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1 //===- Caching.h - LLVM Link Time Optimizer Configuration -----------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file defines the localCache function, which allows clients to add a
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11 // filesystem cache to ThinLTO.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_LTO_CACHING_H
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16 #define LLVM_LTO_CACHING_H
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17
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18 #include "llvm/LTO/LTO.h"
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19 #include <string>
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20
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21 namespace llvm {
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22 namespace lto {
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23
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24 /// This type defines the callback to add a pre-existing native object file
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25 /// (e.g. in a cache).
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26 ///
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27 /// Path is generally expected to be a valid path for the file at the point when
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28 /// the AddBufferFn function is called, but clients should prefer to access MB
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29 /// directly in order to avoid a potential race condition.
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30 ///
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31 /// Buffer callbacks must be thread safe.
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32 typedef std::function<void(unsigned Task, std::unique_ptr<MemoryBuffer> MB,
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33 StringRef Path)>
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34 AddBufferFn;
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35
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36 /// Create a local file system cache which uses the given cache directory and
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37 /// file callback. This function also creates the cache directory if it does not
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38 /// already exist.
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39 Expected<NativeObjectCache> localCache(StringRef CacheDirectoryPath,
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40 AddBufferFn AddBuffer);
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41
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42 } // namespace lto
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43 } // namespace llvm
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44
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45 #endif
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