1 //===----- LinkAllIR.h - Reference All VMCore Code --------------*- C++ -*-===//
2 //
3 //                      The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This header file pulls in all the object modules of the VMCore library so
11 // that tools like llc, opt, and lli can ensure they are linked with all symbols
12 // from libVMCore.a It should only be used from a tool's main program.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_LINKALLIR_H
17 #define LLVM_LINKALLIR_H
18 
19 #include "llvm/BinaryFormat/Dwarf.h"
20 #include "llvm/IR/InlineAsm.h"
21 #include "llvm/IR/Instructions.h"
22 #include "llvm/IR/LLVMContext.h"
23 #include "llvm/IR/Module.h"
24 #include "llvm/IR/Verifier.h"
25 #include "llvm/Support/DynamicLibrary.h"
26 #include "llvm/Support/MathExtras.h"
27 #include "llvm/Support/Memory.h"
28 #include "llvm/Support/Mutex.h"
29 #include "llvm/Support/Path.h"
30 #include "llvm/Support/Process.h"
31 #include "llvm/Support/Program.h"
32 #include "llvm/Support/Signals.h"
33 #include <cstdlib>
34 
35 namespace {
36   struct ForceVMCoreLinking {
ForceVMCoreLinkingForceVMCoreLinking37     ForceVMCoreLinking() {
38       // We must reference VMCore in such a way that compilers will not
39       // delete it all as dead code, even with whole program optimization,
40       // yet is effectively a NO-OP. As the compiler isn't smart enough
41       // to know that getenv() never returns -1, this will do the job.
42       if (std::getenv("bar") != (char*) -1)
43         return;
44       llvm::LLVMContext Context;
45       (void)new llvm::Module("", Context);
46       (void)new llvm::UnreachableInst(Context);
47       (void)    llvm::createVerifierPass();
48     }
49   } ForceVMCoreLinking;
50 }
51 
52 #endif
53