Implement caching of stat() calls for precompiled headers, which is
essentially the same thing we do with pretokenized headers. stat()
caching improves performance of the Cocoa-prefixed "Hello, World" by
45%.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70223 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/FileManager.cpp b/lib/Basic/FileManager.cpp
index 2cd140d..cc25d33 100644
--- a/lib/Basic/FileManager.cpp
+++ b/lib/Basic/FileManager.cpp
@@ -19,6 +19,7 @@
#include "clang/Basic/FileManager.h"
#include "llvm/ADT/SmallString.h"
+#include "llvm/System/Path.h"
#include "llvm/Support/Streams.h"
#include "llvm/Config/config.h"
using namespace clang;
@@ -282,3 +283,20 @@
//llvm::cerr << PagesMapped << BytesOfPagesMapped << FSLookups;
}
+
+int MemorizeStatCalls::stat(const char *path, struct stat *buf) {
+ int result = ::stat(path, buf);
+
+ if (result != 0) {
+ // Cache failed 'stat' results.
+ struct stat empty;
+ StatCalls[path] = StatResult(result, empty);
+ }
+ else if (!S_ISDIR(buf->st_mode) || llvm::sys::Path(path).isAbsolute()) {
+ // Cache file 'stat' results and directories with absolutely
+ // paths.
+ StatCalls[path] = StatResult(result, *buf);
+ }
+
+ return result;
+}