include/llvm/CodeGen/LinkAllCodegenComponents.h

   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
  23 namespace {
  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