DBT-RISE-TGC/src/iss/factory.h

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#ifndef _ISS_FACTORY_H_
#define _ISS_FACTORY_H_

#include <iss/iss.h>
#include <memory>
#include <unordered_map>
#include <functional>
#include <string>
#include <algorithm>
#include <vector>

namespace iss {

using cpu_ptr = std::unique_ptr<iss::arch_if>;
using vm_ptr= std::unique_ptr<iss::vm_if>;

template<typename PLAT>
std::tuple<cpu_ptr, vm_ptr> create_cpu(std::string const& backend, unsigned gdb_port){
    using core_type = typename PLAT::core;
    core_type* lcpu = new PLAT();
    if(backend == "interp")
        return {cpu_ptr{lcpu}, vm_ptr{iss::interp::create(lcpu, gdb_port)}};
#ifdef WITH_LLVM
    if(backend == "llvm")
        return {cpu_ptr{lcpu}, vm_ptr{iss::llvm::create(lcpu, gdb_port)}};
#endif
#ifdef WITH_TCC
    if(backend == "tcc")
        return {cpu_ptr{lcpu}, vm_ptr{iss::tcc::create(lcpu, gdb_port)}};
#endif
    return {nullptr, nullptr};
}


class core_factory {
    using cpu_ptr = std::unique_ptr<iss::arch_if>;
    using vm_ptr= std::unique_ptr<iss::vm_if>;
    using base_t = std::tuple<cpu_ptr, vm_ptr>;
    using create_fn = std::function<base_t(unsigned, void*) >;
    using registry_t = std::unordered_map<std::string, create_fn> ;

    registry_t registry;

    core_factory() = default;
    core_factory(const core_factory &) = delete;
    core_factory & operator=(const core_factory &) = delete;

public:
    static core_factory & instance() { static core_factory bf; return bf; }

    bool register_creator(const std::string & className, create_fn const& fn) {
        registry[className] = fn;
        return true;
    }

    base_t create(std::string const& className, unsigned gdb_port=0, void* init_data=nullptr) const {
        registry_t::const_iterator regEntry = registry.find(className);
        if (regEntry != registry.end())
            return regEntry->second(gdb_port, init_data);
        return {nullptr, nullptr};
    }

    std::vector<std::string> get_names() {
        std::vector<std::string> keys{registry.size()};
        std::transform(std::begin(registry), std::end(registry), std::begin(keys), [](std::pair<std::string, create_fn> const& p){
            return p.first;
        });
        return keys;
    }
};

}

#endif /* _ISS_FACTORY_H_ */