re PR middle-end/83859 (Please add new attribute which will establish relation betwee...

	PR middle-end/83859
	* doc/extend.texi (attribute access): Fix a typo.

	* c-attribs.c (append_access_attrs): Avoid buffer overflow.  Avoid
	memory leak.  Use XNEWVEC macro.  Use auto_diagnostic_group to
	group warning with inform together.
	(handle_access_attribute): Formatting fix.

From-SVN: r278641

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 596db034dfe4291bc31aa6d2a37fa030e4d6d76d..e57413167472ebc169ad0f7b5f22a0017c0499b0 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,8 @@
 2019-11-23  Jakub Jelinek  <jakub@redhat.com>
 
+       PR middle-end/83859
+       * doc/extend.texi (attribute access): Fix a typo.
+
        PR rtl-optimization/92610
        * cse.c (rest_of_handle_cse2): Call cleanup_cfg (0) also if
        cse_cfg_altered is set, even when tem is 0.

diff --git a/gcc/c-family/ChangeLog b/gcc/c-family/ChangeLog
index 1cf0fef54655d9b01143c23eaf715b1d613becd5..281d7f409b79a0dbdf70e2a163e0399245c2bc73 100644 (file)
--- a/gcc/c-family/ChangeLog
+++ b/gcc/c-family/ChangeLog
@@ -1,3 +1,11 @@
+2019-11-23  Jakub Jelinek  <jakub@redhat.com>
+
+       PR middle-end/83859
+       * c-attribs.c (append_access_attrs): Avoid buffer overflow.  Avoid
+       memory leak.  Use XNEWVEC macro.  Use auto_diagnostic_group to
+       group warning with inform together.
+       (handle_access_attribute): Formatting fix.
+
 2019-11-22  Jakub Jelinek  <jakub@redhat.com>
 
        PR c/90677

diff --git a/gcc/c-family/c-attribs.c b/gcc/c-family/c-attribs.c
index e307160a4534590712e7193c6bfba68e096a08cb..cc006f3836612761eab756d678e27b390f16605b 100644 (file)
--- a/gcc/c-family/c-attribs.c
+++ b/gcc/c-family/c-attribs.c
@@ -3840,7 +3840,7 @@ append_access_attrs (tree t, tree attrs, const char *attrstr,
   if (idxs[1])
     n2 = sprintf (attrspec + n1 + 1, "%u", (unsigned) idxs[1] - 1);
 
-  size_t newlen = n1 + n2;
+  size_t newlen = n1 + n2 + !!n2;
   char *newspec = attrspec;
 
   if (tree acs = lookup_attribute ("access", attrs))
@@ -3869,6 +3869,7 @@ append_access_attrs (tree t, tree attrs, const char *attrstr,
          if (*attrspec != pos[-1])
            {
              /* Mismatch in access mode.  */
+             auto_diagnostic_group d;
              if (warning (OPT_Wattributes,
                           "attribute %qs mismatch with mode %qs",
                           attrstr,
@@ -3884,6 +3885,7 @@ append_access_attrs (tree t, tree attrs, const char *attrstr,
          if ((n2 && pos[n1 - 1] != ','))
            {
              /* Mismatch in the presence of the size argument.  */
+             auto_diagnostic_group d;
              if (warning (OPT_Wattributes,
                           "attribute %qs positional argument 2 conflicts "
                           "with previous designation",
@@ -3897,6 +3899,7 @@ append_access_attrs (tree t, tree attrs, const char *attrstr,
          if (!n2 && pos[n1 - 1] == ',')
            {
              /* Mismatch in the presence of the size argument.  */
+             auto_diagnostic_group d;
              if (warning (OPT_Wattributes,
                           "attribute %qs missing positional argument 2 "
                           "provided in previous designation",
@@ -3910,6 +3913,7 @@ append_access_attrs (tree t, tree attrs, const char *attrstr,
          if (n2 && strncmp (attrstr + n1 + 1, pos + n1, n2))
            {
              /* Mismatch in the value of the size argument.  */
+             auto_diagnostic_group d;
              if (warning (OPT_Wattributes,
                           "attribute %qs mismatch positional argument "
                           "values %i and %i",
@@ -3929,7 +3933,7 @@ append_access_attrs (tree t, tree attrs, const char *attrstr,
        attrspec[n1] = ',';
 
       size_t len = strlen (str);
-      newspec = (char *) xmalloc (newlen + len + 1);
+      newspec = XNEWVEC (char, newlen + len + 1);
       strcpy (newspec, str);
       strcpy (newspec + len, attrspec);
       newlen += len;
@@ -3938,7 +3942,10 @@ append_access_attrs (tree t, tree attrs, const char *attrstr,
     /* Connect the two substrings formatted above into a single one.  */
     attrspec[n1] = ',';
 
-  return build_string (newlen + 1, newspec);
+  tree ret = build_string (newlen + 1, newspec);
+  if (newspec != attrspec)
+    XDELETEVEC (newspec);
+  return ret;
 }
 
 /* Handle the access attribute (read_only, write_only, and read_write).  */
@@ -4168,7 +4175,8 @@ handle_access_attribute (tree *node, tree name, tree args,
     {
       /* Repeat for the previously declared type.  */
       attrs = TYPE_ATTRIBUTES (TREE_TYPE (node[1]));
-      tree new_attrs = append_access_attrs (node[1], attrs, attrstr, code, idxs);
+      tree new_attrs
+       = append_access_attrs (node[1], attrs, attrstr, code, idxs);
       if (!new_attrs)
        return NULL_TREE;
 

diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 3a63d48f857aa2bc93241d8c943c77546b474d21..56a3d60a947293940c27a22cd4547ff059e37431 100644 (file)
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -2490,7 +2490,7 @@ The following attributes are supported on most targets.
 
 The @code{access} attribute enables the detection of invalid or unsafe
 accesses by functions to which they apply to or their callers, as well
-as wite-only accesses to objects that are never read from.  Such accesses
+as write-only accesses to objects that are never read from.  Such accesses
 may be diagnosed by warnings such as @option{-Wstringop-overflow},
 @option{-Wunnitialized}, @option{-Wunused}, and others.