Custom call IC for Math.floor.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 6e6c2c639c3708d0e42af10cf5ad61c62c445a4e..ff685724a49bd269b836dba953d4c904de55e9a7 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1344,33 +1344,40 @@ bool Genesis::InstallNatives() {
 }
 
 
-static void InstallCustomCallGenerator(
-    Handle<JSFunction> holder_function,
-    CallStubCompiler::CustomGeneratorOwner owner_flag,
-    const char* function_name,
-    int id) {
-  Handle<JSObject> owner;
-  if (owner_flag == CallStubCompiler::FUNCTION) {
-    owner = Handle<JSObject>::cast(holder_function);
-  } else {
-    ASSERT(owner_flag == CallStubCompiler::INSTANCE_PROTOTYPE);
-    owner = Handle<JSObject>(
-        JSObject::cast(holder_function->instance_prototype()));
+static Handle<JSObject> ResolveCustomCallGeneratorHolder(
+    Handle<Context> global_context,
+    const char* holder_expr) {
+  Handle<GlobalObject> global(global_context->global());
+  const char* period_pos = strchr(holder_expr, '.');
+  if (period_pos == NULL) {
+    return Handle<JSObject>::cast(
+        GetProperty(global, Factory::LookupAsciiSymbol(holder_expr)));
   }
+  ASSERT_EQ(".prototype", period_pos);
+  Vector<const char> property(holder_expr, period_pos - holder_expr);
+  Handle<JSFunction> function = Handle<JSFunction>::cast(
+      GetProperty(global, Factory::LookupSymbol(property)));
+  return Handle<JSObject>(JSObject::cast(function->prototype()));
+}
+
+
+static void InstallCustomCallGenerator(Handle<JSObject> holder,
+                                       const char* function_name,
+                                       int id) {
   Handle<String> name = Factory::LookupAsciiSymbol(function_name);
-  Handle<JSFunction> function(JSFunction::cast(owner->GetProperty(*name)));
+  Handle<JSFunction> function(JSFunction::cast(holder->GetProperty(*name)));
   function->shared()->set_function_data(Smi::FromInt(id));
 }
 
 
 void Genesis::InstallCustomCallGenerators() {
   HandleScope scope;
-#define INSTALL_CALL_GENERATOR(holder_fun, owner_flag, fun_name, name)    \
-  {                                                                       \
-    Handle<JSFunction> holder(global_context()->holder_fun##_function()); \
-    const int id = CallStubCompiler::k##name##CallGenerator;              \
-    InstallCustomCallGenerator(holder, CallStubCompiler::owner_flag,      \
-                               #fun_name, id);                            \
+#define INSTALL_CALL_GENERATOR(holder_expr, fun_name, name)     \
+  {                                                             \
+    Handle<JSObject> holder = ResolveCustomCallGeneratorHolder( \
+        global_context(), #holder_expr);                        \
+    const int id = CallStubCompiler::k##name##CallGenerator;    \
+    InstallCustomCallGenerator(holder, #fun_name, id);          \
   }
   CUSTOM_CALL_IC_GENERATORS(INSTALL_CALL_GENERATOR)
 #undef INSTALL_CALL_GENERATOR