diff options
Diffstat (limited to 'clang/lib/Basic/FileSystemStatCache.cpp')
| -rw-r--r-- | clang/lib/Basic/FileSystemStatCache.cpp | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/clang/lib/Basic/FileSystemStatCache.cpp b/clang/lib/Basic/FileSystemStatCache.cpp index 6457414df98..b2d43e47447 100644 --- a/clang/lib/Basic/FileSystemStatCache.cpp +++ b/clang/lib/Basic/FileSystemStatCache.cpp @@ -19,9 +19,35 @@ using namespace clang; #define S_ISDIR(s) (_S_IFDIR & s) #endif +/// FileSystemStatCache::get - Get the 'stat' information for the specified +/// path, using the cache to accellerate it if possible. This returns true if +/// the path does not exist or false if it exists. +/// +/// If FileDescriptor is non-null, then this lookup should only return success +/// for files (not directories). If it is null this lookup should only return +/// success for directories (not files). On a successful file lookup, the +/// implementation can optionally fill in FileDescriptor with a valid +/// descriptor and the client guarantees that it will close it. +bool FileSystemStatCache::get(const char *Path, struct stat &StatBuf, + int *FileDescriptor, FileSystemStatCache *Cache) { + LookupResult R; + + if (Cache) + R = Cache->getStat(Path, StatBuf, FileDescriptor); + else + R = ::stat(Path, &StatBuf) != 0 ? CacheMissing : CacheExists; + + if (R == CacheMissing) return true; + + bool isForDir = FileDescriptor == 0; + return S_ISDIR(StatBuf.st_mode) != isForDir; +} + + MemorizeStatCalls::LookupResult -MemorizeStatCalls::getStat(const char *Path, struct stat &StatBuf) { - LookupResult Result = statChained(Path, StatBuf); +MemorizeStatCalls::getStat(const char *Path, struct stat &StatBuf, + int *FileDescriptor) { + LookupResult Result = statChained(Path, StatBuf, FileDescriptor); // 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 |
