1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "memory/resourceArea.hpp"
29 #include "oops/markOop.hpp"
30 #include "oops/method.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "prims/methodHandles.hpp"
33 #include "runtime/frame.inline.hpp"
34 #include "runtime/handles.inline.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/monitorChunk.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/signature.hpp"
39 #include "runtime/stubCodeGenerator.hpp"
40 #include "runtime/stubRoutines.hpp"
41 #include "vmreg_aarch64.inline.hpp"
42 #ifdef COMPILER1
43 #include "c1/c1_Runtime1.hpp"
44 #include "runtime/vframeArray.hpp"
45 #endif
46
47 #ifdef ASSERT
48 void RegisterMap::check_location_valid() {
49 }
50 #endif
51
52
53 // Profiling/safepoint support
54
55 bool frame::safe_for_sender(JavaThread *thread) {
56 address sp = (address)_sp;
57 address fp = (address)_fp;
58 address unextended_sp = (address)_unextended_sp;
59
60 // consider stack guards when trying to determine "safe" stack pointers
61 static size_t stack_guard_size = os::uses_stack_guard_pages() ?
62 (JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_zone_size()) : 0;
63 size_t usable_stack_size = thread->stack_size() - stack_guard_size;
64
65 // sp must be within the usable part of the stack (not in guards)
66 bool sp_safe = (sp < thread->stack_base()) &&
67 (sp >= thread->stack_base() - usable_stack_size);
68
69
70 if (!sp_safe) {
71 return false;
72 }
73
74 // unextended sp must be within the stack and above or equal sp
75 bool unextended_sp_safe = (unextended_sp < thread->stack_base()) &&
76 (unextended_sp >= sp);
77
78 if (!unextended_sp_safe) {
79 return false;
80 }
81
82 // an fp must be within the stack and above (but not equal) sp
83 // second evaluation on fp+ is added to handle situation where fp is -1
84 bool fp_safe = (fp < thread->stack_base() && (fp > sp) && (((fp + (return_addr_offset * sizeof(void*))) < thread->stack_base())));
85
86 // We know sp/unextended_sp are safe only fp is questionable here
87
88 // If the current frame is known to the code cache then we can attempt to
89 // to construct the sender and do some validation of it. This goes a long way
90 // toward eliminating issues when we get in frame construction code
91
92 if (_cb != NULL ) {
93
94 // First check if frame is complete and tester is reliable
95 // Unfortunately we can only check frame complete for runtime stubs and nmethod
96 // other generic buffer blobs are more problematic so we just assume they are
97 // ok. adapter blobs never have a frame complete and are never ok.
98
99 if (!_cb->is_frame_complete_at(_pc)) {
100 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
101 return false;
102 }
103 }
104
105 // Could just be some random pointer within the codeBlob
106 if (!_cb->code_contains(_pc)) {
107 return false;
108 }
109
110 // Entry frame checks
111 if (is_entry_frame()) {
112 // an entry frame must have a valid fp.
113 return fp_safe && is_entry_frame_valid(thread);
114 }
115
116 intptr_t* sender_sp = NULL;
117 intptr_t* sender_unextended_sp = NULL;
118 address sender_pc = NULL;
119 intptr_t* saved_fp = NULL;
120
121 if (is_interpreted_frame()) {
122 // fp must be safe
123 if (!fp_safe) {
124 return false;
125 }
126
127 sender_pc = (address) this->fp()[return_addr_offset];
128 // for interpreted frames, the value below is the sender "raw" sp,
129 // which can be different from the sender unextended sp (the sp seen
130 // by the sender) because of current frame local variables
131 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
132 sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
133 saved_fp = (intptr_t*) this->fp()[link_offset];
134
135 } else {
136 // must be some sort of compiled/runtime frame
137 // fp does not have to be safe (although it could be check for c1?)
138
139 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
140 if (_cb->frame_size() <= 0) {
141 return false;
142 }
143
144 sender_sp = _unextended_sp + _cb->frame_size();
145 // Is sender_sp safe?
146 if ((address)sender_sp >= thread->stack_base()) {
147 return false;
148 }
149 sender_unextended_sp = sender_sp;
150 sender_pc = (address) *(sender_sp-1);
151 // Note: frame::sender_sp_offset is only valid for compiled frame
152 saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset);
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 // fp 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 fp
161 // is really a frame pointer.
162
163 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
164
165 if (!saved_fp_safe) {
166 return false;
167 }
168
169 // construct the potential sender
170
171 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
172
173 return sender.is_interpreted_frame_valid(thread);
174
175 }
176
177 // We must always be able to find a recognizable pc
178 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
179 if (sender_pc == NULL || sender_blob == NULL) {
180 return false;
181 }
182
183 // Could be a zombie method
184 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
185 return false;
186 }
187
188 // Could just be some random pointer within the codeBlob
189 if (!sender_blob->code_contains(sender_pc)) {
190 return false;
191 }
192
193 // We should never be able to see an adapter if the current frame is something from code cache
194 if (sender_blob->is_adapter_blob()) {
195 return false;
196 }
197
198 // Could be the call_stub
199 if (StubRoutines::returns_to_call_stub(sender_pc)) {
200 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
201
202 if (!saved_fp_safe) {
203 return false;
204 }
205
206 // construct the potential sender
207
208 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
209
210 // Validate the JavaCallWrapper an entry frame must have
211 address jcw = (address)sender.entry_frame_call_wrapper();
212
213 bool jcw_safe = (jcw < thread->stack_base()) && (jcw > (address)sender.fp());
214
215 return jcw_safe;
216 }
217
218 CompiledMethod* nm = sender_blob->as_compiled_method_or_null();
219 if (nm != NULL) {
220 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
221 nm->method()->is_method_handle_intrinsic()) {
222 return false;
223 }
224 }
225
226 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
227 // because the return address counts against the callee's frame.
228
229 if (sender_blob->frame_size() <= 0) {
230 assert(!sender_blob->is_compiled(), "should count return address at least");
231 return false;
232 }
233
234 // We should never be able to see anything here except an nmethod. If something in the
235 // code cache (current frame) is called by an entity within the code cache that entity
236 // should not be anything but the call stub (already covered), the interpreter (already covered)
237 // or an nmethod.
238
239 if (!sender_blob->is_compiled()) {
240 return false;
241 }
242
243 // Could put some more validation for the potential non-interpreted sender
244 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
245
246 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
247
248 // We've validated the potential sender that would be created
249 return true;
250 }
251
252 // Must be native-compiled frame. Since sender will try and use fp to find
253 // linkages it must be safe
254
255 if (!fp_safe) {
256 return false;
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 void frame::patch_pc(Thread* thread, address pc) {
271 address* pc_addr = &(((address*) sp())[-1]);
272 if (TracePcPatching) {
273 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
274 p2i(pc_addr), p2i(*pc_addr), p2i(pc));
275 }
276 // Either the return address is the original one or we are going to
277 // patch in the same address that's already there.
278 assert(_pc == *pc_addr || pc == *pc_addr, "must be");
279 *pc_addr = pc;
280 _cb = CodeCache::find_blob(pc);
281 address original_pc = CompiledMethod::get_deopt_original_pc(this);
282 if (original_pc != NULL) {
283 assert(original_pc == _pc, "expected original PC to be stored before patching");
284 _deopt_state = is_deoptimized;
285 // leave _pc as is
286 } else {
287 _deopt_state = not_deoptimized;
288 _pc = pc;
289 }
290 }
291
292 bool frame::is_interpreted_frame() const {
293 return Interpreter::contains(pc());
294 }
295
296 int frame::frame_size(RegisterMap* map) const {
297 frame sender = this->sender(map);
298 return sender.sp() - sp();
299 }
300
301 intptr_t* frame::entry_frame_argument_at(int offset) const {
302 // convert offset to index to deal with tsi
303 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
304 // Entry frame's arguments are always in relation to unextended_sp()
305 return &unextended_sp()[index];
306 }
307
308 // sender_sp
309 intptr_t* frame::interpreter_frame_sender_sp() const {
310 assert(is_interpreted_frame(), "interpreted frame expected");
311 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
312 }
313
314 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
315 assert(is_interpreted_frame(), "interpreted frame expected");
316 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
317 }
318
319
320 // monitor elements
321
322 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
323 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
324 }
325
326 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
327 BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
328 // make sure the pointer points inside the frame
329 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
330 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer");
331 return result;
332 }
333
334 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
335 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
336 }
337
338 // Used by template based interpreter deoptimization
339 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
340 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
341 }
342
343 frame frame::sender_for_entry_frame(RegisterMap* map) const {
344 assert(map != NULL, "map must be set");
345 // Java frame called from C; skip all C frames and return top C
346 // frame of that chunk as the sender
347 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
348 assert(!entry_frame_is_first(), "next Java fp must be non zero");
349 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
350 // Since we are walking the stack now this nested anchor is obviously walkable
351 // even if it wasn't when it was stacked.
352 if (!jfa->walkable()) {
353 // Capture _last_Java_pc (if needed) and mark anchor walkable.
354 jfa->capture_last_Java_pc();
355 }
356 map->clear();
357 assert(map->include_argument_oops(), "should be set by clear");
358 vmassert(jfa->last_Java_pc() != NULL, "not walkable");
359 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
360 return fr;
361 }
362
363 //------------------------------------------------------------------------------
364 // frame::verify_deopt_original_pc
365 //
366 // Verifies the calculated original PC of a deoptimization PC for the
367 // given unextended SP.
368 #ifdef ASSERT
369 void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) {
370 frame fr;
371
372 // This is ugly but it's better than to change {get,set}_original_pc
373 // to take an SP value as argument. And it's only a debugging
374 // method anyway.
375 fr._unextended_sp = unextended_sp;
376
377 address original_pc = nm->get_original_pc(&fr);
378 assert(nm->insts_contains(original_pc), "original PC must be in nmethod");
379 }
380 #endif
381
382 //------------------------------------------------------------------------------
383 // frame::adjust_unextended_sp
384 void frame::adjust_unextended_sp() {
385 // On aarch64, sites calling method handle intrinsics and lambda forms are treated
386 // as any other call site. Therefore, no special action is needed when we are
387 // returning to any of these call sites.
388
389 if (_cb != NULL) {
390 CompiledMethod* sender_cm = _cb->as_compiled_method_or_null();
391 if (sender_cm != NULL) {
392 // If the sender PC is a deoptimization point, get the original PC.
393 if (sender_cm->is_deopt_entry(_pc) ||
394 sender_cm->is_deopt_mh_entry(_pc)) {
395 DEBUG_ONLY(verify_deopt_original_pc(sender_cm, _unextended_sp));
396 }
397 }
398 }
399 }
400
401 //------------------------------------------------------------------------------
402 // frame::update_map_with_saved_link
403 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
404 // The interpreter and compiler(s) always save fp in a known
405 // location on entry. We must record where that location is
406 // so that if fp was live on callout from c2 we can find
407 // the saved copy no matter what it called.
408
409 // Since the interpreter always saves fp if we record where it is then
410 // we don't have to always save fp on entry and exit to c2 compiled
411 // code, on entry will be enough.
412 map->set_location(rfp->as_VMReg(), (address) link_addr);
413 // this is weird "H" ought to be at a higher address however the
414 // oopMaps seems to have the "H" regs at the same address and the
415 // vanilla register.
416 // XXXX make this go away
417 if (true) {
418 map->set_location(rfp->as_VMReg()->next(), (address) link_addr);
419 }
420 }
421
422
423 //------------------------------------------------------------------------------
424 // frame::sender_for_interpreter_frame
425 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
426 // SP is the raw SP from the sender after adapter or interpreter
427 // extension.
428 intptr_t* sender_sp = this->sender_sp();
429
430 // This is the sp before any possible extension (adapter/locals).
431 intptr_t* unextended_sp = interpreter_frame_sender_sp();
432
433 #if defined(COMPILER2) || INCLUDE_JVMCI
434 if (map->update_map()) {
435 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
436 }
437 #endif // COMPILER2 || INCLUDE_JVMCI
438
439 return frame(sender_sp, unextended_sp, link(), sender_pc());
440 }
441
442
443 //------------------------------------------------------------------------------
444 // frame::sender_for_compiled_frame
445 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
446 // we cannot rely upon the last fp having been saved to the thread
447 // in C2 code but it will have been pushed onto the stack. so we
448 // have to find it relative to the unextended sp
449
450 assert(_cb->frame_size() >= 0, "must have non-zero frame size");
451 intptr_t* l_sender_sp = unextended_sp() + _cb->frame_size();
452 intptr_t* unextended_sp = l_sender_sp;
453
454 // the return_address is always the word on the stack
455 address sender_pc = (address) *(l_sender_sp-1);
456
457 intptr_t** saved_fp_addr = (intptr_t**) (l_sender_sp - frame::sender_sp_offset);
458
459 // assert (sender_sp() == l_sender_sp, "should be");
460 // assert (*saved_fp_addr == link(), "should be");
461
462 if (map->update_map()) {
463 // Tell GC to use argument oopmaps for some runtime stubs that need it.
464 // For C1, the runtime stub might not have oop maps, so set this flag
465 // outside of update_register_map.
466 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
467 if (_cb->oop_maps() != NULL) {
468 OopMapSet::update_register_map(this, map);
469 }
470
471 // Since the prolog does the save and restore of FP there is no
472 // oopmap for it so we must fill in its location as if there was
473 // an oopmap entry since if our caller was compiled code there
474 // could be live jvm state in it.
475 update_map_with_saved_link(map, saved_fp_addr);
476 }
477
478 return frame(l_sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
479 }
480
481 //------------------------------------------------------------------------------
482 // frame::sender
483 frame frame::sender(RegisterMap* map) const {
484 // Default is we done have to follow them. The sender_for_xxx will
485 // update it accordingly
486 map->set_include_argument_oops(false);
487
488 if (is_entry_frame())
489 return sender_for_entry_frame(map);
490 if (is_interpreted_frame())
491 return sender_for_interpreter_frame(map);
492 assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
493
494 // This test looks odd: why is it not is_compiled_frame() ? That's
495 // because stubs also have OOP maps.
496 if (_cb != NULL) {
497 return sender_for_compiled_frame(map);
498 }
499
500 // Must be native-compiled frame, i.e. the marshaling code for native
501 // methods that exists in the core system.
502 return frame(sender_sp(), link(), sender_pc());
503 }
504
505 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
506 assert(is_interpreted_frame(), "Not an interpreted frame");
507 // These are reasonable sanity checks
508 if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
509 return false;
510 }
511 if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
512 return false;
513 }
514 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
515 return false;
516 }
517 // These are hacks to keep us out of trouble.
518 // The problem with these is that they mask other problems
519 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
520 return false;
521 }
522
523 // do some validation of frame elements
524
525 // first the method
526
527 Method* m = *interpreter_frame_method_addr();
528
529 // validate the method we'd find in this potential sender
530 if (!m->is_valid_method()) return false;
531
532 // stack frames shouldn't be much larger than max_stack elements
533 // this test requires the use of unextended_sp which is the sp as seen by
534 // the current frame, and not sp which is the "raw" pc which could point
535 // further because of local variables of the callee method inserted after
536 // method arguments
537 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
538 return false;
539 }
540
541 // validate bci/bcx
542
543 address bcp = interpreter_frame_bcp();
544 if (m->validate_bci_from_bcp(bcp) < 0) {
545 return false;
546 }
547
548 // validate constantPoolCache*
549 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
550 if (cp == NULL || !cp->is_metaspace_object()) return false;
551
552 // validate locals
553
554 address locals = (address) *interpreter_frame_locals_addr();
555
556 if (locals > thread->stack_base() || locals < (address) fp()) return false;
557
558 // We'd have to be pretty unlucky to be mislead at this point
559 return true;
560 }
561
562 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
563 assert(is_interpreted_frame(), "interpreted frame expected");
564 Method* method = interpreter_frame_method();
565 BasicType type = method->result_type();
566
567 intptr_t* tos_addr;
568 if (method->is_native()) {
569 // TODO : ensure AARCH64 does the same as Intel here i.e. push v0 then r0
570 // Prior to calling into the runtime to report the method_exit the possible
571 // return value is pushed to the native stack. If the result is a jfloat/jdouble
572 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
573 tos_addr = (intptr_t*)sp();
574 if (type == T_FLOAT || type == T_DOUBLE) {
575 // This is times two because we do a push(ltos) after pushing XMM0
576 // and that takes two interpreter stack slots.
577 tos_addr += 2 * Interpreter::stackElementWords;
578 }
579 } else {
580 tos_addr = (intptr_t*)interpreter_frame_tos_address();
581 }
582
583 switch (type) {
584 case T_OBJECT :
585 case T_ARRAY : {
586 oop obj;
587 if (method->is_native()) {
588 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
589 } else {
590 oop* obj_p = (oop*)tos_addr;
591 obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
592 }
593 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
594 *oop_result = obj;
595 break;
596 }
597 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
598 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
599 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
600 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
601 case T_INT : value_result->i = *(jint*)tos_addr; break;
602 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
603 case T_FLOAT : {
604 value_result->f = *(jfloat*)tos_addr;
605 break;
606 }
607 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
608 case T_VOID : /* Nothing to do */ break;
609 default : ShouldNotReachHere();
610 }
611
612 return type;
613 }
614
615
616 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
617 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
618 return &interpreter_frame_tos_address()[index];
619 }
620
621 #ifndef PRODUCT
622
623 #define DESCRIBE_FP_OFFSET(name) \
624 values.describe(frame_no, fp() + frame::name##_offset, #name)
625
626 void frame::describe_pd(FrameValues& values, int frame_no) {
627 if (is_interpreted_frame()) {
628 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
629 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
630 DESCRIBE_FP_OFFSET(interpreter_frame_method);
631 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
632 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
633 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
634 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
635 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
636 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
637 }
638 }
639 #endif
640
641 intptr_t *frame::initial_deoptimization_info() {
642 // Not used on aarch64, but we must return something.
643 return NULL;
644 }
645
646 intptr_t* frame::real_fp() const {
647 if (_cb != NULL) {
648 // use the frame size if valid
649 int size = _cb->frame_size();
650 if (size > 0) {
651 return unextended_sp() + size;
652 }
653 }
654 // else rely on fp()
655 assert(! is_compiled_frame(), "unknown compiled frame size");
656 return fp();
657 }
658
659 #undef DESCRIBE_FP_OFFSET
660
661 #define DESCRIBE_FP_OFFSET(name) \
662 { \
663 unsigned long *p = (unsigned long *)fp; \
664 printf("0x%016lx 0x%016lx %s\n", (unsigned long)(p + frame::name##_offset), \
665 p[frame::name##_offset], #name); \
666 }
667
668 static __thread unsigned long nextfp;
669 static __thread unsigned long nextpc;
670 static __thread unsigned long nextsp;
671 static __thread RegisterMap *reg_map;
672
673 static void printbc(Method *m, intptr_t bcx) {
674 const char *name;
675 char buf[16];
676 if (m->validate_bci_from_bcp((address)bcx) < 0
677 || !m->contains((address)bcx)) {
678 name = "???";
679 snprintf(buf, sizeof buf, "(bad)");
680 } else {
681 int bci = m->bci_from((address)bcx);
682 snprintf(buf, sizeof buf, "%d", bci);
683 name = Bytecodes::name(m->code_at(bci));
684 }
685 ResourceMark rm;
686 printf("%s : %s ==> %s\n", m->name_and_sig_as_C_string(), buf, name);
687 }
688
689 void internal_pf(unsigned long sp, unsigned long fp, unsigned long pc, unsigned long bcx) {
690 if (! fp)
691 return;
692
693 DESCRIBE_FP_OFFSET(return_addr);
694 DESCRIBE_FP_OFFSET(link);
695 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
696 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
697 DESCRIBE_FP_OFFSET(interpreter_frame_method);
698 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
699 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
700 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
701 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
702 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
703 unsigned long *p = (unsigned long *)fp;
704
705 // We want to see all frames, native and Java. For compiled and
706 // interpreted frames we have special information that allows us to
707 // unwind them; for everything else we assume that the native frame
708 // pointer chain is intact.
709 frame this_frame((intptr_t*)sp, (intptr_t*)fp, (address)pc);
710 if (this_frame.is_compiled_frame() ||
711 this_frame.is_interpreted_frame()) {
712 frame sender = this_frame.sender(reg_map);
713 nextfp = (unsigned long)sender.fp();
714 nextpc = (unsigned long)sender.pc();
715 nextsp = (unsigned long)sender.unextended_sp();
716 } else {
717 nextfp = p[frame::link_offset];
718 nextpc = p[frame::return_addr_offset];
719 nextsp = (unsigned long)&p[frame::sender_sp_offset];
720 }
721
722 if (bcx == -1ul)
723 bcx = p[frame::interpreter_frame_bcp_offset];
724
725 if (Interpreter::contains((address)pc)) {
726 Method* m = (Method*)p[frame::interpreter_frame_method_offset];
727 if(m && m->is_method()) {
728 printbc(m, bcx);
729 } else
730 printf("not a Method\n");
731 } else {
732 CodeBlob *cb = CodeCache::find_blob((address)pc);
733 if (cb != NULL) {
734 if (cb->is_nmethod()) {
735 ResourceMark rm;
736 nmethod* nm = (nmethod*)cb;
737 printf("nmethod %s\n", nm->method()->name_and_sig_as_C_string());
738 } else if (cb->name()) {
739 printf("CodeBlob %s\n", cb->name());
740 }
741 }
742 }
743 }
744
745 extern "C" void npf() {
746 CodeBlob *cb = CodeCache::find_blob((address)nextpc);
747 // C2 does not always chain the frame pointers when it can, instead
748 // preferring to use fixed offsets from SP, so a simple leave() does
749 // not work. Instead, it adds the frame size to SP then pops FP and
750 // LR. We have to do the same thing to get a good call chain.
751 if (cb && cb->frame_size())
752 nextfp = nextsp + wordSize * (cb->frame_size() - 2);
753 internal_pf (nextsp, nextfp, nextpc, -1);
754 }
755
756 extern "C" void pf(unsigned long sp, unsigned long fp, unsigned long pc,
757 unsigned long bcx, unsigned long thread) {
758 RegisterMap map((JavaThread*)thread, false);
759 if (!reg_map) {
760 reg_map = (RegisterMap*)os::malloc(sizeof map, mtNone);
761 }
762 memcpy(reg_map, &map, sizeof map);
763 {
764 CodeBlob *cb = CodeCache::find_blob((address)pc);
765 if (cb && cb->frame_size())
766 fp = sp + wordSize * (cb->frame_size() - 2);
767 }
768 internal_pf(sp, fp, pc, bcx);
769 }
770
771 // support for printing out where we are in a Java method
772 // needs to be passed current fp and bcp register values
773 // prints method name, bc index and bytecode name
774 extern "C" void pm(unsigned long fp, unsigned long bcx) {
775 DESCRIBE_FP_OFFSET(interpreter_frame_method);
776 unsigned long *p = (unsigned long *)fp;
777 Method* m = (Method*)p[frame::interpreter_frame_method_offset];
778 printbc(m, bcx);
779 }
780
781 #ifndef PRODUCT
782 // This is a generic constructor which is only used by pns() in debug.cpp.
783 frame::frame(void* sp, void* fp, void* pc) {
784 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
785 }
786 #endif
787
788 void JavaFrameAnchor::make_walkable(JavaThread* thread) {
789 // last frame set?
790 if (last_Java_sp() == NULL) return;
791 // already walkable?
792 if (walkable()) return;
793 vmassert(Thread::current() == (Thread*)thread, "not current thread");
794 vmassert(last_Java_sp() != NULL, "not called from Java code?");
795 vmassert(last_Java_pc() == NULL, "already walkable");
796 capture_last_Java_pc();
797 vmassert(walkable(), "something went wrong");
798 }
799
800 void JavaFrameAnchor::capture_last_Java_pc() {
801 vmassert(_last_Java_sp != NULL, "no last frame set");
802 vmassert(_last_Java_pc == NULL, "already walkable");
803 _last_Java_pc = (address)_last_Java_sp[-1];
804 }