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ConvertType.cpp
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ConvertType.cpp
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//===-- ConvertType.cpp ---------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "flang/Lower/ConvertType.h"
#include "flang/Lower/AbstractConverter.h"
#include "flang/Lower/Mangler.h"
#include "flang/Lower/PFTBuilder.h"
#include "flang/Lower/Support/Utils.h"
#include "flang/Lower/Todo.h"
#include "flang/Optimizer/Dialect/FIRType.h"
#include "flang/Semantics/tools.h"
#include "flang/Semantics/type.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/BuiltinTypes.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "flang-lower-type"
//===--------------------------------------------------------------------===//
// Intrinsic type translation helpers
//===--------------------------------------------------------------------===//
static mlir::Type genRealType(mlir::MLIRContext *context, int kind) {
if (Fortran::evaluate::IsValidKindOfIntrinsicType(
Fortran::common::TypeCategory::Real, kind)) {
switch (kind) {
case 2:
return mlir::FloatType::getF16(context);
case 3:
return mlir::FloatType::getBF16(context);
case 4:
return mlir::FloatType::getF32(context);
case 8:
return mlir::FloatType::getF64(context);
case 10:
return mlir::FloatType::getF80(context);
case 16:
return mlir::FloatType::getF128(context);
}
}
llvm_unreachable("REAL type translation not implemented");
}
template <int KIND>
int getIntegerBits() {
return Fortran::evaluate::Type<Fortran::common::TypeCategory::Integer,
KIND>::Scalar::bits;
}
static mlir::Type genIntegerType(mlir::MLIRContext *context, int kind) {
if (Fortran::evaluate::IsValidKindOfIntrinsicType(
Fortran::common::TypeCategory::Integer, kind)) {
switch (kind) {
case 1:
return mlir::IntegerType::get(context, getIntegerBits<1>());
case 2:
return mlir::IntegerType::get(context, getIntegerBits<2>());
case 4:
return mlir::IntegerType::get(context, getIntegerBits<4>());
case 8:
return mlir::IntegerType::get(context, getIntegerBits<8>());
case 16:
return mlir::IntegerType::get(context, getIntegerBits<16>());
}
}
llvm_unreachable("INTEGER kind not translated");
}
static mlir::Type genLogicalType(mlir::MLIRContext *context, int KIND) {
if (Fortran::evaluate::IsValidKindOfIntrinsicType(
Fortran::common::TypeCategory::Logical, KIND))
return fir::LogicalType::get(context, KIND);
return {};
}
static mlir::Type genCharacterType(
mlir::MLIRContext *context, int KIND,
Fortran::lower::LenParameterTy len = fir::CharacterType::unknownLen()) {
if (Fortran::evaluate::IsValidKindOfIntrinsicType(
Fortran::common::TypeCategory::Character, KIND))
return fir::CharacterType::get(context, KIND, len);
return {};
}
static mlir::Type genComplexType(mlir::MLIRContext *context, int KIND) {
if (Fortran::evaluate::IsValidKindOfIntrinsicType(
Fortran::common::TypeCategory::Complex, KIND))
return fir::ComplexType::get(context, KIND);
return {};
}
static mlir::Type
genFIRType(mlir::MLIRContext *context, Fortran::common::TypeCategory tc,
int kind,
llvm::ArrayRef<Fortran::lower::LenParameterTy> lenParameters) {
switch (tc) {
case Fortran::common::TypeCategory::Real:
return genRealType(context, kind);
case Fortran::common::TypeCategory::Integer:
return genIntegerType(context, kind);
case Fortran::common::TypeCategory::Complex:
return genComplexType(context, kind);
case Fortran::common::TypeCategory::Logical:
return genLogicalType(context, kind);
case Fortran::common::TypeCategory::Character:
if (!lenParameters.empty())
return genCharacterType(context, kind, lenParameters[0]);
return genCharacterType(context, kind);
default:
break;
}
llvm_unreachable("unhandled type category");
}
//===--------------------------------------------------------------------===//
// Symbol and expression type translation
//===--------------------------------------------------------------------===//
/// TypeBuilder translates expression and symbol type taking into account
/// their shape and length parameters. For symbols, attributes such as
/// ALLOCATABLE or POINTER are reflected in the fir type.
/// It uses evaluate::DynamicType and evaluate::Shape when possible to
/// avoid re-implementing type/shape analysis here.
/// Do not use the FirOpBuilder from the AbstractConverter to get fir/mlir types
/// since it is not guaranteed to exist yet when we lower types.
namespace {
class TypeBuilder {
public:
TypeBuilder(Fortran::lower::AbstractConverter &converter)
: converter{converter}, context{&converter.getMLIRContext()} {}
mlir::Type genExprType(const Fortran::lower::SomeExpr &expr) {
std::optional<Fortran::evaluate::DynamicType> dynamicType = expr.GetType();
if (!dynamicType)
return genTypelessExprType(expr);
Fortran::common::TypeCategory category = dynamicType->category();
mlir::Type baseType;
if (category == Fortran::common::TypeCategory::Derived) {
baseType = genDerivedType(dynamicType->GetDerivedTypeSpec());
} else {
// LOGICAL, INTEGER, REAL, COMPLEX, CHARACTER
llvm::SmallVector<Fortran::lower::LenParameterTy> params;
translateLenParameters(params, category, expr);
baseType = genFIRType(context, category, dynamicType->kind(), params);
}
std::optional<Fortran::evaluate::Shape> shapeExpr =
Fortran::evaluate::GetShape(converter.getFoldingContext(), expr);
fir::SequenceType::Shape shape;
if (shapeExpr) {
translateShape(shape, std::move(*shapeExpr));
} else {
// Shape static analysis cannot return something useful for the shape.
// Use unknown extents.
int rank = expr.Rank();
if (rank < 0)
TODO(converter.getCurrentLocation(),
"Assumed rank expression type lowering");
for (int dim = 0; dim < rank; ++dim)
shape.emplace_back(fir::SequenceType::getUnknownExtent());
}
if (!shape.empty())
return fir::SequenceType::get(shape, baseType);
return baseType;
}
template <typename A>
void translateShape(A &shape, Fortran::evaluate::Shape &&shapeExpr) {
for (Fortran::evaluate::MaybeExtentExpr extentExpr : shapeExpr) {
fir::SequenceType::Extent extent = fir::SequenceType::getUnknownExtent();
if (std::optional<std::int64_t> constantExtent =
toInt64(std::move(extentExpr)))
extent = *constantExtent;
shape.push_back(extent);
}
}
template <typename A>
std::optional<std::int64_t> toInt64(A &&expr) {
return Fortran::evaluate::ToInt64(Fortran::evaluate::Fold(
converter.getFoldingContext(), std::move(expr)));
}
mlir::Type genTypelessExprType(const Fortran::lower::SomeExpr &expr) {
return std::visit(
Fortran::common::visitors{
[&](const Fortran::evaluate::BOZLiteralConstant &) -> mlir::Type {
return mlir::NoneType::get(context);
},
[&](const Fortran::evaluate::NullPointer &) -> mlir::Type {
return fir::ReferenceType::get(mlir::NoneType::get(context));
},
[&](const Fortran::evaluate::ProcedureDesignator &proc)
-> mlir::Type {
TODO(converter.getCurrentLocation(),
"genTypelessExprType ProcedureDesignator");
},
[&](const Fortran::evaluate::ProcedureRef &) -> mlir::Type {
return mlir::NoneType::get(context);
},
[](const auto &x) -> mlir::Type {
using T = std::decay_t<decltype(x)>;
static_assert(!Fortran::common::HasMember<
T, Fortran::evaluate::TypelessExpression>,
"missing typeless expr handling in type lowering");
llvm::report_fatal_error("not a typeless expression");
},
},
expr.u);
}
mlir::Type genSymbolType(const Fortran::semantics::Symbol &symbol,
bool isAlloc = false, bool isPtr = false) {
mlir::Location loc = converter.genLocation(symbol.name());
mlir::Type ty;
// If the symbol is not the same as the ultimate one (i.e, it is host or use
// associated), all the symbol properties are the ones of the ultimate
// symbol but the volatile and asynchronous attributes that may differ. To
// avoid issues with helper functions that would not follow association
// links, the fir type is built based on the ultimate symbol. This relies
// on the fact volatile and asynchronous are not reflected in fir types.
const Fortran::semantics::Symbol &ultimate = symbol.GetUltimate();
if (const Fortran::semantics::DeclTypeSpec *type = ultimate.GetType()) {
if (const Fortran::semantics::IntrinsicTypeSpec *tySpec =
type->AsIntrinsic()) {
int kind = toInt64(Fortran::common::Clone(tySpec->kind())).value();
llvm::SmallVector<Fortran::lower::LenParameterTy> params;
translateLenParameters(params, tySpec->category(), ultimate);
ty = genFIRType(context, tySpec->category(), kind, params);
} else if (type->IsPolymorphic()) {
TODO(loc, "genSymbolType polymorphic types");
} else if (const Fortran::semantics::DerivedTypeSpec *tySpec =
type->AsDerived()) {
ty = genDerivedType(*tySpec);
} else {
fir::emitFatalError(loc, "symbol's type must have a type spec");
}
} else {
fir::emitFatalError(loc, "symbol must have a type");
}
if (ultimate.IsObjectArray()) {
auto shapeExpr = Fortran::evaluate::GetShapeHelper{
converter.getFoldingContext()}(ultimate);
if (!shapeExpr)
TODO(loc, "assumed rank symbol type lowering");
fir::SequenceType::Shape shape;
translateShape(shape, std::move(*shapeExpr));
ty = fir::SequenceType::get(shape, ty);
}
if (Fortran::semantics::IsPointer(symbol))
return fir::BoxType::get(fir::PointerType::get(ty));
if (Fortran::semantics::IsAllocatable(symbol))
return fir::BoxType::get(fir::HeapType::get(ty));
// isPtr and isAlloc are variable that were promoted to be on the
// heap or to be pointers, but they do not have Fortran allocatable
// or pointer semantics, so do not use box for them.
if (isPtr)
return fir::PointerType::get(ty);
if (isAlloc)
return fir::HeapType::get(ty);
return ty;
}
/// Does \p component has non deferred lower bounds that are not compile time
/// constant 1.
static bool componentHasNonDefaultLowerBounds(
const Fortran::semantics::Symbol &component) {
if (const auto *objDetails =
component.detailsIf<Fortran::semantics::ObjectEntityDetails>())
for (const Fortran::semantics::ShapeSpec &bounds : objDetails->shape())
if (auto lb = bounds.lbound().GetExplicit())
if (auto constant = Fortran::evaluate::ToInt64(*lb))
if (!constant || *constant != 1)
return true;
return false;
}
mlir::Type genDerivedType(const Fortran::semantics::DerivedTypeSpec &tySpec) {
std::vector<std::pair<std::string, mlir::Type>> ps;
std::vector<std::pair<std::string, mlir::Type>> cs;
const Fortran::semantics::Symbol &typeSymbol = tySpec.typeSymbol();
if (mlir::Type ty = getTypeIfDerivedAlreadyInConstruction(typeSymbol))
return ty;
auto rec = fir::RecordType::get(context,
Fortran::lower::mangle::mangleName(tySpec));
// Maintain the stack of types for recursive references.
derivedTypeInConstruction.emplace_back(typeSymbol, rec);
// Gather the record type fields.
// (1) The data components.
for (const auto &field :
Fortran::semantics::OrderedComponentIterator(tySpec)) {
// Lowering is assuming non deferred component lower bounds are always 1.
// Catch any situations where this is not true for now.
if (componentHasNonDefaultLowerBounds(field))
TODO(converter.genLocation(field.name()),
"lowering derived type components with non default lower bounds");
if (IsProcName(field))
TODO(converter.genLocation(field.name()), "procedure components");
mlir::Type ty = genSymbolType(field);
// Do not add the parent component (component of the parents are
// added and should be sufficient, the parent component would
// duplicate the fields).
if (field.test(Fortran::semantics::Symbol::Flag::ParentComp))
continue;
cs.emplace_back(field.name().ToString(), ty);
}
// (2) The LEN type parameters.
for (const auto ¶m :
Fortran::semantics::OrderParameterDeclarations(typeSymbol))
if (param->get<Fortran::semantics::TypeParamDetails>().attr() ==
Fortran::common::TypeParamAttr::Len)
ps.emplace_back(param->name().ToString(), genSymbolType(*param));
rec.finalize(ps, cs);
popDerivedTypeInConstruction();
if (!ps.empty()) {
// This type is a PDT (parametric derived type). Create the functions to
// use for allocation, dereferencing, and address arithmetic here.
TODO(converter.genLocation(typeSymbol.name()),
"parametrized derived types lowering");
}
LLVM_DEBUG(llvm::dbgs() << "derived type: " << rec << '\n');
return rec;
}
// To get the character length from a symbol, make an fold a designator for
// the symbol to cover the case where the symbol is an assumed length named
// constant and its length comes from its init expression length.
template <int Kind>
fir::SequenceType::Extent
getCharacterLengthHelper(const Fortran::semantics::Symbol &symbol) {
using TC =
Fortran::evaluate::Type<Fortran::common::TypeCategory::Character, Kind>;
auto designator = Fortran::evaluate::Fold(
converter.getFoldingContext(),
Fortran::evaluate::Expr<TC>{Fortran::evaluate::Designator<TC>{symbol}});
if (auto len = toInt64(std::move(designator.LEN())))
return *len;
return fir::SequenceType::getUnknownExtent();
}
template <typename T>
void translateLenParameters(
llvm::SmallVectorImpl<Fortran::lower::LenParameterTy> ¶ms,
Fortran::common::TypeCategory category, const T &exprOrSym) {
if (category == Fortran::common::TypeCategory::Character)
params.push_back(getCharacterLength(exprOrSym));
else if (category == Fortran::common::TypeCategory::Derived)
TODO(converter.getCurrentLocation(),
"lowering derived type length parameters");
return;
}
Fortran::lower::LenParameterTy
getCharacterLength(const Fortran::semantics::Symbol &symbol) {
const Fortran::semantics::DeclTypeSpec *type = symbol.GetType();
if (!type ||
type->category() != Fortran::semantics::DeclTypeSpec::Character ||
!type->AsIntrinsic())
llvm::report_fatal_error("not a character symbol");
int kind =
toInt64(Fortran::common::Clone(type->AsIntrinsic()->kind())).value();
switch (kind) {
case 1:
return getCharacterLengthHelper<1>(symbol);
case 2:
return getCharacterLengthHelper<2>(symbol);
case 4:
return getCharacterLengthHelper<4>(symbol);
}
llvm_unreachable("unknown character kind");
}
Fortran::lower::LenParameterTy
getCharacterLength(const Fortran::lower::SomeExpr &expr) {
// Do not use dynamic type length here. We would miss constant
// lengths opportunities because dynamic type only has the length
// if it comes from a declaration.
auto charExpr =
std::get<Fortran::evaluate::Expr<Fortran::evaluate::SomeCharacter>>(
expr.u);
if (auto constantLen = toInt64(charExpr.LEN()))
return *constantLen;
return fir::SequenceType::getUnknownExtent();
}
mlir::Type genVariableType(const Fortran::lower::pft::Variable &var) {
return genSymbolType(var.getSymbol(), var.isHeapAlloc(), var.isPointer());
}
/// Derived type can be recursive. That is, pointer components of a derived
/// type `t` have type `t`. This helper returns `t` if it is already being
/// lowered to avoid infinite loops.
mlir::Type getTypeIfDerivedAlreadyInConstruction(
const Fortran::lower::SymbolRef derivedSym) const {
for (const auto &[sym, type] : derivedTypeInConstruction)
if (sym == derivedSym)
return type;
return {};
}
void popDerivedTypeInConstruction() {
assert(!derivedTypeInConstruction.empty());
derivedTypeInConstruction.pop_back();
}
/// Stack derived type being processed to avoid infinite loops in case of
/// recursive derived types. The depth of derived types is expected to be
/// shallow (<10), so a SmallVector is sufficient.
llvm::SmallVector<std::pair<const Fortran::lower::SymbolRef, mlir::Type>>
derivedTypeInConstruction;
Fortran::lower::AbstractConverter &converter;
mlir::MLIRContext *context;
};
} // namespace
mlir::Type Fortran::lower::getFIRType(mlir::MLIRContext *context,
Fortran::common::TypeCategory tc,
int kind,
llvm::ArrayRef<LenParameterTy> params) {
return genFIRType(context, tc, kind, params);
}
mlir::Type Fortran::lower::translateDerivedTypeToFIRType(
Fortran::lower::AbstractConverter &converter,
const Fortran::semantics::DerivedTypeSpec &tySpec) {
return TypeBuilder{converter}.genDerivedType(tySpec);
}
mlir::Type Fortran::lower::translateSomeExprToFIRType(
Fortran::lower::AbstractConverter &converter, const SomeExpr &expr) {
return TypeBuilder{converter}.genExprType(expr);
}
mlir::Type Fortran::lower::translateSymbolToFIRType(
Fortran::lower::AbstractConverter &converter, const SymbolRef symbol) {
return TypeBuilder{converter}.genSymbolType(symbol);
}
mlir::Type Fortran::lower::translateVariableToFIRType(
Fortran::lower::AbstractConverter &converter,
const Fortran::lower::pft::Variable &var) {
return TypeBuilder{converter}.genVariableType(var);
}
mlir::Type Fortran::lower::convertReal(mlir::MLIRContext *context, int kind) {
return genRealType(context, kind);
}