Thu, 13 Jan 2011 22:15:41 -0800
4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed
1 /*
2 * Copyright (c) 1997, 2011, 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 */
25 #include "precompiled.hpp"
26 #include "gc_interface/collectedHeap.inline.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "interpreter/oopMapCache.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "memory/universe.inline.hpp"
31 #include "oops/markOop.hpp"
32 #include "oops/methodDataOop.hpp"
33 #include "oops/methodOop.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "oops/oop.inline2.hpp"
36 #include "runtime/frame.inline.hpp"
37 #include "runtime/handles.inline.hpp"
38 #include "runtime/javaCalls.hpp"
39 #include "runtime/monitorChunk.hpp"
40 #include "runtime/sharedRuntime.hpp"
41 #include "runtime/signature.hpp"
42 #include "runtime/stubCodeGenerator.hpp"
43 #include "runtime/stubRoutines.hpp"
44 #include "utilities/decoder.hpp"
46 #ifdef TARGET_ARCH_x86
47 # include "nativeInst_x86.hpp"
48 #endif
49 #ifdef TARGET_ARCH_sparc
50 # include "nativeInst_sparc.hpp"
51 #endif
52 #ifdef TARGET_ARCH_zero
53 # include "nativeInst_zero.hpp"
54 #endif
56 RegisterMap::RegisterMap(JavaThread *thread, bool update_map) {
57 _thread = thread;
58 _update_map = update_map;
59 clear();
60 debug_only(_update_for_id = NULL;)
61 #ifndef PRODUCT
62 for (int i = 0; i < reg_count ; i++ ) _location[i] = NULL;
63 #endif /* PRODUCT */
64 }
66 RegisterMap::RegisterMap(const RegisterMap* map) {
67 assert(map != this, "bad initialization parameter");
68 assert(map != NULL, "RegisterMap must be present");
69 _thread = map->thread();
70 _update_map = map->update_map();
71 _include_argument_oops = map->include_argument_oops();
72 debug_only(_update_for_id = map->_update_for_id;)
73 pd_initialize_from(map);
74 if (update_map()) {
75 for(int i = 0; i < location_valid_size; i++) {
76 LocationValidType bits = !update_map() ? 0 : map->_location_valid[i];
77 _location_valid[i] = bits;
78 // for whichever bits are set, pull in the corresponding map->_location
79 int j = i*location_valid_type_size;
80 while (bits != 0) {
81 if ((bits & 1) != 0) {
82 assert(0 <= j && j < reg_count, "range check");
83 _location[j] = map->_location[j];
84 }
85 bits >>= 1;
86 j += 1;
87 }
88 }
89 }
90 }
92 void RegisterMap::clear() {
93 set_include_argument_oops(true);
94 if (_update_map) {
95 for(int i = 0; i < location_valid_size; i++) {
96 _location_valid[i] = 0;
97 }
98 pd_clear();
99 } else {
100 pd_initialize();
101 }
102 }
104 #ifndef PRODUCT
106 void RegisterMap::print_on(outputStream* st) const {
107 st->print_cr("Register map");
108 for(int i = 0; i < reg_count; i++) {
110 VMReg r = VMRegImpl::as_VMReg(i);
111 intptr_t* src = (intptr_t*) location(r);
112 if (src != NULL) {
114 r->print_on(st);
115 st->print(" [" INTPTR_FORMAT "] = ", src);
116 if (((uintptr_t)src & (sizeof(*src)-1)) != 0) {
117 st->print_cr("<misaligned>");
118 } else {
119 st->print_cr(INTPTR_FORMAT, *src);
120 }
121 }
122 }
123 }
125 void RegisterMap::print() const {
126 print_on(tty);
127 }
129 #endif
130 // This returns the pc that if you were in the debugger you'd see. Not
131 // the idealized value in the frame object. This undoes the magic conversion
132 // that happens for deoptimized frames. In addition it makes the value the
133 // hardware would want to see in the native frame. The only user (at this point)
134 // is deoptimization. It likely no one else should ever use it.
136 address frame::raw_pc() const {
137 if (is_deoptimized_frame()) {
138 nmethod* nm = cb()->as_nmethod_or_null();
139 if (nm->is_method_handle_return(pc()))
140 return nm->deopt_mh_handler_begin() - pc_return_offset;
141 else
142 return nm->deopt_handler_begin() - pc_return_offset;
143 } else {
144 return (pc() - pc_return_offset);
145 }
146 }
148 // Change the pc in a frame object. This does not change the actual pc in
149 // actual frame. To do that use patch_pc.
150 //
151 void frame::set_pc(address newpc ) {
152 #ifdef ASSERT
153 if (_cb != NULL && _cb->is_nmethod()) {
154 assert(!((nmethod*)_cb)->is_deopt_pc(_pc), "invariant violation");
155 }
156 #endif // ASSERT
158 // Unsafe to use the is_deoptimzed tester after changing pc
159 _deopt_state = unknown;
160 _pc = newpc;
161 _cb = CodeCache::find_blob_unsafe(_pc);
163 }
165 // type testers
166 bool frame::is_deoptimized_frame() const {
167 assert(_deopt_state != unknown, "not answerable");
168 return _deopt_state == is_deoptimized;
169 }
171 bool frame::is_native_frame() const {
172 return (_cb != NULL &&
173 _cb->is_nmethod() &&
174 ((nmethod*)_cb)->is_native_method());
175 }
177 bool frame::is_java_frame() const {
178 if (is_interpreted_frame()) return true;
179 if (is_compiled_frame()) return true;
180 return false;
181 }
184 bool frame::is_compiled_frame() const {
185 if (_cb != NULL &&
186 _cb->is_nmethod() &&
187 ((nmethod*)_cb)->is_java_method()) {
188 return true;
189 }
190 return false;
191 }
194 bool frame::is_runtime_frame() const {
195 return (_cb != NULL && _cb->is_runtime_stub());
196 }
198 bool frame::is_safepoint_blob_frame() const {
199 return (_cb != NULL && _cb->is_safepoint_stub());
200 }
202 // testers
204 bool frame::is_first_java_frame() const {
205 RegisterMap map(JavaThread::current(), false); // No update
206 frame s;
207 for (s = sender(&map); !(s.is_java_frame() || s.is_first_frame()); s = s.sender(&map));
208 return s.is_first_frame();
209 }
212 bool frame::entry_frame_is_first() const {
213 return entry_frame_call_wrapper()->anchor()->last_Java_sp() == NULL;
214 }
217 bool frame::should_be_deoptimized() const {
218 if (_deopt_state == is_deoptimized ||
219 !is_compiled_frame() ) return false;
220 assert(_cb != NULL && _cb->is_nmethod(), "must be an nmethod");
221 nmethod* nm = (nmethod *)_cb;
222 if (TraceDependencies) {
223 tty->print("checking (%s) ", nm->is_marked_for_deoptimization() ? "true" : "false");
224 nm->print_value_on(tty);
225 tty->cr();
226 }
228 if( !nm->is_marked_for_deoptimization() )
229 return false;
231 // If at the return point, then the frame has already been popped, and
232 // only the return needs to be executed. Don't deoptimize here.
233 return !nm->is_at_poll_return(pc());
234 }
236 bool frame::can_be_deoptimized() const {
237 if (!is_compiled_frame()) return false;
238 nmethod* nm = (nmethod*)_cb;
240 if( !nm->can_be_deoptimized() )
241 return false;
243 return !nm->is_at_poll_return(pc());
244 }
246 void frame::deoptimize(JavaThread* thread) {
247 // Schedule deoptimization of an nmethod activation with this frame.
248 assert(_cb != NULL && _cb->is_nmethod(), "must be");
249 nmethod* nm = (nmethod*)_cb;
251 // This is a fix for register window patching race
252 if (NeedsDeoptSuspend && Thread::current() != thread) {
253 assert(SafepointSynchronize::is_at_safepoint(),
254 "patching other threads for deopt may only occur at a safepoint");
256 // It is possible especially with DeoptimizeALot/DeoptimizeRandom that
257 // we could see the frame again and ask for it to be deoptimized since
258 // it might move for a long time. That is harmless and we just ignore it.
259 if (id() == thread->must_deopt_id()) {
260 assert(thread->is_deopt_suspend(), "lost suspension");
261 return;
262 }
264 // We are at a safepoint so the target thread can only be
265 // in 4 states:
266 // blocked - no problem
267 // blocked_trans - no problem (i.e. could have woken up from blocked
268 // during a safepoint).
269 // native - register window pc patching race
270 // native_trans - momentary state
271 //
272 // We could just wait out a thread in native_trans to block.
273 // Then we'd have all the issues that the safepoint code has as to
274 // whether to spin or block. It isn't worth it. Just treat it like
275 // native and be done with it.
276 //
277 // Examine the state of the thread at the start of safepoint since
278 // threads that were in native at the start of the safepoint could
279 // come to a halt during the safepoint, changing the current value
280 // of the safepoint_state.
281 JavaThreadState state = thread->safepoint_state()->orig_thread_state();
282 if (state == _thread_in_native || state == _thread_in_native_trans) {
283 // Since we are at a safepoint the target thread will stop itself
284 // before it can return to java as long as we remain at the safepoint.
285 // Therefore we can put an additional request for the thread to stop
286 // no matter what no (like a suspend). This will cause the thread
287 // to notice it needs to do the deopt on its own once it leaves native.
288 //
289 // The only reason we must do this is because on machine with register
290 // windows we have a race with patching the return address and the
291 // window coming live as the thread returns to the Java code (but still
292 // in native mode) and then blocks. It is only this top most frame
293 // that is at risk. So in truth we could add an additional check to
294 // see if this frame is one that is at risk.
295 RegisterMap map(thread, false);
296 frame at_risk = thread->last_frame().sender(&map);
297 if (id() == at_risk.id()) {
298 thread->set_must_deopt_id(id());
299 thread->set_deopt_suspend();
300 return;
301 }
302 }
303 } // NeedsDeoptSuspend
306 // If the call site is a MethodHandle call site use the MH deopt
307 // handler.
308 address deopt = nm->is_method_handle_return(pc()) ?
309 nm->deopt_mh_handler_begin() :
310 nm->deopt_handler_begin();
312 // Save the original pc before we patch in the new one
313 nm->set_original_pc(this, pc());
314 patch_pc(thread, deopt);
316 #ifdef ASSERT
317 {
318 RegisterMap map(thread, false);
319 frame check = thread->last_frame();
320 while (id() != check.id()) {
321 check = check.sender(&map);
322 }
323 assert(check.is_deoptimized_frame(), "missed deopt");
324 }
325 #endif // ASSERT
326 }
328 frame frame::java_sender() const {
329 RegisterMap map(JavaThread::current(), false);
330 frame s;
331 for (s = sender(&map); !(s.is_java_frame() || s.is_first_frame()); s = s.sender(&map)) ;
332 guarantee(s.is_java_frame(), "tried to get caller of first java frame");
333 return s;
334 }
336 frame frame::real_sender(RegisterMap* map) const {
337 frame result = sender(map);
338 while (result.is_runtime_frame()) {
339 result = result.sender(map);
340 }
341 return result;
342 }
344 // Note: called by profiler - NOT for current thread
345 frame frame::profile_find_Java_sender_frame(JavaThread *thread) {
346 // If we don't recognize this frame, walk back up the stack until we do
347 RegisterMap map(thread, false);
348 frame first_java_frame = frame();
350 // Find the first Java frame on the stack starting with input frame
351 if (is_java_frame()) {
352 // top frame is compiled frame or deoptimized frame
353 first_java_frame = *this;
354 } else if (safe_for_sender(thread)) {
355 for (frame sender_frame = sender(&map);
356 sender_frame.safe_for_sender(thread) && !sender_frame.is_first_frame();
357 sender_frame = sender_frame.sender(&map)) {
358 if (sender_frame.is_java_frame()) {
359 first_java_frame = sender_frame;
360 break;
361 }
362 }
363 }
364 return first_java_frame;
365 }
367 // Interpreter frames
370 void frame::interpreter_frame_set_locals(intptr_t* locs) {
371 assert(is_interpreted_frame(), "Not an interpreted frame");
372 *interpreter_frame_locals_addr() = locs;
373 }
375 methodOop frame::interpreter_frame_method() const {
376 assert(is_interpreted_frame(), "interpreted frame expected");
377 methodOop m = *interpreter_frame_method_addr();
378 assert(m->is_perm(), "bad methodOop in interpreter frame");
379 assert(m->is_method(), "not a methodOop");
380 return m;
381 }
383 void frame::interpreter_frame_set_method(methodOop method) {
384 assert(is_interpreted_frame(), "interpreted frame expected");
385 *interpreter_frame_method_addr() = method;
386 }
388 void frame::interpreter_frame_set_bcx(intptr_t bcx) {
389 assert(is_interpreted_frame(), "Not an interpreted frame");
390 if (ProfileInterpreter) {
391 bool formerly_bci = is_bci(interpreter_frame_bcx());
392 bool is_now_bci = is_bci(bcx);
393 *interpreter_frame_bcx_addr() = bcx;
395 intptr_t mdx = interpreter_frame_mdx();
397 if (mdx != 0) {
398 if (formerly_bci) {
399 if (!is_now_bci) {
400 // The bcx was just converted from bci to bcp.
401 // Convert the mdx in parallel.
402 methodDataOop mdo = interpreter_frame_method()->method_data();
403 assert(mdo != NULL, "");
404 int mdi = mdx - 1; // We distinguish valid mdi from zero by adding one.
405 address mdp = mdo->di_to_dp(mdi);
406 interpreter_frame_set_mdx((intptr_t)mdp);
407 }
408 } else {
409 if (is_now_bci) {
410 // The bcx was just converted from bcp to bci.
411 // Convert the mdx in parallel.
412 methodDataOop mdo = interpreter_frame_method()->method_data();
413 assert(mdo != NULL, "");
414 int mdi = mdo->dp_to_di((address)mdx);
415 interpreter_frame_set_mdx((intptr_t)mdi + 1); // distinguish valid from 0.
416 }
417 }
418 }
419 } else {
420 *interpreter_frame_bcx_addr() = bcx;
421 }
422 }
424 jint frame::interpreter_frame_bci() const {
425 assert(is_interpreted_frame(), "interpreted frame expected");
426 intptr_t bcx = interpreter_frame_bcx();
427 return is_bci(bcx) ? bcx : interpreter_frame_method()->bci_from((address)bcx);
428 }
430 void frame::interpreter_frame_set_bci(jint bci) {
431 assert(is_interpreted_frame(), "interpreted frame expected");
432 assert(!is_bci(interpreter_frame_bcx()), "should not set bci during GC");
433 interpreter_frame_set_bcx((intptr_t)interpreter_frame_method()->bcp_from(bci));
434 }
436 address frame::interpreter_frame_bcp() const {
437 assert(is_interpreted_frame(), "interpreted frame expected");
438 intptr_t bcx = interpreter_frame_bcx();
439 return is_bci(bcx) ? interpreter_frame_method()->bcp_from(bcx) : (address)bcx;
440 }
442 void frame::interpreter_frame_set_bcp(address bcp) {
443 assert(is_interpreted_frame(), "interpreted frame expected");
444 assert(!is_bci(interpreter_frame_bcx()), "should not set bcp during GC");
445 interpreter_frame_set_bcx((intptr_t)bcp);
446 }
448 void frame::interpreter_frame_set_mdx(intptr_t mdx) {
449 assert(is_interpreted_frame(), "Not an interpreted frame");
450 assert(ProfileInterpreter, "must be profiling interpreter");
451 *interpreter_frame_mdx_addr() = mdx;
452 }
454 address frame::interpreter_frame_mdp() const {
455 assert(ProfileInterpreter, "must be profiling interpreter");
456 assert(is_interpreted_frame(), "interpreted frame expected");
457 intptr_t bcx = interpreter_frame_bcx();
458 intptr_t mdx = interpreter_frame_mdx();
460 assert(!is_bci(bcx), "should not access mdp during GC");
461 return (address)mdx;
462 }
464 void frame::interpreter_frame_set_mdp(address mdp) {
465 assert(is_interpreted_frame(), "interpreted frame expected");
466 if (mdp == NULL) {
467 // Always allow the mdp to be cleared.
468 interpreter_frame_set_mdx((intptr_t)mdp);
469 }
470 intptr_t bcx = interpreter_frame_bcx();
471 assert(!is_bci(bcx), "should not set mdp during GC");
472 interpreter_frame_set_mdx((intptr_t)mdp);
473 }
475 BasicObjectLock* frame::next_monitor_in_interpreter_frame(BasicObjectLock* current) const {
476 assert(is_interpreted_frame(), "Not an interpreted frame");
477 #ifdef ASSERT
478 interpreter_frame_verify_monitor(current);
479 #endif
480 BasicObjectLock* next = (BasicObjectLock*) (((intptr_t*) current) + interpreter_frame_monitor_size());
481 return next;
482 }
484 BasicObjectLock* frame::previous_monitor_in_interpreter_frame(BasicObjectLock* current) const {
485 assert(is_interpreted_frame(), "Not an interpreted frame");
486 #ifdef ASSERT
487 // // This verification needs to be checked before being enabled
488 // interpreter_frame_verify_monitor(current);
489 #endif
490 BasicObjectLock* previous = (BasicObjectLock*) (((intptr_t*) current) - interpreter_frame_monitor_size());
491 return previous;
492 }
494 // Interpreter locals and expression stack locations.
496 intptr_t* frame::interpreter_frame_local_at(int index) const {
497 const int n = Interpreter::local_offset_in_bytes(index)/wordSize;
498 return &((*interpreter_frame_locals_addr())[n]);
499 }
501 intptr_t* frame::interpreter_frame_expression_stack_at(jint offset) const {
502 const int i = offset * interpreter_frame_expression_stack_direction();
503 const int n = i * Interpreter::stackElementWords;
504 return &(interpreter_frame_expression_stack()[n]);
505 }
507 jint frame::interpreter_frame_expression_stack_size() const {
508 // Number of elements on the interpreter expression stack
509 // Callers should span by stackElementWords
510 int element_size = Interpreter::stackElementWords;
511 if (frame::interpreter_frame_expression_stack_direction() < 0) {
512 return (interpreter_frame_expression_stack() -
513 interpreter_frame_tos_address() + 1)/element_size;
514 } else {
515 return (interpreter_frame_tos_address() -
516 interpreter_frame_expression_stack() + 1)/element_size;
517 }
518 }
521 // (frame::interpreter_frame_sender_sp accessor is in frame_<arch>.cpp)
523 const char* frame::print_name() const {
524 if (is_native_frame()) return "Native";
525 if (is_interpreted_frame()) return "Interpreted";
526 if (is_compiled_frame()) {
527 if (is_deoptimized_frame()) return "Deoptimized";
528 return "Compiled";
529 }
530 if (sp() == NULL) return "Empty";
531 return "C";
532 }
534 void frame::print_value_on(outputStream* st, JavaThread *thread) const {
535 NOT_PRODUCT(address begin = pc()-40;)
536 NOT_PRODUCT(address end = NULL;)
538 st->print("%s frame (sp=" INTPTR_FORMAT " unextended sp=" INTPTR_FORMAT, print_name(), sp(), unextended_sp());
539 if (sp() != NULL)
540 st->print(", fp=" INTPTR_FORMAT ", pc=" INTPTR_FORMAT, fp(), pc());
542 if (StubRoutines::contains(pc())) {
543 st->print_cr(")");
544 st->print("(");
545 StubCodeDesc* desc = StubCodeDesc::desc_for(pc());
546 st->print("~Stub::%s", desc->name());
547 NOT_PRODUCT(begin = desc->begin(); end = desc->end();)
548 } else if (Interpreter::contains(pc())) {
549 st->print_cr(")");
550 st->print("(");
551 InterpreterCodelet* desc = Interpreter::codelet_containing(pc());
552 if (desc != NULL) {
553 st->print("~");
554 desc->print();
555 NOT_PRODUCT(begin = desc->code_begin(); end = desc->code_end();)
556 } else {
557 st->print("~interpreter");
558 }
559 }
560 st->print_cr(")");
562 if (_cb != NULL) {
563 st->print(" ");
564 _cb->print_value_on(st);
565 st->cr();
566 #ifndef PRODUCT
567 if (end == NULL) {
568 begin = _cb->code_begin();
569 end = _cb->code_end();
570 }
571 #endif
572 }
573 NOT_PRODUCT(if (WizardMode && Verbose) Disassembler::decode(begin, end);)
574 }
577 void frame::print_on(outputStream* st) const {
578 print_value_on(st,NULL);
579 if (is_interpreted_frame()) {
580 interpreter_frame_print_on(st);
581 }
582 }
585 void frame::interpreter_frame_print_on(outputStream* st) const {
586 #ifndef PRODUCT
587 assert(is_interpreted_frame(), "Not an interpreted frame");
588 jint i;
589 for (i = 0; i < interpreter_frame_method()->max_locals(); i++ ) {
590 intptr_t x = *interpreter_frame_local_at(i);
591 st->print(" - local [" INTPTR_FORMAT "]", x);
592 st->fill_to(23);
593 st->print_cr("; #%d", i);
594 }
595 for (i = interpreter_frame_expression_stack_size() - 1; i >= 0; --i ) {
596 intptr_t x = *interpreter_frame_expression_stack_at(i);
597 st->print(" - stack [" INTPTR_FORMAT "]", x);
598 st->fill_to(23);
599 st->print_cr("; #%d", i);
600 }
601 // locks for synchronization
602 for (BasicObjectLock* current = interpreter_frame_monitor_end();
603 current < interpreter_frame_monitor_begin();
604 current = next_monitor_in_interpreter_frame(current)) {
605 st->print(" - obj [");
606 current->obj()->print_value_on(st);
607 st->print_cr("]");
608 st->print(" - lock [");
609 current->lock()->print_on(st);
610 st->print_cr("]");
611 }
612 // monitor
613 st->print_cr(" - monitor[" INTPTR_FORMAT "]", interpreter_frame_monitor_begin());
614 // bcp
615 st->print(" - bcp [" INTPTR_FORMAT "]", interpreter_frame_bcp());
616 st->fill_to(23);
617 st->print_cr("; @%d", interpreter_frame_bci());
618 // locals
619 st->print_cr(" - locals [" INTPTR_FORMAT "]", interpreter_frame_local_at(0));
620 // method
621 st->print(" - method [" INTPTR_FORMAT "]", (address)interpreter_frame_method());
622 st->fill_to(23);
623 st->print("; ");
624 interpreter_frame_method()->print_name(st);
625 st->cr();
626 #endif
627 }
629 // Return whether the frame is in the VM or os indicating a Hotspot problem.
630 // Otherwise, it's likely a bug in the native library that the Java code calls,
631 // hopefully indicating where to submit bugs.
632 static void print_C_frame(outputStream* st, char* buf, int buflen, address pc) {
633 // C/C++ frame
634 bool in_vm = os::address_is_in_vm(pc);
635 st->print(in_vm ? "V" : "C");
637 int offset;
638 bool found;
640 // libname
641 found = os::dll_address_to_library_name(pc, buf, buflen, &offset);
642 if (found) {
643 // skip directory names
644 const char *p1, *p2;
645 p1 = buf;
646 int len = (int)strlen(os::file_separator());
647 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
648 st->print(" [%s+0x%x]", p1, offset);
649 } else {
650 st->print(" " PTR_FORMAT, pc);
651 }
653 // function name - os::dll_address_to_function_name() may return confusing
654 // names if pc is within jvm.dll or libjvm.so, because JVM only has
655 // JVM_xxxx and a few other symbols in the dynamic symbol table. Do this
656 // only for native libraries.
657 if (!in_vm || Decoder::can_decode_C_frame_in_vm()) {
658 found = os::dll_address_to_function_name(pc, buf, buflen, &offset);
660 if (found) {
661 st->print(" %s+0x%x", buf, offset);
662 }
663 }
664 }
666 // frame::print_on_error() is called by fatal error handler. Notice that we may
667 // crash inside this function if stack frame is corrupted. The fatal error
668 // handler can catch and handle the crash. Here we assume the frame is valid.
669 //
670 // First letter indicates type of the frame:
671 // J: Java frame (compiled)
672 // j: Java frame (interpreted)
673 // V: VM frame (C/C++)
674 // v: Other frames running VM generated code (e.g. stubs, adapters, etc.)
675 // C: C/C++ frame
676 //
677 // We don't need detailed frame type as that in frame::print_name(). "C"
678 // suggests the problem is in user lib; everything else is likely a VM bug.
680 void frame::print_on_error(outputStream* st, char* buf, int buflen, bool verbose) const {
681 if (_cb != NULL) {
682 if (Interpreter::contains(pc())) {
683 methodOop m = this->interpreter_frame_method();
684 if (m != NULL) {
685 m->name_and_sig_as_C_string(buf, buflen);
686 st->print("j %s", buf);
687 st->print("+%d", this->interpreter_frame_bci());
688 } else {
689 st->print("j " PTR_FORMAT, pc());
690 }
691 } else if (StubRoutines::contains(pc())) {
692 StubCodeDesc* desc = StubCodeDesc::desc_for(pc());
693 if (desc != NULL) {
694 st->print("v ~StubRoutines::%s", desc->name());
695 } else {
696 st->print("v ~StubRoutines::" PTR_FORMAT, pc());
697 }
698 } else if (_cb->is_buffer_blob()) {
699 st->print("v ~BufferBlob::%s", ((BufferBlob *)_cb)->name());
700 } else if (_cb->is_nmethod()) {
701 methodOop m = ((nmethod *)_cb)->method();
702 if (m != NULL) {
703 m->name_and_sig_as_C_string(buf, buflen);
704 st->print("J %s", buf);
705 } else {
706 st->print("J " PTR_FORMAT, pc());
707 }
708 } else if (_cb->is_runtime_stub()) {
709 st->print("v ~RuntimeStub::%s", ((RuntimeStub *)_cb)->name());
710 } else if (_cb->is_deoptimization_stub()) {
711 st->print("v ~DeoptimizationBlob");
712 } else if (_cb->is_exception_stub()) {
713 st->print("v ~ExceptionBlob");
714 } else if (_cb->is_safepoint_stub()) {
715 st->print("v ~SafepointBlob");
716 } else {
717 st->print("v blob " PTR_FORMAT, pc());
718 }
719 } else {
720 print_C_frame(st, buf, buflen, pc());
721 }
722 }
725 /*
726 The interpreter_frame_expression_stack_at method in the case of SPARC needs the
727 max_stack value of the method in order to compute the expression stack address.
728 It uses the methodOop in order to get the max_stack value but during GC this
729 methodOop value saved on the frame is changed by reverse_and_push and hence cannot
730 be used. So we save the max_stack value in the FrameClosure object and pass it
731 down to the interpreter_frame_expression_stack_at method
732 */
733 class InterpreterFrameClosure : public OffsetClosure {
734 private:
735 frame* _fr;
736 OopClosure* _f;
737 int _max_locals;
738 int _max_stack;
740 public:
741 InterpreterFrameClosure(frame* fr, int max_locals, int max_stack,
742 OopClosure* f) {
743 _fr = fr;
744 _max_locals = max_locals;
745 _max_stack = max_stack;
746 _f = f;
747 }
749 void offset_do(int offset) {
750 oop* addr;
751 if (offset < _max_locals) {
752 addr = (oop*) _fr->interpreter_frame_local_at(offset);
753 assert((intptr_t*)addr >= _fr->sp(), "must be inside the frame");
754 _f->do_oop(addr);
755 } else {
756 addr = (oop*) _fr->interpreter_frame_expression_stack_at((offset - _max_locals));
757 // In case of exceptions, the expression stack is invalid and the esp will be reset to express
758 // this condition. Therefore, we call f only if addr is 'inside' the stack (i.e., addr >= esp for Intel).
759 bool in_stack;
760 if (frame::interpreter_frame_expression_stack_direction() > 0) {
761 in_stack = (intptr_t*)addr <= _fr->interpreter_frame_tos_address();
762 } else {
763 in_stack = (intptr_t*)addr >= _fr->interpreter_frame_tos_address();
764 }
765 if (in_stack) {
766 _f->do_oop(addr);
767 }
768 }
769 }
771 int max_locals() { return _max_locals; }
772 frame* fr() { return _fr; }
773 };
776 class InterpretedArgumentOopFinder: public SignatureInfo {
777 private:
778 OopClosure* _f; // Closure to invoke
779 int _offset; // TOS-relative offset, decremented with each argument
780 bool _has_receiver; // true if the callee has a receiver
781 frame* _fr;
783 void set(int size, BasicType type) {
784 _offset -= size;
785 if (type == T_OBJECT || type == T_ARRAY) oop_offset_do();
786 }
788 void oop_offset_do() {
789 oop* addr;
790 addr = (oop*)_fr->interpreter_frame_tos_at(_offset);
791 _f->do_oop(addr);
792 }
794 public:
795 InterpretedArgumentOopFinder(symbolHandle signature, bool has_receiver, frame* fr, OopClosure* f) : SignatureInfo(signature), _has_receiver(has_receiver) {
796 // compute size of arguments
797 int args_size = ArgumentSizeComputer(signature).size() + (has_receiver ? 1 : 0);
798 assert(!fr->is_interpreted_frame() ||
799 args_size <= fr->interpreter_frame_expression_stack_size(),
800 "args cannot be on stack anymore");
801 // initialize InterpretedArgumentOopFinder
802 _f = f;
803 _fr = fr;
804 _offset = args_size;
805 }
807 void oops_do() {
808 if (_has_receiver) {
809 --_offset;
810 oop_offset_do();
811 }
812 iterate_parameters();
813 }
814 };
817 // Entry frame has following form (n arguments)
818 // +-----------+
819 // sp -> | last arg |
820 // +-----------+
821 // : ::: :
822 // +-----------+
823 // (sp+n)->| first arg|
824 // +-----------+
828 // visits and GC's all the arguments in entry frame
829 class EntryFrameOopFinder: public SignatureInfo {
830 private:
831 bool _is_static;
832 int _offset;
833 frame* _fr;
834 OopClosure* _f;
836 void set(int size, BasicType type) {
837 assert (_offset >= 0, "illegal offset");
838 if (type == T_OBJECT || type == T_ARRAY) oop_at_offset_do(_offset);
839 _offset -= size;
840 }
842 void oop_at_offset_do(int offset) {
843 assert (offset >= 0, "illegal offset");
844 oop* addr = (oop*) _fr->entry_frame_argument_at(offset);
845 _f->do_oop(addr);
846 }
848 public:
849 EntryFrameOopFinder(frame* frame, symbolHandle signature, bool is_static) : SignatureInfo(signature) {
850 _f = NULL; // will be set later
851 _fr = frame;
852 _is_static = is_static;
853 _offset = ArgumentSizeComputer(signature).size() - 1; // last parameter is at index 0
854 }
856 void arguments_do(OopClosure* f) {
857 _f = f;
858 if (!_is_static) oop_at_offset_do(_offset+1); // do the receiver
859 iterate_parameters();
860 }
862 };
864 oop* frame::interpreter_callee_receiver_addr(symbolHandle signature) {
865 ArgumentSizeComputer asc(signature);
866 int size = asc.size();
867 return (oop *)interpreter_frame_tos_at(size);
868 }
871 void frame::oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache) {
872 assert(is_interpreted_frame(), "Not an interpreted frame");
873 assert(map != NULL, "map must be set");
874 Thread *thread = Thread::current();
875 methodHandle m (thread, interpreter_frame_method());
876 jint bci = interpreter_frame_bci();
878 assert(Universe::heap()->is_in(m()), "must be valid oop");
879 assert(m->is_method(), "checking frame value");
880 assert((m->is_native() && bci == 0) || (!m->is_native() && bci >= 0 && bci < m->code_size()), "invalid bci value");
882 // Handle the monitor elements in the activation
883 for (
884 BasicObjectLock* current = interpreter_frame_monitor_end();
885 current < interpreter_frame_monitor_begin();
886 current = next_monitor_in_interpreter_frame(current)
887 ) {
888 #ifdef ASSERT
889 interpreter_frame_verify_monitor(current);
890 #endif
891 current->oops_do(f);
892 }
894 // process fixed part
895 f->do_oop((oop*)interpreter_frame_method_addr());
896 f->do_oop((oop*)interpreter_frame_cache_addr());
898 // Hmm what about the mdp?
899 #ifdef CC_INTERP
900 // Interpreter frame in the midst of a call have a methodOop within the
901 // object.
902 interpreterState istate = get_interpreterState();
903 if (istate->msg() == BytecodeInterpreter::call_method) {
904 f->do_oop((oop*)&istate->_result._to_call._callee);
905 }
907 #endif /* CC_INTERP */
909 #if !defined(PPC) || defined(ZERO)
910 if (m->is_native()) {
911 #ifdef CC_INTERP
912 f->do_oop((oop*)&istate->_oop_temp);
913 #else
914 f->do_oop((oop*)( fp() + interpreter_frame_oop_temp_offset ));
915 #endif /* CC_INTERP */
916 }
917 #else // PPC
918 if (m->is_native() && m->is_static()) {
919 f->do_oop(interpreter_frame_mirror_addr());
920 }
921 #endif // PPC
923 int max_locals = m->is_native() ? m->size_of_parameters() : m->max_locals();
925 symbolHandle signature;
926 bool has_receiver = false;
928 // Process a callee's arguments if we are at a call site
929 // (i.e., if we are at an invoke bytecode)
930 // This is used sometimes for calling into the VM, not for another
931 // interpreted or compiled frame.
932 if (!m->is_native()) {
933 Bytecode_invoke call = Bytecode_invoke_check(m, bci);
934 if (call.is_valid()) {
935 signature = symbolHandle(thread, call.signature());
936 has_receiver = call.has_receiver();
937 if (map->include_argument_oops() &&
938 interpreter_frame_expression_stack_size() > 0) {
939 ResourceMark rm(thread); // is this right ???
940 // we are at a call site & the expression stack is not empty
941 // => process callee's arguments
942 //
943 // Note: The expression stack can be empty if an exception
944 // occurred during method resolution/execution. In all
945 // cases we empty the expression stack completely be-
946 // fore handling the exception (the exception handling
947 // code in the interpreter calls a blocking runtime
948 // routine which can cause this code to be executed).
949 // (was bug gri 7/27/98)
950 oops_interpreted_arguments_do(signature, has_receiver, f);
951 }
952 }
953 }
955 InterpreterFrameClosure blk(this, max_locals, m->max_stack(), f);
957 // process locals & expression stack
958 InterpreterOopMap mask;
959 if (query_oop_map_cache) {
960 m->mask_for(bci, &mask);
961 } else {
962 OopMapCache::compute_one_oop_map(m, bci, &mask);
963 }
964 mask.iterate_oop(&blk);
965 }
968 void frame::oops_interpreted_arguments_do(symbolHandle signature, bool has_receiver, OopClosure* f) {
969 InterpretedArgumentOopFinder finder(signature, has_receiver, this, f);
970 finder.oops_do();
971 }
973 void frame::oops_code_blob_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* reg_map) {
974 assert(_cb != NULL, "sanity check");
975 if (_cb->oop_maps() != NULL) {
976 OopMapSet::oops_do(this, reg_map, f);
978 // Preserve potential arguments for a callee. We handle this by dispatching
979 // on the codeblob. For c2i, we do
980 if (reg_map->include_argument_oops()) {
981 _cb->preserve_callee_argument_oops(*this, reg_map, f);
982 }
983 }
984 // In cases where perm gen is collected, GC will want to mark
985 // oops referenced from nmethods active on thread stacks so as to
986 // prevent them from being collected. However, this visit should be
987 // restricted to certain phases of the collection only. The
988 // closure decides how it wants nmethods to be traced.
989 if (cf != NULL)
990 cf->do_code_blob(_cb);
991 }
993 class CompiledArgumentOopFinder: public SignatureInfo {
994 protected:
995 OopClosure* _f;
996 int _offset; // the current offset, incremented with each argument
997 bool _has_receiver; // true if the callee has a receiver
998 frame _fr;
999 RegisterMap* _reg_map;
1000 int _arg_size;
1001 VMRegPair* _regs; // VMReg list of arguments
1003 void set(int size, BasicType type) {
1004 if (type == T_OBJECT || type == T_ARRAY) handle_oop_offset();
1005 _offset += size;
1006 }
1008 virtual void handle_oop_offset() {
1009 // Extract low order register number from register array.
1010 // In LP64-land, the high-order bits are valid but unhelpful.
1011 VMReg reg = _regs[_offset].first();
1012 oop *loc = _fr.oopmapreg_to_location(reg, _reg_map);
1013 _f->do_oop(loc);
1014 }
1016 public:
1017 CompiledArgumentOopFinder(symbolHandle signature, bool has_receiver, OopClosure* f, frame fr, const RegisterMap* reg_map)
1018 : SignatureInfo(signature) {
1020 // initialize CompiledArgumentOopFinder
1021 _f = f;
1022 _offset = 0;
1023 _has_receiver = has_receiver;
1024 _fr = fr;
1025 _reg_map = (RegisterMap*)reg_map;
1026 _arg_size = ArgumentSizeComputer(signature).size() + (has_receiver ? 1 : 0);
1028 int arg_size;
1029 _regs = SharedRuntime::find_callee_arguments(signature(), has_receiver, &arg_size);
1030 assert(arg_size == _arg_size, "wrong arg size");
1031 }
1033 void oops_do() {
1034 if (_has_receiver) {
1035 handle_oop_offset();
1036 _offset++;
1037 }
1038 iterate_parameters();
1039 }
1040 };
1042 void frame::oops_compiled_arguments_do(symbolHandle signature, bool has_receiver, const RegisterMap* reg_map, OopClosure* f) {
1043 ResourceMark rm;
1044 CompiledArgumentOopFinder finder(signature, has_receiver, f, *this, reg_map);
1045 finder.oops_do();
1046 }
1049 // Get receiver out of callers frame, i.e. find parameter 0 in callers
1050 // frame. Consult ADLC for where parameter 0 is to be found. Then
1051 // check local reg_map for it being a callee-save register or argument
1052 // register, both of which are saved in the local frame. If not found
1053 // there, it must be an in-stack argument of the caller.
1054 // Note: caller.sp() points to callee-arguments
1055 oop frame::retrieve_receiver(RegisterMap* reg_map) {
1056 frame caller = *this;
1058 // First consult the ADLC on where it puts parameter 0 for this signature.
1059 VMReg reg = SharedRuntime::name_for_receiver();
1060 oop r = *caller.oopmapreg_to_location(reg, reg_map);
1061 assert( Universe::heap()->is_in_or_null(r), "bad receiver" );
1062 return r;
1063 }
1066 oop* frame::oopmapreg_to_location(VMReg reg, const RegisterMap* reg_map) const {
1067 if(reg->is_reg()) {
1068 // If it is passed in a register, it got spilled in the stub frame.
1069 return (oop *)reg_map->location(reg);
1070 } else {
1071 int sp_offset_in_bytes = reg->reg2stack() * VMRegImpl::stack_slot_size;
1072 return (oop*)(((address)unextended_sp()) + sp_offset_in_bytes);
1073 }
1074 }
1076 BasicLock* frame::get_native_monitor() {
1077 nmethod* nm = (nmethod*)_cb;
1078 assert(_cb != NULL && _cb->is_nmethod() && nm->method()->is_native(),
1079 "Should not call this unless it's a native nmethod");
1080 int byte_offset = in_bytes(nm->native_basic_lock_sp_offset());
1081 assert(byte_offset >= 0, "should not see invalid offset");
1082 return (BasicLock*) &sp()[byte_offset / wordSize];
1083 }
1085 oop frame::get_native_receiver() {
1086 nmethod* nm = (nmethod*)_cb;
1087 assert(_cb != NULL && _cb->is_nmethod() && nm->method()->is_native(),
1088 "Should not call this unless it's a native nmethod");
1089 int byte_offset = in_bytes(nm->native_receiver_sp_offset());
1090 assert(byte_offset >= 0, "should not see invalid offset");
1091 oop owner = ((oop*) sp())[byte_offset / wordSize];
1092 assert( Universe::heap()->is_in(owner), "bad receiver" );
1093 return owner;
1094 }
1096 void frame::oops_entry_do(OopClosure* f, const RegisterMap* map) {
1097 assert(map != NULL, "map must be set");
1098 if (map->include_argument_oops()) {
1099 // must collect argument oops, as nobody else is doing it
1100 Thread *thread = Thread::current();
1101 methodHandle m (thread, entry_frame_call_wrapper()->callee_method());
1102 symbolHandle signature (thread, m->signature());
1103 EntryFrameOopFinder finder(this, signature, m->is_static());
1104 finder.arguments_do(f);
1105 }
1106 // Traverse the Handle Block saved in the entry frame
1107 entry_frame_call_wrapper()->oops_do(f);
1108 }
1111 void frame::oops_do_internal(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map, bool use_interpreter_oop_map_cache) {
1112 #ifndef PRODUCT
1113 // simulate GC crash here to dump java thread in error report
1114 if (CrashGCForDumpingJavaThread) {
1115 char *t = NULL;
1116 *t = 'c';
1117 }
1118 #endif
1119 if (is_interpreted_frame()) {
1120 oops_interpreted_do(f, map, use_interpreter_oop_map_cache);
1121 } else if (is_entry_frame()) {
1122 oops_entry_do(f, map);
1123 } else if (CodeCache::contains(pc())) {
1124 oops_code_blob_do(f, cf, map);
1125 #ifdef SHARK
1126 } else if (is_fake_stub_frame()) {
1127 // nothing to do
1128 #endif // SHARK
1129 } else {
1130 ShouldNotReachHere();
1131 }
1132 }
1134 void frame::nmethods_do(CodeBlobClosure* cf) {
1135 if (_cb != NULL && _cb->is_nmethod()) {
1136 cf->do_code_blob(_cb);
1137 }
1138 }
1141 void frame::gc_prologue() {
1142 if (is_interpreted_frame()) {
1143 // set bcx to bci to become methodOop position independent during GC
1144 interpreter_frame_set_bcx(interpreter_frame_bci());
1145 }
1146 }
1149 void frame::gc_epilogue() {
1150 if (is_interpreted_frame()) {
1151 // set bcx back to bcp for interpreter
1152 interpreter_frame_set_bcx((intptr_t)interpreter_frame_bcp());
1153 }
1154 // call processor specific epilog function
1155 pd_gc_epilog();
1156 }
1159 # ifdef ENABLE_ZAP_DEAD_LOCALS
1161 void frame::CheckValueClosure::do_oop(oop* p) {
1162 if (CheckOopishValues && Universe::heap()->is_in_reserved(*p)) {
1163 warning("value @ " INTPTR_FORMAT " looks oopish (" INTPTR_FORMAT ") (thread = " INTPTR_FORMAT ")", p, (address)*p, Thread::current());
1164 }
1165 }
1166 frame::CheckValueClosure frame::_check_value;
1169 void frame::CheckOopClosure::do_oop(oop* p) {
1170 if (*p != NULL && !(*p)->is_oop()) {
1171 warning("value @ " INTPTR_FORMAT " should be an oop (" INTPTR_FORMAT ") (thread = " INTPTR_FORMAT ")", p, (address)*p, Thread::current());
1172 }
1173 }
1174 frame::CheckOopClosure frame::_check_oop;
1176 void frame::check_derived_oop(oop* base, oop* derived) {
1177 _check_oop.do_oop(base);
1178 }
1181 void frame::ZapDeadClosure::do_oop(oop* p) {
1182 if (TraceZapDeadLocals) tty->print_cr("zapping @ " INTPTR_FORMAT " containing " INTPTR_FORMAT, p, (address)*p);
1183 // Need cast because on _LP64 the conversion to oop is ambiguous. Constant
1184 // can be either long or int.
1185 *p = (oop)(int)0xbabebabe;
1186 }
1187 frame::ZapDeadClosure frame::_zap_dead;
1189 void frame::zap_dead_locals(JavaThread* thread, const RegisterMap* map) {
1190 assert(thread == Thread::current(), "need to synchronize to do this to another thread");
1191 // Tracing - part 1
1192 if (TraceZapDeadLocals) {
1193 ResourceMark rm(thread);
1194 tty->print_cr("--------------------------------------------------------------------------------");
1195 tty->print("Zapping dead locals in ");
1196 print_on(tty);
1197 tty->cr();
1198 }
1199 // Zapping
1200 if (is_entry_frame ()) zap_dead_entry_locals (thread, map);
1201 else if (is_interpreted_frame()) zap_dead_interpreted_locals(thread, map);
1202 else if (is_compiled_frame()) zap_dead_compiled_locals (thread, map);
1204 else
1205 // could be is_runtime_frame
1206 // so remove error: ShouldNotReachHere();
1207 ;
1208 // Tracing - part 2
1209 if (TraceZapDeadLocals) {
1210 tty->cr();
1211 }
1212 }
1215 void frame::zap_dead_interpreted_locals(JavaThread *thread, const RegisterMap* map) {
1216 // get current interpreter 'pc'
1217 assert(is_interpreted_frame(), "Not an interpreted frame");
1218 methodOop m = interpreter_frame_method();
1219 int bci = interpreter_frame_bci();
1221 int max_locals = m->is_native() ? m->size_of_parameters() : m->max_locals();
1223 // process dynamic part
1224 InterpreterFrameClosure value_blk(this, max_locals, m->max_stack(),
1225 &_check_value);
1226 InterpreterFrameClosure oop_blk(this, max_locals, m->max_stack(),
1227 &_check_oop );
1228 InterpreterFrameClosure dead_blk(this, max_locals, m->max_stack(),
1229 &_zap_dead );
1231 // get frame map
1232 InterpreterOopMap mask;
1233 m->mask_for(bci, &mask);
1234 mask.iterate_all( &oop_blk, &value_blk, &dead_blk);
1235 }
1238 void frame::zap_dead_compiled_locals(JavaThread* thread, const RegisterMap* reg_map) {
1240 ResourceMark rm(thread);
1241 assert(_cb != NULL, "sanity check");
1242 if (_cb->oop_maps() != NULL) {
1243 OopMapSet::all_do(this, reg_map, &_check_oop, check_derived_oop, &_check_value);
1244 }
1245 }
1248 void frame::zap_dead_entry_locals(JavaThread*, const RegisterMap*) {
1249 if (TraceZapDeadLocals) warning("frame::zap_dead_entry_locals unimplemented");
1250 }
1253 void frame::zap_dead_deoptimized_locals(JavaThread*, const RegisterMap*) {
1254 if (TraceZapDeadLocals) warning("frame::zap_dead_deoptimized_locals unimplemented");
1255 }
1257 # endif // ENABLE_ZAP_DEAD_LOCALS
1259 void frame::verify(const RegisterMap* map) {
1260 // for now make sure receiver type is correct
1261 if (is_interpreted_frame()) {
1262 methodOop method = interpreter_frame_method();
1263 guarantee(method->is_method(), "method is wrong in frame::verify");
1264 if (!method->is_static()) {
1265 // fetch the receiver
1266 oop* p = (oop*) interpreter_frame_local_at(0);
1267 // make sure we have the right receiver type
1268 }
1269 }
1270 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), "must be empty before verify");)
1271 oops_do_internal(&VerifyOopClosure::verify_oop, NULL, (RegisterMap*)map, false);
1272 }
1275 #ifdef ASSERT
1276 bool frame::verify_return_pc(address x) {
1277 if (StubRoutines::returns_to_call_stub(x)) {
1278 return true;
1279 }
1280 if (CodeCache::contains(x)) {
1281 return true;
1282 }
1283 if (Interpreter::contains(x)) {
1284 return true;
1285 }
1286 return false;
1287 }
1288 #endif
1291 #ifdef ASSERT
1292 void frame::interpreter_frame_verify_monitor(BasicObjectLock* value) const {
1293 assert(is_interpreted_frame(), "Not an interpreted frame");
1294 // verify that the value is in the right part of the frame
1295 address low_mark = (address) interpreter_frame_monitor_end();
1296 address high_mark = (address) interpreter_frame_monitor_begin();
1297 address current = (address) value;
1299 const int monitor_size = frame::interpreter_frame_monitor_size();
1300 guarantee((high_mark - current) % monitor_size == 0 , "Misaligned top of BasicObjectLock*");
1301 guarantee( high_mark > current , "Current BasicObjectLock* higher than high_mark");
1303 guarantee((current - low_mark) % monitor_size == 0 , "Misaligned bottom of BasicObjectLock*");
1304 guarantee( current >= low_mark , "Current BasicObjectLock* below than low_mark");
1305 }
1306 #endif
1309 //-----------------------------------------------------------------------------------
1310 // StackFrameStream implementation
1312 StackFrameStream::StackFrameStream(JavaThread *thread, bool update) : _reg_map(thread, update) {
1313 assert(thread->has_last_Java_frame(), "sanity check");
1314 _fr = thread->last_frame();
1315 _is_done = false;
1316 }