author | coleenp |
Sun, 13 Apr 2008 17:43:42 -0400 | |
changeset 360 | 21d113ecbf6a |
parent 202 | dc13bf0e5d5d |
child 591 | 04d2e26e6d69 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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// arrayOopDesc is the abstract baseclass for all arrays. It doesn't |
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// declare pure virtual to enforce this because that would allocate a vtbl |
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// in each instance, which we don't want. |
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// The layout of array Oops is: |
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// |
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// markOop |
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// klassOop // 32 bits if compressed but declared 64 in LP64. |
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// length // shares klass memory or allocated after declared fields. |
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class arrayOopDesc : public oopDesc { |
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friend class VMStructs; |
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// Interpreter/Compiler offsets |
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// Header size computation. |
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// The header is considered the oop part of this type plus the length. |
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// Returns the aligned header_size_in_bytes. This is not equivalent to |
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// sizeof(arrayOopDesc) which should not appear in the code, except here. |
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static int header_size_in_bytes() { |
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size_t hs = UseCompressedOops ? |
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sizeof(arrayOopDesc) : |
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align_size_up(sizeof(arrayOopDesc) + sizeof(int), HeapWordSize); |
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#ifdef ASSERT |
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// make sure it isn't called before UseCompressedOops is initialized. |
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static size_t arrayoopdesc_hs = 0; |
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if (arrayoopdesc_hs == 0) arrayoopdesc_hs = hs; |
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assert(arrayoopdesc_hs == hs, "header size can't change"); |
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#endif // ASSERT |
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return (int)hs; |
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} |
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public: |
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// The _length field is not declared in C++. It is allocated after the |
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// declared nonstatic fields in arrayOopDesc if not compressed, otherwise |
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// it occupies the second half of the _klass field in oopDesc. |
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static int length_offset_in_bytes() { |
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return UseCompressedOops ? klass_gap_offset_in_bytes() : |
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sizeof(arrayOopDesc); |
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} |
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// Returns the offset of the first element. |
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static int base_offset_in_bytes(BasicType type) { |
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return header_size(type) * HeapWordSize; |
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} |
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// Returns the address of the first element. |
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void* base(BasicType type) const { |
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return (void*) (((intptr_t) this) + base_offset_in_bytes(type)); |
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} |
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// Tells whether index is within bounds. |
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bool is_within_bounds(int index) const { return 0 <= index && index < length(); } |
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// Accessors for instance variable which is not a C++ declared nonstatic |
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// field. |
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int length() const { |
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return *(int*)(((intptr_t)this) + length_offset_in_bytes()); |
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} |
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void set_length(int length) { |
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*(int*)(((intptr_t)this) + length_offset_in_bytes()) = length; |
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} |
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// Should only be called with constants as argument |
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// (will not constant fold otherwise) |
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// Returns the header size in words aligned to the requirements of the |
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// array object type. |
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static int header_size(BasicType type) { |
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size_t typesize_in_bytes = header_size_in_bytes(); |
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return (int)(Universe::element_type_should_be_aligned(type) |
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? align_object_size(typesize_in_bytes/HeapWordSize) |
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: typesize_in_bytes/HeapWordSize); |
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} |
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// This method returns the maximum length that can passed into |
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// typeArrayOop::object_size(scale, length, header_size) without causing an |
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// overflow. We substract an extra 2*wordSize to guard against double word |
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// alignments. It gets the scale from the type2aelembytes array. |
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static int32_t max_array_length(BasicType type) { |
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assert(type >= 0 && type < T_CONFLICT, "wrong type"); |
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assert(type2aelembytes(type) != 0, "wrong type"); |
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// We use max_jint, since object_size is internally represented by an 'int' |
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// This gives us an upper bound of max_jint words for the size of the oop. |
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int32_t max_words = (max_jint - header_size(type) - 2); |
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int elembytes = type2aelembytes(type); |
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jlong len = ((jlong)max_words * HeapWordSize) / elembytes; |
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return (len > max_jint) ? max_jint : (int32_t)len; |
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} |
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}; |