Evolution support. Tells if this compiled method is dependent on any of
628 // methods m() of class dependee, such that if m() in dependee is replaced,
629 // this compiled method will have to be deoptimized.
630 bool is_evol_dependent_on(klassOop dependee);
632 // Fast breakpoint support. Tells if this compiled method is
633 // dependent on the given method. Returns true if this nmethod
634 // corresponds to the given method as well.
635 bool is_dependent_on_method(methodOop dependee);
637 // is it ok to patch at address?
638 bool is_patchable_at(address instr_address);
640 // UseBiasedLocking support
641 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
642 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
643 }
644 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
645 return _compiled_synchronized_native_basic_lock_sp_offset;
646 }
648 // support for code generation
649 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
650 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
651 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
653 };
655 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
656 class nmethodLocker : public StackObj {
657 nmethod* _nm;
659 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
660 static void unlock_nmethod(nmethod* nm); // (ditto)
662 public:
663 nmethodLocker(address pc); // derive nm from pc
664 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
665 nmethodLocker() { _nm = NULL; }
666 ~nmethodLocker() { unlock_nmethod(_nm); }
668 nmethod* code() { return _nm; }
669 void set_code(nmethod* new_nm) {
670 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
671 _nm = new_nm;
672 lock_nmethod(_nm);
673 }
674 };