Mercurial > hg > truffle
annotate src/share/vm/opto/memnode.cpp @ 1359:23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
Summary: Make sure that two marking cycles do not overlap, i.e., a new one can only start after the concurrent marking thread finishes all its work. In the fix I piggy-back a couple of minor extra fixes: some general code reformatting for consistency (only around the code I modified), the removal of a field (G1CollectorPolicy::_should_initiate_conc_mark) which doesn't seem to be used at all (it's only set but never read), as well as moving the "is GC locker active" test earlier into the G1 pause / Full GC and using a more appropriate method for it.
Reviewed-by: johnc, jmasa, jcoomes, ysr
author | tonyp |
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date | Tue, 06 Apr 2010 10:59:45 -0400 |
parents | f96a1a986f7b |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
624 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // Portions of code courtesy of Clifford Click | |
26 | |
27 // Optimization - Graph Style | |
28 | |
29 #include "incls/_precompiled.incl" | |
30 #include "incls/_memnode.cpp.incl" | |
31 | |
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32 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st); |
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33 |
0 | 34 //============================================================================= |
35 uint MemNode::size_of() const { return sizeof(*this); } | |
36 | |
37 const TypePtr *MemNode::adr_type() const { | |
38 Node* adr = in(Address); | |
39 const TypePtr* cross_check = NULL; | |
40 DEBUG_ONLY(cross_check = _adr_type); | |
41 return calculate_adr_type(adr->bottom_type(), cross_check); | |
42 } | |
43 | |
44 #ifndef PRODUCT | |
45 void MemNode::dump_spec(outputStream *st) const { | |
46 if (in(Address) == NULL) return; // node is dead | |
47 #ifndef ASSERT | |
48 // fake the missing field | |
49 const TypePtr* _adr_type = NULL; | |
50 if (in(Address) != NULL) | |
51 _adr_type = in(Address)->bottom_type()->isa_ptr(); | |
52 #endif | |
53 dump_adr_type(this, _adr_type, st); | |
54 | |
55 Compile* C = Compile::current(); | |
56 if( C->alias_type(_adr_type)->is_volatile() ) | |
57 st->print(" Volatile!"); | |
58 } | |
59 | |
60 void MemNode::dump_adr_type(const Node* mem, const TypePtr* adr_type, outputStream *st) { | |
61 st->print(" @"); | |
62 if (adr_type == NULL) { | |
63 st->print("NULL"); | |
64 } else { | |
65 adr_type->dump_on(st); | |
66 Compile* C = Compile::current(); | |
67 Compile::AliasType* atp = NULL; | |
68 if (C->have_alias_type(adr_type)) atp = C->alias_type(adr_type); | |
69 if (atp == NULL) | |
70 st->print(", idx=?\?;"); | |
71 else if (atp->index() == Compile::AliasIdxBot) | |
72 st->print(", idx=Bot;"); | |
73 else if (atp->index() == Compile::AliasIdxTop) | |
74 st->print(", idx=Top;"); | |
75 else if (atp->index() == Compile::AliasIdxRaw) | |
76 st->print(", idx=Raw;"); | |
77 else { | |
78 ciField* field = atp->field(); | |
79 if (field) { | |
80 st->print(", name="); | |
81 field->print_name_on(st); | |
82 } | |
83 st->print(", idx=%d;", atp->index()); | |
84 } | |
85 } | |
86 } | |
87 | |
88 extern void print_alias_types(); | |
89 | |
90 #endif | |
91 | |
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92 Node *MemNode::optimize_simple_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase) { |
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93 const TypeOopPtr *tinst = t_adr->isa_oopptr(); |
223 | 94 if (tinst == NULL || !tinst->is_known_instance_field()) |
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95 return mchain; // don't try to optimize non-instance types |
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96 uint instance_id = tinst->instance_id(); |
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97 Node *start_mem = phase->C->start()->proj_out(TypeFunc::Memory); |
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98 Node *prev = NULL; |
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99 Node *result = mchain; |
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100 while (prev != result) { |
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101 prev = result; |
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102 if (result == start_mem) |
605 | 103 break; // hit one of our sentinels |
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104 // skip over a call which does not affect this memory slice |
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105 if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) { |
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106 Node *proj_in = result->in(0); |
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107 if (proj_in->is_Allocate() && proj_in->_idx == instance_id) { |
605 | 108 break; // hit one of our sentinels |
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109 } else if (proj_in->is_Call()) { |
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110 CallNode *call = proj_in->as_Call(); |
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111 if (!call->may_modify(t_adr, phase)) { |
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112 result = call->in(TypeFunc::Memory); |
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113 } |
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114 } else if (proj_in->is_Initialize()) { |
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115 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); |
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116 // Stop if this is the initialization for the object instance which |
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117 // which contains this memory slice, otherwise skip over it. |
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118 if (alloc != NULL && alloc->_idx != instance_id) { |
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119 result = proj_in->in(TypeFunc::Memory); |
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120 } |
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121 } else if (proj_in->is_MemBar()) { |
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122 result = proj_in->in(TypeFunc::Memory); |
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123 } else { |
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124 assert(false, "unexpected projection"); |
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125 } |
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126 } else if (result->is_ClearArray()) { |
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127 if (!ClearArrayNode::step_through(&result, instance_id, phase)) { |
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128 // Can not bypass initialization of the instance |
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129 // we are looking for. |
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130 break; |
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131 } |
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132 // Otherwise skip it (the call updated 'result' value). |
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133 } else if (result->is_MergeMem()) { |
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134 result = step_through_mergemem(phase, result->as_MergeMem(), t_adr, NULL, tty); |
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135 } |
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136 } |
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137 return result; |
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138 } |
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139 |
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140 Node *MemNode::optimize_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase) { |
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141 const TypeOopPtr *t_oop = t_adr->isa_oopptr(); |
223 | 142 bool is_instance = (t_oop != NULL) && t_oop->is_known_instance_field(); |
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143 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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144 Node *result = mchain; |
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145 result = optimize_simple_memory_chain(result, t_adr, phase); |
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146 if (is_instance && igvn != NULL && result->is_Phi()) { |
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147 PhiNode *mphi = result->as_Phi(); |
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148 assert(mphi->bottom_type() == Type::MEMORY, "memory phi required"); |
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149 const TypePtr *t = mphi->adr_type(); |
163 | 150 if (t == TypePtr::BOTTOM || t == TypeRawPtr::BOTTOM || |
223 | 151 t->isa_oopptr() && !t->is_oopptr()->is_known_instance() && |
247 | 152 t->is_oopptr()->cast_to_exactness(true) |
153 ->is_oopptr()->cast_to_ptr_type(t_oop->ptr()) | |
154 ->is_oopptr()->cast_to_instance_id(t_oop->instance_id()) == t_oop) { | |
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155 // clone the Phi with our address type |
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156 result = mphi->split_out_instance(t_adr, igvn); |
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157 } else { |
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158 assert(phase->C->get_alias_index(t) == phase->C->get_alias_index(t_adr), "correct memory chain"); |
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159 } |
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160 } |
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161 return result; |
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162 } |
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163 |
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164 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st) { |
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165 uint alias_idx = phase->C->get_alias_index(tp); |
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166 Node *mem = mmem; |
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167 #ifdef ASSERT |
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168 { |
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169 // Check that current type is consistent with the alias index used during graph construction |
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170 assert(alias_idx >= Compile::AliasIdxRaw, "must not be a bad alias_idx"); |
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171 bool consistent = adr_check == NULL || adr_check->empty() || |
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172 phase->C->must_alias(adr_check, alias_idx ); |
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173 // Sometimes dead array references collapse to a[-1], a[-2], or a[-3] |
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174 if( !consistent && adr_check != NULL && !adr_check->empty() && |
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175 tp->isa_aryptr() && tp->offset() == Type::OffsetBot && |
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176 adr_check->isa_aryptr() && adr_check->offset() != Type::OffsetBot && |
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177 ( adr_check->offset() == arrayOopDesc::length_offset_in_bytes() || |
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178 adr_check->offset() == oopDesc::klass_offset_in_bytes() || |
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179 adr_check->offset() == oopDesc::mark_offset_in_bytes() ) ) { |
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180 // don't assert if it is dead code. |
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181 consistent = true; |
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182 } |
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183 if( !consistent ) { |
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184 st->print("alias_idx==%d, adr_check==", alias_idx); |
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185 if( adr_check == NULL ) { |
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186 st->print("NULL"); |
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187 } else { |
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188 adr_check->dump(); |
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189 } |
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190 st->cr(); |
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191 print_alias_types(); |
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192 assert(consistent, "adr_check must match alias idx"); |
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193 } |
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194 } |
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195 #endif |
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196 // TypeInstPtr::NOTNULL+any is an OOP with unknown offset - generally |
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197 // means an array I have not precisely typed yet. Do not do any |
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198 // alias stuff with it any time soon. |
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199 const TypeOopPtr *tinst = tp->isa_oopptr(); |
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200 if( tp->base() != Type::AnyPtr && |
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201 !(tinst && |
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202 tinst->klass()->is_java_lang_Object() && |
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203 tinst->offset() == Type::OffsetBot) ) { |
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204 // compress paths and change unreachable cycles to TOP |
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205 // If not, we can update the input infinitely along a MergeMem cycle |
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206 // Equivalent code in PhiNode::Ideal |
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207 Node* m = phase->transform(mmem); |
605 | 208 // If transformed to a MergeMem, get the desired slice |
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209 // Otherwise the returned node represents memory for every slice |
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210 mem = (m->is_MergeMem())? m->as_MergeMem()->memory_at(alias_idx) : m; |
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211 // Update input if it is progress over what we have now |
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212 } |
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213 return mem; |
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214 } |
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215 |
0 | 216 //--------------------------Ideal_common--------------------------------------- |
217 // Look for degenerate control and memory inputs. Bypass MergeMem inputs. | |
218 // Unhook non-raw memories from complete (macro-expanded) initializations. | |
219 Node *MemNode::Ideal_common(PhaseGVN *phase, bool can_reshape) { | |
220 // If our control input is a dead region, kill all below the region | |
221 Node *ctl = in(MemNode::Control); | |
222 if (ctl && remove_dead_region(phase, can_reshape)) | |
223 return this; | |
305 | 224 ctl = in(MemNode::Control); |
225 // Don't bother trying to transform a dead node | |
226 if( ctl && ctl->is_top() ) return NodeSentinel; | |
0 | 227 |
708
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228 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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229 // Wait if control on the worklist. |
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230 if (ctl && can_reshape && igvn != NULL) { |
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231 Node* bol = NULL; |
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232 Node* cmp = NULL; |
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233 if (ctl->in(0)->is_If()) { |
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234 assert(ctl->is_IfTrue() || ctl->is_IfFalse(), "sanity"); |
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235 bol = ctl->in(0)->in(1); |
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236 if (bol->is_Bool()) |
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237 cmp = ctl->in(0)->in(1)->in(1); |
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238 } |
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239 if (igvn->_worklist.member(ctl) || |
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240 (bol != NULL && igvn->_worklist.member(bol)) || |
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241 (cmp != NULL && igvn->_worklist.member(cmp)) ) { |
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242 // This control path may be dead. |
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243 // Delay this memory node transformation until the control is processed. |
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244 phase->is_IterGVN()->_worklist.push(this); |
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245 return NodeSentinel; // caller will return NULL |
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246 } |
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247 } |
0 | 248 // Ignore if memory is dead, or self-loop |
249 Node *mem = in(MemNode::Memory); | |
250 if( phase->type( mem ) == Type::TOP ) return NodeSentinel; // caller will return NULL | |
251 assert( mem != this, "dead loop in MemNode::Ideal" ); | |
252 | |
253 Node *address = in(MemNode::Address); | |
254 const Type *t_adr = phase->type( address ); | |
255 if( t_adr == Type::TOP ) return NodeSentinel; // caller will return NULL | |
256 | |
708
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257 if( can_reshape && igvn != NULL && |
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258 (igvn->_worklist.member(address) || phase->type(address) != adr_type()) ) { |
420
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259 // The address's base and type may change when the address is processed. |
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260 // Delay this mem node transformation until the address is processed. |
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261 phase->is_IterGVN()->_worklist.push(this); |
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262 return NodeSentinel; // caller will return NULL |
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263 } |
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264 |
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265 // Do NOT remove or optimize the next lines: ensure a new alias index |
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266 // is allocated for an oop pointer type before Escape Analysis. |
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267 // Note: C++ will not remove it since the call has side effect. |
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268 if ( t_adr->isa_oopptr() ) { |
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269 int alias_idx = phase->C->get_alias_index(t_adr->is_ptr()); |
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270 } |
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271 |
708
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272 #ifdef ASSERT |
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273 Node* base = NULL; |
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274 if (address->is_AddP()) |
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275 base = address->in(AddPNode::Base); |
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276 assert(base == NULL || t_adr->isa_rawptr() || |
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277 !phase->type(base)->higher_equal(TypePtr::NULL_PTR), "NULL+offs not RAW address?"); |
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278 #endif |
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279 |
0 | 280 // Avoid independent memory operations |
281 Node* old_mem = mem; | |
282 | |
36 | 283 // The code which unhooks non-raw memories from complete (macro-expanded) |
284 // initializations was removed. After macro-expansion all stores catched | |
285 // by Initialize node became raw stores and there is no information | |
286 // which memory slices they modify. So it is unsafe to move any memory | |
287 // operation above these stores. Also in most cases hooked non-raw memories | |
288 // were already unhooked by using information from detect_ptr_independence() | |
289 // and find_previous_store(). | |
0 | 290 |
291 if (mem->is_MergeMem()) { | |
292 MergeMemNode* mmem = mem->as_MergeMem(); | |
293 const TypePtr *tp = t_adr->is_ptr(); | |
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294 |
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295 mem = step_through_mergemem(phase, mmem, tp, adr_type(), tty); |
0 | 296 } |
297 | |
298 if (mem != old_mem) { | |
299 set_req(MemNode::Memory, mem); | |
305 | 300 if (phase->type( mem ) == Type::TOP) return NodeSentinel; |
0 | 301 return this; |
302 } | |
303 | |
304 // let the subclass continue analyzing... | |
305 return NULL; | |
306 } | |
307 | |
308 // Helper function for proving some simple control dominations. | |
119
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309 // Attempt to prove that all control inputs of 'dom' dominate 'sub'. |
0 | 310 // Already assumes that 'dom' is available at 'sub', and that 'sub' |
311 // is not a constant (dominated by the method's StartNode). | |
312 // Used by MemNode::find_previous_store to prove that the | |
313 // control input of a memory operation predates (dominates) | |
314 // an allocation it wants to look past. | |
119
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315 bool MemNode::all_controls_dominate(Node* dom, Node* sub) { |
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316 if (dom == NULL || dom->is_top() || sub == NULL || sub->is_top()) |
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317 return false; // Conservative answer for dead code |
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318 |
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319 // Check 'dom'. Skip Proj and CatchProj nodes. |
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320 dom = dom->find_exact_control(dom); |
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321 if (dom == NULL || dom->is_top()) |
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322 return false; // Conservative answer for dead code |
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323 |
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324 if (dom == sub) { |
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325 // For the case when, for example, 'sub' is Initialize and the original |
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326 // 'dom' is Proj node of the 'sub'. |
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327 return false; |
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328 } |
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329 |
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330 if (dom->is_Con() || dom->is_Start() || dom->is_Root() || dom == sub) |
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331 return true; |
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332 |
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333 // 'dom' dominates 'sub' if its control edge and control edges |
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334 // of all its inputs dominate or equal to sub's control edge. |
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335 |
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336 // Currently 'sub' is either Allocate, Initialize or Start nodes. |
163 | 337 // Or Region for the check in LoadNode::Ideal(); |
338 // 'sub' should have sub->in(0) != NULL. | |
339 assert(sub->is_Allocate() || sub->is_Initialize() || sub->is_Start() || | |
340 sub->is_Region(), "expecting only these nodes"); | |
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341 |
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342 // Get control edge of 'sub'. |
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343 Node* orig_sub = sub; |
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344 sub = sub->find_exact_control(sub->in(0)); |
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345 if (sub == NULL || sub->is_top()) |
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346 return false; // Conservative answer for dead code |
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347 |
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348 assert(sub->is_CFG(), "expecting control"); |
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349 |
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350 if (sub == dom) |
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351 return true; |
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352 |
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353 if (sub->is_Start() || sub->is_Root()) |
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354 return false; |
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355 |
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356 { |
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357 // Check all control edges of 'dom'. |
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358 |
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359 ResourceMark rm; |
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360 Arena* arena = Thread::current()->resource_area(); |
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361 Node_List nlist(arena); |
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362 Unique_Node_List dom_list(arena); |
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363 |
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364 dom_list.push(dom); |
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365 bool only_dominating_controls = false; |
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366 |
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367 for (uint next = 0; next < dom_list.size(); next++) { |
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368 Node* n = dom_list.at(next); |
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369 if (n == orig_sub) |
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370 return false; // One of dom's inputs dominated by sub. |
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371 if (!n->is_CFG() && n->pinned()) { |
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372 // Check only own control edge for pinned non-control nodes. |
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373 n = n->find_exact_control(n->in(0)); |
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374 if (n == NULL || n->is_top()) |
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375 return false; // Conservative answer for dead code |
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376 assert(n->is_CFG(), "expecting control"); |
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377 dom_list.push(n); |
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378 } else if (n->is_Con() || n->is_Start() || n->is_Root()) { |
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379 only_dominating_controls = true; |
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380 } else if (n->is_CFG()) { |
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381 if (n->dominates(sub, nlist)) |
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382 only_dominating_controls = true; |
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383 else |
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384 return false; |
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385 } else { |
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386 // First, own control edge. |
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387 Node* m = n->find_exact_control(n->in(0)); |
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388 if (m != NULL) { |
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389 if (m->is_top()) |
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390 return false; // Conservative answer for dead code |
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391 dom_list.push(m); |
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392 } |
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393 // Now, the rest of edges. |
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394 uint cnt = n->req(); |
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395 for (uint i = 1; i < cnt; i++) { |
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396 m = n->find_exact_control(n->in(i)); |
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397 if (m == NULL || m->is_top()) |
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398 continue; |
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399 dom_list.push(m); |
0 | 400 } |
401 } | |
402 } | |
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403 return only_dominating_controls; |
0 | 404 } |
405 } | |
406 | |
407 //---------------------detect_ptr_independence--------------------------------- | |
408 // Used by MemNode::find_previous_store to prove that two base | |
409 // pointers are never equal. | |
410 // The pointers are accompanied by their associated allocations, | |
411 // if any, which have been previously discovered by the caller. | |
412 bool MemNode::detect_ptr_independence(Node* p1, AllocateNode* a1, | |
413 Node* p2, AllocateNode* a2, | |
414 PhaseTransform* phase) { | |
415 // Attempt to prove that these two pointers cannot be aliased. | |
416 // They may both manifestly be allocations, and they should differ. | |
417 // Or, if they are not both allocations, they can be distinct constants. | |
418 // Otherwise, one is an allocation and the other a pre-existing value. | |
419 if (a1 == NULL && a2 == NULL) { // neither an allocation | |
420 return (p1 != p2) && p1->is_Con() && p2->is_Con(); | |
421 } else if (a1 != NULL && a2 != NULL) { // both allocations | |
422 return (a1 != a2); | |
423 } else if (a1 != NULL) { // one allocation a1 | |
424 // (Note: p2->is_Con implies p2->in(0)->is_Root, which dominates.) | |
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425 return all_controls_dominate(p2, a1); |
0 | 426 } else { //(a2 != NULL) // one allocation a2 |
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427 return all_controls_dominate(p1, a2); |
0 | 428 } |
429 return false; | |
430 } | |
431 | |
432 | |
433 // The logic for reordering loads and stores uses four steps: | |
434 // (a) Walk carefully past stores and initializations which we | |
435 // can prove are independent of this load. | |
436 // (b) Observe that the next memory state makes an exact match | |
437 // with self (load or store), and locate the relevant store. | |
438 // (c) Ensure that, if we were to wire self directly to the store, | |
439 // the optimizer would fold it up somehow. | |
440 // (d) Do the rewiring, and return, depending on some other part of | |
441 // the optimizer to fold up the load. | |
442 // This routine handles steps (a) and (b). Steps (c) and (d) are | |
443 // specific to loads and stores, so they are handled by the callers. | |
444 // (Currently, only LoadNode::Ideal has steps (c), (d). More later.) | |
445 // | |
446 Node* MemNode::find_previous_store(PhaseTransform* phase) { | |
447 Node* ctrl = in(MemNode::Control); | |
448 Node* adr = in(MemNode::Address); | |
449 intptr_t offset = 0; | |
450 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
451 AllocateNode* alloc = AllocateNode::Ideal_allocation(base, phase); | |
452 | |
453 if (offset == Type::OffsetBot) | |
454 return NULL; // cannot unalias unless there are precise offsets | |
455 | |
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456 const TypeOopPtr *addr_t = adr->bottom_type()->isa_oopptr(); |
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457 |
0 | 458 intptr_t size_in_bytes = memory_size(); |
459 | |
460 Node* mem = in(MemNode::Memory); // start searching here... | |
461 | |
462 int cnt = 50; // Cycle limiter | |
463 for (;;) { // While we can dance past unrelated stores... | |
464 if (--cnt < 0) break; // Caught in cycle or a complicated dance? | |
465 | |
466 if (mem->is_Store()) { | |
467 Node* st_adr = mem->in(MemNode::Address); | |
468 intptr_t st_offset = 0; | |
469 Node* st_base = AddPNode::Ideal_base_and_offset(st_adr, phase, st_offset); | |
470 if (st_base == NULL) | |
471 break; // inscrutable pointer | |
472 if (st_offset != offset && st_offset != Type::OffsetBot) { | |
473 const int MAX_STORE = BytesPerLong; | |
474 if (st_offset >= offset + size_in_bytes || | |
475 st_offset <= offset - MAX_STORE || | |
476 st_offset <= offset - mem->as_Store()->memory_size()) { | |
477 // Success: The offsets are provably independent. | |
478 // (You may ask, why not just test st_offset != offset and be done? | |
479 // The answer is that stores of different sizes can co-exist | |
480 // in the same sequence of RawMem effects. We sometimes initialize | |
481 // a whole 'tile' of array elements with a single jint or jlong.) | |
482 mem = mem->in(MemNode::Memory); | |
483 continue; // (a) advance through independent store memory | |
484 } | |
485 } | |
486 if (st_base != base && | |
487 detect_ptr_independence(base, alloc, | |
488 st_base, | |
489 AllocateNode::Ideal_allocation(st_base, phase), | |
490 phase)) { | |
491 // Success: The bases are provably independent. | |
492 mem = mem->in(MemNode::Memory); | |
493 continue; // (a) advance through independent store memory | |
494 } | |
495 | |
496 // (b) At this point, if the bases or offsets do not agree, we lose, | |
497 // since we have not managed to prove 'this' and 'mem' independent. | |
498 if (st_base == base && st_offset == offset) { | |
499 return mem; // let caller handle steps (c), (d) | |
500 } | |
501 | |
502 } else if (mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
503 InitializeNode* st_init = mem->in(0)->as_Initialize(); | |
504 AllocateNode* st_alloc = st_init->allocation(); | |
505 if (st_alloc == NULL) | |
506 break; // something degenerated | |
507 bool known_identical = false; | |
508 bool known_independent = false; | |
509 if (alloc == st_alloc) | |
510 known_identical = true; | |
511 else if (alloc != NULL) | |
512 known_independent = true; | |
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513 else if (all_controls_dominate(this, st_alloc)) |
0 | 514 known_independent = true; |
515 | |
516 if (known_independent) { | |
517 // The bases are provably independent: Either they are | |
518 // manifestly distinct allocations, or else the control | |
519 // of this load dominates the store's allocation. | |
520 int alias_idx = phase->C->get_alias_index(adr_type()); | |
521 if (alias_idx == Compile::AliasIdxRaw) { | |
522 mem = st_alloc->in(TypeFunc::Memory); | |
523 } else { | |
524 mem = st_init->memory(alias_idx); | |
525 } | |
526 continue; // (a) advance through independent store memory | |
527 } | |
528 | |
529 // (b) at this point, if we are not looking at a store initializing | |
530 // the same allocation we are loading from, we lose. | |
531 if (known_identical) { | |
532 // From caller, can_see_stored_value will consult find_captured_store. | |
533 return mem; // let caller handle steps (c), (d) | |
534 } | |
535 | |
223 | 536 } else if (addr_t != NULL && addr_t->is_known_instance_field()) { |
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537 // Can't use optimize_simple_memory_chain() since it needs PhaseGVN. |
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538 if (mem->is_Proj() && mem->in(0)->is_Call()) { |
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539 CallNode *call = mem->in(0)->as_Call(); |
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540 if (!call->may_modify(addr_t, phase)) { |
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541 mem = call->in(TypeFunc::Memory); |
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542 continue; // (a) advance through independent call memory |
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543 } |
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544 } else if (mem->is_Proj() && mem->in(0)->is_MemBar()) { |
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545 mem = mem->in(0)->in(TypeFunc::Memory); |
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546 continue; // (a) advance through independent MemBar memory |
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547 } else if (mem->is_ClearArray()) { |
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548 if (ClearArrayNode::step_through(&mem, (uint)addr_t->instance_id(), phase)) { |
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549 // (the call updated 'mem' value) |
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550 continue; // (a) advance through independent allocation memory |
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551 } else { |
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552 // Can not bypass initialization of the instance |
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553 // we are looking for. |
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554 return mem; |
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555 } |
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556 } else if (mem->is_MergeMem()) { |
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557 int alias_idx = phase->C->get_alias_index(adr_type()); |
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558 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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559 continue; // (a) advance through independent MergeMem memory |
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560 } |
0 | 561 } |
562 | |
563 // Unless there is an explicit 'continue', we must bail out here, | |
564 // because 'mem' is an inscrutable memory state (e.g., a call). | |
565 break; | |
566 } | |
567 | |
568 return NULL; // bail out | |
569 } | |
570 | |
571 //----------------------calculate_adr_type------------------------------------- | |
572 // Helper function. Notices when the given type of address hits top or bottom. | |
573 // Also, asserts a cross-check of the type against the expected address type. | |
574 const TypePtr* MemNode::calculate_adr_type(const Type* t, const TypePtr* cross_check) { | |
575 if (t == Type::TOP) return NULL; // does not touch memory any more? | |
576 #ifdef PRODUCT | |
577 cross_check = NULL; | |
578 #else | |
579 if (!VerifyAliases || is_error_reported() || Node::in_dump()) cross_check = NULL; | |
580 #endif | |
581 const TypePtr* tp = t->isa_ptr(); | |
582 if (tp == NULL) { | |
583 assert(cross_check == NULL || cross_check == TypePtr::BOTTOM, "expected memory type must be wide"); | |
584 return TypePtr::BOTTOM; // touches lots of memory | |
585 } else { | |
586 #ifdef ASSERT | |
587 // %%%% [phh] We don't check the alias index if cross_check is | |
588 // TypeRawPtr::BOTTOM. Needs to be investigated. | |
589 if (cross_check != NULL && | |
590 cross_check != TypePtr::BOTTOM && | |
591 cross_check != TypeRawPtr::BOTTOM) { | |
592 // Recheck the alias index, to see if it has changed (due to a bug). | |
593 Compile* C = Compile::current(); | |
594 assert(C->get_alias_index(cross_check) == C->get_alias_index(tp), | |
595 "must stay in the original alias category"); | |
596 // The type of the address must be contained in the adr_type, | |
597 // disregarding "null"-ness. | |
598 // (We make an exception for TypeRawPtr::BOTTOM, which is a bit bucket.) | |
599 const TypePtr* tp_notnull = tp->join(TypePtr::NOTNULL)->is_ptr(); | |
600 assert(cross_check->meet(tp_notnull) == cross_check, | |
601 "real address must not escape from expected memory type"); | |
602 } | |
603 #endif | |
604 return tp; | |
605 } | |
606 } | |
607 | |
608 //------------------------adr_phi_is_loop_invariant---------------------------- | |
609 // A helper function for Ideal_DU_postCCP to check if a Phi in a counted | |
610 // loop is loop invariant. Make a quick traversal of Phi and associated | |
611 // CastPP nodes, looking to see if they are a closed group within the loop. | |
612 bool MemNode::adr_phi_is_loop_invariant(Node* adr_phi, Node* cast) { | |
613 // The idea is that the phi-nest must boil down to only CastPP nodes | |
614 // with the same data. This implies that any path into the loop already | |
615 // includes such a CastPP, and so the original cast, whatever its input, | |
616 // must be covered by an equivalent cast, with an earlier control input. | |
617 ResourceMark rm; | |
618 | |
619 // The loop entry input of the phi should be the unique dominating | |
620 // node for every Phi/CastPP in the loop. | |
621 Unique_Node_List closure; | |
622 closure.push(adr_phi->in(LoopNode::EntryControl)); | |
623 | |
624 // Add the phi node and the cast to the worklist. | |
625 Unique_Node_List worklist; | |
626 worklist.push(adr_phi); | |
627 if( cast != NULL ){ | |
628 if( !cast->is_ConstraintCast() ) return false; | |
629 worklist.push(cast); | |
630 } | |
631 | |
632 // Begin recursive walk of phi nodes. | |
633 while( worklist.size() ){ | |
634 // Take a node off the worklist | |
635 Node *n = worklist.pop(); | |
636 if( !closure.member(n) ){ | |
637 // Add it to the closure. | |
638 closure.push(n); | |
639 // Make a sanity check to ensure we don't waste too much time here. | |
640 if( closure.size() > 20) return false; | |
641 // This node is OK if: | |
642 // - it is a cast of an identical value | |
643 // - or it is a phi node (then we add its inputs to the worklist) | |
644 // Otherwise, the node is not OK, and we presume the cast is not invariant | |
645 if( n->is_ConstraintCast() ){ | |
646 worklist.push(n->in(1)); | |
647 } else if( n->is_Phi() ) { | |
648 for( uint i = 1; i < n->req(); i++ ) { | |
649 worklist.push(n->in(i)); | |
650 } | |
651 } else { | |
652 return false; | |
653 } | |
654 } | |
655 } | |
656 | |
657 // Quit when the worklist is empty, and we've found no offending nodes. | |
658 return true; | |
659 } | |
660 | |
661 //------------------------------Ideal_DU_postCCP------------------------------- | |
662 // Find any cast-away of null-ness and keep its control. Null cast-aways are | |
663 // going away in this pass and we need to make this memory op depend on the | |
664 // gating null check. | |
163 | 665 Node *MemNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
666 return Ideal_common_DU_postCCP(ccp, this, in(MemNode::Address)); | |
667 } | |
0 | 668 |
669 // I tried to leave the CastPP's in. This makes the graph more accurate in | |
670 // some sense; we get to keep around the knowledge that an oop is not-null | |
671 // after some test. Alas, the CastPP's interfere with GVN (some values are | |
672 // the regular oop, some are the CastPP of the oop, all merge at Phi's which | |
673 // cannot collapse, etc). This cost us 10% on SpecJVM, even when I removed | |
674 // some of the more trivial cases in the optimizer. Removing more useless | |
675 // Phi's started allowing Loads to illegally float above null checks. I gave | |
676 // up on this approach. CNC 10/20/2000 | |
163 | 677 // This static method may be called not from MemNode (EncodePNode calls it). |
678 // Only the control edge of the node 'n' might be updated. | |
679 Node *MemNode::Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr ) { | |
0 | 680 Node *skipped_cast = NULL; |
681 // Need a null check? Regular static accesses do not because they are | |
682 // from constant addresses. Array ops are gated by the range check (which | |
683 // always includes a NULL check). Just check field ops. | |
163 | 684 if( n->in(MemNode::Control) == NULL ) { |
0 | 685 // Scan upwards for the highest location we can place this memory op. |
686 while( true ) { | |
687 switch( adr->Opcode() ) { | |
688 | |
689 case Op_AddP: // No change to NULL-ness, so peek thru AddP's | |
690 adr = adr->in(AddPNode::Base); | |
691 continue; | |
692 | |
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693 case Op_DecodeN: // No change to NULL-ness, so peek thru |
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694 adr = adr->in(1); |
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695 continue; |
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696 |
0 | 697 case Op_CastPP: |
698 // If the CastPP is useless, just peek on through it. | |
699 if( ccp->type(adr) == ccp->type(adr->in(1)) ) { | |
700 // Remember the cast that we've peeked though. If we peek | |
701 // through more than one, then we end up remembering the highest | |
702 // one, that is, if in a loop, the one closest to the top. | |
703 skipped_cast = adr; | |
704 adr = adr->in(1); | |
705 continue; | |
706 } | |
707 // CastPP is going away in this pass! We need this memory op to be | |
708 // control-dependent on the test that is guarding the CastPP. | |
163 | 709 ccp->hash_delete(n); |
710 n->set_req(MemNode::Control, adr->in(0)); | |
711 ccp->hash_insert(n); | |
712 return n; | |
0 | 713 |
714 case Op_Phi: | |
715 // Attempt to float above a Phi to some dominating point. | |
716 if (adr->in(0) != NULL && adr->in(0)->is_CountedLoop()) { | |
717 // If we've already peeked through a Cast (which could have set the | |
718 // control), we can't float above a Phi, because the skipped Cast | |
719 // may not be loop invariant. | |
720 if (adr_phi_is_loop_invariant(adr, skipped_cast)) { | |
721 adr = adr->in(1); | |
722 continue; | |
723 } | |
724 } | |
725 | |
726 // Intentional fallthrough! | |
727 | |
728 // No obvious dominating point. The mem op is pinned below the Phi | |
729 // by the Phi itself. If the Phi goes away (no true value is merged) | |
730 // then the mem op can float, but not indefinitely. It must be pinned | |
731 // behind the controls leading to the Phi. | |
732 case Op_CheckCastPP: | |
733 // These usually stick around to change address type, however a | |
734 // useless one can be elided and we still need to pick up a control edge | |
735 if (adr->in(0) == NULL) { | |
736 // This CheckCastPP node has NO control and is likely useless. But we | |
737 // need check further up the ancestor chain for a control input to keep | |
738 // the node in place. 4959717. | |
739 skipped_cast = adr; | |
740 adr = adr->in(1); | |
741 continue; | |
742 } | |
163 | 743 ccp->hash_delete(n); |
744 n->set_req(MemNode::Control, adr->in(0)); | |
745 ccp->hash_insert(n); | |
746 return n; | |
0 | 747 |
748 // List of "safe" opcodes; those that implicitly block the memory | |
749 // op below any null check. | |
750 case Op_CastX2P: // no null checks on native pointers | |
751 case Op_Parm: // 'this' pointer is not null | |
752 case Op_LoadP: // Loading from within a klass | |
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753 case Op_LoadN: // Loading from within a klass |
0 | 754 case Op_LoadKlass: // Loading from within a klass |
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755 case Op_LoadNKlass: // Loading from within a klass |
0 | 756 case Op_ConP: // Loading from a klass |
163 | 757 case Op_ConN: // Loading from a klass |
0 | 758 case Op_CreateEx: // Sucking up the guts of an exception oop |
759 case Op_Con: // Reading from TLS | |
760 case Op_CMoveP: // CMoveP is pinned | |
164
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761 case Op_CMoveN: // CMoveN is pinned |
0 | 762 break; // No progress |
763 | |
764 case Op_Proj: // Direct call to an allocation routine | |
765 case Op_SCMemProj: // Memory state from store conditional ops | |
766 #ifdef ASSERT | |
767 { | |
768 assert(adr->as_Proj()->_con == TypeFunc::Parms, "must be return value"); | |
769 const Node* call = adr->in(0); | |
163 | 770 if (call->is_CallJava()) { |
771 const CallJavaNode* call_java = call->as_CallJava(); | |
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772 const TypeTuple *r = call_java->tf()->range(); |
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773 assert(r->cnt() > TypeFunc::Parms, "must return value"); |
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774 const Type* ret_type = r->field_at(TypeFunc::Parms); |
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775 assert(ret_type && ret_type->isa_ptr(), "must return pointer"); |
0 | 776 // We further presume that this is one of |
777 // new_instance_Java, new_array_Java, or | |
778 // the like, but do not assert for this. | |
779 } else if (call->is_Allocate()) { | |
780 // similar case to new_instance_Java, etc. | |
781 } else if (!call->is_CallLeaf()) { | |
782 // Projections from fetch_oop (OSR) are allowed as well. | |
783 ShouldNotReachHere(); | |
784 } | |
785 } | |
786 #endif | |
787 break; | |
788 default: | |
789 ShouldNotReachHere(); | |
790 } | |
791 break; | |
792 } | |
793 } | |
794 | |
795 return NULL; // No progress | |
796 } | |
797 | |
798 | |
799 //============================================================================= | |
800 uint LoadNode::size_of() const { return sizeof(*this); } | |
801 uint LoadNode::cmp( const Node &n ) const | |
802 { return !Type::cmp( _type, ((LoadNode&)n)._type ); } | |
803 const Type *LoadNode::bottom_type() const { return _type; } | |
804 uint LoadNode::ideal_reg() const { | |
805 return Matcher::base2reg[_type->base()]; | |
806 } | |
807 | |
808 #ifndef PRODUCT | |
809 void LoadNode::dump_spec(outputStream *st) const { | |
810 MemNode::dump_spec(st); | |
811 if( !Verbose && !WizardMode ) { | |
812 // standard dump does this in Verbose and WizardMode | |
813 st->print(" #"); _type->dump_on(st); | |
814 } | |
815 } | |
816 #endif | |
817 | |
818 | |
819 //----------------------------LoadNode::make----------------------------------- | |
820 // Polymorphic factory method: | |
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821 Node *LoadNode::make( PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const TypePtr* adr_type, const Type *rt, BasicType bt ) { |
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822 Compile* C = gvn.C; |
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823 |
0 | 824 // sanity check the alias category against the created node type |
825 assert(!(adr_type->isa_oopptr() && | |
826 adr_type->offset() == oopDesc::klass_offset_in_bytes()), | |
827 "use LoadKlassNode instead"); | |
828 assert(!(adr_type->isa_aryptr() && | |
829 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()), | |
830 "use LoadRangeNode instead"); | |
831 switch (bt) { | |
624 | 832 case T_BOOLEAN: return new (C, 3) LoadUBNode(ctl, mem, adr, adr_type, rt->is_int() ); |
558
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833 case T_BYTE: return new (C, 3) LoadBNode (ctl, mem, adr, adr_type, rt->is_int() ); |
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834 case T_INT: return new (C, 3) LoadINode (ctl, mem, adr, adr_type, rt->is_int() ); |
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835 case T_CHAR: return new (C, 3) LoadUSNode(ctl, mem, adr, adr_type, rt->is_int() ); |
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836 case T_SHORT: return new (C, 3) LoadSNode (ctl, mem, adr, adr_type, rt->is_int() ); |
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837 case T_LONG: return new (C, 3) LoadLNode (ctl, mem, adr, adr_type, rt->is_long() ); |
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838 case T_FLOAT: return new (C, 3) LoadFNode (ctl, mem, adr, adr_type, rt ); |
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839 case T_DOUBLE: return new (C, 3) LoadDNode (ctl, mem, adr, adr_type, rt ); |
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840 case T_ADDRESS: return new (C, 3) LoadPNode (ctl, mem, adr, adr_type, rt->is_ptr() ); |
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841 case T_OBJECT: |
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842 #ifdef _LP64 |
163 | 843 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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844 Node* load = gvn.transform(new (C, 3) LoadNNode(ctl, mem, adr, adr_type, rt->make_narrowoop())); |
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845 return new (C, 2) DecodeNNode(load, load->bottom_type()->make_ptr()); |
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846 } else |
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847 #endif |
163 | 848 { |
849 assert(!adr->bottom_type()->is_ptr_to_narrowoop(), "should have got back a narrow oop"); | |
850 return new (C, 3) LoadPNode(ctl, mem, adr, adr_type, rt->is_oopptr()); | |
851 } | |
0 | 852 } |
853 ShouldNotReachHere(); | |
854 return (LoadNode*)NULL; | |
855 } | |
856 | |
857 LoadLNode* LoadLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt) { | |
858 bool require_atomic = true; | |
859 return new (C, 3) LoadLNode(ctl, mem, adr, adr_type, rt->is_long(), require_atomic); | |
860 } | |
861 | |
862 | |
863 | |
864 | |
865 //------------------------------hash------------------------------------------- | |
866 uint LoadNode::hash() const { | |
867 // unroll addition of interesting fields | |
868 return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address); | |
869 } | |
870 | |
871 //---------------------------can_see_stored_value------------------------------ | |
872 // This routine exists to make sure this set of tests is done the same | |
873 // everywhere. We need to make a coordinated change: first LoadNode::Ideal | |
874 // will change the graph shape in a way which makes memory alive twice at the | |
875 // same time (uses the Oracle model of aliasing), then some | |
876 // LoadXNode::Identity will fold things back to the equivalence-class model | |
877 // of aliasing. | |
878 Node* MemNode::can_see_stored_value(Node* st, PhaseTransform* phase) const { | |
879 Node* ld_adr = in(MemNode::Address); | |
880 | |
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881 const TypeInstPtr* tp = phase->type(ld_adr)->isa_instptr(); |
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882 Compile::AliasType* atp = tp != NULL ? phase->C->alias_type(tp) : NULL; |
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883 if (EliminateAutoBox && atp != NULL && atp->index() >= Compile::AliasIdxRaw && |
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884 atp->field() != NULL && !atp->field()->is_volatile()) { |
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885 uint alias_idx = atp->index(); |
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886 bool final = atp->field()->is_final(); |
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887 Node* result = NULL; |
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888 Node* current = st; |
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889 // Skip through chains of MemBarNodes checking the MergeMems for |
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890 // new states for the slice of this load. Stop once any other |
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891 // kind of node is encountered. Loads from final memory can skip |
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892 // through any kind of MemBar but normal loads shouldn't skip |
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893 // through MemBarAcquire since the could allow them to move out of |
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894 // a synchronized region. |
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895 while (current->is_Proj()) { |
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896 int opc = current->in(0)->Opcode(); |
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897 if ((final && opc == Op_MemBarAcquire) || |
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898 opc == Op_MemBarRelease || opc == Op_MemBarCPUOrder) { |
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899 Node* mem = current->in(0)->in(TypeFunc::Memory); |
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900 if (mem->is_MergeMem()) { |
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901 MergeMemNode* merge = mem->as_MergeMem(); |
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902 Node* new_st = merge->memory_at(alias_idx); |
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903 if (new_st == merge->base_memory()) { |
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904 // Keep searching |
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905 current = merge->base_memory(); |
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906 continue; |
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907 } |
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908 // Save the new memory state for the slice and fall through |
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909 // to exit. |
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910 result = new_st; |
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911 } |
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912 } |
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913 break; |
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914 } |
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915 if (result != NULL) { |
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|
916 st = result; |
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917 } |
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918 } |
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919 |
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920 |
0 | 921 // Loop around twice in the case Load -> Initialize -> Store. |
922 // (See PhaseIterGVN::add_users_to_worklist, which knows about this case.) | |
923 for (int trip = 0; trip <= 1; trip++) { | |
924 | |
925 if (st->is_Store()) { | |
926 Node* st_adr = st->in(MemNode::Address); | |
927 if (!phase->eqv(st_adr, ld_adr)) { | |
928 // Try harder before giving up... Match raw and non-raw pointers. | |
929 intptr_t st_off = 0; | |
930 AllocateNode* alloc = AllocateNode::Ideal_allocation(st_adr, phase, st_off); | |
931 if (alloc == NULL) return NULL; | |
932 intptr_t ld_off = 0; | |
933 AllocateNode* allo2 = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off); | |
934 if (alloc != allo2) return NULL; | |
935 if (ld_off != st_off) return NULL; | |
936 // At this point we have proven something like this setup: | |
937 // A = Allocate(...) | |
938 // L = LoadQ(, AddP(CastPP(, A.Parm),, #Off)) | |
939 // S = StoreQ(, AddP(, A.Parm , #Off), V) | |
940 // (Actually, we haven't yet proven the Q's are the same.) | |
941 // In other words, we are loading from a casted version of | |
942 // the same pointer-and-offset that we stored to. | |
943 // Thus, we are able to replace L by V. | |
944 } | |
945 // Now prove that we have a LoadQ matched to a StoreQ, for some Q. | |
946 if (store_Opcode() != st->Opcode()) | |
947 return NULL; | |
948 return st->in(MemNode::ValueIn); | |
949 } | |
950 | |
951 intptr_t offset = 0; // scratch | |
952 | |
953 // A load from a freshly-created object always returns zero. | |
954 // (This can happen after LoadNode::Ideal resets the load's memory input | |
955 // to find_captured_store, which returned InitializeNode::zero_memory.) | |
956 if (st->is_Proj() && st->in(0)->is_Allocate() && | |
957 st->in(0) == AllocateNode::Ideal_allocation(ld_adr, phase, offset) && | |
958 offset >= st->in(0)->as_Allocate()->minimum_header_size()) { | |
959 // return a zero value for the load's basic type | |
960 // (This is one of the few places where a generic PhaseTransform | |
961 // can create new nodes. Think of it as lazily manifesting | |
962 // virtually pre-existing constants.) | |
963 return phase->zerocon(memory_type()); | |
964 } | |
965 | |
966 // A load from an initialization barrier can match a captured store. | |
967 if (st->is_Proj() && st->in(0)->is_Initialize()) { | |
968 InitializeNode* init = st->in(0)->as_Initialize(); | |
969 AllocateNode* alloc = init->allocation(); | |
970 if (alloc != NULL && | |
971 alloc == AllocateNode::Ideal_allocation(ld_adr, phase, offset)) { | |
972 // examine a captured store value | |
973 st = init->find_captured_store(offset, memory_size(), phase); | |
974 if (st != NULL) | |
975 continue; // take one more trip around | |
976 } | |
977 } | |
978 | |
979 break; | |
980 } | |
981 | |
982 return NULL; | |
983 } | |
984 | |
64
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985 //----------------------is_instance_field_load_with_local_phi------------------ |
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986 bool LoadNode::is_instance_field_load_with_local_phi(Node* ctrl) { |
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987 if( in(MemNode::Memory)->is_Phi() && in(MemNode::Memory)->in(0) == ctrl && |
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988 in(MemNode::Address)->is_AddP() ) { |
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989 const TypeOopPtr* t_oop = in(MemNode::Address)->bottom_type()->isa_oopptr(); |
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990 // Only instances. |
223 | 991 if( t_oop != NULL && t_oop->is_known_instance_field() && |
64
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992 t_oop->offset() != Type::OffsetBot && |
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993 t_oop->offset() != Type::OffsetTop) { |
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994 return true; |
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995 } |
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996 } |
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997 return false; |
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998 } |
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999 |
0 | 1000 //------------------------------Identity--------------------------------------- |
1001 // Loads are identity if previous store is to same address | |
1002 Node *LoadNode::Identity( PhaseTransform *phase ) { | |
1003 // If the previous store-maker is the right kind of Store, and the store is | |
1004 // to the same address, then we are equal to the value stored. | |
1005 Node* mem = in(MemNode::Memory); | |
1006 Node* value = can_see_stored_value(mem, phase); | |
1007 if( value ) { | |
1008 // byte, short & char stores truncate naturally. | |
1009 // A load has to load the truncated value which requires | |
1010 // some sort of masking operation and that requires an | |
1011 // Ideal call instead of an Identity call. | |
1012 if (memory_size() < BytesPerInt) { | |
1013 // If the input to the store does not fit with the load's result type, | |
1014 // it must be truncated via an Ideal call. | |
1015 if (!phase->type(value)->higher_equal(phase->type(this))) | |
1016 return this; | |
1017 } | |
1018 // (This works even when value is a Con, but LoadNode::Value | |
1019 // usually runs first, producing the singleton type of the Con.) | |
1020 return value; | |
1021 } | |
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1022 |
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1023 // Search for an existing data phi which was generated before for the same |
605 | 1024 // instance's field to avoid infinite generation of phis in a loop. |
64
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1025 Node *region = mem->in(0); |
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1026 if (is_instance_field_load_with_local_phi(region)) { |
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1027 const TypePtr *addr_t = in(MemNode::Address)->bottom_type()->isa_ptr(); |
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1028 int this_index = phase->C->get_alias_index(addr_t); |
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1029 int this_offset = addr_t->offset(); |
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1030 int this_id = addr_t->is_oopptr()->instance_id(); |
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1031 const Type* this_type = bottom_type(); |
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1032 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
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1033 Node* phi = region->fast_out(i); |
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1034 if (phi->is_Phi() && phi != mem && |
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1035 phi->as_Phi()->is_same_inst_field(this_type, this_id, this_index, this_offset)) { |
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1036 return phi; |
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1037 } |
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1038 } |
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1039 } |
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1040 |
0 | 1041 return this; |
1042 } | |
1043 | |
17
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1044 |
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1045 // Returns true if the AliasType refers to the field that holds the |
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1046 // cached box array. Currently only handles the IntegerCache case. |
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1047 static bool is_autobox_cache(Compile::AliasType* atp) { |
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1048 if (atp != NULL && atp->field() != NULL) { |
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1049 ciField* field = atp->field(); |
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1050 ciSymbol* klass = field->holder()->name(); |
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1051 if (field->name() == ciSymbol::cache_field_name() && |
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1052 field->holder()->uses_default_loader() && |
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1053 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
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1054 return true; |
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1055 } |
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1056 } |
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1057 return false; |
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1058 } |
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1059 |
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1060 // Fetch the base value in the autobox array |
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1061 static bool fetch_autobox_base(Compile::AliasType* atp, int& cache_offset) { |
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1062 if (atp != NULL && atp->field() != NULL) { |
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1063 ciField* field = atp->field(); |
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1064 ciSymbol* klass = field->holder()->name(); |
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1065 if (field->name() == ciSymbol::cache_field_name() && |
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1066 field->holder()->uses_default_loader() && |
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1067 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
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1068 assert(field->is_constant(), "what?"); |
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1069 ciObjArray* array = field->constant_value().as_object()->as_obj_array(); |
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1070 // Fetch the box object at the base of the array and get its value |
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1071 ciInstance* box = array->obj_at(0)->as_instance(); |
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1072 ciInstanceKlass* ik = box->klass()->as_instance_klass(); |
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1073 if (ik->nof_nonstatic_fields() == 1) { |
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1074 // This should be true nonstatic_field_at requires calling |
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1075 // nof_nonstatic_fields so check it anyway |
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1076 ciConstant c = box->field_value(ik->nonstatic_field_at(0)); |
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1077 cache_offset = c.as_int(); |
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1078 } |
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1079 return true; |
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1080 } |
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1081 } |
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1082 return false; |
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|
1083 } |
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|
1084 |
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1085 // Returns true if the AliasType refers to the value field of an |
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1086 // autobox object. Currently only handles Integer. |
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1087 static bool is_autobox_object(Compile::AliasType* atp) { |
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1088 if (atp != NULL && atp->field() != NULL) { |
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1089 ciField* field = atp->field(); |
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1090 ciSymbol* klass = field->holder()->name(); |
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|
1091 if (field->name() == ciSymbol::value_name() && |
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|
1092 field->holder()->uses_default_loader() && |
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1093 klass == ciSymbol::java_lang_Integer()) { |
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|
1094 return true; |
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|
1095 } |
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|
1096 } |
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|
1097 return false; |
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|
1098 } |
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|
1099 |
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|
1100 |
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|
1101 // We're loading from an object which has autobox behaviour. |
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1102 // If this object is result of a valueOf call we'll have a phi |
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1103 // merging a newly allocated object and a load from the cache. |
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1104 // We want to replace this load with the original incoming |
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1105 // argument to the valueOf call. |
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1106 Node* LoadNode::eliminate_autobox(PhaseGVN* phase) { |
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1107 Node* base = in(Address)->in(AddPNode::Base); |
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1108 if (base->is_Phi() && base->req() == 3) { |
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1109 AllocateNode* allocation = NULL; |
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1110 int allocation_index = -1; |
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1111 int load_index = -1; |
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1112 for (uint i = 1; i < base->req(); i++) { |
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1113 allocation = AllocateNode::Ideal_allocation(base->in(i), phase); |
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1114 if (allocation != NULL) { |
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1115 allocation_index = i; |
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1116 load_index = 3 - allocation_index; |
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1117 break; |
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1118 } |
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1119 } |
583
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1120 bool has_load = ( allocation != NULL && |
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1121 (base->in(load_index)->is_Load() || |
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1122 base->in(load_index)->is_DecodeN() && |
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1123 base->in(load_index)->in(1)->is_Load()) ); |
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1124 if (has_load && in(Memory)->is_Phi() && in(Memory)->in(0) == base->in(0)) { |
17
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1125 // Push the loads from the phi that comes from valueOf up |
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1126 // through it to allow elimination of the loads and the recovery |
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1127 // of the original value. |
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1128 Node* mem_phi = in(Memory); |
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1129 Node* offset = in(Address)->in(AddPNode::Offset); |
553 | 1130 Node* region = base->in(0); |
17
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1131 |
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1132 Node* in1 = clone(); |
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1133 Node* in1_addr = in1->in(Address)->clone(); |
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1134 in1_addr->set_req(AddPNode::Base, base->in(allocation_index)); |
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1135 in1_addr->set_req(AddPNode::Address, base->in(allocation_index)); |
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1136 in1_addr->set_req(AddPNode::Offset, offset); |
553 | 1137 in1->set_req(0, region->in(allocation_index)); |
17
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1138 in1->set_req(Address, in1_addr); |
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1139 in1->set_req(Memory, mem_phi->in(allocation_index)); |
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1140 |
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1141 Node* in2 = clone(); |
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1142 Node* in2_addr = in2->in(Address)->clone(); |
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1143 in2_addr->set_req(AddPNode::Base, base->in(load_index)); |
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1144 in2_addr->set_req(AddPNode::Address, base->in(load_index)); |
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1145 in2_addr->set_req(AddPNode::Offset, offset); |
553 | 1146 in2->set_req(0, region->in(load_index)); |
17
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1147 in2->set_req(Address, in2_addr); |
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1148 in2->set_req(Memory, mem_phi->in(load_index)); |
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1149 |
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1150 in1_addr = phase->transform(in1_addr); |
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1151 in1 = phase->transform(in1); |
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1152 in2_addr = phase->transform(in2_addr); |
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1153 in2 = phase->transform(in2); |
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1154 |
553 | 1155 PhiNode* result = PhiNode::make_blank(region, this); |
17
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1156 result->set_req(allocation_index, in1); |
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1157 result->set_req(load_index, in2); |
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1158 return result; |
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1159 } |
583
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1160 } else if (base->is_Load() || |
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1161 base->is_DecodeN() && base->in(1)->is_Load()) { |
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1162 if (base->is_DecodeN()) { |
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1163 // Get LoadN node which loads cached Integer object |
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1164 base = base->in(1); |
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1165 } |
17
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1166 // Eliminate the load of Integer.value for integers from the cache |
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1167 // array by deriving the value from the index into the array. |
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1168 // Capture the offset of the load and then reverse the computation. |
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1169 Node* load_base = base->in(Address)->in(AddPNode::Base); |
583
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1170 if (load_base->is_DecodeN()) { |
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1171 // Get LoadN node which loads IntegerCache.cache field |
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1172 load_base = load_base->in(1); |
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1173 } |
17
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1174 if (load_base != NULL) { |
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1175 Compile::AliasType* atp = phase->C->alias_type(load_base->adr_type()); |
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1176 intptr_t cache_offset; |
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1177 int shift = -1; |
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1178 Node* cache = NULL; |
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1179 if (is_autobox_cache(atp)) { |
29
d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
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diff
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1180 shift = exact_log2(type2aelembytes(T_OBJECT)); |
17
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1181 cache = AddPNode::Ideal_base_and_offset(load_base->in(Address), phase, cache_offset); |
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1182 } |
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1183 if (cache != NULL && base->in(Address)->is_AddP()) { |
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1184 Node* elements[4]; |
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1185 int count = base->in(Address)->as_AddP()->unpack_offsets(elements, ARRAY_SIZE(elements)); |
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1186 int cache_low; |
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1187 if (count > 0 && fetch_autobox_base(atp, cache_low)) { |
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1188 int offset = arrayOopDesc::base_offset_in_bytes(memory_type()) - (cache_low << shift); |
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1189 // Add up all the offsets making of the address of the load |
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1190 Node* result = elements[0]; |
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1191 for (int i = 1; i < count; i++) { |
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1192 result = phase->transform(new (phase->C, 3) AddXNode(result, elements[i])); |
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1193 } |
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1194 // Remove the constant offset from the address and then |
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1195 // remove the scaling of the offset to recover the original index. |
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1196 result = phase->transform(new (phase->C, 3) AddXNode(result, phase->MakeConX(-offset))); |
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1197 if (result->Opcode() == Op_LShiftX && result->in(2) == phase->intcon(shift)) { |
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1198 // Peel the shift off directly but wrap it in a dummy node |
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1199 // since Ideal can't return existing nodes |
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1200 result = new (phase->C, 3) RShiftXNode(result->in(1), phase->intcon(0)); |
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1201 } else { |
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1202 result = new (phase->C, 3) RShiftXNode(result, phase->intcon(shift)); |
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1203 } |
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1204 #ifdef _LP64 |
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1205 result = new (phase->C, 2) ConvL2INode(phase->transform(result)); |
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1206 #endif |
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1207 return result; |
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1208 } |
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1209 } |
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1210 } |
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1211 } |
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1212 return NULL; |
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1213 } |
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1214 |
163 | 1215 //------------------------------split_through_phi------------------------------ |
1216 // Split instance field load through Phi. | |
1217 Node *LoadNode::split_through_phi(PhaseGVN *phase) { | |
1218 Node* mem = in(MemNode::Memory); | |
1219 Node* address = in(MemNode::Address); | |
1220 const TypePtr *addr_t = phase->type(address)->isa_ptr(); | |
1221 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); | |
1222 | |
1223 assert(mem->is_Phi() && (t_oop != NULL) && | |
223 | 1224 t_oop->is_known_instance_field(), "invalide conditions"); |
163 | 1225 |
1226 Node *region = mem->in(0); | |
1227 if (region == NULL) { | |
1228 return NULL; // Wait stable graph | |
1229 } | |
1230 uint cnt = mem->req(); | |
1231 for( uint i = 1; i < cnt; i++ ) { | |
1232 Node *in = mem->in(i); | |
1233 if( in == NULL ) { | |
1234 return NULL; // Wait stable graph | |
1235 } | |
1236 } | |
1237 // Check for loop invariant. | |
1238 if (cnt == 3) { | |
1239 for( uint i = 1; i < cnt; i++ ) { | |
1240 Node *in = mem->in(i); | |
1241 Node* m = MemNode::optimize_memory_chain(in, addr_t, phase); | |
1242 if (m == mem) { | |
1243 set_req(MemNode::Memory, mem->in(cnt - i)); // Skip this phi. | |
1244 return this; | |
1245 } | |
1246 } | |
1247 } | |
1248 // Split through Phi (see original code in loopopts.cpp). | |
1249 assert(phase->C->have_alias_type(addr_t), "instance should have alias type"); | |
1250 | |
1251 // Do nothing here if Identity will find a value | |
1252 // (to avoid infinite chain of value phis generation). | |
1253 if ( !phase->eqv(this, this->Identity(phase)) ) | |
1254 return NULL; | |
1255 | |
1256 // Skip the split if the region dominates some control edge of the address. | |
1257 if (cnt == 3 && !MemNode::all_controls_dominate(address, region)) | |
1258 return NULL; | |
1259 | |
1260 const Type* this_type = this->bottom_type(); | |
1261 int this_index = phase->C->get_alias_index(addr_t); | |
1262 int this_offset = addr_t->offset(); | |
1263 int this_iid = addr_t->is_oopptr()->instance_id(); | |
1264 int wins = 0; | |
1265 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
1266 Node *phi = new (igvn->C, region->req()) PhiNode(region, this_type, NULL, this_iid, this_index, this_offset); | |
1267 for( uint i = 1; i < region->req(); i++ ) { | |
1268 Node *x; | |
1269 Node* the_clone = NULL; | |
1270 if( region->in(i) == phase->C->top() ) { | |
1271 x = phase->C->top(); // Dead path? Use a dead data op | |
1272 } else { | |
1273 x = this->clone(); // Else clone up the data op | |
1274 the_clone = x; // Remember for possible deletion. | |
1275 // Alter data node to use pre-phi inputs | |
1276 if( this->in(0) == region ) { | |
1277 x->set_req( 0, region->in(i) ); | |
1278 } else { | |
1279 x->set_req( 0, NULL ); | |
1280 } | |
1281 for( uint j = 1; j < this->req(); j++ ) { | |
1282 Node *in = this->in(j); | |
1283 if( in->is_Phi() && in->in(0) == region ) | |
1284 x->set_req( j, in->in(i) ); // Use pre-Phi input for the clone | |
1285 } | |
1286 } | |
1287 // Check for a 'win' on some paths | |
1288 const Type *t = x->Value(igvn); | |
1289 | |
1290 bool singleton = t->singleton(); | |
1291 | |
1292 // See comments in PhaseIdealLoop::split_thru_phi(). | |
1293 if( singleton && t == Type::TOP ) { | |
1294 singleton &= region->is_Loop() && (i != LoopNode::EntryControl); | |
1295 } | |
1296 | |
1297 if( singleton ) { | |
1298 wins++; | |
1299 x = igvn->makecon(t); | |
1300 } else { | |
1301 // We now call Identity to try to simplify the cloned node. | |
1302 // Note that some Identity methods call phase->type(this). | |
1303 // Make sure that the type array is big enough for | |
1304 // our new node, even though we may throw the node away. | |
1305 // (This tweaking with igvn only works because x is a new node.) | |
1306 igvn->set_type(x, t); | |
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1307 // If x is a TypeNode, capture any more-precise type permanently into Node |
605 | 1308 // otherwise it will be not updated during igvn->transform since |
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1309 // igvn->type(x) is set to x->Value() already. |
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1310 x->raise_bottom_type(t); |
163 | 1311 Node *y = x->Identity(igvn); |
1312 if( y != x ) { | |
1313 wins++; | |
1314 x = y; | |
1315 } else { | |
1316 y = igvn->hash_find(x); | |
1317 if( y ) { | |
1318 wins++; | |
1319 x = y; | |
1320 } else { | |
1321 // Else x is a new node we are keeping | |
1322 // We do not need register_new_node_with_optimizer | |
1323 // because set_type has already been called. | |
1324 igvn->_worklist.push(x); | |
1325 } | |
1326 } | |
1327 } | |
1328 if (x != the_clone && the_clone != NULL) | |
1329 igvn->remove_dead_node(the_clone); | |
1330 phi->set_req(i, x); | |
1331 } | |
1332 if( wins > 0 ) { | |
1333 // Record Phi | |
1334 igvn->register_new_node_with_optimizer(phi); | |
1335 return phi; | |
1336 } | |
1337 igvn->remove_dead_node(phi); | |
1338 return NULL; | |
1339 } | |
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1340 |
0 | 1341 //------------------------------Ideal------------------------------------------ |
1342 // If the load is from Field memory and the pointer is non-null, we can | |
1343 // zero out the control input. | |
1344 // If the offset is constant and the base is an object allocation, | |
1345 // try to hook me up to the exact initializing store. | |
1346 Node *LoadNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1347 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
1348 if (p) return (p == NodeSentinel) ? NULL : p; | |
1349 | |
1350 Node* ctrl = in(MemNode::Control); | |
1351 Node* address = in(MemNode::Address); | |
1352 | |
1353 // Skip up past a SafePoint control. Cannot do this for Stores because | |
1354 // pointer stores & cardmarks must stay on the same side of a SafePoint. | |
1355 if( ctrl != NULL && ctrl->Opcode() == Op_SafePoint && | |
1356 phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw ) { | |
1357 ctrl = ctrl->in(0); | |
1358 set_req(MemNode::Control,ctrl); | |
1359 } | |
1360 | |
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1361 intptr_t ignore = 0; |
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1362 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); |
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1363 if (base != NULL |
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1364 && phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw) { |
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1365 // Check for useless control edge in some common special cases |
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1366 if (in(MemNode::Control) != NULL |
0 | 1367 && phase->type(base)->higher_equal(TypePtr::NOTNULL) |
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1368 && all_controls_dominate(base, phase->C->start())) { |
0 | 1369 // A method-invariant, non-null address (constant or 'this' argument). |
1370 set_req(MemNode::Control, NULL); | |
1371 } | |
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1372 |
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1373 if (EliminateAutoBox && can_reshape) { |
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1374 assert(!phase->type(base)->higher_equal(TypePtr::NULL_PTR), "the autobox pointer should be non-null"); |
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1375 Compile::AliasType* atp = phase->C->alias_type(adr_type()); |
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1376 if (is_autobox_object(atp)) { |
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1377 Node* result = eliminate_autobox(phase); |
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1378 if (result != NULL) return result; |
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1379 } |
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1380 } |
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1381 } |
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1382 |
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1383 Node* mem = in(MemNode::Memory); |
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1384 const TypePtr *addr_t = phase->type(address)->isa_ptr(); |
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1385 |
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1386 if (addr_t != NULL) { |
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1387 // try to optimize our memory input |
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1388 Node* opt_mem = MemNode::optimize_memory_chain(mem, addr_t, phase); |
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1389 if (opt_mem != mem) { |
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1390 set_req(MemNode::Memory, opt_mem); |
305 | 1391 if (phase->type( opt_mem ) == Type::TOP) return NULL; |
74
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1392 return this; |
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1393 } |
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1394 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); |
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1395 if (can_reshape && opt_mem->is_Phi() && |
223 | 1396 (t_oop != NULL) && t_oop->is_known_instance_field()) { |
163 | 1397 // Split instance field load through Phi. |
1398 Node* result = split_through_phi(phase); | |
1399 if (result != NULL) return result; | |
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1400 } |
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1401 } |
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1402 |
0 | 1403 // Check for prior store with a different base or offset; make Load |
1404 // independent. Skip through any number of them. Bail out if the stores | |
1405 // are in an endless dead cycle and report no progress. This is a key | |
1406 // transform for Reflection. However, if after skipping through the Stores | |
1407 // we can't then fold up against a prior store do NOT do the transform as | |
1408 // this amounts to using the 'Oracle' model of aliasing. It leaves the same | |
1409 // array memory alive twice: once for the hoisted Load and again after the | |
1410 // bypassed Store. This situation only works if EVERYBODY who does | |
1411 // anti-dependence work knows how to bypass. I.e. we need all | |
1412 // anti-dependence checks to ask the same Oracle. Right now, that Oracle is | |
1413 // the alias index stuff. So instead, peek through Stores and IFF we can | |
1414 // fold up, do so. | |
1415 Node* prev_mem = find_previous_store(phase); | |
1416 // Steps (a), (b): Walk past independent stores to find an exact match. | |
1417 if (prev_mem != NULL && prev_mem != in(MemNode::Memory)) { | |
1418 // (c) See if we can fold up on the spot, but don't fold up here. | |
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1419 // Fold-up might require truncation (for LoadB/LoadS/LoadUS) or |
0 | 1420 // just return a prior value, which is done by Identity calls. |
1421 if (can_see_stored_value(prev_mem, phase)) { | |
1422 // Make ready for step (d): | |
1423 set_req(MemNode::Memory, prev_mem); | |
1424 return this; | |
1425 } | |
1426 } | |
1427 | |
1428 return NULL; // No further progress | |
1429 } | |
1430 | |
1431 // Helper to recognize certain Klass fields which are invariant across | |
1432 // some group of array types (e.g., int[] or all T[] where T < Object). | |
1433 const Type* | |
1434 LoadNode::load_array_final_field(const TypeKlassPtr *tkls, | |
1435 ciKlass* klass) const { | |
1436 if (tkls->offset() == Klass::modifier_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1437 // The field is Klass::_modifier_flags. Return its (constant) value. | |
1438 // (Folds up the 2nd indirection in aClassConstant.getModifiers().) | |
1439 assert(this->Opcode() == Op_LoadI, "must load an int from _modifier_flags"); | |
1440 return TypeInt::make(klass->modifier_flags()); | |
1441 } | |
1442 if (tkls->offset() == Klass::access_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1443 // The field is Klass::_access_flags. Return its (constant) value. | |
1444 // (Folds up the 2nd indirection in Reflection.getClassAccessFlags(aClassConstant).) | |
1445 assert(this->Opcode() == Op_LoadI, "must load an int from _access_flags"); | |
1446 return TypeInt::make(klass->access_flags()); | |
1447 } | |
1448 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1449 // The field is Klass::_layout_helper. Return its constant value if known. | |
1450 assert(this->Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1451 return TypeInt::make(klass->layout_helper()); | |
1452 } | |
1453 | |
1454 // No match. | |
1455 return NULL; | |
1456 } | |
1457 | |
1458 //------------------------------Value----------------------------------------- | |
1459 const Type *LoadNode::Value( PhaseTransform *phase ) const { | |
1460 // Either input is TOP ==> the result is TOP | |
1461 Node* mem = in(MemNode::Memory); | |
1462 const Type *t1 = phase->type(mem); | |
1463 if (t1 == Type::TOP) return Type::TOP; | |
1464 Node* adr = in(MemNode::Address); | |
1465 const TypePtr* tp = phase->type(adr)->isa_ptr(); | |
1466 if (tp == NULL || tp->empty()) return Type::TOP; | |
1467 int off = tp->offset(); | |
1468 assert(off != Type::OffsetTop, "case covered by TypePtr::empty"); | |
1469 | |
1470 // Try to guess loaded type from pointer type | |
1471 if (tp->base() == Type::AryPtr) { | |
1472 const Type *t = tp->is_aryptr()->elem(); | |
1473 // Don't do this for integer types. There is only potential profit if | |
1474 // the element type t is lower than _type; that is, for int types, if _type is | |
1475 // more restrictive than t. This only happens here if one is short and the other | |
1476 // char (both 16 bits), and in those cases we've made an intentional decision | |
1477 // to use one kind of load over the other. See AndINode::Ideal and 4965907. | |
1478 // Also, do not try to narrow the type for a LoadKlass, regardless of offset. | |
1479 // | |
1480 // Yes, it is possible to encounter an expression like (LoadKlass p1:(AddP x x 8)) | |
1481 // where the _gvn.type of the AddP is wider than 8. This occurs when an earlier | |
1482 // copy p0 of (AddP x x 8) has been proven equal to p1, and the p0 has been | |
1483 // subsumed by p1. If p1 is on the worklist but has not yet been re-transformed, | |
1484 // it is possible that p1 will have a type like Foo*[int+]:NotNull*+any. | |
1485 // In fact, that could have been the original type of p1, and p1 could have | |
1486 // had an original form like p1:(AddP x x (LShiftL quux 3)), where the | |
1487 // expression (LShiftL quux 3) independently optimized to the constant 8. | |
1488 if ((t->isa_int() == NULL) && (t->isa_long() == NULL) | |
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1489 && Opcode() != Op_LoadKlass && Opcode() != Op_LoadNKlass) { |
0 | 1490 // t might actually be lower than _type, if _type is a unique |
1491 // concrete subclass of abstract class t. | |
1492 // Make sure the reference is not into the header, by comparing | |
1493 // the offset against the offset of the start of the array's data. | |
1494 // Different array types begin at slightly different offsets (12 vs. 16). | |
1495 // We choose T_BYTE as an example base type that is least restrictive | |
1496 // as to alignment, which will therefore produce the smallest | |
1497 // possible base offset. | |
1498 const int min_base_off = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
1499 if ((uint)off >= (uint)min_base_off) { // is the offset beyond the header? | |
1500 const Type* jt = t->join(_type); | |
1501 // In any case, do not allow the join, per se, to empty out the type. | |
1502 if (jt->empty() && !t->empty()) { | |
1503 // This can happen if a interface-typed array narrows to a class type. | |
1504 jt = _type; | |
1505 } | |
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1506 |
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1507 if (EliminateAutoBox && adr->is_AddP()) { |
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1508 // The pointers in the autobox arrays are always non-null |
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1509 Node* base = adr->in(AddPNode::Base); |
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1510 if (base != NULL && |
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1511 !phase->type(base)->higher_equal(TypePtr::NULL_PTR)) { |
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1512 Compile::AliasType* atp = phase->C->alias_type(base->adr_type()); |
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1513 if (is_autobox_cache(atp)) { |
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1514 return jt->join(TypePtr::NOTNULL)->is_ptr(); |
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1515 } |
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1516 } |
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1517 } |
0 | 1518 return jt; |
1519 } | |
1520 } | |
1521 } else if (tp->base() == Type::InstPtr) { | |
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1522 const TypeInstPtr* tinst = tp->is_instptr(); |
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1523 ciKlass* klass = tinst->klass(); |
0 | 1524 assert( off != Type::OffsetBot || |
1525 // arrays can be cast to Objects | |
1526 tp->is_oopptr()->klass()->is_java_lang_Object() || | |
1527 // unsafe field access may not have a constant offset | |
1528 phase->C->has_unsafe_access(), | |
1529 "Field accesses must be precise" ); | |
1530 // For oop loads, we expect the _type to be precise | |
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1531 if (OptimizeStringConcat && klass == phase->C->env()->String_klass() && |
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1532 adr->is_AddP() && off != Type::OffsetBot) { |
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1533 // For constant Strings treat the fields as compile time constants. |
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1534 Node* base = adr->in(AddPNode::Base); |
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1535 if (base->Opcode() == Op_ConP) { |
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1536 const TypeOopPtr* t = phase->type(base)->isa_oopptr(); |
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1537 ciObject* string = t->const_oop(); |
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1538 ciConstant constant = string->as_instance()->field_value_by_offset(off); |
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1539 if (constant.basic_type() == T_INT) { |
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1540 return TypeInt::make(constant.as_int()); |
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1541 } else if (constant.basic_type() == T_ARRAY) { |
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1542 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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1543 return TypeNarrowOop::make_from_constant(constant.as_object()); |
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1544 } else { |
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1545 return TypeOopPtr::make_from_constant(constant.as_object()); |
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1546 } |
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1547 } |
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1548 } |
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1549 } |
0 | 1550 } else if (tp->base() == Type::KlassPtr) { |
1551 assert( off != Type::OffsetBot || | |
1552 // arrays can be cast to Objects | |
1553 tp->is_klassptr()->klass()->is_java_lang_Object() || | |
1554 // also allow array-loading from the primary supertype | |
1555 // array during subtype checks | |
1556 Opcode() == Op_LoadKlass, | |
1557 "Field accesses must be precise" ); | |
1558 // For klass/static loads, we expect the _type to be precise | |
1559 } | |
1560 | |
1561 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1562 if (tkls != NULL && !StressReflectiveCode) { | |
1563 ciKlass* klass = tkls->klass(); | |
1564 if (klass->is_loaded() && tkls->klass_is_exact()) { | |
1565 // We are loading a field from a Klass metaobject whose identity | |
1566 // is known at compile time (the type is "exact" or "precise"). | |
1567 // Check for fields we know are maintained as constants by the VM. | |
1568 if (tkls->offset() == Klass::super_check_offset_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1569 // The field is Klass::_super_check_offset. Return its (constant) value. | |
1570 // (Folds up type checking code.) | |
1571 assert(Opcode() == Op_LoadI, "must load an int from _super_check_offset"); | |
1572 return TypeInt::make(klass->super_check_offset()); | |
1573 } | |
1574 // Compute index into primary_supers array | |
1575 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
1576 // Check for overflowing; use unsigned compare to handle the negative case. | |
1577 if( depth < ciKlass::primary_super_limit() ) { | |
1578 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1579 // (Folds up type checking code.) | |
1580 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1581 ciKlass *ss = klass->super_of_depth(depth); | |
1582 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1583 } | |
1584 const Type* aift = load_array_final_field(tkls, klass); | |
1585 if (aift != NULL) return aift; | |
1586 if (tkls->offset() == in_bytes(arrayKlass::component_mirror_offset()) + (int)sizeof(oopDesc) | |
1587 && klass->is_array_klass()) { | |
1588 // The field is arrayKlass::_component_mirror. Return its (constant) value. | |
1589 // (Folds up aClassConstant.getComponentType, common in Arrays.copyOf.) | |
1590 assert(Opcode() == Op_LoadP, "must load an oop from _component_mirror"); | |
1591 return TypeInstPtr::make(klass->as_array_klass()->component_mirror()); | |
1592 } | |
1593 if (tkls->offset() == Klass::java_mirror_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1594 // The field is Klass::_java_mirror. Return its (constant) value. | |
1595 // (Folds up the 2nd indirection in anObjConstant.getClass().) | |
1596 assert(Opcode() == Op_LoadP, "must load an oop from _java_mirror"); | |
1597 return TypeInstPtr::make(klass->java_mirror()); | |
1598 } | |
1599 } | |
1600 | |
1601 // We can still check if we are loading from the primary_supers array at a | |
1602 // shallow enough depth. Even though the klass is not exact, entries less | |
1603 // than or equal to its super depth are correct. | |
1604 if (klass->is_loaded() ) { | |
1605 ciType *inner = klass->klass(); | |
1606 while( inner->is_obj_array_klass() ) | |
1607 inner = inner->as_obj_array_klass()->base_element_type(); | |
1608 if( inner->is_instance_klass() && | |
1609 !inner->as_instance_klass()->flags().is_interface() ) { | |
1610 // Compute index into primary_supers array | |
1611 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
1612 // Check for overflowing; use unsigned compare to handle the negative case. | |
1613 if( depth < ciKlass::primary_super_limit() && | |
1614 depth <= klass->super_depth() ) { // allow self-depth checks to handle self-check case | |
1615 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1616 // (Folds up type checking code.) | |
1617 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1618 ciKlass *ss = klass->super_of_depth(depth); | |
1619 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1620 } | |
1621 } | |
1622 } | |
1623 | |
1624 // If the type is enough to determine that the thing is not an array, | |
1625 // we can give the layout_helper a positive interval type. | |
1626 // This will help short-circuit some reflective code. | |
1627 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc) | |
1628 && !klass->is_array_klass() // not directly typed as an array | |
1629 && !klass->is_interface() // specifically not Serializable & Cloneable | |
1630 && !klass->is_java_lang_Object() // not the supertype of all T[] | |
1631 ) { | |
1632 // Note: When interfaces are reliable, we can narrow the interface | |
1633 // test to (klass != Serializable && klass != Cloneable). | |
1634 assert(Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1635 jint min_size = Klass::instance_layout_helper(oopDesc::header_size(), false); | |
1636 // The key property of this type is that it folds up tests | |
1637 // for array-ness, since it proves that the layout_helper is positive. | |
1638 // Thus, a generic value like the basic object layout helper works fine. | |
1639 return TypeInt::make(min_size, max_jint, Type::WidenMin); | |
1640 } | |
1641 } | |
1642 | |
1643 // If we are loading from a freshly-allocated object, produce a zero, | |
1644 // if the load is provably beyond the header of the object. | |
1645 // (Also allow a variable load from a fresh array to produce zero.) | |
1646 if (ReduceFieldZeroing) { | |
1647 Node* value = can_see_stored_value(mem,phase); | |
1648 if (value != NULL && value->is_Con()) | |
1649 return value->bottom_type(); | |
1650 } | |
1651 | |
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1652 const TypeOopPtr *tinst = tp->isa_oopptr(); |
223 | 1653 if (tinst != NULL && tinst->is_known_instance_field()) { |
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1654 // If we have an instance type and our memory input is the |
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1655 // programs's initial memory state, there is no matching store, |
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1656 // so just return a zero of the appropriate type |
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1657 Node *mem = in(MemNode::Memory); |
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1658 if (mem->is_Parm() && mem->in(0)->is_Start()) { |
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1659 assert(mem->as_Parm()->_con == TypeFunc::Memory, "must be memory Parm"); |
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1660 return Type::get_zero_type(_type->basic_type()); |
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1661 } |
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1662 } |
0 | 1663 return _type; |
1664 } | |
1665 | |
1666 //------------------------------match_edge------------------------------------- | |
1667 // Do we Match on this edge index or not? Match only the address. | |
1668 uint LoadNode::match_edge(uint idx) const { | |
1669 return idx == MemNode::Address; | |
1670 } | |
1671 | |
1672 //--------------------------LoadBNode::Ideal-------------------------------------- | |
1673 // | |
1674 // If the previous store is to the same address as this load, | |
1675 // and the value stored was larger than a byte, replace this load | |
1676 // with the value stored truncated to a byte. If no truncation is | |
1677 // needed, the replacement is done in LoadNode::Identity(). | |
1678 // | |
1679 Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1680 Node* mem = in(MemNode::Memory); | |
1681 Node* value = can_see_stored_value(mem,phase); | |
1682 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1683 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(24)) ); | |
1684 return new (phase->C, 3) RShiftINode(result, phase->intcon(24)); | |
1685 } | |
1686 // Identity call will handle the case where truncation is not needed. | |
1687 return LoadNode::Ideal(phase, can_reshape); | |
1688 } | |
1689 | |
624 | 1690 //--------------------------LoadUBNode::Ideal------------------------------------- |
1691 // | |
1692 // If the previous store is to the same address as this load, | |
1693 // and the value stored was larger than a byte, replace this load | |
1694 // with the value stored truncated to a byte. If no truncation is | |
1695 // needed, the replacement is done in LoadNode::Identity(). | |
1696 // | |
1697 Node* LoadUBNode::Ideal(PhaseGVN* phase, bool can_reshape) { | |
1698 Node* mem = in(MemNode::Memory); | |
1699 Node* value = can_see_stored_value(mem, phase); | |
1700 if (value && !phase->type(value)->higher_equal(_type)) | |
1701 return new (phase->C, 3) AndINode(value, phase->intcon(0xFF)); | |
1702 // Identity call will handle the case where truncation is not needed. | |
1703 return LoadNode::Ideal(phase, can_reshape); | |
1704 } | |
1705 | |
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1706 //--------------------------LoadUSNode::Ideal------------------------------------- |
0 | 1707 // |
1708 // If the previous store is to the same address as this load, | |
1709 // and the value stored was larger than a char, replace this load | |
1710 // with the value stored truncated to a char. If no truncation is | |
1711 // needed, the replacement is done in LoadNode::Identity(). | |
1712 // | |
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1713 Node *LoadUSNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
0 | 1714 Node* mem = in(MemNode::Memory); |
1715 Node* value = can_see_stored_value(mem,phase); | |
1716 if( value && !phase->type(value)->higher_equal( _type ) ) | |
1717 return new (phase->C, 3) AndINode(value,phase->intcon(0xFFFF)); | |
1718 // Identity call will handle the case where truncation is not needed. | |
1719 return LoadNode::Ideal(phase, can_reshape); | |
1720 } | |
1721 | |
1722 //--------------------------LoadSNode::Ideal-------------------------------------- | |
1723 // | |
1724 // If the previous store is to the same address as this load, | |
1725 // and the value stored was larger than a short, replace this load | |
1726 // with the value stored truncated to a short. If no truncation is | |
1727 // needed, the replacement is done in LoadNode::Identity(). | |
1728 // | |
1729 Node *LoadSNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1730 Node* mem = in(MemNode::Memory); | |
1731 Node* value = can_see_stored_value(mem,phase); | |
1732 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1733 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(16)) ); | |
1734 return new (phase->C, 3) RShiftINode(result, phase->intcon(16)); | |
1735 } | |
1736 // Identity call will handle the case where truncation is not needed. | |
1737 return LoadNode::Ideal(phase, can_reshape); | |
1738 } | |
1739 | |
1740 //============================================================================= | |
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1741 //----------------------------LoadKlassNode::make------------------------------ |
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1742 // Polymorphic factory method: |
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1743 Node *LoadKlassNode::make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, const TypeKlassPtr *tk ) { |
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1744 Compile* C = gvn.C; |
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1745 Node *ctl = NULL; |
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1746 // sanity check the alias category against the created node type |
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1747 const TypeOopPtr *adr_type = adr->bottom_type()->isa_oopptr(); |
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1748 assert(adr_type != NULL, "expecting TypeOopPtr"); |
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1749 #ifdef _LP64 |
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1750 if (adr_type->is_ptr_to_narrowoop()) { |
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1751 Node* load_klass = gvn.transform(new (C, 3) LoadNKlassNode(ctl, mem, adr, at, tk->make_narrowoop())); |
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1752 return new (C, 2) DecodeNNode(load_klass, load_klass->bottom_type()->make_ptr()); |
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1753 } |
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1754 #endif |
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1755 assert(!adr_type->is_ptr_to_narrowoop(), "should have got back a narrow oop"); |
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1756 return new (C, 3) LoadKlassNode(ctl, mem, adr, at, tk); |
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1757 } |
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1758 |
0 | 1759 //------------------------------Value------------------------------------------ |
1760 const Type *LoadKlassNode::Value( PhaseTransform *phase ) const { | |
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1761 return klass_value_common(phase); |
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1762 } |
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1763 |
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1764 const Type *LoadNode::klass_value_common( PhaseTransform *phase ) const { |
0 | 1765 // Either input is TOP ==> the result is TOP |
1766 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1767 if (t1 == Type::TOP) return Type::TOP; | |
1768 Node *adr = in(MemNode::Address); | |
1769 const Type *t2 = phase->type( adr ); | |
1770 if (t2 == Type::TOP) return Type::TOP; | |
1771 const TypePtr *tp = t2->is_ptr(); | |
1772 if (TypePtr::above_centerline(tp->ptr()) || | |
1773 tp->ptr() == TypePtr::Null) return Type::TOP; | |
1774 | |
1775 // Return a more precise klass, if possible | |
1776 const TypeInstPtr *tinst = tp->isa_instptr(); | |
1777 if (tinst != NULL) { | |
1778 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
1779 int offset = tinst->offset(); | |
1780 if (ik == phase->C->env()->Class_klass() | |
1781 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
1782 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
1783 // We are loading a special hidden field from a Class mirror object, | |
1784 // the field which points to the VM's Klass metaobject. | |
1785 ciType* t = tinst->java_mirror_type(); | |
1786 // java_mirror_type returns non-null for compile-time Class constants. | |
1787 if (t != NULL) { | |
1788 // constant oop => constant klass | |
1789 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
1790 return TypeKlassPtr::make(ciArrayKlass::make(t)); | |
1791 } | |
1792 if (!t->is_klass()) { | |
1793 // a primitive Class (e.g., int.class) has NULL for a klass field | |
1794 return TypePtr::NULL_PTR; | |
1795 } | |
1796 // (Folds up the 1st indirection in aClassConstant.getModifiers().) | |
1797 return TypeKlassPtr::make(t->as_klass()); | |
1798 } | |
1799 // non-constant mirror, so we can't tell what's going on | |
1800 } | |
1801 if( !ik->is_loaded() ) | |
1802 return _type; // Bail out if not loaded | |
1803 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1804 if (tinst->klass_is_exact()) { | |
1805 return TypeKlassPtr::make(ik); | |
1806 } | |
1807 // See if we can become precise: no subklasses and no interface | |
1808 // (Note: We need to support verified interfaces.) | |
1809 if (!ik->is_interface() && !ik->has_subklass()) { | |
1810 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1811 // Add a dependence; if any subclass added we need to recompile | |
1812 if (!ik->is_final()) { | |
1813 // %%% should use stronger assert_unique_concrete_subtype instead | |
1814 phase->C->dependencies()->assert_leaf_type(ik); | |
1815 } | |
1816 // Return precise klass | |
1817 return TypeKlassPtr::make(ik); | |
1818 } | |
1819 | |
1820 // Return root of possible klass | |
1821 return TypeKlassPtr::make(TypePtr::NotNull, ik, 0/*offset*/); | |
1822 } | |
1823 } | |
1824 | |
1825 // Check for loading klass from an array | |
1826 const TypeAryPtr *tary = tp->isa_aryptr(); | |
1827 if( tary != NULL ) { | |
1828 ciKlass *tary_klass = tary->klass(); | |
1829 if (tary_klass != NULL // can be NULL when at BOTTOM or TOP | |
1830 && tary->offset() == oopDesc::klass_offset_in_bytes()) { | |
1831 if (tary->klass_is_exact()) { | |
1832 return TypeKlassPtr::make(tary_klass); | |
1833 } | |
1834 ciArrayKlass *ak = tary->klass()->as_array_klass(); | |
1835 // If the klass is an object array, we defer the question to the | |
1836 // array component klass. | |
1837 if( ak->is_obj_array_klass() ) { | |
1838 assert( ak->is_loaded(), "" ); | |
1839 ciKlass *base_k = ak->as_obj_array_klass()->base_element_klass(); | |
1840 if( base_k->is_loaded() && base_k->is_instance_klass() ) { | |
1841 ciInstanceKlass* ik = base_k->as_instance_klass(); | |
1842 // See if we can become precise: no subklasses and no interface | |
1843 if (!ik->is_interface() && !ik->has_subklass()) { | |
1844 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1845 // Add a dependence; if any subclass added we need to recompile | |
1846 if (!ik->is_final()) { | |
1847 phase->C->dependencies()->assert_leaf_type(ik); | |
1848 } | |
1849 // Return precise array klass | |
1850 return TypeKlassPtr::make(ak); | |
1851 } | |
1852 } | |
1853 return TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
1854 } else { // Found a type-array? | |
1855 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1856 assert( ak->is_type_array_klass(), "" ); | |
1857 return TypeKlassPtr::make(ak); // These are always precise | |
1858 } | |
1859 } | |
1860 } | |
1861 | |
1862 // Check for loading klass from an array klass | |
1863 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1864 if (tkls != NULL && !StressReflectiveCode) { | |
1865 ciKlass* klass = tkls->klass(); | |
1866 if( !klass->is_loaded() ) | |
1867 return _type; // Bail out if not loaded | |
1868 if( klass->is_obj_array_klass() && | |
1869 (uint)tkls->offset() == objArrayKlass::element_klass_offset_in_bytes() + sizeof(oopDesc)) { | |
1870 ciKlass* elem = klass->as_obj_array_klass()->element_klass(); | |
1871 // // Always returning precise element type is incorrect, | |
1872 // // e.g., element type could be object and array may contain strings | |
1873 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0); | |
1874 | |
1875 // The array's TypeKlassPtr was declared 'precise' or 'not precise' | |
1876 // according to the element type's subclassing. | |
1877 return TypeKlassPtr::make(tkls->ptr(), elem, 0/*offset*/); | |
1878 } | |
1879 if( klass->is_instance_klass() && tkls->klass_is_exact() && | |
1880 (uint)tkls->offset() == Klass::super_offset_in_bytes() + sizeof(oopDesc)) { | |
1881 ciKlass* sup = klass->as_instance_klass()->super(); | |
1882 // The field is Klass::_super. Return its (constant) value. | |
1883 // (Folds up the 2nd indirection in aClassConstant.getSuperClass().) | |
1884 return sup ? TypeKlassPtr::make(sup) : TypePtr::NULL_PTR; | |
1885 } | |
1886 } | |
1887 | |
1888 // Bailout case | |
1889 return LoadNode::Value(phase); | |
1890 } | |
1891 | |
1892 //------------------------------Identity--------------------------------------- | |
1893 // To clean up reflective code, simplify k.java_mirror.as_klass to plain k. | |
1894 // Also feed through the klass in Allocate(...klass...)._klass. | |
1895 Node* LoadKlassNode::Identity( PhaseTransform *phase ) { | |
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1896 return klass_identity_common(phase); |
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1897 } |
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1898 |
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1899 Node* LoadNode::klass_identity_common(PhaseTransform *phase ) { |
0 | 1900 Node* x = LoadNode::Identity(phase); |
1901 if (x != this) return x; | |
1902 | |
1903 // Take apart the address into an oop and and offset. | |
1904 // Return 'this' if we cannot. | |
1905 Node* adr = in(MemNode::Address); | |
1906 intptr_t offset = 0; | |
1907 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
1908 if (base == NULL) return this; | |
1909 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr(); | |
1910 if (toop == NULL) return this; | |
1911 | |
1912 // We can fetch the klass directly through an AllocateNode. | |
1913 // This works even if the klass is not constant (clone or newArray). | |
1914 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1915 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase); | |
1916 if (allocated_klass != NULL) { | |
1917 return allocated_klass; | |
1918 } | |
1919 } | |
1920 | |
1921 // Simplify k.java_mirror.as_klass to plain k, where k is a klassOop. | |
1922 // Simplify ak.component_mirror.array_klass to plain ak, ak an arrayKlass. | |
1923 // See inline_native_Class_query for occurrences of these patterns. | |
1924 // Java Example: x.getClass().isAssignableFrom(y) | |
1925 // Java Example: Array.newInstance(x.getClass().getComponentType(), n) | |
1926 // | |
1927 // This improves reflective code, often making the Class | |
1928 // mirror go completely dead. (Current exception: Class | |
1929 // mirrors may appear in debug info, but we could clean them out by | |
1930 // introducing a new debug info operator for klassOop.java_mirror). | |
1931 if (toop->isa_instptr() && toop->klass() == phase->C->env()->Class_klass() | |
1932 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
1933 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
1934 // We are loading a special hidden field from a Class mirror, | |
1935 // the field which points to its Klass or arrayKlass metaobject. | |
1936 if (base->is_Load()) { | |
1937 Node* adr2 = base->in(MemNode::Address); | |
1938 const TypeKlassPtr* tkls = phase->type(adr2)->isa_klassptr(); | |
1939 if (tkls != NULL && !tkls->empty() | |
1940 && (tkls->klass()->is_instance_klass() || | |
1941 tkls->klass()->is_array_klass()) | |
1942 && adr2->is_AddP() | |
1943 ) { | |
1944 int mirror_field = Klass::java_mirror_offset_in_bytes(); | |
1945 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
1946 mirror_field = in_bytes(arrayKlass::component_mirror_offset()); | |
1947 } | |
1948 if (tkls->offset() == mirror_field + (int)sizeof(oopDesc)) { | |
1949 return adr2->in(AddPNode::Base); | |
1950 } | |
1951 } | |
1952 } | |
1953 } | |
1954 | |
1955 return this; | |
1956 } | |
1957 | |
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1958 |
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1959 //------------------------------Value------------------------------------------ |
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1960 const Type *LoadNKlassNode::Value( PhaseTransform *phase ) const { |
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1961 const Type *t = klass_value_common(phase); |
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1962 if (t == Type::TOP) |
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1963 return t; |
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1964 |
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1965 return t->make_narrowoop(); |
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1966 } |
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1967 |
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1968 //------------------------------Identity--------------------------------------- |
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1969 // To clean up reflective code, simplify k.java_mirror.as_klass to narrow k. |
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1970 // Also feed through the klass in Allocate(...klass...)._klass. |
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1971 Node* LoadNKlassNode::Identity( PhaseTransform *phase ) { |
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1972 Node *x = klass_identity_common(phase); |
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1973 |
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1974 const Type *t = phase->type( x ); |
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1975 if( t == Type::TOP ) return x; |
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1976 if( t->isa_narrowoop()) return x; |
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1977 |
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1978 return phase->transform(new (phase->C, 2) EncodePNode(x, t->make_narrowoop())); |
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1979 } |
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1980 |
0 | 1981 //------------------------------Value----------------------------------------- |
1982 const Type *LoadRangeNode::Value( PhaseTransform *phase ) const { | |
1983 // Either input is TOP ==> the result is TOP | |
1984 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1985 if( t1 == Type::TOP ) return Type::TOP; | |
1986 Node *adr = in(MemNode::Address); | |
1987 const Type *t2 = phase->type( adr ); | |
1988 if( t2 == Type::TOP ) return Type::TOP; | |
1989 const TypePtr *tp = t2->is_ptr(); | |
1990 if (TypePtr::above_centerline(tp->ptr())) return Type::TOP; | |
1991 const TypeAryPtr *tap = tp->isa_aryptr(); | |
1992 if( !tap ) return _type; | |
1993 return tap->size(); | |
1994 } | |
1995 | |
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1996 //-------------------------------Ideal--------------------------------------- |
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1997 // Feed through the length in AllocateArray(...length...)._length. |
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1998 Node *LoadRangeNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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1999 Node* p = MemNode::Ideal_common(phase, can_reshape); |
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2000 if (p) return (p == NodeSentinel) ? NULL : p; |
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2001 |
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2002 // Take apart the address into an oop and and offset. |
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2003 // Return 'this' if we cannot. |
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2004 Node* adr = in(MemNode::Address); |
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2005 intptr_t offset = 0; |
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2006 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); |
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2007 if (base == NULL) return NULL; |
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2008 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); |
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2009 if (tary == NULL) return NULL; |
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2010 |
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2011 // We can fetch the length directly through an AllocateArrayNode. |
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2012 // This works even if the length is not constant (clone or newArray). |
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2013 if (offset == arrayOopDesc::length_offset_in_bytes()) { |
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2014 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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2015 if (alloc != NULL) { |
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2016 Node* allocated_length = alloc->Ideal_length(); |
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2017 Node* len = alloc->make_ideal_length(tary, phase); |
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2018 if (allocated_length != len) { |
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2019 // New CastII improves on this. |
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2020 return len; |
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2021 } |
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2022 } |
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2023 } |
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2024 |
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2025 return NULL; |
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2026 } |
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2027 |
0 | 2028 //------------------------------Identity--------------------------------------- |
2029 // Feed through the length in AllocateArray(...length...)._length. | |
2030 Node* LoadRangeNode::Identity( PhaseTransform *phase ) { | |
2031 Node* x = LoadINode::Identity(phase); | |
2032 if (x != this) return x; | |
2033 | |
2034 // Take apart the address into an oop and and offset. | |
2035 // Return 'this' if we cannot. | |
2036 Node* adr = in(MemNode::Address); | |
2037 intptr_t offset = 0; | |
2038 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
2039 if (base == NULL) return this; | |
2040 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); | |
2041 if (tary == NULL) return this; | |
2042 | |
2043 // We can fetch the length directly through an AllocateArrayNode. | |
2044 // This works even if the length is not constant (clone or newArray). | |
2045 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
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2046 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(base, phase); |
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2047 if (alloc != NULL) { |
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2048 Node* allocated_length = alloc->Ideal_length(); |
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2049 // Do not allow make_ideal_length to allocate a CastII node. |
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2050 Node* len = alloc->make_ideal_length(tary, phase, false); |
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2051 if (allocated_length == len) { |
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2052 // Return allocated_length only if it would not be improved by a CastII. |
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2053 return allocated_length; |
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2054 } |
0 | 2055 } |
2056 } | |
2057 | |
2058 return this; | |
2059 | |
2060 } | |
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2061 |
0 | 2062 //============================================================================= |
2063 //---------------------------StoreNode::make----------------------------------- | |
2064 // Polymorphic factory method: | |
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2065 StoreNode* StoreNode::make( PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, BasicType bt ) { |
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2066 Compile* C = gvn.C; |
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2067 |
0 | 2068 switch (bt) { |
2069 case T_BOOLEAN: | |
2070 case T_BYTE: return new (C, 4) StoreBNode(ctl, mem, adr, adr_type, val); | |
2071 case T_INT: return new (C, 4) StoreINode(ctl, mem, adr, adr_type, val); | |
2072 case T_CHAR: | |
2073 case T_SHORT: return new (C, 4) StoreCNode(ctl, mem, adr, adr_type, val); | |
2074 case T_LONG: return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val); | |
2075 case T_FLOAT: return new (C, 4) StoreFNode(ctl, mem, adr, adr_type, val); | |
2076 case T_DOUBLE: return new (C, 4) StoreDNode(ctl, mem, adr, adr_type, val); | |
2077 case T_ADDRESS: | |
113
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2078 case T_OBJECT: |
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2079 #ifdef _LP64 |
163 | 2080 if (adr->bottom_type()->is_ptr_to_narrowoop() || |
113
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2081 (UseCompressedOops && val->bottom_type()->isa_klassptr() && |
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2082 adr->bottom_type()->isa_rawptr())) { |
221
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2083 val = gvn.transform(new (C, 2) EncodePNode(val, val->bottom_type()->make_narrowoop())); |
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2084 return new (C, 4) StoreNNode(ctl, mem, adr, adr_type, val); |
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2085 } else |
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2086 #endif |
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2087 { |
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2088 return new (C, 4) StorePNode(ctl, mem, adr, adr_type, val); |
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2089 } |
0 | 2090 } |
2091 ShouldNotReachHere(); | |
2092 return (StoreNode*)NULL; | |
2093 } | |
2094 | |
2095 StoreLNode* StoreLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val) { | |
2096 bool require_atomic = true; | |
2097 return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val, require_atomic); | |
2098 } | |
2099 | |
2100 | |
2101 //--------------------------bottom_type---------------------------------------- | |
2102 const Type *StoreNode::bottom_type() const { | |
2103 return Type::MEMORY; | |
2104 } | |
2105 | |
2106 //------------------------------hash------------------------------------------- | |
2107 uint StoreNode::hash() const { | |
2108 // unroll addition of interesting fields | |
2109 //return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address) + (uintptr_t)in(ValueIn); | |
2110 | |
2111 // Since they are not commoned, do not hash them: | |
2112 return NO_HASH; | |
2113 } | |
2114 | |
2115 //------------------------------Ideal------------------------------------------ | |
2116 // Change back-to-back Store(, p, x) -> Store(m, p, y) to Store(m, p, x). | |
2117 // When a store immediately follows a relevant allocation/initialization, | |
2118 // try to capture it into the initialization, or hoist it above. | |
2119 Node *StoreNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
2120 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
2121 if (p) return (p == NodeSentinel) ? NULL : p; | |
2122 | |
2123 Node* mem = in(MemNode::Memory); | |
2124 Node* address = in(MemNode::Address); | |
2125 | |
2126 // Back-to-back stores to same address? Fold em up. | |
2127 // Generally unsafe if I have intervening uses... | |
2128 if (mem->is_Store() && phase->eqv_uncast(mem->in(MemNode::Address), address)) { | |
2129 // Looking at a dead closed cycle of memory? | |
2130 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal"); | |
2131 | |
2132 assert(Opcode() == mem->Opcode() || | |
2133 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw, | |
2134 "no mismatched stores, except on raw memory"); | |
2135 | |
2136 if (mem->outcnt() == 1 && // check for intervening uses | |
2137 mem->as_Store()->memory_size() <= this->memory_size()) { | |
2138 // If anybody other than 'this' uses 'mem', we cannot fold 'mem' away. | |
2139 // For example, 'mem' might be the final state at a conditional return. | |
2140 // Or, 'mem' might be used by some node which is live at the same time | |
2141 // 'this' is live, which might be unschedulable. So, require exactly | |
2142 // ONE user, the 'this' store, until such time as we clone 'mem' for | |
2143 // each of 'mem's uses (thus making the exactly-1-user-rule hold true). | |
2144 if (can_reshape) { // (%%% is this an anachronism?) | |
2145 set_req_X(MemNode::Memory, mem->in(MemNode::Memory), | |
2146 phase->is_IterGVN()); | |
2147 } else { | |
2148 // It's OK to do this in the parser, since DU info is always accurate, | |
2149 // and the parser always refers to nodes via SafePointNode maps. | |
2150 set_req(MemNode::Memory, mem->in(MemNode::Memory)); | |
2151 } | |
2152 return this; | |
2153 } | |
2154 } | |
2155 | |
2156 // Capture an unaliased, unconditional, simple store into an initializer. | |
2157 // Or, if it is independent of the allocation, hoist it above the allocation. | |
2158 if (ReduceFieldZeroing && /*can_reshape &&*/ | |
2159 mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
2160 InitializeNode* init = mem->in(0)->as_Initialize(); | |
2161 intptr_t offset = init->can_capture_store(this, phase); | |
2162 if (offset > 0) { | |
2163 Node* moved = init->capture_store(this, offset, phase); | |
2164 // If the InitializeNode captured me, it made a raw copy of me, | |
2165 // and I need to disappear. | |
2166 if (moved != NULL) { | |
2167 // %%% hack to ensure that Ideal returns a new node: | |
2168 mem = MergeMemNode::make(phase->C, mem); | |
2169 return mem; // fold me away | |
2170 } | |
2171 } | |
2172 } | |
2173 | |
2174 return NULL; // No further progress | |
2175 } | |
2176 | |
2177 //------------------------------Value----------------------------------------- | |
2178 const Type *StoreNode::Value( PhaseTransform *phase ) const { | |
2179 // Either input is TOP ==> the result is TOP | |
2180 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2181 if( t1 == Type::TOP ) return Type::TOP; | |
2182 const Type *t2 = phase->type( in(MemNode::Address) ); | |
2183 if( t2 == Type::TOP ) return Type::TOP; | |
2184 const Type *t3 = phase->type( in(MemNode::ValueIn) ); | |
2185 if( t3 == Type::TOP ) return Type::TOP; | |
2186 return Type::MEMORY; | |
2187 } | |
2188 | |
2189 //------------------------------Identity--------------------------------------- | |
2190 // Remove redundant stores: | |
2191 // Store(m, p, Load(m, p)) changes to m. | |
2192 // Store(, p, x) -> Store(m, p, x) changes to Store(m, p, x). | |
2193 Node *StoreNode::Identity( PhaseTransform *phase ) { | |
2194 Node* mem = in(MemNode::Memory); | |
2195 Node* adr = in(MemNode::Address); | |
2196 Node* val = in(MemNode::ValueIn); | |
2197 | |
2198 // Load then Store? Then the Store is useless | |
2199 if (val->is_Load() && | |
2200 phase->eqv_uncast( val->in(MemNode::Address), adr ) && | |
2201 phase->eqv_uncast( val->in(MemNode::Memory ), mem ) && | |
2202 val->as_Load()->store_Opcode() == Opcode()) { | |
2203 return mem; | |
2204 } | |
2205 | |
2206 // Two stores in a row of the same value? | |
2207 if (mem->is_Store() && | |
2208 phase->eqv_uncast( mem->in(MemNode::Address), adr ) && | |
2209 phase->eqv_uncast( mem->in(MemNode::ValueIn), val ) && | |
2210 mem->Opcode() == Opcode()) { | |
2211 return mem; | |
2212 } | |
2213 | |
2214 // Store of zero anywhere into a freshly-allocated object? | |
2215 // Then the store is useless. | |
2216 // (It must already have been captured by the InitializeNode.) | |
2217 if (ReduceFieldZeroing && phase->type(val)->is_zero_type()) { | |
2218 // a newly allocated object is already all-zeroes everywhere | |
2219 if (mem->is_Proj() && mem->in(0)->is_Allocate()) { | |
2220 return mem; | |
2221 } | |
2222 | |
2223 // the store may also apply to zero-bits in an earlier object | |
2224 Node* prev_mem = find_previous_store(phase); | |
2225 // Steps (a), (b): Walk past independent stores to find an exact match. | |
2226 if (prev_mem != NULL) { | |
2227 Node* prev_val = can_see_stored_value(prev_mem, phase); | |
2228 if (prev_val != NULL && phase->eqv(prev_val, val)) { | |
2229 // prev_val and val might differ by a cast; it would be good | |
2230 // to keep the more informative of the two. | |
2231 return mem; | |
2232 } | |
2233 } | |
2234 } | |
2235 | |
2236 return this; | |
2237 } | |
2238 | |
2239 //------------------------------match_edge------------------------------------- | |
2240 // Do we Match on this edge index or not? Match only memory & value | |
2241 uint StoreNode::match_edge(uint idx) const { | |
2242 return idx == MemNode::Address || idx == MemNode::ValueIn; | |
2243 } | |
2244 | |
2245 //------------------------------cmp-------------------------------------------- | |
2246 // Do not common stores up together. They generally have to be split | |
2247 // back up anyways, so do not bother. | |
2248 uint StoreNode::cmp( const Node &n ) const { | |
2249 return (&n == this); // Always fail except on self | |
2250 } | |
2251 | |
2252 //------------------------------Ideal_masked_input----------------------------- | |
2253 // Check for a useless mask before a partial-word store | |
2254 // (StoreB ... (AndI valIn conIa) ) | |
2255 // If (conIa & mask == mask) this simplifies to | |
2256 // (StoreB ... (valIn) ) | |
2257 Node *StoreNode::Ideal_masked_input(PhaseGVN *phase, uint mask) { | |
2258 Node *val = in(MemNode::ValueIn); | |
2259 if( val->Opcode() == Op_AndI ) { | |
2260 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2261 if( t && t->is_con() && (t->get_con() & mask) == mask ) { | |
2262 set_req(MemNode::ValueIn, val->in(1)); | |
2263 return this; | |
2264 } | |
2265 } | |
2266 return NULL; | |
2267 } | |
2268 | |
2269 | |
2270 //------------------------------Ideal_sign_extended_input---------------------- | |
2271 // Check for useless sign-extension before a partial-word store | |
2272 // (StoreB ... (RShiftI _ (LShiftI _ valIn conIL ) conIR) ) | |
2273 // If (conIL == conIR && conIR <= num_bits) this simplifies to | |
2274 // (StoreB ... (valIn) ) | |
2275 Node *StoreNode::Ideal_sign_extended_input(PhaseGVN *phase, int num_bits) { | |
2276 Node *val = in(MemNode::ValueIn); | |
2277 if( val->Opcode() == Op_RShiftI ) { | |
2278 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2279 if( t && t->is_con() && (t->get_con() <= num_bits) ) { | |
2280 Node *shl = val->in(1); | |
2281 if( shl->Opcode() == Op_LShiftI ) { | |
2282 const TypeInt *t2 = phase->type( shl->in(2) )->isa_int(); | |
2283 if( t2 && t2->is_con() && (t2->get_con() == t->get_con()) ) { | |
2284 set_req(MemNode::ValueIn, shl->in(1)); | |
2285 return this; | |
2286 } | |
2287 } | |
2288 } | |
2289 } | |
2290 return NULL; | |
2291 } | |
2292 | |
2293 //------------------------------value_never_loaded----------------------------------- | |
2294 // Determine whether there are any possible loads of the value stored. | |
2295 // For simplicity, we actually check if there are any loads from the | |
2296 // address stored to, not just for loads of the value stored by this node. | |
2297 // | |
2298 bool StoreNode::value_never_loaded( PhaseTransform *phase) const { | |
2299 Node *adr = in(Address); | |
2300 const TypeOopPtr *adr_oop = phase->type(adr)->isa_oopptr(); | |
2301 if (adr_oop == NULL) | |
2302 return false; | |
223 | 2303 if (!adr_oop->is_known_instance_field()) |
0 | 2304 return false; // if not a distinct instance, there may be aliases of the address |
2305 for (DUIterator_Fast imax, i = adr->fast_outs(imax); i < imax; i++) { | |
2306 Node *use = adr->fast_out(i); | |
2307 int opc = use->Opcode(); | |
2308 if (use->is_Load() || use->is_LoadStore()) { | |
2309 return false; | |
2310 } | |
2311 } | |
2312 return true; | |
2313 } | |
2314 | |
2315 //============================================================================= | |
2316 //------------------------------Ideal------------------------------------------ | |
2317 // If the store is from an AND mask that leaves the low bits untouched, then | |
2318 // we can skip the AND operation. If the store is from a sign-extension | |
2319 // (a left shift, then right shift) we can skip both. | |
2320 Node *StoreBNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2321 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFF); | |
2322 if( progress != NULL ) return progress; | |
2323 | |
2324 progress = StoreNode::Ideal_sign_extended_input(phase, 24); | |
2325 if( progress != NULL ) return progress; | |
2326 | |
2327 // Finally check the default case | |
2328 return StoreNode::Ideal(phase, can_reshape); | |
2329 } | |
2330 | |
2331 //============================================================================= | |
2332 //------------------------------Ideal------------------------------------------ | |
2333 // If the store is from an AND mask that leaves the low bits untouched, then | |
2334 // we can skip the AND operation | |
2335 Node *StoreCNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2336 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFFFF); | |
2337 if( progress != NULL ) return progress; | |
2338 | |
2339 progress = StoreNode::Ideal_sign_extended_input(phase, 16); | |
2340 if( progress != NULL ) return progress; | |
2341 | |
2342 // Finally check the default case | |
2343 return StoreNode::Ideal(phase, can_reshape); | |
2344 } | |
2345 | |
2346 //============================================================================= | |
2347 //------------------------------Identity--------------------------------------- | |
2348 Node *StoreCMNode::Identity( PhaseTransform *phase ) { | |
2349 // No need to card mark when storing a null ptr | |
2350 Node* my_store = in(MemNode::OopStore); | |
2351 if (my_store->is_Store()) { | |
2352 const Type *t1 = phase->type( my_store->in(MemNode::ValueIn) ); | |
2353 if( t1 == TypePtr::NULL_PTR ) { | |
2354 return in(MemNode::Memory); | |
2355 } | |
2356 } | |
2357 return this; | |
2358 } | |
2359 | |
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2360 //============================================================================= |
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2361 //------------------------------Ideal--------------------------------------- |
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2362 Node *StoreCMNode::Ideal(PhaseGVN *phase, bool can_reshape){ |
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2363 Node* progress = StoreNode::Ideal(phase, can_reshape); |
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2364 if (progress != NULL) return progress; |
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2365 |
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2366 Node* my_store = in(MemNode::OopStore); |
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2367 if (my_store->is_MergeMem()) { |
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2368 Node* mem = my_store->as_MergeMem()->memory_at(oop_alias_idx()); |
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2369 set_req(MemNode::OopStore, mem); |
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2370 return this; |
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2371 } |
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2372 |
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2373 return NULL; |
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2374 } |
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2375 |
0 | 2376 //------------------------------Value----------------------------------------- |
2377 const Type *StoreCMNode::Value( PhaseTransform *phase ) const { | |
43 | 2378 // Either input is TOP ==> the result is TOP |
2379 const Type *t = phase->type( in(MemNode::Memory) ); | |
2380 if( t == Type::TOP ) return Type::TOP; | |
2381 t = phase->type( in(MemNode::Address) ); | |
2382 if( t == Type::TOP ) return Type::TOP; | |
2383 t = phase->type( in(MemNode::ValueIn) ); | |
2384 if( t == Type::TOP ) return Type::TOP; | |
0 | 2385 // If extra input is TOP ==> the result is TOP |
43 | 2386 t = phase->type( in(MemNode::OopStore) ); |
2387 if( t == Type::TOP ) return Type::TOP; | |
0 | 2388 |
2389 return StoreNode::Value( phase ); | |
2390 } | |
2391 | |
2392 | |
2393 //============================================================================= | |
2394 //----------------------------------SCMemProjNode------------------------------ | |
2395 const Type * SCMemProjNode::Value( PhaseTransform *phase ) const | |
2396 { | |
2397 return bottom_type(); | |
2398 } | |
2399 | |
2400 //============================================================================= | |
2401 LoadStoreNode::LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex ) : Node(5) { | |
2402 init_req(MemNode::Control, c ); | |
2403 init_req(MemNode::Memory , mem); | |
2404 init_req(MemNode::Address, adr); | |
2405 init_req(MemNode::ValueIn, val); | |
2406 init_req( ExpectedIn, ex ); | |
2407 init_class_id(Class_LoadStore); | |
2408 | |
2409 } | |
2410 | |
2411 //============================================================================= | |
2412 //-------------------------------adr_type-------------------------------------- | |
2413 // Do we Match on this edge index or not? Do not match memory | |
2414 const TypePtr* ClearArrayNode::adr_type() const { | |
2415 Node *adr = in(3); | |
2416 return MemNode::calculate_adr_type(adr->bottom_type()); | |
2417 } | |
2418 | |
2419 //------------------------------match_edge------------------------------------- | |
2420 // Do we Match on this edge index or not? Do not match memory | |
2421 uint ClearArrayNode::match_edge(uint idx) const { | |
2422 return idx > 1; | |
2423 } | |
2424 | |
2425 //------------------------------Identity--------------------------------------- | |
2426 // Clearing a zero length array does nothing | |
2427 Node *ClearArrayNode::Identity( PhaseTransform *phase ) { | |
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2428 return phase->type(in(2))->higher_equal(TypeX::ZERO) ? in(1) : this; |
0 | 2429 } |
2430 | |
2431 //------------------------------Idealize--------------------------------------- | |
2432 // Clearing a short array is faster with stores | |
2433 Node *ClearArrayNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2434 const int unit = BytesPerLong; | |
2435 const TypeX* t = phase->type(in(2))->isa_intptr_t(); | |
2436 if (!t) return NULL; | |
2437 if (!t->is_con()) return NULL; | |
2438 intptr_t raw_count = t->get_con(); | |
2439 intptr_t size = raw_count; | |
2440 if (!Matcher::init_array_count_is_in_bytes) size *= unit; | |
2441 // Clearing nothing uses the Identity call. | |
2442 // Negative clears are possible on dead ClearArrays | |
2443 // (see jck test stmt114.stmt11402.val). | |
2444 if (size <= 0 || size % unit != 0) return NULL; | |
2445 intptr_t count = size / unit; | |
2446 // Length too long; use fast hardware clear | |
2447 if (size > Matcher::init_array_short_size) return NULL; | |
2448 Node *mem = in(1); | |
2449 if( phase->type(mem)==Type::TOP ) return NULL; | |
2450 Node *adr = in(3); | |
2451 const Type* at = phase->type(adr); | |
2452 if( at==Type::TOP ) return NULL; | |
2453 const TypePtr* atp = at->isa_ptr(); | |
2454 // adjust atp to be the correct array element address type | |
2455 if (atp == NULL) atp = TypePtr::BOTTOM; | |
2456 else atp = atp->add_offset(Type::OffsetBot); | |
2457 // Get base for derived pointer purposes | |
2458 if( adr->Opcode() != Op_AddP ) Unimplemented(); | |
2459 Node *base = adr->in(1); | |
2460 | |
2461 Node *zero = phase->makecon(TypeLong::ZERO); | |
2462 Node *off = phase->MakeConX(BytesPerLong); | |
2463 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
2464 count--; | |
2465 while( count-- ) { | |
2466 mem = phase->transform(mem); | |
2467 adr = phase->transform(new (phase->C, 4) AddPNode(base,adr,off)); | |
2468 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
2469 } | |
2470 return mem; | |
2471 } | |
2472 | |
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2473 //----------------------------step_through---------------------------------- |
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2474 // Return allocation input memory edge if it is different instance |
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2475 // or itself if it is the one we are looking for. |
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2476 bool ClearArrayNode::step_through(Node** np, uint instance_id, PhaseTransform* phase) { |
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2477 Node* n = *np; |
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2478 assert(n->is_ClearArray(), "sanity"); |
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2479 intptr_t offset; |
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2480 AllocateNode* alloc = AllocateNode::Ideal_allocation(n->in(3), phase, offset); |
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2481 // This method is called only before Allocate nodes are expanded during |
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2482 // macro nodes expansion. Before that ClearArray nodes are only generated |
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2483 // in LibraryCallKit::generate_arraycopy() which follows allocations. |
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2484 assert(alloc != NULL, "should have allocation"); |
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2485 if (alloc->_idx == instance_id) { |
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2486 // Can not bypass initialization of the instance we are looking for. |
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2487 return false; |
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|
2488 } |
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2489 // Otherwise skip it. |
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2490 InitializeNode* init = alloc->initialization(); |
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2491 if (init != NULL) |
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2492 *np = init->in(TypeFunc::Memory); |
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2493 else |
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2494 *np = alloc->in(TypeFunc::Memory); |
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2495 return true; |
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2496 } |
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2497 |
0 | 2498 //----------------------------clear_memory------------------------------------- |
2499 // Generate code to initialize object storage to zero. | |
2500 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2501 intptr_t start_offset, | |
2502 Node* end_offset, | |
2503 PhaseGVN* phase) { | |
2504 Compile* C = phase->C; | |
2505 intptr_t offset = start_offset; | |
2506 | |
2507 int unit = BytesPerLong; | |
2508 if ((offset % unit) != 0) { | |
2509 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(offset)); | |
2510 adr = phase->transform(adr); | |
2511 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2512 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
0 | 2513 mem = phase->transform(mem); |
2514 offset += BytesPerInt; | |
2515 } | |
2516 assert((offset % unit) == 0, ""); | |
2517 | |
2518 // Initialize the remaining stuff, if any, with a ClearArray. | |
2519 return clear_memory(ctl, mem, dest, phase->MakeConX(offset), end_offset, phase); | |
2520 } | |
2521 | |
2522 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2523 Node* start_offset, | |
2524 Node* end_offset, | |
2525 PhaseGVN* phase) { | |
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2526 if (start_offset == end_offset) { |
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2527 // nothing to do |
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2528 return mem; |
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2529 } |
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2530 |
0 | 2531 Compile* C = phase->C; |
2532 int unit = BytesPerLong; | |
2533 Node* zbase = start_offset; | |
2534 Node* zend = end_offset; | |
2535 | |
2536 // Scale to the unit required by the CPU: | |
2537 if (!Matcher::init_array_count_is_in_bytes) { | |
2538 Node* shift = phase->intcon(exact_log2(unit)); | |
2539 zbase = phase->transform( new(C,3) URShiftXNode(zbase, shift) ); | |
2540 zend = phase->transform( new(C,3) URShiftXNode(zend, shift) ); | |
2541 } | |
2542 | |
2543 Node* zsize = phase->transform( new(C,3) SubXNode(zend, zbase) ); | |
2544 Node* zinit = phase->zerocon((unit == BytesPerLong) ? T_LONG : T_INT); | |
2545 | |
2546 // Bulk clear double-words | |
2547 Node* adr = phase->transform( new(C,4) AddPNode(dest, dest, start_offset) ); | |
2548 mem = new (C, 4) ClearArrayNode(ctl, mem, zsize, adr); | |
2549 return phase->transform(mem); | |
2550 } | |
2551 | |
2552 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2553 intptr_t start_offset, | |
2554 intptr_t end_offset, | |
2555 PhaseGVN* phase) { | |
68
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2556 if (start_offset == end_offset) { |
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2557 // nothing to do |
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2558 return mem; |
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2559 } |
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2560 |
0 | 2561 Compile* C = phase->C; |
2562 assert((end_offset % BytesPerInt) == 0, "odd end offset"); | |
2563 intptr_t done_offset = end_offset; | |
2564 if ((done_offset % BytesPerLong) != 0) { | |
2565 done_offset -= BytesPerInt; | |
2566 } | |
2567 if (done_offset > start_offset) { | |
2568 mem = clear_memory(ctl, mem, dest, | |
2569 start_offset, phase->MakeConX(done_offset), phase); | |
2570 } | |
2571 if (done_offset < end_offset) { // emit the final 32-bit store | |
2572 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(done_offset)); | |
2573 adr = phase->transform(adr); | |
2574 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2575 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
0 | 2576 mem = phase->transform(mem); |
2577 done_offset += BytesPerInt; | |
2578 } | |
2579 assert(done_offset == end_offset, ""); | |
2580 return mem; | |
2581 } | |
2582 | |
2583 //============================================================================= | |
2584 // Do we match on this edge? No memory edges | |
2585 uint StrCompNode::match_edge(uint idx) const { | |
986
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2586 return idx == 2 || idx == 3; // StrComp (Binary str1 cnt1) (Binary str2 cnt2) |
0 | 2587 } |
2588 | |
2589 //------------------------------Ideal------------------------------------------ | |
2590 // Return a node which is more "ideal" than the current node. Strip out | |
2591 // control copies | |
2592 Node *StrCompNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2593 return remove_dead_region(phase, can_reshape) ? this : NULL; | |
2594 } | |
2595 | |
986
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2596 //============================================================================= |
681 | 2597 // Do we match on this edge? No memory edges |
2598 uint StrEqualsNode::match_edge(uint idx) const { | |
986
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2599 return idx == 2 || idx == 3; // StrEquals (Binary str1 str2) cnt |
681 | 2600 } |
2601 | |
2602 //------------------------------Ideal------------------------------------------ | |
2603 // Return a node which is more "ideal" than the current node. Strip out | |
2604 // control copies | |
2605 Node *StrEqualsNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2606 return remove_dead_region(phase, can_reshape) ? this : NULL; | |
2607 } | |
2608 | |
2609 //============================================================================= | |
2610 // Do we match on this edge? No memory edges | |
2611 uint StrIndexOfNode::match_edge(uint idx) const { | |
986
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2612 return idx == 2 || idx == 3; // StrIndexOf (Binary str1 cnt1) (Binary str2 cnt2) |
681 | 2613 } |
2614 | |
2615 //------------------------------Ideal------------------------------------------ | |
2616 // Return a node which is more "ideal" than the current node. Strip out | |
2617 // control copies | |
2618 Node *StrIndexOfNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2619 return remove_dead_region(phase, can_reshape) ? this : NULL; | |
2620 } | |
2621 | |
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2622 //============================================================================= |
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2623 // Do we match on this edge? No memory edges |
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2624 uint AryEqNode::match_edge(uint idx) const { |
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2625 return idx == 2 || idx == 3; // StrEquals ary1 ary2 |
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2626 } |
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2627 //------------------------------Ideal------------------------------------------ |
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2628 // Return a node which is more "ideal" than the current node. Strip out |
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2629 // control copies |
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2630 Node *AryEqNode::Ideal(PhaseGVN *phase, bool can_reshape){ |
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2631 return remove_dead_region(phase, can_reshape) ? this : NULL; |
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2632 } |
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2633 |
0 | 2634 //============================================================================= |
2635 MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent) | |
2636 : MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)), | |
2637 _adr_type(C->get_adr_type(alias_idx)) | |
2638 { | |
2639 init_class_id(Class_MemBar); | |
2640 Node* top = C->top(); | |
2641 init_req(TypeFunc::I_O,top); | |
2642 init_req(TypeFunc::FramePtr,top); | |
2643 init_req(TypeFunc::ReturnAdr,top); | |
2644 if (precedent != NULL) | |
2645 init_req(TypeFunc::Parms, precedent); | |
2646 } | |
2647 | |
2648 //------------------------------cmp-------------------------------------------- | |
2649 uint MemBarNode::hash() const { return NO_HASH; } | |
2650 uint MemBarNode::cmp( const Node &n ) const { | |
2651 return (&n == this); // Always fail except on self | |
2652 } | |
2653 | |
2654 //------------------------------make------------------------------------------- | |
2655 MemBarNode* MemBarNode::make(Compile* C, int opcode, int atp, Node* pn) { | |
2656 int len = Precedent + (pn == NULL? 0: 1); | |
2657 switch (opcode) { | |
2658 case Op_MemBarAcquire: return new(C, len) MemBarAcquireNode(C, atp, pn); | |
2659 case Op_MemBarRelease: return new(C, len) MemBarReleaseNode(C, atp, pn); | |
2660 case Op_MemBarVolatile: return new(C, len) MemBarVolatileNode(C, atp, pn); | |
2661 case Op_MemBarCPUOrder: return new(C, len) MemBarCPUOrderNode(C, atp, pn); | |
2662 case Op_Initialize: return new(C, len) InitializeNode(C, atp, pn); | |
2663 default: ShouldNotReachHere(); return NULL; | |
2664 } | |
2665 } | |
2666 | |
2667 //------------------------------Ideal------------------------------------------ | |
2668 // Return a node which is more "ideal" than the current node. Strip out | |
2669 // control copies | |
2670 Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1100
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2671 if (remove_dead_region(phase, can_reshape)) return this; |
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2672 |
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2673 // Eliminate volatile MemBars for scalar replaced objects. |
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2674 if (can_reshape && req() == (Precedent+1) && |
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2675 (Opcode() == Op_MemBarAcquire || Opcode() == Op_MemBarVolatile)) { |
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2676 // Volatile field loads and stores. |
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2677 Node* my_mem = in(MemBarNode::Precedent); |
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2678 if (my_mem != NULL && my_mem->is_Mem()) { |
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2679 const TypeOopPtr* t_oop = my_mem->in(MemNode::Address)->bottom_type()->isa_oopptr(); |
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2680 // Check for scalar replaced object reference. |
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2681 if( t_oop != NULL && t_oop->is_known_instance_field() && |
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2682 t_oop->offset() != Type::OffsetBot && |
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2683 t_oop->offset() != Type::OffsetTop) { |
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2684 // Replace MemBar projections by its inputs. |
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2685 PhaseIterGVN* igvn = phase->is_IterGVN(); |
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2686 igvn->replace_node(proj_out(TypeFunc::Memory), in(TypeFunc::Memory)); |
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2687 igvn->replace_node(proj_out(TypeFunc::Control), in(TypeFunc::Control)); |
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2688 // Must return either the original node (now dead) or a new node |
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2689 // (Do not return a top here, since that would break the uniqueness of top.) |
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2690 return new (phase->C, 1) ConINode(TypeInt::ZERO); |
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2691 } |
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2692 } |
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2693 } |
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2694 return NULL; |
0 | 2695 } |
2696 | |
2697 //------------------------------Value------------------------------------------ | |
2698 const Type *MemBarNode::Value( PhaseTransform *phase ) const { | |
2699 if( !in(0) ) return Type::TOP; | |
2700 if( phase->type(in(0)) == Type::TOP ) | |
2701 return Type::TOP; | |
2702 return TypeTuple::MEMBAR; | |
2703 } | |
2704 | |
2705 //------------------------------match------------------------------------------ | |
2706 // Construct projections for memory. | |
2707 Node *MemBarNode::match( const ProjNode *proj, const Matcher *m ) { | |
2708 switch (proj->_con) { | |
2709 case TypeFunc::Control: | |
2710 case TypeFunc::Memory: | |
2711 return new (m->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); | |
2712 } | |
2713 ShouldNotReachHere(); | |
2714 return NULL; | |
2715 } | |
2716 | |
2717 //===========================InitializeNode==================================== | |
2718 // SUMMARY: | |
2719 // This node acts as a memory barrier on raw memory, after some raw stores. | |
2720 // The 'cooked' oop value feeds from the Initialize, not the Allocation. | |
2721 // The Initialize can 'capture' suitably constrained stores as raw inits. | |
2722 // It can coalesce related raw stores into larger units (called 'tiles'). | |
2723 // It can avoid zeroing new storage for memory units which have raw inits. | |
2724 // At macro-expansion, it is marked 'complete', and does not optimize further. | |
2725 // | |
2726 // EXAMPLE: | |
2727 // The object 'new short[2]' occupies 16 bytes in a 32-bit machine. | |
2728 // ctl = incoming control; mem* = incoming memory | |
2729 // (Note: A star * on a memory edge denotes I/O and other standard edges.) | |
2730 // First allocate uninitialized memory and fill in the header: | |
2731 // alloc = (Allocate ctl mem* 16 #short[].klass ...) | |
2732 // ctl := alloc.Control; mem* := alloc.Memory* | |
2733 // rawmem = alloc.Memory; rawoop = alloc.RawAddress | |
2734 // Then initialize to zero the non-header parts of the raw memory block: | |
2735 // init = (Initialize alloc.Control alloc.Memory* alloc.RawAddress) | |
2736 // ctl := init.Control; mem.SLICE(#short[*]) := init.Memory | |
2737 // After the initialize node executes, the object is ready for service: | |
2738 // oop := (CheckCastPP init.Control alloc.RawAddress #short[]) | |
2739 // Suppose its body is immediately initialized as {1,2}: | |
2740 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
2741 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
2742 // mem.SLICE(#short[*]) := store2 | |
2743 // | |
2744 // DETAILS: | |
2745 // An InitializeNode collects and isolates object initialization after | |
2746 // an AllocateNode and before the next possible safepoint. As a | |
2747 // memory barrier (MemBarNode), it keeps critical stores from drifting | |
2748 // down past any safepoint or any publication of the allocation. | |
2749 // Before this barrier, a newly-allocated object may have uninitialized bits. | |
2750 // After this barrier, it may be treated as a real oop, and GC is allowed. | |
2751 // | |
2752 // The semantics of the InitializeNode include an implicit zeroing of | |
2753 // the new object from object header to the end of the object. | |
2754 // (The object header and end are determined by the AllocateNode.) | |
2755 // | |
2756 // Certain stores may be added as direct inputs to the InitializeNode. | |
2757 // These stores must update raw memory, and they must be to addresses | |
2758 // derived from the raw address produced by AllocateNode, and with | |
2759 // a constant offset. They must be ordered by increasing offset. | |
2760 // The first one is at in(RawStores), the last at in(req()-1). | |
2761 // Unlike most memory operations, they are not linked in a chain, | |
2762 // but are displayed in parallel as users of the rawmem output of | |
2763 // the allocation. | |
2764 // | |
2765 // (See comments in InitializeNode::capture_store, which continue | |
2766 // the example given above.) | |
2767 // | |
2768 // When the associated Allocate is macro-expanded, the InitializeNode | |
2769 // may be rewritten to optimize collected stores. A ClearArrayNode | |
2770 // may also be created at that point to represent any required zeroing. | |
2771 // The InitializeNode is then marked 'complete', prohibiting further | |
2772 // capturing of nearby memory operations. | |
2773 // | |
2774 // During macro-expansion, all captured initializations which store | |
605 | 2775 // constant values of 32 bits or smaller are coalesced (if advantageous) |
0 | 2776 // into larger 'tiles' 32 or 64 bits. This allows an object to be |
2777 // initialized in fewer memory operations. Memory words which are | |
2778 // covered by neither tiles nor non-constant stores are pre-zeroed | |
2779 // by explicit stores of zero. (The code shape happens to do all | |
2780 // zeroing first, then all other stores, with both sequences occurring | |
2781 // in order of ascending offsets.) | |
2782 // | |
2783 // Alternatively, code may be inserted between an AllocateNode and its | |
2784 // InitializeNode, to perform arbitrary initialization of the new object. | |
2785 // E.g., the object copying intrinsics insert complex data transfers here. | |
2786 // The initialization must then be marked as 'complete' disable the | |
2787 // built-in zeroing semantics and the collection of initializing stores. | |
2788 // | |
2789 // While an InitializeNode is incomplete, reads from the memory state | |
2790 // produced by it are optimizable if they match the control edge and | |
2791 // new oop address associated with the allocation/initialization. | |
2792 // They return a stored value (if the offset matches) or else zero. | |
2793 // A write to the memory state, if it matches control and address, | |
2794 // and if it is to a constant offset, may be 'captured' by the | |
2795 // InitializeNode. It is cloned as a raw memory operation and rewired | |
2796 // inside the initialization, to the raw oop produced by the allocation. | |
2797 // Operations on addresses which are provably distinct (e.g., to | |
2798 // other AllocateNodes) are allowed to bypass the initialization. | |
2799 // | |
2800 // The effect of all this is to consolidate object initialization | |
2801 // (both arrays and non-arrays, both piecewise and bulk) into a | |
2802 // single location, where it can be optimized as a unit. | |
2803 // | |
2804 // Only stores with an offset less than TrackedInitializationLimit words | |
2805 // will be considered for capture by an InitializeNode. This puts a | |
2806 // reasonable limit on the complexity of optimized initializations. | |
2807 | |
2808 //---------------------------InitializeNode------------------------------------ | |
2809 InitializeNode::InitializeNode(Compile* C, int adr_type, Node* rawoop) | |
2810 : _is_complete(false), | |
2811 MemBarNode(C, adr_type, rawoop) | |
2812 { | |
2813 init_class_id(Class_Initialize); | |
2814 | |
2815 assert(adr_type == Compile::AliasIdxRaw, "only valid atp"); | |
2816 assert(in(RawAddress) == rawoop, "proper init"); | |
2817 // Note: allocation() can be NULL, for secondary initialization barriers | |
2818 } | |
2819 | |
2820 // Since this node is not matched, it will be processed by the | |
2821 // register allocator. Declare that there are no constraints | |
2822 // on the allocation of the RawAddress edge. | |
2823 const RegMask &InitializeNode::in_RegMask(uint idx) const { | |
2824 // This edge should be set to top, by the set_complete. But be conservative. | |
2825 if (idx == InitializeNode::RawAddress) | |
2826 return *(Compile::current()->matcher()->idealreg2spillmask[in(idx)->ideal_reg()]); | |
2827 return RegMask::Empty; | |
2828 } | |
2829 | |
2830 Node* InitializeNode::memory(uint alias_idx) { | |
2831 Node* mem = in(Memory); | |
2832 if (mem->is_MergeMem()) { | |
2833 return mem->as_MergeMem()->memory_at(alias_idx); | |
2834 } else { | |
2835 // incoming raw memory is not split | |
2836 return mem; | |
2837 } | |
2838 } | |
2839 | |
2840 bool InitializeNode::is_non_zero() { | |
2841 if (is_complete()) return false; | |
2842 remove_extra_zeroes(); | |
2843 return (req() > RawStores); | |
2844 } | |
2845 | |
2846 void InitializeNode::set_complete(PhaseGVN* phase) { | |
2847 assert(!is_complete(), "caller responsibility"); | |
2848 _is_complete = true; | |
2849 | |
2850 // After this node is complete, it contains a bunch of | |
2851 // raw-memory initializations. There is no need for | |
2852 // it to have anything to do with non-raw memory effects. | |
2853 // Therefore, tell all non-raw users to re-optimize themselves, | |
2854 // after skipping the memory effects of this initialization. | |
2855 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
2856 if (igvn) igvn->add_users_to_worklist(this); | |
2857 } | |
2858 | |
2859 // convenience function | |
2860 // return false if the init contains any stores already | |
2861 bool AllocateNode::maybe_set_complete(PhaseGVN* phase) { | |
2862 InitializeNode* init = initialization(); | |
2863 if (init == NULL || init->is_complete()) return false; | |
2864 init->remove_extra_zeroes(); | |
2865 // for now, if this allocation has already collected any inits, bail: | |
2866 if (init->is_non_zero()) return false; | |
2867 init->set_complete(phase); | |
2868 return true; | |
2869 } | |
2870 | |
2871 void InitializeNode::remove_extra_zeroes() { | |
2872 if (req() == RawStores) return; | |
2873 Node* zmem = zero_memory(); | |
2874 uint fill = RawStores; | |
2875 for (uint i = fill; i < req(); i++) { | |
2876 Node* n = in(i); | |
2877 if (n->is_top() || n == zmem) continue; // skip | |
2878 if (fill < i) set_req(fill, n); // compact | |
2879 ++fill; | |
2880 } | |
2881 // delete any empty spaces created: | |
2882 while (fill < req()) { | |
2883 del_req(fill); | |
2884 } | |
2885 } | |
2886 | |
2887 // Helper for remembering which stores go with which offsets. | |
2888 intptr_t InitializeNode::get_store_offset(Node* st, PhaseTransform* phase) { | |
2889 if (!st->is_Store()) return -1; // can happen to dead code via subsume_node | |
2890 intptr_t offset = -1; | |
2891 Node* base = AddPNode::Ideal_base_and_offset(st->in(MemNode::Address), | |
2892 phase, offset); | |
2893 if (base == NULL) return -1; // something is dead, | |
2894 if (offset < 0) return -1; // dead, dead | |
2895 return offset; | |
2896 } | |
2897 | |
2898 // Helper for proving that an initialization expression is | |
2899 // "simple enough" to be folded into an object initialization. | |
2900 // Attempts to prove that a store's initial value 'n' can be captured | |
2901 // within the initialization without creating a vicious cycle, such as: | |
2902 // { Foo p = new Foo(); p.next = p; } | |
2903 // True for constants and parameters and small combinations thereof. | |
2904 bool InitializeNode::detect_init_independence(Node* n, | |
2905 bool st_is_pinned, | |
2906 int& count) { | |
2907 if (n == NULL) return true; // (can this really happen?) | |
2908 if (n->is_Proj()) n = n->in(0); | |
2909 if (n == this) return false; // found a cycle | |
2910 if (n->is_Con()) return true; | |
2911 if (n->is_Start()) return true; // params, etc., are OK | |
2912 if (n->is_Root()) return true; // even better | |
2913 | |
2914 Node* ctl = n->in(0); | |
2915 if (ctl != NULL && !ctl->is_top()) { | |
2916 if (ctl->is_Proj()) ctl = ctl->in(0); | |
2917 if (ctl == this) return false; | |
2918 | |
2919 // If we already know that the enclosing memory op is pinned right after | |
2920 // the init, then any control flow that the store has picked up | |
2921 // must have preceded the init, or else be equal to the init. | |
2922 // Even after loop optimizations (which might change control edges) | |
2923 // a store is never pinned *before* the availability of its inputs. | |
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2924 if (!MemNode::all_controls_dominate(n, this)) |
0 | 2925 return false; // failed to prove a good control |
2926 | |
2927 } | |
2928 | |
2929 // Check data edges for possible dependencies on 'this'. | |
2930 if ((count += 1) > 20) return false; // complexity limit | |
2931 for (uint i = 1; i < n->req(); i++) { | |
2932 Node* m = n->in(i); | |
2933 if (m == NULL || m == n || m->is_top()) continue; | |
2934 uint first_i = n->find_edge(m); | |
2935 if (i != first_i) continue; // process duplicate edge just once | |
2936 if (!detect_init_independence(m, st_is_pinned, count)) { | |
2937 return false; | |
2938 } | |
2939 } | |
2940 | |
2941 return true; | |
2942 } | |
2943 | |
2944 // Here are all the checks a Store must pass before it can be moved into | |
2945 // an initialization. Returns zero if a check fails. | |
2946 // On success, returns the (constant) offset to which the store applies, | |
2947 // within the initialized memory. | |
2948 intptr_t InitializeNode::can_capture_store(StoreNode* st, PhaseTransform* phase) { | |
2949 const int FAIL = 0; | |
2950 if (st->req() != MemNode::ValueIn + 1) | |
2951 return FAIL; // an inscrutable StoreNode (card mark?) | |
2952 Node* ctl = st->in(MemNode::Control); | |
2953 if (!(ctl != NULL && ctl->is_Proj() && ctl->in(0) == this)) | |
2954 return FAIL; // must be unconditional after the initialization | |
2955 Node* mem = st->in(MemNode::Memory); | |
2956 if (!(mem->is_Proj() && mem->in(0) == this)) | |
2957 return FAIL; // must not be preceded by other stores | |
2958 Node* adr = st->in(MemNode::Address); | |
2959 intptr_t offset; | |
2960 AllocateNode* alloc = AllocateNode::Ideal_allocation(adr, phase, offset); | |
2961 if (alloc == NULL) | |
2962 return FAIL; // inscrutable address | |
2963 if (alloc != allocation()) | |
2964 return FAIL; // wrong allocation! (store needs to float up) | |
2965 Node* val = st->in(MemNode::ValueIn); | |
2966 int complexity_count = 0; | |
2967 if (!detect_init_independence(val, true, complexity_count)) | |
2968 return FAIL; // stored value must be 'simple enough' | |
2969 | |
2970 return offset; // success | |
2971 } | |
2972 | |
2973 // Find the captured store in(i) which corresponds to the range | |
2974 // [start..start+size) in the initialized object. | |
2975 // If there is one, return its index i. If there isn't, return the | |
2976 // negative of the index where it should be inserted. | |
2977 // Return 0 if the queried range overlaps an initialization boundary | |
2978 // or if dead code is encountered. | |
2979 // If size_in_bytes is zero, do not bother with overlap checks. | |
2980 int InitializeNode::captured_store_insertion_point(intptr_t start, | |
2981 int size_in_bytes, | |
2982 PhaseTransform* phase) { | |
2983 const int FAIL = 0, MAX_STORE = BytesPerLong; | |
2984 | |
2985 if (is_complete()) | |
2986 return FAIL; // arraycopy got here first; punt | |
2987 | |
2988 assert(allocation() != NULL, "must be present"); | |
2989 | |
2990 // no negatives, no header fields: | |
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2991 if (start < (intptr_t) allocation()->minimum_header_size()) return FAIL; |
0 | 2992 |
2993 // after a certain size, we bail out on tracking all the stores: | |
2994 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
2995 if (start >= ti_limit) return FAIL; | |
2996 | |
2997 for (uint i = InitializeNode::RawStores, limit = req(); ; ) { | |
2998 if (i >= limit) return -(int)i; // not found; here is where to put it | |
2999 | |
3000 Node* st = in(i); | |
3001 intptr_t st_off = get_store_offset(st, phase); | |
3002 if (st_off < 0) { | |
3003 if (st != zero_memory()) { | |
3004 return FAIL; // bail out if there is dead garbage | |
3005 } | |
3006 } else if (st_off > start) { | |
3007 // ...we are done, since stores are ordered | |
3008 if (st_off < start + size_in_bytes) { | |
3009 return FAIL; // the next store overlaps | |
3010 } | |
3011 return -(int)i; // not found; here is where to put it | |
3012 } else if (st_off < start) { | |
3013 if (size_in_bytes != 0 && | |
3014 start < st_off + MAX_STORE && | |
3015 start < st_off + st->as_Store()->memory_size()) { | |
3016 return FAIL; // the previous store overlaps | |
3017 } | |
3018 } else { | |
3019 if (size_in_bytes != 0 && | |
3020 st->as_Store()->memory_size() != size_in_bytes) { | |
3021 return FAIL; // mismatched store size | |
3022 } | |
3023 return i; | |
3024 } | |
3025 | |
3026 ++i; | |
3027 } | |
3028 } | |
3029 | |
3030 // Look for a captured store which initializes at the offset 'start' | |
3031 // with the given size. If there is no such store, and no other | |
3032 // initialization interferes, then return zero_memory (the memory | |
3033 // projection of the AllocateNode). | |
3034 Node* InitializeNode::find_captured_store(intptr_t start, int size_in_bytes, | |
3035 PhaseTransform* phase) { | |
3036 assert(stores_are_sane(phase), ""); | |
3037 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
3038 if (i == 0) { | |
3039 return NULL; // something is dead | |
3040 } else if (i < 0) { | |
3041 return zero_memory(); // just primordial zero bits here | |
3042 } else { | |
3043 Node* st = in(i); // here is the store at this position | |
3044 assert(get_store_offset(st->as_Store(), phase) == start, "sanity"); | |
3045 return st; | |
3046 } | |
3047 } | |
3048 | |
3049 // Create, as a raw pointer, an address within my new object at 'offset'. | |
3050 Node* InitializeNode::make_raw_address(intptr_t offset, | |
3051 PhaseTransform* phase) { | |
3052 Node* addr = in(RawAddress); | |
3053 if (offset != 0) { | |
3054 Compile* C = phase->C; | |
3055 addr = phase->transform( new (C, 4) AddPNode(C->top(), addr, | |
3056 phase->MakeConX(offset)) ); | |
3057 } | |
3058 return addr; | |
3059 } | |
3060 | |
3061 // Clone the given store, converting it into a raw store | |
3062 // initializing a field or element of my new object. | |
3063 // Caller is responsible for retiring the original store, | |
3064 // with subsume_node or the like. | |
3065 // | |
3066 // From the example above InitializeNode::InitializeNode, | |
3067 // here are the old stores to be captured: | |
3068 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
3069 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
3070 // | |
3071 // Here is the changed code; note the extra edges on init: | |
3072 // alloc = (Allocate ...) | |
3073 // rawoop = alloc.RawAddress | |
3074 // rawstore1 = (StoreC alloc.Control alloc.Memory (+ rawoop 12) 1) | |
3075 // rawstore2 = (StoreC alloc.Control alloc.Memory (+ rawoop 14) 2) | |
3076 // init = (Initialize alloc.Control alloc.Memory rawoop | |
3077 // rawstore1 rawstore2) | |
3078 // | |
3079 Node* InitializeNode::capture_store(StoreNode* st, intptr_t start, | |
3080 PhaseTransform* phase) { | |
3081 assert(stores_are_sane(phase), ""); | |
3082 | |
3083 if (start < 0) return NULL; | |
3084 assert(can_capture_store(st, phase) == start, "sanity"); | |
3085 | |
3086 Compile* C = phase->C; | |
3087 int size_in_bytes = st->memory_size(); | |
3088 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
3089 if (i == 0) return NULL; // bail out | |
3090 Node* prev_mem = NULL; // raw memory for the captured store | |
3091 if (i > 0) { | |
3092 prev_mem = in(i); // there is a pre-existing store under this one | |
3093 set_req(i, C->top()); // temporarily disconnect it | |
3094 // See StoreNode::Ideal 'st->outcnt() == 1' for the reason to disconnect. | |
3095 } else { | |
3096 i = -i; // no pre-existing store | |
3097 prev_mem = zero_memory(); // a slice of the newly allocated object | |
3098 if (i > InitializeNode::RawStores && in(i-1) == prev_mem) | |
3099 set_req(--i, C->top()); // reuse this edge; it has been folded away | |
3100 else | |
3101 ins_req(i, C->top()); // build a new edge | |
3102 } | |
3103 Node* new_st = st->clone(); | |
3104 new_st->set_req(MemNode::Control, in(Control)); | |
3105 new_st->set_req(MemNode::Memory, prev_mem); | |
3106 new_st->set_req(MemNode::Address, make_raw_address(start, phase)); | |
3107 new_st = phase->transform(new_st); | |
3108 | |
3109 // At this point, new_st might have swallowed a pre-existing store | |
3110 // at the same offset, or perhaps new_st might have disappeared, | |
3111 // if it redundantly stored the same value (or zero to fresh memory). | |
3112 | |
3113 // In any case, wire it in: | |
3114 set_req(i, new_st); | |
3115 | |
3116 // The caller may now kill the old guy. | |
3117 DEBUG_ONLY(Node* check_st = find_captured_store(start, size_in_bytes, phase)); | |
3118 assert(check_st == new_st || check_st == NULL, "must be findable"); | |
3119 assert(!is_complete(), ""); | |
3120 return new_st; | |
3121 } | |
3122 | |
3123 static bool store_constant(jlong* tiles, int num_tiles, | |
3124 intptr_t st_off, int st_size, | |
3125 jlong con) { | |
3126 if ((st_off & (st_size-1)) != 0) | |
3127 return false; // strange store offset (assume size==2**N) | |
3128 address addr = (address)tiles + st_off; | |
3129 assert(st_off >= 0 && addr+st_size <= (address)&tiles[num_tiles], "oob"); | |
3130 switch (st_size) { | |
3131 case sizeof(jbyte): *(jbyte*) addr = (jbyte) con; break; | |
3132 case sizeof(jchar): *(jchar*) addr = (jchar) con; break; | |
3133 case sizeof(jint): *(jint*) addr = (jint) con; break; | |
3134 case sizeof(jlong): *(jlong*) addr = (jlong) con; break; | |
3135 default: return false; // strange store size (detect size!=2**N here) | |
3136 } | |
3137 return true; // return success to caller | |
3138 } | |
3139 | |
3140 // Coalesce subword constants into int constants and possibly | |
3141 // into long constants. The goal, if the CPU permits, | |
3142 // is to initialize the object with a small number of 64-bit tiles. | |
3143 // Also, convert floating-point constants to bit patterns. | |
3144 // Non-constants are not relevant to this pass. | |
3145 // | |
3146 // In terms of the running example on InitializeNode::InitializeNode | |
3147 // and InitializeNode::capture_store, here is the transformation | |
3148 // of rawstore1 and rawstore2 into rawstore12: | |
3149 // alloc = (Allocate ...) | |
3150 // rawoop = alloc.RawAddress | |
3151 // tile12 = 0x00010002 | |
3152 // rawstore12 = (StoreI alloc.Control alloc.Memory (+ rawoop 12) tile12) | |
3153 // init = (Initialize alloc.Control alloc.Memory rawoop rawstore12) | |
3154 // | |
3155 void | |
3156 InitializeNode::coalesce_subword_stores(intptr_t header_size, | |
3157 Node* size_in_bytes, | |
3158 PhaseGVN* phase) { | |
3159 Compile* C = phase->C; | |
3160 | |
3161 assert(stores_are_sane(phase), ""); | |
3162 // Note: After this pass, they are not completely sane, | |
3163 // since there may be some overlaps. | |
3164 | |
3165 int old_subword = 0, old_long = 0, new_int = 0, new_long = 0; | |
3166 | |
3167 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
3168 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, ti_limit); | |
3169 size_limit = MIN2(size_limit, ti_limit); | |
3170 size_limit = align_size_up(size_limit, BytesPerLong); | |
3171 int num_tiles = size_limit / BytesPerLong; | |
3172 | |
3173 // allocate space for the tile map: | |
3174 const int small_len = DEBUG_ONLY(true ? 3 :) 30; // keep stack frames small | |
3175 jlong tiles_buf[small_len]; | |
3176 Node* nodes_buf[small_len]; | |
3177 jlong inits_buf[small_len]; | |
3178 jlong* tiles = ((num_tiles <= small_len) ? &tiles_buf[0] | |
3179 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
3180 Node** nodes = ((num_tiles <= small_len) ? &nodes_buf[0] | |
3181 : NEW_RESOURCE_ARRAY(Node*, num_tiles)); | |
3182 jlong* inits = ((num_tiles <= small_len) ? &inits_buf[0] | |
3183 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
3184 // tiles: exact bitwise model of all primitive constants | |
3185 // nodes: last constant-storing node subsumed into the tiles model | |
3186 // inits: which bytes (in each tile) are touched by any initializations | |
3187 | |
3188 //// Pass A: Fill in the tile model with any relevant stores. | |
3189 | |
3190 Copy::zero_to_bytes(tiles, sizeof(tiles[0]) * num_tiles); | |
3191 Copy::zero_to_bytes(nodes, sizeof(nodes[0]) * num_tiles); | |
3192 Copy::zero_to_bytes(inits, sizeof(inits[0]) * num_tiles); | |
3193 Node* zmem = zero_memory(); // initially zero memory state | |
3194 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3195 Node* st = in(i); | |
3196 intptr_t st_off = get_store_offset(st, phase); | |
3197 | |
3198 // Figure out the store's offset and constant value: | |
3199 if (st_off < header_size) continue; //skip (ignore header) | |
3200 if (st->in(MemNode::Memory) != zmem) continue; //skip (odd store chain) | |
3201 int st_size = st->as_Store()->memory_size(); | |
3202 if (st_off + st_size > size_limit) break; | |
3203 | |
3204 // Record which bytes are touched, whether by constant or not. | |
3205 if (!store_constant(inits, num_tiles, st_off, st_size, (jlong) -1)) | |
3206 continue; // skip (strange store size) | |
3207 | |
3208 const Type* val = phase->type(st->in(MemNode::ValueIn)); | |
3209 if (!val->singleton()) continue; //skip (non-con store) | |
3210 BasicType type = val->basic_type(); | |
3211 | |
3212 jlong con = 0; | |
3213 switch (type) { | |
3214 case T_INT: con = val->is_int()->get_con(); break; | |
3215 case T_LONG: con = val->is_long()->get_con(); break; | |
3216 case T_FLOAT: con = jint_cast(val->getf()); break; | |
3217 case T_DOUBLE: con = jlong_cast(val->getd()); break; | |
3218 default: continue; //skip (odd store type) | |
3219 } | |
3220 | |
3221 if (type == T_LONG && Matcher::isSimpleConstant64(con) && | |
3222 st->Opcode() == Op_StoreL) { | |
3223 continue; // This StoreL is already optimal. | |
3224 } | |
3225 | |
3226 // Store down the constant. | |
3227 store_constant(tiles, num_tiles, st_off, st_size, con); | |
3228 | |
3229 intptr_t j = st_off >> LogBytesPerLong; | |
3230 | |
3231 if (type == T_INT && st_size == BytesPerInt | |
3232 && (st_off & BytesPerInt) == BytesPerInt) { | |
3233 jlong lcon = tiles[j]; | |
3234 if (!Matcher::isSimpleConstant64(lcon) && | |
3235 st->Opcode() == Op_StoreI) { | |
3236 // This StoreI is already optimal by itself. | |
3237 jint* intcon = (jint*) &tiles[j]; | |
3238 intcon[1] = 0; // undo the store_constant() | |
3239 | |
3240 // If the previous store is also optimal by itself, back up and | |
3241 // undo the action of the previous loop iteration... if we can. | |
3242 // But if we can't, just let the previous half take care of itself. | |
3243 st = nodes[j]; | |
3244 st_off -= BytesPerInt; | |
3245 con = intcon[0]; | |
3246 if (con != 0 && st != NULL && st->Opcode() == Op_StoreI) { | |
3247 assert(st_off >= header_size, "still ignoring header"); | |
3248 assert(get_store_offset(st, phase) == st_off, "must be"); | |
3249 assert(in(i-1) == zmem, "must be"); | |
3250 DEBUG_ONLY(const Type* tcon = phase->type(st->in(MemNode::ValueIn))); | |
3251 assert(con == tcon->is_int()->get_con(), "must be"); | |
3252 // Undo the effects of the previous loop trip, which swallowed st: | |
3253 intcon[0] = 0; // undo store_constant() | |
3254 set_req(i-1, st); // undo set_req(i, zmem) | |
3255 nodes[j] = NULL; // undo nodes[j] = st | |
3256 --old_subword; // undo ++old_subword | |
3257 } | |
3258 continue; // This StoreI is already optimal. | |
3259 } | |
3260 } | |
3261 | |
3262 // This store is not needed. | |
3263 set_req(i, zmem); | |
3264 nodes[j] = st; // record for the moment | |
3265 if (st_size < BytesPerLong) // something has changed | |
3266 ++old_subword; // includes int/float, but who's counting... | |
3267 else ++old_long; | |
3268 } | |
3269 | |
3270 if ((old_subword + old_long) == 0) | |
3271 return; // nothing more to do | |
3272 | |
3273 //// Pass B: Convert any non-zero tiles into optimal constant stores. | |
3274 // Be sure to insert them before overlapping non-constant stores. | |
3275 // (E.g., byte[] x = { 1,2,y,4 } => x[int 0] = 0x01020004, x[2]=y.) | |
3276 for (int j = 0; j < num_tiles; j++) { | |
3277 jlong con = tiles[j]; | |
3278 jlong init = inits[j]; | |
3279 if (con == 0) continue; | |
3280 jint con0, con1; // split the constant, address-wise | |
3281 jint init0, init1; // split the init map, address-wise | |
3282 { union { jlong con; jint intcon[2]; } u; | |
3283 u.con = con; | |
3284 con0 = u.intcon[0]; | |
3285 con1 = u.intcon[1]; | |
3286 u.con = init; | |
3287 init0 = u.intcon[0]; | |
3288 init1 = u.intcon[1]; | |
3289 } | |
3290 | |
3291 Node* old = nodes[j]; | |
3292 assert(old != NULL, "need the prior store"); | |
3293 intptr_t offset = (j * BytesPerLong); | |
3294 | |
3295 bool split = !Matcher::isSimpleConstant64(con); | |
3296 | |
3297 if (offset < header_size) { | |
3298 assert(offset + BytesPerInt >= header_size, "second int counts"); | |
3299 assert(*(jint*)&tiles[j] == 0, "junk in header"); | |
3300 split = true; // only the second word counts | |
3301 // Example: int a[] = { 42 ... } | |
3302 } else if (con0 == 0 && init0 == -1) { | |
3303 split = true; // first word is covered by full inits | |
3304 // Example: int a[] = { ... foo(), 42 ... } | |
3305 } else if (con1 == 0 && init1 == -1) { | |
3306 split = true; // second word is covered by full inits | |
3307 // Example: int a[] = { ... 42, foo() ... } | |
3308 } | |
3309 | |
3310 // Here's a case where init0 is neither 0 nor -1: | |
3311 // byte a[] = { ... 0,0,foo(),0, 0,0,0,42 ... } | |
3312 // Assuming big-endian memory, init0, init1 are 0x0000FF00, 0x000000FF. | |
3313 // In this case the tile is not split; it is (jlong)42. | |
3314 // The big tile is stored down, and then the foo() value is inserted. | |
3315 // (If there were foo(),foo() instead of foo(),0, init0 would be -1.) | |
3316 | |
3317 Node* ctl = old->in(MemNode::Control); | |
3318 Node* adr = make_raw_address(offset, phase); | |
3319 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
3320 | |
3321 // One or two coalesced stores to plop down. | |
3322 Node* st[2]; | |
3323 intptr_t off[2]; | |
3324 int nst = 0; | |
3325 if (!split) { | |
3326 ++new_long; | |
3327 off[nst] = offset; | |
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3328 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3329 phase->longcon(con), T_LONG); |
3330 } else { | |
3331 // Omit either if it is a zero. | |
3332 if (con0 != 0) { | |
3333 ++new_int; | |
3334 off[nst] = offset; | |
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3335 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3336 phase->intcon(con0), T_INT); |
3337 } | |
3338 if (con1 != 0) { | |
3339 ++new_int; | |
3340 offset += BytesPerInt; | |
3341 adr = make_raw_address(offset, phase); | |
3342 off[nst] = offset; | |
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3343 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3344 phase->intcon(con1), T_INT); |
3345 } | |
3346 } | |
3347 | |
3348 // Insert second store first, then the first before the second. | |
3349 // Insert each one just before any overlapping non-constant stores. | |
3350 while (nst > 0) { | |
3351 Node* st1 = st[--nst]; | |
3352 C->copy_node_notes_to(st1, old); | |
3353 st1 = phase->transform(st1); | |
3354 offset = off[nst]; | |
3355 assert(offset >= header_size, "do not smash header"); | |
3356 int ins_idx = captured_store_insertion_point(offset, /*size:*/0, phase); | |
3357 guarantee(ins_idx != 0, "must re-insert constant store"); | |
3358 if (ins_idx < 0) ins_idx = -ins_idx; // never overlap | |
3359 if (ins_idx > InitializeNode::RawStores && in(ins_idx-1) == zmem) | |
3360 set_req(--ins_idx, st1); | |
3361 else | |
3362 ins_req(ins_idx, st1); | |
3363 } | |
3364 } | |
3365 | |
3366 if (PrintCompilation && WizardMode) | |
3367 tty->print_cr("Changed %d/%d subword/long constants into %d/%d int/long", | |
3368 old_subword, old_long, new_int, new_long); | |
3369 if (C->log() != NULL) | |
3370 C->log()->elem("comment that='%d/%d subword/long to %d/%d int/long'", | |
3371 old_subword, old_long, new_int, new_long); | |
3372 | |
3373 // Clean up any remaining occurrences of zmem: | |
3374 remove_extra_zeroes(); | |
3375 } | |
3376 | |
3377 // Explore forward from in(start) to find the first fully initialized | |
3378 // word, and return its offset. Skip groups of subword stores which | |
3379 // together initialize full words. If in(start) is itself part of a | |
3380 // fully initialized word, return the offset of in(start). If there | |
3381 // are no following full-word stores, or if something is fishy, return | |
3382 // a negative value. | |
3383 intptr_t InitializeNode::find_next_fullword_store(uint start, PhaseGVN* phase) { | |
3384 int int_map = 0; | |
3385 intptr_t int_map_off = 0; | |
3386 const int FULL_MAP = right_n_bits(BytesPerInt); // the int_map we hope for | |
3387 | |
3388 for (uint i = start, limit = req(); i < limit; i++) { | |
3389 Node* st = in(i); | |
3390 | |
3391 intptr_t st_off = get_store_offset(st, phase); | |
3392 if (st_off < 0) break; // return conservative answer | |
3393 | |
3394 int st_size = st->as_Store()->memory_size(); | |
3395 if (st_size >= BytesPerInt && (st_off % BytesPerInt) == 0) { | |
3396 return st_off; // we found a complete word init | |
3397 } | |
3398 | |
3399 // update the map: | |
3400 | |
3401 intptr_t this_int_off = align_size_down(st_off, BytesPerInt); | |
3402 if (this_int_off != int_map_off) { | |
3403 // reset the map: | |
3404 int_map = 0; | |
3405 int_map_off = this_int_off; | |
3406 } | |
3407 | |
3408 int subword_off = st_off - this_int_off; | |
3409 int_map |= right_n_bits(st_size) << subword_off; | |
3410 if ((int_map & FULL_MAP) == FULL_MAP) { | |
3411 return this_int_off; // we found a complete word init | |
3412 } | |
3413 | |
3414 // Did this store hit or cross the word boundary? | |
3415 intptr_t next_int_off = align_size_down(st_off + st_size, BytesPerInt); | |
3416 if (next_int_off == this_int_off + BytesPerInt) { | |
3417 // We passed the current int, without fully initializing it. | |
3418 int_map_off = next_int_off; | |
3419 int_map >>= BytesPerInt; | |
3420 } else if (next_int_off > this_int_off + BytesPerInt) { | |
3421 // We passed the current and next int. | |
3422 return this_int_off + BytesPerInt; | |
3423 } | |
3424 } | |
3425 | |
3426 return -1; | |
3427 } | |
3428 | |
3429 | |
3430 // Called when the associated AllocateNode is expanded into CFG. | |
3431 // At this point, we may perform additional optimizations. | |
3432 // Linearize the stores by ascending offset, to make memory | |
3433 // activity as coherent as possible. | |
3434 Node* InitializeNode::complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
3435 intptr_t header_size, | |
3436 Node* size_in_bytes, | |
3437 PhaseGVN* phase) { | |
3438 assert(!is_complete(), "not already complete"); | |
3439 assert(stores_are_sane(phase), ""); | |
3440 assert(allocation() != NULL, "must be present"); | |
3441 | |
3442 remove_extra_zeroes(); | |
3443 | |
3444 if (ReduceFieldZeroing || ReduceBulkZeroing) | |
3445 // reduce instruction count for common initialization patterns | |
3446 coalesce_subword_stores(header_size, size_in_bytes, phase); | |
3447 | |
3448 Node* zmem = zero_memory(); // initially zero memory state | |
3449 Node* inits = zmem; // accumulating a linearized chain of inits | |
3450 #ifdef ASSERT | |
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3451 intptr_t first_offset = allocation()->minimum_header_size(); |
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3452 intptr_t last_init_off = first_offset; // previous init offset |
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3453 intptr_t last_init_end = first_offset; // previous init offset+size |
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3454 intptr_t last_tile_end = first_offset; // previous tile offset+size |
0 | 3455 #endif |
3456 intptr_t zeroes_done = header_size; | |
3457 | |
3458 bool do_zeroing = true; // we might give up if inits are very sparse | |
3459 int big_init_gaps = 0; // how many large gaps have we seen? | |
3460 | |
3461 if (ZeroTLAB) do_zeroing = false; | |
3462 if (!ReduceFieldZeroing && !ReduceBulkZeroing) do_zeroing = false; | |
3463 | |
3464 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3465 Node* st = in(i); | |
3466 intptr_t st_off = get_store_offset(st, phase); | |
3467 if (st_off < 0) | |
3468 break; // unknown junk in the inits | |
3469 if (st->in(MemNode::Memory) != zmem) | |
3470 break; // complicated store chains somehow in list | |
3471 | |
3472 int st_size = st->as_Store()->memory_size(); | |
3473 intptr_t next_init_off = st_off + st_size; | |
3474 | |
3475 if (do_zeroing && zeroes_done < next_init_off) { | |
3476 // See if this store needs a zero before it or under it. | |
3477 intptr_t zeroes_needed = st_off; | |
3478 | |
3479 if (st_size < BytesPerInt) { | |
3480 // Look for subword stores which only partially initialize words. | |
3481 // If we find some, we must lay down some word-level zeroes first, | |
3482 // underneath the subword stores. | |
3483 // | |
3484 // Examples: | |
3485 // byte[] a = { p,q,r,s } => a[0]=p,a[1]=q,a[2]=r,a[3]=s | |
3486 // byte[] a = { x,y,0,0 } => a[0..3] = 0, a[0]=x,a[1]=y | |
3487 // byte[] a = { 0,0,z,0 } => a[0..3] = 0, a[2]=z | |
3488 // | |
3489 // Note: coalesce_subword_stores may have already done this, | |
3490 // if it was prompted by constant non-zero subword initializers. | |
3491 // But this case can still arise with non-constant stores. | |
3492 | |
3493 intptr_t next_full_store = find_next_fullword_store(i, phase); | |
3494 | |
3495 // In the examples above: | |
3496 // in(i) p q r s x y z | |
3497 // st_off 12 13 14 15 12 13 14 | |
3498 // st_size 1 1 1 1 1 1 1 | |
3499 // next_full_s. 12 16 16 16 16 16 16 | |
3500 // z's_done 12 16 16 16 12 16 12 | |
3501 // z's_needed 12 16 16 16 16 16 16 | |
3502 // zsize 0 0 0 0 4 0 4 | |
3503 if (next_full_store < 0) { | |
3504 // Conservative tack: Zero to end of current word. | |
3505 zeroes_needed = align_size_up(zeroes_needed, BytesPerInt); | |
3506 } else { | |
3507 // Zero to beginning of next fully initialized word. | |
3508 // Or, don't zero at all, if we are already in that word. | |
3509 assert(next_full_store >= zeroes_needed, "must go forward"); | |
3510 assert((next_full_store & (BytesPerInt-1)) == 0, "even boundary"); | |
3511 zeroes_needed = next_full_store; | |
3512 } | |
3513 } | |
3514 | |
3515 if (zeroes_needed > zeroes_done) { | |
3516 intptr_t zsize = zeroes_needed - zeroes_done; | |
3517 // Do some incremental zeroing on rawmem, in parallel with inits. | |
3518 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3519 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3520 zeroes_done, zeroes_needed, | |
3521 phase); | |
3522 zeroes_done = zeroes_needed; | |
3523 if (zsize > Matcher::init_array_short_size && ++big_init_gaps > 2) | |
3524 do_zeroing = false; // leave the hole, next time | |
3525 } | |
3526 } | |
3527 | |
3528 // Collect the store and move on: | |
3529 st->set_req(MemNode::Memory, inits); | |
3530 inits = st; // put it on the linearized chain | |
3531 set_req(i, zmem); // unhook from previous position | |
3532 | |
3533 if (zeroes_done == st_off) | |
3534 zeroes_done = next_init_off; | |
3535 | |
3536 assert(!do_zeroing || zeroes_done >= next_init_off, "don't miss any"); | |
3537 | |
3538 #ifdef ASSERT | |
3539 // Various order invariants. Weaker than stores_are_sane because | |
3540 // a large constant tile can be filled in by smaller non-constant stores. | |
3541 assert(st_off >= last_init_off, "inits do not reverse"); | |
3542 last_init_off = st_off; | |
3543 const Type* val = NULL; | |
3544 if (st_size >= BytesPerInt && | |
3545 (val = phase->type(st->in(MemNode::ValueIn)))->singleton() && | |
3546 (int)val->basic_type() < (int)T_OBJECT) { | |
3547 assert(st_off >= last_tile_end, "tiles do not overlap"); | |
3548 assert(st_off >= last_init_end, "tiles do not overwrite inits"); | |
3549 last_tile_end = MAX2(last_tile_end, next_init_off); | |
3550 } else { | |
3551 intptr_t st_tile_end = align_size_up(next_init_off, BytesPerLong); | |
3552 assert(st_tile_end >= last_tile_end, "inits stay with tiles"); | |
3553 assert(st_off >= last_init_end, "inits do not overlap"); | |
3554 last_init_end = next_init_off; // it's a non-tile | |
3555 } | |
3556 #endif //ASSERT | |
3557 } | |
3558 | |
3559 remove_extra_zeroes(); // clear out all the zmems left over | |
3560 add_req(inits); | |
3561 | |
3562 if (!ZeroTLAB) { | |
3563 // If anything remains to be zeroed, zero it all now. | |
3564 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3565 // if it is the last unused 4 bytes of an instance, forget about it | |
3566 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint); | |
3567 if (zeroes_done + BytesPerLong >= size_limit) { | |
3568 assert(allocation() != NULL, ""); | |
3569 Node* klass_node = allocation()->in(AllocateNode::KlassNode); | |
3570 ciKlass* k = phase->type(klass_node)->is_klassptr()->klass(); | |
3571 if (zeroes_done == k->layout_helper()) | |
3572 zeroes_done = size_limit; | |
3573 } | |
3574 if (zeroes_done < size_limit) { | |
3575 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3576 zeroes_done, size_in_bytes, phase); | |
3577 } | |
3578 } | |
3579 | |
3580 set_complete(phase); | |
3581 return rawmem; | |
3582 } | |
3583 | |
3584 | |
3585 #ifdef ASSERT | |
3586 bool InitializeNode::stores_are_sane(PhaseTransform* phase) { | |
3587 if (is_complete()) | |
3588 return true; // stores could be anything at this point | |
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3589 assert(allocation() != NULL, "must be present"); |
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3590 intptr_t last_off = allocation()->minimum_header_size(); |
0 | 3591 for (uint i = InitializeNode::RawStores; i < req(); i++) { |
3592 Node* st = in(i); | |
3593 intptr_t st_off = get_store_offset(st, phase); | |
3594 if (st_off < 0) continue; // ignore dead garbage | |
3595 if (last_off > st_off) { | |
3596 tty->print_cr("*** bad store offset at %d: %d > %d", i, last_off, st_off); | |
3597 this->dump(2); | |
3598 assert(false, "ascending store offsets"); | |
3599 return false; | |
3600 } | |
3601 last_off = st_off + st->as_Store()->memory_size(); | |
3602 } | |
3603 return true; | |
3604 } | |
3605 #endif //ASSERT | |
3606 | |
3607 | |
3608 | |
3609 | |
3610 //============================MergeMemNode===================================== | |
3611 // | |
3612 // SEMANTICS OF MEMORY MERGES: A MergeMem is a memory state assembled from several | |
3613 // contributing store or call operations. Each contributor provides the memory | |
3614 // state for a particular "alias type" (see Compile::alias_type). For example, | |
3615 // if a MergeMem has an input X for alias category #6, then any memory reference | |
3616 // to alias category #6 may use X as its memory state input, as an exact equivalent | |
3617 // to using the MergeMem as a whole. | |
3618 // Load<6>( MergeMem(<6>: X, ...), p ) <==> Load<6>(X,p) | |
3619 // | |
3620 // (Here, the <N> notation gives the index of the relevant adr_type.) | |
3621 // | |
3622 // In one special case (and more cases in the future), alias categories overlap. | |
3623 // The special alias category "Bot" (Compile::AliasIdxBot) includes all memory | |
3624 // states. Therefore, if a MergeMem has only one contributing input W for Bot, | |
3625 // it is exactly equivalent to that state W: | |
3626 // MergeMem(<Bot>: W) <==> W | |
3627 // | |
3628 // Usually, the merge has more than one input. In that case, where inputs | |
3629 // overlap (i.e., one is Bot), the narrower alias type determines the memory | |
3630 // state for that type, and the wider alias type (Bot) fills in everywhere else: | |
3631 // Load<5>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<5>(W,p) | |
3632 // Load<6>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<6>(X,p) | |
3633 // | |
3634 // A merge can take a "wide" memory state as one of its narrow inputs. | |
3635 // This simply means that the merge observes out only the relevant parts of | |
3636 // the wide input. That is, wide memory states arriving at narrow merge inputs | |
3637 // are implicitly "filtered" or "sliced" as necessary. (This is rare.) | |
3638 // | |
3639 // These rules imply that MergeMem nodes may cascade (via their <Bot> links), | |
3640 // and that memory slices "leak through": | |
3641 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y)) <==> MergeMem(<Bot>: W, <7>: Y) | |
3642 // | |
3643 // But, in such a cascade, repeated memory slices can "block the leak": | |
3644 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y), <7>: Y') <==> MergeMem(<Bot>: W, <7>: Y') | |
3645 // | |
3646 // In the last example, Y is not part of the combined memory state of the | |
3647 // outermost MergeMem. The system must, of course, prevent unschedulable | |
3648 // memory states from arising, so you can be sure that the state Y is somehow | |
3649 // a precursor to state Y'. | |
3650 // | |
3651 // | |
3652 // REPRESENTATION OF MEMORY MERGES: The indexes used to address the Node::in array | |
3653 // of each MergeMemNode array are exactly the numerical alias indexes, including | |
3654 // but not limited to AliasIdxTop, AliasIdxBot, and AliasIdxRaw. The functions | |
3655 // Compile::alias_type (and kin) produce and manage these indexes. | |
3656 // | |
3657 // By convention, the value of in(AliasIdxTop) (i.e., in(1)) is always the top node. | |
3658 // (Note that this provides quick access to the top node inside MergeMem methods, | |
3659 // without the need to reach out via TLS to Compile::current.) | |
3660 // | |
3661 // As a consequence of what was just described, a MergeMem that represents a full | |
3662 // memory state has an edge in(AliasIdxBot) which is a "wide" memory state, | |
3663 // containing all alias categories. | |
3664 // | |
3665 // MergeMem nodes never (?) have control inputs, so in(0) is NULL. | |
3666 // | |
3667 // All other edges in(N) (including in(AliasIdxRaw), which is in(3)) are either | |
3668 // a memory state for the alias type <N>, or else the top node, meaning that | |
3669 // there is no particular input for that alias type. Note that the length of | |
3670 // a MergeMem is variable, and may be extended at any time to accommodate new | |
3671 // memory states at larger alias indexes. When merges grow, they are of course | |
3672 // filled with "top" in the unused in() positions. | |
3673 // | |
3674 // This use of top is named "empty_memory()", or "empty_mem" (no-memory) as a variable. | |
3675 // (Top was chosen because it works smoothly with passes like GCM.) | |
3676 // | |
3677 // For convenience, we hardwire the alias index for TypeRawPtr::BOTTOM. (It is | |
3678 // the type of random VM bits like TLS references.) Since it is always the | |
3679 // first non-Bot memory slice, some low-level loops use it to initialize an | |
3680 // index variable: for (i = AliasIdxRaw; i < req(); i++). | |
3681 // | |
3682 // | |
3683 // ACCESSORS: There is a special accessor MergeMemNode::base_memory which returns | |
3684 // the distinguished "wide" state. The accessor MergeMemNode::memory_at(N) returns | |
3685 // the memory state for alias type <N>, or (if there is no particular slice at <N>, | |
3686 // it returns the base memory. To prevent bugs, memory_at does not accept <Top> | |
3687 // or <Bot> indexes. The iterator MergeMemStream provides robust iteration over | |
3688 // MergeMem nodes or pairs of such nodes, ensuring that the non-top edges are visited. | |
3689 // | |
3690 // %%%% We may get rid of base_memory as a separate accessor at some point; it isn't | |
3691 // really that different from the other memory inputs. An abbreviation called | |
3692 // "bot_memory()" for "memory_at(AliasIdxBot)" would keep code tidy. | |
3693 // | |
3694 // | |
3695 // PARTIAL MEMORY STATES: During optimization, MergeMem nodes may arise that represent | |
3696 // partial memory states. When a Phi splits through a MergeMem, the copy of the Phi | |
3697 // that "emerges though" the base memory will be marked as excluding the alias types | |
3698 // of the other (narrow-memory) copies which "emerged through" the narrow edges: | |
3699 // | |
3700 // Phi<Bot>(U, MergeMem(<Bot>: W, <8>: Y)) | |
3701 // ==Ideal=> MergeMem(<Bot>: Phi<Bot-8>(U, W), Phi<8>(U, Y)) | |
3702 // | |
3703 // This strange "subtraction" effect is necessary to ensure IGVN convergence. | |
3704 // (It is currently unimplemented.) As you can see, the resulting merge is | |
3705 // actually a disjoint union of memory states, rather than an overlay. | |
3706 // | |
3707 | |
3708 //------------------------------MergeMemNode----------------------------------- | |
3709 Node* MergeMemNode::make_empty_memory() { | |
3710 Node* empty_memory = (Node*) Compile::current()->top(); | |
3711 assert(empty_memory->is_top(), "correct sentinel identity"); | |
3712 return empty_memory; | |
3713 } | |
3714 | |
3715 MergeMemNode::MergeMemNode(Node *new_base) : Node(1+Compile::AliasIdxRaw) { | |
3716 init_class_id(Class_MergeMem); | |
3717 // all inputs are nullified in Node::Node(int) | |
3718 // set_input(0, NULL); // no control input | |
3719 | |
3720 // Initialize the edges uniformly to top, for starters. | |
3721 Node* empty_mem = make_empty_memory(); | |
3722 for (uint i = Compile::AliasIdxTop; i < req(); i++) { | |
3723 init_req(i,empty_mem); | |
3724 } | |
3725 assert(empty_memory() == empty_mem, ""); | |
3726 | |
3727 if( new_base != NULL && new_base->is_MergeMem() ) { | |
3728 MergeMemNode* mdef = new_base->as_MergeMem(); | |
3729 assert(mdef->empty_memory() == empty_mem, "consistent sentinels"); | |
3730 for (MergeMemStream mms(this, mdef); mms.next_non_empty2(); ) { | |
3731 mms.set_memory(mms.memory2()); | |
3732 } | |
3733 assert(base_memory() == mdef->base_memory(), ""); | |
3734 } else { | |
3735 set_base_memory(new_base); | |
3736 } | |
3737 } | |
3738 | |
3739 // Make a new, untransformed MergeMem with the same base as 'mem'. | |
3740 // If mem is itself a MergeMem, populate the result with the same edges. | |
3741 MergeMemNode* MergeMemNode::make(Compile* C, Node* mem) { | |
3742 return new(C, 1+Compile::AliasIdxRaw) MergeMemNode(mem); | |
3743 } | |
3744 | |
3745 //------------------------------cmp-------------------------------------------- | |
3746 uint MergeMemNode::hash() const { return NO_HASH; } | |
3747 uint MergeMemNode::cmp( const Node &n ) const { | |
3748 return (&n == this); // Always fail except on self | |
3749 } | |
3750 | |
3751 //------------------------------Identity--------------------------------------- | |
3752 Node* MergeMemNode::Identity(PhaseTransform *phase) { | |
3753 // Identity if this merge point does not record any interesting memory | |
3754 // disambiguations. | |
3755 Node* base_mem = base_memory(); | |
3756 Node* empty_mem = empty_memory(); | |
3757 if (base_mem != empty_mem) { // Memory path is not dead? | |
3758 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3759 Node* mem = in(i); | |
3760 if (mem != empty_mem && mem != base_mem) { | |
3761 return this; // Many memory splits; no change | |
3762 } | |
3763 } | |
3764 } | |
3765 return base_mem; // No memory splits; ID on the one true input | |
3766 } | |
3767 | |
3768 //------------------------------Ideal------------------------------------------ | |
3769 // This method is invoked recursively on chains of MergeMem nodes | |
3770 Node *MergeMemNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
3771 // Remove chain'd MergeMems | |
3772 // | |
3773 // This is delicate, because the each "in(i)" (i >= Raw) is interpreted | |
3774 // relative to the "in(Bot)". Since we are patching both at the same time, | |
3775 // we have to be careful to read each "in(i)" relative to the old "in(Bot)", | |
3776 // but rewrite each "in(i)" relative to the new "in(Bot)". | |
3777 Node *progress = NULL; | |
3778 | |
3779 | |
3780 Node* old_base = base_memory(); | |
3781 Node* empty_mem = empty_memory(); | |
3782 if (old_base == empty_mem) | |
3783 return NULL; // Dead memory path. | |
3784 | |
3785 MergeMemNode* old_mbase; | |
3786 if (old_base != NULL && old_base->is_MergeMem()) | |
3787 old_mbase = old_base->as_MergeMem(); | |
3788 else | |
3789 old_mbase = NULL; | |
3790 Node* new_base = old_base; | |
3791 | |
3792 // simplify stacked MergeMems in base memory | |
3793 if (old_mbase) new_base = old_mbase->base_memory(); | |
3794 | |
3795 // the base memory might contribute new slices beyond my req() | |
3796 if (old_mbase) grow_to_match(old_mbase); | |
3797 | |
3798 // Look carefully at the base node if it is a phi. | |
3799 PhiNode* phi_base; | |
3800 if (new_base != NULL && new_base->is_Phi()) | |
3801 phi_base = new_base->as_Phi(); | |
3802 else | |
3803 phi_base = NULL; | |
3804 | |
3805 Node* phi_reg = NULL; | |
3806 uint phi_len = (uint)-1; | |
3807 if (phi_base != NULL && !phi_base->is_copy()) { | |
3808 // do not examine phi if degraded to a copy | |
3809 phi_reg = phi_base->region(); | |
3810 phi_len = phi_base->req(); | |
3811 // see if the phi is unfinished | |
3812 for (uint i = 1; i < phi_len; i++) { | |
3813 if (phi_base->in(i) == NULL) { | |
3814 // incomplete phi; do not look at it yet! | |
3815 phi_reg = NULL; | |
3816 phi_len = (uint)-1; | |
3817 break; | |
3818 } | |
3819 } | |
3820 } | |
3821 | |
3822 // Note: We do not call verify_sparse on entry, because inputs | |
3823 // can normalize to the base_memory via subsume_node or similar | |
3824 // mechanisms. This method repairs that damage. | |
3825 | |
3826 assert(!old_mbase || old_mbase->is_empty_memory(empty_mem), "consistent sentinels"); | |
3827 | |
3828 // Look at each slice. | |
3829 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3830 Node* old_in = in(i); | |
3831 // calculate the old memory value | |
3832 Node* old_mem = old_in; | |
3833 if (old_mem == empty_mem) old_mem = old_base; | |
3834 assert(old_mem == memory_at(i), ""); | |
3835 | |
3836 // maybe update (reslice) the old memory value | |
3837 | |
3838 // simplify stacked MergeMems | |
3839 Node* new_mem = old_mem; | |
3840 MergeMemNode* old_mmem; | |
3841 if (old_mem != NULL && old_mem->is_MergeMem()) | |
3842 old_mmem = old_mem->as_MergeMem(); | |
3843 else | |
3844 old_mmem = NULL; | |
3845 if (old_mmem == this) { | |
3846 // This can happen if loops break up and safepoints disappear. | |
3847 // A merge of BotPtr (default) with a RawPtr memory derived from a | |
3848 // safepoint can be rewritten to a merge of the same BotPtr with | |
3849 // the BotPtr phi coming into the loop. If that phi disappears | |
3850 // also, we can end up with a self-loop of the mergemem. | |
3851 // In general, if loops degenerate and memory effects disappear, | |
3852 // a mergemem can be left looking at itself. This simply means | |
3853 // that the mergemem's default should be used, since there is | |
3854 // no longer any apparent effect on this slice. | |
3855 // Note: If a memory slice is a MergeMem cycle, it is unreachable | |
3856 // from start. Update the input to TOP. | |
3857 new_mem = (new_base == this || new_base == empty_mem)? empty_mem : new_base; | |
3858 } | |
3859 else if (old_mmem != NULL) { | |
3860 new_mem = old_mmem->memory_at(i); | |
3861 } | |
605 | 3862 // else preceding memory was not a MergeMem |
0 | 3863 |
3864 // replace equivalent phis (unfortunately, they do not GVN together) | |
3865 if (new_mem != NULL && new_mem != new_base && | |
3866 new_mem->req() == phi_len && new_mem->in(0) == phi_reg) { | |
3867 if (new_mem->is_Phi()) { | |
3868 PhiNode* phi_mem = new_mem->as_Phi(); | |
3869 for (uint i = 1; i < phi_len; i++) { | |
3870 if (phi_base->in(i) != phi_mem->in(i)) { | |
3871 phi_mem = NULL; | |
3872 break; | |
3873 } | |
3874 } | |
3875 if (phi_mem != NULL) { | |
3876 // equivalent phi nodes; revert to the def | |
3877 new_mem = new_base; | |
3878 } | |
3879 } | |
3880 } | |
3881 | |
3882 // maybe store down a new value | |
3883 Node* new_in = new_mem; | |
3884 if (new_in == new_base) new_in = empty_mem; | |
3885 | |
3886 if (new_in != old_in) { | |
3887 // Warning: Do not combine this "if" with the previous "if" | |
3888 // A memory slice might have be be rewritten even if it is semantically | |
3889 // unchanged, if the base_memory value has changed. | |
3890 set_req(i, new_in); | |
3891 progress = this; // Report progress | |
3892 } | |
3893 } | |
3894 | |
3895 if (new_base != old_base) { | |
3896 set_req(Compile::AliasIdxBot, new_base); | |
3897 // Don't use set_base_memory(new_base), because we need to update du. | |
3898 assert(base_memory() == new_base, ""); | |
3899 progress = this; | |
3900 } | |
3901 | |
3902 if( base_memory() == this ) { | |
3903 // a self cycle indicates this memory path is dead | |
3904 set_req(Compile::AliasIdxBot, empty_mem); | |
3905 } | |
3906 | |
3907 // Resolve external cycles by calling Ideal on a MergeMem base_memory | |
3908 // Recursion must occur after the self cycle check above | |
3909 if( base_memory()->is_MergeMem() ) { | |
3910 MergeMemNode *new_mbase = base_memory()->as_MergeMem(); | |
3911 Node *m = phase->transform(new_mbase); // Rollup any cycles | |
3912 if( m != NULL && (m->is_top() || | |
3913 m->is_MergeMem() && m->as_MergeMem()->base_memory() == empty_mem) ) { | |
3914 // propagate rollup of dead cycle to self | |
3915 set_req(Compile::AliasIdxBot, empty_mem); | |
3916 } | |
3917 } | |
3918 | |
3919 if( base_memory() == empty_mem ) { | |
3920 progress = this; | |
3921 // Cut inputs during Parse phase only. | |
3922 // During Optimize phase a dead MergeMem node will be subsumed by Top. | |
3923 if( !can_reshape ) { | |
3924 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3925 if( in(i) != empty_mem ) { set_req(i, empty_mem); } | |
3926 } | |
3927 } | |
3928 } | |
3929 | |
3930 if( !progress && base_memory()->is_Phi() && can_reshape ) { | |
3931 // Check if PhiNode::Ideal's "Split phis through memory merges" | |
3932 // transform should be attempted. Look for this->phi->this cycle. | |
3933 uint merge_width = req(); | |
3934 if (merge_width > Compile::AliasIdxRaw) { | |
3935 PhiNode* phi = base_memory()->as_Phi(); | |
3936 for( uint i = 1; i < phi->req(); ++i ) {// For all paths in | |
3937 if (phi->in(i) == this) { | |
3938 phase->is_IterGVN()->_worklist.push(phi); | |
3939 break; | |
3940 } | |
3941 } | |
3942 } | |
3943 } | |
3944 | |
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3945 assert(progress || verify_sparse(), "please, no dups of base"); |
0 | 3946 return progress; |
3947 } | |
3948 | |
3949 //-------------------------set_base_memory------------------------------------- | |
3950 void MergeMemNode::set_base_memory(Node *new_base) { | |
3951 Node* empty_mem = empty_memory(); | |
3952 set_req(Compile::AliasIdxBot, new_base); | |
3953 assert(memory_at(req()) == new_base, "must set default memory"); | |
3954 // Clear out other occurrences of new_base: | |
3955 if (new_base != empty_mem) { | |
3956 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3957 if (in(i) == new_base) set_req(i, empty_mem); | |
3958 } | |
3959 } | |
3960 } | |
3961 | |
3962 //------------------------------out_RegMask------------------------------------ | |
3963 const RegMask &MergeMemNode::out_RegMask() const { | |
3964 return RegMask::Empty; | |
3965 } | |
3966 | |
3967 //------------------------------dump_spec-------------------------------------- | |
3968 #ifndef PRODUCT | |
3969 void MergeMemNode::dump_spec(outputStream *st) const { | |
3970 st->print(" {"); | |
3971 Node* base_mem = base_memory(); | |
3972 for( uint i = Compile::AliasIdxRaw; i < req(); i++ ) { | |
3973 Node* mem = memory_at(i); | |
3974 if (mem == base_mem) { st->print(" -"); continue; } | |
3975 st->print( " N%d:", mem->_idx ); | |
3976 Compile::current()->get_adr_type(i)->dump_on(st); | |
3977 } | |
3978 st->print(" }"); | |
3979 } | |
3980 #endif // !PRODUCT | |
3981 | |
3982 | |
3983 #ifdef ASSERT | |
3984 static bool might_be_same(Node* a, Node* b) { | |
3985 if (a == b) return true; | |
3986 if (!(a->is_Phi() || b->is_Phi())) return false; | |
3987 // phis shift around during optimization | |
3988 return true; // pretty stupid... | |
3989 } | |
3990 | |
3991 // verify a narrow slice (either incoming or outgoing) | |
3992 static void verify_memory_slice(const MergeMemNode* m, int alias_idx, Node* n) { | |
3993 if (!VerifyAliases) return; // don't bother to verify unless requested | |
3994 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
3995 if (Node::in_dump()) return; // muzzle asserts when printing | |
3996 assert(alias_idx >= Compile::AliasIdxRaw, "must not disturb base_memory or sentinel"); | |
3997 assert(n != NULL, ""); | |
3998 // Elide intervening MergeMem's | |
3999 while (n->is_MergeMem()) { | |
4000 n = n->as_MergeMem()->memory_at(alias_idx); | |
4001 } | |
4002 Compile* C = Compile::current(); | |
4003 const TypePtr* n_adr_type = n->adr_type(); | |
4004 if (n == m->empty_memory()) { | |
4005 // Implicit copy of base_memory() | |
4006 } else if (n_adr_type != TypePtr::BOTTOM) { | |
4007 assert(n_adr_type != NULL, "new memory must have a well-defined adr_type"); | |
4008 assert(C->must_alias(n_adr_type, alias_idx), "new memory must match selected slice"); | |
4009 } else { | |
4010 // A few places like make_runtime_call "know" that VM calls are narrow, | |
4011 // and can be used to update only the VM bits stored as TypeRawPtr::BOTTOM. | |
4012 bool expected_wide_mem = false; | |
4013 if (n == m->base_memory()) { | |
4014 expected_wide_mem = true; | |
4015 } else if (alias_idx == Compile::AliasIdxRaw || | |
4016 n == m->memory_at(Compile::AliasIdxRaw)) { | |
4017 expected_wide_mem = true; | |
4018 } else if (!C->alias_type(alias_idx)->is_rewritable()) { | |
4019 // memory can "leak through" calls on channels that | |
4020 // are write-once. Allow this also. | |
4021 expected_wide_mem = true; | |
4022 } | |
4023 assert(expected_wide_mem, "expected narrow slice replacement"); | |
4024 } | |
4025 } | |
4026 #else // !ASSERT | |
4027 #define verify_memory_slice(m,i,n) (0) // PRODUCT version is no-op | |
4028 #endif | |
4029 | |
4030 | |
4031 //-----------------------------memory_at--------------------------------------- | |
4032 Node* MergeMemNode::memory_at(uint alias_idx) const { | |
4033 assert(alias_idx >= Compile::AliasIdxRaw || | |
4034 alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, | |
4035 "must avoid base_memory and AliasIdxTop"); | |
4036 | |
4037 // Otherwise, it is a narrow slice. | |
4038 Node* n = alias_idx < req() ? in(alias_idx) : empty_memory(); | |
4039 Compile *C = Compile::current(); | |
4040 if (is_empty_memory(n)) { | |
4041 // the array is sparse; empty slots are the "top" node | |
4042 n = base_memory(); | |
4043 assert(Node::in_dump() | |
4044 || n == NULL || n->bottom_type() == Type::TOP | |
4045 || n->adr_type() == TypePtr::BOTTOM | |
4046 || n->adr_type() == TypeRawPtr::BOTTOM | |
4047 || Compile::current()->AliasLevel() == 0, | |
4048 "must be a wide memory"); | |
4049 // AliasLevel == 0 if we are organizing the memory states manually. | |
4050 // See verify_memory_slice for comments on TypeRawPtr::BOTTOM. | |
4051 } else { | |
4052 // make sure the stored slice is sane | |
4053 #ifdef ASSERT | |
4054 if (is_error_reported() || Node::in_dump()) { | |
4055 } else if (might_be_same(n, base_memory())) { | |
4056 // Give it a pass: It is a mostly harmless repetition of the base. | |
4057 // This can arise normally from node subsumption during optimization. | |
4058 } else { | |
4059 verify_memory_slice(this, alias_idx, n); | |
4060 } | |
4061 #endif | |
4062 } | |
4063 return n; | |
4064 } | |
4065 | |
4066 //---------------------------set_memory_at------------------------------------- | |
4067 void MergeMemNode::set_memory_at(uint alias_idx, Node *n) { | |
4068 verify_memory_slice(this, alias_idx, n); | |
4069 Node* empty_mem = empty_memory(); | |
4070 if (n == base_memory()) n = empty_mem; // collapse default | |
4071 uint need_req = alias_idx+1; | |
4072 if (req() < need_req) { | |
4073 if (n == empty_mem) return; // already the default, so do not grow me | |
4074 // grow the sparse array | |
4075 do { | |
4076 add_req(empty_mem); | |
4077 } while (req() < need_req); | |
4078 } | |
4079 set_req( alias_idx, n ); | |
4080 } | |
4081 | |
4082 | |
4083 | |
4084 //--------------------------iteration_setup------------------------------------ | |
4085 void MergeMemNode::iteration_setup(const MergeMemNode* other) { | |
4086 if (other != NULL) { | |
4087 grow_to_match(other); | |
4088 // invariant: the finite support of mm2 is within mm->req() | |
4089 #ifdef ASSERT | |
4090 for (uint i = req(); i < other->req(); i++) { | |
4091 assert(other->is_empty_memory(other->in(i)), "slice left uncovered"); | |
4092 } | |
4093 #endif | |
4094 } | |
4095 // Replace spurious copies of base_memory by top. | |
4096 Node* base_mem = base_memory(); | |
4097 if (base_mem != NULL && !base_mem->is_top()) { | |
4098 for (uint i = Compile::AliasIdxBot+1, imax = req(); i < imax; i++) { | |
4099 if (in(i) == base_mem) | |
4100 set_req(i, empty_memory()); | |
4101 } | |
4102 } | |
4103 } | |
4104 | |
4105 //---------------------------grow_to_match------------------------------------- | |
4106 void MergeMemNode::grow_to_match(const MergeMemNode* other) { | |
4107 Node* empty_mem = empty_memory(); | |
4108 assert(other->is_empty_memory(empty_mem), "consistent sentinels"); | |
4109 // look for the finite support of the other memory | |
4110 for (uint i = other->req(); --i >= req(); ) { | |
4111 if (other->in(i) != empty_mem) { | |
4112 uint new_len = i+1; | |
4113 while (req() < new_len) add_req(empty_mem); | |
4114 break; | |
4115 } | |
4116 } | |
4117 } | |
4118 | |
4119 //---------------------------verify_sparse------------------------------------- | |
4120 #ifndef PRODUCT | |
4121 bool MergeMemNode::verify_sparse() const { | |
4122 assert(is_empty_memory(make_empty_memory()), "sane sentinel"); | |
4123 Node* base_mem = base_memory(); | |
4124 // The following can happen in degenerate cases, since empty==top. | |
4125 if (is_empty_memory(base_mem)) return true; | |
4126 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
4127 assert(in(i) != NULL, "sane slice"); | |
4128 if (in(i) == base_mem) return false; // should have been the sentinel value! | |
4129 } | |
4130 return true; | |
4131 } | |
4132 | |
4133 bool MergeMemStream::match_memory(Node* mem, const MergeMemNode* mm, int idx) { | |
4134 Node* n; | |
4135 n = mm->in(idx); | |
4136 if (mem == n) return true; // might be empty_memory() | |
4137 n = (idx == Compile::AliasIdxBot)? mm->base_memory(): mm->memory_at(idx); | |
4138 if (mem == n) return true; | |
4139 while (n->is_Phi() && (n = n->as_Phi()->is_copy()) != NULL) { | |
4140 if (mem == n) return true; | |
4141 if (n == NULL) break; | |
4142 } | |
4143 return false; | |
4144 } | |
4145 #endif // !PRODUCT |