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[flang][NFC] Extract TypeConverter from header file
Extract the type converter definitions into its own .cpp file so the type converter can be used by passes. Reviewed By: PeteSteinfeld Differential Revision: https://reviews.llvm.org/D147824
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//===-- TypeConverter.cpp -- type conversion --------------------*- 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 | ||
// | ||
//===----------------------------------------------------------------------===// | ||
// | ||
// Coding style: https://mlir.llvm.org/getting_started/DeveloperGuide/ | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#define DEBUG_TYPE "flang-type-conversion" | ||
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#include "TypeConverter.h" | ||
#include "DescriptorModel.h" | ||
#include "TBAABuilder.h" | ||
#include "Target.h" | ||
#include "flang/Optimizer/Builder/Todo.h" // remove when TODO's are done | ||
#include "flang/Optimizer/Dialect/FIRType.h" | ||
#include "flang/Optimizer/Dialect/Support/FIRContext.h" | ||
#include "flang/Optimizer/Dialect/Support/KindMapping.h" | ||
#include "mlir/Conversion/LLVMCommon/TypeConverter.h" | ||
#include "llvm/Support/Debug.h" | ||
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namespace fir { | ||
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LLVMTypeConverter::LLVMTypeConverter(mlir::ModuleOp module, bool applyTBAA) | ||
: mlir::LLVMTypeConverter(module.getContext(), | ||
[&] { | ||
mlir::LowerToLLVMOptions options( | ||
module.getContext()); | ||
options.useOpaquePointers = false; | ||
return options; | ||
}()), | ||
kindMapping(getKindMapping(module)), | ||
specifics(CodeGenSpecifics::get(module.getContext(), | ||
getTargetTriple(module), | ||
getKindMapping(module))), | ||
tbaaBuilder(module, applyTBAA) { | ||
LLVM_DEBUG(llvm::dbgs() << "FIR type converter\n"); | ||
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// Each conversion should return a value of type mlir::Type. | ||
addConversion([&](BoxType box) { return convertBoxType(box); }); | ||
addConversion([&](BoxCharType boxchar) { | ||
LLVM_DEBUG(llvm::dbgs() << "type convert: " << boxchar << '\n'); | ||
return convertType(specifics->boxcharMemoryType(boxchar.getEleTy())); | ||
}); | ||
addConversion([&](BoxProcType boxproc) { | ||
// TODO: Support for this type will be added later when the Fortran 2003 | ||
// procedure pointer feature is implemented. | ||
return std::nullopt; | ||
}); | ||
addConversion( | ||
[&](fir::ClassType classTy) { return convertBoxType(classTy); }); | ||
addConversion( | ||
[&](fir::CharacterType charTy) { return convertCharType(charTy); }); | ||
addConversion( | ||
[&](fir::ComplexType cmplx) { return convertComplexType(cmplx); }); | ||
addConversion([&](fir::FieldType field) { | ||
// Convert to i32 because of LLVM GEP indexing restriction. | ||
return mlir::IntegerType::get(field.getContext(), 32); | ||
}); | ||
addConversion([&](HeapType heap) { return convertPointerLike(heap); }); | ||
addConversion([&](fir::IntegerType intTy) { | ||
return mlir::IntegerType::get( | ||
&getContext(), kindMapping.getIntegerBitsize(intTy.getFKind())); | ||
}); | ||
addConversion([&](fir::LenType field) { | ||
// Get size of len paramter from the descriptor. | ||
return getModel<Fortran::runtime::typeInfo::TypeParameterValue>()( | ||
&getContext()); | ||
}); | ||
addConversion([&](fir::LogicalType boolTy) { | ||
return mlir::IntegerType::get( | ||
&getContext(), kindMapping.getLogicalBitsize(boolTy.getFKind())); | ||
}); | ||
addConversion([&](fir::LLVMPointerType pointer) { | ||
return convertPointerLike(pointer); | ||
}); | ||
addConversion( | ||
[&](fir::PointerType pointer) { return convertPointerLike(pointer); }); | ||
addConversion([&](fir::RecordType derived, | ||
llvm::SmallVectorImpl<mlir::Type> &results, | ||
llvm::ArrayRef<mlir::Type> callStack) { | ||
return convertRecordType(derived, results, callStack); | ||
}); | ||
addConversion( | ||
[&](fir::RealType real) { return convertRealType(real.getFKind()); }); | ||
addConversion( | ||
[&](fir::ReferenceType ref) { return convertPointerLike(ref); }); | ||
addConversion([&](fir::SequenceType sequence) { | ||
return convertSequenceType(sequence); | ||
}); | ||
addConversion([&](fir::TypeDescType tdesc) { | ||
return convertTypeDescType(tdesc.getContext()); | ||
}); | ||
addConversion([&](fir::VectorType vecTy) { | ||
return mlir::VectorType::get(llvm::ArrayRef<int64_t>(vecTy.getLen()), | ||
convertType(vecTy.getEleTy())); | ||
}); | ||
addConversion([&](mlir::TupleType tuple) { | ||
LLVM_DEBUG(llvm::dbgs() << "type convert: " << tuple << '\n'); | ||
llvm::SmallVector<mlir::Type> members; | ||
for (auto mem : tuple.getTypes()) { | ||
// Prevent fir.box from degenerating to a pointer to a descriptor in the | ||
// context of a tuple type. | ||
if (auto box = mem.dyn_cast<fir::BaseBoxType>()) | ||
members.push_back(convertBoxTypeAsStruct(box)); | ||
else | ||
members.push_back(convertType(mem).cast<mlir::Type>()); | ||
} | ||
return mlir::LLVM::LLVMStructType::getLiteral(&getContext(), members, | ||
/*isPacked=*/false); | ||
}); | ||
addConversion([&](mlir::NoneType none) { | ||
return mlir::LLVM::LLVMStructType::getLiteral( | ||
none.getContext(), std::nullopt, /*isPacked=*/false); | ||
}); | ||
// FIXME: https://reviews.llvm.org/D82831 introduced an automatic | ||
// materialization of conversion around function calls that is not working | ||
// well with fir lowering to llvm (incorrect llvm.mlir.cast are inserted). | ||
// Workaround until better analysis: register a handler that does not insert | ||
// any conversions. | ||
addSourceMaterialization( | ||
[&](mlir::OpBuilder &builder, mlir::Type resultType, | ||
mlir::ValueRange inputs, | ||
mlir::Location loc) -> std::optional<mlir::Value> { | ||
if (inputs.size() != 1) | ||
return std::nullopt; | ||
return inputs[0]; | ||
}); | ||
// Similar FIXME workaround here (needed for compare.fir/select-type.fir | ||
// as well as rebox-global.fir tests). This is needed to cope with the | ||
// the fact that codegen does not lower some operation results to the LLVM | ||
// type produced by this LLVMTypeConverter. For instance, inside FIR | ||
// globals, fir.box are lowered to llvm.struct, while the fir.box type | ||
// conversion translates it into an llvm.ptr<llvm.struct<>> because | ||
// descriptors are manipulated in memory outside of global initializers | ||
// where this is not possible. Hence, MLIR inserts | ||
// builtin.unrealized_conversion_cast after the translation of operations | ||
// producing fir.box in fir.global codegen. addSourceMaterialization and | ||
// addTargetMaterialization allow ignoring these ops and removing them | ||
// after codegen assuming the type discrepencies are intended (like for | ||
// fir.box inside globals). | ||
addTargetMaterialization( | ||
[&](mlir::OpBuilder &builder, mlir::Type resultType, | ||
mlir::ValueRange inputs, | ||
mlir::Location loc) -> std::optional<mlir::Value> { | ||
if (inputs.size() != 1) | ||
return std::nullopt; | ||
return inputs[0]; | ||
}); | ||
} | ||
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// i32 is used here because LLVM wants i32 constants when indexing into struct | ||
// types. Indexing into other aggregate types is more flexible. | ||
mlir::Type LLVMTypeConverter::offsetType() { | ||
return mlir::IntegerType::get(&getContext(), 32); | ||
} | ||
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// i64 can be used to index into aggregates like arrays | ||
mlir::Type LLVMTypeConverter::indexType() { | ||
return mlir::IntegerType::get(&getContext(), 64); | ||
} | ||
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// fir.type<name(p : TY'...){f : TY...}> --> llvm<"%name = { ty... }"> | ||
std::optional<mlir::LogicalResult> | ||
LLVMTypeConverter::convertRecordType(fir::RecordType derived, | ||
llvm::SmallVectorImpl<mlir::Type> &results, | ||
llvm::ArrayRef<mlir::Type> callStack) { | ||
auto name = derived.getName(); | ||
auto st = mlir::LLVM::LLVMStructType::getIdentified(&getContext(), name); | ||
if (llvm::count(callStack, derived) > 1) { | ||
results.push_back(st); | ||
return mlir::success(); | ||
} | ||
llvm::SmallVector<mlir::Type> members; | ||
for (auto mem : derived.getTypeList()) { | ||
// Prevent fir.box from degenerating to a pointer to a descriptor in the | ||
// context of a record type. | ||
if (auto box = mem.second.dyn_cast<fir::BaseBoxType>()) | ||
members.push_back(convertBoxTypeAsStruct(box)); | ||
else | ||
members.push_back(convertType(mem.second).cast<mlir::Type>()); | ||
} | ||
if (mlir::failed(st.setBody(members, /*isPacked=*/false))) | ||
return mlir::failure(); | ||
results.push_back(st); | ||
return mlir::success(); | ||
} | ||
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// Is an extended descriptor needed given the element type of a fir.box type ? | ||
// Extended descriptors are required for derived types. | ||
bool LLVMTypeConverter::requiresExtendedDesc(mlir::Type boxElementType) { | ||
auto eleTy = fir::unwrapSequenceType(boxElementType); | ||
return eleTy.isa<fir::RecordType>(); | ||
} | ||
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// This corresponds to the descriptor as defined in ISO_Fortran_binding.h and | ||
// the addendum defined in descriptor.h. | ||
mlir::Type LLVMTypeConverter::convertBoxType(BaseBoxType box, int rank) { | ||
// (base_addr*, elem_len, version, rank, type, attribute, f18Addendum, [dim] | ||
llvm::SmallVector<mlir::Type> dataDescFields; | ||
mlir::Type ele = box.getEleTy(); | ||
// remove fir.heap/fir.ref/fir.ptr | ||
if (auto removeIndirection = fir::dyn_cast_ptrEleTy(ele)) | ||
ele = removeIndirection; | ||
auto eleTy = convertType(ele); | ||
// base_addr* | ||
if (ele.isa<SequenceType>() && eleTy.isa<mlir::LLVM::LLVMPointerType>()) | ||
dataDescFields.push_back(eleTy); | ||
else | ||
dataDescFields.push_back(mlir::LLVM::LLVMPointerType::get(eleTy)); | ||
// elem_len | ||
dataDescFields.push_back( | ||
getDescFieldTypeModel<kElemLenPosInBox>()(&getContext())); | ||
// version | ||
dataDescFields.push_back( | ||
getDescFieldTypeModel<kVersionPosInBox>()(&getContext())); | ||
// rank | ||
dataDescFields.push_back( | ||
getDescFieldTypeModel<kRankPosInBox>()(&getContext())); | ||
// type | ||
dataDescFields.push_back( | ||
getDescFieldTypeModel<kTypePosInBox>()(&getContext())); | ||
// attribute | ||
dataDescFields.push_back( | ||
getDescFieldTypeModel<kAttributePosInBox>()(&getContext())); | ||
// f18Addendum | ||
dataDescFields.push_back( | ||
getDescFieldTypeModel<kF18AddendumPosInBox>()(&getContext())); | ||
// [dims] | ||
if (rank == unknownRank()) { | ||
if (auto seqTy = ele.dyn_cast<SequenceType>()) | ||
rank = seqTy.getDimension(); | ||
else | ||
rank = 0; | ||
} | ||
if (rank > 0) { | ||
auto rowTy = getDescFieldTypeModel<kDimsPosInBox>()(&getContext()); | ||
dataDescFields.push_back(mlir::LLVM::LLVMArrayType::get(rowTy, rank)); | ||
} | ||
// opt-type-ptr: i8* (see fir.tdesc) | ||
if (requiresExtendedDesc(ele) || fir::isUnlimitedPolymorphicType(box)) { | ||
dataDescFields.push_back( | ||
getExtendedDescFieldTypeModel<kOptTypePtrPosInBox>()(&getContext())); | ||
auto rowTy = | ||
getExtendedDescFieldTypeModel<kOptRowTypePosInBox>()(&getContext()); | ||
dataDescFields.push_back(mlir::LLVM::LLVMArrayType::get(rowTy, 1)); | ||
if (auto recTy = fir::unwrapSequenceType(ele).dyn_cast<fir::RecordType>()) | ||
if (recTy.getNumLenParams() > 0) { | ||
// The descriptor design needs to be clarified regarding the number of | ||
// length parameters in the addendum. Since it can change for | ||
// polymorphic allocatables, it seems all length parameters cannot | ||
// always possibly be placed in the addendum. | ||
TODO_NOLOC("extended descriptor derived with length parameters"); | ||
unsigned numLenParams = recTy.getNumLenParams(); | ||
dataDescFields.push_back( | ||
mlir::LLVM::LLVMArrayType::get(rowTy, numLenParams)); | ||
} | ||
} | ||
// TODO: send the box type and the converted LLVM structure layout | ||
// to tbaaBuilder for proper creation of TBAATypeDescriptorOp. | ||
return mlir::LLVM::LLVMPointerType::get( | ||
mlir::LLVM::LLVMStructType::getLiteral(&getContext(), dataDescFields, | ||
/*isPacked=*/false)); | ||
} | ||
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/// Convert fir.box type to the corresponding llvm struct type instead of a | ||
/// pointer to this struct type. | ||
mlir::Type LLVMTypeConverter::convertBoxTypeAsStruct(BaseBoxType box) { | ||
return convertBoxType(box) | ||
.cast<mlir::LLVM::LLVMPointerType>() | ||
.getElementType(); | ||
} | ||
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// fir.boxproc<any> --> llvm<"{ any*, i8* }"> | ||
mlir::Type LLVMTypeConverter::convertBoxProcType(BoxProcType boxproc) { | ||
auto funcTy = convertType(boxproc.getEleTy()); | ||
auto i8PtrTy = mlir::LLVM::LLVMPointerType::get( | ||
mlir::IntegerType::get(&getContext(), 8)); | ||
llvm::SmallVector<mlir::Type, 2> tuple = {funcTy, i8PtrTy}; | ||
return mlir::LLVM::LLVMStructType::getLiteral(&getContext(), tuple, | ||
/*isPacked=*/false); | ||
} | ||
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unsigned LLVMTypeConverter::characterBitsize(fir::CharacterType charTy) { | ||
return kindMapping.getCharacterBitsize(charTy.getFKind()); | ||
} | ||
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// fir.char<k,?> --> llvm<"ix"> where ix is scaled by kind mapping | ||
// fir.char<k,n> --> llvm.array<n x "ix"> | ||
mlir::Type LLVMTypeConverter::convertCharType(fir::CharacterType charTy) { | ||
auto iTy = mlir::IntegerType::get(&getContext(), characterBitsize(charTy)); | ||
if (charTy.getLen() == fir::CharacterType::unknownLen()) | ||
return iTy; | ||
return mlir::LLVM::LLVMArrayType::get(iTy, charTy.getLen()); | ||
} | ||
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// convert a front-end kind value to either a std or LLVM IR dialect type | ||
// fir.real<n> --> llvm.anyfloat where anyfloat is a kind mapping | ||
mlir::Type LLVMTypeConverter::convertRealType(fir::KindTy kind) { | ||
return fir::fromRealTypeID(&getContext(), kindMapping.getRealTypeID(kind), | ||
kind); | ||
} | ||
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// fir.array<c ... :any> --> llvm<"[...[c x any]]"> | ||
mlir::Type LLVMTypeConverter::convertSequenceType(SequenceType seq) { | ||
auto baseTy = convertType(seq.getEleTy()); | ||
if (characterWithDynamicLen(seq.getEleTy())) | ||
return mlir::LLVM::LLVMPointerType::get(baseTy); | ||
auto shape = seq.getShape(); | ||
auto constRows = seq.getConstantRows(); | ||
if (constRows) { | ||
decltype(constRows) i = constRows; | ||
for (auto e : shape) { | ||
baseTy = mlir::LLVM::LLVMArrayType::get(baseTy, e); | ||
if (--i == 0) | ||
break; | ||
} | ||
if (!seq.hasDynamicExtents()) | ||
return baseTy; | ||
} | ||
return mlir::LLVM::LLVMPointerType::get(baseTy); | ||
} | ||
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// fir.tdesc<any> --> llvm<"i8*"> | ||
// TODO: For now use a void*, however pointer identity is not sufficient for | ||
// the f18 object v. class distinction (F2003). | ||
mlir::Type LLVMTypeConverter::convertTypeDescType(mlir::MLIRContext *ctx) { | ||
return mlir::LLVM::LLVMPointerType::get( | ||
mlir::IntegerType::get(&getContext(), 8)); | ||
} | ||
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// Relay TBAA tag attachment to TBAABuilder. | ||
void LLVMTypeConverter::attachTBAATag(mlir::LLVM::AliasAnalysisOpInterface op, | ||
mlir::Type baseFIRType, | ||
mlir::Type accessFIRType, | ||
mlir::LLVM::GEPOp gep) { | ||
tbaaBuilder.attachTBAATag(op, baseFIRType, accessFIRType, gep); | ||
} | ||
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} // namespace fir |
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