1 files changed, 39 insertions, 0 deletions
diff --git a/compiler/hashmap.c b/compiler/hashmap.c
new file mode 100644
index 0000000..0fb2e14
--- /dev/null
+++ b/compiler/hashmap.c
@@ -0,0 +1,39 @@
+/*
+ * Tiny hashmap implementation.
+ * Copyright (c) 2023-2024, Quinn Stephens and the OSMORA team.
+ * Provided under the BSD 3-Clause license.
+ */
+
+#include <stddef.h>
+#include "hashmap.h"
+
+void
+hashmap_add(struct hashmap *map, struct hashmap_entry *entry)
+{
+    list_prepend(&map->rows[entry->hash % map->n_rows], &entry->list_entry);
+}
+
+struct hashmap_entry *
+hashmap_find(struct hashmap *map, hash_t hash)
+{
+    struct hashmap_entry *head, *entry;
+
+    entry = head = (struct hashmap_entry*)(map->rows[hash % map->n_rows].head);
+    do {
+        if (entry->hash == hash) {
+            return entry;
+        }
+
+        entry = (struct hashmap_entry*)(entry->list_entry.next);
+    } while (entry != head);
+
+    return NULL;
+}
+
+void
+hashmap_init(struct hashmap *map)
+{
+    for (size_t r = 0; r < map->n_rows; r++) {
+        list_init(&map->rows[r]);
+    }
+}