Mercurial > hg > truffle
annotate src/share/vm/opto/memnode.cpp @ 583:5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
Summary: Add checks for DecodeN nodes into AutoBox elimination code.
Reviewed-by: never
| author | kvn |
|---|---|
| date | Wed, 18 Feb 2009 13:53:42 -0800 |
| parents | dca06e7f503d |
| children | 98cb887364d3 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // Portions of code courtesy of Clifford Click | |
| 26 | |
| 27 // Optimization - Graph Style | |
| 28 | |
| 29 #include "incls/_precompiled.incl" | |
| 30 #include "incls/_memnode.cpp.incl" | |
| 31 | |
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32 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st); |
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33 |
| 0 | 34 //============================================================================= |
| 35 uint MemNode::size_of() const { return sizeof(*this); } | |
| 36 | |
| 37 const TypePtr *MemNode::adr_type() const { | |
| 38 Node* adr = in(Address); | |
| 39 const TypePtr* cross_check = NULL; | |
| 40 DEBUG_ONLY(cross_check = _adr_type); | |
| 41 return calculate_adr_type(adr->bottom_type(), cross_check); | |
| 42 } | |
| 43 | |
| 44 #ifndef PRODUCT | |
| 45 void MemNode::dump_spec(outputStream *st) const { | |
| 46 if (in(Address) == NULL) return; // node is dead | |
| 47 #ifndef ASSERT | |
| 48 // fake the missing field | |
| 49 const TypePtr* _adr_type = NULL; | |
| 50 if (in(Address) != NULL) | |
| 51 _adr_type = in(Address)->bottom_type()->isa_ptr(); | |
| 52 #endif | |
| 53 dump_adr_type(this, _adr_type, st); | |
| 54 | |
| 55 Compile* C = Compile::current(); | |
| 56 if( C->alias_type(_adr_type)->is_volatile() ) | |
| 57 st->print(" Volatile!"); | |
| 58 } | |
| 59 | |
| 60 void MemNode::dump_adr_type(const Node* mem, const TypePtr* adr_type, outputStream *st) { | |
| 61 st->print(" @"); | |
| 62 if (adr_type == NULL) { | |
| 63 st->print("NULL"); | |
| 64 } else { | |
| 65 adr_type->dump_on(st); | |
| 66 Compile* C = Compile::current(); | |
| 67 Compile::AliasType* atp = NULL; | |
| 68 if (C->have_alias_type(adr_type)) atp = C->alias_type(adr_type); | |
| 69 if (atp == NULL) | |
| 70 st->print(", idx=?\?;"); | |
| 71 else if (atp->index() == Compile::AliasIdxBot) | |
| 72 st->print(", idx=Bot;"); | |
| 73 else if (atp->index() == Compile::AliasIdxTop) | |
| 74 st->print(", idx=Top;"); | |
| 75 else if (atp->index() == Compile::AliasIdxRaw) | |
| 76 st->print(", idx=Raw;"); | |
| 77 else { | |
| 78 ciField* field = atp->field(); | |
| 79 if (field) { | |
| 80 st->print(", name="); | |
| 81 field->print_name_on(st); | |
| 82 } | |
| 83 st->print(", idx=%d;", atp->index()); | |
| 84 } | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 extern void print_alias_types(); | |
| 89 | |
| 90 #endif | |
| 91 | |
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92 Node *MemNode::optimize_simple_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase) { |
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93 const TypeOopPtr *tinst = t_adr->isa_oopptr(); |
| 223 | 94 if (tinst == NULL || !tinst->is_known_instance_field()) |
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95 return mchain; // don't try to optimize non-instance types |
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96 uint instance_id = tinst->instance_id(); |
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97 Node *start_mem = phase->C->start()->proj_out(TypeFunc::Memory); |
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98 Node *prev = NULL; |
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99 Node *result = mchain; |
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100 while (prev != result) { |
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101 prev = result; |
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102 if (result == start_mem) |
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103 break; // hit one of our sentinals |
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104 // skip over a call which does not affect this memory slice |
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105 if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) { |
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106 Node *proj_in = result->in(0); |
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107 if (proj_in->is_Allocate() && proj_in->_idx == instance_id) { |
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108 break; // hit one of our sentinals |
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109 } else if (proj_in->is_Call()) { |
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110 CallNode *call = proj_in->as_Call(); |
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111 if (!call->may_modify(t_adr, phase)) { |
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112 result = call->in(TypeFunc::Memory); |
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113 } |
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114 } else if (proj_in->is_Initialize()) { |
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115 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); |
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116 // Stop if this is the initialization for the object instance which |
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117 // which contains this memory slice, otherwise skip over it. |
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118 if (alloc != NULL && alloc->_idx != instance_id) { |
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119 result = proj_in->in(TypeFunc::Memory); |
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120 } |
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121 } else if (proj_in->is_MemBar()) { |
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122 result = proj_in->in(TypeFunc::Memory); |
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123 } else { |
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124 assert(false, "unexpected projection"); |
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125 } |
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126 } else if (result->is_MergeMem()) { |
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127 result = step_through_mergemem(phase, result->as_MergeMem(), t_adr, NULL, tty); |
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128 } |
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129 } |
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130 return result; |
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131 } |
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132 |
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133 Node *MemNode::optimize_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase) { |
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134 const TypeOopPtr *t_oop = t_adr->isa_oopptr(); |
| 223 | 135 bool is_instance = (t_oop != NULL) && t_oop->is_known_instance_field(); |
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136 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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137 Node *result = mchain; |
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138 result = optimize_simple_memory_chain(result, t_adr, phase); |
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139 if (is_instance && igvn != NULL && result->is_Phi()) { |
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140 PhiNode *mphi = result->as_Phi(); |
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141 assert(mphi->bottom_type() == Type::MEMORY, "memory phi required"); |
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142 const TypePtr *t = mphi->adr_type(); |
| 163 | 143 if (t == TypePtr::BOTTOM || t == TypeRawPtr::BOTTOM || |
| 223 | 144 t->isa_oopptr() && !t->is_oopptr()->is_known_instance() && |
| 247 | 145 t->is_oopptr()->cast_to_exactness(true) |
| 146 ->is_oopptr()->cast_to_ptr_type(t_oop->ptr()) | |
| 147 ->is_oopptr()->cast_to_instance_id(t_oop->instance_id()) == t_oop) { | |
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148 // clone the Phi with our address type |
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149 result = mphi->split_out_instance(t_adr, igvn); |
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150 } else { |
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151 assert(phase->C->get_alias_index(t) == phase->C->get_alias_index(t_adr), "correct memory chain"); |
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152 } |
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153 } |
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154 return result; |
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155 } |
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156 |
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157 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st) { |
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158 uint alias_idx = phase->C->get_alias_index(tp); |
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159 Node *mem = mmem; |
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160 #ifdef ASSERT |
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161 { |
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162 // Check that current type is consistent with the alias index used during graph construction |
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163 assert(alias_idx >= Compile::AliasIdxRaw, "must not be a bad alias_idx"); |
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164 bool consistent = adr_check == NULL || adr_check->empty() || |
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165 phase->C->must_alias(adr_check, alias_idx ); |
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166 // Sometimes dead array references collapse to a[-1], a[-2], or a[-3] |
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167 if( !consistent && adr_check != NULL && !adr_check->empty() && |
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168 tp->isa_aryptr() && tp->offset() == Type::OffsetBot && |
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169 adr_check->isa_aryptr() && adr_check->offset() != Type::OffsetBot && |
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170 ( adr_check->offset() == arrayOopDesc::length_offset_in_bytes() || |
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171 adr_check->offset() == oopDesc::klass_offset_in_bytes() || |
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172 adr_check->offset() == oopDesc::mark_offset_in_bytes() ) ) { |
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173 // don't assert if it is dead code. |
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174 consistent = true; |
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175 } |
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176 if( !consistent ) { |
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177 st->print("alias_idx==%d, adr_check==", alias_idx); |
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178 if( adr_check == NULL ) { |
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179 st->print("NULL"); |
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180 } else { |
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181 adr_check->dump(); |
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182 } |
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183 st->cr(); |
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184 print_alias_types(); |
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185 assert(consistent, "adr_check must match alias idx"); |
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186 } |
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187 } |
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188 #endif |
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189 // TypeInstPtr::NOTNULL+any is an OOP with unknown offset - generally |
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190 // means an array I have not precisely typed yet. Do not do any |
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191 // alias stuff with it any time soon. |
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192 const TypeOopPtr *tinst = tp->isa_oopptr(); |
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193 if( tp->base() != Type::AnyPtr && |
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194 !(tinst && |
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195 tinst->klass()->is_java_lang_Object() && |
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196 tinst->offset() == Type::OffsetBot) ) { |
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197 // compress paths and change unreachable cycles to TOP |
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198 // If not, we can update the input infinitely along a MergeMem cycle |
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199 // Equivalent code in PhiNode::Ideal |
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200 Node* m = phase->transform(mmem); |
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201 // If tranformed to a MergeMem, get the desired slice |
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202 // Otherwise the returned node represents memory for every slice |
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203 mem = (m->is_MergeMem())? m->as_MergeMem()->memory_at(alias_idx) : m; |
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204 // Update input if it is progress over what we have now |
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205 } |
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206 return mem; |
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207 } |
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208 |
| 0 | 209 //--------------------------Ideal_common--------------------------------------- |
| 210 // Look for degenerate control and memory inputs. Bypass MergeMem inputs. | |
| 211 // Unhook non-raw memories from complete (macro-expanded) initializations. | |
| 212 Node *MemNode::Ideal_common(PhaseGVN *phase, bool can_reshape) { | |
| 213 // If our control input is a dead region, kill all below the region | |
| 214 Node *ctl = in(MemNode::Control); | |
| 215 if (ctl && remove_dead_region(phase, can_reshape)) | |
| 216 return this; | |
| 305 | 217 ctl = in(MemNode::Control); |
| 218 // Don't bother trying to transform a dead node | |
| 219 if( ctl && ctl->is_top() ) return NodeSentinel; | |
| 0 | 220 |
| 221 // Ignore if memory is dead, or self-loop | |
| 222 Node *mem = in(MemNode::Memory); | |
| 223 if( phase->type( mem ) == Type::TOP ) return NodeSentinel; // caller will return NULL | |
| 224 assert( mem != this, "dead loop in MemNode::Ideal" ); | |
| 225 | |
| 226 Node *address = in(MemNode::Address); | |
| 227 const Type *t_adr = phase->type( address ); | |
| 228 if( t_adr == Type::TOP ) return NodeSentinel; // caller will return NULL | |
| 229 | |
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230 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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231 if( can_reshape && igvn != NULL && igvn->_worklist.member(address) ) { |
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232 // The address's base and type may change when the address is processed. |
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233 // Delay this mem node transformation until the address is processed. |
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234 phase->is_IterGVN()->_worklist.push(this); |
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235 return NodeSentinel; // caller will return NULL |
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236 } |
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237 |
| 0 | 238 // Avoid independent memory operations |
| 239 Node* old_mem = mem; | |
| 240 | |
| 36 | 241 // The code which unhooks non-raw memories from complete (macro-expanded) |
| 242 // initializations was removed. After macro-expansion all stores catched | |
| 243 // by Initialize node became raw stores and there is no information | |
| 244 // which memory slices they modify. So it is unsafe to move any memory | |
| 245 // operation above these stores. Also in most cases hooked non-raw memories | |
| 246 // were already unhooked by using information from detect_ptr_independence() | |
| 247 // and find_previous_store(). | |
| 0 | 248 |
| 249 if (mem->is_MergeMem()) { | |
| 250 MergeMemNode* mmem = mem->as_MergeMem(); | |
| 251 const TypePtr *tp = t_adr->is_ptr(); | |
|
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252 |
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253 mem = step_through_mergemem(phase, mmem, tp, adr_type(), tty); |
| 0 | 254 } |
| 255 | |
| 256 if (mem != old_mem) { | |
| 257 set_req(MemNode::Memory, mem); | |
| 305 | 258 if (phase->type( mem ) == Type::TOP) return NodeSentinel; |
| 0 | 259 return this; |
| 260 } | |
| 261 | |
| 262 // let the subclass continue analyzing... | |
| 263 return NULL; | |
| 264 } | |
| 265 | |
| 266 // Helper function for proving some simple control dominations. | |
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267 // Attempt to prove that all control inputs of 'dom' dominate 'sub'. |
| 0 | 268 // Already assumes that 'dom' is available at 'sub', and that 'sub' |
| 269 // is not a constant (dominated by the method's StartNode). | |
| 270 // Used by MemNode::find_previous_store to prove that the | |
| 271 // control input of a memory operation predates (dominates) | |
| 272 // an allocation it wants to look past. | |
|
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273 bool MemNode::all_controls_dominate(Node* dom, Node* sub) { |
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274 if (dom == NULL || dom->is_top() || sub == NULL || sub->is_top()) |
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275 return false; // Conservative answer for dead code |
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276 |
|
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277 // Check 'dom'. Skip Proj and CatchProj nodes. |
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278 dom = dom->find_exact_control(dom); |
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279 if (dom == NULL || dom->is_top()) |
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280 return false; // Conservative answer for dead code |
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281 |
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282 if (dom == sub) { |
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283 // For the case when, for example, 'sub' is Initialize and the original |
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284 // 'dom' is Proj node of the 'sub'. |
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285 return false; |
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286 } |
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287 |
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288 if (dom->is_Con() || dom->is_Start() || dom->is_Root() || dom == sub) |
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289 return true; |
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290 |
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291 // 'dom' dominates 'sub' if its control edge and control edges |
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292 // of all its inputs dominate or equal to sub's control edge. |
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293 |
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294 // Currently 'sub' is either Allocate, Initialize or Start nodes. |
| 163 | 295 // Or Region for the check in LoadNode::Ideal(); |
| 296 // 'sub' should have sub->in(0) != NULL. | |
| 297 assert(sub->is_Allocate() || sub->is_Initialize() || sub->is_Start() || | |
| 298 sub->is_Region(), "expecting only these nodes"); | |
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299 |
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300 // Get control edge of 'sub'. |
|
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301 Node* orig_sub = sub; |
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302 sub = sub->find_exact_control(sub->in(0)); |
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303 if (sub == NULL || sub->is_top()) |
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304 return false; // Conservative answer for dead code |
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305 |
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306 assert(sub->is_CFG(), "expecting control"); |
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307 |
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308 if (sub == dom) |
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309 return true; |
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310 |
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311 if (sub->is_Start() || sub->is_Root()) |
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312 return false; |
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313 |
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314 { |
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315 // Check all control edges of 'dom'. |
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316 |
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317 ResourceMark rm; |
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318 Arena* arena = Thread::current()->resource_area(); |
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319 Node_List nlist(arena); |
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320 Unique_Node_List dom_list(arena); |
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321 |
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322 dom_list.push(dom); |
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323 bool only_dominating_controls = false; |
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324 |
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325 for (uint next = 0; next < dom_list.size(); next++) { |
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326 Node* n = dom_list.at(next); |
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327 if (n == orig_sub) |
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328 return false; // One of dom's inputs dominated by sub. |
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329 if (!n->is_CFG() && n->pinned()) { |
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330 // Check only own control edge for pinned non-control nodes. |
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331 n = n->find_exact_control(n->in(0)); |
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332 if (n == NULL || n->is_top()) |
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333 return false; // Conservative answer for dead code |
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334 assert(n->is_CFG(), "expecting control"); |
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335 dom_list.push(n); |
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336 } else if (n->is_Con() || n->is_Start() || n->is_Root()) { |
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337 only_dominating_controls = true; |
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338 } else if (n->is_CFG()) { |
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339 if (n->dominates(sub, nlist)) |
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340 only_dominating_controls = true; |
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341 else |
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342 return false; |
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343 } else { |
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344 // First, own control edge. |
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345 Node* m = n->find_exact_control(n->in(0)); |
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346 if (m != NULL) { |
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347 if (m->is_top()) |
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348 return false; // Conservative answer for dead code |
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349 dom_list.push(m); |
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350 } |
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351 // Now, the rest of edges. |
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352 uint cnt = n->req(); |
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353 for (uint i = 1; i < cnt; i++) { |
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354 m = n->find_exact_control(n->in(i)); |
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355 if (m == NULL || m->is_top()) |
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356 continue; |
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357 dom_list.push(m); |
| 0 | 358 } |
| 359 } | |
| 360 } | |
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361 return only_dominating_controls; |
| 0 | 362 } |
| 363 } | |
| 364 | |
| 365 //---------------------detect_ptr_independence--------------------------------- | |
| 366 // Used by MemNode::find_previous_store to prove that two base | |
| 367 // pointers are never equal. | |
| 368 // The pointers are accompanied by their associated allocations, | |
| 369 // if any, which have been previously discovered by the caller. | |
| 370 bool MemNode::detect_ptr_independence(Node* p1, AllocateNode* a1, | |
| 371 Node* p2, AllocateNode* a2, | |
| 372 PhaseTransform* phase) { | |
| 373 // Attempt to prove that these two pointers cannot be aliased. | |
| 374 // They may both manifestly be allocations, and they should differ. | |
| 375 // Or, if they are not both allocations, they can be distinct constants. | |
| 376 // Otherwise, one is an allocation and the other a pre-existing value. | |
| 377 if (a1 == NULL && a2 == NULL) { // neither an allocation | |
| 378 return (p1 != p2) && p1->is_Con() && p2->is_Con(); | |
| 379 } else if (a1 != NULL && a2 != NULL) { // both allocations | |
| 380 return (a1 != a2); | |
| 381 } else if (a1 != NULL) { // one allocation a1 | |
| 382 // (Note: p2->is_Con implies p2->in(0)->is_Root, which dominates.) | |
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383 return all_controls_dominate(p2, a1); |
| 0 | 384 } else { //(a2 != NULL) // one allocation a2 |
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385 return all_controls_dominate(p1, a2); |
| 0 | 386 } |
| 387 return false; | |
| 388 } | |
| 389 | |
| 390 | |
| 391 // The logic for reordering loads and stores uses four steps: | |
| 392 // (a) Walk carefully past stores and initializations which we | |
| 393 // can prove are independent of this load. | |
| 394 // (b) Observe that the next memory state makes an exact match | |
| 395 // with self (load or store), and locate the relevant store. | |
| 396 // (c) Ensure that, if we were to wire self directly to the store, | |
| 397 // the optimizer would fold it up somehow. | |
| 398 // (d) Do the rewiring, and return, depending on some other part of | |
| 399 // the optimizer to fold up the load. | |
| 400 // This routine handles steps (a) and (b). Steps (c) and (d) are | |
| 401 // specific to loads and stores, so they are handled by the callers. | |
| 402 // (Currently, only LoadNode::Ideal has steps (c), (d). More later.) | |
| 403 // | |
| 404 Node* MemNode::find_previous_store(PhaseTransform* phase) { | |
| 405 Node* ctrl = in(MemNode::Control); | |
| 406 Node* adr = in(MemNode::Address); | |
| 407 intptr_t offset = 0; | |
| 408 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
| 409 AllocateNode* alloc = AllocateNode::Ideal_allocation(base, phase); | |
| 410 | |
| 411 if (offset == Type::OffsetBot) | |
| 412 return NULL; // cannot unalias unless there are precise offsets | |
| 413 | |
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414 const TypeOopPtr *addr_t = adr->bottom_type()->isa_oopptr(); |
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415 |
| 0 | 416 intptr_t size_in_bytes = memory_size(); |
| 417 | |
| 418 Node* mem = in(MemNode::Memory); // start searching here... | |
| 419 | |
| 420 int cnt = 50; // Cycle limiter | |
| 421 for (;;) { // While we can dance past unrelated stores... | |
| 422 if (--cnt < 0) break; // Caught in cycle or a complicated dance? | |
| 423 | |
| 424 if (mem->is_Store()) { | |
| 425 Node* st_adr = mem->in(MemNode::Address); | |
| 426 intptr_t st_offset = 0; | |
| 427 Node* st_base = AddPNode::Ideal_base_and_offset(st_adr, phase, st_offset); | |
| 428 if (st_base == NULL) | |
| 429 break; // inscrutable pointer | |
| 430 if (st_offset != offset && st_offset != Type::OffsetBot) { | |
| 431 const int MAX_STORE = BytesPerLong; | |
| 432 if (st_offset >= offset + size_in_bytes || | |
| 433 st_offset <= offset - MAX_STORE || | |
| 434 st_offset <= offset - mem->as_Store()->memory_size()) { | |
| 435 // Success: The offsets are provably independent. | |
| 436 // (You may ask, why not just test st_offset != offset and be done? | |
| 437 // The answer is that stores of different sizes can co-exist | |
| 438 // in the same sequence of RawMem effects. We sometimes initialize | |
| 439 // a whole 'tile' of array elements with a single jint or jlong.) | |
| 440 mem = mem->in(MemNode::Memory); | |
| 441 continue; // (a) advance through independent store memory | |
| 442 } | |
| 443 } | |
| 444 if (st_base != base && | |
| 445 detect_ptr_independence(base, alloc, | |
| 446 st_base, | |
| 447 AllocateNode::Ideal_allocation(st_base, phase), | |
| 448 phase)) { | |
| 449 // Success: The bases are provably independent. | |
| 450 mem = mem->in(MemNode::Memory); | |
| 451 continue; // (a) advance through independent store memory | |
| 452 } | |
| 453 | |
| 454 // (b) At this point, if the bases or offsets do not agree, we lose, | |
| 455 // since we have not managed to prove 'this' and 'mem' independent. | |
| 456 if (st_base == base && st_offset == offset) { | |
| 457 return mem; // let caller handle steps (c), (d) | |
| 458 } | |
| 459 | |
| 460 } else if (mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
| 461 InitializeNode* st_init = mem->in(0)->as_Initialize(); | |
| 462 AllocateNode* st_alloc = st_init->allocation(); | |
| 463 if (st_alloc == NULL) | |
| 464 break; // something degenerated | |
| 465 bool known_identical = false; | |
| 466 bool known_independent = false; | |
| 467 if (alloc == st_alloc) | |
| 468 known_identical = true; | |
| 469 else if (alloc != NULL) | |
| 470 known_independent = true; | |
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471 else if (all_controls_dominate(this, st_alloc)) |
| 0 | 472 known_independent = true; |
| 473 | |
| 474 if (known_independent) { | |
| 475 // The bases are provably independent: Either they are | |
| 476 // manifestly distinct allocations, or else the control | |
| 477 // of this load dominates the store's allocation. | |
| 478 int alias_idx = phase->C->get_alias_index(adr_type()); | |
| 479 if (alias_idx == Compile::AliasIdxRaw) { | |
| 480 mem = st_alloc->in(TypeFunc::Memory); | |
| 481 } else { | |
| 482 mem = st_init->memory(alias_idx); | |
| 483 } | |
| 484 continue; // (a) advance through independent store memory | |
| 485 } | |
| 486 | |
| 487 // (b) at this point, if we are not looking at a store initializing | |
| 488 // the same allocation we are loading from, we lose. | |
| 489 if (known_identical) { | |
| 490 // From caller, can_see_stored_value will consult find_captured_store. | |
| 491 return mem; // let caller handle steps (c), (d) | |
| 492 } | |
| 493 | |
| 223 | 494 } else if (addr_t != NULL && addr_t->is_known_instance_field()) { |
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495 // Can't use optimize_simple_memory_chain() since it needs PhaseGVN. |
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496 if (mem->is_Proj() && mem->in(0)->is_Call()) { |
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497 CallNode *call = mem->in(0)->as_Call(); |
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498 if (!call->may_modify(addr_t, phase)) { |
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499 mem = call->in(TypeFunc::Memory); |
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500 continue; // (a) advance through independent call memory |
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501 } |
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502 } else if (mem->is_Proj() && mem->in(0)->is_MemBar()) { |
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503 mem = mem->in(0)->in(TypeFunc::Memory); |
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504 continue; // (a) advance through independent MemBar memory |
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505 } else if (mem->is_MergeMem()) { |
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506 int alias_idx = phase->C->get_alias_index(adr_type()); |
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507 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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508 continue; // (a) advance through independent MergeMem memory |
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509 } |
| 0 | 510 } |
| 511 | |
| 512 // Unless there is an explicit 'continue', we must bail out here, | |
| 513 // because 'mem' is an inscrutable memory state (e.g., a call). | |
| 514 break; | |
| 515 } | |
| 516 | |
| 517 return NULL; // bail out | |
| 518 } | |
| 519 | |
| 520 //----------------------calculate_adr_type------------------------------------- | |
| 521 // Helper function. Notices when the given type of address hits top or bottom. | |
| 522 // Also, asserts a cross-check of the type against the expected address type. | |
| 523 const TypePtr* MemNode::calculate_adr_type(const Type* t, const TypePtr* cross_check) { | |
| 524 if (t == Type::TOP) return NULL; // does not touch memory any more? | |
| 525 #ifdef PRODUCT | |
| 526 cross_check = NULL; | |
| 527 #else | |
| 528 if (!VerifyAliases || is_error_reported() || Node::in_dump()) cross_check = NULL; | |
| 529 #endif | |
| 530 const TypePtr* tp = t->isa_ptr(); | |
| 531 if (tp == NULL) { | |
| 532 assert(cross_check == NULL || cross_check == TypePtr::BOTTOM, "expected memory type must be wide"); | |
| 533 return TypePtr::BOTTOM; // touches lots of memory | |
| 534 } else { | |
| 535 #ifdef ASSERT | |
| 536 // %%%% [phh] We don't check the alias index if cross_check is | |
| 537 // TypeRawPtr::BOTTOM. Needs to be investigated. | |
| 538 if (cross_check != NULL && | |
| 539 cross_check != TypePtr::BOTTOM && | |
| 540 cross_check != TypeRawPtr::BOTTOM) { | |
| 541 // Recheck the alias index, to see if it has changed (due to a bug). | |
| 542 Compile* C = Compile::current(); | |
| 543 assert(C->get_alias_index(cross_check) == C->get_alias_index(tp), | |
| 544 "must stay in the original alias category"); | |
| 545 // The type of the address must be contained in the adr_type, | |
| 546 // disregarding "null"-ness. | |
| 547 // (We make an exception for TypeRawPtr::BOTTOM, which is a bit bucket.) | |
| 548 const TypePtr* tp_notnull = tp->join(TypePtr::NOTNULL)->is_ptr(); | |
| 549 assert(cross_check->meet(tp_notnull) == cross_check, | |
| 550 "real address must not escape from expected memory type"); | |
| 551 } | |
| 552 #endif | |
| 553 return tp; | |
| 554 } | |
| 555 } | |
| 556 | |
| 557 //------------------------adr_phi_is_loop_invariant---------------------------- | |
| 558 // A helper function for Ideal_DU_postCCP to check if a Phi in a counted | |
| 559 // loop is loop invariant. Make a quick traversal of Phi and associated | |
| 560 // CastPP nodes, looking to see if they are a closed group within the loop. | |
| 561 bool MemNode::adr_phi_is_loop_invariant(Node* adr_phi, Node* cast) { | |
| 562 // The idea is that the phi-nest must boil down to only CastPP nodes | |
| 563 // with the same data. This implies that any path into the loop already | |
| 564 // includes such a CastPP, and so the original cast, whatever its input, | |
| 565 // must be covered by an equivalent cast, with an earlier control input. | |
| 566 ResourceMark rm; | |
| 567 | |
| 568 // The loop entry input of the phi should be the unique dominating | |
| 569 // node for every Phi/CastPP in the loop. | |
| 570 Unique_Node_List closure; | |
| 571 closure.push(adr_phi->in(LoopNode::EntryControl)); | |
| 572 | |
| 573 // Add the phi node and the cast to the worklist. | |
| 574 Unique_Node_List worklist; | |
| 575 worklist.push(adr_phi); | |
| 576 if( cast != NULL ){ | |
| 577 if( !cast->is_ConstraintCast() ) return false; | |
| 578 worklist.push(cast); | |
| 579 } | |
| 580 | |
| 581 // Begin recursive walk of phi nodes. | |
| 582 while( worklist.size() ){ | |
| 583 // Take a node off the worklist | |
| 584 Node *n = worklist.pop(); | |
| 585 if( !closure.member(n) ){ | |
| 586 // Add it to the closure. | |
| 587 closure.push(n); | |
| 588 // Make a sanity check to ensure we don't waste too much time here. | |
| 589 if( closure.size() > 20) return false; | |
| 590 // This node is OK if: | |
| 591 // - it is a cast of an identical value | |
| 592 // - or it is a phi node (then we add its inputs to the worklist) | |
| 593 // Otherwise, the node is not OK, and we presume the cast is not invariant | |
| 594 if( n->is_ConstraintCast() ){ | |
| 595 worklist.push(n->in(1)); | |
| 596 } else if( n->is_Phi() ) { | |
| 597 for( uint i = 1; i < n->req(); i++ ) { | |
| 598 worklist.push(n->in(i)); | |
| 599 } | |
| 600 } else { | |
| 601 return false; | |
| 602 } | |
| 603 } | |
| 604 } | |
| 605 | |
| 606 // Quit when the worklist is empty, and we've found no offending nodes. | |
| 607 return true; | |
| 608 } | |
| 609 | |
| 610 //------------------------------Ideal_DU_postCCP------------------------------- | |
| 611 // Find any cast-away of null-ness and keep its control. Null cast-aways are | |
| 612 // going away in this pass and we need to make this memory op depend on the | |
| 613 // gating null check. | |
| 163 | 614 Node *MemNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
| 615 return Ideal_common_DU_postCCP(ccp, this, in(MemNode::Address)); | |
| 616 } | |
| 0 | 617 |
| 618 // I tried to leave the CastPP's in. This makes the graph more accurate in | |
| 619 // some sense; we get to keep around the knowledge that an oop is not-null | |
| 620 // after some test. Alas, the CastPP's interfere with GVN (some values are | |
| 621 // the regular oop, some are the CastPP of the oop, all merge at Phi's which | |
| 622 // cannot collapse, etc). This cost us 10% on SpecJVM, even when I removed | |
| 623 // some of the more trivial cases in the optimizer. Removing more useless | |
| 624 // Phi's started allowing Loads to illegally float above null checks. I gave | |
| 625 // up on this approach. CNC 10/20/2000 | |
| 163 | 626 // This static method may be called not from MemNode (EncodePNode calls it). |
| 627 // Only the control edge of the node 'n' might be updated. | |
| 628 Node *MemNode::Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr ) { | |
| 0 | 629 Node *skipped_cast = NULL; |
| 630 // Need a null check? Regular static accesses do not because they are | |
| 631 // from constant addresses. Array ops are gated by the range check (which | |
| 632 // always includes a NULL check). Just check field ops. | |
| 163 | 633 if( n->in(MemNode::Control) == NULL ) { |
| 0 | 634 // Scan upwards for the highest location we can place this memory op. |
| 635 while( true ) { | |
| 636 switch( adr->Opcode() ) { | |
| 637 | |
| 638 case Op_AddP: // No change to NULL-ness, so peek thru AddP's | |
| 639 adr = adr->in(AddPNode::Base); | |
| 640 continue; | |
| 641 | |
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642 case Op_DecodeN: // No change to NULL-ness, so peek thru |
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643 adr = adr->in(1); |
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644 continue; |
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645 |
| 0 | 646 case Op_CastPP: |
| 647 // If the CastPP is useless, just peek on through it. | |
| 648 if( ccp->type(adr) == ccp->type(adr->in(1)) ) { | |
| 649 // Remember the cast that we've peeked though. If we peek | |
| 650 // through more than one, then we end up remembering the highest | |
| 651 // one, that is, if in a loop, the one closest to the top. | |
| 652 skipped_cast = adr; | |
| 653 adr = adr->in(1); | |
| 654 continue; | |
| 655 } | |
| 656 // CastPP is going away in this pass! We need this memory op to be | |
| 657 // control-dependent on the test that is guarding the CastPP. | |
| 163 | 658 ccp->hash_delete(n); |
| 659 n->set_req(MemNode::Control, adr->in(0)); | |
| 660 ccp->hash_insert(n); | |
| 661 return n; | |
| 0 | 662 |
| 663 case Op_Phi: | |
| 664 // Attempt to float above a Phi to some dominating point. | |
| 665 if (adr->in(0) != NULL && adr->in(0)->is_CountedLoop()) { | |
| 666 // If we've already peeked through a Cast (which could have set the | |
| 667 // control), we can't float above a Phi, because the skipped Cast | |
| 668 // may not be loop invariant. | |
| 669 if (adr_phi_is_loop_invariant(adr, skipped_cast)) { | |
| 670 adr = adr->in(1); | |
| 671 continue; | |
| 672 } | |
| 673 } | |
| 674 | |
| 675 // Intentional fallthrough! | |
| 676 | |
| 677 // No obvious dominating point. The mem op is pinned below the Phi | |
| 678 // by the Phi itself. If the Phi goes away (no true value is merged) | |
| 679 // then the mem op can float, but not indefinitely. It must be pinned | |
| 680 // behind the controls leading to the Phi. | |
| 681 case Op_CheckCastPP: | |
| 682 // These usually stick around to change address type, however a | |
| 683 // useless one can be elided and we still need to pick up a control edge | |
| 684 if (adr->in(0) == NULL) { | |
| 685 // This CheckCastPP node has NO control and is likely useless. But we | |
| 686 // need check further up the ancestor chain for a control input to keep | |
| 687 // the node in place. 4959717. | |
| 688 skipped_cast = adr; | |
| 689 adr = adr->in(1); | |
| 690 continue; | |
| 691 } | |
| 163 | 692 ccp->hash_delete(n); |
| 693 n->set_req(MemNode::Control, adr->in(0)); | |
| 694 ccp->hash_insert(n); | |
| 695 return n; | |
| 0 | 696 |
| 697 // List of "safe" opcodes; those that implicitly block the memory | |
| 698 // op below any null check. | |
| 699 case Op_CastX2P: // no null checks on native pointers | |
| 700 case Op_Parm: // 'this' pointer is not null | |
| 701 case Op_LoadP: // Loading from within a klass | |
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702 case Op_LoadN: // Loading from within a klass |
| 0 | 703 case Op_LoadKlass: // Loading from within a klass |
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704 case Op_LoadNKlass: // Loading from within a klass |
| 0 | 705 case Op_ConP: // Loading from a klass |
| 163 | 706 case Op_ConN: // Loading from a klass |
| 0 | 707 case Op_CreateEx: // Sucking up the guts of an exception oop |
| 708 case Op_Con: // Reading from TLS | |
| 709 case Op_CMoveP: // CMoveP is pinned | |
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710 case Op_CMoveN: // CMoveN is pinned |
| 0 | 711 break; // No progress |
| 712 | |
| 713 case Op_Proj: // Direct call to an allocation routine | |
| 714 case Op_SCMemProj: // Memory state from store conditional ops | |
| 715 #ifdef ASSERT | |
| 716 { | |
| 717 assert(adr->as_Proj()->_con == TypeFunc::Parms, "must be return value"); | |
| 718 const Node* call = adr->in(0); | |
| 163 | 719 if (call->is_CallJava()) { |
| 720 const CallJavaNode* call_java = call->as_CallJava(); | |
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721 const TypeTuple *r = call_java->tf()->range(); |
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722 assert(r->cnt() > TypeFunc::Parms, "must return value"); |
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723 const Type* ret_type = r->field_at(TypeFunc::Parms); |
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724 assert(ret_type && ret_type->isa_ptr(), "must return pointer"); |
| 0 | 725 // We further presume that this is one of |
| 726 // new_instance_Java, new_array_Java, or | |
| 727 // the like, but do not assert for this. | |
| 728 } else if (call->is_Allocate()) { | |
| 729 // similar case to new_instance_Java, etc. | |
| 730 } else if (!call->is_CallLeaf()) { | |
| 731 // Projections from fetch_oop (OSR) are allowed as well. | |
| 732 ShouldNotReachHere(); | |
| 733 } | |
| 734 } | |
| 735 #endif | |
| 736 break; | |
| 737 default: | |
| 738 ShouldNotReachHere(); | |
| 739 } | |
| 740 break; | |
| 741 } | |
| 742 } | |
| 743 | |
| 744 return NULL; // No progress | |
| 745 } | |
| 746 | |
| 747 | |
| 748 //============================================================================= | |
| 749 uint LoadNode::size_of() const { return sizeof(*this); } | |
| 750 uint LoadNode::cmp( const Node &n ) const | |
| 751 { return !Type::cmp( _type, ((LoadNode&)n)._type ); } | |
| 752 const Type *LoadNode::bottom_type() const { return _type; } | |
| 753 uint LoadNode::ideal_reg() const { | |
| 754 return Matcher::base2reg[_type->base()]; | |
| 755 } | |
| 756 | |
| 757 #ifndef PRODUCT | |
| 758 void LoadNode::dump_spec(outputStream *st) const { | |
| 759 MemNode::dump_spec(st); | |
| 760 if( !Verbose && !WizardMode ) { | |
| 761 // standard dump does this in Verbose and WizardMode | |
| 762 st->print(" #"); _type->dump_on(st); | |
| 763 } | |
| 764 } | |
| 765 #endif | |
| 766 | |
| 767 | |
| 768 //----------------------------LoadNode::make----------------------------------- | |
| 769 // Polymorphic factory method: | |
|
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770 Node *LoadNode::make( PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const TypePtr* adr_type, const Type *rt, BasicType bt ) { |
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771 Compile* C = gvn.C; |
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772 |
| 0 | 773 // sanity check the alias category against the created node type |
| 774 assert(!(adr_type->isa_oopptr() && | |
| 775 adr_type->offset() == oopDesc::klass_offset_in_bytes()), | |
| 776 "use LoadKlassNode instead"); | |
| 777 assert(!(adr_type->isa_aryptr() && | |
| 778 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()), | |
| 779 "use LoadRangeNode instead"); | |
| 780 switch (bt) { | |
| 781 case T_BOOLEAN: | |
|
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782 case T_BYTE: return new (C, 3) LoadBNode (ctl, mem, adr, adr_type, rt->is_int() ); |
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783 case T_INT: return new (C, 3) LoadINode (ctl, mem, adr, adr_type, rt->is_int() ); |
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784 case T_CHAR: return new (C, 3) LoadUSNode(ctl, mem, adr, adr_type, rt->is_int() ); |
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785 case T_SHORT: return new (C, 3) LoadSNode (ctl, mem, adr, adr_type, rt->is_int() ); |
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786 case T_LONG: return new (C, 3) LoadLNode (ctl, mem, adr, adr_type, rt->is_long() ); |
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787 case T_FLOAT: return new (C, 3) LoadFNode (ctl, mem, adr, adr_type, rt ); |
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788 case T_DOUBLE: return new (C, 3) LoadDNode (ctl, mem, adr, adr_type, rt ); |
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789 case T_ADDRESS: return new (C, 3) LoadPNode (ctl, mem, adr, adr_type, rt->is_ptr() ); |
|
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790 case T_OBJECT: |
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791 #ifdef _LP64 |
| 163 | 792 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
|
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793 Node* load = gvn.transform(new (C, 3) LoadNNode(ctl, mem, adr, adr_type, rt->make_narrowoop())); |
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794 return new (C, 2) DecodeNNode(load, load->bottom_type()->make_ptr()); |
|
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795 } else |
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796 #endif |
| 163 | 797 { |
| 798 assert(!adr->bottom_type()->is_ptr_to_narrowoop(), "should have got back a narrow oop"); | |
| 799 return new (C, 3) LoadPNode(ctl, mem, adr, adr_type, rt->is_oopptr()); | |
| 800 } | |
| 0 | 801 } |
| 802 ShouldNotReachHere(); | |
| 803 return (LoadNode*)NULL; | |
| 804 } | |
| 805 | |
| 806 LoadLNode* LoadLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt) { | |
| 807 bool require_atomic = true; | |
| 808 return new (C, 3) LoadLNode(ctl, mem, adr, adr_type, rt->is_long(), require_atomic); | |
| 809 } | |
| 810 | |
| 811 | |
| 812 | |
| 813 | |
| 814 //------------------------------hash------------------------------------------- | |
| 815 uint LoadNode::hash() const { | |
| 816 // unroll addition of interesting fields | |
| 817 return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address); | |
| 818 } | |
| 819 | |
| 820 //---------------------------can_see_stored_value------------------------------ | |
| 821 // This routine exists to make sure this set of tests is done the same | |
| 822 // everywhere. We need to make a coordinated change: first LoadNode::Ideal | |
| 823 // will change the graph shape in a way which makes memory alive twice at the | |
| 824 // same time (uses the Oracle model of aliasing), then some | |
| 825 // LoadXNode::Identity will fold things back to the equivalence-class model | |
| 826 // of aliasing. | |
| 827 Node* MemNode::can_see_stored_value(Node* st, PhaseTransform* phase) const { | |
| 828 Node* ld_adr = in(MemNode::Address); | |
| 829 | |
|
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830 const TypeInstPtr* tp = phase->type(ld_adr)->isa_instptr(); |
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831 Compile::AliasType* atp = tp != NULL ? phase->C->alias_type(tp) : NULL; |
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832 if (EliminateAutoBox && atp != NULL && atp->index() >= Compile::AliasIdxRaw && |
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833 atp->field() != NULL && !atp->field()->is_volatile()) { |
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834 uint alias_idx = atp->index(); |
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835 bool final = atp->field()->is_final(); |
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836 Node* result = NULL; |
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837 Node* current = st; |
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838 // Skip through chains of MemBarNodes checking the MergeMems for |
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839 // new states for the slice of this load. Stop once any other |
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840 // kind of node is encountered. Loads from final memory can skip |
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841 // through any kind of MemBar but normal loads shouldn't skip |
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842 // through MemBarAcquire since the could allow them to move out of |
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843 // a synchronized region. |
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844 while (current->is_Proj()) { |
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845 int opc = current->in(0)->Opcode(); |
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846 if ((final && opc == Op_MemBarAcquire) || |
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847 opc == Op_MemBarRelease || opc == Op_MemBarCPUOrder) { |
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848 Node* mem = current->in(0)->in(TypeFunc::Memory); |
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849 if (mem->is_MergeMem()) { |
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850 MergeMemNode* merge = mem->as_MergeMem(); |
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851 Node* new_st = merge->memory_at(alias_idx); |
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852 if (new_st == merge->base_memory()) { |
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853 // Keep searching |
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854 current = merge->base_memory(); |
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855 continue; |
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856 } |
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857 // Save the new memory state for the slice and fall through |
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858 // to exit. |
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859 result = new_st; |
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860 } |
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861 } |
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862 break; |
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863 } |
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864 if (result != NULL) { |
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865 st = result; |
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866 } |
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867 } |
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868 |
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869 |
| 0 | 870 // Loop around twice in the case Load -> Initialize -> Store. |
| 871 // (See PhaseIterGVN::add_users_to_worklist, which knows about this case.) | |
| 872 for (int trip = 0; trip <= 1; trip++) { | |
| 873 | |
| 874 if (st->is_Store()) { | |
| 875 Node* st_adr = st->in(MemNode::Address); | |
| 876 if (!phase->eqv(st_adr, ld_adr)) { | |
| 877 // Try harder before giving up... Match raw and non-raw pointers. | |
| 878 intptr_t st_off = 0; | |
| 879 AllocateNode* alloc = AllocateNode::Ideal_allocation(st_adr, phase, st_off); | |
| 880 if (alloc == NULL) return NULL; | |
| 881 intptr_t ld_off = 0; | |
| 882 AllocateNode* allo2 = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off); | |
| 883 if (alloc != allo2) return NULL; | |
| 884 if (ld_off != st_off) return NULL; | |
| 885 // At this point we have proven something like this setup: | |
| 886 // A = Allocate(...) | |
| 887 // L = LoadQ(, AddP(CastPP(, A.Parm),, #Off)) | |
| 888 // S = StoreQ(, AddP(, A.Parm , #Off), V) | |
| 889 // (Actually, we haven't yet proven the Q's are the same.) | |
| 890 // In other words, we are loading from a casted version of | |
| 891 // the same pointer-and-offset that we stored to. | |
| 892 // Thus, we are able to replace L by V. | |
| 893 } | |
| 894 // Now prove that we have a LoadQ matched to a StoreQ, for some Q. | |
| 895 if (store_Opcode() != st->Opcode()) | |
| 896 return NULL; | |
| 897 return st->in(MemNode::ValueIn); | |
| 898 } | |
| 899 | |
| 900 intptr_t offset = 0; // scratch | |
| 901 | |
| 902 // A load from a freshly-created object always returns zero. | |
| 903 // (This can happen after LoadNode::Ideal resets the load's memory input | |
| 904 // to find_captured_store, which returned InitializeNode::zero_memory.) | |
| 905 if (st->is_Proj() && st->in(0)->is_Allocate() && | |
| 906 st->in(0) == AllocateNode::Ideal_allocation(ld_adr, phase, offset) && | |
| 907 offset >= st->in(0)->as_Allocate()->minimum_header_size()) { | |
| 908 // return a zero value for the load's basic type | |
| 909 // (This is one of the few places where a generic PhaseTransform | |
| 910 // can create new nodes. Think of it as lazily manifesting | |
| 911 // virtually pre-existing constants.) | |
| 912 return phase->zerocon(memory_type()); | |
| 913 } | |
| 914 | |
| 915 // A load from an initialization barrier can match a captured store. | |
| 916 if (st->is_Proj() && st->in(0)->is_Initialize()) { | |
| 917 InitializeNode* init = st->in(0)->as_Initialize(); | |
| 918 AllocateNode* alloc = init->allocation(); | |
| 919 if (alloc != NULL && | |
| 920 alloc == AllocateNode::Ideal_allocation(ld_adr, phase, offset)) { | |
| 921 // examine a captured store value | |
| 922 st = init->find_captured_store(offset, memory_size(), phase); | |
| 923 if (st != NULL) | |
| 924 continue; // take one more trip around | |
| 925 } | |
| 926 } | |
| 927 | |
| 928 break; | |
| 929 } | |
| 930 | |
| 931 return NULL; | |
| 932 } | |
| 933 | |
|
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934 //----------------------is_instance_field_load_with_local_phi------------------ |
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935 bool LoadNode::is_instance_field_load_with_local_phi(Node* ctrl) { |
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936 if( in(MemNode::Memory)->is_Phi() && in(MemNode::Memory)->in(0) == ctrl && |
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937 in(MemNode::Address)->is_AddP() ) { |
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938 const TypeOopPtr* t_oop = in(MemNode::Address)->bottom_type()->isa_oopptr(); |
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939 // Only instances. |
| 223 | 940 if( t_oop != NULL && t_oop->is_known_instance_field() && |
|
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941 t_oop->offset() != Type::OffsetBot && |
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942 t_oop->offset() != Type::OffsetTop) { |
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943 return true; |
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944 } |
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945 } |
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946 return false; |
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diff
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|
947 } |
|
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diff
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|
948 |
| 0 | 949 //------------------------------Identity--------------------------------------- |
| 950 // Loads are identity if previous store is to same address | |
| 951 Node *LoadNode::Identity( PhaseTransform *phase ) { | |
| 952 // If the previous store-maker is the right kind of Store, and the store is | |
| 953 // to the same address, then we are equal to the value stored. | |
| 954 Node* mem = in(MemNode::Memory); | |
| 955 Node* value = can_see_stored_value(mem, phase); | |
| 956 if( value ) { | |
| 957 // byte, short & char stores truncate naturally. | |
| 958 // A load has to load the truncated value which requires | |
| 959 // some sort of masking operation and that requires an | |
| 960 // Ideal call instead of an Identity call. | |
| 961 if (memory_size() < BytesPerInt) { | |
| 962 // If the input to the store does not fit with the load's result type, | |
| 963 // it must be truncated via an Ideal call. | |
| 964 if (!phase->type(value)->higher_equal(phase->type(this))) | |
| 965 return this; | |
| 966 } | |
| 967 // (This works even when value is a Con, but LoadNode::Value | |
| 968 // usually runs first, producing the singleton type of the Con.) | |
| 969 return value; | |
| 970 } | |
|
64
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|
971 |
|
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|
972 // Search for an existing data phi which was generated before for the same |
|
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|
973 // instance's field to avoid infinite genertion of phis in a loop. |
|
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|
974 Node *region = mem->in(0); |
|
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|
975 if (is_instance_field_load_with_local_phi(region)) { |
|
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|
976 const TypePtr *addr_t = in(MemNode::Address)->bottom_type()->isa_ptr(); |
|
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977 int this_index = phase->C->get_alias_index(addr_t); |
|
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|
978 int this_offset = addr_t->offset(); |
|
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979 int this_id = addr_t->is_oopptr()->instance_id(); |
|
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980 const Type* this_type = bottom_type(); |
|
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981 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
|
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|
982 Node* phi = region->fast_out(i); |
|
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983 if (phi->is_Phi() && phi != mem && |
|
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|
984 phi->as_Phi()->is_same_inst_field(this_type, this_id, this_index, this_offset)) { |
|
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|
985 return phi; |
|
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|
986 } |
|
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|
987 } |
|
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|
988 } |
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989 |
| 0 | 990 return this; |
| 991 } | |
| 992 | |
|
17
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993 |
|
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994 // Returns true if the AliasType refers to the field that holds the |
|
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995 // cached box array. Currently only handles the IntegerCache case. |
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996 static bool is_autobox_cache(Compile::AliasType* atp) { |
|
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997 if (atp != NULL && atp->field() != NULL) { |
|
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998 ciField* field = atp->field(); |
|
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999 ciSymbol* klass = field->holder()->name(); |
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1000 if (field->name() == ciSymbol::cache_field_name() && |
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1001 field->holder()->uses_default_loader() && |
|
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1002 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
|
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1003 return true; |
|
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|
1004 } |
|
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|
1005 } |
|
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|
1006 return false; |
|
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|
1007 } |
|
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|
1008 |
|
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|
1009 // Fetch the base value in the autobox array |
|
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|
1010 static bool fetch_autobox_base(Compile::AliasType* atp, int& cache_offset) { |
|
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1011 if (atp != NULL && atp->field() != NULL) { |
|
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1012 ciField* field = atp->field(); |
|
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1013 ciSymbol* klass = field->holder()->name(); |
|
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1014 if (field->name() == ciSymbol::cache_field_name() && |
|
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1015 field->holder()->uses_default_loader() && |
|
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1016 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
|
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|
1017 assert(field->is_constant(), "what?"); |
|
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1018 ciObjArray* array = field->constant_value().as_object()->as_obj_array(); |
|
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1019 // Fetch the box object at the base of the array and get its value |
|
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1020 ciInstance* box = array->obj_at(0)->as_instance(); |
|
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1021 ciInstanceKlass* ik = box->klass()->as_instance_klass(); |
|
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1022 if (ik->nof_nonstatic_fields() == 1) { |
|
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1023 // This should be true nonstatic_field_at requires calling |
|
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|
1024 // nof_nonstatic_fields so check it anyway |
|
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|
1025 ciConstant c = box->field_value(ik->nonstatic_field_at(0)); |
|
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|
1026 cache_offset = c.as_int(); |
|
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|
1027 } |
|
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|
1028 return true; |
|
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|
1029 } |
|
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|
1030 } |
|
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|
1031 return false; |
|
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|
1032 } |
|
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parents:
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|
1033 |
|
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|
1034 // Returns true if the AliasType refers to the value field of an |
|
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|
1035 // autobox object. Currently only handles Integer. |
|
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|
1036 static bool is_autobox_object(Compile::AliasType* atp) { |
|
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|
1037 if (atp != NULL && atp->field() != NULL) { |
|
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|
1038 ciField* field = atp->field(); |
|
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|
1039 ciSymbol* klass = field->holder()->name(); |
|
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|
1040 if (field->name() == ciSymbol::value_name() && |
|
ff5961f4c095
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|
1041 field->holder()->uses_default_loader() && |
|
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parents:
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|
1042 klass == ciSymbol::java_lang_Integer()) { |
|
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|
1043 return true; |
|
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|
1044 } |
|
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|
1045 } |
|
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|
1046 return false; |
|
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|
1047 } |
|
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|
1048 |
|
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|
1049 |
|
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|
1050 // We're loading from an object which has autobox behaviour. |
|
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|
1051 // If this object is result of a valueOf call we'll have a phi |
|
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|
1052 // merging a newly allocated object and a load from the cache. |
|
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|
1053 // We want to replace this load with the original incoming |
|
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|
1054 // argument to the valueOf call. |
|
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|
1055 Node* LoadNode::eliminate_autobox(PhaseGVN* phase) { |
|
ff5961f4c095
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|
1056 Node* base = in(Address)->in(AddPNode::Base); |
|
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|
1057 if (base->is_Phi() && base->req() == 3) { |
|
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|
1058 AllocateNode* allocation = NULL; |
|
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|
1059 int allocation_index = -1; |
|
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|
1060 int load_index = -1; |
|
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|
1061 for (uint i = 1; i < base->req(); i++) { |
|
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|
1062 allocation = AllocateNode::Ideal_allocation(base->in(i), phase); |
|
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|
1063 if (allocation != NULL) { |
|
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|
1064 allocation_index = i; |
|
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|
1065 load_index = 3 - allocation_index; |
|
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|
1066 break; |
|
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|
1067 } |
|
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|
1068 } |
|
583
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1069 bool has_load = ( allocation != NULL && |
|
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1070 (base->in(load_index)->is_Load() || |
|
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
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570
diff
changeset
|
1071 base->in(load_index)->is_DecodeN() && |
|
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1072 base->in(load_index)->in(1)->is_Load()) ); |
|
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1073 if (has_load && in(Memory)->is_Phi() && in(Memory)->in(0) == base->in(0)) { |
|
17
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0
diff
changeset
|
1074 // Push the loads from the phi that comes from valueOf up |
|
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diff
changeset
|
1075 // through it to allow elimination of the loads and the recovery |
|
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parents:
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diff
changeset
|
1076 // of the original value. |
|
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parents:
0
diff
changeset
|
1077 Node* mem_phi = in(Memory); |
|
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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1078 Node* offset = in(Address)->in(AddPNode::Offset); |
| 553 | 1079 Node* region = base->in(0); |
|
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1080 |
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1081 Node* in1 = clone(); |
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1082 Node* in1_addr = in1->in(Address)->clone(); |
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1083 in1_addr->set_req(AddPNode::Base, base->in(allocation_index)); |
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1084 in1_addr->set_req(AddPNode::Address, base->in(allocation_index)); |
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1085 in1_addr->set_req(AddPNode::Offset, offset); |
| 553 | 1086 in1->set_req(0, region->in(allocation_index)); |
|
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1087 in1->set_req(Address, in1_addr); |
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1088 in1->set_req(Memory, mem_phi->in(allocation_index)); |
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1089 |
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1090 Node* in2 = clone(); |
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1091 Node* in2_addr = in2->in(Address)->clone(); |
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1092 in2_addr->set_req(AddPNode::Base, base->in(load_index)); |
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1093 in2_addr->set_req(AddPNode::Address, base->in(load_index)); |
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1094 in2_addr->set_req(AddPNode::Offset, offset); |
| 553 | 1095 in2->set_req(0, region->in(load_index)); |
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1096 in2->set_req(Address, in2_addr); |
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1097 in2->set_req(Memory, mem_phi->in(load_index)); |
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1098 |
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1099 in1_addr = phase->transform(in1_addr); |
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1100 in1 = phase->transform(in1); |
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1101 in2_addr = phase->transform(in2_addr); |
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1102 in2 = phase->transform(in2); |
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1103 |
| 553 | 1104 PhiNode* result = PhiNode::make_blank(region, this); |
|
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1105 result->set_req(allocation_index, in1); |
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1106 result->set_req(load_index, in2); |
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1107 return result; |
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1108 } |
|
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1109 } else if (base->is_Load() || |
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1110 base->is_DecodeN() && base->in(1)->is_Load()) { |
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1111 if (base->is_DecodeN()) { |
|
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1112 // Get LoadN node which loads cached Integer object |
|
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1113 base = base->in(1); |
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1114 } |
|
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1115 // Eliminate the load of Integer.value for integers from the cache |
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1116 // array by deriving the value from the index into the array. |
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1117 // Capture the offset of the load and then reverse the computation. |
|
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1118 Node* load_base = base->in(Address)->in(AddPNode::Base); |
|
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1119 if (load_base->is_DecodeN()) { |
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1120 // Get LoadN node which loads IntegerCache.cache field |
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1121 load_base = load_base->in(1); |
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1122 } |
|
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1123 if (load_base != NULL) { |
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1124 Compile::AliasType* atp = phase->C->alias_type(load_base->adr_type()); |
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1125 intptr_t cache_offset; |
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1126 int shift = -1; |
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1127 Node* cache = NULL; |
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1128 if (is_autobox_cache(atp)) { |
|
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1129 shift = exact_log2(type2aelembytes(T_OBJECT)); |
|
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1130 cache = AddPNode::Ideal_base_and_offset(load_base->in(Address), phase, cache_offset); |
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1131 } |
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1132 if (cache != NULL && base->in(Address)->is_AddP()) { |
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1133 Node* elements[4]; |
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1134 int count = base->in(Address)->as_AddP()->unpack_offsets(elements, ARRAY_SIZE(elements)); |
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1135 int cache_low; |
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1136 if (count > 0 && fetch_autobox_base(atp, cache_low)) { |
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1137 int offset = arrayOopDesc::base_offset_in_bytes(memory_type()) - (cache_low << shift); |
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1138 // Add up all the offsets making of the address of the load |
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1139 Node* result = elements[0]; |
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1140 for (int i = 1; i < count; i++) { |
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1141 result = phase->transform(new (phase->C, 3) AddXNode(result, elements[i])); |
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1142 } |
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1143 // Remove the constant offset from the address and then |
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1144 // remove the scaling of the offset to recover the original index. |
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1145 result = phase->transform(new (phase->C, 3) AddXNode(result, phase->MakeConX(-offset))); |
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1146 if (result->Opcode() == Op_LShiftX && result->in(2) == phase->intcon(shift)) { |
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1147 // Peel the shift off directly but wrap it in a dummy node |
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1148 // since Ideal can't return existing nodes |
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1149 result = new (phase->C, 3) RShiftXNode(result->in(1), phase->intcon(0)); |
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1150 } else { |
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1151 result = new (phase->C, 3) RShiftXNode(result, phase->intcon(shift)); |
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1152 } |
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1153 #ifdef _LP64 |
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1154 result = new (phase->C, 2) ConvL2INode(phase->transform(result)); |
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1155 #endif |
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1156 return result; |
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1157 } |
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1158 } |
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1159 } |
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1160 } |
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1161 return NULL; |
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1162 } |
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1163 |
| 163 | 1164 //------------------------------split_through_phi------------------------------ |
| 1165 // Split instance field load through Phi. | |
| 1166 Node *LoadNode::split_through_phi(PhaseGVN *phase) { | |
| 1167 Node* mem = in(MemNode::Memory); | |
| 1168 Node* address = in(MemNode::Address); | |
| 1169 const TypePtr *addr_t = phase->type(address)->isa_ptr(); | |
| 1170 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); | |
| 1171 | |
| 1172 assert(mem->is_Phi() && (t_oop != NULL) && | |
| 223 | 1173 t_oop->is_known_instance_field(), "invalide conditions"); |
| 163 | 1174 |
| 1175 Node *region = mem->in(0); | |
| 1176 if (region == NULL) { | |
| 1177 return NULL; // Wait stable graph | |
| 1178 } | |
| 1179 uint cnt = mem->req(); | |
| 1180 for( uint i = 1; i < cnt; i++ ) { | |
| 1181 Node *in = mem->in(i); | |
| 1182 if( in == NULL ) { | |
| 1183 return NULL; // Wait stable graph | |
| 1184 } | |
| 1185 } | |
| 1186 // Check for loop invariant. | |
| 1187 if (cnt == 3) { | |
| 1188 for( uint i = 1; i < cnt; i++ ) { | |
| 1189 Node *in = mem->in(i); | |
| 1190 Node* m = MemNode::optimize_memory_chain(in, addr_t, phase); | |
| 1191 if (m == mem) { | |
| 1192 set_req(MemNode::Memory, mem->in(cnt - i)); // Skip this phi. | |
| 1193 return this; | |
| 1194 } | |
| 1195 } | |
| 1196 } | |
| 1197 // Split through Phi (see original code in loopopts.cpp). | |
| 1198 assert(phase->C->have_alias_type(addr_t), "instance should have alias type"); | |
| 1199 | |
| 1200 // Do nothing here if Identity will find a value | |
| 1201 // (to avoid infinite chain of value phis generation). | |
| 1202 if ( !phase->eqv(this, this->Identity(phase)) ) | |
| 1203 return NULL; | |
| 1204 | |
| 1205 // Skip the split if the region dominates some control edge of the address. | |
| 1206 if (cnt == 3 && !MemNode::all_controls_dominate(address, region)) | |
| 1207 return NULL; | |
| 1208 | |
| 1209 const Type* this_type = this->bottom_type(); | |
| 1210 int this_index = phase->C->get_alias_index(addr_t); | |
| 1211 int this_offset = addr_t->offset(); | |
| 1212 int this_iid = addr_t->is_oopptr()->instance_id(); | |
| 1213 int wins = 0; | |
| 1214 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
| 1215 Node *phi = new (igvn->C, region->req()) PhiNode(region, this_type, NULL, this_iid, this_index, this_offset); | |
| 1216 for( uint i = 1; i < region->req(); i++ ) { | |
| 1217 Node *x; | |
| 1218 Node* the_clone = NULL; | |
| 1219 if( region->in(i) == phase->C->top() ) { | |
| 1220 x = phase->C->top(); // Dead path? Use a dead data op | |
| 1221 } else { | |
| 1222 x = this->clone(); // Else clone up the data op | |
| 1223 the_clone = x; // Remember for possible deletion. | |
| 1224 // Alter data node to use pre-phi inputs | |
| 1225 if( this->in(0) == region ) { | |
| 1226 x->set_req( 0, region->in(i) ); | |
| 1227 } else { | |
| 1228 x->set_req( 0, NULL ); | |
| 1229 } | |
| 1230 for( uint j = 1; j < this->req(); j++ ) { | |
| 1231 Node *in = this->in(j); | |
| 1232 if( in->is_Phi() && in->in(0) == region ) | |
| 1233 x->set_req( j, in->in(i) ); // Use pre-Phi input for the clone | |
| 1234 } | |
| 1235 } | |
| 1236 // Check for a 'win' on some paths | |
| 1237 const Type *t = x->Value(igvn); | |
| 1238 | |
| 1239 bool singleton = t->singleton(); | |
| 1240 | |
| 1241 // See comments in PhaseIdealLoop::split_thru_phi(). | |
| 1242 if( singleton && t == Type::TOP ) { | |
| 1243 singleton &= region->is_Loop() && (i != LoopNode::EntryControl); | |
| 1244 } | |
| 1245 | |
| 1246 if( singleton ) { | |
| 1247 wins++; | |
| 1248 x = igvn->makecon(t); | |
| 1249 } else { | |
| 1250 // We now call Identity to try to simplify the cloned node. | |
| 1251 // Note that some Identity methods call phase->type(this). | |
| 1252 // Make sure that the type array is big enough for | |
| 1253 // our new node, even though we may throw the node away. | |
| 1254 // (This tweaking with igvn only works because x is a new node.) | |
| 1255 igvn->set_type(x, t); | |
|
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1256 // If x is a TypeNode, capture any more-precise type permanently into Node |
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1257 // othewise it will be not updated during igvn->transform since |
|
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1258 // igvn->type(x) is set to x->Value() already. |
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1259 x->raise_bottom_type(t); |
| 163 | 1260 Node *y = x->Identity(igvn); |
| 1261 if( y != x ) { | |
| 1262 wins++; | |
| 1263 x = y; | |
| 1264 } else { | |
| 1265 y = igvn->hash_find(x); | |
| 1266 if( y ) { | |
| 1267 wins++; | |
| 1268 x = y; | |
| 1269 } else { | |
| 1270 // Else x is a new node we are keeping | |
| 1271 // We do not need register_new_node_with_optimizer | |
| 1272 // because set_type has already been called. | |
| 1273 igvn->_worklist.push(x); | |
| 1274 } | |
| 1275 } | |
| 1276 } | |
| 1277 if (x != the_clone && the_clone != NULL) | |
| 1278 igvn->remove_dead_node(the_clone); | |
| 1279 phi->set_req(i, x); | |
| 1280 } | |
| 1281 if( wins > 0 ) { | |
| 1282 // Record Phi | |
| 1283 igvn->register_new_node_with_optimizer(phi); | |
| 1284 return phi; | |
| 1285 } | |
| 1286 igvn->remove_dead_node(phi); | |
| 1287 return NULL; | |
| 1288 } | |
|
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1289 |
| 0 | 1290 //------------------------------Ideal------------------------------------------ |
| 1291 // If the load is from Field memory and the pointer is non-null, we can | |
| 1292 // zero out the control input. | |
| 1293 // If the offset is constant and the base is an object allocation, | |
| 1294 // try to hook me up to the exact initializing store. | |
| 1295 Node *LoadNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1296 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
| 1297 if (p) return (p == NodeSentinel) ? NULL : p; | |
| 1298 | |
| 1299 Node* ctrl = in(MemNode::Control); | |
| 1300 Node* address = in(MemNode::Address); | |
| 1301 | |
| 1302 // Skip up past a SafePoint control. Cannot do this for Stores because | |
| 1303 // pointer stores & cardmarks must stay on the same side of a SafePoint. | |
| 1304 if( ctrl != NULL && ctrl->Opcode() == Op_SafePoint && | |
| 1305 phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw ) { | |
| 1306 ctrl = ctrl->in(0); | |
| 1307 set_req(MemNode::Control,ctrl); | |
| 1308 } | |
| 1309 | |
| 1310 // Check for useless control edge in some common special cases | |
| 1311 if (in(MemNode::Control) != NULL) { | |
| 1312 intptr_t ignore = 0; | |
| 1313 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); | |
| 1314 if (base != NULL | |
| 1315 && phase->type(base)->higher_equal(TypePtr::NOTNULL) | |
|
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1316 && phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw |
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1317 && all_controls_dominate(base, phase->C->start())) { |
| 0 | 1318 // A method-invariant, non-null address (constant or 'this' argument). |
| 1319 set_req(MemNode::Control, NULL); | |
| 1320 } | |
| 1321 } | |
| 1322 | |
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1323 if (EliminateAutoBox && can_reshape && in(Address)->is_AddP()) { |
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1324 Node* base = in(Address)->in(AddPNode::Base); |
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1325 if (base != NULL) { |
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1326 Compile::AliasType* atp = phase->C->alias_type(adr_type()); |
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1327 if (is_autobox_object(atp)) { |
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1328 Node* result = eliminate_autobox(phase); |
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1329 if (result != NULL) return result; |
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1330 } |
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1331 } |
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1332 } |
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1333 |
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1334 Node* mem = in(MemNode::Memory); |
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1335 const TypePtr *addr_t = phase->type(address)->isa_ptr(); |
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1336 |
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1337 if (addr_t != NULL) { |
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1338 // try to optimize our memory input |
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1339 Node* opt_mem = MemNode::optimize_memory_chain(mem, addr_t, phase); |
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1340 if (opt_mem != mem) { |
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1341 set_req(MemNode::Memory, opt_mem); |
| 305 | 1342 if (phase->type( opt_mem ) == Type::TOP) return NULL; |
|
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1343 return this; |
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1344 } |
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1345 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); |
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1346 if (can_reshape && opt_mem->is_Phi() && |
| 223 | 1347 (t_oop != NULL) && t_oop->is_known_instance_field()) { |
| 163 | 1348 // Split instance field load through Phi. |
| 1349 Node* result = split_through_phi(phase); | |
| 1350 if (result != NULL) return result; | |
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1351 } |
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1352 } |
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1353 |
| 0 | 1354 // Check for prior store with a different base or offset; make Load |
| 1355 // independent. Skip through any number of them. Bail out if the stores | |
| 1356 // are in an endless dead cycle and report no progress. This is a key | |
| 1357 // transform for Reflection. However, if after skipping through the Stores | |
| 1358 // we can't then fold up against a prior store do NOT do the transform as | |
| 1359 // this amounts to using the 'Oracle' model of aliasing. It leaves the same | |
| 1360 // array memory alive twice: once for the hoisted Load and again after the | |
| 1361 // bypassed Store. This situation only works if EVERYBODY who does | |
| 1362 // anti-dependence work knows how to bypass. I.e. we need all | |
| 1363 // anti-dependence checks to ask the same Oracle. Right now, that Oracle is | |
| 1364 // the alias index stuff. So instead, peek through Stores and IFF we can | |
| 1365 // fold up, do so. | |
| 1366 Node* prev_mem = find_previous_store(phase); | |
| 1367 // Steps (a), (b): Walk past independent stores to find an exact match. | |
| 1368 if (prev_mem != NULL && prev_mem != in(MemNode::Memory)) { | |
| 1369 // (c) See if we can fold up on the spot, but don't fold up here. | |
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1370 // Fold-up might require truncation (for LoadB/LoadS/LoadUS) or |
| 0 | 1371 // just return a prior value, which is done by Identity calls. |
| 1372 if (can_see_stored_value(prev_mem, phase)) { | |
| 1373 // Make ready for step (d): | |
| 1374 set_req(MemNode::Memory, prev_mem); | |
| 1375 return this; | |
| 1376 } | |
| 1377 } | |
| 1378 | |
| 1379 return NULL; // No further progress | |
| 1380 } | |
| 1381 | |
| 1382 // Helper to recognize certain Klass fields which are invariant across | |
| 1383 // some group of array types (e.g., int[] or all T[] where T < Object). | |
| 1384 const Type* | |
| 1385 LoadNode::load_array_final_field(const TypeKlassPtr *tkls, | |
| 1386 ciKlass* klass) const { | |
| 1387 if (tkls->offset() == Klass::modifier_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
| 1388 // The field is Klass::_modifier_flags. Return its (constant) value. | |
| 1389 // (Folds up the 2nd indirection in aClassConstant.getModifiers().) | |
| 1390 assert(this->Opcode() == Op_LoadI, "must load an int from _modifier_flags"); | |
| 1391 return TypeInt::make(klass->modifier_flags()); | |
| 1392 } | |
| 1393 if (tkls->offset() == Klass::access_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
| 1394 // The field is Klass::_access_flags. Return its (constant) value. | |
| 1395 // (Folds up the 2nd indirection in Reflection.getClassAccessFlags(aClassConstant).) | |
| 1396 assert(this->Opcode() == Op_LoadI, "must load an int from _access_flags"); | |
| 1397 return TypeInt::make(klass->access_flags()); | |
| 1398 } | |
| 1399 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
| 1400 // The field is Klass::_layout_helper. Return its constant value if known. | |
| 1401 assert(this->Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
| 1402 return TypeInt::make(klass->layout_helper()); | |
| 1403 } | |
| 1404 | |
| 1405 // No match. | |
| 1406 return NULL; | |
| 1407 } | |
| 1408 | |
| 1409 //------------------------------Value----------------------------------------- | |
| 1410 const Type *LoadNode::Value( PhaseTransform *phase ) const { | |
| 1411 // Either input is TOP ==> the result is TOP | |
| 1412 Node* mem = in(MemNode::Memory); | |
| 1413 const Type *t1 = phase->type(mem); | |
| 1414 if (t1 == Type::TOP) return Type::TOP; | |
| 1415 Node* adr = in(MemNode::Address); | |
| 1416 const TypePtr* tp = phase->type(adr)->isa_ptr(); | |
| 1417 if (tp == NULL || tp->empty()) return Type::TOP; | |
| 1418 int off = tp->offset(); | |
| 1419 assert(off != Type::OffsetTop, "case covered by TypePtr::empty"); | |
| 1420 | |
| 1421 // Try to guess loaded type from pointer type | |
| 1422 if (tp->base() == Type::AryPtr) { | |
| 1423 const Type *t = tp->is_aryptr()->elem(); | |
| 1424 // Don't do this for integer types. There is only potential profit if | |
| 1425 // the element type t is lower than _type; that is, for int types, if _type is | |
| 1426 // more restrictive than t. This only happens here if one is short and the other | |
| 1427 // char (both 16 bits), and in those cases we've made an intentional decision | |
| 1428 // to use one kind of load over the other. See AndINode::Ideal and 4965907. | |
| 1429 // Also, do not try to narrow the type for a LoadKlass, regardless of offset. | |
| 1430 // | |
| 1431 // Yes, it is possible to encounter an expression like (LoadKlass p1:(AddP x x 8)) | |
| 1432 // where the _gvn.type of the AddP is wider than 8. This occurs when an earlier | |
| 1433 // copy p0 of (AddP x x 8) has been proven equal to p1, and the p0 has been | |
| 1434 // subsumed by p1. If p1 is on the worklist but has not yet been re-transformed, | |
| 1435 // it is possible that p1 will have a type like Foo*[int+]:NotNull*+any. | |
| 1436 // In fact, that could have been the original type of p1, and p1 could have | |
| 1437 // had an original form like p1:(AddP x x (LShiftL quux 3)), where the | |
| 1438 // expression (LShiftL quux 3) independently optimized to the constant 8. | |
| 1439 if ((t->isa_int() == NULL) && (t->isa_long() == NULL) | |
|
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1440 && Opcode() != Op_LoadKlass && Opcode() != Op_LoadNKlass) { |
| 0 | 1441 // t might actually be lower than _type, if _type is a unique |
| 1442 // concrete subclass of abstract class t. | |
| 1443 // Make sure the reference is not into the header, by comparing | |
| 1444 // the offset against the offset of the start of the array's data. | |
| 1445 // Different array types begin at slightly different offsets (12 vs. 16). | |
| 1446 // We choose T_BYTE as an example base type that is least restrictive | |
| 1447 // as to alignment, which will therefore produce the smallest | |
| 1448 // possible base offset. | |
| 1449 const int min_base_off = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
| 1450 if ((uint)off >= (uint)min_base_off) { // is the offset beyond the header? | |
| 1451 const Type* jt = t->join(_type); | |
| 1452 // In any case, do not allow the join, per se, to empty out the type. | |
| 1453 if (jt->empty() && !t->empty()) { | |
| 1454 // This can happen if a interface-typed array narrows to a class type. | |
| 1455 jt = _type; | |
| 1456 } | |
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1457 |
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1458 if (EliminateAutoBox) { |
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1459 // The pointers in the autobox arrays are always non-null |
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1460 Node* base = in(Address)->in(AddPNode::Base); |
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1461 if (base != NULL) { |
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1462 Compile::AliasType* atp = phase->C->alias_type(base->adr_type()); |
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1463 if (is_autobox_cache(atp)) { |
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1464 return jt->join(TypePtr::NOTNULL)->is_ptr(); |
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1465 } |
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1466 } |
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1467 } |
| 0 | 1468 return jt; |
| 1469 } | |
| 1470 } | |
| 1471 } else if (tp->base() == Type::InstPtr) { | |
| 1472 assert( off != Type::OffsetBot || | |
| 1473 // arrays can be cast to Objects | |
| 1474 tp->is_oopptr()->klass()->is_java_lang_Object() || | |
| 1475 // unsafe field access may not have a constant offset | |
| 1476 phase->C->has_unsafe_access(), | |
| 1477 "Field accesses must be precise" ); | |
| 1478 // For oop loads, we expect the _type to be precise | |
| 1479 } else if (tp->base() == Type::KlassPtr) { | |
| 1480 assert( off != Type::OffsetBot || | |
| 1481 // arrays can be cast to Objects | |
| 1482 tp->is_klassptr()->klass()->is_java_lang_Object() || | |
| 1483 // also allow array-loading from the primary supertype | |
| 1484 // array during subtype checks | |
| 1485 Opcode() == Op_LoadKlass, | |
| 1486 "Field accesses must be precise" ); | |
| 1487 // For klass/static loads, we expect the _type to be precise | |
| 1488 } | |
| 1489 | |
| 1490 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
| 1491 if (tkls != NULL && !StressReflectiveCode) { | |
| 1492 ciKlass* klass = tkls->klass(); | |
| 1493 if (klass->is_loaded() && tkls->klass_is_exact()) { | |
| 1494 // We are loading a field from a Klass metaobject whose identity | |
| 1495 // is known at compile time (the type is "exact" or "precise"). | |
| 1496 // Check for fields we know are maintained as constants by the VM. | |
| 1497 if (tkls->offset() == Klass::super_check_offset_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
| 1498 // The field is Klass::_super_check_offset. Return its (constant) value. | |
| 1499 // (Folds up type checking code.) | |
| 1500 assert(Opcode() == Op_LoadI, "must load an int from _super_check_offset"); | |
| 1501 return TypeInt::make(klass->super_check_offset()); | |
| 1502 } | |
| 1503 // Compute index into primary_supers array | |
| 1504 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
| 1505 // Check for overflowing; use unsigned compare to handle the negative case. | |
| 1506 if( depth < ciKlass::primary_super_limit() ) { | |
| 1507 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
| 1508 // (Folds up type checking code.) | |
| 1509 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
| 1510 ciKlass *ss = klass->super_of_depth(depth); | |
| 1511 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
| 1512 } | |
| 1513 const Type* aift = load_array_final_field(tkls, klass); | |
| 1514 if (aift != NULL) return aift; | |
| 1515 if (tkls->offset() == in_bytes(arrayKlass::component_mirror_offset()) + (int)sizeof(oopDesc) | |
| 1516 && klass->is_array_klass()) { | |
| 1517 // The field is arrayKlass::_component_mirror. Return its (constant) value. | |
| 1518 // (Folds up aClassConstant.getComponentType, common in Arrays.copyOf.) | |
| 1519 assert(Opcode() == Op_LoadP, "must load an oop from _component_mirror"); | |
| 1520 return TypeInstPtr::make(klass->as_array_klass()->component_mirror()); | |
| 1521 } | |
| 1522 if (tkls->offset() == Klass::java_mirror_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
| 1523 // The field is Klass::_java_mirror. Return its (constant) value. | |
| 1524 // (Folds up the 2nd indirection in anObjConstant.getClass().) | |
| 1525 assert(Opcode() == Op_LoadP, "must load an oop from _java_mirror"); | |
| 1526 return TypeInstPtr::make(klass->java_mirror()); | |
| 1527 } | |
| 1528 } | |
| 1529 | |
| 1530 // We can still check if we are loading from the primary_supers array at a | |
| 1531 // shallow enough depth. Even though the klass is not exact, entries less | |
| 1532 // than or equal to its super depth are correct. | |
| 1533 if (klass->is_loaded() ) { | |
| 1534 ciType *inner = klass->klass(); | |
| 1535 while( inner->is_obj_array_klass() ) | |
| 1536 inner = inner->as_obj_array_klass()->base_element_type(); | |
| 1537 if( inner->is_instance_klass() && | |
| 1538 !inner->as_instance_klass()->flags().is_interface() ) { | |
| 1539 // Compute index into primary_supers array | |
| 1540 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
| 1541 // Check for overflowing; use unsigned compare to handle the negative case. | |
| 1542 if( depth < ciKlass::primary_super_limit() && | |
| 1543 depth <= klass->super_depth() ) { // allow self-depth checks to handle self-check case | |
| 1544 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
| 1545 // (Folds up type checking code.) | |
| 1546 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
| 1547 ciKlass *ss = klass->super_of_depth(depth); | |
| 1548 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
| 1549 } | |
| 1550 } | |
| 1551 } | |
| 1552 | |
| 1553 // If the type is enough to determine that the thing is not an array, | |
| 1554 // we can give the layout_helper a positive interval type. | |
| 1555 // This will help short-circuit some reflective code. | |
| 1556 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc) | |
| 1557 && !klass->is_array_klass() // not directly typed as an array | |
| 1558 && !klass->is_interface() // specifically not Serializable & Cloneable | |
| 1559 && !klass->is_java_lang_Object() // not the supertype of all T[] | |
| 1560 ) { | |
| 1561 // Note: When interfaces are reliable, we can narrow the interface | |
| 1562 // test to (klass != Serializable && klass != Cloneable). | |
| 1563 assert(Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
| 1564 jint min_size = Klass::instance_layout_helper(oopDesc::header_size(), false); | |
| 1565 // The key property of this type is that it folds up tests | |
| 1566 // for array-ness, since it proves that the layout_helper is positive. | |
| 1567 // Thus, a generic value like the basic object layout helper works fine. | |
| 1568 return TypeInt::make(min_size, max_jint, Type::WidenMin); | |
| 1569 } | |
| 1570 } | |
| 1571 | |
| 1572 // If we are loading from a freshly-allocated object, produce a zero, | |
| 1573 // if the load is provably beyond the header of the object. | |
| 1574 // (Also allow a variable load from a fresh array to produce zero.) | |
| 1575 if (ReduceFieldZeroing) { | |
| 1576 Node* value = can_see_stored_value(mem,phase); | |
| 1577 if (value != NULL && value->is_Con()) | |
| 1578 return value->bottom_type(); | |
| 1579 } | |
| 1580 | |
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1581 const TypeOopPtr *tinst = tp->isa_oopptr(); |
| 223 | 1582 if (tinst != NULL && tinst->is_known_instance_field()) { |
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1583 // If we have an instance type and our memory input is the |
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1584 // programs's initial memory state, there is no matching store, |
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1585 // so just return a zero of the appropriate type |
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1586 Node *mem = in(MemNode::Memory); |
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1587 if (mem->is_Parm() && mem->in(0)->is_Start()) { |
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1588 assert(mem->as_Parm()->_con == TypeFunc::Memory, "must be memory Parm"); |
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1589 return Type::get_zero_type(_type->basic_type()); |
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1590 } |
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1591 } |
| 0 | 1592 return _type; |
| 1593 } | |
| 1594 | |
| 1595 //------------------------------match_edge------------------------------------- | |
| 1596 // Do we Match on this edge index or not? Match only the address. | |
| 1597 uint LoadNode::match_edge(uint idx) const { | |
| 1598 return idx == MemNode::Address; | |
| 1599 } | |
| 1600 | |
| 1601 //--------------------------LoadBNode::Ideal-------------------------------------- | |
| 1602 // | |
| 1603 // If the previous store is to the same address as this load, | |
| 1604 // and the value stored was larger than a byte, replace this load | |
| 1605 // with the value stored truncated to a byte. If no truncation is | |
| 1606 // needed, the replacement is done in LoadNode::Identity(). | |
| 1607 // | |
| 1608 Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1609 Node* mem = in(MemNode::Memory); | |
| 1610 Node* value = can_see_stored_value(mem,phase); | |
| 1611 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
| 1612 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(24)) ); | |
| 1613 return new (phase->C, 3) RShiftINode(result, phase->intcon(24)); | |
| 1614 } | |
| 1615 // Identity call will handle the case where truncation is not needed. | |
| 1616 return LoadNode::Ideal(phase, can_reshape); | |
| 1617 } | |
| 1618 | |
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1619 //--------------------------LoadUSNode::Ideal------------------------------------- |
| 0 | 1620 // |
| 1621 // If the previous store is to the same address as this load, | |
| 1622 // and the value stored was larger than a char, replace this load | |
| 1623 // with the value stored truncated to a char. If no truncation is | |
| 1624 // needed, the replacement is done in LoadNode::Identity(). | |
| 1625 // | |
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1626 Node *LoadUSNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
| 0 | 1627 Node* mem = in(MemNode::Memory); |
| 1628 Node* value = can_see_stored_value(mem,phase); | |
| 1629 if( value && !phase->type(value)->higher_equal( _type ) ) | |
| 1630 return new (phase->C, 3) AndINode(value,phase->intcon(0xFFFF)); | |
| 1631 // Identity call will handle the case where truncation is not needed. | |
| 1632 return LoadNode::Ideal(phase, can_reshape); | |
| 1633 } | |
| 1634 | |
| 1635 //--------------------------LoadSNode::Ideal-------------------------------------- | |
| 1636 // | |
| 1637 // If the previous store is to the same address as this load, | |
| 1638 // and the value stored was larger than a short, replace this load | |
| 1639 // with the value stored truncated to a short. If no truncation is | |
| 1640 // needed, the replacement is done in LoadNode::Identity(). | |
| 1641 // | |
| 1642 Node *LoadSNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1643 Node* mem = in(MemNode::Memory); | |
| 1644 Node* value = can_see_stored_value(mem,phase); | |
| 1645 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
| 1646 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(16)) ); | |
| 1647 return new (phase->C, 3) RShiftINode(result, phase->intcon(16)); | |
| 1648 } | |
| 1649 // Identity call will handle the case where truncation is not needed. | |
| 1650 return LoadNode::Ideal(phase, can_reshape); | |
| 1651 } | |
| 1652 | |
| 1653 //============================================================================= | |
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1654 //----------------------------LoadKlassNode::make------------------------------ |
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1655 // Polymorphic factory method: |
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1656 Node *LoadKlassNode::make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, const TypeKlassPtr *tk ) { |
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1657 Compile* C = gvn.C; |
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1658 Node *ctl = NULL; |
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1659 // sanity check the alias category against the created node type |
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1660 const TypeOopPtr *adr_type = adr->bottom_type()->isa_oopptr(); |
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1661 assert(adr_type != NULL, "expecting TypeOopPtr"); |
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1662 #ifdef _LP64 |
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1663 if (adr_type->is_ptr_to_narrowoop()) { |
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1664 Node* load_klass = gvn.transform(new (C, 3) LoadNKlassNode(ctl, mem, adr, at, tk->make_narrowoop())); |
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1665 return new (C, 2) DecodeNNode(load_klass, load_klass->bottom_type()->make_ptr()); |
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1666 } |
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1667 #endif |
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1668 assert(!adr_type->is_ptr_to_narrowoop(), "should have got back a narrow oop"); |
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1669 return new (C, 3) LoadKlassNode(ctl, mem, adr, at, tk); |
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1670 } |
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1671 |
| 0 | 1672 //------------------------------Value------------------------------------------ |
| 1673 const Type *LoadKlassNode::Value( PhaseTransform *phase ) const { | |
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1674 return klass_value_common(phase); |
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1675 } |
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1676 |
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1677 const Type *LoadNode::klass_value_common( PhaseTransform *phase ) const { |
| 0 | 1678 // Either input is TOP ==> the result is TOP |
| 1679 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
| 1680 if (t1 == Type::TOP) return Type::TOP; | |
| 1681 Node *adr = in(MemNode::Address); | |
| 1682 const Type *t2 = phase->type( adr ); | |
| 1683 if (t2 == Type::TOP) return Type::TOP; | |
| 1684 const TypePtr *tp = t2->is_ptr(); | |
| 1685 if (TypePtr::above_centerline(tp->ptr()) || | |
| 1686 tp->ptr() == TypePtr::Null) return Type::TOP; | |
| 1687 | |
| 1688 // Return a more precise klass, if possible | |
| 1689 const TypeInstPtr *tinst = tp->isa_instptr(); | |
| 1690 if (tinst != NULL) { | |
| 1691 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
| 1692 int offset = tinst->offset(); | |
| 1693 if (ik == phase->C->env()->Class_klass() | |
| 1694 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
| 1695 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
| 1696 // We are loading a special hidden field from a Class mirror object, | |
| 1697 // the field which points to the VM's Klass metaobject. | |
| 1698 ciType* t = tinst->java_mirror_type(); | |
| 1699 // java_mirror_type returns non-null for compile-time Class constants. | |
| 1700 if (t != NULL) { | |
| 1701 // constant oop => constant klass | |
| 1702 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
| 1703 return TypeKlassPtr::make(ciArrayKlass::make(t)); | |
| 1704 } | |
| 1705 if (!t->is_klass()) { | |
| 1706 // a primitive Class (e.g., int.class) has NULL for a klass field | |
| 1707 return TypePtr::NULL_PTR; | |
| 1708 } | |
| 1709 // (Folds up the 1st indirection in aClassConstant.getModifiers().) | |
| 1710 return TypeKlassPtr::make(t->as_klass()); | |
| 1711 } | |
| 1712 // non-constant mirror, so we can't tell what's going on | |
| 1713 } | |
| 1714 if( !ik->is_loaded() ) | |
| 1715 return _type; // Bail out if not loaded | |
| 1716 if (offset == oopDesc::klass_offset_in_bytes()) { | |
| 1717 if (tinst->klass_is_exact()) { | |
| 1718 return TypeKlassPtr::make(ik); | |
| 1719 } | |
| 1720 // See if we can become precise: no subklasses and no interface | |
| 1721 // (Note: We need to support verified interfaces.) | |
| 1722 if (!ik->is_interface() && !ik->has_subklass()) { | |
| 1723 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
| 1724 // Add a dependence; if any subclass added we need to recompile | |
| 1725 if (!ik->is_final()) { | |
| 1726 // %%% should use stronger assert_unique_concrete_subtype instead | |
| 1727 phase->C->dependencies()->assert_leaf_type(ik); | |
| 1728 } | |
| 1729 // Return precise klass | |
| 1730 return TypeKlassPtr::make(ik); | |
| 1731 } | |
| 1732 | |
| 1733 // Return root of possible klass | |
| 1734 return TypeKlassPtr::make(TypePtr::NotNull, ik, 0/*offset*/); | |
| 1735 } | |
| 1736 } | |
| 1737 | |
| 1738 // Check for loading klass from an array | |
| 1739 const TypeAryPtr *tary = tp->isa_aryptr(); | |
| 1740 if( tary != NULL ) { | |
| 1741 ciKlass *tary_klass = tary->klass(); | |
| 1742 if (tary_klass != NULL // can be NULL when at BOTTOM or TOP | |
| 1743 && tary->offset() == oopDesc::klass_offset_in_bytes()) { | |
| 1744 if (tary->klass_is_exact()) { | |
| 1745 return TypeKlassPtr::make(tary_klass); | |
| 1746 } | |
| 1747 ciArrayKlass *ak = tary->klass()->as_array_klass(); | |
| 1748 // If the klass is an object array, we defer the question to the | |
| 1749 // array component klass. | |
| 1750 if( ak->is_obj_array_klass() ) { | |
| 1751 assert( ak->is_loaded(), "" ); | |
| 1752 ciKlass *base_k = ak->as_obj_array_klass()->base_element_klass(); | |
| 1753 if( base_k->is_loaded() && base_k->is_instance_klass() ) { | |
| 1754 ciInstanceKlass* ik = base_k->as_instance_klass(); | |
| 1755 // See if we can become precise: no subklasses and no interface | |
| 1756 if (!ik->is_interface() && !ik->has_subklass()) { | |
| 1757 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
| 1758 // Add a dependence; if any subclass added we need to recompile | |
| 1759 if (!ik->is_final()) { | |
| 1760 phase->C->dependencies()->assert_leaf_type(ik); | |
| 1761 } | |
| 1762 // Return precise array klass | |
| 1763 return TypeKlassPtr::make(ak); | |
| 1764 } | |
| 1765 } | |
| 1766 return TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
| 1767 } else { // Found a type-array? | |
| 1768 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
| 1769 assert( ak->is_type_array_klass(), "" ); | |
| 1770 return TypeKlassPtr::make(ak); // These are always precise | |
| 1771 } | |
| 1772 } | |
| 1773 } | |
| 1774 | |
| 1775 // Check for loading klass from an array klass | |
| 1776 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
| 1777 if (tkls != NULL && !StressReflectiveCode) { | |
| 1778 ciKlass* klass = tkls->klass(); | |
| 1779 if( !klass->is_loaded() ) | |
| 1780 return _type; // Bail out if not loaded | |
| 1781 if( klass->is_obj_array_klass() && | |
| 1782 (uint)tkls->offset() == objArrayKlass::element_klass_offset_in_bytes() + sizeof(oopDesc)) { | |
| 1783 ciKlass* elem = klass->as_obj_array_klass()->element_klass(); | |
| 1784 // // Always returning precise element type is incorrect, | |
| 1785 // // e.g., element type could be object and array may contain strings | |
| 1786 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0); | |
| 1787 | |
| 1788 // The array's TypeKlassPtr was declared 'precise' or 'not precise' | |
| 1789 // according to the element type's subclassing. | |
| 1790 return TypeKlassPtr::make(tkls->ptr(), elem, 0/*offset*/); | |
| 1791 } | |
| 1792 if( klass->is_instance_klass() && tkls->klass_is_exact() && | |
| 1793 (uint)tkls->offset() == Klass::super_offset_in_bytes() + sizeof(oopDesc)) { | |
| 1794 ciKlass* sup = klass->as_instance_klass()->super(); | |
| 1795 // The field is Klass::_super. Return its (constant) value. | |
| 1796 // (Folds up the 2nd indirection in aClassConstant.getSuperClass().) | |
| 1797 return sup ? TypeKlassPtr::make(sup) : TypePtr::NULL_PTR; | |
| 1798 } | |
| 1799 } | |
| 1800 | |
| 1801 // Bailout case | |
| 1802 return LoadNode::Value(phase); | |
| 1803 } | |
| 1804 | |
| 1805 //------------------------------Identity--------------------------------------- | |
| 1806 // To clean up reflective code, simplify k.java_mirror.as_klass to plain k. | |
| 1807 // Also feed through the klass in Allocate(...klass...)._klass. | |
| 1808 Node* LoadKlassNode::Identity( PhaseTransform *phase ) { | |
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1809 return klass_identity_common(phase); |
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1810 } |
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1811 |
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1812 Node* LoadNode::klass_identity_common(PhaseTransform *phase ) { |
| 0 | 1813 Node* x = LoadNode::Identity(phase); |
| 1814 if (x != this) return x; | |
| 1815 | |
| 1816 // Take apart the address into an oop and and offset. | |
| 1817 // Return 'this' if we cannot. | |
| 1818 Node* adr = in(MemNode::Address); | |
| 1819 intptr_t offset = 0; | |
| 1820 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
| 1821 if (base == NULL) return this; | |
| 1822 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr(); | |
| 1823 if (toop == NULL) return this; | |
| 1824 | |
| 1825 // We can fetch the klass directly through an AllocateNode. | |
| 1826 // This works even if the klass is not constant (clone or newArray). | |
| 1827 if (offset == oopDesc::klass_offset_in_bytes()) { | |
| 1828 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase); | |
| 1829 if (allocated_klass != NULL) { | |
| 1830 return allocated_klass; | |
| 1831 } | |
| 1832 } | |
| 1833 | |
| 1834 // Simplify k.java_mirror.as_klass to plain k, where k is a klassOop. | |
| 1835 // Simplify ak.component_mirror.array_klass to plain ak, ak an arrayKlass. | |
| 1836 // See inline_native_Class_query for occurrences of these patterns. | |
| 1837 // Java Example: x.getClass().isAssignableFrom(y) | |
| 1838 // Java Example: Array.newInstance(x.getClass().getComponentType(), n) | |
| 1839 // | |
| 1840 // This improves reflective code, often making the Class | |
| 1841 // mirror go completely dead. (Current exception: Class | |
| 1842 // mirrors may appear in debug info, but we could clean them out by | |
| 1843 // introducing a new debug info operator for klassOop.java_mirror). | |
| 1844 if (toop->isa_instptr() && toop->klass() == phase->C->env()->Class_klass() | |
| 1845 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
| 1846 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
| 1847 // We are loading a special hidden field from a Class mirror, | |
| 1848 // the field which points to its Klass or arrayKlass metaobject. | |
| 1849 if (base->is_Load()) { | |
| 1850 Node* adr2 = base->in(MemNode::Address); | |
| 1851 const TypeKlassPtr* tkls = phase->type(adr2)->isa_klassptr(); | |
| 1852 if (tkls != NULL && !tkls->empty() | |
| 1853 && (tkls->klass()->is_instance_klass() || | |
| 1854 tkls->klass()->is_array_klass()) | |
| 1855 && adr2->is_AddP() | |
| 1856 ) { | |
| 1857 int mirror_field = Klass::java_mirror_offset_in_bytes(); | |
| 1858 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
| 1859 mirror_field = in_bytes(arrayKlass::component_mirror_offset()); | |
| 1860 } | |
| 1861 if (tkls->offset() == mirror_field + (int)sizeof(oopDesc)) { | |
| 1862 return adr2->in(AddPNode::Base); | |
| 1863 } | |
| 1864 } | |
| 1865 } | |
| 1866 } | |
| 1867 | |
| 1868 return this; | |
| 1869 } | |
| 1870 | |
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1872 //------------------------------Value------------------------------------------ |
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1873 const Type *LoadNKlassNode::Value( PhaseTransform *phase ) const { |
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1874 const Type *t = klass_value_common(phase); |
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1875 if (t == Type::TOP) |
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1876 return t; |
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1877 |
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1878 return t->make_narrowoop(); |
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1879 } |
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1880 |
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1881 //------------------------------Identity--------------------------------------- |
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1882 // To clean up reflective code, simplify k.java_mirror.as_klass to narrow k. |
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1883 // Also feed through the klass in Allocate(...klass...)._klass. |
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1884 Node* LoadNKlassNode::Identity( PhaseTransform *phase ) { |
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1885 Node *x = klass_identity_common(phase); |
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1886 |
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1887 const Type *t = phase->type( x ); |
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1888 if( t == Type::TOP ) return x; |
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1889 if( t->isa_narrowoop()) return x; |
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1890 |
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1891 return phase->transform(new (phase->C, 2) EncodePNode(x, t->make_narrowoop())); |
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1892 } |
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1893 |
| 0 | 1894 //------------------------------Value----------------------------------------- |
| 1895 const Type *LoadRangeNode::Value( PhaseTransform *phase ) const { | |
| 1896 // Either input is TOP ==> the result is TOP | |
| 1897 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
| 1898 if( t1 == Type::TOP ) return Type::TOP; | |
| 1899 Node *adr = in(MemNode::Address); | |
| 1900 const Type *t2 = phase->type( adr ); | |
| 1901 if( t2 == Type::TOP ) return Type::TOP; | |
| 1902 const TypePtr *tp = t2->is_ptr(); | |
| 1903 if (TypePtr::above_centerline(tp->ptr())) return Type::TOP; | |
| 1904 const TypeAryPtr *tap = tp->isa_aryptr(); | |
| 1905 if( !tap ) return _type; | |
| 1906 return tap->size(); | |
| 1907 } | |
| 1908 | |
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1909 //-------------------------------Ideal--------------------------------------- |
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1910 // Feed through the length in AllocateArray(...length...)._length. |
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1911 Node *LoadRangeNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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1912 Node* p = MemNode::Ideal_common(phase, can_reshape); |
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1913 if (p) return (p == NodeSentinel) ? NULL : p; |
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1914 |
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1915 // Take apart the address into an oop and and offset. |
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1916 // Return 'this' if we cannot. |
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1917 Node* adr = in(MemNode::Address); |
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1918 intptr_t offset = 0; |
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1919 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); |
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1920 if (base == NULL) return NULL; |
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1921 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); |
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1922 if (tary == NULL) return NULL; |
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1923 |
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1924 // We can fetch the length directly through an AllocateArrayNode. |
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1925 // This works even if the length is not constant (clone or newArray). |
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1926 if (offset == arrayOopDesc::length_offset_in_bytes()) { |
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1927 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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1928 if (alloc != NULL) { |
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1929 Node* allocated_length = alloc->Ideal_length(); |
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1930 Node* len = alloc->make_ideal_length(tary, phase); |
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1931 if (allocated_length != len) { |
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1932 // New CastII improves on this. |
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1933 return len; |
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1934 } |
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1935 } |
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1936 } |
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1937 |
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1938 return NULL; |
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1939 } |
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1940 |
| 0 | 1941 //------------------------------Identity--------------------------------------- |
| 1942 // Feed through the length in AllocateArray(...length...)._length. | |
| 1943 Node* LoadRangeNode::Identity( PhaseTransform *phase ) { | |
| 1944 Node* x = LoadINode::Identity(phase); | |
| 1945 if (x != this) return x; | |
| 1946 | |
| 1947 // Take apart the address into an oop and and offset. | |
| 1948 // Return 'this' if we cannot. | |
| 1949 Node* adr = in(MemNode::Address); | |
| 1950 intptr_t offset = 0; | |
| 1951 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
| 1952 if (base == NULL) return this; | |
| 1953 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); | |
| 1954 if (tary == NULL) return this; | |
| 1955 | |
| 1956 // We can fetch the length directly through an AllocateArrayNode. | |
| 1957 // This works even if the length is not constant (clone or newArray). | |
| 1958 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
|
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1959 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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1960 if (alloc != NULL) { |
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1961 Node* allocated_length = alloc->Ideal_length(); |
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1962 // Do not allow make_ideal_length to allocate a CastII node. |
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1963 Node* len = alloc->make_ideal_length(tary, phase, false); |
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1964 if (allocated_length == len) { |
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1965 // Return allocated_length only if it would not be improved by a CastII. |
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1966 return allocated_length; |
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1967 } |
| 0 | 1968 } |
| 1969 } | |
| 1970 | |
| 1971 return this; | |
| 1972 | |
| 1973 } | |
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1974 |
| 0 | 1975 //============================================================================= |
| 1976 //---------------------------StoreNode::make----------------------------------- | |
| 1977 // Polymorphic factory method: | |
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1978 StoreNode* StoreNode::make( PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, BasicType bt ) { |
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1979 Compile* C = gvn.C; |
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1980 |
| 0 | 1981 switch (bt) { |
| 1982 case T_BOOLEAN: | |
| 1983 case T_BYTE: return new (C, 4) StoreBNode(ctl, mem, adr, adr_type, val); | |
| 1984 case T_INT: return new (C, 4) StoreINode(ctl, mem, adr, adr_type, val); | |
| 1985 case T_CHAR: | |
| 1986 case T_SHORT: return new (C, 4) StoreCNode(ctl, mem, adr, adr_type, val); | |
| 1987 case T_LONG: return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val); | |
| 1988 case T_FLOAT: return new (C, 4) StoreFNode(ctl, mem, adr, adr_type, val); | |
| 1989 case T_DOUBLE: return new (C, 4) StoreDNode(ctl, mem, adr, adr_type, val); | |
| 1990 case T_ADDRESS: | |
|
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1991 case T_OBJECT: |
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1992 #ifdef _LP64 |
| 163 | 1993 if (adr->bottom_type()->is_ptr_to_narrowoop() || |
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1994 (UseCompressedOops && val->bottom_type()->isa_klassptr() && |
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1995 adr->bottom_type()->isa_rawptr())) { |
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1996 val = gvn.transform(new (C, 2) EncodePNode(val, val->bottom_type()->make_narrowoop())); |
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1997 return new (C, 4) StoreNNode(ctl, mem, adr, adr_type, val); |
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1998 } else |
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1999 #endif |
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2000 { |
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2001 return new (C, 4) StorePNode(ctl, mem, adr, adr_type, val); |
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2002 } |
| 0 | 2003 } |
| 2004 ShouldNotReachHere(); | |
| 2005 return (StoreNode*)NULL; | |
| 2006 } | |
| 2007 | |
| 2008 StoreLNode* StoreLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val) { | |
| 2009 bool require_atomic = true; | |
| 2010 return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val, require_atomic); | |
| 2011 } | |
| 2012 | |
| 2013 | |
| 2014 //--------------------------bottom_type---------------------------------------- | |
| 2015 const Type *StoreNode::bottom_type() const { | |
| 2016 return Type::MEMORY; | |
| 2017 } | |
| 2018 | |
| 2019 //------------------------------hash------------------------------------------- | |
| 2020 uint StoreNode::hash() const { | |
| 2021 // unroll addition of interesting fields | |
| 2022 //return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address) + (uintptr_t)in(ValueIn); | |
| 2023 | |
| 2024 // Since they are not commoned, do not hash them: | |
| 2025 return NO_HASH; | |
| 2026 } | |
| 2027 | |
| 2028 //------------------------------Ideal------------------------------------------ | |
| 2029 // Change back-to-back Store(, p, x) -> Store(m, p, y) to Store(m, p, x). | |
| 2030 // When a store immediately follows a relevant allocation/initialization, | |
| 2031 // try to capture it into the initialization, or hoist it above. | |
| 2032 Node *StoreNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 2033 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
| 2034 if (p) return (p == NodeSentinel) ? NULL : p; | |
| 2035 | |
| 2036 Node* mem = in(MemNode::Memory); | |
| 2037 Node* address = in(MemNode::Address); | |
| 2038 | |
| 2039 // Back-to-back stores to same address? Fold em up. | |
| 2040 // Generally unsafe if I have intervening uses... | |
| 2041 if (mem->is_Store() && phase->eqv_uncast(mem->in(MemNode::Address), address)) { | |
| 2042 // Looking at a dead closed cycle of memory? | |
| 2043 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal"); | |
| 2044 | |
| 2045 assert(Opcode() == mem->Opcode() || | |
| 2046 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw, | |
| 2047 "no mismatched stores, except on raw memory"); | |
| 2048 | |
| 2049 if (mem->outcnt() == 1 && // check for intervening uses | |
| 2050 mem->as_Store()->memory_size() <= this->memory_size()) { | |
| 2051 // If anybody other than 'this' uses 'mem', we cannot fold 'mem' away. | |
| 2052 // For example, 'mem' might be the final state at a conditional return. | |
| 2053 // Or, 'mem' might be used by some node which is live at the same time | |
| 2054 // 'this' is live, which might be unschedulable. So, require exactly | |
| 2055 // ONE user, the 'this' store, until such time as we clone 'mem' for | |
| 2056 // each of 'mem's uses (thus making the exactly-1-user-rule hold true). | |
| 2057 if (can_reshape) { // (%%% is this an anachronism?) | |
| 2058 set_req_X(MemNode::Memory, mem->in(MemNode::Memory), | |
| 2059 phase->is_IterGVN()); | |
| 2060 } else { | |
| 2061 // It's OK to do this in the parser, since DU info is always accurate, | |
| 2062 // and the parser always refers to nodes via SafePointNode maps. | |
| 2063 set_req(MemNode::Memory, mem->in(MemNode::Memory)); | |
| 2064 } | |
| 2065 return this; | |
| 2066 } | |
| 2067 } | |
| 2068 | |
| 2069 // Capture an unaliased, unconditional, simple store into an initializer. | |
| 2070 // Or, if it is independent of the allocation, hoist it above the allocation. | |
| 2071 if (ReduceFieldZeroing && /*can_reshape &&*/ | |
| 2072 mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
| 2073 InitializeNode* init = mem->in(0)->as_Initialize(); | |
| 2074 intptr_t offset = init->can_capture_store(this, phase); | |
| 2075 if (offset > 0) { | |
| 2076 Node* moved = init->capture_store(this, offset, phase); | |
| 2077 // If the InitializeNode captured me, it made a raw copy of me, | |
| 2078 // and I need to disappear. | |
| 2079 if (moved != NULL) { | |
| 2080 // %%% hack to ensure that Ideal returns a new node: | |
| 2081 mem = MergeMemNode::make(phase->C, mem); | |
| 2082 return mem; // fold me away | |
| 2083 } | |
| 2084 } | |
| 2085 } | |
| 2086 | |
| 2087 return NULL; // No further progress | |
| 2088 } | |
| 2089 | |
| 2090 //------------------------------Value----------------------------------------- | |
| 2091 const Type *StoreNode::Value( PhaseTransform *phase ) const { | |
| 2092 // Either input is TOP ==> the result is TOP | |
| 2093 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
| 2094 if( t1 == Type::TOP ) return Type::TOP; | |
| 2095 const Type *t2 = phase->type( in(MemNode::Address) ); | |
| 2096 if( t2 == Type::TOP ) return Type::TOP; | |
| 2097 const Type *t3 = phase->type( in(MemNode::ValueIn) ); | |
| 2098 if( t3 == Type::TOP ) return Type::TOP; | |
| 2099 return Type::MEMORY; | |
| 2100 } | |
| 2101 | |
| 2102 //------------------------------Identity--------------------------------------- | |
| 2103 // Remove redundant stores: | |
| 2104 // Store(m, p, Load(m, p)) changes to m. | |
| 2105 // Store(, p, x) -> Store(m, p, x) changes to Store(m, p, x). | |
| 2106 Node *StoreNode::Identity( PhaseTransform *phase ) { | |
| 2107 Node* mem = in(MemNode::Memory); | |
| 2108 Node* adr = in(MemNode::Address); | |
| 2109 Node* val = in(MemNode::ValueIn); | |
| 2110 | |
| 2111 // Load then Store? Then the Store is useless | |
| 2112 if (val->is_Load() && | |
| 2113 phase->eqv_uncast( val->in(MemNode::Address), adr ) && | |
| 2114 phase->eqv_uncast( val->in(MemNode::Memory ), mem ) && | |
| 2115 val->as_Load()->store_Opcode() == Opcode()) { | |
| 2116 return mem; | |
| 2117 } | |
| 2118 | |
| 2119 // Two stores in a row of the same value? | |
| 2120 if (mem->is_Store() && | |
| 2121 phase->eqv_uncast( mem->in(MemNode::Address), adr ) && | |
| 2122 phase->eqv_uncast( mem->in(MemNode::ValueIn), val ) && | |
| 2123 mem->Opcode() == Opcode()) { | |
| 2124 return mem; | |
| 2125 } | |
| 2126 | |
| 2127 // Store of zero anywhere into a freshly-allocated object? | |
| 2128 // Then the store is useless. | |
| 2129 // (It must already have been captured by the InitializeNode.) | |
| 2130 if (ReduceFieldZeroing && phase->type(val)->is_zero_type()) { | |
| 2131 // a newly allocated object is already all-zeroes everywhere | |
| 2132 if (mem->is_Proj() && mem->in(0)->is_Allocate()) { | |
| 2133 return mem; | |
| 2134 } | |
| 2135 | |
| 2136 // the store may also apply to zero-bits in an earlier object | |
| 2137 Node* prev_mem = find_previous_store(phase); | |
| 2138 // Steps (a), (b): Walk past independent stores to find an exact match. | |
| 2139 if (prev_mem != NULL) { | |
| 2140 Node* prev_val = can_see_stored_value(prev_mem, phase); | |
| 2141 if (prev_val != NULL && phase->eqv(prev_val, val)) { | |
| 2142 // prev_val and val might differ by a cast; it would be good | |
| 2143 // to keep the more informative of the two. | |
| 2144 return mem; | |
| 2145 } | |
| 2146 } | |
| 2147 } | |
| 2148 | |
| 2149 return this; | |
| 2150 } | |
| 2151 | |
| 2152 //------------------------------match_edge------------------------------------- | |
| 2153 // Do we Match on this edge index or not? Match only memory & value | |
| 2154 uint StoreNode::match_edge(uint idx) const { | |
| 2155 return idx == MemNode::Address || idx == MemNode::ValueIn; | |
| 2156 } | |
| 2157 | |
| 2158 //------------------------------cmp-------------------------------------------- | |
| 2159 // Do not common stores up together. They generally have to be split | |
| 2160 // back up anyways, so do not bother. | |
| 2161 uint StoreNode::cmp( const Node &n ) const { | |
| 2162 return (&n == this); // Always fail except on self | |
| 2163 } | |
| 2164 | |
| 2165 //------------------------------Ideal_masked_input----------------------------- | |
| 2166 // Check for a useless mask before a partial-word store | |
| 2167 // (StoreB ... (AndI valIn conIa) ) | |
| 2168 // If (conIa & mask == mask) this simplifies to | |
| 2169 // (StoreB ... (valIn) ) | |
| 2170 Node *StoreNode::Ideal_masked_input(PhaseGVN *phase, uint mask) { | |
| 2171 Node *val = in(MemNode::ValueIn); | |
| 2172 if( val->Opcode() == Op_AndI ) { | |
| 2173 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
| 2174 if( t && t->is_con() && (t->get_con() & mask) == mask ) { | |
| 2175 set_req(MemNode::ValueIn, val->in(1)); | |
| 2176 return this; | |
| 2177 } | |
| 2178 } | |
| 2179 return NULL; | |
| 2180 } | |
| 2181 | |
| 2182 | |
| 2183 //------------------------------Ideal_sign_extended_input---------------------- | |
| 2184 // Check for useless sign-extension before a partial-word store | |
| 2185 // (StoreB ... (RShiftI _ (LShiftI _ valIn conIL ) conIR) ) | |
| 2186 // If (conIL == conIR && conIR <= num_bits) this simplifies to | |
| 2187 // (StoreB ... (valIn) ) | |
| 2188 Node *StoreNode::Ideal_sign_extended_input(PhaseGVN *phase, int num_bits) { | |
| 2189 Node *val = in(MemNode::ValueIn); | |
| 2190 if( val->Opcode() == Op_RShiftI ) { | |
| 2191 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
| 2192 if( t && t->is_con() && (t->get_con() <= num_bits) ) { | |
| 2193 Node *shl = val->in(1); | |
| 2194 if( shl->Opcode() == Op_LShiftI ) { | |
| 2195 const TypeInt *t2 = phase->type( shl->in(2) )->isa_int(); | |
| 2196 if( t2 && t2->is_con() && (t2->get_con() == t->get_con()) ) { | |
| 2197 set_req(MemNode::ValueIn, shl->in(1)); | |
| 2198 return this; | |
| 2199 } | |
| 2200 } | |
| 2201 } | |
| 2202 } | |
| 2203 return NULL; | |
| 2204 } | |
| 2205 | |
| 2206 //------------------------------value_never_loaded----------------------------------- | |
| 2207 // Determine whether there are any possible loads of the value stored. | |
| 2208 // For simplicity, we actually check if there are any loads from the | |
| 2209 // address stored to, not just for loads of the value stored by this node. | |
| 2210 // | |
| 2211 bool StoreNode::value_never_loaded( PhaseTransform *phase) const { | |
| 2212 Node *adr = in(Address); | |
| 2213 const TypeOopPtr *adr_oop = phase->type(adr)->isa_oopptr(); | |
| 2214 if (adr_oop == NULL) | |
| 2215 return false; | |
| 223 | 2216 if (!adr_oop->is_known_instance_field()) |
| 0 | 2217 return false; // if not a distinct instance, there may be aliases of the address |
| 2218 for (DUIterator_Fast imax, i = adr->fast_outs(imax); i < imax; i++) { | |
| 2219 Node *use = adr->fast_out(i); | |
| 2220 int opc = use->Opcode(); | |
| 2221 if (use->is_Load() || use->is_LoadStore()) { | |
| 2222 return false; | |
| 2223 } | |
| 2224 } | |
| 2225 return true; | |
| 2226 } | |
| 2227 | |
| 2228 //============================================================================= | |
| 2229 //------------------------------Ideal------------------------------------------ | |
| 2230 // If the store is from an AND mask that leaves the low bits untouched, then | |
| 2231 // we can skip the AND operation. If the store is from a sign-extension | |
| 2232 // (a left shift, then right shift) we can skip both. | |
| 2233 Node *StoreBNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
| 2234 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFF); | |
| 2235 if( progress != NULL ) return progress; | |
| 2236 | |
| 2237 progress = StoreNode::Ideal_sign_extended_input(phase, 24); | |
| 2238 if( progress != NULL ) return progress; | |
| 2239 | |
| 2240 // Finally check the default case | |
| 2241 return StoreNode::Ideal(phase, can_reshape); | |
| 2242 } | |
| 2243 | |
| 2244 //============================================================================= | |
| 2245 //------------------------------Ideal------------------------------------------ | |
| 2246 // If the store is from an AND mask that leaves the low bits untouched, then | |
| 2247 // we can skip the AND operation | |
| 2248 Node *StoreCNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
| 2249 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFFFF); | |
| 2250 if( progress != NULL ) return progress; | |
| 2251 | |
| 2252 progress = StoreNode::Ideal_sign_extended_input(phase, 16); | |
| 2253 if( progress != NULL ) return progress; | |
| 2254 | |
| 2255 // Finally check the default case | |
| 2256 return StoreNode::Ideal(phase, can_reshape); | |
| 2257 } | |
| 2258 | |
| 2259 //============================================================================= | |
| 2260 //------------------------------Identity--------------------------------------- | |
| 2261 Node *StoreCMNode::Identity( PhaseTransform *phase ) { | |
| 2262 // No need to card mark when storing a null ptr | |
| 2263 Node* my_store = in(MemNode::OopStore); | |
| 2264 if (my_store->is_Store()) { | |
| 2265 const Type *t1 = phase->type( my_store->in(MemNode::ValueIn) ); | |
| 2266 if( t1 == TypePtr::NULL_PTR ) { | |
| 2267 return in(MemNode::Memory); | |
| 2268 } | |
| 2269 } | |
| 2270 return this; | |
| 2271 } | |
| 2272 | |
| 2273 //------------------------------Value----------------------------------------- | |
| 2274 const Type *StoreCMNode::Value( PhaseTransform *phase ) const { | |
| 43 | 2275 // Either input is TOP ==> the result is TOP |
| 2276 const Type *t = phase->type( in(MemNode::Memory) ); | |
| 2277 if( t == Type::TOP ) return Type::TOP; | |
| 2278 t = phase->type( in(MemNode::Address) ); | |
| 2279 if( t == Type::TOP ) return Type::TOP; | |
| 2280 t = phase->type( in(MemNode::ValueIn) ); | |
| 2281 if( t == Type::TOP ) return Type::TOP; | |
| 0 | 2282 // If extra input is TOP ==> the result is TOP |
| 43 | 2283 t = phase->type( in(MemNode::OopStore) ); |
| 2284 if( t == Type::TOP ) return Type::TOP; | |
| 0 | 2285 |
| 2286 return StoreNode::Value( phase ); | |
| 2287 } | |
| 2288 | |
| 2289 | |
| 2290 //============================================================================= | |
| 2291 //----------------------------------SCMemProjNode------------------------------ | |
| 2292 const Type * SCMemProjNode::Value( PhaseTransform *phase ) const | |
| 2293 { | |
| 2294 return bottom_type(); | |
| 2295 } | |
| 2296 | |
| 2297 //============================================================================= | |
| 2298 LoadStoreNode::LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex ) : Node(5) { | |
| 2299 init_req(MemNode::Control, c ); | |
| 2300 init_req(MemNode::Memory , mem); | |
| 2301 init_req(MemNode::Address, adr); | |
| 2302 init_req(MemNode::ValueIn, val); | |
| 2303 init_req( ExpectedIn, ex ); | |
| 2304 init_class_id(Class_LoadStore); | |
| 2305 | |
| 2306 } | |
| 2307 | |
| 2308 //============================================================================= | |
| 2309 //-------------------------------adr_type-------------------------------------- | |
| 2310 // Do we Match on this edge index or not? Do not match memory | |
| 2311 const TypePtr* ClearArrayNode::adr_type() const { | |
| 2312 Node *adr = in(3); | |
| 2313 return MemNode::calculate_adr_type(adr->bottom_type()); | |
| 2314 } | |
| 2315 | |
| 2316 //------------------------------match_edge------------------------------------- | |
| 2317 // Do we Match on this edge index or not? Do not match memory | |
| 2318 uint ClearArrayNode::match_edge(uint idx) const { | |
| 2319 return idx > 1; | |
| 2320 } | |
| 2321 | |
| 2322 //------------------------------Identity--------------------------------------- | |
| 2323 // Clearing a zero length array does nothing | |
| 2324 Node *ClearArrayNode::Identity( PhaseTransform *phase ) { | |
|
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2325 return phase->type(in(2))->higher_equal(TypeX::ZERO) ? in(1) : this; |
| 0 | 2326 } |
| 2327 | |
| 2328 //------------------------------Idealize--------------------------------------- | |
| 2329 // Clearing a short array is faster with stores | |
| 2330 Node *ClearArrayNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
| 2331 const int unit = BytesPerLong; | |
| 2332 const TypeX* t = phase->type(in(2))->isa_intptr_t(); | |
| 2333 if (!t) return NULL; | |
| 2334 if (!t->is_con()) return NULL; | |
| 2335 intptr_t raw_count = t->get_con(); | |
| 2336 intptr_t size = raw_count; | |
| 2337 if (!Matcher::init_array_count_is_in_bytes) size *= unit; | |
| 2338 // Clearing nothing uses the Identity call. | |
| 2339 // Negative clears are possible on dead ClearArrays | |
| 2340 // (see jck test stmt114.stmt11402.val). | |
| 2341 if (size <= 0 || size % unit != 0) return NULL; | |
| 2342 intptr_t count = size / unit; | |
| 2343 // Length too long; use fast hardware clear | |
| 2344 if (size > Matcher::init_array_short_size) return NULL; | |
| 2345 Node *mem = in(1); | |
| 2346 if( phase->type(mem)==Type::TOP ) return NULL; | |
| 2347 Node *adr = in(3); | |
| 2348 const Type* at = phase->type(adr); | |
| 2349 if( at==Type::TOP ) return NULL; | |
| 2350 const TypePtr* atp = at->isa_ptr(); | |
| 2351 // adjust atp to be the correct array element address type | |
| 2352 if (atp == NULL) atp = TypePtr::BOTTOM; | |
| 2353 else atp = atp->add_offset(Type::OffsetBot); | |
| 2354 // Get base for derived pointer purposes | |
| 2355 if( adr->Opcode() != Op_AddP ) Unimplemented(); | |
| 2356 Node *base = adr->in(1); | |
| 2357 | |
| 2358 Node *zero = phase->makecon(TypeLong::ZERO); | |
| 2359 Node *off = phase->MakeConX(BytesPerLong); | |
| 2360 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
| 2361 count--; | |
| 2362 while( count-- ) { | |
| 2363 mem = phase->transform(mem); | |
| 2364 adr = phase->transform(new (phase->C, 4) AddPNode(base,adr,off)); | |
| 2365 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
| 2366 } | |
| 2367 return mem; | |
| 2368 } | |
| 2369 | |
| 2370 //----------------------------clear_memory------------------------------------- | |
| 2371 // Generate code to initialize object storage to zero. | |
| 2372 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
| 2373 intptr_t start_offset, | |
| 2374 Node* end_offset, | |
| 2375 PhaseGVN* phase) { | |
| 2376 Compile* C = phase->C; | |
| 2377 intptr_t offset = start_offset; | |
| 2378 | |
| 2379 int unit = BytesPerLong; | |
| 2380 if ((offset % unit) != 0) { | |
| 2381 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(offset)); | |
| 2382 adr = phase->transform(adr); | |
| 2383 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
|
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2384 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
| 0 | 2385 mem = phase->transform(mem); |
| 2386 offset += BytesPerInt; | |
| 2387 } | |
| 2388 assert((offset % unit) == 0, ""); | |
| 2389 | |
| 2390 // Initialize the remaining stuff, if any, with a ClearArray. | |
| 2391 return clear_memory(ctl, mem, dest, phase->MakeConX(offset), end_offset, phase); | |
| 2392 } | |
| 2393 | |
| 2394 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
| 2395 Node* start_offset, | |
| 2396 Node* end_offset, | |
| 2397 PhaseGVN* phase) { | |
|
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2398 if (start_offset == end_offset) { |
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2399 // nothing to do |
|
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2400 return mem; |
|
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2401 } |
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|
2402 |
| 0 | 2403 Compile* C = phase->C; |
| 2404 int unit = BytesPerLong; | |
| 2405 Node* zbase = start_offset; | |
| 2406 Node* zend = end_offset; | |
| 2407 | |
| 2408 // Scale to the unit required by the CPU: | |
| 2409 if (!Matcher::init_array_count_is_in_bytes) { | |
| 2410 Node* shift = phase->intcon(exact_log2(unit)); | |
| 2411 zbase = phase->transform( new(C,3) URShiftXNode(zbase, shift) ); | |
| 2412 zend = phase->transform( new(C,3) URShiftXNode(zend, shift) ); | |
| 2413 } | |
| 2414 | |
| 2415 Node* zsize = phase->transform( new(C,3) SubXNode(zend, zbase) ); | |
| 2416 Node* zinit = phase->zerocon((unit == BytesPerLong) ? T_LONG : T_INT); | |
| 2417 | |
| 2418 // Bulk clear double-words | |
| 2419 Node* adr = phase->transform( new(C,4) AddPNode(dest, dest, start_offset) ); | |
| 2420 mem = new (C, 4) ClearArrayNode(ctl, mem, zsize, adr); | |
| 2421 return phase->transform(mem); | |
| 2422 } | |
| 2423 | |
| 2424 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
| 2425 intptr_t start_offset, | |
| 2426 intptr_t end_offset, | |
| 2427 PhaseGVN* phase) { | |
|
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2428 if (start_offset == end_offset) { |
|
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2429 // nothing to do |
|
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2430 return mem; |
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2431 } |
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|
2432 |
| 0 | 2433 Compile* C = phase->C; |
| 2434 assert((end_offset % BytesPerInt) == 0, "odd end offset"); | |
| 2435 intptr_t done_offset = end_offset; | |
| 2436 if ((done_offset % BytesPerLong) != 0) { | |
| 2437 done_offset -= BytesPerInt; | |
| 2438 } | |
| 2439 if (done_offset > start_offset) { | |
| 2440 mem = clear_memory(ctl, mem, dest, | |
| 2441 start_offset, phase->MakeConX(done_offset), phase); | |
| 2442 } | |
| 2443 if (done_offset < end_offset) { // emit the final 32-bit store | |
| 2444 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(done_offset)); | |
| 2445 adr = phase->transform(adr); | |
| 2446 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
|
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2447 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
| 0 | 2448 mem = phase->transform(mem); |
| 2449 done_offset += BytesPerInt; | |
| 2450 } | |
| 2451 assert(done_offset == end_offset, ""); | |
| 2452 return mem; | |
| 2453 } | |
| 2454 | |
| 2455 //============================================================================= | |
| 2456 // Do we match on this edge? No memory edges | |
| 2457 uint StrCompNode::match_edge(uint idx) const { | |
| 2458 return idx == 5 || idx == 6; | |
| 2459 } | |
| 2460 | |
| 2461 //------------------------------Ideal------------------------------------------ | |
| 2462 // Return a node which is more "ideal" than the current node. Strip out | |
| 2463 // control copies | |
| 2464 Node *StrCompNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
| 2465 return remove_dead_region(phase, can_reshape) ? this : NULL; | |
| 2466 } | |
| 2467 | |
|
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2468 //------------------------------Ideal------------------------------------------ |
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2469 // Return a node which is more "ideal" than the current node. Strip out |
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2470 // control copies |
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2471 Node *AryEqNode::Ideal(PhaseGVN *phase, bool can_reshape){ |
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2472 return remove_dead_region(phase, can_reshape) ? this : NULL; |
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2473 } |
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2474 |
| 0 | 2475 |
| 2476 //============================================================================= | |
| 2477 MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent) | |
| 2478 : MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)), | |
| 2479 _adr_type(C->get_adr_type(alias_idx)) | |
| 2480 { | |
| 2481 init_class_id(Class_MemBar); | |
| 2482 Node* top = C->top(); | |
| 2483 init_req(TypeFunc::I_O,top); | |
| 2484 init_req(TypeFunc::FramePtr,top); | |
| 2485 init_req(TypeFunc::ReturnAdr,top); | |
| 2486 if (precedent != NULL) | |
| 2487 init_req(TypeFunc::Parms, precedent); | |
| 2488 } | |
| 2489 | |
| 2490 //------------------------------cmp-------------------------------------------- | |
| 2491 uint MemBarNode::hash() const { return NO_HASH; } | |
| 2492 uint MemBarNode::cmp( const Node &n ) const { | |
| 2493 return (&n == this); // Always fail except on self | |
| 2494 } | |
| 2495 | |
| 2496 //------------------------------make------------------------------------------- | |
| 2497 MemBarNode* MemBarNode::make(Compile* C, int opcode, int atp, Node* pn) { | |
| 2498 int len = Precedent + (pn == NULL? 0: 1); | |
| 2499 switch (opcode) { | |
| 2500 case Op_MemBarAcquire: return new(C, len) MemBarAcquireNode(C, atp, pn); | |
| 2501 case Op_MemBarRelease: return new(C, len) MemBarReleaseNode(C, atp, pn); | |
| 2502 case Op_MemBarVolatile: return new(C, len) MemBarVolatileNode(C, atp, pn); | |
| 2503 case Op_MemBarCPUOrder: return new(C, len) MemBarCPUOrderNode(C, atp, pn); | |
| 2504 case Op_Initialize: return new(C, len) InitializeNode(C, atp, pn); | |
| 2505 default: ShouldNotReachHere(); return NULL; | |
| 2506 } | |
| 2507 } | |
| 2508 | |
| 2509 //------------------------------Ideal------------------------------------------ | |
| 2510 // Return a node which is more "ideal" than the current node. Strip out | |
| 2511 // control copies | |
| 2512 Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 305 | 2513 return remove_dead_region(phase, can_reshape) ? this : NULL; |
| 0 | 2514 } |
| 2515 | |
| 2516 //------------------------------Value------------------------------------------ | |
| 2517 const Type *MemBarNode::Value( PhaseTransform *phase ) const { | |
| 2518 if( !in(0) ) return Type::TOP; | |
| 2519 if( phase->type(in(0)) == Type::TOP ) | |
| 2520 return Type::TOP; | |
| 2521 return TypeTuple::MEMBAR; | |
| 2522 } | |
| 2523 | |
| 2524 //------------------------------match------------------------------------------ | |
| 2525 // Construct projections for memory. | |
| 2526 Node *MemBarNode::match( const ProjNode *proj, const Matcher *m ) { | |
| 2527 switch (proj->_con) { | |
| 2528 case TypeFunc::Control: | |
| 2529 case TypeFunc::Memory: | |
| 2530 return new (m->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); | |
| 2531 } | |
| 2532 ShouldNotReachHere(); | |
| 2533 return NULL; | |
| 2534 } | |
| 2535 | |
| 2536 //===========================InitializeNode==================================== | |
| 2537 // SUMMARY: | |
| 2538 // This node acts as a memory barrier on raw memory, after some raw stores. | |
| 2539 // The 'cooked' oop value feeds from the Initialize, not the Allocation. | |
| 2540 // The Initialize can 'capture' suitably constrained stores as raw inits. | |
| 2541 // It can coalesce related raw stores into larger units (called 'tiles'). | |
| 2542 // It can avoid zeroing new storage for memory units which have raw inits. | |
| 2543 // At macro-expansion, it is marked 'complete', and does not optimize further. | |
| 2544 // | |
| 2545 // EXAMPLE: | |
| 2546 // The object 'new short[2]' occupies 16 bytes in a 32-bit machine. | |
| 2547 // ctl = incoming control; mem* = incoming memory | |
| 2548 // (Note: A star * on a memory edge denotes I/O and other standard edges.) | |
| 2549 // First allocate uninitialized memory and fill in the header: | |
| 2550 // alloc = (Allocate ctl mem* 16 #short[].klass ...) | |
| 2551 // ctl := alloc.Control; mem* := alloc.Memory* | |
| 2552 // rawmem = alloc.Memory; rawoop = alloc.RawAddress | |
| 2553 // Then initialize to zero the non-header parts of the raw memory block: | |
| 2554 // init = (Initialize alloc.Control alloc.Memory* alloc.RawAddress) | |
| 2555 // ctl := init.Control; mem.SLICE(#short[*]) := init.Memory | |
| 2556 // After the initialize node executes, the object is ready for service: | |
| 2557 // oop := (CheckCastPP init.Control alloc.RawAddress #short[]) | |
| 2558 // Suppose its body is immediately initialized as {1,2}: | |
| 2559 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
| 2560 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
| 2561 // mem.SLICE(#short[*]) := store2 | |
| 2562 // | |
| 2563 // DETAILS: | |
| 2564 // An InitializeNode collects and isolates object initialization after | |
| 2565 // an AllocateNode and before the next possible safepoint. As a | |
| 2566 // memory barrier (MemBarNode), it keeps critical stores from drifting | |
| 2567 // down past any safepoint or any publication of the allocation. | |
| 2568 // Before this barrier, a newly-allocated object may have uninitialized bits. | |
| 2569 // After this barrier, it may be treated as a real oop, and GC is allowed. | |
| 2570 // | |
| 2571 // The semantics of the InitializeNode include an implicit zeroing of | |
| 2572 // the new object from object header to the end of the object. | |
| 2573 // (The object header and end are determined by the AllocateNode.) | |
| 2574 // | |
| 2575 // Certain stores may be added as direct inputs to the InitializeNode. | |
| 2576 // These stores must update raw memory, and they must be to addresses | |
| 2577 // derived from the raw address produced by AllocateNode, and with | |
| 2578 // a constant offset. They must be ordered by increasing offset. | |
| 2579 // The first one is at in(RawStores), the last at in(req()-1). | |
| 2580 // Unlike most memory operations, they are not linked in a chain, | |
| 2581 // but are displayed in parallel as users of the rawmem output of | |
| 2582 // the allocation. | |
| 2583 // | |
| 2584 // (See comments in InitializeNode::capture_store, which continue | |
| 2585 // the example given above.) | |
| 2586 // | |
| 2587 // When the associated Allocate is macro-expanded, the InitializeNode | |
| 2588 // may be rewritten to optimize collected stores. A ClearArrayNode | |
| 2589 // may also be created at that point to represent any required zeroing. | |
| 2590 // The InitializeNode is then marked 'complete', prohibiting further | |
| 2591 // capturing of nearby memory operations. | |
| 2592 // | |
| 2593 // During macro-expansion, all captured initializations which store | |
| 2594 // constant values of 32 bits or smaller are coalesced (if advantagous) | |
| 2595 // into larger 'tiles' 32 or 64 bits. This allows an object to be | |
| 2596 // initialized in fewer memory operations. Memory words which are | |
| 2597 // covered by neither tiles nor non-constant stores are pre-zeroed | |
| 2598 // by explicit stores of zero. (The code shape happens to do all | |
| 2599 // zeroing first, then all other stores, with both sequences occurring | |
| 2600 // in order of ascending offsets.) | |
| 2601 // | |
| 2602 // Alternatively, code may be inserted between an AllocateNode and its | |
| 2603 // InitializeNode, to perform arbitrary initialization of the new object. | |
| 2604 // E.g., the object copying intrinsics insert complex data transfers here. | |
| 2605 // The initialization must then be marked as 'complete' disable the | |
| 2606 // built-in zeroing semantics and the collection of initializing stores. | |
| 2607 // | |
| 2608 // While an InitializeNode is incomplete, reads from the memory state | |
| 2609 // produced by it are optimizable if they match the control edge and | |
| 2610 // new oop address associated with the allocation/initialization. | |
| 2611 // They return a stored value (if the offset matches) or else zero. | |
| 2612 // A write to the memory state, if it matches control and address, | |
| 2613 // and if it is to a constant offset, may be 'captured' by the | |
| 2614 // InitializeNode. It is cloned as a raw memory operation and rewired | |
| 2615 // inside the initialization, to the raw oop produced by the allocation. | |
| 2616 // Operations on addresses which are provably distinct (e.g., to | |
| 2617 // other AllocateNodes) are allowed to bypass the initialization. | |
| 2618 // | |
| 2619 // The effect of all this is to consolidate object initialization | |
| 2620 // (both arrays and non-arrays, both piecewise and bulk) into a | |
| 2621 // single location, where it can be optimized as a unit. | |
| 2622 // | |
| 2623 // Only stores with an offset less than TrackedInitializationLimit words | |
| 2624 // will be considered for capture by an InitializeNode. This puts a | |
| 2625 // reasonable limit on the complexity of optimized initializations. | |
| 2626 | |
| 2627 //---------------------------InitializeNode------------------------------------ | |
| 2628 InitializeNode::InitializeNode(Compile* C, int adr_type, Node* rawoop) | |
| 2629 : _is_complete(false), | |
| 2630 MemBarNode(C, adr_type, rawoop) | |
| 2631 { | |
| 2632 init_class_id(Class_Initialize); | |
| 2633 | |
| 2634 assert(adr_type == Compile::AliasIdxRaw, "only valid atp"); | |
| 2635 assert(in(RawAddress) == rawoop, "proper init"); | |
| 2636 // Note: allocation() can be NULL, for secondary initialization barriers | |
| 2637 } | |
| 2638 | |
| 2639 // Since this node is not matched, it will be processed by the | |
| 2640 // register allocator. Declare that there are no constraints | |
| 2641 // on the allocation of the RawAddress edge. | |
| 2642 const RegMask &InitializeNode::in_RegMask(uint idx) const { | |
| 2643 // This edge should be set to top, by the set_complete. But be conservative. | |
| 2644 if (idx == InitializeNode::RawAddress) | |
| 2645 return *(Compile::current()->matcher()->idealreg2spillmask[in(idx)->ideal_reg()]); | |
| 2646 return RegMask::Empty; | |
| 2647 } | |
| 2648 | |
| 2649 Node* InitializeNode::memory(uint alias_idx) { | |
| 2650 Node* mem = in(Memory); | |
| 2651 if (mem->is_MergeMem()) { | |
| 2652 return mem->as_MergeMem()->memory_at(alias_idx); | |
| 2653 } else { | |
| 2654 // incoming raw memory is not split | |
| 2655 return mem; | |
| 2656 } | |
| 2657 } | |
| 2658 | |
| 2659 bool InitializeNode::is_non_zero() { | |
| 2660 if (is_complete()) return false; | |
| 2661 remove_extra_zeroes(); | |
| 2662 return (req() > RawStores); | |
| 2663 } | |
| 2664 | |
| 2665 void InitializeNode::set_complete(PhaseGVN* phase) { | |
| 2666 assert(!is_complete(), "caller responsibility"); | |
| 2667 _is_complete = true; | |
| 2668 | |
| 2669 // After this node is complete, it contains a bunch of | |
| 2670 // raw-memory initializations. There is no need for | |
| 2671 // it to have anything to do with non-raw memory effects. | |
| 2672 // Therefore, tell all non-raw users to re-optimize themselves, | |
| 2673 // after skipping the memory effects of this initialization. | |
| 2674 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
| 2675 if (igvn) igvn->add_users_to_worklist(this); | |
| 2676 } | |
| 2677 | |
| 2678 // convenience function | |
| 2679 // return false if the init contains any stores already | |
| 2680 bool AllocateNode::maybe_set_complete(PhaseGVN* phase) { | |
| 2681 InitializeNode* init = initialization(); | |
| 2682 if (init == NULL || init->is_complete()) return false; | |
| 2683 init->remove_extra_zeroes(); | |
| 2684 // for now, if this allocation has already collected any inits, bail: | |
| 2685 if (init->is_non_zero()) return false; | |
| 2686 init->set_complete(phase); | |
| 2687 return true; | |
| 2688 } | |
| 2689 | |
| 2690 void InitializeNode::remove_extra_zeroes() { | |
| 2691 if (req() == RawStores) return; | |
| 2692 Node* zmem = zero_memory(); | |
| 2693 uint fill = RawStores; | |
| 2694 for (uint i = fill; i < req(); i++) { | |
| 2695 Node* n = in(i); | |
| 2696 if (n->is_top() || n == zmem) continue; // skip | |
| 2697 if (fill < i) set_req(fill, n); // compact | |
| 2698 ++fill; | |
| 2699 } | |
| 2700 // delete any empty spaces created: | |
| 2701 while (fill < req()) { | |
| 2702 del_req(fill); | |
| 2703 } | |
| 2704 } | |
| 2705 | |
| 2706 // Helper for remembering which stores go with which offsets. | |
| 2707 intptr_t InitializeNode::get_store_offset(Node* st, PhaseTransform* phase) { | |
| 2708 if (!st->is_Store()) return -1; // can happen to dead code via subsume_node | |
| 2709 intptr_t offset = -1; | |
| 2710 Node* base = AddPNode::Ideal_base_and_offset(st->in(MemNode::Address), | |
| 2711 phase, offset); | |
| 2712 if (base == NULL) return -1; // something is dead, | |
| 2713 if (offset < 0) return -1; // dead, dead | |
| 2714 return offset; | |
| 2715 } | |
| 2716 | |
| 2717 // Helper for proving that an initialization expression is | |
| 2718 // "simple enough" to be folded into an object initialization. | |
| 2719 // Attempts to prove that a store's initial value 'n' can be captured | |
| 2720 // within the initialization without creating a vicious cycle, such as: | |
| 2721 // { Foo p = new Foo(); p.next = p; } | |
| 2722 // True for constants and parameters and small combinations thereof. | |
| 2723 bool InitializeNode::detect_init_independence(Node* n, | |
| 2724 bool st_is_pinned, | |
| 2725 int& count) { | |
| 2726 if (n == NULL) return true; // (can this really happen?) | |
| 2727 if (n->is_Proj()) n = n->in(0); | |
| 2728 if (n == this) return false; // found a cycle | |
| 2729 if (n->is_Con()) return true; | |
| 2730 if (n->is_Start()) return true; // params, etc., are OK | |
| 2731 if (n->is_Root()) return true; // even better | |
| 2732 | |
| 2733 Node* ctl = n->in(0); | |
| 2734 if (ctl != NULL && !ctl->is_top()) { | |
| 2735 if (ctl->is_Proj()) ctl = ctl->in(0); | |
| 2736 if (ctl == this) return false; | |
| 2737 | |
| 2738 // If we already know that the enclosing memory op is pinned right after | |
| 2739 // the init, then any control flow that the store has picked up | |
| 2740 // must have preceded the init, or else be equal to the init. | |
| 2741 // Even after loop optimizations (which might change control edges) | |
| 2742 // a store is never pinned *before* the availability of its inputs. | |
|
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2743 if (!MemNode::all_controls_dominate(n, this)) |
| 0 | 2744 return false; // failed to prove a good control |
| 2745 | |
| 2746 } | |
| 2747 | |
| 2748 // Check data edges for possible dependencies on 'this'. | |
| 2749 if ((count += 1) > 20) return false; // complexity limit | |
| 2750 for (uint i = 1; i < n->req(); i++) { | |
| 2751 Node* m = n->in(i); | |
| 2752 if (m == NULL || m == n || m->is_top()) continue; | |
| 2753 uint first_i = n->find_edge(m); | |
| 2754 if (i != first_i) continue; // process duplicate edge just once | |
| 2755 if (!detect_init_independence(m, st_is_pinned, count)) { | |
| 2756 return false; | |
| 2757 } | |
| 2758 } | |
| 2759 | |
| 2760 return true; | |
| 2761 } | |
| 2762 | |
| 2763 // Here are all the checks a Store must pass before it can be moved into | |
| 2764 // an initialization. Returns zero if a check fails. | |
| 2765 // On success, returns the (constant) offset to which the store applies, | |
| 2766 // within the initialized memory. | |
| 2767 intptr_t InitializeNode::can_capture_store(StoreNode* st, PhaseTransform* phase) { | |
| 2768 const int FAIL = 0; | |
| 2769 if (st->req() != MemNode::ValueIn + 1) | |
| 2770 return FAIL; // an inscrutable StoreNode (card mark?) | |
| 2771 Node* ctl = st->in(MemNode::Control); | |
| 2772 if (!(ctl != NULL && ctl->is_Proj() && ctl->in(0) == this)) | |
| 2773 return FAIL; // must be unconditional after the initialization | |
| 2774 Node* mem = st->in(MemNode::Memory); | |
| 2775 if (!(mem->is_Proj() && mem->in(0) == this)) | |
| 2776 return FAIL; // must not be preceded by other stores | |
| 2777 Node* adr = st->in(MemNode::Address); | |
| 2778 intptr_t offset; | |
| 2779 AllocateNode* alloc = AllocateNode::Ideal_allocation(adr, phase, offset); | |
| 2780 if (alloc == NULL) | |
| 2781 return FAIL; // inscrutable address | |
| 2782 if (alloc != allocation()) | |
| 2783 return FAIL; // wrong allocation! (store needs to float up) | |
| 2784 Node* val = st->in(MemNode::ValueIn); | |
| 2785 int complexity_count = 0; | |
| 2786 if (!detect_init_independence(val, true, complexity_count)) | |
| 2787 return FAIL; // stored value must be 'simple enough' | |
| 2788 | |
| 2789 return offset; // success | |
| 2790 } | |
| 2791 | |
| 2792 // Find the captured store in(i) which corresponds to the range | |
| 2793 // [start..start+size) in the initialized object. | |
| 2794 // If there is one, return its index i. If there isn't, return the | |
| 2795 // negative of the index where it should be inserted. | |
| 2796 // Return 0 if the queried range overlaps an initialization boundary | |
| 2797 // or if dead code is encountered. | |
| 2798 // If size_in_bytes is zero, do not bother with overlap checks. | |
| 2799 int InitializeNode::captured_store_insertion_point(intptr_t start, | |
| 2800 int size_in_bytes, | |
| 2801 PhaseTransform* phase) { | |
| 2802 const int FAIL = 0, MAX_STORE = BytesPerLong; | |
| 2803 | |
| 2804 if (is_complete()) | |
| 2805 return FAIL; // arraycopy got here first; punt | |
| 2806 | |
| 2807 assert(allocation() != NULL, "must be present"); | |
| 2808 | |
| 2809 // no negatives, no header fields: | |
|
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2810 if (start < (intptr_t) allocation()->minimum_header_size()) return FAIL; |
| 0 | 2811 |
| 2812 // after a certain size, we bail out on tracking all the stores: | |
| 2813 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
| 2814 if (start >= ti_limit) return FAIL; | |
| 2815 | |
| 2816 for (uint i = InitializeNode::RawStores, limit = req(); ; ) { | |
| 2817 if (i >= limit) return -(int)i; // not found; here is where to put it | |
| 2818 | |
| 2819 Node* st = in(i); | |
| 2820 intptr_t st_off = get_store_offset(st, phase); | |
| 2821 if (st_off < 0) { | |
| 2822 if (st != zero_memory()) { | |
| 2823 return FAIL; // bail out if there is dead garbage | |
| 2824 } | |
| 2825 } else if (st_off > start) { | |
| 2826 // ...we are done, since stores are ordered | |
| 2827 if (st_off < start + size_in_bytes) { | |
| 2828 return FAIL; // the next store overlaps | |
| 2829 } | |
| 2830 return -(int)i; // not found; here is where to put it | |
| 2831 } else if (st_off < start) { | |
| 2832 if (size_in_bytes != 0 && | |
| 2833 start < st_off + MAX_STORE && | |
| 2834 start < st_off + st->as_Store()->memory_size()) { | |
| 2835 return FAIL; // the previous store overlaps | |
| 2836 } | |
| 2837 } else { | |
| 2838 if (size_in_bytes != 0 && | |
| 2839 st->as_Store()->memory_size() != size_in_bytes) { | |
| 2840 return FAIL; // mismatched store size | |
| 2841 } | |
| 2842 return i; | |
| 2843 } | |
| 2844 | |
| 2845 ++i; | |
| 2846 } | |
| 2847 } | |
| 2848 | |
| 2849 // Look for a captured store which initializes at the offset 'start' | |
| 2850 // with the given size. If there is no such store, and no other | |
| 2851 // initialization interferes, then return zero_memory (the memory | |
| 2852 // projection of the AllocateNode). | |
| 2853 Node* InitializeNode::find_captured_store(intptr_t start, int size_in_bytes, | |
| 2854 PhaseTransform* phase) { | |
| 2855 assert(stores_are_sane(phase), ""); | |
| 2856 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
| 2857 if (i == 0) { | |
| 2858 return NULL; // something is dead | |
| 2859 } else if (i < 0) { | |
| 2860 return zero_memory(); // just primordial zero bits here | |
| 2861 } else { | |
| 2862 Node* st = in(i); // here is the store at this position | |
| 2863 assert(get_store_offset(st->as_Store(), phase) == start, "sanity"); | |
| 2864 return st; | |
| 2865 } | |
| 2866 } | |
| 2867 | |
| 2868 // Create, as a raw pointer, an address within my new object at 'offset'. | |
| 2869 Node* InitializeNode::make_raw_address(intptr_t offset, | |
| 2870 PhaseTransform* phase) { | |
| 2871 Node* addr = in(RawAddress); | |
| 2872 if (offset != 0) { | |
| 2873 Compile* C = phase->C; | |
| 2874 addr = phase->transform( new (C, 4) AddPNode(C->top(), addr, | |
| 2875 phase->MakeConX(offset)) ); | |
| 2876 } | |
| 2877 return addr; | |
| 2878 } | |
| 2879 | |
| 2880 // Clone the given store, converting it into a raw store | |
| 2881 // initializing a field or element of my new object. | |
| 2882 // Caller is responsible for retiring the original store, | |
| 2883 // with subsume_node or the like. | |
| 2884 // | |
| 2885 // From the example above InitializeNode::InitializeNode, | |
| 2886 // here are the old stores to be captured: | |
| 2887 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
| 2888 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
| 2889 // | |
| 2890 // Here is the changed code; note the extra edges on init: | |
| 2891 // alloc = (Allocate ...) | |
| 2892 // rawoop = alloc.RawAddress | |
| 2893 // rawstore1 = (StoreC alloc.Control alloc.Memory (+ rawoop 12) 1) | |
| 2894 // rawstore2 = (StoreC alloc.Control alloc.Memory (+ rawoop 14) 2) | |
| 2895 // init = (Initialize alloc.Control alloc.Memory rawoop | |
| 2896 // rawstore1 rawstore2) | |
| 2897 // | |
| 2898 Node* InitializeNode::capture_store(StoreNode* st, intptr_t start, | |
| 2899 PhaseTransform* phase) { | |
| 2900 assert(stores_are_sane(phase), ""); | |
| 2901 | |
| 2902 if (start < 0) return NULL; | |
| 2903 assert(can_capture_store(st, phase) == start, "sanity"); | |
| 2904 | |
| 2905 Compile* C = phase->C; | |
| 2906 int size_in_bytes = st->memory_size(); | |
| 2907 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
| 2908 if (i == 0) return NULL; // bail out | |
| 2909 Node* prev_mem = NULL; // raw memory for the captured store | |
| 2910 if (i > 0) { | |
| 2911 prev_mem = in(i); // there is a pre-existing store under this one | |
| 2912 set_req(i, C->top()); // temporarily disconnect it | |
| 2913 // See StoreNode::Ideal 'st->outcnt() == 1' for the reason to disconnect. | |
| 2914 } else { | |
| 2915 i = -i; // no pre-existing store | |
| 2916 prev_mem = zero_memory(); // a slice of the newly allocated object | |
| 2917 if (i > InitializeNode::RawStores && in(i-1) == prev_mem) | |
| 2918 set_req(--i, C->top()); // reuse this edge; it has been folded away | |
| 2919 else | |
| 2920 ins_req(i, C->top()); // build a new edge | |
| 2921 } | |
| 2922 Node* new_st = st->clone(); | |
| 2923 new_st->set_req(MemNode::Control, in(Control)); | |
| 2924 new_st->set_req(MemNode::Memory, prev_mem); | |
| 2925 new_st->set_req(MemNode::Address, make_raw_address(start, phase)); | |
| 2926 new_st = phase->transform(new_st); | |
| 2927 | |
| 2928 // At this point, new_st might have swallowed a pre-existing store | |
| 2929 // at the same offset, or perhaps new_st might have disappeared, | |
| 2930 // if it redundantly stored the same value (or zero to fresh memory). | |
| 2931 | |
| 2932 // In any case, wire it in: | |
| 2933 set_req(i, new_st); | |
| 2934 | |
| 2935 // The caller may now kill the old guy. | |
| 2936 DEBUG_ONLY(Node* check_st = find_captured_store(start, size_in_bytes, phase)); | |
| 2937 assert(check_st == new_st || check_st == NULL, "must be findable"); | |
| 2938 assert(!is_complete(), ""); | |
| 2939 return new_st; | |
| 2940 } | |
| 2941 | |
| 2942 static bool store_constant(jlong* tiles, int num_tiles, | |
| 2943 intptr_t st_off, int st_size, | |
| 2944 jlong con) { | |
| 2945 if ((st_off & (st_size-1)) != 0) | |
| 2946 return false; // strange store offset (assume size==2**N) | |
| 2947 address addr = (address)tiles + st_off; | |
| 2948 assert(st_off >= 0 && addr+st_size <= (address)&tiles[num_tiles], "oob"); | |
| 2949 switch (st_size) { | |
| 2950 case sizeof(jbyte): *(jbyte*) addr = (jbyte) con; break; | |
| 2951 case sizeof(jchar): *(jchar*) addr = (jchar) con; break; | |
| 2952 case sizeof(jint): *(jint*) addr = (jint) con; break; | |
| 2953 case sizeof(jlong): *(jlong*) addr = (jlong) con; break; | |
| 2954 default: return false; // strange store size (detect size!=2**N here) | |
| 2955 } | |
| 2956 return true; // return success to caller | |
| 2957 } | |
| 2958 | |
| 2959 // Coalesce subword constants into int constants and possibly | |
| 2960 // into long constants. The goal, if the CPU permits, | |
| 2961 // is to initialize the object with a small number of 64-bit tiles. | |
| 2962 // Also, convert floating-point constants to bit patterns. | |
| 2963 // Non-constants are not relevant to this pass. | |
| 2964 // | |
| 2965 // In terms of the running example on InitializeNode::InitializeNode | |
| 2966 // and InitializeNode::capture_store, here is the transformation | |
| 2967 // of rawstore1 and rawstore2 into rawstore12: | |
| 2968 // alloc = (Allocate ...) | |
| 2969 // rawoop = alloc.RawAddress | |
| 2970 // tile12 = 0x00010002 | |
| 2971 // rawstore12 = (StoreI alloc.Control alloc.Memory (+ rawoop 12) tile12) | |
| 2972 // init = (Initialize alloc.Control alloc.Memory rawoop rawstore12) | |
| 2973 // | |
| 2974 void | |
| 2975 InitializeNode::coalesce_subword_stores(intptr_t header_size, | |
| 2976 Node* size_in_bytes, | |
| 2977 PhaseGVN* phase) { | |
| 2978 Compile* C = phase->C; | |
| 2979 | |
| 2980 assert(stores_are_sane(phase), ""); | |
| 2981 // Note: After this pass, they are not completely sane, | |
| 2982 // since there may be some overlaps. | |
| 2983 | |
| 2984 int old_subword = 0, old_long = 0, new_int = 0, new_long = 0; | |
| 2985 | |
| 2986 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
| 2987 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, ti_limit); | |
| 2988 size_limit = MIN2(size_limit, ti_limit); | |
| 2989 size_limit = align_size_up(size_limit, BytesPerLong); | |
| 2990 int num_tiles = size_limit / BytesPerLong; | |
| 2991 | |
| 2992 // allocate space for the tile map: | |
| 2993 const int small_len = DEBUG_ONLY(true ? 3 :) 30; // keep stack frames small | |
| 2994 jlong tiles_buf[small_len]; | |
| 2995 Node* nodes_buf[small_len]; | |
| 2996 jlong inits_buf[small_len]; | |
| 2997 jlong* tiles = ((num_tiles <= small_len) ? &tiles_buf[0] | |
| 2998 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
| 2999 Node** nodes = ((num_tiles <= small_len) ? &nodes_buf[0] | |
| 3000 : NEW_RESOURCE_ARRAY(Node*, num_tiles)); | |
| 3001 jlong* inits = ((num_tiles <= small_len) ? &inits_buf[0] | |
| 3002 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
| 3003 // tiles: exact bitwise model of all primitive constants | |
| 3004 // nodes: last constant-storing node subsumed into the tiles model | |
| 3005 // inits: which bytes (in each tile) are touched by any initializations | |
| 3006 | |
| 3007 //// Pass A: Fill in the tile model with any relevant stores. | |
| 3008 | |
| 3009 Copy::zero_to_bytes(tiles, sizeof(tiles[0]) * num_tiles); | |
| 3010 Copy::zero_to_bytes(nodes, sizeof(nodes[0]) * num_tiles); | |
| 3011 Copy::zero_to_bytes(inits, sizeof(inits[0]) * num_tiles); | |
| 3012 Node* zmem = zero_memory(); // initially zero memory state | |
| 3013 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
| 3014 Node* st = in(i); | |
| 3015 intptr_t st_off = get_store_offset(st, phase); | |
| 3016 | |
| 3017 // Figure out the store's offset and constant value: | |
| 3018 if (st_off < header_size) continue; //skip (ignore header) | |
| 3019 if (st->in(MemNode::Memory) != zmem) continue; //skip (odd store chain) | |
| 3020 int st_size = st->as_Store()->memory_size(); | |
| 3021 if (st_off + st_size > size_limit) break; | |
| 3022 | |
| 3023 // Record which bytes are touched, whether by constant or not. | |
| 3024 if (!store_constant(inits, num_tiles, st_off, st_size, (jlong) -1)) | |
| 3025 continue; // skip (strange store size) | |
| 3026 | |
| 3027 const Type* val = phase->type(st->in(MemNode::ValueIn)); | |
| 3028 if (!val->singleton()) continue; //skip (non-con store) | |
| 3029 BasicType type = val->basic_type(); | |
| 3030 | |
| 3031 jlong con = 0; | |
| 3032 switch (type) { | |
| 3033 case T_INT: con = val->is_int()->get_con(); break; | |
| 3034 case T_LONG: con = val->is_long()->get_con(); break; | |
| 3035 case T_FLOAT: con = jint_cast(val->getf()); break; | |
| 3036 case T_DOUBLE: con = jlong_cast(val->getd()); break; | |
| 3037 default: continue; //skip (odd store type) | |
| 3038 } | |
| 3039 | |
| 3040 if (type == T_LONG && Matcher::isSimpleConstant64(con) && | |
| 3041 st->Opcode() == Op_StoreL) { | |
| 3042 continue; // This StoreL is already optimal. | |
| 3043 } | |
| 3044 | |
| 3045 // Store down the constant. | |
| 3046 store_constant(tiles, num_tiles, st_off, st_size, con); | |
| 3047 | |
| 3048 intptr_t j = st_off >> LogBytesPerLong; | |
| 3049 | |
| 3050 if (type == T_INT && st_size == BytesPerInt | |
| 3051 && (st_off & BytesPerInt) == BytesPerInt) { | |
| 3052 jlong lcon = tiles[j]; | |
| 3053 if (!Matcher::isSimpleConstant64(lcon) && | |
| 3054 st->Opcode() == Op_StoreI) { | |
| 3055 // This StoreI is already optimal by itself. | |
| 3056 jint* intcon = (jint*) &tiles[j]; | |
| 3057 intcon[1] = 0; // undo the store_constant() | |
| 3058 | |
| 3059 // If the previous store is also optimal by itself, back up and | |
| 3060 // undo the action of the previous loop iteration... if we can. | |
| 3061 // But if we can't, just let the previous half take care of itself. | |
| 3062 st = nodes[j]; | |
| 3063 st_off -= BytesPerInt; | |
| 3064 con = intcon[0]; | |
| 3065 if (con != 0 && st != NULL && st->Opcode() == Op_StoreI) { | |
| 3066 assert(st_off >= header_size, "still ignoring header"); | |
| 3067 assert(get_store_offset(st, phase) == st_off, "must be"); | |
| 3068 assert(in(i-1) == zmem, "must be"); | |
| 3069 DEBUG_ONLY(const Type* tcon = phase->type(st->in(MemNode::ValueIn))); | |
| 3070 assert(con == tcon->is_int()->get_con(), "must be"); | |
| 3071 // Undo the effects of the previous loop trip, which swallowed st: | |
| 3072 intcon[0] = 0; // undo store_constant() | |
| 3073 set_req(i-1, st); // undo set_req(i, zmem) | |
| 3074 nodes[j] = NULL; // undo nodes[j] = st | |
| 3075 --old_subword; // undo ++old_subword | |
| 3076 } | |
| 3077 continue; // This StoreI is already optimal. | |
| 3078 } | |
| 3079 } | |
| 3080 | |
| 3081 // This store is not needed. | |
| 3082 set_req(i, zmem); | |
| 3083 nodes[j] = st; // record for the moment | |
| 3084 if (st_size < BytesPerLong) // something has changed | |
| 3085 ++old_subword; // includes int/float, but who's counting... | |
| 3086 else ++old_long; | |
| 3087 } | |
| 3088 | |
| 3089 if ((old_subword + old_long) == 0) | |
| 3090 return; // nothing more to do | |
| 3091 | |
| 3092 //// Pass B: Convert any non-zero tiles into optimal constant stores. | |
| 3093 // Be sure to insert them before overlapping non-constant stores. | |
| 3094 // (E.g., byte[] x = { 1,2,y,4 } => x[int 0] = 0x01020004, x[2]=y.) | |
| 3095 for (int j = 0; j < num_tiles; j++) { | |
| 3096 jlong con = tiles[j]; | |
| 3097 jlong init = inits[j]; | |
| 3098 if (con == 0) continue; | |
| 3099 jint con0, con1; // split the constant, address-wise | |
| 3100 jint init0, init1; // split the init map, address-wise | |
| 3101 { union { jlong con; jint intcon[2]; } u; | |
| 3102 u.con = con; | |
| 3103 con0 = u.intcon[0]; | |
| 3104 con1 = u.intcon[1]; | |
| 3105 u.con = init; | |
| 3106 init0 = u.intcon[0]; | |
| 3107 init1 = u.intcon[1]; | |
| 3108 } | |
| 3109 | |
| 3110 Node* old = nodes[j]; | |
| 3111 assert(old != NULL, "need the prior store"); | |
| 3112 intptr_t offset = (j * BytesPerLong); | |
| 3113 | |
| 3114 bool split = !Matcher::isSimpleConstant64(con); | |
| 3115 | |
| 3116 if (offset < header_size) { | |
| 3117 assert(offset + BytesPerInt >= header_size, "second int counts"); | |
| 3118 assert(*(jint*)&tiles[j] == 0, "junk in header"); | |
| 3119 split = true; // only the second word counts | |
| 3120 // Example: int a[] = { 42 ... } | |
| 3121 } else if (con0 == 0 && init0 == -1) { | |
| 3122 split = true; // first word is covered by full inits | |
| 3123 // Example: int a[] = { ... foo(), 42 ... } | |
| 3124 } else if (con1 == 0 && init1 == -1) { | |
| 3125 split = true; // second word is covered by full inits | |
| 3126 // Example: int a[] = { ... 42, foo() ... } | |
| 3127 } | |
| 3128 | |
| 3129 // Here's a case where init0 is neither 0 nor -1: | |
| 3130 // byte a[] = { ... 0,0,foo(),0, 0,0,0,42 ... } | |
| 3131 // Assuming big-endian memory, init0, init1 are 0x0000FF00, 0x000000FF. | |
| 3132 // In this case the tile is not split; it is (jlong)42. | |
| 3133 // The big tile is stored down, and then the foo() value is inserted. | |
| 3134 // (If there were foo(),foo() instead of foo(),0, init0 would be -1.) | |
| 3135 | |
| 3136 Node* ctl = old->in(MemNode::Control); | |
| 3137 Node* adr = make_raw_address(offset, phase); | |
| 3138 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
| 3139 | |
| 3140 // One or two coalesced stores to plop down. | |
| 3141 Node* st[2]; | |
| 3142 intptr_t off[2]; | |
| 3143 int nst = 0; | |
| 3144 if (!split) { | |
| 3145 ++new_long; | |
| 3146 off[nst] = offset; | |
|
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3147 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
| 0 | 3148 phase->longcon(con), T_LONG); |
| 3149 } else { | |
| 3150 // Omit either if it is a zero. | |
| 3151 if (con0 != 0) { | |
| 3152 ++new_int; | |
| 3153 off[nst] = offset; | |
|
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3154 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
| 0 | 3155 phase->intcon(con0), T_INT); |
| 3156 } | |
| 3157 if (con1 != 0) { | |
| 3158 ++new_int; | |
| 3159 offset += BytesPerInt; | |
| 3160 adr = make_raw_address(offset, phase); | |
| 3161 off[nst] = offset; | |
|
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3162 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
| 0 | 3163 phase->intcon(con1), T_INT); |
| 3164 } | |
| 3165 } | |
| 3166 | |
| 3167 // Insert second store first, then the first before the second. | |
| 3168 // Insert each one just before any overlapping non-constant stores. | |
| 3169 while (nst > 0) { | |
| 3170 Node* st1 = st[--nst]; | |
| 3171 C->copy_node_notes_to(st1, old); | |
| 3172 st1 = phase->transform(st1); | |
| 3173 offset = off[nst]; | |
| 3174 assert(offset >= header_size, "do not smash header"); | |
| 3175 int ins_idx = captured_store_insertion_point(offset, /*size:*/0, phase); | |
| 3176 guarantee(ins_idx != 0, "must re-insert constant store"); | |
| 3177 if (ins_idx < 0) ins_idx = -ins_idx; // never overlap | |
| 3178 if (ins_idx > InitializeNode::RawStores && in(ins_idx-1) == zmem) | |
| 3179 set_req(--ins_idx, st1); | |
| 3180 else | |
| 3181 ins_req(ins_idx, st1); | |
| 3182 } | |
| 3183 } | |
| 3184 | |
| 3185 if (PrintCompilation && WizardMode) | |
| 3186 tty->print_cr("Changed %d/%d subword/long constants into %d/%d int/long", | |
| 3187 old_subword, old_long, new_int, new_long); | |
| 3188 if (C->log() != NULL) | |
| 3189 C->log()->elem("comment that='%d/%d subword/long to %d/%d int/long'", | |
| 3190 old_subword, old_long, new_int, new_long); | |
| 3191 | |
| 3192 // Clean up any remaining occurrences of zmem: | |
| 3193 remove_extra_zeroes(); | |
| 3194 } | |
| 3195 | |
| 3196 // Explore forward from in(start) to find the first fully initialized | |
| 3197 // word, and return its offset. Skip groups of subword stores which | |
| 3198 // together initialize full words. If in(start) is itself part of a | |
| 3199 // fully initialized word, return the offset of in(start). If there | |
| 3200 // are no following full-word stores, or if something is fishy, return | |
| 3201 // a negative value. | |
| 3202 intptr_t InitializeNode::find_next_fullword_store(uint start, PhaseGVN* phase) { | |
| 3203 int int_map = 0; | |
| 3204 intptr_t int_map_off = 0; | |
| 3205 const int FULL_MAP = right_n_bits(BytesPerInt); // the int_map we hope for | |
| 3206 | |
| 3207 for (uint i = start, limit = req(); i < limit; i++) { | |
| 3208 Node* st = in(i); | |
| 3209 | |
| 3210 intptr_t st_off = get_store_offset(st, phase); | |
| 3211 if (st_off < 0) break; // return conservative answer | |
| 3212 | |
| 3213 int st_size = st->as_Store()->memory_size(); | |
| 3214 if (st_size >= BytesPerInt && (st_off % BytesPerInt) == 0) { | |
| 3215 return st_off; // we found a complete word init | |
| 3216 } | |
| 3217 | |
| 3218 // update the map: | |
| 3219 | |
| 3220 intptr_t this_int_off = align_size_down(st_off, BytesPerInt); | |
| 3221 if (this_int_off != int_map_off) { | |
| 3222 // reset the map: | |
| 3223 int_map = 0; | |
| 3224 int_map_off = this_int_off; | |
| 3225 } | |
| 3226 | |
| 3227 int subword_off = st_off - this_int_off; | |
| 3228 int_map |= right_n_bits(st_size) << subword_off; | |
| 3229 if ((int_map & FULL_MAP) == FULL_MAP) { | |
| 3230 return this_int_off; // we found a complete word init | |
| 3231 } | |
| 3232 | |
| 3233 // Did this store hit or cross the word boundary? | |
| 3234 intptr_t next_int_off = align_size_down(st_off + st_size, BytesPerInt); | |
| 3235 if (next_int_off == this_int_off + BytesPerInt) { | |
| 3236 // We passed the current int, without fully initializing it. | |
| 3237 int_map_off = next_int_off; | |
| 3238 int_map >>= BytesPerInt; | |
| 3239 } else if (next_int_off > this_int_off + BytesPerInt) { | |
| 3240 // We passed the current and next int. | |
| 3241 return this_int_off + BytesPerInt; | |
| 3242 } | |
| 3243 } | |
| 3244 | |
| 3245 return -1; | |
| 3246 } | |
| 3247 | |
| 3248 | |
| 3249 // Called when the associated AllocateNode is expanded into CFG. | |
| 3250 // At this point, we may perform additional optimizations. | |
| 3251 // Linearize the stores by ascending offset, to make memory | |
| 3252 // activity as coherent as possible. | |
| 3253 Node* InitializeNode::complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
| 3254 intptr_t header_size, | |
| 3255 Node* size_in_bytes, | |
| 3256 PhaseGVN* phase) { | |
| 3257 assert(!is_complete(), "not already complete"); | |
| 3258 assert(stores_are_sane(phase), ""); | |
| 3259 assert(allocation() != NULL, "must be present"); | |
| 3260 | |
| 3261 remove_extra_zeroes(); | |
| 3262 | |
| 3263 if (ReduceFieldZeroing || ReduceBulkZeroing) | |
| 3264 // reduce instruction count for common initialization patterns | |
| 3265 coalesce_subword_stores(header_size, size_in_bytes, phase); | |
| 3266 | |
| 3267 Node* zmem = zero_memory(); // initially zero memory state | |
| 3268 Node* inits = zmem; // accumulating a linearized chain of inits | |
| 3269 #ifdef ASSERT | |
|
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3270 intptr_t first_offset = allocation()->minimum_header_size(); |
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3271 intptr_t last_init_off = first_offset; // previous init offset |
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3272 intptr_t last_init_end = first_offset; // previous init offset+size |
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3273 intptr_t last_tile_end = first_offset; // previous tile offset+size |
| 0 | 3274 #endif |
| 3275 intptr_t zeroes_done = header_size; | |
| 3276 | |
| 3277 bool do_zeroing = true; // we might give up if inits are very sparse | |
| 3278 int big_init_gaps = 0; // how many large gaps have we seen? | |
| 3279 | |
| 3280 if (ZeroTLAB) do_zeroing = false; | |
| 3281 if (!ReduceFieldZeroing && !ReduceBulkZeroing) do_zeroing = false; | |
| 3282 | |
| 3283 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
| 3284 Node* st = in(i); | |
| 3285 intptr_t st_off = get_store_offset(st, phase); | |
| 3286 if (st_off < 0) | |
| 3287 break; // unknown junk in the inits | |
| 3288 if (st->in(MemNode::Memory) != zmem) | |
| 3289 break; // complicated store chains somehow in list | |
| 3290 | |
| 3291 int st_size = st->as_Store()->memory_size(); | |
| 3292 intptr_t next_init_off = st_off + st_size; | |
| 3293 | |
| 3294 if (do_zeroing && zeroes_done < next_init_off) { | |
| 3295 // See if this store needs a zero before it or under it. | |
| 3296 intptr_t zeroes_needed = st_off; | |
| 3297 | |
| 3298 if (st_size < BytesPerInt) { | |
| 3299 // Look for subword stores which only partially initialize words. | |
| 3300 // If we find some, we must lay down some word-level zeroes first, | |
| 3301 // underneath the subword stores. | |
| 3302 // | |
| 3303 // Examples: | |
| 3304 // byte[] a = { p,q,r,s } => a[0]=p,a[1]=q,a[2]=r,a[3]=s | |
| 3305 // byte[] a = { x,y,0,0 } => a[0..3] = 0, a[0]=x,a[1]=y | |
| 3306 // byte[] a = { 0,0,z,0 } => a[0..3] = 0, a[2]=z | |
| 3307 // | |
| 3308 // Note: coalesce_subword_stores may have already done this, | |
| 3309 // if it was prompted by constant non-zero subword initializers. | |
| 3310 // But this case can still arise with non-constant stores. | |
| 3311 | |
| 3312 intptr_t next_full_store = find_next_fullword_store(i, phase); | |
| 3313 | |
| 3314 // In the examples above: | |
| 3315 // in(i) p q r s x y z | |
| 3316 // st_off 12 13 14 15 12 13 14 | |
| 3317 // st_size 1 1 1 1 1 1 1 | |
| 3318 // next_full_s. 12 16 16 16 16 16 16 | |
| 3319 // z's_done 12 16 16 16 12 16 12 | |
| 3320 // z's_needed 12 16 16 16 16 16 16 | |
| 3321 // zsize 0 0 0 0 4 0 4 | |
| 3322 if (next_full_store < 0) { | |
| 3323 // Conservative tack: Zero to end of current word. | |
| 3324 zeroes_needed = align_size_up(zeroes_needed, BytesPerInt); | |
| 3325 } else { | |
| 3326 // Zero to beginning of next fully initialized word. | |
| 3327 // Or, don't zero at all, if we are already in that word. | |
| 3328 assert(next_full_store >= zeroes_needed, "must go forward"); | |
| 3329 assert((next_full_store & (BytesPerInt-1)) == 0, "even boundary"); | |
| 3330 zeroes_needed = next_full_store; | |
| 3331 } | |
| 3332 } | |
| 3333 | |
| 3334 if (zeroes_needed > zeroes_done) { | |
| 3335 intptr_t zsize = zeroes_needed - zeroes_done; | |
| 3336 // Do some incremental zeroing on rawmem, in parallel with inits. | |
| 3337 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
| 3338 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
| 3339 zeroes_done, zeroes_needed, | |
| 3340 phase); | |
| 3341 zeroes_done = zeroes_needed; | |
| 3342 if (zsize > Matcher::init_array_short_size && ++big_init_gaps > 2) | |
| 3343 do_zeroing = false; // leave the hole, next time | |
| 3344 } | |
| 3345 } | |
| 3346 | |
| 3347 // Collect the store and move on: | |
| 3348 st->set_req(MemNode::Memory, inits); | |
| 3349 inits = st; // put it on the linearized chain | |
| 3350 set_req(i, zmem); // unhook from previous position | |
| 3351 | |
| 3352 if (zeroes_done == st_off) | |
| 3353 zeroes_done = next_init_off; | |
| 3354 | |
| 3355 assert(!do_zeroing || zeroes_done >= next_init_off, "don't miss any"); | |
| 3356 | |
| 3357 #ifdef ASSERT | |
| 3358 // Various order invariants. Weaker than stores_are_sane because | |
| 3359 // a large constant tile can be filled in by smaller non-constant stores. | |
| 3360 assert(st_off >= last_init_off, "inits do not reverse"); | |
| 3361 last_init_off = st_off; | |
| 3362 const Type* val = NULL; | |
| 3363 if (st_size >= BytesPerInt && | |
| 3364 (val = phase->type(st->in(MemNode::ValueIn)))->singleton() && | |
| 3365 (int)val->basic_type() < (int)T_OBJECT) { | |
| 3366 assert(st_off >= last_tile_end, "tiles do not overlap"); | |
| 3367 assert(st_off >= last_init_end, "tiles do not overwrite inits"); | |
| 3368 last_tile_end = MAX2(last_tile_end, next_init_off); | |
| 3369 } else { | |
| 3370 intptr_t st_tile_end = align_size_up(next_init_off, BytesPerLong); | |
| 3371 assert(st_tile_end >= last_tile_end, "inits stay with tiles"); | |
| 3372 assert(st_off >= last_init_end, "inits do not overlap"); | |
| 3373 last_init_end = next_init_off; // it's a non-tile | |
| 3374 } | |
| 3375 #endif //ASSERT | |
| 3376 } | |
| 3377 | |
| 3378 remove_extra_zeroes(); // clear out all the zmems left over | |
| 3379 add_req(inits); | |
| 3380 | |
| 3381 if (!ZeroTLAB) { | |
| 3382 // If anything remains to be zeroed, zero it all now. | |
| 3383 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
| 3384 // if it is the last unused 4 bytes of an instance, forget about it | |
| 3385 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint); | |
| 3386 if (zeroes_done + BytesPerLong >= size_limit) { | |
| 3387 assert(allocation() != NULL, ""); | |
| 3388 Node* klass_node = allocation()->in(AllocateNode::KlassNode); | |
| 3389 ciKlass* k = phase->type(klass_node)->is_klassptr()->klass(); | |
| 3390 if (zeroes_done == k->layout_helper()) | |
| 3391 zeroes_done = size_limit; | |
| 3392 } | |
| 3393 if (zeroes_done < size_limit) { | |
| 3394 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
| 3395 zeroes_done, size_in_bytes, phase); | |
| 3396 } | |
| 3397 } | |
| 3398 | |
| 3399 set_complete(phase); | |
| 3400 return rawmem; | |
| 3401 } | |
| 3402 | |
| 3403 | |
| 3404 #ifdef ASSERT | |
| 3405 bool InitializeNode::stores_are_sane(PhaseTransform* phase) { | |
| 3406 if (is_complete()) | |
| 3407 return true; // stores could be anything at this point | |
|
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coleenp
parents:
82
diff
changeset
|
3408 assert(allocation() != NULL, "must be present"); |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
82
diff
changeset
|
3409 intptr_t last_off = allocation()->minimum_header_size(); |
| 0 | 3410 for (uint i = InitializeNode::RawStores; i < req(); i++) { |
| 3411 Node* st = in(i); | |
| 3412 intptr_t st_off = get_store_offset(st, phase); | |
| 3413 if (st_off < 0) continue; // ignore dead garbage | |
| 3414 if (last_off > st_off) { | |
| 3415 tty->print_cr("*** bad store offset at %d: %d > %d", i, last_off, st_off); | |
| 3416 this->dump(2); | |
| 3417 assert(false, "ascending store offsets"); | |
| 3418 return false; | |
| 3419 } | |
| 3420 last_off = st_off + st->as_Store()->memory_size(); | |
| 3421 } | |
| 3422 return true; | |
| 3423 } | |
| 3424 #endif //ASSERT | |
| 3425 | |
| 3426 | |
| 3427 | |
| 3428 | |
| 3429 //============================MergeMemNode===================================== | |
| 3430 // | |
| 3431 // SEMANTICS OF MEMORY MERGES: A MergeMem is a memory state assembled from several | |
| 3432 // contributing store or call operations. Each contributor provides the memory | |
| 3433 // state for a particular "alias type" (see Compile::alias_type). For example, | |
| 3434 // if a MergeMem has an input X for alias category #6, then any memory reference | |
| 3435 // to alias category #6 may use X as its memory state input, as an exact equivalent | |
| 3436 // to using the MergeMem as a whole. | |
| 3437 // Load<6>( MergeMem(<6>: X, ...), p ) <==> Load<6>(X,p) | |
| 3438 // | |
| 3439 // (Here, the <N> notation gives the index of the relevant adr_type.) | |
| 3440 // | |
| 3441 // In one special case (and more cases in the future), alias categories overlap. | |
| 3442 // The special alias category "Bot" (Compile::AliasIdxBot) includes all memory | |
| 3443 // states. Therefore, if a MergeMem has only one contributing input W for Bot, | |
| 3444 // it is exactly equivalent to that state W: | |
| 3445 // MergeMem(<Bot>: W) <==> W | |
| 3446 // | |
| 3447 // Usually, the merge has more than one input. In that case, where inputs | |
| 3448 // overlap (i.e., one is Bot), the narrower alias type determines the memory | |
| 3449 // state for that type, and the wider alias type (Bot) fills in everywhere else: | |
| 3450 // Load<5>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<5>(W,p) | |
| 3451 // Load<6>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<6>(X,p) | |
| 3452 // | |
| 3453 // A merge can take a "wide" memory state as one of its narrow inputs. | |
| 3454 // This simply means that the merge observes out only the relevant parts of | |
| 3455 // the wide input. That is, wide memory states arriving at narrow merge inputs | |
| 3456 // are implicitly "filtered" or "sliced" as necessary. (This is rare.) | |
| 3457 // | |
| 3458 // These rules imply that MergeMem nodes may cascade (via their <Bot> links), | |
| 3459 // and that memory slices "leak through": | |
| 3460 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y)) <==> MergeMem(<Bot>: W, <7>: Y) | |
| 3461 // | |
| 3462 // But, in such a cascade, repeated memory slices can "block the leak": | |
| 3463 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y), <7>: Y') <==> MergeMem(<Bot>: W, <7>: Y') | |
| 3464 // | |
| 3465 // In the last example, Y is not part of the combined memory state of the | |
| 3466 // outermost MergeMem. The system must, of course, prevent unschedulable | |
| 3467 // memory states from arising, so you can be sure that the state Y is somehow | |
| 3468 // a precursor to state Y'. | |
| 3469 // | |
| 3470 // | |
| 3471 // REPRESENTATION OF MEMORY MERGES: The indexes used to address the Node::in array | |
| 3472 // of each MergeMemNode array are exactly the numerical alias indexes, including | |
| 3473 // but not limited to AliasIdxTop, AliasIdxBot, and AliasIdxRaw. The functions | |
| 3474 // Compile::alias_type (and kin) produce and manage these indexes. | |
| 3475 // | |
| 3476 // By convention, the value of in(AliasIdxTop) (i.e., in(1)) is always the top node. | |
| 3477 // (Note that this provides quick access to the top node inside MergeMem methods, | |
| 3478 // without the need to reach out via TLS to Compile::current.) | |
| 3479 // | |
| 3480 // As a consequence of what was just described, a MergeMem that represents a full | |
| 3481 // memory state has an edge in(AliasIdxBot) which is a "wide" memory state, | |
| 3482 // containing all alias categories. | |
| 3483 // | |
| 3484 // MergeMem nodes never (?) have control inputs, so in(0) is NULL. | |
| 3485 // | |
| 3486 // All other edges in(N) (including in(AliasIdxRaw), which is in(3)) are either | |
| 3487 // a memory state for the alias type <N>, or else the top node, meaning that | |
| 3488 // there is no particular input for that alias type. Note that the length of | |
| 3489 // a MergeMem is variable, and may be extended at any time to accommodate new | |
| 3490 // memory states at larger alias indexes. When merges grow, they are of course | |
| 3491 // filled with "top" in the unused in() positions. | |
| 3492 // | |
| 3493 // This use of top is named "empty_memory()", or "empty_mem" (no-memory) as a variable. | |
| 3494 // (Top was chosen because it works smoothly with passes like GCM.) | |
| 3495 // | |
| 3496 // For convenience, we hardwire the alias index for TypeRawPtr::BOTTOM. (It is | |
| 3497 // the type of random VM bits like TLS references.) Since it is always the | |
| 3498 // first non-Bot memory slice, some low-level loops use it to initialize an | |
| 3499 // index variable: for (i = AliasIdxRaw; i < req(); i++). | |
| 3500 // | |
| 3501 // | |
| 3502 // ACCESSORS: There is a special accessor MergeMemNode::base_memory which returns | |
| 3503 // the distinguished "wide" state. The accessor MergeMemNode::memory_at(N) returns | |
| 3504 // the memory state for alias type <N>, or (if there is no particular slice at <N>, | |
| 3505 // it returns the base memory. To prevent bugs, memory_at does not accept <Top> | |
| 3506 // or <Bot> indexes. The iterator MergeMemStream provides robust iteration over | |
| 3507 // MergeMem nodes or pairs of such nodes, ensuring that the non-top edges are visited. | |
| 3508 // | |
| 3509 // %%%% We may get rid of base_memory as a separate accessor at some point; it isn't | |
| 3510 // really that different from the other memory inputs. An abbreviation called | |
| 3511 // "bot_memory()" for "memory_at(AliasIdxBot)" would keep code tidy. | |
| 3512 // | |
| 3513 // | |
| 3514 // PARTIAL MEMORY STATES: During optimization, MergeMem nodes may arise that represent | |
| 3515 // partial memory states. When a Phi splits through a MergeMem, the copy of the Phi | |
| 3516 // that "emerges though" the base memory will be marked as excluding the alias types | |
| 3517 // of the other (narrow-memory) copies which "emerged through" the narrow edges: | |
| 3518 // | |
| 3519 // Phi<Bot>(U, MergeMem(<Bot>: W, <8>: Y)) | |
| 3520 // ==Ideal=> MergeMem(<Bot>: Phi<Bot-8>(U, W), Phi<8>(U, Y)) | |
| 3521 // | |
| 3522 // This strange "subtraction" effect is necessary to ensure IGVN convergence. | |
| 3523 // (It is currently unimplemented.) As you can see, the resulting merge is | |
| 3524 // actually a disjoint union of memory states, rather than an overlay. | |
| 3525 // | |
| 3526 | |
| 3527 //------------------------------MergeMemNode----------------------------------- | |
| 3528 Node* MergeMemNode::make_empty_memory() { | |
| 3529 Node* empty_memory = (Node*) Compile::current()->top(); | |
| 3530 assert(empty_memory->is_top(), "correct sentinel identity"); | |
| 3531 return empty_memory; | |
| 3532 } | |
| 3533 | |
| 3534 MergeMemNode::MergeMemNode(Node *new_base) : Node(1+Compile::AliasIdxRaw) { | |
| 3535 init_class_id(Class_MergeMem); | |
| 3536 // all inputs are nullified in Node::Node(int) | |
| 3537 // set_input(0, NULL); // no control input | |
| 3538 | |
| 3539 // Initialize the edges uniformly to top, for starters. | |
| 3540 Node* empty_mem = make_empty_memory(); | |
| 3541 for (uint i = Compile::AliasIdxTop; i < req(); i++) { | |
| 3542 init_req(i,empty_mem); | |
| 3543 } | |
| 3544 assert(empty_memory() == empty_mem, ""); | |
| 3545 | |
| 3546 if( new_base != NULL && new_base->is_MergeMem() ) { | |
| 3547 MergeMemNode* mdef = new_base->as_MergeMem(); | |
| 3548 assert(mdef->empty_memory() == empty_mem, "consistent sentinels"); | |
| 3549 for (MergeMemStream mms(this, mdef); mms.next_non_empty2(); ) { | |
| 3550 mms.set_memory(mms.memory2()); | |
| 3551 } | |
| 3552 assert(base_memory() == mdef->base_memory(), ""); | |
| 3553 } else { | |
| 3554 set_base_memory(new_base); | |
| 3555 } | |
| 3556 } | |
| 3557 | |
| 3558 // Make a new, untransformed MergeMem with the same base as 'mem'. | |
| 3559 // If mem is itself a MergeMem, populate the result with the same edges. | |
| 3560 MergeMemNode* MergeMemNode::make(Compile* C, Node* mem) { | |
| 3561 return new(C, 1+Compile::AliasIdxRaw) MergeMemNode(mem); | |
| 3562 } | |
| 3563 | |
| 3564 //------------------------------cmp-------------------------------------------- | |
| 3565 uint MergeMemNode::hash() const { return NO_HASH; } | |
| 3566 uint MergeMemNode::cmp( const Node &n ) const { | |
| 3567 return (&n == this); // Always fail except on self | |
| 3568 } | |
| 3569 | |
| 3570 //------------------------------Identity--------------------------------------- | |
| 3571 Node* MergeMemNode::Identity(PhaseTransform *phase) { | |
| 3572 // Identity if this merge point does not record any interesting memory | |
| 3573 // disambiguations. | |
| 3574 Node* base_mem = base_memory(); | |
| 3575 Node* empty_mem = empty_memory(); | |
| 3576 if (base_mem != empty_mem) { // Memory path is not dead? | |
| 3577 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 3578 Node* mem = in(i); | |
| 3579 if (mem != empty_mem && mem != base_mem) { | |
| 3580 return this; // Many memory splits; no change | |
| 3581 } | |
| 3582 } | |
| 3583 } | |
| 3584 return base_mem; // No memory splits; ID on the one true input | |
| 3585 } | |
| 3586 | |
| 3587 //------------------------------Ideal------------------------------------------ | |
| 3588 // This method is invoked recursively on chains of MergeMem nodes | |
| 3589 Node *MergeMemNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 3590 // Remove chain'd MergeMems | |
| 3591 // | |
| 3592 // This is delicate, because the each "in(i)" (i >= Raw) is interpreted | |
| 3593 // relative to the "in(Bot)". Since we are patching both at the same time, | |
| 3594 // we have to be careful to read each "in(i)" relative to the old "in(Bot)", | |
| 3595 // but rewrite each "in(i)" relative to the new "in(Bot)". | |
| 3596 Node *progress = NULL; | |
| 3597 | |
| 3598 | |
| 3599 Node* old_base = base_memory(); | |
| 3600 Node* empty_mem = empty_memory(); | |
| 3601 if (old_base == empty_mem) | |
| 3602 return NULL; // Dead memory path. | |
| 3603 | |
| 3604 MergeMemNode* old_mbase; | |
| 3605 if (old_base != NULL && old_base->is_MergeMem()) | |
| 3606 old_mbase = old_base->as_MergeMem(); | |
| 3607 else | |
| 3608 old_mbase = NULL; | |
| 3609 Node* new_base = old_base; | |
| 3610 | |
| 3611 // simplify stacked MergeMems in base memory | |
| 3612 if (old_mbase) new_base = old_mbase->base_memory(); | |
| 3613 | |
| 3614 // the base memory might contribute new slices beyond my req() | |
| 3615 if (old_mbase) grow_to_match(old_mbase); | |
| 3616 | |
| 3617 // Look carefully at the base node if it is a phi. | |
| 3618 PhiNode* phi_base; | |
| 3619 if (new_base != NULL && new_base->is_Phi()) | |
| 3620 phi_base = new_base->as_Phi(); | |
| 3621 else | |
| 3622 phi_base = NULL; | |
| 3623 | |
| 3624 Node* phi_reg = NULL; | |
| 3625 uint phi_len = (uint)-1; | |
| 3626 if (phi_base != NULL && !phi_base->is_copy()) { | |
| 3627 // do not examine phi if degraded to a copy | |
| 3628 phi_reg = phi_base->region(); | |
| 3629 phi_len = phi_base->req(); | |
| 3630 // see if the phi is unfinished | |
| 3631 for (uint i = 1; i < phi_len; i++) { | |
| 3632 if (phi_base->in(i) == NULL) { | |
| 3633 // incomplete phi; do not look at it yet! | |
| 3634 phi_reg = NULL; | |
| 3635 phi_len = (uint)-1; | |
| 3636 break; | |
| 3637 } | |
| 3638 } | |
| 3639 } | |
| 3640 | |
| 3641 // Note: We do not call verify_sparse on entry, because inputs | |
| 3642 // can normalize to the base_memory via subsume_node or similar | |
| 3643 // mechanisms. This method repairs that damage. | |
| 3644 | |
| 3645 assert(!old_mbase || old_mbase->is_empty_memory(empty_mem), "consistent sentinels"); | |
| 3646 | |
| 3647 // Look at each slice. | |
| 3648 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 3649 Node* old_in = in(i); | |
| 3650 // calculate the old memory value | |
| 3651 Node* old_mem = old_in; | |
| 3652 if (old_mem == empty_mem) old_mem = old_base; | |
| 3653 assert(old_mem == memory_at(i), ""); | |
| 3654 | |
| 3655 // maybe update (reslice) the old memory value | |
| 3656 | |
| 3657 // simplify stacked MergeMems | |
| 3658 Node* new_mem = old_mem; | |
| 3659 MergeMemNode* old_mmem; | |
| 3660 if (old_mem != NULL && old_mem->is_MergeMem()) | |
| 3661 old_mmem = old_mem->as_MergeMem(); | |
| 3662 else | |
| 3663 old_mmem = NULL; | |
| 3664 if (old_mmem == this) { | |
| 3665 // This can happen if loops break up and safepoints disappear. | |
| 3666 // A merge of BotPtr (default) with a RawPtr memory derived from a | |
| 3667 // safepoint can be rewritten to a merge of the same BotPtr with | |
| 3668 // the BotPtr phi coming into the loop. If that phi disappears | |
| 3669 // also, we can end up with a self-loop of the mergemem. | |
| 3670 // In general, if loops degenerate and memory effects disappear, | |
| 3671 // a mergemem can be left looking at itself. This simply means | |
| 3672 // that the mergemem's default should be used, since there is | |
| 3673 // no longer any apparent effect on this slice. | |
| 3674 // Note: If a memory slice is a MergeMem cycle, it is unreachable | |
| 3675 // from start. Update the input to TOP. | |
| 3676 new_mem = (new_base == this || new_base == empty_mem)? empty_mem : new_base; | |
| 3677 } | |
| 3678 else if (old_mmem != NULL) { | |
| 3679 new_mem = old_mmem->memory_at(i); | |
| 3680 } | |
| 3681 // else preceeding memory was not a MergeMem | |
| 3682 | |
| 3683 // replace equivalent phis (unfortunately, they do not GVN together) | |
| 3684 if (new_mem != NULL && new_mem != new_base && | |
| 3685 new_mem->req() == phi_len && new_mem->in(0) == phi_reg) { | |
| 3686 if (new_mem->is_Phi()) { | |
| 3687 PhiNode* phi_mem = new_mem->as_Phi(); | |
| 3688 for (uint i = 1; i < phi_len; i++) { | |
| 3689 if (phi_base->in(i) != phi_mem->in(i)) { | |
| 3690 phi_mem = NULL; | |
| 3691 break; | |
| 3692 } | |
| 3693 } | |
| 3694 if (phi_mem != NULL) { | |
| 3695 // equivalent phi nodes; revert to the def | |
| 3696 new_mem = new_base; | |
| 3697 } | |
| 3698 } | |
| 3699 } | |
| 3700 | |
| 3701 // maybe store down a new value | |
| 3702 Node* new_in = new_mem; | |
| 3703 if (new_in == new_base) new_in = empty_mem; | |
| 3704 | |
| 3705 if (new_in != old_in) { | |
| 3706 // Warning: Do not combine this "if" with the previous "if" | |
| 3707 // A memory slice might have be be rewritten even if it is semantically | |
| 3708 // unchanged, if the base_memory value has changed. | |
| 3709 set_req(i, new_in); | |
| 3710 progress = this; // Report progress | |
| 3711 } | |
| 3712 } | |
| 3713 | |
| 3714 if (new_base != old_base) { | |
| 3715 set_req(Compile::AliasIdxBot, new_base); | |
| 3716 // Don't use set_base_memory(new_base), because we need to update du. | |
| 3717 assert(base_memory() == new_base, ""); | |
| 3718 progress = this; | |
| 3719 } | |
| 3720 | |
| 3721 if( base_memory() == this ) { | |
| 3722 // a self cycle indicates this memory path is dead | |
| 3723 set_req(Compile::AliasIdxBot, empty_mem); | |
| 3724 } | |
| 3725 | |
| 3726 // Resolve external cycles by calling Ideal on a MergeMem base_memory | |
| 3727 // Recursion must occur after the self cycle check above | |
| 3728 if( base_memory()->is_MergeMem() ) { | |
| 3729 MergeMemNode *new_mbase = base_memory()->as_MergeMem(); | |
| 3730 Node *m = phase->transform(new_mbase); // Rollup any cycles | |
| 3731 if( m != NULL && (m->is_top() || | |
| 3732 m->is_MergeMem() && m->as_MergeMem()->base_memory() == empty_mem) ) { | |
| 3733 // propagate rollup of dead cycle to self | |
| 3734 set_req(Compile::AliasIdxBot, empty_mem); | |
| 3735 } | |
| 3736 } | |
| 3737 | |
| 3738 if( base_memory() == empty_mem ) { | |
| 3739 progress = this; | |
| 3740 // Cut inputs during Parse phase only. | |
| 3741 // During Optimize phase a dead MergeMem node will be subsumed by Top. | |
| 3742 if( !can_reshape ) { | |
| 3743 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 3744 if( in(i) != empty_mem ) { set_req(i, empty_mem); } | |
| 3745 } | |
| 3746 } | |
| 3747 } | |
| 3748 | |
| 3749 if( !progress && base_memory()->is_Phi() && can_reshape ) { | |
| 3750 // Check if PhiNode::Ideal's "Split phis through memory merges" | |
| 3751 // transform should be attempted. Look for this->phi->this cycle. | |
| 3752 uint merge_width = req(); | |
| 3753 if (merge_width > Compile::AliasIdxRaw) { | |
| 3754 PhiNode* phi = base_memory()->as_Phi(); | |
| 3755 for( uint i = 1; i < phi->req(); ++i ) {// For all paths in | |
| 3756 if (phi->in(i) == this) { | |
| 3757 phase->is_IterGVN()->_worklist.push(phi); | |
| 3758 break; | |
| 3759 } | |
| 3760 } | |
| 3761 } | |
| 3762 } | |
| 3763 | |
|
64
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parents:
43
diff
changeset
|
3764 assert(progress || verify_sparse(), "please, no dups of base"); |
| 0 | 3765 return progress; |
| 3766 } | |
| 3767 | |
| 3768 //-------------------------set_base_memory------------------------------------- | |
| 3769 void MergeMemNode::set_base_memory(Node *new_base) { | |
| 3770 Node* empty_mem = empty_memory(); | |
| 3771 set_req(Compile::AliasIdxBot, new_base); | |
| 3772 assert(memory_at(req()) == new_base, "must set default memory"); | |
| 3773 // Clear out other occurrences of new_base: | |
| 3774 if (new_base != empty_mem) { | |
| 3775 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 3776 if (in(i) == new_base) set_req(i, empty_mem); | |
| 3777 } | |
| 3778 } | |
| 3779 } | |
| 3780 | |
| 3781 //------------------------------out_RegMask------------------------------------ | |
| 3782 const RegMask &MergeMemNode::out_RegMask() const { | |
| 3783 return RegMask::Empty; | |
| 3784 } | |
| 3785 | |
| 3786 //------------------------------dump_spec-------------------------------------- | |
| 3787 #ifndef PRODUCT | |
| 3788 void MergeMemNode::dump_spec(outputStream *st) const { | |
| 3789 st->print(" {"); | |
| 3790 Node* base_mem = base_memory(); | |
| 3791 for( uint i = Compile::AliasIdxRaw; i < req(); i++ ) { | |
| 3792 Node* mem = memory_at(i); | |
| 3793 if (mem == base_mem) { st->print(" -"); continue; } | |
| 3794 st->print( " N%d:", mem->_idx ); | |
| 3795 Compile::current()->get_adr_type(i)->dump_on(st); | |
| 3796 } | |
| 3797 st->print(" }"); | |
| 3798 } | |
| 3799 #endif // !PRODUCT | |
| 3800 | |
| 3801 | |
| 3802 #ifdef ASSERT | |
| 3803 static bool might_be_same(Node* a, Node* b) { | |
| 3804 if (a == b) return true; | |
| 3805 if (!(a->is_Phi() || b->is_Phi())) return false; | |
| 3806 // phis shift around during optimization | |
| 3807 return true; // pretty stupid... | |
| 3808 } | |
| 3809 | |
| 3810 // verify a narrow slice (either incoming or outgoing) | |
| 3811 static void verify_memory_slice(const MergeMemNode* m, int alias_idx, Node* n) { | |
| 3812 if (!VerifyAliases) return; // don't bother to verify unless requested | |
| 3813 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
| 3814 if (Node::in_dump()) return; // muzzle asserts when printing | |
| 3815 assert(alias_idx >= Compile::AliasIdxRaw, "must not disturb base_memory or sentinel"); | |
| 3816 assert(n != NULL, ""); | |
| 3817 // Elide intervening MergeMem's | |
| 3818 while (n->is_MergeMem()) { | |
| 3819 n = n->as_MergeMem()->memory_at(alias_idx); | |
| 3820 } | |
| 3821 Compile* C = Compile::current(); | |
| 3822 const TypePtr* n_adr_type = n->adr_type(); | |
| 3823 if (n == m->empty_memory()) { | |
| 3824 // Implicit copy of base_memory() | |
| 3825 } else if (n_adr_type != TypePtr::BOTTOM) { | |
| 3826 assert(n_adr_type != NULL, "new memory must have a well-defined adr_type"); | |
| 3827 assert(C->must_alias(n_adr_type, alias_idx), "new memory must match selected slice"); | |
| 3828 } else { | |
| 3829 // A few places like make_runtime_call "know" that VM calls are narrow, | |
| 3830 // and can be used to update only the VM bits stored as TypeRawPtr::BOTTOM. | |
| 3831 bool expected_wide_mem = false; | |
| 3832 if (n == m->base_memory()) { | |
| 3833 expected_wide_mem = true; | |
| 3834 } else if (alias_idx == Compile::AliasIdxRaw || | |
| 3835 n == m->memory_at(Compile::AliasIdxRaw)) { | |
| 3836 expected_wide_mem = true; | |
| 3837 } else if (!C->alias_type(alias_idx)->is_rewritable()) { | |
| 3838 // memory can "leak through" calls on channels that | |
| 3839 // are write-once. Allow this also. | |
| 3840 expected_wide_mem = true; | |
| 3841 } | |
| 3842 assert(expected_wide_mem, "expected narrow slice replacement"); | |
| 3843 } | |
| 3844 } | |
| 3845 #else // !ASSERT | |
| 3846 #define verify_memory_slice(m,i,n) (0) // PRODUCT version is no-op | |
| 3847 #endif | |
| 3848 | |
| 3849 | |
| 3850 //-----------------------------memory_at--------------------------------------- | |
| 3851 Node* MergeMemNode::memory_at(uint alias_idx) const { | |
| 3852 assert(alias_idx >= Compile::AliasIdxRaw || | |
| 3853 alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, | |
| 3854 "must avoid base_memory and AliasIdxTop"); | |
| 3855 | |
| 3856 // Otherwise, it is a narrow slice. | |
| 3857 Node* n = alias_idx < req() ? in(alias_idx) : empty_memory(); | |
| 3858 Compile *C = Compile::current(); | |
| 3859 if (is_empty_memory(n)) { | |
| 3860 // the array is sparse; empty slots are the "top" node | |
| 3861 n = base_memory(); | |
| 3862 assert(Node::in_dump() | |
| 3863 || n == NULL || n->bottom_type() == Type::TOP | |
| 3864 || n->adr_type() == TypePtr::BOTTOM | |
| 3865 || n->adr_type() == TypeRawPtr::BOTTOM | |
| 3866 || Compile::current()->AliasLevel() == 0, | |
| 3867 "must be a wide memory"); | |
| 3868 // AliasLevel == 0 if we are organizing the memory states manually. | |
| 3869 // See verify_memory_slice for comments on TypeRawPtr::BOTTOM. | |
| 3870 } else { | |
| 3871 // make sure the stored slice is sane | |
| 3872 #ifdef ASSERT | |
| 3873 if (is_error_reported() || Node::in_dump()) { | |
| 3874 } else if (might_be_same(n, base_memory())) { | |
| 3875 // Give it a pass: It is a mostly harmless repetition of the base. | |
| 3876 // This can arise normally from node subsumption during optimization. | |
| 3877 } else { | |
| 3878 verify_memory_slice(this, alias_idx, n); | |
| 3879 } | |
| 3880 #endif | |
| 3881 } | |
| 3882 return n; | |
| 3883 } | |
| 3884 | |
| 3885 //---------------------------set_memory_at------------------------------------- | |
| 3886 void MergeMemNode::set_memory_at(uint alias_idx, Node *n) { | |
| 3887 verify_memory_slice(this, alias_idx, n); | |
| 3888 Node* empty_mem = empty_memory(); | |
| 3889 if (n == base_memory()) n = empty_mem; // collapse default | |
| 3890 uint need_req = alias_idx+1; | |
| 3891 if (req() < need_req) { | |
| 3892 if (n == empty_mem) return; // already the default, so do not grow me | |
| 3893 // grow the sparse array | |
| 3894 do { | |
| 3895 add_req(empty_mem); | |
| 3896 } while (req() < need_req); | |
| 3897 } | |
| 3898 set_req( alias_idx, n ); | |
| 3899 } | |
| 3900 | |
| 3901 | |
| 3902 | |
| 3903 //--------------------------iteration_setup------------------------------------ | |
| 3904 void MergeMemNode::iteration_setup(const MergeMemNode* other) { | |
| 3905 if (other != NULL) { | |
| 3906 grow_to_match(other); | |
| 3907 // invariant: the finite support of mm2 is within mm->req() | |
| 3908 #ifdef ASSERT | |
| 3909 for (uint i = req(); i < other->req(); i++) { | |
| 3910 assert(other->is_empty_memory(other->in(i)), "slice left uncovered"); | |
| 3911 } | |
| 3912 #endif | |
| 3913 } | |
| 3914 // Replace spurious copies of base_memory by top. | |
| 3915 Node* base_mem = base_memory(); | |
| 3916 if (base_mem != NULL && !base_mem->is_top()) { | |
| 3917 for (uint i = Compile::AliasIdxBot+1, imax = req(); i < imax; i++) { | |
| 3918 if (in(i) == base_mem) | |
| 3919 set_req(i, empty_memory()); | |
| 3920 } | |
| 3921 } | |
| 3922 } | |
| 3923 | |
| 3924 //---------------------------grow_to_match------------------------------------- | |
| 3925 void MergeMemNode::grow_to_match(const MergeMemNode* other) { | |
| 3926 Node* empty_mem = empty_memory(); | |
| 3927 assert(other->is_empty_memory(empty_mem), "consistent sentinels"); | |
| 3928 // look for the finite support of the other memory | |
| 3929 for (uint i = other->req(); --i >= req(); ) { | |
| 3930 if (other->in(i) != empty_mem) { | |
| 3931 uint new_len = i+1; | |
| 3932 while (req() < new_len) add_req(empty_mem); | |
| 3933 break; | |
| 3934 } | |
| 3935 } | |
| 3936 } | |
| 3937 | |
| 3938 //---------------------------verify_sparse------------------------------------- | |
| 3939 #ifndef PRODUCT | |
| 3940 bool MergeMemNode::verify_sparse() const { | |
| 3941 assert(is_empty_memory(make_empty_memory()), "sane sentinel"); | |
| 3942 Node* base_mem = base_memory(); | |
| 3943 // The following can happen in degenerate cases, since empty==top. | |
| 3944 if (is_empty_memory(base_mem)) return true; | |
| 3945 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
| 3946 assert(in(i) != NULL, "sane slice"); | |
| 3947 if (in(i) == base_mem) return false; // should have been the sentinel value! | |
| 3948 } | |
| 3949 return true; | |
| 3950 } | |
| 3951 | |
| 3952 bool MergeMemStream::match_memory(Node* mem, const MergeMemNode* mm, int idx) { | |
| 3953 Node* n; | |
| 3954 n = mm->in(idx); | |
| 3955 if (mem == n) return true; // might be empty_memory() | |
| 3956 n = (idx == Compile::AliasIdxBot)? mm->base_memory(): mm->memory_at(idx); | |
| 3957 if (mem == n) return true; | |
| 3958 while (n->is_Phi() && (n = n->as_Phi()->is_copy()) != NULL) { | |
| 3959 if (mem == n) return true; | |
| 3960 if (n == NULL) break; | |
| 3961 } | |
| 3962 return false; | |
| 3963 } | |
| 3964 #endif // !PRODUCT |