jdk8-mips64-public/hotspot: src/share/vm/services/memPtr.hpp@35f8765422b9 (annotated)

src/share/vm/services/memPtr.hpp@35f8765422b9 (annotated)

src/share/vm/services/memPtr.hpp

Wed, 10 Apr 2013 08:55:50 -0400

author: zgu
date: Wed, 10 Apr 2013 08:55:50 -0400
changeset 4927: 35f8765422b9
parent 4512: 4102b59539ce
child 4959: b80cc96882f7
permissions: -rw-r--r--

8010151: nsk/regression/b6653214 fails "assert(snapshot != NULL) failed: Worker should not be started"
Summary: Fixed a racing condition when shutting down NMT while worker thread is being started, also fixed a few mis-declared volatile pointers.
Reviewed-by: dholmes, dlong

 /*
  * Copyright (c) 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_SERVICES_MEM_PTR_HPP
 #define SHARE_VM_SERVICES_MEM_PTR_HPP
 #include "memory/allocation.hpp"
 #include "runtime/atomic.hpp"
 #include "runtime/os.hpp"
 #include "runtime/safepoint.hpp"
 /*
  * global sequence generator that generates sequence numbers to serialize
  * memory records.
  */
 class SequenceGenerator : AllStatic {
  public:
   static jint next();
   // peek last sequence number
   static jint peek() {
     return _seq_number;
   }
   // reset sequence number
   static void reset() {
     assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required");
     _seq_number = 1;
     _generation ++;
   };
   static unsigned long current_generation() { return _generation; }
   NOT_PRODUCT(static jint max_seq_num() { return _max_seq_number; })
  private:
   static volatile jint             _seq_number;
   static volatile unsigned long    _generation;
   NOT_PRODUCT(static jint          _max_seq_number; )
 };
 /*
  * followings are the classes that are used to hold memory activity records in different stages.
  *   MemPointer
  *     |--------MemPointerRecord
  *                     |
  *                     |----MemPointerRecordEx
  *                     |           |
  *                     |           |-------SeqMemPointerRecordEx
  *                     |
  *                     |----SeqMemPointerRecord
  *                     |
  *                     |----VMMemRegion
  *                               |
  *                               |-----VMMemRegionEx
  *
  *
  *  prefix 'Seq' - sequenced, the record contains a sequence number
  *  surfix 'Ex'  - extension, the record contains a caller's pc
  *
  *  per-thread recorder : SeqMemPointerRecord(Ex)
  *  snapshot staging    : SeqMemPointerRecord(Ex)
  *  snapshot            : MemPointerRecord(Ex) and VMMemRegion(Ex)
  *
  */
 /*
  * class that wraps an address to a memory block,
  * the memory pointer either points to a malloc'd
  * memory block, or a mmap'd memory block
  */
 class MemPointer : public _ValueObj {
  public:
   MemPointer(): _addr(0) { }
   MemPointer(address addr): _addr(addr) { }
   MemPointer(const MemPointer& copy_from) {
     _addr = copy_from.addr();
   }
   inline address addr() const {
     return _addr;
   }
   inline operator address() const {
     return addr();
   }
   inline bool operator == (const MemPointer& other) const {
     return addr() == other.addr();
   }
   inline MemPointer& operator = (const MemPointer& other) {
     _addr = other.addr();
     return *this;
   }
  protected:
   inline void set_addr(address addr) { _addr = addr; }
  protected:
   // memory address
   address    _addr;
 };
 /* MemPointerRecord records an activityand associated
  * attributes on a memory block.
  */
 class MemPointerRecord : public MemPointer {
  private:
   MEMFLAGS       _flags;
   size_t         _size;
 public:
   /* extension of MemoryType enum
    * see share/vm/memory/allocation.hpp for details.
    *
    * The tag values are associated to sorting orders, so be
    * careful if changes are needed.
    * The allocation records should be sorted ahead of tagging
    * records, which in turn ahead of deallocation records
    */
   enum MemPointerTags {
     tag_alloc            = 0x0001, // malloc or reserve record
     tag_commit           = 0x0002, // commit record
     tag_type             = 0x0003, // tag virtual memory to a memory type
     tag_uncommit         = 0x0004, // uncommit record
     tag_release          = 0x0005, // free or release record
     tag_size             = 0x0006, // arena size
     tag_masks            = 0x0007, // all tag bits
     vmBit                = 0x0008
   };
   /* helper functions to interpret the tagging flags */
   inline static bool is_allocation_record(MEMFLAGS flags) {
     return (flags & tag_masks) == tag_alloc;
   }
   inline static bool is_deallocation_record(MEMFLAGS flags) {
     return (flags & tag_masks) == tag_release;
   }
   inline static bool is_arena_record(MEMFLAGS flags) {
     return (flags & (otArena | tag_size)) == otArena;
   }
   inline static bool is_arena_memory_record(MEMFLAGS flags) {
     return (flags & (otArena | tag_size)) == (otArena | tag_size);
   }
   inline static bool is_virtual_memory_record(MEMFLAGS flags) {
     return (flags & vmBit) != 0;
   }
   inline static bool is_virtual_memory_reserve_record(MEMFLAGS flags) {
     return (flags & 0x0F) == (tag_alloc | vmBit);
   }
   inline static bool is_virtual_memory_commit_record(MEMFLAGS flags) {
     return (flags & 0x0F) == (tag_commit | vmBit);
   }
   inline static bool is_virtual_memory_uncommit_record(MEMFLAGS flags) {
     return (flags & 0x0F) == (tag_uncommit | vmBit);
   }
   inline static bool is_virtual_memory_release_record(MEMFLAGS flags) {
     return (flags & 0x0F) == (tag_release | vmBit);
   }
   inline static bool is_virtual_memory_type_record(MEMFLAGS flags) {
     return (flags & 0x0F) == (tag_type | vmBit);
   }
   /* tagging flags */
   inline static MEMFLAGS malloc_tag()                 { return tag_alloc;   }
   inline static MEMFLAGS free_tag()                   { return tag_release; }
   inline static MEMFLAGS arena_size_tag()             { return tag_size | otArena; }
   inline static MEMFLAGS virtual_memory_tag()         { return vmBit; }
   inline static MEMFLAGS virtual_memory_reserve_tag() { return (tag_alloc | vmBit); }
   inline static MEMFLAGS virtual_memory_commit_tag()  { return (tag_commit | vmBit); }
   inline static MEMFLAGS virtual_memory_uncommit_tag(){ return (tag_uncommit | vmBit); }
   inline static MEMFLAGS virtual_memory_release_tag() { return (tag_release | vmBit); }
   inline static MEMFLAGS virtual_memory_type_tag()    { return (tag_type | vmBit); }
  public:
   MemPointerRecord(): _size(0), _flags(mtNone) { }
   MemPointerRecord(address addr, MEMFLAGS memflags, size_t size = 0):
       MemPointer(addr), _flags(memflags), _size(size) { }
   MemPointerRecord(const MemPointerRecord& copy_from):
     MemPointer(copy_from), _flags(copy_from.flags()),
     _size(copy_from.size()) {
   }
   /* MemPointerRecord is not sequenced, it always return
    * 0 to indicate non-sequenced
    */
   virtual jint seq() const               { return 0; }
   inline size_t   size()  const          { return _size; }
   inline void set_size(size_t size)      { _size = size; }
   inline MEMFLAGS flags() const          { return _flags; }
   inline void set_flags(MEMFLAGS flags)  { _flags = flags; }
   MemPointerRecord& operator= (const MemPointerRecord& ptr) {
     MemPointer::operator=(ptr);
     _flags = ptr.flags();
 #ifdef ASSERT
     if (IS_ARENA_OBJ(_flags)) {
       assert(!is_vm_pointer(), "wrong flags");
       assert((_flags & ot_masks) == otArena, "wrong flags");
     }
 #endif
     _size = ptr.size();
     return *this;
   }
   // if the pointer represents a malloc-ed memory address
   inline bool is_malloced_pointer() const {
     return !is_vm_pointer();
   }
   // if the pointer represents a virtual memory address
   inline bool is_vm_pointer() const {
     return is_virtual_memory_record(_flags);
   }
   // if this record records a 'malloc' or virtual memory
   // 'reserve' call
   inline bool is_allocation_record() const {
     return is_allocation_record(_flags);
   }
   // if this record records a size information of an arena
   inline bool is_arena_memory_record() const {
     return is_arena_memory_record(_flags);
   }
   // if this pointer represents an address to an arena object
   inline bool is_arena_record() const {
     return is_arena_record(_flags);
   }
   // if this record represents a size information of specific arena
   inline bool is_memory_record_of_arena(const MemPointerRecord* arena_rc) {
     assert(is_arena_memory_record(), "not size record");
     assert(arena_rc->is_arena_record(), "not arena record");
     return (arena_rc->addr() + sizeof(void*)) == addr();
   }
   // if this record records a 'free' or virtual memory 'free' call
   inline bool is_deallocation_record() const {
     return is_deallocation_record(_flags);
   }
   // if this record records a virtual memory 'commit' call
   inline bool is_commit_record() const {
     return is_virtual_memory_commit_record(_flags);
   }
   // if this record records a virtual memory 'uncommit' call
   inline bool is_uncommit_record() const {
     return is_virtual_memory_uncommit_record(_flags);
   }
   // if this record is a tagging record of a virtual memory block
   inline bool is_type_tagging_record() const {
     return is_virtual_memory_type_record(_flags);
   }
   // if the two memory pointer records actually represent the same
   // memory block
   inline bool is_same_region(const MemPointerRecord* other) const {
     return (addr() == other->addr() && size() == other->size());
   }
   // if this memory region fully contains another one
   inline bool contains_region(const MemPointerRecord* other) const {
     return contains_region(other->addr(), other->size());
   }
   // if this memory region fully contains specified memory range
   inline bool contains_region(address add, size_t sz) const {
     return (addr() <= add && addr() + size() >= add + sz);
   }
   inline bool contains_address(address add) const {
     return (addr() <= add && addr() + size() > add);
   }
   // if this memory region overlaps another region
   inline bool overlaps_region(const MemPointerRecord* other) const {
     assert(other != NULL, "Just check");
     assert(size() > 0 && other->size() > 0, "empty range");
     return contains_address(other->addr()) ||
            contains_address(other->addr() + other->size() - 1) || // exclude end address
            other->contains_address(addr()) ||
            other->contains_address(addr() + size() - 1); // exclude end address
   }
 };
 // MemPointerRecordEx also records callsite pc, from where
 // the memory block is allocated
 class MemPointerRecordEx : public MemPointerRecord {
  private:
   address      _pc;  // callsite pc
  public:
   MemPointerRecordEx(): _pc(0) { }
   MemPointerRecordEx(address addr, MEMFLAGS memflags, size_t size = 0, address pc = 0):
     MemPointerRecord(addr, memflags, size), _pc(pc) {}
   MemPointerRecordEx(const MemPointerRecordEx& copy_from):
     MemPointerRecord(copy_from), _pc(copy_from.pc()) {}
   inline address pc() const { return _pc; }
   void init(const MemPointerRecordEx* mpe) {
     MemPointerRecord::operator=(*mpe);
     _pc = mpe->pc();
   }
   void init(const MemPointerRecord* mp) {
     MemPointerRecord::operator=(*mp);
     _pc = 0;
   }
 };
 // a virtual memory region. The region can represent a reserved
 // virtual memory region or a committed memory region
 class VMMemRegion : public MemPointerRecord {
 public:
   VMMemRegion() { }
   void init(const MemPointerRecord* mp) {
     assert(mp->is_vm_pointer(), "Sanity check");
     _addr = mp->addr();
       set_size(mp->size());
     set_flags(mp->flags());
   }
   VMMemRegion& operator=(const VMMemRegion& other) {
     MemPointerRecord::operator=(other);
     return *this;
   }
   inline bool is_reserved_region() const {
     return is_allocation_record();
   }
   inline bool is_committed_region() const {
     return is_commit_record();
   }
   /* base address of this virtual memory range */
   inline address base() const {
     return addr();
   }
   /* tag this virtual memory range to the specified memory type */
   inline void tag(MEMFLAGS f) {
     set_flags(flags() | (f & mt_masks));
   }
   // expand this region to also cover specified range.
   // The range has to be on either end of the memory region.
   void expand_region(address addr, size_t sz) {
     if (addr < base()) {
       assert(addr + sz == base(), "Sanity check");
       _addr = addr;
       set_size(size() + sz);
     } else {
       assert(base() + size() == addr, "Sanity check");
       set_size(size() + sz);
     }
   }
   // exclude the specified address range from this region.
   // The excluded memory range has to be on either end of this memory
   // region.
   inline void exclude_region(address add, size_t sz) {
     assert(is_reserved_region() || is_committed_region(), "Sanity check");
     assert(addr() != NULL && size() != 0, "Sanity check");
     assert(add >= addr() && add < addr() + size(), "Sanity check");
     assert(add == addr() || (add + sz) == (addr() + size()),
       "exclude in the middle");
     if (add == addr()) {
       set_addr(add + sz);
       set_size(size() - sz);
     } else {
       set_size(size() - sz);
     }
   }
 };
 class VMMemRegionEx : public VMMemRegion {
  private:
   jint   _seq;  // sequence number
  public:
   VMMemRegionEx(): _pc(0) { }
   void init(const MemPointerRecordEx* mpe) {
     VMMemRegion::init(mpe);
     _pc = mpe->pc();
   }
   void init(const MemPointerRecord* mpe) {
     VMMemRegion::init(mpe);
     _pc = 0;
   }
   VMMemRegionEx& operator=(const VMMemRegionEx& other) {
     VMMemRegion::operator=(other);
     _pc = other.pc();
     return *this;
   }
   inline address pc() const { return _pc; }
  private:
   address   _pc;
 };
 /*
  * Sequenced memory record
  */
 class SeqMemPointerRecord : public MemPointerRecord {
  private:
    jint _seq;  // sequence number
  public:
   SeqMemPointerRecord(): _seq(0){ }
   SeqMemPointerRecord(address addr, MEMFLAGS flags, size_t size)
     : MemPointerRecord(addr, flags, size) {
     _seq = SequenceGenerator::next();
   }
   SeqMemPointerRecord(const SeqMemPointerRecord& copy_from)
     : MemPointerRecord(copy_from) {
     _seq = copy_from.seq();
   }
   SeqMemPointerRecord& operator= (const SeqMemPointerRecord& ptr) {
     MemPointerRecord::operator=(ptr);
     _seq = ptr.seq();
     return *this;
   }
   inline jint seq() const {
     return _seq;
   }
 };
 class SeqMemPointerRecordEx : public MemPointerRecordEx {
  private:
   jint    _seq;  // sequence number
  public:
   SeqMemPointerRecordEx(): _seq(0) { }
   SeqMemPointerRecordEx(address addr, MEMFLAGS flags, size_t size,
     address pc): MemPointerRecordEx(addr, flags, size, pc) {
     _seq = SequenceGenerator::next();
   }
   SeqMemPointerRecordEx(const SeqMemPointerRecordEx& copy_from)
     : MemPointerRecordEx(copy_from) {
     _seq = copy_from.seq();
   }
   SeqMemPointerRecordEx& operator= (const SeqMemPointerRecordEx& ptr) {
     MemPointerRecordEx::operator=(ptr);
     _seq = ptr.seq();
     return *this;
   }
   inline jint seq() const {
     return _seq;
   }
 };
 #endif // SHARE_VM_SERVICES_MEM_PTR_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/memPtr.hpp@35f8765422b9 (annotated)

src/share/vm/services/memPtr.hpp