From 8c28be1b69a66f16fd1c711931b5a6f6948a8a2a Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@google.com>
Date: Fri, 22 May 2020 23:43:44 +0100
Subject: fix(3p/nix/libexpr): Use gc_allocator<T> as the btree_map allocator

This will make all Attr values visible to the GC.
---
 third_party/nix/src/libexpr/attr-set.hh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'third_party')

diff --git a/third_party/nix/src/libexpr/attr-set.hh b/third_party/nix/src/libexpr/attr-set.hh
index caddc6bebd61..5837b5cbdc9c 100644
--- a/third_party/nix/src/libexpr/attr-set.hh
+++ b/third_party/nix/src/libexpr/attr-set.hh
@@ -2,10 +2,11 @@
 #pragma once
 
 #include <absl/container/btree_map.h>
+#include <gc/gc_allocator.h>
 
 #include "nixexpr.hh"
 #include "symbol-table.hh"
-#include "types.hh"  // TODO(tazjin): audit this include
+#include "types.hh"
 
 namespace nix {  // TODO(tazjin): ::expr
 
@@ -29,6 +30,12 @@ inline bool operator==(const Attr& lhs, const Attr& rhs) {
   return lhs.name == rhs.name;
 }
 
+// Convenience alias for the backing map, with the garbage-collecting
+// allocator explicitly specified.
+using AttributeMap =
+    absl::btree_map<Symbol, Attr, std::less<Symbol>,
+                    gc_allocator<std::pair<const Symbol, Attr>>>;
+
 class Bindings {
  public:
   typedef absl::btree_map<Symbol, Attr>::iterator iterator;
-- 
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