Mercurial > hg > truffle
annotate src/share/vm/opto/memnode.cpp @ 12355:cefad50507d8
Merge with hs25-b53
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Fri, 11 Oct 2013 10:38:03 +0200 |
| parents | 884ed7a10f09 |
| children | b87211e33ebb 2113136690bc |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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)) { |
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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 |
|
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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())) ) { |
|
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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 |
|
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309 #ifdef ASSERT |
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310 Node* base = NULL; |
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311 if (address->is_AddP()) |
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312 base = address->in(AddPNode::Base); |
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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 Compile* C = phase->C; |
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317 tty->cr(); |
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318 tty->print_cr("===== NULL+offs not RAW address ====="); |
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319 if (C->is_dead_node(this->_idx)) tty->print_cr("'this' is dead"); |
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320 if ((ctl != NULL) && C->is_dead_node(ctl->_idx)) tty->print_cr("'ctl' is dead"); |
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321 if (C->is_dead_node(mem->_idx)) tty->print_cr("'mem' is dead"); |
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322 if (C->is_dead_node(address->_idx)) tty->print_cr("'address' is dead"); |
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323 if (C->is_dead_node(base->_idx)) tty->print_cr("'base' is dead"); |
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324 tty->cr(); |
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325 base->dump(1); |
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326 tty->cr(); |
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327 this->dump(2); |
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328 tty->print("this->adr_type(): "); adr_type()->dump(); tty->cr(); |
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329 tty->print("phase->type(address): "); t_adr->dump(); tty->cr(); |
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330 tty->print("phase->type(base): "); phase->type(address)->dump(); tty->cr(); |
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331 tty->cr(); |
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332 } |
|
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333 assert(base == NULL || t_adr->isa_rawptr() || |
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334 !phase->type(base)->higher_equal(TypePtr::NULL_PTR), "NULL+offs not RAW address?"); |
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335 #endif |
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336 |
| 0 | 337 // Avoid independent memory operations |
| 338 Node* old_mem = mem; | |
| 339 | |
| 36 | 340 // The code which unhooks non-raw memories from complete (macro-expanded) |
| 341 // initializations was removed. After macro-expansion all stores catched | |
| 342 // by Initialize node became raw stores and there is no information | |
| 343 // which memory slices they modify. So it is unsafe to move any memory | |
| 344 // operation above these stores. Also in most cases hooked non-raw memories | |
| 345 // were already unhooked by using information from detect_ptr_independence() | |
| 346 // and find_previous_store(). | |
| 0 | 347 |
| 348 if (mem->is_MergeMem()) { | |
| 349 MergeMemNode* mmem = mem->as_MergeMem(); | |
| 350 const TypePtr *tp = t_adr->is_ptr(); | |
|
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351 |
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352 mem = step_through_mergemem(phase, mmem, tp, adr_type(), tty); |
| 0 | 353 } |
| 354 | |
| 355 if (mem != old_mem) { | |
| 356 set_req(MemNode::Memory, mem); | |
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357 if (can_reshape && old_mem->outcnt() == 0) { |
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358 igvn->_worklist.push(old_mem); |
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359 } |
| 305 | 360 if (phase->type( mem ) == Type::TOP) return NodeSentinel; |
| 0 | 361 return this; |
| 362 } | |
| 363 | |
| 364 // let the subclass continue analyzing... | |
| 365 return NULL; | |
| 366 } | |
| 367 | |
| 368 // Helper function for proving some simple control dominations. | |
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369 // Attempt to prove that all control inputs of 'dom' dominate 'sub'. |
| 0 | 370 // Already assumes that 'dom' is available at 'sub', and that 'sub' |
| 371 // is not a constant (dominated by the method's StartNode). | |
| 372 // Used by MemNode::find_previous_store to prove that the | |
| 373 // control input of a memory operation predates (dominates) | |
| 374 // an allocation it wants to look past. | |
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375 bool MemNode::all_controls_dominate(Node* dom, Node* sub) { |
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376 if (dom == NULL || dom->is_top() || sub == NULL || sub->is_top()) |
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377 return false; // Conservative answer for dead code |
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378 |
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379 // Check 'dom'. Skip Proj and CatchProj nodes. |
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380 dom = dom->find_exact_control(dom); |
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381 if (dom == NULL || dom->is_top()) |
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382 return false; // Conservative answer for dead code |
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383 |
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384 if (dom == sub) { |
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385 // For the case when, for example, 'sub' is Initialize and the original |
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386 // 'dom' is Proj node of the 'sub'. |
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387 return false; |
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388 } |
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389 |
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390 if (dom->is_Con() || dom->is_Start() || dom->is_Root() || dom == sub) |
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391 return true; |
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392 |
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393 // 'dom' dominates 'sub' if its control edge and control edges |
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394 // of all its inputs dominate or equal to sub's control edge. |
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395 |
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396 // Currently 'sub' is either Allocate, Initialize or Start nodes. |
| 163 | 397 // Or Region for the check in LoadNode::Ideal(); |
| 398 // 'sub' should have sub->in(0) != NULL. | |
| 399 assert(sub->is_Allocate() || sub->is_Initialize() || sub->is_Start() || | |
| 10278 | 400 sub->is_Region() || sub->is_Call(), "expecting only these nodes"); |
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401 |
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402 // Get control edge of 'sub'. |
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403 Node* orig_sub = sub; |
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404 sub = sub->find_exact_control(sub->in(0)); |
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405 if (sub == NULL || sub->is_top()) |
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406 return false; // Conservative answer for dead code |
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407 |
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408 assert(sub->is_CFG(), "expecting control"); |
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409 |
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410 if (sub == dom) |
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411 return true; |
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412 |
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413 if (sub->is_Start() || sub->is_Root()) |
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414 return false; |
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415 |
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416 { |
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417 // Check all control edges of 'dom'. |
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418 |
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419 ResourceMark rm; |
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420 Arena* arena = Thread::current()->resource_area(); |
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421 Node_List nlist(arena); |
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422 Unique_Node_List dom_list(arena); |
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423 |
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424 dom_list.push(dom); |
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425 bool only_dominating_controls = false; |
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426 |
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427 for (uint next = 0; next < dom_list.size(); next++) { |
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428 Node* n = dom_list.at(next); |
|
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429 if (n == orig_sub) |
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430 return false; // One of dom's inputs dominated by sub. |
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431 if (!n->is_CFG() && n->pinned()) { |
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432 // Check only own control edge for pinned non-control nodes. |
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433 n = n->find_exact_control(n->in(0)); |
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434 if (n == NULL || n->is_top()) |
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435 return false; // Conservative answer for dead code |
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436 assert(n->is_CFG(), "expecting control"); |
|
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437 dom_list.push(n); |
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438 } else if (n->is_Con() || n->is_Start() || n->is_Root()) { |
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439 only_dominating_controls = true; |
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440 } else if (n->is_CFG()) { |
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441 if (n->dominates(sub, nlist)) |
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442 only_dominating_controls = true; |
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443 else |
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444 return false; |
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445 } else { |
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446 // First, own control edge. |
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447 Node* m = n->find_exact_control(n->in(0)); |
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448 if (m != NULL) { |
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449 if (m->is_top()) |
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450 return false; // Conservative answer for dead code |
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451 dom_list.push(m); |
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452 } |
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453 // Now, the rest of edges. |
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454 uint cnt = n->req(); |
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455 for (uint i = 1; i < cnt; i++) { |
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456 m = n->find_exact_control(n->in(i)); |
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457 if (m == NULL || m->is_top()) |
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458 continue; |
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459 dom_list.push(m); |
| 0 | 460 } |
| 461 } | |
| 462 } | |
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463 return only_dominating_controls; |
| 0 | 464 } |
| 465 } | |
| 466 | |
| 467 //---------------------detect_ptr_independence--------------------------------- | |
| 468 // Used by MemNode::find_previous_store to prove that two base | |
| 469 // pointers are never equal. | |
| 470 // The pointers are accompanied by their associated allocations, | |
| 471 // if any, which have been previously discovered by the caller. | |
| 472 bool MemNode::detect_ptr_independence(Node* p1, AllocateNode* a1, | |
| 473 Node* p2, AllocateNode* a2, | |
| 474 PhaseTransform* phase) { | |
| 475 // Attempt to prove that these two pointers cannot be aliased. | |
| 476 // They may both manifestly be allocations, and they should differ. | |
| 477 // Or, if they are not both allocations, they can be distinct constants. | |
| 478 // Otherwise, one is an allocation and the other a pre-existing value. | |
| 479 if (a1 == NULL && a2 == NULL) { // neither an allocation | |
| 480 return (p1 != p2) && p1->is_Con() && p2->is_Con(); | |
| 481 } else if (a1 != NULL && a2 != NULL) { // both allocations | |
| 482 return (a1 != a2); | |
| 483 } else if (a1 != NULL) { // one allocation a1 | |
| 484 // (Note: p2->is_Con implies p2->in(0)->is_Root, which dominates.) | |
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485 return all_controls_dominate(p2, a1); |
| 0 | 486 } else { //(a2 != NULL) // one allocation a2 |
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487 return all_controls_dominate(p1, a2); |
| 0 | 488 } |
| 489 return false; | |
| 490 } | |
| 491 | |
| 492 | |
| 493 // The logic for reordering loads and stores uses four steps: | |
| 494 // (a) Walk carefully past stores and initializations which we | |
| 495 // can prove are independent of this load. | |
| 496 // (b) Observe that the next memory state makes an exact match | |
| 497 // with self (load or store), and locate the relevant store. | |
| 498 // (c) Ensure that, if we were to wire self directly to the store, | |
| 499 // the optimizer would fold it up somehow. | |
| 500 // (d) Do the rewiring, and return, depending on some other part of | |
| 501 // the optimizer to fold up the load. | |
| 502 // This routine handles steps (a) and (b). Steps (c) and (d) are | |
| 503 // specific to loads and stores, so they are handled by the callers. | |
| 504 // (Currently, only LoadNode::Ideal has steps (c), (d). More later.) | |
| 505 // | |
| 506 Node* MemNode::find_previous_store(PhaseTransform* phase) { | |
| 507 Node* ctrl = in(MemNode::Control); | |
| 508 Node* adr = in(MemNode::Address); | |
| 509 intptr_t offset = 0; | |
| 510 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
| 511 AllocateNode* alloc = AllocateNode::Ideal_allocation(base, phase); | |
| 512 | |
| 513 if (offset == Type::OffsetBot) | |
| 514 return NULL; // cannot unalias unless there are precise offsets | |
| 515 | |
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516 const TypeOopPtr *addr_t = adr->bottom_type()->isa_oopptr(); |
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517 |
| 0 | 518 intptr_t size_in_bytes = memory_size(); |
| 519 | |
| 520 Node* mem = in(MemNode::Memory); // start searching here... | |
| 521 | |
| 522 int cnt = 50; // Cycle limiter | |
| 523 for (;;) { // While we can dance past unrelated stores... | |
| 524 if (--cnt < 0) break; // Caught in cycle or a complicated dance? | |
| 525 | |
| 526 if (mem->is_Store()) { | |
| 527 Node* st_adr = mem->in(MemNode::Address); | |
| 528 intptr_t st_offset = 0; | |
| 529 Node* st_base = AddPNode::Ideal_base_and_offset(st_adr, phase, st_offset); | |
| 530 if (st_base == NULL) | |
| 531 break; // inscrutable pointer | |
| 532 if (st_offset != offset && st_offset != Type::OffsetBot) { | |
| 533 const int MAX_STORE = BytesPerLong; | |
| 534 if (st_offset >= offset + size_in_bytes || | |
| 535 st_offset <= offset - MAX_STORE || | |
| 536 st_offset <= offset - mem->as_Store()->memory_size()) { | |
| 537 // Success: The offsets are provably independent. | |
| 538 // (You may ask, why not just test st_offset != offset and be done? | |
| 539 // The answer is that stores of different sizes can co-exist | |
| 540 // in the same sequence of RawMem effects. We sometimes initialize | |
| 541 // a whole 'tile' of array elements with a single jint or jlong.) | |
| 542 mem = mem->in(MemNode::Memory); | |
| 543 continue; // (a) advance through independent store memory | |
| 544 } | |
| 545 } | |
| 546 if (st_base != base && | |
| 547 detect_ptr_independence(base, alloc, | |
| 548 st_base, | |
| 549 AllocateNode::Ideal_allocation(st_base, phase), | |
| 550 phase)) { | |
| 551 // Success: The bases are provably independent. | |
| 552 mem = mem->in(MemNode::Memory); | |
| 553 continue; // (a) advance through independent store memory | |
| 554 } | |
| 555 | |
| 556 // (b) At this point, if the bases or offsets do not agree, we lose, | |
| 557 // since we have not managed to prove 'this' and 'mem' independent. | |
| 558 if (st_base == base && st_offset == offset) { | |
| 559 return mem; // let caller handle steps (c), (d) | |
| 560 } | |
| 561 | |
| 562 } else if (mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
| 563 InitializeNode* st_init = mem->in(0)->as_Initialize(); | |
| 564 AllocateNode* st_alloc = st_init->allocation(); | |
| 565 if (st_alloc == NULL) | |
| 566 break; // something degenerated | |
| 567 bool known_identical = false; | |
| 568 bool known_independent = false; | |
| 569 if (alloc == st_alloc) | |
| 570 known_identical = true; | |
| 571 else if (alloc != NULL) | |
| 572 known_independent = true; | |
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573 else if (all_controls_dominate(this, st_alloc)) |
| 0 | 574 known_independent = true; |
| 575 | |
| 576 if (known_independent) { | |
| 577 // The bases are provably independent: Either they are | |
| 578 // manifestly distinct allocations, or else the control | |
| 579 // of this load dominates the store's allocation. | |
| 580 int alias_idx = phase->C->get_alias_index(adr_type()); | |
| 581 if (alias_idx == Compile::AliasIdxRaw) { | |
| 582 mem = st_alloc->in(TypeFunc::Memory); | |
| 583 } else { | |
| 584 mem = st_init->memory(alias_idx); | |
| 585 } | |
| 586 continue; // (a) advance through independent store memory | |
| 587 } | |
| 588 | |
| 589 // (b) at this point, if we are not looking at a store initializing | |
| 590 // the same allocation we are loading from, we lose. | |
| 591 if (known_identical) { | |
| 592 // From caller, can_see_stored_value will consult find_captured_store. | |
| 593 return mem; // let caller handle steps (c), (d) | |
| 594 } | |
| 595 | |
| 223 | 596 } else if (addr_t != NULL && addr_t->is_known_instance_field()) { |
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597 // Can't use optimize_simple_memory_chain() since it needs PhaseGVN. |
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598 if (mem->is_Proj() && mem->in(0)->is_Call()) { |
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599 CallNode *call = mem->in(0)->as_Call(); |
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600 if (!call->may_modify(addr_t, phase)) { |
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601 mem = call->in(TypeFunc::Memory); |
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602 continue; // (a) advance through independent call memory |
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603 } |
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604 } else if (mem->is_Proj() && mem->in(0)->is_MemBar()) { |
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605 mem = mem->in(0)->in(TypeFunc::Memory); |
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606 continue; // (a) advance through independent MemBar memory |
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607 } else if (mem->is_ClearArray()) { |
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608 if (ClearArrayNode::step_through(&mem, (uint)addr_t->instance_id(), phase)) { |
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609 // (the call updated 'mem' value) |
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610 continue; // (a) advance through independent allocation memory |
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611 } else { |
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612 // Can not bypass initialization of the instance |
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613 // we are looking for. |
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614 return mem; |
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615 } |
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616 } else if (mem->is_MergeMem()) { |
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617 int alias_idx = phase->C->get_alias_index(adr_type()); |
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618 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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619 continue; // (a) advance through independent MergeMem memory |
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620 } |
| 0 | 621 } |
| 622 | |
| 623 // Unless there is an explicit 'continue', we must bail out here, | |
| 624 // because 'mem' is an inscrutable memory state (e.g., a call). | |
| 625 break; | |
| 626 } | |
| 627 | |
| 628 return NULL; // bail out | |
| 629 } | |
| 630 | |
| 631 //----------------------calculate_adr_type------------------------------------- | |
| 632 // Helper function. Notices when the given type of address hits top or bottom. | |
| 633 // Also, asserts a cross-check of the type against the expected address type. | |
| 634 const TypePtr* MemNode::calculate_adr_type(const Type* t, const TypePtr* cross_check) { | |
| 635 if (t == Type::TOP) return NULL; // does not touch memory any more? | |
| 636 #ifdef PRODUCT | |
| 637 cross_check = NULL; | |
| 638 #else | |
| 639 if (!VerifyAliases || is_error_reported() || Node::in_dump()) cross_check = NULL; | |
| 640 #endif | |
| 641 const TypePtr* tp = t->isa_ptr(); | |
| 642 if (tp == NULL) { | |
| 643 assert(cross_check == NULL || cross_check == TypePtr::BOTTOM, "expected memory type must be wide"); | |
| 644 return TypePtr::BOTTOM; // touches lots of memory | |
| 645 } else { | |
| 646 #ifdef ASSERT | |
| 647 // %%%% [phh] We don't check the alias index if cross_check is | |
| 648 // TypeRawPtr::BOTTOM. Needs to be investigated. | |
| 649 if (cross_check != NULL && | |
| 650 cross_check != TypePtr::BOTTOM && | |
| 651 cross_check != TypeRawPtr::BOTTOM) { | |
| 652 // Recheck the alias index, to see if it has changed (due to a bug). | |
| 653 Compile* C = Compile::current(); | |
| 654 assert(C->get_alias_index(cross_check) == C->get_alias_index(tp), | |
| 655 "must stay in the original alias category"); | |
| 656 // The type of the address must be contained in the adr_type, | |
| 657 // disregarding "null"-ness. | |
| 658 // (We make an exception for TypeRawPtr::BOTTOM, which is a bit bucket.) | |
| 659 const TypePtr* tp_notnull = tp->join(TypePtr::NOTNULL)->is_ptr(); | |
| 660 assert(cross_check->meet(tp_notnull) == cross_check, | |
| 661 "real address must not escape from expected memory type"); | |
| 662 } | |
| 663 #endif | |
| 664 return tp; | |
| 665 } | |
| 666 } | |
| 667 | |
| 668 //------------------------adr_phi_is_loop_invariant---------------------------- | |
| 669 // A helper function for Ideal_DU_postCCP to check if a Phi in a counted | |
| 670 // loop is loop invariant. Make a quick traversal of Phi and associated | |
| 671 // CastPP nodes, looking to see if they are a closed group within the loop. | |
| 672 bool MemNode::adr_phi_is_loop_invariant(Node* adr_phi, Node* cast) { | |
| 673 // The idea is that the phi-nest must boil down to only CastPP nodes | |
| 674 // with the same data. This implies that any path into the loop already | |
| 675 // includes such a CastPP, and so the original cast, whatever its input, | |
| 676 // must be covered by an equivalent cast, with an earlier control input. | |
| 677 ResourceMark rm; | |
| 678 | |
| 679 // The loop entry input of the phi should be the unique dominating | |
| 680 // node for every Phi/CastPP in the loop. | |
| 681 Unique_Node_List closure; | |
| 682 closure.push(adr_phi->in(LoopNode::EntryControl)); | |
| 683 | |
| 684 // Add the phi node and the cast to the worklist. | |
| 685 Unique_Node_List worklist; | |
| 686 worklist.push(adr_phi); | |
| 687 if( cast != NULL ){ | |
| 688 if( !cast->is_ConstraintCast() ) return false; | |
| 689 worklist.push(cast); | |
| 690 } | |
| 691 | |
| 692 // Begin recursive walk of phi nodes. | |
| 693 while( worklist.size() ){ | |
| 694 // Take a node off the worklist | |
| 695 Node *n = worklist.pop(); | |
| 696 if( !closure.member(n) ){ | |
| 697 // Add it to the closure. | |
| 698 closure.push(n); | |
| 699 // Make a sanity check to ensure we don't waste too much time here. | |
| 700 if( closure.size() > 20) return false; | |
| 701 // This node is OK if: | |
| 702 // - it is a cast of an identical value | |
| 703 // - or it is a phi node (then we add its inputs to the worklist) | |
| 704 // Otherwise, the node is not OK, and we presume the cast is not invariant | |
| 705 if( n->is_ConstraintCast() ){ | |
| 706 worklist.push(n->in(1)); | |
| 707 } else if( n->is_Phi() ) { | |
| 708 for( uint i = 1; i < n->req(); i++ ) { | |
| 709 worklist.push(n->in(i)); | |
| 710 } | |
| 711 } else { | |
| 712 return false; | |
| 713 } | |
| 714 } | |
| 715 } | |
| 716 | |
| 717 // Quit when the worklist is empty, and we've found no offending nodes. | |
| 718 return true; | |
| 719 } | |
| 720 | |
| 721 //------------------------------Ideal_DU_postCCP------------------------------- | |
| 722 // Find any cast-away of null-ness and keep its control. Null cast-aways are | |
| 723 // going away in this pass and we need to make this memory op depend on the | |
| 724 // gating null check. | |
| 163 | 725 Node *MemNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
| 726 return Ideal_common_DU_postCCP(ccp, this, in(MemNode::Address)); | |
| 727 } | |
| 0 | 728 |
| 729 // I tried to leave the CastPP's in. This makes the graph more accurate in | |
| 730 // some sense; we get to keep around the knowledge that an oop is not-null | |
| 731 // after some test. Alas, the CastPP's interfere with GVN (some values are | |
| 732 // the regular oop, some are the CastPP of the oop, all merge at Phi's which | |
| 733 // cannot collapse, etc). This cost us 10% on SpecJVM, even when I removed | |
| 734 // some of the more trivial cases in the optimizer. Removing more useless | |
| 735 // Phi's started allowing Loads to illegally float above null checks. I gave | |
| 736 // up on this approach. CNC 10/20/2000 | |
| 163 | 737 // This static method may be called not from MemNode (EncodePNode calls it). |
| 738 // Only the control edge of the node 'n' might be updated. | |
| 739 Node *MemNode::Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr ) { | |
| 0 | 740 Node *skipped_cast = NULL; |
| 741 // Need a null check? Regular static accesses do not because they are | |
| 742 // from constant addresses. Array ops are gated by the range check (which | |
| 743 // always includes a NULL check). Just check field ops. | |
| 163 | 744 if( n->in(MemNode::Control) == NULL ) { |
| 0 | 745 // Scan upwards for the highest location we can place this memory op. |
| 746 while( true ) { | |
| 747 switch( adr->Opcode() ) { | |
| 748 | |
| 749 case Op_AddP: // No change to NULL-ness, so peek thru AddP's | |
| 750 adr = adr->in(AddPNode::Base); | |
| 751 continue; | |
| 752 | |
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753 case Op_DecodeN: // No change to NULL-ness, so peek thru |
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754 case Op_DecodeNKlass: |
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755 adr = adr->in(1); |
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756 continue; |
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757 |
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758 case Op_EncodeP: |
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759 case Op_EncodePKlass: |
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760 // EncodeP node's control edge could be set by this method |
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761 // when EncodeP node depends on CastPP node. |
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762 // |
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763 // Use its control edge for memory op because EncodeP may go away |
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764 // later when it is folded with following or preceding DecodeN node. |
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765 if (adr->in(0) == NULL) { |
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766 // Keep looking for cast nodes. |
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767 adr = adr->in(1); |
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768 continue; |
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769 } |
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770 ccp->hash_delete(n); |
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771 n->set_req(MemNode::Control, adr->in(0)); |
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772 ccp->hash_insert(n); |
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773 return n; |
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774 |
| 0 | 775 case Op_CastPP: |
| 776 // If the CastPP is useless, just peek on through it. | |
| 777 if( ccp->type(adr) == ccp->type(adr->in(1)) ) { | |
| 778 // Remember the cast that we've peeked though. If we peek | |
| 779 // through more than one, then we end up remembering the highest | |
| 780 // one, that is, if in a loop, the one closest to the top. | |
| 781 skipped_cast = adr; | |
| 782 adr = adr->in(1); | |
| 783 continue; | |
| 784 } | |
| 785 // CastPP is going away in this pass! We need this memory op to be | |
| 786 // control-dependent on the test that is guarding the CastPP. | |
| 163 | 787 ccp->hash_delete(n); |
| 788 n->set_req(MemNode::Control, adr->in(0)); | |
| 789 ccp->hash_insert(n); | |
| 790 return n; | |
| 0 | 791 |
| 792 case Op_Phi: | |
| 793 // Attempt to float above a Phi to some dominating point. | |
| 794 if (adr->in(0) != NULL && adr->in(0)->is_CountedLoop()) { | |
| 795 // If we've already peeked through a Cast (which could have set the | |
| 796 // control), we can't float above a Phi, because the skipped Cast | |
| 797 // may not be loop invariant. | |
| 798 if (adr_phi_is_loop_invariant(adr, skipped_cast)) { | |
| 799 adr = adr->in(1); | |
| 800 continue; | |
| 801 } | |
| 802 } | |
| 803 | |
| 804 // Intentional fallthrough! | |
| 805 | |
| 806 // No obvious dominating point. The mem op is pinned below the Phi | |
| 807 // by the Phi itself. If the Phi goes away (no true value is merged) | |
| 808 // then the mem op can float, but not indefinitely. It must be pinned | |
| 809 // behind the controls leading to the Phi. | |
| 810 case Op_CheckCastPP: | |
| 811 // These usually stick around to change address type, however a | |
| 812 // useless one can be elided and we still need to pick up a control edge | |
| 813 if (adr->in(0) == NULL) { | |
| 814 // This CheckCastPP node has NO control and is likely useless. But we | |
| 815 // need check further up the ancestor chain for a control input to keep | |
| 816 // the node in place. 4959717. | |
| 817 skipped_cast = adr; | |
| 818 adr = adr->in(1); | |
| 819 continue; | |
| 820 } | |
| 163 | 821 ccp->hash_delete(n); |
| 822 n->set_req(MemNode::Control, adr->in(0)); | |
| 823 ccp->hash_insert(n); | |
| 824 return n; | |
| 0 | 825 |
| 826 // List of "safe" opcodes; those that implicitly block the memory | |
| 827 // op below any null check. | |
| 828 case Op_CastX2P: // no null checks on native pointers | |
| 829 case Op_Parm: // 'this' pointer is not null | |
| 830 case Op_LoadP: // Loading from within a klass | |
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831 case Op_LoadN: // Loading from within a klass |
| 0 | 832 case Op_LoadKlass: // Loading from within a klass |
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833 case Op_LoadNKlass: // Loading from within a klass |
| 0 | 834 case Op_ConP: // Loading from a klass |
| 163 | 835 case Op_ConN: // Loading from a klass |
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836 case Op_ConNKlass: // Loading from a klass |
| 0 | 837 case Op_CreateEx: // Sucking up the guts of an exception oop |
| 838 case Op_Con: // Reading from TLS | |
| 839 case Op_CMoveP: // CMoveP is pinned | |
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840 case Op_CMoveN: // CMoveN is pinned |
| 0 | 841 break; // No progress |
| 842 | |
| 843 case Op_Proj: // Direct call to an allocation routine | |
| 844 case Op_SCMemProj: // Memory state from store conditional ops | |
| 845 #ifdef ASSERT | |
| 846 { | |
| 847 assert(adr->as_Proj()->_con == TypeFunc::Parms, "must be return value"); | |
| 848 const Node* call = adr->in(0); | |
| 163 | 849 if (call->is_CallJava()) { |
| 850 const CallJavaNode* call_java = call->as_CallJava(); | |
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851 const TypeTuple *r = call_java->tf()->range(); |
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852 assert(r->cnt() > TypeFunc::Parms, "must return value"); |
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853 const Type* ret_type = r->field_at(TypeFunc::Parms); |
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854 assert(ret_type && ret_type->isa_ptr(), "must return pointer"); |
| 0 | 855 // We further presume that this is one of |
| 856 // new_instance_Java, new_array_Java, or | |
| 857 // the like, but do not assert for this. | |
| 858 } else if (call->is_Allocate()) { | |
| 859 // similar case to new_instance_Java, etc. | |
| 860 } else if (!call->is_CallLeaf()) { | |
| 861 // Projections from fetch_oop (OSR) are allowed as well. | |
| 862 ShouldNotReachHere(); | |
| 863 } | |
| 864 } | |
| 865 #endif | |
| 866 break; | |
| 867 default: | |
| 868 ShouldNotReachHere(); | |
| 869 } | |
| 870 break; | |
| 871 } | |
| 872 } | |
| 873 | |
| 874 return NULL; // No progress | |
| 875 } | |
| 876 | |
| 877 | |
| 878 //============================================================================= | |
| 879 uint LoadNode::size_of() const { return sizeof(*this); } | |
| 880 uint LoadNode::cmp( const Node &n ) const | |
| 881 { return !Type::cmp( _type, ((LoadNode&)n)._type ); } | |
| 882 const Type *LoadNode::bottom_type() const { return _type; } | |
| 883 uint LoadNode::ideal_reg() const { | |
|
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884 return _type->ideal_reg(); |
| 0 | 885 } |
| 886 | |
| 887 #ifndef PRODUCT | |
| 888 void LoadNode::dump_spec(outputStream *st) const { | |
| 889 MemNode::dump_spec(st); | |
| 890 if( !Verbose && !WizardMode ) { | |
| 891 // standard dump does this in Verbose and WizardMode | |
| 892 st->print(" #"); _type->dump_on(st); | |
| 893 } | |
| 894 } | |
| 895 #endif | |
| 896 | |
| 1609 | 897 #ifdef ASSERT |
| 898 //----------------------------is_immutable_value------------------------------- | |
| 899 // Helper function to allow a raw load without control edge for some cases | |
| 900 bool LoadNode::is_immutable_value(Node* adr) { | |
| 901 return (adr->is_AddP() && adr->in(AddPNode::Base)->is_top() && | |
| 902 adr->in(AddPNode::Address)->Opcode() == Op_ThreadLocal && | |
| 903 (adr->in(AddPNode::Offset)->find_intptr_t_con(-1) == | |
| 904 in_bytes(JavaThread::osthread_offset()))); | |
| 905 } | |
| 906 #endif | |
| 0 | 907 |
| 908 //----------------------------LoadNode::make----------------------------------- | |
| 909 // Polymorphic factory method: | |
|
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910 Node *LoadNode::make( PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const TypePtr* adr_type, const Type *rt, BasicType bt ) { |
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911 Compile* C = gvn.C; |
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912 |
| 0 | 913 // sanity check the alias category against the created node type |
| 914 assert(!(adr_type->isa_oopptr() && | |
| 915 adr_type->offset() == oopDesc::klass_offset_in_bytes()), | |
| 916 "use LoadKlassNode instead"); | |
| 917 assert(!(adr_type->isa_aryptr() && | |
| 918 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()), | |
| 919 "use LoadRangeNode instead"); | |
| 1609 | 920 // Check control edge of raw loads |
| 921 assert( ctl != NULL || C->get_alias_index(adr_type) != Compile::AliasIdxRaw || | |
| 922 // oop will be recorded in oop map if load crosses safepoint | |
| 923 rt->isa_oopptr() || is_immutable_value(adr), | |
| 924 "raw memory operations should have control edge"); | |
| 0 | 925 switch (bt) { |
|
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926 case T_BOOLEAN: return new (C) LoadUBNode(ctl, mem, adr, adr_type, rt->is_int() ); |
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927 case T_BYTE: return new (C) LoadBNode (ctl, mem, adr, adr_type, rt->is_int() ); |
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928 case T_INT: return new (C) LoadINode (ctl, mem, adr, adr_type, rt->is_int() ); |
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929 case T_CHAR: return new (C) LoadUSNode(ctl, mem, adr, adr_type, rt->is_int() ); |
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930 case T_SHORT: return new (C) LoadSNode (ctl, mem, adr, adr_type, rt->is_int() ); |
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931 case T_LONG: return new (C) LoadLNode (ctl, mem, adr, adr_type, rt->is_long() ); |
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932 case T_FLOAT: return new (C) LoadFNode (ctl, mem, adr, adr_type, rt ); |
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933 case T_DOUBLE: return new (C) LoadDNode (ctl, mem, adr, adr_type, rt ); |
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934 case T_ADDRESS: return new (C) LoadPNode (ctl, mem, adr, adr_type, rt->is_ptr() ); |
|
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935 case T_OBJECT: |
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936 #ifdef _LP64 |
| 163 | 937 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
|
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938 Node* load = gvn.transform(new (C) LoadNNode(ctl, mem, adr, adr_type, rt->make_narrowoop())); |
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939 return new (C) DecodeNNode(load, load->bottom_type()->make_ptr()); |
|
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940 } else |
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941 #endif |
| 163 | 942 { |
|
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943 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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944 return new (C) LoadPNode(ctl, mem, adr, adr_type, rt->is_oopptr()); |
| 163 | 945 } |
| 0 | 946 } |
| 947 ShouldNotReachHere(); | |
| 948 return (LoadNode*)NULL; | |
| 949 } | |
| 950 | |
| 951 LoadLNode* LoadLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt) { | |
| 952 bool require_atomic = true; | |
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953 return new (C) LoadLNode(ctl, mem, adr, adr_type, rt->is_long(), require_atomic); |
| 0 | 954 } |
| 955 | |
| 956 | |
| 957 | |
| 958 | |
| 959 //------------------------------hash------------------------------------------- | |
| 960 uint LoadNode::hash() const { | |
| 961 // unroll addition of interesting fields | |
| 962 return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address); | |
| 963 } | |
| 964 | |
|
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965 static bool skip_through_membars(Compile::AliasType* atp, const TypeInstPtr* tp, bool eliminate_boxing) { |
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966 if ((atp != NULL) && (atp->index() >= Compile::AliasIdxRaw)) { |
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967 bool non_volatile = (atp->field() != NULL) && !atp->field()->is_volatile(); |
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968 bool is_stable_ary = FoldStableValues && |
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969 (tp != NULL) && (tp->isa_aryptr() != NULL) && |
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970 tp->isa_aryptr()->is_stable(); |
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971 |
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972 return (eliminate_boxing && non_volatile) || is_stable_ary; |
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973 } |
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974 |
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975 return false; |
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976 } |
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977 |
| 0 | 978 //---------------------------can_see_stored_value------------------------------ |
| 979 // This routine exists to make sure this set of tests is done the same | |
| 980 // everywhere. We need to make a coordinated change: first LoadNode::Ideal | |
| 981 // will change the graph shape in a way which makes memory alive twice at the | |
| 982 // same time (uses the Oracle model of aliasing), then some | |
| 983 // LoadXNode::Identity will fold things back to the equivalence-class model | |
| 984 // of aliasing. | |
| 985 Node* MemNode::can_see_stored_value(Node* st, PhaseTransform* phase) const { | |
| 986 Node* ld_adr = in(MemNode::Address); | |
| 10278 | 987 intptr_t ld_off = 0; |
| 988 AllocateNode* ld_alloc = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off); | |
|
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989 const TypeInstPtr* tp = phase->type(ld_adr)->isa_instptr(); |
| 10278 | 990 Compile::AliasType* atp = (tp != NULL) ? phase->C->alias_type(tp) : NULL; |
| 991 // This is more general than load from boxing objects. | |
|
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992 if (skip_through_membars(atp, tp, phase->C->eliminate_boxing())) { |
|
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993 uint alias_idx = atp->index(); |
|
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994 bool final = !atp->is_rewritable(); |
|
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995 Node* result = NULL; |
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996 Node* current = st; |
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997 // Skip through chains of MemBarNodes checking the MergeMems for |
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998 // new states for the slice of this load. Stop once any other |
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999 // kind of node is encountered. Loads from final memory can skip |
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1000 // through any kind of MemBar but normal loads shouldn't skip |
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1001 // through MemBarAcquire since the could allow them to move out of |
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1002 // a synchronized region. |
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1003 while (current->is_Proj()) { |
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1004 int opc = current->in(0)->Opcode(); |
|
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1005 if ((final && (opc == Op_MemBarAcquire || opc == Op_MemBarAcquireLock)) || |
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1006 opc == Op_MemBarRelease || opc == Op_MemBarCPUOrder || |
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1007 opc == Op_MemBarReleaseLock) { |
|
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1008 Node* mem = current->in(0)->in(TypeFunc::Memory); |
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1009 if (mem->is_MergeMem()) { |
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1010 MergeMemNode* merge = mem->as_MergeMem(); |
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1011 Node* new_st = merge->memory_at(alias_idx); |
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1012 if (new_st == merge->base_memory()) { |
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1013 // Keep searching |
| 10278 | 1014 current = new_st; |
|
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1015 continue; |
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1016 } |
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1017 // Save the new memory state for the slice and fall through |
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1018 // to exit. |
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1019 result = new_st; |
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1020 } |
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1021 } |
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1022 break; |
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1023 } |
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1024 if (result != NULL) { |
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1025 st = result; |
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1026 } |
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1027 } |
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1028 |
| 0 | 1029 // Loop around twice in the case Load -> Initialize -> Store. |
| 1030 // (See PhaseIterGVN::add_users_to_worklist, which knows about this case.) | |
| 1031 for (int trip = 0; trip <= 1; trip++) { | |
| 1032 | |
| 1033 if (st->is_Store()) { | |
| 1034 Node* st_adr = st->in(MemNode::Address); | |
| 1035 if (!phase->eqv(st_adr, ld_adr)) { | |
| 1036 // Try harder before giving up... Match raw and non-raw pointers. | |
| 1037 intptr_t st_off = 0; | |
| 1038 AllocateNode* alloc = AllocateNode::Ideal_allocation(st_adr, phase, st_off); | |
| 1039 if (alloc == NULL) return NULL; | |
| 10278 | 1040 if (alloc != ld_alloc) return NULL; |
| 0 | 1041 if (ld_off != st_off) return NULL; |
| 1042 // At this point we have proven something like this setup: | |
| 1043 // A = Allocate(...) | |
| 1044 // L = LoadQ(, AddP(CastPP(, A.Parm),, #Off)) | |
| 1045 // S = StoreQ(, AddP(, A.Parm , #Off), V) | |
| 1046 // (Actually, we haven't yet proven the Q's are the same.) | |
| 1047 // In other words, we are loading from a casted version of | |
| 1048 // the same pointer-and-offset that we stored to. | |
| 1049 // Thus, we are able to replace L by V. | |
| 1050 } | |
| 1051 // Now prove that we have a LoadQ matched to a StoreQ, for some Q. | |
| 1052 if (store_Opcode() != st->Opcode()) | |
| 1053 return NULL; | |
| 1054 return st->in(MemNode::ValueIn); | |
| 1055 } | |
| 1056 | |
| 1057 // A load from a freshly-created object always returns zero. | |
| 1058 // (This can happen after LoadNode::Ideal resets the load's memory input | |
| 1059 // to find_captured_store, which returned InitializeNode::zero_memory.) | |
| 1060 if (st->is_Proj() && st->in(0)->is_Allocate() && | |
| 10278 | 1061 (st->in(0) == ld_alloc) && |
| 1062 (ld_off >= st->in(0)->as_Allocate()->minimum_header_size())) { | |
| 0 | 1063 // return a zero value for the load's basic type |
| 1064 // (This is one of the few places where a generic PhaseTransform | |
| 1065 // can create new nodes. Think of it as lazily manifesting | |
| 1066 // virtually pre-existing constants.) | |
| 1067 return phase->zerocon(memory_type()); | |
| 1068 } | |
| 1069 | |
| 1070 // A load from an initialization barrier can match a captured store. | |
| 1071 if (st->is_Proj() && st->in(0)->is_Initialize()) { | |
| 1072 InitializeNode* init = st->in(0)->as_Initialize(); | |
| 1073 AllocateNode* alloc = init->allocation(); | |
| 10278 | 1074 if ((alloc != NULL) && (alloc == ld_alloc)) { |
| 0 | 1075 // examine a captured store value |
| 10278 | 1076 st = init->find_captured_store(ld_off, memory_size(), phase); |
| 0 | 1077 if (st != NULL) |
| 1078 continue; // take one more trip around | |
| 1079 } | |
| 1080 } | |
| 1081 | |
| 10278 | 1082 // Load boxed value from result of valueOf() call is input parameter. |
| 1083 if (this->is_Load() && ld_adr->is_AddP() && | |
| 1084 (tp != NULL) && tp->is_ptr_to_boxed_value()) { | |
| 1085 intptr_t ignore = 0; | |
| 1086 Node* base = AddPNode::Ideal_base_and_offset(ld_adr, phase, ignore); | |
| 1087 if (base != NULL && base->is_Proj() && | |
| 1088 base->as_Proj()->_con == TypeFunc::Parms && | |
| 1089 base->in(0)->is_CallStaticJava() && | |
| 1090 base->in(0)->as_CallStaticJava()->is_boxing_method()) { | |
| 1091 return base->in(0)->in(TypeFunc::Parms); | |
| 1092 } | |
| 1093 } | |
| 1094 | |
| 0 | 1095 break; |
| 1096 } | |
| 1097 | |
| 1098 return NULL; | |
| 1099 } | |
| 1100 | |
|
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1101 //----------------------is_instance_field_load_with_local_phi------------------ |
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1102 bool LoadNode::is_instance_field_load_with_local_phi(Node* ctrl) { |
| 10278 | 1103 if( in(Memory)->is_Phi() && in(Memory)->in(0) == ctrl && |
| 1104 in(Address)->is_AddP() ) { | |
| 1105 const TypeOopPtr* t_oop = in(Address)->bottom_type()->isa_oopptr(); | |
| 1106 // Only instances and boxed values. | |
| 1107 if( t_oop != NULL && | |
| 1108 (t_oop->is_ptr_to_boxed_value() || | |
| 1109 t_oop->is_known_instance_field()) && | |
|
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1110 t_oop->offset() != Type::OffsetBot && |
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1111 t_oop->offset() != Type::OffsetTop) { |
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1112 return true; |
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1113 } |
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1114 } |
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1115 return false; |
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1116 } |
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1117 |
| 0 | 1118 //------------------------------Identity--------------------------------------- |
| 1119 // Loads are identity if previous store is to same address | |
| 1120 Node *LoadNode::Identity( PhaseTransform *phase ) { | |
| 1121 // If the previous store-maker is the right kind of Store, and the store is | |
| 1122 // to the same address, then we are equal to the value stored. | |
| 10278 | 1123 Node* mem = in(Memory); |
| 0 | 1124 Node* value = can_see_stored_value(mem, phase); |
| 1125 if( value ) { | |
| 1126 // byte, short & char stores truncate naturally. | |
| 1127 // A load has to load the truncated value which requires | |
| 1128 // some sort of masking operation and that requires an | |
| 1129 // Ideal call instead of an Identity call. | |
| 1130 if (memory_size() < BytesPerInt) { | |
| 1131 // If the input to the store does not fit with the load's result type, | |
| 1132 // it must be truncated via an Ideal call. | |
| 1133 if (!phase->type(value)->higher_equal(phase->type(this))) | |
| 1134 return this; | |
| 1135 } | |
| 1136 // (This works even when value is a Con, but LoadNode::Value | |
| 1137 // usually runs first, producing the singleton type of the Con.) | |
| 1138 return value; | |
| 1139 } | |
|
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1140 |
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1141 // Search for an existing data phi which was generated before for the same |
| 605 | 1142 // instance's field to avoid infinite generation of phis in a loop. |
|
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1143 Node *region = mem->in(0); |
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1144 if (is_instance_field_load_with_local_phi(region)) { |
| 10278 | 1145 const TypeOopPtr *addr_t = in(Address)->bottom_type()->isa_oopptr(); |
|
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1146 int this_index = phase->C->get_alias_index(addr_t); |
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1147 int this_offset = addr_t->offset(); |
| 10278 | 1148 int this_iid = addr_t->instance_id(); |
| 1149 if (!addr_t->is_known_instance() && | |
| 1150 addr_t->is_ptr_to_boxed_value()) { | |
| 1151 // Use _idx of address base (could be Phi node) for boxed values. | |
| 1152 intptr_t ignore = 0; | |
| 1153 Node* base = AddPNode::Ideal_base_and_offset(in(Address), phase, ignore); | |
| 1154 this_iid = base->_idx; | |
| 1155 } | |
|
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1156 const Type* this_type = bottom_type(); |
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1157 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
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1158 Node* phi = region->fast_out(i); |
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1159 if (phi->is_Phi() && phi != mem && |
| 10278 | 1160 phi->as_Phi()->is_same_inst_field(this_type, this_iid, this_index, this_offset)) { |
|
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1161 return phi; |
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1162 } |
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1163 } |
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1164 } |
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1165 |
| 0 | 1166 return this; |
| 1167 } | |
| 1168 | |
|
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1169 // We're loading from an object which has autobox behaviour. |
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1170 // If this object is result of a valueOf call we'll have a phi |
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1171 // merging a newly allocated object and a load from the cache. |
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1172 // We want to replace this load with the original incoming |
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1173 // argument to the valueOf call. |
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1174 Node* LoadNode::eliminate_autobox(PhaseGVN* phase) { |
| 10278 | 1175 assert(phase->C->eliminate_boxing(), "sanity"); |
| 1176 intptr_t ignore = 0; | |
| 1177 Node* base = AddPNode::Ideal_base_and_offset(in(Address), phase, ignore); | |
| 1178 if ((base == NULL) || base->is_Phi()) { | |
| 1179 // Push the loads from the phi that comes from valueOf up | |
| 1180 // through it to allow elimination of the loads and the recovery | |
| 1181 // of the original value. It is done in split_through_phi(). | |
| 1182 return NULL; | |
|
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1183 } else if (base->is_Load() || |
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1184 base->is_DecodeN() && base->in(1)->is_Load()) { |
| 10278 | 1185 // Eliminate the load of boxed value for integer types from the cache |
|
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1186 // array by deriving the value from the index into the array. |
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1187 // Capture the offset of the load and then reverse the computation. |
| 10278 | 1188 |
| 1189 // Get LoadN node which loads a boxing object from 'cache' array. | |
| 1190 if (base->is_DecodeN()) { | |
| 1191 base = base->in(1); | |
| 1192 } | |
| 1193 if (!base->in(Address)->is_AddP()) { | |
| 1194 return NULL; // Complex address | |
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1195 } |
| 10278 | 1196 AddPNode* address = base->in(Address)->as_AddP(); |
| 1197 Node* cache_base = address->in(AddPNode::Base); | |
| 1198 if ((cache_base != NULL) && cache_base->is_DecodeN()) { | |
| 1199 // Get ConP node which is static 'cache' field. | |
| 1200 cache_base = cache_base->in(1); | |
| 1201 } | |
| 1202 if ((cache_base != NULL) && cache_base->is_Con()) { | |
| 1203 const TypeAryPtr* base_type = cache_base->bottom_type()->isa_aryptr(); | |
| 1204 if ((base_type != NULL) && base_type->is_autobox_cache()) { | |
|
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1205 Node* elements[4]; |
| 10278 | 1206 int shift = exact_log2(type2aelembytes(T_OBJECT)); |
| 1207 int count = address->unpack_offsets(elements, ARRAY_SIZE(elements)); | |
| 1208 if ((count > 0) && elements[0]->is_Con() && | |
| 1209 ((count == 1) || | |
| 1210 (count == 2) && elements[1]->Opcode() == Op_LShiftX && | |
| 1211 elements[1]->in(2) == phase->intcon(shift))) { | |
| 1212 ciObjArray* array = base_type->const_oop()->as_obj_array(); | |
| 1213 // Fetch the box object cache[0] at the base of the array and get its value | |
| 1214 ciInstance* box = array->obj_at(0)->as_instance(); | |
| 1215 ciInstanceKlass* ik = box->klass()->as_instance_klass(); | |
| 1216 assert(ik->is_box_klass(), "sanity"); | |
| 1217 assert(ik->nof_nonstatic_fields() == 1, "change following code"); | |
| 1218 if (ik->nof_nonstatic_fields() == 1) { | |
| 1219 // This should be true nonstatic_field_at requires calling | |
| 1220 // nof_nonstatic_fields so check it anyway | |
| 1221 ciConstant c = box->field_value(ik->nonstatic_field_at(0)); | |
| 1222 BasicType bt = c.basic_type(); | |
| 1223 // Only integer types have boxing cache. | |
| 1224 assert(bt == T_BOOLEAN || bt == T_CHAR || | |
| 1225 bt == T_BYTE || bt == T_SHORT || | |
| 1226 bt == T_INT || bt == T_LONG, err_msg_res("wrong type = %s", type2name(bt))); | |
| 1227 jlong cache_low = (bt == T_LONG) ? c.as_long() : c.as_int(); | |
| 1228 if (cache_low != (int)cache_low) { | |
| 1229 return NULL; // should not happen since cache is array indexed by value | |
| 1230 } | |
| 1231 jlong offset = arrayOopDesc::base_offset_in_bytes(T_OBJECT) - (cache_low << shift); | |
| 1232 if (offset != (int)offset) { | |
| 1233 return NULL; // should not happen since cache is array indexed by value | |
| 1234 } | |
| 1235 // Add up all the offsets making of the address of the load | |
| 1236 Node* result = elements[0]; | |
| 1237 for (int i = 1; i < count; i++) { | |
| 1238 result = phase->transform(new (phase->C) AddXNode(result, elements[i])); | |
| 1239 } | |
| 1240 // Remove the constant offset from the address and then | |
| 1241 result = phase->transform(new (phase->C) AddXNode(result, phase->MakeConX(-(int)offset))); | |
| 1242 // remove the scaling of the offset to recover the original index. | |
| 1243 if (result->Opcode() == Op_LShiftX && result->in(2) == phase->intcon(shift)) { | |
| 1244 // Peel the shift off directly but wrap it in a dummy node | |
| 1245 // since Ideal can't return existing nodes | |
| 1246 result = new (phase->C) RShiftXNode(result->in(1), phase->intcon(0)); | |
| 1247 } else if (result->is_Add() && result->in(2)->is_Con() && | |
| 1248 result->in(1)->Opcode() == Op_LShiftX && | |
| 1249 result->in(1)->in(2) == phase->intcon(shift)) { | |
| 1250 // We can't do general optimization: ((X<<Z) + Y) >> Z ==> X + (Y>>Z) | |
| 1251 // but for boxing cache access we know that X<<Z will not overflow | |
| 1252 // (there is range check) so we do this optimizatrion by hand here. | |
| 1253 Node* add_con = new (phase->C) RShiftXNode(result->in(2), phase->intcon(shift)); | |
| 1254 result = new (phase->C) AddXNode(result->in(1)->in(1), phase->transform(add_con)); | |
| 1255 } else { | |
| 1256 result = new (phase->C) RShiftXNode(result, phase->intcon(shift)); | |
| 1257 } | |
| 1258 #ifdef _LP64 | |
| 1259 if (bt != T_LONG) { | |
| 1260 result = new (phase->C) ConvL2INode(phase->transform(result)); | |
| 1261 } | |
| 1262 #else | |
| 1263 if (bt == T_LONG) { | |
| 1264 result = new (phase->C) ConvI2LNode(phase->transform(result)); | |
| 1265 } | |
| 1266 #endif | |
| 1267 return result; | |
|
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1268 } |
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1269 } |
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1270 } |
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1271 } |
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1272 } |
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1273 return NULL; |
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1274 } |
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1275 |
| 10278 | 1276 static bool stable_phi(PhiNode* phi, PhaseGVN *phase) { |
| 1277 Node* region = phi->in(0); | |
| 163 | 1278 if (region == NULL) { |
| 10278 | 1279 return false; // Wait stable graph |
| 163 | 1280 } |
| 10278 | 1281 uint cnt = phi->req(); |
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1282 for (uint i = 1; i < cnt; i++) { |
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1283 Node* rc = region->in(i); |
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1284 if (rc == NULL || phase->type(rc) == Type::TOP) |
| 10278 | 1285 return false; // Wait stable graph |
| 1286 Node* in = phi->in(i); | |
| 1287 if (in == NULL || phase->type(in) == Type::TOP) | |
| 1288 return false; // Wait stable graph | |
| 1289 } | |
| 1290 return true; | |
| 1291 } | |
| 1292 //------------------------------split_through_phi------------------------------ | |
| 1293 // Split instance or boxed field load through Phi. | |
| 1294 Node *LoadNode::split_through_phi(PhaseGVN *phase) { | |
| 1295 Node* mem = in(Memory); | |
| 1296 Node* address = in(Address); | |
| 1297 const TypeOopPtr *t_oop = phase->type(address)->isa_oopptr(); | |
| 1298 | |
| 1299 assert((t_oop != NULL) && | |
| 1300 (t_oop->is_known_instance_field() || | |
| 1301 t_oop->is_ptr_to_boxed_value()), "invalide conditions"); | |
| 1302 | |
| 1303 Compile* C = phase->C; | |
| 1304 intptr_t ignore = 0; | |
| 1305 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); | |
| 1306 bool base_is_phi = (base != NULL) && base->is_Phi(); | |
| 1307 bool load_boxed_values = t_oop->is_ptr_to_boxed_value() && C->aggressive_unboxing() && | |
| 1308 (base != NULL) && (base == address->in(AddPNode::Base)) && | |
| 1309 phase->type(base)->higher_equal(TypePtr::NOTNULL); | |
| 1310 | |
| 1311 if (!((mem->is_Phi() || base_is_phi) && | |
| 1312 (load_boxed_values || t_oop->is_known_instance_field()))) { | |
| 1313 return NULL; // memory is not Phi | |
| 1314 } | |
| 1315 | |
| 1316 if (mem->is_Phi()) { | |
| 1317 if (!stable_phi(mem->as_Phi(), phase)) { | |
| 163 | 1318 return NULL; // Wait stable graph |
| 1319 } | |
| 10278 | 1320 uint cnt = mem->req(); |
| 1321 // Check for loop invariant memory. | |
| 1322 if (cnt == 3) { | |
| 1323 for (uint i = 1; i < cnt; i++) { | |
| 1324 Node* in = mem->in(i); | |
| 1325 Node* m = optimize_memory_chain(in, t_oop, this, phase); | |
| 1326 if (m == mem) { | |
| 1327 set_req(Memory, mem->in(cnt - i)); | |
| 1328 return this; // made change | |
| 1329 } | |
| 163 | 1330 } |
| 1331 } | |
| 1332 } | |
| 10278 | 1333 if (base_is_phi) { |
| 1334 if (!stable_phi(base->as_Phi(), phase)) { | |
| 1335 return NULL; // Wait stable graph | |
| 1336 } | |
| 1337 uint cnt = base->req(); | |
| 1338 // Check for loop invariant memory. | |
| 1339 if (cnt == 3) { | |
| 1340 for (uint i = 1; i < cnt; i++) { | |
| 1341 if (base->in(i) == base) { | |
| 1342 return NULL; // Wait stable graph | |
| 1343 } | |
| 1344 } | |
| 1345 } | |
| 1346 } | |
| 1347 | |
| 1348 bool load_boxed_phi = load_boxed_values && base_is_phi && (base->in(0) == mem->in(0)); | |
| 1349 | |
| 163 | 1350 // Split through Phi (see original code in loopopts.cpp). |
| 10278 | 1351 assert(C->have_alias_type(t_oop), "instance should have alias type"); |
| 163 | 1352 |
| 1353 // Do nothing here if Identity will find a value | |
| 1354 // (to avoid infinite chain of value phis generation). | |
|
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1355 if (!phase->eqv(this, this->Identity(phase))) |
| 163 | 1356 return NULL; |
| 1357 | |
| 10278 | 1358 // Select Region to split through. |
| 1359 Node* region; | |
| 1360 if (!base_is_phi) { | |
| 1361 assert(mem->is_Phi(), "sanity"); | |
| 1362 region = mem->in(0); | |
| 1363 // Skip if the region dominates some control edge of the address. | |
| 1364 if (!MemNode::all_controls_dominate(address, region)) | |
| 1365 return NULL; | |
| 1366 } else if (!mem->is_Phi()) { | |
| 1367 assert(base_is_phi, "sanity"); | |
| 1368 region = base->in(0); | |
| 1369 // Skip if the region dominates some control edge of the memory. | |
| 1370 if (!MemNode::all_controls_dominate(mem, region)) | |
| 1371 return NULL; | |
| 1372 } else if (base->in(0) != mem->in(0)) { | |
| 1373 assert(base_is_phi && mem->is_Phi(), "sanity"); | |
| 1374 if (MemNode::all_controls_dominate(mem, base->in(0))) { | |
| 1375 region = base->in(0); | |
| 1376 } else if (MemNode::all_controls_dominate(address, mem->in(0))) { | |
| 1377 region = mem->in(0); | |
| 1378 } else { | |
| 1379 return NULL; // complex graph | |
| 1380 } | |
| 1381 } else { | |
| 1382 assert(base->in(0) == mem->in(0), "sanity"); | |
| 1383 region = mem->in(0); | |
| 1384 } | |
| 163 | 1385 |
| 1386 const Type* this_type = this->bottom_type(); | |
| 10278 | 1387 int this_index = C->get_alias_index(t_oop); |
| 1388 int this_offset = t_oop->offset(); | |
| 1389 int this_iid = t_oop->instance_id(); | |
| 1390 if (!t_oop->is_known_instance() && load_boxed_values) { | |
| 1391 // Use _idx of address base for boxed values. | |
| 1392 this_iid = base->_idx; | |
| 1393 } | |
| 1394 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
| 1395 Node* phi = new (C) PhiNode(region, this_type, NULL, this_iid, this_index, this_offset); | |
|
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1396 for (uint i = 1; i < region->req(); i++) { |
| 10278 | 1397 Node* x; |
| 163 | 1398 Node* the_clone = NULL; |
| 10278 | 1399 if (region->in(i) == C->top()) { |
| 1400 x = C->top(); // Dead path? Use a dead data op | |
| 163 | 1401 } else { |
| 1402 x = this->clone(); // Else clone up the data op | |
| 1403 the_clone = x; // Remember for possible deletion. | |
| 1404 // Alter data node to use pre-phi inputs | |
|
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1405 if (this->in(0) == region) { |
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1406 x->set_req(0, region->in(i)); |
| 163 | 1407 } else { |
|
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1408 x->set_req(0, NULL); |
| 163 | 1409 } |
| 10278 | 1410 if (mem->is_Phi() && (mem->in(0) == region)) { |
| 1411 x->set_req(Memory, mem->in(i)); // Use pre-Phi input for the clone. | |
| 1412 } | |
| 1413 if (address->is_Phi() && address->in(0) == region) { | |
| 1414 x->set_req(Address, address->in(i)); // Use pre-Phi input for the clone | |
| 1415 } | |
| 1416 if (base_is_phi && (base->in(0) == region)) { | |
| 1417 Node* base_x = base->in(i); // Clone address for loads from boxed objects. | |
| 1418 Node* adr_x = phase->transform(new (C) AddPNode(base_x,base_x,address->in(AddPNode::Offset))); | |
| 1419 x->set_req(Address, adr_x); | |
| 163 | 1420 } |
| 1421 } | |
| 1422 // Check for a 'win' on some paths | |
| 1423 const Type *t = x->Value(igvn); | |
| 1424 | |
| 1425 bool singleton = t->singleton(); | |
| 1426 | |
| 1427 // See comments in PhaseIdealLoop::split_thru_phi(). | |
|
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1428 if (singleton && t == Type::TOP) { |
| 163 | 1429 singleton &= region->is_Loop() && (i != LoopNode::EntryControl); |
| 1430 } | |
| 1431 | |
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1432 if (singleton) { |
| 163 | 1433 x = igvn->makecon(t); |
| 1434 } else { | |
| 1435 // We now call Identity to try to simplify the cloned node. | |
| 1436 // Note that some Identity methods call phase->type(this). | |
| 1437 // Make sure that the type array is big enough for | |
| 1438 // our new node, even though we may throw the node away. | |
| 1439 // (This tweaking with igvn only works because x is a new node.) | |
| 1440 igvn->set_type(x, t); | |
|
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1441 // If x is a TypeNode, capture any more-precise type permanently into Node |
| 605 | 1442 // otherwise it will be not updated during igvn->transform since |
|
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1443 // igvn->type(x) is set to x->Value() already. |
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1444 x->raise_bottom_type(t); |
| 163 | 1445 Node *y = x->Identity(igvn); |
|
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1446 if (y != x) { |
| 163 | 1447 x = y; |
| 1448 } else { | |
| 10278 | 1449 y = igvn->hash_find_insert(x); |
|
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1450 if (y) { |
| 163 | 1451 x = y; |
| 1452 } else { | |
| 1453 // Else x is a new node we are keeping | |
| 1454 // We do not need register_new_node_with_optimizer | |
| 1455 // because set_type has already been called. | |
| 1456 igvn->_worklist.push(x); | |
| 1457 } | |
| 1458 } | |
| 1459 } | |
| 10278 | 1460 if (x != the_clone && the_clone != NULL) { |
| 163 | 1461 igvn->remove_dead_node(the_clone); |
| 10278 | 1462 } |
| 163 | 1463 phi->set_req(i, x); |
| 1464 } | |
|
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1465 // Record Phi |
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1466 igvn->register_new_node_with_optimizer(phi); |
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1467 return phi; |
| 163 | 1468 } |
|
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1469 |
| 0 | 1470 //------------------------------Ideal------------------------------------------ |
| 1471 // If the load is from Field memory and the pointer is non-null, we can | |
| 1472 // zero out the control input. | |
| 1473 // If the offset is constant and the base is an object allocation, | |
| 1474 // try to hook me up to the exact initializing store. | |
| 1475 Node *LoadNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1476 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
| 1477 if (p) return (p == NodeSentinel) ? NULL : p; | |
| 1478 | |
| 1479 Node* ctrl = in(MemNode::Control); | |
| 1480 Node* address = in(MemNode::Address); | |
| 1481 | |
| 1482 // Skip up past a SafePoint control. Cannot do this for Stores because | |
| 1483 // pointer stores & cardmarks must stay on the same side of a SafePoint. | |
| 1484 if( ctrl != NULL && ctrl->Opcode() == Op_SafePoint && | |
| 1485 phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw ) { | |
| 1486 ctrl = ctrl->in(0); | |
| 1487 set_req(MemNode::Control,ctrl); | |
| 1488 } | |
| 1489 | |
|
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1490 intptr_t ignore = 0; |
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1491 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); |
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1492 if (base != NULL |
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1493 && phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw) { |
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1494 // Check for useless control edge in some common special cases |
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1495 if (in(MemNode::Control) != NULL |
| 0 | 1496 && phase->type(base)->higher_equal(TypePtr::NOTNULL) |
|
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1497 && all_controls_dominate(base, phase->C->start())) { |
| 0 | 1498 // A method-invariant, non-null address (constant or 'this' argument). |
| 1499 set_req(MemNode::Control, NULL); | |
| 1500 } | |
|
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1501 } |
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1502 |
|
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1503 Node* mem = in(MemNode::Memory); |
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1504 const TypePtr *addr_t = phase->type(address)->isa_ptr(); |
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1505 |
| 10278 | 1506 if (can_reshape && (addr_t != NULL)) { |
|
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1507 // try to optimize our memory input |
| 10278 | 1508 Node* opt_mem = MemNode::optimize_memory_chain(mem, addr_t, this, phase); |
|
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1509 if (opt_mem != mem) { |
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1510 set_req(MemNode::Memory, opt_mem); |
| 305 | 1511 if (phase->type( opt_mem ) == Type::TOP) return NULL; |
|
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1512 return this; |
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1513 } |
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1514 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); |
| 10278 | 1515 if ((t_oop != NULL) && |
| 1516 (t_oop->is_known_instance_field() || | |
| 1517 t_oop->is_ptr_to_boxed_value())) { | |
|
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1518 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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1519 if (igvn != NULL && igvn->_worklist.member(opt_mem)) { |
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1520 // Delay this transformation until memory Phi is processed. |
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1521 phase->is_IterGVN()->_worklist.push(this); |
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1522 return NULL; |
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1523 } |
| 163 | 1524 // Split instance field load through Phi. |
| 1525 Node* result = split_through_phi(phase); | |
| 1526 if (result != NULL) return result; | |
| 10278 | 1527 |
| 1528 if (t_oop->is_ptr_to_boxed_value()) { | |
| 1529 Node* result = eliminate_autobox(phase); | |
| 1530 if (result != NULL) return result; | |
| 1531 } | |
|
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1532 } |
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1533 } |
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1534 |
| 0 | 1535 // Check for prior store with a different base or offset; make Load |
| 1536 // independent. Skip through any number of them. Bail out if the stores | |
| 1537 // are in an endless dead cycle and report no progress. This is a key | |
| 1538 // transform for Reflection. However, if after skipping through the Stores | |
| 1539 // we can't then fold up against a prior store do NOT do the transform as | |
| 1540 // this amounts to using the 'Oracle' model of aliasing. It leaves the same | |
| 1541 // array memory alive twice: once for the hoisted Load and again after the | |
| 1542 // bypassed Store. This situation only works if EVERYBODY who does | |
| 1543 // anti-dependence work knows how to bypass. I.e. we need all | |
| 1544 // anti-dependence checks to ask the same Oracle. Right now, that Oracle is | |
| 1545 // the alias index stuff. So instead, peek through Stores and IFF we can | |
| 1546 // fold up, do so. | |
| 1547 Node* prev_mem = find_previous_store(phase); | |
| 1548 // Steps (a), (b): Walk past independent stores to find an exact match. | |
| 1549 if (prev_mem != NULL && prev_mem != in(MemNode::Memory)) { | |
| 1550 // (c) See if we can fold up on the spot, but don't fold up here. | |
|
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1551 // Fold-up might require truncation (for LoadB/LoadS/LoadUS) or |
| 0 | 1552 // just return a prior value, which is done by Identity calls. |
| 1553 if (can_see_stored_value(prev_mem, phase)) { | |
| 1554 // Make ready for step (d): | |
| 1555 set_req(MemNode::Memory, prev_mem); | |
| 1556 return this; | |
| 1557 } | |
| 1558 } | |
| 1559 | |
| 1560 return NULL; // No further progress | |
| 1561 } | |
| 1562 | |
| 1563 // Helper to recognize certain Klass fields which are invariant across | |
| 1564 // some group of array types (e.g., int[] or all T[] where T < Object). | |
| 1565 const Type* | |
| 1566 LoadNode::load_array_final_field(const TypeKlassPtr *tkls, | |
| 1567 ciKlass* klass) const { | |
|
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1568 if (tkls->offset() == in_bytes(Klass::modifier_flags_offset())) { |
| 0 | 1569 // The field is Klass::_modifier_flags. Return its (constant) value. |
| 1570 // (Folds up the 2nd indirection in aClassConstant.getModifiers().) | |
| 1571 assert(this->Opcode() == Op_LoadI, "must load an int from _modifier_flags"); | |
| 1572 return TypeInt::make(klass->modifier_flags()); | |
| 1573 } | |
|
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1574 if (tkls->offset() == in_bytes(Klass::access_flags_offset())) { |
| 0 | 1575 // The field is Klass::_access_flags. Return its (constant) value. |
| 1576 // (Folds up the 2nd indirection in Reflection.getClassAccessFlags(aClassConstant).) | |
| 1577 assert(this->Opcode() == Op_LoadI, "must load an int from _access_flags"); | |
| 1578 return TypeInt::make(klass->access_flags()); | |
| 1579 } | |
|
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1580 if (tkls->offset() == in_bytes(Klass::layout_helper_offset())) { |
| 0 | 1581 // The field is Klass::_layout_helper. Return its constant value if known. |
| 1582 assert(this->Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
| 1583 return TypeInt::make(klass->layout_helper()); | |
| 1584 } | |
| 1585 | |
| 1586 // No match. | |
| 1587 return NULL; | |
| 1588 } | |
| 1589 | |
|
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1590 // Try to constant-fold a stable array element. |
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1591 static const Type* fold_stable_ary_elem(const TypeAryPtr* ary, int off, BasicType loadbt) { |
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1592 assert(ary->is_stable(), "array should be stable"); |
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1593 |
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1594 if (ary->const_oop() != NULL) { |
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1595 // Decode the results of GraphKit::array_element_address. |
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1596 ciArray* aobj = ary->const_oop()->as_array(); |
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1597 ciConstant con = aobj->element_value_by_offset(off); |
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1598 |
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1599 if (con.basic_type() != T_ILLEGAL && !con.is_null_or_zero()) { |
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1600 const Type* con_type = Type::make_from_constant(con); |
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1601 if (con_type != NULL) { |
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1602 if (con_type->isa_aryptr()) { |
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1603 // Join with the array element type, in case it is also stable. |
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1604 int dim = ary->stable_dimension(); |
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1605 con_type = con_type->is_aryptr()->cast_to_stable(true, dim-1); |
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1606 } |
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1607 if (loadbt == T_NARROWOOP && con_type->isa_oopptr()) { |
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1608 con_type = con_type->make_narrowoop(); |
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|
1609 } |
|
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1610 #ifndef PRODUCT |
|
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1611 if (TraceIterativeGVN) { |
|
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|
1612 tty->print("FoldStableValues: array element [off=%d]: con_type=", off); |
|
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|
1613 con_type->dump(); tty->cr(); |
|
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|
1614 } |
|
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|
1615 #endif //PRODUCT |
|
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1616 return con_type; |
|
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|
1617 } |
|
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|
1618 } |
|
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|
1619 } |
|
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|
1620 |
|
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|
1621 return NULL; |
|
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|
1622 } |
|
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|
1623 |
| 0 | 1624 //------------------------------Value----------------------------------------- |
| 1625 const Type *LoadNode::Value( PhaseTransform *phase ) const { | |
| 1626 // Either input is TOP ==> the result is TOP | |
| 1627 Node* mem = in(MemNode::Memory); | |
| 1628 const Type *t1 = phase->type(mem); | |
| 1629 if (t1 == Type::TOP) return Type::TOP; | |
| 1630 Node* adr = in(MemNode::Address); | |
| 1631 const TypePtr* tp = phase->type(adr)->isa_ptr(); | |
| 1632 if (tp == NULL || tp->empty()) return Type::TOP; | |
| 1633 int off = tp->offset(); | |
| 1634 assert(off != Type::OffsetTop, "case covered by TypePtr::empty"); | |
|
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1635 Compile* C = phase->C; |
| 0 | 1636 |
| 1637 // Try to guess loaded type from pointer type | |
|
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1638 if (tp->isa_aryptr()) { |
|
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1639 const TypeAryPtr* ary = tp->is_aryptr(); |
|
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1640 const Type *t = ary->elem(); |
|
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1641 |
|
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|
1642 // Determine whether the reference is beyond the header or not, by comparing |
|
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1643 // the offset against the offset of the start of the array's data. |
|
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1644 // Different array types begin at slightly different offsets (12 vs. 16). |
|
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1645 // We choose T_BYTE as an example base type that is least restrictive |
|
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1646 // as to alignment, which will therefore produce the smallest |
|
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1647 // possible base offset. |
|
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|
1648 const int min_base_off = arrayOopDesc::base_offset_in_bytes(T_BYTE); |
|
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1649 const bool off_beyond_header = ((uint)off >= (uint)min_base_off); |
|
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1650 |
|
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|
1651 // Try to constant-fold a stable array element. |
|
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|
1652 if (FoldStableValues && ary->is_stable()) { |
|
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1653 // Make sure the reference is not into the header |
|
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1654 if (off_beyond_header && off != Type::OffsetBot) { |
|
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1655 assert(adr->is_AddP() && adr->in(AddPNode::Offset)->is_Con(), "offset is a constant"); |
|
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1656 const Type* con_type = fold_stable_ary_elem(ary, off, memory_type()); |
|
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|
1657 if (con_type != NULL) { |
|
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|
1658 return con_type; |
|
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|
1659 } |
|
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|
1660 } |
|
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|
1661 } |
|
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|
1662 |
| 0 | 1663 // Don't do this for integer types. There is only potential profit if |
| 1664 // the element type t is lower than _type; that is, for int types, if _type is | |
| 1665 // more restrictive than t. This only happens here if one is short and the other | |
| 1666 // char (both 16 bits), and in those cases we've made an intentional decision | |
| 1667 // to use one kind of load over the other. See AndINode::Ideal and 4965907. | |
| 1668 // Also, do not try to narrow the type for a LoadKlass, regardless of offset. | |
| 1669 // | |
| 1670 // Yes, it is possible to encounter an expression like (LoadKlass p1:(AddP x x 8)) | |
| 1671 // where the _gvn.type of the AddP is wider than 8. This occurs when an earlier | |
| 1672 // copy p0 of (AddP x x 8) has been proven equal to p1, and the p0 has been | |
| 1673 // subsumed by p1. If p1 is on the worklist but has not yet been re-transformed, | |
| 1674 // it is possible that p1 will have a type like Foo*[int+]:NotNull*+any. | |
| 1675 // In fact, that could have been the original type of p1, and p1 could have | |
| 1676 // had an original form like p1:(AddP x x (LShiftL quux 3)), where the | |
| 1677 // expression (LShiftL quux 3) independently optimized to the constant 8. | |
| 1678 if ((t->isa_int() == NULL) && (t->isa_long() == NULL) | |
|
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|
1679 && (_type->isa_vect() == NULL) |
|
293
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|
1680 && Opcode() != Op_LoadKlass && Opcode() != Op_LoadNKlass) { |
| 0 | 1681 // t might actually be lower than _type, if _type is a unique |
| 1682 // concrete subclass of abstract class t. | |
|
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|
1683 if (off_beyond_header) { // is the offset beyond the header? |
| 0 | 1684 const Type* jt = t->join(_type); |
| 1685 // In any case, do not allow the join, per se, to empty out the type. | |
| 1686 if (jt->empty() && !t->empty()) { | |
| 1687 // This can happen if a interface-typed array narrows to a class type. | |
| 1688 jt = _type; | |
| 1689 } | |
| 10278 | 1690 #ifdef ASSERT |
| 1691 if (phase->C->eliminate_boxing() && adr->is_AddP()) { | |
|
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|
1692 // The pointers in the autobox arrays are always non-null |
|
708
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|
1693 Node* base = adr->in(AddPNode::Base); |
| 10278 | 1694 if ((base != NULL) && base->is_DecodeN()) { |
| 1695 // Get LoadN node which loads IntegerCache.cache field | |
| 1696 base = base->in(1); | |
| 1697 } | |
| 1698 if ((base != NULL) && base->is_Con()) { | |
| 1699 const TypeAryPtr* base_type = base->bottom_type()->isa_aryptr(); | |
| 1700 if ((base_type != NULL) && base_type->is_autobox_cache()) { | |
| 1701 // It could be narrow oop | |
| 1702 assert(jt->make_ptr()->ptr() == TypePtr::NotNull,"sanity"); | |
|
17
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|
1703 } |
|
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|
1704 } |
|
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|
1705 } |
| 10278 | 1706 #endif |
| 0 | 1707 return jt; |
| 1708 } | |
| 1709 } | |
| 1710 } else if (tp->base() == Type::InstPtr) { | |
|
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|
1711 ciEnv* env = C->env(); |
|
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|
1712 const TypeInstPtr* tinst = tp->is_instptr(); |
|
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|
1713 ciKlass* klass = tinst->klass(); |
| 0 | 1714 assert( off != Type::OffsetBot || |
| 1715 // arrays can be cast to Objects | |
| 1716 tp->is_oopptr()->klass()->is_java_lang_Object() || | |
| 1717 // unsafe field access may not have a constant offset | |
|
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|
1718 C->has_unsafe_access(), |
| 0 | 1719 "Field accesses must be precise" ); |
| 1720 // For oop loads, we expect the _type to be precise | |
|
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|
1721 if (klass == env->String_klass() && |
|
1080
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|
1722 adr->is_AddP() && off != Type::OffsetBot) { |
|
2320
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|
1723 // For constant Strings treat the final fields as compile time constants. |
|
1080
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|
1724 Node* base = adr->in(AddPNode::Base); |
|
1766
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|
1725 const TypeOopPtr* t = phase->type(base)->isa_oopptr(); |
|
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|
1726 if (t != NULL && t->singleton()) { |
|
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|
1727 ciField* field = env->String_klass()->get_field_by_offset(off, false); |
|
2320
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|
1728 if (field != NULL && field->is_final()) { |
|
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|
1729 ciObject* string = t->const_oop(); |
|
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|
1730 ciConstant constant = string->as_instance()->field_value(field); |
|
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|
1731 if (constant.basic_type() == T_INT) { |
|
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|
1732 return TypeInt::make(constant.as_int()); |
|
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|
1733 } else if (constant.basic_type() == T_ARRAY) { |
|
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|
1734 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
|
2379
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|
1735 return TypeNarrowOop::make_from_constant(constant.as_object(), true); |
|
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|
1736 } else { |
|
2379
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|
1737 return TypeOopPtr::make_from_constant(constant.as_object(), true); |
|
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|
1738 } |
|
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|
1739 } |
|
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|
1740 } |
|
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|
1741 } |
|
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|
1742 } |
|
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|
1743 // Optimizations for constant objects |
|
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|
1744 ciObject* const_oop = tinst->const_oop(); |
|
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|
1745 if (const_oop != NULL) { |
| 10278 | 1746 // For constant Boxed value treat the target field as a compile time constant. |
| 1747 if (tinst->is_ptr_to_boxed_value()) { | |
| 1748 return tinst->get_const_boxed_value(); | |
| 1749 } else | |
|
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|
1750 // For constant CallSites treat the target field as a compile time constant. |
|
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|
1751 if (const_oop->is_call_site()) { |
|
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|
1752 ciCallSite* call_site = const_oop->as_call_site(); |
|
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|
1753 ciField* field = call_site->klass()->as_instance_klass()->get_field_by_offset(off, /*is_static=*/ false); |
|
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|
1754 if (field != NULL && field->is_call_site_target()) { |
|
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|
1755 ciMethodHandle* target = call_site->get_target(); |
|
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|
1756 if (target != NULL) { // just in case |
|
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|
1757 ciConstant constant(T_OBJECT, target); |
|
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|
1758 const Type* t; |
|
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|
1759 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
|
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|
1760 t = TypeNarrowOop::make_from_constant(constant.as_object(), true); |
|
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|
1761 } else { |
|
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|
1762 t = TypeOopPtr::make_from_constant(constant.as_object(), true); |
|
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|
1763 } |
|
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|
1764 // Add a dependence for invalidation of the optimization. |
|
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|
1765 if (!call_site->is_constant_call_site()) { |
|
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|
1766 C->dependencies()->assert_call_site_target_value(call_site, target); |
|
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|
1767 } |
|
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|
1768 return t; |
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1769 } |
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1770 } |
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1771 } |
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1772 } |
| 0 | 1773 } else if (tp->base() == Type::KlassPtr) { |
| 1774 assert( off != Type::OffsetBot || | |
| 1775 // arrays can be cast to Objects | |
| 1776 tp->is_klassptr()->klass()->is_java_lang_Object() || | |
| 1777 // also allow array-loading from the primary supertype | |
| 1778 // array during subtype checks | |
| 1779 Opcode() == Op_LoadKlass, | |
| 1780 "Field accesses must be precise" ); | |
| 1781 // For klass/static loads, we expect the _type to be precise | |
| 1782 } | |
| 1783 | |
| 1784 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
| 1785 if (tkls != NULL && !StressReflectiveCode) { | |
| 1786 ciKlass* klass = tkls->klass(); | |
| 1787 if (klass->is_loaded() && tkls->klass_is_exact()) { | |
| 1788 // We are loading a field from a Klass metaobject whose identity | |
| 1789 // is known at compile time (the type is "exact" or "precise"). | |
| 1790 // Check for fields we know are maintained as constants by the VM. | |
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1791 if (tkls->offset() == in_bytes(Klass::super_check_offset_offset())) { |
| 0 | 1792 // The field is Klass::_super_check_offset. Return its (constant) value. |
| 1793 // (Folds up type checking code.) | |
| 1794 assert(Opcode() == Op_LoadI, "must load an int from _super_check_offset"); | |
| 1795 return TypeInt::make(klass->super_check_offset()); | |
| 1796 } | |
| 1797 // Compute index into primary_supers array | |
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1798 juint depth = (tkls->offset() - in_bytes(Klass::primary_supers_offset())) / sizeof(Klass*); |
| 0 | 1799 // Check for overflowing; use unsigned compare to handle the negative case. |
| 1800 if( depth < ciKlass::primary_super_limit() ) { | |
| 1801 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
| 1802 // (Folds up type checking code.) | |
| 1803 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
| 1804 ciKlass *ss = klass->super_of_depth(depth); | |
| 1805 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
| 1806 } | |
| 1807 const Type* aift = load_array_final_field(tkls, klass); | |
| 1808 if (aift != NULL) return aift; | |
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1809 if (tkls->offset() == in_bytes(ArrayKlass::component_mirror_offset()) |
| 0 | 1810 && klass->is_array_klass()) { |
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1811 // The field is ArrayKlass::_component_mirror. Return its (constant) value. |
| 0 | 1812 // (Folds up aClassConstant.getComponentType, common in Arrays.copyOf.) |
| 1813 assert(Opcode() == Op_LoadP, "must load an oop from _component_mirror"); | |
| 1814 return TypeInstPtr::make(klass->as_array_klass()->component_mirror()); | |
| 1815 } | |
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1816 if (tkls->offset() == in_bytes(Klass::java_mirror_offset())) { |
| 0 | 1817 // The field is Klass::_java_mirror. Return its (constant) value. |
| 1818 // (Folds up the 2nd indirection in anObjConstant.getClass().) | |
| 1819 assert(Opcode() == Op_LoadP, "must load an oop from _java_mirror"); | |
| 1820 return TypeInstPtr::make(klass->java_mirror()); | |
| 1821 } | |
| 1822 } | |
| 1823 | |
| 1824 // We can still check if we are loading from the primary_supers array at a | |
| 1825 // shallow enough depth. Even though the klass is not exact, entries less | |
| 1826 // than or equal to its super depth are correct. | |
| 1827 if (klass->is_loaded() ) { | |
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1828 ciType *inner = klass; |
| 0 | 1829 while( inner->is_obj_array_klass() ) |
| 1830 inner = inner->as_obj_array_klass()->base_element_type(); | |
| 1831 if( inner->is_instance_klass() && | |
| 1832 !inner->as_instance_klass()->flags().is_interface() ) { | |
| 1833 // Compute index into primary_supers array | |
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1834 juint depth = (tkls->offset() - in_bytes(Klass::primary_supers_offset())) / sizeof(Klass*); |
| 0 | 1835 // Check for overflowing; use unsigned compare to handle the negative case. |
| 1836 if( depth < ciKlass::primary_super_limit() && | |
| 1837 depth <= klass->super_depth() ) { // allow self-depth checks to handle self-check case | |
| 1838 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
| 1839 // (Folds up type checking code.) | |
| 1840 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
| 1841 ciKlass *ss = klass->super_of_depth(depth); | |
| 1842 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
| 1843 } | |
| 1844 } | |
| 1845 } | |
| 1846 | |
| 1847 // If the type is enough to determine that the thing is not an array, | |
| 1848 // we can give the layout_helper a positive interval type. | |
| 1849 // This will help short-circuit some reflective code. | |
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1850 if (tkls->offset() == in_bytes(Klass::layout_helper_offset()) |
| 0 | 1851 && !klass->is_array_klass() // not directly typed as an array |
| 1852 && !klass->is_interface() // specifically not Serializable & Cloneable | |
| 1853 && !klass->is_java_lang_Object() // not the supertype of all T[] | |
| 1854 ) { | |
| 1855 // Note: When interfaces are reliable, we can narrow the interface | |
| 1856 // test to (klass != Serializable && klass != Cloneable). | |
| 1857 assert(Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
| 1858 jint min_size = Klass::instance_layout_helper(oopDesc::header_size(), false); | |
| 1859 // The key property of this type is that it folds up tests | |
| 1860 // for array-ness, since it proves that the layout_helper is positive. | |
| 1861 // Thus, a generic value like the basic object layout helper works fine. | |
| 1862 return TypeInt::make(min_size, max_jint, Type::WidenMin); | |
| 1863 } | |
| 1864 } | |
| 1865 | |
| 1866 // If we are loading from a freshly-allocated object, produce a zero, | |
| 1867 // if the load is provably beyond the header of the object. | |
| 1868 // (Also allow a variable load from a fresh array to produce zero.) | |
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1869 const TypeOopPtr *tinst = tp->isa_oopptr(); |
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1870 bool is_instance = (tinst != NULL) && tinst->is_known_instance_field(); |
| 10278 | 1871 bool is_boxed_value = (tinst != NULL) && tinst->is_ptr_to_boxed_value(); |
| 1872 if (ReduceFieldZeroing || is_instance || is_boxed_value) { | |
| 0 | 1873 Node* value = can_see_stored_value(mem,phase); |
| 4815 | 1874 if (value != NULL && value->is_Con()) { |
| 1875 assert(value->bottom_type()->higher_equal(_type),"sanity"); | |
| 0 | 1876 return value->bottom_type(); |
| 4815 | 1877 } |
| 0 | 1878 } |
| 1879 | |
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1880 if (is_instance) { |
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1881 // If we have an instance type and our memory input is the |
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1882 // programs's initial memory state, there is no matching store, |
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1883 // so just return a zero of the appropriate type |
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1884 Node *mem = in(MemNode::Memory); |
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1885 if (mem->is_Parm() && mem->in(0)->is_Start()) { |
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1886 assert(mem->as_Parm()->_con == TypeFunc::Memory, "must be memory Parm"); |
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1887 return Type::get_zero_type(_type->basic_type()); |
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1888 } |
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1889 } |
| 0 | 1890 return _type; |
| 1891 } | |
| 1892 | |
| 1893 //------------------------------match_edge------------------------------------- | |
| 1894 // Do we Match on this edge index or not? Match only the address. | |
| 1895 uint LoadNode::match_edge(uint idx) const { | |
| 1896 return idx == MemNode::Address; | |
| 1897 } | |
| 1898 | |
| 1899 //--------------------------LoadBNode::Ideal-------------------------------------- | |
| 1900 // | |
| 1901 // If the previous store is to the same address as this load, | |
| 1902 // and the value stored was larger than a byte, replace this load | |
| 1903 // with the value stored truncated to a byte. If no truncation is | |
| 1904 // needed, the replacement is done in LoadNode::Identity(). | |
| 1905 // | |
| 1906 Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1907 Node* mem = in(MemNode::Memory); | |
| 1908 Node* value = can_see_stored_value(mem,phase); | |
| 1909 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
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1910 Node *result = phase->transform( new (phase->C) LShiftINode(value, phase->intcon(24)) ); |
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1911 return new (phase->C) RShiftINode(result, phase->intcon(24)); |
| 0 | 1912 } |
| 1913 // Identity call will handle the case where truncation is not needed. | |
| 1914 return LoadNode::Ideal(phase, can_reshape); | |
| 1915 } | |
| 1916 | |
| 4815 | 1917 const Type* LoadBNode::Value(PhaseTransform *phase) const { |
| 1918 Node* mem = in(MemNode::Memory); | |
| 1919 Node* value = can_see_stored_value(mem,phase); | |
| 4821 | 1920 if (value != NULL && value->is_Con() && |
| 1921 !value->bottom_type()->higher_equal(_type)) { | |
| 4815 | 1922 // If the input to the store does not fit with the load's result type, |
| 1923 // it must be truncated. We can't delay until Ideal call since | |
| 1924 // a singleton Value is needed for split_thru_phi optimization. | |
| 1925 int con = value->get_int(); | |
| 1926 return TypeInt::make((con << 24) >> 24); | |
| 1927 } | |
| 1928 return LoadNode::Value(phase); | |
| 1929 } | |
| 1930 | |
| 624 | 1931 //--------------------------LoadUBNode::Ideal------------------------------------- |
| 1932 // | |
| 1933 // If the previous store is to the same address as this load, | |
| 1934 // and the value stored was larger than a byte, replace this load | |
| 1935 // with the value stored truncated to a byte. If no truncation is | |
| 1936 // needed, the replacement is done in LoadNode::Identity(). | |
| 1937 // | |
| 1938 Node* LoadUBNode::Ideal(PhaseGVN* phase, bool can_reshape) { | |
| 1939 Node* mem = in(MemNode::Memory); | |
| 1940 Node* value = can_see_stored_value(mem, phase); | |
| 1941 if (value && !phase->type(value)->higher_equal(_type)) | |
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1942 return new (phase->C) AndINode(value, phase->intcon(0xFF)); |
| 624 | 1943 // Identity call will handle the case where truncation is not needed. |
| 1944 return LoadNode::Ideal(phase, can_reshape); | |
| 1945 } | |
| 1946 | |
| 4815 | 1947 const Type* LoadUBNode::Value(PhaseTransform *phase) const { |
| 1948 Node* mem = in(MemNode::Memory); | |
| 1949 Node* value = can_see_stored_value(mem,phase); | |
| 4821 | 1950 if (value != NULL && value->is_Con() && |
| 1951 !value->bottom_type()->higher_equal(_type)) { | |
| 4815 | 1952 // If the input to the store does not fit with the load's result type, |
| 1953 // it must be truncated. We can't delay until Ideal call since | |
| 1954 // a singleton Value is needed for split_thru_phi optimization. | |
| 1955 int con = value->get_int(); | |
| 1956 return TypeInt::make(con & 0xFF); | |
| 1957 } | |
| 1958 return LoadNode::Value(phase); | |
| 1959 } | |
| 1960 | |
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1961 //--------------------------LoadUSNode::Ideal------------------------------------- |
| 0 | 1962 // |
| 1963 // If the previous store is to the same address as this load, | |
| 1964 // and the value stored was larger than a char, replace this load | |
| 1965 // with the value stored truncated to a char. If no truncation is | |
| 1966 // needed, the replacement is done in LoadNode::Identity(). | |
| 1967 // | |
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1968 Node *LoadUSNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
| 0 | 1969 Node* mem = in(MemNode::Memory); |
| 1970 Node* value = can_see_stored_value(mem,phase); | |
| 1971 if( value && !phase->type(value)->higher_equal( _type ) ) | |
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1972 return new (phase->C) AndINode(value,phase->intcon(0xFFFF)); |
| 0 | 1973 // Identity call will handle the case where truncation is not needed. |
| 1974 return LoadNode::Ideal(phase, can_reshape); | |
| 1975 } | |
| 1976 | |
| 4815 | 1977 const Type* LoadUSNode::Value(PhaseTransform *phase) const { |
| 1978 Node* mem = in(MemNode::Memory); | |
| 1979 Node* value = can_see_stored_value(mem,phase); | |
| 4821 | 1980 if (value != NULL && value->is_Con() && |
| 1981 !value->bottom_type()->higher_equal(_type)) { | |
| 4815 | 1982 // If the input to the store does not fit with the load's result type, |
| 1983 // it must be truncated. We can't delay until Ideal call since | |
| 1984 // a singleton Value is needed for split_thru_phi optimization. | |
| 1985 int con = value->get_int(); | |
| 1986 return TypeInt::make(con & 0xFFFF); | |
| 1987 } | |
| 1988 return LoadNode::Value(phase); | |
| 1989 } | |
| 1990 | |
| 0 | 1991 //--------------------------LoadSNode::Ideal-------------------------------------- |
| 1992 // | |
| 1993 // If the previous store is to the same address as this load, | |
| 1994 // and the value stored was larger than a short, replace this load | |
| 1995 // with the value stored truncated to a short. If no truncation is | |
| 1996 // needed, the replacement is done in LoadNode::Identity(). | |
| 1997 // | |
| 1998 Node *LoadSNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1999 Node* mem = in(MemNode::Memory); | |
| 2000 Node* value = can_see_stored_value(mem,phase); | |
| 2001 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
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2002 Node *result = phase->transform( new (phase->C) LShiftINode(value, phase->intcon(16)) ); |
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2003 return new (phase->C) RShiftINode(result, phase->intcon(16)); |
| 0 | 2004 } |
| 2005 // Identity call will handle the case where truncation is not needed. | |
| 2006 return LoadNode::Ideal(phase, can_reshape); | |
| 2007 } | |
| 2008 | |
| 4815 | 2009 const Type* LoadSNode::Value(PhaseTransform *phase) const { |
| 2010 Node* mem = in(MemNode::Memory); | |
| 2011 Node* value = can_see_stored_value(mem,phase); | |
| 4821 | 2012 if (value != NULL && value->is_Con() && |
| 2013 !value->bottom_type()->higher_equal(_type)) { | |
| 4815 | 2014 // If the input to the store does not fit with the load's result type, |
| 2015 // it must be truncated. We can't delay until Ideal call since | |
| 2016 // a singleton Value is needed for split_thru_phi optimization. | |
| 2017 int con = value->get_int(); | |
| 2018 return TypeInt::make((con << 16) >> 16); | |
| 2019 } | |
| 2020 return LoadNode::Value(phase); | |
| 2021 } | |
| 2022 | |
| 0 | 2023 //============================================================================= |
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2024 //----------------------------LoadKlassNode::make------------------------------ |
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2025 // Polymorphic factory method: |
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2026 Node *LoadKlassNode::make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, const TypeKlassPtr *tk ) { |
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2027 Compile* C = gvn.C; |
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2028 Node *ctl = NULL; |
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2029 // sanity check the alias category against the created node type |
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2030 const TypePtr *adr_type = adr->bottom_type()->isa_ptr(); |
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2031 assert(adr_type != NULL, "expecting TypeKlassPtr"); |
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2032 #ifdef _LP64 |
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2033 if (adr_type->is_ptr_to_narrowklass()) { |
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2034 assert(UseCompressedClassPointers, "no compressed klasses"); |
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2035 Node* load_klass = gvn.transform(new (C) LoadNKlassNode(ctl, mem, adr, at, tk->make_narrowklass())); |
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2036 return new (C) DecodeNKlassNode(load_klass, load_klass->bottom_type()->make_ptr()); |
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2037 } |
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2038 #endif |
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2039 assert(!adr_type->is_ptr_to_narrowklass() && !adr_type->is_ptr_to_narrowoop(), "should have got back a narrow oop"); |
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2040 return new (C) LoadKlassNode(ctl, mem, adr, at, tk); |
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2041 } |
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2042 |
| 0 | 2043 //------------------------------Value------------------------------------------ |
| 2044 const Type *LoadKlassNode::Value( PhaseTransform *phase ) const { | |
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2045 return klass_value_common(phase); |
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2046 } |
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2047 |
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2048 const Type *LoadNode::klass_value_common( PhaseTransform *phase ) const { |
| 0 | 2049 // Either input is TOP ==> the result is TOP |
| 2050 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
| 2051 if (t1 == Type::TOP) return Type::TOP; | |
| 2052 Node *adr = in(MemNode::Address); | |
| 2053 const Type *t2 = phase->type( adr ); | |
| 2054 if (t2 == Type::TOP) return Type::TOP; | |
| 2055 const TypePtr *tp = t2->is_ptr(); | |
| 2056 if (TypePtr::above_centerline(tp->ptr()) || | |
| 2057 tp->ptr() == TypePtr::Null) return Type::TOP; | |
| 2058 | |
| 2059 // Return a more precise klass, if possible | |
| 2060 const TypeInstPtr *tinst = tp->isa_instptr(); | |
| 2061 if (tinst != NULL) { | |
| 2062 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
| 2063 int offset = tinst->offset(); | |
| 2064 if (ik == phase->C->env()->Class_klass() | |
| 2065 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
| 2066 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
| 2067 // We are loading a special hidden field from a Class mirror object, | |
| 2068 // the field which points to the VM's Klass metaobject. | |
| 2069 ciType* t = tinst->java_mirror_type(); | |
| 2070 // java_mirror_type returns non-null for compile-time Class constants. | |
| 2071 if (t != NULL) { | |
| 2072 // constant oop => constant klass | |
| 2073 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
| 2074 return TypeKlassPtr::make(ciArrayKlass::make(t)); | |
| 2075 } | |
| 2076 if (!t->is_klass()) { | |
| 2077 // a primitive Class (e.g., int.class) has NULL for a klass field | |
| 2078 return TypePtr::NULL_PTR; | |
| 2079 } | |
| 2080 // (Folds up the 1st indirection in aClassConstant.getModifiers().) | |
| 2081 return TypeKlassPtr::make(t->as_klass()); | |
| 2082 } | |
| 2083 // non-constant mirror, so we can't tell what's going on | |
| 2084 } | |
| 2085 if( !ik->is_loaded() ) | |
| 2086 return _type; // Bail out if not loaded | |
| 2087 if (offset == oopDesc::klass_offset_in_bytes()) { | |
| 2088 if (tinst->klass_is_exact()) { | |
| 2089 return TypeKlassPtr::make(ik); | |
| 2090 } | |
| 2091 // See if we can become precise: no subklasses and no interface | |
| 2092 // (Note: We need to support verified interfaces.) | |
| 2093 if (!ik->is_interface() && !ik->has_subklass()) { | |
| 2094 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
| 2095 // Add a dependence; if any subclass added we need to recompile | |
| 2096 if (!ik->is_final()) { | |
| 2097 // %%% should use stronger assert_unique_concrete_subtype instead | |
| 2098 phase->C->dependencies()->assert_leaf_type(ik); | |
| 2099 } | |
| 2100 // Return precise klass | |
| 2101 return TypeKlassPtr::make(ik); | |
| 2102 } | |
| 2103 | |
| 2104 // Return root of possible klass | |
| 2105 return TypeKlassPtr::make(TypePtr::NotNull, ik, 0/*offset*/); | |
| 2106 } | |
| 2107 } | |
| 2108 | |
| 2109 // Check for loading klass from an array | |
| 2110 const TypeAryPtr *tary = tp->isa_aryptr(); | |
| 2111 if( tary != NULL ) { | |
| 2112 ciKlass *tary_klass = tary->klass(); | |
| 2113 if (tary_klass != NULL // can be NULL when at BOTTOM or TOP | |
| 2114 && tary->offset() == oopDesc::klass_offset_in_bytes()) { | |
| 2115 if (tary->klass_is_exact()) { | |
| 2116 return TypeKlassPtr::make(tary_klass); | |
| 2117 } | |
| 2118 ciArrayKlass *ak = tary->klass()->as_array_klass(); | |
| 2119 // If the klass is an object array, we defer the question to the | |
| 2120 // array component klass. | |
| 2121 if( ak->is_obj_array_klass() ) { | |
| 2122 assert( ak->is_loaded(), "" ); | |
| 2123 ciKlass *base_k = ak->as_obj_array_klass()->base_element_klass(); | |
| 2124 if( base_k->is_loaded() && base_k->is_instance_klass() ) { | |
| 2125 ciInstanceKlass* ik = base_k->as_instance_klass(); | |
| 2126 // See if we can become precise: no subklasses and no interface | |
| 2127 if (!ik->is_interface() && !ik->has_subklass()) { | |
| 2128 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
| 2129 // Add a dependence; if any subclass added we need to recompile | |
| 2130 if (!ik->is_final()) { | |
| 2131 phase->C->dependencies()->assert_leaf_type(ik); | |
| 2132 } | |
| 2133 // Return precise array klass | |
| 2134 return TypeKlassPtr::make(ak); | |
| 2135 } | |
| 2136 } | |
| 2137 return TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
| 2138 } else { // Found a type-array? | |
| 2139 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
| 2140 assert( ak->is_type_array_klass(), "" ); | |
| 2141 return TypeKlassPtr::make(ak); // These are always precise | |
| 2142 } | |
| 2143 } | |
| 2144 } | |
| 2145 | |
| 2146 // Check for loading klass from an array klass | |
| 2147 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
| 2148 if (tkls != NULL && !StressReflectiveCode) { | |
| 2149 ciKlass* klass = tkls->klass(); | |
| 2150 if( !klass->is_loaded() ) | |
| 2151 return _type; // Bail out if not loaded | |
| 2152 if( klass->is_obj_array_klass() && | |
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2153 tkls->offset() == in_bytes(ObjArrayKlass::element_klass_offset())) { |
| 0 | 2154 ciKlass* elem = klass->as_obj_array_klass()->element_klass(); |
| 2155 // // Always returning precise element type is incorrect, | |
| 2156 // // e.g., element type could be object and array may contain strings | |
| 2157 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0); | |
| 2158 | |
| 2159 // The array's TypeKlassPtr was declared 'precise' or 'not precise' | |
| 2160 // according to the element type's subclassing. | |
| 2161 return TypeKlassPtr::make(tkls->ptr(), elem, 0/*offset*/); | |
| 2162 } | |
| 2163 if( klass->is_instance_klass() && tkls->klass_is_exact() && | |
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2164 tkls->offset() == in_bytes(Klass::super_offset())) { |
| 0 | 2165 ciKlass* sup = klass->as_instance_klass()->super(); |
| 2166 // The field is Klass::_super. Return its (constant) value. | |
| 2167 // (Folds up the 2nd indirection in aClassConstant.getSuperClass().) | |
| 2168 return sup ? TypeKlassPtr::make(sup) : TypePtr::NULL_PTR; | |
| 2169 } | |
| 2170 } | |
| 2171 | |
| 2172 // Bailout case | |
| 2173 return LoadNode::Value(phase); | |
| 2174 } | |
| 2175 | |
| 2176 //------------------------------Identity--------------------------------------- | |
| 2177 // To clean up reflective code, simplify k.java_mirror.as_klass to plain k. | |
| 2178 // Also feed through the klass in Allocate(...klass...)._klass. | |
| 2179 Node* LoadKlassNode::Identity( PhaseTransform *phase ) { | |
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2180 return klass_identity_common(phase); |
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2181 } |
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2182 |
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2183 Node* LoadNode::klass_identity_common(PhaseTransform *phase ) { |
| 0 | 2184 Node* x = LoadNode::Identity(phase); |
| 2185 if (x != this) return x; | |
| 2186 | |
| 2187 // Take apart the address into an oop and and offset. | |
| 2188 // Return 'this' if we cannot. | |
| 2189 Node* adr = in(MemNode::Address); | |
| 2190 intptr_t offset = 0; | |
| 2191 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
| 2192 if (base == NULL) return this; | |
| 2193 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr(); | |
| 2194 if (toop == NULL) return this; | |
| 2195 | |
| 2196 // We can fetch the klass directly through an AllocateNode. | |
| 2197 // This works even if the klass is not constant (clone or newArray). | |
| 2198 if (offset == oopDesc::klass_offset_in_bytes()) { | |
| 2199 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase); | |
| 2200 if (allocated_klass != NULL) { | |
| 2201 return allocated_klass; | |
| 2202 } | |
| 2203 } | |
| 2204 | |
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2205 // Simplify k.java_mirror.as_klass to plain k, where k is a Klass*. |
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2206 // Simplify ak.component_mirror.array_klass to plain ak, ak an ArrayKlass. |
| 0 | 2207 // See inline_native_Class_query for occurrences of these patterns. |
| 2208 // Java Example: x.getClass().isAssignableFrom(y) | |
| 2209 // Java Example: Array.newInstance(x.getClass().getComponentType(), n) | |
| 2210 // | |
| 2211 // This improves reflective code, often making the Class | |
| 2212 // mirror go completely dead. (Current exception: Class | |
| 2213 // mirrors may appear in debug info, but we could clean them out by | |
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2214 // introducing a new debug info operator for Klass*.java_mirror). |
| 0 | 2215 if (toop->isa_instptr() && toop->klass() == phase->C->env()->Class_klass() |
| 2216 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
| 2217 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
| 2218 // We are loading a special hidden field from a Class mirror, | |
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2219 // the field which points to its Klass or ArrayKlass metaobject. |
| 0 | 2220 if (base->is_Load()) { |
| 2221 Node* adr2 = base->in(MemNode::Address); | |
| 2222 const TypeKlassPtr* tkls = phase->type(adr2)->isa_klassptr(); | |
| 2223 if (tkls != NULL && !tkls->empty() | |
| 2224 && (tkls->klass()->is_instance_klass() || | |
| 2225 tkls->klass()->is_array_klass()) | |
| 2226 && adr2->is_AddP() | |
| 2227 ) { | |
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2228 int mirror_field = in_bytes(Klass::java_mirror_offset()); |
| 0 | 2229 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { |
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2230 mirror_field = in_bytes(ArrayKlass::component_mirror_offset()); |
| 0 | 2231 } |
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2232 if (tkls->offset() == mirror_field) { |
| 0 | 2233 return adr2->in(AddPNode::Base); |
| 2234 } | |
| 2235 } | |
| 2236 } | |
| 2237 } | |
| 2238 | |
| 2239 return this; | |
| 2240 } | |
| 2241 | |
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2242 |
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2243 //------------------------------Value------------------------------------------ |
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2244 const Type *LoadNKlassNode::Value( PhaseTransform *phase ) const { |
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2245 const Type *t = klass_value_common(phase); |
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2246 if (t == Type::TOP) |
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2247 return t; |
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2248 |
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2249 return t->make_narrowklass(); |
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2250 } |
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2251 |
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2252 //------------------------------Identity--------------------------------------- |
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2253 // To clean up reflective code, simplify k.java_mirror.as_klass to narrow k. |
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2254 // Also feed through the klass in Allocate(...klass...)._klass. |
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2255 Node* LoadNKlassNode::Identity( PhaseTransform *phase ) { |
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2256 Node *x = klass_identity_common(phase); |
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2257 |
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2258 const Type *t = phase->type( x ); |
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2259 if( t == Type::TOP ) return x; |
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2260 if( t->isa_narrowklass()) return x; |
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2261 assert (!t->isa_narrowoop(), "no narrow oop here"); |
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2262 |
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2263 return phase->transform(new (phase->C) EncodePKlassNode(x, t->make_narrowklass())); |
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2264 } |
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2265 |
| 0 | 2266 //------------------------------Value----------------------------------------- |
| 2267 const Type *LoadRangeNode::Value( PhaseTransform *phase ) const { | |
| 2268 // Either input is TOP ==> the result is TOP | |
| 2269 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
| 2270 if( t1 == Type::TOP ) return Type::TOP; | |
| 2271 Node *adr = in(MemNode::Address); | |
| 2272 const Type *t2 = phase->type( adr ); | |
| 2273 if( t2 == Type::TOP ) return Type::TOP; | |
| 2274 const TypePtr *tp = t2->is_ptr(); | |
| 2275 if (TypePtr::above_centerline(tp->ptr())) return Type::TOP; | |
| 2276 const TypeAryPtr *tap = tp->isa_aryptr(); | |
| 2277 if( !tap ) return _type; | |
| 2278 return tap->size(); | |
| 2279 } | |
| 2280 | |
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2281 //-------------------------------Ideal--------------------------------------- |
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2282 // Feed through the length in AllocateArray(...length...)._length. |
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2283 Node *LoadRangeNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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2284 Node* p = MemNode::Ideal_common(phase, can_reshape); |
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2285 if (p) return (p == NodeSentinel) ? NULL : p; |
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2286 |
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2287 // Take apart the address into an oop and and offset. |
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2288 // Return 'this' if we cannot. |
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2289 Node* adr = in(MemNode::Address); |
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2290 intptr_t offset = 0; |
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2291 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); |
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2292 if (base == NULL) return NULL; |
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2293 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); |
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2294 if (tary == NULL) return NULL; |
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2295 |
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2296 // We can fetch the length directly through an AllocateArrayNode. |
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2297 // This works even if the length is not constant (clone or newArray). |
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2298 if (offset == arrayOopDesc::length_offset_in_bytes()) { |
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2299 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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2300 if (alloc != NULL) { |
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2301 Node* allocated_length = alloc->Ideal_length(); |
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2302 Node* len = alloc->make_ideal_length(tary, phase); |
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2303 if (allocated_length != len) { |
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2304 // New CastII improves on this. |
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2305 return len; |
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2306 } |
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2307 } |
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2308 } |
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2309 |
|
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2310 return NULL; |
|
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2311 } |
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2312 |
| 0 | 2313 //------------------------------Identity--------------------------------------- |
| 2314 // Feed through the length in AllocateArray(...length...)._length. | |
| 2315 Node* LoadRangeNode::Identity( PhaseTransform *phase ) { | |
| 2316 Node* x = LoadINode::Identity(phase); | |
| 2317 if (x != this) return x; | |
| 2318 | |
| 2319 // Take apart the address into an oop and and offset. | |
| 2320 // Return 'this' if we cannot. | |
| 2321 Node* adr = in(MemNode::Address); | |
| 2322 intptr_t offset = 0; | |
| 2323 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
| 2324 if (base == NULL) return this; | |
| 2325 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); | |
| 2326 if (tary == NULL) return this; | |
| 2327 | |
| 2328 // We can fetch the length directly through an AllocateArrayNode. | |
| 2329 // This works even if the length is not constant (clone or newArray). | |
| 2330 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
|
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2331 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
|
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2332 if (alloc != NULL) { |
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2333 Node* allocated_length = alloc->Ideal_length(); |
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2334 // Do not allow make_ideal_length to allocate a CastII node. |
|
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2335 Node* len = alloc->make_ideal_length(tary, phase, false); |
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2336 if (allocated_length == len) { |
|
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2337 // Return allocated_length only if it would not be improved by a CastII. |
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2338 return allocated_length; |
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2339 } |
| 0 | 2340 } |
| 2341 } | |
| 2342 | |
| 2343 return this; | |
| 2344 | |
| 2345 } | |
|
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2346 |
| 0 | 2347 //============================================================================= |
| 2348 //---------------------------StoreNode::make----------------------------------- | |
| 2349 // Polymorphic factory method: | |
|
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2350 StoreNode* StoreNode::make( PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, BasicType bt ) { |
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2351 Compile* C = gvn.C; |
| 1609 | 2352 assert( C->get_alias_index(adr_type) != Compile::AliasIdxRaw || |
| 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); |
|
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2358 case T_INT: return new (C) StoreINode(ctl, mem, adr, adr_type, val); |
| 0 | 2359 case T_CHAR: |
|
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2360 case T_SHORT: return new (C) StoreCNode(ctl, mem, adr, adr_type, val); |
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2361 case T_LONG: return new (C) StoreLNode(ctl, mem, adr, adr_type, val); |
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2362 case T_FLOAT: return new (C) StoreFNode(ctl, mem, adr, adr_type, val); |
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2363 case T_DOUBLE: return new (C) StoreDNode(ctl, mem, adr, adr_type, val); |
|
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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); |
|
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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); |
|
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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); |
|
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2380 } |
| 0 | 2381 } |
| 2382 ShouldNotReachHere(); | |
| 2383 return (StoreNode*)NULL; | |
| 2384 } | |
| 2385 | |
| 2386 StoreLNode* StoreLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val) { | |
| 2387 bool require_atomic = true; | |
|
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|
2388 return new (C) StoreLNode(ctl, mem, adr, adr_type, val, 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 | |
|
985
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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); | |
|
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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 ) { | |
|
68
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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); |
| 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); |
| 0 | 2787 } |
| 2788 return mem; | |
| 2789 } | |
| 2790 | |
|
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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); |
| 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
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
never
parents:
64
diff
changeset
|
2844 if (start_offset == end_offset) { |
|
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
never
parents:
64
diff
changeset
|
2845 // nothing to do |
|
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
never
parents:
64
diff
changeset
|
2846 return mem; |
|
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
never
parents:
64
diff
changeset
|
2847 } |
|
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
never
parents:
64
diff
changeset
|
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)); | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2857 zbase = phase->transform( new(C) URShiftXNode(zbase, shift) ); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2858 zend = phase->transform( new(C) URShiftXNode(zend, shift) ); |
| 0 | 2859 } |
| 2860 | |
|
7474
00af3a3a8df4
8005522: use fast-string instructions on x86 for zeroing
kvn
parents:
6853
diff
changeset
|
2861 // Bulk clear double-words |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2862 Node* zsize = phase->transform( new(C) SubXNode(zend, zbase) ); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2863 Node* adr = phase->transform( new(C) AddPNode(dest, dest, start_offset) ); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
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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6676841: ClearArrayNode::Identity is incorrect for 64-bit
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parents:
64
diff
changeset
|
2872 if (start_offset == end_offset) { |
|
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
never
parents:
64
diff
changeset
|
2873 // nothing to do |
|
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
never
parents:
64
diff
changeset
|
2874 return mem; |
|
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
never
parents:
64
diff
changeset
|
2875 } |
|
daf38130e60d
6676841: ClearArrayNode::Identity is incorrect for 64-bit
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parents:
64
diff
changeset
|
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 | |
|
6804
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7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2888 Node* adr = new (C) AddPNode(dest, dest, phase->MakeConX(done_offset)); |
| 0 | 2889 adr = phase->transform(adr); |
| 2890 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
82
diff
changeset
|
2891 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
| 0 | 2892 mem = phase->transform(mem); |
| 2893 done_offset += BytesPerInt; | |
| 2894 } | |
| 2895 assert(done_offset == end_offset, ""); | |
| 2896 return mem; | |
| 2897 } | |
| 2898 | |
| 2899 //============================================================================= | |
|
2412
f9424955eb18
7029152: Ideal nodes for String intrinsics miss memory edge optimization
kvn
parents:
2379
diff
changeset
|
2900 // Do not match memory edge. |
|
f9424955eb18
7029152: Ideal nodes for String intrinsics miss memory edge optimization
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parents:
2379
diff
changeset
|
2901 uint StrIntrinsicNode::match_edge(uint idx) const { |
|
f9424955eb18
7029152: Ideal nodes for String intrinsics miss memory edge optimization
kvn
parents:
2379
diff
changeset
|
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 | |
|
2412
f9424955eb18
7029152: Ideal nodes for String intrinsics miss memory edge optimization
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parents:
2379
diff
changeset
|
2908 Node *StrIntrinsicNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
|
f9424955eb18
7029152: Ideal nodes for String intrinsics miss memory edge optimization
kvn
parents:
2379
diff
changeset
|
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; | |
|
2412
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7029152: Ideal nodes for String intrinsics miss memory edge optimization
kvn
parents:
2379
diff
changeset
|
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 } | |
|
2412
f9424955eb18
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parents:
2379
diff
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|
2923 return NULL; |
|
169
9148c65abefc
6695049: (coll) Create an x86 intrinsic for Arrays.equals
rasbold
parents:
168
diff
changeset
|
2924 } |
|
9148c65abefc
6695049: (coll) Create an x86 intrinsic for Arrays.equals
rasbold
parents:
168
diff
changeset
|
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 //============================================================================= |
|
7637
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2933 //------------------------------match_edge------------------------------------- |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2934 // Do not match memory edge |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2935 uint EncodeISOArrayNode::match_edge(uint idx) const { |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2936 return idx == 2 || idx == 3; // EncodeISOArray src (Binary dst len) |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2937 } |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2938 |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2939 //------------------------------Ideal------------------------------------------ |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2940 // Return a node which is more "ideal" than the current node. Strip out |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2941 // control copies |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2942 Node *EncodeISOArrayNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2943 return remove_dead_region(phase, can_reshape) ? this : NULL; |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2944 } |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2945 |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2946 //------------------------------Value------------------------------------------ |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2947 const Type *EncodeISOArrayNode::Value(PhaseTransform *phase) const { |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2948 if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP; |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2949 return bottom_type(); |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2950 } |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
2951 |
|
b30b3c2a0cf2
6896617: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() on x86
kvn
parents:
7474
diff
changeset
|
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) { | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2975 case Op_MemBarAcquire: return new(C) MemBarAcquireNode(C, atp, pn); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2976 case Op_MemBarRelease: return new(C) MemBarReleaseNode(C, atp, pn); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2977 case Op_MemBarAcquireLock: return new(C) MemBarAcquireLockNode(C, atp, pn); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2978 case Op_MemBarReleaseLock: return new(C) MemBarReleaseLockNode(C, atp, pn); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2979 case Op_MemBarVolatile: return new(C) MemBarVolatileNode(C, atp, pn); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2980 case Op_MemBarCPUOrder: return new(C) MemBarCPUOrderNode(C, atp, pn); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2981 case Op_Initialize: return new(C) InitializeNode(C, atp, pn); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
2982 case Op_MemBarStoreStore: return new(C) MemBarStoreStoreNode(C, atp, pn); |
| 0 | 2983 default: ShouldNotReachHere(); return NULL; |
| 2984 } | |
| 2985 } | |
| 2986 | |
| 2987 //------------------------------Ideal------------------------------------------ | |
| 2988 // Return a node which is more "ideal" than the current node. Strip out | |
| 2989 // control copies | |
| 2990 Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
|
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2991 if (remove_dead_region(phase, can_reshape)) return this; |
| 4115 | 2992 // Don't bother trying to transform a dead node |
|
11005
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
parents:
10278
diff
changeset
|
2993 if (in(0) && in(0)->is_top()) { |
|
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
parents:
10278
diff
changeset
|
2994 return NULL; |
|
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
parents:
10278
diff
changeset
|
2995 } |
|
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2996 |
|
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
2997 // Eliminate volatile MemBars for scalar replaced objects. |
| 10278 | 2998 if (can_reshape && req() == (Precedent+1)) { |
| 2999 bool eliminate = false; | |
| 3000 int opc = Opcode(); | |
| 3001 if ((opc == Op_MemBarAcquire || opc == Op_MemBarVolatile)) { | |
| 3002 // Volatile field loads and stores. | |
| 3003 Node* my_mem = in(MemBarNode::Precedent); | |
|
11005
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
parents:
10278
diff
changeset
|
3004 // The MembarAquire may keep an unused LoadNode alive through the Precedent edge |
|
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
parents:
10278
diff
changeset
|
3005 if ((my_mem != NULL) && (opc == Op_MemBarAcquire) && (my_mem->outcnt() == 1)) { |
| 11044 | 3006 // if the Precedent is a decodeN and its input (a Load) is used at more than one place, |
| 3007 // replace this Precedent (decodeN) with the Load instead. | |
| 3008 if ((my_mem->Opcode() == Op_DecodeN) && (my_mem->in(1)->outcnt() > 1)) { | |
| 3009 Node* load_node = my_mem->in(1); | |
| 3010 set_req(MemBarNode::Precedent, load_node); | |
| 3011 phase->is_IterGVN()->_worklist.push(my_mem); | |
| 3012 my_mem = load_node; | |
| 3013 } else { | |
| 3014 assert(my_mem->unique_out() == this, "sanity"); | |
| 3015 del_req(Precedent); | |
| 3016 phase->is_IterGVN()->_worklist.push(my_mem); // remove dead node later | |
| 3017 my_mem = NULL; | |
| 3018 } | |
|
11005
08d35fd1b599
8001345: VM crashes with assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
adlertz
parents:
10278
diff
changeset
|
3019 } |
| 10278 | 3020 if (my_mem != NULL && my_mem->is_Mem()) { |
| 3021 const TypeOopPtr* t_oop = my_mem->in(MemNode::Address)->bottom_type()->isa_oopptr(); | |
| 3022 // Check for scalar replaced object reference. | |
| 3023 if( t_oop != NULL && t_oop->is_known_instance_field() && | |
| 3024 t_oop->offset() != Type::OffsetBot && | |
| 3025 t_oop->offset() != Type::OffsetTop) { | |
| 3026 eliminate = true; | |
| 3027 } | |
|
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
3028 } |
| 10278 | 3029 } else if (opc == Op_MemBarRelease) { |
| 3030 // Final field stores. | |
| 3031 Node* alloc = AllocateNode::Ideal_allocation(in(MemBarNode::Precedent), phase); | |
| 3032 if ((alloc != NULL) && alloc->is_Allocate() && | |
| 3033 alloc->as_Allocate()->_is_non_escaping) { | |
| 3034 // The allocated object does not escape. | |
| 3035 eliminate = true; | |
| 3036 } | |
| 3037 } | |
| 3038 if (eliminate) { | |
| 3039 // Replace MemBar projections by its inputs. | |
| 3040 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
| 3041 igvn->replace_node(proj_out(TypeFunc::Memory), in(TypeFunc::Memory)); | |
| 3042 igvn->replace_node(proj_out(TypeFunc::Control), in(TypeFunc::Control)); | |
| 3043 // Must return either the original node (now dead) or a new node | |
| 3044 // (Do not return a top here, since that would break the uniqueness of top.) | |
| 3045 return new (phase->C) ConINode(TypeInt::ZERO); | |
|
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
3046 } |
|
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
3047 } |
|
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
3048 return NULL; |
| 0 | 3049 } |
| 3050 | |
| 3051 //------------------------------Value------------------------------------------ | |
| 3052 const Type *MemBarNode::Value( PhaseTransform *phase ) const { | |
| 3053 if( !in(0) ) return Type::TOP; | |
| 3054 if( phase->type(in(0)) == Type::TOP ) | |
| 3055 return Type::TOP; | |
| 3056 return TypeTuple::MEMBAR; | |
| 3057 } | |
| 3058 | |
| 3059 //------------------------------match------------------------------------------ | |
| 3060 // Construct projections for memory. | |
| 3061 Node *MemBarNode::match( const ProjNode *proj, const Matcher *m ) { | |
| 3062 switch (proj->_con) { | |
| 3063 case TypeFunc::Control: | |
| 3064 case TypeFunc::Memory: | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6795
diff
changeset
|
3065 return new (m->C) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); |
| 0 | 3066 } |
| 3067 ShouldNotReachHere(); | |
| 3068 return NULL; | |
| 3069 } | |
| 3070 | |
| 3071 //===========================InitializeNode==================================== | |
| 3072 // SUMMARY: | |
| 3073 // This node acts as a memory barrier on raw memory, after some raw stores. | |
| 3074 // The 'cooked' oop value feeds from the Initialize, not the Allocation. | |
| 3075 // The Initialize can 'capture' suitably constrained stores as raw inits. | |
| 3076 // It can coalesce related raw stores into larger units (called 'tiles'). | |
| 3077 // It can avoid zeroing new storage for memory units which have raw inits. | |
| 3078 // At macro-expansion, it is marked 'complete', and does not optimize further. | |
| 3079 // | |
| 3080 // EXAMPLE: | |
| 3081 // The object 'new short[2]' occupies 16 bytes in a 32-bit machine. | |
| 3082 // ctl = incoming control; mem* = incoming memory | |
| 3083 // (Note: A star * on a memory edge denotes I/O and other standard edges.) | |
| 3084 // First allocate uninitialized memory and fill in the header: | |
| 3085 // alloc = (Allocate ctl mem* 16 #short[].klass ...) | |
| 3086 // ctl := alloc.Control; mem* := alloc.Memory* | |
| 3087 // rawmem = alloc.Memory; rawoop = alloc.RawAddress | |
| 3088 // Then initialize to zero the non-header parts of the raw memory block: | |
| 3089 // init = (Initialize alloc.Control alloc.Memory* alloc.RawAddress) | |
| 3090 // ctl := init.Control; mem.SLICE(#short[*]) := init.Memory | |
| 3091 // After the initialize node executes, the object is ready for service: | |
| 3092 // oop := (CheckCastPP init.Control alloc.RawAddress #short[]) | |
| 3093 // Suppose its body is immediately initialized as {1,2}: | |
| 3094 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
| 3095 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
| 3096 // mem.SLICE(#short[*]) := store2 | |
| 3097 // | |
| 3098 // DETAILS: | |
| 3099 // An InitializeNode collects and isolates object initialization after | |
| 3100 // an AllocateNode and before the next possible safepoint. As a | |
| 3101 // memory barrier (MemBarNode), it keeps critical stores from drifting | |
| 3102 // down past any safepoint or any publication of the allocation. | |
| 3103 // Before this barrier, a newly-allocated object may have uninitialized bits. | |
| 3104 // After this barrier, it may be treated as a real oop, and GC is allowed. | |
| 3105 // | |
| 3106 // The semantics of the InitializeNode include an implicit zeroing of | |
| 3107 // the new object from object header to the end of the object. | |
| 3108 // (The object header and end are determined by the AllocateNode.) | |
| 3109 // | |
| 3110 // Certain stores may be added as direct inputs to the InitializeNode. | |
| 3111 // These stores must update raw memory, and they must be to addresses | |
| 3112 // derived from the raw address produced by AllocateNode, and with | |
| 3113 // a constant offset. They must be ordered by increasing offset. | |
| 3114 // The first one is at in(RawStores), the last at in(req()-1). | |
| 3115 // Unlike most memory operations, they are not linked in a chain, | |
| 3116 // but are displayed in parallel as users of the rawmem output of | |
| 3117 // the allocation. | |
| 3118 // | |
| 3119 // (See comments in InitializeNode::capture_store, which continue | |
| 3120 // the example given above.) | |
| 3121 // | |
| 3122 // When the associated Allocate is macro-expanded, the InitializeNode | |
| 3123 // may be rewritten to optimize collected stores. A ClearArrayNode | |
| 3124 // may also be created at that point to represent any required zeroing. | |
| 3125 // The InitializeNode is then marked 'complete', prohibiting further | |
| 3126 // capturing of nearby memory operations. | |
| 3127 // | |
| 3128 // During macro-expansion, all captured initializations which store | |
| 605 | 3129 // constant values of 32 bits or smaller are coalesced (if advantageous) |
| 0 | 3130 // into larger 'tiles' 32 or 64 bits. This allows an object to be |
| 3131 // initialized in fewer memory operations. Memory words which are | |
| 3132 // covered by neither tiles nor non-constant stores are pre-zeroed | |
| 3133 // by explicit stores of zero. (The code shape happens to do all | |
| 3134 // zeroing first, then all other stores, with both sequences occurring | |
| 3135 // in order of ascending offsets.) | |
| 3136 // | |
| 3137 // Alternatively, code may be inserted between an AllocateNode and its | |
| 3138 // InitializeNode, to perform arbitrary initialization of the new object. | |
| 3139 // E.g., the object copying intrinsics insert complex data transfers here. | |
| 3140 // The initialization must then be marked as 'complete' disable the | |
| 3141 // built-in zeroing semantics and the collection of initializing stores. | |
| 3142 // | |
| 3143 // While an InitializeNode is incomplete, reads from the memory state | |
| 3144 // produced by it are optimizable if they match the control edge and | |
| 3145 // new oop address associated with the allocation/initialization. | |
| 3146 // They return a stored value (if the offset matches) or else zero. | |
| 3147 // A write to the memory state, if it matches control and address, | |
| 3148 // and if it is to a constant offset, may be 'captured' by the | |
| 3149 // InitializeNode. It is cloned as a raw memory operation and rewired | |
| 3150 // inside the initialization, to the raw oop produced by the allocation. | |
| 3151 // Operations on addresses which are provably distinct (e.g., to | |
| 3152 // other AllocateNodes) are allowed to bypass the initialization. | |
| 3153 // | |
| 3154 // The effect of all this is to consolidate object initialization | |
| 3155 // (both arrays and non-arrays, both piecewise and bulk) into a | |
| 3156 // single location, where it can be optimized as a unit. | |
| 3157 // | |
| 3158 // Only stores with an offset less than TrackedInitializationLimit words | |
| 3159 // will be considered for capture by an InitializeNode. This puts a | |
| 3160 // reasonable limit on the complexity of optimized initializations. | |
| 3161 | |
| 3162 //---------------------------InitializeNode------------------------------------ | |
| 3163 InitializeNode::InitializeNode(Compile* C, int adr_type, Node* rawoop) | |
|
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3164 : _is_complete(Incomplete), _does_not_escape(false), |
| 0 | 3165 MemBarNode(C, adr_type, rawoop) |
| 3166 { | |
| 3167 init_class_id(Class_Initialize); | |
| 3168 | |
| 3169 assert(adr_type == Compile::AliasIdxRaw, "only valid atp"); | |
| 3170 assert(in(RawAddress) == rawoop, "proper init"); | |
| 3171 // Note: allocation() can be NULL, for secondary initialization barriers | |
| 3172 } | |
| 3173 | |
| 3174 // Since this node is not matched, it will be processed by the | |
| 3175 // register allocator. Declare that there are no constraints | |
| 3176 // on the allocation of the RawAddress edge. | |
| 3177 const RegMask &InitializeNode::in_RegMask(uint idx) const { | |
| 3178 // This edge should be set to top, by the set_complete. But be conservative. | |
| 3179 if (idx == InitializeNode::RawAddress) | |
| 3180 return *(Compile::current()->matcher()->idealreg2spillmask[in(idx)->ideal_reg()]); | |
| 3181 return RegMask::Empty; | |
| 3182 } | |
| 3183 | |
| 3184 Node* InitializeNode::memory(uint alias_idx) { | |
| 3185 Node* mem = in(Memory); | |
| 3186 if (mem->is_MergeMem()) { | |
| 3187 return mem->as_MergeMem()->memory_at(alias_idx); | |
| 3188 } else { | |
| 3189 // incoming raw memory is not split | |
| 3190 return mem; | |
| 3191 } | |
| 3192 } | |
| 3193 | |
| 3194 bool InitializeNode::is_non_zero() { | |
| 3195 if (is_complete()) return false; | |
| 3196 remove_extra_zeroes(); | |
| 3197 return (req() > RawStores); | |
| 3198 } | |
| 3199 | |
| 3200 void InitializeNode::set_complete(PhaseGVN* phase) { | |
| 3201 assert(!is_complete(), "caller responsibility"); | |
|
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3202 _is_complete = Complete; |
| 0 | 3203 |
| 3204 // After this node is complete, it contains a bunch of | |
| 3205 // raw-memory initializations. There is no need for | |
| 3206 // it to have anything to do with non-raw memory effects. | |
| 3207 // Therefore, tell all non-raw users to re-optimize themselves, | |
| 3208 // after skipping the memory effects of this initialization. | |
| 3209 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
| 3210 if (igvn) igvn->add_users_to_worklist(this); | |
| 3211 } | |
| 3212 | |
| 3213 // convenience function | |
| 3214 // return false if the init contains any stores already | |
| 3215 bool AllocateNode::maybe_set_complete(PhaseGVN* phase) { | |
| 3216 InitializeNode* init = initialization(); | |
| 3217 if (init == NULL || init->is_complete()) return false; | |
| 3218 init->remove_extra_zeroes(); | |
| 3219 // for now, if this allocation has already collected any inits, bail: | |
| 3220 if (init->is_non_zero()) return false; | |
| 3221 init->set_complete(phase); | |
| 3222 return true; | |
| 3223 } | |
| 3224 | |
| 3225 void InitializeNode::remove_extra_zeroes() { | |
| 3226 if (req() == RawStores) return; | |
| 3227 Node* zmem = zero_memory(); | |
| 3228 uint fill = RawStores; | |
| 3229 for (uint i = fill; i < req(); i++) { | |
| 3230 Node* n = in(i); | |
| 3231 if (n->is_top() || n == zmem) continue; // skip | |
| 3232 if (fill < i) set_req(fill, n); // compact | |
| 3233 ++fill; | |
| 3234 } | |
| 3235 // delete any empty spaces created: | |
| 3236 while (fill < req()) { | |
| 3237 del_req(fill); | |
| 3238 } | |
| 3239 } | |
| 3240 | |
| 3241 // Helper for remembering which stores go with which offsets. | |
| 3242 intptr_t InitializeNode::get_store_offset(Node* st, PhaseTransform* phase) { | |
| 3243 if (!st->is_Store()) return -1; // can happen to dead code via subsume_node | |
| 3244 intptr_t offset = -1; | |
| 3245 Node* base = AddPNode::Ideal_base_and_offset(st->in(MemNode::Address), | |
| 3246 phase, offset); | |
| 3247 if (base == NULL) return -1; // something is dead, | |
| 3248 if (offset < 0) return -1; // dead, dead | |
| 3249 return offset; | |
| 3250 } | |
| 3251 | |
| 3252 // Helper for proving that an initialization expression is | |
| 3253 // "simple enough" to be folded into an object initialization. | |
| 3254 // Attempts to prove that a store's initial value 'n' can be captured | |
| 3255 // within the initialization without creating a vicious cycle, such as: | |
| 3256 // { Foo p = new Foo(); p.next = p; } | |
| 3257 // True for constants and parameters and small combinations thereof. | |
| 10278 | 3258 bool InitializeNode::detect_init_independence(Node* n, int& count) { |
| 0 | 3259 if (n == NULL) return true; // (can this really happen?) |
| 3260 if (n->is_Proj()) n = n->in(0); | |
| 3261 if (n == this) return false; // found a cycle | |
| 3262 if (n->is_Con()) return true; | |
| 3263 if (n->is_Start()) return true; // params, etc., are OK | |
| 3264 if (n->is_Root()) return true; // even better | |
| 3265 | |
| 3266 Node* ctl = n->in(0); | |
| 3267 if (ctl != NULL && !ctl->is_top()) { | |
| 3268 if (ctl->is_Proj()) ctl = ctl->in(0); | |
| 3269 if (ctl == this) return false; | |
| 3270 | |
| 3271 // If we already know that the enclosing memory op is pinned right after | |
| 3272 // the init, then any control flow that the store has picked up | |
| 3273 // must have preceded the init, or else be equal to the init. | |
| 3274 // Even after loop optimizations (which might change control edges) | |
| 3275 // a store is never pinned *before* the availability of its inputs. | |
|
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|
3276 if (!MemNode::all_controls_dominate(n, this)) |
| 0 | 3277 return false; // failed to prove a good control |
| 3278 } | |
| 3279 | |
| 3280 // Check data edges for possible dependencies on 'this'. | |
| 3281 if ((count += 1) > 20) return false; // complexity limit | |
| 3282 for (uint i = 1; i < n->req(); i++) { | |
| 3283 Node* m = n->in(i); | |
| 3284 if (m == NULL || m == n || m->is_top()) continue; | |
| 3285 uint first_i = n->find_edge(m); | |
| 3286 if (i != first_i) continue; // process duplicate edge just once | |
| 10278 | 3287 if (!detect_init_independence(m, count)) { |
| 0 | 3288 return false; |
| 3289 } | |
| 3290 } | |
| 3291 | |
| 3292 return true; | |
| 3293 } | |
| 3294 | |
| 3295 // Here are all the checks a Store must pass before it can be moved into | |
| 3296 // an initialization. Returns zero if a check fails. | |
| 3297 // On success, returns the (constant) offset to which the store applies, | |
| 3298 // within the initialized memory. | |
|
8116
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|
3299 intptr_t InitializeNode::can_capture_store(StoreNode* st, PhaseTransform* phase, bool can_reshape) { |
| 0 | 3300 const int FAIL = 0; |
| 3301 if (st->req() != MemNode::ValueIn + 1) | |
| 3302 return FAIL; // an inscrutable StoreNode (card mark?) | |
| 3303 Node* ctl = st->in(MemNode::Control); | |
| 3304 if (!(ctl != NULL && ctl->is_Proj() && ctl->in(0) == this)) | |
| 3305 return FAIL; // must be unconditional after the initialization | |
| 3306 Node* mem = st->in(MemNode::Memory); | |
| 3307 if (!(mem->is_Proj() && mem->in(0) == this)) | |
| 3308 return FAIL; // must not be preceded by other stores | |
| 3309 Node* adr = st->in(MemNode::Address); | |
| 3310 intptr_t offset; | |
| 3311 AllocateNode* alloc = AllocateNode::Ideal_allocation(adr, phase, offset); | |
| 3312 if (alloc == NULL) | |
| 3313 return FAIL; // inscrutable address | |
| 3314 if (alloc != allocation()) | |
| 3315 return FAIL; // wrong allocation! (store needs to float up) | |
| 3316 Node* val = st->in(MemNode::ValueIn); | |
| 3317 int complexity_count = 0; | |
| 10278 | 3318 if (!detect_init_independence(val, complexity_count)) |
| 0 | 3319 return FAIL; // stored value must be 'simple enough' |
| 3320 | |
|
8116
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|
3321 // The Store can be captured only if nothing after the allocation |
|
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|
3322 // and before the Store is using the memory location that the store |
|
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|
3323 // overwrites. |
|
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|
3324 bool failed = false; |
|
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|
3325 // If is_complete_with_arraycopy() is true the shape of the graph is |
|
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|
3326 // well defined and is safe so no need for extra checks. |
|
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|
3327 if (!is_complete_with_arraycopy()) { |
|
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|
3328 // We are going to look at each use of the memory state following |
|
6931f425c517
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|
3329 // 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
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|
3330 // Store writes. |
|
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|
3331 const TypePtr* t_adr = phase->type(adr)->isa_ptr(); |
|
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|
3332 int alias_idx = phase->C->get_alias_index(t_adr); |
|
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3333 ResourceMark rm; |
|
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3334 Unique_Node_List mems; |
|
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3335 mems.push(mem); |
|
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3336 Node* unique_merge = NULL; |
|
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3337 for (uint next = 0; next < mems.size(); ++next) { |
|
6931f425c517
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|
3338 Node *m = mems.at(next); |
|
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|
3339 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { |
|
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3340 Node *n = m->fast_out(j); |
|
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3341 if (n->outcnt() == 0) { |
|
6931f425c517
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|
3342 continue; |
|
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|
3343 } |
|
6931f425c517
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|
3344 if (n == st) { |
|
6931f425c517
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roland
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diff
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|
3345 continue; |
|
6931f425c517
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diff
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|
3346 } else if (n->in(0) != NULL && n->in(0) != ctl) { |
|
6931f425c517
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|
3347 // If the control of this use is different from the control |
|
6931f425c517
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diff
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|
3348 // of the Store which is right after the InitializeNode then |
|
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3349 // this node cannot be between the InitializeNode and the |
|
6931f425c517
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diff
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|
3350 // Store. |
|
6931f425c517
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|
3351 continue; |
|
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|
3352 } else if (n->is_MergeMem()) { |
|
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|
3353 if (n->as_MergeMem()->memory_at(alias_idx) == m) { |
|
6931f425c517
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|
3354 // We can hit a MergeMemNode (that will likely go away |
|
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|
3355 // later) that is a direct use of the memory state |
|
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|
3356 // following the InitializeNode on the same slice as the |
|
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|
3357 // store node that we'd like to capture. We need to check |
|
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|
3358 // the uses of the MergeMemNode. |
|
6931f425c517
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|
3359 mems.push(n); |
|
6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
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|
3360 } |
|
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|
3361 } else if (n->is_Mem()) { |
|
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|
3362 Node* other_adr = n->in(MemNode::Address); |
|
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|
3363 if (other_adr == adr) { |
|
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|
3364 failed = true; |
|
6931f425c517
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roland
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|
3365 break; |
|
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diff
changeset
|
3366 } else { |
|
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changeset
|
3367 const TypePtr* other_t_adr = phase->type(other_adr)->isa_ptr(); |
|
6931f425c517
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|
3368 if (other_t_adr != NULL) { |
|
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|
3369 int other_alias_idx = phase->C->get_alias_index(other_t_adr); |
|
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|
3370 if (other_alias_idx == alias_idx) { |
|
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|
3371 // A load from the same memory slice as the store right |
|
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|
3372 // after the InitializeNode. We check the control of the |
|
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3373 // object/array that is loaded from. If it's the same as |
|
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3374 // the store control then we cannot capture the store. |
|
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|
3375 assert(!n->is_Store(), "2 stores to same slice on same control?"); |
|
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|
3376 Node* base = other_adr; |
|
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|
3377 assert(base->is_AddP(), err_msg_res("should be addp but is %s", base->Name())); |
|
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3378 base = base->in(AddPNode::Base); |
|
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|
3379 if (base != NULL) { |
|
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|
3380 base = base->uncast(); |
|
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|
3381 if (base->is_Proj() && base->in(0) == alloc) { |
|
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|
3382 failed = true; |
|
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|
3383 break; |
|
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|
3384 } |
|
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|
3385 } |
|
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|
3386 } |
|
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|
3387 } |
|
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|
3388 } |
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|
3389 } else { |
|
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|
3390 failed = true; |
|
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|
3391 break; |
|
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|
3392 } |
|
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|
3393 } |
|
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|
3394 } |
|
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|
3395 } |
|
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|
3396 if (failed) { |
|
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|
3397 if (!can_reshape) { |
|
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|
3398 // We decided we couldn't capture the store during parsing. We |
|
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|
3399 // should try again during the next IGVN once the graph is |
|
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|
3400 // cleaner. |
|
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|
3401 phase->C->record_for_igvn(st); |
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|
3402 } |
|
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|
3403 return FAIL; |
|
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|
3404 } |
|
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|
3405 |
| 0 | 3406 return offset; // success |
| 3407 } | |
| 3408 | |
| 3409 // Find the captured store in(i) which corresponds to the range | |
| 3410 // [start..start+size) in the initialized object. | |
| 3411 // If there is one, return its index i. If there isn't, return the | |
| 3412 // negative of the index where it should be inserted. | |
| 3413 // Return 0 if the queried range overlaps an initialization boundary | |
| 3414 // or if dead code is encountered. | |
| 3415 // If size_in_bytes is zero, do not bother with overlap checks. | |
| 3416 int InitializeNode::captured_store_insertion_point(intptr_t start, | |
| 3417 int size_in_bytes, | |
| 3418 PhaseTransform* phase) { | |
| 3419 const int FAIL = 0, MAX_STORE = BytesPerLong; | |
| 3420 | |
| 3421 if (is_complete()) | |
| 3422 return FAIL; // arraycopy got here first; punt | |
| 3423 | |
| 3424 assert(allocation() != NULL, "must be present"); | |
| 3425 | |
| 3426 // no negatives, no header fields: | |
|
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diff
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|
3427 if (start < (intptr_t) allocation()->minimum_header_size()) return FAIL; |
| 0 | 3428 |
| 3429 // after a certain size, we bail out on tracking all the stores: | |
| 3430 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
| 3431 if (start >= ti_limit) return FAIL; | |
| 3432 | |
| 3433 for (uint i = InitializeNode::RawStores, limit = req(); ; ) { | |
| 3434 if (i >= limit) return -(int)i; // not found; here is where to put it | |
| 3435 | |
| 3436 Node* st = in(i); | |
| 3437 intptr_t st_off = get_store_offset(st, phase); | |
| 3438 if (st_off < 0) { | |
| 3439 if (st != zero_memory()) { | |
| 3440 return FAIL; // bail out if there is dead garbage | |
| 3441 } | |
| 3442 } else if (st_off > start) { | |
| 3443 // ...we are done, since stores are ordered | |
| 3444 if (st_off < start + size_in_bytes) { | |
| 3445 return FAIL; // the next store overlaps | |
| 3446 } | |
| 3447 return -(int)i; // not found; here is where to put it | |
| 3448 } else if (st_off < start) { | |
| 3449 if (size_in_bytes != 0 && | |
| 3450 start < st_off + MAX_STORE && | |
| 3451 start < st_off + st->as_Store()->memory_size()) { | |
| 3452 return FAIL; // the previous store overlaps | |
| 3453 } | |
| 3454 } else { | |
| 3455 if (size_in_bytes != 0 && | |
| 3456 st->as_Store()->memory_size() != size_in_bytes) { | |
| 3457 return FAIL; // mismatched store size | |
| 3458 } | |
| 3459 return i; | |
| 3460 } | |
| 3461 | |
| 3462 ++i; | |
| 3463 } | |
| 3464 } | |
| 3465 | |
| 3466 // Look for a captured store which initializes at the offset 'start' | |
| 3467 // with the given size. If there is no such store, and no other | |
| 3468 // initialization interferes, then return zero_memory (the memory | |
| 3469 // projection of the AllocateNode). | |
| 3470 Node* InitializeNode::find_captured_store(intptr_t start, int size_in_bytes, | |
| 3471 PhaseTransform* phase) { | |
| 3472 assert(stores_are_sane(phase), ""); | |
| 3473 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
| 3474 if (i == 0) { | |
| 3475 return NULL; // something is dead | |
| 3476 } else if (i < 0) { | |
| 3477 return zero_memory(); // just primordial zero bits here | |
| 3478 } else { | |
| 3479 Node* st = in(i); // here is the store at this position | |
| 3480 assert(get_store_offset(st->as_Store(), phase) == start, "sanity"); | |
| 3481 return st; | |
| 3482 } | |
| 3483 } | |
| 3484 | |
| 3485 // Create, as a raw pointer, an address within my new object at 'offset'. | |
| 3486 Node* InitializeNode::make_raw_address(intptr_t offset, | |
| 3487 PhaseTransform* phase) { | |
| 3488 Node* addr = in(RawAddress); | |
| 3489 if (offset != 0) { | |
| 3490 Compile* C = phase->C; | |
|
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|
3491 addr = phase->transform( new (C) AddPNode(C->top(), addr, |
| 0 | 3492 phase->MakeConX(offset)) ); |
| 3493 } | |
| 3494 return addr; | |
| 3495 } | |
| 3496 | |
| 3497 // Clone the given store, converting it into a raw store | |
| 3498 // initializing a field or element of my new object. | |
| 3499 // Caller is responsible for retiring the original store, | |
| 3500 // with subsume_node or the like. | |
| 3501 // | |
| 3502 // From the example above InitializeNode::InitializeNode, | |
| 3503 // here are the old stores to be captured: | |
| 3504 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
| 3505 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
| 3506 // | |
| 3507 // Here is the changed code; note the extra edges on init: | |
| 3508 // alloc = (Allocate ...) | |
| 3509 // rawoop = alloc.RawAddress | |
| 3510 // rawstore1 = (StoreC alloc.Control alloc.Memory (+ rawoop 12) 1) | |
| 3511 // rawstore2 = (StoreC alloc.Control alloc.Memory (+ rawoop 14) 2) | |
| 3512 // init = (Initialize alloc.Control alloc.Memory rawoop | |
| 3513 // rawstore1 rawstore2) | |
| 3514 // | |
| 3515 Node* InitializeNode::capture_store(StoreNode* st, intptr_t start, | |
|
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|
3516 PhaseTransform* phase, bool can_reshape) { |
| 0 | 3517 assert(stores_are_sane(phase), ""); |
| 3518 | |
| 3519 if (start < 0) return NULL; | |
|
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|
3520 assert(can_capture_store(st, phase, can_reshape) == start, "sanity"); |
| 0 | 3521 |
| 3522 Compile* C = phase->C; | |
| 3523 int size_in_bytes = st->memory_size(); | |
| 3524 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
| 3525 if (i == 0) return NULL; // bail out | |
| 3526 Node* prev_mem = NULL; // raw memory for the captured store | |
| 3527 if (i > 0) { | |
| 3528 prev_mem = in(i); // there is a pre-existing store under this one | |
| 3529 set_req(i, C->top()); // temporarily disconnect it | |
| 3530 // See StoreNode::Ideal 'st->outcnt() == 1' for the reason to disconnect. | |
| 3531 } else { | |
| 3532 i = -i; // no pre-existing store | |
| 3533 prev_mem = zero_memory(); // a slice of the newly allocated object | |
| 3534 if (i > InitializeNode::RawStores && in(i-1) == prev_mem) | |
| 3535 set_req(--i, C->top()); // reuse this edge; it has been folded away | |
| 3536 else | |
| 3537 ins_req(i, C->top()); // build a new edge | |
| 3538 } | |
| 3539 Node* new_st = st->clone(); | |
| 3540 new_st->set_req(MemNode::Control, in(Control)); | |
| 3541 new_st->set_req(MemNode::Memory, prev_mem); | |
| 3542 new_st->set_req(MemNode::Address, make_raw_address(start, phase)); | |
| 3543 new_st = phase->transform(new_st); | |
| 3544 | |
| 3545 // At this point, new_st might have swallowed a pre-existing store | |
| 3546 // at the same offset, or perhaps new_st might have disappeared, | |
| 3547 // if it redundantly stored the same value (or zero to fresh memory). | |
| 3548 | |
| 3549 // In any case, wire it in: | |
| 3550 set_req(i, new_st); | |
| 3551 | |
| 3552 // The caller may now kill the old guy. | |
| 3553 DEBUG_ONLY(Node* check_st = find_captured_store(start, size_in_bytes, phase)); | |
| 3554 assert(check_st == new_st || check_st == NULL, "must be findable"); | |
| 3555 assert(!is_complete(), ""); | |
| 3556 return new_st; | |
| 3557 } | |
| 3558 | |
| 3559 static bool store_constant(jlong* tiles, int num_tiles, | |
| 3560 intptr_t st_off, int st_size, | |
| 3561 jlong con) { | |
| 3562 if ((st_off & (st_size-1)) != 0) | |
| 3563 return false; // strange store offset (assume size==2**N) | |
| 3564 address addr = (address)tiles + st_off; | |
| 3565 assert(st_off >= 0 && addr+st_size <= (address)&tiles[num_tiles], "oob"); | |
| 3566 switch (st_size) { | |
| 3567 case sizeof(jbyte): *(jbyte*) addr = (jbyte) con; break; | |
| 3568 case sizeof(jchar): *(jchar*) addr = (jchar) con; break; | |
| 3569 case sizeof(jint): *(jint*) addr = (jint) con; break; | |
| 3570 case sizeof(jlong): *(jlong*) addr = (jlong) con; break; | |
| 3571 default: return false; // strange store size (detect size!=2**N here) | |
| 3572 } | |
| 3573 return true; // return success to caller | |
| 3574 } | |
| 3575 | |
| 3576 // Coalesce subword constants into int constants and possibly | |
| 3577 // into long constants. The goal, if the CPU permits, | |
| 3578 // is to initialize the object with a small number of 64-bit tiles. | |
| 3579 // Also, convert floating-point constants to bit patterns. | |
| 3580 // Non-constants are not relevant to this pass. | |
| 3581 // | |
| 3582 // In terms of the running example on InitializeNode::InitializeNode | |
| 3583 // and InitializeNode::capture_store, here is the transformation | |
| 3584 // of rawstore1 and rawstore2 into rawstore12: | |
| 3585 // alloc = (Allocate ...) | |
| 3586 // rawoop = alloc.RawAddress | |
| 3587 // tile12 = 0x00010002 | |
| 3588 // rawstore12 = (StoreI alloc.Control alloc.Memory (+ rawoop 12) tile12) | |
| 3589 // init = (Initialize alloc.Control alloc.Memory rawoop rawstore12) | |
| 3590 // | |
| 3591 void | |
| 3592 InitializeNode::coalesce_subword_stores(intptr_t header_size, | |
| 3593 Node* size_in_bytes, | |
| 3594 PhaseGVN* phase) { | |
| 3595 Compile* C = phase->C; | |
| 3596 | |
| 3597 assert(stores_are_sane(phase), ""); | |
| 3598 // Note: After this pass, they are not completely sane, | |
| 3599 // since there may be some overlaps. | |
| 3600 | |
| 3601 int old_subword = 0, old_long = 0, new_int = 0, new_long = 0; | |
| 3602 | |
| 3603 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
| 3604 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, ti_limit); | |
| 3605 size_limit = MIN2(size_limit, ti_limit); | |
| 3606 size_limit = align_size_up(size_limit, BytesPerLong); | |
| 3607 int num_tiles = size_limit / BytesPerLong; | |
| 3608 | |
| 3609 // allocate space for the tile map: | |
| 3610 const int small_len = DEBUG_ONLY(true ? 3 :) 30; // keep stack frames small | |
| 3611 jlong tiles_buf[small_len]; | |
| 3612 Node* nodes_buf[small_len]; | |
| 3613 jlong inits_buf[small_len]; | |
| 3614 jlong* tiles = ((num_tiles <= small_len) ? &tiles_buf[0] | |
| 3615 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
| 3616 Node** nodes = ((num_tiles <= small_len) ? &nodes_buf[0] | |
| 3617 : NEW_RESOURCE_ARRAY(Node*, num_tiles)); | |
| 3618 jlong* inits = ((num_tiles <= small_len) ? &inits_buf[0] | |
| 3619 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
| 3620 // tiles: exact bitwise model of all primitive constants | |
| 3621 // nodes: last constant-storing node subsumed into the tiles model | |
| 3622 // inits: which bytes (in each tile) are touched by any initializations | |
| 3623 | |
| 3624 //// Pass A: Fill in the tile model with any relevant stores. | |
| 3625 | |
| 3626 Copy::zero_to_bytes(tiles, sizeof(tiles[0]) * num_tiles); | |
| 3627 Copy::zero_to_bytes(nodes, sizeof(nodes[0]) * num_tiles); | |
| 3628 Copy::zero_to_bytes(inits, sizeof(inits[0]) * num_tiles); | |
| 3629 Node* zmem = zero_memory(); // initially zero memory state | |
| 3630 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
| 3631 Node* st = in(i); | |
| 3632 intptr_t st_off = get_store_offset(st, phase); | |
| 3633 | |
| 3634 // Figure out the store's offset and constant value: | |
| 3635 if (st_off < header_size) continue; //skip (ignore header) | |
| 3636 if (st->in(MemNode::Memory) != zmem) continue; //skip (odd store chain) | |
| 3637 int st_size = st->as_Store()->memory_size(); | |
| 3638 if (st_off + st_size > size_limit) break; | |
| 3639 | |
| 3640 // Record which bytes are touched, whether by constant or not. | |
| 3641 if (!store_constant(inits, num_tiles, st_off, st_size, (jlong) -1)) | |
| 3642 continue; // skip (strange store size) | |
| 3643 | |
| 3644 const Type* val = phase->type(st->in(MemNode::ValueIn)); | |
| 3645 if (!val->singleton()) continue; //skip (non-con store) | |
| 3646 BasicType type = val->basic_type(); | |
| 3647 | |
| 3648 jlong con = 0; | |
| 3649 switch (type) { | |
| 3650 case T_INT: con = val->is_int()->get_con(); break; | |
| 3651 case T_LONG: con = val->is_long()->get_con(); break; | |
| 3652 case T_FLOAT: con = jint_cast(val->getf()); break; | |
| 3653 case T_DOUBLE: con = jlong_cast(val->getd()); break; | |
| 3654 default: continue; //skip (odd store type) | |
| 3655 } | |
| 3656 | |
| 3657 if (type == T_LONG && Matcher::isSimpleConstant64(con) && | |
| 3658 st->Opcode() == Op_StoreL) { | |
| 3659 continue; // This StoreL is already optimal. | |
| 3660 } | |
| 3661 | |
| 3662 // Store down the constant. | |
| 3663 store_constant(tiles, num_tiles, st_off, st_size, con); | |
| 3664 | |
| 3665 intptr_t j = st_off >> LogBytesPerLong; | |
| 3666 | |
| 3667 if (type == T_INT && st_size == BytesPerInt | |
| 3668 && (st_off & BytesPerInt) == BytesPerInt) { | |
| 3669 jlong lcon = tiles[j]; | |
| 3670 if (!Matcher::isSimpleConstant64(lcon) && | |
| 3671 st->Opcode() == Op_StoreI) { | |
| 3672 // This StoreI is already optimal by itself. | |
| 3673 jint* intcon = (jint*) &tiles[j]; | |
| 3674 intcon[1] = 0; // undo the store_constant() | |
| 3675 | |
| 3676 // If the previous store is also optimal by itself, back up and | |
| 3677 // undo the action of the previous loop iteration... if we can. | |
| 3678 // But if we can't, just let the previous half take care of itself. | |
| 3679 st = nodes[j]; | |
| 3680 st_off -= BytesPerInt; | |
| 3681 con = intcon[0]; | |
| 3682 if (con != 0 && st != NULL && st->Opcode() == Op_StoreI) { | |
| 3683 assert(st_off >= header_size, "still ignoring header"); | |
| 3684 assert(get_store_offset(st, phase) == st_off, "must be"); | |
| 3685 assert(in(i-1) == zmem, "must be"); | |
| 3686 DEBUG_ONLY(const Type* tcon = phase->type(st->in(MemNode::ValueIn))); | |
| 3687 assert(con == tcon->is_int()->get_con(), "must be"); | |
| 3688 // Undo the effects of the previous loop trip, which swallowed st: | |
| 3689 intcon[0] = 0; // undo store_constant() | |
| 3690 set_req(i-1, st); // undo set_req(i, zmem) | |
| 3691 nodes[j] = NULL; // undo nodes[j] = st | |
| 3692 --old_subword; // undo ++old_subword | |
| 3693 } | |
| 3694 continue; // This StoreI is already optimal. | |
| 3695 } | |
| 3696 } | |
| 3697 | |
| 3698 // This store is not needed. | |
| 3699 set_req(i, zmem); | |
| 3700 nodes[j] = st; // record for the moment | |
| 3701 if (st_size < BytesPerLong) // something has changed | |
| 3702 ++old_subword; // includes int/float, but who's counting... | |
| 3703 else ++old_long; | |
| 3704 } | |
| 3705 | |
| 3706 if ((old_subword + old_long) == 0) | |
| 3707 return; // nothing more to do | |
| 3708 | |
| 3709 //// Pass B: Convert any non-zero tiles into optimal constant stores. | |
| 3710 // Be sure to insert them before overlapping non-constant stores. | |
| 3711 // (E.g., byte[] x = { 1,2,y,4 } => x[int 0] = 0x01020004, x[2]=y.) | |
| 3712 for (int j = 0; j < num_tiles; j++) { | |
| 3713 jlong con = tiles[j]; | |
| 3714 jlong init = inits[j]; | |
| 3715 if (con == 0) continue; | |
| 3716 jint con0, con1; // split the constant, address-wise | |
| 3717 jint init0, init1; // split the init map, address-wise | |
| 3718 { union { jlong con; jint intcon[2]; } u; | |
| 3719 u.con = con; | |
| 3720 con0 = u.intcon[0]; | |
| 3721 con1 = u.intcon[1]; | |
| 3722 u.con = init; | |
| 3723 init0 = u.intcon[0]; | |
| 3724 init1 = u.intcon[1]; | |
| 3725 } | |
| 3726 | |
| 3727 Node* old = nodes[j]; | |
| 3728 assert(old != NULL, "need the prior store"); | |
| 3729 intptr_t offset = (j * BytesPerLong); | |
| 3730 | |
| 3731 bool split = !Matcher::isSimpleConstant64(con); | |
| 3732 | |
| 3733 if (offset < header_size) { | |
| 3734 assert(offset + BytesPerInt >= header_size, "second int counts"); | |
| 3735 assert(*(jint*)&tiles[j] == 0, "junk in header"); | |
| 3736 split = true; // only the second word counts | |
| 3737 // Example: int a[] = { 42 ... } | |
| 3738 } else if (con0 == 0 && init0 == -1) { | |
| 3739 split = true; // first word is covered by full inits | |
| 3740 // Example: int a[] = { ... foo(), 42 ... } | |
| 3741 } else if (con1 == 0 && init1 == -1) { | |
| 3742 split = true; // second word is covered by full inits | |
| 3743 // Example: int a[] = { ... 42, foo() ... } | |
| 3744 } | |
| 3745 | |
| 3746 // Here's a case where init0 is neither 0 nor -1: | |
| 3747 // byte a[] = { ... 0,0,foo(),0, 0,0,0,42 ... } | |
| 3748 // Assuming big-endian memory, init0, init1 are 0x0000FF00, 0x000000FF. | |
| 3749 // In this case the tile is not split; it is (jlong)42. | |
| 3750 // The big tile is stored down, and then the foo() value is inserted. | |
| 3751 // (If there were foo(),foo() instead of foo(),0, init0 would be -1.) | |
| 3752 | |
| 3753 Node* ctl = old->in(MemNode::Control); | |
| 3754 Node* adr = make_raw_address(offset, phase); | |
| 3755 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
| 3756 | |
| 3757 // One or two coalesced stores to plop down. | |
| 3758 Node* st[2]; | |
| 3759 intptr_t off[2]; | |
| 3760 int nst = 0; | |
| 3761 if (!split) { | |
| 3762 ++new_long; | |
| 3763 off[nst] = offset; | |
|
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3764 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
| 0 | 3765 phase->longcon(con), T_LONG); |
| 3766 } else { | |
| 3767 // Omit either if it is a zero. | |
| 3768 if (con0 != 0) { | |
| 3769 ++new_int; | |
| 3770 off[nst] = offset; | |
|
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3771 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
| 0 | 3772 phase->intcon(con0), T_INT); |
| 3773 } | |
| 3774 if (con1 != 0) { | |
| 3775 ++new_int; | |
| 3776 offset += BytesPerInt; | |
| 3777 adr = make_raw_address(offset, phase); | |
| 3778 off[nst] = offset; | |
|
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3779 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
| 0 | 3780 phase->intcon(con1), T_INT); |
| 3781 } | |
| 3782 } | |
| 3783 | |
| 3784 // Insert second store first, then the first before the second. | |
| 3785 // Insert each one just before any overlapping non-constant stores. | |
| 3786 while (nst > 0) { | |
| 3787 Node* st1 = st[--nst]; | |
| 3788 C->copy_node_notes_to(st1, old); | |
| 3789 st1 = phase->transform(st1); | |
| 3790 offset = off[nst]; | |
| 3791 assert(offset >= header_size, "do not smash header"); | |
| 3792 int ins_idx = captured_store_insertion_point(offset, /*size:*/0, phase); | |
| 3793 guarantee(ins_idx != 0, "must re-insert constant store"); | |
| 3794 if (ins_idx < 0) ins_idx = -ins_idx; // never overlap | |
| 3795 if (ins_idx > InitializeNode::RawStores && in(ins_idx-1) == zmem) | |
| 3796 set_req(--ins_idx, st1); | |
| 3797 else | |
| 3798 ins_req(ins_idx, st1); | |
| 3799 } | |
| 3800 } | |
| 3801 | |
| 3802 if (PrintCompilation && WizardMode) | |
| 3803 tty->print_cr("Changed %d/%d subword/long constants into %d/%d int/long", | |
| 3804 old_subword, old_long, new_int, new_long); | |
| 3805 if (C->log() != NULL) | |
| 3806 C->log()->elem("comment that='%d/%d subword/long to %d/%d int/long'", | |
| 3807 old_subword, old_long, new_int, new_long); | |
| 3808 | |
| 3809 // Clean up any remaining occurrences of zmem: | |
| 3810 remove_extra_zeroes(); | |
| 3811 } | |
| 3812 | |
| 3813 // Explore forward from in(start) to find the first fully initialized | |
| 3814 // word, and return its offset. Skip groups of subword stores which | |
| 3815 // together initialize full words. If in(start) is itself part of a | |
| 3816 // fully initialized word, return the offset of in(start). If there | |
| 3817 // are no following full-word stores, or if something is fishy, return | |
| 3818 // a negative value. | |
| 3819 intptr_t InitializeNode::find_next_fullword_store(uint start, PhaseGVN* phase) { | |
| 3820 int int_map = 0; | |
| 3821 intptr_t int_map_off = 0; | |
| 3822 const int FULL_MAP = right_n_bits(BytesPerInt); // the int_map we hope for | |
| 3823 | |
| 3824 for (uint i = start, limit = req(); i < limit; i++) { | |
| 3825 Node* st = in(i); | |
| 3826 | |
| 3827 intptr_t st_off = get_store_offset(st, phase); | |
| 3828 if (st_off < 0) break; // return conservative answer | |
| 3829 | |
| 3830 int st_size = st->as_Store()->memory_size(); | |
| 3831 if (st_size >= BytesPerInt && (st_off % BytesPerInt) == 0) { | |
| 3832 return st_off; // we found a complete word init | |
| 3833 } | |
| 3834 | |
| 3835 // update the map: | |
| 3836 | |
| 3837 intptr_t this_int_off = align_size_down(st_off, BytesPerInt); | |
| 3838 if (this_int_off != int_map_off) { | |
| 3839 // reset the map: | |
| 3840 int_map = 0; | |
| 3841 int_map_off = this_int_off; | |
| 3842 } | |
| 3843 | |
| 3844 int subword_off = st_off - this_int_off; | |
| 3845 int_map |= right_n_bits(st_size) << subword_off; | |
| 3846 if ((int_map & FULL_MAP) == FULL_MAP) { | |
| 3847 return this_int_off; // we found a complete word init | |
| 3848 } | |
| 3849 | |
| 3850 // Did this store hit or cross the word boundary? | |
| 3851 intptr_t next_int_off = align_size_down(st_off + st_size, BytesPerInt); | |
| 3852 if (next_int_off == this_int_off + BytesPerInt) { | |
| 3853 // We passed the current int, without fully initializing it. | |
| 3854 int_map_off = next_int_off; | |
| 3855 int_map >>= BytesPerInt; | |
| 3856 } else if (next_int_off > this_int_off + BytesPerInt) { | |
| 3857 // We passed the current and next int. | |
| 3858 return this_int_off + BytesPerInt; | |
| 3859 } | |
| 3860 } | |
| 3861 | |
| 3862 return -1; | |
| 3863 } | |
| 3864 | |
| 3865 | |
| 3866 // Called when the associated AllocateNode is expanded into CFG. | |
| 3867 // At this point, we may perform additional optimizations. | |
| 3868 // Linearize the stores by ascending offset, to make memory | |
| 3869 // activity as coherent as possible. | |
| 3870 Node* InitializeNode::complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
| 3871 intptr_t header_size, | |
| 3872 Node* size_in_bytes, | |
| 3873 PhaseGVN* phase) { | |
| 3874 assert(!is_complete(), "not already complete"); | |
| 3875 assert(stores_are_sane(phase), ""); | |
| 3876 assert(allocation() != NULL, "must be present"); | |
| 3877 | |
| 3878 remove_extra_zeroes(); | |
| 3879 | |
| 3880 if (ReduceFieldZeroing || ReduceBulkZeroing) | |
| 3881 // reduce instruction count for common initialization patterns | |
| 3882 coalesce_subword_stores(header_size, size_in_bytes, phase); | |
| 3883 | |
| 3884 Node* zmem = zero_memory(); // initially zero memory state | |
| 3885 Node* inits = zmem; // accumulating a linearized chain of inits | |
| 3886 #ifdef ASSERT | |
|
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3887 intptr_t first_offset = allocation()->minimum_header_size(); |
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3888 intptr_t last_init_off = first_offset; // previous init offset |
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3889 intptr_t last_init_end = first_offset; // previous init offset+size |
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3890 intptr_t last_tile_end = first_offset; // previous tile offset+size |
| 0 | 3891 #endif |
| 3892 intptr_t zeroes_done = header_size; | |
| 3893 | |
| 3894 bool do_zeroing = true; // we might give up if inits are very sparse | |
| 3895 int big_init_gaps = 0; // how many large gaps have we seen? | |
| 3896 | |
| 3897 if (ZeroTLAB) do_zeroing = false; | |
| 3898 if (!ReduceFieldZeroing && !ReduceBulkZeroing) do_zeroing = false; | |
| 3899 | |
| 3900 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
| 3901 Node* st = in(i); | |
| 3902 intptr_t st_off = get_store_offset(st, phase); | |
| 3903 if (st_off < 0) | |
| 3904 break; // unknown junk in the inits | |
| 3905 if (st->in(MemNode::Memory) != zmem) | |
| 3906 break; // complicated store chains somehow in list | |
| 3907 | |
| 3908 int st_size = st->as_Store()->memory_size(); | |
| 3909 intptr_t next_init_off = st_off + st_size; | |
| 3910 | |
| 3911 if (do_zeroing && zeroes_done < next_init_off) { | |
| 3912 // See if this store needs a zero before it or under it. | |
| 3913 intptr_t zeroes_needed = st_off; | |
| 3914 | |
| 3915 if (st_size < BytesPerInt) { | |
| 3916 // Look for subword stores which only partially initialize words. | |
| 3917 // If we find some, we must lay down some word-level zeroes first, | |
| 3918 // underneath the subword stores. | |
| 3919 // | |
| 3920 // Examples: | |
| 3921 // byte[] a = { p,q,r,s } => a[0]=p,a[1]=q,a[2]=r,a[3]=s | |
| 3922 // byte[] a = { x,y,0,0 } => a[0..3] = 0, a[0]=x,a[1]=y | |
| 3923 // byte[] a = { 0,0,z,0 } => a[0..3] = 0, a[2]=z | |
| 3924 // | |
| 3925 // Note: coalesce_subword_stores may have already done this, | |
| 3926 // if it was prompted by constant non-zero subword initializers. | |
| 3927 // But this case can still arise with non-constant stores. | |
| 3928 | |
| 3929 intptr_t next_full_store = find_next_fullword_store(i, phase); | |
| 3930 | |
| 3931 // In the examples above: | |
| 3932 // in(i) p q r s x y z | |
| 3933 // st_off 12 13 14 15 12 13 14 | |
| 3934 // st_size 1 1 1 1 1 1 1 | |
| 3935 // next_full_s. 12 16 16 16 16 16 16 | |
| 3936 // z's_done 12 16 16 16 12 16 12 | |
| 3937 // z's_needed 12 16 16 16 16 16 16 | |
| 3938 // zsize 0 0 0 0 4 0 4 | |
| 3939 if (next_full_store < 0) { | |
| 3940 // Conservative tack: Zero to end of current word. | |
| 3941 zeroes_needed = align_size_up(zeroes_needed, BytesPerInt); | |
| 3942 } else { | |
| 3943 // Zero to beginning of next fully initialized word. | |
| 3944 // Or, don't zero at all, if we are already in that word. | |
| 3945 assert(next_full_store >= zeroes_needed, "must go forward"); | |
| 3946 assert((next_full_store & (BytesPerInt-1)) == 0, "even boundary"); | |
| 3947 zeroes_needed = next_full_store; | |
| 3948 } | |
| 3949 } | |
| 3950 | |
| 3951 if (zeroes_needed > zeroes_done) { | |
| 3952 intptr_t zsize = zeroes_needed - zeroes_done; | |
| 3953 // Do some incremental zeroing on rawmem, in parallel with inits. | |
| 3954 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
| 3955 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
| 3956 zeroes_done, zeroes_needed, | |
| 3957 phase); | |
| 3958 zeroes_done = zeroes_needed; | |
| 3959 if (zsize > Matcher::init_array_short_size && ++big_init_gaps > 2) | |
| 3960 do_zeroing = false; // leave the hole, next time | |
| 3961 } | |
| 3962 } | |
| 3963 | |
| 3964 // Collect the store and move on: | |
| 3965 st->set_req(MemNode::Memory, inits); | |
| 3966 inits = st; // put it on the linearized chain | |
| 3967 set_req(i, zmem); // unhook from previous position | |
| 3968 | |
| 3969 if (zeroes_done == st_off) | |
| 3970 zeroes_done = next_init_off; | |
| 3971 | |
| 3972 assert(!do_zeroing || zeroes_done >= next_init_off, "don't miss any"); | |
| 3973 | |
| 3974 #ifdef ASSERT | |
| 3975 // Various order invariants. Weaker than stores_are_sane because | |
| 3976 // a large constant tile can be filled in by smaller non-constant stores. | |
| 3977 assert(st_off >= last_init_off, "inits do not reverse"); | |
| 3978 last_init_off = st_off; | |
| 3979 const Type* val = NULL; | |
| 3980 if (st_size >= BytesPerInt && | |
| 3981 (val = phase->type(st->in(MemNode::ValueIn)))->singleton() && | |
| 3982 (int)val->basic_type() < (int)T_OBJECT) { | |
| 3983 assert(st_off >= last_tile_end, "tiles do not overlap"); | |
| 3984 assert(st_off >= last_init_end, "tiles do not overwrite inits"); | |
| 3985 last_tile_end = MAX2(last_tile_end, next_init_off); | |
| 3986 } else { | |
| 3987 intptr_t st_tile_end = align_size_up(next_init_off, BytesPerLong); | |
| 3988 assert(st_tile_end >= last_tile_end, "inits stay with tiles"); | |
| 3989 assert(st_off >= last_init_end, "inits do not overlap"); | |
| 3990 last_init_end = next_init_off; // it's a non-tile | |
| 3991 } | |
| 3992 #endif //ASSERT | |
| 3993 } | |
| 3994 | |
| 3995 remove_extra_zeroes(); // clear out all the zmems left over | |
| 3996 add_req(inits); | |
| 3997 | |
| 3998 if (!ZeroTLAB) { | |
| 3999 // If anything remains to be zeroed, zero it all now. | |
| 4000 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
| 4001 // if it is the last unused 4 bytes of an instance, forget about it | |
| 4002 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint); | |
| 4003 if (zeroes_done + BytesPerLong >= size_limit) { | |
| 4004 assert(allocation() != NULL, ""); | |
|
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4005 if (allocation()->Opcode() == Op_Allocate) { |
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4006 Node* klass_node = allocation()->in(AllocateNode::KlassNode); |
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4007 ciKlass* k = phase->type(klass_node)->is_klassptr()->klass(); |
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4008 if (zeroes_done == k->layout_helper()) |
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4009 zeroes_done = size_limit; |
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4010 } |
| 0 | 4011 } |
| 4012 if (zeroes_done < size_limit) { | |
| 4013 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
| 4014 zeroes_done, size_in_bytes, phase); | |
| 4015 } | |
| 4016 } | |
| 4017 | |
| 4018 set_complete(phase); | |
| 4019 return rawmem; | |
| 4020 } | |
| 4021 | |
| 4022 | |
| 4023 #ifdef ASSERT | |
| 4024 bool InitializeNode::stores_are_sane(PhaseTransform* phase) { | |
| 4025 if (is_complete()) | |
| 4026 return true; // stores could be anything at this point | |
|
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4027 assert(allocation() != NULL, "must be present"); |
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4028 intptr_t last_off = allocation()->minimum_header_size(); |
| 0 | 4029 for (uint i = InitializeNode::RawStores; i < req(); i++) { |
| 4030 Node* st = in(i); | |
| 4031 intptr_t st_off = get_store_offset(st, phase); | |
| 4032 if (st_off < 0) continue; // ignore dead garbage | |
| 4033 if (last_off > st_off) { | |
| 4034 tty->print_cr("*** bad store offset at %d: %d > %d", i, last_off, st_off); | |
| 4035 this->dump(2); | |
| 4036 assert(false, "ascending store offsets"); | |
| 4037 return false; | |
| 4038 } | |
| 4039 last_off = st_off + st->as_Store()->memory_size(); | |
| 4040 } | |
| 4041 return true; | |
| 4042 } | |
| 4043 #endif //ASSERT | |
| 4044 | |
| 4045 | |
| 4046 | |
| 4047 | |
| 4048 //============================MergeMemNode===================================== | |
| 4049 // | |
| 4050 // SEMANTICS OF MEMORY MERGES: A MergeMem is a memory state assembled from several | |
| 4051 // contributing store or call operations. Each contributor provides the memory | |
| 4052 // state for a particular "alias type" (see Compile::alias_type). For example, | |
| 4053 // if a MergeMem has an input X for alias category #6, then any memory reference | |
| 4054 // to alias category #6 may use X as its memory state input, as an exact equivalent | |
| 4055 // to using the MergeMem as a whole. | |
| 4056 // Load<6>( MergeMem(<6>: X, ...), p ) <==> Load<6>(X,p) | |
| 4057 // | |
| 4058 // (Here, the <N> notation gives the index of the relevant adr_type.) | |
| 4059 // | |
| 4060 // In one special case (and more cases in the future), alias categories overlap. | |
| 4061 // The special alias category "Bot" (Compile::AliasIdxBot) includes all memory | |
| 4062 // states. Therefore, if a MergeMem has only one contributing input W for Bot, | |
| 4063 // it is exactly equivalent to that state W: | |
| 4064 // MergeMem(<Bot>: W) <==> W | |
| 4065 // | |
| 4066 // Usually, the merge has more than one input. In that case, where inputs | |
| 4067 // overlap (i.e., one is Bot), the narrower alias type determines the memory | |
| 4068 // state for that type, and the wider alias type (Bot) fills in everywhere else: | |
| 4069 // Load<5>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<5>(W,p) | |
| 4070 // Load<6>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<6>(X,p) | |
| 4071 // | |
| 4072 // A merge can take a "wide" memory state as one of its narrow inputs. | |
| 4073 // This simply means that the merge observes out only the relevant parts of | |
| 4074 // the wide input. That is, wide memory states arriving at narrow merge inputs | |
| 4075 // are implicitly "filtered" or "sliced" as necessary. (This is rare.) | |
| 4076 // | |
| 4077 // These rules imply that MergeMem nodes may cascade (via their <Bot> links), | |
| 4078 // and that memory slices "leak through": | |
| 4079 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y)) <==> MergeMem(<Bot>: W, <7>: Y) | |
| 4080 // | |
| 4081 // But, in such a cascade, repeated memory slices can "block the leak": | |
| 4082 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y), <7>: Y') <==> MergeMem(<Bot>: W, <7>: Y') | |
| 4083 // | |
| 4084 // In the last example, Y is not part of the combined memory state of the | |
| 4085 // outermost MergeMem. The system must, of course, prevent unschedulable | |
| 4086 // memory states from arising, so you can be sure that the state Y is somehow | |
| 4087 // a precursor to state Y'. | |
| 4088 // | |
| 4089 // | |
| 4090 // REPRESENTATION OF MEMORY MERGES: The indexes used to address the Node::in array | |
| 4091 // of each MergeMemNode array are exactly the numerical alias indexes, including | |
| 4092 // but not limited to AliasIdxTop, AliasIdxBot, and AliasIdxRaw. The functions | |
| 4093 // Compile::alias_type (and kin) produce and manage these indexes. | |
| 4094 // | |
| 4095 // By convention, the value of in(AliasIdxTop) (i.e., in(1)) is always the top node. | |
| 4096 // (Note that this provides quick access to the top node inside MergeMem methods, | |
| 4097 // without the need to reach out via TLS to Compile::current.) | |
| 4098 // | |
| 4099 // As a consequence of what was just described, a MergeMem that represents a full | |
| 4100 // memory state has an edge in(AliasIdxBot) which is a "wide" memory state, | |
| 4101 // containing all alias categories. | |
| 4102 // | |
| 4103 // MergeMem nodes never (?) have control inputs, so in(0) is NULL. | |
| 4104 // | |
| 4105 // All other edges in(N) (including in(AliasIdxRaw), which is in(3)) are either | |
| 4106 // a memory state for the alias type <N>, or else the top node, meaning that | |
| 4107 // there is no particular input for that alias type. Note that the length of | |
| 4108 // a MergeMem is variable, and may be extended at any time to accommodate new | |
| 4109 // memory states at larger alias indexes. When merges grow, they are of course | |
| 4110 // filled with "top" in the unused in() positions. | |
| 4111 // | |
| 4112 // This use of top is named "empty_memory()", or "empty_mem" (no-memory) as a variable. | |
| 4113 // (Top was chosen because it works smoothly with passes like GCM.) | |
| 4114 // | |
| 4115 // For convenience, we hardwire the alias index for TypeRawPtr::BOTTOM. (It is | |
| 4116 // the type of random VM bits like TLS references.) Since it is always the | |
| 4117 // first non-Bot memory slice, some low-level loops use it to initialize an | |
| 4118 // index variable: for (i = AliasIdxRaw; i < req(); i++). | |
| 4119 // | |
| 4120 // | |
| 4121 // ACCESSORS: There is a special accessor MergeMemNode::base_memory which returns | |
| 4122 // the distinguished "wide" state. The accessor MergeMemNode::memory_at(N) returns | |
| 4123 // the memory state for alias type <N>, or (if there is no particular slice at <N>, | |
| 4124 // it returns the base memory. To prevent bugs, memory_at does not accept <Top> | |
| 4125 // or <Bot> indexes. The iterator MergeMemStream provides robust iteration over | |
| 4126 // MergeMem nodes or pairs of such nodes, ensuring that the non-top edges are visited. | |
| 4127 // | |
| 4128 // %%%% We may get rid of base_memory as a separate accessor at some point; it isn't | |
| 4129 // really that different from the other memory inputs. An abbreviation called | |
| 4130 // "bot_memory()" for "memory_at(AliasIdxBot)" would keep code tidy. | |
| 4131 // | |
| 4132 // | |
| 4133 // PARTIAL MEMORY STATES: During optimization, MergeMem nodes may arise that represent | |
| 4134 // partial memory states. When a Phi splits through a MergeMem, the copy of the Phi | |
| 4135 // that "emerges though" the base memory will be marked as excluding the alias types | |
| 4136 // of the other (narrow-memory) copies which "emerged through" the narrow edges: | |
| 4137 // | |
| 4138 // Phi<Bot>(U, MergeMem(<Bot>: W, <8>: Y)) | |
| 4139 // ==Ideal=> MergeMem(<Bot>: Phi<Bot-8>(U, W), Phi<8>(U, Y)) | |
| 4140 // | |
| 4141 // This strange "subtraction" effect is necessary to ensure IGVN convergence. | |
| 4142 // (It is currently unimplemented.) As you can see, the resulting merge is | |
| 4143 // actually a disjoint union of memory states, rather than an overlay. | |
| 4144 // | |
| 4145 | |
| 4146 //------------------------------MergeMemNode----------------------------------- | |
| 4147 Node* MergeMemNode::make_empty_memory() { | |
| 4148 Node* empty_memory = (Node*) Compile::current()->top(); | |
| 4149 assert(empty_memory->is_top(), "correct sentinel identity"); | |
| 4150 return empty_memory; | |
| 4151 } | |
| 4152 | |
| 4153 MergeMemNode::MergeMemNode(Node *new_base) : Node(1+Compile::AliasIdxRaw) { | |
| 4154 init_class_id(Class_MergeMem); | |
| 4155 // all inputs are nullified in Node::Node(int) | |
| 4156 // set_input(0, NULL); // no control input | |
| 4157 | |
| 4158 // Initialize the edges uniformly to top, for starters. | |
| 4159 Node* empty_mem = make_empty_memory(); | |
| 4160 for (uint i = Compile::AliasIdxTop; i < req(); i++) { | |
| 4161 init_req(i,empty_mem); | |
| 4162 } | |
| 4163 assert(empty_memory() == empty_mem, ""); | |
| 4164 | |
| 4165 if( new_base != NULL && new_base->is_MergeMem() ) { | |
| 4166 MergeMemNode* mdef = new_base->as_MergeMem(); | |
| 4167 assert(mdef->empty_memory() == empty_mem, "consistent sentinels"); | |
| 4168 for (MergeMemStream mms(this, mdef); mms.next_non_empty2(); ) { | |
| 4169 mms.set_memory(mms.memory2()); | |
| 4170 } | |
| 4171 assert(base_memory() == mdef->base_memory(), ""); | |
| 4172 } else { | |
| 4173 set_base_memory(new_base); | |
| 4174 } | |
| 4175 } | |
| 4176 | |
| 4177 // Make a new, untransformed MergeMem with the same base as 'mem'. | |
| 4178 // If mem is itself a MergeMem, populate the result with the same edges. | |
| 4179 MergeMemNode* MergeMemNode::make(Compile* C, Node* mem) { | |
|
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e626685e9f6c
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6795
diff
changeset
|
4180 return new(C) MergeMemNode(mem); |
| 0 | 4181 } |
| 4182 | |
| 4183 //------------------------------cmp-------------------------------------------- | |
| 4184 uint MergeMemNode::hash() const { return NO_HASH; } | |
| 4185 uint MergeMemNode::cmp( const Node &n ) const { | |
| 4186 return (&n == this); // Always fail except on self | |
| 4187 } | |
| 4188 | |
| 4189 //------------------------------Identity--------------------------------------- | |
| 4190 Node* MergeMemNode::Identity(PhaseTransform *phase) { | |
| 4191 // Identity if this merge point does not record any interesting memory | |
| 4192 // disambiguations. | |
| 4193 Node* base_mem = base_memory(); | |
| 4194 Node* empty_mem = empty_memory(); | |
| 4195 if (base_mem != empty_mem) { // Memory path is not dead? | |
| 4196 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 4197 Node* mem = in(i); | |
| 4198 if (mem != empty_mem && mem != base_mem) { | |
| 4199 return this; // Many memory splits; no change | |
| 4200 } | |
| 4201 } | |
| 4202 } | |
| 4203 return base_mem; // No memory splits; ID on the one true input | |
| 4204 } | |
| 4205 | |
| 4206 //------------------------------Ideal------------------------------------------ | |
| 4207 // This method is invoked recursively on chains of MergeMem nodes | |
| 4208 Node *MergeMemNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 4209 // Remove chain'd MergeMems | |
| 4210 // | |
| 4211 // This is delicate, because the each "in(i)" (i >= Raw) is interpreted | |
| 4212 // relative to the "in(Bot)". Since we are patching both at the same time, | |
| 4213 // we have to be careful to read each "in(i)" relative to the old "in(Bot)", | |
| 4214 // but rewrite each "in(i)" relative to the new "in(Bot)". | |
| 4215 Node *progress = NULL; | |
| 4216 | |
| 4217 | |
| 4218 Node* old_base = base_memory(); | |
| 4219 Node* empty_mem = empty_memory(); | |
| 4220 if (old_base == empty_mem) | |
| 4221 return NULL; // Dead memory path. | |
| 4222 | |
| 4223 MergeMemNode* old_mbase; | |
| 4224 if (old_base != NULL && old_base->is_MergeMem()) | |
| 4225 old_mbase = old_base->as_MergeMem(); | |
| 4226 else | |
| 4227 old_mbase = NULL; | |
| 4228 Node* new_base = old_base; | |
| 4229 | |
| 4230 // simplify stacked MergeMems in base memory | |
| 4231 if (old_mbase) new_base = old_mbase->base_memory(); | |
| 4232 | |
| 4233 // the base memory might contribute new slices beyond my req() | |
| 4234 if (old_mbase) grow_to_match(old_mbase); | |
| 4235 | |
| 4236 // Look carefully at the base node if it is a phi. | |
| 4237 PhiNode* phi_base; | |
| 4238 if (new_base != NULL && new_base->is_Phi()) | |
| 4239 phi_base = new_base->as_Phi(); | |
| 4240 else | |
| 4241 phi_base = NULL; | |
| 4242 | |
| 4243 Node* phi_reg = NULL; | |
| 4244 uint phi_len = (uint)-1; | |
| 4245 if (phi_base != NULL && !phi_base->is_copy()) { | |
| 4246 // do not examine phi if degraded to a copy | |
| 4247 phi_reg = phi_base->region(); | |
| 4248 phi_len = phi_base->req(); | |
| 4249 // see if the phi is unfinished | |
| 4250 for (uint i = 1; i < phi_len; i++) { | |
| 4251 if (phi_base->in(i) == NULL) { | |
| 4252 // incomplete phi; do not look at it yet! | |
| 4253 phi_reg = NULL; | |
| 4254 phi_len = (uint)-1; | |
| 4255 break; | |
| 4256 } | |
| 4257 } | |
| 4258 } | |
| 4259 | |
| 4260 // Note: We do not call verify_sparse on entry, because inputs | |
| 4261 // can normalize to the base_memory via subsume_node or similar | |
| 4262 // mechanisms. This method repairs that damage. | |
| 4263 | |
| 4264 assert(!old_mbase || old_mbase->is_empty_memory(empty_mem), "consistent sentinels"); | |
| 4265 | |
| 4266 // Look at each slice. | |
| 4267 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 4268 Node* old_in = in(i); | |
| 4269 // calculate the old memory value | |
| 4270 Node* old_mem = old_in; | |
| 4271 if (old_mem == empty_mem) old_mem = old_base; | |
| 4272 assert(old_mem == memory_at(i), ""); | |
| 4273 | |
| 4274 // maybe update (reslice) the old memory value | |
| 4275 | |
| 4276 // simplify stacked MergeMems | |
| 4277 Node* new_mem = old_mem; | |
| 4278 MergeMemNode* old_mmem; | |
| 4279 if (old_mem != NULL && old_mem->is_MergeMem()) | |
| 4280 old_mmem = old_mem->as_MergeMem(); | |
| 4281 else | |
| 4282 old_mmem = NULL; | |
| 4283 if (old_mmem == this) { | |
| 4284 // This can happen if loops break up and safepoints disappear. | |
| 4285 // A merge of BotPtr (default) with a RawPtr memory derived from a | |
| 4286 // safepoint can be rewritten to a merge of the same BotPtr with | |
| 4287 // the BotPtr phi coming into the loop. If that phi disappears | |
| 4288 // also, we can end up with a self-loop of the mergemem. | |
| 4289 // In general, if loops degenerate and memory effects disappear, | |
| 4290 // a mergemem can be left looking at itself. This simply means | |
| 4291 // that the mergemem's default should be used, since there is | |
| 4292 // no longer any apparent effect on this slice. | |
| 4293 // Note: If a memory slice is a MergeMem cycle, it is unreachable | |
| 4294 // from start. Update the input to TOP. | |
| 4295 new_mem = (new_base == this || new_base == empty_mem)? empty_mem : new_base; | |
| 4296 } | |
| 4297 else if (old_mmem != NULL) { | |
| 4298 new_mem = old_mmem->memory_at(i); | |
| 4299 } | |
| 605 | 4300 // else preceding memory was not a MergeMem |
| 0 | 4301 |
| 4302 // replace equivalent phis (unfortunately, they do not GVN together) | |
| 4303 if (new_mem != NULL && new_mem != new_base && | |
| 4304 new_mem->req() == phi_len && new_mem->in(0) == phi_reg) { | |
| 4305 if (new_mem->is_Phi()) { | |
| 4306 PhiNode* phi_mem = new_mem->as_Phi(); | |
| 4307 for (uint i = 1; i < phi_len; i++) { | |
| 4308 if (phi_base->in(i) != phi_mem->in(i)) { | |
| 4309 phi_mem = NULL; | |
| 4310 break; | |
| 4311 } | |
| 4312 } | |
| 4313 if (phi_mem != NULL) { | |
| 4314 // equivalent phi nodes; revert to the def | |
| 4315 new_mem = new_base; | |
| 4316 } | |
| 4317 } | |
| 4318 } | |
| 4319 | |
| 4320 // maybe store down a new value | |
| 4321 Node* new_in = new_mem; | |
| 4322 if (new_in == new_base) new_in = empty_mem; | |
| 4323 | |
| 4324 if (new_in != old_in) { | |
| 4325 // Warning: Do not combine this "if" with the previous "if" | |
| 4326 // A memory slice might have be be rewritten even if it is semantically | |
| 4327 // unchanged, if the base_memory value has changed. | |
| 4328 set_req(i, new_in); | |
| 4329 progress = this; // Report progress | |
| 4330 } | |
| 4331 } | |
| 4332 | |
| 4333 if (new_base != old_base) { | |
| 4334 set_req(Compile::AliasIdxBot, new_base); | |
| 4335 // Don't use set_base_memory(new_base), because we need to update du. | |
| 4336 assert(base_memory() == new_base, ""); | |
| 4337 progress = this; | |
| 4338 } | |
| 4339 | |
| 4340 if( base_memory() == this ) { | |
| 4341 // a self cycle indicates this memory path is dead | |
| 4342 set_req(Compile::AliasIdxBot, empty_mem); | |
| 4343 } | |
| 4344 | |
| 4345 // Resolve external cycles by calling Ideal on a MergeMem base_memory | |
| 4346 // Recursion must occur after the self cycle check above | |
| 4347 if( base_memory()->is_MergeMem() ) { | |
| 4348 MergeMemNode *new_mbase = base_memory()->as_MergeMem(); | |
| 4349 Node *m = phase->transform(new_mbase); // Rollup any cycles | |
| 4350 if( m != NULL && (m->is_top() || | |
| 4351 m->is_MergeMem() && m->as_MergeMem()->base_memory() == empty_mem) ) { | |
| 4352 // propagate rollup of dead cycle to self | |
| 4353 set_req(Compile::AliasIdxBot, empty_mem); | |
| 4354 } | |
| 4355 } | |
| 4356 | |
| 4357 if( base_memory() == empty_mem ) { | |
| 4358 progress = this; | |
| 4359 // Cut inputs during Parse phase only. | |
| 4360 // During Optimize phase a dead MergeMem node will be subsumed by Top. | |
| 4361 if( !can_reshape ) { | |
| 4362 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 4363 if( in(i) != empty_mem ) { set_req(i, empty_mem); } | |
| 4364 } | |
| 4365 } | |
| 4366 } | |
| 4367 | |
| 4368 if( !progress && base_memory()->is_Phi() && can_reshape ) { | |
| 4369 // Check if PhiNode::Ideal's "Split phis through memory merges" | |
| 4370 // transform should be attempted. Look for this->phi->this cycle. | |
| 4371 uint merge_width = req(); | |
| 4372 if (merge_width > Compile::AliasIdxRaw) { | |
| 4373 PhiNode* phi = base_memory()->as_Phi(); | |
| 4374 for( uint i = 1; i < phi->req(); ++i ) {// For all paths in | |
| 4375 if (phi->in(i) == this) { | |
| 4376 phase->is_IterGVN()->_worklist.push(phi); | |
| 4377 break; | |
| 4378 } | |
| 4379 } | |
| 4380 } | |
| 4381 } | |
| 4382 | |
|
64
b8f5ba577b02
6673473: (Escape Analysis) Add the instance's field information to PhiNode
kvn
parents:
43
diff
changeset
|
4383 assert(progress || verify_sparse(), "please, no dups of base"); |
| 0 | 4384 return progress; |
| 4385 } | |
| 4386 | |
| 4387 //-------------------------set_base_memory------------------------------------- | |
| 4388 void MergeMemNode::set_base_memory(Node *new_base) { | |
| 4389 Node* empty_mem = empty_memory(); | |
| 4390 set_req(Compile::AliasIdxBot, new_base); | |
| 4391 assert(memory_at(req()) == new_base, "must set default memory"); | |
| 4392 // Clear out other occurrences of new_base: | |
| 4393 if (new_base != empty_mem) { | |
| 4394 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 4395 if (in(i) == new_base) set_req(i, empty_mem); | |
| 4396 } | |
| 4397 } | |
| 4398 } | |
| 4399 | |
| 4400 //------------------------------out_RegMask------------------------------------ | |
| 4401 const RegMask &MergeMemNode::out_RegMask() const { | |
| 4402 return RegMask::Empty; | |
| 4403 } | |
| 4404 | |
| 4405 //------------------------------dump_spec-------------------------------------- | |
| 4406 #ifndef PRODUCT | |
| 4407 void MergeMemNode::dump_spec(outputStream *st) const { | |
| 4408 st->print(" {"); | |
| 4409 Node* base_mem = base_memory(); | |
| 4410 for( uint i = Compile::AliasIdxRaw; i < req(); i++ ) { | |
| 4411 Node* mem = memory_at(i); | |
| 4412 if (mem == base_mem) { st->print(" -"); continue; } | |
| 4413 st->print( " N%d:", mem->_idx ); | |
| 4414 Compile::current()->get_adr_type(i)->dump_on(st); | |
| 4415 } | |
| 4416 st->print(" }"); | |
| 4417 } | |
| 4418 #endif // !PRODUCT | |
| 4419 | |
| 4420 | |
| 4421 #ifdef ASSERT | |
| 4422 static bool might_be_same(Node* a, Node* b) { | |
| 4423 if (a == b) return true; | |
| 4424 if (!(a->is_Phi() || b->is_Phi())) return false; | |
| 4425 // phis shift around during optimization | |
| 4426 return true; // pretty stupid... | |
| 4427 } | |
| 4428 | |
| 4429 // verify a narrow slice (either incoming or outgoing) | |
| 4430 static void verify_memory_slice(const MergeMemNode* m, int alias_idx, Node* n) { | |
| 4431 if (!VerifyAliases) return; // don't bother to verify unless requested | |
| 4432 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
| 4433 if (Node::in_dump()) return; // muzzle asserts when printing | |
| 4434 assert(alias_idx >= Compile::AliasIdxRaw, "must not disturb base_memory or sentinel"); | |
| 4435 assert(n != NULL, ""); | |
| 4436 // Elide intervening MergeMem's | |
| 4437 while (n->is_MergeMem()) { | |
| 4438 n = n->as_MergeMem()->memory_at(alias_idx); | |
| 4439 } | |
| 4440 Compile* C = Compile::current(); | |
| 4441 const TypePtr* n_adr_type = n->adr_type(); | |
| 4442 if (n == m->empty_memory()) { | |
| 4443 // Implicit copy of base_memory() | |
| 4444 } else if (n_adr_type != TypePtr::BOTTOM) { | |
| 4445 assert(n_adr_type != NULL, "new memory must have a well-defined adr_type"); | |
| 4446 assert(C->must_alias(n_adr_type, alias_idx), "new memory must match selected slice"); | |
| 4447 } else { | |
| 4448 // A few places like make_runtime_call "know" that VM calls are narrow, | |
| 4449 // and can be used to update only the VM bits stored as TypeRawPtr::BOTTOM. | |
| 4450 bool expected_wide_mem = false; | |
| 4451 if (n == m->base_memory()) { | |
| 4452 expected_wide_mem = true; | |
| 4453 } else if (alias_idx == Compile::AliasIdxRaw || | |
| 4454 n == m->memory_at(Compile::AliasIdxRaw)) { | |
| 4455 expected_wide_mem = true; | |
| 4456 } else if (!C->alias_type(alias_idx)->is_rewritable()) { | |
| 4457 // memory can "leak through" calls on channels that | |
| 4458 // are write-once. Allow this also. | |
| 4459 expected_wide_mem = true; | |
| 4460 } | |
| 4461 assert(expected_wide_mem, "expected narrow slice replacement"); | |
| 4462 } | |
| 4463 } | |
| 4464 #else // !ASSERT | |
|
10973
ef57c43512d6
8014431: cleanup warnings indicated by the -Wunused-value compiler option on linux
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parents:
10278
diff
changeset
|
4465 #define verify_memory_slice(m,i,n) (void)(0) // PRODUCT version is no-op |
| 0 | 4466 #endif |
| 4467 | |
| 4468 | |
| 4469 //-----------------------------memory_at--------------------------------------- | |
| 4470 Node* MergeMemNode::memory_at(uint alias_idx) const { | |
| 4471 assert(alias_idx >= Compile::AliasIdxRaw || | |
| 4472 alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, | |
| 4473 "must avoid base_memory and AliasIdxTop"); | |
| 4474 | |
| 4475 // Otherwise, it is a narrow slice. | |
| 4476 Node* n = alias_idx < req() ? in(alias_idx) : empty_memory(); | |
| 4477 Compile *C = Compile::current(); | |
| 4478 if (is_empty_memory(n)) { | |
| 4479 // the array is sparse; empty slots are the "top" node | |
| 4480 n = base_memory(); | |
| 4481 assert(Node::in_dump() | |
| 4482 || n == NULL || n->bottom_type() == Type::TOP | |
|
2317
5a41a201d08c
6812217: Base memory of MergeMem node violates assert during killing expanded AllocateArray node
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parents:
2004
diff
changeset
|
4483 || n->adr_type() == NULL // address is TOP |
| 0 | 4484 || n->adr_type() == TypePtr::BOTTOM |
| 4485 || n->adr_type() == TypeRawPtr::BOTTOM | |
| 4486 || Compile::current()->AliasLevel() == 0, | |
| 4487 "must be a wide memory"); | |
| 4488 // AliasLevel == 0 if we are organizing the memory states manually. | |
| 4489 // See verify_memory_slice for comments on TypeRawPtr::BOTTOM. | |
| 4490 } else { | |
| 4491 // make sure the stored slice is sane | |
| 4492 #ifdef ASSERT | |
| 4493 if (is_error_reported() || Node::in_dump()) { | |
| 4494 } else if (might_be_same(n, base_memory())) { | |
| 4495 // Give it a pass: It is a mostly harmless repetition of the base. | |
| 4496 // This can arise normally from node subsumption during optimization. | |
| 4497 } else { | |
| 4498 verify_memory_slice(this, alias_idx, n); | |
| 4499 } | |
| 4500 #endif | |
| 4501 } | |
| 4502 return n; | |
| 4503 } | |
| 4504 | |
| 4505 //---------------------------set_memory_at------------------------------------- | |
| 4506 void MergeMemNode::set_memory_at(uint alias_idx, Node *n) { | |
| 4507 verify_memory_slice(this, alias_idx, n); | |
| 4508 Node* empty_mem = empty_memory(); | |
| 4509 if (n == base_memory()) n = empty_mem; // collapse default | |
| 4510 uint need_req = alias_idx+1; | |
| 4511 if (req() < need_req) { | |
| 4512 if (n == empty_mem) return; // already the default, so do not grow me | |
| 4513 // grow the sparse array | |
| 4514 do { | |
| 4515 add_req(empty_mem); | |
| 4516 } while (req() < need_req); | |
| 4517 } | |
| 4518 set_req( alias_idx, n ); | |
| 4519 } | |
| 4520 | |
| 4521 | |
| 4522 | |
| 4523 //--------------------------iteration_setup------------------------------------ | |
| 4524 void MergeMemNode::iteration_setup(const MergeMemNode* other) { | |
| 4525 if (other != NULL) { | |
| 4526 grow_to_match(other); | |
| 4527 // invariant: the finite support of mm2 is within mm->req() | |
| 4528 #ifdef ASSERT | |
| 4529 for (uint i = req(); i < other->req(); i++) { | |
| 4530 assert(other->is_empty_memory(other->in(i)), "slice left uncovered"); | |
| 4531 } | |
| 4532 #endif | |
| 4533 } | |
| 4534 // Replace spurious copies of base_memory by top. | |
| 4535 Node* base_mem = base_memory(); | |
| 4536 if (base_mem != NULL && !base_mem->is_top()) { | |
| 4537 for (uint i = Compile::AliasIdxBot+1, imax = req(); i < imax; i++) { | |
| 4538 if (in(i) == base_mem) | |
| 4539 set_req(i, empty_memory()); | |
| 4540 } | |
| 4541 } | |
| 4542 } | |
| 4543 | |
| 4544 //---------------------------grow_to_match------------------------------------- | |
| 4545 void MergeMemNode::grow_to_match(const MergeMemNode* other) { | |
| 4546 Node* empty_mem = empty_memory(); | |
| 4547 assert(other->is_empty_memory(empty_mem), "consistent sentinels"); | |
| 4548 // look for the finite support of the other memory | |
| 4549 for (uint i = other->req(); --i >= req(); ) { | |
| 4550 if (other->in(i) != empty_mem) { | |
| 4551 uint new_len = i+1; | |
| 4552 while (req() < new_len) add_req(empty_mem); | |
| 4553 break; | |
| 4554 } | |
| 4555 } | |
| 4556 } | |
| 4557 | |
| 4558 //---------------------------verify_sparse------------------------------------- | |
| 4559 #ifndef PRODUCT | |
| 4560 bool MergeMemNode::verify_sparse() const { | |
| 4561 assert(is_empty_memory(make_empty_memory()), "sane sentinel"); | |
| 4562 Node* base_mem = base_memory(); | |
| 4563 // The following can happen in degenerate cases, since empty==top. | |
| 4564 if (is_empty_memory(base_mem)) return true; | |
| 4565 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 4566 assert(in(i) != NULL, "sane slice"); | |
| 4567 if (in(i) == base_mem) return false; // should have been the sentinel value! | |
| 4568 } | |
| 4569 return true; | |
| 4570 } | |
| 4571 | |
| 4572 bool MergeMemStream::match_memory(Node* mem, const MergeMemNode* mm, int idx) { | |
| 4573 Node* n; | |
| 4574 n = mm->in(idx); | |
| 4575 if (mem == n) return true; // might be empty_memory() | |
| 4576 n = (idx == Compile::AliasIdxBot)? mm->base_memory(): mm->memory_at(idx); | |
| 4577 if (mem == n) return true; | |
| 4578 while (n->is_Phi() && (n = n->as_Phi()->is_copy()) != NULL) { | |
| 4579 if (mem == n) return true; | |
| 4580 if (n == NULL) break; | |
| 4581 } | |
| 4582 return false; | |
| 4583 } | |
| 4584 #endif // !PRODUCT |