path: root/third_party/nix/src/libexpr/attr-set.cc

#include "attr-set.hh"
#include <algorithm>
#include "eval-inline.hh"

namespace nix {

/* Allocate a new array of attributes for an attribute set with a specific
   capacity. The space is implicitly reserved after the Bindings
   structure. */
Bindings* EvalState::allocBindings(size_t capacity) {
  if (capacity > std::numeric_limits<Bindings::size_t>::max())
    throw Error("attribute set of size %d is too big", capacity);
  return new (allocBytes(sizeof(Bindings) + sizeof(Attr) * capacity))
      Bindings((Bindings::size_t)capacity);
}

void EvalState::mkAttrs(Value& v, size_t capacity) {
  if (capacity == 0) {
    v = vEmptySet;
    return;
  }
  clearValue(v);
  v.type = tAttrs;
  v.attrs = allocBindings(capacity);
  nrAttrsets++;
  nrAttrsInAttrsets += capacity;
}

/* Create a new attribute named 'name' on an existing attribute set stored
   in 'vAttrs' and return the newly allocated Value which is associated with
   this attribute. */
Value* EvalState::allocAttr(Value& vAttrs, const Symbol& name) {
  Value* v = allocValue();
  vAttrs.attrs->push_back(Attr(name, v));
  return v;
}

void Bindings::sort() { std::sort(begin(), end()); }

}  // namespace nix