[src/trunk]: src/usr.bin/xlint/lint1 lint: extract main part of case_label in...

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

details:   https://anonhg.NetBSD.org/src/rev/61c155f96d9e
branches:  trunk
changeset: 1017590:61c155f96d9e
user:      rillig <rillig%NetBSD.org@localhost>
date:      Fri Jan 01 11:01:03 2021 +0000

description:
lint: extract main part of case_label into separate function

diffstat:

 usr.bin/xlint/lint1/func.c |  145 +++++++++++++++++++++++---------------------
 1 files changed, 77 insertions(+), 68 deletions(-)

diffs (176 lines):

diff -r 8936899781e2 -r 61c155f96d9e usr.bin/xlint/lint1/func.c
--- a/usr.bin/xlint/lint1/func.c        Fri Jan 01 10:55:27 2021 +0000
+++ b/usr.bin/xlint/lint1/func.c        Fri Jan 01 11:01:03 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: func.c,v 1.42 2021/01/01 10:55:28 rillig Exp $ */
+/*     $NetBSD: func.c,v 1.43 2021/01/01 11:01:03 rillig Exp $ */
 
 /*
  * Copyright (c) 1994, 1995 Jochen Pohl
@@ -37,7 +37,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: func.c,v 1.42 2021/01/01 10:55:28 rillig Exp $");
+__RCSID("$NetBSD: func.c,v 1.43 2021/01/01 11:01:03 rillig Exp $");
 #endif
 
 #include <stdlib.h>
@@ -413,82 +413,91 @@
        reached = 1;
 }
 
+static void
+check_case_label(tnode_t *tn, cstk_t *ci)
+{
+       clst_t  *cl;
+       val_t   *v;
+       val_t   nv;
+       tspec_t t;
+
+       if (ci == NULL) {
+               /* case not in switch */
+               error(195);
+               return;
+       }
+
+       if (tn != NULL && tn->tn_op != CON) {
+               /* non-constant case expression */
+               error(197);
+               return;
+       }
+
+       if (tn != NULL && !tspec_is_int(tn->tn_type->t_tspec)) {
+               /* non-integral case expression */
+               error(198);
+               return;
+       }
+
+       lint_assert(ci->c_swtype != NULL);
+
+       if (reached && !ftflg) {
+               if (hflag)
+                       /* fallthrough on case statement */
+                       warning(220);
+       }
+
+       t = tn->tn_type->t_tspec;
+       if (t == LONG || t == ULONG ||
+           t == QUAD || t == UQUAD) {
+               if (tflag)
+                       /* case label must be of type ... */
+                       warning(203);
+       }
+
+       /*
+        * get the value of the expression and convert it
+        * to the type of the switch expression
+        */
+       v = constant(tn, 1);
+       (void) memset(&nv, 0, sizeof nv);
+       cvtcon(CASE, 0, ci->c_swtype, &nv, v);
+       free(v);
+
+       /* look if we had this value already */
+       for (cl = ci->c_clst; cl != NULL; cl = cl->cl_next) {
+               if (cl->cl_val.v_quad == nv.v_quad)
+                       break;
+       }
+       if (cl != NULL && tspec_is_uint(nv.v_tspec)) {
+               /* duplicate case in switch: %lu */
+               error(200, (u_long)nv.v_quad);
+       } else if (cl != NULL) {
+               /* duplicate case in switch: %ld */
+               error(199, (long)nv.v_quad);
+       } else {
+               /*
+                * append the value to the list of
+                * case values
+                */
+               cl = xcalloc(1, sizeof (clst_t));
+               cl->cl_val = nv;
+               cl->cl_next = ci->c_clst;
+               ci->c_clst = cl;
+       }
+}
+
 void
 case_label(tnode_t *tn)
 {
        cstk_t  *ci;
-       clst_t  *cl;
-       val_t   *v;
-       val_t   nv;
-       tspec_t t;
 
        /* find the stack entry for the innermost switch statement */
        for (ci = cstk; ci != NULL && !ci->c_switch; ci = ci->c_next)
                continue;
 
-       if (ci == NULL) {
-               /* case not in switch */
-               error(195);
-               tn = NULL;
-       } else if (tn != NULL && tn->tn_op != CON) {
-               /* non-constant case expression */
-               error(197);
-               tn = NULL;
-       } else if (tn != NULL && !tspec_is_int(tn->tn_type->t_tspec)) {
-               /* non-integral case expression */
-               error(198);
-               tn = NULL;
-       }
-
-       if (tn != NULL) {
-
-               lint_assert(ci->c_swtype != NULL);
-
-               if (reached && !ftflg) {
-                       if (hflag)
-                               /* fallthrough on case statement */
-                               warning(220);
-               }
-
-               t = tn->tn_type->t_tspec;
-               if (t == LONG || t == ULONG ||
-                   t == QUAD || t == UQUAD) {
-                       if (tflag)
-                               /* case label must be of type ... */
-                               warning(203);
-               }
+       check_case_label(tn, ci);
 
-               /*
-                * get the value of the expression and convert it
-                * to the type of the switch expression
-                */
-               v = constant(tn, 1);
-               (void) memset(&nv, 0, sizeof nv);
-               cvtcon(CASE, 0, ci->c_swtype, &nv, v);
-               free(v);
-
-               /* look if we had this value already */
-               for (cl = ci->c_clst; cl != NULL; cl = cl->cl_next) {
-                       if (cl->cl_val.v_quad == nv.v_quad)
-                               break;
-               }
-               if (cl != NULL && tspec_is_uint(nv.v_tspec)) {
-                       /* duplicate case in switch: %lu */
-                       error(200, (u_long)nv.v_quad);
-               } else if (cl != NULL) {
-                       /* duplicate case in switch: %ld */
-                       error(199, (long)nv.v_quad);
-               } else {
-                       /*
-                        * append the value to the list of
-                        * case values
-                        */
-                       cl = xcalloc(1, sizeof (clst_t));
-                       cl->cl_val = nv;
-                       cl->cl_next = ci->c_clst;
-                       ci->c_clst = cl;
-               }
-       }
        tfreeblk();
 
        reached = 1;