| 1 | //===----- LinkAllIR.h - Reference All VMCore Code --------------*- 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 header file pulls in all the object modules of the VMCore library so |
| 10 | // that tools like llc, opt, and lli can ensure they are linked with all symbols |
| 11 | // from libVMCore.a It should only be used from a tool's main program. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #ifndef LLVM_LINKALLIR_H |
| 16 | #define LLVM_LINKALLIR_H |
| 17 | |
| 18 | #include "llvm/BinaryFormat/Dwarf.h" |
| 19 | #include "llvm/IR/InlineAsm.h" |
| 20 | #include "llvm/IR/Instructions.h" |
| 21 | #include "llvm/IR/LLVMContext.h" |
| 22 | #include "llvm/IR/Module.h" |
| 23 | #include "llvm/IR/Verifier.h" |
| 24 | #include "llvm/Support/DynamicLibrary.h" |
| 25 | #include "llvm/Support/MathExtras.h" |
| 26 | #include "llvm/Support/Memory.h" |
| 27 | #include "llvm/Support/Mutex.h" |
| 28 | #include "llvm/Support/Path.h" |
| 29 | #include "llvm/Support/Process.h" |
| 30 | #include "llvm/Support/Program.h" |
| 31 | #include "llvm/Support/Signals.h" |
| 32 | #include <cstdlib> |
| 33 | |
| 34 | namespace { |
| 35 | struct ForceVMCoreLinking { |
| 36 | ForceVMCoreLinking() { |
| 37 | // We must reference VMCore in such a way that compilers will not |
| 38 | // delete it all as dead code, even with whole program optimization, |
| 39 | // yet is effectively a NO-OP. As the compiler isn't smart enough |
| 40 | // to know that getenv() never returns -1, this will do the job. |
| 41 | // This is so that globals in the translation units where these functions |
| 42 | // are defined are forced to be initialized, populating various |
| 43 | // registries. |
| 44 | if (std::getenv(name: "bar") != (char*) -1) |
| 45 | return; |
| 46 | llvm::LLVMContext Context; |
| 47 | (void)new llvm::Module("", Context); |
| 48 | (void)new llvm::UnreachableInst(Context); |
| 49 | (void) llvm::createVerifierPass(); |
| 50 | } |
| 51 | } ForceVMCoreLinking; |
| 52 | } |
| 53 | |
| 54 | #endif |
| 55 |