| 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-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "clang/Serialization/InMemoryModuleCache.h" |
| 10 | #include "llvm/Support/MemoryBuffer.h" |
| 11 | |
| 12 | using namespace clang; |
| 13 | |
| 14 | InMemoryModuleCache::State |
| 15 | InMemoryModuleCache::getPCMState(llvm::StringRef Filename) const { |
| 16 | auto I = PCMs.find(Key: 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 | |
| 24 | llvm::MemoryBuffer & |
| 25 | InMemoryModuleCache::addPCM(llvm::StringRef Filename, |
| 26 | std::unique_ptr<llvm::MemoryBuffer> Buffer) { |
| 27 | auto Insertion = PCMs.insert(KV: std::make_pair(x&: Filename, y: std::move(Buffer))); |
| 28 | assert(Insertion.second && "Already has a PCM"); |
| 29 | return *Insertion.first->second.Buffer; |
| 30 | } |
| 31 | |
| 32 | llvm::MemoryBuffer & |
| 33 | InMemoryModuleCache::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 | |
| 43 | llvm::MemoryBuffer * |
| 44 | InMemoryModuleCache::lookupPCM(llvm::StringRef Filename) const { |
| 45 | auto I = PCMs.find(Key: Filename); |
| 46 | if (I == PCMs.end()) |
| 47 | return nullptr; |
| 48 | return I->second.Buffer.get(); |
| 49 | } |
| 50 | |
| 51 | bool InMemoryModuleCache::isPCMFinal(llvm::StringRef Filename) const { |
| 52 | return getPCMState(Filename) == Final; |
| 53 | } |
| 54 | |
| 55 | bool InMemoryModuleCache::shouldBuildPCM(llvm::StringRef Filename) const { |
| 56 | return getPCMState(Filename) == ToBuild; |
| 57 | } |
| 58 | |
| 59 | bool InMemoryModuleCache::tryToDropPCM(llvm::StringRef Filename) { |
| 60 | auto I = PCMs.find(Key: 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 | |
| 73 | void InMemoryModuleCache::finalizePCM(llvm::StringRef Filename) { |
| 74 | auto I = PCMs.find(Key: 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 |