LowerModule.h

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//===--- LowerModule.h - Abstracts CIR's module lowering --------*- 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 file partially mimics clang/lib/CodeGen/CodeGenModule.h. The queries are
// adapted to operate on the CIR dialect, however.
//
//===----------------------------------------------------------------------===//
 
#ifndef CLANG_LIB_CIR_DIALECT_TRANSFORMS_TARGETLOWERING_LOWERMODULE_H
#define CLANG_LIB_CIR_DIALECT_TRANSFORMS_TARGETLOWERING_LOWERMODULE_H
 
#include "CIRCXXABI.h"
#include "TargetLoweringInfo.h"
#include "mlir/IR/BuiltinOps.h"
#include "clang/Basic/CodeGenOptions.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/CIR/Dialect/IR/CIRDialect.h"
#include "llvm/ADT/StringRef.h"
#include <memory>
 
namespace cir {
 
class LowerModule {
  mlir::ModuleOp module;
  const clang::LangOptions langOpts;
  const std::unique_ptr<clang::TargetInfo> target;
  std::unique_ptr<TargetLoweringInfo> targetLoweringInfo;
  std::unique_ptr<CIRCXXABI> abi;
 
public:
  LowerModule(clang::LangOptions langOpts, clang::CodeGenOptions codeGenOpts,
              mlir::ModuleOp &module,
              std::unique_ptr<clang::TargetInfo> target);
  ~LowerModule() = default;
 
  // The lowering-relevant LangOptions, populated by createLowerModule() from
  // the module's #cir.lowering_options attribute when present (so a
  // reloaded .cir lowers the same way without a live clang::LangOptions),
  // otherwise left at their defaults.
  const clang::LangOptions &getLangOpts() const { return langOpts; }
 
  clang::TargetCXXABI::Kind getCXXABIKind() const {
    return langOpts.CXXABI.value_or(target->getCXXABI().getKind());
  }
 
  CIRCXXABI &getCXXABI() const { return *abi; }
 
  // FIXME remove this once all ABIs are supported.
  bool hasCXXABI() const { return abi != nullptr; }
 
  const clang::TargetInfo &getTarget() const { return *target; }
  mlir::MLIRContext *getMLIRContext() { return module.getContext(); }
 
  const TargetLoweringInfo &getTargetLoweringInfo();
};
 
std::unique_ptr<LowerModule> createLowerModule(mlir::ModuleOp module);
 
} // namespace cir
 
#endif // CLANG_LIB_CIR_DIALECT_TRANSFORMS_TARGETLOWERING_LOWERMODULE_H