Add a way to override profiled program name and PID.

public/client/TracyProfiler.cpp

@@ -425,8 +425,13 @@ static int64_t SetupHwTimer()
 }
 #endif
 
+uint32_t ___tracy_magic_pid_override = 0;
+char ___tracy_magic_process_name[64] = {};
+
 static const char* GetProcessName()
 {
+    if( *___tracy_magic_process_name != 0 ) return ___tracy_magic_process_name;
+
     const char* processName = "unknown";
 #ifdef _WIN32
     static char buf[_MAX_PATH];
@@ -750,6 +755,8 @@ static const char* GetHostInfo()
 
 static uint64_t GetPid()
 {
+    if( ___tracy_magic_pid_override != 0 ) return uint64_t( ___tracy_magic_pid_override );
+
 #if defined _WIN32
     return uint64_t( GetCurrentProcessId() );
 #else
@@ -4187,6 +4194,16 @@ void Profiler::HandleParameter( uint64_t payload )
 
 void Profiler::HandleSymbolCodeQuery( uint64_t symbol, uint32_t size )
 {
+#ifdef __linux__
+    // When profiling an external process, symbol addresses are ELF virtual
+    // addresses, not pointers in the monitor's address space.  We cannot
+    // read code bytes directly.
+    if( ___tracy_magic_pid_override != 0 )
+    {
+        AckSymbolCodeNotAvailable();
+        return;
+    }
+#endif
     if( symbol >> 63 != 0 )
     {
         QueueKernelCode( symbol, size );

public/client/TracySysTrace.cpp

@@ -412,6 +412,8 @@ static int s_ctxBufferIdx = 0;
 
 static RingBuffer* s_ring = nullptr;
 
+extern uint32_t ___tracy_magic_pid_override;
+
 static const int ThreadHashSize = 4 * 1024;
 static uint32_t s_threadHash[ThreadHashSize] = {};
 
@@ -423,7 +425,14 @@ static bool CurrentProcOwnsThread( uint32_t tid )
     if( hv == -tid ) return false;
 
     char path[256];
-    sprintf( path, "/proc/self/task/%d", tid );
+    if( ___tracy_magic_pid_override != 0 )
+    {
+        sprintf( path, "/proc/%d/task/%d", (int)___tracy_magic_pid_override, tid );
+    }
+    else
+    {
+        sprintf( path, "/proc/self/task/%d", tid );
+    }
     struct stat st;
     if( stat( path, &st ) == 0 )
     {
@@ -648,7 +657,7 @@ bool SysTraceStart( int64_t& samplingPeriod )
 #endif
 
     samplingPeriod = GetSamplingPeriod();
-    uint32_t currentPid = (uint32_t)getpid();
+    uint32_t currentPid = ___tracy_magic_pid_override != 0 ? ___tracy_magic_pid_override : (uint32_t)getpid();
 
     s_numCpus = (int)std::thread::hardware_concurrency();