| 1 | //===- CommonLinkerContext.h ------------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // Entry point for all global state in lldCommon. The objective is for LLD to be |
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| 10 | // used "as a library" in a thread-safe manner. |
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| 11 | // |
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| 12 | // Instead of program-wide globals or function-local statics, we prefer |
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| 13 | // aggregating all "global" states into a heap-based structure |
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| 14 | // (CommonLinkerContext). This also achieves deterministic initialization & |
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| 15 | // shutdown for all "global" states. |
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| 16 | // |
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| 17 | //===----------------------------------------------------------------------===// |
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| 18 | |
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| 19 | #ifndef LLD_COMMON_COMMONLINKINGCONTEXT_H |
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| 20 | #define LLD_COMMON_COMMONLINKINGCONTEXT_H |
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| 21 | |
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| 22 | #include "lld/Common/ErrorHandler.h" |
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| 23 | #include "lld/Common/Memory.h" |
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| 24 | #include "llvm/Support/StringSaver.h" |
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| 25 | |
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| 26 | namespace llvm { |
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| 27 | class raw_ostream; |
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| 28 | } // namespace llvm |
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| 29 | |
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| 30 | namespace lld { |
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| 31 | struct SpecificAllocBase; |
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| 32 | class CommonLinkerContext { |
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| 33 | public: |
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| 34 | CommonLinkerContext(); |
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| 35 | virtual ~CommonLinkerContext(); |
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| 36 | |
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| 37 | static void destroy(); |
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| 38 | |
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| 39 | llvm::BumpPtrAllocator bAlloc; |
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| 40 | llvm::StringSaver saver{bAlloc}; |
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| 41 | llvm::DenseMap<void *, SpecificAllocBase *> instances; |
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| 42 | |
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| 43 | ErrorHandler e; |
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| 44 | }; |
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| 45 | |
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| 46 | // Retrieve the global state. Currently only one state can exist per process, |
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| 47 | // but in the future we plan on supporting an arbitrary number of LLD instances |
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| 48 | // in a single process. |
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| 49 | CommonLinkerContext &commonContext(); |
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| 50 | |
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| 51 | template <typename T = CommonLinkerContext> T &context() { |
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| 52 | return static_cast<T &>(commonContext()); |
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| 53 | } |
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| 54 | |
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| 55 | bool hasContext(); |
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| 56 | |
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| 57 | inline llvm::StringSaver &saver() { return context().saver; } |
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| 58 | inline llvm::BumpPtrAllocator &bAlloc() { return context().bAlloc; } |
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| 59 | } // namespace lld |
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| 60 | |
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| 61 | #endif |
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| 62 | |
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