PTH: Cache stat information for files in the PTH file. Hook up FileManager
to use this stat information in the PTH file using a 'StatSysCallCache' object.
Performance impact (Cocoa.h, PTH):
- number of stat calls reduces from 1230 to 425
- fsyntax-only: time improves by 4.2%
We can reduce the number of stat calls to almost zero by caching negative stat
calls and directory stat calls in the PTH file as well.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64353 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/Preprocessor.cpp b/lib/Lex/Preprocessor.cpp
index db5ca2b..69aa7cb 100644
--- a/lib/Lex/Preprocessor.cpp
+++ b/lib/Lex/Preprocessor.cpp
@@ -32,6 +32,7 @@
#include "clang/Lex/ScratchBuffer.h"
#include "clang/Lex/LexDiagnostic.h"
#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/FileManager.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/SmallVector.h"
@@ -117,6 +118,11 @@
delete Callbacks;
}
+void Preprocessor::setPTHManager(PTHManager* pm) {
+ PTH.reset(pm);
+ FileMgr.setStatCache(PTH->createStatCache());
+}
+
void Preprocessor::DumpToken(const Token &Tok, bool DumpFlags) const {
llvm::cerr << tok::getTokenName(Tok.getKind()) << " '"
<< getSpelling(Tok) << "'";