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//===-- Mangler.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/Mangler.h"
#include "flang/Common/reference.h"
#include "flang/Lower/Utils.h"
#include "flang/Optimizer/Dialect/FIRType.h"
#include "flang/Optimizer/Support/InternalNames.h"
#include "flang/Semantics/tools.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
// recursively build the vector of module scopes
static void moduleNames(const Fortran::semantics::Scope &scope,
llvm::SmallVector<llvm::StringRef, 2> &result) {
if (scope.kind() == Fortran::semantics::Scope::Kind::Global) {
return;
}
moduleNames(scope.parent(), result);
if (scope.kind() == Fortran::semantics::Scope::Kind::Module)
if (auto *symbol = scope.symbol())
result.emplace_back(toStringRef(symbol->name()));
}
static llvm::SmallVector<llvm::StringRef, 2>
moduleNames(const Fortran::semantics::Symbol &symbol) {
const auto &scope = symbol.owner();
llvm::SmallVector<llvm::StringRef, 2> result;
moduleNames(scope, result);
return result;
}
static llvm::Optional<llvm::StringRef>
hostName(const Fortran::semantics::Symbol &symbol) {
const auto &scope = symbol.owner();
if (scope.kind() == Fortran::semantics::Scope::Kind::Subprogram) {
assert(scope.symbol() && "subprogram scope must have a symbol");
return {toStringRef(scope.symbol()->name())};
}
return {};
}
static const Fortran::semantics::Symbol *
findInterfaceIfSeperateMP(const Fortran::semantics::Symbol &symbol) {
const auto &scope = symbol.owner();
if (symbol.attrs().test(Fortran::semantics::Attr::MODULE) &&
scope.IsSubmodule()) {
// FIXME symbol from MpSubprogramStmt do not seem to have
// Attr::MODULE set.
const auto *iface = scope.parent().FindSymbol(symbol.name());
assert(iface && "Separate module procedure must be declared");
return iface;
}
return nullptr;
}
// Mangle the name of `symbol` to make it unique within FIR's symbol table using
// the FIR name mangler, `mangler`
std::string
Fortran::lower::mangle::mangleName(fir::NameUniquer &uniquer,
const Fortran::semantics::Symbol &symbol) {
// Resolve host and module association before mangling
const auto &ultimateSymbol = symbol.GetUltimate();
auto symbolName = toStringRef(ultimateSymbol.name());
return std::visit(
Fortran::common::visitors{
[&](const Fortran::semantics::MainProgramDetails &) {
return uniquer.doProgramEntry().str();
},
[&](const Fortran::semantics::SubprogramDetails &) {
// Mangle external procedure without any scope prefix.
if (Fortran::semantics::IsExternal(ultimateSymbol))
return uniquer.doProcedure(llvm::None, llvm::None, symbolName);
// Separate module subprograms must be mangled according to the
// scope where they were declared (the symbol we have is the
// definition).
const auto *interface = &ultimateSymbol;
if (const auto *mpIface = findInterfaceIfSeperateMP(ultimateSymbol))
interface = mpIface;
auto modNames = moduleNames(*interface);
return uniquer.doProcedure(modNames, hostName(*interface),
symbolName);
},
[&](const Fortran::semantics::ProcEntityDetails &) {
// Mangle procedure pointers and dummy procedures as variables
if (Fortran::semantics::IsPointer(ultimateSymbol) ||
Fortran::semantics::IsDummy(ultimateSymbol))
return uniquer.doVariable(moduleNames(ultimateSymbol),
hostName(ultimateSymbol), symbolName);
// Otherwise, this is an external procedure, even if it does not
// have an explicit EXTERNAL attribute. Mangle it without any
// prefix.
return uniquer.doProcedure(llvm::None, llvm::None, symbolName);
},
[&](const Fortran::semantics::ObjectEntityDetails &) {
auto modNames = moduleNames(ultimateSymbol);
auto optHost = hostName(ultimateSymbol);
if (Fortran::semantics::IsNamedConstant(ultimateSymbol))
return uniquer.doConstant(modNames, optHost, symbolName);
return uniquer.doVariable(modNames, optHost, symbolName);
},
[](const auto &) -> std::string {
assert(false);
return {};
},
},
ultimateSymbol.details());
}
std::string Fortran::lower::mangle::demangleName(llvm::StringRef name) {
auto result = fir::NameUniquer::deconstruct(name);
return result.second.name;
}
//===----------------------------------------------------------------------===//
// Intrinsic Procedure Mangling
//===----------------------------------------------------------------------===//
/// Helper to encode type into string for intrinsic procedure names.
/// Note: mlir has Type::dump(ostream) methods but it may add "!" that is not
/// suitable for function names.
static std::string typeToString(mlir::Type t) {
if (auto refT{t.dyn_cast<fir::ReferenceType>()})
return "ref_" + typeToString(refT.getEleTy());
if (auto i{t.dyn_cast<mlir::IntegerType>()}) {
return "i" + std::to_string(i.getWidth());
}
if (auto cplx{t.dyn_cast<fir::CplxType>()}) {
return "z" + std::to_string(cplx.getFKind());
}
if (auto real{t.dyn_cast<fir::RealType>()}) {
return "r" + std::to_string(real.getFKind());
}
if (auto f{t.dyn_cast<mlir::FloatType>()}) {
return "f" + std::to_string(f.getWidth());
}
if (auto logical{t.dyn_cast<fir::LogicalType>()}) {
return "l" + std::to_string(logical.getFKind());
}
if (auto character{t.dyn_cast<fir::CharacterType>()}) {
return "c" + std::to_string(character.getFKind());
}
if (auto boxCharacter{t.dyn_cast<fir::BoxCharType>()}) {
return "bc" + std::to_string(boxCharacter.getEleTy().getFKind());
}
llvm_unreachable("no mangling for type");
}
std::string fir::mangleIntrinsicProcedure(llvm::StringRef intrinsic,
mlir::FunctionType funTy) {
std::string name = "fir.";
name.append(intrinsic.str()).append(".");
assert(funTy.getNumResults() == 1 && "only function mangling supported");
name.append(typeToString(funTy.getResult(0)));
auto e = funTy.getNumInputs();
for (decltype(e) i = 0; i < e; ++i)
name.append(".").append(typeToString(funTy.getInput(i)));
return name;
}
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