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//===-- Runtime.cpp -------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "flang/Lower/Runtime.h"
#include "flang/Lower/Bridge.h"
#include "flang/Lower/Todo.h"
#include "flang/Optimizer/Builder/FIRBuilder.h"
#include "flang/Optimizer/Builder/Runtime/RTBuilder.h"
#include "flang/Parser/parse-tree.h"
#include "flang/Runtime/stop.h"
#include "flang/Semantics/tools.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "flang-lower-runtime"
using namespace Fortran::runtime;
/// Runtime calls that do not return to the caller indicate this condition by
/// terminating the current basic block with an unreachable op.
static void genUnreachable(fir::FirOpBuilder &builder, mlir::Location loc) {
builder.create<fir::UnreachableOp>(loc);
mlir::Block *newBlock =
builder.getBlock()->splitBlock(builder.getInsertionPoint());
builder.setInsertionPointToStart(newBlock);
}
//===----------------------------------------------------------------------===//
// Misc. Fortran statements that lower to runtime calls
//===----------------------------------------------------------------------===//
void Fortran::lower::genStopStatement(
Fortran::lower::AbstractConverter &converter,
const Fortran::parser::StopStmt &stmt) {
fir::FirOpBuilder &builder = converter.getFirOpBuilder();
mlir::Location loc = converter.getCurrentLocation();
llvm::SmallVector<mlir::Value> operands;
mlir::FuncOp callee;
mlir::FunctionType calleeType;
// First operand is stop code (zero if absent)
if (std::get<std::optional<Fortran::parser::StopCode>>(stmt.t)) {
TODO(loc, "STOP first operand not lowered yet");
} else {
callee = fir::runtime::getRuntimeFunc<mkRTKey(StopStatement)>(loc, builder);
calleeType = callee.getType();
operands.push_back(
builder.createIntegerConstant(loc, calleeType.getInput(0), 0));
}
// Second operand indicates ERROR STOP
bool isError = std::get<Fortran::parser::StopStmt::Kind>(stmt.t) ==
Fortran::parser::StopStmt::Kind::ErrorStop;
operands.push_back(builder.createIntegerConstant(
loc, calleeType.getInput(operands.size()), isError));
// Third operand indicates QUIET (default to false).
if (std::get<std::optional<Fortran::parser::ScalarLogicalExpr>>(stmt.t)) {
TODO(loc, "STOP third operand not lowered yet");
} else {
operands.push_back(builder.createIntegerConstant(
loc, calleeType.getInput(operands.size()), 0));
}
builder.create<fir::CallOp>(loc, callee, operands);
genUnreachable(builder, loc);
}
void Fortran::lower::genPauseStatement(
Fortran::lower::AbstractConverter &converter,
const Fortran::parser::PauseStmt &) {
fir::FirOpBuilder &builder = converter.getFirOpBuilder();
mlir::Location loc = converter.getCurrentLocation();
mlir::FuncOp callee =
fir::runtime::getRuntimeFunc<mkRTKey(PauseStatement)>(loc, builder);
builder.create<fir::CallOp>(loc, callee, llvm::None);
}
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