Add 'third_party/nix/' from commit 'be66c7a6b24e3c3c6157fd37b86c7203d14acf10' r/724

git-subtree-dir: third_party/nix
git-subtree-mainline: cf8cd640c1adf74a3706efbcb0ea4625da106fb2
git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10

1 files changed, 52 insertions, 0 deletions

diff --git a/third_party/nix/src/libexpr/attr-set.cc b/third_party/nix/src/libexpr/attr-set.cc
new file mode 100644
index 0000000000..0785897d25
--- /dev/null
+++ b/third_party/nix/src/libexpr/attr-set.cc
@@ -0,0 +1,52 @@
+#include "attr-set.hh"
+#include "eval-inline.hh"
+
+#include <algorithm>
+
+
+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());
+}
+
+
+}