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 if (p->is_FlagsProj()) {
58 FlagsProjNode *proj = p->as_FlagsProj();
59 if (proj->_con == which_proj) {
60 return proj;
61 }
62 } else {
63 assert(p == this && this->is_Start(), "else must be proj");
64 continue;
65 }
66 }
67 return NULL;
68 }
69
70 //=============================================================================
71 //------------------------------ProjNode---------------------------------------
72 uint ProjNode::hash() const {
73 // only one input
74 return (uintptr_t)in(TypeFunc::Control) + (_con << 1) + (_is_io_use ? 1 : 0);
75 }
76 uint ProjNode::cmp( const Node &n ) const { return _con == ((ProjNode&)n)._con && ((ProjNode&)n)._is_io_use == _is_io_use; }
77 uint ProjNode::size_of() const { return sizeof(ProjNode); }
78
79 // Test if we propagate interesting control along this projection
80 bool ProjNode::is_CFG() const {
81 Node *def = in(0);
82 return (_con == TypeFunc::Control && def->is_CFG());
83 }
84
85 const Type* ProjNode::proj_type(const Type* t) const {
86 if (t == Type::TOP) {
87 return Type::TOP;
88 }
89 if (t == Type::BOTTOM) {
90 return Type::BOTTOM;
91 }
92 t = t->is_tuple()->field_at(_con);
93 Node* n = in(0);
94 if ((_con == TypeFunc::Parms) &&
95 n->is_CallStaticJava() && n->as_CallStaticJava()->is_boxing_method()) {
96 // The result of autoboxing is always non-null on normal path.
97 t = t->join_speculative(TypePtr::NOTNULL);
98 }
99 return t;
100 }
101
102 const Type *ProjNode::bottom_type() const {
103 if (in(0) == NULL) return Type::TOP;
104 return proj_type(in(0)->bottom_type());
105 }
106
107 const TypePtr *ProjNode::adr_type() const {
108 if (bottom_type() == Type::MEMORY) {
109 // in(0) might be a narrow MemBar; otherwise we will report TypePtr::BOTTOM
110 const TypePtr* adr_type = in(0)->adr_type();
111 #ifdef ASSERT
112 if (!is_error_reported() && !Node::in_dump())
113 assert(adr_type != NULL, "source must have adr_type");
114 #endif
115 return adr_type;
116 }
117 assert(bottom_type()->base() != Type::Memory, "no other memories?");
118 return NULL;
119 }
120
121 bool ProjNode::pinned() const { return in(0)->pinned(); }
122 #ifndef PRODUCT
123 void ProjNode::dump_spec(outputStream *st) const { st->print("#%d",_con); if(_is_io_use) st->print(" (i_o_use)");}
124 #endif
125
126 //----------------------------check_con----------------------------------------
127 void ProjNode::check_con() const {
128 Node* n = in(0);
129 if (n == NULL) return; // should be assert, but NodeHash makes bogons
130 if (n->is_Mach()) return; // mach. projs. are not type-safe
131 if (n->is_Start()) return; // alas, starts can have mach. projs. also
132 if (_con == SCMemProjNode::SCMEMPROJCON ) return;
133 const Type* t = n->bottom_type();
134 if (t == Type::TOP) return; // multi is dead
135 assert(_con < t->is_tuple()->cnt(), "ProjNode::_con must be in range");
136 }
137
138 //------------------------------Value------------------------------------------
139 const Type *ProjNode::Value( PhaseTransform *phase ) const {
140 if (in(0) == NULL) return Type::TOP;
141 return proj_type(phase->type(in(0)));
142 }
143
144 //------------------------------out_RegMask------------------------------------
145 // Pass the buck uphill
146 const RegMask &ProjNode::out_RegMask() const {
147 return RegMask::Empty;
148 }
149
150 //------------------------------ideal_reg--------------------------------------
151 uint ProjNode::ideal_reg() const {
152 return bottom_type()->ideal_reg();
153 }
154
155 //-------------------------------is_uncommon_trap_proj----------------------------
156 // Return true if proj is the form of "proj->[region->..]call_uct"
157 bool ProjNode::is_uncommon_trap_proj(Deoptimization::DeoptReason reason) {
158 int path_limit = 10;
159 Node* out = this;
160 for (int ct = 0; ct < path_limit; ct++) {
161 out = out->unique_ctrl_out();
162 if (out == NULL)
163 return false;
164 if (out->is_CallStaticJava()) {
165 int req = out->as_CallStaticJava()->uncommon_trap_request();
166 if (req != 0) {
167 Deoptimization::DeoptReason trap_reason = Deoptimization::trap_request_reason(req);
168 if (trap_reason == reason || reason == Deoptimization::Reason_none) {
169 return true;
170 }
171 }
172 return false; // don't do further after call
173 }
174 if (out->Opcode() != Op_Region)
175 return false;
176 }
177 return false;
178 }
179
180 //-------------------------------is_uncommon_trap_if_pattern-------------------------
181 // Return true for "if(test)-> proj -> ...
182 // |
183 // V
184 // other_proj->[region->..]call_uct"
185 //
186 // "must_reason_predicate" means the uct reason must be Reason_predicate
187 bool ProjNode::is_uncommon_trap_if_pattern(Deoptimization::DeoptReason reason) {
188 Node *in0 = in(0);
189 if (!in0->is_If()) return false;
190 // Variation of a dead If node.
191 if (in0->outcnt() < 2) return false;
192 IfNode* iff = in0->as_If();
193
194 // we need "If(Conv2B(Opaque1(...)))" pattern for reason_predicate
195 if (reason != Deoptimization::Reason_none) {
196 if (iff->in(1)->Opcode() != Op_Conv2B ||
197 iff->in(1)->in(1)->Opcode() != Op_Opaque1) {
198 return false;
199 }
200 }
201
202 ProjNode* other_proj = iff->proj_out(1-_con)->as_Proj();
203 if (other_proj->is_uncommon_trap_proj(reason)) {
204 assert(reason == Deoptimization::Reason_none ||
205 Compile::current()->is_predicate_opaq(iff->in(1)->in(1)), "should be on the list");
206 return true;
207 }
208 return false;
209 }