Mercurial > hg > truffle
view src/share/vm/opto/multnode.cpp @ 1994:6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
7002546: regression on SpecJbb2005 on 7b118 comparing to 7b117 on small heaps
Summary: Relaxed assertion checking related to incremental_collection_failed flag to allow for ExplicitGCInvokesConcurrent behaviour where we do not want a failing scavenge to bail to a stop-world collection. Parameterized incremental_collection_will_fail() so we can selectively use, or not use, as appropriate, the statistical prediction at specific use sites. This essentially reverts the scavenge bail-out logic to what it was prior to some recent changes that had inadvertently started using the statistical prediction which can be noisy in the presence of bursty loads. Added some associated verbose non-product debugging messages.
Reviewed-by: johnc, tonyp
author | ysr |
---|---|
date | Tue, 07 Dec 2010 21:55:53 -0800 |
parents | f95d63e2154a |
children | da91efe96a93 |
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/* * Copyright (c) 1997, 2010, 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. * */ #include "precompiled.hpp" #include "opto/matcher.hpp" #include "opto/multnode.hpp" #include "opto/opcodes.hpp" #include "opto/phaseX.hpp" #include "opto/regmask.hpp" #include "opto/type.hpp" //============================================================================= //------------------------------MultiNode-------------------------------------- const RegMask &MultiNode::out_RegMask() const { return RegMask::Empty; } Node *MultiNode::match( const ProjNode *proj, const Matcher *m ) { return proj->clone(); } //------------------------------proj_out--------------------------------------- // Get a named projection ProjNode* MultiNode::proj_out(uint which_proj) const { assert(Opcode() != Op_If || which_proj == (uint)true || which_proj == (uint)false, "must be 1 or 0"); assert(Opcode() != Op_If || outcnt() == 2, "bad if #1"); for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) { Node *p = fast_out(i); if( !p->is_Proj() ) { assert(p == this && this->is_Start(), "else must be proj"); continue; } ProjNode *proj = p->as_Proj(); if( proj->_con == which_proj ) { assert(Opcode() != Op_If || proj->Opcode() == (which_proj?Op_IfTrue:Op_IfFalse), "bad if #2"); return proj; } } return NULL; } //============================================================================= //------------------------------ProjNode--------------------------------------- uint ProjNode::hash() const { // only one input return (uintptr_t)in(TypeFunc::Control) + (_con << 1) + (_is_io_use ? 1 : 0); } uint ProjNode::cmp( const Node &n ) const { return _con == ((ProjNode&)n)._con && ((ProjNode&)n)._is_io_use == _is_io_use; } uint ProjNode::size_of() const { return sizeof(ProjNode); } // Test if we propagate interesting control along this projection bool ProjNode::is_CFG() const { Node *def = in(0); return (_con == TypeFunc::Control && def->is_CFG()); } const Type *ProjNode::bottom_type() const { if (in(0) == NULL) return Type::TOP; const Type *tb = in(0)->bottom_type(); if( tb == Type::TOP ) return Type::TOP; if( tb == Type::BOTTOM ) return Type::BOTTOM; const TypeTuple *t = tb->is_tuple(); return t->field_at(_con); } const TypePtr *ProjNode::adr_type() const { if (bottom_type() == Type::MEMORY) { // in(0) might be a narrow MemBar; otherwise we will report TypePtr::BOTTOM const TypePtr* adr_type = in(0)->adr_type(); #ifdef ASSERT if (!is_error_reported() && !Node::in_dump()) assert(adr_type != NULL, "source must have adr_type"); #endif return adr_type; } assert(bottom_type()->base() != Type::Memory, "no other memories?"); return NULL; } bool ProjNode::pinned() const { return in(0)->pinned(); } #ifndef PRODUCT void ProjNode::dump_spec(outputStream *st) const { st->print("#%d",_con); if(_is_io_use) st->print(" (i_o_use)");} #endif //----------------------------check_con---------------------------------------- void ProjNode::check_con() const { Node* n = in(0); if (n == NULL) return; // should be assert, but NodeHash makes bogons if (n->is_Mach()) return; // mach. projs. are not type-safe if (n->is_Start()) return; // alas, starts can have mach. projs. also if (_con == SCMemProjNode::SCMEMPROJCON ) return; const Type* t = n->bottom_type(); if (t == Type::TOP) return; // multi is dead assert(_con < t->is_tuple()->cnt(), "ProjNode::_con must be in range"); } //------------------------------Value------------------------------------------ const Type *ProjNode::Value( PhaseTransform *phase ) const { if( !in(0) ) return Type::TOP; const Type *t = phase->type(in(0)); if( t == Type::TOP ) return t; if( t == Type::BOTTOM ) return t; return t->is_tuple()->field_at(_con); } //------------------------------out_RegMask------------------------------------ // Pass the buck uphill const RegMask &ProjNode::out_RegMask() const { return RegMask::Empty; } //------------------------------ideal_reg-------------------------------------- uint ProjNode::ideal_reg() const { return Matcher::base2reg[bottom_type()->base()]; }