Remove TimeValue usage from llvm/Support

Summary:
This is a follow-up to D25416. It removes all usages of TimeValue from
llvm/Support library (except for the actual TimeValue declaration), and replaces
them with appropriate usages of std::chrono. To facilitate this, I have added
small utility functions for converting time points and durations into appropriate
OS-specific types (FILETIME, struct timespec, ...).

Reviewers: zturner, mehdi_amini

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D25730

llvm-svn: 284966

1 files changed, 5 insertions, 17 deletions

diff --git a/llvm/lib/Support/Windows/Process.inc b/llvm/lib/Support/Windows/Process.inc
index b012991c2a5..8d646b3217a 100644
--- a/llvm/lib/Support/Windows/Process.inc
+++ b/llvm/lib/Support/Windows/Process.inc
@@ -49,18 +49,6 @@
 using namespace llvm;
 using namespace sys;
 
-static TimeValue getTimeValueFromFILETIME(FILETIME Time) {
-  ULARGE_INTEGER TimeInteger;
-  TimeInteger.LowPart = Time.dwLowDateTime;
-  TimeInteger.HighPart = Time.dwHighDateTime;
-
-  // FILETIME's are # of 100 nanosecond ticks (1/10th of a microsecond)
-  return TimeValue(
-      static_cast<TimeValue::SecondsType>(TimeInteger.QuadPart / 10000000),
-      static_cast<TimeValue::NanoSecondsType>(
-          (TimeInteger.QuadPart % 10000000) * 100));
-}
-
 // This function retrieves the page size using GetNativeSystemInfo() and is
 // present solely so it can be called once to initialize the self_process member
 // below.
@@ -93,17 +81,17 @@ Process::GetMallocUsage()
   return size;
 }
 
-void Process::GetTimeUsage(TimeValue &elapsed, TimeValue &user_time,
-                           TimeValue &sys_time) {
-  elapsed = TimeValue::now();
+void Process::GetTimeUsage(TimePoint<> &elapsed, std::chrono::nanoseconds &user_time,
+                           std::chrono::nanoseconds &sys_time) {
+  elapsed = std::chrono::system_clock::now();;
 
   FILETIME ProcCreate, ProcExit, KernelTime, UserTime;
   if (GetProcessTimes(GetCurrentProcess(), &ProcCreate, &ProcExit, &KernelTime,
                       &UserTime) == 0)
     return;
 
-  user_time = getTimeValueFromFILETIME(UserTime);
-  sys_time = getTimeValueFromFILETIME(KernelTime);
+  user_time = toDuration(UserTime);
+  sys_time = toDuration(KernelTime);
 }
 
 // Some LLVM programs such as bugpoint produce core files as a normal part of