Kill init_sal

Instead, make symtab_and_line initialize its members itself.  Many
symtab_and_line declarations are moved to where the object is
initialized at the same time both for clarity and to avoid double
initialization.  A few functions, like e.g., find_frame_sal are
adjusted to return the sal using normal function return instead of an
output parameter likewise to avoid having to default-construct a sal
and then immediately have the object overwritten.

gdb/ChangeLog:
2017-09-04  Pedro Alves  <palves@redhat.com>

	* ada-lang.c (is_known_support_routine): Move sal declaration to
	where it is initialized.
	* breakpoint.c (create_internal_breakpoint, init_catchpoint)
	(parse_breakpoint_sals, decode_static_tracepoint_spec)
	(clear_command, update_static_tracepoint): Remove init_sal
	references.  Move declarations closer to initializations.
	* cli/cli-cmds.c (list_command): Move sal declarations closer to
	initializations.
	* elfread.c (elf_gnu_ifunc_resolver_stop): Remove init_sal
	references.  Move sal declarations closer to initializations.
	* frame.c (find_frame_sal): Return a symtab_and_line via function
	return instead of output parameter.  Remove init_sal references.
	* frame.h (find_frame_sal): Return a symtab_and_line via function
	return instead of output parameter.
	* guile/scm-frame.c (gdbscm_frame_sal): Adjust.
	* guile/scm-symtab.c (stscm_make_sal_smob): Use in-place new
	instead of memset.
	(gdbscm_find_pc_line): Remove init_sal reference.
	* infcall.c (call_function_by_hand_dummy): Remove init_sal
	references.  Move declarations closer to initializations.
	* infcmd.c (set_step_frame): Update.  Move declarations closer to
	initializations.
	(finish_backward): Remove init_sal references.  Move declarations
	closer to initializations.
	* infrun.c (process_event_stop_test, handle_step_into_function)
	(insert_hp_step_resume_breakpoint_at_frame)
	(insert_step_resume_breakpoint_at_caller): Likewise.
	* linespec.c (create_sals_line_offset, decode_digits_ordinary)
	(symbol_to_sal): Likewise.
	* probe.c (parse_probes_in_pspace): Remove init_sal reference.
	* python/py-frame.c (frapy_find_sal): Move sal declaration closer
	to its initialization.
	* reverse.c (save_bookmark_command): Use new/delete.  Remove
	init_sal references.  Move declarations closer to initializations.
	* source.c (get_current_source_symtab_and_line): Remove brace
	initialization.
	(set_current_source_symtab_and_line): Now takes the sal by const
	reference.  Remove brace initialization.
	(line_info): Remove init_sal reference.
	* source.h (set_current_source_symtab_and_line): Now takes a
	symtab_and_line via const reference.
	* stack.c (set_current_sal_from_frame): Adjust.
	(print_frame_info): Adjust.
	(get_last_displayed_sal): Return the sal via function return
	instead of via output parameter.  Simplify.
	(frame_info): Adjust.
	* stack.h (get_last_displayed_sal): Return the sal via function
	return instead of via output parameter.
	* symtab.c (init_sal): Delete.
	(find_pc_sect_line): Remove init_sal references.  Move
	declarations closer to initializations.
	(find_function_start_sal): Remove init_sal references.  Move
	declarations closer to initializations.
	* symtab.h (struct symtab_and_line): In-class initialize all
	fields.
	* tracepoint.c (set_traceframe_context)
	(print_one_static_tracepoint_marker): Remove init_sal references.
	Move declarations closer to initializations.
	* tui/tui-disasm.c (tui_show_disassem_and_update_source): Adjust.
	* tui/tui-stack.c (tui_show_frame_info): Adjust.  Move
	declarations closer to initializations.
	* tui/tui-winsource.c (tui_update_source_window_as_is): Remove
	init_sal references.  Adjust.

1 files changed, 11 insertions, 14 deletions

diff --git a/gdb/frame.c b/gdb/frame.c
index 30e4aea..55d4ddb 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -2506,8 +2506,8 @@ get_frame_address_in_block_if_available (struct frame_info *this_frame,
   return 1;
 }
 
-void
-find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal)
+symtab_and_line
+find_frame_sal (frame_info *frame)
 {
   struct frame_info *next_frame;
   int notcurrent;
@@ -2528,21 +2528,21 @@ find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal)
 
       /* If frame is inline, it certainly has symbols.  */
       gdb_assert (sym);
-      init_sal (sal);
+
+      symtab_and_line sal;
       if (SYMBOL_LINE (sym) != 0)
 	{
-	  sal->symtab = symbol_symtab (sym);
-	  sal->line = SYMBOL_LINE (sym);
+	  sal.symtab = symbol_symtab (sym);
+	  sal.line = SYMBOL_LINE (sym);
 	}
       else
 	/* If the symbol does not have a location, we don't know where
 	   the call site is.  Do not pretend to.  This is jarring, but
 	   we can't do much better.  */
-	sal->pc = get_frame_pc (frame);
+	sal.pc = get_frame_pc (frame);
 
-      sal->pspace = get_frame_program_space (frame);
-
-      return;
+      sal.pspace = get_frame_program_space (frame);
+      return sal;
     }
 
   /* If FRAME is not the innermost frame, that normally means that
@@ -2555,13 +2555,10 @@ find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal)
      instruction/line, consequently, for such cases, want to get the
      line containing fi->pc.  */
   if (!get_frame_pc_if_available (frame, &pc))
-    {
-      init_sal (sal);
-      return;
-    }
+    return {};
 
   notcurrent = (pc != get_frame_address_in_block (frame));
-  (*sal) = find_pc_line (pc, notcurrent);
+  return find_pc_line (pc, notcurrent);
 }
 
 /* Per "frame.h", return the ``address'' of the frame.  Code should