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//===- InMemoryModuleCache.cpp - Cache for loaded memory buffers ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/Serialization/InMemoryModuleCache.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace clang;
InMemoryModuleCache::State
InMemoryModuleCache::getPCMState(llvm::StringRef Filename) const {
auto I = PCMs.find(Filename);
if (I == PCMs.end())
return Unknown;
if (I->second.IsFinal)
return Final;
return I->second.Buffer ? Tentative : ToBuild;
}
llvm::MemoryBuffer &
InMemoryModuleCache::addPCM(llvm::StringRef Filename,
std::unique_ptr<llvm::MemoryBuffer> Buffer) {
auto Insertion = PCMs.insert(std::make_pair(Filename, std::move(Buffer)));
assert(Insertion.second && "Already has a PCM");
return *Insertion.first->second.Buffer;
}
llvm::MemoryBuffer &
InMemoryModuleCache::addBuiltPCM(llvm::StringRef Filename,
std::unique_ptr<llvm::MemoryBuffer> Buffer) {
auto &PCM = PCMs[Filename];
assert(!PCM.IsFinal && "Trying to override finalized PCM?");
assert(!PCM.Buffer && "Trying to override tentative PCM?");
PCM.Buffer = std::move(Buffer);
PCM.IsFinal = true;
return *PCM.Buffer;
}
llvm::MemoryBuffer *
InMemoryModuleCache::lookupPCM(llvm::StringRef Filename) const {
auto I = PCMs.find(Filename);
if (I == PCMs.end())
return nullptr;
return I->second.Buffer.get();
}
bool InMemoryModuleCache::isPCMFinal(llvm::StringRef Filename) const {
return getPCMState(Filename) == Final;
}
bool InMemoryModuleCache::shouldBuildPCM(llvm::StringRef Filename) const {
return getPCMState(Filename) == ToBuild;
}
bool InMemoryModuleCache::tryToDropPCM(llvm::StringRef Filename) {
auto I = PCMs.find(Filename);
assert(I != PCMs.end() && "PCM to remove is unknown...");
auto &PCM = I->second;
assert(PCM.Buffer && "PCM to remove is scheduled to be built...");
if (PCM.IsFinal)
return true;
PCM.Buffer.reset();
return false;
}
void InMemoryModuleCache::finalizePCM(llvm::StringRef Filename) {
auto I = PCMs.find(Filename);
assert(I != PCMs.end() && "PCM to finalize is unknown...");
auto &PCM = I->second;
assert(PCM.Buffer && "Trying to finalize a dropped PCM...");
PCM.IsFinal = true;
}
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