jdk8-mips64-public/hotspot: src/share/vm/code/oopRecorder.hpp@ac27a9c85bea (annotated)

src/share/vm/code/oopRecorder.hpp@ac27a9c85bea (annotated)

src/share/vm/code/oopRecorder.hpp

Thu, 24 May 2018 18:41:44 +0800

author: aoqi
date: Thu, 24 May 2018 18:41:44 +0800
changeset 8856: ac27a9c85bea
parent 6876: 710a3c8b516e
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1998, 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_CODE_OOPRECORDER_HPP
 #define SHARE_VM_CODE_OOPRECORDER_HPP
 #include "memory/universe.hpp"
 #include "runtime/handles.hpp"
 #include "utilities/growableArray.hpp"
 // Recording and retrieval of either oop relocations or metadata in compiled code.
 class CodeBlob;
 template <class T> class ValueRecorder : public StackObj {
  public:
   // A two-way mapping from positive indexes to oop handles.
   // The zero index is reserved for a constant (sharable) null.
   // Indexes may not be negative.
   // Use the given arena to manage storage, if not NULL.
   // By default, uses the current ResourceArea.
   ValueRecorder(Arena* arena = NULL);
   // Generate a new index on which nmethod::oop_addr_at will work.
   // allocate_index and find_index never return the same index,
   // and allocate_index never returns the same index twice.
   // In fact, two successive calls to allocate_index return successive ints.
   int allocate_index(T h) {
     return add_handle(h, false);
   }
   // For a given jobject or Metadata*, this will return the same index
   // repeatedly. The index can later be given to nmethod::oop_at or
   // metadata_at to retrieve the oop.
   // However, the oop must not be changed via nmethod::oop_addr_at.
   int find_index(T h) {
     int index = maybe_find_index(h);
     if (index < 0) {  // previously unallocated
       index = add_handle(h, true);
     }
     return index;
   }
   // returns the size of the generated oop/metadata table, for sizing the
   // CodeBlob. Must be called after all oops are allocated!
   int size();
   // Retrieve the value at a given index.
   T at(int index);
   int count() {
     if (_handles == NULL) return 0;
     // there is always a NULL virtually present as first object
     return _handles->length() + first_index;
   }
   // Helper function; returns false for NULL or Universe::non_oop_word().
   bool is_real(T h) {
     return h != NULL && h != (T)Universe::non_oop_word();
   }
   // copy the generated table to nmethod
   void copy_values_to(nmethod* nm);
   bool is_unused() { return _handles == NULL && !_complete; }
 #ifdef ASSERT
   bool is_complete() { return _complete; }
 #endif
  private:
   // variant of find_index which does not allocate if not found (yields -1)
   int maybe_find_index(T h);
   // leaky hash table of handle => index, to help detect duplicate insertion
   template <class X> class IndexCache : public ResourceObj {
     // This class is only used by the ValueRecorder class.
     friend class ValueRecorder;
     enum {
       _log_cache_size = 9,
       _cache_size = (1<<_log_cache_size),
       // Index entries are ints.  The LSBit is a collision indicator.
       _collision_bit_shift = 0,
       _collision_bit = 1,
       _index_shift = _collision_bit_shift+1
     };
     int _cache[_cache_size];
     static juint cache_index(X handle) {
       juint ci = (int) (intptr_t) handle;
       ci ^= ci >> (BitsPerByte*2);
       ci += ci >> (BitsPerByte*1);
       return ci & (_cache_size-1);
     }
     int* cache_location(X handle) {
       return &_cache[ cache_index(handle) ];
     }
     static bool cache_location_collision(int* cloc) {
       return ((*cloc) & _collision_bit) != 0;
     }
     static int cache_location_index(int* cloc) {
       return (*cloc) >> _index_shift;
     }
     static void set_cache_location_index(int* cloc, int index) {
       int cval0 = (*cloc);
       int cval1 = (index << _index_shift);
       if (cval0 != 0 && cval1 != cval0)  cval1 += _collision_bit;
       (*cloc) = cval1;
     }
     IndexCache();
   };
   void maybe_initialize();
   int add_handle(T h, bool make_findable);
   enum { null_index = 0, first_index = 1, index_cache_threshold = 20 };
   GrowableArray<T>*        _handles;  // ordered list (first is always NULL)
   GrowableArray<int>*       _no_finds; // all unfindable indexes; usually empty
   IndexCache<T>*           _indexes;  // map: handle -> its probable index
   Arena*                    _arena;
   bool                      _complete;
 #ifdef ASSERT
   static int _find_index_calls, _hit_indexes, _missed_indexes;
 #endif
 };
 class OopRecorder : public ResourceObj {
  private:
   ValueRecorder<jobject>      _oops;
   ValueRecorder<Metadata*>    _metadata;
  public:
   OopRecorder(Arena* arena = NULL): _oops(arena), _metadata(arena) {}
   int allocate_oop_index(jobject h) {
     return _oops.allocate_index(h);
   }
   int find_index(jobject h) {
     return _oops.find_index(h);
   }
   jobject oop_at(int index) {
     return _oops.at(index);
   }
   int oop_size() {
     return _oops.size();
   }
   int oop_count() {
     return _oops.count();
   }
   bool is_real(jobject h) {
     return _oops.is_real(h);
   }
   int allocate_metadata_index(Metadata* oop) {
     return _metadata.allocate_index(oop);
   }
   int find_index(Metadata* h) {
     return _metadata.find_index(h);
   }
   Metadata* metadata_at(int index) {
     return _metadata.at(index);
   }
   int metadata_size() {
     return _metadata.size();
   }
   int metadata_count() {
     return _metadata.count();
   }
   bool is_real(Metadata* h) {
     return _metadata.is_real(h);
   }
   bool is_unused() {
     return _oops.is_unused() && _metadata.is_unused();
   }
   void freeze() {
     _oops.size();
     _metadata.size();
   }
   void copy_values_to(nmethod* nm) {
     if (!_oops.is_unused()) {
       _oops.copy_values_to(nm);
     }
     if (!_metadata.is_unused()) {
       _metadata.copy_values_to(nm);
     }
   }
 #ifdef ASSERT
   bool is_complete() {
     assert(_oops.is_complete() == _metadata.is_complete(), "must agree");
     return _oops.is_complete();
   }
 #endif
 };
 #endif // SHARE_VM_CODE_OOPRECORDER_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/code/oopRecorder.hpp@ac27a9c85bea (annotated)

src/share/vm/code/oopRecorder.hpp