Make type-safe the 'content' field of struct tui_gen_win_info

The 'content' field of struct tui_gen_win_info currently has type
void ** but the field always stores an object of type tui_win_content.
Instead of unnecessarily casting to and from void ** we should just give
the field the type tui_win_content in the first place.

This patch does this and also eliminates all now-redundant casts
involving the 'content' struct field that I could find.

gdb/ChangeLog:

	* tui/tui-data.h (struct tui_win_element): Forward-declare.
	(tui_win_content): Move declaration.
	(struct tui_gen_win_info): Give 'content' field the
	type tui_win_content.
	* tui/tui-data.c (init_content_element): Remove redundant and
	erroneous casts.
	(tui_add_content_elements): Remove erroneous cast.
	* tui/tui-disasm.c (tui_set_disassem_content): Remove redundant
	casts.
	(tui_get_begin_asm_address): Likewise.
	* tui/tui-regs.c (tui_show_registers): Likewise.
	(tui_show_register_group): Likewise.
	(tui_display_registers_from): Likewise.
	(tui_check_register_values): Likewise.
	* tui/tui-source.c (tui_set_source_content): Likewise.
	(tui_set_source_content_nil): Likewise.
	(tui_source_is_displayed): Likewise.
	* tui/tui-stack.c (tui_show_locator_content): Likewise.
	(tui_set_locator_fullname): Likewise.
	(tui_set_locator_info): Likewise.
	(tui_show_frame_info): Likewise.
	* tui/tui-winsource.c (tui_clear_source_content): Likewise.
	(tui_show_source_line): Likewise.
	(tui_horizontal_source_scroll): Likewise.
	(tui_update_breakpoint_info): Likewise.
	(tui_set_exec_info_content): Likewise.
	(tui_show_exec_info_content): Likewise.
	(tui_alloc_source_buffer): Likewise.
	(tui_line_is_displayed): Likewise.
	(tui_addr_is_displayed): Likewise.

8 files changed, 94 insertions, 85 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index f21b358..44af045 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,36 @@
+2015-04-28  Patrick Palka  <patrick@parcs.ath.cx>
+
+	* tui/tui-data.h (struct tui_win_element): Forward-declare.
+	(tui_win_content): Move declaration.
+	(struct tui_gen_win_info): Give 'content' field the
+	type tui_win_content.
+	* tui/tui-data.c (init_content_element): Remove redundant and
+	erroneous casts.
+	(tui_add_content_elements): Remove erroneous cast.
+	* tui/tui-disasm.c (tui_set_disassem_content): Remove redundant
+	casts.
+	(tui_get_begin_asm_address): Likewise.
+	* tui/tui-regs.c (tui_show_registers): Likewise.
+	(tui_show_register_group): Likewise.
+	(tui_display_registers_from): Likewise.
+	(tui_check_register_values): Likewise.
+	* tui/tui-source.c (tui_set_source_content): Likewise.
+	(tui_set_source_content_nil): Likewise.
+	(tui_source_is_displayed): Likewise.
+	* tui/tui-stack.c (tui_show_locator_content): Likewise.
+	(tui_set_locator_fullname): Likewise.
+	(tui_set_locator_info): Likewise.
+	(tui_show_frame_info): Likewise.
+	* tui/tui-winsource.c (tui_clear_source_content): Likewise.
+	(tui_show_source_line): Likewise.
+	(tui_horizontal_source_scroll): Likewise.
+	(tui_update_breakpoint_info): Likewise.
+	(tui_set_exec_info_content): Likewise.
+	(tui_show_exec_info_content): Likewise.
+	(tui_alloc_source_buffer): Likewise.
+	(tui_line_is_displayed): Likewise.
+	(tui_addr_is_displayed): Likewise.
+
 2015-04-27  John Baldwin  <jhb@FreeBSD.org>
 
 	* fbsd-nat.c: (fbsd_wait) [PL_FLAG_EXEC]: Report TARGET_WAITKIND_EXECD
diff --git a/gdb/tui/tui-data.c b/gdb/tui/tui-data.c
index 43bcec2..44c1feb 100644
--- a/gdb/tui/tui-data.c
+++ b/gdb/tui/tui-data.c
@@ -490,11 +490,9 @@ init_content_element (struct tui_win_element *element,
     case DATA_WIN:
       tui_init_generic_part (&element->which_element.data_window);
       element->which_element.data_window.type = DATA_ITEM_WIN;
-      ((struct tui_gen_win_info *)
-       &element->which_element.data_window)->content =
-	(void **) tui_alloc_content (1, DATA_ITEM_WIN);
-      ((struct tui_gen_win_info *)
-       & element->which_element.data_window)->content_size = 1;
+      element->which_element.data_window.content =
+	tui_alloc_content (1, DATA_ITEM_WIN);
+      element->which_element.data_window.content_size = 1;
       break;
     case CMD_WIN:
       element->which_element.command.line = (char *) NULL;
@@ -635,8 +633,7 @@ tui_add_content_elements (struct tui_gen_win_info *win_info,
 
   if (win_info->content == NULL)
     {
-      win_info->content = (void **) tui_alloc_content (num_elements,
-						       win_info->type);
+      win_info->content = tui_alloc_content (num_elements, win_info->type);
       index_start = 0;
     }
   else
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index f87c45d..7651efd 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -31,6 +31,11 @@ struct tui_point
   int x, y;
 };
 
+struct tui_win_element;
+
+/* This describes the content of the window.  */
+typedef struct tui_win_element **tui_win_content;
+
 /* Generic window information.  */
 struct tui_gen_win_info
 {
@@ -39,7 +44,7 @@ struct tui_gen_win_info
   int width;		    /* Window width.  */
   int height;		    /* Window height.  */
   struct tui_point origin;  /* Origin of window.  */
-  void **content;	    /* Content of window.  */
+  tui_win_content content;  /* Content of window.  */
   int content_size;	    /* Size of content (# of elements).  */
   int content_in_use;	    /* Can it be used, or is it already used?  */
   int viewport_height;	    /* Viewport height.  */
@@ -250,11 +255,6 @@ struct tui_win_element
   union tui_which_element which_element;
 };
 
-
-/* This describes the content of the window.  */
-typedef struct tui_win_element **tui_win_content;
-
-
 /* This struct defines the specific information about a data display
    window.  */
 struct tui_data_info
diff --git a/gdb/tui/tui-disasm.c b/gdb/tui/tui-disasm.c
index 821a4f1..f86c216 100644
--- a/gdb/tui/tui-disasm.c
+++ b/gdb/tui/tui-disasm.c
@@ -192,8 +192,7 @@ tui_set_disassem_content (struct gdbarch *gdbarch, CORE_ADDR pc)
   TUI_DISASM_WIN->detail.source_info.gdbarch = gdbarch;
   TUI_DISASM_WIN->detail.source_info.start_line_or_addr.loa = LOA_ADDRESS;
   TUI_DISASM_WIN->detail.source_info.start_line_or_addr.u.addr = pc;
-  cur_pc = (CORE_ADDR) (((struct tui_win_element *)
-			 locator->content[0])->which_element.locator.addr);
+  cur_pc = locator->content[0]->which_element.locator.addr;
 
   max_lines = TUI_DISASM_WIN->generic.height - 2;	/* Account for
 							   hilite.  */
@@ -232,7 +231,7 @@ tui_set_disassem_content (struct gdbarch *gdbarch, CORE_ADDR pc)
       struct tui_source_element *src;
       int cur_len;
 
-      element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i];
+      element = TUI_DISASM_WIN->generic.content[i];
       src = &element->which_element.source;
       strcpy (line, asm_lines[i].addr_string);
       cur_len = strlen (line);
@@ -334,8 +333,7 @@ tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
   CORE_ADDR addr;
 
   locator = tui_locator_win_info_ptr ();
-  element = &((struct tui_win_element *)
-	      locator->content[0])->which_element.locator;
+  element = &locator->content[0]->which_element.locator;
 
   if (element->addr == 0)
     {
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index feb11ba..61918f8 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -171,7 +171,7 @@ tui_show_registers (struct reggroup *group)
 
 	  data_item_win = &display_info->regs_content[i]
             ->which_element.data_window;
-          win = (struct tui_win_element *) data_item_win->content[0];
+          win = data_item_win->content[0];
           win->which_element.data.highlight = FALSE;
 	}
       display_info->current_group = group;
@@ -274,8 +274,7 @@ tui_show_register_group (struct reggroup *group,
 
 	  data_item_win =
             &display_info->regs_content[pos]->which_element.data_window;
-          data = &((struct tui_win_element *)
-		   data_item_win->content[0])->which_element.data;
+          data = &data_item_win->content[0]->which_element.data;
           if (data)
             {
               if (!refresh_values_only)
@@ -322,8 +321,7 @@ tui_display_registers_from (int start_element_no)
 
           data_item_win
 	    = &display_info->regs_content[i]->which_element.data_window;
-          data = &((struct tui_win_element *)
-                   data_item_win->content[0])->which_element.data;
+          data = &data_item_win->content[0]->which_element.data;
           len = 0;
           p = data->content;
           if (p != 0)
@@ -365,8 +363,7 @@ tui_display_registers_from (int start_element_no)
 	      /* Create the window if necessary.  */
 	      data_item_win = &display_info->regs_content[i]
                 ->which_element.data_window;
-	      data_element_ptr = &((struct tui_win_element *)
-				   data_item_win->content[0])->which_element.data;
+	      data_element_ptr = &data_item_win->content[0]->which_element.data;
               if (data_item_win->handle != (WINDOW*) NULL
                   && (data_item_win->height != 1
                       || data_item_win->width != item_win_width
@@ -508,8 +505,7 @@ tui_check_register_values (struct frame_info *frame)
 
 	      data_item_win_ptr = &display_info->regs_content[i]->
                 which_element.data_window;
-	      data = &((struct tui_win_element *)
-                       data_item_win_ptr->content[0])->which_element.data;
+	      data = &data_item_win_ptr->content[0]->which_element.data;
 	      was_hilighted = data->highlight;
 
               tui_get_register (frame, data,
diff --git a/gdb/tui/tui-source.c b/gdb/tui/tui-source.c
index 4070894..31df0c8 100644
--- a/gdb/tui/tui-source.c
+++ b/gdb/tui/tui-source.c
@@ -120,16 +120,14 @@ tui_set_source_content (struct symtab *s,
 		  while (cur_line < nlines)
 		    {
 		      struct tui_win_element *element
-			= (struct tui_win_element *)
-			TUI_SRC_WIN->generic.content[cur_line];
+			= TUI_SRC_WIN->generic.content[cur_line];
 
 		      /* Get the first character in the line.  */
 		      c = fgetc (stream);
 
 		      if (offset == 0)
-			src_line = ((struct tui_win_element *)
-				   TUI_SRC_WIN->generic.content[
-					cur_line])->which_element.source.line;
+			src_line = TUI_SRC_WIN->generic.content[cur_line]
+				     ->which_element.source.line;
 		      /* Init the line with the line number.  */
 		      sprintf (src_line, "%-6d", cur_line_no);
 		      cur_len = strlen (src_line);
@@ -150,11 +148,12 @@ tui_set_source_content (struct symtab *s,
 		      element->which_element.source.line_or_addr.u.line_no =
 			cur_line_no;
 		      element->which_element.source.is_exec_point =
-			(filename_cmp (((struct tui_win_element *)
-				       locator->content[0])->which_element.locator.full_name,
+			(filename_cmp (locator->content[0]
+				         ->which_element.locator.full_name,
 				       symtab_to_fullname (s)) == 0
-			 && cur_line_no == ((struct tui_win_element *)
-					    locator->content[0])->which_element.locator.line_no);
+				         && cur_line_no
+					      == locator->content[0]
+						   ->which_element.locator.line_no);
 		      if (c != EOF)
 			{
 			  i = strlen (src_line) - 1;
@@ -220,13 +219,12 @@ tui_set_source_content (struct symtab *s,
 		      /* Now copy the line taking the offset into
 			 account.  */
 		      if (strlen (src_line) > offset)
-			strcpy (((struct tui_win_element *)
-				 TUI_SRC_WIN->generic.content[cur_line])->which_element.source.line,
+			strcpy (TUI_SRC_WIN->generic.content[cur_line]
+				  ->which_element.source.line,
 				&src_line[offset]);
 		      else
-			((struct tui_win_element *)
-			 TUI_SRC_WIN->generic.content[
-			  cur_line])->which_element.source.line[0] = (char) 0;
+			TUI_SRC_WIN->generic.content[cur_line]
+			  ->which_element.source.line[0] = (char) 0;
 		      cur_line++;
 		      cur_line_no++;
 		    }
@@ -268,8 +266,7 @@ tui_set_source_content_nil (struct tui_win_info *win_info,
          i.e. the line number is 0, there is no bp, it is not where
          the program is stopped.  */
 
-      struct tui_win_element *element =
-	(struct tui_win_element *) win_info->generic.content[curr_line];
+      struct tui_win_element *element = win_info->generic.content[curr_line];
 
       element->which_element.source.line_or_addr.loa = LOA_LINE;
       element->which_element.source.line_or_addr.u.line_no = 0;
@@ -337,9 +334,8 @@ tui_source_is_displayed (const char *fullname)
 {
   return (TUI_SRC_WIN != NULL
 	  && TUI_SRC_WIN->generic.content_in_use 
-	  && (filename_cmp (((struct tui_win_element *)
-			     (tui_locator_win_info_ptr ())->
-			     content[0])->which_element.locator.full_name,
+	  && (filename_cmp (tui_locator_win_info_ptr ()->content[0]
+			      ->which_element.locator.full_name,
 			    fullname) == 0));
 }
 
diff --git a/gdb/tui/tui-stack.c b/gdb/tui/tui-stack.c
index 13dd0b2..2870d70 100644
--- a/gdb/tui/tui-stack.c
+++ b/gdb/tui/tui-stack.c
@@ -253,7 +253,7 @@ tui_show_locator_content (void)
     {
       struct tui_win_element *element;
 
-      element = (struct tui_win_element *) locator->content[0];
+      element = locator->content[0];
 
       string = tui_make_status_line (&element->which_element.locator);
       wmove (locator->handle, 0, 0);
@@ -287,8 +287,7 @@ tui_set_locator_fullname (const char *fullname)
       return;
     }
 
-  element = &((struct tui_win_element *)
-	      locator->content[0])->which_element.locator;
+  element = &locator->content[0]->which_element.locator;
   element->full_name[0] = 0;
   strcat_to_buf (element->full_name, MAX_LOCATOR_ELEMENT_LEN, fullname);
 }
@@ -307,12 +306,11 @@ tui_set_locator_info (struct gdbarch *gdbarch,
   /* Allocate the locator content if necessary.  */
   if (locator->content_size <= 0)
     {
-      locator->content = (void **) tui_alloc_content (1, locator->type);
+      locator->content = tui_alloc_content (1, locator->type);
       locator->content_size = 1;
     }
 
-  element = &((struct tui_win_element *)
-	      locator->content[0])->which_element.locator;
+  element = &locator->content[0]->which_element.locator;
   element->proc_name[0] = (char) 0;
   strcat_to_buf (element->proc_name, MAX_LOCATOR_ELEMENT_LEN, procname);
   element->line_no = lineno;
@@ -369,8 +367,7 @@ tui_show_frame_info (struct frame_info *fi)
 
 	  win_info = (tui_source_windows ())->list[i];
 
-	  item = &((struct tui_win_element *)
-		   locator->content[0])->which_element;
+	  item = &locator->content[0]->which_element;
 	  if (win_info == TUI_SRC_WIN)
 	    {
 	      start_line = (item->locator.line_no -
diff --git a/gdb/tui/tui-winsource.c b/gdb/tui/tui-winsource.c
index 68eb4cf..63e0770 100644
--- a/gdb/tui/tui-winsource.c
+++ b/gdb/tui/tui-winsource.c
@@ -219,8 +219,7 @@ tui_clear_source_content (struct tui_win_info *win_info,
       tui_erase_source_content (win_info, display_prompt);
       for (i = 0; i < win_info->generic.content_size; i++)
 	{
-	  struct tui_win_element *element =
-	    (struct tui_win_element *) win_info->generic.content[i];
+	  struct tui_win_element *element = win_info->generic.content[i];
 
 	  element->which_element.source.has_break = FALSE;
 	  element->which_element.source.is_exec_point = FALSE;
@@ -276,7 +275,7 @@ tui_show_source_line (struct tui_win_info *win_info, int lineno)
   struct tui_win_element *line;
   int x, y;
 
-  line = (struct tui_win_element *) win_info->generic.content[lineno - 1];
+  line = win_info->generic.content[lineno - 1];
   if (line->which_element.source.is_exec_point)
     wattron (win_info->generic.handle, A_STANDOUT);
 
@@ -348,8 +347,8 @@ tui_horizontal_source_scroll (struct tui_win_info *win_info,
 	}
       win_info->detail.source_info.horizontal_offset = offset;
       tui_update_source_window_as_is (win_info, gdbarch, s,
-				      ((struct tui_win_element *)
-				       win_info->generic.content[0])->which_element.source.line_or_addr,
+				      win_info->generic.content[0]
+					->which_element.source.line_or_addr,
 				      FALSE);
     }
 
@@ -438,8 +437,7 @@ tui_update_breakpoint_info (struct tui_win_info *win,
       int mode;
       struct tui_source_element *line;
 
-      line = &((struct tui_win_element *)
-	       win->generic.content[i])->which_element.source;
+      line = &win->generic.content[i]->which_element.source;
       if (current_only && !line->is_exec_point)
          continue;
 
@@ -507,8 +505,7 @@ tui_set_exec_info_content (struct tui_win_info *win_info)
 
       if (exec_info_ptr->content == NULL)
 	exec_info_ptr->content =
-	  (void **) tui_alloc_content (win_info->generic.height,
-					 exec_info_ptr->type);
+	  tui_alloc_content (win_info->generic.height, exec_info_ptr->type);
       if (exec_info_ptr->content != NULL)
 	{
 	  int i;
@@ -520,9 +517,8 @@ tui_set_exec_info_content (struct tui_win_info *win_info)
 	      struct tui_win_element *src_element;
               int mode;
 
-	      element = (struct tui_win_element *) exec_info_ptr->content[i];
-	      src_element = (struct tui_win_element *)
-		win_info->generic.content[i];
+	      element = exec_info_ptr->content[i];
+	      src_element = win_info->generic.content[i];
 
               memset(element->which_element.simple_string, ' ',
                      sizeof(element->which_element.simple_string));
@@ -569,8 +565,7 @@ tui_show_exec_info_content (struct tui_win_info *win_info)
     mvwaddstr (exec_info->handle,
 	       cur_line,
 	       0,
-	       ((struct tui_win_element *)
-		exec_info->content[cur_line - 1])->which_element.simple_string);
+	       exec_info->content[cur_line - 1]->which_element.simple_string);
   tui_refresh_win (exec_info);
   exec_info->content_in_use = TRUE;
 }
@@ -628,8 +623,8 @@ tui_alloc_source_buffer (struct tui_win_info *win_info)
 	  return TUI_FAILURE;
 	}
       /* Allocate the content list.  */
-      if ((win_info->generic.content =
-	   (void **) tui_alloc_content (max_lines, SRC_WIN)) == NULL)
+      win_info->generic.content = tui_alloc_content (max_lines, SRC_WIN);
+      if (win_info->generic.content == NULL)
 	{
 	  xfree (src_line_buf);
 	  fputs_unfiltered ("Unable to Allocate Memory for "
@@ -638,9 +633,8 @@ tui_alloc_source_buffer (struct tui_win_info *win_info)
 	  return TUI_FAILURE;
 	}
       for (i = 0; i < max_lines; i++)
-	((struct tui_win_element *)
-	 win_info->generic.content[i])->which_element.source.line =
-	  src_line_buf + (line_width * i);
+	win_info->generic.content[i]->which_element.source.line
+	  = src_line_buf + (line_width * i);
     }
 
   return TUI_SUCCESS;
@@ -665,12 +659,11 @@ tui_line_is_displayed (int line,
   while (i < win_info->generic.content_size - threshold
 	 && !is_displayed)
     {
-      is_displayed = (((struct tui_win_element *)
-		       win_info->generic.content[i])->which_element.source.line_or_addr.loa
-		      == LOA_LINE)
-	&& (((struct tui_win_element *)
-	     win_info->generic.content[i])->which_element.source.line_or_addr.u.line_no
-	    == (int) line);
+      is_displayed
+	= win_info->generic.content[i]
+	    ->which_element.source.line_or_addr.loa == LOA_LINE
+	  && win_info->generic.content[i]
+	       ->which_element.source.line_or_addr.u.line_no == (int) line;
       i++;
     }
 
@@ -696,12 +689,11 @@ tui_addr_is_displayed (CORE_ADDR addr,
   while (i < win_info->generic.content_size - threshold
 	 && !is_displayed)
     {
-      is_displayed = (((struct tui_win_element *)
-		       win_info->generic.content[i])->which_element.source.line_or_addr.loa
-		      == LOA_ADDRESS)
-	&& (((struct tui_win_element *)
-	     win_info->generic.content[i])->which_element.source.line_or_addr.u.addr
-	    == addr);
+      is_displayed
+	= win_info->generic.content[i]
+	    ->which_element.source.line_or_addr.loa == LOA_ADDRESS
+	  && win_info->generic.content[i]
+	       ->which_element.source.line_or_addr.u.addr == addr;
       i++;
     }