liveobjectlist.cc 80.8 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifdef LIVE_OBJECT_LIST

#include <ctype.h>
#include <stdlib.h>

#include "v8.h"

#include "checks.h"
#include "global-handles.h"
#include "heap.h"
#include "inspector.h"
#include "list-inl.h"
40
#include "liveobjectlist-inl.h"
41 42 43 44 45 46 47 48
#include "string-stream.h"
#include "top.h"
#include "v8utils.h"

namespace v8 {
namespace internal {


49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120
typedef int (*RawComparer)(const void*, const void*);


#ifdef CHECK_ALL_OBJECT_TYPES

#define DEBUG_LIVE_OBJECT_TYPES(v) \
  v(Smi, "unexpected: Smi") \
  \
  v(CodeCache, "unexpected: CodeCache") \
  v(BreakPointInfo, "unexpected: BreakPointInfo") \
  v(DebugInfo, "unexpected: DebugInfo") \
  v(TypeSwitchInfo, "unexpected: TypeSwitchInfo") \
  v(SignatureInfo, "unexpected: SignatureInfo") \
  v(Script, "unexpected: Script") \
  v(ObjectTemplateInfo, "unexpected: ObjectTemplateInfo") \
  v(FunctionTemplateInfo, "unexpected: FunctionTemplateInfo") \
  v(CallHandlerInfo, "unexpected: CallHandlerInfo") \
  v(InterceptorInfo, "unexpected: InterceptorInfo") \
  v(AccessCheckInfo, "unexpected: AccessCheckInfo") \
  v(AccessorInfo, "unexpected: AccessorInfo") \
  v(ExternalTwoByteString, "unexpected: ExternalTwoByteString") \
  v(ExternalAsciiString, "unexpected: ExternalAsciiString") \
  v(ExternalString, "unexpected: ExternalString") \
  v(SeqTwoByteString, "unexpected: SeqTwoByteString") \
  v(SeqAsciiString, "unexpected: SeqAsciiString") \
  v(SeqString, "unexpected: SeqString") \
  v(JSFunctionResultCache, "unexpected: JSFunctionResultCache") \
  v(GlobalContext, "unexpected: GlobalContext") \
  v(MapCache, "unexpected: MapCache") \
  v(CodeCacheHashTable, "unexpected: CodeCacheHashTable") \
  v(CompilationCacheTable, "unexpected: CompilationCacheTable") \
  v(SymbolTable, "unexpected: SymbolTable") \
  v(Dictionary, "unexpected: Dictionary") \
  v(HashTable, "unexpected: HashTable") \
  v(DescriptorArray, "unexpected: DescriptorArray") \
  v(ExternalFloatArray, "unexpected: ExternalFloatArray") \
  v(ExternalUnsignedIntArray, "unexpected: ExternalUnsignedIntArray") \
  v(ExternalIntArray, "unexpected: ExternalIntArray") \
  v(ExternalUnsignedShortArray, "unexpected: ExternalUnsignedShortArray") \
  v(ExternalShortArray, "unexpected: ExternalShortArray") \
  v(ExternalUnsignedByteArray, "unexpected: ExternalUnsignedByteArray") \
  v(ExternalByteArray, "unexpected: ExternalByteArray") \
  v(JSValue, "unexpected: JSValue")

#else
#define DEBUG_LIVE_OBJECT_TYPES(v)
#endif


#define FOR_EACH_LIVE_OBJECT_TYPE(v) \
  DEBUG_LIVE_OBJECT_TYPES(v) \
  \
  v(JSArray, "JSArray") \
  v(JSRegExp, "JSRegExp") \
  v(JSFunction, "JSFunction") \
  v(JSGlobalObject, "JSGlobal") \
  v(JSBuiltinsObject, "JSBuiltins") \
  v(GlobalObject, "Global") \
  v(JSGlobalProxy, "JSGlobalProxy") \
  v(JSObject, "JSObject") \
  \
  v(Context, "meta: Context") \
  v(ByteArray, "meta: ByteArray") \
  v(PixelArray, "meta: PixelArray") \
  v(ExternalArray, "meta: ExternalArray") \
  v(FixedArray, "meta: FixedArray") \
  v(String, "String") \
  v(HeapNumber, "HeapNumber") \
  \
  v(Code, "meta: Code") \
  v(Map, "meta: Map") \
  v(Oddball, "Oddball") \
121
  v(Foreign, "meta: Foreign") \
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594
  v(SharedFunctionInfo, "meta: SharedFunctionInfo") \
  v(Struct, "meta: Struct") \
  \
  v(HeapObject, "HeapObject")


enum /* LiveObjectType */ {
#define DECLARE_OBJECT_TYPE_ENUM(type, name) kType##type,
  FOR_EACH_LIVE_OBJECT_TYPE(DECLARE_OBJECT_TYPE_ENUM)
  kInvalidLiveObjType,
  kNumberOfTypes
#undef DECLARE_OBJECT_TYPE_ENUM
};


LiveObjectType GetObjectType(HeapObject* heap_obj) {
  // TODO(mlam): investigate usint Map::instance_type() instead.
#define CHECK_FOR_OBJECT_TYPE(type, name) \
  if (heap_obj->Is##type()) return kType##type;
  FOR_EACH_LIVE_OBJECT_TYPE(CHECK_FOR_OBJECT_TYPE)
#undef CHECK_FOR_OBJECT_TYPE

  UNREACHABLE();
  return kInvalidLiveObjType;
}


inline const char* GetObjectTypeDesc(LiveObjectType type) {
  static const char* const name[kNumberOfTypes] = {
  #define DEFINE_OBJECT_TYPE_NAME(type, name) name,
    FOR_EACH_LIVE_OBJECT_TYPE(DEFINE_OBJECT_TYPE_NAME)
    "invalid"
  #undef DEFINE_OBJECT_TYPE_NAME
  };
  ASSERT(type < kNumberOfTypes);
  return name[type];
}


const char* GetObjectTypeDesc(HeapObject* heap_obj) {
  LiveObjectType type = GetObjectType(heap_obj);
  return GetObjectTypeDesc(type);
}


bool IsOfType(LiveObjectType type, HeapObject *obj) {
  // Note: there are types that are more general (e.g. JSObject) that would
  // have passed the Is##type_() test for more specialized types (e.g.
  // JSFunction).  If we find a more specialized match but we're looking for
  // the general type, then we should reject the ones that matches the
  // specialized type.
#define CHECK_OBJECT_TYPE(type_, name) \
  if (obj->Is##type_()) return (type == kType##type_);

  FOR_EACH_LIVE_OBJECT_TYPE(CHECK_OBJECT_TYPE)
#undef CHECK_OBJECT_TYPE

  return false;
}


const AllocationSpace kInvalidSpace = static_cast<AllocationSpace>(-1);

static AllocationSpace FindSpaceFor(String* space_str) {
  SmartPointer<char> s =
      space_str->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);

  const char* key_str = *s;
  switch (key_str[0]) {
    case 'c':
      if (strcmp(key_str, "cell") == 0) return CELL_SPACE;
      if (strcmp(key_str, "code") == 0) return CODE_SPACE;
      break;
    case 'l':
      if (strcmp(key_str, "lo") == 0) return LO_SPACE;
      break;
    case 'm':
      if (strcmp(key_str, "map") == 0) return MAP_SPACE;
      break;
    case 'n':
      if (strcmp(key_str, "new") == 0) return NEW_SPACE;
      break;
    case 'o':
      if (strcmp(key_str, "old-pointer") == 0) return OLD_POINTER_SPACE;
      if (strcmp(key_str, "old-data") == 0) return OLD_DATA_SPACE;
      break;
  }
  return kInvalidSpace;
}


static bool InSpace(AllocationSpace space, HeapObject *heap_obj) {
  if (space != LO_SPACE) {
    return Heap::InSpace(heap_obj, space);
  }

  // This is an optimization to speed up the check for an object in the LO
  // space by exclusion because we know that all object pointers passed in
  // here are guaranteed to be in the heap.  Hence, it is safe to infer
  // using an exclusion test.
  // Note: calling Heap::InSpace(heap_obj, LO_SPACE) is too slow for our
  // filters.
  int first_space = static_cast<int>(FIRST_SPACE);
  int last_space = static_cast<int>(LO_SPACE);
  for (int sp = first_space; sp < last_space; sp++) {
    if (Heap::InSpace(heap_obj, static_cast<AllocationSpace>(sp))) {
      return false;
    }
  }
  SLOW_ASSERT(Heap::InSpace(heap_obj, LO_SPACE));
  return true;
}


static LiveObjectType FindTypeFor(String* type_str) {
  SmartPointer<char> s =
      type_str->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);

#define CHECK_OBJECT_TYPE(type_, name) { \
    const char* type_desc = GetObjectTypeDesc(kType##type_); \
    const char* key_str = *s; \
    if (strstr(type_desc, key_str) != NULL) return kType##type_; \
  }
  FOR_EACH_LIVE_OBJECT_TYPE(CHECK_OBJECT_TYPE)
#undef CHECK_OBJECT_TYPE

  return kInvalidLiveObjType;
}


class LolFilter {
 public:
  explicit LolFilter(Handle<JSObject> filter_obj);

  inline bool is_active() const { return is_active_; }
  inline bool Matches(HeapObject* obj) {
    return !is_active() || MatchesSlow(obj);
  }

 private:
  void InitTypeFilter(Handle<JSObject> filter_obj);
  void InitSpaceFilter(Handle<JSObject> filter_obj);
  void InitPropertyFilter(Handle<JSObject> filter_obj);
  bool MatchesSlow(HeapObject* obj);

  bool is_active_;
  LiveObjectType type_;
  AllocationSpace space_;
  Handle<String> prop_;
};


LolFilter::LolFilter(Handle<JSObject> filter_obj)
    : is_active_(false),
      type_(kInvalidLiveObjType),
      space_(kInvalidSpace),
      prop_() {
  if (filter_obj.is_null()) return;

  InitTypeFilter(filter_obj);
  InitSpaceFilter(filter_obj);
  InitPropertyFilter(filter_obj);
}


void LolFilter::InitTypeFilter(Handle<JSObject> filter_obj) {
  Handle<String> type_sym = Factory::LookupAsciiSymbol("type");
  MaybeObject* maybe_result = filter_obj->GetProperty(*type_sym);
  Object* type_obj;
  if (maybe_result->ToObject(&type_obj)) {
    if (type_obj->IsString()) {
      String* type_str = String::cast(type_obj);
      type_ = FindTypeFor(type_str);
      if (type_ != kInvalidLiveObjType) {
        is_active_ = true;
      }
    }
  }
}


void LolFilter::InitSpaceFilter(Handle<JSObject> filter_obj) {
  Handle<String> space_sym = Factory::LookupAsciiSymbol("space");
  MaybeObject* maybe_result = filter_obj->GetProperty(*space_sym);
  Object* space_obj;
  if (maybe_result->ToObject(&space_obj)) {
    if (space_obj->IsString()) {
      String* space_str = String::cast(space_obj);
      space_ = FindSpaceFor(space_str);
      if (space_ != kInvalidSpace) {
        is_active_ = true;
      }
    }
  }
}


void LolFilter::InitPropertyFilter(Handle<JSObject> filter_obj) {
  Handle<String> prop_sym = Factory::LookupAsciiSymbol("prop");
  MaybeObject* maybe_result = filter_obj->GetProperty(*prop_sym);
  Object* prop_obj;
  if (maybe_result->ToObject(&prop_obj)) {
    if (prop_obj->IsString()) {
      prop_ = Handle<String>(String::cast(prop_obj));
      is_active_ = true;
    }
  }
}


bool LolFilter::MatchesSlow(HeapObject* obj) {
  if ((type_ != kInvalidLiveObjType) && !IsOfType(type_, obj)) {
    return false;  // Fail because obj is not of the type of interest.
  }
  if ((space_ != kInvalidSpace) && !InSpace(space_, obj)) {
    return false;  // Fail because obj is not in the space of interest.
  }
  if (!prop_.is_null() && obj->IsJSObject()) {
    LookupResult result;
    obj->Lookup(*prop_, &result);
    if (!result.IsProperty()) {
      return false;  // Fail because obj does not have the property of interest.
    }
  }
  return true;
}


class LolIterator {
 public:
  LolIterator(LiveObjectList* older, LiveObjectList* newer)
      : older_(older),
        newer_(newer),
        curr_(0),
        elements_(0),
        count_(0),
        index_(0) { }

  inline void Init() {
    SetCurrent(newer_);
    // If the elements_ list is empty, then move on to the next list as long
    // as we're not at the last list (indicated by done()).
    while ((elements_ == NULL) && !Done()) {
      SetCurrent(curr_->prev_);
    }
  }

  inline bool Done() const {
    return (curr_ == older_);
  }

  // Object level iteration.
  inline void Next() {
    index_++;
    if (index_ >= count_) {
      // Iterate backwards until we get to the oldest list.
      while (!Done()) {
        SetCurrent(curr_->prev_);
        // If we have elements to process, we're good to go.
        if (elements_ != NULL) break;

        // Else, we should advance to the next older list.
      }
    }
  }

  inline int Id() const {
    return elements_[index_].id_;
  }
  inline HeapObject* Obj() const {
    return elements_[index_].obj_;
  }

  inline int LolObjCount() const {
    if (curr_ != NULL) return curr_->obj_count_;
    return 0;
  }

 protected:
  inline void SetCurrent(LiveObjectList* new_curr) {
    curr_ = new_curr;
    if (curr_ != NULL) {
      elements_ = curr_->elements_;
      count_ = curr_->obj_count_;
      index_ = 0;
    }
  }

  LiveObjectList* older_;
  LiveObjectList* newer_;
  LiveObjectList* curr_;
  LiveObjectList::Element* elements_;
  int count_;
  int index_;
};


class LolForwardIterator : public LolIterator {
 public:
  LolForwardIterator(LiveObjectList* first, LiveObjectList* last)
      : LolIterator(first, last) {
  }

  inline void Init() {
    SetCurrent(older_);
    // If the elements_ list is empty, then move on to the next list as long
    // as we're not at the last list (indicated by Done()).
    while ((elements_ == NULL) && !Done()) {
      SetCurrent(curr_->next_);
    }
  }

  inline bool Done() const {
    return (curr_ == newer_);
  }

  // Object level iteration.
  inline void Next() {
    index_++;
    if (index_ >= count_) {
      // Done with current list.  Move on to the next.
      while (!Done()) {  // If not at the last list already, ...
        SetCurrent(curr_->next_);
        // If we have elements to process, we're good to go.
        if (elements_ != NULL) break;

        // Else, we should advance to the next list.
      }
    }
  }
};


// Minimizes the white space in a string.  Tabs and newlines are replaced
// with a space where appropriate.
static int CompactString(char* str) {
  char* src = str;
  char* dst = str;
  char prev_ch = 0;
  while (*dst != '\0') {
    char ch = *src++;
    // We will treat non-ascii chars as '?'.
    if ((ch & 0x80) != 0) {
      ch = '?';
    }
    // Compact contiguous whitespace chars into a single ' '.
    if (isspace(ch)) {
      if (prev_ch != ' ') *dst++ = ' ';
      prev_ch = ' ';
      continue;
    }
    *dst++ = ch;
    prev_ch = ch;
  }
  return (dst - str);
}


// Generates a custom description based on the specific type of
// object we're looking at.  We only generate specialized
// descriptions where we can.  In all other cases, we emit the
// generic info.
static void GenerateObjectDesc(HeapObject* obj,
                               char* buffer,
                               int buffer_size) {
  Vector<char> buffer_v(buffer, buffer_size);
  ASSERT(obj != NULL);
  if (obj->IsJSArray()) {
    JSArray* jsarray = JSArray::cast(obj);
    double length = jsarray->length()->Number();
    OS::SNPrintF(buffer_v,
                 "%p <%s> len %g",
                 reinterpret_cast<void*>(obj),
                 GetObjectTypeDesc(obj),
                 length);

  } else if (obj->IsString()) {
    String *str = String::cast(obj);
    // Only grab up to 160 chars in case they are double byte.
    // We'll only dump 80 of them after we compact them.
    const int kMaxCharToDump = 80;
    const int kMaxBufferSize = kMaxCharToDump * 2;
    SmartPointer<char> str_sp = str->ToCString(DISALLOW_NULLS,
                                               ROBUST_STRING_TRAVERSAL,
                                               0,
                                               kMaxBufferSize);
    char* str_cstr = *str_sp;
    int length = CompactString(str_cstr);
    OS::SNPrintF(buffer_v,
                 "%p <%s> '%.80s%s'",
                 reinterpret_cast<void*>(obj),
                 GetObjectTypeDesc(obj),
                 str_cstr,
                 (length > kMaxCharToDump) ? "..." : "");

  } else if (obj->IsJSFunction() || obj->IsSharedFunctionInfo()) {
    SharedFunctionInfo* sinfo;
    if (obj->IsJSFunction()) {
      JSFunction* func = JSFunction::cast(obj);
      sinfo = func->shared();
    } else {
      sinfo = SharedFunctionInfo::cast(obj);
    }

    String* name = sinfo->DebugName();
    SmartPointer<char> name_sp =
        name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
    char* name_cstr = *name_sp;

    HeapStringAllocator string_allocator;
    StringStream stream(&string_allocator);
    sinfo->SourceCodePrint(&stream, 50);
    SmartPointer<const char> source_sp = stream.ToCString();
    const char* source_cstr = *source_sp;

    OS::SNPrintF(buffer_v,
                 "%p <%s> '%s' %s",
                 reinterpret_cast<void*>(obj),
                 GetObjectTypeDesc(obj),
                 name_cstr,
                 source_cstr);

  } else if (obj->IsFixedArray()) {
    FixedArray* fixed = FixedArray::cast(obj);

    OS::SNPrintF(buffer_v,
                 "%p <%s> len %d",
                 reinterpret_cast<void*>(obj),
                 GetObjectTypeDesc(obj),
                 fixed->length());

  } else {
    OS::SNPrintF(buffer_v,
                 "%p <%s>",
                 reinterpret_cast<void*>(obj),
                 GetObjectTypeDesc(obj));
  }
}


// Utility function for filling in a line of detail in a verbose dump.
static bool AddObjDetail(Handle<FixedArray> arr,
                         int index,
                         int obj_id,
                         Handle<HeapObject> target,
                         const char* desc_str,
                         Handle<String> id_sym,
                         Handle<String> desc_sym,
                         Handle<String> size_sym,
                         Handle<JSObject> detail,
                         Handle<String> desc,
                         Handle<Object> error) {
  detail = Factory::NewJSObject(Top::object_function());
  if (detail->IsFailure()) {
    error = detail;
    return false;
  }

  int size = 0;
  char buffer[512];
  if (desc_str == NULL) {
    ASSERT(!target.is_null());
    HeapObject* obj = *target;
    GenerateObjectDesc(obj, buffer, sizeof(buffer));
    desc_str = buffer;
    size = obj->Size();
  }
  desc = Factory::NewStringFromAscii(CStrVector(desc_str));
  if (desc->IsFailure()) {
    error = desc;
    return false;
  }

595 596 597 598
  { MaybeObject* maybe_result = detail->SetProperty(*id_sym,
                                                    Smi::FromInt(obj_id),
                                                    NONE,
                                                    kNonStrictMode);
599 600
    if (maybe_result->IsFailure()) return false;
  }
601 602 603 604
  { MaybeObject* maybe_result = detail->SetProperty(*desc_sym,
                                                    *desc,
                                                    NONE,
                                                    kNonStrictMode);
605 606
    if (maybe_result->IsFailure()) return false;
  }
607 608 609 610
  { MaybeObject* maybe_result = detail->SetProperty(*size_sym,
                                                    Smi::FromInt(size),
                                                    NONE,
                                                    kNonStrictMode);
611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148
    if (maybe_result->IsFailure()) return false;
  }

  arr->set(index, *detail);
  return true;
}


class DumpWriter {
 public:
  virtual ~DumpWriter() {}

  virtual void ComputeTotalCountAndSize(LolFilter* filter,
                                        int* count,
                                        int* size) = 0;
  virtual bool Write(Handle<FixedArray> elements_arr,
                     int start,
                     int dump_limit,
                     LolFilter* filter,
                     Handle<Object> error) = 0;
};


class LolDumpWriter: public DumpWriter {
 public:
  LolDumpWriter(LiveObjectList* older, LiveObjectList* newer)
      : older_(older), newer_(newer) {
  }

  void ComputeTotalCountAndSize(LolFilter* filter, int* count, int* size) {
    *count = 0;
    *size = 0;

    LolIterator it(older_, newer_);
    for (it.Init(); !it.Done(); it.Next()) {
      HeapObject* heap_obj = it.Obj();
      if (!filter->Matches(heap_obj)) {
        continue;
      }

      *size += heap_obj->Size();
      (*count)++;
    }
  }

  bool Write(Handle<FixedArray> elements_arr,
             int start,
             int dump_limit,
             LolFilter* filter,
             Handle<Object> error) {
    // The lols are listed in latest to earliest.  We want to dump from
    // earliest to latest.  So, compute the last element to start with.
    int index = 0;
    int count = 0;

    // Prefetch some needed symbols.
    Handle<String> id_sym = Factory::LookupAsciiSymbol("id");
    Handle<String> desc_sym = Factory::LookupAsciiSymbol("desc");
    Handle<String> size_sym = Factory::LookupAsciiSymbol("size");

    // Fill the array with the lol object details.
    Handle<JSObject> detail;
    Handle<String> desc;
    Handle<HeapObject> target;

    LiveObjectList* first_lol = (older_ != NULL) ?
                                older_->next_ : LiveObjectList::first_;
    LiveObjectList* last_lol = (newer_ != NULL) ? newer_->next_ : NULL;

    LolForwardIterator it(first_lol, last_lol);
    for (it.Init(); !it.Done() && (index < dump_limit); it.Next()) {
      HeapObject* heap_obj = it.Obj();

      // Skip objects that have been filtered out.
      if (!filter->Matches(heap_obj)) {
        continue;
      }

      // Only report objects that are in the section of interest.
      if (count >= start) {
        target = Handle<HeapObject>(heap_obj);
        bool success = AddObjDetail(elements_arr,
                                    index++,
                                    it.Id(),
                                    target,
                                    NULL,
                                    id_sym,
                                    desc_sym,
                                    size_sym,
                                    detail,
                                    desc,
                                    error);
        if (!success) return false;
      }
      count++;
    }
    return true;
  }

 private:
  LiveObjectList* older_;
  LiveObjectList* newer_;
};


class RetainersDumpWriter: public DumpWriter {
 public:
  RetainersDumpWriter(Handle<HeapObject> target,
                      Handle<JSObject> instance_filter,
                      Handle<JSFunction> args_function)
      : target_(target),
        instance_filter_(instance_filter),
        args_function_(args_function) {
  }

  void ComputeTotalCountAndSize(LolFilter* filter, int* count, int* size) {
    Handle<FixedArray> retainers_arr;
    Handle<Object> error;

    *size = -1;
    LiveObjectList::GetRetainers(target_,
                                 instance_filter_,
                                 retainers_arr,
                                 0,
                                 Smi::kMaxValue,
                                 count,
                                 filter,
                                 NULL,
                                 *args_function_,
                                 error);
  }

  bool Write(Handle<FixedArray> elements_arr,
             int start,
             int dump_limit,
             LolFilter* filter,
             Handle<Object> error) {
    int dummy;
    int count;

    // Fill the retainer objects.
    count = LiveObjectList::GetRetainers(target_,
                                         instance_filter_,
                                         elements_arr,
                                         start,
                                         dump_limit,
                                         &dummy,
                                         filter,
                                         NULL,
                                         *args_function_,
                                         error);
    if (count < 0) {
        return false;
    }
    return true;
  }

 private:
  Handle<HeapObject> target_;
  Handle<JSObject> instance_filter_;
  Handle<JSFunction> args_function_;
};


class LiveObjectSummary {
 public:
  explicit LiveObjectSummary(LolFilter* filter)
      : total_count_(0),
        total_size_(0),
        found_root_(false),
        found_weak_root_(false),
        filter_(filter) {
    memset(counts_, 0, sizeof(counts_[0]) * kNumberOfEntries);
    memset(sizes_, 0, sizeof(sizes_[0]) * kNumberOfEntries);
  }

  void Add(HeapObject* heap_obj) {
    int size = heap_obj->Size();
    LiveObjectType type = GetObjectType(heap_obj);
    ASSERT(type != kInvalidLiveObjType);
    counts_[type]++;
    sizes_[type] += size;
    total_count_++;
    total_size_ += size;
  }

  void set_found_root() { found_root_ = true; }
  void set_found_weak_root() { found_weak_root_ = true; }

  inline int Count(LiveObjectType type) {
    return counts_[type];
  }
  inline int Size(LiveObjectType type) {
    return sizes_[type];
  }
  inline int total_count() {
    return total_count_;
  }
  inline int total_size() {
    return total_size_;
  }
  inline bool found_root() {
    return found_root_;
  }
  inline bool found_weak_root() {
    return found_weak_root_;
  }
  int GetNumberOfEntries() {
    int entries = 0;
    for (int i = 0; i < kNumberOfEntries; i++) {
      if (counts_[i]) entries++;
    }
    return entries;
  }

  inline LolFilter* filter() { return filter_; }

  static const int kNumberOfEntries = kNumberOfTypes;

 private:
  int counts_[kNumberOfEntries];
  int sizes_[kNumberOfEntries];
  int total_count_;
  int total_size_;
  bool found_root_;
  bool found_weak_root_;

  LolFilter *filter_;
};


// Abstraction for a summary writer.
class SummaryWriter {
 public:
  virtual ~SummaryWriter() {}
  virtual void Write(LiveObjectSummary* summary) = 0;
};


// A summary writer for filling in a summary of lol lists and diffs.
class LolSummaryWriter: public SummaryWriter {
 public:
  LolSummaryWriter(LiveObjectList *older_lol,
                   LiveObjectList *newer_lol)
      : older_(older_lol), newer_(newer_lol) {
  }

  void Write(LiveObjectSummary* summary) {
    LolFilter* filter = summary->filter();

    // Fill the summary with the lol object details.
    LolIterator it(older_, newer_);
    for (it.Init(); !it.Done(); it.Next()) {
      HeapObject* heap_obj = it.Obj();
      if (!filter->Matches(heap_obj)) {
        continue;
      }
      summary->Add(heap_obj);
    }
  }

 private:
  LiveObjectList* older_;
  LiveObjectList* newer_;
};


// A summary writer for filling in a retainers list.
class RetainersSummaryWriter: public SummaryWriter {
 public:
  RetainersSummaryWriter(Handle<HeapObject> target,
                         Handle<JSObject> instance_filter,
                         Handle<JSFunction> args_function)
      : target_(target),
        instance_filter_(instance_filter),
        args_function_(args_function) {
  }

  void Write(LiveObjectSummary* summary) {
    Handle<FixedArray> retainers_arr;
    Handle<Object> error;
    int dummy_total_count;
    LiveObjectList::GetRetainers(target_,
                                 instance_filter_,
                                 retainers_arr,
                                 0,
                                 Smi::kMaxValue,
                                 &dummy_total_count,
                                 summary->filter(),
                                 summary,
                                 *args_function_,
                                 error);
  }

 private:
  Handle<HeapObject> target_;
  Handle<JSObject> instance_filter_;
  Handle<JSFunction> args_function_;
};


uint32_t LiveObjectList::next_element_id_ = 1;
int LiveObjectList::list_count_ = 0;
int LiveObjectList::last_id_ = 0;
LiveObjectList* LiveObjectList::first_ = NULL;
LiveObjectList* LiveObjectList::last_ = NULL;


LiveObjectList::LiveObjectList(LiveObjectList* prev, int capacity)
    : prev_(prev),
      next_(NULL),
      capacity_(capacity),
      obj_count_(0) {
  elements_ = NewArray<Element>(capacity);
  id_ = ++last_id_;

  list_count_++;
}


LiveObjectList::~LiveObjectList() {
  DeleteArray<Element>(elements_);
  delete prev_;
}


int LiveObjectList::GetTotalObjCountAndSize(int* size_p) {
  int size = 0;
  int count = 0;
  LiveObjectList *lol = this;
  do {
    // Only compute total size if requested i.e. when size_p is not null.
    if (size_p != NULL) {
      Element* elements = lol->elements_;
      for (int i = 0; i < lol->obj_count_; i++) {
        HeapObject* heap_obj = elements[i].obj_;
        size += heap_obj->Size();
      }
    }
    count += lol->obj_count_;
    lol = lol->prev_;
  } while (lol != NULL);

  if (size_p != NULL) {
    *size_p = size;
  }
  return count;
}


// Adds an object to the lol.
// Returns true if successful, else returns false.
bool LiveObjectList::Add(HeapObject* obj) {
  // If the object is already accounted for in the prev list which we inherit
  // from, then no need to add it to this list.
  if ((prev() != NULL) && (prev()->Find(obj) != NULL)) {
    return true;
  }
  ASSERT(obj_count_ <= capacity_);
  if (obj_count_ == capacity_) {
    // The heap must have grown and we have more objects than capacity to store
    // them.
    return false;  // Fail this addition.
  }
  Element& element = elements_[obj_count_++];
  element.id_ = next_element_id_++;
  element.obj_ = obj;
  return true;
}


// Comparator used for sorting and searching the lol.
int LiveObjectList::CompareElement(const Element* a, const Element* b) {
  const HeapObject* obj1 = a->obj_;
  const HeapObject* obj2 = b->obj_;
  // For lol elements, it doesn't matter which comes first if 2 elements point
  // to the same object (which gets culled later).  Hence, we only care about
  // the the greater than / less than relationships.
  return (obj1 > obj2) ? 1 : (obj1 == obj2) ? 0 : -1;
}


// Looks for the specified object in the lol, and returns its element if found.
LiveObjectList::Element* LiveObjectList::Find(HeapObject* obj) {
  LiveObjectList* lol = this;
  Element key;
  Element* result = NULL;

  key.obj_ = obj;
  // Iterate through the chain of lol's to look for the object.
  while ((result == NULL) && (lol != NULL)) {
    result = reinterpret_cast<Element*>(
        bsearch(&key, lol->elements_, lol->obj_count_,
                sizeof(Element),
                reinterpret_cast<RawComparer>(CompareElement)));
    lol = lol->prev_;
  }
  return result;
}


// "Nullifies" (convert the HeapObject* into an SMI) so that it will get cleaned
// up in the GCEpilogue, while preserving the sort order of the lol.
// NOTE: the lols need to be already sorted before NullifyMostRecent() is
// called.
void LiveObjectList::NullifyMostRecent(HeapObject* obj) {
  LiveObjectList* lol = last();
  Element key;
  Element* result = NULL;

  key.obj_ = obj;
  // Iterate through the chain of lol's to look for the object.
  while (lol != NULL) {
    result = reinterpret_cast<Element*>(
        bsearch(&key, lol->elements_, lol->obj_count_,
                sizeof(Element),
                reinterpret_cast<RawComparer>(CompareElement)));
    if (result != NULL) {
      // Since there may be more than one (we are nullifying dup's after all),
      // find the first in the current lol, and nullify that.  The lol should
      // be sorted already to make this easy (see the use of SortAll()).
      int i = result - lol->elements_;

      // NOTE: we sort the lol in increasing order.  So, if an object has been
      // "nullified" (its lowest bit will be cleared to make it look like an
      // SMI), it would/should show up before the equivalent dups that have not
      // yet been "nullified".  Hence, we should be searching backwards for the
      // first occurence of a matching object and nullify that instance.  This
      // will ensure that we preserve the expected sorting order.
      for (i--; i > 0; i--) {
        Element* element = &lol->elements_[i];
        HeapObject* curr_obj = element->obj_;
        if (curr_obj != obj) {
            break;  // No more matches.  Let's move on.
        }
        result = element;  // Let this earlier match be the result.
      }

      // Nullify the object.
      NullifyNonLivePointer(&result->obj_);
      return;
    }
    lol = lol->prev_;
  }
}


// Sorts the lol.
void LiveObjectList::Sort() {
  if (obj_count_ > 0) {
    Vector<Element> elements_v(elements_, obj_count_);
    elements_v.Sort(CompareElement);
  }
}


// Sorts all captured lols starting from the latest.
void LiveObjectList::SortAll() {
  LiveObjectList* lol = last();
  while (lol != NULL) {
    lol->Sort();
    lol = lol->prev_;
  }
}


// Counts the number of objects in the heap.
static int CountHeapObjects() {
  int count = 0;
  // Iterate over all the heap spaces and count the number of objects.
  HeapIterator iterator(HeapIterator::kFilterFreeListNodes);
  HeapObject* heap_obj = NULL;
  while ((heap_obj = iterator.next()) != NULL) {
    count++;
  }
  return count;
}


// Captures a current snapshot of all objects in the heap.
MaybeObject* LiveObjectList::Capture() {
  HandleScope scope;

  // Count the number of objects in the heap.
  int total_count = CountHeapObjects();
  int count = total_count;
  int size = 0;

  LiveObjectList* last_lol = last();
  if (last_lol != NULL) {
    count -= last_lol->TotalObjCount();
  }

  LiveObjectList* lol;

  // Create a lol large enough to track all the objects.
  lol = new LiveObjectList(last_lol, count);
  if (lol == NULL) {
    return NULL;  // No memory to proceed.
  }

  // The HeapIterator needs to be in its own scope because it disables
  // allocation, and we need allocate below.
  {
    // Iterate over all the heap spaces and add the objects.
    HeapIterator iterator(HeapIterator::kFilterFreeListNodes);
    HeapObject* heap_obj = NULL;
    bool failed = false;
    while (!failed && (heap_obj = iterator.next()) != NULL) {
      failed = !lol->Add(heap_obj);
      size += heap_obj->Size();
    }
    ASSERT(!failed);

    lol->Sort();

    // Add the current lol to the list of lols.
    if (last_ != NULL) {
      last_->next_ = lol;
    } else {
      first_ = lol;
    }
    last_ = lol;

#ifdef VERIFY_LOL
    if (FLAG_verify_lol) {
      Verify(true);
    }
#endif
  }

  Handle<String> id_sym = Factory::LookupAsciiSymbol("id");
  Handle<String> count_sym = Factory::LookupAsciiSymbol("count");
  Handle<String> size_sym = Factory::LookupAsciiSymbol("size");

  Handle<JSObject> result = Factory::NewJSObject(Top::object_function());
  if (result->IsFailure()) return Object::cast(*result);

1149 1150 1151 1152
  { MaybeObject* maybe_result = result->SetProperty(*id_sym,
                                                    Smi::FromInt(lol->id()),
                                                    NONE,
                                                    kNonStrictMode);
1153 1154
    if (maybe_result->IsFailure()) return maybe_result;
  }
1155 1156 1157 1158
  { MaybeObject* maybe_result = result->SetProperty(*count_sym,
                                                    Smi::FromInt(total_count),
                                                    NONE,
                                                    kNonStrictMode);
1159 1160
    if (maybe_result->IsFailure()) return maybe_result;
  }
1161 1162 1163 1164
  { MaybeObject* maybe_result = result->SetProperty(*size_sym,
                                                    Smi::FromInt(size),
                                                    NONE,
                                                    kNonStrictMode);
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
    if (maybe_result->IsFailure()) return maybe_result;
  }

  return *result;
}


// Delete doesn't actually deletes an lol.  It just marks it as invisible since
// its contents are considered to be part of subsequent lists as well.  The
// only time we'll actually delete the lol is when we Reset() or if the lol is
// invisible, and its element count reaches 0.
bool LiveObjectList::Delete(int id) {
  LiveObjectList *lol = last();
  while (lol != NULL) {
    if (lol->id() == id) {
      break;
    }
    lol = lol->prev_;
  }

  // If no lol is found for this id, then we fail to delete.
  if (lol == NULL) return false;

  // Else, mark the lol as invisible i.e. id == 0.
  lol->id_ = 0;
  list_count_--;
  ASSERT(list_count_ >= 0);
  if (lol->obj_count_ == 0) {
    // Point the next lol's prev to this lol's prev.
    LiveObjectList* next = lol->next_;
    LiveObjectList* prev = lol->prev_;
    // Point next's prev to prev.
    if (next != NULL) {
      next->prev_ = lol->prev_;
    } else {
      last_ = lol->prev_;
    }
    // Point prev's next to next.
    if (prev != NULL) {
      prev->next_ = lol->next_;
    } else {
      first_ = lol->next_;
    }

    lol->prev_ = NULL;
    lol->next_ = NULL;

    // Delete this now empty and invisible lol.
    delete lol;
  }

  // Just in case we've marked everything invisible, then clean up completely.
  if (list_count_ == 0) {
    Reset();
  }

  return true;
}


MaybeObject* LiveObjectList::Dump(int older_id,
                                  int newer_id,
                                  int start_idx,
                                  int dump_limit,
                                  Handle<JSObject> filter_obj) {
  if ((older_id < 0) || (newer_id < 0) || (last() == NULL)) {
    return Failure::Exception();  // Fail: 0 is not a valid lol id.
  }
  if (newer_id < older_id) {
    // They are not in the expected order.  Swap them.
    int temp = older_id;
    older_id = newer_id;
    newer_id = temp;
  }

  LiveObjectList *newer_lol = FindLolForId(newer_id, last());
  LiveObjectList *older_lol = FindLolForId(older_id, newer_lol);

  // If the id is defined, and we can't find a LOL for it, then we have an
  // invalid id.
  if ((newer_id != 0) && (newer_lol == NULL)) {
    return Failure::Exception();  // Fail: the newer lol id is invalid.
  }
  if ((older_id != 0) && (older_lol == NULL)) {
    return Failure::Exception();  // Fail: the older lol id is invalid.
  }

  LolFilter filter(filter_obj);
  LolDumpWriter writer(older_lol, newer_lol);
  return DumpPrivate(&writer, start_idx, dump_limit, &filter);
}


MaybeObject* LiveObjectList::DumpPrivate(DumpWriter* writer,
                                         int start,
                                         int dump_limit,
                                         LolFilter* filter) {
  HandleScope scope;

  // Calculate the number of entries of the dump.
  int count = -1;
  int size = -1;
  writer->ComputeTotalCountAndSize(filter, &count, &size);

  // Adjust for where to start the dump.
  if ((start < 0) || (start >= count)) {
    return Failure::Exception();  // invalid start.
  }

  int remaining_count = count - start;
  if (dump_limit > remaining_count) {
    dump_limit = remaining_count;
  }

  // Allocate an array to hold the result.
  Handle<FixedArray> elements_arr = Factory::NewFixedArray(dump_limit);
  if (elements_arr->IsFailure()) return Object::cast(*elements_arr);

  // Fill in the dump.
  Handle<Object> error;
  bool success = writer->Write(elements_arr,
                               start,
                               dump_limit,
                               filter,
                               error);
  if (!success) return Object::cast(*error);

  MaybeObject* maybe_result;

  // Allocate the result body.
  Handle<JSObject> body = Factory::NewJSObject(Top::object_function());
  if (body->IsFailure()) return Object::cast(*body);

  // Set the updated body.count.
  Handle<String> count_sym = Factory::LookupAsciiSymbol("count");
1300 1301 1302 1303
  maybe_result = body->SetProperty(*count_sym,
                                   Smi::FromInt(count),
                                   NONE,
                                   kNonStrictMode);
1304 1305 1306 1307 1308
  if (maybe_result->IsFailure()) return maybe_result;

  // Set the updated body.size if appropriate.
  if (size >= 0) {
    Handle<String> size_sym = Factory::LookupAsciiSymbol("size");
1309 1310 1311 1312
    maybe_result = body->SetProperty(*size_sym,
                                     Smi::FromInt(size),
                                     NONE,
                                     kNonStrictMode);
1313 1314 1315 1316 1317
    if (maybe_result->IsFailure()) return maybe_result;
  }

  // Set body.first_index.
  Handle<String> first_sym = Factory::LookupAsciiSymbol("first_index");
1318 1319 1320 1321
  maybe_result = body->SetProperty(*first_sym,
                                   Smi::FromInt(start),
                                   NONE,
                                   kNonStrictMode);
1322 1323 1324 1325 1326 1327 1328 1329 1330
  if (maybe_result->IsFailure()) return maybe_result;

  // Allocate the JSArray of the elements.
  Handle<JSObject> elements = Factory::NewJSObject(Top::array_function());
  if (elements->IsFailure()) return Object::cast(*elements);
  Handle<JSArray>::cast(elements)->SetContent(*elements_arr);

  // Set body.elements.
  Handle<String> elements_sym = Factory::LookupAsciiSymbol("elements");
1331 1332 1333 1334
  maybe_result = body->SetProperty(*elements_sym,
                                   *elements,
                                   NONE,
                                   kNonStrictMode);
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
  if (maybe_result->IsFailure()) return maybe_result;

  return *body;
}


MaybeObject* LiveObjectList::Summarize(int older_id,
                                       int newer_id,
                                       Handle<JSObject> filter_obj) {
  if ((older_id < 0) || (newer_id < 0) || (last() == NULL)) {
    return Failure::Exception();  // Fail: 0 is not a valid lol id.
  }
  if (newer_id < older_id) {
    // They are not in the expected order.  Swap them.
    int temp = older_id;
    older_id = newer_id;
    newer_id = temp;
  }

  LiveObjectList *newer_lol = FindLolForId(newer_id, last());
  LiveObjectList *older_lol = FindLolForId(older_id, newer_lol);

  // If the id is defined, and we can't find a LOL for it, then we have an
  // invalid id.
  if ((newer_id != 0) && (newer_lol == NULL)) {
    return Failure::Exception();  // Fail: the newer lol id is invalid.
  }
  if ((older_id != 0) && (older_lol == NULL)) {
    return Failure::Exception();  // Fail: the older lol id is invalid.
  }

  LolFilter filter(filter_obj);
  LolSummaryWriter writer(older_lol, newer_lol);
  return SummarizePrivate(&writer, &filter, false);
}


// Creates a summary report for the debugger.
// Note: the SummaryWriter takes care of iterating over objects and filling in
// the summary.
MaybeObject* LiveObjectList::SummarizePrivate(SummaryWriter* writer,
                                              LolFilter* filter,
                                              bool is_tracking_roots) {
  HandleScope scope;
  MaybeObject* maybe_result;

  LiveObjectSummary summary(filter);
  writer->Write(&summary);

  // The result body will look like this:
  // body: {
  //   count: <total_count>,
  //   size: <total_size>,
  //   found_root: <boolean>,       // optional.
  //   found_weak_root: <boolean>,  // optional.
  //   summary: [
  //     {
  //       desc: "<object type name>",
  //       count: <count>,
  //       size: size
  //     },
  //     ...
  //   ]
  // }

  // Prefetch some needed symbols.
  Handle<String> desc_sym = Factory::LookupAsciiSymbol("desc");
  Handle<String> count_sym = Factory::LookupAsciiSymbol("count");
  Handle<String> size_sym = Factory::LookupAsciiSymbol("size");
  Handle<String> summary_sym = Factory::LookupAsciiSymbol("summary");

  // Allocate the summary array.
  int entries_count = summary.GetNumberOfEntries();
  Handle<FixedArray> summary_arr =
      Factory::NewFixedArray(entries_count);
  if (summary_arr->IsFailure()) return Object::cast(*summary_arr);

  int idx = 0;
  for (int i = 0; i < LiveObjectSummary::kNumberOfEntries; i++) {
    // Allocate the summary record.
    Handle<JSObject> detail = Factory::NewJSObject(Top::object_function());
    if (detail->IsFailure()) return Object::cast(*detail);

    // Fill in the summary record.
    LiveObjectType type = static_cast<LiveObjectType>(i);
    int count = summary.Count(type);
    if (count) {
      const char* desc_cstr = GetObjectTypeDesc(type);
      Handle<String> desc = Factory::LookupAsciiSymbol(desc_cstr);
      int size = summary.Size(type);

1426 1427 1428 1429
      maybe_result = detail->SetProperty(*desc_sym,
                                         *desc,
                                         NONE,
                                         kNonStrictMode);
1430
      if (maybe_result->IsFailure()) return maybe_result;
1431 1432 1433 1434
      maybe_result = detail->SetProperty(*count_sym,
                                         Smi::FromInt(count),
                                         NONE,
                                         kNonStrictMode);
1435
      if (maybe_result->IsFailure()) return maybe_result;
1436 1437 1438 1439
      maybe_result = detail->SetProperty(*size_sym,
                                         Smi::FromInt(size),
                                         NONE,
                                         kNonStrictMode);
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
      if (maybe_result->IsFailure()) return maybe_result;

      summary_arr->set(idx++, *detail);
    }
  }

  // Wrap the summary fixed array in a JS array.
  Handle<JSObject> summary_obj = Factory::NewJSObject(Top::array_function());
  if (summary_obj->IsFailure()) return Object::cast(*summary_obj);
  Handle<JSArray>::cast(summary_obj)->SetContent(*summary_arr);

  // Create the body object.
  Handle<JSObject> body = Factory::NewJSObject(Top::object_function());
  if (body->IsFailure()) return Object::cast(*body);

  // Fill out the body object.
  int total_count = summary.total_count();
  int total_size = summary.total_size();
1458 1459 1460 1461
  maybe_result = body->SetProperty(*count_sym,
                                   Smi::FromInt(total_count),
                                   NONE,
                                   kNonStrictMode);
1462 1463
  if (maybe_result->IsFailure()) return maybe_result;

1464 1465 1466 1467
  maybe_result = body->SetProperty(*size_sym,
                                   Smi::FromInt(total_size),
                                   NONE,
                                   kNonStrictMode);
1468 1469 1470 1471 1472 1473 1474 1475
  if (maybe_result->IsFailure()) return maybe_result;

  if (is_tracking_roots) {
    int found_root = summary.found_root();
    int found_weak_root = summary.found_weak_root();
    Handle<String> root_sym = Factory::LookupAsciiSymbol("found_root");
    Handle<String> weak_root_sym =
        Factory::LookupAsciiSymbol("found_weak_root");
1476 1477 1478 1479
    maybe_result = body->SetProperty(*root_sym,
                                     Smi::FromInt(found_root),
                                     NONE,
                                     kNonStrictMode);
1480
    if (maybe_result->IsFailure()) return maybe_result;
1481 1482 1483 1484
    maybe_result = body->SetProperty(*weak_root_sym,
                                     Smi::FromInt(found_weak_root),
                                     NONE,
                                     kNonStrictMode);
1485 1486 1487
    if (maybe_result->IsFailure()) return maybe_result;
  }

1488 1489 1490 1491
  maybe_result = body->SetProperty(*summary_sym,
                                   *summary_obj,
                                   NONE,
                                   kNonStrictMode);
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
  if (maybe_result->IsFailure()) return maybe_result;

  return *body;
}


// Returns an array listing the captured lols.
// Note: only dumps the section starting at start_idx and only up to
// dump_limit entries.
MaybeObject* LiveObjectList::Info(int start_idx, int dump_limit) {
  HandleScope scope;
  MaybeObject* maybe_result;

  int total_count = LiveObjectList::list_count();
  int dump_count = total_count;

  // Adjust for where to start the dump.
  if (total_count == 0) {
      start_idx = 0;  // Ensure this to get an empty list.
  } else if ((start_idx < 0) || (start_idx >= total_count)) {
    return Failure::Exception();  // invalid start.
  }
  dump_count -= start_idx;

  // Adjust for the dump limit.
  if (dump_count > dump_limit) {
    dump_count = dump_limit;
  }

  // Allocate an array to hold the result.
  Handle<FixedArray> list = Factory::NewFixedArray(dump_count);
  if (list->IsFailure()) return Object::cast(*list);

  // Prefetch some needed symbols.
  Handle<String> id_sym = Factory::LookupAsciiSymbol("id");
  Handle<String> count_sym = Factory::LookupAsciiSymbol("count");
  Handle<String> size_sym = Factory::LookupAsciiSymbol("size");

  // Fill the array with the lol details.
  int idx = 0;
  LiveObjectList* lol = first_;
  while ((lol != NULL) && (idx < start_idx)) {  // Skip tail entries.
    if (lol->id() != 0) {
      idx++;
    }
    lol = lol->next();
  }
  idx = 0;
  while ((lol != NULL) && (dump_limit != 0)) {
    if (lol->id() != 0) {
      int count;
      int size;
      count = lol->GetTotalObjCountAndSize(&size);

      Handle<JSObject> detail = Factory::NewJSObject(Top::object_function());
      if (detail->IsFailure()) return Object::cast(*detail);

1549 1550 1551 1552
      maybe_result = detail->SetProperty(*id_sym,
                                         Smi::FromInt(lol->id()),
                                         NONE,
                                         kNonStrictMode);
1553
      if (maybe_result->IsFailure()) return maybe_result;
1554 1555 1556 1557
      maybe_result = detail->SetProperty(*count_sym,
                                         Smi::FromInt(count),
                                         NONE,
                                         kNonStrictMode);
1558
      if (maybe_result->IsFailure()) return maybe_result;
1559 1560 1561 1562
      maybe_result = detail->SetProperty(*size_sym,
                                         Smi::FromInt(size),
                                         NONE,
                                         kNonStrictMode);
1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576
      if (maybe_result->IsFailure()) return maybe_result;
      list->set(idx++, *detail);
      dump_limit--;
    }
    lol = lol->next();
  }

  // Return the result as a JS array.
  Handle<JSObject> lols = Factory::NewJSObject(Top::array_function());
  Handle<JSArray>::cast(lols)->SetContent(*list);

  Handle<JSObject> result = Factory::NewJSObject(Top::object_function());
  if (result->IsFailure()) return Object::cast(*result);

1577 1578 1579 1580
  maybe_result = result->SetProperty(*count_sym,
                                     Smi::FromInt(total_count),
                                     NONE,
                                     kNonStrictMode);
1581 1582 1583
  if (maybe_result->IsFailure()) return maybe_result;

  Handle<String> first_sym = Factory::LookupAsciiSymbol("first_index");
1584 1585 1586 1587
  maybe_result = result->SetProperty(*first_sym,
                                     Smi::FromInt(start_idx),
                                     NONE,
                                     kNonStrictMode);
1588 1589 1590
  if (maybe_result->IsFailure()) return maybe_result;

  Handle<String> lists_sym = Factory::LookupAsciiSymbol("lists");
1591 1592 1593 1594
  maybe_result = result->SetProperty(*lists_sym,
                                     *lols,
                                     NONE,
                                     kNonStrictMode);
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941
  if (maybe_result->IsFailure()) return maybe_result;

  return *result;
}


// Deletes all captured lols.
void LiveObjectList::Reset() {
  LiveObjectList *lol = last();
  // Just delete the last.  Each lol will delete it's prev automatically.
  delete lol;

  next_element_id_ = 1;
  list_count_ = 0;
  last_id_ = 0;
  first_ = NULL;
  last_ = NULL;
}


// Gets the object for the specified obj id.
Object* LiveObjectList::GetObj(int obj_id) {
  Element* element = FindElementFor<int>(GetElementId, obj_id);
  if (element != NULL) {
    return Object::cast(element->obj_);
  }
  return Heap::undefined_value();
}


// Gets the obj id for the specified address if valid.
int LiveObjectList::GetObjId(Object* obj) {
  // Make a heap object pointer from the address.
  HeapObject* hobj = HeapObject::cast(obj);
  Element* element = FindElementFor<HeapObject*>(GetElementObj, hobj);
  if (element != NULL) {
    return element->id_;
  }
  return 0;  // Invalid address.
}


// Gets the obj id for the specified address if valid.
Object* LiveObjectList::GetObjId(Handle<String> address) {
  SmartPointer<char> addr_str =
      address->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);

  // Extract the address value from the string.
  int value = static_cast<int>(StringToInt(*address, 16));
  Object* obj = reinterpret_cast<Object*>(value);
  return Smi::FromInt(GetObjId(obj));
}


// Helper class for copying HeapObjects.
class LolVisitor: public ObjectVisitor {
 public:

  LolVisitor(HeapObject* target, Handle<HeapObject> handle_to_skip)
      : target_(target), handle_to_skip_(handle_to_skip), found_(false) {}

  void VisitPointer(Object** p) { CheckPointer(p); }

  void VisitPointers(Object** start, Object** end) {
    // Check all HeapObject pointers in [start, end).
    for (Object** p = start; !found() && p < end; p++) CheckPointer(p);
  }

  inline bool found() const { return found_; }
  inline bool reset() { return found_ = false; }

 private:
  inline void CheckPointer(Object** p) {
    Object* object = *p;
    if (HeapObject::cast(object) == target_) {
      // We may want to skip this handle because the handle may be a local
      // handle in a handle scope in one of our callers.  Once we return,
      // that handle will be popped.  Hence, we don't want to count it as
      // a root that would have kept the target object alive.
      if (!handle_to_skip_.is_null() &&
          handle_to_skip_.location() == reinterpret_cast<HeapObject**>(p)) {
        return;  // Skip this handle.
      }
      found_ = true;
    }
  }

  HeapObject* target_;
  Handle<HeapObject> handle_to_skip_;
  bool found_;
};


inline bool AddRootRetainerIfFound(const LolVisitor& visitor,
                                   LolFilter* filter,
                                   LiveObjectSummary *summary,
                                   void (*SetRootFound)(LiveObjectSummary *s),
                                   int start,
                                   int dump_limit,
                                   int* total_count,
                                   Handle<FixedArray> retainers_arr,
                                   int* count,
                                   int* index,
                                   const char* root_name,
                                   Handle<String> id_sym,
                                   Handle<String> desc_sym,
                                   Handle<String> size_sym,
                                   Handle<Object> error) {
  HandleScope scope;

  // Scratch handles.
  Handle<JSObject> detail;
  Handle<String> desc;
  Handle<HeapObject> retainer;

  if (visitor.found()) {
    if (!filter->is_active()) {
      (*total_count)++;
      if (summary) {
        SetRootFound(summary);
      } else if ((*total_count > start) && ((*index) < dump_limit)) {
        (*count)++;
        if (!retainers_arr.is_null()) {
          return AddObjDetail(retainers_arr,
                              (*index)++,
                              0,
                              retainer,
                              root_name,
                              id_sym,
                              desc_sym,
                              size_sym,
                              detail,
                              desc,
                              error);
        }
      }
    }
  }
  return true;
}


inline void SetFoundRoot(LiveObjectSummary *summary) {
  summary->set_found_root();
}


inline void SetFoundWeakRoot(LiveObjectSummary *summary) {
  summary->set_found_weak_root();
}


int LiveObjectList::GetRetainers(Handle<HeapObject> target,
                                 Handle<JSObject> instance_filter,
                                 Handle<FixedArray> retainers_arr,
                                 int start,
                                 int dump_limit,
                                 int* total_count,
                                 LolFilter* filter,
                                 LiveObjectSummary *summary,
                                 JSFunction* arguments_function,
                                 Handle<Object> error) {
  HandleScope scope;

  // Scratch handles.
  Handle<JSObject> detail;
  Handle<String> desc;
  Handle<HeapObject> retainer;

  // Prefetch some needed symbols.
  Handle<String> id_sym = Factory::LookupAsciiSymbol("id");
  Handle<String> desc_sym = Factory::LookupAsciiSymbol("desc");
  Handle<String> size_sym = Factory::LookupAsciiSymbol("size");

  NoHandleAllocation ha;
  int count = 0;
  int index = 0;
  Handle<JSObject> last_obj;

  *total_count = 0;

  // Iterate roots.
  LolVisitor lol_visitor(*target, target);
  Heap::IterateStrongRoots(&lol_visitor, VISIT_ALL);
  if (!AddRootRetainerIfFound(lol_visitor,
                              filter,
                              summary,
                              SetFoundRoot,
                              start,
                              dump_limit,
                              total_count,
                              retainers_arr,
                              &count,
                              &index,
                              "<root>",
                              id_sym,
                              desc_sym,
                              size_sym,
                              error)) {
    return -1;
  }

  lol_visitor.reset();
  Heap::IterateWeakRoots(&lol_visitor, VISIT_ALL);
  if (!AddRootRetainerIfFound(lol_visitor,
                              filter,
                              summary,
                              SetFoundWeakRoot,
                              start,
                              dump_limit,
                              total_count,
                              retainers_arr,
                              &count,
                              &index,
                              "<weak root>",
                              id_sym,
                              desc_sym,
                              size_sym,
                              error)) {
    return -1;
  }

  // Iterate the live object lists.
  LolIterator it(NULL, last());
  for (it.Init(); !it.Done() && (index < dump_limit); it.Next()) {
    HeapObject* heap_obj = it.Obj();

    // Only look at all JSObjects.
    if (heap_obj->IsJSObject()) {
      // Skip context extension objects and argument arrays as these are
      // checked in the context of functions using them.
      JSObject* obj = JSObject::cast(heap_obj);
      if (obj->IsJSContextExtensionObject() ||
          obj->map()->constructor() == arguments_function) {
        continue;
      }

      // Check if the JS object has a reference to the object looked for.
      if (obj->ReferencesObject(*target)) {
        // Check instance filter if supplied. This is normally used to avoid
        // references from mirror objects (see Runtime_IsInPrototypeChain).
        if (!instance_filter->IsUndefined()) {
          Object* V = obj;
          while (true) {
            Object* prototype = V->GetPrototype();
            if (prototype->IsNull()) {
              break;
            }
            if (*instance_filter == prototype) {
              obj = NULL;  // Don't add this object.
              break;
            }
            V = prototype;
          }
        }

        if (obj != NULL) {
          // Skip objects that have been filtered out.
          if (filter->Matches(heap_obj)) {
            continue;
          }

          // Valid reference found add to instance array if supplied an update
          // count.
          last_obj = Handle<JSObject>(obj);
          (*total_count)++;

          if (summary != NULL) {
            summary->Add(heap_obj);
          } else if ((*total_count > start) && (index < dump_limit)) {
            count++;
            if (!retainers_arr.is_null()) {
              retainer = Handle<HeapObject>(heap_obj);
              bool success = AddObjDetail(retainers_arr,
                                          index++,
                                          it.Id(),
                                          retainer,
                                          NULL,
                                          id_sym,
                                          desc_sym,
                                          size_sym,
                                          detail,
                                          desc,
                                          error);
              if (!success) return -1;
            }
          }
        }
      }
    }
  }

  // Check for circular reference only. This can happen when the object is only
  // referenced from mirrors and has a circular reference in which case the
  // object is not really alive and would have been garbage collected if not
  // referenced from the mirror.

  if (*total_count == 1 && !last_obj.is_null() && *last_obj == *target) {
    count = 0;
    *total_count = 0;
  }

  return count;
}


MaybeObject* LiveObjectList::GetObjRetainers(int obj_id,
                                             Handle<JSObject> instance_filter,
                                             bool verbose,
                                             int start,
                                             int dump_limit,
                                             Handle<JSObject> filter_obj) {
  HandleScope scope;

  // Get the target object.
  HeapObject* heap_obj = HeapObject::cast(GetObj(obj_id));
  if (heap_obj == Heap::undefined_value()) {
    return heap_obj;
  }

  Handle<HeapObject> target = Handle<HeapObject>(heap_obj);

  // Get the constructor function for context extension and arguments array.
  JSObject* arguments_boilerplate =
      Top::context()->global_context()->arguments_boilerplate();
  JSFunction* arguments_function =
      JSFunction::cast(arguments_boilerplate->map()->constructor());

  Handle<JSFunction> args_function = Handle<JSFunction>(arguments_function);
  LolFilter filter(filter_obj);

  if (!verbose) {
    RetainersSummaryWriter writer(target, instance_filter, args_function);
    return SummarizePrivate(&writer, &filter, true);

  } else {
    RetainersDumpWriter writer(target, instance_filter, args_function);
    Object* body_obj;
    MaybeObject* maybe_result =
        DumpPrivate(&writer, start, dump_limit, &filter);
    if (!maybe_result->ToObject(&body_obj)) {
      return maybe_result;
    }

    // Set body.id.
    Handle<JSObject> body = Handle<JSObject>(JSObject::cast(body_obj));
    Handle<String> id_sym = Factory::LookupAsciiSymbol("id");
1942 1943 1944 1945
    maybe_result = body->SetProperty(*id_sym,
                                     Smi::FromInt(obj_id),
                                     NONE,
                                     kNonStrictMode);
1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584
    if (maybe_result->IsFailure()) return maybe_result;

    return *body;
  }
}


Object* LiveObjectList::PrintObj(int obj_id) {
  Object* obj = GetObj(obj_id);
  if (!obj) {
    return Heap::undefined_value();
  }

  EmbeddedVector<char, 128> temp_filename;
  static int temp_count = 0;
  const char* path_prefix = ".";

  if (FLAG_lol_workdir) {
    path_prefix = FLAG_lol_workdir;
  }
  OS::SNPrintF(temp_filename, "%s/lol-print-%d", path_prefix, ++temp_count);

  FILE* f = OS::FOpen(temp_filename.start(), "w+");

  PrintF(f, "@%d ", LiveObjectList::GetObjId(obj));
#ifdef OBJECT_PRINT
#ifdef INSPECTOR
  Inspector::DumpObjectType(f, obj);
#endif  // INSPECTOR
  PrintF(f, "\n");
  obj->Print(f);
#else  // !OBJECT_PRINT
  obj->ShortPrint(f);
#endif  // !OBJECT_PRINT
  PrintF(f, "\n");
  Flush(f);
  fclose(f);

  // Create a string from the temp_file.
  // Note: the mmapped resource will take care of closing the file.
  MemoryMappedExternalResource* resource =
      new MemoryMappedExternalResource(temp_filename.start(), true);
  if (resource->exists() && !resource->is_empty()) {
    ASSERT(resource->IsAscii());
    Handle<String> dump_string =
        Factory::NewExternalStringFromAscii(resource);
    ExternalStringTable::AddString(*dump_string);
    return *dump_string;
  } else {
    delete resource;
  }
  return Heap::undefined_value();
}


class LolPathTracer: public PathTracer {
 public:
  LolPathTracer(FILE* out,
                Object* search_target,
                WhatToFind what_to_find)
      : PathTracer(search_target, what_to_find, VISIT_ONLY_STRONG), out_(out) {}

 private:
  void ProcessResults();

  FILE* out_;
};


void LolPathTracer::ProcessResults() {
  if (found_target_) {
    PrintF(out_, "=====================================\n");
    PrintF(out_, "====        Path to object       ====\n");
    PrintF(out_, "=====================================\n\n");

    ASSERT(!object_stack_.is_empty());
    Object* prev = NULL;
    for (int i = 0, index = 0; i < object_stack_.length(); i++) {
      Object* obj = object_stack_[i];

      // Skip this object if it is basically the internals of the
      // previous object (which would have dumped its details already).
      if (prev && prev->IsJSObject() &&
          (obj != search_target_)) {
        JSObject* jsobj = JSObject::cast(prev);
        if (obj->IsFixedArray() &&
            jsobj->properties() == FixedArray::cast(obj)) {
          // Skip this one because it would have been printed as the
          // properties of the last object already.
          continue;
        } else if (obj->IsHeapObject() &&
                   jsobj->elements() == HeapObject::cast(obj)) {
          // Skip this one because it would have been printed as the
          // elements of the last object already.
          continue;
        }
      }

      // Print a connecting arrow.
      if (i > 0) PrintF(out_, "\n     |\n     |\n     V\n\n");

      // Print the object index.
      PrintF(out_, "[%d] ", ++index);

      // Print the LOL object ID:
      int id = LiveObjectList::GetObjId(obj);
      if (id > 0) PrintF(out_, "@%d ", id);

#ifdef OBJECT_PRINT
#ifdef INSPECTOR
      Inspector::DumpObjectType(out_, obj);
#endif  // INSPECTOR
      PrintF(out_, "\n");
      obj->Print(out_);
#else  // !OBJECT_PRINT
      obj->ShortPrint(out_);
      PrintF(out_, "\n");
#endif  // !OBJECT_PRINT
      Flush(out_);
    }
    PrintF(out_, "\n");
    PrintF(out_, "=====================================\n\n");
    Flush(out_);
  }
}


Object* LiveObjectList::GetPathPrivate(HeapObject* obj1, HeapObject* obj2) {
  EmbeddedVector<char, 128> temp_filename;
  static int temp_count = 0;
  const char* path_prefix = ".";

  if (FLAG_lol_workdir) {
    path_prefix = FLAG_lol_workdir;
  }
  OS::SNPrintF(temp_filename, "%s/lol-getpath-%d", path_prefix, ++temp_count);

  FILE* f = OS::FOpen(temp_filename.start(), "w+");

  // Save the previous verbosity.
  bool prev_verbosity = FLAG_use_verbose_printer;
  FLAG_use_verbose_printer = false;

  // Dump the paths.
  {
    // The tracer needs to be scoped because its usage asserts no allocation,
    // and we need to allocate the result string below.
    LolPathTracer tracer(f, obj2, LolPathTracer::FIND_FIRST);

    bool found = false;
    if (obj1 == NULL) {
      // Check for ObjectGroups that references this object.
      // TODO(mlam): refactor this to be more modular.
      {
        List<ObjectGroup*>* groups = GlobalHandles::ObjectGroups();
        for (int i = 0; i < groups->length(); i++) {
          ObjectGroup* group = groups->at(i);
          if (group == NULL) continue;

          bool found_group = false;
          List<Object**>& objects = group->objects_;
          for (int j = 0; j < objects.length(); j++) {
            Object* object = *objects[j];
            HeapObject* hobj = HeapObject::cast(object);
            if (obj2 == hobj) {
              found_group = true;
              break;
            }
          }

          if (found_group) {
            PrintF(f,
                   "obj %p is a member of object group %p {\n",
                   reinterpret_cast<void*>(obj2),
                   reinterpret_cast<void*>(group));
            for (int j = 0; j < objects.length(); j++) {
              Object* object = *objects[j];
              if (!object->IsHeapObject()) continue;

              HeapObject* hobj = HeapObject::cast(object);
              int id = GetObjId(hobj);
              if (id != 0) {
                PrintF(f, "  @%d:", id);
              } else {
                PrintF(f, "  <no id>:");
              }

              char buffer[512];
              GenerateObjectDesc(hobj, buffer, sizeof(buffer));
              PrintF(f, " %s", buffer);
              if (hobj == obj2) {
                PrintF(f, " <===");
              }
              PrintF(f, "\n");
            }
            PrintF(f, "}\n");
          }
        }
      }

      PrintF(f, "path from roots to obj %p\n", reinterpret_cast<void*>(obj2));
      Heap::IterateRoots(&tracer, VISIT_ONLY_STRONG);
      found = tracer.found();

      if (!found) {
        PrintF(f, "  No paths found. Checking symbol tables ...\n");
        SymbolTable* symbol_table = Heap::raw_unchecked_symbol_table();
        tracer.VisitPointers(reinterpret_cast<Object**>(&symbol_table),
                             reinterpret_cast<Object**>(&symbol_table)+1);
        found = tracer.found();
        if (!found) {
          symbol_table->IteratePrefix(&tracer);
          found = tracer.found();
        }
      }

      if (!found) {
        PrintF(f, "  No paths found. Checking weak roots ...\n");
        // Check weak refs next.
        GlobalHandles::IterateWeakRoots(&tracer);
        found = tracer.found();
      }

    } else {
      PrintF(f, "path from obj %p to obj %p:\n",
             reinterpret_cast<void*>(obj1), reinterpret_cast<void*>(obj2));
      tracer.TracePathFrom(reinterpret_cast<Object**>(&obj1));
      found = tracer.found();
    }

    if (!found) {
      PrintF(f, "  No paths found\n\n");
    }
  }

  // Flush and clean up the dumped file.
  Flush(f);
  fclose(f);

  // Restore the previous verbosity.
  FLAG_use_verbose_printer = prev_verbosity;

  // Create a string from the temp_file.
  // Note: the mmapped resource will take care of closing the file.
  MemoryMappedExternalResource* resource =
      new MemoryMappedExternalResource(temp_filename.start(), true);
  if (resource->exists() && !resource->is_empty()) {
    ASSERT(resource->IsAscii());
    Handle<String> path_string =
        Factory::NewExternalStringFromAscii(resource);
    ExternalStringTable::AddString(*path_string);
    return *path_string;
  } else {
    delete resource;
  }
  return Heap::undefined_value();
}


Object* LiveObjectList::GetPath(int obj_id1,
                                int obj_id2,
                                Handle<JSObject> instance_filter) {
  HandleScope scope;

  // Get the target object.
  HeapObject* obj1 = NULL;
  if (obj_id1 != 0) {
    obj1 = HeapObject::cast(GetObj(obj_id1));
    if (obj1 == Heap::undefined_value()) {
      return obj1;
    }
  }

  HeapObject* obj2 = HeapObject::cast(GetObj(obj_id2));
  if (obj2 == Heap::undefined_value()) {
    return obj2;
  }

  return GetPathPrivate(obj1, obj2);
}


void LiveObjectList::DoProcessNonLive(HeapObject *obj) {
  // We should only be called if we have at least one lol to search.
  ASSERT(last() != NULL);
  Element* element = last()->Find(obj);
  if (element != NULL) {
    NullifyNonLivePointer(&element->obj_);
  }
}


void LiveObjectList::IterateElementsPrivate(ObjectVisitor* v) {
  LiveObjectList* lol = last();
  while (lol != NULL) {
    Element* elements = lol->elements_;
    int count = lol->obj_count_;
    for (int i = 0; i < count; i++) {
      HeapObject** p = &elements[i].obj_;
      v->VisitPointer(reinterpret_cast<Object **>(p));
    }
    lol = lol->prev_;
  }
}


// Purpose: Called by GCEpilogue to purge duplicates.  Not to be called by
// anyone else.
void LiveObjectList::PurgeDuplicates() {
  bool is_sorted = false;
  LiveObjectList* lol = last();
  if (!lol) {
    return;  // Nothing to purge.
  }

  int total_count = lol->TotalObjCount();
  if (!total_count) {
    return;  // Nothing to purge.
  }

  Element* elements = NewArray<Element>(total_count);
  int count = 0;

  // Copy all the object elements into a consecutive array.
  while (lol) {
    memcpy(&elements[count], lol->elements_, lol->obj_count_ * sizeof(Element));
    count += lol->obj_count_;
    lol = lol->prev_;
  }
  qsort(elements, total_count, sizeof(Element),
        reinterpret_cast<RawComparer>(CompareElement));

  ASSERT(count == total_count);

  // Iterate over all objects in the consolidated list and check for dups.
  total_count--;
  for (int i = 0; i < total_count; ) {
    Element* curr = &elements[i];
    HeapObject* curr_obj = curr->obj_;
    int j = i+1;
    bool done = false;

    while (!done && (j < total_count)) {
      // Process if the element's object is still live after the current GC.
      // Non-live objects will be converted to SMIs i.e. not HeapObjects.
      if (curr_obj->IsHeapObject()) {
        Element* next = &elements[j];
        HeapObject* next_obj = next->obj_;
        if (next_obj->IsHeapObject()) {
          if (curr_obj != next_obj) {
            done = true;
            continue;  // Live object but no match.  Move on.
          }

          // NOTE: we've just GCed the LOLs.  Hence, they are no longer sorted.
          // Since we detected at least one need to search for entries, we'll
          // sort it to enable the use of NullifyMostRecent() below.  We only
          // need to sort it once (except for one exception ... see below).
          if (!is_sorted) {
            SortAll();
            is_sorted = true;
          }

          // We have a match.  Need to nullify the most recent ref to this
          // object.  We'll keep the oldest ref:
          // Note: we will nullify the element record in the LOL
          // database, not in the local sorted copy of the elements.
          NullifyMostRecent(curr_obj);
        }
      }
      // Either the object was already marked for purging, or we just marked
      // it.  Either way, if there's more than one dup, then we need to check
      // the next element for another possible dup against the current as well
      // before we move on.  So, here we go.
      j++;
    }

    // We can move on to checking the match on the next element.
    i = j;
  }

  DeleteArray<Element>(elements);
}


// Purpose: Purges dead objects and resorts the LOLs.
void LiveObjectList::GCEpiloguePrivate() {
  // Note: During the GC, ConsStrings may be collected and pointers may be
  // forwarded to its constituent string.  As a result, we may find dupes of
  // objects references in the LOL list.
  // Another common way we get dups is that free chunks that have been swept
  // in the oldGen heap may be kept as ByteArray objects in a free list.
  //
  // When we promote live objects from the youngGen, the object may be moved
  // to the start of these free chunks.  Since there is no free or move event
  // for the free chunks, their addresses will show up 2 times: once for their
  // original free ByteArray selves, and once for the newly promoted youngGen
  // object.  Hence, we can get a duplicate address in the LOL again.
  //
  // We need to eliminate these dups because the LOL implementation expects to
  // only have at most one unique LOL reference to any object at any time.
  PurgeDuplicates();

  // After the GC, sweep away all free'd Elements and compact.
  LiveObjectList *prev = NULL;
  LiveObjectList *next = NULL;

  // Iterating from the youngest lol to the oldest lol.
  for (LiveObjectList *lol = last(); lol; lol = prev) {
    Element* elements = lol->elements_;
    prev = lol->prev();  // Save the prev.

    // Remove any references to collected objects.
    int i = 0;
    while (i < lol->obj_count_) {
      Element& element = elements[i];
      if (!element.obj_->IsHeapObject()) {
        // If the HeapObject address was converted into a SMI, then this
        // is a dead object.  Copy the last element over this one.
        element = elements[lol->obj_count_ - 1];
        lol->obj_count_--;
        // We've just moved the last element into this index.  We'll revisit
        // this index again.  Hence, no need to increment the iterator.
      } else {
        i++;  // Look at the next element next.
      }
    }

    int new_count = lol->obj_count_;

    // Check if there are any more elements to keep after purging the dead ones.
    if (new_count == 0) {
      DeleteArray<Element>(elements);
      lol->elements_ = NULL;
      lol->capacity_ = 0;
      ASSERT(lol->obj_count_ == 0);

      // If the list is also invisible, the clean up the list as well.
      if (lol->id_ == 0) {
        // Point the next lol's prev to this lol's prev.
        if (next) {
          next->prev_ = lol->prev_;
        } else {
          last_ = lol->prev_;
        }

        // Delete this now empty and invisible lol.
        delete lol;

        // Don't point the next to this lol since it is now deleted.
        // Leave the next pointer pointing to the current lol.
        continue;
      }

    } else {
      // If the obj_count_ is less than the capacity and the difference is
      // greater than a specified threshold, then we should shrink the list.
      int diff = lol->capacity_ - new_count;
      const int kMaxUnusedSpace = 64;
      if (diff > kMaxUnusedSpace) {  // Threshold for shrinking.
        // Shrink the list.
        Element *new_elements = NewArray<Element>(new_count);
        memcpy(new_elements, elements, new_count * sizeof(Element));

        DeleteArray<Element>(elements);
        lol->elements_ = new_elements;
        lol->capacity_ = new_count;
      }
      ASSERT(lol->obj_count_ == new_count);

      lol->Sort();  // We've moved objects.  Re-sort in case.
    }

    // Save the next (for the previous link) in case we need it later.
    next = lol;
  }

#ifdef VERIFY_LOL
  if (FLAG_verify_lol) {
    Verify();
  }
#endif
}


#ifdef VERIFY_LOL
void LiveObjectList::Verify(bool match_heap_exactly) {
  OS::Print("Verifying the LiveObjectList database:\n");

  LiveObjectList* lol = last();
  if (lol == NULL) {
    OS::Print("  No lol database to verify\n");
    return;
  }

  OS::Print("  Preparing the lol database ...\n");
  int total_count = lol->TotalObjCount();

  Element* elements = NewArray<Element>(total_count);
  int count = 0;

  // Copy all the object elements into a consecutive array.
  OS::Print("  Copying the lol database ...\n");
  while (lol != NULL) {
    memcpy(&elements[count], lol->elements_, lol->obj_count_ * sizeof(Element));
    count += lol->obj_count_;
    lol = lol->prev_;
  }
  qsort(elements, total_count, sizeof(Element),
        reinterpret_cast<RawComparer>(CompareElement));

  ASSERT(count == total_count);

  // Iterate over all objects in the heap and check for:
  // 1. object in LOL but not in heap i.e. error.
  // 2. object in heap but not in LOL (possibly not an error).  Usually
  //    just means that we don't have the a capture of the latest heap.
  //    That is unless we did this verify immediately after a capture,
  //    and specified match_heap_exactly = true.

  int number_of_heap_objects = 0;
  int number_of_matches = 0;
  int number_not_in_heap = total_count;
  int number_not_in_lol = 0;

  OS::Print("  Start verify ...\n");
  OS::Print("  Verifying ...");
  Flush();
  HeapIterator iterator(HeapIterator::kFilterFreeListNodes);
  HeapObject* heap_obj = NULL;
  while ((heap_obj = iterator.next()) != NULL) {
    number_of_heap_objects++;

    // Check if the heap_obj is in the lol.
    Element key;
    key.obj_ = heap_obj;

    Element* result = reinterpret_cast<Element*>(
        bsearch(&key, elements, total_count, sizeof(Element),
                reinterpret_cast<RawComparer>(CompareElement)));

    if (result != NULL) {
      number_of_matches++;
      number_not_in_heap--;
      // Mark it as found by changing it into a SMI (mask off low bit).
      // Note: we cannot use HeapObject::cast() here because it asserts that
      // the HeapObject bit is set on the address, but we're unsetting it on
      // purpose here for our marking.
      result->obj_ = reinterpret_cast<HeapObject*>(heap_obj->address());

    } else {
      number_not_in_lol++;
      if (match_heap_exactly) {
        OS::Print("heap object %p NOT in lol database\n", heap_obj);
      }
    }
    // Show some sign of life.
    if (number_of_heap_objects % 1000 == 0) {
      OS::Print(".");
      fflush(stdout);
    }
  }
  OS::Print("\n");

  // Reporting lol objects not found in the heap.
  if (number_not_in_heap) {
    int found = 0;
    for (int i = 0; (i < total_count) && (found < number_not_in_heap); i++) {
      Element& element = elements[i];
      if (element.obj_->IsHeapObject()) {
        OS::Print("lol database object [%d of %d] %p NOT in heap\n",
                  i, total_count, element.obj_);
        found++;
      }
    }
  }

  DeleteArray<Element>(elements);

  OS::Print("number of objects in lol database %d\n", total_count);
  OS::Print("number of heap objects .......... %d\n", number_of_heap_objects);
  OS::Print("number of matches ............... %d\n", number_of_matches);
  OS::Print("number NOT in heap .............. %d\n", number_not_in_heap);
  OS::Print("number NOT in lol database ...... %d\n", number_not_in_lol);

  if (number_of_matches != total_count) {
    OS::Print("  *** ERROR: "
              "NOT all lol database objects match heap objects.\n");
  }
  if (number_not_in_heap != 0) {
    OS::Print("  *** ERROR: %d lol database objects not found in heap.\n",
              number_not_in_heap);
  }
  if (match_heap_exactly) {
    if (!(number_not_in_lol == 0)) {
      OS::Print("  *** ERROR: %d heap objects NOT found in lol database.\n",
                number_not_in_lol);
    }
  }

  ASSERT(number_of_matches == total_count);
  ASSERT(number_not_in_heap == 0);
  ASSERT(number_not_in_lol == (number_of_heap_objects - total_count));
  if (match_heap_exactly) {
    ASSERT(total_count == number_of_heap_objects);
    ASSERT(number_not_in_lol == 0);
  }

  OS::Print("  Verify the lol database is sorted ...\n");
  lol = last();
  while (lol != NULL) {
    Element* elements = lol->elements_;
    for (int i = 0; i < lol->obj_count_ - 1; i++) {
      if (elements[i].obj_ >= elements[i+1].obj_) {
        OS::Print("  *** ERROR: lol %p obj[%d] %p > obj[%d] %p\n",
                  lol, i, elements[i].obj_, i+1, elements[i+1].obj_);
      }
    }
    lol = lol->prev_;
  }

  OS::Print("  DONE verifying.\n\n\n");
}


void LiveObjectList::VerifyNotInFromSpace() {
  OS::Print("VerifyNotInFromSpace() ...\n");
  LolIterator it(NULL, last());
  int i = 0;
  for (it.Init(); !it.Done(); it.Next()) {
    HeapObject* heap_obj = it.Obj();
    if (Heap::InFromSpace(heap_obj)) {
      OS::Print(" ERROR: VerifyNotInFromSpace: [%d] obj %p in From space %p\n",
                i++, heap_obj, Heap::new_space()->FromSpaceLow());
    }
  }
}
#endif  // VERIFY_LOL

2585 2586 2587 2588 2589

} }  // namespace v8::internal

#endif  // LIVE_OBJECT_LIST