[src/trunk]: src/usr.bin/xlint/lint1 lint: extract typeok_amper from typeok

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

details:   https://anonhg.NetBSD.org/src/rev/2aea52aff03a
branches:  trunk
changeset: 979756:2aea52aff03a
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Jan 09 18:21:08 2021 +0000

description:
lint: extract typeok_amper from typeok

No functional change.

diffstat:

 usr.bin/xlint/lint1/tree.c |  69 ++++++++++++++++++++++++++--------------------
 1 files changed, 39 insertions(+), 30 deletions(-)

diffs (98 lines):

diff -r 658b7ef834e0 -r 2aea52aff03a usr.bin/xlint/lint1/tree.c
--- a/usr.bin/xlint/lint1/tree.c        Sat Jan 09 18:15:14 2021 +0000
+++ b/usr.bin/xlint/lint1/tree.c        Sat Jan 09 18:21:08 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tree.c,v 1.138 2021/01/09 18:15:14 rillig Exp $        */
+/*     $NetBSD: tree.c,v 1.139 2021/01/09 18:21:08 rillig Exp $        */
 
 /*
  * Copyright (c) 1994, 1995 Jochen Pohl
@@ -37,7 +37,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: tree.c,v 1.138 2021/01/09 18:15:14 rillig Exp $");
+__RCSID("$NetBSD: tree.c,v 1.139 2021/01/09 18:21:08 rillig Exp $");
 #endif
 
 #include <float.h>
@@ -709,6 +709,42 @@
        return true;
 }
 
+static bool
+typeok_amper(mod_t *const mp,
+            tnode_t *const ln, type_t *const ltp, tspec_t const lt)
+{
+       if (lt == ARRAY || lt == FUNC) {
+               /* ok, a warning comes later (in build_ampersand()) */
+       } else if (!ln->tn_lvalue) {
+               if (ln->tn_op == CVT && ln->tn_cast &&
+                   ln->tn_left->tn_op == LOAD) {
+                       if (ln->tn_type->t_tspec == PTR)
+                               return true;
+                       /* a cast does not yield an lvalue */
+                       error(163);
+               }
+               /* %soperand of '%s' must be lvalue */
+               error(114, "", mp->m_name);
+               return false;
+       } else if (tspec_is_scalar(lt)) {
+               if (ltp->t_bitfield) {
+                       /* cannot take address of bit-field */
+                       error(112);
+                       return false;
+               }
+       } else if (lt != STRUCT && lt != UNION) {
+               /* unacceptable operand of '%s' */
+               error(111, mp->m_name);
+               return false;
+       }
+       if (ln->tn_op == NAME && ln->tn_sym->s_reg) {
+               /* cannot take address of register %s */
+               error(113, ln->tn_sym->s_name);
+               return false;
+       }
+       return true;
+}
+
 /*
  * Perform most type checks. First the types are checked using
  * the information from modtab[]. After that it is done by hand for
@@ -810,35 +846,8 @@
                        return 0;
                break;
        case AMPER:
-               if (lt == ARRAY || lt == FUNC) {
-                       /* ok, a warning comes later (in build_ampersand()) */
-               } else if (!ln->tn_lvalue) {
-                       if (ln->tn_op == CVT && ln->tn_cast &&
-                           ln->tn_left->tn_op == LOAD) {
-                               if (ln->tn_type->t_tspec == PTR)
-                                       break;
-                               /* a cast does not yield an lvalue */
-                               error(163);
-                       }
-                       /* %soperand of '%s' must be lvalue */
-                       error(114, "", mp->m_name);
+               if (!typeok_amper(mp, ln, ltp, lt))
                        return 0;
-               } else if (tspec_is_scalar(lt)) {
-                       if (ltp->t_bitfield) {
-                               /* cannot take address of bit-field */
-                               error(112);
-                               return 0;
-                       }
-               } else if (lt != STRUCT && lt != UNION) {
-                       /* unacceptable operand of '%s' */
-                       error(111, mp->m_name);
-                       return 0;
-               }
-               if (ln->tn_op == NAME && ln->tn_sym->s_reg) {
-                       /* cannot take address of register %s */
-                       error(113, ln->tn_sym->s_name);
-                       return 0;
-               }
                break;
        case STAR:
                /* until now there were no type checks for this operator */