Mercurial > hg > truffle
annotate src/share/vm/opto/memnode.cpp @ 4779:c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
Summary: Don't split CMove node if it's control edge is different from split region.
Reviewed-by: never
author | kvn |
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date | Thu, 12 Jan 2012 12:28:59 -0800 |
parents | 35acf8f0a2e4 |
children | 53a127075045 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "compiler/compileLog.hpp" | |
28 #include "memory/allocation.inline.hpp" | |
29 #include "oops/objArrayKlass.hpp" | |
30 #include "opto/addnode.hpp" | |
31 #include "opto/cfgnode.hpp" | |
32 #include "opto/compile.hpp" | |
33 #include "opto/connode.hpp" | |
34 #include "opto/loopnode.hpp" | |
35 #include "opto/machnode.hpp" | |
36 #include "opto/matcher.hpp" | |
37 #include "opto/memnode.hpp" | |
38 #include "opto/mulnode.hpp" | |
39 #include "opto/phaseX.hpp" | |
40 #include "opto/regmask.hpp" | |
41 | |
0 | 42 // Portions of code courtesy of Clifford Click |
43 | |
44 // Optimization - Graph Style | |
45 | |
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46 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st); |
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47 |
0 | 48 //============================================================================= |
49 uint MemNode::size_of() const { return sizeof(*this); } | |
50 | |
51 const TypePtr *MemNode::adr_type() const { | |
52 Node* adr = in(Address); | |
53 const TypePtr* cross_check = NULL; | |
54 DEBUG_ONLY(cross_check = _adr_type); | |
55 return calculate_adr_type(adr->bottom_type(), cross_check); | |
56 } | |
57 | |
58 #ifndef PRODUCT | |
59 void MemNode::dump_spec(outputStream *st) const { | |
60 if (in(Address) == NULL) return; // node is dead | |
61 #ifndef ASSERT | |
62 // fake the missing field | |
63 const TypePtr* _adr_type = NULL; | |
64 if (in(Address) != NULL) | |
65 _adr_type = in(Address)->bottom_type()->isa_ptr(); | |
66 #endif | |
67 dump_adr_type(this, _adr_type, st); | |
68 | |
69 Compile* C = Compile::current(); | |
70 if( C->alias_type(_adr_type)->is_volatile() ) | |
71 st->print(" Volatile!"); | |
72 } | |
73 | |
74 void MemNode::dump_adr_type(const Node* mem, const TypePtr* adr_type, outputStream *st) { | |
75 st->print(" @"); | |
76 if (adr_type == NULL) { | |
77 st->print("NULL"); | |
78 } else { | |
79 adr_type->dump_on(st); | |
80 Compile* C = Compile::current(); | |
81 Compile::AliasType* atp = NULL; | |
82 if (C->have_alias_type(adr_type)) atp = C->alias_type(adr_type); | |
83 if (atp == NULL) | |
84 st->print(", idx=?\?;"); | |
85 else if (atp->index() == Compile::AliasIdxBot) | |
86 st->print(", idx=Bot;"); | |
87 else if (atp->index() == Compile::AliasIdxTop) | |
88 st->print(", idx=Top;"); | |
89 else if (atp->index() == Compile::AliasIdxRaw) | |
90 st->print(", idx=Raw;"); | |
91 else { | |
92 ciField* field = atp->field(); | |
93 if (field) { | |
94 st->print(", name="); | |
95 field->print_name_on(st); | |
96 } | |
97 st->print(", idx=%d;", atp->index()); | |
98 } | |
99 } | |
100 } | |
101 | |
102 extern void print_alias_types(); | |
103 | |
104 #endif | |
105 | |
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106 Node *MemNode::optimize_simple_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase) { |
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107 const TypeOopPtr *tinst = t_adr->isa_oopptr(); |
223 | 108 if (tinst == NULL || !tinst->is_known_instance_field()) |
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109 return mchain; // don't try to optimize non-instance types |
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110 uint instance_id = tinst->instance_id(); |
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111 Node *start_mem = phase->C->start()->proj_out(TypeFunc::Memory); |
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112 Node *prev = NULL; |
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113 Node *result = mchain; |
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114 while (prev != result) { |
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115 prev = result; |
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116 if (result == start_mem) |
605 | 117 break; // hit one of our sentinels |
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118 // skip over a call which does not affect this memory slice |
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119 if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) { |
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120 Node *proj_in = result->in(0); |
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121 if (proj_in->is_Allocate() && proj_in->_idx == instance_id) { |
605 | 122 break; // hit one of our sentinels |
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123 } else if (proj_in->is_Call()) { |
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124 CallNode *call = proj_in->as_Call(); |
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125 if (!call->may_modify(t_adr, phase)) { |
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126 result = call->in(TypeFunc::Memory); |
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127 } |
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128 } else if (proj_in->is_Initialize()) { |
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129 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); |
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130 // Stop if this is the initialization for the object instance which |
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131 // which contains this memory slice, otherwise skip over it. |
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132 if (alloc != NULL && alloc->_idx != instance_id) { |
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133 result = proj_in->in(TypeFunc::Memory); |
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134 } |
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135 } else if (proj_in->is_MemBar()) { |
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136 result = proj_in->in(TypeFunc::Memory); |
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137 } else { |
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138 assert(false, "unexpected projection"); |
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139 } |
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140 } else if (result->is_ClearArray()) { |
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141 if (!ClearArrayNode::step_through(&result, instance_id, phase)) { |
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142 // Can not bypass initialization of the instance |
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143 // we are looking for. |
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144 break; |
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145 } |
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146 // Otherwise skip it (the call updated 'result' value). |
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147 } else if (result->is_MergeMem()) { |
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148 result = step_through_mergemem(phase, result->as_MergeMem(), t_adr, NULL, tty); |
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149 } |
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150 } |
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151 return result; |
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152 } |
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153 |
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154 Node *MemNode::optimize_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase) { |
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155 const TypeOopPtr *t_oop = t_adr->isa_oopptr(); |
223 | 156 bool is_instance = (t_oop != NULL) && t_oop->is_known_instance_field(); |
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157 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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158 Node *result = mchain; |
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159 result = optimize_simple_memory_chain(result, t_adr, phase); |
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160 if (is_instance && igvn != NULL && result->is_Phi()) { |
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161 PhiNode *mphi = result->as_Phi(); |
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162 assert(mphi->bottom_type() == Type::MEMORY, "memory phi required"); |
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163 const TypePtr *t = mphi->adr_type(); |
163 | 164 if (t == TypePtr::BOTTOM || t == TypeRawPtr::BOTTOM || |
223 | 165 t->isa_oopptr() && !t->is_oopptr()->is_known_instance() && |
247 | 166 t->is_oopptr()->cast_to_exactness(true) |
167 ->is_oopptr()->cast_to_ptr_type(t_oop->ptr()) | |
168 ->is_oopptr()->cast_to_instance_id(t_oop->instance_id()) == t_oop) { | |
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169 // clone the Phi with our address type |
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170 result = mphi->split_out_instance(t_adr, igvn); |
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171 } else { |
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172 assert(phase->C->get_alias_index(t) == phase->C->get_alias_index(t_adr), "correct memory chain"); |
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173 } |
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174 } |
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175 return result; |
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176 } |
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177 |
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178 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st) { |
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179 uint alias_idx = phase->C->get_alias_index(tp); |
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180 Node *mem = mmem; |
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181 #ifdef ASSERT |
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182 { |
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183 // Check that current type is consistent with the alias index used during graph construction |
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184 assert(alias_idx >= Compile::AliasIdxRaw, "must not be a bad alias_idx"); |
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185 bool consistent = adr_check == NULL || adr_check->empty() || |
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186 phase->C->must_alias(adr_check, alias_idx ); |
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187 // Sometimes dead array references collapse to a[-1], a[-2], or a[-3] |
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188 if( !consistent && adr_check != NULL && !adr_check->empty() && |
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189 tp->isa_aryptr() && tp->offset() == Type::OffsetBot && |
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190 adr_check->isa_aryptr() && adr_check->offset() != Type::OffsetBot && |
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191 ( adr_check->offset() == arrayOopDesc::length_offset_in_bytes() || |
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192 adr_check->offset() == oopDesc::klass_offset_in_bytes() || |
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193 adr_check->offset() == oopDesc::mark_offset_in_bytes() ) ) { |
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194 // don't assert if it is dead code. |
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195 consistent = true; |
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196 } |
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197 if( !consistent ) { |
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198 st->print("alias_idx==%d, adr_check==", alias_idx); |
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199 if( adr_check == NULL ) { |
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200 st->print("NULL"); |
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201 } else { |
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202 adr_check->dump(); |
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203 } |
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204 st->cr(); |
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205 print_alias_types(); |
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206 assert(consistent, "adr_check must match alias idx"); |
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207 } |
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208 } |
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209 #endif |
1815 | 210 // TypeOopPtr::NOTNULL+any is an OOP with unknown offset - generally |
64
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211 // means an array I have not precisely typed yet. Do not do any |
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212 // alias stuff with it any time soon. |
1815 | 213 const TypeOopPtr *toop = tp->isa_oopptr(); |
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214 if( tp->base() != Type::AnyPtr && |
1815 | 215 !(toop && |
216 toop->klass() != NULL && | |
217 toop->klass()->is_java_lang_Object() && | |
218 toop->offset() == Type::OffsetBot) ) { | |
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219 // compress paths and change unreachable cycles to TOP |
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220 // If not, we can update the input infinitely along a MergeMem cycle |
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221 // Equivalent code in PhiNode::Ideal |
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222 Node* m = phase->transform(mmem); |
605 | 223 // If transformed to a MergeMem, get the desired slice |
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224 // Otherwise the returned node represents memory for every slice |
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225 mem = (m->is_MergeMem())? m->as_MergeMem()->memory_at(alias_idx) : m; |
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226 // Update input if it is progress over what we have now |
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227 } |
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228 return mem; |
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229 } |
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230 |
0 | 231 //--------------------------Ideal_common--------------------------------------- |
232 // Look for degenerate control and memory inputs. Bypass MergeMem inputs. | |
233 // Unhook non-raw memories from complete (macro-expanded) initializations. | |
234 Node *MemNode::Ideal_common(PhaseGVN *phase, bool can_reshape) { | |
235 // If our control input is a dead region, kill all below the region | |
236 Node *ctl = in(MemNode::Control); | |
237 if (ctl && remove_dead_region(phase, can_reshape)) | |
238 return this; | |
305 | 239 ctl = in(MemNode::Control); |
240 // Don't bother trying to transform a dead node | |
241 if( ctl && ctl->is_top() ) return NodeSentinel; | |
0 | 242 |
708
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243 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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244 // Wait if control on the worklist. |
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245 if (ctl && can_reshape && igvn != NULL) { |
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246 Node* bol = NULL; |
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247 Node* cmp = NULL; |
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248 if (ctl->in(0)->is_If()) { |
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249 assert(ctl->is_IfTrue() || ctl->is_IfFalse(), "sanity"); |
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250 bol = ctl->in(0)->in(1); |
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251 if (bol->is_Bool()) |
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252 cmp = ctl->in(0)->in(1)->in(1); |
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253 } |
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254 if (igvn->_worklist.member(ctl) || |
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255 (bol != NULL && igvn->_worklist.member(bol)) || |
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256 (cmp != NULL && igvn->_worklist.member(cmp)) ) { |
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257 // This control path may be dead. |
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258 // Delay this memory node transformation until the control is processed. |
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259 phase->is_IterGVN()->_worklist.push(this); |
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260 return NodeSentinel; // caller will return NULL |
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261 } |
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262 } |
0 | 263 // Ignore if memory is dead, or self-loop |
264 Node *mem = in(MemNode::Memory); | |
265 if( phase->type( mem ) == Type::TOP ) return NodeSentinel; // caller will return NULL | |
266 assert( mem != this, "dead loop in MemNode::Ideal" ); | |
267 | |
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268 if (can_reshape && igvn != NULL && igvn->_worklist.member(mem)) { |
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269 // This memory slice may be dead. |
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270 // Delay this mem node transformation until the memory is processed. |
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271 phase->is_IterGVN()->_worklist.push(this); |
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272 return NodeSentinel; // caller will return NULL |
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273 } |
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274 |
0 | 275 Node *address = in(MemNode::Address); |
276 const Type *t_adr = phase->type( address ); | |
277 if( t_adr == Type::TOP ) return NodeSentinel; // caller will return NULL | |
278 | |
708
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279 if( can_reshape && igvn != NULL && |
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280 (igvn->_worklist.member(address) || |
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281 igvn->_worklist.size() > 0 && (phase->type(address) != adr_type())) ) { |
420
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282 // The address's base and type may change when the address is processed. |
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283 // Delay this mem node transformation until the address is processed. |
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284 phase->is_IterGVN()->_worklist.push(this); |
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285 return NodeSentinel; // caller will return NULL |
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286 } |
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287 |
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288 // Do NOT remove or optimize the next lines: ensure a new alias index |
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289 // is allocated for an oop pointer type before Escape Analysis. |
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290 // Note: C++ will not remove it since the call has side effect. |
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291 if ( t_adr->isa_oopptr() ) { |
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292 int alias_idx = phase->C->get_alias_index(t_adr->is_ptr()); |
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293 } |
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294 |
708
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295 #ifdef ASSERT |
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296 Node* base = NULL; |
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297 if (address->is_AddP()) |
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298 base = address->in(AddPNode::Base); |
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299 assert(base == NULL || t_adr->isa_rawptr() || |
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300 !phase->type(base)->higher_equal(TypePtr::NULL_PTR), "NULL+offs not RAW address?"); |
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301 #endif |
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302 |
0 | 303 // Avoid independent memory operations |
304 Node* old_mem = mem; | |
305 | |
36 | 306 // The code which unhooks non-raw memories from complete (macro-expanded) |
307 // initializations was removed. After macro-expansion all stores catched | |
308 // by Initialize node became raw stores and there is no information | |
309 // which memory slices they modify. So it is unsafe to move any memory | |
310 // operation above these stores. Also in most cases hooked non-raw memories | |
311 // were already unhooked by using information from detect_ptr_independence() | |
312 // and find_previous_store(). | |
0 | 313 |
314 if (mem->is_MergeMem()) { | |
315 MergeMemNode* mmem = mem->as_MergeMem(); | |
316 const TypePtr *tp = t_adr->is_ptr(); | |
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317 |
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318 mem = step_through_mergemem(phase, mmem, tp, adr_type(), tty); |
0 | 319 } |
320 | |
321 if (mem != old_mem) { | |
322 set_req(MemNode::Memory, mem); | |
305 | 323 if (phase->type( mem ) == Type::TOP) return NodeSentinel; |
0 | 324 return this; |
325 } | |
326 | |
327 // let the subclass continue analyzing... | |
328 return NULL; | |
329 } | |
330 | |
331 // Helper function for proving some simple control dominations. | |
119
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332 // Attempt to prove that all control inputs of 'dom' dominate 'sub'. |
0 | 333 // Already assumes that 'dom' is available at 'sub', and that 'sub' |
334 // is not a constant (dominated by the method's StartNode). | |
335 // Used by MemNode::find_previous_store to prove that the | |
336 // control input of a memory operation predates (dominates) | |
337 // an allocation it wants to look past. | |
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338 bool MemNode::all_controls_dominate(Node* dom, Node* sub) { |
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339 if (dom == NULL || dom->is_top() || sub == NULL || sub->is_top()) |
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340 return false; // Conservative answer for dead code |
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341 |
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342 // Check 'dom'. Skip Proj and CatchProj nodes. |
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343 dom = dom->find_exact_control(dom); |
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344 if (dom == NULL || dom->is_top()) |
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345 return false; // Conservative answer for dead code |
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346 |
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347 if (dom == sub) { |
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348 // For the case when, for example, 'sub' is Initialize and the original |
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349 // 'dom' is Proj node of the 'sub'. |
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350 return false; |
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351 } |
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352 |
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353 if (dom->is_Con() || dom->is_Start() || dom->is_Root() || dom == sub) |
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354 return true; |
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355 |
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356 // 'dom' dominates 'sub' if its control edge and control edges |
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357 // of all its inputs dominate or equal to sub's control edge. |
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358 |
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359 // Currently 'sub' is either Allocate, Initialize or Start nodes. |
163 | 360 // Or Region for the check in LoadNode::Ideal(); |
361 // 'sub' should have sub->in(0) != NULL. | |
362 assert(sub->is_Allocate() || sub->is_Initialize() || sub->is_Start() || | |
363 sub->is_Region(), "expecting only these nodes"); | |
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364 |
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365 // Get control edge of 'sub'. |
193
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366 Node* orig_sub = sub; |
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367 sub = sub->find_exact_control(sub->in(0)); |
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368 if (sub == NULL || sub->is_top()) |
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369 return false; // Conservative answer for dead code |
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370 |
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371 assert(sub->is_CFG(), "expecting control"); |
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372 |
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373 if (sub == dom) |
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374 return true; |
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375 |
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376 if (sub->is_Start() || sub->is_Root()) |
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377 return false; |
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378 |
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379 { |
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380 // Check all control edges of 'dom'. |
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381 |
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382 ResourceMark rm; |
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383 Arena* arena = Thread::current()->resource_area(); |
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384 Node_List nlist(arena); |
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385 Unique_Node_List dom_list(arena); |
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386 |
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387 dom_list.push(dom); |
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388 bool only_dominating_controls = false; |
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389 |
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390 for (uint next = 0; next < dom_list.size(); next++) { |
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391 Node* n = dom_list.at(next); |
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392 if (n == orig_sub) |
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393 return false; // One of dom's inputs dominated by sub. |
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394 if (!n->is_CFG() && n->pinned()) { |
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395 // Check only own control edge for pinned non-control nodes. |
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396 n = n->find_exact_control(n->in(0)); |
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397 if (n == NULL || n->is_top()) |
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398 return false; // Conservative answer for dead code |
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399 assert(n->is_CFG(), "expecting control"); |
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400 dom_list.push(n); |
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401 } else if (n->is_Con() || n->is_Start() || n->is_Root()) { |
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402 only_dominating_controls = true; |
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403 } else if (n->is_CFG()) { |
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404 if (n->dominates(sub, nlist)) |
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405 only_dominating_controls = true; |
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406 else |
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407 return false; |
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408 } else { |
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409 // First, own control edge. |
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410 Node* m = n->find_exact_control(n->in(0)); |
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411 if (m != NULL) { |
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412 if (m->is_top()) |
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413 return false; // Conservative answer for dead code |
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414 dom_list.push(m); |
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415 } |
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416 // Now, the rest of edges. |
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417 uint cnt = n->req(); |
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418 for (uint i = 1; i < cnt; i++) { |
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419 m = n->find_exact_control(n->in(i)); |
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420 if (m == NULL || m->is_top()) |
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421 continue; |
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422 dom_list.push(m); |
0 | 423 } |
424 } | |
425 } | |
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426 return only_dominating_controls; |
0 | 427 } |
428 } | |
429 | |
430 //---------------------detect_ptr_independence--------------------------------- | |
431 // Used by MemNode::find_previous_store to prove that two base | |
432 // pointers are never equal. | |
433 // The pointers are accompanied by their associated allocations, | |
434 // if any, which have been previously discovered by the caller. | |
435 bool MemNode::detect_ptr_independence(Node* p1, AllocateNode* a1, | |
436 Node* p2, AllocateNode* a2, | |
437 PhaseTransform* phase) { | |
438 // Attempt to prove that these two pointers cannot be aliased. | |
439 // They may both manifestly be allocations, and they should differ. | |
440 // Or, if they are not both allocations, they can be distinct constants. | |
441 // Otherwise, one is an allocation and the other a pre-existing value. | |
442 if (a1 == NULL && a2 == NULL) { // neither an allocation | |
443 return (p1 != p2) && p1->is_Con() && p2->is_Con(); | |
444 } else if (a1 != NULL && a2 != NULL) { // both allocations | |
445 return (a1 != a2); | |
446 } else if (a1 != NULL) { // one allocation a1 | |
447 // (Note: p2->is_Con implies p2->in(0)->is_Root, which dominates.) | |
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448 return all_controls_dominate(p2, a1); |
0 | 449 } else { //(a2 != NULL) // one allocation a2 |
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450 return all_controls_dominate(p1, a2); |
0 | 451 } |
452 return false; | |
453 } | |
454 | |
455 | |
456 // The logic for reordering loads and stores uses four steps: | |
457 // (a) Walk carefully past stores and initializations which we | |
458 // can prove are independent of this load. | |
459 // (b) Observe that the next memory state makes an exact match | |
460 // with self (load or store), and locate the relevant store. | |
461 // (c) Ensure that, if we were to wire self directly to the store, | |
462 // the optimizer would fold it up somehow. | |
463 // (d) Do the rewiring, and return, depending on some other part of | |
464 // the optimizer to fold up the load. | |
465 // This routine handles steps (a) and (b). Steps (c) and (d) are | |
466 // specific to loads and stores, so they are handled by the callers. | |
467 // (Currently, only LoadNode::Ideal has steps (c), (d). More later.) | |
468 // | |
469 Node* MemNode::find_previous_store(PhaseTransform* phase) { | |
470 Node* ctrl = in(MemNode::Control); | |
471 Node* adr = in(MemNode::Address); | |
472 intptr_t offset = 0; | |
473 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
474 AllocateNode* alloc = AllocateNode::Ideal_allocation(base, phase); | |
475 | |
476 if (offset == Type::OffsetBot) | |
477 return NULL; // cannot unalias unless there are precise offsets | |
478 | |
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479 const TypeOopPtr *addr_t = adr->bottom_type()->isa_oopptr(); |
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480 |
0 | 481 intptr_t size_in_bytes = memory_size(); |
482 | |
483 Node* mem = in(MemNode::Memory); // start searching here... | |
484 | |
485 int cnt = 50; // Cycle limiter | |
486 for (;;) { // While we can dance past unrelated stores... | |
487 if (--cnt < 0) break; // Caught in cycle or a complicated dance? | |
488 | |
489 if (mem->is_Store()) { | |
490 Node* st_adr = mem->in(MemNode::Address); | |
491 intptr_t st_offset = 0; | |
492 Node* st_base = AddPNode::Ideal_base_and_offset(st_adr, phase, st_offset); | |
493 if (st_base == NULL) | |
494 break; // inscrutable pointer | |
495 if (st_offset != offset && st_offset != Type::OffsetBot) { | |
496 const int MAX_STORE = BytesPerLong; | |
497 if (st_offset >= offset + size_in_bytes || | |
498 st_offset <= offset - MAX_STORE || | |
499 st_offset <= offset - mem->as_Store()->memory_size()) { | |
500 // Success: The offsets are provably independent. | |
501 // (You may ask, why not just test st_offset != offset and be done? | |
502 // The answer is that stores of different sizes can co-exist | |
503 // in the same sequence of RawMem effects. We sometimes initialize | |
504 // a whole 'tile' of array elements with a single jint or jlong.) | |
505 mem = mem->in(MemNode::Memory); | |
506 continue; // (a) advance through independent store memory | |
507 } | |
508 } | |
509 if (st_base != base && | |
510 detect_ptr_independence(base, alloc, | |
511 st_base, | |
512 AllocateNode::Ideal_allocation(st_base, phase), | |
513 phase)) { | |
514 // Success: The bases are provably independent. | |
515 mem = mem->in(MemNode::Memory); | |
516 continue; // (a) advance through independent store memory | |
517 } | |
518 | |
519 // (b) At this point, if the bases or offsets do not agree, we lose, | |
520 // since we have not managed to prove 'this' and 'mem' independent. | |
521 if (st_base == base && st_offset == offset) { | |
522 return mem; // let caller handle steps (c), (d) | |
523 } | |
524 | |
525 } else if (mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
526 InitializeNode* st_init = mem->in(0)->as_Initialize(); | |
527 AllocateNode* st_alloc = st_init->allocation(); | |
528 if (st_alloc == NULL) | |
529 break; // something degenerated | |
530 bool known_identical = false; | |
531 bool known_independent = false; | |
532 if (alloc == st_alloc) | |
533 known_identical = true; | |
534 else if (alloc != NULL) | |
535 known_independent = true; | |
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536 else if (all_controls_dominate(this, st_alloc)) |
0 | 537 known_independent = true; |
538 | |
539 if (known_independent) { | |
540 // The bases are provably independent: Either they are | |
541 // manifestly distinct allocations, or else the control | |
542 // of this load dominates the store's allocation. | |
543 int alias_idx = phase->C->get_alias_index(adr_type()); | |
544 if (alias_idx == Compile::AliasIdxRaw) { | |
545 mem = st_alloc->in(TypeFunc::Memory); | |
546 } else { | |
547 mem = st_init->memory(alias_idx); | |
548 } | |
549 continue; // (a) advance through independent store memory | |
550 } | |
551 | |
552 // (b) at this point, if we are not looking at a store initializing | |
553 // the same allocation we are loading from, we lose. | |
554 if (known_identical) { | |
555 // From caller, can_see_stored_value will consult find_captured_store. | |
556 return mem; // let caller handle steps (c), (d) | |
557 } | |
558 | |
223 | 559 } else if (addr_t != NULL && addr_t->is_known_instance_field()) { |
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560 // Can't use optimize_simple_memory_chain() since it needs PhaseGVN. |
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561 if (mem->is_Proj() && mem->in(0)->is_Call()) { |
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562 CallNode *call = mem->in(0)->as_Call(); |
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563 if (!call->may_modify(addr_t, phase)) { |
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564 mem = call->in(TypeFunc::Memory); |
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565 continue; // (a) advance through independent call memory |
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566 } |
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567 } else if (mem->is_Proj() && mem->in(0)->is_MemBar()) { |
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568 mem = mem->in(0)->in(TypeFunc::Memory); |
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569 continue; // (a) advance through independent MemBar memory |
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570 } else if (mem->is_ClearArray()) { |
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571 if (ClearArrayNode::step_through(&mem, (uint)addr_t->instance_id(), phase)) { |
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572 // (the call updated 'mem' value) |
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573 continue; // (a) advance through independent allocation memory |
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574 } else { |
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575 // Can not bypass initialization of the instance |
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576 // we are looking for. |
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577 return mem; |
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578 } |
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579 } else if (mem->is_MergeMem()) { |
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580 int alias_idx = phase->C->get_alias_index(adr_type()); |
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581 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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582 continue; // (a) advance through independent MergeMem memory |
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583 } |
0 | 584 } |
585 | |
586 // Unless there is an explicit 'continue', we must bail out here, | |
587 // because 'mem' is an inscrutable memory state (e.g., a call). | |
588 break; | |
589 } | |
590 | |
591 return NULL; // bail out | |
592 } | |
593 | |
594 //----------------------calculate_adr_type------------------------------------- | |
595 // Helper function. Notices when the given type of address hits top or bottom. | |
596 // Also, asserts a cross-check of the type against the expected address type. | |
597 const TypePtr* MemNode::calculate_adr_type(const Type* t, const TypePtr* cross_check) { | |
598 if (t == Type::TOP) return NULL; // does not touch memory any more? | |
599 #ifdef PRODUCT | |
600 cross_check = NULL; | |
601 #else | |
602 if (!VerifyAliases || is_error_reported() || Node::in_dump()) cross_check = NULL; | |
603 #endif | |
604 const TypePtr* tp = t->isa_ptr(); | |
605 if (tp == NULL) { | |
606 assert(cross_check == NULL || cross_check == TypePtr::BOTTOM, "expected memory type must be wide"); | |
607 return TypePtr::BOTTOM; // touches lots of memory | |
608 } else { | |
609 #ifdef ASSERT | |
610 // %%%% [phh] We don't check the alias index if cross_check is | |
611 // TypeRawPtr::BOTTOM. Needs to be investigated. | |
612 if (cross_check != NULL && | |
613 cross_check != TypePtr::BOTTOM && | |
614 cross_check != TypeRawPtr::BOTTOM) { | |
615 // Recheck the alias index, to see if it has changed (due to a bug). | |
616 Compile* C = Compile::current(); | |
617 assert(C->get_alias_index(cross_check) == C->get_alias_index(tp), | |
618 "must stay in the original alias category"); | |
619 // The type of the address must be contained in the adr_type, | |
620 // disregarding "null"-ness. | |
621 // (We make an exception for TypeRawPtr::BOTTOM, which is a bit bucket.) | |
622 const TypePtr* tp_notnull = tp->join(TypePtr::NOTNULL)->is_ptr(); | |
623 assert(cross_check->meet(tp_notnull) == cross_check, | |
624 "real address must not escape from expected memory type"); | |
625 } | |
626 #endif | |
627 return tp; | |
628 } | |
629 } | |
630 | |
631 //------------------------adr_phi_is_loop_invariant---------------------------- | |
632 // A helper function for Ideal_DU_postCCP to check if a Phi in a counted | |
633 // loop is loop invariant. Make a quick traversal of Phi and associated | |
634 // CastPP nodes, looking to see if they are a closed group within the loop. | |
635 bool MemNode::adr_phi_is_loop_invariant(Node* adr_phi, Node* cast) { | |
636 // The idea is that the phi-nest must boil down to only CastPP nodes | |
637 // with the same data. This implies that any path into the loop already | |
638 // includes such a CastPP, and so the original cast, whatever its input, | |
639 // must be covered by an equivalent cast, with an earlier control input. | |
640 ResourceMark rm; | |
641 | |
642 // The loop entry input of the phi should be the unique dominating | |
643 // node for every Phi/CastPP in the loop. | |
644 Unique_Node_List closure; | |
645 closure.push(adr_phi->in(LoopNode::EntryControl)); | |
646 | |
647 // Add the phi node and the cast to the worklist. | |
648 Unique_Node_List worklist; | |
649 worklist.push(adr_phi); | |
650 if( cast != NULL ){ | |
651 if( !cast->is_ConstraintCast() ) return false; | |
652 worklist.push(cast); | |
653 } | |
654 | |
655 // Begin recursive walk of phi nodes. | |
656 while( worklist.size() ){ | |
657 // Take a node off the worklist | |
658 Node *n = worklist.pop(); | |
659 if( !closure.member(n) ){ | |
660 // Add it to the closure. | |
661 closure.push(n); | |
662 // Make a sanity check to ensure we don't waste too much time here. | |
663 if( closure.size() > 20) return false; | |
664 // This node is OK if: | |
665 // - it is a cast of an identical value | |
666 // - or it is a phi node (then we add its inputs to the worklist) | |
667 // Otherwise, the node is not OK, and we presume the cast is not invariant | |
668 if( n->is_ConstraintCast() ){ | |
669 worklist.push(n->in(1)); | |
670 } else if( n->is_Phi() ) { | |
671 for( uint i = 1; i < n->req(); i++ ) { | |
672 worklist.push(n->in(i)); | |
673 } | |
674 } else { | |
675 return false; | |
676 } | |
677 } | |
678 } | |
679 | |
680 // Quit when the worklist is empty, and we've found no offending nodes. | |
681 return true; | |
682 } | |
683 | |
684 //------------------------------Ideal_DU_postCCP------------------------------- | |
685 // Find any cast-away of null-ness and keep its control. Null cast-aways are | |
686 // going away in this pass and we need to make this memory op depend on the | |
687 // gating null check. | |
163 | 688 Node *MemNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
689 return Ideal_common_DU_postCCP(ccp, this, in(MemNode::Address)); | |
690 } | |
0 | 691 |
692 // I tried to leave the CastPP's in. This makes the graph more accurate in | |
693 // some sense; we get to keep around the knowledge that an oop is not-null | |
694 // after some test. Alas, the CastPP's interfere with GVN (some values are | |
695 // the regular oop, some are the CastPP of the oop, all merge at Phi's which | |
696 // cannot collapse, etc). This cost us 10% on SpecJVM, even when I removed | |
697 // some of the more trivial cases in the optimizer. Removing more useless | |
698 // Phi's started allowing Loads to illegally float above null checks. I gave | |
699 // up on this approach. CNC 10/20/2000 | |
163 | 700 // This static method may be called not from MemNode (EncodePNode calls it). |
701 // Only the control edge of the node 'n' might be updated. | |
702 Node *MemNode::Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr ) { | |
0 | 703 Node *skipped_cast = NULL; |
704 // Need a null check? Regular static accesses do not because they are | |
705 // from constant addresses. Array ops are gated by the range check (which | |
706 // always includes a NULL check). Just check field ops. | |
163 | 707 if( n->in(MemNode::Control) == NULL ) { |
0 | 708 // Scan upwards for the highest location we can place this memory op. |
709 while( true ) { | |
710 switch( adr->Opcode() ) { | |
711 | |
712 case Op_AddP: // No change to NULL-ness, so peek thru AddP's | |
713 adr = adr->in(AddPNode::Base); | |
714 continue; | |
715 | |
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716 case Op_DecodeN: // No change to NULL-ness, so peek thru |
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717 adr = adr->in(1); |
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718 continue; |
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719 |
0 | 720 case Op_CastPP: |
721 // If the CastPP is useless, just peek on through it. | |
722 if( ccp->type(adr) == ccp->type(adr->in(1)) ) { | |
723 // Remember the cast that we've peeked though. If we peek | |
724 // through more than one, then we end up remembering the highest | |
725 // one, that is, if in a loop, the one closest to the top. | |
726 skipped_cast = adr; | |
727 adr = adr->in(1); | |
728 continue; | |
729 } | |
730 // CastPP is going away in this pass! We need this memory op to be | |
731 // control-dependent on the test that is guarding the CastPP. | |
163 | 732 ccp->hash_delete(n); |
733 n->set_req(MemNode::Control, adr->in(0)); | |
734 ccp->hash_insert(n); | |
735 return n; | |
0 | 736 |
737 case Op_Phi: | |
738 // Attempt to float above a Phi to some dominating point. | |
739 if (adr->in(0) != NULL && adr->in(0)->is_CountedLoop()) { | |
740 // If we've already peeked through a Cast (which could have set the | |
741 // control), we can't float above a Phi, because the skipped Cast | |
742 // may not be loop invariant. | |
743 if (adr_phi_is_loop_invariant(adr, skipped_cast)) { | |
744 adr = adr->in(1); | |
745 continue; | |
746 } | |
747 } | |
748 | |
749 // Intentional fallthrough! | |
750 | |
751 // No obvious dominating point. The mem op is pinned below the Phi | |
752 // by the Phi itself. If the Phi goes away (no true value is merged) | |
753 // then the mem op can float, but not indefinitely. It must be pinned | |
754 // behind the controls leading to the Phi. | |
755 case Op_CheckCastPP: | |
756 // These usually stick around to change address type, however a | |
757 // useless one can be elided and we still need to pick up a control edge | |
758 if (adr->in(0) == NULL) { | |
759 // This CheckCastPP node has NO control and is likely useless. But we | |
760 // need check further up the ancestor chain for a control input to keep | |
761 // the node in place. 4959717. | |
762 skipped_cast = adr; | |
763 adr = adr->in(1); | |
764 continue; | |
765 } | |
163 | 766 ccp->hash_delete(n); |
767 n->set_req(MemNode::Control, adr->in(0)); | |
768 ccp->hash_insert(n); | |
769 return n; | |
0 | 770 |
771 // List of "safe" opcodes; those that implicitly block the memory | |
772 // op below any null check. | |
773 case Op_CastX2P: // no null checks on native pointers | |
774 case Op_Parm: // 'this' pointer is not null | |
775 case Op_LoadP: // Loading from within a klass | |
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776 case Op_LoadN: // Loading from within a klass |
0 | 777 case Op_LoadKlass: // Loading from within a klass |
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778 case Op_LoadNKlass: // Loading from within a klass |
0 | 779 case Op_ConP: // Loading from a klass |
163 | 780 case Op_ConN: // Loading from a klass |
0 | 781 case Op_CreateEx: // Sucking up the guts of an exception oop |
782 case Op_Con: // Reading from TLS | |
783 case Op_CMoveP: // CMoveP is pinned | |
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784 case Op_CMoveN: // CMoveN is pinned |
0 | 785 break; // No progress |
786 | |
787 case Op_Proj: // Direct call to an allocation routine | |
788 case Op_SCMemProj: // Memory state from store conditional ops | |
789 #ifdef ASSERT | |
790 { | |
791 assert(adr->as_Proj()->_con == TypeFunc::Parms, "must be return value"); | |
792 const Node* call = adr->in(0); | |
163 | 793 if (call->is_CallJava()) { |
794 const CallJavaNode* call_java = call->as_CallJava(); | |
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795 const TypeTuple *r = call_java->tf()->range(); |
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796 assert(r->cnt() > TypeFunc::Parms, "must return value"); |
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797 const Type* ret_type = r->field_at(TypeFunc::Parms); |
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798 assert(ret_type && ret_type->isa_ptr(), "must return pointer"); |
0 | 799 // We further presume that this is one of |
800 // new_instance_Java, new_array_Java, or | |
801 // the like, but do not assert for this. | |
802 } else if (call->is_Allocate()) { | |
803 // similar case to new_instance_Java, etc. | |
804 } else if (!call->is_CallLeaf()) { | |
805 // Projections from fetch_oop (OSR) are allowed as well. | |
806 ShouldNotReachHere(); | |
807 } | |
808 } | |
809 #endif | |
810 break; | |
811 default: | |
812 ShouldNotReachHere(); | |
813 } | |
814 break; | |
815 } | |
816 } | |
817 | |
818 return NULL; // No progress | |
819 } | |
820 | |
821 | |
822 //============================================================================= | |
823 uint LoadNode::size_of() const { return sizeof(*this); } | |
824 uint LoadNode::cmp( const Node &n ) const | |
825 { return !Type::cmp( _type, ((LoadNode&)n)._type ); } | |
826 const Type *LoadNode::bottom_type() const { return _type; } | |
827 uint LoadNode::ideal_reg() const { | |
828 return Matcher::base2reg[_type->base()]; | |
829 } | |
830 | |
831 #ifndef PRODUCT | |
832 void LoadNode::dump_spec(outputStream *st) const { | |
833 MemNode::dump_spec(st); | |
834 if( !Verbose && !WizardMode ) { | |
835 // standard dump does this in Verbose and WizardMode | |
836 st->print(" #"); _type->dump_on(st); | |
837 } | |
838 } | |
839 #endif | |
840 | |
1609 | 841 #ifdef ASSERT |
842 //----------------------------is_immutable_value------------------------------- | |
843 // Helper function to allow a raw load without control edge for some cases | |
844 bool LoadNode::is_immutable_value(Node* adr) { | |
845 return (adr->is_AddP() && adr->in(AddPNode::Base)->is_top() && | |
846 adr->in(AddPNode::Address)->Opcode() == Op_ThreadLocal && | |
847 (adr->in(AddPNode::Offset)->find_intptr_t_con(-1) == | |
848 in_bytes(JavaThread::osthread_offset()))); | |
849 } | |
850 #endif | |
0 | 851 |
852 //----------------------------LoadNode::make----------------------------------- | |
853 // Polymorphic factory method: | |
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854 Node *LoadNode::make( PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const TypePtr* adr_type, const Type *rt, BasicType bt ) { |
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855 Compile* C = gvn.C; |
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856 |
0 | 857 // sanity check the alias category against the created node type |
858 assert(!(adr_type->isa_oopptr() && | |
859 adr_type->offset() == oopDesc::klass_offset_in_bytes()), | |
860 "use LoadKlassNode instead"); | |
861 assert(!(adr_type->isa_aryptr() && | |
862 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()), | |
863 "use LoadRangeNode instead"); | |
1609 | 864 // Check control edge of raw loads |
865 assert( ctl != NULL || C->get_alias_index(adr_type) != Compile::AliasIdxRaw || | |
866 // oop will be recorded in oop map if load crosses safepoint | |
867 rt->isa_oopptr() || is_immutable_value(adr), | |
868 "raw memory operations should have control edge"); | |
0 | 869 switch (bt) { |
624 | 870 case T_BOOLEAN: return new (C, 3) LoadUBNode(ctl, mem, adr, adr_type, rt->is_int() ); |
558
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871 case T_BYTE: return new (C, 3) LoadBNode (ctl, mem, adr, adr_type, rt->is_int() ); |
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872 case T_INT: return new (C, 3) LoadINode (ctl, mem, adr, adr_type, rt->is_int() ); |
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873 case T_CHAR: return new (C, 3) LoadUSNode(ctl, mem, adr, adr_type, rt->is_int() ); |
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874 case T_SHORT: return new (C, 3) LoadSNode (ctl, mem, adr, adr_type, rt->is_int() ); |
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875 case T_LONG: return new (C, 3) LoadLNode (ctl, mem, adr, adr_type, rt->is_long() ); |
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876 case T_FLOAT: return new (C, 3) LoadFNode (ctl, mem, adr, adr_type, rt ); |
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877 case T_DOUBLE: return new (C, 3) LoadDNode (ctl, mem, adr, adr_type, rt ); |
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878 case T_ADDRESS: return new (C, 3) LoadPNode (ctl, mem, adr, adr_type, rt->is_ptr() ); |
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879 case T_OBJECT: |
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880 #ifdef _LP64 |
163 | 881 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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882 Node* load = gvn.transform(new (C, 3) LoadNNode(ctl, mem, adr, adr_type, rt->make_narrowoop())); |
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883 return new (C, 2) DecodeNNode(load, load->bottom_type()->make_ptr()); |
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884 } else |
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885 #endif |
163 | 886 { |
887 assert(!adr->bottom_type()->is_ptr_to_narrowoop(), "should have got back a narrow oop"); | |
888 return new (C, 3) LoadPNode(ctl, mem, adr, adr_type, rt->is_oopptr()); | |
889 } | |
0 | 890 } |
891 ShouldNotReachHere(); | |
892 return (LoadNode*)NULL; | |
893 } | |
894 | |
895 LoadLNode* LoadLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt) { | |
896 bool require_atomic = true; | |
897 return new (C, 3) LoadLNode(ctl, mem, adr, adr_type, rt->is_long(), require_atomic); | |
898 } | |
899 | |
900 | |
901 | |
902 | |
903 //------------------------------hash------------------------------------------- | |
904 uint LoadNode::hash() const { | |
905 // unroll addition of interesting fields | |
906 return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address); | |
907 } | |
908 | |
909 //---------------------------can_see_stored_value------------------------------ | |
910 // This routine exists to make sure this set of tests is done the same | |
911 // everywhere. We need to make a coordinated change: first LoadNode::Ideal | |
912 // will change the graph shape in a way which makes memory alive twice at the | |
913 // same time (uses the Oracle model of aliasing), then some | |
914 // LoadXNode::Identity will fold things back to the equivalence-class model | |
915 // of aliasing. | |
916 Node* MemNode::can_see_stored_value(Node* st, PhaseTransform* phase) const { | |
917 Node* ld_adr = in(MemNode::Address); | |
918 | |
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919 const TypeInstPtr* tp = phase->type(ld_adr)->isa_instptr(); |
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920 Compile::AliasType* atp = tp != NULL ? phase->C->alias_type(tp) : NULL; |
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921 if (EliminateAutoBox && atp != NULL && atp->index() >= Compile::AliasIdxRaw && |
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922 atp->field() != NULL && !atp->field()->is_volatile()) { |
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923 uint alias_idx = atp->index(); |
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924 bool final = atp->field()->is_final(); |
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925 Node* result = NULL; |
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926 Node* current = st; |
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927 // Skip through chains of MemBarNodes checking the MergeMems for |
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928 // new states for the slice of this load. Stop once any other |
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929 // kind of node is encountered. Loads from final memory can skip |
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930 // through any kind of MemBar but normal loads shouldn't skip |
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931 // through MemBarAcquire since the could allow them to move out of |
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932 // a synchronized region. |
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933 while (current->is_Proj()) { |
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934 int opc = current->in(0)->Opcode(); |
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935 if ((final && (opc == Op_MemBarAcquire || opc == Op_MemBarAcquireLock)) || |
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936 opc == Op_MemBarRelease || opc == Op_MemBarCPUOrder || |
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937 opc == Op_MemBarReleaseLock) { |
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938 Node* mem = current->in(0)->in(TypeFunc::Memory); |
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939 if (mem->is_MergeMem()) { |
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940 MergeMemNode* merge = mem->as_MergeMem(); |
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941 Node* new_st = merge->memory_at(alias_idx); |
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942 if (new_st == merge->base_memory()) { |
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943 // Keep searching |
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944 current = merge->base_memory(); |
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945 continue; |
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946 } |
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947 // Save the new memory state for the slice and fall through |
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948 // to exit. |
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949 result = new_st; |
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950 } |
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951 } |
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952 break; |
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953 } |
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954 if (result != NULL) { |
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955 st = result; |
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956 } |
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957 } |
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958 |
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959 |
0 | 960 // Loop around twice in the case Load -> Initialize -> Store. |
961 // (See PhaseIterGVN::add_users_to_worklist, which knows about this case.) | |
962 for (int trip = 0; trip <= 1; trip++) { | |
963 | |
964 if (st->is_Store()) { | |
965 Node* st_adr = st->in(MemNode::Address); | |
966 if (!phase->eqv(st_adr, ld_adr)) { | |
967 // Try harder before giving up... Match raw and non-raw pointers. | |
968 intptr_t st_off = 0; | |
969 AllocateNode* alloc = AllocateNode::Ideal_allocation(st_adr, phase, st_off); | |
970 if (alloc == NULL) return NULL; | |
971 intptr_t ld_off = 0; | |
972 AllocateNode* allo2 = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off); | |
973 if (alloc != allo2) return NULL; | |
974 if (ld_off != st_off) return NULL; | |
975 // At this point we have proven something like this setup: | |
976 // A = Allocate(...) | |
977 // L = LoadQ(, AddP(CastPP(, A.Parm),, #Off)) | |
978 // S = StoreQ(, AddP(, A.Parm , #Off), V) | |
979 // (Actually, we haven't yet proven the Q's are the same.) | |
980 // In other words, we are loading from a casted version of | |
981 // the same pointer-and-offset that we stored to. | |
982 // Thus, we are able to replace L by V. | |
983 } | |
984 // Now prove that we have a LoadQ matched to a StoreQ, for some Q. | |
985 if (store_Opcode() != st->Opcode()) | |
986 return NULL; | |
987 return st->in(MemNode::ValueIn); | |
988 } | |
989 | |
990 intptr_t offset = 0; // scratch | |
991 | |
992 // A load from a freshly-created object always returns zero. | |
993 // (This can happen after LoadNode::Ideal resets the load's memory input | |
994 // to find_captured_store, which returned InitializeNode::zero_memory.) | |
995 if (st->is_Proj() && st->in(0)->is_Allocate() && | |
996 st->in(0) == AllocateNode::Ideal_allocation(ld_adr, phase, offset) && | |
997 offset >= st->in(0)->as_Allocate()->minimum_header_size()) { | |
998 // return a zero value for the load's basic type | |
999 // (This is one of the few places where a generic PhaseTransform | |
1000 // can create new nodes. Think of it as lazily manifesting | |
1001 // virtually pre-existing constants.) | |
1002 return phase->zerocon(memory_type()); | |
1003 } | |
1004 | |
1005 // A load from an initialization barrier can match a captured store. | |
1006 if (st->is_Proj() && st->in(0)->is_Initialize()) { | |
1007 InitializeNode* init = st->in(0)->as_Initialize(); | |
1008 AllocateNode* alloc = init->allocation(); | |
1009 if (alloc != NULL && | |
1010 alloc == AllocateNode::Ideal_allocation(ld_adr, phase, offset)) { | |
1011 // examine a captured store value | |
1012 st = init->find_captured_store(offset, memory_size(), phase); | |
1013 if (st != NULL) | |
1014 continue; // take one more trip around | |
1015 } | |
1016 } | |
1017 | |
1018 break; | |
1019 } | |
1020 | |
1021 return NULL; | |
1022 } | |
1023 | |
64
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1024 //----------------------is_instance_field_load_with_local_phi------------------ |
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1025 bool LoadNode::is_instance_field_load_with_local_phi(Node* ctrl) { |
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1026 if( in(MemNode::Memory)->is_Phi() && in(MemNode::Memory)->in(0) == ctrl && |
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1027 in(MemNode::Address)->is_AddP() ) { |
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1028 const TypeOopPtr* t_oop = in(MemNode::Address)->bottom_type()->isa_oopptr(); |
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1029 // Only instances. |
223 | 1030 if( t_oop != NULL && t_oop->is_known_instance_field() && |
64
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1031 t_oop->offset() != Type::OffsetBot && |
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1032 t_oop->offset() != Type::OffsetTop) { |
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1033 return true; |
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1034 } |
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1035 } |
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1036 return false; |
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1037 } |
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1038 |
0 | 1039 //------------------------------Identity--------------------------------------- |
1040 // Loads are identity if previous store is to same address | |
1041 Node *LoadNode::Identity( PhaseTransform *phase ) { | |
1042 // If the previous store-maker is the right kind of Store, and the store is | |
1043 // to the same address, then we are equal to the value stored. | |
1044 Node* mem = in(MemNode::Memory); | |
1045 Node* value = can_see_stored_value(mem, phase); | |
1046 if( value ) { | |
1047 // byte, short & char stores truncate naturally. | |
1048 // A load has to load the truncated value which requires | |
1049 // some sort of masking operation and that requires an | |
1050 // Ideal call instead of an Identity call. | |
1051 if (memory_size() < BytesPerInt) { | |
1052 // If the input to the store does not fit with the load's result type, | |
1053 // it must be truncated via an Ideal call. | |
1054 if (!phase->type(value)->higher_equal(phase->type(this))) | |
1055 return this; | |
1056 } | |
1057 // (This works even when value is a Con, but LoadNode::Value | |
1058 // usually runs first, producing the singleton type of the Con.) | |
1059 return value; | |
1060 } | |
64
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1061 |
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1062 // Search for an existing data phi which was generated before for the same |
605 | 1063 // instance's field to avoid infinite generation of phis in a loop. |
64
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1064 Node *region = mem->in(0); |
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1065 if (is_instance_field_load_with_local_phi(region)) { |
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1066 const TypePtr *addr_t = in(MemNode::Address)->bottom_type()->isa_ptr(); |
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1067 int this_index = phase->C->get_alias_index(addr_t); |
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1068 int this_offset = addr_t->offset(); |
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1069 int this_id = addr_t->is_oopptr()->instance_id(); |
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1070 const Type* this_type = bottom_type(); |
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1071 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
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1072 Node* phi = region->fast_out(i); |
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1073 if (phi->is_Phi() && phi != mem && |
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1074 phi->as_Phi()->is_same_inst_field(this_type, this_id, this_index, this_offset)) { |
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1075 return phi; |
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1076 } |
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1077 } |
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1078 } |
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|
1079 |
0 | 1080 return this; |
1081 } | |
1082 | |
17
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1083 |
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1084 // Returns true if the AliasType refers to the field that holds the |
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1085 // cached box array. Currently only handles the IntegerCache case. |
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1086 static bool is_autobox_cache(Compile::AliasType* atp) { |
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1087 if (atp != NULL && atp->field() != NULL) { |
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1088 ciField* field = atp->field(); |
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1089 ciSymbol* klass = field->holder()->name(); |
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1090 if (field->name() == ciSymbol::cache_field_name() && |
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1091 field->holder()->uses_default_loader() && |
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1092 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
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1093 return true; |
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1094 } |
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1095 } |
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1096 return false; |
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1097 } |
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1098 |
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1099 // Fetch the base value in the autobox array |
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1100 static bool fetch_autobox_base(Compile::AliasType* atp, int& cache_offset) { |
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1101 if (atp != NULL && atp->field() != NULL) { |
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1102 ciField* field = atp->field(); |
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1103 ciSymbol* klass = field->holder()->name(); |
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1104 if (field->name() == ciSymbol::cache_field_name() && |
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1105 field->holder()->uses_default_loader() && |
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1106 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
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1107 assert(field->is_constant(), "what?"); |
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1108 ciObjArray* array = field->constant_value().as_object()->as_obj_array(); |
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1109 // Fetch the box object at the base of the array and get its value |
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1110 ciInstance* box = array->obj_at(0)->as_instance(); |
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1111 ciInstanceKlass* ik = box->klass()->as_instance_klass(); |
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1112 if (ik->nof_nonstatic_fields() == 1) { |
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1113 // This should be true nonstatic_field_at requires calling |
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1114 // nof_nonstatic_fields so check it anyway |
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1115 ciConstant c = box->field_value(ik->nonstatic_field_at(0)); |
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1116 cache_offset = c.as_int(); |
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1117 } |
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1118 return true; |
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1119 } |
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1120 } |
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1121 return false; |
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1122 } |
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1123 |
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1124 // Returns true if the AliasType refers to the value field of an |
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1125 // autobox object. Currently only handles Integer. |
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1126 static bool is_autobox_object(Compile::AliasType* atp) { |
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1127 if (atp != NULL && atp->field() != NULL) { |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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|
1128 ciField* field = atp->field(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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|
1129 ciSymbol* klass = field->holder()->name(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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|
1130 if (field->name() == ciSymbol::value_name() && |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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|
1131 field->holder()->uses_default_loader() && |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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|
1132 klass == ciSymbol::java_lang_Integer()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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diff
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|
1133 return true; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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diff
changeset
|
1134 } |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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diff
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|
1135 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1136 return false; |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
changeset
|
1137 } |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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|
1138 |
ff5961f4c095
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diff
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|
1139 |
ff5961f4c095
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|
1140 // We're loading from an object which has autobox behaviour. |
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1141 // If this object is result of a valueOf call we'll have a phi |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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|
1142 // merging a newly allocated object and a load from the cache. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1143 // We want to replace this load with the original incoming |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
changeset
|
1144 // argument to the valueOf call. |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1145 Node* LoadNode::eliminate_autobox(PhaseGVN* phase) { |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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1146 Node* base = in(Address)->in(AddPNode::Base); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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1147 if (base->is_Phi() && base->req() == 3) { |
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parents:
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|
1148 AllocateNode* allocation = NULL; |
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1149 int allocation_index = -1; |
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1150 int load_index = -1; |
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1151 for (uint i = 1; i < base->req(); i++) { |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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|
1152 allocation = AllocateNode::Ideal_allocation(base->in(i), phase); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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1153 if (allocation != NULL) { |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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1154 allocation_index = i; |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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|
1155 load_index = 3 - allocation_index; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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|
1156 break; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1157 } |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1158 } |
583
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
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diff
changeset
|
1159 bool has_load = ( allocation != NULL && |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
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parents:
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diff
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|
1160 (base->in(load_index)->is_Load() || |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
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parents:
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diff
changeset
|
1161 base->in(load_index)->is_DecodeN() && |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
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parents:
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diff
changeset
|
1162 base->in(load_index)->in(1)->is_Load()) ); |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
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parents:
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diff
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|
1163 if (has_load && in(Memory)->is_Phi() && in(Memory)->in(0) == base->in(0)) { |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
changeset
|
1164 // Push the loads from the phi that comes from valueOf up |
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diff
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|
1165 // through it to allow elimination of the loads and the recovery |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1166 // of the original value. |
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diff
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|
1167 Node* mem_phi = in(Memory); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
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|
1168 Node* offset = in(Address)->in(AddPNode::Offset); |
553 | 1169 Node* region = base->in(0); |
17
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
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|
1170 |
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parents:
0
diff
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|
1171 Node* in1 = clone(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1172 Node* in1_addr = in1->in(Address)->clone(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1173 in1_addr->set_req(AddPNode::Base, base->in(allocation_index)); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
changeset
|
1174 in1_addr->set_req(AddPNode::Address, base->in(allocation_index)); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
changeset
|
1175 in1_addr->set_req(AddPNode::Offset, offset); |
553 | 1176 in1->set_req(0, region->in(allocation_index)); |
17
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parents:
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diff
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|
1177 in1->set_req(Address, in1_addr); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
changeset
|
1178 in1->set_req(Memory, mem_phi->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1179 |
ff5961f4c095
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parents:
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diff
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|
1180 Node* in2 = clone(); |
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parents:
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diff
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1181 Node* in2_addr = in2->in(Address)->clone(); |
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diff
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|
1182 in2_addr->set_req(AddPNode::Base, base->in(load_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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diff
changeset
|
1183 in2_addr->set_req(AddPNode::Address, base->in(load_index)); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1184 in2_addr->set_req(AddPNode::Offset, offset); |
553 | 1185 in2->set_req(0, region->in(load_index)); |
17
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parents:
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diff
changeset
|
1186 in2->set_req(Address, in2_addr); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1187 in2->set_req(Memory, mem_phi->in(load_index)); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
changeset
|
1188 |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1189 in1_addr = phase->transform(in1_addr); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1190 in1 = phase->transform(in1); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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|
1191 in2_addr = phase->transform(in2_addr); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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|
1192 in2 = phase->transform(in2); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1193 |
553 | 1194 PhiNode* result = PhiNode::make_blank(region, this); |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1195 result->set_req(allocation_index, in1); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1196 result->set_req(load_index, in2); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1197 return result; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
changeset
|
1198 } |
583
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1199 } else if (base->is_Load() || |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
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diff
changeset
|
1200 base->is_DecodeN() && base->in(1)->is_Load()) { |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1201 if (base->is_DecodeN()) { |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1202 // Get LoadN node which loads cached Integer object |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1203 base = base->in(1); |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1204 } |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1205 // Eliminate the load of Integer.value for integers from the cache |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1206 // array by deriving the value from the index into the array. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1207 // Capture the offset of the load and then reverse the computation. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1208 Node* load_base = base->in(Address)->in(AddPNode::Base); |
583
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1209 if (load_base->is_DecodeN()) { |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1210 // Get LoadN node which loads IntegerCache.cache field |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1211 load_base = load_base->in(1); |
5d75ab5f6698
6807084: AutoBox elimination is broken with compressed oops
kvn
parents:
570
diff
changeset
|
1212 } |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1213 if (load_base != NULL) { |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1214 Compile::AliasType* atp = phase->C->alias_type(load_base->adr_type()); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1215 intptr_t cache_offset; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1216 int shift = -1; |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1217 Node* cache = NULL; |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1218 if (is_autobox_cache(atp)) { |
29
d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
kvn
parents:
17
diff
changeset
|
1219 shift = exact_log2(type2aelembytes(T_OBJECT)); |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1220 cache = AddPNode::Ideal_base_and_offset(load_base->in(Address), phase, cache_offset); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1221 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1222 if (cache != NULL && base->in(Address)->is_AddP()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1223 Node* elements[4]; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1224 int count = base->in(Address)->as_AddP()->unpack_offsets(elements, ARRAY_SIZE(elements)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1225 int cache_low; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1226 if (count > 0 && fetch_autobox_base(atp, cache_low)) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1227 int offset = arrayOopDesc::base_offset_in_bytes(memory_type()) - (cache_low << shift); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1228 // Add up all the offsets making of the address of the load |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1229 Node* result = elements[0]; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1230 for (int i = 1; i < count; i++) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1231 result = phase->transform(new (phase->C, 3) AddXNode(result, elements[i])); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1232 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1233 // Remove the constant offset from the address and then |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1234 // remove the scaling of the offset to recover the original index. |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1235 result = phase->transform(new (phase->C, 3) AddXNode(result, phase->MakeConX(-offset))); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1236 if (result->Opcode() == Op_LShiftX && result->in(2) == phase->intcon(shift)) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1237 // Peel the shift off directly but wrap it in a dummy node |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1238 // since Ideal can't return existing nodes |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1239 result = new (phase->C, 3) RShiftXNode(result->in(1), phase->intcon(0)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1240 } else { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1241 result = new (phase->C, 3) RShiftXNode(result, phase->intcon(shift)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1242 } |
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1243 #ifdef _LP64 |
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1244 result = new (phase->C, 2) ConvL2INode(phase->transform(result)); |
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1245 #endif |
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1246 return result; |
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1247 } |
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1248 } |
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1249 } |
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1250 } |
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1251 return NULL; |
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1252 } |
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1253 |
163 | 1254 //------------------------------split_through_phi------------------------------ |
1255 // Split instance field load through Phi. | |
1256 Node *LoadNode::split_through_phi(PhaseGVN *phase) { | |
1257 Node* mem = in(MemNode::Memory); | |
1258 Node* address = in(MemNode::Address); | |
1259 const TypePtr *addr_t = phase->type(address)->isa_ptr(); | |
1260 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); | |
1261 | |
1262 assert(mem->is_Phi() && (t_oop != NULL) && | |
223 | 1263 t_oop->is_known_instance_field(), "invalide conditions"); |
163 | 1264 |
1265 Node *region = mem->in(0); | |
1266 if (region == NULL) { | |
1267 return NULL; // Wait stable graph | |
1268 } | |
1269 uint cnt = mem->req(); | |
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1270 for (uint i = 1; i < cnt; i++) { |
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1271 Node* rc = region->in(i); |
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1272 if (rc == NULL || phase->type(rc) == Type::TOP) |
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1273 return NULL; // Wait stable graph |
163 | 1274 Node *in = mem->in(i); |
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1275 if (in == NULL) { |
163 | 1276 return NULL; // Wait stable graph |
1277 } | |
1278 } | |
1279 // Check for loop invariant. | |
1280 if (cnt == 3) { | |
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1281 for (uint i = 1; i < cnt; i++) { |
163 | 1282 Node *in = mem->in(i); |
1283 Node* m = MemNode::optimize_memory_chain(in, addr_t, phase); | |
1284 if (m == mem) { | |
1285 set_req(MemNode::Memory, mem->in(cnt - i)); // Skip this phi. | |
1286 return this; | |
1287 } | |
1288 } | |
1289 } | |
1290 // Split through Phi (see original code in loopopts.cpp). | |
1291 assert(phase->C->have_alias_type(addr_t), "instance should have alias type"); | |
1292 | |
1293 // Do nothing here if Identity will find a value | |
1294 // (to avoid infinite chain of value phis generation). | |
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1295 if (!phase->eqv(this, this->Identity(phase))) |
163 | 1296 return NULL; |
1297 | |
1298 // Skip the split if the region dominates some control edge of the address. | |
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1299 if (!MemNode::all_controls_dominate(address, region)) |
163 | 1300 return NULL; |
1301 | |
1302 const Type* this_type = this->bottom_type(); | |
1303 int this_index = phase->C->get_alias_index(addr_t); | |
1304 int this_offset = addr_t->offset(); | |
1305 int this_iid = addr_t->is_oopptr()->instance_id(); | |
1306 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
1307 Node *phi = new (igvn->C, region->req()) PhiNode(region, this_type, NULL, this_iid, this_index, this_offset); | |
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1308 for (uint i = 1; i < region->req(); i++) { |
163 | 1309 Node *x; |
1310 Node* the_clone = NULL; | |
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1311 if (region->in(i) == phase->C->top()) { |
163 | 1312 x = phase->C->top(); // Dead path? Use a dead data op |
1313 } else { | |
1314 x = this->clone(); // Else clone up the data op | |
1315 the_clone = x; // Remember for possible deletion. | |
1316 // Alter data node to use pre-phi inputs | |
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1317 if (this->in(0) == region) { |
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1318 x->set_req(0, region->in(i)); |
163 | 1319 } else { |
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1320 x->set_req(0, NULL); |
163 | 1321 } |
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1322 for (uint j = 1; j < this->req(); j++) { |
163 | 1323 Node *in = this->in(j); |
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1324 if (in->is_Phi() && in->in(0) == region) |
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1325 x->set_req(j, in->in(i)); // Use pre-Phi input for the clone |
163 | 1326 } |
1327 } | |
1328 // Check for a 'win' on some paths | |
1329 const Type *t = x->Value(igvn); | |
1330 | |
1331 bool singleton = t->singleton(); | |
1332 | |
1333 // See comments in PhaseIdealLoop::split_thru_phi(). | |
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1334 if (singleton && t == Type::TOP) { |
163 | 1335 singleton &= region->is_Loop() && (i != LoopNode::EntryControl); |
1336 } | |
1337 | |
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1338 if (singleton) { |
163 | 1339 x = igvn->makecon(t); |
1340 } else { | |
1341 // We now call Identity to try to simplify the cloned node. | |
1342 // Note that some Identity methods call phase->type(this). | |
1343 // Make sure that the type array is big enough for | |
1344 // our new node, even though we may throw the node away. | |
1345 // (This tweaking with igvn only works because x is a new node.) | |
1346 igvn->set_type(x, t); | |
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1347 // If x is a TypeNode, capture any more-precise type permanently into Node |
605 | 1348 // otherwise it will be not updated during igvn->transform since |
293
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1349 // igvn->type(x) is set to x->Value() already. |
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1350 x->raise_bottom_type(t); |
163 | 1351 Node *y = x->Identity(igvn); |
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1352 if (y != x) { |
163 | 1353 x = y; |
1354 } else { | |
1355 y = igvn->hash_find(x); | |
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1356 if (y) { |
163 | 1357 x = y; |
1358 } else { | |
1359 // Else x is a new node we are keeping | |
1360 // We do not need register_new_node_with_optimizer | |
1361 // because set_type has already been called. | |
1362 igvn->_worklist.push(x); | |
1363 } | |
1364 } | |
1365 } | |
1366 if (x != the_clone && the_clone != NULL) | |
1367 igvn->remove_dead_node(the_clone); | |
1368 phi->set_req(i, x); | |
1369 } | |
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1370 // Record Phi |
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1371 igvn->register_new_node_with_optimizer(phi); |
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1372 return phi; |
163 | 1373 } |
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1374 |
0 | 1375 //------------------------------Ideal------------------------------------------ |
1376 // If the load is from Field memory and the pointer is non-null, we can | |
1377 // zero out the control input. | |
1378 // If the offset is constant and the base is an object allocation, | |
1379 // try to hook me up to the exact initializing store. | |
1380 Node *LoadNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1381 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
1382 if (p) return (p == NodeSentinel) ? NULL : p; | |
1383 | |
1384 Node* ctrl = in(MemNode::Control); | |
1385 Node* address = in(MemNode::Address); | |
1386 | |
1387 // Skip up past a SafePoint control. Cannot do this for Stores because | |
1388 // pointer stores & cardmarks must stay on the same side of a SafePoint. | |
1389 if( ctrl != NULL && ctrl->Opcode() == Op_SafePoint && | |
1390 phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw ) { | |
1391 ctrl = ctrl->in(0); | |
1392 set_req(MemNode::Control,ctrl); | |
1393 } | |
1394 | |
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1395 intptr_t ignore = 0; |
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1396 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); |
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1397 if (base != NULL |
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1398 && phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw) { |
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1399 // Check for useless control edge in some common special cases |
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1400 if (in(MemNode::Control) != NULL |
0 | 1401 && phase->type(base)->higher_equal(TypePtr::NOTNULL) |
119
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1402 && all_controls_dominate(base, phase->C->start())) { |
0 | 1403 // A method-invariant, non-null address (constant or 'this' argument). |
1404 set_req(MemNode::Control, NULL); | |
1405 } | |
708
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1406 |
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1407 if (EliminateAutoBox && can_reshape) { |
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1408 assert(!phase->type(base)->higher_equal(TypePtr::NULL_PTR), "the autobox pointer should be non-null"); |
17
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1409 Compile::AliasType* atp = phase->C->alias_type(adr_type()); |
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1410 if (is_autobox_object(atp)) { |
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1411 Node* result = eliminate_autobox(phase); |
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1412 if (result != NULL) return result; |
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1413 } |
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1414 } |
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1415 } |
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1416 |
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1417 Node* mem = in(MemNode::Memory); |
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1418 const TypePtr *addr_t = phase->type(address)->isa_ptr(); |
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1419 |
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1420 if (addr_t != NULL) { |
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1421 // try to optimize our memory input |
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1422 Node* opt_mem = MemNode::optimize_memory_chain(mem, addr_t, phase); |
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1423 if (opt_mem != mem) { |
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1424 set_req(MemNode::Memory, opt_mem); |
305 | 1425 if (phase->type( opt_mem ) == Type::TOP) return NULL; |
74
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1426 return this; |
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1427 } |
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1428 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); |
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1429 if (can_reshape && opt_mem->is_Phi() && |
223 | 1430 (t_oop != NULL) && t_oop->is_known_instance_field()) { |
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1431 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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1432 if (igvn != NULL && igvn->_worklist.member(opt_mem)) { |
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1433 // Delay this transformation until memory Phi is processed. |
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1434 phase->is_IterGVN()->_worklist.push(this); |
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1435 return NULL; |
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1436 } |
163 | 1437 // Split instance field load through Phi. |
1438 Node* result = split_through_phi(phase); | |
1439 if (result != NULL) return result; | |
74
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1440 } |
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1441 } |
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1442 |
0 | 1443 // Check for prior store with a different base or offset; make Load |
1444 // independent. Skip through any number of them. Bail out if the stores | |
1445 // are in an endless dead cycle and report no progress. This is a key | |
1446 // transform for Reflection. However, if after skipping through the Stores | |
1447 // we can't then fold up against a prior store do NOT do the transform as | |
1448 // this amounts to using the 'Oracle' model of aliasing. It leaves the same | |
1449 // array memory alive twice: once for the hoisted Load and again after the | |
1450 // bypassed Store. This situation only works if EVERYBODY who does | |
1451 // anti-dependence work knows how to bypass. I.e. we need all | |
1452 // anti-dependence checks to ask the same Oracle. Right now, that Oracle is | |
1453 // the alias index stuff. So instead, peek through Stores and IFF we can | |
1454 // fold up, do so. | |
1455 Node* prev_mem = find_previous_store(phase); | |
1456 // Steps (a), (b): Walk past independent stores to find an exact match. | |
1457 if (prev_mem != NULL && prev_mem != in(MemNode::Memory)) { | |
1458 // (c) See if we can fold up on the spot, but don't fold up here. | |
558
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1459 // Fold-up might require truncation (for LoadB/LoadS/LoadUS) or |
0 | 1460 // just return a prior value, which is done by Identity calls. |
1461 if (can_see_stored_value(prev_mem, phase)) { | |
1462 // Make ready for step (d): | |
1463 set_req(MemNode::Memory, prev_mem); | |
1464 return this; | |
1465 } | |
1466 } | |
1467 | |
1468 return NULL; // No further progress | |
1469 } | |
1470 | |
1471 // Helper to recognize certain Klass fields which are invariant across | |
1472 // some group of array types (e.g., int[] or all T[] where T < Object). | |
1473 const Type* | |
1474 LoadNode::load_array_final_field(const TypeKlassPtr *tkls, | |
1475 ciKlass* klass) const { | |
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1476 if (tkls->offset() == in_bytes(Klass::modifier_flags_offset())) { |
0 | 1477 // The field is Klass::_modifier_flags. Return its (constant) value. |
1478 // (Folds up the 2nd indirection in aClassConstant.getModifiers().) | |
1479 assert(this->Opcode() == Op_LoadI, "must load an int from _modifier_flags"); | |
1480 return TypeInt::make(klass->modifier_flags()); | |
1481 } | |
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1482 if (tkls->offset() == in_bytes(Klass::access_flags_offset())) { |
0 | 1483 // The field is Klass::_access_flags. Return its (constant) value. |
1484 // (Folds up the 2nd indirection in Reflection.getClassAccessFlags(aClassConstant).) | |
1485 assert(this->Opcode() == Op_LoadI, "must load an int from _access_flags"); | |
1486 return TypeInt::make(klass->access_flags()); | |
1487 } | |
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1488 if (tkls->offset() == in_bytes(Klass::layout_helper_offset())) { |
0 | 1489 // The field is Klass::_layout_helper. Return its constant value if known. |
1490 assert(this->Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1491 return TypeInt::make(klass->layout_helper()); | |
1492 } | |
1493 | |
1494 // No match. | |
1495 return NULL; | |
1496 } | |
1497 | |
1498 //------------------------------Value----------------------------------------- | |
1499 const Type *LoadNode::Value( PhaseTransform *phase ) const { | |
1500 // Either input is TOP ==> the result is TOP | |
1501 Node* mem = in(MemNode::Memory); | |
1502 const Type *t1 = phase->type(mem); | |
1503 if (t1 == Type::TOP) return Type::TOP; | |
1504 Node* adr = in(MemNode::Address); | |
1505 const TypePtr* tp = phase->type(adr)->isa_ptr(); | |
1506 if (tp == NULL || tp->empty()) return Type::TOP; | |
1507 int off = tp->offset(); | |
1508 assert(off != Type::OffsetTop, "case covered by TypePtr::empty"); | |
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1509 Compile* C = phase->C; |
0 | 1510 |
1511 // Try to guess loaded type from pointer type | |
1512 if (tp->base() == Type::AryPtr) { | |
1513 const Type *t = tp->is_aryptr()->elem(); | |
1514 // Don't do this for integer types. There is only potential profit if | |
1515 // the element type t is lower than _type; that is, for int types, if _type is | |
1516 // more restrictive than t. This only happens here if one is short and the other | |
1517 // char (both 16 bits), and in those cases we've made an intentional decision | |
1518 // to use one kind of load over the other. See AndINode::Ideal and 4965907. | |
1519 // Also, do not try to narrow the type for a LoadKlass, regardless of offset. | |
1520 // | |
1521 // Yes, it is possible to encounter an expression like (LoadKlass p1:(AddP x x 8)) | |
1522 // where the _gvn.type of the AddP is wider than 8. This occurs when an earlier | |
1523 // copy p0 of (AddP x x 8) has been proven equal to p1, and the p0 has been | |
1524 // subsumed by p1. If p1 is on the worklist but has not yet been re-transformed, | |
1525 // it is possible that p1 will have a type like Foo*[int+]:NotNull*+any. | |
1526 // In fact, that could have been the original type of p1, and p1 could have | |
1527 // had an original form like p1:(AddP x x (LShiftL quux 3)), where the | |
1528 // expression (LShiftL quux 3) independently optimized to the constant 8. | |
1529 if ((t->isa_int() == NULL) && (t->isa_long() == NULL) | |
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1530 && Opcode() != Op_LoadKlass && Opcode() != Op_LoadNKlass) { |
0 | 1531 // t might actually be lower than _type, if _type is a unique |
1532 // concrete subclass of abstract class t. | |
1533 // Make sure the reference is not into the header, by comparing | |
1534 // the offset against the offset of the start of the array's data. | |
1535 // Different array types begin at slightly different offsets (12 vs. 16). | |
1536 // We choose T_BYTE as an example base type that is least restrictive | |
1537 // as to alignment, which will therefore produce the smallest | |
1538 // possible base offset. | |
1539 const int min_base_off = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
1540 if ((uint)off >= (uint)min_base_off) { // is the offset beyond the header? | |
1541 const Type* jt = t->join(_type); | |
1542 // In any case, do not allow the join, per se, to empty out the type. | |
1543 if (jt->empty() && !t->empty()) { | |
1544 // This can happen if a interface-typed array narrows to a class type. | |
1545 jt = _type; | |
1546 } | |
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1547 |
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1548 if (EliminateAutoBox && adr->is_AddP()) { |
17
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1549 // The pointers in the autobox arrays are always non-null |
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1550 Node* base = adr->in(AddPNode::Base); |
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1551 if (base != NULL && |
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1552 !phase->type(base)->higher_equal(TypePtr::NULL_PTR)) { |
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1553 Compile::AliasType* atp = C->alias_type(base->adr_type()); |
17
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1554 if (is_autobox_cache(atp)) { |
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1555 return jt->join(TypePtr::NOTNULL)->is_ptr(); |
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1556 } |
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1557 } |
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1558 } |
0 | 1559 return jt; |
1560 } | |
1561 } | |
1562 } else if (tp->base() == Type::InstPtr) { | |
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1563 ciEnv* env = C->env(); |
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1564 const TypeInstPtr* tinst = tp->is_instptr(); |
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1565 ciKlass* klass = tinst->klass(); |
0 | 1566 assert( off != Type::OffsetBot || |
1567 // arrays can be cast to Objects | |
1568 tp->is_oopptr()->klass()->is_java_lang_Object() || | |
1569 // unsafe field access may not have a constant offset | |
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1570 C->has_unsafe_access(), |
0 | 1571 "Field accesses must be precise" ); |
1572 // For oop loads, we expect the _type to be precise | |
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1573 if (klass == env->String_klass() && |
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1574 adr->is_AddP() && off != Type::OffsetBot) { |
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1575 // For constant Strings treat the final fields as compile time constants. |
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1576 Node* base = adr->in(AddPNode::Base); |
1766
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1577 const TypeOopPtr* t = phase->type(base)->isa_oopptr(); |
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1578 if (t != NULL && t->singleton()) { |
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1579 ciField* field = env->String_klass()->get_field_by_offset(off, false); |
2320
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1580 if (field != NULL && field->is_final()) { |
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1581 ciObject* string = t->const_oop(); |
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1582 ciConstant constant = string->as_instance()->field_value(field); |
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1583 if (constant.basic_type() == T_INT) { |
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1584 return TypeInt::make(constant.as_int()); |
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1585 } else if (constant.basic_type() == T_ARRAY) { |
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1586 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
2379
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1587 return TypeNarrowOop::make_from_constant(constant.as_object(), true); |
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1588 } else { |
2379
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1589 return TypeOopPtr::make_from_constant(constant.as_object(), true); |
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1590 } |
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1591 } |
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1592 } |
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1593 } |
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1594 } |
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1595 // Optimizations for constant objects |
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1596 ciObject* const_oop = tinst->const_oop(); |
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1597 if (const_oop != NULL) { |
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1598 // For constant CallSites treat the target field as a compile time constant. |
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1599 if (const_oop->is_call_site()) { |
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1600 ciCallSite* call_site = const_oop->as_call_site(); |
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1601 ciField* field = call_site->klass()->as_instance_klass()->get_field_by_offset(off, /*is_static=*/ false); |
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1602 if (field != NULL && field->is_call_site_target()) { |
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1603 ciMethodHandle* target = call_site->get_target(); |
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1604 if (target != NULL) { // just in case |
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1605 ciConstant constant(T_OBJECT, target); |
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1606 const Type* t; |
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1607 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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1608 t = TypeNarrowOop::make_from_constant(constant.as_object(), true); |
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1609 } else { |
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1610 t = TypeOopPtr::make_from_constant(constant.as_object(), true); |
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1611 } |
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1612 // Add a dependence for invalidation of the optimization. |
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1613 if (!call_site->is_constant_call_site()) { |
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1614 C->dependencies()->assert_call_site_target_value(call_site, target); |
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1615 } |
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1616 return t; |
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1617 } |
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1618 } |
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1619 } |
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1620 } |
0 | 1621 } else if (tp->base() == Type::KlassPtr) { |
1622 assert( off != Type::OffsetBot || | |
1623 // arrays can be cast to Objects | |
1624 tp->is_klassptr()->klass()->is_java_lang_Object() || | |
1625 // also allow array-loading from the primary supertype | |
1626 // array during subtype checks | |
1627 Opcode() == Op_LoadKlass, | |
1628 "Field accesses must be precise" ); | |
1629 // For klass/static loads, we expect the _type to be precise | |
1630 } | |
1631 | |
1632 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1633 if (tkls != NULL && !StressReflectiveCode) { | |
1634 ciKlass* klass = tkls->klass(); | |
1635 if (klass->is_loaded() && tkls->klass_is_exact()) { | |
1636 // We are loading a field from a Klass metaobject whose identity | |
1637 // is known at compile time (the type is "exact" or "precise"). | |
1638 // Check for fields we know are maintained as constants by the VM. | |
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1639 if (tkls->offset() == in_bytes(Klass::super_check_offset_offset())) { |
0 | 1640 // The field is Klass::_super_check_offset. Return its (constant) value. |
1641 // (Folds up type checking code.) | |
1642 assert(Opcode() == Op_LoadI, "must load an int from _super_check_offset"); | |
1643 return TypeInt::make(klass->super_check_offset()); | |
1644 } | |
1645 // Compute index into primary_supers array | |
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1646 juint depth = (tkls->offset() - in_bytes(Klass::primary_supers_offset())) / sizeof(klassOop); |
0 | 1647 // Check for overflowing; use unsigned compare to handle the negative case. |
1648 if( depth < ciKlass::primary_super_limit() ) { | |
1649 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1650 // (Folds up type checking code.) | |
1651 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1652 ciKlass *ss = klass->super_of_depth(depth); | |
1653 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1654 } | |
1655 const Type* aift = load_array_final_field(tkls, klass); | |
1656 if (aift != NULL) return aift; | |
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1657 if (tkls->offset() == in_bytes(arrayKlass::component_mirror_offset()) |
0 | 1658 && klass->is_array_klass()) { |
1659 // The field is arrayKlass::_component_mirror. Return its (constant) value. | |
1660 // (Folds up aClassConstant.getComponentType, common in Arrays.copyOf.) | |
1661 assert(Opcode() == Op_LoadP, "must load an oop from _component_mirror"); | |
1662 return TypeInstPtr::make(klass->as_array_klass()->component_mirror()); | |
1663 } | |
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1664 if (tkls->offset() == in_bytes(Klass::java_mirror_offset())) { |
0 | 1665 // The field is Klass::_java_mirror. Return its (constant) value. |
1666 // (Folds up the 2nd indirection in anObjConstant.getClass().) | |
1667 assert(Opcode() == Op_LoadP, "must load an oop from _java_mirror"); | |
1668 return TypeInstPtr::make(klass->java_mirror()); | |
1669 } | |
1670 } | |
1671 | |
1672 // We can still check if we are loading from the primary_supers array at a | |
1673 // shallow enough depth. Even though the klass is not exact, entries less | |
1674 // than or equal to its super depth are correct. | |
1675 if (klass->is_loaded() ) { | |
1676 ciType *inner = klass->klass(); | |
1677 while( inner->is_obj_array_klass() ) | |
1678 inner = inner->as_obj_array_klass()->base_element_type(); | |
1679 if( inner->is_instance_klass() && | |
1680 !inner->as_instance_klass()->flags().is_interface() ) { | |
1681 // Compute index into primary_supers array | |
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1682 juint depth = (tkls->offset() - in_bytes(Klass::primary_supers_offset())) / sizeof(klassOop); |
0 | 1683 // Check for overflowing; use unsigned compare to handle the negative case. |
1684 if( depth < ciKlass::primary_super_limit() && | |
1685 depth <= klass->super_depth() ) { // allow self-depth checks to handle self-check case | |
1686 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1687 // (Folds up type checking code.) | |
1688 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1689 ciKlass *ss = klass->super_of_depth(depth); | |
1690 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1691 } | |
1692 } | |
1693 } | |
1694 | |
1695 // If the type is enough to determine that the thing is not an array, | |
1696 // we can give the layout_helper a positive interval type. | |
1697 // This will help short-circuit some reflective code. | |
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1698 if (tkls->offset() == in_bytes(Klass::layout_helper_offset()) |
0 | 1699 && !klass->is_array_klass() // not directly typed as an array |
1700 && !klass->is_interface() // specifically not Serializable & Cloneable | |
1701 && !klass->is_java_lang_Object() // not the supertype of all T[] | |
1702 ) { | |
1703 // Note: When interfaces are reliable, we can narrow the interface | |
1704 // test to (klass != Serializable && klass != Cloneable). | |
1705 assert(Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1706 jint min_size = Klass::instance_layout_helper(oopDesc::header_size(), false); | |
1707 // The key property of this type is that it folds up tests | |
1708 // for array-ness, since it proves that the layout_helper is positive. | |
1709 // Thus, a generic value like the basic object layout helper works fine. | |
1710 return TypeInt::make(min_size, max_jint, Type::WidenMin); | |
1711 } | |
1712 } | |
1713 | |
1714 // If we are loading from a freshly-allocated object, produce a zero, | |
1715 // if the load is provably beyond the header of the object. | |
1716 // (Also allow a variable load from a fresh array to produce zero.) | |
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1717 const TypeOopPtr *tinst = tp->isa_oopptr(); |
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1718 bool is_instance = (tinst != NULL) && tinst->is_known_instance_field(); |
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1719 if (ReduceFieldZeroing || is_instance) { |
0 | 1720 Node* value = can_see_stored_value(mem,phase); |
1721 if (value != NULL && value->is_Con()) | |
1722 return value->bottom_type(); | |
1723 } | |
1724 | |
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1725 if (is_instance) { |
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1726 // If we have an instance type and our memory input is the |
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1727 // programs's initial memory state, there is no matching store, |
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1728 // so just return a zero of the appropriate type |
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1729 Node *mem = in(MemNode::Memory); |
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1730 if (mem->is_Parm() && mem->in(0)->is_Start()) { |
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1731 assert(mem->as_Parm()->_con == TypeFunc::Memory, "must be memory Parm"); |
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1732 return Type::get_zero_type(_type->basic_type()); |
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1733 } |
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1734 } |
0 | 1735 return _type; |
1736 } | |
1737 | |
1738 //------------------------------match_edge------------------------------------- | |
1739 // Do we Match on this edge index or not? Match only the address. | |
1740 uint LoadNode::match_edge(uint idx) const { | |
1741 return idx == MemNode::Address; | |
1742 } | |
1743 | |
1744 //--------------------------LoadBNode::Ideal-------------------------------------- | |
1745 // | |
1746 // If the previous store is to the same address as this load, | |
1747 // and the value stored was larger than a byte, replace this load | |
1748 // with the value stored truncated to a byte. If no truncation is | |
1749 // needed, the replacement is done in LoadNode::Identity(). | |
1750 // | |
1751 Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1752 Node* mem = in(MemNode::Memory); | |
1753 Node* value = can_see_stored_value(mem,phase); | |
1754 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1755 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(24)) ); | |
1756 return new (phase->C, 3) RShiftINode(result, phase->intcon(24)); | |
1757 } | |
1758 // Identity call will handle the case where truncation is not needed. | |
1759 return LoadNode::Ideal(phase, can_reshape); | |
1760 } | |
1761 | |
624 | 1762 //--------------------------LoadUBNode::Ideal------------------------------------- |
1763 // | |
1764 // If the previous store is to the same address as this load, | |
1765 // and the value stored was larger than a byte, replace this load | |
1766 // with the value stored truncated to a byte. If no truncation is | |
1767 // needed, the replacement is done in LoadNode::Identity(). | |
1768 // | |
1769 Node* LoadUBNode::Ideal(PhaseGVN* phase, bool can_reshape) { | |
1770 Node* mem = in(MemNode::Memory); | |
1771 Node* value = can_see_stored_value(mem, phase); | |
1772 if (value && !phase->type(value)->higher_equal(_type)) | |
1773 return new (phase->C, 3) AndINode(value, phase->intcon(0xFF)); | |
1774 // Identity call will handle the case where truncation is not needed. | |
1775 return LoadNode::Ideal(phase, can_reshape); | |
1776 } | |
1777 | |
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1778 //--------------------------LoadUSNode::Ideal------------------------------------- |
0 | 1779 // |
1780 // If the previous store is to the same address as this load, | |
1781 // and the value stored was larger than a char, replace this load | |
1782 // with the value stored truncated to a char. If no truncation is | |
1783 // needed, the replacement is done in LoadNode::Identity(). | |
1784 // | |
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1785 Node *LoadUSNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
0 | 1786 Node* mem = in(MemNode::Memory); |
1787 Node* value = can_see_stored_value(mem,phase); | |
1788 if( value && !phase->type(value)->higher_equal( _type ) ) | |
1789 return new (phase->C, 3) AndINode(value,phase->intcon(0xFFFF)); | |
1790 // Identity call will handle the case where truncation is not needed. | |
1791 return LoadNode::Ideal(phase, can_reshape); | |
1792 } | |
1793 | |
1794 //--------------------------LoadSNode::Ideal-------------------------------------- | |
1795 // | |
1796 // If the previous store is to the same address as this load, | |
1797 // and the value stored was larger than a short, replace this load | |
1798 // with the value stored truncated to a short. If no truncation is | |
1799 // needed, the replacement is done in LoadNode::Identity(). | |
1800 // | |
1801 Node *LoadSNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1802 Node* mem = in(MemNode::Memory); | |
1803 Node* value = can_see_stored_value(mem,phase); | |
1804 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1805 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(16)) ); | |
1806 return new (phase->C, 3) RShiftINode(result, phase->intcon(16)); | |
1807 } | |
1808 // Identity call will handle the case where truncation is not needed. | |
1809 return LoadNode::Ideal(phase, can_reshape); | |
1810 } | |
1811 | |
1812 //============================================================================= | |
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1813 //----------------------------LoadKlassNode::make------------------------------ |
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1814 // Polymorphic factory method: |
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1815 Node *LoadKlassNode::make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, const TypeKlassPtr *tk ) { |
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1816 Compile* C = gvn.C; |
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1817 Node *ctl = NULL; |
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1818 // sanity check the alias category against the created node type |
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1819 const TypeOopPtr *adr_type = adr->bottom_type()->isa_oopptr(); |
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1820 assert(adr_type != NULL, "expecting TypeOopPtr"); |
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1821 #ifdef _LP64 |
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1822 if (adr_type->is_ptr_to_narrowoop()) { |
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1823 Node* load_klass = gvn.transform(new (C, 3) LoadNKlassNode(ctl, mem, adr, at, tk->make_narrowoop())); |
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1824 return new (C, 2) DecodeNNode(load_klass, load_klass->bottom_type()->make_ptr()); |
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1825 } |
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1826 #endif |
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1827 assert(!adr_type->is_ptr_to_narrowoop(), "should have got back a narrow oop"); |
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1828 return new (C, 3) LoadKlassNode(ctl, mem, adr, at, tk); |
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1829 } |
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1830 |
0 | 1831 //------------------------------Value------------------------------------------ |
1832 const Type *LoadKlassNode::Value( PhaseTransform *phase ) const { | |
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1833 return klass_value_common(phase); |
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1834 } |
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1835 |
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1836 const Type *LoadNode::klass_value_common( PhaseTransform *phase ) const { |
0 | 1837 // Either input is TOP ==> the result is TOP |
1838 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1839 if (t1 == Type::TOP) return Type::TOP; | |
1840 Node *adr = in(MemNode::Address); | |
1841 const Type *t2 = phase->type( adr ); | |
1842 if (t2 == Type::TOP) return Type::TOP; | |
1843 const TypePtr *tp = t2->is_ptr(); | |
1844 if (TypePtr::above_centerline(tp->ptr()) || | |
1845 tp->ptr() == TypePtr::Null) return Type::TOP; | |
1846 | |
1847 // Return a more precise klass, if possible | |
1848 const TypeInstPtr *tinst = tp->isa_instptr(); | |
1849 if (tinst != NULL) { | |
1850 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
1851 int offset = tinst->offset(); | |
1852 if (ik == phase->C->env()->Class_klass() | |
1853 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
1854 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
1855 // We are loading a special hidden field from a Class mirror object, | |
1856 // the field which points to the VM's Klass metaobject. | |
1857 ciType* t = tinst->java_mirror_type(); | |
1858 // java_mirror_type returns non-null for compile-time Class constants. | |
1859 if (t != NULL) { | |
1860 // constant oop => constant klass | |
1861 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
1862 return TypeKlassPtr::make(ciArrayKlass::make(t)); | |
1863 } | |
1864 if (!t->is_klass()) { | |
1865 // a primitive Class (e.g., int.class) has NULL for a klass field | |
1866 return TypePtr::NULL_PTR; | |
1867 } | |
1868 // (Folds up the 1st indirection in aClassConstant.getModifiers().) | |
1869 return TypeKlassPtr::make(t->as_klass()); | |
1870 } | |
1871 // non-constant mirror, so we can't tell what's going on | |
1872 } | |
1873 if( !ik->is_loaded() ) | |
1874 return _type; // Bail out if not loaded | |
1875 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1876 if (tinst->klass_is_exact()) { | |
1877 return TypeKlassPtr::make(ik); | |
1878 } | |
1879 // See if we can become precise: no subklasses and no interface | |
1880 // (Note: We need to support verified interfaces.) | |
1881 if (!ik->is_interface() && !ik->has_subklass()) { | |
1882 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1883 // Add a dependence; if any subclass added we need to recompile | |
1884 if (!ik->is_final()) { | |
1885 // %%% should use stronger assert_unique_concrete_subtype instead | |
1886 phase->C->dependencies()->assert_leaf_type(ik); | |
1887 } | |
1888 // Return precise klass | |
1889 return TypeKlassPtr::make(ik); | |
1890 } | |
1891 | |
1892 // Return root of possible klass | |
1893 return TypeKlassPtr::make(TypePtr::NotNull, ik, 0/*offset*/); | |
1894 } | |
1895 } | |
1896 | |
1897 // Check for loading klass from an array | |
1898 const TypeAryPtr *tary = tp->isa_aryptr(); | |
1899 if( tary != NULL ) { | |
1900 ciKlass *tary_klass = tary->klass(); | |
1901 if (tary_klass != NULL // can be NULL when at BOTTOM or TOP | |
1902 && tary->offset() == oopDesc::klass_offset_in_bytes()) { | |
1903 if (tary->klass_is_exact()) { | |
1904 return TypeKlassPtr::make(tary_klass); | |
1905 } | |
1906 ciArrayKlass *ak = tary->klass()->as_array_klass(); | |
1907 // If the klass is an object array, we defer the question to the | |
1908 // array component klass. | |
1909 if( ak->is_obj_array_klass() ) { | |
1910 assert( ak->is_loaded(), "" ); | |
1911 ciKlass *base_k = ak->as_obj_array_klass()->base_element_klass(); | |
1912 if( base_k->is_loaded() && base_k->is_instance_klass() ) { | |
1913 ciInstanceKlass* ik = base_k->as_instance_klass(); | |
1914 // See if we can become precise: no subklasses and no interface | |
1915 if (!ik->is_interface() && !ik->has_subklass()) { | |
1916 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1917 // Add a dependence; if any subclass added we need to recompile | |
1918 if (!ik->is_final()) { | |
1919 phase->C->dependencies()->assert_leaf_type(ik); | |
1920 } | |
1921 // Return precise array klass | |
1922 return TypeKlassPtr::make(ak); | |
1923 } | |
1924 } | |
1925 return TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
1926 } else { // Found a type-array? | |
1927 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1928 assert( ak->is_type_array_klass(), "" ); | |
1929 return TypeKlassPtr::make(ak); // These are always precise | |
1930 } | |
1931 } | |
1932 } | |
1933 | |
1934 // Check for loading klass from an array klass | |
1935 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1936 if (tkls != NULL && !StressReflectiveCode) { | |
1937 ciKlass* klass = tkls->klass(); | |
1938 if( !klass->is_loaded() ) | |
1939 return _type; // Bail out if not loaded | |
1940 if( klass->is_obj_array_klass() && | |
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1941 tkls->offset() == in_bytes(objArrayKlass::element_klass_offset())) { |
0 | 1942 ciKlass* elem = klass->as_obj_array_klass()->element_klass(); |
1943 // // Always returning precise element type is incorrect, | |
1944 // // e.g., element type could be object and array may contain strings | |
1945 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0); | |
1946 | |
1947 // The array's TypeKlassPtr was declared 'precise' or 'not precise' | |
1948 // according to the element type's subclassing. | |
1949 return TypeKlassPtr::make(tkls->ptr(), elem, 0/*offset*/); | |
1950 } | |
1951 if( klass->is_instance_klass() && tkls->klass_is_exact() && | |
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1952 tkls->offset() == in_bytes(Klass::super_offset())) { |
0 | 1953 ciKlass* sup = klass->as_instance_klass()->super(); |
1954 // The field is Klass::_super. Return its (constant) value. | |
1955 // (Folds up the 2nd indirection in aClassConstant.getSuperClass().) | |
1956 return sup ? TypeKlassPtr::make(sup) : TypePtr::NULL_PTR; | |
1957 } | |
1958 } | |
1959 | |
1960 // Bailout case | |
1961 return LoadNode::Value(phase); | |
1962 } | |
1963 | |
1964 //------------------------------Identity--------------------------------------- | |
1965 // To clean up reflective code, simplify k.java_mirror.as_klass to plain k. | |
1966 // Also feed through the klass in Allocate(...klass...)._klass. | |
1967 Node* LoadKlassNode::Identity( PhaseTransform *phase ) { | |
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1968 return klass_identity_common(phase); |
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1969 } |
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1970 |
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1971 Node* LoadNode::klass_identity_common(PhaseTransform *phase ) { |
0 | 1972 Node* x = LoadNode::Identity(phase); |
1973 if (x != this) return x; | |
1974 | |
1975 // Take apart the address into an oop and and offset. | |
1976 // Return 'this' if we cannot. | |
1977 Node* adr = in(MemNode::Address); | |
1978 intptr_t offset = 0; | |
1979 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
1980 if (base == NULL) return this; | |
1981 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr(); | |
1982 if (toop == NULL) return this; | |
1983 | |
1984 // We can fetch the klass directly through an AllocateNode. | |
1985 // This works even if the klass is not constant (clone or newArray). | |
1986 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1987 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase); | |
1988 if (allocated_klass != NULL) { | |
1989 return allocated_klass; | |
1990 } | |
1991 } | |
1992 | |
1993 // Simplify k.java_mirror.as_klass to plain k, where k is a klassOop. | |
1994 // Simplify ak.component_mirror.array_klass to plain ak, ak an arrayKlass. | |
1995 // See inline_native_Class_query for occurrences of these patterns. | |
1996 // Java Example: x.getClass().isAssignableFrom(y) | |
1997 // Java Example: Array.newInstance(x.getClass().getComponentType(), n) | |
1998 // | |
1999 // This improves reflective code, often making the Class | |
2000 // mirror go completely dead. (Current exception: Class | |
2001 // mirrors may appear in debug info, but we could clean them out by | |
2002 // introducing a new debug info operator for klassOop.java_mirror). | |
2003 if (toop->isa_instptr() && toop->klass() == phase->C->env()->Class_klass() | |
2004 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
2005 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
2006 // We are loading a special hidden field from a Class mirror, | |
2007 // the field which points to its Klass or arrayKlass metaobject. | |
2008 if (base->is_Load()) { | |
2009 Node* adr2 = base->in(MemNode::Address); | |
2010 const TypeKlassPtr* tkls = phase->type(adr2)->isa_klassptr(); | |
2011 if (tkls != NULL && !tkls->empty() | |
2012 && (tkls->klass()->is_instance_klass() || | |
2013 tkls->klass()->is_array_klass()) | |
2014 && adr2->is_AddP() | |
2015 ) { | |
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2016 int mirror_field = in_bytes(Klass::java_mirror_offset()); |
0 | 2017 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { |
2018 mirror_field = in_bytes(arrayKlass::component_mirror_offset()); | |
2019 } | |
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2020 if (tkls->offset() == mirror_field) { |
0 | 2021 return adr2->in(AddPNode::Base); |
2022 } | |
2023 } | |
2024 } | |
2025 } | |
2026 | |
2027 return this; | |
2028 } | |
2029 | |
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2030 |
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2031 //------------------------------Value------------------------------------------ |
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2032 const Type *LoadNKlassNode::Value( PhaseTransform *phase ) const { |
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2033 const Type *t = klass_value_common(phase); |
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2034 if (t == Type::TOP) |
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2035 return t; |
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2036 |
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2037 return t->make_narrowoop(); |
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2038 } |
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2039 |
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2040 //------------------------------Identity--------------------------------------- |
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2041 // To clean up reflective code, simplify k.java_mirror.as_klass to narrow k. |
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2042 // Also feed through the klass in Allocate(...klass...)._klass. |
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2043 Node* LoadNKlassNode::Identity( PhaseTransform *phase ) { |
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2044 Node *x = klass_identity_common(phase); |
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2045 |
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2046 const Type *t = phase->type( x ); |
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2047 if( t == Type::TOP ) return x; |
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2048 if( t->isa_narrowoop()) return x; |
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2049 |
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2050 return phase->transform(new (phase->C, 2) EncodePNode(x, t->make_narrowoop())); |
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2051 } |
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2052 |
0 | 2053 //------------------------------Value----------------------------------------- |
2054 const Type *LoadRangeNode::Value( PhaseTransform *phase ) const { | |
2055 // Either input is TOP ==> the result is TOP | |
2056 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2057 if( t1 == Type::TOP ) return Type::TOP; | |
2058 Node *adr = in(MemNode::Address); | |
2059 const Type *t2 = phase->type( adr ); | |
2060 if( t2 == Type::TOP ) return Type::TOP; | |
2061 const TypePtr *tp = t2->is_ptr(); | |
2062 if (TypePtr::above_centerline(tp->ptr())) return Type::TOP; | |
2063 const TypeAryPtr *tap = tp->isa_aryptr(); | |
2064 if( !tap ) return _type; | |
2065 return tap->size(); | |
2066 } | |
2067 | |
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2068 //-------------------------------Ideal--------------------------------------- |
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2069 // Feed through the length in AllocateArray(...length...)._length. |
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2070 Node *LoadRangeNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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2071 Node* p = MemNode::Ideal_common(phase, can_reshape); |
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2072 if (p) return (p == NodeSentinel) ? NULL : p; |
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2073 |
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2074 // Take apart the address into an oop and and offset. |
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2075 // Return 'this' if we cannot. |
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2076 Node* adr = in(MemNode::Address); |
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2077 intptr_t offset = 0; |
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2078 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); |
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2079 if (base == NULL) return NULL; |
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2080 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); |
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2081 if (tary == NULL) return NULL; |
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2082 |
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2083 // We can fetch the length directly through an AllocateArrayNode. |
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2084 // This works even if the length is not constant (clone or newArray). |
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2085 if (offset == arrayOopDesc::length_offset_in_bytes()) { |
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2086 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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2087 if (alloc != NULL) { |
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2088 Node* allocated_length = alloc->Ideal_length(); |
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2089 Node* len = alloc->make_ideal_length(tary, phase); |
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2090 if (allocated_length != len) { |
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2091 // New CastII improves on this. |
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2092 return len; |
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2093 } |
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2094 } |
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2095 } |
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2096 |
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2097 return NULL; |
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2098 } |
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2099 |
0 | 2100 //------------------------------Identity--------------------------------------- |
2101 // Feed through the length in AllocateArray(...length...)._length. | |
2102 Node* LoadRangeNode::Identity( PhaseTransform *phase ) { | |
2103 Node* x = LoadINode::Identity(phase); | |
2104 if (x != this) return x; | |
2105 | |
2106 // Take apart the address into an oop and and offset. | |
2107 // Return 'this' if we cannot. | |
2108 Node* adr = in(MemNode::Address); | |
2109 intptr_t offset = 0; | |
2110 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
2111 if (base == NULL) return this; | |
2112 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); | |
2113 if (tary == NULL) return this; | |
2114 | |
2115 // We can fetch the length directly through an AllocateArrayNode. | |
2116 // This works even if the length is not constant (clone or newArray). | |
2117 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
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2118 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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2119 if (alloc != NULL) { |
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2120 Node* allocated_length = alloc->Ideal_length(); |
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2121 // Do not allow make_ideal_length to allocate a CastII node. |
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2122 Node* len = alloc->make_ideal_length(tary, phase, false); |
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2123 if (allocated_length == len) { |
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2124 // Return allocated_length only if it would not be improved by a CastII. |
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2125 return allocated_length; |
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2126 } |
0 | 2127 } |
2128 } | |
2129 | |
2130 return this; | |
2131 | |
2132 } | |
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2133 |
0 | 2134 //============================================================================= |
2135 //---------------------------StoreNode::make----------------------------------- | |
2136 // Polymorphic factory method: | |
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2137 StoreNode* StoreNode::make( PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, BasicType bt ) { |
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2138 Compile* C = gvn.C; |
1609 | 2139 assert( C->get_alias_index(adr_type) != Compile::AliasIdxRaw || |
2140 ctl != NULL, "raw memory operations should have control edge"); | |
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2141 |
0 | 2142 switch (bt) { |
2143 case T_BOOLEAN: | |
2144 case T_BYTE: return new (C, 4) StoreBNode(ctl, mem, adr, adr_type, val); | |
2145 case T_INT: return new (C, 4) StoreINode(ctl, mem, adr, adr_type, val); | |
2146 case T_CHAR: | |
2147 case T_SHORT: return new (C, 4) StoreCNode(ctl, mem, adr, adr_type, val); | |
2148 case T_LONG: return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val); | |
2149 case T_FLOAT: return new (C, 4) StoreFNode(ctl, mem, adr, adr_type, val); | |
2150 case T_DOUBLE: return new (C, 4) StoreDNode(ctl, mem, adr, adr_type, val); | |
2151 case T_ADDRESS: | |
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2152 case T_OBJECT: |
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2153 #ifdef _LP64 |
163 | 2154 if (adr->bottom_type()->is_ptr_to_narrowoop() || |
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2155 (UseCompressedOops && val->bottom_type()->isa_klassptr() && |
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2156 adr->bottom_type()->isa_rawptr())) { |
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2157 val = gvn.transform(new (C, 2) EncodePNode(val, val->bottom_type()->make_narrowoop())); |
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2158 return new (C, 4) StoreNNode(ctl, mem, adr, adr_type, val); |
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2159 } else |
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2160 #endif |
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2161 { |
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2162 return new (C, 4) StorePNode(ctl, mem, adr, adr_type, val); |
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2163 } |
0 | 2164 } |
2165 ShouldNotReachHere(); | |
2166 return (StoreNode*)NULL; | |
2167 } | |
2168 | |
2169 StoreLNode* StoreLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val) { | |
2170 bool require_atomic = true; | |
2171 return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val, require_atomic); | |
2172 } | |
2173 | |
2174 | |
2175 //--------------------------bottom_type---------------------------------------- | |
2176 const Type *StoreNode::bottom_type() const { | |
2177 return Type::MEMORY; | |
2178 } | |
2179 | |
2180 //------------------------------hash------------------------------------------- | |
2181 uint StoreNode::hash() const { | |
2182 // unroll addition of interesting fields | |
2183 //return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address) + (uintptr_t)in(ValueIn); | |
2184 | |
2185 // Since they are not commoned, do not hash them: | |
2186 return NO_HASH; | |
2187 } | |
2188 | |
2189 //------------------------------Ideal------------------------------------------ | |
2190 // Change back-to-back Store(, p, x) -> Store(m, p, y) to Store(m, p, x). | |
2191 // When a store immediately follows a relevant allocation/initialization, | |
2192 // try to capture it into the initialization, or hoist it above. | |
2193 Node *StoreNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
2194 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
2195 if (p) return (p == NodeSentinel) ? NULL : p; | |
2196 | |
2197 Node* mem = in(MemNode::Memory); | |
2198 Node* address = in(MemNode::Address); | |
2199 | |
3248
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2200 // Back-to-back stores to same address? Fold em up. Generally |
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2201 // unsafe if I have intervening uses... Also disallowed for StoreCM |
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2202 // since they must follow each StoreP operation. Redundant StoreCMs |
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|
2203 // are eliminated just before matching in final_graph_reshape. |
4778 | 2204 if (mem->is_Store() && mem->in(MemNode::Address)->eqv_uncast(address) && |
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2205 mem->Opcode() != Op_StoreCM) { |
0 | 2206 // Looking at a dead closed cycle of memory? |
2207 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal"); | |
2208 | |
2209 assert(Opcode() == mem->Opcode() || | |
2210 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw, | |
2211 "no mismatched stores, except on raw memory"); | |
2212 | |
2213 if (mem->outcnt() == 1 && // check for intervening uses | |
2214 mem->as_Store()->memory_size() <= this->memory_size()) { | |
2215 // If anybody other than 'this' uses 'mem', we cannot fold 'mem' away. | |
2216 // For example, 'mem' might be the final state at a conditional return. | |
2217 // Or, 'mem' might be used by some node which is live at the same time | |
2218 // 'this' is live, which might be unschedulable. So, require exactly | |
2219 // ONE user, the 'this' store, until such time as we clone 'mem' for | |
2220 // each of 'mem's uses (thus making the exactly-1-user-rule hold true). | |
2221 if (can_reshape) { // (%%% is this an anachronism?) | |
2222 set_req_X(MemNode::Memory, mem->in(MemNode::Memory), | |
2223 phase->is_IterGVN()); | |
2224 } else { | |
2225 // It's OK to do this in the parser, since DU info is always accurate, | |
2226 // and the parser always refers to nodes via SafePointNode maps. | |
2227 set_req(MemNode::Memory, mem->in(MemNode::Memory)); | |
2228 } | |
2229 return this; | |
2230 } | |
2231 } | |
2232 | |
2233 // Capture an unaliased, unconditional, simple store into an initializer. | |
2234 // Or, if it is independent of the allocation, hoist it above the allocation. | |
2235 if (ReduceFieldZeroing && /*can_reshape &&*/ | |
2236 mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
2237 InitializeNode* init = mem->in(0)->as_Initialize(); | |
2238 intptr_t offset = init->can_capture_store(this, phase); | |
2239 if (offset > 0) { | |
2240 Node* moved = init->capture_store(this, offset, phase); | |
2241 // If the InitializeNode captured me, it made a raw copy of me, | |
2242 // and I need to disappear. | |
2243 if (moved != NULL) { | |
2244 // %%% hack to ensure that Ideal returns a new node: | |
2245 mem = MergeMemNode::make(phase->C, mem); | |
2246 return mem; // fold me away | |
2247 } | |
2248 } | |
2249 } | |
2250 | |
2251 return NULL; // No further progress | |
2252 } | |
2253 | |
2254 //------------------------------Value----------------------------------------- | |
2255 const Type *StoreNode::Value( PhaseTransform *phase ) const { | |
2256 // Either input is TOP ==> the result is TOP | |
2257 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2258 if( t1 == Type::TOP ) return Type::TOP; | |
2259 const Type *t2 = phase->type( in(MemNode::Address) ); | |
2260 if( t2 == Type::TOP ) return Type::TOP; | |
2261 const Type *t3 = phase->type( in(MemNode::ValueIn) ); | |
2262 if( t3 == Type::TOP ) return Type::TOP; | |
2263 return Type::MEMORY; | |
2264 } | |
2265 | |
2266 //------------------------------Identity--------------------------------------- | |
2267 // Remove redundant stores: | |
2268 // Store(m, p, Load(m, p)) changes to m. | |
2269 // Store(, p, x) -> Store(m, p, x) changes to Store(m, p, x). | |
2270 Node *StoreNode::Identity( PhaseTransform *phase ) { | |
2271 Node* mem = in(MemNode::Memory); | |
2272 Node* adr = in(MemNode::Address); | |
2273 Node* val = in(MemNode::ValueIn); | |
2274 | |
2275 // Load then Store? Then the Store is useless | |
2276 if (val->is_Load() && | |
4778 | 2277 val->in(MemNode::Address)->eqv_uncast(adr) && |
2278 val->in(MemNode::Memory )->eqv_uncast(mem) && | |
0 | 2279 val->as_Load()->store_Opcode() == Opcode()) { |
2280 return mem; | |
2281 } | |
2282 | |
2283 // Two stores in a row of the same value? | |
2284 if (mem->is_Store() && | |
4778 | 2285 mem->in(MemNode::Address)->eqv_uncast(adr) && |
2286 mem->in(MemNode::ValueIn)->eqv_uncast(val) && | |
0 | 2287 mem->Opcode() == Opcode()) { |
2288 return mem; | |
2289 } | |
2290 | |
2291 // Store of zero anywhere into a freshly-allocated object? | |
2292 // Then the store is useless. | |
2293 // (It must already have been captured by the InitializeNode.) | |
2294 if (ReduceFieldZeroing && phase->type(val)->is_zero_type()) { | |
2295 // a newly allocated object is already all-zeroes everywhere | |
2296 if (mem->is_Proj() && mem->in(0)->is_Allocate()) { | |
2297 return mem; | |
2298 } | |
2299 | |
2300 // the store may also apply to zero-bits in an earlier object | |
2301 Node* prev_mem = find_previous_store(phase); | |
2302 // Steps (a), (b): Walk past independent stores to find an exact match. | |
2303 if (prev_mem != NULL) { | |
2304 Node* prev_val = can_see_stored_value(prev_mem, phase); | |
2305 if (prev_val != NULL && phase->eqv(prev_val, val)) { | |
2306 // prev_val and val might differ by a cast; it would be good | |
2307 // to keep the more informative of the two. | |
2308 return mem; | |
2309 } | |
2310 } | |
2311 } | |
2312 | |
2313 return this; | |
2314 } | |
2315 | |
2316 //------------------------------match_edge------------------------------------- | |
2317 // Do we Match on this edge index or not? Match only memory & value | |
2318 uint StoreNode::match_edge(uint idx) const { | |
2319 return idx == MemNode::Address || idx == MemNode::ValueIn; | |
2320 } | |
2321 | |
2322 //------------------------------cmp-------------------------------------------- | |
2323 // Do not common stores up together. They generally have to be split | |
2324 // back up anyways, so do not bother. | |
2325 uint StoreNode::cmp( const Node &n ) const { | |
2326 return (&n == this); // Always fail except on self | |
2327 } | |
2328 | |
2329 //------------------------------Ideal_masked_input----------------------------- | |
2330 // Check for a useless mask before a partial-word store | |
2331 // (StoreB ... (AndI valIn conIa) ) | |
2332 // If (conIa & mask == mask) this simplifies to | |
2333 // (StoreB ... (valIn) ) | |
2334 Node *StoreNode::Ideal_masked_input(PhaseGVN *phase, uint mask) { | |
2335 Node *val = in(MemNode::ValueIn); | |
2336 if( val->Opcode() == Op_AndI ) { | |
2337 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2338 if( t && t->is_con() && (t->get_con() & mask) == mask ) { | |
2339 set_req(MemNode::ValueIn, val->in(1)); | |
2340 return this; | |
2341 } | |
2342 } | |
2343 return NULL; | |
2344 } | |
2345 | |
2346 | |
2347 //------------------------------Ideal_sign_extended_input---------------------- | |
2348 // Check for useless sign-extension before a partial-word store | |
2349 // (StoreB ... (RShiftI _ (LShiftI _ valIn conIL ) conIR) ) | |
2350 // If (conIL == conIR && conIR <= num_bits) this simplifies to | |
2351 // (StoreB ... (valIn) ) | |
2352 Node *StoreNode::Ideal_sign_extended_input(PhaseGVN *phase, int num_bits) { | |
2353 Node *val = in(MemNode::ValueIn); | |
2354 if( val->Opcode() == Op_RShiftI ) { | |
2355 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2356 if( t && t->is_con() && (t->get_con() <= num_bits) ) { | |
2357 Node *shl = val->in(1); | |
2358 if( shl->Opcode() == Op_LShiftI ) { | |
2359 const TypeInt *t2 = phase->type( shl->in(2) )->isa_int(); | |
2360 if( t2 && t2->is_con() && (t2->get_con() == t->get_con()) ) { | |
2361 set_req(MemNode::ValueIn, shl->in(1)); | |
2362 return this; | |
2363 } | |
2364 } | |
2365 } | |
2366 } | |
2367 return NULL; | |
2368 } | |
2369 | |
2370 //------------------------------value_never_loaded----------------------------------- | |
2371 // Determine whether there are any possible loads of the value stored. | |
2372 // For simplicity, we actually check if there are any loads from the | |
2373 // address stored to, not just for loads of the value stored by this node. | |
2374 // | |
2375 bool StoreNode::value_never_loaded( PhaseTransform *phase) const { | |
2376 Node *adr = in(Address); | |
2377 const TypeOopPtr *adr_oop = phase->type(adr)->isa_oopptr(); | |
2378 if (adr_oop == NULL) | |
2379 return false; | |
223 | 2380 if (!adr_oop->is_known_instance_field()) |
0 | 2381 return false; // if not a distinct instance, there may be aliases of the address |
2382 for (DUIterator_Fast imax, i = adr->fast_outs(imax); i < imax; i++) { | |
2383 Node *use = adr->fast_out(i); | |
2384 int opc = use->Opcode(); | |
2385 if (use->is_Load() || use->is_LoadStore()) { | |
2386 return false; | |
2387 } | |
2388 } | |
2389 return true; | |
2390 } | |
2391 | |
2392 //============================================================================= | |
2393 //------------------------------Ideal------------------------------------------ | |
2394 // If the store is from an AND mask that leaves the low bits untouched, then | |
2395 // we can skip the AND operation. If the store is from a sign-extension | |
2396 // (a left shift, then right shift) we can skip both. | |
2397 Node *StoreBNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2398 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFF); | |
2399 if( progress != NULL ) return progress; | |
2400 | |
2401 progress = StoreNode::Ideal_sign_extended_input(phase, 24); | |
2402 if( progress != NULL ) return progress; | |
2403 | |
2404 // Finally check the default case | |
2405 return StoreNode::Ideal(phase, can_reshape); | |
2406 } | |
2407 | |
2408 //============================================================================= | |
2409 //------------------------------Ideal------------------------------------------ | |
2410 // If the store is from an AND mask that leaves the low bits untouched, then | |
2411 // we can skip the AND operation | |
2412 Node *StoreCNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2413 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFFFF); | |
2414 if( progress != NULL ) return progress; | |
2415 | |
2416 progress = StoreNode::Ideal_sign_extended_input(phase, 16); | |
2417 if( progress != NULL ) return progress; | |
2418 | |
2419 // Finally check the default case | |
2420 return StoreNode::Ideal(phase, can_reshape); | |
2421 } | |
2422 | |
2423 //============================================================================= | |
2424 //------------------------------Identity--------------------------------------- | |
2425 Node *StoreCMNode::Identity( PhaseTransform *phase ) { | |
2426 // No need to card mark when storing a null ptr | |
2427 Node* my_store = in(MemNode::OopStore); | |
2428 if (my_store->is_Store()) { | |
2429 const Type *t1 = phase->type( my_store->in(MemNode::ValueIn) ); | |
2430 if( t1 == TypePtr::NULL_PTR ) { | |
2431 return in(MemNode::Memory); | |
2432 } | |
2433 } | |
2434 return this; | |
2435 } | |
2436 | |
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2437 //============================================================================= |
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2438 //------------------------------Ideal--------------------------------------- |
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2439 Node *StoreCMNode::Ideal(PhaseGVN *phase, bool can_reshape){ |
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2440 Node* progress = StoreNode::Ideal(phase, can_reshape); |
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2441 if (progress != NULL) return progress; |
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2442 |
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2443 Node* my_store = in(MemNode::OopStore); |
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2444 if (my_store->is_MergeMem()) { |
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2445 Node* mem = my_store->as_MergeMem()->memory_at(oop_alias_idx()); |
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2446 set_req(MemNode::OopStore, mem); |
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2447 return this; |
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|
2448 } |
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|
2449 |
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2450 return NULL; |
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|
2451 } |
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2452 |
0 | 2453 //------------------------------Value----------------------------------------- |
2454 const Type *StoreCMNode::Value( PhaseTransform *phase ) const { | |
43 | 2455 // Either input is TOP ==> the result is TOP |
2456 const Type *t = phase->type( in(MemNode::Memory) ); | |
2457 if( t == Type::TOP ) return Type::TOP; | |
2458 t = phase->type( in(MemNode::Address) ); | |
2459 if( t == Type::TOP ) return Type::TOP; | |
2460 t = phase->type( in(MemNode::ValueIn) ); | |
2461 if( t == Type::TOP ) return Type::TOP; | |
0 | 2462 // If extra input is TOP ==> the result is TOP |
43 | 2463 t = phase->type( in(MemNode::OopStore) ); |
2464 if( t == Type::TOP ) return Type::TOP; | |
0 | 2465 |
2466 return StoreNode::Value( phase ); | |
2467 } | |
2468 | |
2469 | |
2470 //============================================================================= | |
2471 //----------------------------------SCMemProjNode------------------------------ | |
2472 const Type * SCMemProjNode::Value( PhaseTransform *phase ) const | |
2473 { | |
2474 return bottom_type(); | |
2475 } | |
2476 | |
2477 //============================================================================= | |
2478 LoadStoreNode::LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex ) : Node(5) { | |
2479 init_req(MemNode::Control, c ); | |
2480 init_req(MemNode::Memory , mem); | |
2481 init_req(MemNode::Address, adr); | |
2482 init_req(MemNode::ValueIn, val); | |
2483 init_req( ExpectedIn, ex ); | |
2484 init_class_id(Class_LoadStore); | |
2485 | |
2486 } | |
2487 | |
2488 //============================================================================= | |
2489 //-------------------------------adr_type-------------------------------------- | |
2490 // Do we Match on this edge index or not? Do not match memory | |
2491 const TypePtr* ClearArrayNode::adr_type() const { | |
2492 Node *adr = in(3); | |
2493 return MemNode::calculate_adr_type(adr->bottom_type()); | |
2494 } | |
2495 | |
2496 //------------------------------match_edge------------------------------------- | |
2497 // Do we Match on this edge index or not? Do not match memory | |
2498 uint ClearArrayNode::match_edge(uint idx) const { | |
2499 return idx > 1; | |
2500 } | |
2501 | |
2502 //------------------------------Identity--------------------------------------- | |
2503 // Clearing a zero length array does nothing | |
2504 Node *ClearArrayNode::Identity( PhaseTransform *phase ) { | |
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2505 return phase->type(in(2))->higher_equal(TypeX::ZERO) ? in(1) : this; |
0 | 2506 } |
2507 | |
2508 //------------------------------Idealize--------------------------------------- | |
2509 // Clearing a short array is faster with stores | |
2510 Node *ClearArrayNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2511 const int unit = BytesPerLong; | |
2512 const TypeX* t = phase->type(in(2))->isa_intptr_t(); | |
2513 if (!t) return NULL; | |
2514 if (!t->is_con()) return NULL; | |
2515 intptr_t raw_count = t->get_con(); | |
2516 intptr_t size = raw_count; | |
2517 if (!Matcher::init_array_count_is_in_bytes) size *= unit; | |
2518 // Clearing nothing uses the Identity call. | |
2519 // Negative clears are possible on dead ClearArrays | |
2520 // (see jck test stmt114.stmt11402.val). | |
2521 if (size <= 0 || size % unit != 0) return NULL; | |
2522 intptr_t count = size / unit; | |
2523 // Length too long; use fast hardware clear | |
2524 if (size > Matcher::init_array_short_size) return NULL; | |
2525 Node *mem = in(1); | |
2526 if( phase->type(mem)==Type::TOP ) return NULL; | |
2527 Node *adr = in(3); | |
2528 const Type* at = phase->type(adr); | |
2529 if( at==Type::TOP ) return NULL; | |
2530 const TypePtr* atp = at->isa_ptr(); | |
2531 // adjust atp to be the correct array element address type | |
2532 if (atp == NULL) atp = TypePtr::BOTTOM; | |
2533 else atp = atp->add_offset(Type::OffsetBot); | |
2534 // Get base for derived pointer purposes | |
2535 if( adr->Opcode() != Op_AddP ) Unimplemented(); | |
2536 Node *base = adr->in(1); | |
2537 | |
2538 Node *zero = phase->makecon(TypeLong::ZERO); | |
2539 Node *off = phase->MakeConX(BytesPerLong); | |
2540 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
2541 count--; | |
2542 while( count-- ) { | |
2543 mem = phase->transform(mem); | |
2544 adr = phase->transform(new (phase->C, 4) AddPNode(base,adr,off)); | |
2545 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
2546 } | |
2547 return mem; | |
2548 } | |
2549 | |
1100
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2550 //----------------------------step_through---------------------------------- |
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2551 // Return allocation input memory edge if it is different instance |
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2552 // or itself if it is the one we are looking for. |
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2553 bool ClearArrayNode::step_through(Node** np, uint instance_id, PhaseTransform* phase) { |
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2554 Node* n = *np; |
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2555 assert(n->is_ClearArray(), "sanity"); |
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2556 intptr_t offset; |
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2557 AllocateNode* alloc = AllocateNode::Ideal_allocation(n->in(3), phase, offset); |
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2558 // This method is called only before Allocate nodes are expanded during |
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2559 // macro nodes expansion. Before that ClearArray nodes are only generated |
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2560 // in LibraryCallKit::generate_arraycopy() which follows allocations. |
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2561 assert(alloc != NULL, "should have allocation"); |
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2562 if (alloc->_idx == instance_id) { |
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2563 // Can not bypass initialization of the instance we are looking for. |
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2564 return false; |
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|
2565 } |
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2566 // Otherwise skip it. |
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2567 InitializeNode* init = alloc->initialization(); |
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2568 if (init != NULL) |
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2569 *np = init->in(TypeFunc::Memory); |
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2570 else |
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2571 *np = alloc->in(TypeFunc::Memory); |
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2572 return true; |
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|
2573 } |
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2574 |
0 | 2575 //----------------------------clear_memory------------------------------------- |
2576 // Generate code to initialize object storage to zero. | |
2577 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2578 intptr_t start_offset, | |
2579 Node* end_offset, | |
2580 PhaseGVN* phase) { | |
2581 Compile* C = phase->C; | |
2582 intptr_t offset = start_offset; | |
2583 | |
2584 int unit = BytesPerLong; | |
2585 if ((offset % unit) != 0) { | |
2586 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(offset)); | |
2587 adr = phase->transform(adr); | |
2588 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2589 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
0 | 2590 mem = phase->transform(mem); |
2591 offset += BytesPerInt; | |
2592 } | |
2593 assert((offset % unit) == 0, ""); | |
2594 | |
2595 // Initialize the remaining stuff, if any, with a ClearArray. | |
2596 return clear_memory(ctl, mem, dest, phase->MakeConX(offset), end_offset, phase); | |
2597 } | |
2598 | |
2599 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2600 Node* start_offset, | |
2601 Node* end_offset, | |
2602 PhaseGVN* phase) { | |
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2603 if (start_offset == end_offset) { |
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|
2604 // nothing to do |
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|
2605 return mem; |
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|
2606 } |
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2607 |
0 | 2608 Compile* C = phase->C; |
2609 int unit = BytesPerLong; | |
2610 Node* zbase = start_offset; | |
2611 Node* zend = end_offset; | |
2612 | |
2613 // Scale to the unit required by the CPU: | |
2614 if (!Matcher::init_array_count_is_in_bytes) { | |
2615 Node* shift = phase->intcon(exact_log2(unit)); | |
2616 zbase = phase->transform( new(C,3) URShiftXNode(zbase, shift) ); | |
2617 zend = phase->transform( new(C,3) URShiftXNode(zend, shift) ); | |
2618 } | |
2619 | |
2620 Node* zsize = phase->transform( new(C,3) SubXNode(zend, zbase) ); | |
2621 Node* zinit = phase->zerocon((unit == BytesPerLong) ? T_LONG : T_INT); | |
2622 | |
2623 // Bulk clear double-words | |
2624 Node* adr = phase->transform( new(C,4) AddPNode(dest, dest, start_offset) ); | |
2625 mem = new (C, 4) ClearArrayNode(ctl, mem, zsize, adr); | |
2626 return phase->transform(mem); | |
2627 } | |
2628 | |
2629 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2630 intptr_t start_offset, | |
2631 intptr_t end_offset, | |
2632 PhaseGVN* phase) { | |
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2633 if (start_offset == end_offset) { |
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|
2634 // nothing to do |
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|
2635 return mem; |
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|
2636 } |
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|
2637 |
0 | 2638 Compile* C = phase->C; |
2639 assert((end_offset % BytesPerInt) == 0, "odd end offset"); | |
2640 intptr_t done_offset = end_offset; | |
2641 if ((done_offset % BytesPerLong) != 0) { | |
2642 done_offset -= BytesPerInt; | |
2643 } | |
2644 if (done_offset > start_offset) { | |
2645 mem = clear_memory(ctl, mem, dest, | |
2646 start_offset, phase->MakeConX(done_offset), phase); | |
2647 } | |
2648 if (done_offset < end_offset) { // emit the final 32-bit store | |
2649 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(done_offset)); | |
2650 adr = phase->transform(adr); | |
2651 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2652 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
0 | 2653 mem = phase->transform(mem); |
2654 done_offset += BytesPerInt; | |
2655 } | |
2656 assert(done_offset == end_offset, ""); | |
2657 return mem; | |
2658 } | |
2659 | |
2660 //============================================================================= | |
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2661 // Do not match memory edge. |
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2662 uint StrIntrinsicNode::match_edge(uint idx) const { |
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2663 return idx == 2 || idx == 3; |
681 | 2664 } |
2665 | |
2666 //------------------------------Ideal------------------------------------------ | |
2667 // Return a node which is more "ideal" than the current node. Strip out | |
2668 // control copies | |
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2669 Node *StrIntrinsicNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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2670 if (remove_dead_region(phase, can_reshape)) return this; |
4115 | 2671 // Don't bother trying to transform a dead node |
2672 if (in(0) && in(0)->is_top()) return NULL; | |
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2673 |
2417 | 2674 if (can_reshape) { |
2675 Node* mem = phase->transform(in(MemNode::Memory)); | |
2676 // If transformed to a MergeMem, get the desired slice | |
2677 uint alias_idx = phase->C->get_alias_index(adr_type()); | |
2678 mem = mem->is_MergeMem() ? mem->as_MergeMem()->memory_at(alias_idx) : mem; | |
2679 if (mem != in(MemNode::Memory)) { | |
2680 set_req(MemNode::Memory, mem); | |
2681 return this; | |
2682 } | |
2683 } | |
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2684 return NULL; |
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2685 } |
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2686 |
4115 | 2687 //------------------------------Value------------------------------------------ |
2688 const Type *StrIntrinsicNode::Value( PhaseTransform *phase ) const { | |
2689 if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP; | |
2690 return bottom_type(); | |
2691 } | |
2692 | |
0 | 2693 //============================================================================= |
2694 MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent) | |
2695 : MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)), | |
2696 _adr_type(C->get_adr_type(alias_idx)) | |
2697 { | |
2698 init_class_id(Class_MemBar); | |
2699 Node* top = C->top(); | |
2700 init_req(TypeFunc::I_O,top); | |
2701 init_req(TypeFunc::FramePtr,top); | |
2702 init_req(TypeFunc::ReturnAdr,top); | |
2703 if (precedent != NULL) | |
2704 init_req(TypeFunc::Parms, precedent); | |
2705 } | |
2706 | |
2707 //------------------------------cmp-------------------------------------------- | |
2708 uint MemBarNode::hash() const { return NO_HASH; } | |
2709 uint MemBarNode::cmp( const Node &n ) const { | |
2710 return (&n == this); // Always fail except on self | |
2711 } | |
2712 | |
2713 //------------------------------make------------------------------------------- | |
2714 MemBarNode* MemBarNode::make(Compile* C, int opcode, int atp, Node* pn) { | |
2715 int len = Precedent + (pn == NULL? 0: 1); | |
2716 switch (opcode) { | |
2717 case Op_MemBarAcquire: return new(C, len) MemBarAcquireNode(C, atp, pn); | |
2718 case Op_MemBarRelease: return new(C, len) MemBarReleaseNode(C, atp, pn); | |
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2719 case Op_MemBarAcquireLock: return new(C, len) MemBarAcquireLockNode(C, atp, pn); |
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2720 case Op_MemBarReleaseLock: return new(C, len) MemBarReleaseLockNode(C, atp, pn); |
0 | 2721 case Op_MemBarVolatile: return new(C, len) MemBarVolatileNode(C, atp, pn); |
2722 case Op_MemBarCPUOrder: return new(C, len) MemBarCPUOrderNode(C, atp, pn); | |
2723 case Op_Initialize: return new(C, len) InitializeNode(C, atp, pn); | |
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2724 case Op_MemBarStoreStore: return new(C, len) MemBarStoreStoreNode(C, atp, pn); |
0 | 2725 default: ShouldNotReachHere(); return NULL; |
2726 } | |
2727 } | |
2728 | |
2729 //------------------------------Ideal------------------------------------------ | |
2730 // Return a node which is more "ideal" than the current node. Strip out | |
2731 // control copies | |
2732 Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
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|
2733 if (remove_dead_region(phase, can_reshape)) return this; |
4115 | 2734 // Don't bother trying to transform a dead node |
2735 if (in(0) && in(0)->is_top()) return NULL; | |
1100
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|
2736 |
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|
2737 // Eliminate volatile MemBars for scalar replaced objects. |
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diff
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|
2738 if (can_reshape && req() == (Precedent+1) && |
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parents:
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diff
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|
2739 (Opcode() == Op_MemBarAcquire || Opcode() == Op_MemBarVolatile)) { |
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|
2740 // Volatile field loads and stores. |
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|
2741 Node* my_mem = in(MemBarNode::Precedent); |
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diff
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|
2742 if (my_mem != NULL && my_mem->is_Mem()) { |
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diff
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|
2743 const TypeOopPtr* t_oop = my_mem->in(MemNode::Address)->bottom_type()->isa_oopptr(); |
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|
2744 // Check for scalar replaced object reference. |
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|
2745 if( t_oop != NULL && t_oop->is_known_instance_field() && |
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kvn
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|
2746 t_oop->offset() != Type::OffsetBot && |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
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diff
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|
2747 t_oop->offset() != Type::OffsetTop) { |
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diff
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|
2748 // Replace MemBar projections by its inputs. |
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|
2749 PhaseIterGVN* igvn = phase->is_IterGVN(); |
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|
2750 igvn->replace_node(proj_out(TypeFunc::Memory), in(TypeFunc::Memory)); |
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6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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|
2751 igvn->replace_node(proj_out(TypeFunc::Control), in(TypeFunc::Control)); |
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6895383: JCK test throws NPE for method compiled with Escape Analysis
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|
2752 // Must return either the original node (now dead) or a new node |
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diff
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|
2753 // (Do not return a top here, since that would break the uniqueness of top.) |
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diff
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|
2754 return new (phase->C, 1) ConINode(TypeInt::ZERO); |
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|
2755 } |
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diff
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|
2756 } |
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diff
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|
2757 } |
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|
2758 return NULL; |
0 | 2759 } |
2760 | |
2761 //------------------------------Value------------------------------------------ | |
2762 const Type *MemBarNode::Value( PhaseTransform *phase ) const { | |
2763 if( !in(0) ) return Type::TOP; | |
2764 if( phase->type(in(0)) == Type::TOP ) | |
2765 return Type::TOP; | |
2766 return TypeTuple::MEMBAR; | |
2767 } | |
2768 | |
2769 //------------------------------match------------------------------------------ | |
2770 // Construct projections for memory. | |
2771 Node *MemBarNode::match( const ProjNode *proj, const Matcher *m ) { | |
2772 switch (proj->_con) { | |
2773 case TypeFunc::Control: | |
2774 case TypeFunc::Memory: | |
2775 return new (m->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); | |
2776 } | |
2777 ShouldNotReachHere(); | |
2778 return NULL; | |
2779 } | |
2780 | |
2781 //===========================InitializeNode==================================== | |
2782 // SUMMARY: | |
2783 // This node acts as a memory barrier on raw memory, after some raw stores. | |
2784 // The 'cooked' oop value feeds from the Initialize, not the Allocation. | |
2785 // The Initialize can 'capture' suitably constrained stores as raw inits. | |
2786 // It can coalesce related raw stores into larger units (called 'tiles'). | |
2787 // It can avoid zeroing new storage for memory units which have raw inits. | |
2788 // At macro-expansion, it is marked 'complete', and does not optimize further. | |
2789 // | |
2790 // EXAMPLE: | |
2791 // The object 'new short[2]' occupies 16 bytes in a 32-bit machine. | |
2792 // ctl = incoming control; mem* = incoming memory | |
2793 // (Note: A star * on a memory edge denotes I/O and other standard edges.) | |
2794 // First allocate uninitialized memory and fill in the header: | |
2795 // alloc = (Allocate ctl mem* 16 #short[].klass ...) | |
2796 // ctl := alloc.Control; mem* := alloc.Memory* | |
2797 // rawmem = alloc.Memory; rawoop = alloc.RawAddress | |
2798 // Then initialize to zero the non-header parts of the raw memory block: | |
2799 // init = (Initialize alloc.Control alloc.Memory* alloc.RawAddress) | |
2800 // ctl := init.Control; mem.SLICE(#short[*]) := init.Memory | |
2801 // After the initialize node executes, the object is ready for service: | |
2802 // oop := (CheckCastPP init.Control alloc.RawAddress #short[]) | |
2803 // Suppose its body is immediately initialized as {1,2}: | |
2804 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
2805 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
2806 // mem.SLICE(#short[*]) := store2 | |
2807 // | |
2808 // DETAILS: | |
2809 // An InitializeNode collects and isolates object initialization after | |
2810 // an AllocateNode and before the next possible safepoint. As a | |
2811 // memory barrier (MemBarNode), it keeps critical stores from drifting | |
2812 // down past any safepoint or any publication of the allocation. | |
2813 // Before this barrier, a newly-allocated object may have uninitialized bits. | |
2814 // After this barrier, it may be treated as a real oop, and GC is allowed. | |
2815 // | |
2816 // The semantics of the InitializeNode include an implicit zeroing of | |
2817 // the new object from object header to the end of the object. | |
2818 // (The object header and end are determined by the AllocateNode.) | |
2819 // | |
2820 // Certain stores may be added as direct inputs to the InitializeNode. | |
2821 // These stores must update raw memory, and they must be to addresses | |
2822 // derived from the raw address produced by AllocateNode, and with | |
2823 // a constant offset. They must be ordered by increasing offset. | |
2824 // The first one is at in(RawStores), the last at in(req()-1). | |
2825 // Unlike most memory operations, they are not linked in a chain, | |
2826 // but are displayed in parallel as users of the rawmem output of | |
2827 // the allocation. | |
2828 // | |
2829 // (See comments in InitializeNode::capture_store, which continue | |
2830 // the example given above.) | |
2831 // | |
2832 // When the associated Allocate is macro-expanded, the InitializeNode | |
2833 // may be rewritten to optimize collected stores. A ClearArrayNode | |
2834 // may also be created at that point to represent any required zeroing. | |
2835 // The InitializeNode is then marked 'complete', prohibiting further | |
2836 // capturing of nearby memory operations. | |
2837 // | |
2838 // During macro-expansion, all captured initializations which store | |
605 | 2839 // constant values of 32 bits or smaller are coalesced (if advantageous) |
0 | 2840 // into larger 'tiles' 32 or 64 bits. This allows an object to be |
2841 // initialized in fewer memory operations. Memory words which are | |
2842 // covered by neither tiles nor non-constant stores are pre-zeroed | |
2843 // by explicit stores of zero. (The code shape happens to do all | |
2844 // zeroing first, then all other stores, with both sequences occurring | |
2845 // in order of ascending offsets.) | |
2846 // | |
2847 // Alternatively, code may be inserted between an AllocateNode and its | |
2848 // InitializeNode, to perform arbitrary initialization of the new object. | |
2849 // E.g., the object copying intrinsics insert complex data transfers here. | |
2850 // The initialization must then be marked as 'complete' disable the | |
2851 // built-in zeroing semantics and the collection of initializing stores. | |
2852 // | |
2853 // While an InitializeNode is incomplete, reads from the memory state | |
2854 // produced by it are optimizable if they match the control edge and | |
2855 // new oop address associated with the allocation/initialization. | |
2856 // They return a stored value (if the offset matches) or else zero. | |
2857 // A write to the memory state, if it matches control and address, | |
2858 // and if it is to a constant offset, may be 'captured' by the | |
2859 // InitializeNode. It is cloned as a raw memory operation and rewired | |
2860 // inside the initialization, to the raw oop produced by the allocation. | |
2861 // Operations on addresses which are provably distinct (e.g., to | |
2862 // other AllocateNodes) are allowed to bypass the initialization. | |
2863 // | |
2864 // The effect of all this is to consolidate object initialization | |
2865 // (both arrays and non-arrays, both piecewise and bulk) into a | |
2866 // single location, where it can be optimized as a unit. | |
2867 // | |
2868 // Only stores with an offset less than TrackedInitializationLimit words | |
2869 // will be considered for capture by an InitializeNode. This puts a | |
2870 // reasonable limit on the complexity of optimized initializations. | |
2871 | |
2872 //---------------------------InitializeNode------------------------------------ | |
2873 InitializeNode::InitializeNode(Compile* C, int adr_type, Node* rawoop) | |
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2874 : _is_complete(Incomplete), _does_not_escape(false), |
0 | 2875 MemBarNode(C, adr_type, rawoop) |
2876 { | |
2877 init_class_id(Class_Initialize); | |
2878 | |
2879 assert(adr_type == Compile::AliasIdxRaw, "only valid atp"); | |
2880 assert(in(RawAddress) == rawoop, "proper init"); | |
2881 // Note: allocation() can be NULL, for secondary initialization barriers | |
2882 } | |
2883 | |
2884 // Since this node is not matched, it will be processed by the | |
2885 // register allocator. Declare that there are no constraints | |
2886 // on the allocation of the RawAddress edge. | |
2887 const RegMask &InitializeNode::in_RegMask(uint idx) const { | |
2888 // This edge should be set to top, by the set_complete. But be conservative. | |
2889 if (idx == InitializeNode::RawAddress) | |
2890 return *(Compile::current()->matcher()->idealreg2spillmask[in(idx)->ideal_reg()]); | |
2891 return RegMask::Empty; | |
2892 } | |
2893 | |
2894 Node* InitializeNode::memory(uint alias_idx) { | |
2895 Node* mem = in(Memory); | |
2896 if (mem->is_MergeMem()) { | |
2897 return mem->as_MergeMem()->memory_at(alias_idx); | |
2898 } else { | |
2899 // incoming raw memory is not split | |
2900 return mem; | |
2901 } | |
2902 } | |
2903 | |
2904 bool InitializeNode::is_non_zero() { | |
2905 if (is_complete()) return false; | |
2906 remove_extra_zeroes(); | |
2907 return (req() > RawStores); | |
2908 } | |
2909 | |
2910 void InitializeNode::set_complete(PhaseGVN* phase) { | |
2911 assert(!is_complete(), "caller responsibility"); | |
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2912 _is_complete = Complete; |
0 | 2913 |
2914 // After this node is complete, it contains a bunch of | |
2915 // raw-memory initializations. There is no need for | |
2916 // it to have anything to do with non-raw memory effects. | |
2917 // Therefore, tell all non-raw users to re-optimize themselves, | |
2918 // after skipping the memory effects of this initialization. | |
2919 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
2920 if (igvn) igvn->add_users_to_worklist(this); | |
2921 } | |
2922 | |
2923 // convenience function | |
2924 // return false if the init contains any stores already | |
2925 bool AllocateNode::maybe_set_complete(PhaseGVN* phase) { | |
2926 InitializeNode* init = initialization(); | |
2927 if (init == NULL || init->is_complete()) return false; | |
2928 init->remove_extra_zeroes(); | |
2929 // for now, if this allocation has already collected any inits, bail: | |
2930 if (init->is_non_zero()) return false; | |
2931 init->set_complete(phase); | |
2932 return true; | |
2933 } | |
2934 | |
2935 void InitializeNode::remove_extra_zeroes() { | |
2936 if (req() == RawStores) return; | |
2937 Node* zmem = zero_memory(); | |
2938 uint fill = RawStores; | |
2939 for (uint i = fill; i < req(); i++) { | |
2940 Node* n = in(i); | |
2941 if (n->is_top() || n == zmem) continue; // skip | |
2942 if (fill < i) set_req(fill, n); // compact | |
2943 ++fill; | |
2944 } | |
2945 // delete any empty spaces created: | |
2946 while (fill < req()) { | |
2947 del_req(fill); | |
2948 } | |
2949 } | |
2950 | |
2951 // Helper for remembering which stores go with which offsets. | |
2952 intptr_t InitializeNode::get_store_offset(Node* st, PhaseTransform* phase) { | |
2953 if (!st->is_Store()) return -1; // can happen to dead code via subsume_node | |
2954 intptr_t offset = -1; | |
2955 Node* base = AddPNode::Ideal_base_and_offset(st->in(MemNode::Address), | |
2956 phase, offset); | |
2957 if (base == NULL) return -1; // something is dead, | |
2958 if (offset < 0) return -1; // dead, dead | |
2959 return offset; | |
2960 } | |
2961 | |
2962 // Helper for proving that an initialization expression is | |
2963 // "simple enough" to be folded into an object initialization. | |
2964 // Attempts to prove that a store's initial value 'n' can be captured | |
2965 // within the initialization without creating a vicious cycle, such as: | |
2966 // { Foo p = new Foo(); p.next = p; } | |
2967 // True for constants and parameters and small combinations thereof. | |
2968 bool InitializeNode::detect_init_independence(Node* n, | |
2969 bool st_is_pinned, | |
2970 int& count) { | |
2971 if (n == NULL) return true; // (can this really happen?) | |
2972 if (n->is_Proj()) n = n->in(0); | |
2973 if (n == this) return false; // found a cycle | |
2974 if (n->is_Con()) return true; | |
2975 if (n->is_Start()) return true; // params, etc., are OK | |
2976 if (n->is_Root()) return true; // even better | |
2977 | |
2978 Node* ctl = n->in(0); | |
2979 if (ctl != NULL && !ctl->is_top()) { | |
2980 if (ctl->is_Proj()) ctl = ctl->in(0); | |
2981 if (ctl == this) return false; | |
2982 | |
2983 // If we already know that the enclosing memory op is pinned right after | |
2984 // the init, then any control flow that the store has picked up | |
2985 // must have preceded the init, or else be equal to the init. | |
2986 // Even after loop optimizations (which might change control edges) | |
2987 // a store is never pinned *before* the availability of its inputs. | |
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2988 if (!MemNode::all_controls_dominate(n, this)) |
0 | 2989 return false; // failed to prove a good control |
2990 | |
2991 } | |
2992 | |
2993 // Check data edges for possible dependencies on 'this'. | |
2994 if ((count += 1) > 20) return false; // complexity limit | |
2995 for (uint i = 1; i < n->req(); i++) { | |
2996 Node* m = n->in(i); | |
2997 if (m == NULL || m == n || m->is_top()) continue; | |
2998 uint first_i = n->find_edge(m); | |
2999 if (i != first_i) continue; // process duplicate edge just once | |
3000 if (!detect_init_independence(m, st_is_pinned, count)) { | |
3001 return false; | |
3002 } | |
3003 } | |
3004 | |
3005 return true; | |
3006 } | |
3007 | |
3008 // Here are all the checks a Store must pass before it can be moved into | |
3009 // an initialization. Returns zero if a check fails. | |
3010 // On success, returns the (constant) offset to which the store applies, | |
3011 // within the initialized memory. | |
3012 intptr_t InitializeNode::can_capture_store(StoreNode* st, PhaseTransform* phase) { | |
3013 const int FAIL = 0; | |
3014 if (st->req() != MemNode::ValueIn + 1) | |
3015 return FAIL; // an inscrutable StoreNode (card mark?) | |
3016 Node* ctl = st->in(MemNode::Control); | |
3017 if (!(ctl != NULL && ctl->is_Proj() && ctl->in(0) == this)) | |
3018 return FAIL; // must be unconditional after the initialization | |
3019 Node* mem = st->in(MemNode::Memory); | |
3020 if (!(mem->is_Proj() && mem->in(0) == this)) | |
3021 return FAIL; // must not be preceded by other stores | |
3022 Node* adr = st->in(MemNode::Address); | |
3023 intptr_t offset; | |
3024 AllocateNode* alloc = AllocateNode::Ideal_allocation(adr, phase, offset); | |
3025 if (alloc == NULL) | |
3026 return FAIL; // inscrutable address | |
3027 if (alloc != allocation()) | |
3028 return FAIL; // wrong allocation! (store needs to float up) | |
3029 Node* val = st->in(MemNode::ValueIn); | |
3030 int complexity_count = 0; | |
3031 if (!detect_init_independence(val, true, complexity_count)) | |
3032 return FAIL; // stored value must be 'simple enough' | |
3033 | |
3034 return offset; // success | |
3035 } | |
3036 | |
3037 // Find the captured store in(i) which corresponds to the range | |
3038 // [start..start+size) in the initialized object. | |
3039 // If there is one, return its index i. If there isn't, return the | |
3040 // negative of the index where it should be inserted. | |
3041 // Return 0 if the queried range overlaps an initialization boundary | |
3042 // or if dead code is encountered. | |
3043 // If size_in_bytes is zero, do not bother with overlap checks. | |
3044 int InitializeNode::captured_store_insertion_point(intptr_t start, | |
3045 int size_in_bytes, | |
3046 PhaseTransform* phase) { | |
3047 const int FAIL = 0, MAX_STORE = BytesPerLong; | |
3048 | |
3049 if (is_complete()) | |
3050 return FAIL; // arraycopy got here first; punt | |
3051 | |
3052 assert(allocation() != NULL, "must be present"); | |
3053 | |
3054 // no negatives, no header fields: | |
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3055 if (start < (intptr_t) allocation()->minimum_header_size()) return FAIL; |
0 | 3056 |
3057 // after a certain size, we bail out on tracking all the stores: | |
3058 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
3059 if (start >= ti_limit) return FAIL; | |
3060 | |
3061 for (uint i = InitializeNode::RawStores, limit = req(); ; ) { | |
3062 if (i >= limit) return -(int)i; // not found; here is where to put it | |
3063 | |
3064 Node* st = in(i); | |
3065 intptr_t st_off = get_store_offset(st, phase); | |
3066 if (st_off < 0) { | |
3067 if (st != zero_memory()) { | |
3068 return FAIL; // bail out if there is dead garbage | |
3069 } | |
3070 } else if (st_off > start) { | |
3071 // ...we are done, since stores are ordered | |
3072 if (st_off < start + size_in_bytes) { | |
3073 return FAIL; // the next store overlaps | |
3074 } | |
3075 return -(int)i; // not found; here is where to put it | |
3076 } else if (st_off < start) { | |
3077 if (size_in_bytes != 0 && | |
3078 start < st_off + MAX_STORE && | |
3079 start < st_off + st->as_Store()->memory_size()) { | |
3080 return FAIL; // the previous store overlaps | |
3081 } | |
3082 } else { | |
3083 if (size_in_bytes != 0 && | |
3084 st->as_Store()->memory_size() != size_in_bytes) { | |
3085 return FAIL; // mismatched store size | |
3086 } | |
3087 return i; | |
3088 } | |
3089 | |
3090 ++i; | |
3091 } | |
3092 } | |
3093 | |
3094 // Look for a captured store which initializes at the offset 'start' | |
3095 // with the given size. If there is no such store, and no other | |
3096 // initialization interferes, then return zero_memory (the memory | |
3097 // projection of the AllocateNode). | |
3098 Node* InitializeNode::find_captured_store(intptr_t start, int size_in_bytes, | |
3099 PhaseTransform* phase) { | |
3100 assert(stores_are_sane(phase), ""); | |
3101 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
3102 if (i == 0) { | |
3103 return NULL; // something is dead | |
3104 } else if (i < 0) { | |
3105 return zero_memory(); // just primordial zero bits here | |
3106 } else { | |
3107 Node* st = in(i); // here is the store at this position | |
3108 assert(get_store_offset(st->as_Store(), phase) == start, "sanity"); | |
3109 return st; | |
3110 } | |
3111 } | |
3112 | |
3113 // Create, as a raw pointer, an address within my new object at 'offset'. | |
3114 Node* InitializeNode::make_raw_address(intptr_t offset, | |
3115 PhaseTransform* phase) { | |
3116 Node* addr = in(RawAddress); | |
3117 if (offset != 0) { | |
3118 Compile* C = phase->C; | |
3119 addr = phase->transform( new (C, 4) AddPNode(C->top(), addr, | |
3120 phase->MakeConX(offset)) ); | |
3121 } | |
3122 return addr; | |
3123 } | |
3124 | |
3125 // Clone the given store, converting it into a raw store | |
3126 // initializing a field or element of my new object. | |
3127 // Caller is responsible for retiring the original store, | |
3128 // with subsume_node or the like. | |
3129 // | |
3130 // From the example above InitializeNode::InitializeNode, | |
3131 // here are the old stores to be captured: | |
3132 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
3133 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
3134 // | |
3135 // Here is the changed code; note the extra edges on init: | |
3136 // alloc = (Allocate ...) | |
3137 // rawoop = alloc.RawAddress | |
3138 // rawstore1 = (StoreC alloc.Control alloc.Memory (+ rawoop 12) 1) | |
3139 // rawstore2 = (StoreC alloc.Control alloc.Memory (+ rawoop 14) 2) | |
3140 // init = (Initialize alloc.Control alloc.Memory rawoop | |
3141 // rawstore1 rawstore2) | |
3142 // | |
3143 Node* InitializeNode::capture_store(StoreNode* st, intptr_t start, | |
3144 PhaseTransform* phase) { | |
3145 assert(stores_are_sane(phase), ""); | |
3146 | |
3147 if (start < 0) return NULL; | |
3148 assert(can_capture_store(st, phase) == start, "sanity"); | |
3149 | |
3150 Compile* C = phase->C; | |
3151 int size_in_bytes = st->memory_size(); | |
3152 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
3153 if (i == 0) return NULL; // bail out | |
3154 Node* prev_mem = NULL; // raw memory for the captured store | |
3155 if (i > 0) { | |
3156 prev_mem = in(i); // there is a pre-existing store under this one | |
3157 set_req(i, C->top()); // temporarily disconnect it | |
3158 // See StoreNode::Ideal 'st->outcnt() == 1' for the reason to disconnect. | |
3159 } else { | |
3160 i = -i; // no pre-existing store | |
3161 prev_mem = zero_memory(); // a slice of the newly allocated object | |
3162 if (i > InitializeNode::RawStores && in(i-1) == prev_mem) | |
3163 set_req(--i, C->top()); // reuse this edge; it has been folded away | |
3164 else | |
3165 ins_req(i, C->top()); // build a new edge | |
3166 } | |
3167 Node* new_st = st->clone(); | |
3168 new_st->set_req(MemNode::Control, in(Control)); | |
3169 new_st->set_req(MemNode::Memory, prev_mem); | |
3170 new_st->set_req(MemNode::Address, make_raw_address(start, phase)); | |
3171 new_st = phase->transform(new_st); | |
3172 | |
3173 // At this point, new_st might have swallowed a pre-existing store | |
3174 // at the same offset, or perhaps new_st might have disappeared, | |
3175 // if it redundantly stored the same value (or zero to fresh memory). | |
3176 | |
3177 // In any case, wire it in: | |
3178 set_req(i, new_st); | |
3179 | |
3180 // The caller may now kill the old guy. | |
3181 DEBUG_ONLY(Node* check_st = find_captured_store(start, size_in_bytes, phase)); | |
3182 assert(check_st == new_st || check_st == NULL, "must be findable"); | |
3183 assert(!is_complete(), ""); | |
3184 return new_st; | |
3185 } | |
3186 | |
3187 static bool store_constant(jlong* tiles, int num_tiles, | |
3188 intptr_t st_off, int st_size, | |
3189 jlong con) { | |
3190 if ((st_off & (st_size-1)) != 0) | |
3191 return false; // strange store offset (assume size==2**N) | |
3192 address addr = (address)tiles + st_off; | |
3193 assert(st_off >= 0 && addr+st_size <= (address)&tiles[num_tiles], "oob"); | |
3194 switch (st_size) { | |
3195 case sizeof(jbyte): *(jbyte*) addr = (jbyte) con; break; | |
3196 case sizeof(jchar): *(jchar*) addr = (jchar) con; break; | |
3197 case sizeof(jint): *(jint*) addr = (jint) con; break; | |
3198 case sizeof(jlong): *(jlong*) addr = (jlong) con; break; | |
3199 default: return false; // strange store size (detect size!=2**N here) | |
3200 } | |
3201 return true; // return success to caller | |
3202 } | |
3203 | |
3204 // Coalesce subword constants into int constants and possibly | |
3205 // into long constants. The goal, if the CPU permits, | |
3206 // is to initialize the object with a small number of 64-bit tiles. | |
3207 // Also, convert floating-point constants to bit patterns. | |
3208 // Non-constants are not relevant to this pass. | |
3209 // | |
3210 // In terms of the running example on InitializeNode::InitializeNode | |
3211 // and InitializeNode::capture_store, here is the transformation | |
3212 // of rawstore1 and rawstore2 into rawstore12: | |
3213 // alloc = (Allocate ...) | |
3214 // rawoop = alloc.RawAddress | |
3215 // tile12 = 0x00010002 | |
3216 // rawstore12 = (StoreI alloc.Control alloc.Memory (+ rawoop 12) tile12) | |
3217 // init = (Initialize alloc.Control alloc.Memory rawoop rawstore12) | |
3218 // | |
3219 void | |
3220 InitializeNode::coalesce_subword_stores(intptr_t header_size, | |
3221 Node* size_in_bytes, | |
3222 PhaseGVN* phase) { | |
3223 Compile* C = phase->C; | |
3224 | |
3225 assert(stores_are_sane(phase), ""); | |
3226 // Note: After this pass, they are not completely sane, | |
3227 // since there may be some overlaps. | |
3228 | |
3229 int old_subword = 0, old_long = 0, new_int = 0, new_long = 0; | |
3230 | |
3231 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
3232 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, ti_limit); | |
3233 size_limit = MIN2(size_limit, ti_limit); | |
3234 size_limit = align_size_up(size_limit, BytesPerLong); | |
3235 int num_tiles = size_limit / BytesPerLong; | |
3236 | |
3237 // allocate space for the tile map: | |
3238 const int small_len = DEBUG_ONLY(true ? 3 :) 30; // keep stack frames small | |
3239 jlong tiles_buf[small_len]; | |
3240 Node* nodes_buf[small_len]; | |
3241 jlong inits_buf[small_len]; | |
3242 jlong* tiles = ((num_tiles <= small_len) ? &tiles_buf[0] | |
3243 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
3244 Node** nodes = ((num_tiles <= small_len) ? &nodes_buf[0] | |
3245 : NEW_RESOURCE_ARRAY(Node*, num_tiles)); | |
3246 jlong* inits = ((num_tiles <= small_len) ? &inits_buf[0] | |
3247 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
3248 // tiles: exact bitwise model of all primitive constants | |
3249 // nodes: last constant-storing node subsumed into the tiles model | |
3250 // inits: which bytes (in each tile) are touched by any initializations | |
3251 | |
3252 //// Pass A: Fill in the tile model with any relevant stores. | |
3253 | |
3254 Copy::zero_to_bytes(tiles, sizeof(tiles[0]) * num_tiles); | |
3255 Copy::zero_to_bytes(nodes, sizeof(nodes[0]) * num_tiles); | |
3256 Copy::zero_to_bytes(inits, sizeof(inits[0]) * num_tiles); | |
3257 Node* zmem = zero_memory(); // initially zero memory state | |
3258 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3259 Node* st = in(i); | |
3260 intptr_t st_off = get_store_offset(st, phase); | |
3261 | |
3262 // Figure out the store's offset and constant value: | |
3263 if (st_off < header_size) continue; //skip (ignore header) | |
3264 if (st->in(MemNode::Memory) != zmem) continue; //skip (odd store chain) | |
3265 int st_size = st->as_Store()->memory_size(); | |
3266 if (st_off + st_size > size_limit) break; | |
3267 | |
3268 // Record which bytes are touched, whether by constant or not. | |
3269 if (!store_constant(inits, num_tiles, st_off, st_size, (jlong) -1)) | |
3270 continue; // skip (strange store size) | |
3271 | |
3272 const Type* val = phase->type(st->in(MemNode::ValueIn)); | |
3273 if (!val->singleton()) continue; //skip (non-con store) | |
3274 BasicType type = val->basic_type(); | |
3275 | |
3276 jlong con = 0; | |
3277 switch (type) { | |
3278 case T_INT: con = val->is_int()->get_con(); break; | |
3279 case T_LONG: con = val->is_long()->get_con(); break; | |
3280 case T_FLOAT: con = jint_cast(val->getf()); break; | |
3281 case T_DOUBLE: con = jlong_cast(val->getd()); break; | |
3282 default: continue; //skip (odd store type) | |
3283 } | |
3284 | |
3285 if (type == T_LONG && Matcher::isSimpleConstant64(con) && | |
3286 st->Opcode() == Op_StoreL) { | |
3287 continue; // This StoreL is already optimal. | |
3288 } | |
3289 | |
3290 // Store down the constant. | |
3291 store_constant(tiles, num_tiles, st_off, st_size, con); | |
3292 | |
3293 intptr_t j = st_off >> LogBytesPerLong; | |
3294 | |
3295 if (type == T_INT && st_size == BytesPerInt | |
3296 && (st_off & BytesPerInt) == BytesPerInt) { | |
3297 jlong lcon = tiles[j]; | |
3298 if (!Matcher::isSimpleConstant64(lcon) && | |
3299 st->Opcode() == Op_StoreI) { | |
3300 // This StoreI is already optimal by itself. | |
3301 jint* intcon = (jint*) &tiles[j]; | |
3302 intcon[1] = 0; // undo the store_constant() | |
3303 | |
3304 // If the previous store is also optimal by itself, back up and | |
3305 // undo the action of the previous loop iteration... if we can. | |
3306 // But if we can't, just let the previous half take care of itself. | |
3307 st = nodes[j]; | |
3308 st_off -= BytesPerInt; | |
3309 con = intcon[0]; | |
3310 if (con != 0 && st != NULL && st->Opcode() == Op_StoreI) { | |
3311 assert(st_off >= header_size, "still ignoring header"); | |
3312 assert(get_store_offset(st, phase) == st_off, "must be"); | |
3313 assert(in(i-1) == zmem, "must be"); | |
3314 DEBUG_ONLY(const Type* tcon = phase->type(st->in(MemNode::ValueIn))); | |
3315 assert(con == tcon->is_int()->get_con(), "must be"); | |
3316 // Undo the effects of the previous loop trip, which swallowed st: | |
3317 intcon[0] = 0; // undo store_constant() | |
3318 set_req(i-1, st); // undo set_req(i, zmem) | |
3319 nodes[j] = NULL; // undo nodes[j] = st | |
3320 --old_subword; // undo ++old_subword | |
3321 } | |
3322 continue; // This StoreI is already optimal. | |
3323 } | |
3324 } | |
3325 | |
3326 // This store is not needed. | |
3327 set_req(i, zmem); | |
3328 nodes[j] = st; // record for the moment | |
3329 if (st_size < BytesPerLong) // something has changed | |
3330 ++old_subword; // includes int/float, but who's counting... | |
3331 else ++old_long; | |
3332 } | |
3333 | |
3334 if ((old_subword + old_long) == 0) | |
3335 return; // nothing more to do | |
3336 | |
3337 //// Pass B: Convert any non-zero tiles into optimal constant stores. | |
3338 // Be sure to insert them before overlapping non-constant stores. | |
3339 // (E.g., byte[] x = { 1,2,y,4 } => x[int 0] = 0x01020004, x[2]=y.) | |
3340 for (int j = 0; j < num_tiles; j++) { | |
3341 jlong con = tiles[j]; | |
3342 jlong init = inits[j]; | |
3343 if (con == 0) continue; | |
3344 jint con0, con1; // split the constant, address-wise | |
3345 jint init0, init1; // split the init map, address-wise | |
3346 { union { jlong con; jint intcon[2]; } u; | |
3347 u.con = con; | |
3348 con0 = u.intcon[0]; | |
3349 con1 = u.intcon[1]; | |
3350 u.con = init; | |
3351 init0 = u.intcon[0]; | |
3352 init1 = u.intcon[1]; | |
3353 } | |
3354 | |
3355 Node* old = nodes[j]; | |
3356 assert(old != NULL, "need the prior store"); | |
3357 intptr_t offset = (j * BytesPerLong); | |
3358 | |
3359 bool split = !Matcher::isSimpleConstant64(con); | |
3360 | |
3361 if (offset < header_size) { | |
3362 assert(offset + BytesPerInt >= header_size, "second int counts"); | |
3363 assert(*(jint*)&tiles[j] == 0, "junk in header"); | |
3364 split = true; // only the second word counts | |
3365 // Example: int a[] = { 42 ... } | |
3366 } else if (con0 == 0 && init0 == -1) { | |
3367 split = true; // first word is covered by full inits | |
3368 // Example: int a[] = { ... foo(), 42 ... } | |
3369 } else if (con1 == 0 && init1 == -1) { | |
3370 split = true; // second word is covered by full inits | |
3371 // Example: int a[] = { ... 42, foo() ... } | |
3372 } | |
3373 | |
3374 // Here's a case where init0 is neither 0 nor -1: | |
3375 // byte a[] = { ... 0,0,foo(),0, 0,0,0,42 ... } | |
3376 // Assuming big-endian memory, init0, init1 are 0x0000FF00, 0x000000FF. | |
3377 // In this case the tile is not split; it is (jlong)42. | |
3378 // The big tile is stored down, and then the foo() value is inserted. | |
3379 // (If there were foo(),foo() instead of foo(),0, init0 would be -1.) | |
3380 | |
3381 Node* ctl = old->in(MemNode::Control); | |
3382 Node* adr = make_raw_address(offset, phase); | |
3383 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
3384 | |
3385 // One or two coalesced stores to plop down. | |
3386 Node* st[2]; | |
3387 intptr_t off[2]; | |
3388 int nst = 0; | |
3389 if (!split) { | |
3390 ++new_long; | |
3391 off[nst] = offset; | |
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3392 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3393 phase->longcon(con), T_LONG); |
3394 } else { | |
3395 // Omit either if it is a zero. | |
3396 if (con0 != 0) { | |
3397 ++new_int; | |
3398 off[nst] = offset; | |
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3399 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3400 phase->intcon(con0), T_INT); |
3401 } | |
3402 if (con1 != 0) { | |
3403 ++new_int; | |
3404 offset += BytesPerInt; | |
3405 adr = make_raw_address(offset, phase); | |
3406 off[nst] = offset; | |
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3407 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3408 phase->intcon(con1), T_INT); |
3409 } | |
3410 } | |
3411 | |
3412 // Insert second store first, then the first before the second. | |
3413 // Insert each one just before any overlapping non-constant stores. | |
3414 while (nst > 0) { | |
3415 Node* st1 = st[--nst]; | |
3416 C->copy_node_notes_to(st1, old); | |
3417 st1 = phase->transform(st1); | |
3418 offset = off[nst]; | |
3419 assert(offset >= header_size, "do not smash header"); | |
3420 int ins_idx = captured_store_insertion_point(offset, /*size:*/0, phase); | |
3421 guarantee(ins_idx != 0, "must re-insert constant store"); | |
3422 if (ins_idx < 0) ins_idx = -ins_idx; // never overlap | |
3423 if (ins_idx > InitializeNode::RawStores && in(ins_idx-1) == zmem) | |
3424 set_req(--ins_idx, st1); | |
3425 else | |
3426 ins_req(ins_idx, st1); | |
3427 } | |
3428 } | |
3429 | |
3430 if (PrintCompilation && WizardMode) | |
3431 tty->print_cr("Changed %d/%d subword/long constants into %d/%d int/long", | |
3432 old_subword, old_long, new_int, new_long); | |
3433 if (C->log() != NULL) | |
3434 C->log()->elem("comment that='%d/%d subword/long to %d/%d int/long'", | |
3435 old_subword, old_long, new_int, new_long); | |
3436 | |
3437 // Clean up any remaining occurrences of zmem: | |
3438 remove_extra_zeroes(); | |
3439 } | |
3440 | |
3441 // Explore forward from in(start) to find the first fully initialized | |
3442 // word, and return its offset. Skip groups of subword stores which | |
3443 // together initialize full words. If in(start) is itself part of a | |
3444 // fully initialized word, return the offset of in(start). If there | |
3445 // are no following full-word stores, or if something is fishy, return | |
3446 // a negative value. | |
3447 intptr_t InitializeNode::find_next_fullword_store(uint start, PhaseGVN* phase) { | |
3448 int int_map = 0; | |
3449 intptr_t int_map_off = 0; | |
3450 const int FULL_MAP = right_n_bits(BytesPerInt); // the int_map we hope for | |
3451 | |
3452 for (uint i = start, limit = req(); i < limit; i++) { | |
3453 Node* st = in(i); | |
3454 | |
3455 intptr_t st_off = get_store_offset(st, phase); | |
3456 if (st_off < 0) break; // return conservative answer | |
3457 | |
3458 int st_size = st->as_Store()->memory_size(); | |
3459 if (st_size >= BytesPerInt && (st_off % BytesPerInt) == 0) { | |
3460 return st_off; // we found a complete word init | |
3461 } | |
3462 | |
3463 // update the map: | |
3464 | |
3465 intptr_t this_int_off = align_size_down(st_off, BytesPerInt); | |
3466 if (this_int_off != int_map_off) { | |
3467 // reset the map: | |
3468 int_map = 0; | |
3469 int_map_off = this_int_off; | |
3470 } | |
3471 | |
3472 int subword_off = st_off - this_int_off; | |
3473 int_map |= right_n_bits(st_size) << subword_off; | |
3474 if ((int_map & FULL_MAP) == FULL_MAP) { | |
3475 return this_int_off; // we found a complete word init | |
3476 } | |
3477 | |
3478 // Did this store hit or cross the word boundary? | |
3479 intptr_t next_int_off = align_size_down(st_off + st_size, BytesPerInt); | |
3480 if (next_int_off == this_int_off + BytesPerInt) { | |
3481 // We passed the current int, without fully initializing it. | |
3482 int_map_off = next_int_off; | |
3483 int_map >>= BytesPerInt; | |
3484 } else if (next_int_off > this_int_off + BytesPerInt) { | |
3485 // We passed the current and next int. | |
3486 return this_int_off + BytesPerInt; | |
3487 } | |
3488 } | |
3489 | |
3490 return -1; | |
3491 } | |
3492 | |
3493 | |
3494 // Called when the associated AllocateNode is expanded into CFG. | |
3495 // At this point, we may perform additional optimizations. | |
3496 // Linearize the stores by ascending offset, to make memory | |
3497 // activity as coherent as possible. | |
3498 Node* InitializeNode::complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
3499 intptr_t header_size, | |
3500 Node* size_in_bytes, | |
3501 PhaseGVN* phase) { | |
3502 assert(!is_complete(), "not already complete"); | |
3503 assert(stores_are_sane(phase), ""); | |
3504 assert(allocation() != NULL, "must be present"); | |
3505 | |
3506 remove_extra_zeroes(); | |
3507 | |
3508 if (ReduceFieldZeroing || ReduceBulkZeroing) | |
3509 // reduce instruction count for common initialization patterns | |
3510 coalesce_subword_stores(header_size, size_in_bytes, phase); | |
3511 | |
3512 Node* zmem = zero_memory(); // initially zero memory state | |
3513 Node* inits = zmem; // accumulating a linearized chain of inits | |
3514 #ifdef ASSERT | |
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3515 intptr_t first_offset = allocation()->minimum_header_size(); |
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3516 intptr_t last_init_off = first_offset; // previous init offset |
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3517 intptr_t last_init_end = first_offset; // previous init offset+size |
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3518 intptr_t last_tile_end = first_offset; // previous tile offset+size |
0 | 3519 #endif |
3520 intptr_t zeroes_done = header_size; | |
3521 | |
3522 bool do_zeroing = true; // we might give up if inits are very sparse | |
3523 int big_init_gaps = 0; // how many large gaps have we seen? | |
3524 | |
3525 if (ZeroTLAB) do_zeroing = false; | |
3526 if (!ReduceFieldZeroing && !ReduceBulkZeroing) do_zeroing = false; | |
3527 | |
3528 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3529 Node* st = in(i); | |
3530 intptr_t st_off = get_store_offset(st, phase); | |
3531 if (st_off < 0) | |
3532 break; // unknown junk in the inits | |
3533 if (st->in(MemNode::Memory) != zmem) | |
3534 break; // complicated store chains somehow in list | |
3535 | |
3536 int st_size = st->as_Store()->memory_size(); | |
3537 intptr_t next_init_off = st_off + st_size; | |
3538 | |
3539 if (do_zeroing && zeroes_done < next_init_off) { | |
3540 // See if this store needs a zero before it or under it. | |
3541 intptr_t zeroes_needed = st_off; | |
3542 | |
3543 if (st_size < BytesPerInt) { | |
3544 // Look for subword stores which only partially initialize words. | |
3545 // If we find some, we must lay down some word-level zeroes first, | |
3546 // underneath the subword stores. | |
3547 // | |
3548 // Examples: | |
3549 // byte[] a = { p,q,r,s } => a[0]=p,a[1]=q,a[2]=r,a[3]=s | |
3550 // byte[] a = { x,y,0,0 } => a[0..3] = 0, a[0]=x,a[1]=y | |
3551 // byte[] a = { 0,0,z,0 } => a[0..3] = 0, a[2]=z | |
3552 // | |
3553 // Note: coalesce_subword_stores may have already done this, | |
3554 // if it was prompted by constant non-zero subword initializers. | |
3555 // But this case can still arise with non-constant stores. | |
3556 | |
3557 intptr_t next_full_store = find_next_fullword_store(i, phase); | |
3558 | |
3559 // In the examples above: | |
3560 // in(i) p q r s x y z | |
3561 // st_off 12 13 14 15 12 13 14 | |
3562 // st_size 1 1 1 1 1 1 1 | |
3563 // next_full_s. 12 16 16 16 16 16 16 | |
3564 // z's_done 12 16 16 16 12 16 12 | |
3565 // z's_needed 12 16 16 16 16 16 16 | |
3566 // zsize 0 0 0 0 4 0 4 | |
3567 if (next_full_store < 0) { | |
3568 // Conservative tack: Zero to end of current word. | |
3569 zeroes_needed = align_size_up(zeroes_needed, BytesPerInt); | |
3570 } else { | |
3571 // Zero to beginning of next fully initialized word. | |
3572 // Or, don't zero at all, if we are already in that word. | |
3573 assert(next_full_store >= zeroes_needed, "must go forward"); | |
3574 assert((next_full_store & (BytesPerInt-1)) == 0, "even boundary"); | |
3575 zeroes_needed = next_full_store; | |
3576 } | |
3577 } | |
3578 | |
3579 if (zeroes_needed > zeroes_done) { | |
3580 intptr_t zsize = zeroes_needed - zeroes_done; | |
3581 // Do some incremental zeroing on rawmem, in parallel with inits. | |
3582 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3583 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3584 zeroes_done, zeroes_needed, | |
3585 phase); | |
3586 zeroes_done = zeroes_needed; | |
3587 if (zsize > Matcher::init_array_short_size && ++big_init_gaps > 2) | |
3588 do_zeroing = false; // leave the hole, next time | |
3589 } | |
3590 } | |
3591 | |
3592 // Collect the store and move on: | |
3593 st->set_req(MemNode::Memory, inits); | |
3594 inits = st; // put it on the linearized chain | |
3595 set_req(i, zmem); // unhook from previous position | |
3596 | |
3597 if (zeroes_done == st_off) | |
3598 zeroes_done = next_init_off; | |
3599 | |
3600 assert(!do_zeroing || zeroes_done >= next_init_off, "don't miss any"); | |
3601 | |
3602 #ifdef ASSERT | |
3603 // Various order invariants. Weaker than stores_are_sane because | |
3604 // a large constant tile can be filled in by smaller non-constant stores. | |
3605 assert(st_off >= last_init_off, "inits do not reverse"); | |
3606 last_init_off = st_off; | |
3607 const Type* val = NULL; | |
3608 if (st_size >= BytesPerInt && | |
3609 (val = phase->type(st->in(MemNode::ValueIn)))->singleton() && | |
3610 (int)val->basic_type() < (int)T_OBJECT) { | |
3611 assert(st_off >= last_tile_end, "tiles do not overlap"); | |
3612 assert(st_off >= last_init_end, "tiles do not overwrite inits"); | |
3613 last_tile_end = MAX2(last_tile_end, next_init_off); | |
3614 } else { | |
3615 intptr_t st_tile_end = align_size_up(next_init_off, BytesPerLong); | |
3616 assert(st_tile_end >= last_tile_end, "inits stay with tiles"); | |
3617 assert(st_off >= last_init_end, "inits do not overlap"); | |
3618 last_init_end = next_init_off; // it's a non-tile | |
3619 } | |
3620 #endif //ASSERT | |
3621 } | |
3622 | |
3623 remove_extra_zeroes(); // clear out all the zmems left over | |
3624 add_req(inits); | |
3625 | |
3626 if (!ZeroTLAB) { | |
3627 // If anything remains to be zeroed, zero it all now. | |
3628 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3629 // if it is the last unused 4 bytes of an instance, forget about it | |
3630 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint); | |
3631 if (zeroes_done + BytesPerLong >= size_limit) { | |
3632 assert(allocation() != NULL, ""); | |
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3633 if (allocation()->Opcode() == Op_Allocate) { |
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3634 Node* klass_node = allocation()->in(AllocateNode::KlassNode); |
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3635 ciKlass* k = phase->type(klass_node)->is_klassptr()->klass(); |
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3636 if (zeroes_done == k->layout_helper()) |
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3637 zeroes_done = size_limit; |
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3638 } |
0 | 3639 } |
3640 if (zeroes_done < size_limit) { | |
3641 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3642 zeroes_done, size_in_bytes, phase); | |
3643 } | |
3644 } | |
3645 | |
3646 set_complete(phase); | |
3647 return rawmem; | |
3648 } | |
3649 | |
3650 | |
3651 #ifdef ASSERT | |
3652 bool InitializeNode::stores_are_sane(PhaseTransform* phase) { | |
3653 if (is_complete()) | |
3654 return true; // stores could be anything at this point | |
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3655 assert(allocation() != NULL, "must be present"); |
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3656 intptr_t last_off = allocation()->minimum_header_size(); |
0 | 3657 for (uint i = InitializeNode::RawStores; i < req(); i++) { |
3658 Node* st = in(i); | |
3659 intptr_t st_off = get_store_offset(st, phase); | |
3660 if (st_off < 0) continue; // ignore dead garbage | |
3661 if (last_off > st_off) { | |
3662 tty->print_cr("*** bad store offset at %d: %d > %d", i, last_off, st_off); | |
3663 this->dump(2); | |
3664 assert(false, "ascending store offsets"); | |
3665 return false; | |
3666 } | |
3667 last_off = st_off + st->as_Store()->memory_size(); | |
3668 } | |
3669 return true; | |
3670 } | |
3671 #endif //ASSERT | |
3672 | |
3673 | |
3674 | |
3675 | |
3676 //============================MergeMemNode===================================== | |
3677 // | |
3678 // SEMANTICS OF MEMORY MERGES: A MergeMem is a memory state assembled from several | |
3679 // contributing store or call operations. Each contributor provides the memory | |
3680 // state for a particular "alias type" (see Compile::alias_type). For example, | |
3681 // if a MergeMem has an input X for alias category #6, then any memory reference | |
3682 // to alias category #6 may use X as its memory state input, as an exact equivalent | |
3683 // to using the MergeMem as a whole. | |
3684 // Load<6>( MergeMem(<6>: X, ...), p ) <==> Load<6>(X,p) | |
3685 // | |
3686 // (Here, the <N> notation gives the index of the relevant adr_type.) | |
3687 // | |
3688 // In one special case (and more cases in the future), alias categories overlap. | |
3689 // The special alias category "Bot" (Compile::AliasIdxBot) includes all memory | |
3690 // states. Therefore, if a MergeMem has only one contributing input W for Bot, | |
3691 // it is exactly equivalent to that state W: | |
3692 // MergeMem(<Bot>: W) <==> W | |
3693 // | |
3694 // Usually, the merge has more than one input. In that case, where inputs | |
3695 // overlap (i.e., one is Bot), the narrower alias type determines the memory | |
3696 // state for that type, and the wider alias type (Bot) fills in everywhere else: | |
3697 // Load<5>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<5>(W,p) | |
3698 // Load<6>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<6>(X,p) | |
3699 // | |
3700 // A merge can take a "wide" memory state as one of its narrow inputs. | |
3701 // This simply means that the merge observes out only the relevant parts of | |
3702 // the wide input. That is, wide memory states arriving at narrow merge inputs | |
3703 // are implicitly "filtered" or "sliced" as necessary. (This is rare.) | |
3704 // | |
3705 // These rules imply that MergeMem nodes may cascade (via their <Bot> links), | |
3706 // and that memory slices "leak through": | |
3707 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y)) <==> MergeMem(<Bot>: W, <7>: Y) | |
3708 // | |
3709 // But, in such a cascade, repeated memory slices can "block the leak": | |
3710 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y), <7>: Y') <==> MergeMem(<Bot>: W, <7>: Y') | |
3711 // | |
3712 // In the last example, Y is not part of the combined memory state of the | |
3713 // outermost MergeMem. The system must, of course, prevent unschedulable | |
3714 // memory states from arising, so you can be sure that the state Y is somehow | |
3715 // a precursor to state Y'. | |
3716 // | |
3717 // | |
3718 // REPRESENTATION OF MEMORY MERGES: The indexes used to address the Node::in array | |
3719 // of each MergeMemNode array are exactly the numerical alias indexes, including | |
3720 // but not limited to AliasIdxTop, AliasIdxBot, and AliasIdxRaw. The functions | |
3721 // Compile::alias_type (and kin) produce and manage these indexes. | |
3722 // | |
3723 // By convention, the value of in(AliasIdxTop) (i.e., in(1)) is always the top node. | |
3724 // (Note that this provides quick access to the top node inside MergeMem methods, | |
3725 // without the need to reach out via TLS to Compile::current.) | |
3726 // | |
3727 // As a consequence of what was just described, a MergeMem that represents a full | |
3728 // memory state has an edge in(AliasIdxBot) which is a "wide" memory state, | |
3729 // containing all alias categories. | |
3730 // | |
3731 // MergeMem nodes never (?) have control inputs, so in(0) is NULL. | |
3732 // | |
3733 // All other edges in(N) (including in(AliasIdxRaw), which is in(3)) are either | |
3734 // a memory state for the alias type <N>, or else the top node, meaning that | |
3735 // there is no particular input for that alias type. Note that the length of | |
3736 // a MergeMem is variable, and may be extended at any time to accommodate new | |
3737 // memory states at larger alias indexes. When merges grow, they are of course | |
3738 // filled with "top" in the unused in() positions. | |
3739 // | |
3740 // This use of top is named "empty_memory()", or "empty_mem" (no-memory) as a variable. | |
3741 // (Top was chosen because it works smoothly with passes like GCM.) | |
3742 // | |
3743 // For convenience, we hardwire the alias index for TypeRawPtr::BOTTOM. (It is | |
3744 // the type of random VM bits like TLS references.) Since it is always the | |
3745 // first non-Bot memory slice, some low-level loops use it to initialize an | |
3746 // index variable: for (i = AliasIdxRaw; i < req(); i++). | |
3747 // | |
3748 // | |
3749 // ACCESSORS: There is a special accessor MergeMemNode::base_memory which returns | |
3750 // the distinguished "wide" state. The accessor MergeMemNode::memory_at(N) returns | |
3751 // the memory state for alias type <N>, or (if there is no particular slice at <N>, | |
3752 // it returns the base memory. To prevent bugs, memory_at does not accept <Top> | |
3753 // or <Bot> indexes. The iterator MergeMemStream provides robust iteration over | |
3754 // MergeMem nodes or pairs of such nodes, ensuring that the non-top edges are visited. | |
3755 // | |
3756 // %%%% We may get rid of base_memory as a separate accessor at some point; it isn't | |
3757 // really that different from the other memory inputs. An abbreviation called | |
3758 // "bot_memory()" for "memory_at(AliasIdxBot)" would keep code tidy. | |
3759 // | |
3760 // | |
3761 // PARTIAL MEMORY STATES: During optimization, MergeMem nodes may arise that represent | |
3762 // partial memory states. When a Phi splits through a MergeMem, the copy of the Phi | |
3763 // that "emerges though" the base memory will be marked as excluding the alias types | |
3764 // of the other (narrow-memory) copies which "emerged through" the narrow edges: | |
3765 // | |
3766 // Phi<Bot>(U, MergeMem(<Bot>: W, <8>: Y)) | |
3767 // ==Ideal=> MergeMem(<Bot>: Phi<Bot-8>(U, W), Phi<8>(U, Y)) | |
3768 // | |
3769 // This strange "subtraction" effect is necessary to ensure IGVN convergence. | |
3770 // (It is currently unimplemented.) As you can see, the resulting merge is | |
3771 // actually a disjoint union of memory states, rather than an overlay. | |
3772 // | |
3773 | |
3774 //------------------------------MergeMemNode----------------------------------- | |
3775 Node* MergeMemNode::make_empty_memory() { | |
3776 Node* empty_memory = (Node*) Compile::current()->top(); | |
3777 assert(empty_memory->is_top(), "correct sentinel identity"); | |
3778 return empty_memory; | |
3779 } | |
3780 | |
3781 MergeMemNode::MergeMemNode(Node *new_base) : Node(1+Compile::AliasIdxRaw) { | |
3782 init_class_id(Class_MergeMem); | |
3783 // all inputs are nullified in Node::Node(int) | |
3784 // set_input(0, NULL); // no control input | |
3785 | |
3786 // Initialize the edges uniformly to top, for starters. | |
3787 Node* empty_mem = make_empty_memory(); | |
3788 for (uint i = Compile::AliasIdxTop; i < req(); i++) { | |
3789 init_req(i,empty_mem); | |
3790 } | |
3791 assert(empty_memory() == empty_mem, ""); | |
3792 | |
3793 if( new_base != NULL && new_base->is_MergeMem() ) { | |
3794 MergeMemNode* mdef = new_base->as_MergeMem(); | |
3795 assert(mdef->empty_memory() == empty_mem, "consistent sentinels"); | |
3796 for (MergeMemStream mms(this, mdef); mms.next_non_empty2(); ) { | |
3797 mms.set_memory(mms.memory2()); | |
3798 } | |
3799 assert(base_memory() == mdef->base_memory(), ""); | |
3800 } else { | |
3801 set_base_memory(new_base); | |
3802 } | |
3803 } | |
3804 | |
3805 // Make a new, untransformed MergeMem with the same base as 'mem'. | |
3806 // If mem is itself a MergeMem, populate the result with the same edges. | |
3807 MergeMemNode* MergeMemNode::make(Compile* C, Node* mem) { | |
3808 return new(C, 1+Compile::AliasIdxRaw) MergeMemNode(mem); | |
3809 } | |
3810 | |
3811 //------------------------------cmp-------------------------------------------- | |
3812 uint MergeMemNode::hash() const { return NO_HASH; } | |
3813 uint MergeMemNode::cmp( const Node &n ) const { | |
3814 return (&n == this); // Always fail except on self | |
3815 } | |
3816 | |
3817 //------------------------------Identity--------------------------------------- | |
3818 Node* MergeMemNode::Identity(PhaseTransform *phase) { | |
3819 // Identity if this merge point does not record any interesting memory | |
3820 // disambiguations. | |
3821 Node* base_mem = base_memory(); | |
3822 Node* empty_mem = empty_memory(); | |
3823 if (base_mem != empty_mem) { // Memory path is not dead? | |
3824 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3825 Node* mem = in(i); | |
3826 if (mem != empty_mem && mem != base_mem) { | |
3827 return this; // Many memory splits; no change | |
3828 } | |
3829 } | |
3830 } | |
3831 return base_mem; // No memory splits; ID on the one true input | |
3832 } | |
3833 | |
3834 //------------------------------Ideal------------------------------------------ | |
3835 // This method is invoked recursively on chains of MergeMem nodes | |
3836 Node *MergeMemNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
3837 // Remove chain'd MergeMems | |
3838 // | |
3839 // This is delicate, because the each "in(i)" (i >= Raw) is interpreted | |
3840 // relative to the "in(Bot)". Since we are patching both at the same time, | |
3841 // we have to be careful to read each "in(i)" relative to the old "in(Bot)", | |
3842 // but rewrite each "in(i)" relative to the new "in(Bot)". | |
3843 Node *progress = NULL; | |
3844 | |
3845 | |
3846 Node* old_base = base_memory(); | |
3847 Node* empty_mem = empty_memory(); | |
3848 if (old_base == empty_mem) | |
3849 return NULL; // Dead memory path. | |
3850 | |
3851 MergeMemNode* old_mbase; | |
3852 if (old_base != NULL && old_base->is_MergeMem()) | |
3853 old_mbase = old_base->as_MergeMem(); | |
3854 else | |
3855 old_mbase = NULL; | |
3856 Node* new_base = old_base; | |
3857 | |
3858 // simplify stacked MergeMems in base memory | |
3859 if (old_mbase) new_base = old_mbase->base_memory(); | |
3860 | |
3861 // the base memory might contribute new slices beyond my req() | |
3862 if (old_mbase) grow_to_match(old_mbase); | |
3863 | |
3864 // Look carefully at the base node if it is a phi. | |
3865 PhiNode* phi_base; | |
3866 if (new_base != NULL && new_base->is_Phi()) | |
3867 phi_base = new_base->as_Phi(); | |
3868 else | |
3869 phi_base = NULL; | |
3870 | |
3871 Node* phi_reg = NULL; | |
3872 uint phi_len = (uint)-1; | |
3873 if (phi_base != NULL && !phi_base->is_copy()) { | |
3874 // do not examine phi if degraded to a copy | |
3875 phi_reg = phi_base->region(); | |
3876 phi_len = phi_base->req(); | |
3877 // see if the phi is unfinished | |
3878 for (uint i = 1; i < phi_len; i++) { | |
3879 if (phi_base->in(i) == NULL) { | |
3880 // incomplete phi; do not look at it yet! | |
3881 phi_reg = NULL; | |
3882 phi_len = (uint)-1; | |
3883 break; | |
3884 } | |
3885 } | |
3886 } | |
3887 | |
3888 // Note: We do not call verify_sparse on entry, because inputs | |
3889 // can normalize to the base_memory via subsume_node or similar | |
3890 // mechanisms. This method repairs that damage. | |
3891 | |
3892 assert(!old_mbase || old_mbase->is_empty_memory(empty_mem), "consistent sentinels"); | |
3893 | |
3894 // Look at each slice. | |
3895 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3896 Node* old_in = in(i); | |
3897 // calculate the old memory value | |
3898 Node* old_mem = old_in; | |
3899 if (old_mem == empty_mem) old_mem = old_base; | |
3900 assert(old_mem == memory_at(i), ""); | |
3901 | |
3902 // maybe update (reslice) the old memory value | |
3903 | |
3904 // simplify stacked MergeMems | |
3905 Node* new_mem = old_mem; | |
3906 MergeMemNode* old_mmem; | |
3907 if (old_mem != NULL && old_mem->is_MergeMem()) | |
3908 old_mmem = old_mem->as_MergeMem(); | |
3909 else | |
3910 old_mmem = NULL; | |
3911 if (old_mmem == this) { | |
3912 // This can happen if loops break up and safepoints disappear. | |
3913 // A merge of BotPtr (default) with a RawPtr memory derived from a | |
3914 // safepoint can be rewritten to a merge of the same BotPtr with | |
3915 // the BotPtr phi coming into the loop. If that phi disappears | |
3916 // also, we can end up with a self-loop of the mergemem. | |
3917 // In general, if loops degenerate and memory effects disappear, | |
3918 // a mergemem can be left looking at itself. This simply means | |
3919 // that the mergemem's default should be used, since there is | |
3920 // no longer any apparent effect on this slice. | |
3921 // Note: If a memory slice is a MergeMem cycle, it is unreachable | |
3922 // from start. Update the input to TOP. | |
3923 new_mem = (new_base == this || new_base == empty_mem)? empty_mem : new_base; | |
3924 } | |
3925 else if (old_mmem != NULL) { | |
3926 new_mem = old_mmem->memory_at(i); | |
3927 } | |
605 | 3928 // else preceding memory was not a MergeMem |
0 | 3929 |
3930 // replace equivalent phis (unfortunately, they do not GVN together) | |
3931 if (new_mem != NULL && new_mem != new_base && | |
3932 new_mem->req() == phi_len && new_mem->in(0) == phi_reg) { | |
3933 if (new_mem->is_Phi()) { | |
3934 PhiNode* phi_mem = new_mem->as_Phi(); | |
3935 for (uint i = 1; i < phi_len; i++) { | |
3936 if (phi_base->in(i) != phi_mem->in(i)) { | |
3937 phi_mem = NULL; | |
3938 break; | |
3939 } | |
3940 } | |
3941 if (phi_mem != NULL) { | |
3942 // equivalent phi nodes; revert to the def | |
3943 new_mem = new_base; | |
3944 } | |
3945 } | |
3946 } | |
3947 | |
3948 // maybe store down a new value | |
3949 Node* new_in = new_mem; | |
3950 if (new_in == new_base) new_in = empty_mem; | |
3951 | |
3952 if (new_in != old_in) { | |
3953 // Warning: Do not combine this "if" with the previous "if" | |
3954 // A memory slice might have be be rewritten even if it is semantically | |
3955 // unchanged, if the base_memory value has changed. | |
3956 set_req(i, new_in); | |
3957 progress = this; // Report progress | |
3958 } | |
3959 } | |
3960 | |
3961 if (new_base != old_base) { | |
3962 set_req(Compile::AliasIdxBot, new_base); | |
3963 // Don't use set_base_memory(new_base), because we need to update du. | |
3964 assert(base_memory() == new_base, ""); | |
3965 progress = this; | |
3966 } | |
3967 | |
3968 if( base_memory() == this ) { | |
3969 // a self cycle indicates this memory path is dead | |
3970 set_req(Compile::AliasIdxBot, empty_mem); | |
3971 } | |
3972 | |
3973 // Resolve external cycles by calling Ideal on a MergeMem base_memory | |
3974 // Recursion must occur after the self cycle check above | |
3975 if( base_memory()->is_MergeMem() ) { | |
3976 MergeMemNode *new_mbase = base_memory()->as_MergeMem(); | |
3977 Node *m = phase->transform(new_mbase); // Rollup any cycles | |
3978 if( m != NULL && (m->is_top() || | |
3979 m->is_MergeMem() && m->as_MergeMem()->base_memory() == empty_mem) ) { | |
3980 // propagate rollup of dead cycle to self | |
3981 set_req(Compile::AliasIdxBot, empty_mem); | |
3982 } | |
3983 } | |
3984 | |
3985 if( base_memory() == empty_mem ) { | |
3986 progress = this; | |
3987 // Cut inputs during Parse phase only. | |
3988 // During Optimize phase a dead MergeMem node will be subsumed by Top. | |
3989 if( !can_reshape ) { | |
3990 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3991 if( in(i) != empty_mem ) { set_req(i, empty_mem); } | |
3992 } | |
3993 } | |
3994 } | |
3995 | |
3996 if( !progress && base_memory()->is_Phi() && can_reshape ) { | |
3997 // Check if PhiNode::Ideal's "Split phis through memory merges" | |
3998 // transform should be attempted. Look for this->phi->this cycle. | |
3999 uint merge_width = req(); | |
4000 if (merge_width > Compile::AliasIdxRaw) { | |
4001 PhiNode* phi = base_memory()->as_Phi(); | |
4002 for( uint i = 1; i < phi->req(); ++i ) {// For all paths in | |
4003 if (phi->in(i) == this) { | |
4004 phase->is_IterGVN()->_worklist.push(phi); | |
4005 break; | |
4006 } | |
4007 } | |
4008 } | |
4009 } | |
4010 | |
64
b8f5ba577b02
6673473: (Escape Analysis) Add the instance's field information to PhiNode
kvn
parents:
43
diff
changeset
|
4011 assert(progress || verify_sparse(), "please, no dups of base"); |
0 | 4012 return progress; |
4013 } | |
4014 | |
4015 //-------------------------set_base_memory------------------------------------- | |
4016 void MergeMemNode::set_base_memory(Node *new_base) { | |
4017 Node* empty_mem = empty_memory(); | |
4018 set_req(Compile::AliasIdxBot, new_base); | |
4019 assert(memory_at(req()) == new_base, "must set default memory"); | |
4020 // Clear out other occurrences of new_base: | |
4021 if (new_base != empty_mem) { | |
4022 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4023 if (in(i) == new_base) set_req(i, empty_mem); | |
4024 } | |
4025 } | |
4026 } | |
4027 | |
4028 //------------------------------out_RegMask------------------------------------ | |
4029 const RegMask &MergeMemNode::out_RegMask() const { | |
4030 return RegMask::Empty; | |
4031 } | |
4032 | |
4033 //------------------------------dump_spec-------------------------------------- | |
4034 #ifndef PRODUCT | |
4035 void MergeMemNode::dump_spec(outputStream *st) const { | |
4036 st->print(" {"); | |
4037 Node* base_mem = base_memory(); | |
4038 for( uint i = Compile::AliasIdxRaw; i < req(); i++ ) { | |
4039 Node* mem = memory_at(i); | |
4040 if (mem == base_mem) { st->print(" -"); continue; } | |
4041 st->print( " N%d:", mem->_idx ); | |
4042 Compile::current()->get_adr_type(i)->dump_on(st); | |
4043 } | |
4044 st->print(" }"); | |
4045 } | |
4046 #endif // !PRODUCT | |
4047 | |
4048 | |
4049 #ifdef ASSERT | |
4050 static bool might_be_same(Node* a, Node* b) { | |
4051 if (a == b) return true; | |
4052 if (!(a->is_Phi() || b->is_Phi())) return false; | |
4053 // phis shift around during optimization | |
4054 return true; // pretty stupid... | |
4055 } | |
4056 | |
4057 // verify a narrow slice (either incoming or outgoing) | |
4058 static void verify_memory_slice(const MergeMemNode* m, int alias_idx, Node* n) { | |
4059 if (!VerifyAliases) return; // don't bother to verify unless requested | |
4060 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
4061 if (Node::in_dump()) return; // muzzle asserts when printing | |
4062 assert(alias_idx >= Compile::AliasIdxRaw, "must not disturb base_memory or sentinel"); | |
4063 assert(n != NULL, ""); | |
4064 // Elide intervening MergeMem's | |
4065 while (n->is_MergeMem()) { | |
4066 n = n->as_MergeMem()->memory_at(alias_idx); | |
4067 } | |
4068 Compile* C = Compile::current(); | |
4069 const TypePtr* n_adr_type = n->adr_type(); | |
4070 if (n == m->empty_memory()) { | |
4071 // Implicit copy of base_memory() | |
4072 } else if (n_adr_type != TypePtr::BOTTOM) { | |
4073 assert(n_adr_type != NULL, "new memory must have a well-defined adr_type"); | |
4074 assert(C->must_alias(n_adr_type, alias_idx), "new memory must match selected slice"); | |
4075 } else { | |
4076 // A few places like make_runtime_call "know" that VM calls are narrow, | |
4077 // and can be used to update only the VM bits stored as TypeRawPtr::BOTTOM. | |
4078 bool expected_wide_mem = false; | |
4079 if (n == m->base_memory()) { | |
4080 expected_wide_mem = true; | |
4081 } else if (alias_idx == Compile::AliasIdxRaw || | |
4082 n == m->memory_at(Compile::AliasIdxRaw)) { | |
4083 expected_wide_mem = true; | |
4084 } else if (!C->alias_type(alias_idx)->is_rewritable()) { | |
4085 // memory can "leak through" calls on channels that | |
4086 // are write-once. Allow this also. | |
4087 expected_wide_mem = true; | |
4088 } | |
4089 assert(expected_wide_mem, "expected narrow slice replacement"); | |
4090 } | |
4091 } | |
4092 #else // !ASSERT | |
4093 #define verify_memory_slice(m,i,n) (0) // PRODUCT version is no-op | |
4094 #endif | |
4095 | |
4096 | |
4097 //-----------------------------memory_at--------------------------------------- | |
4098 Node* MergeMemNode::memory_at(uint alias_idx) const { | |
4099 assert(alias_idx >= Compile::AliasIdxRaw || | |
4100 alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, | |
4101 "must avoid base_memory and AliasIdxTop"); | |
4102 | |
4103 // Otherwise, it is a narrow slice. | |
4104 Node* n = alias_idx < req() ? in(alias_idx) : empty_memory(); | |
4105 Compile *C = Compile::current(); | |
4106 if (is_empty_memory(n)) { | |
4107 // the array is sparse; empty slots are the "top" node | |
4108 n = base_memory(); | |
4109 assert(Node::in_dump() | |
4110 || n == NULL || n->bottom_type() == Type::TOP | |
2317
5a41a201d08c
6812217: Base memory of MergeMem node violates assert during killing expanded AllocateArray node
kvn
parents:
2004
diff
changeset
|
4111 || n->adr_type() == NULL // address is TOP |
0 | 4112 || n->adr_type() == TypePtr::BOTTOM |
4113 || n->adr_type() == TypeRawPtr::BOTTOM | |
4114 || Compile::current()->AliasLevel() == 0, | |
4115 "must be a wide memory"); | |
4116 // AliasLevel == 0 if we are organizing the memory states manually. | |
4117 // See verify_memory_slice for comments on TypeRawPtr::BOTTOM. | |
4118 } else { | |
4119 // make sure the stored slice is sane | |
4120 #ifdef ASSERT | |
4121 if (is_error_reported() || Node::in_dump()) { | |
4122 } else if (might_be_same(n, base_memory())) { | |
4123 // Give it a pass: It is a mostly harmless repetition of the base. | |
4124 // This can arise normally from node subsumption during optimization. | |
4125 } else { | |
4126 verify_memory_slice(this, alias_idx, n); | |
4127 } | |
4128 #endif | |
4129 } | |
4130 return n; | |
4131 } | |
4132 | |
4133 //---------------------------set_memory_at------------------------------------- | |
4134 void MergeMemNode::set_memory_at(uint alias_idx, Node *n) { | |
4135 verify_memory_slice(this, alias_idx, n); | |
4136 Node* empty_mem = empty_memory(); | |
4137 if (n == base_memory()) n = empty_mem; // collapse default | |
4138 uint need_req = alias_idx+1; | |
4139 if (req() < need_req) { | |
4140 if (n == empty_mem) return; // already the default, so do not grow me | |
4141 // grow the sparse array | |
4142 do { | |
4143 add_req(empty_mem); | |
4144 } while (req() < need_req); | |
4145 } | |
4146 set_req( alias_idx, n ); | |
4147 } | |
4148 | |
4149 | |
4150 | |
4151 //--------------------------iteration_setup------------------------------------ | |
4152 void MergeMemNode::iteration_setup(const MergeMemNode* other) { | |
4153 if (other != NULL) { | |
4154 grow_to_match(other); | |
4155 // invariant: the finite support of mm2 is within mm->req() | |
4156 #ifdef ASSERT | |
4157 for (uint i = req(); i < other->req(); i++) { | |
4158 assert(other->is_empty_memory(other->in(i)), "slice left uncovered"); | |
4159 } | |
4160 #endif | |
4161 } | |
4162 // Replace spurious copies of base_memory by top. | |
4163 Node* base_mem = base_memory(); | |
4164 if (base_mem != NULL && !base_mem->is_top()) { | |
4165 for (uint i = Compile::AliasIdxBot+1, imax = req(); i < imax; i++) { | |
4166 if (in(i) == base_mem) | |
4167 set_req(i, empty_memory()); | |
4168 } | |
4169 } | |
4170 } | |
4171 | |
4172 //---------------------------grow_to_match------------------------------------- | |
4173 void MergeMemNode::grow_to_match(const MergeMemNode* other) { | |
4174 Node* empty_mem = empty_memory(); | |
4175 assert(other->is_empty_memory(empty_mem), "consistent sentinels"); | |
4176 // look for the finite support of the other memory | |
4177 for (uint i = other->req(); --i >= req(); ) { | |
4178 if (other->in(i) != empty_mem) { | |
4179 uint new_len = i+1; | |
4180 while (req() < new_len) add_req(empty_mem); | |
4181 break; | |
4182 } | |
4183 } | |
4184 } | |
4185 | |
4186 //---------------------------verify_sparse------------------------------------- | |
4187 #ifndef PRODUCT | |
4188 bool MergeMemNode::verify_sparse() const { | |
4189 assert(is_empty_memory(make_empty_memory()), "sane sentinel"); | |
4190 Node* base_mem = base_memory(); | |
4191 // The following can happen in degenerate cases, since empty==top. | |
4192 if (is_empty_memory(base_mem)) return true; | |
4193 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4194 assert(in(i) != NULL, "sane slice"); | |
4195 if (in(i) == base_mem) return false; // should have been the sentinel value! | |
4196 } | |
4197 return true; | |
4198 } | |
4199 | |
4200 bool MergeMemStream::match_memory(Node* mem, const MergeMemNode* mm, int idx) { | |
4201 Node* n; | |
4202 n = mm->in(idx); | |
4203 if (mem == n) return true; // might be empty_memory() | |
4204 n = (idx == Compile::AliasIdxBot)? mm->base_memory(): mm->memory_at(idx); | |
4205 if (mem == n) return true; | |
4206 while (n->is_Phi() && (n = n->as_Phi()->is_copy()) != NULL) { | |
4207 if (mem == n) return true; | |
4208 if (n == NULL) break; | |
4209 } | |
4210 return false; | |
4211 } | |
4212 #endif // !PRODUCT |