[gtksourceview] build: add plumbing for sysprof-capture profiling

[Christian Hergert <chergert src gnome org>]

commit 2148d73217bec4e32604aed8d479f146157f5f2d
Author: Christian Hergert <chergert redhat com>
Date:   Tue Sep 22 17:12:08 2020 -0700

    build: add plumbing for sysprof-capture profiling
    
    This will allow us to do profiling with sysprof-capture-4's collector
    interface just like GTK does.

 gtksourceview/gtksourcetrace.h | 58 ++++++++++++++++++++++++++++++++++++++++++
 gtksourceview/meson.build      |  4 +++
 meson.build                    | 24 ++++++++++++++++-
 meson_options.txt              |  4 +++
 4 files changed, 89 insertions(+), 1 deletion(-)
---
diff --git a/gtksourceview/gtksourcetrace.h b/gtksourceview/gtksourcetrace.h
new file mode 100644
index 00000000..afee58f3
--- /dev/null
+++ b/gtksourceview/gtksourcetrace.h
@@ -0,0 +1,58 @@
+/*
+ * This file is part of GtkSourceView
+ *
+ * Copyright 2020 Christian Hergert <chergert redhat com>
+ *
+ * GtkSourceView is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * GtkSourceView 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#pragma once
+
+#include <glib.h>
+
+#ifndef GETTEXT_PACKAGE
+# error "config.h was not included before gtksourcetrace.h."
+#endif
+
+#ifdef HAVE_SYSPROF
+# include <sysprof-capture.h>
+#endif
+
+G_BEGIN_DECLS
+
+#ifdef HAVE_SYSPROF
+# define GTK_SOURCE_PROFILER_BEGIN_MARK \
+  G_STMT_START { \
+    gint64 __begin_time = SYSPROF_CAPTURE_CURRENT_TIME;
+# define GTK_SOURCE_PROFILER_END_MARK(name, message) \
+    G_STMT_START { \
+      gint64 __duration = SYSPROF_CAPTURE_CURRENT_TIME - __begin_time; \
+      sysprof_collector_mark (__begin_time, __duration, "GtkSourceView", name, message); \
+    } G_STMT_END; \
+  } G_STMT_END
+# define GTK_SOURCE_PROFILER_MARK(duration, name, message) \
+  G_STMT_START { \
+    sysprof_collector_mark (SYSPROF_CAPTURE_CURRENT_TIME - duration, \
+                            duration, "GtkSourceView", name, message) \
+  } G_STMT_END
+#else
+# define GTK_SOURCE_PROFILER_MARK(duration, name, message) \
+  G_STMT_START { } G_STMT_END
+# define GTK_SOURCE_PROFILER_BEGIN_MARK G_STMT_START {
+# define GTK_SOURCE_PROFILER_END_MARK(name, message) } G_STMT_END
+#endif
+
+G_END_DECLS
diff --git a/gtksourceview/meson.build b/gtksourceview/meson.build
index d7f923a0..d5df1a75 100644
--- a/gtksourceview/meson.build
+++ b/gtksourceview/meson.build
@@ -137,6 +137,10 @@ core_deps = [
   fontconfig_dep,
 ]
 
+if profiler_enabled
+  core_deps += [libsysprof_capture_dep]
+endif
+
 if config_h.has('OS_OSX')
   core_c_args += '-xobjective-c'
   core_deps += [
diff --git a/meson.build b/meson.build
index 6732eea3..ae334942 100644
--- a/meson.build
+++ b/meson.build
@@ -122,7 +122,7 @@ glib_version_arr = glib_req_version.split('.')
 glib_major_version = glib_version_arr[0]
 glib_minor_version = glib_version_arr[1]
 
-# Override until GTK 4 is released
+# XXX: Override until GTK 4 is released
 gtk_version_arr = gtk_req_version.split('.')
 gtk_major_version = '4' # gtk_version_arr[0]
 gtk_minor_version = '0' # gtk_version_arr[1]
@@ -159,6 +159,28 @@ foreach header: check_headers
   endif
 endforeach
 
+# libsysprof-capture support
+if get_option('sysprof')
+  libsysprof_capture_dep = dependency('sysprof-capture-4',
+    required: get_option('sysprof'),
+    default_options: [
+      'enable_examples=false',
+      'enable_gtk=false',
+      'enable_tests=false',
+      'enable_tools=false',
+      'libsysprof=true',
+      'with_sysprofd=none',
+      'help=false',
+    ],
+    fallback: ['sysprof', 'libsysprof_capture_dep'],
+  )
+  config_h.set('HAVE_SYSPROF', libsysprof_capture_dep.found())
+  profiler_enabled = true
+else
+  libsysprof_capture_dep = disabler()
+  profiler_enabled = false
+endif
+
 if build_machine.system() == 'darwin' and gtk_quartz_dep.found()
   cocoa_dep = dependency('appleframeworks', modules: 'Cocoa', required: false)
   assert(cocoa_dep.found(), 'Dependency appleframeworks not found')
diff --git a/meson_options.txt b/meson_options.txt
index 2ded0af0..443f0476 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -13,3 +13,7 @@ option('vapi',
 option('gtk_doc',
        type: 'boolean', value: false,
        description: 'Build reference manual (requires gtk-doc)')
+
+option('sysprof',
+       type: 'boolean', value: false,
+       description: 'Build with sysprof profiler support')