jdk8-mips64-public/hotspot: src/share/vm/runtime/virtualspace.hpp@b5cb079ecaa4 (annotated)

src/share/vm/runtime/virtualspace.hpp@b5cb079ecaa4 (annotated)

src/share/vm/runtime/virtualspace.hpp

Sun, 03 Feb 2013 22:43:57 +0100

author: ewendeli
date: Sun, 03 Feb 2013 22:43:57 +0100
changeset 4703: b5cb079ecaa4
parent 4037: da91efe96a93
child 5019: b294421fa3c5
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
 #include "memory/allocation.hpp"
 // 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 _noaccess_prefix;
   size_t _alignment;
   bool   _special;
   bool   _executable;
   // ReservedSpace
   ReservedSpace(char* base, size_t size, size_t alignment, bool special,
                 bool executable);
   void initialize(size_t size, size_t alignment, bool large,
                   char* requested_address,
                   const size_t noaccess_prefix,
                   bool executable);
   // 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);
  protected:
   // Create protection page at the beginning of the space.
   void protect_noaccess_prefix(const size_t size);
  public:
   // Constructor
   ReservedSpace(size_t size);
   ReservedSpace(size_t size, size_t alignment, bool large,
                 char* requested_address = NULL,
                 const size_t noaccess_prefix = 0);
   ReservedSpace(const size_t suffix_size, const size_t suffix_align,
                 char* requested_address,
                 const size_t noaccess_prefix = 0);
   ReservedSpace(size_t size, size_t alignment, bool large, bool executable);
   // Accessors
   char*  base()            const { return _base;      }
   size_t size()            const { return _size;      }
   size_t alignment()       const { return _alignment; }
   bool   special()         const { return _special;   }
   bool   executable()      const { return _executable;   }
   size_t noaccess_prefix() const { return _noaccess_prefix;   }
   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());
 }
 // Class encapsulating behavior specific of memory space reserved for Java heap
 class ReservedHeapSpace : public ReservedSpace {
 public:
   // Constructor
   ReservedHeapSpace(size_t size, size_t forced_base_alignment,
                     bool large, char* requested_address);
   ReservedHeapSpace(const size_t prefix_size, const size_t prefix_align,
                     char* requested_address);
 };
 // Class encapsulating behavior specific memory space for Code
 class ReservedCodeSpace : public ReservedSpace {
  public:
   // Constructor
   ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
 };
 // 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;
   // Need to know if commit should be executable.
   bool   _executable;
   // 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;
 };
 #endif // SHARE_VM_RUNTIME_VIRTUALSPACE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/virtualspace.hpp@b5cb079ecaa4 (annotated)

src/share/vm/runtime/virtualspace.hpp