author | redestad |
Thu, 20 Dec 2018 19:44:08 +0100 | |
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/* |
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* Copyright (c) 1997, 2018, 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_RUNTIME_VIRTUALSPACE_HPP |
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#define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP |
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#include "utilities/globalDefinitions.hpp" |
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// ReservedSpace is a data structure for reserving a contiguous address range. |
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class ReservedSpace { |
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friend class VMStructs; |
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protected: |
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char* _base; |
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size_t _size; |
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size_t _noaccess_prefix; |
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size_t _alignment; |
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bool _special; |
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int _fd_for_heap; |
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private: |
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bool _executable; |
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// ReservedSpace |
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ReservedSpace(char* base, size_t size, size_t alignment, bool special, |
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bool executable); |
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protected: |
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void initialize(size_t size, size_t alignment, bool large, |
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char* requested_address, |
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bool executable); |
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public: |
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// Constructor |
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ReservedSpace(); |
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// Initialize the reserved space with the given size. If preferred_page_size |
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// is set, use this as minimum page size/alignment. This may waste some space |
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// if the given size is not aligned to that value, as the reservation will be |
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// aligned up to the final alignment in this case. |
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ReservedSpace(size_t size, size_t preferred_page_size = 0); |
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ReservedSpace(size_t size, size_t alignment, bool large, |
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char* requested_address = NULL); |
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ReservedSpace(size_t size, size_t alignment, bool large, bool executable); |
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// Accessors |
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char* base() const { return _base; } |
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size_t size() const { return _size; } |
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char* end() const { return _base + _size; } |
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size_t alignment() const { return _alignment; } |
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bool special() const { return _special; } |
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bool executable() const { return _executable; } |
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size_t noaccess_prefix() const { return _noaccess_prefix; } |
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bool is_reserved() const { return _base != NULL; } |
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void release(); |
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// Splitting |
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ReservedSpace first_part(size_t partition_size, size_t alignment, |
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bool split = false, bool realloc = true); |
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ReservedSpace last_part (size_t partition_size, size_t alignment); |
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// These simply call the above using the default alignment. |
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inline ReservedSpace first_part(size_t partition_size, |
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bool split = false, bool realloc = true); |
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inline ReservedSpace last_part (size_t partition_size); |
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// Alignment |
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static size_t page_align_size_up(size_t size); |
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static size_t page_align_size_down(size_t size); |
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static size_t allocation_align_size_up(size_t size); |
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static size_t allocation_align_size_down(size_t size); |
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bool contains(const void* p) const { |
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return (base() <= ((char*)p)) && (((char*)p) < (base() + size())); |
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} |
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}; |
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ReservedSpace |
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ReservedSpace::first_part(size_t partition_size, bool split, bool realloc) |
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{ |
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return first_part(partition_size, alignment(), split, realloc); |
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} |
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ReservedSpace ReservedSpace::last_part(size_t partition_size) |
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{ |
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return last_part(partition_size, alignment()); |
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} |
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// Class encapsulating behavior specific of memory space reserved for Java heap. |
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class ReservedHeapSpace : public ReservedSpace { |
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private: |
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void try_reserve_heap(size_t size, size_t alignment, bool large, |
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char *requested_address); |
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void try_reserve_range(char *highest_start, char *lowest_start, |
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size_t attach_point_alignment, char *aligned_HBMA, |
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char *upper_bound, size_t size, size_t alignment, bool large); |
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void initialize_compressed_heap(const size_t size, size_t alignment, bool large); |
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// Create protection page at the beginning of the space. |
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void establish_noaccess_prefix(); |
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public: |
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// Constructor. Tries to find a heap that is good for compressed oops. |
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// heap_allocation_directory is the path to the backing memory for Java heap. When set, Java heap will be allocated |
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// on the device which is managed by the file system where the directory resides. |
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ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large, const char* heap_allocation_directory = NULL); |
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// Returns the base to be used for compression, i.e. so that null can be |
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// encoded safely and implicit null checks can work. |
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char *compressed_oop_base() { return _base - _noaccess_prefix; } |
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}; |
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// Class encapsulating behavior specific memory space for Code |
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class ReservedCodeSpace : public ReservedSpace { |
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public: |
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// Constructor |
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ReservedCodeSpace(size_t r_size, size_t rs_align, bool large); |
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}; |
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// VirtualSpace is data structure for committing a previously reserved address range in smaller chunks. |
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class VirtualSpace { |
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friend class VMStructs; |
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private: |
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// Reserved area |
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char* _low_boundary; |
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char* _high_boundary; |
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// Committed area |
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char* _low; |
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char* _high; |
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// The entire space has been committed and pinned in memory, no |
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// os::commit_memory() or os::uncommit_memory(). |
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bool _special; |
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// Need to know if commit should be executable. |
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bool _executable; |
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// MPSS Support |
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// Each virtualspace region has a lower, middle, and upper region. |
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// Each region has an end boundary and a high pointer which is the |
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// high water mark for the last allocated byte. |
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// The lower and upper unaligned to LargePageSizeInBytes uses default page. |
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// size. The middle region uses large page size. |
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char* _lower_high; |
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char* _middle_high; |
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char* _upper_high; |
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char* _lower_high_boundary; |
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char* _middle_high_boundary; |
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char* _upper_high_boundary; |
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size_t _lower_alignment; |
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size_t _middle_alignment; |
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size_t _upper_alignment; |
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// MPSS Accessors |
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char* lower_high() const { return _lower_high; } |
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char* middle_high() const { return _middle_high; } |
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char* upper_high() const { return _upper_high; } |
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char* lower_high_boundary() const { return _lower_high_boundary; } |
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char* middle_high_boundary() const { return _middle_high_boundary; } |
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char* upper_high_boundary() const { return _upper_high_boundary; } |
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size_t lower_alignment() const { return _lower_alignment; } |
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size_t middle_alignment() const { return _middle_alignment; } |
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size_t upper_alignment() const { return _upper_alignment; } |
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// Committed area |
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char* low() const { return _low; } |
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char* high() const { return _high; } |
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// Reserved area |
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char* low_boundary() const { return _low_boundary; } |
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char* high_boundary() const { return _high_boundary; } |
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// Set boundaries for code section in AOT library. |
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void set_low_boundary(char *p) { _low_boundary = p; } |
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void set_high_boundary(char *p) { _high_boundary = p; } |
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void set_low(char *p) { _low = p; } |
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void set_high(char *p) { _high = p; } |
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#endif |
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bool special() const { return _special; } |
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// Initialization |
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VirtualSpace(); |
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bool initialize_with_granularity(ReservedSpace rs, size_t committed_byte_size, size_t max_commit_ganularity); |
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bool initialize(ReservedSpace rs, size_t committed_byte_size); |
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// Destruction |
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~VirtualSpace(); |
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// Reserved memory |
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size_t reserved_size() const; |
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// Actually committed OS memory |
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size_t actual_committed_size() const; |
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// Memory used/expanded in this virtual space |
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size_t committed_size() const; |
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// Memory left to use/expand in this virtual space |
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size_t uncommitted_size() const; |
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bool contains(const void* p) const; |
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// Operations |
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// returns true on success, false otherwise |
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bool expand_by(size_t bytes, bool pre_touch = false); |
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void shrink_by(size_t bytes); |
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void release(); |
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void check_for_contiguity() PRODUCT_RETURN; |
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// Debugging |
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void print_on(outputStream* out) PRODUCT_RETURN; |
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void print(); |
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}; |
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#endif // SHARE_VM_RUNTIME_VIRTUALSPACE_HPP |