131 return false;
132 }
133
134 sender_pc = (address) this->fp()[return_addr_offset];
135 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
136
137 } else {
138 // must be some sort of compiled/runtime frame
139 // fp does not have to be safe (although it could be check for c1?)
140
141 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
142 if (_cb->frame_size() <= 0) {
143 return false;
144 }
145
146 sender_sp = _unextended_sp + _cb->frame_size();
147 // On Intel the return_address is always the word on the stack
148 sender_pc = (address) *(sender_sp-1);
149 }
150
151
152 // If the potential sender is the interpreter then we can do some more checking
153 if (Interpreter::contains(sender_pc)) {
154
155 // ebp is always saved in a recognizable place in any code we generate. However
156 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
157 // is really a frame pointer.
158
159 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
160 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
161
162 if (!saved_fp_safe) {
163 return false;
164 }
165
166 // construct the potential sender
167
168 frame sender(sender_sp, saved_fp, sender_pc);
169
170 return sender.is_interpreted_frame_valid(thread);
171
172 }
173
174 // We must always be able to find a recognizable pc
175 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
176 if (sender_pc == NULL || sender_blob == NULL) {
177 return false;
178 }
179
180 // Could be a zombie method
181 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
182 return false;
183 }
184
185 // Could just be some random pointer within the codeBlob
186 if (!sender_blob->code_contains(sender_pc)) {
187 return false;
188 }
189
190 // We should never be able to see an adapter if the current frame is something from code cache
191 if (sender_blob->is_adapter_blob()) {
192 return false;
193 }
194
195 // Could be the call_stub
196 if (StubRoutines::returns_to_call_stub(sender_pc)) {
197 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
198 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
199
200 if (!saved_fp_safe) {
201 return false;
202 }
203
204 // construct the potential sender
205
206 frame sender(sender_sp, saved_fp, sender_pc);
207
208 // Validate the JavaCallWrapper an entry frame must have
209 address jcw = (address)sender.entry_frame_call_wrapper();
210
211 bool jcw_safe = (jcw < thread->stack_base()) && ( jcw > (address)sender.fp());
212
213 return jcw_safe;
214 }
215
216 if (sender_blob->is_nmethod()) {
217 nmethod* nm = sender_blob->as_nmethod_or_null();
218 if (nm != NULL) {
219 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
220 nm->method()->is_method_handle_intrinsic()) {
221 return false;
222 }
223 }
224 }
225
226 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
257 }
258
259 // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
260
261 if ( (address) this->fp()[return_addr_offset] == NULL) return false;
262
263
264 // could try and do some more potential verification of native frame if we could think of some...
265
266 return true;
267
268 }
269
270
271 void frame::patch_pc(Thread* thread, address pc) {
272 address* pc_addr = &(((address*) sp())[-1]);
273 if (TracePcPatching) {
274 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
275 pc_addr, *pc_addr, pc);
276 }
277 // Either the return address is the original one or we are going to
278 // patch in the same address that's already there.
279 assert(_pc == *pc_addr || pc == *pc_addr, "must be");
280 *pc_addr = pc;
281 _cb = CodeCache::find_blob(pc);
282 address original_pc = nmethod::get_deopt_original_pc(this);
283 if (original_pc != NULL) {
284 assert(original_pc == _pc, "expected original PC to be stored before patching");
285 _deopt_state = is_deoptimized;
286 // leave _pc as is
287 } else {
288 _deopt_state = not_deoptimized;
289 _pc = pc;
290 }
291 }
292
293 bool frame::is_interpreted_frame() const {
294 return Interpreter::contains(pc());
295 }
296
356 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
357 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
358 }
359
360 // Used by template based interpreter deoptimization
361 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
362 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
363 }
364 #endif // CC_INTERP
365
366 frame frame::sender_for_entry_frame(RegisterMap* map) const {
367 assert(map != NULL, "map must be set");
368 // Java frame called from C; skip all C frames and return top C
369 // frame of that chunk as the sender
370 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
371 assert(!entry_frame_is_first(), "next Java fp must be non zero");
372 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
373 map->clear();
374 assert(map->include_argument_oops(), "should be set by clear");
375 if (jfa->last_Java_pc() != NULL ) {
376 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
377 return fr;
378 }
379 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp());
380 return fr;
381 }
382
383 //------------------------------------------------------------------------------
384 // frame::verify_deopt_original_pc
385 //
386 // Verifies the calculated original PC of a deoptimization PC for the
387 // given unextended SP.
388 #ifdef ASSERT
389 void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp) {
390 frame fr;
391
392 // This is ugly but it's better than to change {get,set}_original_pc
393 // to take an SP value as argument. And it's only a debugging
394 // method anyway.
395 fr._unextended_sp = unextended_sp;
396
397 address original_pc = nm->get_original_pc(&fr);
398 assert(nm->insts_contains(original_pc), "original PC must be in nmethod");
399 }
439 #endif // AMD64
440 }
441
442
443 //------------------------------------------------------------------------------
444 // frame::sender_for_interpreter_frame
445 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
446 // SP is the raw SP from the sender after adapter or interpreter
447 // extension.
448 intptr_t* sender_sp = this->sender_sp();
449
450 // This is the sp before any possible extension (adapter/locals).
451 intptr_t* unextended_sp = interpreter_frame_sender_sp();
452
453 #ifdef COMPILER2
454 if (map->update_map()) {
455 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
456 }
457 #endif // COMPILER2
458
459 return frame(sender_sp, unextended_sp, link(), sender_pc());
460 }
461
462
463 //------------------------------------------------------------------------------
464 // frame::sender_for_compiled_frame
465 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
466 assert(map != NULL, "map must be set");
467
468 // frame owned by optimizing compiler
469 assert(_cb->frame_size() >= 0, "must have non-zero frame size");
470 intptr_t* sender_sp = unextended_sp() + _cb->frame_size();
471 intptr_t* unextended_sp = sender_sp;
472
473 // On Intel the return_address is always the word on the stack
474 address sender_pc = (address) *(sender_sp-1);
475
476 // This is the saved value of EBP which may or may not really be an FP.
477 // It is only an FP if the sender is an interpreter frame (or C1?).
478 intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
479
480 if (map->update_map()) {
481 // Tell GC to use argument oopmaps for some runtime stubs that need it.
482 // For C1, the runtime stub might not have oop maps, so set this flag
483 // outside of update_register_map.
484 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
485 if (_cb->oop_maps() != NULL) {
486 OopMapSet::update_register_map(this, map);
487 }
488
489 // Since the prolog does the save and restore of EBP there is no oopmap
490 // for it so we must fill in its location as if there was an oopmap entry
491 // since if our caller was compiled code there could be live jvm state in it.
492 update_map_with_saved_link(map, saved_fp_addr);
493 }
494
495 assert(sender_sp != sp(), "must have changed");
496 return frame(sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
497 }
498
499
500 //------------------------------------------------------------------------------
501 // frame::sender
502 frame frame::sender(RegisterMap* map) const {
503 // Default is we done have to follow them. The sender_for_xxx will
504 // update it accordingly
505 map->set_include_argument_oops(false);
506
507 if (is_entry_frame()) return sender_for_entry_frame(map);
508 if (is_interpreted_frame()) return sender_for_interpreter_frame(map);
509 assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
510
511 if (_cb != NULL) {
512 return sender_for_compiled_frame(map);
513 }
514 // Must be native-compiled frame, i.e. the marshaling code for native
515 // methods that exists in the core system.
516 return frame(sender_sp(), link(), sender_pc());
517 }
518
519
520 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) {
521 assert(is_interpreted_frame(), "must be interpreter frame");
522 Method* method = interpreter_frame_method();
523 // When unpacking an optimized frame the frame pointer is
524 // adjusted with:
525 int diff = (method->max_locals() - method->size_of_parameters()) *
526 Interpreter::stackElementWords;
527 return _fp == (fp - diff);
528 }
529
530 void frame::pd_gc_epilog() {
531 // nothing done here now
532 }
533
534 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
535 // QQQ
536 #ifdef CC_INTERP
693 intptr_t *frame::initial_deoptimization_info() {
694 // used to reset the saved FP
695 return fp();
696 }
697
698 intptr_t* frame::real_fp() const {
699 if (_cb != NULL) {
700 // use the frame size if valid
701 int size = _cb->frame_size();
702 if (size > 0) {
703 return unextended_sp() + size;
704 }
705 }
706 // else rely on fp()
707 assert(! is_compiled_frame(), "unknown compiled frame size");
708 return fp();
709 }
710
711 #ifndef PRODUCT
712 // This is a generic constructor which is only used by pns() in debug.cpp.
713 frame::frame(void* sp, void* fp, void* pc) {
714 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
715 }
716 #endif
|
131 return false;
132 }
133
134 sender_pc = (address) this->fp()[return_addr_offset];
135 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
136
137 } else {
138 // must be some sort of compiled/runtime frame
139 // fp does not have to be safe (although it could be check for c1?)
140
141 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
142 if (_cb->frame_size() <= 0) {
143 return false;
144 }
145
146 sender_sp = _unextended_sp + _cb->frame_size();
147 // On Intel the return_address is always the word on the stack
148 sender_pc = (address) *(sender_sp-1);
149 }
150
151 if (SharedRuntime::is_memento_stack_trace_return_handler(sender_pc)) {
152 sender_pc = thread->memento_original_return_address();
153 }
154
155
156 // If the potential sender is the interpreter then we can do some more checking
157 if (Interpreter::contains(sender_pc)) {
158
159 // ebp is always saved in a recognizable place in any code we generate. However
160 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
161 // is really a frame pointer.
162
163 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
164 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
165
166 if (!saved_fp_safe) {
167 return false;
168 }
169
170 // construct the potential sender
171
172 frame sender(thread, sender_sp, saved_fp, sender_pc);
173
174 return sender.is_interpreted_frame_valid(thread);
175
176 }
177
178 // We must always be able to find a recognizable pc
179 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
180 if (sender_pc == NULL || sender_blob == NULL) {
181 return false;
182 }
183
184 // Could be a zombie method
185 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
186 return false;
187 }
188
189 // Could just be some random pointer within the codeBlob
190 if (!sender_blob->code_contains(sender_pc)) {
191 return false;
192 }
193
194 // We should never be able to see an adapter if the current frame is something from code cache
195 if (sender_blob->is_adapter_blob()) {
196 return false;
197 }
198
199 // Could be the call_stub
200 if (StubRoutines::returns_to_call_stub(sender_pc)) {
201 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
202 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
203
204 if (!saved_fp_safe) {
205 return false;
206 }
207
208 // construct the potential sender
209
210 frame sender(thread, sender_sp, saved_fp, sender_pc);
211
212 // Validate the JavaCallWrapper an entry frame must have
213 address jcw = (address)sender.entry_frame_call_wrapper();
214
215 bool jcw_safe = (jcw < thread->stack_base()) && ( jcw > (address)sender.fp());
216
217 return jcw_safe;
218 }
219
220 if (sender_blob->is_nmethod()) {
221 nmethod* nm = sender_blob->as_nmethod_or_null();
222 if (nm != NULL) {
223 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
224 nm->method()->is_method_handle_intrinsic()) {
225 return false;
226 }
227 }
228 }
229
230 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
261 }
262
263 // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
264
265 if ( (address) this->fp()[return_addr_offset] == NULL) return false;
266
267
268 // could try and do some more potential verification of native frame if we could think of some...
269
270 return true;
271
272 }
273
274
275 void frame::patch_pc(Thread* thread, address pc) {
276 address* pc_addr = &(((address*) sp())[-1]);
277 if (TracePcPatching) {
278 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
279 pc_addr, *pc_addr, pc);
280 }
281 assert(!SharedRuntime::is_memento_stack_trace_return_handler(pc), "new return address must not be memento return handler");
282 if (SharedRuntime::is_memento_stack_trace_return_handler(*pc_addr)) {
283 pc_addr = &(thread->memento_original_return_address());
284 assert(*pc_addr != NULL, "memento original return address must be set");
285 }
286 // Either the return address is the original one or we are going to
287 // patch in the same address that's already there.
288 assert(_pc == *pc_addr || pc == *pc_addr, "must be");
289 *pc_addr = pc;
290 _cb = CodeCache::find_blob(pc);
291 address original_pc = nmethod::get_deopt_original_pc(this);
292 if (original_pc != NULL) {
293 assert(original_pc == _pc, "expected original PC to be stored before patching");
294 _deopt_state = is_deoptimized;
295 // leave _pc as is
296 } else {
297 _deopt_state = not_deoptimized;
298 _pc = pc;
299 }
300 }
301
302 bool frame::is_interpreted_frame() const {
303 return Interpreter::contains(pc());
304 }
305
365 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
366 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
367 }
368
369 // Used by template based interpreter deoptimization
370 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
371 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
372 }
373 #endif // CC_INTERP
374
375 frame frame::sender_for_entry_frame(RegisterMap* map) const {
376 assert(map != NULL, "map must be set");
377 // Java frame called from C; skip all C frames and return top C
378 // frame of that chunk as the sender
379 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
380 assert(!entry_frame_is_first(), "next Java fp must be non zero");
381 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
382 map->clear();
383 assert(map->include_argument_oops(), "should be set by clear");
384 if (jfa->last_Java_pc() != NULL ) {
385 frame fr(map->thread(), jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
386 return fr;
387 }
388 frame fr(map->thread(), jfa->last_Java_sp(), jfa->last_Java_fp());
389 return fr;
390 }
391
392 //------------------------------------------------------------------------------
393 // frame::verify_deopt_original_pc
394 //
395 // Verifies the calculated original PC of a deoptimization PC for the
396 // given unextended SP.
397 #ifdef ASSERT
398 void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp) {
399 frame fr;
400
401 // This is ugly but it's better than to change {get,set}_original_pc
402 // to take an SP value as argument. And it's only a debugging
403 // method anyway.
404 fr._unextended_sp = unextended_sp;
405
406 address original_pc = nm->get_original_pc(&fr);
407 assert(nm->insts_contains(original_pc), "original PC must be in nmethod");
408 }
448 #endif // AMD64
449 }
450
451
452 //------------------------------------------------------------------------------
453 // frame::sender_for_interpreter_frame
454 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
455 // SP is the raw SP from the sender after adapter or interpreter
456 // extension.
457 intptr_t* sender_sp = this->sender_sp();
458
459 // This is the sp before any possible extension (adapter/locals).
460 intptr_t* unextended_sp = interpreter_frame_sender_sp();
461
462 #ifdef COMPILER2
463 if (map->update_map()) {
464 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
465 }
466 #endif // COMPILER2
467
468 return frame(map->thread(), sender_sp, unextended_sp, link(), sender_pc());
469 }
470
471
472 //------------------------------------------------------------------------------
473 // frame::sender_for_compiled_frame
474 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
475 assert(map != NULL, "map must be set");
476
477 // frame owned by optimizing compiler
478 assert(_cb->frame_size() >= 0, "must have non-zero frame size");
479 intptr_t* sender_sp = unextended_sp() + _cb->frame_size();
480 intptr_t* unextended_sp = sender_sp;
481
482 // On Intel the return_address is always the word on the stack
483 address sender_pc = (address) *(sender_sp-1);
484
485 // This is the saved value of EBP which may or may not really be an FP.
486 // It is only an FP if the sender is an interpreter frame (or C1?).
487 intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
488
489 if (map->update_map()) {
490 // Tell GC to use argument oopmaps for some runtime stubs that need it.
491 // For C1, the runtime stub might not have oop maps, so set this flag
492 // outside of update_register_map.
493 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
494 if (_cb->oop_maps() != NULL) {
495 OopMapSet::update_register_map(this, map);
496 }
497
498 // Since the prolog does the save and restore of EBP there is no oopmap
499 // for it so we must fill in its location as if there was an oopmap entry
500 // since if our caller was compiled code there could be live jvm state in it.
501 update_map_with_saved_link(map, saved_fp_addr);
502 }
503
504 assert(sender_sp != sp(), "must have changed");
505 return frame(map->thread(), sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
506 }
507
508
509 //------------------------------------------------------------------------------
510 // frame::sender
511 frame frame::sender(RegisterMap* map) const {
512 // Default is we done have to follow them. The sender_for_xxx will
513 // update it accordingly
514 map->set_include_argument_oops(false);
515
516 if (is_entry_frame()) return sender_for_entry_frame(map);
517 if (is_interpreted_frame()) return sender_for_interpreter_frame(map);
518 assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
519
520 if (_cb != NULL) {
521 return sender_for_compiled_frame(map);
522 }
523 // Must be native-compiled frame, i.e. the marshaling code for native
524 // methods that exists in the core system.
525 return frame(map->thread(), sender_sp(), link(), sender_pc());
526 }
527
528
529 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) {
530 assert(is_interpreted_frame(), "must be interpreter frame");
531 Method* method = interpreter_frame_method();
532 // When unpacking an optimized frame the frame pointer is
533 // adjusted with:
534 int diff = (method->max_locals() - method->size_of_parameters()) *
535 Interpreter::stackElementWords;
536 return _fp == (fp - diff);
537 }
538
539 void frame::pd_gc_epilog() {
540 // nothing done here now
541 }
542
543 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
544 // QQQ
545 #ifdef CC_INTERP
702 intptr_t *frame::initial_deoptimization_info() {
703 // used to reset the saved FP
704 return fp();
705 }
706
707 intptr_t* frame::real_fp() const {
708 if (_cb != NULL) {
709 // use the frame size if valid
710 int size = _cb->frame_size();
711 if (size > 0) {
712 return unextended_sp() + size;
713 }
714 }
715 // else rely on fp()
716 assert(! is_compiled_frame(), "unknown compiled frame size");
717 return fp();
718 }
719
720 #ifndef PRODUCT
721 // This is a generic constructor which is only used by pns() in debug.cpp.
722 frame::frame(Thread* thread, void* sp, void* fp, void* pc) {
723 init(thread, (intptr_t*)sp, (intptr_t*)fp, (address)pc);
724 }
725 #endif
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