Always create an execution info window for a source window

A source or disassembly window will always have an "execution info"
window (the window along the side that displays breakpoint info), but
this isn't immediately clear from the source.  As a result, some code
has checks to see whether the execution_info is NULL.

This changes the source window base class to always instantiate an
execution_info window, then updates the rest of the code.  It also
simplifies window creation in tui-layout.c.

gdb/ChangeLog
2019-07-17  Tom Tromey  <tom@tromey.com>

	* tui/tui-winsource.c (tui_set_exec_info_content): Remove
	condition.
	* tui/tui-wingeneral.c (tui_source_window_base::make_visible):
	Remove condition.
	* tui/tui-source.c (tui_source_window_base::reset): New method.
	* tui/tui-layout.c (make_command_window): Don't call
	init_and_make_win.
	(make_source_window, make_disasm_window): Don't call
	make_source_or_disasm_window.
	(make_data_window): Don't call init_and_make_win.  Change calling
	convention.
	(show_source_disasm_command, show_data): Simplify.
	(make_source_or_disasm_window): Remove.
	(show_source_or_disasm_and_command): Simplify.
	* tui/tui-data.h (struct tui_gen_win_info) <reset>: Now virtual.
	(struct tui_source_window_base) <reset>: Likewise.
	<execution_info>: Remove initializer.
	* tui/tui-data.c (tui_source_window_base): Initialize
	execution_info.

6 files changed, 83 insertions, 126 deletions

diff --git a/gdb/tui/tui-data.c b/gdb/tui/tui-data.c
index 396635b..ee5b3aa 100644
--- a/gdb/tui/tui-data.c
+++ b/gdb/tui/tui-data.c
@@ -332,7 +332,8 @@ tui_win_info::tui_win_info (enum tui_win_type type)
 }
 
 tui_source_window_base::tui_source_window_base (enum tui_win_type type)
-  : tui_win_info (type)
+  : tui_win_info (type),
+    execution_info (new tui_exec_info_window ())
 {
   gdb_assert (type == SRC_WIN || type == DISASSEM_WIN);
   start_line_or_addr.loa = LOA_ADDRESS;
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index fcbb940..9bcfe4c 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -61,9 +61,9 @@ public:
   /* Reset this window.  WIN_TYPE must match the existing type of this
      window (it is only passed for self-test purposes).  The other
      parameters are used to set the window's size and position.  */
-  void reset (enum tui_win_type win_type,
-	      int height, int width,
-	      int origin_x, int origin_y);
+  virtual void reset (enum tui_win_type win_type,
+		      int height, int width,
+		      int origin_x, int origin_y);
 
   /* Window handle.  */
   WINDOW *handle = nullptr;
@@ -395,10 +395,14 @@ public:
      LINE_NO in this source window; false otherwise.  */
   virtual bool location_matches_p (struct bp_location *loc, int line_no) = 0;
 
+  void reset (enum tui_win_type win_type,
+	      int height, int width,
+	      int origin_x, int origin_y) override;
+
   /* Does the locator belong to this window?  */
   bool m_has_locator = false;
   /* Execution information window.  */
-  struct tui_exec_info_window *execution_info = nullptr;
+  struct tui_exec_info_window *execution_info;
   /* 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 ac0d01c..23537b7 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -48,12 +48,9 @@ static tui_gen_win_info *init_and_make_win (tui_gen_win_info *,
 					    int, int, int, int,
 					    enum tui_box);
 static void show_source_or_disasm_and_command (enum tui_layout_type);
-static struct tui_win_info *make_source_or_disasm_window (enum tui_win_type, 
-							  int, int);
 static struct tui_win_info *make_command_window (int, int);
 static struct tui_win_info *make_source_window (int, int);
 static struct tui_win_info *make_disasm_window (int, int);
-static void make_data_window (struct tui_win_info **, int, int);
 static void show_source_command (void);
 static void show_disasm_command (void);
 static void show_source_disasm_command (void);
@@ -522,14 +519,9 @@ prev_layout (void)
 static struct tui_win_info *
 make_command_window (int height, int origin_y)
 {
-  struct tui_win_info *result
-    = (struct tui_win_info *) init_and_make_win (NULL,
-						 CMD_WIN,
-						 height,
-						 tui_term_width (),
-						 0,
-						 origin_y,
-						 DONT_BOX_WINDOW);
+  struct tui_win_info *result = new tui_cmd_window ();
+  result->reset (CMD_WIN, height, tui_term_width (), 0, origin_y);
+  tui_make_window (result, DONT_BOX_WINDOW);
   return result;
 }
 
@@ -539,8 +531,11 @@ make_command_window (int height, int origin_y)
 static struct tui_win_info *
 make_source_window (int height, int origin_y)
 {
-  return make_source_or_disasm_window (SRC_WIN, height, origin_y);
-}				/* make_source_window */
+  tui_win_info *result = new tui_source_window ();
+  result->reset (SRC_WIN, height, tui_term_width (), 0, origin_y);
+  result->make_visible (true);
+  return result;
+}
 
 
 /* make_disasm_window().
@@ -548,22 +543,20 @@ make_source_window (int height, int origin_y)
 static struct tui_win_info *
 make_disasm_window (int height, int origin_y)
 {
-  return make_source_or_disasm_window (DISASSEM_WIN, height, origin_y);
-}				/* make_disasm_window */
+  tui_win_info *result = new tui_disasm_window ();
+  result->reset (SRC_WIN, height, tui_term_width (), 0, origin_y);
+  result->make_visible (true);
+  return result;
+}
 
 
-static void
-make_data_window (struct tui_win_info **win_info_ptr, 
-		  int height, int origin_y)
+static tui_win_info *
+make_data_window (int height, int origin_y)
 {
-  *win_info_ptr
-    = (struct tui_win_info *) init_and_make_win (*win_info_ptr,
-						 DATA_WIN,
-						 height,
-						 tui_term_width (),
-						 0,
-						 origin_y,
-						 BOX_WINDOW);
+  tui_win_info *result = new tui_data_window ();
+  result->reset (DATA_WIN, height, tui_term_width (), 0, origin_y);
+  result->make_visible (true);
+  return result;
 }
 
 
@@ -606,16 +599,10 @@ show_source_disasm_command (void)
 	{
 	  TUI_SRC_WIN->reset (TUI_SRC_WIN->type,
 			      src_height,
-			      TUI_SRC_WIN->width,
-			      TUI_SRC_WIN->execution_info->width,
+			      tui_term_width (),
+			      0,
 			      0);
-	  TUI_SRC_WIN->execution_info->reset (EXEC_INFO_WIN,
-					      src_height,
-					      3,
-					      0,
-					      0);
 	  tui_make_visible (TUI_SRC_WIN);
-	  tui_make_visible (TUI_SRC_WIN->execution_info);
 	  TUI_SRC_WIN->m_has_locator = false;
 	}
 
@@ -645,16 +632,10 @@ show_source_disasm_command (void)
 	  TUI_DISASM_WIN->m_has_locator = true;
 	  TUI_DISASM_WIN->reset (TUI_DISASM_WIN->type,
 				 asm_height,
-				 TUI_DISASM_WIN->width,
-				 TUI_DISASM_WIN->execution_info->width,
+				 tui_term_width (),
+				 0,
 				 src_height - 1);
-	  TUI_DISASM_WIN->execution_info->reset (EXEC_INFO_WIN,
-						 asm_height,
-						 3,
-						 0,
-						 src_height - 1);
 	  tui_make_visible (TUI_DISASM_WIN);
-	  tui_make_visible (TUI_DISASM_WIN->execution_info);
 	}
       TUI_SRC_WIN->m_has_locator = false;
       TUI_DISASM_WIN->m_has_locator = true;
@@ -695,7 +676,12 @@ show_data (enum tui_layout_type new_layout)
   src_height = total_height - data_height;
   tui_make_all_invisible ();
   tui_make_invisible (locator);
-  make_data_window (&tui_win_list[DATA_WIN], data_height, 0);
+  if (tui_win_list[DATA_WIN] == nullptr)
+    tui_win_list[DATA_WIN] = make_data_window (data_height, 0);
+  else
+    tui_win_list[DATA_WIN]->reset (data_height, tui_term_width (), 0, 0);
+  tui_win_list[DATA_WIN]->make_visible (true);
+
   if (new_layout == SRC_DATA_COMMAND)
     win_type = SRC_WIN;
   else
@@ -724,16 +710,10 @@ show_data (enum tui_layout_type new_layout)
       base = (tui_source_window_base *) tui_win_list[win_type];
       tui_win_list[win_type]->reset (tui_win_list[win_type]->type,
 				     src_height,
-				     tui_win_list[win_type]->width,
-				     base->execution_info->width,
+				     tui_term_width (),
+				     0,
 				     data_height - 1);
-      base->execution_info->reset (EXEC_INFO_WIN,
-				   src_height,
-				   3,
-				   0,
-				   data_height - 1);
       tui_make_visible (tui_win_list[win_type]);
-      tui_make_visible (base->execution_info);
       locator->reset (LOCATOR_WIN,
 		      2 /* 1 */ ,
 		      tui_term_width (),
@@ -816,34 +796,6 @@ init_and_make_win (tui_gen_win_info *win_info,
 }
 
 
-static struct tui_win_info *
-make_source_or_disasm_window (enum tui_win_type type,
-			      int height, int origin_y)
-{
-  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
-    = ((struct tui_source_window_base *)
-       init_and_make_win (NULL,
-			  type,
-			  height,
-			  tui_term_width () - execution_info->width,
-			  execution_info->width,
-			  origin_y,
-			  BOX_WINDOW));
-  result->execution_info = execution_info;
-  return result;
-}
-
-
 /* Show the Source/Command or the Disassem layout.  */
 static void
 show_source_or_disasm_and_command (enum tui_layout_type layout_type)
@@ -893,16 +845,10 @@ show_source_or_disasm_and_command (enum tui_layout_type layout_type)
 	  base->m_has_locator = true;
 	  (*win_info_ptr)->reset ((*win_info_ptr)->type,
 				  src_height - 1,
-				  (*win_info_ptr)->width,
-				  base->execution_info->width,
+				  tui_term_width (),
+				  0,
 				  0);
-	  base->execution_info->reset (EXEC_INFO_WIN,
-				       src_height - 1,
-				       3,
-				       0,
-				       0);
 	  tui_make_visible (*win_info_ptr);
-	  tui_make_visible (base->execution_info);
 	}
 
       base->m_has_locator = true;
diff --git a/gdb/tui/tui-source.c b/gdb/tui/tui-source.c
index f0bac24..873612f 100644
--- a/gdb/tui/tui-source.c
+++ b/gdb/tui/tui-source.c
@@ -291,3 +291,13 @@ tui_source_window::location_matches_p (struct bp_location *loc, int line_no)
 	  && filename_cmp (fullname,
 			   symtab_to_fullname (loc->symtab)) == 0);
 }
+
+void
+tui_source_window_base::reset (enum tui_win_type win_type,
+			       int height, int width,
+			       int origin_x, int origin_y)
+{
+  tui_gen_win_info::reset (win_type, height, width - 3,
+			   origin_x + 3, origin_y);
+  execution_info->reset (EXEC_INFO_WIN, height, 3, origin_x, origin_y);
+}
diff --git a/gdb/tui/tui-wingeneral.c b/gdb/tui/tui-wingeneral.c
index dc008cd..3dca621 100644
--- a/gdb/tui/tui-wingeneral.c
+++ b/gdb/tui/tui-wingeneral.c
@@ -201,8 +201,7 @@ tui_make_invisible (struct tui_gen_win_info *win_info)
 void
 tui_source_window_base::make_visible (bool visible)
 {
-  if (execution_info != nullptr)
-    execution_info->make_visible (visible);
+  execution_info->make_visible (visible);
   tui_win_info::make_visible (visible);
 }
 
diff --git a/gdb/tui/tui-winsource.c b/gdb/tui/tui-winsource.c
index 38d5532..d9f6425 100644
--- a/gdb/tui/tui-winsource.c
+++ b/gdb/tui/tui-winsource.c
@@ -469,39 +469,36 @@ tui_exec_info_window::maybe_allocate_content (int n_elements)
 void
 tui_set_exec_info_content (struct tui_source_window_base *win_info)
 {
-  if (win_info->execution_info != NULL)
-    {
-      tui_exec_info_content *content
-	= win_info->execution_info->maybe_allocate_content (win_info->height);
+  tui_exec_info_content *content
+    = win_info->execution_info->maybe_allocate_content (win_info->height);
 
-      tui_update_breakpoint_info (win_info, nullptr, true);
-      for (int i = 0; i < win_info->content.size (); i++)
-	{
-	  tui_exec_info_content &element = content[i];
-	  struct tui_source_element *src_element;
-	  tui_bp_flags mode;
-
-	  src_element = &win_info->content[i];
-
-	  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->break_mode;
-	  if (mode & TUI_BP_HIT)
-	    element[TUI_BP_HIT_POS] = (mode & TUI_BP_HARDWARE) ? 'H' : 'B';
-	  else if (mode & (TUI_BP_ENABLED | TUI_BP_DISABLED))
-	    element[TUI_BP_HIT_POS] = (mode & TUI_BP_HARDWARE) ? 'h' : 'b';
-
-	  if (mode & TUI_BP_ENABLED)
-	    element[TUI_BP_BREAK_POS] = '+';
-	  else if (mode & TUI_BP_DISABLED)
-	    element[TUI_BP_BREAK_POS] = '-';
-
-	  if (src_element->is_exec_point)
-	    element[TUI_EXEC_POS] = '>';
-	}
+  tui_update_breakpoint_info (win_info, nullptr, true);
+  for (int i = 0; i < win_info->content.size (); i++)
+    {
+      tui_exec_info_content &element = content[i];
+      struct tui_source_element *src_element;
+      tui_bp_flags mode;
+
+      src_element = &win_info->content[i];
+
+      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->break_mode;
+      if (mode & TUI_BP_HIT)
+	element[TUI_BP_HIT_POS] = (mode & TUI_BP_HARDWARE) ? 'H' : 'B';
+      else if (mode & (TUI_BP_ENABLED | TUI_BP_DISABLED))
+	element[TUI_BP_HIT_POS] = (mode & TUI_BP_HARDWARE) ? 'h' : 'b';
+
+      if (mode & TUI_BP_ENABLED)
+	element[TUI_BP_BREAK_POS] = '+';
+      else if (mode & TUI_BP_DISABLED)
+	element[TUI_BP_BREAK_POS] = '-';
+
+      if (src_element->is_exec_point)
+	element[TUI_EXEC_POS] = '>';
     }
 }