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// Copyright (C) 2020 The Qt Company Ltd.
// Copyright (C) 2021 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QPLUGIN_H
#define QPLUGIN_H
#if 0
#pragma qt_class(QtPlugin)
#endif
#include <QtCore/qobject.h>
#include <QtCore/qpointer.h>
#include <QtCore/qjsonobject.h>
#include <QtCore/q20algorithm.h>
QT_BEGIN_NAMESPACE
// Used up to Qt 6.2
inline constexpr unsigned char qPluginArchRequirements()
{
return 0
#ifndef QT_NO_DEBUG
| 1
#endif
#ifdef __AVX2__
| 2
# ifdef __AVX512F__
| 4
# endif
#endif
;
}
typedef QObject *(*QtPluginInstanceFunction)();
struct QPluginMetaData
{
static constexpr quint8 CurrentMetaDataVersion = 1;
static constexpr char MagicString[] = {
'Q', 'T', 'M', 'E', 'T', 'A', 'D', 'A', 'T', 'A', ' ', '!'
};
template <size_t OSize, typename OO, size_t ISize, typename II>
static constexpr void copy(OO (&out)[OSize], II (&in)[ISize])
{
static_assert(OSize <= ISize, "Output would not be fully initialized");
q20::copy_n(in, OSize, out);
}
static constexpr quint8 archRequirements()
{
quint8 v = 0;
#if defined(__AVX512F__)
v = 4; // x86-64-v4: AVX512F, AVX512BW, AVX512CD, AVX512DQ and AVX512VL
#elif defined(__AVX__) || defined(__BMI__) || defined(__BMI2__) || defined(__MOVBE__)
v = 3; // x86-64-v3: AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, XSAVE
#elif defined(__SSE3__)
v = 2; // x86-64-v2: POPCNT, SSE3, SSSE3, SSE4.1 and SSE4.2.
#elif defined(__SSE__) || defined(__MMX___)
v = 1; // x86-64 baseline: SSE and SSE2
#endif
#ifndef QT_NO_DEBUG
v |= 0x80;
#endif
return v;
}
struct Header {
quint8 version = CurrentMetaDataVersion;
quint8 qt_major_version = QT_VERSION_MAJOR;
quint8 qt_minor_version = QT_VERSION_MINOR;
quint8 plugin_arch_requirements = archRequirements();
};
static_assert(alignof(Header) == 1, "Alignment of header incorrect with this compiler");
struct MagicHeader {
char magic[sizeof(QPluginMetaData::MagicString)] = {};
constexpr MagicHeader() { copy(magic, QPluginMetaData::MagicString); }
Header header = {};
};
static_assert(alignof(MagicHeader) == 1, "Alignment of header incorrect with this compiler");
struct ElfNoteHeader {
static constexpr quint32 NoteType = 0x74510001;
static constexpr char NoteName[] = "qt-project!";
// ELF note header
quint32 n_namesz = sizeof(name);
quint32 n_descsz;
quint32 n_type = NoteType;
char name[sizeof(NoteName)] = {};
// payload
alignas(void *) // mandatory alignment as per ELF note requirements
Header header = {};
constexpr ElfNoteHeader(quint32 payloadSize) : n_descsz(sizeof(header) + payloadSize)
{ QPluginMetaData::copy(name, NoteName); }
};
static_assert(alignof(ElfNoteHeader) == alignof(void*), "Alignment of header incorrect with this compiler");
static_assert((sizeof(ElfNoteHeader::name) % 4) == 0, "ELF note name length not a multiple of 4");
const void *data;
size_t size;
};
typedef QPluginMetaData (*QtPluginMetaDataFunction)();
struct Q_CORE_EXPORT QStaticPlugin
{
public:
constexpr QStaticPlugin(QtPluginInstanceFunction i, QtPluginMetaDataFunction m)
: instance(i), rawMetaDataSize(m().size), rawMetaData(m().data)
{}
QtPluginInstanceFunction instance;
QJsonObject metaData() const;
private:
qsizetype rawMetaDataSize;
const void *rawMetaData;
friend class QFactoryLoader;
};
Q_DECLARE_TYPEINFO(QStaticPlugin, Q_PRIMITIVE_TYPE);
void Q_CORE_EXPORT qRegisterStaticPluginFunction(QStaticPlugin staticPlugin);
#if defined(Q_OF_ELF) || (defined(Q_OS_WIN) && (defined (Q_CC_GNU) || defined(Q_CC_CLANG)))
# define QT_PLUGIN_METADATA_SECTION \
__attribute__ ((section (".qtmetadata"))) __attribute__((used))
#elif defined(Q_OS_DARWIN)
# define QT_PLUGIN_METADATA_SECTION \
__attribute__ ((section ("__TEXT,qtmetadata"))) __attribute__((used))
#elif defined(Q_CC_MSVC)
// TODO: Implement section parsing for MSVC
#pragma section(".qtmetadata",read,shared)
# define QT_PLUGIN_METADATA_SECTION \
__declspec(allocate(".qtmetadata"))
#else
# define QT_PLUGIN_METADATA_SECTION
#endif
// Since Qt 6.3
template <auto (&PluginMetaData)> class QPluginMetaDataV2
{
struct ElfNotePayload : QPluginMetaData::ElfNoteHeader {
static constexpr size_t HeaderOffset = offsetof(QPluginMetaData::ElfNoteHeader, header);
quint8 payload[sizeof(PluginMetaData)] = {};
constexpr ElfNotePayload() : ElfNoteHeader(sizeof(PluginMetaData))
{ QPluginMetaData::copy(payload, PluginMetaData); }
};
struct RegularPayload : QPluginMetaData::MagicHeader {
static constexpr size_t HeaderOffset = offsetof(QPluginMetaData::MagicHeader, header);
quint8 payload[sizeof(PluginMetaData)] = {};
constexpr RegularPayload() { QPluginMetaData::copy(payload, PluginMetaData); }
};
struct StaticPayload {
static constexpr size_t HeaderOffset = 0;
QPluginMetaData::Header header = {};
quint8 payload[sizeof(PluginMetaData)] = {};
constexpr StaticPayload() { QPluginMetaData::copy(payload, PluginMetaData); }
};
#if defined(QT_STATICPLUGIN)
# define QT_PLUGIN_METADATAV2_SECTION
using Payload = StaticPayload;
#elif defined(Q_OF_ELF)
# ifdef Q_CC_CLANG
# define QT_PLUGIN_METADATAV2_SECTION \
__attribute__((section(".note.qt.metadata"), used, aligned(alignof(void *)), \
no_sanitize("address")))
# else
# define QT_PLUGIN_METADATAV2_SECTION \
__attribute__((section(".note.qt.metadata"), used, aligned(alignof(void *))))
# endif
using Payload = ElfNotePayload;
#else
# define QT_PLUGIN_METADATAV2_SECTION QT_PLUGIN_METADATA_SECTION
using Payload = RegularPayload;
#endif
Payload payload = {};
public:
operator QPluginMetaData() const
{
Q_ASSERT(reinterpret_cast<const char *>(&payload) + Payload::HeaderOffset ==
reinterpret_cast<const char *>(&payload.header));
return { &payload.header, sizeof(payload) - Payload::HeaderOffset };
}
};
#define Q_IMPORT_PLUGIN(PLUGIN) \
extern const QT_PREPEND_NAMESPACE(QStaticPlugin) qt_static_plugin_##PLUGIN(); \
class Static##PLUGIN##PluginInstance{ \
public: \
Static##PLUGIN##PluginInstance() { \
qRegisterStaticPluginFunction(qt_static_plugin_##PLUGIN()); \
} \
}; \
static Static##PLUGIN##PluginInstance static##PLUGIN##Instance;
#if defined(QT_PLUGIN_RESOURCE_INIT_FUNCTION)
# define QT_PLUGIN_RESOURCE_INIT \
extern void QT_PLUGIN_RESOURCE_INIT_FUNCTION(); \
QT_PLUGIN_RESOURCE_INIT_FUNCTION();
#else
# define QT_PLUGIN_RESOURCE_INIT
#endif
#define Q_PLUGIN_INSTANCE(IMPLEMENTATION) \
{ \
static QT_PREPEND_NAMESPACE(QPointer)<QT_PREPEND_NAMESPACE(QObject)> _instance; \
if (!_instance) { \
QT_PLUGIN_RESOURCE_INIT \
_instance = new IMPLEMENTATION; \
} \
return _instance; \
}
#if defined(QT_STATICPLUGIN)
# define QT_MOC_EXPORT_PLUGIN_COMMON(PLUGINCLASS, MANGLEDNAME) \
static QT_PREPEND_NAMESPACE(QObject) *qt_plugin_instance_##MANGLEDNAME() \
Q_PLUGIN_INSTANCE(PLUGINCLASS) \
const QT_PREPEND_NAMESPACE(QStaticPlugin) qt_static_plugin_##MANGLEDNAME() \
{ return { qt_plugin_instance_##MANGLEDNAME, qt_plugin_query_metadata_##MANGLEDNAME}; } \
/**/
# define QT_MOC_EXPORT_PLUGIN(PLUGINCLASS, PLUGINCLASSNAME) \
static QPluginMetaData qt_plugin_query_metadata_##PLUGINCLASSNAME() \
{ return { qt_pluginMetaData_##PLUGINCLASSNAME, sizeof qt_pluginMetaData_##PLUGINCLASSNAME }; } \
QT_MOC_EXPORT_PLUGIN_COMMON(PLUGINCLASS, PLUGINCLASSNAME)
# define QT_MOC_EXPORT_PLUGIN_V2(PLUGINCLASS, MANGLEDNAME, MD) \
static QT_PREPEND_NAMESPACE(QPluginMetaData) qt_plugin_query_metadata_##MANGLEDNAME() \
{ static constexpr QPluginMetaDataV2<MD> md{}; return md; } \
QT_MOC_EXPORT_PLUGIN_COMMON(PLUGINCLASS, MANGLEDNAME)
#else
# define QT_MOC_EXPORT_PLUGIN_COMMON(PLUGINCLASS, MANGLEDNAME) \
extern "C" Q_DECL_EXPORT QT_PREPEND_NAMESPACE(QObject) *qt_plugin_instance() \
Q_PLUGIN_INSTANCE(PLUGINCLASS) \
/**/
# define QT_MOC_EXPORT_PLUGIN(PLUGINCLASS, PLUGINCLASSNAME) \
extern "C" Q_DECL_EXPORT \
QPluginMetaData qt_plugin_query_metadata() \
{ return { qt_pluginMetaData_##PLUGINCLASSNAME, sizeof qt_pluginMetaData_##PLUGINCLASSNAME }; } \
QT_MOC_EXPORT_PLUGIN_COMMON(PLUGINCLASS, PLUGINCLASSNAME)
# define QT_MOC_EXPORT_PLUGIN_V2(PLUGINCLASS, MANGLEDNAME, MD) \
extern "C" Q_DECL_EXPORT QT_PREPEND_NAMESPACE(QPluginMetaData) qt_plugin_query_metadata_v2()\
{ static constexpr QT_PLUGIN_METADATAV2_SECTION QPluginMetaDataV2<MD> md{}; return md; } \
QT_MOC_EXPORT_PLUGIN_COMMON(PLUGINCLASS, MANGLEDNAME)
#endif
#define Q_EXPORT_PLUGIN(PLUGIN) \
Q_EXPORT_PLUGIN2(PLUGIN, PLUGIN)
# define Q_EXPORT_PLUGIN2(PLUGIN, PLUGINCLASS) \
static_assert(false, "Old plugin system used")
# define Q_EXPORT_STATIC_PLUGIN2(PLUGIN, PLUGINCLASS) \
static_assert(false, "Old plugin system used")
QT_END_NAMESPACE
#endif // Q_PLUGIN_H
|
