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
34namespace {
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