8080511: Refresh of jimage support

Co-authored-by: James Laskey <james.laskey@oracle.com>
Co-authored-by: Sundararajan Athijegannathan <sundararajan.athijegannathan@oracle.com>
Reviewed-by: alanb, mchung, psandoz, acorn, lfoltan, ctornqvi

hotspot/src/share/vm/utilities/endian.cpp

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "utilities/endian.hpp"
+#include "utilities/bytes.hpp"
+
+#ifndef bswap_16
+extern "C" inline u2 bswap_16(u2 x) {
+  return ((x & 0xFF) << 8) |
+         ((x >> 8) & 0xFF);
+}
+#endif
+
+#ifndef bswap_32
+extern "C" inline u4 bswap_32(u4 x) {
+  return ((x & 0xFF) << 24) |
+       ((x & 0xFF00) << 8) |
+       ((x >> 8) & 0xFF00) |
+       ((x >> 24) & 0xFF);
+}
+#endif
+
+#ifndef bswap_64
+extern "C" inline u8 bswap_64(u8 x) {
+  return (u8)bswap_32((u4)x) << 32 |
+         (u8)bswap_32((u4)(x >> 32));
+}
+#endif
+
+u2 NativeEndian::get(u2 x) { return x; }
+u4 NativeEndian::get(u4 x) { return x; }
+u8 NativeEndian::get(u8 x) { return x; }
+s2 NativeEndian::get(s2 x) { return x; }
+s4 NativeEndian::get(s4 x) { return x; }
+s8 NativeEndian::get(s8 x) { return x; }
+
+void NativeEndian::set(u2& x, u2 y) { x = y; }
+void NativeEndian::set(u4& x, u4 y) { x = y; }
+void NativeEndian::set(u8& x, u8 y) { x = y; }
+void NativeEndian::set(s2& x, s2 y) { x = y; }
+void NativeEndian::set(s4& x, s4 y) { x = y; }
+void NativeEndian::set(s8& x, s8 y) { x = y; }
+
+NativeEndian NativeEndian::_native;
+
+u2 SwappingEndian::get(u2 x) { return bswap_16(x); }
+u4 SwappingEndian::get(u4 x) { return bswap_32(x); }
+u8 SwappingEndian::get(u8 x) { return bswap_64(x); }
+s2 SwappingEndian::get(s2 x) { return bswap_16(x); }
+s4 SwappingEndian::get(s4 x) { return bswap_32(x); }
+s8 SwappingEndian::get(s8 x) { return bswap_64(x); }
+
+void SwappingEndian::set(u2& x, u2 y) { x = bswap_16(y); }
+void SwappingEndian::set(u4& x, u4 y) { x = bswap_32(y); }
+void SwappingEndian::set(u8& x, u8 y) { x = bswap_64(y); }
+void SwappingEndian::set(s2& x, s2 y) { x = bswap_16(y); }
+void SwappingEndian::set(s4& x, s4 y) { x = bswap_32(y); }
+void SwappingEndian::set(s8& x, s8 y) { x = bswap_64(y); }
+
+SwappingEndian SwappingEndian::_swapping;
+
+Endian* Endian::get_handler(bool big_endian) {
+  // If requesting little endian on a little endian machine or
+  // big endian on a big endian machine use native handler
+  if (big_endian == is_big_endian()) {
+    return NativeEndian::get_native();
+  } else {
+    // Use swapping handler.
+    return SwappingEndian::get_swapping();
+  }
+}
+
+Endian* Endian::get_native_handler() {
+  return NativeEndian::get_native();
+}