Sprinkle use of AK::Vector in various places.

Some of these are less helpful than others. Avoiding a bunch of mallocs
in the event loop wakeup code is definitely nice.

Applications/FileManager/DirectoryModel.cpp

@@ -26,6 +26,7 @@ int thumbnail_thread(void* model_ptr)
         Vector<String> to_generate;
         {
             LOCKER(thumbnail_cache().lock());
+            to_generate.ensure_capacity(thumbnail_cache().resource().size());
             for (auto& it : thumbnail_cache().resource()) {
                 if (it.value)
                     continue;

Applications/IRCClient/IRCClient.cpp

@@ -87,9 +87,9 @@ void IRCClient::receive_from_server()
 void IRCClient::process_line(ByteBuffer&& line)
 {
     Message msg;
-    Vector<char> prefix;
-    Vector<char> command;
-    Vector<char> current_parameter;
+    Vector<char, 32> prefix;
+    Vector<char, 32> command;
+    Vector<char, 256> current_parameter;
     enum {
         Start,
         InPrefix,

Applications/ProcessManager/ProcessModel.cpp

@@ -193,7 +193,7 @@ void ProcessModel::update()
     }
 
     m_pids.clear();
-    Vector<pid_t> pids_to_remove;
+    Vector<pid_t, 16> pids_to_remove;
     for (auto& it : m_processes) {
         if (!live_pids.contains(it.key)) {
             pids_to_remove.append(it.key);

Applications/Terminal/Terminal.cpp

@@ -136,7 +136,7 @@ static inline Color lookup_color(unsigned color)
     return Color::from_rgb(xterm_colors[color]);
 }
 
-void Terminal::escape$m(const Vector<unsigned>& params)
+void Terminal::escape$m(const ParamVector& params)
 {
     if (params.size() == 3 && params[1] == 5) {
         if (params[0] == 38) {
@@ -183,25 +183,25 @@ void Terminal::escape$m(const Vector<unsigned>& params)
     }
 }
 
-void Terminal::escape$s(const Vector<unsigned>&)
+void Terminal::escape$s(const ParamVector&)
 {
     m_saved_cursor_row = m_cursor_row;
     m_saved_cursor_column = m_cursor_column;
 }
 
-void Terminal::escape$u(const Vector<unsigned>&)
+void Terminal::escape$u(const ParamVector&)
 {
     set_cursor(m_saved_cursor_row, m_saved_cursor_column);
 }
 
-void Terminal::escape$t(const Vector<unsigned>& params)
+void Terminal::escape$t(const ParamVector& params)
 {
     if (params.size() < 1)
         return;
     dbgprintf("FIXME: escape$t: Ps: %u\n", params[0]);
 }
 
-void Terminal::escape$r(const Vector<unsigned>& params)
+void Terminal::escape$r(const ParamVector& params)
 {
     unsigned top = 1;
     unsigned bottom = m_rows;
@@ -212,7 +212,7 @@ void Terminal::escape$r(const Vector<unsigned>& params)
     dbgprintf("FIXME: escape$r: Set scrolling region: %u-%u\n", top, bottom);
 }
 
-void Terminal::escape$H(const Vector<unsigned>& params)
+void Terminal::escape$H(const ParamVector& params)
 {
     unsigned row = 1;
     unsigned col = 1;
@@ -223,7 +223,7 @@ void Terminal::escape$H(const Vector<unsigned>& params)
     set_cursor(row - 1, col - 1);
 }
 
-void Terminal::escape$A(const Vector<unsigned>& params)
+void Terminal::escape$A(const ParamVector& params)
 {
     int num = 1;
     if (params.size() >= 1)
@@ -236,7 +236,7 @@ void Terminal::escape$A(const Vector<unsigned>& params)
     set_cursor(new_row, m_cursor_column);
 }
 
-void Terminal::escape$B(const Vector<unsigned>& params)
+void Terminal::escape$B(const ParamVector& params)
 {
     int num = 1;
     if (params.size() >= 1)
@@ -249,7 +249,7 @@ void Terminal::escape$B(const Vector<unsigned>& params)
     set_cursor(new_row, m_cursor_column);
 }
 
-void Terminal::escape$C(const Vector<unsigned>& params)
+void Terminal::escape$C(const ParamVector& params)
 {
     int num = 1;
     if (params.size() >= 1)
@@ -262,7 +262,7 @@ void Terminal::escape$C(const Vector<unsigned>& params)
     set_cursor(m_cursor_row, new_column);
 }
 
-void Terminal::escape$D(const Vector<unsigned>& params)
+void Terminal::escape$D(const ParamVector& params)
 {
     int num = 1;
     if (params.size() >= 1)
@@ -275,7 +275,7 @@ void Terminal::escape$D(const Vector<unsigned>& params)
     set_cursor(m_cursor_row, new_column);
 }
 
-void Terminal::escape$G(const Vector<unsigned>& params)
+void Terminal::escape$G(const ParamVector& params)
 {
     int new_column = 1;
     if (params.size() >= 1)
@@ -285,7 +285,7 @@ void Terminal::escape$G(const Vector<unsigned>& params)
     set_cursor(m_cursor_row, new_column);
 }
 
-void Terminal::escape$d(const Vector<unsigned>& params)
+void Terminal::escape$d(const ParamVector& params)
 {
     int new_row = 1;
     if (params.size() >= 1)
@@ -295,7 +295,7 @@ void Terminal::escape$d(const Vector<unsigned>& params)
     set_cursor(new_row, m_cursor_column);
 }
 
-void Terminal::escape$X(const Vector<unsigned>& params)
+void Terminal::escape$X(const ParamVector& params)
 {
     // Erase characters (without moving cursor)
     int num = 1;
@@ -309,7 +309,7 @@ void Terminal::escape$X(const Vector<unsigned>& params)
     }
 }
 
-void Terminal::escape$K(const Vector<unsigned>& params)
+void Terminal::escape$K(const ParamVector& params)
 {
     int mode = 0;
     if (params.size() >= 1)
@@ -336,7 +336,7 @@ void Terminal::escape$K(const Vector<unsigned>& params)
     }
 }
 
-void Terminal::escape$J(const Vector<unsigned>& params)
+void Terminal::escape$J(const ParamVector& params)
 {
     int mode = 0;
     if (params.size() >= 1)
@@ -370,7 +370,7 @@ void Terminal::escape$J(const Vector<unsigned>& params)
     }
 }
 
-void Terminal::escape$M(const Vector<unsigned>& params)
+void Terminal::escape$M(const ParamVector& params)
 {
     int count = 1;
     if (params.size() >= 1)
@@ -414,7 +414,7 @@ void Terminal::execute_escape_sequence(byte final)
 {
     m_final = final;
     auto paramparts = String((const char*)m_parameters.data(), m_parameters.size()).split(';');
-    Vector<unsigned> params;
+    ParamVector params;
     for (auto& parampart : paramparts) {
         bool ok;
         unsigned value = parse_uint(parampart, ok);

Applications/Terminal/Terminal.h

@@ -25,6 +25,8 @@ public:
     void apply_size_increments_to_window(GWindow&);
 
 private:
+    typedef Vector<unsigned, 4> ParamVector;
+
     virtual void event(CEvent&) override;
     virtual void paint_event(GPaintEvent&) override;
     virtual void resize_event(GResizeEvent&) override;
@@ -42,22 +44,22 @@ private:
     void unimplemented_escape();
     void unimplemented_xterm_escape();
 
-    void escape$A(const Vector<unsigned>&);
-    void escape$B(const Vector<unsigned>&);
-    void escape$C(const Vector<unsigned>&);
-    void escape$D(const Vector<unsigned>&);
-    void escape$H(const Vector<unsigned>&);
-    void escape$J(const Vector<unsigned>&);
-    void escape$K(const Vector<unsigned>&);
-    void escape$M(const Vector<unsigned>&);
-    void escape$G(const Vector<unsigned>&);
-    void escape$X(const Vector<unsigned>&);
-    void escape$d(const Vector<unsigned>&);
-    void escape$m(const Vector<unsigned>&);
-    void escape$s(const Vector<unsigned>&);
-    void escape$u(const Vector<unsigned>&);
-    void escape$t(const Vector<unsigned>&);
-    void escape$r(const Vector<unsigned>&);
+    void escape$A(const ParamVector&);
+    void escape$B(const ParamVector&);
+    void escape$C(const ParamVector&);
+    void escape$D(const ParamVector&);
+    void escape$H(const ParamVector&);
+    void escape$J(const ParamVector&);
+    void escape$K(const ParamVector&);
+    void escape$M(const ParamVector&);
+    void escape$G(const ParamVector&);
+    void escape$X(const ParamVector&);
+    void escape$d(const ParamVector&);
+    void escape$m(const ParamVector&);
+    void escape$s(const ParamVector&);
+    void escape$u(const ParamVector&);
+    void escape$t(const ParamVector&);
+    void escape$r(const ParamVector&);
 
     void clear();
 

Kernel/Process.cpp

@@ -2276,7 +2276,7 @@ void SharedBuffer::destroy_if_unused()
 void Process::disown_all_shared_buffers()
 {
     LOCKER(shared_buffers().lock());
-    Vector<SharedBuffer*> buffers_to_disown;
+    Vector<SharedBuffer*, 32> buffers_to_disown;
     for (auto& it : shared_buffers().resource())
         buffers_to_disown.append(it.value.ptr());
     for (auto* shared_buffer : buffers_to_disown)

Kernel/Thread.cpp

@@ -167,7 +167,7 @@ void Thread::finalize()
 
 void Thread::finalize_dying_threads()
 {
-    Vector<Thread*> dying_threads;
+    Vector<Thread*, 32> dying_threads;
     {
         InterruptDisabler disabler;
         for_each_in_state(Thread::State::Dying, [&] (Thread& thread) {

LibC/unistd.cpp

@@ -64,7 +64,7 @@ int execvp(const char* filename, char* const argv[])
 
 int execl(const char* filename, const char* arg0, ...)
 {
-    Vector<const char*> args;
+    Vector<const char*, 16> args;
     args.append(arg0);
 
     va_list ap;

LibCore/CEventLoop.cpp

@@ -95,7 +95,7 @@ int CEventLoop::exec()
             wait_for_event();
             do_processing();
         }
-        Vector<QueuedEvent> events = move(m_queued_events);
+        auto events = move(m_queued_events);
         for (auto& queued_event : events) {
             auto* receiver = queued_event.receiver.ptr();
             auto& event = *queued_event.event;

LibCore/CEventLoop.h

@@ -52,7 +52,7 @@ private:
         WeakPtr<CObject> receiver;
         OwnPtr<CEvent> event;
     };
-    Vector<QueuedEvent> m_queued_events;
+    Vector<QueuedEvent, 64> m_queued_events;
 
     bool m_running { false };
     bool m_exit_requested { false };

LibGUI/GEventLoop.h

@@ -60,7 +60,7 @@ private:
     void handle_wm_event(const WSAPI_ServerMessage&, GWindow&);
     void connect_to_server();
 
-    Vector<WSAPI_ServerMessage> m_unprocessed_messages;
+    Vector<WSAPI_ServerMessage, 64> m_unprocessed_messages;
     static pid_t s_server_pid;
     static pid_t s_event_fd;
 };

LibGUI/GFileSystemModel.cpp

@@ -76,7 +76,7 @@ struct GFileSystemModel::Node {
 
     String full_path(const GFileSystemModel& model) const
     {
-        Vector<String> lineage;
+        Vector<String, 32> lineage;
         for (auto* ancestor = parent; ancestor; ancestor = ancestor->parent) {
             lineage.append(ancestor->name);
         }

LibGUI/GShortcut.cpp

@@ -116,7 +116,7 @@ static String to_string(KeyCode key)
 
 String GShortcut::to_string() const
 {
-    Vector<String> parts;
+    Vector<String, 8> parts;
 
     if (m_modifiers & Mod_Ctrl)
         parts.append("Ctrl");

SharedGraphics/DisjointRectSet.cpp

@@ -14,7 +14,7 @@ void DisjointRectSet::add(const Rect& new_rect)
 
 void DisjointRectSet::shatter()
 {
-    Vector<Rect> output;
+    Vector<Rect, 32> output;
     output.ensure_capacity(m_rects.size());
     bool pass_had_intersections = false;
     do {

SharedGraphics/DisjointRectSet.h

@@ -13,11 +13,11 @@ public:
 
     void clear() { m_rects.clear(); }
     void clear_with_capacity() { m_rects.clear_with_capacity(); }
-    const Vector<Rect>& rects() const { return m_rects; }
+    const Vector<Rect, 32>& rects() const { return m_rects; }
 
 private:
     void shatter();
 
-    Vector<Rect> m_rects;
+    Vector<Rect, 32> m_rects;
 };
 

SharedGraphics/Painter.h

@@ -75,7 +75,7 @@ protected:
 
     Rect m_clip_origin;
     Retained<GraphicsBitmap> m_target;
-    Vector<State> m_state_stack;
+    Vector<State, 4> m_state_stack;
 };
 
 class PainterStateSaver {

Userland/ls.cpp

@@ -197,7 +197,7 @@ int do_dir_short(const char* path)
         return 1;
     }
 
-    Vector<String> names;
+    Vector<String, 1024> names;
     int longest_name = 0;
     while (auto* de = readdir(dirp)) {
         if (de->d_name[0] == '.' && !flag_show_dotfiles)