lix/src/libexpr/eval-inline.hh

#pragma once

#include "eval.hh"

#define LocalNoInline(f) static f __attribute__((noinline)); f
#define LocalNoInlineNoReturn(f) static f __attribute__((noinline, noreturn)); f

namespace nix {

LocalNoInlineNoReturn(void throwEvalError(const char * s, const Pos & pos))
{
    throw EvalError(s, pos);
}

LocalNoInlineNoReturn(void throwTypeError(const char * s, const Value & v))
{
    throw TypeError(s, showType(v));
}


LocalNoInlineNoReturn(void throwTypeError(const char * s, const Value & v, const Pos & pos))
{
    throw TypeError(s, showType(v), pos);
}


void EvalState::forceValue(Value & v, const Pos & pos)
{
    if (v.type == tThunk) {
        Env * env = v.thunk.env;
        Expr * expr = v.thunk.expr;
        try {
            v.type = tBlackhole;
            //checkInterrupt();
            expr->eval(*this, *env, v);
        } catch (...) {
            v.type = tThunk;
            v.thunk.env = env;
            v.thunk.expr = expr;
            throw;
        }
    }
    else if (v.type == tApp)
        callFunction(*v.app.left, *v.app.right, v, noPos);
    else if (v.type == tBlackhole)
        throwEvalError("infinite recursion encountered, at %1%", pos);
}


inline void EvalState::forceAttrs(Value & v)
{
    forceValue(v);
    if (v.type != tAttrs)
        throwTypeError("value is %1% while a set was expected", v);
}


inline void EvalState::forceAttrs(Value & v, const Pos & pos)
{
    forceValue(v);
    if (v.type != tAttrs)
        throwTypeError("value is %1% while a set was expected, at %2%", v, pos);
}


inline void EvalState::forceList(Value & v)
{
    forceValue(v);
    if (!v.isList())
        throwTypeError("value is %1% while a list was expected", v);
}


inline void EvalState::forceList(Value & v, const Pos & pos)
{
    forceValue(v);
    if (!v.isList())
        throwTypeError("value is %1% while a list was expected, at %2%", v, pos);
}

/* Note: Various places expect the allocated memory to be zeroed. */
inline void * allocBytes(size_t n)
{
    void * p;
#if HAVE_BOEHMGC
    p = GC_MALLOC(n);
#else
    p = calloc(n, 1);
#endif
    if (!p) throw std::bad_alloc();
    return p;
}


}