[src/trunk]: src/usr.bin/xlint/lint1 lint: preserve curr_pos when checking wh...

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

details:   https://anonhg.NetBSD.org/src/rev/a87c5d475be2
branches:  trunk
changeset: 961777:a87c5d475be2
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Apr 18 09:37:18 2021 +0000

description:
lint: preserve curr_pos when checking whether a symbol is used

At the end of a function definition (funcend), curr_pos was not
restored, probably because the very next action is to read the next
token, which will then set curr_pos.

Again, this may affect the location reported in assertion failures,
everything else is unchanged.

diffstat:

 usr.bin/xlint/lint1/decl.c |  45 +++++++++++++++++----------------------------
 1 files changed, 17 insertions(+), 28 deletions(-)

diffs (104 lines):

diff -r df79b2df213b -r a87c5d475be2 usr.bin/xlint/lint1/decl.c
--- a/usr.bin/xlint/lint1/decl.c        Sun Apr 18 09:20:43 2021 +0000
+++ b/usr.bin/xlint/lint1/decl.c        Sun Apr 18 09:37:18 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: decl.c,v 1.176 2021/04/18 09:20:43 rillig Exp $ */
+/* $NetBSD: decl.c,v 1.177 2021/04/18 09:37:18 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 1.176 2021/04/18 09:20:43 rillig Exp $");
+__RCSID("$NetBSD: decl.c,v 1.177 2021/04/18 09:37:18 rillig Exp $");
 #endif
 
 #include <sys/param.h>
@@ -3008,26 +3008,18 @@
 void
 check_usage_sym(bool novar, sym_t *sym)
 {
-       pos_t   cpos;
 
        if (sym->s_block_level == -1)
                return;
 
-       cpos = curr_pos;
-
-       if (sym->s_kind == FVFT) {
-               if (sym->s_arg) {
-                       check_argument_usage(novar, sym);
-               } else {
-                       check_variable_usage(novar, sym);
-               }
-       } else if (sym->s_kind == FLABEL) {
+       if (sym->s_kind == FVFT && sym->s_arg)
+               check_argument_usage(novar, sym);
+       else if (sym->s_kind == FVFT)
+               check_variable_usage(novar, sym);
+       else if (sym->s_kind == FLABEL)
                check_label_usage(sym);
-       } else if (sym->s_kind == FTAG) {
+       else if (sym->s_kind == FTAG)
                check_tag_usage(sym);
-       }
-
-       curr_pos = cpos;
 }
 
 static void
@@ -3040,9 +3032,8 @@
                return;
 
        if (!arg->s_used && vflag) {
-               curr_pos = arg->s_def_pos;
                /* argument '%s' unused in function '%s' */
-               warning(231, arg->s_name, funcsym->s_name);
+               warning_at(231, arg->s_def_pos, arg->s_name, funcsym->s_name);
        }
 }
 
@@ -3073,19 +3064,19 @@
 
        if (sc == EXTERN) {
                if (!sym->s_used && !sym->s_set) {
-                       curr_pos = sym->s_def_pos;
                        /* '%s' unused in function '%s' */
-                       warning(192, sym->s_name, funcsym->s_name);
+                       warning_at(192, sym->s_def_pos,
+                           sym->s_name, funcsym->s_name);
                }
        } else {
                if (sym->s_set && !sym->s_used) {
-                       curr_pos = sym->s_set_pos;
                        /* '%s' set but not used in function '%s' */
-                       warning(191, sym->s_name, funcsym->s_name);
+                       warning_at(191, sym->s_set_pos,
+                           sym->s_name, funcsym->s_name);
                } else if (!sym->s_used) {
-                       curr_pos = sym->s_def_pos;
                        /* '%s' unused in function '%s' */
-                       warning(192, sym->s_name, funcsym->s_name);
+                       warning_at(192, sym->s_def_pos,
+                           sym->s_name, funcsym->s_name);
                }
        }
 
@@ -3121,13 +3112,11 @@
        lint_assert(lab->s_block_level == 1);
 
        if (lab->s_set && !lab->s_used) {
-               curr_pos = lab->s_set_pos;
                /* label %s unused in function %s */
-               warning(232, lab->s_name, funcsym->s_name);
+               warning_at(232, lab->s_set_pos, lab->s_name, funcsym->s_name);
        } else if (!lab->s_set) {
-               curr_pos = lab->s_use_pos;
                /* undefined label %s */
-               warning(23, lab->s_name);
+               warning_at(23, lab->s_use_pos, lab->s_name);
        }
 }