Fri, 11 Mar 2011 16:09:55 -0500
7023931: PcDescCache::find_pc_desc should not write _last_pc_desc
Summary: Remove _last_pc_desc and use pcdescs[0] instead.
Reviewed-by: dcubed, coleenp, ysr
1 /*
2 * Copyright (c) 1997, 2011, 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"
31 // This class is used internally by nmethods, to cache
32 // exception/pc/handler information.
34 class ExceptionCache : public CHeapObj {
35 friend class VMStructs;
36 private:
37 enum { cache_size = 16 };
38 klassOop _exception_type;
39 address _pc[cache_size];
40 address _handler[cache_size];
41 int _count;
42 ExceptionCache* _next;
44 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
45 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
46 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
47 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
48 int count() { return _count; }
49 void increment_count() { _count++; }
51 public:
53 ExceptionCache(Handle exception, address pc, address handler);
55 klassOop exception_type() { return _exception_type; }
56 klassOop* exception_type_addr() { 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; // non-perm oops
113 private:
114 // Shared fields for all nmethod's
115 methodOop _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 _scopes_data_offset;
152 int _scopes_pcs_offset;
153 int _dependencies_offset;
154 int _handler_table_offset;
155 int _nul_chk_table_offset;
156 int _nmethod_end_offset;
158 // location in frame (offset for sp) that deopt can store the original
159 // pc during a deopt.
160 int _orig_pc_offset;
162 int _compile_id; // which compilation made this nmethod
163 int _comp_level; // compilation level
165 // protected by CodeCache_lock
166 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
167 bool _speculatively_disconnected; // Marked for potential unload
169 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
170 bool _marked_for_deoptimization; // Used for stack deoptimization
172 // used by jvmti to track if an unload event has been posted for this nmethod.
173 bool _unload_reported;
175 // set during construction
176 unsigned int _has_unsafe_access:1; // May fault due to unsafe access.
177 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
179 // Protected by Patching_lock
180 unsigned char _state; // {alive, not_entrant, zombie, unloaded}
182 #ifdef ASSERT
183 bool _oops_are_stale; // indicates that it's no longer safe to access oops section
184 #endif
186 enum { alive = 0,
187 not_entrant = 1, // uncommon trap has happened but activations may still exist
188 zombie = 2,
189 unloaded = 3 };
192 jbyte _scavenge_root_state;
194 NOT_PRODUCT(bool _has_debug_info; )
196 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
197 jint _lock_count;
199 // not_entrant method removal. Each mark_sweep pass will update
200 // this mark to current sweep invocation count if it is seen on the
201 // stack. An not_entrant method can be removed when there is no
202 // more activations, i.e., when the _stack_traversal_mark is less than
203 // current sweep traversal index.
204 long _stack_traversal_mark;
206 ExceptionCache *_exception_cache;
207 PcDescCache _pc_desc_cache;
209 // These are used for compiled synchronized native methods to
210 // locate the owner and stack slot for the BasicLock so that we can
211 // properly revoke the bias of the owner if necessary. They are
212 // needed because there is no debug information for compiled native
213 // wrappers and the oop maps are insufficient to allow
214 // frame::retrieve_receiver() to work. Currently they are expected
215 // to be byte offsets from the Java stack pointer for maximum code
216 // sharing between platforms. Note that currently biased locking
217 // will never cause Class instances to be biased but this code
218 // handles the static synchronized case as well.
219 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver
220 // for non-static native wrapper frames.
221 ByteSize _native_receiver_sp_offset;
222 ByteSize _native_basic_lock_sp_offset;
224 friend class nmethodLocker;
226 // For native wrappers
227 nmethod(methodOop method,
228 int nmethod_size,
229 CodeOffsets* offsets,
230 CodeBuffer *code_buffer,
231 int frame_size,
232 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
233 ByteSize basic_lock_sp_offset, /* synchronized natives only */
234 OopMapSet* oop_maps);
236 #ifdef HAVE_DTRACE_H
237 // For native wrappers
238 nmethod(methodOop method,
239 int nmethod_size,
240 CodeOffsets* offsets,
241 CodeBuffer *code_buffer,
242 int frame_size);
243 #endif // def HAVE_DTRACE_H
245 // Creation support
246 nmethod(methodOop method,
247 int nmethod_size,
248 int compile_id,
249 int entry_bci,
250 CodeOffsets* offsets,
251 int orig_pc_offset,
252 DebugInformationRecorder *recorder,
253 Dependencies* dependencies,
254 CodeBuffer *code_buffer,
255 int frame_size,
256 OopMapSet* oop_maps,
257 ExceptionHandlerTable* handler_table,
258 ImplicitExceptionTable* nul_chk_table,
259 AbstractCompiler* compiler,
260 int comp_level);
262 // helper methods
263 void* operator new(size_t size, int nmethod_size);
265 const char* reloc_string_for(u_char* begin, u_char* end);
266 // Returns true if this thread changed the state of the nmethod or
267 // false if another thread performed the transition.
268 bool make_not_entrant_or_zombie(unsigned int state);
269 void inc_decompile_count();
271 // Used to manipulate the exception cache
272 void add_exception_cache_entry(ExceptionCache* new_entry);
273 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
275 // Inform external interfaces that a compiled method has been unloaded
276 void post_compiled_method_unload();
278 // Initailize fields to their default values
279 void init_defaults();
281 public:
282 // create nmethod with entry_bci
283 static nmethod* new_nmethod(methodHandle method,
284 int compile_id,
285 int entry_bci,
286 CodeOffsets* offsets,
287 int orig_pc_offset,
288 DebugInformationRecorder* recorder,
289 Dependencies* dependencies,
290 CodeBuffer *code_buffer,
291 int frame_size,
292 OopMapSet* oop_maps,
293 ExceptionHandlerTable* handler_table,
294 ImplicitExceptionTable* nul_chk_table,
295 AbstractCompiler* compiler,
296 int comp_level);
298 static nmethod* new_native_nmethod(methodHandle method,
299 CodeBuffer *code_buffer,
300 int vep_offset,
301 int frame_complete,
302 int frame_size,
303 ByteSize receiver_sp_offset,
304 ByteSize basic_lock_sp_offset,
305 OopMapSet* oop_maps);
307 #ifdef HAVE_DTRACE_H
308 // The method we generate for a dtrace probe has to look
309 // like an nmethod as far as the rest of the system is concerned
310 // which is somewhat unfortunate.
311 static nmethod* new_dtrace_nmethod(methodHandle method,
312 CodeBuffer *code_buffer,
313 int vep_offset,
314 int trap_offset,
315 int frame_complete,
316 int frame_size);
318 int trap_offset() const { return _trap_offset; }
319 address trap_address() const { return insts_begin() + _trap_offset; }
321 #endif // def HAVE_DTRACE_H
323 // accessors
324 methodOop method() const { return _method; }
325 AbstractCompiler* compiler() const { return _compiler; }
327 #ifndef PRODUCT
328 bool has_debug_info() const { return _has_debug_info; }
329 void set_has_debug_info(bool f) { _has_debug_info = false; }
330 #endif // NOT PRODUCT
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() + _scopes_data_offset) ; }
356 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
357 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
358 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
359 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
360 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
361 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
362 address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
363 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
364 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
365 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
367 // Sizes
368 int consts_size () const { return consts_end () - consts_begin (); }
369 int insts_size () const { return insts_end () - insts_begin (); }
370 int stub_size () const { return stub_end () - stub_begin (); }
371 int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
372 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
373 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
374 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
375 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
376 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
378 int total_size () const;
380 // Containment
381 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
382 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
383 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
384 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
385 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
386 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
387 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
388 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
390 // entry points
391 address entry_point() const { return _entry_point; } // normal entry point
392 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
394 // flag accessing and manipulation
395 bool is_in_use() const { return _state == alive; }
396 bool is_alive() const { return _state == alive || _state == not_entrant; }
397 bool is_not_entrant() const { return _state == not_entrant; }
398 bool is_zombie() const { return _state == zombie; }
399 bool is_unloaded() const { return _state == unloaded; }
401 // Make the nmethod non entrant. The nmethod will continue to be
402 // alive. It is used when an uncommon trap happens. Returns true
403 // if this thread changed the state of the nmethod or false if
404 // another thread performed the transition.
405 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
406 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
408 // used by jvmti to track if the unload event has been reported
409 bool unload_reported() { return _unload_reported; }
410 void set_unload_reported() { _unload_reported = true; }
412 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; }
413 void mark_for_deoptimization() { _marked_for_deoptimization = true; }
415 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
417 bool has_dependencies() { return dependencies_size() != 0; }
418 void flush_dependencies(BoolObjectClosure* is_alive);
419 bool has_flushed_dependencies() { return _has_flushed_dependencies; }
420 void set_has_flushed_dependencies() {
421 assert(!has_flushed_dependencies(), "should only happen once");
422 _has_flushed_dependencies = 1;
423 }
425 bool is_marked_for_reclamation() const { return _marked_for_reclamation; }
426 void mark_for_reclamation() { _marked_for_reclamation = 1; }
428 bool has_unsafe_access() const { return _has_unsafe_access; }
429 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
431 bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
432 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
434 bool is_speculatively_disconnected() const { return _speculatively_disconnected; }
435 void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; }
437 int comp_level() const { return _comp_level; }
439 // Support for oops in scopes and relocs:
440 // Note: index 0 is reserved for null.
441 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
442 oop* oop_addr_at(int index) const { // for GC
443 // relocation indexes are biased by 1 (because 0 is reserved)
444 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
445 assert(!_oops_are_stale, "oops are stale");
446 return &oops_begin()[index - 1];
447 }
449 void copy_oops(GrowableArray<jobject>* oops);
451 // Relocation support
452 private:
453 void fix_oop_relocations(address begin, address end, bool initialize_immediates);
454 inline void initialize_immediate_oop(oop* dest, jobject handle);
456 public:
457 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
458 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
460 bool is_at_poll_return(address pc);
461 bool is_at_poll_or_poll_return(address pc);
463 // Non-perm oop support
464 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
465 protected:
466 enum { npl_on_list = 0x01, npl_marked = 0x10 };
467 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
468 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
469 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
470 #ifndef PRODUCT
471 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
472 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
473 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
474 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
475 #endif //PRODUCT
476 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
477 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
479 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
480 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
482 public:
484 // Sweeper support
485 long stack_traversal_mark() { return _stack_traversal_mark; }
486 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
488 // Exception cache support
489 ExceptionCache* exception_cache() const { return _exception_cache; }
490 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
491 address handler_for_exception_and_pc(Handle exception, address pc);
492 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
493 void remove_from_exception_cache(ExceptionCache* ec);
495 // implicit exceptions support
496 address continuation_for_implicit_exception(address pc);
498 // On-stack replacement support
499 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
500 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
501 void invalidate_osr_method();
502 nmethod* osr_link() const { return _osr_link; }
503 void set_osr_link(nmethod *n) { _osr_link = n; }
505 // tells whether frames described by this nmethod can be deoptimized
506 // note: native wrappers cannot be deoptimized.
507 bool can_be_deoptimized() const { return is_java_method(); }
509 // Inline cache support
510 void clear_inline_caches();
511 void cleanup_inline_caches();
512 bool inlinecache_check_contains(address addr) const {
513 return (addr >= code_begin() && addr < verified_entry_point());
514 }
516 // unlink and deallocate this nmethod
517 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
518 // expected to use any other private methods/data in this class.
520 protected:
521 void flush();
523 public:
524 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
525 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
526 bool is_locked_by_vm() const { return _lock_count >0; }
528 // See comment at definition of _last_seen_on_stack
529 void mark_as_seen_on_stack();
530 bool can_not_entrant_be_converted();
532 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
533 void set_method(methodOop method) { _method = method; }
535 // GC support
536 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
537 bool unloading_occurred);
538 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
539 oop* root, bool unloading_occurred);
541 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
542 OopClosure* f);
543 void oops_do(OopClosure* f) { oops_do(f, false); }
544 void oops_do(OopClosure* f, bool do_strong_roots_only);
545 bool detect_scavenge_root_oops();
546 void verify_scavenge_root_oops() PRODUCT_RETURN;
548 bool test_set_oops_do_mark();
549 static void oops_do_marking_prologue();
550 static void oops_do_marking_epilogue();
551 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
552 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
554 // ScopeDesc for an instruction
555 ScopeDesc* scope_desc_at(address pc);
557 private:
558 ScopeDesc* scope_desc_in(address begin, address end);
560 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
562 PcDesc* find_pc_desc_internal(address pc, bool approximate);
564 PcDesc* find_pc_desc(address pc, bool approximate) {
565 PcDesc* desc = _pc_desc_cache.last_pc_desc();
566 if (desc != NULL && desc->pc_offset() == pc - code_begin()) {
567 return desc;
568 }
569 return find_pc_desc_internal(pc, approximate);
570 }
572 public:
573 // ScopeDesc retrieval operation
574 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
575 // pc_desc_near returns the first PcDesc at or after the givne pc.
576 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
578 public:
579 // copying of debugging information
580 void copy_scopes_pcs(PcDesc* pcs, int count);
581 void copy_scopes_data(address buffer, int size);
583 // Deopt
584 // Return true is the PC is one would expect if the frame is being deopted.
585 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
586 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
587 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
588 // Accessor/mutator for the original pc of a frame before a frame was deopted.
589 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
590 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
592 static address get_deopt_original_pc(const frame* fr);
594 // MethodHandle
595 bool is_method_handle_return(address return_pc);
597 // jvmti support:
598 void post_compiled_method_load_event();
599 jmethodID get_and_cache_jmethod_id();
601 // verify operations
602 void verify();
603 void verify_scopes();
604 void verify_interrupt_point(address interrupt_point);
606 // print compilation helper
607 static void print_compilation(outputStream *st, const char *method_name, const char *title,
608 methodOop method, bool is_blocking, int compile_id, int bci, int comp_level);
610 // printing support
611 void print() const;
612 void print_code();
613 void print_relocations() PRODUCT_RETURN;
614 void print_pcs() PRODUCT_RETURN;
615 void print_scopes() PRODUCT_RETURN;
616 void print_dependencies() PRODUCT_RETURN;
617 void print_value_on(outputStream* st) const PRODUCT_RETURN;
618 void print_calls(outputStream* st) PRODUCT_RETURN;
619 void print_handler_table() PRODUCT_RETURN;
620 void print_nul_chk_table() PRODUCT_RETURN;
621 void print_nmethod(bool print_code);
623 // need to re-define this from CodeBlob else the overload hides it
624 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
625 void print_on(outputStream* st, const char* title) const;
627 // Logging
628 void log_identity(xmlStream* log) const;
629 void log_new_nmethod() const;
630 void log_state_change() const;
632 // Prints block-level comments, including nmethod specific block labels:
633 virtual void print_block_comment(outputStream* stream, address block_begin) {
634 print_nmethod_labels(stream, block_begin);
635 CodeBlob::print_block_comment(stream, block_begin);
636 }
637 void print_nmethod_labels(outputStream* stream, address block_begin);
639 // Prints a comment for one native instruction (reloc info, pc desc)
640 void print_code_comment_on(outputStream* st, int column, address begin, address end);
641 static void print_statistics() PRODUCT_RETURN;
643 // Compiler task identification. Note that all OSR methods
644 // are numbered in an independent sequence if CICountOSR is true,
645 // and native method wrappers are also numbered independently if
646 // CICountNative is true.
647 int compile_id() const { return _compile_id; }
648 const char* compile_kind() const;
650 // For debugging
651 // CompiledIC* IC_at(char* p) const;
652 // PrimitiveIC* primitiveIC_at(char* p) const;
653 oop embeddedOop_at(address p);
655 // tells if any of this method's dependencies have been invalidated
656 // (this is expensive!)
657 bool check_all_dependencies();
659 // tells if this compiled method is dependent on the given changes,
660 // and the changes have invalidated it
661 bool check_dependency_on(DepChange& changes);
663 // Evolution support. Tells if this compiled method is dependent on any of
664 // methods m() of class dependee, such that if m() in dependee is replaced,
665 // this compiled method will have to be deoptimized.
666 bool is_evol_dependent_on(klassOop dependee);
668 // Fast breakpoint support. Tells if this compiled method is
669 // dependent on the given method. Returns true if this nmethod
670 // corresponds to the given method as well.
671 bool is_dependent_on_method(methodOop dependee);
673 // is it ok to patch at address?
674 bool is_patchable_at(address instr_address);
676 // UseBiasedLocking support
677 ByteSize native_receiver_sp_offset() {
678 return _native_receiver_sp_offset;
679 }
680 ByteSize native_basic_lock_sp_offset() {
681 return _native_basic_lock_sp_offset;
682 }
684 // support for code generation
685 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
686 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
687 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
689 };
691 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
692 class nmethodLocker : public StackObj {
693 nmethod* _nm;
695 public:
697 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
698 static void unlock_nmethod(nmethod* nm); // (ditto)
700 nmethodLocker(address pc); // derive nm from pc
701 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
702 nmethodLocker() { _nm = NULL; }
703 ~nmethodLocker() { unlock_nmethod(_nm); }
705 nmethod* code() { return _nm; }
706 void set_code(nmethod* new_nm) {
707 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
708 _nm = new_nm;
709 lock_nmethod(_nm);
710 }
711 };
713 #endif // SHARE_VM_CODE_NMETHOD_HPP