Separate out execution-info window

This pulls the EXEC_INFO_WIN case out into its own subclass of
tui_gen_win_info.  This lets us remove an element from
union tui_which_element.

gdb/ChangeLog
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.
	* tui/tui-layout.c (init_and_make_win): Add EXEC_INFO_WIN case.
	(make_source_or_disasm_window): Add cast.
	* tui/tui-data.h (union tui_which_element) <simple_string>:
	Remove.
	(struct tui_source_info): New.
	(struct tui_source_window_base) <execution_info>: Change type.
	* tui/tui-data.c (init_content_element): Remove EXEC_INFO_WIN
	case, and add assert.
	(tui_alloc_content): Add assert.

5 files changed, 84 insertions, 37 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 42308e0..51fd84f 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,20 @@
 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.
+	* tui/tui-layout.c (init_and_make_win): Add EXEC_INFO_WIN case.
+	(make_source_or_disasm_window): Add cast.
+	* tui/tui-data.h (union tui_which_element) <simple_string>:
+	Remove.
+	(struct tui_source_info): New.
+	(struct tui_source_window_base) <execution_info>: Change type.
+	* tui/tui-data.c (init_content_element): Remove EXEC_INFO_WIN
+	case, and add assert.
+	(tui_alloc_content): Add assert.
+
+2019-06-25  Tom Tromey  <tom@tromey.com>
+
 	* tui/tui-data.h (tui_alloc_win_info): Don't declare.
 	* tui/tui-layout.c (init_and_make_win): Use "new" directly.
 	* tui/tui-data.c (tui_alloc_win_info): Remove.
diff --git a/gdb/tui/tui-data.c b/gdb/tui/tui-data.c
index 5eac1dc..119d249 100644
--- a/gdb/tui/tui-data.c
+++ b/gdb/tui/tui-data.c
@@ -364,6 +364,8 @@ static void
 init_content_element (struct tui_win_element *element, 
 		      enum tui_win_type type)
 {
+  gdb_assert (type != EXEC_INFO_WIN);
+
   switch (type)
     {
     case SRC_WIN:
@@ -397,10 +399,6 @@ init_content_element (struct tui_win_element *element,
       element->which_element.locator.line_no = 0;
       element->which_element.locator.addr = 0;
       break;
-    case EXEC_INFO_WIN:
-      memset(element->which_element.simple_string, ' ',
-             sizeof(element->which_element.simple_string));
-      break;
     default:
       break;
     }
@@ -427,6 +425,8 @@ tui_alloc_content (int num_elements, enum tui_win_type type)
   struct tui_win_element *element_block_ptr;
   int i;
 
+  gdb_assert (type != EXEC_INFO_WIN);
+
   content = XNEWVEC (struct tui_win_element *, num_elements);
 
   /*
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index a82cbb5..c5b518b 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -249,7 +249,6 @@ union tui_which_element
   struct tui_data_element data;		/* Elements of data_window.  */
   struct tui_command_element command;	/* Command elements.  */
   struct tui_locator_element locator;	/* Locator elements.  */
-  tui_exec_info_content simple_string;	/* Simple char based elements.  */
 };
 
 struct tui_win_element
@@ -257,6 +256,34 @@ struct tui_win_element
   union tui_which_element which_element;
 };
 
+/* Execution info window class.  */
+
+struct tui_exec_info_window : public tui_gen_win_info
+{
+  tui_exec_info_window ()
+    : tui_gen_win_info (EXEC_INFO_WIN)
+  {
+  }
+
+  ~tui_exec_info_window () override
+  {
+    xfree (m_content);
+  }
+
+  /* Get or allocate contents.  */
+  tui_exec_info_content *maybe_allocate_content (int n_elements);
+
+  /* Return the contents.  */
+  const tui_exec_info_content *get_content () const
+  {
+    return m_content;
+  }
+
+private:
+
+  tui_exec_info_content *m_content = nullptr;
+};
+
 /* This defines information about each logical window.  */
 struct tui_win_info : public tui_gen_win_info
 {
@@ -380,7 +407,7 @@ public:
   /* Does the locator belong to this window?  */
   bool m_has_locator = false;
   /* Execution information window.  */
-  struct tui_gen_win_info *execution_info = nullptr;
+  struct tui_exec_info_window *execution_info = nullptr;
   /* Used for horizontal scroll.  */
   int horizontal_offset = 0;
   struct tui_line_or_address start_line_or_addr;
diff --git a/gdb/tui/tui-layout.c b/gdb/tui/tui-layout.c
index 6d34392..a0745bf 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -816,6 +816,10 @@ init_and_make_win (tui_gen_win_info *win_info,
 	  win_info = new tui_cmd_window ();
 	  break;
 
+	case EXEC_INFO_WIN:
+	  win_info = new tui_exec_info_window ();
+	  break;
+
 	default:
 	  gdb_assert (tui_win_is_auxillary (win_type));
 	  win_info = new tui_gen_win_info (win_type);
@@ -834,14 +838,14 @@ static struct tui_win_info *
 make_source_or_disasm_window (enum tui_win_type type,
 			      int height, int origin_y)
 {
-  struct tui_gen_win_info *execution_info
-    = init_and_make_win (nullptr,
-			 EXEC_INFO_WIN,
-			 height,
-			 3,
-			 0,
-			 origin_y,
-			 DONT_BOX_WINDOW);
+  struct tui_exec_info_window *execution_info
+    = (tui_exec_info_window *) init_and_make_win (nullptr,
+						  EXEC_INFO_WIN,
+						  height,
+						  3,
+						  0,
+						  origin_y,
+						  DONT_BOX_WINDOW);
 
   /* Now create the source window.  */
   struct tui_source_window_base *result
diff --git a/gdb/tui/tui-winsource.c b/gdb/tui/tui-winsource.c
index e56fbcb..204fee1 100644
--- a/gdb/tui/tui-winsource.c
+++ b/gdb/tui/tui-winsource.c
@@ -470,6 +470,16 @@ tui_update_breakpoint_info (struct tui_win_info *win,
   return need_refresh;
 }
 
+/* See tui-data.h.  */
+
+tui_exec_info_content *
+tui_exec_info_window::maybe_allocate_content (int n_elements)
+{
+  if (m_content == nullptr)
+    m_content = XNEWVEC (tui_exec_info_content, n_elements);
+  return m_content;
+}
+
 
 /* Function to initialize the content of the execution info window,
    based upon the input window which is either the source or
@@ -479,45 +489,37 @@ tui_set_exec_info_content (struct tui_source_window_base *win_info)
 {
   if (win_info->execution_info != NULL)
     {
-      struct tui_gen_win_info *exec_info_ptr = win_info->execution_info;
-
-      if (exec_info_ptr->content == NULL)
-	exec_info_ptr->content =
-	  tui_alloc_content (win_info->height, exec_info_ptr->type);
+      tui_exec_info_content *content
+	= win_info->execution_info->maybe_allocate_content (win_info->height);
 
       tui_update_breakpoint_info (win_info, 1);
       for (int i = 0; i < win_info->content_size; i++)
 	{
-	  struct tui_win_element *element;
+	  tui_exec_info_content &element = content[i];
 	  struct tui_win_element *src_element;
 	  int mode;
 
-	  element = exec_info_ptr->content[i];
 	  src_element = win_info->content[i];
 
-	  memset(element->which_element.simple_string, ' ',
-		 sizeof(element->which_element.simple_string));
-	  element->which_element.simple_string[TUI_EXECINFO_SIZE - 1] = 0;
+	  memset (element, ' ', sizeof (tui_exec_info_content));
+	  element[TUI_EXECINFO_SIZE - 1] = 0;
 
 	  /* Now update the exec info content based upon the state
 	     of each line as indicated by the source content.  */
 	  mode = src_element->which_element.source.has_break;
 	  if (mode & TUI_BP_HIT)
-	    element->which_element.simple_string[TUI_BP_HIT_POS] =
-	      (mode & TUI_BP_HARDWARE) ? 'H' : 'B';
+	    element[TUI_BP_HIT_POS] = (mode & TUI_BP_HARDWARE) ? 'H' : 'B';
 	  else if (mode & (TUI_BP_ENABLED | TUI_BP_DISABLED))
-	    element->which_element.simple_string[TUI_BP_HIT_POS] =
-	      (mode & TUI_BP_HARDWARE) ? 'h' : 'b';
+	    element[TUI_BP_HIT_POS] = (mode & TUI_BP_HARDWARE) ? 'h' : 'b';
 
 	  if (mode & TUI_BP_ENABLED)
-	    element->which_element.simple_string[TUI_BP_BREAK_POS] = '+';
+	    element[TUI_BP_BREAK_POS] = '+';
 	  else if (mode & TUI_BP_DISABLED)
-	    element->which_element.simple_string[TUI_BP_BREAK_POS] = '-';
+	    element[TUI_BP_BREAK_POS] = '-';
 
 	  if (src_element->which_element.source.is_exec_point)
-	    element->which_element.simple_string[TUI_EXEC_POS] = '>';
+	    element[TUI_EXEC_POS] = '>';
 	}
-      exec_info_ptr->content_size = win_info->content_size;
     }
 }
 
@@ -525,17 +527,16 @@ tui_set_exec_info_content (struct tui_source_window_base *win_info)
 void
 tui_show_exec_info_content (struct tui_source_window_base *win_info)
 {
-  struct tui_gen_win_info *exec_info = win_info->execution_info;
-  int cur_line;
+  struct tui_exec_info_window *exec_info = win_info->execution_info;
+  const tui_exec_info_content *content = exec_info->get_content ();
 
   werase (exec_info->handle);
   exec_info->refresh_window ();
-  for (cur_line = 1; (cur_line <= exec_info->content_size); cur_line++)
+  for (int cur_line = 1; (cur_line <= win_info->content_size); cur_line++)
     mvwaddstr (exec_info->handle,
 	       cur_line,
 	       0,
-	       (char *) exec_info->content[cur_line - 1]
-			  ->which_element.simple_string);
+	       content[cur_line - 1]);
   exec_info->refresh_window ();
   exec_info->content_in_use = TRUE;
 }