Urho3D/Source/ThirdParty/Tracy/client/TracyRingBuffer.hpp
SuperWangKai 30a629ca21
Tracy profiler integration. (#2776)
* Tracy profiler integration.

* Cleanup URHO3D_TRACY_PROFILING macro.

* Fix comment of Tracy build option.

* Decouple URHO3D_TRACY_PROFILING exclusively from URHO3D_PROFILING.

* Comment explains URHO3D_TRACY_PROFILING

* Update

* Update CMakeLists.txt

* Update CMakeLists.txt

* Update CMakeLists.txt

* Update CMakeLists.txt

* Update

* Update TracyCallstack.cpp

* Update

* Update CMakeLists.txt

* Update TracyCallstack.cpp

* Update TracyCallstack.cpp

Co-authored-by: 1vanK <1vanK@users.noreply.github.com>
2021-02-16 17:56:04 +03:00

117 lines
2.9 KiB
C++

namespace tracy
{
template<size_t Size>
class RingBuffer
{
public:
RingBuffer( int fd )
: m_fd( fd )
{
const auto pageSize = uint32_t( getpagesize() );
assert( Size >= pageSize );
assert( __builtin_popcount( Size ) == 1 );
m_mapSize = Size + pageSize;
auto mapAddr = mmap( nullptr, m_mapSize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
if( !mapAddr )
{
m_fd = 0;
close( fd );
return;
}
m_metadata = (perf_event_mmap_page*)mapAddr;
assert( m_metadata->data_offset == pageSize );
m_buffer = ((char*)mapAddr) + pageSize;
}
~RingBuffer()
{
if( m_metadata ) munmap( m_metadata, m_mapSize );
if( m_fd ) close( m_fd );
}
RingBuffer( const RingBuffer& ) = delete;
RingBuffer& operator=( const RingBuffer& ) = delete;
RingBuffer( RingBuffer&& other )
{
memcpy( (char*)&other, (char*)this, sizeof( RingBuffer ) );
m_metadata = nullptr;
m_fd = 0;
}
RingBuffer& operator=( RingBuffer&& other )
{
memcpy( (char*)&other, (char*)this, sizeof( RingBuffer ) );
m_metadata = nullptr;
m_fd = 0;
return *this;
}
bool IsValid() const { return m_metadata != nullptr; }
void Enable()
{
ioctl( m_fd, PERF_EVENT_IOC_ENABLE, 0 );
}
bool HasData() const
{
const auto head = LoadHead();
return head > m_metadata->data_tail;
}
void Read( void* dst, uint64_t offset, uint64_t cnt )
{
auto src = ( m_metadata->data_tail + offset ) % Size;
if( src + cnt <= Size )
{
memcpy( dst, m_buffer + src, cnt );
}
else
{
const auto s0 = Size - src;
memcpy( dst, m_buffer + src, s0 );
memcpy( (char*)dst + s0, m_buffer, cnt - s0 );
}
}
void Advance( uint64_t cnt )
{
StoreTail( m_metadata->data_tail + cnt );
}
bool CheckTscCaps() const
{
return m_metadata->cap_user_time_zero;
}
int64_t ConvertTimeToTsc( int64_t timestamp ) const
{
assert( m_metadata->cap_user_time_zero );
const auto time = timestamp - m_metadata->time_zero;
const auto quot = time / m_metadata->time_mult;
const auto rem = time % m_metadata->time_mult;
return ( quot << m_metadata->time_shift ) + ( rem << m_metadata->time_shift ) / m_metadata->time_mult;
}
private:
uint64_t LoadHead() const
{
return std::atomic_load_explicit( (const volatile std::atomic<uint64_t>*)&m_metadata->data_head, std::memory_order_acquire );
}
void StoreTail( uint64_t tail )
{
std::atomic_store_explicit( (volatile std::atomic<uint64_t>*)&m_metadata->data_tail, tail, std::memory_order_release );
}
perf_event_mmap_page* m_metadata;
char* m_buffer;
size_t m_mapSize;
int m_fd;
};
}