author | goetz |
Wed, 04 Jun 2014 11:56:44 +0200 | |
changeset 25351 | 7c198a690050 |
parent 18086 | f44cf213a775 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2013, 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_SERVICES_MEM_PTR_HPP |
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#define SHARE_VM_SERVICES_MEM_PTR_HPP |
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#include "memory/allocation.hpp" |
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#include "runtime/os.hpp" |
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#include "runtime/safepoint.hpp" |
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/* |
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* global sequence generator that generates sequence numbers to serialize |
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* memory records. |
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*/ |
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class SequenceGenerator : AllStatic { |
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public: |
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static jint next(); |
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// peek last sequence number |
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static jint peek() { |
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return _seq_number; |
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} |
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// reset sequence number |
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static void reset() { |
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assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); |
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_seq_number = 1; |
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_generation ++; |
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}; |
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static unsigned long current_generation() { return _generation; } |
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NOT_PRODUCT(static jint max_seq_num() { return _max_seq_number; }) |
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private: |
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static volatile jint _seq_number; |
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static volatile unsigned long _generation; |
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NOT_PRODUCT(static jint _max_seq_number; ) |
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}; |
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/* |
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* followings are the classes that are used to hold memory activity records in different stages. |
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* MemPointer |
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* |--------MemPointerRecord |
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* | |
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* |----MemPointerRecordEx |
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* | | |
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* | |-------SeqMemPointerRecordEx |
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* | |
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* |----SeqMemPointerRecord |
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* | |
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* |----VMMemRegion |
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* | |
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* |-----VMMemRegionEx |
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* |
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* |
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* prefix 'Seq' - sequenced, the record contains a sequence number |
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* surfix 'Ex' - extension, the record contains a caller's pc |
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* |
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* per-thread recorder : SeqMemPointerRecord(Ex) |
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* snapshot staging : SeqMemPointerRecord(Ex) |
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* snapshot : MemPointerRecord(Ex) and VMMemRegion(Ex) |
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* |
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*/ |
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/* |
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* class that wraps an address to a memory block, |
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* the memory pointer either points to a malloc'd |
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* memory block, or a mmap'd memory block |
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*/ |
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class MemPointer VALUE_OBJ_CLASS_SPEC { |
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public: |
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MemPointer(): _addr(0) { } |
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MemPointer(address addr): _addr(addr) { } |
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MemPointer(const MemPointer& copy_from) { |
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_addr = copy_from.addr(); |
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} |
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inline address addr() const { |
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return _addr; |
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} |
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inline operator address() const { |
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return addr(); |
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} |
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inline bool operator == (const MemPointer& other) const { |
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return addr() == other.addr(); |
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} |
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inline MemPointer& operator = (const MemPointer& other) { |
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_addr = other.addr(); |
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return *this; |
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} |
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protected: |
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inline void set_addr(address addr) { _addr = addr; } |
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protected: |
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// memory address |
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address _addr; |
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}; |
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/* MemPointerRecord records an activityand associated |
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* attributes on a memory block. |
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*/ |
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class MemPointerRecord : public MemPointer { |
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private: |
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MEMFLAGS _flags; |
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size_t _size; |
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public: |
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/* extension of MemoryType enum |
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* see share/vm/memory/allocation.hpp for details. |
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* |
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* The tag values are associated to sorting orders, so be |
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* careful if changes are needed. |
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* The allocation records should be sorted ahead of tagging |
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* records, which in turn ahead of deallocation records |
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*/ |
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enum MemPointerTags { |
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tag_alloc = 0x0001, // malloc or reserve record |
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tag_commit = 0x0002, // commit record |
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tag_type = 0x0003, // tag virtual memory to a memory type |
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tag_uncommit = 0x0004, // uncommit record |
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tag_release = 0x0005, // free or release record |
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tag_size = 0x0006, // arena size |
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tag_masks = 0x0007, // all tag bits |
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vmBit = 0x0008 |
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}; |
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/* helper functions to interpret the tagging flags */ |
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inline static bool is_allocation_record(MEMFLAGS flags) { |
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return (flags & tag_masks) == tag_alloc; |
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} |
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inline static bool is_deallocation_record(MEMFLAGS flags) { |
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return (flags & tag_masks) == tag_release; |
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} |
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inline static bool is_arena_record(MEMFLAGS flags) { |
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return (flags & (otArena | tag_size)) == otArena; |
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} |
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inline static bool is_arena_memory_record(MEMFLAGS flags) { |
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return (flags & (otArena | tag_size)) == (otArena | tag_size); |
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} |
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inline static bool is_virtual_memory_record(MEMFLAGS flags) { |
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return (flags & vmBit) != 0; |
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} |
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inline static bool is_virtual_memory_reserve_record(MEMFLAGS flags) { |
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return (flags & 0x0F) == (tag_alloc | vmBit); |
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} |
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inline static bool is_virtual_memory_commit_record(MEMFLAGS flags) { |
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return (flags & 0x0F) == (tag_commit | vmBit); |
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} |
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inline static bool is_virtual_memory_uncommit_record(MEMFLAGS flags) { |
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return (flags & 0x0F) == (tag_uncommit | vmBit); |
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} |
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inline static bool is_virtual_memory_release_record(MEMFLAGS flags) { |
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return (flags & 0x0F) == (tag_release | vmBit); |
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} |
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inline static bool is_virtual_memory_type_record(MEMFLAGS flags) { |
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return (flags & 0x0F) == (tag_type | vmBit); |
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} |
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/* tagging flags */ |
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inline static MEMFLAGS malloc_tag() { return tag_alloc; } |
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inline static MEMFLAGS free_tag() { return tag_release; } |
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inline static MEMFLAGS arena_size_tag() { return tag_size | otArena; } |
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inline static MEMFLAGS virtual_memory_tag() { return vmBit; } |
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inline static MEMFLAGS virtual_memory_reserve_tag() { return (tag_alloc | vmBit); } |
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inline static MEMFLAGS virtual_memory_commit_tag() { return (tag_commit | vmBit); } |
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inline static MEMFLAGS virtual_memory_uncommit_tag(){ return (tag_uncommit | vmBit); } |
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inline static MEMFLAGS virtual_memory_release_tag() { return (tag_release | vmBit); } |
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inline static MEMFLAGS virtual_memory_type_tag() { return (tag_type | vmBit); } |
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public: |
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MemPointerRecord(): _size(0), _flags(mtNone) { } |
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MemPointerRecord(address addr, MEMFLAGS memflags, size_t size = 0): |
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MemPointer(addr), _flags(memflags), _size(size) { } |
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MemPointerRecord(const MemPointerRecord& copy_from): |
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MemPointer(copy_from), _flags(copy_from.flags()), |
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_size(copy_from.size()) { |
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} |
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/* MemPointerRecord is not sequenced, it always return |
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* 0 to indicate non-sequenced |
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*/ |
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virtual jint seq() const { return 0; } |
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inline size_t size() const { return _size; } |
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inline void set_size(size_t size) { _size = size; } |
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inline MEMFLAGS flags() const { return _flags; } |
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inline void set_flags(MEMFLAGS flags) { _flags = flags; } |
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MemPointerRecord& operator= (const MemPointerRecord& ptr) { |
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MemPointer::operator=(ptr); |
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_flags = ptr.flags(); |
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#ifdef ASSERT |
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if (IS_ARENA_OBJ(_flags)) { |
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assert(!is_vm_pointer(), "wrong flags"); |
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assert((_flags & ot_masks) == otArena, "wrong flags"); |
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} |
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#endif |
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_size = ptr.size(); |
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return *this; |
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} |
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// if the pointer represents a malloc-ed memory address |
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inline bool is_malloced_pointer() const { |
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return !is_vm_pointer(); |
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} |
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// if the pointer represents a virtual memory address |
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inline bool is_vm_pointer() const { |
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return is_virtual_memory_record(_flags); |
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} |
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// if this record records a 'malloc' or virtual memory |
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// 'reserve' call |
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inline bool is_allocation_record() const { |
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return is_allocation_record(_flags); |
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} |
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// if this record records a size information of an arena |
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inline bool is_arena_memory_record() const { |
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return is_arena_memory_record(_flags); |
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} |
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// if this pointer represents an address to an arena object |
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inline bool is_arena_record() const { |
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return is_arena_record(_flags); |
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} |
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// if this record represents a size information of specific arena |
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inline bool is_memory_record_of_arena(const MemPointerRecord* arena_rc) { |
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assert(is_arena_memory_record(), "not size record"); |
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assert(arena_rc->is_arena_record(), "not arena record"); |
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return (arena_rc->addr() + sizeof(void*)) == addr(); |
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} |
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// if this record records a 'free' or virtual memory 'free' call |
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inline bool is_deallocation_record() const { |
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return is_deallocation_record(_flags); |
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} |
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// if this record records a virtual memory 'commit' call |
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inline bool is_commit_record() const { |
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return is_virtual_memory_commit_record(_flags); |
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} |
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// if this record records a virtual memory 'uncommit' call |
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inline bool is_uncommit_record() const { |
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return is_virtual_memory_uncommit_record(_flags); |
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} |
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// if this record is a tagging record of a virtual memory block |
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inline bool is_type_tagging_record() const { |
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return is_virtual_memory_type_record(_flags); |
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} |
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// if the two memory pointer records actually represent the same |
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// memory block |
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inline bool is_same_region(const MemPointerRecord* other) const { |
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return (addr() == other->addr() && size() == other->size()); |
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} |
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// if this memory region fully contains another one |
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inline bool contains_region(const MemPointerRecord* other) const { |
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return contains_region(other->addr(), other->size()); |
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} |
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// if this memory region fully contains specified memory range |
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inline bool contains_region(address add, size_t sz) const { |
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return (addr() <= add && addr() + size() >= add + sz); |
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} |
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inline bool contains_address(address add) const { |
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return (addr() <= add && addr() + size() > add); |
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} |
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// if this memory region overlaps another region |
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inline bool overlaps_region(const MemPointerRecord* other) const { |
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assert(other != NULL, "Just check"); |
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assert(size() > 0 && other->size() > 0, "empty range"); |
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return contains_address(other->addr()) || |
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contains_address(other->addr() + other->size() - 1) || // exclude end address |
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other->contains_address(addr()) || |
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other->contains_address(addr() + size() - 1); // exclude end address |
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} |
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}; |
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// MemPointerRecordEx also records callsite pc, from where |
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327 |
// the memory block is allocated |
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328 |
class MemPointerRecordEx : public MemPointerRecord { |
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329 |
private: |
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330 |
address _pc; // callsite pc |
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331 |
||
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public: |
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333 |
MemPointerRecordEx(): _pc(0) { } |
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MemPointerRecordEx(address addr, MEMFLAGS memflags, size_t size = 0, address pc = 0): |
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MemPointerRecord(addr, memflags, size), _pc(pc) {} |
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MemPointerRecordEx(const MemPointerRecordEx& copy_from): |
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MemPointerRecord(copy_from), _pc(copy_from.pc()) {} |
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inline address pc() const { return _pc; } |
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void init(const MemPointerRecordEx* mpe) { |
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MemPointerRecord::operator=(*mpe); |
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_pc = mpe->pc(); |
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} |
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void init(const MemPointerRecord* mp) { |
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MemPointerRecord::operator=(*mp); |
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_pc = 0; |
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} |
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}; |
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// a virtual memory region. The region can represent a reserved |
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// virtual memory region or a committed memory region |
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class VMMemRegion : public MemPointerRecord { |
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public: |
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VMMemRegion() { } |
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void init(const MemPointerRecord* mp) { |
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assert(mp->is_vm_pointer(), "Sanity check"); |
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_addr = mp->addr(); |
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set_size(mp->size()); |
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set_flags(mp->flags()); |
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} |
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VMMemRegion& operator=(const VMMemRegion& other) { |
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MemPointerRecord::operator=(other); |
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return *this; |
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} |
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inline bool is_reserved_region() const { |
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return is_allocation_record(); |
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} |
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inline bool is_committed_region() const { |
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return is_commit_record(); |
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} |
379 |
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/* base address of this virtual memory range */ |
|
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inline address base() const { |
|
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return addr(); |
|
383 |
} |
|
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/* tag this virtual memory range to the specified memory type */ |
|
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inline void tag(MEMFLAGS f) { |
|
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set_flags(flags() | (f & mt_masks)); |
|
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} |
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// expand this region to also cover specified range. |
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// The range has to be on either end of the memory region. |
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void expand_region(address addr, size_t sz) { |
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if (addr < base()) { |
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assert(addr + sz == base(), "Sanity check"); |
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_addr = addr; |
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set_size(size() + sz); |
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} else { |
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assert(base() + size() == addr, "Sanity check"); |
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set_size(size() + sz); |
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} |
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} |
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402 |
|
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// exclude the specified address range from this region. |
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// The excluded memory range has to be on either end of this memory |
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// region. |
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inline void exclude_region(address add, size_t sz) { |
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assert(is_reserved_region() || is_committed_region(), "Sanity check"); |
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assert(addr() != NULL && size() != 0, "Sanity check"); |
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assert(add >= addr() && add < addr() + size(), "Sanity check"); |
13195 | 410 |
assert(add == addr() || (add + sz) == (addr() + size()), |
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"exclude in the middle"); |
13195 | 412 |
if (add == addr()) { |
413 |
set_addr(add + sz); |
|
414 |
set_size(size() - sz); |
|
415 |
} else { |
|
416 |
set_size(size() - sz); |
|
417 |
} |
|
418 |
} |
|
419 |
}; |
|
420 |
||
421 |
class VMMemRegionEx : public VMMemRegion { |
|
422 |
private: |
|
423 |
jint _seq; // sequence number |
|
424 |
||
425 |
public: |
|
426 |
VMMemRegionEx(): _pc(0) { } |
|
427 |
||
428 |
void init(const MemPointerRecordEx* mpe) { |
|
429 |
VMMemRegion::init(mpe); |
|
430 |
_pc = mpe->pc(); |
|
431 |
} |
|
432 |
||
433 |
void init(const MemPointerRecord* mpe) { |
|
434 |
VMMemRegion::init(mpe); |
|
435 |
_pc = 0; |
|
436 |
} |
|
437 |
||
438 |
VMMemRegionEx& operator=(const VMMemRegionEx& other) { |
|
439 |
VMMemRegion::operator=(other); |
|
440 |
_pc = other.pc(); |
|
441 |
return *this; |
|
442 |
} |
|
443 |
||
444 |
inline address pc() const { return _pc; } |
|
445 |
private: |
|
446 |
address _pc; |
|
447 |
}; |
|
448 |
||
449 |
/* |
|
450 |
* Sequenced memory record |
|
451 |
*/ |
|
452 |
class SeqMemPointerRecord : public MemPointerRecord { |
|
453 |
private: |
|
454 |
jint _seq; // sequence number |
|
455 |
||
456 |
public: |
|
457 |
SeqMemPointerRecord(): _seq(0){ } |
|
458 |
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SeqMemPointerRecord(address addr, MEMFLAGS flags, size_t size, jint seq) |
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: MemPointerRecord(addr, flags, size), _seq(seq) { |
13195 | 461 |
} |
462 |
||
463 |
SeqMemPointerRecord(const SeqMemPointerRecord& copy_from) |
|
464 |
: MemPointerRecord(copy_from) { |
|
465 |
_seq = copy_from.seq(); |
|
466 |
} |
|
467 |
||
468 |
SeqMemPointerRecord& operator= (const SeqMemPointerRecord& ptr) { |
|
469 |
MemPointerRecord::operator=(ptr); |
|
470 |
_seq = ptr.seq(); |
|
471 |
return *this; |
|
472 |
} |
|
473 |
||
474 |
inline jint seq() const { |
|
475 |
return _seq; |
|
476 |
} |
|
477 |
}; |
|
478 |
||
479 |
||
480 |
||
481 |
class SeqMemPointerRecordEx : public MemPointerRecordEx { |
|
482 |
private: |
|
483 |
jint _seq; // sequence number |
|
484 |
||
485 |
public: |
|
486 |
SeqMemPointerRecordEx(): _seq(0) { } |
|
487 |
||
488 |
SeqMemPointerRecordEx(address addr, MEMFLAGS flags, size_t size, |
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489 |
jint seq, address pc): |
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|
490 |
MemPointerRecordEx(addr, flags, size, pc), _seq(seq) { |
13195 | 491 |
} |
492 |
||
493 |
SeqMemPointerRecordEx(const SeqMemPointerRecordEx& copy_from) |
|
494 |
: MemPointerRecordEx(copy_from) { |
|
495 |
_seq = copy_from.seq(); |
|
496 |
} |
|
497 |
||
498 |
SeqMemPointerRecordEx& operator= (const SeqMemPointerRecordEx& ptr) { |
|
499 |
MemPointerRecordEx::operator=(ptr); |
|
500 |
_seq = ptr.seq(); |
|
501 |
return *this; |
|
502 |
} |
|
503 |
||
504 |
inline jint seq() const { |
|
505 |
return _seq; |
|
506 |
} |
|
507 |
}; |
|
508 |
||
509 |
#endif // SHARE_VM_SERVICES_MEM_PTR_HPP |