src/v8/src/heap/objects-visiting-inl.h

// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_OBJECTS_VISITING_INL_H_
#define V8_OBJECTS_VISITING_INL_H_

#include "src/heap/objects-visiting.h"

#include "src/heap/array-buffer-tracker.h"
#include "src/heap/embedder-tracing.h"
#include "src/heap/mark-compact.h"
#include "src/macro-assembler.h"
#include "src/objects-body-descriptors-inl.h"

namespace v8 {
namespace internal {

template <typename ResultType, typename ConcreteVisitor>
template <typename T>
T* HeapVisitor<ResultType, ConcreteVisitor>::Cast(HeapObject* object) {
  return T::cast(object);
}

template <typename ResultType, typename ConcreteVisitor>
ResultType HeapVisitor<ResultType, ConcreteVisitor>::Visit(HeapObject* object) {
  return Visit(object->map(), object);
}

template <typename ResultType, typename ConcreteVisitor>
ResultType HeapVisitor<ResultType, ConcreteVisitor>::Visit(Map* map,
                                                           HeapObject* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  switch (map->visitor_id()) {
#define CASE(type)                   \
  case kVisit##type:                 \
    return visitor->Visit##type(map, \
                                ConcreteVisitor::template Cast<type>(object));
    TYPED_VISITOR_ID_LIST(CASE)
#undef CASE
    case kVisitShortcutCandidate:
      return visitor->VisitShortcutCandidate(
          map, ConcreteVisitor::template Cast<ConsString>(object));
    case kVisitNativeContext:
      return visitor->VisitNativeContext(
          map, ConcreteVisitor::template Cast<Context>(object));
    case kVisitDataObject:
      return visitor->VisitDataObject(map, object);
    case kVisitJSObjectFast:
      return visitor->VisitJSObjectFast(
          map, ConcreteVisitor::template Cast<JSObject>(object));
    case kVisitJSApiObject:
      return visitor->VisitJSApiObject(
          map, ConcreteVisitor::template Cast<JSObject>(object));
    case kVisitStruct:
      return visitor->VisitStruct(map, object);
    case kVisitFreeSpace:
      return visitor->VisitFreeSpace(map, FreeSpace::cast(object));
    case kVisitorIdCount:
      UNREACHABLE();
  }
  UNREACHABLE();
  // Make the compiler happy.
  return ResultType();
}

template <typename ResultType, typename ConcreteVisitor>
void HeapVisitor<ResultType, ConcreteVisitor>::VisitMapPointer(
    HeapObject* host, HeapObject** map) {
  static_cast<ConcreteVisitor*>(this)->VisitPointer(
      host, reinterpret_cast<Object**>(map));
}

#define VISIT(type)                                                 \
  template <typename ResultType, typename ConcreteVisitor>          \
  ResultType HeapVisitor<ResultType, ConcreteVisitor>::Visit##type( \
      Map* map, type* object) {                                     \
    ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this); \
    if (!visitor->ShouldVisit(object)) return ResultType();         \
    int size = type::BodyDescriptor::SizeOf(map, object);           \
    if (visitor->ShouldVisitMapPointer())                           \
      visitor->VisitMapPointer(object, object->map_slot());         \
    type::BodyDescriptor::IterateBody(object, size, visitor);       \
    return static_cast<ResultType>(size);                           \
  }
TYPED_VISITOR_ID_LIST(VISIT)
#undef VISIT

template <typename ResultType, typename ConcreteVisitor>
ResultType HeapVisitor<ResultType, ConcreteVisitor>::VisitShortcutCandidate(
    Map* map, ConsString* object) {
  return static_cast<ConcreteVisitor*>(this)->VisitConsString(map, object);
}

template <typename ResultType, typename ConcreteVisitor>
ResultType HeapVisitor<ResultType, ConcreteVisitor>::VisitNativeContext(
    Map* map, Context* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  if (!visitor->ShouldVisit(object)) return ResultType();
  int size = Context::BodyDescriptor::SizeOf(map, object);
  if (visitor->ShouldVisitMapPointer())
    visitor->VisitMapPointer(object, object->map_slot());
  Context::BodyDescriptor::IterateBody(object, size, visitor);
  return static_cast<ResultType>(size);
}

template <typename ResultType, typename ConcreteVisitor>
ResultType HeapVisitor<ResultType, ConcreteVisitor>::VisitDataObject(
    Map* map, HeapObject* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  if (!visitor->ShouldVisit(object)) return ResultType();
  int size = map->instance_size();
  if (visitor->ShouldVisitMapPointer())
    visitor->VisitMapPointer(object, object->map_slot());
  return static_cast<ResultType>(size);
}

template <typename ResultType, typename ConcreteVisitor>
ResultType HeapVisitor<ResultType, ConcreteVisitor>::VisitJSObjectFast(
    Map* map, JSObject* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  if (!visitor->ShouldVisit(object)) return ResultType();
  int size = JSObject::FastBodyDescriptor::SizeOf(map, object);
  if (visitor->ShouldVisitMapPointer())
    visitor->VisitMapPointer(object, object->map_slot());
  JSObject::FastBodyDescriptor::IterateBody(object, size, visitor);
  return static_cast<ResultType>(size);
}

template <typename ResultType, typename ConcreteVisitor>
ResultType HeapVisitor<ResultType, ConcreteVisitor>::VisitJSApiObject(
    Map* map, JSObject* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  if (!visitor->ShouldVisit(object)) return ResultType();
  int size = JSObject::BodyDescriptor::SizeOf(map, object);
  if (visitor->ShouldVisitMapPointer())
    visitor->VisitMapPointer(object, object->map_slot());
  JSObject::BodyDescriptor::IterateBody(object, size, visitor);
  return static_cast<ResultType>(size);
}

template <typename ResultType, typename ConcreteVisitor>
ResultType HeapVisitor<ResultType, ConcreteVisitor>::VisitStruct(
    Map* map, HeapObject* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  if (!visitor->ShouldVisit(object)) return ResultType();
  int size = map->instance_size();
  if (visitor->ShouldVisitMapPointer())
    visitor->VisitMapPointer(object, object->map_slot());
  StructBodyDescriptor::IterateBody(object, size, visitor);
  return static_cast<ResultType>(size);
}

template <typename ResultType, typename ConcreteVisitor>
ResultType HeapVisitor<ResultType, ConcreteVisitor>::VisitFreeSpace(
    Map* map, FreeSpace* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  if (!visitor->ShouldVisit(object)) return ResultType();
  if (visitor->ShouldVisitMapPointer())
    visitor->VisitMapPointer(object, object->map_slot());
  return static_cast<ResultType>(FreeSpace::cast(object)->size());
}

template <typename ConcreteVisitor>
int NewSpaceVisitor<ConcreteVisitor>::VisitJSFunction(Map* map,
                                                      JSFunction* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  int size = JSFunction::BodyDescriptorWeak::SizeOf(map, object);
  JSFunction::BodyDescriptorWeak::IterateBody(object, size, visitor);
  return size;
}

template <typename ConcreteVisitor>
int NewSpaceVisitor<ConcreteVisitor>::VisitNativeContext(Map* map,
                                                         Context* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  int size = Context::BodyDescriptor::SizeOf(map, object);
  Context::BodyDescriptor::IterateBody(object, size, visitor);
  return size;
}

template <typename ConcreteVisitor>
int NewSpaceVisitor<ConcreteVisitor>::VisitJSApiObject(Map* map,
                                                       JSObject* object) {
  ConcreteVisitor* visitor = static_cast<ConcreteVisitor*>(this);
  return visitor->VisitJSObject(map, object);
}

}  // namespace internal
}  // namespace v8

#endif  // V8_OBJECTS_VISITING_INL_H_