libsysprof-analyze: add SysprofNoSymbolizer

A symbolizer that will never symbolize. We can use this later internally
to short-circuit various symoblization steps during loading.

src/libsysprof-analyze/sysprof-no-symbolizer.c

@@ -0,0 +1,58 @@
+/* sysprof-no-symbolizer.c
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "config.h"
+
+#include "sysprof-no-symbolizer.h"
+
+struct _SysprofNoSymbolizer
+{
+  SysprofSymbolizer parent_instance;
+};
+
+G_DEFINE_FINAL_TYPE (SysprofNoSymbolizer, sysprof_no_symbolizer, SYSPROF_TYPE_SYMBOLIZER)
+
+static SysprofSymbol *
+sysprof_no_symbolizer_symbolize (SysprofSymbolizer        *symbolizer,
+                                 SysprofStrings           *strings,
+                                 const SysprofProcessInfo *process_info,
+                                 SysprofAddress            address)
+{
+  return NULL;
+}
+
+static void
+sysprof_no_symbolizer_class_init (SysprofNoSymbolizerClass *klass)
+{
+  SysprofSymbolizerClass *symbolizer_class = SYSPROF_SYMBOLIZER_CLASS (klass);
+
+  symbolizer_class->symbolize = sysprof_no_symbolizer_symbolize;
+}
+
+static void
+sysprof_no_symbolizer_init (SysprofNoSymbolizer *self)
+{
+}
+
+SysprofSymbolizer *
+sysprof_no_symbolizer_new (void)
+{
+  return g_object_new (SYSPROF_TYPE_NO_SYMBOLIZER, NULL);
+}