1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "opto/callnode.hpp"
27 #include "opto/cfgnode.hpp"
28 #include "opto/matcher.hpp"
29 #include "opto/mathexactnode.hpp"
30 #include "opto/multnode.hpp"
31 #include "opto/opcodes.hpp"
32 #include "opto/phaseX.hpp"
33 #include "opto/regmask.hpp"
34 #include "opto/type.hpp"
35
36 //=============================================================================
37 //------------------------------MultiNode--------------------------------------
38 const RegMask &MultiNode::out_RegMask() const {
39 return RegMask::Empty;
40 }
41
42 Node *MultiNode::match( const ProjNode *proj, const Matcher *m ) { return proj->clone(); }
43
44 //------------------------------proj_out---------------------------------------
45 // Get a named projection
46 ProjNode* MultiNode::proj_out(uint which_proj) const {
47 assert(Opcode() != Op_If || which_proj == (uint)true || which_proj == (uint)false, "must be 1 or 0");
48 assert(Opcode() != Op_If || outcnt() == 2, "bad if #1");
49 for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) {
50 Node *p = fast_out(i);
51 if (p->is_Proj()) {
52 ProjNode *proj = p->as_Proj();
53 if (proj->_con == which_proj) {
54 assert(Opcode() != Op_If || proj->Opcode() == (which_proj?Op_IfTrue:Op_IfFalse), "bad if #2");
55 return proj;
56 }
57 } else {
58 assert(p == this && this->is_Start(), "else must be proj");
59 continue;
60 }
61 }
62 return NULL;
63 }
64
65 //=============================================================================
66 //------------------------------ProjNode---------------------------------------
67 uint ProjNode::hash() const {
68 // only one input
69 return (uintptr_t)in(TypeFunc::Control) + (_con << 1) + (_is_io_use ? 1 : 0);
70 }
71 uint ProjNode::cmp( const Node &n ) const { return _con == ((ProjNode&)n)._con && ((ProjNode&)n)._is_io_use == _is_io_use; }
72 uint ProjNode::size_of() const { return sizeof(ProjNode); }
73
74 // Test if we propagate interesting control along this projection
75 bool ProjNode::is_CFG() const {
76 Node *def = in(0);
77 return (_con == TypeFunc::Control && def->is_CFG());
78 }
79
80 const Type* ProjNode::proj_type(const Type* t) const {
81 if (t == Type::TOP) {
82 return Type::TOP;
83 }
84 if (t == Type::BOTTOM) {
85 return Type::BOTTOM;
86 }
87 t = t->is_tuple()->field_at(_con);
88 Node* n = in(0);
89 if ((_con == TypeFunc::Parms) &&
90 n->is_CallStaticJava() && n->as_CallStaticJava()->is_boxing_method()) {
91 // The result of autoboxing is always non-null on normal path.
92 t = t->join(TypePtr::NOTNULL);
93 }
94 return t;
95 }
96
97 const Type *ProjNode::bottom_type() const {
98 if (in(0) == NULL) return Type::TOP;
99 return proj_type(in(0)->bottom_type());
100 }
101
102 const TypePtr *ProjNode::adr_type() const {
103 if (bottom_type() == Type::MEMORY) {
104 // in(0) might be a narrow MemBar; otherwise we will report TypePtr::BOTTOM
105 const TypePtr* adr_type = in(0)->adr_type();
106 #ifdef ASSERT
107 if (!is_error_reported() && !Node::in_dump())
108 assert(adr_type != NULL, "source must have adr_type");
109 #endif
110 return adr_type;
111 }
112 assert(bottom_type()->base() != Type::Memory, "no other memories?");
113 return NULL;
114 }
115
116 bool ProjNode::pinned() const { return in(0)->pinned(); }
117 #ifndef PRODUCT
118 void ProjNode::dump_spec(outputStream *st) const { st->print("#%d",_con); if(_is_io_use) st->print(" (i_o_use)");}
119 #endif
120
121 //----------------------------check_con----------------------------------------
122 void ProjNode::check_con() const {
123 Node* n = in(0);
124 if (n == NULL) return; // should be assert, but NodeHash makes bogons
125 if (n->is_Mach()) return; // mach. projs. are not type-safe
126 if (n->is_Start()) return; // alas, starts can have mach. projs. also
127 if (_con == SCMemProjNode::SCMEMPROJCON ) return;
128 const Type* t = n->bottom_type();
129 if (t == Type::TOP) return; // multi is dead
130 assert(_con < t->is_tuple()->cnt(), "ProjNode::_con must be in range");
131 }
132
133 //------------------------------Value------------------------------------------
134 const Type *ProjNode::Value( PhaseTransform *phase ) const {
135 if (in(0) == NULL) return Type::TOP;
136 return proj_type(phase->type(in(0)));
137 }
138
139 //------------------------------out_RegMask------------------------------------
140 // Pass the buck uphill
141 const RegMask &ProjNode::out_RegMask() const {
142 return RegMask::Empty;
143 }
144
145 //------------------------------ideal_reg--------------------------------------
146 uint ProjNode::ideal_reg() const {
147 return bottom_type()->ideal_reg();
148 }
149
150 //-------------------------------is_uncommon_trap_proj----------------------------
151 // Return true if proj is the form of "proj->[region->..]call_uct"
152 bool ProjNode::is_uncommon_trap_proj(Deoptimization::DeoptReason reason) {
153 int path_limit = 10;
154 Node* out = this;
155 for (int ct = 0; ct < path_limit; ct++) {
156 out = out->unique_ctrl_out();
157 if (out == NULL)
158 return false;
159 if (out->is_CallStaticJava()) {
160 int req = out->as_CallStaticJava()->uncommon_trap_request();
161 if (req != 0) {
162 Deoptimization::DeoptReason trap_reason = Deoptimization::trap_request_reason(req);
163 if (trap_reason == reason || reason == Deoptimization::Reason_none) {
164 return true;
165 }
166 }
167 return false; // don't do further after call
168 }
169 if (out->Opcode() != Op_Region)
170 return false;
171 }
172 return false;
173 }
174
175 //-------------------------------is_uncommon_trap_if_pattern-------------------------
176 // Return true for "if(test)-> proj -> ...
177 // |
178 // V
179 // other_proj->[region->..]call_uct"
180 //
181 // "must_reason_predicate" means the uct reason must be Reason_predicate
182 bool ProjNode::is_uncommon_trap_if_pattern(Deoptimization::DeoptReason reason) {
183 Node *in0 = in(0);
184 if (!in0->is_If()) return false;
185 // Variation of a dead If node.
186 if (in0->outcnt() < 2) return false;
187 IfNode* iff = in0->as_If();
188
189 // we need "If(Conv2B(Opaque1(...)))" pattern for reason_predicate
190 if (reason != Deoptimization::Reason_none) {
191 if (iff->in(1)->Opcode() != Op_Conv2B ||
192 iff->in(1)->in(1)->Opcode() != Op_Opaque1) {
193 return false;
194 }
195 }
196
197 ProjNode* other_proj = iff->proj_out(1-_con)->as_Proj();
198 if (other_proj->is_uncommon_trap_proj(reason)) {
199 assert(reason == Deoptimization::Reason_none ||
200 Compile::current()->is_predicate_opaq(iff->in(1)->in(1)), "should be on the list");
201 return true;
202 }
203 return false;
204 }