Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/memnode.cpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
parents | b5f3a471e646 |
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rev | line source |
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0 | 1 /* |
23614 | 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "compiler/compileLog.hpp" | |
28 #include "memory/allocation.inline.hpp" | |
29 #include "oops/objArrayKlass.hpp" | |
30 #include "opto/addnode.hpp" | |
31 #include "opto/cfgnode.hpp" | |
32 #include "opto/compile.hpp" | |
33 #include "opto/connode.hpp" | |
34 #include "opto/loopnode.hpp" | |
35 #include "opto/machnode.hpp" | |
36 #include "opto/matcher.hpp" | |
37 #include "opto/memnode.hpp" | |
38 #include "opto/mulnode.hpp" | |
39 #include "opto/phaseX.hpp" | |
40 #include "opto/regmask.hpp" | |
41 | |
0 | 42 // Portions of code courtesy of Clifford Click |
43 | |
44 // Optimization - Graph Style | |
45 | |
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46 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st); |
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47 |
0 | 48 //============================================================================= |
49 uint MemNode::size_of() const { return sizeof(*this); } | |
50 | |
51 const TypePtr *MemNode::adr_type() const { | |
52 Node* adr = in(Address); | |
53 const TypePtr* cross_check = NULL; | |
54 DEBUG_ONLY(cross_check = _adr_type); | |
55 return calculate_adr_type(adr->bottom_type(), cross_check); | |
56 } | |
57 | |
58 #ifndef PRODUCT | |
59 void MemNode::dump_spec(outputStream *st) const { | |
60 if (in(Address) == NULL) return; // node is dead | |
61 #ifndef ASSERT | |
62 // fake the missing field | |
63 const TypePtr* _adr_type = NULL; | |
64 if (in(Address) != NULL) | |
65 _adr_type = in(Address)->bottom_type()->isa_ptr(); | |
66 #endif | |
67 dump_adr_type(this, _adr_type, st); | |
68 | |
69 Compile* C = Compile::current(); | |
70 if( C->alias_type(_adr_type)->is_volatile() ) | |
71 st->print(" Volatile!"); | |
72 } | |
73 | |
74 void MemNode::dump_adr_type(const Node* mem, const TypePtr* adr_type, outputStream *st) { | |
75 st->print(" @"); | |
76 if (adr_type == NULL) { | |
77 st->print("NULL"); | |
78 } else { | |
79 adr_type->dump_on(st); | |
80 Compile* C = Compile::current(); | |
81 Compile::AliasType* atp = NULL; | |
82 if (C->have_alias_type(adr_type)) atp = C->alias_type(adr_type); | |
83 if (atp == NULL) | |
84 st->print(", idx=?\?;"); | |
85 else if (atp->index() == Compile::AliasIdxBot) | |
86 st->print(", idx=Bot;"); | |
87 else if (atp->index() == Compile::AliasIdxTop) | |
88 st->print(", idx=Top;"); | |
89 else if (atp->index() == Compile::AliasIdxRaw) | |
90 st->print(", idx=Raw;"); | |
91 else { | |
92 ciField* field = atp->field(); | |
93 if (field) { | |
94 st->print(", name="); | |
95 field->print_name_on(st); | |
96 } | |
97 st->print(", idx=%d;", atp->index()); | |
98 } | |
99 } | |
100 } | |
101 | |
102 extern void print_alias_types(); | |
103 | |
104 #endif | |
105 | |
10278 | 106 Node *MemNode::optimize_simple_memory_chain(Node *mchain, const TypeOopPtr *t_oop, Node *load, PhaseGVN *phase) { |
107 assert((t_oop != NULL), "sanity"); | |
108 bool is_instance = t_oop->is_known_instance_field(); | |
109 bool is_boxed_value_load = t_oop->is_ptr_to_boxed_value() && | |
110 (load != NULL) && load->is_Load() && | |
111 (phase->is_IterGVN() != NULL); | |
112 if (!(is_instance || is_boxed_value_load)) | |
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113 return mchain; // don't try to optimize non-instance types |
10278 | 114 uint instance_id = t_oop->instance_id(); |
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115 Node *start_mem = phase->C->start()->proj_out(TypeFunc::Memory); |
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116 Node *prev = NULL; |
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117 Node *result = mchain; |
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118 while (prev != result) { |
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119 prev = result; |
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120 if (result == start_mem) |
605 | 121 break; // hit one of our sentinels |
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122 // skip over a call which does not affect this memory slice |
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123 if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) { |
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124 Node *proj_in = result->in(0); |
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125 if (proj_in->is_Allocate() && proj_in->_idx == instance_id) { |
605 | 126 break; // hit one of our sentinels |
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127 } else if (proj_in->is_Call()) { |
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128 CallNode *call = proj_in->as_Call(); |
10278 | 129 if (!call->may_modify(t_oop, phase)) { // returns false for instances |
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130 result = call->in(TypeFunc::Memory); |
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131 } |
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132 } else if (proj_in->is_Initialize()) { |
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133 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); |
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134 // Stop if this is the initialization for the object instance which |
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135 // which contains this memory slice, otherwise skip over it. |
10278 | 136 if ((alloc == NULL) || (alloc->_idx == instance_id)) { |
137 break; | |
138 } | |
139 if (is_instance) { | |
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140 result = proj_in->in(TypeFunc::Memory); |
10278 | 141 } else if (is_boxed_value_load) { |
142 Node* klass = alloc->in(AllocateNode::KlassNode); | |
143 const TypeKlassPtr* tklass = phase->type(klass)->is_klassptr(); | |
144 if (tklass->klass_is_exact() && !tklass->klass()->equals(t_oop->klass())) { | |
145 result = proj_in->in(TypeFunc::Memory); // not related allocation | |
146 } | |
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147 } |
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148 } else if (proj_in->is_MemBar()) { |
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149 result = proj_in->in(TypeFunc::Memory); |
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150 } else { |
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151 assert(false, "unexpected projection"); |
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152 } |
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153 } else if (result->is_ClearArray()) { |
10278 | 154 if (!is_instance || !ClearArrayNode::step_through(&result, instance_id, phase)) { |
1100
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155 // Can not bypass initialization of the instance |
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156 // we are looking for. |
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157 break; |
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158 } |
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159 // Otherwise skip it (the call updated 'result' value). |
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160 } else if (result->is_MergeMem()) { |
10278 | 161 result = step_through_mergemem(phase, result->as_MergeMem(), t_oop, NULL, tty); |
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162 } |
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163 } |
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164 return result; |
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165 } |
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166 |
10278 | 167 Node *MemNode::optimize_memory_chain(Node *mchain, const TypePtr *t_adr, Node *load, PhaseGVN *phase) { |
168 const TypeOopPtr* t_oop = t_adr->isa_oopptr(); | |
169 if (t_oop == NULL) | |
170 return mchain; // don't try to optimize non-oop types | |
171 Node* result = optimize_simple_memory_chain(mchain, t_oop, load, phase); | |
172 bool is_instance = t_oop->is_known_instance_field(); | |
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173 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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174 if (is_instance && igvn != NULL && result->is_Phi()) { |
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175 PhiNode *mphi = result->as_Phi(); |
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176 assert(mphi->bottom_type() == Type::MEMORY, "memory phi required"); |
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177 const TypePtr *t = mphi->adr_type(); |
163 | 178 if (t == TypePtr::BOTTOM || t == TypeRawPtr::BOTTOM || |
223 | 179 t->isa_oopptr() && !t->is_oopptr()->is_known_instance() && |
247 | 180 t->is_oopptr()->cast_to_exactness(true) |
181 ->is_oopptr()->cast_to_ptr_type(t_oop->ptr()) | |
182 ->is_oopptr()->cast_to_instance_id(t_oop->instance_id()) == t_oop) { | |
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183 // clone the Phi with our address type |
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184 result = mphi->split_out_instance(t_adr, igvn); |
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185 } else { |
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186 assert(phase->C->get_alias_index(t) == phase->C->get_alias_index(t_adr), "correct memory chain"); |
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187 } |
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188 } |
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189 return result; |
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190 } |
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191 |
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192 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st) { |
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193 uint alias_idx = phase->C->get_alias_index(tp); |
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194 Node *mem = mmem; |
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195 #ifdef ASSERT |
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196 { |
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197 // Check that current type is consistent with the alias index used during graph construction |
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198 assert(alias_idx >= Compile::AliasIdxRaw, "must not be a bad alias_idx"); |
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199 bool consistent = adr_check == NULL || adr_check->empty() || |
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200 phase->C->must_alias(adr_check, alias_idx ); |
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201 // Sometimes dead array references collapse to a[-1], a[-2], or a[-3] |
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202 if( !consistent && adr_check != NULL && !adr_check->empty() && |
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203 tp->isa_aryptr() && tp->offset() == Type::OffsetBot && |
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204 adr_check->isa_aryptr() && adr_check->offset() != Type::OffsetBot && |
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205 ( adr_check->offset() == arrayOopDesc::length_offset_in_bytes() || |
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206 adr_check->offset() == oopDesc::klass_offset_in_bytes() || |
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207 adr_check->offset() == oopDesc::mark_offset_in_bytes() ) ) { |
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208 // don't assert if it is dead code. |
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209 consistent = true; |
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210 } |
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211 if( !consistent ) { |
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212 st->print("alias_idx==%d, adr_check==", alias_idx); |
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213 if( adr_check == NULL ) { |
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214 st->print("NULL"); |
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215 } else { |
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216 adr_check->dump(); |
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217 } |
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218 st->cr(); |
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219 print_alias_types(); |
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220 assert(consistent, "adr_check must match alias idx"); |
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221 } |
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222 } |
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223 #endif |
1815 | 224 // TypeOopPtr::NOTNULL+any is an OOP with unknown offset - generally |
64
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225 // means an array I have not precisely typed yet. Do not do any |
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226 // alias stuff with it any time soon. |
1815 | 227 const TypeOopPtr *toop = tp->isa_oopptr(); |
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228 if( tp->base() != Type::AnyPtr && |
1815 | 229 !(toop && |
230 toop->klass() != NULL && | |
231 toop->klass()->is_java_lang_Object() && | |
232 toop->offset() == Type::OffsetBot) ) { | |
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233 // compress paths and change unreachable cycles to TOP |
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234 // If not, we can update the input infinitely along a MergeMem cycle |
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235 // Equivalent code in PhiNode::Ideal |
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236 Node* m = phase->transform(mmem); |
605 | 237 // If transformed to a MergeMem, get the desired slice |
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238 // Otherwise the returned node represents memory for every slice |
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239 mem = (m->is_MergeMem())? m->as_MergeMem()->memory_at(alias_idx) : m; |
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240 // Update input if it is progress over what we have now |
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241 } |
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242 return mem; |
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243 } |
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244 |
0 | 245 //--------------------------Ideal_common--------------------------------------- |
246 // Look for degenerate control and memory inputs. Bypass MergeMem inputs. | |
247 // Unhook non-raw memories from complete (macro-expanded) initializations. | |
248 Node *MemNode::Ideal_common(PhaseGVN *phase, bool can_reshape) { | |
249 // If our control input is a dead region, kill all below the region | |
250 Node *ctl = in(MemNode::Control); | |
251 if (ctl && remove_dead_region(phase, can_reshape)) | |
252 return this; | |
305 | 253 ctl = in(MemNode::Control); |
254 // Don't bother trying to transform a dead node | |
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255 if (ctl && ctl->is_top()) return NodeSentinel; |
0 | 256 |
708
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257 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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258 // Wait if control on the worklist. |
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259 if (ctl && can_reshape && igvn != NULL) { |
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260 Node* bol = NULL; |
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261 Node* cmp = NULL; |
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262 if (ctl->in(0)->is_If()) { |
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263 assert(ctl->is_IfTrue() || ctl->is_IfFalse(), "sanity"); |
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264 bol = ctl->in(0)->in(1); |
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265 if (bol->is_Bool()) |
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266 cmp = ctl->in(0)->in(1)->in(1); |
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267 } |
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268 if (igvn->_worklist.member(ctl) || |
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269 (bol != NULL && igvn->_worklist.member(bol)) || |
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270 (cmp != NULL && igvn->_worklist.member(cmp)) ) { |
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271 // This control path may be dead. |
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272 // Delay this memory node transformation until the control is processed. |
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273 phase->is_IterGVN()->_worklist.push(this); |
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274 return NodeSentinel; // caller will return NULL |
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275 } |
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276 } |
0 | 277 // Ignore if memory is dead, or self-loop |
278 Node *mem = in(MemNode::Memory); | |
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279 if (phase->type( mem ) == Type::TOP) return NodeSentinel; // caller will return NULL |
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280 assert(mem != this, "dead loop in MemNode::Ideal"); |
0 | 281 |
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282 if (can_reshape && igvn != NULL && igvn->_worklist.member(mem)) { |
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283 // This memory slice may be dead. |
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284 // Delay this mem node transformation until the memory is processed. |
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285 phase->is_IterGVN()->_worklist.push(this); |
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286 return NodeSentinel; // caller will return NULL |
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287 } |
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288 |
0 | 289 Node *address = in(MemNode::Address); |
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290 const Type *t_adr = phase->type(address); |
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291 if (t_adr == Type::TOP) return NodeSentinel; // caller will return NULL |
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292 |
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293 if (can_reshape && igvn != NULL && |
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294 (igvn->_worklist.member(address) || |
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295 igvn->_worklist.size() > 0 && (t_adr != adr_type())) ) { |
420
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296 // The address's base and type may change when the address is processed. |
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297 // Delay this mem node transformation until the address is processed. |
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298 phase->is_IterGVN()->_worklist.push(this); |
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299 return NodeSentinel; // caller will return NULL |
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300 } |
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301 |
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302 // Do NOT remove or optimize the next lines: ensure a new alias index |
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303 // is allocated for an oop pointer type before Escape Analysis. |
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304 // Note: C++ will not remove it since the call has side effect. |
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305 if (t_adr->isa_oopptr()) { |
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306 int alias_idx = phase->C->get_alias_index(t_adr->is_ptr()); |
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307 } |
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308 |
708
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309 Node* base = NULL; |
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310 if (address->is_AddP()) { |
708
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311 base = address->in(AddPNode::Base); |
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312 } |
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313 if (base != NULL && phase->type(base)->higher_equal(TypePtr::NULL_PTR) && |
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314 !t_adr->isa_rawptr()) { |
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315 // Note: raw address has TOP base and top->higher_equal(TypePtr::NULL_PTR) is true. |
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316 // Skip this node optimization if its address has TOP base. |
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317 return NodeSentinel; // caller will return NULL |
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318 } |
708
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319 |
0 | 320 // Avoid independent memory operations |
321 Node* old_mem = mem; | |
322 | |
36 | 323 // The code which unhooks non-raw memories from complete (macro-expanded) |
324 // initializations was removed. After macro-expansion all stores catched | |
325 // by Initialize node became raw stores and there is no information | |
326 // which memory slices they modify. So it is unsafe to move any memory | |
327 // operation above these stores. Also in most cases hooked non-raw memories | |
328 // were already unhooked by using information from detect_ptr_independence() | |
329 // and find_previous_store(). | |
0 | 330 |
331 if (mem->is_MergeMem()) { | |
332 MergeMemNode* mmem = mem->as_MergeMem(); | |
333 const TypePtr *tp = t_adr->is_ptr(); | |
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334 |
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335 mem = step_through_mergemem(phase, mmem, tp, adr_type(), tty); |
0 | 336 } |
337 | |
338 if (mem != old_mem) { | |
339 set_req(MemNode::Memory, mem); | |
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340 if (can_reshape && old_mem->outcnt() == 0) { |
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341 igvn->_worklist.push(old_mem); |
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342 } |
305 | 343 if (phase->type( mem ) == Type::TOP) return NodeSentinel; |
0 | 344 return this; |
345 } | |
346 | |
347 // let the subclass continue analyzing... | |
348 return NULL; | |
349 } | |
350 | |
351 // Helper function for proving some simple control dominations. | |
119
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352 // Attempt to prove that all control inputs of 'dom' dominate 'sub'. |
0 | 353 // Already assumes that 'dom' is available at 'sub', and that 'sub' |
354 // is not a constant (dominated by the method's StartNode). | |
355 // Used by MemNode::find_previous_store to prove that the | |
356 // control input of a memory operation predates (dominates) | |
357 // an allocation it wants to look past. | |
119
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358 bool MemNode::all_controls_dominate(Node* dom, Node* sub) { |
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359 if (dom == NULL || dom->is_top() || sub == NULL || sub->is_top()) |
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360 return false; // Conservative answer for dead code |
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361 |
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362 // Check 'dom'. Skip Proj and CatchProj nodes. |
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363 dom = dom->find_exact_control(dom); |
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364 if (dom == NULL || dom->is_top()) |
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365 return false; // Conservative answer for dead code |
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366 |
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367 if (dom == sub) { |
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368 // For the case when, for example, 'sub' is Initialize and the original |
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369 // 'dom' is Proj node of the 'sub'. |
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370 return false; |
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371 } |
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372 |
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373 if (dom->is_Con() || dom->is_Start() || dom->is_Root() || dom == sub) |
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374 return true; |
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375 |
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376 // 'dom' dominates 'sub' if its control edge and control edges |
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377 // of all its inputs dominate or equal to sub's control edge. |
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378 |
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379 // Currently 'sub' is either Allocate, Initialize or Start nodes. |
163 | 380 // Or Region for the check in LoadNode::Ideal(); |
381 // 'sub' should have sub->in(0) != NULL. | |
382 assert(sub->is_Allocate() || sub->is_Initialize() || sub->is_Start() || | |
10278 | 383 sub->is_Region() || sub->is_Call(), "expecting only these nodes"); |
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384 |
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385 // Get control edge of 'sub'. |
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386 Node* orig_sub = sub; |
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387 sub = sub->find_exact_control(sub->in(0)); |
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388 if (sub == NULL || sub->is_top()) |
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389 return false; // Conservative answer for dead code |
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390 |
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391 assert(sub->is_CFG(), "expecting control"); |
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392 |
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393 if (sub == dom) |
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394 return true; |
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395 |
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396 if (sub->is_Start() || sub->is_Root()) |
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397 return false; |
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398 |
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399 { |
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400 // Check all control edges of 'dom'. |
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401 |
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402 ResourceMark rm; |
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403 Arena* arena = Thread::current()->resource_area(); |
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404 Node_List nlist(arena); |
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405 Unique_Node_List dom_list(arena); |
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406 |
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407 dom_list.push(dom); |
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408 bool only_dominating_controls = false; |
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409 |
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410 for (uint next = 0; next < dom_list.size(); next++) { |
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411 Node* n = dom_list.at(next); |
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412 if (n == orig_sub) |
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413 return false; // One of dom's inputs dominated by sub. |
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414 if (!n->is_CFG() && n->pinned()) { |
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415 // Check only own control edge for pinned non-control nodes. |
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416 n = n->find_exact_control(n->in(0)); |
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417 if (n == NULL || n->is_top()) |
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418 return false; // Conservative answer for dead code |
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419 assert(n->is_CFG(), "expecting control"); |
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420 dom_list.push(n); |
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421 } else if (n->is_Con() || n->is_Start() || n->is_Root()) { |
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422 only_dominating_controls = true; |
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423 } else if (n->is_CFG()) { |
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424 if (n->dominates(sub, nlist)) |
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425 only_dominating_controls = true; |
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426 else |
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427 return false; |
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428 } else { |
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429 // First, own control edge. |
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430 Node* m = n->find_exact_control(n->in(0)); |
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431 if (m != NULL) { |
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432 if (m->is_top()) |
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433 return false; // Conservative answer for dead code |
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434 dom_list.push(m); |
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435 } |
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436 // Now, the rest of edges. |
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437 uint cnt = n->req(); |
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438 for (uint i = 1; i < cnt; i++) { |
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439 m = n->find_exact_control(n->in(i)); |
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440 if (m == NULL || m->is_top()) |
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441 continue; |
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442 dom_list.push(m); |
0 | 443 } |
444 } | |
445 } | |
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446 return only_dominating_controls; |
0 | 447 } |
448 } | |
449 | |
450 //---------------------detect_ptr_independence--------------------------------- | |
451 // Used by MemNode::find_previous_store to prove that two base | |
452 // pointers are never equal. | |
453 // The pointers are accompanied by their associated allocations, | |
454 // if any, which have been previously discovered by the caller. | |
455 bool MemNode::detect_ptr_independence(Node* p1, AllocateNode* a1, | |
456 Node* p2, AllocateNode* a2, | |
457 PhaseTransform* phase) { | |
458 // Attempt to prove that these two pointers cannot be aliased. | |
459 // They may both manifestly be allocations, and they should differ. | |
460 // Or, if they are not both allocations, they can be distinct constants. | |
461 // Otherwise, one is an allocation and the other a pre-existing value. | |
462 if (a1 == NULL && a2 == NULL) { // neither an allocation | |
463 return (p1 != p2) && p1->is_Con() && p2->is_Con(); | |
464 } else if (a1 != NULL && a2 != NULL) { // both allocations | |
465 return (a1 != a2); | |
466 } else if (a1 != NULL) { // one allocation a1 | |
467 // (Note: p2->is_Con implies p2->in(0)->is_Root, which dominates.) | |
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468 return all_controls_dominate(p2, a1); |
0 | 469 } else { //(a2 != NULL) // one allocation a2 |
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470 return all_controls_dominate(p1, a2); |
0 | 471 } |
472 return false; | |
473 } | |
474 | |
475 | |
476 // The logic for reordering loads and stores uses four steps: | |
477 // (a) Walk carefully past stores and initializations which we | |
478 // can prove are independent of this load. | |
479 // (b) Observe that the next memory state makes an exact match | |
480 // with self (load or store), and locate the relevant store. | |
481 // (c) Ensure that, if we were to wire self directly to the store, | |
482 // the optimizer would fold it up somehow. | |
483 // (d) Do the rewiring, and return, depending on some other part of | |
484 // the optimizer to fold up the load. | |
485 // This routine handles steps (a) and (b). Steps (c) and (d) are | |
486 // specific to loads and stores, so they are handled by the callers. | |
487 // (Currently, only LoadNode::Ideal has steps (c), (d). More later.) | |
488 // | |
489 Node* MemNode::find_previous_store(PhaseTransform* phase) { | |
490 Node* ctrl = in(MemNode::Control); | |
491 Node* adr = in(MemNode::Address); | |
492 intptr_t offset = 0; | |
493 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
494 AllocateNode* alloc = AllocateNode::Ideal_allocation(base, phase); | |
495 | |
496 if (offset == Type::OffsetBot) | |
497 return NULL; // cannot unalias unless there are precise offsets | |
498 | |
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499 const TypeOopPtr *addr_t = adr->bottom_type()->isa_oopptr(); |
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500 |
0 | 501 intptr_t size_in_bytes = memory_size(); |
502 | |
503 Node* mem = in(MemNode::Memory); // start searching here... | |
504 | |
505 int cnt = 50; // Cycle limiter | |
506 for (;;) { // While we can dance past unrelated stores... | |
507 if (--cnt < 0) break; // Caught in cycle or a complicated dance? | |
508 | |
509 if (mem->is_Store()) { | |
510 Node* st_adr = mem->in(MemNode::Address); | |
511 intptr_t st_offset = 0; | |
512 Node* st_base = AddPNode::Ideal_base_and_offset(st_adr, phase, st_offset); | |
513 if (st_base == NULL) | |
514 break; // inscrutable pointer | |
515 if (st_offset != offset && st_offset != Type::OffsetBot) { | |
516 const int MAX_STORE = BytesPerLong; | |
517 if (st_offset >= offset + size_in_bytes || | |
518 st_offset <= offset - MAX_STORE || | |
519 st_offset <= offset - mem->as_Store()->memory_size()) { | |
520 // Success: The offsets are provably independent. | |
521 // (You may ask, why not just test st_offset != offset and be done? | |
522 // The answer is that stores of different sizes can co-exist | |
523 // in the same sequence of RawMem effects. We sometimes initialize | |
524 // a whole 'tile' of array elements with a single jint or jlong.) | |
525 mem = mem->in(MemNode::Memory); | |
526 continue; // (a) advance through independent store memory | |
527 } | |
528 } | |
529 if (st_base != base && | |
530 detect_ptr_independence(base, alloc, | |
531 st_base, | |
532 AllocateNode::Ideal_allocation(st_base, phase), | |
533 phase)) { | |
534 // Success: The bases are provably independent. | |
535 mem = mem->in(MemNode::Memory); | |
536 continue; // (a) advance through independent store memory | |
537 } | |
538 | |
539 // (b) At this point, if the bases or offsets do not agree, we lose, | |
540 // since we have not managed to prove 'this' and 'mem' independent. | |
541 if (st_base == base && st_offset == offset) { | |
542 return mem; // let caller handle steps (c), (d) | |
543 } | |
544 | |
545 } else if (mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
546 InitializeNode* st_init = mem->in(0)->as_Initialize(); | |
547 AllocateNode* st_alloc = st_init->allocation(); | |
548 if (st_alloc == NULL) | |
549 break; // something degenerated | |
550 bool known_identical = false; | |
551 bool known_independent = false; | |
552 if (alloc == st_alloc) | |
553 known_identical = true; | |
554 else if (alloc != NULL) | |
555 known_independent = true; | |
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556 else if (all_controls_dominate(this, st_alloc)) |
0 | 557 known_independent = true; |
558 | |
559 if (known_independent) { | |
560 // The bases are provably independent: Either they are | |
561 // manifestly distinct allocations, or else the control | |
562 // of this load dominates the store's allocation. | |
563 int alias_idx = phase->C->get_alias_index(adr_type()); | |
564 if (alias_idx == Compile::AliasIdxRaw) { | |
565 mem = st_alloc->in(TypeFunc::Memory); | |
566 } else { | |
567 mem = st_init->memory(alias_idx); | |
568 } | |
569 continue; // (a) advance through independent store memory | |
570 } | |
571 | |
572 // (b) at this point, if we are not looking at a store initializing | |
573 // the same allocation we are loading from, we lose. | |
574 if (known_identical) { | |
575 // From caller, can_see_stored_value will consult find_captured_store. | |
576 return mem; // let caller handle steps (c), (d) | |
577 } | |
578 | |
223 | 579 } else if (addr_t != NULL && addr_t->is_known_instance_field()) { |
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580 // Can't use optimize_simple_memory_chain() since it needs PhaseGVN. |
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581 if (mem->is_Proj() && mem->in(0)->is_Call()) { |
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582 CallNode *call = mem->in(0)->as_Call(); |
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583 if (!call->may_modify(addr_t, phase)) { |
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584 mem = call->in(TypeFunc::Memory); |
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585 continue; // (a) advance through independent call memory |
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586 } |
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587 } else if (mem->is_Proj() && mem->in(0)->is_MemBar()) { |
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588 mem = mem->in(0)->in(TypeFunc::Memory); |
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589 continue; // (a) advance through independent MemBar memory |
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590 } else if (mem->is_ClearArray()) { |
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591 if (ClearArrayNode::step_through(&mem, (uint)addr_t->instance_id(), phase)) { |
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592 // (the call updated 'mem' value) |
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593 continue; // (a) advance through independent allocation memory |
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594 } else { |
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595 // Can not bypass initialization of the instance |
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596 // we are looking for. |
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597 return mem; |
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598 } |
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599 } else if (mem->is_MergeMem()) { |
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600 int alias_idx = phase->C->get_alias_index(adr_type()); |
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601 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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602 continue; // (a) advance through independent MergeMem memory |
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603 } |
0 | 604 } |
605 | |
606 // Unless there is an explicit 'continue', we must bail out here, | |
607 // because 'mem' is an inscrutable memory state (e.g., a call). | |
608 break; | |
609 } | |
610 | |
611 return NULL; // bail out | |
612 } | |
613 | |
614 //----------------------calculate_adr_type------------------------------------- | |
615 // Helper function. Notices when the given type of address hits top or bottom. | |
616 // Also, asserts a cross-check of the type against the expected address type. | |
617 const TypePtr* MemNode::calculate_adr_type(const Type* t, const TypePtr* cross_check) { | |
618 if (t == Type::TOP) return NULL; // does not touch memory any more? | |
619 #ifdef PRODUCT | |
620 cross_check = NULL; | |
621 #else | |
622 if (!VerifyAliases || is_error_reported() || Node::in_dump()) cross_check = NULL; | |
623 #endif | |
624 const TypePtr* tp = t->isa_ptr(); | |
625 if (tp == NULL) { | |
626 assert(cross_check == NULL || cross_check == TypePtr::BOTTOM, "expected memory type must be wide"); | |
627 return TypePtr::BOTTOM; // touches lots of memory | |
628 } else { | |
629 #ifdef ASSERT | |
630 // %%%% [phh] We don't check the alias index if cross_check is | |
631 // TypeRawPtr::BOTTOM. Needs to be investigated. | |
632 if (cross_check != NULL && | |
633 cross_check != TypePtr::BOTTOM && | |
634 cross_check != TypeRawPtr::BOTTOM) { | |
635 // Recheck the alias index, to see if it has changed (due to a bug). | |
636 Compile* C = Compile::current(); | |
637 assert(C->get_alias_index(cross_check) == C->get_alias_index(tp), | |
638 "must stay in the original alias category"); | |
639 // The type of the address must be contained in the adr_type, | |
640 // disregarding "null"-ness. | |
641 // (We make an exception for TypeRawPtr::BOTTOM, which is a bit bucket.) | |
642 const TypePtr* tp_notnull = tp->join(TypePtr::NOTNULL)->is_ptr(); | |
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643 assert(cross_check->meet(tp_notnull) == cross_check->remove_speculative(), |
0 | 644 "real address must not escape from expected memory type"); |
645 } | |
646 #endif | |
647 return tp; | |
648 } | |
649 } | |
650 | |
651 //------------------------adr_phi_is_loop_invariant---------------------------- | |
652 // A helper function for Ideal_DU_postCCP to check if a Phi in a counted | |
653 // loop is loop invariant. Make a quick traversal of Phi and associated | |
654 // CastPP nodes, looking to see if they are a closed group within the loop. | |
655 bool MemNode::adr_phi_is_loop_invariant(Node* adr_phi, Node* cast) { | |
656 // The idea is that the phi-nest must boil down to only CastPP nodes | |
657 // with the same data. This implies that any path into the loop already | |
658 // includes such a CastPP, and so the original cast, whatever its input, | |
659 // must be covered by an equivalent cast, with an earlier control input. | |
660 ResourceMark rm; | |
661 | |
662 // The loop entry input of the phi should be the unique dominating | |
663 // node for every Phi/CastPP in the loop. | |
664 Unique_Node_List closure; | |
665 closure.push(adr_phi->in(LoopNode::EntryControl)); | |
666 | |
667 // Add the phi node and the cast to the worklist. | |
668 Unique_Node_List worklist; | |
669 worklist.push(adr_phi); | |
670 if( cast != NULL ){ | |
671 if( !cast->is_ConstraintCast() ) return false; | |
672 worklist.push(cast); | |
673 } | |
674 | |
675 // Begin recursive walk of phi nodes. | |
676 while( worklist.size() ){ | |
677 // Take a node off the worklist | |
678 Node *n = worklist.pop(); | |
679 if( !closure.member(n) ){ | |
680 // Add it to the closure. | |
681 closure.push(n); | |
682 // Make a sanity check to ensure we don't waste too much time here. | |
683 if( closure.size() > 20) return false; | |
684 // This node is OK if: | |
685 // - it is a cast of an identical value | |
686 // - or it is a phi node (then we add its inputs to the worklist) | |
687 // Otherwise, the node is not OK, and we presume the cast is not invariant | |
688 if( n->is_ConstraintCast() ){ | |
689 worklist.push(n->in(1)); | |
690 } else if( n->is_Phi() ) { | |
691 for( uint i = 1; i < n->req(); i++ ) { | |
692 worklist.push(n->in(i)); | |
693 } | |
694 } else { | |
695 return false; | |
696 } | |
697 } | |
698 } | |
699 | |
700 // Quit when the worklist is empty, and we've found no offending nodes. | |
701 return true; | |
702 } | |
703 | |
704 //------------------------------Ideal_DU_postCCP------------------------------- | |
705 // Find any cast-away of null-ness and keep its control. Null cast-aways are | |
706 // going away in this pass and we need to make this memory op depend on the | |
707 // gating null check. | |
163 | 708 Node *MemNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
709 return Ideal_common_DU_postCCP(ccp, this, in(MemNode::Address)); | |
710 } | |
0 | 711 |
712 // I tried to leave the CastPP's in. This makes the graph more accurate in | |
713 // some sense; we get to keep around the knowledge that an oop is not-null | |
714 // after some test. Alas, the CastPP's interfere with GVN (some values are | |
715 // the regular oop, some are the CastPP of the oop, all merge at Phi's which | |
716 // cannot collapse, etc). This cost us 10% on SpecJVM, even when I removed | |
717 // some of the more trivial cases in the optimizer. Removing more useless | |
718 // Phi's started allowing Loads to illegally float above null checks. I gave | |
719 // up on this approach. CNC 10/20/2000 | |
163 | 720 // This static method may be called not from MemNode (EncodePNode calls it). |
721 // Only the control edge of the node 'n' might be updated. | |
722 Node *MemNode::Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr ) { | |
0 | 723 Node *skipped_cast = NULL; |
724 // Need a null check? Regular static accesses do not because they are | |
725 // from constant addresses. Array ops are gated by the range check (which | |
726 // always includes a NULL check). Just check field ops. | |
163 | 727 if( n->in(MemNode::Control) == NULL ) { |
0 | 728 // Scan upwards for the highest location we can place this memory op. |
729 while( true ) { | |
730 switch( adr->Opcode() ) { | |
731 | |
732 case Op_AddP: // No change to NULL-ness, so peek thru AddP's | |
733 adr = adr->in(AddPNode::Base); | |
734 continue; | |
735 | |
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736 case Op_DecodeN: // No change to NULL-ness, so peek thru |
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737 case Op_DecodeNKlass: |
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738 adr = adr->in(1); |
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739 continue; |
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740 |
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741 case Op_EncodeP: |
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742 case Op_EncodePKlass: |
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743 // EncodeP node's control edge could be set by this method |
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744 // when EncodeP node depends on CastPP node. |
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745 // |
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746 // Use its control edge for memory op because EncodeP may go away |
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747 // later when it is folded with following or preceding DecodeN node. |
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748 if (adr->in(0) == NULL) { |
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749 // Keep looking for cast nodes. |
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750 adr = adr->in(1); |
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751 continue; |
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752 } |
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753 ccp->hash_delete(n); |
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754 n->set_req(MemNode::Control, adr->in(0)); |
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755 ccp->hash_insert(n); |
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756 return n; |
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757 |
0 | 758 case Op_CastPP: |
759 // If the CastPP is useless, just peek on through it. | |
760 if( ccp->type(adr) == ccp->type(adr->in(1)) ) { | |
761 // Remember the cast that we've peeked though. If we peek | |
762 // through more than one, then we end up remembering the highest | |
763 // one, that is, if in a loop, the one closest to the top. | |
764 skipped_cast = adr; | |
765 adr = adr->in(1); | |
766 continue; | |
767 } | |
768 // CastPP is going away in this pass! We need this memory op to be | |
769 // control-dependent on the test that is guarding the CastPP. | |
163 | 770 ccp->hash_delete(n); |
771 n->set_req(MemNode::Control, adr->in(0)); | |
772 ccp->hash_insert(n); | |
773 return n; | |
0 | 774 |
775 case Op_Phi: | |
776 // Attempt to float above a Phi to some dominating point. | |
777 if (adr->in(0) != NULL && adr->in(0)->is_CountedLoop()) { | |
778 // If we've already peeked through a Cast (which could have set the | |
779 // control), we can't float above a Phi, because the skipped Cast | |
780 // may not be loop invariant. | |
781 if (adr_phi_is_loop_invariant(adr, skipped_cast)) { | |
782 adr = adr->in(1); | |
783 continue; | |
784 } | |
785 } | |
786 | |
787 // Intentional fallthrough! | |
788 | |
789 // No obvious dominating point. The mem op is pinned below the Phi | |
790 // by the Phi itself. If the Phi goes away (no true value is merged) | |
791 // then the mem op can float, but not indefinitely. It must be pinned | |
792 // behind the controls leading to the Phi. | |
793 case Op_CheckCastPP: | |
794 // These usually stick around to change address type, however a | |
795 // useless one can be elided and we still need to pick up a control edge | |
796 if (adr->in(0) == NULL) { | |
797 // This CheckCastPP node has NO control and is likely useless. But we | |
798 // need check further up the ancestor chain for a control input to keep | |
799 // the node in place. 4959717. | |
800 skipped_cast = adr; | |
801 adr = adr->in(1); | |
802 continue; | |
803 } | |
163 | 804 ccp->hash_delete(n); |
805 n->set_req(MemNode::Control, adr->in(0)); | |
806 ccp->hash_insert(n); | |
807 return n; | |
0 | 808 |
809 // List of "safe" opcodes; those that implicitly block the memory | |
810 // op below any null check. | |
811 case Op_CastX2P: // no null checks on native pointers | |
812 case Op_Parm: // 'this' pointer is not null | |
813 case Op_LoadP: // Loading from within a klass | |
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814 case Op_LoadN: // Loading from within a klass |
0 | 815 case Op_LoadKlass: // Loading from within a klass |
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816 case Op_LoadNKlass: // Loading from within a klass |
0 | 817 case Op_ConP: // Loading from a klass |
163 | 818 case Op_ConN: // Loading from a klass |
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819 case Op_ConNKlass: // Loading from a klass |
0 | 820 case Op_CreateEx: // Sucking up the guts of an exception oop |
821 case Op_Con: // Reading from TLS | |
822 case Op_CMoveP: // CMoveP is pinned | |
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823 case Op_CMoveN: // CMoveN is pinned |
0 | 824 break; // No progress |
825 | |
826 case Op_Proj: // Direct call to an allocation routine | |
827 case Op_SCMemProj: // Memory state from store conditional ops | |
828 #ifdef ASSERT | |
829 { | |
830 assert(adr->as_Proj()->_con == TypeFunc::Parms, "must be return value"); | |
831 const Node* call = adr->in(0); | |
163 | 832 if (call->is_CallJava()) { |
833 const CallJavaNode* call_java = call->as_CallJava(); | |
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834 const TypeTuple *r = call_java->tf()->range(); |
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835 assert(r->cnt() > TypeFunc::Parms, "must return value"); |
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836 const Type* ret_type = r->field_at(TypeFunc::Parms); |
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837 assert(ret_type && ret_type->isa_ptr(), "must return pointer"); |
0 | 838 // We further presume that this is one of |
839 // new_instance_Java, new_array_Java, or | |
840 // the like, but do not assert for this. | |
841 } else if (call->is_Allocate()) { | |
842 // similar case to new_instance_Java, etc. | |
843 } else if (!call->is_CallLeaf()) { | |
844 // Projections from fetch_oop (OSR) are allowed as well. | |
845 ShouldNotReachHere(); | |
846 } | |
847 } | |
848 #endif | |
849 break; | |
850 default: | |
851 ShouldNotReachHere(); | |
852 } | |
853 break; | |
854 } | |
855 } | |
856 | |
857 return NULL; // No progress | |
858 } | |
859 | |
860 | |
861 //============================================================================= | |
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862 // Should LoadNode::Ideal() attempt to remove control edges? |
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863 bool LoadNode::can_remove_control() const { |
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864 return true; |
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865 } |
0 | 866 uint LoadNode::size_of() const { return sizeof(*this); } |
867 uint LoadNode::cmp( const Node &n ) const | |
868 { return !Type::cmp( _type, ((LoadNode&)n)._type ); } | |
869 const Type *LoadNode::bottom_type() const { return _type; } | |
870 uint LoadNode::ideal_reg() const { | |
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871 return _type->ideal_reg(); |
0 | 872 } |
873 | |
874 #ifndef PRODUCT | |
875 void LoadNode::dump_spec(outputStream *st) const { | |
876 MemNode::dump_spec(st); | |
877 if( !Verbose && !WizardMode ) { | |
878 // standard dump does this in Verbose and WizardMode | |
879 st->print(" #"); _type->dump_on(st); | |
880 } | |
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881 if (!_depends_only_on_test) { |
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882 st->print(" (does not depend only on test)"); |
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883 } |
0 | 884 } |
885 #endif | |
886 | |
1609 | 887 #ifdef ASSERT |
888 //----------------------------is_immutable_value------------------------------- | |
889 // Helper function to allow a raw load without control edge for some cases | |
890 bool LoadNode::is_immutable_value(Node* adr) { | |
891 return (adr->is_AddP() && adr->in(AddPNode::Base)->is_top() && | |
892 adr->in(AddPNode::Address)->Opcode() == Op_ThreadLocal && | |
893 (adr->in(AddPNode::Offset)->find_intptr_t_con(-1) == | |
894 in_bytes(JavaThread::osthread_offset()))); | |
895 } | |
896 #endif | |
0 | 897 |
898 //----------------------------LoadNode::make----------------------------------- | |
899 // Polymorphic factory method: | |
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900 Node *LoadNode::make(PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const TypePtr* adr_type, const Type *rt, BasicType bt, MemOrd mo, ControlDependency control_dependency) { |
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901 Compile* C = gvn.C; |
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902 |
0 | 903 // sanity check the alias category against the created node type |
904 assert(!(adr_type->isa_oopptr() && | |
905 adr_type->offset() == oopDesc::klass_offset_in_bytes()), | |
906 "use LoadKlassNode instead"); | |
907 assert(!(adr_type->isa_aryptr() && | |
908 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()), | |
909 "use LoadRangeNode instead"); | |
1609 | 910 // Check control edge of raw loads |
911 assert( ctl != NULL || C->get_alias_index(adr_type) != Compile::AliasIdxRaw || | |
912 // oop will be recorded in oop map if load crosses safepoint | |
913 rt->isa_oopptr() || is_immutable_value(adr), | |
914 "raw memory operations should have control edge"); | |
0 | 915 switch (bt) { |
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916 case T_BOOLEAN: return new (C) LoadUBNode(ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); |
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917 case T_BYTE: return new (C) LoadBNode (ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); |
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918 case T_INT: return new (C) LoadINode (ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); |
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919 case T_CHAR: return new (C) LoadUSNode(ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); |
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920 case T_SHORT: return new (C) LoadSNode (ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); |
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921 case T_LONG: return new (C) LoadLNode (ctl, mem, adr, adr_type, rt->is_long(), mo, control_dependency); |
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922 case T_FLOAT: return new (C) LoadFNode (ctl, mem, adr, adr_type, rt, mo, control_dependency); |
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923 case T_DOUBLE: return new (C) LoadDNode (ctl, mem, adr, adr_type, rt, mo, control_dependency); |
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924 case T_ADDRESS: return new (C) LoadPNode (ctl, mem, adr, adr_type, rt->is_ptr(), mo, control_dependency); |
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925 case T_OBJECT: |
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926 #ifdef _LP64 |
163 | 927 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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928 Node* load = gvn.transform(new (C) LoadNNode(ctl, mem, adr, adr_type, rt->make_narrowoop(), mo, control_dependency)); |
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929 return new (C) DecodeNNode(load, load->bottom_type()->make_ptr()); |
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930 } else |
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931 #endif |
163 | 932 { |
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933 assert(!adr->bottom_type()->is_ptr_to_narrowoop() && !adr->bottom_type()->is_ptr_to_narrowklass(), "should have got back a narrow oop"); |
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934 return new (C) LoadPNode(ctl, mem, adr, adr_type, rt->is_oopptr(), mo, control_dependency); |
163 | 935 } |
0 | 936 } |
937 ShouldNotReachHere(); | |
938 return (LoadNode*)NULL; | |
939 } | |
940 | |
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941 LoadLNode* LoadLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt, MemOrd mo, ControlDependency control_dependency) { |
0 | 942 bool require_atomic = true; |
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943 return new (C) LoadLNode(ctl, mem, adr, adr_type, rt->is_long(), mo, control_dependency, require_atomic); |
0 | 944 } |
945 | |
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946 LoadDNode* LoadDNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt, MemOrd mo, ControlDependency control_dependency) { |
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947 bool require_atomic = true; |
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948 return new (C) LoadDNode(ctl, mem, adr, adr_type, rt, mo, control_dependency, require_atomic); |
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949 } |
0 | 950 |
951 | |
952 | |
953 //------------------------------hash------------------------------------------- | |
954 uint LoadNode::hash() const { | |
955 // unroll addition of interesting fields | |
956 return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address); | |
957 } | |
958 | |
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959 static bool skip_through_membars(Compile::AliasType* atp, const TypeInstPtr* tp, bool eliminate_boxing) { |
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960 if ((atp != NULL) && (atp->index() >= Compile::AliasIdxRaw)) { |
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961 bool non_volatile = (atp->field() != NULL) && !atp->field()->is_volatile(); |
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962 bool is_stable_ary = FoldStableValues && |
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963 (tp != NULL) && (tp->isa_aryptr() != NULL) && |
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964 tp->isa_aryptr()->is_stable(); |
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965 |
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966 return (eliminate_boxing && non_volatile) || is_stable_ary; |
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967 } |
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968 |
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969 return false; |
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970 } |
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971 |
0 | 972 //---------------------------can_see_stored_value------------------------------ |
973 // This routine exists to make sure this set of tests is done the same | |
974 // everywhere. We need to make a coordinated change: first LoadNode::Ideal | |
975 // will change the graph shape in a way which makes memory alive twice at the | |
976 // same time (uses the Oracle model of aliasing), then some | |
977 // LoadXNode::Identity will fold things back to the equivalence-class model | |
978 // of aliasing. | |
979 Node* MemNode::can_see_stored_value(Node* st, PhaseTransform* phase) const { | |
980 Node* ld_adr = in(MemNode::Address); | |
10278 | 981 intptr_t ld_off = 0; |
982 AllocateNode* ld_alloc = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off); | |
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983 const TypeInstPtr* tp = phase->type(ld_adr)->isa_instptr(); |
10278 | 984 Compile::AliasType* atp = (tp != NULL) ? phase->C->alias_type(tp) : NULL; |
985 // This is more general than load from boxing objects. | |
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986 if (skip_through_membars(atp, tp, phase->C->eliminate_boxing())) { |
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987 uint alias_idx = atp->index(); |
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988 bool final = !atp->is_rewritable(); |
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989 Node* result = NULL; |
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990 Node* current = st; |
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991 // Skip through chains of MemBarNodes checking the MergeMems for |
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992 // new states for the slice of this load. Stop once any other |
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993 // kind of node is encountered. Loads from final memory can skip |
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994 // through any kind of MemBar but normal loads shouldn't skip |
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995 // through MemBarAcquire since the could allow them to move out of |
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996 // a synchronized region. |
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997 while (current->is_Proj()) { |
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998 int opc = current->in(0)->Opcode(); |
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999 if ((final && (opc == Op_MemBarAcquire || |
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1000 opc == Op_MemBarAcquireLock || |
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1001 opc == Op_LoadFence)) || |
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1002 opc == Op_MemBarRelease || |
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1003 opc == Op_StoreFence || |
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1004 opc == Op_MemBarReleaseLock || |
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1005 opc == Op_MemBarCPUOrder) { |
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1006 Node* mem = current->in(0)->in(TypeFunc::Memory); |
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1007 if (mem->is_MergeMem()) { |
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1008 MergeMemNode* merge = mem->as_MergeMem(); |
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1009 Node* new_st = merge->memory_at(alias_idx); |
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1010 if (new_st == merge->base_memory()) { |
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1011 // Keep searching |
10278 | 1012 current = new_st; |
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1013 continue; |
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1014 } |
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1015 // Save the new memory state for the slice and fall through |
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1016 // to exit. |
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1017 result = new_st; |
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1018 } |
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1019 } |
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1020 break; |
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1021 } |
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1022 if (result != NULL) { |
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1023 st = result; |
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1024 } |
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1025 } |
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1026 |
0 | 1027 // Loop around twice in the case Load -> Initialize -> Store. |
1028 // (See PhaseIterGVN::add_users_to_worklist, which knows about this case.) | |
1029 for (int trip = 0; trip <= 1; trip++) { | |
1030 | |
1031 if (st->is_Store()) { | |
1032 Node* st_adr = st->in(MemNode::Address); | |
1033 if (!phase->eqv(st_adr, ld_adr)) { | |
1034 // Try harder before giving up... Match raw and non-raw pointers. | |
1035 intptr_t st_off = 0; | |
1036 AllocateNode* alloc = AllocateNode::Ideal_allocation(st_adr, phase, st_off); | |
1037 if (alloc == NULL) return NULL; | |
10278 | 1038 if (alloc != ld_alloc) return NULL; |
0 | 1039 if (ld_off != st_off) return NULL; |
1040 // At this point we have proven something like this setup: | |
1041 // A = Allocate(...) | |
1042 // L = LoadQ(, AddP(CastPP(, A.Parm),, #Off)) | |
1043 // S = StoreQ(, AddP(, A.Parm , #Off), V) | |
1044 // (Actually, we haven't yet proven the Q's are the same.) | |
1045 // In other words, we are loading from a casted version of | |
1046 // the same pointer-and-offset that we stored to. | |
1047 // Thus, we are able to replace L by V. | |
1048 } | |
1049 // Now prove that we have a LoadQ matched to a StoreQ, for some Q. | |
1050 if (store_Opcode() != st->Opcode()) | |
1051 return NULL; | |
1052 return st->in(MemNode::ValueIn); | |
1053 } | |
1054 | |
1055 // A load from a freshly-created object always returns zero. | |
1056 // (This can happen after LoadNode::Ideal resets the load's memory input | |
1057 // to find_captured_store, which returned InitializeNode::zero_memory.) | |
1058 if (st->is_Proj() && st->in(0)->is_Allocate() && | |
10278 | 1059 (st->in(0) == ld_alloc) && |
1060 (ld_off >= st->in(0)->as_Allocate()->minimum_header_size())) { | |
0 | 1061 // return a zero value for the load's basic type |
1062 // (This is one of the few places where a generic PhaseTransform | |
1063 // can create new nodes. Think of it as lazily manifesting | |
1064 // virtually pre-existing constants.) | |
1065 return phase->zerocon(memory_type()); | |
1066 } | |
1067 | |
1068 // A load from an initialization barrier can match a captured store. | |
1069 if (st->is_Proj() && st->in(0)->is_Initialize()) { | |
1070 InitializeNode* init = st->in(0)->as_Initialize(); | |
1071 AllocateNode* alloc = init->allocation(); | |
10278 | 1072 if ((alloc != NULL) && (alloc == ld_alloc)) { |
0 | 1073 // examine a captured store value |
10278 | 1074 st = init->find_captured_store(ld_off, memory_size(), phase); |
0 | 1075 if (st != NULL) |
1076 continue; // take one more trip around | |
1077 } | |
1078 } | |
1079 | |
10278 | 1080 // Load boxed value from result of valueOf() call is input parameter. |
1081 if (this->is_Load() && ld_adr->is_AddP() && | |
1082 (tp != NULL) && tp->is_ptr_to_boxed_value()) { | |
1083 intptr_t ignore = 0; | |
1084 Node* base = AddPNode::Ideal_base_and_offset(ld_adr, phase, ignore); | |
1085 if (base != NULL && base->is_Proj() && | |
1086 base->as_Proj()->_con == TypeFunc::Parms && | |
1087 base->in(0)->is_CallStaticJava() && | |
1088 base->in(0)->as_CallStaticJava()->is_boxing_method()) { | |
1089 return base->in(0)->in(TypeFunc::Parms); | |
1090 } | |
1091 } | |
1092 | |
0 | 1093 break; |
1094 } | |
1095 | |
1096 return NULL; | |
1097 } | |
1098 | |
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1099 //----------------------is_instance_field_load_with_local_phi------------------ |
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1100 bool LoadNode::is_instance_field_load_with_local_phi(Node* ctrl) { |
10278 | 1101 if( in(Memory)->is_Phi() && in(Memory)->in(0) == ctrl && |
1102 in(Address)->is_AddP() ) { | |
1103 const TypeOopPtr* t_oop = in(Address)->bottom_type()->isa_oopptr(); | |
1104 // Only instances and boxed values. | |
1105 if( t_oop != NULL && | |
1106 (t_oop->is_ptr_to_boxed_value() || | |
1107 t_oop->is_known_instance_field()) && | |
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1108 t_oop->offset() != Type::OffsetBot && |
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1109 t_oop->offset() != Type::OffsetTop) { |
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1110 return true; |
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1111 } |
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1112 } |
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1113 return false; |
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1114 } |
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1115 |
0 | 1116 //------------------------------Identity--------------------------------------- |
1117 // Loads are identity if previous store is to same address | |
1118 Node *LoadNode::Identity( PhaseTransform *phase ) { | |
1119 // If the previous store-maker is the right kind of Store, and the store is | |
1120 // to the same address, then we are equal to the value stored. | |
10278 | 1121 Node* mem = in(Memory); |
0 | 1122 Node* value = can_see_stored_value(mem, phase); |
1123 if( value ) { | |
1124 // byte, short & char stores truncate naturally. | |
1125 // A load has to load the truncated value which requires | |
1126 // some sort of masking operation and that requires an | |
1127 // Ideal call instead of an Identity call. | |
1128 if (memory_size() < BytesPerInt) { | |
1129 // If the input to the store does not fit with the load's result type, | |
1130 // it must be truncated via an Ideal call. | |
1131 if (!phase->type(value)->higher_equal(phase->type(this))) | |
1132 return this; | |
1133 } | |
1134 // (This works even when value is a Con, but LoadNode::Value | |
1135 // usually runs first, producing the singleton type of the Con.) | |
1136 return value; | |
1137 } | |
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1138 |
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1139 // Search for an existing data phi which was generated before for the same |
605 | 1140 // instance's field to avoid infinite generation of phis in a loop. |
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1141 Node *region = mem->in(0); |
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1142 if (is_instance_field_load_with_local_phi(region)) { |
10278 | 1143 const TypeOopPtr *addr_t = in(Address)->bottom_type()->isa_oopptr(); |
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1144 int this_index = phase->C->get_alias_index(addr_t); |
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|
1145 int this_offset = addr_t->offset(); |
10278 | 1146 int this_iid = addr_t->instance_id(); |
1147 if (!addr_t->is_known_instance() && | |
1148 addr_t->is_ptr_to_boxed_value()) { | |
1149 // Use _idx of address base (could be Phi node) for boxed values. | |
1150 intptr_t ignore = 0; | |
1151 Node* base = AddPNode::Ideal_base_and_offset(in(Address), phase, ignore); | |
1152 this_iid = base->_idx; | |
1153 } | |
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1154 const Type* this_type = bottom_type(); |
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1155 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
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1156 Node* phi = region->fast_out(i); |
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1157 if (phi->is_Phi() && phi != mem && |
10278 | 1158 phi->as_Phi()->is_same_inst_field(this_type, this_iid, this_index, this_offset)) { |
64
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|
1159 return phi; |
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|
1160 } |
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|
1161 } |
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|
1162 } |
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|
1163 |
0 | 1164 return this; |
1165 } | |
1166 | |
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|
1167 // We're loading from an object which has autobox behaviour. |
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|
1168 // If this object is result of a valueOf call we'll have a phi |
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|
1169 // merging a newly allocated object and a load from the cache. |
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|
1170 // We want to replace this load with the original incoming |
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1171 // argument to the valueOf call. |
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|
1172 Node* LoadNode::eliminate_autobox(PhaseGVN* phase) { |
10278 | 1173 assert(phase->C->eliminate_boxing(), "sanity"); |
1174 intptr_t ignore = 0; | |
1175 Node* base = AddPNode::Ideal_base_and_offset(in(Address), phase, ignore); | |
1176 if ((base == NULL) || base->is_Phi()) { | |
1177 // Push the loads from the phi that comes from valueOf up | |
1178 // through it to allow elimination of the loads and the recovery | |
1179 // of the original value. It is done in split_through_phi(). | |
1180 return NULL; | |
583
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|
1181 } else if (base->is_Load() || |
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|
1182 base->is_DecodeN() && base->in(1)->is_Load()) { |
10278 | 1183 // Eliminate the load of boxed value for integer types from the cache |
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|
1184 // array by deriving the value from the index into the array. |
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changeset
|
1185 // Capture the offset of the load and then reverse the computation. |
10278 | 1186 |
1187 // Get LoadN node which loads a boxing object from 'cache' array. | |
1188 if (base->is_DecodeN()) { | |
1189 base = base->in(1); | |
1190 } | |
1191 if (!base->in(Address)->is_AddP()) { | |
1192 return NULL; // Complex address | |
583
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|
1193 } |
10278 | 1194 AddPNode* address = base->in(Address)->as_AddP(); |
1195 Node* cache_base = address->in(AddPNode::Base); | |
1196 if ((cache_base != NULL) && cache_base->is_DecodeN()) { | |
1197 // Get ConP node which is static 'cache' field. | |
1198 cache_base = cache_base->in(1); | |
1199 } | |
1200 if ((cache_base != NULL) && cache_base->is_Con()) { | |
1201 const TypeAryPtr* base_type = cache_base->bottom_type()->isa_aryptr(); | |
1202 if ((base_type != NULL) && base_type->is_autobox_cache()) { | |
17
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|
1203 Node* elements[4]; |
10278 | 1204 int shift = exact_log2(type2aelembytes(T_OBJECT)); |
1205 int count = address->unpack_offsets(elements, ARRAY_SIZE(elements)); | |
1206 if ((count > 0) && elements[0]->is_Con() && | |
1207 ((count == 1) || | |
1208 (count == 2) && elements[1]->Opcode() == Op_LShiftX && | |
1209 elements[1]->in(2) == phase->intcon(shift))) { | |
1210 ciObjArray* array = base_type->const_oop()->as_obj_array(); | |
1211 // Fetch the box object cache[0] at the base of the array and get its value | |
1212 ciInstance* box = array->obj_at(0)->as_instance(); | |
1213 ciInstanceKlass* ik = box->klass()->as_instance_klass(); | |
1214 assert(ik->is_box_klass(), "sanity"); | |
1215 assert(ik->nof_nonstatic_fields() == 1, "change following code"); | |
1216 if (ik->nof_nonstatic_fields() == 1) { | |
1217 // This should be true nonstatic_field_at requires calling | |
1218 // nof_nonstatic_fields so check it anyway | |
1219 ciConstant c = box->field_value(ik->nonstatic_field_at(0)); | |
1220 BasicType bt = c.basic_type(); | |
1221 // Only integer types have boxing cache. | |
1222 assert(bt == T_BOOLEAN || bt == T_CHAR || | |
1223 bt == T_BYTE || bt == T_SHORT || | |
1224 bt == T_INT || bt == T_LONG, err_msg_res("wrong type = %s", type2name(bt))); | |
1225 jlong cache_low = (bt == T_LONG) ? c.as_long() : c.as_int(); | |
1226 if (cache_low != (int)cache_low) { | |
1227 return NULL; // should not happen since cache is array indexed by value | |
1228 } | |
1229 jlong offset = arrayOopDesc::base_offset_in_bytes(T_OBJECT) - (cache_low << shift); | |
1230 if (offset != (int)offset) { | |
1231 return NULL; // should not happen since cache is array indexed by value | |
1232 } | |
1233 // Add up all the offsets making of the address of the load | |
1234 Node* result = elements[0]; | |
1235 for (int i = 1; i < count; i++) { | |
1236 result = phase->transform(new (phase->C) AddXNode(result, elements[i])); | |
1237 } | |
1238 // Remove the constant offset from the address and then | |
1239 result = phase->transform(new (phase->C) AddXNode(result, phase->MakeConX(-(int)offset))); | |
1240 // remove the scaling of the offset to recover the original index. | |
1241 if (result->Opcode() == Op_LShiftX && result->in(2) == phase->intcon(shift)) { | |
1242 // Peel the shift off directly but wrap it in a dummy node | |
1243 // since Ideal can't return existing nodes | |
1244 result = new (phase->C) RShiftXNode(result->in(1), phase->intcon(0)); | |
1245 } else if (result->is_Add() && result->in(2)->is_Con() && | |
1246 result->in(1)->Opcode() == Op_LShiftX && | |
1247 result->in(1)->in(2) == phase->intcon(shift)) { | |
1248 // We can't do general optimization: ((X<<Z) + Y) >> Z ==> X + (Y>>Z) | |
1249 // but for boxing cache access we know that X<<Z will not overflow | |
1250 // (there is range check) so we do this optimizatrion by hand here. | |
1251 Node* add_con = new (phase->C) RShiftXNode(result->in(2), phase->intcon(shift)); | |
1252 result = new (phase->C) AddXNode(result->in(1)->in(1), phase->transform(add_con)); | |
1253 } else { | |
1254 result = new (phase->C) RShiftXNode(result, phase->intcon(shift)); | |
1255 } | |
1256 #ifdef _LP64 | |
1257 if (bt != T_LONG) { | |
1258 result = new (phase->C) ConvL2INode(phase->transform(result)); | |
1259 } | |
1260 #else | |
1261 if (bt == T_LONG) { | |
1262 result = new (phase->C) ConvI2LNode(phase->transform(result)); | |
1263 } | |
1264 #endif | |
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1265 // Boxing/unboxing can be done from signed & unsigned loads (e.g. LoadUB -> ... -> LoadB pair). |
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1266 // Need to preserve unboxing load type if it is unsigned. |
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1267 switch(this->Opcode()) { |
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8058847: C2: EliminateAutoBox regression after 8042786
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1268 case Op_LoadUB: |
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1269 result = new (phase->C) AndINode(phase->transform(result), phase->intcon(0xFF)); |
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|
1270 break; |
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|
1271 case Op_LoadUS: |
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1272 result = new (phase->C) AndINode(phase->transform(result), phase->intcon(0xFFFF)); |
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8058847: C2: EliminateAutoBox regression after 8042786
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|
1273 break; |
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|
1274 } |
10278 | 1275 return result; |
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|
1276 } |
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|
1277 } |
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1278 } |
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|
1279 } |
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|
1280 } |
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|
1281 return NULL; |
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|
1282 } |
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|
1283 |
10278 | 1284 static bool stable_phi(PhiNode* phi, PhaseGVN *phase) { |
1285 Node* region = phi->in(0); | |
163 | 1286 if (region == NULL) { |
10278 | 1287 return false; // Wait stable graph |
163 | 1288 } |
10278 | 1289 uint cnt = phi->req(); |
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1290 for (uint i = 1; i < cnt; i++) { |
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1291 Node* rc = region->in(i); |
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1292 if (rc == NULL || phase->type(rc) == Type::TOP) |
10278 | 1293 return false; // Wait stable graph |
1294 Node* in = phi->in(i); | |
1295 if (in == NULL || phase->type(in) == Type::TOP) | |
1296 return false; // Wait stable graph | |
1297 } | |
1298 return true; | |
1299 } | |
1300 //------------------------------split_through_phi------------------------------ | |
1301 // Split instance or boxed field load through Phi. | |
1302 Node *LoadNode::split_through_phi(PhaseGVN *phase) { | |
1303 Node* mem = in(Memory); | |
1304 Node* address = in(Address); | |
1305 const TypeOopPtr *t_oop = phase->type(address)->isa_oopptr(); | |
1306 | |
1307 assert((t_oop != NULL) && | |
1308 (t_oop->is_known_instance_field() || | |
1309 t_oop->is_ptr_to_boxed_value()), "invalide conditions"); | |
1310 | |
1311 Compile* C = phase->C; | |
1312 intptr_t ignore = 0; | |
1313 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); | |
1314 bool base_is_phi = (base != NULL) && base->is_Phi(); | |
1315 bool load_boxed_values = t_oop->is_ptr_to_boxed_value() && C->aggressive_unboxing() && | |
1316 (base != NULL) && (base == address->in(AddPNode::Base)) && | |
1317 phase->type(base)->higher_equal(TypePtr::NOTNULL); | |
1318 | |
1319 if (!((mem->is_Phi() || base_is_phi) && | |
1320 (load_boxed_values || t_oop->is_known_instance_field()))) { | |
1321 return NULL; // memory is not Phi | |
1322 } | |
1323 | |
1324 if (mem->is_Phi()) { | |
1325 if (!stable_phi(mem->as_Phi(), phase)) { | |
163 | 1326 return NULL; // Wait stable graph |
1327 } | |
10278 | 1328 uint cnt = mem->req(); |
1329 // Check for loop invariant memory. | |
1330 if (cnt == 3) { | |
1331 for (uint i = 1; i < cnt; i++) { | |
1332 Node* in = mem->in(i); | |
1333 Node* m = optimize_memory_chain(in, t_oop, this, phase); | |
1334 if (m == mem) { | |
1335 set_req(Memory, mem->in(cnt - i)); | |
1336 return this; // made change | |
1337 } | |
163 | 1338 } |
1339 } | |
1340 } | |
10278 | 1341 if (base_is_phi) { |
1342 if (!stable_phi(base->as_Phi(), phase)) { | |
1343 return NULL; // Wait stable graph | |
1344 } | |
1345 uint cnt = base->req(); | |
1346 // Check for loop invariant memory. | |
1347 if (cnt == 3) { | |
1348 for (uint i = 1; i < cnt; i++) { | |
1349 if (base->in(i) == base) { | |
1350 return NULL; // Wait stable graph | |
1351 } | |
1352 } | |
1353 } | |
1354 } | |
1355 | |
1356 bool load_boxed_phi = load_boxed_values && base_is_phi && (base->in(0) == mem->in(0)); | |
1357 | |
163 | 1358 // Split through Phi (see original code in loopopts.cpp). |
10278 | 1359 assert(C->have_alias_type(t_oop), "instance should have alias type"); |
163 | 1360 |
1361 // Do nothing here if Identity will find a value | |
1362 // (to avoid infinite chain of value phis generation). | |
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1363 if (!phase->eqv(this, this->Identity(phase))) |
163 | 1364 return NULL; |
1365 | |
10278 | 1366 // Select Region to split through. |
1367 Node* region; | |
1368 if (!base_is_phi) { | |
1369 assert(mem->is_Phi(), "sanity"); | |
1370 region = mem->in(0); | |
1371 // Skip if the region dominates some control edge of the address. | |
1372 if (!MemNode::all_controls_dominate(address, region)) | |
1373 return NULL; | |
1374 } else if (!mem->is_Phi()) { | |
1375 assert(base_is_phi, "sanity"); | |
1376 region = base->in(0); | |
1377 // Skip if the region dominates some control edge of the memory. | |
1378 if (!MemNode::all_controls_dominate(mem, region)) | |
1379 return NULL; | |
1380 } else if (base->in(0) != mem->in(0)) { | |
1381 assert(base_is_phi && mem->is_Phi(), "sanity"); | |
1382 if (MemNode::all_controls_dominate(mem, base->in(0))) { | |
1383 region = base->in(0); | |
1384 } else if (MemNode::all_controls_dominate(address, mem->in(0))) { | |
1385 region = mem->in(0); | |
1386 } else { | |
1387 return NULL; // complex graph | |
1388 } | |
1389 } else { | |
1390 assert(base->in(0) == mem->in(0), "sanity"); | |
1391 region = mem->in(0); | |
1392 } | |
163 | 1393 |
1394 const Type* this_type = this->bottom_type(); | |
10278 | 1395 int this_index = C->get_alias_index(t_oop); |
1396 int this_offset = t_oop->offset(); | |
1397 int this_iid = t_oop->instance_id(); | |
1398 if (!t_oop->is_known_instance() && load_boxed_values) { | |
1399 // Use _idx of address base for boxed values. | |
1400 this_iid = base->_idx; | |
1401 } | |
1402 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
1403 Node* phi = new (C) PhiNode(region, this_type, NULL, this_iid, this_index, this_offset); | |
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1404 for (uint i = 1; i < region->req(); i++) { |
10278 | 1405 Node* x; |
163 | 1406 Node* the_clone = NULL; |
10278 | 1407 if (region->in(i) == C->top()) { |
1408 x = C->top(); // Dead path? Use a dead data op | |
163 | 1409 } else { |
1410 x = this->clone(); // Else clone up the data op | |
1411 the_clone = x; // Remember for possible deletion. | |
1412 // Alter data node to use pre-phi inputs | |
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1413 if (this->in(0) == region) { |
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1414 x->set_req(0, region->in(i)); |
163 | 1415 } else { |
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1416 x->set_req(0, NULL); |
163 | 1417 } |
10278 | 1418 if (mem->is_Phi() && (mem->in(0) == region)) { |
1419 x->set_req(Memory, mem->in(i)); // Use pre-Phi input for the clone. | |
1420 } | |
1421 if (address->is_Phi() && address->in(0) == region) { | |
1422 x->set_req(Address, address->in(i)); // Use pre-Phi input for the clone | |
1423 } | |
1424 if (base_is_phi && (base->in(0) == region)) { | |
1425 Node* base_x = base->in(i); // Clone address for loads from boxed objects. | |
1426 Node* adr_x = phase->transform(new (C) AddPNode(base_x,base_x,address->in(AddPNode::Offset))); | |
1427 x->set_req(Address, adr_x); | |
163 | 1428 } |
1429 } | |
1430 // Check for a 'win' on some paths | |
1431 const Type *t = x->Value(igvn); | |
1432 | |
1433 bool singleton = t->singleton(); | |
1434 | |
1435 // See comments in PhaseIdealLoop::split_thru_phi(). | |
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1436 if (singleton && t == Type::TOP) { |
163 | 1437 singleton &= region->is_Loop() && (i != LoopNode::EntryControl); |
1438 } | |
1439 | |
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1440 if (singleton) { |
163 | 1441 x = igvn->makecon(t); |
1442 } else { | |
1443 // We now call Identity to try to simplify the cloned node. | |
1444 // Note that some Identity methods call phase->type(this). | |
1445 // Make sure that the type array is big enough for | |
1446 // our new node, even though we may throw the node away. | |
1447 // (This tweaking with igvn only works because x is a new node.) | |
1448 igvn->set_type(x, t); | |
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253
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|
1449 // If x is a TypeNode, capture any more-precise type permanently into Node |
605 | 1450 // otherwise it will be not updated during igvn->transform since |
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1451 // igvn->type(x) is set to x->Value() already. |
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1452 x->raise_bottom_type(t); |
163 | 1453 Node *y = x->Identity(igvn); |
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1454 if (y != x) { |
163 | 1455 x = y; |
1456 } else { | |
10278 | 1457 y = igvn->hash_find_insert(x); |
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1458 if (y) { |
163 | 1459 x = y; |
1460 } else { | |
1461 // Else x is a new node we are keeping | |
1462 // We do not need register_new_node_with_optimizer | |
1463 // because set_type has already been called. | |
1464 igvn->_worklist.push(x); | |
1465 } | |
1466 } | |
1467 } | |
10278 | 1468 if (x != the_clone && the_clone != NULL) { |
163 | 1469 igvn->remove_dead_node(the_clone); |
10278 | 1470 } |
163 | 1471 phi->set_req(i, x); |
1472 } | |
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1473 // Record Phi |
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1474 igvn->register_new_node_with_optimizer(phi); |
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1475 return phi; |
163 | 1476 } |
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1477 |
0 | 1478 //------------------------------Ideal------------------------------------------ |
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1479 // If the load is from Field memory and the pointer is non-null, it might be possible to |
0 | 1480 // zero out the control input. |
1481 // If the offset is constant and the base is an object allocation, | |
1482 // try to hook me up to the exact initializing store. | |
1483 Node *LoadNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1484 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
1485 if (p) return (p == NodeSentinel) ? NULL : p; | |
1486 | |
1487 Node* ctrl = in(MemNode::Control); | |
1488 Node* address = in(MemNode::Address); | |
1489 | |
1490 // Skip up past a SafePoint control. Cannot do this for Stores because | |
1491 // pointer stores & cardmarks must stay on the same side of a SafePoint. | |
1492 if( ctrl != NULL && ctrl->Opcode() == Op_SafePoint && | |
1493 phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw ) { | |
1494 ctrl = ctrl->in(0); | |
1495 set_req(MemNode::Control,ctrl); | |
1496 } | |
1497 | |
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1498 intptr_t ignore = 0; |
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1499 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); |
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1500 if (base != NULL |
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1501 && phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw) { |
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1502 // Check for useless control edge in some common special cases |
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1503 if (in(MemNode::Control) != NULL |
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1504 && can_remove_control() |
0 | 1505 && phase->type(base)->higher_equal(TypePtr::NOTNULL) |
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1506 && all_controls_dominate(base, phase->C->start())) { |
0 | 1507 // A method-invariant, non-null address (constant or 'this' argument). |
1508 set_req(MemNode::Control, NULL); | |
1509 } | |
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1510 } |
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1511 |
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1512 Node* mem = in(MemNode::Memory); |
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1513 const TypePtr *addr_t = phase->type(address)->isa_ptr(); |
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1514 |
10278 | 1515 if (can_reshape && (addr_t != NULL)) { |
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1516 // try to optimize our memory input |
10278 | 1517 Node* opt_mem = MemNode::optimize_memory_chain(mem, addr_t, this, phase); |
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1518 if (opt_mem != mem) { |
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1519 set_req(MemNode::Memory, opt_mem); |
305 | 1520 if (phase->type( opt_mem ) == Type::TOP) return NULL; |
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1521 return this; |
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1522 } |
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1523 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); |
10278 | 1524 if ((t_oop != NULL) && |
1525 (t_oop->is_known_instance_field() || | |
1526 t_oop->is_ptr_to_boxed_value())) { | |
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1527 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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1528 if (igvn != NULL && igvn->_worklist.member(opt_mem)) { |
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1529 // Delay this transformation until memory Phi is processed. |
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1530 phase->is_IterGVN()->_worklist.push(this); |
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1531 return NULL; |
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1532 } |
163 | 1533 // Split instance field load through Phi. |
1534 Node* result = split_through_phi(phase); | |
1535 if (result != NULL) return result; | |
10278 | 1536 |
1537 if (t_oop->is_ptr_to_boxed_value()) { | |
1538 Node* result = eliminate_autobox(phase); | |
1539 if (result != NULL) return result; | |
1540 } | |
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1541 } |
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1542 } |
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1543 |
0 | 1544 // Check for prior store with a different base or offset; make Load |
1545 // independent. Skip through any number of them. Bail out if the stores | |
1546 // are in an endless dead cycle and report no progress. This is a key | |
1547 // transform for Reflection. However, if after skipping through the Stores | |
1548 // we can't then fold up against a prior store do NOT do the transform as | |
1549 // this amounts to using the 'Oracle' model of aliasing. It leaves the same | |
1550 // array memory alive twice: once for the hoisted Load and again after the | |
1551 // bypassed Store. This situation only works if EVERYBODY who does | |
1552 // anti-dependence work knows how to bypass. I.e. we need all | |
1553 // anti-dependence checks to ask the same Oracle. Right now, that Oracle is | |
1554 // the alias index stuff. So instead, peek through Stores and IFF we can | |
1555 // fold up, do so. | |
1556 Node* prev_mem = find_previous_store(phase); | |
1557 // Steps (a), (b): Walk past independent stores to find an exact match. | |
1558 if (prev_mem != NULL && prev_mem != in(MemNode::Memory)) { | |
1559 // (c) See if we can fold up on the spot, but don't fold up here. | |
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1560 // Fold-up might require truncation (for LoadB/LoadS/LoadUS) or |
0 | 1561 // just return a prior value, which is done by Identity calls. |
1562 if (can_see_stored_value(prev_mem, phase)) { | |
1563 // Make ready for step (d): | |
1564 set_req(MemNode::Memory, prev_mem); | |
1565 return this; | |
1566 } | |
1567 } | |
1568 | |
1569 return NULL; // No further progress | |
1570 } | |
1571 | |
1572 // Helper to recognize certain Klass fields which are invariant across | |
1573 // some group of array types (e.g., int[] or all T[] where T < Object). | |
1574 const Type* | |
1575 LoadNode::load_array_final_field(const TypeKlassPtr *tkls, | |
1576 ciKlass* klass) const { | |
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1577 if (tkls->offset() == in_bytes(Klass::modifier_flags_offset())) { |
0 | 1578 // The field is Klass::_modifier_flags. Return its (constant) value. |
1579 // (Folds up the 2nd indirection in aClassConstant.getModifiers().) | |
1580 assert(this->Opcode() == Op_LoadI, "must load an int from _modifier_flags"); | |
1581 return TypeInt::make(klass->modifier_flags()); | |
1582 } | |
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1583 if (tkls->offset() == in_bytes(Klass::access_flags_offset())) { |
0 | 1584 // The field is Klass::_access_flags. Return its (constant) value. |
1585 // (Folds up the 2nd indirection in Reflection.getClassAccessFlags(aClassConstant).) | |
1586 assert(this->Opcode() == Op_LoadI, "must load an int from _access_flags"); | |
1587 return TypeInt::make(klass->access_flags()); | |
1588 } | |
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1589 if (tkls->offset() == in_bytes(Klass::layout_helper_offset())) { |
0 | 1590 // The field is Klass::_layout_helper. Return its constant value if known. |
1591 assert(this->Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1592 return TypeInt::make(klass->layout_helper()); | |
1593 } | |
1594 | |
1595 // No match. | |
1596 return NULL; | |
1597 } | |
1598 | |
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1599 // Try to constant-fold a stable array element. |
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1600 static const Type* fold_stable_ary_elem(const TypeAryPtr* ary, int off, BasicType loadbt) { |
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1601 assert(ary->const_oop(), "array should be constant"); |
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1602 assert(ary->is_stable(), "array should be stable"); |
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1603 |
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1604 // Decode the results of GraphKit::array_element_address. |
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1605 ciArray* aobj = ary->const_oop()->as_array(); |
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1606 ciConstant con = aobj->element_value_by_offset(off); |
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1607 |
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1608 if (con.basic_type() != T_ILLEGAL && !con.is_null_or_zero()) { |
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1609 const Type* con_type = Type::make_from_constant(con); |
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1610 if (con_type != NULL) { |
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1611 if (con_type->isa_aryptr()) { |
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1612 // Join with the array element type, in case it is also stable. |
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1613 int dim = ary->stable_dimension(); |
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1614 con_type = con_type->is_aryptr()->cast_to_stable(true, dim-1); |
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1615 } |
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1616 if (loadbt == T_NARROWOOP && con_type->isa_oopptr()) { |
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1617 con_type = con_type->make_narrowoop(); |
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1618 } |
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1619 #ifndef PRODUCT |
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1620 if (TraceIterativeGVN) { |
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1621 tty->print("FoldStableValues: array element [off=%d]: con_type=", off); |
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1622 con_type->dump(); tty->cr(); |
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1623 } |
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1624 #endif //PRODUCT |
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1625 return con_type; |
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1626 } |
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1627 } |
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1628 return NULL; |
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1629 } |
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1630 |
0 | 1631 //------------------------------Value----------------------------------------- |
1632 const Type *LoadNode::Value( PhaseTransform *phase ) const { | |
1633 // Either input is TOP ==> the result is TOP | |
1634 Node* mem = in(MemNode::Memory); | |
1635 const Type *t1 = phase->type(mem); | |
1636 if (t1 == Type::TOP) return Type::TOP; | |
1637 Node* adr = in(MemNode::Address); | |
1638 const TypePtr* tp = phase->type(adr)->isa_ptr(); | |
1639 if (tp == NULL || tp->empty()) return Type::TOP; | |
1640 int off = tp->offset(); | |
1641 assert(off != Type::OffsetTop, "case covered by TypePtr::empty"); | |
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1642 Compile* C = phase->C; |
0 | 1643 |
1644 // Try to guess loaded type from pointer type | |
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1645 if (tp->isa_aryptr()) { |
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1646 const TypeAryPtr* ary = tp->is_aryptr(); |
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1647 const Type* t = ary->elem(); |
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1648 |
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1649 // Determine whether the reference is beyond the header or not, by comparing |
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1650 // the offset against the offset of the start of the array's data. |
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1651 // Different array types begin at slightly different offsets (12 vs. 16). |
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1652 // We choose T_BYTE as an example base type that is least restrictive |
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1653 // as to alignment, which will therefore produce the smallest |
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1654 // possible base offset. |
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1655 const int min_base_off = arrayOopDesc::base_offset_in_bytes(T_BYTE); |
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1656 const bool off_beyond_header = ((uint)off >= (uint)min_base_off); |
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1657 |
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1658 // Try to constant-fold a stable array element. |
17818
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1659 if (FoldStableValues && ary->is_stable() && ary->const_oop() != NULL) { |
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1660 // Make sure the reference is not into the header and the offset is constant |
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1661 if (off_beyond_header && adr->is_AddP() && off != Type::OffsetBot) { |
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1662 const Type* con_type = fold_stable_ary_elem(ary, off, memory_type()); |
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1663 if (con_type != NULL) { |
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1664 return con_type; |
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1665 } |
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1666 } |
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1667 } |
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1668 |
0 | 1669 // Don't do this for integer types. There is only potential profit if |
1670 // the element type t is lower than _type; that is, for int types, if _type is | |
1671 // more restrictive than t. This only happens here if one is short and the other | |
1672 // char (both 16 bits), and in those cases we've made an intentional decision | |
1673 // to use one kind of load over the other. See AndINode::Ideal and 4965907. | |
1674 // Also, do not try to narrow the type for a LoadKlass, regardless of offset. | |
1675 // | |
1676 // Yes, it is possible to encounter an expression like (LoadKlass p1:(AddP x x 8)) | |
1677 // where the _gvn.type of the AddP is wider than 8. This occurs when an earlier | |
1678 // copy p0 of (AddP x x 8) has been proven equal to p1, and the p0 has been | |
1679 // subsumed by p1. If p1 is on the worklist but has not yet been re-transformed, | |
1680 // it is possible that p1 will have a type like Foo*[int+]:NotNull*+any. | |
1681 // In fact, that could have been the original type of p1, and p1 could have | |
1682 // had an original form like p1:(AddP x x (LShiftL quux 3)), where the | |
1683 // expression (LShiftL quux 3) independently optimized to the constant 8. | |
1684 if ((t->isa_int() == NULL) && (t->isa_long() == NULL) | |
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1685 && (_type->isa_vect() == NULL) |
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1686 && Opcode() != Op_LoadKlass && Opcode() != Op_LoadNKlass) { |
0 | 1687 // t might actually be lower than _type, if _type is a unique |
1688 // concrete subclass of abstract class t. | |
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1689 if (off_beyond_header) { // is the offset beyond the header? |
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1690 const Type* jt = t->join_speculative(_type); |
0 | 1691 // In any case, do not allow the join, per se, to empty out the type. |
1692 if (jt->empty() && !t->empty()) { | |
1693 // This can happen if a interface-typed array narrows to a class type. | |
1694 jt = _type; | |
1695 } | |
10278 | 1696 #ifdef ASSERT |
1697 if (phase->C->eliminate_boxing() && adr->is_AddP()) { | |
17
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1698 // The pointers in the autobox arrays are always non-null |
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1699 Node* base = adr->in(AddPNode::Base); |
10278 | 1700 if ((base != NULL) && base->is_DecodeN()) { |
1701 // Get LoadN node which loads IntegerCache.cache field | |
1702 base = base->in(1); | |
1703 } | |
1704 if ((base != NULL) && base->is_Con()) { | |
1705 const TypeAryPtr* base_type = base->bottom_type()->isa_aryptr(); | |
1706 if ((base_type != NULL) && base_type->is_autobox_cache()) { | |
1707 // It could be narrow oop | |
1708 assert(jt->make_ptr()->ptr() == TypePtr::NotNull,"sanity"); | |
17
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1709 } |
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1710 } |
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1711 } |
10278 | 1712 #endif |
0 | 1713 return jt; |
1714 } | |
1715 } | |
1716 } else if (tp->base() == Type::InstPtr) { | |
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1717 ciEnv* env = C->env(); |
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1718 const TypeInstPtr* tinst = tp->is_instptr(); |
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1719 ciKlass* klass = tinst->klass(); |
0 | 1720 assert( off != Type::OffsetBot || |
1721 // arrays can be cast to Objects | |
1722 tp->is_oopptr()->klass()->is_java_lang_Object() || | |
1723 // unsafe field access may not have a constant offset | |
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1724 C->has_unsafe_access(), |
0 | 1725 "Field accesses must be precise" ); |
1726 // For oop loads, we expect the _type to be precise | |
3902
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1727 if (klass == env->String_klass() && |
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1728 adr->is_AddP() && off != Type::OffsetBot) { |
2320
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1729 // For constant Strings treat the final fields as compile time constants. |
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1730 Node* base = adr->in(AddPNode::Base); |
1766
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1731 const TypeOopPtr* t = phase->type(base)->isa_oopptr(); |
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1732 if (t != NULL && t->singleton()) { |
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1733 ciField* field = env->String_klass()->get_field_by_offset(off, false); |
2320
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1734 if (field != NULL && field->is_final()) { |
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1735 ciObject* string = t->const_oop(); |
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1736 ciConstant constant = string->as_instance()->field_value(field); |
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1737 if (constant.basic_type() == T_INT) { |
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1738 return TypeInt::make(constant.as_int()); |
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1739 } else if (constant.basic_type() == T_ARRAY) { |
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1740 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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1741 return TypeNarrowOop::make_from_constant(constant.as_object(), true); |
2320
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1742 } else { |
2379
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1743 return TypeOopPtr::make_from_constant(constant.as_object(), true); |
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1744 } |
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1745 } |
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1746 } |
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1747 } |
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1748 } |
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1749 // Optimizations for constant objects |
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1750 ciObject* const_oop = tinst->const_oop(); |
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1751 if (const_oop != NULL) { |
10278 | 1752 // For constant Boxed value treat the target field as a compile time constant. |
1753 if (tinst->is_ptr_to_boxed_value()) { | |
1754 return tinst->get_const_boxed_value(); | |
1755 } else | |
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1756 // For constant CallSites treat the target field as a compile time constant. |
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1757 if (const_oop->is_call_site()) { |
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1758 ciCallSite* call_site = const_oop->as_call_site(); |
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1759 ciField* field = call_site->klass()->as_instance_klass()->get_field_by_offset(off, /*is_static=*/ false); |
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1760 if (field != NULL && field->is_call_site_target()) { |
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1761 ciMethodHandle* target = call_site->get_target(); |
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1762 if (target != NULL) { // just in case |
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1763 ciConstant constant(T_OBJECT, target); |
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1764 const Type* t; |
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1765 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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1766 t = TypeNarrowOop::make_from_constant(constant.as_object(), true); |
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1767 } else { |
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1768 t = TypeOopPtr::make_from_constant(constant.as_object(), true); |
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1769 } |
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1770 // Add a dependence for invalidation of the optimization. |
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1771 if (!call_site->is_constant_call_site()) { |
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1772 C->dependencies()->assert_call_site_target_value(call_site, target); |
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|
1773 } |
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|
1774 return t; |
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|
1775 } |
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|
1776 } |
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1777 } |
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1778 } |
0 | 1779 } else if (tp->base() == Type::KlassPtr) { |
1780 assert( off != Type::OffsetBot || | |
1781 // arrays can be cast to Objects | |
1782 tp->is_klassptr()->klass()->is_java_lang_Object() || | |
1783 // also allow array-loading from the primary supertype | |
1784 // array during subtype checks | |
1785 Opcode() == Op_LoadKlass, | |
1786 "Field accesses must be precise" ); | |
1787 // For klass/static loads, we expect the _type to be precise | |
1788 } | |
1789 | |
1790 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1791 if (tkls != NULL && !StressReflectiveCode) { | |
1792 ciKlass* klass = tkls->klass(); | |
1793 if (klass->is_loaded() && tkls->klass_is_exact()) { | |
1794 // We are loading a field from a Klass metaobject whose identity | |
1795 // is known at compile time (the type is "exact" or "precise"). | |
1796 // Check for fields we know are maintained as constants by the VM. | |
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1797 if (tkls->offset() == in_bytes(Klass::super_check_offset_offset())) { |
0 | 1798 // The field is Klass::_super_check_offset. Return its (constant) value. |
1799 // (Folds up type checking code.) | |
1800 assert(Opcode() == Op_LoadI, "must load an int from _super_check_offset"); | |
1801 return TypeInt::make(klass->super_check_offset()); | |
1802 } | |
1803 // Compute index into primary_supers array | |
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1804 juint depth = (tkls->offset() - in_bytes(Klass::primary_supers_offset())) / sizeof(Klass*); |
0 | 1805 // Check for overflowing; use unsigned compare to handle the negative case. |
1806 if( depth < ciKlass::primary_super_limit() ) { | |
1807 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1808 // (Folds up type checking code.) | |
1809 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1810 ciKlass *ss = klass->super_of_depth(depth); | |
1811 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1812 } | |
1813 const Type* aift = load_array_final_field(tkls, klass); | |
1814 if (aift != NULL) return aift; | |
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1815 if (tkls->offset() == in_bytes(ArrayKlass::component_mirror_offset()) |
0 | 1816 && klass->is_array_klass()) { |
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1817 // The field is ArrayKlass::_component_mirror. Return its (constant) value. |
0 | 1818 // (Folds up aClassConstant.getComponentType, common in Arrays.copyOf.) |
1819 assert(Opcode() == Op_LoadP, "must load an oop from _component_mirror"); | |
1820 return TypeInstPtr::make(klass->as_array_klass()->component_mirror()); | |
1821 } | |
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1822 if (tkls->offset() == in_bytes(Klass::java_mirror_offset())) { |
0 | 1823 // The field is Klass::_java_mirror. Return its (constant) value. |
1824 // (Folds up the 2nd indirection in anObjConstant.getClass().) | |
1825 assert(Opcode() == Op_LoadP, "must load an oop from _java_mirror"); | |
1826 return TypeInstPtr::make(klass->java_mirror()); | |
1827 } | |
1828 } | |
1829 | |
1830 // We can still check if we are loading from the primary_supers array at a | |
1831 // shallow enough depth. Even though the klass is not exact, entries less | |
1832 // than or equal to its super depth are correct. | |
1833 if (klass->is_loaded() ) { | |
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1834 ciType *inner = klass; |
0 | 1835 while( inner->is_obj_array_klass() ) |
1836 inner = inner->as_obj_array_klass()->base_element_type(); | |
1837 if( inner->is_instance_klass() && | |
1838 !inner->as_instance_klass()->flags().is_interface() ) { | |
1839 // Compute index into primary_supers array | |
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1840 juint depth = (tkls->offset() - in_bytes(Klass::primary_supers_offset())) / sizeof(Klass*); |
0 | 1841 // Check for overflowing; use unsigned compare to handle the negative case. |
1842 if( depth < ciKlass::primary_super_limit() && | |
1843 depth <= klass->super_depth() ) { // allow self-depth checks to handle self-check case | |
1844 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1845 // (Folds up type checking code.) | |
1846 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1847 ciKlass *ss = klass->super_of_depth(depth); | |
1848 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1849 } | |
1850 } | |
1851 } | |
1852 | |
1853 // If the type is enough to determine that the thing is not an array, | |
1854 // we can give the layout_helper a positive interval type. | |
1855 // This will help short-circuit some reflective code. | |
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1856 if (tkls->offset() == in_bytes(Klass::layout_helper_offset()) |
0 | 1857 && !klass->is_array_klass() // not directly typed as an array |
1858 && !klass->is_interface() // specifically not Serializable & Cloneable | |
1859 && !klass->is_java_lang_Object() // not the supertype of all T[] | |
1860 ) { | |
1861 // Note: When interfaces are reliable, we can narrow the interface | |
1862 // test to (klass != Serializable && klass != Cloneable). | |
1863 assert(Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1864 jint min_size = Klass::instance_layout_helper(oopDesc::header_size(), false); | |
1865 // The key property of this type is that it folds up tests | |
1866 // for array-ness, since it proves that the layout_helper is positive. | |
1867 // Thus, a generic value like the basic object layout helper works fine. | |
1868 return TypeInt::make(min_size, max_jint, Type::WidenMin); | |
1869 } | |
1870 } | |
1871 | |
1872 // If we are loading from a freshly-allocated object, produce a zero, | |
1873 // if the load is provably beyond the header of the object. | |
1874 // (Also allow a variable load from a fresh array to produce zero.) | |
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1875 const TypeOopPtr *tinst = tp->isa_oopptr(); |
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1876 bool is_instance = (tinst != NULL) && tinst->is_known_instance_field(); |
10278 | 1877 bool is_boxed_value = (tinst != NULL) && tinst->is_ptr_to_boxed_value(); |
1878 if (ReduceFieldZeroing || is_instance || is_boxed_value) { | |
0 | 1879 Node* value = can_see_stored_value(mem,phase); |
4815 | 1880 if (value != NULL && value->is_Con()) { |
1881 assert(value->bottom_type()->higher_equal(_type),"sanity"); | |
0 | 1882 return value->bottom_type(); |
4815 | 1883 } |
0 | 1884 } |
1885 | |
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1886 if (is_instance) { |
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1887 // If we have an instance type and our memory input is the |
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1888 // programs's initial memory state, there is no matching store, |
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1889 // so just return a zero of the appropriate type |
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1890 Node *mem = in(MemNode::Memory); |
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1891 if (mem->is_Parm() && mem->in(0)->is_Start()) { |
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1892 assert(mem->as_Parm()->_con == TypeFunc::Memory, "must be memory Parm"); |
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1893 return Type::get_zero_type(_type->basic_type()); |
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1894 } |
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1895 } |
0 | 1896 return _type; |
1897 } | |
1898 | |
1899 //------------------------------match_edge------------------------------------- | |
1900 // Do we Match on this edge index or not? Match only the address. | |
1901 uint LoadNode::match_edge(uint idx) const { | |
1902 return idx == MemNode::Address; | |
1903 } | |
1904 | |
1905 //--------------------------LoadBNode::Ideal-------------------------------------- | |
1906 // | |
1907 // If the previous store is to the same address as this load, | |
1908 // and the value stored was larger than a byte, replace this load | |
1909 // with the value stored truncated to a byte. If no truncation is | |
1910 // needed, the replacement is done in LoadNode::Identity(). | |
1911 // | |
1912 Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1913 Node* mem = in(MemNode::Memory); | |
1914 Node* value = can_see_stored_value(mem,phase); | |
1915 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
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1916 Node *result = phase->transform( new (phase->C) LShiftINode(value, phase->intcon(24)) ); |
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1917 return new (phase->C) RShiftINode(result, phase->intcon(24)); |
0 | 1918 } |
1919 // Identity call will handle the case where truncation is not needed. | |
1920 return LoadNode::Ideal(phase, can_reshape); | |
1921 } | |
1922 | |
4815 | 1923 const Type* LoadBNode::Value(PhaseTransform *phase) const { |
1924 Node* mem = in(MemNode::Memory); | |
1925 Node* value = can_see_stored_value(mem,phase); | |
4821 | 1926 if (value != NULL && value->is_Con() && |
1927 !value->bottom_type()->higher_equal(_type)) { | |
4815 | 1928 // If the input to the store does not fit with the load's result type, |
1929 // it must be truncated. We can't delay until Ideal call since | |
1930 // a singleton Value is needed for split_thru_phi optimization. | |
1931 int con = value->get_int(); | |
1932 return TypeInt::make((con << 24) >> 24); | |
1933 } | |
1934 return LoadNode::Value(phase); | |
1935 } | |
1936 | |
624 | 1937 //--------------------------LoadUBNode::Ideal------------------------------------- |
1938 // | |
1939 // If the previous store is to the same address as this load, | |
1940 // and the value stored was larger than a byte, replace this load | |
1941 // with the value stored truncated to a byte. If no truncation is | |
1942 // needed, the replacement is done in LoadNode::Identity(). | |
1943 // | |
1944 Node* LoadUBNode::Ideal(PhaseGVN* phase, bool can_reshape) { | |
1945 Node* mem = in(MemNode::Memory); | |
1946 Node* value = can_see_stored_value(mem, phase); | |
1947 if (value && !phase->type(value)->higher_equal(_type)) | |
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1948 return new (phase->C) AndINode(value, phase->intcon(0xFF)); |
624 | 1949 // Identity call will handle the case where truncation is not needed. |
1950 return LoadNode::Ideal(phase, can_reshape); | |
1951 } | |
1952 | |
4815 | 1953 const Type* LoadUBNode::Value(PhaseTransform *phase) const { |
1954 Node* mem = in(MemNode::Memory); | |
1955 Node* value = can_see_stored_value(mem,phase); | |
4821 | 1956 if (value != NULL && value->is_Con() && |
1957 !value->bottom_type()->higher_equal(_type)) { | |
4815 | 1958 // If the input to the store does not fit with the load's result type, |
1959 // it must be truncated. We can't delay until Ideal call since | |
1960 // a singleton Value is needed for split_thru_phi optimization. | |
1961 int con = value->get_int(); | |
1962 return TypeInt::make(con & 0xFF); | |
1963 } | |
1964 return LoadNode::Value(phase); | |
1965 } | |
1966 | |
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1967 //--------------------------LoadUSNode::Ideal------------------------------------- |
0 | 1968 // |
1969 // If the previous store is to the same address as this load, | |
1970 // and the value stored was larger than a char, replace this load | |
1971 // with the value stored truncated to a char. If no truncation is | |
1972 // needed, the replacement is done in LoadNode::Identity(). | |
1973 // | |
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1974 Node *LoadUSNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
0 | 1975 Node* mem = in(MemNode::Memory); |
1976 Node* value = can_see_stored_value(mem,phase); | |
1977 if( value && !phase->type(value)->higher_equal( _type ) ) | |
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1978 return new (phase->C) AndINode(value,phase->intcon(0xFFFF)); |
0 | 1979 // Identity call will handle the case where truncation is not needed. |
1980 return LoadNode::Ideal(phase, can_reshape); | |
1981 } | |
1982 | |
4815 | 1983 const Type* LoadUSNode::Value(PhaseTransform *phase) const { |
1984 Node* mem = in(MemNode::Memory); | |
1985 Node* value = can_see_stored_value(mem,phase); | |
4821 | 1986 if (value != NULL && value->is_Con() && |
1987 !value->bottom_type()->higher_equal(_type)) { | |
4815 | 1988 // If the input to the store does not fit with the load's result type, |
1989 // it must be truncated. We can't delay until Ideal call since | |
1990 // a singleton Value is needed for split_thru_phi optimization. | |
1991 int con = value->get_int(); | |
1992 return TypeInt::make(con & 0xFFFF); | |
1993 } | |
1994 return LoadNode::Value(phase); | |
1995 } | |
1996 | |
0 | 1997 //--------------------------LoadSNode::Ideal-------------------------------------- |
1998 // | |
1999 // If the previous store is to the same address as this load, | |
2000 // and the value stored was larger than a short, replace this load | |
2001 // with the value stored truncated to a short. If no truncation is | |
2002 // needed, the replacement is done in LoadNode::Identity(). | |
2003 // | |
2004 Node *LoadSNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
2005 Node* mem = in(MemNode::Memory); | |
2006 Node* value = can_see_stored_value(mem,phase); | |
2007 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
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2008 Node *result = phase->transform( new (phase->C) LShiftINode(value, phase->intcon(16)) ); |
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2009 return new (phase->C) RShiftINode(result, phase->intcon(16)); |
0 | 2010 } |
2011 // Identity call will handle the case where truncation is not needed. | |
2012 return LoadNode::Ideal(phase, can_reshape); | |
2013 } | |
2014 | |
4815 | 2015 const Type* LoadSNode::Value(PhaseTransform *phase) const { |
2016 Node* mem = in(MemNode::Memory); | |
2017 Node* value = can_see_stored_value(mem,phase); | |
4821 | 2018 if (value != NULL && value->is_Con() && |
2019 !value->bottom_type()->higher_equal(_type)) { | |
4815 | 2020 // If the input to the store does not fit with the load's result type, |
2021 // it must be truncated. We can't delay until Ideal call since | |
2022 // a singleton Value is needed for split_thru_phi optimization. | |
2023 int con = value->get_int(); | |
2024 return TypeInt::make((con << 16) >> 16); | |
2025 } | |
2026 return LoadNode::Value(phase); | |
2027 } | |
2028 | |
0 | 2029 //============================================================================= |
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2030 //----------------------------LoadKlassNode::make------------------------------ |
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2031 // Polymorphic factory method: |
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2032 Node* LoadKlassNode::make(PhaseGVN& gvn, Node* ctl, Node *mem, Node *adr, const TypePtr* at, const TypeKlassPtr *tk) { |
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2033 Compile* C = gvn.C; |
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2034 // sanity check the alias category against the created node type |
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2035 const TypePtr *adr_type = adr->bottom_type()->isa_ptr(); |
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2036 assert(adr_type != NULL, "expecting TypeKlassPtr"); |
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2037 #ifdef _LP64 |
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2038 if (adr_type->is_ptr_to_narrowklass()) { |
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2039 assert(UseCompressedClassPointers, "no compressed klasses"); |
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2040 Node* load_klass = gvn.transform(new (C) LoadNKlassNode(ctl, mem, adr, at, tk->make_narrowklass(), MemNode::unordered)); |
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2041 return new (C) DecodeNKlassNode(load_klass, load_klass->bottom_type()->make_ptr()); |
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2042 } |
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2043 #endif |
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2044 assert(!adr_type->is_ptr_to_narrowklass() && !adr_type->is_ptr_to_narrowoop(), "should have got back a narrow oop"); |
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2045 return new (C) LoadKlassNode(ctl, mem, adr, at, tk, MemNode::unordered); |
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2046 } |
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2047 |
0 | 2048 //------------------------------Value------------------------------------------ |
2049 const Type *LoadKlassNode::Value( PhaseTransform *phase ) const { | |
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2050 return klass_value_common(phase); |
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2051 } |
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2052 |
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2053 // In most cases, LoadKlassNode does not have the control input set. If the control |
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2054 // input is set, it must not be removed (by LoadNode::Ideal()). |
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2055 bool LoadKlassNode::can_remove_control() const { |
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2056 return false; |
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2057 } |
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2058 |
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2059 const Type *LoadNode::klass_value_common( PhaseTransform *phase ) const { |
0 | 2060 // Either input is TOP ==> the result is TOP |
2061 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2062 if (t1 == Type::TOP) return Type::TOP; | |
2063 Node *adr = in(MemNode::Address); | |
2064 const Type *t2 = phase->type( adr ); | |
2065 if (t2 == Type::TOP) return Type::TOP; | |
2066 const TypePtr *tp = t2->is_ptr(); | |
2067 if (TypePtr::above_centerline(tp->ptr()) || | |
2068 tp->ptr() == TypePtr::Null) return Type::TOP; | |
2069 | |
2070 // Return a more precise klass, if possible | |
2071 const TypeInstPtr *tinst = tp->isa_instptr(); | |
2072 if (tinst != NULL) { | |
2073 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
2074 int offset = tinst->offset(); | |
2075 if (ik == phase->C->env()->Class_klass() | |
2076 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
2077 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
2078 // We are loading a special hidden field from a Class mirror object, | |
2079 // the field which points to the VM's Klass metaobject. | |
2080 ciType* t = tinst->java_mirror_type(); | |
2081 // java_mirror_type returns non-null for compile-time Class constants. | |
2082 if (t != NULL) { | |
2083 // constant oop => constant klass | |
2084 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
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2085 if (t->is_void()) { |
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2086 // We cannot create a void array. Since void is a primitive type return null |
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2087 // klass. Users of this result need to do a null check on the returned klass. |
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2088 return TypePtr::NULL_PTR; |
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2089 } |
0 | 2090 return TypeKlassPtr::make(ciArrayKlass::make(t)); |
2091 } | |
2092 if (!t->is_klass()) { | |
2093 // a primitive Class (e.g., int.class) has NULL for a klass field | |
2094 return TypePtr::NULL_PTR; | |
2095 } | |
2096 // (Folds up the 1st indirection in aClassConstant.getModifiers().) | |
2097 return TypeKlassPtr::make(t->as_klass()); | |
2098 } | |
2099 // non-constant mirror, so we can't tell what's going on | |
2100 } | |
2101 if( !ik->is_loaded() ) | |
2102 return _type; // Bail out if not loaded | |
2103 if (offset == oopDesc::klass_offset_in_bytes()) { | |
2104 if (tinst->klass_is_exact()) { | |
2105 return TypeKlassPtr::make(ik); | |
2106 } | |
2107 // See if we can become precise: no subklasses and no interface | |
2108 // (Note: We need to support verified interfaces.) | |
2109 if (!ik->is_interface() && !ik->has_subklass()) { | |
2110 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
2111 // Add a dependence; if any subclass added we need to recompile | |
2112 if (!ik->is_final()) { | |
2113 // %%% should use stronger assert_unique_concrete_subtype instead | |
2114 phase->C->dependencies()->assert_leaf_type(ik); | |
2115 } | |
2116 // Return precise klass | |
2117 return TypeKlassPtr::make(ik); | |
2118 } | |
2119 | |
2120 // Return root of possible klass | |
2121 return TypeKlassPtr::make(TypePtr::NotNull, ik, 0/*offset*/); | |
2122 } | |
2123 } | |
2124 | |
2125 // Check for loading klass from an array | |
2126 const TypeAryPtr *tary = tp->isa_aryptr(); | |
2127 if( tary != NULL ) { | |
2128 ciKlass *tary_klass = tary->klass(); | |
2129 if (tary_klass != NULL // can be NULL when at BOTTOM or TOP | |
2130 && tary->offset() == oopDesc::klass_offset_in_bytes()) { | |
2131 if (tary->klass_is_exact()) { | |
2132 return TypeKlassPtr::make(tary_klass); | |
2133 } | |
2134 ciArrayKlass *ak = tary->klass()->as_array_klass(); | |
2135 // If the klass is an object array, we defer the question to the | |
2136 // array component klass. | |
2137 if( ak->is_obj_array_klass() ) { | |
2138 assert( ak->is_loaded(), "" ); | |
2139 ciKlass *base_k = ak->as_obj_array_klass()->base_element_klass(); | |
2140 if( base_k->is_loaded() && base_k->is_instance_klass() ) { | |
2141 ciInstanceKlass* ik = base_k->as_instance_klass(); | |
2142 // See if we can become precise: no subklasses and no interface | |
2143 if (!ik->is_interface() && !ik->has_subklass()) { | |
2144 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
2145 // Add a dependence; if any subclass added we need to recompile | |
2146 if (!ik->is_final()) { | |
2147 phase->C->dependencies()->assert_leaf_type(ik); | |
2148 } | |
2149 // Return precise array klass | |
2150 return TypeKlassPtr::make(ak); | |
2151 } | |
2152 } | |
2153 return TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
2154 } else { // Found a type-array? | |
2155 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
2156 assert( ak->is_type_array_klass(), "" ); | |
2157 return TypeKlassPtr::make(ak); // These are always precise | |
2158 } | |
2159 } | |
2160 } | |
2161 | |
2162 // Check for loading klass from an array klass | |
2163 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
2164 if (tkls != NULL && !StressReflectiveCode) { | |
2165 ciKlass* klass = tkls->klass(); | |
2166 if( !klass->is_loaded() ) | |
2167 return _type; // Bail out if not loaded | |
2168 if( klass->is_obj_array_klass() && | |
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2169 tkls->offset() == in_bytes(ObjArrayKlass::element_klass_offset())) { |
0 | 2170 ciKlass* elem = klass->as_obj_array_klass()->element_klass(); |
2171 // // Always returning precise element type is incorrect, | |
2172 // // e.g., element type could be object and array may contain strings | |
2173 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0); | |
2174 | |
2175 // The array's TypeKlassPtr was declared 'precise' or 'not precise' | |
2176 // according to the element type's subclassing. | |
2177 return TypeKlassPtr::make(tkls->ptr(), elem, 0/*offset*/); | |
2178 } | |
2179 if( klass->is_instance_klass() && tkls->klass_is_exact() && | |
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2180 tkls->offset() == in_bytes(Klass::super_offset())) { |
0 | 2181 ciKlass* sup = klass->as_instance_klass()->super(); |
2182 // The field is Klass::_super. Return its (constant) value. | |
2183 // (Folds up the 2nd indirection in aClassConstant.getSuperClass().) | |
2184 return sup ? TypeKlassPtr::make(sup) : TypePtr::NULL_PTR; | |
2185 } | |
2186 } | |
2187 | |
2188 // Bailout case | |
2189 return LoadNode::Value(phase); | |
2190 } | |
2191 | |
2192 //------------------------------Identity--------------------------------------- | |
2193 // To clean up reflective code, simplify k.java_mirror.as_klass to plain k. | |
2194 // Also feed through the klass in Allocate(...klass...)._klass. | |
2195 Node* LoadKlassNode::Identity( PhaseTransform *phase ) { | |
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2196 return klass_identity_common(phase); |
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2197 } |
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2198 |
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2199 Node* LoadNode::klass_identity_common(PhaseTransform *phase ) { |
0 | 2200 Node* x = LoadNode::Identity(phase); |
2201 if (x != this) return x; | |
2202 | |
2203 // Take apart the address into an oop and and offset. | |
2204 // Return 'this' if we cannot. | |
2205 Node* adr = in(MemNode::Address); | |
2206 intptr_t offset = 0; | |
2207 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
2208 if (base == NULL) return this; | |
2209 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr(); | |
2210 if (toop == NULL) return this; | |
2211 | |
2212 // We can fetch the klass directly through an AllocateNode. | |
2213 // This works even if the klass is not constant (clone or newArray). | |
2214 if (offset == oopDesc::klass_offset_in_bytes()) { | |
2215 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase); | |
2216 if (allocated_klass != NULL) { | |
2217 return allocated_klass; | |
2218 } | |
2219 } | |
2220 | |
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2221 // Simplify k.java_mirror.as_klass to plain k, where k is a Klass*. |
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2222 // Simplify ak.component_mirror.array_klass to plain ak, ak an ArrayKlass. |
0 | 2223 // See inline_native_Class_query for occurrences of these patterns. |
2224 // Java Example: x.getClass().isAssignableFrom(y) | |
2225 // Java Example: Array.newInstance(x.getClass().getComponentType(), n) | |
2226 // | |
2227 // This improves reflective code, often making the Class | |
2228 // mirror go completely dead. (Current exception: Class | |
2229 // mirrors may appear in debug info, but we could clean them out by | |
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2230 // introducing a new debug info operator for Klass*.java_mirror). |
0 | 2231 if (toop->isa_instptr() && toop->klass() == phase->C->env()->Class_klass() |
2232 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
2233 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
2234 // We are loading a special hidden field from a Class mirror, | |
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2235 // the field which points to its Klass or ArrayKlass metaobject. |
0 | 2236 if (base->is_Load()) { |
2237 Node* adr2 = base->in(MemNode::Address); | |
2238 const TypeKlassPtr* tkls = phase->type(adr2)->isa_klassptr(); | |
2239 if (tkls != NULL && !tkls->empty() | |
2240 && (tkls->klass()->is_instance_klass() || | |
2241 tkls->klass()->is_array_klass()) | |
2242 && adr2->is_AddP() | |
2243 ) { | |
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2244 int mirror_field = in_bytes(Klass::java_mirror_offset()); |
0 | 2245 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { |
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2246 mirror_field = in_bytes(ArrayKlass::component_mirror_offset()); |
0 | 2247 } |
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2248 if (tkls->offset() == mirror_field) { |
0 | 2249 return adr2->in(AddPNode::Base); |
2250 } | |
2251 } | |
2252 } | |
2253 } | |
2254 | |
2255 return this; | |
2256 } | |
2257 | |
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2258 |
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2259 //------------------------------Value------------------------------------------ |
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2260 const Type *LoadNKlassNode::Value( PhaseTransform *phase ) const { |
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2261 const Type *t = klass_value_common(phase); |
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2262 if (t == Type::TOP) |
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2263 return t; |
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2264 |
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2265 return t->make_narrowklass(); |
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2266 } |
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2267 |
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2268 //------------------------------Identity--------------------------------------- |
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2269 // To clean up reflective code, simplify k.java_mirror.as_klass to narrow k. |
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2270 // Also feed through the klass in Allocate(...klass...)._klass. |
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2271 Node* LoadNKlassNode::Identity( PhaseTransform *phase ) { |
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2272 Node *x = klass_identity_common(phase); |
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2273 |
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2274 const Type *t = phase->type( x ); |
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2275 if( t == Type::TOP ) return x; |
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2276 if( t->isa_narrowklass()) return x; |
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2277 assert (!t->isa_narrowoop(), "no narrow oop here"); |
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2278 |
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2279 return phase->transform(new (phase->C) EncodePKlassNode(x, t->make_narrowklass())); |
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2280 } |
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2281 |
0 | 2282 //------------------------------Value----------------------------------------- |
2283 const Type *LoadRangeNode::Value( PhaseTransform *phase ) const { | |
2284 // Either input is TOP ==> the result is TOP | |
2285 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2286 if( t1 == Type::TOP ) return Type::TOP; | |
2287 Node *adr = in(MemNode::Address); | |
2288 const Type *t2 = phase->type( adr ); | |
2289 if( t2 == Type::TOP ) return Type::TOP; | |
2290 const TypePtr *tp = t2->is_ptr(); | |
2291 if (TypePtr::above_centerline(tp->ptr())) return Type::TOP; | |
2292 const TypeAryPtr *tap = tp->isa_aryptr(); | |
2293 if( !tap ) return _type; | |
2294 return tap->size(); | |
2295 } | |
2296 | |
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2297 //-------------------------------Ideal--------------------------------------- |
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2298 // Feed through the length in AllocateArray(...length...)._length. |
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2299 Node *LoadRangeNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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2300 Node* p = MemNode::Ideal_common(phase, can_reshape); |
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2301 if (p) return (p == NodeSentinel) ? NULL : p; |
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2302 |
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2303 // Take apart the address into an oop and and offset. |
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2304 // Return 'this' if we cannot. |
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2305 Node* adr = in(MemNode::Address); |
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2306 intptr_t offset = 0; |
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2307 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); |
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2308 if (base == NULL) return NULL; |
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2309 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); |
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2310 if (tary == NULL) return NULL; |
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2311 |
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2312 // We can fetch the length directly through an AllocateArrayNode. |
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2313 // This works even if the length is not constant (clone or newArray). |
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2314 if (offset == arrayOopDesc::length_offset_in_bytes()) { |
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2315 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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2316 if (alloc != NULL) { |
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2317 Node* allocated_length = alloc->Ideal_length(); |
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2318 Node* len = alloc->make_ideal_length(tary, phase); |
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2319 if (allocated_length != len) { |
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2320 // New CastII improves on this. |
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2321 return len; |
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2322 } |
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2323 } |
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2324 } |
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2325 |
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2326 return NULL; |
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2327 } |
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2328 |
0 | 2329 //------------------------------Identity--------------------------------------- |
2330 // Feed through the length in AllocateArray(...length...)._length. | |
2331 Node* LoadRangeNode::Identity( PhaseTransform *phase ) { | |
2332 Node* x = LoadINode::Identity(phase); | |
2333 if (x != this) return x; | |
2334 | |
2335 // Take apart the address into an oop and and offset. | |
2336 // Return 'this' if we cannot. | |
2337 Node* adr = in(MemNode::Address); | |
2338 intptr_t offset = 0; | |
2339 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
2340 if (base == NULL) return this; | |
2341 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); | |
2342 if (tary == NULL) return this; | |
2343 | |
2344 // We can fetch the length directly through an AllocateArrayNode. | |
2345 // This works even if the length is not constant (clone or newArray). | |
2346 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
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2347 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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2348 if (alloc != NULL) { |
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2349 Node* allocated_length = alloc->Ideal_length(); |
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2350 // Do not allow make_ideal_length to allocate a CastII node. |
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2351 Node* len = alloc->make_ideal_length(tary, phase, false); |
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2352 if (allocated_length == len) { |
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2353 // Return allocated_length only if it would not be improved by a CastII. |
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2354 return allocated_length; |
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|
2355 } |
0 | 2356 } |
2357 } | |
2358 | |
2359 return this; | |
2360 | |
2361 } | |
366
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2362 |
0 | 2363 //============================================================================= |
2364 //---------------------------StoreNode::make----------------------------------- | |
2365 // Polymorphic factory method: | |
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2366 StoreNode* StoreNode::make(PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, BasicType bt, MemOrd mo) { |
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2367 assert((mo == unordered || mo == release), "unexpected"); |
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2368 Compile* C = gvn.C; |
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2369 assert(C->get_alias_index(adr_type) != Compile::AliasIdxRaw || |
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|
2370 ctl != NULL, "raw memory operations should have control edge"); |
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2371 |
0 | 2372 switch (bt) { |
23614 | 2373 case T_BOOLEAN: val = gvn.transform(new (C) AndINode(val, gvn.intcon(0x1))); // Fall through to T_BYTE case |
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2374 case T_BYTE: return new (C) StoreBNode(ctl, mem, adr, adr_type, val, mo); |
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2375 case T_INT: return new (C) StoreINode(ctl, mem, adr, adr_type, val, mo); |
0 | 2376 case T_CHAR: |
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2377 case T_SHORT: return new (C) StoreCNode(ctl, mem, adr, adr_type, val, mo); |
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2378 case T_LONG: return new (C) StoreLNode(ctl, mem, adr, adr_type, val, mo); |
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2379 case T_FLOAT: return new (C) StoreFNode(ctl, mem, adr, adr_type, val, mo); |
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2380 case T_DOUBLE: return new (C) StoreDNode(ctl, mem, adr, adr_type, val, mo); |
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2381 case T_METADATA: |
0 | 2382 case T_ADDRESS: |
113
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2383 case T_OBJECT: |
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2384 #ifdef _LP64 |
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|
2385 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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|
2386 val = gvn.transform(new (C) EncodePNode(val, val->bottom_type()->make_narrowoop())); |
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2387 return new (C) StoreNNode(ctl, mem, adr, adr_type, val, mo); |
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|
2388 } else if (adr->bottom_type()->is_ptr_to_narrowklass() || |
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|
2389 (UseCompressedClassPointers && val->bottom_type()->isa_klassptr() && |
6848
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|
2390 adr->bottom_type()->isa_rawptr())) { |
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|
2391 val = gvn.transform(new (C) EncodePKlassNode(val, val->bottom_type()->make_narrowklass())); |
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|
2392 return new (C) StoreNKlassNode(ctl, mem, adr, adr_type, val, mo); |
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|
2393 } |
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|
2394 #endif |
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|
2395 { |
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|
2396 return new (C) StorePNode(ctl, mem, adr, adr_type, val, mo); |
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2397 } |
0 | 2398 } |
2399 ShouldNotReachHere(); | |
2400 return (StoreNode*)NULL; | |
2401 } | |
2402 | |
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2403 StoreLNode* StoreLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, MemOrd mo) { |
0 | 2404 bool require_atomic = true; |
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2405 return new (C) StoreLNode(ctl, mem, adr, adr_type, val, mo, require_atomic); |
0 | 2406 } |
2407 | |
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|
2408 StoreDNode* StoreDNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, MemOrd mo) { |
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|
2409 bool require_atomic = true; |
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|
2410 return new (C) StoreDNode(ctl, mem, adr, adr_type, val, mo, require_atomic); |
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|
2411 } |
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|
2412 |
0 | 2413 |
2414 //--------------------------bottom_type---------------------------------------- | |
2415 const Type *StoreNode::bottom_type() const { | |
2416 return Type::MEMORY; | |
2417 } | |
2418 | |
2419 //------------------------------hash------------------------------------------- | |
2420 uint StoreNode::hash() const { | |
2421 // unroll addition of interesting fields | |
2422 //return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address) + (uintptr_t)in(ValueIn); | |
2423 | |
2424 // Since they are not commoned, do not hash them: | |
2425 return NO_HASH; | |
2426 } | |
2427 | |
2428 //------------------------------Ideal------------------------------------------ | |
2429 // Change back-to-back Store(, p, x) -> Store(m, p, y) to Store(m, p, x). | |
2430 // When a store immediately follows a relevant allocation/initialization, | |
2431 // try to capture it into the initialization, or hoist it above. | |
2432 Node *StoreNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
2433 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
2434 if (p) return (p == NodeSentinel) ? NULL : p; | |
2435 | |
2436 Node* mem = in(MemNode::Memory); | |
2437 Node* address = in(MemNode::Address); | |
2438 | |
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parents:
2379
diff
changeset
|
2439 // Back-to-back stores to same address? Fold em up. Generally |
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2379
diff
changeset
|
2440 // unsafe if I have intervening uses... Also disallowed for StoreCM |
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2379
diff
changeset
|
2441 // since they must follow each StoreP operation. Redundant StoreCMs |
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2379
diff
changeset
|
2442 // are eliminated just before matching in final_graph_reshape. |
4778 | 2443 if (mem->is_Store() && mem->in(MemNode::Address)->eqv_uncast(address) && |
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2379
diff
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|
2444 mem->Opcode() != Op_StoreCM) { |
0 | 2445 // Looking at a dead closed cycle of memory? |
2446 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal"); | |
2447 | |
2448 assert(Opcode() == mem->Opcode() || | |
2449 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw, | |
2450 "no mismatched stores, except on raw memory"); | |
2451 | |
2452 if (mem->outcnt() == 1 && // check for intervening uses | |
2453 mem->as_Store()->memory_size() <= this->memory_size()) { | |
2454 // If anybody other than 'this' uses 'mem', we cannot fold 'mem' away. | |
2455 // For example, 'mem' might be the final state at a conditional return. | |
2456 // Or, 'mem' might be used by some node which is live at the same time | |
2457 // 'this' is live, which might be unschedulable. So, require exactly | |
2458 // ONE user, the 'this' store, until such time as we clone 'mem' for | |
2459 // each of 'mem's uses (thus making the exactly-1-user-rule hold true). | |
2460 if (can_reshape) { // (%%% is this an anachronism?) | |
2461 set_req_X(MemNode::Memory, mem->in(MemNode::Memory), | |
2462 phase->is_IterGVN()); | |
2463 } else { | |
2464 // It's OK to do this in the parser, since DU info is always accurate, | |
2465 // and the parser always refers to nodes via SafePointNode maps. | |
2466 set_req(MemNode::Memory, mem->in(MemNode::Memory)); | |
2467 } | |
2468 return this; | |
2469 } | |
2470 } | |
2471 | |
2472 // Capture an unaliased, unconditional, simple store into an initializer. | |
2473 // Or, if it is independent of the allocation, hoist it above the allocation. | |
2474 if (ReduceFieldZeroing && /*can_reshape &&*/ | |
2475 mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
2476 InitializeNode* init = mem->in(0)->as_Initialize(); | |
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diff
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|
2477 intptr_t offset = init->can_capture_store(this, phase, can_reshape); |
0 | 2478 if (offset > 0) { |
8116
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|
2479 Node* moved = init->capture_store(this, offset, phase, can_reshape); |
0 | 2480 // If the InitializeNode captured me, it made a raw copy of me, |
2481 // and I need to disappear. | |
2482 if (moved != NULL) { | |
2483 // %%% hack to ensure that Ideal returns a new node: | |
2484 mem = MergeMemNode::make(phase->C, mem); | |
2485 return mem; // fold me away | |
2486 } | |
2487 } | |
2488 } | |
2489 | |
2490 return NULL; // No further progress | |
2491 } | |
2492 | |
2493 //------------------------------Value----------------------------------------- | |
2494 const Type *StoreNode::Value( PhaseTransform *phase ) const { | |
2495 // Either input is TOP ==> the result is TOP | |
2496 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2497 if( t1 == Type::TOP ) return Type::TOP; | |
2498 const Type *t2 = phase->type( in(MemNode::Address) ); | |
2499 if( t2 == Type::TOP ) return Type::TOP; | |
2500 const Type *t3 = phase->type( in(MemNode::ValueIn) ); | |
2501 if( t3 == Type::TOP ) return Type::TOP; | |
2502 return Type::MEMORY; | |
2503 } | |
2504 | |
2505 //------------------------------Identity--------------------------------------- | |
2506 // Remove redundant stores: | |
2507 // Store(m, p, Load(m, p)) changes to m. | |
2508 // Store(, p, x) -> Store(m, p, x) changes to Store(m, p, x). | |
2509 Node *StoreNode::Identity( PhaseTransform *phase ) { | |
2510 Node* mem = in(MemNode::Memory); | |
2511 Node* adr = in(MemNode::Address); | |
2512 Node* val = in(MemNode::ValueIn); | |
2513 | |
2514 // Load then Store? Then the Store is useless | |
2515 if (val->is_Load() && | |
4778 | 2516 val->in(MemNode::Address)->eqv_uncast(adr) && |
2517 val->in(MemNode::Memory )->eqv_uncast(mem) && | |
0 | 2518 val->as_Load()->store_Opcode() == Opcode()) { |
2519 return mem; | |
2520 } | |
2521 | |
2522 // Two stores in a row of the same value? | |
2523 if (mem->is_Store() && | |
4778 | 2524 mem->in(MemNode::Address)->eqv_uncast(adr) && |
2525 mem->in(MemNode::ValueIn)->eqv_uncast(val) && | |
0 | 2526 mem->Opcode() == Opcode()) { |
2527 return mem; | |
2528 } | |
2529 | |
2530 // Store of zero anywhere into a freshly-allocated object? | |
2531 // Then the store is useless. | |
2532 // (It must already have been captured by the InitializeNode.) | |
2533 if (ReduceFieldZeroing && phase->type(val)->is_zero_type()) { | |
2534 // a newly allocated object is already all-zeroes everywhere | |
2535 if (mem->is_Proj() && mem->in(0)->is_Allocate()) { | |
2536 return mem; | |
2537 } | |
2538 | |
2539 // the store may also apply to zero-bits in an earlier object | |
2540 Node* prev_mem = find_previous_store(phase); | |
2541 // Steps (a), (b): Walk past independent stores to find an exact match. | |
2542 if (prev_mem != NULL) { | |
2543 Node* prev_val = can_see_stored_value(prev_mem, phase); | |
2544 if (prev_val != NULL && phase->eqv(prev_val, val)) { | |
2545 // prev_val and val might differ by a cast; it would be good | |
2546 // to keep the more informative of the two. | |
2547 return mem; | |
2548 } | |
2549 } | |
2550 } | |
2551 | |
2552 return this; | |
2553 } | |
2554 | |
2555 //------------------------------match_edge------------------------------------- | |
2556 // Do we Match on this edge index or not? Match only memory & value | |
2557 uint StoreNode::match_edge(uint idx) const { | |
2558 return idx == MemNode::Address || idx == MemNode::ValueIn; | |
2559 } | |
2560 | |
2561 //------------------------------cmp-------------------------------------------- | |
2562 // Do not common stores up together. They generally have to be split | |
2563 // back up anyways, so do not bother. | |
2564 uint StoreNode::cmp( const Node &n ) const { | |
2565 return (&n == this); // Always fail except on self | |
2566 } | |
2567 | |
2568 //------------------------------Ideal_masked_input----------------------------- | |
2569 // Check for a useless mask before a partial-word store | |
2570 // (StoreB ... (AndI valIn conIa) ) | |
2571 // If (conIa & mask == mask) this simplifies to | |
2572 // (StoreB ... (valIn) ) | |
2573 Node *StoreNode::Ideal_masked_input(PhaseGVN *phase, uint mask) { | |
2574 Node *val = in(MemNode::ValueIn); | |
2575 if( val->Opcode() == Op_AndI ) { | |
2576 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2577 if( t && t->is_con() && (t->get_con() & mask) == mask ) { | |
2578 set_req(MemNode::ValueIn, val->in(1)); | |
2579 return this; | |
2580 } | |
2581 } | |
2582 return NULL; | |
2583 } | |
2584 | |
2585 | |
2586 //------------------------------Ideal_sign_extended_input---------------------- | |
2587 // Check for useless sign-extension before a partial-word store | |
2588 // (StoreB ... (RShiftI _ (LShiftI _ valIn conIL ) conIR) ) | |
2589 // If (conIL == conIR && conIR <= num_bits) this simplifies to | |
2590 // (StoreB ... (valIn) ) | |
2591 Node *StoreNode::Ideal_sign_extended_input(PhaseGVN *phase, int num_bits) { | |
2592 Node *val = in(MemNode::ValueIn); | |
2593 if( val->Opcode() == Op_RShiftI ) { | |
2594 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2595 if( t && t->is_con() && (t->get_con() <= num_bits) ) { | |
2596 Node *shl = val->in(1); | |
2597 if( shl->Opcode() == Op_LShiftI ) { | |
2598 const TypeInt *t2 = phase->type( shl->in(2) )->isa_int(); | |
2599 if( t2 && t2->is_con() && (t2->get_con() == t->get_con()) ) { | |
2600 set_req(MemNode::ValueIn, shl->in(1)); | |
2601 return this; | |
2602 } | |
2603 } | |
2604 } | |
2605 } | |
2606 return NULL; | |
2607 } | |
2608 | |
2609 //------------------------------value_never_loaded----------------------------------- | |
2610 // Determine whether there are any possible loads of the value stored. | |
2611 // For simplicity, we actually check if there are any loads from the | |
2612 // address stored to, not just for loads of the value stored by this node. | |
2613 // | |
2614 bool StoreNode::value_never_loaded( PhaseTransform *phase) const { | |
2615 Node *adr = in(Address); | |
2616 const TypeOopPtr *adr_oop = phase->type(adr)->isa_oopptr(); | |
2617 if (adr_oop == NULL) | |
2618 return false; | |
223 | 2619 if (!adr_oop->is_known_instance_field()) |
0 | 2620 return false; // if not a distinct instance, there may be aliases of the address |
2621 for (DUIterator_Fast imax, i = adr->fast_outs(imax); i < imax; i++) { | |
2622 Node *use = adr->fast_out(i); | |
2623 int opc = use->Opcode(); | |
2624 if (use->is_Load() || use->is_LoadStore()) { | |
2625 return false; | |
2626 } | |
2627 } | |
2628 return true; | |
2629 } | |
2630 | |
2631 //============================================================================= | |
2632 //------------------------------Ideal------------------------------------------ | |
2633 // If the store is from an AND mask that leaves the low bits untouched, then | |
2634 // we can skip the AND operation. If the store is from a sign-extension | |
2635 // (a left shift, then right shift) we can skip both. | |
2636 Node *StoreBNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2637 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFF); | |
2638 if( progress != NULL ) return progress; | |
2639 | |
2640 progress = StoreNode::Ideal_sign_extended_input(phase, 24); | |
2641 if( progress != NULL ) return progress; | |
2642 | |
2643 // Finally check the default case | |
2644 return StoreNode::Ideal(phase, can_reshape); | |
2645 } | |
2646 | |
2647 //============================================================================= | |
2648 //------------------------------Ideal------------------------------------------ | |
2649 // If the store is from an AND mask that leaves the low bits untouched, then | |
2650 // we can skip the AND operation | |
2651 Node *StoreCNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2652 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFFFF); | |
2653 if( progress != NULL ) return progress; | |
2654 | |
2655 progress = StoreNode::Ideal_sign_extended_input(phase, 16); | |
2656 if( progress != NULL ) return progress; | |
2657 | |
2658 // Finally check the default case | |
2659 return StoreNode::Ideal(phase, can_reshape); | |
2660 } | |
2661 | |
2662 //============================================================================= | |
2663 //------------------------------Identity--------------------------------------- | |
2664 Node *StoreCMNode::Identity( PhaseTransform *phase ) { | |
2665 // No need to card mark when storing a null ptr | |
2666 Node* my_store = in(MemNode::OopStore); | |
2667 if (my_store->is_Store()) { | |
2668 const Type *t1 = phase->type( my_store->in(MemNode::ValueIn) ); | |
2669 if( t1 == TypePtr::NULL_PTR ) { | |
2670 return in(MemNode::Memory); | |
2671 } | |
2672 } | |
2673 return this; | |
2674 } | |
2675 | |
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|
2676 //============================================================================= |
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6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
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|
2677 //------------------------------Ideal--------------------------------------- |
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6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
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diff
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|
2678 Node *StoreCMNode::Ideal(PhaseGVN *phase, bool can_reshape){ |
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6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
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|
2679 Node* progress = StoreNode::Ideal(phase, can_reshape); |
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6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
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|
2680 if (progress != NULL) return progress; |
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6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
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|
2681 |
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|
2682 Node* my_store = in(MemNode::OopStore); |
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6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
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diff
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|
2683 if (my_store->is_MergeMem()) { |
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6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
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diff
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|
2684 Node* mem = my_store->as_MergeMem()->memory_at(oop_alias_idx()); |
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|
2685 set_req(MemNode::OopStore, mem); |
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6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
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|
2686 return this; |
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diff
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|
2687 } |
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|
2688 |
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|
2689 return NULL; |
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|
2690 } |
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|
2691 |
0 | 2692 //------------------------------Value----------------------------------------- |
2693 const Type *StoreCMNode::Value( PhaseTransform *phase ) const { | |
43 | 2694 // Either input is TOP ==> the result is TOP |
2695 const Type *t = phase->type( in(MemNode::Memory) ); | |
2696 if( t == Type::TOP ) return Type::TOP; | |
2697 t = phase->type( in(MemNode::Address) ); | |
2698 if( t == Type::TOP ) return Type::TOP; | |
2699 t = phase->type( in(MemNode::ValueIn) ); | |
2700 if( t == Type::TOP ) return Type::TOP; | |
0 | 2701 // If extra input is TOP ==> the result is TOP |
43 | 2702 t = phase->type( in(MemNode::OopStore) ); |
2703 if( t == Type::TOP ) return Type::TOP; | |
0 | 2704 |
2705 return StoreNode::Value( phase ); | |
2706 } | |
2707 | |
2708 | |
2709 //============================================================================= | |
2710 //----------------------------------SCMemProjNode------------------------------ | |
2711 const Type * SCMemProjNode::Value( PhaseTransform *phase ) const | |
2712 { | |
2713 return bottom_type(); | |
2714 } | |
2715 | |
2716 //============================================================================= | |
6795
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7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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|
2717 //----------------------------------LoadStoreNode------------------------------ |
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|
2718 LoadStoreNode::LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at, const Type* rt, uint required ) |
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|
2719 : Node(required), |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2720 _type(rt), |
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7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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|
2721 _adr_type(at) |
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7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2722 { |
0 | 2723 init_req(MemNode::Control, c ); |
2724 init_req(MemNode::Memory , mem); | |
2725 init_req(MemNode::Address, adr); | |
2726 init_req(MemNode::ValueIn, val); | |
2727 init_class_id(Class_LoadStore); | |
6795
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2728 } |
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7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2729 |
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7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2730 uint LoadStoreNode::ideal_reg() const { |
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7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2731 return _type->ideal_reg(); |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2732 } |
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|
2733 |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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|
2734 bool LoadStoreNode::result_not_used() const { |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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6725
diff
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|
2735 for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) { |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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|
2736 Node *x = fast_out(i); |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2737 if (x->Opcode() == Op_SCMemProj) continue; |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
roland
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diff
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|
2738 return false; |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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6725
diff
changeset
|
2739 } |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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parents:
6725
diff
changeset
|
2740 return true; |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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parents:
6725
diff
changeset
|
2741 } |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2742 |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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6725
diff
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|
2743 uint LoadStoreNode::size_of() const { return sizeof(*this); } |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2744 |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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6725
diff
changeset
|
2745 //============================================================================= |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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diff
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|
2746 //----------------------------------LoadStoreConditionalNode-------------------- |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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parents:
6725
diff
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|
2747 LoadStoreConditionalNode::LoadStoreConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex ) : LoadStoreNode(c, mem, adr, val, NULL, TypeInt::BOOL, 5) { |
7eca5de9e0b6
7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
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6725
diff
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|
2748 init_req(ExpectedIn, ex ); |
0 | 2749 } |
2750 | |
2751 //============================================================================= | |
2752 //-------------------------------adr_type-------------------------------------- | |
2753 // Do we Match on this edge index or not? Do not match memory | |
2754 const TypePtr* ClearArrayNode::adr_type() const { | |
2755 Node *adr = in(3); | |
2756 return MemNode::calculate_adr_type(adr->bottom_type()); | |
2757 } | |
2758 | |
2759 //------------------------------match_edge------------------------------------- | |
2760 // Do we Match on this edge index or not? Do not match memory | |
2761 uint ClearArrayNode::match_edge(uint idx) const { | |
2762 return idx > 1; | |
2763 } | |
2764 | |
2765 //------------------------------Identity--------------------------------------- | |
2766 // Clearing a zero length array does nothing | |
2767 Node *ClearArrayNode::Identity( PhaseTransform *phase ) { | |
68
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6676841: ClearArrayNode::Identity is incorrect for 64-bit
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diff
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|
2768 return phase->type(in(2))->higher_equal(TypeX::ZERO) ? in(1) : this; |
0 | 2769 } |
2770 | |
2771 //------------------------------Idealize--------------------------------------- | |
2772 // Clearing a short array is faster with stores | |
2773 Node *ClearArrayNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2774 const int unit = BytesPerLong; | |
2775 const TypeX* t = phase->type(in(2))->isa_intptr_t(); | |
2776 if (!t) return NULL; | |
2777 if (!t->is_con()) return NULL; | |
2778 intptr_t raw_count = t->get_con(); | |
2779 intptr_t size = raw_count; | |
2780 if (!Matcher::init_array_count_is_in_bytes) size *= unit; | |
2781 // Clearing nothing uses the Identity call. | |
2782 // Negative clears are possible on dead ClearArrays | |
2783 // (see jck test stmt114.stmt11402.val). | |
2784 if (size <= 0 || size % unit != 0) return NULL; | |
2785 intptr_t count = size / unit; | |
2786 // Length too long; use fast hardware clear | |
2787 if (size > Matcher::init_array_short_size) return NULL; | |
2788 Node *mem = in(1); | |
2789 if( phase->type(mem)==Type::TOP ) return NULL; | |
2790 Node *adr = in(3); | |
2791 const Type* at = phase->type(adr); | |
2792 if( at==Type::TOP ) return NULL; | |
2793 const TypePtr* atp = at->isa_ptr(); | |
2794 // adjust atp to be the correct array element address type | |
2795 if (atp == NULL) atp = TypePtr::BOTTOM; | |
2796 else atp = atp->add_offset(Type::OffsetBot); | |
2797 // Get base for derived pointer purposes | |
2798 if( adr->Opcode() != Op_AddP ) Unimplemented(); | |
2799 Node *base = adr->in(1); | |
2800 | |
2801 Node *zero = phase->makecon(TypeLong::ZERO); | |
2802 Node *off = phase->MakeConX(BytesPerLong); | |
14429
2113136690bc
8024921: PPC64 (part 113): Extend Load and Store nodes to know about memory ordering
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12242
diff
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|
2803 mem = new (phase->C) StoreLNode(in(0),mem,adr,atp,zero,MemNode::unordered,false); |
0 | 2804 count--; |
2805 while( count-- ) { | |
2806 mem = phase->transform(mem); | |
6804
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7193318: C2: remove number of inputs requirement from Node's new operator
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|
2807 adr = phase->transform(new (phase->C) AddPNode(base,adr,off)); |
14429
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8024921: PPC64 (part 113): Extend Load and Store nodes to know about memory ordering
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diff
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|
2808 mem = new (phase->C) StoreLNode(in(0),mem,adr,atp,zero,MemNode::unordered,false); |
0 | 2809 } |
2810 return mem; | |
2811 } | |
2812 | |
1100
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6895383: JCK test throws NPE for method compiled with Escape Analysis
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parents:
1080
diff
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|
2813 //----------------------------step_through---------------------------------- |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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diff
changeset
|
2814 // Return allocation input memory edge if it is different instance |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
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diff
changeset
|
2815 // or itself if it is the one we are looking for. |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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1080
diff
changeset
|
2816 bool ClearArrayNode::step_through(Node** np, uint instance_id, PhaseTransform* phase) { |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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1080
diff
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|
2817 Node* n = *np; |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
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diff
changeset
|
2818 assert(n->is_ClearArray(), "sanity"); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2819 intptr_t offset; |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2820 AllocateNode* alloc = AllocateNode::Ideal_allocation(n->in(3), phase, offset); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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1080
diff
changeset
|
2821 // This method is called only before Allocate nodes are expanded during |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2822 // macro nodes expansion. Before that ClearArray nodes are only generated |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2823 // in LibraryCallKit::generate_arraycopy() which follows allocations. |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2824 assert(alloc != NULL, "should have allocation"); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2825 if (alloc->_idx == instance_id) { |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2826 // Can not bypass initialization of the instance we are looking for. |
f96a1a986f7b
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kvn
parents:
1080
diff
changeset
|
2827 return false; |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2828 } |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2829 // Otherwise skip it. |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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1080
diff
changeset
|
2830 InitializeNode* init = alloc->initialization(); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2831 if (init != NULL) |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2832 *np = init->in(TypeFunc::Memory); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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1080
diff
changeset
|
2833 else |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
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1080
diff
changeset
|
2834 *np = alloc->in(TypeFunc::Memory); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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1080
diff
changeset
|
2835 return true; |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2836 } |
f96a1a986f7b
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diff
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|
2837 |
0 | 2838 //----------------------------clear_memory------------------------------------- |
2839 // Generate code to initialize object storage to zero. | |
2840 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2841 intptr_t start_offset, | |
2842 Node* end_offset, | |
2843 PhaseGVN* phase) { | |
2844 Compile* C = phase->C; | |
2845 intptr_t offset = start_offset; | |
2846 | |
2847 int unit = BytesPerLong; | |
2848 if ((offset % unit) != 0) { | |
6804
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7193318: C2: remove number of inputs requirement from Node's new operator
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diff
changeset
|
2849 Node* adr = new (C) AddPNode(dest, dest, phase->MakeConX(offset)); |
0 | 2850 adr = phase->transform(adr); |
2851 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
14429
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12242
diff
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|
2852 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT, MemNode::unordered); |
0 | 2853 mem = phase->transform(mem); |
2854 offset += BytesPerInt; | |
2855 } | |
2856 assert((offset % unit) == 0, ""); | |
2857 | |
2858 // Initialize the remaining stuff, if any, with a ClearArray. | |
2859 return clear_memory(ctl, mem, dest, phase->MakeConX(offset), end_offset, phase); | |
2860 } | |
2861 | |
2862 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2863 Node* start_offset, | |
2864 Node* end_offset, | |
2865 PhaseGVN* phase) { | |
68
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64
diff
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|
2866 if (start_offset == end_offset) { |
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
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parents:
64
diff
changeset
|
2867 // nothing to do |
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
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parents:
64
diff
changeset
|
2868 return mem; |
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
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64
diff
changeset
|
2869 } |
daf38130e60d
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64
diff
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|
2870 |
0 | 2871 Compile* C = phase->C; |
2872 int unit = BytesPerLong; | |
2873 Node* zbase = start_offset; | |
2874 Node* zend = end_offset; | |
2875 | |
2876 // Scale to the unit required by the CPU: | |
2877 if (!Matcher::init_array_count_is_in_bytes) { | |
2878 Node* shift = phase->intcon(exact_log2(unit)); | |
6804
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changeset
|
2879 zbase = phase->transform( new(C) URShiftXNode(zbase, shift) ); |
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kvn
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changeset
|
2880 zend = phase->transform( new(C) URShiftXNode(zend, shift) ); |
0 | 2881 } |
2882 | |
7474
00af3a3a8df4
8005522: use fast-string instructions on x86 for zeroing
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6853
diff
changeset
|
2883 // Bulk clear double-words |
6804
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diff
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|
2884 Node* zsize = phase->transform( new(C) SubXNode(zend, zbase) ); |
e626685e9f6c
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|
2885 Node* adr = phase->transform( new(C) AddPNode(dest, dest, start_offset) ); |
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|
2886 mem = new (C) ClearArrayNode(ctl, mem, zsize, adr); |
0 | 2887 return phase->transform(mem); |
2888 } | |
2889 | |
2890 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2891 intptr_t start_offset, | |
2892 intptr_t end_offset, | |
2893 PhaseGVN* phase) { | |
68
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64
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|
2894 if (start_offset == end_offset) { |
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
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parents:
64
diff
changeset
|
2895 // nothing to do |
daf38130e60d
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parents:
64
diff
changeset
|
2896 return mem; |
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
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64
diff
changeset
|
2897 } |
daf38130e60d
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64
diff
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|
2898 |
0 | 2899 Compile* C = phase->C; |
2900 assert((end_offset % BytesPerInt) == 0, "odd end offset"); | |
2901 intptr_t done_offset = end_offset; | |
2902 if ((done_offset % BytesPerLong) != 0) { | |
2903 done_offset -= BytesPerInt; | |
2904 } | |
2905 if (done_offset > start_offset) { | |
2906 mem = clear_memory(ctl, mem, dest, | |
2907 start_offset, phase->MakeConX(done_offset), phase); | |
2908 } | |
2909 if (done_offset < end_offset) { // emit the final 32-bit store | |
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2910 Node* adr = new (C) AddPNode(dest, dest, phase->MakeConX(done_offset)); |
0 | 2911 adr = phase->transform(adr); |
2912 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2913 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT, MemNode::unordered); |
0 | 2914 mem = phase->transform(mem); |
2915 done_offset += BytesPerInt; | |
2916 } | |
2917 assert(done_offset == end_offset, ""); | |
2918 return mem; | |
2919 } | |
2920 | |
2921 //============================================================================= | |
2412
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|
2922 // Do not match memory edge. |
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|
2923 uint StrIntrinsicNode::match_edge(uint idx) const { |
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7029152: Ideal nodes for String intrinsics miss memory edge optimization
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|
2924 return idx == 2 || idx == 3; |
681 | 2925 } |
2926 | |
2927 //------------------------------Ideal------------------------------------------ | |
2928 // Return a node which is more "ideal" than the current node. Strip out | |
2929 // control copies | |
2412
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2930 Node *StrIntrinsicNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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2931 if (remove_dead_region(phase, can_reshape)) return this; |
4115 | 2932 // Don't bother trying to transform a dead node |
2933 if (in(0) && in(0)->is_top()) return NULL; | |
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2934 |
2417 | 2935 if (can_reshape) { |
2936 Node* mem = phase->transform(in(MemNode::Memory)); | |
2937 // If transformed to a MergeMem, get the desired slice | |
2938 uint alias_idx = phase->C->get_alias_index(adr_type()); | |
2939 mem = mem->is_MergeMem() ? mem->as_MergeMem()->memory_at(alias_idx) : mem; | |
2940 if (mem != in(MemNode::Memory)) { | |
2941 set_req(MemNode::Memory, mem); | |
2942 return this; | |
2943 } | |
2944 } | |
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|
2945 return NULL; |
169
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6695049: (coll) Create an x86 intrinsic for Arrays.equals
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|
2946 } |
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2947 |
4115 | 2948 //------------------------------Value------------------------------------------ |
2949 const Type *StrIntrinsicNode::Value( PhaseTransform *phase ) const { | |
2950 if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP; | |
2951 return bottom_type(); | |
2952 } | |
2953 | |
0 | 2954 //============================================================================= |
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2955 //------------------------------match_edge------------------------------------- |
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2956 // Do not match memory edge |
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2957 uint EncodeISOArrayNode::match_edge(uint idx) const { |
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2958 return idx == 2 || idx == 3; // EncodeISOArray src (Binary dst len) |
b30b3c2a0cf2
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|
2959 } |
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2960 |
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2961 //------------------------------Ideal------------------------------------------ |
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2962 // Return a node which is more "ideal" than the current node. Strip out |
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2963 // control copies |
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2964 Node *EncodeISOArrayNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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2965 return remove_dead_region(phase, can_reshape) ? this : NULL; |
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2966 } |
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2967 |
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2968 //------------------------------Value------------------------------------------ |
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2969 const Type *EncodeISOArrayNode::Value(PhaseTransform *phase) const { |
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2970 if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP; |
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2971 return bottom_type(); |
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|
2972 } |
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|
2973 |
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|
2974 //============================================================================= |
0 | 2975 MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent) |
2976 : MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)), | |
2977 _adr_type(C->get_adr_type(alias_idx)) | |
2978 { | |
2979 init_class_id(Class_MemBar); | |
2980 Node* top = C->top(); | |
2981 init_req(TypeFunc::I_O,top); | |
2982 init_req(TypeFunc::FramePtr,top); | |
2983 init_req(TypeFunc::ReturnAdr,top); | |
2984 if (precedent != NULL) | |
2985 init_req(TypeFunc::Parms, precedent); | |
2986 } | |
2987 | |
2988 //------------------------------cmp-------------------------------------------- | |
2989 uint MemBarNode::hash() const { return NO_HASH; } | |
2990 uint MemBarNode::cmp( const Node &n ) const { | |
2991 return (&n == this); // Always fail except on self | |
2992 } | |
2993 | |
2994 //------------------------------make------------------------------------------- | |
2995 MemBarNode* MemBarNode::make(Compile* C, int opcode, int atp, Node* pn) { | |
2996 switch (opcode) { | |
14439
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8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
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2997 case Op_MemBarAcquire: return new(C) MemBarAcquireNode(C, atp, pn); |
50fdb38839eb
8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
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2998 case Op_LoadFence: return new(C) LoadFenceNode(C, atp, pn); |
50fdb38839eb
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2999 case Op_MemBarRelease: return new(C) MemBarReleaseNode(C, atp, pn); |
50fdb38839eb
8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
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3000 case Op_StoreFence: return new(C) StoreFenceNode(C, atp, pn); |
50fdb38839eb
8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
goetz
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3001 case Op_MemBarAcquireLock: return new(C) MemBarAcquireLockNode(C, atp, pn); |
50fdb38839eb
8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
goetz
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|
3002 case Op_MemBarReleaseLock: return new(C) MemBarReleaseLockNode(C, atp, pn); |
50fdb38839eb
8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
goetz
parents:
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diff
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|
3003 case Op_MemBarVolatile: return new(C) MemBarVolatileNode(C, atp, pn); |
50fdb38839eb
8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
goetz
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diff
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|
3004 case Op_MemBarCPUOrder: return new(C) MemBarCPUOrderNode(C, atp, pn); |
50fdb38839eb
8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
goetz
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|
3005 case Op_Initialize: return new(C) InitializeNode(C, atp, pn); |
50fdb38839eb
8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
goetz
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|
3006 case Op_MemBarStoreStore: return new(C) MemBarStoreStoreNode(C, atp, pn); |
50fdb38839eb
8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence.
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diff
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|
3007 default: ShouldNotReachHere(); return NULL; |
0 | 3008 } |
3009 } | |
3010 | |
3011 //------------------------------Ideal------------------------------------------ | |
3012 // Return a node which is more "ideal" than the current node. Strip out | |
3013 // control copies | |
3014 Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1100
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|
3015 if (remove_dead_region(phase, can_reshape)) return this; |
4115 | 3016 // Don't bother trying to transform a dead node |
11005
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
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|
3017 if (in(0) && in(0)->is_top()) { |
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
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10278
diff
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|
3018 return NULL; |
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
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10278
diff
changeset
|
3019 } |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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diff
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|
3020 |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
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|
3021 // Eliminate volatile MemBars for scalar replaced objects. |
10278 | 3022 if (can_reshape && req() == (Precedent+1)) { |
3023 bool eliminate = false; | |
3024 int opc = Opcode(); | |
3025 if ((opc == Op_MemBarAcquire || opc == Op_MemBarVolatile)) { | |
3026 // Volatile field loads and stores. | |
3027 Node* my_mem = in(MemBarNode::Precedent); | |
11005
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
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changeset
|
3028 // The MembarAquire may keep an unused LoadNode alive through the Precedent edge |
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
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10278
diff
changeset
|
3029 if ((my_mem != NULL) && (opc == Op_MemBarAcquire) && (my_mem->outcnt() == 1)) { |
11044 | 3030 // if the Precedent is a decodeN and its input (a Load) is used at more than one place, |
3031 // replace this Precedent (decodeN) with the Load instead. | |
3032 if ((my_mem->Opcode() == Op_DecodeN) && (my_mem->in(1)->outcnt() > 1)) { | |
3033 Node* load_node = my_mem->in(1); | |
3034 set_req(MemBarNode::Precedent, load_node); | |
3035 phase->is_IterGVN()->_worklist.push(my_mem); | |
3036 my_mem = load_node; | |
3037 } else { | |
3038 assert(my_mem->unique_out() == this, "sanity"); | |
3039 del_req(Precedent); | |
3040 phase->is_IterGVN()->_worklist.push(my_mem); // remove dead node later | |
3041 my_mem = NULL; | |
3042 } | |
11005
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
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10278
diff
changeset
|
3043 } |
10278 | 3044 if (my_mem != NULL && my_mem->is_Mem()) { |
3045 const TypeOopPtr* t_oop = my_mem->in(MemNode::Address)->bottom_type()->isa_oopptr(); | |
3046 // Check for scalar replaced object reference. | |
3047 if( t_oop != NULL && t_oop->is_known_instance_field() && | |
3048 t_oop->offset() != Type::OffsetBot && | |
3049 t_oop->offset() != Type::OffsetTop) { | |
3050 eliminate = true; | |
3051 } | |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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diff
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|
3052 } |
10278 | 3053 } else if (opc == Op_MemBarRelease) { |
3054 // Final field stores. | |
3055 Node* alloc = AllocateNode::Ideal_allocation(in(MemBarNode::Precedent), phase); | |
3056 if ((alloc != NULL) && alloc->is_Allocate() && | |
3057 alloc->as_Allocate()->_is_non_escaping) { | |
3058 // The allocated object does not escape. | |
3059 eliminate = true; | |
3060 } | |
3061 } | |
3062 if (eliminate) { | |
3063 // Replace MemBar projections by its inputs. | |
3064 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
3065 igvn->replace_node(proj_out(TypeFunc::Memory), in(TypeFunc::Memory)); | |
3066 igvn->replace_node(proj_out(TypeFunc::Control), in(TypeFunc::Control)); | |
3067 // Must return either the original node (now dead) or a new node | |
3068 // (Do not return a top here, since that would break the uniqueness of top.) | |
3069 return new (phase->C) ConINode(TypeInt::ZERO); | |
1100
f96a1a986f7b
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kvn
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|
3070 } |
f96a1a986f7b
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diff
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|
3071 } |
f96a1a986f7b
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diff
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|
3072 return NULL; |
0 | 3073 } |
3074 | |
3075 //------------------------------Value------------------------------------------ | |
3076 const Type *MemBarNode::Value( PhaseTransform *phase ) const { | |
3077 if( !in(0) ) return Type::TOP; | |
3078 if( phase->type(in(0)) == Type::TOP ) | |
3079 return Type::TOP; | |
3080 return TypeTuple::MEMBAR; | |
3081 } | |
3082 | |
3083 //------------------------------match------------------------------------------ | |
3084 // Construct projections for memory. | |
3085 Node *MemBarNode::match( const ProjNode *proj, const Matcher *m ) { | |
3086 switch (proj->_con) { | |
3087 case TypeFunc::Control: | |
3088 case TypeFunc::Memory: | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
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6795
diff
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|
3089 return new (m->C) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); |
0 | 3090 } |
3091 ShouldNotReachHere(); | |
3092 return NULL; | |
3093 } | |
3094 | |
3095 //===========================InitializeNode==================================== | |
3096 // SUMMARY: | |
3097 // This node acts as a memory barrier on raw memory, after some raw stores. | |
3098 // The 'cooked' oop value feeds from the Initialize, not the Allocation. | |
3099 // The Initialize can 'capture' suitably constrained stores as raw inits. | |
3100 // It can coalesce related raw stores into larger units (called 'tiles'). | |
3101 // It can avoid zeroing new storage for memory units which have raw inits. | |
3102 // At macro-expansion, it is marked 'complete', and does not optimize further. | |
3103 // | |
3104 // EXAMPLE: | |
3105 // The object 'new short[2]' occupies 16 bytes in a 32-bit machine. | |
3106 // ctl = incoming control; mem* = incoming memory | |
3107 // (Note: A star * on a memory edge denotes I/O and other standard edges.) | |
3108 // First allocate uninitialized memory and fill in the header: | |
3109 // alloc = (Allocate ctl mem* 16 #short[].klass ...) | |
3110 // ctl := alloc.Control; mem* := alloc.Memory* | |
3111 // rawmem = alloc.Memory; rawoop = alloc.RawAddress | |
3112 // Then initialize to zero the non-header parts of the raw memory block: | |
3113 // init = (Initialize alloc.Control alloc.Memory* alloc.RawAddress) | |
3114 // ctl := init.Control; mem.SLICE(#short[*]) := init.Memory | |
3115 // After the initialize node executes, the object is ready for service: | |
3116 // oop := (CheckCastPP init.Control alloc.RawAddress #short[]) | |
3117 // Suppose its body is immediately initialized as {1,2}: | |
3118 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
3119 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
3120 // mem.SLICE(#short[*]) := store2 | |
3121 // | |
3122 // DETAILS: | |
3123 // An InitializeNode collects and isolates object initialization after | |
3124 // an AllocateNode and before the next possible safepoint. As a | |
3125 // memory barrier (MemBarNode), it keeps critical stores from drifting | |
3126 // down past any safepoint or any publication of the allocation. | |
3127 // Before this barrier, a newly-allocated object may have uninitialized bits. | |
3128 // After this barrier, it may be treated as a real oop, and GC is allowed. | |
3129 // | |
3130 // The semantics of the InitializeNode include an implicit zeroing of | |
3131 // the new object from object header to the end of the object. | |
3132 // (The object header and end are determined by the AllocateNode.) | |
3133 // | |
3134 // Certain stores may be added as direct inputs to the InitializeNode. | |
3135 // These stores must update raw memory, and they must be to addresses | |
3136 // derived from the raw address produced by AllocateNode, and with | |
3137 // a constant offset. They must be ordered by increasing offset. | |
3138 // The first one is at in(RawStores), the last at in(req()-1). | |
3139 // Unlike most memory operations, they are not linked in a chain, | |
3140 // but are displayed in parallel as users of the rawmem output of | |
3141 // the allocation. | |
3142 // | |
3143 // (See comments in InitializeNode::capture_store, which continue | |
3144 // the example given above.) | |
3145 // | |
3146 // When the associated Allocate is macro-expanded, the InitializeNode | |
3147 // may be rewritten to optimize collected stores. A ClearArrayNode | |
3148 // may also be created at that point to represent any required zeroing. | |
3149 // The InitializeNode is then marked 'complete', prohibiting further | |
3150 // capturing of nearby memory operations. | |
3151 // | |
3152 // During macro-expansion, all captured initializations which store | |
605 | 3153 // constant values of 32 bits or smaller are coalesced (if advantageous) |
0 | 3154 // into larger 'tiles' 32 or 64 bits. This allows an object to be |
3155 // initialized in fewer memory operations. Memory words which are | |
3156 // covered by neither tiles nor non-constant stores are pre-zeroed | |
3157 // by explicit stores of zero. (The code shape happens to do all | |
3158 // zeroing first, then all other stores, with both sequences occurring | |
3159 // in order of ascending offsets.) | |
3160 // | |
3161 // Alternatively, code may be inserted between an AllocateNode and its | |
3162 // InitializeNode, to perform arbitrary initialization of the new object. | |
3163 // E.g., the object copying intrinsics insert complex data transfers here. | |
3164 // The initialization must then be marked as 'complete' disable the | |
3165 // built-in zeroing semantics and the collection of initializing stores. | |
3166 // | |
3167 // While an InitializeNode is incomplete, reads from the memory state | |
3168 // produced by it are optimizable if they match the control edge and | |
3169 // new oop address associated with the allocation/initialization. | |
3170 // They return a stored value (if the offset matches) or else zero. | |
3171 // A write to the memory state, if it matches control and address, | |
3172 // and if it is to a constant offset, may be 'captured' by the | |
3173 // InitializeNode. It is cloned as a raw memory operation and rewired | |
3174 // inside the initialization, to the raw oop produced by the allocation. | |
3175 // Operations on addresses which are provably distinct (e.g., to | |
3176 // other AllocateNodes) are allowed to bypass the initialization. | |
3177 // | |
3178 // The effect of all this is to consolidate object initialization | |
3179 // (both arrays and non-arrays, both piecewise and bulk) into a | |
3180 // single location, where it can be optimized as a unit. | |
3181 // | |
3182 // Only stores with an offset less than TrackedInitializationLimit words | |
3183 // will be considered for capture by an InitializeNode. This puts a | |
3184 // reasonable limit on the complexity of optimized initializations. | |
3185 | |
3186 //---------------------------InitializeNode------------------------------------ | |
3187 InitializeNode::InitializeNode(Compile* C, int adr_type, Node* rawoop) | |
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|
3188 : _is_complete(Incomplete), _does_not_escape(false), |
0 | 3189 MemBarNode(C, adr_type, rawoop) |
3190 { | |
3191 init_class_id(Class_Initialize); | |
3192 | |
3193 assert(adr_type == Compile::AliasIdxRaw, "only valid atp"); | |
3194 assert(in(RawAddress) == rawoop, "proper init"); | |
3195 // Note: allocation() can be NULL, for secondary initialization barriers | |
3196 } | |
3197 | |
3198 // Since this node is not matched, it will be processed by the | |
3199 // register allocator. Declare that there are no constraints | |
3200 // on the allocation of the RawAddress edge. | |
3201 const RegMask &InitializeNode::in_RegMask(uint idx) const { | |
3202 // This edge should be set to top, by the set_complete. But be conservative. | |
3203 if (idx == InitializeNode::RawAddress) | |
3204 return *(Compile::current()->matcher()->idealreg2spillmask[in(idx)->ideal_reg()]); | |
3205 return RegMask::Empty; | |
3206 } | |
3207 | |
3208 Node* InitializeNode::memory(uint alias_idx) { | |
3209 Node* mem = in(Memory); | |
3210 if (mem->is_MergeMem()) { | |
3211 return mem->as_MergeMem()->memory_at(alias_idx); | |
3212 } else { | |
3213 // incoming raw memory is not split | |
3214 return mem; | |
3215 } | |
3216 } | |
3217 | |
3218 bool InitializeNode::is_non_zero() { | |
3219 if (is_complete()) return false; | |
3220 remove_extra_zeroes(); | |
3221 return (req() > RawStores); | |
3222 } | |
3223 | |
3224 void InitializeNode::set_complete(PhaseGVN* phase) { | |
3225 assert(!is_complete(), "caller responsibility"); | |
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7081933: Use zeroing elimination optimization for large array
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3226 _is_complete = Complete; |
0 | 3227 |
3228 // After this node is complete, it contains a bunch of | |
3229 // raw-memory initializations. There is no need for | |
3230 // it to have anything to do with non-raw memory effects. | |
3231 // Therefore, tell all non-raw users to re-optimize themselves, | |
3232 // after skipping the memory effects of this initialization. | |
3233 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
3234 if (igvn) igvn->add_users_to_worklist(this); | |
3235 } | |
3236 | |
3237 // convenience function | |
3238 // return false if the init contains any stores already | |
3239 bool AllocateNode::maybe_set_complete(PhaseGVN* phase) { | |
3240 InitializeNode* init = initialization(); | |
3241 if (init == NULL || init->is_complete()) return false; | |
3242 init->remove_extra_zeroes(); | |
3243 // for now, if this allocation has already collected any inits, bail: | |
3244 if (init->is_non_zero()) return false; | |
3245 init->set_complete(phase); | |
3246 return true; | |
3247 } | |
3248 | |
3249 void InitializeNode::remove_extra_zeroes() { | |
3250 if (req() == RawStores) return; | |
3251 Node* zmem = zero_memory(); | |
3252 uint fill = RawStores; | |
3253 for (uint i = fill; i < req(); i++) { | |
3254 Node* n = in(i); | |
3255 if (n->is_top() || n == zmem) continue; // skip | |
3256 if (fill < i) set_req(fill, n); // compact | |
3257 ++fill; | |
3258 } | |
3259 // delete any empty spaces created: | |
3260 while (fill < req()) { | |
3261 del_req(fill); | |
3262 } | |
3263 } | |
3264 | |
3265 // Helper for remembering which stores go with which offsets. | |
3266 intptr_t InitializeNode::get_store_offset(Node* st, PhaseTransform* phase) { | |
3267 if (!st->is_Store()) return -1; // can happen to dead code via subsume_node | |
3268 intptr_t offset = -1; | |
3269 Node* base = AddPNode::Ideal_base_and_offset(st->in(MemNode::Address), | |
3270 phase, offset); | |
3271 if (base == NULL) return -1; // something is dead, | |
3272 if (offset < 0) return -1; // dead, dead | |
3273 return offset; | |
3274 } | |
3275 | |
3276 // Helper for proving that an initialization expression is | |
3277 // "simple enough" to be folded into an object initialization. | |
3278 // Attempts to prove that a store's initial value 'n' can be captured | |
3279 // within the initialization without creating a vicious cycle, such as: | |
3280 // { Foo p = new Foo(); p.next = p; } | |
3281 // True for constants and parameters and small combinations thereof. | |
10278 | 3282 bool InitializeNode::detect_init_independence(Node* n, int& count) { |
0 | 3283 if (n == NULL) return true; // (can this really happen?) |
3284 if (n->is_Proj()) n = n->in(0); | |
3285 if (n == this) return false; // found a cycle | |
3286 if (n->is_Con()) return true; | |
3287 if (n->is_Start()) return true; // params, etc., are OK | |
3288 if (n->is_Root()) return true; // even better | |
3289 | |
3290 Node* ctl = n->in(0); | |
3291 if (ctl != NULL && !ctl->is_top()) { | |
3292 if (ctl->is_Proj()) ctl = ctl->in(0); | |
3293 if (ctl == this) return false; | |
3294 | |
3295 // If we already know that the enclosing memory op is pinned right after | |
3296 // the init, then any control flow that the store has picked up | |
3297 // must have preceded the init, or else be equal to the init. | |
3298 // Even after loop optimizations (which might change control edges) | |
3299 // a store is never pinned *before* the availability of its inputs. | |
119
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6686791: Side effect in NumberFormat tests with -server -Xcomp
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3300 if (!MemNode::all_controls_dominate(n, this)) |
0 | 3301 return false; // failed to prove a good control |
3302 } | |
3303 | |
3304 // Check data edges for possible dependencies on 'this'. | |
3305 if ((count += 1) > 20) return false; // complexity limit | |
3306 for (uint i = 1; i < n->req(); i++) { | |
3307 Node* m = n->in(i); | |
3308 if (m == NULL || m == n || m->is_top()) continue; | |
3309 uint first_i = n->find_edge(m); | |
3310 if (i != first_i) continue; // process duplicate edge just once | |
10278 | 3311 if (!detect_init_independence(m, count)) { |
0 | 3312 return false; |
3313 } | |
3314 } | |
3315 | |
3316 return true; | |
3317 } | |
3318 | |
3319 // Here are all the checks a Store must pass before it can be moved into | |
3320 // an initialization. Returns zero if a check fails. | |
3321 // On success, returns the (constant) offset to which the store applies, | |
3322 // within the initialized memory. | |
8116
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3323 intptr_t InitializeNode::can_capture_store(StoreNode* st, PhaseTransform* phase, bool can_reshape) { |
0 | 3324 const int FAIL = 0; |
3325 if (st->req() != MemNode::ValueIn + 1) | |
3326 return FAIL; // an inscrutable StoreNode (card mark?) | |
3327 Node* ctl = st->in(MemNode::Control); | |
3328 if (!(ctl != NULL && ctl->is_Proj() && ctl->in(0) == this)) | |
3329 return FAIL; // must be unconditional after the initialization | |
3330 Node* mem = st->in(MemNode::Memory); | |
3331 if (!(mem->is_Proj() && mem->in(0) == this)) | |
3332 return FAIL; // must not be preceded by other stores | |
3333 Node* adr = st->in(MemNode::Address); | |
3334 intptr_t offset; | |
3335 AllocateNode* alloc = AllocateNode::Ideal_allocation(adr, phase, offset); | |
3336 if (alloc == NULL) | |
3337 return FAIL; // inscrutable address | |
3338 if (alloc != allocation()) | |
3339 return FAIL; // wrong allocation! (store needs to float up) | |
3340 Node* val = st->in(MemNode::ValueIn); | |
3341 int complexity_count = 0; | |
10278 | 3342 if (!detect_init_independence(val, complexity_count)) |
0 | 3343 return FAIL; // stored value must be 'simple enough' |
3344 | |
8116
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3345 // The Store can be captured only if nothing after the allocation |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3346 // and before the Store is using the memory location that the store |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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diff
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|
3347 // overwrites. |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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changeset
|
3348 bool failed = false; |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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diff
changeset
|
3349 // If is_complete_with_arraycopy() is true the shape of the graph is |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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diff
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|
3350 // well defined and is safe so no need for extra checks. |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3351 if (!is_complete_with_arraycopy()) { |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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diff
changeset
|
3352 // We are going to look at each use of the memory state following |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3353 // the allocation to make sure nothing reads the memory that the |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3354 // Store writes. |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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diff
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|
3355 const TypePtr* t_adr = phase->type(adr)->isa_ptr(); |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3356 int alias_idx = phase->C->get_alias_index(t_adr); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3357 ResourceMark rm; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
changeset
|
3358 Unique_Node_List mems; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3359 mems.push(mem); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3360 Node* unique_merge = NULL; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3361 for (uint next = 0; next < mems.size(); ++next) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3362 Node *m = mems.at(next); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3363 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
changeset
|
3364 Node *n = m->fast_out(j); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3365 if (n->outcnt() == 0) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3366 continue; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3367 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
changeset
|
3368 if (n == st) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3369 continue; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3370 } else if (n->in(0) != NULL && n->in(0) != ctl) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3371 // If the control of this use is different from the control |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3372 // of the Store which is right after the InitializeNode then |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3373 // this node cannot be between the InitializeNode and the |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3374 // Store. |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3375 continue; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3376 } else if (n->is_MergeMem()) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3377 if (n->as_MergeMem()->memory_at(alias_idx) == m) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3378 // We can hit a MergeMemNode (that will likely go away |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3379 // later) that is a direct use of the memory state |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3380 // following the InitializeNode on the same slice as the |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3381 // store node that we'd like to capture. We need to check |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3382 // the uses of the MergeMemNode. |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3383 mems.push(n); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3384 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3385 } else if (n->is_Mem()) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3386 Node* other_adr = n->in(MemNode::Address); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3387 if (other_adr == adr) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3388 failed = true; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3389 break; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3390 } else { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3391 const TypePtr* other_t_adr = phase->type(other_adr)->isa_ptr(); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3392 if (other_t_adr != NULL) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3393 int other_alias_idx = phase->C->get_alias_index(other_t_adr); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3394 if (other_alias_idx == alias_idx) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3395 // A load from the same memory slice as the store right |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3396 // after the InitializeNode. We check the control of the |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3397 // object/array that is loaded from. If it's the same as |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3398 // the store control then we cannot capture the store. |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3399 assert(!n->is_Store(), "2 stores to same slice on same control?"); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3400 Node* base = other_adr; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3401 assert(base->is_AddP(), err_msg_res("should be addp but is %s", base->Name())); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3402 base = base->in(AddPNode::Base); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3403 if (base != NULL) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3404 base = base->uncast(); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3405 if (base->is_Proj() && base->in(0) == alloc) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3406 failed = true; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3407 break; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3408 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3409 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3410 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3411 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3412 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3413 } else { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3414 failed = true; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3415 break; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3416 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3417 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3418 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3419 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3420 if (failed) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3421 if (!can_reshape) { |
6931f425c517
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3422 // We decided we couldn't capture the store during parsing. We |
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3423 // should try again during the next IGVN once the graph is |
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3424 // cleaner. |
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3425 phase->C->record_for_igvn(st); |
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3426 } |
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3427 return FAIL; |
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3428 } |
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3429 |
0 | 3430 return offset; // success |
3431 } | |
3432 | |
3433 // Find the captured store in(i) which corresponds to the range | |
3434 // [start..start+size) in the initialized object. | |
3435 // If there is one, return its index i. If there isn't, return the | |
3436 // negative of the index where it should be inserted. | |
3437 // Return 0 if the queried range overlaps an initialization boundary | |
3438 // or if dead code is encountered. | |
3439 // If size_in_bytes is zero, do not bother with overlap checks. | |
3440 int InitializeNode::captured_store_insertion_point(intptr_t start, | |
3441 int size_in_bytes, | |
3442 PhaseTransform* phase) { | |
3443 const int FAIL = 0, MAX_STORE = BytesPerLong; | |
3444 | |
3445 if (is_complete()) | |
3446 return FAIL; // arraycopy got here first; punt | |
3447 | |
3448 assert(allocation() != NULL, "must be present"); | |
3449 | |
3450 // no negatives, no header fields: | |
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3451 if (start < (intptr_t) allocation()->minimum_header_size()) return FAIL; |
0 | 3452 |
3453 // after a certain size, we bail out on tracking all the stores: | |
3454 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
3455 if (start >= ti_limit) return FAIL; | |
3456 | |
3457 for (uint i = InitializeNode::RawStores, limit = req(); ; ) { | |
3458 if (i >= limit) return -(int)i; // not found; here is where to put it | |
3459 | |
3460 Node* st = in(i); | |
3461 intptr_t st_off = get_store_offset(st, phase); | |
3462 if (st_off < 0) { | |
3463 if (st != zero_memory()) { | |
3464 return FAIL; // bail out if there is dead garbage | |
3465 } | |
3466 } else if (st_off > start) { | |
3467 // ...we are done, since stores are ordered | |
3468 if (st_off < start + size_in_bytes) { | |
3469 return FAIL; // the next store overlaps | |
3470 } | |
3471 return -(int)i; // not found; here is where to put it | |
3472 } else if (st_off < start) { | |
3473 if (size_in_bytes != 0 && | |
3474 start < st_off + MAX_STORE && | |
3475 start < st_off + st->as_Store()->memory_size()) { | |
3476 return FAIL; // the previous store overlaps | |
3477 } | |
3478 } else { | |
3479 if (size_in_bytes != 0 && | |
3480 st->as_Store()->memory_size() != size_in_bytes) { | |
3481 return FAIL; // mismatched store size | |
3482 } | |
3483 return i; | |
3484 } | |
3485 | |
3486 ++i; | |
3487 } | |
3488 } | |
3489 | |
3490 // Look for a captured store which initializes at the offset 'start' | |
3491 // with the given size. If there is no such store, and no other | |
3492 // initialization interferes, then return zero_memory (the memory | |
3493 // projection of the AllocateNode). | |
3494 Node* InitializeNode::find_captured_store(intptr_t start, int size_in_bytes, | |
3495 PhaseTransform* phase) { | |
3496 assert(stores_are_sane(phase), ""); | |
3497 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
3498 if (i == 0) { | |
3499 return NULL; // something is dead | |
3500 } else if (i < 0) { | |
3501 return zero_memory(); // just primordial zero bits here | |
3502 } else { | |
3503 Node* st = in(i); // here is the store at this position | |
3504 assert(get_store_offset(st->as_Store(), phase) == start, "sanity"); | |
3505 return st; | |
3506 } | |
3507 } | |
3508 | |
3509 // Create, as a raw pointer, an address within my new object at 'offset'. | |
3510 Node* InitializeNode::make_raw_address(intptr_t offset, | |
3511 PhaseTransform* phase) { | |
3512 Node* addr = in(RawAddress); | |
3513 if (offset != 0) { | |
3514 Compile* C = phase->C; | |
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3515 addr = phase->transform( new (C) AddPNode(C->top(), addr, |
0 | 3516 phase->MakeConX(offset)) ); |
3517 } | |
3518 return addr; | |
3519 } | |
3520 | |
3521 // Clone the given store, converting it into a raw store | |
3522 // initializing a field or element of my new object. | |
3523 // Caller is responsible for retiring the original store, | |
3524 // with subsume_node or the like. | |
3525 // | |
3526 // From the example above InitializeNode::InitializeNode, | |
3527 // here are the old stores to be captured: | |
3528 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
3529 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
3530 // | |
3531 // Here is the changed code; note the extra edges on init: | |
3532 // alloc = (Allocate ...) | |
3533 // rawoop = alloc.RawAddress | |
3534 // rawstore1 = (StoreC alloc.Control alloc.Memory (+ rawoop 12) 1) | |
3535 // rawstore2 = (StoreC alloc.Control alloc.Memory (+ rawoop 14) 2) | |
3536 // init = (Initialize alloc.Control alloc.Memory rawoop | |
3537 // rawstore1 rawstore2) | |
3538 // | |
3539 Node* InitializeNode::capture_store(StoreNode* st, intptr_t start, | |
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3540 PhaseTransform* phase, bool can_reshape) { |
0 | 3541 assert(stores_are_sane(phase), ""); |
3542 | |
3543 if (start < 0) return NULL; | |
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3544 assert(can_capture_store(st, phase, can_reshape) == start, "sanity"); |
0 | 3545 |
3546 Compile* C = phase->C; | |
3547 int size_in_bytes = st->memory_size(); | |
3548 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
3549 if (i == 0) return NULL; // bail out | |
3550 Node* prev_mem = NULL; // raw memory for the captured store | |
3551 if (i > 0) { | |
3552 prev_mem = in(i); // there is a pre-existing store under this one | |
3553 set_req(i, C->top()); // temporarily disconnect it | |
3554 // See StoreNode::Ideal 'st->outcnt() == 1' for the reason to disconnect. | |
3555 } else { | |
3556 i = -i; // no pre-existing store | |
3557 prev_mem = zero_memory(); // a slice of the newly allocated object | |
3558 if (i > InitializeNode::RawStores && in(i-1) == prev_mem) | |
3559 set_req(--i, C->top()); // reuse this edge; it has been folded away | |
3560 else | |
3561 ins_req(i, C->top()); // build a new edge | |
3562 } | |
3563 Node* new_st = st->clone(); | |
3564 new_st->set_req(MemNode::Control, in(Control)); | |
3565 new_st->set_req(MemNode::Memory, prev_mem); | |
3566 new_st->set_req(MemNode::Address, make_raw_address(start, phase)); | |
3567 new_st = phase->transform(new_st); | |
3568 | |
3569 // At this point, new_st might have swallowed a pre-existing store | |
3570 // at the same offset, or perhaps new_st might have disappeared, | |
3571 // if it redundantly stored the same value (or zero to fresh memory). | |
3572 | |
3573 // In any case, wire it in: | |
3574 set_req(i, new_st); | |
3575 | |
3576 // The caller may now kill the old guy. | |
3577 DEBUG_ONLY(Node* check_st = find_captured_store(start, size_in_bytes, phase)); | |
3578 assert(check_st == new_st || check_st == NULL, "must be findable"); | |
3579 assert(!is_complete(), ""); | |
3580 return new_st; | |
3581 } | |
3582 | |
3583 static bool store_constant(jlong* tiles, int num_tiles, | |
3584 intptr_t st_off, int st_size, | |
3585 jlong con) { | |
3586 if ((st_off & (st_size-1)) != 0) | |
3587 return false; // strange store offset (assume size==2**N) | |
3588 address addr = (address)tiles + st_off; | |
3589 assert(st_off >= 0 && addr+st_size <= (address)&tiles[num_tiles], "oob"); | |
3590 switch (st_size) { | |
3591 case sizeof(jbyte): *(jbyte*) addr = (jbyte) con; break; | |
3592 case sizeof(jchar): *(jchar*) addr = (jchar) con; break; | |
3593 case sizeof(jint): *(jint*) addr = (jint) con; break; | |
3594 case sizeof(jlong): *(jlong*) addr = (jlong) con; break; | |
3595 default: return false; // strange store size (detect size!=2**N here) | |
3596 } | |
3597 return true; // return success to caller | |
3598 } | |
3599 | |
3600 // Coalesce subword constants into int constants and possibly | |
3601 // into long constants. The goal, if the CPU permits, | |
3602 // is to initialize the object with a small number of 64-bit tiles. | |
3603 // Also, convert floating-point constants to bit patterns. | |
3604 // Non-constants are not relevant to this pass. | |
3605 // | |
3606 // In terms of the running example on InitializeNode::InitializeNode | |
3607 // and InitializeNode::capture_store, here is the transformation | |
3608 // of rawstore1 and rawstore2 into rawstore12: | |
3609 // alloc = (Allocate ...) | |
3610 // rawoop = alloc.RawAddress | |
3611 // tile12 = 0x00010002 | |
3612 // rawstore12 = (StoreI alloc.Control alloc.Memory (+ rawoop 12) tile12) | |
3613 // init = (Initialize alloc.Control alloc.Memory rawoop rawstore12) | |
3614 // | |
3615 void | |
3616 InitializeNode::coalesce_subword_stores(intptr_t header_size, | |
3617 Node* size_in_bytes, | |
3618 PhaseGVN* phase) { | |
3619 Compile* C = phase->C; | |
3620 | |
3621 assert(stores_are_sane(phase), ""); | |
3622 // Note: After this pass, they are not completely sane, | |
3623 // since there may be some overlaps. | |
3624 | |
3625 int old_subword = 0, old_long = 0, new_int = 0, new_long = 0; | |
3626 | |
3627 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
3628 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, ti_limit); | |
3629 size_limit = MIN2(size_limit, ti_limit); | |
3630 size_limit = align_size_up(size_limit, BytesPerLong); | |
3631 int num_tiles = size_limit / BytesPerLong; | |
3632 | |
3633 // allocate space for the tile map: | |
3634 const int small_len = DEBUG_ONLY(true ? 3 :) 30; // keep stack frames small | |
3635 jlong tiles_buf[small_len]; | |
3636 Node* nodes_buf[small_len]; | |
3637 jlong inits_buf[small_len]; | |
3638 jlong* tiles = ((num_tiles <= small_len) ? &tiles_buf[0] | |
3639 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
3640 Node** nodes = ((num_tiles <= small_len) ? &nodes_buf[0] | |
3641 : NEW_RESOURCE_ARRAY(Node*, num_tiles)); | |
3642 jlong* inits = ((num_tiles <= small_len) ? &inits_buf[0] | |
3643 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
3644 // tiles: exact bitwise model of all primitive constants | |
3645 // nodes: last constant-storing node subsumed into the tiles model | |
3646 // inits: which bytes (in each tile) are touched by any initializations | |
3647 | |
3648 //// Pass A: Fill in the tile model with any relevant stores. | |
3649 | |
3650 Copy::zero_to_bytes(tiles, sizeof(tiles[0]) * num_tiles); | |
3651 Copy::zero_to_bytes(nodes, sizeof(nodes[0]) * num_tiles); | |
3652 Copy::zero_to_bytes(inits, sizeof(inits[0]) * num_tiles); | |
3653 Node* zmem = zero_memory(); // initially zero memory state | |
3654 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3655 Node* st = in(i); | |
3656 intptr_t st_off = get_store_offset(st, phase); | |
3657 | |
3658 // Figure out the store's offset and constant value: | |
3659 if (st_off < header_size) continue; //skip (ignore header) | |
3660 if (st->in(MemNode::Memory) != zmem) continue; //skip (odd store chain) | |
3661 int st_size = st->as_Store()->memory_size(); | |
3662 if (st_off + st_size > size_limit) break; | |
3663 | |
3664 // Record which bytes are touched, whether by constant or not. | |
3665 if (!store_constant(inits, num_tiles, st_off, st_size, (jlong) -1)) | |
3666 continue; // skip (strange store size) | |
3667 | |
3668 const Type* val = phase->type(st->in(MemNode::ValueIn)); | |
3669 if (!val->singleton()) continue; //skip (non-con store) | |
3670 BasicType type = val->basic_type(); | |
3671 | |
3672 jlong con = 0; | |
3673 switch (type) { | |
3674 case T_INT: con = val->is_int()->get_con(); break; | |
3675 case T_LONG: con = val->is_long()->get_con(); break; | |
3676 case T_FLOAT: con = jint_cast(val->getf()); break; | |
3677 case T_DOUBLE: con = jlong_cast(val->getd()); break; | |
3678 default: continue; //skip (odd store type) | |
3679 } | |
3680 | |
3681 if (type == T_LONG && Matcher::isSimpleConstant64(con) && | |
3682 st->Opcode() == Op_StoreL) { | |
3683 continue; // This StoreL is already optimal. | |
3684 } | |
3685 | |
3686 // Store down the constant. | |
3687 store_constant(tiles, num_tiles, st_off, st_size, con); | |
3688 | |
3689 intptr_t j = st_off >> LogBytesPerLong; | |
3690 | |
3691 if (type == T_INT && st_size == BytesPerInt | |
3692 && (st_off & BytesPerInt) == BytesPerInt) { | |
3693 jlong lcon = tiles[j]; | |
3694 if (!Matcher::isSimpleConstant64(lcon) && | |
3695 st->Opcode() == Op_StoreI) { | |
3696 // This StoreI is already optimal by itself. | |
3697 jint* intcon = (jint*) &tiles[j]; | |
3698 intcon[1] = 0; // undo the store_constant() | |
3699 | |
3700 // If the previous store is also optimal by itself, back up and | |
3701 // undo the action of the previous loop iteration... if we can. | |
3702 // But if we can't, just let the previous half take care of itself. | |
3703 st = nodes[j]; | |
3704 st_off -= BytesPerInt; | |
3705 con = intcon[0]; | |
3706 if (con != 0 && st != NULL && st->Opcode() == Op_StoreI) { | |
3707 assert(st_off >= header_size, "still ignoring header"); | |
3708 assert(get_store_offset(st, phase) == st_off, "must be"); | |
3709 assert(in(i-1) == zmem, "must be"); | |
3710 DEBUG_ONLY(const Type* tcon = phase->type(st->in(MemNode::ValueIn))); | |
3711 assert(con == tcon->is_int()->get_con(), "must be"); | |
3712 // Undo the effects of the previous loop trip, which swallowed st: | |
3713 intcon[0] = 0; // undo store_constant() | |
3714 set_req(i-1, st); // undo set_req(i, zmem) | |
3715 nodes[j] = NULL; // undo nodes[j] = st | |
3716 --old_subword; // undo ++old_subword | |
3717 } | |
3718 continue; // This StoreI is already optimal. | |
3719 } | |
3720 } | |
3721 | |
3722 // This store is not needed. | |
3723 set_req(i, zmem); | |
3724 nodes[j] = st; // record for the moment | |
3725 if (st_size < BytesPerLong) // something has changed | |
3726 ++old_subword; // includes int/float, but who's counting... | |
3727 else ++old_long; | |
3728 } | |
3729 | |
3730 if ((old_subword + old_long) == 0) | |
3731 return; // nothing more to do | |
3732 | |
3733 //// Pass B: Convert any non-zero tiles into optimal constant stores. | |
3734 // Be sure to insert them before overlapping non-constant stores. | |
3735 // (E.g., byte[] x = { 1,2,y,4 } => x[int 0] = 0x01020004, x[2]=y.) | |
3736 for (int j = 0; j < num_tiles; j++) { | |
3737 jlong con = tiles[j]; | |
3738 jlong init = inits[j]; | |
3739 if (con == 0) continue; | |
3740 jint con0, con1; // split the constant, address-wise | |
3741 jint init0, init1; // split the init map, address-wise | |
3742 { union { jlong con; jint intcon[2]; } u; | |
3743 u.con = con; | |
3744 con0 = u.intcon[0]; | |
3745 con1 = u.intcon[1]; | |
3746 u.con = init; | |
3747 init0 = u.intcon[0]; | |
3748 init1 = u.intcon[1]; | |
3749 } | |
3750 | |
3751 Node* old = nodes[j]; | |
3752 assert(old != NULL, "need the prior store"); | |
3753 intptr_t offset = (j * BytesPerLong); | |
3754 | |
3755 bool split = !Matcher::isSimpleConstant64(con); | |
3756 | |
3757 if (offset < header_size) { | |
3758 assert(offset + BytesPerInt >= header_size, "second int counts"); | |
3759 assert(*(jint*)&tiles[j] == 0, "junk in header"); | |
3760 split = true; // only the second word counts | |
3761 // Example: int a[] = { 42 ... } | |
3762 } else if (con0 == 0 && init0 == -1) { | |
3763 split = true; // first word is covered by full inits | |
3764 // Example: int a[] = { ... foo(), 42 ... } | |
3765 } else if (con1 == 0 && init1 == -1) { | |
3766 split = true; // second word is covered by full inits | |
3767 // Example: int a[] = { ... 42, foo() ... } | |
3768 } | |
3769 | |
3770 // Here's a case where init0 is neither 0 nor -1: | |
3771 // byte a[] = { ... 0,0,foo(),0, 0,0,0,42 ... } | |
3772 // Assuming big-endian memory, init0, init1 are 0x0000FF00, 0x000000FF. | |
3773 // In this case the tile is not split; it is (jlong)42. | |
3774 // The big tile is stored down, and then the foo() value is inserted. | |
3775 // (If there were foo(),foo() instead of foo(),0, init0 would be -1.) | |
3776 | |
3777 Node* ctl = old->in(MemNode::Control); | |
3778 Node* adr = make_raw_address(offset, phase); | |
3779 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
3780 | |
3781 // One or two coalesced stores to plop down. | |
3782 Node* st[2]; | |
3783 intptr_t off[2]; | |
3784 int nst = 0; | |
3785 if (!split) { | |
3786 ++new_long; | |
3787 off[nst] = offset; | |
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3788 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
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3789 phase->longcon(con), T_LONG, MemNode::unordered); |
0 | 3790 } else { |
3791 // Omit either if it is a zero. | |
3792 if (con0 != 0) { | |
3793 ++new_int; | |
3794 off[nst] = offset; | |
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3795 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
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3796 phase->intcon(con0), T_INT, MemNode::unordered); |
0 | 3797 } |
3798 if (con1 != 0) { | |
3799 ++new_int; | |
3800 offset += BytesPerInt; | |
3801 adr = make_raw_address(offset, phase); | |
3802 off[nst] = offset; | |
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3803 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
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3804 phase->intcon(con1), T_INT, MemNode::unordered); |
0 | 3805 } |
3806 } | |
3807 | |
3808 // Insert second store first, then the first before the second. | |
3809 // Insert each one just before any overlapping non-constant stores. | |
3810 while (nst > 0) { | |
3811 Node* st1 = st[--nst]; | |
3812 C->copy_node_notes_to(st1, old); | |
3813 st1 = phase->transform(st1); | |
3814 offset = off[nst]; | |
3815 assert(offset >= header_size, "do not smash header"); | |
3816 int ins_idx = captured_store_insertion_point(offset, /*size:*/0, phase); | |
3817 guarantee(ins_idx != 0, "must re-insert constant store"); | |
3818 if (ins_idx < 0) ins_idx = -ins_idx; // never overlap | |
3819 if (ins_idx > InitializeNode::RawStores && in(ins_idx-1) == zmem) | |
3820 set_req(--ins_idx, st1); | |
3821 else | |
3822 ins_req(ins_idx, st1); | |
3823 } | |
3824 } | |
3825 | |
3826 if (PrintCompilation && WizardMode) | |
3827 tty->print_cr("Changed %d/%d subword/long constants into %d/%d int/long", | |
3828 old_subword, old_long, new_int, new_long); | |
3829 if (C->log() != NULL) | |
3830 C->log()->elem("comment that='%d/%d subword/long to %d/%d int/long'", | |
3831 old_subword, old_long, new_int, new_long); | |
3832 | |
3833 // Clean up any remaining occurrences of zmem: | |
3834 remove_extra_zeroes(); | |
3835 } | |
3836 | |
3837 // Explore forward from in(start) to find the first fully initialized | |
3838 // word, and return its offset. Skip groups of subword stores which | |
3839 // together initialize full words. If in(start) is itself part of a | |
3840 // fully initialized word, return the offset of in(start). If there | |
3841 // are no following full-word stores, or if something is fishy, return | |
3842 // a negative value. | |
3843 intptr_t InitializeNode::find_next_fullword_store(uint start, PhaseGVN* phase) { | |
3844 int int_map = 0; | |
3845 intptr_t int_map_off = 0; | |
3846 const int FULL_MAP = right_n_bits(BytesPerInt); // the int_map we hope for | |
3847 | |
3848 for (uint i = start, limit = req(); i < limit; i++) { | |
3849 Node* st = in(i); | |
3850 | |
3851 intptr_t st_off = get_store_offset(st, phase); | |
3852 if (st_off < 0) break; // return conservative answer | |
3853 | |
3854 int st_size = st->as_Store()->memory_size(); | |
3855 if (st_size >= BytesPerInt && (st_off % BytesPerInt) == 0) { | |
3856 return st_off; // we found a complete word init | |
3857 } | |
3858 | |
3859 // update the map: | |
3860 | |
3861 intptr_t this_int_off = align_size_down(st_off, BytesPerInt); | |
3862 if (this_int_off != int_map_off) { | |
3863 // reset the map: | |
3864 int_map = 0; | |
3865 int_map_off = this_int_off; | |
3866 } | |
3867 | |
3868 int subword_off = st_off - this_int_off; | |
3869 int_map |= right_n_bits(st_size) << subword_off; | |
3870 if ((int_map & FULL_MAP) == FULL_MAP) { | |
3871 return this_int_off; // we found a complete word init | |
3872 } | |
3873 | |
3874 // Did this store hit or cross the word boundary? | |
3875 intptr_t next_int_off = align_size_down(st_off + st_size, BytesPerInt); | |
3876 if (next_int_off == this_int_off + BytesPerInt) { | |
3877 // We passed the current int, without fully initializing it. | |
3878 int_map_off = next_int_off; | |
3879 int_map >>= BytesPerInt; | |
3880 } else if (next_int_off > this_int_off + BytesPerInt) { | |
3881 // We passed the current and next int. | |
3882 return this_int_off + BytesPerInt; | |
3883 } | |
3884 } | |
3885 | |
3886 return -1; | |
3887 } | |
3888 | |
3889 | |
3890 // Called when the associated AllocateNode is expanded into CFG. | |
3891 // At this point, we may perform additional optimizations. | |
3892 // Linearize the stores by ascending offset, to make memory | |
3893 // activity as coherent as possible. | |
3894 Node* InitializeNode::complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
3895 intptr_t header_size, | |
3896 Node* size_in_bytes, | |
3897 PhaseGVN* phase) { | |
3898 assert(!is_complete(), "not already complete"); | |
3899 assert(stores_are_sane(phase), ""); | |
3900 assert(allocation() != NULL, "must be present"); | |
3901 | |
3902 remove_extra_zeroes(); | |
3903 | |
3904 if (ReduceFieldZeroing || ReduceBulkZeroing) | |
3905 // reduce instruction count for common initialization patterns | |
3906 coalesce_subword_stores(header_size, size_in_bytes, phase); | |
3907 | |
3908 Node* zmem = zero_memory(); // initially zero memory state | |
3909 Node* inits = zmem; // accumulating a linearized chain of inits | |
3910 #ifdef ASSERT | |
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3911 intptr_t first_offset = allocation()->minimum_header_size(); |
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3912 intptr_t last_init_off = first_offset; // previous init offset |
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3913 intptr_t last_init_end = first_offset; // previous init offset+size |
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3914 intptr_t last_tile_end = first_offset; // previous tile offset+size |
0 | 3915 #endif |
3916 intptr_t zeroes_done = header_size; | |
3917 | |
3918 bool do_zeroing = true; // we might give up if inits are very sparse | |
3919 int big_init_gaps = 0; // how many large gaps have we seen? | |
3920 | |
3921 if (ZeroTLAB) do_zeroing = false; | |
3922 if (!ReduceFieldZeroing && !ReduceBulkZeroing) do_zeroing = false; | |
3923 | |
3924 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3925 Node* st = in(i); | |
3926 intptr_t st_off = get_store_offset(st, phase); | |
3927 if (st_off < 0) | |
3928 break; // unknown junk in the inits | |
3929 if (st->in(MemNode::Memory) != zmem) | |
3930 break; // complicated store chains somehow in list | |
3931 | |
3932 int st_size = st->as_Store()->memory_size(); | |
3933 intptr_t next_init_off = st_off + st_size; | |
3934 | |
3935 if (do_zeroing && zeroes_done < next_init_off) { | |
3936 // See if this store needs a zero before it or under it. | |
3937 intptr_t zeroes_needed = st_off; | |
3938 | |
3939 if (st_size < BytesPerInt) { | |
3940 // Look for subword stores which only partially initialize words. | |
3941 // If we find some, we must lay down some word-level zeroes first, | |
3942 // underneath the subword stores. | |
3943 // | |
3944 // Examples: | |
3945 // byte[] a = { p,q,r,s } => a[0]=p,a[1]=q,a[2]=r,a[3]=s | |
3946 // byte[] a = { x,y,0,0 } => a[0..3] = 0, a[0]=x,a[1]=y | |
3947 // byte[] a = { 0,0,z,0 } => a[0..3] = 0, a[2]=z | |
3948 // | |
3949 // Note: coalesce_subword_stores may have already done this, | |
3950 // if it was prompted by constant non-zero subword initializers. | |
3951 // But this case can still arise with non-constant stores. | |
3952 | |
3953 intptr_t next_full_store = find_next_fullword_store(i, phase); | |
3954 | |
3955 // In the examples above: | |
3956 // in(i) p q r s x y z | |
3957 // st_off 12 13 14 15 12 13 14 | |
3958 // st_size 1 1 1 1 1 1 1 | |
3959 // next_full_s. 12 16 16 16 16 16 16 | |
3960 // z's_done 12 16 16 16 12 16 12 | |
3961 // z's_needed 12 16 16 16 16 16 16 | |
3962 // zsize 0 0 0 0 4 0 4 | |
3963 if (next_full_store < 0) { | |
3964 // Conservative tack: Zero to end of current word. | |
3965 zeroes_needed = align_size_up(zeroes_needed, BytesPerInt); | |
3966 } else { | |
3967 // Zero to beginning of next fully initialized word. | |
3968 // Or, don't zero at all, if we are already in that word. | |
3969 assert(next_full_store >= zeroes_needed, "must go forward"); | |
3970 assert((next_full_store & (BytesPerInt-1)) == 0, "even boundary"); | |
3971 zeroes_needed = next_full_store; | |
3972 } | |
3973 } | |
3974 | |
3975 if (zeroes_needed > zeroes_done) { | |
3976 intptr_t zsize = zeroes_needed - zeroes_done; | |
3977 // Do some incremental zeroing on rawmem, in parallel with inits. | |
3978 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3979 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3980 zeroes_done, zeroes_needed, | |
3981 phase); | |
3982 zeroes_done = zeroes_needed; | |
3983 if (zsize > Matcher::init_array_short_size && ++big_init_gaps > 2) | |
3984 do_zeroing = false; // leave the hole, next time | |
3985 } | |
3986 } | |
3987 | |
3988 // Collect the store and move on: | |
3989 st->set_req(MemNode::Memory, inits); | |
3990 inits = st; // put it on the linearized chain | |
3991 set_req(i, zmem); // unhook from previous position | |
3992 | |
3993 if (zeroes_done == st_off) | |
3994 zeroes_done = next_init_off; | |
3995 | |
3996 assert(!do_zeroing || zeroes_done >= next_init_off, "don't miss any"); | |
3997 | |
3998 #ifdef ASSERT | |
3999 // Various order invariants. Weaker than stores_are_sane because | |
4000 // a large constant tile can be filled in by smaller non-constant stores. | |
4001 assert(st_off >= last_init_off, "inits do not reverse"); | |
4002 last_init_off = st_off; | |
4003 const Type* val = NULL; | |
4004 if (st_size >= BytesPerInt && | |
4005 (val = phase->type(st->in(MemNode::ValueIn)))->singleton() && | |
4006 (int)val->basic_type() < (int)T_OBJECT) { | |
4007 assert(st_off >= last_tile_end, "tiles do not overlap"); | |
4008 assert(st_off >= last_init_end, "tiles do not overwrite inits"); | |
4009 last_tile_end = MAX2(last_tile_end, next_init_off); | |
4010 } else { | |
4011 intptr_t st_tile_end = align_size_up(next_init_off, BytesPerLong); | |
4012 assert(st_tile_end >= last_tile_end, "inits stay with tiles"); | |
4013 assert(st_off >= last_init_end, "inits do not overlap"); | |
4014 last_init_end = next_init_off; // it's a non-tile | |
4015 } | |
4016 #endif //ASSERT | |
4017 } | |
4018 | |
4019 remove_extra_zeroes(); // clear out all the zmems left over | |
4020 add_req(inits); | |
4021 | |
4022 if (!ZeroTLAB) { | |
4023 // If anything remains to be zeroed, zero it all now. | |
4024 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
4025 // if it is the last unused 4 bytes of an instance, forget about it | |
4026 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint); | |
4027 if (zeroes_done + BytesPerLong >= size_limit) { | |
4028 assert(allocation() != NULL, ""); | |
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4029 if (allocation()->Opcode() == Op_Allocate) { |
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4030 Node* klass_node = allocation()->in(AllocateNode::KlassNode); |
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4031 ciKlass* k = phase->type(klass_node)->is_klassptr()->klass(); |
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4032 if (zeroes_done == k->layout_helper()) |
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4033 zeroes_done = size_limit; |
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4034 } |
0 | 4035 } |
4036 if (zeroes_done < size_limit) { | |
4037 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
4038 zeroes_done, size_in_bytes, phase); | |
4039 } | |
4040 } | |
4041 | |
4042 set_complete(phase); | |
4043 return rawmem; | |
4044 } | |
4045 | |
4046 | |
4047 #ifdef ASSERT | |
4048 bool InitializeNode::stores_are_sane(PhaseTransform* phase) { | |
4049 if (is_complete()) | |
4050 return true; // stores could be anything at this point | |
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4051 assert(allocation() != NULL, "must be present"); |
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4052 intptr_t last_off = allocation()->minimum_header_size(); |
0 | 4053 for (uint i = InitializeNode::RawStores; i < req(); i++) { |
4054 Node* st = in(i); | |
4055 intptr_t st_off = get_store_offset(st, phase); | |
4056 if (st_off < 0) continue; // ignore dead garbage | |
4057 if (last_off > st_off) { | |
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4058 tty->print_cr("*** bad store offset at %d: " INTX_FORMAT " > " INTX_FORMAT, i, last_off, st_off); |
0 | 4059 this->dump(2); |
4060 assert(false, "ascending store offsets"); | |
4061 return false; | |
4062 } | |
4063 last_off = st_off + st->as_Store()->memory_size(); | |
4064 } | |
4065 return true; | |
4066 } | |
4067 #endif //ASSERT | |
4068 | |
4069 | |
4070 | |
4071 | |
4072 //============================MergeMemNode===================================== | |
4073 // | |
4074 // SEMANTICS OF MEMORY MERGES: A MergeMem is a memory state assembled from several | |
4075 // contributing store or call operations. Each contributor provides the memory | |
4076 // state for a particular "alias type" (see Compile::alias_type). For example, | |
4077 // if a MergeMem has an input X for alias category #6, then any memory reference | |
4078 // to alias category #6 may use X as its memory state input, as an exact equivalent | |
4079 // to using the MergeMem as a whole. | |
4080 // Load<6>( MergeMem(<6>: X, ...), p ) <==> Load<6>(X,p) | |
4081 // | |
4082 // (Here, the <N> notation gives the index of the relevant adr_type.) | |
4083 // | |
4084 // In one special case (and more cases in the future), alias categories overlap. | |
4085 // The special alias category "Bot" (Compile::AliasIdxBot) includes all memory | |
4086 // states. Therefore, if a MergeMem has only one contributing input W for Bot, | |
4087 // it is exactly equivalent to that state W: | |
4088 // MergeMem(<Bot>: W) <==> W | |
4089 // | |
4090 // Usually, the merge has more than one input. In that case, where inputs | |
4091 // overlap (i.e., one is Bot), the narrower alias type determines the memory | |
4092 // state for that type, and the wider alias type (Bot) fills in everywhere else: | |
4093 // Load<5>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<5>(W,p) | |
4094 // Load<6>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<6>(X,p) | |
4095 // | |
4096 // A merge can take a "wide" memory state as one of its narrow inputs. | |
4097 // This simply means that the merge observes out only the relevant parts of | |
4098 // the wide input. That is, wide memory states arriving at narrow merge inputs | |
4099 // are implicitly "filtered" or "sliced" as necessary. (This is rare.) | |
4100 // | |
4101 // These rules imply that MergeMem nodes may cascade (via their <Bot> links), | |
4102 // and that memory slices "leak through": | |
4103 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y)) <==> MergeMem(<Bot>: W, <7>: Y) | |
4104 // | |
4105 // But, in such a cascade, repeated memory slices can "block the leak": | |
4106 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y), <7>: Y') <==> MergeMem(<Bot>: W, <7>: Y') | |
4107 // | |
4108 // In the last example, Y is not part of the combined memory state of the | |
4109 // outermost MergeMem. The system must, of course, prevent unschedulable | |
4110 // memory states from arising, so you can be sure that the state Y is somehow | |
4111 // a precursor to state Y'. | |
4112 // | |
4113 // | |
4114 // REPRESENTATION OF MEMORY MERGES: The indexes used to address the Node::in array | |
4115 // of each MergeMemNode array are exactly the numerical alias indexes, including | |
4116 // but not limited to AliasIdxTop, AliasIdxBot, and AliasIdxRaw. The functions | |
4117 // Compile::alias_type (and kin) produce and manage these indexes. | |
4118 // | |
4119 // By convention, the value of in(AliasIdxTop) (i.e., in(1)) is always the top node. | |
4120 // (Note that this provides quick access to the top node inside MergeMem methods, | |
4121 // without the need to reach out via TLS to Compile::current.) | |
4122 // | |
4123 // As a consequence of what was just described, a MergeMem that represents a full | |
4124 // memory state has an edge in(AliasIdxBot) which is a "wide" memory state, | |
4125 // containing all alias categories. | |
4126 // | |
4127 // MergeMem nodes never (?) have control inputs, so in(0) is NULL. | |
4128 // | |
4129 // All other edges in(N) (including in(AliasIdxRaw), which is in(3)) are either | |
4130 // a memory state for the alias type <N>, or else the top node, meaning that | |
4131 // there is no particular input for that alias type. Note that the length of | |
4132 // a MergeMem is variable, and may be extended at any time to accommodate new | |
4133 // memory states at larger alias indexes. When merges grow, they are of course | |
4134 // filled with "top" in the unused in() positions. | |
4135 // | |
4136 // This use of top is named "empty_memory()", or "empty_mem" (no-memory) as a variable. | |
4137 // (Top was chosen because it works smoothly with passes like GCM.) | |
4138 // | |
4139 // For convenience, we hardwire the alias index for TypeRawPtr::BOTTOM. (It is | |
4140 // the type of random VM bits like TLS references.) Since it is always the | |
4141 // first non-Bot memory slice, some low-level loops use it to initialize an | |
4142 // index variable: for (i = AliasIdxRaw; i < req(); i++). | |
4143 // | |
4144 // | |
4145 // ACCESSORS: There is a special accessor MergeMemNode::base_memory which returns | |
4146 // the distinguished "wide" state. The accessor MergeMemNode::memory_at(N) returns | |
4147 // the memory state for alias type <N>, or (if there is no particular slice at <N>, | |
4148 // it returns the base memory. To prevent bugs, memory_at does not accept <Top> | |
4149 // or <Bot> indexes. The iterator MergeMemStream provides robust iteration over | |
4150 // MergeMem nodes or pairs of such nodes, ensuring that the non-top edges are visited. | |
4151 // | |
4152 // %%%% We may get rid of base_memory as a separate accessor at some point; it isn't | |
4153 // really that different from the other memory inputs. An abbreviation called | |
4154 // "bot_memory()" for "memory_at(AliasIdxBot)" would keep code tidy. | |
4155 // | |
4156 // | |
4157 // PARTIAL MEMORY STATES: During optimization, MergeMem nodes may arise that represent | |
4158 // partial memory states. When a Phi splits through a MergeMem, the copy of the Phi | |
4159 // that "emerges though" the base memory will be marked as excluding the alias types | |
4160 // of the other (narrow-memory) copies which "emerged through" the narrow edges: | |
4161 // | |
4162 // Phi<Bot>(U, MergeMem(<Bot>: W, <8>: Y)) | |
4163 // ==Ideal=> MergeMem(<Bot>: Phi<Bot-8>(U, W), Phi<8>(U, Y)) | |
4164 // | |
4165 // This strange "subtraction" effect is necessary to ensure IGVN convergence. | |
4166 // (It is currently unimplemented.) As you can see, the resulting merge is | |
4167 // actually a disjoint union of memory states, rather than an overlay. | |
4168 // | |
4169 | |
4170 //------------------------------MergeMemNode----------------------------------- | |
4171 Node* MergeMemNode::make_empty_memory() { | |
4172 Node* empty_memory = (Node*) Compile::current()->top(); | |
4173 assert(empty_memory->is_top(), "correct sentinel identity"); | |
4174 return empty_memory; | |
4175 } | |
4176 | |
4177 MergeMemNode::MergeMemNode(Node *new_base) : Node(1+Compile::AliasIdxRaw) { | |
4178 init_class_id(Class_MergeMem); | |
4179 // all inputs are nullified in Node::Node(int) | |
4180 // set_input(0, NULL); // no control input | |
4181 | |
4182 // Initialize the edges uniformly to top, for starters. | |
4183 Node* empty_mem = make_empty_memory(); | |
4184 for (uint i = Compile::AliasIdxTop; i < req(); i++) { | |
4185 init_req(i,empty_mem); | |
4186 } | |
4187 assert(empty_memory() == empty_mem, ""); | |
4188 | |
4189 if( new_base != NULL && new_base->is_MergeMem() ) { | |
4190 MergeMemNode* mdef = new_base->as_MergeMem(); | |
4191 assert(mdef->empty_memory() == empty_mem, "consistent sentinels"); | |
4192 for (MergeMemStream mms(this, mdef); mms.next_non_empty2(); ) { | |
4193 mms.set_memory(mms.memory2()); | |
4194 } | |
4195 assert(base_memory() == mdef->base_memory(), ""); | |
4196 } else { | |
4197 set_base_memory(new_base); | |
4198 } | |
4199 } | |
4200 | |
4201 // Make a new, untransformed MergeMem with the same base as 'mem'. | |
4202 // If mem is itself a MergeMem, populate the result with the same edges. | |
4203 MergeMemNode* MergeMemNode::make(Compile* C, Node* mem) { | |
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4204 return new(C) MergeMemNode(mem); |
0 | 4205 } |
4206 | |
4207 //------------------------------cmp-------------------------------------------- | |
4208 uint MergeMemNode::hash() const { return NO_HASH; } | |
4209 uint MergeMemNode::cmp( const Node &n ) const { | |
4210 return (&n == this); // Always fail except on self | |
4211 } | |
4212 | |
4213 //------------------------------Identity--------------------------------------- | |
4214 Node* MergeMemNode::Identity(PhaseTransform *phase) { | |
4215 // Identity if this merge point does not record any interesting memory | |
4216 // disambiguations. | |
4217 Node* base_mem = base_memory(); | |
4218 Node* empty_mem = empty_memory(); | |
4219 if (base_mem != empty_mem) { // Memory path is not dead? | |
4220 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4221 Node* mem = in(i); | |
4222 if (mem != empty_mem && mem != base_mem) { | |
4223 return this; // Many memory splits; no change | |
4224 } | |
4225 } | |
4226 } | |
4227 return base_mem; // No memory splits; ID on the one true input | |
4228 } | |
4229 | |
4230 //------------------------------Ideal------------------------------------------ | |
4231 // This method is invoked recursively on chains of MergeMem nodes | |
4232 Node *MergeMemNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
4233 // Remove chain'd MergeMems | |
4234 // | |
4235 // This is delicate, because the each "in(i)" (i >= Raw) is interpreted | |
4236 // relative to the "in(Bot)". Since we are patching both at the same time, | |
4237 // we have to be careful to read each "in(i)" relative to the old "in(Bot)", | |
4238 // but rewrite each "in(i)" relative to the new "in(Bot)". | |
4239 Node *progress = NULL; | |
4240 | |
4241 | |
4242 Node* old_base = base_memory(); | |
4243 Node* empty_mem = empty_memory(); | |
4244 if (old_base == empty_mem) | |
4245 return NULL; // Dead memory path. | |
4246 | |
4247 MergeMemNode* old_mbase; | |
4248 if (old_base != NULL && old_base->is_MergeMem()) | |
4249 old_mbase = old_base->as_MergeMem(); | |
4250 else | |
4251 old_mbase = NULL; | |
4252 Node* new_base = old_base; | |
4253 | |
4254 // simplify stacked MergeMems in base memory | |
4255 if (old_mbase) new_base = old_mbase->base_memory(); | |
4256 | |
4257 // the base memory might contribute new slices beyond my req() | |
4258 if (old_mbase) grow_to_match(old_mbase); | |
4259 | |
4260 // Look carefully at the base node if it is a phi. | |
4261 PhiNode* phi_base; | |
4262 if (new_base != NULL && new_base->is_Phi()) | |
4263 phi_base = new_base->as_Phi(); | |
4264 else | |
4265 phi_base = NULL; | |
4266 | |
4267 Node* phi_reg = NULL; | |
4268 uint phi_len = (uint)-1; | |
4269 if (phi_base != NULL && !phi_base->is_copy()) { | |
4270 // do not examine phi if degraded to a copy | |
4271 phi_reg = phi_base->region(); | |
4272 phi_len = phi_base->req(); | |
4273 // see if the phi is unfinished | |
4274 for (uint i = 1; i < phi_len; i++) { | |
4275 if (phi_base->in(i) == NULL) { | |
4276 // incomplete phi; do not look at it yet! | |
4277 phi_reg = NULL; | |
4278 phi_len = (uint)-1; | |
4279 break; | |
4280 } | |
4281 } | |
4282 } | |
4283 | |
4284 // Note: We do not call verify_sparse on entry, because inputs | |
4285 // can normalize to the base_memory via subsume_node or similar | |
4286 // mechanisms. This method repairs that damage. | |
4287 | |
4288 assert(!old_mbase || old_mbase->is_empty_memory(empty_mem), "consistent sentinels"); | |
4289 | |
4290 // Look at each slice. | |
4291 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4292 Node* old_in = in(i); | |
4293 // calculate the old memory value | |
4294 Node* old_mem = old_in; | |
4295 if (old_mem == empty_mem) old_mem = old_base; | |
4296 assert(old_mem == memory_at(i), ""); | |
4297 | |
4298 // maybe update (reslice) the old memory value | |
4299 | |
4300 // simplify stacked MergeMems | |
4301 Node* new_mem = old_mem; | |
4302 MergeMemNode* old_mmem; | |
4303 if (old_mem != NULL && old_mem->is_MergeMem()) | |
4304 old_mmem = old_mem->as_MergeMem(); | |
4305 else | |
4306 old_mmem = NULL; | |
4307 if (old_mmem == this) { | |
4308 // This can happen if loops break up and safepoints disappear. | |
4309 // A merge of BotPtr (default) with a RawPtr memory derived from a | |
4310 // safepoint can be rewritten to a merge of the same BotPtr with | |
4311 // the BotPtr phi coming into the loop. If that phi disappears | |
4312 // also, we can end up with a self-loop of the mergemem. | |
4313 // In general, if loops degenerate and memory effects disappear, | |
4314 // a mergemem can be left looking at itself. This simply means | |
4315 // that the mergemem's default should be used, since there is | |
4316 // no longer any apparent effect on this slice. | |
4317 // Note: If a memory slice is a MergeMem cycle, it is unreachable | |
4318 // from start. Update the input to TOP. | |
4319 new_mem = (new_base == this || new_base == empty_mem)? empty_mem : new_base; | |
4320 } | |
4321 else if (old_mmem != NULL) { | |
4322 new_mem = old_mmem->memory_at(i); | |
4323 } | |
605 | 4324 // else preceding memory was not a MergeMem |
0 | 4325 |
4326 // replace equivalent phis (unfortunately, they do not GVN together) | |
4327 if (new_mem != NULL && new_mem != new_base && | |
4328 new_mem->req() == phi_len && new_mem->in(0) == phi_reg) { | |
4329 if (new_mem->is_Phi()) { | |
4330 PhiNode* phi_mem = new_mem->as_Phi(); | |
4331 for (uint i = 1; i < phi_len; i++) { | |
4332 if (phi_base->in(i) != phi_mem->in(i)) { | |
4333 phi_mem = NULL; | |
4334 break; | |
4335 } | |
4336 } | |
4337 if (phi_mem != NULL) { | |
4338 // equivalent phi nodes; revert to the def | |
4339 new_mem = new_base; | |
4340 } | |
4341 } | |
4342 } | |
4343 | |
4344 // maybe store down a new value | |
4345 Node* new_in = new_mem; | |
4346 if (new_in == new_base) new_in = empty_mem; | |
4347 | |
4348 if (new_in != old_in) { | |
4349 // Warning: Do not combine this "if" with the previous "if" | |
4350 // A memory slice might have be be rewritten even if it is semantically | |
4351 // unchanged, if the base_memory value has changed. | |
4352 set_req(i, new_in); | |
4353 progress = this; // Report progress | |
4354 } | |
4355 } | |
4356 | |
4357 if (new_base != old_base) { | |
4358 set_req(Compile::AliasIdxBot, new_base); | |
4359 // Don't use set_base_memory(new_base), because we need to update du. | |
4360 assert(base_memory() == new_base, ""); | |
4361 progress = this; | |
4362 } | |
4363 | |
4364 if( base_memory() == this ) { | |
4365 // a self cycle indicates this memory path is dead | |
4366 set_req(Compile::AliasIdxBot, empty_mem); | |
4367 } | |
4368 | |
4369 // Resolve external cycles by calling Ideal on a MergeMem base_memory | |
4370 // Recursion must occur after the self cycle check above | |
4371 if( base_memory()->is_MergeMem() ) { | |
4372 MergeMemNode *new_mbase = base_memory()->as_MergeMem(); | |
4373 Node *m = phase->transform(new_mbase); // Rollup any cycles | |
4374 if( m != NULL && (m->is_top() || | |
4375 m->is_MergeMem() && m->as_MergeMem()->base_memory() == empty_mem) ) { | |
4376 // propagate rollup of dead cycle to self | |
4377 set_req(Compile::AliasIdxBot, empty_mem); | |
4378 } | |
4379 } | |
4380 | |
4381 if( base_memory() == empty_mem ) { | |
4382 progress = this; | |
4383 // Cut inputs during Parse phase only. | |
4384 // During Optimize phase a dead MergeMem node will be subsumed by Top. | |
4385 if( !can_reshape ) { | |
4386 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4387 if( in(i) != empty_mem ) { set_req(i, empty_mem); } | |
4388 } | |
4389 } | |
4390 } | |
4391 | |
4392 if( !progress && base_memory()->is_Phi() && can_reshape ) { | |
4393 // Check if PhiNode::Ideal's "Split phis through memory merges" | |
4394 // transform should be attempted. Look for this->phi->this cycle. | |
4395 uint merge_width = req(); | |
4396 if (merge_width > Compile::AliasIdxRaw) { | |
4397 PhiNode* phi = base_memory()->as_Phi(); | |
4398 for( uint i = 1; i < phi->req(); ++i ) {// For all paths in | |
4399 if (phi->in(i) == this) { | |
4400 phase->is_IterGVN()->_worklist.push(phi); | |
4401 break; | |
4402 } | |
4403 } | |
4404 } | |
4405 } | |
4406 | |
64
b8f5ba577b02
6673473: (Escape Analysis) Add the instance's field information to PhiNode
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parents:
43
diff
changeset
|
4407 assert(progress || verify_sparse(), "please, no dups of base"); |
0 | 4408 return progress; |
4409 } | |
4410 | |
4411 //-------------------------set_base_memory------------------------------------- | |
4412 void MergeMemNode::set_base_memory(Node *new_base) { | |
4413 Node* empty_mem = empty_memory(); | |
4414 set_req(Compile::AliasIdxBot, new_base); | |
4415 assert(memory_at(req()) == new_base, "must set default memory"); | |
4416 // Clear out other occurrences of new_base: | |
4417 if (new_base != empty_mem) { | |
4418 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4419 if (in(i) == new_base) set_req(i, empty_mem); | |
4420 } | |
4421 } | |
4422 } | |
4423 | |
4424 //------------------------------out_RegMask------------------------------------ | |
4425 const RegMask &MergeMemNode::out_RegMask() const { | |
4426 return RegMask::Empty; | |
4427 } | |
4428 | |
4429 //------------------------------dump_spec-------------------------------------- | |
4430 #ifndef PRODUCT | |
4431 void MergeMemNode::dump_spec(outputStream *st) const { | |
4432 st->print(" {"); | |
4433 Node* base_mem = base_memory(); | |
4434 for( uint i = Compile::AliasIdxRaw; i < req(); i++ ) { | |
4435 Node* mem = memory_at(i); | |
4436 if (mem == base_mem) { st->print(" -"); continue; } | |
4437 st->print( " N%d:", mem->_idx ); | |
4438 Compile::current()->get_adr_type(i)->dump_on(st); | |
4439 } | |
4440 st->print(" }"); | |
4441 } | |
4442 #endif // !PRODUCT | |
4443 | |
4444 | |
4445 #ifdef ASSERT | |
4446 static bool might_be_same(Node* a, Node* b) { | |
4447 if (a == b) return true; | |
4448 if (!(a->is_Phi() || b->is_Phi())) return false; | |
4449 // phis shift around during optimization | |
4450 return true; // pretty stupid... | |
4451 } | |
4452 | |
4453 // verify a narrow slice (either incoming or outgoing) | |
4454 static void verify_memory_slice(const MergeMemNode* m, int alias_idx, Node* n) { | |
4455 if (!VerifyAliases) return; // don't bother to verify unless requested | |
4456 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
4457 if (Node::in_dump()) return; // muzzle asserts when printing | |
4458 assert(alias_idx >= Compile::AliasIdxRaw, "must not disturb base_memory or sentinel"); | |
4459 assert(n != NULL, ""); | |
4460 // Elide intervening MergeMem's | |
4461 while (n->is_MergeMem()) { | |
4462 n = n->as_MergeMem()->memory_at(alias_idx); | |
4463 } | |
4464 Compile* C = Compile::current(); | |
4465 const TypePtr* n_adr_type = n->adr_type(); | |
4466 if (n == m->empty_memory()) { | |
4467 // Implicit copy of base_memory() | |
4468 } else if (n_adr_type != TypePtr::BOTTOM) { | |
4469 assert(n_adr_type != NULL, "new memory must have a well-defined adr_type"); | |
4470 assert(C->must_alias(n_adr_type, alias_idx), "new memory must match selected slice"); | |
4471 } else { | |
4472 // A few places like make_runtime_call "know" that VM calls are narrow, | |
4473 // and can be used to update only the VM bits stored as TypeRawPtr::BOTTOM. | |
4474 bool expected_wide_mem = false; | |
4475 if (n == m->base_memory()) { | |
4476 expected_wide_mem = true; | |
4477 } else if (alias_idx == Compile::AliasIdxRaw || | |
4478 n == m->memory_at(Compile::AliasIdxRaw)) { | |
4479 expected_wide_mem = true; | |
4480 } else if (!C->alias_type(alias_idx)->is_rewritable()) { | |
4481 // memory can "leak through" calls on channels that | |
4482 // are write-once. Allow this also. | |
4483 expected_wide_mem = true; | |
4484 } | |
4485 assert(expected_wide_mem, "expected narrow slice replacement"); | |
4486 } | |
4487 } | |
4488 #else // !ASSERT | |
10973
ef57c43512d6
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10278
diff
changeset
|
4489 #define verify_memory_slice(m,i,n) (void)(0) // PRODUCT version is no-op |
0 | 4490 #endif |
4491 | |
4492 | |
4493 //-----------------------------memory_at--------------------------------------- | |
4494 Node* MergeMemNode::memory_at(uint alias_idx) const { | |
4495 assert(alias_idx >= Compile::AliasIdxRaw || | |
4496 alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, | |
4497 "must avoid base_memory and AliasIdxTop"); | |
4498 | |
4499 // Otherwise, it is a narrow slice. | |
4500 Node* n = alias_idx < req() ? in(alias_idx) : empty_memory(); | |
4501 Compile *C = Compile::current(); | |
4502 if (is_empty_memory(n)) { | |
4503 // the array is sparse; empty slots are the "top" node | |
4504 n = base_memory(); | |
4505 assert(Node::in_dump() | |
4506 || n == NULL || n->bottom_type() == Type::TOP | |
2317
5a41a201d08c
6812217: Base memory of MergeMem node violates assert during killing expanded AllocateArray node
kvn
parents:
2004
diff
changeset
|
4507 || n->adr_type() == NULL // address is TOP |
0 | 4508 || n->adr_type() == TypePtr::BOTTOM |
4509 || n->adr_type() == TypeRawPtr::BOTTOM | |
4510 || Compile::current()->AliasLevel() == 0, | |
4511 "must be a wide memory"); | |
4512 // AliasLevel == 0 if we are organizing the memory states manually. | |
4513 // See verify_memory_slice for comments on TypeRawPtr::BOTTOM. | |
4514 } else { | |
4515 // make sure the stored slice is sane | |
4516 #ifdef ASSERT | |
4517 if (is_error_reported() || Node::in_dump()) { | |
4518 } else if (might_be_same(n, base_memory())) { | |
4519 // Give it a pass: It is a mostly harmless repetition of the base. | |
4520 // This can arise normally from node subsumption during optimization. | |
4521 } else { | |
4522 verify_memory_slice(this, alias_idx, n); | |
4523 } | |
4524 #endif | |
4525 } | |
4526 return n; | |
4527 } | |
4528 | |
4529 //---------------------------set_memory_at------------------------------------- | |
4530 void MergeMemNode::set_memory_at(uint alias_idx, Node *n) { | |
4531 verify_memory_slice(this, alias_idx, n); | |
4532 Node* empty_mem = empty_memory(); | |
4533 if (n == base_memory()) n = empty_mem; // collapse default | |
4534 uint need_req = alias_idx+1; | |
4535 if (req() < need_req) { | |
4536 if (n == empty_mem) return; // already the default, so do not grow me | |
4537 // grow the sparse array | |
4538 do { | |
4539 add_req(empty_mem); | |
4540 } while (req() < need_req); | |
4541 } | |
4542 set_req( alias_idx, n ); | |
4543 } | |
4544 | |
4545 | |
4546 | |
4547 //--------------------------iteration_setup------------------------------------ | |
4548 void MergeMemNode::iteration_setup(const MergeMemNode* other) { | |
4549 if (other != NULL) { | |
4550 grow_to_match(other); | |
4551 // invariant: the finite support of mm2 is within mm->req() | |
4552 #ifdef ASSERT | |
4553 for (uint i = req(); i < other->req(); i++) { | |
4554 assert(other->is_empty_memory(other->in(i)), "slice left uncovered"); | |
4555 } | |
4556 #endif | |
4557 } | |
4558 // Replace spurious copies of base_memory by top. | |
4559 Node* base_mem = base_memory(); | |
4560 if (base_mem != NULL && !base_mem->is_top()) { | |
4561 for (uint i = Compile::AliasIdxBot+1, imax = req(); i < imax; i++) { | |
4562 if (in(i) == base_mem) | |
4563 set_req(i, empty_memory()); | |
4564 } | |
4565 } | |
4566 } | |
4567 | |
4568 //---------------------------grow_to_match------------------------------------- | |
4569 void MergeMemNode::grow_to_match(const MergeMemNode* other) { | |
4570 Node* empty_mem = empty_memory(); | |
4571 assert(other->is_empty_memory(empty_mem), "consistent sentinels"); | |
4572 // look for the finite support of the other memory | |
4573 for (uint i = other->req(); --i >= req(); ) { | |
4574 if (other->in(i) != empty_mem) { | |
4575 uint new_len = i+1; | |
4576 while (req() < new_len) add_req(empty_mem); | |
4577 break; | |
4578 } | |
4579 } | |
4580 } | |
4581 | |
4582 //---------------------------verify_sparse------------------------------------- | |
4583 #ifndef PRODUCT | |
4584 bool MergeMemNode::verify_sparse() const { | |
4585 assert(is_empty_memory(make_empty_memory()), "sane sentinel"); | |
4586 Node* base_mem = base_memory(); | |
4587 // The following can happen in degenerate cases, since empty==top. | |
4588 if (is_empty_memory(base_mem)) return true; | |
4589 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4590 assert(in(i) != NULL, "sane slice"); | |
4591 if (in(i) == base_mem) return false; // should have been the sentinel value! | |
4592 } | |
4593 return true; | |
4594 } | |
4595 | |
4596 bool MergeMemStream::match_memory(Node* mem, const MergeMemNode* mm, int idx) { | |
4597 Node* n; | |
4598 n = mm->in(idx); | |
4599 if (mem == n) return true; // might be empty_memory() | |
4600 n = (idx == Compile::AliasIdxBot)? mm->base_memory(): mm->memory_at(idx); | |
4601 if (mem == n) return true; | |
4602 while (n->is_Phi() && (n = n->as_Phi()->is_copy()) != NULL) { | |
4603 if (mem == n) return true; | |
4604 if (n == NULL) break; | |
4605 } | |
4606 return false; | |
4607 } | |
4608 #endif // !PRODUCT |