Separate out locator window

This introduces a new subclass of tui_gen_win_info for the locator,
letting us remove another element from union tui_which_element.

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

	* tui/tui-wingeneral.c (tui_refresh_all): Update.
	* tui/tui-win.c (tui_resize_all, tui_adjust_win_heights)
	(tui_source_window_base::set_new_height): Update.
	* tui/tui-stack.c (tui_make_status_line): Change parameter type.
	Update.
	(tui_set_locator_fullname, tui_set_locator_info)
	(tui_show_frame_info): Update.
	* tui/tui-source.c (tui_set_source_content)
	(tui_source_is_displayed): Update.
	* tui/tui-layout.c (show_source_disasm_command, show_data)
	(show_source_or_disasm_and_command): Update.
	* tui/tui-disasm.c (tui_set_disassem_content)
	(tui_get_begin_asm_address): Update.
	* tui/tui-data.h (struct tui_locator_element): Remove.
	(union tui_which_element) <locator>: Remove.
	(struct tui_locator_window): New.
	(tui_locator_win_info_ptr): Change return type.
	* tui/tui-data.c (_locator): Change type.
	(tui_locator_win_info_ptr): Change return type.
	(init_content_element): Remove LOCATOR_WIN case.  Add assert.
	(tui_alloc_content): Add assert.

9 files changed, 107 insertions, 113 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 51fd84f..dd31fb6 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,29 @@
 2019-06-25  Tom Tromey  <tom@tromey.com>
 
+	* tui/tui-wingeneral.c (tui_refresh_all): Update.
+	* tui/tui-win.c (tui_resize_all, tui_adjust_win_heights)
+	(tui_source_window_base::set_new_height): Update.
+	* tui/tui-stack.c (tui_make_status_line): Change parameter type.
+	Update.
+	(tui_set_locator_fullname, tui_set_locator_info)
+	(tui_show_frame_info): Update.
+	* tui/tui-source.c (tui_set_source_content)
+	(tui_source_is_displayed): Update.
+	* tui/tui-layout.c (show_source_disasm_command, show_data)
+	(show_source_or_disasm_and_command): Update.
+	* tui/tui-disasm.c (tui_set_disassem_content)
+	(tui_get_begin_asm_address): Update.
+	* tui/tui-data.h (struct tui_locator_element): Remove.
+	(union tui_which_element) <locator>: Remove.
+	(struct tui_locator_window): New.
+	(tui_locator_win_info_ptr): Change return type.
+	* tui/tui-data.c (_locator): Change type.
+	(tui_locator_win_info_ptr): Change return type.
+	(init_content_element): Remove LOCATOR_WIN case.  Add assert.
+	(tui_alloc_content): Add assert.
+
+2019-06-25  Tom Tromey  <tom@tromey.com>
+
 	* tui/tui-winsource.c
 	(tui_exec_info_window::maybe_allocate_content): New method.
 	(tui_set_exec_info_content, tui_show_exec_info_content): Update.
diff --git a/gdb/tui/tui-data.c b/gdb/tui/tui-data.c
index 119d249..3da269b 100644
--- a/gdb/tui/tui-data.c
+++ b/gdb/tui/tui-data.c
@@ -36,7 +36,7 @@ struct tui_win_info *tui_win_list[MAX_MAJOR_WINDOWS];
 ****************************/
 static enum tui_layout_type current_layout = UNDEFINED_LAYOUT;
 static int term_height, term_width;
-static struct tui_gen_win_info _locator (LOCATOR_WIN);
+static struct tui_locator_window _locator;
 static std::vector<tui_source_window_base *> source_windows;
 static struct tui_win_info *win_with_focus = NULL;
 static struct tui_layout_def layout_def = {
@@ -185,7 +185,7 @@ tui_data_window::clear_detail ()
 
 /* Accessor for the locator win info.  Answers a pointer to the static
    locator win info struct.  */
-struct tui_gen_win_info *
+struct tui_locator_window *
 tui_locator_win_info_ptr (void)
 {
   return &_locator;
@@ -365,6 +365,7 @@ init_content_element (struct tui_win_element *element,
 		      enum tui_win_type type)
 {
   gdb_assert (type != EXEC_INFO_WIN);
+  gdb_assert (type != LOCATOR_WIN);
 
   switch (type)
     {
@@ -393,12 +394,6 @@ init_content_element (struct tui_win_element *element,
       element->which_element.data.highlight = FALSE;
       element->which_element.data.content = NULL;
       break;
-    case LOCATOR_WIN:
-      element->which_element.locator.full_name[0] =
-	element->which_element.locator.proc_name[0] = (char) 0;
-      element->which_element.locator.line_no = 0;
-      element->which_element.locator.addr = 0;
-      break;
     default:
       break;
     }
@@ -426,6 +421,7 @@ tui_alloc_content (int num_elements, enum tui_win_type type)
   int i;
 
   gdb_assert (type != EXEC_INFO_WIN);
+  gdb_assert (type != LOCATOR_WIN);
 
   content = XNEWVEC (struct tui_win_element *, num_elements);
 
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index c5b518b..f29891c 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -214,18 +214,6 @@ struct tui_command_element
 # define MAX_LOCATOR_ELEMENT_LEN        1024
 #endif
 
-/* Elements in the locator window content.  */
-struct tui_locator_element
-{
-  /* Resolved absolute filename as returned by symtab_to_fullname.  */
-  char full_name[MAX_LOCATOR_ELEMENT_LEN];
-  char proc_name[MAX_LOCATOR_ELEMENT_LEN];
-  int line_no;
-  CORE_ADDR addr;
-  /* Architecture associated with code at this location.  */
-  struct gdbarch *gdbarch;
-};
-
 /* Flags to tell what kind of breakpoint is at current line.  */
 #define TUI_BP_ENABLED      0x01
 #define TUI_BP_DISABLED     0x02
@@ -248,7 +236,6 @@ union tui_which_element
   struct tui_gen_win_info *data_window;	/* Data display elements.  */
   struct tui_data_element data;		/* Elements of data_window.  */
   struct tui_command_element command;	/* Command elements.  */
-  struct tui_locator_element locator;	/* Locator elements.  */
 };
 
 struct tui_win_element
@@ -284,6 +271,25 @@ private:
   tui_exec_info_content *m_content = nullptr;
 };
 
+/* Locator window class.  */
+
+struct tui_locator_window : public tui_gen_win_info
+{
+  tui_locator_window ()
+    : tui_gen_win_info (LOCATOR_WIN)
+  {
+    full_name[0] = 0;
+    proc_name[0] = 0;
+  }
+
+  char full_name[MAX_LOCATOR_ELEMENT_LEN];
+  char proc_name[MAX_LOCATOR_ELEMENT_LEN];
+  int line_no = 0;
+  CORE_ADDR addr = 0;
+  /* Architecture associated with code at this location.  */
+  struct gdbarch *gdbarch = nullptr;
+};
+
 /* This defines information about each logical window.  */
 struct tui_win_info : public tui_gen_win_info
 {
@@ -572,7 +578,7 @@ extern int tui_term_height (void);
 extern void tui_set_term_height_to (int);
 extern int tui_term_width (void);
 extern void tui_set_term_width_to (int);
-extern struct tui_gen_win_info *tui_locator_win_info_ptr (void);
+extern struct tui_locator_window *tui_locator_win_info_ptr (void);
 extern std::vector<tui_source_window_base *> &tui_source_windows ();
 extern void tui_clear_source_windows (void);
 extern void tui_clear_source_windows_detail (void);
diff --git a/gdb/tui/tui-disasm.c b/gdb/tui/tui-disasm.c
index b3d39ea..6b88d96 100644
--- a/gdb/tui/tui-disasm.c
+++ b/gdb/tui/tui-disasm.c
@@ -169,7 +169,7 @@ tui_set_disassem_content (struct gdbarch *gdbarch, CORE_ADDR pc)
   int offset = TUI_DISASM_WIN->horizontal_offset;
   int max_lines, line_width;
   CORE_ADDR cur_pc;
-  struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
+  struct tui_locator_window *locator = tui_locator_win_info_ptr ();
   int tab_len = tui_tab_width;
   struct tui_asm_line *asm_lines;
   int insn_pos;
@@ -185,7 +185,7 @@ tui_set_disassem_content (struct gdbarch *gdbarch, CORE_ADDR pc)
   base->gdbarch = gdbarch;
   base->start_line_or_addr.loa = LOA_ADDRESS;
   base->start_line_or_addr.u.addr = pc;
-  cur_pc = locator->content[0]->which_element.locator.addr;
+  cur_pc = locator->addr;
 
   /* Window size, excluding highlight box.  */
   max_lines = TUI_DISASM_WIN->height - 2;
@@ -316,15 +316,13 @@ tui_show_disassem_and_update_source (struct gdbarch *gdbarch,
 void
 tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
 {
-  struct tui_gen_win_info *locator;
-  struct tui_locator_element *element;
+  struct tui_locator_window *locator;
   struct gdbarch *gdbarch = get_current_arch ();
   CORE_ADDR addr;
 
   locator = tui_locator_win_info_ptr ();
-  element = &locator->content[0]->which_element.locator;
 
-  if (element->addr == 0)
+  if (locator->addr == 0)
     {
       struct bound_minimal_symbol main_symbol;
 
@@ -342,8 +340,8 @@ tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
     }
   else				/* The target is executing.  */
     {
-      gdbarch = element->gdbarch;
-      addr = element->addr;
+      gdbarch = locator->gdbarch;
+      addr = locator->addr;
     }
 
   *gdbarch_p = gdbarch;
diff --git a/gdb/tui/tui-layout.c b/gdb/tui/tui-layout.c
index a0745bf..cf8f13f 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -634,21 +634,21 @@ show_source_disasm_command (void)
 	  TUI_SRC_WIN->m_has_locator = false;
 	}
 
-      struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
+      struct tui_locator_window *locator = tui_locator_win_info_ptr ();
+      gdb_assert (locator != nullptr);
 
       tui_show_source_content (TUI_SRC_WIN);
       if (TUI_DISASM_WIN == NULL)
 	{
 	  tui_win_list[DISASSEM_WIN]
 	    = make_disasm_window (asm_height, src_height - 1);
-	  locator
-	    = init_and_make_win (locator,
-				 LOCATOR_WIN,
-				 2 /* 1 */ ,
-				 tui_term_width (),
-				 0,
-				 (src_height + asm_height) - 1,
-				 DONT_BOX_WINDOW);
+	  init_and_make_win (locator,
+			     LOCATOR_WIN,
+			     2 /* 1 */ ,
+			     tui_term_width (),
+			     0,
+			     (src_height + asm_height) - 1,
+			     DONT_BOX_WINDOW);
 	}
       else
 	{
@@ -703,8 +703,9 @@ show_data (enum tui_layout_type new_layout)
   int total_height = (tui_term_height () - TUI_CMD_WIN->height);
   int src_height, data_height;
   enum tui_win_type win_type;
-  struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
 
+  struct tui_locator_window *locator = tui_locator_win_info_ptr ();
+  gdb_assert (locator != nullptr);
 
   data_height = total_height / 2;
   src_height = total_height - data_height;
@@ -725,8 +726,7 @@ show_data (enum tui_layout_type new_layout)
       else
 	tui_win_list[win_type]
 	  = make_disasm_window (src_height, data_height - 1);
-      locator
-	= init_and_make_win (locator,
+      init_and_make_win (locator,
 			     LOCATOR_WIN,
 			     2 /* 1 */ ,
 			     tui_term_width (),
@@ -870,7 +870,8 @@ show_source_or_disasm_and_command (enum tui_layout_type layout_type)
     {
       struct tui_win_info **win_info_ptr;
       int src_height, cmd_height;
-      struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
+      struct tui_locator_window *locator = tui_locator_win_info_ptr ();
+      gdb_assert (locator != nullptr);
 
       if (TUI_CMD_WIN != NULL)
 	cmd_height = TUI_CMD_WIN->height;
@@ -890,14 +891,13 @@ show_source_or_disasm_and_command (enum tui_layout_type layout_type)
 	    *win_info_ptr = make_source_window (src_height - 1, 0);
 	  else
 	    *win_info_ptr = make_disasm_window (src_height - 1, 0);
-	  locator
-	    = init_and_make_win (locator,
-				 LOCATOR_WIN,
-				 2 /* 1 */ ,
-				 tui_term_width (),
-				 0,
-				 src_height - 1,
-				 DONT_BOX_WINDOW);
+	  init_and_make_win (locator,
+			     LOCATOR_WIN,
+			     2 /* 1 */ ,
+			     tui_term_width (),
+			     0,
+			     src_height - 1,
+			     DONT_BOX_WINDOW);
 	  base = (tui_source_window_base *) *win_info_ptr;
 	}
       else
diff --git a/gdb/tui/tui-source.c b/gdb/tui/tui-source.c
index 54e53cf..e1448db 100644
--- a/gdb/tui/tui-source.c
+++ b/gdb/tui/tui-source.c
@@ -157,7 +157,7 @@ tui_set_source_content (struct symtab *s,
       else
 	{
 	  int cur_line_no, cur_line;
-	  struct tui_gen_win_info *locator
+	  struct tui_locator_window *locator
 	    = tui_locator_win_info_ptr ();
 	  struct tui_source_window_base *src
 	    = (struct tui_source_window_base *) TUI_SRC_WIN;
@@ -194,12 +194,9 @@ 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 (locator->content[0]
-			       ->which_element.locator.full_name,
+		(filename_cmp (locator->full_name,
 			       symtab_to_fullname (s)) == 0
-		 && cur_line_no
-		 == locator->content[0]
-		 ->which_element.locator.line_no);
+		 && cur_line_no == locator->line_no);
 
 	      xfree (TUI_SRC_WIN->content[cur_line]
 		     ->which_element.source.line);
@@ -300,8 +297,7 @@ tui_source_is_displayed (const char *fullname)
 {
   return (TUI_SRC_WIN != NULL
 	  && TUI_SRC_WIN->content_in_use 
-	  && (filename_cmp (tui_locator_win_info_ptr ()->content[0]
-			      ->which_element.locator.full_name,
+	  && (filename_cmp (tui_locator_win_info_ptr ()->full_name,
 			    fullname) == 0));
 }
 
diff --git a/gdb/tui/tui-stack.c b/gdb/tui/tui-stack.c
index efa2445..f761ac1 100644
--- a/gdb/tui/tui-stack.c
+++ b/gdb/tui/tui-stack.c
@@ -59,8 +59,8 @@ static void tui_update_command (const char *, int);
 /* Create the status line to display as much information as we can on
    this single line: target name, process number, current function,
    current line, current PC, SingleKey mode.  */
-static char*
-tui_make_status_line (struct tui_locator_element *loc)
+static char *
+tui_make_status_line (struct tui_locator_window *loc)
 {
   char *string;
   char line_buf[50], *pname;
@@ -246,17 +246,13 @@ void
 tui_show_locator_content (void)
 {
   char *string;
-  struct tui_gen_win_info *locator;
+  struct tui_locator_window *locator;
 
   locator = tui_locator_win_info_ptr ();
 
   if (locator != NULL && locator->handle != NULL)
     {
-      struct tui_win_element *element;
-
-      element = locator->content[0];
-
-      string = tui_make_status_line (&element->which_element.locator);
+      string = tui_make_status_line (locator);
       wmove (locator->handle, 0, 0);
       /* We ignore the return value from wstandout and wstandend, casting
 	 them to void in order to avoid a compiler warning.  The warning
@@ -279,18 +275,10 @@ tui_show_locator_content (void)
 static void
 tui_set_locator_fullname (const char *fullname)
 {
-  struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
-  struct tui_locator_element *element;
-
-  if (locator->content[0] == NULL)
-    {
-      tui_set_locator_info (NULL, fullname, NULL, 0, 0);
-      return;
-    }
+  struct tui_locator_window *locator = tui_locator_win_info_ptr ();
 
-  element = &locator->content[0]->which_element.locator;
-  element->full_name[0] = 0;
-  strcat_to_buf (element->full_name, MAX_LOCATOR_ELEMENT_LEN, fullname);
+  locator->full_name[0] = 0;
+  strcat_to_buf (locator->full_name, MAX_LOCATOR_ELEMENT_LEN, fullname);
 }
 
 /* Update the locator, with the provided arguments.
@@ -305,39 +293,28 @@ tui_set_locator_info (struct gdbarch *gdbarch,
 		      int lineno,
                       CORE_ADDR addr)
 {
-  struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
-  struct tui_locator_element *element;
+  struct tui_locator_window *locator = tui_locator_win_info_ptr ();
   int locator_changed_p = 0;
 
-  /* Allocate the locator content if necessary.  */
-  if (locator->content_size <= 0)
-    {
-      locator->content = tui_alloc_content (1, LOCATOR_WIN);
-      locator->content_size = 1;
-      locator_changed_p = 1;
-    }
-
   if (procname == NULL)
     procname = "";
 
   if (fullname == NULL)
     fullname = "";
 
-  element = &locator->content[0]->which_element.locator;
-
-  locator_changed_p |= strncmp (element->proc_name, procname,
+  locator_changed_p |= strncmp (locator->proc_name, procname,
 				MAX_LOCATOR_ELEMENT_LEN) != 0;
-  locator_changed_p |= lineno != element->line_no;
-  locator_changed_p |= addr != element->addr;
-  locator_changed_p |= gdbarch != element->gdbarch;
-  locator_changed_p |= strncmp (element->full_name, fullname,
+  locator_changed_p |= lineno != locator->line_no;
+  locator_changed_p |= addr != locator->addr;
+  locator_changed_p |= gdbarch != locator->gdbarch;
+  locator_changed_p |= strncmp (locator->full_name, fullname,
 				MAX_LOCATOR_ELEMENT_LEN) != 0;
 
-  element->proc_name[0] = (char) 0;
-  strcat_to_buf (element->proc_name, MAX_LOCATOR_ELEMENT_LEN, procname);
-  element->line_no = lineno;
-  element->addr = addr;
-  element->gdbarch = gdbarch;
+  locator->proc_name[0] = (char) 0;
+  strcat_to_buf (locator->proc_name, MAX_LOCATOR_ELEMENT_LEN, procname);
+  locator->line_no = lineno;
+  locator->addr = addr;
+  locator->gdbarch = gdbarch;
   tui_set_locator_fullname (fullname);
 
   return locator_changed_p;
@@ -366,7 +343,7 @@ tui_show_frame_info (struct frame_info *fi)
     {
       int start_line;
       CORE_ADDR low;
-      struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
+      struct tui_locator_window *locator = tui_locator_win_info_ptr ();
       int source_already_displayed;
       CORE_ADDR pc;
 
@@ -398,12 +375,9 @@ tui_show_frame_info (struct frame_info *fi)
       start_line = 0;
       for (struct tui_source_window_base *win_info : tui_source_windows ())
 	{
-	  union tui_which_element *item;
-
-	  item = &locator->content[0]->which_element;
 	  if (win_info == TUI_SRC_WIN)
 	    {
-	      start_line = (item->locator.line_no -
+	      start_line = (locator->line_no -
 			   (win_info->viewport_height / 2)) + 1;
 	      if (start_line <= 0)
 		start_line = 1;
@@ -429,13 +403,13 @@ tui_show_frame_info (struct frame_info *fi)
 	      l.loa = LOA_LINE;
 	      l.u.line_no = start_line;
 	      if (!(source_already_displayed
-		    && tui_line_is_displayed (item->locator.line_no,
+		    && tui_line_is_displayed (locator->line_no,
 					      win_info, TRUE)))
 		tui_update_source_window (win_info, get_frame_arch (fi),
 					  sal.symtab, l, TRUE);
 	      else
 		{
-		  l.u.line_no = item->locator.line_no;
+		  l.u.line_no = locator->line_no;
 		  win_info->set_is_exec_point_at (l);
 		}
 	    }
@@ -447,13 +421,13 @@ tui_show_frame_info (struct frame_info *fi)
 
 		  a.loa = LOA_ADDRESS;
 		  a.u.addr = low;
-		  if (!tui_addr_is_displayed (item->locator.addr,
+		  if (!tui_addr_is_displayed (locator->addr,
 					      win_info, TRUE))
 		    tui_update_source_window (win_info, get_frame_arch (fi),
 					      sal.symtab, a, TRUE);
 		  else
 		    {
-		      a.u.addr = item->locator.addr;
+		      a.u.addr = locator->addr;
 		      win_info->set_is_exec_point_at (a);
 		    }
 		}
diff --git a/gdb/tui/tui-win.c b/gdb/tui/tui-win.c
index b2eb0a6..f43e11a 100644
--- a/gdb/tui/tui-win.c
+++ b/gdb/tui/tui-win.c
@@ -556,7 +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;
-      struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
+      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;
 
@@ -1099,7 +1099,7 @@ tui_adjust_win_heights (struct tui_win_info *primary_win_info,
 	{
 	  int diff;
 	  struct tui_win_info *win_info;
-	  struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
+	  struct tui_locator_window *locator = tui_locator_win_info_ptr ();
 	  enum tui_layout_type cur_layout = tui_current_layout ();
 
 	  diff = (new_height - primary_win_info->height) * (-1);
@@ -1255,7 +1255,7 @@ tui_source_window_base::set_new_height (int height)
 
   if (has_locator ())
     {
-      tui_gen_win_info *gen_win_info = tui_locator_win_info_ptr ();
+      tui_locator_window *gen_win_info = tui_locator_win_info_ptr ();
       tui_make_invisible (gen_win_info);
       gen_win_info->origin.y = origin.y + height;
     }
diff --git a/gdb/tui/tui-wingeneral.c b/gdb/tui/tui-wingeneral.c
index 98eb5ab..9bc4e2b 100644
--- a/gdb/tui/tui-wingeneral.c
+++ b/gdb/tui/tui-wingeneral.c
@@ -266,7 +266,7 @@ void
 tui_refresh_all (struct tui_win_info **list)
 {
   int type;
-  struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
+  struct tui_locator_window *locator = tui_locator_win_info_ptr ();
 
   for (type = SRC_WIN; (type < MAX_MAJOR_WINDOWS); type++)
     {