1 /*
2 * Copyright (c) 1997, 2025, 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 "compiler/oopMap.hpp"
26 #include "interpreter/interpreter.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "memory/universe.hpp"
29 #include "oops/markWord.hpp"
30 #include "oops/method.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "prims/methodHandles.hpp"
33 #include "runtime/continuation.hpp"
34 #include "runtime/frame.inline.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/javaCalls.hpp"
37 #include "runtime/monitorChunk.hpp"
38 #include "runtime/signature.hpp"
39 #include "runtime/stackWatermarkSet.hpp"
40 #include "runtime/stubCodeGenerator.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "vmreg_x86.inline.hpp"
43 #include "utilities/formatBuffer.hpp"
44 #ifdef COMPILER1
45 #include "c1/c1_Runtime1.hpp"
46 #include "runtime/vframeArray.hpp"
47 #endif
48
49 #ifdef ASSERT
50 void RegisterMap::check_location_valid() {
51 }
52 #endif
53
54 // Profiling/safepoint support
55
56 bool frame::safe_for_sender(JavaThread *thread) {
57 if (is_heap_frame()) {
58 return true;
59 }
60 address sp = (address)_sp;
61 address fp = (address)_fp;
62 address unextended_sp = (address)_unextended_sp;
63
64 // consider stack guards when trying to determine "safe" stack pointers
65 // sp must be within the usable part of the stack (not in guards)
66 if (!thread->is_in_usable_stack(sp)) {
67 return false;
68 }
69
70 // unextended sp must be within the stack
71 // Note: sp can be greater than unextended_sp in the case of
72 // interpreted -> interpreted calls that go through a method handle linker,
73 // since those pop the last argument (the appendix) from the stack.
74 if (!thread->is_in_stack_range_incl(unextended_sp, sp - Interpreter::stackElementSize)) {
75 return false;
76 }
77
78 // an fp must be within the stack and above (but not equal) sp
79 // second evaluation on fp+ is added to handle situation where fp is -1
80 bool fp_safe = thread->is_in_stack_range_excl(fp, sp) &&
81 thread->is_in_full_stack_checked(fp + (return_addr_offset * sizeof(void*)));
82
83 // We know sp/unextended_sp are safe only fp is questionable here
84
85 // If the current frame is known to the code cache then we can attempt to
86 // construct the sender and do some validation of it. This goes a long way
87 // toward eliminating issues when we get in frame construction code
88
89 if (_cb != nullptr ) {
90
91 // First check if frame is complete and tester is reliable
92 // Unfortunately we can only check frame complete for runtime stubs and nmethod
93 // other generic buffer blobs are more problematic so we just assume they are
94 // ok. adapter blobs never have a frame complete and are never ok.
95
96 if (!_cb->is_frame_complete_at(_pc)) {
97 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
98 return false;
99 }
100 }
101
102 // Could just be some random pointer within the codeBlob
103 if (!_cb->code_contains(_pc)) {
104 return false;
105 }
106
107 // Entry frame checks
108 if (is_entry_frame()) {
109 // an entry frame must have a valid fp.
110 return fp_safe && is_entry_frame_valid(thread);
111 } else if (is_upcall_stub_frame()) {
112 return fp_safe;
113 }
114
115 intptr_t* sender_sp = nullptr;
116 intptr_t* sender_unextended_sp = nullptr;
117 address sender_pc = nullptr;
118 intptr_t* saved_fp = nullptr;
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 (!thread->is_in_full_stack_checked((address)sender_sp)) {
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 if (Continuation::is_return_barrier_entry(sender_pc)) {
156 // sender_pc might be invalid so check that the frame
157 // actually belongs to a Continuation.
158 if (!Continuation::is_frame_in_continuation(thread, *this)) {
159 return false;
160 }
161 // If our sender_pc is the return barrier, then our "real" sender is the continuation entry
162 frame s = Continuation::continuation_bottom_sender(thread, *this, sender_sp);
163 sender_sp = s.sp();
164 sender_pc = s.pc();
165 }
166
167 // If the potential sender is the interpreter then we can do some more checking
168 if (Interpreter::contains(sender_pc)) {
169
170 // ebp is always saved in a recognizable place in any code we generate. However
171 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
172 // is really a frame pointer.
173
174 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
175 return false;
176 }
177
178 // construct the potential sender
179
180 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
181
182 return sender.is_interpreted_frame_valid(thread);
183
184 }
185
186 // We must always be able to find a recognizable pc
187 CodeBlob* sender_blob = CodeCache::find_blob(sender_pc);
188 if (sender_pc == nullptr || sender_blob == nullptr) {
189 return false;
190 }
191
192 // Could just be some random pointer within the codeBlob
193 if (!sender_blob->code_contains(sender_pc)) {
194 return false;
195 }
196
197 // We should never be able to see an adapter if the current frame is something from code cache
198 if (sender_blob->is_adapter_blob()) {
199 return false;
200 }
201
202 // Could be the call_stub
203 if (StubRoutines::returns_to_call_stub(sender_pc)) {
204 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
205 return false;
206 }
207
208 // construct the potential sender
209
210 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
211
212 // Validate the JavaCallWrapper an entry frame must have
213 address jcw = (address)sender.entry_frame_call_wrapper();
214
215 return thread->is_in_stack_range_excl(jcw, (address)sender.fp());
216 } else if (sender_blob->is_upcall_stub()) {
217 return false;
218 }
219
220 nmethod* nm = sender_blob->as_nmethod_or_null();
221 if (nm != nullptr) {
222 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
223 nm->method()->is_method_handle_intrinsic()) {
224 return false;
225 }
226 }
227
228 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
229 // because the return address counts against the callee's frame.
230
231 if (sender_blob->frame_size() <= 0) {
232 assert(!sender_blob->is_nmethod(), "should count return address at least");
233 return false;
234 }
235
236 // We should never be able to see anything here except an nmethod. If something in the
237 // code cache (current frame) is called by an entity within the code cache that entity
238 // should not be anything but the call stub (already covered), the interpreter (already covered)
239 // or an nmethod.
240
241 if (!sender_blob->is_nmethod()) {
242 return false;
243 }
244
245 // Could put some more validation for the potential non-interpreted sender
246 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
247
248 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
249
250 // We've validated the potential sender that would be created
251 return true;
252 }
253
254 // Must be native-compiled frame. Since sender will try and use fp to find
255 // linkages it must be safe
256
257 if (!fp_safe) {
258 return false;
259 }
260
261 // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
262
263 if ( (address) this->fp()[return_addr_offset] == nullptr) return false;
264
265
266 // could try and do some more potential verification of native frame if we could think of some...
267
268 return true;
269
270 }
271
272
273 void frame::patch_pc(Thread* thread, address pc) {
274 assert(_cb == CodeCache::find_blob(pc), "unexpected pc");
275 address* pc_addr = &(((address*) sp())[-1]);
276
277 if (TracePcPatching) {
278 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
279 p2i(pc_addr), p2i(*pc_addr), p2i(pc));
280 }
281 // Either the return address is the original one or we are going to
282 // patch in the same address that's already there.
283
284 assert(!Continuation::is_return_barrier_entry(*pc_addr), "return barrier");
285
286 assert(_pc == *pc_addr || pc == *pc_addr || *pc_addr == nullptr, "");
287 DEBUG_ONLY(address old_pc = _pc;)
288 *pc_addr = pc;
289 _pc = pc; // must be set before call to get_deopt_original_pc
290 address original_pc = get_deopt_original_pc();
291 if (original_pc != nullptr) {
292 assert(original_pc == old_pc, "expected original PC to be stored before patching");
293 _deopt_state = is_deoptimized;
294 _pc = original_pc;
295 } else {
296 _deopt_state = not_deoptimized;
297 }
298 assert(!is_compiled_frame() || !_cb->as_nmethod()->is_deopt_entry(_pc), "must be");
299
300 #ifdef ASSERT
301 {
302 frame f(this->sp(), this->unextended_sp(), this->fp(), pc);
303 assert(f.is_deoptimized_frame() == this->is_deoptimized_frame() && f.pc() == this->pc() && f.raw_pc() == this->raw_pc(),
304 "must be (f.is_deoptimized_frame(): %d this->is_deoptimized_frame(): %d "
305 "f.pc(): " INTPTR_FORMAT " this->pc(): " INTPTR_FORMAT " f.raw_pc(): " INTPTR_FORMAT " this->raw_pc(): " INTPTR_FORMAT ")",
306 f.is_deoptimized_frame(), this->is_deoptimized_frame(), p2i(f.pc()), p2i(this->pc()), p2i(f.raw_pc()), p2i(this->raw_pc()));
307 }
308 #endif
309 }
310
311 intptr_t* frame::entry_frame_argument_at(int offset) const {
312 // convert offset to index to deal with tsi
313 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
314 // Entry frame's arguments are always in relation to unextended_sp()
315 return &unextended_sp()[index];
316 }
317
318 // locals
319
320 void frame::interpreter_frame_set_locals(intptr_t* locs) {
321 assert(is_interpreted_frame(), "interpreted frame expected");
322 // set relativized locals
323 ptr_at_put(interpreter_frame_locals_offset, (intptr_t) (locs - fp()));
324 }
325
326 // sender_sp
327
328 intptr_t* frame::interpreter_frame_sender_sp() const {
329 assert(is_interpreted_frame(), "interpreted frame expected");
330 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
331 }
332
333 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
334 assert(is_interpreted_frame(), "interpreted frame expected");
335 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
336 }
337
338
339 // monitor elements
340
341 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
342 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
343 }
344
345 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
346 BasicObjectLock* result = (BasicObjectLock*) at_relative(interpreter_frame_monitor_block_top_offset);
347 // make sure the pointer points inside the frame
348 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
349 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer: result: " INTPTR_FORMAT " fp: " INTPTR_FORMAT, p2i(result), p2i(fp()));
350 return result;
351 }
352
353 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
354 assert(is_interpreted_frame(), "interpreted frame expected");
355 // set relativized monitor_block_top
356 ptr_at_put(interpreter_frame_monitor_block_top_offset, (intptr_t*)value - fp());
357 assert(at_absolute(interpreter_frame_monitor_block_top_offset) <= interpreter_frame_monitor_block_top_offset, "");
358 }
359
360 // Used by template based interpreter deoptimization
361 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
362 assert(is_interpreted_frame(), "interpreted frame expected");
363 // set relativized last_sp
364 ptr_at_put(interpreter_frame_last_sp_offset, sp != nullptr ? (sp - fp()) : 0);
365 }
366
367 frame frame::sender_for_entry_frame(RegisterMap* map) const {
368 assert(map != nullptr, "map must be set");
369 // Java frame called from C; skip all C frames and return top C
370 // frame of that chunk as the sender
371 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
372 assert(!entry_frame_is_first(), "next Java fp must be non zero");
373 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
374 // Since we are walking the stack now this nested anchor is obviously walkable
375 // even if it wasn't when it was stacked.
376 jfa->make_walkable();
377 map->clear();
378 assert(map->include_argument_oops(), "should be set by clear");
379 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
380
381 return fr;
382 }
383
384 UpcallStub::FrameData* UpcallStub::frame_data_for_frame(const frame& frame) const {
385 assert(frame.is_upcall_stub_frame(), "wrong frame");
386 // need unextended_sp here, since normal sp is wrong for interpreter callees
387 return reinterpret_cast<UpcallStub::FrameData*>(
388 reinterpret_cast<address>(frame.unextended_sp()) + in_bytes(_frame_data_offset));
389 }
390
391 bool frame::upcall_stub_frame_is_first() const {
392 assert(is_upcall_stub_frame(), "must be optimzed entry frame");
393 UpcallStub* blob = _cb->as_upcall_stub();
394 JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
395 return jfa->last_Java_sp() == nullptr;
396 }
397
398 frame frame::sender_for_upcall_stub_frame(RegisterMap* map) const {
399 assert(map != nullptr, "map must be set");
400 UpcallStub* blob = _cb->as_upcall_stub();
401 // Java frame called from C; skip all C frames and return top C
402 // frame of that chunk as the sender
403 JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
404 assert(!upcall_stub_frame_is_first(), "must have a frame anchor to go back to");
405 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
406 // Since we are walking the stack now this nested anchor is obviously walkable
407 // even if it wasn't when it was stacked.
408 jfa->make_walkable();
409 map->clear();
410 assert(map->include_argument_oops(), "should be set by clear");
411 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
412
413 return fr;
414 }
415
416 #if defined(ASSERT)
417 static address get_register_address_in_stub(const frame& stub_fr, VMReg reg) {
418 RegisterMap map(nullptr,
419 RegisterMap::UpdateMap::include,
420 RegisterMap::ProcessFrames::skip,
421 RegisterMap::WalkContinuation::skip);
422 stub_fr.oop_map()->update_register_map(&stub_fr, &map);
423 return map.location(reg, stub_fr.sp());
424 }
425 #endif
426
427 JavaThread** frame::saved_thread_address(const frame& f) {
428 CodeBlob* cb = f.cb();
429 assert(cb != nullptr && cb->is_runtime_stub(), "invalid frame");
430
431 JavaThread** thread_addr;
432 #ifdef COMPILER1
433 if (cb == Runtime1::blob_for(C1StubId::monitorenter_id) ||
434 cb == Runtime1::blob_for(C1StubId::monitorenter_nofpu_id)) {
435 thread_addr = (JavaThread**)(f.sp() + Runtime1::runtime_blob_current_thread_offset(f));
436 } else
437 #endif
438 {
439 // c2 only saves rbp in the stub frame so nothing to do.
440 thread_addr = nullptr;
441 }
442 assert(get_register_address_in_stub(f, SharedRuntime::thread_register()) == (address)thread_addr, "wrong thread address");
443 return thread_addr;
444 }
445
446 //------------------------------------------------------------------------------
447 // frame::verify_deopt_original_pc
448 //
449 // Verifies the calculated original PC of a deoptimization PC for the
450 // given unextended SP.
451 #ifdef ASSERT
452 void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp) {
453 frame fr;
454
455 // This is ugly but it's better than to change {get,set}_original_pc
456 // to take an SP value as argument. And it's only a debugging
457 // method anyway.
458 fr._unextended_sp = unextended_sp;
459
460 address original_pc = nm->get_original_pc(&fr);
461 assert(nm->insts_contains_inclusive(original_pc),
462 "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());
463 }
464 #endif
465
466 //------------------------------------------------------------------------------
467 // frame::adjust_unextended_sp
468 #ifdef ASSERT
469 void frame::adjust_unextended_sp() {
470 // On x86, sites calling method handle intrinsics and lambda forms are treated
471 // as any other call site. Therefore, no special action is needed when we are
472 // returning to any of these call sites.
473
474 if (_cb != nullptr) {
475 nmethod* sender_nm = _cb->as_nmethod_or_null();
476 if (sender_nm != nullptr) {
477 // If the sender PC is a deoptimization point, get the original PC.
478 if (sender_nm->is_deopt_entry(_pc) ||
479 sender_nm->is_deopt_mh_entry(_pc)) {
480 verify_deopt_original_pc(sender_nm, _unextended_sp);
481 }
482 }
483 }
484 }
485 #endif
486
487 //------------------------------------------------------------------------------
488 // frame::sender_for_interpreter_frame
489 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
490 // SP is the raw SP from the sender after adapter or interpreter
491 // extension.
492 intptr_t* sender_sp = this->sender_sp();
493
494 // This is the sp before any possible extension (adapter/locals).
495 intptr_t* unextended_sp = interpreter_frame_sender_sp();
496 intptr_t* sender_fp = link();
497
498 #if COMPILER2_OR_JVMCI
499 if (map->update_map()) {
500 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
501 }
502 #endif // COMPILER2_OR_JVMCI
503
504 address sender_pc = this->sender_pc();
505
506 if (Continuation::is_return_barrier_entry(sender_pc)) {
507 if (map->walk_cont()) { // about to walk into an h-stack
508 return Continuation::top_frame(*this, map);
509 } else {
510 return Continuation::continuation_bottom_sender(map->thread(), *this, sender_sp);
511 }
512 }
513
514 return frame(sender_sp, unextended_sp, sender_fp, sender_pc);
515 }
516
517 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
518 assert(is_interpreted_frame(), "Not an interpreted frame");
519 // These are reasonable sanity checks
520 if (fp() == nullptr || (intptr_t(fp()) & (wordSize-1)) != 0) {
521 return false;
522 }
523 if (sp() == nullptr || (intptr_t(sp()) & (wordSize-1)) != 0) {
524 return false;
525 }
526 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
527 return false;
528 }
529 // These are hacks to keep us out of trouble.
530 // The problem with these is that they mask other problems
531 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
532 return false;
533 }
534
535 // do some validation of frame elements
536 // first the method
537
538 Method* m = safe_interpreter_frame_method();
539
540 // validate the method we'd find in this potential sender
541 if (!Method::is_valid_method(m)) return false;
542
543 // stack frames shouldn't be much larger than max_stack elements
544 // this test requires the use the unextended_sp which is the sp as seen by
545 // the current frame, and not sp which is the "raw" pc which could point
546 // further because of local variables of the callee method inserted after
547 // method arguments
548 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
549 return false;
550 }
551
552 // validate bci/bcp
553
554 address bcp = interpreter_frame_bcp();
555 if (m->validate_bci_from_bcp(bcp) < 0) {
556 return false;
557 }
558
559 // validate ConstantPoolCache*
560 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
561 if (MetaspaceObj::is_valid(cp) == false) return false;
562
563 // validate locals
564
565 address locals = (address)interpreter_frame_locals();
566 return thread->is_in_stack_range_incl(locals, (address)fp());
567 }
568
569 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
570 assert(is_interpreted_frame(), "interpreted frame expected");
571 Method* method = interpreter_frame_method();
572 BasicType type = method->result_type();
573
574 intptr_t* tos_addr;
575 if (method->is_native()) {
576 // Prior to calling into the runtime to report the method_exit the possible
577 // return value is pushed to the native stack. If the result is a jfloat/jdouble
578 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
579 tos_addr = (intptr_t*)sp();
580 if (type == T_FLOAT || type == T_DOUBLE) {
581 // QQQ seems like this code is equivalent on the two platforms
582 #ifdef AMD64
583 // This is times two because we do a push(ltos) after pushing XMM0
584 // and that takes two interpreter stack slots.
585 tos_addr += 2 * Interpreter::stackElementWords;
586 #else
587 tos_addr += 2;
588 #endif // AMD64
589 }
590 } else {
591 tos_addr = (intptr_t*)interpreter_frame_tos_address();
592 }
593
594 switch (type) {
595 case T_OBJECT :
596 case T_ARRAY : {
597 oop obj;
598 if (method->is_native()) {
599 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
600 } else {
601 oop* obj_p = (oop*)tos_addr;
602 obj = (obj_p == nullptr) ? (oop)nullptr : *obj_p;
603 }
604 assert(Universe::is_in_heap_or_null(obj), "sanity check");
605 *oop_result = obj;
606 break;
607 }
608 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
609 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
610 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
611 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
612 case T_INT : value_result->i = *(jint*)tos_addr; break;
613 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
614 case T_FLOAT : {
615 #ifdef AMD64
616 value_result->f = *(jfloat*)tos_addr;
617 #else
618 if (method->is_native()) {
619 jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat
620 value_result->f = (jfloat)d;
621 } else {
622 value_result->f = *(jfloat*)tos_addr;
623 }
624 #endif // AMD64
625 break;
626 }
627 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
628 case T_VOID : /* Nothing to do */ break;
629 default : ShouldNotReachHere();
630 }
631
632 return type;
633 }
634
635 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
636 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
637 return &interpreter_frame_tos_address()[index];
638 }
639
640 #ifndef PRODUCT
641
642 #define DESCRIBE_FP_OFFSET(name) \
643 values.describe(frame_no, fp() + frame::name##_offset, #name, 1)
644
645 void frame::describe_pd(FrameValues& values, int frame_no) {
646 if (is_interpreted_frame()) {
647 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
648 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
649 DESCRIBE_FP_OFFSET(interpreter_frame_method);
650 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
651 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
652 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
653 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
654 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
655 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
656 #ifdef AMD64
657 } else if (is_entry_frame()) {
658 // This could be more descriptive if we use the enum in
659 // stubGenerator to map to real names but it's most important to
660 // claim these frame slots so the error checking works.
661 for (int i = 0; i < entry_frame_after_call_words; i++) {
662 values.describe(frame_no, fp() - i, err_msg("call_stub word fp - %d", i));
663 }
664 #endif // AMD64
665 }
666
667 if (is_java_frame() || Continuation::is_continuation_enterSpecial(*this)) {
668 intptr_t* ret_pc_loc;
669 intptr_t* fp_loc;
670 if (is_interpreted_frame()) {
671 ret_pc_loc = fp() + return_addr_offset;
672 fp_loc = fp();
673 } else {
674 ret_pc_loc = real_fp() - return_addr_offset;
675 fp_loc = real_fp() - sender_sp_offset;
676 }
677 address ret_pc = *(address*)ret_pc_loc;
678 values.describe(frame_no, ret_pc_loc,
679 Continuation::is_return_barrier_entry(ret_pc) ? "return address (return barrier)" : "return address");
680 values.describe(-1, fp_loc, "saved fp", 0); // "unowned" as value belongs to sender
681 }
682 }
683
684 #endif // !PRODUCT
685
686 intptr_t *frame::initial_deoptimization_info() {
687 // used to reset the saved FP
688 return fp();
689 }
690
691 #ifndef PRODUCT
692 // This is a generic constructor which is only used by pns() in debug.cpp.
693 frame::frame(void* sp, void* fp, void* pc) {
694 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
695 }
696
697 #endif
698
699 void JavaFrameAnchor::make_walkable() {
700 // last frame set?
701 if (last_Java_sp() == nullptr) return;
702 // already walkable?
703 if (walkable()) return;
704 vmassert(last_Java_pc() == nullptr, "already walkable");
705 _last_Java_pc = (address)_last_Java_sp[-1];
706 vmassert(walkable(), "something went wrong");
707 }