b3c814538b
MemoryBuffer::getFile, causing us to pick up a fstat for every file. Restore the optimization. llvm-svn: 120032
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
//===--- FileSystemStatCache.cpp - Caching for 'stat' calls ---------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the FileSystemStatCache interface.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/FileSystemStatCache.h"
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#include "llvm/System/Path.h"
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using namespace clang;
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MemorizeStatCalls::LookupResult
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MemorizeStatCalls::getStat(const char *Path, struct stat &StatBuf) {
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LookupResult Result = statChained(Path, StatBuf);
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// If the chained cache didn't know anything about the file, do the stat now
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// so we can record the result.
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if (Result == CacheMiss)
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Result = ::stat(Path, &StatBuf) ? CacheHitMissing : CacheHitExists;
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// Do not cache failed stats, it is easy to construct common inconsistent
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// situations if we do, and they are not important for PCH performance (which
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// currently only needs the stats to construct the initial FileManager
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// entries).
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if (Result == CacheHitMissing)
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return Result;
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// Cache file 'stat' results and directories with absolutely paths.
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if (!S_ISDIR(StatBuf.st_mode) || llvm::sys::Path(Path).isAbsolute())
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StatCalls[Path] = StatBuf;
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return Result;
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}
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