From db21cfa68820ed06f176aaf54e0ee5ce023951f7 Mon Sep 17 00:00:00 2001
From: "Nicolas B. Pierron" <nicolas.b.pierron@gmail.com>
Date: Tue, 14 Jul 2015 19:18:56 +0200
Subject: Move attribute set data structures into their own header file.

This modification moves Attr and Bindings structures into their own header
file which is dedicated to the attribute set representation. The goal of to
isolate pieces of code which are related to the attribute set
representation. Thus future modifications of the attribute set
representation will only have to modify these files, and not every other
file across the evaluator.
---
 src/libexpr/attr-set.cc | 59 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/libexpr/attr-set.cc

(limited to 'src/libexpr/attr-set.cc')

diff --git a/src/libexpr/attr-set.cc b/src/libexpr/attr-set.cc
new file mode 100644
index 000000000..9ac5e6031
--- /dev/null
+++ b/src/libexpr/attr-set.cc
@@ -0,0 +1,59 @@
+#include "attr-set.hh"
+#include "eval.hh"
+
+#include <algorithm>
+
+
+namespace nix {
+
+
+static void * allocBytes(size_t n)
+{
+    void * p;
+#if HAVE_BOEHMGC
+    p = GC_malloc(n);
+#else
+    p = malloc(n);
+#endif
+    if (!p) throw std::bad_alloc();
+    return p;
+}
+
+
+/* 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(Bindings::size_t capacity)
+{
+    return new (allocBytes(sizeof(Bindings) + sizeof(Attr) * capacity)) Bindings(capacity);
+}
+
+
+void EvalState::mkAttrs(Value & v, unsigned int expected)
+{
+    clearValue(v);
+    v.type = tAttrs;
+    v.attrs = allocBindings(expected);
+    nrAttrsets++;
+    nrAttrsInAttrsets += expected;
+}
+
+
+/* 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());
+}
+
+
+}
-- 
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