jdk8-mips64-public/hotspot: src/share/vm/opto/live.cpp@98cb887364d3 (annotated)

src/share/vm/opto/live.cpp@98cb887364d3 (annotated)

src/share/vm/opto/live.cpp

Fri, 27 Feb 2009 13:27:09 -0800

author: twisti
date: Fri, 27 Feb 2009 13:27:09 -0800
changeset 1040: 98cb887364d3
parent 1001: 91263420e1c6
child 1063: 7bb995fbd3c0
permissions: -rw-r--r--

6810672: Comment typos
Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never

 /*
  * Copyright 1997-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_live.cpp.incl"
 //=============================================================================
 //------------------------------PhaseLive--------------------------------------
 // Compute live-in/live-out.  We use a totally incremental algorithm.  The LIVE
 // problem is monotonic.  The steady-state solution looks like this: pull a
 // block from the worklist.  It has a set of delta's - values which are newly
 // live-in from the block.  Push these to the live-out sets of all predecessor
 // blocks.  At each predecessor, the new live-out values are ANDed with what is
 // already live-out (extra stuff is added to the live-out sets).  Then the
 // remaining new live-out values are ANDed with what is locally defined.
 // Leftover bits become the new live-in for the predecessor block, and the pred
 // block is put on the worklist.
 //   The locally live-in stuff is computed once and added to predecessor
 // live-out sets.  This separate compilation is done in the outer loop below.
 PhaseLive::PhaseLive( const PhaseCFG &cfg, LRG_List &names, Arena *arena ) : Phase(LIVE), _cfg(cfg), _names(names), _arena(arena), _live(0) {
 }
 void PhaseLive::compute(uint maxlrg) {
   _maxlrg   = maxlrg;
   _worklist = new (_arena) Block_List();
   // Init the sparse live arrays.  This data is live on exit from here!
   // The _live info is the live-out info.
   _live = (IndexSet*)_arena->Amalloc(sizeof(IndexSet)*_cfg._num_blocks);
   uint i;
   for( i=0; i<_cfg._num_blocks; i++ ) {
     _live[i].initialize(_maxlrg);
   }
   // Init the sparse arrays for delta-sets.
   ResourceMark rm;              // Nuke temp storage on exit
   // Does the memory used by _defs and _deltas get reclaimed?  Does it matter?  TT
   // Array of values defined locally in blocks
   _defs = NEW_RESOURCE_ARRAY(IndexSet,_cfg._num_blocks);
   for( i=0; i<_cfg._num_blocks; i++ ) {
     _defs[i].initialize(_maxlrg);
   }
   // Array of delta-set pointers, indexed by block pre_order-1.
   _deltas = NEW_RESOURCE_ARRAY(IndexSet*,_cfg._num_blocks);
   memset( _deltas, 0, sizeof(IndexSet*)* _cfg._num_blocks);
   _free_IndexSet = NULL;
   // Blocks having done pass-1
   VectorSet first_pass(Thread::current()->resource_area());
   // Outer loop: must compute local live-in sets and push into predecessors.
   uint iters = _cfg._num_blocks;        // stat counters
   for( uint j=_cfg._num_blocks; j>0; j-- ) {
     Block *b = _cfg._blocks[j-1];
     // Compute the local live-in set.  Start with any new live-out bits.
     IndexSet *use = getset( b );
     IndexSet *def = &_defs[b->_pre_order-1];
     DEBUG_ONLY(IndexSet *def_outside = getfreeset();)
     uint i;
     for( i=b->_nodes.size(); i>1; i-- ) {
       Node *n = b->_nodes[i-1];
       if( n->is_Phi() ) break;
       uint r = _names[n->_idx];
       assert(!def_outside->member(r), "Use of external LRG overlaps the same LRG defined in this block");
       def->insert( r );
       use->remove( r );
       uint cnt = n->req();
       for( uint k=1; k<cnt; k++ ) {
         Node *nk = n->in(k);
         uint nkidx = nk->_idx;
         if( _cfg._bbs[nkidx] != b ) {
           uint u = _names[nkidx];
           use->insert( u );
           DEBUG_ONLY(def_outside->insert( u );)
         }
       }
     }
 #ifdef ASSERT
     def_outside->set_next(_free_IndexSet);
     _free_IndexSet = def_outside;     // Drop onto free list
 #endif
     // Remove anything defined by Phis and the block start instruction
     for( uint k=i; k>0; k-- ) {
       uint r = _names[b->_nodes[k-1]->_idx];
       def->insert( r );
       use->remove( r );
     }
     // Push these live-in things to predecessors
     for( uint l=1; l<b->num_preds(); l++ ) {
       Block *p = _cfg._bbs[b->pred(l)->_idx];
       add_liveout( p, use, first_pass );
       // PhiNode uses go in the live-out set of prior blocks.
       for( uint k=i; k>0; k-- )
         add_liveout( p, _names[b->_nodes[k-1]->in(l)->_idx], first_pass );
     }
     freeset( b );
     first_pass.set(b->_pre_order);
     // Inner loop: blocks that picked up new live-out values to be propagated
     while( _worklist->size() ) {
         // !!!!!
 // #ifdef ASSERT
       iters++;
 // #endif
       Block *b = _worklist->pop();
       IndexSet *delta = getset(b);
       assert( delta->count(), "missing delta set" );
       // Add new-live-in to predecessors live-out sets
       for( uint l=1; l<b->num_preds(); l++ )
         add_liveout( _cfg._bbs[b->pred(l)->_idx], delta, first_pass );
       freeset(b);
     } // End of while-worklist-not-empty
   } // End of for-all-blocks-outer-loop
   // We explicitly clear all of the IndexSets which we are about to release.
   // This allows us to recycle their internal memory into IndexSet's free list.
   for( i=0; i<_cfg._num_blocks; i++ ) {
     _defs[i].clear();
     if (_deltas[i]) {
       // Is this always true?
       _deltas[i]->clear();
     }
   }
   IndexSet *free = _free_IndexSet;
   while (free != NULL) {
     IndexSet *temp = free;
     free = free->next();
     temp->clear();
   }
 }
 //------------------------------stats------------------------------------------
 #ifndef PRODUCT
 void PhaseLive::stats(uint iters) const {
 }
 #endif
 //------------------------------getset-----------------------------------------
 // Get an IndexSet for a block.  Return existing one, if any.  Make a new
 // empty one if a prior one does not exist.
 IndexSet *PhaseLive::getset( Block *p ) {
   IndexSet *delta = _deltas[p->_pre_order-1];
   if( !delta )                  // Not on worklist?
     // Get a free set; flag as being on worklist
     delta = _deltas[p->_pre_order-1] = getfreeset();
   return delta;                 // Return set of new live-out items
 }
 //------------------------------getfreeset-------------------------------------
 // Pull from free list, or allocate.  Internal allocation on the returned set
 // is always from thread local storage.
 IndexSet *PhaseLive::getfreeset( ) {
   IndexSet *f = _free_IndexSet;
   if( !f ) {
     f = new IndexSet;
 //    f->set_arena(Thread::current()->resource_area());
     f->initialize(_maxlrg, Thread::current()->resource_area());
   } else {
     // Pull from free list
     _free_IndexSet = f->next();
   //f->_cnt = 0;                        // Reset to empty
 //    f->set_arena(Thread::current()->resource_area());
     f->initialize(_maxlrg, Thread::current()->resource_area());
   }
   return f;
 }
 //------------------------------freeset----------------------------------------
 // Free an IndexSet from a block.
 void PhaseLive::freeset( const Block *p ) {
   IndexSet *f = _deltas[p->_pre_order-1];
   f->set_next(_free_IndexSet);
   _free_IndexSet = f;           // Drop onto free list
   _deltas[p->_pre_order-1] = NULL;
 }
 //------------------------------add_liveout------------------------------------
 // Add a live-out value to a given blocks live-out set.  If it is new, then
 // also add it to the delta set and stick the block on the worklist.
 void PhaseLive::add_liveout( Block *p, uint r, VectorSet &first_pass ) {
   IndexSet *live = &_live[p->_pre_order-1];
   if( live->insert(r) ) {       // If actually inserted...
     // We extended the live-out set.  See if the value is generated locally.
     // If it is not, then we must extend the live-in set.
     if( !_defs[p->_pre_order-1].member( r ) ) {
       if( !_deltas[p->_pre_order-1] && // Not on worklist?
           first_pass.test(p->_pre_order) )
         _worklist->push(p);     // Actually go on worklist if already 1st pass
       getset(p)->insert(r);
     }
   }
 }
 //------------------------------add_liveout------------------------------------
 // Add a vector of live-out values to a given blocks live-out set.
 void PhaseLive::add_liveout( Block *p, IndexSet *lo, VectorSet &first_pass ) {
   IndexSet *live = &_live[p->_pre_order-1];
   IndexSet *defs = &_defs[p->_pre_order-1];
   IndexSet *on_worklist = _deltas[p->_pre_order-1];
   IndexSet *delta = on_worklist ? on_worklist : getfreeset();
   IndexSetIterator elements(lo);
   uint r;
   while ((r = elements.next()) != 0) {
     if( live->insert(r) &&      // If actually inserted...
         !defs->member( r ) )    // and not defined locally
       delta->insert(r);         // Then add to live-in set
   }
   if( delta->count() ) {                // If actually added things
     _deltas[p->_pre_order-1] = delta; // Flag as on worklist now
     if( !on_worklist &&         // Not on worklist?
         first_pass.test(p->_pre_order) )
       _worklist->push(p);       // Actually go on worklist if already 1st pass
   } else {                      // Nothing there; just free it
     delta->set_next(_free_IndexSet);
     _free_IndexSet = delta;     // Drop onto free list
   }
 }
 #ifndef PRODUCT
 //------------------------------dump-------------------------------------------
 // Dump the live-out set for a block
 void PhaseLive::dump( const Block *b ) const {
   tty->print("Block %d: ",b->_pre_order);
   tty->print("LiveOut: ");  _live[b->_pre_order-1].dump();
   uint cnt = b->_nodes.size();
   for( uint i=0; i<cnt; i++ ) {
     tty->print("L%d/", _names[b->_nodes[i]->_idx] );
     b->_nodes[i]->dump();
   }
   tty->print("\n");
 }
 //------------------------------verify_base_ptrs-------------------------------
 // Verify that base pointers and derived pointers are still sane.
 void PhaseChaitin::verify_base_ptrs( ResourceArea *a ) const {
 #ifdef ASSERT
   Unique_Node_List worklist(a);
   for( uint i = 0; i < _cfg._num_blocks; i++ ) {
     Block *b = _cfg._blocks[i];
     for( uint j = b->end_idx() + 1; j > 1; j-- ) {
       Node *n = b->_nodes[j-1];
       if( n->is_Phi() ) break;
       // Found a safepoint?
       if( n->is_MachSafePoint() ) {
         MachSafePointNode *sfpt = n->as_MachSafePoint();
         JVMState* jvms = sfpt->jvms();
         if (jvms != NULL) {
           // Now scan for a live derived pointer
           if (jvms->oopoff() < sfpt->req()) {
             // Check each derived/base pair
             for (uint idx = jvms->oopoff(); idx < sfpt->req(); idx++) {
               Node *check = sfpt->in(idx);
               bool is_derived = ((idx - jvms->oopoff()) & 1) == 0;
               // search upwards through spills and spill phis for AddP
               worklist.clear();
               worklist.push(check);
               uint k = 0;
               while( k < worklist.size() ) {
                 check = worklist.at(k);
                 assert(check,"Bad base or derived pointer");
                 // See PhaseChaitin::find_base_for_derived() for all cases.
                 int isc = check->is_Copy();
                 if( isc ) {
                   worklist.push(check->in(isc));
                 } else if( check->is_Phi() ) {
                   for (uint m = 1; m < check->req(); m++)
                     worklist.push(check->in(m));
                 } else if( check->is_Con() ) {
                   if (is_derived) {
                     // Derived is NULL+offset
                     assert(!is_derived || check->bottom_type()->is_ptr()->ptr() == TypePtr::Null,"Bad derived pointer");
                   } else {
                     assert(check->bottom_type()->is_ptr()->_offset == 0,"Bad base pointer");
                     // Base either ConP(NULL) or loadConP
                     if (check->is_Mach()) {
                       assert(check->as_Mach()->ideal_Opcode() == Op_ConP,"Bad base pointer");
                     } else {
                       assert(check->Opcode() == Op_ConP &&
                              check->bottom_type()->is_ptr()->ptr() == TypePtr::Null,"Bad base pointer");
                     }
                   }
                 } else if( check->bottom_type()->is_ptr()->_offset == 0 ) {
                   if(check->is_Proj() || check->is_Mach() &&
                      (check->as_Mach()->ideal_Opcode() == Op_CreateEx ||
                       check->as_Mach()->ideal_Opcode() == Op_ThreadLocal ||
                       check->as_Mach()->ideal_Opcode() == Op_CMoveP ||
                       check->as_Mach()->ideal_Opcode() == Op_CheckCastPP ||
 #ifdef _LP64
                       UseCompressedOops && check->as_Mach()->ideal_Opcode() == Op_CastPP ||
                       UseCompressedOops && check->as_Mach()->ideal_Opcode() == Op_DecodeN ||
 #endif
                       check->as_Mach()->ideal_Opcode() == Op_LoadP ||
                       check->as_Mach()->ideal_Opcode() == Op_LoadKlass)) {
                     // Valid nodes
                   } else {
                     check->dump();
                     assert(false,"Bad base or derived pointer");
                   }
                 } else {
                   assert(is_derived,"Bad base pointer");
                   assert(check->is_Mach() && check->as_Mach()->ideal_Opcode() == Op_AddP,"Bad derived pointer");
                 }
                 k++;
                 assert(k < 100000,"Derived pointer checking in infinite loop");
               } // End while
             }
           } // End of check for derived pointers
         } // End of Kcheck for debug info
       } // End of if found a safepoint
     } // End of forall instructions in block
   } // End of forall blocks
 #endif
 }
 //------------------------------verify-------------------------------------
 // Verify that graphs and base pointers are still sane.
 void PhaseChaitin::verify( ResourceArea *a, bool verify_ifg ) const {
 #ifdef ASSERT
   if( VerifyOpto || VerifyRegisterAllocator ) {
     _cfg.verify();
     verify_base_ptrs(a);
     if(verify_ifg)
       _ifg->verify(this);
   }
 #endif
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/live.cpp@98cb887364d3 (annotated)

src/share/vm/opto/live.cpp