hotspot/src/share/vm/code/oopRecorder.hpp
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8145338: compiler/jsr292/CallSiteDepContextTest.java fails: assert(dep_implicit_context_arg(dept) == 0) failed: sanity Reviewed-by: twisti
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/*
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 * Copyright (c) 1998, 2012, 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_CODE_OOPRECORDER_HPP
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#define SHARE_VM_CODE_OOPRECORDER_HPP
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#include "memory/universe.hpp"
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#include "runtime/handles.hpp"
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#include "utilities/growableArray.hpp"
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// Recording and retrieval of either oop relocations or metadata in compiled code.
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class CodeBlob;
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template <class T> class ValueRecorder : public StackObj {
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  // A two-way mapping from positive indexes to oop handles.
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  // The zero index is reserved for a constant (sharable) null.
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  // Indexes may not be negative.
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  // Use the given arena to manage storage, if not NULL.
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  // By default, uses the current ResourceArea.
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  ValueRecorder(Arena* arena = NULL);
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  // Generate a new index on which nmethod::oop_addr_at will work.
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  // allocate_index and find_index never return the same index,
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  // and allocate_index never returns the same index twice.
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  // In fact, two successive calls to allocate_index return successive ints.
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  int allocate_index(T h) {
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    return add_handle(h, false);
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  }
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  // For a given jobject or Metadata*, this will return the same index
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  // repeatedly. The index can later be given to nmethod::oop_at or
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  // metadata_at to retrieve the oop.
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  // However, the oop must not be changed via nmethod::oop_addr_at.
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  int find_index(T h) {
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    int index = maybe_find_index(h);
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    if (index < 0) {  // previously unallocated
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      index = add_handle(h, true);
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    }
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    return index;
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  }
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  // returns the size of the generated oop/metadata table, for sizing the
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  // CodeBlob. Must be called after all oops are allocated!
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  int size();
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  // Retrieve the value at a given index.
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  T at(int index);
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  int count() {
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    if (_handles == NULL) return 0;
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    // there is always a NULL virtually present as first object
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    return _handles->length() + first_index;
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  }
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  // Helper function; returns false for NULL or Universe::non_oop_word().
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  bool is_real(T h) {
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    return h != NULL && h != (T)Universe::non_oop_word();
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  }
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  // copy the generated table to nmethod
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  void copy_values_to(nmethod* nm);
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  bool is_unused() { return _handles == NULL && !_complete; }
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#ifdef ASSERT
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  bool is_complete() { return _complete; }
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#endif
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 private:
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  // variant of find_index which does not allocate if not found (yields -1)
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  int maybe_find_index(T h);
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  // leaky hash table of handle => index, to help detect duplicate insertion
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  template <class X> class IndexCache : public ResourceObj {
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    // This class is only used by the ValueRecorder class.
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    friend class ValueRecorder;
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    enum {
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      _log_cache_size = 9,
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      _cache_size = (1<<_log_cache_size),
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      // Index entries are ints.  The LSBit is a collision indicator.
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      _collision_bit_shift = 0,
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      _collision_bit = 1,
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      _index_shift = _collision_bit_shift+1
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    };
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    int _cache[_cache_size];
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    static juint cache_index(X handle) {
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      juint ci = (int) (intptr_t) handle;
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      ci ^= ci >> (BitsPerByte*2);
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      ci += ci >> (BitsPerByte*1);
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      return ci & (_cache_size-1);
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    }
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    int* cache_location(X handle) {
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      return &_cache[ cache_index(handle) ];
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    }
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    static bool cache_location_collision(int* cloc) {
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      return ((*cloc) & _collision_bit) != 0;
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    }
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    static int cache_location_index(int* cloc) {
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      return (*cloc) >> _index_shift;
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    }
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    static void set_cache_location_index(int* cloc, int index) {
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      int cval0 = (*cloc);
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      int cval1 = (index << _index_shift);
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      if (cval0 != 0 && cval1 != cval0)  cval1 += _collision_bit;
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      (*cloc) = cval1;
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    }
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    IndexCache();
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  };
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  void maybe_initialize();
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  int add_handle(T h, bool make_findable);
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  enum { null_index = 0, first_index = 1, index_cache_threshold = 20 };
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  GrowableArray<T>*        _handles;  // ordered list (first is always NULL)
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  GrowableArray<int>*       _no_finds; // all unfindable indexes; usually empty
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  IndexCache<T>*           _indexes;  // map: handle -> its probable index
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  Arena*                    _arena;
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  bool                      _complete;
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#ifdef ASSERT
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  static int _find_index_calls, _hit_indexes, _missed_indexes;
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#endif
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};
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class OopRecorder;
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class ObjectLookup : public ResourceObj {
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 private:
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  class ObjectEntry {
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   private:
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    jobject _value;
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    int     _index;
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   public:
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    ObjectEntry(jobject value, int index) : _value(value), _index(index) {}
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    ObjectEntry() : _value(NULL), _index(0) {}
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    oop oop_value() const;
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    int index() { return _index; }
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  };
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  GrowableArray<ObjectEntry> _values;
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  unsigned int _gc_count;
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  // Utility sort functions
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  static int sort_by_address(oop a, oop b);
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  static int sort_by_address(ObjectEntry* a, ObjectEntry* b);
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  static int sort_oop_by_address(oop const& a, ObjectEntry const& b);
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 public:
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  ObjectLookup();
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  // Resort list if a GC has occurred since the last sort
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  void maybe_resort();
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  int find_index(jobject object, OopRecorder* oop_recorder);
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};
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class OopRecorder : public ResourceObj {
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 private:
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  ValueRecorder<jobject>      _oops;
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  ValueRecorder<Metadata*>    _metadata;
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  ObjectLookup*               _object_lookup;
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 public:
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  OopRecorder(Arena* arena = NULL, bool deduplicate = false): _oops(arena), _metadata(arena) {
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    if (deduplicate) {
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      _object_lookup = new ObjectLookup();
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    } else {
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      _object_lookup = NULL;
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    }
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  }
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  int allocate_oop_index(jobject h) {
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    return _oops.allocate_index(h);
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  }
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  virtual int find_index(jobject h) {
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    return _object_lookup != NULL ? _object_lookup->find_index(h, this) : _oops.find_index(h);
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  }
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  jobject oop_at(int index) {
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    return _oops.at(index);
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  }
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  int oop_size() {
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    return _oops.size();
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  }
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  int oop_count() {
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    return _oops.count();
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  }
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  bool is_real(jobject h) {
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    return _oops.is_real(h);
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  }
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  int allocate_metadata_index(Metadata* oop) {
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    return _metadata.allocate_index(oop);
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  }
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  virtual int find_index(Metadata* h) {
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    return _metadata.find_index(h);
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  }
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  Metadata* metadata_at(int index) {
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    return _metadata.at(index);
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  }
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  int metadata_size() {
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    return _metadata.size();
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  }
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  int metadata_count() {
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    return _metadata.count();
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  }
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  bool is_real(Metadata* h) {
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    return _metadata.is_real(h);
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  }
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  bool is_unused() {
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    return _oops.is_unused() && _metadata.is_unused();
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  }
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  void freeze() {
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    _oops.size();
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    _metadata.size();
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  }
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  void copy_values_to(nmethod* nm) {
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    if (!_oops.is_unused()) {
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      _oops.copy_values_to(nm);
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    }
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    if (!_metadata.is_unused()) {
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      _metadata.copy_values_to(nm);
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    }
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  }
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#ifdef ASSERT
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  bool is_complete() {
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    assert(_oops.is_complete() == _metadata.is_complete(), "must agree");
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    return _oops.is_complete();
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  }
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#endif
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};
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#endif // SHARE_VM_CODE_OOPRECORDER_HPP