81 lines · cpp
1//===- InMemoryModuleCache.cpp - Cache for loaded memory buffers ----------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "clang/Serialization/InMemoryModuleCache.h"10#include "llvm/Support/MemoryBuffer.h"11 12using namespace clang;13 14InMemoryModuleCache::State15InMemoryModuleCache::getPCMState(llvm::StringRef Filename) const {16 auto I = PCMs.find(Filename);17 if (I == PCMs.end())18 return Unknown;19 if (I->second.IsFinal)20 return Final;21 return I->second.Buffer ? Tentative : ToBuild;22}23 24llvm::MemoryBuffer &25InMemoryModuleCache::addPCM(llvm::StringRef Filename,26 std::unique_ptr<llvm::MemoryBuffer> Buffer) {27 auto Insertion = PCMs.insert(std::make_pair(Filename, std::move(Buffer)));28 assert(Insertion.second && "Already has a PCM");29 return *Insertion.first->second.Buffer;30}31 32llvm::MemoryBuffer &33InMemoryModuleCache::addBuiltPCM(llvm::StringRef Filename,34 std::unique_ptr<llvm::MemoryBuffer> Buffer) {35 auto &PCM = PCMs[Filename];36 assert(!PCM.IsFinal && "Trying to override finalized PCM?");37 assert(!PCM.Buffer && "Trying to override tentative PCM?");38 PCM.Buffer = std::move(Buffer);39 PCM.IsFinal = true;40 return *PCM.Buffer;41}42 43llvm::MemoryBuffer *44InMemoryModuleCache::lookupPCM(llvm::StringRef Filename) const {45 auto I = PCMs.find(Filename);46 if (I == PCMs.end())47 return nullptr;48 return I->second.Buffer.get();49}50 51bool InMemoryModuleCache::isPCMFinal(llvm::StringRef Filename) const {52 return getPCMState(Filename) == Final;53}54 55bool InMemoryModuleCache::shouldBuildPCM(llvm::StringRef Filename) const {56 return getPCMState(Filename) == ToBuild;57}58 59bool InMemoryModuleCache::tryToDropPCM(llvm::StringRef Filename) {60 auto I = PCMs.find(Filename);61 assert(I != PCMs.end() && "PCM to remove is unknown...");62 63 auto &PCM = I->second;64 assert(PCM.Buffer && "PCM to remove is scheduled to be built...");65 66 if (PCM.IsFinal)67 return true;68 69 PCM.Buffer.reset();70 return false;71}72 73void InMemoryModuleCache::finalizePCM(llvm::StringRef Filename) {74 auto I = PCMs.find(Filename);75 assert(I != PCMs.end() && "PCM to finalize is unknown...");76 77 auto &PCM = I->second;78 assert(PCM.Buffer && "Trying to finalize a dropped PCM...");79 PCM.IsFinal = true;80}81