Add alloc_size for libiberty memory allocation functions.

2019-06-10  Martin Liska  <mliska@suse.cz>

	* ansidecl.h:
	(ATTRIBUTE_RESULT_SIZE_1): Define new macro.
	(ATTRIBUTE_RESULT_SIZE_2): Likewise.
	(ATTRIBUTE_RESULT_SIZE_1_2): Likewise.
	* libiberty.h (xmalloc): Add RESULT_SIZE attribute.
	(xrealloc): Likewise.
	(xcalloc): Likewise.

From-SVN: r272109

include/ChangeLog

+2019-06-10  Martin Liska  <mliska@suse.cz>
+
+	* ansidecl.h:
+	(ATTRIBUTE_RESULT_SIZE_1): Define new macro.
+	(ATTRIBUTE_RESULT_SIZE_2): Likewise.
+	(ATTRIBUTE_RESULT_SIZE_1_2): Likewise.
+	* libiberty.h (xmalloc): Add RESULT_SIZE attribute.
+	(xrealloc): Likewise.
+	(xcalloc): Likewise.
+
 2019-04-26  Michael Forney  <mforney@mforney.org>
 
 	* libiberty.h (vasprintf): Don't declare if HAVE_DECL_VASPRINTF

include/ansidecl.h

@@ -292,6 +292,31 @@ So instead we use the macro below and test it against specific values.  */
 # endif
 #endif
 
+/* Attribute `alloc_size' was valid as of gcc 4.3.  */
+#ifndef ATTRIBUTE_RESULT_SIZE_1
+# if (GCC_VERSION >= 4003)
+#  define ATTRIBUTE_RESULT_SIZE_1 __attribute__ ((alloc_size (1)))
+# else
+#  define ATTRIBUTE_RESULT_SIZE_1
+#endif
+#endif
+
+#ifndef ATTRIBUTE_RESULT_SIZE_2
+# if (GCC_VERSION >= 4003)
+#  define ATTRIBUTE_RESULT_SIZE_2 __attribute__ ((alloc_size (2)))
+# else
+#  define ATTRIBUTE_RESULT_SIZE_2
+#endif
+#endif
+
+#ifndef ATTRIBUTE_RESULT_SIZE_1_2
+# if (GCC_VERSION >= 4003)
+#  define ATTRIBUTE_RESULT_SIZE_1_2 __attribute__ ((alloc_size (1, 2)))
+# else
+#  define ATTRIBUTE_RESULT_SIZE_1_2
+#endif
+#endif
+
 /* We use __extension__ in some places to suppress -pedantic warnings
    about GCC extensions.  This feature didn't work properly before
    gcc 2.8.  */

include/libiberty.h

@@ -310,18 +310,18 @@ extern void xmalloc_failed (size_t) ATTRIBUTE_NORETURN;
    message to stderr (using the name set by xmalloc_set_program_name,
    if any) and then call xexit.  */
 
-extern void *xmalloc (size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
+extern void *xmalloc (size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_RESULT_SIZE_1;
 
 /* Reallocate memory without fail.  This works like xmalloc.  Note,
    realloc type functions are not suitable for attribute malloc since
    they may return the same address across multiple calls. */
 
-extern void *xrealloc (void *, size_t) ATTRIBUTE_RETURNS_NONNULL;
+extern void *xrealloc (void *, size_t) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_RESULT_SIZE_2;
 
 /* Allocate memory without fail and set it to zero.  This works like
    xmalloc.  */
 
-extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
+extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_RESULT_SIZE_1_2;
 
 /* Copy a string into a memory buffer without fail.  */