1/*
2 * Copyright (c) 1997, 2018, 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 */
24
25#include "precompiled.hpp"
26#include "interpreter/interpreter.hpp"
27#include "memory/resourceArea.hpp"
28#include "memory/universe.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.inline.hpp"
38#include "runtime/signature.hpp"
39#include "runtime/stubCodeGenerator.hpp"
40#include "runtime/stubRoutines.hpp"
41#include "vmreg_x86.inline.hpp"
42#ifdef COMPILER1
43#include "c1/c1_Runtime1.hpp"
44#include "runtime/vframeArray.hpp"
45#endif
46
47#ifdef ASSERT
48void RegisterMap::check_location_valid() {
49}
50#endif
51
52// Profiling/safepoint support
53
54bool frame::safe_for_sender(JavaThread *thread) {
55 address sp = (address)_sp;
56 address fp = (address)_fp;
57 address unextended_sp = (address)_unextended_sp;
58
59 // consider stack guards when trying to determine "safe" stack pointers
60 static size_t stack_guard_size = os::uses_stack_guard_pages() ?
61 JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_zone_size() : 0;
62 size_t usable_stack_size = thread->stack_size() - stack_guard_size;
63
64 // sp must be within the usable part of the stack (not in guards)
65 bool sp_safe = (sp < thread->stack_base()) &&
66 (sp >= thread->stack_base() - usable_stack_size);
67
68
69 if (!sp_safe) {
70 return false;
71 }
72
73 // unextended sp must be within the stack and above or equal sp
74 bool unextended_sp_safe = (unextended_sp < thread->stack_base()) &&
75 (unextended_sp >= sp);
76
77 if (!unextended_sp_safe) {
78 return false;
79 }
80
81 // an fp must be within the stack and above (but not equal) sp
82 // second evaluation on fp+ is added to handle situation where fp is -1
83 bool fp_safe = (fp < thread->stack_base() && (fp > sp) && (((fp + (return_addr_offset * sizeof(void*))) < thread->stack_base())));
84
85 // We know sp/unextended_sp are safe only fp is questionable here
86
87 // If the current frame is known to the code cache then we can attempt to
88 // to construct the sender and do some validation of it. This goes a long way
89 // toward eliminating issues when we get in frame construction code
90
91 if (_cb != NULL ) {
92
93 // First check if frame is complete and tester is reliable
94 // Unfortunately we can only check frame complete for runtime stubs and nmethod
95 // other generic buffer blobs are more problematic so we just assume they are
96 // ok. adapter blobs never have a frame complete and are never ok.
97
98 if (!_cb->is_frame_complete_at(_pc)) {
99 if (_cb->is_compiled() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
100 return false;
101 }
102 }
103
104 // Could just be some random pointer within the codeBlob
105 if (!_cb->code_contains(_pc)) {
106 return false;
107 }
108
109 // Entry frame checks
110 if (is_entry_frame()) {
111 // an entry frame must have a valid fp.
112 return fp_safe && is_entry_frame_valid(thread);
113 }
114
115 intptr_t* sender_sp = NULL;
116 intptr_t* sender_unextended_sp = NULL;
117 address sender_pc = NULL;
118 intptr_t* saved_fp = NULL;
119
120 if (is_interpreted_frame()) {
121 // fp must be safe
122 if (!fp_safe) {
123 return false;
124 }
125
126 sender_pc = (address) this->fp()[return_addr_offset];
127 // for interpreted frames, the value below is the sender "raw" sp,
128 // which can be different from the sender unextended sp (the sp seen
129 // by the sender) because of current frame local variables
130 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
131 sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
132 saved_fp = (intptr_t*) this->fp()[link_offset];
133
134 } else {
135 // must be some sort of compiled/runtime frame
136 // fp does not have to be safe (although it could be check for c1?)
137
138 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
139 if (_cb->frame_size() <= 0) {
140 return false;
141 }
142
143 sender_sp = _unextended_sp + _cb->frame_size();
144 // Is sender_sp safe?
145 if ((address)sender_sp >= thread->stack_base()) {
146 return false;
147 }
148 sender_unextended_sp = sender_sp;
149 // On Intel the return_address is always the word on the stack
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 // 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 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
271void 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 p2i(pc_addr), p2i(*pc_addr), p2i(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 = CompiledMethod::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
293bool frame::is_interpreted_frame() const {
294 return Interpreter::contains(pc());
295}
296
297int frame::frame_size(RegisterMap* map) const {
298 frame sender = this->sender(map);
299 return sender.sp() - sp();
300}
301
302intptr_t* frame::entry_frame_argument_at(int offset) const {
303 // convert offset to index to deal with tsi
304 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
305 // Entry frame's arguments are always in relation to unextended_sp()
306 return &unextended_sp()[index];
307}
308
309// sender_sp
310
311intptr_t* frame::interpreter_frame_sender_sp() const {
312 assert(is_interpreted_frame(), "interpreted frame expected");
313 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
314}
315
316void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
317 assert(is_interpreted_frame(), "interpreted frame expected");
318 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
319}
320
321
322// monitor elements
323
324BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
325 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
326}
327
328BasicObjectLock* frame::interpreter_frame_monitor_end() const {
329 BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
330 // make sure the pointer points inside the frame
331 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
332 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer");
333 return result;
334}
335
336void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
337 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
338}
339
340// Used by template based interpreter deoptimization
341void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
342 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
343}
344
345frame frame::sender_for_entry_frame(RegisterMap* map) const {
346 assert(map != NULL, "map must be set");
347 // Java frame called from C; skip all C frames and return top C
348 // frame of that chunk as the sender
349 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
350 assert(!entry_frame_is_first(), "next Java fp must be non zero");
351 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
352 // Since we are walking the stack now this nested anchor is obviously walkable
353 // even if it wasn't when it was stacked.
354 if (!jfa->walkable()) {
355 // Capture _last_Java_pc (if needed) and mark anchor walkable.
356 jfa->capture_last_Java_pc();
357 }
358 map->clear();
359 assert(map->include_argument_oops(), "should be set by clear");
360 vmassert(jfa->last_Java_pc() != NULL, "not walkable");
361 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
362 return fr;
363}
364
365//------------------------------------------------------------------------------
366// frame::verify_deopt_original_pc
367//
368// Verifies the calculated original PC of a deoptimization PC for the
369// given unextended SP.
370#ifdef ASSERT
371void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) {
372 frame fr;
373
374 // This is ugly but it's better than to change {get,set}_original_pc
375 // to take an SP value as argument. And it's only a debugging
376 // method anyway.
377 fr._unextended_sp = unextended_sp;
378
379 address original_pc = nm->get_original_pc(&fr);
380 assert(nm->insts_contains_inclusive(original_pc),
381 "original PC must be in the main code section of the the compiled method (or must be immediately following it)");
382}
383#endif
384
385//------------------------------------------------------------------------------
386// frame::adjust_unextended_sp
387#ifdef ASSERT
388void frame::adjust_unextended_sp() {
389 // On x86, sites calling method handle intrinsics and lambda forms are treated
390 // as any other call site. Therefore, no special action is needed when we are
391 // returning to any of these call sites.
392
393 if (_cb != NULL) {
394 CompiledMethod* sender_cm = _cb->as_compiled_method_or_null();
395 if (sender_cm != NULL) {
396 // If the sender PC is a deoptimization point, get the original PC.
397 if (sender_cm->is_deopt_entry(_pc) ||
398 sender_cm->is_deopt_mh_entry(_pc)) {
399 verify_deopt_original_pc(sender_cm, _unextended_sp);
400 }
401 }
402 }
403}
404#endif
405
406//------------------------------------------------------------------------------
407// frame::update_map_with_saved_link
408void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
409 // The interpreter and compiler(s) always save EBP/RBP in a known
410 // location on entry. We must record where that location is
411 // so this if EBP/RBP was live on callout from c2 we can find
412 // the saved copy no matter what it called.
413
414 // Since the interpreter always saves EBP/RBP if we record where it is then
415 // we don't have to always save EBP/RBP on entry and exit to c2 compiled
416 // code, on entry will be enough.
417 map->set_location(rbp->as_VMReg(), (address) link_addr);
418#ifdef AMD64
419 // this is weird "H" ought to be at a higher address however the
420 // oopMaps seems to have the "H" regs at the same address and the
421 // vanilla register.
422 // XXXX make this go away
423 if (true) {
424 map->set_location(rbp->as_VMReg()->next(), (address) link_addr);
425 }
426#endif // AMD64
427}
428
429
430//------------------------------------------------------------------------------
431// frame::sender_for_interpreter_frame
432frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
433 // SP is the raw SP from the sender after adapter or interpreter
434 // extension.
435 intptr_t* sender_sp = this->sender_sp();
436
437 // This is the sp before any possible extension (adapter/locals).
438 intptr_t* unextended_sp = interpreter_frame_sender_sp();
439
440#if COMPILER2_OR_JVMCI
441 if (map->update_map()) {
442 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
443 }
444#endif // COMPILER2_OR_JVMCI
445
446 return frame(sender_sp, unextended_sp, link(), sender_pc());
447}
448
449
450//------------------------------------------------------------------------------
451// frame::sender_for_compiled_frame
452frame frame::sender_for_compiled_frame(RegisterMap* map) const {
453 assert(map != NULL, "map must be set");
454
455 // frame owned by optimizing compiler
456 assert(_cb->frame_size() >= 0, "must have non-zero frame size");
457 intptr_t* sender_sp = unextended_sp() + _cb->frame_size();
458 intptr_t* unextended_sp = sender_sp;
459
460 // On Intel the return_address is always the word on the stack
461 address sender_pc = (address) *(sender_sp-1);
462
463 // This is the saved value of EBP which may or may not really be an FP.
464 // It is only an FP if the sender is an interpreter frame (or C1?).
465 intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
466
467 if (map->update_map()) {
468 // Tell GC to use argument oopmaps for some runtime stubs that need it.
469 // For C1, the runtime stub might not have oop maps, so set this flag
470 // outside of update_register_map.
471 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
472 if (_cb->oop_maps() != NULL) {
473 OopMapSet::update_register_map(this, map);
474 }
475
476 // Since the prolog does the save and restore of EBP there is no oopmap
477 // for it so we must fill in its location as if there was an oopmap entry
478 // since if our caller was compiled code there could be live jvm state in it.
479 update_map_with_saved_link(map, saved_fp_addr);
480 }
481
482 assert(sender_sp != sp(), "must have changed");
483 return frame(sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
484}
485
486
487//------------------------------------------------------------------------------
488// frame::sender
489frame frame::sender(RegisterMap* map) const {
490 // Default is we done have to follow them. The sender_for_xxx will
491 // update it accordingly
492 map->set_include_argument_oops(false);
493
494 if (is_entry_frame()) return sender_for_entry_frame(map);
495 if (is_interpreted_frame()) return sender_for_interpreter_frame(map);
496 assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
497
498 if (_cb != NULL) {
499 return sender_for_compiled_frame(map);
500 }
501 // Must be native-compiled frame, i.e. the marshaling code for native
502 // methods that exists in the core system.
503 return frame(sender_sp(), link(), sender_pc());
504}
505
506bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
507 assert(is_interpreted_frame(), "Not an interpreted frame");
508 // These are reasonable sanity checks
509 if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
510 return false;
511 }
512 if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
513 return false;
514 }
515 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
516 return false;
517 }
518 // These are hacks to keep us out of trouble.
519 // The problem with these is that they mask other problems
520 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
521 return false;
522 }
523
524 // do some validation of frame elements
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 (!Method::is_valid_method(m)) return false;
531
532 // stack frames shouldn't be much larger than max_stack elements
533 // this test requires the use the 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/bcp
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 (MetaspaceObj::is_valid(cp) == false) 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
562BasicType 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 // Prior to calling into the runtime to report the method_exit the possible
570 // return value is pushed to the native stack. If the result is a jfloat/jdouble
571 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
572 tos_addr = (intptr_t*)sp();
573 if (type == T_FLOAT || type == T_DOUBLE) {
574 // QQQ seems like this code is equivalent on the two platforms
575#ifdef AMD64
576 // This is times two because we do a push(ltos) after pushing XMM0
577 // and that takes two interpreter stack slots.
578 tos_addr += 2 * Interpreter::stackElementWords;
579#else
580 tos_addr += 2;
581#endif // AMD64
582 }
583 } else {
584 tos_addr = (intptr_t*)interpreter_frame_tos_address();
585 }
586
587 switch (type) {
588 case T_OBJECT :
589 case T_ARRAY : {
590 oop obj;
591 if (method->is_native()) {
592 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
593 } else {
594 oop* obj_p = (oop*)tos_addr;
595 obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
596 }
597 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
598 *oop_result = obj;
599 break;
600 }
601 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
602 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
603 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
604 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
605 case T_INT : value_result->i = *(jint*)tos_addr; break;
606 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
607 case T_FLOAT : {
608#ifdef AMD64
609 value_result->f = *(jfloat*)tos_addr;
610#else
611 if (method->is_native()) {
612 jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat
613 value_result->f = (jfloat)d;
614 } else {
615 value_result->f = *(jfloat*)tos_addr;
616 }
617#endif // AMD64
618 break;
619 }
620 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
621 case T_VOID : /* Nothing to do */ break;
622 default : ShouldNotReachHere();
623 }
624
625 return type;
626}
627
628
629intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
630 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
631 return &interpreter_frame_tos_address()[index];
632}
633
634#ifndef PRODUCT
635
636#define DESCRIBE_FP_OFFSET(name) \
637 values.describe(frame_no, fp() + frame::name##_offset, #name)
638
639void frame::describe_pd(FrameValues& values, int frame_no) {
640 if (is_interpreted_frame()) {
641 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
642 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
643 DESCRIBE_FP_OFFSET(interpreter_frame_method);
644 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
645 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
646 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
647 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
648 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
649 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
650#ifdef AMD64
651 } else if (is_entry_frame()) {
652 // This could be more descriptive if we use the enum in
653 // stubGenerator to map to real names but it's most important to
654 // claim these frame slots so the error checking works.
655 for (int i = 0; i < entry_frame_after_call_words; i++) {
656 values.describe(frame_no, fp() - i, err_msg("call_stub word fp - %d", i));
657 }
658#endif // AMD64
659 }
660}
661#endif // !PRODUCT
662
663intptr_t *frame::initial_deoptimization_info() {
664 // used to reset the saved FP
665 return fp();
666}
667
668intptr_t* frame::real_fp() const {
669 if (_cb != NULL) {
670 // use the frame size if valid
671 int size = _cb->frame_size();
672 if (size > 0) {
673 return unextended_sp() + size;
674 }
675 }
676 // else rely on fp()
677 assert(! is_compiled_frame(), "unknown compiled frame size");
678 return fp();
679}
680
681#ifndef PRODUCT
682// This is a generic constructor which is only used by pns() in debug.cpp.
683frame::frame(void* sp, void* fp, void* pc) {
684 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
685}
686
687void frame::pd_ps() {}
688#endif
689
690void JavaFrameAnchor::make_walkable(JavaThread* thread) {
691 // last frame set?
692 if (last_Java_sp() == NULL) return;
693 // already walkable?
694 if (walkable()) return;
695 vmassert(Thread::current() == (Thread*)thread, "not current thread");
696 vmassert(last_Java_sp() != NULL, "not called from Java code?");
697 vmassert(last_Java_pc() == NULL, "already walkable");
698 capture_last_Java_pc();
699 vmassert(walkable(), "something went wrong");
700}
701
702void JavaFrameAnchor::capture_last_Java_pc() {
703 vmassert(_last_Java_sp != NULL, "no last frame set");
704 vmassert(_last_Java_pc == NULL, "already walkable");
705 _last_Java_pc = (address)_last_Java_sp[-1];
706}
707