libsysprof-analyze: break out string helper

We'll want strings to be deduplicated a bunch, and may need to pass this
around to make that a bit easier to ensure.

src/libsysprof-analyze/meson.build

@@ -28,6 +28,7 @@ libsysprof_analyze_private_sources = [
   'sysprof-mount.c',
   'sysprof-mount-device.c',
   'sysprof-mount-namespace.c',
+  'sysprof-strings.c',
 ]
 
 libsysprof_analyze_public_headers = [

src/libsysprof-analyze/sysprof-document.c

@@ -35,6 +35,7 @@
 #include "sysprof-mount-private.h"
 #include "sysprof-mount-device-private.h"
 #include "sysprof-mount-namespace-private.h"
+#include "sysprof-strings-private.h"
 #include "sysprof-symbolizer-private.h"
 
 #include "line-reader-private.h"
@@ -47,6 +48,8 @@ struct _SysprofDocument
   GMappedFile              *mapped_file;
   const guint8             *base;
 
+  SysprofStrings           *strings;
+
   GtkBitset                *file_chunks;
   GtkBitset                *traceables;
   GtkBitset                *processes;
@@ -58,9 +61,6 @@ struct _SysprofDocument
 
   SysprofMountNamespace    *mount_namespace;
 
-  GMutex                    strings_mutex;
-  GHashTable               *strings;
-
   SysprofCaptureFileHeader  header;
   guint                     needs_swap : 1;
 };
@@ -150,11 +150,12 @@ sysprof_document_finalize (GObject *object)
 {
   SysprofDocument *self = (SysprofDocument *)object;
 
+  g_clear_pointer (&self->strings, sysprof_strings_unref);
+
   g_clear_pointer (&self->pid_to_mmaps, g_hash_table_unref);
   g_clear_pointer (&self->pid_to_mountinfo, g_hash_table_unref);
   g_clear_pointer (&self->mapped_file, g_mapped_file_unref);
   g_clear_pointer (&self->frames, g_array_unref);
-  g_clear_pointer (&self->strings, g_hash_table_unref);
 
   g_clear_pointer (&self->traceables, gtk_bitset_unref);
   g_clear_pointer (&self->processes, gtk_bitset_unref);
@@ -165,8 +166,6 @@ sysprof_document_finalize (GObject *object)
 
   g_clear_pointer (&self->files_first_position, g_hash_table_unref);
 
-  g_mutex_clear (&self->strings_mutex);
-
   G_OBJECT_CLASS (sysprof_document_parent_class)->finalize (object);
 }
 static void
@@ -180,11 +179,9 @@ sysprof_document_class_init (SysprofDocumentClass *klass)
 static void
 sysprof_document_init (SysprofDocument *self)
 {
-  g_mutex_init (&self->strings_mutex);
+  self->strings = sysprof_strings_new ();
 
   self->frames = g_array_new (FALSE, FALSE, sizeof (SysprofDocumentFramePointer));
-  self->strings = g_hash_table_new_full (g_str_hash, g_str_equal, NULL,
-                                         (GDestroyNotify)g_ref_string_release);
 
   self->traceables = gtk_bitset_new_empty ();
   self->file_chunks = gtk_bitset_new_empty ();
@@ -549,23 +546,9 @@ char *
 _sysprof_document_ref_string (SysprofDocument *self,
                               const char      *name)
 {
-  char *ret;
-
   g_return_val_if_fail (SYSPROF_IS_DOCUMENT (self), NULL);
 
-  if (name == NULL)
-    return NULL;
-
-  g_mutex_lock (&self->strings_mutex);
-  if (!(ret = g_hash_table_lookup (self->strings, name)))
-    {
-      ret = g_ref_string_new (name);
-      g_hash_table_insert (self->strings, ret, ret);
-    }
-  ret = g_ref_string_acquire (ret);
-  g_mutex_unlock (&self->strings_mutex);
-
-  return ret;
+  return sysprof_strings_get (self->strings, name);
 }
 
 static void

src/libsysprof-analyze/sysprof-strings-private.h

@@ -0,0 +1,37 @@
+/* sysprof-strings-private.h
+ *
+ * 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
+ */
+
+#pragma once
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+typedef struct _SysprofStrings SysprofStrings;
+
+SysprofStrings *sysprof_strings_new    (void);
+SysprofStrings *sysprof_strings_ref    (SysprofStrings *self);
+void            sysprof_strings_unref  (SysprofStrings *self);
+GRefString     *sysprof_strings_get    (SysprofStrings *self,
+                                        const char     *string);
+GRefString     *sysprof_strings_lookup (SysprofStrings *self,
+                                        const char     *string);
+
+G_END_DECLS

src/libsysprof-analyze/sysprof-strings.c

@@ -0,0 +1,96 @@
+/* sysprof-strings.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-strings-private.h"
+
+struct _SysprofStrings
+{
+  GMutex      mutex;
+  GHashTable *hashtable;
+};
+
+SysprofStrings *
+sysprof_strings_new (void)
+{
+  SysprofStrings *self;
+
+  self = g_atomic_rc_box_new0 (SysprofStrings);
+  g_mutex_init (&self->mutex);
+  self->hashtable = g_hash_table_new_full (g_str_hash,
+                                           g_str_equal,
+                                           (GDestroyNotify)g_ref_string_release,
+                                           NULL);
+
+  return self;
+}
+
+SysprofStrings *
+sysprof_strings_ref (SysprofStrings *self)
+{
+  return g_atomic_rc_box_acquire (self);
+}
+
+static void
+sysprof_strings_finalize (gpointer data)
+{
+  SysprofStrings *self = data;
+
+  g_mutex_clear (&self->mutex);
+  g_clear_pointer (&self->hashtable, g_hash_table_unref);
+}
+
+void
+sysprof_strings_unref (SysprofStrings *self)
+{
+  g_atomic_rc_box_release_full (self, sysprof_strings_finalize);
+}
+
+GRefString *
+sysprof_strings_get (SysprofStrings *self,
+                     const char     *string)
+{
+  GRefString *ret;
+
+  g_mutex_lock (&self->mutex);
+  if (!(ret = g_hash_table_lookup (self->hashtable, string)))
+    {
+      ret = g_ref_string_new (string);
+      g_hash_table_insert (self->hashtable, ret, ret);
+    }
+  g_ref_string_acquire (ret);
+  g_mutex_unlock (&self->mutex);
+
+  return ret;
+}
+
+GRefString *
+sysprof_strings_lookup (SysprofStrings *self,
+                        const char     *string)
+{
+  GRefString *ret;
+
+  g_mutex_lock (&self->mutex);
+  ret = g_hash_table_lookup (self->hashtable, string);
+  g_mutex_unlock (&self->mutex);
+
+  return ret;
+}