[src/trunk]: src/usr.bin/xlint/lint1 lint: migrate check_tag_usage to warning_at

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/49c878a4f638
branches:  trunk
changeset: 961404:49c878a4f638
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Apr 18 09:07:36 2021 +0000

description:
lint: migrate check_tag_usage to warning_at

This one is already a little trickier since it does not restore the
original curr_pos.  This function is only called in a few places, and
these either restore curr_pos themselves or only call functions
afterwards that immediately overwrite curr_pos.

Except for lint_assert, which may now report a different location.

The call to check_global_variable that is related to check_tag_usage was
the function that started this whole refactoring since its lint_assert
reported a completely wrong location when using a compound literal in an
initializer expression at block level 0.

diffstat:

 usr.bin/xlint/lint1/decl.c |  11 +++++------
 1 files changed, 5 insertions(+), 6 deletions(-)

diffs (41 lines):

diff -r 7b9f5f5d7a64 -r 49c878a4f638 usr.bin/xlint/lint1/decl.c
--- a/usr.bin/xlint/lint1/decl.c        Sun Apr 18 08:57:57 2021 +0000
+++ b/usr.bin/xlint/lint1/decl.c        Sun Apr 18 09:07:36 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: decl.c,v 1.173 2021/04/18 08:57:57 rillig Exp $ */
+/* $NetBSD: decl.c,v 1.174 2021/04/18 09:07:36 rillig Exp $ */
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All Rights Reserved.
@@ -38,7 +38,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: decl.c,v 1.173 2021/04/18 08:57:57 rillig Exp $");
+__RCSID("$NetBSD: decl.c,v 1.174 2021/04/18 09:07:36 rillig Exp $");
 #endif
 
 #include <sys/param.h>
@@ -3142,19 +3142,18 @@
        if (!zflag || dcs->d_ctx != EXTERN)
                return;
 
-       curr_pos = sym->s_def_pos;
        switch (sym->s_type->t_tspec) {
        case STRUCT:
                /* struct %s never defined */
-               warning(233, sym->s_name);
+               warning_at(233, sym->s_def_pos, sym->s_name);
                break;
        case UNION:
                /* union %s never defined */
-               warning(234, sym->s_name);
+               warning_at(234, sym->s_def_pos, sym->s_name);
                break;
        case ENUM:
                /* enum %s never defined */
-               warning(235, sym->s_name);
+               warning_at(235, sym->s_def_pos, sym->s_name);
                break;
        default:
                lint_assert(/*CONSTCOND*/false);