//===- ExternalNameConversion.cpp -- convert name with external convention ===//
//
// 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/Common/Fortran.h"
#include "flang/Optimizer/Dialect/FIRDialect.h"
#include "flang/Optimizer/Dialect/FIROps.h"
#include "flang/Optimizer/Dialect/FIROpsSupport.h"
#include "flang/Optimizer/Support/InternalNames.h"
#include "flang/Optimizer/Transforms/Passes.h"
#include "mlir/IR/Attributes.h"
#include "mlir/IR/SymbolTable.h"
#include "mlir/Pass/Pass.h"
namespace fir {
#define GEN_PASS_DEF_EXTERNALNAMECONVERSION
#include "flang/Optimizer/Transforms/Passes.h.inc"
} // namespace fir
using namespace mlir;
//===----------------------------------------------------------------------===//
// Helper functions
//===----------------------------------------------------------------------===//
/// Mangle the name with gfortran convention.
std::string
mangleExternalName(const std::pair<fir::NameUniquer::NameKind,
fir::NameUniquer::DeconstructedName>
result,
bool appendUnderscore) {
if (result.first == fir::NameUniquer::NameKind::COMMON &&
result.second.name.empty())
return Fortran::common::blankCommonObjectName;
return Fortran::common::GetExternalAssemblyName(result.second.name,
appendUnderscore);
}
namespace {
class ExternalNameConversionPass
: public fir::impl::ExternalNameConversionBase<ExternalNameConversionPass> {
public:
using ExternalNameConversionBase<
ExternalNameConversionPass>::ExternalNameConversionBase;
mlir::ModuleOp getModule() { return getOperation(); }
void runOnOperation() override;
};
} // namespace
void ExternalNameConversionPass::runOnOperation() {
auto op = getOperation();
auto *context = &getContext();
llvm::DenseMap<mlir::StringAttr, mlir::FlatSymbolRefAttr> remappings;
// Update names of external Fortran functions and names of Common Block
// globals.
for (auto &funcOrGlobal : op->getRegion(0).front()) {
if (llvm::isa<mlir::func::FuncOp>(funcOrGlobal) ||
llvm::isa<fir::GlobalOp>(funcOrGlobal)) {
auto symName = funcOrGlobal.getAttrOfType<mlir::StringAttr>(
mlir::SymbolTable::getSymbolAttrName());
auto deconstructedName = fir::NameUniquer::deconstruct(symName);
if (fir::NameUniquer::isExternalFacingUniquedName(deconstructedName)) {
auto newName =
mangleExternalName(deconstructedName, appendUnderscoreOpt);
auto newAttr = mlir::StringAttr::get(context, newName);
mlir::SymbolTable::setSymbolName(&funcOrGlobal, newAttr);
auto newSymRef = mlir::FlatSymbolRefAttr::get(newAttr);
remappings.try_emplace(symName, newSymRef);
if (llvm::isa<mlir::func::FuncOp>(funcOrGlobal))
funcOrGlobal.setAttr(fir::getInternalFuncNameAttrName(), symName);
}
}
}
if (remappings.empty())
return;
// Update all uses of the functions and globals that have been renamed.
op.walk([&remappings](mlir::Operation *nestedOp) {
llvm::SmallVector<std::pair<mlir::StringAttr, mlir::SymbolRefAttr>> updates;
for (const mlir::NamedAttribute &attr : nestedOp->getAttrDictionary())
if (auto symRef = llvm::dyn_cast<mlir::SymbolRefAttr>(attr.getValue()))
if (auto remap = remappings.find(symRef.getRootReference());
remap != remappings.end())
updates.emplace_back(std::pair<mlir::StringAttr, mlir::SymbolRefAttr>{
attr.getName(), mlir::SymbolRefAttr(remap->second)});
for (auto update : updates)
nestedOp->setAttr(update.first, update.second);
});
}