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//===--- FileSystemStatCache.cpp - Caching for 'stat' calls ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the FileSystemStatCache interface.
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/FileSystemStatCache.h"
#include "llvm/System/Path.h"
using namespace clang;
MemorizeStatCalls::LookupResult
MemorizeStatCalls::getStat(const char *Path, struct stat &StatBuf) {
LookupResult Result = statChained(Path, StatBuf);
// Do not cache failed stats, it is easy to construct common inconsistent
// situations if we do, and they are not important for PCH performance (which
// currently only needs the stats to construct the initial FileManager
// entries).
if (Result == CacheMissing)
return Result;
// Cache file 'stat' results and directories with absolutely paths.
if (!S_ISDIR(StatBuf.st_mode) || llvm::sys::Path(Path).isAbsolute())
StatCalls[Path] = StatBuf;
return Result;
}
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