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--- old/src/share/vm/code/nmethod.hpp
+++ new/src/share/vm/code/nmethod.hpp
1 1 /*
2 2 * Copyright 1997-2010 Sun Microsystems, Inc. All Rights Reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 21 * have any questions.
22 22 *
23 23 */
24 24
25 25 // This class is used internally by nmethods, to cache
26 26 // exception/pc/handler information.
27 27
28 28 class ExceptionCache : public CHeapObj {
29 29 friend class VMStructs;
30 30 private:
31 31 static address _unwind_handler;
32 32 enum { cache_size = 16 };
33 33 klassOop _exception_type;
34 34 address _pc[cache_size];
35 35 address _handler[cache_size];
36 36 int _count;
37 37 ExceptionCache* _next;
38 38
39 39 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
40 40 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
41 41 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
42 42 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
43 43 int count() { return _count; }
44 44 void increment_count() { _count++; }
45 45
46 46 public:
47 47
48 48 ExceptionCache(Handle exception, address pc, address handler);
49 49
50 50 klassOop exception_type() { return _exception_type; }
51 51 klassOop* exception_type_addr() { return &_exception_type; }
52 52 ExceptionCache* next() { return _next; }
53 53 void set_next(ExceptionCache *ec) { _next = ec; }
54 54
55 55 address match(Handle exception, address pc);
56 56 bool match_exception_with_space(Handle exception) ;
57 57 address test_address(address addr);
58 58 bool add_address_and_handler(address addr, address handler) ;
59 59
60 60 static address unwind_handler() { return _unwind_handler; }
61 61 };
62 62
63 63
64 64 // cache pc descs found in earlier inquiries
65 65 class PcDescCache VALUE_OBJ_CLASS_SPEC {
66 66 friend class VMStructs;
67 67 private:
68 68 enum { cache_size = 4 };
69 69 PcDesc* _last_pc_desc; // most recent pc_desc found
70 70 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found
71 71 public:
72 72 PcDescCache() { debug_only(_last_pc_desc = NULL); }
73 73 void reset_to(PcDesc* initial_pc_desc);
74 74 PcDesc* find_pc_desc(int pc_offset, bool approximate);
75 75 void add_pc_desc(PcDesc* pc_desc);
76 76 PcDesc* last_pc_desc() { return _last_pc_desc; }
77 77 };
78 78
79 79
80 80 // nmethods (native methods) are the compiled code versions of Java methods.
81 81
82 82 struct nmFlags {
83 83 friend class VMStructs;
84 84 unsigned int version:8; // version number (0 = first version)
85 85 unsigned int level:4; // optimization level
86 86 unsigned int age:4; // age (in # of sweep steps)
87 87
88 88 unsigned int state:2; // {alive, zombie, unloaded)
89 89
90 90 unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap?
91 91 unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures
92 92 unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies
93 93 unsigned int markedForReclamation:1; // Used by NMethodSweeper
94 94
95 95 unsigned int has_unsafe_access:1; // May fault due to unsafe access.
96 96 unsigned int has_method_handle_invokes:1; // Has this method MethodHandle invokes?
97 97
98 98 unsigned int speculatively_disconnected:1; // Marked for potential unload
99 99
100 100 void clear();
101 101 };
102 102
103 103
104 104 // A nmethod contains:
105 105 // - header (the nmethod structure)
106 106 // [Relocation]
107 107 // - relocation information
108 108 // - constant part (doubles, longs and floats used in nmethod)
109 109 // [Code]
110 110 // - code body
111 111 // - exception handler
112 112 // - stub code
113 113 // [Debugging information]
114 114 // - oop array
115 115 // - data array
116 116 // - pcs
117 117 // [Exception handler table]
118 118 // - handler entry point array
119 119 // [Implicit Null Pointer exception table]
120 120 // - implicit null table array
121 121
122 122 class Dependencies;
123 123 class ExceptionHandlerTable;
124 124 class ImplicitExceptionTable;
125 125 class AbstractCompiler;
126 126 class xmlStream;
127 127
128 128 class nmethod : public CodeBlob {
129 129 friend class VMStructs;
130 130 friend class NMethodSweeper;
131 131 friend class CodeCache; // non-perm oops
132 132 private:
133 133 // Shared fields for all nmethod's
134 134 static int _zombie_instruction_size;
135 135
136 136 methodOop _method;
137 137 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
138 138
139 139 // To support simple linked-list chaining of nmethods:
140 140 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
141 141 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
142 142 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
143 143
144 144 static nmethod* volatile _oops_do_mark_nmethods;
145 145 nmethod* volatile _oops_do_mark_link;
146 146
147 147 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
148 148
149 149 // Offsets for different nmethod parts
150 150 int _exception_offset;
151 151 // All deoptee's will resume execution at this location described by
152 152 // this offset.
153 153 int _deoptimize_offset;
154 154 // All deoptee's at a MethodHandle call site will resume execution
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155 155 // at this location described by this offset.
156 156 int _deoptimize_mh_offset;
157 157 // Offset of the unwind handler if it exists
158 158 int _unwind_handler_offset;
159 159
160 160 #ifdef HAVE_DTRACE_H
161 161 int _trap_offset;
162 162 #endif // def HAVE_DTRACE_H
163 163 int _stub_offset;
164 164 int _consts_offset;
165 + int _oops_offset; // offset to where embedded oop table begins (inside data)
165 166 int _scopes_data_offset;
166 167 int _scopes_pcs_offset;
167 168 int _dependencies_offset;
168 169 int _handler_table_offset;
169 170 int _nul_chk_table_offset;
170 171 int _nmethod_end_offset;
171 172
172 173 // location in frame (offset for sp) that deopt can store the original
173 174 // pc during a deopt.
174 175 int _orig_pc_offset;
175 176
176 177 int _compile_id; // which compilation made this nmethod
177 178 int _comp_level; // compilation level
178 179
179 180 // offsets for entry points
180 181 address _entry_point; // entry point with class check
181 182 address _verified_entry_point; // entry point without class check
182 183 address _osr_entry_point; // entry point for on stack replacement
183 184
184 185 nmFlags flags; // various flags to keep track of nmethod state
185 186 bool _markedForDeoptimization; // Used for stack deoptimization
186 187 enum { alive = 0,
187 188 not_entrant = 1, // uncommon trap has happened but activations may still exist
188 189 zombie = 2,
189 190 unloaded = 3 };
190 191
191 192 // used by jvmti to track if an unload event has been posted for this nmethod.
192 193 bool _unload_reported;
193 194
194 195 jbyte _scavenge_root_state;
195 196
196 197 NOT_PRODUCT(bool _has_debug_info; )
197 198
198 199 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
199 200 jint _lock_count;
200 201
201 202 // not_entrant method removal. Each mark_sweep pass will update
202 203 // this mark to current sweep invocation count if it is seen on the
203 204 // stack. An not_entrant method can be removed when there is no
204 205 // more activations, i.e., when the _stack_traversal_mark is less than
205 206 // current sweep traversal index.
206 207 long _stack_traversal_mark;
207 208
208 209 ExceptionCache *_exception_cache;
209 210 PcDescCache _pc_desc_cache;
210 211
211 212 // These are only used for compiled synchronized native methods to
212 213 // locate the owner and stack slot for the BasicLock so that we can
213 214 // properly revoke the bias of the owner if necessary. They are
214 215 // needed because there is no debug information for compiled native
215 216 // wrappers and the oop maps are insufficient to allow
216 217 // frame::retrieve_receiver() to work. Currently they are expected
217 218 // to be byte offsets from the Java stack pointer for maximum code
218 219 // sharing between platforms. Note that currently biased locking
219 220 // will never cause Class instances to be biased but this code
220 221 // handles the static synchronized case as well.
221 222 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
222 223 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
223 224
224 225 friend class nmethodLocker;
225 226
226 227 // For native wrappers
227 228 nmethod(methodOop method,
228 229 int nmethod_size,
229 230 CodeOffsets* offsets,
230 231 CodeBuffer *code_buffer,
231 232 int frame_size,
232 233 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
233 234 ByteSize basic_lock_sp_offset, /* synchronized natives only */
234 235 OopMapSet* oop_maps);
235 236
236 237 #ifdef HAVE_DTRACE_H
237 238 // For native wrappers
238 239 nmethod(methodOop method,
239 240 int nmethod_size,
240 241 CodeOffsets* offsets,
241 242 CodeBuffer *code_buffer,
242 243 int frame_size);
243 244 #endif // def HAVE_DTRACE_H
244 245
245 246 // Creation support
246 247 nmethod(methodOop method,
247 248 int nmethod_size,
248 249 int compile_id,
249 250 int entry_bci,
250 251 CodeOffsets* offsets,
251 252 int orig_pc_offset,
252 253 DebugInformationRecorder *recorder,
253 254 Dependencies* dependencies,
254 255 CodeBuffer *code_buffer,
255 256 int frame_size,
256 257 OopMapSet* oop_maps,
257 258 ExceptionHandlerTable* handler_table,
258 259 ImplicitExceptionTable* nul_chk_table,
259 260 AbstractCompiler* compiler,
260 261 int comp_level);
261 262
262 263 // helper methods
263 264 void* operator new(size_t size, int nmethod_size);
264 265
265 266 const char* reloc_string_for(u_char* begin, u_char* end);
266 267 // Returns true if this thread changed the state of the nmethod or
267 268 // false if another thread performed the transition.
268 269 bool make_not_entrant_or_zombie(unsigned int state);
269 270 void inc_decompile_count();
270 271
271 272 // used to check that writes to nmFlags are done consistently.
272 273 static void check_safepoint() PRODUCT_RETURN;
273 274
274 275 // Used to manipulate the exception cache
275 276 void add_exception_cache_entry(ExceptionCache* new_entry);
276 277 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
277 278
278 279 // Inform external interfaces that a compiled method has been unloaded
279 280 inline void post_compiled_method_unload();
280 281
281 282 public:
282 283 // create nmethod with entry_bci
283 284 static nmethod* new_nmethod(methodHandle method,
284 285 int compile_id,
285 286 int entry_bci,
286 287 CodeOffsets* offsets,
287 288 int orig_pc_offset,
288 289 DebugInformationRecorder* recorder,
289 290 Dependencies* dependencies,
290 291 CodeBuffer *code_buffer,
291 292 int frame_size,
292 293 OopMapSet* oop_maps,
293 294 ExceptionHandlerTable* handler_table,
294 295 ImplicitExceptionTable* nul_chk_table,
295 296 AbstractCompiler* compiler,
296 297 int comp_level);
297 298
298 299 static nmethod* new_native_nmethod(methodHandle method,
299 300 CodeBuffer *code_buffer,
300 301 int vep_offset,
301 302 int frame_complete,
302 303 int frame_size,
303 304 ByteSize receiver_sp_offset,
304 305 ByteSize basic_lock_sp_offset,
305 306 OopMapSet* oop_maps);
306 307
307 308 #ifdef HAVE_DTRACE_H
308 309 // The method we generate for a dtrace probe has to look
309 310 // like an nmethod as far as the rest of the system is concerned
310 311 // which is somewhat unfortunate.
311 312 static nmethod* new_dtrace_nmethod(methodHandle method,
312 313 CodeBuffer *code_buffer,
313 314 int vep_offset,
314 315 int trap_offset,
315 316 int frame_complete,
316 317 int frame_size);
317 318
318 319 int trap_offset() const { return _trap_offset; }
319 320 address trap_address() const { return code_begin() + _trap_offset; }
320 321
321 322 #endif // def HAVE_DTRACE_H
322 323
323 324 // accessors
324 325 methodOop method() const { return _method; }
325 326 AbstractCompiler* compiler() const { return _compiler; }
326 327
327 328 #ifndef PRODUCT
328 329 bool has_debug_info() const { return _has_debug_info; }
329 330 void set_has_debug_info(bool f) { _has_debug_info = false; }
330 331 #endif // NOT PRODUCT
331 332
332 333 // type info
333 334 bool is_nmethod() const { return true; }
334 335 bool is_java_method() const { return !method()->is_native(); }
335 336 bool is_native_method() const { return method()->is_native(); }
336 337 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
337 338
338 339 bool is_compiled_by_c1() const;
339 340 bool is_compiled_by_c2() const;
340 341
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341 342 // boundaries for different parts
342 343 address code_begin () const { return _entry_point; }
343 344 address code_end () const { return header_begin() + _stub_offset ; }
344 345 address exception_begin () const { return header_begin() + _exception_offset ; }
345 346 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
346 347 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
347 348 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
348 349 address stub_begin () const { return header_begin() + _stub_offset ; }
349 350 address stub_end () const { return header_begin() + _consts_offset ; }
350 351 address consts_begin () const { return header_begin() + _consts_offset ; }
351 - address consts_end () const { return header_begin() + _scopes_data_offset ; }
352 + address consts_end () const { return header_begin() + _oops_offset ; }
353 + oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
354 + oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; }
355 +
352 356 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
353 357 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
354 358 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
355 359 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
356 360 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
357 361 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
358 362 address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
359 363 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
360 364 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
361 365 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
362 366
363 - int code_size () const { return code_end () - code_begin (); }
364 - int stub_size () const { return stub_end () - stub_begin (); }
365 - int consts_size () const { return consts_end () - consts_begin (); }
366 - int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
367 - int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); }
368 - int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
369 - int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
370 - int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
367 + // Sizes
368 + int code_size () const { return code_end () - code_begin (); }
369 + int stub_size () const { return stub_end () - stub_begin (); }
370 + int consts_size () const { return consts_end () - consts_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(); }
371 377
372 378 int total_size () const;
373 379
380 + // Containment
374 381 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
375 382 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
376 383 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
384 + bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
377 385 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
378 386 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
379 387 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
380 388 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
381 389
382 390 // entry points
383 391 address entry_point() const { return _entry_point; } // normal entry point
384 392 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
385 393
386 394 // flag accessing and manipulation
387 395 bool is_in_use() const { return flags.state == alive; }
388 396 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
389 397 bool is_not_entrant() const { return flags.state == not_entrant; }
390 398 bool is_zombie() const { return flags.state == zombie; }
391 399 bool is_unloaded() const { return flags.state == unloaded; }
392 400
393 401 // Make the nmethod non entrant. The nmethod will continue to be
394 402 // alive. It is used when an uncommon trap happens. Returns true
395 403 // if this thread changed the state of the nmethod or false if
396 404 // another thread performed the transition.
397 405 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
398 406 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
399 407
400 408 // used by jvmti to track if the unload event has been reported
401 409 bool unload_reported() { return _unload_reported; }
402 410 void set_unload_reported() { _unload_reported = true; }
403 411
404 412 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; }
405 413 void mark_for_deoptimization() { _markedForDeoptimization = true; }
406 414
407 415 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
408 416
409 417 bool has_dependencies() { return dependencies_size() != 0; }
410 418 void flush_dependencies(BoolObjectClosure* is_alive);
411 419 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; }
412 420 void set_has_flushed_dependencies() {
413 421 check_safepoint();
414 422 assert(!has_flushed_dependencies(), "should only happen once");
415 423 flags.hasFlushedDependencies = 1;
416 424 }
417 425
418 426 bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
419 427 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; }
420 428 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; }
421 429
422 430 bool has_unsafe_access() const { return flags.has_unsafe_access; }
423 431 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
424 432
425 433 bool has_method_handle_invokes() const { return flags.has_method_handle_invokes; }
426 434 void set_has_method_handle_invokes(bool z) { flags.has_method_handle_invokes = z; }
427 435
428 436 bool is_speculatively_disconnected() const { return flags.speculatively_disconnected; }
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429 437 void set_speculatively_disconnected(bool z) { flags.speculatively_disconnected = z; }
430 438
431 439 int level() const { return flags.level; }
432 440 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; }
433 441
434 442 int comp_level() const { return _comp_level; }
435 443
436 444 int version() const { return flags.version; }
437 445 void set_version(int v);
438 446
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 + return &oops_begin()[index - 1];
454 + }
455 +
456 + void copy_oops(GrowableArray<jobject>* oops);
457 +
458 + // Relocation support
459 +private:
460 + void fix_oop_relocations(address begin, address end, bool initialize_immediates);
461 + inline void initialize_immediate_oop(oop* dest, jobject handle);
462 +
463 +public:
464 + void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
465 + void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
466 +
467 + bool is_at_poll_return(address pc);
468 + bool is_at_poll_or_poll_return(address pc);
469 +
439 470 // Non-perm oop support
440 471 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
441 472 protected:
442 473 enum { npl_on_list = 0x01, npl_marked = 0x10 };
443 474 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
444 475 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
445 476 // assertion-checking and pruning logic uses the bits of _scavenge_root_state
446 477 #ifndef PRODUCT
447 478 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
448 479 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
449 480 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
450 481 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
451 482 #endif //PRODUCT
452 483 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
453 484 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
454 485
455 486 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
456 487 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
457 488
458 489 public:
459 490
460 491 // Sweeper support
461 492 long stack_traversal_mark() { return _stack_traversal_mark; }
462 493 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
463 494
464 495 // Exception cache support
465 496 ExceptionCache* exception_cache() const { return _exception_cache; }
466 497 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
467 498 address handler_for_exception_and_pc(Handle exception, address pc);
468 499 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
469 500 void remove_from_exception_cache(ExceptionCache* ec);
470 501
471 502 // implicit exceptions support
472 503 address continuation_for_implicit_exception(address pc);
473 504
474 505 // On-stack replacement support
475 506 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
476 507 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
477 508 void invalidate_osr_method();
478 509 nmethod* osr_link() const { return _osr_link; }
479 510 void set_osr_link(nmethod *n) { _osr_link = n; }
480 511
481 512 // tells whether frames described by this nmethod can be deoptimized
482 513 // note: native wrappers cannot be deoptimized.
483 514 bool can_be_deoptimized() const { return is_java_method(); }
484 515
485 516 // Inline cache support
486 517 void clear_inline_caches();
487 518 void cleanup_inline_caches();
488 519 bool inlinecache_check_contains(address addr) const {
489 520 return (addr >= instructions_begin() && addr < verified_entry_point());
490 521 }
491 522
492 523 // unlink and deallocate this nmethod
493 524 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
494 525 // expected to use any other private methods/data in this class.
495 526
496 527 protected:
497 528 void flush();
498 529
499 530 public:
500 531 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
501 532 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
502 533 bool is_locked_by_vm() const { return _lock_count >0; }
503 534
504 535 // See comment at definition of _last_seen_on_stack
505 536 void mark_as_seen_on_stack();
506 537 bool can_not_entrant_be_converted();
507 538
508 539 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
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509 540 void set_method(methodOop method) { _method = method; }
510 541
511 542 // GC support
512 543 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
513 544 bool unloading_occurred);
514 545 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
515 546 oop* root, bool unloading_occurred);
516 547
517 548 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
518 549 OopClosure* f);
519 - virtual void oops_do(OopClosure* f) { oops_do(f, false); }
520 - void oops_do(OopClosure* f, bool do_strong_roots_only);
550 + void oops_do(OopClosure* f) { oops_do(f, false); }
551 + void oops_do(OopClosure* f, bool do_strong_roots_only);
521 552 bool detect_scavenge_root_oops();
522 553 void verify_scavenge_root_oops() PRODUCT_RETURN;
523 554
524 555 bool test_set_oops_do_mark();
525 556 static void oops_do_marking_prologue();
526 557 static void oops_do_marking_epilogue();
527 558 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
528 559 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
529 560
530 561 // ScopeDesc for an instruction
531 562 ScopeDesc* scope_desc_at(address pc);
532 563
533 564 private:
534 565 ScopeDesc* scope_desc_in(address begin, address end);
535 566
536 567 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
537 568
538 569 PcDesc* find_pc_desc_internal(address pc, bool approximate);
539 570
540 571 PcDesc* find_pc_desc(address pc, bool approximate) {
541 572 PcDesc* desc = _pc_desc_cache.last_pc_desc();
542 573 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
543 574 return desc;
544 575 }
545 576 return find_pc_desc_internal(pc, approximate);
546 577 }
547 578
548 579 public:
549 580 // ScopeDesc retrieval operation
550 581 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
551 582 // pc_desc_near returns the first PcDesc at or after the givne pc.
552 583 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
553 584
554 585 public:
555 586 // copying of debugging information
556 587 void copy_scopes_pcs(PcDesc* pcs, int count);
557 588 void copy_scopes_data(address buffer, int size);
558 589
559 590 // Deopt
560 591 // Return true is the PC is one would expect if the frame is being deopted.
561 592 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
562 593 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
563 594 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
564 595 // Accessor/mutator for the original pc of a frame before a frame was deopted.
565 596 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
566 597 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
567 598
568 599 static address get_deopt_original_pc(const frame* fr);
569 600
570 601 // MethodHandle
571 602 bool is_method_handle_return(address return_pc);
572 603
573 604 // jvmti support:
574 605 void post_compiled_method_load_event();
575 606
576 607 // verify operations
577 608 void verify();
578 609 void verify_scopes();
579 610 void verify_interrupt_point(address interrupt_point);
580 611
581 612 // printing support
582 613 void print() const;
583 614 void print_code();
584 615 void print_relocations() PRODUCT_RETURN;
585 616 void print_pcs() PRODUCT_RETURN;
586 617 void print_scopes() PRODUCT_RETURN;
587 618 void print_dependencies() PRODUCT_RETURN;
588 619 void print_value_on(outputStream* st) const PRODUCT_RETURN;
589 620 void print_calls(outputStream* st) PRODUCT_RETURN;
590 621 void print_handler_table() PRODUCT_RETURN;
591 622 void print_nul_chk_table() PRODUCT_RETURN;
592 623 void print_nmethod(bool print_code);
593 624
594 625 void print_on(outputStream* st, const char* title) const;
595 626
596 627 // Logging
597 628 void log_identity(xmlStream* log) const;
598 629 void log_new_nmethod() const;
599 630 void log_state_change() const;
600 631
601 632 // Prints block-level comments, including nmethod specific block labels:
602 633 virtual void print_block_comment(outputStream* stream, address block_begin) {
603 634 print_nmethod_labels(stream, block_begin);
604 635 CodeBlob::print_block_comment(stream, block_begin);
605 636 }
606 637 void print_nmethod_labels(outputStream* stream, address block_begin);
607 638
608 639 // Prints a comment for one native instruction (reloc info, pc desc)
609 640 void print_code_comment_on(outputStream* st, int column, address begin, address end);
610 641 static void print_statistics() PRODUCT_RETURN;
611 642
612 643 // Compiler task identification. Note that all OSR methods
613 644 // are numbered in an independent sequence if CICountOSR is true,
614 645 // and native method wrappers are also numbered independently if
615 646 // CICountNative is true.
616 647 int compile_id() const { return _compile_id; }
617 648 const char* compile_kind() const;
618 649
619 650 // For debugging
620 651 // CompiledIC* IC_at(char* p) const;
621 652 // PrimitiveIC* primitiveIC_at(char* p) const;
622 653 oop embeddedOop_at(address p);
623 654
624 655 // tells if any of this method's dependencies have been invalidated
625 656 // (this is expensive!)
626 657 bool check_all_dependencies();
627 658
628 659 // tells if this compiled method is dependent on the given changes,
629 660 // and the changes have invalidated it
630 661 bool check_dependency_on(DepChange& changes);
631 662
632 663 // Evolution support. Tells if this compiled method is dependent on any of
633 664 // methods m() of class dependee, such that if m() in dependee is replaced,
634 665 // this compiled method will have to be deoptimized.
635 666 bool is_evol_dependent_on(klassOop dependee);
636 667
637 668 // Fast breakpoint support. Tells if this compiled method is
638 669 // dependent on the given method. Returns true if this nmethod
639 670 // corresponds to the given method as well.
640 671 bool is_dependent_on_method(methodOop dependee);
641 672
642 673 // is it ok to patch at address?
643 674 bool is_patchable_at(address instr_address);
644 675
645 676 // UseBiasedLocking support
646 677 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
647 678 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
648 679 }
649 680 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
650 681 return _compiled_synchronized_native_basic_lock_sp_offset;
651 682 }
652 683
653 684 // support for code generation
654 685 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
655 686 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
656 687 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
657 688
658 689 };
659 690
660 691 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
661 692 class nmethodLocker : public StackObj {
662 693 nmethod* _nm;
663 694
664 695 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
665 696 static void unlock_nmethod(nmethod* nm); // (ditto)
666 697
667 698 public:
668 699 nmethodLocker(address pc); // derive nm from pc
669 700 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
670 701 nmethodLocker() { _nm = NULL; }
671 702 ~nmethodLocker() { unlock_nmethod(_nm); }
672 703
673 704 nmethod* code() { return _nm; }
674 705 void set_code(nmethod* new_nm) {
675 706 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
676 707 _nm = new_nm;
677 708 lock_nmethod(_nm);
678 709 }
679 710 };
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