[turbofan] Adds an Allocate macro to the CodeStubAssembler.

src/code-stubs.cc

 // Copyright 2012 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/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/compiler/code-stub-assembler.h"
@@ skipping 444 matching lines @@
 Handle<Code> TurboFanCodeStub::GenerateCode() {
   const char* name = CodeStub::MajorName(MajorKey());
   Zone zone;
   CallInterfaceDescriptor descriptor(GetCallInterfaceDescriptor());
   compiler::CodeStubAssembler assembler(isolate(), &zone, descriptor,
                                         GetCodeFlags(), name);
   GenerateAssembly(&assembler);
   return assembler.GenerateCode();
 }
 
+void AllocateHeapNumberStub::GenerateAssembly(
+    compiler::CodeStubAssembler* assembler) const {
+  compiler::Node* result = assembler->Allocate(
+      HeapNumber::kSize, compiler::CodeStubAssembler::kNone);
+  compiler::Node* map_offset =
+      assembler->IntPtrConstant(HeapObject::kMapOffset - kHeapObjectTag);
+  compiler::Node* map = assembler->IntPtrAdd(result, map_offset);
+  assembler->StoreNoWriteBarrier(
+      MachineRepresentation::kTagged, map,
+      assembler->HeapConstant(isolate()->factory()->heap_number_map()));
+  assembler->Return(result);
+}
+
+void AllocateMutableHeapNumberStub::GenerateAssembly(
+    compiler::CodeStubAssembler* assembler) const {
+  compiler::Node* result = assembler->Allocate(
+      HeapNumber::kSize, compiler::CodeStubAssembler::kNone);
+  compiler::Node* map_offset =
+      assembler->IntPtrConstant(HeapObject::kMapOffset - kHeapObjectTag);
+  compiler::Node* map = assembler->IntPtrAdd(result, map_offset);
+  assembler->StoreNoWriteBarrier(
+      MachineRepresentation::kTagged, map,
+      assembler->HeapConstant(isolate()->factory()->mutable_heap_number_map()));
+  assembler->Return(result);
+}
 
 void StringLengthStub::GenerateAssembly(
     compiler::CodeStubAssembler* assembler) const {
   compiler::Node* value = assembler->Parameter(0);
   compiler::Node* string =
       assembler->LoadObjectField(value, JSValue::kValueOffset);
   compiler::Node* result =
       assembler->LoadObjectField(string, String::kLengthOffset);
   assembler->Return(result);
 }
@@ skipping 566 matching lines @@
   if (type->Is(Type::UntaggedPointer())) {
     return Representation::External();
   }
 
   DCHECK(!type->Is(Type::Untagged()));
   return Representation::Tagged();
 }
 
 }  // namespace internal
 }  // namespace v8