1 files changed, 113 insertions, 0 deletions
diff --git a/deps/v8/src/ic/call-optimization.cc b/deps/v8/src/ic/call-optimization.cc
new file mode 100644
index 0000000000..7ef1b7ed82
--- /dev/null
+++ b/deps/v8/src/ic/call-optimization.cc
@@ -0,0 +1,113 @@
+// Copyright 2014 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/v8.h"
+
+#include "src/ic/call-optimization.h"
+
+
+namespace v8 {
+namespace internal {
+
+CallOptimization::CallOptimization(Handle<JSFunction> function) {
+  Initialize(function);
+}
+
+
+Handle<JSObject> CallOptimization::LookupHolderOfExpectedType(
+    Handle<Map> object_map, HolderLookup* holder_lookup) const {
+  DCHECK(is_simple_api_call());
+  if (!object_map->IsJSObjectMap()) {
+    *holder_lookup = kHolderNotFound;
+    return Handle<JSObject>::null();
+  }
+  if (expected_receiver_type_.is_null() ||
+      expected_receiver_type_->IsTemplateFor(*object_map)) {
+    *holder_lookup = kHolderIsReceiver;
+    return Handle<JSObject>::null();
+  }
+  while (true) {
+    if (!object_map->prototype()->IsJSObject()) break;
+    Handle<JSObject> prototype(JSObject::cast(object_map->prototype()));
+    if (!prototype->map()->is_hidden_prototype()) break;
+    object_map = handle(prototype->map());
+    if (expected_receiver_type_->IsTemplateFor(*object_map)) {
+      *holder_lookup = kHolderFound;
+      return prototype;
+    }
+  }
+  *holder_lookup = kHolderNotFound;
+  return Handle<JSObject>::null();
+}
+
+
+bool CallOptimization::IsCompatibleReceiver(Handle<Object> receiver,
+                                            Handle<JSObject> holder) const {
+  DCHECK(is_simple_api_call());
+  if (!receiver->IsJSObject()) return false;
+  Handle<Map> map(JSObject::cast(*receiver)->map());
+  HolderLookup holder_lookup;
+  Handle<JSObject> api_holder = LookupHolderOfExpectedType(map, &holder_lookup);
+  switch (holder_lookup) {
+    case kHolderNotFound:
+      return false;
+    case kHolderIsReceiver:
+      return true;
+    case kHolderFound:
+      if (api_holder.is_identical_to(holder)) return true;
+      // Check if holder is in prototype chain of api_holder.
+      {
+        JSObject* object = *api_holder;
+        while (true) {
+          Object* prototype = object->map()->prototype();
+          if (!prototype->IsJSObject()) return false;
+          if (prototype == *holder) return true;
+          object = JSObject::cast(prototype);
+        }
+      }
+      break;
+  }
+  UNREACHABLE();
+  return false;
+}
+
+
+void CallOptimization::Initialize(Handle<JSFunction> function) {
+  constant_function_ = Handle<JSFunction>::null();
+  is_simple_api_call_ = false;
+  expected_receiver_type_ = Handle<FunctionTemplateInfo>::null();
+  api_call_info_ = Handle<CallHandlerInfo>::null();
+
+  if (function.is_null() || !function->is_compiled()) return;
+
+  constant_function_ = function;
+  AnalyzePossibleApiFunction(function);
+}
+
+
+void CallOptimization::AnalyzePossibleApiFunction(Handle<JSFunction> function) {
+  if (!function->shared()->IsApiFunction()) return;
+  Handle<FunctionTemplateInfo> info(function->shared()->get_api_func_data());
+
+  // Require a C++ callback.
+  if (info->call_code()->IsUndefined()) return;
+  api_call_info_ =
+      Handle<CallHandlerInfo>(CallHandlerInfo::cast(info->call_code()));
+
+  // Accept signatures that either have no restrictions at all or
+  // only have restrictions on the receiver.
+  if (!info->signature()->IsUndefined()) {
+    Handle<SignatureInfo> signature =
+        Handle<SignatureInfo>(SignatureInfo::cast(info->signature()));
+    if (!signature->args()->IsUndefined()) return;
+    if (!signature->receiver()->IsUndefined()) {
+      expected_receiver_type_ = Handle<FunctionTemplateInfo>(
+          FunctionTemplateInfo::cast(signature->receiver()));
+    }
+  }
+
+  is_simple_api_call_ = true;
+}
+}
+}  // namespace v8::internal