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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef O3D_GPU_PLUGIN_NP_UTILS_NP_DISPATCHER_H_
#define O3D_GPU_PLUGIN_NP_UTILS_NP_DISPATCHER_H_
#include <string>
#include "o3d/gpu_plugin/np_utils/np_utils.h"
#include "o3d/gpu_plugin/np_utils/np_headers.h"
// Dispatchers make regular member functions available as NPObject methods.
// Usage:
//
// class MyNPObject : public DefaultNPObject<NPObject> {
// public:
// int MyMethod(bool a, float b);
// NP_UTILS_BEGIN_DISPATCHER_CHAIN(MyNPObject, DispatchedNPObject)
// NP_UTILS_DISPATCHER(MyMethod, int(bool, float))
// NP_UTILS_END_DISPATCHER_CHAIN
// };
//
// Multiple member functions may be listed in the dispatcher chain. Inheritance
// is supported. The following types are supported as return types and parameter
// types:
// * bool
// * int
// * float
// * double
// * std::string
// * NPObject*
//
// These macros are used to make dispatcher chains.
#define NP_UTILS_NP_UTILS_DISPATCHER_JOIN2(a, b) a ## b
#define NP_UTILS_DISPATCHER_JOIN(a, b) NP_UTILS_NP_UTILS_DISPATCHER_JOIN2(a, b)
#define NP_UTILS_DISPATCHER_UNIQUE \
NP_UTILS_DISPATCHER_JOIN(dispatcher, __LINE__)
#define NP_UTILS_BEGIN_DISPATCHER_CHAIN(Class, BaseClass) \
static BaseNPDispatcher* GetDispatcherChain() { \
typedef Class ThisClass; \
BaseNPDispatcher* top_dispatcher = BaseClass::GetDispatcherChain(); \
#define NP_UTILS_DISPATCHER(name, Signature) \
static NPDispatcher<ThisClass, Signature> \
NP_UTILS_DISPATCHER_UNIQUE( \
top_dispatcher, \
#name, \
&ThisClass::name); \
top_dispatcher = &NP_UTILS_DISPATCHER_UNIQUE; \
#define NP_UTILS_END_DISPATCHER_CHAIN \
return top_dispatcher; \
} \
bool HasMethod(NPIdentifier name) { \
return DispatcherHasMethodHelper(GetDispatcherChain(), this, name); \
} \
bool Invoke(NPIdentifier name, \
const NPVariant* args, \
uint32_t num_args, \
NPVariant* result) { \
return DispatcherInvokeHelper(GetDispatcherChain(), \
this, \
name, \
args, \
num_args, \
result); \
} \
bool Enumerate(NPIdentifier** names, uint32_t* num_names) { \
return DispatcherEnumerateHelper(GetDispatcherChain(), \
this, \
names, \
num_names); \
} \
namespace o3d {
namespace gpu_plugin {
class BaseNPDispatcher {
public:
BaseNPDispatcher(BaseNPDispatcher* next, const NPUTF8* name);
virtual ~BaseNPDispatcher();
BaseNPDispatcher* next() const {
return next_;
}
NPIdentifier name() const {
return name_;
}
virtual int num_args() const = 0;
virtual bool Invoke(NPObject* object,
const NPVariant* args,
uint32_t num_args,
NPVariant* result) = 0;
private:
BaseNPDispatcher* next_;
NPIdentifier name_;
DISALLOW_COPY_AND_ASSIGN(BaseNPDispatcher);
};
bool DispatcherHasMethodHelper(BaseNPDispatcher* chain,
NPObject* object,
NPIdentifier name);
bool DispatcherInvokeHelper(BaseNPDispatcher* chain,
NPObject* object,
NPIdentifier name,
const NPVariant* args,
uint32_t num_args,
NPVariant* result);
bool DispatcherEnumerateHelper(BaseNPDispatcher* chain,
NPObject* object,
NPIdentifier** names,
uint32_t* num_names);
// This class should never be instantiated. It is always specialized. Attempting
// to instantiate it results in a compilation error. This might mean an
// attempt to instantiate a dispatcher with more parameters than have been
// specialized for. See the specialization code below.
template <typename NPObjectType, typename FunctionType>
struct NPDispatcher {
};
#define TO_NPVARIANT(index) \
T##index n##index; \
if (!NPVariantToValue(&n##index, args[index])) \
return false; \
#define NUM_PARAMS 0
#define PARAM_TYPENAMES
#define PARAM_TYPES
#define PARAM_NAMES
#define PARAM_DECLS // NOLINT
#define PARAM_TO_NVPARIANT_CONVERSIONS \
#include "o3d/gpu_plugin/np_utils/np_dispatcher_specializations.h" // NOLINT
#define NUM_PARAMS 1
#define PARAM_TYPENAMES , typename T0
#define PARAM_TYPES T0
#define PARAM_NAMES n0
#define PARAM_DECLS T0 n0; // NOLINT
#define PARAM_TO_NVPARIANT_CONVERSIONS \
TO_NPVARIANT(0); \
#include "o3d/gpu_plugin/np_utils/np_dispatcher_specializations.h" // NOLINT
#define NUM_PARAMS 2
#define PARAM_TYPENAMES , typename T0, typename T1
#define PARAM_TYPES T0, T1
#define PARAM_NAMES n0, n1
#define PARAM_DECLS T0 n0; T1 n1; // NOLINT
#define PARAM_TO_NVPARIANT_CONVERSIONS \
TO_NPVARIANT(0); \
TO_NPVARIANT(1); \
#include "o3d/gpu_plugin/np_utils/np_dispatcher_specializations.h" // NOLINT
#define NUM_PARAMS 3
#define PARAM_TYPENAMES , typename T0, typename T1, typename T2
#define PARAM_TYPES T0, T1, T2
#define PARAM_NAMES n0, n1, n2
#define PARAM_DECLS T0 n0; T1 n1; T2 n2; // NOLINT
#define PARAM_TO_NVPARIANT_CONVERSIONS \
TO_NPVARIANT(0); \
TO_NPVARIANT(1); \
TO_NPVARIANT(2); \
#include "o3d/gpu_plugin/np_utils/np_dispatcher_specializations.h" // NOLINT
#define NUM_PARAMS 4
#define PARAM_TYPENAMES , typename T0, typename T1, typename T2, typename T3
#define PARAM_TYPES T0, T1, T2, T3
#define PARAM_NAMES n0, n1, n2, n3
#define PARAM_DECLS T0 n0; T1 n1; T2 n2; T3 n3; // NOLINT
#define PARAM_TO_NVPARIANT_CONVERSIONS \
TO_NPVARIANT(0); \
TO_NPVARIANT(1); \
TO_NPVARIANT(2); \
TO_NPVARIANT(3); \
#include "o3d/gpu_plugin/np_utils/np_dispatcher_specializations.h" // NOLINT
#define NUM_PARAMS 5
#define PARAM_TYPENAMES , typename T0, typename T1, typename T2, typename T3, \
typename T4
#define PARAM_TYPES T0, T1, T2, T3, T4
#define PARAM_NAMES n0, n1, n2, n3, n4
#define PARAM_DECLS T0 n0; T1 n1; T2 n2; T3 n3; T4 n4; // NOLINT
#define PARAM_TO_NVPARIANT_CONVERSIONS \
TO_NPVARIANT(0); \
TO_NPVARIANT(1); \
TO_NPVARIANT(2); \
TO_NPVARIANT(3); \
TO_NPVARIANT(4); \
#include "o3d/gpu_plugin/np_utils/np_dispatcher_specializations.h" // NOLINT
#undef TO_NPVARIANT
} // namespace gpu_plugin
} // namespace o3d
#endif // O3D_GPU_PLUGIN_NP_UTILS_NP_DISPATCHER_H_
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