Mercurial > hg > truffle
annotate src/share/vm/opto/memnode.cpp @ 223:1dd146f17531
6716441: error in meet with +DoEscapeAnalysis
Summary: Set instance_id to InstanceBot for InstPtr->meet(AryPtr) when types are not related.
Reviewed-by: jrose, never
author | kvn |
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date | Thu, 26 Jun 2008 13:34:00 -0700 |
parents | 1e026f8da827 |
children | 9c2ecc2ffb12 |
rev | line source |
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0 | 1 /* |
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. | |
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 *prev = NULL; |
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98 Node *result = mchain; |
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99 while (prev != result) { |
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100 prev = result; |
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101 // skip over a call which does not affect this memory slice |
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102 if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) { |
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103 Node *proj_in = result->in(0); |
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104 if (proj_in->is_Call()) { |
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105 CallNode *call = proj_in->as_Call(); |
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106 if (!call->may_modify(t_adr, phase)) { |
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107 result = call->in(TypeFunc::Memory); |
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108 } |
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109 } else if (proj_in->is_Initialize()) { |
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110 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); |
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111 // Stop if this is the initialization for the object instance which |
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112 // which contains this memory slice, otherwise skip over it. |
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113 if (alloc != NULL && alloc->_idx != instance_id) { |
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114 result = proj_in->in(TypeFunc::Memory); |
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115 } |
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116 } else if (proj_in->is_MemBar()) { |
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117 result = proj_in->in(TypeFunc::Memory); |
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118 } |
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119 } else if (result->is_MergeMem()) { |
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120 result = step_through_mergemem(phase, result->as_MergeMem(), t_adr, NULL, tty); |
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121 } |
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122 } |
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123 return result; |
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124 } |
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125 |
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126 Node *MemNode::optimize_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase) { |
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127 const TypeOopPtr *t_oop = t_adr->isa_oopptr(); |
223 | 128 bool is_instance = (t_oop != NULL) && t_oop->is_known_instance_field(); |
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129 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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130 Node *result = mchain; |
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131 result = optimize_simple_memory_chain(result, t_adr, phase); |
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132 if (is_instance && igvn != NULL && result->is_Phi()) { |
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133 PhiNode *mphi = result->as_Phi(); |
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134 assert(mphi->bottom_type() == Type::MEMORY, "memory phi required"); |
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135 const TypePtr *t = mphi->adr_type(); |
163 | 136 if (t == TypePtr::BOTTOM || t == TypeRawPtr::BOTTOM || |
223 | 137 t->isa_oopptr() && !t->is_oopptr()->is_known_instance() && |
138 t->is_oopptr()->cast_to_instance_id(t_oop->instance_id()) == t_oop) { | |
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139 // clone the Phi with our address type |
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140 result = mphi->split_out_instance(t_adr, igvn); |
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141 } else { |
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142 assert(phase->C->get_alias_index(t) == phase->C->get_alias_index(t_adr), "correct memory chain"); |
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143 } |
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144 } |
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145 return result; |
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146 } |
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147 |
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148 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st) { |
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149 uint alias_idx = phase->C->get_alias_index(tp); |
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150 Node *mem = mmem; |
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151 #ifdef ASSERT |
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152 { |
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153 // Check that current type is consistent with the alias index used during graph construction |
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154 assert(alias_idx >= Compile::AliasIdxRaw, "must not be a bad alias_idx"); |
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155 bool consistent = adr_check == NULL || adr_check->empty() || |
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156 phase->C->must_alias(adr_check, alias_idx ); |
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157 // Sometimes dead array references collapse to a[-1], a[-2], or a[-3] |
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158 if( !consistent && adr_check != NULL && !adr_check->empty() && |
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159 tp->isa_aryptr() && tp->offset() == Type::OffsetBot && |
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160 adr_check->isa_aryptr() && adr_check->offset() != Type::OffsetBot && |
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161 ( adr_check->offset() == arrayOopDesc::length_offset_in_bytes() || |
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162 adr_check->offset() == oopDesc::klass_offset_in_bytes() || |
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163 adr_check->offset() == oopDesc::mark_offset_in_bytes() ) ) { |
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164 // don't assert if it is dead code. |
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165 consistent = true; |
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166 } |
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167 if( !consistent ) { |
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168 st->print("alias_idx==%d, adr_check==", alias_idx); |
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169 if( adr_check == NULL ) { |
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170 st->print("NULL"); |
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171 } else { |
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172 adr_check->dump(); |
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173 } |
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174 st->cr(); |
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175 print_alias_types(); |
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176 assert(consistent, "adr_check must match alias idx"); |
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177 } |
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178 } |
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179 #endif |
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180 // TypeInstPtr::NOTNULL+any is an OOP with unknown offset - generally |
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181 // means an array I have not precisely typed yet. Do not do any |
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182 // alias stuff with it any time soon. |
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183 const TypeOopPtr *tinst = tp->isa_oopptr(); |
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184 if( tp->base() != Type::AnyPtr && |
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185 !(tinst && |
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186 tinst->klass()->is_java_lang_Object() && |
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187 tinst->offset() == Type::OffsetBot) ) { |
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188 // compress paths and change unreachable cycles to TOP |
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189 // If not, we can update the input infinitely along a MergeMem cycle |
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190 // Equivalent code in PhiNode::Ideal |
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191 Node* m = phase->transform(mmem); |
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192 // If tranformed to a MergeMem, get the desired slice |
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193 // Otherwise the returned node represents memory for every slice |
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194 mem = (m->is_MergeMem())? m->as_MergeMem()->memory_at(alias_idx) : m; |
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195 // Update input if it is progress over what we have now |
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196 } |
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197 return mem; |
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198 } |
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199 |
0 | 200 //--------------------------Ideal_common--------------------------------------- |
201 // Look for degenerate control and memory inputs. Bypass MergeMem inputs. | |
202 // Unhook non-raw memories from complete (macro-expanded) initializations. | |
203 Node *MemNode::Ideal_common(PhaseGVN *phase, bool can_reshape) { | |
204 // If our control input is a dead region, kill all below the region | |
205 Node *ctl = in(MemNode::Control); | |
206 if (ctl && remove_dead_region(phase, can_reshape)) | |
207 return this; | |
208 | |
209 // Ignore if memory is dead, or self-loop | |
210 Node *mem = in(MemNode::Memory); | |
211 if( phase->type( mem ) == Type::TOP ) return NodeSentinel; // caller will return NULL | |
212 assert( mem != this, "dead loop in MemNode::Ideal" ); | |
213 | |
214 Node *address = in(MemNode::Address); | |
215 const Type *t_adr = phase->type( address ); | |
216 if( t_adr == Type::TOP ) return NodeSentinel; // caller will return NULL | |
217 | |
218 // Avoid independent memory operations | |
219 Node* old_mem = mem; | |
220 | |
36 | 221 // The code which unhooks non-raw memories from complete (macro-expanded) |
222 // initializations was removed. After macro-expansion all stores catched | |
223 // by Initialize node became raw stores and there is no information | |
224 // which memory slices they modify. So it is unsafe to move any memory | |
225 // operation above these stores. Also in most cases hooked non-raw memories | |
226 // were already unhooked by using information from detect_ptr_independence() | |
227 // and find_previous_store(). | |
0 | 228 |
229 if (mem->is_MergeMem()) { | |
230 MergeMemNode* mmem = mem->as_MergeMem(); | |
231 const TypePtr *tp = t_adr->is_ptr(); | |
64
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232 |
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233 mem = step_through_mergemem(phase, mmem, tp, adr_type(), tty); |
0 | 234 } |
235 | |
236 if (mem != old_mem) { | |
237 set_req(MemNode::Memory, mem); | |
238 return this; | |
239 } | |
240 | |
241 // let the subclass continue analyzing... | |
242 return NULL; | |
243 } | |
244 | |
245 // Helper function for proving some simple control dominations. | |
119
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246 // Attempt to prove that all control inputs of 'dom' dominate 'sub'. |
0 | 247 // Already assumes that 'dom' is available at 'sub', and that 'sub' |
248 // is not a constant (dominated by the method's StartNode). | |
249 // Used by MemNode::find_previous_store to prove that the | |
250 // control input of a memory operation predates (dominates) | |
251 // an allocation it wants to look past. | |
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252 bool MemNode::all_controls_dominate(Node* dom, Node* sub) { |
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253 if (dom == NULL || dom->is_top() || sub == NULL || sub->is_top()) |
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254 return false; // Conservative answer for dead code |
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255 |
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256 // Check 'dom'. Skip Proj and CatchProj nodes. |
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257 dom = dom->find_exact_control(dom); |
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258 if (dom == NULL || dom->is_top()) |
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259 return false; // Conservative answer for dead code |
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260 |
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261 if (dom == sub) { |
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262 // For the case when, for example, 'sub' is Initialize and the original |
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263 // 'dom' is Proj node of the 'sub'. |
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264 return false; |
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265 } |
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266 |
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267 if (dom->is_Con() || dom->is_Start() || dom->is_Root() || dom == sub) |
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268 return true; |
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269 |
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270 // 'dom' dominates 'sub' if its control edge and control edges |
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271 // of all its inputs dominate or equal to sub's control edge. |
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272 |
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273 // Currently 'sub' is either Allocate, Initialize or Start nodes. |
163 | 274 // Or Region for the check in LoadNode::Ideal(); |
275 // 'sub' should have sub->in(0) != NULL. | |
276 assert(sub->is_Allocate() || sub->is_Initialize() || sub->is_Start() || | |
277 sub->is_Region(), "expecting only these nodes"); | |
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278 |
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279 // Get control edge of 'sub'. |
193
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280 Node* orig_sub = sub; |
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281 sub = sub->find_exact_control(sub->in(0)); |
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282 if (sub == NULL || sub->is_top()) |
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283 return false; // Conservative answer for dead code |
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284 |
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285 assert(sub->is_CFG(), "expecting control"); |
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286 |
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287 if (sub == dom) |
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288 return true; |
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289 |
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290 if (sub->is_Start() || sub->is_Root()) |
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291 return false; |
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292 |
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293 { |
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294 // Check all control edges of 'dom'. |
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295 |
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296 ResourceMark rm; |
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297 Arena* arena = Thread::current()->resource_area(); |
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298 Node_List nlist(arena); |
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299 Unique_Node_List dom_list(arena); |
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300 |
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301 dom_list.push(dom); |
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302 bool only_dominating_controls = false; |
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303 |
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304 for (uint next = 0; next < dom_list.size(); next++) { |
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305 Node* n = dom_list.at(next); |
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306 if (n == orig_sub) |
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307 return false; // One of dom's inputs dominated by sub. |
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308 if (!n->is_CFG() && n->pinned()) { |
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309 // Check only own control edge for pinned non-control nodes. |
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310 n = n->find_exact_control(n->in(0)); |
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311 if (n == NULL || n->is_top()) |
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312 return false; // Conservative answer for dead code |
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313 assert(n->is_CFG(), "expecting control"); |
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314 dom_list.push(n); |
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315 } else if (n->is_Con() || n->is_Start() || n->is_Root()) { |
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316 only_dominating_controls = true; |
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317 } else if (n->is_CFG()) { |
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318 if (n->dominates(sub, nlist)) |
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319 only_dominating_controls = true; |
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320 else |
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321 return false; |
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322 } else { |
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323 // First, own control edge. |
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324 Node* m = n->find_exact_control(n->in(0)); |
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325 if (m != NULL) { |
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326 if (m->is_top()) |
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327 return false; // Conservative answer for dead code |
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328 dom_list.push(m); |
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329 } |
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330 // Now, the rest of edges. |
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331 uint cnt = n->req(); |
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332 for (uint i = 1; i < cnt; i++) { |
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333 m = n->find_exact_control(n->in(i)); |
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334 if (m == NULL || m->is_top()) |
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335 continue; |
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336 dom_list.push(m); |
0 | 337 } |
338 } | |
339 } | |
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340 return only_dominating_controls; |
0 | 341 } |
342 } | |
343 | |
344 //---------------------detect_ptr_independence--------------------------------- | |
345 // Used by MemNode::find_previous_store to prove that two base | |
346 // pointers are never equal. | |
347 // The pointers are accompanied by their associated allocations, | |
348 // if any, which have been previously discovered by the caller. | |
349 bool MemNode::detect_ptr_independence(Node* p1, AllocateNode* a1, | |
350 Node* p2, AllocateNode* a2, | |
351 PhaseTransform* phase) { | |
352 // Attempt to prove that these two pointers cannot be aliased. | |
353 // They may both manifestly be allocations, and they should differ. | |
354 // Or, if they are not both allocations, they can be distinct constants. | |
355 // Otherwise, one is an allocation and the other a pre-existing value. | |
356 if (a1 == NULL && a2 == NULL) { // neither an allocation | |
357 return (p1 != p2) && p1->is_Con() && p2->is_Con(); | |
358 } else if (a1 != NULL && a2 != NULL) { // both allocations | |
359 return (a1 != a2); | |
360 } else if (a1 != NULL) { // one allocation a1 | |
361 // (Note: p2->is_Con implies p2->in(0)->is_Root, which dominates.) | |
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362 return all_controls_dominate(p2, a1); |
0 | 363 } else { //(a2 != NULL) // one allocation a2 |
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364 return all_controls_dominate(p1, a2); |
0 | 365 } |
366 return false; | |
367 } | |
368 | |
369 | |
370 // The logic for reordering loads and stores uses four steps: | |
371 // (a) Walk carefully past stores and initializations which we | |
372 // can prove are independent of this load. | |
373 // (b) Observe that the next memory state makes an exact match | |
374 // with self (load or store), and locate the relevant store. | |
375 // (c) Ensure that, if we were to wire self directly to the store, | |
376 // the optimizer would fold it up somehow. | |
377 // (d) Do the rewiring, and return, depending on some other part of | |
378 // the optimizer to fold up the load. | |
379 // This routine handles steps (a) and (b). Steps (c) and (d) are | |
380 // specific to loads and stores, so they are handled by the callers. | |
381 // (Currently, only LoadNode::Ideal has steps (c), (d). More later.) | |
382 // | |
383 Node* MemNode::find_previous_store(PhaseTransform* phase) { | |
384 Node* ctrl = in(MemNode::Control); | |
385 Node* adr = in(MemNode::Address); | |
386 intptr_t offset = 0; | |
387 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
388 AllocateNode* alloc = AllocateNode::Ideal_allocation(base, phase); | |
389 | |
390 if (offset == Type::OffsetBot) | |
391 return NULL; // cannot unalias unless there are precise offsets | |
392 | |
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393 const TypeOopPtr *addr_t = adr->bottom_type()->isa_oopptr(); |
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394 |
0 | 395 intptr_t size_in_bytes = memory_size(); |
396 | |
397 Node* mem = in(MemNode::Memory); // start searching here... | |
398 | |
399 int cnt = 50; // Cycle limiter | |
400 for (;;) { // While we can dance past unrelated stores... | |
401 if (--cnt < 0) break; // Caught in cycle or a complicated dance? | |
402 | |
403 if (mem->is_Store()) { | |
404 Node* st_adr = mem->in(MemNode::Address); | |
405 intptr_t st_offset = 0; | |
406 Node* st_base = AddPNode::Ideal_base_and_offset(st_adr, phase, st_offset); | |
407 if (st_base == NULL) | |
408 break; // inscrutable pointer | |
409 if (st_offset != offset && st_offset != Type::OffsetBot) { | |
410 const int MAX_STORE = BytesPerLong; | |
411 if (st_offset >= offset + size_in_bytes || | |
412 st_offset <= offset - MAX_STORE || | |
413 st_offset <= offset - mem->as_Store()->memory_size()) { | |
414 // Success: The offsets are provably independent. | |
415 // (You may ask, why not just test st_offset != offset and be done? | |
416 // The answer is that stores of different sizes can co-exist | |
417 // in the same sequence of RawMem effects. We sometimes initialize | |
418 // a whole 'tile' of array elements with a single jint or jlong.) | |
419 mem = mem->in(MemNode::Memory); | |
420 continue; // (a) advance through independent store memory | |
421 } | |
422 } | |
423 if (st_base != base && | |
424 detect_ptr_independence(base, alloc, | |
425 st_base, | |
426 AllocateNode::Ideal_allocation(st_base, phase), | |
427 phase)) { | |
428 // Success: The bases are provably independent. | |
429 mem = mem->in(MemNode::Memory); | |
430 continue; // (a) advance through independent store memory | |
431 } | |
432 | |
433 // (b) At this point, if the bases or offsets do not agree, we lose, | |
434 // since we have not managed to prove 'this' and 'mem' independent. | |
435 if (st_base == base && st_offset == offset) { | |
436 return mem; // let caller handle steps (c), (d) | |
437 } | |
438 | |
439 } else if (mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
440 InitializeNode* st_init = mem->in(0)->as_Initialize(); | |
441 AllocateNode* st_alloc = st_init->allocation(); | |
442 if (st_alloc == NULL) | |
443 break; // something degenerated | |
444 bool known_identical = false; | |
445 bool known_independent = false; | |
446 if (alloc == st_alloc) | |
447 known_identical = true; | |
448 else if (alloc != NULL) | |
449 known_independent = true; | |
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450 else if (all_controls_dominate(this, st_alloc)) |
0 | 451 known_independent = true; |
452 | |
453 if (known_independent) { | |
454 // The bases are provably independent: Either they are | |
455 // manifestly distinct allocations, or else the control | |
456 // of this load dominates the store's allocation. | |
457 int alias_idx = phase->C->get_alias_index(adr_type()); | |
458 if (alias_idx == Compile::AliasIdxRaw) { | |
459 mem = st_alloc->in(TypeFunc::Memory); | |
460 } else { | |
461 mem = st_init->memory(alias_idx); | |
462 } | |
463 continue; // (a) advance through independent store memory | |
464 } | |
465 | |
466 // (b) at this point, if we are not looking at a store initializing | |
467 // the same allocation we are loading from, we lose. | |
468 if (known_identical) { | |
469 // From caller, can_see_stored_value will consult find_captured_store. | |
470 return mem; // let caller handle steps (c), (d) | |
471 } | |
472 | |
223 | 473 } else if (addr_t != NULL && addr_t->is_known_instance_field()) { |
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474 // Can't use optimize_simple_memory_chain() since it needs PhaseGVN. |
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475 if (mem->is_Proj() && mem->in(0)->is_Call()) { |
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476 CallNode *call = mem->in(0)->as_Call(); |
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477 if (!call->may_modify(addr_t, phase)) { |
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478 mem = call->in(TypeFunc::Memory); |
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479 continue; // (a) advance through independent call memory |
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480 } |
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481 } else if (mem->is_Proj() && mem->in(0)->is_MemBar()) { |
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482 mem = mem->in(0)->in(TypeFunc::Memory); |
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483 continue; // (a) advance through independent MemBar memory |
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484 } else if (mem->is_MergeMem()) { |
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485 int alias_idx = phase->C->get_alias_index(adr_type()); |
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486 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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487 continue; // (a) advance through independent MergeMem memory |
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488 } |
0 | 489 } |
490 | |
491 // Unless there is an explicit 'continue', we must bail out here, | |
492 // because 'mem' is an inscrutable memory state (e.g., a call). | |
493 break; | |
494 } | |
495 | |
496 return NULL; // bail out | |
497 } | |
498 | |
499 //----------------------calculate_adr_type------------------------------------- | |
500 // Helper function. Notices when the given type of address hits top or bottom. | |
501 // Also, asserts a cross-check of the type against the expected address type. | |
502 const TypePtr* MemNode::calculate_adr_type(const Type* t, const TypePtr* cross_check) { | |
503 if (t == Type::TOP) return NULL; // does not touch memory any more? | |
504 #ifdef PRODUCT | |
505 cross_check = NULL; | |
506 #else | |
507 if (!VerifyAliases || is_error_reported() || Node::in_dump()) cross_check = NULL; | |
508 #endif | |
509 const TypePtr* tp = t->isa_ptr(); | |
510 if (tp == NULL) { | |
511 assert(cross_check == NULL || cross_check == TypePtr::BOTTOM, "expected memory type must be wide"); | |
512 return TypePtr::BOTTOM; // touches lots of memory | |
513 } else { | |
514 #ifdef ASSERT | |
515 // %%%% [phh] We don't check the alias index if cross_check is | |
516 // TypeRawPtr::BOTTOM. Needs to be investigated. | |
517 if (cross_check != NULL && | |
518 cross_check != TypePtr::BOTTOM && | |
519 cross_check != TypeRawPtr::BOTTOM) { | |
520 // Recheck the alias index, to see if it has changed (due to a bug). | |
521 Compile* C = Compile::current(); | |
522 assert(C->get_alias_index(cross_check) == C->get_alias_index(tp), | |
523 "must stay in the original alias category"); | |
524 // The type of the address must be contained in the adr_type, | |
525 // disregarding "null"-ness. | |
526 // (We make an exception for TypeRawPtr::BOTTOM, which is a bit bucket.) | |
527 const TypePtr* tp_notnull = tp->join(TypePtr::NOTNULL)->is_ptr(); | |
528 assert(cross_check->meet(tp_notnull) == cross_check, | |
529 "real address must not escape from expected memory type"); | |
530 } | |
531 #endif | |
532 return tp; | |
533 } | |
534 } | |
535 | |
536 //------------------------adr_phi_is_loop_invariant---------------------------- | |
537 // A helper function for Ideal_DU_postCCP to check if a Phi in a counted | |
538 // loop is loop invariant. Make a quick traversal of Phi and associated | |
539 // CastPP nodes, looking to see if they are a closed group within the loop. | |
540 bool MemNode::adr_phi_is_loop_invariant(Node* adr_phi, Node* cast) { | |
541 // The idea is that the phi-nest must boil down to only CastPP nodes | |
542 // with the same data. This implies that any path into the loop already | |
543 // includes such a CastPP, and so the original cast, whatever its input, | |
544 // must be covered by an equivalent cast, with an earlier control input. | |
545 ResourceMark rm; | |
546 | |
547 // The loop entry input of the phi should be the unique dominating | |
548 // node for every Phi/CastPP in the loop. | |
549 Unique_Node_List closure; | |
550 closure.push(adr_phi->in(LoopNode::EntryControl)); | |
551 | |
552 // Add the phi node and the cast to the worklist. | |
553 Unique_Node_List worklist; | |
554 worklist.push(adr_phi); | |
555 if( cast != NULL ){ | |
556 if( !cast->is_ConstraintCast() ) return false; | |
557 worklist.push(cast); | |
558 } | |
559 | |
560 // Begin recursive walk of phi nodes. | |
561 while( worklist.size() ){ | |
562 // Take a node off the worklist | |
563 Node *n = worklist.pop(); | |
564 if( !closure.member(n) ){ | |
565 // Add it to the closure. | |
566 closure.push(n); | |
567 // Make a sanity check to ensure we don't waste too much time here. | |
568 if( closure.size() > 20) return false; | |
569 // This node is OK if: | |
570 // - it is a cast of an identical value | |
571 // - or it is a phi node (then we add its inputs to the worklist) | |
572 // Otherwise, the node is not OK, and we presume the cast is not invariant | |
573 if( n->is_ConstraintCast() ){ | |
574 worklist.push(n->in(1)); | |
575 } else if( n->is_Phi() ) { | |
576 for( uint i = 1; i < n->req(); i++ ) { | |
577 worklist.push(n->in(i)); | |
578 } | |
579 } else { | |
580 return false; | |
581 } | |
582 } | |
583 } | |
584 | |
585 // Quit when the worklist is empty, and we've found no offending nodes. | |
586 return true; | |
587 } | |
588 | |
589 //------------------------------Ideal_DU_postCCP------------------------------- | |
590 // Find any cast-away of null-ness and keep its control. Null cast-aways are | |
591 // going away in this pass and we need to make this memory op depend on the | |
592 // gating null check. | |
163 | 593 Node *MemNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
594 return Ideal_common_DU_postCCP(ccp, this, in(MemNode::Address)); | |
595 } | |
0 | 596 |
597 // I tried to leave the CastPP's in. This makes the graph more accurate in | |
598 // some sense; we get to keep around the knowledge that an oop is not-null | |
599 // after some test. Alas, the CastPP's interfere with GVN (some values are | |
600 // the regular oop, some are the CastPP of the oop, all merge at Phi's which | |
601 // cannot collapse, etc). This cost us 10% on SpecJVM, even when I removed | |
602 // some of the more trivial cases in the optimizer. Removing more useless | |
603 // Phi's started allowing Loads to illegally float above null checks. I gave | |
604 // up on this approach. CNC 10/20/2000 | |
163 | 605 // This static method may be called not from MemNode (EncodePNode calls it). |
606 // Only the control edge of the node 'n' might be updated. | |
607 Node *MemNode::Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr ) { | |
0 | 608 Node *skipped_cast = NULL; |
609 // Need a null check? Regular static accesses do not because they are | |
610 // from constant addresses. Array ops are gated by the range check (which | |
611 // always includes a NULL check). Just check field ops. | |
163 | 612 if( n->in(MemNode::Control) == NULL ) { |
0 | 613 // Scan upwards for the highest location we can place this memory op. |
614 while( true ) { | |
615 switch( adr->Opcode() ) { | |
616 | |
617 case Op_AddP: // No change to NULL-ness, so peek thru AddP's | |
618 adr = adr->in(AddPNode::Base); | |
619 continue; | |
620 | |
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621 case Op_DecodeN: // No change to NULL-ness, so peek thru |
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622 adr = adr->in(1); |
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623 continue; |
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624 |
0 | 625 case Op_CastPP: |
626 // If the CastPP is useless, just peek on through it. | |
627 if( ccp->type(adr) == ccp->type(adr->in(1)) ) { | |
628 // Remember the cast that we've peeked though. If we peek | |
629 // through more than one, then we end up remembering the highest | |
630 // one, that is, if in a loop, the one closest to the top. | |
631 skipped_cast = adr; | |
632 adr = adr->in(1); | |
633 continue; | |
634 } | |
635 // CastPP is going away in this pass! We need this memory op to be | |
636 // control-dependent on the test that is guarding the CastPP. | |
163 | 637 ccp->hash_delete(n); |
638 n->set_req(MemNode::Control, adr->in(0)); | |
639 ccp->hash_insert(n); | |
640 return n; | |
0 | 641 |
642 case Op_Phi: | |
643 // Attempt to float above a Phi to some dominating point. | |
644 if (adr->in(0) != NULL && adr->in(0)->is_CountedLoop()) { | |
645 // If we've already peeked through a Cast (which could have set the | |
646 // control), we can't float above a Phi, because the skipped Cast | |
647 // may not be loop invariant. | |
648 if (adr_phi_is_loop_invariant(adr, skipped_cast)) { | |
649 adr = adr->in(1); | |
650 continue; | |
651 } | |
652 } | |
653 | |
654 // Intentional fallthrough! | |
655 | |
656 // No obvious dominating point. The mem op is pinned below the Phi | |
657 // by the Phi itself. If the Phi goes away (no true value is merged) | |
658 // then the mem op can float, but not indefinitely. It must be pinned | |
659 // behind the controls leading to the Phi. | |
660 case Op_CheckCastPP: | |
661 // These usually stick around to change address type, however a | |
662 // useless one can be elided and we still need to pick up a control edge | |
663 if (adr->in(0) == NULL) { | |
664 // This CheckCastPP node has NO control and is likely useless. But we | |
665 // need check further up the ancestor chain for a control input to keep | |
666 // the node in place. 4959717. | |
667 skipped_cast = adr; | |
668 adr = adr->in(1); | |
669 continue; | |
670 } | |
163 | 671 ccp->hash_delete(n); |
672 n->set_req(MemNode::Control, adr->in(0)); | |
673 ccp->hash_insert(n); | |
674 return n; | |
0 | 675 |
676 // List of "safe" opcodes; those that implicitly block the memory | |
677 // op below any null check. | |
678 case Op_CastX2P: // no null checks on native pointers | |
679 case Op_Parm: // 'this' pointer is not null | |
680 case Op_LoadP: // Loading from within a klass | |
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681 case Op_LoadN: // Loading from within a klass |
0 | 682 case Op_LoadKlass: // Loading from within a klass |
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683 case Op_LoadNKlass: // Loading from within a klass |
0 | 684 case Op_ConP: // Loading from a klass |
163 | 685 case Op_ConN: // Loading from a klass |
0 | 686 case Op_CreateEx: // Sucking up the guts of an exception oop |
687 case Op_Con: // Reading from TLS | |
688 case Op_CMoveP: // CMoveP is pinned | |
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689 case Op_CMoveN: // CMoveN is pinned |
0 | 690 break; // No progress |
691 | |
692 case Op_Proj: // Direct call to an allocation routine | |
693 case Op_SCMemProj: // Memory state from store conditional ops | |
694 #ifdef ASSERT | |
695 { | |
696 assert(adr->as_Proj()->_con == TypeFunc::Parms, "must be return value"); | |
697 const Node* call = adr->in(0); | |
163 | 698 if (call->is_CallJava()) { |
699 const CallJavaNode* call_java = call->as_CallJava(); | |
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700 const TypeTuple *r = call_java->tf()->range(); |
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701 assert(r->cnt() > TypeFunc::Parms, "must return value"); |
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702 const Type* ret_type = r->field_at(TypeFunc::Parms); |
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703 assert(ret_type && ret_type->isa_ptr(), "must return pointer"); |
0 | 704 // We further presume that this is one of |
705 // new_instance_Java, new_array_Java, or | |
706 // the like, but do not assert for this. | |
707 } else if (call->is_Allocate()) { | |
708 // similar case to new_instance_Java, etc. | |
709 } else if (!call->is_CallLeaf()) { | |
710 // Projections from fetch_oop (OSR) are allowed as well. | |
711 ShouldNotReachHere(); | |
712 } | |
713 } | |
714 #endif | |
715 break; | |
716 default: | |
717 ShouldNotReachHere(); | |
718 } | |
719 break; | |
720 } | |
721 } | |
722 | |
723 return NULL; // No progress | |
724 } | |
725 | |
726 | |
727 //============================================================================= | |
728 uint LoadNode::size_of() const { return sizeof(*this); } | |
729 uint LoadNode::cmp( const Node &n ) const | |
730 { return !Type::cmp( _type, ((LoadNode&)n)._type ); } | |
731 const Type *LoadNode::bottom_type() const { return _type; } | |
732 uint LoadNode::ideal_reg() const { | |
733 return Matcher::base2reg[_type->base()]; | |
734 } | |
735 | |
736 #ifndef PRODUCT | |
737 void LoadNode::dump_spec(outputStream *st) const { | |
738 MemNode::dump_spec(st); | |
739 if( !Verbose && !WizardMode ) { | |
740 // standard dump does this in Verbose and WizardMode | |
741 st->print(" #"); _type->dump_on(st); | |
742 } | |
743 } | |
744 #endif | |
745 | |
746 | |
747 //----------------------------LoadNode::make----------------------------------- | |
748 // Polymorphic factory method: | |
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749 Node *LoadNode::make( PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const TypePtr* adr_type, const Type *rt, BasicType bt ) { |
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750 Compile* C = gvn.C; |
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751 |
0 | 752 // sanity check the alias category against the created node type |
753 assert(!(adr_type->isa_oopptr() && | |
754 adr_type->offset() == oopDesc::klass_offset_in_bytes()), | |
755 "use LoadKlassNode instead"); | |
756 assert(!(adr_type->isa_aryptr() && | |
757 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()), | |
758 "use LoadRangeNode instead"); | |
759 switch (bt) { | |
760 case T_BOOLEAN: | |
761 case T_BYTE: return new (C, 3) LoadBNode(ctl, mem, adr, adr_type, rt->is_int() ); | |
762 case T_INT: return new (C, 3) LoadINode(ctl, mem, adr, adr_type, rt->is_int() ); | |
763 case T_CHAR: return new (C, 3) LoadCNode(ctl, mem, adr, adr_type, rt->is_int() ); | |
764 case T_SHORT: return new (C, 3) LoadSNode(ctl, mem, adr, adr_type, rt->is_int() ); | |
765 case T_LONG: return new (C, 3) LoadLNode(ctl, mem, adr, adr_type, rt->is_long() ); | |
766 case T_FLOAT: return new (C, 3) LoadFNode(ctl, mem, adr, adr_type, rt ); | |
767 case T_DOUBLE: return new (C, 3) LoadDNode(ctl, mem, adr, adr_type, rt ); | |
768 case T_ADDRESS: return new (C, 3) LoadPNode(ctl, mem, adr, adr_type, rt->is_ptr() ); | |
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769 case T_OBJECT: |
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770 #ifdef _LP64 |
163 | 771 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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772 Node* load = gvn.transform(new (C, 3) LoadNNode(ctl, mem, adr, adr_type, rt->make_narrowoop())); |
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773 return new (C, 2) DecodeNNode(load, load->bottom_type()->make_ptr()); |
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774 } else |
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775 #endif |
163 | 776 { |
777 assert(!adr->bottom_type()->is_ptr_to_narrowoop(), "should have got back a narrow oop"); | |
778 return new (C, 3) LoadPNode(ctl, mem, adr, adr_type, rt->is_oopptr()); | |
779 } | |
0 | 780 } |
781 ShouldNotReachHere(); | |
782 return (LoadNode*)NULL; | |
783 } | |
784 | |
785 LoadLNode* LoadLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt) { | |
786 bool require_atomic = true; | |
787 return new (C, 3) LoadLNode(ctl, mem, adr, adr_type, rt->is_long(), require_atomic); | |
788 } | |
789 | |
790 | |
791 | |
792 | |
793 //------------------------------hash------------------------------------------- | |
794 uint LoadNode::hash() const { | |
795 // unroll addition of interesting fields | |
796 return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address); | |
797 } | |
798 | |
799 //---------------------------can_see_stored_value------------------------------ | |
800 // This routine exists to make sure this set of tests is done the same | |
801 // everywhere. We need to make a coordinated change: first LoadNode::Ideal | |
802 // will change the graph shape in a way which makes memory alive twice at the | |
803 // same time (uses the Oracle model of aliasing), then some | |
804 // LoadXNode::Identity will fold things back to the equivalence-class model | |
805 // of aliasing. | |
806 Node* MemNode::can_see_stored_value(Node* st, PhaseTransform* phase) const { | |
807 Node* ld_adr = in(MemNode::Address); | |
808 | |
17
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809 const TypeInstPtr* tp = phase->type(ld_adr)->isa_instptr(); |
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810 Compile::AliasType* atp = tp != NULL ? phase->C->alias_type(tp) : NULL; |
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811 if (EliminateAutoBox && atp != NULL && atp->index() >= Compile::AliasIdxRaw && |
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812 atp->field() != NULL && !atp->field()->is_volatile()) { |
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813 uint alias_idx = atp->index(); |
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814 bool final = atp->field()->is_final(); |
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815 Node* result = NULL; |
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816 Node* current = st; |
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817 // Skip through chains of MemBarNodes checking the MergeMems for |
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818 // new states for the slice of this load. Stop once any other |
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819 // kind of node is encountered. Loads from final memory can skip |
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820 // through any kind of MemBar but normal loads shouldn't skip |
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821 // through MemBarAcquire since the could allow them to move out of |
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822 // a synchronized region. |
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823 while (current->is_Proj()) { |
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824 int opc = current->in(0)->Opcode(); |
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825 if ((final && opc == Op_MemBarAcquire) || |
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826 opc == Op_MemBarRelease || opc == Op_MemBarCPUOrder) { |
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827 Node* mem = current->in(0)->in(TypeFunc::Memory); |
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828 if (mem->is_MergeMem()) { |
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829 MergeMemNode* merge = mem->as_MergeMem(); |
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830 Node* new_st = merge->memory_at(alias_idx); |
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831 if (new_st == merge->base_memory()) { |
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832 // Keep searching |
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833 current = merge->base_memory(); |
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834 continue; |
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835 } |
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836 // Save the new memory state for the slice and fall through |
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837 // to exit. |
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838 result = new_st; |
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839 } |
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840 } |
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841 break; |
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842 } |
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843 if (result != NULL) { |
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844 st = result; |
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845 } |
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846 } |
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847 |
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848 |
0 | 849 // Loop around twice in the case Load -> Initialize -> Store. |
850 // (See PhaseIterGVN::add_users_to_worklist, which knows about this case.) | |
851 for (int trip = 0; trip <= 1; trip++) { | |
852 | |
853 if (st->is_Store()) { | |
854 Node* st_adr = st->in(MemNode::Address); | |
855 if (!phase->eqv(st_adr, ld_adr)) { | |
856 // Try harder before giving up... Match raw and non-raw pointers. | |
857 intptr_t st_off = 0; | |
858 AllocateNode* alloc = AllocateNode::Ideal_allocation(st_adr, phase, st_off); | |
859 if (alloc == NULL) return NULL; | |
860 intptr_t ld_off = 0; | |
861 AllocateNode* allo2 = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off); | |
862 if (alloc != allo2) return NULL; | |
863 if (ld_off != st_off) return NULL; | |
864 // At this point we have proven something like this setup: | |
865 // A = Allocate(...) | |
866 // L = LoadQ(, AddP(CastPP(, A.Parm),, #Off)) | |
867 // S = StoreQ(, AddP(, A.Parm , #Off), V) | |
868 // (Actually, we haven't yet proven the Q's are the same.) | |
869 // In other words, we are loading from a casted version of | |
870 // the same pointer-and-offset that we stored to. | |
871 // Thus, we are able to replace L by V. | |
872 } | |
873 // Now prove that we have a LoadQ matched to a StoreQ, for some Q. | |
874 if (store_Opcode() != st->Opcode()) | |
875 return NULL; | |
876 return st->in(MemNode::ValueIn); | |
877 } | |
878 | |
879 intptr_t offset = 0; // scratch | |
880 | |
881 // A load from a freshly-created object always returns zero. | |
882 // (This can happen after LoadNode::Ideal resets the load's memory input | |
883 // to find_captured_store, which returned InitializeNode::zero_memory.) | |
884 if (st->is_Proj() && st->in(0)->is_Allocate() && | |
885 st->in(0) == AllocateNode::Ideal_allocation(ld_adr, phase, offset) && | |
886 offset >= st->in(0)->as_Allocate()->minimum_header_size()) { | |
887 // return a zero value for the load's basic type | |
888 // (This is one of the few places where a generic PhaseTransform | |
889 // can create new nodes. Think of it as lazily manifesting | |
890 // virtually pre-existing constants.) | |
891 return phase->zerocon(memory_type()); | |
892 } | |
893 | |
894 // A load from an initialization barrier can match a captured store. | |
895 if (st->is_Proj() && st->in(0)->is_Initialize()) { | |
896 InitializeNode* init = st->in(0)->as_Initialize(); | |
897 AllocateNode* alloc = init->allocation(); | |
898 if (alloc != NULL && | |
899 alloc == AllocateNode::Ideal_allocation(ld_adr, phase, offset)) { | |
900 // examine a captured store value | |
901 st = init->find_captured_store(offset, memory_size(), phase); | |
902 if (st != NULL) | |
903 continue; // take one more trip around | |
904 } | |
905 } | |
906 | |
907 break; | |
908 } | |
909 | |
910 return NULL; | |
911 } | |
912 | |
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913 //----------------------is_instance_field_load_with_local_phi------------------ |
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914 bool LoadNode::is_instance_field_load_with_local_phi(Node* ctrl) { |
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915 if( in(MemNode::Memory)->is_Phi() && in(MemNode::Memory)->in(0) == ctrl && |
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916 in(MemNode::Address)->is_AddP() ) { |
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917 const TypeOopPtr* t_oop = in(MemNode::Address)->bottom_type()->isa_oopptr(); |
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918 // Only instances. |
223 | 919 if( t_oop != NULL && t_oop->is_known_instance_field() && |
64
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920 t_oop->offset() != Type::OffsetBot && |
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921 t_oop->offset() != Type::OffsetTop) { |
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922 return true; |
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923 } |
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924 } |
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925 return false; |
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926 } |
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927 |
0 | 928 //------------------------------Identity--------------------------------------- |
929 // Loads are identity if previous store is to same address | |
930 Node *LoadNode::Identity( PhaseTransform *phase ) { | |
931 // If the previous store-maker is the right kind of Store, and the store is | |
932 // to the same address, then we are equal to the value stored. | |
933 Node* mem = in(MemNode::Memory); | |
934 Node* value = can_see_stored_value(mem, phase); | |
935 if( value ) { | |
936 // byte, short & char stores truncate naturally. | |
937 // A load has to load the truncated value which requires | |
938 // some sort of masking operation and that requires an | |
939 // Ideal call instead of an Identity call. | |
940 if (memory_size() < BytesPerInt) { | |
941 // If the input to the store does not fit with the load's result type, | |
942 // it must be truncated via an Ideal call. | |
943 if (!phase->type(value)->higher_equal(phase->type(this))) | |
944 return this; | |
945 } | |
946 // (This works even when value is a Con, but LoadNode::Value | |
947 // usually runs first, producing the singleton type of the Con.) | |
948 return value; | |
949 } | |
64
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950 |
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951 // Search for an existing data phi which was generated before for the same |
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952 // instance's field to avoid infinite genertion of phis in a loop. |
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953 Node *region = mem->in(0); |
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954 if (is_instance_field_load_with_local_phi(region)) { |
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955 const TypePtr *addr_t = in(MemNode::Address)->bottom_type()->isa_ptr(); |
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956 int this_index = phase->C->get_alias_index(addr_t); |
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957 int this_offset = addr_t->offset(); |
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958 int this_id = addr_t->is_oopptr()->instance_id(); |
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959 const Type* this_type = bottom_type(); |
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960 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
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961 Node* phi = region->fast_out(i); |
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962 if (phi->is_Phi() && phi != mem && |
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963 phi->as_Phi()->is_same_inst_field(this_type, this_id, this_index, this_offset)) { |
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964 return phi; |
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965 } |
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966 } |
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967 } |
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968 |
0 | 969 return this; |
970 } | |
971 | |
17
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972 |
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973 // Returns true if the AliasType refers to the field that holds the |
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974 // cached box array. Currently only handles the IntegerCache case. |
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975 static bool is_autobox_cache(Compile::AliasType* atp) { |
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976 if (atp != NULL && atp->field() != NULL) { |
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977 ciField* field = atp->field(); |
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978 ciSymbol* klass = field->holder()->name(); |
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979 if (field->name() == ciSymbol::cache_field_name() && |
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980 field->holder()->uses_default_loader() && |
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981 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
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982 return true; |
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983 } |
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984 } |
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985 return false; |
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|
986 } |
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|
987 |
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988 // Fetch the base value in the autobox array |
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989 static bool fetch_autobox_base(Compile::AliasType* atp, int& cache_offset) { |
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990 if (atp != NULL && atp->field() != NULL) { |
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991 ciField* field = atp->field(); |
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992 ciSymbol* klass = field->holder()->name(); |
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0
diff
changeset
|
993 if (field->name() == ciSymbol::cache_field_name() && |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
changeset
|
994 field->holder()->uses_default_loader() && |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
995 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
996 assert(field->is_constant(), "what?"); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
997 ciObjArray* array = field->constant_value().as_object()->as_obj_array(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
998 // Fetch the box object at the base of the array and get its value |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
999 ciInstance* box = array->obj_at(0)->as_instance(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1000 ciInstanceKlass* ik = box->klass()->as_instance_klass(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1001 if (ik->nof_nonstatic_fields() == 1) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1002 // This should be true nonstatic_field_at requires calling |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1003 // nof_nonstatic_fields so check it anyway |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1004 ciConstant c = box->field_value(ik->nonstatic_field_at(0)); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1005 cache_offset = c.as_int(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
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|
1006 } |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
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|
1007 return true; |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1008 } |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1009 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1010 return false; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1011 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1012 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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diff
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|
1013 // Returns true if the AliasType refers to the value field of an |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1014 // autobox object. Currently only handles Integer. |
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parents:
0
diff
changeset
|
1015 static bool is_autobox_object(Compile::AliasType* atp) { |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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0
diff
changeset
|
1016 if (atp != NULL && atp->field() != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1017 ciField* field = atp->field(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
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1018 ciSymbol* klass = field->holder()->name(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1019 if (field->name() == ciSymbol::value_name() && |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1020 field->holder()->uses_default_loader() && |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1021 klass == ciSymbol::java_lang_Integer()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1022 return true; |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1023 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1024 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1025 return false; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1026 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1027 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1028 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1029 // We're loading from an object which has autobox behaviour. |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
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1030 // If this object is result of a valueOf call we'll have a phi |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1031 // merging a newly allocated object and a load from the cache. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1032 // We want to replace this load with the original incoming |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1033 // argument to the valueOf call. |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1034 Node* LoadNode::eliminate_autobox(PhaseGVN* phase) { |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1035 Node* base = in(Address)->in(AddPNode::Base); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1036 if (base->is_Phi() && base->req() == 3) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1037 AllocateNode* allocation = NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1038 int allocation_index = -1; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1039 int load_index = -1; |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1040 for (uint i = 1; i < base->req(); i++) { |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1041 allocation = AllocateNode::Ideal_allocation(base->in(i), phase); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1042 if (allocation != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1043 allocation_index = i; |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1044 load_index = 3 - allocation_index; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1045 break; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1046 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1047 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1048 LoadNode* load = NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1049 if (allocation != NULL && base->in(load_index)->is_Load()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1050 load = base->in(load_index)->as_Load(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1051 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1052 if (load != NULL && in(Memory)->is_Phi() && in(Memory)->in(0) == base->in(0)) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1053 // Push the loads from the phi that comes from valueOf up |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1054 // through it to allow elimination of the loads and the recovery |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1055 // of the original value. |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1056 Node* mem_phi = in(Memory); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1057 Node* offset = in(Address)->in(AddPNode::Offset); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1058 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1059 Node* in1 = clone(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1060 Node* in1_addr = in1->in(Address)->clone(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1061 in1_addr->set_req(AddPNode::Base, base->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1062 in1_addr->set_req(AddPNode::Address, base->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1063 in1_addr->set_req(AddPNode::Offset, offset); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1064 in1->set_req(0, base->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1065 in1->set_req(Address, in1_addr); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1066 in1->set_req(Memory, mem_phi->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1067 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1068 Node* in2 = clone(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1069 Node* in2_addr = in2->in(Address)->clone(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1070 in2_addr->set_req(AddPNode::Base, base->in(load_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1071 in2_addr->set_req(AddPNode::Address, base->in(load_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1072 in2_addr->set_req(AddPNode::Offset, offset); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1073 in2->set_req(0, base->in(load_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1074 in2->set_req(Address, in2_addr); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1075 in2->set_req(Memory, mem_phi->in(load_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1076 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1077 in1_addr = phase->transform(in1_addr); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1078 in1 = phase->transform(in1); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1079 in2_addr = phase->transform(in2_addr); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1080 in2 = phase->transform(in2); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1081 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1082 PhiNode* result = PhiNode::make_blank(base->in(0), this); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1083 result->set_req(allocation_index, in1); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1084 result->set_req(load_index, in2); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1085 return result; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1086 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1087 } else if (base->is_Load()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1088 // Eliminate the load of Integer.value for integers from the cache |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1089 // array by deriving the value from the index into the array. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1090 // Capture the offset of the load and then reverse the computation. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1091 Node* load_base = base->in(Address)->in(AddPNode::Base); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1092 if (load_base != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1093 Compile::AliasType* atp = phase->C->alias_type(load_base->adr_type()); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1094 intptr_t cache_offset; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1095 int shift = -1; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1096 Node* cache = NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1097 if (is_autobox_cache(atp)) { |
29
d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
kvn
parents:
17
diff
changeset
|
1098 shift = exact_log2(type2aelembytes(T_OBJECT)); |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1099 cache = AddPNode::Ideal_base_and_offset(load_base->in(Address), phase, cache_offset); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1100 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1101 if (cache != NULL && base->in(Address)->is_AddP()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1102 Node* elements[4]; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1103 int count = base->in(Address)->as_AddP()->unpack_offsets(elements, ARRAY_SIZE(elements)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1104 int cache_low; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1105 if (count > 0 && fetch_autobox_base(atp, cache_low)) { |
ff5961f4c095
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1106 int offset = arrayOopDesc::base_offset_in_bytes(memory_type()) - (cache_low << shift); |
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1107 // Add up all the offsets making of the address of the load |
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1108 Node* result = elements[0]; |
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1109 for (int i = 1; i < count; i++) { |
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1110 result = phase->transform(new (phase->C, 3) AddXNode(result, elements[i])); |
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1111 } |
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1112 // Remove the constant offset from the address and then |
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1113 // remove the scaling of the offset to recover the original index. |
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1114 result = phase->transform(new (phase->C, 3) AddXNode(result, phase->MakeConX(-offset))); |
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1115 if (result->Opcode() == Op_LShiftX && result->in(2) == phase->intcon(shift)) { |
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1116 // Peel the shift off directly but wrap it in a dummy node |
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1117 // since Ideal can't return existing nodes |
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1118 result = new (phase->C, 3) RShiftXNode(result->in(1), phase->intcon(0)); |
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1119 } else { |
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1120 result = new (phase->C, 3) RShiftXNode(result, phase->intcon(shift)); |
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1121 } |
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1122 #ifdef _LP64 |
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1123 result = new (phase->C, 2) ConvL2INode(phase->transform(result)); |
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1124 #endif |
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1125 return result; |
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1126 } |
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1127 } |
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1128 } |
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1129 } |
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1130 return NULL; |
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1131 } |
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1132 |
163 | 1133 //------------------------------split_through_phi------------------------------ |
1134 // Split instance field load through Phi. | |
1135 Node *LoadNode::split_through_phi(PhaseGVN *phase) { | |
1136 Node* mem = in(MemNode::Memory); | |
1137 Node* address = in(MemNode::Address); | |
1138 const TypePtr *addr_t = phase->type(address)->isa_ptr(); | |
1139 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); | |
1140 | |
1141 assert(mem->is_Phi() && (t_oop != NULL) && | |
223 | 1142 t_oop->is_known_instance_field(), "invalide conditions"); |
163 | 1143 |
1144 Node *region = mem->in(0); | |
1145 if (region == NULL) { | |
1146 return NULL; // Wait stable graph | |
1147 } | |
1148 uint cnt = mem->req(); | |
1149 for( uint i = 1; i < cnt; i++ ) { | |
1150 Node *in = mem->in(i); | |
1151 if( in == NULL ) { | |
1152 return NULL; // Wait stable graph | |
1153 } | |
1154 } | |
1155 // Check for loop invariant. | |
1156 if (cnt == 3) { | |
1157 for( uint i = 1; i < cnt; i++ ) { | |
1158 Node *in = mem->in(i); | |
1159 Node* m = MemNode::optimize_memory_chain(in, addr_t, phase); | |
1160 if (m == mem) { | |
1161 set_req(MemNode::Memory, mem->in(cnt - i)); // Skip this phi. | |
1162 return this; | |
1163 } | |
1164 } | |
1165 } | |
1166 // Split through Phi (see original code in loopopts.cpp). | |
1167 assert(phase->C->have_alias_type(addr_t), "instance should have alias type"); | |
1168 | |
1169 // Do nothing here if Identity will find a value | |
1170 // (to avoid infinite chain of value phis generation). | |
1171 if ( !phase->eqv(this, this->Identity(phase)) ) | |
1172 return NULL; | |
1173 | |
1174 // Skip the split if the region dominates some control edge of the address. | |
1175 if (cnt == 3 && !MemNode::all_controls_dominate(address, region)) | |
1176 return NULL; | |
1177 | |
1178 const Type* this_type = this->bottom_type(); | |
1179 int this_index = phase->C->get_alias_index(addr_t); | |
1180 int this_offset = addr_t->offset(); | |
1181 int this_iid = addr_t->is_oopptr()->instance_id(); | |
1182 int wins = 0; | |
1183 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
1184 Node *phi = new (igvn->C, region->req()) PhiNode(region, this_type, NULL, this_iid, this_index, this_offset); | |
1185 for( uint i = 1; i < region->req(); i++ ) { | |
1186 Node *x; | |
1187 Node* the_clone = NULL; | |
1188 if( region->in(i) == phase->C->top() ) { | |
1189 x = phase->C->top(); // Dead path? Use a dead data op | |
1190 } else { | |
1191 x = this->clone(); // Else clone up the data op | |
1192 the_clone = x; // Remember for possible deletion. | |
1193 // Alter data node to use pre-phi inputs | |
1194 if( this->in(0) == region ) { | |
1195 x->set_req( 0, region->in(i) ); | |
1196 } else { | |
1197 x->set_req( 0, NULL ); | |
1198 } | |
1199 for( uint j = 1; j < this->req(); j++ ) { | |
1200 Node *in = this->in(j); | |
1201 if( in->is_Phi() && in->in(0) == region ) | |
1202 x->set_req( j, in->in(i) ); // Use pre-Phi input for the clone | |
1203 } | |
1204 } | |
1205 // Check for a 'win' on some paths | |
1206 const Type *t = x->Value(igvn); | |
1207 | |
1208 bool singleton = t->singleton(); | |
1209 | |
1210 // See comments in PhaseIdealLoop::split_thru_phi(). | |
1211 if( singleton && t == Type::TOP ) { | |
1212 singleton &= region->is_Loop() && (i != LoopNode::EntryControl); | |
1213 } | |
1214 | |
1215 if( singleton ) { | |
1216 wins++; | |
1217 x = igvn->makecon(t); | |
1218 } else { | |
1219 // We now call Identity to try to simplify the cloned node. | |
1220 // Note that some Identity methods call phase->type(this). | |
1221 // Make sure that the type array is big enough for | |
1222 // our new node, even though we may throw the node away. | |
1223 // (This tweaking with igvn only works because x is a new node.) | |
1224 igvn->set_type(x, t); | |
1225 Node *y = x->Identity(igvn); | |
1226 if( y != x ) { | |
1227 wins++; | |
1228 x = y; | |
1229 } else { | |
1230 y = igvn->hash_find(x); | |
1231 if( y ) { | |
1232 wins++; | |
1233 x = y; | |
1234 } else { | |
1235 // Else x is a new node we are keeping | |
1236 // We do not need register_new_node_with_optimizer | |
1237 // because set_type has already been called. | |
1238 igvn->_worklist.push(x); | |
1239 } | |
1240 } | |
1241 } | |
1242 if (x != the_clone && the_clone != NULL) | |
1243 igvn->remove_dead_node(the_clone); | |
1244 phi->set_req(i, x); | |
1245 } | |
1246 if( wins > 0 ) { | |
1247 // Record Phi | |
1248 igvn->register_new_node_with_optimizer(phi); | |
1249 return phi; | |
1250 } | |
1251 igvn->remove_dead_node(phi); | |
1252 return NULL; | |
1253 } | |
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1254 |
0 | 1255 //------------------------------Ideal------------------------------------------ |
1256 // If the load is from Field memory and the pointer is non-null, we can | |
1257 // zero out the control input. | |
1258 // If the offset is constant and the base is an object allocation, | |
1259 // try to hook me up to the exact initializing store. | |
1260 Node *LoadNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1261 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
1262 if (p) return (p == NodeSentinel) ? NULL : p; | |
1263 | |
1264 Node* ctrl = in(MemNode::Control); | |
1265 Node* address = in(MemNode::Address); | |
1266 | |
1267 // Skip up past a SafePoint control. Cannot do this for Stores because | |
1268 // pointer stores & cardmarks must stay on the same side of a SafePoint. | |
1269 if( ctrl != NULL && ctrl->Opcode() == Op_SafePoint && | |
1270 phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw ) { | |
1271 ctrl = ctrl->in(0); | |
1272 set_req(MemNode::Control,ctrl); | |
1273 } | |
1274 | |
1275 // Check for useless control edge in some common special cases | |
1276 if (in(MemNode::Control) != NULL) { | |
1277 intptr_t ignore = 0; | |
1278 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); | |
1279 if (base != NULL | |
1280 && phase->type(base)->higher_equal(TypePtr::NOTNULL) | |
119
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1281 && all_controls_dominate(base, phase->C->start())) { |
0 | 1282 // A method-invariant, non-null address (constant or 'this' argument). |
1283 set_req(MemNode::Control, NULL); | |
1284 } | |
1285 } | |
1286 | |
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1287 if (EliminateAutoBox && can_reshape && in(Address)->is_AddP()) { |
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1288 Node* base = in(Address)->in(AddPNode::Base); |
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1289 if (base != NULL) { |
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1290 Compile::AliasType* atp = phase->C->alias_type(adr_type()); |
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1291 if (is_autobox_object(atp)) { |
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1292 Node* result = eliminate_autobox(phase); |
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1293 if (result != NULL) return result; |
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1294 } |
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1295 } |
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1296 } |
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1297 |
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1298 Node* mem = in(MemNode::Memory); |
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1299 const TypePtr *addr_t = phase->type(address)->isa_ptr(); |
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1300 |
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1301 if (addr_t != NULL) { |
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1302 // try to optimize our memory input |
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1303 Node* opt_mem = MemNode::optimize_memory_chain(mem, addr_t, phase); |
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1304 if (opt_mem != mem) { |
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1305 set_req(MemNode::Memory, opt_mem); |
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1306 return this; |
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1307 } |
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1308 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); |
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1309 if (can_reshape && opt_mem->is_Phi() && |
223 | 1310 (t_oop != NULL) && t_oop->is_known_instance_field()) { |
163 | 1311 // Split instance field load through Phi. |
1312 Node* result = split_through_phi(phase); | |
1313 if (result != NULL) return result; | |
74
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1314 } |
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1315 } |
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1316 |
0 | 1317 // Check for prior store with a different base or offset; make Load |
1318 // independent. Skip through any number of them. Bail out if the stores | |
1319 // are in an endless dead cycle and report no progress. This is a key | |
1320 // transform for Reflection. However, if after skipping through the Stores | |
1321 // we can't then fold up against a prior store do NOT do the transform as | |
1322 // this amounts to using the 'Oracle' model of aliasing. It leaves the same | |
1323 // array memory alive twice: once for the hoisted Load and again after the | |
1324 // bypassed Store. This situation only works if EVERYBODY who does | |
1325 // anti-dependence work knows how to bypass. I.e. we need all | |
1326 // anti-dependence checks to ask the same Oracle. Right now, that Oracle is | |
1327 // the alias index stuff. So instead, peek through Stores and IFF we can | |
1328 // fold up, do so. | |
1329 Node* prev_mem = find_previous_store(phase); | |
1330 // Steps (a), (b): Walk past independent stores to find an exact match. | |
1331 if (prev_mem != NULL && prev_mem != in(MemNode::Memory)) { | |
1332 // (c) See if we can fold up on the spot, but don't fold up here. | |
1333 // Fold-up might require truncation (for LoadB/LoadS/LoadC) or | |
1334 // just return a prior value, which is done by Identity calls. | |
1335 if (can_see_stored_value(prev_mem, phase)) { | |
1336 // Make ready for step (d): | |
1337 set_req(MemNode::Memory, prev_mem); | |
1338 return this; | |
1339 } | |
1340 } | |
1341 | |
1342 return NULL; // No further progress | |
1343 } | |
1344 | |
1345 // Helper to recognize certain Klass fields which are invariant across | |
1346 // some group of array types (e.g., int[] or all T[] where T < Object). | |
1347 const Type* | |
1348 LoadNode::load_array_final_field(const TypeKlassPtr *tkls, | |
1349 ciKlass* klass) const { | |
1350 if (tkls->offset() == Klass::modifier_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1351 // The field is Klass::_modifier_flags. Return its (constant) value. | |
1352 // (Folds up the 2nd indirection in aClassConstant.getModifiers().) | |
1353 assert(this->Opcode() == Op_LoadI, "must load an int from _modifier_flags"); | |
1354 return TypeInt::make(klass->modifier_flags()); | |
1355 } | |
1356 if (tkls->offset() == Klass::access_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1357 // The field is Klass::_access_flags. Return its (constant) value. | |
1358 // (Folds up the 2nd indirection in Reflection.getClassAccessFlags(aClassConstant).) | |
1359 assert(this->Opcode() == Op_LoadI, "must load an int from _access_flags"); | |
1360 return TypeInt::make(klass->access_flags()); | |
1361 } | |
1362 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1363 // The field is Klass::_layout_helper. Return its constant value if known. | |
1364 assert(this->Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1365 return TypeInt::make(klass->layout_helper()); | |
1366 } | |
1367 | |
1368 // No match. | |
1369 return NULL; | |
1370 } | |
1371 | |
1372 //------------------------------Value----------------------------------------- | |
1373 const Type *LoadNode::Value( PhaseTransform *phase ) const { | |
1374 // Either input is TOP ==> the result is TOP | |
1375 Node* mem = in(MemNode::Memory); | |
1376 const Type *t1 = phase->type(mem); | |
1377 if (t1 == Type::TOP) return Type::TOP; | |
1378 Node* adr = in(MemNode::Address); | |
1379 const TypePtr* tp = phase->type(adr)->isa_ptr(); | |
1380 if (tp == NULL || tp->empty()) return Type::TOP; | |
1381 int off = tp->offset(); | |
1382 assert(off != Type::OffsetTop, "case covered by TypePtr::empty"); | |
1383 | |
1384 // Try to guess loaded type from pointer type | |
1385 if (tp->base() == Type::AryPtr) { | |
1386 const Type *t = tp->is_aryptr()->elem(); | |
1387 // Don't do this for integer types. There is only potential profit if | |
1388 // the element type t is lower than _type; that is, for int types, if _type is | |
1389 // more restrictive than t. This only happens here if one is short and the other | |
1390 // char (both 16 bits), and in those cases we've made an intentional decision | |
1391 // to use one kind of load over the other. See AndINode::Ideal and 4965907. | |
1392 // Also, do not try to narrow the type for a LoadKlass, regardless of offset. | |
1393 // | |
1394 // Yes, it is possible to encounter an expression like (LoadKlass p1:(AddP x x 8)) | |
1395 // where the _gvn.type of the AddP is wider than 8. This occurs when an earlier | |
1396 // copy p0 of (AddP x x 8) has been proven equal to p1, and the p0 has been | |
1397 // subsumed by p1. If p1 is on the worklist but has not yet been re-transformed, | |
1398 // it is possible that p1 will have a type like Foo*[int+]:NotNull*+any. | |
1399 // In fact, that could have been the original type of p1, and p1 could have | |
1400 // had an original form like p1:(AddP x x (LShiftL quux 3)), where the | |
1401 // expression (LShiftL quux 3) independently optimized to the constant 8. | |
1402 if ((t->isa_int() == NULL) && (t->isa_long() == NULL) | |
1403 && Opcode() != Op_LoadKlass) { | |
1404 // t might actually be lower than _type, if _type is a unique | |
1405 // concrete subclass of abstract class t. | |
1406 // Make sure the reference is not into the header, by comparing | |
1407 // the offset against the offset of the start of the array's data. | |
1408 // Different array types begin at slightly different offsets (12 vs. 16). | |
1409 // We choose T_BYTE as an example base type that is least restrictive | |
1410 // as to alignment, which will therefore produce the smallest | |
1411 // possible base offset. | |
1412 const int min_base_off = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
1413 if ((uint)off >= (uint)min_base_off) { // is the offset beyond the header? | |
1414 const Type* jt = t->join(_type); | |
1415 // In any case, do not allow the join, per se, to empty out the type. | |
1416 if (jt->empty() && !t->empty()) { | |
1417 // This can happen if a interface-typed array narrows to a class type. | |
1418 jt = _type; | |
1419 } | |
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1420 |
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1421 if (EliminateAutoBox) { |
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1422 // The pointers in the autobox arrays are always non-null |
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1423 Node* base = in(Address)->in(AddPNode::Base); |
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1424 if (base != NULL) { |
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1425 Compile::AliasType* atp = phase->C->alias_type(base->adr_type()); |
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1426 if (is_autobox_cache(atp)) { |
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1427 return jt->join(TypePtr::NOTNULL)->is_ptr(); |
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1428 } |
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1429 } |
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1430 } |
0 | 1431 return jt; |
1432 } | |
1433 } | |
1434 } else if (tp->base() == Type::InstPtr) { | |
1435 assert( off != Type::OffsetBot || | |
1436 // arrays can be cast to Objects | |
1437 tp->is_oopptr()->klass()->is_java_lang_Object() || | |
1438 // unsafe field access may not have a constant offset | |
1439 phase->C->has_unsafe_access(), | |
1440 "Field accesses must be precise" ); | |
1441 // For oop loads, we expect the _type to be precise | |
1442 } else if (tp->base() == Type::KlassPtr) { | |
1443 assert( off != Type::OffsetBot || | |
1444 // arrays can be cast to Objects | |
1445 tp->is_klassptr()->klass()->is_java_lang_Object() || | |
1446 // also allow array-loading from the primary supertype | |
1447 // array during subtype checks | |
1448 Opcode() == Op_LoadKlass, | |
1449 "Field accesses must be precise" ); | |
1450 // For klass/static loads, we expect the _type to be precise | |
1451 } | |
1452 | |
1453 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1454 if (tkls != NULL && !StressReflectiveCode) { | |
1455 ciKlass* klass = tkls->klass(); | |
1456 if (klass->is_loaded() && tkls->klass_is_exact()) { | |
1457 // We are loading a field from a Klass metaobject whose identity | |
1458 // is known at compile time (the type is "exact" or "precise"). | |
1459 // Check for fields we know are maintained as constants by the VM. | |
1460 if (tkls->offset() == Klass::super_check_offset_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1461 // The field is Klass::_super_check_offset. Return its (constant) value. | |
1462 // (Folds up type checking code.) | |
1463 assert(Opcode() == Op_LoadI, "must load an int from _super_check_offset"); | |
1464 return TypeInt::make(klass->super_check_offset()); | |
1465 } | |
1466 // Compute index into primary_supers array | |
1467 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
1468 // Check for overflowing; use unsigned compare to handle the negative case. | |
1469 if( depth < ciKlass::primary_super_limit() ) { | |
1470 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1471 // (Folds up type checking code.) | |
1472 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1473 ciKlass *ss = klass->super_of_depth(depth); | |
1474 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1475 } | |
1476 const Type* aift = load_array_final_field(tkls, klass); | |
1477 if (aift != NULL) return aift; | |
1478 if (tkls->offset() == in_bytes(arrayKlass::component_mirror_offset()) + (int)sizeof(oopDesc) | |
1479 && klass->is_array_klass()) { | |
1480 // The field is arrayKlass::_component_mirror. Return its (constant) value. | |
1481 // (Folds up aClassConstant.getComponentType, common in Arrays.copyOf.) | |
1482 assert(Opcode() == Op_LoadP, "must load an oop from _component_mirror"); | |
1483 return TypeInstPtr::make(klass->as_array_klass()->component_mirror()); | |
1484 } | |
1485 if (tkls->offset() == Klass::java_mirror_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1486 // The field is Klass::_java_mirror. Return its (constant) value. | |
1487 // (Folds up the 2nd indirection in anObjConstant.getClass().) | |
1488 assert(Opcode() == Op_LoadP, "must load an oop from _java_mirror"); | |
1489 return TypeInstPtr::make(klass->java_mirror()); | |
1490 } | |
1491 } | |
1492 | |
1493 // We can still check if we are loading from the primary_supers array at a | |
1494 // shallow enough depth. Even though the klass is not exact, entries less | |
1495 // than or equal to its super depth are correct. | |
1496 if (klass->is_loaded() ) { | |
1497 ciType *inner = klass->klass(); | |
1498 while( inner->is_obj_array_klass() ) | |
1499 inner = inner->as_obj_array_klass()->base_element_type(); | |
1500 if( inner->is_instance_klass() && | |
1501 !inner->as_instance_klass()->flags().is_interface() ) { | |
1502 // Compute index into primary_supers array | |
1503 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
1504 // Check for overflowing; use unsigned compare to handle the negative case. | |
1505 if( depth < ciKlass::primary_super_limit() && | |
1506 depth <= klass->super_depth() ) { // allow self-depth checks to handle self-check case | |
1507 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1508 // (Folds up type checking code.) | |
1509 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1510 ciKlass *ss = klass->super_of_depth(depth); | |
1511 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1512 } | |
1513 } | |
1514 } | |
1515 | |
1516 // If the type is enough to determine that the thing is not an array, | |
1517 // we can give the layout_helper a positive interval type. | |
1518 // This will help short-circuit some reflective code. | |
1519 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc) | |
1520 && !klass->is_array_klass() // not directly typed as an array | |
1521 && !klass->is_interface() // specifically not Serializable & Cloneable | |
1522 && !klass->is_java_lang_Object() // not the supertype of all T[] | |
1523 ) { | |
1524 // Note: When interfaces are reliable, we can narrow the interface | |
1525 // test to (klass != Serializable && klass != Cloneable). | |
1526 assert(Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1527 jint min_size = Klass::instance_layout_helper(oopDesc::header_size(), false); | |
1528 // The key property of this type is that it folds up tests | |
1529 // for array-ness, since it proves that the layout_helper is positive. | |
1530 // Thus, a generic value like the basic object layout helper works fine. | |
1531 return TypeInt::make(min_size, max_jint, Type::WidenMin); | |
1532 } | |
1533 } | |
1534 | |
1535 // If we are loading from a freshly-allocated object, produce a zero, | |
1536 // if the load is provably beyond the header of the object. | |
1537 // (Also allow a variable load from a fresh array to produce zero.) | |
1538 if (ReduceFieldZeroing) { | |
1539 Node* value = can_see_stored_value(mem,phase); | |
1540 if (value != NULL && value->is_Con()) | |
1541 return value->bottom_type(); | |
1542 } | |
1543 | |
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1544 const TypeOopPtr *tinst = tp->isa_oopptr(); |
223 | 1545 if (tinst != NULL && tinst->is_known_instance_field()) { |
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1546 // If we have an instance type and our memory input is the |
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1547 // programs's initial memory state, there is no matching store, |
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1548 // so just return a zero of the appropriate type |
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1549 Node *mem = in(MemNode::Memory); |
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1550 if (mem->is_Parm() && mem->in(0)->is_Start()) { |
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1551 assert(mem->as_Parm()->_con == TypeFunc::Memory, "must be memory Parm"); |
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1552 return Type::get_zero_type(_type->basic_type()); |
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1553 } |
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1554 } |
0 | 1555 return _type; |
1556 } | |
1557 | |
1558 //------------------------------match_edge------------------------------------- | |
1559 // Do we Match on this edge index or not? Match only the address. | |
1560 uint LoadNode::match_edge(uint idx) const { | |
1561 return idx == MemNode::Address; | |
1562 } | |
1563 | |
1564 //--------------------------LoadBNode::Ideal-------------------------------------- | |
1565 // | |
1566 // If the previous store is to the same address as this load, | |
1567 // and the value stored was larger than a byte, replace this load | |
1568 // with the value stored truncated to a byte. If no truncation is | |
1569 // needed, the replacement is done in LoadNode::Identity(). | |
1570 // | |
1571 Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1572 Node* mem = in(MemNode::Memory); | |
1573 Node* value = can_see_stored_value(mem,phase); | |
1574 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1575 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(24)) ); | |
1576 return new (phase->C, 3) RShiftINode(result, phase->intcon(24)); | |
1577 } | |
1578 // Identity call will handle the case where truncation is not needed. | |
1579 return LoadNode::Ideal(phase, can_reshape); | |
1580 } | |
1581 | |
1582 //--------------------------LoadCNode::Ideal-------------------------------------- | |
1583 // | |
1584 // If the previous store is to the same address as this load, | |
1585 // and the value stored was larger than a char, replace this load | |
1586 // with the value stored truncated to a char. If no truncation is | |
1587 // needed, the replacement is done in LoadNode::Identity(). | |
1588 // | |
1589 Node *LoadCNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1590 Node* mem = in(MemNode::Memory); | |
1591 Node* value = can_see_stored_value(mem,phase); | |
1592 if( value && !phase->type(value)->higher_equal( _type ) ) | |
1593 return new (phase->C, 3) AndINode(value,phase->intcon(0xFFFF)); | |
1594 // Identity call will handle the case where truncation is not needed. | |
1595 return LoadNode::Ideal(phase, can_reshape); | |
1596 } | |
1597 | |
1598 //--------------------------LoadSNode::Ideal-------------------------------------- | |
1599 // | |
1600 // If the previous store is to the same address as this load, | |
1601 // and the value stored was larger than a short, replace this load | |
1602 // with the value stored truncated to a short. If no truncation is | |
1603 // needed, the replacement is done in LoadNode::Identity(). | |
1604 // | |
1605 Node *LoadSNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1606 Node* mem = in(MemNode::Memory); | |
1607 Node* value = can_see_stored_value(mem,phase); | |
1608 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1609 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(16)) ); | |
1610 return new (phase->C, 3) RShiftINode(result, phase->intcon(16)); | |
1611 } | |
1612 // Identity call will handle the case where truncation is not needed. | |
1613 return LoadNode::Ideal(phase, can_reshape); | |
1614 } | |
1615 | |
1616 //============================================================================= | |
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1617 //----------------------------LoadKlassNode::make------------------------------ |
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1618 // Polymorphic factory method: |
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1619 Node *LoadKlassNode::make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, const TypeKlassPtr *tk ) { |
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1620 Compile* C = gvn.C; |
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1621 Node *ctl = NULL; |
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1622 // sanity check the alias category against the created node type |
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1623 const TypeOopPtr *adr_type = adr->bottom_type()->isa_oopptr(); |
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1624 assert(adr_type != NULL, "expecting TypeOopPtr"); |
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1625 #ifdef _LP64 |
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1626 if (adr_type->is_ptr_to_narrowoop()) { |
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1627 Node* load_klass = gvn.transform(new (C, 3) LoadNKlassNode(ctl, mem, adr, at, tk->make_narrowoop())); |
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1628 return new (C, 2) DecodeNNode(load_klass, load_klass->bottom_type()->make_ptr()); |
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1629 } |
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1630 #endif |
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1631 assert(!adr_type->is_ptr_to_narrowoop(), "should have got back a narrow oop"); |
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1632 return new (C, 3) LoadKlassNode(ctl, mem, adr, at, tk); |
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1633 } |
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1634 |
0 | 1635 //------------------------------Value------------------------------------------ |
1636 const Type *LoadKlassNode::Value( PhaseTransform *phase ) const { | |
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1637 return klass_value_common(phase); |
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1638 } |
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1639 |
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1640 const Type *LoadNode::klass_value_common( PhaseTransform *phase ) const { |
0 | 1641 // Either input is TOP ==> the result is TOP |
1642 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1643 if (t1 == Type::TOP) return Type::TOP; | |
1644 Node *adr = in(MemNode::Address); | |
1645 const Type *t2 = phase->type( adr ); | |
1646 if (t2 == Type::TOP) return Type::TOP; | |
1647 const TypePtr *tp = t2->is_ptr(); | |
1648 if (TypePtr::above_centerline(tp->ptr()) || | |
1649 tp->ptr() == TypePtr::Null) return Type::TOP; | |
1650 | |
1651 // Return a more precise klass, if possible | |
1652 const TypeInstPtr *tinst = tp->isa_instptr(); | |
1653 if (tinst != NULL) { | |
1654 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
1655 int offset = tinst->offset(); | |
1656 if (ik == phase->C->env()->Class_klass() | |
1657 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
1658 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
1659 // We are loading a special hidden field from a Class mirror object, | |
1660 // the field which points to the VM's Klass metaobject. | |
1661 ciType* t = tinst->java_mirror_type(); | |
1662 // java_mirror_type returns non-null for compile-time Class constants. | |
1663 if (t != NULL) { | |
1664 // constant oop => constant klass | |
1665 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
1666 return TypeKlassPtr::make(ciArrayKlass::make(t)); | |
1667 } | |
1668 if (!t->is_klass()) { | |
1669 // a primitive Class (e.g., int.class) has NULL for a klass field | |
1670 return TypePtr::NULL_PTR; | |
1671 } | |
1672 // (Folds up the 1st indirection in aClassConstant.getModifiers().) | |
1673 return TypeKlassPtr::make(t->as_klass()); | |
1674 } | |
1675 // non-constant mirror, so we can't tell what's going on | |
1676 } | |
1677 if( !ik->is_loaded() ) | |
1678 return _type; // Bail out if not loaded | |
1679 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1680 if (tinst->klass_is_exact()) { | |
1681 return TypeKlassPtr::make(ik); | |
1682 } | |
1683 // See if we can become precise: no subklasses and no interface | |
1684 // (Note: We need to support verified interfaces.) | |
1685 if (!ik->is_interface() && !ik->has_subklass()) { | |
1686 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1687 // Add a dependence; if any subclass added we need to recompile | |
1688 if (!ik->is_final()) { | |
1689 // %%% should use stronger assert_unique_concrete_subtype instead | |
1690 phase->C->dependencies()->assert_leaf_type(ik); | |
1691 } | |
1692 // Return precise klass | |
1693 return TypeKlassPtr::make(ik); | |
1694 } | |
1695 | |
1696 // Return root of possible klass | |
1697 return TypeKlassPtr::make(TypePtr::NotNull, ik, 0/*offset*/); | |
1698 } | |
1699 } | |
1700 | |
1701 // Check for loading klass from an array | |
1702 const TypeAryPtr *tary = tp->isa_aryptr(); | |
1703 if( tary != NULL ) { | |
1704 ciKlass *tary_klass = tary->klass(); | |
1705 if (tary_klass != NULL // can be NULL when at BOTTOM or TOP | |
1706 && tary->offset() == oopDesc::klass_offset_in_bytes()) { | |
1707 if (tary->klass_is_exact()) { | |
1708 return TypeKlassPtr::make(tary_klass); | |
1709 } | |
1710 ciArrayKlass *ak = tary->klass()->as_array_klass(); | |
1711 // If the klass is an object array, we defer the question to the | |
1712 // array component klass. | |
1713 if( ak->is_obj_array_klass() ) { | |
1714 assert( ak->is_loaded(), "" ); | |
1715 ciKlass *base_k = ak->as_obj_array_klass()->base_element_klass(); | |
1716 if( base_k->is_loaded() && base_k->is_instance_klass() ) { | |
1717 ciInstanceKlass* ik = base_k->as_instance_klass(); | |
1718 // See if we can become precise: no subklasses and no interface | |
1719 if (!ik->is_interface() && !ik->has_subklass()) { | |
1720 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1721 // Add a dependence; if any subclass added we need to recompile | |
1722 if (!ik->is_final()) { | |
1723 phase->C->dependencies()->assert_leaf_type(ik); | |
1724 } | |
1725 // Return precise array klass | |
1726 return TypeKlassPtr::make(ak); | |
1727 } | |
1728 } | |
1729 return TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
1730 } else { // Found a type-array? | |
1731 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1732 assert( ak->is_type_array_klass(), "" ); | |
1733 return TypeKlassPtr::make(ak); // These are always precise | |
1734 } | |
1735 } | |
1736 } | |
1737 | |
1738 // Check for loading klass from an array klass | |
1739 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1740 if (tkls != NULL && !StressReflectiveCode) { | |
1741 ciKlass* klass = tkls->klass(); | |
1742 if( !klass->is_loaded() ) | |
1743 return _type; // Bail out if not loaded | |
1744 if( klass->is_obj_array_klass() && | |
1745 (uint)tkls->offset() == objArrayKlass::element_klass_offset_in_bytes() + sizeof(oopDesc)) { | |
1746 ciKlass* elem = klass->as_obj_array_klass()->element_klass(); | |
1747 // // Always returning precise element type is incorrect, | |
1748 // // e.g., element type could be object and array may contain strings | |
1749 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0); | |
1750 | |
1751 // The array's TypeKlassPtr was declared 'precise' or 'not precise' | |
1752 // according to the element type's subclassing. | |
1753 return TypeKlassPtr::make(tkls->ptr(), elem, 0/*offset*/); | |
1754 } | |
1755 if( klass->is_instance_klass() && tkls->klass_is_exact() && | |
1756 (uint)tkls->offset() == Klass::super_offset_in_bytes() + sizeof(oopDesc)) { | |
1757 ciKlass* sup = klass->as_instance_klass()->super(); | |
1758 // The field is Klass::_super. Return its (constant) value. | |
1759 // (Folds up the 2nd indirection in aClassConstant.getSuperClass().) | |
1760 return sup ? TypeKlassPtr::make(sup) : TypePtr::NULL_PTR; | |
1761 } | |
1762 } | |
1763 | |
1764 // Bailout case | |
1765 return LoadNode::Value(phase); | |
1766 } | |
1767 | |
1768 //------------------------------Identity--------------------------------------- | |
1769 // To clean up reflective code, simplify k.java_mirror.as_klass to plain k. | |
1770 // Also feed through the klass in Allocate(...klass...)._klass. | |
1771 Node* LoadKlassNode::Identity( PhaseTransform *phase ) { | |
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1772 return klass_identity_common(phase); |
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1773 } |
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1774 |
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1775 Node* LoadNode::klass_identity_common(PhaseTransform *phase ) { |
0 | 1776 Node* x = LoadNode::Identity(phase); |
1777 if (x != this) return x; | |
1778 | |
1779 // Take apart the address into an oop and and offset. | |
1780 // Return 'this' if we cannot. | |
1781 Node* adr = in(MemNode::Address); | |
1782 intptr_t offset = 0; | |
1783 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
1784 if (base == NULL) return this; | |
1785 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr(); | |
1786 if (toop == NULL) return this; | |
1787 | |
1788 // We can fetch the klass directly through an AllocateNode. | |
1789 // This works even if the klass is not constant (clone or newArray). | |
1790 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1791 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase); | |
1792 if (allocated_klass != NULL) { | |
1793 return allocated_klass; | |
1794 } | |
1795 } | |
1796 | |
1797 // Simplify k.java_mirror.as_klass to plain k, where k is a klassOop. | |
1798 // Simplify ak.component_mirror.array_klass to plain ak, ak an arrayKlass. | |
1799 // See inline_native_Class_query for occurrences of these patterns. | |
1800 // Java Example: x.getClass().isAssignableFrom(y) | |
1801 // Java Example: Array.newInstance(x.getClass().getComponentType(), n) | |
1802 // | |
1803 // This improves reflective code, often making the Class | |
1804 // mirror go completely dead. (Current exception: Class | |
1805 // mirrors may appear in debug info, but we could clean them out by | |
1806 // introducing a new debug info operator for klassOop.java_mirror). | |
1807 if (toop->isa_instptr() && toop->klass() == phase->C->env()->Class_klass() | |
1808 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
1809 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
1810 // We are loading a special hidden field from a Class mirror, | |
1811 // the field which points to its Klass or arrayKlass metaobject. | |
1812 if (base->is_Load()) { | |
1813 Node* adr2 = base->in(MemNode::Address); | |
1814 const TypeKlassPtr* tkls = phase->type(adr2)->isa_klassptr(); | |
1815 if (tkls != NULL && !tkls->empty() | |
1816 && (tkls->klass()->is_instance_klass() || | |
1817 tkls->klass()->is_array_klass()) | |
1818 && adr2->is_AddP() | |
1819 ) { | |
1820 int mirror_field = Klass::java_mirror_offset_in_bytes(); | |
1821 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
1822 mirror_field = in_bytes(arrayKlass::component_mirror_offset()); | |
1823 } | |
1824 if (tkls->offset() == mirror_field + (int)sizeof(oopDesc)) { | |
1825 return adr2->in(AddPNode::Base); | |
1826 } | |
1827 } | |
1828 } | |
1829 } | |
1830 | |
1831 return this; | |
1832 } | |
1833 | |
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1834 |
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1835 //------------------------------Value------------------------------------------ |
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1836 const Type *LoadNKlassNode::Value( PhaseTransform *phase ) const { |
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1837 const Type *t = klass_value_common(phase); |
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1838 if (t == Type::TOP) |
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1839 return t; |
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1840 |
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1841 return t->make_narrowoop(); |
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1842 } |
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1843 |
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1844 //------------------------------Identity--------------------------------------- |
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1845 // To clean up reflective code, simplify k.java_mirror.as_klass to narrow k. |
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1846 // Also feed through the klass in Allocate(...klass...)._klass. |
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1847 Node* LoadNKlassNode::Identity( PhaseTransform *phase ) { |
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1848 Node *x = klass_identity_common(phase); |
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1849 |
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1850 const Type *t = phase->type( x ); |
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1851 if( t == Type::TOP ) return x; |
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1852 if( t->isa_narrowoop()) return x; |
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1853 |
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1854 return phase->transform(new (phase->C, 2) EncodePNode(x, t->make_narrowoop())); |
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1855 } |
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1856 |
0 | 1857 //------------------------------Value----------------------------------------- |
1858 const Type *LoadRangeNode::Value( PhaseTransform *phase ) const { | |
1859 // Either input is TOP ==> the result is TOP | |
1860 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1861 if( t1 == Type::TOP ) return Type::TOP; | |
1862 Node *adr = in(MemNode::Address); | |
1863 const Type *t2 = phase->type( adr ); | |
1864 if( t2 == Type::TOP ) return Type::TOP; | |
1865 const TypePtr *tp = t2->is_ptr(); | |
1866 if (TypePtr::above_centerline(tp->ptr())) return Type::TOP; | |
1867 const TypeAryPtr *tap = tp->isa_aryptr(); | |
1868 if( !tap ) return _type; | |
1869 return tap->size(); | |
1870 } | |
1871 | |
1872 //------------------------------Identity--------------------------------------- | |
1873 // Feed through the length in AllocateArray(...length...)._length. | |
1874 Node* LoadRangeNode::Identity( PhaseTransform *phase ) { | |
1875 Node* x = LoadINode::Identity(phase); | |
1876 if (x != this) return x; | |
1877 | |
1878 // Take apart the address into an oop and and offset. | |
1879 // Return 'this' if we cannot. | |
1880 Node* adr = in(MemNode::Address); | |
1881 intptr_t offset = 0; | |
1882 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
1883 if (base == NULL) return this; | |
1884 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); | |
1885 if (tary == NULL) return this; | |
1886 | |
1887 // We can fetch the length directly through an AllocateArrayNode. | |
1888 // This works even if the length is not constant (clone or newArray). | |
1889 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
1890 Node* allocated_length = AllocateArrayNode::Ideal_length(base, phase); | |
1891 if (allocated_length != NULL) { | |
1892 return allocated_length; | |
1893 } | |
1894 } | |
1895 | |
1896 return this; | |
1897 | |
1898 } | |
1899 //============================================================================= | |
1900 //---------------------------StoreNode::make----------------------------------- | |
1901 // Polymorphic factory method: | |
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1902 StoreNode* StoreNode::make( PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, BasicType bt ) { |
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1903 Compile* C = gvn.C; |
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1904 |
0 | 1905 switch (bt) { |
1906 case T_BOOLEAN: | |
1907 case T_BYTE: return new (C, 4) StoreBNode(ctl, mem, adr, adr_type, val); | |
1908 case T_INT: return new (C, 4) StoreINode(ctl, mem, adr, adr_type, val); | |
1909 case T_CHAR: | |
1910 case T_SHORT: return new (C, 4) StoreCNode(ctl, mem, adr, adr_type, val); | |
1911 case T_LONG: return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val); | |
1912 case T_FLOAT: return new (C, 4) StoreFNode(ctl, mem, adr, adr_type, val); | |
1913 case T_DOUBLE: return new (C, 4) StoreDNode(ctl, mem, adr, adr_type, val); | |
1914 case T_ADDRESS: | |
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1915 case T_OBJECT: |
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1916 #ifdef _LP64 |
163 | 1917 if (adr->bottom_type()->is_ptr_to_narrowoop() || |
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1918 (UseCompressedOops && val->bottom_type()->isa_klassptr() && |
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1919 adr->bottom_type()->isa_rawptr())) { |
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1920 val = gvn.transform(new (C, 2) EncodePNode(val, val->bottom_type()->make_narrowoop())); |
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1921 return new (C, 4) StoreNNode(ctl, mem, adr, adr_type, val); |
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1922 } else |
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1923 #endif |
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1924 { |
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1925 return new (C, 4) StorePNode(ctl, mem, adr, adr_type, val); |
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1926 } |
0 | 1927 } |
1928 ShouldNotReachHere(); | |
1929 return (StoreNode*)NULL; | |
1930 } | |
1931 | |
1932 StoreLNode* StoreLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val) { | |
1933 bool require_atomic = true; | |
1934 return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val, require_atomic); | |
1935 } | |
1936 | |
1937 | |
1938 //--------------------------bottom_type---------------------------------------- | |
1939 const Type *StoreNode::bottom_type() const { | |
1940 return Type::MEMORY; | |
1941 } | |
1942 | |
1943 //------------------------------hash------------------------------------------- | |
1944 uint StoreNode::hash() const { | |
1945 // unroll addition of interesting fields | |
1946 //return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address) + (uintptr_t)in(ValueIn); | |
1947 | |
1948 // Since they are not commoned, do not hash them: | |
1949 return NO_HASH; | |
1950 } | |
1951 | |
1952 //------------------------------Ideal------------------------------------------ | |
1953 // Change back-to-back Store(, p, x) -> Store(m, p, y) to Store(m, p, x). | |
1954 // When a store immediately follows a relevant allocation/initialization, | |
1955 // try to capture it into the initialization, or hoist it above. | |
1956 Node *StoreNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1957 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
1958 if (p) return (p == NodeSentinel) ? NULL : p; | |
1959 | |
1960 Node* mem = in(MemNode::Memory); | |
1961 Node* address = in(MemNode::Address); | |
1962 | |
1963 // Back-to-back stores to same address? Fold em up. | |
1964 // Generally unsafe if I have intervening uses... | |
1965 if (mem->is_Store() && phase->eqv_uncast(mem->in(MemNode::Address), address)) { | |
1966 // Looking at a dead closed cycle of memory? | |
1967 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal"); | |
1968 | |
1969 assert(Opcode() == mem->Opcode() || | |
1970 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw, | |
1971 "no mismatched stores, except on raw memory"); | |
1972 | |
1973 if (mem->outcnt() == 1 && // check for intervening uses | |
1974 mem->as_Store()->memory_size() <= this->memory_size()) { | |
1975 // If anybody other than 'this' uses 'mem', we cannot fold 'mem' away. | |
1976 // For example, 'mem' might be the final state at a conditional return. | |
1977 // Or, 'mem' might be used by some node which is live at the same time | |
1978 // 'this' is live, which might be unschedulable. So, require exactly | |
1979 // ONE user, the 'this' store, until such time as we clone 'mem' for | |
1980 // each of 'mem's uses (thus making the exactly-1-user-rule hold true). | |
1981 if (can_reshape) { // (%%% is this an anachronism?) | |
1982 set_req_X(MemNode::Memory, mem->in(MemNode::Memory), | |
1983 phase->is_IterGVN()); | |
1984 } else { | |
1985 // It's OK to do this in the parser, since DU info is always accurate, | |
1986 // and the parser always refers to nodes via SafePointNode maps. | |
1987 set_req(MemNode::Memory, mem->in(MemNode::Memory)); | |
1988 } | |
1989 return this; | |
1990 } | |
1991 } | |
1992 | |
1993 // Capture an unaliased, unconditional, simple store into an initializer. | |
1994 // Or, if it is independent of the allocation, hoist it above the allocation. | |
1995 if (ReduceFieldZeroing && /*can_reshape &&*/ | |
1996 mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
1997 InitializeNode* init = mem->in(0)->as_Initialize(); | |
1998 intptr_t offset = init->can_capture_store(this, phase); | |
1999 if (offset > 0) { | |
2000 Node* moved = init->capture_store(this, offset, phase); | |
2001 // If the InitializeNode captured me, it made a raw copy of me, | |
2002 // and I need to disappear. | |
2003 if (moved != NULL) { | |
2004 // %%% hack to ensure that Ideal returns a new node: | |
2005 mem = MergeMemNode::make(phase->C, mem); | |
2006 return mem; // fold me away | |
2007 } | |
2008 } | |
2009 } | |
2010 | |
2011 return NULL; // No further progress | |
2012 } | |
2013 | |
2014 //------------------------------Value----------------------------------------- | |
2015 const Type *StoreNode::Value( PhaseTransform *phase ) const { | |
2016 // Either input is TOP ==> the result is TOP | |
2017 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2018 if( t1 == Type::TOP ) return Type::TOP; | |
2019 const Type *t2 = phase->type( in(MemNode::Address) ); | |
2020 if( t2 == Type::TOP ) return Type::TOP; | |
2021 const Type *t3 = phase->type( in(MemNode::ValueIn) ); | |
2022 if( t3 == Type::TOP ) return Type::TOP; | |
2023 return Type::MEMORY; | |
2024 } | |
2025 | |
2026 //------------------------------Identity--------------------------------------- | |
2027 // Remove redundant stores: | |
2028 // Store(m, p, Load(m, p)) changes to m. | |
2029 // Store(, p, x) -> Store(m, p, x) changes to Store(m, p, x). | |
2030 Node *StoreNode::Identity( PhaseTransform *phase ) { | |
2031 Node* mem = in(MemNode::Memory); | |
2032 Node* adr = in(MemNode::Address); | |
2033 Node* val = in(MemNode::ValueIn); | |
2034 | |
2035 // Load then Store? Then the Store is useless | |
2036 if (val->is_Load() && | |
2037 phase->eqv_uncast( val->in(MemNode::Address), adr ) && | |
2038 phase->eqv_uncast( val->in(MemNode::Memory ), mem ) && | |
2039 val->as_Load()->store_Opcode() == Opcode()) { | |
2040 return mem; | |
2041 } | |
2042 | |
2043 // Two stores in a row of the same value? | |
2044 if (mem->is_Store() && | |
2045 phase->eqv_uncast( mem->in(MemNode::Address), adr ) && | |
2046 phase->eqv_uncast( mem->in(MemNode::ValueIn), val ) && | |
2047 mem->Opcode() == Opcode()) { | |
2048 return mem; | |
2049 } | |
2050 | |
2051 // Store of zero anywhere into a freshly-allocated object? | |
2052 // Then the store is useless. | |
2053 // (It must already have been captured by the InitializeNode.) | |
2054 if (ReduceFieldZeroing && phase->type(val)->is_zero_type()) { | |
2055 // a newly allocated object is already all-zeroes everywhere | |
2056 if (mem->is_Proj() && mem->in(0)->is_Allocate()) { | |
2057 return mem; | |
2058 } | |
2059 | |
2060 // the store may also apply to zero-bits in an earlier object | |
2061 Node* prev_mem = find_previous_store(phase); | |
2062 // Steps (a), (b): Walk past independent stores to find an exact match. | |
2063 if (prev_mem != NULL) { | |
2064 Node* prev_val = can_see_stored_value(prev_mem, phase); | |
2065 if (prev_val != NULL && phase->eqv(prev_val, val)) { | |
2066 // prev_val and val might differ by a cast; it would be good | |
2067 // to keep the more informative of the two. | |
2068 return mem; | |
2069 } | |
2070 } | |
2071 } | |
2072 | |
2073 return this; | |
2074 } | |
2075 | |
2076 //------------------------------match_edge------------------------------------- | |
2077 // Do we Match on this edge index or not? Match only memory & value | |
2078 uint StoreNode::match_edge(uint idx) const { | |
2079 return idx == MemNode::Address || idx == MemNode::ValueIn; | |
2080 } | |
2081 | |
2082 //------------------------------cmp-------------------------------------------- | |
2083 // Do not common stores up together. They generally have to be split | |
2084 // back up anyways, so do not bother. | |
2085 uint StoreNode::cmp( const Node &n ) const { | |
2086 return (&n == this); // Always fail except on self | |
2087 } | |
2088 | |
2089 //------------------------------Ideal_masked_input----------------------------- | |
2090 // Check for a useless mask before a partial-word store | |
2091 // (StoreB ... (AndI valIn conIa) ) | |
2092 // If (conIa & mask == mask) this simplifies to | |
2093 // (StoreB ... (valIn) ) | |
2094 Node *StoreNode::Ideal_masked_input(PhaseGVN *phase, uint mask) { | |
2095 Node *val = in(MemNode::ValueIn); | |
2096 if( val->Opcode() == Op_AndI ) { | |
2097 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2098 if( t && t->is_con() && (t->get_con() & mask) == mask ) { | |
2099 set_req(MemNode::ValueIn, val->in(1)); | |
2100 return this; | |
2101 } | |
2102 } | |
2103 return NULL; | |
2104 } | |
2105 | |
2106 | |
2107 //------------------------------Ideal_sign_extended_input---------------------- | |
2108 // Check for useless sign-extension before a partial-word store | |
2109 // (StoreB ... (RShiftI _ (LShiftI _ valIn conIL ) conIR) ) | |
2110 // If (conIL == conIR && conIR <= num_bits) this simplifies to | |
2111 // (StoreB ... (valIn) ) | |
2112 Node *StoreNode::Ideal_sign_extended_input(PhaseGVN *phase, int num_bits) { | |
2113 Node *val = in(MemNode::ValueIn); | |
2114 if( val->Opcode() == Op_RShiftI ) { | |
2115 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2116 if( t && t->is_con() && (t->get_con() <= num_bits) ) { | |
2117 Node *shl = val->in(1); | |
2118 if( shl->Opcode() == Op_LShiftI ) { | |
2119 const TypeInt *t2 = phase->type( shl->in(2) )->isa_int(); | |
2120 if( t2 && t2->is_con() && (t2->get_con() == t->get_con()) ) { | |
2121 set_req(MemNode::ValueIn, shl->in(1)); | |
2122 return this; | |
2123 } | |
2124 } | |
2125 } | |
2126 } | |
2127 return NULL; | |
2128 } | |
2129 | |
2130 //------------------------------value_never_loaded----------------------------------- | |
2131 // Determine whether there are any possible loads of the value stored. | |
2132 // For simplicity, we actually check if there are any loads from the | |
2133 // address stored to, not just for loads of the value stored by this node. | |
2134 // | |
2135 bool StoreNode::value_never_loaded( PhaseTransform *phase) const { | |
2136 Node *adr = in(Address); | |
2137 const TypeOopPtr *adr_oop = phase->type(adr)->isa_oopptr(); | |
2138 if (adr_oop == NULL) | |
2139 return false; | |
223 | 2140 if (!adr_oop->is_known_instance_field()) |
0 | 2141 return false; // if not a distinct instance, there may be aliases of the address |
2142 for (DUIterator_Fast imax, i = adr->fast_outs(imax); i < imax; i++) { | |
2143 Node *use = adr->fast_out(i); | |
2144 int opc = use->Opcode(); | |
2145 if (use->is_Load() || use->is_LoadStore()) { | |
2146 return false; | |
2147 } | |
2148 } | |
2149 return true; | |
2150 } | |
2151 | |
2152 //============================================================================= | |
2153 //------------------------------Ideal------------------------------------------ | |
2154 // If the store is from an AND mask that leaves the low bits untouched, then | |
2155 // we can skip the AND operation. If the store is from a sign-extension | |
2156 // (a left shift, then right shift) we can skip both. | |
2157 Node *StoreBNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2158 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFF); | |
2159 if( progress != NULL ) return progress; | |
2160 | |
2161 progress = StoreNode::Ideal_sign_extended_input(phase, 24); | |
2162 if( progress != NULL ) return progress; | |
2163 | |
2164 // Finally check the default case | |
2165 return StoreNode::Ideal(phase, can_reshape); | |
2166 } | |
2167 | |
2168 //============================================================================= | |
2169 //------------------------------Ideal------------------------------------------ | |
2170 // If the store is from an AND mask that leaves the low bits untouched, then | |
2171 // we can skip the AND operation | |
2172 Node *StoreCNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2173 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFFFF); | |
2174 if( progress != NULL ) return progress; | |
2175 | |
2176 progress = StoreNode::Ideal_sign_extended_input(phase, 16); | |
2177 if( progress != NULL ) return progress; | |
2178 | |
2179 // Finally check the default case | |
2180 return StoreNode::Ideal(phase, can_reshape); | |
2181 } | |
2182 | |
2183 //============================================================================= | |
2184 //------------------------------Identity--------------------------------------- | |
2185 Node *StoreCMNode::Identity( PhaseTransform *phase ) { | |
2186 // No need to card mark when storing a null ptr | |
2187 Node* my_store = in(MemNode::OopStore); | |
2188 if (my_store->is_Store()) { | |
2189 const Type *t1 = phase->type( my_store->in(MemNode::ValueIn) ); | |
2190 if( t1 == TypePtr::NULL_PTR ) { | |
2191 return in(MemNode::Memory); | |
2192 } | |
2193 } | |
2194 return this; | |
2195 } | |
2196 | |
2197 //------------------------------Value----------------------------------------- | |
2198 const Type *StoreCMNode::Value( PhaseTransform *phase ) const { | |
43 | 2199 // Either input is TOP ==> the result is TOP |
2200 const Type *t = phase->type( in(MemNode::Memory) ); | |
2201 if( t == Type::TOP ) return Type::TOP; | |
2202 t = phase->type( in(MemNode::Address) ); | |
2203 if( t == Type::TOP ) return Type::TOP; | |
2204 t = phase->type( in(MemNode::ValueIn) ); | |
2205 if( t == Type::TOP ) return Type::TOP; | |
0 | 2206 // If extra input is TOP ==> the result is TOP |
43 | 2207 t = phase->type( in(MemNode::OopStore) ); |
2208 if( t == Type::TOP ) return Type::TOP; | |
0 | 2209 |
2210 return StoreNode::Value( phase ); | |
2211 } | |
2212 | |
2213 | |
2214 //============================================================================= | |
2215 //----------------------------------SCMemProjNode------------------------------ | |
2216 const Type * SCMemProjNode::Value( PhaseTransform *phase ) const | |
2217 { | |
2218 return bottom_type(); | |
2219 } | |
2220 | |
2221 //============================================================================= | |
2222 LoadStoreNode::LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex ) : Node(5) { | |
2223 init_req(MemNode::Control, c ); | |
2224 init_req(MemNode::Memory , mem); | |
2225 init_req(MemNode::Address, adr); | |
2226 init_req(MemNode::ValueIn, val); | |
2227 init_req( ExpectedIn, ex ); | |
2228 init_class_id(Class_LoadStore); | |
2229 | |
2230 } | |
2231 | |
2232 //============================================================================= | |
2233 //-------------------------------adr_type-------------------------------------- | |
2234 // Do we Match on this edge index or not? Do not match memory | |
2235 const TypePtr* ClearArrayNode::adr_type() const { | |
2236 Node *adr = in(3); | |
2237 return MemNode::calculate_adr_type(adr->bottom_type()); | |
2238 } | |
2239 | |
2240 //------------------------------match_edge------------------------------------- | |
2241 // Do we Match on this edge index or not? Do not match memory | |
2242 uint ClearArrayNode::match_edge(uint idx) const { | |
2243 return idx > 1; | |
2244 } | |
2245 | |
2246 //------------------------------Identity--------------------------------------- | |
2247 // Clearing a zero length array does nothing | |
2248 Node *ClearArrayNode::Identity( PhaseTransform *phase ) { | |
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2249 return phase->type(in(2))->higher_equal(TypeX::ZERO) ? in(1) : this; |
0 | 2250 } |
2251 | |
2252 //------------------------------Idealize--------------------------------------- | |
2253 // Clearing a short array is faster with stores | |
2254 Node *ClearArrayNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2255 const int unit = BytesPerLong; | |
2256 const TypeX* t = phase->type(in(2))->isa_intptr_t(); | |
2257 if (!t) return NULL; | |
2258 if (!t->is_con()) return NULL; | |
2259 intptr_t raw_count = t->get_con(); | |
2260 intptr_t size = raw_count; | |
2261 if (!Matcher::init_array_count_is_in_bytes) size *= unit; | |
2262 // Clearing nothing uses the Identity call. | |
2263 // Negative clears are possible on dead ClearArrays | |
2264 // (see jck test stmt114.stmt11402.val). | |
2265 if (size <= 0 || size % unit != 0) return NULL; | |
2266 intptr_t count = size / unit; | |
2267 // Length too long; use fast hardware clear | |
2268 if (size > Matcher::init_array_short_size) return NULL; | |
2269 Node *mem = in(1); | |
2270 if( phase->type(mem)==Type::TOP ) return NULL; | |
2271 Node *adr = in(3); | |
2272 const Type* at = phase->type(adr); | |
2273 if( at==Type::TOP ) return NULL; | |
2274 const TypePtr* atp = at->isa_ptr(); | |
2275 // adjust atp to be the correct array element address type | |
2276 if (atp == NULL) atp = TypePtr::BOTTOM; | |
2277 else atp = atp->add_offset(Type::OffsetBot); | |
2278 // Get base for derived pointer purposes | |
2279 if( adr->Opcode() != Op_AddP ) Unimplemented(); | |
2280 Node *base = adr->in(1); | |
2281 | |
2282 Node *zero = phase->makecon(TypeLong::ZERO); | |
2283 Node *off = phase->MakeConX(BytesPerLong); | |
2284 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
2285 count--; | |
2286 while( count-- ) { | |
2287 mem = phase->transform(mem); | |
2288 adr = phase->transform(new (phase->C, 4) AddPNode(base,adr,off)); | |
2289 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
2290 } | |
2291 return mem; | |
2292 } | |
2293 | |
2294 //----------------------------clear_memory------------------------------------- | |
2295 // Generate code to initialize object storage to zero. | |
2296 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2297 intptr_t start_offset, | |
2298 Node* end_offset, | |
2299 PhaseGVN* phase) { | |
2300 Compile* C = phase->C; | |
2301 intptr_t offset = start_offset; | |
2302 | |
2303 int unit = BytesPerLong; | |
2304 if ((offset % unit) != 0) { | |
2305 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(offset)); | |
2306 adr = phase->transform(adr); | |
2307 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2308 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
0 | 2309 mem = phase->transform(mem); |
2310 offset += BytesPerInt; | |
2311 } | |
2312 assert((offset % unit) == 0, ""); | |
2313 | |
2314 // Initialize the remaining stuff, if any, with a ClearArray. | |
2315 return clear_memory(ctl, mem, dest, phase->MakeConX(offset), end_offset, phase); | |
2316 } | |
2317 | |
2318 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2319 Node* start_offset, | |
2320 Node* end_offset, | |
2321 PhaseGVN* phase) { | |
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2322 if (start_offset == end_offset) { |
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2323 // nothing to do |
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2324 return mem; |
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2325 } |
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2326 |
0 | 2327 Compile* C = phase->C; |
2328 int unit = BytesPerLong; | |
2329 Node* zbase = start_offset; | |
2330 Node* zend = end_offset; | |
2331 | |
2332 // Scale to the unit required by the CPU: | |
2333 if (!Matcher::init_array_count_is_in_bytes) { | |
2334 Node* shift = phase->intcon(exact_log2(unit)); | |
2335 zbase = phase->transform( new(C,3) URShiftXNode(zbase, shift) ); | |
2336 zend = phase->transform( new(C,3) URShiftXNode(zend, shift) ); | |
2337 } | |
2338 | |
2339 Node* zsize = phase->transform( new(C,3) SubXNode(zend, zbase) ); | |
2340 Node* zinit = phase->zerocon((unit == BytesPerLong) ? T_LONG : T_INT); | |
2341 | |
2342 // Bulk clear double-words | |
2343 Node* adr = phase->transform( new(C,4) AddPNode(dest, dest, start_offset) ); | |
2344 mem = new (C, 4) ClearArrayNode(ctl, mem, zsize, adr); | |
2345 return phase->transform(mem); | |
2346 } | |
2347 | |
2348 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2349 intptr_t start_offset, | |
2350 intptr_t end_offset, | |
2351 PhaseGVN* phase) { | |
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2352 if (start_offset == end_offset) { |
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2353 // nothing to do |
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2354 return mem; |
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2355 } |
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2356 |
0 | 2357 Compile* C = phase->C; |
2358 assert((end_offset % BytesPerInt) == 0, "odd end offset"); | |
2359 intptr_t done_offset = end_offset; | |
2360 if ((done_offset % BytesPerLong) != 0) { | |
2361 done_offset -= BytesPerInt; | |
2362 } | |
2363 if (done_offset > start_offset) { | |
2364 mem = clear_memory(ctl, mem, dest, | |
2365 start_offset, phase->MakeConX(done_offset), phase); | |
2366 } | |
2367 if (done_offset < end_offset) { // emit the final 32-bit store | |
2368 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(done_offset)); | |
2369 adr = phase->transform(adr); | |
2370 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2371 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
0 | 2372 mem = phase->transform(mem); |
2373 done_offset += BytesPerInt; | |
2374 } | |
2375 assert(done_offset == end_offset, ""); | |
2376 return mem; | |
2377 } | |
2378 | |
2379 //============================================================================= | |
2380 // Do we match on this edge? No memory edges | |
2381 uint StrCompNode::match_edge(uint idx) const { | |
2382 return idx == 5 || idx == 6; | |
2383 } | |
2384 | |
2385 //------------------------------Ideal------------------------------------------ | |
2386 // Return a node which is more "ideal" than the current node. Strip out | |
2387 // control copies | |
2388 Node *StrCompNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2389 return remove_dead_region(phase, can_reshape) ? this : NULL; | |
2390 } | |
2391 | |
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2392 //------------------------------Ideal------------------------------------------ |
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2393 // Return a node which is more "ideal" than the current node. Strip out |
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2394 // control copies |
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2395 Node *AryEqNode::Ideal(PhaseGVN *phase, bool can_reshape){ |
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2396 return remove_dead_region(phase, can_reshape) ? this : NULL; |
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2397 } |
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2398 |
0 | 2399 |
2400 //============================================================================= | |
2401 MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent) | |
2402 : MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)), | |
2403 _adr_type(C->get_adr_type(alias_idx)) | |
2404 { | |
2405 init_class_id(Class_MemBar); | |
2406 Node* top = C->top(); | |
2407 init_req(TypeFunc::I_O,top); | |
2408 init_req(TypeFunc::FramePtr,top); | |
2409 init_req(TypeFunc::ReturnAdr,top); | |
2410 if (precedent != NULL) | |
2411 init_req(TypeFunc::Parms, precedent); | |
2412 } | |
2413 | |
2414 //------------------------------cmp-------------------------------------------- | |
2415 uint MemBarNode::hash() const { return NO_HASH; } | |
2416 uint MemBarNode::cmp( const Node &n ) const { | |
2417 return (&n == this); // Always fail except on self | |
2418 } | |
2419 | |
2420 //------------------------------make------------------------------------------- | |
2421 MemBarNode* MemBarNode::make(Compile* C, int opcode, int atp, Node* pn) { | |
2422 int len = Precedent + (pn == NULL? 0: 1); | |
2423 switch (opcode) { | |
2424 case Op_MemBarAcquire: return new(C, len) MemBarAcquireNode(C, atp, pn); | |
2425 case Op_MemBarRelease: return new(C, len) MemBarReleaseNode(C, atp, pn); | |
2426 case Op_MemBarVolatile: return new(C, len) MemBarVolatileNode(C, atp, pn); | |
2427 case Op_MemBarCPUOrder: return new(C, len) MemBarCPUOrderNode(C, atp, pn); | |
2428 case Op_Initialize: return new(C, len) InitializeNode(C, atp, pn); | |
2429 default: ShouldNotReachHere(); return NULL; | |
2430 } | |
2431 } | |
2432 | |
2433 //------------------------------Ideal------------------------------------------ | |
2434 // Return a node which is more "ideal" than the current node. Strip out | |
2435 // control copies | |
2436 Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
2437 if (remove_dead_region(phase, can_reshape)) return this; | |
2438 return NULL; | |
2439 } | |
2440 | |
2441 //------------------------------Value------------------------------------------ | |
2442 const Type *MemBarNode::Value( PhaseTransform *phase ) const { | |
2443 if( !in(0) ) return Type::TOP; | |
2444 if( phase->type(in(0)) == Type::TOP ) | |
2445 return Type::TOP; | |
2446 return TypeTuple::MEMBAR; | |
2447 } | |
2448 | |
2449 //------------------------------match------------------------------------------ | |
2450 // Construct projections for memory. | |
2451 Node *MemBarNode::match( const ProjNode *proj, const Matcher *m ) { | |
2452 switch (proj->_con) { | |
2453 case TypeFunc::Control: | |
2454 case TypeFunc::Memory: | |
2455 return new (m->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); | |
2456 } | |
2457 ShouldNotReachHere(); | |
2458 return NULL; | |
2459 } | |
2460 | |
2461 //===========================InitializeNode==================================== | |
2462 // SUMMARY: | |
2463 // This node acts as a memory barrier on raw memory, after some raw stores. | |
2464 // The 'cooked' oop value feeds from the Initialize, not the Allocation. | |
2465 // The Initialize can 'capture' suitably constrained stores as raw inits. | |
2466 // It can coalesce related raw stores into larger units (called 'tiles'). | |
2467 // It can avoid zeroing new storage for memory units which have raw inits. | |
2468 // At macro-expansion, it is marked 'complete', and does not optimize further. | |
2469 // | |
2470 // EXAMPLE: | |
2471 // The object 'new short[2]' occupies 16 bytes in a 32-bit machine. | |
2472 // ctl = incoming control; mem* = incoming memory | |
2473 // (Note: A star * on a memory edge denotes I/O and other standard edges.) | |
2474 // First allocate uninitialized memory and fill in the header: | |
2475 // alloc = (Allocate ctl mem* 16 #short[].klass ...) | |
2476 // ctl := alloc.Control; mem* := alloc.Memory* | |
2477 // rawmem = alloc.Memory; rawoop = alloc.RawAddress | |
2478 // Then initialize to zero the non-header parts of the raw memory block: | |
2479 // init = (Initialize alloc.Control alloc.Memory* alloc.RawAddress) | |
2480 // ctl := init.Control; mem.SLICE(#short[*]) := init.Memory | |
2481 // After the initialize node executes, the object is ready for service: | |
2482 // oop := (CheckCastPP init.Control alloc.RawAddress #short[]) | |
2483 // Suppose its body is immediately initialized as {1,2}: | |
2484 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
2485 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
2486 // mem.SLICE(#short[*]) := store2 | |
2487 // | |
2488 // DETAILS: | |
2489 // An InitializeNode collects and isolates object initialization after | |
2490 // an AllocateNode and before the next possible safepoint. As a | |
2491 // memory barrier (MemBarNode), it keeps critical stores from drifting | |
2492 // down past any safepoint or any publication of the allocation. | |
2493 // Before this barrier, a newly-allocated object may have uninitialized bits. | |
2494 // After this barrier, it may be treated as a real oop, and GC is allowed. | |
2495 // | |
2496 // The semantics of the InitializeNode include an implicit zeroing of | |
2497 // the new object from object header to the end of the object. | |
2498 // (The object header and end are determined by the AllocateNode.) | |
2499 // | |
2500 // Certain stores may be added as direct inputs to the InitializeNode. | |
2501 // These stores must update raw memory, and they must be to addresses | |
2502 // derived from the raw address produced by AllocateNode, and with | |
2503 // a constant offset. They must be ordered by increasing offset. | |
2504 // The first one is at in(RawStores), the last at in(req()-1). | |
2505 // Unlike most memory operations, they are not linked in a chain, | |
2506 // but are displayed in parallel as users of the rawmem output of | |
2507 // the allocation. | |
2508 // | |
2509 // (See comments in InitializeNode::capture_store, which continue | |
2510 // the example given above.) | |
2511 // | |
2512 // When the associated Allocate is macro-expanded, the InitializeNode | |
2513 // may be rewritten to optimize collected stores. A ClearArrayNode | |
2514 // may also be created at that point to represent any required zeroing. | |
2515 // The InitializeNode is then marked 'complete', prohibiting further | |
2516 // capturing of nearby memory operations. | |
2517 // | |
2518 // During macro-expansion, all captured initializations which store | |
2519 // constant values of 32 bits or smaller are coalesced (if advantagous) | |
2520 // into larger 'tiles' 32 or 64 bits. This allows an object to be | |
2521 // initialized in fewer memory operations. Memory words which are | |
2522 // covered by neither tiles nor non-constant stores are pre-zeroed | |
2523 // by explicit stores of zero. (The code shape happens to do all | |
2524 // zeroing first, then all other stores, with both sequences occurring | |
2525 // in order of ascending offsets.) | |
2526 // | |
2527 // Alternatively, code may be inserted between an AllocateNode and its | |
2528 // InitializeNode, to perform arbitrary initialization of the new object. | |
2529 // E.g., the object copying intrinsics insert complex data transfers here. | |
2530 // The initialization must then be marked as 'complete' disable the | |
2531 // built-in zeroing semantics and the collection of initializing stores. | |
2532 // | |
2533 // While an InitializeNode is incomplete, reads from the memory state | |
2534 // produced by it are optimizable if they match the control edge and | |
2535 // new oop address associated with the allocation/initialization. | |
2536 // They return a stored value (if the offset matches) or else zero. | |
2537 // A write to the memory state, if it matches control and address, | |
2538 // and if it is to a constant offset, may be 'captured' by the | |
2539 // InitializeNode. It is cloned as a raw memory operation and rewired | |
2540 // inside the initialization, to the raw oop produced by the allocation. | |
2541 // Operations on addresses which are provably distinct (e.g., to | |
2542 // other AllocateNodes) are allowed to bypass the initialization. | |
2543 // | |
2544 // The effect of all this is to consolidate object initialization | |
2545 // (both arrays and non-arrays, both piecewise and bulk) into a | |
2546 // single location, where it can be optimized as a unit. | |
2547 // | |
2548 // Only stores with an offset less than TrackedInitializationLimit words | |
2549 // will be considered for capture by an InitializeNode. This puts a | |
2550 // reasonable limit on the complexity of optimized initializations. | |
2551 | |
2552 //---------------------------InitializeNode------------------------------------ | |
2553 InitializeNode::InitializeNode(Compile* C, int adr_type, Node* rawoop) | |
2554 : _is_complete(false), | |
2555 MemBarNode(C, adr_type, rawoop) | |
2556 { | |
2557 init_class_id(Class_Initialize); | |
2558 | |
2559 assert(adr_type == Compile::AliasIdxRaw, "only valid atp"); | |
2560 assert(in(RawAddress) == rawoop, "proper init"); | |
2561 // Note: allocation() can be NULL, for secondary initialization barriers | |
2562 } | |
2563 | |
2564 // Since this node is not matched, it will be processed by the | |
2565 // register allocator. Declare that there are no constraints | |
2566 // on the allocation of the RawAddress edge. | |
2567 const RegMask &InitializeNode::in_RegMask(uint idx) const { | |
2568 // This edge should be set to top, by the set_complete. But be conservative. | |
2569 if (idx == InitializeNode::RawAddress) | |
2570 return *(Compile::current()->matcher()->idealreg2spillmask[in(idx)->ideal_reg()]); | |
2571 return RegMask::Empty; | |
2572 } | |
2573 | |
2574 Node* InitializeNode::memory(uint alias_idx) { | |
2575 Node* mem = in(Memory); | |
2576 if (mem->is_MergeMem()) { | |
2577 return mem->as_MergeMem()->memory_at(alias_idx); | |
2578 } else { | |
2579 // incoming raw memory is not split | |
2580 return mem; | |
2581 } | |
2582 } | |
2583 | |
2584 bool InitializeNode::is_non_zero() { | |
2585 if (is_complete()) return false; | |
2586 remove_extra_zeroes(); | |
2587 return (req() > RawStores); | |
2588 } | |
2589 | |
2590 void InitializeNode::set_complete(PhaseGVN* phase) { | |
2591 assert(!is_complete(), "caller responsibility"); | |
2592 _is_complete = true; | |
2593 | |
2594 // After this node is complete, it contains a bunch of | |
2595 // raw-memory initializations. There is no need for | |
2596 // it to have anything to do with non-raw memory effects. | |
2597 // Therefore, tell all non-raw users to re-optimize themselves, | |
2598 // after skipping the memory effects of this initialization. | |
2599 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
2600 if (igvn) igvn->add_users_to_worklist(this); | |
2601 } | |
2602 | |
2603 // convenience function | |
2604 // return false if the init contains any stores already | |
2605 bool AllocateNode::maybe_set_complete(PhaseGVN* phase) { | |
2606 InitializeNode* init = initialization(); | |
2607 if (init == NULL || init->is_complete()) return false; | |
2608 init->remove_extra_zeroes(); | |
2609 // for now, if this allocation has already collected any inits, bail: | |
2610 if (init->is_non_zero()) return false; | |
2611 init->set_complete(phase); | |
2612 return true; | |
2613 } | |
2614 | |
2615 void InitializeNode::remove_extra_zeroes() { | |
2616 if (req() == RawStores) return; | |
2617 Node* zmem = zero_memory(); | |
2618 uint fill = RawStores; | |
2619 for (uint i = fill; i < req(); i++) { | |
2620 Node* n = in(i); | |
2621 if (n->is_top() || n == zmem) continue; // skip | |
2622 if (fill < i) set_req(fill, n); // compact | |
2623 ++fill; | |
2624 } | |
2625 // delete any empty spaces created: | |
2626 while (fill < req()) { | |
2627 del_req(fill); | |
2628 } | |
2629 } | |
2630 | |
2631 // Helper for remembering which stores go with which offsets. | |
2632 intptr_t InitializeNode::get_store_offset(Node* st, PhaseTransform* phase) { | |
2633 if (!st->is_Store()) return -1; // can happen to dead code via subsume_node | |
2634 intptr_t offset = -1; | |
2635 Node* base = AddPNode::Ideal_base_and_offset(st->in(MemNode::Address), | |
2636 phase, offset); | |
2637 if (base == NULL) return -1; // something is dead, | |
2638 if (offset < 0) return -1; // dead, dead | |
2639 return offset; | |
2640 } | |
2641 | |
2642 // Helper for proving that an initialization expression is | |
2643 // "simple enough" to be folded into an object initialization. | |
2644 // Attempts to prove that a store's initial value 'n' can be captured | |
2645 // within the initialization without creating a vicious cycle, such as: | |
2646 // { Foo p = new Foo(); p.next = p; } | |
2647 // True for constants and parameters and small combinations thereof. | |
2648 bool InitializeNode::detect_init_independence(Node* n, | |
2649 bool st_is_pinned, | |
2650 int& count) { | |
2651 if (n == NULL) return true; // (can this really happen?) | |
2652 if (n->is_Proj()) n = n->in(0); | |
2653 if (n == this) return false; // found a cycle | |
2654 if (n->is_Con()) return true; | |
2655 if (n->is_Start()) return true; // params, etc., are OK | |
2656 if (n->is_Root()) return true; // even better | |
2657 | |
2658 Node* ctl = n->in(0); | |
2659 if (ctl != NULL && !ctl->is_top()) { | |
2660 if (ctl->is_Proj()) ctl = ctl->in(0); | |
2661 if (ctl == this) return false; | |
2662 | |
2663 // If we already know that the enclosing memory op is pinned right after | |
2664 // the init, then any control flow that the store has picked up | |
2665 // must have preceded the init, or else be equal to the init. | |
2666 // Even after loop optimizations (which might change control edges) | |
2667 // a store is never pinned *before* the availability of its inputs. | |
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2668 if (!MemNode::all_controls_dominate(n, this)) |
0 | 2669 return false; // failed to prove a good control |
2670 | |
2671 } | |
2672 | |
2673 // Check data edges for possible dependencies on 'this'. | |
2674 if ((count += 1) > 20) return false; // complexity limit | |
2675 for (uint i = 1; i < n->req(); i++) { | |
2676 Node* m = n->in(i); | |
2677 if (m == NULL || m == n || m->is_top()) continue; | |
2678 uint first_i = n->find_edge(m); | |
2679 if (i != first_i) continue; // process duplicate edge just once | |
2680 if (!detect_init_independence(m, st_is_pinned, count)) { | |
2681 return false; | |
2682 } | |
2683 } | |
2684 | |
2685 return true; | |
2686 } | |
2687 | |
2688 // Here are all the checks a Store must pass before it can be moved into | |
2689 // an initialization. Returns zero if a check fails. | |
2690 // On success, returns the (constant) offset to which the store applies, | |
2691 // within the initialized memory. | |
2692 intptr_t InitializeNode::can_capture_store(StoreNode* st, PhaseTransform* phase) { | |
2693 const int FAIL = 0; | |
2694 if (st->req() != MemNode::ValueIn + 1) | |
2695 return FAIL; // an inscrutable StoreNode (card mark?) | |
2696 Node* ctl = st->in(MemNode::Control); | |
2697 if (!(ctl != NULL && ctl->is_Proj() && ctl->in(0) == this)) | |
2698 return FAIL; // must be unconditional after the initialization | |
2699 Node* mem = st->in(MemNode::Memory); | |
2700 if (!(mem->is_Proj() && mem->in(0) == this)) | |
2701 return FAIL; // must not be preceded by other stores | |
2702 Node* adr = st->in(MemNode::Address); | |
2703 intptr_t offset; | |
2704 AllocateNode* alloc = AllocateNode::Ideal_allocation(adr, phase, offset); | |
2705 if (alloc == NULL) | |
2706 return FAIL; // inscrutable address | |
2707 if (alloc != allocation()) | |
2708 return FAIL; // wrong allocation! (store needs to float up) | |
2709 Node* val = st->in(MemNode::ValueIn); | |
2710 int complexity_count = 0; | |
2711 if (!detect_init_independence(val, true, complexity_count)) | |
2712 return FAIL; // stored value must be 'simple enough' | |
2713 | |
2714 return offset; // success | |
2715 } | |
2716 | |
2717 // Find the captured store in(i) which corresponds to the range | |
2718 // [start..start+size) in the initialized object. | |
2719 // If there is one, return its index i. If there isn't, return the | |
2720 // negative of the index where it should be inserted. | |
2721 // Return 0 if the queried range overlaps an initialization boundary | |
2722 // or if dead code is encountered. | |
2723 // If size_in_bytes is zero, do not bother with overlap checks. | |
2724 int InitializeNode::captured_store_insertion_point(intptr_t start, | |
2725 int size_in_bytes, | |
2726 PhaseTransform* phase) { | |
2727 const int FAIL = 0, MAX_STORE = BytesPerLong; | |
2728 | |
2729 if (is_complete()) | |
2730 return FAIL; // arraycopy got here first; punt | |
2731 | |
2732 assert(allocation() != NULL, "must be present"); | |
2733 | |
2734 // no negatives, no header fields: | |
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2735 if (start < (intptr_t) allocation()->minimum_header_size()) return FAIL; |
0 | 2736 |
2737 // after a certain size, we bail out on tracking all the stores: | |
2738 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
2739 if (start >= ti_limit) return FAIL; | |
2740 | |
2741 for (uint i = InitializeNode::RawStores, limit = req(); ; ) { | |
2742 if (i >= limit) return -(int)i; // not found; here is where to put it | |
2743 | |
2744 Node* st = in(i); | |
2745 intptr_t st_off = get_store_offset(st, phase); | |
2746 if (st_off < 0) { | |
2747 if (st != zero_memory()) { | |
2748 return FAIL; // bail out if there is dead garbage | |
2749 } | |
2750 } else if (st_off > start) { | |
2751 // ...we are done, since stores are ordered | |
2752 if (st_off < start + size_in_bytes) { | |
2753 return FAIL; // the next store overlaps | |
2754 } | |
2755 return -(int)i; // not found; here is where to put it | |
2756 } else if (st_off < start) { | |
2757 if (size_in_bytes != 0 && | |
2758 start < st_off + MAX_STORE && | |
2759 start < st_off + st->as_Store()->memory_size()) { | |
2760 return FAIL; // the previous store overlaps | |
2761 } | |
2762 } else { | |
2763 if (size_in_bytes != 0 && | |
2764 st->as_Store()->memory_size() != size_in_bytes) { | |
2765 return FAIL; // mismatched store size | |
2766 } | |
2767 return i; | |
2768 } | |
2769 | |
2770 ++i; | |
2771 } | |
2772 } | |
2773 | |
2774 // Look for a captured store which initializes at the offset 'start' | |
2775 // with the given size. If there is no such store, and no other | |
2776 // initialization interferes, then return zero_memory (the memory | |
2777 // projection of the AllocateNode). | |
2778 Node* InitializeNode::find_captured_store(intptr_t start, int size_in_bytes, | |
2779 PhaseTransform* phase) { | |
2780 assert(stores_are_sane(phase), ""); | |
2781 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
2782 if (i == 0) { | |
2783 return NULL; // something is dead | |
2784 } else if (i < 0) { | |
2785 return zero_memory(); // just primordial zero bits here | |
2786 } else { | |
2787 Node* st = in(i); // here is the store at this position | |
2788 assert(get_store_offset(st->as_Store(), phase) == start, "sanity"); | |
2789 return st; | |
2790 } | |
2791 } | |
2792 | |
2793 // Create, as a raw pointer, an address within my new object at 'offset'. | |
2794 Node* InitializeNode::make_raw_address(intptr_t offset, | |
2795 PhaseTransform* phase) { | |
2796 Node* addr = in(RawAddress); | |
2797 if (offset != 0) { | |
2798 Compile* C = phase->C; | |
2799 addr = phase->transform( new (C, 4) AddPNode(C->top(), addr, | |
2800 phase->MakeConX(offset)) ); | |
2801 } | |
2802 return addr; | |
2803 } | |
2804 | |
2805 // Clone the given store, converting it into a raw store | |
2806 // initializing a field or element of my new object. | |
2807 // Caller is responsible for retiring the original store, | |
2808 // with subsume_node or the like. | |
2809 // | |
2810 // From the example above InitializeNode::InitializeNode, | |
2811 // here are the old stores to be captured: | |
2812 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
2813 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
2814 // | |
2815 // Here is the changed code; note the extra edges on init: | |
2816 // alloc = (Allocate ...) | |
2817 // rawoop = alloc.RawAddress | |
2818 // rawstore1 = (StoreC alloc.Control alloc.Memory (+ rawoop 12) 1) | |
2819 // rawstore2 = (StoreC alloc.Control alloc.Memory (+ rawoop 14) 2) | |
2820 // init = (Initialize alloc.Control alloc.Memory rawoop | |
2821 // rawstore1 rawstore2) | |
2822 // | |
2823 Node* InitializeNode::capture_store(StoreNode* st, intptr_t start, | |
2824 PhaseTransform* phase) { | |
2825 assert(stores_are_sane(phase), ""); | |
2826 | |
2827 if (start < 0) return NULL; | |
2828 assert(can_capture_store(st, phase) == start, "sanity"); | |
2829 | |
2830 Compile* C = phase->C; | |
2831 int size_in_bytes = st->memory_size(); | |
2832 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
2833 if (i == 0) return NULL; // bail out | |
2834 Node* prev_mem = NULL; // raw memory for the captured store | |
2835 if (i > 0) { | |
2836 prev_mem = in(i); // there is a pre-existing store under this one | |
2837 set_req(i, C->top()); // temporarily disconnect it | |
2838 // See StoreNode::Ideal 'st->outcnt() == 1' for the reason to disconnect. | |
2839 } else { | |
2840 i = -i; // no pre-existing store | |
2841 prev_mem = zero_memory(); // a slice of the newly allocated object | |
2842 if (i > InitializeNode::RawStores && in(i-1) == prev_mem) | |
2843 set_req(--i, C->top()); // reuse this edge; it has been folded away | |
2844 else | |
2845 ins_req(i, C->top()); // build a new edge | |
2846 } | |
2847 Node* new_st = st->clone(); | |
2848 new_st->set_req(MemNode::Control, in(Control)); | |
2849 new_st->set_req(MemNode::Memory, prev_mem); | |
2850 new_st->set_req(MemNode::Address, make_raw_address(start, phase)); | |
2851 new_st = phase->transform(new_st); | |
2852 | |
2853 // At this point, new_st might have swallowed a pre-existing store | |
2854 // at the same offset, or perhaps new_st might have disappeared, | |
2855 // if it redundantly stored the same value (or zero to fresh memory). | |
2856 | |
2857 // In any case, wire it in: | |
2858 set_req(i, new_st); | |
2859 | |
2860 // The caller may now kill the old guy. | |
2861 DEBUG_ONLY(Node* check_st = find_captured_store(start, size_in_bytes, phase)); | |
2862 assert(check_st == new_st || check_st == NULL, "must be findable"); | |
2863 assert(!is_complete(), ""); | |
2864 return new_st; | |
2865 } | |
2866 | |
2867 static bool store_constant(jlong* tiles, int num_tiles, | |
2868 intptr_t st_off, int st_size, | |
2869 jlong con) { | |
2870 if ((st_off & (st_size-1)) != 0) | |
2871 return false; // strange store offset (assume size==2**N) | |
2872 address addr = (address)tiles + st_off; | |
2873 assert(st_off >= 0 && addr+st_size <= (address)&tiles[num_tiles], "oob"); | |
2874 switch (st_size) { | |
2875 case sizeof(jbyte): *(jbyte*) addr = (jbyte) con; break; | |
2876 case sizeof(jchar): *(jchar*) addr = (jchar) con; break; | |
2877 case sizeof(jint): *(jint*) addr = (jint) con; break; | |
2878 case sizeof(jlong): *(jlong*) addr = (jlong) con; break; | |
2879 default: return false; // strange store size (detect size!=2**N here) | |
2880 } | |
2881 return true; // return success to caller | |
2882 } | |
2883 | |
2884 // Coalesce subword constants into int constants and possibly | |
2885 // into long constants. The goal, if the CPU permits, | |
2886 // is to initialize the object with a small number of 64-bit tiles. | |
2887 // Also, convert floating-point constants to bit patterns. | |
2888 // Non-constants are not relevant to this pass. | |
2889 // | |
2890 // In terms of the running example on InitializeNode::InitializeNode | |
2891 // and InitializeNode::capture_store, here is the transformation | |
2892 // of rawstore1 and rawstore2 into rawstore12: | |
2893 // alloc = (Allocate ...) | |
2894 // rawoop = alloc.RawAddress | |
2895 // tile12 = 0x00010002 | |
2896 // rawstore12 = (StoreI alloc.Control alloc.Memory (+ rawoop 12) tile12) | |
2897 // init = (Initialize alloc.Control alloc.Memory rawoop rawstore12) | |
2898 // | |
2899 void | |
2900 InitializeNode::coalesce_subword_stores(intptr_t header_size, | |
2901 Node* size_in_bytes, | |
2902 PhaseGVN* phase) { | |
2903 Compile* C = phase->C; | |
2904 | |
2905 assert(stores_are_sane(phase), ""); | |
2906 // Note: After this pass, they are not completely sane, | |
2907 // since there may be some overlaps. | |
2908 | |
2909 int old_subword = 0, old_long = 0, new_int = 0, new_long = 0; | |
2910 | |
2911 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
2912 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, ti_limit); | |
2913 size_limit = MIN2(size_limit, ti_limit); | |
2914 size_limit = align_size_up(size_limit, BytesPerLong); | |
2915 int num_tiles = size_limit / BytesPerLong; | |
2916 | |
2917 // allocate space for the tile map: | |
2918 const int small_len = DEBUG_ONLY(true ? 3 :) 30; // keep stack frames small | |
2919 jlong tiles_buf[small_len]; | |
2920 Node* nodes_buf[small_len]; | |
2921 jlong inits_buf[small_len]; | |
2922 jlong* tiles = ((num_tiles <= small_len) ? &tiles_buf[0] | |
2923 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
2924 Node** nodes = ((num_tiles <= small_len) ? &nodes_buf[0] | |
2925 : NEW_RESOURCE_ARRAY(Node*, num_tiles)); | |
2926 jlong* inits = ((num_tiles <= small_len) ? &inits_buf[0] | |
2927 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
2928 // tiles: exact bitwise model of all primitive constants | |
2929 // nodes: last constant-storing node subsumed into the tiles model | |
2930 // inits: which bytes (in each tile) are touched by any initializations | |
2931 | |
2932 //// Pass A: Fill in the tile model with any relevant stores. | |
2933 | |
2934 Copy::zero_to_bytes(tiles, sizeof(tiles[0]) * num_tiles); | |
2935 Copy::zero_to_bytes(nodes, sizeof(nodes[0]) * num_tiles); | |
2936 Copy::zero_to_bytes(inits, sizeof(inits[0]) * num_tiles); | |
2937 Node* zmem = zero_memory(); // initially zero memory state | |
2938 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
2939 Node* st = in(i); | |
2940 intptr_t st_off = get_store_offset(st, phase); | |
2941 | |
2942 // Figure out the store's offset and constant value: | |
2943 if (st_off < header_size) continue; //skip (ignore header) | |
2944 if (st->in(MemNode::Memory) != zmem) continue; //skip (odd store chain) | |
2945 int st_size = st->as_Store()->memory_size(); | |
2946 if (st_off + st_size > size_limit) break; | |
2947 | |
2948 // Record which bytes are touched, whether by constant or not. | |
2949 if (!store_constant(inits, num_tiles, st_off, st_size, (jlong) -1)) | |
2950 continue; // skip (strange store size) | |
2951 | |
2952 const Type* val = phase->type(st->in(MemNode::ValueIn)); | |
2953 if (!val->singleton()) continue; //skip (non-con store) | |
2954 BasicType type = val->basic_type(); | |
2955 | |
2956 jlong con = 0; | |
2957 switch (type) { | |
2958 case T_INT: con = val->is_int()->get_con(); break; | |
2959 case T_LONG: con = val->is_long()->get_con(); break; | |
2960 case T_FLOAT: con = jint_cast(val->getf()); break; | |
2961 case T_DOUBLE: con = jlong_cast(val->getd()); break; | |
2962 default: continue; //skip (odd store type) | |
2963 } | |
2964 | |
2965 if (type == T_LONG && Matcher::isSimpleConstant64(con) && | |
2966 st->Opcode() == Op_StoreL) { | |
2967 continue; // This StoreL is already optimal. | |
2968 } | |
2969 | |
2970 // Store down the constant. | |
2971 store_constant(tiles, num_tiles, st_off, st_size, con); | |
2972 | |
2973 intptr_t j = st_off >> LogBytesPerLong; | |
2974 | |
2975 if (type == T_INT && st_size == BytesPerInt | |
2976 && (st_off & BytesPerInt) == BytesPerInt) { | |
2977 jlong lcon = tiles[j]; | |
2978 if (!Matcher::isSimpleConstant64(lcon) && | |
2979 st->Opcode() == Op_StoreI) { | |
2980 // This StoreI is already optimal by itself. | |
2981 jint* intcon = (jint*) &tiles[j]; | |
2982 intcon[1] = 0; // undo the store_constant() | |
2983 | |
2984 // If the previous store is also optimal by itself, back up and | |
2985 // undo the action of the previous loop iteration... if we can. | |
2986 // But if we can't, just let the previous half take care of itself. | |
2987 st = nodes[j]; | |
2988 st_off -= BytesPerInt; | |
2989 con = intcon[0]; | |
2990 if (con != 0 && st != NULL && st->Opcode() == Op_StoreI) { | |
2991 assert(st_off >= header_size, "still ignoring header"); | |
2992 assert(get_store_offset(st, phase) == st_off, "must be"); | |
2993 assert(in(i-1) == zmem, "must be"); | |
2994 DEBUG_ONLY(const Type* tcon = phase->type(st->in(MemNode::ValueIn))); | |
2995 assert(con == tcon->is_int()->get_con(), "must be"); | |
2996 // Undo the effects of the previous loop trip, which swallowed st: | |
2997 intcon[0] = 0; // undo store_constant() | |
2998 set_req(i-1, st); // undo set_req(i, zmem) | |
2999 nodes[j] = NULL; // undo nodes[j] = st | |
3000 --old_subword; // undo ++old_subword | |
3001 } | |
3002 continue; // This StoreI is already optimal. | |
3003 } | |
3004 } | |
3005 | |
3006 // This store is not needed. | |
3007 set_req(i, zmem); | |
3008 nodes[j] = st; // record for the moment | |
3009 if (st_size < BytesPerLong) // something has changed | |
3010 ++old_subword; // includes int/float, but who's counting... | |
3011 else ++old_long; | |
3012 } | |
3013 | |
3014 if ((old_subword + old_long) == 0) | |
3015 return; // nothing more to do | |
3016 | |
3017 //// Pass B: Convert any non-zero tiles into optimal constant stores. | |
3018 // Be sure to insert them before overlapping non-constant stores. | |
3019 // (E.g., byte[] x = { 1,2,y,4 } => x[int 0] = 0x01020004, x[2]=y.) | |
3020 for (int j = 0; j < num_tiles; j++) { | |
3021 jlong con = tiles[j]; | |
3022 jlong init = inits[j]; | |
3023 if (con == 0) continue; | |
3024 jint con0, con1; // split the constant, address-wise | |
3025 jint init0, init1; // split the init map, address-wise | |
3026 { union { jlong con; jint intcon[2]; } u; | |
3027 u.con = con; | |
3028 con0 = u.intcon[0]; | |
3029 con1 = u.intcon[1]; | |
3030 u.con = init; | |
3031 init0 = u.intcon[0]; | |
3032 init1 = u.intcon[1]; | |
3033 } | |
3034 | |
3035 Node* old = nodes[j]; | |
3036 assert(old != NULL, "need the prior store"); | |
3037 intptr_t offset = (j * BytesPerLong); | |
3038 | |
3039 bool split = !Matcher::isSimpleConstant64(con); | |
3040 | |
3041 if (offset < header_size) { | |
3042 assert(offset + BytesPerInt >= header_size, "second int counts"); | |
3043 assert(*(jint*)&tiles[j] == 0, "junk in header"); | |
3044 split = true; // only the second word counts | |
3045 // Example: int a[] = { 42 ... } | |
3046 } else if (con0 == 0 && init0 == -1) { | |
3047 split = true; // first word is covered by full inits | |
3048 // Example: int a[] = { ... foo(), 42 ... } | |
3049 } else if (con1 == 0 && init1 == -1) { | |
3050 split = true; // second word is covered by full inits | |
3051 // Example: int a[] = { ... 42, foo() ... } | |
3052 } | |
3053 | |
3054 // Here's a case where init0 is neither 0 nor -1: | |
3055 // byte a[] = { ... 0,0,foo(),0, 0,0,0,42 ... } | |
3056 // Assuming big-endian memory, init0, init1 are 0x0000FF00, 0x000000FF. | |
3057 // In this case the tile is not split; it is (jlong)42. | |
3058 // The big tile is stored down, and then the foo() value is inserted. | |
3059 // (If there were foo(),foo() instead of foo(),0, init0 would be -1.) | |
3060 | |
3061 Node* ctl = old->in(MemNode::Control); | |
3062 Node* adr = make_raw_address(offset, phase); | |
3063 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
3064 | |
3065 // One or two coalesced stores to plop down. | |
3066 Node* st[2]; | |
3067 intptr_t off[2]; | |
3068 int nst = 0; | |
3069 if (!split) { | |
3070 ++new_long; | |
3071 off[nst] = offset; | |
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3072 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3073 phase->longcon(con), T_LONG); |
3074 } else { | |
3075 // Omit either if it is a zero. | |
3076 if (con0 != 0) { | |
3077 ++new_int; | |
3078 off[nst] = offset; | |
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3079 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3080 phase->intcon(con0), T_INT); |
3081 } | |
3082 if (con1 != 0) { | |
3083 ++new_int; | |
3084 offset += BytesPerInt; | |
3085 adr = make_raw_address(offset, phase); | |
3086 off[nst] = offset; | |
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3087 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3088 phase->intcon(con1), T_INT); |
3089 } | |
3090 } | |
3091 | |
3092 // Insert second store first, then the first before the second. | |
3093 // Insert each one just before any overlapping non-constant stores. | |
3094 while (nst > 0) { | |
3095 Node* st1 = st[--nst]; | |
3096 C->copy_node_notes_to(st1, old); | |
3097 st1 = phase->transform(st1); | |
3098 offset = off[nst]; | |
3099 assert(offset >= header_size, "do not smash header"); | |
3100 int ins_idx = captured_store_insertion_point(offset, /*size:*/0, phase); | |
3101 guarantee(ins_idx != 0, "must re-insert constant store"); | |
3102 if (ins_idx < 0) ins_idx = -ins_idx; // never overlap | |
3103 if (ins_idx > InitializeNode::RawStores && in(ins_idx-1) == zmem) | |
3104 set_req(--ins_idx, st1); | |
3105 else | |
3106 ins_req(ins_idx, st1); | |
3107 } | |
3108 } | |
3109 | |
3110 if (PrintCompilation && WizardMode) | |
3111 tty->print_cr("Changed %d/%d subword/long constants into %d/%d int/long", | |
3112 old_subword, old_long, new_int, new_long); | |
3113 if (C->log() != NULL) | |
3114 C->log()->elem("comment that='%d/%d subword/long to %d/%d int/long'", | |
3115 old_subword, old_long, new_int, new_long); | |
3116 | |
3117 // Clean up any remaining occurrences of zmem: | |
3118 remove_extra_zeroes(); | |
3119 } | |
3120 | |
3121 // Explore forward from in(start) to find the first fully initialized | |
3122 // word, and return its offset. Skip groups of subword stores which | |
3123 // together initialize full words. If in(start) is itself part of a | |
3124 // fully initialized word, return the offset of in(start). If there | |
3125 // are no following full-word stores, or if something is fishy, return | |
3126 // a negative value. | |
3127 intptr_t InitializeNode::find_next_fullword_store(uint start, PhaseGVN* phase) { | |
3128 int int_map = 0; | |
3129 intptr_t int_map_off = 0; | |
3130 const int FULL_MAP = right_n_bits(BytesPerInt); // the int_map we hope for | |
3131 | |
3132 for (uint i = start, limit = req(); i < limit; i++) { | |
3133 Node* st = in(i); | |
3134 | |
3135 intptr_t st_off = get_store_offset(st, phase); | |
3136 if (st_off < 0) break; // return conservative answer | |
3137 | |
3138 int st_size = st->as_Store()->memory_size(); | |
3139 if (st_size >= BytesPerInt && (st_off % BytesPerInt) == 0) { | |
3140 return st_off; // we found a complete word init | |
3141 } | |
3142 | |
3143 // update the map: | |
3144 | |
3145 intptr_t this_int_off = align_size_down(st_off, BytesPerInt); | |
3146 if (this_int_off != int_map_off) { | |
3147 // reset the map: | |
3148 int_map = 0; | |
3149 int_map_off = this_int_off; | |
3150 } | |
3151 | |
3152 int subword_off = st_off - this_int_off; | |
3153 int_map |= right_n_bits(st_size) << subword_off; | |
3154 if ((int_map & FULL_MAP) == FULL_MAP) { | |
3155 return this_int_off; // we found a complete word init | |
3156 } | |
3157 | |
3158 // Did this store hit or cross the word boundary? | |
3159 intptr_t next_int_off = align_size_down(st_off + st_size, BytesPerInt); | |
3160 if (next_int_off == this_int_off + BytesPerInt) { | |
3161 // We passed the current int, without fully initializing it. | |
3162 int_map_off = next_int_off; | |
3163 int_map >>= BytesPerInt; | |
3164 } else if (next_int_off > this_int_off + BytesPerInt) { | |
3165 // We passed the current and next int. | |
3166 return this_int_off + BytesPerInt; | |
3167 } | |
3168 } | |
3169 | |
3170 return -1; | |
3171 } | |
3172 | |
3173 | |
3174 // Called when the associated AllocateNode is expanded into CFG. | |
3175 // At this point, we may perform additional optimizations. | |
3176 // Linearize the stores by ascending offset, to make memory | |
3177 // activity as coherent as possible. | |
3178 Node* InitializeNode::complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
3179 intptr_t header_size, | |
3180 Node* size_in_bytes, | |
3181 PhaseGVN* phase) { | |
3182 assert(!is_complete(), "not already complete"); | |
3183 assert(stores_are_sane(phase), ""); | |
3184 assert(allocation() != NULL, "must be present"); | |
3185 | |
3186 remove_extra_zeroes(); | |
3187 | |
3188 if (ReduceFieldZeroing || ReduceBulkZeroing) | |
3189 // reduce instruction count for common initialization patterns | |
3190 coalesce_subword_stores(header_size, size_in_bytes, phase); | |
3191 | |
3192 Node* zmem = zero_memory(); // initially zero memory state | |
3193 Node* inits = zmem; // accumulating a linearized chain of inits | |
3194 #ifdef ASSERT | |
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3195 intptr_t first_offset = allocation()->minimum_header_size(); |
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3196 intptr_t last_init_off = first_offset; // previous init offset |
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3197 intptr_t last_init_end = first_offset; // previous init offset+size |
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3198 intptr_t last_tile_end = first_offset; // previous tile offset+size |
0 | 3199 #endif |
3200 intptr_t zeroes_done = header_size; | |
3201 | |
3202 bool do_zeroing = true; // we might give up if inits are very sparse | |
3203 int big_init_gaps = 0; // how many large gaps have we seen? | |
3204 | |
3205 if (ZeroTLAB) do_zeroing = false; | |
3206 if (!ReduceFieldZeroing && !ReduceBulkZeroing) do_zeroing = false; | |
3207 | |
3208 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3209 Node* st = in(i); | |
3210 intptr_t st_off = get_store_offset(st, phase); | |
3211 if (st_off < 0) | |
3212 break; // unknown junk in the inits | |
3213 if (st->in(MemNode::Memory) != zmem) | |
3214 break; // complicated store chains somehow in list | |
3215 | |
3216 int st_size = st->as_Store()->memory_size(); | |
3217 intptr_t next_init_off = st_off + st_size; | |
3218 | |
3219 if (do_zeroing && zeroes_done < next_init_off) { | |
3220 // See if this store needs a zero before it or under it. | |
3221 intptr_t zeroes_needed = st_off; | |
3222 | |
3223 if (st_size < BytesPerInt) { | |
3224 // Look for subword stores which only partially initialize words. | |
3225 // If we find some, we must lay down some word-level zeroes first, | |
3226 // underneath the subword stores. | |
3227 // | |
3228 // Examples: | |
3229 // byte[] a = { p,q,r,s } => a[0]=p,a[1]=q,a[2]=r,a[3]=s | |
3230 // byte[] a = { x,y,0,0 } => a[0..3] = 0, a[0]=x,a[1]=y | |
3231 // byte[] a = { 0,0,z,0 } => a[0..3] = 0, a[2]=z | |
3232 // | |
3233 // Note: coalesce_subword_stores may have already done this, | |
3234 // if it was prompted by constant non-zero subword initializers. | |
3235 // But this case can still arise with non-constant stores. | |
3236 | |
3237 intptr_t next_full_store = find_next_fullword_store(i, phase); | |
3238 | |
3239 // In the examples above: | |
3240 // in(i) p q r s x y z | |
3241 // st_off 12 13 14 15 12 13 14 | |
3242 // st_size 1 1 1 1 1 1 1 | |
3243 // next_full_s. 12 16 16 16 16 16 16 | |
3244 // z's_done 12 16 16 16 12 16 12 | |
3245 // z's_needed 12 16 16 16 16 16 16 | |
3246 // zsize 0 0 0 0 4 0 4 | |
3247 if (next_full_store < 0) { | |
3248 // Conservative tack: Zero to end of current word. | |
3249 zeroes_needed = align_size_up(zeroes_needed, BytesPerInt); | |
3250 } else { | |
3251 // Zero to beginning of next fully initialized word. | |
3252 // Or, don't zero at all, if we are already in that word. | |
3253 assert(next_full_store >= zeroes_needed, "must go forward"); | |
3254 assert((next_full_store & (BytesPerInt-1)) == 0, "even boundary"); | |
3255 zeroes_needed = next_full_store; | |
3256 } | |
3257 } | |
3258 | |
3259 if (zeroes_needed > zeroes_done) { | |
3260 intptr_t zsize = zeroes_needed - zeroes_done; | |
3261 // Do some incremental zeroing on rawmem, in parallel with inits. | |
3262 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3263 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3264 zeroes_done, zeroes_needed, | |
3265 phase); | |
3266 zeroes_done = zeroes_needed; | |
3267 if (zsize > Matcher::init_array_short_size && ++big_init_gaps > 2) | |
3268 do_zeroing = false; // leave the hole, next time | |
3269 } | |
3270 } | |
3271 | |
3272 // Collect the store and move on: | |
3273 st->set_req(MemNode::Memory, inits); | |
3274 inits = st; // put it on the linearized chain | |
3275 set_req(i, zmem); // unhook from previous position | |
3276 | |
3277 if (zeroes_done == st_off) | |
3278 zeroes_done = next_init_off; | |
3279 | |
3280 assert(!do_zeroing || zeroes_done >= next_init_off, "don't miss any"); | |
3281 | |
3282 #ifdef ASSERT | |
3283 // Various order invariants. Weaker than stores_are_sane because | |
3284 // a large constant tile can be filled in by smaller non-constant stores. | |
3285 assert(st_off >= last_init_off, "inits do not reverse"); | |
3286 last_init_off = st_off; | |
3287 const Type* val = NULL; | |
3288 if (st_size >= BytesPerInt && | |
3289 (val = phase->type(st->in(MemNode::ValueIn)))->singleton() && | |
3290 (int)val->basic_type() < (int)T_OBJECT) { | |
3291 assert(st_off >= last_tile_end, "tiles do not overlap"); | |
3292 assert(st_off >= last_init_end, "tiles do not overwrite inits"); | |
3293 last_tile_end = MAX2(last_tile_end, next_init_off); | |
3294 } else { | |
3295 intptr_t st_tile_end = align_size_up(next_init_off, BytesPerLong); | |
3296 assert(st_tile_end >= last_tile_end, "inits stay with tiles"); | |
3297 assert(st_off >= last_init_end, "inits do not overlap"); | |
3298 last_init_end = next_init_off; // it's a non-tile | |
3299 } | |
3300 #endif //ASSERT | |
3301 } | |
3302 | |
3303 remove_extra_zeroes(); // clear out all the zmems left over | |
3304 add_req(inits); | |
3305 | |
3306 if (!ZeroTLAB) { | |
3307 // If anything remains to be zeroed, zero it all now. | |
3308 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3309 // if it is the last unused 4 bytes of an instance, forget about it | |
3310 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint); | |
3311 if (zeroes_done + BytesPerLong >= size_limit) { | |
3312 assert(allocation() != NULL, ""); | |
3313 Node* klass_node = allocation()->in(AllocateNode::KlassNode); | |
3314 ciKlass* k = phase->type(klass_node)->is_klassptr()->klass(); | |
3315 if (zeroes_done == k->layout_helper()) | |
3316 zeroes_done = size_limit; | |
3317 } | |
3318 if (zeroes_done < size_limit) { | |
3319 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3320 zeroes_done, size_in_bytes, phase); | |
3321 } | |
3322 } | |
3323 | |
3324 set_complete(phase); | |
3325 return rawmem; | |
3326 } | |
3327 | |
3328 | |
3329 #ifdef ASSERT | |
3330 bool InitializeNode::stores_are_sane(PhaseTransform* phase) { | |
3331 if (is_complete()) | |
3332 return true; // stores could be anything at this point | |
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3333 assert(allocation() != NULL, "must be present"); |
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3334 intptr_t last_off = allocation()->minimum_header_size(); |
0 | 3335 for (uint i = InitializeNode::RawStores; i < req(); i++) { |
3336 Node* st = in(i); | |
3337 intptr_t st_off = get_store_offset(st, phase); | |
3338 if (st_off < 0) continue; // ignore dead garbage | |
3339 if (last_off > st_off) { | |
3340 tty->print_cr("*** bad store offset at %d: %d > %d", i, last_off, st_off); | |
3341 this->dump(2); | |
3342 assert(false, "ascending store offsets"); | |
3343 return false; | |
3344 } | |
3345 last_off = st_off + st->as_Store()->memory_size(); | |
3346 } | |
3347 return true; | |
3348 } | |
3349 #endif //ASSERT | |
3350 | |
3351 | |
3352 | |
3353 | |
3354 //============================MergeMemNode===================================== | |
3355 // | |
3356 // SEMANTICS OF MEMORY MERGES: A MergeMem is a memory state assembled from several | |
3357 // contributing store or call operations. Each contributor provides the memory | |
3358 // state for a particular "alias type" (see Compile::alias_type). For example, | |
3359 // if a MergeMem has an input X for alias category #6, then any memory reference | |
3360 // to alias category #6 may use X as its memory state input, as an exact equivalent | |
3361 // to using the MergeMem as a whole. | |
3362 // Load<6>( MergeMem(<6>: X, ...), p ) <==> Load<6>(X,p) | |
3363 // | |
3364 // (Here, the <N> notation gives the index of the relevant adr_type.) | |
3365 // | |
3366 // In one special case (and more cases in the future), alias categories overlap. | |
3367 // The special alias category "Bot" (Compile::AliasIdxBot) includes all memory | |
3368 // states. Therefore, if a MergeMem has only one contributing input W for Bot, | |
3369 // it is exactly equivalent to that state W: | |
3370 // MergeMem(<Bot>: W) <==> W | |
3371 // | |
3372 // Usually, the merge has more than one input. In that case, where inputs | |
3373 // overlap (i.e., one is Bot), the narrower alias type determines the memory | |
3374 // state for that type, and the wider alias type (Bot) fills in everywhere else: | |
3375 // Load<5>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<5>(W,p) | |
3376 // Load<6>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<6>(X,p) | |
3377 // | |
3378 // A merge can take a "wide" memory state as one of its narrow inputs. | |
3379 // This simply means that the merge observes out only the relevant parts of | |
3380 // the wide input. That is, wide memory states arriving at narrow merge inputs | |
3381 // are implicitly "filtered" or "sliced" as necessary. (This is rare.) | |
3382 // | |
3383 // These rules imply that MergeMem nodes may cascade (via their <Bot> links), | |
3384 // and that memory slices "leak through": | |
3385 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y)) <==> MergeMem(<Bot>: W, <7>: Y) | |
3386 // | |
3387 // But, in such a cascade, repeated memory slices can "block the leak": | |
3388 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y), <7>: Y') <==> MergeMem(<Bot>: W, <7>: Y') | |
3389 // | |
3390 // In the last example, Y is not part of the combined memory state of the | |
3391 // outermost MergeMem. The system must, of course, prevent unschedulable | |
3392 // memory states from arising, so you can be sure that the state Y is somehow | |
3393 // a precursor to state Y'. | |
3394 // | |
3395 // | |
3396 // REPRESENTATION OF MEMORY MERGES: The indexes used to address the Node::in array | |
3397 // of each MergeMemNode array are exactly the numerical alias indexes, including | |
3398 // but not limited to AliasIdxTop, AliasIdxBot, and AliasIdxRaw. The functions | |
3399 // Compile::alias_type (and kin) produce and manage these indexes. | |
3400 // | |
3401 // By convention, the value of in(AliasIdxTop) (i.e., in(1)) is always the top node. | |
3402 // (Note that this provides quick access to the top node inside MergeMem methods, | |
3403 // without the need to reach out via TLS to Compile::current.) | |
3404 // | |
3405 // As a consequence of what was just described, a MergeMem that represents a full | |
3406 // memory state has an edge in(AliasIdxBot) which is a "wide" memory state, | |
3407 // containing all alias categories. | |
3408 // | |
3409 // MergeMem nodes never (?) have control inputs, so in(0) is NULL. | |
3410 // | |
3411 // All other edges in(N) (including in(AliasIdxRaw), which is in(3)) are either | |
3412 // a memory state for the alias type <N>, or else the top node, meaning that | |
3413 // there is no particular input for that alias type. Note that the length of | |
3414 // a MergeMem is variable, and may be extended at any time to accommodate new | |
3415 // memory states at larger alias indexes. When merges grow, they are of course | |
3416 // filled with "top" in the unused in() positions. | |
3417 // | |
3418 // This use of top is named "empty_memory()", or "empty_mem" (no-memory) as a variable. | |
3419 // (Top was chosen because it works smoothly with passes like GCM.) | |
3420 // | |
3421 // For convenience, we hardwire the alias index for TypeRawPtr::BOTTOM. (It is | |
3422 // the type of random VM bits like TLS references.) Since it is always the | |
3423 // first non-Bot memory slice, some low-level loops use it to initialize an | |
3424 // index variable: for (i = AliasIdxRaw; i < req(); i++). | |
3425 // | |
3426 // | |
3427 // ACCESSORS: There is a special accessor MergeMemNode::base_memory which returns | |
3428 // the distinguished "wide" state. The accessor MergeMemNode::memory_at(N) returns | |
3429 // the memory state for alias type <N>, or (if there is no particular slice at <N>, | |
3430 // it returns the base memory. To prevent bugs, memory_at does not accept <Top> | |
3431 // or <Bot> indexes. The iterator MergeMemStream provides robust iteration over | |
3432 // MergeMem nodes or pairs of such nodes, ensuring that the non-top edges are visited. | |
3433 // | |
3434 // %%%% We may get rid of base_memory as a separate accessor at some point; it isn't | |
3435 // really that different from the other memory inputs. An abbreviation called | |
3436 // "bot_memory()" for "memory_at(AliasIdxBot)" would keep code tidy. | |
3437 // | |
3438 // | |
3439 // PARTIAL MEMORY STATES: During optimization, MergeMem nodes may arise that represent | |
3440 // partial memory states. When a Phi splits through a MergeMem, the copy of the Phi | |
3441 // that "emerges though" the base memory will be marked as excluding the alias types | |
3442 // of the other (narrow-memory) copies which "emerged through" the narrow edges: | |
3443 // | |
3444 // Phi<Bot>(U, MergeMem(<Bot>: W, <8>: Y)) | |
3445 // ==Ideal=> MergeMem(<Bot>: Phi<Bot-8>(U, W), Phi<8>(U, Y)) | |
3446 // | |
3447 // This strange "subtraction" effect is necessary to ensure IGVN convergence. | |
3448 // (It is currently unimplemented.) As you can see, the resulting merge is | |
3449 // actually a disjoint union of memory states, rather than an overlay. | |
3450 // | |
3451 | |
3452 //------------------------------MergeMemNode----------------------------------- | |
3453 Node* MergeMemNode::make_empty_memory() { | |
3454 Node* empty_memory = (Node*) Compile::current()->top(); | |
3455 assert(empty_memory->is_top(), "correct sentinel identity"); | |
3456 return empty_memory; | |
3457 } | |
3458 | |
3459 MergeMemNode::MergeMemNode(Node *new_base) : Node(1+Compile::AliasIdxRaw) { | |
3460 init_class_id(Class_MergeMem); | |
3461 // all inputs are nullified in Node::Node(int) | |
3462 // set_input(0, NULL); // no control input | |
3463 | |
3464 // Initialize the edges uniformly to top, for starters. | |
3465 Node* empty_mem = make_empty_memory(); | |
3466 for (uint i = Compile::AliasIdxTop; i < req(); i++) { | |
3467 init_req(i,empty_mem); | |
3468 } | |
3469 assert(empty_memory() == empty_mem, ""); | |
3470 | |
3471 if( new_base != NULL && new_base->is_MergeMem() ) { | |
3472 MergeMemNode* mdef = new_base->as_MergeMem(); | |
3473 assert(mdef->empty_memory() == empty_mem, "consistent sentinels"); | |
3474 for (MergeMemStream mms(this, mdef); mms.next_non_empty2(); ) { | |
3475 mms.set_memory(mms.memory2()); | |
3476 } | |
3477 assert(base_memory() == mdef->base_memory(), ""); | |
3478 } else { | |
3479 set_base_memory(new_base); | |
3480 } | |
3481 } | |
3482 | |
3483 // Make a new, untransformed MergeMem with the same base as 'mem'. | |
3484 // If mem is itself a MergeMem, populate the result with the same edges. | |
3485 MergeMemNode* MergeMemNode::make(Compile* C, Node* mem) { | |
3486 return new(C, 1+Compile::AliasIdxRaw) MergeMemNode(mem); | |
3487 } | |
3488 | |
3489 //------------------------------cmp-------------------------------------------- | |
3490 uint MergeMemNode::hash() const { return NO_HASH; } | |
3491 uint MergeMemNode::cmp( const Node &n ) const { | |
3492 return (&n == this); // Always fail except on self | |
3493 } | |
3494 | |
3495 //------------------------------Identity--------------------------------------- | |
3496 Node* MergeMemNode::Identity(PhaseTransform *phase) { | |
3497 // Identity if this merge point does not record any interesting memory | |
3498 // disambiguations. | |
3499 Node* base_mem = base_memory(); | |
3500 Node* empty_mem = empty_memory(); | |
3501 if (base_mem != empty_mem) { // Memory path is not dead? | |
3502 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3503 Node* mem = in(i); | |
3504 if (mem != empty_mem && mem != base_mem) { | |
3505 return this; // Many memory splits; no change | |
3506 } | |
3507 } | |
3508 } | |
3509 return base_mem; // No memory splits; ID on the one true input | |
3510 } | |
3511 | |
3512 //------------------------------Ideal------------------------------------------ | |
3513 // This method is invoked recursively on chains of MergeMem nodes | |
3514 Node *MergeMemNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
3515 // Remove chain'd MergeMems | |
3516 // | |
3517 // This is delicate, because the each "in(i)" (i >= Raw) is interpreted | |
3518 // relative to the "in(Bot)". Since we are patching both at the same time, | |
3519 // we have to be careful to read each "in(i)" relative to the old "in(Bot)", | |
3520 // but rewrite each "in(i)" relative to the new "in(Bot)". | |
3521 Node *progress = NULL; | |
3522 | |
3523 | |
3524 Node* old_base = base_memory(); | |
3525 Node* empty_mem = empty_memory(); | |
3526 if (old_base == empty_mem) | |
3527 return NULL; // Dead memory path. | |
3528 | |
3529 MergeMemNode* old_mbase; | |
3530 if (old_base != NULL && old_base->is_MergeMem()) | |
3531 old_mbase = old_base->as_MergeMem(); | |
3532 else | |
3533 old_mbase = NULL; | |
3534 Node* new_base = old_base; | |
3535 | |
3536 // simplify stacked MergeMems in base memory | |
3537 if (old_mbase) new_base = old_mbase->base_memory(); | |
3538 | |
3539 // the base memory might contribute new slices beyond my req() | |
3540 if (old_mbase) grow_to_match(old_mbase); | |
3541 | |
3542 // Look carefully at the base node if it is a phi. | |
3543 PhiNode* phi_base; | |
3544 if (new_base != NULL && new_base->is_Phi()) | |
3545 phi_base = new_base->as_Phi(); | |
3546 else | |
3547 phi_base = NULL; | |
3548 | |
3549 Node* phi_reg = NULL; | |
3550 uint phi_len = (uint)-1; | |
3551 if (phi_base != NULL && !phi_base->is_copy()) { | |
3552 // do not examine phi if degraded to a copy | |
3553 phi_reg = phi_base->region(); | |
3554 phi_len = phi_base->req(); | |
3555 // see if the phi is unfinished | |
3556 for (uint i = 1; i < phi_len; i++) { | |
3557 if (phi_base->in(i) == NULL) { | |
3558 // incomplete phi; do not look at it yet! | |
3559 phi_reg = NULL; | |
3560 phi_len = (uint)-1; | |
3561 break; | |
3562 } | |
3563 } | |
3564 } | |
3565 | |
3566 // Note: We do not call verify_sparse on entry, because inputs | |
3567 // can normalize to the base_memory via subsume_node or similar | |
3568 // mechanisms. This method repairs that damage. | |
3569 | |
3570 assert(!old_mbase || old_mbase->is_empty_memory(empty_mem), "consistent sentinels"); | |
3571 | |
3572 // Look at each slice. | |
3573 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3574 Node* old_in = in(i); | |
3575 // calculate the old memory value | |
3576 Node* old_mem = old_in; | |
3577 if (old_mem == empty_mem) old_mem = old_base; | |
3578 assert(old_mem == memory_at(i), ""); | |
3579 | |
3580 // maybe update (reslice) the old memory value | |
3581 | |
3582 // simplify stacked MergeMems | |
3583 Node* new_mem = old_mem; | |
3584 MergeMemNode* old_mmem; | |
3585 if (old_mem != NULL && old_mem->is_MergeMem()) | |
3586 old_mmem = old_mem->as_MergeMem(); | |
3587 else | |
3588 old_mmem = NULL; | |
3589 if (old_mmem == this) { | |
3590 // This can happen if loops break up and safepoints disappear. | |
3591 // A merge of BotPtr (default) with a RawPtr memory derived from a | |
3592 // safepoint can be rewritten to a merge of the same BotPtr with | |
3593 // the BotPtr phi coming into the loop. If that phi disappears | |
3594 // also, we can end up with a self-loop of the mergemem. | |
3595 // In general, if loops degenerate and memory effects disappear, | |
3596 // a mergemem can be left looking at itself. This simply means | |
3597 // that the mergemem's default should be used, since there is | |
3598 // no longer any apparent effect on this slice. | |
3599 // Note: If a memory slice is a MergeMem cycle, it is unreachable | |
3600 // from start. Update the input to TOP. | |
3601 new_mem = (new_base == this || new_base == empty_mem)? empty_mem : new_base; | |
3602 } | |
3603 else if (old_mmem != NULL) { | |
3604 new_mem = old_mmem->memory_at(i); | |
3605 } | |
3606 // else preceeding memory was not a MergeMem | |
3607 | |
3608 // replace equivalent phis (unfortunately, they do not GVN together) | |
3609 if (new_mem != NULL && new_mem != new_base && | |
3610 new_mem->req() == phi_len && new_mem->in(0) == phi_reg) { | |
3611 if (new_mem->is_Phi()) { | |
3612 PhiNode* phi_mem = new_mem->as_Phi(); | |
3613 for (uint i = 1; i < phi_len; i++) { | |
3614 if (phi_base->in(i) != phi_mem->in(i)) { | |
3615 phi_mem = NULL; | |
3616 break; | |
3617 } | |
3618 } | |
3619 if (phi_mem != NULL) { | |
3620 // equivalent phi nodes; revert to the def | |
3621 new_mem = new_base; | |
3622 } | |
3623 } | |
3624 } | |
3625 | |
3626 // maybe store down a new value | |
3627 Node* new_in = new_mem; | |
3628 if (new_in == new_base) new_in = empty_mem; | |
3629 | |
3630 if (new_in != old_in) { | |
3631 // Warning: Do not combine this "if" with the previous "if" | |
3632 // A memory slice might have be be rewritten even if it is semantically | |
3633 // unchanged, if the base_memory value has changed. | |
3634 set_req(i, new_in); | |
3635 progress = this; // Report progress | |
3636 } | |
3637 } | |
3638 | |
3639 if (new_base != old_base) { | |
3640 set_req(Compile::AliasIdxBot, new_base); | |
3641 // Don't use set_base_memory(new_base), because we need to update du. | |
3642 assert(base_memory() == new_base, ""); | |
3643 progress = this; | |
3644 } | |
3645 | |
3646 if( base_memory() == this ) { | |
3647 // a self cycle indicates this memory path is dead | |
3648 set_req(Compile::AliasIdxBot, empty_mem); | |
3649 } | |
3650 | |
3651 // Resolve external cycles by calling Ideal on a MergeMem base_memory | |
3652 // Recursion must occur after the self cycle check above | |
3653 if( base_memory()->is_MergeMem() ) { | |
3654 MergeMemNode *new_mbase = base_memory()->as_MergeMem(); | |
3655 Node *m = phase->transform(new_mbase); // Rollup any cycles | |
3656 if( m != NULL && (m->is_top() || | |
3657 m->is_MergeMem() && m->as_MergeMem()->base_memory() == empty_mem) ) { | |
3658 // propagate rollup of dead cycle to self | |
3659 set_req(Compile::AliasIdxBot, empty_mem); | |
3660 } | |
3661 } | |
3662 | |
3663 if( base_memory() == empty_mem ) { | |
3664 progress = this; | |
3665 // Cut inputs during Parse phase only. | |
3666 // During Optimize phase a dead MergeMem node will be subsumed by Top. | |
3667 if( !can_reshape ) { | |
3668 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3669 if( in(i) != empty_mem ) { set_req(i, empty_mem); } | |
3670 } | |
3671 } | |
3672 } | |
3673 | |
3674 if( !progress && base_memory()->is_Phi() && can_reshape ) { | |
3675 // Check if PhiNode::Ideal's "Split phis through memory merges" | |
3676 // transform should be attempted. Look for this->phi->this cycle. | |
3677 uint merge_width = req(); | |
3678 if (merge_width > Compile::AliasIdxRaw) { | |
3679 PhiNode* phi = base_memory()->as_Phi(); | |
3680 for( uint i = 1; i < phi->req(); ++i ) {// For all paths in | |
3681 if (phi->in(i) == this) { | |
3682 phase->is_IterGVN()->_worklist.push(phi); | |
3683 break; | |
3684 } | |
3685 } | |
3686 } | |
3687 } | |
3688 | |
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3689 assert(progress || verify_sparse(), "please, no dups of base"); |
0 | 3690 return progress; |
3691 } | |
3692 | |
3693 //-------------------------set_base_memory------------------------------------- | |
3694 void MergeMemNode::set_base_memory(Node *new_base) { | |
3695 Node* empty_mem = empty_memory(); | |
3696 set_req(Compile::AliasIdxBot, new_base); | |
3697 assert(memory_at(req()) == new_base, "must set default memory"); | |
3698 // Clear out other occurrences of new_base: | |
3699 if (new_base != empty_mem) { | |
3700 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3701 if (in(i) == new_base) set_req(i, empty_mem); | |
3702 } | |
3703 } | |
3704 } | |
3705 | |
3706 //------------------------------out_RegMask------------------------------------ | |
3707 const RegMask &MergeMemNode::out_RegMask() const { | |
3708 return RegMask::Empty; | |
3709 } | |
3710 | |
3711 //------------------------------dump_spec-------------------------------------- | |
3712 #ifndef PRODUCT | |
3713 void MergeMemNode::dump_spec(outputStream *st) const { | |
3714 st->print(" {"); | |
3715 Node* base_mem = base_memory(); | |
3716 for( uint i = Compile::AliasIdxRaw; i < req(); i++ ) { | |
3717 Node* mem = memory_at(i); | |
3718 if (mem == base_mem) { st->print(" -"); continue; } | |
3719 st->print( " N%d:", mem->_idx ); | |
3720 Compile::current()->get_adr_type(i)->dump_on(st); | |
3721 } | |
3722 st->print(" }"); | |
3723 } | |
3724 #endif // !PRODUCT | |
3725 | |
3726 | |
3727 #ifdef ASSERT | |
3728 static bool might_be_same(Node* a, Node* b) { | |
3729 if (a == b) return true; | |
3730 if (!(a->is_Phi() || b->is_Phi())) return false; | |
3731 // phis shift around during optimization | |
3732 return true; // pretty stupid... | |
3733 } | |
3734 | |
3735 // verify a narrow slice (either incoming or outgoing) | |
3736 static void verify_memory_slice(const MergeMemNode* m, int alias_idx, Node* n) { | |
3737 if (!VerifyAliases) return; // don't bother to verify unless requested | |
3738 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
3739 if (Node::in_dump()) return; // muzzle asserts when printing | |
3740 assert(alias_idx >= Compile::AliasIdxRaw, "must not disturb base_memory or sentinel"); | |
3741 assert(n != NULL, ""); | |
3742 // Elide intervening MergeMem's | |
3743 while (n->is_MergeMem()) { | |
3744 n = n->as_MergeMem()->memory_at(alias_idx); | |
3745 } | |
3746 Compile* C = Compile::current(); | |
3747 const TypePtr* n_adr_type = n->adr_type(); | |
3748 if (n == m->empty_memory()) { | |
3749 // Implicit copy of base_memory() | |
3750 } else if (n_adr_type != TypePtr::BOTTOM) { | |
3751 assert(n_adr_type != NULL, "new memory must have a well-defined adr_type"); | |
3752 assert(C->must_alias(n_adr_type, alias_idx), "new memory must match selected slice"); | |
3753 } else { | |
3754 // A few places like make_runtime_call "know" that VM calls are narrow, | |
3755 // and can be used to update only the VM bits stored as TypeRawPtr::BOTTOM. | |
3756 bool expected_wide_mem = false; | |
3757 if (n == m->base_memory()) { | |
3758 expected_wide_mem = true; | |
3759 } else if (alias_idx == Compile::AliasIdxRaw || | |
3760 n == m->memory_at(Compile::AliasIdxRaw)) { | |
3761 expected_wide_mem = true; | |
3762 } else if (!C->alias_type(alias_idx)->is_rewritable()) { | |
3763 // memory can "leak through" calls on channels that | |
3764 // are write-once. Allow this also. | |
3765 expected_wide_mem = true; | |
3766 } | |
3767 assert(expected_wide_mem, "expected narrow slice replacement"); | |
3768 } | |
3769 } | |
3770 #else // !ASSERT | |
3771 #define verify_memory_slice(m,i,n) (0) // PRODUCT version is no-op | |
3772 #endif | |
3773 | |
3774 | |
3775 //-----------------------------memory_at--------------------------------------- | |
3776 Node* MergeMemNode::memory_at(uint alias_idx) const { | |
3777 assert(alias_idx >= Compile::AliasIdxRaw || | |
3778 alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, | |
3779 "must avoid base_memory and AliasIdxTop"); | |
3780 | |
3781 // Otherwise, it is a narrow slice. | |
3782 Node* n = alias_idx < req() ? in(alias_idx) : empty_memory(); | |
3783 Compile *C = Compile::current(); | |
3784 if (is_empty_memory(n)) { | |
3785 // the array is sparse; empty slots are the "top" node | |
3786 n = base_memory(); | |
3787 assert(Node::in_dump() | |
3788 || n == NULL || n->bottom_type() == Type::TOP | |
3789 || n->adr_type() == TypePtr::BOTTOM | |
3790 || n->adr_type() == TypeRawPtr::BOTTOM | |
3791 || Compile::current()->AliasLevel() == 0, | |
3792 "must be a wide memory"); | |
3793 // AliasLevel == 0 if we are organizing the memory states manually. | |
3794 // See verify_memory_slice for comments on TypeRawPtr::BOTTOM. | |
3795 } else { | |
3796 // make sure the stored slice is sane | |
3797 #ifdef ASSERT | |
3798 if (is_error_reported() || Node::in_dump()) { | |
3799 } else if (might_be_same(n, base_memory())) { | |
3800 // Give it a pass: It is a mostly harmless repetition of the base. | |
3801 // This can arise normally from node subsumption during optimization. | |
3802 } else { | |
3803 verify_memory_slice(this, alias_idx, n); | |
3804 } | |
3805 #endif | |
3806 } | |
3807 return n; | |
3808 } | |
3809 | |
3810 //---------------------------set_memory_at------------------------------------- | |
3811 void MergeMemNode::set_memory_at(uint alias_idx, Node *n) { | |
3812 verify_memory_slice(this, alias_idx, n); | |
3813 Node* empty_mem = empty_memory(); | |
3814 if (n == base_memory()) n = empty_mem; // collapse default | |
3815 uint need_req = alias_idx+1; | |
3816 if (req() < need_req) { | |
3817 if (n == empty_mem) return; // already the default, so do not grow me | |
3818 // grow the sparse array | |
3819 do { | |
3820 add_req(empty_mem); | |
3821 } while (req() < need_req); | |
3822 } | |
3823 set_req( alias_idx, n ); | |
3824 } | |
3825 | |
3826 | |
3827 | |
3828 //--------------------------iteration_setup------------------------------------ | |
3829 void MergeMemNode::iteration_setup(const MergeMemNode* other) { | |
3830 if (other != NULL) { | |
3831 grow_to_match(other); | |
3832 // invariant: the finite support of mm2 is within mm->req() | |
3833 #ifdef ASSERT | |
3834 for (uint i = req(); i < other->req(); i++) { | |
3835 assert(other->is_empty_memory(other->in(i)), "slice left uncovered"); | |
3836 } | |
3837 #endif | |
3838 } | |
3839 // Replace spurious copies of base_memory by top. | |
3840 Node* base_mem = base_memory(); | |
3841 if (base_mem != NULL && !base_mem->is_top()) { | |
3842 for (uint i = Compile::AliasIdxBot+1, imax = req(); i < imax; i++) { | |
3843 if (in(i) == base_mem) | |
3844 set_req(i, empty_memory()); | |
3845 } | |
3846 } | |
3847 } | |
3848 | |
3849 //---------------------------grow_to_match------------------------------------- | |
3850 void MergeMemNode::grow_to_match(const MergeMemNode* other) { | |
3851 Node* empty_mem = empty_memory(); | |
3852 assert(other->is_empty_memory(empty_mem), "consistent sentinels"); | |
3853 // look for the finite support of the other memory | |
3854 for (uint i = other->req(); --i >= req(); ) { | |
3855 if (other->in(i) != empty_mem) { | |
3856 uint new_len = i+1; | |
3857 while (req() < new_len) add_req(empty_mem); | |
3858 break; | |
3859 } | |
3860 } | |
3861 } | |
3862 | |
3863 //---------------------------verify_sparse------------------------------------- | |
3864 #ifndef PRODUCT | |
3865 bool MergeMemNode::verify_sparse() const { | |
3866 assert(is_empty_memory(make_empty_memory()), "sane sentinel"); | |
3867 Node* base_mem = base_memory(); | |
3868 // The following can happen in degenerate cases, since empty==top. | |
3869 if (is_empty_memory(base_mem)) return true; | |
3870 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3871 assert(in(i) != NULL, "sane slice"); | |
3872 if (in(i) == base_mem) return false; // should have been the sentinel value! | |
3873 } | |
3874 return true; | |
3875 } | |
3876 | |
3877 bool MergeMemStream::match_memory(Node* mem, const MergeMemNode* mm, int idx) { | |
3878 Node* n; | |
3879 n = mm->in(idx); | |
3880 if (mem == n) return true; // might be empty_memory() | |
3881 n = (idx == Compile::AliasIdxBot)? mm->base_memory(): mm->memory_at(idx); | |
3882 if (mem == n) return true; | |
3883 while (n->is_Phi() && (n = n->as_Phi()->is_copy()) != NULL) { | |
3884 if (mem == n) return true; | |
3885 if (n == NULL) break; | |
3886 } | |
3887 return false; | |
3888 } | |
3889 #endif // !PRODUCT |