Change TUI window iteration

This changes the TUI to track all the instantiated windows in a new
global vector.  After this, iteration over TUI windows is done by
simply iterating over this vector.

This approach makes it simpler to define new window types.  In
particular, a subsequent patch will add the ability to define a TUI
window from Python.

Note that this series will not remove tui_win_list.  This will
continue to exist in parallel, only because it was simpler to leave
this alone.  Perhaps it could still be removed in the future.

gdb/ChangeLog
2020-02-22  Tom Tromey  <tom@tromey.com>

	* tui/tui-winsource.h (struct tui_source_window_iterator)
	<inner_iterator>: New etytypedef.
	<tui_source_window_iterator>: Take "end" parameter.
	<tui_source_window_iterator>: Take iterator.
	<operator*, advance>: Update.
	<m_iter>: Change type.
	<m_end>: New field.
	(struct tui_source_windows) <begin, end>: Update.
	* tui/tui-layout.c (tui_windows): New global.
	(tui_apply_current_layout): Clear tui_windows.
	(tui_layout_window::apply): Update tui_windows.
	* tui/tui-data.h (tui_windows): Declare.
	(all_tui_windows): Now inline function.
	(class tui_window_iterator, struct all_tui_windows): Remove.

Change-Id: I6ab77976d6326f427178f725434f8f82046e0bbf

1 files changed, 8 insertions, 66 deletions

diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index e15ac58..a460137 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -238,74 +238,16 @@ extern struct tui_win_info *tui_win_list[MAX_MAJOR_WINDOWS];
 #define TUI_DATA_WIN    ((tui_data_window *) tui_win_list[DATA_WIN])
 #define TUI_CMD_WIN     ((tui_cmd_window *) tui_win_list[CMD_WIN])
 
-/* An iterator that iterates over all windows.  */
+/* All the windows that are currently instantiated, in layout
+   order.  */
+extern std::vector<tui_win_info *> tui_windows;
 
-class tui_window_iterator
+/* Return a range adapter for iterating over TUI windows.  */
+static inline std::vector<tui_win_info *> &
+all_tui_windows ()
 {
-public:
-
-  typedef tui_window_iterator self_type;
-  typedef struct tui_win_info *value_type;
-  typedef struct tui_win_info *&reference;
-  typedef struct tui_win_info **pointer;
-  typedef std::forward_iterator_tag iterator_category;
-  typedef int difference_type;
-
-  explicit tui_window_iterator (enum tui_win_type type)
-    : m_type (type)
-  {
-    advance ();
-  }
-
-  tui_window_iterator ()
-    : m_type (MAX_MAJOR_WINDOWS)
-  {
-  }
-
-  bool operator!= (const self_type &other) const
-  {
-    return m_type != other.m_type;
-  }
-
-  value_type operator* () const
-  {
-    gdb_assert (m_type < MAX_MAJOR_WINDOWS);
-    return tui_win_list[m_type];
-  }
-
-  self_type &operator++ ()
-  {
-    ++m_type;
-    advance ();
-    return *this;
-  }
-
-private:
-
-  void advance ()
-  {
-    while (m_type < MAX_MAJOR_WINDOWS && tui_win_list[m_type] == nullptr)
-      ++m_type;
-  }
-
-  int m_type;
-};
-
-/* A range adapter for iterating over TUI windows.  */
-
-struct all_tui_windows
-{
-  tui_window_iterator begin () const
-  {
-    return tui_window_iterator (SRC_WIN);
-  }
-
-  tui_window_iterator end () const
-  {
-    return tui_window_iterator ();
-  }
-};
-
+  return tui_windows;
+}
 
 /* Data Manipulation Functions.  */
 extern int tui_term_height (void);