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//===- 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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