Add support for a chain of stat caches in the FileManager, rather than

only supporting a single stat cache. The immediate benefit of this
change is that we can now generate a PCH/AST file when including
another PCH file; in the future, the chain of stat caches will likely
be useful with multiple levels of PCH files.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@84263 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/Frontend/CacheTokens.cpp b/lib/Frontend/CacheTokens.cpp
index e7fc5660ad..169fd5ebf9 100644
--- a/lib/Frontend/CacheTokens.cpp
+++ b/lib/Frontend/CacheTokens.cpp
@@ -516,7 +516,7 @@ public:
   ~StatListener() {}
 
   int stat(const char *path, struct stat *buf) {
-    int result = ::stat(path, buf);
+    int result = StatSysCallCache::stat(path, buf);
 
     if (result != 0) // Failed 'stat'.
       PM.insert(path, PTHEntry());
@@ -553,7 +553,8 @@ void clang::CacheTokens(Preprocessor &PP, llvm::raw_fd_ostream* OS) {
   PTHWriter PW(*OS, PP);
 
   // Install the 'stat' system call listener in the FileManager.
-  PP.getFileManager().setStatCache(new StatListener(PW.getPM()));
+  StatListener *StatCache = new StatListener(PW.getPM());
+  PP.getFileManager().addStatCache(StatCache, /*AtBeginning=*/true);
 
   // Lex through the entire file.  This will populate SourceManager with
   // all of the header information.
@@ -562,7 +563,7 @@ void clang::CacheTokens(Preprocessor &PP, llvm::raw_fd_ostream* OS) {
   do { PP.Lex(Tok); } while (Tok.isNot(tok::eof));
 
   // Generate the PTH file.
-  PP.getFileManager().setStatCache(0);
+  PP.getFileManager().removeStatCache(StatCache);
   PW.GeneratePTH(&MainFileName);
 }