--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/virtualspace.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,190 @@
+/*
+ * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// ReservedSpace is a data structure for reserving a contiguous address range.
+
+class ReservedSpace VALUE_OBJ_CLASS_SPEC {
+ friend class VMStructs;
+ private:
+ char* _base;
+ size_t _size;
+ size_t _alignment;
+ bool _special;
+
+ // ReservedSpace
+ ReservedSpace(char* base, size_t size, size_t alignment, bool special);
+ void initialize(size_t size, size_t alignment, bool large,
+ char* requested_address = NULL);
+
+ // Release parts of an already-reserved memory region [addr, addr + len) to
+ // get a new region that has "compound alignment." Return the start of the
+ // resulting region, or NULL on failure.
+ //
+ // The region is logically divided into a prefix and a suffix. The prefix
+ // starts at the result address, which is aligned to prefix_align. The suffix
+ // starts at result address + prefix_size, which is aligned to suffix_align.
+ // The total size of the result region is size prefix_size + suffix_size.
+ char* align_reserved_region(char* addr, const size_t len,
+ const size_t prefix_size,
+ const size_t prefix_align,
+ const size_t suffix_size,
+ const size_t suffix_align);
+
+ // Reserve memory, call align_reserved_region() to alignment it and return the
+ // result.
+ char* reserve_and_align(const size_t reserve_size,
+ const size_t prefix_size,
+ const size_t prefix_align,
+ const size_t suffix_size,
+ const size_t suffix_align);
+
+ public:
+ // Constructor
+ ReservedSpace(size_t size);
+ ReservedSpace(size_t size, size_t alignment, bool large,
+ char* requested_address = NULL);
+ ReservedSpace(const size_t prefix_size, const size_t prefix_align,
+ const size_t suffix_size, const size_t suffix_align);
+
+ // Accessors
+ char* base() const { return _base; }
+ size_t size() const { return _size; }
+ size_t alignment() const { return _alignment; }
+ bool special() const { return _special; }
+
+ bool is_reserved() const { return _base != NULL; }
+ void release();
+
+ // Splitting
+ ReservedSpace first_part(size_t partition_size, size_t alignment,
+ bool split = false, bool realloc = true);
+ ReservedSpace last_part (size_t partition_size, size_t alignment);
+
+ // These simply call the above using the default alignment.
+ inline ReservedSpace first_part(size_t partition_size,
+ bool split = false, bool realloc = true);
+ inline ReservedSpace last_part (size_t partition_size);
+
+ // Alignment
+ static size_t page_align_size_up(size_t size);
+ static size_t page_align_size_down(size_t size);
+ static size_t allocation_align_size_up(size_t size);
+ static size_t allocation_align_size_down(size_t size);
+};
+
+ReservedSpace
+ReservedSpace::first_part(size_t partition_size, bool split, bool realloc)
+{
+ return first_part(partition_size, alignment(), split, realloc);
+}
+
+ReservedSpace ReservedSpace::last_part(size_t partition_size)
+{
+ return last_part(partition_size, alignment());
+}
+
+// VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
+
+class VirtualSpace VALUE_OBJ_CLASS_SPEC {
+ friend class VMStructs;
+ private:
+ // Reserved area
+ char* _low_boundary;
+ char* _high_boundary;
+
+ // Committed area
+ char* _low;
+ char* _high;
+
+ // The entire space has been committed and pinned in memory, no
+ // os::commit_memory() or os::uncommit_memory().
+ bool _special;
+
+ // MPSS Support
+ // Each virtualspace region has a lower, middle, and upper region.
+ // Each region has an end boundary and a high pointer which is the
+ // high water mark for the last allocated byte.
+ // The lower and upper unaligned to LargePageSizeInBytes uses default page.
+ // size. The middle region uses large page size.
+ char* _lower_high;
+ char* _middle_high;
+ char* _upper_high;
+
+ char* _lower_high_boundary;
+ char* _middle_high_boundary;
+ char* _upper_high_boundary;
+
+ size_t _lower_alignment;
+ size_t _middle_alignment;
+ size_t _upper_alignment;
+
+ // MPSS Accessors
+ char* lower_high() const { return _lower_high; }
+ char* middle_high() const { return _middle_high; }
+ char* upper_high() const { return _upper_high; }
+
+ char* lower_high_boundary() const { return _lower_high_boundary; }
+ char* middle_high_boundary() const { return _middle_high_boundary; }
+ char* upper_high_boundary() const { return _upper_high_boundary; }
+
+ size_t lower_alignment() const { return _lower_alignment; }
+ size_t middle_alignment() const { return _middle_alignment; }
+ size_t upper_alignment() const { return _upper_alignment; }
+
+ public:
+ // Committed area
+ char* low() const { return _low; }
+ char* high() const { return _high; }
+
+ // Reserved area
+ char* low_boundary() const { return _low_boundary; }
+ char* high_boundary() const { return _high_boundary; }
+
+ bool special() const { return _special; }
+
+ public:
+ // Initialization
+ VirtualSpace();
+ bool initialize(ReservedSpace rs, size_t committed_byte_size);
+
+ // Destruction
+ ~VirtualSpace();
+
+ // Testers (all sizes are byte sizes)
+ size_t committed_size() const;
+ size_t reserved_size() const;
+ size_t uncommitted_size() const;
+ bool contains(const void* p) const;
+
+ // Operations
+ // returns true on success, false otherwise
+ bool expand_by(size_t bytes, bool pre_touch = false);
+ void shrink_by(size_t bytes);
+ void release();
+
+ void check_for_contiguity() PRODUCT_RETURN;
+
+ // Debugging
+ void print() PRODUCT_RETURN;
+};