Profiler: Add source code view

This adds a new view mode to profiler which displays source lines and
samples that occured at those lines. This view can be opened via the
menu or by pressing CTRL-S.

It does this by mapping file names from DWARF to "/usr/src/serenity/..."
i.e. source code should be copied to /usr/src/serenity/Userland and
/usr/src/serenity/Kernel to be visible in this mode.

Currently *all* files contributing to the selected function are loaded
completely which could be a lot of data when dealing with lots of
inlined code.

1 files changed, 54 insertions, 0 deletions

diff --git a/Userland/DevTools/Profiler/SourceModel.h b/Userland/DevTools/Profiler/SourceModel.h
new file mode 100644
index 0000000000..9e2fa08f9f
--- /dev/null
+++ b/Userland/DevTools/Profiler/SourceModel.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/Model.h>
+
+namespace Profiler {
+
+class Profile;
+class ProfileNode;
+
+struct SourceLineData {
+    u32 event_count { 0 };
+    float percent { 0 };
+    String location;
+    u32 line_number { 0 };
+    String source_code;
+};
+
+class SourceModel final : public GUI::Model {
+public:
+    static NonnullRefPtr<SourceModel> create(Profile& profile, ProfileNode& node)
+    {
+        return adopt_ref(*new SourceModel(profile, node));
+    }
+
+    enum Column {
+        SampleCount,
+        Location,
+        LineNumber,
+        SourceCode,
+        __Count
+    };
+
+    virtual int row_count(GUI::ModelIndex const& = GUI::ModelIndex()) const override;
+    virtual int column_count(GUI::ModelIndex const& = GUI::ModelIndex()) const override { return Column::__Count; }
+    virtual String column_name(int) const override;
+    virtual GUI::Variant data(GUI::ModelIndex const&, GUI::ModelRole) const override;
+    virtual bool is_column_sortable(int) const override { return false; }
+
+private:
+    SourceModel(Profile&, ProfileNode&);
+
+    Profile& m_profile;
+    ProfileNode& m_node;
+
+    Vector<SourceLineData> m_source_lines;
+};
+
+}