343 lines
15 KiB
C++
343 lines
15 KiB
C++
//===-- HLFIRTools.cpp ----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Tools to manipulate HLFIR variable and expressions
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//
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//===----------------------------------------------------------------------===//
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#include "flang/Optimizer/Builder/HLFIRTools.h"
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#include "flang/Optimizer/Builder/FIRBuilder.h"
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#include "flang/Optimizer/Builder/MutableBox.h"
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#include "flang/Optimizer/Builder/Todo.h"
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#include "flang/Optimizer/HLFIR/HLFIROps.h"
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// Return explicit extents. If the base is a fir.box, this won't read it to
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// return the extents and will instead return an empty vector.
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static llvm::SmallVector<mlir::Value>
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getExplicitExtents(fir::FortranVariableOpInterface var) {
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llvm::SmallVector<mlir::Value> result;
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if (mlir::Value shape = var.getShape()) {
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auto *shapeOp = shape.getDefiningOp();
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if (auto s = mlir::dyn_cast_or_null<fir::ShapeOp>(shapeOp)) {
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auto e = s.getExtents();
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result.append(e.begin(), e.end());
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} else if (auto s = mlir::dyn_cast_or_null<fir::ShapeShiftOp>(shapeOp)) {
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auto e = s.getExtents();
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result.append(e.begin(), e.end());
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} else if (mlir::dyn_cast_or_null<fir::ShiftOp>(shapeOp)) {
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return {};
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} else {
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TODO(var->getLoc(), "read fir.shape to get extents");
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}
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}
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return result;
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}
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// Return explicit lower bounds. For pointers and allocatables, this will not
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// read the lower bounds and instead return an empty vector.
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static llvm::SmallVector<mlir::Value>
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getExplicitLbounds(fir::FortranVariableOpInterface var) {
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llvm::SmallVector<mlir::Value> result;
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if (mlir::Value shape = var.getShape()) {
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auto *shapeOp = shape.getDefiningOp();
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if (auto s = mlir::dyn_cast_or_null<fir::ShapeOp>(shapeOp)) {
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return {};
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} else if (auto s = mlir::dyn_cast_or_null<fir::ShapeShiftOp>(shapeOp)) {
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auto e = s.getOrigins();
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result.append(e.begin(), e.end());
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} else if (auto s = mlir::dyn_cast_or_null<fir::ShiftOp>(shapeOp)) {
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auto e = s.getOrigins();
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result.append(e.begin(), e.end());
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} else {
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TODO(var->getLoc(), "read fir.shape to get lower bounds");
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}
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}
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return result;
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}
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static llvm::SmallVector<mlir::Value>
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getExplicitTypeParams(fir::FortranVariableOpInterface var) {
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llvm::SmallVector<mlir::Value> res;
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mlir::OperandRange range = var.getExplicitTypeParams();
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res.append(range.begin(), range.end());
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return res;
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}
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std::pair<fir::ExtendedValue, llvm::Optional<hlfir::CleanupFunction>>
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hlfir::translateToExtendedValue(mlir::Location loc, fir::FirOpBuilder &builder,
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hlfir::Entity entity) {
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if (auto variable = entity.getIfVariableInterface())
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return {hlfir::translateToExtendedValue(loc, builder, variable), {}};
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if (entity.isVariable()) {
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if (entity.isScalar() && !entity.hasLengthParameters() &&
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!hlfir::isBoxAddressOrValueType(entity.getType()))
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return {fir::ExtendedValue{entity.getBase()}, llvm::None};
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TODO(loc, "HLFIR variable to fir::ExtendedValue without a "
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"FortranVariableOpInterface");
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}
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if (entity.getType().isa<hlfir::ExprType>()) {
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hlfir::AssociateOp associate = hlfir::genAssociateExpr(
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loc, builder, entity, entity.getType(), "adapt.valuebyref");
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auto *bldr = &builder;
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hlfir::CleanupFunction cleanup = [bldr, loc, associate]() -> void {
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bldr->create<hlfir::EndAssociateOp>(loc, associate);
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};
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hlfir::Entity temp{associate.getBase()};
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return {translateToExtendedValue(loc, builder, temp).first, cleanup};
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}
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return {{static_cast<mlir::Value>(entity)}, {}};
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}
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mlir::Value hlfir::Entity::getFirBase() const {
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if (fir::FortranVariableOpInterface variable = getIfVariableInterface()) {
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if (auto declareOp =
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mlir::dyn_cast<hlfir::DeclareOp>(variable.getOperation()))
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return declareOp.getOriginalBase();
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if (auto associateOp =
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mlir::dyn_cast<hlfir::AssociateOp>(variable.getOperation()))
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return associateOp.getFirBase();
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}
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return getBase();
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}
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fir::ExtendedValue
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hlfir::translateToExtendedValue(mlir::Location loc, fir::FirOpBuilder &builder,
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fir::FortranVariableOpInterface variable) {
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/// When going towards FIR, use the original base value to avoid
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/// introducing descriptors at runtime when they are not required.
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mlir::Value firBase = Entity{variable}.getFirBase();
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if (variable.isPointer() || variable.isAllocatable())
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TODO(variable->getLoc(), "pointer or allocatable "
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"FortranVariableOpInterface to extendedValue");
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if (firBase.getType().isa<fir::BaseBoxType>())
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return fir::BoxValue(firBase, getExplicitLbounds(variable),
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getExplicitTypeParams(variable));
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if (variable.isCharacter()) {
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if (variable.isArray())
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return fir::CharArrayBoxValue(firBase, variable.getExplicitCharLen(),
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getExplicitExtents(variable),
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getExplicitLbounds(variable));
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if (auto boxCharType = firBase.getType().dyn_cast<fir::BoxCharType>()) {
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auto unboxed = builder.create<fir::UnboxCharOp>(
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loc, fir::ReferenceType::get(boxCharType.getEleTy()),
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builder.getIndexType(), firBase);
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return fir::CharBoxValue(unboxed.getResult(0),
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variable.getExplicitCharLen());
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}
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return fir::CharBoxValue(firBase, variable.getExplicitCharLen());
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}
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if (variable.isArray())
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return fir::ArrayBoxValue(firBase, getExplicitExtents(variable),
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getExplicitLbounds(variable));
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return firBase;
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}
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hlfir::EntityWithAttributes
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hlfir::genDeclare(mlir::Location loc, fir::FirOpBuilder &builder,
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const fir::ExtendedValue &exv, llvm::StringRef name,
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fir::FortranVariableFlagsAttr flags) {
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mlir::Value base = fir::getBase(exv);
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assert(fir::isa_passbyref_type(base.getType()) &&
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"entity being declared must be in memory");
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mlir::Value shapeOrShift;
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llvm::SmallVector<mlir::Value> lenParams;
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exv.match(
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[&](const fir::CharBoxValue &box) {
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lenParams.emplace_back(box.getLen());
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},
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[&](const fir::ArrayBoxValue &) {
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shapeOrShift = builder.createShape(loc, exv);
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},
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[&](const fir::CharArrayBoxValue &box) {
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shapeOrShift = builder.createShape(loc, exv);
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lenParams.emplace_back(box.getLen());
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},
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[&](const fir::BoxValue &box) {
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if (!box.getLBounds().empty())
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shapeOrShift = builder.createShape(loc, exv);
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lenParams.append(box.getExplicitParameters().begin(),
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box.getExplicitParameters().end());
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},
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[&](const fir::MutableBoxValue &box) {
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lenParams.append(box.nonDeferredLenParams().begin(),
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box.nonDeferredLenParams().end());
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},
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[](const auto &) {});
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auto declareOp = builder.create<hlfir::DeclareOp>(
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loc, base, name, shapeOrShift, lenParams, flags);
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return mlir::cast<fir::FortranVariableOpInterface>(declareOp.getOperation());
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}
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hlfir::AssociateOp hlfir::genAssociateExpr(mlir::Location loc,
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fir::FirOpBuilder &builder,
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hlfir::Entity value,
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mlir::Type variableType,
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llvm::StringRef name) {
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assert(value.isValue() && "must not be a variable");
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mlir::Value shape{};
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if (value.isArray())
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TODO(loc, "associating array expressions");
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mlir::Value source = value;
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// Lowered scalar expression values for numerical and logical may have a
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// different type than what is required for the type in memory (logical
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// expressions are typically manipulated as i1, but needs to be stored
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// according to the fir.logical<kind> so that the storage size is correct).
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// Character length mismatches are ignored (it is ok for one to be dynamic
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// and the other static).
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mlir::Type varEleTy = getFortranElementType(variableType);
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mlir::Type valueEleTy = getFortranElementType(value.getType());
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if (varEleTy != valueEleTy && !(valueEleTy.isa<fir::CharacterType>() &&
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varEleTy.isa<fir::CharacterType>())) {
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assert(value.isScalar() && fir::isa_trivial(value.getType()));
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source = builder.createConvert(loc, fir::unwrapPassByRefType(variableType),
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value);
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}
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llvm::SmallVector<mlir::Value> lenParams;
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genLengthParameters(loc, builder, value, lenParams);
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return builder.create<hlfir::AssociateOp>(loc, source, name, shape, lenParams,
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fir::FortranVariableFlagsAttr{});
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}
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mlir::Value hlfir::genVariableRawAddress(mlir::Location loc,
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fir::FirOpBuilder &builder,
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hlfir::Entity var) {
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assert(var.isVariable() && "only address of variables can be taken");
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mlir::Value baseAddr = var.getFirBase();
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if (var.isMutableBox())
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baseAddr = builder.create<fir::LoadOp>(loc, baseAddr);
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// Get raw address.
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if (baseAddr.getType().isa<fir::BaseBoxType>()) {
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auto addrType =
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fir::ReferenceType::get(fir::unwrapPassByRefType(baseAddr.getType()));
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baseAddr = builder.create<fir::BoxAddrOp>(loc, addrType, baseAddr);
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}
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return baseAddr;
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}
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mlir::Value hlfir::genVariableBoxChar(mlir::Location loc,
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fir::FirOpBuilder &builder,
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hlfir::Entity var) {
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assert(var.isVariable() && "only address of variables can be taken");
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if (var.getType().isa<fir::BoxCharType>())
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return var;
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mlir::Value addr = genVariableRawAddress(loc, builder, var);
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llvm::SmallVector<mlir::Value> lengths;
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genLengthParameters(loc, builder, var, lengths);
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assert(lengths.size() == 1);
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auto charType = var.getFortranElementType().cast<fir::CharacterType>();
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auto boxCharType =
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fir::BoxCharType::get(builder.getContext(), charType.getFKind());
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auto scalarAddr =
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builder.createConvert(loc, fir::ReferenceType::get(charType), addr);
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return builder.create<fir::EmboxCharOp>(loc, boxCharType, scalarAddr,
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lengths[0]);
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}
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hlfir::Entity hlfir::loadTrivialScalar(mlir::Location loc,
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fir::FirOpBuilder &builder,
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Entity entity) {
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if (entity.isVariable() && entity.isScalar() &&
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fir::isa_trivial(entity.getFortranElementType())) {
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entity = derefPointersAndAllocatables(loc, builder, entity);
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return Entity{builder.create<fir::LoadOp>(loc, entity)};
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}
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return entity;
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}
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static mlir::Value genUBound(mlir::Location loc, fir::FirOpBuilder &builder,
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mlir::Value lb, mlir::Value extent,
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mlir::Value one) {
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if (auto constantLb = fir::factory::getIntIfConstant(lb))
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if (*constantLb == 1)
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return extent;
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extent = builder.createConvert(loc, one.getType(), extent);
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lb = builder.createConvert(loc, one.getType(), lb);
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auto add = builder.create<mlir::arith::AddIOp>(loc, lb, extent);
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return builder.create<mlir::arith::SubIOp>(loc, add, one);
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}
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llvm::SmallVector<std::pair<mlir::Value, mlir::Value>>
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hlfir::genBounds(mlir::Location loc, fir::FirOpBuilder &builder,
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Entity entity) {
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if (entity.getType().isa<hlfir::ExprType>())
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TODO(loc, "bounds of expressions in hlfir");
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auto [exv, cleanup] = translateToExtendedValue(loc, builder, entity);
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assert(!cleanup && "translation of entity should not yield cleanup");
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if (const auto *mutableBox = exv.getBoxOf<fir::MutableBoxValue>())
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exv = fir::factory::genMutableBoxRead(builder, loc, *mutableBox);
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mlir::Type idxTy = builder.getIndexType();
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mlir::Value one = builder.createIntegerConstant(loc, idxTy, 1);
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llvm::SmallVector<std::pair<mlir::Value, mlir::Value>> result;
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for (unsigned dim = 0; dim < exv.rank(); ++dim) {
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mlir::Value extent = fir::factory::readExtent(builder, loc, exv, dim);
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mlir::Value lb = fir::factory::readLowerBound(builder, loc, exv, dim, one);
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mlir::Value ub = genUBound(loc, builder, lb, extent, one);
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result.push_back({lb, ub});
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}
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return result;
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}
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void hlfir::genLengthParameters(mlir::Location loc, fir::FirOpBuilder &builder,
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Entity entity,
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llvm::SmallVectorImpl<mlir::Value> &result) {
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if (!entity.hasLengthParameters())
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return;
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if (entity.getType().isa<hlfir::ExprType>()) {
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mlir::Value expr = entity;
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if (auto reassoc = expr.getDefiningOp<hlfir::NoReassocOp>())
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expr = reassoc.getVal();
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// Going through fir::ExtendedValue would create a temp,
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// which is not desired for an inquiry.
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// TODO: make this an interface when adding further character producing ops.
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if (auto concat = expr.getDefiningOp<hlfir::ConcatOp>()) {
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result.push_back(concat.getLength());
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return;
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} else if (auto asExpr = expr.getDefiningOp<hlfir::AsExprOp>()) {
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hlfir::genLengthParameters(loc, builder, hlfir::Entity{asExpr.getVar()},
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result);
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return;
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}
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TODO(loc, "inquire type parameters of hlfir.expr");
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}
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if (entity.isCharacter()) {
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auto [exv, cleanup] = translateToExtendedValue(loc, builder, entity);
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assert(!cleanup && "translation of entity should not yield cleanup");
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result.push_back(fir::factory::readCharLen(builder, loc, exv));
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return;
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}
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TODO(loc, "inquire PDTs length parameters in HLFIR");
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}
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std::pair<mlir::Value, mlir::Value> hlfir::genVariableFirBaseShapeAndParams(
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mlir::Location loc, fir::FirOpBuilder &builder, Entity entity,
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llvm::SmallVectorImpl<mlir::Value> &typeParams) {
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auto [exv, cleanup] = translateToExtendedValue(loc, builder, entity);
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assert(!cleanup && "variable to Exv should not produce cleanup");
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if (entity.hasLengthParameters()) {
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auto params = fir::getTypeParams(exv);
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typeParams.append(params.begin(), params.end());
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}
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if (entity.isScalar())
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return {fir::getBase(exv), mlir::Value{}};
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if (auto variableInterface = entity.getIfVariableInterface())
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return {fir::getBase(exv), variableInterface.getShape()};
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return {fir::getBase(exv), builder.createShape(loc, exv)};
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}
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hlfir::Entity hlfir::derefPointersAndAllocatables(mlir::Location loc,
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fir::FirOpBuilder &builder,
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Entity entity) {
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if (entity.isMutableBox())
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return hlfir::Entity{builder.create<fir::LoadOp>(loc, entity).getResult()};
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return entity;
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}
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