Dynamic definition scope hierarchy
[babeltrace.git] / types / types.c
index 208b303f1e00c270694572ee48a1667db0a01001..227a1e5e3125976730b79197a987e291e82a1714 100644 (file)
@@ -147,12 +147,17 @@ static struct definition_scope *
 
 /*
  * OK, here is the fun. We want to lookup a field that is:
- * - either in the current scope, but prior to the current field.
- * - or in a parent scope (or parent of parent ...) still in a field
- *   prior to the current field position within the parents.
- * A reaching through a dynamic scoping (e.g. from payload structure to
- * event header structure), the parent fields are always entirely prior
- * to the child.
+ * - either in the same dynamic scope:
+ *   - either in the current scope, but prior to the current field.
+ *   - or in a parent scope (or parent of parent ...) still in a field
+ *     prior to the current field position within the parents.
+ * - or in a different dynamic scope:
+ *   - either in a upper dynamic scope (walk down a targeted scope from
+ *     the dynamic scope root)
+ *   - or in a lower dynamic scope (failure)
+ * The dynamic scope roots are linked together, so we can access the
+ * parent dynamic scope from the child dynamic scope by walking up to
+ * the parent.
  * If we cannot find such a field that is prior to our current path, we
  * return NULL.
  *
@@ -406,30 +411,54 @@ int register_enum_declaration(GQuark enum_name,
        return 0;
 }
 
-struct definition_scope *
-       new_definition_scope(struct definition_scope *parent_scope,
-                            GQuark field_name)
+static struct definition_scope *
+       _new_definition_scope(struct definition_scope *parent_scope,
+                             int scope_path_len)
 {
        struct definition_scope *scope = g_new(struct definition_scope, 1);
-       int scope_path_len = 1;
 
        scope->definitions = g_hash_table_new_full(g_direct_hash,
                                        g_direct_equal, NULL,
                                        (GDestroyNotify) definition_unref);
        scope->parent_scope = parent_scope;
-       if (scope->parent_scope)
-               scope_path_len += scope->parent_scope->scope_path->len;
        scope->scope_path = g_array_sized_new(FALSE, TRUE, sizeof(GQuark),
                                              scope_path_len);
        g_array_set_size(scope->scope_path, scope_path_len);
-       if (scope->parent_scope)
-               memcpy(scope->scope_path, scope->parent_scope->scope_path,
+       return scope;
+}
+
+struct definition_scope *
+       new_definition_scope(struct definition_scope *parent_scope,
+                            GQuark field_name)
+{
+       struct definition_scope *scope;
+       int scope_path_len = 1;
+
+       if (parent_scope)
+               scope_path_len += parent_scope->scope_path->len;
+       scope = _new_definition_scope(parent_scope, scope_path_len);
+       if (parent_scope)
+               memcpy(scope->scope_path, parent_scope->scope_path,
                       sizeof(GQuark) * (scope_path_len - 1));
        g_array_index(scope->scope_path, GQuark, scope_path_len - 1) =
                field_name;
        return scope;
 }
 
+/*
+ * Same as new_definition_scope, but reset the scope path.
+ */
+struct definition_scope *
+       new_dynamic_definition_scope(struct definition_scope *parent_scope,
+                                    GQuark field_name)
+{
+       struct definition_scope *scope;
+
+       scope = _new_definition_scope(parent_scope, 1);
+       g_array_index(scope->scope_path, GQuark, 0) = field_name;
+       return scope;
+}
+
 void free_definition_scope(struct definition_scope *scope)
 {
        g_array_free(scope->scope_path, TRUE);
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