Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- llvm/Codegen/LinkAllCodegenComponents.h ------------------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

// This header file pulls in all codegen related passes for tools like lli and

// llc that need this functionality.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_LINKALLCODEGENCOMPONENTS_H

#define LLVM_CODEGEN_LINKALLCODEGENCOMPONENTS_H

#include "llvm/CodeGen/Passes.h"

#include "llvm/CodeGen/SchedulerRegistry.h"

#include "llvm/Target/TargetMachine.h"

#include <cstdlib>

namespace {

  struct ForceCodegenLinking {

    ForceCodegenLinking() {

      // We must reference the passes in such a way that compilers will not

      // delete it all as dead code, even with whole program optimization,

      // yet is effectively a NO-OP. As the compiler isn't smart enough

      // to know that getenv() never returns -1, this will do the job.

      // This is so that globals in the translation units where these functions

      // are defined are forced to be initialized, populating various

      // registries.

      if (std::getenv("bar") != (char*) -1)

        return;

      (void) llvm::createFastRegisterAllocator();

      (void) llvm::createBasicRegisterAllocator();

      (void) llvm::createGreedyRegisterAllocator();

      (void) llvm::createDefaultPBQPRegisterAllocator();

      (void) llvm::createBURRListDAGScheduler(nullptr,

                                              llvm::CodeGenOpt::Default);

      (void) llvm::createSourceListDAGScheduler(nullptr,

                                                llvm::CodeGenOpt::Default);

      (void) llvm::createHybridListDAGScheduler(nullptr,

                                                llvm::CodeGenOpt::Default);

      (void) llvm::createFastDAGScheduler(nullptr, llvm::CodeGenOpt::Default);

      (void) llvm::createDefaultScheduler(nullptr, llvm::CodeGenOpt::Default);

      (void) llvm::createVLIWDAGScheduler(nullptr, llvm::CodeGenOpt::Default);

    }

  } ForceCodegenLinking; // Force link by creating a global definition.

}

#endif