[turbofan] Add initial support for growing stores.

src/builtins/builtins-internal.cc

 // 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.
 
 #include "src/builtins/builtins.h"
 #include "src/builtins/builtins-utils.h"
 #include "src/interface-descriptors.h"
 #include "src/macro-assembler.h"
 
 namespace v8 {
@@ skipping 33 matching lines @@
 
 void Builtins::Generate_InterruptCheck(MacroAssembler* masm) {
   masm->TailCallRuntime(Runtime::kInterrupt);
 }
 
 void Builtins::Generate_StackCheck(MacroAssembler* masm) {
   masm->TailCallRuntime(Runtime::kStackGuard);
 }
 
 // -----------------------------------------------------------------------------
-// FixedArray helpers.
+// TurboFan support builtins.
 
-void Builtins::Generate_CopyFixedArray(CodeStubAssembler* assembler) {
+void Builtins::Generate_CopyFastSmiOrObjectElements(
+    CodeStubAssembler* assembler) {
   typedef CodeStubAssembler::Label Label;
   typedef compiler::Node Node;
   typedef CodeStubAssembler::Variable Variable;
-  typedef CopyFixedArrayDescriptor Descriptor;
+  typedef CopyFastSmiOrObjectElementsDescriptor Descriptor;
 
-  Node* source = assembler->Parameter(Descriptor::kSource);
+  Node* object = assembler->Parameter(Descriptor::kObject);
+
+  // Load the {object}s elements.
+  Node* source = assembler->LoadObjectField(object, JSObject::kElementsOffset);
 
   // Load the {source} length.
   Node* source_length_tagged =
       assembler->LoadObjectField(source, FixedArray::kLengthOffset);
   Node* source_length = assembler->SmiToWord(source_length_tagged);
 
   // Compute the size of {source} in bytes.
   Node* source_size = assembler->IntPtrAdd(
       assembler->WordShl(source_length,
                          assembler->IntPtrConstant(kPointerSizeLog2)),
@@ skipping 42 matching lines @@
       assembler->StoreNoWriteBarrier(MachineRepresentation::kTagged, target,
                                      offset, value);
 
       // Increment {offset} and continue.
       var_offset.Bind(assembler->IntPtrAdd(
           offset, assembler->IntPtrConstant(kPointerSize)));
       assembler->Goto(&loop);
     }
 
     assembler->Bind(&done_loop);
-    assembler->Return(target);
+    {
+      // Update the {object}s element to {target}.
+      assembler->StoreObjectField(object, JSObject::kElementsOffset, target);
+      assembler->Return(target);
+    }
   }
 
   assembler->Bind(&if_oldspace);
   {
     // Allocate the targeting FixedArray in old space
     // (maybe even in large object space).
     Node* flags = assembler->SmiConstant(
         Smi::FromInt(AllocateDoubleAlignFlag::encode(false) |
                      AllocateTargetSpace::encode(AllocationSpace::OLD_SPACE)));
     Node* source_size_tagged = assembler->SmiFromWord(source_size);
@@ skipping 30 matching lines @@
       // Store the {value} to the {target} with a proper write barrier.
       assembler->Store(MachineRepresentation::kTagged, target, offset, value);
 
       // Increment {offset} and continue.
       var_offset.Bind(assembler->IntPtrAdd(
           offset, assembler->IntPtrConstant(kPointerSize)));
       assembler->Goto(&loop);
     }
 
     assembler->Bind(&done_loop);
-    assembler->Return(target);
+    {
+      // Update the {object}s element to {target}.
+      assembler->StoreObjectField(object, JSObject::kElementsOffset, target);
+      assembler->Return(target);
+    }
   }
 }
 
+void Builtins::Generate_GrowFastDoubleElements(CodeStubAssembler* assembler) {
+  typedef CodeStubAssembler::Label Label;
+  typedef compiler::Node Node;
+  typedef GrowArrayElementsDescriptor Descriptor;
+
+  Node* object = assembler->Parameter(Descriptor::kObject);
+  Node* key = assembler->Parameter(Descriptor::kKey);
+  Node* context = assembler->Parameter(Descriptor::kContext);
+
+  Label runtime(assembler, CodeStubAssembler::Label::kDeferred);
+  Node* elements = assembler->LoadElements(object);
+  elements = assembler->CheckAndGrowElementsCapacity(
+      context, elements, FAST_DOUBLE_ELEMENTS, key, &runtime);
+  assembler->StoreObjectField(object, JSObject::kElementsOffset, elements);
+  assembler->Return(elements);
+
+  assembler->Bind(&runtime);
+  assembler->TailCallRuntime(Runtime::kGrowArrayElements, context, object, key);
+}
+
+void Builtins::Generate_GrowFastSmiOrObjectElements(
+    CodeStubAssembler* assembler) {
+  typedef CodeStubAssembler::Label Label;
+  typedef compiler::Node Node;
+  typedef GrowArrayElementsDescriptor Descriptor;
+
+  Node* object = assembler->Parameter(Descriptor::kObject);
+  Node* key = assembler->Parameter(Descriptor::kKey);
+  Node* context = assembler->Parameter(Descriptor::kContext);
+
+  Label runtime(assembler, CodeStubAssembler::Label::kDeferred);
+  Node* elements = assembler->LoadElements(object);
+  elements = assembler->CheckAndGrowElementsCapacity(
+      context, elements, FAST_ELEMENTS, key, &runtime);
+  assembler->StoreObjectField(object, JSObject::kElementsOffset, elements);
+  assembler->Return(elements);
+
+  assembler->Bind(&runtime);
+  assembler->TailCallRuntime(Runtime::kGrowArrayElements, context, object, key);
+}
+
 }  // namespace internal
 }  // namespace v8