1 /*
2 * Copyright (c) 1997, 2024, 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 "compiler/oopMap.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "memory/resourceArea.hpp"
29 #include "memory/universe.hpp"
30 #include "oops/markWord.hpp"
31 #include "oops/method.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "runtime/continuation.hpp"
35 #include "runtime/frame.inline.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/javaCalls.hpp"
38 #include "runtime/monitorChunk.hpp"
39 #include "runtime/signature.hpp"
40 #include "runtime/stackWatermarkSet.hpp"
41 #include "runtime/stubCodeGenerator.hpp"
42 #include "runtime/stubRoutines.hpp"
43 #include "vmreg_x86.inline.hpp"
44 #include "utilities/formatBuffer.hpp"
45 #ifdef COMPILER1
46 #include "c1/c1_Runtime1.hpp"
47 #include "runtime/vframeArray.hpp"
48 #endif
49
50 #ifdef ASSERT
51 void RegisterMap::check_location_valid() {
52 }
53 #endif
54
55 // Profiling/safepoint support
56
57 bool frame::safe_for_sender(JavaThread *thread) {
58 if (is_heap_frame()) {
59 return true;
60 }
61 address sp = (address)_sp;
62 address fp = (address)_fp;
63 address unextended_sp = (address)_unextended_sp;
64
65 // consider stack guards when trying to determine "safe" stack pointers
66 // sp must be within the usable part of the stack (not in guards)
67 if (!thread->is_in_usable_stack(sp)) {
68 return false;
69 }
70
71 // unextended sp must be within the stack
72 // Note: sp can be greater than unextended_sp in the case of
73 // interpreted -> interpreted calls that go through a method handle linker,
74 // since those pop the last argument (the appendix) from the stack.
75 if (!thread->is_in_stack_range_incl(unextended_sp, sp - Interpreter::stackElementSize)) {
76 return false;
77 }
78
79 // an fp must be within the stack and above (but not equal) sp
80 // second evaluation on fp+ is added to handle situation where fp is -1
81 bool fp_safe = thread->is_in_stack_range_excl(fp, sp) &&
82 thread->is_in_full_stack_checked(fp + (return_addr_offset * sizeof(void*)));
83
84 // We know sp/unextended_sp are safe only fp is questionable here
85
86 // If the current frame is known to the code cache then we can attempt to
87 // construct the sender and do some validation of it. This goes a long way
88 // toward eliminating issues when we get in frame construction code
89
90 if (_cb != nullptr ) {
91
92 // First check if frame is complete and tester is reliable
93 // Unfortunately we can only check frame complete for runtime stubs and nmethod
94 // other generic buffer blobs are more problematic so we just assume they are
95 // ok. adapter blobs never have a frame complete and are never ok.
96
97 if (!_cb->is_frame_complete_at(_pc)) {
98 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
99 return false;
100 }
101 }
102
103 // Could just be some random pointer within the codeBlob
104 if (!_cb->code_contains(_pc)) {
105 return false;
106 }
107
108 // Entry frame checks
109 if (is_entry_frame()) {
110 // an entry frame must have a valid fp.
111 return fp_safe && is_entry_frame_valid(thread);
112 } else if (is_upcall_stub_frame()) {
113 return fp_safe;
114 }
115
116 intptr_t* sender_sp = nullptr;
117 intptr_t* sender_unextended_sp = nullptr;
118 address sender_pc = nullptr;
119 intptr_t* saved_fp = nullptr;
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 (!thread->is_in_full_stack_checked((address)sender_sp)) {
147 return false;
148 }
149 sender_unextended_sp = sender_sp;
150 // On Intel the return_address is always the word on the stack
151 sender_pc = (address) *(sender_sp-1);
152 // Note: frame::sender_sp_offset is only valid for compiled frame
153 saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset);
154 }
155
156 if (Continuation::is_return_barrier_entry(sender_pc)) {
157 // If our sender_pc is the return barrier, then our "real" sender is the continuation entry
158 frame s = Continuation::continuation_bottom_sender(thread, *this, sender_sp);
159 sender_sp = s.sp();
160 sender_pc = s.pc();
161 }
162
163 // If the potential sender is the interpreter then we can do some more checking
164 if (Interpreter::contains(sender_pc)) {
165
166 // ebp is always saved in a recognizable place in any code we generate. However
167 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
168 // is really a frame pointer.
169
170 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
171 return false;
172 }
173
174 // construct the potential sender
175
176 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
177
178 return sender.is_interpreted_frame_valid(thread);
179
180 }
181
182 // We must always be able to find a recognizable pc
183 CodeBlob* sender_blob = CodeCache::find_blob(sender_pc);
184 if (sender_pc == nullptr || sender_blob == nullptr) {
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 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
201 return false;
202 }
203
204 // construct the potential sender
205
206 frame sender(sender_sp, sender_unextended_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 return thread->is_in_stack_range_excl(jcw, (address)sender.fp());
212 } else if (sender_blob->is_upcall_stub()) {
213 return false;
214 }
215
216 nmethod* nm = sender_blob->as_nmethod_or_null();
217 if (nm != nullptr) {
218 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
219 nm->method()->is_method_handle_intrinsic()) {
220 return false;
221 }
222 }
223
224 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
225 // because the return address counts against the callee's frame.
226
227 if (sender_blob->frame_size() <= 0) {
228 assert(!sender_blob->is_nmethod(), "should count return address at least");
229 return false;
230 }
231
232 // We should never be able to see anything here except an nmethod. If something in the
233 // code cache (current frame) is called by an entity within the code cache that entity
234 // should not be anything but the call stub (already covered), the interpreter (already covered)
235 // or an nmethod.
236
237 if (!sender_blob->is_nmethod()) {
238 return false;
239 }
240
241 // Could put some more validation for the potential non-interpreted sender
242 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
243
244 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
245
246 // We've validated the potential sender that would be created
247 return true;
248 }
249
250 // Must be native-compiled frame. Since sender will try and use fp to find
251 // linkages it must be safe
252
253 if (!fp_safe) {
254 return false;
255 }
256
257 // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
258
259 if ( (address) this->fp()[return_addr_offset] == nullptr) return false;
260
261
262 // could try and do some more potential verification of native frame if we could think of some...
263
264 return true;
265
266 }
267
268
269 void frame::patch_pc(Thread* thread, address pc) {
270 assert(_cb == CodeCache::find_blob(pc), "unexpected pc");
271 address* pc_addr = &(((address*) sp())[-1]);
272
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
280 assert(!Continuation::is_return_barrier_entry(*pc_addr), "return barrier");
281
282 assert(_pc == *pc_addr || pc == *pc_addr || *pc_addr == nullptr, "");
283 DEBUG_ONLY(address old_pc = _pc;)
284 *pc_addr = pc;
285 _pc = pc; // must be set before call to get_deopt_original_pc
286 address original_pc = get_deopt_original_pc();
287 if (original_pc != nullptr) {
288 assert(original_pc == old_pc, "expected original PC to be stored before patching");
289 _deopt_state = is_deoptimized;
290 _pc = original_pc;
291 } else {
292 _deopt_state = not_deoptimized;
293 }
294 assert(!is_compiled_frame() || !_cb->as_nmethod()->is_deopt_entry(_pc), "must be");
295
296 #ifdef ASSERT
297 {
298 frame f(this->sp(), this->unextended_sp(), this->fp(), pc);
299 assert(f.is_deoptimized_frame() == this->is_deoptimized_frame() && f.pc() == this->pc() && f.raw_pc() == this->raw_pc(),
300 "must be (f.is_deoptimized_frame(): %d this->is_deoptimized_frame(): %d "
301 "f.pc(): " INTPTR_FORMAT " this->pc(): " INTPTR_FORMAT " f.raw_pc(): " INTPTR_FORMAT " this->raw_pc(): " INTPTR_FORMAT ")",
302 f.is_deoptimized_frame(), this->is_deoptimized_frame(), p2i(f.pc()), p2i(this->pc()), p2i(f.raw_pc()), p2i(this->raw_pc()));
303 }
304 #endif
305 }
306
307 intptr_t* frame::entry_frame_argument_at(int offset) const {
308 // convert offset to index to deal with tsi
309 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
310 // Entry frame's arguments are always in relation to unextended_sp()
311 return &unextended_sp()[index];
312 }
313
314 // locals
315
316 void frame::interpreter_frame_set_locals(intptr_t* locs) {
317 assert(is_interpreted_frame(), "interpreted frame expected");
318 // set relativized locals
319 ptr_at_put(interpreter_frame_locals_offset, (intptr_t) (locs - fp()));
320 }
321
322 // sender_sp
323
324 intptr_t* frame::interpreter_frame_sender_sp() const {
325 assert(is_interpreted_frame(), "interpreted frame expected");
326 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
327 }
328
329 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
330 assert(is_interpreted_frame(), "interpreted frame expected");
331 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
332 }
333
334
335 // monitor elements
336
337 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
338 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
339 }
340
341 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
342 BasicObjectLock* result = (BasicObjectLock*) at_relative(interpreter_frame_monitor_block_top_offset);
343 // make sure the pointer points inside the frame
344 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
345 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer: result: " INTPTR_FORMAT " fp: " INTPTR_FORMAT, p2i(result), p2i(fp()));
346 return result;
347 }
348
349 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
350 assert(is_interpreted_frame(), "interpreted frame expected");
351 // set relativized monitor_block_top
352 ptr_at_put(interpreter_frame_monitor_block_top_offset, (intptr_t*)value - fp());
353 assert(at_absolute(interpreter_frame_monitor_block_top_offset) <= interpreter_frame_monitor_block_top_offset, "");
354 }
355
356 // Used by template based interpreter deoptimization
357 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
358 assert(is_interpreted_frame(), "interpreted frame expected");
359 // set relativized last_sp
360 ptr_at_put(interpreter_frame_last_sp_offset, sp != nullptr ? (sp - fp()) : 0);
361 }
362
363 frame frame::sender_for_entry_frame(RegisterMap* map) const {
364 assert(map != nullptr, "map must be set");
365 // Java frame called from C; skip all C frames and return top C
366 // frame of that chunk as the sender
367 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
368 assert(!entry_frame_is_first(), "next Java fp must be non zero");
369 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
370 // Since we are walking the stack now this nested anchor is obviously walkable
371 // even if it wasn't when it was stacked.
372 jfa->make_walkable();
373 map->clear();
374 assert(map->include_argument_oops(), "should be set by clear");
375 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
376
377 return fr;
378 }
379
380 UpcallStub::FrameData* UpcallStub::frame_data_for_frame(const frame& frame) const {
381 assert(frame.is_upcall_stub_frame(), "wrong frame");
382 // need unextended_sp here, since normal sp is wrong for interpreter callees
383 return reinterpret_cast<UpcallStub::FrameData*>(
384 reinterpret_cast<address>(frame.unextended_sp()) + in_bytes(_frame_data_offset));
385 }
386
387 bool frame::upcall_stub_frame_is_first() const {
388 assert(is_upcall_stub_frame(), "must be optimzed entry frame");
389 UpcallStub* blob = _cb->as_upcall_stub();
390 JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
391 return jfa->last_Java_sp() == nullptr;
392 }
393
394 frame frame::sender_for_upcall_stub_frame(RegisterMap* map) const {
395 assert(map != nullptr, "map must be set");
396 UpcallStub* blob = _cb->as_upcall_stub();
397 // Java frame called from C; skip all C frames and return top C
398 // frame of that chunk as the sender
399 JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
400 assert(!upcall_stub_frame_is_first(), "must have a frame anchor to go back to");
401 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
402 // Since we are walking the stack now this nested anchor is obviously walkable
403 // even if it wasn't when it was stacked.
404 jfa->make_walkable();
405 map->clear();
406 assert(map->include_argument_oops(), "should be set by clear");
407 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
408
409 return fr;
410 }
411
412 //------------------------------------------------------------------------------
413 // frame::verify_deopt_original_pc
414 //
415 // Verifies the calculated original PC of a deoptimization PC for the
416 // given unextended SP.
417 #ifdef ASSERT
418 void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp) {
419 frame fr;
420
421 // This is ugly but it's better than to change {get,set}_original_pc
422 // to take an SP value as argument. And it's only a debugging
423 // method anyway.
424 fr._unextended_sp = unextended_sp;
425
426 address original_pc = nm->get_original_pc(&fr);
427 assert(nm->insts_contains_inclusive(original_pc),
428 "original PC must be in the main code section of the compiled method (or must be immediately following it) original_pc: " INTPTR_FORMAT " unextended_sp: " INTPTR_FORMAT " name: %s", p2i(original_pc), p2i(unextended_sp), nm->name());
429 }
430 #endif
431
432 //------------------------------------------------------------------------------
433 // frame::adjust_unextended_sp
434 #ifdef ASSERT
435 void frame::adjust_unextended_sp() {
436 // On x86, sites calling method handle intrinsics and lambda forms are treated
437 // as any other call site. Therefore, no special action is needed when we are
438 // returning to any of these call sites.
439
440 if (_cb != nullptr) {
441 nmethod* sender_nm = _cb->as_nmethod_or_null();
442 if (sender_nm != nullptr) {
443 // If the sender PC is a deoptimization point, get the original PC.
444 if (sender_nm->is_deopt_entry(_pc) ||
445 sender_nm->is_deopt_mh_entry(_pc)) {
446 verify_deopt_original_pc(sender_nm, _unextended_sp);
447 }
448 }
449 }
450 }
451 #endif
452
453 //------------------------------------------------------------------------------
454 // frame::sender_for_interpreter_frame
455 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
456 // SP is the raw SP from the sender after adapter or interpreter
457 // extension.
458 intptr_t* sender_sp = this->sender_sp();
459
460 // This is the sp before any possible extension (adapter/locals).
461 intptr_t* unextended_sp = interpreter_frame_sender_sp();
462 intptr_t* sender_fp = link();
463
464 #if COMPILER2_OR_JVMCI
465 if (map->update_map()) {
466 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
467 }
468 #endif // COMPILER2_OR_JVMCI
469
470 address sender_pc = this->sender_pc();
471
472 if (Continuation::is_return_barrier_entry(sender_pc)) {
473 if (map->walk_cont()) { // about to walk into an h-stack
474 return Continuation::top_frame(*this, map);
475 } else {
476 return Continuation::continuation_bottom_sender(map->thread(), *this, sender_sp);
477 }
478 }
479
480 return frame(sender_sp, unextended_sp, sender_fp, sender_pc);
481 }
482
483 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
484 assert(is_interpreted_frame(), "Not an interpreted frame");
485 // These are reasonable sanity checks
486 if (fp() == nullptr || (intptr_t(fp()) & (wordSize-1)) != 0) {
487 return false;
488 }
489 if (sp() == nullptr || (intptr_t(sp()) & (wordSize-1)) != 0) {
490 return false;
491 }
492 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
493 return false;
494 }
495 // These are hacks to keep us out of trouble.
496 // The problem with these is that they mask other problems
497 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
498 return false;
499 }
500
501 // do some validation of frame elements
502 // first the method
503
504 Method* m = safe_interpreter_frame_method();
505
506 // validate the method we'd find in this potential sender
507 if (!Method::is_valid_method(m)) return false;
508
509 // stack frames shouldn't be much larger than max_stack elements
510 // this test requires the use the unextended_sp which is the sp as seen by
511 // the current frame, and not sp which is the "raw" pc which could point
512 // further because of local variables of the callee method inserted after
513 // method arguments
514 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
515 return false;
516 }
517
518 // validate bci/bcp
519
520 address bcp = interpreter_frame_bcp();
521 if (m->validate_bci_from_bcp(bcp) < 0) {
522 return false;
523 }
524
525 // validate ConstantPoolCache*
526 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
527 if (MetaspaceObj::is_valid(cp) == false) return false;
528
529 // validate locals
530
531 address locals = (address)interpreter_frame_locals();
532 return thread->is_in_stack_range_incl(locals, (address)fp());
533 }
534
535 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
536 assert(is_interpreted_frame(), "interpreted frame expected");
537 Method* method = interpreter_frame_method();
538 BasicType type = method->result_type();
539
540 intptr_t* tos_addr;
541 if (method->is_native()) {
542 // Prior to calling into the runtime to report the method_exit the possible
543 // return value is pushed to the native stack. If the result is a jfloat/jdouble
544 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
545 tos_addr = (intptr_t*)sp();
546 if (type == T_FLOAT || type == T_DOUBLE) {
547 // QQQ seems like this code is equivalent on the two platforms
548 #ifdef AMD64
549 // This is times two because we do a push(ltos) after pushing XMM0
550 // and that takes two interpreter stack slots.
551 tos_addr += 2 * Interpreter::stackElementWords;
552 #else
553 tos_addr += 2;
554 #endif // AMD64
555 }
556 } else {
557 tos_addr = (intptr_t*)interpreter_frame_tos_address();
558 }
559
560 switch (type) {
561 case T_OBJECT :
562 case T_ARRAY : {
563 oop obj;
564 if (method->is_native()) {
565 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
566 } else {
567 oop* obj_p = (oop*)tos_addr;
568 obj = (obj_p == nullptr) ? (oop)nullptr : *obj_p;
569 }
570 assert(Universe::is_in_heap_or_null(obj), "sanity check");
571 *oop_result = obj;
572 break;
573 }
574 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
575 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
576 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
577 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
578 case T_INT : value_result->i = *(jint*)tos_addr; break;
579 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
580 case T_FLOAT : {
581 #ifdef AMD64
582 value_result->f = *(jfloat*)tos_addr;
583 #else
584 if (method->is_native()) {
585 jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat
586 value_result->f = (jfloat)d;
587 } else {
588 value_result->f = *(jfloat*)tos_addr;
589 }
590 #endif // AMD64
591 break;
592 }
593 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
594 case T_VOID : /* Nothing to do */ break;
595 default : ShouldNotReachHere();
596 }
597
598 return type;
599 }
600
601 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
602 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
603 return &interpreter_frame_tos_address()[index];
604 }
605
606 #ifndef PRODUCT
607
608 #define DESCRIBE_FP_OFFSET(name) \
609 values.describe(frame_no, fp() + frame::name##_offset, #name, 1)
610
611 void frame::describe_pd(FrameValues& values, int frame_no) {
612 if (is_interpreted_frame()) {
613 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
614 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
615 DESCRIBE_FP_OFFSET(interpreter_frame_method);
616 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
617 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
618 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
619 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
620 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
621 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
622 #ifdef AMD64
623 } else if (is_entry_frame()) {
624 // This could be more descriptive if we use the enum in
625 // stubGenerator to map to real names but it's most important to
626 // claim these frame slots so the error checking works.
627 for (int i = 0; i < entry_frame_after_call_words; i++) {
628 values.describe(frame_no, fp() - i, err_msg("call_stub word fp - %d", i));
629 }
630 #endif // AMD64
631 }
632
633 if (is_java_frame() || Continuation::is_continuation_enterSpecial(*this)) {
634 intptr_t* ret_pc_loc;
635 intptr_t* fp_loc;
636 if (is_interpreted_frame()) {
637 ret_pc_loc = fp() + return_addr_offset;
638 fp_loc = fp();
639 } else {
640 ret_pc_loc = real_fp() - return_addr_offset;
641 fp_loc = real_fp() - sender_sp_offset;
642 }
643 address ret_pc = *(address*)ret_pc_loc;
644 values.describe(frame_no, ret_pc_loc,
645 Continuation::is_return_barrier_entry(ret_pc) ? "return address (return barrier)" : "return address");
646 values.describe(-1, fp_loc, "saved fp", 0); // "unowned" as value belongs to sender
647 }
648 }
649
650 #endif // !PRODUCT
651
652 intptr_t *frame::initial_deoptimization_info() {
653 // used to reset the saved FP
654 return fp();
655 }
656
657 #ifndef PRODUCT
658 // This is a generic constructor which is only used by pns() in debug.cpp.
659 frame::frame(void* sp, void* fp, void* pc) {
660 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
661 }
662
663 #endif
664
665 void JavaFrameAnchor::make_walkable() {
666 // last frame set?
667 if (last_Java_sp() == nullptr) return;
668 // already walkable?
669 if (walkable()) return;
670 vmassert(last_Java_pc() == nullptr, "already walkable");
671 _last_Java_pc = (address)_last_Java_sp[-1];
672 vmassert(walkable(), "something went wrong");
673 }