Tue, 25 Sep 2012 14:58:12 +0200
7200470: KeepAliveClosure not needed in CodeCache::do_unloading
Summary: Removed the unused keep_alive parameter
Reviewed-by: stefank, dholmes, kamg, coleenp
1 /*
2 * Copyright (c) 1997, 2012, 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 #ifndef SHARE_VM_CODE_NMETHOD_HPP
26 #define SHARE_VM_CODE_NMETHOD_HPP
28 #include "code/codeBlob.hpp"
29 #include "code/pcDesc.hpp"
30 #include "oops/metadata.hpp"
32 // This class is used internally by nmethods, to cache
33 // exception/pc/handler information.
35 class ExceptionCache : public CHeapObj<mtCode> {
36 friend class VMStructs;
37 private:
38 enum { cache_size = 16 };
39 Klass* _exception_type;
40 address _pc[cache_size];
41 address _handler[cache_size];
42 int _count;
43 ExceptionCache* _next;
45 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
46 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
47 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
48 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
49 int count() { return _count; }
50 void increment_count() { _count++; }
52 public:
54 ExceptionCache(Handle exception, address pc, address handler);
56 Klass* exception_type() { return _exception_type; }
57 ExceptionCache* next() { return _next; }
58 void set_next(ExceptionCache *ec) { _next = ec; }
60 address match(Handle exception, address pc);
61 bool match_exception_with_space(Handle exception) ;
62 address test_address(address addr);
63 bool add_address_and_handler(address addr, address handler) ;
64 };
67 // cache pc descs found in earlier inquiries
68 class PcDescCache VALUE_OBJ_CLASS_SPEC {
69 friend class VMStructs;
70 private:
71 enum { cache_size = 4 };
72 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found
73 public:
74 PcDescCache() { debug_only(_pc_descs[0] = NULL); }
75 void reset_to(PcDesc* initial_pc_desc);
76 PcDesc* find_pc_desc(int pc_offset, bool approximate);
77 void add_pc_desc(PcDesc* pc_desc);
78 PcDesc* last_pc_desc() { return _pc_descs[0]; }
79 };
82 // nmethods (native methods) are the compiled code versions of Java methods.
83 //
84 // An nmethod contains:
85 // - header (the nmethod structure)
86 // [Relocation]
87 // - relocation information
88 // - constant part (doubles, longs and floats used in nmethod)
89 // - oop table
90 // [Code]
91 // - code body
92 // - exception handler
93 // - stub code
94 // [Debugging information]
95 // - oop array
96 // - data array
97 // - pcs
98 // [Exception handler table]
99 // - handler entry point array
100 // [Implicit Null Pointer exception table]
101 // - implicit null table array
103 class Dependencies;
104 class ExceptionHandlerTable;
105 class ImplicitExceptionTable;
106 class AbstractCompiler;
107 class xmlStream;
109 class nmethod : public CodeBlob {
110 friend class VMStructs;
111 friend class NMethodSweeper;
112 friend class CodeCache; // scavengable oops
113 private:
114 // Shared fields for all nmethod's
115 Method* _method;
116 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
117 jmethodID _jmethod_id; // Cache of method()->jmethod_id()
119 // To support simple linked-list chaining of nmethods:
120 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head
121 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
122 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
124 static nmethod* volatile _oops_do_mark_nmethods;
125 nmethod* volatile _oops_do_mark_link;
127 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
129 // offsets for entry points
130 address _entry_point; // entry point with class check
131 address _verified_entry_point; // entry point without class check
132 address _osr_entry_point; // entry point for on stack replacement
134 // Offsets for different nmethod parts
135 int _exception_offset;
136 // All deoptee's will resume execution at this location described by
137 // this offset.
138 int _deoptimize_offset;
139 // All deoptee's at a MethodHandle call site will resume execution
140 // at this location described by this offset.
141 int _deoptimize_mh_offset;
142 // Offset of the unwind handler if it exists
143 int _unwind_handler_offset;
145 #ifdef HAVE_DTRACE_H
146 int _trap_offset;
147 #endif // def HAVE_DTRACE_H
148 int _consts_offset;
149 int _stub_offset;
150 int _oops_offset; // offset to where embedded oop table begins (inside data)
151 int _metadata_offset; // embedded meta data table
152 int _scopes_data_offset;
153 int _scopes_pcs_offset;
154 int _dependencies_offset;
155 int _handler_table_offset;
156 int _nul_chk_table_offset;
157 int _nmethod_end_offset;
159 // location in frame (offset for sp) that deopt can store the original
160 // pc during a deopt.
161 int _orig_pc_offset;
163 int _compile_id; // which compilation made this nmethod
164 int _comp_level; // compilation level
166 // protected by CodeCache_lock
167 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
168 bool _speculatively_disconnected; // Marked for potential unload
170 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
171 bool _marked_for_deoptimization; // Used for stack deoptimization
173 // used by jvmti to track if an unload event has been posted for this nmethod.
174 bool _unload_reported;
176 // set during construction
177 unsigned int _has_unsafe_access:1; // May fault due to unsafe access.
178 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
179 unsigned int _lazy_critical_native:1; // Lazy JNI critical native
181 // Protected by Patching_lock
182 unsigned char _state; // {alive, not_entrant, zombie, unloaded}
184 #ifdef ASSERT
185 bool _oops_are_stale; // indicates that it's no longer safe to access oops section
186 #endif
188 enum { alive = 0,
189 not_entrant = 1, // uncommon trap has happened but activations may still exist
190 zombie = 2,
191 unloaded = 3 };
194 jbyte _scavenge_root_state;
196 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed
197 // and is not made into a zombie. However, once the nmethod is made into
198 // a zombie, it will be locked one final time if CompiledMethodUnload
199 // event processing needs to be done.
200 jint _lock_count;
202 // not_entrant method removal. Each mark_sweep pass will update
203 // this mark to current sweep invocation count if it is seen on the
204 // stack. An not_entrant method can be removed when there is no
205 // more activations, i.e., when the _stack_traversal_mark is less than
206 // current sweep traversal index.
207 long _stack_traversal_mark;
209 ExceptionCache *_exception_cache;
210 PcDescCache _pc_desc_cache;
212 // These are used for compiled synchronized native methods to
213 // locate the owner and stack slot for the BasicLock so that we can
214 // properly revoke the bias of the owner if necessary. They are
215 // needed because there is no debug information for compiled native
216 // wrappers and the oop maps are insufficient to allow
217 // frame::retrieve_receiver() to work. Currently they are expected
218 // to be byte offsets from the Java stack pointer for maximum code
219 // sharing between platforms. Note that currently biased locking
220 // will never cause Class instances to be biased but this code
221 // handles the static synchronized case as well.
222 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver
223 // for non-static native wrapper frames.
224 ByteSize _native_receiver_sp_offset;
225 ByteSize _native_basic_lock_sp_offset;
227 friend class nmethodLocker;
229 // For native wrappers
230 nmethod(Method* method,
231 int nmethod_size,
232 int compile_id,
233 CodeOffsets* offsets,
234 CodeBuffer *code_buffer,
235 int frame_size,
236 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
237 ByteSize basic_lock_sp_offset, /* synchronized natives only */
238 OopMapSet* oop_maps);
240 #ifdef HAVE_DTRACE_H
241 // For native wrappers
242 nmethod(Method* method,
243 int nmethod_size,
244 CodeOffsets* offsets,
245 CodeBuffer *code_buffer,
246 int frame_size);
247 #endif // def HAVE_DTRACE_H
249 // Creation support
250 nmethod(Method* method,
251 int nmethod_size,
252 int compile_id,
253 int entry_bci,
254 CodeOffsets* offsets,
255 int orig_pc_offset,
256 DebugInformationRecorder *recorder,
257 Dependencies* dependencies,
258 CodeBuffer *code_buffer,
259 int frame_size,
260 OopMapSet* oop_maps,
261 ExceptionHandlerTable* handler_table,
262 ImplicitExceptionTable* nul_chk_table,
263 AbstractCompiler* compiler,
264 int comp_level);
266 // helper methods
267 void* operator new(size_t size, int nmethod_size);
269 const char* reloc_string_for(u_char* begin, u_char* end);
270 // Returns true if this thread changed the state of the nmethod or
271 // false if another thread performed the transition.
272 bool make_not_entrant_or_zombie(unsigned int state);
273 void inc_decompile_count();
275 // Used to manipulate the exception cache
276 void add_exception_cache_entry(ExceptionCache* new_entry);
277 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
279 // Inform external interfaces that a compiled method has been unloaded
280 void post_compiled_method_unload();
282 // Initailize fields to their default values
283 void init_defaults();
285 public:
286 // create nmethod with entry_bci
287 static nmethod* new_nmethod(methodHandle method,
288 int compile_id,
289 int entry_bci,
290 CodeOffsets* offsets,
291 int orig_pc_offset,
292 DebugInformationRecorder* recorder,
293 Dependencies* dependencies,
294 CodeBuffer *code_buffer,
295 int frame_size,
296 OopMapSet* oop_maps,
297 ExceptionHandlerTable* handler_table,
298 ImplicitExceptionTable* nul_chk_table,
299 AbstractCompiler* compiler,
300 int comp_level);
302 static nmethod* new_native_nmethod(methodHandle method,
303 int compile_id,
304 CodeBuffer *code_buffer,
305 int vep_offset,
306 int frame_complete,
307 int frame_size,
308 ByteSize receiver_sp_offset,
309 ByteSize basic_lock_sp_offset,
310 OopMapSet* oop_maps);
312 #ifdef HAVE_DTRACE_H
313 // The method we generate for a dtrace probe has to look
314 // like an nmethod as far as the rest of the system is concerned
315 // which is somewhat unfortunate.
316 static nmethod* new_dtrace_nmethod(methodHandle method,
317 CodeBuffer *code_buffer,
318 int vep_offset,
319 int trap_offset,
320 int frame_complete,
321 int frame_size);
323 int trap_offset() const { return _trap_offset; }
324 address trap_address() const { return insts_begin() + _trap_offset; }
326 #endif // def HAVE_DTRACE_H
328 // accessors
329 Method* method() const { return _method; }
330 AbstractCompiler* compiler() const { return _compiler; }
332 // type info
333 bool is_nmethod() const { return true; }
334 bool is_java_method() const { return !method()->is_native(); }
335 bool is_native_method() const { return method()->is_native(); }
336 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
338 bool is_compiled_by_c1() const;
339 bool is_compiled_by_c2() const;
340 bool is_compiled_by_shark() const;
342 // boundaries for different parts
343 address consts_begin () const { return header_begin() + _consts_offset ; }
344 address consts_end () const { return header_begin() + code_offset() ; }
345 address insts_begin () const { return header_begin() + code_offset() ; }
346 address insts_end () const { return header_begin() + _stub_offset ; }
347 address stub_begin () const { return header_begin() + _stub_offset ; }
348 address stub_end () const { return header_begin() + _oops_offset ; }
349 address exception_begin () const { return header_begin() + _exception_offset ; }
350 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
351 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
352 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
353 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
354 oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; }
356 Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; }
357 Metadata** metadata_end () const { return (Metadata**) (header_begin() + _scopes_data_offset) ; }
359 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
360 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
361 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
362 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
363 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
364 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
365 address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
366 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
367 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
368 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
370 // Sizes
371 int consts_size () const { return consts_end () - consts_begin (); }
372 int insts_size () const { return insts_end () - insts_begin (); }
373 int stub_size () const { return stub_end () - stub_begin (); }
374 int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
375 int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); }
376 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
377 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
378 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
379 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
380 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
382 int total_size () const;
384 // Containment
385 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
386 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
387 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
388 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
389 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); }
390 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
391 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
392 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
393 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
395 // entry points
396 address entry_point() const { return _entry_point; } // normal entry point
397 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
399 // flag accessing and manipulation
400 bool is_in_use() const { return _state == alive; }
401 bool is_alive() const { return _state == alive || _state == not_entrant; }
402 bool is_not_entrant() const { return _state == not_entrant; }
403 bool is_zombie() const { return _state == zombie; }
404 bool is_unloaded() const { return _state == unloaded; }
406 // Make the nmethod non entrant. The nmethod will continue to be
407 // alive. It is used when an uncommon trap happens. Returns true
408 // if this thread changed the state of the nmethod or false if
409 // another thread performed the transition.
410 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
411 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
413 // used by jvmti to track if the unload event has been reported
414 bool unload_reported() { return _unload_reported; }
415 void set_unload_reported() { _unload_reported = true; }
417 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; }
418 void mark_for_deoptimization() { _marked_for_deoptimization = true; }
420 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
422 bool has_dependencies() { return dependencies_size() != 0; }
423 void flush_dependencies(BoolObjectClosure* is_alive);
424 bool has_flushed_dependencies() { return _has_flushed_dependencies; }
425 void set_has_flushed_dependencies() {
426 assert(!has_flushed_dependencies(), "should only happen once");
427 _has_flushed_dependencies = 1;
428 }
430 bool is_marked_for_reclamation() const { return _marked_for_reclamation; }
431 void mark_for_reclamation() { _marked_for_reclamation = 1; }
433 bool has_unsafe_access() const { return _has_unsafe_access; }
434 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
436 bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
437 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
439 bool is_speculatively_disconnected() const { return _speculatively_disconnected; }
440 void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; }
442 bool is_lazy_critical_native() const { return _lazy_critical_native; }
443 void set_lazy_critical_native(bool z) { _lazy_critical_native = z; }
445 int comp_level() const { return _comp_level; }
447 // Support for oops in scopes and relocs:
448 // Note: index 0 is reserved for null.
449 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
450 oop* oop_addr_at(int index) const { // for GC
451 // relocation indexes are biased by 1 (because 0 is reserved)
452 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
453 assert(!_oops_are_stale, "oops are stale");
454 return &oops_begin()[index - 1];
455 }
457 // Support for meta data in scopes and relocs:
458 // Note: index 0 is reserved for null.
459 Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); }
460 Metadata** metadata_addr_at(int index) const { // for GC
461 // relocation indexes are biased by 1 (because 0 is reserved)
462 assert(index > 0 && index <= metadata_size(), "must be a valid non-zero index");
463 return &metadata_begin()[index - 1];
464 }
466 void copy_values(GrowableArray<jobject>* oops);
467 void copy_values(GrowableArray<Metadata*>* metadata);
469 // Relocation support
470 private:
471 void fix_oop_relocations(address begin, address end, bool initialize_immediates);
472 inline void initialize_immediate_oop(oop* dest, jobject handle);
474 public:
475 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
476 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
477 void verify_oop_relocations();
479 bool is_at_poll_return(address pc);
480 bool is_at_poll_or_poll_return(address pc);
482 // Scavengable oop support
483 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
484 protected:
485 enum { sl_on_list = 0x01, sl_marked = 0x10 };
486 void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; }
487 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
488 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
489 #ifndef PRODUCT
490 void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; }
491 void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; }
492 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; }
493 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
494 #endif //PRODUCT
495 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
496 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
498 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
499 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
501 public:
503 // Sweeper support
504 long stack_traversal_mark() { return _stack_traversal_mark; }
505 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
507 // Exception cache support
508 ExceptionCache* exception_cache() const { return _exception_cache; }
509 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
510 address handler_for_exception_and_pc(Handle exception, address pc);
511 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
512 void remove_from_exception_cache(ExceptionCache* ec);
514 // implicit exceptions support
515 address continuation_for_implicit_exception(address pc);
517 // On-stack replacement support
518 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; }
519 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; }
520 void invalidate_osr_method();
521 nmethod* osr_link() const { return _osr_link; }
522 void set_osr_link(nmethod *n) { _osr_link = n; }
524 // tells whether frames described by this nmethod can be deoptimized
525 // note: native wrappers cannot be deoptimized.
526 bool can_be_deoptimized() const { return is_java_method(); }
528 // Inline cache support
529 void clear_inline_caches();
530 void cleanup_inline_caches();
531 bool inlinecache_check_contains(address addr) const {
532 return (addr >= code_begin() && addr < verified_entry_point());
533 }
535 // Check that all metadata is still alive
536 void verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive);
538 // unlink and deallocate this nmethod
539 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
540 // expected to use any other private methods/data in this class.
542 protected:
543 void flush();
545 public:
546 // When true is returned, it is unsafe to remove this nmethod even if
547 // it is a zombie, since the VM or the ServiceThread might still be
548 // using it.
549 bool is_locked_by_vm() const { return _lock_count >0; }
551 // See comment at definition of _last_seen_on_stack
552 void mark_as_seen_on_stack();
553 bool can_not_entrant_be_converted();
555 // Evolution support. We make old (discarded) compiled methods point to new Method*s.
556 void set_method(Method* method) { _method = method; }
558 // GC support
559 void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
560 bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred);
562 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
563 OopClosure* f);
564 void oops_do(OopClosure* f) { oops_do(f, false); }
565 void oops_do(OopClosure* f, bool do_strong_roots_only);
566 bool detect_scavenge_root_oops();
567 void verify_scavenge_root_oops() PRODUCT_RETURN;
569 bool test_set_oops_do_mark();
570 static void oops_do_marking_prologue();
571 static void oops_do_marking_epilogue();
572 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
573 bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }
575 // ScopeDesc for an instruction
576 ScopeDesc* scope_desc_at(address pc);
578 private:
579 ScopeDesc* scope_desc_in(address begin, address end);
581 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
583 PcDesc* find_pc_desc_internal(address pc, bool approximate);
585 PcDesc* find_pc_desc(address pc, bool approximate) {
586 PcDesc* desc = _pc_desc_cache.last_pc_desc();
587 if (desc != NULL && desc->pc_offset() == pc - code_begin()) {
588 return desc;
589 }
590 return find_pc_desc_internal(pc, approximate);
591 }
593 public:
594 // ScopeDesc retrieval operation
595 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
596 // pc_desc_near returns the first PcDesc at or after the givne pc.
597 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
599 public:
600 // copying of debugging information
601 void copy_scopes_pcs(PcDesc* pcs, int count);
602 void copy_scopes_data(address buffer, int size);
604 // Deopt
605 // Return true is the PC is one would expect if the frame is being deopted.
606 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
607 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
608 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
609 // Accessor/mutator for the original pc of a frame before a frame was deopted.
610 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
611 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
613 static address get_deopt_original_pc(const frame* fr);
615 // MethodHandle
616 bool is_method_handle_return(address return_pc);
618 // jvmti support:
619 void post_compiled_method_load_event();
620 jmethodID get_and_cache_jmethod_id();
622 // verify operations
623 void verify();
624 void verify_scopes();
625 void verify_interrupt_point(address interrupt_point);
627 // printing support
628 void print() const;
629 void print_code();
630 void print_relocations() PRODUCT_RETURN;
631 void print_pcs() PRODUCT_RETURN;
632 void print_scopes() PRODUCT_RETURN;
633 void print_dependencies() PRODUCT_RETURN;
634 void print_value_on(outputStream* st) const PRODUCT_RETURN;
635 void print_calls(outputStream* st) PRODUCT_RETURN;
636 void print_handler_table() PRODUCT_RETURN;
637 void print_nul_chk_table() PRODUCT_RETURN;
638 void print_nmethod(bool print_code);
640 // need to re-define this from CodeBlob else the overload hides it
641 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
642 void print_on(outputStream* st, const char* msg) const;
644 // Logging
645 void log_identity(xmlStream* log) const;
646 void log_new_nmethod() const;
647 void log_state_change() const;
649 // Prints block-level comments, including nmethod specific block labels:
650 virtual void print_block_comment(outputStream* stream, address block_begin) {
651 print_nmethod_labels(stream, block_begin);
652 CodeBlob::print_block_comment(stream, block_begin);
653 }
654 void print_nmethod_labels(outputStream* stream, address block_begin);
656 // Prints a comment for one native instruction (reloc info, pc desc)
657 void print_code_comment_on(outputStream* st, int column, address begin, address end);
658 static void print_statistics() PRODUCT_RETURN;
660 // Compiler task identification. Note that all OSR methods
661 // are numbered in an independent sequence if CICountOSR is true,
662 // and native method wrappers are also numbered independently if
663 // CICountNative is true.
664 int compile_id() const { return _compile_id; }
665 const char* compile_kind() const;
667 // For debugging
668 // CompiledIC* IC_at(char* p) const;
669 // PrimitiveIC* primitiveIC_at(char* p) const;
670 oop embeddedOop_at(address p);
672 // tells if any of this method's dependencies have been invalidated
673 // (this is expensive!)
674 bool check_all_dependencies();
676 // tells if this compiled method is dependent on the given changes,
677 // and the changes have invalidated it
678 bool check_dependency_on(DepChange& changes);
680 // Evolution support. Tells if this compiled method is dependent on any of
681 // methods m() of class dependee, such that if m() in dependee is replaced,
682 // this compiled method will have to be deoptimized.
683 bool is_evol_dependent_on(Klass* dependee);
685 // Fast breakpoint support. Tells if this compiled method is
686 // dependent on the given method. Returns true if this nmethod
687 // corresponds to the given method as well.
688 bool is_dependent_on_method(Method* dependee);
690 // is it ok to patch at address?
691 bool is_patchable_at(address instr_address);
693 // UseBiasedLocking support
694 ByteSize native_receiver_sp_offset() {
695 return _native_receiver_sp_offset;
696 }
697 ByteSize native_basic_lock_sp_offset() {
698 return _native_basic_lock_sp_offset;
699 }
701 // support for code generation
702 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
703 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
704 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
706 // RedefineClasses support. Mark metadata in nmethods as on_stack so that
707 // redefine classes doesn't purge it.
708 static void mark_on_stack(nmethod* nm) {
709 nm->metadata_do(Metadata::mark_on_stack);
710 }
711 void metadata_do(void f(Metadata*));
712 };
714 // Locks an nmethod so its code will not get removed and it will not
715 // be made into a zombie, even if it is a not_entrant method. After the
716 // nmethod becomes a zombie, if CompiledMethodUnload event processing
717 // needs to be done, then lock_nmethod() is used directly to keep the
718 // generated code from being reused too early.
719 class nmethodLocker : public StackObj {
720 nmethod* _nm;
722 public:
724 // note: nm can be NULL
725 // Only JvmtiDeferredEvent::compiled_method_unload_event()
726 // should pass zombie_ok == true.
727 static void lock_nmethod(nmethod* nm, bool zombie_ok = false);
728 static void unlock_nmethod(nmethod* nm); // (ditto)
730 nmethodLocker(address pc); // derive nm from pc
731 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
732 nmethodLocker() { _nm = NULL; }
733 ~nmethodLocker() { unlock_nmethod(_nm); }
735 nmethod* code() { return _nm; }
736 void set_code(nmethod* new_nm) {
737 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
738 _nm = new_nm;
739 lock_nmethod(_nm);
740 }
741 };
743 #endif // SHARE_VM_CODE_NMETHOD_HPP