// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

#ifndef VM_NATIVE_ENTRY_H_
#define VM_NATIVE_ENTRY_H_

#include "vm/allocation.h"
#include "vm/assembler.h"
#include "vm/exceptions.h"
#include "vm/native_arguments.h"
#include "vm/verifier.h"

#include "include/dart_api.h"

namespace dart {

DECLARE_FLAG(bool, trace_natives);

// Forward declarations.
class Class;
class String;

typedef void (*NativeFunction)(NativeArguments* arguments);


#define NATIVE_ENTRY_FUNCTION(name) DN_##name


// Helper macros for declaring and defining native entries.
#define REGISTER_NATIVE_ENTRY(name, count)                                     \
  { ""#name, NATIVE_ENTRY_FUNCTION(name), count },


#define DEFINE_NATIVE_ENTRY(name, argument_count)                              \
  static void DN_Helper##name(Isolate* isolate, NativeArguments* arguments);   \
  void NATIVE_ENTRY_FUNCTION(name)(Dart_NativeArguments args) {                \
    CHECK_STACK_ALIGNMENT;                                                     \
    VERIFY_ON_TRANSITION;                                                      \
    NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);     \
    ASSERT(arguments->Count() == argument_count);                              \
    if (FLAG_trace_natives) OS::Print("Calling native: %s\n", ""#name);        \
    {                                                                          \
      Zone zone(arguments->isolate());                                         \
      HANDLESCOPE(arguments->isolate());                                       \
      DN_Helper##name(arguments->isolate(), arguments);                        \
    }                                                                          \
    VERIFY_ON_TRANSITION;                                                      \
  }                                                                            \
  static void DN_Helper##name(Isolate* isolate, NativeArguments* arguments)


#define DECLARE_NATIVE_ENTRY(name, argument_count)                             \
  extern void NATIVE_ENTRY_FUNCTION(name)(Dart_NativeArguments arguments);

// Natives should throw an exception if an illegal argument is passed.
// type name = value.
#define GET_NATIVE_ARGUMENT(type, name, value)                                 \
  const Instance& __##name##_instance__ = Instance::CheckedHandle(value);      \
  if (!__##name##_instance__.Is##type()) {                                     \
    GrowableArray<const Object*> __args__;                                     \
    __args__.Add(&__##name##_instance__);                                      \
    Exceptions::ThrowByType(Exceptions::kIllegalArgument, __args__);           \
  }                                                                            \
  const type& name = type::Cast(__##name##_instance__);



// Helper class for resolving and handling native functions.
class NativeEntry : public AllStatic {
 public:
  // Resolve specified dart native function to the actual native entrypoint.
  static NativeFunction ResolveNative(const Class& cls,
                                      const String& function_name,
                                      int number_of_arguments);
};

}  // namespace dart

#endif  // VM_NATIVE_ENTRY_H_