Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 60 insertions, 0 deletions

diff --git a/REORG.TODO/include/libc-pointer-arith.h b/REORG.TODO/include/libc-pointer-arith.h
new file mode 100644
index 0000000000..715cbc1bbe
--- /dev/null
+++ b/REORG.TODO/include/libc-pointer-arith.h
@@ -0,0 +1,60 @@
+/* Helper macros for pointer arithmetic.
+   Copyright (C) 2012-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _LIBC_POINTER_ARITH_H
+#define _LIBC_POINTER_ARITH_H 1
+
+#include <stdint.h>
+
+/* 1 if 'type' is a pointer type, 0 otherwise.  */
+# define __pointer_type(type) (__builtin_classify_type ((type) 0) == 5)
+
+/* intptr_t if P is true, or T if P is false.  */
+# define __integer_if_pointer_type_sub(T, P) \
+  __typeof__ (*(0 ? (__typeof__ (0 ? (T *) 0 : (void *) (P))) 0 \
+		  : (__typeof__ (0 ? (intptr_t *) 0 : (void *) (!(P)))) 0))
+
+/* intptr_t if EXPR has a pointer type, or the type of EXPR otherwise.  */
+# define __integer_if_pointer_type(expr) \
+  __integer_if_pointer_type_sub(__typeof__ ((__typeof__ (expr)) 0), \
+				__pointer_type (__typeof__ (expr)))
+
+/* Cast an integer or a pointer VAL to integer with proper type.  */
+# define cast_to_integer(val) ((__integer_if_pointer_type (val)) (val))
+
+/* Align a value by rounding down to closest size.
+   e.g. Using size of 4096, we get this behavior:
+	{4095, 4096, 4097} = {0, 4096, 4096}.  */
+#define ALIGN_DOWN(base, size)	((base) & -((__typeof__ (base)) (size)))
+
+/* Align a value by rounding up to closest size.
+   e.g. Using size of 4096, we get this behavior:
+	{4095, 4096, 4097} = {4096, 4096, 8192}.
+
+  Note: The size argument has side effects (expanded multiple times).  */
+#define ALIGN_UP(base, size)	ALIGN_DOWN ((base) + (size) - 1, (size))
+
+/* Same as ALIGN_DOWN(), but automatically casts when base is a pointer.  */
+#define PTR_ALIGN_DOWN(base, size) \
+  ((__typeof__ (base)) ALIGN_DOWN ((uintptr_t) (base), (size)))
+
+/* Same as ALIGN_UP(), but automatically casts when base is a pointer.  */
+#define PTR_ALIGN_UP(base, size) \
+  ((__typeof__ (base)) ALIGN_UP ((uintptr_t) (base), (size)))
+
+#endif