--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/zero/vm/bytes_zero.hpp Tue Oct 13 12:04:21 2009 -0700
@@ -0,0 +1,164 @@
+/*
+ * Copyright 1997-2002 Sun Microsystems, Inc. All Rights Reserved.
+ * Copyright 2007, 2008, 2009 Red Hat, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+typedef union unaligned {
+ u4 u;
+ u2 us;
+ u8 ul;
+} __attribute__((packed)) unaligned;
+
+class Bytes: AllStatic {
+ public:
+ // Returns true if the byte ordering used by Java is different
+ // from the native byte ordering of the underlying machine.
+ static inline bool is_Java_byte_ordering_different() {
+#ifdef VM_LITTLE_ENDIAN
+ return true;
+#else
+ return false;
+#endif
+ }
+
+ // Efficient reading and writing of unaligned unsigned data in
+ // platform-specific byte ordering.
+ static inline u2 get_native_u2(address p){
+ unaligned *up = (unaligned *) p;
+ return up->us;
+ }
+
+ static inline u4 get_native_u4(address p) {
+ unaligned *up = (unaligned *) p;
+ return up->u;
+ }
+
+ static inline u8 get_native_u8(address p) {
+ unaligned *up = (unaligned *) p;
+ return up->ul;
+ }
+
+ static inline void put_native_u2(address p, u2 x) {
+ unaligned *up = (unaligned *) p;
+ up->us = x;
+ }
+
+ static inline void put_native_u4(address p, u4 x) {
+ unaligned *up = (unaligned *) p;
+ up->u = x;
+ }
+
+ static inline void put_native_u8(address p, u8 x) {
+ unaligned *up = (unaligned *) p;
+ up->ul = x;
+ }
+
+ // Efficient reading and writing of unaligned unsigned data in Java
+ // byte ordering (i.e. big-endian ordering).
+#ifdef VM_LITTLE_ENDIAN
+ // Byte-order reversal is needed
+ static inline u2 get_Java_u2(address p) {
+ return (u2(p[0]) << 8) |
+ (u2(p[1]) );
+ }
+ static inline u4 get_Java_u4(address p) {
+ return (u4(p[0]) << 24) |
+ (u4(p[1]) << 16) |
+ (u4(p[2]) << 8) |
+ (u4(p[3]) );
+ }
+ static inline u8 get_Java_u8(address p) {
+ u4 hi, lo;
+ hi = (u4(p[0]) << 24) |
+ (u4(p[1]) << 16) |
+ (u4(p[2]) << 8) |
+ (u4(p[3]) );
+ lo = (u4(p[4]) << 24) |
+ (u4(p[5]) << 16) |
+ (u4(p[6]) << 8) |
+ (u4(p[7]) );
+ return u8(lo) | (u8(hi) << 32);
+ }
+
+ static inline void put_Java_u2(address p, u2 x) {
+ p[0] = x >> 8;
+ p[1] = x;
+ }
+ static inline void put_Java_u4(address p, u4 x) {
+ p[0] = x >> 24;
+ p[1] = x >> 16;
+ p[2] = x >> 8;
+ p[3] = x;
+ }
+ static inline void put_Java_u8(address p, u8 x) {
+ u4 hi, lo;
+ lo = x;
+ hi = x >> 32;
+ p[0] = hi >> 24;
+ p[1] = hi >> 16;
+ p[2] = hi >> 8;
+ p[3] = hi;
+ p[4] = lo >> 24;
+ p[5] = lo >> 16;
+ p[6] = lo >> 8;
+ p[7] = lo;
+ }
+
+ // Efficient swapping of byte ordering
+ static inline u2 swap_u2(u2 x);
+ static inline u4 swap_u4(u4 x);
+ static inline u8 swap_u8(u8 x);
+#else
+ // No byte-order reversal is needed
+ static inline u2 get_Java_u2(address p) {
+ return get_native_u2(p);
+ }
+ static inline u4 get_Java_u4(address p) {
+ return get_native_u4(p);
+ }
+ static inline u8 get_Java_u8(address p) {
+ return get_native_u8(p);
+ }
+
+ static inline void put_Java_u2(address p, u2 x) {
+ put_native_u2(p, x);
+ }
+ static inline void put_Java_u4(address p, u4 x) {
+ put_native_u4(p, x);
+ }
+ static inline void put_Java_u8(address p, u8 x) {
+ put_native_u8(p, x);
+ }
+
+ // No byte-order reversal is needed
+ static inline u2 swap_u2(u2 x) { return x; }
+ static inline u4 swap_u4(u4 x) { return x; }
+ static inline u8 swap_u8(u8 x) { return x; }
+#endif // VM_LITTLE_ENDIAN
+};
+
+#ifdef VM_LITTLE_ENDIAN
+// The following header contains the implementations of swap_u2,
+// swap_u4, and swap_u8
+#include "incls/_bytes_pd.inline.hpp.incl"
+#endif // VM_LITTLE_ENDIAN