Move ContextSlotCache to its own file

src/ast/scopeinfo.cc

Index: src/ast/scopeinfo.cc
diff --git a/src/ast/scopeinfo.cc b/src/ast/scopeinfo.cc
index 687bd198b0d20f6c9f76d54a5afef07d2b240b6a..20d343f17aa74239f08d53004646b812e8aced68 100644
--- a/src/ast/scopeinfo.cc
+++ b/src/ast/scopeinfo.cc
@@ -6,6 +6,7 @@
 
 #include <stdlib.h>
 
+#include "src/ast/context-slot-cache.h"
 #include "src/ast/scopes.h"
 #include "src/bootstrapper.h"
 
@@ -637,83 +638,7 @@ int ScopeInfo::FunctionNameEntryIndex() {
   return ReceiverEntryIndex() + (HasAllocatedReceiver() ? 1 : 0);
 }
 
-
-int ContextSlotCache::Hash(Object* data, String* name) {
-  // Uses only lower 32 bits if pointers are larger.
-  uintptr_t addr_hash =
-      static_cast<uint32_t>(reinterpret_cast<uintptr_t>(data)) >> 2;
-  return static_cast<int>((addr_hash ^ name->Hash()) % kLength);
-}
-
-
-int ContextSlotCache::Lookup(Object* data, String* name, VariableMode* mode,
-                             InitializationFlag* init_flag,
-                             MaybeAssignedFlag* maybe_assigned_flag) {
-  int index = Hash(data, name);
-  Key& key = keys_[index];
-  if ((key.data == data) && key.name->Equals(name)) {
-    Value result(values_[index]);
-    if (mode != NULL) *mode = result.mode();
-    if (init_flag != NULL) *init_flag = result.initialization_flag();
-    if (maybe_assigned_flag != NULL)
-      *maybe_assigned_flag = result.maybe_assigned_flag();
-    return result.index() + kNotFound;
-  }
-  return kNotFound;
-}
-
-
-void ContextSlotCache::Update(Handle<Object> data, Handle<String> name,
-                              VariableMode mode, InitializationFlag init_flag,
-                              MaybeAssignedFlag maybe_assigned_flag,
-                              int slot_index) {
-  DisallowHeapAllocation no_gc;
-  Handle<String> internalized_name;
-  DCHECK(slot_index > kNotFound);
-  if (StringTable::InternalizeStringIfExists(name->GetIsolate(), name).
-      ToHandle(&internalized_name)) {
-    int index = Hash(*data, *internalized_name);
-    Key& key = keys_[index];
-    key.data = *data;
-    key.name = *internalized_name;
-    // Please note value only takes a uint as index.
-    values_[index] = Value(mode, init_flag, maybe_assigned_flag,
-                           slot_index - kNotFound).raw();
 #ifdef DEBUG
-    ValidateEntry(data, name, mode, init_flag, maybe_assigned_flag, slot_index);
-#endif
-  }
-}
-
-
-void ContextSlotCache::Clear() {
-  for (int index = 0; index < kLength; index++) keys_[index].data = NULL;
-}
-
-
-#ifdef DEBUG
-
-void ContextSlotCache::ValidateEntry(Handle<Object> data, Handle<String> name,
-                                     VariableMode mode,
-                                     InitializationFlag init_flag,
-                                     MaybeAssignedFlag maybe_assigned_flag,
-                                     int slot_index) {
-  DisallowHeapAllocation no_gc;
-  Handle<String> internalized_name;
-  if (StringTable::InternalizeStringIfExists(name->GetIsolate(), name).
-      ToHandle(&internalized_name)) {
-    int index = Hash(*data, *name);
-    Key& key = keys_[index];
-    DCHECK(key.data == *data);
-    DCHECK(key.name->Equals(*name));
-    Value result(values_[index]);
-    DCHECK(result.mode() == mode);
-    DCHECK(result.initialization_flag() == init_flag);
-    DCHECK(result.maybe_assigned_flag() == maybe_assigned_flag);
-    DCHECK(result.index() + kNotFound == slot_index);
-  }
-}
-
 
 static void PrintList(const char* list_name,
                       int nof_internal_slots,