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//===-- CodeGenOpenMP.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
//
//===----------------------------------------------------------------------===//
//
// Coding style: https://mlir.llvm.org/getting_started/DeveloperGuide/
//
//===----------------------------------------------------------------------===//
#include "flang/Optimizer/CodeGen/CodeGenOpenMP.h"
#include "flang/Optimizer/Builder/FIRBuilder.h"
#include "flang/Optimizer/Builder/LowLevelIntrinsics.h"
#include "flang/Optimizer/CodeGen/CodeGen.h"
#include "flang/Optimizer/Dialect/FIRDialect.h"
#include "flang/Optimizer/Dialect/FIROps.h"
#include "flang/Optimizer/Dialect/FIRType.h"
#include "flang/Optimizer/Dialect/Support/FIRContext.h"
#include "flang/Optimizer/Support/FatalError.h"
#include "flang/Optimizer/Support/InternalNames.h"
#include "mlir/Conversion/LLVMCommon/ConversionTarget.h"
#include "mlir/Conversion/LLVMCommon/Pattern.h"
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Transforms/DialectConversion.h"
using namespace fir;
#define DEBUG_TYPE "flang-codegen-openmp"
// fir::LLVMTypeConverter for converting to LLVM IR dialect types.
#include "flang/Optimizer/CodeGen/TypeConverter.h"
namespace {
/// A pattern that converts the region arguments in a single-region OpenMP
/// operation to the LLVM dialect. The body of the region is not modified and is
/// expected to either be processed by the conversion infrastructure or already
/// contain ops compatible with LLVM dialect types.
template <typename OpType>
class OpenMPFIROpConversion : public mlir::ConvertOpToLLVMPattern<OpType> {
public:
explicit OpenMPFIROpConversion(const fir::LLVMTypeConverter &lowering)
: mlir::ConvertOpToLLVMPattern<OpType>(lowering) {}
const fir::LLVMTypeConverter &lowerTy() const {
return *static_cast<const fir::LLVMTypeConverter *>(
this->getTypeConverter());
}
};
// FIR Op specific conversion for MapInfoOp that overwrites the default OpenMP
// Dialect lowering, this allows FIR specific lowering of types, required for
// descriptors of allocatables currently.
struct MapInfoOpConversion
: public OpenMPFIROpConversion<mlir::omp::MapInfoOp> {
using OpenMPFIROpConversion::OpenMPFIROpConversion;
llvm::LogicalResult
matchAndRewrite(mlir::omp::MapInfoOp curOp, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
const mlir::TypeConverter *converter = getTypeConverter();
llvm::SmallVector<mlir::Type> resTypes;
if (failed(converter->convertTypes(curOp->getResultTypes(), resTypes)))
return mlir::failure();
llvm::SmallVector<mlir::NamedAttribute> newAttrs;
mlir::omp::MapInfoOp newOp;
for (mlir::NamedAttribute attr : curOp->getAttrs()) {
if (auto typeAttr = mlir::dyn_cast<mlir::TypeAttr>(attr.getValue())) {
mlir::Type newAttr;
if (fir::isTypeWithDescriptor(typeAttr.getValue())) {
newAttr = lowerTy().convertBoxTypeAsStruct(
mlir::cast<fir::BaseBoxType>(typeAttr.getValue()));
} else {
newAttr = converter->convertType(typeAttr.getValue());
}
newAttrs.emplace_back(attr.getName(), mlir::TypeAttr::get(newAttr));
} else {
newAttrs.push_back(attr);
}
}
rewriter.replaceOpWithNewOp<mlir::omp::MapInfoOp>(
curOp, resTypes, adaptor.getOperands(), newAttrs);
return mlir::success();
}
};
// FIR op specific conversion for PrivateClauseOp that overwrites the default
// OpenMP Dialect lowering, this allows FIR-aware lowering of types, required
// for boxes because the OpenMP dialect conversion doesn't know anything about
// FIR types.
struct PrivateClauseOpConversion
: public OpenMPFIROpConversion<mlir::omp::PrivateClauseOp> {
using OpenMPFIROpConversion::OpenMPFIROpConversion;
llvm::LogicalResult
matchAndRewrite(mlir::omp::PrivateClauseOp curOp, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
const fir::LLVMTypeConverter &converter = lowerTy();
mlir::Type convertedAllocType;
if (auto box = mlir::dyn_cast<fir::BaseBoxType>(curOp.getType())) {
// In LLVM codegen fir.box<> == fir.ref<fir.box<>> == llvm.ptr
// Here we really do want the actual structure
if (box.isAssumedRank())
TODO(curOp->getLoc(), "Privatize an assumed rank array");
unsigned rank = 0;
if (auto seqTy = mlir::dyn_cast<fir::SequenceType>(
fir::unwrapRefType(box.getEleTy())))
rank = seqTy.getShape().size();
convertedAllocType = converter.convertBoxTypeAsStruct(box, rank);
} else {
convertedAllocType = converter.convertType(adaptor.getType());
}
if (!convertedAllocType)
return mlir::failure();
rewriter.startOpModification(curOp);
curOp.setType(convertedAllocType);
rewriter.finalizeOpModification(curOp);
return mlir::success();
}
};
} // namespace
void fir::populateOpenMPFIRToLLVMConversionPatterns(
const LLVMTypeConverter &converter, mlir::RewritePatternSet &patterns) {
patterns.add<MapInfoOpConversion>(converter);
patterns.add<PrivateClauseOpConversion>(converter);
}
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