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  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/Passes.h"
  18. #include "llvm/CodeGen/SchedulerRegistry.h"
  19. #include "llvm/Target/TargetMachine.h"
  20. #include <cstdlib>
  21.  
  22. namespace {
  23.   struct ForceCodegenLinking {
  24.     ForceCodegenLinking() {
  25.       // We must reference the passes in such a way that compilers will not
  26.       // delete it all as dead code, even with whole program optimization,
  27.       // yet is effectively a NO-OP. As the compiler isn't smart enough
  28.       // to know that getenv() never returns -1, this will do the job.
  29.       // This is so that globals in the translation units where these functions
  30.       // are defined are forced to be initialized, populating various
  31.       // registries.
  32.       if (std::getenv("bar") != (char*) -1)
  33.         return;
  34.  
  35.       (void) llvm::createFastRegisterAllocator();
  36.       (void) llvm::createBasicRegisterAllocator();
  37.       (void) llvm::createGreedyRegisterAllocator();
  38.       (void) llvm::createDefaultPBQPRegisterAllocator();
  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.