lix/src/libexpr/primops.hh
2020-10-06 10:40:07 +02:00

47 lines
1.2 KiB
C++

#pragma once
#include "eval.hh"
#include <tuple>
#include <vector>
namespace nix {
struct RegisterPrimOp
{
struct Info
{
std::string name;
std::vector<std::string> args;
size_t arity = 0;
const char * doc;
std::optional<std::string> requiredFeature;
PrimOpFun fun;
};
typedef std::vector<Info> PrimOps;
static PrimOps * primOps;
/* You can register a constant by passing an arity of 0. fun
will get called during EvalState initialization, so there
may be primops not yet added and builtins is not yet sorted. */
RegisterPrimOp(
std::string name,
size_t arity,
PrimOpFun fun,
std::optional<std::string> requiredFeature = {});
RegisterPrimOp(Info && info);
};
/* These primops are disabled without enableNativeCode, but plugins
may wish to use them in limited contexts without globally enabling
them. */
/* Load a ValueInitializer from a DSO and return whatever it initializes */
void prim_importNative(EvalState & state, const Pos & pos, Value * * args, Value & v);
/* Execute a program and parse its output */
void prim_exec(EvalState & state, const Pos & pos, Value * * args, Value & v);
}