1 /*
2 * Copyright (c) 1997, 2018, 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 "interpreter/interpreter.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "oops/markOop.hpp"
29 #include "oops/method.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "prims/methodHandles.hpp"
32 #include "runtime/frame.inline.hpp"
33 #include "runtime/handles.inline.hpp"
34 #include "runtime/javaCalls.hpp"
35 #include "runtime/monitorChunk.hpp"
36 #include "runtime/os.inline.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubCodeGenerator.hpp"
39 #include "runtime/stubRoutines.hpp"
40 #include "vmreg_x86.inline.hpp"
41 #ifdef COMPILER1
42 #include "c1/c1_Runtime1.hpp"
43 #include "runtime/vframeArray.hpp"
44 #endif
45
46 #ifdef ASSERT
47 void RegisterMap::check_location_valid() {
48 }
49 #endif
50
51 // Profiling/safepoint support
52
53 bool frame::safe_for_sender(JavaThread *thread) {
54 address sp = (address)_sp;
55 address fp = (address)_fp;
56 address unextended_sp = (address)_unextended_sp;
57
58 // consider stack guards when trying to determine "safe" stack pointers
59 static size_t stack_guard_size = os::uses_stack_guard_pages() ?
60 JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_zone_size() : 0;
61 size_t usable_stack_size = thread->stack_size() - stack_guard_size;
62
63 // sp must be within the usable part of the stack (not in guards)
64 bool sp_safe = (sp < thread->stack_base()) &&
65 (sp >= thread->stack_base() - usable_stack_size);
66
67
68 if (!sp_safe) {
69 return false;
70 }
71
72 // unextended sp must be within the stack and above or equal sp
73 bool unextended_sp_safe = (unextended_sp < thread->stack_base()) &&
74 (unextended_sp >= sp);
75
76 if (!unextended_sp_safe) {
77 return false;
78 }
79
80 // an fp must be within the stack and above (but not equal) sp
81 // second evaluation on fp+ is added to handle situation where fp is -1
82 bool fp_safe = (fp < thread->stack_base() && (fp > sp) && (((fp + (return_addr_offset * sizeof(void*))) < thread->stack_base())));
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 // to 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 != NULL ) {
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_compiled() || _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 }
113
114 intptr_t* sender_sp = NULL;
115 intptr_t* sender_unextended_sp = NULL;
116 address sender_pc = NULL;
117 intptr_t* saved_fp = NULL;
118
119 if (is_interpreted_frame()) {
120 // fp must be safe
121 if (!fp_safe) {
122 return false;
123 }
124
125 sender_pc = (address) this->fp()[return_addr_offset];
126 // for interpreted frames, the value below is the sender "raw" sp,
127 // which can be different from the sender unextended sp (the sp seen
128 // by the sender) because of current frame local variables
129 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
130 sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
131 saved_fp = (intptr_t*) this->fp()[link_offset];
132
133 } else {
134 // must be some sort of compiled/runtime frame
135 // fp does not have to be safe (although it could be check for c1?)
136
137 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
138 if (_cb->frame_size() <= 0) {
139 return false;
140 }
141
142 sender_sp = _unextended_sp + _cb->frame_size();
143 // Is sender_sp safe?
144 if ((address)sender_sp >= thread->stack_base()) {
145 return false;
146 }
147 // On Intel the return_address is always the word on the stack
148 sender_pc = (address) *(sender_sp-1);
149 // Note: frame::sender_sp_offset is only valid for compiled frame
150 intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
151 saved_fp = *saved_fp_addr;
152
153 // Repair the sender sp if this is a method with scalarized value type args
154 sender_sp = repair_sender_sp(sender_sp, saved_fp_addr);
155 sender_unextended_sp = sender_sp;
156 }
157
158 // If the potential sender is the interpreter then we can do some more checking
159 if (Interpreter::contains(sender_pc)) {
160
161 // ebp is always saved in a recognizable place in any code we generate. However
162 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
163 // is really a frame pointer.
164
165 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
166
167 if (!saved_fp_safe) {
168 return false;
169 }
170
171 // construct the potential sender
172
173 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
174
175 return sender.is_interpreted_frame_valid(thread);
176
177 }
178
179 // We must always be able to find a recognizable pc
180 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
181 if (sender_pc == NULL || sender_blob == NULL) {
182 return false;
183 }
184
185 // Could be a zombie method
186 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
187 return false;
188 }
189
190 // Could just be some random pointer within the codeBlob
191 if (!sender_blob->code_contains(sender_pc)) {
192 return false;
193 }
194
195 // We should never be able to see an adapter if the current frame is something from code cache
196 if (sender_blob->is_adapter_blob()) {
197 return false;
198 }
199
200 // Could be the call_stub
201 if (StubRoutines::returns_to_call_stub(sender_pc)) {
202 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
203
204 if (!saved_fp_safe) {
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 bool jcw_safe = (jcw < thread->stack_base()) && (jcw > (address)sender.fp());
216
217 return jcw_safe;
218 }
219
220 CompiledMethod* nm = sender_blob->as_compiled_method_or_null();
221 if (nm != NULL) {
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_compiled(), "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_compiled()) {
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] == NULL) 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 address* pc_addr = &(((address*) sp())[-1]);
275 if (TracePcPatching) {
276 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
277 p2i(pc_addr), p2i(*pc_addr), p2i(pc));
278 }
279 // Either the return address is the original one or we are going to
280 // patch in the same address that's already there.
281 assert(_pc == *pc_addr || pc == *pc_addr, "must be");
282 *pc_addr = pc;
283 _cb = CodeCache::find_blob(pc);
284 address original_pc = CompiledMethod::get_deopt_original_pc(this);
285 if (original_pc != NULL) {
286 assert(original_pc == _pc, "expected original PC to be stored before patching");
287 _deopt_state = is_deoptimized;
288 // leave _pc as is
289 } else {
290 _deopt_state = not_deoptimized;
291 _pc = pc;
292 }
293 }
294
295 bool frame::is_interpreted_frame() const {
296 return Interpreter::contains(pc());
297 }
298
299 int frame::frame_size(RegisterMap* map) const {
300 frame sender = this->sender(map);
301 return sender.sp() - sp();
302 }
303
304 intptr_t* frame::entry_frame_argument_at(int offset) const {
305 // convert offset to index to deal with tsi
306 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
307 // Entry frame's arguments are always in relation to unextended_sp()
308 return &unextended_sp()[index];
309 }
310
311 // sender_sp
312
313 intptr_t* frame::interpreter_frame_sender_sp() const {
314 assert(is_interpreted_frame(), "interpreted frame expected");
315 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
316 }
317
318 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
319 assert(is_interpreted_frame(), "interpreted frame expected");
320 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
321 }
322
323
324 // monitor elements
325
326 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
327 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
328 }
329
330 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
331 BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
332 // make sure the pointer points inside the frame
333 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
334 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer");
335 return result;
336 }
337
338 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
339 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
340 }
341
342 // Used by template based interpreter deoptimization
343 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
344 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
345 }
346
347 frame frame::sender_for_entry_frame(RegisterMap* map) const {
348 assert(map != NULL, "map must be set");
349 // Java frame called from C; skip all C frames and return top C
350 // frame of that chunk as the sender
351 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
352 assert(!entry_frame_is_first(), "next Java fp must be non zero");
353 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
354 // Since we are walking the stack now this nested anchor is obviously walkable
355 // even if it wasn't when it was stacked.
356 if (!jfa->walkable()) {
357 // Capture _last_Java_pc (if needed) and mark anchor walkable.
358 jfa->capture_last_Java_pc();
359 }
360 map->clear();
361 assert(map->include_argument_oops(), "should be set by clear");
362 vmassert(jfa->last_Java_pc() != NULL, "not walkable");
363 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
364 return fr;
365 }
366
367 //------------------------------------------------------------------------------
368 // frame::verify_deopt_original_pc
369 //
370 // Verifies the calculated original PC of a deoptimization PC for the
371 // given unextended SP.
372 #ifdef ASSERT
373 void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) {
374 frame fr;
375
376 // This is ugly but it's better than to change {get,set}_original_pc
377 // to take an SP value as argument. And it's only a debugging
378 // method anyway.
379 fr._unextended_sp = unextended_sp;
380
381 address original_pc = nm->get_original_pc(&fr);
382 assert(nm->insts_contains_inclusive(original_pc),
383 "original PC must be in the main code section of the the compiled method (or must be immediately following it)");
384 }
385 #endif
386
387 //------------------------------------------------------------------------------
388 // frame::adjust_unextended_sp
389 #ifdef ASSERT
390 void frame::adjust_unextended_sp() {
391 // On x86, sites calling method handle intrinsics and lambda forms are treated
392 // as any other call site. Therefore, no special action is needed when we are
393 // returning to any of these call sites.
394
395 if (_cb != NULL) {
396 CompiledMethod* sender_cm = _cb->as_compiled_method_or_null();
397 if (sender_cm != NULL) {
398 // If the sender PC is a deoptimization point, get the original PC.
399 if (sender_cm->is_deopt_entry(_pc) ||
400 sender_cm->is_deopt_mh_entry(_pc)) {
401 verify_deopt_original_pc(sender_cm, _unextended_sp);
402 }
403 }
404 }
405 }
406 #endif
407
408 //------------------------------------------------------------------------------
409 // frame::update_map_with_saved_link
410 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
411 // The interpreter and compiler(s) always save EBP/RBP in a known
412 // location on entry. We must record where that location is
413 // so this if EBP/RBP was live on callout from c2 we can find
414 // the saved copy no matter what it called.
415
416 // Since the interpreter always saves EBP/RBP if we record where it is then
417 // we don't have to always save EBP/RBP on entry and exit to c2 compiled
418 // code, on entry will be enough.
419 map->set_location(rbp->as_VMReg(), (address) link_addr);
420 #ifdef AMD64
421 // this is weird "H" ought to be at a higher address however the
422 // oopMaps seems to have the "H" regs at the same address and the
423 // vanilla register.
424 // XXXX make this go away
425 if (true) {
426 map->set_location(rbp->as_VMReg()->next(), (address) link_addr);
427 }
428 #endif // AMD64
429 }
430
431
432 //------------------------------------------------------------------------------
433 // frame::sender_for_interpreter_frame
434 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
435 // SP is the raw SP from the sender after adapter or interpreter
436 // extension.
437 intptr_t* sender_sp = this->sender_sp();
438
439 // This is the sp before any possible extension (adapter/locals).
440 intptr_t* unextended_sp = interpreter_frame_sender_sp();
441
442 #if COMPILER2_OR_JVMCI
443 if (map->update_map()) {
444 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
445 }
446 #endif // COMPILER2_OR_JVMCI
447
448 return frame(sender_sp, unextended_sp, link(), sender_pc());
449 }
450
451
452 //------------------------------------------------------------------------------
453 // frame::sender_for_compiled_frame
454 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
455 assert(map != NULL, "map must be set");
456
457 // frame owned by optimizing compiler
458 assert(_cb->frame_size() >= 0, "must have non-zero frame size");
459 intptr_t* sender_sp = unextended_sp() + _cb->frame_size();
460
461 // On Intel the return_address is always the word on the stack
462 address sender_pc = (address) *(sender_sp-1);
463
464 // This is the saved value of EBP which may or may not really be an FP.
465 // It is only an FP if the sender is an interpreter frame (or C1?).
466 intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
467
468 // Repair the sender sp if this is a method with scalarized value type args
469 sender_sp = repair_sender_sp(sender_sp, saved_fp_addr);
470
471 if (map->update_map()) {
472 // Tell GC to use argument oopmaps for some runtime stubs that need it.
473 // For C1, the runtime stub might not have oop maps, so set this flag
474 // outside of update_register_map.
475 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
476 if (_cb->oop_maps() != NULL) {
477 OopMapSet::update_register_map(this, map);
478 }
479
480 // Since the prolog does the save and restore of EBP there is no oopmap
481 // for it so we must fill in its location as if there was an oopmap entry
482 // since if our caller was compiled code there could be live jvm state in it.
483 update_map_with_saved_link(map, saved_fp_addr);
484 }
485
486 assert(sender_sp != sp(), "must have changed");
487 return frame(sender_sp, sender_sp, *saved_fp_addr, sender_pc);
488 }
489
490
491 //------------------------------------------------------------------------------
492 // frame::sender
493 frame frame::sender(RegisterMap* map) const {
494 // Default is we done have to follow them. The sender_for_xxx will
495 // update it accordingly
496 map->set_include_argument_oops(false);
497
498 if (is_entry_frame()) return sender_for_entry_frame(map);
499 if (is_interpreted_frame()) return sender_for_interpreter_frame(map);
500 assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
501
502 if (_cb != NULL) {
503 return sender_for_compiled_frame(map);
504 }
505 // Must be native-compiled frame, i.e. the marshaling code for native
506 // methods that exists in the core system.
507 return frame(sender_sp(), link(), sender_pc());
508 }
509
510 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
511 assert(is_interpreted_frame(), "Not an interpreted frame");
512 // These are reasonable sanity checks
513 if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
514 return false;
515 }
516 if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
517 return false;
518 }
519 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
520 return false;
521 }
522 // These are hacks to keep us out of trouble.
523 // The problem with these is that they mask other problems
524 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
525 return false;
526 }
527
528 // do some validation of frame elements
529 // first the method
530
531 Method* m = *interpreter_frame_method_addr();
532
533 // validate the method we'd find in this potential sender
534 if (!Method::is_valid_method(m)) return false;
535
536 // stack frames shouldn't be much larger than max_stack elements
537 // this test requires the use the unextended_sp which is the sp as seen by
538 // the current frame, and not sp which is the "raw" pc which could point
539 // further because of local variables of the callee method inserted after
540 // method arguments
541 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
542 return false;
543 }
544
545 // validate bci/bcp
546
547 address bcp = interpreter_frame_bcp();
548 if (m->validate_bci_from_bcp(bcp) < 0) {
549 return false;
550 }
551
552 // validate ConstantPoolCache*
553 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
554 if (cp == NULL || !cp->is_metaspace_object()) return false;
555
556 // validate locals
557
558 address locals = (address) *interpreter_frame_locals_addr();
559
560 if (locals > thread->stack_base() || locals < (address) fp()) return false;
561
562 // We'd have to be pretty unlucky to be mislead at this point
563 return true;
564 }
565
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 // Prior to calling into the runtime to report the method_exit the possible
574 // return value is pushed to the native stack. If the result is a jfloat/jdouble
575 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
576 tos_addr = (intptr_t*)sp();
577 if (type == T_FLOAT || type == T_DOUBLE) {
578 // QQQ seems like this code is equivalent on the two platforms
579 #ifdef AMD64
580 // This is times two because we do a push(ltos) after pushing XMM0
581 // and that takes two interpreter stack slots.
582 tos_addr += 2 * Interpreter::stackElementWords;
583 #else
584 tos_addr += 2;
585 #endif // AMD64
586 }
587 } else {
588 tos_addr = (intptr_t*)interpreter_frame_tos_address();
589 }
590
591 switch (type) {
592 case T_OBJECT :
593 case T_VALUETYPE:
594 case T_ARRAY : {
595 oop obj;
596 if (method->is_native()) {
597 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
598 } else {
599 oop* obj_p = (oop*)tos_addr;
600 obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
601 }
602 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
603 *oop_result = obj;
604 break;
605 }
606 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
607 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
608 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
609 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
610 case T_INT : value_result->i = *(jint*)tos_addr; break;
611 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
612 case T_FLOAT : {
613 #ifdef AMD64
614 value_result->f = *(jfloat*)tos_addr;
615 #else
616 if (method->is_native()) {
617 jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat
618 value_result->f = (jfloat)d;
619 } else {
620 value_result->f = *(jfloat*)tos_addr;
621 }
622 #endif // AMD64
623 break;
624 }
625 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
626 case T_VOID : /* Nothing to do */ break;
627 default : ShouldNotReachHere();
628 }
629
630 return type;
631 }
632
633
634 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
635 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
636 return &interpreter_frame_tos_address()[index];
637 }
638
639 #ifndef PRODUCT
640
641 #define DESCRIBE_FP_OFFSET(name) \
642 values.describe(frame_no, fp() + frame::name##_offset, #name)
643
644 void frame::describe_pd(FrameValues& values, int frame_no) {
645 if (is_interpreted_frame()) {
646 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
647 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
648 DESCRIBE_FP_OFFSET(interpreter_frame_method);
649 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
650 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
651 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
652 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
653 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
654 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
655 #ifdef AMD64
656 } else if (is_entry_frame()) {
657 // This could be more descriptive if we use the enum in
658 // stubGenerator to map to real names but it's most important to
659 // claim these frame slots so the error checking works.
660 for (int i = 0; i < entry_frame_after_call_words; i++) {
661 values.describe(frame_no, fp() - i, err_msg("call_stub word fp - %d", i));
662 }
663 #endif // AMD64
664 }
665 }
666 #endif // !PRODUCT
667
668 intptr_t *frame::initial_deoptimization_info() {
669 // used to reset the saved FP
670 return fp();
671 }
672
673 intptr_t* frame::real_fp() const {
674 if (_cb != NULL) {
675 // use the frame size if valid
676 int size = _cb->frame_size();
677 if (size > 0) {
678 return unextended_sp() + size;
679 }
680 }
681 // else rely on fp()
682 assert(! is_compiled_frame(), "unknown compiled frame size");
683 return fp();
684 }
685
686 #ifndef PRODUCT
687 // This is a generic constructor which is only used by pns() in debug.cpp.
688 frame::frame(void* sp, void* fp, void* pc) {
689 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
690 }
691
692 void frame::pd_ps() {}
693 #endif
694
695 // Check for a method with scalarized value type arguments that needs
696 // a stack repair and return the repaired sender stack pointer.
697 intptr_t* frame::repair_sender_sp(intptr_t* sender_sp, intptr_t** saved_fp_addr) const {
698 CompiledMethod* cm = _cb->as_compiled_method_or_null();
699 if (cm != NULL && cm->method()->needs_stack_repair()) {
700 // The stack increment resides just below the saved rbp on the stack
701 // and does not account for the return address.
702 intptr_t* sp_inc_addr = (intptr_t*) (saved_fp_addr - 1);
703 int sp_inc = (*sp_inc_addr) / wordSize;
704 int real_frame_size = sp_inc + 1; // Add size of return address
705 assert(real_frame_size >= _cb->frame_size(), "invalid frame size");
706 sender_sp = unextended_sp() + real_frame_size;
707 }
708 return sender_sp;
709 }
710
711 void JavaFrameAnchor::make_walkable(JavaThread* thread) {
712 // last frame set?
713 if (last_Java_sp() == NULL) return;
714 // already walkable?
715 if (walkable()) return;
716 vmassert(Thread::current() == (Thread*)thread, "not current thread");
717 vmassert(last_Java_sp() != NULL, "not called from Java code?");
718 vmassert(last_Java_pc() == NULL, "already walkable");
719 capture_last_Java_pc();
720 vmassert(walkable(), "something went wrong");
721 }
722
723 void JavaFrameAnchor::capture_last_Java_pc() {
724 vmassert(_last_Java_sp != NULL, "no last frame set");
725 vmassert(_last_Java_pc == NULL, "already walkable");
726 _last_Java_pc = (address)_last_Java_sp[-1];
727 }