[refactor] Separate generated builtins and C++ builtins into separate files

src/builtins/builtins-global-gen.cc

+// Copyright 2017 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-utils-gen.h"
+#include "src/builtins/builtins.h"
+#include "src/code-stub-assembler.h"
+
+namespace v8 {
+namespace internal {
+
+// ES6 section 18.2.2 isFinite ( number )
+TF_BUILTIN(GlobalIsFinite, CodeStubAssembler) {
+  Node* context = Parameter(4);
+
+  Label return_true(this), return_false(this);
+
+  // We might need to loop once for ToNumber conversion.
+  Variable var_num(this, MachineRepresentation::kTagged);
+  Label loop(this, &var_num);
+  var_num.Bind(Parameter(1));
+  Goto(&loop);
+  Bind(&loop);
+  {
+    Node* num = var_num.value();
+
+    // Check if {num} is a Smi or a HeapObject.
+    GotoIf(TaggedIsSmi(num), &return_true);
+
+    // Check if {num} is a HeapNumber.
+    Label if_numisheapnumber(this),
+        if_numisnotheapnumber(this, Label::kDeferred);
+    Branch(IsHeapNumberMap(LoadMap(num)), &if_numisheapnumber,
+           &if_numisnotheapnumber);
+
+    Bind(&if_numisheapnumber);
+    {
+      // Check if {num} contains a finite, non-NaN value.
+      Node* num_value = LoadHeapNumberValue(num);
+      BranchIfFloat64IsNaN(Float64Sub(num_value, num_value), &return_false,
+                           &return_true);
+    }
+
+    Bind(&if_numisnotheapnumber);
+    {
+      // Need to convert {num} to a Number first.
+      Callable callable = CodeFactory::NonNumberToNumber(isolate());
+      var_num.Bind(CallStub(callable, context, num));
+      Goto(&loop);
+    }
+  }
+
+  Bind(&return_true);
+  Return(BooleanConstant(true));
+
+  Bind(&return_false);
+  Return(BooleanConstant(false));
+}
+
+// ES6 section 18.2.3 isNaN ( number )
+TF_BUILTIN(GlobalIsNaN, CodeStubAssembler) {
+  Node* context = Parameter(4);
+
+  Label return_true(this), return_false(this);
+
+  // We might need to loop once for ToNumber conversion.
+  Variable var_num(this, MachineRepresentation::kTagged);
+  Label loop(this, &var_num);
+  var_num.Bind(Parameter(1));
+  Goto(&loop);
+  Bind(&loop);
+  {
+    Node* num = var_num.value();
+
+    // Check if {num} is a Smi or a HeapObject.
+    GotoIf(TaggedIsSmi(num), &return_false);
+
+    // Check if {num} is a HeapNumber.
+    Label if_numisheapnumber(this),
+        if_numisnotheapnumber(this, Label::kDeferred);
+    Branch(IsHeapNumberMap(LoadMap(num)), &if_numisheapnumber,
+           &if_numisnotheapnumber);
+
+    Bind(&if_numisheapnumber);
+    {
+      // Check if {num} contains a NaN.
+      Node* num_value = LoadHeapNumberValue(num);
+      BranchIfFloat64IsNaN(num_value, &return_true, &return_false);
+    }
+
+    Bind(&if_numisnotheapnumber);
+    {
+      // Need to convert {num} to a Number first.
+      Callable callable = CodeFactory::NonNumberToNumber(isolate());
+      var_num.Bind(CallStub(callable, context, num));
+      Goto(&loop);
+    }
+  }
+
+  Bind(&return_true);
+  Return(BooleanConstant(true));
+
+  Bind(&return_false);
+  Return(BooleanConstant(false));
+}
+
+}  // namespace internal
+}  // namespace v8