Wed, 13 Mar 2013 15:15:56 -0400
8009829: CDS: JDK JPRT test fails crash in Symbol::equals()
Summary: -Xshare:dump was creating a Symbol in C_heap. There's an assert there that jdk jprt wasn't hitting because it was only done in product
Reviewed-by: dholmes, hseigel, iklam
1 /*
2 * Copyright (c) 2008, 2012, 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 "classfile/javaClasses.hpp"
27 #include "code/codeCache.hpp"
28 #include "compiler/disassembler.hpp"
29 #include "gc_interface/collectedHeap.hpp"
30 #include "memory/cardTableModRefBS.hpp"
31 #include "runtime/fprofiler.hpp"
32 #include "runtime/handles.inline.hpp"
33 #include "runtime/stubCodeGenerator.hpp"
34 #include "runtime/stubRoutines.hpp"
35 #ifdef TARGET_ARCH_x86
36 # include "depChecker_x86.hpp"
37 #endif
38 #ifdef TARGET_ARCH_sparc
39 # include "depChecker_sparc.hpp"
40 #endif
41 #ifdef TARGET_ARCH_zero
42 # include "depChecker_zero.hpp"
43 #endif
44 #ifdef TARGET_ARCH_arm
45 # include "depChecker_arm.hpp"
46 #endif
47 #ifdef TARGET_ARCH_ppc
48 # include "depChecker_ppc.hpp"
49 #endif
50 #ifdef SHARK
51 #include "shark/sharkEntry.hpp"
52 #endif
54 void* Disassembler::_library = NULL;
55 bool Disassembler::_tried_to_load_library = false;
57 // This routine is in the shared library:
58 Disassembler::decode_func_virtual Disassembler::_decode_instructions_virtual = NULL;
59 Disassembler::decode_func Disassembler::_decode_instructions = NULL;
61 static const char hsdis_library_name[] = "hsdis-"HOTSPOT_LIB_ARCH;
62 static const char decode_instructions_virtual_name[] = "decode_instructions_virtual";
63 static const char decode_instructions_name[] = "decode_instructions";
64 static bool use_new_version = true;
65 #define COMMENT_COLUMN 40 LP64_ONLY(+8) /*could be an option*/
66 #define BYTES_COMMENT ";..." /* funky byte display comment */
68 bool Disassembler::load_library() {
69 if (_decode_instructions_virtual != NULL || _decode_instructions != NULL) {
70 // Already succeeded.
71 return true;
72 }
73 if (_tried_to_load_library) {
74 // Do not try twice.
75 // To force retry in debugger: assign _tried_to_load_library=0
76 return false;
77 }
78 // Try to load it.
79 char ebuf[1024];
80 char buf[JVM_MAXPATHLEN];
81 os::jvm_path(buf, sizeof(buf));
82 int jvm_offset = -1;
83 int lib_offset = -1;
84 {
85 // Match "jvm[^/]*" in jvm_path.
86 const char* base = buf;
87 const char* p = strrchr(buf, '/');
88 if (p != NULL) lib_offset = p - base + 1;
89 p = strstr(p ? p : base, "jvm");
90 if (p != NULL) jvm_offset = p - base;
91 }
92 // Find the disassembler shared library.
93 // Search for several paths derived from libjvm, in this order:
94 // 1. <home>/jre/lib/<arch>/<vm>/libhsdis-<arch>.so (for compatibility)
95 // 2. <home>/jre/lib/<arch>/<vm>/hsdis-<arch>.so
96 // 3. <home>/jre/lib/<arch>/hsdis-<arch>.so
97 // 4. hsdis-<arch>.so (using LD_LIBRARY_PATH)
98 if (jvm_offset >= 0) {
99 // 1. <home>/jre/lib/<arch>/<vm>/libhsdis-<arch>.so
100 strcpy(&buf[jvm_offset], hsdis_library_name);
101 strcat(&buf[jvm_offset], os::dll_file_extension());
102 _library = os::dll_load(buf, ebuf, sizeof ebuf);
103 if (_library == NULL) {
104 // 2. <home>/jre/lib/<arch>/<vm>/hsdis-<arch>.so
105 strcpy(&buf[lib_offset], hsdis_library_name);
106 strcat(&buf[lib_offset], os::dll_file_extension());
107 _library = os::dll_load(buf, ebuf, sizeof ebuf);
108 }
109 if (_library == NULL) {
110 // 3. <home>/jre/lib/<arch>/hsdis-<arch>.so
111 buf[lib_offset - 1] = '\0';
112 const char* p = strrchr(buf, '/');
113 if (p != NULL) {
114 lib_offset = p - buf + 1;
115 strcpy(&buf[lib_offset], hsdis_library_name);
116 strcat(&buf[lib_offset], os::dll_file_extension());
117 _library = os::dll_load(buf, ebuf, sizeof ebuf);
118 }
119 }
120 }
121 if (_library == NULL) {
122 // 4. hsdis-<arch>.so (using LD_LIBRARY_PATH)
123 strcpy(&buf[0], hsdis_library_name);
124 strcat(&buf[0], os::dll_file_extension());
125 _library = os::dll_load(buf, ebuf, sizeof ebuf);
126 }
127 if (_library != NULL) {
128 _decode_instructions_virtual = CAST_TO_FN_PTR(Disassembler::decode_func_virtual,
129 os::dll_lookup(_library, decode_instructions_virtual_name));
130 }
131 if (_decode_instructions_virtual == NULL) {
132 // could not spot in new version, try old version
133 _decode_instructions = CAST_TO_FN_PTR(Disassembler::decode_func,
134 os::dll_lookup(_library, decode_instructions_name));
135 use_new_version = false;
136 } else {
137 use_new_version = true;
138 }
139 _tried_to_load_library = true;
140 if (_decode_instructions_virtual == NULL && _decode_instructions == NULL) {
141 tty->print_cr("Could not load %s; %s; %s", buf,
142 ((_library != NULL)
143 ? "entry point is missing"
144 : (WizardMode || PrintMiscellaneous)
145 ? (const char*)ebuf
146 : "library not loadable"),
147 "PrintAssembly is disabled");
148 return false;
149 }
151 // Success.
152 tty->print_cr("Loaded disassembler from %s", buf);
153 return true;
154 }
157 class decode_env {
158 private:
159 nmethod* _nm;
160 CodeBlob* _code;
161 CodeComments _comments;
162 outputStream* _output;
163 address _start, _end;
165 char _option_buf[512];
166 char _print_raw;
167 bool _print_pc;
168 bool _print_bytes;
169 address _cur_insn;
170 int _total_ticks;
171 int _bytes_per_line; // arch-specific formatting option
173 static bool match(const char* event, const char* tag) {
174 size_t taglen = strlen(tag);
175 if (strncmp(event, tag, taglen) != 0)
176 return false;
177 char delim = event[taglen];
178 return delim == '\0' || delim == ' ' || delim == '/' || delim == '=';
179 }
181 void collect_options(const char* p) {
182 if (p == NULL || p[0] == '\0') return;
183 size_t opt_so_far = strlen(_option_buf);
184 if (opt_so_far + 1 + strlen(p) + 1 > sizeof(_option_buf)) return;
185 char* fillp = &_option_buf[opt_so_far];
186 if (opt_so_far > 0) *fillp++ = ',';
187 strcat(fillp, p);
188 // replace white space by commas:
189 char* q = fillp;
190 while ((q = strpbrk(q, " \t\n")) != NULL)
191 *q++ = ',';
192 // Note that multiple PrintAssemblyOptions flags accumulate with \n,
193 // which we want to be changed to a comma...
194 }
196 void print_insn_labels();
197 void print_insn_bytes(address pc0, address pc);
198 void print_address(address value);
200 public:
201 decode_env(CodeBlob* code, outputStream* output, CodeComments c = CodeComments());
203 address decode_instructions(address start, address end);
205 void start_insn(address pc) {
206 _cur_insn = pc;
207 output()->bol();
208 print_insn_labels();
209 }
211 void end_insn(address pc) {
212 address pc0 = cur_insn();
213 outputStream* st = output();
214 if (_print_bytes && pc > pc0)
215 print_insn_bytes(pc0, pc);
216 if (_nm != NULL) {
217 _nm->print_code_comment_on(st, COMMENT_COLUMN, pc0, pc);
218 // this calls reloc_string_for which calls oop::print_value_on
219 }
221 // Output pc bucket ticks if we have any
222 if (total_ticks() != 0) {
223 address bucket_pc = FlatProfiler::bucket_start_for(pc);
224 if (bucket_pc != NULL && bucket_pc > pc0 && bucket_pc <= pc) {
225 int bucket_count = FlatProfiler::bucket_count_for(pc0);
226 if (bucket_count != 0) {
227 st->bol();
228 st->print_cr("%3.1f%% [%d]", bucket_count*100.0/total_ticks(), bucket_count);
229 }
230 }
231 }
232 // follow each complete insn by a nice newline
233 st->cr();
234 }
236 address handle_event(const char* event, address arg);
238 outputStream* output() { return _output; }
239 address cur_insn() { return _cur_insn; }
240 int total_ticks() { return _total_ticks; }
241 void set_total_ticks(int n) { _total_ticks = n; }
242 const char* options() { return _option_buf; }
243 };
245 decode_env::decode_env(CodeBlob* code, outputStream* output, CodeComments c) {
246 memset(this, 0, sizeof(*this));
247 _output = output ? output : tty;
248 _code = code;
249 if (code != NULL && code->is_nmethod())
250 _nm = (nmethod*) code;
251 _comments.assign(c);
253 // by default, output pc but not bytes:
254 _print_pc = true;
255 _print_bytes = false;
256 _bytes_per_line = Disassembler::pd_instruction_alignment();
258 // parse the global option string:
259 collect_options(Disassembler::pd_cpu_opts());
260 collect_options(PrintAssemblyOptions);
262 if (strstr(options(), "hsdis-")) {
263 if (strstr(options(), "hsdis-print-raw"))
264 _print_raw = (strstr(options(), "xml") ? 2 : 1);
265 if (strstr(options(), "hsdis-print-pc"))
266 _print_pc = !_print_pc;
267 if (strstr(options(), "hsdis-print-bytes"))
268 _print_bytes = !_print_bytes;
269 }
270 if (strstr(options(), "help")) {
271 tty->print_cr("PrintAssemblyOptions help:");
272 tty->print_cr(" hsdis-print-raw test plugin by requesting raw output");
273 tty->print_cr(" hsdis-print-raw-xml test plugin by requesting raw xml");
274 tty->print_cr(" hsdis-print-pc turn off PC printing (on by default)");
275 tty->print_cr(" hsdis-print-bytes turn on instruction byte output");
276 tty->print_cr("combined options: %s", options());
277 }
278 }
280 address decode_env::handle_event(const char* event, address arg) {
281 if (match(event, "insn")) {
282 start_insn(arg);
283 } else if (match(event, "/insn")) {
284 end_insn(arg);
285 } else if (match(event, "addr")) {
286 if (arg != NULL) {
287 print_address(arg);
288 return arg;
289 }
290 } else if (match(event, "mach")) {
291 static char buffer[32] = { 0, };
292 if (strcmp(buffer, (const char*)arg) != 0 ||
293 strlen((const char*)arg) > sizeof(buffer) - 1) {
294 // Only print this when the mach changes
295 strncpy(buffer, (const char*)arg, sizeof(buffer) - 1);
296 output()->print_cr("[Disassembling for mach='%s']", arg);
297 }
298 } else if (match(event, "format bytes-per-line")) {
299 _bytes_per_line = (int) (intptr_t) arg;
300 } else {
301 // ignore unrecognized markup
302 }
303 return NULL;
304 }
306 // called by the disassembler to print out jump targets and data addresses
307 void decode_env::print_address(address adr) {
308 outputStream* st = _output;
310 if (adr == NULL) {
311 st->print("NULL");
312 return;
313 }
315 int small_num = (int)(intptr_t)adr;
316 if ((intptr_t)adr == (intptr_t)small_num
317 && -1 <= small_num && small_num <= 9) {
318 st->print("%d", small_num);
319 return;
320 }
322 if (Universe::is_fully_initialized()) {
323 if (StubRoutines::contains(adr)) {
324 StubCodeDesc* desc = StubCodeDesc::desc_for(adr);
325 if (desc == NULL)
326 desc = StubCodeDesc::desc_for(adr + frame::pc_return_offset);
327 if (desc != NULL) {
328 st->print("Stub::%s", desc->name());
329 if (desc->begin() != adr)
330 st->print("%+d 0x%p",adr - desc->begin(), adr);
331 else if (WizardMode) st->print(" " PTR_FORMAT, adr);
332 return;
333 }
334 st->print("Stub::<unknown> " PTR_FORMAT, adr);
335 return;
336 }
338 BarrierSet* bs = Universe::heap()->barrier_set();
339 if (bs->kind() == BarrierSet::CardTableModRef &&
340 adr == (address)((CardTableModRefBS*)(bs))->byte_map_base) {
341 st->print("word_map_base");
342 if (WizardMode) st->print(" " INTPTR_FORMAT, (intptr_t)adr);
343 return;
344 }
346 oop obj;
347 if (_nm != NULL
348 && (obj = _nm->embeddedOop_at(cur_insn())) != NULL
349 && (address) obj == adr
350 && Universe::heap()->is_in(obj)
351 && Universe::heap()->is_in(obj->klass())) {
352 julong c = st->count();
353 obj->print_value_on(st);
354 if (st->count() == c) {
355 // No output. (Can happen in product builds.)
356 st->print("(a %s)", obj->klass()->external_name());
357 }
358 return;
359 }
360 }
362 // Fall through to a simple (hexadecimal) numeral.
363 st->print(PTR_FORMAT, adr);
364 }
366 void decode_env::print_insn_labels() {
367 address p = cur_insn();
368 outputStream* st = output();
369 CodeBlob* cb = _code;
370 if (cb != NULL) {
371 cb->print_block_comment(st, p);
372 }
373 _comments.print_block_comment(st, (intptr_t)(p - _start));
374 if (_print_pc) {
375 st->print(" " PTR_FORMAT ": ", p);
376 }
377 }
379 void decode_env::print_insn_bytes(address pc, address pc_limit) {
380 outputStream* st = output();
381 size_t incr = 1;
382 size_t perline = _bytes_per_line;
383 if ((size_t) Disassembler::pd_instruction_alignment() >= sizeof(int)
384 && !((uintptr_t)pc % sizeof(int))
385 && !((uintptr_t)pc_limit % sizeof(int))) {
386 incr = sizeof(int);
387 if (perline % incr) perline += incr - (perline % incr);
388 }
389 while (pc < pc_limit) {
390 // tab to the desired column:
391 st->move_to(COMMENT_COLUMN);
392 address pc0 = pc;
393 address pc1 = pc + perline;
394 if (pc1 > pc_limit) pc1 = pc_limit;
395 for (; pc < pc1; pc += incr) {
396 if (pc == pc0)
397 st->print(BYTES_COMMENT);
398 else if ((uint)(pc - pc0) % sizeof(int) == 0)
399 st->print(" "); // put out a space on word boundaries
400 if (incr == sizeof(int))
401 st->print("%08lx", *(int*)pc);
402 else st->print("%02x", (*pc)&0xFF);
403 }
404 st->cr();
405 }
406 }
409 static void* event_to_env(void* env_pv, const char* event, void* arg) {
410 decode_env* env = (decode_env*) env_pv;
411 return env->handle_event(event, (address) arg);
412 }
414 static int printf_to_env(void* env_pv, const char* format, ...) {
415 decode_env* env = (decode_env*) env_pv;
416 outputStream* st = env->output();
417 size_t flen = strlen(format);
418 const char* raw = NULL;
419 if (flen == 0) return 0;
420 if (flen == 1 && format[0] == '\n') { st->bol(); return 1; }
421 if (flen < 2 ||
422 strchr(format, '%') == NULL) {
423 raw = format;
424 } else if (format[0] == '%' && format[1] == '%' &&
425 strchr(format+2, '%') == NULL) {
426 // happens a lot on machines with names like %foo
427 flen--;
428 raw = format+1;
429 }
430 if (raw != NULL) {
431 st->print_raw(raw, (int) flen);
432 return (int) flen;
433 }
434 va_list ap;
435 va_start(ap, format);
436 julong cnt0 = st->count();
437 st->vprint(format, ap);
438 julong cnt1 = st->count();
439 va_end(ap);
440 return (int)(cnt1 - cnt0);
441 }
443 address decode_env::decode_instructions(address start, address end) {
444 _start = start; _end = end;
446 assert(((((intptr_t)start | (intptr_t)end) % Disassembler::pd_instruction_alignment()) == 0), "misaligned insn addr");
448 const int show_bytes = false; // for disassembler debugging
450 //_version = Disassembler::pd_cpu_version();
452 if (!Disassembler::can_decode()) {
453 return NULL;
454 }
456 // decode a series of instructions and return the end of the last instruction
458 if (_print_raw) {
459 // Print whatever the library wants to print, w/o fancy callbacks.
460 // This is mainly for debugging the library itself.
461 FILE* out = stdout;
462 FILE* xmlout = (_print_raw > 1 ? out : NULL);
463 return use_new_version ?
464 (address)
465 (*Disassembler::_decode_instructions_virtual)((uintptr_t)start, (uintptr_t)end,
466 start, end - start,
467 NULL, (void*) xmlout,
468 NULL, (void*) out,
469 options(), 0/*nice new line*/)
470 :
471 (address)
472 (*Disassembler::_decode_instructions)(start, end,
473 NULL, (void*) xmlout,
474 NULL, (void*) out,
475 options());
476 }
478 return use_new_version ?
479 (address)
480 (*Disassembler::_decode_instructions_virtual)((uintptr_t)start, (uintptr_t)end,
481 start, end - start,
482 &event_to_env, (void*) this,
483 &printf_to_env, (void*) this,
484 options(), 0/*nice new line*/)
485 :
486 (address)
487 (*Disassembler::_decode_instructions)(start, end,
488 &event_to_env, (void*) this,
489 &printf_to_env, (void*) this,
490 options());
491 }
494 void Disassembler::decode(CodeBlob* cb, outputStream* st) {
495 if (!load_library()) return;
496 decode_env env(cb, st);
497 env.output()->print_cr("Decoding CodeBlob " PTR_FORMAT, cb);
498 env.decode_instructions(cb->code_begin(), cb->code_end());
499 }
501 void Disassembler::decode(address start, address end, outputStream* st, CodeComments c) {
502 if (!load_library()) return;
503 decode_env env(CodeCache::find_blob_unsafe(start), st, c);
504 env.decode_instructions(start, end);
505 }
507 void Disassembler::decode(nmethod* nm, outputStream* st) {
508 if (!load_library()) return;
509 decode_env env(nm, st);
510 env.output()->print_cr("Decoding compiled method " PTR_FORMAT ":", nm);
511 env.output()->print_cr("Code:");
513 #ifdef SHARK
514 SharkEntry* entry = (SharkEntry *) nm->code_begin();
515 unsigned char* p = entry->code_start();
516 unsigned char* end = entry->code_limit();
517 #else
518 unsigned char* p = nm->code_begin();
519 unsigned char* end = nm->code_end();
520 #endif // SHARK
522 // If there has been profiling, print the buckets.
523 if (FlatProfiler::bucket_start_for(p) != NULL) {
524 unsigned char* p1 = p;
525 int total_bucket_count = 0;
526 while (p1 < end) {
527 unsigned char* p0 = p1;
528 p1 += pd_instruction_alignment();
529 address bucket_pc = FlatProfiler::bucket_start_for(p1);
530 if (bucket_pc != NULL && bucket_pc > p0 && bucket_pc <= p1)
531 total_bucket_count += FlatProfiler::bucket_count_for(p0);
532 }
533 env.set_total_ticks(total_bucket_count);
534 }
536 // Print constant table.
537 if (nm->consts_size() > 0) {
538 nm->print_nmethod_labels(env.output(), nm->consts_begin());
539 int offset = 0;
540 for (address p = nm->consts_begin(); p < nm->consts_end(); p += 4, offset += 4) {
541 if ((offset % 8) == 0) {
542 env.output()->print_cr(" " PTR_FORMAT " (offset: %4d): " PTR32_FORMAT " " PTR64_FORMAT, p, offset, *((int32_t*) p), *((int64_t*) p));
543 } else {
544 env.output()->print_cr(" " PTR_FORMAT " (offset: %4d): " PTR32_FORMAT, p, offset, *((int32_t*) p));
545 }
546 }
547 }
549 env.decode_instructions(p, end);
550 }