1 /* 2 * Copyright (c) 1997, 2016, 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.inline.hpp" 27 #include "interpreter/bytecodeHistogram.hpp" 28 #include "interpreter/bytecodeTracer.hpp" 29 #include "interpreter/bytecodes.hpp" 30 #include "interpreter/interpreter.hpp" 31 #include "interpreter/interpreterRuntime.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "oops/methodData.hpp" 34 #include "oops/method.hpp" 35 #include "runtime/mutexLocker.hpp" 36 #include "runtime/timer.hpp" 37 #include "utilities/align.hpp" 38 39 40 // Standard closure for BytecodeTracer: prints the current bytecode 41 // and its attributes using bytecode-specific information. 42 43 class BytecodePrinter: public BytecodeClosure { 44 private: 45 // %%% This field is not GC-ed, and so can contain garbage 46 // between critical sections. Use only pointer-comparison 47 // operations on the pointer, except within a critical section. 48 // (Also, ensure that occasional false positives are benign.) 49 Method* _current_method; 50 bool _is_wide; 51 Bytecodes::Code _code; 52 address _next_pc; // current decoding position 53 54 void align() { _next_pc = align_up(_next_pc, sizeof(jint)); } 55 int get_byte() { return *(jbyte*) _next_pc++; } // signed 56 short get_short() { short i=Bytes::get_Java_u2(_next_pc); _next_pc+=2; return i; } 57 int get_int() { int i=Bytes::get_Java_u4(_next_pc); _next_pc+=4; return i; } 58 59 int get_index_u1() { return *(address)_next_pc++; } 60 int get_index_u2() { int i=Bytes::get_Java_u2(_next_pc); _next_pc+=2; return i; } 61 int get_index_u1_cpcache() { return get_index_u1() + ConstantPool::CPCACHE_INDEX_TAG; } 62 int get_index_u2_cpcache() { int i=Bytes::get_native_u2(_next_pc); _next_pc+=2; return i + ConstantPool::CPCACHE_INDEX_TAG; } 63 int get_index_u4() { int i=Bytes::get_native_u4(_next_pc); _next_pc+=4; return i; } 64 int get_index_special() { return (is_wide()) ? get_index_u2() : get_index_u1(); } 65 Method* method() { return _current_method; } 66 bool is_wide() { return _is_wide; } 67 Bytecodes::Code raw_code() { return Bytecodes::Code(_code); } 68 69 70 bool check_index(int i, int& cp_index, outputStream* st = tty); 71 bool check_cp_cache_index(int i, int& cp_index, outputStream* st = tty); 72 bool check_obj_index(int i, int& cp_index, outputStream* st = tty); 73 bool check_invokedynamic_index(int i, int& cp_index, outputStream* st = tty); 74 void print_constant(int i, outputStream* st = tty); 75 void print_field_or_method(int i, outputStream* st = tty); 76 void print_field_or_method(int orig_i, int i, outputStream* st = tty); 77 void print_attributes(int bci, outputStream* st = tty); 78 void bytecode_epilog(int bci, outputStream* st = tty); 79 80 public: 81 BytecodePrinter() { 82 _is_wide = false; 83 _code = Bytecodes::_illegal; 84 } 85 86 // This method is called while executing the raw bytecodes, so none of 87 // the adjustments that BytecodeStream performs applies. 88 void trace(const methodHandle& method, address bcp, uintptr_t tos, uintptr_t tos2, outputStream* st) { 89 ResourceMark rm; 90 if (_current_method != method()) { 91 // Note 1: This code will not work as expected with true MT/MP. 92 // Need an explicit lock or a different solution. 93 // It is possible for this block to be skipped, if a garbage 94 // _current_method pointer happens to have the same bits as 95 // the incoming method. We could lose a line of trace output. 96 // This is acceptable in a debug-only feature. 97 st->cr(); 98 st->print("[%ld] ", (long) Thread::current()->osthread()->thread_id()); 99 method->print_name(st); 100 st->cr(); 101 _current_method = method(); 102 } 103 Bytecodes::Code code; 104 if (is_wide()) { 105 // bcp wasn't advanced if previous bytecode was _wide. 106 code = Bytecodes::code_at(method(), bcp+1); 107 } else { 108 code = Bytecodes::code_at(method(), bcp); 109 } 110 _code = code; 111 int bci = bcp - method->code_base(); 112 st->print("[%ld] ", (long) Thread::current()->osthread()->thread_id()); 113 if (Verbose) { 114 st->print("%8d %4d " INTPTR_FORMAT " " INTPTR_FORMAT " %s", 115 BytecodeCounter::counter_value(), bci, tos, tos2, Bytecodes::name(code)); 116 } else { 117 st->print("%8d %4d %s", 118 BytecodeCounter::counter_value(), bci, Bytecodes::name(code)); 119 } 120 _next_pc = is_wide() ? bcp+2 : bcp+1; 121 print_attributes(bci); 122 // Set is_wide for the next one, since the caller of this doesn't skip 123 // the next bytecode. 124 _is_wide = (code == Bytecodes::_wide); 125 _code = Bytecodes::_illegal; 126 } 127 128 // Used for Method*::print_codes(). The input bcp comes from 129 // BytecodeStream, which will skip wide bytecodes. 130 void trace(const methodHandle& method, address bcp, outputStream* st) { 131 _current_method = method(); 132 ResourceMark rm; 133 Bytecodes::Code code = Bytecodes::code_at(method(), bcp); 134 // Set is_wide 135 _is_wide = (code == Bytecodes::_wide); 136 if (is_wide()) { 137 code = Bytecodes::code_at(method(), bcp+1); 138 } 139 _code = code; 140 int bci = bcp - method->code_base(); 141 // Print bytecode index and name 142 if (is_wide()) { 143 st->print("%d %s_w", bci, Bytecodes::name(code)); 144 } else { 145 st->print("%d %s", bci, Bytecodes::name(code)); 146 } 147 _next_pc = is_wide() ? bcp+2 : bcp+1; 148 print_attributes(bci, st); 149 bytecode_epilog(bci, st); 150 } 151 }; 152 153 154 // Implementation of BytecodeTracer 155 156 // %%% This set_closure thing seems overly general, given that 157 // nobody uses it. Also, if BytecodePrinter weren't hidden 158 // then Method* could use instances of it directly and it 159 // would be easier to remove races on _current_method and bcp. 160 // Since this is not product functionality, we can defer cleanup. 161 162 BytecodeClosure* BytecodeTracer::_closure = NULL; 163 164 static BytecodePrinter std_closure; 165 BytecodeClosure* BytecodeTracer::std_closure() { 166 return &::std_closure; 167 } 168 169 170 void BytecodeTracer::trace(const methodHandle& method, address bcp, uintptr_t tos, uintptr_t tos2, outputStream* st) { 171 if (TraceBytecodes && BytecodeCounter::counter_value() >= TraceBytecodesAt) { 172 ttyLocker ttyl; // 5065316: keep the following output coherent 173 // The ttyLocker also prevents races between two threads 174 // trying to use the single instance of BytecodePrinter. 175 // Using the ttyLocker prevents the system from coming to 176 // a safepoint within this code, which is sensitive to Method* 177 // movement. 178 // 179 // There used to be a leaf mutex here, but the ttyLocker will 180 // work just as well, as long as the printing operations never block. 181 // 182 // We put the locker on the static trace method, not the 183 // virtual one, because the clients of this module go through 184 // the static method. 185 _closure->trace(method, bcp, tos, tos2, st); 186 } 187 } 188 189 void BytecodeTracer::trace(const methodHandle& method, address bcp, outputStream* st) { 190 ttyLocker ttyl; // 5065316: keep the following output coherent 191 _closure->trace(method, bcp, st); 192 } 193 194 void print_symbol(Symbol* sym, outputStream* st) { 195 char buf[40]; 196 int len = sym->utf8_length(); 197 if (len >= (int)sizeof(buf)) { 198 st->print_cr(" %s...[%d]", sym->as_C_string(buf, sizeof(buf)), len); 199 } else { 200 st->print(" "); 201 sym->print_on(st); st->cr(); 202 } 203 } 204 205 void print_oop(oop value, outputStream* st) { 206 if (value == NULL) { 207 st->print_cr(" NULL"); 208 } else if (java_lang_String::is_instance(value)) { 209 char buf[40]; 210 int len = java_lang_String::utf8_length(value); 211 java_lang_String::as_utf8_string(value, buf, sizeof(buf)); 212 if (len >= (int)sizeof(buf)) { 213 st->print_cr(" %s...[%d]", buf, len); 214 } else { 215 st->print_cr(" %s", buf); 216 } 217 } else { 218 st->print_cr(" " INTPTR_FORMAT, p2i((void *)value)); 219 } 220 } 221 222 bool BytecodePrinter::check_index(int i, int& cp_index, outputStream* st) { 223 ConstantPool* constants = method()->constants(); 224 int ilimit = constants->length(); 225 Bytecodes::Code code = raw_code(); 226 227 ConstantPoolCache* cache = NULL; 228 if (Bytecodes::uses_cp_cache(code)) { 229 bool okay = true; 230 switch (code) { 231 case Bytecodes::_fast_aldc: 232 case Bytecodes::_fast_aldc_w: 233 okay = check_obj_index(i, cp_index, st); 234 break; 235 case Bytecodes::_invokedynamic: 236 okay = check_invokedynamic_index(i, cp_index, st); 237 break; 238 default: 239 okay = check_cp_cache_index(i, cp_index, st); 240 break; 241 } 242 if (!okay) return false; 243 } 244 245 246 // check cp index 247 if (cp_index >= 0 && cp_index < ilimit) { 248 if (WizardMode) st->print(" cp[%d]", cp_index); 249 return true; 250 } 251 252 st->print_cr(" CP[%d] not in CP", cp_index); 253 return false; 254 } 255 256 bool BytecodePrinter::check_cp_cache_index(int i, int& cp_index, outputStream* st) { 257 ConstantPool* constants = method()->constants(); 258 int ilimit = constants->length(), climit = 0; 259 Bytecodes::Code code = raw_code(); 260 261 ConstantPoolCache* cache = constants->cache(); 262 // If rewriter hasn't run, the index is the cp_index 263 if (cache == NULL) { 264 cp_index = i; 265 return true; 266 } 267 //climit = cache->length(); // %%% private! 268 size_t size = cache->size() * wordSize; 269 size -= sizeof(ConstantPoolCache); 270 size /= sizeof(ConstantPoolCacheEntry); 271 climit = (int) size; 272 273 #ifdef ASSERT 274 { 275 const int CPCACHE_INDEX_TAG = ConstantPool::CPCACHE_INDEX_TAG; 276 if (i >= CPCACHE_INDEX_TAG && i < climit + CPCACHE_INDEX_TAG) { 277 i -= CPCACHE_INDEX_TAG; 278 } else { 279 st->print_cr(" CP[%d] missing bias?", i); 280 return false; 281 } 282 } 283 #endif //ASSERT 284 if (i >= 0 && i < climit) { 285 cp_index = cache->entry_at(i)->constant_pool_index(); 286 } else { 287 st->print_cr("%d not in CP[*]?", i); 288 return false; 289 } 290 return true; 291 } 292 293 294 bool BytecodePrinter::check_obj_index(int i, int& cp_index, outputStream* st) { 295 ConstantPool* constants = method()->constants(); 296 i -= ConstantPool::CPCACHE_INDEX_TAG; 297 298 if (i >= 0 && i < constants->resolved_references()->length()) { 299 cp_index = constants->object_to_cp_index(i); 300 return true; 301 } else { 302 st->print_cr("%d not in OBJ[*]?", i); 303 return false; 304 } 305 } 306 307 308 bool BytecodePrinter::check_invokedynamic_index(int i, int& cp_index, outputStream* st) { 309 ConstantPool* constants = method()->constants(); 310 assert(ConstantPool::is_invokedynamic_index(i), "not secondary index?"); 311 i = ConstantPool::decode_invokedynamic_index(i) + ConstantPool::CPCACHE_INDEX_TAG; 312 313 return check_cp_cache_index(i, cp_index, st); 314 } 315 316 void BytecodePrinter::print_constant(int i, outputStream* st) { 317 int orig_i = i; 318 if (!check_index(orig_i, i, st)) return; 319 320 ConstantPool* constants = method()->constants(); 321 constantTag tag = constants->tag_at(i); 322 323 if (tag.is_int()) { 324 st->print_cr(" " INT32_FORMAT, constants->int_at(i)); 325 } else if (tag.is_long()) { 326 st->print_cr(" " INT64_FORMAT, (int64_t)(constants->long_at(i))); 327 } else if (tag.is_float()) { 328 st->print_cr(" %f", constants->float_at(i)); 329 } else if (tag.is_double()) { 330 st->print_cr(" %f", constants->double_at(i)); 331 } else if (tag.is_string()) { 332 const char* string = constants->string_at_noresolve(i); 333 st->print_cr(" %s", string); 334 } else if (tag.is_klass()) { 335 st->print_cr(" %s", constants->resolved_klass_at(i)->external_name()); 336 } else if (tag.is_unresolved_klass()) { 337 st->print_cr(" <unresolved klass at %d>", i); 338 } else if (tag.is_method_type()) { 339 int i2 = constants->method_type_index_at(i); 340 st->print(" <MethodType> %d", i2); 341 print_symbol(constants->symbol_at(i2), st); 342 } else if (tag.is_method_handle()) { 343 int kind = constants->method_handle_ref_kind_at(i); 344 int i2 = constants->method_handle_index_at(i); 345 st->print(" <MethodHandle of kind %d index at %d>", kind, i2); 346 print_field_or_method(-i, i2, st); 347 } else { 348 st->print_cr(" bad tag=%d at %d", tag.value(), i); 349 } 350 } 351 352 void BytecodePrinter::print_field_or_method(int i, outputStream* st) { 353 int orig_i = i; 354 if (!check_index(orig_i, i, st)) return; 355 print_field_or_method(orig_i, i, st); 356 } 357 358 void BytecodePrinter::print_field_or_method(int orig_i, int i, outputStream* st) { 359 ConstantPool* constants = method()->constants(); 360 constantTag tag = constants->tag_at(i); 361 362 bool has_klass = true; 363 364 switch (tag.value()) { 365 case JVM_CONSTANT_InterfaceMethodref: 366 case JVM_CONSTANT_Methodref: 367 case JVM_CONSTANT_Fieldref: 368 break; 369 case JVM_CONSTANT_NameAndType: 370 case JVM_CONSTANT_InvokeDynamic: 371 has_klass = false; 372 break; 373 default: 374 st->print_cr(" bad tag=%d at %d", tag.value(), i); 375 return; 376 } 377 378 Symbol* name = constants->uncached_name_ref_at(i); 379 Symbol* signature = constants->uncached_signature_ref_at(i); 380 const char* sep = (tag.is_field() ? "/" : ""); 381 if (has_klass) { 382 Symbol* klass = constants->klass_name_at(constants->uncached_klass_ref_index_at(i)); 383 st->print_cr(" %d <%s.%s%s%s> ", i, klass->as_C_string(), name->as_C_string(), sep, signature->as_C_string()); 384 } else { 385 if (tag.is_invoke_dynamic()) { 386 int bsm = constants->invoke_dynamic_bootstrap_method_ref_index_at(i); 387 st->print(" bsm=%d", bsm); 388 } 389 st->print_cr(" %d <%s%s%s>", i, name->as_C_string(), sep, signature->as_C_string()); 390 } 391 } 392 393 394 void BytecodePrinter::print_attributes(int bci, outputStream* st) { 395 // Show attributes of pre-rewritten codes 396 Bytecodes::Code code = Bytecodes::java_code(raw_code()); 397 // If the code doesn't have any fields there's nothing to print. 398 // note this is ==1 because the tableswitch and lookupswitch are 399 // zero size (for some reason) and we want to print stuff out for them. 400 if (Bytecodes::length_for(code) == 1) { 401 st->cr(); 402 return; 403 } 404 405 switch(code) { 406 // Java specific bytecodes only matter. 407 case Bytecodes::_bipush: 408 st->print_cr(" " INT32_FORMAT, get_byte()); 409 break; 410 case Bytecodes::_sipush: 411 st->print_cr(" " INT32_FORMAT, get_short()); 412 break; 413 case Bytecodes::_ldc: 414 if (Bytecodes::uses_cp_cache(raw_code())) { 415 print_constant(get_index_u1_cpcache(), st); 416 } else { 417 print_constant(get_index_u1(), st); 418 } 419 break; 420 421 case Bytecodes::_ldc_w: 422 case Bytecodes::_ldc2_w: 423 if (Bytecodes::uses_cp_cache(raw_code())) { 424 print_constant(get_index_u2_cpcache(), st); 425 } else { 426 print_constant(get_index_u2(), st); 427 } 428 break; 429 430 case Bytecodes::_iload: 431 case Bytecodes::_lload: 432 case Bytecodes::_fload: 433 case Bytecodes::_dload: 434 case Bytecodes::_aload: 435 case Bytecodes::_istore: 436 case Bytecodes::_lstore: 437 case Bytecodes::_fstore: 438 case Bytecodes::_dstore: 439 case Bytecodes::_astore: 440 st->print_cr(" #%d", get_index_special()); 441 break; 442 443 case Bytecodes::_iinc: 444 { int index = get_index_special(); 445 jint offset = is_wide() ? get_short(): get_byte(); 446 st->print_cr(" #%d " INT32_FORMAT, index, offset); 447 } 448 break; 449 450 case Bytecodes::_newarray: { 451 BasicType atype = (BasicType)get_index_u1(); 452 const char* str = type2name(atype); 453 if (str == NULL || atype == T_OBJECT || atype == T_ARRAY) { 454 assert(false, "Unidentified basic type"); 455 } 456 st->print_cr(" %s", str); 457 } 458 break; 459 case Bytecodes::_anewarray: { 460 int klass_index = get_index_u2(); 461 ConstantPool* constants = method()->constants(); 462 Symbol* name = constants->klass_name_at(klass_index); 463 st->print_cr(" %s ", name->as_C_string()); 464 } 465 break; 466 case Bytecodes::_multianewarray: { 467 int klass_index = get_index_u2(); 468 int nof_dims = get_index_u1(); 469 ConstantPool* constants = method()->constants(); 470 Symbol* name = constants->klass_name_at(klass_index); 471 st->print_cr(" %s %d", name->as_C_string(), nof_dims); 472 } 473 break; 474 475 case Bytecodes::_ifeq: 476 case Bytecodes::_ifnull: 477 case Bytecodes::_iflt: 478 case Bytecodes::_ifle: 479 case Bytecodes::_ifne: 480 case Bytecodes::_ifnonnull: 481 case Bytecodes::_ifgt: 482 case Bytecodes::_ifge: 483 case Bytecodes::_if_icmpeq: 484 case Bytecodes::_if_icmpne: 485 case Bytecodes::_if_icmplt: 486 case Bytecodes::_if_icmpgt: 487 case Bytecodes::_if_icmple: 488 case Bytecodes::_if_icmpge: 489 case Bytecodes::_if_acmpeq: 490 case Bytecodes::_if_acmpne: 491 case Bytecodes::_goto: 492 case Bytecodes::_jsr: 493 st->print_cr(" %d", bci + get_short()); 494 break; 495 496 case Bytecodes::_goto_w: 497 case Bytecodes::_jsr_w: 498 st->print_cr(" %d", bci + get_int()); 499 break; 500 501 case Bytecodes::_ret: st->print_cr(" %d", get_index_special()); break; 502 503 case Bytecodes::_tableswitch: 504 { align(); 505 int default_dest = bci + get_int(); 506 int lo = get_int(); 507 int hi = get_int(); 508 int len = hi - lo + 1; 509 jint* dest = NEW_RESOURCE_ARRAY(jint, len); 510 for (int i = 0; i < len; i++) { 511 dest[i] = bci + get_int(); 512 } 513 st->print(" %d " INT32_FORMAT " " INT32_FORMAT " ", 514 default_dest, lo, hi); 515 const char *comma = ""; 516 for (int ll = lo; ll <= hi; ll++) { 517 int idx = ll - lo; 518 st->print("%s %d:" INT32_FORMAT " (delta: %d)", comma, ll, dest[idx], dest[idx]-bci); 519 comma = ","; 520 } 521 st->cr(); 522 } 523 break; 524 case Bytecodes::_lookupswitch: 525 { align(); 526 int default_dest = bci + get_int(); 527 int len = get_int(); 528 jint* key = NEW_RESOURCE_ARRAY(jint, len); 529 jint* dest = NEW_RESOURCE_ARRAY(jint, len); 530 for (int i = 0; i < len; i++) { 531 key [i] = get_int(); 532 dest[i] = bci + get_int(); 533 }; 534 st->print(" %d %d ", default_dest, len); 535 const char *comma = ""; 536 for (int ll = 0; ll < len; ll++) { 537 st->print("%s " INT32_FORMAT ":" INT32_FORMAT, comma, key[ll], dest[ll]); 538 comma = ","; 539 } 540 st->cr(); 541 } 542 break; 543 544 case Bytecodes::_putstatic: 545 case Bytecodes::_getstatic: 546 case Bytecodes::_putfield: 547 case Bytecodes::_getfield: 548 print_field_or_method(get_index_u2_cpcache(), st); 549 break; 550 551 case Bytecodes::_invokevirtual: 552 case Bytecodes::_invokespecial: 553 case Bytecodes::_invokestatic: 554 print_field_or_method(get_index_u2_cpcache(), st); 555 break; 556 557 case Bytecodes::_invokeinterface: 558 { int i = get_index_u2_cpcache(); 559 int n = get_index_u1(); 560 get_byte(); // ignore zero byte 561 print_field_or_method(i, st); 562 } 563 break; 564 565 case Bytecodes::_invokedynamic: 566 print_field_or_method(get_index_u4(), st); 567 break; 568 569 case Bytecodes::_new: 570 case Bytecodes::_checkcast: 571 case Bytecodes::_instanceof: 572 { int i = get_index_u2(); 573 ConstantPool* constants = method()->constants(); 574 Symbol* name = constants->klass_name_at(i); 575 st->print_cr(" %d <%s>", i, name->as_C_string()); 576 } 577 break; 578 579 case Bytecodes::_wide: 580 // length is zero not one, but printed with no more info. 581 break; 582 583 default: 584 ShouldNotReachHere(); 585 break; 586 } 587 } 588 589 590 void BytecodePrinter::bytecode_epilog(int bci, outputStream* st) { 591 MethodData* mdo = method()->method_data(); 592 if (mdo != NULL) { 593 ProfileData* data = mdo->bci_to_data(bci); 594 if (data != NULL) { 595 st->print(" %d", mdo->dp_to_di(data->dp())); 596 st->fill_to(6); 597 data->print_data_on(st, mdo); 598 } 599 } 600 }