jdk8-mips64-public/hotspot: src/share/vm/oops/klass.inline.hpp@b8413a9cbb84

8031752: Failed speculative optimizations should be reattempted when root of compilation is different
Summary: support for speculative traps that keep track of the root of the compilation in which a trap occurs.
Reviewed-by: kvn, twisti

     1 /*

     2  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     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

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_OOPS_KLASS_INLINE_HPP

    26 #define SHARE_VM_OOPS_KLASS_INLINE_HPP

    28 #include "memory/universe.hpp"

    29 #include "oops/klass.hpp"

    30 #include "oops/markOop.hpp"

    32 inline void Klass::set_prototype_header(markOop header) {

    33   assert(!header->has_bias_pattern() || oop_is_instance(), "biased locking currently only supported for Java instances");

    34   _prototype_header = header;

    35 }

    37 inline bool Klass::is_null(Klass* obj)  { return obj == NULL; }

    38 inline bool Klass::is_null(narrowKlass obj) { return obj == 0; }

    40 // Encoding and decoding for klass field.

    42 inline bool check_klass_alignment(Klass* obj) {

    43   return (intptr_t)obj % KlassAlignmentInBytes == 0;

    44 }

    46 inline narrowKlass Klass::encode_klass_not_null(Klass* v) {

    47   assert(!is_null(v), "klass value can never be zero");

    48   assert(check_klass_alignment(v), "Address not aligned");

    49   int    shift = Universe::narrow_klass_shift();

    50   uint64_t pd = (uint64_t)(pointer_delta((void*)v, Universe::narrow_klass_base(), 1));

    51   assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding");

    52   uint64_t result = pd >> shift;

    53   assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow");

    54   assert(decode_klass(result) == v, "reversibility");

    55   return (narrowKlass)result;

    56 }

    58 inline narrowKlass Klass::encode_klass(Klass* v) {

    59   return is_null(v) ? (narrowKlass)0 : encode_klass_not_null(v);

    60 }

    62 inline Klass* Klass::decode_klass_not_null(narrowKlass v) {

    63   assert(!is_null(v), "narrow klass value can never be zero");

    64   int    shift = Universe::narrow_klass_shift();

    65   Klass* result = (Klass*)(void*)((uintptr_t)Universe::narrow_klass_base() + ((uintptr_t)v << shift));

    66   assert(check_klass_alignment(result), err_msg("address not aligned: " PTR_FORMAT, (void*) result));

    67   return result;

    68 }

    70 inline Klass* Klass::decode_klass(narrowKlass v) {

    71   return is_null(v) ? (Klass*)NULL : decode_klass_not_null(v);

    72 }

    74 #endif // SHARE_VM_OOPS_KLASS_INLINE_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/oops/klass.inline.hpp@b8413a9cbb84

src/share/vm/oops/klass.inline.hpp