1 | //===-- MCJIT.h - MC-Based Just-In-Time Execution Engine --------*- C++ -*-===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file forces the MCJIT to link in on certain operating systems. |
10 | // (Windows). |
11 | // |
12 | //===----------------------------------------------------------------------===// |
13 | |
14 | #ifndef LLVM_EXECUTIONENGINE_MCJIT_H |
15 | #define LLVM_EXECUTIONENGINE_MCJIT_H |
16 | |
17 | #include "llvm/ExecutionEngine/ExecutionEngine.h" |
18 | #include <cstdlib> |
19 | |
20 | extern "C" void LLVMLinkInMCJIT(); |
21 | |
22 | namespace { |
23 | struct ForceMCJITLinking { |
24 | ForceMCJITLinking() { |
25 | // We must reference MCJIT in such a way that compilers will not |
26 | // delete it all as dead code, even with whole program optimization, |
27 | // yet is effectively a NO-OP. As the compiler isn't smart enough |
28 | // to know that getenv() never returns -1, this will do the job. |
29 | // This is so that globals in the translation units where these functions |
30 | // are defined are forced to be initialized, populating various |
31 | // registries. |
32 | if (std::getenv(name: "bar" ) != (char*) -1) |
33 | return; |
34 | |
35 | LLVMLinkInMCJIT(); |
36 | } |
37 | } ForceMCJITLinking; |
38 | } |
39 | |
40 | #endif |
41 | |