configure.ac: add a generic --enable-debug, replace --enable-hashmap-debug

There will be more debugging options later.
 --enable-debug will enable them all.
 --enable-debug=hashmap will enable only hashmap debugging.

Also rename the C #define to ENABLE_DEBUG_* pattern.

configure.ac

@@ -1323,16 +1323,33 @@ AS_IF([test "x$0" != "x./configure"], [
 ])
 
 AC_ARG_ENABLE(tests,
-       [AC_HELP_STRING([--disable-tests], [disable tests])],
-       enable_tests=$enableval, enable_tests=yes)
+        [AC_HELP_STRING([--disable-tests], [disable tests])],
+        enable_tests=$enableval, enable_tests=yes)
 AM_CONDITIONAL(ENABLE_TESTS, [test x$enable_tests = xyes])
 
-AC_ARG_ENABLE(hashmap-debug,
-       [AC_HELP_STRING([--enable-hashmap-debug], [enable hashmap debugging])],
-       enable_hashmap_debug=$enableval, enable_hashmap_debug=no)
-AS_IF([test x$enable_hashmap_debug = xyes], [
-        AC_DEFINE(ENABLE_HASHMAP_DEBUG, 1, [Define if hashmap debugging is to be enabled])
+AC_ARG_ENABLE(debug,
+        [AC_HELP_STRING([--enable-debug@<:@=LIST@:>@], [enable extra debugging (hashmap)])],
+        [if test "x$enableval" = "xyes"; then
+                enableval="hashmap"
+        fi
+        saved_ifs="$IFS"
+        IFS="$IFS$PATH_SEPARATOR,"
+        for name in $enableval; do
+                case $name in
+                hashmap)
+                        enable_debug_hashmap=yes
+                        ;;
+                esac
+        done
+        IFS="$saved_ifs"],[])
+
+enable_debug=""
+AS_IF([test x$enable_debug_hashmap = xyes], [
+        AC_DEFINE(ENABLE_DEBUG_HASHMAP, 1, [Define if hashmap debugging is to be enabled])
+        enable_debug="hashmap $enable_debug"
 ])
+])
+test -z "$enable_debug" && enable_debug="none"
 
 AC_SUBST([dbuspolicydir], [$with_dbuspolicydir])
 AC_SUBST([dbussessionservicedir], [$with_dbussessionservicedir])
@@ -1419,6 +1436,7 @@ AC_MSG_RESULT([
         SysV compatibility:      ${SYSTEM_SYSV_COMPAT}
         compatibility libraries: ${have_compat_libs}
         utmp/wtmp support:       ${have_utmp}
+        extra debugging:         ${enable_debug}
 
         prefix:                  ${prefix}
         rootprefix:              ${with_rootprefix}

src/shared/hashmap.c

@@ -137,7 +137,7 @@ typedef uint8_t dib_raw_t;
 
 #define DIB_FREE UINT_MAX
 
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
 struct hashmap_debug_info {
         LIST_FIELDS(struct hashmap_debug_info, debug_list);
         unsigned max_entries;  /* high watermark of n_entries */
@@ -158,9 +158,9 @@ static LIST_HEAD(struct hashmap_debug_info, hashmap_debug_list);
 
 #define HASHMAP_DEBUG_FIELDS struct hashmap_debug_info debug;
 
-#else /* !ENABLE_HASHMAP_DEBUG */
+#else /* !ENABLE_DEBUG_HASHMAP */
 #define HASHMAP_DEBUG_FIELDS
-#endif /* ENABLE_HASHMAP_DEBUG */
+#endif /* ENABLE_DEBUG_HASHMAP */
 
 enum HashmapType {
         HASHMAP_TYPE_PLAIN,
@@ -552,7 +552,7 @@ static void base_remove_entry(HashmapBase *h, unsigned idx) {
         dibs = dib_raw_ptr(h);
         assert(dibs[idx] != DIB_RAW_FREE);
 
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
         h->debug.rem_count++;
         h->debug.last_rem_idx = idx;
 #endif
@@ -631,7 +631,7 @@ static unsigned hashmap_iterate_in_insertion_order(OrderedHashmap *h, Iterator *
                 assert(e->p.b.key == i->next_key);
         }
 
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
         i->prev_idx = idx;
 #endif
 
@@ -688,7 +688,7 @@ static unsigned hashmap_iterate_in_internal_order(HashmapBase *h, Iterator *i) {
         }
 
         idx = i->idx;
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
         i->prev_idx = idx;
 #endif
 
@@ -711,7 +711,7 @@ static unsigned hashmap_iterate_entry(HashmapBase *h, Iterator *i) {
                 return IDX_NIL;
         }
 
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
         if (i->idx == IDX_FIRST) {
                 i->put_count = h->debug.put_count;
                 i->rem_count = h->debug.rem_count;
@@ -799,7 +799,7 @@ static struct HashmapBase *hashmap_base_new(const struct hash_ops *hash_ops, enu
                 shared_hash_key_initialized= true;
         }
 
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
         LIST_PREPEND(debug_list, hashmap_debug_list, &h->debug);
         h->debug.func = func;
         h->debug.file = file;
@@ -854,7 +854,7 @@ static void hashmap_free_no_clear(HashmapBase *h) {
         assert(!h->has_indirect);
         assert(!h->n_direct_entries);
 
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
         LIST_REMOVE(debug_list, hashmap_debug_list, &h->debug);
 #endif
 
@@ -961,7 +961,7 @@ static bool hashmap_put_robin_hood(HashmapBase *h, unsigned idx,
         dib_raw_t raw_dib, *dibs;
         unsigned dib, distance;
 
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
         h->debug.put_count++;
 #endif
 
@@ -1055,7 +1055,7 @@ static int hashmap_base_put_boldly(HashmapBase *h, unsigned idx,
         assert_se(hashmap_put_robin_hood(h, idx, swap) == false);
 
         n_entries_inc(h);
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
         h->debug.max_entries = MAX(h->debug.max_entries, n_entries(h));
 #endif
 
@@ -1283,7 +1283,7 @@ int hashmap_replace(Hashmap *h, const void *key, void *value) {
         idx = bucket_scan(h, hash, key);
         if (idx != IDX_NIL) {
                 e = plain_bucket_at(h, idx);
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
                 /* Although the key is equal, the key pointer may have changed,
                  * and this would break our assumption for iterating. So count
                  * this operation as incompatible with iteration. */

src/shared/hashmap.h

@@ -32,7 +32,7 @@
  * will be treated as empty hashmap for all read operations. That way it is not
  * necessary to instantiate an object for each Hashmap use.
  *
- * If ENABLE_HASHMAP_DEBUG is defined (by configuring with --enable-hashmap-debug),
+ * If ENABLE_DEBUG_HASHMAP is defined (by configuring with --enable-debug=hashmap),
  * the implemention will:
  * - store extra data for debugging and statistics (see tools/gdb-sd_dump_hashmaps.py)
  * - perform extra checks for invalid use of iterators
@@ -57,7 +57,7 @@ typedef struct Set Set;                       /* Stores just keys */
 typedef struct {
         unsigned idx;         /* index of an entry to be iterated next */
         const void *next_key; /* expected value of that entry's key pointer */
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
         unsigned put_count;   /* hashmap's put_count recorded at start of iteration */
         unsigned rem_count;   /* hashmap's rem_count in previous iteration */
         unsigned prev_idx;    /* idx in previous iteration */
@@ -129,7 +129,7 @@ extern const struct hash_ops devt_hash_ops = {
                 (Hashmap*)(h), \
                 (void)0)
 
-#ifdef ENABLE_HASHMAP_DEBUG
+#ifdef ENABLE_DEBUG_HASHMAP
 # define HASHMAP_DEBUG_PARAMS , const char *func, const char *file, int line
 # define HASHMAP_DEBUG_SRC_ARGS   , __func__, __FILE__, __LINE__
 # define HASHMAP_DEBUG_PASS_ARGS   , func, file, line