[src/trunk]: src/usr.bin/xlint/lint1 lint: in DEBUG mode, verify printf param...

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

details:   https://anonhg.NetBSD.org/src/rev/02deaec0fde8
branches:  trunk
changeset: 949168:02deaec0fde8
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Jan 03 18:48:37 2021 +0000

description:
lint: in DEBUG mode, verify printf parameters for messages

Since several years GCC validates printf-style strings, and there is no
reason not to let GCC do that work.  This prevents bugs like the
segmentation fault that was fixed in tree.c 1.109 from 2021-01-01.

By default, lint is compiled with DEBUG off, but it's easy enough to
compile it in debug mode once in a while.

diffstat:

 usr.bin/xlint/lint1/Makefile            |   4 +++-
 usr.bin/xlint/lint1/Makefile.err-msgs-h |  13 +++++++++++++
 usr.bin/xlint/lint1/decl.c              |   6 +++---
 usr.bin/xlint/lint1/err.c               |  14 +++++++-------
 usr.bin/xlint/lint1/lint1.h             |  26 +++++++++++++++++++++++++-
 5 files changed, 51 insertions(+), 12 deletions(-)

diffs (172 lines):

diff -r b42e27efe436 -r 02deaec0fde8 usr.bin/xlint/lint1/Makefile
--- a/usr.bin/xlint/lint1/Makefile      Sun Jan 03 18:35:51 2021 +0000
+++ b/usr.bin/xlint/lint1/Makefile      Sun Jan 03 18:48:37 2021 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile,v 1.54 2021/01/01 14:51:44 rillig Exp $
+#      $NetBSD: Makefile,v 1.55 2021/01/03 18:48:37 rillig Exp $
 
 .include <bsd.own.mk>
 
@@ -38,9 +38,11 @@
 DPADD+=                ${LIBL}
 .endif
 
+.include "Makefile.err-msgs-h"
 .include "Makefile.ops-h"
 .include "Makefile.ops-c"
 
 .include <bsd.prog.mk>
 
 ${SRCS}: ops.h
+${SRCS:Nerr.c}: err-msgs.h
diff -r b42e27efe436 -r 02deaec0fde8 usr.bin/xlint/lint1/Makefile.err-msgs-h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/usr.bin/xlint/lint1/Makefile.err-msgs-h   Sun Jan 03 18:48:37 2021 +0000
@@ -0,0 +1,13 @@
+#      $NetBSD: Makefile.err-msgs-h,v 1.1 2021/01/03 18:48:37 rillig Exp $
+
+err-msgs.h: err.c Makefile.err-msgs-h
+       ${_MKTARGET_CREATE}
+       sp='[[:space:]]*'; \
+       from="^$$sp\(\".*\"\)\,$$sp/\*$$sp\([0-9][0-9]*\)$$sp\*/\$$"; \
+       ${TOOL_SED} -n -e "s,$$from,#define MSG_\2 \1,p" < err.c > ${.TARGET}.tmp
+       mv -f ${.TARGET}.tmp ${.TARGET}
+
+CLEANFILES+=   err-msgs.h
+DPSRCS+=       err-msgs.h
+
+externs1.h: err-msgs.h
diff -r b42e27efe436 -r 02deaec0fde8 usr.bin/xlint/lint1/decl.c
--- a/usr.bin/xlint/lint1/decl.c        Sun Jan 03 18:35:51 2021 +0000
+++ b/usr.bin/xlint/lint1/decl.c        Sun Jan 03 18:48:37 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: decl.c,v 1.106 2021/01/03 17:42:45 rillig Exp $ */
+/* $NetBSD: decl.c,v 1.107 2021/01/03 18:48:37 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 1.106 2021/01/03 17:42:45 rillig Exp $");
+__RCSID("$NetBSD: decl.c,v 1.107 2021/01/03 18:48:37 rillig Exp $");
 #endif
 
 #include <sys/param.h>
@@ -3206,7 +3206,7 @@
        cpos = curr_pos;
        curr_pos = psym->s_def_pos;
        if (msg != -1) {
-               message(msg);
+               (message)(msg);
        } else if (psym->s_def == DEF || psym->s_def == TDEF) {
                /* previous definition of %s */
                message(261, psym->s_name);
diff -r b42e27efe436 -r 02deaec0fde8 usr.bin/xlint/lint1/err.c
--- a/usr.bin/xlint/lint1/err.c Sun Jan 03 18:35:51 2021 +0000
+++ b/usr.bin/xlint/lint1/err.c Sun Jan 03 18:48:37 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: err.c,v 1.63 2021/01/03 17:42:45 rillig Exp $  */
+/*     $NetBSD: err.c,v 1.64 2021/01/03 18:48:37 rillig Exp $  */
 
 /*
  * Copyright (c) 1994, 1995 Jochen Pohl
@@ -37,7 +37,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: err.c,v 1.63 2021/01/03 17:42:45 rillig Exp $");
+__RCSID("$NetBSD: err.c,v 1.64 2021/01/03 18:48:37 rillig Exp $");
 #endif
 
 #include <sys/types.h>
@@ -464,7 +464,7 @@
 }
 
 void
-error(int n, ...)
+(error)(int n, ...)
 {
        va_list ap;
 
@@ -502,7 +502,7 @@
 }
 
 void
-warning(int n, ...)
+(warning)(int n, ...)
 {
        va_list ap;
 
@@ -512,7 +512,7 @@
 }
 
 void
-message(int n, ...)
+(message)(int n, ...)
 {
        va_list ap;
        const   char *fn;
@@ -535,7 +535,7 @@
  * "right"... [perry, 2 Nov 2002]
 */
 void
-c99ism(int n, ...)
+(c99ism)(int n, ...)
 {
        va_list ap;
        bool extensions_ok = Sflag || gflag;
@@ -550,7 +550,7 @@
 }
 
 void
-gnuism(int n, ...)
+(gnuism)(int n, ...)
 {
        va_list ap;
 
diff -r b42e27efe436 -r 02deaec0fde8 usr.bin/xlint/lint1/lint1.h
--- a/usr.bin/xlint/lint1/lint1.h       Sun Jan 03 18:35:51 2021 +0000
+++ b/usr.bin/xlint/lint1/lint1.h       Sun Jan 03 18:48:37 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: lint1.h,v 1.48 2021/01/02 18:26:44 rillig Exp $ */
+/* $NetBSD: lint1.h,v 1.49 2021/01/03 18:48:37 rillig Exp $ */
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All Rights Reserved.
@@ -33,6 +33,7 @@
  */
 
 #include "lint.h"
+#include "err-msgs.h"
 #include "op.h"
 
 /*
@@ -435,3 +436,26 @@
 #endif
 
 extern err_set msgset;
+
+
+#ifdef DEBUG
+#  include "err-msgs.h"
+
+/* ARGSUSED */
+static inline void __attribute__((format(printf, 1, 2)))
+check_printf(const char *fmt, ...)
+{
+}
+
+#  define wrap_check_printf(func, id, args...)                         \
+       do {                                                            \
+               check_printf(__CONCAT(MSG_, id), ##args);               \
+               (func)(id, ##args);                                     \
+       } while (/*CONSTCOND*/0)
+
+#  define error(id, args...) wrap_check_printf(error, id, ##args)
+#  define warning(id, args...) wrap_check_printf(warning, id, ##args)
+#  define message(id, args...) wrap_check_printf(message, id, ##args)
+#  define gnuism(id, args...) wrap_check_printf(gnuism, id, ##args)
+#  define c99ism(id, args...) wrap_check_printf(c99ism, id, ##args)
+#endif