Mercurial > hg > truffle
annotate src/share/vm/opto/memnode.cpp @ 169:9148c65abefc
6695049: (coll) Create an x86 intrinsic for Arrays.equals
Summary: Intrinsify java/util/Arrays.equals(char[], char[])
Reviewed-by: kvn, never
author | rasbold |
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date | Thu, 29 May 2008 16:22:09 -0700 |
parents | 7793bd37a336 |
children | 44a553b2809d |
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(); |
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94 if (tinst == NULL || !tinst->is_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(); |
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128 bool is_instance = (t_oop != NULL) && t_oop->is_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 || |
137 t->isa_oopptr() && !t->is_oopptr()->is_instance() && | |
138 t->is_oopptr()->cast_to_instance(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'. |
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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->is_Con() || dom->is_Start() || dom->is_Root() || dom == sub) |
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262 return true; |
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263 |
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264 // 'dom' dominates 'sub' if its control edge and control edges |
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265 // of all its inputs dominate or equal to sub's control edge. |
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266 |
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267 // Currently 'sub' is either Allocate, Initialize or Start nodes. |
163 | 268 // Or Region for the check in LoadNode::Ideal(); |
269 // 'sub' should have sub->in(0) != NULL. | |
270 assert(sub->is_Allocate() || sub->is_Initialize() || sub->is_Start() || | |
271 sub->is_Region(), "expecting only these nodes"); | |
119
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272 |
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273 // Get control edge of 'sub'. |
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274 sub = sub->find_exact_control(sub->in(0)); |
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275 if (sub == NULL || sub->is_top()) |
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276 return false; // Conservative answer for dead code |
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277 |
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278 assert(sub->is_CFG(), "expecting control"); |
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279 |
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280 if (sub == dom) |
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281 return true; |
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282 |
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283 if (sub->is_Start() || sub->is_Root()) |
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284 return false; |
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285 |
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286 { |
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287 // Check all control edges of 'dom'. |
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288 |
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289 ResourceMark rm; |
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290 Arena* arena = Thread::current()->resource_area(); |
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291 Node_List nlist(arena); |
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292 Unique_Node_List dom_list(arena); |
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293 |
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294 dom_list.push(dom); |
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295 bool only_dominating_controls = false; |
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296 |
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297 for (uint next = 0; next < dom_list.size(); next++) { |
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298 Node* n = dom_list.at(next); |
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299 if (!n->is_CFG() && n->pinned()) { |
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300 // Check only own control edge for pinned non-control nodes. |
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301 n = n->find_exact_control(n->in(0)); |
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302 if (n == NULL || n->is_top()) |
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303 return false; // Conservative answer for dead code |
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304 assert(n->is_CFG(), "expecting control"); |
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305 } |
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306 if (n->is_Con() || n->is_Start() || n->is_Root()) { |
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307 only_dominating_controls = true; |
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308 } else if (n->is_CFG()) { |
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309 if (n->dominates(sub, nlist)) |
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310 only_dominating_controls = true; |
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311 else |
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312 return false; |
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313 } else { |
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314 // First, own control edge. |
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315 Node* m = n->find_exact_control(n->in(0)); |
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316 if (m != NULL) { |
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317 if (m->is_top()) |
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318 return false; // Conservative answer for dead code |
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319 dom_list.push(m); |
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320 } |
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321 // Now, the rest of edges. |
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322 uint cnt = n->req(); |
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323 for (uint i = 1; i < cnt; i++) { |
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324 m = n->find_exact_control(n->in(i)); |
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325 if (m == NULL || m->is_top()) |
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326 continue; |
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327 dom_list.push(m); |
0 | 328 } |
329 } | |
330 } | |
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331 return only_dominating_controls; |
0 | 332 } |
333 } | |
334 | |
335 //---------------------detect_ptr_independence--------------------------------- | |
336 // Used by MemNode::find_previous_store to prove that two base | |
337 // pointers are never equal. | |
338 // The pointers are accompanied by their associated allocations, | |
339 // if any, which have been previously discovered by the caller. | |
340 bool MemNode::detect_ptr_independence(Node* p1, AllocateNode* a1, | |
341 Node* p2, AllocateNode* a2, | |
342 PhaseTransform* phase) { | |
343 // Attempt to prove that these two pointers cannot be aliased. | |
344 // They may both manifestly be allocations, and they should differ. | |
345 // Or, if they are not both allocations, they can be distinct constants. | |
346 // Otherwise, one is an allocation and the other a pre-existing value. | |
347 if (a1 == NULL && a2 == NULL) { // neither an allocation | |
348 return (p1 != p2) && p1->is_Con() && p2->is_Con(); | |
349 } else if (a1 != NULL && a2 != NULL) { // both allocations | |
350 return (a1 != a2); | |
351 } else if (a1 != NULL) { // one allocation a1 | |
352 // (Note: p2->is_Con implies p2->in(0)->is_Root, which dominates.) | |
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353 return all_controls_dominate(p2, a1); |
0 | 354 } else { //(a2 != NULL) // one allocation a2 |
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355 return all_controls_dominate(p1, a2); |
0 | 356 } |
357 return false; | |
358 } | |
359 | |
360 | |
361 // The logic for reordering loads and stores uses four steps: | |
362 // (a) Walk carefully past stores and initializations which we | |
363 // can prove are independent of this load. | |
364 // (b) Observe that the next memory state makes an exact match | |
365 // with self (load or store), and locate the relevant store. | |
366 // (c) Ensure that, if we were to wire self directly to the store, | |
367 // the optimizer would fold it up somehow. | |
368 // (d) Do the rewiring, and return, depending on some other part of | |
369 // the optimizer to fold up the load. | |
370 // This routine handles steps (a) and (b). Steps (c) and (d) are | |
371 // specific to loads and stores, so they are handled by the callers. | |
372 // (Currently, only LoadNode::Ideal has steps (c), (d). More later.) | |
373 // | |
374 Node* MemNode::find_previous_store(PhaseTransform* phase) { | |
375 Node* ctrl = in(MemNode::Control); | |
376 Node* adr = in(MemNode::Address); | |
377 intptr_t offset = 0; | |
378 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
379 AllocateNode* alloc = AllocateNode::Ideal_allocation(base, phase); | |
380 | |
381 if (offset == Type::OffsetBot) | |
382 return NULL; // cannot unalias unless there are precise offsets | |
383 | |
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384 const TypeOopPtr *addr_t = adr->bottom_type()->isa_oopptr(); |
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385 |
0 | 386 intptr_t size_in_bytes = memory_size(); |
387 | |
388 Node* mem = in(MemNode::Memory); // start searching here... | |
389 | |
390 int cnt = 50; // Cycle limiter | |
391 for (;;) { // While we can dance past unrelated stores... | |
392 if (--cnt < 0) break; // Caught in cycle or a complicated dance? | |
393 | |
394 if (mem->is_Store()) { | |
395 Node* st_adr = mem->in(MemNode::Address); | |
396 intptr_t st_offset = 0; | |
397 Node* st_base = AddPNode::Ideal_base_and_offset(st_adr, phase, st_offset); | |
398 if (st_base == NULL) | |
399 break; // inscrutable pointer | |
400 if (st_offset != offset && st_offset != Type::OffsetBot) { | |
401 const int MAX_STORE = BytesPerLong; | |
402 if (st_offset >= offset + size_in_bytes || | |
403 st_offset <= offset - MAX_STORE || | |
404 st_offset <= offset - mem->as_Store()->memory_size()) { | |
405 // Success: The offsets are provably independent. | |
406 // (You may ask, why not just test st_offset != offset and be done? | |
407 // The answer is that stores of different sizes can co-exist | |
408 // in the same sequence of RawMem effects. We sometimes initialize | |
409 // a whole 'tile' of array elements with a single jint or jlong.) | |
410 mem = mem->in(MemNode::Memory); | |
411 continue; // (a) advance through independent store memory | |
412 } | |
413 } | |
414 if (st_base != base && | |
415 detect_ptr_independence(base, alloc, | |
416 st_base, | |
417 AllocateNode::Ideal_allocation(st_base, phase), | |
418 phase)) { | |
419 // Success: The bases are provably independent. | |
420 mem = mem->in(MemNode::Memory); | |
421 continue; // (a) advance through independent store memory | |
422 } | |
423 | |
424 // (b) At this point, if the bases or offsets do not agree, we lose, | |
425 // since we have not managed to prove 'this' and 'mem' independent. | |
426 if (st_base == base && st_offset == offset) { | |
427 return mem; // let caller handle steps (c), (d) | |
428 } | |
429 | |
430 } else if (mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
431 InitializeNode* st_init = mem->in(0)->as_Initialize(); | |
432 AllocateNode* st_alloc = st_init->allocation(); | |
433 if (st_alloc == NULL) | |
434 break; // something degenerated | |
435 bool known_identical = false; | |
436 bool known_independent = false; | |
437 if (alloc == st_alloc) | |
438 known_identical = true; | |
439 else if (alloc != NULL) | |
440 known_independent = true; | |
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441 else if (all_controls_dominate(this, st_alloc)) |
0 | 442 known_independent = true; |
443 | |
444 if (known_independent) { | |
445 // The bases are provably independent: Either they are | |
446 // manifestly distinct allocations, or else the control | |
447 // of this load dominates the store's allocation. | |
448 int alias_idx = phase->C->get_alias_index(adr_type()); | |
449 if (alias_idx == Compile::AliasIdxRaw) { | |
450 mem = st_alloc->in(TypeFunc::Memory); | |
451 } else { | |
452 mem = st_init->memory(alias_idx); | |
453 } | |
454 continue; // (a) advance through independent store memory | |
455 } | |
456 | |
457 // (b) at this point, if we are not looking at a store initializing | |
458 // the same allocation we are loading from, we lose. | |
459 if (known_identical) { | |
460 // From caller, can_see_stored_value will consult find_captured_store. | |
461 return mem; // let caller handle steps (c), (d) | |
462 } | |
463 | |
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464 } else if (addr_t != NULL && addr_t->is_instance_field()) { |
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465 // Can't use optimize_simple_memory_chain() since it needs PhaseGVN. |
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466 if (mem->is_Proj() && mem->in(0)->is_Call()) { |
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467 CallNode *call = mem->in(0)->as_Call(); |
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468 if (!call->may_modify(addr_t, phase)) { |
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469 mem = call->in(TypeFunc::Memory); |
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470 continue; // (a) advance through independent call memory |
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471 } |
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472 } else if (mem->is_Proj() && mem->in(0)->is_MemBar()) { |
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473 mem = mem->in(0)->in(TypeFunc::Memory); |
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474 continue; // (a) advance through independent MemBar memory |
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475 } else if (mem->is_MergeMem()) { |
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476 int alias_idx = phase->C->get_alias_index(adr_type()); |
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477 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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478 continue; // (a) advance through independent MergeMem memory |
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479 } |
0 | 480 } |
481 | |
482 // Unless there is an explicit 'continue', we must bail out here, | |
483 // because 'mem' is an inscrutable memory state (e.g., a call). | |
484 break; | |
485 } | |
486 | |
487 return NULL; // bail out | |
488 } | |
489 | |
490 //----------------------calculate_adr_type------------------------------------- | |
491 // Helper function. Notices when the given type of address hits top or bottom. | |
492 // Also, asserts a cross-check of the type against the expected address type. | |
493 const TypePtr* MemNode::calculate_adr_type(const Type* t, const TypePtr* cross_check) { | |
494 if (t == Type::TOP) return NULL; // does not touch memory any more? | |
495 #ifdef PRODUCT | |
496 cross_check = NULL; | |
497 #else | |
498 if (!VerifyAliases || is_error_reported() || Node::in_dump()) cross_check = NULL; | |
499 #endif | |
500 const TypePtr* tp = t->isa_ptr(); | |
501 if (tp == NULL) { | |
502 assert(cross_check == NULL || cross_check == TypePtr::BOTTOM, "expected memory type must be wide"); | |
503 return TypePtr::BOTTOM; // touches lots of memory | |
504 } else { | |
505 #ifdef ASSERT | |
506 // %%%% [phh] We don't check the alias index if cross_check is | |
507 // TypeRawPtr::BOTTOM. Needs to be investigated. | |
508 if (cross_check != NULL && | |
509 cross_check != TypePtr::BOTTOM && | |
510 cross_check != TypeRawPtr::BOTTOM) { | |
511 // Recheck the alias index, to see if it has changed (due to a bug). | |
512 Compile* C = Compile::current(); | |
513 assert(C->get_alias_index(cross_check) == C->get_alias_index(tp), | |
514 "must stay in the original alias category"); | |
515 // The type of the address must be contained in the adr_type, | |
516 // disregarding "null"-ness. | |
517 // (We make an exception for TypeRawPtr::BOTTOM, which is a bit bucket.) | |
518 const TypePtr* tp_notnull = tp->join(TypePtr::NOTNULL)->is_ptr(); | |
519 assert(cross_check->meet(tp_notnull) == cross_check, | |
520 "real address must not escape from expected memory type"); | |
521 } | |
522 #endif | |
523 return tp; | |
524 } | |
525 } | |
526 | |
527 //------------------------adr_phi_is_loop_invariant---------------------------- | |
528 // A helper function for Ideal_DU_postCCP to check if a Phi in a counted | |
529 // loop is loop invariant. Make a quick traversal of Phi and associated | |
530 // CastPP nodes, looking to see if they are a closed group within the loop. | |
531 bool MemNode::adr_phi_is_loop_invariant(Node* adr_phi, Node* cast) { | |
532 // The idea is that the phi-nest must boil down to only CastPP nodes | |
533 // with the same data. This implies that any path into the loop already | |
534 // includes such a CastPP, and so the original cast, whatever its input, | |
535 // must be covered by an equivalent cast, with an earlier control input. | |
536 ResourceMark rm; | |
537 | |
538 // The loop entry input of the phi should be the unique dominating | |
539 // node for every Phi/CastPP in the loop. | |
540 Unique_Node_List closure; | |
541 closure.push(adr_phi->in(LoopNode::EntryControl)); | |
542 | |
543 // Add the phi node and the cast to the worklist. | |
544 Unique_Node_List worklist; | |
545 worklist.push(adr_phi); | |
546 if( cast != NULL ){ | |
547 if( !cast->is_ConstraintCast() ) return false; | |
548 worklist.push(cast); | |
549 } | |
550 | |
551 // Begin recursive walk of phi nodes. | |
552 while( worklist.size() ){ | |
553 // Take a node off the worklist | |
554 Node *n = worklist.pop(); | |
555 if( !closure.member(n) ){ | |
556 // Add it to the closure. | |
557 closure.push(n); | |
558 // Make a sanity check to ensure we don't waste too much time here. | |
559 if( closure.size() > 20) return false; | |
560 // This node is OK if: | |
561 // - it is a cast of an identical value | |
562 // - or it is a phi node (then we add its inputs to the worklist) | |
563 // Otherwise, the node is not OK, and we presume the cast is not invariant | |
564 if( n->is_ConstraintCast() ){ | |
565 worklist.push(n->in(1)); | |
566 } else if( n->is_Phi() ) { | |
567 for( uint i = 1; i < n->req(); i++ ) { | |
568 worklist.push(n->in(i)); | |
569 } | |
570 } else { | |
571 return false; | |
572 } | |
573 } | |
574 } | |
575 | |
576 // Quit when the worklist is empty, and we've found no offending nodes. | |
577 return true; | |
578 } | |
579 | |
580 //------------------------------Ideal_DU_postCCP------------------------------- | |
581 // Find any cast-away of null-ness and keep its control. Null cast-aways are | |
582 // going away in this pass and we need to make this memory op depend on the | |
583 // gating null check. | |
163 | 584 Node *MemNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
585 return Ideal_common_DU_postCCP(ccp, this, in(MemNode::Address)); | |
586 } | |
0 | 587 |
588 // I tried to leave the CastPP's in. This makes the graph more accurate in | |
589 // some sense; we get to keep around the knowledge that an oop is not-null | |
590 // after some test. Alas, the CastPP's interfere with GVN (some values are | |
591 // the regular oop, some are the CastPP of the oop, all merge at Phi's which | |
592 // cannot collapse, etc). This cost us 10% on SpecJVM, even when I removed | |
593 // some of the more trivial cases in the optimizer. Removing more useless | |
594 // Phi's started allowing Loads to illegally float above null checks. I gave | |
595 // up on this approach. CNC 10/20/2000 | |
163 | 596 // This static method may be called not from MemNode (EncodePNode calls it). |
597 // Only the control edge of the node 'n' might be updated. | |
598 Node *MemNode::Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr ) { | |
0 | 599 Node *skipped_cast = NULL; |
600 // Need a null check? Regular static accesses do not because they are | |
601 // from constant addresses. Array ops are gated by the range check (which | |
602 // always includes a NULL check). Just check field ops. | |
163 | 603 if( n->in(MemNode::Control) == NULL ) { |
0 | 604 // Scan upwards for the highest location we can place this memory op. |
605 while( true ) { | |
606 switch( adr->Opcode() ) { | |
607 | |
608 case Op_AddP: // No change to NULL-ness, so peek thru AddP's | |
609 adr = adr->in(AddPNode::Base); | |
610 continue; | |
611 | |
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612 case Op_DecodeN: // No change to NULL-ness, so peek thru |
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613 adr = adr->in(1); |
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614 continue; |
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615 |
0 | 616 case Op_CastPP: |
617 // If the CastPP is useless, just peek on through it. | |
618 if( ccp->type(adr) == ccp->type(adr->in(1)) ) { | |
619 // Remember the cast that we've peeked though. If we peek | |
620 // through more than one, then we end up remembering the highest | |
621 // one, that is, if in a loop, the one closest to the top. | |
622 skipped_cast = adr; | |
623 adr = adr->in(1); | |
624 continue; | |
625 } | |
626 // CastPP is going away in this pass! We need this memory op to be | |
627 // control-dependent on the test that is guarding the CastPP. | |
163 | 628 ccp->hash_delete(n); |
629 n->set_req(MemNode::Control, adr->in(0)); | |
630 ccp->hash_insert(n); | |
631 return n; | |
0 | 632 |
633 case Op_Phi: | |
634 // Attempt to float above a Phi to some dominating point. | |
635 if (adr->in(0) != NULL && adr->in(0)->is_CountedLoop()) { | |
636 // If we've already peeked through a Cast (which could have set the | |
637 // control), we can't float above a Phi, because the skipped Cast | |
638 // may not be loop invariant. | |
639 if (adr_phi_is_loop_invariant(adr, skipped_cast)) { | |
640 adr = adr->in(1); | |
641 continue; | |
642 } | |
643 } | |
644 | |
645 // Intentional fallthrough! | |
646 | |
647 // No obvious dominating point. The mem op is pinned below the Phi | |
648 // by the Phi itself. If the Phi goes away (no true value is merged) | |
649 // then the mem op can float, but not indefinitely. It must be pinned | |
650 // behind the controls leading to the Phi. | |
651 case Op_CheckCastPP: | |
652 // These usually stick around to change address type, however a | |
653 // useless one can be elided and we still need to pick up a control edge | |
654 if (adr->in(0) == NULL) { | |
655 // This CheckCastPP node has NO control and is likely useless. But we | |
656 // need check further up the ancestor chain for a control input to keep | |
657 // the node in place. 4959717. | |
658 skipped_cast = adr; | |
659 adr = adr->in(1); | |
660 continue; | |
661 } | |
163 | 662 ccp->hash_delete(n); |
663 n->set_req(MemNode::Control, adr->in(0)); | |
664 ccp->hash_insert(n); | |
665 return n; | |
0 | 666 |
667 // List of "safe" opcodes; those that implicitly block the memory | |
668 // op below any null check. | |
669 case Op_CastX2P: // no null checks on native pointers | |
670 case Op_Parm: // 'this' pointer is not null | |
671 case Op_LoadP: // Loading from within a klass | |
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672 case Op_LoadN: // Loading from within a klass |
0 | 673 case Op_LoadKlass: // Loading from within a klass |
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674 case Op_LoadNKlass: // Loading from within a klass |
0 | 675 case Op_ConP: // Loading from a klass |
163 | 676 case Op_ConN: // Loading from a klass |
0 | 677 case Op_CreateEx: // Sucking up the guts of an exception oop |
678 case Op_Con: // Reading from TLS | |
679 case Op_CMoveP: // CMoveP is pinned | |
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680 case Op_CMoveN: // CMoveN is pinned |
0 | 681 break; // No progress |
682 | |
683 case Op_Proj: // Direct call to an allocation routine | |
684 case Op_SCMemProj: // Memory state from store conditional ops | |
685 #ifdef ASSERT | |
686 { | |
687 assert(adr->as_Proj()->_con == TypeFunc::Parms, "must be return value"); | |
688 const Node* call = adr->in(0); | |
163 | 689 if (call->is_CallJava()) { |
690 const CallJavaNode* call_java = call->as_CallJava(); | |
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691 const TypeTuple *r = call_java->tf()->range(); |
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692 assert(r->cnt() > TypeFunc::Parms, "must return value"); |
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693 const Type* ret_type = r->field_at(TypeFunc::Parms); |
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694 assert(ret_type && ret_type->isa_ptr(), "must return pointer"); |
0 | 695 // We further presume that this is one of |
696 // new_instance_Java, new_array_Java, or | |
697 // the like, but do not assert for this. | |
698 } else if (call->is_Allocate()) { | |
699 // similar case to new_instance_Java, etc. | |
700 } else if (!call->is_CallLeaf()) { | |
701 // Projections from fetch_oop (OSR) are allowed as well. | |
702 ShouldNotReachHere(); | |
703 } | |
704 } | |
705 #endif | |
706 break; | |
707 default: | |
708 ShouldNotReachHere(); | |
709 } | |
710 break; | |
711 } | |
712 } | |
713 | |
714 return NULL; // No progress | |
715 } | |
716 | |
717 | |
718 //============================================================================= | |
719 uint LoadNode::size_of() const { return sizeof(*this); } | |
720 uint LoadNode::cmp( const Node &n ) const | |
721 { return !Type::cmp( _type, ((LoadNode&)n)._type ); } | |
722 const Type *LoadNode::bottom_type() const { return _type; } | |
723 uint LoadNode::ideal_reg() const { | |
724 return Matcher::base2reg[_type->base()]; | |
725 } | |
726 | |
727 #ifndef PRODUCT | |
728 void LoadNode::dump_spec(outputStream *st) const { | |
729 MemNode::dump_spec(st); | |
730 if( !Verbose && !WizardMode ) { | |
731 // standard dump does this in Verbose and WizardMode | |
732 st->print(" #"); _type->dump_on(st); | |
733 } | |
734 } | |
735 #endif | |
736 | |
737 | |
738 //----------------------------LoadNode::make----------------------------------- | |
739 // Polymorphic factory method: | |
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740 Node *LoadNode::make( PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const TypePtr* adr_type, const Type *rt, BasicType bt ) { |
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741 Compile* C = gvn.C; |
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742 |
0 | 743 // sanity check the alias category against the created node type |
744 assert(!(adr_type->isa_oopptr() && | |
745 adr_type->offset() == oopDesc::klass_offset_in_bytes()), | |
746 "use LoadKlassNode instead"); | |
747 assert(!(adr_type->isa_aryptr() && | |
748 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()), | |
749 "use LoadRangeNode instead"); | |
750 switch (bt) { | |
751 case T_BOOLEAN: | |
752 case T_BYTE: return new (C, 3) LoadBNode(ctl, mem, adr, adr_type, rt->is_int() ); | |
753 case T_INT: return new (C, 3) LoadINode(ctl, mem, adr, adr_type, rt->is_int() ); | |
754 case T_CHAR: return new (C, 3) LoadCNode(ctl, mem, adr, adr_type, rt->is_int() ); | |
755 case T_SHORT: return new (C, 3) LoadSNode(ctl, mem, adr, adr_type, rt->is_int() ); | |
756 case T_LONG: return new (C, 3) LoadLNode(ctl, mem, adr, adr_type, rt->is_long() ); | |
757 case T_FLOAT: return new (C, 3) LoadFNode(ctl, mem, adr, adr_type, rt ); | |
758 case T_DOUBLE: return new (C, 3) LoadDNode(ctl, mem, adr, adr_type, rt ); | |
759 case T_ADDRESS: return new (C, 3) LoadPNode(ctl, mem, adr, adr_type, rt->is_ptr() ); | |
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760 case T_OBJECT: |
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761 #ifdef _LP64 |
163 | 762 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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763 const TypeNarrowOop* narrowtype; |
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764 if (rt->isa_narrowoop()) { |
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765 narrowtype = rt->is_narrowoop(); |
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766 } else { |
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767 narrowtype = rt->is_oopptr()->make_narrowoop(); |
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768 } |
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769 Node* load = gvn.transform(new (C, 3) LoadNNode(ctl, mem, adr, adr_type, narrowtype)); |
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770 |
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771 return DecodeNNode::decode(&gvn, load); |
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772 } else |
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773 #endif |
163 | 774 { |
775 assert(!adr->bottom_type()->is_ptr_to_narrowoop(), "should have got back a narrow oop"); | |
776 return new (C, 3) LoadPNode(ctl, mem, adr, adr_type, rt->is_oopptr()); | |
777 } | |
0 | 778 } |
779 ShouldNotReachHere(); | |
780 return (LoadNode*)NULL; | |
781 } | |
782 | |
783 LoadLNode* LoadLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt) { | |
784 bool require_atomic = true; | |
785 return new (C, 3) LoadLNode(ctl, mem, adr, adr_type, rt->is_long(), require_atomic); | |
786 } | |
787 | |
788 | |
789 | |
790 | |
791 //------------------------------hash------------------------------------------- | |
792 uint LoadNode::hash() const { | |
793 // unroll addition of interesting fields | |
794 return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address); | |
795 } | |
796 | |
797 //---------------------------can_see_stored_value------------------------------ | |
798 // This routine exists to make sure this set of tests is done the same | |
799 // everywhere. We need to make a coordinated change: first LoadNode::Ideal | |
800 // will change the graph shape in a way which makes memory alive twice at the | |
801 // same time (uses the Oracle model of aliasing), then some | |
802 // LoadXNode::Identity will fold things back to the equivalence-class model | |
803 // of aliasing. | |
804 Node* MemNode::can_see_stored_value(Node* st, PhaseTransform* phase) const { | |
805 Node* ld_adr = in(MemNode::Address); | |
806 | |
17
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807 const TypeInstPtr* tp = phase->type(ld_adr)->isa_instptr(); |
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808 Compile::AliasType* atp = tp != NULL ? phase->C->alias_type(tp) : NULL; |
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809 if (EliminateAutoBox && atp != NULL && atp->index() >= Compile::AliasIdxRaw && |
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810 atp->field() != NULL && !atp->field()->is_volatile()) { |
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811 uint alias_idx = atp->index(); |
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812 bool final = atp->field()->is_final(); |
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813 Node* result = NULL; |
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814 Node* current = st; |
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815 // Skip through chains of MemBarNodes checking the MergeMems for |
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816 // new states for the slice of this load. Stop once any other |
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817 // kind of node is encountered. Loads from final memory can skip |
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818 // through any kind of MemBar but normal loads shouldn't skip |
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819 // through MemBarAcquire since the could allow them to move out of |
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820 // a synchronized region. |
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821 while (current->is_Proj()) { |
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822 int opc = current->in(0)->Opcode(); |
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823 if ((final && opc == Op_MemBarAcquire) || |
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824 opc == Op_MemBarRelease || opc == Op_MemBarCPUOrder) { |
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825 Node* mem = current->in(0)->in(TypeFunc::Memory); |
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826 if (mem->is_MergeMem()) { |
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827 MergeMemNode* merge = mem->as_MergeMem(); |
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828 Node* new_st = merge->memory_at(alias_idx); |
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829 if (new_st == merge->base_memory()) { |
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830 // Keep searching |
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831 current = merge->base_memory(); |
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832 continue; |
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833 } |
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834 // Save the new memory state for the slice and fall through |
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835 // to exit. |
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836 result = new_st; |
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837 } |
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838 } |
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839 break; |
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840 } |
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841 if (result != NULL) { |
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842 st = result; |
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843 } |
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844 } |
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845 |
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846 |
0 | 847 // Loop around twice in the case Load -> Initialize -> Store. |
848 // (See PhaseIterGVN::add_users_to_worklist, which knows about this case.) | |
849 for (int trip = 0; trip <= 1; trip++) { | |
850 | |
851 if (st->is_Store()) { | |
852 Node* st_adr = st->in(MemNode::Address); | |
853 if (!phase->eqv(st_adr, ld_adr)) { | |
854 // Try harder before giving up... Match raw and non-raw pointers. | |
855 intptr_t st_off = 0; | |
856 AllocateNode* alloc = AllocateNode::Ideal_allocation(st_adr, phase, st_off); | |
857 if (alloc == NULL) return NULL; | |
858 intptr_t ld_off = 0; | |
859 AllocateNode* allo2 = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off); | |
860 if (alloc != allo2) return NULL; | |
861 if (ld_off != st_off) return NULL; | |
862 // At this point we have proven something like this setup: | |
863 // A = Allocate(...) | |
864 // L = LoadQ(, AddP(CastPP(, A.Parm),, #Off)) | |
865 // S = StoreQ(, AddP(, A.Parm , #Off), V) | |
866 // (Actually, we haven't yet proven the Q's are the same.) | |
867 // In other words, we are loading from a casted version of | |
868 // the same pointer-and-offset that we stored to. | |
869 // Thus, we are able to replace L by V. | |
870 } | |
871 // Now prove that we have a LoadQ matched to a StoreQ, for some Q. | |
872 if (store_Opcode() != st->Opcode()) | |
873 return NULL; | |
874 return st->in(MemNode::ValueIn); | |
875 } | |
876 | |
877 intptr_t offset = 0; // scratch | |
878 | |
879 // A load from a freshly-created object always returns zero. | |
880 // (This can happen after LoadNode::Ideal resets the load's memory input | |
881 // to find_captured_store, which returned InitializeNode::zero_memory.) | |
882 if (st->is_Proj() && st->in(0)->is_Allocate() && | |
883 st->in(0) == AllocateNode::Ideal_allocation(ld_adr, phase, offset) && | |
884 offset >= st->in(0)->as_Allocate()->minimum_header_size()) { | |
885 // return a zero value for the load's basic type | |
886 // (This is one of the few places where a generic PhaseTransform | |
887 // can create new nodes. Think of it as lazily manifesting | |
888 // virtually pre-existing constants.) | |
889 return phase->zerocon(memory_type()); | |
890 } | |
891 | |
892 // A load from an initialization barrier can match a captured store. | |
893 if (st->is_Proj() && st->in(0)->is_Initialize()) { | |
894 InitializeNode* init = st->in(0)->as_Initialize(); | |
895 AllocateNode* alloc = init->allocation(); | |
896 if (alloc != NULL && | |
897 alloc == AllocateNode::Ideal_allocation(ld_adr, phase, offset)) { | |
898 // examine a captured store value | |
899 st = init->find_captured_store(offset, memory_size(), phase); | |
900 if (st != NULL) | |
901 continue; // take one more trip around | |
902 } | |
903 } | |
904 | |
905 break; | |
906 } | |
907 | |
908 return NULL; | |
909 } | |
910 | |
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911 //----------------------is_instance_field_load_with_local_phi------------------ |
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912 bool LoadNode::is_instance_field_load_with_local_phi(Node* ctrl) { |
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913 if( in(MemNode::Memory)->is_Phi() && in(MemNode::Memory)->in(0) == ctrl && |
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914 in(MemNode::Address)->is_AddP() ) { |
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915 const TypeOopPtr* t_oop = in(MemNode::Address)->bottom_type()->isa_oopptr(); |
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916 // Only instances. |
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917 if( t_oop != NULL && t_oop->is_instance_field() && |
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918 t_oop->offset() != Type::OffsetBot && |
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919 t_oop->offset() != Type::OffsetTop) { |
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920 return true; |
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921 } |
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922 } |
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923 return false; |
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924 } |
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925 |
0 | 926 //------------------------------Identity--------------------------------------- |
927 // Loads are identity if previous store is to same address | |
928 Node *LoadNode::Identity( PhaseTransform *phase ) { | |
929 // If the previous store-maker is the right kind of Store, and the store is | |
930 // to the same address, then we are equal to the value stored. | |
931 Node* mem = in(MemNode::Memory); | |
932 Node* value = can_see_stored_value(mem, phase); | |
933 if( value ) { | |
934 // byte, short & char stores truncate naturally. | |
935 // A load has to load the truncated value which requires | |
936 // some sort of masking operation and that requires an | |
937 // Ideal call instead of an Identity call. | |
938 if (memory_size() < BytesPerInt) { | |
939 // If the input to the store does not fit with the load's result type, | |
940 // it must be truncated via an Ideal call. | |
941 if (!phase->type(value)->higher_equal(phase->type(this))) | |
942 return this; | |
943 } | |
944 // (This works even when value is a Con, but LoadNode::Value | |
945 // usually runs first, producing the singleton type of the Con.) | |
946 return value; | |
947 } | |
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948 |
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949 // Search for an existing data phi which was generated before for the same |
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950 // instance's field to avoid infinite genertion of phis in a loop. |
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951 Node *region = mem->in(0); |
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952 if (is_instance_field_load_with_local_phi(region)) { |
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953 const TypePtr *addr_t = in(MemNode::Address)->bottom_type()->isa_ptr(); |
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954 int this_index = phase->C->get_alias_index(addr_t); |
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955 int this_offset = addr_t->offset(); |
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956 int this_id = addr_t->is_oopptr()->instance_id(); |
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957 const Type* this_type = bottom_type(); |
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958 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
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959 Node* phi = region->fast_out(i); |
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960 if (phi->is_Phi() && phi != mem && |
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961 phi->as_Phi()->is_same_inst_field(this_type, this_id, this_index, this_offset)) { |
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962 return phi; |
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963 } |
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964 } |
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965 } |
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966 |
0 | 967 return this; |
968 } | |
969 | |
17
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970 |
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971 // Returns true if the AliasType refers to the field that holds the |
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972 // cached box array. Currently only handles the IntegerCache case. |
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973 static bool is_autobox_cache(Compile::AliasType* atp) { |
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974 if (atp != NULL && atp->field() != NULL) { |
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975 ciField* field = atp->field(); |
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976 ciSymbol* klass = field->holder()->name(); |
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977 if (field->name() == ciSymbol::cache_field_name() && |
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978 field->holder()->uses_default_loader() && |
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979 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
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980 return true; |
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|
981 } |
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|
982 } |
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|
983 return false; |
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|
984 } |
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|
985 |
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986 // Fetch the base value in the autobox array |
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987 static bool fetch_autobox_base(Compile::AliasType* atp, int& cache_offset) { |
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988 if (atp != NULL && atp->field() != NULL) { |
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989 ciField* field = atp->field(); |
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changeset
|
990 ciSymbol* klass = field->holder()->name(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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diff
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|
991 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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0
diff
changeset
|
992 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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0
diff
changeset
|
993 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
|
994 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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995 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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0
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996 // 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
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997 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
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|
998 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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0
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|
999 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
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1000 // 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
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1001 // 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
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1002 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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1003 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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0
diff
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|
1004 } |
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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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|
1005 return true; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1006 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1007 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
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|
1008 return false; |
ff5961f4c095
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
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|
1010 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
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1011 // 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
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|
1012 // autobox object. Currently only handles Integer. |
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diff
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1013 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
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1014 if (atp != NULL && atp->field() != NULL) { |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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0
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1015 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
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1016 ciSymbol* klass = field->holder()->name(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
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1017 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
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1018 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
|
1019 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
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|
1020 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
|
1021 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1022 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1023 return false; |
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 |
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 // 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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1028 // 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
|
1029 // 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
|
1030 // 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
|
1031 // 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
|
1032 Node* LoadNode::eliminate_autobox(PhaseGVN* phase) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1033 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
|
1034 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
|
1035 AllocateNode* allocation = NULL; |
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
|
1036 int allocation_index = -1; |
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
|
1037 int load_index = -1; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1038 for (uint i = 1; i < base->req(); i++) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1039 allocation = AllocateNode::Ideal_allocation(base->in(i), phase); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1040 if (allocation != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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0
diff
changeset
|
1041 allocation_index = i; |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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changeset
|
1042 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
|
1043 break; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1044 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1045 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1046 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
|
1047 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
|
1048 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
|
1049 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1050 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
|
1051 // 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
|
1052 // 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
|
1053 // 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
|
1054 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
|
1055 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
|
1056 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1057 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
|
1058 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
|
1059 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
|
1060 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
|
1061 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
|
1062 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
|
1063 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
|
1064 in1->set_req(Memory, mem_phi->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1065 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1066 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
|
1067 Node* in2_addr = in2->in(Address)->clone(); |
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6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1068 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
|
1069 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
|
1070 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
|
1071 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
|
1072 in2->set_req(Address, in2_addr); |
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(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
|
1074 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1075 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
|
1076 in1 = phase->transform(in1); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
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parents:
0
diff
changeset
|
1077 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
|
1078 in2 = phase->transform(in2); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1079 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1080 PhiNode* result = PhiNode::make_blank(base->in(0), this); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1081 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
|
1082 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
|
1083 return result; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1084 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1085 } else if (base->is_Load()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1086 // 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
|
1087 // 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)
never
parents:
0
diff
changeset
|
1088 // 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
|
1089 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
|
1090 if (load_base != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1091 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
|
1092 intptr_t cache_offset; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1093 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
|
1094 Node* cache = NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1095 if (is_autobox_cache(atp)) { |
29
d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
kvn
parents:
17
diff
changeset
|
1096 shift = exact_log2(type2aelembytes(T_OBJECT)); |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1097 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)
never
parents:
0
diff
changeset
|
1098 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1099 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
|
1100 Node* elements[4]; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1101 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
|
1102 int cache_low; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
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1103 if (count > 0 && fetch_autobox_base(atp, cache_low)) { |
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1104 int offset = arrayOopDesc::base_offset_in_bytes(memory_type()) - (cache_low << shift); |
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1105 // Add up all the offsets making of the address of the load |
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1106 Node* result = elements[0]; |
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1107 for (int i = 1; i < count; i++) { |
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1108 result = phase->transform(new (phase->C, 3) AddXNode(result, elements[i])); |
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1109 } |
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1110 // Remove the constant offset from the address and then |
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1111 // remove the scaling of the offset to recover the original index. |
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1112 result = phase->transform(new (phase->C, 3) AddXNode(result, phase->MakeConX(-offset))); |
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1113 if (result->Opcode() == Op_LShiftX && result->in(2) == phase->intcon(shift)) { |
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1114 // Peel the shift off directly but wrap it in a dummy node |
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1115 // since Ideal can't return existing nodes |
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1116 result = new (phase->C, 3) RShiftXNode(result->in(1), phase->intcon(0)); |
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1117 } else { |
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1118 result = new (phase->C, 3) RShiftXNode(result, phase->intcon(shift)); |
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1119 } |
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1120 #ifdef _LP64 |
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1121 result = new (phase->C, 2) ConvL2INode(phase->transform(result)); |
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1122 #endif |
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1123 return result; |
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1124 } |
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1125 } |
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1126 } |
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1127 } |
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1128 return NULL; |
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1129 } |
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1130 |
163 | 1131 //------------------------------split_through_phi------------------------------ |
1132 // Split instance field load through Phi. | |
1133 Node *LoadNode::split_through_phi(PhaseGVN *phase) { | |
1134 Node* mem = in(MemNode::Memory); | |
1135 Node* address = in(MemNode::Address); | |
1136 const TypePtr *addr_t = phase->type(address)->isa_ptr(); | |
1137 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); | |
1138 | |
1139 assert(mem->is_Phi() && (t_oop != NULL) && | |
1140 t_oop->is_instance_field(), "invalide conditions"); | |
1141 | |
1142 Node *region = mem->in(0); | |
1143 if (region == NULL) { | |
1144 return NULL; // Wait stable graph | |
1145 } | |
1146 uint cnt = mem->req(); | |
1147 for( uint i = 1; i < cnt; i++ ) { | |
1148 Node *in = mem->in(i); | |
1149 if( in == NULL ) { | |
1150 return NULL; // Wait stable graph | |
1151 } | |
1152 } | |
1153 // Check for loop invariant. | |
1154 if (cnt == 3) { | |
1155 for( uint i = 1; i < cnt; i++ ) { | |
1156 Node *in = mem->in(i); | |
1157 Node* m = MemNode::optimize_memory_chain(in, addr_t, phase); | |
1158 if (m == mem) { | |
1159 set_req(MemNode::Memory, mem->in(cnt - i)); // Skip this phi. | |
1160 return this; | |
1161 } | |
1162 } | |
1163 } | |
1164 // Split through Phi (see original code in loopopts.cpp). | |
1165 assert(phase->C->have_alias_type(addr_t), "instance should have alias type"); | |
1166 | |
1167 // Do nothing here if Identity will find a value | |
1168 // (to avoid infinite chain of value phis generation). | |
1169 if ( !phase->eqv(this, this->Identity(phase)) ) | |
1170 return NULL; | |
1171 | |
1172 // Skip the split if the region dominates some control edge of the address. | |
1173 if (cnt == 3 && !MemNode::all_controls_dominate(address, region)) | |
1174 return NULL; | |
1175 | |
1176 const Type* this_type = this->bottom_type(); | |
1177 int this_index = phase->C->get_alias_index(addr_t); | |
1178 int this_offset = addr_t->offset(); | |
1179 int this_iid = addr_t->is_oopptr()->instance_id(); | |
1180 int wins = 0; | |
1181 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
1182 Node *phi = new (igvn->C, region->req()) PhiNode(region, this_type, NULL, this_iid, this_index, this_offset); | |
1183 for( uint i = 1; i < region->req(); i++ ) { | |
1184 Node *x; | |
1185 Node* the_clone = NULL; | |
1186 if( region->in(i) == phase->C->top() ) { | |
1187 x = phase->C->top(); // Dead path? Use a dead data op | |
1188 } else { | |
1189 x = this->clone(); // Else clone up the data op | |
1190 the_clone = x; // Remember for possible deletion. | |
1191 // Alter data node to use pre-phi inputs | |
1192 if( this->in(0) == region ) { | |
1193 x->set_req( 0, region->in(i) ); | |
1194 } else { | |
1195 x->set_req( 0, NULL ); | |
1196 } | |
1197 for( uint j = 1; j < this->req(); j++ ) { | |
1198 Node *in = this->in(j); | |
1199 if( in->is_Phi() && in->in(0) == region ) | |
1200 x->set_req( j, in->in(i) ); // Use pre-Phi input for the clone | |
1201 } | |
1202 } | |
1203 // Check for a 'win' on some paths | |
1204 const Type *t = x->Value(igvn); | |
1205 | |
1206 bool singleton = t->singleton(); | |
1207 | |
1208 // See comments in PhaseIdealLoop::split_thru_phi(). | |
1209 if( singleton && t == Type::TOP ) { | |
1210 singleton &= region->is_Loop() && (i != LoopNode::EntryControl); | |
1211 } | |
1212 | |
1213 if( singleton ) { | |
1214 wins++; | |
1215 x = igvn->makecon(t); | |
1216 } else { | |
1217 // We now call Identity to try to simplify the cloned node. | |
1218 // Note that some Identity methods call phase->type(this). | |
1219 // Make sure that the type array is big enough for | |
1220 // our new node, even though we may throw the node away. | |
1221 // (This tweaking with igvn only works because x is a new node.) | |
1222 igvn->set_type(x, t); | |
1223 Node *y = x->Identity(igvn); | |
1224 if( y != x ) { | |
1225 wins++; | |
1226 x = y; | |
1227 } else { | |
1228 y = igvn->hash_find(x); | |
1229 if( y ) { | |
1230 wins++; | |
1231 x = y; | |
1232 } else { | |
1233 // Else x is a new node we are keeping | |
1234 // We do not need register_new_node_with_optimizer | |
1235 // because set_type has already been called. | |
1236 igvn->_worklist.push(x); | |
1237 } | |
1238 } | |
1239 } | |
1240 if (x != the_clone && the_clone != NULL) | |
1241 igvn->remove_dead_node(the_clone); | |
1242 phi->set_req(i, x); | |
1243 } | |
1244 if( wins > 0 ) { | |
1245 // Record Phi | |
1246 igvn->register_new_node_with_optimizer(phi); | |
1247 return phi; | |
1248 } | |
1249 igvn->remove_dead_node(phi); | |
1250 return NULL; | |
1251 } | |
17
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1252 |
0 | 1253 //------------------------------Ideal------------------------------------------ |
1254 // If the load is from Field memory and the pointer is non-null, we can | |
1255 // zero out the control input. | |
1256 // If the offset is constant and the base is an object allocation, | |
1257 // try to hook me up to the exact initializing store. | |
1258 Node *LoadNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1259 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
1260 if (p) return (p == NodeSentinel) ? NULL : p; | |
1261 | |
1262 Node* ctrl = in(MemNode::Control); | |
1263 Node* address = in(MemNode::Address); | |
1264 | |
1265 // Skip up past a SafePoint control. Cannot do this for Stores because | |
1266 // pointer stores & cardmarks must stay on the same side of a SafePoint. | |
1267 if( ctrl != NULL && ctrl->Opcode() == Op_SafePoint && | |
1268 phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw ) { | |
1269 ctrl = ctrl->in(0); | |
1270 set_req(MemNode::Control,ctrl); | |
1271 } | |
1272 | |
1273 // Check for useless control edge in some common special cases | |
1274 if (in(MemNode::Control) != NULL) { | |
1275 intptr_t ignore = 0; | |
1276 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); | |
1277 if (base != NULL | |
1278 && phase->type(base)->higher_equal(TypePtr::NOTNULL) | |
119
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1279 && all_controls_dominate(base, phase->C->start())) { |
0 | 1280 // A method-invariant, non-null address (constant or 'this' argument). |
1281 set_req(MemNode::Control, NULL); | |
1282 } | |
1283 } | |
1284 | |
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1285 if (EliminateAutoBox && can_reshape && in(Address)->is_AddP()) { |
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1286 Node* base = in(Address)->in(AddPNode::Base); |
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1287 if (base != NULL) { |
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1288 Compile::AliasType* atp = phase->C->alias_type(adr_type()); |
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1289 if (is_autobox_object(atp)) { |
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1290 Node* result = eliminate_autobox(phase); |
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1291 if (result != NULL) return result; |
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1292 } |
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1293 } |
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1294 } |
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1295 |
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1296 Node* mem = in(MemNode::Memory); |
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1297 const TypePtr *addr_t = phase->type(address)->isa_ptr(); |
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1298 |
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1299 if (addr_t != NULL) { |
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1300 // try to optimize our memory input |
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1301 Node* opt_mem = MemNode::optimize_memory_chain(mem, addr_t, phase); |
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1302 if (opt_mem != mem) { |
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1303 set_req(MemNode::Memory, opt_mem); |
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1304 return this; |
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1305 } |
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1306 const TypeOopPtr *t_oop = addr_t->isa_oopptr(); |
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1307 if (can_reshape && opt_mem->is_Phi() && |
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1308 (t_oop != NULL) && t_oop->is_instance_field()) { |
163 | 1309 // Split instance field load through Phi. |
1310 Node* result = split_through_phi(phase); | |
1311 if (result != NULL) return result; | |
74
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1312 } |
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1313 } |
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1314 |
0 | 1315 // Check for prior store with a different base or offset; make Load |
1316 // independent. Skip through any number of them. Bail out if the stores | |
1317 // are in an endless dead cycle and report no progress. This is a key | |
1318 // transform for Reflection. However, if after skipping through the Stores | |
1319 // we can't then fold up against a prior store do NOT do the transform as | |
1320 // this amounts to using the 'Oracle' model of aliasing. It leaves the same | |
1321 // array memory alive twice: once for the hoisted Load and again after the | |
1322 // bypassed Store. This situation only works if EVERYBODY who does | |
1323 // anti-dependence work knows how to bypass. I.e. we need all | |
1324 // anti-dependence checks to ask the same Oracle. Right now, that Oracle is | |
1325 // the alias index stuff. So instead, peek through Stores and IFF we can | |
1326 // fold up, do so. | |
1327 Node* prev_mem = find_previous_store(phase); | |
1328 // Steps (a), (b): Walk past independent stores to find an exact match. | |
1329 if (prev_mem != NULL && prev_mem != in(MemNode::Memory)) { | |
1330 // (c) See if we can fold up on the spot, but don't fold up here. | |
1331 // Fold-up might require truncation (for LoadB/LoadS/LoadC) or | |
1332 // just return a prior value, which is done by Identity calls. | |
1333 if (can_see_stored_value(prev_mem, phase)) { | |
1334 // Make ready for step (d): | |
1335 set_req(MemNode::Memory, prev_mem); | |
1336 return this; | |
1337 } | |
1338 } | |
1339 | |
1340 return NULL; // No further progress | |
1341 } | |
1342 | |
1343 // Helper to recognize certain Klass fields which are invariant across | |
1344 // some group of array types (e.g., int[] or all T[] where T < Object). | |
1345 const Type* | |
1346 LoadNode::load_array_final_field(const TypeKlassPtr *tkls, | |
1347 ciKlass* klass) const { | |
1348 if (tkls->offset() == Klass::modifier_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1349 // The field is Klass::_modifier_flags. Return its (constant) value. | |
1350 // (Folds up the 2nd indirection in aClassConstant.getModifiers().) | |
1351 assert(this->Opcode() == Op_LoadI, "must load an int from _modifier_flags"); | |
1352 return TypeInt::make(klass->modifier_flags()); | |
1353 } | |
1354 if (tkls->offset() == Klass::access_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1355 // The field is Klass::_access_flags. Return its (constant) value. | |
1356 // (Folds up the 2nd indirection in Reflection.getClassAccessFlags(aClassConstant).) | |
1357 assert(this->Opcode() == Op_LoadI, "must load an int from _access_flags"); | |
1358 return TypeInt::make(klass->access_flags()); | |
1359 } | |
1360 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1361 // The field is Klass::_layout_helper. Return its constant value if known. | |
1362 assert(this->Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1363 return TypeInt::make(klass->layout_helper()); | |
1364 } | |
1365 | |
1366 // No match. | |
1367 return NULL; | |
1368 } | |
1369 | |
1370 //------------------------------Value----------------------------------------- | |
1371 const Type *LoadNode::Value( PhaseTransform *phase ) const { | |
1372 // Either input is TOP ==> the result is TOP | |
1373 Node* mem = in(MemNode::Memory); | |
1374 const Type *t1 = phase->type(mem); | |
1375 if (t1 == Type::TOP) return Type::TOP; | |
1376 Node* adr = in(MemNode::Address); | |
1377 const TypePtr* tp = phase->type(adr)->isa_ptr(); | |
1378 if (tp == NULL || tp->empty()) return Type::TOP; | |
1379 int off = tp->offset(); | |
1380 assert(off != Type::OffsetTop, "case covered by TypePtr::empty"); | |
1381 | |
1382 // Try to guess loaded type from pointer type | |
1383 if (tp->base() == Type::AryPtr) { | |
1384 const Type *t = tp->is_aryptr()->elem(); | |
1385 // Don't do this for integer types. There is only potential profit if | |
1386 // the element type t is lower than _type; that is, for int types, if _type is | |
1387 // more restrictive than t. This only happens here if one is short and the other | |
1388 // char (both 16 bits), and in those cases we've made an intentional decision | |
1389 // to use one kind of load over the other. See AndINode::Ideal and 4965907. | |
1390 // Also, do not try to narrow the type for a LoadKlass, regardless of offset. | |
1391 // | |
1392 // Yes, it is possible to encounter an expression like (LoadKlass p1:(AddP x x 8)) | |
1393 // where the _gvn.type of the AddP is wider than 8. This occurs when an earlier | |
1394 // copy p0 of (AddP x x 8) has been proven equal to p1, and the p0 has been | |
1395 // subsumed by p1. If p1 is on the worklist but has not yet been re-transformed, | |
1396 // it is possible that p1 will have a type like Foo*[int+]:NotNull*+any. | |
1397 // In fact, that could have been the original type of p1, and p1 could have | |
1398 // had an original form like p1:(AddP x x (LShiftL quux 3)), where the | |
1399 // expression (LShiftL quux 3) independently optimized to the constant 8. | |
1400 if ((t->isa_int() == NULL) && (t->isa_long() == NULL) | |
1401 && Opcode() != Op_LoadKlass) { | |
1402 // t might actually be lower than _type, if _type is a unique | |
1403 // concrete subclass of abstract class t. | |
1404 // Make sure the reference is not into the header, by comparing | |
1405 // the offset against the offset of the start of the array's data. | |
1406 // Different array types begin at slightly different offsets (12 vs. 16). | |
1407 // We choose T_BYTE as an example base type that is least restrictive | |
1408 // as to alignment, which will therefore produce the smallest | |
1409 // possible base offset. | |
1410 const int min_base_off = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
1411 if ((uint)off >= (uint)min_base_off) { // is the offset beyond the header? | |
1412 const Type* jt = t->join(_type); | |
1413 // In any case, do not allow the join, per se, to empty out the type. | |
1414 if (jt->empty() && !t->empty()) { | |
1415 // This can happen if a interface-typed array narrows to a class type. | |
1416 jt = _type; | |
1417 } | |
17
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1418 |
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1419 if (EliminateAutoBox) { |
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1420 // The pointers in the autobox arrays are always non-null |
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1421 Node* base = in(Address)->in(AddPNode::Base); |
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1422 if (base != NULL) { |
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1423 Compile::AliasType* atp = phase->C->alias_type(base->adr_type()); |
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1424 if (is_autobox_cache(atp)) { |
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1425 return jt->join(TypePtr::NOTNULL)->is_ptr(); |
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1426 } |
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1427 } |
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1428 } |
0 | 1429 return jt; |
1430 } | |
1431 } | |
1432 } else if (tp->base() == Type::InstPtr) { | |
1433 assert( off != Type::OffsetBot || | |
1434 // arrays can be cast to Objects | |
1435 tp->is_oopptr()->klass()->is_java_lang_Object() || | |
1436 // unsafe field access may not have a constant offset | |
1437 phase->C->has_unsafe_access(), | |
1438 "Field accesses must be precise" ); | |
1439 // For oop loads, we expect the _type to be precise | |
1440 } else if (tp->base() == Type::KlassPtr) { | |
1441 assert( off != Type::OffsetBot || | |
1442 // arrays can be cast to Objects | |
1443 tp->is_klassptr()->klass()->is_java_lang_Object() || | |
1444 // also allow array-loading from the primary supertype | |
1445 // array during subtype checks | |
1446 Opcode() == Op_LoadKlass, | |
1447 "Field accesses must be precise" ); | |
1448 // For klass/static loads, we expect the _type to be precise | |
1449 } | |
1450 | |
1451 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1452 if (tkls != NULL && !StressReflectiveCode) { | |
1453 ciKlass* klass = tkls->klass(); | |
1454 if (klass->is_loaded() && tkls->klass_is_exact()) { | |
1455 // We are loading a field from a Klass metaobject whose identity | |
1456 // is known at compile time (the type is "exact" or "precise"). | |
1457 // Check for fields we know are maintained as constants by the VM. | |
1458 if (tkls->offset() == Klass::super_check_offset_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1459 // The field is Klass::_super_check_offset. Return its (constant) value. | |
1460 // (Folds up type checking code.) | |
1461 assert(Opcode() == Op_LoadI, "must load an int from _super_check_offset"); | |
1462 return TypeInt::make(klass->super_check_offset()); | |
1463 } | |
1464 // Compute index into primary_supers array | |
1465 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
1466 // Check for overflowing; use unsigned compare to handle the negative case. | |
1467 if( depth < ciKlass::primary_super_limit() ) { | |
1468 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1469 // (Folds up type checking code.) | |
1470 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1471 ciKlass *ss = klass->super_of_depth(depth); | |
1472 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1473 } | |
1474 const Type* aift = load_array_final_field(tkls, klass); | |
1475 if (aift != NULL) return aift; | |
1476 if (tkls->offset() == in_bytes(arrayKlass::component_mirror_offset()) + (int)sizeof(oopDesc) | |
1477 && klass->is_array_klass()) { | |
1478 // The field is arrayKlass::_component_mirror. Return its (constant) value. | |
1479 // (Folds up aClassConstant.getComponentType, common in Arrays.copyOf.) | |
1480 assert(Opcode() == Op_LoadP, "must load an oop from _component_mirror"); | |
1481 return TypeInstPtr::make(klass->as_array_klass()->component_mirror()); | |
1482 } | |
1483 if (tkls->offset() == Klass::java_mirror_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1484 // The field is Klass::_java_mirror. Return its (constant) value. | |
1485 // (Folds up the 2nd indirection in anObjConstant.getClass().) | |
1486 assert(Opcode() == Op_LoadP, "must load an oop from _java_mirror"); | |
1487 return TypeInstPtr::make(klass->java_mirror()); | |
1488 } | |
1489 } | |
1490 | |
1491 // We can still check if we are loading from the primary_supers array at a | |
1492 // shallow enough depth. Even though the klass is not exact, entries less | |
1493 // than or equal to its super depth are correct. | |
1494 if (klass->is_loaded() ) { | |
1495 ciType *inner = klass->klass(); | |
1496 while( inner->is_obj_array_klass() ) | |
1497 inner = inner->as_obj_array_klass()->base_element_type(); | |
1498 if( inner->is_instance_klass() && | |
1499 !inner->as_instance_klass()->flags().is_interface() ) { | |
1500 // Compute index into primary_supers array | |
1501 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
1502 // Check for overflowing; use unsigned compare to handle the negative case. | |
1503 if( depth < ciKlass::primary_super_limit() && | |
1504 depth <= klass->super_depth() ) { // allow self-depth checks to handle self-check case | |
1505 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1506 // (Folds up type checking code.) | |
1507 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1508 ciKlass *ss = klass->super_of_depth(depth); | |
1509 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1510 } | |
1511 } | |
1512 } | |
1513 | |
1514 // If the type is enough to determine that the thing is not an array, | |
1515 // we can give the layout_helper a positive interval type. | |
1516 // This will help short-circuit some reflective code. | |
1517 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc) | |
1518 && !klass->is_array_klass() // not directly typed as an array | |
1519 && !klass->is_interface() // specifically not Serializable & Cloneable | |
1520 && !klass->is_java_lang_Object() // not the supertype of all T[] | |
1521 ) { | |
1522 // Note: When interfaces are reliable, we can narrow the interface | |
1523 // test to (klass != Serializable && klass != Cloneable). | |
1524 assert(Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1525 jint min_size = Klass::instance_layout_helper(oopDesc::header_size(), false); | |
1526 // The key property of this type is that it folds up tests | |
1527 // for array-ness, since it proves that the layout_helper is positive. | |
1528 // Thus, a generic value like the basic object layout helper works fine. | |
1529 return TypeInt::make(min_size, max_jint, Type::WidenMin); | |
1530 } | |
1531 } | |
1532 | |
1533 // If we are loading from a freshly-allocated object, produce a zero, | |
1534 // if the load is provably beyond the header of the object. | |
1535 // (Also allow a variable load from a fresh array to produce zero.) | |
1536 if (ReduceFieldZeroing) { | |
1537 Node* value = can_see_stored_value(mem,phase); | |
1538 if (value != NULL && value->is_Con()) | |
1539 return value->bottom_type(); | |
1540 } | |
1541 | |
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1542 const TypeOopPtr *tinst = tp->isa_oopptr(); |
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1543 if (tinst != NULL && tinst->is_instance_field()) { |
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1544 // If we have an instance type and our memory input is the |
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1545 // programs's initial memory state, there is no matching store, |
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1546 // so just return a zero of the appropriate type |
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1547 Node *mem = in(MemNode::Memory); |
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1548 if (mem->is_Parm() && mem->in(0)->is_Start()) { |
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1549 assert(mem->as_Parm()->_con == TypeFunc::Memory, "must be memory Parm"); |
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1550 return Type::get_zero_type(_type->basic_type()); |
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1551 } |
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1552 } |
0 | 1553 return _type; |
1554 } | |
1555 | |
1556 //------------------------------match_edge------------------------------------- | |
1557 // Do we Match on this edge index or not? Match only the address. | |
1558 uint LoadNode::match_edge(uint idx) const { | |
1559 return idx == MemNode::Address; | |
1560 } | |
1561 | |
1562 //--------------------------LoadBNode::Ideal-------------------------------------- | |
1563 // | |
1564 // If the previous store is to the same address as this load, | |
1565 // and the value stored was larger than a byte, replace this load | |
1566 // with the value stored truncated to a byte. If no truncation is | |
1567 // needed, the replacement is done in LoadNode::Identity(). | |
1568 // | |
1569 Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1570 Node* mem = in(MemNode::Memory); | |
1571 Node* value = can_see_stored_value(mem,phase); | |
1572 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1573 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(24)) ); | |
1574 return new (phase->C, 3) RShiftINode(result, phase->intcon(24)); | |
1575 } | |
1576 // Identity call will handle the case where truncation is not needed. | |
1577 return LoadNode::Ideal(phase, can_reshape); | |
1578 } | |
1579 | |
1580 //--------------------------LoadCNode::Ideal-------------------------------------- | |
1581 // | |
1582 // If the previous store is to the same address as this load, | |
1583 // and the value stored was larger than a char, replace this load | |
1584 // with the value stored truncated to a char. If no truncation is | |
1585 // needed, the replacement is done in LoadNode::Identity(). | |
1586 // | |
1587 Node *LoadCNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1588 Node* mem = in(MemNode::Memory); | |
1589 Node* value = can_see_stored_value(mem,phase); | |
1590 if( value && !phase->type(value)->higher_equal( _type ) ) | |
1591 return new (phase->C, 3) AndINode(value,phase->intcon(0xFFFF)); | |
1592 // Identity call will handle the case where truncation is not needed. | |
1593 return LoadNode::Ideal(phase, can_reshape); | |
1594 } | |
1595 | |
1596 //--------------------------LoadSNode::Ideal-------------------------------------- | |
1597 // | |
1598 // If the previous store is to the same address as this load, | |
1599 // and the value stored was larger than a short, replace this load | |
1600 // with the value stored truncated to a short. If no truncation is | |
1601 // needed, the replacement is done in LoadNode::Identity(). | |
1602 // | |
1603 Node *LoadSNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1604 Node* mem = in(MemNode::Memory); | |
1605 Node* value = can_see_stored_value(mem,phase); | |
1606 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1607 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(16)) ); | |
1608 return new (phase->C, 3) RShiftINode(result, phase->intcon(16)); | |
1609 } | |
1610 // Identity call will handle the case where truncation is not needed. | |
1611 return LoadNode::Ideal(phase, can_reshape); | |
1612 } | |
1613 | |
1614 //============================================================================= | |
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1615 //----------------------------LoadKlassNode::make------------------------------ |
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1616 // Polymorphic factory method: |
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1617 Node *LoadKlassNode::make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, const TypeKlassPtr *tk ) { |
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1618 Compile* C = gvn.C; |
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1619 Node *ctl = NULL; |
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1620 // sanity check the alias category against the created node type |
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1621 const TypeOopPtr *adr_type = adr->bottom_type()->isa_oopptr(); |
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1622 assert(adr_type != NULL, "expecting TypeOopPtr"); |
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1623 #ifdef _LP64 |
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1624 if (adr_type->is_ptr_to_narrowoop()) { |
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1625 const TypeNarrowOop* narrowtype = tk->is_oopptr()->make_narrowoop(); |
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1626 Node* load_klass = gvn.transform(new (C, 3) LoadNKlassNode(ctl, mem, adr, at, narrowtype)); |
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1627 return DecodeNNode::decode(&gvn, load_klass); |
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1628 } |
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1629 #endif |
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1630 assert(!adr_type->is_ptr_to_narrowoop(), "should have got back a narrow oop"); |
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1631 return new (C, 3) LoadKlassNode(ctl, mem, adr, at, tk); |
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1632 } |
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1633 |
0 | 1634 //------------------------------Value------------------------------------------ |
1635 const Type *LoadKlassNode::Value( PhaseTransform *phase ) const { | |
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1636 return klass_value_common(phase); |
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1637 } |
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1638 |
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1639 const Type *LoadNode::klass_value_common( PhaseTransform *phase ) const { |
0 | 1640 // Either input is TOP ==> the result is TOP |
1641 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1642 if (t1 == Type::TOP) return Type::TOP; | |
1643 Node *adr = in(MemNode::Address); | |
1644 const Type *t2 = phase->type( adr ); | |
1645 if (t2 == Type::TOP) return Type::TOP; | |
1646 const TypePtr *tp = t2->is_ptr(); | |
1647 if (TypePtr::above_centerline(tp->ptr()) || | |
1648 tp->ptr() == TypePtr::Null) return Type::TOP; | |
1649 | |
1650 // Return a more precise klass, if possible | |
1651 const TypeInstPtr *tinst = tp->isa_instptr(); | |
1652 if (tinst != NULL) { | |
1653 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
1654 int offset = tinst->offset(); | |
1655 if (ik == phase->C->env()->Class_klass() | |
1656 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
1657 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
1658 // We are loading a special hidden field from a Class mirror object, | |
1659 // the field which points to the VM's Klass metaobject. | |
1660 ciType* t = tinst->java_mirror_type(); | |
1661 // java_mirror_type returns non-null for compile-time Class constants. | |
1662 if (t != NULL) { | |
1663 // constant oop => constant klass | |
1664 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
1665 return TypeKlassPtr::make(ciArrayKlass::make(t)); | |
1666 } | |
1667 if (!t->is_klass()) { | |
1668 // a primitive Class (e.g., int.class) has NULL for a klass field | |
1669 return TypePtr::NULL_PTR; | |
1670 } | |
1671 // (Folds up the 1st indirection in aClassConstant.getModifiers().) | |
1672 return TypeKlassPtr::make(t->as_klass()); | |
1673 } | |
1674 // non-constant mirror, so we can't tell what's going on | |
1675 } | |
1676 if( !ik->is_loaded() ) | |
1677 return _type; // Bail out if not loaded | |
1678 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1679 if (tinst->klass_is_exact()) { | |
1680 return TypeKlassPtr::make(ik); | |
1681 } | |
1682 // See if we can become precise: no subklasses and no interface | |
1683 // (Note: We need to support verified interfaces.) | |
1684 if (!ik->is_interface() && !ik->has_subklass()) { | |
1685 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1686 // Add a dependence; if any subclass added we need to recompile | |
1687 if (!ik->is_final()) { | |
1688 // %%% should use stronger assert_unique_concrete_subtype instead | |
1689 phase->C->dependencies()->assert_leaf_type(ik); | |
1690 } | |
1691 // Return precise klass | |
1692 return TypeKlassPtr::make(ik); | |
1693 } | |
1694 | |
1695 // Return root of possible klass | |
1696 return TypeKlassPtr::make(TypePtr::NotNull, ik, 0/*offset*/); | |
1697 } | |
1698 } | |
1699 | |
1700 // Check for loading klass from an array | |
1701 const TypeAryPtr *tary = tp->isa_aryptr(); | |
1702 if( tary != NULL ) { | |
1703 ciKlass *tary_klass = tary->klass(); | |
1704 if (tary_klass != NULL // can be NULL when at BOTTOM or TOP | |
1705 && tary->offset() == oopDesc::klass_offset_in_bytes()) { | |
1706 if (tary->klass_is_exact()) { | |
1707 return TypeKlassPtr::make(tary_klass); | |
1708 } | |
1709 ciArrayKlass *ak = tary->klass()->as_array_klass(); | |
1710 // If the klass is an object array, we defer the question to the | |
1711 // array component klass. | |
1712 if( ak->is_obj_array_klass() ) { | |
1713 assert( ak->is_loaded(), "" ); | |
1714 ciKlass *base_k = ak->as_obj_array_klass()->base_element_klass(); | |
1715 if( base_k->is_loaded() && base_k->is_instance_klass() ) { | |
1716 ciInstanceKlass* ik = base_k->as_instance_klass(); | |
1717 // See if we can become precise: no subklasses and no interface | |
1718 if (!ik->is_interface() && !ik->has_subklass()) { | |
1719 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1720 // Add a dependence; if any subclass added we need to recompile | |
1721 if (!ik->is_final()) { | |
1722 phase->C->dependencies()->assert_leaf_type(ik); | |
1723 } | |
1724 // Return precise array klass | |
1725 return TypeKlassPtr::make(ak); | |
1726 } | |
1727 } | |
1728 return TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
1729 } else { // Found a type-array? | |
1730 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1731 assert( ak->is_type_array_klass(), "" ); | |
1732 return TypeKlassPtr::make(ak); // These are always precise | |
1733 } | |
1734 } | |
1735 } | |
1736 | |
1737 // Check for loading klass from an array klass | |
1738 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1739 if (tkls != NULL && !StressReflectiveCode) { | |
1740 ciKlass* klass = tkls->klass(); | |
1741 if( !klass->is_loaded() ) | |
1742 return _type; // Bail out if not loaded | |
1743 if( klass->is_obj_array_klass() && | |
1744 (uint)tkls->offset() == objArrayKlass::element_klass_offset_in_bytes() + sizeof(oopDesc)) { | |
1745 ciKlass* elem = klass->as_obj_array_klass()->element_klass(); | |
1746 // // Always returning precise element type is incorrect, | |
1747 // // e.g., element type could be object and array may contain strings | |
1748 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0); | |
1749 | |
1750 // The array's TypeKlassPtr was declared 'precise' or 'not precise' | |
1751 // according to the element type's subclassing. | |
1752 return TypeKlassPtr::make(tkls->ptr(), elem, 0/*offset*/); | |
1753 } | |
1754 if( klass->is_instance_klass() && tkls->klass_is_exact() && | |
1755 (uint)tkls->offset() == Klass::super_offset_in_bytes() + sizeof(oopDesc)) { | |
1756 ciKlass* sup = klass->as_instance_klass()->super(); | |
1757 // The field is Klass::_super. Return its (constant) value. | |
1758 // (Folds up the 2nd indirection in aClassConstant.getSuperClass().) | |
1759 return sup ? TypeKlassPtr::make(sup) : TypePtr::NULL_PTR; | |
1760 } | |
1761 } | |
1762 | |
1763 // Bailout case | |
1764 return LoadNode::Value(phase); | |
1765 } | |
1766 | |
1767 //------------------------------Identity--------------------------------------- | |
1768 // To clean up reflective code, simplify k.java_mirror.as_klass to plain k. | |
1769 // Also feed through the klass in Allocate(...klass...)._klass. | |
1770 Node* LoadKlassNode::Identity( PhaseTransform *phase ) { | |
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1771 return klass_identity_common(phase); |
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1772 } |
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1773 |
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1774 Node* LoadNode::klass_identity_common(PhaseTransform *phase ) { |
0 | 1775 Node* x = LoadNode::Identity(phase); |
1776 if (x != this) return x; | |
1777 | |
1778 // Take apart the address into an oop and and offset. | |
1779 // Return 'this' if we cannot. | |
1780 Node* adr = in(MemNode::Address); | |
1781 intptr_t offset = 0; | |
1782 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
1783 if (base == NULL) return this; | |
1784 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr(); | |
1785 if (toop == NULL) return this; | |
1786 | |
1787 // We can fetch the klass directly through an AllocateNode. | |
1788 // This works even if the klass is not constant (clone or newArray). | |
1789 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1790 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase); | |
1791 if (allocated_klass != NULL) { | |
1792 return allocated_klass; | |
1793 } | |
1794 } | |
1795 | |
1796 // Simplify k.java_mirror.as_klass to plain k, where k is a klassOop. | |
1797 // Simplify ak.component_mirror.array_klass to plain ak, ak an arrayKlass. | |
1798 // See inline_native_Class_query for occurrences of these patterns. | |
1799 // Java Example: x.getClass().isAssignableFrom(y) | |
1800 // Java Example: Array.newInstance(x.getClass().getComponentType(), n) | |
1801 // | |
1802 // This improves reflective code, often making the Class | |
1803 // mirror go completely dead. (Current exception: Class | |
1804 // mirrors may appear in debug info, but we could clean them out by | |
1805 // introducing a new debug info operator for klassOop.java_mirror). | |
1806 if (toop->isa_instptr() && toop->klass() == phase->C->env()->Class_klass() | |
1807 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
1808 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
1809 // We are loading a special hidden field from a Class mirror, | |
1810 // the field which points to its Klass or arrayKlass metaobject. | |
1811 if (base->is_Load()) { | |
1812 Node* adr2 = base->in(MemNode::Address); | |
1813 const TypeKlassPtr* tkls = phase->type(adr2)->isa_klassptr(); | |
1814 if (tkls != NULL && !tkls->empty() | |
1815 && (tkls->klass()->is_instance_klass() || | |
1816 tkls->klass()->is_array_klass()) | |
1817 && adr2->is_AddP() | |
1818 ) { | |
1819 int mirror_field = Klass::java_mirror_offset_in_bytes(); | |
1820 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
1821 mirror_field = in_bytes(arrayKlass::component_mirror_offset()); | |
1822 } | |
1823 if (tkls->offset() == mirror_field + (int)sizeof(oopDesc)) { | |
1824 return adr2->in(AddPNode::Base); | |
1825 } | |
1826 } | |
1827 } | |
1828 } | |
1829 | |
1830 return this; | |
1831 } | |
1832 | |
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1833 |
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1834 //------------------------------Value------------------------------------------ |
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1835 const Type *LoadNKlassNode::Value( PhaseTransform *phase ) const { |
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1836 const Type *t = klass_value_common(phase); |
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1837 |
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1838 if (t == TypePtr::NULL_PTR) { |
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1839 return TypeNarrowOop::NULL_PTR; |
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1840 } |
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1841 if (t != Type::TOP && !t->isa_narrowoop()) { |
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1842 assert(t->is_oopptr(), "sanity"); |
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1843 t = t->is_oopptr()->make_narrowoop(); |
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1844 } |
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1845 return t; |
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1846 } |
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1847 |
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1848 //------------------------------Identity--------------------------------------- |
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1849 // To clean up reflective code, simplify k.java_mirror.as_klass to narrow k. |
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1850 // Also feed through the klass in Allocate(...klass...)._klass. |
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1851 Node* LoadNKlassNode::Identity( PhaseTransform *phase ) { |
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1852 Node *x = klass_identity_common(phase); |
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1853 |
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1854 const Type *t = phase->type( x ); |
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1855 if( t == Type::TOP ) return x; |
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1856 if( t->isa_narrowoop()) return x; |
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1857 |
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1858 return EncodePNode::encode(phase, x); |
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1859 } |
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1860 |
0 | 1861 //------------------------------Value----------------------------------------- |
1862 const Type *LoadRangeNode::Value( PhaseTransform *phase ) const { | |
1863 // Either input is TOP ==> the result is TOP | |
1864 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1865 if( t1 == Type::TOP ) return Type::TOP; | |
1866 Node *adr = in(MemNode::Address); | |
1867 const Type *t2 = phase->type( adr ); | |
1868 if( t2 == Type::TOP ) return Type::TOP; | |
1869 const TypePtr *tp = t2->is_ptr(); | |
1870 if (TypePtr::above_centerline(tp->ptr())) return Type::TOP; | |
1871 const TypeAryPtr *tap = tp->isa_aryptr(); | |
1872 if( !tap ) return _type; | |
1873 return tap->size(); | |
1874 } | |
1875 | |
1876 //------------------------------Identity--------------------------------------- | |
1877 // Feed through the length in AllocateArray(...length...)._length. | |
1878 Node* LoadRangeNode::Identity( PhaseTransform *phase ) { | |
1879 Node* x = LoadINode::Identity(phase); | |
1880 if (x != this) return x; | |
1881 | |
1882 // Take apart the address into an oop and and offset. | |
1883 // Return 'this' if we cannot. | |
1884 Node* adr = in(MemNode::Address); | |
1885 intptr_t offset = 0; | |
1886 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
1887 if (base == NULL) return this; | |
1888 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); | |
1889 if (tary == NULL) return this; | |
1890 | |
1891 // We can fetch the length directly through an AllocateArrayNode. | |
1892 // This works even if the length is not constant (clone or newArray). | |
1893 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
1894 Node* allocated_length = AllocateArrayNode::Ideal_length(base, phase); | |
1895 if (allocated_length != NULL) { | |
1896 return allocated_length; | |
1897 } | |
1898 } | |
1899 | |
1900 return this; | |
1901 | |
1902 } | |
1903 //============================================================================= | |
1904 //---------------------------StoreNode::make----------------------------------- | |
1905 // Polymorphic factory method: | |
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1906 StoreNode* StoreNode::make( PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, BasicType bt ) { |
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1907 Compile* C = gvn.C; |
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1908 |
0 | 1909 switch (bt) { |
1910 case T_BOOLEAN: | |
1911 case T_BYTE: return new (C, 4) StoreBNode(ctl, mem, adr, adr_type, val); | |
1912 case T_INT: return new (C, 4) StoreINode(ctl, mem, adr, adr_type, val); | |
1913 case T_CHAR: | |
1914 case T_SHORT: return new (C, 4) StoreCNode(ctl, mem, adr, adr_type, val); | |
1915 case T_LONG: return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val); | |
1916 case T_FLOAT: return new (C, 4) StoreFNode(ctl, mem, adr, adr_type, val); | |
1917 case T_DOUBLE: return new (C, 4) StoreDNode(ctl, mem, adr, adr_type, val); | |
1918 case T_ADDRESS: | |
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1919 case T_OBJECT: |
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1920 #ifdef _LP64 |
163 | 1921 if (adr->bottom_type()->is_ptr_to_narrowoop() || |
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1922 (UseCompressedOops && val->bottom_type()->isa_klassptr() && |
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1923 adr->bottom_type()->isa_rawptr())) { |
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1924 const TypePtr* type = val->bottom_type()->is_ptr(); |
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1925 Node* cp = EncodePNode::encode(&gvn, val); |
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1926 return new (C, 4) StoreNNode(ctl, mem, adr, adr_type, cp); |
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1927 } else |
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1928 #endif |
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1929 { |
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1930 return new (C, 4) StorePNode(ctl, mem, adr, adr_type, val); |
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1931 } |
0 | 1932 } |
1933 ShouldNotReachHere(); | |
1934 return (StoreNode*)NULL; | |
1935 } | |
1936 | |
1937 StoreLNode* StoreLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val) { | |
1938 bool require_atomic = true; | |
1939 return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val, require_atomic); | |
1940 } | |
1941 | |
1942 | |
1943 //--------------------------bottom_type---------------------------------------- | |
1944 const Type *StoreNode::bottom_type() const { | |
1945 return Type::MEMORY; | |
1946 } | |
1947 | |
1948 //------------------------------hash------------------------------------------- | |
1949 uint StoreNode::hash() const { | |
1950 // unroll addition of interesting fields | |
1951 //return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address) + (uintptr_t)in(ValueIn); | |
1952 | |
1953 // Since they are not commoned, do not hash them: | |
1954 return NO_HASH; | |
1955 } | |
1956 | |
1957 //------------------------------Ideal------------------------------------------ | |
1958 // Change back-to-back Store(, p, x) -> Store(m, p, y) to Store(m, p, x). | |
1959 // When a store immediately follows a relevant allocation/initialization, | |
1960 // try to capture it into the initialization, or hoist it above. | |
1961 Node *StoreNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1962 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
1963 if (p) return (p == NodeSentinel) ? NULL : p; | |
1964 | |
1965 Node* mem = in(MemNode::Memory); | |
1966 Node* address = in(MemNode::Address); | |
1967 | |
1968 // Back-to-back stores to same address? Fold em up. | |
1969 // Generally unsafe if I have intervening uses... | |
1970 if (mem->is_Store() && phase->eqv_uncast(mem->in(MemNode::Address), address)) { | |
1971 // Looking at a dead closed cycle of memory? | |
1972 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal"); | |
1973 | |
1974 assert(Opcode() == mem->Opcode() || | |
1975 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw, | |
1976 "no mismatched stores, except on raw memory"); | |
1977 | |
1978 if (mem->outcnt() == 1 && // check for intervening uses | |
1979 mem->as_Store()->memory_size() <= this->memory_size()) { | |
1980 // If anybody other than 'this' uses 'mem', we cannot fold 'mem' away. | |
1981 // For example, 'mem' might be the final state at a conditional return. | |
1982 // Or, 'mem' might be used by some node which is live at the same time | |
1983 // 'this' is live, which might be unschedulable. So, require exactly | |
1984 // ONE user, the 'this' store, until such time as we clone 'mem' for | |
1985 // each of 'mem's uses (thus making the exactly-1-user-rule hold true). | |
1986 if (can_reshape) { // (%%% is this an anachronism?) | |
1987 set_req_X(MemNode::Memory, mem->in(MemNode::Memory), | |
1988 phase->is_IterGVN()); | |
1989 } else { | |
1990 // It's OK to do this in the parser, since DU info is always accurate, | |
1991 // and the parser always refers to nodes via SafePointNode maps. | |
1992 set_req(MemNode::Memory, mem->in(MemNode::Memory)); | |
1993 } | |
1994 return this; | |
1995 } | |
1996 } | |
1997 | |
1998 // Capture an unaliased, unconditional, simple store into an initializer. | |
1999 // Or, if it is independent of the allocation, hoist it above the allocation. | |
2000 if (ReduceFieldZeroing && /*can_reshape &&*/ | |
2001 mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
2002 InitializeNode* init = mem->in(0)->as_Initialize(); | |
2003 intptr_t offset = init->can_capture_store(this, phase); | |
2004 if (offset > 0) { | |
2005 Node* moved = init->capture_store(this, offset, phase); | |
2006 // If the InitializeNode captured me, it made a raw copy of me, | |
2007 // and I need to disappear. | |
2008 if (moved != NULL) { | |
2009 // %%% hack to ensure that Ideal returns a new node: | |
2010 mem = MergeMemNode::make(phase->C, mem); | |
2011 return mem; // fold me away | |
2012 } | |
2013 } | |
2014 } | |
2015 | |
2016 return NULL; // No further progress | |
2017 } | |
2018 | |
2019 //------------------------------Value----------------------------------------- | |
2020 const Type *StoreNode::Value( PhaseTransform *phase ) const { | |
2021 // Either input is TOP ==> the result is TOP | |
2022 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
2023 if( t1 == Type::TOP ) return Type::TOP; | |
2024 const Type *t2 = phase->type( in(MemNode::Address) ); | |
2025 if( t2 == Type::TOP ) return Type::TOP; | |
2026 const Type *t3 = phase->type( in(MemNode::ValueIn) ); | |
2027 if( t3 == Type::TOP ) return Type::TOP; | |
2028 return Type::MEMORY; | |
2029 } | |
2030 | |
2031 //------------------------------Identity--------------------------------------- | |
2032 // Remove redundant stores: | |
2033 // Store(m, p, Load(m, p)) changes to m. | |
2034 // Store(, p, x) -> Store(m, p, x) changes to Store(m, p, x). | |
2035 Node *StoreNode::Identity( PhaseTransform *phase ) { | |
2036 Node* mem = in(MemNode::Memory); | |
2037 Node* adr = in(MemNode::Address); | |
2038 Node* val = in(MemNode::ValueIn); | |
2039 | |
2040 // Load then Store? Then the Store is useless | |
2041 if (val->is_Load() && | |
2042 phase->eqv_uncast( val->in(MemNode::Address), adr ) && | |
2043 phase->eqv_uncast( val->in(MemNode::Memory ), mem ) && | |
2044 val->as_Load()->store_Opcode() == Opcode()) { | |
2045 return mem; | |
2046 } | |
2047 | |
2048 // Two stores in a row of the same value? | |
2049 if (mem->is_Store() && | |
2050 phase->eqv_uncast( mem->in(MemNode::Address), adr ) && | |
2051 phase->eqv_uncast( mem->in(MemNode::ValueIn), val ) && | |
2052 mem->Opcode() == Opcode()) { | |
2053 return mem; | |
2054 } | |
2055 | |
2056 // Store of zero anywhere into a freshly-allocated object? | |
2057 // Then the store is useless. | |
2058 // (It must already have been captured by the InitializeNode.) | |
2059 if (ReduceFieldZeroing && phase->type(val)->is_zero_type()) { | |
2060 // a newly allocated object is already all-zeroes everywhere | |
2061 if (mem->is_Proj() && mem->in(0)->is_Allocate()) { | |
2062 return mem; | |
2063 } | |
2064 | |
2065 // the store may also apply to zero-bits in an earlier object | |
2066 Node* prev_mem = find_previous_store(phase); | |
2067 // Steps (a), (b): Walk past independent stores to find an exact match. | |
2068 if (prev_mem != NULL) { | |
2069 Node* prev_val = can_see_stored_value(prev_mem, phase); | |
2070 if (prev_val != NULL && phase->eqv(prev_val, val)) { | |
2071 // prev_val and val might differ by a cast; it would be good | |
2072 // to keep the more informative of the two. | |
2073 return mem; | |
2074 } | |
2075 } | |
2076 } | |
2077 | |
2078 return this; | |
2079 } | |
2080 | |
2081 //------------------------------match_edge------------------------------------- | |
2082 // Do we Match on this edge index or not? Match only memory & value | |
2083 uint StoreNode::match_edge(uint idx) const { | |
2084 return idx == MemNode::Address || idx == MemNode::ValueIn; | |
2085 } | |
2086 | |
2087 //------------------------------cmp-------------------------------------------- | |
2088 // Do not common stores up together. They generally have to be split | |
2089 // back up anyways, so do not bother. | |
2090 uint StoreNode::cmp( const Node &n ) const { | |
2091 return (&n == this); // Always fail except on self | |
2092 } | |
2093 | |
2094 //------------------------------Ideal_masked_input----------------------------- | |
2095 // Check for a useless mask before a partial-word store | |
2096 // (StoreB ... (AndI valIn conIa) ) | |
2097 // If (conIa & mask == mask) this simplifies to | |
2098 // (StoreB ... (valIn) ) | |
2099 Node *StoreNode::Ideal_masked_input(PhaseGVN *phase, uint mask) { | |
2100 Node *val = in(MemNode::ValueIn); | |
2101 if( val->Opcode() == Op_AndI ) { | |
2102 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2103 if( t && t->is_con() && (t->get_con() & mask) == mask ) { | |
2104 set_req(MemNode::ValueIn, val->in(1)); | |
2105 return this; | |
2106 } | |
2107 } | |
2108 return NULL; | |
2109 } | |
2110 | |
2111 | |
2112 //------------------------------Ideal_sign_extended_input---------------------- | |
2113 // Check for useless sign-extension before a partial-word store | |
2114 // (StoreB ... (RShiftI _ (LShiftI _ valIn conIL ) conIR) ) | |
2115 // If (conIL == conIR && conIR <= num_bits) this simplifies to | |
2116 // (StoreB ... (valIn) ) | |
2117 Node *StoreNode::Ideal_sign_extended_input(PhaseGVN *phase, int num_bits) { | |
2118 Node *val = in(MemNode::ValueIn); | |
2119 if( val->Opcode() == Op_RShiftI ) { | |
2120 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
2121 if( t && t->is_con() && (t->get_con() <= num_bits) ) { | |
2122 Node *shl = val->in(1); | |
2123 if( shl->Opcode() == Op_LShiftI ) { | |
2124 const TypeInt *t2 = phase->type( shl->in(2) )->isa_int(); | |
2125 if( t2 && t2->is_con() && (t2->get_con() == t->get_con()) ) { | |
2126 set_req(MemNode::ValueIn, shl->in(1)); | |
2127 return this; | |
2128 } | |
2129 } | |
2130 } | |
2131 } | |
2132 return NULL; | |
2133 } | |
2134 | |
2135 //------------------------------value_never_loaded----------------------------------- | |
2136 // Determine whether there are any possible loads of the value stored. | |
2137 // For simplicity, we actually check if there are any loads from the | |
2138 // address stored to, not just for loads of the value stored by this node. | |
2139 // | |
2140 bool StoreNode::value_never_loaded( PhaseTransform *phase) const { | |
2141 Node *adr = in(Address); | |
2142 const TypeOopPtr *adr_oop = phase->type(adr)->isa_oopptr(); | |
2143 if (adr_oop == NULL) | |
2144 return false; | |
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2145 if (!adr_oop->is_instance_field()) |
0 | 2146 return false; // if not a distinct instance, there may be aliases of the address |
2147 for (DUIterator_Fast imax, i = adr->fast_outs(imax); i < imax; i++) { | |
2148 Node *use = adr->fast_out(i); | |
2149 int opc = use->Opcode(); | |
2150 if (use->is_Load() || use->is_LoadStore()) { | |
2151 return false; | |
2152 } | |
2153 } | |
2154 return true; | |
2155 } | |
2156 | |
2157 //============================================================================= | |
2158 //------------------------------Ideal------------------------------------------ | |
2159 // If the store is from an AND mask that leaves the low bits untouched, then | |
2160 // we can skip the AND operation. If the store is from a sign-extension | |
2161 // (a left shift, then right shift) we can skip both. | |
2162 Node *StoreBNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2163 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFF); | |
2164 if( progress != NULL ) return progress; | |
2165 | |
2166 progress = StoreNode::Ideal_sign_extended_input(phase, 24); | |
2167 if( progress != NULL ) return progress; | |
2168 | |
2169 // Finally check the default case | |
2170 return StoreNode::Ideal(phase, can_reshape); | |
2171 } | |
2172 | |
2173 //============================================================================= | |
2174 //------------------------------Ideal------------------------------------------ | |
2175 // If the store is from an AND mask that leaves the low bits untouched, then | |
2176 // we can skip the AND operation | |
2177 Node *StoreCNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2178 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFFFF); | |
2179 if( progress != NULL ) return progress; | |
2180 | |
2181 progress = StoreNode::Ideal_sign_extended_input(phase, 16); | |
2182 if( progress != NULL ) return progress; | |
2183 | |
2184 // Finally check the default case | |
2185 return StoreNode::Ideal(phase, can_reshape); | |
2186 } | |
2187 | |
2188 //============================================================================= | |
2189 //------------------------------Identity--------------------------------------- | |
2190 Node *StoreCMNode::Identity( PhaseTransform *phase ) { | |
2191 // No need to card mark when storing a null ptr | |
2192 Node* my_store = in(MemNode::OopStore); | |
2193 if (my_store->is_Store()) { | |
2194 const Type *t1 = phase->type( my_store->in(MemNode::ValueIn) ); | |
2195 if( t1 == TypePtr::NULL_PTR ) { | |
2196 return in(MemNode::Memory); | |
2197 } | |
2198 } | |
2199 return this; | |
2200 } | |
2201 | |
2202 //------------------------------Value----------------------------------------- | |
2203 const Type *StoreCMNode::Value( PhaseTransform *phase ) const { | |
43 | 2204 // Either input is TOP ==> the result is TOP |
2205 const Type *t = phase->type( in(MemNode::Memory) ); | |
2206 if( t == Type::TOP ) return Type::TOP; | |
2207 t = phase->type( in(MemNode::Address) ); | |
2208 if( t == Type::TOP ) return Type::TOP; | |
2209 t = phase->type( in(MemNode::ValueIn) ); | |
2210 if( t == Type::TOP ) return Type::TOP; | |
0 | 2211 // If extra input is TOP ==> the result is TOP |
43 | 2212 t = phase->type( in(MemNode::OopStore) ); |
2213 if( t == Type::TOP ) return Type::TOP; | |
0 | 2214 |
2215 return StoreNode::Value( phase ); | |
2216 } | |
2217 | |
2218 | |
2219 //============================================================================= | |
2220 //----------------------------------SCMemProjNode------------------------------ | |
2221 const Type * SCMemProjNode::Value( PhaseTransform *phase ) const | |
2222 { | |
2223 return bottom_type(); | |
2224 } | |
2225 | |
2226 //============================================================================= | |
2227 LoadStoreNode::LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex ) : Node(5) { | |
2228 init_req(MemNode::Control, c ); | |
2229 init_req(MemNode::Memory , mem); | |
2230 init_req(MemNode::Address, adr); | |
2231 init_req(MemNode::ValueIn, val); | |
2232 init_req( ExpectedIn, ex ); | |
2233 init_class_id(Class_LoadStore); | |
2234 | |
2235 } | |
2236 | |
2237 //============================================================================= | |
2238 //-------------------------------adr_type-------------------------------------- | |
2239 // Do we Match on this edge index or not? Do not match memory | |
2240 const TypePtr* ClearArrayNode::adr_type() const { | |
2241 Node *adr = in(3); | |
2242 return MemNode::calculate_adr_type(adr->bottom_type()); | |
2243 } | |
2244 | |
2245 //------------------------------match_edge------------------------------------- | |
2246 // Do we Match on this edge index or not? Do not match memory | |
2247 uint ClearArrayNode::match_edge(uint idx) const { | |
2248 return idx > 1; | |
2249 } | |
2250 | |
2251 //------------------------------Identity--------------------------------------- | |
2252 // Clearing a zero length array does nothing | |
2253 Node *ClearArrayNode::Identity( PhaseTransform *phase ) { | |
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2254 return phase->type(in(2))->higher_equal(TypeX::ZERO) ? in(1) : this; |
0 | 2255 } |
2256 | |
2257 //------------------------------Idealize--------------------------------------- | |
2258 // Clearing a short array is faster with stores | |
2259 Node *ClearArrayNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2260 const int unit = BytesPerLong; | |
2261 const TypeX* t = phase->type(in(2))->isa_intptr_t(); | |
2262 if (!t) return NULL; | |
2263 if (!t->is_con()) return NULL; | |
2264 intptr_t raw_count = t->get_con(); | |
2265 intptr_t size = raw_count; | |
2266 if (!Matcher::init_array_count_is_in_bytes) size *= unit; | |
2267 // Clearing nothing uses the Identity call. | |
2268 // Negative clears are possible on dead ClearArrays | |
2269 // (see jck test stmt114.stmt11402.val). | |
2270 if (size <= 0 || size % unit != 0) return NULL; | |
2271 intptr_t count = size / unit; | |
2272 // Length too long; use fast hardware clear | |
2273 if (size > Matcher::init_array_short_size) return NULL; | |
2274 Node *mem = in(1); | |
2275 if( phase->type(mem)==Type::TOP ) return NULL; | |
2276 Node *adr = in(3); | |
2277 const Type* at = phase->type(adr); | |
2278 if( at==Type::TOP ) return NULL; | |
2279 const TypePtr* atp = at->isa_ptr(); | |
2280 // adjust atp to be the correct array element address type | |
2281 if (atp == NULL) atp = TypePtr::BOTTOM; | |
2282 else atp = atp->add_offset(Type::OffsetBot); | |
2283 // Get base for derived pointer purposes | |
2284 if( adr->Opcode() != Op_AddP ) Unimplemented(); | |
2285 Node *base = adr->in(1); | |
2286 | |
2287 Node *zero = phase->makecon(TypeLong::ZERO); | |
2288 Node *off = phase->MakeConX(BytesPerLong); | |
2289 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
2290 count--; | |
2291 while( count-- ) { | |
2292 mem = phase->transform(mem); | |
2293 adr = phase->transform(new (phase->C, 4) AddPNode(base,adr,off)); | |
2294 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
2295 } | |
2296 return mem; | |
2297 } | |
2298 | |
2299 //----------------------------clear_memory------------------------------------- | |
2300 // Generate code to initialize object storage to zero. | |
2301 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2302 intptr_t start_offset, | |
2303 Node* end_offset, | |
2304 PhaseGVN* phase) { | |
2305 Compile* C = phase->C; | |
2306 intptr_t offset = start_offset; | |
2307 | |
2308 int unit = BytesPerLong; | |
2309 if ((offset % unit) != 0) { | |
2310 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(offset)); | |
2311 adr = phase->transform(adr); | |
2312 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2313 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
0 | 2314 mem = phase->transform(mem); |
2315 offset += BytesPerInt; | |
2316 } | |
2317 assert((offset % unit) == 0, ""); | |
2318 | |
2319 // Initialize the remaining stuff, if any, with a ClearArray. | |
2320 return clear_memory(ctl, mem, dest, phase->MakeConX(offset), end_offset, phase); | |
2321 } | |
2322 | |
2323 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2324 Node* start_offset, | |
2325 Node* end_offset, | |
2326 PhaseGVN* phase) { | |
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2327 if (start_offset == end_offset) { |
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2328 // nothing to do |
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2329 return mem; |
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2330 } |
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2331 |
0 | 2332 Compile* C = phase->C; |
2333 int unit = BytesPerLong; | |
2334 Node* zbase = start_offset; | |
2335 Node* zend = end_offset; | |
2336 | |
2337 // Scale to the unit required by the CPU: | |
2338 if (!Matcher::init_array_count_is_in_bytes) { | |
2339 Node* shift = phase->intcon(exact_log2(unit)); | |
2340 zbase = phase->transform( new(C,3) URShiftXNode(zbase, shift) ); | |
2341 zend = phase->transform( new(C,3) URShiftXNode(zend, shift) ); | |
2342 } | |
2343 | |
2344 Node* zsize = phase->transform( new(C,3) SubXNode(zend, zbase) ); | |
2345 Node* zinit = phase->zerocon((unit == BytesPerLong) ? T_LONG : T_INT); | |
2346 | |
2347 // Bulk clear double-words | |
2348 Node* adr = phase->transform( new(C,4) AddPNode(dest, dest, start_offset) ); | |
2349 mem = new (C, 4) ClearArrayNode(ctl, mem, zsize, adr); | |
2350 return phase->transform(mem); | |
2351 } | |
2352 | |
2353 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
2354 intptr_t start_offset, | |
2355 intptr_t end_offset, | |
2356 PhaseGVN* phase) { | |
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2357 if (start_offset == end_offset) { |
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2358 // nothing to do |
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2359 return mem; |
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2360 } |
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2361 |
0 | 2362 Compile* C = phase->C; |
2363 assert((end_offset % BytesPerInt) == 0, "odd end offset"); | |
2364 intptr_t done_offset = end_offset; | |
2365 if ((done_offset % BytesPerLong) != 0) { | |
2366 done_offset -= BytesPerInt; | |
2367 } | |
2368 if (done_offset > start_offset) { | |
2369 mem = clear_memory(ctl, mem, dest, | |
2370 start_offset, phase->MakeConX(done_offset), phase); | |
2371 } | |
2372 if (done_offset < end_offset) { // emit the final 32-bit store | |
2373 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(done_offset)); | |
2374 adr = phase->transform(adr); | |
2375 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
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2376 mem = StoreNode::make(*phase, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); |
0 | 2377 mem = phase->transform(mem); |
2378 done_offset += BytesPerInt; | |
2379 } | |
2380 assert(done_offset == end_offset, ""); | |
2381 return mem; | |
2382 } | |
2383 | |
2384 //============================================================================= | |
2385 // Do we match on this edge? No memory edges | |
2386 uint StrCompNode::match_edge(uint idx) const { | |
2387 return idx == 5 || idx == 6; | |
2388 } | |
2389 | |
2390 //------------------------------Ideal------------------------------------------ | |
2391 // Return a node which is more "ideal" than the current node. Strip out | |
2392 // control copies | |
2393 Node *StrCompNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
2394 return remove_dead_region(phase, can_reshape) ? this : NULL; | |
2395 } | |
2396 | |
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2397 //------------------------------Ideal------------------------------------------ |
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2398 // Return a node which is more "ideal" than the current node. Strip out |
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2399 // control copies |
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2400 Node *AryEqNode::Ideal(PhaseGVN *phase, bool can_reshape){ |
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2401 return remove_dead_region(phase, can_reshape) ? this : NULL; |
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2402 } |
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2403 |
0 | 2404 |
2405 //============================================================================= | |
2406 MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent) | |
2407 : MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)), | |
2408 _adr_type(C->get_adr_type(alias_idx)) | |
2409 { | |
2410 init_class_id(Class_MemBar); | |
2411 Node* top = C->top(); | |
2412 init_req(TypeFunc::I_O,top); | |
2413 init_req(TypeFunc::FramePtr,top); | |
2414 init_req(TypeFunc::ReturnAdr,top); | |
2415 if (precedent != NULL) | |
2416 init_req(TypeFunc::Parms, precedent); | |
2417 } | |
2418 | |
2419 //------------------------------cmp-------------------------------------------- | |
2420 uint MemBarNode::hash() const { return NO_HASH; } | |
2421 uint MemBarNode::cmp( const Node &n ) const { | |
2422 return (&n == this); // Always fail except on self | |
2423 } | |
2424 | |
2425 //------------------------------make------------------------------------------- | |
2426 MemBarNode* MemBarNode::make(Compile* C, int opcode, int atp, Node* pn) { | |
2427 int len = Precedent + (pn == NULL? 0: 1); | |
2428 switch (opcode) { | |
2429 case Op_MemBarAcquire: return new(C, len) MemBarAcquireNode(C, atp, pn); | |
2430 case Op_MemBarRelease: return new(C, len) MemBarReleaseNode(C, atp, pn); | |
2431 case Op_MemBarVolatile: return new(C, len) MemBarVolatileNode(C, atp, pn); | |
2432 case Op_MemBarCPUOrder: return new(C, len) MemBarCPUOrderNode(C, atp, pn); | |
2433 case Op_Initialize: return new(C, len) InitializeNode(C, atp, pn); | |
2434 default: ShouldNotReachHere(); return NULL; | |
2435 } | |
2436 } | |
2437 | |
2438 //------------------------------Ideal------------------------------------------ | |
2439 // Return a node which is more "ideal" than the current node. Strip out | |
2440 // control copies | |
2441 Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
2442 if (remove_dead_region(phase, can_reshape)) return this; | |
2443 return NULL; | |
2444 } | |
2445 | |
2446 //------------------------------Value------------------------------------------ | |
2447 const Type *MemBarNode::Value( PhaseTransform *phase ) const { | |
2448 if( !in(0) ) return Type::TOP; | |
2449 if( phase->type(in(0)) == Type::TOP ) | |
2450 return Type::TOP; | |
2451 return TypeTuple::MEMBAR; | |
2452 } | |
2453 | |
2454 //------------------------------match------------------------------------------ | |
2455 // Construct projections for memory. | |
2456 Node *MemBarNode::match( const ProjNode *proj, const Matcher *m ) { | |
2457 switch (proj->_con) { | |
2458 case TypeFunc::Control: | |
2459 case TypeFunc::Memory: | |
2460 return new (m->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); | |
2461 } | |
2462 ShouldNotReachHere(); | |
2463 return NULL; | |
2464 } | |
2465 | |
2466 //===========================InitializeNode==================================== | |
2467 // SUMMARY: | |
2468 // This node acts as a memory barrier on raw memory, after some raw stores. | |
2469 // The 'cooked' oop value feeds from the Initialize, not the Allocation. | |
2470 // The Initialize can 'capture' suitably constrained stores as raw inits. | |
2471 // It can coalesce related raw stores into larger units (called 'tiles'). | |
2472 // It can avoid zeroing new storage for memory units which have raw inits. | |
2473 // At macro-expansion, it is marked 'complete', and does not optimize further. | |
2474 // | |
2475 // EXAMPLE: | |
2476 // The object 'new short[2]' occupies 16 bytes in a 32-bit machine. | |
2477 // ctl = incoming control; mem* = incoming memory | |
2478 // (Note: A star * on a memory edge denotes I/O and other standard edges.) | |
2479 // First allocate uninitialized memory and fill in the header: | |
2480 // alloc = (Allocate ctl mem* 16 #short[].klass ...) | |
2481 // ctl := alloc.Control; mem* := alloc.Memory* | |
2482 // rawmem = alloc.Memory; rawoop = alloc.RawAddress | |
2483 // Then initialize to zero the non-header parts of the raw memory block: | |
2484 // init = (Initialize alloc.Control alloc.Memory* alloc.RawAddress) | |
2485 // ctl := init.Control; mem.SLICE(#short[*]) := init.Memory | |
2486 // After the initialize node executes, the object is ready for service: | |
2487 // oop := (CheckCastPP init.Control alloc.RawAddress #short[]) | |
2488 // Suppose its body is immediately initialized as {1,2}: | |
2489 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
2490 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
2491 // mem.SLICE(#short[*]) := store2 | |
2492 // | |
2493 // DETAILS: | |
2494 // An InitializeNode collects and isolates object initialization after | |
2495 // an AllocateNode and before the next possible safepoint. As a | |
2496 // memory barrier (MemBarNode), it keeps critical stores from drifting | |
2497 // down past any safepoint or any publication of the allocation. | |
2498 // Before this barrier, a newly-allocated object may have uninitialized bits. | |
2499 // After this barrier, it may be treated as a real oop, and GC is allowed. | |
2500 // | |
2501 // The semantics of the InitializeNode include an implicit zeroing of | |
2502 // the new object from object header to the end of the object. | |
2503 // (The object header and end are determined by the AllocateNode.) | |
2504 // | |
2505 // Certain stores may be added as direct inputs to the InitializeNode. | |
2506 // These stores must update raw memory, and they must be to addresses | |
2507 // derived from the raw address produced by AllocateNode, and with | |
2508 // a constant offset. They must be ordered by increasing offset. | |
2509 // The first one is at in(RawStores), the last at in(req()-1). | |
2510 // Unlike most memory operations, they are not linked in a chain, | |
2511 // but are displayed in parallel as users of the rawmem output of | |
2512 // the allocation. | |
2513 // | |
2514 // (See comments in InitializeNode::capture_store, which continue | |
2515 // the example given above.) | |
2516 // | |
2517 // When the associated Allocate is macro-expanded, the InitializeNode | |
2518 // may be rewritten to optimize collected stores. A ClearArrayNode | |
2519 // may also be created at that point to represent any required zeroing. | |
2520 // The InitializeNode is then marked 'complete', prohibiting further | |
2521 // capturing of nearby memory operations. | |
2522 // | |
2523 // During macro-expansion, all captured initializations which store | |
2524 // constant values of 32 bits or smaller are coalesced (if advantagous) | |
2525 // into larger 'tiles' 32 or 64 bits. This allows an object to be | |
2526 // initialized in fewer memory operations. Memory words which are | |
2527 // covered by neither tiles nor non-constant stores are pre-zeroed | |
2528 // by explicit stores of zero. (The code shape happens to do all | |
2529 // zeroing first, then all other stores, with both sequences occurring | |
2530 // in order of ascending offsets.) | |
2531 // | |
2532 // Alternatively, code may be inserted between an AllocateNode and its | |
2533 // InitializeNode, to perform arbitrary initialization of the new object. | |
2534 // E.g., the object copying intrinsics insert complex data transfers here. | |
2535 // The initialization must then be marked as 'complete' disable the | |
2536 // built-in zeroing semantics and the collection of initializing stores. | |
2537 // | |
2538 // While an InitializeNode is incomplete, reads from the memory state | |
2539 // produced by it are optimizable if they match the control edge and | |
2540 // new oop address associated with the allocation/initialization. | |
2541 // They return a stored value (if the offset matches) or else zero. | |
2542 // A write to the memory state, if it matches control and address, | |
2543 // and if it is to a constant offset, may be 'captured' by the | |
2544 // InitializeNode. It is cloned as a raw memory operation and rewired | |
2545 // inside the initialization, to the raw oop produced by the allocation. | |
2546 // Operations on addresses which are provably distinct (e.g., to | |
2547 // other AllocateNodes) are allowed to bypass the initialization. | |
2548 // | |
2549 // The effect of all this is to consolidate object initialization | |
2550 // (both arrays and non-arrays, both piecewise and bulk) into a | |
2551 // single location, where it can be optimized as a unit. | |
2552 // | |
2553 // Only stores with an offset less than TrackedInitializationLimit words | |
2554 // will be considered for capture by an InitializeNode. This puts a | |
2555 // reasonable limit on the complexity of optimized initializations. | |
2556 | |
2557 //---------------------------InitializeNode------------------------------------ | |
2558 InitializeNode::InitializeNode(Compile* C, int adr_type, Node* rawoop) | |
2559 : _is_complete(false), | |
2560 MemBarNode(C, adr_type, rawoop) | |
2561 { | |
2562 init_class_id(Class_Initialize); | |
2563 | |
2564 assert(adr_type == Compile::AliasIdxRaw, "only valid atp"); | |
2565 assert(in(RawAddress) == rawoop, "proper init"); | |
2566 // Note: allocation() can be NULL, for secondary initialization barriers | |
2567 } | |
2568 | |
2569 // Since this node is not matched, it will be processed by the | |
2570 // register allocator. Declare that there are no constraints | |
2571 // on the allocation of the RawAddress edge. | |
2572 const RegMask &InitializeNode::in_RegMask(uint idx) const { | |
2573 // This edge should be set to top, by the set_complete. But be conservative. | |
2574 if (idx == InitializeNode::RawAddress) | |
2575 return *(Compile::current()->matcher()->idealreg2spillmask[in(idx)->ideal_reg()]); | |
2576 return RegMask::Empty; | |
2577 } | |
2578 | |
2579 Node* InitializeNode::memory(uint alias_idx) { | |
2580 Node* mem = in(Memory); | |
2581 if (mem->is_MergeMem()) { | |
2582 return mem->as_MergeMem()->memory_at(alias_idx); | |
2583 } else { | |
2584 // incoming raw memory is not split | |
2585 return mem; | |
2586 } | |
2587 } | |
2588 | |
2589 bool InitializeNode::is_non_zero() { | |
2590 if (is_complete()) return false; | |
2591 remove_extra_zeroes(); | |
2592 return (req() > RawStores); | |
2593 } | |
2594 | |
2595 void InitializeNode::set_complete(PhaseGVN* phase) { | |
2596 assert(!is_complete(), "caller responsibility"); | |
2597 _is_complete = true; | |
2598 | |
2599 // After this node is complete, it contains a bunch of | |
2600 // raw-memory initializations. There is no need for | |
2601 // it to have anything to do with non-raw memory effects. | |
2602 // Therefore, tell all non-raw users to re-optimize themselves, | |
2603 // after skipping the memory effects of this initialization. | |
2604 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
2605 if (igvn) igvn->add_users_to_worklist(this); | |
2606 } | |
2607 | |
2608 // convenience function | |
2609 // return false if the init contains any stores already | |
2610 bool AllocateNode::maybe_set_complete(PhaseGVN* phase) { | |
2611 InitializeNode* init = initialization(); | |
2612 if (init == NULL || init->is_complete()) return false; | |
2613 init->remove_extra_zeroes(); | |
2614 // for now, if this allocation has already collected any inits, bail: | |
2615 if (init->is_non_zero()) return false; | |
2616 init->set_complete(phase); | |
2617 return true; | |
2618 } | |
2619 | |
2620 void InitializeNode::remove_extra_zeroes() { | |
2621 if (req() == RawStores) return; | |
2622 Node* zmem = zero_memory(); | |
2623 uint fill = RawStores; | |
2624 for (uint i = fill; i < req(); i++) { | |
2625 Node* n = in(i); | |
2626 if (n->is_top() || n == zmem) continue; // skip | |
2627 if (fill < i) set_req(fill, n); // compact | |
2628 ++fill; | |
2629 } | |
2630 // delete any empty spaces created: | |
2631 while (fill < req()) { | |
2632 del_req(fill); | |
2633 } | |
2634 } | |
2635 | |
2636 // Helper for remembering which stores go with which offsets. | |
2637 intptr_t InitializeNode::get_store_offset(Node* st, PhaseTransform* phase) { | |
2638 if (!st->is_Store()) return -1; // can happen to dead code via subsume_node | |
2639 intptr_t offset = -1; | |
2640 Node* base = AddPNode::Ideal_base_and_offset(st->in(MemNode::Address), | |
2641 phase, offset); | |
2642 if (base == NULL) return -1; // something is dead, | |
2643 if (offset < 0) return -1; // dead, dead | |
2644 return offset; | |
2645 } | |
2646 | |
2647 // Helper for proving that an initialization expression is | |
2648 // "simple enough" to be folded into an object initialization. | |
2649 // Attempts to prove that a store's initial value 'n' can be captured | |
2650 // within the initialization without creating a vicious cycle, such as: | |
2651 // { Foo p = new Foo(); p.next = p; } | |
2652 // True for constants and parameters and small combinations thereof. | |
2653 bool InitializeNode::detect_init_independence(Node* n, | |
2654 bool st_is_pinned, | |
2655 int& count) { | |
2656 if (n == NULL) return true; // (can this really happen?) | |
2657 if (n->is_Proj()) n = n->in(0); | |
2658 if (n == this) return false; // found a cycle | |
2659 if (n->is_Con()) return true; | |
2660 if (n->is_Start()) return true; // params, etc., are OK | |
2661 if (n->is_Root()) return true; // even better | |
2662 | |
2663 Node* ctl = n->in(0); | |
2664 if (ctl != NULL && !ctl->is_top()) { | |
2665 if (ctl->is_Proj()) ctl = ctl->in(0); | |
2666 if (ctl == this) return false; | |
2667 | |
2668 // If we already know that the enclosing memory op is pinned right after | |
2669 // the init, then any control flow that the store has picked up | |
2670 // must have preceded the init, or else be equal to the init. | |
2671 // Even after loop optimizations (which might change control edges) | |
2672 // a store is never pinned *before* the availability of its inputs. | |
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2673 if (!MemNode::all_controls_dominate(n, this)) |
0 | 2674 return false; // failed to prove a good control |
2675 | |
2676 } | |
2677 | |
2678 // Check data edges for possible dependencies on 'this'. | |
2679 if ((count += 1) > 20) return false; // complexity limit | |
2680 for (uint i = 1; i < n->req(); i++) { | |
2681 Node* m = n->in(i); | |
2682 if (m == NULL || m == n || m->is_top()) continue; | |
2683 uint first_i = n->find_edge(m); | |
2684 if (i != first_i) continue; // process duplicate edge just once | |
2685 if (!detect_init_independence(m, st_is_pinned, count)) { | |
2686 return false; | |
2687 } | |
2688 } | |
2689 | |
2690 return true; | |
2691 } | |
2692 | |
2693 // Here are all the checks a Store must pass before it can be moved into | |
2694 // an initialization. Returns zero if a check fails. | |
2695 // On success, returns the (constant) offset to which the store applies, | |
2696 // within the initialized memory. | |
2697 intptr_t InitializeNode::can_capture_store(StoreNode* st, PhaseTransform* phase) { | |
2698 const int FAIL = 0; | |
2699 if (st->req() != MemNode::ValueIn + 1) | |
2700 return FAIL; // an inscrutable StoreNode (card mark?) | |
2701 Node* ctl = st->in(MemNode::Control); | |
2702 if (!(ctl != NULL && ctl->is_Proj() && ctl->in(0) == this)) | |
2703 return FAIL; // must be unconditional after the initialization | |
2704 Node* mem = st->in(MemNode::Memory); | |
2705 if (!(mem->is_Proj() && mem->in(0) == this)) | |
2706 return FAIL; // must not be preceded by other stores | |
2707 Node* adr = st->in(MemNode::Address); | |
2708 intptr_t offset; | |
2709 AllocateNode* alloc = AllocateNode::Ideal_allocation(adr, phase, offset); | |
2710 if (alloc == NULL) | |
2711 return FAIL; // inscrutable address | |
2712 if (alloc != allocation()) | |
2713 return FAIL; // wrong allocation! (store needs to float up) | |
2714 Node* val = st->in(MemNode::ValueIn); | |
2715 int complexity_count = 0; | |
2716 if (!detect_init_independence(val, true, complexity_count)) | |
2717 return FAIL; // stored value must be 'simple enough' | |
2718 | |
2719 return offset; // success | |
2720 } | |
2721 | |
2722 // Find the captured store in(i) which corresponds to the range | |
2723 // [start..start+size) in the initialized object. | |
2724 // If there is one, return its index i. If there isn't, return the | |
2725 // negative of the index where it should be inserted. | |
2726 // Return 0 if the queried range overlaps an initialization boundary | |
2727 // or if dead code is encountered. | |
2728 // If size_in_bytes is zero, do not bother with overlap checks. | |
2729 int InitializeNode::captured_store_insertion_point(intptr_t start, | |
2730 int size_in_bytes, | |
2731 PhaseTransform* phase) { | |
2732 const int FAIL = 0, MAX_STORE = BytesPerLong; | |
2733 | |
2734 if (is_complete()) | |
2735 return FAIL; // arraycopy got here first; punt | |
2736 | |
2737 assert(allocation() != NULL, "must be present"); | |
2738 | |
2739 // no negatives, no header fields: | |
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2740 if (start < (intptr_t) allocation()->minimum_header_size()) return FAIL; |
0 | 2741 |
2742 // after a certain size, we bail out on tracking all the stores: | |
2743 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
2744 if (start >= ti_limit) return FAIL; | |
2745 | |
2746 for (uint i = InitializeNode::RawStores, limit = req(); ; ) { | |
2747 if (i >= limit) return -(int)i; // not found; here is where to put it | |
2748 | |
2749 Node* st = in(i); | |
2750 intptr_t st_off = get_store_offset(st, phase); | |
2751 if (st_off < 0) { | |
2752 if (st != zero_memory()) { | |
2753 return FAIL; // bail out if there is dead garbage | |
2754 } | |
2755 } else if (st_off > start) { | |
2756 // ...we are done, since stores are ordered | |
2757 if (st_off < start + size_in_bytes) { | |
2758 return FAIL; // the next store overlaps | |
2759 } | |
2760 return -(int)i; // not found; here is where to put it | |
2761 } else if (st_off < start) { | |
2762 if (size_in_bytes != 0 && | |
2763 start < st_off + MAX_STORE && | |
2764 start < st_off + st->as_Store()->memory_size()) { | |
2765 return FAIL; // the previous store overlaps | |
2766 } | |
2767 } else { | |
2768 if (size_in_bytes != 0 && | |
2769 st->as_Store()->memory_size() != size_in_bytes) { | |
2770 return FAIL; // mismatched store size | |
2771 } | |
2772 return i; | |
2773 } | |
2774 | |
2775 ++i; | |
2776 } | |
2777 } | |
2778 | |
2779 // Look for a captured store which initializes at the offset 'start' | |
2780 // with the given size. If there is no such store, and no other | |
2781 // initialization interferes, then return zero_memory (the memory | |
2782 // projection of the AllocateNode). | |
2783 Node* InitializeNode::find_captured_store(intptr_t start, int size_in_bytes, | |
2784 PhaseTransform* phase) { | |
2785 assert(stores_are_sane(phase), ""); | |
2786 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
2787 if (i == 0) { | |
2788 return NULL; // something is dead | |
2789 } else if (i < 0) { | |
2790 return zero_memory(); // just primordial zero bits here | |
2791 } else { | |
2792 Node* st = in(i); // here is the store at this position | |
2793 assert(get_store_offset(st->as_Store(), phase) == start, "sanity"); | |
2794 return st; | |
2795 } | |
2796 } | |
2797 | |
2798 // Create, as a raw pointer, an address within my new object at 'offset'. | |
2799 Node* InitializeNode::make_raw_address(intptr_t offset, | |
2800 PhaseTransform* phase) { | |
2801 Node* addr = in(RawAddress); | |
2802 if (offset != 0) { | |
2803 Compile* C = phase->C; | |
2804 addr = phase->transform( new (C, 4) AddPNode(C->top(), addr, | |
2805 phase->MakeConX(offset)) ); | |
2806 } | |
2807 return addr; | |
2808 } | |
2809 | |
2810 // Clone the given store, converting it into a raw store | |
2811 // initializing a field or element of my new object. | |
2812 // Caller is responsible for retiring the original store, | |
2813 // with subsume_node or the like. | |
2814 // | |
2815 // From the example above InitializeNode::InitializeNode, | |
2816 // here are the old stores to be captured: | |
2817 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
2818 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
2819 // | |
2820 // Here is the changed code; note the extra edges on init: | |
2821 // alloc = (Allocate ...) | |
2822 // rawoop = alloc.RawAddress | |
2823 // rawstore1 = (StoreC alloc.Control alloc.Memory (+ rawoop 12) 1) | |
2824 // rawstore2 = (StoreC alloc.Control alloc.Memory (+ rawoop 14) 2) | |
2825 // init = (Initialize alloc.Control alloc.Memory rawoop | |
2826 // rawstore1 rawstore2) | |
2827 // | |
2828 Node* InitializeNode::capture_store(StoreNode* st, intptr_t start, | |
2829 PhaseTransform* phase) { | |
2830 assert(stores_are_sane(phase), ""); | |
2831 | |
2832 if (start < 0) return NULL; | |
2833 assert(can_capture_store(st, phase) == start, "sanity"); | |
2834 | |
2835 Compile* C = phase->C; | |
2836 int size_in_bytes = st->memory_size(); | |
2837 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
2838 if (i == 0) return NULL; // bail out | |
2839 Node* prev_mem = NULL; // raw memory for the captured store | |
2840 if (i > 0) { | |
2841 prev_mem = in(i); // there is a pre-existing store under this one | |
2842 set_req(i, C->top()); // temporarily disconnect it | |
2843 // See StoreNode::Ideal 'st->outcnt() == 1' for the reason to disconnect. | |
2844 } else { | |
2845 i = -i; // no pre-existing store | |
2846 prev_mem = zero_memory(); // a slice of the newly allocated object | |
2847 if (i > InitializeNode::RawStores && in(i-1) == prev_mem) | |
2848 set_req(--i, C->top()); // reuse this edge; it has been folded away | |
2849 else | |
2850 ins_req(i, C->top()); // build a new edge | |
2851 } | |
2852 Node* new_st = st->clone(); | |
2853 new_st->set_req(MemNode::Control, in(Control)); | |
2854 new_st->set_req(MemNode::Memory, prev_mem); | |
2855 new_st->set_req(MemNode::Address, make_raw_address(start, phase)); | |
2856 new_st = phase->transform(new_st); | |
2857 | |
2858 // At this point, new_st might have swallowed a pre-existing store | |
2859 // at the same offset, or perhaps new_st might have disappeared, | |
2860 // if it redundantly stored the same value (or zero to fresh memory). | |
2861 | |
2862 // In any case, wire it in: | |
2863 set_req(i, new_st); | |
2864 | |
2865 // The caller may now kill the old guy. | |
2866 DEBUG_ONLY(Node* check_st = find_captured_store(start, size_in_bytes, phase)); | |
2867 assert(check_st == new_st || check_st == NULL, "must be findable"); | |
2868 assert(!is_complete(), ""); | |
2869 return new_st; | |
2870 } | |
2871 | |
2872 static bool store_constant(jlong* tiles, int num_tiles, | |
2873 intptr_t st_off, int st_size, | |
2874 jlong con) { | |
2875 if ((st_off & (st_size-1)) != 0) | |
2876 return false; // strange store offset (assume size==2**N) | |
2877 address addr = (address)tiles + st_off; | |
2878 assert(st_off >= 0 && addr+st_size <= (address)&tiles[num_tiles], "oob"); | |
2879 switch (st_size) { | |
2880 case sizeof(jbyte): *(jbyte*) addr = (jbyte) con; break; | |
2881 case sizeof(jchar): *(jchar*) addr = (jchar) con; break; | |
2882 case sizeof(jint): *(jint*) addr = (jint) con; break; | |
2883 case sizeof(jlong): *(jlong*) addr = (jlong) con; break; | |
2884 default: return false; // strange store size (detect size!=2**N here) | |
2885 } | |
2886 return true; // return success to caller | |
2887 } | |
2888 | |
2889 // Coalesce subword constants into int constants and possibly | |
2890 // into long constants. The goal, if the CPU permits, | |
2891 // is to initialize the object with a small number of 64-bit tiles. | |
2892 // Also, convert floating-point constants to bit patterns. | |
2893 // Non-constants are not relevant to this pass. | |
2894 // | |
2895 // In terms of the running example on InitializeNode::InitializeNode | |
2896 // and InitializeNode::capture_store, here is the transformation | |
2897 // of rawstore1 and rawstore2 into rawstore12: | |
2898 // alloc = (Allocate ...) | |
2899 // rawoop = alloc.RawAddress | |
2900 // tile12 = 0x00010002 | |
2901 // rawstore12 = (StoreI alloc.Control alloc.Memory (+ rawoop 12) tile12) | |
2902 // init = (Initialize alloc.Control alloc.Memory rawoop rawstore12) | |
2903 // | |
2904 void | |
2905 InitializeNode::coalesce_subword_stores(intptr_t header_size, | |
2906 Node* size_in_bytes, | |
2907 PhaseGVN* phase) { | |
2908 Compile* C = phase->C; | |
2909 | |
2910 assert(stores_are_sane(phase), ""); | |
2911 // Note: After this pass, they are not completely sane, | |
2912 // since there may be some overlaps. | |
2913 | |
2914 int old_subword = 0, old_long = 0, new_int = 0, new_long = 0; | |
2915 | |
2916 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
2917 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, ti_limit); | |
2918 size_limit = MIN2(size_limit, ti_limit); | |
2919 size_limit = align_size_up(size_limit, BytesPerLong); | |
2920 int num_tiles = size_limit / BytesPerLong; | |
2921 | |
2922 // allocate space for the tile map: | |
2923 const int small_len = DEBUG_ONLY(true ? 3 :) 30; // keep stack frames small | |
2924 jlong tiles_buf[small_len]; | |
2925 Node* nodes_buf[small_len]; | |
2926 jlong inits_buf[small_len]; | |
2927 jlong* tiles = ((num_tiles <= small_len) ? &tiles_buf[0] | |
2928 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
2929 Node** nodes = ((num_tiles <= small_len) ? &nodes_buf[0] | |
2930 : NEW_RESOURCE_ARRAY(Node*, num_tiles)); | |
2931 jlong* inits = ((num_tiles <= small_len) ? &inits_buf[0] | |
2932 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
2933 // tiles: exact bitwise model of all primitive constants | |
2934 // nodes: last constant-storing node subsumed into the tiles model | |
2935 // inits: which bytes (in each tile) are touched by any initializations | |
2936 | |
2937 //// Pass A: Fill in the tile model with any relevant stores. | |
2938 | |
2939 Copy::zero_to_bytes(tiles, sizeof(tiles[0]) * num_tiles); | |
2940 Copy::zero_to_bytes(nodes, sizeof(nodes[0]) * num_tiles); | |
2941 Copy::zero_to_bytes(inits, sizeof(inits[0]) * num_tiles); | |
2942 Node* zmem = zero_memory(); // initially zero memory state | |
2943 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
2944 Node* st = in(i); | |
2945 intptr_t st_off = get_store_offset(st, phase); | |
2946 | |
2947 // Figure out the store's offset and constant value: | |
2948 if (st_off < header_size) continue; //skip (ignore header) | |
2949 if (st->in(MemNode::Memory) != zmem) continue; //skip (odd store chain) | |
2950 int st_size = st->as_Store()->memory_size(); | |
2951 if (st_off + st_size > size_limit) break; | |
2952 | |
2953 // Record which bytes are touched, whether by constant or not. | |
2954 if (!store_constant(inits, num_tiles, st_off, st_size, (jlong) -1)) | |
2955 continue; // skip (strange store size) | |
2956 | |
2957 const Type* val = phase->type(st->in(MemNode::ValueIn)); | |
2958 if (!val->singleton()) continue; //skip (non-con store) | |
2959 BasicType type = val->basic_type(); | |
2960 | |
2961 jlong con = 0; | |
2962 switch (type) { | |
2963 case T_INT: con = val->is_int()->get_con(); break; | |
2964 case T_LONG: con = val->is_long()->get_con(); break; | |
2965 case T_FLOAT: con = jint_cast(val->getf()); break; | |
2966 case T_DOUBLE: con = jlong_cast(val->getd()); break; | |
2967 default: continue; //skip (odd store type) | |
2968 } | |
2969 | |
2970 if (type == T_LONG && Matcher::isSimpleConstant64(con) && | |
2971 st->Opcode() == Op_StoreL) { | |
2972 continue; // This StoreL is already optimal. | |
2973 } | |
2974 | |
2975 // Store down the constant. | |
2976 store_constant(tiles, num_tiles, st_off, st_size, con); | |
2977 | |
2978 intptr_t j = st_off >> LogBytesPerLong; | |
2979 | |
2980 if (type == T_INT && st_size == BytesPerInt | |
2981 && (st_off & BytesPerInt) == BytesPerInt) { | |
2982 jlong lcon = tiles[j]; | |
2983 if (!Matcher::isSimpleConstant64(lcon) && | |
2984 st->Opcode() == Op_StoreI) { | |
2985 // This StoreI is already optimal by itself. | |
2986 jint* intcon = (jint*) &tiles[j]; | |
2987 intcon[1] = 0; // undo the store_constant() | |
2988 | |
2989 // If the previous store is also optimal by itself, back up and | |
2990 // undo the action of the previous loop iteration... if we can. | |
2991 // But if we can't, just let the previous half take care of itself. | |
2992 st = nodes[j]; | |
2993 st_off -= BytesPerInt; | |
2994 con = intcon[0]; | |
2995 if (con != 0 && st != NULL && st->Opcode() == Op_StoreI) { | |
2996 assert(st_off >= header_size, "still ignoring header"); | |
2997 assert(get_store_offset(st, phase) == st_off, "must be"); | |
2998 assert(in(i-1) == zmem, "must be"); | |
2999 DEBUG_ONLY(const Type* tcon = phase->type(st->in(MemNode::ValueIn))); | |
3000 assert(con == tcon->is_int()->get_con(), "must be"); | |
3001 // Undo the effects of the previous loop trip, which swallowed st: | |
3002 intcon[0] = 0; // undo store_constant() | |
3003 set_req(i-1, st); // undo set_req(i, zmem) | |
3004 nodes[j] = NULL; // undo nodes[j] = st | |
3005 --old_subword; // undo ++old_subword | |
3006 } | |
3007 continue; // This StoreI is already optimal. | |
3008 } | |
3009 } | |
3010 | |
3011 // This store is not needed. | |
3012 set_req(i, zmem); | |
3013 nodes[j] = st; // record for the moment | |
3014 if (st_size < BytesPerLong) // something has changed | |
3015 ++old_subword; // includes int/float, but who's counting... | |
3016 else ++old_long; | |
3017 } | |
3018 | |
3019 if ((old_subword + old_long) == 0) | |
3020 return; // nothing more to do | |
3021 | |
3022 //// Pass B: Convert any non-zero tiles into optimal constant stores. | |
3023 // Be sure to insert them before overlapping non-constant stores. | |
3024 // (E.g., byte[] x = { 1,2,y,4 } => x[int 0] = 0x01020004, x[2]=y.) | |
3025 for (int j = 0; j < num_tiles; j++) { | |
3026 jlong con = tiles[j]; | |
3027 jlong init = inits[j]; | |
3028 if (con == 0) continue; | |
3029 jint con0, con1; // split the constant, address-wise | |
3030 jint init0, init1; // split the init map, address-wise | |
3031 { union { jlong con; jint intcon[2]; } u; | |
3032 u.con = con; | |
3033 con0 = u.intcon[0]; | |
3034 con1 = u.intcon[1]; | |
3035 u.con = init; | |
3036 init0 = u.intcon[0]; | |
3037 init1 = u.intcon[1]; | |
3038 } | |
3039 | |
3040 Node* old = nodes[j]; | |
3041 assert(old != NULL, "need the prior store"); | |
3042 intptr_t offset = (j * BytesPerLong); | |
3043 | |
3044 bool split = !Matcher::isSimpleConstant64(con); | |
3045 | |
3046 if (offset < header_size) { | |
3047 assert(offset + BytesPerInt >= header_size, "second int counts"); | |
3048 assert(*(jint*)&tiles[j] == 0, "junk in header"); | |
3049 split = true; // only the second word counts | |
3050 // Example: int a[] = { 42 ... } | |
3051 } else if (con0 == 0 && init0 == -1) { | |
3052 split = true; // first word is covered by full inits | |
3053 // Example: int a[] = { ... foo(), 42 ... } | |
3054 } else if (con1 == 0 && init1 == -1) { | |
3055 split = true; // second word is covered by full inits | |
3056 // Example: int a[] = { ... 42, foo() ... } | |
3057 } | |
3058 | |
3059 // Here's a case where init0 is neither 0 nor -1: | |
3060 // byte a[] = { ... 0,0,foo(),0, 0,0,0,42 ... } | |
3061 // Assuming big-endian memory, init0, init1 are 0x0000FF00, 0x000000FF. | |
3062 // In this case the tile is not split; it is (jlong)42. | |
3063 // The big tile is stored down, and then the foo() value is inserted. | |
3064 // (If there were foo(),foo() instead of foo(),0, init0 would be -1.) | |
3065 | |
3066 Node* ctl = old->in(MemNode::Control); | |
3067 Node* adr = make_raw_address(offset, phase); | |
3068 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
3069 | |
3070 // One or two coalesced stores to plop down. | |
3071 Node* st[2]; | |
3072 intptr_t off[2]; | |
3073 int nst = 0; | |
3074 if (!split) { | |
3075 ++new_long; | |
3076 off[nst] = offset; | |
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3077 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3078 phase->longcon(con), T_LONG); |
3079 } else { | |
3080 // Omit either if it is a zero. | |
3081 if (con0 != 0) { | |
3082 ++new_int; | |
3083 off[nst] = offset; | |
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3084 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3085 phase->intcon(con0), T_INT); |
3086 } | |
3087 if (con1 != 0) { | |
3088 ++new_int; | |
3089 offset += BytesPerInt; | |
3090 adr = make_raw_address(offset, phase); | |
3091 off[nst] = offset; | |
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3092 st[nst++] = StoreNode::make(*phase, ctl, zmem, adr, atp, |
0 | 3093 phase->intcon(con1), T_INT); |
3094 } | |
3095 } | |
3096 | |
3097 // Insert second store first, then the first before the second. | |
3098 // Insert each one just before any overlapping non-constant stores. | |
3099 while (nst > 0) { | |
3100 Node* st1 = st[--nst]; | |
3101 C->copy_node_notes_to(st1, old); | |
3102 st1 = phase->transform(st1); | |
3103 offset = off[nst]; | |
3104 assert(offset >= header_size, "do not smash header"); | |
3105 int ins_idx = captured_store_insertion_point(offset, /*size:*/0, phase); | |
3106 guarantee(ins_idx != 0, "must re-insert constant store"); | |
3107 if (ins_idx < 0) ins_idx = -ins_idx; // never overlap | |
3108 if (ins_idx > InitializeNode::RawStores && in(ins_idx-1) == zmem) | |
3109 set_req(--ins_idx, st1); | |
3110 else | |
3111 ins_req(ins_idx, st1); | |
3112 } | |
3113 } | |
3114 | |
3115 if (PrintCompilation && WizardMode) | |
3116 tty->print_cr("Changed %d/%d subword/long constants into %d/%d int/long", | |
3117 old_subword, old_long, new_int, new_long); | |
3118 if (C->log() != NULL) | |
3119 C->log()->elem("comment that='%d/%d subword/long to %d/%d int/long'", | |
3120 old_subword, old_long, new_int, new_long); | |
3121 | |
3122 // Clean up any remaining occurrences of zmem: | |
3123 remove_extra_zeroes(); | |
3124 } | |
3125 | |
3126 // Explore forward from in(start) to find the first fully initialized | |
3127 // word, and return its offset. Skip groups of subword stores which | |
3128 // together initialize full words. If in(start) is itself part of a | |
3129 // fully initialized word, return the offset of in(start). If there | |
3130 // are no following full-word stores, or if something is fishy, return | |
3131 // a negative value. | |
3132 intptr_t InitializeNode::find_next_fullword_store(uint start, PhaseGVN* phase) { | |
3133 int int_map = 0; | |
3134 intptr_t int_map_off = 0; | |
3135 const int FULL_MAP = right_n_bits(BytesPerInt); // the int_map we hope for | |
3136 | |
3137 for (uint i = start, limit = req(); i < limit; i++) { | |
3138 Node* st = in(i); | |
3139 | |
3140 intptr_t st_off = get_store_offset(st, phase); | |
3141 if (st_off < 0) break; // return conservative answer | |
3142 | |
3143 int st_size = st->as_Store()->memory_size(); | |
3144 if (st_size >= BytesPerInt && (st_off % BytesPerInt) == 0) { | |
3145 return st_off; // we found a complete word init | |
3146 } | |
3147 | |
3148 // update the map: | |
3149 | |
3150 intptr_t this_int_off = align_size_down(st_off, BytesPerInt); | |
3151 if (this_int_off != int_map_off) { | |
3152 // reset the map: | |
3153 int_map = 0; | |
3154 int_map_off = this_int_off; | |
3155 } | |
3156 | |
3157 int subword_off = st_off - this_int_off; | |
3158 int_map |= right_n_bits(st_size) << subword_off; | |
3159 if ((int_map & FULL_MAP) == FULL_MAP) { | |
3160 return this_int_off; // we found a complete word init | |
3161 } | |
3162 | |
3163 // Did this store hit or cross the word boundary? | |
3164 intptr_t next_int_off = align_size_down(st_off + st_size, BytesPerInt); | |
3165 if (next_int_off == this_int_off + BytesPerInt) { | |
3166 // We passed the current int, without fully initializing it. | |
3167 int_map_off = next_int_off; | |
3168 int_map >>= BytesPerInt; | |
3169 } else if (next_int_off > this_int_off + BytesPerInt) { | |
3170 // We passed the current and next int. | |
3171 return this_int_off + BytesPerInt; | |
3172 } | |
3173 } | |
3174 | |
3175 return -1; | |
3176 } | |
3177 | |
3178 | |
3179 // Called when the associated AllocateNode is expanded into CFG. | |
3180 // At this point, we may perform additional optimizations. | |
3181 // Linearize the stores by ascending offset, to make memory | |
3182 // activity as coherent as possible. | |
3183 Node* InitializeNode::complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
3184 intptr_t header_size, | |
3185 Node* size_in_bytes, | |
3186 PhaseGVN* phase) { | |
3187 assert(!is_complete(), "not already complete"); | |
3188 assert(stores_are_sane(phase), ""); | |
3189 assert(allocation() != NULL, "must be present"); | |
3190 | |
3191 remove_extra_zeroes(); | |
3192 | |
3193 if (ReduceFieldZeroing || ReduceBulkZeroing) | |
3194 // reduce instruction count for common initialization patterns | |
3195 coalesce_subword_stores(header_size, size_in_bytes, phase); | |
3196 | |
3197 Node* zmem = zero_memory(); // initially zero memory state | |
3198 Node* inits = zmem; // accumulating a linearized chain of inits | |
3199 #ifdef ASSERT | |
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3200 intptr_t first_offset = allocation()->minimum_header_size(); |
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3201 intptr_t last_init_off = first_offset; // previous init offset |
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3202 intptr_t last_init_end = first_offset; // previous init offset+size |
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3203 intptr_t last_tile_end = first_offset; // previous tile offset+size |
0 | 3204 #endif |
3205 intptr_t zeroes_done = header_size; | |
3206 | |
3207 bool do_zeroing = true; // we might give up if inits are very sparse | |
3208 int big_init_gaps = 0; // how many large gaps have we seen? | |
3209 | |
3210 if (ZeroTLAB) do_zeroing = false; | |
3211 if (!ReduceFieldZeroing && !ReduceBulkZeroing) do_zeroing = false; | |
3212 | |
3213 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
3214 Node* st = in(i); | |
3215 intptr_t st_off = get_store_offset(st, phase); | |
3216 if (st_off < 0) | |
3217 break; // unknown junk in the inits | |
3218 if (st->in(MemNode::Memory) != zmem) | |
3219 break; // complicated store chains somehow in list | |
3220 | |
3221 int st_size = st->as_Store()->memory_size(); | |
3222 intptr_t next_init_off = st_off + st_size; | |
3223 | |
3224 if (do_zeroing && zeroes_done < next_init_off) { | |
3225 // See if this store needs a zero before it or under it. | |
3226 intptr_t zeroes_needed = st_off; | |
3227 | |
3228 if (st_size < BytesPerInt) { | |
3229 // Look for subword stores which only partially initialize words. | |
3230 // If we find some, we must lay down some word-level zeroes first, | |
3231 // underneath the subword stores. | |
3232 // | |
3233 // Examples: | |
3234 // byte[] a = { p,q,r,s } => a[0]=p,a[1]=q,a[2]=r,a[3]=s | |
3235 // byte[] a = { x,y,0,0 } => a[0..3] = 0, a[0]=x,a[1]=y | |
3236 // byte[] a = { 0,0,z,0 } => a[0..3] = 0, a[2]=z | |
3237 // | |
3238 // Note: coalesce_subword_stores may have already done this, | |
3239 // if it was prompted by constant non-zero subword initializers. | |
3240 // But this case can still arise with non-constant stores. | |
3241 | |
3242 intptr_t next_full_store = find_next_fullword_store(i, phase); | |
3243 | |
3244 // In the examples above: | |
3245 // in(i) p q r s x y z | |
3246 // st_off 12 13 14 15 12 13 14 | |
3247 // st_size 1 1 1 1 1 1 1 | |
3248 // next_full_s. 12 16 16 16 16 16 16 | |
3249 // z's_done 12 16 16 16 12 16 12 | |
3250 // z's_needed 12 16 16 16 16 16 16 | |
3251 // zsize 0 0 0 0 4 0 4 | |
3252 if (next_full_store < 0) { | |
3253 // Conservative tack: Zero to end of current word. | |
3254 zeroes_needed = align_size_up(zeroes_needed, BytesPerInt); | |
3255 } else { | |
3256 // Zero to beginning of next fully initialized word. | |
3257 // Or, don't zero at all, if we are already in that word. | |
3258 assert(next_full_store >= zeroes_needed, "must go forward"); | |
3259 assert((next_full_store & (BytesPerInt-1)) == 0, "even boundary"); | |
3260 zeroes_needed = next_full_store; | |
3261 } | |
3262 } | |
3263 | |
3264 if (zeroes_needed > zeroes_done) { | |
3265 intptr_t zsize = zeroes_needed - zeroes_done; | |
3266 // Do some incremental zeroing on rawmem, in parallel with inits. | |
3267 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3268 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3269 zeroes_done, zeroes_needed, | |
3270 phase); | |
3271 zeroes_done = zeroes_needed; | |
3272 if (zsize > Matcher::init_array_short_size && ++big_init_gaps > 2) | |
3273 do_zeroing = false; // leave the hole, next time | |
3274 } | |
3275 } | |
3276 | |
3277 // Collect the store and move on: | |
3278 st->set_req(MemNode::Memory, inits); | |
3279 inits = st; // put it on the linearized chain | |
3280 set_req(i, zmem); // unhook from previous position | |
3281 | |
3282 if (zeroes_done == st_off) | |
3283 zeroes_done = next_init_off; | |
3284 | |
3285 assert(!do_zeroing || zeroes_done >= next_init_off, "don't miss any"); | |
3286 | |
3287 #ifdef ASSERT | |
3288 // Various order invariants. Weaker than stores_are_sane because | |
3289 // a large constant tile can be filled in by smaller non-constant stores. | |
3290 assert(st_off >= last_init_off, "inits do not reverse"); | |
3291 last_init_off = st_off; | |
3292 const Type* val = NULL; | |
3293 if (st_size >= BytesPerInt && | |
3294 (val = phase->type(st->in(MemNode::ValueIn)))->singleton() && | |
3295 (int)val->basic_type() < (int)T_OBJECT) { | |
3296 assert(st_off >= last_tile_end, "tiles do not overlap"); | |
3297 assert(st_off >= last_init_end, "tiles do not overwrite inits"); | |
3298 last_tile_end = MAX2(last_tile_end, next_init_off); | |
3299 } else { | |
3300 intptr_t st_tile_end = align_size_up(next_init_off, BytesPerLong); | |
3301 assert(st_tile_end >= last_tile_end, "inits stay with tiles"); | |
3302 assert(st_off >= last_init_end, "inits do not overlap"); | |
3303 last_init_end = next_init_off; // it's a non-tile | |
3304 } | |
3305 #endif //ASSERT | |
3306 } | |
3307 | |
3308 remove_extra_zeroes(); // clear out all the zmems left over | |
3309 add_req(inits); | |
3310 | |
3311 if (!ZeroTLAB) { | |
3312 // If anything remains to be zeroed, zero it all now. | |
3313 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
3314 // if it is the last unused 4 bytes of an instance, forget about it | |
3315 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint); | |
3316 if (zeroes_done + BytesPerLong >= size_limit) { | |
3317 assert(allocation() != NULL, ""); | |
3318 Node* klass_node = allocation()->in(AllocateNode::KlassNode); | |
3319 ciKlass* k = phase->type(klass_node)->is_klassptr()->klass(); | |
3320 if (zeroes_done == k->layout_helper()) | |
3321 zeroes_done = size_limit; | |
3322 } | |
3323 if (zeroes_done < size_limit) { | |
3324 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
3325 zeroes_done, size_in_bytes, phase); | |
3326 } | |
3327 } | |
3328 | |
3329 set_complete(phase); | |
3330 return rawmem; | |
3331 } | |
3332 | |
3333 | |
3334 #ifdef ASSERT | |
3335 bool InitializeNode::stores_are_sane(PhaseTransform* phase) { | |
3336 if (is_complete()) | |
3337 return true; // stores could be anything at this point | |
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3338 assert(allocation() != NULL, "must be present"); |
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3339 intptr_t last_off = allocation()->minimum_header_size(); |
0 | 3340 for (uint i = InitializeNode::RawStores; i < req(); i++) { |
3341 Node* st = in(i); | |
3342 intptr_t st_off = get_store_offset(st, phase); | |
3343 if (st_off < 0) continue; // ignore dead garbage | |
3344 if (last_off > st_off) { | |
3345 tty->print_cr("*** bad store offset at %d: %d > %d", i, last_off, st_off); | |
3346 this->dump(2); | |
3347 assert(false, "ascending store offsets"); | |
3348 return false; | |
3349 } | |
3350 last_off = st_off + st->as_Store()->memory_size(); | |
3351 } | |
3352 return true; | |
3353 } | |
3354 #endif //ASSERT | |
3355 | |
3356 | |
3357 | |
3358 | |
3359 //============================MergeMemNode===================================== | |
3360 // | |
3361 // SEMANTICS OF MEMORY MERGES: A MergeMem is a memory state assembled from several | |
3362 // contributing store or call operations. Each contributor provides the memory | |
3363 // state for a particular "alias type" (see Compile::alias_type). For example, | |
3364 // if a MergeMem has an input X for alias category #6, then any memory reference | |
3365 // to alias category #6 may use X as its memory state input, as an exact equivalent | |
3366 // to using the MergeMem as a whole. | |
3367 // Load<6>( MergeMem(<6>: X, ...), p ) <==> Load<6>(X,p) | |
3368 // | |
3369 // (Here, the <N> notation gives the index of the relevant adr_type.) | |
3370 // | |
3371 // In one special case (and more cases in the future), alias categories overlap. | |
3372 // The special alias category "Bot" (Compile::AliasIdxBot) includes all memory | |
3373 // states. Therefore, if a MergeMem has only one contributing input W for Bot, | |
3374 // it is exactly equivalent to that state W: | |
3375 // MergeMem(<Bot>: W) <==> W | |
3376 // | |
3377 // Usually, the merge has more than one input. In that case, where inputs | |
3378 // overlap (i.e., one is Bot), the narrower alias type determines the memory | |
3379 // state for that type, and the wider alias type (Bot) fills in everywhere else: | |
3380 // Load<5>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<5>(W,p) | |
3381 // Load<6>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<6>(X,p) | |
3382 // | |
3383 // A merge can take a "wide" memory state as one of its narrow inputs. | |
3384 // This simply means that the merge observes out only the relevant parts of | |
3385 // the wide input. That is, wide memory states arriving at narrow merge inputs | |
3386 // are implicitly "filtered" or "sliced" as necessary. (This is rare.) | |
3387 // | |
3388 // These rules imply that MergeMem nodes may cascade (via their <Bot> links), | |
3389 // and that memory slices "leak through": | |
3390 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y)) <==> MergeMem(<Bot>: W, <7>: Y) | |
3391 // | |
3392 // But, in such a cascade, repeated memory slices can "block the leak": | |
3393 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y), <7>: Y') <==> MergeMem(<Bot>: W, <7>: Y') | |
3394 // | |
3395 // In the last example, Y is not part of the combined memory state of the | |
3396 // outermost MergeMem. The system must, of course, prevent unschedulable | |
3397 // memory states from arising, so you can be sure that the state Y is somehow | |
3398 // a precursor to state Y'. | |
3399 // | |
3400 // | |
3401 // REPRESENTATION OF MEMORY MERGES: The indexes used to address the Node::in array | |
3402 // of each MergeMemNode array are exactly the numerical alias indexes, including | |
3403 // but not limited to AliasIdxTop, AliasIdxBot, and AliasIdxRaw. The functions | |
3404 // Compile::alias_type (and kin) produce and manage these indexes. | |
3405 // | |
3406 // By convention, the value of in(AliasIdxTop) (i.e., in(1)) is always the top node. | |
3407 // (Note that this provides quick access to the top node inside MergeMem methods, | |
3408 // without the need to reach out via TLS to Compile::current.) | |
3409 // | |
3410 // As a consequence of what was just described, a MergeMem that represents a full | |
3411 // memory state has an edge in(AliasIdxBot) which is a "wide" memory state, | |
3412 // containing all alias categories. | |
3413 // | |
3414 // MergeMem nodes never (?) have control inputs, so in(0) is NULL. | |
3415 // | |
3416 // All other edges in(N) (including in(AliasIdxRaw), which is in(3)) are either | |
3417 // a memory state for the alias type <N>, or else the top node, meaning that | |
3418 // there is no particular input for that alias type. Note that the length of | |
3419 // a MergeMem is variable, and may be extended at any time to accommodate new | |
3420 // memory states at larger alias indexes. When merges grow, they are of course | |
3421 // filled with "top" in the unused in() positions. | |
3422 // | |
3423 // This use of top is named "empty_memory()", or "empty_mem" (no-memory) as a variable. | |
3424 // (Top was chosen because it works smoothly with passes like GCM.) | |
3425 // | |
3426 // For convenience, we hardwire the alias index for TypeRawPtr::BOTTOM. (It is | |
3427 // the type of random VM bits like TLS references.) Since it is always the | |
3428 // first non-Bot memory slice, some low-level loops use it to initialize an | |
3429 // index variable: for (i = AliasIdxRaw; i < req(); i++). | |
3430 // | |
3431 // | |
3432 // ACCESSORS: There is a special accessor MergeMemNode::base_memory which returns | |
3433 // the distinguished "wide" state. The accessor MergeMemNode::memory_at(N) returns | |
3434 // the memory state for alias type <N>, or (if there is no particular slice at <N>, | |
3435 // it returns the base memory. To prevent bugs, memory_at does not accept <Top> | |
3436 // or <Bot> indexes. The iterator MergeMemStream provides robust iteration over | |
3437 // MergeMem nodes or pairs of such nodes, ensuring that the non-top edges are visited. | |
3438 // | |
3439 // %%%% We may get rid of base_memory as a separate accessor at some point; it isn't | |
3440 // really that different from the other memory inputs. An abbreviation called | |
3441 // "bot_memory()" for "memory_at(AliasIdxBot)" would keep code tidy. | |
3442 // | |
3443 // | |
3444 // PARTIAL MEMORY STATES: During optimization, MergeMem nodes may arise that represent | |
3445 // partial memory states. When a Phi splits through a MergeMem, the copy of the Phi | |
3446 // that "emerges though" the base memory will be marked as excluding the alias types | |
3447 // of the other (narrow-memory) copies which "emerged through" the narrow edges: | |
3448 // | |
3449 // Phi<Bot>(U, MergeMem(<Bot>: W, <8>: Y)) | |
3450 // ==Ideal=> MergeMem(<Bot>: Phi<Bot-8>(U, W), Phi<8>(U, Y)) | |
3451 // | |
3452 // This strange "subtraction" effect is necessary to ensure IGVN convergence. | |
3453 // (It is currently unimplemented.) As you can see, the resulting merge is | |
3454 // actually a disjoint union of memory states, rather than an overlay. | |
3455 // | |
3456 | |
3457 //------------------------------MergeMemNode----------------------------------- | |
3458 Node* MergeMemNode::make_empty_memory() { | |
3459 Node* empty_memory = (Node*) Compile::current()->top(); | |
3460 assert(empty_memory->is_top(), "correct sentinel identity"); | |
3461 return empty_memory; | |
3462 } | |
3463 | |
3464 MergeMemNode::MergeMemNode(Node *new_base) : Node(1+Compile::AliasIdxRaw) { | |
3465 init_class_id(Class_MergeMem); | |
3466 // all inputs are nullified in Node::Node(int) | |
3467 // set_input(0, NULL); // no control input | |
3468 | |
3469 // Initialize the edges uniformly to top, for starters. | |
3470 Node* empty_mem = make_empty_memory(); | |
3471 for (uint i = Compile::AliasIdxTop; i < req(); i++) { | |
3472 init_req(i,empty_mem); | |
3473 } | |
3474 assert(empty_memory() == empty_mem, ""); | |
3475 | |
3476 if( new_base != NULL && new_base->is_MergeMem() ) { | |
3477 MergeMemNode* mdef = new_base->as_MergeMem(); | |
3478 assert(mdef->empty_memory() == empty_mem, "consistent sentinels"); | |
3479 for (MergeMemStream mms(this, mdef); mms.next_non_empty2(); ) { | |
3480 mms.set_memory(mms.memory2()); | |
3481 } | |
3482 assert(base_memory() == mdef->base_memory(), ""); | |
3483 } else { | |
3484 set_base_memory(new_base); | |
3485 } | |
3486 } | |
3487 | |
3488 // Make a new, untransformed MergeMem with the same base as 'mem'. | |
3489 // If mem is itself a MergeMem, populate the result with the same edges. | |
3490 MergeMemNode* MergeMemNode::make(Compile* C, Node* mem) { | |
3491 return new(C, 1+Compile::AliasIdxRaw) MergeMemNode(mem); | |
3492 } | |
3493 | |
3494 //------------------------------cmp-------------------------------------------- | |
3495 uint MergeMemNode::hash() const { return NO_HASH; } | |
3496 uint MergeMemNode::cmp( const Node &n ) const { | |
3497 return (&n == this); // Always fail except on self | |
3498 } | |
3499 | |
3500 //------------------------------Identity--------------------------------------- | |
3501 Node* MergeMemNode::Identity(PhaseTransform *phase) { | |
3502 // Identity if this merge point does not record any interesting memory | |
3503 // disambiguations. | |
3504 Node* base_mem = base_memory(); | |
3505 Node* empty_mem = empty_memory(); | |
3506 if (base_mem != empty_mem) { // Memory path is not dead? | |
3507 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3508 Node* mem = in(i); | |
3509 if (mem != empty_mem && mem != base_mem) { | |
3510 return this; // Many memory splits; no change | |
3511 } | |
3512 } | |
3513 } | |
3514 return base_mem; // No memory splits; ID on the one true input | |
3515 } | |
3516 | |
3517 //------------------------------Ideal------------------------------------------ | |
3518 // This method is invoked recursively on chains of MergeMem nodes | |
3519 Node *MergeMemNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
3520 // Remove chain'd MergeMems | |
3521 // | |
3522 // This is delicate, because the each "in(i)" (i >= Raw) is interpreted | |
3523 // relative to the "in(Bot)". Since we are patching both at the same time, | |
3524 // we have to be careful to read each "in(i)" relative to the old "in(Bot)", | |
3525 // but rewrite each "in(i)" relative to the new "in(Bot)". | |
3526 Node *progress = NULL; | |
3527 | |
3528 | |
3529 Node* old_base = base_memory(); | |
3530 Node* empty_mem = empty_memory(); | |
3531 if (old_base == empty_mem) | |
3532 return NULL; // Dead memory path. | |
3533 | |
3534 MergeMemNode* old_mbase; | |
3535 if (old_base != NULL && old_base->is_MergeMem()) | |
3536 old_mbase = old_base->as_MergeMem(); | |
3537 else | |
3538 old_mbase = NULL; | |
3539 Node* new_base = old_base; | |
3540 | |
3541 // simplify stacked MergeMems in base memory | |
3542 if (old_mbase) new_base = old_mbase->base_memory(); | |
3543 | |
3544 // the base memory might contribute new slices beyond my req() | |
3545 if (old_mbase) grow_to_match(old_mbase); | |
3546 | |
3547 // Look carefully at the base node if it is a phi. | |
3548 PhiNode* phi_base; | |
3549 if (new_base != NULL && new_base->is_Phi()) | |
3550 phi_base = new_base->as_Phi(); | |
3551 else | |
3552 phi_base = NULL; | |
3553 | |
3554 Node* phi_reg = NULL; | |
3555 uint phi_len = (uint)-1; | |
3556 if (phi_base != NULL && !phi_base->is_copy()) { | |
3557 // do not examine phi if degraded to a copy | |
3558 phi_reg = phi_base->region(); | |
3559 phi_len = phi_base->req(); | |
3560 // see if the phi is unfinished | |
3561 for (uint i = 1; i < phi_len; i++) { | |
3562 if (phi_base->in(i) == NULL) { | |
3563 // incomplete phi; do not look at it yet! | |
3564 phi_reg = NULL; | |
3565 phi_len = (uint)-1; | |
3566 break; | |
3567 } | |
3568 } | |
3569 } | |
3570 | |
3571 // Note: We do not call verify_sparse on entry, because inputs | |
3572 // can normalize to the base_memory via subsume_node or similar | |
3573 // mechanisms. This method repairs that damage. | |
3574 | |
3575 assert(!old_mbase || old_mbase->is_empty_memory(empty_mem), "consistent sentinels"); | |
3576 | |
3577 // Look at each slice. | |
3578 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3579 Node* old_in = in(i); | |
3580 // calculate the old memory value | |
3581 Node* old_mem = old_in; | |
3582 if (old_mem == empty_mem) old_mem = old_base; | |
3583 assert(old_mem == memory_at(i), ""); | |
3584 | |
3585 // maybe update (reslice) the old memory value | |
3586 | |
3587 // simplify stacked MergeMems | |
3588 Node* new_mem = old_mem; | |
3589 MergeMemNode* old_mmem; | |
3590 if (old_mem != NULL && old_mem->is_MergeMem()) | |
3591 old_mmem = old_mem->as_MergeMem(); | |
3592 else | |
3593 old_mmem = NULL; | |
3594 if (old_mmem == this) { | |
3595 // This can happen if loops break up and safepoints disappear. | |
3596 // A merge of BotPtr (default) with a RawPtr memory derived from a | |
3597 // safepoint can be rewritten to a merge of the same BotPtr with | |
3598 // the BotPtr phi coming into the loop. If that phi disappears | |
3599 // also, we can end up with a self-loop of the mergemem. | |
3600 // In general, if loops degenerate and memory effects disappear, | |
3601 // a mergemem can be left looking at itself. This simply means | |
3602 // that the mergemem's default should be used, since there is | |
3603 // no longer any apparent effect on this slice. | |
3604 // Note: If a memory slice is a MergeMem cycle, it is unreachable | |
3605 // from start. Update the input to TOP. | |
3606 new_mem = (new_base == this || new_base == empty_mem)? empty_mem : new_base; | |
3607 } | |
3608 else if (old_mmem != NULL) { | |
3609 new_mem = old_mmem->memory_at(i); | |
3610 } | |
3611 // else preceeding memory was not a MergeMem | |
3612 | |
3613 // replace equivalent phis (unfortunately, they do not GVN together) | |
3614 if (new_mem != NULL && new_mem != new_base && | |
3615 new_mem->req() == phi_len && new_mem->in(0) == phi_reg) { | |
3616 if (new_mem->is_Phi()) { | |
3617 PhiNode* phi_mem = new_mem->as_Phi(); | |
3618 for (uint i = 1; i < phi_len; i++) { | |
3619 if (phi_base->in(i) != phi_mem->in(i)) { | |
3620 phi_mem = NULL; | |
3621 break; | |
3622 } | |
3623 } | |
3624 if (phi_mem != NULL) { | |
3625 // equivalent phi nodes; revert to the def | |
3626 new_mem = new_base; | |
3627 } | |
3628 } | |
3629 } | |
3630 | |
3631 // maybe store down a new value | |
3632 Node* new_in = new_mem; | |
3633 if (new_in == new_base) new_in = empty_mem; | |
3634 | |
3635 if (new_in != old_in) { | |
3636 // Warning: Do not combine this "if" with the previous "if" | |
3637 // A memory slice might have be be rewritten even if it is semantically | |
3638 // unchanged, if the base_memory value has changed. | |
3639 set_req(i, new_in); | |
3640 progress = this; // Report progress | |
3641 } | |
3642 } | |
3643 | |
3644 if (new_base != old_base) { | |
3645 set_req(Compile::AliasIdxBot, new_base); | |
3646 // Don't use set_base_memory(new_base), because we need to update du. | |
3647 assert(base_memory() == new_base, ""); | |
3648 progress = this; | |
3649 } | |
3650 | |
3651 if( base_memory() == this ) { | |
3652 // a self cycle indicates this memory path is dead | |
3653 set_req(Compile::AliasIdxBot, empty_mem); | |
3654 } | |
3655 | |
3656 // Resolve external cycles by calling Ideal on a MergeMem base_memory | |
3657 // Recursion must occur after the self cycle check above | |
3658 if( base_memory()->is_MergeMem() ) { | |
3659 MergeMemNode *new_mbase = base_memory()->as_MergeMem(); | |
3660 Node *m = phase->transform(new_mbase); // Rollup any cycles | |
3661 if( m != NULL && (m->is_top() || | |
3662 m->is_MergeMem() && m->as_MergeMem()->base_memory() == empty_mem) ) { | |
3663 // propagate rollup of dead cycle to self | |
3664 set_req(Compile::AliasIdxBot, empty_mem); | |
3665 } | |
3666 } | |
3667 | |
3668 if( base_memory() == empty_mem ) { | |
3669 progress = this; | |
3670 // Cut inputs during Parse phase only. | |
3671 // During Optimize phase a dead MergeMem node will be subsumed by Top. | |
3672 if( !can_reshape ) { | |
3673 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3674 if( in(i) != empty_mem ) { set_req(i, empty_mem); } | |
3675 } | |
3676 } | |
3677 } | |
3678 | |
3679 if( !progress && base_memory()->is_Phi() && can_reshape ) { | |
3680 // Check if PhiNode::Ideal's "Split phis through memory merges" | |
3681 // transform should be attempted. Look for this->phi->this cycle. | |
3682 uint merge_width = req(); | |
3683 if (merge_width > Compile::AliasIdxRaw) { | |
3684 PhiNode* phi = base_memory()->as_Phi(); | |
3685 for( uint i = 1; i < phi->req(); ++i ) {// For all paths in | |
3686 if (phi->in(i) == this) { | |
3687 phase->is_IterGVN()->_worklist.push(phi); | |
3688 break; | |
3689 } | |
3690 } | |
3691 } | |
3692 } | |
3693 | |
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3694 assert(progress || verify_sparse(), "please, no dups of base"); |
0 | 3695 return progress; |
3696 } | |
3697 | |
3698 //-------------------------set_base_memory------------------------------------- | |
3699 void MergeMemNode::set_base_memory(Node *new_base) { | |
3700 Node* empty_mem = empty_memory(); | |
3701 set_req(Compile::AliasIdxBot, new_base); | |
3702 assert(memory_at(req()) == new_base, "must set default memory"); | |
3703 // Clear out other occurrences of new_base: | |
3704 if (new_base != empty_mem) { | |
3705 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3706 if (in(i) == new_base) set_req(i, empty_mem); | |
3707 } | |
3708 } | |
3709 } | |
3710 | |
3711 //------------------------------out_RegMask------------------------------------ | |
3712 const RegMask &MergeMemNode::out_RegMask() const { | |
3713 return RegMask::Empty; | |
3714 } | |
3715 | |
3716 //------------------------------dump_spec-------------------------------------- | |
3717 #ifndef PRODUCT | |
3718 void MergeMemNode::dump_spec(outputStream *st) const { | |
3719 st->print(" {"); | |
3720 Node* base_mem = base_memory(); | |
3721 for( uint i = Compile::AliasIdxRaw; i < req(); i++ ) { | |
3722 Node* mem = memory_at(i); | |
3723 if (mem == base_mem) { st->print(" -"); continue; } | |
3724 st->print( " N%d:", mem->_idx ); | |
3725 Compile::current()->get_adr_type(i)->dump_on(st); | |
3726 } | |
3727 st->print(" }"); | |
3728 } | |
3729 #endif // !PRODUCT | |
3730 | |
3731 | |
3732 #ifdef ASSERT | |
3733 static bool might_be_same(Node* a, Node* b) { | |
3734 if (a == b) return true; | |
3735 if (!(a->is_Phi() || b->is_Phi())) return false; | |
3736 // phis shift around during optimization | |
3737 return true; // pretty stupid... | |
3738 } | |
3739 | |
3740 // verify a narrow slice (either incoming or outgoing) | |
3741 static void verify_memory_slice(const MergeMemNode* m, int alias_idx, Node* n) { | |
3742 if (!VerifyAliases) return; // don't bother to verify unless requested | |
3743 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
3744 if (Node::in_dump()) return; // muzzle asserts when printing | |
3745 assert(alias_idx >= Compile::AliasIdxRaw, "must not disturb base_memory or sentinel"); | |
3746 assert(n != NULL, ""); | |
3747 // Elide intervening MergeMem's | |
3748 while (n->is_MergeMem()) { | |
3749 n = n->as_MergeMem()->memory_at(alias_idx); | |
3750 } | |
3751 Compile* C = Compile::current(); | |
3752 const TypePtr* n_adr_type = n->adr_type(); | |
3753 if (n == m->empty_memory()) { | |
3754 // Implicit copy of base_memory() | |
3755 } else if (n_adr_type != TypePtr::BOTTOM) { | |
3756 assert(n_adr_type != NULL, "new memory must have a well-defined adr_type"); | |
3757 assert(C->must_alias(n_adr_type, alias_idx), "new memory must match selected slice"); | |
3758 } else { | |
3759 // A few places like make_runtime_call "know" that VM calls are narrow, | |
3760 // and can be used to update only the VM bits stored as TypeRawPtr::BOTTOM. | |
3761 bool expected_wide_mem = false; | |
3762 if (n == m->base_memory()) { | |
3763 expected_wide_mem = true; | |
3764 } else if (alias_idx == Compile::AliasIdxRaw || | |
3765 n == m->memory_at(Compile::AliasIdxRaw)) { | |
3766 expected_wide_mem = true; | |
3767 } else if (!C->alias_type(alias_idx)->is_rewritable()) { | |
3768 // memory can "leak through" calls on channels that | |
3769 // are write-once. Allow this also. | |
3770 expected_wide_mem = true; | |
3771 } | |
3772 assert(expected_wide_mem, "expected narrow slice replacement"); | |
3773 } | |
3774 } | |
3775 #else // !ASSERT | |
3776 #define verify_memory_slice(m,i,n) (0) // PRODUCT version is no-op | |
3777 #endif | |
3778 | |
3779 | |
3780 //-----------------------------memory_at--------------------------------------- | |
3781 Node* MergeMemNode::memory_at(uint alias_idx) const { | |
3782 assert(alias_idx >= Compile::AliasIdxRaw || | |
3783 alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, | |
3784 "must avoid base_memory and AliasIdxTop"); | |
3785 | |
3786 // Otherwise, it is a narrow slice. | |
3787 Node* n = alias_idx < req() ? in(alias_idx) : empty_memory(); | |
3788 Compile *C = Compile::current(); | |
3789 if (is_empty_memory(n)) { | |
3790 // the array is sparse; empty slots are the "top" node | |
3791 n = base_memory(); | |
3792 assert(Node::in_dump() | |
3793 || n == NULL || n->bottom_type() == Type::TOP | |
3794 || n->adr_type() == TypePtr::BOTTOM | |
3795 || n->adr_type() == TypeRawPtr::BOTTOM | |
3796 || Compile::current()->AliasLevel() == 0, | |
3797 "must be a wide memory"); | |
3798 // AliasLevel == 0 if we are organizing the memory states manually. | |
3799 // See verify_memory_slice for comments on TypeRawPtr::BOTTOM. | |
3800 } else { | |
3801 // make sure the stored slice is sane | |
3802 #ifdef ASSERT | |
3803 if (is_error_reported() || Node::in_dump()) { | |
3804 } else if (might_be_same(n, base_memory())) { | |
3805 // Give it a pass: It is a mostly harmless repetition of the base. | |
3806 // This can arise normally from node subsumption during optimization. | |
3807 } else { | |
3808 verify_memory_slice(this, alias_idx, n); | |
3809 } | |
3810 #endif | |
3811 } | |
3812 return n; | |
3813 } | |
3814 | |
3815 //---------------------------set_memory_at------------------------------------- | |
3816 void MergeMemNode::set_memory_at(uint alias_idx, Node *n) { | |
3817 verify_memory_slice(this, alias_idx, n); | |
3818 Node* empty_mem = empty_memory(); | |
3819 if (n == base_memory()) n = empty_mem; // collapse default | |
3820 uint need_req = alias_idx+1; | |
3821 if (req() < need_req) { | |
3822 if (n == empty_mem) return; // already the default, so do not grow me | |
3823 // grow the sparse array | |
3824 do { | |
3825 add_req(empty_mem); | |
3826 } while (req() < need_req); | |
3827 } | |
3828 set_req( alias_idx, n ); | |
3829 } | |
3830 | |
3831 | |
3832 | |
3833 //--------------------------iteration_setup------------------------------------ | |
3834 void MergeMemNode::iteration_setup(const MergeMemNode* other) { | |
3835 if (other != NULL) { | |
3836 grow_to_match(other); | |
3837 // invariant: the finite support of mm2 is within mm->req() | |
3838 #ifdef ASSERT | |
3839 for (uint i = req(); i < other->req(); i++) { | |
3840 assert(other->is_empty_memory(other->in(i)), "slice left uncovered"); | |
3841 } | |
3842 #endif | |
3843 } | |
3844 // Replace spurious copies of base_memory by top. | |
3845 Node* base_mem = base_memory(); | |
3846 if (base_mem != NULL && !base_mem->is_top()) { | |
3847 for (uint i = Compile::AliasIdxBot+1, imax = req(); i < imax; i++) { | |
3848 if (in(i) == base_mem) | |
3849 set_req(i, empty_memory()); | |
3850 } | |
3851 } | |
3852 } | |
3853 | |
3854 //---------------------------grow_to_match------------------------------------- | |
3855 void MergeMemNode::grow_to_match(const MergeMemNode* other) { | |
3856 Node* empty_mem = empty_memory(); | |
3857 assert(other->is_empty_memory(empty_mem), "consistent sentinels"); | |
3858 // look for the finite support of the other memory | |
3859 for (uint i = other->req(); --i >= req(); ) { | |
3860 if (other->in(i) != empty_mem) { | |
3861 uint new_len = i+1; | |
3862 while (req() < new_len) add_req(empty_mem); | |
3863 break; | |
3864 } | |
3865 } | |
3866 } | |
3867 | |
3868 //---------------------------verify_sparse------------------------------------- | |
3869 #ifndef PRODUCT | |
3870 bool MergeMemNode::verify_sparse() const { | |
3871 assert(is_empty_memory(make_empty_memory()), "sane sentinel"); | |
3872 Node* base_mem = base_memory(); | |
3873 // The following can happen in degenerate cases, since empty==top. | |
3874 if (is_empty_memory(base_mem)) return true; | |
3875 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3876 assert(in(i) != NULL, "sane slice"); | |
3877 if (in(i) == base_mem) return false; // should have been the sentinel value! | |
3878 } | |
3879 return true; | |
3880 } | |
3881 | |
3882 bool MergeMemStream::match_memory(Node* mem, const MergeMemNode* mm, int idx) { | |
3883 Node* n; | |
3884 n = mm->in(idx); | |
3885 if (mem == n) return true; // might be empty_memory() | |
3886 n = (idx == Compile::AliasIdxBot)? mm->base_memory(): mm->memory_at(idx); | |
3887 if (mem == n) return true; | |
3888 while (n->is_Phi() && (n = n->as_Phi()->is_copy()) != NULL) { | |
3889 if (mem == n) return true; | |
3890 if (n == NULL) break; | |
3891 } | |
3892 return false; | |
3893 } | |
3894 #endif // !PRODUCT |