1 /*
2 * Copyright (c) 2008, 2010, 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 "incls/_precompiled.incl"
26 # include "incls/_disassembler.cpp.incl"
27
28 void* Disassembler::_library = NULL;
29 bool Disassembler::_tried_to_load_library = false;
30
31 // This routine is in the shared library:
32 Disassembler::decode_func Disassembler::_decode_instructions = NULL;
33
34 static const char hsdis_library_name[] = "hsdis-"HOTSPOT_LIB_ARCH;
35 static const char decode_instructions_name[] = "decode_instructions";
36
37 #define COMMENT_COLUMN 40 LP64_ONLY(+8) /*could be an option*/
38 #define BYTES_COMMENT ";..." /* funky byte display comment */
39
40 bool Disassembler::load_library() {
41 if (_decode_instructions != NULL) {
42 // Already succeeded.
43 return true;
44 }
45 if (_tried_to_load_library) {
46 // Do not try twice.
47 // To force retry in debugger: assign _tried_to_load_library=0
48 return false;
49 }
50 // Try to load it.
51 char ebuf[1024];
52 char buf[JVM_MAXPATHLEN];
53 os::jvm_path(buf, sizeof(buf));
54 int jvm_offset = -1;
55 {
56 // Match "jvm[^/]*" in jvm_path.
57 const char* base = buf;
58 const char* p = strrchr(buf, '/');
59 p = strstr(p ? p : base, "jvm");
60 if (p != NULL) jvm_offset = p - base;
61 }
62 if (jvm_offset >= 0) {
63 // Find the disassembler next to libjvm.so.
64 strcpy(&buf[jvm_offset], hsdis_library_name);
65 strcat(&buf[jvm_offset], os::dll_file_extension());
66 _library = hpi::dll_load(buf, ebuf, sizeof ebuf);
67 }
68 if (_library == NULL) {
69 // Try a free-floating lookup.
70 strcpy(&buf[0], hsdis_library_name);
71 strcat(&buf[0], os::dll_file_extension());
72 _library = hpi::dll_load(buf, ebuf, sizeof ebuf);
73 }
74 if (_library != NULL) {
75 _decode_instructions = CAST_TO_FN_PTR(Disassembler::decode_func,
76 hpi::dll_lookup(_library, decode_instructions_name));
77 }
78 _tried_to_load_library = true;
79 if (_decode_instructions == NULL) {
80 tty->print_cr("Could not load %s; %s; %s", buf,
81 ((_library != NULL)
82 ? "entry point is missing"
83 : (WizardMode || PrintMiscellaneous)
84 ? (const char*)ebuf
85 : "library not loadable"),
86 "PrintAssembly is disabled");
87 return false;
88 }
89
90 // Success.
91 tty->print_cr("Loaded disassembler from %s", buf);
92 return true;
93 }
94
95
96 class decode_env {
97 private:
98 nmethod* _nm;
99 CodeBlob* _code;
100 outputStream* _output;
101 address _start, _end;
102
103 char _option_buf[512];
104 char _print_raw;
105 bool _print_pc;
106 bool _print_bytes;
107 address _cur_insn;
108 int _total_ticks;
109 int _bytes_per_line; // arch-specific formatting option
110
111 static bool match(const char* event, const char* tag) {
112 size_t taglen = strlen(tag);
113 if (strncmp(event, tag, taglen) != 0)
114 return false;
115 char delim = event[taglen];
116 return delim == '\0' || delim == ' ' || delim == '/' || delim == '=';
117 }
118
119 void collect_options(const char* p) {
120 if (p == NULL || p[0] == '\0') return;
121 size_t opt_so_far = strlen(_option_buf);
122 if (opt_so_far + 1 + strlen(p) + 1 > sizeof(_option_buf)) return;
123 char* fillp = &_option_buf[opt_so_far];
124 if (opt_so_far > 0) *fillp++ = ',';
125 strcat(fillp, p);
126 // replace white space by commas:
127 char* q = fillp;
128 while ((q = strpbrk(q, " \t\n")) != NULL)
129 *q++ = ',';
130 // Note that multiple PrintAssemblyOptions flags accumulate with \n,
131 // which we want to be changed to a comma...
132 }
133
134 void print_insn_labels();
135 void print_insn_bytes(address pc0, address pc);
136 void print_address(address value);
137
138 public:
139 decode_env(CodeBlob* code, outputStream* output);
140
141 address decode_instructions(address start, address end);
142
143 void start_insn(address pc) {
144 _cur_insn = pc;
145 output()->bol();
146 print_insn_labels();
147 }
148
149 void end_insn(address pc) {
150 address pc0 = cur_insn();
151 outputStream* st = output();
152 if (_print_bytes && pc > pc0)
153 print_insn_bytes(pc0, pc);
154 if (_nm != NULL) {
155 _nm->print_code_comment_on(st, COMMENT_COLUMN, pc0, pc);
156 // this calls reloc_string_for which calls oop::print_value_on
157 }
158
159 // Output pc bucket ticks if we have any
160 if (total_ticks() != 0) {
161 address bucket_pc = FlatProfiler::bucket_start_for(pc);
162 if (bucket_pc != NULL && bucket_pc > pc0 && bucket_pc <= pc) {
163 int bucket_count = FlatProfiler::bucket_count_for(pc0);
164 if (bucket_count != 0) {
165 st->bol();
166 st->print_cr("%3.1f%% [%d]", bucket_count*100.0/total_ticks(), bucket_count);
167 }
168 }
169 }
170 }
171
172 address handle_event(const char* event, address arg);
173
174 outputStream* output() { return _output; }
175 address cur_insn() { return _cur_insn; }
176 int total_ticks() { return _total_ticks; }
177 void set_total_ticks(int n) { _total_ticks = n; }
178 const char* options() { return _option_buf; }
179 };
180
181 decode_env::decode_env(CodeBlob* code, outputStream* output) {
182 memset(this, 0, sizeof(*this));
183 _output = output ? output : tty;
184 _code = code;
185 if (code != NULL && code->is_nmethod())
186 _nm = (nmethod*) code;
187
188 // by default, output pc but not bytes:
189 _print_pc = true;
190 _print_bytes = false;
191 _bytes_per_line = Disassembler::pd_instruction_alignment();
192
193 // parse the global option string:
194 collect_options(Disassembler::pd_cpu_opts());
195 collect_options(PrintAssemblyOptions);
196
197 if (strstr(options(), "hsdis-")) {
198 if (strstr(options(), "hsdis-print-raw"))
199 _print_raw = (strstr(options(), "xml") ? 2 : 1);
200 if (strstr(options(), "hsdis-print-pc"))
201 _print_pc = !_print_pc;
202 if (strstr(options(), "hsdis-print-bytes"))
203 _print_bytes = !_print_bytes;
204 }
205 if (strstr(options(), "help")) {
206 tty->print_cr("PrintAssemblyOptions help:");
207 tty->print_cr(" hsdis-print-raw test plugin by requesting raw output");
208 tty->print_cr(" hsdis-print-raw-xml test plugin by requesting raw xml");
209 tty->print_cr(" hsdis-print-pc turn off PC printing (on by default)");
210 tty->print_cr(" hsdis-print-bytes turn on instruction byte output");
211 tty->print_cr("combined options: %s", options());
212 }
213 }
214
215 address decode_env::handle_event(const char* event, address arg) {
216 if (match(event, "insn")) {
217 start_insn(arg);
218 } else if (match(event, "/insn")) {
219 end_insn(arg);
220 } else if (match(event, "addr")) {
221 if (arg != NULL) {
222 print_address(arg);
223 return arg;
224 }
225 } else if (match(event, "mach")) {
226 output()->print_cr("[Disassembling for mach='%s']", arg);
227 } else if (match(event, "format bytes-per-line")) {
228 _bytes_per_line = (int) (intptr_t) arg;
229 } else {
230 // ignore unrecognized markup
231 }
232 return NULL;
233 }
234
235 // called by the disassembler to print out jump targets and data addresses
236 void decode_env::print_address(address adr) {
237 outputStream* st = _output;
238
239 if (adr == NULL) {
240 st->print("NULL");
241 return;
242 }
243
244 int small_num = (int)(intptr_t)adr;
245 if ((intptr_t)adr == (intptr_t)small_num
246 && -1 <= small_num && small_num <= 9) {
247 st->print("%d", small_num);
248 return;
249 }
250
251 if (Universe::is_fully_initialized()) {
252 if (StubRoutines::contains(adr)) {
253 StubCodeDesc* desc = StubCodeDesc::desc_for(adr);
254 if (desc == NULL)
255 desc = StubCodeDesc::desc_for(adr + frame::pc_return_offset);
256 if (desc != NULL) {
257 st->print("Stub::%s", desc->name());
258 if (desc->begin() != adr)
259 st->print("%+d 0x%p",adr - desc->begin(), adr);
260 else if (WizardMode) st->print(" " INTPTR_FORMAT, adr);
261 return;
262 }
263 st->print("Stub::<unknown> " INTPTR_FORMAT, adr);
264 return;
265 }
266
267 BarrierSet* bs = Universe::heap()->barrier_set();
268 if (bs->kind() == BarrierSet::CardTableModRef &&
269 adr == (address)((CardTableModRefBS*)(bs))->byte_map_base) {
270 st->print("word_map_base");
271 if (WizardMode) st->print(" " INTPTR_FORMAT, (intptr_t)adr);
272 return;
273 }
274
275 oop obj;
276 if (_nm != NULL
277 && (obj = _nm->embeddedOop_at(cur_insn())) != NULL
278 && (address) obj == adr
279 && Universe::heap()->is_in(obj)
280 && Universe::heap()->is_in(obj->klass())) {
281 julong c = st->count();
282 obj->print_value_on(st);
283 if (st->count() == c) {
284 // No output. (Can happen in product builds.)
285 st->print("(a %s)", Klass::cast(obj->klass())->external_name());
286 }
287 return;
288 }
289 }
290
291 // Fall through to a simple numeral.
292 st->print(INTPTR_FORMAT, (intptr_t)adr);
293 }
294
295 void decode_env::print_insn_labels() {
296 address p = cur_insn();
297 outputStream* st = output();
298 CodeBlob* cb = _code;
299 if (cb != NULL) {
300 cb->print_block_comment(st, p);
301 }
302 if (_print_pc) {
303 st->print(" " INTPTR_FORMAT ": ", (intptr_t) p);
304 }
305 }
306
307 void decode_env::print_insn_bytes(address pc, address pc_limit) {
308 outputStream* st = output();
309 size_t incr = 1;
310 size_t perline = _bytes_per_line;
311 if ((size_t) Disassembler::pd_instruction_alignment() >= sizeof(int)
312 && !((uintptr_t)pc % sizeof(int))
313 && !((uintptr_t)pc_limit % sizeof(int))) {
314 incr = sizeof(int);
315 if (perline % incr) perline += incr - (perline % incr);
316 }
317 while (pc < pc_limit) {
318 // tab to the desired column:
319 st->move_to(COMMENT_COLUMN);
320 address pc0 = pc;
321 address pc1 = pc + perline;
322 if (pc1 > pc_limit) pc1 = pc_limit;
323 for (; pc < pc1; pc += incr) {
324 if (pc == pc0)
325 st->print(BYTES_COMMENT);
326 else if ((uint)(pc - pc0) % sizeof(int) == 0)
327 st->print(" "); // put out a space on word boundaries
328 if (incr == sizeof(int))
329 st->print("%08lx", *(int*)pc);
330 else st->print("%02x", (*pc)&0xFF);
331 }
332 st->cr();
333 }
334 }
335
336
337 static void* event_to_env(void* env_pv, const char* event, void* arg) {
338 decode_env* env = (decode_env*) env_pv;
339 return env->handle_event(event, (address) arg);
340 }
341
342 static int printf_to_env(void* env_pv, const char* format, ...) {
343 decode_env* env = (decode_env*) env_pv;
344 outputStream* st = env->output();
345 size_t flen = strlen(format);
346 const char* raw = NULL;
347 if (flen == 0) return 0;
348 if (flen == 1 && format[0] == '\n') { st->bol(); return 1; }
349 if (flen < 2 ||
350 strchr(format, '%') == NULL) {
351 raw = format;
352 } else if (format[0] == '%' && format[1] == '%' &&
353 strchr(format+2, '%') == NULL) {
354 // happens a lot on machines with names like %foo
355 flen--;
356 raw = format+1;
357 }
358 if (raw != NULL) {
359 st->print_raw(raw, (int) flen);
360 return (int) flen;
361 }
362 va_list ap;
363 va_start(ap, format);
364 julong cnt0 = st->count();
365 st->vprint(format, ap);
366 julong cnt1 = st->count();
367 va_end(ap);
368 return (int)(cnt1 - cnt0);
369 }
370
371 address decode_env::decode_instructions(address start, address end) {
372 _start = start; _end = end;
373
374 assert(((((intptr_t)start | (intptr_t)end) % Disassembler::pd_instruction_alignment()) == 0), "misaligned insn addr");
375
376 const int show_bytes = false; // for disassembler debugging
377
378 //_version = Disassembler::pd_cpu_version();
379
380 if (!Disassembler::can_decode()) {
381 return NULL;
382 }
383
384 // decode a series of instructions and return the end of the last instruction
385
386 if (_print_raw) {
387 // Print whatever the library wants to print, w/o fancy callbacks.
388 // This is mainly for debugging the library itself.
389 FILE* out = stdout;
390 FILE* xmlout = (_print_raw > 1 ? out : NULL);
391 return (address)
392 (*Disassembler::_decode_instructions)(start, end,
393 NULL, (void*) xmlout,
394 NULL, (void*) out,
395 options());
396 }
397
398 return (address)
399 (*Disassembler::_decode_instructions)(start, end,
400 &event_to_env, (void*) this,
401 &printf_to_env, (void*) this,
402 options());
403 }
404
405
406 void Disassembler::decode(CodeBlob* cb, outputStream* st) {
407 if (!load_library()) return;
408 decode_env env(cb, st);
409 env.output()->print_cr("Decoding CodeBlob " INTPTR_FORMAT, cb);
410 env.decode_instructions(cb->code_begin(), cb->code_end());
411 }
412
413
414 void Disassembler::decode(address start, address end, outputStream* st) {
415 if (!load_library()) return;
416 decode_env env(CodeCache::find_blob_unsafe(start), st);
417 env.decode_instructions(start, end);
418 }
419
420 void Disassembler::decode(nmethod* nm, outputStream* st) {
421 if (!load_library()) return;
422 decode_env env(nm, st);
423 env.output()->print_cr("Decoding compiled method " INTPTR_FORMAT ":", nm);
424 env.output()->print_cr("Code:");
425
426 #ifdef SHARK
427 SharkEntry* entry = (SharkEntry *) nm->code_begin();
428 unsigned char* p = entry->code_start();
429 unsigned char* end = entry->code_limit();
430 #else
431 unsigned char* p = nm->code_begin();
432 unsigned char* end = nm->code_end();
433 #endif // SHARK
434
435 // If there has been profiling, print the buckets.
436 if (FlatProfiler::bucket_start_for(p) != NULL) {
437 unsigned char* p1 = p;
438 int total_bucket_count = 0;
439 while (p1 < end) {
440 unsigned char* p0 = p1;
441 p1 += pd_instruction_alignment();
442 address bucket_pc = FlatProfiler::bucket_start_for(p1);
443 if (bucket_pc != NULL && bucket_pc > p0 && bucket_pc <= p1)
444 total_bucket_count += FlatProfiler::bucket_count_for(p0);
445 }
446 env.set_total_ticks(total_bucket_count);
447 }
448
449 env.decode_instructions(p, end);
450 }