Cleaned up some memory leaks, got rid of gsequence, improved test macro to free memory that it allocated

src/datastructures.c

@@ -0,0 +1,32 @@
+#include "internal.h"
+#include "hammer.h"
+#include "allocator.h"
+#include <assert.h>
+#include <malloc.h>
+// {{{ counted arrays
+
+
+counted_array_t *carray_new_sized(arena_t arena, size_t size) {
+  counted_array_t *ret = arena_malloc(arena, sizeof(counted_array_t));
+  assert(size > 0);
+  ret->used = 0;
+  ret->capacity = size;
+  ret->arena = arena;
+  ret->elements = arena_malloc(arena, sizeof(void*) * size);
+  return ret;
+}
+counted_array_t *carray_new(arena_t arena) {
+  return carray_new_sized(arena, 4);
+}
+
+void carray_append(counted_array_t *array, void* item) {
+  if (array->used >= array->capacity) {
+    void **elements = arena_malloc(array->arena, (array->capacity *= 2) * sizeof(counted_array_t*));
+    for (size_t i = 0; i < array->used; i++)
+      elements[i] = array->elements[i];
+    for (size_t i = array->used; i < array->capacity; i++)
+      elements[i] = 0;
+    array->elements = elements;
+  }
+  array->elements[array->used++] = item;
+}