Thu, 03 Nov 2011 04:12:49 -0700
7106944: assert(_pc == *pc_addr) failed may be too strong
Reviewed-by: kvn, never
1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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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).
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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.
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20 * or visit www.oracle.com if you need additional information or have any
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23 */
25 #include "precompiled.hpp"
26 #include "interpreter/interpreter.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "oops/markOop.hpp"
29 #include "oops/methodOop.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "runtime/frame.inline.hpp"
32 #include "runtime/handles.inline.hpp"
33 #include "runtime/javaCalls.hpp"
34 #include "runtime/monitorChunk.hpp"
35 #include "runtime/signature.hpp"
36 #include "runtime/stubCodeGenerator.hpp"
37 #include "runtime/stubRoutines.hpp"
38 #include "vmreg_x86.inline.hpp"
39 #ifdef COMPILER1
40 #include "c1/c1_Runtime1.hpp"
41 #include "runtime/vframeArray.hpp"
42 #endif
44 #ifdef ASSERT
45 void RegisterMap::check_location_valid() {
46 }
47 #endif
50 // Profiling/safepoint support
52 bool frame::safe_for_sender(JavaThread *thread) {
53 address sp = (address)_sp;
54 address fp = (address)_fp;
55 address unextended_sp = (address)_unextended_sp;
56 // sp must be within the stack
57 bool sp_safe = (sp <= thread->stack_base()) &&
58 (sp >= thread->stack_base() - thread->stack_size());
60 if (!sp_safe) {
61 return false;
62 }
64 // unextended sp must be within the stack and above or equal sp
65 bool unextended_sp_safe = (unextended_sp <= thread->stack_base()) &&
66 (unextended_sp >= sp);
68 if (!unextended_sp_safe) {
69 return false;
70 }
72 // an fp must be within the stack and above (but not equal) sp
73 bool fp_safe = (fp <= thread->stack_base()) && (fp > sp);
75 // We know sp/unextended_sp are safe only fp is questionable here
77 // If the current frame is known to the code cache then we can attempt to
78 // to construct the sender and do some validation of it. This goes a long way
79 // toward eliminating issues when we get in frame construction code
81 if (_cb != NULL ) {
83 // First check if frame is complete and tester is reliable
84 // Unfortunately we can only check frame complete for runtime stubs and nmethod
85 // other generic buffer blobs are more problematic so we just assume they are
86 // ok. adapter blobs never have a frame complete and are never ok.
88 if (!_cb->is_frame_complete_at(_pc)) {
89 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
90 return false;
91 }
92 }
93 // Entry frame checks
94 if (is_entry_frame()) {
95 // an entry frame must have a valid fp.
97 if (!fp_safe) return false;
99 // Validate the JavaCallWrapper an entry frame must have
101 address jcw = (address)entry_frame_call_wrapper();
103 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > fp);
105 return jcw_safe;
107 }
109 intptr_t* sender_sp = NULL;
110 address sender_pc = NULL;
112 if (is_interpreted_frame()) {
113 // fp must be safe
114 if (!fp_safe) {
115 return false;
116 }
118 sender_pc = (address) this->fp()[return_addr_offset];
119 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
121 } else {
122 // must be some sort of compiled/runtime frame
123 // fp does not have to be safe (although it could be check for c1?)
125 sender_sp = _unextended_sp + _cb->frame_size();
126 // On Intel the return_address is always the word on the stack
127 sender_pc = (address) *(sender_sp-1);
128 }
130 // We must always be able to find a recognizable pc
131 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
132 if (sender_pc == NULL || sender_blob == NULL) {
133 return false;
134 }
137 // If the potential sender is the interpreter then we can do some more checking
138 if (Interpreter::contains(sender_pc)) {
140 // ebp is always saved in a recognizable place in any code we generate. However
141 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
142 // is really a frame pointer.
144 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
145 bool saved_fp_safe = ((address)saved_fp <= thread->stack_base()) && (saved_fp > sender_sp);
147 if (!saved_fp_safe) {
148 return false;
149 }
151 // construct the potential sender
153 frame sender(sender_sp, saved_fp, sender_pc);
155 return sender.is_interpreted_frame_valid(thread);
157 }
159 // Could just be some random pointer within the codeBlob
160 if (!sender_blob->code_contains(sender_pc)) {
161 return false;
162 }
164 // We should never be able to see an adapter if the current frame is something from code cache
165 if (sender_blob->is_adapter_blob()) {
166 return false;
167 }
169 // Could be the call_stub
171 if (StubRoutines::returns_to_call_stub(sender_pc)) {
172 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
173 bool saved_fp_safe = ((address)saved_fp <= thread->stack_base()) && (saved_fp > sender_sp);
175 if (!saved_fp_safe) {
176 return false;
177 }
179 // construct the potential sender
181 frame sender(sender_sp, saved_fp, sender_pc);
183 // Validate the JavaCallWrapper an entry frame must have
184 address jcw = (address)sender.entry_frame_call_wrapper();
186 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > (address)sender.fp());
188 return jcw_safe;
189 }
191 // If the frame size is 0 something is bad because every nmethod has a non-zero frame size
192 // because the return address counts against the callee's frame.
194 if (sender_blob->frame_size() == 0) {
195 assert(!sender_blob->is_nmethod(), "should count return address at least");
196 return false;
197 }
199 // We should never be able to see anything here except an nmethod. If something in the
200 // code cache (current frame) is called by an entity within the code cache that entity
201 // should not be anything but the call stub (already covered), the interpreter (already covered)
202 // or an nmethod.
204 assert(sender_blob->is_nmethod(), "Impossible call chain");
206 // Could put some more validation for the potential non-interpreted sender
207 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
209 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
211 // We've validated the potential sender that would be created
212 return true;
213 }
215 // Must be native-compiled frame. Since sender will try and use fp to find
216 // linkages it must be safe
218 if (!fp_safe) {
219 return false;
220 }
222 // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
224 if ( (address) this->fp()[return_addr_offset] == NULL) return false;
227 // could try and do some more potential verification of native frame if we could think of some...
229 return true;
231 }
234 void frame::patch_pc(Thread* thread, address pc) {
235 address* pc_addr = &(((address*) sp())[-1]);
236 if (TracePcPatching) {
237 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
238 pc_addr, *pc_addr, pc);
239 }
240 // Either the return address is the original one or we are going to
241 // patch in the same address that's already there.
242 assert(_pc == *pc_addr || pc == *pc_addr, "must be");
243 *pc_addr = pc;
244 _cb = CodeCache::find_blob(pc);
245 address original_pc = nmethod::get_deopt_original_pc(this);
246 if (original_pc != NULL) {
247 assert(original_pc == _pc, "expected original PC to be stored before patching");
248 _deopt_state = is_deoptimized;
249 // leave _pc as is
250 } else {
251 _deopt_state = not_deoptimized;
252 _pc = pc;
253 }
254 }
256 bool frame::is_interpreted_frame() const {
257 return Interpreter::contains(pc());
258 }
260 int frame::frame_size(RegisterMap* map) const {
261 frame sender = this->sender(map);
262 return sender.sp() - sp();
263 }
265 intptr_t* frame::entry_frame_argument_at(int offset) const {
266 // convert offset to index to deal with tsi
267 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
268 // Entry frame's arguments are always in relation to unextended_sp()
269 return &unextended_sp()[index];
270 }
272 // sender_sp
273 #ifdef CC_INTERP
274 intptr_t* frame::interpreter_frame_sender_sp() const {
275 assert(is_interpreted_frame(), "interpreted frame expected");
276 // QQQ why does this specialize method exist if frame::sender_sp() does same thing?
277 // seems odd and if we always know interpreted vs. non then sender_sp() is really
278 // doing too much work.
279 return get_interpreterState()->sender_sp();
280 }
282 // monitor elements
284 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
285 return get_interpreterState()->monitor_base();
286 }
288 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
289 return (BasicObjectLock*) get_interpreterState()->stack_base();
290 }
292 #else // CC_INTERP
294 intptr_t* frame::interpreter_frame_sender_sp() const {
295 assert(is_interpreted_frame(), "interpreted frame expected");
296 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
297 }
299 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
300 assert(is_interpreted_frame(), "interpreted frame expected");
301 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
302 }
305 // monitor elements
307 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
308 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
309 }
311 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
312 BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
313 // make sure the pointer points inside the frame
314 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
315 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer");
316 return result;
317 }
319 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
320 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
321 }
323 // Used by template based interpreter deoptimization
324 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
325 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
326 }
327 #endif // CC_INTERP
329 frame frame::sender_for_entry_frame(RegisterMap* map) const {
330 assert(map != NULL, "map must be set");
331 // Java frame called from C; skip all C frames and return top C
332 // frame of that chunk as the sender
333 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
334 assert(!entry_frame_is_first(), "next Java fp must be non zero");
335 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
336 map->clear();
337 assert(map->include_argument_oops(), "should be set by clear");
338 if (jfa->last_Java_pc() != NULL ) {
339 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
340 return fr;
341 }
342 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp());
343 return fr;
344 }
346 //------------------------------------------------------------------------------
347 // frame::verify_deopt_original_pc
348 //
349 // Verifies the calculated original PC of a deoptimization PC for the
350 // given unextended SP. The unextended SP might also be the saved SP
351 // for MethodHandle call sites.
352 #if ASSERT
353 void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp, bool is_method_handle_return) {
354 frame fr;
356 // This is ugly but it's better than to change {get,set}_original_pc
357 // to take an SP value as argument. And it's only a debugging
358 // method anyway.
359 fr._unextended_sp = unextended_sp;
361 address original_pc = nm->get_original_pc(&fr);
362 assert(nm->insts_contains(original_pc), "original PC must be in nmethod");
363 assert(nm->is_method_handle_return(original_pc) == is_method_handle_return, "must be");
364 }
365 #endif
367 //------------------------------------------------------------------------------
368 // frame::adjust_unextended_sp
369 void frame::adjust_unextended_sp() {
370 // If we are returning to a compiled MethodHandle call site, the
371 // saved_fp will in fact be a saved value of the unextended SP. The
372 // simplest way to tell whether we are returning to such a call site
373 // is as follows:
375 nmethod* sender_nm = (_cb == NULL) ? NULL : _cb->as_nmethod_or_null();
376 if (sender_nm != NULL) {
377 // If the sender PC is a deoptimization point, get the original
378 // PC. For MethodHandle call site the unextended_sp is stored in
379 // saved_fp.
380 if (sender_nm->is_deopt_mh_entry(_pc)) {
381 DEBUG_ONLY(verify_deopt_mh_original_pc(sender_nm, _fp));
382 _unextended_sp = _fp;
383 }
384 else if (sender_nm->is_deopt_entry(_pc)) {
385 DEBUG_ONLY(verify_deopt_original_pc(sender_nm, _unextended_sp));
386 }
387 else if (sender_nm->is_method_handle_return(_pc)) {
388 _unextended_sp = _fp;
389 }
390 }
391 }
393 //------------------------------------------------------------------------------
394 // frame::update_map_with_saved_link
395 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
396 // The interpreter and compiler(s) always save EBP/RBP in a known
397 // location on entry. We must record where that location is
398 // so this if EBP/RBP was live on callout from c2 we can find
399 // the saved copy no matter what it called.
401 // Since the interpreter always saves EBP/RBP if we record where it is then
402 // we don't have to always save EBP/RBP on entry and exit to c2 compiled
403 // code, on entry will be enough.
404 map->set_location(rbp->as_VMReg(), (address) link_addr);
405 #ifdef AMD64
406 // this is weird "H" ought to be at a higher address however the
407 // oopMaps seems to have the "H" regs at the same address and the
408 // vanilla register.
409 // XXXX make this go away
410 if (true) {
411 map->set_location(rbp->as_VMReg()->next(), (address) link_addr);
412 }
413 #endif // AMD64
414 }
417 //------------------------------------------------------------------------------
418 // frame::sender_for_interpreter_frame
419 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
420 // SP is the raw SP from the sender after adapter or interpreter
421 // extension.
422 intptr_t* sender_sp = this->sender_sp();
424 // This is the sp before any possible extension (adapter/locals).
425 intptr_t* unextended_sp = interpreter_frame_sender_sp();
427 #ifdef COMPILER2
428 if (map->update_map()) {
429 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
430 }
431 #endif // COMPILER2
433 return frame(sender_sp, unextended_sp, link(), sender_pc());
434 }
437 //------------------------------------------------------------------------------
438 // frame::sender_for_compiled_frame
439 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
440 assert(map != NULL, "map must be set");
441 assert(!is_ricochet_frame(), "caller must handle this");
443 // frame owned by optimizing compiler
444 assert(_cb->frame_size() >= 0, "must have non-zero frame size");
445 intptr_t* sender_sp = unextended_sp() + _cb->frame_size();
446 intptr_t* unextended_sp = sender_sp;
448 // On Intel the return_address is always the word on the stack
449 address sender_pc = (address) *(sender_sp-1);
451 // This is the saved value of EBP which may or may not really be an FP.
452 // It is only an FP if the sender is an interpreter frame (or C1?).
453 intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
455 if (map->update_map()) {
456 // Tell GC to use argument oopmaps for some runtime stubs that need it.
457 // For C1, the runtime stub might not have oop maps, so set this flag
458 // outside of update_register_map.
459 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
460 if (_cb->oop_maps() != NULL) {
461 OopMapSet::update_register_map(this, map);
462 }
464 // Since the prolog does the save and restore of EBP there is no oopmap
465 // for it so we must fill in its location as if there was an oopmap entry
466 // since if our caller was compiled code there could be live jvm state in it.
467 update_map_with_saved_link(map, saved_fp_addr);
468 }
470 assert(sender_sp != sp(), "must have changed");
471 return frame(sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
472 }
475 //------------------------------------------------------------------------------
476 // frame::sender
477 frame frame::sender(RegisterMap* map) const {
478 // Default is we done have to follow them. The sender_for_xxx will
479 // update it accordingly
480 map->set_include_argument_oops(false);
482 if (is_entry_frame()) return sender_for_entry_frame(map);
483 if (is_interpreted_frame()) return sender_for_interpreter_frame(map);
484 assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
485 if (is_ricochet_frame()) return sender_for_ricochet_frame(map);
487 if (_cb != NULL) {
488 return sender_for_compiled_frame(map);
489 }
490 // Must be native-compiled frame, i.e. the marshaling code for native
491 // methods that exists in the core system.
492 return frame(sender_sp(), link(), sender_pc());
493 }
496 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) {
497 assert(is_interpreted_frame(), "must be interpreter frame");
498 methodOop method = interpreter_frame_method();
499 // When unpacking an optimized frame the frame pointer is
500 // adjusted with:
501 int diff = (method->max_locals() - method->size_of_parameters()) *
502 Interpreter::stackElementWords;
503 return _fp == (fp - diff);
504 }
506 void frame::pd_gc_epilog() {
507 // nothing done here now
508 }
510 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
511 // QQQ
512 #ifdef CC_INTERP
513 #else
514 assert(is_interpreted_frame(), "Not an interpreted frame");
515 // These are reasonable sanity checks
516 if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
517 return false;
518 }
519 if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
520 return false;
521 }
522 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
523 return false;
524 }
525 // These are hacks to keep us out of trouble.
526 // The problem with these is that they mask other problems
527 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
528 return false;
529 }
531 // do some validation of frame elements
533 // first the method
535 methodOop m = *interpreter_frame_method_addr();
537 // validate the method we'd find in this potential sender
538 if (!Universe::heap()->is_valid_method(m)) return false;
540 // stack frames shouldn't be much larger than max_stack elements
542 if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
543 return false;
544 }
546 // validate bci/bcx
548 intptr_t bcx = interpreter_frame_bcx();
549 if (m->validate_bci_from_bcx(bcx) < 0) {
550 return false;
551 }
553 // validate constantPoolCacheOop
555 constantPoolCacheOop cp = *interpreter_frame_cache_addr();
557 if (cp == NULL ||
558 !Space::is_aligned(cp) ||
559 !Universe::heap()->is_permanent((void*)cp)) return false;
561 // validate locals
563 address locals = (address) *interpreter_frame_locals_addr();
565 if (locals > thread->stack_base() || locals < (address) fp()) return false;
567 // We'd have to be pretty unlucky to be mislead at this point
569 #endif // CC_INTERP
570 return true;
571 }
573 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
574 #ifdef CC_INTERP
575 // Needed for JVMTI. The result should always be in the
576 // interpreterState object
577 interpreterState istate = get_interpreterState();
578 #endif // CC_INTERP
579 assert(is_interpreted_frame(), "interpreted frame expected");
580 methodOop method = interpreter_frame_method();
581 BasicType type = method->result_type();
583 intptr_t* tos_addr;
584 if (method->is_native()) {
585 // Prior to calling into the runtime to report the method_exit the possible
586 // return value is pushed to the native stack. If the result is a jfloat/jdouble
587 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
588 tos_addr = (intptr_t*)sp();
589 if (type == T_FLOAT || type == T_DOUBLE) {
590 // QQQ seems like this code is equivalent on the two platforms
591 #ifdef AMD64
592 // This is times two because we do a push(ltos) after pushing XMM0
593 // and that takes two interpreter stack slots.
594 tos_addr += 2 * Interpreter::stackElementWords;
595 #else
596 tos_addr += 2;
597 #endif // AMD64
598 }
599 } else {
600 tos_addr = (intptr_t*)interpreter_frame_tos_address();
601 }
603 switch (type) {
604 case T_OBJECT :
605 case T_ARRAY : {
606 oop obj;
607 if (method->is_native()) {
608 #ifdef CC_INTERP
609 obj = istate->_oop_temp;
610 #else
611 obj = (oop) at(interpreter_frame_oop_temp_offset);
612 #endif // CC_INTERP
613 } else {
614 oop* obj_p = (oop*)tos_addr;
615 obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
616 }
617 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
618 *oop_result = obj;
619 break;
620 }
621 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
622 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
623 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
624 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
625 case T_INT : value_result->i = *(jint*)tos_addr; break;
626 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
627 case T_FLOAT : {
628 #ifdef AMD64
629 value_result->f = *(jfloat*)tos_addr;
630 #else
631 if (method->is_native()) {
632 jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat
633 value_result->f = (jfloat)d;
634 } else {
635 value_result->f = *(jfloat*)tos_addr;
636 }
637 #endif // AMD64
638 break;
639 }
640 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
641 case T_VOID : /* Nothing to do */ break;
642 default : ShouldNotReachHere();
643 }
645 return type;
646 }
649 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
650 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
651 return &interpreter_frame_tos_address()[index];
652 }
654 #ifdef ASSERT
656 #define DESCRIBE_FP_OFFSET(name) \
657 values.describe(frame_no, fp() + frame::name##_offset, #name)
659 void frame::describe_pd(FrameValues& values, int frame_no) {
660 if (is_interpreted_frame()) {
661 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
662 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
663 DESCRIBE_FP_OFFSET(interpreter_frame_method);
664 DESCRIBE_FP_OFFSET(interpreter_frame_mdx);
665 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
666 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
667 DESCRIBE_FP_OFFSET(interpreter_frame_bcx);
668 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
669 }
671 }
672 #endif
674 intptr_t *frame::initial_deoptimization_info() {
675 // used to reset the saved FP
676 return fp();
677 }