tracy/common/TracySystem.cpp

#if defined _MSC_VER || defined __CYGWIN__ || defined _WIN32
# ifndef WIN32_LEAN_AND_MEAN
#  define WIN32_LEAN_AND_MEAN
# endif
# ifndef NOMINMAX
#  define NOMINMAX
# endif
#endif
#ifdef _MSC_VER
#  pragma warning(disable:4996)
#endif
#if defined _WIN32 || defined __CYGWIN__
#  include <windows.h>
#  include <malloc.h>
#else
#  include <pthread.h>
#  include <string.h>
#  include <unistd.h>
#endif

#ifdef __linux__
#  ifdef __ANDROID__
#    include <sys/types.h>
#  else
#    include <sys/syscall.h>
#  endif
#  include <fcntl.h>
#elif defined __FreeBSD__
#  include <sys/thr.h>
#elif defined __NetBSD__ || defined __DragonFly__
#  include <sys/lwp.h>
#endif

#ifdef __MINGW32__
#  define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>

#include "TracySystem.hpp"

#if defined _WIN32 || defined __CYGWIN__
extern "C" typedef HRESULT (WINAPI *t_SetThreadDescription)( HANDLE, PCWSTR );
extern "C" typedef HRESULT (WINAPI *t_GetThreadDescription)( HANDLE, PWSTR* );
#endif

#ifdef TRACY_ENABLE
#  include <atomic>
#  include "TracyAlloc.hpp"
#endif

namespace tracy
{

namespace detail
{

TRACY_API uint64_t GetThreadHandleImpl()
{
#if defined _WIN32 || defined __CYGWIN__
    static_assert( sizeof( decltype( GetCurrentThreadId() ) ) <= sizeof( uint64_t ), "Thread handle too big to fit in protocol" );
    return uint64_t( GetCurrentThreadId() );
#elif defined __APPLE__
    uint64_t id;
    pthread_threadid_np( pthread_self(), &id );
    return id;
#elif defined __ANDROID__
    return (uint64_t)gettid();
#elif defined __linux__
    return (uint64_t)syscall( SYS_gettid );
#elif defined __FreeBSD__
    long id;
    thr_self( &id );
    return id;
#elif defined __NetBSD__
    return _lwp_self();
#elif defined __DragonFly__
    return lwp_gettid();
#elif defined __OpenBSD__
    return getthrid();
#else
    static_assert( sizeof( decltype( pthread_self() ) ) <= sizeof( uint64_t ), "Thread handle too big to fit in protocol" );
    return uint64_t( pthread_self() );
#endif

}

}

#ifdef TRACY_ENABLE
struct ThreadNameData
{
    uint64_t id;
    const char* name;
    ThreadNameData* next;
};
std::atomic<ThreadNameData*>& GetThreadNameData();
#endif

#ifdef _MSC_VER
#  pragma pack( push, 8 )
struct THREADNAME_INFO
{
    DWORD dwType;
    LPCSTR szName;
    DWORD dwThreadID;
    DWORD dwFlags;
};
#  pragma pack(pop)

void ThreadNameMsvcMagic( const THREADNAME_INFO& info )
{
    __try
    {
        RaiseException( 0x406D1388, 0, sizeof(info)/sizeof(ULONG_PTR), (ULONG_PTR*)&info );
    }
    __except(EXCEPTION_EXECUTE_HANDLER)
    {
    }
}
#endif

TRACY_API void SetThreadName( const char* name )
{
#if defined _WIN32 || defined __CYGWIN__
    static auto _SetThreadDescription = (t_SetThreadDescription)GetProcAddress( GetModuleHandleA( "kernel32.dll" ), "SetThreadDescription" );
    if( _SetThreadDescription )
    {
        wchar_t buf[256];
        mbstowcs( buf, name, 256 );
        _SetThreadDescription( GetCurrentThread(), buf );
    }
    else
    {
#  if defined _MSC_VER
        THREADNAME_INFO info;
        info.dwType = 0x1000;
        info.szName = name;
        info.dwThreadID = GetCurrentThreadId();
        info.dwFlags = 0;
        ThreadNameMsvcMagic( info );
#  endif
    }
#elif defined _GNU_SOURCE && !defined __EMSCRIPTEN__ && !defined __CYGWIN__
    {
        const auto sz = strlen( name );
        if( sz <= 15 )
        {
            pthread_setname_np( pthread_self(), name );
        }
        else
        {
            char buf[16];
            memcpy( buf, name, 15 );
            buf[15] = '\0';
            pthread_setname_np( pthread_self(), buf );
        }
    }
#endif
#ifdef TRACY_ENABLE
    {
        const auto sz = strlen( name );
        char* buf = (char*)tracy_malloc( sz+1 );
        memcpy( buf, name, sz );
        buf[sz] = '\0';
        auto data = (ThreadNameData*)tracy_malloc_fast( sizeof( ThreadNameData ) );
        data->id = detail::GetThreadHandleImpl();
        data->name = buf;
        data->next = GetThreadNameData().load( std::memory_order_relaxed );
        while( !GetThreadNameData().compare_exchange_weak( data->next, data, std::memory_order_release, std::memory_order_relaxed ) ) {}
    }
#endif
}

TRACY_API const char* GetThreadName( uint64_t id )
{
    static char buf[256];
#ifdef TRACY_ENABLE
    auto ptr = GetThreadNameData().load( std::memory_order_relaxed );
    while( ptr )
    {
        if( ptr->id == id )
        {
            return ptr->name;
        }
        ptr = ptr->next;
    }
#else
#  if defined _WIN32 || defined __CYGWIN__
    static auto _GetThreadDescription = (t_GetThreadDescription)GetProcAddress( GetModuleHandleA( "kernel32.dll" ), "GetThreadDescription" );
    if( _GetThreadDescription )
    {
        auto hnd = OpenThread( THREAD_QUERY_LIMITED_INFORMATION, FALSE, (DWORD)id );
        if( hnd != 0 )
        {
            PWSTR tmp;
            _GetThreadDescription( hnd, &tmp );
            auto ret = wcstombs( buf, tmp, 256 );
            CloseHandle( hnd );
            if( ret != 0 )
            {
                return buf;
            }
        }
    }
#  elif defined __linux__
    int cs, fd;
    char path[32];
#   ifdef __ANDROID__
    int tid = gettid();
#   else
    int tid = (int) syscall( SYS_gettid );
#   endif
    snprintf( path, sizeof( path ), "/proc/self/task/%d/comm", tid );
    sprintf( buf, "%" PRIu64, id );
#   ifndef __ANDROID__
    pthread_setcancelstate( PTHREAD_CANCEL_DISABLE, &cs );
#   endif
    if ( ( fd = open( path, O_RDONLY ) ) > 0) {
        int len = read( fd, buf, 255 );
        if( len > 0 )
        {
            buf[len] = 0;
            if( len > 1 && buf[len-1] == '\n' )
            {
                buf[len-1] = 0;
            }
        }
        close( fd );
    }
#   ifndef __ANDROID__
    pthread_setcancelstate( cs, 0 );
#   endif
    return buf;
#  endif
#endif
    sprintf( buf, "%" PRIu64, id );
    return buf;
}

TRACY_API const char* GetEnvVar( const char* name )
{
#if defined _WIN32
    // unfortunately getenv() on Windows is just fundamentally broken.  It caches the entire
    // environment block once on startup, then never refreshes it again.  If any environment
    // strings are added or modified after startup of the CRT, those changes will not be
    // seen by getenv().  This removes the possibility of an app using this SDK from
    // programmatically setting any of the behaviour controlling envvars here.
    //
    // To work around this, we'll instead go directly to the Win32 environment strings APIs
    // to get the current value.
    static char buffer[1024];
    DWORD const kBufferSize = DWORD(sizeof(buffer) / sizeof(buffer[0]));
    DWORD count = GetEnvironmentVariableA(name, buffer, kBufferSize);

    if( count == 0 )
        return nullptr;

    if( count >= kBufferSize )
    {
        char* buf = reinterpret_cast<char*>(_alloca(count + 1));
        count = GetEnvironmentVariableA(name, buf, count + 1);
        memcpy(buffer, buf, kBufferSize);
        buffer[kBufferSize - 1] = 0;
    }

    return buffer;
#else
    return getenv(name);
#endif
}

}

#ifdef __cplusplus
extern "C" {
#endif

TRACY_API void ___tracy_set_thread_name( const char* name ) { tracy::SetThreadName( name ); }

#ifdef __cplusplus
}
#endif