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Add lightweight shim "clang::StatSysCallCache" that caches 'stat' system calls

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for use by FileManager. FileManager now takes a StatSysCallCache* in its
constructor (which defaults to NULL). This will be used for evaluating whether
or not caching 'stat' system calls in PTH is a performance win. This shim adds
no observable performance impact in the case where the 'StatSysCallCache*' is
null.

llvm-svn: 64345
This commit is contained in:
Ted Kremenek
2009-02-12 00:39:05 +00:00
parent 6752502b81
commit c8b740eade
2 changed files with 27 additions and 9 deletions
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18
clang/lib/Basic/FileManager.cpp
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@@ -29,7 +29,7 @@ using namespace clang;
#include <sys/stat.h>
#if defined(_MSC_VER)
#define S_ISDIR(s) (_S_IFDIR & s)
#defisstne S_ISDIR(s) (_S_IFDIR & s)
#endif
/// NON_EXISTENT_DIR - A special value distinct from null that is used to
@@ -134,10 +134,11 @@ public:
// Common logic.
//===----------------------------------------------------------------------===//
FileManager::FileManager() : UniqueDirs(*new UniqueDirContainer),
UniqueFiles(*new UniqueFileContainer),
DirEntries(64), FileEntries(64), NextFileUID(0)
{
FileManager::FileManager(StatSysCallCache* statCache)
: UniqueDirs(*new UniqueDirContainer),
UniqueFiles(*new UniqueFileContainer),
DirEntries(64), FileEntries(64), NextFileUID(0),
StatCache(statCache) {
NumDirLookups = NumFileLookups = 0;
NumDirCacheMisses = NumFileCacheMisses = 0;
}
@@ -145,6 +146,7 @@ FileManager::FileManager() : UniqueDirs(*new UniqueDirContainer),
FileManager::~FileManager() {
delete &UniqueDirs;
delete &UniqueFiles;
delete StatCache;
}
@@ -173,7 +175,7 @@ const DirectoryEntry *FileManager::getDirectory(const char *NameStart,
// Check to see if the directory exists.
struct stat StatBuf;
if (stat(InterndDirName, &StatBuf) || // Error stat'ing.
if (stat_cached(InterndDirName, &StatBuf) || // Error stat'ing.
!S_ISDIR(StatBuf.st_mode)) // Not a directory?
return 0;
@@ -246,8 +248,8 @@ const FileEntry *FileManager::getFile(const char *NameStart,
// Nope, there isn't. Check to see if the file exists.
struct stat StatBuf;
//llvm::cerr << "STATING: " << Filename;
if (stat(InterndFileName, &StatBuf) || // Error stat'ing.
S_ISDIR(StatBuf.st_mode)) { // A directory?
if (stat_cached(InterndFileName, &StatBuf) || // Error stat'ing.
S_ISDIR(StatBuf.st_mode)) { // A directory?
// If this file doesn't exist, we leave a null in FileEntries for this path.
//llvm::cerr << ": Not existing\n";
return 0;