LinkAllCodegenComponents.h revision 360660 
1//===- llvm/Codegen/LinkAllCodegenComponents.h ------------------*- 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 codegen related passes for tools like lli and
10// llc that need this functionality.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CODEGEN_LINKALLCODEGENCOMPONENTS_H
15#define LLVM_CODEGEN_LINKALLCODEGENCOMPONENTS_H
16
17#include "llvm/CodeGen/BuiltinGCs.h"
18#include "llvm/CodeGen/Passes.h"
19#include "llvm/CodeGen/SchedulerRegistry.h"
20#include "llvm/Target/TargetMachine.h"
21#include <cstdlib>
22
23namespace {
24  struct ForceCodegenLinking {
25    ForceCodegenLinking() {
26      // We must reference the passes in such a way that compilers will not
27      // delete it all as dead code, even with whole program optimization,
28      // yet is effectively a NO-OP. As the compiler isn't smart enough
29      // to know that getenv() never returns -1, this will do the job.
30      if (std::getenv("bar") != (char*) -1)
31        return;
32
33      (void) llvm::createFastRegisterAllocator();
34      (void) llvm::createBasicRegisterAllocator();
35      (void) llvm::createGreedyRegisterAllocator();
36      (void) llvm::createDefaultPBQPRegisterAllocator();
37
38      llvm::linkAllBuiltinGCs();
39
40      (void) llvm::createBURRListDAGScheduler(nullptr,
41                                              llvm::CodeGenOpt::Default);
42      (void) llvm::createSourceListDAGScheduler(nullptr,
43                                                llvm::CodeGenOpt::Default);
44      (void) llvm::createHybridListDAGScheduler(nullptr,
45                                                llvm::CodeGenOpt::Default);
46      (void) llvm::createFastDAGScheduler(nullptr, llvm::CodeGenOpt::Default);
47      (void) llvm::createDefaultScheduler(nullptr, llvm::CodeGenOpt::Default);
48      (void) llvm::createVLIWDAGScheduler(nullptr, llvm::CodeGenOpt::Default);
49
50    }
51  } ForceCodegenLinking; // Force link by creating a global definition.
52}
53
54#endif
55