Teach the pass manager's execution dump to print the current time before

each line. This is particularly nice for tracking which run of
a particular pass over a particular function was slow.

This also required making the TimeValue string much more useful. First,
there is a standard format for writing out a date and time. Let's use
that rather than strings that would have to be parsed. Second, actually
output the nanosecond resolution that timevalue claims to have.

This is proving useful working on PR19499, so I figured it would be
generally useful to commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207385 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 3 deletions

diff --git a/lib/Support/Unix/TimeValue.inc b/lib/Support/Unix/TimeValue.inc
index 80532b0b95..58c7ba3094 100644
--- a/lib/Support/Unix/TimeValue.inc
+++ b/lib/Support/Unix/TimeValue.inc
@@ -26,9 +26,11 @@ std::string TimeValue::str() const {
   struct tm Storage;
   struct tm *LT = ::localtime_r(&OurTime, &Storage);
   assert(LT);
-  char Buffer[25];
-  strftime(Buffer, 25, "%b %e %H:%M %Y", LT);
-  return std::string(Buffer);
+  char Buffer1[sizeof("YYYY-MM-DD HH:MM:SS")];
+  strftime(Buffer1, sizeof(Buffer1), "%Y-%m-%d %H:%M:%S", LT);
+  char Buffer2[sizeof("YYYY-MM-DD HH:MM:SS.MMMUUUNNN")];
+  snprintf(Buffer2, sizeof(Buffer2), "%s.%.9u", Buffer1, this->nanoseconds());
+  return std::string(Buffer2);
 }
 
 TimeValue TimeValue::now() {