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, 35 insertions, 1 deletions

diff --git a/llvm/lib/Support/Unix/Unix.h b/llvm/lib/Support/Unix/Unix.h
index 97e9cf86d78..239a6d60aae 100644
--- a/llvm/lib/Support/Unix/Unix.h
+++ b/llvm/lib/Support/Unix/Unix.h
@@ -19,7 +19,8 @@
 //===          is guaranteed to work on all UNIX variants.
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Config/config.h"     // Get autoconf configuration settings
+#include "llvm/Config/config.h" // Get autoconf configuration settings
+#include "llvm/Support/Chrono.h"
 #include "llvm/Support/Errno.h"
 #include <algorithm>
 #include <assert.h>
@@ -69,4 +70,37 @@ static inline bool MakeErrMsg(
   return true;
 }
 
+namespace llvm {
+namespace sys {
+
+/// Convert a struct timeval to a duration. Note that timeval can be used both
+/// as a time point and a duration. Be sure to check what the input represents.
+inline std::chrono::microseconds toDuration(const struct timeval &TV) {
+  return std::chrono::seconds(TV.tv_sec) +
+         std::chrono::microseconds(TV.tv_usec);
+}
+
+/// Convert a time point to struct timespec.
+inline struct timespec toTimeSpec(TimePoint<> TP) {
+  using namespace std::chrono;
+
+  struct timespec RetVal;
+  RetVal.tv_sec = toTimeT(TP);
+  RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count();
+  return RetVal;
+}
+
+/// Convert a time point to struct timeval.
+inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) {
+  using namespace std::chrono;
+
+  struct timeval RetVal;
+  RetVal.tv_sec = toTimeT(TP);
+  RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count();
+  return RetVal;
+}
+
+} // namespace sys
+} // namespace llvm
+
 #endif