forked from OSchip/llvm-project
699 lines
30 KiB
C++
699 lines
30 KiB
C++
//===-- Allocatable.cpp -- Allocatable statements lowering ----------------===//
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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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// Coding style: https://mlir.llvm.org/getting_started/DeveloperGuide/
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//
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//===----------------------------------------------------------------------===//
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#include "flang/Lower/Allocatable.h"
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#include "flang/Evaluate/tools.h"
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#include "flang/Lower/AbstractConverter.h"
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#include "flang/Lower/PFTBuilder.h"
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#include "flang/Lower/Runtime.h"
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#include "flang/Lower/StatementContext.h"
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#include "flang/Lower/Todo.h"
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#include "flang/Optimizer/Builder/FIRBuilder.h"
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#include "flang/Optimizer/Builder/Runtime/RTBuilder.h"
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#include "flang/Optimizer/Dialect/FIROps.h"
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#include "flang/Optimizer/Dialect/FIROpsSupport.h"
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#include "flang/Optimizer/Support/FatalError.h"
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#include "flang/Parser/parse-tree.h"
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#include "flang/Runtime/allocatable.h"
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#include "flang/Runtime/pointer.h"
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#include "flang/Semantics/tools.h"
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#include "flang/Semantics/type.h"
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#include "llvm/Support/CommandLine.h"
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/// By default fir memory operation fir::AllocMemOp/fir::FreeMemOp are used.
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/// This switch allow forcing the use of runtime and descriptors for everything.
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/// This is mainly intended as a debug switch.
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static llvm::cl::opt<bool> useAllocateRuntime(
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"use-alloc-runtime",
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llvm::cl::desc("Lower allocations to fortran runtime calls"),
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llvm::cl::init(false));
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/// Switch to force lowering of allocatable and pointers to descriptors in all
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/// cases for debug purposes.
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static llvm::cl::opt<bool> useDescForMutableBox(
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"use-desc-for-alloc",
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llvm::cl::desc("Always use descriptors for POINTER and ALLOCATABLE"),
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llvm::cl::init(false));
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//===----------------------------------------------------------------------===//
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// Error management
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//===----------------------------------------------------------------------===//
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namespace {
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// Manage STAT and ERRMSG specifier information across a sequence of runtime
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// calls for an ALLOCATE/DEALLOCATE stmt.
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struct ErrorManager {
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void init(Fortran::lower::AbstractConverter &converter, mlir::Location loc,
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const Fortran::lower::SomeExpr *statExpr,
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const Fortran::lower::SomeExpr *errMsgExpr) {
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Fortran::lower::StatementContext stmtCtx;
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fir::FirOpBuilder &builder = converter.getFirOpBuilder();
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hasStat = builder.createBool(loc, statExpr != nullptr);
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statAddr = statExpr
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? fir::getBase(converter.genExprAddr(statExpr, stmtCtx, loc))
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: mlir::Value{};
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errMsgAddr =
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statExpr && errMsgExpr
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? builder.createBox(loc,
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converter.genExprAddr(errMsgExpr, stmtCtx, loc))
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: builder.create<fir::AbsentOp>(
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loc,
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fir::BoxType::get(mlir::NoneType::get(builder.getContext())));
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sourceFile = fir::factory::locationToFilename(builder, loc);
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sourceLine = fir::factory::locationToLineNo(builder, loc,
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builder.getIntegerType(32));
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}
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bool hasStatSpec() const { return static_cast<bool>(statAddr); }
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void genStatCheck(fir::FirOpBuilder &builder, mlir::Location loc) {
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if (statValue) {
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mlir::Value zero =
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builder.createIntegerConstant(loc, statValue.getType(), 0);
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auto cmp = builder.create<mlir::arith::CmpIOp>(
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loc, mlir::arith::CmpIPredicate::eq, statValue, zero);
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auto ifOp = builder.create<fir::IfOp>(loc, cmp,
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/*withElseRegion=*/false);
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builder.setInsertionPointToStart(&ifOp.getThenRegion().front());
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}
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}
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void assignStat(fir::FirOpBuilder &builder, mlir::Location loc,
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mlir::Value stat) {
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if (hasStatSpec()) {
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assert(stat && "missing stat value");
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mlir::Value castStat = builder.createConvert(
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loc, fir::dyn_cast_ptrEleTy(statAddr.getType()), stat);
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builder.create<fir::StoreOp>(loc, castStat, statAddr);
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statValue = stat;
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}
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}
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mlir::Value hasStat;
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mlir::Value errMsgAddr;
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mlir::Value sourceFile;
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mlir::Value sourceLine;
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private:
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mlir::Value statAddr; // STAT variable address
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mlir::Value statValue; // current runtime STAT value
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};
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//===----------------------------------------------------------------------===//
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// Allocatables runtime call generators
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//===----------------------------------------------------------------------===//
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using namespace Fortran::runtime;
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/// Generate a runtime call to set the bounds of an allocatable or pointer
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/// descriptor.
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static void genRuntimeSetBounds(fir::FirOpBuilder &builder, mlir::Location loc,
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const fir::MutableBoxValue &box,
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mlir::Value dimIndex, mlir::Value lowerBound,
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mlir::Value upperBound) {
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mlir::FuncOp callee =
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box.isPointer()
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? fir::runtime::getRuntimeFunc<mkRTKey(PointerSetBounds)>(loc,
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builder)
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: fir::runtime::getRuntimeFunc<mkRTKey(AllocatableSetBounds)>(
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loc, builder);
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llvm::SmallVector<mlir::Value> args{box.getAddr(), dimIndex, lowerBound,
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upperBound};
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llvm::SmallVector<mlir::Value> operands;
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for (auto [fst, snd] : llvm::zip(args, callee.getFunctionType().getInputs()))
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operands.emplace_back(builder.createConvert(loc, snd, fst));
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builder.create<fir::CallOp>(loc, callee, operands);
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}
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/// Generate runtime call to set the lengths of a character allocatable or
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/// pointer descriptor.
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static void genRuntimeInitCharacter(fir::FirOpBuilder &builder,
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mlir::Location loc,
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const fir::MutableBoxValue &box,
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mlir::Value len) {
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mlir::FuncOp callee =
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box.isPointer()
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? fir::runtime::getRuntimeFunc<mkRTKey(PointerNullifyCharacter)>(
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loc, builder)
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: fir::runtime::getRuntimeFunc<mkRTKey(AllocatableInitCharacter)>(
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loc, builder);
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llvm::ArrayRef<mlir::Type> inputTypes = callee.getFunctionType().getInputs();
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if (inputTypes.size() != 5)
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fir::emitFatalError(
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loc, "AllocatableInitCharacter runtime interface not as expected");
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llvm::SmallVector<mlir::Value> args;
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args.push_back(builder.createConvert(loc, inputTypes[0], box.getAddr()));
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args.push_back(builder.createConvert(loc, inputTypes[1], len));
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int kind = box.getEleTy().cast<fir::CharacterType>().getFKind();
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args.push_back(builder.createIntegerConstant(loc, inputTypes[2], kind));
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int rank = box.rank();
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args.push_back(builder.createIntegerConstant(loc, inputTypes[3], rank));
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// TODO: coarrays
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int corank = 0;
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args.push_back(builder.createIntegerConstant(loc, inputTypes[4], corank));
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builder.create<fir::CallOp>(loc, callee, args);
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}
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/// Generate a sequence of runtime calls to allocate memory.
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static mlir::Value genRuntimeAllocate(fir::FirOpBuilder &builder,
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mlir::Location loc,
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const fir::MutableBoxValue &box,
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ErrorManager &errorManager) {
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mlir::FuncOp callee =
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box.isPointer()
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? fir::runtime::getRuntimeFunc<mkRTKey(PointerAllocate)>(loc, builder)
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: fir::runtime::getRuntimeFunc<mkRTKey(AllocatableAllocate)>(loc,
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builder);
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llvm::SmallVector<mlir::Value> args{
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box.getAddr(), errorManager.hasStat, errorManager.errMsgAddr,
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errorManager.sourceFile, errorManager.sourceLine};
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llvm::SmallVector<mlir::Value> operands;
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for (auto [fst, snd] : llvm::zip(args, callee.getFunctionType().getInputs()))
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operands.emplace_back(builder.createConvert(loc, snd, fst));
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return builder.create<fir::CallOp>(loc, callee, operands).getResult(0);
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}
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/// Generate a runtime call to deallocate memory.
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static mlir::Value genRuntimeDeallocate(fir::FirOpBuilder &builder,
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mlir::Location loc,
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const fir::MutableBoxValue &box,
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ErrorManager &errorManager) {
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// Ensure fir.box is up-to-date before passing it to deallocate runtime.
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mlir::Value boxAddress = fir::factory::getMutableIRBox(builder, loc, box);
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mlir::FuncOp callee =
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box.isPointer()
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? fir::runtime::getRuntimeFunc<mkRTKey(PointerDeallocate)>(loc,
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builder)
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: fir::runtime::getRuntimeFunc<mkRTKey(AllocatableDeallocate)>(
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loc, builder);
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llvm::SmallVector<mlir::Value> args{
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boxAddress, errorManager.hasStat, errorManager.errMsgAddr,
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errorManager.sourceFile, errorManager.sourceLine};
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llvm::SmallVector<mlir::Value> operands;
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for (auto [fst, snd] : llvm::zip(args, callee.getFunctionType().getInputs()))
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operands.emplace_back(builder.createConvert(loc, snd, fst));
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return builder.create<fir::CallOp>(loc, callee, operands).getResult(0);
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}
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//===----------------------------------------------------------------------===//
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// Allocate statement implementation
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//===----------------------------------------------------------------------===//
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/// Helper to get symbol from AllocateObject.
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static const Fortran::semantics::Symbol &
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unwrapSymbol(const Fortran::parser::AllocateObject &allocObj) {
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const Fortran::parser::Name &lastName =
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Fortran::parser::GetLastName(allocObj);
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assert(lastName.symbol);
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return *lastName.symbol;
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}
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static fir::MutableBoxValue
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genMutableBoxValue(Fortran::lower::AbstractConverter &converter,
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mlir::Location loc,
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const Fortran::parser::AllocateObject &allocObj) {
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const Fortran::lower::SomeExpr *expr = Fortran::semantics::GetExpr(allocObj);
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assert(expr && "semantic analysis failure");
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return converter.genExprMutableBox(loc, *expr);
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}
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/// Implement Allocate statement lowering.
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class AllocateStmtHelper {
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public:
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AllocateStmtHelper(Fortran::lower::AbstractConverter &converter,
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const Fortran::parser::AllocateStmt &stmt,
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mlir::Location loc)
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: converter{converter}, builder{converter.getFirOpBuilder()}, stmt{stmt},
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loc{loc} {}
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void lower() {
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visitAllocateOptions();
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lowerAllocateLengthParameters();
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errorManager.init(converter, loc, statExpr, errMsgExpr);
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if (sourceExpr || moldExpr)
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TODO(loc, "lower MOLD/SOURCE expr in allocate");
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mlir::OpBuilder::InsertPoint insertPt = builder.saveInsertionPoint();
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for (const auto &allocation :
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std::get<std::list<Fortran::parser::Allocation>>(stmt.t))
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lowerAllocation(unwrapAllocation(allocation));
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builder.restoreInsertionPoint(insertPt);
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}
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private:
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struct Allocation {
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const Fortran::parser::Allocation &alloc;
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const Fortran::semantics::DeclTypeSpec &type;
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bool hasCoarraySpec() const {
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return std::get<std::optional<Fortran::parser::AllocateCoarraySpec>>(
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alloc.t)
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.has_value();
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}
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const Fortran::parser::AllocateObject &getAllocObj() const {
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return std::get<Fortran::parser::AllocateObject>(alloc.t);
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}
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const Fortran::semantics::Symbol &getSymbol() const {
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return unwrapSymbol(getAllocObj());
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}
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const std::list<Fortran::parser::AllocateShapeSpec> &getShapeSpecs() const {
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return std::get<std::list<Fortran::parser::AllocateShapeSpec>>(alloc.t);
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}
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};
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Allocation unwrapAllocation(const Fortran::parser::Allocation &alloc) {
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const auto &allocObj = std::get<Fortran::parser::AllocateObject>(alloc.t);
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const Fortran::semantics::Symbol &symbol = unwrapSymbol(allocObj);
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assert(symbol.GetType());
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return Allocation{alloc, *symbol.GetType()};
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}
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void visitAllocateOptions() {
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for (const auto &allocOption :
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std::get<std::list<Fortran::parser::AllocOpt>>(stmt.t))
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std::visit(
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Fortran::common::visitors{
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[&](const Fortran::parser::StatOrErrmsg &statOrErr) {
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std::visit(
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Fortran::common::visitors{
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[&](const Fortran::parser::StatVariable &statVar) {
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statExpr = Fortran::semantics::GetExpr(statVar);
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},
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[&](const Fortran::parser::MsgVariable &errMsgVar) {
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errMsgExpr = Fortran::semantics::GetExpr(errMsgVar);
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},
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},
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statOrErr.u);
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},
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[&](const Fortran::parser::AllocOpt::Source &source) {
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sourceExpr = Fortran::semantics::GetExpr(source.v.value());
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},
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[&](const Fortran::parser::AllocOpt::Mold &mold) {
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moldExpr = Fortran::semantics::GetExpr(mold.v.value());
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},
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},
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allocOption.u);
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}
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void lowerAllocation(const Allocation &alloc) {
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fir::MutableBoxValue boxAddr =
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genMutableBoxValue(converter, loc, alloc.getAllocObj());
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if (sourceExpr) {
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genSourceAllocation(alloc, boxAddr);
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} else if (moldExpr) {
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genMoldAllocation(alloc, boxAddr);
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} else {
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genSimpleAllocation(alloc, boxAddr);
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}
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}
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static bool lowerBoundsAreOnes(const Allocation &alloc) {
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for (const Fortran::parser::AllocateShapeSpec &shapeSpec :
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alloc.getShapeSpecs())
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if (std::get<0>(shapeSpec.t))
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return false;
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return true;
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}
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/// Build name for the fir::allocmem generated for alloc.
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std::string mangleAlloc(const Allocation &alloc) {
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return converter.mangleName(alloc.getSymbol()) + ".alloc";
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}
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/// Generate allocation without runtime calls.
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/// Only for intrinsic types. No coarrays, no polymorphism. No error recovery.
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void genInlinedAllocation(const Allocation &alloc,
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const fir::MutableBoxValue &box) {
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llvm::SmallVector<mlir::Value> lbounds;
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llvm::SmallVector<mlir::Value> extents;
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Fortran::lower::StatementContext stmtCtx;
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mlir::Type idxTy = builder.getIndexType();
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bool lBoundsAreOnes = lowerBoundsAreOnes(alloc);
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mlir::Value one = builder.createIntegerConstant(loc, idxTy, 1);
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for (const Fortran::parser::AllocateShapeSpec &shapeSpec :
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alloc.getShapeSpecs()) {
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mlir::Value lb;
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if (!lBoundsAreOnes) {
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if (const std::optional<Fortran::parser::BoundExpr> &lbExpr =
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std::get<0>(shapeSpec.t)) {
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lb = fir::getBase(converter.genExprValue(
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Fortran::semantics::GetExpr(*lbExpr), stmtCtx, loc));
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lb = builder.createConvert(loc, idxTy, lb);
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} else {
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lb = one;
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}
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lbounds.emplace_back(lb);
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}
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mlir::Value ub = fir::getBase(converter.genExprValue(
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Fortran::semantics::GetExpr(std::get<1>(shapeSpec.t)), stmtCtx, loc));
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ub = builder.createConvert(loc, idxTy, ub);
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if (lb) {
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mlir::Value diff = builder.create<mlir::arith::SubIOp>(loc, ub, lb);
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extents.emplace_back(
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builder.create<mlir::arith::AddIOp>(loc, diff, one));
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} else {
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extents.emplace_back(ub);
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}
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}
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fir::factory::genInlinedAllocation(builder, loc, box, lbounds, extents,
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lenParams, mangleAlloc(alloc));
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}
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void genSimpleAllocation(const Allocation &alloc,
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const fir::MutableBoxValue &box) {
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if (!box.isDerived() && !errorManager.hasStatSpec() &&
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!alloc.type.IsPolymorphic() && !alloc.hasCoarraySpec() &&
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!useAllocateRuntime) {
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genInlinedAllocation(alloc, box);
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return;
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}
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// Generate a sequence of runtime calls.
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errorManager.genStatCheck(builder, loc);
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if (box.isPointer()) {
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// For pointers, the descriptor may still be uninitialized (see Fortran
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// 2018 19.5.2.2). The allocation runtime needs to be given a descriptor
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// with initialized rank, types and attributes. Initialize the descriptor
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// here to ensure these constraints are fulfilled.
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mlir::Value nullPointer = fir::factory::createUnallocatedBox(
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builder, loc, box.getBoxTy(), box.nonDeferredLenParams());
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builder.create<fir::StoreOp>(loc, nullPointer, box.getAddr());
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} else {
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assert(box.isAllocatable() && "must be an allocatable");
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// For allocatables, sync the MutableBoxValue and descriptor before the
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// calls in case it is tracked locally by a set of variables.
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fir::factory::getMutableIRBox(builder, loc, box);
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}
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if (alloc.hasCoarraySpec())
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TODO(loc, "coarray allocation");
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if (alloc.type.IsPolymorphic())
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genSetType(alloc, box);
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genSetDeferredLengthParameters(alloc, box);
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// Set bounds for arrays
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mlir::Type idxTy = builder.getIndexType();
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mlir::Type i32Ty = builder.getIntegerType(32);
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Fortran::lower::StatementContext stmtCtx;
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for (const auto &iter : llvm::enumerate(alloc.getShapeSpecs())) {
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mlir::Value lb;
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const auto &bounds = iter.value().t;
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if (const std::optional<Fortran::parser::BoundExpr> &lbExpr =
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std::get<0>(bounds))
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lb = fir::getBase(converter.genExprValue(
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Fortran::semantics::GetExpr(*lbExpr), stmtCtx, loc));
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else
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lb = builder.createIntegerConstant(loc, idxTy, 1);
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mlir::Value ub = fir::getBase(converter.genExprValue(
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Fortran::semantics::GetExpr(std::get<1>(bounds)), stmtCtx, loc));
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mlir::Value dimIndex =
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builder.createIntegerConstant(loc, i32Ty, iter.index());
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// Runtime call
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genRuntimeSetBounds(builder, loc, box, dimIndex, lb, ub);
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}
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mlir::Value stat = genRuntimeAllocate(builder, loc, box, errorManager);
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fir::factory::syncMutableBoxFromIRBox(builder, loc, box);
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errorManager.assignStat(builder, loc, stat);
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}
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/// Lower the length parameters that may be specified in the optional
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/// type specification.
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void lowerAllocateLengthParameters() {
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const Fortran::semantics::DeclTypeSpec *typeSpec =
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getIfAllocateStmtTypeSpec();
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if (!typeSpec)
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return;
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if (const Fortran::semantics::DerivedTypeSpec *derived =
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typeSpec->AsDerived())
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if (Fortran::semantics::CountLenParameters(*derived) > 0)
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TODO(loc, "TODO: setting derived type params in allocation");
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if (typeSpec->category() ==
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Fortran::semantics::DeclTypeSpec::Category::Character) {
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Fortran::semantics::ParamValue lenParam =
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typeSpec->characterTypeSpec().length();
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if (Fortran::semantics::MaybeIntExpr intExpr = lenParam.GetExplicit()) {
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Fortran::lower::StatementContext stmtCtx;
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Fortran::lower::SomeExpr lenExpr{*intExpr};
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lenParams.push_back(
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fir::getBase(converter.genExprValue(lenExpr, stmtCtx, &loc)));
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}
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}
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}
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// Set length parameters in the box stored in boxAddr.
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// This must be called before setting the bounds because it may use
|
|
// Init runtime calls that may set the bounds to zero.
|
|
void genSetDeferredLengthParameters(const Allocation &alloc,
|
|
const fir::MutableBoxValue &box) {
|
|
if (lenParams.empty())
|
|
return;
|
|
// TODO: in case a length parameter was not deferred, insert a runtime check
|
|
// that the length is the same (AllocatableCheckLengthParameter runtime
|
|
// call).
|
|
if (box.isCharacter())
|
|
genRuntimeInitCharacter(builder, loc, box, lenParams[0]);
|
|
|
|
if (box.isDerived())
|
|
TODO(loc, "derived type length parameters in allocate");
|
|
}
|
|
|
|
void genSourceAllocation(const Allocation &, const fir::MutableBoxValue &) {
|
|
TODO(loc, "SOURCE allocation lowering");
|
|
}
|
|
void genMoldAllocation(const Allocation &, const fir::MutableBoxValue &) {
|
|
TODO(loc, "MOLD allocation lowering");
|
|
}
|
|
void genSetType(const Allocation &, const fir::MutableBoxValue &) {
|
|
TODO(loc, "Polymorphic entity allocation lowering");
|
|
}
|
|
|
|
/// Returns a pointer to the DeclTypeSpec if a type-spec is provided in the
|
|
/// allocate statement. Returns a null pointer otherwise.
|
|
const Fortran::semantics::DeclTypeSpec *getIfAllocateStmtTypeSpec() const {
|
|
if (const auto &typeSpec =
|
|
std::get<std::optional<Fortran::parser::TypeSpec>>(stmt.t))
|
|
return typeSpec->declTypeSpec;
|
|
return nullptr;
|
|
}
|
|
|
|
Fortran::lower::AbstractConverter &converter;
|
|
fir::FirOpBuilder &builder;
|
|
const Fortran::parser::AllocateStmt &stmt;
|
|
const Fortran::lower::SomeExpr *sourceExpr{nullptr};
|
|
const Fortran::lower::SomeExpr *moldExpr{nullptr};
|
|
const Fortran::lower::SomeExpr *statExpr{nullptr};
|
|
const Fortran::lower::SomeExpr *errMsgExpr{nullptr};
|
|
// If the allocate has a type spec, lenParams contains the
|
|
// value of the length parameters that were specified inside.
|
|
llvm::SmallVector<mlir::Value> lenParams;
|
|
ErrorManager errorManager;
|
|
|
|
mlir::Location loc;
|
|
};
|
|
} // namespace
|
|
|
|
void Fortran::lower::genAllocateStmt(
|
|
Fortran::lower::AbstractConverter &converter,
|
|
const Fortran::parser::AllocateStmt &stmt, mlir::Location loc) {
|
|
AllocateStmtHelper{converter, stmt, loc}.lower();
|
|
return;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Deallocate statement implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// Generate deallocation of a pointer/allocatable.
|
|
static void genDeallocate(fir::FirOpBuilder &builder, mlir::Location loc,
|
|
const fir::MutableBoxValue &box,
|
|
ErrorManager &errorManager) {
|
|
// Deallocate intrinsic types inline.
|
|
if (!box.isDerived() && !errorManager.hasStatSpec() && !useAllocateRuntime) {
|
|
fir::factory::genInlinedDeallocate(builder, loc, box);
|
|
return;
|
|
}
|
|
// Use runtime calls to deallocate descriptor cases. Sync MutableBoxValue
|
|
// with its descriptor before and after calls if needed.
|
|
errorManager.genStatCheck(builder, loc);
|
|
mlir::Value stat = genRuntimeDeallocate(builder, loc, box, errorManager);
|
|
fir::factory::syncMutableBoxFromIRBox(builder, loc, box);
|
|
errorManager.assignStat(builder, loc, stat);
|
|
}
|
|
|
|
void Fortran::lower::genDeallocateStmt(
|
|
Fortran::lower::AbstractConverter &converter,
|
|
const Fortran::parser::DeallocateStmt &stmt, mlir::Location loc) {
|
|
const Fortran::lower::SomeExpr *statExpr{nullptr};
|
|
const Fortran::lower::SomeExpr *errMsgExpr{nullptr};
|
|
for (const Fortran::parser::StatOrErrmsg &statOrErr :
|
|
std::get<std::list<Fortran::parser::StatOrErrmsg>>(stmt.t))
|
|
std::visit(Fortran::common::visitors{
|
|
[&](const Fortran::parser::StatVariable &statVar) {
|
|
statExpr = Fortran::semantics::GetExpr(statVar);
|
|
},
|
|
[&](const Fortran::parser::MsgVariable &errMsgVar) {
|
|
errMsgExpr = Fortran::semantics::GetExpr(errMsgVar);
|
|
},
|
|
},
|
|
statOrErr.u);
|
|
ErrorManager errorManager;
|
|
errorManager.init(converter, loc, statExpr, errMsgExpr);
|
|
fir::FirOpBuilder &builder = converter.getFirOpBuilder();
|
|
mlir::OpBuilder::InsertPoint insertPt = builder.saveInsertionPoint();
|
|
for (const Fortran::parser::AllocateObject &allocateObject :
|
|
std::get<std::list<Fortran::parser::AllocateObject>>(stmt.t)) {
|
|
fir::MutableBoxValue box =
|
|
genMutableBoxValue(converter, loc, allocateObject);
|
|
genDeallocate(builder, loc, box, errorManager);
|
|
}
|
|
builder.restoreInsertionPoint(insertPt);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// MutableBoxValue creation implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// Is this symbol a pointer to a pointer array that does not have the
|
|
/// CONTIGUOUS attribute ?
|
|
static inline bool
|
|
isNonContiguousArrayPointer(const Fortran::semantics::Symbol &sym) {
|
|
return Fortran::semantics::IsPointer(sym) && sym.Rank() != 0 &&
|
|
!sym.attrs().test(Fortran::semantics::Attr::CONTIGUOUS);
|
|
}
|
|
|
|
/// Is this a local procedure symbol in a procedure that contains internal
|
|
/// procedures ?
|
|
static bool mayBeCapturedInInternalProc(const Fortran::semantics::Symbol &sym) {
|
|
const Fortran::semantics::Scope &owner = sym.owner();
|
|
Fortran::semantics::Scope::Kind kind = owner.kind();
|
|
// Test if this is a procedure scope that contains a subprogram scope that is
|
|
// not an interface.
|
|
if (kind == Fortran::semantics::Scope::Kind::Subprogram ||
|
|
kind == Fortran::semantics::Scope::Kind::MainProgram)
|
|
for (const Fortran::semantics::Scope &childScope : owner.children())
|
|
if (childScope.kind() == Fortran::semantics::Scope::Kind::Subprogram)
|
|
if (const Fortran::semantics::Symbol *childSym = childScope.symbol())
|
|
if (const auto *details =
|
|
childSym->detailsIf<Fortran::semantics::SubprogramDetails>())
|
|
if (!details->isInterface())
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/// In case it is safe to track the properties in variables outside a
|
|
/// descriptor, create the variables to hold the mutable properties of the
|
|
/// entity var. The variables are not initialized here.
|
|
static fir::MutableProperties
|
|
createMutableProperties(Fortran::lower::AbstractConverter &converter,
|
|
mlir::Location loc,
|
|
const Fortran::lower::pft::Variable &var,
|
|
mlir::ValueRange nonDeferredParams) {
|
|
fir::FirOpBuilder &builder = converter.getFirOpBuilder();
|
|
const Fortran::semantics::Symbol &sym = var.getSymbol();
|
|
// Globals and dummies may be associated, creating local variables would
|
|
// require keeping the values and descriptor before and after every single
|
|
// impure calls in the current scope (not only the ones taking the variable as
|
|
// arguments. All.) Volatile means the variable may change in ways not defined
|
|
// per Fortran, so lowering can most likely not keep the descriptor and values
|
|
// in sync as needed.
|
|
// Pointers to non contiguous arrays need to be represented with a fir.box to
|
|
// account for the discontiguity.
|
|
// Pointer/Allocatable in internal procedure are descriptors in the host link,
|
|
// and it would increase complexity to sync this descriptor with the local
|
|
// values every time the host link is escaping.
|
|
if (var.isGlobal() || Fortran::semantics::IsDummy(sym) ||
|
|
Fortran::semantics::IsFunctionResult(sym) ||
|
|
sym.attrs().test(Fortran::semantics::Attr::VOLATILE) ||
|
|
isNonContiguousArrayPointer(sym) || useAllocateRuntime ||
|
|
useDescForMutableBox || mayBeCapturedInInternalProc(sym))
|
|
return {};
|
|
fir::MutableProperties mutableProperties;
|
|
std::string name = converter.mangleName(sym);
|
|
mlir::Type baseAddrTy = converter.genType(sym);
|
|
if (auto boxType = baseAddrTy.dyn_cast<fir::BoxType>())
|
|
baseAddrTy = boxType.getEleTy();
|
|
// Allocate and set a variable to hold the address.
|
|
// It will be set to null in setUnallocatedStatus.
|
|
mutableProperties.addr =
|
|
builder.allocateLocal(loc, baseAddrTy, name + ".addr", "",
|
|
/*shape=*/llvm::None, /*typeparams=*/llvm::None);
|
|
// Allocate variables to hold lower bounds and extents.
|
|
int rank = sym.Rank();
|
|
mlir::Type idxTy = builder.getIndexType();
|
|
for (decltype(rank) i = 0; i < rank; ++i) {
|
|
mlir::Value lboundVar =
|
|
builder.allocateLocal(loc, idxTy, name + ".lb" + std::to_string(i), "",
|
|
/*shape=*/llvm::None, /*typeparams=*/llvm::None);
|
|
mlir::Value extentVar =
|
|
builder.allocateLocal(loc, idxTy, name + ".ext" + std::to_string(i), "",
|
|
/*shape=*/llvm::None, /*typeparams=*/llvm::None);
|
|
mutableProperties.lbounds.emplace_back(lboundVar);
|
|
mutableProperties.extents.emplace_back(extentVar);
|
|
}
|
|
|
|
// Allocate variable to hold deferred length parameters.
|
|
mlir::Type eleTy = baseAddrTy;
|
|
if (auto newTy = fir::dyn_cast_ptrEleTy(eleTy))
|
|
eleTy = newTy;
|
|
if (auto seqTy = eleTy.dyn_cast<fir::SequenceType>())
|
|
eleTy = seqTy.getEleTy();
|
|
if (auto record = eleTy.dyn_cast<fir::RecordType>())
|
|
if (record.getNumLenParams() != 0)
|
|
TODO(loc, "deferred length type parameters.");
|
|
if (fir::isa_char(eleTy) && nonDeferredParams.empty()) {
|
|
mlir::Value lenVar =
|
|
builder.allocateLocal(loc, builder.getCharacterLengthType(),
|
|
name + ".len", "", /*shape=*/llvm::None,
|
|
/*typeparams=*/llvm::None);
|
|
mutableProperties.deferredParams.emplace_back(lenVar);
|
|
}
|
|
return mutableProperties;
|
|
}
|
|
|
|
fir::MutableBoxValue Fortran::lower::createMutableBox(
|
|
Fortran::lower::AbstractConverter &converter, mlir::Location loc,
|
|
const Fortran::lower::pft::Variable &var, mlir::Value boxAddr,
|
|
mlir::ValueRange nonDeferredParams) {
|
|
|
|
fir::MutableProperties mutableProperties =
|
|
createMutableProperties(converter, loc, var, nonDeferredParams);
|
|
fir::MutableBoxValue box(boxAddr, nonDeferredParams, mutableProperties);
|
|
fir::FirOpBuilder &builder = converter.getFirOpBuilder();
|
|
if (!var.isGlobal() && !Fortran::semantics::IsDummy(var.getSymbol()))
|
|
fir::factory::disassociateMutableBox(builder, loc, box);
|
|
return box;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// MutableBoxValue reading interface implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
static bool
|
|
isArraySectionWithoutVectorSubscript(const Fortran::lower::SomeExpr &expr) {
|
|
return expr.Rank() > 0 && Fortran::evaluate::IsVariable(expr) &&
|
|
!Fortran::evaluate::UnwrapWholeSymbolDataRef(expr) &&
|
|
!Fortran::evaluate::HasVectorSubscript(expr);
|
|
}
|
|
|
|
void Fortran::lower::associateMutableBox(
|
|
Fortran::lower::AbstractConverter &converter, mlir::Location loc,
|
|
const fir::MutableBoxValue &box, const Fortran::lower::SomeExpr &source,
|
|
mlir::ValueRange lbounds, Fortran::lower::StatementContext &stmtCtx) {
|
|
fir::FirOpBuilder &builder = converter.getFirOpBuilder();
|
|
if (Fortran::evaluate::UnwrapExpr<Fortran::evaluate::NullPointer>(source)) {
|
|
fir::factory::disassociateMutableBox(builder, loc, box);
|
|
return;
|
|
}
|
|
// The right hand side must not be evaluated in a temp.
|
|
// Array sections can be described by fir.box without making a temp.
|
|
// Otherwise, do not generate a fir.box to avoid having to later use a
|
|
// fir.rebox to implement the pointer association.
|
|
fir::ExtendedValue rhs = isArraySectionWithoutVectorSubscript(source)
|
|
? converter.genExprBox(source, stmtCtx, loc)
|
|
: converter.genExprAddr(source, stmtCtx);
|
|
fir::factory::associateMutableBox(builder, loc, box, rhs, lbounds);
|
|
}
|