Initial garbage colletor implementation

src/allocator.c

@@ -9,14 +9,46 @@
 /**
  * Initial value of #refcount_global_allocator.
  */
-static const RefcountAllocator default_allocator = {
+static const RefcountAllocator DEFAULT_ALLOCATOR = {
     .malloc = malloc,
-    .realloc = realloc,
     .free = free,
+    .pass_data = false,
+    .user_data = NULL,
 };
 
 /**
  * The global #RefcountAllocator used by other parts of RefCount. The default
- * value just calls the C standard functions malloc, realloc, and free.
+ * value just calls the C standard functions malloc and free.
  */
-const RefcountAllocator *refcount_global_allocator = &default_allocator;
+const RefcountAllocator *refcount_global_allocator = &DEFAULT_ALLOCATOR;
+
+/**
+ * HTAllocator malloc function that delegates to #refcount_malloc.
+ * @param size The number of bytes to allocate
+ * @parma alloc The #RefcountAllocator to use
+ * @return The result of #refcount_malloc
+ */
+static void *refcount_ht_malloc(size_t size, void *alloc) {
+    return refcount_malloc(alloc, size);
+}
+
+/**
+ * HTAllocator free function that delegates to #refcount_free.
+ * @param ptr The pointer to free
+ * @parma alloc The #RefcountAllocator to use
+ */
+static void refcount_ht_free(void *ptr, void *alloc) {
+    refcount_free(alloc, ptr);
+}
+
+/**
+ * Create a new HTAllocator that delegates to src.
+ * @param src The #RefcountAllocator to delegate to
+ * @param dest A pointer to a #HTAllocator to initialize
+ */
+void refcount_allocator_to_ht_allocator(const RefcountAllocator *src,
+                                        HTAllocator *dest) {
+    dest->malloc = refcount_ht_malloc;
+    dest->free = refcount_ht_free;
+    dest->user_data = (void *) src;
+}