author | jwilhelm |
Thu, 03 Oct 2013 21:36:29 +0200 | |
changeset 20398 | b206c580c45f |
parent 20083 | df032615dd00 |
child 22553 | 12b903843ee2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1BIASEDARRAY_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1BIASEDARRAY_HPP |
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#include "utilities/debug.hpp" |
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#include "memory/allocation.inline.hpp" |
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// Implements the common base functionality for arrays that contain provisions |
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// for accessing its elements using a biased index. |
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// The element type is defined by the instantiating the template. |
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class G1BiasedMappedArrayBase VALUE_OBJ_CLASS_SPEC { |
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friend class VMStructs; |
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public: |
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typedef size_t idx_t; |
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protected: |
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address _base; // the real base address |
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size_t _length; // the length of the array |
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address _biased_base; // base address biased by "bias" elements |
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size_t _bias; // the bias, i.e. the offset biased_base is located to the right in elements |
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uint _shift_by; // the amount of bits to shift right when mapping to an index of the array. |
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|
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protected: |
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G1BiasedMappedArrayBase() : _base(NULL), _length(0), _biased_base(NULL), |
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_bias(0), _shift_by(0) { } |
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// Allocate a new array, generic version. |
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static address create_new_base_array(size_t length, size_t elem_size) { |
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assert(length > 0, "just checking"); |
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assert(elem_size > 0, "just checking"); |
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return NEW_C_HEAP_ARRAY(u_char, length * elem_size, mtGC); |
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} |
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// Initialize the members of this class. The biased start address of this array |
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// is the bias (in elements) multiplied by the element size. |
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void initialize_base(address base, size_t length, size_t bias, size_t elem_size, uint shift_by) { |
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assert(base != NULL, "just checking"); |
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assert(length > 0, "just checking"); |
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assert(shift_by < sizeof(uintptr_t) * 8, err_msg("Shifting by %zd, larger than word size?", shift_by)); |
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_base = base; |
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_length = length; |
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_biased_base = base - (bias * elem_size); |
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_bias = bias; |
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_shift_by = shift_by; |
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} |
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// Allocate and initialize this array to cover the heap addresses in the range |
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// of [bottom, end). |
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void initialize(HeapWord* bottom, HeapWord* end, size_t target_elem_size_in_bytes, size_t mapping_granularity_in_bytes) { |
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assert(mapping_granularity_in_bytes > 0, "just checking"); |
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assert(is_power_of_2(mapping_granularity_in_bytes), |
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err_msg("mapping granularity must be power of 2, is %zd", mapping_granularity_in_bytes)); |
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assert((uintptr_t)bottom % mapping_granularity_in_bytes == 0, |
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err_msg("bottom mapping area address must be a multiple of mapping granularity %zd, is "PTR_FORMAT, |
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mapping_granularity_in_bytes, bottom)); |
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assert((uintptr_t)end % mapping_granularity_in_bytes == 0, |
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err_msg("end mapping area address must be a multiple of mapping granularity %zd, is "PTR_FORMAT, |
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mapping_granularity_in_bytes, end)); |
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size_t num_target_elems = (end - bottom) / (mapping_granularity_in_bytes / HeapWordSize); |
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idx_t bias = (uintptr_t)bottom / mapping_granularity_in_bytes; |
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address base = create_new_base_array(num_target_elems, target_elem_size_in_bytes); |
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initialize_base(base, num_target_elems, bias, target_elem_size_in_bytes, log2_intptr(mapping_granularity_in_bytes)); |
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} |
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size_t bias() const { return _bias; } |
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uint shift_by() const { return _shift_by; } |
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void verify_index(idx_t index) const PRODUCT_RETURN; |
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void verify_biased_index(idx_t biased_index) const PRODUCT_RETURN; |
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void verify_biased_index_inclusive_end(idx_t biased_index) const PRODUCT_RETURN; |
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public: |
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// Return the length of the array in elements. |
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size_t length() const { return _length; } |
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}; |
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// Array that provides biased access and mapping from (valid) addresses in the |
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// heap into this array. |
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template<class T> |
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class G1BiasedMappedArray : public G1BiasedMappedArrayBase { |
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public: |
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typedef G1BiasedMappedArrayBase::idx_t idx_t; |
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T* base() const { return (T*)G1BiasedMappedArrayBase::_base; } |
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// Return the element of the given array at the given index. Assume |
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// the index is valid. This is a convenience method that does sanity |
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// checking on the index. |
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T get_by_index(idx_t index) const { |
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verify_index(index); |
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return this->base()[index]; |
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} |
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// Set the element of the given array at the given index to the |
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// given value. Assume the index is valid. This is a convenience |
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// method that does sanity checking on the index. |
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void set_by_index(idx_t index, T value) { |
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verify_index(index); |
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this->base()[index] = value; |
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} |
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// The raw biased base pointer. |
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T* biased_base() const { return (T*)G1BiasedMappedArrayBase::_biased_base; } |
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// Return the element of the given array that covers the given word in the |
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// heap. Assumes the index is valid. |
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T get_by_address(HeapWord* value) const { |
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idx_t biased_index = ((uintptr_t)value) >> this->shift_by(); |
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this->verify_biased_index(biased_index); |
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return biased_base()[biased_index]; |
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} |
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// Set the value of the array entry that corresponds to the given array. |
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void set_by_address(HeapWord * address, T value) { |
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idx_t biased_index = ((uintptr_t)address) >> this->shift_by(); |
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this->verify_biased_index(biased_index); |
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biased_base()[biased_index] = value; |
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} |
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|
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protected: |
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// Returns the address of the element the given address maps to |
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T* address_mapped_to(HeapWord* address) { |
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idx_t biased_index = ((uintptr_t)address) >> this->shift_by(); |
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this->verify_biased_index_inclusive_end(biased_index); |
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return biased_base() + biased_index; |
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} |
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|
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public: |
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// Return the smallest address (inclusive) in the heap that this array covers. |
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HeapWord* bottom_address_mapped() const { |
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return (HeapWord*) ((uintptr_t)this->bias() << this->shift_by()); |
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} |
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// Return the highest address (exclusive) in the heap that this array covers. |
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HeapWord* end_address_mapped() const { |
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return (HeapWord*) ((uintptr_t)(this->bias() + this->length()) << this->shift_by()); |
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} |
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protected: |
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virtual T default_value() const = 0; |
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// Set all elements of the given array to the given value. |
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void clear() { |
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T value = default_value(); |
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for (idx_t i = 0; i < length(); i++) { |
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set_by_index(i, value); |
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} |
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} |
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public: |
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G1BiasedMappedArray() {} |
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|
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// Allocate and initialize this array to cover the heap addresses in the range |
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// of [bottom, end). |
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void initialize(HeapWord* bottom, HeapWord* end, size_t mapping_granularity) { |
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G1BiasedMappedArrayBase::initialize(bottom, end, sizeof(T), mapping_granularity); |
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this->clear(); |
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} |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1BIASEDARRAY_HPP |