X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=src%2Flibpspp%2Fcompiler.h;h=c99220ee748f443ee2f8ba1d15ef09d2a56352dd;hb=164d1274fcb70c54897f2a03fc7c27152ed4821a;hp=8c2c3abd2ea6a808761eed046dce287f277ffaf9;hpb=028d89f9437e8fb25fd3fd67bcdd158819ce8557;p=pspp-builds.git

diff --git a/src/libpspp/compiler.h b/src/libpspp/compiler.h
index 8c2c3abd..c99220ee 100644
--- a/src/libpspp/compiler.h
+++ b/src/libpspp/compiler.h
@@ -1,6 +1,5 @@
 /* PSPP - computes sample statistics.
    Copyright (C) 2006 Free Software Foundation, Inc.
-   Written by Ben Pfaff <blp@gnu.org>.
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
@@ -32,12 +31,21 @@
 #define ATTRIBUTE(X)
 #endif
 
+/* Marks a function argument as possibly not used. */
 #define UNUSED ATTRIBUTE ((unused))
+
+/* Marks a function that will never return. */
 #define NO_RETURN ATTRIBUTE ((noreturn))
+
+/* Mark a function as taking a printf- or scanf-like format
+   string as its FMT'th argument and that the FIRST'th argument
+   is the first one to be checked against the format string. */
 #define PRINTF_FORMAT(FMT, FIRST) ATTRIBUTE ((format (printf, FMT, FIRST)))
 #define SCANF_FORMAT(FMT, FIRST) ATTRIBUTE ((format (scanf, FMT, FIRST)))
 
-/* This attribute was added late in the GCC 2.x cycle. */
+/* Tells the compiler that a function may be treated as if any
+   non-`NULL' pointer it returns cannot alias any other pointer
+   valid when the function returns. */
 #if __GNUC__ > 2
 #define MALLOC_LIKE ATTRIBUTE ((malloc))
 #else
@@ -51,4 +59,24 @@
 #define WARN_UNUSED_RESULT
 #endif
 
+/* This attribute indicates that the function does not examine
+   any values except its arguments, and has no effects except the
+   return value.  A function that has pointer arguments and
+   examines the data pointed to must _not_ be declared
+   `const'.  */
+#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5)
+#define CONST_FUNCTION ATTRIBUTE ((const))
+#else
+#define CONST_FUNCTION
+#endif
+
+/* This attribute indicates that the function has no effects
+   except the return value and its return value depends only on
+   the parameters and/or global variables. */
+#if __GNUC__ > 2
+#define PURE_FUNCTION ATTRIBUTE ((pure))
+#else
+#define PURE_FUNCTION
+#endif
+
 #endif /* compiler.h */