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c84d8e8f1c
This PR adds new `ModuleCache` interface to Clang's implicitly-built modules machinery. The main motivation for this change is to create a second implementation that uses a more efficient kind of `llvm::AdvisoryLock` during dependency scanning. In addition to the lock abstraction, the `ModuleCache` interface also manages the existing `InMemoryModuleCache` instance. I found that compared to keeping these separate/independent, the code is a bit simpler now, since these are two tightly coupled concepts. I can envision a more efficient implementation of the `InMemoryModuleCache` for the single-process case too, which will be much easier to implement with the current setup. This is not intended to be a functional change.
45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Serialization/ModuleCache.h"
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#include "clang/Serialization/InMemoryModuleCache.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/LockFileManager.h"
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#include "llvm/Support/Path.h"
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using namespace clang;
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namespace {
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class CrossProcessModuleCache : public ModuleCache {
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InMemoryModuleCache InMemory;
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public:
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void prepareForGetLock(StringRef ModuleFilename) override {
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// FIXME: Do this in LockFileManager and only if the directory doesn't
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// exist.
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StringRef Dir = llvm::sys::path::parent_path(ModuleFilename);
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llvm::sys::fs::create_directories(Dir);
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}
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std::unique_ptr<llvm::AdvisoryLock>
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getLock(StringRef ModuleFilename) override {
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return std::make_unique<llvm::LockFileManager>(ModuleFilename);
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}
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InMemoryModuleCache &getInMemoryModuleCache() override { return InMemory; }
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const InMemoryModuleCache &getInMemoryModuleCache() const override {
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return InMemory;
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}
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};
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} // namespace
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IntrusiveRefCntPtr<ModuleCache> clang::createCrossProcessModuleCache() {
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return llvm::makeIntrusiveRefCnt<CrossProcessModuleCache>();
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}
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