[stubs] CSA::CopyFixedArrayElements() is now able to convert elements' kind while copying.

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 315 matching lines @@
                                      compiler::Node* capacity,
                                      ParameterMode mode = INTEGER_PARAMETERS,
                                      AllocationFlags flags = kNone);
 
   void FillFixedArrayWithValue(ElementsKind kind, compiler::Node* array,
                                compiler::Node* from_index,
                                compiler::Node* to_index,
                                Heap::RootListIndex value_root_index,
                                ParameterMode mode = INTEGER_PARAMETERS);
 
+  // Copies all elements from |from_array| of |length| size to
+  // |to_array| of the same size respecting the elements kind.
   void CopyFixedArrayElements(
       ElementsKind kind, compiler::Node* from_array, compiler::Node* to_array,
-      compiler::Node* element_count,
+      compiler::Node* length,
+      WriteBarrierMode barrier_mode = UPDATE_WRITE_BARRIER,
+      ParameterMode mode = INTEGER_PARAMETERS) {
+    CopyFixedArrayElements(kind, from_array, kind, to_array, length, length,
+                           barrier_mode, mode);
+  }
+
+  // Copies |element_count| elements from |from_array| to |to_array| of
+  // |capacity| size respecting both array's elements kinds.
+  void CopyFixedArrayElements(
+      ElementsKind from_kind, compiler::Node* from_array, ElementsKind to_kind,
+      compiler::Node* to_array, compiler::Node* element_count,
+      compiler::Node* capacity,
       WriteBarrierMode barrier_mode = UPDATE_WRITE_BARRIER,
       ParameterMode mode = INTEGER_PARAMETERS);
 
+  // Loads an element from |array| of |from_kind| elements by given |offset|
+  // (NOTE: not index!), does a hole check if |if_hole| is provided and
+  // converts the value so that it becomes ready for storing to array of
+  // |to_kind| elements.
+  compiler::Node* LoadElementAndPrepareForStore(compiler::Node* array,
+                                                compiler::Node* offset,
+                                                ElementsKind from_kind,
+                                                ElementsKind to_kind,
+                                                Label* if_hole);
+
   compiler::Node* CalculateNewElementsCapacity(
       compiler::Node* old_capacity, ParameterMode mode = INTEGER_PARAMETERS);
 
   compiler::Node* CheckAndGrowElementsCapacity(compiler::Node* context,
                                                compiler::Node* elements,
                                                ElementsKind kind,
                                                compiler::Node* key,
                                                Label* fail);
 
   // Allocation site manipulation
@@ skipping 300 matching lines @@
   compiler::Node* SmiShiftBitsConstant();
 
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_