X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=tools%2Fllvm-cov%2FCodeCoverage.cpp;h=4ff53301881d1b55069d71a99ceb1abccf4d2b9c;hb=69266c39908276c9ba636160d1ee9d985506ac98;hp=0331a02dfcc4cee9322f223f14fecdaf15e45d36;hpb=12f0d207532ecd11161118928c056f432eb622a2;p=oota-llvm.git

diff --git a/tools/llvm-cov/CodeCoverage.cpp b/tools/llvm-cov/CodeCoverage.cpp
index 0331a02dfcc..4ff53301881 100644
--- a/tools/llvm-cov/CodeCoverage.cpp
+++ b/tools/llvm-cov/CodeCoverage.cpp
@@ -116,8 +116,7 @@ CodeCoverageTool::getSourceFile(StringRef SourceFile) {
     error(EC.message(), SourceFile);
     return EC;
   }
-  LoadedSourceFiles.push_back(
-      std::make_pair(SourceFile, std::move(Buffer.get())));
+  LoadedSourceFiles.emplace_back(SourceFile, std::move(Buffer.get()));
   return *LoadedSourceFiles.back().second;
 }
 
@@ -195,7 +194,20 @@ CodeCoverageTool::createSourceFileView(StringRef SourceFile,
   return View;
 }
 
+static bool modifiedTimeGT(StringRef LHS, StringRef RHS) {
+  sys::fs::file_status Status;
+  if (sys::fs::status(LHS, Status))
+    return false;
+  auto LHSTime = Status.getLastModificationTime();
+  if (sys::fs::status(RHS, Status))
+    return false;
+  auto RHSTime = Status.getLastModificationTime();
+  return LHSTime > RHSTime;
+}
+
 std::unique_ptr<CoverageMapping> CodeCoverageTool::load() {
+  if (modifiedTimeGT(ObjectFilename, PGOFilename))
+    errs() << "warning: profile data may be out of date - object is newer\n";
   auto CoverageOrErr = CoverageMapping::load(ObjectFilename, PGOFilename,
                                              CoverageArch);
   if (std::error_code EC = CoverageOrErr.getError()) {