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14 | pmbaty | 1 | //===- CommonLinkerContext.h ------------------------------------*- C++ -*-===// |
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 | |||
19 | #ifndef LLD_COMMON_COMMONLINKINGCONTEXT_H |
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20 | #define LLD_COMMON_COMMONLINKINGCONTEXT_H |
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21 | |||
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 | |||
26 | namespace llvm { |
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27 | class raw_ostream; |
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28 | } // namespace llvm |
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29 | |||
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 | |||
37 | static void destroy(); |
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38 | |||
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 | |||
43 | ErrorHandler e; |
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44 | }; |
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45 | |||
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 | |||
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 | |||
55 | bool hasContext(); |
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56 | |||
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 | |||
61 | #endif |