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 // 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 intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
153 saved_fp = *saved_fp_addr;
154
155 // Repair the sender sp if this is a method with scalarized inline type args
156 sender_sp = repair_sender_sp(sender_sp, saved_fp_addr);
157 sender_unextended_sp = sender_sp;
158 }
159 if (Continuation::is_return_barrier_entry(sender_pc)) {
160 // If our sender_pc is the return barrier, then our "real" sender is the continuation entry
161 frame s = Continuation::continuation_bottom_sender(thread, *this, sender_sp);
162 sender_sp = s.sp();
163 sender_pc = s.pc();
164 }
165
166 // If the potential sender is the interpreter then we can do some more checking
167 if (Interpreter::contains(sender_pc)) {
168
169 // ebp is always saved in a recognizable place in any code we generate. However
170 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
171 // is really a frame pointer.
172
173 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
174 return false;
175 }
176
177 // construct the potential sender
178
179 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
180
181 return sender.is_interpreted_frame_valid(thread);
182
183 }
184
185 // We must always be able to find a recognizable pc
186 CodeBlob* sender_blob = CodeCache::find_blob(sender_pc);
187 if (sender_pc == nullptr || sender_blob == nullptr) {
188 return false;
189 }
190
191 // Could just be some random pointer within the codeBlob
192 if (!sender_blob->code_contains(sender_pc)) {
193 return false;
194 }
195
196 // We should never be able to see an adapter if the current frame is something from code cache
197 if (sender_blob->is_adapter_blob()) {
198 return false;
199 }
200
201 // Could be the call_stub
202 if (StubRoutines::returns_to_call_stub(sender_pc)) {
203 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
204 return false;
205 }
206
207 // construct the potential sender
208
209 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
210
211 // Validate the JavaCallWrapper an entry frame must have
212 address jcw = (address)sender.entry_frame_call_wrapper();
213
214 return thread->is_in_stack_range_excl(jcw, (address)sender.fp());
215 } else if (sender_blob->is_upcall_stub()) {
216 return false;
217 }
218
219 nmethod* nm = sender_blob->as_nmethod_or_null();
220 if (nm != nullptr) {
221 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
222 nm->method()->is_method_handle_intrinsic()) {
223 return false;
224 }
225 }
226
227 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
228 // because the return address counts against the callee's frame.
229
230 if (sender_blob->frame_size() <= 0) {
231 assert(!sender_blob->is_nmethod(), "should count return address at least");
232 return false;
233 }
234
235 // We should never be able to see anything here except an nmethod. If something in the
236 // code cache (current frame) is called by an entity within the code cache that entity
237 // should not be anything but the call stub (already covered), the interpreter (already covered)
238 // or an nmethod.
239
240 if (!sender_blob->is_nmethod()) {
241 return false;
242 }
243
244 // Could put some more validation for the potential non-interpreted sender
245 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
246
247 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
248
249 // We've validated the potential sender that would be created
250 return true;
251 }
252
253 // Must be native-compiled frame. Since sender will try and use fp to find
254 // linkages it must be safe
255
256 if (!fp_safe) {
257 return false;
258 }
259
260 // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
261
262 if ( (address) this->fp()[return_addr_offset] == nullptr) return false;
263
264
265 // could try and do some more potential verification of native frame if we could think of some...
266
267 return true;
268
269 }
270
271
272 void frame::patch_pc(Thread* thread, address pc) {
273 assert(_cb == CodeCache::find_blob(pc), "unexpected pc");
274 address* pc_addr = &(((address*) sp())[-1]);
275
276 if (TracePcPatching) {
277 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
278 p2i(pc_addr), p2i(*pc_addr), p2i(pc));
279 }
280 // Either the return address is the original one or we are going to
281 // patch in the same address that's already there.
282
283 assert(!Continuation::is_return_barrier_entry(*pc_addr), "return barrier");
284
285 assert(_pc == *pc_addr || pc == *pc_addr || *pc_addr == nullptr, "");
286 DEBUG_ONLY(address old_pc = _pc;)
287 *pc_addr = pc;
288 _pc = pc; // must be set before call to get_deopt_original_pc
289 address original_pc = get_deopt_original_pc();
290 if (original_pc != nullptr) {
291 assert(original_pc == old_pc, "expected original PC to be stored before patching");
292 _deopt_state = is_deoptimized;
293 _pc = original_pc;
294 } else {
295 _deopt_state = not_deoptimized;
296 }
297 assert(!is_compiled_frame() || !_cb->as_nmethod()->is_deopt_entry(_pc), "must be");
298
299 #ifdef ASSERT
300 {
301 frame f(this->sp(), this->unextended_sp(), this->fp(), pc);
302 assert(f.is_deoptimized_frame() == this->is_deoptimized_frame() && f.pc() == this->pc() && f.raw_pc() == this->raw_pc(),
303 "must be (f.is_deoptimized_frame(): %d this->is_deoptimized_frame(): %d "
304 "f.pc(): " INTPTR_FORMAT " this->pc(): " INTPTR_FORMAT " f.raw_pc(): " INTPTR_FORMAT " this->raw_pc(): " INTPTR_FORMAT ")",
305 f.is_deoptimized_frame(), this->is_deoptimized_frame(), p2i(f.pc()), p2i(this->pc()), p2i(f.raw_pc()), p2i(this->raw_pc()));
306 }
307 #endif
308 }
309
310 intptr_t* frame::entry_frame_argument_at(int offset) const {
311 // convert offset to index to deal with tsi
312 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
313 // Entry frame's arguments are always in relation to unextended_sp()
314 return &unextended_sp()[index];
315 }
316
317 // locals
318
319 void frame::interpreter_frame_set_locals(intptr_t* locs) {
320 assert(is_interpreted_frame(), "interpreted frame expected");
321 // set relativized locals
322 ptr_at_put(interpreter_frame_locals_offset, (intptr_t) (locs - fp()));
323 }
324
325 // sender_sp
326
327 intptr_t* frame::interpreter_frame_sender_sp() const {
328 assert(is_interpreted_frame(), "interpreted frame expected");
329 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
330 }
331
332 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
333 assert(is_interpreted_frame(), "interpreted frame expected");
334 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
335 }
336
337
338 // monitor elements
339
340 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
341 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
342 }
343
344 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
345 BasicObjectLock* result = (BasicObjectLock*) at_relative(interpreter_frame_monitor_block_top_offset);
346 // make sure the pointer points inside the frame
347 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
348 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer: result: " INTPTR_FORMAT " fp: " INTPTR_FORMAT, p2i(result), p2i(fp()));
349 return result;
350 }
351
352 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
353 assert(is_interpreted_frame(), "interpreted frame expected");
354 // set relativized monitor_block_top
355 ptr_at_put(interpreter_frame_monitor_block_top_offset, (intptr_t*)value - fp());
356 assert(at_absolute(interpreter_frame_monitor_block_top_offset) <= interpreter_frame_monitor_block_top_offset, "");
357 }
358
359 // Used by template based interpreter deoptimization
360 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
361 assert(is_interpreted_frame(), "interpreted frame expected");
362 // set relativized last_sp
363 ptr_at_put(interpreter_frame_last_sp_offset, sp != nullptr ? (sp - fp()) : 0);
364 }
365
366 frame frame::sender_for_entry_frame(RegisterMap* map) const {
367 assert(map != nullptr, "map must be set");
368 // Java frame called from C; skip all C frames and return top C
369 // frame of that chunk as the sender
370 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
371 assert(!entry_frame_is_first(), "next Java fp must be non zero");
372 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
373 // Since we are walking the stack now this nested anchor is obviously walkable
374 // even if it wasn't when it was stacked.
375 jfa->make_walkable();
376 map->clear();
377 assert(map->include_argument_oops(), "should be set by clear");
378 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
379
380 return fr;
381 }
382
383 UpcallStub::FrameData* UpcallStub::frame_data_for_frame(const frame& frame) const {
384 assert(frame.is_upcall_stub_frame(), "wrong frame");
385 // need unextended_sp here, since normal sp is wrong for interpreter callees
386 return reinterpret_cast<UpcallStub::FrameData*>(
387 reinterpret_cast<address>(frame.unextended_sp()) + in_bytes(_frame_data_offset));
388 }
389
390 bool frame::upcall_stub_frame_is_first() const {
391 assert(is_upcall_stub_frame(), "must be optimzed entry frame");
392 UpcallStub* blob = _cb->as_upcall_stub();
393 JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
394 return jfa->last_Java_sp() == nullptr;
395 }
396
397 frame frame::sender_for_upcall_stub_frame(RegisterMap* map) const {
398 assert(map != nullptr, "map must be set");
399 UpcallStub* blob = _cb->as_upcall_stub();
400 // Java frame called from C; skip all C frames and return top C
401 // frame of that chunk as the sender
402 JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
403 assert(!upcall_stub_frame_is_first(), "must have a frame anchor to go back to");
404 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
405 // Since we are walking the stack now this nested anchor is obviously walkable
406 // even if it wasn't when it was stacked.
407 jfa->make_walkable();
408 map->clear();
409 assert(map->include_argument_oops(), "should be set by clear");
410 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
411
412 return fr;
413 }
414
415 //------------------------------------------------------------------------------
416 // frame::verify_deopt_original_pc
417 //
418 // Verifies the calculated original PC of a deoptimization PC for the
419 // given unextended SP.
420 #ifdef ASSERT
421 void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp) {
422 frame fr;
423
424 // This is ugly but it's better than to change {get,set}_original_pc
425 // to take an SP value as argument. And it's only a debugging
426 // method anyway.
427 fr._unextended_sp = unextended_sp;
428
429 address original_pc = nm->get_original_pc(&fr);
430 assert(nm->insts_contains_inclusive(original_pc),
431 "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());
432 }
433 #endif
434
435 //------------------------------------------------------------------------------
436 // frame::adjust_unextended_sp
437 #ifdef ASSERT
438 void frame::adjust_unextended_sp() {
439 // On x86, sites calling method handle intrinsics and lambda forms are treated
440 // as any other call site. Therefore, no special action is needed when we are
441 // returning to any of these call sites.
442
443 if (_cb != nullptr) {
444 nmethod* sender_nm = _cb->as_nmethod_or_null();
445 if (sender_nm != nullptr) {
446 // If the sender PC is a deoptimization point, get the original PC.
447 if (sender_nm->is_deopt_entry(_pc) ||
448 sender_nm->is_deopt_mh_entry(_pc)) {
449 verify_deopt_original_pc(sender_nm, _unextended_sp);
450 }
451 }
452 }
453 }
454 #endif
455
456 //------------------------------------------------------------------------------
457 // frame::sender_for_interpreter_frame
458 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
459 // SP is the raw SP from the sender after adapter or interpreter
460 // extension.
461 intptr_t* sender_sp = this->sender_sp();
462
463 // This is the sp before any possible extension (adapter/locals).
464 intptr_t* unextended_sp = interpreter_frame_sender_sp();
465 intptr_t* sender_fp = link();
466
467 #if COMPILER2_OR_JVMCI
468 if (map->update_map()) {
469 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
470 }
471 #endif // COMPILER2_OR_JVMCI
472
473 address sender_pc = this->sender_pc();
474
475 if (Continuation::is_return_barrier_entry(sender_pc)) {
476 if (map->walk_cont()) { // about to walk into an h-stack
477 return Continuation::top_frame(*this, map);
478 } else {
479 return Continuation::continuation_bottom_sender(map->thread(), *this, sender_sp);
480 }
481 }
482
483 return frame(sender_sp, unextended_sp, sender_fp, sender_pc);
484 }
485
486 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
487 assert(is_interpreted_frame(), "Not an interpreted frame");
488 // These are reasonable sanity checks
489 if (fp() == nullptr || (intptr_t(fp()) & (wordSize-1)) != 0) {
490 return false;
491 }
492 if (sp() == nullptr || (intptr_t(sp()) & (wordSize-1)) != 0) {
493 return false;
494 }
495 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
496 return false;
497 }
498 // These are hacks to keep us out of trouble.
499 // The problem with these is that they mask other problems
500 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
501 return false;
502 }
503
504 // do some validation of frame elements
505 // first the method
506
507 Method* m = safe_interpreter_frame_method();
508
509 // validate the method we'd find in this potential sender
510 if (!Method::is_valid_method(m)) return false;
511
512 // stack frames shouldn't be much larger than max_stack elements
513 // this test requires the use the unextended_sp which is the sp as seen by
514 // the current frame, and not sp which is the "raw" pc which could point
515 // further because of local variables of the callee method inserted after
516 // method arguments
517 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
518 return false;
519 }
520
521 // validate bci/bcp
522
523 address bcp = interpreter_frame_bcp();
524 if (m->validate_bci_from_bcp(bcp) < 0) {
525 return false;
526 }
527
528 // validate ConstantPoolCache*
529 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
530 if (MetaspaceObj::is_valid(cp) == false) return false;
531
532 // validate locals
533
534 address locals = (address)interpreter_frame_locals();
535 return thread->is_in_stack_range_incl(locals, (address)fp());
536 }
537
538 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
539 assert(is_interpreted_frame(), "interpreted frame expected");
540 Method* method = interpreter_frame_method();
541 BasicType type = method->result_type();
542
543 intptr_t* tos_addr;
544 if (method->is_native()) {
545 // Prior to calling into the runtime to report the method_exit the possible
546 // return value is pushed to the native stack. If the result is a jfloat/jdouble
547 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
548 tos_addr = (intptr_t*)sp();
549 if (type == T_FLOAT || type == T_DOUBLE) {
550 // QQQ seems like this code is equivalent on the two platforms
551 #ifdef AMD64
552 // This is times two because we do a push(ltos) after pushing XMM0
553 // and that takes two interpreter stack slots.
554 tos_addr += 2 * Interpreter::stackElementWords;
555 #else
556 tos_addr += 2;
557 #endif // AMD64
558 }
559 } else {
560 tos_addr = (intptr_t*)interpreter_frame_tos_address();
561 }
562
563 switch (type) {
564 case T_OBJECT :
565 case T_ARRAY : {
566 oop obj;
567 if (method->is_native()) {
568 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
569 } else {
570 oop* obj_p = (oop*)tos_addr;
571 obj = (obj_p == nullptr) ? (oop)nullptr : *obj_p;
572 }
573 assert(Universe::is_in_heap_or_null(obj), "sanity check");
574 *oop_result = obj;
575 break;
576 }
577 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
578 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
579 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
580 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
581 case T_INT : value_result->i = *(jint*)tos_addr; break;
582 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
583 case T_FLOAT : {
584 #ifdef AMD64
585 value_result->f = *(jfloat*)tos_addr;
586 #else
587 if (method->is_native()) {
588 jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat
589 value_result->f = (jfloat)d;
590 } else {
591 value_result->f = *(jfloat*)tos_addr;
592 }
593 #endif // AMD64
594 break;
595 }
596 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
597 case T_VOID : /* Nothing to do */ break;
598 default : ShouldNotReachHere();
599 }
600
601 return type;
602 }
603
604 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
605 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
606 return &interpreter_frame_tos_address()[index];
607 }
608
609 #ifndef PRODUCT
610
611 #define DESCRIBE_FP_OFFSET(name) \
612 values.describe(frame_no, fp() + frame::name##_offset, #name, 1)
613
614 void frame::describe_pd(FrameValues& values, int frame_no) {
615 if (is_interpreted_frame()) {
616 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
617 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
618 DESCRIBE_FP_OFFSET(interpreter_frame_method);
619 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
620 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
621 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
622 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
623 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
624 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
625 #ifdef AMD64
626 } else if (is_entry_frame()) {
627 // This could be more descriptive if we use the enum in
628 // stubGenerator to map to real names but it's most important to
629 // claim these frame slots so the error checking works.
630 for (int i = 0; i < entry_frame_after_call_words; i++) {
631 values.describe(frame_no, fp() - i, err_msg("call_stub word fp - %d", i));
632 }
633 #endif // AMD64
634 }
635
636 if (is_java_frame() || Continuation::is_continuation_enterSpecial(*this)) {
637 intptr_t* ret_pc_loc;
638 intptr_t* fp_loc;
639 if (is_interpreted_frame()) {
640 ret_pc_loc = fp() + return_addr_offset;
641 fp_loc = fp();
642 } else {
643 ret_pc_loc = real_fp() - return_addr_offset;
644 fp_loc = real_fp() - sender_sp_offset;
645 }
646 address ret_pc = *(address*)ret_pc_loc;
647 values.describe(frame_no, ret_pc_loc,
648 Continuation::is_return_barrier_entry(ret_pc) ? "return address (return barrier)" : "return address");
649 values.describe(-1, fp_loc, "saved fp", 0); // "unowned" as value belongs to sender
650 }
651 }
652
653 #endif // !PRODUCT
654
655 intptr_t *frame::initial_deoptimization_info() {
656 // used to reset the saved FP
657 return fp();
658 }
659
660 #ifndef PRODUCT
661 // This is a generic constructor which is only used by pns() in debug.cpp.
662 frame::frame(void* sp, void* fp, void* pc) {
663 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
664 }
665
666 #endif
667
668 // Check for a method with scalarized inline type arguments that needs
669 // a stack repair and return the repaired sender stack pointer.
670 intptr_t* frame::repair_sender_sp(intptr_t* sender_sp, intptr_t** saved_fp_addr) const {
671 nmethod* nm = _cb->as_nmethod_or_null();
672 if (nm != nullptr && nm->needs_stack_repair()) {
673 // The stack increment resides just below the saved rbp on the stack
674 // and does not account for the return address.
675 intptr_t* real_frame_size_addr = (intptr_t*) (saved_fp_addr - 1);
676 int real_frame_size = ((*real_frame_size_addr) + wordSize) / wordSize;
677 assert(real_frame_size >= _cb->frame_size() && real_frame_size <= 1000000, "invalid frame size");
678 sender_sp = unextended_sp() + real_frame_size;
679 }
680 return sender_sp;
681 }
682
683 void JavaFrameAnchor::make_walkable() {
684 // last frame set?
685 if (last_Java_sp() == nullptr) return;
686 // already walkable?
687 if (walkable()) return;
688 vmassert(last_Java_pc() == nullptr, "already walkable");
689 _last_Java_pc = (address)_last_Java_sp[-1];
690 vmassert(walkable(), "something went wrong");
691 }