use standard timers and record chrome tracing start time (#127)

* switch timers to use std::chrono
add a metadata event for start time to chrome tracing

* switch from system_clock to steady_clock

* delete OS timer files since they are no longer needed

Author: bashbaug

intercept/CMakeLists.txt

@@ -30,7 +30,6 @@ source_group(CL FILES
 
 set(CLINTERCEPT_OS_FILES
     OS/OS.h
-    OS/OS_timer.h
 )
 if(WIN32)
     list(APPEND CLINTERCEPT_OS_FILES

intercept/OS/OS_linux_common.h

@@ -22,8 +22,6 @@
 
 #pragma once
 
-#include "OS_timer.h"
-
 #include <sys/stat.h>
 #include <dlfcn.h>
 #include <pthread.h>
@@ -87,10 +85,6 @@ class Services_Common
     void    OutputDebugString(
                 const std::string& str ) const;
 
-    uint64_t    GetTimer() const;
-    uint64_t    TickToNS(
-                    uint64_t delta ) const;
-
     void*   LoadLibrary(
                 const std::string& libraryName ) const;
     void    UnloadLibrary(
@@ -113,8 +107,6 @@ class Services_Common
                 const std::string& fileName ) const;
 
 private:
-    Timer           m_Timer;
-
     bool    GetControlFromFile(
                 const std::string& fileName,
                 const std::string& controlName,
@@ -171,17 +163,6 @@ inline void Services_Common::OutputDebugString(
     syslog( LOG_USER | LOG_INFO, "%s", str.c_str() );
 }
 
-inline uint64_t Services_Common::GetTimer() const
-{
-    return m_Timer.GetTimer();
-}
-
-inline uint64_t Services_Common::TickToNS(
-    uint64_t delta ) const
-{
-    return m_Timer.TickToNS( delta );
-}
-
 inline void* Services_Common::LoadLibrary(
     const std::string& libraryName ) const
 {

intercept/OS/OS_mac_common.h

@@ -83,10 +83,6 @@ class Services_Common
     void    OutputDebugString(
                 const std::string& str ) const;
 
-    uint64_t    GetTimer() const;
-    uint64_t    TickToNS(
-                    uint64_t delta ) const;
-
     void*   LoadLibrary(
                 const std::string& libraryName ) const;
     void    UnloadLibrary(
@@ -161,20 +157,6 @@ inline void Services_Common::OutputDebugString(
     syslog( LOG_USER | LOG_INFO, "%s", str.c_str() );
 }
 
-inline uint64_t Services_Common::GetTimer() const
-{
-    timeval i;
-    gettimeofday( &i, NULL );
-    return i.tv_sec * 1000000 + i.tv_usec;
-}
-
-inline uint64_t Services_Common::TickToNS(
-    uint64_t delta ) const
-{
-    double  ns = delta * 1000.0;
-    return (uint64_t)ns;
-}
-
 inline void* Services_Common::LoadLibrary(
     const std::string& libraryName ) const
 {

intercept/OS/OS_timer.h

@@ -22,8 +22,6 @@
 
 #pragma once
 
-#include "OS_timer.h"
-
 #include <Windows.h>
 #include <string>
 
@@ -78,10 +76,6 @@ class Services_Common
     void    OutputDebugString(
                 const std::string& str ) const;
 
-    uint64_t    GetTimer() const;
-    uint64_t    TickToNS(
-                    uint64_t delta ) const;
-
     void*   LoadLibrary(
                 const std::string& libraryName ) const;
     void    UnloadLibrary(
@@ -104,18 +98,11 @@ class Services_Common
                 const std::string& fileName ) const;
 
 private:
-    Timer               m_Timer;
-
     DISALLOW_COPY_AND_ASSIGN( Services_Common );
 };
 
 inline bool Services_Common::Init()
 {
-    if( m_Timer.Init() == false )
-    {
-        return false;
-    }
-
     return true;
 }
 
@@ -245,17 +232,6 @@ inline void Services_Common::OutputDebugString(
     ::OutputDebugString( str.c_str() );
 }
 
-inline uint64_t Services_Common::GetTimer() const
-{
-    return m_Timer.GetTimer();
-}
-
-inline uint64_t Services_Common::TickToNS(
-    uint64_t delta ) const
-{
-    return m_Timer.TickToNS( delta );
-}
-
 inline void* Services_Common::LoadLibrary(
     const std::string& libraryName ) const
 {