duke@435: /* trims@1907: * Copyright (c) 2003, 2009, Oracle and/or its affiliates. All rights reserved. duke@435: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. duke@435: * duke@435: * This code is free software; you can redistribute it and/or modify it duke@435: * under the terms of the GNU General Public License version 2 only, as duke@435: * published by the Free Software Foundation. duke@435: * duke@435: * This code is distributed in the hope that it will be useful, but WITHOUT duke@435: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or duke@435: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License duke@435: * version 2 for more details (a copy is included in the LICENSE file that duke@435: * accompanied this code). duke@435: * duke@435: * You should have received a copy of the GNU General Public License version duke@435: * 2 along with this work; if not, write to the Free Software Foundation, duke@435: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. duke@435: * trims@1907: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA trims@1907: * or visit www.oracle.com if you need additional information or have any trims@1907: * questions. duke@435: * duke@435: */ duke@435: duke@435: // VirtualSpace for the parallel scavenge collector. duke@435: // duke@435: // VirtualSpace is data structure for committing a previously reserved address duke@435: // range in smaller chunks. duke@435: duke@435: class PSVirtualSpace : public CHeapObj { duke@435: friend class VMStructs; duke@435: protected: duke@435: // The space is committed/uncommited in chunks of size _alignment. The duke@435: // ReservedSpace passed to initialize() must be aligned to this value. duke@435: const size_t _alignment; duke@435: duke@435: // Reserved area duke@435: char* _reserved_low_addr; duke@435: char* _reserved_high_addr; duke@435: duke@435: // Committed area duke@435: char* _committed_low_addr; duke@435: char* _committed_high_addr; duke@435: duke@435: // The entire space has been committed and pinned in memory, no duke@435: // os::commit_memory() or os::uncommit_memory(). duke@435: bool _special; duke@435: duke@435: // Convenience wrapper. duke@435: inline static size_t pointer_delta(const char* left, const char* right); duke@435: duke@435: public: duke@435: PSVirtualSpace(ReservedSpace rs, size_t alignment); duke@435: PSVirtualSpace(ReservedSpace rs); duke@435: duke@435: ~PSVirtualSpace(); duke@435: duke@435: // Eventually all instances should be created with the above 1- or 2-arg duke@435: // constructors. Then the 1st constructor below should become protected and duke@435: // the 2nd ctor and initialize() removed. duke@435: PSVirtualSpace(size_t alignment): _alignment(alignment) { } duke@435: PSVirtualSpace(); duke@435: bool initialize(ReservedSpace rs, size_t commit_size); duke@435: duke@435: bool contains(void* p) const; duke@435: duke@435: // Accessors (all sizes are bytes). duke@435: size_t alignment() const { return _alignment; } duke@435: char* reserved_low_addr() const { return _reserved_low_addr; } duke@435: char* reserved_high_addr() const { return _reserved_high_addr; } duke@435: char* committed_low_addr() const { return _committed_low_addr; } duke@435: char* committed_high_addr() const { return _committed_high_addr; } duke@435: bool special() const { return _special; } duke@435: duke@435: inline size_t committed_size() const; duke@435: inline size_t reserved_size() const; duke@435: inline size_t uncommitted_size() const; duke@435: duke@435: // Operations. duke@435: inline void set_reserved(char* low_addr, char* high_addr, bool special); duke@435: inline void set_reserved(ReservedSpace rs); duke@435: inline void set_committed(char* low_addr, char* high_addr); iveresov@970: virtual bool expand_by(size_t bytes); duke@435: virtual bool shrink_by(size_t bytes); duke@435: virtual size_t expand_into(PSVirtualSpace* space, size_t bytes); duke@435: void release(); duke@435: duke@435: #ifndef PRODUCT duke@435: // Debugging duke@435: static bool is_aligned(size_t val, size_t align); duke@435: bool is_aligned(size_t val) const; duke@435: bool is_aligned(char* val) const; duke@435: void verify() const; duke@435: void print() const; duke@435: virtual bool grows_up() const { return true; } duke@435: bool grows_down() const { return !grows_up(); } duke@435: duke@435: // Helper class to verify a space when entering/leaving a block. duke@435: class PSVirtualSpaceVerifier: public StackObj { duke@435: private: duke@435: const PSVirtualSpace* const _space; duke@435: public: duke@435: PSVirtualSpaceVerifier(PSVirtualSpace* space): _space(space) { duke@435: _space->verify(); duke@435: } duke@435: ~PSVirtualSpaceVerifier() { _space->verify(); } duke@435: }; duke@435: #endif duke@435: duke@435: virtual void print_space_boundaries_on(outputStream* st) const; duke@435: duke@435: // Included for compatibility with the original VirtualSpace. duke@435: public: duke@435: // Committed area duke@435: char* low() const { return committed_low_addr(); } duke@435: char* high() const { return committed_high_addr(); } duke@435: duke@435: // Reserved area duke@435: char* low_boundary() const { return reserved_low_addr(); } duke@435: char* high_boundary() const { return reserved_high_addr(); } duke@435: }; duke@435: duke@435: // A virtual space that grows from high addresses to low addresses. duke@435: class PSVirtualSpaceHighToLow : public PSVirtualSpace { duke@435: friend class VMStructs; duke@435: public: duke@435: PSVirtualSpaceHighToLow(ReservedSpace rs, size_t alignment); duke@435: PSVirtualSpaceHighToLow(ReservedSpace rs); duke@435: iveresov@970: virtual bool expand_by(size_t bytes); duke@435: virtual bool shrink_by(size_t bytes); duke@435: virtual size_t expand_into(PSVirtualSpace* space, size_t bytes); duke@435: duke@435: virtual void print_space_boundaries_on(outputStream* st) const; duke@435: duke@435: #ifndef PRODUCT duke@435: // Debugging duke@435: virtual bool grows_up() const { return false; } duke@435: #endif duke@435: }; duke@435: duke@435: // duke@435: // PSVirtualSpace inlines. duke@435: // duke@435: inline size_t duke@435: PSVirtualSpace::pointer_delta(const char* left, const char* right) { duke@435: return ::pointer_delta((void *)left, (void*)right, sizeof(char)); duke@435: } duke@435: duke@435: inline size_t PSVirtualSpace::committed_size() const { duke@435: return pointer_delta(committed_high_addr(), committed_low_addr()); duke@435: } duke@435: duke@435: inline size_t PSVirtualSpace::reserved_size() const { duke@435: return pointer_delta(reserved_high_addr(), reserved_low_addr()); duke@435: } duke@435: duke@435: inline size_t PSVirtualSpace::uncommitted_size() const { duke@435: return reserved_size() - committed_size(); duke@435: } duke@435: duke@435: inline void PSVirtualSpace::set_reserved(char* low_addr, char* high_addr, bool special) { duke@435: _reserved_low_addr = low_addr; duke@435: _reserved_high_addr = high_addr; duke@435: _special = special; duke@435: } duke@435: duke@435: inline void PSVirtualSpace::set_reserved(ReservedSpace rs) { duke@435: set_reserved(rs.base(), rs.base() + rs.size(), rs.special()); duke@435: } duke@435: duke@435: inline void PSVirtualSpace::set_committed(char* low_addr, char* high_addr) { duke@435: _committed_low_addr = low_addr; duke@435: _committed_high_addr = high_addr; duke@435: }