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comparison: src/share/vm/compiler/disassembler.cpp

src/share/vm/compiler/disassembler.cpp

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1 /*
2 * Copyright (c) 2008, 2014, 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 "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
53
54 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
55
56 void* Disassembler::_library = NULL;
57 bool Disassembler::_tried_to_load_library = false;
58
59 // This routine is in the shared library:
60 Disassembler::decode_func_virtual Disassembler::_decode_instructions_virtual = NULL;
61 Disassembler::decode_func Disassembler::_decode_instructions = NULL;
62
63 static const char hsdis_library_name[] = "hsdis-"HOTSPOT_LIB_ARCH;
64 static const char decode_instructions_virtual_name[] = "decode_instructions_virtual";
65 static const char decode_instructions_name[] = "decode_instructions";
66 static bool use_new_version = true;
67 #define COMMENT_COLUMN 40 LP64_ONLY(+8) /*could be an option*/
68 #define BYTES_COMMENT ";..." /* funky byte display comment */
69
70 bool Disassembler::load_library() {
71 if (_decode_instructions_virtual != NULL || _decode_instructions != NULL) {
72 // Already succeeded.
73 return true;
74 }
75 if (_tried_to_load_library) {
76 // Do not try twice.
77 // To force retry in debugger: assign _tried_to_load_library=0
78 return false;
79 }
80 // Try to load it.
81 char ebuf[1024];
82 char buf[JVM_MAXPATHLEN];
83 os::jvm_path(buf, sizeof(buf));
84 int jvm_offset = -1;
85 int lib_offset = -1;
86 {
87 // Match "jvm[^/]*" in jvm_path.
88 const char* base = buf;
89 const char* p = strrchr(buf, '/');
90 if (p != NULL) lib_offset = p - base + 1;
91 p = strstr(p ? p : base, "jvm");
92 if (p != NULL) jvm_offset = p - base;
93 }
94 // Find the disassembler shared library.
95 // Search for several paths derived from libjvm, in this order:
96 // 1. <home>/jre/lib/<arch>/<vm>/libhsdis-<arch>.so (for compatibility)
97 // 2. <home>/jre/lib/<arch>/<vm>/hsdis-<arch>.so
98 // 3. <home>/jre/lib/<arch>/hsdis-<arch>.so
99 // 4. hsdis-<arch>.so (using LD_LIBRARY_PATH)
100 if (jvm_offset >= 0) {
101 // 1. <home>/jre/lib/<arch>/<vm>/libhsdis-<arch>.so
102 strcpy(&buf[jvm_offset], hsdis_library_name);
103 strcat(&buf[jvm_offset], os::dll_file_extension());
104 _library = os::dll_load(buf, ebuf, sizeof ebuf);
105 if (_library == NULL) {
106 // 2. <home>/jre/lib/<arch>/<vm>/hsdis-<arch>.so
107 strcpy(&buf[lib_offset], hsdis_library_name);
108 strcat(&buf[lib_offset], os::dll_file_extension());
109 _library = os::dll_load(buf, ebuf, sizeof ebuf);
110 }
111 if (_library == NULL) {
112 // 3. <home>/jre/lib/<arch>/hsdis-<arch>.so
113 buf[lib_offset - 1] = '\0';
114 const char* p = strrchr(buf, '/');
115 if (p != NULL) {
116 lib_offset = p - buf + 1;
117 strcpy(&buf[lib_offset], hsdis_library_name);
118 strcat(&buf[lib_offset], os::dll_file_extension());
119 _library = os::dll_load(buf, ebuf, sizeof ebuf);
120 }
121 }
122 }
123 if (_library == NULL) {
124 // 4. hsdis-<arch>.so (using LD_LIBRARY_PATH)
125 strcpy(&buf[0], hsdis_library_name);
126 strcat(&buf[0], os::dll_file_extension());
127 _library = os::dll_load(buf, ebuf, sizeof ebuf);
128 }
129 if (_library != NULL) {
130 _decode_instructions_virtual = CAST_TO_FN_PTR(Disassembler::decode_func_virtual,
131 os::dll_lookup(_library, decode_instructions_virtual_name));
132 }
133 if (_decode_instructions_virtual == NULL) {
134 // could not spot in new version, try old version
135 _decode_instructions = CAST_TO_FN_PTR(Disassembler::decode_func,
136 os::dll_lookup(_library, decode_instructions_name));
137 use_new_version = false;
138 } else {
139 use_new_version = true;
140 }
141 _tried_to_load_library = true;
142 if (_decode_instructions_virtual == NULL && _decode_instructions == NULL) {
143 tty->print_cr("Could not load %s; %s; %s", buf,
144 ((_library != NULL)
145 ? "entry point is missing"
146 : (WizardMode || PrintMiscellaneous)
147 ? (const char*)ebuf
148 : "library not loadable"),
149 "PrintAssembly is disabled");
150 return false;
151 }
152
153 // Success.
154 tty->print_cr("Loaded disassembler from %s", buf);
155 return true;
156 }
157
158
159 class decode_env {
160 private:
161 nmethod* _nm;
162 CodeBlob* _code;
163 CodeStrings _strings;
164 outputStream* _output;
165 address _start, _end;
166
167 char _option_buf[512];
168 char _print_raw;
169 bool _print_pc;
170 bool _print_bytes;
171 address _cur_insn;
172 int _total_ticks;
173 int _bytes_per_line; // arch-specific formatting option
174
175 static bool match(const char* event, const char* tag) {
176 size_t taglen = strlen(tag);
177 if (strncmp(event, tag, taglen) != 0)
178 return false;
179 char delim = event[taglen];
180 return delim == '\0' || delim == ' ' || delim == '/' || delim == '=';
181 }
182
183 void collect_options(const char* p) {
184 if (p == NULL || p[0] == '\0') return;
185 size_t opt_so_far = strlen(_option_buf);
186 if (opt_so_far + 1 + strlen(p) + 1 > sizeof(_option_buf)) return;
187 char* fillp = &_option_buf[opt_so_far];
188 if (opt_so_far > 0) *fillp++ = ',';
189 strcat(fillp, p);
190 // replace white space by commas:
191 char* q = fillp;
192 while ((q = strpbrk(q, " \t\n")) != NULL)
193 *q++ = ',';
194 // Note that multiple PrintAssemblyOptions flags accumulate with \n,
195 // which we want to be changed to a comma...
196 }
197
198 void print_insn_labels();
199 void print_insn_bytes(address pc0, address pc);
200 void print_address(address value);
201
202 public:
203 decode_env(CodeBlob* code, outputStream* output, CodeStrings c = CodeStrings());
204
205 address decode_instructions(address start, address end);
206
207 void start_insn(address pc) {
208 _cur_insn = pc;
209 output()->bol();
210 print_insn_labels();
211 }
212
213 void end_insn(address pc) {
214 address pc0 = cur_insn();
215 outputStream* st = output();
216 if (_print_bytes && pc > pc0)
217 print_insn_bytes(pc0, pc);
218 if (_nm != NULL) {
219 _nm->print_code_comment_on(st, COMMENT_COLUMN, pc0, pc);
220 // this calls reloc_string_for which calls oop::print_value_on
221 }
222
223 // Output pc bucket ticks if we have any
224 if (total_ticks() != 0) {
225 address bucket_pc = FlatProfiler::bucket_start_for(pc);
226 if (bucket_pc != NULL && bucket_pc > pc0 && bucket_pc <= pc) {
227 int bucket_count = FlatProfiler::bucket_count_for(pc0);
228 if (bucket_count != 0) {
229 st->bol();
230 st->print_cr("%3.1f%% [%d]", bucket_count*100.0/total_ticks(), bucket_count);
231 }
232 }
233 }
234 // follow each complete insn by a nice newline
235 st->cr();
236 }
237
238 address handle_event(const char* event, address arg);
239
240 outputStream* output() { return _output; }
241 address cur_insn() { return _cur_insn; }
242 int total_ticks() { return _total_ticks; }
243 void set_total_ticks(int n) { _total_ticks = n; }
244 const char* options() { return _option_buf; }
245 };
246
247 decode_env::decode_env(CodeBlob* code, outputStream* output, CodeStrings c) {
248 memset(this, 0, sizeof(*this));
249 _output = output ? output : tty;
250 _code = code;
251 if (code != NULL && code->is_nmethod())
252 _nm = (nmethod*) code;
253 _strings.assign(c);
254
255 // by default, output pc but not bytes:
256 _print_pc = true;
257 _print_bytes = false;
258 _bytes_per_line = Disassembler::pd_instruction_alignment();
259
260 // parse the global option string:
261 collect_options(Disassembler::pd_cpu_opts());
262 collect_options(PrintAssemblyOptions);
263
264 if (strstr(options(), "hsdis-")) {
265 if (strstr(options(), "hsdis-print-raw"))
266 _print_raw = (strstr(options(), "xml") ? 2 : 1);
267 if (strstr(options(), "hsdis-print-pc"))
268 _print_pc = !_print_pc;
269 if (strstr(options(), "hsdis-print-bytes"))
270 _print_bytes = !_print_bytes;
271 }
272 if (strstr(options(), "help")) {
273 tty->print_cr("PrintAssemblyOptions help:");
274 tty->print_cr(" hsdis-print-raw test plugin by requesting raw output");
275 tty->print_cr(" hsdis-print-raw-xml test plugin by requesting raw xml");
276 tty->print_cr(" hsdis-print-pc turn off PC printing (on by default)");
277 tty->print_cr(" hsdis-print-bytes turn on instruction byte output");
278 tty->print_cr("combined options: %s", options());
279 }
280 }
281
282 address decode_env::handle_event(const char* event, address arg) {
283 if (match(event, "insn")) {
284 start_insn(arg);
285 } else if (match(event, "/insn")) {
286 end_insn(arg);
287 } else if (match(event, "addr")) {
288 if (arg != NULL) {
289 print_address(arg);
290 return arg;
291 }
292 } else if (match(event, "mach")) {
293 static char buffer[32] = { 0, };
294 if (strcmp(buffer, (const char*)arg) != 0 ||
295 strlen((const char*)arg) > sizeof(buffer) - 1) {
296 // Only print this when the mach changes
297 strncpy(buffer, (const char*)arg, sizeof(buffer) - 1);
298 output()->print_cr("[Disassembling for mach='%s']", arg);
299 }
300 } else if (match(event, "format bytes-per-line")) {
301 _bytes_per_line = (int) (intptr_t) arg;
302 } else {
303 // ignore unrecognized markup
304 }
305 return NULL;
306 }
307
308 // called by the disassembler to print out jump targets and data addresses
309 void decode_env::print_address(address adr) {
310 outputStream* st = _output;
311
312 if (adr == NULL) {
313 st->print("NULL");
314 return;
315 }
316
317 int small_num = (int)(intptr_t)adr;
318 if ((intptr_t)adr == (intptr_t)small_num
319 && -1 <= small_num && small_num <= 9) {
320 st->print("%d", small_num);
321 return;
322 }
323
324 if (Universe::is_fully_initialized()) {
325 if (StubRoutines::contains(adr)) {
326 StubCodeDesc* desc = StubCodeDesc::desc_for(adr);
327 if (desc == NULL)
328 desc = StubCodeDesc::desc_for(adr + frame::pc_return_offset);
329 if (desc != NULL) {
330 st->print("Stub::%s", desc->name());
331 if (desc->begin() != adr)
332 st->print("%+d 0x%p",adr - desc->begin(), adr);
333 else if (WizardMode) st->print(" " PTR_FORMAT, adr);
334 return;
335 }
336 st->print("Stub::<unknown> " PTR_FORMAT, adr);
337 return;
338 }
339
340 BarrierSet* bs = Universe::heap()->barrier_set();
341 if (bs->kind() == BarrierSet::CardTableModRef &&
342 adr == (address)((CardTableModRefBS*)(bs))->byte_map_base) {
343 st->print("word_map_base");
344 if (WizardMode) st->print(" " INTPTR_FORMAT, (intptr_t)adr);
345 return;
346 }
347
348 oop obj;
349 if (_nm != NULL
350 && (obj = _nm->embeddedOop_at(cur_insn())) != NULL
351 && (address) obj == adr
352 && Universe::heap()->is_in(obj)
353 && Universe::heap()->is_in(obj->klass())) {
354 julong c = st->count();
355 obj->print_value_on(st);
356 if (st->count() == c) {
357 // No output. (Can happen in product builds.)
358 st->print("(a %s)", obj->klass()->external_name());
359 }
360 return;
361 }
362 }
363
364 // Fall through to a simple (hexadecimal) numeral.
365 st->print(PTR_FORMAT, adr);
366 }
367
368 void decode_env::print_insn_labels() {
369 address p = cur_insn();
370 outputStream* st = output();
371 CodeBlob* cb = _code;
372 if (cb != NULL) {
373 cb->print_block_comment(st, p);
374 }
375 _strings.print_block_comment(st, (intptr_t)(p - _start));
376 if (_print_pc) {
377 st->print(" " PTR_FORMAT ": ", p);
378 }
379 }
380
381 void decode_env::print_insn_bytes(address pc, address pc_limit) {
382 outputStream* st = output();
383 size_t incr = 1;
384 size_t perline = _bytes_per_line;
385 if ((size_t) Disassembler::pd_instruction_alignment() >= sizeof(int)
386 && !((uintptr_t)pc % sizeof(int))
387 && !((uintptr_t)pc_limit % sizeof(int))) {
388 incr = sizeof(int);
389 if (perline % incr) perline += incr - (perline % incr);
390 }
391 while (pc < pc_limit) {
392 // tab to the desired column:
393 st->move_to(COMMENT_COLUMN);
394 address pc0 = pc;
395 address pc1 = pc + perline;
396 if (pc1 > pc_limit) pc1 = pc_limit;
397 for (; pc < pc1; pc += incr) {
398 if (pc == pc0)
399 st->print(BYTES_COMMENT);
400 else if ((uint)(pc - pc0) % sizeof(int) == 0)
401 st->print(" "); // put out a space on word boundaries
402 if (incr == sizeof(int))
403 st->print("%08lx", *(int*)pc);
404 else st->print("%02x", (*pc)&0xFF);
405 }
406 st->cr();
407 }
408 }
409
410
411 static void* event_to_env(void* env_pv, const char* event, void* arg) {
412 decode_env* env = (decode_env*) env_pv;
413 return env->handle_event(event, (address) arg);
414 }
415
416 ATTRIBUTE_PRINTF(2, 3)
417 static int printf_to_env(void* env_pv, const char* format, ...) {
418 decode_env* env = (decode_env*) env_pv;
419 outputStream* st = env->output();
420 size_t flen = strlen(format);
421 const char* raw = NULL;
422 if (flen == 0) return 0;
423 if (flen == 1 && format[0] == '\n') { st->bol(); return 1; }
424 if (flen < 2 ||
425 strchr(format, '%') == NULL) {
426 raw = format;
427 } else if (format[0] == '%' && format[1] == '%' &&
428 strchr(format+2, '%') == NULL) {
429 // happens a lot on machines with names like %foo
430 flen--;
431 raw = format+1;
432 }
433 if (raw != NULL) {
434 st->print_raw(raw, (int) flen);
435 return (int) flen;
436 }
437 va_list ap;
438 va_start(ap, format);
439 julong cnt0 = st->count();
440 st->vprint(format, ap);
441 julong cnt1 = st->count();
442 va_end(ap);
443 return (int)(cnt1 - cnt0);
444 }
445
446 address decode_env::decode_instructions(address start, address end) {
447 _start = start; _end = end;
448
449 assert(((((intptr_t)start | (intptr_t)end) % Disassembler::pd_instruction_alignment()) == 0), "misaligned insn addr");
450
451 const int show_bytes = false; // for disassembler debugging
452
453 //_version = Disassembler::pd_cpu_version();
454
455 if (!Disassembler::can_decode()) {
456 return NULL;
457 }
458
459 // decode a series of instructions and return the end of the last instruction
460
461 if (_print_raw) {
462 // Print whatever the library wants to print, w/o fancy callbacks.
463 // This is mainly for debugging the library itself.
464 FILE* out = stdout;
465 FILE* xmlout = (_print_raw > 1 ? out : NULL);
466 return use_new_version ?
467 (address)
468 (*Disassembler::_decode_instructions_virtual)((uintptr_t)start, (uintptr_t)end,
469 start, end - start,
470 NULL, (void*) xmlout,
471 NULL, (void*) out,
472 options(), 0/*nice new line*/)
473 :
474 (address)
475 (*Disassembler::_decode_instructions)(start, end,
476 NULL, (void*) xmlout,
477 NULL, (void*) out,
478 options());
479 }
480
481 return use_new_version ?
482 (address)
483 (*Disassembler::_decode_instructions_virtual)((uintptr_t)start, (uintptr_t)end,
484 start, end - start,
485 &event_to_env, (void*) this,
486 &printf_to_env, (void*) this,
487 options(), 0/*nice new line*/)
488 :
489 (address)
490 (*Disassembler::_decode_instructions)(start, end,
491 &event_to_env, (void*) this,
492 &printf_to_env, (void*) this,
493 options());
494 }
495
496
497 void Disassembler::decode(CodeBlob* cb, outputStream* st) {
498 if (!load_library()) return;
499 decode_env env(cb, st);
500 env.output()->print_cr("Decoding CodeBlob " PTR_FORMAT, cb);
501 env.decode_instructions(cb->code_begin(), cb->code_end());
502 }
503
504 void Disassembler::decode(address start, address end, outputStream* st, CodeStrings c) {
505 if (!load_library()) return;
506 decode_env env(CodeCache::find_blob_unsafe(start), st, c);
507 env.decode_instructions(start, end);
508 }
509
510 void Disassembler::decode(nmethod* nm, outputStream* st) {
511 if (!load_library()) return;
512 decode_env env(nm, st);
513 env.output()->print_cr("Decoding compiled method " PTR_FORMAT ":", nm);
514 env.output()->print_cr("Code:");
515
516 #ifdef SHARK
517 SharkEntry* entry = (SharkEntry *) nm->code_begin();
518 unsigned char* p = entry->code_start();
519 unsigned char* end = entry->code_limit();
520 #else
521 unsigned char* p = nm->code_begin();
522 unsigned char* end = nm->code_end();
523 #endif // SHARK
524
525 // If there has been profiling, print the buckets.
526 if (FlatProfiler::bucket_start_for(p) != NULL) {
527 unsigned char* p1 = p;
528 int total_bucket_count = 0;
529 while (p1 < end) {
530 unsigned char* p0 = p1;
531 p1 += pd_instruction_alignment();
532 address bucket_pc = FlatProfiler::bucket_start_for(p1);
533 if (bucket_pc != NULL && bucket_pc > p0 && bucket_pc <= p1)
534 total_bucket_count += FlatProfiler::bucket_count_for(p0);
535 }
536 env.set_total_ticks(total_bucket_count);
537 }
538
539 // Print constant table.
540 if (nm->consts_size() > 0) {
541 nm->print_nmethod_labels(env.output(), nm->consts_begin());
542 int offset = 0;
543 for (address p = nm->consts_begin(); p < nm->consts_end(); p += 4, offset += 4) {
544 if ((offset % 8) == 0) {
545 env.output()->print_cr(" " PTR_FORMAT " (offset: %4d): " PTR32_FORMAT " " PTR64_FORMAT, p, offset, *((int32_t*) p), *((int64_t*) p));
546 } else {
547 env.output()->print_cr(" " PTR_FORMAT " (offset: %4d): " PTR32_FORMAT, p, offset, *((int32_t*) p));
548 }
549 }
550 }
551
552 env.decode_instructions(p, end);
553 }

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