Import LLVM 8.0.0 release including clang, lld and lldb.

1 files changed, 11 insertions, 8 deletions

diff --git a/gnu/llvm/tools/clang/lib/Serialization/ModuleManager.cpp b/gnu/llvm/tools/clang/lib/Serialization/ModuleManager.cpp
index 57ebaca10c9..54e0c08c5bc 100644
--- a/gnu/llvm/tools/clang/lib/Serialization/ModuleManager.cpp
+++ b/gnu/llvm/tools/clang/lib/Serialization/ModuleManager.cpp
@@ -16,12 +16,11 @@
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/MemoryBufferCache.h"
-#include "clang/Basic/VirtualFileSystem.h"
-#include "clang/Frontend/PCHContainerOperations.h"
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/ModuleMap.h"
 #include "clang/Serialization/GlobalModuleIndex.h"
 #include "clang/Serialization/Module.h"
+#include "clang/Serialization/PCHContainerOperations.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallPtrSet.h"
@@ -33,6 +32,7 @@
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/GraphWriter.h"
 #include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include <algorithm>
 #include <cassert>
 #include <memory>
@@ -150,7 +150,7 @@ ModuleManager::addModule(StringRef FileName, ModuleKind Type,
 
   if (NewModule->Kind == MK_ImplicitModule) {
     std::string TimestampFilename = NewModule->getTimestampFilename();
-    vfs::Status Status;
+    llvm::vfs::Status Status;
     // A cached stat value would be fine as well.
     if (!FileMgr.getNoncachedStatValue(TimestampFilename, Status))
       NewModule->InputFilesValidationTimestamp =
@@ -161,21 +161,24 @@ ModuleManager::addModule(StringRef FileName, ModuleKind Type,
   if (std::unique_ptr<llvm::MemoryBuffer> Buffer = lookupBuffer(FileName)) {
     // The buffer was already provided for us.
     NewModule->Buffer = &PCMCache->addBuffer(FileName, std::move(Buffer));
+    // Since the cached buffer is reused, it is safe to close the file
+    // descriptor that was opened while stat()ing the PCM in
+    // lookupModuleFile() above, it won't be needed any longer.
+    Entry->closeFile();
   } else if (llvm::MemoryBuffer *Buffer = PCMCache->lookupBuffer(FileName)) {
     NewModule->Buffer = Buffer;
+    // As above, the file descriptor is no longer needed.
+    Entry->closeFile();
   } else {
     // Open the AST file.
     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buf((std::error_code()));
     if (FileName == "-") {
       Buf = llvm::MemoryBuffer::getSTDIN();
     } else {
-      // Leave the FileEntry open so if it gets read again by another
-      // ModuleManager it must be the same underlying file.
-      // FIXME: Because FileManager::getFile() doesn't guarantee that it will
-      // give us an open file, this may not be 100% reliable.
+      // Get a buffer of the file and close the file descriptor when done.
       Buf = FileMgr.getBufferForFile(NewModule->File,
                                      /*IsVolatile=*/false,
-                                     /*ShouldClose=*/false);
+                                     /*ShouldClose=*/true);
     }
 
     if (!Buf) {