truffle: src/share/vm/oops/arrayOop.hpp annotate

annotate src/share/vm/oops/arrayOop.hpp @ 3917:eca1193ca245

4965777: GC changes to support use of discovered field for pending references Summary: If and when the reference handler thread is able to use the discovered field to link reference objects in its pending list, so will GC. In that case, GC will scan through this field once a reference object has been placed on the pending list, but not scan that field before that stage, as the field is used by the concurrent GC thread to link discovered objects. When ReferenceHandleR thread does not use the discovered field for the purpose of linking the elements in the pending list, as would be the case in older JDKs, the JVM will fall back to the old behaviour of using the next field for that purpose. Reviewed-by: jcoomes, mchung, stefank

author	ysr
date	Wed, 07 Sep 2011 13:55:42 -0700
parents	f95d63e2154a
children	6fd81579526f

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1579 diff changeset	2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 579 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 579 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 579 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1579 diff changeset	25 #ifndef SHARE_VM_OOPS_ARRAYOOP_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1579 diff changeset	26 #define SHARE_VM_OOPS_ARRAYOOP_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1579 diff changeset	27
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1579 diff changeset	28 #include "memory/universe.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1579 diff changeset	29 #include "oops/oop.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1579 diff changeset	30
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	31 // arrayOopDesc is the abstract baseclass for all arrays. It doesn't
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	32 // declare pure virtual to enforce this because that would allocate a vtbl
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	33 // in each instance, which we don't want.
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	34
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	35 // The layout of array Oops is:
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	36 //
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	37 // markOop
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	38 // klassOop // 32 bits if compressed but declared 64 in LP64.
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	39 // length // shares klass memory or allocated after declared fields.
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	40
0 a61af66fc99e Initial load duke parents: diff changeset	41
a61af66fc99e Initial load duke parents: diff changeset	42 class arrayOopDesc : public oopDesc {
a61af66fc99e Initial load duke parents: diff changeset	43 friend class VMStructs;
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	44
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	45 // Interpreter/Compiler offsets
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	46
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	47 // Header size computation.
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	48 // The header is considered the oop part of this type plus the length.
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	49 // Returns the aligned header_size_in_bytes. This is not equivalent to
165 437d03ea40b1 6703888: Compressed Oops: use the 32-bits gap after klass in a object kvn parents: 113 diff changeset	50 // sizeof(arrayOopDesc) which should not appear in the code.
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	51 static int header_size_in_bytes() {
165 437d03ea40b1 6703888: Compressed Oops: use the 32-bits gap after klass in a object kvn parents: 113 diff changeset	52 size_t hs = align_size_up(length_offset_in_bytes() + sizeof(int),
437d03ea40b1 6703888: Compressed Oops: use the 32-bits gap after klass in a object kvn parents: 113 diff changeset	53 HeapWordSize);
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	54 #ifdef ASSERT
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	55 // make sure it isn't called before UseCompressedOops is initialized.
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	56 static size_t arrayoopdesc_hs = 0;
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	57 if (arrayoopdesc_hs == 0) arrayoopdesc_hs = hs;
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	58 assert(arrayoopdesc_hs == hs, "header size can't change");
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	59 #endif // ASSERT
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	60 return (int)hs;
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	61 }
0 a61af66fc99e Initial load duke parents: diff changeset	62
a61af66fc99e Initial load duke parents: diff changeset	63 public:
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	64 // The _length field is not declared in C++. It is allocated after the
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	65 // declared nonstatic fields in arrayOopDesc if not compressed, otherwise
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	66 // it occupies the second half of the _klass field in oopDesc.
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	67 static int length_offset_in_bytes() {
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	68 return UseCompressedOops ? klass_gap_offset_in_bytes() :
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	69 sizeof(arrayOopDesc);
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	70 }
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	71
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	72 // Returns the offset of the first element.
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	73 static int base_offset_in_bytes(BasicType type) {
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	74 return header_size(type) * HeapWordSize;
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	75 }
0 a61af66fc99e Initial load duke parents: diff changeset	76
a61af66fc99e Initial load duke parents: diff changeset	77 // Returns the address of the first element.
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	78 void* base(BasicType type) const {
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	79 return (void*) (((intptr_t) this) + base_offset_in_bytes(type));
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	80 }
0 a61af66fc99e Initial load duke parents: diff changeset	81
a61af66fc99e Initial load duke parents: diff changeset	82 // Tells whether index is within bounds.
a61af66fc99e Initial load duke parents: diff changeset	83 bool is_within_bounds(int index) const { return 0 <= index && index < length(); }
a61af66fc99e Initial load duke parents: diff changeset	84
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	85 // Accessors for instance variable which is not a C++ declared nonstatic
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	86 // field.
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	87 int length() const {
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	88 return (int)(((intptr_t)this) + length_offset_in_bytes());
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	89 }
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	90 void set_length(int length) {
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	91 (int)(((intptr_t)this) + length_offset_in_bytes()) = length;
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	92 }
0 a61af66fc99e Initial load duke parents: diff changeset	93
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	94 // Should only be called with constants as argument
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	95 // (will not constant fold otherwise)
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	96 // Returns the header size in words aligned to the requirements of the
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	97 // array object type.
0 a61af66fc99e Initial load duke parents: diff changeset	98 static int header_size(BasicType type) {
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	99 size_t typesize_in_bytes = header_size_in_bytes();
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	100 return (int)(Universe::element_type_should_be_aligned(type)
1571 2d127394260e 6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb kvn parents: 579 diff changeset	101 ? align_object_offset(typesize_in_bytes/HeapWordSize)
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 29 diff changeset	102 : typesize_in_bytes/HeapWordSize);
0 a61af66fc99e Initial load duke parents: diff changeset	103 }
a61af66fc99e Initial load duke parents: diff changeset	104
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	105 // Return the maximum length of an array of BasicType. The length can passed
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	106 // to typeArrayOop::object_size(scale, length, header_size) without causing an
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	107 // overflow.
0 a61af66fc99e Initial load duke parents: diff changeset	108 static int32_t max_array_length(BasicType type) {
a61af66fc99e Initial load duke parents: diff changeset	109 assert(type >= 0 && type < T_CONFLICT, "wrong type");
29 d5fc211aea19 6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM kvn parents: 0 diff changeset	110 assert(type2aelembytes(type) != 0, "wrong type");
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	111 const int bytes_per_element = type2aelembytes(type);
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	112 if (bytes_per_element < HeapWordSize) {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	113 return max_jint;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	114 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	115
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	116 const int32_t max_words = align_size_down(max_jint, MinObjAlignment);
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	117 const int32_t max_element_words = max_words - header_size(type);
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	118 const int32_t words_per_element = bytes_per_element >> LogHeapWordSize;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 196 diff changeset	119 return max_element_words / words_per_element;
0 a61af66fc99e Initial load duke parents: diff changeset	120 }
a61af66fc99e Initial load duke parents: diff changeset	121 };
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1579 diff changeset	122
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1579 diff changeset	123 #endif // SHARE_VM_OOPS_ARRAYOOP_HPP

Mercurial > hg > truffle

annotate src/share/vm/oops/arrayOop.hpp @ 3917:eca1193ca245