1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.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/frame.inline.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/javaCalls.hpp"
37 #include "runtime/monitorChunk.hpp"
38 #include "runtime/os.inline.hpp"
39 #include "runtime/signature.hpp"
40 #include "runtime/stackWatermarkSet.hpp"
41 #include "runtime/stubCodeGenerator.hpp"
42 #include "runtime/stubRoutines.hpp"
43 #include "vmreg_aarch64.inline.hpp"
44 #ifdef COMPILER1
45 #include "c1/c1_Runtime1.hpp"
46 #include "runtime/vframeArray.hpp"
47 #endif
48
49 #ifdef ASSERT
check_location_valid()50 void RegisterMap::check_location_valid() {
51 }
52 #endif
53
54
55 // Profiling/safepoint support
56
safe_for_sender(JavaThread * thread)57 bool frame::safe_for_sender(JavaThread *thread) {
58 address sp = (address)_sp;
59 address fp = (address)_fp;
60 address unextended_sp = (address)_unextended_sp;
61
62 // consider stack guards when trying to determine "safe" stack pointers
63 // sp must be within the usable part of the stack (not in guards)
64 if (!thread->is_in_usable_stack(sp)) {
65 return false;
66 }
67
68 // When we are running interpreted code the machine stack pointer, SP, is
69 // set low enough so that the Java expression stack can grow and shrink
70 // without ever exceeding the machine stack bounds. So, ESP >= SP.
71
72 // When we call out of an interpreted method, SP is incremented so that
73 // the space between SP and ESP is removed. The SP saved in the callee's
74 // frame is the SP *before* this increment. So, when we walk a stack of
75 // interpreter frames the sender's SP saved in a frame might be less than
76 // the SP at the point of call.
77
78 // So unextended sp must be within the stack but we need not to check
79 // that unextended sp >= sp
80 if (!thread->is_in_full_stack_checked(unextended_sp)) {
81 return false;
82 }
83
84 // an fp must be within the stack and above (but not equal) sp
85 // second evaluation on fp+ is added to handle situation where fp is -1
86 bool fp_safe = thread->is_in_stack_range_excl(fp, sp) &&
87 thread->is_in_full_stack_checked(fp + (return_addr_offset * sizeof(void*)));
88
89 // We know sp/unextended_sp are safe only fp is questionable here
90
91 // If the current frame is known to the code cache then we can attempt to
92 // to construct the sender and do some validation of it. This goes a long way
93 // toward eliminating issues when we get in frame construction code
94
95 if (_cb != NULL ) {
96
97 // First check if frame is complete and tester is reliable
98 // Unfortunately we can only check frame complete for runtime stubs and nmethod
99 // other generic buffer blobs are more problematic so we just assume they are
100 // ok. adapter blobs never have a frame complete and are never ok.
101
102 if (!_cb->is_frame_complete_at(_pc)) {
103 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
104 return false;
105 }
106 }
107
108 // Could just be some random pointer within the codeBlob
109 if (!_cb->code_contains(_pc)) {
110 return false;
111 }
112
113 // Entry frame checks
114 if (is_entry_frame()) {
115 // an entry frame must have a valid fp.
116 return fp_safe && is_entry_frame_valid(thread);
117 }
118
119 intptr_t* sender_sp = NULL;
120 intptr_t* sender_unextended_sp = NULL;
121 address sender_pc = NULL;
122 intptr_t* saved_fp = NULL;
123
124 if (is_interpreted_frame()) {
125 // fp must be safe
126 if (!fp_safe) {
127 return false;
128 }
129
130 sender_pc = (address) this->fp()[return_addr_offset];
131 // for interpreted frames, the value below is the sender "raw" sp,
132 // which can be different from the sender unextended sp (the sp seen
133 // by the sender) because of current frame local variables
134 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
135 sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
136 saved_fp = (intptr_t*) this->fp()[link_offset];
137
138 } else {
139 // must be some sort of compiled/runtime frame
140 // fp does not have to be safe (although it could be check for c1?)
141
142 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
143 if (_cb->frame_size() <= 0) {
144 return false;
145 }
146
147 sender_sp = _unextended_sp + _cb->frame_size();
148 // Is sender_sp safe?
149 if (!thread->is_in_full_stack_checked((address)sender_sp)) {
150 return false;
151 }
152 sender_unextended_sp = sender_sp;
153 sender_pc = (address) *(sender_sp-1);
154 // Note: frame::sender_sp_offset is only valid for compiled frame
155 saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset);
156 }
157
158
159 // If the potential sender is the interpreter then we can do some more checking
160 if (Interpreter::contains(sender_pc)) {
161
162 // fp is always saved in a recognizable place in any code we generate. However
163 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved fp
164 // is really a frame pointer.
165
166 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
167 return false;
168 }
169
170 // construct the potential sender
171
172 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
173
174 return sender.is_interpreted_frame_valid(thread);
175
176 }
177
178 // We must always be able to find a recognizable pc
179 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
180 if (sender_pc == NULL || sender_blob == NULL) {
181 return false;
182 }
183
184 // Could be a zombie method
185 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
186 return false;
187 }
188
189 // Could just be some random pointer within the codeBlob
190 if (!sender_blob->code_contains(sender_pc)) {
191 return false;
192 }
193
194 // We should never be able to see an adapter if the current frame is something from code cache
195 if (sender_blob->is_adapter_blob()) {
196 return false;
197 }
198
199 // Could be the call_stub
200 if (StubRoutines::returns_to_call_stub(sender_pc)) {
201 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
202 return false;
203 }
204
205 // construct the potential sender
206
207 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
208
209 // Validate the JavaCallWrapper an entry frame must have
210 address jcw = (address)sender.entry_frame_call_wrapper();
211
212 return thread->is_in_stack_range_excl(jcw, (address)sender.fp());
213 }
214
215 CompiledMethod* nm = sender_blob->as_compiled_method_or_null();
216 if (nm != NULL) {
217 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
218 nm->method()->is_method_handle_intrinsic()) {
219 return false;
220 }
221 }
222
223 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
224 // because the return address counts against the callee's frame.
225
226 if (sender_blob->frame_size() <= 0) {
227 assert(!sender_blob->is_compiled(), "should count return address at least");
228 return false;
229 }
230
231 // We should never be able to see anything here except an nmethod. If something in the
232 // code cache (current frame) is called by an entity within the code cache that entity
233 // should not be anything but the call stub (already covered), the interpreter (already covered)
234 // or an nmethod.
235
236 if (!sender_blob->is_compiled()) {
237 return false;
238 }
239
240 // Could put some more validation for the potential non-interpreted sender
241 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
242
243 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
244
245 // We've validated the potential sender that would be created
246 return true;
247 }
248
249 // Must be native-compiled frame. Since sender will try and use fp to find
250 // linkages it must be safe
251
252 if (!fp_safe) {
253 return false;
254 }
255
256 // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
257
258 if ( (address) this->fp()[return_addr_offset] == NULL) return false;
259
260
261 // could try and do some more potential verification of native frame if we could think of some...
262
263 return true;
264
265 }
266
patch_pc(Thread * thread,address pc)267 void frame::patch_pc(Thread* thread, address pc) {
268 assert(_cb == CodeCache::find_blob(pc), "unexpected pc");
269 address* pc_addr = &(((address*) sp())[-1]);
270 if (TracePcPatching) {
271 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
272 p2i(pc_addr), p2i(*pc_addr), p2i(pc));
273 }
274 // Either the return address is the original one or we are going to
275 // patch in the same address that's already there.
276 assert(_pc == *pc_addr || pc == *pc_addr, "must be");
277 *pc_addr = pc;
278 address original_pc = CompiledMethod::get_deopt_original_pc(this);
279 if (original_pc != NULL) {
280 assert(original_pc == _pc, "expected original PC to be stored before patching");
281 _deopt_state = is_deoptimized;
282 // leave _pc as is
283 } else {
284 _deopt_state = not_deoptimized;
285 _pc = pc;
286 }
287 }
288
is_interpreted_frame() const289 bool frame::is_interpreted_frame() const {
290 return Interpreter::contains(pc());
291 }
292
frame_size(RegisterMap * map) const293 int frame::frame_size(RegisterMap* map) const {
294 frame sender = this->sender(map);
295 return sender.sp() - sp();
296 }
297
entry_frame_argument_at(int offset) const298 intptr_t* frame::entry_frame_argument_at(int offset) const {
299 // convert offset to index to deal with tsi
300 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
301 // Entry frame's arguments are always in relation to unextended_sp()
302 return &unextended_sp()[index];
303 }
304
305 // sender_sp
interpreter_frame_sender_sp() const306 intptr_t* frame::interpreter_frame_sender_sp() const {
307 assert(is_interpreted_frame(), "interpreted frame expected");
308 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
309 }
310
set_interpreter_frame_sender_sp(intptr_t * sender_sp)311 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
312 assert(is_interpreted_frame(), "interpreted frame expected");
313 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
314 }
315
316
317 // monitor elements
318
interpreter_frame_monitor_begin() const319 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
320 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
321 }
322
interpreter_frame_monitor_end() const323 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
324 BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
325 // make sure the pointer points inside the frame
326 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
327 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer");
328 return result;
329 }
330
interpreter_frame_set_monitor_end(BasicObjectLock * value)331 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
332 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
333 }
334
335 // Used by template based interpreter deoptimization
interpreter_frame_set_last_sp(intptr_t * sp)336 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
337 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
338 }
339
sender_for_entry_frame(RegisterMap * map) const340 frame frame::sender_for_entry_frame(RegisterMap* map) const {
341 assert(map != NULL, "map must be set");
342 // Java frame called from C; skip all C frames and return top C
343 // frame of that chunk as the sender
344 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
345 assert(!entry_frame_is_first(), "next Java fp must be non zero");
346 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
347 // Since we are walking the stack now this nested anchor is obviously walkable
348 // even if it wasn't when it was stacked.
349 if (!jfa->walkable()) {
350 // Capture _last_Java_pc (if needed) and mark anchor walkable.
351 jfa->capture_last_Java_pc();
352 }
353 map->clear();
354 assert(map->include_argument_oops(), "should be set by clear");
355 vmassert(jfa->last_Java_pc() != NULL, "not walkable");
356 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
357 return fr;
358 }
359
360 //------------------------------------------------------------------------------
361 // frame::verify_deopt_original_pc
362 //
363 // Verifies the calculated original PC of a deoptimization PC for the
364 // given unextended SP.
365 #ifdef ASSERT
verify_deopt_original_pc(CompiledMethod * nm,intptr_t * unextended_sp)366 void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) {
367 frame fr;
368
369 // This is ugly but it's better than to change {get,set}_original_pc
370 // to take an SP value as argument. And it's only a debugging
371 // method anyway.
372 fr._unextended_sp = unextended_sp;
373
374 address original_pc = nm->get_original_pc(&fr);
375 assert(nm->insts_contains_inclusive(original_pc),
376 "original PC must be in the main code section of the the compiled method (or must be immediately following it)");
377 }
378 #endif
379
380 //------------------------------------------------------------------------------
381 // frame::adjust_unextended_sp
adjust_unextended_sp()382 void frame::adjust_unextended_sp() {
383 // On aarch64, sites calling method handle intrinsics and lambda forms are treated
384 // as any other call site. Therefore, no special action is needed when we are
385 // returning to any of these call sites.
386
387 if (_cb != NULL) {
388 CompiledMethod* sender_cm = _cb->as_compiled_method_or_null();
389 if (sender_cm != NULL) {
390 // If the sender PC is a deoptimization point, get the original PC.
391 if (sender_cm->is_deopt_entry(_pc) ||
392 sender_cm->is_deopt_mh_entry(_pc)) {
393 DEBUG_ONLY(verify_deopt_original_pc(sender_cm, _unextended_sp));
394 }
395 }
396 }
397 }
398
399 //------------------------------------------------------------------------------
400 // frame::update_map_with_saved_link
update_map_with_saved_link(RegisterMap * map,intptr_t ** link_addr)401 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
402 // The interpreter and compiler(s) always save fp in a known
403 // location on entry. We must record where that location is
404 // so that if fp was live on callout from c2 we can find
405 // the saved copy no matter what it called.
406
407 // Since the interpreter always saves fp if we record where it is then
408 // we don't have to always save fp on entry and exit to c2 compiled
409 // code, on entry will be enough.
410 map->set_location(rfp->as_VMReg(), (address) link_addr);
411 // this is weird "H" ought to be at a higher address however the
412 // oopMaps seems to have the "H" regs at the same address and the
413 // vanilla register.
414 // XXXX make this go away
415 if (true) {
416 map->set_location(rfp->as_VMReg()->next(), (address) link_addr);
417 }
418 }
419
420
421 //------------------------------------------------------------------------------
422 // frame::sender_for_interpreter_frame
sender_for_interpreter_frame(RegisterMap * map) const423 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
424 // SP is the raw SP from the sender after adapter or interpreter
425 // extension.
426 intptr_t* sender_sp = this->sender_sp();
427
428 // This is the sp before any possible extension (adapter/locals).
429 intptr_t* unextended_sp = interpreter_frame_sender_sp();
430
431 #if COMPILER2_OR_JVMCI
432 if (map->update_map()) {
433 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
434 }
435 #endif // COMPILER2_OR_JVMCI
436
437 return frame(sender_sp, unextended_sp, link(), sender_pc());
438 }
439
440
441 //------------------------------------------------------------------------------
442 // frame::sender_for_compiled_frame
sender_for_compiled_frame(RegisterMap * map) const443 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
444 // we cannot rely upon the last fp having been saved to the thread
445 // in C2 code but it will have been pushed onto the stack. so we
446 // have to find it relative to the unextended sp
447
448 assert(_cb->frame_size() >= 0, "must have non-zero frame size");
449 intptr_t* l_sender_sp = unextended_sp() + _cb->frame_size();
450 intptr_t* unextended_sp = l_sender_sp;
451
452 // the return_address is always the word on the stack
453 address sender_pc = (address) *(l_sender_sp-1);
454
455 intptr_t** saved_fp_addr = (intptr_t**) (l_sender_sp - frame::sender_sp_offset);
456
457 // assert (sender_sp() == l_sender_sp, "should be");
458 // assert (*saved_fp_addr == link(), "should be");
459
460 if (map->update_map()) {
461 // Tell GC to use argument oopmaps for some runtime stubs that need it.
462 // For C1, the runtime stub might not have oop maps, so set this flag
463 // outside of update_register_map.
464 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
465 if (_cb->oop_maps() != NULL) {
466 OopMapSet::update_register_map(this, map);
467 }
468
469 // Since the prolog does the save and restore of FP there is no
470 // oopmap for it so we must fill in its location as if there was
471 // an oopmap entry since if our caller was compiled code there
472 // could be live jvm state in it.
473 update_map_with_saved_link(map, saved_fp_addr);
474 }
475
476 return frame(l_sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
477 }
478
479 //------------------------------------------------------------------------------
480 // frame::sender_raw
sender_raw(RegisterMap * map) const481 frame frame::sender_raw(RegisterMap* map) const {
482 // Default is we done have to follow them. The sender_for_xxx will
483 // update it accordingly
484 map->set_include_argument_oops(false);
485
486 if (is_entry_frame())
487 return sender_for_entry_frame(map);
488 if (is_interpreted_frame())
489 return sender_for_interpreter_frame(map);
490 assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
491
492 // This test looks odd: why is it not is_compiled_frame() ? That's
493 // because stubs also have OOP maps.
494 if (_cb != NULL) {
495 return sender_for_compiled_frame(map);
496 }
497
498 // Must be native-compiled frame, i.e. the marshaling code for native
499 // methods that exists in the core system.
500 return frame(sender_sp(), link(), sender_pc());
501 }
502
sender(RegisterMap * map) const503 frame frame::sender(RegisterMap* map) const {
504 frame result = sender_raw(map);
505
506 if (map->process_frames()) {
507 StackWatermarkSet::on_iteration(map->thread(), result);
508 }
509
510 return result;
511 }
512
is_interpreted_frame_valid(JavaThread * thread) const513 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
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 }
530
531 // do some validation of frame elements
532
533 // first the method
534
535 Method* m = *interpreter_frame_method_addr();
536
537 // validate the method we'd find in this potential sender
538 if (!Method::is_valid_method(m)) return false;
539
540 // stack frames shouldn't be much larger than max_stack elements
541 // this test requires the use of unextended_sp which is the sp as seen by
542 // the current frame, and not sp which is the "raw" pc which could point
543 // further because of local variables of the callee method inserted after
544 // method arguments
545 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
546 return false;
547 }
548
549 // validate bci/bcx
550
551 address bcp = interpreter_frame_bcp();
552 if (m->validate_bci_from_bcp(bcp) < 0) {
553 return false;
554 }
555
556 // validate constantPoolCache*
557 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
558 if (MetaspaceObj::is_valid(cp) == false) return false;
559
560 // validate locals
561
562 address locals = (address) *interpreter_frame_locals_addr();
563 return thread->is_in_stack_range_incl(locals, (address)fp());
564 }
565
interpreter_frame_result(oop * oop_result,jvalue * value_result)566 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
567 assert(is_interpreted_frame(), "interpreted frame expected");
568 Method* method = interpreter_frame_method();
569 BasicType type = method->result_type();
570
571 intptr_t* tos_addr;
572 if (method->is_native()) {
573 // TODO : ensure AARCH64 does the same as Intel here i.e. push v0 then r0
574 // Prior to calling into the runtime to report the method_exit the possible
575 // return value is pushed to the native stack. If the result is a jfloat/jdouble
576 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
577 tos_addr = (intptr_t*)sp();
578 if (type == T_FLOAT || type == T_DOUBLE) {
579 // This is times two because we do a push(ltos) after pushing XMM0
580 // and that takes two interpreter stack slots.
581 tos_addr += 2 * Interpreter::stackElementWords;
582 }
583 } else {
584 tos_addr = (intptr_t*)interpreter_frame_tos_address();
585 }
586
587 switch (type) {
588 case T_OBJECT :
589 case T_ARRAY : {
590 oop obj;
591 if (method->is_native()) {
592 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
593 } else {
594 oop* obj_p = (oop*)tos_addr;
595 obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
596 }
597 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
598 *oop_result = obj;
599 break;
600 }
601 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
602 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
603 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
604 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
605 case T_INT : value_result->i = *(jint*)tos_addr; break;
606 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
607 case T_FLOAT : {
608 value_result->f = *(jfloat*)tos_addr;
609 break;
610 }
611 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
612 case T_VOID : /* Nothing to do */ break;
613 default : ShouldNotReachHere();
614 }
615
616 return type;
617 }
618
619
interpreter_frame_tos_at(jint offset) const620 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
621 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
622 return &interpreter_frame_tos_address()[index];
623 }
624
625 #ifndef PRODUCT
626
627 #define DESCRIBE_FP_OFFSET(name) \
628 values.describe(frame_no, fp() + frame::name##_offset, #name)
629
describe_pd(FrameValues & values,int frame_no)630 void frame::describe_pd(FrameValues& values, int frame_no) {
631 if (is_interpreted_frame()) {
632 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
633 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
634 DESCRIBE_FP_OFFSET(interpreter_frame_method);
635 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
636 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
637 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
638 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
639 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
640 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
641 }
642 }
643 #endif
644
initial_deoptimization_info()645 intptr_t *frame::initial_deoptimization_info() {
646 // Not used on aarch64, but we must return something.
647 return NULL;
648 }
649
real_fp() const650 intptr_t* frame::real_fp() const {
651 if (_cb != NULL) {
652 // use the frame size if valid
653 int size = _cb->frame_size();
654 if (size > 0) {
655 return unextended_sp() + size;
656 }
657 }
658 // else rely on fp()
659 assert(! is_compiled_frame(), "unknown compiled frame size");
660 return fp();
661 }
662
663 #undef DESCRIBE_FP_OFFSET
664
665 #define DESCRIBE_FP_OFFSET(name) \
666 { \
667 uintptr_t *p = (uintptr_t *)fp; \
668 printf(INTPTR_FORMAT " " INTPTR_FORMAT " %s\n", \
669 (uintptr_t)(p + frame::name##_offset), \
670 p[frame::name##_offset], #name); \
671 }
672
673 static THREAD_LOCAL uintptr_t nextfp;
674 static THREAD_LOCAL uintptr_t nextpc;
675 static THREAD_LOCAL uintptr_t nextsp;
676 static THREAD_LOCAL RegisterMap *reg_map;
677
printbc(Method * m,intptr_t bcx)678 static void printbc(Method *m, intptr_t bcx) {
679 const char *name;
680 char buf[16];
681 if (m->validate_bci_from_bcp((address)bcx) < 0
682 || !m->contains((address)bcx)) {
683 name = "???";
684 snprintf(buf, sizeof buf, "(bad)");
685 } else {
686 int bci = m->bci_from((address)bcx);
687 snprintf(buf, sizeof buf, "%d", bci);
688 name = Bytecodes::name(m->code_at(bci));
689 }
690 ResourceMark rm;
691 printf("%s : %s ==> %s\n", m->name_and_sig_as_C_string(), buf, name);
692 }
693
internal_pf(uintptr_t sp,uintptr_t fp,uintptr_t pc,uintptr_t bcx)694 void internal_pf(uintptr_t sp, uintptr_t fp, uintptr_t pc, uintptr_t bcx) {
695 if (! fp)
696 return;
697
698 DESCRIBE_FP_OFFSET(return_addr);
699 DESCRIBE_FP_OFFSET(link);
700 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
701 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
702 DESCRIBE_FP_OFFSET(interpreter_frame_method);
703 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
704 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
705 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
706 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
707 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
708 uintptr_t *p = (uintptr_t *)fp;
709
710 // We want to see all frames, native and Java. For compiled and
711 // interpreted frames we have special information that allows us to
712 // unwind them; for everything else we assume that the native frame
713 // pointer chain is intact.
714 frame this_frame((intptr_t*)sp, (intptr_t*)fp, (address)pc);
715 if (this_frame.is_compiled_frame() ||
716 this_frame.is_interpreted_frame()) {
717 frame sender = this_frame.sender(reg_map);
718 nextfp = (uintptr_t)sender.fp();
719 nextpc = (uintptr_t)sender.pc();
720 nextsp = (uintptr_t)sender.unextended_sp();
721 } else {
722 nextfp = p[frame::link_offset];
723 nextpc = p[frame::return_addr_offset];
724 nextsp = (uintptr_t)&p[frame::sender_sp_offset];
725 }
726
727 if (bcx == -1ULL)
728 bcx = p[frame::interpreter_frame_bcp_offset];
729
730 if (Interpreter::contains((address)pc)) {
731 Method* m = (Method*)p[frame::interpreter_frame_method_offset];
732 if(m && m->is_method()) {
733 printbc(m, bcx);
734 } else
735 printf("not a Method\n");
736 } else {
737 CodeBlob *cb = CodeCache::find_blob((address)pc);
738 if (cb != NULL) {
739 if (cb->is_nmethod()) {
740 ResourceMark rm;
741 nmethod* nm = (nmethod*)cb;
742 printf("nmethod %s\n", nm->method()->name_and_sig_as_C_string());
743 } else if (cb->name()) {
744 printf("CodeBlob %s\n", cb->name());
745 }
746 }
747 }
748 }
749
npf()750 extern "C" void npf() {
751 CodeBlob *cb = CodeCache::find_blob((address)nextpc);
752 // C2 does not always chain the frame pointers when it can, instead
753 // preferring to use fixed offsets from SP, so a simple leave() does
754 // not work. Instead, it adds the frame size to SP then pops FP and
755 // LR. We have to do the same thing to get a good call chain.
756 if (cb && cb->frame_size())
757 nextfp = nextsp + wordSize * (cb->frame_size() - 2);
758 internal_pf (nextsp, nextfp, nextpc, -1);
759 }
760
pf(uintptr_t sp,uintptr_t fp,uintptr_t pc,uintptr_t bcx,uintptr_t thread)761 extern "C" void pf(uintptr_t sp, uintptr_t fp, uintptr_t pc,
762 uintptr_t bcx, uintptr_t thread) {
763 if (!reg_map) {
764 reg_map = NEW_C_HEAP_OBJ(RegisterMap, mtInternal);
765 ::new (reg_map) RegisterMap((JavaThread*)thread, false);
766 } else {
767 *reg_map = RegisterMap((JavaThread*)thread, false);
768 }
769
770 {
771 CodeBlob *cb = CodeCache::find_blob((address)pc);
772 if (cb && cb->frame_size())
773 fp = sp + wordSize * (cb->frame_size() - 2);
774 }
775 internal_pf(sp, fp, pc, bcx);
776 }
777
778 // support for printing out where we are in a Java method
779 // needs to be passed current fp and bcp register values
780 // prints method name, bc index and bytecode name
pm(uintptr_t fp,uintptr_t bcx)781 extern "C" void pm(uintptr_t fp, uintptr_t bcx) {
782 DESCRIBE_FP_OFFSET(interpreter_frame_method);
783 uintptr_t *p = (uintptr_t *)fp;
784 Method* m = (Method*)p[frame::interpreter_frame_method_offset];
785 printbc(m, bcx);
786 }
787
788 #ifndef PRODUCT
789 // This is a generic constructor which is only used by pns() in debug.cpp.
frame(void * sp,void * fp,void * pc)790 frame::frame(void* sp, void* fp, void* pc) {
791 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
792 }
793
pd_ps()794 void frame::pd_ps() {}
795 #endif
796
make_walkable(JavaThread * thread)797 void JavaFrameAnchor::make_walkable(JavaThread* thread) {
798 // last frame set?
799 if (last_Java_sp() == NULL) return;
800 // already walkable?
801 if (walkable()) return;
802 vmassert(Thread::current() == (Thread*)thread, "not current thread");
803 vmassert(last_Java_sp() != NULL, "not called from Java code?");
804 vmassert(last_Java_pc() == NULL, "already walkable");
805 capture_last_Java_pc();
806 vmassert(walkable(), "something went wrong");
807 }
808
capture_last_Java_pc()809 void JavaFrameAnchor::capture_last_Java_pc() {
810 vmassert(_last_Java_sp != NULL, "no last frame set");
811 vmassert(_last_Java_pc == NULL, "already walkable");
812 _last_Java_pc = (address)_last_Java_sp[-1];
813 }
814