author | zgu |
Fri, 25 Jan 2013 10:04:08 -0500 | |
changeset 15432 | 9d976ca484d8 |
parent 13728 | 882756847a04 |
child 17113 | 5928fcab633d |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2012, 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 "memory/allocation.hpp" |
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// ReservedSpace is a data structure for reserving a contiguous address range. |
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class ReservedSpace VALUE_OBJ_CLASS_SPEC { |
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friend class VMStructs; |
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private: |
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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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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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void initialize(size_t size, size_t alignment, bool large, |
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char* requested_address, |
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const size_t noaccess_prefix, |
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bool executable); |
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// Release parts of an already-reserved memory region [addr, addr + len) to |
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// get a new region that has "compound alignment." Return the start of the |
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// resulting region, or NULL on failure. |
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// |
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// The region is logically divided into a prefix and a suffix. The prefix |
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// starts at the result address, which is aligned to prefix_align. The suffix |
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// starts at result address + prefix_size, which is aligned to suffix_align. |
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// The total size of the result region is size prefix_size + suffix_size. |
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char* align_reserved_region(char* addr, const size_t len, |
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const size_t prefix_size, |
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const size_t prefix_align, |
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const size_t suffix_size, |
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const size_t suffix_align); |
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// Reserve memory, call align_reserved_region() to alignment it and return the |
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// result. |
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char* reserve_and_align(const size_t reserve_size, |
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const size_t prefix_size, |
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const size_t prefix_align, |
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const size_t suffix_size, |
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const size_t suffix_align); |
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protected: |
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// Create protection page at the beginning of the space. |
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void protect_noaccess_prefix(const size_t size); |
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public: |
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// Constructor |
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ReservedSpace(size_t size); |
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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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const size_t noaccess_prefix = 0); |
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ReservedSpace(const size_t suffix_size, const size_t suffix_align, |
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char* requested_address, |
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const size_t noaccess_prefix = 0); |
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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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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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}; |
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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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public: |
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// Constructor |
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ReservedHeapSpace(size_t size, size_t forced_base_alignment, |
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bool large, char* requested_address); |
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ReservedHeapSpace(const size_t prefix_size, const size_t prefix_align, |
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char* requested_address); |
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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 VALUE_OBJ_CLASS_SPEC { |
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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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public: |
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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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bool special() const { return _special; } |
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public: |
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// Initialization |
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VirtualSpace(); |
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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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// Testers (all sizes are byte sizes) |
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size_t committed_size() const; |
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size_t reserved_size() const; |
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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() PRODUCT_RETURN; |
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}; |
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#endif // SHARE_VM_RUNTIME_VIRTUALSPACE_HPP |