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/*
* Copyright (c) 1997, 2012, 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/callnode.hpp"
#include "opto/cfgnode.hpp"
#include "opto/matcher.hpp"
#include "opto/mathexactnode.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()) {
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;
}
} else if (p->is_FlagsProj()) {
FlagsProjNode *proj = p->as_FlagsProj();
if (proj->_con == which_proj) {
return proj;
}
} else {
assert(p == this && this->is_Start(), "else must be proj");
continue;
}
}
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::proj_type(const Type* t) const {
if (t == Type::TOP) {
return Type::TOP;
}
if (t == Type::BOTTOM) {
return Type::BOTTOM;
}
t = t->is_tuple()->field_at(_con);
Node* n = in(0);
if ((_con == TypeFunc::Parms) &&
n->is_CallStaticJava() && n->as_CallStaticJava()->is_boxing_method()) {
// The result of autoboxing is always non-null on normal path.
t = t->join(TypePtr::NOTNULL);
}
return t;
}
const Type *ProjNode::bottom_type() const {
if (in(0) == NULL) return Type::TOP;
return proj_type(in(0)->bottom_type());
}
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) == NULL) return Type::TOP;
return proj_type(phase->type(in(0)));
}
//------------------------------out_RegMask------------------------------------
// Pass the buck uphill
const RegMask &ProjNode::out_RegMask() const {
return RegMask::Empty;
}
//------------------------------ideal_reg--------------------------------------
uint ProjNode::ideal_reg() const {
return bottom_type()->ideal_reg();
}
//-------------------------------is_uncommon_trap_proj----------------------------
// Return true if proj is the form of "proj->[region->..]call_uct"
bool ProjNode::is_uncommon_trap_proj(Deoptimization::DeoptReason reason) {
int path_limit = 10;
Node* out = this;
for (int ct = 0; ct < path_limit; ct++) {
out = out->unique_ctrl_out();
if (out == NULL)
return false;
if (out->is_CallStaticJava()) {
int req = out->as_CallStaticJava()->uncommon_trap_request();
if (req != 0) {
Deoptimization::DeoptReason trap_reason = Deoptimization::trap_request_reason(req);
if (trap_reason == reason || reason == Deoptimization::Reason_none) {
return true;
}
}
return false; // don't do further after call
}
if (out->Opcode() != Op_Region)
return false;
}
return false;
}
//-------------------------------is_uncommon_trap_if_pattern-------------------------
// Return true for "if(test)-> proj -> ...
// |
// V
// other_proj->[region->..]call_uct"
//
// "must_reason_predicate" means the uct reason must be Reason_predicate
bool ProjNode::is_uncommon_trap_if_pattern(Deoptimization::DeoptReason reason) {
Node *in0 = in(0);
if (!in0->is_If()) return false;
// Variation of a dead If node.
if (in0->outcnt() < 2) return false;
IfNode* iff = in0->as_If();
// we need "If(Conv2B(Opaque1(...)))" pattern for reason_predicate
if (reason != Deoptimization::Reason_none) {
if (iff->in(1)->Opcode() != Op_Conv2B ||
iff->in(1)->in(1)->Opcode() != Op_Opaque1) {
return false;
}
}
ProjNode* other_proj = iff->proj_out(1-_con)->as_Proj();
if (other_proj->is_uncommon_trap_proj(reason)) {
assert(reason == Deoptimization::Reason_none ||
Compile::current()->is_predicate_opaq(iff->in(1)->in(1)), "should be on the list");
return true;
}
return false;
}
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