Reland "Clean up DependentCode class."

This is a reland of 1ba5d5ba76
without any changes.

TBR=jarin@chromium.org

Original change's description:
> Clean up DependentCode class.
>
> Also move some helpers there.
>
> Bug: v8:7902
> Change-Id: I1ef3d1e8317102afae2861382e9ba60b0ef6bba4
> Reviewed-on: https://chromium-review.googlesource.com/1121461
> Commit-Queue: Georg Neis <neis@chromium.org>
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54179}

Bug: v8:7902
Change-Id: I9ef70b88be1b31b458a95442ff3806d651e809ee
Reviewed-on: https://chromium-review.googlesource.com/1127719
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54289}

src/objects.cc

@@ -14953,32 +14953,17 @@ void JSArray::SetLength(Handle<JSArray> array, uint32_t new_length) {
   array->GetElementsAccessor()->SetLength(array, new_length);
 }
 
-
-Handle<DependentCode> DependentCode::InsertCompilationDependencies(
-    Handle<DependentCode> entries, DependencyGroup group,
-    Handle<Foreign> info) {
-  return Insert(entries, group, info);
-}
-
-
 Handle<DependentCode> DependentCode::InsertWeakCode(
     Handle<DependentCode> entries, DependencyGroup group,
     Handle<WeakCell> code_cell) {
-  return Insert(entries, group, code_cell);
-}
-
-
-Handle<DependentCode> DependentCode::Insert(Handle<DependentCode> entries,
-                                            DependencyGroup group,
-                                            Handle<Object> object) {
   if (entries->length() == 0 || entries->group() > group) {
     // There is no such group.
-    return DependentCode::New(group, object, entries);
+    return DependentCode::New(group, code_cell, entries);
   }
   if (entries->group() < group) {
     // The group comes later in the list.
     Handle<DependentCode> old_next(entries->next_link(), entries->GetIsolate());
-    Handle<DependentCode> new_next = Insert(old_next, group, object);
+    Handle<DependentCode> new_next = InsertWeakCode(old_next, group, code_cell);
     if (!old_next.is_identical_to(new_next)) {
       entries->set_next_link(*new_next);
     }
@@ -14988,14 +14973,14 @@ Handle<DependentCode> DependentCode::Insert(Handle<DependentCode> entries,
   int count = entries->count();
   // Check for existing entry to avoid duplicates.
   for (int i = 0; i < count; i++) {
-    if (entries->object_at(i) == *object) return entries;
+    if (entries->object_at(i) == *code_cell) return entries;
   }
   if (entries->length() < kCodesStartIndex + count + 1) {
     entries = EnsureSpace(entries);
     // Count could have changed, reload it.
     count = entries->count();
   }
-  entries->set_object_at(count, *object);
+  entries->set_object_at(count, *code_cell);
   entries->set_count(count + 1);
   return entries;
 }

src/objects/code-inl.h

@@ -155,10 +155,6 @@ DependentCode::DependencyGroup DependentCode::group() {
   return static_cast<DependencyGroup>(GroupField::decode(flags()));
 }
 
-void DependentCode::set_group(DependentCode::DependencyGroup group) {
-  set_flags(GroupField::update(flags(), static_cast<int>(group)));
-}
-
 void DependentCode::set_object_at(int i, Object* object) {
   set(kCodesStartIndex + i, object);
 }

src/objects/code.h

@@ -589,6 +589,8 @@ class AbstractCode : public HeapObject {
 
 class DependentCode : public FixedArray {
  public:
+  DECL_CAST(DependentCode)
+
   enum DependencyGroup {
     // Group of code that embed a transition to this map, and depend on being
     // deoptimized when the transition is replaced by a new version.
@@ -615,18 +617,9 @@ class DependentCode : public FixedArray {
     kAllocationSiteTransitionChangedGroup
   };
 
-  static const int kGroupCount = kAllocationSiteTransitionChangedGroup + 1;
-  static const int kNextLinkIndex = 0;
-  static const int kFlagsIndex = 1;
-  static const int kCodesStartIndex = 2;
-
   bool Contains(DependencyGroup group, WeakCell* code_cell);
   bool IsEmpty(DependencyGroup group);
 
-  static Handle<DependentCode> InsertCompilationDependencies(
-      Handle<DependentCode> entries, DependencyGroup group,
-      Handle<Foreign> info);
-
   static Handle<DependentCode> InsertWeakCode(Handle<DependentCode> entries,
                                               DependencyGroup group,
                                               Handle<WeakCell> code_cell);
@@ -640,36 +633,39 @@ class DependentCode : public FixedArray {
   bool MarkCodeForDeoptimization(Isolate* isolate,
                                  DependentCode::DependencyGroup group);
 
-  // The following low-level accessors should only be used by this class
+  // The following low-level accessors are exposed only for tests.
-  // and the mark compact collector.
-  inline DependentCode* next_link();
-  inline void set_next_link(DependentCode* next);
-  inline int count();
-  inline void set_count(int value);
   inline DependencyGroup group();
-  inline void set_group(DependencyGroup group);
   inline Object* object_at(int i);
-  inline void set_object_at(int i, Object* object);
+  inline int count();
-  inline void clear_at(int i);
+  inline DependentCode* next_link();
-  inline void copy(int from, int to);
-  DECL_CAST(DependentCode)
-
-  static const char* DependencyGroupName(DependencyGroup group);
 
  private:
-  static Handle<DependentCode> Insert(Handle<DependentCode> entries,
+  static const char* DependencyGroupName(DependencyGroup group);
-                                      DependencyGroup group,
+
-                                      Handle<Object> object);
   static Handle<DependentCode> New(DependencyGroup group, Handle<Object> object,
                                    Handle<DependentCode> next);
   static Handle<DependentCode> EnsureSpace(Handle<DependentCode> entries);
+
   // Compact by removing cleared weak cells and return true if there was
   // any cleared weak cell.
   bool Compact();
+
   static int Grow(int number_of_entries) {
     if (number_of_entries < 5) return number_of_entries + 1;
     return number_of_entries * 5 / 4;
   }
+
+  static const int kGroupCount = kAllocationSiteTransitionChangedGroup + 1;
+  static const int kNextLinkIndex = 0;
+  static const int kFlagsIndex = 1;
+  static const int kCodesStartIndex = 2;
+
+  inline void set_next_link(DependentCode* next);
+  inline void set_count(int value);
+  inline void set_object_at(int i, Object* object);
+  inline void clear_at(int i);
+  inline void copy(int from, int to);
+
   inline int flags();
   inline void set_flags(int flags);
   class GroupField : public BitField<int, 0, 3> {};