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 "jvm.h"
27 #include "classfile/systemDictionary.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "gc/shared/collectedHeap.hpp"
35 #include "interpreter/bytecodeHistogram.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "memory/universe.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/privilegedStack.hpp"
41 #include "runtime/arguments.hpp"
42 #include "runtime/atomic.hpp"
43 #include "runtime/frame.hpp"
44 #include "runtime/java.hpp"
45 #include "runtime/os.hpp"
46 #include "runtime/sharedRuntime.hpp"
47 #include "runtime/stubCodeGenerator.hpp"
48 #include "runtime/stubRoutines.hpp"
49 #include "runtime/thread.inline.hpp"
50 #include "runtime/vframe.hpp"
51 #include "runtime/vm_version.hpp"
52 #include "services/heapDumper.hpp"
53 #include "utilities/defaultStream.hpp"
54 #include "utilities/events.hpp"
55 #include "utilities/formatBuffer.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/vmError.hpp"
58
59 #include <stdio.h>
60
61 #ifndef ASSERT
62 # ifdef _DEBUG
63 // NOTE: don't turn the lines below into a comment -- if you're getting
64 // a compile error here, change the settings to define ASSERT
65 ASSERT should be defined when _DEBUG is defined. It is not intended to be used for debugging
66 functions that do not slow down the system too much and thus can be left in optimized code.
67 On the other hand, the code should not be included in a production version.
68 # endif // _DEBUG
69 #endif // ASSERT
70
71
72 #ifdef _DEBUG
73 # ifndef ASSERT
74 configuration error: ASSERT must be defined in debug version
75 # endif // ASSERT
76 #endif // _DEBUG
77
78
79 #ifdef PRODUCT
80 # if -defined _DEBUG || -defined ASSERT
81 configuration error: ASSERT et al. must not be defined in PRODUCT version
82 # endif
83 #endif // PRODUCT
84
85 ATTRIBUTE_PRINTF(1, 2)
86 void warning(const char* format, ...) {
87 if (PrintWarnings) {
88 FILE* const err = defaultStream::error_stream();
89 jio_fprintf(err, "%s warning: ", VM_Version::vm_name());
90 va_list ap;
91 va_start(ap, format);
92 vfprintf(err, format, ap);
93 va_end(ap);
94 fputc('\n', err);
95 }
96 if (BreakAtWarning) BREAKPOINT;
97 }
98
99 #ifndef PRODUCT
100
101 #define is_token_break(ch) (isspace(ch) || (ch) == ',')
102
103 static const char* last_file_name = NULL;
104 static int last_line_no = -1;
105
106 // assert/guarantee/... may happen very early during VM initialization.
107 // Don't rely on anything that is initialized by Threads::create_vm(). For
108 // example, don't use tty.
109 bool error_is_suppressed(const char* file_name, int line_no) {
110 // The following 1-element cache requires that passed-in
111 // file names are always only constant literals.
112 if (file_name == last_file_name && line_no == last_line_no) return true;
113
114 int file_name_len = (int)strlen(file_name);
115 char separator = os::file_separator()[0];
116 const char* base_name = strrchr(file_name, separator);
117 if (base_name == NULL)
118 base_name = file_name;
119
120 // scan the SuppressErrorAt option
121 const char* cp = SuppressErrorAt;
122 for (;;) {
123 const char* sfile;
124 int sfile_len;
125 int sline;
126 bool noisy;
127 while ((*cp) != '\0' && is_token_break(*cp)) cp++;
128 if ((*cp) == '\0') break;
129 sfile = cp;
130 while ((*cp) != '\0' && !is_token_break(*cp) && (*cp) != ':') cp++;
131 sfile_len = cp - sfile;
132 if ((*cp) == ':') cp++;
133 sline = 0;
134 while ((*cp) != '\0' && isdigit(*cp)) {
135 sline *= 10;
136 sline += (*cp) - '0';
137 cp++;
138 }
139 // "file:line!" means the assert suppression is not silent
140 noisy = ((*cp) == '!');
141 while ((*cp) != '\0' && !is_token_break(*cp)) cp++;
142 // match the line
143 if (sline != 0) {
144 if (sline != line_no) continue;
145 }
146 // match the file
147 if (sfile_len > 0) {
148 const char* look = file_name;
149 const char* look_max = file_name + file_name_len - sfile_len;
150 const char* foundp;
151 bool match = false;
152 while (!match
153 && (foundp = strchr(look, sfile[0])) != NULL
154 && foundp <= look_max) {
155 match = true;
156 for (int i = 1; i < sfile_len; i++) {
157 if (sfile[i] != foundp[i]) {
158 match = false;
159 break;
160 }
161 }
162 look = foundp + 1;
163 }
164 if (!match) continue;
165 }
166 // got a match!
167 if (noisy) {
168 fdStream out(defaultStream::output_fd());
169 out.print_raw("[error suppressed at ");
170 out.print_raw(base_name);
171 char buf[16];
172 jio_snprintf(buf, sizeof(buf), ":%d]", line_no);
173 out.print_raw_cr(buf);
174 } else {
175 // update 1-element cache for fast silent matches
176 last_file_name = file_name;
177 last_line_no = line_no;
178 }
179 return true;
180 }
181
182 if (!VMError::is_error_reported() && !SuppressFatalErrorMessage) {
183 // print a friendly hint:
184 fdStream out(defaultStream::output_fd());
185 out.print_raw_cr("# To suppress the following error report, specify this argument");
186 out.print_raw ("# after -XX: or in .hotspotrc: SuppressErrorAt=");
187 out.print_raw (base_name);
188 char buf[16];
189 jio_snprintf(buf, sizeof(buf), ":%d", line_no);
190 out.print_raw_cr(buf);
191 }
192 return false;
193 }
194
195 #undef is_token_break
196
197 #else
198
199 // Place-holder for non-existent suppression check:
200 #define error_is_suppressed(file_name, line_no) (false)
201
202 #endif // !PRODUCT
203
204 void report_vm_error(const char* file, int line, const char* error_msg)
205 {
206 report_vm_error(file, line, error_msg, "%s", "");
207 }
208
209 void report_vm_error(const char* file, int line, const char* error_msg, const char* detail_fmt, ...)
210 {
211 if (Debugging || error_is_suppressed(file, line)) return;
212 va_list detail_args;
213 va_start(detail_args, detail_fmt);
214 VMError::report_and_die(Thread::current_or_null(), file, line, error_msg, detail_fmt, detail_args);
215 va_end(detail_args);
216 }
217
218 void report_vm_status_error(const char* file, int line, const char* error_msg,
219 int status, const char* detail) {
220 report_vm_error(file, line, error_msg, "error %s(%d), %s", os::errno_name(status), status, detail);
221 }
222
223 void report_fatal(const char* file, int line, const char* detail_fmt, ...)
224 {
225 if (Debugging || error_is_suppressed(file, line)) return;
226 va_list detail_args;
227 va_start(detail_args, detail_fmt);
228 VMError::report_and_die(Thread::current_or_null(), file, line, "fatal error", detail_fmt, detail_args);
229 va_end(detail_args);
230 }
231
232 void report_vm_out_of_memory(const char* file, int line, size_t size,
233 VMErrorType vm_err_type, const char* detail_fmt, ...) {
234 if (Debugging) return;
235 va_list detail_args;
236 va_start(detail_args, detail_fmt);
237 VMError::report_and_die(Thread::current_or_null(), file, line, size, vm_err_type, detail_fmt, detail_args);
238 va_end(detail_args);
239
240 // The UseOSErrorReporting option in report_and_die() may allow a return
241 // to here. If so then we'll have to figure out how to handle it.
242 guarantee(false, "report_and_die() should not return here");
243 }
244
245 void report_should_not_call(const char* file, int line) {
246 report_vm_error(file, line, "ShouldNotCall()");
247 }
248
249 void report_should_not_reach_here(const char* file, int line) {
250 report_vm_error(file, line, "ShouldNotReachHere()");
251 }
252
253 void report_unimplemented(const char* file, int line) {
254 report_vm_error(file, line, "Unimplemented()");
255 }
256
257 #ifdef ASSERT
258 bool is_executing_unit_tests() {
259 return ExecutingUnitTests;
260 }
261
262 void report_assert_msg(const char* msg, ...) {
263 va_list ap;
264 va_start(ap, msg);
265
266 fprintf(stderr, "assert failed: %s\n", err_msg(FormatBufferDummy(), msg, ap).buffer());
267
268 va_end(ap);
269 }
270 #endif // ASSERT
271
272 void report_untested(const char* file, int line, const char* message) {
273 #ifndef PRODUCT
274 warning("Untested: %s in %s: %d\n", message, file, line);
275 #endif // !PRODUCT
276 }
277
278 void report_java_out_of_memory(const char* message) {
279 static int out_of_memory_reported = 0;
280
281 // A number of threads may attempt to report OutOfMemoryError at around the
282 // same time. To avoid dumping the heap or executing the data collection
283 // commands multiple times we just do it once when the first threads reports
284 // the error.
285 if (Atomic::cmpxchg(1, &out_of_memory_reported, 0) == 0) {
286 // create heap dump before OnOutOfMemoryError commands are executed
287 if (HeapDumpOnOutOfMemoryError) {
288 tty->print_cr("java.lang.OutOfMemoryError: %s", message);
289 HeapDumper::dump_heap_from_oome();
290 }
291
292 if (OnOutOfMemoryError && OnOutOfMemoryError[0]) {
293 VMError::report_java_out_of_memory(message);
294 }
295
296 if (CrashOnOutOfMemoryError) {
297 tty->print_cr("Aborting due to java.lang.OutOfMemoryError: %s", message);
298 fatal("OutOfMemory encountered: %s", message);
299 }
300
301 if (ExitOnOutOfMemoryError) {
302 tty->print_cr("Terminating due to java.lang.OutOfMemoryError: %s", message);
303 os::exit(3);
304 }
305 }
306 }
307
308 // ------ helper functions for debugging go here ------------
309
310 // All debug entries should be wrapped with a stack allocated
311 // Command object. It makes sure a resource mark is set and
312 // flushes the logfile to prevent file sharing problems.
313
314 class Command : public StackObj {
315 private:
316 ResourceMark rm;
317 ResetNoHandleMark rnhm;
318 HandleMark hm;
319 bool debug_save;
320 public:
321 static int level;
322 Command(const char* str) {
323 debug_save = Debugging;
324 Debugging = true;
325 if (level++ > 0) return;
326 tty->cr();
327 tty->print_cr("\"Executing %s\"", str);
328 }
329
330 ~Command() {
331 tty->flush();
332 Debugging = debug_save;
333 level--;
334 }
335 };
336
337 int Command::level = 0;
338
339 #ifndef PRODUCT
340
341 extern "C" void blob(CodeBlob* cb) {
342 Command c("blob");
343 cb->print();
344 }
345
346
347 extern "C" void dump_vtable(address p) {
348 Command c("dump_vtable");
349 Klass* k = (Klass*)p;
350 k->vtable().print();
351 }
352
353
354 extern "C" void nm(intptr_t p) {
355 // Actually we look through all CodeBlobs (the nm name has been kept for backwards compatability)
356 Command c("nm");
357 CodeBlob* cb = CodeCache::find_blob((address)p);
358 if (cb == NULL) {
359 tty->print_cr("NULL");
360 } else {
361 cb->print();
362 }
363 }
364
365
366 extern "C" void disnm(intptr_t p) {
367 Command c("disnm");
368 CodeBlob* cb = CodeCache::find_blob((address) p);
369 if (cb != NULL) {
370 nmethod* nm = cb->as_nmethod_or_null();
371 if (nm != NULL) {
372 nm->print();
373 } else {
374 cb->print();
375 }
376 Disassembler::decode(cb);
377 }
378 }
379
380
381 extern "C" void printnm(intptr_t p) {
382 char buffer[256];
383 sprintf(buffer, "printnm: " INTPTR_FORMAT, p);
384 Command c(buffer);
385 CodeBlob* cb = CodeCache::find_blob((address) p);
386 if (cb->is_nmethod()) {
387 nmethod* nm = (nmethod*)cb;
388 nm->print_nmethod(true);
389 }
390 }
391
392
393 extern "C" void universe() {
394 Command c("universe");
395 Universe::print_on(tty);
396 }
397
398
399 extern "C" void verify() {
400 // try to run a verify on the entire system
401 // note: this may not be safe if we're not at a safepoint; for debugging,
402 // this manipulates the safepoint settings to avoid assertion failures
403 Command c("universe verify");
404 bool safe = SafepointSynchronize::is_at_safepoint();
405 if (!safe) {
406 tty->print_cr("warning: not at safepoint -- verify may fail");
407 SafepointSynchronize::set_is_at_safepoint();
408 }
409 // Ensure Eden top is correct before verification
410 Universe::heap()->prepare_for_verify();
411 Universe::verify();
412 if (!safe) SafepointSynchronize::set_is_not_at_safepoint();
413 }
414
415
416 extern "C" void pp(void* p) {
417 Command c("pp");
418 FlagSetting fl(PrintVMMessages, true);
419 FlagSetting f2(DisplayVMOutput, true);
420 if (Universe::heap()->is_in(p)) {
421 oop obj = oop(p);
422 obj->print();
423 } else {
424 tty->print(PTR_FORMAT, p2i(p));
425 }
426 }
427
428
429 // pv: print vm-printable object
430 extern "C" void pa(intptr_t p) { ((AllocatedObj*) p)->print(); }
431 extern "C" void findpc(intptr_t x);
432
433 #endif // !PRODUCT
434
435 extern "C" void ps() { // print stack
436 if (Thread::current_or_null() == NULL) return;
437 Command c("ps");
438
439
440 // Prints the stack of the current Java thread
441 JavaThread* p = JavaThread::active();
442 tty->print(" for thread: ");
443 p->print();
444 tty->cr();
445
446 if (p->has_last_Java_frame()) {
447 // If the last_Java_fp is set we are in C land and
448 // can call the standard stack_trace function.
449 #ifdef PRODUCT
450 p->print_stack();
451 } else {
452 tty->print_cr("Cannot find the last Java frame, printing stack disabled.");
453 #else // !PRODUCT
454 p->trace_stack();
455 } else {
456 frame f = os::current_frame();
457 RegisterMap reg_map(p);
458 f = f.sender(®_map);
459 tty->print("(guessing starting frame id=" PTR_FORMAT " based on current fp)\n", p2i(f.id()));
460 p->trace_stack_from(vframe::new_vframe(&f, ®_map, p));
461 f.pd_ps();
462 #endif // PRODUCT
463 }
464
465 }
466
467 extern "C" void pfl() {
468 // print frame layout
469 Command c("pfl");
470 JavaThread* p = JavaThread::active();
471 tty->print(" for thread: ");
472 p->print();
473 tty->cr();
474 if (p->has_last_Java_frame()) {
475 p->print_frame_layout();
476 }
477 }
478
479 #ifndef PRODUCT
480
481 extern "C" void psf() { // print stack frames
482 {
483 Command c("psf");
484 JavaThread* p = JavaThread::active();
485 tty->print(" for thread: ");
486 p->print();
487 tty->cr();
488 if (p->has_last_Java_frame()) {
489 p->trace_frames();
490 }
491 }
492 }
493
494
495 extern "C" void threads() {
496 Command c("threads");
497 Threads::print(false, true);
498 }
499
500
501 extern "C" void psd() {
502 Command c("psd");
503 SystemDictionary::print();
504 }
505
506
507 extern "C" void safepoints() {
508 Command c("safepoints");
509 SafepointSynchronize::print_state();
510 }
511
512 #endif // !PRODUCT
513
514 extern "C" void pss() { // print all stacks
515 if (Thread::current_or_null() == NULL) return;
516 Command c("pss");
517 Threads::print(true, PRODUCT_ONLY(false) NOT_PRODUCT(true));
518 }
519
520 #ifndef PRODUCT
521
522 extern "C" void debug() { // to set things up for compiler debugging
523 Command c("debug");
524 WizardMode = true;
525 PrintVMMessages = PrintCompilation = true;
526 PrintInlining = PrintAssembly = true;
527 tty->flush();
528 }
529
530
531 extern "C" void ndebug() { // undo debug()
532 Command c("ndebug");
533 PrintCompilation = false;
534 PrintInlining = PrintAssembly = false;
535 tty->flush();
536 }
537
538
539 extern "C" void flush() {
540 Command c("flush");
541 tty->flush();
542 }
543
544 extern "C" void events() {
545 Command c("events");
546 Events::print();
547 }
548
549 extern "C" Method* findm(intptr_t pc) {
550 Command c("findm");
551 nmethod* nm = CodeCache::find_nmethod((address)pc);
552 return (nm == NULL) ? (Method*)NULL : nm->method();
553 }
554
555
556 extern "C" nmethod* findnm(intptr_t addr) {
557 Command c("findnm");
558 return CodeCache::find_nmethod((address)addr);
559 }
560
561 // Another interface that isn't ambiguous in dbx.
562 // Can we someday rename the other find to hsfind?
563 extern "C" void hsfind(intptr_t x) {
564 Command c("hsfind");
565 os::print_location(tty, x, false);
566 }
567
568
569 extern "C" void find(intptr_t x) {
570 Command c("find");
571 os::print_location(tty, x, false);
572 }
573
574
575 extern "C" void findpc(intptr_t x) {
576 Command c("findpc");
577 os::print_location(tty, x, true);
578 }
579
580
581 // Need method pointer to find bcp, when not in permgen.
582 extern "C" void findbcp(intptr_t method, intptr_t bcp) {
583 Command c("findbcp");
584 Method* mh = (Method*)method;
585 if (!mh->is_native()) {
586 tty->print_cr("bci_from(%p) = %d; print_codes():",
587 mh, mh->bci_from(address(bcp)));
588 mh->print_codes_on(tty);
589 }
590 }
591
592 // int versions of all methods to avoid having to type type casts in the debugger
593
594 void pp(intptr_t p) { pp((void*)p); }
595 void pp(oop p) { pp((void*)p); }
596
597 void help() {
598 Command c("help");
599 tty->print_cr("basic");
600 tty->print_cr(" pp(void* p) - try to make sense of p");
601 tty->print_cr(" pv(intptr_t p)- ((PrintableResourceObj*) p)->print()");
602 tty->print_cr(" ps() - print current thread stack");
603 tty->print_cr(" pss() - print all thread stacks");
604 tty->print_cr(" pm(int pc) - print Method* given compiled PC");
605 tty->print_cr(" findm(intptr_t pc) - finds Method*");
606 tty->print_cr(" find(intptr_t x) - finds & prints nmethod/stub/bytecode/oop based on pointer into it");
607 tty->print_cr(" pns(void* sp, void* fp, void* pc) - print native (i.e. mixed) stack trace. E.g.");
608 tty->print_cr(" pns($sp, $rbp, $pc) on Linux/amd64 and Solaris/amd64 or");
609 tty->print_cr(" pns($sp, $ebp, $pc) on Linux/x86 or");
610 tty->print_cr(" pns($sp, 0, $pc) on Linux/ppc64 or");
611 tty->print_cr(" pns($sp + 0x7ff, 0, $pc) on Solaris/SPARC");
612 tty->print_cr(" - in gdb do 'set overload-resolution off' before calling pns()");
613 tty->print_cr(" - in dbx do 'frame 1' before calling pns()");
614
615 tty->print_cr("misc.");
616 tty->print_cr(" flush() - flushes the log file");
617 tty->print_cr(" events() - dump events from ring buffers");
618
619
620 tty->print_cr("compiler debugging");
621 tty->print_cr(" debug() - to set things up for compiler debugging");
622 tty->print_cr(" ndebug() - undo debug");
623 }
624
625 extern "C" void pns(void* sp, void* fp, void* pc) { // print native stack
626 Command c("pns");
627 static char buf[O_BUFLEN];
628 Thread* t = Thread::current_or_null();
629 // Call generic frame constructor (certain arguments may be ignored)
630 frame fr(sp, fp, pc);
631 VMError::print_native_stack(tty, fr, t, buf, sizeof(buf));
632 }
633
634 #endif // !PRODUCT
635
636 //////////////////////////////////////////////////////////////////////////////
637 // Test multiple STATIC_ASSERT forms in various scopes.
638
639 #ifndef PRODUCT
640
641 // namespace scope
642 STATIC_ASSERT(true);
643 STATIC_ASSERT(true);
644 STATIC_ASSERT(1 == 1);
645 STATIC_ASSERT(0 == 0);
646
647 void test_multiple_static_assert_forms_in_function_scope() {
648 STATIC_ASSERT(true);
649 STATIC_ASSERT(true);
650 STATIC_ASSERT(0 == 0);
651 STATIC_ASSERT(1 == 1);
652 }
653
654 // class scope
655 struct TestMultipleStaticAssertFormsInClassScope {
656 STATIC_ASSERT(true);
657 STATIC_ASSERT(true);
658 STATIC_ASSERT(0 == 0);
659 STATIC_ASSERT(1 == 1);
660 };
661
662 #endif // !PRODUCT