Share SharedFunctionInfo between all functions created for a FunctionTemplateInfo

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 970 matching lines @@
   if (IsHeapNumber()) {
     double num = HeapNumber::cast(this)->value();
     if (FastI2D(FastD2I(num)) == num) {
       *value = FastD2I(num);
       return true;
     }
   }
   return false;
 }
 
+Handle<SharedFunctionInfo> FunctionTemplateInfo::GetOrCreateSharedFunctionInfo(
+    Isolate* isolate, Handle<FunctionTemplateInfo> info) {
+  Object* current_info = info->shared_function_info();
+  if (current_info->IsSharedFunctionInfo()) {
+    return handle(SharedFunctionInfo::cast(current_info), isolate);
+  }
+
+  Handle<Object> class_name(info->class_name(), isolate);
+  Handle<String> name = class_name->IsString()
+                            ? Handle<String>::cast(class_name)
+                            : isolate->factory()->empty_string();
+  Handle<Code> code;
+  if (info->call_code()->IsCallHandlerInfo() &&
+      CallHandlerInfo::cast(info->call_code())->fast_handler()->IsCode()) {
+    code = isolate->builtins()->HandleFastApiCall();
+  } else {
+    code = isolate->builtins()->HandleApiCall();
+  }
+  bool is_constructor = !info->remove_prototype();
+  Handle<SharedFunctionInfo> result =
+      isolate->factory()->NewSharedFunctionInfo(name, code, is_constructor);
+  if (is_constructor) {
+    result->set_construct_stub(*isolate->builtins()->JSConstructStubApi());
+  }
+
+  result->set_length(info->length());
+  if (class_name->IsString()) result->set_instance_class_name(*class_name);
+  result->set_api_func_data(*info);
+  result->DontAdaptArguments();
+  DCHECK(result->IsApiFunction());
+
+  info->set_shared_function_info(*result);
+  return result;
+}
+
 bool FunctionTemplateInfo::IsTemplateFor(Map* map) {
   // There is a constraint on the object; check.
   if (!map->IsJSObjectMap()) return false;
   // Fetch the constructor function of the object.
   Object* cons_obj = map->GetConstructor();
   if (!cons_obj->IsJSFunction()) return false;
   JSFunction* fun = JSFunction::cast(cons_obj);
   // Iterate through the chain of inheriting function templates to
   // see if the required one occurs.
   for (Object* type = fun->shared()->function_data();
@@ skipping 17850 matching lines @@
   } else {
     // Old-style generators.
     int offset = continuation();
     CHECK(0 <= offset && offset < function()->code()->instruction_size());
     return function()->code()->SourcePosition(offset);
   }
 }
 
 }  // namespace internal
 }  // namespace v8