jdk8-mips64-public/hotspot: src/share/vm/compiler/oopMap.hpp@c18cbe5936b8 (annotated)

src/share/vm/compiler/oopMap.hpp@c18cbe5936b8 (annotated)

src/share/vm/compiler/oopMap.hpp

Thu, 27 May 2010 19:08:38 -0700

author: trims
date: Thu, 27 May 2010 19:08:38 -0700
changeset 1907: c18cbe5936b8
parent 1383: 89e0543e1737
child 2314: f95d63e2154a
permissions: -rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

 /*
  * Copyright (c) 1998, 2009, 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.
  *
  */
 // Interface for generating the frame map for compiled code.  A frame map
 // describes for a specific pc whether each register and frame stack slot is:
 //   Oop         - A GC root for current frame
 //   Value       - Live non-oop, non-float value: int, either half of double
 //   Dead        - Dead; can be Zapped for debugging
 //   CalleeXX    - Callee saved; also describes which caller register is saved
 //   DerivedXX   - A derived oop; original oop is described.
 //
 // OopMapValue describes a single OopMap entry
 class frame;
 class RegisterMap;
 class DerivedPointerEntry;
 class OopMapValue: public StackObj {
   friend class VMStructs;
 private:
   short _value;
   int value() const                                 { return _value; }
   void set_value(int value)                         { _value = value; }
   short _content_reg;
 public:
   // Constants
   enum { type_bits                = 5,
          register_bits            = BitsPerShort - type_bits };
   enum { type_shift               = 0,
          register_shift           = type_bits };
   enum { type_mask                = right_n_bits(type_bits),
          type_mask_in_place       = type_mask << type_shift,
          register_mask            = right_n_bits(register_bits),
          register_mask_in_place   = register_mask << register_shift };
   enum oop_types {              // must fit in type_bits
          unused_value =0,       // powers of 2, for masking OopMapStream
          oop_value = 1,
          value_value = 2,
          narrowoop_value = 4,
          callee_saved_value = 8,
          derived_oop_value= 16 };
   // Constructors
   OopMapValue () { set_value(0); set_content_reg(VMRegImpl::Bad()); }
   OopMapValue (VMReg reg, oop_types t) { set_reg_type(reg,t); }
   OopMapValue (VMReg reg, oop_types t, VMReg reg2) { set_reg_type(reg,t); set_content_reg(reg2); }
   OopMapValue (CompressedReadStream* stream) { read_from(stream); }
   // Archiving
   void write_on(CompressedWriteStream* stream) {
     stream->write_int(value());
     if(is_callee_saved() || is_derived_oop()) {
       stream->write_int(content_reg()->value());
     }
   }
   void read_from(CompressedReadStream* stream) {
     set_value(stream->read_int());
     if(is_callee_saved() || is_derived_oop()) {
       set_content_reg(VMRegImpl::as_VMReg(stream->read_int(), true));
     }
   }
   // Querying
   bool is_oop()               { return mask_bits(value(), type_mask_in_place) == oop_value; }
   bool is_value()             { return mask_bits(value(), type_mask_in_place) == value_value; }
   bool is_narrowoop()           { return mask_bits(value(), type_mask_in_place) == narrowoop_value; }
   bool is_callee_saved()      { return mask_bits(value(), type_mask_in_place) == callee_saved_value; }
   bool is_derived_oop()       { return mask_bits(value(), type_mask_in_place) == derived_oop_value; }
   void set_oop()              { set_value((value() & register_mask_in_place) | oop_value); }
   void set_value()            { set_value((value() & register_mask_in_place) | value_value); }
   void set_narrowoop()          { set_value((value() & register_mask_in_place) | narrowoop_value); }
   void set_callee_saved()     { set_value((value() & register_mask_in_place) | callee_saved_value); }
   void set_derived_oop()      { set_value((value() & register_mask_in_place) | derived_oop_value); }
   VMReg reg() const { return VMRegImpl::as_VMReg(mask_bits(value(), register_mask_in_place) >> register_shift); }
   oop_types type() const      { return (oop_types)mask_bits(value(), type_mask_in_place); }
   static bool legal_vm_reg_name(VMReg p) {
     return (p->value()  == (p->value() & register_mask));
   }
   void set_reg_type(VMReg p, oop_types t) {
     set_value((p->value() << register_shift) | t);
     assert(reg() == p, "sanity check" );
     assert(type() == t, "sanity check" );
   }
   VMReg content_reg() const       { return VMRegImpl::as_VMReg(_content_reg, true); }
   void set_content_reg(VMReg r)   { _content_reg = r->value(); }
   // Physical location queries
   bool is_register_loc()      { return reg()->is_reg(); }
   bool is_stack_loc()         { return reg()->is_stack(); }
   // Returns offset from sp.
   int stack_offset() {
     assert(is_stack_loc(), "must be stack location");
     return reg()->reg2stack();
   }
   void print_on(outputStream* st) const;
   void print() const { print_on(tty); }
 };
 class OopMap: public ResourceObj {
   friend class OopMapStream;
   friend class VMStructs;
  private:
   int  _pc_offset;
   int  _omv_count;
   int  _omv_data_size;
   unsigned char* _omv_data;
   CompressedWriteStream* _write_stream;
   debug_only( OopMapValue::oop_types* _locs_used; int _locs_length;)
   // Accessors
   unsigned char* omv_data() const             { return _omv_data; }
   void set_omv_data(unsigned char* value)     { _omv_data = value; }
   int omv_data_size() const                   { return _omv_data_size; }
   void set_omv_data_size(int value)           { _omv_data_size = value; }
   int omv_count() const                       { return _omv_count; }
   void set_omv_count(int value)               { _omv_count = value; }
   void increment_count()                      { _omv_count++; }
   CompressedWriteStream* write_stream() const { return _write_stream; }
   void set_write_stream(CompressedWriteStream* value) { _write_stream = value; }
  private:
   enum DeepCopyToken { _deep_copy_token };
   OopMap(DeepCopyToken, OopMap* source);  // used only by deep_copy
  public:
   OopMap(int frame_size, int arg_count);
   // pc-offset handling
   int offset() const     { return _pc_offset; }
   void set_offset(int o) { _pc_offset = o; }
   // Check to avoid double insertion
   debug_only(OopMapValue::oop_types locs_used( int indx ) { return _locs_used[indx]; })
   // Construction
   // frame_size units are stack-slots (4 bytes) NOT intptr_t; we can name odd
   // slots to hold 4-byte values like ints and floats in the LP64 build.
   void set_oop  ( VMReg local);
   void set_value( VMReg local);
   void set_narrowoop(VMReg local);
   void set_dead ( VMReg local);
   void set_callee_saved( VMReg local, VMReg caller_machine_register );
   void set_derived_oop ( VMReg local, VMReg derived_from_local_register );
   void set_xxx(VMReg reg, OopMapValue::oop_types x, VMReg optional);
   int heap_size() const;
   void copy_to(address addr);
   OopMap* deep_copy();
   bool has_derived_pointer() const PRODUCT_RETURN0;
   bool legal_vm_reg_name(VMReg local) {
      return OopMapValue::legal_vm_reg_name(local);
   }
   // Printing
   void print_on(outputStream* st) const;
   void print() const { print_on(tty); }
 };
 class OopMapSet : public ResourceObj {
   friend class VMStructs;
  private:
   int _om_count;
   int _om_size;
   OopMap** _om_data;
   int om_count() const              { return _om_count; }
   void set_om_count(int value)      { _om_count = value; }
   void increment_count()            { _om_count++; }
   int om_size() const               { return _om_size; }
   void set_om_size(int value)       { _om_size = value; }
   OopMap** om_data() const          { return _om_data; }
   void set_om_data(OopMap** value)  { _om_data = value; }
   void grow_om_data();
   void set(int index,OopMap* value) { assert((index == 0) || ((index > 0) && (index < om_size())),"bad index"); _om_data[index] = value; }
  public:
   OopMapSet();
   // returns the number of OopMaps in this OopMapSet
   int size() const            { return _om_count; }
   // returns the OopMap at a given index
   OopMap* at(int index) const { assert((index >= 0) && (index <= om_count()),"bad index"); return _om_data[index]; }
   // Collect OopMaps.
   void add_gc_map(int pc, OopMap* map);
   // Returns the only oop map. Used for reconstructing
   // Adapter frames during deoptimization
   OopMap* singular_oop_map();
   // returns OopMap in that is anchored to the pc
   OopMap* find_map_at_offset(int pc_offset) const;
   int heap_size() const;
   void copy_to(address addr);
   // Methods oops_do() and all_do() filter out NULL oops and
   // oop == Universe::narrow_oop_base() before passing oops
   // to closures.
   // Iterates through frame for a compiled method
   static void oops_do            (const frame* fr,
                                   const RegisterMap* reg_map, OopClosure* f);
   static void update_register_map(const frame* fr, RegisterMap *reg_map);
   // Iterates through frame for a compiled method for dead ones and values, too
   static void all_do(const frame* fr, const RegisterMap* reg_map,
                      OopClosure* oop_fn,
                      void derived_oop_fn(oop* base, oop* derived),
                      OopClosure* value_fn);
   // Printing
   void print_on(outputStream* st) const;
   void print() const { print_on(tty); }
 };
 class OopMapStream : public StackObj {
  private:
   CompressedReadStream* _stream;
   int _mask;
   int _size;
   int _position;
   bool _valid_omv;
   OopMapValue _omv;
   void find_next();
  public:
   OopMapStream(OopMap* oop_map);
   OopMapStream(OopMap* oop_map, int oop_types_mask);
   bool is_done()                        { if(!_valid_omv) { find_next(); } return !_valid_omv; }
   void next()                           { find_next(); }
   OopMapValue current()                 { return _omv; }
 };
 // Derived pointer support. This table keeps track of all derived points on a
 // stack.  It is cleared before each scavenge/GC.  During the traversal of all
 // oops, it is filled in with references to all locations that contains a
 // derived oop (assumed to be very few).  When the GC is complete, the derived
 // pointers are updated based on their base pointers new value and an offset.
 #ifdef COMPILER2
 class DerivedPointerTable : public AllStatic {
   friend class VMStructs;
  private:
    static GrowableArray<DerivedPointerEntry*>* _list;
    static bool _active;                      // do not record pointers for verify pass etc.
  public:
   static void clear();                       // Called before scavenge/GC
   static void add(oop *derived, oop *base);  // Called during scavenge/GC
   static void update_pointers();             // Called after  scavenge/GC
   static bool is_empty()                     { return _list == NULL || _list->is_empty(); }
   static bool is_active()                    { return _active; }
   static void set_active(bool value)         { _active = value; }
 };
 // A utility class to temporarily "deactivate" the DerivedPointerTable.
 // (Note: clients are responsible for any MT-safety issues)
 class DerivedPointerTableDeactivate: public StackObj {
  private:
   bool _active;
  public:
   DerivedPointerTableDeactivate() {
     _active = DerivedPointerTable::is_active();
     if (_active) {
       DerivedPointerTable::set_active(false);
     }
   }
   ~DerivedPointerTableDeactivate() {
     assert(!DerivedPointerTable::is_active(),
            "Inconsistency: not MT-safe");
     if (_active) {
       DerivedPointerTable::set_active(true);
     }
   }
 };
 #endif // COMPILER2

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/compiler/oopMap.hpp@c18cbe5936b8 (annotated)

src/share/vm/compiler/oopMap.hpp