basic-block.h (ENTRY_BLOCK, EXIT_BLOCK): Document that neither of them is…

basic-block.h (ENTRY_BLOCK, EXIT_BLOCK): Document that neither of them is supposed to hold actual statements.

2009-06-07  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>

	* basic-block.h (ENTRY_BLOCK, EXIT_BLOCK): Document that neither of
	them is supposed to hold actual statements.

From-SVN: r148256

gcc/ChangeLog

+2009-06-07  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>
+
+	* basic-block.h (ENTRY_BLOCK, EXIT_BLOCK): Document that neither of
+	them is supposed to hold actual statements.
+
 2009-06-06  Ian Lance Taylor  <iant@google.com>
 
 	* doc/extend.texi (Attribute Syntax): Document that C++ labels on

gcc/basic-block.h

@@ -491,7 +491,8 @@ extern bitmap_obstack reg_obstack;
 #define BB_HEAD(B)      (B)->il.rtl->head_
 #define BB_END(B)       (B)->il.rtl->end_
 
-/* Special block numbers [markers] for entry and exit.  */
+/* Special block numbers [markers] for entry and exit.
+   Neither of them is supposed to hold actual statements.  */
 #define ENTRY_BLOCK (0)
 #define EXIT_BLOCK (1)