From 7442d6faa2719e4e7d33a7021c406c5a4facd74d Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sun, 16 Apr 2017 16:02:28 +0000
Subject: Vendor import of clang trunk r300422:
 https://llvm.org/svn/llvm-project/cfe/trunk@300422

---
 lib/Basic/MemoryBufferCache.cpp | 48 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 lib/Basic/MemoryBufferCache.cpp

(limited to 'lib/Basic/MemoryBufferCache.cpp')

diff --git a/lib/Basic/MemoryBufferCache.cpp b/lib/Basic/MemoryBufferCache.cpp
new file mode 100644
index 0000000000000..c1fc571ec9b33
--- /dev/null
+++ b/lib/Basic/MemoryBufferCache.cpp
@@ -0,0 +1,48 @@
+//===- MemoryBufferCache.cpp - Cache for loaded memory buffers ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/MemoryBufferCache.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+using namespace clang;
+
+llvm::MemoryBuffer &
+MemoryBufferCache::addBuffer(llvm::StringRef Filename,
+                             std::unique_ptr<llvm::MemoryBuffer> Buffer) {
+  auto Insertion =
+      Buffers.insert({Filename, BufferEntry{std::move(Buffer), NextIndex++}});
+  assert(Insertion.second && "Already has a buffer");
+  return *Insertion.first->second.Buffer;
+}
+
+llvm::MemoryBuffer *MemoryBufferCache::lookupBuffer(llvm::StringRef Filename) {
+  auto I = Buffers.find(Filename);
+  if (I == Buffers.end())
+    return nullptr;
+  return I->second.Buffer.get();
+}
+
+bool MemoryBufferCache::isBufferFinal(llvm::StringRef Filename) {
+  auto I = Buffers.find(Filename);
+  if (I == Buffers.end())
+    return false;
+  return I->second.Index < FirstRemovableIndex;
+}
+
+bool MemoryBufferCache::tryToRemoveBuffer(llvm::StringRef Filename) {
+  auto I = Buffers.find(Filename);
+  assert(I != Buffers.end() && "No buffer to remove...");
+  if (I->second.Index < FirstRemovableIndex)
+    return true;
+
+  Buffers.erase(I);
+  return false;
+}
+
+void MemoryBufferCache::finalizeCurrentBuffers() { FirstRemovableIndex = NextIndex; }
-- 
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