Mercurial > hg > truffle
annotate src/share/vm/opto/memnode.cpp @ 20642:ec2c6fdd1ce6
8062870: src/share/vm/services/mallocTracker.hpp:64 assert(_count > 0) failed: Negative counter
Summary: Signed bitfield size y can only have (1 << y)-1 values.
Reviewed-by: shade, dholmes, jrose, ctornqvi, gtriantafill
author | coleenp |
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date | Fri, 14 Nov 2014 17:39:38 -0500 |
parents | e7b3d177adda |
children | e194d26c9f4e |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 * | |
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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 |
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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 } | |
881 } | |
882 #endif | |
883 | |
1609 | 884 #ifdef ASSERT |
885 //----------------------------is_immutable_value------------------------------- | |
886 // Helper function to allow a raw load without control edge for some cases | |
887 bool LoadNode::is_immutable_value(Node* adr) { | |
888 return (adr->is_AddP() && adr->in(AddPNode::Base)->is_top() && | |
889 adr->in(AddPNode::Address)->Opcode() == Op_ThreadLocal && | |
890 (adr->in(AddPNode::Offset)->find_intptr_t_con(-1) == | |
891 in_bytes(JavaThread::osthread_offset()))); | |
892 } | |
893 #endif | |
0 | 894 |
895 //----------------------------LoadNode::make----------------------------------- | |
896 // Polymorphic factory method: | |
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897 Node *LoadNode::make(PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const TypePtr* adr_type, const Type *rt, BasicType bt, MemOrd mo) { |
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898 Compile* C = gvn.C; |
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899 |
0 | 900 // sanity check the alias category against the created node type |
901 assert(!(adr_type->isa_oopptr() && | |
902 adr_type->offset() == oopDesc::klass_offset_in_bytes()), | |
903 "use LoadKlassNode instead"); | |
904 assert(!(adr_type->isa_aryptr() && | |
905 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()), | |
906 "use LoadRangeNode instead"); | |
1609 | 907 // Check control edge of raw loads |
908 assert( ctl != NULL || C->get_alias_index(adr_type) != Compile::AliasIdxRaw || | |
909 // oop will be recorded in oop map if load crosses safepoint | |
910 rt->isa_oopptr() || is_immutable_value(adr), | |
911 "raw memory operations should have control edge"); | |
0 | 912 switch (bt) { |
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913 case T_BOOLEAN: return new (C) LoadUBNode(ctl, mem, adr, adr_type, rt->is_int(), mo); |
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914 case T_BYTE: return new (C) LoadBNode (ctl, mem, adr, adr_type, rt->is_int(), mo); |
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915 case T_INT: return new (C) LoadINode (ctl, mem, adr, adr_type, rt->is_int(), mo); |
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916 case T_CHAR: return new (C) LoadUSNode(ctl, mem, adr, adr_type, rt->is_int(), mo); |
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917 case T_SHORT: return new (C) LoadSNode (ctl, mem, adr, adr_type, rt->is_int(), mo); |
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918 case T_LONG: return new (C) LoadLNode (ctl, mem, adr, adr_type, rt->is_long(), mo); |
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919 case T_FLOAT: return new (C) LoadFNode (ctl, mem, adr, adr_type, rt, mo); |
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920 case T_DOUBLE: return new (C) LoadDNode (ctl, mem, adr, adr_type, rt, mo); |
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921 case T_ADDRESS: return new (C) LoadPNode (ctl, mem, adr, adr_type, rt->is_ptr(), mo); |
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922 case T_OBJECT: |
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923 #ifdef _LP64 |
163 | 924 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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925 Node* load = gvn.transform(new (C) LoadNNode(ctl, mem, adr, adr_type, rt->make_narrowoop(), mo)); |
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926 return new (C) DecodeNNode(load, load->bottom_type()->make_ptr()); |
113
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927 } else |
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928 #endif |
163 | 929 { |
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930 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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931 return new (C) LoadPNode(ctl, mem, adr, adr_type, rt->is_oopptr(), mo); |
163 | 932 } |
0 | 933 } |
934 ShouldNotReachHere(); | |
935 return (LoadNode*)NULL; | |
936 } | |
937 | |
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938 LoadLNode* LoadLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt, MemOrd mo) { |
0 | 939 bool require_atomic = true; |
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940 return new (C) LoadLNode(ctl, mem, adr, adr_type, rt->is_long(), mo, require_atomic); |
0 | 941 } |
942 | |
943 | |
944 | |
945 | |
946 //------------------------------hash------------------------------------------- | |
947 uint LoadNode::hash() const { | |
948 // unroll addition of interesting fields | |
949 return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address); | |
950 } | |
951 | |
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952 static bool skip_through_membars(Compile::AliasType* atp, const TypeInstPtr* tp, bool eliminate_boxing) { |
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953 if ((atp != NULL) && (atp->index() >= Compile::AliasIdxRaw)) { |
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954 bool non_volatile = (atp->field() != NULL) && !atp->field()->is_volatile(); |
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955 bool is_stable_ary = FoldStableValues && |
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956 (tp != NULL) && (tp->isa_aryptr() != NULL) && |
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957 tp->isa_aryptr()->is_stable(); |
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958 |
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959 return (eliminate_boxing && non_volatile) || is_stable_ary; |
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960 } |
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961 |
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962 return false; |
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963 } |
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964 |
0 | 965 //---------------------------can_see_stored_value------------------------------ |
966 // This routine exists to make sure this set of tests is done the same | |
967 // everywhere. We need to make a coordinated change: first LoadNode::Ideal | |
968 // will change the graph shape in a way which makes memory alive twice at the | |
969 // same time (uses the Oracle model of aliasing), then some | |
970 // LoadXNode::Identity will fold things back to the equivalence-class model | |
971 // of aliasing. | |
972 Node* MemNode::can_see_stored_value(Node* st, PhaseTransform* phase) const { | |
973 Node* ld_adr = in(MemNode::Address); | |
10278 | 974 intptr_t ld_off = 0; |
975 AllocateNode* ld_alloc = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off); | |
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976 const TypeInstPtr* tp = phase->type(ld_adr)->isa_instptr(); |
10278 | 977 Compile::AliasType* atp = (tp != NULL) ? phase->C->alias_type(tp) : NULL; |
978 // This is more general than load from boxing objects. | |
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979 if (skip_through_membars(atp, tp, phase->C->eliminate_boxing())) { |
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980 uint alias_idx = atp->index(); |
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981 bool final = !atp->is_rewritable(); |
17
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982 Node* result = NULL; |
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983 Node* current = st; |
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984 // Skip through chains of MemBarNodes checking the MergeMems for |
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985 // new states for the slice of this load. Stop once any other |
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986 // kind of node is encountered. Loads from final memory can skip |
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987 // through any kind of MemBar but normal loads shouldn't skip |
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988 // through MemBarAcquire since the could allow them to move out of |
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989 // a synchronized region. |
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990 while (current->is_Proj()) { |
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991 int opc = current->in(0)->Opcode(); |
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992 if ((final && (opc == Op_MemBarAcquire || |
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993 opc == Op_MemBarAcquireLock || |
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994 opc == Op_LoadFence)) || |
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995 opc == Op_MemBarRelease || |
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996 opc == Op_StoreFence || |
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997 opc == Op_MemBarReleaseLock || |
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998 opc == Op_MemBarCPUOrder) { |
17
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999 Node* mem = current->in(0)->in(TypeFunc::Memory); |
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1000 if (mem->is_MergeMem()) { |
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1001 MergeMemNode* merge = mem->as_MergeMem(); |
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1002 Node* new_st = merge->memory_at(alias_idx); |
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1003 if (new_st == merge->base_memory()) { |
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1004 // Keep searching |
10278 | 1005 current = new_st; |
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1006 continue; |
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1007 } |
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1008 // Save the new memory state for the slice and fall through |
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1009 // to exit. |
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1010 result = new_st; |
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1011 } |
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1012 } |
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1013 break; |
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1014 } |
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1015 if (result != NULL) { |
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1016 st = result; |
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1017 } |
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1018 } |
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1019 |
0 | 1020 // Loop around twice in the case Load -> Initialize -> Store. |
1021 // (See PhaseIterGVN::add_users_to_worklist, which knows about this case.) | |
1022 for (int trip = 0; trip <= 1; trip++) { | |
1023 | |
1024 if (st->is_Store()) { | |
1025 Node* st_adr = st->in(MemNode::Address); | |
1026 if (!phase->eqv(st_adr, ld_adr)) { | |
1027 // Try harder before giving up... Match raw and non-raw pointers. | |
1028 intptr_t st_off = 0; | |
1029 AllocateNode* alloc = AllocateNode::Ideal_allocation(st_adr, phase, st_off); | |
1030 if (alloc == NULL) return NULL; | |
10278 | 1031 if (alloc != ld_alloc) return NULL; |
0 | 1032 if (ld_off != st_off) return NULL; |
1033 // At this point we have proven something like this setup: | |
1034 // A = Allocate(...) | |
1035 // L = LoadQ(, AddP(CastPP(, A.Parm),, #Off)) | |
1036 // S = StoreQ(, AddP(, A.Parm , #Off), V) | |
1037 // (Actually, we haven't yet proven the Q's are the same.) | |
1038 // In other words, we are loading from a casted version of | |
1039 // the same pointer-and-offset that we stored to. | |
1040 // Thus, we are able to replace L by V. | |
1041 } | |
1042 // Now prove that we have a LoadQ matched to a StoreQ, for some Q. | |
1043 if (store_Opcode() != st->Opcode()) | |
1044 return NULL; | |
1045 return st->in(MemNode::ValueIn); | |
1046 } | |
1047 | |
1048 // A load from a freshly-created object always returns zero. | |
1049 // (This can happen after LoadNode::Ideal resets the load's memory input | |
1050 // to find_captured_store, which returned InitializeNode::zero_memory.) | |
1051 if (st->is_Proj() && st->in(0)->is_Allocate() && | |
10278 | 1052 (st->in(0) == ld_alloc) && |
1053 (ld_off >= st->in(0)->as_Allocate()->minimum_header_size())) { | |
0 | 1054 // return a zero value for the load's basic type |
1055 // (This is one of the few places where a generic PhaseTransform | |
1056 // can create new nodes. Think of it as lazily manifesting | |
1057 // virtually pre-existing constants.) | |
1058 return phase->zerocon(memory_type()); | |
1059 } | |
1060 | |
1061 // A load from an initialization barrier can match a captured store. | |
1062 if (st->is_Proj() && st->in(0)->is_Initialize()) { | |
1063 InitializeNode* init = st->in(0)->as_Initialize(); | |
1064 AllocateNode* alloc = init->allocation(); | |
10278 | 1065 if ((alloc != NULL) && (alloc == ld_alloc)) { |
0 | 1066 // examine a captured store value |
10278 | 1067 st = init->find_captured_store(ld_off, memory_size(), phase); |
0 | 1068 if (st != NULL) |
1069 continue; // take one more trip around | |
1070 } | |
1071 } | |
1072 | |
10278 | 1073 // Load boxed value from result of valueOf() call is input parameter. |
1074 if (this->is_Load() && ld_adr->is_AddP() && | |
1075 (tp != NULL) && tp->is_ptr_to_boxed_value()) { | |
1076 intptr_t ignore = 0; | |
1077 Node* base = AddPNode::Ideal_base_and_offset(ld_adr, phase, ignore); | |
1078 if (base != NULL && base->is_Proj() && | |
1079 base->as_Proj()->_con == TypeFunc::Parms && | |
1080 base->in(0)->is_CallStaticJava() && | |
1081 base->in(0)->as_CallStaticJava()->is_boxing_method()) { | |
1082 return base->in(0)->in(TypeFunc::Parms); | |
1083 } | |
1084 } | |
1085 | |
0 | 1086 break; |
1087 } | |
1088 | |
1089 return NULL; | |
1090 } | |
1091 | |
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1092 //----------------------is_instance_field_load_with_local_phi------------------ |
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1093 bool LoadNode::is_instance_field_load_with_local_phi(Node* ctrl) { |
10278 | 1094 if( in(Memory)->is_Phi() && in(Memory)->in(0) == ctrl && |
1095 in(Address)->is_AddP() ) { | |
1096 const TypeOopPtr* t_oop = in(Address)->bottom_type()->isa_oopptr(); | |
1097 // Only instances and boxed values. | |
1098 if( t_oop != NULL && | |
1099 (t_oop->is_ptr_to_boxed_value() || | |
1100 t_oop->is_known_instance_field()) && | |
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1101 t_oop->offset() != Type::OffsetBot && |
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1102 t_oop->offset() != Type::OffsetTop) { |
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1103 return true; |
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1104 } |
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1105 } |
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1106 return false; |
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1107 } |
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1108 |
0 | 1109 //------------------------------Identity--------------------------------------- |
1110 // Loads are identity if previous store is to same address | |
1111 Node *LoadNode::Identity( PhaseTransform *phase ) { | |
1112 // If the previous store-maker is the right kind of Store, and the store is | |
1113 // to the same address, then we are equal to the value stored. | |
10278 | 1114 Node* mem = in(Memory); |
0 | 1115 Node* value = can_see_stored_value(mem, phase); |
1116 if( value ) { | |
1117 // byte, short & char stores truncate naturally. | |
1118 // A load has to load the truncated value which requires | |
1119 // some sort of masking operation and that requires an | |
1120 // Ideal call instead of an Identity call. | |
1121 if (memory_size() < BytesPerInt) { | |
1122 // If the input to the store does not fit with the load's result type, | |
1123 // it must be truncated via an Ideal call. | |
1124 if (!phase->type(value)->higher_equal(phase->type(this))) | |
1125 return this; | |
1126 } | |
1127 // (This works even when value is a Con, but LoadNode::Value | |
1128 // usually runs first, producing the singleton type of the Con.) | |
1129 return value; | |
1130 } | |
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1131 |
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1132 // Search for an existing data phi which was generated before for the same |
605 | 1133 // instance's field to avoid infinite generation of phis in a loop. |
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1134 Node *region = mem->in(0); |
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1135 if (is_instance_field_load_with_local_phi(region)) { |
10278 | 1136 const TypeOopPtr *addr_t = in(Address)->bottom_type()->isa_oopptr(); |
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1137 int this_index = phase->C->get_alias_index(addr_t); |
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1138 int this_offset = addr_t->offset(); |
10278 | 1139 int this_iid = addr_t->instance_id(); |
1140 if (!addr_t->is_known_instance() && | |
1141 addr_t->is_ptr_to_boxed_value()) { | |
1142 // Use _idx of address base (could be Phi node) for boxed values. | |
1143 intptr_t ignore = 0; | |
1144 Node* base = AddPNode::Ideal_base_and_offset(in(Address), phase, ignore); | |
1145 this_iid = base->_idx; | |
1146 } | |
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1147 const Type* this_type = bottom_type(); |
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1148 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
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1149 Node* phi = region->fast_out(i); |
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1150 if (phi->is_Phi() && phi != mem && |
10278 | 1151 phi->as_Phi()->is_same_inst_field(this_type, this_iid, this_index, this_offset)) { |
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1152 return phi; |
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1153 } |
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1154 } |
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1155 } |
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1156 |
0 | 1157 return this; |
1158 } | |
1159 | |
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1160 // We're loading from an object which has autobox behaviour. |
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1161 // If this object is result of a valueOf call we'll have a phi |
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1162 // merging a newly allocated object and a load from the cache. |
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1163 // We want to replace this load with the original incoming |
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1164 // argument to the valueOf call. |
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1165 Node* LoadNode::eliminate_autobox(PhaseGVN* phase) { |
10278 | 1166 assert(phase->C->eliminate_boxing(), "sanity"); |
1167 intptr_t ignore = 0; | |
1168 Node* base = AddPNode::Ideal_base_and_offset(in(Address), phase, ignore); | |
1169 if ((base == NULL) || base->is_Phi()) { | |
1170 // Push the loads from the phi that comes from valueOf up | |
1171 // through it to allow elimination of the loads and the recovery | |
1172 // of the original value. It is done in split_through_phi(). | |
1173 return NULL; | |
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1174 } else if (base->is_Load() || |
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1175 base->is_DecodeN() && base->in(1)->is_Load()) { |
10278 | 1176 // Eliminate the load of boxed value for integer types from the cache |
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1177 // array by deriving the value from the index into the array. |
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1178 // Capture the offset of the load and then reverse the computation. |
10278 | 1179 |
1180 // Get LoadN node which loads a boxing object from 'cache' array. | |
1181 if (base->is_DecodeN()) { | |
1182 base = base->in(1); | |
1183 } | |
1184 if (!base->in(Address)->is_AddP()) { | |
1185 return NULL; // Complex address | |
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1186 } |
10278 | 1187 AddPNode* address = base->in(Address)->as_AddP(); |
1188 Node* cache_base = address->in(AddPNode::Base); | |
1189 if ((cache_base != NULL) && cache_base->is_DecodeN()) { | |
1190 // Get ConP node which is static 'cache' field. | |
1191 cache_base = cache_base->in(1); | |
1192 } | |
1193 if ((cache_base != NULL) && cache_base->is_Con()) { | |
1194 const TypeAryPtr* base_type = cache_base->bottom_type()->isa_aryptr(); | |
1195 if ((base_type != NULL) && base_type->is_autobox_cache()) { | |
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1196 Node* elements[4]; |
10278 | 1197 int shift = exact_log2(type2aelembytes(T_OBJECT)); |
1198 int count = address->unpack_offsets(elements, ARRAY_SIZE(elements)); | |
1199 if ((count > 0) && elements[0]->is_Con() && | |
1200 ((count == 1) || | |
1201 (count == 2) && elements[1]->Opcode() == Op_LShiftX && | |
1202 elements[1]->in(2) == phase->intcon(shift))) { | |
1203 ciObjArray* array = base_type->const_oop()->as_obj_array(); | |
1204 // Fetch the box object cache[0] at the base of the array and get its value | |
1205 ciInstance* box = array->obj_at(0)->as_instance(); | |
1206 ciInstanceKlass* ik = box->klass()->as_instance_klass(); | |
1207 assert(ik->is_box_klass(), "sanity"); | |
1208 assert(ik->nof_nonstatic_fields() == 1, "change following code"); | |
1209 if (ik->nof_nonstatic_fields() == 1) { | |
1210 // This should be true nonstatic_field_at requires calling | |
1211 // nof_nonstatic_fields so check it anyway | |
1212 ciConstant c = box->field_value(ik->nonstatic_field_at(0)); | |
1213 BasicType bt = c.basic_type(); | |
1214 // Only integer types have boxing cache. | |
1215 assert(bt == T_BOOLEAN || bt == T_CHAR || | |
1216 bt == T_BYTE || bt == T_SHORT || | |
1217 bt == T_INT || bt == T_LONG, err_msg_res("wrong type = %s", type2name(bt))); | |
1218 jlong cache_low = (bt == T_LONG) ? c.as_long() : c.as_int(); | |
1219 if (cache_low != (int)cache_low) { | |
1220 return NULL; // should not happen since cache is array indexed by value | |
1221 } | |
1222 jlong offset = arrayOopDesc::base_offset_in_bytes(T_OBJECT) - (cache_low << shift); | |
1223 if (offset != (int)offset) { | |
1224 return NULL; // should not happen since cache is array indexed by value | |
1225 } | |
1226 // Add up all the offsets making of the address of the load | |
1227 Node* result = elements[0]; | |
1228 for (int i = 1; i < count; i++) { | |
1229 result = phase->transform(new (phase->C) AddXNode(result, elements[i])); | |
1230 } | |
1231 // Remove the constant offset from the address and then | |
1232 result = phase->transform(new (phase->C) AddXNode(result, phase->MakeConX(-(int)offset))); | |
1233 // remove the scaling of the offset to recover the original index. | |
1234 if (result->Opcode() == Op_LShiftX && result->in(2) == phase->intcon(shift)) { | |
1235 // Peel the shift off directly but wrap it in a dummy node | |
1236 // since Ideal can't return existing nodes | |
1237 result = new (phase->C) RShiftXNode(result->in(1), phase->intcon(0)); | |
1238 } else if (result->is_Add() && result->in(2)->is_Con() && | |
1239 result->in(1)->Opcode() == Op_LShiftX && | |
1240 result->in(1)->in(2) == phase->intcon(shift)) { | |
1241 // We can't do general optimization: ((X<<Z) + Y) >> Z ==> X + (Y>>Z) | |
1242 // but for boxing cache access we know that X<<Z will not overflow | |
1243 // (there is range check) so we do this optimizatrion by hand here. | |
1244 Node* add_con = new (phase->C) RShiftXNode(result->in(2), phase->intcon(shift)); | |
1245 result = new (phase->C) AddXNode(result->in(1)->in(1), phase->transform(add_con)); | |
1246 } else { | |
1247 result = new (phase->C) RShiftXNode(result, phase->intcon(shift)); | |
1248 } | |
1249 #ifdef _LP64 | |
1250 if (bt != T_LONG) { | |
1251 result = new (phase->C) ConvL2INode(phase->transform(result)); | |
1252 } | |
1253 #else | |
1254 if (bt == T_LONG) { | |
1255 result = new (phase->C) ConvI2LNode(phase->transform(result)); | |
1256 } | |
1257 #endif | |
1258 return result; | |
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1259 } |
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1260 } |
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1261 } |
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1262 } |
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1263 } |
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1264 return NULL; |
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1265 } |
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1266 |
10278 | 1267 static bool stable_phi(PhiNode* phi, PhaseGVN *phase) { |
1268 Node* region = phi->in(0); | |
163 | 1269 if (region == NULL) { |
10278 | 1270 return false; // Wait stable graph |
163 | 1271 } |
10278 | 1272 uint cnt = phi->req(); |
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1273 for (uint i = 1; i < cnt; i++) { |
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1274 Node* rc = region->in(i); |
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1275 if (rc == NULL || phase->type(rc) == Type::TOP) |
10278 | 1276 return false; // Wait stable graph |
1277 Node* in = phi->in(i); | |
1278 if (in == NULL || phase->type(in) == Type::TOP) | |
1279 return false; // Wait stable graph | |
1280 } | |
1281 return true; | |
1282 } | |
1283 //------------------------------split_through_phi------------------------------ | |
1284 // Split instance or boxed field load through Phi. | |
1285 Node *LoadNode::split_through_phi(PhaseGVN *phase) { | |
1286 Node* mem = in(Memory); | |
1287 Node* address = in(Address); | |
1288 const TypeOopPtr *t_oop = phase->type(address)->isa_oopptr(); | |
1289 | |
1290 assert((t_oop != NULL) && | |
1291 (t_oop->is_known_instance_field() || | |
1292 t_oop->is_ptr_to_boxed_value()), "invalide conditions"); | |
1293 | |
1294 Compile* C = phase->C; | |
1295 intptr_t ignore = 0; | |
1296 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); | |
1297 bool base_is_phi = (base != NULL) && base->is_Phi(); | |
1298 bool load_boxed_values = t_oop->is_ptr_to_boxed_value() && C->aggressive_unboxing() && | |
1299 (base != NULL) && (base == address->in(AddPNode::Base)) && | |
1300 phase->type(base)->higher_equal(TypePtr::NOTNULL); | |
1301 | |
1302 if (!((mem->is_Phi() || base_is_phi) && | |
1303 (load_boxed_values || t_oop->is_known_instance_field()))) { | |
1304 return NULL; // memory is not Phi | |
1305 } | |
1306 | |
1307 if (mem->is_Phi()) { | |
1308 if (!stable_phi(mem->as_Phi(), phase)) { | |
163 | 1309 return NULL; // Wait stable graph |
1310 } | |
10278 | 1311 uint cnt = mem->req(); |
1312 // Check for loop invariant memory. | |
1313 if (cnt == 3) { | |
1314 for (uint i = 1; i < cnt; i++) { | |
1315 Node* in = mem->in(i); | |
1316 Node* m = optimize_memory_chain(in, t_oop, this, phase); | |
1317 if (m == mem) { | |
1318 set_req(Memory, mem->in(cnt - i)); | |
1319 return this; // made change | |
1320 } | |
163 | 1321 } |
1322 } | |
1323 } | |
10278 | 1324 if (base_is_phi) { |
1325 if (!stable_phi(base->as_Phi(), phase)) { | |
1326 return NULL; // Wait stable graph | |
1327 } | |
1328 uint cnt = base->req(); | |
1329 // Check for loop invariant memory. | |
1330 if (cnt == 3) { | |
1331 for (uint i = 1; i < cnt; i++) { | |
1332 if (base->in(i) == base) { | |
1333 return NULL; // Wait stable graph | |
1334 } | |
1335 } | |
1336 } | |
1337 } | |
1338 | |
1339 bool load_boxed_phi = load_boxed_values && base_is_phi && (base->in(0) == mem->in(0)); | |
1340 | |
163 | 1341 // Split through Phi (see original code in loopopts.cpp). |
10278 | 1342 assert(C->have_alias_type(t_oop), "instance should have alias type"); |
163 | 1343 |
1344 // Do nothing here if Identity will find a value | |
1345 // (to avoid infinite chain of value phis generation). | |
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1346 if (!phase->eqv(this, this->Identity(phase))) |
163 | 1347 return NULL; |
1348 | |
10278 | 1349 // Select Region to split through. |
1350 Node* region; | |
1351 if (!base_is_phi) { | |
1352 assert(mem->is_Phi(), "sanity"); | |
1353 region = mem->in(0); | |
1354 // Skip if the region dominates some control edge of the address. | |
1355 if (!MemNode::all_controls_dominate(address, region)) | |
1356 return NULL; | |
1357 } else if (!mem->is_Phi()) { | |
1358 assert(base_is_phi, "sanity"); | |
1359 region = base->in(0); | |
1360 // Skip if the region dominates some control edge of the memory. | |
1361 if (!MemNode::all_controls_dominate(mem, region)) | |
1362 return NULL; | |
1363 } else if (base->in(0) != mem->in(0)) { | |
1364 assert(base_is_phi && mem->is_Phi(), "sanity"); | |
1365 if (MemNode::all_controls_dominate(mem, base->in(0))) { | |
1366 region = base->in(0); | |
1367 } else if (MemNode::all_controls_dominate(address, mem->in(0))) { | |
1368 region = mem->in(0); | |
1369 } else { | |
1370 return NULL; // complex graph | |
1371 } | |
1372 } else { | |
1373 assert(base->in(0) == mem->in(0), "sanity"); | |
1374 region = mem->in(0); | |
1375 } | |
163 | 1376 |
1377 const Type* this_type = this->bottom_type(); | |
10278 | 1378 int this_index = C->get_alias_index(t_oop); |
1379 int this_offset = t_oop->offset(); | |
1380 int this_iid = t_oop->instance_id(); | |
1381 if (!t_oop->is_known_instance() && load_boxed_values) { | |
1382 // Use _idx of address base for boxed values. | |
1383 this_iid = base->_idx; | |
1384 } | |
1385 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
1386 Node* phi = new (C) PhiNode(region, this_type, NULL, this_iid, this_index, this_offset); | |
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1387 for (uint i = 1; i < region->req(); i++) { |
10278 | 1388 Node* x; |
163 | 1389 Node* the_clone = NULL; |
10278 | 1390 if (region->in(i) == C->top()) { |
1391 x = C->top(); // Dead path? Use a dead data op | |
163 | 1392 } else { |
1393 x = this->clone(); // Else clone up the data op | |
1394 the_clone = x; // Remember for possible deletion. | |
1395 // Alter data node to use pre-phi inputs | |
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1396 if (this->in(0) == region) { |
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1397 x->set_req(0, region->in(i)); |
163 | 1398 } else { |
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1399 x->set_req(0, NULL); |
163 | 1400 } |
10278 | 1401 if (mem->is_Phi() && (mem->in(0) == region)) { |
1402 x->set_req(Memory, mem->in(i)); // Use pre-Phi input for the clone. | |
1403 } | |
1404 if (address->is_Phi() && address->in(0) == region) { | |
1405 x->set_req(Address, address->in(i)); // Use pre-Phi input for the clone | |
1406 } | |
1407 if (base_is_phi && (base->in(0) == region)) { | |
1408 Node* base_x = base->in(i); // Clone address for loads from boxed objects. | |
1409 Node* adr_x = phase->transform(new (C) AddPNode(base_x,base_x,address->in(AddPNode::Offset))); | |
1410 x->set_req(Address, adr_x); | |
163 | 1411 } |
1412 } | |
1413 // Check for a 'win' on some paths | |
1414 const Type *t = x->Value(igvn); | |
1415 | |
1416 bool singleton = t->singleton(); | |
1417 | |
1418 // See comments in PhaseIdealLoop::split_thru_phi(). | |
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1419 if (singleton && t == Type::TOP) { |
163 | 1420 singleton &= region->is_Loop() && (i != LoopNode::EntryControl); |
1421 } | |
1422 | |
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1423 if (singleton) { |
163 | 1424 x = igvn->makecon(t); |
1425 } else { | |
1426 // We now call Identity to try to simplify the cloned node. | |
1427 // Note that some Identity methods call phase->type(this). | |
1428 // Make sure that the type array is big enough for | |
1429 // our new node, even though we may throw the node away. | |
1430 // (This tweaking with igvn only works because x is a new node.) | |
1431 igvn->set_type(x, t); | |
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1432 // If x is a TypeNode, capture any more-precise type permanently into Node |
605 | 1433 // otherwise it will be not updated during igvn->transform since |
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1434 // igvn->type(x) is set to x->Value() already. |
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1435 x->raise_bottom_type(t); |
163 | 1436 Node *y = x->Identity(igvn); |
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1437 if (y != x) { |
163 | 1438 x = y; |
1439 } else { | |
10278 | 1440 y = igvn->hash_find_insert(x); |
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1441 if (y) { |
163 | 1442 x = y; |
1443 } else { | |
1444 // Else x is a new node we are keeping | |
1445 // We do not need register_new_node_with_optimizer | |
1446 // because set_type has already been called. | |
1447 igvn->_worklist.push(x); | |
1448 } | |
1449 } | |
1450 } | |
10278 | 1451 if (x != the_clone && the_clone != NULL) { |
163 | 1452 igvn->remove_dead_node(the_clone); |
10278 | 1453 } |
163 | 1454 phi->set_req(i, x); |
1455 } | |
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1456 // Record Phi |
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1457 igvn->register_new_node_with_optimizer(phi); |
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1458 return phi; |
163 | 1459 } |
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1460 |
0 | 1461 //------------------------------Ideal------------------------------------------ |
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1462 // If the load is from Field memory and the pointer is non-null, it might be possible to |
0 | 1463 // zero out the control input. |
1464 // If the offset is constant and the base is an object allocation, | |
1465 // try to hook me up to the exact initializing store. | |
1466 Node *LoadNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1467 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
1468 if (p) return (p == NodeSentinel) ? NULL : p; | |
1469 | |
1470 Node* ctrl = in(MemNode::Control); | |
1471 Node* address = in(MemNode::Address); | |
1472 | |
1473 // Skip up past a SafePoint control. Cannot do this for Stores because | |
1474 // pointer stores & cardmarks must stay on the same side of a SafePoint. | |
1475 if( ctrl != NULL && ctrl->Opcode() == Op_SafePoint && | |
1476 phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw ) { | |
1477 ctrl = ctrl->in(0); | |
1478 set_req(MemNode::Control,ctrl); | |
1479 } | |
1480 | |
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1481 intptr_t ignore = 0; |
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1482 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); |
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1483 if (base != NULL |
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1484 && phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw) { |
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1485 // Check for useless control edge in some common special cases |
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1486 if (in(MemNode::Control) != NULL |
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1487 && can_remove_control() |
0 | 1488 && phase->type(base)->higher_equal(TypePtr::NOTNULL) |
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1489 && all_controls_dominate(base, phase->C->start())) { |
0 | 1490 // A method-invariant, non-null address (constant or 'this' argument). |
1491 set_req(MemNode::Control, NULL); | |
1492 } | |
17
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1493 } |
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1494 |
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1495 Node* mem = in(MemNode::Memory); |
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1496 const TypePtr *addr_t = phase->type(address)->isa_ptr(); |
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1497 |
10278 | 1498 if (can_reshape && (addr_t != NULL)) { |
74
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1499 // try to optimize our memory input |
10278 | 1500 Node* opt_mem = MemNode::optimize_memory_chain(mem, addr_t, this, phase); |
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1501 if (opt_mem != mem) { |
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1502 set_req(MemNode::Memory, opt_mem); |
305 | 1503 if (phase->type( opt_mem ) == Type::TOP) return NULL; |
74
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1504 return this; |
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1505 } |
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1506 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); |
10278 | 1507 if ((t_oop != NULL) && |
1508 (t_oop->is_known_instance_field() || | |
1509 t_oop->is_ptr_to_boxed_value())) { | |
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1510 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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1511 if (igvn != NULL && igvn->_worklist.member(opt_mem)) { |
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1512 // Delay this transformation until memory Phi is processed. |
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1513 phase->is_IterGVN()->_worklist.push(this); |
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1514 return NULL; |
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1515 } |
163 | 1516 // Split instance field load through Phi. |
1517 Node* result = split_through_phi(phase); | |
1518 if (result != NULL) return result; | |
10278 | 1519 |
1520 if (t_oop->is_ptr_to_boxed_value()) { | |
1521 Node* result = eliminate_autobox(phase); | |
1522 if (result != NULL) return result; | |
1523 } | |
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1524 } |
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1525 } |
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1526 |
0 | 1527 // Check for prior store with a different base or offset; make Load |
1528 // independent. Skip through any number of them. Bail out if the stores | |
1529 // are in an endless dead cycle and report no progress. This is a key | |
1530 // transform for Reflection. However, if after skipping through the Stores | |
1531 // we can't then fold up against a prior store do NOT do the transform as | |
1532 // this amounts to using the 'Oracle' model of aliasing. It leaves the same | |
1533 // array memory alive twice: once for the hoisted Load and again after the | |
1534 // bypassed Store. This situation only works if EVERYBODY who does | |
1535 // anti-dependence work knows how to bypass. I.e. we need all | |
1536 // anti-dependence checks to ask the same Oracle. Right now, that Oracle is | |
1537 // the alias index stuff. So instead, peek through Stores and IFF we can | |
1538 // fold up, do so. | |
1539 Node* prev_mem = find_previous_store(phase); | |
1540 // Steps (a), (b): Walk past independent stores to find an exact match. | |
1541 if (prev_mem != NULL && prev_mem != in(MemNode::Memory)) { | |
1542 // (c) See if we can fold up on the spot, but don't fold up here. | |
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1543 // Fold-up might require truncation (for LoadB/LoadS/LoadUS) or |
0 | 1544 // just return a prior value, which is done by Identity calls. |
1545 if (can_see_stored_value(prev_mem, phase)) { | |
1546 // Make ready for step (d): | |
1547 set_req(MemNode::Memory, prev_mem); | |
1548 return this; | |
1549 } | |
1550 } | |
1551 | |
1552 return NULL; // No further progress | |
1553 } | |
1554 | |
1555 // Helper to recognize certain Klass fields which are invariant across | |
1556 // some group of array types (e.g., int[] or all T[] where T < Object). | |
1557 const Type* | |
1558 LoadNode::load_array_final_field(const TypeKlassPtr *tkls, | |
1559 ciKlass* klass) const { | |
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1560 if (tkls->offset() == in_bytes(Klass::modifier_flags_offset())) { |
0 | 1561 // The field is Klass::_modifier_flags. Return its (constant) value. |
1562 // (Folds up the 2nd indirection in aClassConstant.getModifiers().) | |
1563 assert(this->Opcode() == Op_LoadI, "must load an int from _modifier_flags"); | |
1564 return TypeInt::make(klass->modifier_flags()); | |
1565 } | |
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1566 if (tkls->offset() == in_bytes(Klass::access_flags_offset())) { |
0 | 1567 // The field is Klass::_access_flags. Return its (constant) value. |
1568 // (Folds up the 2nd indirection in Reflection.getClassAccessFlags(aClassConstant).) | |
1569 assert(this->Opcode() == Op_LoadI, "must load an int from _access_flags"); | |
1570 return TypeInt::make(klass->access_flags()); | |
1571 } | |
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1572 if (tkls->offset() == in_bytes(Klass::layout_helper_offset())) { |
0 | 1573 // The field is Klass::_layout_helper. Return its constant value if known. |
1574 assert(this->Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1575 return TypeInt::make(klass->layout_helper()); | |
1576 } | |
1577 | |
1578 // No match. | |
1579 return NULL; | |
1580 } | |
1581 | |
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1582 // Try to constant-fold a stable array element. |
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1583 static const Type* fold_stable_ary_elem(const TypeAryPtr* ary, int off, BasicType loadbt) { |
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1584 assert(ary->const_oop(), "array should be constant"); |
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1585 assert(ary->is_stable(), "array should be stable"); |
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1586 |
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1587 // Decode the results of GraphKit::array_element_address. |
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1588 ciArray* aobj = ary->const_oop()->as_array(); |
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1589 ciConstant con = aobj->element_value_by_offset(off); |
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1590 |
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1591 if (con.basic_type() != T_ILLEGAL && !con.is_null_or_zero()) { |
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1592 const Type* con_type = Type::make_from_constant(con); |
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1593 if (con_type != NULL) { |
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1594 if (con_type->isa_aryptr()) { |
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1595 // Join with the array element type, in case it is also stable. |
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1596 int dim = ary->stable_dimension(); |
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1597 con_type = con_type->is_aryptr()->cast_to_stable(true, dim-1); |
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1598 } |
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1599 if (loadbt == T_NARROWOOP && con_type->isa_oopptr()) { |
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1600 con_type = con_type->make_narrowoop(); |
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1601 } |
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1602 #ifndef PRODUCT |
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1603 if (TraceIterativeGVN) { |
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1604 tty->print("FoldStableValues: array element [off=%d]: con_type=", off); |
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1605 con_type->dump(); tty->cr(); |
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1606 } |
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1607 #endif //PRODUCT |
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1608 return con_type; |
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1609 } |
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1610 } |
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1611 return NULL; |
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1612 } |
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1613 |
0 | 1614 //------------------------------Value----------------------------------------- |
1615 const Type *LoadNode::Value( PhaseTransform *phase ) const { | |
1616 // Either input is TOP ==> the result is TOP | |
1617 Node* mem = in(MemNode::Memory); | |
1618 const Type *t1 = phase->type(mem); | |
1619 if (t1 == Type::TOP) return Type::TOP; | |
1620 Node* adr = in(MemNode::Address); | |
1621 const TypePtr* tp = phase->type(adr)->isa_ptr(); | |
1622 if (tp == NULL || tp->empty()) return Type::TOP; | |
1623 int off = tp->offset(); | |
1624 assert(off != Type::OffsetTop, "case covered by TypePtr::empty"); | |
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1625 Compile* C = phase->C; |
0 | 1626 |
1627 // Try to guess loaded type from pointer type | |
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1628 if (tp->isa_aryptr()) { |
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1629 const TypeAryPtr* ary = tp->is_aryptr(); |
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1630 const Type* t = ary->elem(); |
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1631 |
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1632 // Determine whether the reference is beyond the header or not, by comparing |
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1633 // the offset against the offset of the start of the array's data. |
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1634 // Different array types begin at slightly different offsets (12 vs. 16). |
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1635 // We choose T_BYTE as an example base type that is least restrictive |
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1636 // as to alignment, which will therefore produce the smallest |
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1637 // possible base offset. |
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1638 const int min_base_off = arrayOopDesc::base_offset_in_bytes(T_BYTE); |
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1639 const bool off_beyond_header = ((uint)off >= (uint)min_base_off); |
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1640 |
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1641 // Try to constant-fold a stable array element. |
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1642 if (FoldStableValues && ary->is_stable() && ary->const_oop() != NULL) { |
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1643 // Make sure the reference is not into the header and the offset is constant |
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|
1644 if (off_beyond_header && adr->is_AddP() && off != Type::OffsetBot) { |
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1645 const Type* con_type = fold_stable_ary_elem(ary, off, memory_type()); |
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1646 if (con_type != NULL) { |
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1647 return con_type; |
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1648 } |
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1649 } |
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1650 } |
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1651 |
0 | 1652 // Don't do this for integer types. There is only potential profit if |
1653 // the element type t is lower than _type; that is, for int types, if _type is | |
1654 // more restrictive than t. This only happens here if one is short and the other | |
1655 // char (both 16 bits), and in those cases we've made an intentional decision | |
1656 // to use one kind of load over the other. See AndINode::Ideal and 4965907. | |
1657 // Also, do not try to narrow the type for a LoadKlass, regardless of offset. | |
1658 // | |
1659 // Yes, it is possible to encounter an expression like (LoadKlass p1:(AddP x x 8)) | |
1660 // where the _gvn.type of the AddP is wider than 8. This occurs when an earlier | |
1661 // copy p0 of (AddP x x 8) has been proven equal to p1, and the p0 has been | |
1662 // subsumed by p1. If p1 is on the worklist but has not yet been re-transformed, | |
1663 // it is possible that p1 will have a type like Foo*[int+]:NotNull*+any. | |
1664 // In fact, that could have been the original type of p1, and p1 could have | |
1665 // had an original form like p1:(AddP x x (LShiftL quux 3)), where the | |
1666 // expression (LShiftL quux 3) independently optimized to the constant 8. | |
1667 if ((t->isa_int() == NULL) && (t->isa_long() == NULL) | |
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1668 && (_type->isa_vect() == NULL) |
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1669 && Opcode() != Op_LoadKlass && Opcode() != Op_LoadNKlass) { |
0 | 1670 // t might actually be lower than _type, if _type is a unique |
1671 // concrete subclass of abstract class t. | |
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1672 if (off_beyond_header) { // is the offset beyond the header? |
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1673 const Type* jt = t->join_speculative(_type); |
0 | 1674 // In any case, do not allow the join, per se, to empty out the type. |
1675 if (jt->empty() && !t->empty()) { | |
1676 // This can happen if a interface-typed array narrows to a class type. | |
1677 jt = _type; | |
1678 } | |
10278 | 1679 #ifdef ASSERT |
1680 if (phase->C->eliminate_boxing() && adr->is_AddP()) { | |
17
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1681 // The pointers in the autobox arrays are always non-null |
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1682 Node* base = adr->in(AddPNode::Base); |
10278 | 1683 if ((base != NULL) && base->is_DecodeN()) { |
1684 // Get LoadN node which loads IntegerCache.cache field | |
1685 base = base->in(1); | |
1686 } | |
1687 if ((base != NULL) && base->is_Con()) { | |
1688 const TypeAryPtr* base_type = base->bottom_type()->isa_aryptr(); | |
1689 if ((base_type != NULL) && base_type->is_autobox_cache()) { | |
1690 // It could be narrow oop | |
1691 assert(jt->make_ptr()->ptr() == TypePtr::NotNull,"sanity"); | |
17
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1692 } |
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1693 } |
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1694 } |
10278 | 1695 #endif |
0 | 1696 return jt; |
1697 } | |
1698 } | |
1699 } else if (tp->base() == Type::InstPtr) { | |
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1700 ciEnv* env = C->env(); |
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1701 const TypeInstPtr* tinst = tp->is_instptr(); |
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1702 ciKlass* klass = tinst->klass(); |
0 | 1703 assert( off != Type::OffsetBot || |
1704 // arrays can be cast to Objects | |
1705 tp->is_oopptr()->klass()->is_java_lang_Object() || | |
1706 // unsafe field access may not have a constant offset | |
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1707 C->has_unsafe_access(), |
0 | 1708 "Field accesses must be precise" ); |
1709 // For oop loads, we expect the _type to be precise | |
3902
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1710 if (klass == env->String_klass() && |
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1711 adr->is_AddP() && off != Type::OffsetBot) { |
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1712 // For constant Strings treat the final fields as compile time constants. |
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1713 Node* base = adr->in(AddPNode::Base); |
1766
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1714 const TypeOopPtr* t = phase->type(base)->isa_oopptr(); |
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1715 if (t != NULL && t->singleton()) { |
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1716 ciField* field = env->String_klass()->get_field_by_offset(off, false); |
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1717 if (field != NULL && field->is_final()) { |
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1718 ciObject* string = t->const_oop(); |
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1719 ciConstant constant = string->as_instance()->field_value(field); |
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1720 if (constant.basic_type() == T_INT) { |
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1721 return TypeInt::make(constant.as_int()); |
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1722 } else if (constant.basic_type() == T_ARRAY) { |
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1723 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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1724 return TypeNarrowOop::make_from_constant(constant.as_object(), true); |
2320
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1725 } else { |
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1726 return TypeOopPtr::make_from_constant(constant.as_object(), true); |
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1727 } |
1080
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1728 } |
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1729 } |
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1730 } |
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1731 } |
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1732 // Optimizations for constant objects |
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1733 ciObject* const_oop = tinst->const_oop(); |
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1734 if (const_oop != NULL) { |
10278 | 1735 // For constant Boxed value treat the target field as a compile time constant. |
1736 if (tinst->is_ptr_to_boxed_value()) { | |
1737 return tinst->get_const_boxed_value(); | |
1738 } else | |
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1739 // For constant CallSites treat the target field as a compile time constant. |
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1740 if (const_oop->is_call_site()) { |
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1741 ciCallSite* call_site = const_oop->as_call_site(); |
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1742 ciField* field = call_site->klass()->as_instance_klass()->get_field_by_offset(off, /*is_static=*/ false); |
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1743 if (field != NULL && field->is_call_site_target()) { |
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1744 ciMethodHandle* target = call_site->get_target(); |
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1745 if (target != NULL) { // just in case |
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1746 ciConstant constant(T_OBJECT, target); |
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1747 const Type* t; |
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1748 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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1749 t = TypeNarrowOop::make_from_constant(constant.as_object(), true); |
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1750 } else { |
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1751 t = TypeOopPtr::make_from_constant(constant.as_object(), true); |
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1752 } |
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1753 // Add a dependence for invalidation of the optimization. |
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1754 if (!call_site->is_constant_call_site()) { |
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1755 C->dependencies()->assert_call_site_target_value(call_site, target); |
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|
1756 } |
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|
1757 return t; |
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|
1758 } |
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|
1759 } |
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|
1760 } |
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|
1761 } |
0 | 1762 } else if (tp->base() == Type::KlassPtr) { |
1763 assert( off != Type::OffsetBot || | |
1764 // arrays can be cast to Objects | |
1765 tp->is_klassptr()->klass()->is_java_lang_Object() || | |
1766 // also allow array-loading from the primary supertype | |
1767 // array during subtype checks | |
1768 Opcode() == Op_LoadKlass, | |
1769 "Field accesses must be precise" ); | |
1770 // For klass/static loads, we expect the _type to be precise | |
1771 } | |
1772 | |
1773 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1774 if (tkls != NULL && !StressReflectiveCode) { | |
1775 ciKlass* klass = tkls->klass(); | |
1776 if (klass->is_loaded() && tkls->klass_is_exact()) { | |
1777 // We are loading a field from a Klass metaobject whose identity | |
1778 // is known at compile time (the type is "exact" or "precise"). | |
1779 // Check for fields we know are maintained as constants by the VM. | |
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1780 if (tkls->offset() == in_bytes(Klass::super_check_offset_offset())) { |
0 | 1781 // The field is Klass::_super_check_offset. Return its (constant) value. |
1782 // (Folds up type checking code.) | |
1783 assert(Opcode() == Op_LoadI, "must load an int from _super_check_offset"); | |
1784 return TypeInt::make(klass->super_check_offset()); | |
1785 } | |
1786 // Compute index into primary_supers array | |
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1787 juint depth = (tkls->offset() - in_bytes(Klass::primary_supers_offset())) / sizeof(Klass*); |
0 | 1788 // Check for overflowing; use unsigned compare to handle the negative case. |
1789 if( depth < ciKlass::primary_super_limit() ) { | |
1790 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1791 // (Folds up type checking code.) | |
1792 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1793 ciKlass *ss = klass->super_of_depth(depth); | |
1794 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1795 } | |
1796 const Type* aift = load_array_final_field(tkls, klass); | |
1797 if (aift != NULL) return aift; | |
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1798 if (tkls->offset() == in_bytes(ArrayKlass::component_mirror_offset()) |
0 | 1799 && klass->is_array_klass()) { |
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1800 // The field is ArrayKlass::_component_mirror. Return its (constant) value. |
0 | 1801 // (Folds up aClassConstant.getComponentType, common in Arrays.copyOf.) |
1802 assert(Opcode() == Op_LoadP, "must load an oop from _component_mirror"); | |
1803 return TypeInstPtr::make(klass->as_array_klass()->component_mirror()); | |
1804 } | |
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1805 if (tkls->offset() == in_bytes(Klass::java_mirror_offset())) { |
0 | 1806 // The field is Klass::_java_mirror. Return its (constant) value. |
1807 // (Folds up the 2nd indirection in anObjConstant.getClass().) | |
1808 assert(Opcode() == Op_LoadP, "must load an oop from _java_mirror"); | |
1809 return TypeInstPtr::make(klass->java_mirror()); | |
1810 } | |
1811 } | |
1812 | |
1813 // We can still check if we are loading from the primary_supers array at a | |
1814 // shallow enough depth. Even though the klass is not exact, entries less | |
1815 // than or equal to its super depth are correct. | |
1816 if (klass->is_loaded() ) { | |
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1817 ciType *inner = klass; |
0 | 1818 while( inner->is_obj_array_klass() ) |
1819 inner = inner->as_obj_array_klass()->base_element_type(); | |
1820 if( inner->is_instance_klass() && | |
1821 !inner->as_instance_klass()->flags().is_interface() ) { | |
1822 // Compute index into primary_supers array | |
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1823 juint depth = (tkls->offset() - in_bytes(Klass::primary_supers_offset())) / sizeof(Klass*); |
0 | 1824 // Check for overflowing; use unsigned compare to handle the negative case. |
1825 if( depth < ciKlass::primary_super_limit() && | |
1826 depth <= klass->super_depth() ) { // allow self-depth checks to handle self-check case | |
1827 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1828 // (Folds up type checking code.) | |
1829 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1830 ciKlass *ss = klass->super_of_depth(depth); | |
1831 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1832 } | |
1833 } | |
1834 } | |
1835 | |
1836 // If the type is enough to determine that the thing is not an array, | |
1837 // we can give the layout_helper a positive interval type. | |
1838 // This will help short-circuit some reflective code. | |
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1839 if (tkls->offset() == in_bytes(Klass::layout_helper_offset()) |
0 | 1840 && !klass->is_array_klass() // not directly typed as an array |
1841 && !klass->is_interface() // specifically not Serializable & Cloneable | |
1842 && !klass->is_java_lang_Object() // not the supertype of all T[] | |
1843 ) { | |
1844 // Note: When interfaces are reliable, we can narrow the interface | |
1845 // test to (klass != Serializable && klass != Cloneable). | |
1846 assert(Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1847 jint min_size = Klass::instance_layout_helper(oopDesc::header_size(), false); | |
1848 // The key property of this type is that it folds up tests | |
1849 // for array-ness, since it proves that the layout_helper is positive. | |
1850 // Thus, a generic value like the basic object layout helper works fine. | |
1851 return TypeInt::make(min_size, max_jint, Type::WidenMin); | |
1852 } | |
1853 } | |
1854 | |
1855 // If we are loading from a freshly-allocated object, produce a zero, | |
1856 // if the load is provably beyond the header of the object. | |
1857 // (Also allow a variable load from a fresh array to produce zero.) | |
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1858 const TypeOopPtr *tinst = tp->isa_oopptr(); |
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1859 bool is_instance = (tinst != NULL) && tinst->is_known_instance_field(); |
10278 | 1860 bool is_boxed_value = (tinst != NULL) && tinst->is_ptr_to_boxed_value(); |
1861 if (ReduceFieldZeroing || is_instance || is_boxed_value) { | |
0 | 1862 Node* value = can_see_stored_value(mem,phase); |
4815 | 1863 if (value != NULL && value->is_Con()) { |
1864 assert(value->bottom_type()->higher_equal(_type),"sanity"); | |
0 | 1865 return value->bottom_type(); |
4815 | 1866 } |
0 | 1867 } |
1868 | |
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1869 if (is_instance) { |
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1870 // If we have an instance type and our memory input is the |
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1871 // programs's initial memory state, there is no matching store, |
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1872 // so just return a zero of the appropriate type |
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1873 Node *mem = in(MemNode::Memory); |
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1874 if (mem->is_Parm() && mem->in(0)->is_Start()) { |
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1875 assert(mem->as_Parm()->_con == TypeFunc::Memory, "must be memory Parm"); |
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1876 return Type::get_zero_type(_type->basic_type()); |
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1877 } |
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1878 } |
0 | 1879 return _type; |
1880 } | |
1881 | |
1882 //------------------------------match_edge------------------------------------- | |
1883 // Do we Match on this edge index or not? Match only the address. | |
1884 uint LoadNode::match_edge(uint idx) const { | |
1885 return idx == MemNode::Address; | |
1886 } | |
1887 | |
1888 //--------------------------LoadBNode::Ideal-------------------------------------- | |
1889 // | |
1890 // If the previous store is to the same address as this load, | |
1891 // and the value stored was larger than a byte, replace this load | |
1892 // with the value stored truncated to a byte. If no truncation is | |
1893 // needed, the replacement is done in LoadNode::Identity(). | |
1894 // | |
1895 Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1896 Node* mem = in(MemNode::Memory); | |
1897 Node* value = can_see_stored_value(mem,phase); | |
1898 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
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1899 Node *result = phase->transform( new (phase->C) LShiftINode(value, phase->intcon(24)) ); |
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1900 return new (phase->C) RShiftINode(result, phase->intcon(24)); |
0 | 1901 } |
1902 // Identity call will handle the case where truncation is not needed. | |
1903 return LoadNode::Ideal(phase, can_reshape); | |
1904 } | |
1905 | |
4815 | 1906 const Type* LoadBNode::Value(PhaseTransform *phase) const { |
1907 Node* mem = in(MemNode::Memory); | |
1908 Node* value = can_see_stored_value(mem,phase); | |
4821 | 1909 if (value != NULL && value->is_Con() && |
1910 !value->bottom_type()->higher_equal(_type)) { | |
4815 | 1911 // If the input to the store does not fit with the load's result type, |
1912 // it must be truncated. We can't delay until Ideal call since | |
1913 // a singleton Value is needed for split_thru_phi optimization. | |
1914 int con = value->get_int(); | |
1915 return TypeInt::make((con << 24) >> 24); | |
1916 } | |
1917 return LoadNode::Value(phase); | |
1918 } | |
1919 | |
624 | 1920 //--------------------------LoadUBNode::Ideal------------------------------------- |
1921 // | |
1922 // If the previous store is to the same address as this load, | |
1923 // and the value stored was larger than a byte, replace this load | |
1924 // with the value stored truncated to a byte. If no truncation is | |
1925 // needed, the replacement is done in LoadNode::Identity(). | |
1926 // | |
1927 Node* LoadUBNode::Ideal(PhaseGVN* phase, bool can_reshape) { | |
1928 Node* mem = in(MemNode::Memory); | |
1929 Node* value = can_see_stored_value(mem, phase); | |
1930 if (value && !phase->type(value)->higher_equal(_type)) | |
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1931 return new (phase->C) AndINode(value, phase->intcon(0xFF)); |
624 | 1932 // Identity call will handle the case where truncation is not needed. |
1933 return LoadNode::Ideal(phase, can_reshape); | |
1934 } | |
1935 | |
4815 | 1936 const Type* LoadUBNode::Value(PhaseTransform *phase) const { |
1937 Node* mem = in(MemNode::Memory); | |
1938 Node* value = can_see_stored_value(mem,phase); | |
4821 | 1939 if (value != NULL && value->is_Con() && |
1940 !value->bottom_type()->higher_equal(_type)) { | |
4815 | 1941 // If the input to the store does not fit with the load's result type, |
1942 // it must be truncated. We can't delay until Ideal call since | |
1943 // a singleton Value is needed for split_thru_phi optimization. | |
1944 int con = value->get_int(); | |
1945 return TypeInt::make(con & 0xFF); | |
1946 } | |
1947 return LoadNode::Value(phase); | |
1948 } | |
1949 | |
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1950 //--------------------------LoadUSNode::Ideal------------------------------------- |
0 | 1951 // |
1952 // If the previous store is to the same address as this load, | |
1953 // and the value stored was larger than a char, replace this load | |
1954 // with the value stored truncated to a char. If no truncation is | |
1955 // needed, the replacement is done in LoadNode::Identity(). | |
1956 // | |
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1957 Node *LoadUSNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
0 | 1958 Node* mem = in(MemNode::Memory); |
1959 Node* value = can_see_stored_value(mem,phase); | |
1960 if( value && !phase->type(value)->higher_equal( _type ) ) | |
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1961 return new (phase->C) AndINode(value,phase->intcon(0xFFFF)); |
0 | 1962 // Identity call will handle the case where truncation is not needed. |
1963 return LoadNode::Ideal(phase, can_reshape); | |
1964 } | |
1965 | |
4815 | 1966 const Type* LoadUSNode::Value(PhaseTransform *phase) const { |
1967 Node* mem = in(MemNode::Memory); | |
1968 Node* value = can_see_stored_value(mem,phase); | |
4821 | 1969 if (value != NULL && value->is_Con() && |
1970 !value->bottom_type()->higher_equal(_type)) { | |
4815 | 1971 // If the input to the store does not fit with the load's result type, |
1972 // it must be truncated. We can't delay until Ideal call since | |
1973 // a singleton Value is needed for split_thru_phi optimization. | |
1974 int con = value->get_int(); | |
1975 return TypeInt::make(con & 0xFFFF); | |
1976 } | |
1977 return LoadNode::Value(phase); | |
1978 } | |
1979 | |
0 | 1980 //--------------------------LoadSNode::Ideal-------------------------------------- |
1981 // | |
1982 // If the previous store is to the same address as this load, | |
1983 // and the value stored was larger than a short, replace this load | |
1984 // with the value stored truncated to a short. If no truncation is | |
1985 // needed, the replacement is done in LoadNode::Identity(). | |
1986 // | |
1987 Node *LoadSNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1988 Node* mem = in(MemNode::Memory); | |
1989 Node* value = can_see_stored_value(mem,phase); | |
1990 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
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1991 Node *result = phase->transform( new (phase->C) LShiftINode(value, phase->intcon(16)) ); |
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1992 return new (phase->C) RShiftINode(result, phase->intcon(16)); |
0 | 1993 } |
1994 // Identity call will handle the case where truncation is not needed. | |
1995 return LoadNode::Ideal(phase, can_reshape); | |
1996 } | |
1997 | |
4815 | 1998 const Type* LoadSNode::Value(PhaseTransform *phase) const { |
1999 Node* mem = in(MemNode::Memory); | |
2000 Node* value = can_see_stored_value(mem,phase); | |
4821 | 2001 if (value != NULL && value->is_Con() && |
2002 !value->bottom_type()->higher_equal(_type)) { | |
4815 | 2003 // If the input to the store does not fit with the load's result type, |
2004 // it must be truncated. We can't delay until Ideal call since | |
2005 // a singleton Value is needed for split_thru_phi optimization. | |
2006 int con = value->get_int(); | |
2007 return TypeInt::make((con << 16) >> 16); | |
2008 } | |
2009 return LoadNode::Value(phase); | |
2010 } | |
2011 | |
0 | 2012 //============================================================================= |
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2013 //----------------------------LoadKlassNode::make------------------------------ |
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2014 // Polymorphic factory method: |
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2015 Node* LoadKlassNode::make(PhaseGVN& gvn, Node* ctl, Node *mem, Node *adr, const TypePtr* at, const TypeKlassPtr *tk) { |
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2016 Compile* C = gvn.C; |
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2017 // sanity check the alias category against the created node type |
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2018 const TypePtr *adr_type = adr->bottom_type()->isa_ptr(); |
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2019 assert(adr_type != NULL, "expecting TypeKlassPtr"); |
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2020 #ifdef _LP64 |
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2021 if (adr_type->is_ptr_to_narrowklass()) { |
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2022 assert(UseCompressedClassPointers, "no compressed klasses"); |
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2023 Node* load_klass = gvn.transform(new (C) LoadNKlassNode(ctl, mem, adr, at, tk->make_narrowklass(), MemNode::unordered)); |
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2024 return new (C) DecodeNKlassNode(load_klass, load_klass->bottom_type()->make_ptr()); |
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2025 } |
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2026 #endif |
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2027 assert(!adr_type->is_ptr_to_narrowklass() && !adr_type->is_ptr_to_narrowoop(), "should have got back a narrow oop"); |
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2028 return new (C) LoadKlassNode(ctl, mem, adr, at, tk, MemNode::unordered); |
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2029 } |
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2030 |
0 | 2031 //------------------------------Value------------------------------------------ |
2032 const Type *LoadKlassNode::Value( PhaseTransform *phase ) const { | |
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2033 return klass_value_common(phase); |
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2034 } |
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2035 |
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2036 // In most cases, LoadKlassNode does not have the control input set. If the control |
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2037 // input is set, it must not be removed (by LoadNode::Ideal()). |
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2038 bool LoadKlassNode::can_remove_control() const { |
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2039 return false; |
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2040 } |
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2041 |
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2042 const Type *LoadNode::klass_value_common( PhaseTransform *phase ) const { |
0 | 2043 // Either input is TOP ==> the result is TOP |
2044 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2045 if (t1 == Type::TOP) return Type::TOP; | |
2046 Node *adr = in(MemNode::Address); | |
2047 const Type *t2 = phase->type( adr ); | |
2048 if (t2 == Type::TOP) return Type::TOP; | |
2049 const TypePtr *tp = t2->is_ptr(); | |
2050 if (TypePtr::above_centerline(tp->ptr()) || | |
2051 tp->ptr() == TypePtr::Null) return Type::TOP; | |
2052 | |
2053 // Return a more precise klass, if possible | |
2054 const TypeInstPtr *tinst = tp->isa_instptr(); | |
2055 if (tinst != NULL) { | |
2056 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
2057 int offset = tinst->offset(); | |
2058 if (ik == phase->C->env()->Class_klass() | |
2059 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
2060 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
2061 // We are loading a special hidden field from a Class mirror object, | |
2062 // the field which points to the VM's Klass metaobject. | |
2063 ciType* t = tinst->java_mirror_type(); | |
2064 // java_mirror_type returns non-null for compile-time Class constants. | |
2065 if (t != NULL) { | |
2066 // constant oop => constant klass | |
2067 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
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2068 if (t->is_void()) { |
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2069 // We cannot create a void array. Since void is a primitive type return null |
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2070 // klass. Users of this result need to do a null check on the returned klass. |
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2071 return TypePtr::NULL_PTR; |
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2072 } |
0 | 2073 return TypeKlassPtr::make(ciArrayKlass::make(t)); |
2074 } | |
2075 if (!t->is_klass()) { | |
2076 // a primitive Class (e.g., int.class) has NULL for a klass field | |
2077 return TypePtr::NULL_PTR; | |
2078 } | |
2079 // (Folds up the 1st indirection in aClassConstant.getModifiers().) | |
2080 return TypeKlassPtr::make(t->as_klass()); | |
2081 } | |
2082 // non-constant mirror, so we can't tell what's going on | |
2083 } | |
2084 if( !ik->is_loaded() ) | |
2085 return _type; // Bail out if not loaded | |
2086 if (offset == oopDesc::klass_offset_in_bytes()) { | |
2087 if (tinst->klass_is_exact()) { | |
2088 return TypeKlassPtr::make(ik); | |
2089 } | |
2090 // See if we can become precise: no subklasses and no interface | |
2091 // (Note: We need to support verified interfaces.) | |
2092 if (!ik->is_interface() && !ik->has_subklass()) { | |
2093 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
2094 // Add a dependence; if any subclass added we need to recompile | |
2095 if (!ik->is_final()) { | |
2096 // %%% should use stronger assert_unique_concrete_subtype instead | |
2097 phase->C->dependencies()->assert_leaf_type(ik); | |
2098 } | |
2099 // Return precise klass | |
2100 return TypeKlassPtr::make(ik); | |
2101 } | |
2102 | |
2103 // Return root of possible klass | |
2104 return TypeKlassPtr::make(TypePtr::NotNull, ik, 0/*offset*/); | |
2105 } | |
2106 } | |
2107 | |
2108 // Check for loading klass from an array | |
2109 const TypeAryPtr *tary = tp->isa_aryptr(); | |
2110 if( tary != NULL ) { | |
2111 ciKlass *tary_klass = tary->klass(); | |
2112 if (tary_klass != NULL // can be NULL when at BOTTOM or TOP | |
2113 && tary->offset() == oopDesc::klass_offset_in_bytes()) { | |
2114 if (tary->klass_is_exact()) { | |
2115 return TypeKlassPtr::make(tary_klass); | |
2116 } | |
2117 ciArrayKlass *ak = tary->klass()->as_array_klass(); | |
2118 // If the klass is an object array, we defer the question to the | |
2119 // array component klass. | |
2120 if( ak->is_obj_array_klass() ) { | |
2121 assert( ak->is_loaded(), "" ); | |
2122 ciKlass *base_k = ak->as_obj_array_klass()->base_element_klass(); | |
2123 if( base_k->is_loaded() && base_k->is_instance_klass() ) { | |
2124 ciInstanceKlass* ik = base_k->as_instance_klass(); | |
2125 // See if we can become precise: no subklasses and no interface | |
2126 if (!ik->is_interface() && !ik->has_subklass()) { | |
2127 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
2128 // Add a dependence; if any subclass added we need to recompile | |
2129 if (!ik->is_final()) { | |
2130 phase->C->dependencies()->assert_leaf_type(ik); | |
2131 } | |
2132 // Return precise array klass | |
2133 return TypeKlassPtr::make(ak); | |
2134 } | |
2135 } | |
2136 return TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
2137 } else { // Found a type-array? | |
2138 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
2139 assert( ak->is_type_array_klass(), "" ); | |
2140 return TypeKlassPtr::make(ak); // These are always precise | |
2141 } | |
2142 } | |
2143 } | |
2144 | |
2145 // Check for loading klass from an array klass | |
2146 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
2147 if (tkls != NULL && !StressReflectiveCode) { | |
2148 ciKlass* klass = tkls->klass(); | |
2149 if( !klass->is_loaded() ) | |
2150 return _type; // Bail out if not loaded | |
2151 if( klass->is_obj_array_klass() && | |
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2152 tkls->offset() == in_bytes(ObjArrayKlass::element_klass_offset())) { |
0 | 2153 ciKlass* elem = klass->as_obj_array_klass()->element_klass(); |
2154 // // Always returning precise element type is incorrect, | |
2155 // // e.g., element type could be object and array may contain strings | |
2156 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0); | |
2157 | |
2158 // The array's TypeKlassPtr was declared 'precise' or 'not precise' | |
2159 // according to the element type's subclassing. | |
2160 return TypeKlassPtr::make(tkls->ptr(), elem, 0/*offset*/); | |
2161 } | |
2162 if( klass->is_instance_klass() && tkls->klass_is_exact() && | |
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2163 tkls->offset() == in_bytes(Klass::super_offset())) { |
0 | 2164 ciKlass* sup = klass->as_instance_klass()->super(); |
2165 // The field is Klass::_super. Return its (constant) value. | |
2166 // (Folds up the 2nd indirection in aClassConstant.getSuperClass().) | |
2167 return sup ? TypeKlassPtr::make(sup) : TypePtr::NULL_PTR; | |
2168 } | |
2169 } | |
2170 | |
2171 // Bailout case | |
2172 return LoadNode::Value(phase); | |
2173 } | |
2174 | |
2175 //------------------------------Identity--------------------------------------- | |
2176 // To clean up reflective code, simplify k.java_mirror.as_klass to plain k. | |
2177 // Also feed through the klass in Allocate(...klass...)._klass. | |
2178 Node* LoadKlassNode::Identity( PhaseTransform *phase ) { | |
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2179 return klass_identity_common(phase); |
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2180 } |
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2181 |
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2182 Node* LoadNode::klass_identity_common(PhaseTransform *phase ) { |
0 | 2183 Node* x = LoadNode::Identity(phase); |
2184 if (x != this) return x; | |
2185 | |
2186 // Take apart the address into an oop and and offset. | |
2187 // Return 'this' if we cannot. | |
2188 Node* adr = in(MemNode::Address); | |
2189 intptr_t offset = 0; | |
2190 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
2191 if (base == NULL) return this; | |
2192 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr(); | |
2193 if (toop == NULL) return this; | |
2194 | |
2195 // We can fetch the klass directly through an AllocateNode. | |
2196 // This works even if the klass is not constant (clone or newArray). | |
2197 if (offset == oopDesc::klass_offset_in_bytes()) { | |
2198 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase); | |
2199 if (allocated_klass != NULL) { | |
2200 return allocated_klass; | |
2201 } | |
2202 } | |
2203 | |
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2204 // Simplify k.java_mirror.as_klass to plain k, where k is a Klass*. |
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2205 // Simplify ak.component_mirror.array_klass to plain ak, ak an ArrayKlass. |
0 | 2206 // See inline_native_Class_query for occurrences of these patterns. |
2207 // Java Example: x.getClass().isAssignableFrom(y) | |
2208 // Java Example: Array.newInstance(x.getClass().getComponentType(), n) | |
2209 // | |
2210 // This improves reflective code, often making the Class | |
2211 // mirror go completely dead. (Current exception: Class | |
2212 // mirrors may appear in debug info, but we could clean them out by | |
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2213 // introducing a new debug info operator for Klass*.java_mirror). |
0 | 2214 if (toop->isa_instptr() && toop->klass() == phase->C->env()->Class_klass() |
2215 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
2216 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
2217 // We are loading a special hidden field from a Class mirror, | |
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2218 // the field which points to its Klass or ArrayKlass metaobject. |
0 | 2219 if (base->is_Load()) { |
2220 Node* adr2 = base->in(MemNode::Address); | |
2221 const TypeKlassPtr* tkls = phase->type(adr2)->isa_klassptr(); | |
2222 if (tkls != NULL && !tkls->empty() | |
2223 && (tkls->klass()->is_instance_klass() || | |
2224 tkls->klass()->is_array_klass()) | |
2225 && adr2->is_AddP() | |
2226 ) { | |
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2227 int mirror_field = in_bytes(Klass::java_mirror_offset()); |
0 | 2228 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { |
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2229 mirror_field = in_bytes(ArrayKlass::component_mirror_offset()); |
0 | 2230 } |
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2231 if (tkls->offset() == mirror_field) { |
0 | 2232 return adr2->in(AddPNode::Base); |
2233 } | |
2234 } | |
2235 } | |
2236 } | |
2237 | |
2238 return this; | |
2239 } | |
2240 | |
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2241 |
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2242 //------------------------------Value------------------------------------------ |
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2243 const Type *LoadNKlassNode::Value( PhaseTransform *phase ) const { |
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2244 const Type *t = klass_value_common(phase); |
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2245 if (t == Type::TOP) |
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2246 return t; |
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2247 |
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2248 return t->make_narrowklass(); |
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2249 } |
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2250 |
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2251 //------------------------------Identity--------------------------------------- |
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2252 // To clean up reflective code, simplify k.java_mirror.as_klass to narrow k. |
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2253 // Also feed through the klass in Allocate(...klass...)._klass. |
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2254 Node* LoadNKlassNode::Identity( PhaseTransform *phase ) { |
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2255 Node *x = klass_identity_common(phase); |
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2256 |
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2257 const Type *t = phase->type( x ); |
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2258 if( t == Type::TOP ) return x; |
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2259 if( t->isa_narrowklass()) return x; |
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2260 assert (!t->isa_narrowoop(), "no narrow oop here"); |
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2261 |
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2262 return phase->transform(new (phase->C) EncodePKlassNode(x, t->make_narrowklass())); |
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2263 } |
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2264 |
0 | 2265 //------------------------------Value----------------------------------------- |
2266 const Type *LoadRangeNode::Value( PhaseTransform *phase ) const { | |
2267 // Either input is TOP ==> the result is TOP | |
2268 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2269 if( t1 == Type::TOP ) return Type::TOP; | |
2270 Node *adr = in(MemNode::Address); | |
2271 const Type *t2 = phase->type( adr ); | |
2272 if( t2 == Type::TOP ) return Type::TOP; | |
2273 const TypePtr *tp = t2->is_ptr(); | |
2274 if (TypePtr::above_centerline(tp->ptr())) return Type::TOP; | |
2275 const TypeAryPtr *tap = tp->isa_aryptr(); | |
2276 if( !tap ) return _type; | |
2277 return tap->size(); | |
2278 } | |
2279 | |
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2280 //-------------------------------Ideal--------------------------------------- |
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2281 // Feed through the length in AllocateArray(...length...)._length. |
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2282 Node *LoadRangeNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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2283 Node* p = MemNode::Ideal_common(phase, can_reshape); |
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2284 if (p) return (p == NodeSentinel) ? NULL : p; |
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2285 |
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2286 // Take apart the address into an oop and and offset. |
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2287 // Return 'this' if we cannot. |
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2288 Node* adr = in(MemNode::Address); |
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2289 intptr_t offset = 0; |
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2290 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); |
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2291 if (base == NULL) return NULL; |
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2292 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); |
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2293 if (tary == NULL) return NULL; |
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2294 |
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2295 // We can fetch the length directly through an AllocateArrayNode. |
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2296 // This works even if the length is not constant (clone or newArray). |
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2297 if (offset == arrayOopDesc::length_offset_in_bytes()) { |
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2298 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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2299 if (alloc != NULL) { |
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2300 Node* allocated_length = alloc->Ideal_length(); |
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2301 Node* len = alloc->make_ideal_length(tary, phase); |
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2302 if (allocated_length != len) { |
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2303 // New CastII improves on this. |
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2304 return len; |
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2305 } |
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2306 } |
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2307 } |
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2308 |
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2309 return NULL; |
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2310 } |
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2311 |
0 | 2312 //------------------------------Identity--------------------------------------- |
2313 // Feed through the length in AllocateArray(...length...)._length. | |
2314 Node* LoadRangeNode::Identity( PhaseTransform *phase ) { | |
2315 Node* x = LoadINode::Identity(phase); | |
2316 if (x != this) return x; | |
2317 | |
2318 // Take apart the address into an oop and and offset. | |
2319 // Return 'this' if we cannot. | |
2320 Node* adr = in(MemNode::Address); | |
2321 intptr_t offset = 0; | |
2322 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
2323 if (base == NULL) return this; | |
2324 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); | |
2325 if (tary == NULL) return this; | |
2326 | |
2327 // We can fetch the length directly through an AllocateArrayNode. | |
2328 // This works even if the length is not constant (clone or newArray). | |
2329 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
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2330 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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2331 if (alloc != NULL) { |
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2332 Node* allocated_length = alloc->Ideal_length(); |
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2333 // Do not allow make_ideal_length to allocate a CastII node. |
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2334 Node* len = alloc->make_ideal_length(tary, phase, false); |
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2335 if (allocated_length == len) { |
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2336 // Return allocated_length only if it would not be improved by a CastII. |
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2337 return allocated_length; |
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2338 } |
0 | 2339 } |
2340 } | |
2341 | |
2342 return this; | |
2343 | |
2344 } | |
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2345 |
0 | 2346 //============================================================================= |
2347 //---------------------------StoreNode::make----------------------------------- | |
2348 // Polymorphic factory method: | |
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2349 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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2350 assert((mo == unordered || mo == release), "unexpected"); |
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2351 Compile* C = gvn.C; |
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2352 assert(C->get_alias_index(adr_type) != Compile::AliasIdxRaw || |
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2353 ctl != NULL, "raw memory operations should have control edge"); |
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2354 |
0 | 2355 switch (bt) { |
2356 case T_BOOLEAN: | |
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2357 case T_BYTE: return new (C) StoreBNode(ctl, mem, adr, adr_type, val, mo); |
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2358 case T_INT: return new (C) StoreINode(ctl, mem, adr, adr_type, val, mo); |
0 | 2359 case T_CHAR: |
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2360 case T_SHORT: return new (C) StoreCNode(ctl, mem, adr, adr_type, val, mo); |
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2361 case T_LONG: return new (C) StoreLNode(ctl, mem, adr, adr_type, val, mo); |
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2362 case T_FLOAT: return new (C) StoreFNode(ctl, mem, adr, adr_type, val, mo); |
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2363 case T_DOUBLE: return new (C) StoreDNode(ctl, mem, adr, adr_type, val, mo); |
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2364 case T_METADATA: |
0 | 2365 case T_ADDRESS: |
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2366 case T_OBJECT: |
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2367 #ifdef _LP64 |
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2368 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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2369 val = gvn.transform(new (C) EncodePNode(val, val->bottom_type()->make_narrowoop())); |
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2370 return new (C) StoreNNode(ctl, mem, adr, adr_type, val, mo); |
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2371 } else if (adr->bottom_type()->is_ptr_to_narrowklass() || |
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2372 (UseCompressedClassPointers && val->bottom_type()->isa_klassptr() && |
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2373 adr->bottom_type()->isa_rawptr())) { |
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2374 val = gvn.transform(new (C) EncodePKlassNode(val, val->bottom_type()->make_narrowklass())); |
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2375 return new (C) StoreNKlassNode(ctl, mem, adr, adr_type, val, mo); |
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2376 } |
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2377 #endif |
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2378 { |
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2379 return new (C) StorePNode(ctl, mem, adr, adr_type, val, mo); |
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2380 } |
0 | 2381 } |
2382 ShouldNotReachHere(); | |
2383 return (StoreNode*)NULL; | |
2384 } | |
2385 | |
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2386 StoreLNode* StoreLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, MemOrd mo) { |
0 | 2387 bool require_atomic = true; |
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2388 return new (C) StoreLNode(ctl, mem, adr, adr_type, val, mo, require_atomic); |
0 | 2389 } |
2390 | |
2391 | |
2392 //--------------------------bottom_type---------------------------------------- | |
2393 const Type *StoreNode::bottom_type() const { | |
2394 return Type::MEMORY; | |
2395 } | |
2396 | |
2397 //------------------------------hash------------------------------------------- | |
2398 uint StoreNode::hash() const { | |
2399 // unroll addition of interesting fields | |
2400 //return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address) + (uintptr_t)in(ValueIn); | |
2401 | |
2402 // Since they are not commoned, do not hash them: | |
2403 return NO_HASH; | |
2404 } | |
2405 | |
2406 //------------------------------Ideal------------------------------------------ | |
2407 // Change back-to-back Store(, p, x) -> Store(m, p, y) to Store(m, p, x). | |
2408 // When a store immediately follows a relevant allocation/initialization, | |
2409 // try to capture it into the initialization, or hoist it above. | |
2410 Node *StoreNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
2411 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
2412 if (p) return (p == NodeSentinel) ? NULL : p; | |
2413 | |
2414 Node* mem = in(MemNode::Memory); | |
2415 Node* address = in(MemNode::Address); | |
2416 | |
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2417 // Back-to-back stores to same address? Fold em up. Generally |
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2418 // unsafe if I have intervening uses... Also disallowed for StoreCM |
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2419 // since they must follow each StoreP operation. Redundant StoreCMs |
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2420 // are eliminated just before matching in final_graph_reshape. |
4778 | 2421 if (mem->is_Store() && mem->in(MemNode::Address)->eqv_uncast(address) && |
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2422 mem->Opcode() != Op_StoreCM) { |
0 | 2423 // Looking at a dead closed cycle of memory? |
2424 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal"); | |
2425 | |
2426 assert(Opcode() == mem->Opcode() || | |
2427 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw, | |
2428 "no mismatched stores, except on raw memory"); | |
2429 | |
2430 if (mem->outcnt() == 1 && // check for intervening uses | |
2431 mem->as_Store()->memory_size() <= this->memory_size()) { | |
2432 // If anybody other than 'this' uses 'mem', we cannot fold 'mem' away. | |
2433 // For example, 'mem' might be the final state at a conditional return. | |
2434 // Or, 'mem' might be used by some node which is live at the same time | |
2435 // 'this' is live, which might be unschedulable. So, require exactly | |
2436 // ONE user, the 'this' store, until such time as we clone 'mem' for | |
2437 // each of 'mem's uses (thus making the exactly-1-user-rule hold true). | |
2438 if (can_reshape) { // (%%% is this an anachronism?) | |
2439 set_req_X(MemNode::Memory, mem->in(MemNode::Memory), | |
2440 phase->is_IterGVN()); | |
2441 } else { | |
2442 // It's OK to do this in the parser, since DU info is always accurate, | |
2443 // and the parser always refers to nodes via SafePointNode maps. | |
2444 set_req(MemNode::Memory, mem->in(MemNode::Memory)); | |
2445 } | |
2446 return this; | |
2447 } | |
2448 } | |
2449 | |
2450 // Capture an unaliased, unconditional, simple store into an initializer. | |
2451 // Or, if it is independent of the allocation, hoist it above the allocation. | |
2452 if (ReduceFieldZeroing && /*can_reshape &&*/ | |
2453 mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
2454 InitializeNode* init = mem->in(0)->as_Initialize(); | |
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2455 intptr_t offset = init->can_capture_store(this, phase, can_reshape); |
0 | 2456 if (offset > 0) { |
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2457 Node* moved = init->capture_store(this, offset, phase, can_reshape); |
0 | 2458 // If the InitializeNode captured me, it made a raw copy of me, |
2459 // and I need to disappear. | |
2460 if (moved != NULL) { | |
2461 // %%% hack to ensure that Ideal returns a new node: | |
2462 mem = MergeMemNode::make(phase->C, mem); | |
2463 return mem; // fold me away | |
2464 } | |
2465 } | |
2466 } | |
2467 | |
2468 return NULL; // No further progress | |
2469 } | |
2470 | |
2471 //------------------------------Value----------------------------------------- | |
2472 const Type *StoreNode::Value( PhaseTransform *phase ) const { | |
2473 // Either input is TOP ==> the result is TOP | |
2474 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2475 if( t1 == Type::TOP ) return Type::TOP; | |
2476 const Type *t2 = phase->type( in(MemNode::Address) ); | |
2477 if( t2 == Type::TOP ) return Type::TOP; | |
2478 const Type *t3 = phase->type( in(MemNode::ValueIn) ); | |
2479 if( t3 == Type::TOP ) return Type::TOP; | |
2480 return Type::MEMORY; | |
2481 } | |
2482 | |
2483 //------------------------------Identity--------------------------------------- | |
2484 // Remove redundant stores: | |
2485 // Store(m, p, Load(m, p)) changes to m. | |
2486 // Store(, p, x) -> Store(m, p, x) changes to Store(m, p, x). | |
2487 Node *StoreNode::Identity( PhaseTransform *phase ) { | |
2488 Node* mem = in(MemNode::Memory); | |
2489 Node* adr = in(MemNode::Address); | |
2490 Node* val = in(MemNode::ValueIn); | |
2491 | |
2492 // Load then Store? Then the Store is useless | |
2493 if (val->is_Load() && | |
4778 | 2494 val->in(MemNode::Address)->eqv_uncast(adr) && |
2495 val->in(MemNode::Memory )->eqv_uncast(mem) && | |
0 | 2496 val->as_Load()->store_Opcode() == Opcode()) { |
2497 return mem; | |
2498 } | |
2499 | |
2500 // Two stores in a row of the same value? | |
2501 if (mem->is_Store() && | |
4778 | 2502 mem->in(MemNode::Address)->eqv_uncast(adr) && |
2503 mem->in(MemNode::ValueIn)->eqv_uncast(val) && | |
0 | 2504 mem->Opcode() == Opcode()) { |
2505 return mem; | |
2506 } | |
2507 | |
2508 // Store of zero anywhere into a freshly-allocated object? | |
2509 // Then the store is useless. | |
2510 // (It must already have been captured by the InitializeNode.) | |
2511 if (ReduceFieldZeroing && phase->type(val)->is_zero_type()) { | |
2512 // a newly allocated object is already all-zeroes everywhere | |
2513 if (mem->is_Proj() && mem->in(0)->is_Allocate()) { | |
2514 return mem; | |
2515 } | |
2516 | |
2517 // the store may also apply to zero-bits in an earlier object | |
2518 Node* prev_mem = find_previous_store(phase); | |
2519 // Steps (a), (b): Walk past independent stores to find an exact match. | |
2520 if (prev_mem != NULL) { | |
2521 Node* prev_val = can_see_stored_value(prev_mem, phase); | |
2522 if (prev_val != NULL && phase->eqv(prev_val, val)) { | |
2523 // prev_val and val might differ by a cast; it would be good | |
2524 // to keep the more informative of the two. | |
2525 return mem; | |
2526 } | |
2527 } | |
2528 } | |
2529 | |
2530 return this; | |
2531 } | |
2532 | |
2533 //------------------------------match_edge------------------------------------- | |
2534 // Do we Match on this edge index or not? Match only memory & value | |
2535 uint StoreNode::match_edge(uint idx) const { | |
2536 return idx == MemNode::Address || idx == MemNode::ValueIn; | |
2537 } | |
2538 | |
2539 //------------------------------cmp-------------------------------------------- | |
2540 // Do not common stores up together. They generally have to be split | |
2541 // back up anyways, so do not bother. | |
2542 uint StoreNode::cmp( const Node &n ) const { | |
2543 return (&n == this); // Always fail except on self | |
2544 } | |
2545 | |
2546 //------------------------------Ideal_masked_input----------------------------- | |
2547 // Check for a useless mask before a partial-word store | |
2548 // (StoreB ... (AndI valIn conIa) ) | |
2549 // If (conIa & mask == mask) this simplifies to | |
2550 // (StoreB ... (valIn) ) | |
2551 Node *StoreNode::Ideal_masked_input(PhaseGVN *phase, uint mask) { | |
2552 Node *val = in(MemNode::ValueIn); | |
2553 if( val->Opcode() == Op_AndI ) { | |
2554 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2555 if( t && t->is_con() && (t->get_con() & mask) == mask ) { | |
2556 set_req(MemNode::ValueIn, val->in(1)); | |
2557 return this; | |
2558 } | |
2559 } | |
2560 return NULL; | |
2561 } | |
2562 | |
2563 | |
2564 //------------------------------Ideal_sign_extended_input---------------------- | |
2565 // Check for useless sign-extension before a partial-word store | |
2566 // (StoreB ... (RShiftI _ (LShiftI _ valIn conIL ) conIR) ) | |
2567 // If (conIL == conIR && conIR <= num_bits) this simplifies to | |
2568 // (StoreB ... (valIn) ) | |
2569 Node *StoreNode::Ideal_sign_extended_input(PhaseGVN *phase, int num_bits) { | |
2570 Node *val = in(MemNode::ValueIn); | |
2571 if( val->Opcode() == Op_RShiftI ) { | |
2572 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2573 if( t && t->is_con() && (t->get_con() <= num_bits) ) { | |
2574 Node *shl = val->in(1); | |
2575 if( shl->Opcode() == Op_LShiftI ) { | |
2576 const TypeInt *t2 = phase->type( shl->in(2) )->isa_int(); | |
2577 if( t2 && t2->is_con() && (t2->get_con() == t->get_con()) ) { | |
2578 set_req(MemNode::ValueIn, shl->in(1)); | |
2579 return this; | |
2580 } | |
2581 } | |
2582 } | |
2583 } | |
2584 return NULL; | |
2585 } | |
2586 | |
2587 //------------------------------value_never_loaded----------------------------------- | |
2588 // Determine whether there are any possible loads of the value stored. | |
2589 // For simplicity, we actually check if there are any loads from the | |
2590 // address stored to, not just for loads of the value stored by this node. | |
2591 // | |
2592 bool StoreNode::value_never_loaded( PhaseTransform *phase) const { | |
2593 Node *adr = in(Address); | |
2594 const TypeOopPtr *adr_oop = phase->type(adr)->isa_oopptr(); | |
2595 if (adr_oop == NULL) | |
2596 return false; | |
223 | 2597 if (!adr_oop->is_known_instance_field()) |
0 | 2598 return false; // if not a distinct instance, there may be aliases of the address |
2599 for (DUIterator_Fast imax, i = adr->fast_outs(imax); i < imax; i++) { | |
2600 Node *use = adr->fast_out(i); | |
2601 int opc = use->Opcode(); | |
2602 if (use->is_Load() || use->is_LoadStore()) { | |
2603 return false; | |
2604 } | |
2605 } | |
2606 return true; | |
2607 } | |
2608 | |
2609 //============================================================================= | |
2610 //------------------------------Ideal------------------------------------------ | |
2611 // If the store is from an AND mask that leaves the low bits untouched, then | |
2612 // we can skip the AND operation. If the store is from a sign-extension | |
2613 // (a left shift, then right shift) we can skip both. | |
2614 Node *StoreBNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2615 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFF); | |
2616 if( progress != NULL ) return progress; | |
2617 | |
2618 progress = StoreNode::Ideal_sign_extended_input(phase, 24); | |
2619 if( progress != NULL ) return progress; | |
2620 | |
2621 // Finally check the default case | |
2622 return StoreNode::Ideal(phase, can_reshape); | |
2623 } | |
2624 | |
2625 //============================================================================= | |
2626 //------------------------------Ideal------------------------------------------ | |
2627 // If the store is from an AND mask that leaves the low bits untouched, then | |
2628 // we can skip the AND operation | |
2629 Node *StoreCNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2630 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFFFF); | |
2631 if( progress != NULL ) return progress; | |
2632 | |
2633 progress = StoreNode::Ideal_sign_extended_input(phase, 16); | |
2634 if( progress != NULL ) return progress; | |
2635 | |
2636 // Finally check the default case | |
2637 return StoreNode::Ideal(phase, can_reshape); | |
2638 } | |
2639 | |
2640 //============================================================================= | |
2641 //------------------------------Identity--------------------------------------- | |
2642 Node *StoreCMNode::Identity( PhaseTransform *phase ) { | |
2643 // No need to card mark when storing a null ptr | |
2644 Node* my_store = in(MemNode::OopStore); | |
2645 if (my_store->is_Store()) { | |
2646 const Type *t1 = phase->type( my_store->in(MemNode::ValueIn) ); | |
2647 if( t1 == TypePtr::NULL_PTR ) { | |
2648 return in(MemNode::Memory); | |
2649 } | |
2650 } | |
2651 return this; | |
2652 } | |
2653 | |
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2654 //============================================================================= |
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2655 //------------------------------Ideal--------------------------------------- |
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2656 Node *StoreCMNode::Ideal(PhaseGVN *phase, bool can_reshape){ |
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2657 Node* progress = StoreNode::Ideal(phase, can_reshape); |
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2658 if (progress != NULL) return progress; |
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2659 |
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2660 Node* my_store = in(MemNode::OopStore); |
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2661 if (my_store->is_MergeMem()) { |
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2662 Node* mem = my_store->as_MergeMem()->memory_at(oop_alias_idx()); |
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2663 set_req(MemNode::OopStore, mem); |
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2664 return this; |
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|
2665 } |
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2666 |
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2667 return NULL; |
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2668 } |
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2669 |
0 | 2670 //------------------------------Value----------------------------------------- |
2671 const Type *StoreCMNode::Value( PhaseTransform *phase ) const { | |
43 | 2672 // Either input is TOP ==> the result is TOP |
2673 const Type *t = phase->type( in(MemNode::Memory) ); | |
2674 if( t == Type::TOP ) return Type::TOP; | |
2675 t = phase->type( in(MemNode::Address) ); | |
2676 if( t == Type::TOP ) return Type::TOP; | |
2677 t = phase->type( in(MemNode::ValueIn) ); | |
2678 if( t == Type::TOP ) return Type::TOP; | |
0 | 2679 // If extra input is TOP ==> the result is TOP |
43 | 2680 t = phase->type( in(MemNode::OopStore) ); |
2681 if( t == Type::TOP ) return Type::TOP; | |
0 | 2682 |
2683 return StoreNode::Value( phase ); | |
2684 } | |
2685 | |
2686 | |
2687 //============================================================================= | |
2688 //----------------------------------SCMemProjNode------------------------------ | |
2689 const Type * SCMemProjNode::Value( PhaseTransform *phase ) const | |
2690 { | |
2691 return bottom_type(); | |
2692 } | |
2693 | |
2694 //============================================================================= | |
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2695 //----------------------------------LoadStoreNode------------------------------ |
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2696 LoadStoreNode::LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at, const Type* rt, uint required ) |
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2697 : Node(required), |
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2698 _type(rt), |
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2699 _adr_type(at) |
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2700 { |
0 | 2701 init_req(MemNode::Control, c ); |
2702 init_req(MemNode::Memory , mem); | |
2703 init_req(MemNode::Address, adr); | |
2704 init_req(MemNode::ValueIn, val); | |
2705 init_class_id(Class_LoadStore); | |
6795
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2706 } |
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|
2707 |
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2708 uint LoadStoreNode::ideal_reg() const { |
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2709 return _type->ideal_reg(); |
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2710 } |
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2711 |
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2712 bool LoadStoreNode::result_not_used() const { |
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2713 for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) { |
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2714 Node *x = fast_out(i); |
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2715 if (x->Opcode() == Op_SCMemProj) continue; |
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2716 return false; |
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2717 } |
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2718 return true; |
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|
2719 } |
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|
2720 |
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2721 uint LoadStoreNode::size_of() const { return sizeof(*this); } |
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2722 |
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2723 //============================================================================= |
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2724 //----------------------------------LoadStoreConditionalNode-------------------- |
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2725 LoadStoreConditionalNode::LoadStoreConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex ) : LoadStoreNode(c, mem, adr, val, NULL, TypeInt::BOOL, 5) { |
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2726 init_req(ExpectedIn, ex ); |
0 | 2727 } |
2728 | |
2729 //============================================================================= | |
2730 //-------------------------------adr_type-------------------------------------- | |
2731 // Do we Match on this edge index or not? Do not match memory | |
2732 const TypePtr* ClearArrayNode::adr_type() const { | |
2733 Node *adr = in(3); | |
2734 return MemNode::calculate_adr_type(adr->bottom_type()); | |
2735 } | |
2736 | |
2737 //------------------------------match_edge------------------------------------- | |
2738 // Do we Match on this edge index or not? Do not match memory | |
2739 uint ClearArrayNode::match_edge(uint idx) const { | |
2740 return idx > 1; | |
2741 } | |
2742 | |
2743 //------------------------------Identity--------------------------------------- | |
2744 // Clearing a zero length array does nothing | |
2745 Node *ClearArrayNode::Identity( PhaseTransform *phase ) { | |
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2746 return phase->type(in(2))->higher_equal(TypeX::ZERO) ? in(1) : this; |
0 | 2747 } |
2748 | |
2749 //------------------------------Idealize--------------------------------------- | |
2750 // Clearing a short array is faster with stores | |
2751 Node *ClearArrayNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2752 const int unit = BytesPerLong; | |
2753 const TypeX* t = phase->type(in(2))->isa_intptr_t(); | |
2754 if (!t) return NULL; | |
2755 if (!t->is_con()) return NULL; | |
2756 intptr_t raw_count = t->get_con(); | |
2757 intptr_t size = raw_count; | |
2758 if (!Matcher::init_array_count_is_in_bytes) size *= unit; | |
2759 // Clearing nothing uses the Identity call. | |
2760 // Negative clears are possible on dead ClearArrays | |
2761 // (see jck test stmt114.stmt11402.val). | |
2762 if (size <= 0 || size % unit != 0) return NULL; | |
2763 intptr_t count = size / unit; | |
2764 // Length too long; use fast hardware clear | |
2765 if (size > Matcher::init_array_short_size) return NULL; | |
2766 Node *mem = in(1); | |
2767 if( phase->type(mem)==Type::TOP ) return NULL; | |
2768 Node *adr = in(3); | |
2769 const Type* at = phase->type(adr); | |
2770 if( at==Type::TOP ) return NULL; | |
2771 const TypePtr* atp = at->isa_ptr(); | |
2772 // adjust atp to be the correct array element address type | |
2773 if (atp == NULL) atp = TypePtr::BOTTOM; | |
2774 else atp = atp->add_offset(Type::OffsetBot); | |
2775 // Get base for derived pointer purposes | |
2776 if( adr->Opcode() != Op_AddP ) Unimplemented(); | |
2777 Node *base = adr->in(1); | |
2778 | |
2779 Node *zero = phase->makecon(TypeLong::ZERO); | |
2780 Node *off = phase->MakeConX(BytesPerLong); | |
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2781 mem = new (phase->C) StoreLNode(in(0),mem,adr,atp,zero,MemNode::unordered,false); |
0 | 2782 count--; |
2783 while( count-- ) { | |
2784 mem = phase->transform(mem); | |
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2785 adr = phase->transform(new (phase->C) AddPNode(base,adr,off)); |
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2786 mem = new (phase->C) StoreLNode(in(0),mem,adr,atp,zero,MemNode::unordered,false); |
0 | 2787 } |
2788 return mem; | |
2789 } | |
2790 | |
1100
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2791 //----------------------------step_through---------------------------------- |
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2792 // Return allocation input memory edge if it is different instance |
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2793 // or itself if it is the one we are looking for. |
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2794 bool ClearArrayNode::step_through(Node** np, uint instance_id, PhaseTransform* phase) { |
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2795 Node* n = *np; |
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2796 assert(n->is_ClearArray(), "sanity"); |
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2797 intptr_t offset; |
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2798 AllocateNode* alloc = AllocateNode::Ideal_allocation(n->in(3), phase, offset); |
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2799 // This method is called only before Allocate nodes are expanded during |
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2800 // macro nodes expansion. Before that ClearArray nodes are only generated |
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2801 // in LibraryCallKit::generate_arraycopy() which follows allocations. |
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2802 assert(alloc != NULL, "should have allocation"); |
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2803 if (alloc->_idx == instance_id) { |
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2804 // Can not bypass initialization of the instance we are looking for. |
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|
2805 return false; |
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|
2806 } |
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|
2807 // Otherwise skip it. |
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|
2808 InitializeNode* init = alloc->initialization(); |
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2809 if (init != NULL) |
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|
2810 *np = init->in(TypeFunc::Memory); |
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|
2811 else |
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|
2812 *np = alloc->in(TypeFunc::Memory); |
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2813 return true; |
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|
2814 } |
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|
2815 |
0 | 2816 //----------------------------clear_memory------------------------------------- |
2817 // Generate code to initialize object storage to zero. | |
2818 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2819 intptr_t start_offset, | |
2820 Node* end_offset, | |
2821 PhaseGVN* phase) { | |
2822 Compile* C = phase->C; | |
2823 intptr_t offset = start_offset; | |
2824 | |
2825 int unit = BytesPerLong; | |
2826 if ((offset % unit) != 0) { | |
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2827 Node* adr = new (C) AddPNode(dest, dest, phase->MakeConX(offset)); |
0 | 2828 adr = phase->transform(adr); |
2829 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2830 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT, MemNode::unordered); |
0 | 2831 mem = phase->transform(mem); |
2832 offset += BytesPerInt; | |
2833 } | |
2834 assert((offset % unit) == 0, ""); | |
2835 | |
2836 // Initialize the remaining stuff, if any, with a ClearArray. | |
2837 return clear_memory(ctl, mem, dest, phase->MakeConX(offset), end_offset, phase); | |
2838 } | |
2839 | |
2840 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2841 Node* start_offset, | |
2842 Node* end_offset, | |
2843 PhaseGVN* phase) { | |
68
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|
2844 if (start_offset == end_offset) { |
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diff
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|
2845 // nothing to do |
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|
2846 return mem; |
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diff
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|
2847 } |
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|
2848 |
0 | 2849 Compile* C = phase->C; |
2850 int unit = BytesPerLong; | |
2851 Node* zbase = start_offset; | |
2852 Node* zend = end_offset; | |
2853 | |
2854 // Scale to the unit required by the CPU: | |
2855 if (!Matcher::init_array_count_is_in_bytes) { | |
2856 Node* shift = phase->intcon(exact_log2(unit)); | |
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2857 zbase = phase->transform( new(C) URShiftXNode(zbase, shift) ); |
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2858 zend = phase->transform( new(C) URShiftXNode(zend, shift) ); |
0 | 2859 } |
2860 | |
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2861 // Bulk clear double-words |
6804
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2862 Node* zsize = phase->transform( new(C) SubXNode(zend, zbase) ); |
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2863 Node* adr = phase->transform( new(C) AddPNode(dest, dest, start_offset) ); |
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2864 mem = new (C) ClearArrayNode(ctl, mem, zsize, adr); |
0 | 2865 return phase->transform(mem); |
2866 } | |
2867 | |
2868 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2869 intptr_t start_offset, | |
2870 intptr_t end_offset, | |
2871 PhaseGVN* phase) { | |
68
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2872 if (start_offset == end_offset) { |
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|
2873 // nothing to do |
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|
2874 return mem; |
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|
2875 } |
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|
2876 |
0 | 2877 Compile* C = phase->C; |
2878 assert((end_offset % BytesPerInt) == 0, "odd end offset"); | |
2879 intptr_t done_offset = end_offset; | |
2880 if ((done_offset % BytesPerLong) != 0) { | |
2881 done_offset -= BytesPerInt; | |
2882 } | |
2883 if (done_offset > start_offset) { | |
2884 mem = clear_memory(ctl, mem, dest, | |
2885 start_offset, phase->MakeConX(done_offset), phase); | |
2886 } | |
2887 if (done_offset < end_offset) { // emit the final 32-bit store | |
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2888 Node* adr = new (C) AddPNode(dest, dest, phase->MakeConX(done_offset)); |
0 | 2889 adr = phase->transform(adr); |
2890 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2891 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT, MemNode::unordered); |
0 | 2892 mem = phase->transform(mem); |
2893 done_offset += BytesPerInt; | |
2894 } | |
2895 assert(done_offset == end_offset, ""); | |
2896 return mem; | |
2897 } | |
2898 | |
2899 //============================================================================= | |
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|
2900 // Do not match memory edge. |
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|
2901 uint StrIntrinsicNode::match_edge(uint idx) const { |
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|
2902 return idx == 2 || idx == 3; |
681 | 2903 } |
2904 | |
2905 //------------------------------Ideal------------------------------------------ | |
2906 // Return a node which is more "ideal" than the current node. Strip out | |
2907 // control copies | |
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2908 Node *StrIntrinsicNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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|
2909 if (remove_dead_region(phase, can_reshape)) return this; |
4115 | 2910 // Don't bother trying to transform a dead node |
2911 if (in(0) && in(0)->is_top()) return NULL; | |
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2912 |
2417 | 2913 if (can_reshape) { |
2914 Node* mem = phase->transform(in(MemNode::Memory)); | |
2915 // If transformed to a MergeMem, get the desired slice | |
2916 uint alias_idx = phase->C->get_alias_index(adr_type()); | |
2917 mem = mem->is_MergeMem() ? mem->as_MergeMem()->memory_at(alias_idx) : mem; | |
2918 if (mem != in(MemNode::Memory)) { | |
2919 set_req(MemNode::Memory, mem); | |
2920 return this; | |
2921 } | |
2922 } | |
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2923 return NULL; |
169
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|
2924 } |
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2925 |
4115 | 2926 //------------------------------Value------------------------------------------ |
2927 const Type *StrIntrinsicNode::Value( PhaseTransform *phase ) const { | |
2928 if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP; | |
2929 return bottom_type(); | |
2930 } | |
2931 | |
0 | 2932 //============================================================================= |
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2933 //------------------------------match_edge------------------------------------- |
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|
2934 // Do not match memory edge |
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2935 uint EncodeISOArrayNode::match_edge(uint idx) const { |
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2936 return idx == 2 || idx == 3; // EncodeISOArray src (Binary dst len) |
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2937 } |
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2938 |
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2939 //------------------------------Ideal------------------------------------------ |
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2940 // Return a node which is more "ideal" than the current node. Strip out |
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2941 // control copies |
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2942 Node *EncodeISOArrayNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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2943 return remove_dead_region(phase, can_reshape) ? this : NULL; |
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2944 } |
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2945 |
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2946 //------------------------------Value------------------------------------------ |
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2947 const Type *EncodeISOArrayNode::Value(PhaseTransform *phase) const { |
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2948 if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP; |
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2949 return bottom_type(); |
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2950 } |
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2951 |
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2952 //============================================================================= |
0 | 2953 MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent) |
2954 : MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)), | |
2955 _adr_type(C->get_adr_type(alias_idx)) | |
2956 { | |
2957 init_class_id(Class_MemBar); | |
2958 Node* top = C->top(); | |
2959 init_req(TypeFunc::I_O,top); | |
2960 init_req(TypeFunc::FramePtr,top); | |
2961 init_req(TypeFunc::ReturnAdr,top); | |
2962 if (precedent != NULL) | |
2963 init_req(TypeFunc::Parms, precedent); | |
2964 } | |
2965 | |
2966 //------------------------------cmp-------------------------------------------- | |
2967 uint MemBarNode::hash() const { return NO_HASH; } | |
2968 uint MemBarNode::cmp( const Node &n ) const { | |
2969 return (&n == this); // Always fail except on self | |
2970 } | |
2971 | |
2972 //------------------------------make------------------------------------------- | |
2973 MemBarNode* MemBarNode::make(Compile* C, int opcode, int atp, Node* pn) { | |
2974 switch (opcode) { | |
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2975 case Op_MemBarAcquire: return new(C) MemBarAcquireNode(C, atp, pn); |
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2976 case Op_LoadFence: return new(C) LoadFenceNode(C, atp, pn); |
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2977 case Op_MemBarRelease: return new(C) MemBarReleaseNode(C, atp, pn); |
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2978 case Op_StoreFence: return new(C) StoreFenceNode(C, atp, pn); |
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2979 case Op_MemBarAcquireLock: return new(C) MemBarAcquireLockNode(C, atp, pn); |
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2980 case Op_MemBarReleaseLock: return new(C) MemBarReleaseLockNode(C, atp, pn); |
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2981 case Op_MemBarVolatile: return new(C) MemBarVolatileNode(C, atp, pn); |
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2982 case Op_MemBarCPUOrder: return new(C) MemBarCPUOrderNode(C, atp, pn); |
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2983 case Op_Initialize: return new(C) InitializeNode(C, atp, pn); |
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2984 case Op_MemBarStoreStore: return new(C) MemBarStoreStoreNode(C, atp, pn); |
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2985 default: ShouldNotReachHere(); return NULL; |
0 | 2986 } |
2987 } | |
2988 | |
2989 //------------------------------Ideal------------------------------------------ | |
2990 // Return a node which is more "ideal" than the current node. Strip out | |
2991 // control copies | |
2992 Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
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2993 if (remove_dead_region(phase, can_reshape)) return this; |
4115 | 2994 // Don't bother trying to transform a dead node |
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2995 if (in(0) && in(0)->is_top()) { |
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2996 return NULL; |
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2997 } |
1100
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2998 |
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2999 // Eliminate volatile MemBars for scalar replaced objects. |
10278 | 3000 if (can_reshape && req() == (Precedent+1)) { |
3001 bool eliminate = false; | |
3002 int opc = Opcode(); | |
3003 if ((opc == Op_MemBarAcquire || opc == Op_MemBarVolatile)) { | |
3004 // Volatile field loads and stores. | |
3005 Node* my_mem = in(MemBarNode::Precedent); | |
11005
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3006 // The MembarAquire may keep an unused LoadNode alive through the Precedent edge |
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3007 if ((my_mem != NULL) && (opc == Op_MemBarAcquire) && (my_mem->outcnt() == 1)) { |
11044 | 3008 // if the Precedent is a decodeN and its input (a Load) is used at more than one place, |
3009 // replace this Precedent (decodeN) with the Load instead. | |
3010 if ((my_mem->Opcode() == Op_DecodeN) && (my_mem->in(1)->outcnt() > 1)) { | |
3011 Node* load_node = my_mem->in(1); | |
3012 set_req(MemBarNode::Precedent, load_node); | |
3013 phase->is_IterGVN()->_worklist.push(my_mem); | |
3014 my_mem = load_node; | |
3015 } else { | |
3016 assert(my_mem->unique_out() == this, "sanity"); | |
3017 del_req(Precedent); | |
3018 phase->is_IterGVN()->_worklist.push(my_mem); // remove dead node later | |
3019 my_mem = NULL; | |
3020 } | |
11005
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3021 } |
10278 | 3022 if (my_mem != NULL && my_mem->is_Mem()) { |
3023 const TypeOopPtr* t_oop = my_mem->in(MemNode::Address)->bottom_type()->isa_oopptr(); | |
3024 // Check for scalar replaced object reference. | |
3025 if( t_oop != NULL && t_oop->is_known_instance_field() && | |
3026 t_oop->offset() != Type::OffsetBot && | |
3027 t_oop->offset() != Type::OffsetTop) { | |
3028 eliminate = true; | |
3029 } | |
1100
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3030 } |
10278 | 3031 } else if (opc == Op_MemBarRelease) { |
3032 // Final field stores. | |
3033 Node* alloc = AllocateNode::Ideal_allocation(in(MemBarNode::Precedent), phase); | |
3034 if ((alloc != NULL) && alloc->is_Allocate() && | |
3035 alloc->as_Allocate()->_is_non_escaping) { | |
3036 // The allocated object does not escape. | |
3037 eliminate = true; | |
3038 } | |
3039 } | |
3040 if (eliminate) { | |
3041 // Replace MemBar projections by its inputs. | |
3042 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
3043 igvn->replace_node(proj_out(TypeFunc::Memory), in(TypeFunc::Memory)); | |
3044 igvn->replace_node(proj_out(TypeFunc::Control), in(TypeFunc::Control)); | |
3045 // Must return either the original node (now dead) or a new node | |
3046 // (Do not return a top here, since that would break the uniqueness of top.) | |
3047 return new (phase->C) ConINode(TypeInt::ZERO); | |
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3048 } |
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3049 } |
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3050 return NULL; |
0 | 3051 } |
3052 | |
3053 //------------------------------Value------------------------------------------ | |
3054 const Type *MemBarNode::Value( PhaseTransform *phase ) const { | |
3055 if( !in(0) ) return Type::TOP; | |
3056 if( phase->type(in(0)) == Type::TOP ) | |
3057 return Type::TOP; | |
3058 return TypeTuple::MEMBAR; | |
3059 } | |
3060 | |
3061 //------------------------------match------------------------------------------ | |
3062 // Construct projections for memory. | |
3063 Node *MemBarNode::match( const ProjNode *proj, const Matcher *m ) { | |
3064 switch (proj->_con) { | |
3065 case TypeFunc::Control: | |
3066 case TypeFunc::Memory: | |
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3067 return new (m->C) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); |
0 | 3068 } |
3069 ShouldNotReachHere(); | |
3070 return NULL; | |
3071 } | |
3072 | |
3073 //===========================InitializeNode==================================== | |
3074 // SUMMARY: | |
3075 // This node acts as a memory barrier on raw memory, after some raw stores. | |
3076 // The 'cooked' oop value feeds from the Initialize, not the Allocation. | |
3077 // The Initialize can 'capture' suitably constrained stores as raw inits. | |
3078 // It can coalesce related raw stores into larger units (called 'tiles'). | |
3079 // It can avoid zeroing new storage for memory units which have raw inits. | |
3080 // At macro-expansion, it is marked 'complete', and does not optimize further. | |
3081 // | |
3082 // EXAMPLE: | |
3083 // The object 'new short[2]' occupies 16 bytes in a 32-bit machine. | |
3084 // ctl = incoming control; mem* = incoming memory | |
3085 // (Note: A star * on a memory edge denotes I/O and other standard edges.) | |
3086 // First allocate uninitialized memory and fill in the header: | |
3087 // alloc = (Allocate ctl mem* 16 #short[].klass ...) | |
3088 // ctl := alloc.Control; mem* := alloc.Memory* | |
3089 // rawmem = alloc.Memory; rawoop = alloc.RawAddress | |
3090 // Then initialize to zero the non-header parts of the raw memory block: | |
3091 // init = (Initialize alloc.Control alloc.Memory* alloc.RawAddress) | |
3092 // ctl := init.Control; mem.SLICE(#short[*]) := init.Memory | |
3093 // After the initialize node executes, the object is ready for service: | |
3094 // oop := (CheckCastPP init.Control alloc.RawAddress #short[]) | |
3095 // Suppose its body is immediately initialized as {1,2}: | |
3096 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
3097 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
3098 // mem.SLICE(#short[*]) := store2 | |
3099 // | |
3100 // DETAILS: | |
3101 // An InitializeNode collects and isolates object initialization after | |
3102 // an AllocateNode and before the next possible safepoint. As a | |
3103 // memory barrier (MemBarNode), it keeps critical stores from drifting | |
3104 // down past any safepoint or any publication of the allocation. | |
3105 // Before this barrier, a newly-allocated object may have uninitialized bits. | |
3106 // After this barrier, it may be treated as a real oop, and GC is allowed. | |
3107 // | |
3108 // The semantics of the InitializeNode include an implicit zeroing of | |
3109 // the new object from object header to the end of the object. | |
3110 // (The object header and end are determined by the AllocateNode.) | |
3111 // | |
3112 // Certain stores may be added as direct inputs to the InitializeNode. | |
3113 // These stores must update raw memory, and they must be to addresses | |
3114 // derived from the raw address produced by AllocateNode, and with | |
3115 // a constant offset. They must be ordered by increasing offset. | |
3116 // The first one is at in(RawStores), the last at in(req()-1). | |
3117 // Unlike most memory operations, they are not linked in a chain, | |
3118 // but are displayed in parallel as users of the rawmem output of | |
3119 // the allocation. | |
3120 // | |
3121 // (See comments in InitializeNode::capture_store, which continue | |
3122 // the example given above.) | |
3123 // | |
3124 // When the associated Allocate is macro-expanded, the InitializeNode | |
3125 // may be rewritten to optimize collected stores. A ClearArrayNode | |
3126 // may also be created at that point to represent any required zeroing. | |
3127 // The InitializeNode is then marked 'complete', prohibiting further | |
3128 // capturing of nearby memory operations. | |
3129 // | |
3130 // During macro-expansion, all captured initializations which store | |
605 | 3131 // constant values of 32 bits or smaller are coalesced (if advantageous) |
0 | 3132 // into larger 'tiles' 32 or 64 bits. This allows an object to be |
3133 // initialized in fewer memory operations. Memory words which are | |
3134 // covered by neither tiles nor non-constant stores are pre-zeroed | |
3135 // by explicit stores of zero. (The code shape happens to do all | |
3136 // zeroing first, then all other stores, with both sequences occurring | |
3137 // in order of ascending offsets.) | |
3138 // | |
3139 // Alternatively, code may be inserted between an AllocateNode and its | |
3140 // InitializeNode, to perform arbitrary initialization of the new object. | |
3141 // E.g., the object copying intrinsics insert complex data transfers here. | |
3142 // The initialization must then be marked as 'complete' disable the | |
3143 // built-in zeroing semantics and the collection of initializing stores. | |
3144 // | |
3145 // While an InitializeNode is incomplete, reads from the memory state | |
3146 // produced by it are optimizable if they match the control edge and | |
3147 // new oop address associated with the allocation/initialization. | |
3148 // They return a stored value (if the offset matches) or else zero. | |
3149 // A write to the memory state, if it matches control and address, | |
3150 // and if it is to a constant offset, may be 'captured' by the | |
3151 // InitializeNode. It is cloned as a raw memory operation and rewired | |
3152 // inside the initialization, to the raw oop produced by the allocation. | |
3153 // Operations on addresses which are provably distinct (e.g., to | |
3154 // other AllocateNodes) are allowed to bypass the initialization. | |
3155 // | |
3156 // The effect of all this is to consolidate object initialization | |
3157 // (both arrays and non-arrays, both piecewise and bulk) into a | |
3158 // single location, where it can be optimized as a unit. | |
3159 // | |
3160 // Only stores with an offset less than TrackedInitializationLimit words | |
3161 // will be considered for capture by an InitializeNode. This puts a | |
3162 // reasonable limit on the complexity of optimized initializations. | |
3163 | |
3164 //---------------------------InitializeNode------------------------------------ | |
3165 InitializeNode::InitializeNode(Compile* C, int adr_type, Node* rawoop) | |
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3166 : _is_complete(Incomplete), _does_not_escape(false), |
0 | 3167 MemBarNode(C, adr_type, rawoop) |
3168 { | |
3169 init_class_id(Class_Initialize); | |
3170 | |
3171 assert(adr_type == Compile::AliasIdxRaw, "only valid atp"); | |
3172 assert(in(RawAddress) == rawoop, "proper init"); | |
3173 // Note: allocation() can be NULL, for secondary initialization barriers | |
3174 } | |
3175 | |
3176 // Since this node is not matched, it will be processed by the | |
3177 // register allocator. Declare that there are no constraints | |
3178 // on the allocation of the RawAddress edge. | |
3179 const RegMask &InitializeNode::in_RegMask(uint idx) const { | |
3180 // This edge should be set to top, by the set_complete. But be conservative. | |
3181 if (idx == InitializeNode::RawAddress) | |
3182 return *(Compile::current()->matcher()->idealreg2spillmask[in(idx)->ideal_reg()]); | |
3183 return RegMask::Empty; | |
3184 } | |
3185 | |
3186 Node* InitializeNode::memory(uint alias_idx) { | |
3187 Node* mem = in(Memory); | |
3188 if (mem->is_MergeMem()) { | |
3189 return mem->as_MergeMem()->memory_at(alias_idx); | |
3190 } else { | |
3191 // incoming raw memory is not split | |
3192 return mem; | |
3193 } | |
3194 } | |
3195 | |
3196 bool InitializeNode::is_non_zero() { | |
3197 if (is_complete()) return false; | |
3198 remove_extra_zeroes(); | |
3199 return (req() > RawStores); | |
3200 } | |
3201 | |
3202 void InitializeNode::set_complete(PhaseGVN* phase) { | |
3203 assert(!is_complete(), "caller responsibility"); | |
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3204 _is_complete = Complete; |
0 | 3205 |
3206 // After this node is complete, it contains a bunch of | |
3207 // raw-memory initializations. There is no need for | |
3208 // it to have anything to do with non-raw memory effects. | |
3209 // Therefore, tell all non-raw users to re-optimize themselves, | |
3210 // after skipping the memory effects of this initialization. | |
3211 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
3212 if (igvn) igvn->add_users_to_worklist(this); | |
3213 } | |
3214 | |
3215 // convenience function | |
3216 // return false if the init contains any stores already | |
3217 bool AllocateNode::maybe_set_complete(PhaseGVN* phase) { | |
3218 InitializeNode* init = initialization(); | |
3219 if (init == NULL || init->is_complete()) return false; | |
3220 init->remove_extra_zeroes(); | |
3221 // for now, if this allocation has already collected any inits, bail: | |
3222 if (init->is_non_zero()) return false; | |
3223 init->set_complete(phase); | |
3224 return true; | |
3225 } | |
3226 | |
3227 void InitializeNode::remove_extra_zeroes() { | |
3228 if (req() == RawStores) return; | |
3229 Node* zmem = zero_memory(); | |
3230 uint fill = RawStores; | |
3231 for (uint i = fill; i < req(); i++) { | |
3232 Node* n = in(i); | |
3233 if (n->is_top() || n == zmem) continue; // skip | |
3234 if (fill < i) set_req(fill, n); // compact | |
3235 ++fill; | |
3236 } | |
3237 // delete any empty spaces created: | |
3238 while (fill < req()) { | |
3239 del_req(fill); | |
3240 } | |
3241 } | |
3242 | |
3243 // Helper for remembering which stores go with which offsets. | |
3244 intptr_t InitializeNode::get_store_offset(Node* st, PhaseTransform* phase) { | |
3245 if (!st->is_Store()) return -1; // can happen to dead code via subsume_node | |
3246 intptr_t offset = -1; | |
3247 Node* base = AddPNode::Ideal_base_and_offset(st->in(MemNode::Address), | |
3248 phase, offset); | |
3249 if (base == NULL) return -1; // something is dead, | |
3250 if (offset < 0) return -1; // dead, dead | |
3251 return offset; | |
3252 } | |
3253 | |
3254 // Helper for proving that an initialization expression is | |
3255 // "simple enough" to be folded into an object initialization. | |
3256 // Attempts to prove that a store's initial value 'n' can be captured | |
3257 // within the initialization without creating a vicious cycle, such as: | |
3258 // { Foo p = new Foo(); p.next = p; } | |
3259 // True for constants and parameters and small combinations thereof. | |
10278 | 3260 bool InitializeNode::detect_init_independence(Node* n, int& count) { |
0 | 3261 if (n == NULL) return true; // (can this really happen?) |
3262 if (n->is_Proj()) n = n->in(0); | |
3263 if (n == this) return false; // found a cycle | |
3264 if (n->is_Con()) return true; | |
3265 if (n->is_Start()) return true; // params, etc., are OK | |
3266 if (n->is_Root()) return true; // even better | |
3267 | |
3268 Node* ctl = n->in(0); | |
3269 if (ctl != NULL && !ctl->is_top()) { | |
3270 if (ctl->is_Proj()) ctl = ctl->in(0); | |
3271 if (ctl == this) return false; | |
3272 | |
3273 // If we already know that the enclosing memory op is pinned right after | |
3274 // the init, then any control flow that the store has picked up | |
3275 // must have preceded the init, or else be equal to the init. | |
3276 // Even after loop optimizations (which might change control edges) | |
3277 // a store is never pinned *before* the availability of its inputs. | |
119
d1a5218d7eaf
6686791: Side effect in NumberFormat tests with -server -Xcomp
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|
3278 if (!MemNode::all_controls_dominate(n, this)) |
0 | 3279 return false; // failed to prove a good control |
3280 } | |
3281 | |
3282 // Check data edges for possible dependencies on 'this'. | |
3283 if ((count += 1) > 20) return false; // complexity limit | |
3284 for (uint i = 1; i < n->req(); i++) { | |
3285 Node* m = n->in(i); | |
3286 if (m == NULL || m == n || m->is_top()) continue; | |
3287 uint first_i = n->find_edge(m); | |
3288 if (i != first_i) continue; // process duplicate edge just once | |
10278 | 3289 if (!detect_init_independence(m, count)) { |
0 | 3290 return false; |
3291 } | |
3292 } | |
3293 | |
3294 return true; | |
3295 } | |
3296 | |
3297 // Here are all the checks a Store must pass before it can be moved into | |
3298 // an initialization. Returns zero if a check fails. | |
3299 // On success, returns the (constant) offset to which the store applies, | |
3300 // 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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|
3301 intptr_t InitializeNode::can_capture_store(StoreNode* st, PhaseTransform* phase, bool can_reshape) { |
0 | 3302 const int FAIL = 0; |
3303 if (st->req() != MemNode::ValueIn + 1) | |
3304 return FAIL; // an inscrutable StoreNode (card mark?) | |
3305 Node* ctl = st->in(MemNode::Control); | |
3306 if (!(ctl != NULL && ctl->is_Proj() && ctl->in(0) == this)) | |
3307 return FAIL; // must be unconditional after the initialization | |
3308 Node* mem = st->in(MemNode::Memory); | |
3309 if (!(mem->is_Proj() && mem->in(0) == this)) | |
3310 return FAIL; // must not be preceded by other stores | |
3311 Node* adr = st->in(MemNode::Address); | |
3312 intptr_t offset; | |
3313 AllocateNode* alloc = AllocateNode::Ideal_allocation(adr, phase, offset); | |
3314 if (alloc == NULL) | |
3315 return FAIL; // inscrutable address | |
3316 if (alloc != allocation()) | |
3317 return FAIL; // wrong allocation! (store needs to float up) | |
3318 Node* val = st->in(MemNode::ValueIn); | |
3319 int complexity_count = 0; | |
10278 | 3320 if (!detect_init_independence(val, complexity_count)) |
0 | 3321 return FAIL; // stored value must be 'simple enough' |
3322 | |
8116
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|
3323 // The Store can be captured only if nothing after the allocation |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3324 // 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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|
3325 // overwrites. |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
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|
3326 bool failed = false; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3327 // If is_complete_with_arraycopy() is true the shape of the graph is |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3328 // well defined and is safe so no need for extra checks. |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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|
3329 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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|
3330 // We are going to look at each use of the memory state following |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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diff
changeset
|
3331 // 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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|
3332 // Store writes. |
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|
3333 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
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|
3334 int alias_idx = phase->C->get_alias_index(t_adr); |
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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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|
3335 ResourceMark rm; |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
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|
3336 Unique_Node_List mems; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
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|
3337 mems.push(mem); |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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|
3338 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
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|
3339 for (uint next = 0; next < mems.size(); ++next) { |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
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|
3340 Node *m = mems.at(next); |
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|
3341 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { |
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|
3342 Node *n = m->fast_out(j); |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3343 if (n->outcnt() == 0) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3344 continue; |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
changeset
|
3345 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3346 if (n == st) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3347 continue; |
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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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|
3348 } else if (n->in(0) != NULL && n->in(0) != ctl) { |
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|
3349 // If the control of this use is different from the control |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
changeset
|
3350 // of the Store which is right after the InitializeNode then |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
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|
3351 // 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
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7637
diff
changeset
|
3352 // Store. |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3353 continue; |
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diff
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|
3354 } else if (n->is_MergeMem()) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
changeset
|
3355 if (n->as_MergeMem()->memory_at(alias_idx) == m) { |
6931f425c517
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roland
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diff
changeset
|
3356 // 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
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diff
changeset
|
3357 // later) that is a direct use of the memory state |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
changeset
|
3358 // 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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diff
changeset
|
3359 // store node that we'd like to capture. We need to check |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3360 // the uses of the MergeMemNode. |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
changeset
|
3361 mems.push(n); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3362 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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diff
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|
3363 } else if (n->is_Mem()) { |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
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|
3364 Node* other_adr = n->in(MemNode::Address); |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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diff
changeset
|
3365 if (other_adr == adr) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3366 failed = true; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3367 break; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3368 } else { |
6931f425c517
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roland
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7637
diff
changeset
|
3369 const TypePtr* other_t_adr = phase->type(other_adr)->isa_ptr(); |
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8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3370 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
|
3371 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
|
3372 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
|
3373 // 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
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7637
diff
changeset
|
3374 // 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
|
3375 // 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
|
3376 // 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
|
3377 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
|
3378 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
|
3379 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
|
3380 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
|
3381 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
|
3382 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
|
3383 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
|
3384 failed = true; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3385 break; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3386 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3387 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3388 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3389 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3390 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3391 } else { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3392 failed = true; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3393 break; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3394 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3395 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3396 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3397 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3398 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
|
3399 if (!can_reshape) { |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3400 // We decided we couldn't capture the store during parsing. We |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3401 // should try again during the next IGVN once the graph is |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3402 // cleaner. |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
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7637
diff
changeset
|
3403 phase->C->record_for_igvn(st); |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3404 } |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3405 return FAIL; |
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
roland
parents:
7637
diff
changeset
|
3406 } |
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7637
diff
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|
3407 |
0 | 3408 return offset; // success |
3409 } | |
3410 | |
3411 // Find the captured store in(i) which corresponds to the range | |
3412 // [start..start+size) in the initialized object. | |
3413 // If there is one, return its index i. If there isn't, return the | |
3414 // negative of the index where it should be inserted. | |
3415 // Return 0 if the queried range overlaps an initialization boundary | |
3416 // or if dead code is encountered. | |
3417 // If size_in_bytes is zero, do not bother with overlap checks. | |
3418 int InitializeNode::captured_store_insertion_point(intptr_t start, | |
3419 int size_in_bytes, | |
3420 PhaseTransform* phase) { | |
3421 const int FAIL = 0, MAX_STORE = BytesPerLong; | |
3422 | |
3423 if (is_complete()) | |
3424 return FAIL; // arraycopy got here first; punt | |
3425 | |
3426 assert(allocation() != NULL, "must be present"); | |
3427 | |
3428 // no negatives, no header fields: | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
82
diff
changeset
|
3429 if (start < (intptr_t) allocation()->minimum_header_size()) return FAIL; |
0 | 3430 |
3431 // after a certain size, we bail out on tracking all the stores: | |
3432 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
3433 if (start >= ti_limit) return FAIL; | |
3434 | |
3435 for (uint i = InitializeNode::RawStores, limit = req(); ; ) { | |
3436 if (i >= limit) return -(int)i; // not found; here is where to put it | |
3437 | |
3438 Node* st = in(i); | |
3439 intptr_t st_off = get_store_offset(st, phase); | |
3440 if (st_off < 0) { | |
3441 if (st != zero_memory()) { | |
3442 return FAIL; // bail out if there is dead garbage | |
3443 } | |
3444 } else if (st_off > start) { | |
3445 // ...we are done, since stores are ordered | |
3446 if (st_off < start + size_in_bytes) { | |
3447 return FAIL; // the next store overlaps | |
3448 } | |
3449 return -(int)i; // not found; here is where to put it | |
3450 } else if (st_off < start) { | |
3451 if (size_in_bytes != 0 && | |
3452 start < st_off + MAX_STORE && | |
3453 start < st_off + st->as_Store()->memory_size()) { | |
3454 return FAIL; // the previous store overlaps | |
3455 } | |
3456 } else { | |
3457 if (size_in_bytes != 0 && | |
3458 st->as_Store()->memory_size() != size_in_bytes) { | |
3459 return FAIL; // mismatched store size | |
3460 } | |
3461 return i; | |
3462 } | |
3463 | |
3464 ++i; | |
3465 } | |
3466 } | |
3467 | |
3468 // Look for a captured store which initializes at the offset 'start' | |
3469 // with the given size. If there is no such store, and no other | |
3470 // initialization interferes, then return zero_memory (the memory | |
3471 // projection of the AllocateNode). | |
3472 Node* InitializeNode::find_captured_store(intptr_t start, int size_in_bytes, | |
3473 PhaseTransform* phase) { | |
3474 assert(stores_are_sane(phase), ""); | |
3475 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
3476 if (i == 0) { | |
3477 return NULL; // something is dead | |
3478 } else if (i < 0) { | |
3479 return zero_memory(); // just primordial zero bits here | |
3480 } else { | |
3481 Node* st = in(i); // here is the store at this position | |
3482 assert(get_store_offset(st->as_Store(), phase) == start, "sanity"); | |
3483 return st; | |
3484 } | |
3485 } | |
3486 | |
3487 // Create, as a raw pointer, an address within my new object at 'offset'. | |
3488 Node* InitializeNode::make_raw_address(intptr_t offset, | |
3489 PhaseTransform* phase) { | |
3490 Node* addr = in(RawAddress); | |
3491 if (offset != 0) { | |
3492 Compile* C = phase->C; | |
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3493 addr = phase->transform( new (C) AddPNode(C->top(), addr, |
0 | 3494 phase->MakeConX(offset)) ); |
3495 } | |
3496 return addr; | |
3497 } | |
3498 | |
3499 // Clone the given store, converting it into a raw store | |
3500 // initializing a field or element of my new object. | |
3501 // Caller is responsible for retiring the original store, | |
3502 // with subsume_node or the like. | |
3503 // | |
3504 // From the example above InitializeNode::InitializeNode, | |
3505 // here are the old stores to be captured: | |
3506 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
3507 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
3508 // | |
3509 // Here is the changed code; note the extra edges on init: | |
3510 // alloc = (Allocate ...) | |
3511 // rawoop = alloc.RawAddress | |
3512 // rawstore1 = (StoreC alloc.Control alloc.Memory (+ rawoop 12) 1) | |
3513 // rawstore2 = (StoreC alloc.Control alloc.Memory (+ rawoop 14) 2) | |
3514 // init = (Initialize alloc.Control alloc.Memory rawoop | |
3515 // rawstore1 rawstore2) | |
3516 // | |
3517 Node* InitializeNode::capture_store(StoreNode* st, intptr_t start, | |
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3518 PhaseTransform* phase, bool can_reshape) { |
0 | 3519 assert(stores_are_sane(phase), ""); |
3520 | |
3521 if (start < 0) return NULL; | |
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3522 assert(can_capture_store(st, phase, can_reshape) == start, "sanity"); |
0 | 3523 |
3524 Compile* C = phase->C; | |
3525 int size_in_bytes = st->memory_size(); | |
3526 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
3527 if (i == 0) return NULL; // bail out | |
3528 Node* prev_mem = NULL; // raw memory for the captured store | |
3529 if (i > 0) { | |
3530 prev_mem = in(i); // there is a pre-existing store under this one | |
3531 set_req(i, C->top()); // temporarily disconnect it | |
3532 // See StoreNode::Ideal 'st->outcnt() == 1' for the reason to disconnect. | |
3533 } else { | |
3534 i = -i; // no pre-existing store | |
3535 prev_mem = zero_memory(); // a slice of the newly allocated object | |
3536 if (i > InitializeNode::RawStores && in(i-1) == prev_mem) | |
3537 set_req(--i, C->top()); // reuse this edge; it has been folded away | |
3538 else | |
3539 ins_req(i, C->top()); // build a new edge | |
3540 } | |
3541 Node* new_st = st->clone(); | |
3542 new_st->set_req(MemNode::Control, in(Control)); | |
3543 new_st->set_req(MemNode::Memory, prev_mem); | |
3544 new_st->set_req(MemNode::Address, make_raw_address(start, phase)); | |
3545 new_st = phase->transform(new_st); | |
3546 | |
3547 // At this point, new_st might have swallowed a pre-existing store | |
3548 // at the same offset, or perhaps new_st might have disappeared, | |
3549 // if it redundantly stored the same value (or zero to fresh memory). | |
3550 | |
3551 // In any case, wire it in: | |
3552 set_req(i, new_st); | |
3553 | |
3554 // The caller may now kill the old guy. | |
3555 DEBUG_ONLY(Node* check_st = find_captured_store(start, size_in_bytes, phase)); | |
3556 assert(check_st == new_st || check_st == NULL, "must be findable"); | |
3557 assert(!is_complete(), ""); | |
3558 return new_st; | |
3559 } | |
3560 | |
3561 static bool store_constant(jlong* tiles, int num_tiles, | |
3562 intptr_t st_off, int st_size, | |
3563 jlong con) { | |
3564 if ((st_off & (st_size-1)) != 0) | |
3565 return false; // strange store offset (assume size==2**N) | |
3566 address addr = (address)tiles + st_off; | |
3567 assert(st_off >= 0 && addr+st_size <= (address)&tiles[num_tiles], "oob"); | |
3568 switch (st_size) { | |
3569 case sizeof(jbyte): *(jbyte*) addr = (jbyte) con; break; | |
3570 case sizeof(jchar): *(jchar*) addr = (jchar) con; break; | |
3571 case sizeof(jint): *(jint*) addr = (jint) con; break; | |
3572 case sizeof(jlong): *(jlong*) addr = (jlong) con; break; | |
3573 default: return false; // strange store size (detect size!=2**N here) | |
3574 } | |
3575 return true; // return success to caller | |
3576 } | |
3577 | |
3578 // Coalesce subword constants into int constants and possibly | |
3579 // into long constants. The goal, if the CPU permits, | |
3580 // is to initialize the object with a small number of 64-bit tiles. | |
3581 // Also, convert floating-point constants to bit patterns. | |
3582 // Non-constants are not relevant to this pass. | |
3583 // | |
3584 // In terms of the running example on InitializeNode::InitializeNode | |
3585 // and InitializeNode::capture_store, here is the transformation | |
3586 // of rawstore1 and rawstore2 into rawstore12: | |
3587 // alloc = (Allocate ...) | |
3588 // rawoop = alloc.RawAddress | |
3589 // tile12 = 0x00010002 | |
3590 // rawstore12 = (StoreI alloc.Control alloc.Memory (+ rawoop 12) tile12) | |
3591 // init = (Initialize alloc.Control alloc.Memory rawoop rawstore12) | |
3592 // | |
3593 void | |
3594 InitializeNode::coalesce_subword_stores(intptr_t header_size, | |
3595 Node* size_in_bytes, | |
3596 PhaseGVN* phase) { | |
3597 Compile* C = phase->C; | |
3598 | |
3599 assert(stores_are_sane(phase), ""); | |
3600 // Note: After this pass, they are not completely sane, | |
3601 // since there may be some overlaps. | |
3602 | |
3603 int old_subword = 0, old_long = 0, new_int = 0, new_long = 0; | |
3604 | |
3605 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
3606 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, ti_limit); | |
3607 size_limit = MIN2(size_limit, ti_limit); | |
3608 size_limit = align_size_up(size_limit, BytesPerLong); | |
3609 int num_tiles = size_limit / BytesPerLong; | |
3610 | |
3611 // allocate space for the tile map: | |
3612 const int small_len = DEBUG_ONLY(true ? 3 :) 30; // keep stack frames small | |
3613 jlong tiles_buf[small_len]; | |
3614 Node* nodes_buf[small_len]; | |
3615 jlong inits_buf[small_len]; | |
3616 jlong* tiles = ((num_tiles <= small_len) ? &tiles_buf[0] | |
3617 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
3618 Node** nodes = ((num_tiles <= small_len) ? &nodes_buf[0] | |
3619 : NEW_RESOURCE_ARRAY(Node*, num_tiles)); | |
3620 jlong* inits = ((num_tiles <= small_len) ? &inits_buf[0] | |
3621 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
3622 // tiles: exact bitwise model of all primitive constants | |
3623 // nodes: last constant-storing node subsumed into the tiles model | |
3624 // inits: which bytes (in each tile) are touched by any initializations | |
3625 | |
3626 //// Pass A: Fill in the tile model with any relevant stores. | |
3627 | |
3628 Copy::zero_to_bytes(tiles, sizeof(tiles[0]) * num_tiles); | |
3629 Copy::zero_to_bytes(nodes, sizeof(nodes[0]) * num_tiles); | |
3630 Copy::zero_to_bytes(inits, sizeof(inits[0]) * num_tiles); | |
3631 Node* zmem = zero_memory(); // initially zero memory state | |
3632 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3633 Node* st = in(i); | |
3634 intptr_t st_off = get_store_offset(st, phase); | |
3635 | |
3636 // Figure out the store's offset and constant value: | |
3637 if (st_off < header_size) continue; //skip (ignore header) | |
3638 if (st->in(MemNode::Memory) != zmem) continue; //skip (odd store chain) | |
3639 int st_size = st->as_Store()->memory_size(); | |
3640 if (st_off + st_size > size_limit) break; | |
3641 | |
3642 // Record which bytes are touched, whether by constant or not. | |
3643 if (!store_constant(inits, num_tiles, st_off, st_size, (jlong) -1)) | |
3644 continue; // skip (strange store size) | |
3645 | |
3646 const Type* val = phase->type(st->in(MemNode::ValueIn)); | |
3647 if (!val->singleton()) continue; //skip (non-con store) | |
3648 BasicType type = val->basic_type(); | |
3649 | |
3650 jlong con = 0; | |
3651 switch (type) { | |
3652 case T_INT: con = val->is_int()->get_con(); break; | |
3653 case T_LONG: con = val->is_long()->get_con(); break; | |
3654 case T_FLOAT: con = jint_cast(val->getf()); break; | |
3655 case T_DOUBLE: con = jlong_cast(val->getd()); break; | |
3656 default: continue; //skip (odd store type) | |
3657 } | |
3658 | |
3659 if (type == T_LONG && Matcher::isSimpleConstant64(con) && | |
3660 st->Opcode() == Op_StoreL) { | |
3661 continue; // This StoreL is already optimal. | |
3662 } | |
3663 | |
3664 // Store down the constant. | |
3665 store_constant(tiles, num_tiles, st_off, st_size, con); | |
3666 | |
3667 intptr_t j = st_off >> LogBytesPerLong; | |
3668 | |
3669 if (type == T_INT && st_size == BytesPerInt | |
3670 && (st_off & BytesPerInt) == BytesPerInt) { | |
3671 jlong lcon = tiles[j]; | |
3672 if (!Matcher::isSimpleConstant64(lcon) && | |
3673 st->Opcode() == Op_StoreI) { | |
3674 // This StoreI is already optimal by itself. | |
3675 jint* intcon = (jint*) &tiles[j]; | |
3676 intcon[1] = 0; // undo the store_constant() | |
3677 | |
3678 // If the previous store is also optimal by itself, back up and | |
3679 // undo the action of the previous loop iteration... if we can. | |
3680 // But if we can't, just let the previous half take care of itself. | |
3681 st = nodes[j]; | |
3682 st_off -= BytesPerInt; | |
3683 con = intcon[0]; | |
3684 if (con != 0 && st != NULL && st->Opcode() == Op_StoreI) { | |
3685 assert(st_off >= header_size, "still ignoring header"); | |
3686 assert(get_store_offset(st, phase) == st_off, "must be"); | |
3687 assert(in(i-1) == zmem, "must be"); | |
3688 DEBUG_ONLY(const Type* tcon = phase->type(st->in(MemNode::ValueIn))); | |
3689 assert(con == tcon->is_int()->get_con(), "must be"); | |
3690 // Undo the effects of the previous loop trip, which swallowed st: | |
3691 intcon[0] = 0; // undo store_constant() | |
3692 set_req(i-1, st); // undo set_req(i, zmem) | |
3693 nodes[j] = NULL; // undo nodes[j] = st | |
3694 --old_subword; // undo ++old_subword | |
3695 } | |
3696 continue; // This StoreI is already optimal. | |
3697 } | |
3698 } | |
3699 | |
3700 // This store is not needed. | |
3701 set_req(i, zmem); | |
3702 nodes[j] = st; // record for the moment | |
3703 if (st_size < BytesPerLong) // something has changed | |
3704 ++old_subword; // includes int/float, but who's counting... | |
3705 else ++old_long; | |
3706 } | |
3707 | |
3708 if ((old_subword + old_long) == 0) | |
3709 return; // nothing more to do | |
3710 | |
3711 //// Pass B: Convert any non-zero tiles into optimal constant stores. | |
3712 // Be sure to insert them before overlapping non-constant stores. | |
3713 // (E.g., byte[] x = { 1,2,y,4 } => x[int 0] = 0x01020004, x[2]=y.) | |
3714 for (int j = 0; j < num_tiles; j++) { | |
3715 jlong con = tiles[j]; | |
3716 jlong init = inits[j]; | |
3717 if (con == 0) continue; | |
3718 jint con0, con1; // split the constant, address-wise | |
3719 jint init0, init1; // split the init map, address-wise | |
3720 { union { jlong con; jint intcon[2]; } u; | |
3721 u.con = con; | |
3722 con0 = u.intcon[0]; | |
3723 con1 = u.intcon[1]; | |
3724 u.con = init; | |
3725 init0 = u.intcon[0]; | |
3726 init1 = u.intcon[1]; | |
3727 } | |
3728 | |
3729 Node* old = nodes[j]; | |
3730 assert(old != NULL, "need the prior store"); | |
3731 intptr_t offset = (j * BytesPerLong); | |
3732 | |
3733 bool split = !Matcher::isSimpleConstant64(con); | |
3734 | |
3735 if (offset < header_size) { | |
3736 assert(offset + BytesPerInt >= header_size, "second int counts"); | |
3737 assert(*(jint*)&tiles[j] == 0, "junk in header"); | |
3738 split = true; // only the second word counts | |
3739 // Example: int a[] = { 42 ... } | |
3740 } else if (con0 == 0 && init0 == -1) { | |
3741 split = true; // first word is covered by full inits | |
3742 // Example: int a[] = { ... foo(), 42 ... } | |
3743 } else if (con1 == 0 && init1 == -1) { | |
3744 split = true; // second word is covered by full inits | |
3745 // Example: int a[] = { ... 42, foo() ... } | |
3746 } | |
3747 | |
3748 // Here's a case where init0 is neither 0 nor -1: | |
3749 // byte a[] = { ... 0,0,foo(),0, 0,0,0,42 ... } | |
3750 // Assuming big-endian memory, init0, init1 are 0x0000FF00, 0x000000FF. | |
3751 // In this case the tile is not split; it is (jlong)42. | |
3752 // The big tile is stored down, and then the foo() value is inserted. | |
3753 // (If there were foo(),foo() instead of foo(),0, init0 would be -1.) | |
3754 | |
3755 Node* ctl = old->in(MemNode::Control); | |
3756 Node* adr = make_raw_address(offset, phase); | |
3757 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
3758 | |
3759 // One or two coalesced stores to plop down. | |
3760 Node* st[2]; | |
3761 intptr_t off[2]; | |
3762 int nst = 0; | |
3763 if (!split) { | |
3764 ++new_long; | |
3765 off[nst] = offset; | |
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3766 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
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3767 phase->longcon(con), T_LONG, MemNode::unordered); |
0 | 3768 } else { |
3769 // Omit either if it is a zero. | |
3770 if (con0 != 0) { | |
3771 ++new_int; | |
3772 off[nst] = offset; | |
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3773 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
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3774 phase->intcon(con0), T_INT, MemNode::unordered); |
0 | 3775 } |
3776 if (con1 != 0) { | |
3777 ++new_int; | |
3778 offset += BytesPerInt; | |
3779 adr = make_raw_address(offset, phase); | |
3780 off[nst] = offset; | |
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3781 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
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3782 phase->intcon(con1), T_INT, MemNode::unordered); |
0 | 3783 } |
3784 } | |
3785 | |
3786 // Insert second store first, then the first before the second. | |
3787 // Insert each one just before any overlapping non-constant stores. | |
3788 while (nst > 0) { | |
3789 Node* st1 = st[--nst]; | |
3790 C->copy_node_notes_to(st1, old); | |
3791 st1 = phase->transform(st1); | |
3792 offset = off[nst]; | |
3793 assert(offset >= header_size, "do not smash header"); | |
3794 int ins_idx = captured_store_insertion_point(offset, /*size:*/0, phase); | |
3795 guarantee(ins_idx != 0, "must re-insert constant store"); | |
3796 if (ins_idx < 0) ins_idx = -ins_idx; // never overlap | |
3797 if (ins_idx > InitializeNode::RawStores && in(ins_idx-1) == zmem) | |
3798 set_req(--ins_idx, st1); | |
3799 else | |
3800 ins_req(ins_idx, st1); | |
3801 } | |
3802 } | |
3803 | |
3804 if (PrintCompilation && WizardMode) | |
3805 tty->print_cr("Changed %d/%d subword/long constants into %d/%d int/long", | |
3806 old_subword, old_long, new_int, new_long); | |
3807 if (C->log() != NULL) | |
3808 C->log()->elem("comment that='%d/%d subword/long to %d/%d int/long'", | |
3809 old_subword, old_long, new_int, new_long); | |
3810 | |
3811 // Clean up any remaining occurrences of zmem: | |
3812 remove_extra_zeroes(); | |
3813 } | |
3814 | |
3815 // Explore forward from in(start) to find the first fully initialized | |
3816 // word, and return its offset. Skip groups of subword stores which | |
3817 // together initialize full words. If in(start) is itself part of a | |
3818 // fully initialized word, return the offset of in(start). If there | |
3819 // are no following full-word stores, or if something is fishy, return | |
3820 // a negative value. | |
3821 intptr_t InitializeNode::find_next_fullword_store(uint start, PhaseGVN* phase) { | |
3822 int int_map = 0; | |
3823 intptr_t int_map_off = 0; | |
3824 const int FULL_MAP = right_n_bits(BytesPerInt); // the int_map we hope for | |
3825 | |
3826 for (uint i = start, limit = req(); i < limit; i++) { | |
3827 Node* st = in(i); | |
3828 | |
3829 intptr_t st_off = get_store_offset(st, phase); | |
3830 if (st_off < 0) break; // return conservative answer | |
3831 | |
3832 int st_size = st->as_Store()->memory_size(); | |
3833 if (st_size >= BytesPerInt && (st_off % BytesPerInt) == 0) { | |
3834 return st_off; // we found a complete word init | |
3835 } | |
3836 | |
3837 // update the map: | |
3838 | |
3839 intptr_t this_int_off = align_size_down(st_off, BytesPerInt); | |
3840 if (this_int_off != int_map_off) { | |
3841 // reset the map: | |
3842 int_map = 0; | |
3843 int_map_off = this_int_off; | |
3844 } | |
3845 | |
3846 int subword_off = st_off - this_int_off; | |
3847 int_map |= right_n_bits(st_size) << subword_off; | |
3848 if ((int_map & FULL_MAP) == FULL_MAP) { | |
3849 return this_int_off; // we found a complete word init | |
3850 } | |
3851 | |
3852 // Did this store hit or cross the word boundary? | |
3853 intptr_t next_int_off = align_size_down(st_off + st_size, BytesPerInt); | |
3854 if (next_int_off == this_int_off + BytesPerInt) { | |
3855 // We passed the current int, without fully initializing it. | |
3856 int_map_off = next_int_off; | |
3857 int_map >>= BytesPerInt; | |
3858 } else if (next_int_off > this_int_off + BytesPerInt) { | |
3859 // We passed the current and next int. | |
3860 return this_int_off + BytesPerInt; | |
3861 } | |
3862 } | |
3863 | |
3864 return -1; | |
3865 } | |
3866 | |
3867 | |
3868 // Called when the associated AllocateNode is expanded into CFG. | |
3869 // At this point, we may perform additional optimizations. | |
3870 // Linearize the stores by ascending offset, to make memory | |
3871 // activity as coherent as possible. | |
3872 Node* InitializeNode::complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
3873 intptr_t header_size, | |
3874 Node* size_in_bytes, | |
3875 PhaseGVN* phase) { | |
3876 assert(!is_complete(), "not already complete"); | |
3877 assert(stores_are_sane(phase), ""); | |
3878 assert(allocation() != NULL, "must be present"); | |
3879 | |
3880 remove_extra_zeroes(); | |
3881 | |
3882 if (ReduceFieldZeroing || ReduceBulkZeroing) | |
3883 // reduce instruction count for common initialization patterns | |
3884 coalesce_subword_stores(header_size, size_in_bytes, phase); | |
3885 | |
3886 Node* zmem = zero_memory(); // initially zero memory state | |
3887 Node* inits = zmem; // accumulating a linearized chain of inits | |
3888 #ifdef ASSERT | |
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3889 intptr_t first_offset = allocation()->minimum_header_size(); |
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3890 intptr_t last_init_off = first_offset; // previous init offset |
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3891 intptr_t last_init_end = first_offset; // previous init offset+size |
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3892 intptr_t last_tile_end = first_offset; // previous tile offset+size |
0 | 3893 #endif |
3894 intptr_t zeroes_done = header_size; | |
3895 | |
3896 bool do_zeroing = true; // we might give up if inits are very sparse | |
3897 int big_init_gaps = 0; // how many large gaps have we seen? | |
3898 | |
3899 if (ZeroTLAB) do_zeroing = false; | |
3900 if (!ReduceFieldZeroing && !ReduceBulkZeroing) do_zeroing = false; | |
3901 | |
3902 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3903 Node* st = in(i); | |
3904 intptr_t st_off = get_store_offset(st, phase); | |
3905 if (st_off < 0) | |
3906 break; // unknown junk in the inits | |
3907 if (st->in(MemNode::Memory) != zmem) | |
3908 break; // complicated store chains somehow in list | |
3909 | |
3910 int st_size = st->as_Store()->memory_size(); | |
3911 intptr_t next_init_off = st_off + st_size; | |
3912 | |
3913 if (do_zeroing && zeroes_done < next_init_off) { | |
3914 // See if this store needs a zero before it or under it. | |
3915 intptr_t zeroes_needed = st_off; | |
3916 | |
3917 if (st_size < BytesPerInt) { | |
3918 // Look for subword stores which only partially initialize words. | |
3919 // If we find some, we must lay down some word-level zeroes first, | |
3920 // underneath the subword stores. | |
3921 // | |
3922 // Examples: | |
3923 // byte[] a = { p,q,r,s } => a[0]=p,a[1]=q,a[2]=r,a[3]=s | |
3924 // byte[] a = { x,y,0,0 } => a[0..3] = 0, a[0]=x,a[1]=y | |
3925 // byte[] a = { 0,0,z,0 } => a[0..3] = 0, a[2]=z | |
3926 // | |
3927 // Note: coalesce_subword_stores may have already done this, | |
3928 // if it was prompted by constant non-zero subword initializers. | |
3929 // But this case can still arise with non-constant stores. | |
3930 | |
3931 intptr_t next_full_store = find_next_fullword_store(i, phase); | |
3932 | |
3933 // In the examples above: | |
3934 // in(i) p q r s x y z | |
3935 // st_off 12 13 14 15 12 13 14 | |
3936 // st_size 1 1 1 1 1 1 1 | |
3937 // next_full_s. 12 16 16 16 16 16 16 | |
3938 // z's_done 12 16 16 16 12 16 12 | |
3939 // z's_needed 12 16 16 16 16 16 16 | |
3940 // zsize 0 0 0 0 4 0 4 | |
3941 if (next_full_store < 0) { | |
3942 // Conservative tack: Zero to end of current word. | |
3943 zeroes_needed = align_size_up(zeroes_needed, BytesPerInt); | |
3944 } else { | |
3945 // Zero to beginning of next fully initialized word. | |
3946 // Or, don't zero at all, if we are already in that word. | |
3947 assert(next_full_store >= zeroes_needed, "must go forward"); | |
3948 assert((next_full_store & (BytesPerInt-1)) == 0, "even boundary"); | |
3949 zeroes_needed = next_full_store; | |
3950 } | |
3951 } | |
3952 | |
3953 if (zeroes_needed > zeroes_done) { | |
3954 intptr_t zsize = zeroes_needed - zeroes_done; | |
3955 // Do some incremental zeroing on rawmem, in parallel with inits. | |
3956 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3957 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3958 zeroes_done, zeroes_needed, | |
3959 phase); | |
3960 zeroes_done = zeroes_needed; | |
3961 if (zsize > Matcher::init_array_short_size && ++big_init_gaps > 2) | |
3962 do_zeroing = false; // leave the hole, next time | |
3963 } | |
3964 } | |
3965 | |
3966 // Collect the store and move on: | |
3967 st->set_req(MemNode::Memory, inits); | |
3968 inits = st; // put it on the linearized chain | |
3969 set_req(i, zmem); // unhook from previous position | |
3970 | |
3971 if (zeroes_done == st_off) | |
3972 zeroes_done = next_init_off; | |
3973 | |
3974 assert(!do_zeroing || zeroes_done >= next_init_off, "don't miss any"); | |
3975 | |
3976 #ifdef ASSERT | |
3977 // Various order invariants. Weaker than stores_are_sane because | |
3978 // a large constant tile can be filled in by smaller non-constant stores. | |
3979 assert(st_off >= last_init_off, "inits do not reverse"); | |
3980 last_init_off = st_off; | |
3981 const Type* val = NULL; | |
3982 if (st_size >= BytesPerInt && | |
3983 (val = phase->type(st->in(MemNode::ValueIn)))->singleton() && | |
3984 (int)val->basic_type() < (int)T_OBJECT) { | |
3985 assert(st_off >= last_tile_end, "tiles do not overlap"); | |
3986 assert(st_off >= last_init_end, "tiles do not overwrite inits"); | |
3987 last_tile_end = MAX2(last_tile_end, next_init_off); | |
3988 } else { | |
3989 intptr_t st_tile_end = align_size_up(next_init_off, BytesPerLong); | |
3990 assert(st_tile_end >= last_tile_end, "inits stay with tiles"); | |
3991 assert(st_off >= last_init_end, "inits do not overlap"); | |
3992 last_init_end = next_init_off; // it's a non-tile | |
3993 } | |
3994 #endif //ASSERT | |
3995 } | |
3996 | |
3997 remove_extra_zeroes(); // clear out all the zmems left over | |
3998 add_req(inits); | |
3999 | |
4000 if (!ZeroTLAB) { | |
4001 // If anything remains to be zeroed, zero it all now. | |
4002 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
4003 // if it is the last unused 4 bytes of an instance, forget about it | |
4004 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint); | |
4005 if (zeroes_done + BytesPerLong >= size_limit) { | |
4006 assert(allocation() != NULL, ""); | |
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4007 if (allocation()->Opcode() == Op_Allocate) { |
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|
4008 Node* klass_node = allocation()->in(AllocateNode::KlassNode); |
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diff
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|
4009 ciKlass* k = phase->type(klass_node)->is_klassptr()->klass(); |
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4010 if (zeroes_done == k->layout_helper()) |
4da76e32c0be
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|
4011 zeroes_done = size_limit; |
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|
4012 } |
0 | 4013 } |
4014 if (zeroes_done < size_limit) { | |
4015 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
4016 zeroes_done, size_in_bytes, phase); | |
4017 } | |
4018 } | |
4019 | |
4020 set_complete(phase); | |
4021 return rawmem; | |
4022 } | |
4023 | |
4024 | |
4025 #ifdef ASSERT | |
4026 bool InitializeNode::stores_are_sane(PhaseTransform* phase) { | |
4027 if (is_complete()) | |
4028 return true; // stores could be anything at this point | |
113
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|
4029 assert(allocation() != NULL, "must be present"); |
ba764ed4b6f2
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|
4030 intptr_t last_off = allocation()->minimum_header_size(); |
0 | 4031 for (uint i = InitializeNode::RawStores; i < req(); i++) { |
4032 Node* st = in(i); | |
4033 intptr_t st_off = get_store_offset(st, phase); | |
4034 if (st_off < 0) continue; // ignore dead garbage | |
4035 if (last_off > st_off) { | |
17937
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|
4036 tty->print_cr("*** bad store offset at %d: " INTX_FORMAT " > " INTX_FORMAT, i, last_off, st_off); |
0 | 4037 this->dump(2); |
4038 assert(false, "ascending store offsets"); | |
4039 return false; | |
4040 } | |
4041 last_off = st_off + st->as_Store()->memory_size(); | |
4042 } | |
4043 return true; | |
4044 } | |
4045 #endif //ASSERT | |
4046 | |
4047 | |
4048 | |
4049 | |
4050 //============================MergeMemNode===================================== | |
4051 // | |
4052 // SEMANTICS OF MEMORY MERGES: A MergeMem is a memory state assembled from several | |
4053 // contributing store or call operations. Each contributor provides the memory | |
4054 // state for a particular "alias type" (see Compile::alias_type). For example, | |
4055 // if a MergeMem has an input X for alias category #6, then any memory reference | |
4056 // to alias category #6 may use X as its memory state input, as an exact equivalent | |
4057 // to using the MergeMem as a whole. | |
4058 // Load<6>( MergeMem(<6>: X, ...), p ) <==> Load<6>(X,p) | |
4059 // | |
4060 // (Here, the <N> notation gives the index of the relevant adr_type.) | |
4061 // | |
4062 // In one special case (and more cases in the future), alias categories overlap. | |
4063 // The special alias category "Bot" (Compile::AliasIdxBot) includes all memory | |
4064 // states. Therefore, if a MergeMem has only one contributing input W for Bot, | |
4065 // it is exactly equivalent to that state W: | |
4066 // MergeMem(<Bot>: W) <==> W | |
4067 // | |
4068 // Usually, the merge has more than one input. In that case, where inputs | |
4069 // overlap (i.e., one is Bot), the narrower alias type determines the memory | |
4070 // state for that type, and the wider alias type (Bot) fills in everywhere else: | |
4071 // Load<5>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<5>(W,p) | |
4072 // Load<6>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<6>(X,p) | |
4073 // | |
4074 // A merge can take a "wide" memory state as one of its narrow inputs. | |
4075 // This simply means that the merge observes out only the relevant parts of | |
4076 // the wide input. That is, wide memory states arriving at narrow merge inputs | |
4077 // are implicitly "filtered" or "sliced" as necessary. (This is rare.) | |
4078 // | |
4079 // These rules imply that MergeMem nodes may cascade (via their <Bot> links), | |
4080 // and that memory slices "leak through": | |
4081 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y)) <==> MergeMem(<Bot>: W, <7>: Y) | |
4082 // | |
4083 // But, in such a cascade, repeated memory slices can "block the leak": | |
4084 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y), <7>: Y') <==> MergeMem(<Bot>: W, <7>: Y') | |
4085 // | |
4086 // In the last example, Y is not part of the combined memory state of the | |
4087 // outermost MergeMem. The system must, of course, prevent unschedulable | |
4088 // memory states from arising, so you can be sure that the state Y is somehow | |
4089 // a precursor to state Y'. | |
4090 // | |
4091 // | |
4092 // REPRESENTATION OF MEMORY MERGES: The indexes used to address the Node::in array | |
4093 // of each MergeMemNode array are exactly the numerical alias indexes, including | |
4094 // but not limited to AliasIdxTop, AliasIdxBot, and AliasIdxRaw. The functions | |
4095 // Compile::alias_type (and kin) produce and manage these indexes. | |
4096 // | |
4097 // By convention, the value of in(AliasIdxTop) (i.e., in(1)) is always the top node. | |
4098 // (Note that this provides quick access to the top node inside MergeMem methods, | |
4099 // without the need to reach out via TLS to Compile::current.) | |
4100 // | |
4101 // As a consequence of what was just described, a MergeMem that represents a full | |
4102 // memory state has an edge in(AliasIdxBot) which is a "wide" memory state, | |
4103 // containing all alias categories. | |
4104 // | |
4105 // MergeMem nodes never (?) have control inputs, so in(0) is NULL. | |
4106 // | |
4107 // All other edges in(N) (including in(AliasIdxRaw), which is in(3)) are either | |
4108 // a memory state for the alias type <N>, or else the top node, meaning that | |
4109 // there is no particular input for that alias type. Note that the length of | |
4110 // a MergeMem is variable, and may be extended at any time to accommodate new | |
4111 // memory states at larger alias indexes. When merges grow, they are of course | |
4112 // filled with "top" in the unused in() positions. | |
4113 // | |
4114 // This use of top is named "empty_memory()", or "empty_mem" (no-memory) as a variable. | |
4115 // (Top was chosen because it works smoothly with passes like GCM.) | |
4116 // | |
4117 // For convenience, we hardwire the alias index for TypeRawPtr::BOTTOM. (It is | |
4118 // the type of random VM bits like TLS references.) Since it is always the | |
4119 // first non-Bot memory slice, some low-level loops use it to initialize an | |
4120 // index variable: for (i = AliasIdxRaw; i < req(); i++). | |
4121 // | |
4122 // | |
4123 // ACCESSORS: There is a special accessor MergeMemNode::base_memory which returns | |
4124 // the distinguished "wide" state. The accessor MergeMemNode::memory_at(N) returns | |
4125 // the memory state for alias type <N>, or (if there is no particular slice at <N>, | |
4126 // it returns the base memory. To prevent bugs, memory_at does not accept <Top> | |
4127 // or <Bot> indexes. The iterator MergeMemStream provides robust iteration over | |
4128 // MergeMem nodes or pairs of such nodes, ensuring that the non-top edges are visited. | |
4129 // | |
4130 // %%%% We may get rid of base_memory as a separate accessor at some point; it isn't | |
4131 // really that different from the other memory inputs. An abbreviation called | |
4132 // "bot_memory()" for "memory_at(AliasIdxBot)" would keep code tidy. | |
4133 // | |
4134 // | |
4135 // PARTIAL MEMORY STATES: During optimization, MergeMem nodes may arise that represent | |
4136 // partial memory states. When a Phi splits through a MergeMem, the copy of the Phi | |
4137 // that "emerges though" the base memory will be marked as excluding the alias types | |
4138 // of the other (narrow-memory) copies which "emerged through" the narrow edges: | |
4139 // | |
4140 // Phi<Bot>(U, MergeMem(<Bot>: W, <8>: Y)) | |
4141 // ==Ideal=> MergeMem(<Bot>: Phi<Bot-8>(U, W), Phi<8>(U, Y)) | |
4142 // | |
4143 // This strange "subtraction" effect is necessary to ensure IGVN convergence. | |
4144 // (It is currently unimplemented.) As you can see, the resulting merge is | |
4145 // actually a disjoint union of memory states, rather than an overlay. | |
4146 // | |
4147 | |
4148 //------------------------------MergeMemNode----------------------------------- | |
4149 Node* MergeMemNode::make_empty_memory() { | |
4150 Node* empty_memory = (Node*) Compile::current()->top(); | |
4151 assert(empty_memory->is_top(), "correct sentinel identity"); | |
4152 return empty_memory; | |
4153 } | |
4154 | |
4155 MergeMemNode::MergeMemNode(Node *new_base) : Node(1+Compile::AliasIdxRaw) { | |
4156 init_class_id(Class_MergeMem); | |
4157 // all inputs are nullified in Node::Node(int) | |
4158 // set_input(0, NULL); // no control input | |
4159 | |
4160 // Initialize the edges uniformly to top, for starters. | |
4161 Node* empty_mem = make_empty_memory(); | |
4162 for (uint i = Compile::AliasIdxTop; i < req(); i++) { | |
4163 init_req(i,empty_mem); | |
4164 } | |
4165 assert(empty_memory() == empty_mem, ""); | |
4166 | |
4167 if( new_base != NULL && new_base->is_MergeMem() ) { | |
4168 MergeMemNode* mdef = new_base->as_MergeMem(); | |
4169 assert(mdef->empty_memory() == empty_mem, "consistent sentinels"); | |
4170 for (MergeMemStream mms(this, mdef); mms.next_non_empty2(); ) { | |
4171 mms.set_memory(mms.memory2()); | |
4172 } | |
4173 assert(base_memory() == mdef->base_memory(), ""); | |
4174 } else { | |
4175 set_base_memory(new_base); | |
4176 } | |
4177 } | |
4178 | |
4179 // Make a new, untransformed MergeMem with the same base as 'mem'. | |
4180 // If mem is itself a MergeMem, populate the result with the same edges. | |
4181 MergeMemNode* MergeMemNode::make(Compile* C, Node* mem) { | |
6804
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4182 return new(C) MergeMemNode(mem); |
0 | 4183 } |
4184 | |
4185 //------------------------------cmp-------------------------------------------- | |
4186 uint MergeMemNode::hash() const { return NO_HASH; } | |
4187 uint MergeMemNode::cmp( const Node &n ) const { | |
4188 return (&n == this); // Always fail except on self | |
4189 } | |
4190 | |
4191 //------------------------------Identity--------------------------------------- | |
4192 Node* MergeMemNode::Identity(PhaseTransform *phase) { | |
4193 // Identity if this merge point does not record any interesting memory | |
4194 // disambiguations. | |
4195 Node* base_mem = base_memory(); | |
4196 Node* empty_mem = empty_memory(); | |
4197 if (base_mem != empty_mem) { // Memory path is not dead? | |
4198 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4199 Node* mem = in(i); | |
4200 if (mem != empty_mem && mem != base_mem) { | |
4201 return this; // Many memory splits; no change | |
4202 } | |
4203 } | |
4204 } | |
4205 return base_mem; // No memory splits; ID on the one true input | |
4206 } | |
4207 | |
4208 //------------------------------Ideal------------------------------------------ | |
4209 // This method is invoked recursively on chains of MergeMem nodes | |
4210 Node *MergeMemNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
4211 // Remove chain'd MergeMems | |
4212 // | |
4213 // This is delicate, because the each "in(i)" (i >= Raw) is interpreted | |
4214 // relative to the "in(Bot)". Since we are patching both at the same time, | |
4215 // we have to be careful to read each "in(i)" relative to the old "in(Bot)", | |
4216 // but rewrite each "in(i)" relative to the new "in(Bot)". | |
4217 Node *progress = NULL; | |
4218 | |
4219 | |
4220 Node* old_base = base_memory(); | |
4221 Node* empty_mem = empty_memory(); | |
4222 if (old_base == empty_mem) | |
4223 return NULL; // Dead memory path. | |
4224 | |
4225 MergeMemNode* old_mbase; | |
4226 if (old_base != NULL && old_base->is_MergeMem()) | |
4227 old_mbase = old_base->as_MergeMem(); | |
4228 else | |
4229 old_mbase = NULL; | |
4230 Node* new_base = old_base; | |
4231 | |
4232 // simplify stacked MergeMems in base memory | |
4233 if (old_mbase) new_base = old_mbase->base_memory(); | |
4234 | |
4235 // the base memory might contribute new slices beyond my req() | |
4236 if (old_mbase) grow_to_match(old_mbase); | |
4237 | |
4238 // Look carefully at the base node if it is a phi. | |
4239 PhiNode* phi_base; | |
4240 if (new_base != NULL && new_base->is_Phi()) | |
4241 phi_base = new_base->as_Phi(); | |
4242 else | |
4243 phi_base = NULL; | |
4244 | |
4245 Node* phi_reg = NULL; | |
4246 uint phi_len = (uint)-1; | |
4247 if (phi_base != NULL && !phi_base->is_copy()) { | |
4248 // do not examine phi if degraded to a copy | |
4249 phi_reg = phi_base->region(); | |
4250 phi_len = phi_base->req(); | |
4251 // see if the phi is unfinished | |
4252 for (uint i = 1; i < phi_len; i++) { | |
4253 if (phi_base->in(i) == NULL) { | |
4254 // incomplete phi; do not look at it yet! | |
4255 phi_reg = NULL; | |
4256 phi_len = (uint)-1; | |
4257 break; | |
4258 } | |
4259 } | |
4260 } | |
4261 | |
4262 // Note: We do not call verify_sparse on entry, because inputs | |
4263 // can normalize to the base_memory via subsume_node or similar | |
4264 // mechanisms. This method repairs that damage. | |
4265 | |
4266 assert(!old_mbase || old_mbase->is_empty_memory(empty_mem), "consistent sentinels"); | |
4267 | |
4268 // Look at each slice. | |
4269 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4270 Node* old_in = in(i); | |
4271 // calculate the old memory value | |
4272 Node* old_mem = old_in; | |
4273 if (old_mem == empty_mem) old_mem = old_base; | |
4274 assert(old_mem == memory_at(i), ""); | |
4275 | |
4276 // maybe update (reslice) the old memory value | |
4277 | |
4278 // simplify stacked MergeMems | |
4279 Node* new_mem = old_mem; | |
4280 MergeMemNode* old_mmem; | |
4281 if (old_mem != NULL && old_mem->is_MergeMem()) | |
4282 old_mmem = old_mem->as_MergeMem(); | |
4283 else | |
4284 old_mmem = NULL; | |
4285 if (old_mmem == this) { | |
4286 // This can happen if loops break up and safepoints disappear. | |
4287 // A merge of BotPtr (default) with a RawPtr memory derived from a | |
4288 // safepoint can be rewritten to a merge of the same BotPtr with | |
4289 // the BotPtr phi coming into the loop. If that phi disappears | |
4290 // also, we can end up with a self-loop of the mergemem. | |
4291 // In general, if loops degenerate and memory effects disappear, | |
4292 // a mergemem can be left looking at itself. This simply means | |
4293 // that the mergemem's default should be used, since there is | |
4294 // no longer any apparent effect on this slice. | |
4295 // Note: If a memory slice is a MergeMem cycle, it is unreachable | |
4296 // from start. Update the input to TOP. | |
4297 new_mem = (new_base == this || new_base == empty_mem)? empty_mem : new_base; | |
4298 } | |
4299 else if (old_mmem != NULL) { | |
4300 new_mem = old_mmem->memory_at(i); | |
4301 } | |
605 | 4302 // else preceding memory was not a MergeMem |
0 | 4303 |
4304 // replace equivalent phis (unfortunately, they do not GVN together) | |
4305 if (new_mem != NULL && new_mem != new_base && | |
4306 new_mem->req() == phi_len && new_mem->in(0) == phi_reg) { | |
4307 if (new_mem->is_Phi()) { | |
4308 PhiNode* phi_mem = new_mem->as_Phi(); | |
4309 for (uint i = 1; i < phi_len; i++) { | |
4310 if (phi_base->in(i) != phi_mem->in(i)) { | |
4311 phi_mem = NULL; | |
4312 break; | |
4313 } | |
4314 } | |
4315 if (phi_mem != NULL) { | |
4316 // equivalent phi nodes; revert to the def | |
4317 new_mem = new_base; | |
4318 } | |
4319 } | |
4320 } | |
4321 | |
4322 // maybe store down a new value | |
4323 Node* new_in = new_mem; | |
4324 if (new_in == new_base) new_in = empty_mem; | |
4325 | |
4326 if (new_in != old_in) { | |
4327 // Warning: Do not combine this "if" with the previous "if" | |
4328 // A memory slice might have be be rewritten even if it is semantically | |
4329 // unchanged, if the base_memory value has changed. | |
4330 set_req(i, new_in); | |
4331 progress = this; // Report progress | |
4332 } | |
4333 } | |
4334 | |
4335 if (new_base != old_base) { | |
4336 set_req(Compile::AliasIdxBot, new_base); | |
4337 // Don't use set_base_memory(new_base), because we need to update du. | |
4338 assert(base_memory() == new_base, ""); | |
4339 progress = this; | |
4340 } | |
4341 | |
4342 if( base_memory() == this ) { | |
4343 // a self cycle indicates this memory path is dead | |
4344 set_req(Compile::AliasIdxBot, empty_mem); | |
4345 } | |
4346 | |
4347 // Resolve external cycles by calling Ideal on a MergeMem base_memory | |
4348 // Recursion must occur after the self cycle check above | |
4349 if( base_memory()->is_MergeMem() ) { | |
4350 MergeMemNode *new_mbase = base_memory()->as_MergeMem(); | |
4351 Node *m = phase->transform(new_mbase); // Rollup any cycles | |
4352 if( m != NULL && (m->is_top() || | |
4353 m->is_MergeMem() && m->as_MergeMem()->base_memory() == empty_mem) ) { | |
4354 // propagate rollup of dead cycle to self | |
4355 set_req(Compile::AliasIdxBot, empty_mem); | |
4356 } | |
4357 } | |
4358 | |
4359 if( base_memory() == empty_mem ) { | |
4360 progress = this; | |
4361 // Cut inputs during Parse phase only. | |
4362 // During Optimize phase a dead MergeMem node will be subsumed by Top. | |
4363 if( !can_reshape ) { | |
4364 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4365 if( in(i) != empty_mem ) { set_req(i, empty_mem); } | |
4366 } | |
4367 } | |
4368 } | |
4369 | |
4370 if( !progress && base_memory()->is_Phi() && can_reshape ) { | |
4371 // Check if PhiNode::Ideal's "Split phis through memory merges" | |
4372 // transform should be attempted. Look for this->phi->this cycle. | |
4373 uint merge_width = req(); | |
4374 if (merge_width > Compile::AliasIdxRaw) { | |
4375 PhiNode* phi = base_memory()->as_Phi(); | |
4376 for( uint i = 1; i < phi->req(); ++i ) {// For all paths in | |
4377 if (phi->in(i) == this) { | |
4378 phase->is_IterGVN()->_worklist.push(phi); | |
4379 break; | |
4380 } | |
4381 } | |
4382 } | |
4383 } | |
4384 | |
64
b8f5ba577b02
6673473: (Escape Analysis) Add the instance's field information to PhiNode
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parents:
43
diff
changeset
|
4385 assert(progress || verify_sparse(), "please, no dups of base"); |
0 | 4386 return progress; |
4387 } | |
4388 | |
4389 //-------------------------set_base_memory------------------------------------- | |
4390 void MergeMemNode::set_base_memory(Node *new_base) { | |
4391 Node* empty_mem = empty_memory(); | |
4392 set_req(Compile::AliasIdxBot, new_base); | |
4393 assert(memory_at(req()) == new_base, "must set default memory"); | |
4394 // Clear out other occurrences of new_base: | |
4395 if (new_base != empty_mem) { | |
4396 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4397 if (in(i) == new_base) set_req(i, empty_mem); | |
4398 } | |
4399 } | |
4400 } | |
4401 | |
4402 //------------------------------out_RegMask------------------------------------ | |
4403 const RegMask &MergeMemNode::out_RegMask() const { | |
4404 return RegMask::Empty; | |
4405 } | |
4406 | |
4407 //------------------------------dump_spec-------------------------------------- | |
4408 #ifndef PRODUCT | |
4409 void MergeMemNode::dump_spec(outputStream *st) const { | |
4410 st->print(" {"); | |
4411 Node* base_mem = base_memory(); | |
4412 for( uint i = Compile::AliasIdxRaw; i < req(); i++ ) { | |
4413 Node* mem = memory_at(i); | |
4414 if (mem == base_mem) { st->print(" -"); continue; } | |
4415 st->print( " N%d:", mem->_idx ); | |
4416 Compile::current()->get_adr_type(i)->dump_on(st); | |
4417 } | |
4418 st->print(" }"); | |
4419 } | |
4420 #endif // !PRODUCT | |
4421 | |
4422 | |
4423 #ifdef ASSERT | |
4424 static bool might_be_same(Node* a, Node* b) { | |
4425 if (a == b) return true; | |
4426 if (!(a->is_Phi() || b->is_Phi())) return false; | |
4427 // phis shift around during optimization | |
4428 return true; // pretty stupid... | |
4429 } | |
4430 | |
4431 // verify a narrow slice (either incoming or outgoing) | |
4432 static void verify_memory_slice(const MergeMemNode* m, int alias_idx, Node* n) { | |
4433 if (!VerifyAliases) return; // don't bother to verify unless requested | |
4434 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
4435 if (Node::in_dump()) return; // muzzle asserts when printing | |
4436 assert(alias_idx >= Compile::AliasIdxRaw, "must not disturb base_memory or sentinel"); | |
4437 assert(n != NULL, ""); | |
4438 // Elide intervening MergeMem's | |
4439 while (n->is_MergeMem()) { | |
4440 n = n->as_MergeMem()->memory_at(alias_idx); | |
4441 } | |
4442 Compile* C = Compile::current(); | |
4443 const TypePtr* n_adr_type = n->adr_type(); | |
4444 if (n == m->empty_memory()) { | |
4445 // Implicit copy of base_memory() | |
4446 } else if (n_adr_type != TypePtr::BOTTOM) { | |
4447 assert(n_adr_type != NULL, "new memory must have a well-defined adr_type"); | |
4448 assert(C->must_alias(n_adr_type, alias_idx), "new memory must match selected slice"); | |
4449 } else { | |
4450 // A few places like make_runtime_call "know" that VM calls are narrow, | |
4451 // and can be used to update only the VM bits stored as TypeRawPtr::BOTTOM. | |
4452 bool expected_wide_mem = false; | |
4453 if (n == m->base_memory()) { | |
4454 expected_wide_mem = true; | |
4455 } else if (alias_idx == Compile::AliasIdxRaw || | |
4456 n == m->memory_at(Compile::AliasIdxRaw)) { | |
4457 expected_wide_mem = true; | |
4458 } else if (!C->alias_type(alias_idx)->is_rewritable()) { | |
4459 // memory can "leak through" calls on channels that | |
4460 // are write-once. Allow this also. | |
4461 expected_wide_mem = true; | |
4462 } | |
4463 assert(expected_wide_mem, "expected narrow slice replacement"); | |
4464 } | |
4465 } | |
4466 #else // !ASSERT | |
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10278
diff
changeset
|
4467 #define verify_memory_slice(m,i,n) (void)(0) // PRODUCT version is no-op |
0 | 4468 #endif |
4469 | |
4470 | |
4471 //-----------------------------memory_at--------------------------------------- | |
4472 Node* MergeMemNode::memory_at(uint alias_idx) const { | |
4473 assert(alias_idx >= Compile::AliasIdxRaw || | |
4474 alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, | |
4475 "must avoid base_memory and AliasIdxTop"); | |
4476 | |
4477 // Otherwise, it is a narrow slice. | |
4478 Node* n = alias_idx < req() ? in(alias_idx) : empty_memory(); | |
4479 Compile *C = Compile::current(); | |
4480 if (is_empty_memory(n)) { | |
4481 // the array is sparse; empty slots are the "top" node | |
4482 n = base_memory(); | |
4483 assert(Node::in_dump() | |
4484 || 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
|
4485 || n->adr_type() == NULL // address is TOP |
0 | 4486 || n->adr_type() == TypePtr::BOTTOM |
4487 || n->adr_type() == TypeRawPtr::BOTTOM | |
4488 || Compile::current()->AliasLevel() == 0, | |
4489 "must be a wide memory"); | |
4490 // AliasLevel == 0 if we are organizing the memory states manually. | |
4491 // See verify_memory_slice for comments on TypeRawPtr::BOTTOM. | |
4492 } else { | |
4493 // make sure the stored slice is sane | |
4494 #ifdef ASSERT | |
4495 if (is_error_reported() || Node::in_dump()) { | |
4496 } else if (might_be_same(n, base_memory())) { | |
4497 // Give it a pass: It is a mostly harmless repetition of the base. | |
4498 // This can arise normally from node subsumption during optimization. | |
4499 } else { | |
4500 verify_memory_slice(this, alias_idx, n); | |
4501 } | |
4502 #endif | |
4503 } | |
4504 return n; | |
4505 } | |
4506 | |
4507 //---------------------------set_memory_at------------------------------------- | |
4508 void MergeMemNode::set_memory_at(uint alias_idx, Node *n) { | |
4509 verify_memory_slice(this, alias_idx, n); | |
4510 Node* empty_mem = empty_memory(); | |
4511 if (n == base_memory()) n = empty_mem; // collapse default | |
4512 uint need_req = alias_idx+1; | |
4513 if (req() < need_req) { | |
4514 if (n == empty_mem) return; // already the default, so do not grow me | |
4515 // grow the sparse array | |
4516 do { | |
4517 add_req(empty_mem); | |
4518 } while (req() < need_req); | |
4519 } | |
4520 set_req( alias_idx, n ); | |
4521 } | |
4522 | |
4523 | |
4524 | |
4525 //--------------------------iteration_setup------------------------------------ | |
4526 void MergeMemNode::iteration_setup(const MergeMemNode* other) { | |
4527 if (other != NULL) { | |
4528 grow_to_match(other); | |
4529 // invariant: the finite support of mm2 is within mm->req() | |
4530 #ifdef ASSERT | |
4531 for (uint i = req(); i < other->req(); i++) { | |
4532 assert(other->is_empty_memory(other->in(i)), "slice left uncovered"); | |
4533 } | |
4534 #endif | |
4535 } | |
4536 // Replace spurious copies of base_memory by top. | |
4537 Node* base_mem = base_memory(); | |
4538 if (base_mem != NULL && !base_mem->is_top()) { | |
4539 for (uint i = Compile::AliasIdxBot+1, imax = req(); i < imax; i++) { | |
4540 if (in(i) == base_mem) | |
4541 set_req(i, empty_memory()); | |
4542 } | |
4543 } | |
4544 } | |
4545 | |
4546 //---------------------------grow_to_match------------------------------------- | |
4547 void MergeMemNode::grow_to_match(const MergeMemNode* other) { | |
4548 Node* empty_mem = empty_memory(); | |
4549 assert(other->is_empty_memory(empty_mem), "consistent sentinels"); | |
4550 // look for the finite support of the other memory | |
4551 for (uint i = other->req(); --i >= req(); ) { | |
4552 if (other->in(i) != empty_mem) { | |
4553 uint new_len = i+1; | |
4554 while (req() < new_len) add_req(empty_mem); | |
4555 break; | |
4556 } | |
4557 } | |
4558 } | |
4559 | |
4560 //---------------------------verify_sparse------------------------------------- | |
4561 #ifndef PRODUCT | |
4562 bool MergeMemNode::verify_sparse() const { | |
4563 assert(is_empty_memory(make_empty_memory()), "sane sentinel"); | |
4564 Node* base_mem = base_memory(); | |
4565 // The following can happen in degenerate cases, since empty==top. | |
4566 if (is_empty_memory(base_mem)) return true; | |
4567 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4568 assert(in(i) != NULL, "sane slice"); | |
4569 if (in(i) == base_mem) return false; // should have been the sentinel value! | |
4570 } | |
4571 return true; | |
4572 } | |
4573 | |
4574 bool MergeMemStream::match_memory(Node* mem, const MergeMemNode* mm, int idx) { | |
4575 Node* n; | |
4576 n = mm->in(idx); | |
4577 if (mem == n) return true; // might be empty_memory() | |
4578 n = (idx == Compile::AliasIdxBot)? mm->base_memory(): mm->memory_at(idx); | |
4579 if (mem == n) return true; | |
4580 while (n->is_Phi() && (n = n->as_Phi()->is_copy()) != NULL) { | |
4581 if (mem == n) return true; | |
4582 if (n == NULL) break; | |
4583 } | |
4584 return false; | |
4585 } | |
4586 #endif // !PRODUCT |