[src/trunk]: src/usr.bin/make make(1): don't use bitfields in list processing

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

details:   https://anonhg.NetBSD.org/src/rev/0668b55d4678
branches:  trunk
changeset: 937543:0668b55d4678
user:      rillig <rillig%NetBSD.org@localhost>
date:      Fri Aug 21 03:03:45 2020 +0000

description:
make(1): don't use bitfields in list processing

There is no need to squeeze unrelated fields of the struct into a single
object.  A bitset with a single flag is the same as a simple boolean
variable.

diffstat:

 usr.bin/make/lst.c |  27 +++++++++++++--------------
 1 files changed, 13 insertions(+), 14 deletions(-)

diffs (89 lines):

diff -r 09d7894efeaf -r 0668b55d4678 usr.bin/make/lst.c
--- a/usr.bin/make/lst.c        Fri Aug 21 02:56:25 2020 +0000
+++ b/usr.bin/make/lst.c        Fri Aug 21 03:03:45 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: lst.c,v 1.6 2020/08/21 02:56:25 rillig Exp $ */
+/* $NetBSD: lst.c,v 1.7 2020/08/21 03:03:45 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -36,27 +36,23 @@
 #include "make_malloc.h"
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: lst.c,v 1.6 2020/08/21 02:56:25 rillig Exp $";
+static char rcsid[] = "$NetBSD: lst.c,v 1.7 2020/08/21 03:03:45 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
-__RCSID("$NetBSD: lst.c,v 1.6 2020/08/21 02:56:25 rillig Exp $");
+__RCSID("$NetBSD: lst.c,v 1.7 2020/08/21 03:03:45 rillig Exp $");
 #endif /* not lint */
 #endif
 
 typedef struct ListNode {
     struct ListNode *prevPtr;  /* previous element in list */
     struct ListNode *nextPtr;  /* next in list */
-    unsigned int useCount: 8,  /* Count of functions using the node.
+    uint8_t useCount;          /* Count of functions using the node.
                                 * node may not be deleted until count
                                 * goes to 0 */
-                flags: 8;      /* Node status flags */
+    Boolean deleted;           /* List node should be removed when done */
     void *datum;               /* datum associated with this element */
 } *ListNode;
-/*
- * Flags required for synchronization
- */
-#define LN_DELETED     0x0001  /* List node should be removed when done */
 
 typedef enum {
     Head, Middle, Tail, Unknown
@@ -272,7 +268,8 @@
     PAlloc (nLNode, ListNode);
 
     nLNode->datum = d;
-    nLNode->useCount = nLNode->flags = 0;
+    nLNode->useCount = 0;
+    nLNode->deleted = FALSE;
 
     if (ln == NULL) {
        nLNode->prevPtr = nLNode->nextPtr = NULL;
@@ -336,7 +333,8 @@
 
     PAlloc (nLNode, ListNode);
     nLNode->datum = d;
-    nLNode->useCount = nLNode->flags = 0;
+    nLNode->useCount = 0;
+    nLNode->deleted = FALSE;
 
     if (lNode == NULL) {
        nLNode->nextPtr = nLNode->prevPtr = NULL;
@@ -473,7 +471,7 @@
     if (lNode->useCount == 0) {
        free(ln);
     } else {
-       lNode->flags |= LN_DELETED;
+       lNode->deleted = TRUE;
     }
 
     return SUCCESS;
@@ -793,7 +791,7 @@
            done = 0;
        }
 
-       if (tln->flags & LN_DELETED) {
+       if (tln->deleted) {
            free((char *)tln);
        }
        tln = next;
@@ -884,7 +882,8 @@
                list1->firstPtr = nln;
            }
            nln->prevPtr = last;
-           nln->flags = nln->useCount = 0;
+           nln->useCount = 0;
+           nln->deleted = FALSE;
            last = nln;
        }