Revert of Refactor compilation dependency handling.

src/compilation-dependencies.cc

-// Copyright 2015 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.
-
-#include "src/factory.h"
-#include "src/handles-inl.h"
-#include "src/isolate.h"
-#include "src/objects-inl.h"
-#include "src/zone.h"
-
-#include "src/compilation-dependencies.h"
-
-namespace v8 {
-namespace internal {
-
-DependentCode* CompilationDependencies::Get(Handle<Object> object) {
-  if (object->IsMap()) {
-    return Handle<Map>::cast(object)->dependent_code();
-  } else if (object->IsPropertyCell()) {
-    return Handle<PropertyCell>::cast(object)->dependent_code();
-  } else if (object->IsAllocationSite()) {
-    return Handle<AllocationSite>::cast(object)->dependent_code();
-  }
-  UNREACHABLE();
-  return nullptr;
-}
-
-
-void CompilationDependencies::Set(Handle<Object> object,
-                                  Handle<DependentCode> dep) {
-  if (object->IsMap()) {
-    Handle<Map>::cast(object)->set_dependent_code(*dep);
-  } else if (object->IsPropertyCell()) {
-    Handle<PropertyCell>::cast(object)->set_dependent_code(*dep);
-  } else if (object->IsAllocationSite()) {
-    Handle<AllocationSite>::cast(object)->set_dependent_code(*dep);
-  } else {
-    UNREACHABLE();
-  }
-}
-
-
-void CompilationDependencies::Insert(DependentCode::DependencyGroup group,
-                                     Handle<HeapObject> object) {
-  if (groups_[group] == nullptr) {
-    groups_[group] = new (zone_) ZoneList<Handle<HeapObject>>(2, zone_);
-  }
-  groups_[group]->Add(object, zone_);
-
-  if (object_wrapper_.is_null()) {
-    // Allocate the wrapper if necessary.
-    object_wrapper_ =
-        isolate_->factory()->NewForeign(reinterpret_cast<Address>(this));
-  }
-
-  // Get the old dependent code list.
-  Handle<DependentCode> old_dependent_code =
-      Handle<DependentCode>(Get(object), isolate_);
-  Handle<DependentCode> new_dependent_code =
-      DependentCode::InsertCompilationDependencies(old_dependent_code, group,
-                                                   object_wrapper_);
-
-  // Set the new dependent code list if the head of the list changed.
-  if (!new_dependent_code.is_identical_to(old_dependent_code)) {
-    Set(object, new_dependent_code);
-  }
-}
-
-
-void CompilationDependencies::Commit(Handle<Code> code) {
-  if (IsEmpty()) return;
-
-  DCHECK(!object_wrapper_.is_null());
-  Handle<WeakCell> cell = Code::WeakCellFor(code);
-  AllowDeferredHandleDereference get_wrapper;
-  for (int i = 0; i < DependentCode::kGroupCount; i++) {
-    ZoneList<Handle<HeapObject>>* group_objects = groups_[i];
-    if (group_objects == nullptr) continue;
-    DependentCode::DependencyGroup group =
-        static_cast<DependentCode::DependencyGroup>(i);
-    for (int j = 0; j < group_objects->length(); j++) {
-      DependentCode* dependent_code = Get(group_objects->at(j));
-      dependent_code->UpdateToFinishedCode(group, *object_wrapper_, *cell);
-    }
-    groups_[i] = nullptr;  // Zone-allocated, no need to delete.
-  }
-}
-
-
-void CompilationDependencies::Rollback() {
-  if (IsEmpty()) return;
-
-  AllowDeferredHandleDereference get_wrapper;
-  // Unregister from all dependent maps if not yet committed.
-  for (int i = 0; i < DependentCode::kGroupCount; i++) {
-    ZoneList<Handle<HeapObject>>* group_objects = groups_[i];
-    if (group_objects == nullptr) continue;
-    DependentCode::DependencyGroup group =
-        static_cast<DependentCode::DependencyGroup>(i);
-    for (int j = 0; j < group_objects->length(); j++) {
-      DependentCode* dependent_code = Get(group_objects->at(j));
-      dependent_code->RemoveCompilationDependencies(group, *object_wrapper_);
-    }
-    groups_[i] = nullptr;  // Zone-allocated, no need to delete.
-  }
-}
-
-
-void CompilationDependencies::AssumeTransitionStable(
-    Handle<AllocationSite> site) {
-  // Do nothing if the object doesn't have any useful element transitions left.
-  ElementsKind kind =
-      site->SitePointsToLiteral()
-          ? JSObject::cast(site->transition_info())->GetElementsKind()
-          : site->GetElementsKind();
-  if (AllocationSite::GetMode(kind) == TRACK_ALLOCATION_SITE) {
-    Insert(DependentCode::kAllocationSiteTransitionChangedGroup, site);
-  }
-}
-}
-}  // namespace v8::internal