Mercurial > hg > truffle
diff src/share/vm/opto/live.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 96964ebdb154 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/opto/live.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,314 @@ +/* + * 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 seperate 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. +// Basically, if a derived pointer is live at a safepoint, then its +// base pointer must be live also. +void PhaseChaitin::verify_base_ptrs( ResourceArea *a ) const { + 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 += 2) { + Node *check = sfpt->in(idx); + uint j = 0; + // search upwards through spills and spill phis for AddP + while(true) { + if( !check ) break; + int idx = check->is_Copy(); + if( idx ) { + check = check->in(idx); + } else if( check->is_Phi() && check->_idx >= _oldphi ) { + check = check->in(1); + } else + break; + j++; + assert(j < 100000,"Derived pointer checking in infinite loop"); + } // End while + assert(check->is_Mach() && check->as_Mach()->ideal_Opcode() == Op_AddP,"Bad derived pointer") + } + } // 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