From 78946863d6d44475bb3363e07587fedb053d65d5 Mon Sep 17 00:00:00 2001
From: Emil Rakadjiev <emil.rakadjiev.bf@hitachi.com>
Date: Mon, 9 Mar 2015 18:52:11 +0900
Subject: Timestamp improvements. Replaced inefficient
 llvm::sys::Process::GetTimeUsage() with TimeValue::now(), because in many
 cases only the wall clock time is needed, not the user and sys times (which
 are significantly more expensive to get). Updated TimingSolver and WallTimer
 accordingly.

---
 lib/Core/TimingSolver.cpp | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

(limited to 'lib/Core')

diff --git a/lib/Core/TimingSolver.cpp b/lib/Core/TimingSolver.cpp
index 037b23f3..b70bcbef 100644
--- a/lib/Core/TimingSolver.cpp
+++ b/lib/Core/TimingSolver.cpp
@@ -13,10 +13,11 @@
 #include "klee/ExecutionState.h"
 #include "klee/Solver.h"
 #include "klee/Statistics.h"
+#include "klee/Internal/System/Time.h"
 
 #include "CoreStats.h"
 
-#include "llvm/Support/Process.h"
+#include "llvm/Support/TimeValue.h"
 
 using namespace klee;
 using namespace llvm;
@@ -31,15 +32,14 @@ bool TimingSolver::evaluate(const ExecutionState& state, ref<Expr> expr,
     return true;
   }
 
-  sys::TimeValue now(0,0),user(0,0),delta(0,0),sys(0,0);
-  sys::Process::GetTimeUsage(now,user,sys);
+  sys::TimeValue now = util::getWallTimeVal();
 
   if (simplifyExprs)
     expr = state.constraints.simplifyExpr(expr);
 
   bool success = solver->evaluate(Query(state.constraints, expr), result);
 
-  sys::Process::GetTimeUsage(delta,user,sys);
+  sys::TimeValue delta = util::getWallTimeVal();
   delta -= now;
   stats::solverTime += delta.usec();
   state.queryCost += delta.usec()/1000000.;
@@ -55,15 +55,14 @@ bool TimingSolver::mustBeTrue(const ExecutionState& state, ref<Expr> expr,
     return true;
   }
 
-  sys::TimeValue now(0,0),user(0,0),delta(0,0),sys(0,0);
-  sys::Process::GetTimeUsage(now,user,sys);
+  sys::TimeValue now = util::getWallTimeVal();
 
   if (simplifyExprs)
     expr = state.constraints.simplifyExpr(expr);
 
   bool success = solver->mustBeTrue(Query(state.constraints, expr), result);
 
-  sys::Process::GetTimeUsage(delta,user,sys);
+  sys::TimeValue delta = util::getWallTimeVal();
   delta -= now;
   stats::solverTime += delta.usec();
   state.queryCost += delta.usec()/1000000.;
@@ -102,15 +101,14 @@ bool TimingSolver::getValue(const ExecutionState& state, ref<Expr> expr,
     return true;
   }
   
-  sys::TimeValue now(0,0),user(0,0),delta(0,0),sys(0,0);
-  sys::Process::GetTimeUsage(now,user,sys);
+  sys::TimeValue now = util::getWallTimeVal();
 
   if (simplifyExprs)
     expr = state.constraints.simplifyExpr(expr);
 
   bool success = solver->getValue(Query(state.constraints, expr), result);
 
-  sys::Process::GetTimeUsage(delta,user,sys);
+  sys::TimeValue delta = util::getWallTimeVal();
   delta -= now;
   stats::solverTime += delta.usec();
   state.queryCost += delta.usec()/1000000.;
@@ -127,14 +125,13 @@ TimingSolver::getInitialValues(const ExecutionState& state,
   if (objects.empty())
     return true;
 
-  sys::TimeValue now(0,0),user(0,0),delta(0,0),sys(0,0);
-  sys::Process::GetTimeUsage(now,user,sys);
+  sys::TimeValue now = util::getWallTimeVal();
 
   bool success = solver->getInitialValues(Query(state.constraints,
                                                 ConstantExpr::alloc(0, Expr::Bool)), 
                                           objects, result);
   
-  sys::Process::GetTimeUsage(delta,user,sys);
+  sys::TimeValue delta = util::getWallTimeVal();
   delta -= now;
   stats::solverTime += delta.usec();
   state.queryCost += delta.usec()/1000000.;
-- 
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