v8::internal::RelocIterator Class Reference

#include <assembler.h>

Inheritance diagram for v8::internal::RelocIterator:

Collaboration diagram for v8::internal::RelocIterator:

Public Member Functions
	RelocIterator (Code *code, int mode_mask=-1)
	RelocIterator (const CodeDesc &desc, int mode_mask=-1)
bool	done () const
void	next ()
RelocInfo *	rinfo ()
Public Member Functions inherited from v8::internal::Malloced
void *	operator new (size_t size)
void	operator delete (void *p)

Private Member Functions
void	Advance (int bytes=1)
int	AdvanceGetTag ()
int	GetExtraTag ()
int	GetTopTag ()
void	ReadTaggedPC ()
void	AdvanceReadPC ()
void	AdvanceReadId ()
void	AdvanceReadPoolData ()
void	AdvanceReadPosition ()
void	AdvanceReadData ()
void	AdvanceReadVariableLengthPCJump ()
int	GetLocatableTypeTag ()
void	ReadTaggedId ()
void	ReadTaggedPosition ()
bool	SetMode (RelocInfo::Mode mode)
	DISALLOW_COPY_AND_ASSIGN (RelocIterator)

Private Attributes
byte *	pos_
byte *	end_
byte *	code_age_sequence_
RelocInfo	rinfo_
bool	done_
int	mode_mask_
int	last_id_
int	last_position_

Additional Inherited Members
Static Public Member Functions inherited from v8::internal::Malloced
static void	FatalProcessOutOfMemory ()
static void *	New (size_t size)
static void	Delete (void *p)

Detailed Description

Definition at line 672 of file assembler.h.

Constructor & Destructor Documentation

RelocIterator() [1/2]

v8::internal::RelocIterator::RelocIterator ( Code *  code, int  mode_mask = -1  )

explicit

Definition at line 688 of file assembler.cc.

                                                      {
  rinfo_.host_ = code;
  rinfo_.pc_ = code->instruction_start();
  rinfo_.data_ = 0;
  // Relocation info is read backwards.
  pos_ = code->relocation_start() + code->relocation_size();
  end_ = code->relocation_start();
  done_ = false;
  mode_mask_ = mode_mask;
  last_id_ = 0;
  last_position_ = 0;
  byte* sequence = code->FindCodeAgeSequence();
  // We get the isolate from the map, because at serialization time
  // the code pointer has been cloned and isn't really in heap space.
  Isolate* isolate = code->map()->GetIsolate();
  if (sequence != NULL && !Code::IsYoungSequence(isolate, sequence)) {
    code_age_sequence_ = sequence;
  } else {
    code_age_sequence_ = NULL;
  }
  if (mode_mask_ == 0) pos_ = end_;
  next();
}

References code_age_sequence_, v8::internal::RelocInfo::data_, done_, end_, v8::internal::Code::FindCodeAgeSequence(), v8::internal::HeapObject::GetIsolate(), v8::internal::RelocInfo::host_, v8::internal::Code::instruction_start(), v8::internal::Code::IsYoungSequence(), last_id_, last_position_, v8::internal::HeapObject::map(), mode_mask_, next(), NULL, v8::internal::RelocInfo::pc_, pos_, v8::internal::Code::relocation_size(), v8::internal::Code::relocation_start(), and rinfo_.

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RelocIterator() [2/2]

v8::internal::RelocIterator::RelocIterator ( const CodeDesc &  desc, int  mode_mask = -1  )

explicit

Definition at line 713 of file assembler.cc.

                                                                {
  rinfo_.pc_ = desc.buffer;
  rinfo_.data_ = 0;
  // Relocation info is read backwards.
  pos_ = desc.buffer + desc.buffer_size;
  end_ = pos_ - desc.reloc_size;
  done_ = false;
  mode_mask_ = mode_mask;
  last_id_ = 0;
  last_position_ = 0;
  code_age_sequence_ = NULL;
  if (mode_mask_ == 0) pos_ = end_;
  next();
}

References v8::internal::CodeDesc::buffer, v8::internal::CodeDesc::buffer_size, code_age_sequence_, v8::internal::RelocInfo::data_, done_, end_, last_id_, last_position_, mode_mask_, next(), NULL, v8::internal::RelocInfo::pc_, pos_, v8::internal::CodeDesc::reloc_size, and rinfo_.

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Member Function Documentation

Advance()

void v8::internal::RelocIterator::Advance ( int  bytes = 1 )

inlineprivate

Definition at line 695 of file assembler.h.

{ pos_ -= bytes; }

References pos_.

Referenced by next().

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AdvanceGetTag()

int v8::internal::RelocIterator::AdvanceGetTag ( )

inlineprivate

Definition at line 481 of file assembler.cc.

                                        {
  return *--pos_ & kTagMask;
}

References v8::internal::kTagMask, and pos_.

Referenced by next().

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AdvanceReadData()

void v8::internal::RelocIterator::AdvanceReadData ( )

private

Definition at line 535 of file assembler.cc.

                                    {
  intptr_t x = 0;
  for (int i = 0; i < kIntptrSize; i++) {
    x |= static_cast<intptr_t>(*--pos_) << i * kBitsPerByte;
  }
  rinfo_.data_ = x;
}

References v8::internal::RelocInfo::data_, v8::internal::kBitsPerByte, v8::internal::kIntptrSize, pos_, and rinfo_.

Referenced by next().

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AdvanceReadId()

void v8::internal::RelocIterator::AdvanceReadId ( )

private

Definition at line 506 of file assembler.cc.

                                  {
  int x = 0;
  for (int i = 0; i < kIntSize; i++) {
    x |= static_cast<int>(*--pos_) << i * kBitsPerByte;
  }
  last_id_ += x;
  rinfo_.data_ = last_id_;
}

References v8::internal::RelocInfo::data_, v8::internal::kBitsPerByte, v8::internal::kIntSize, last_id_, pos_, and rinfo_.

Referenced by next().

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AdvanceReadPC()

void v8::internal::RelocIterator::AdvanceReadPC ( )

inlineprivate

Definition at line 501 of file assembler.cc.

                                         {
  rinfo_.pc_ += *--pos_;
}

References v8::internal::RelocInfo::pc_, pos_, and rinfo_.

Referenced by next().

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AdvanceReadPoolData()

void v8::internal::RelocIterator::AdvanceReadPoolData ( )

private

Definition at line 516 of file assembler.cc.

                                        {
  int x = 0;
  for (int i = 0; i < kIntSize; i++) {
    x |= static_cast<int>(*--pos_) << i * kBitsPerByte;
  }
  rinfo_.data_ = x;
}

References v8::internal::RelocInfo::data_, v8::internal::kBitsPerByte, v8::internal::kIntSize, pos_, and rinfo_.

Referenced by next().

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AdvanceReadPosition()

void v8::internal::RelocIterator::AdvanceReadPosition ( )

private

Definition at line 525 of file assembler.cc.

                                        {
  int x = 0;
  for (int i = 0; i < kIntSize; i++) {
    x |= static_cast<int>(*--pos_) << i * kBitsPerByte;
  }
  last_position_ += x;
  rinfo_.data_ = last_position_;
}

References v8::internal::RelocInfo::data_, v8::internal::kBitsPerByte, v8::internal::kIntSize, last_position_, pos_, and rinfo_.

Referenced by next().

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AdvanceReadVariableLengthPCJump()

void v8::internal::RelocIterator::AdvanceReadVariableLengthPCJump ( )

private

Definition at line 544 of file assembler.cc.

                                                    {
  // Read the 32-kSmallPCDeltaBits most significant bits of the
  // pc jump in kChunkBits bit chunks and shift them into place.
  // Stop when the last chunk is encountered.
  uint32_t pc_jump = 0;
  for (int i = 0; i < kIntSize; i++) {
    byte pc_jump_part = *--pos_;
    pc_jump |= (pc_jump_part >> kLastChunkTagBits) << i * kChunkBits;
    if ((pc_jump_part & kLastChunkTagMask) == 1) break;
  }
  // The least significant kSmallPCDeltaBits bits will be added
  // later.
  rinfo_.pc_ += pc_jump << kSmallPCDeltaBits;
}

References v8::internal::kChunkBits, v8::internal::kIntSize, v8::internal::kLastChunkTagBits, v8::internal::kLastChunkTagMask, v8::internal::kSmallPCDeltaBits, v8::internal::RelocInfo::pc_, pos_, and rinfo_.

Referenced by next().

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DISALLOW_COPY_AND_ASSIGN()

v8::internal::RelocIterator::DISALLOW_COPY_AND_ASSIGN ( RelocIterator  )

private

done()

bool v8::internal::RelocIterator::done ( ) const

inline

Definition at line 682 of file assembler.h.

{ return done_; }

References done_.

Referenced by v8::internal::Code::ClearInlineCaches(), v8::internal::Code::CodeIterateBody(), v8::internal::ComputeCodeOffsetFromPcOffset(), v8::internal::ComputePcOffsetFromCodeOffset(), v8::internal::Code::CopyFrom(), v8::internal::Code::FindAllMaps(), v8::internal::Code::FindAndReplace(), v8::internal::Code::FindFirstHandler(), v8::internal::Code::FindFirstName(), v8::internal::Code::FindHandlerForMap(), v8::internal::Code::FindHandlers(), v8::internal::Code::FindNthObject(), v8::internal::TypeFeedbackOracle::GetRelocInfos(), v8::internal::Code::InvalidateEmbeddedObjects(), v8::internal::IC::InvalidateMaps(), v8::internal::Debug::IsBreakAtReturn(), next(), v8::internal::PatchPositionsInCode(), v8::internal::Code::PrintDeoptLocation(), v8::internal::Code::Relocate(), v8::internal::LiveEdit::ReplaceRefToNestedFunction(), rinfo(), v8::internal::BreakLocationIterator::RinfoDone(), v8::internal::BreakLocationIterator::RinfoNext(), v8::internal::RUNTIME_FUNCTION(), v8::internal::compiler::SearchSharedFunctionInfo(), v8::internal::Debug::SetAfterBreakTarget(), v8::internal::Code::SourcePosition(), v8::internal::Code::SourceStatementPosition(), and v8::internal::WipeOutRelocations().

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GetExtraTag()

int v8::internal::RelocIterator::GetExtraTag ( )

inlineprivate

Definition at line 486 of file assembler.cc.

                                      {
  return (*pos_ >> kTagBits) & ((1 << kExtraTagBits) - 1);
}

References v8::internal::kExtraTagBits, v8::internal::kTagBits, and pos_.

Referenced by next().

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GetLocatableTypeTag()

int v8::internal::RelocIterator::GetLocatableTypeTag ( )

inlineprivate

Definition at line 560 of file assembler.cc.

                                              {
  return *pos_ & ((1 << kLocatableTypeTagBits) - 1);
}

References v8::internal::kLocatableTypeTagBits, and pos_.

Referenced by next().

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GetTopTag()

int v8::internal::RelocIterator::GetTopTag ( )

inlineprivate

Definition at line 491 of file assembler.cc.

                                    {
  return *pos_ >> (kTagBits + kExtraTagBits);
}

References v8::internal::kExtraTagBits, v8::internal::kTagBits, and pos_.

Referenced by next().

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next()

void v8::internal::RelocIterator::next

(

)

Definition at line 590 of file assembler.cc.

                         {
  DCHECK(!done());
  // Basically, do the opposite of RelocInfoWriter::Write.
  // Reading of data is as far as possible avoided for unwanted modes,
  // but we must always update the pc.
  //
  // We exit this loop by returning when we find a mode we want.
  while (pos_ > end_) {
    int tag = AdvanceGetTag();
    if (tag == kEmbeddedObjectTag) {
      ReadTaggedPC();
      if (SetMode(RelocInfo::EMBEDDED_OBJECT)) return;
    } else if (tag == kCodeTargetTag) {
      ReadTaggedPC();
      if (SetMode(RelocInfo::CODE_TARGET)) return;
    } else if (tag == kLocatableTag) {
      ReadTaggedPC();
      Advance();
      int locatable_tag = GetLocatableTypeTag();
      if (locatable_tag == kCodeWithIdTag) {
        if (SetMode(RelocInfo::CODE_TARGET_WITH_ID)) {
          ReadTaggedId();
          return;
        }
      } else {
        // Compact encoding is never used for comments,
        // so it must be a position.
        DCHECK(locatable_tag == kNonstatementPositionTag ||
               locatable_tag == kStatementPositionTag);
        if (mode_mask_ & RelocInfo::kPositionMask) {
          ReadTaggedPosition();
          if (SetMode(GetPositionModeFromTag(locatable_tag))) return;
        }
      }
    } else {
      DCHECK(tag == kDefaultTag);
      int extra_tag = GetExtraTag();
      if (extra_tag == kPCJumpExtraTag) {
        if (GetTopTag() == kVariableLengthPCJumpTopTag) {
          AdvanceReadVariableLengthPCJump();
        } else {
          AdvanceReadPC();
        }
      } else if (extra_tag == kDataJumpExtraTag) {
        int locatable_tag = GetTopTag();
        if (locatable_tag == kCodeWithIdTag) {
          if (SetMode(RelocInfo::CODE_TARGET_WITH_ID)) {
            AdvanceReadId();
            return;
          }
          Advance(kIntSize);
        } else if (locatable_tag != kCommentTag) {
          DCHECK(locatable_tag == kNonstatementPositionTag ||
                 locatable_tag == kStatementPositionTag);
          if (mode_mask_ & RelocInfo::kPositionMask) {
            AdvanceReadPosition();
            if (SetMode(GetPositionModeFromTag(locatable_tag))) return;
          } else {
            Advance(kIntSize);
          }
        } else {
          DCHECK(locatable_tag == kCommentTag);
          if (SetMode(RelocInfo::COMMENT)) {
            AdvanceReadData();
            return;
          }
          Advance(kIntptrSize);
        }
      } else if (extra_tag == kPoolExtraTag) {
        int pool_type = GetTopTag();
        DCHECK(pool_type == kConstPoolTag || pool_type == kVeneerPoolTag);
        RelocInfo::Mode rmode = (pool_type == kConstPoolTag) ?
          RelocInfo::CONST_POOL : RelocInfo::VENEER_POOL;
        if (SetMode(rmode)) {
          AdvanceReadPoolData();
          return;
        }
        Advance(kIntSize);
      } else {
        AdvanceReadPC();
        int rmode = extra_tag + RelocInfo::LAST_COMPACT_ENUM;
        if (SetMode(static_cast<RelocInfo::Mode>(rmode))) return;
      }
    }
  }
  if (code_age_sequence_ != NULL) {
    byte* old_code_age_sequence = code_age_sequence_;
    code_age_sequence_ = NULL;
    if (SetMode(RelocInfo::CODE_AGE_SEQUENCE)) {
      rinfo_.data_ = 0;
      rinfo_.pc_ = old_code_age_sequence;
      return;
    }
  }
  done_ = true;
}

References Advance(), AdvanceGetTag(), AdvanceReadData(), AdvanceReadId(), AdvanceReadPC(), AdvanceReadPoolData(), AdvanceReadPosition(), AdvanceReadVariableLengthPCJump(), v8::internal::RelocInfo::CODE_AGE_SEQUENCE, code_age_sequence_, v8::internal::RelocInfo::CODE_TARGET, v8::internal::RelocInfo::CODE_TARGET_WITH_ID, v8::internal::RelocInfo::COMMENT, v8::internal::RelocInfo::CONST_POOL, v8::internal::RelocInfo::data_, DCHECK, done(), done_, v8::internal::RelocInfo::EMBEDDED_OBJECT, end_, GetExtraTag(), GetLocatableTypeTag(), v8::internal::GetPositionModeFromTag(), GetTopTag(), v8::internal::kCodeTargetTag, v8::internal::kCodeWithIdTag, v8::internal::kCommentTag, v8::internal::kConstPoolTag, v8::internal::kDataJumpExtraTag, v8::internal::kDefaultTag, v8::internal::kEmbeddedObjectTag, v8::internal::kIntptrSize, v8::internal::kIntSize, v8::internal::kLocatableTag, v8::internal::kNonstatementPositionTag, v8::internal::kPCJumpExtraTag, v8::internal::kPoolExtraTag, v8::internal::RelocInfo::kPositionMask, v8::internal::kStatementPositionTag, v8::internal::kVariableLengthPCJumpTopTag, v8::internal::kVeneerPoolTag, v8::internal::RelocInfo::LAST_COMPACT_ENUM, mode_mask_, NULL, v8::internal::RelocInfo::pc_, pos_, ReadTaggedId(), ReadTaggedPC(), ReadTaggedPosition(), rinfo_, SetMode(), and v8::internal::RelocInfo::VENEER_POOL.

Referenced by v8::internal::Code::CodeIterateBody(), v8::internal::Debug::IsBreakAtReturn(), RelocIterator(), v8::internal::BreakLocationIterator::RinfoNext(), v8::internal::RUNTIME_FUNCTION(), v8::internal::Debug::SetAfterBreakTarget(), v8::internal::Code::SourcePosition(), and v8::internal::Code::SourceStatementPosition().

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ReadTaggedId()

void v8::internal::RelocIterator::ReadTaggedId ( )

inlineprivate

Definition at line 565 of file assembler.cc.

                                        {
  int8_t signed_b = *pos_;
  // Signed right shift is arithmetic shift.  Tested in test-utils.cc.
  last_id_ += signed_b >> kLocatableTypeTagBits;
  rinfo_.data_ = last_id_;
}

References v8::internal::RelocInfo::data_, v8::internal::kLocatableTypeTagBits, last_id_, pos_, and rinfo_.

Referenced by next().

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ReadTaggedPC()

void v8::internal::RelocIterator::ReadTaggedPC ( )

inlineprivate

Definition at line 496 of file assembler.cc.

                                        {
  rinfo_.pc_ += *pos_ >> kTagBits;
}

References v8::internal::kTagBits, v8::internal::RelocInfo::pc_, pos_, and rinfo_.

Referenced by next().

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ReadTaggedPosition()

void v8::internal::RelocIterator::ReadTaggedPosition ( )

inlineprivate

Definition at line 573 of file assembler.cc.

                                              {
  int8_t signed_b = *pos_;
  // Signed right shift is arithmetic shift.  Tested in test-utils.cc.
  last_position_ += signed_b >> kLocatableTypeTagBits;
  rinfo_.data_ = last_position_;
}

References v8::internal::RelocInfo::data_, v8::internal::kLocatableTypeTagBits, last_position_, pos_, and rinfo_.

Referenced by next().

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rinfo()

RelocInfo* v8::internal::RelocIterator::rinfo ( )

inline

Definition at line 686 of file assembler.h.

                     {
    DCHECK(!done());
    return &rinfo_;
  }

References DCHECK, done(), and rinfo_.

Referenced by v8::internal::Code::CodeIterateBody(), v8::internal::Debug::IsBreakAtReturn(), v8::internal::BreakLocationIterator::original_rinfo(), v8::internal::BreakLocationIterator::original_rmode(), v8::internal::BreakLocationIterator::pc(), v8::internal::BreakLocationIterator::rinfo(), v8::internal::BreakLocationIterator::rmode(), v8::internal::RUNTIME_FUNCTION(), v8::internal::Debug::SetAfterBreakTarget(), v8::internal::Code::SourcePosition(), and v8::internal::Code::SourceStatementPosition().

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SetMode()

bool v8::internal::RelocIterator::SetMode ( RelocInfo::Mode  mode )

inlineprivate

Definition at line 712 of file assembler.h.

                                   {
    return (mode_mask_ & (1 << mode)) ? (rinfo_.rmode_ = mode, true) : false;
  }

References mode(), mode_mask_, rinfo_, and v8::internal::RelocInfo::rmode_.

Referenced by next().

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Member Data Documentation

code_age_sequence_

byte* v8::internal::RelocIterator::code_age_sequence_

private

Definition at line 718 of file assembler.h.

Referenced by next(), and RelocIterator().

done_

bool v8::internal::RelocIterator::done_

private

Definition at line 720 of file assembler.h.

Referenced by done(), next(), and RelocIterator().

end_

byte* v8::internal::RelocIterator::end_

private

Definition at line 717 of file assembler.h.

Referenced by next(), and RelocIterator().

last_id_

int v8::internal::RelocIterator::last_id_

private

Definition at line 722 of file assembler.h.

Referenced by AdvanceReadId(), ReadTaggedId(), and RelocIterator().

last_position_

int v8::internal::RelocIterator::last_position_

private

Definition at line 723 of file assembler.h.

Referenced by AdvanceReadPosition(), ReadTaggedPosition(), and RelocIterator().

mode_mask_

int v8::internal::RelocIterator::mode_mask_

private

Definition at line 721 of file assembler.h.

Referenced by next(), RelocIterator(), and SetMode().

pos_

byte* v8::internal::RelocIterator::pos_

private

Definition at line 716 of file assembler.h.

Referenced by Advance(), AdvanceGetTag(), AdvanceReadData(), AdvanceReadId(), AdvanceReadPC(), AdvanceReadPoolData(), AdvanceReadPosition(), AdvanceReadVariableLengthPCJump(), GetExtraTag(), GetLocatableTypeTag(), GetTopTag(), next(), ReadTaggedId(), ReadTaggedPC(), ReadTaggedPosition(), and RelocIterator().

rinfo_

RelocInfo v8::internal::RelocIterator::rinfo_

private

Definition at line 719 of file assembler.h.

Referenced by AdvanceReadData(), AdvanceReadId(), AdvanceReadPC(), AdvanceReadPoolData(), AdvanceReadPosition(), AdvanceReadVariableLengthPCJump(), next(), ReadTaggedId(), ReadTaggedPC(), ReadTaggedPosition(), RelocIterator(), rinfo(), and SetMode().

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The documentation for this class was generated from the following files:

• /mnt/V8SourceCode/src/assembler.h
• /mnt/V8SourceCode/src/assembler.cc