1 /*
2 * Copyright (c) 1997, 2017, 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/continuation.hpp"
33 #include "runtime/frame.inline.hpp"
34 #include "runtime/handles.inline.hpp"
35 #include "runtime/javaCalls.hpp"
36 #include "runtime/monitorChunk.hpp"
37 #include "runtime/os.inline.hpp"
38 #include "runtime/signature.hpp"
39 #include "runtime/stubCodeGenerator.hpp"
40 #include "runtime/stubRoutines.hpp"
41 #include "vmreg_x86.inline.hpp"
42 #ifdef COMPILER1
43 #include "c1/c1_Runtime1.hpp"
44 #include "runtime/vframeArray.hpp"
45 #endif
46
47 #ifdef ASSERT
48 void RegisterMap::check_location_valid() {
49 }
50 #endif
51
52 // Profiling/safepoint support
53
54 bool frame::safe_for_sender(JavaThread *thread) {
55 address sp = (address)_sp;
56 address fp = (address)_fp;
57 address unextended_sp = (address)_unextended_sp;
58
59 // consider stack guards when trying to determine "safe" stack pointers
60 static size_t stack_guard_size = os::uses_stack_guard_pages() ?
61 JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_zone_size() : 0;
62 size_t usable_stack_size = thread->stack_size() - stack_guard_size;
63
64 // sp must be within the usable part of the stack (not in guards)
65 bool sp_safe = (sp < thread->stack_base()) &&
66 (sp >= thread->stack_base() - usable_stack_size);
67
68
69 if (!sp_safe) {
70 return false;
71 }
72
73 // unextended sp must be within the stack and above or equal sp
74 bool unextended_sp_safe = (unextended_sp < thread->stack_base()) &&
75 (unextended_sp >= sp);
76
77 if (!unextended_sp_safe) {
78 return false;
79 }
80
81 // an fp must be within the stack and above (but not equal) sp
82 // second evaluation on fp+ is added to handle situation where fp is -1
83 bool fp_safe = (fp < thread->stack_base() && (fp > sp) && (((fp + (return_addr_offset * sizeof(void*))) < thread->stack_base())));
84
85 // We know sp/unextended_sp are safe only fp is questionable here
86
87 // If the current frame is known to the code cache then we can attempt to
88 // to construct the sender and do some validation of it. This goes a long way
89 // toward eliminating issues when we get in frame construction code
90
91 if (_cb != NULL ) {
92
93 // First check if frame is complete and tester is reliable
94 // Unfortunately we can only check frame complete for runtime stubs and nmethod
95 // other generic buffer blobs are more problematic so we just assume they are
96 // ok. adapter blobs never have a frame complete and are never ok.
97
98 if (!_cb->is_frame_complete_at(_pc)) {
99 if (_cb->is_compiled() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
100 return false;
101 }
102 }
103
104 // Could just be some random pointer within the codeBlob
105 if (!_cb->code_contains(_pc)) {
106 return false;
107 }
108
109 // Entry frame checks
110 if (is_entry_frame()) {
111 // an entry frame must have a valid fp.
112 return fp_safe && is_entry_frame_valid(thread);
113 }
114
115 intptr_t* sender_sp = NULL;
116 intptr_t* sender_unextended_sp = NULL;
117 address sender_pc = NULL;
118 intptr_t* saved_fp = NULL;
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 ((address)sender_sp >= thread->stack_base()) {
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
156 // If the potential sender is the interpreter then we can do some more checking
157 if (Interpreter::contains(sender_pc)) {
158
159 // ebp is always saved in a recognizable place in any code we generate. However
160 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
161 // is really a frame pointer.
162
163 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
164
165 if (!saved_fp_safe) {
166 return false;
167 }
168
169 // construct the potential sender
170
171 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
172
173 return sender.is_interpreted_frame_valid(thread);
174
175 }
176
177 // We must always be able to find a recognizable pc
178 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
179 if (sender_pc == NULL || sender_blob == NULL) {
180 return false;
181 }
182
183 // Could be a zombie method
184 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
185 return false;
186 }
187
188 // Could just be some random pointer within the codeBlob
189 if (!sender_blob->code_contains(sender_pc)) {
190 return false;
191 }
192
193 // We should never be able to see an adapter if the current frame is something from code cache
194 if (sender_blob->is_adapter_blob()) {
195 return false;
196 }
197
198 // Could be the call_stub
199 if (StubRoutines::returns_to_call_stub(sender_pc)) {
200 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
201
202 if (!saved_fp_safe) {
203 return false;
204 }
205
206 // construct the potential sender
207
208 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
209
210 // Validate the JavaCallWrapper an entry frame must have
211 address jcw = (address)sender.entry_frame_call_wrapper();
212
213 bool jcw_safe = (jcw < thread->stack_base()) && (jcw > (address)sender.fp());
214
215 return jcw_safe;
216 }
217
218 CompiledMethod* nm = sender_blob->as_compiled_method_or_null();
219 if (nm != NULL) {
220 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
221 nm->method()->is_method_handle_intrinsic()) {
222 return false;
223 }
224 }
225
226 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
227 // because the return address counts against the callee's frame.
228
229 if (sender_blob->frame_size() <= 0) {
230 assert(!sender_blob->is_compiled(), "should count return address at least");
231 return false;
232 }
233
234 // We should never be able to see anything here except an nmethod. If something in the
235 // code cache (current frame) is called by an entity within the code cache that entity
236 // should not be anything but the call stub (already covered), the interpreter (already covered)
237 // or an nmethod.
238
239 if (!sender_blob->is_compiled()) {
240 return false;
241 }
242
243 // Could put some more validation for the potential non-interpreted sender
244 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
245
246 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
247
248 // We've validated the potential sender that would be created
249 return true;
250 }
251
252 // Must be native-compiled frame. Since sender will try and use fp to find
253 // linkages it must be safe
254
255 if (!fp_safe) {
256 return false;
257 }
258
259 // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
260
261 if ( (address) this->fp()[return_addr_offset] == NULL) return false;
262
263
264 // could try and do some more potential verification of native frame if we could think of some...
265
266 return true;
267
268 }
269
270
271 void frame::patch_pc(Thread* thread, address pc) {
272 address* pc_addr = &(((address*) sp())[-1]);
273 if (TracePcPatching) {
274 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
275 p2i(pc_addr), p2i(*pc_addr), p2i(pc));
276 }
277 // Either the return address is the original one or we are going to
278 // patch in the same address that's already there.
279 assert(!Continuation::is_return_barrier_entry(*pc_addr), "return barrier");
280 // #ifdef ASSERT
281 // bool good = (_pc == *pc_addr || pc == *pc_addr);
282 // if (!good) {
283 // tty->print_cr("pc: %p", pc); os::print_location(tty, *(intptr_t*)&pc);
284 // tty->print_cr("_pc: %p", _pc); os::print_location(tty, *(intptr_t*)&_pc);
285 // tty->print_cr("*pc_addr: %p", *pc_addr); os::print_location(tty, *(intptr_t*)pc_addr);
286 // }
287 // #endif
288 assert(_pc == *pc_addr || pc == *pc_addr, "must be (pc: %p _pc: %p *pc_addr: %p)", pc, _pc, *pc_addr);
289 *pc_addr = pc;
290 _cb = CodeCache::find_blob(pc);
291 address original_pc = CompiledMethod::get_deopt_original_pc(this);
292 // #ifdef ASSERT
293 // if (!good) {
294 // tty->print_cr("_pc: %p original_pc: %p", _pc, original_pc);
295 // CompiledMethod* cm = _cb->as_compiled_method_or_null();
296 // tty->print_cr("_pc: %p is_deopt _pc: %d is_deopt pc: %d", _pc, cm->is_deopt_pc(_pc), cm->is_deopt_pc(pc));
297 // }
298 // #endif
299 if (original_pc != NULL) {
300 assert(original_pc == _pc, "expected original PC to be stored before patching");
301 _deopt_state = is_deoptimized;
302 // leave _pc as is
303 } else {
304 _deopt_state = not_deoptimized;
305 _pc = pc;
306 }
307 }
308
309 bool frame::is_interpreted_frame() const {
310 return Interpreter::contains(pc());
311 }
312
313 int frame::frame_size(RegisterMap* map) const {
314 frame sender = this->sender(map);
315 return sender.sp() - sp();
316 }
317
318 intptr_t* frame::entry_frame_argument_at(int offset) const {
319 // convert offset to index to deal with tsi
320 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
321 // Entry frame's arguments are always in relation to unextended_sp()
322 return &unextended_sp()[index];
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*) *addr_at(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: %p fp: %p", result, fp());
349 return result;
350 }
351
352 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
353 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
354 }
355
356 // Used by template based interpreter deoptimization
357 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
358 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
359 }
360
361 frame frame::sender_for_entry_frame(RegisterMap* map) const {
362 assert(map != NULL, "map must be set");
363 // Java frame called from C; skip all C frames and return top C
364 // frame of that chunk as the sender
365 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
366 assert(!entry_frame_is_first(), "next Java fp must be non zero");
367 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
368 // Since we are walking the stack now this nested anchor is obviously walkable
369 // even if it wasn't when it was stacked.
370 if (!jfa->walkable()) {
371 // Capture _last_Java_pc (if needed) and mark anchor walkable.
372 jfa->capture_last_Java_pc();
373 }
374 map->clear();
375 assert(map->include_argument_oops(), "should be set by clear");
376 vmassert(jfa->last_Java_pc() != NULL, "not walkable");
377 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
378 return fr;
379 }
380
381 //------------------------------------------------------------------------------
382 // frame::verify_deopt_original_pc
383 //
384 // Verifies the calculated original PC of a deoptimization PC for the
385 // given unextended SP.
386 #ifdef ASSERT
387 void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) {
388 frame fr;
389
390 // This is ugly but it's better than to change {get,set}_original_pc
391 // to take an SP value as argument. And it's only a debugging
392 // method anyway.
393 fr._unextended_sp = unextended_sp;
394
395 address original_pc = nm->get_original_pc(&fr);
396 assert(nm->insts_contains_inclusive(original_pc),
397 "original PC must be in the main code section of the the compiled method (or must be immediately following it) original_pc: %p unextended_sp: %p name: %s", original_pc, unextended_sp, nm->name());
398 }
399 #endif
400
401 //------------------------------------------------------------------------------
402 // frame::adjust_unextended_sp
403 #ifdef ASSERT
404 void frame::adjust_unextended_sp() {
405 // On x86, sites calling method handle intrinsics and lambda forms are treated
406 // as any other call site. Therefore, no special action is needed when we are
407 // returning to any of these call sites.
408
409 if (_cb != NULL) {
410 CompiledMethod* sender_cm = _cb->as_compiled_method_or_null();
411 if (sender_cm != NULL) {
412 // If the sender PC is a deoptimization point, get the original PC.
413 if (sender_cm->is_deopt_entry(_pc) ||
414 sender_cm->is_deopt_mh_entry(_pc)) {
415 verify_deopt_original_pc(sender_cm, _unextended_sp);
416 }
417 }
418 }
419 }
420 #endif
421
422 //------------------------------------------------------------------------------
423 // frame::update_map_with_saved_link
424 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
425 // The interpreter and compiler(s) always save EBP/RBP in a known
426 // location on entry. We must record where that location is
427 // so this if EBP/RBP was live on callout from c2 we can find
428 // the saved copy no matter what it called.
429
430 // Since the interpreter always saves EBP/RBP if we record where it is then
431 // we don't have to always save EBP/RBP on entry and exit to c2 compiled
432 // code, on entry will be enough.
433 map->set_location(rbp->as_VMReg(), (address) link_addr);
434 #ifdef AMD64
435 // this is weird "H" ought to be at a higher address however the
436 // oopMaps seems to have the "H" regs at the same address and the
437 // vanilla register.
438 // XXXX make this go away
439 if (true) {
440 map->set_location(rbp->as_VMReg()->next(), (address) link_addr);
441 }
442 #endif // AMD64
443 }
444
445 intptr_t** frame::saved_link_address(RegisterMap* map) {
446 return (intptr_t**)map->location(rbp->as_VMReg());
447 }
448
449
450 //------------------------------------------------------------------------------
451 // frame::sender_for_interpreter_frame
452 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
453 // SP is the raw SP from the sender after adapter or interpreter
454 // extension.
455 intptr_t* sender_sp = this->sender_sp();
456
457 // This is the sp before any possible extension (adapter/locals).
458 intptr_t* unextended_sp = interpreter_frame_sender_sp();
459
460 #if COMPILER2_OR_JVMCI
461 if (map->update_map()) {
462 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
463 }
464 #endif // COMPILER2_OR_JVMCI
465
466 return frame(sender_sp, unextended_sp, link(), sender_pc());
467 }
468
469
470 //------------------------------------------------------------------------------
471 // frame::sender_for_compiled_frame
472 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
473 assert(map != NULL, "map must be set");
474
475 // frame owned by optimizing compiler
476 assert(_cb->frame_size() >= 0, "must have non-zero frame size");
477 intptr_t* sender_sp = unextended_sp() + _cb->frame_size();
478 intptr_t* unextended_sp = sender_sp;
479
480 assert (sender_sp == real_fp(), "sender_sp: %p real_fp: %p", sender_sp, real_fp());
481
482 // On Intel the return_address is always the word on the stack
483 address sender_pc = (address) *(sender_sp-1);
484
485 // This is the saved value of EBP which may or may not really be an FP.
486 // It is only an FP if the sender is an interpreter frame (or C1?).
487 intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
488
489 if (map->update_map()) {
490 // Tell GC to use argument oopmaps for some runtime stubs that need it.
491 // For C1, the runtime stub might not have oop maps, so set this flag
492 // outside of update_register_map.
493 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
494 if (_cb->oop_maps() != NULL) {
495 OopMapSet::update_register_map(this, map);
496 }
497
498 // Since the prolog does the save and restore of EBP there is no oopmap
499 // for it so we must fill in its location as if there was an oopmap entry
500 // since if our caller was compiled code there could be live jvm state in it.
501 update_map_with_saved_link(map, saved_fp_addr);
502 }
503
504 assert(sender_sp != sp(), "must have changed");
505 return frame(sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
506 }
507
508
509 //------------------------------------------------------------------------------
510 // frame::sender
511 frame frame::sender(RegisterMap* map) const {
512 // Default is we done have to follow them. The sender_for_xxx will
513 // update it accordingly
514 map->set_include_argument_oops(false);
515
516 if (is_entry_frame()) return Continuation::fix_continuation_bottom_sender(*this, sender_for_entry_frame(map), map);
517 if (is_interpreted_frame()) return Continuation::fix_continuation_bottom_sender(*this, sender_for_interpreter_frame(map), map);
518 assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
519
520 if (_cb != NULL) {
521 return Continuation::fix_continuation_bottom_sender(*this, sender_for_compiled_frame(map), map);
522 }
523 // Must be native-compiled frame, i.e. the marshaling code for native
524 // methods that exists in the core system.
525 return frame(sender_sp(), link(), sender_pc());
526 }
527
528 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
529 assert(is_interpreted_frame(), "Not an interpreted frame");
530 // These are reasonable sanity checks
531 if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
532 return false;
533 }
534 if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
535 return false;
536 }
537 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
538 return false;
539 }
540 // These are hacks to keep us out of trouble.
541 // The problem with these is that they mask other problems
542 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
543 return false;
544 }
545
546 // do some validation of frame elements
547 // first the method
548
549 Method* m = *interpreter_frame_method_addr();
550
551 // validate the method we'd find in this potential sender
552 if (!m->is_valid_method()) return false;
553
554 // stack frames shouldn't be much larger than max_stack elements
555 // this test requires the use the unextended_sp which is the sp as seen by
556 // the current frame, and not sp which is the "raw" pc which could point
557 // further because of local variables of the callee method inserted after
558 // method arguments
559 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
560 return false;
561 }
562
563 // validate bci/bcp
564
565 address bcp = interpreter_frame_bcp();
566 if (m->validate_bci_from_bcp(bcp) < 0) {
567 return false;
568 }
569
570 // validate ConstantPoolCache*
571 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
572 if (cp == NULL || !cp->is_metaspace_object()) return false;
573
574 // validate locals
575
576 address locals = (address) *interpreter_frame_locals_addr();
577
578 if (locals > thread->stack_base() || locals < (address) fp()) return false;
579
580 // We'd have to be pretty unlucky to be mislead at this point
581 return true;
582 }
583
584 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
585 assert(is_interpreted_frame(), "interpreted frame expected");
586 Method* method = interpreter_frame_method();
587 BasicType type = method->result_type();
588
589 intptr_t* tos_addr;
590 if (method->is_native()) {
591 // Prior to calling into the runtime to report the method_exit the possible
592 // return value is pushed to the native stack. If the result is a jfloat/jdouble
593 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
594 tos_addr = (intptr_t*)sp();
595 if (type == T_FLOAT || type == T_DOUBLE) {
596 // QQQ seems like this code is equivalent on the two platforms
597 #ifdef AMD64
598 // This is times two because we do a push(ltos) after pushing XMM0
599 // and that takes two interpreter stack slots.
600 tos_addr += 2 * Interpreter::stackElementWords;
601 #else
602 tos_addr += 2;
603 #endif // AMD64
604 }
605 } else {
606 tos_addr = (intptr_t*)interpreter_frame_tos_address();
607 }
608
609 switch (type) {
610 case T_OBJECT :
611 case T_ARRAY : {
612 oop obj;
613 if (method->is_native()) {
614 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
615 } else {
616 oop* obj_p = (oop*)tos_addr;
617 obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
618 }
619 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
620 *oop_result = obj;
621 break;
622 }
623 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
624 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
625 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
626 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
627 case T_INT : value_result->i = *(jint*)tos_addr; break;
628 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
629 case T_FLOAT : {
630 #ifdef AMD64
631 value_result->f = *(jfloat*)tos_addr;
632 #else
633 if (method->is_native()) {
634 jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat
635 value_result->f = (jfloat)d;
636 } else {
637 value_result->f = *(jfloat*)tos_addr;
638 }
639 #endif // AMD64
640 break;
641 }
642 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
643 case T_VOID : /* Nothing to do */ break;
644 default : ShouldNotReachHere();
645 }
646
647 return type;
648 }
649
650
651 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
652 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
653 return &interpreter_frame_tos_address()[index];
654 }
655
656 #ifndef PRODUCT
657
658 #define DESCRIBE_FP_OFFSET(name) \
659 values.describe(frame_no, fp() + frame::name##_offset, #name)
660
661 void frame::describe_pd(FrameValues& values, int frame_no) {
662 if (is_interpreted_frame()) {
663 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
664 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
665 DESCRIBE_FP_OFFSET(interpreter_frame_method);
666 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
667 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
668 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
669 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
670 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
671 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
672 #ifdef AMD64
673 } else if (is_entry_frame()) {
674 // This could be more descriptive if we use the enum in
675 // stubGenerator to map to real names but it's most important to
676 // claim these frame slots so the error checking works.
677 for (int i = 0; i < entry_frame_after_call_words; i++) {
678 values.describe(frame_no, fp() - i, err_msg("call_stub word fp - %d", i));
679 }
680 #endif // AMD64
681 }
682 }
683 #endif // !PRODUCT
684
685 intptr_t *frame::initial_deoptimization_info() {
686 // used to reset the saved FP
687 return fp();
688 }
689
690 intptr_t* frame::real_fp() const {
691 if (_cb != NULL) {
692 // use the frame size if valid
693 int size = _cb->frame_size();
694 if (size > 0) {
695 return unextended_sp() + size;
696 }
697 }
698 // else rely on fp()
699 assert(! is_compiled_frame(), "unknown compiled frame size");
700 return fp();
701 }
702
703 #ifndef PRODUCT
704 // This is a generic constructor which is only used by pns() in debug.cpp.
705 frame::frame(void* sp, void* fp, void* pc) {
706 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
707 }
708
709 void frame::pd_ps() {}
710 #endif
711
712 void JavaFrameAnchor::make_walkable(JavaThread* thread) {
713 // last frame set?
714 if (last_Java_sp() == NULL) return;
715 // already walkable?
716 if (walkable()) return;
717 vmassert(Thread::current() == (Thread*)thread, "not current thread");
718 vmassert(last_Java_sp() != NULL, "not called from Java code?");
719 vmassert(last_Java_pc() == NULL, "already walkable");
720 capture_last_Java_pc();
721 vmassert(walkable(), "something went wrong");
722 }
723
724 void JavaFrameAnchor::capture_last_Java_pc() {
725 vmassert(_last_Java_sp != NULL, "no last frame set");
726 vmassert(_last_Java_pc == NULL, "already walkable");
727 _last_Java_pc = (address)_last_Java_sp[-1];
728 }