[stubs] Implement binary-search descriptor lookup in CSA

src/code-stub-assembler.h

 // Copyright 2016 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_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 735 matching lines @@
   Node* StringToNumber(Node* context, Node* input);
   Node* NumberToString(Node* context, Node* input);
   // Convert an object to a name.
   Node* ToName(Node* context, Node* input);
   // Convert a Non-Number object to a Number.
   Node* NonNumberToNumber(Node* context, Node* input);
   // Convert any object to a Number.
   Node* ToNumber(Node* context, Node* input);
 
   // Converts |input| to one of 2^32 integer values in the range 0 through
-  // 2^32−1, inclusive.
+  // 2^32-1, inclusive.
   // ES#sec-touint32
   compiler::Node* ToUint32(compiler::Node* context, compiler::Node* input);
 
   // Convert any object to a String.
   Node* ToString(Node* context, Node* input);
 
   // Convert any object to a Primitive.
   Node* JSReceiverToPrimitive(Node* context, Node* input);
 
   enum ToIntegerTruncationMode {
@@ skipping 426 matching lines @@
                                        Node* deferred_promise,
                                        Node* deferred_on_resolve,
                                        Node* deferred_on_reject, Node* context);
 
   // Support for printf-style debugging
   void Print(const char* s);
   void Print(const char* prefix, Node* tagged_value);
   inline void Print(Node* tagged_value) { return Print(nullptr, tagged_value); }
 
  protected:
+  void DescriptorLookup(Node* unique_name, Node* descriptors, Node* bitfield3,
+                        Label* if_found, Variable* var_name_index,
+                        Label* if_not_found);
   void DescriptorLookupLinear(Node* unique_name, Node* descriptors, Node* nof,
                               Label* if_found, Variable* var_name_index,
                               Label* if_not_found);
+  void DescriptorLookupBinary(Node* unique_name, Node* descriptors, Node* nof,
+                              Label* if_found, Variable* var_name_index,
+                              Label* if_not_found);
 
   Node* CallGetterIfAccessor(Node* value, Node* details, Node* context,
                              Node* receiver, Label* if_bailout);
 
   Node* TryToIntptr(Node* key, Label* miss);
 
   void BranchIfPrototypesHaveNoElements(Node* receiver_map,
                                         Label* definitely_no_elements,
                                         Label* possibly_elements);
 
@@ skipping 18 matching lines @@
   // otherwise. Returns either the loaded value or |value|.
   Node* EmitKeyedSloppyArguments(Node* receiver, Node* key, Node* value,
                                  Label* bailout);
 
   Node* AllocateSlicedString(Heap::RootListIndex map_root_index, Node* length,
                              Node* parent, Node* offset);
 
   Node* AllocateConsString(Heap::RootListIndex map_root_index, Node* length,
                            Node* first, Node* second, AllocationFlags flags);
 
+  // Implements DescriptorArray::number_of_entries.
+  // Returns an untagged int32.
+  Node* DescriptorArrayNumberOfEntries(Node* descriptors);
+  // Implements DescriptorArray::ToKeyIndex.
+  // Returns an untagged IntPtr.
+  Node* DescriptorArrayToKeyIndex(Node* descriptor_number);
+  // Implements DescriptorArray::GetSortedKeyIndex.
+  // Returns an untagged int32.
+  Node* DescriptorArrayGetSortedKeyIndex(Node* descriptors,
+                                         Node* descriptor_number);
+  // Implements DescriptorArray::GetKey.
+  Node* DescriptorArrayGetKey(Node* descriptors, Node* descriptor_number);
+
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 class CodeStubArguments {
  public:
   typedef compiler::Node Node;
 
   // |argc| is an uint32 value which specifies the number of arguments passed
   // to the builtin excluding the receiver.
   CodeStubArguments(CodeStubAssembler* assembler, Node* argc)
@@ skipping 72 matching lines @@
   }
 #else
 #define CSA_SLOW_ASSERT(csa, x) ((void)0)
 #endif
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_