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| 1 | //===-- ConvertConstant.h -- lowering of constants --------------*- 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 | // Coding style: https://mlir.llvm.org/getting_started/DeveloperGuide/ |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | /// |
| 13 | /// Implements the conversion from evaluate::Constant to FIR. |
| 14 | /// |
| 15 | //===----------------------------------------------------------------------===// |
| 16 | |
| 17 | #ifndef FORTRAN_LOWER_CONVERTCONSTANT_H |
| 18 | #define FORTRAN_LOWER_CONVERTCONSTANT_H |
| 19 | |
| 20 | #include "flang/Evaluate/constant.h" |
| 21 | #include "flang/Lower/Support/Utils.h" |
| 22 | #include "flang/Optimizer/Builder/BoxValue.h" |
| 23 | #include "flang/Optimizer/Builder/FIRBuilder.h" |
| 24 | |
| 25 | namespace Fortran::lower { |
| 26 | class AbstractConverter; |
| 27 | |
| 28 | /// Class to lower evaluate::Constant to fir::ExtendedValue. |
| 29 | template <typename T> |
| 30 | class ConstantBuilder { |
| 31 | public: |
| 32 | /// Lower \p constant into a fir::ExtendedValue. |
| 33 | /// If \p outlineBigConstantsInReadOnlyMemory is set, character, derived |
| 34 | /// type, and array constants will be lowered into read only memory |
| 35 | /// fir.global, and the resulting fir::ExtendedValue will contain the address |
| 36 | /// of the fir.global. This option should not be set if the constant is being |
| 37 | /// lowered while the builder is already in a fir.global body because |
| 38 | /// fir.global initialization body cannot contain code manipulating memory |
| 39 | /// (e.g. fir.load/fir.store...). |
| 40 | static fir::ExtendedValue gen(Fortran::lower::AbstractConverter &converter, |
| 41 | mlir::Location loc, |
| 42 | const evaluate::Constant<T> &constant, |
| 43 | bool outlineBigConstantsInReadOnlyMemory); |
| 44 | }; |
| 45 | using namespace evaluate; |
| 46 | FOR_EACH_SPECIFIC_TYPE(extern template class ConstantBuilder, ) |
| 47 | |
| 48 | template <typename T> |
| 49 | fir::ExtendedValue convertConstant(Fortran::lower::AbstractConverter &converter, |
| 50 | mlir::Location loc, |
| 51 | const evaluate::Constant<T> &constant, |
| 52 | bool outlineBigConstantsInReadOnlyMemory) { |
| 53 | return ConstantBuilder<T>::gen(converter, loc, constant, |
| 54 | outlineBigConstantsInReadOnlyMemory); |
| 55 | } |
| 56 | |
| 57 | /// Create a fir.global array with a dense attribute containing the value of |
| 58 | /// \p initExpr. |
| 59 | /// Using a dense attribute allows faster MLIR compilation times compared to |
| 60 | /// creating an initialization body for the initial value. However, a dense |
| 61 | /// attribute can only be created if initExpr is a non-empty rank 1 numerical or |
| 62 | /// logical Constant<T>. Otherwise, the value returned will be null. |
| 63 | fir::GlobalOp tryCreatingDenseGlobal(fir::FirOpBuilder &builder, |
| 64 | mlir::Location loc, mlir::Type symTy, |
| 65 | llvm::StringRef globalName, |
| 66 | mlir::StringAttr linkage, bool isConst, |
| 67 | const Fortran::lower::SomeExpr &initExpr); |
| 68 | |
| 69 | /// Lower a StructureConstructor that must be lowered in read only data although |
| 70 | /// it may not be wrapped into a Constant<T> (this may be the case for derived |
| 71 | /// type descriptor compiler generated data that is not fully compliant with |
| 72 | /// Fortran constant expression but can and must still be lowered into read only |
| 73 | /// memory). |
| 74 | fir::ExtendedValue |
| 75 | genInlinedStructureCtorLit(Fortran::lower::AbstractConverter &converter, |
| 76 | mlir::Location loc, |
| 77 | const Fortran::evaluate::StructureConstructor &ctor); |
| 78 | |
| 79 | } // namespace Fortran::lower |
| 80 | |
| 81 | #endif // FORTRAN_LOWER_CONVERTCONSTANT_H |
| 82 |
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