More type safety for TUI source window functions

A few functions can only operate on a source or disassembly window.
This patch adds a bit more type safety to a few of these functions.
This simplifies a subsequent patch.

gdb/ChangeLog
2019-06-25  Tom Tromey  <tom@tromey.com>

	* tui/tui-winsource.h (tui_clear_source_content)
	(tui_erase_source_content, tui_show_source_content): Change type
	of win_info.
	* tui/tui-winsource.c (tui_clear_source_content)
	(tui_erase_source_content, tui_show_source_content): Change type
	of win_info.
	* tui/tui-win.c (tui_resize_all, tui_adjust_win_heights): Update.
	* tui/tui-source.h (tui_set_source_content_nil): Change type of
	win_info.
	* tui/tui-source.c (tui_set_source_content_nil): Change type of
	win_info.
	* tui/tui-layout.c (show_source_or_disasm_and_command): Update.

7 files changed, 48 insertions, 24 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 02d96d1..ee4b3d0 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,20 @@
 2019-06-25  Tom Tromey  <tom@tromey.com>
 
+	* tui/tui-winsource.h (tui_clear_source_content)
+	(tui_erase_source_content, tui_show_source_content): Change type
+	of win_info.
+	* tui/tui-winsource.c (tui_clear_source_content)
+	(tui_erase_source_content, tui_show_source_content): Change type
+	of win_info.
+	* tui/tui-win.c (tui_resize_all, tui_adjust_win_heights): Update.
+	* tui/tui-source.h (tui_set_source_content_nil): Change type of
+	win_info.
+	* tui/tui-source.c (tui_set_source_content_nil): Change type of
+	win_info.
+	* tui/tui-layout.c (show_source_or_disasm_and_command): Update.
+
+2019-06-25  Tom Tromey  <tom@tromey.com>
+
 	* tui/tui-winsource.c (tui_clear_source_content)
 	(tui_source_window_base::set_is_exec_point_at): Update.
 	* tui/tui-source.c (tui_set_source_content_nil): Update.
diff --git a/gdb/tui/tui-layout.c b/gdb/tui/tui-layout.c
index 9fffba7..ad99ec9 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -921,7 +921,7 @@ show_source_or_disasm_and_command (enum tui_layout_type layout_type)
       base->m_has_locator = true;
       tui_make_visible (locator);
       tui_show_locator_content ();
-      tui_show_source_content (*win_info_ptr);
+      tui_show_source_content (base);
 
       if (TUI_CMD_WIN == NULL)
 	{
diff --git a/gdb/tui/tui-source.c b/gdb/tui/tui-source.c
index 54e4e1b..fd89d98 100644
--- a/gdb/tui/tui-source.c
+++ b/gdb/tui/tui-source.c
@@ -222,7 +222,7 @@ tui_set_source_content (struct symtab *s,
    source files cannot be accessed.  */
 
 void
-tui_set_source_content_nil (struct tui_win_info *win_info, 
+tui_set_source_content_nil (struct tui_source_window_base *win_info,
 			    const char *warning_string)
 {
   int line_width;
diff --git a/gdb/tui/tui-source.h b/gdb/tui/tui-source.h
index 7757373..9e1dc1a 100644
--- a/gdb/tui/tui-source.h
+++ b/gdb/tui/tui-source.h
@@ -27,7 +27,7 @@
 struct symtab;
 struct tui_win_info;
 
-extern void tui_set_source_content_nil (struct tui_win_info *, 
+extern void tui_set_source_content_nil (struct tui_source_window_base *,
 					const char *);
 
 extern enum tui_status tui_set_source_content (struct symtab *, 
diff --git a/gdb/tui/tui-win.c b/gdb/tui/tui-win.c
index dac3996..2f862c1 100644
--- a/gdb/tui/tui-win.c
+++ b/gdb/tui/tui-win.c
@@ -556,6 +556,7 @@ tui_resize_all (void)
       struct tui_win_info *win_with_focus = tui_win_with_focus ();
       struct tui_win_info *first_win;
       struct tui_win_info *second_win;
+      tui_source_window_base *src_win;
       struct tui_locator_window *locator = tui_locator_win_info_ptr ();
       int win_type;
       int new_height, split_diff, cmd_split_diff, num_wins_displayed = 2;
@@ -592,7 +593,8 @@ tui_resize_all (void)
        {
 	case SRC_COMMAND:
 	case DISASSEM_COMMAND:
-	  first_win = tui_source_windows ()[0];
+	  src_win = tui_source_windows ()[0];
+	  first_win = src_win;
 	  first_win->width += width_diff;
 	  locator->width += width_diff;
 	  /* Check for invalid heights.  */
@@ -614,13 +616,14 @@ tui_resize_all (void)
 	  make_invisible_and_set_new_height (TUI_CMD_WIN, new_height);
 	  first_win->make_visible_with_new_height ();
 	  TUI_CMD_WIN->make_visible_with_new_height ();
-	  if (first_win->content_size <= 0)
-	    tui_erase_source_content (first_win, EMPTY_SOURCE_PROMPT);
+	  if (src_win->content_size <= 0)
+	    tui_erase_source_content (src_win, EMPTY_SOURCE_PROMPT);
 	  break;
 	default:
 	  if (cur_layout == SRC_DISASSEM_COMMAND)
 	    {
-	      first_win = TUI_SRC_WIN;
+	      src_win = TUI_SRC_WIN;
+	      first_win = src_win;
 	      first_win->width += width_diff;
 	      second_win = TUI_DISASM_WIN;
 	      second_win->width += width_diff;
@@ -629,7 +632,8 @@ tui_resize_all (void)
 	    {
 	      first_win = TUI_DATA_WIN;
 	      first_win->width += width_diff;
-	      second_win = tui_source_windows ()[0];
+	      src_win = tui_source_windows ()[0];
+	      second_win = src_win;
 	      second_win->width += width_diff;
 	    }
 	  /* Change the first window's height/width.  */
@@ -677,10 +681,8 @@ tui_resize_all (void)
 	  first_win->make_visible_with_new_height ();
 	  second_win->make_visible_with_new_height ();
 	  TUI_CMD_WIN->make_visible_with_new_height ();
-	  if (first_win->content_size <= 0)
-	    tui_erase_source_content (first_win, EMPTY_SOURCE_PROMPT);
-	  if (second_win->content_size <= 0)
-	    tui_erase_source_content (second_win, EMPTY_SOURCE_PROMPT);
+	  if (src_win->content_size <= 0)
+	    tui_erase_source_content (src_win, EMPTY_SOURCE_PROMPT);
 	  break;
 	}
       /* Now remove all invisible windows, and their content so that
@@ -1124,21 +1126,28 @@ tui_adjust_win_heights (struct tui_win_info *primary_win_info,
 	      TUI_CMD_WIN->origin.y = locator->origin.y + 1;
 	      win_info->make_visible_with_new_height ();
 	      primary_win_info->make_visible_with_new_height ();
-	      if (src_win_info->content_size <= 0)
-		tui_erase_source_content (src_win_info, EMPTY_SOURCE_PROMPT);
+	      if ((src_win_info->type == SRC_WIN
+		   || src_win_info->type == DISASSEM_WIN)
+		  && src_win_info->content_size <= 0)
+		tui_erase_source_content
+		  ((tui_source_window_base *) src_win_info,
+		   EMPTY_SOURCE_PROMPT);
 	    }
 	  else
 	    {
 	      struct tui_win_info *first_win;
-	      struct tui_win_info *second_win;
+	      struct tui_source_window_base *second_win;
+	      tui_source_window_base *src1;
 
 	      if (cur_layout == SRC_DISASSEM_COMMAND)
 		{
-		  first_win = TUI_SRC_WIN;
+		  src1 = TUI_SRC_WIN;
+		  first_win = src1;
 		  second_win = TUI_DISASM_WIN;
 		}
 	      else
 		{
+		  src1 = nullptr;
 		  first_win = TUI_DATA_WIN;
 		  second_win = tui_source_windows ()[0];
 		}
@@ -1227,8 +1236,8 @@ tui_adjust_win_heights (struct tui_win_info *primary_win_info,
 	      TUI_CMD_WIN->make_visible_with_new_height ();
 	      second_win->make_visible_with_new_height ();
 	      first_win->make_visible_with_new_height ();
-	      if (first_win->content_size <= 0)
-		tui_erase_source_content (first_win, EMPTY_SOURCE_PROMPT);
+	      if (src1 != nullptr && src1->content_size <= 0)
+		tui_erase_source_content (src1, EMPTY_SOURCE_PROMPT);
 	      if (second_win->content_size <= 0)
 		tui_erase_source_content (second_win, EMPTY_SOURCE_PROMPT);
 	    }
diff --git a/gdb/tui/tui-winsource.c b/gdb/tui/tui-winsource.c
index f30c3d6..b11feff 100644
--- a/gdb/tui/tui-winsource.c
+++ b/gdb/tui/tui-winsource.c
@@ -204,7 +204,7 @@ tui_update_source_windows_with_line (struct symtab *s, int line)
 }
 
 void
-tui_clear_source_content (struct tui_win_info *win_info, 
+tui_clear_source_content (struct tui_source_window_base *win_info,
 			  int display_prompt)
 {
   if (win_info != NULL)
@@ -225,7 +225,7 @@ tui_clear_source_content (struct tui_win_info *win_info,
 
 
 void
-tui_erase_source_content (struct tui_win_info *win_info, 
+tui_erase_source_content (struct tui_source_window_base *win_info,
 			  int display_prompt)
 {
   int x_pos;
@@ -291,7 +291,7 @@ tui_show_source_line (struct tui_win_info *win_info, int lineno)
 }
 
 void
-tui_show_source_content (struct tui_win_info *win_info)
+tui_show_source_content (struct tui_source_window_base *win_info)
 {
   if (win_info->content_size > 0)
     {
diff --git a/gdb/tui/tui-winsource.h b/gdb/tui/tui-winsource.h
index 09a9d5a..f914c0a 100644
--- a/gdb/tui/tui-winsource.h
+++ b/gdb/tui/tui-winsource.h
@@ -50,9 +50,9 @@ extern void tui_update_source_window_as_is (struct tui_source_window_base *,
 extern void tui_update_source_windows_with_addr (struct gdbarch *, CORE_ADDR);
 extern void tui_update_source_windows_with_line (struct symtab *, 
 						 int);
-extern void tui_clear_source_content (struct tui_win_info *, int);
-extern void tui_erase_source_content (struct tui_win_info *, int);
-extern void tui_show_source_content (struct tui_win_info *);
+extern void tui_clear_source_content (struct tui_source_window_base *, int);
+extern void tui_erase_source_content (struct tui_source_window_base *, int);
+extern void tui_show_source_content (struct tui_source_window_base *);
 extern void tui_set_exec_info_content (struct tui_source_window_base *);
 extern void tui_show_exec_info_content (struct tui_source_window_base *);
 extern void tui_erase_exec_info_content (struct tui_source_window_base *);