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| 14 | pmbaty | 1 | //===-- MCJIT.h - MC-Based Just-In-Time Execution Engine --------*- 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 | // This file forces the MCJIT to link in on certain operating systems. |
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| 10 | // (Windows). |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |||
| 14 | #ifndef LLVM_EXECUTIONENGINE_MCJIT_H |
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| 15 | #define LLVM_EXECUTIONENGINE_MCJIT_H |
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| 16 | |||
| 17 | #include "llvm/ExecutionEngine/ExecutionEngine.h" |
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| 18 | #include <cstdlib> |
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| 19 | |||
| 20 | extern "C" void LLVMLinkInMCJIT(); |
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| 21 | |||
| 22 | namespace { |
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| 23 | struct ForceMCJITLinking { |
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| 24 | ForceMCJITLinking() { |
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| 25 | // We must reference MCJIT in such a way that compilers will not |
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| 26 | // delete it all as dead code, even with whole program optimization, |
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| 27 | // yet is effectively a NO-OP. As the compiler isn't smart enough |
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| 28 | // to know that getenv() never returns -1, this will do the job. |
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| 29 | // This is so that globals in the translation units where these functions |
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| 30 | // are defined are forced to be initialized, populating various |
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| 31 | // registries. |
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| 32 | if (std::getenv("bar") != (char*) -1) |
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| 33 | return; |
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| 34 | |||
| 35 | LLVMLinkInMCJIT(); |
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| 36 | } |
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| 37 | } ForceMCJITLinking; |
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| 38 | } |
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| 39 | |||
| 40 | #endif |