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llvm-cov: Warn if object file is newer than profile

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Looking at coverage with an out of date profile can be confusing.
Provide a little hint that something might be wrong.

llvm-svn: 236408
This commit is contained in:
Justin Bogner
2015-05-04 04:09:38 +00:00
parent 0da0d4a948
commit 65337d1f3a
1 changed files with 13 additions and 0 deletions
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13
llvm/tools/llvm-cov/CodeCoverage.cpp
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@@ -195,7 +195,20 @@ 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 "warning: profile data may be out of date - object is newer\n";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()) {