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comparison src/share/vm/oops/oop.inline.hpp @ 7982:10d5f25a7c67

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8000968: NPG: UseCompressedKlassPointers asserts with ObjectAlignmentInBytes for > 32G CompressedOops Summary: Pick a base that works for both CompressedOpps alignment and CompressedKlassPtrs alignment. Reviewed-by: kvn, roland
author hseigel
date Mon, 04 Feb 2013 08:26:02 -0500
parents 8e47bac5643a
children 3c9bc17b9403
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7981:ce5467120c84 7982:10d5f25a7c67
1 /* 1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
225 225
226 // Encoding and decoding for klass field. It is copied code, but someday 226 // Encoding and decoding for klass field. It is copied code, but someday
227 // might not be the same as oop. 227 // might not be the same as oop.
228 228
229 inline narrowOop oopDesc::encode_klass_not_null(Klass* v) { 229 inline narrowOop oopDesc::encode_klass_not_null(Klass* v) {
230 assert(!is_null(v), "oop value can never be zero"); 230 assert(!is_null(v), "klass value can never be zero");
231 assert(check_klass_alignment(v), "Address not aligned"); 231 assert(check_klass_alignment(v), "Address not aligned");
232 address base = Universe::narrow_klass_base(); 232 address base = Universe::narrow_klass_base();
233 int shift = Universe::narrow_klass_shift(); 233 int shift = Universe::narrow_klass_shift();
234 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1)); 234 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1));
235 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding"); 235 assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding");
236 uint64_t result = pd >> shift; 236 uint64_t result = pd >> shift;
237 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow"); 237 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow");
238 assert(decode_klass(result) == v, "reversibility"); 238 assert(decode_klass(result) == v, "reversibility");
239 return (narrowOop)result; 239 return (narrowOop)result;
240 } 240 }