vtablefactory.hxx

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 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
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 */
 
#pragma once
 
#include <rtl/alloc.h>
#include <rtl/ustring.hxx>
#include <sal/types.h>
#include <typelib/typedescription.hxx>
 
#include <memory>
#include <mutex>
#include <unordered_map>
 
/*See: http://people.redhat.com/drepper/selinux-mem.html*/
#if defined(LINUX) || defined(OPENBSD) || defined(FREEBSD) \
    || defined(NETBSD) || defined(DRAGONFLY) || defined (ANDROID) \
    || defined(HAIKU)
#define USE_DOUBLE_MMAP
#endif
 
namespace bridges::cpp_uno::shared {
 
class VtableFactory {
public:
    // This structure is not defined in the generic part, but instead has to be
    // defined individually for each CPP--UNO bridge:
    struct Slot;
 
    struct Block {
        void * start;
 
#ifdef USE_DOUBLE_MMAP
        void * exec;
 
        int fd;
#endif
 
        sal_Size size;
    };
 
    struct Vtables {
        sal_Int32 count;
 
        std::unique_ptr<Block[]> blocks;
 
        Vtables()
            : count(0)
        {
        }
    };
 
    VtableFactory();
 
    ~VtableFactory();
 
    const Vtables& getVtables(typelib_InterfaceTypeDescription * type);
 
    // This function is not defined in the generic part, but instead has to be
    // defined individually for each CPP--UNO bridge:
    static Slot * mapBlockToVtable(void * block);
 
private:
    class GuardedBlocks;
    friend class GuardedBlocks;
 
    class BaseOffset;
 
    VtableFactory(VtableFactory const &) = delete;
    VtableFactory& operator =(const VtableFactory&) = delete;
 
    bool createBlock(Block &block, sal_Int32 slotCount) const;
 
    void freeBlock(Block const & block) const;
 
    sal_Int32 createVtables(
        GuardedBlocks & blocks, BaseOffset const & baseOffset,
        typelib_InterfaceTypeDescription * type, sal_Int32 vtableNumber,
        typelib_InterfaceTypeDescription * mostDerived, bool includePrimary)
        const;
 
    // This function is not defined in the generic part, but instead has to be
    // defined individually for each CPP--UNO bridge:
    static std::size_t getBlockSize(sal_Int32 slotCount);
 
    // This function is not defined in the generic part, but instead has to be
    // defined individually for each CPP--UNO bridge:
    static Slot * initializeBlock(
        void * block, sal_Int32 slotCount, sal_Int32 vtableNumber,
        typelib_InterfaceTypeDescription * type);
 
    // This function is not defined in the generic part, but instead has to be
    // defined individually for each CPP--UNO bridge:
    static unsigned char * addLocalFunctions(
        Slot ** slots, unsigned char * code,
#ifdef USE_DOUBLE_MMAP
        sal_PtrDiff writetoexecdiff,
#endif
        typelib_InterfaceTypeDescription const * type, sal_Int32 functionOffset,
        sal_Int32 functionCount, sal_Int32 vtableOffset);
 
    // This function is not defined in the generic part, but instead has to be
    // defined individually for each CPP--UNO bridge:
    static void flushCode(
        unsigned char const * begin, unsigned char const * end);
 
    typedef std::unordered_map< OUString, Vtables > Map;
 
    std::mutex m_mutex;
    Map m_map;
 
    rtl_arena_type * m_arena;
};
 
}
 
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */