LLVM  6.0.0svn
LinkAllIR.h
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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 
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"
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 {
37  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;
45  (void)new llvm::Module("", Context);
46  (void)new llvm::UnreachableInst(Context);
47  (void) llvm::createVerifierPass();
48  }
49  } ForceVMCoreLinking;
50 }
51 
52 #endif
LLVMContext & Context
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:63
FunctionPass * createVerifierPass(bool FatalErrors=true)
Definition: Verifier.cpp:4977
This is an important class for using LLVM in a threaded context.
Definition: LLVMContext.h:69
This function has undefined behavior.
Module.h This file contains the declarations for the Module class.
This file contains constants used for implementing Dwarf debug support.
Provides a library for accessing information about this process and other processes on the operating ...