Initial implementation of the TimeValue abstraction.

llvm-svn: 16511

1 files changed, 53 insertions, 0 deletions

diff --git a/llvm/lib/System/TimeValue.cpp b/llvm/lib/System/TimeValue.cpp
new file mode 100644
index 00000000000..68778a5e44d
--- /dev/null
+++ b/llvm/lib/System/TimeValue.cpp
@@ -0,0 +1,53 @@
+//===-- TimeValue.cpp - Implement OS TimeValue Concept ----------*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+//  This file implements the operating system TimeValue concept.
+//
+//===----------------------------------------------------------------------===//
+
+#include <llvm/System/TimeValue.h>
+
+namespace llvm {
+using namespace sys;
+
+const TimeValue TimeValue::MinTime 		= TimeValue ( INT64_MIN,0 );
+const TimeValue TimeValue::MaxTime 		= TimeValue ( INT64_MAX,0 );
+const TimeValue TimeValue::ZeroTime		= TimeValue ( 0,0 );
+const TimeValue TimeValue::PosixZeroTime 	= TimeValue ( -946684800,0 );
+const TimeValue TimeValue::Win32ZeroTime 	= TimeValue ( -12591158400ULL,0 );
+
+void
+TimeValue::normalize( void ) {
+  if ( nanos_ >= NANOSECONDS_PER_SECOND ) {
+    do {
+      seconds_++;
+      nanos_ -= NANOSECONDS_PER_SECOND;
+    } while ( nanos_ >= NANOSECONDS_PER_SECOND );
+  } else if (nanos_ <= -NANOSECONDS_PER_SECOND ) {
+    do {
+      seconds_--;
+      nanos_ += NANOSECONDS_PER_SECOND;
+    } while (nanos_ <= -NANOSECONDS_PER_SECOND);
+  }
+
+  if (seconds_ >= 1 && nanos_ < 0) {
+    seconds_--;
+    nanos_ += NANOSECONDS_PER_SECOND;
+  } else if (seconds_ < 0 && nanos_ > 0) {
+    seconds_++;
+    nanos_ -= NANOSECONDS_PER_SECOND;
+  }
+}
+
+}
+
+/// Include the platform specific portion of TimeValue class
+#include "platform/TimeValue.cpp"
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab