dart::ObjectOffsetTrait Class Reference

#include <image_snapshot.h>

Public Types
typedef ObjectPtr	Key
typedef int32_t	Value
typedef ObjectOffsetPair	Pair

Static Public Member Functions
static Key	KeyOf (Pair kv)
static Value	ValueOf (Pair kv)
static uword	Hash (Key key)
static bool	IsKeyEqual (Pair pair, Key key)

Detailed Description

Definition at line 179 of file image_snapshot.h.

Member Typedef Documentation

Key

typedef ObjectPtr dart::ObjectOffsetTrait::Key

Definition at line 182 of file image_snapshot.h.

Pair

typedef ObjectOffsetPair dart::ObjectOffsetTrait::Pair

Definition at line 184 of file image_snapshot.h.

Value

typedef int32_t dart::ObjectOffsetTrait::Value

Definition at line 183 of file image_snapshot.h.

Member Function Documentation

Hash()

uword dart::ObjectOffsetTrait::Hash ( Key  key )

static

Definition at line 127 of file image_snapshot.cc.

                                     {
  ObjectPtr obj = key;
  ASSERT(!obj->IsSmi());
 
  uword body = UntaggedObject::ToAddr(obj) + sizeof(UntaggedObject);
  uword end = UntaggedObject::ToAddr(obj) + obj->untag()->HeapSize();
 
  uint32_t hash = obj->GetClassId();
  // Don't include the header. Objects in the image are pre-marked, but objects
  // in the current isolate are not.
  for (uword cursor = body; cursor < end; cursor += sizeof(uint32_t)) {
    hash = CombineHashes(hash, *reinterpret_cast<uint32_t*>(cursor));
  }
 
  return FinalizeHash(hash, 30);
}

IsKeyEqual()

bool dart::ObjectOffsetTrait::IsKeyEqual ( Pair  pair, Key  key  )

inlinestatic

Definition at line 144 of file image_snapshot.cc.

                                                     {
  ObjectPtr a = pair.object;
  ObjectPtr b = key;
  ASSERT(!a->IsSmi());
  ASSERT(!b->IsSmi());
 
  if (a->GetClassId() != b->GetClassId()) {
    return false;
  }
 
  intptr_t heap_size = a->untag()->HeapSize();
  if (b->untag()->HeapSize() != heap_size) {
    return false;
  }
 
  // Don't include the header. Objects in the image are pre-marked, but objects
  // in the current isolate are not.
  uword body_a = UntaggedObject::ToAddr(a) + sizeof(UntaggedObject);
  uword body_b = UntaggedObject::ToAddr(b) + sizeof(UntaggedObject);
  uword body_size = heap_size - sizeof(UntaggedObject);
  return 0 == memcmp(reinterpret_cast<const void*>(body_a),
                     reinterpret_cast<const void*>(body_b), body_size);
}

KeyOf()

static Key dart::ObjectOffsetTrait::KeyOf ( Pair  kv )

inlinestatic

Definition at line 186 of file image_snapshot.h.

{ return kv.object; }

ValueOf()

static Value dart::ObjectOffsetTrait::ValueOf ( Pair  kv )

inlinestatic

Definition at line 187 of file image_snapshot.h.

{ return kv.offset; }

---

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

• third_party/dart-lang/sdk/runtime/vm/image_snapshot.h
• third_party/dart-lang/sdk/runtime/vm/image_snapshot.cc