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//=== RegistryParser.h - Linker-supported plugin registries -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Defines a command-line parser for a registry.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_REGISTRYPARSER_H
#define LLVM_SUPPORT_REGISTRYPARSER_H
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Registry.h"
namespace llvm {
/// A command-line parser for a registry. Use like such:
///
/// static cl::opt<Registry<Collector>::entry, false,
/// RegistryParser<Collector> >
/// GCOpt("gc", cl::desc("Garbage collector to use."),
/// cl::value_desc());
///
/// To make use of the value:
///
/// Collector *TheCollector = GCOpt->instantiate();
///
template <typename T, typename U = RegistryTraits<T> >
class RegistryParser :
public cl::parser<const typename U::entry*>,
public Registry<T, U>::listener {
typedef U traits;
typedef typename U::entry entry;
typedef typename Registry<T, U>::listener listener;
protected:
void registered(const entry &E) {
addLiteralOption(traits::nameof(E), &E, traits::descof(E));
}
public:
void initialize(cl::Option &O) {
listener::init();
cl::parser<const typename U::entry*>::initialize(O);
}
};
}
#endif // LLVM_SUPPORT_REGISTRYPARSER_H
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