Mercurial > hg > truffle
annotate src/share/vm/opto/macro.cpp @ 10772:dfc4b73e79e8
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author | twisti |
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date | Fri, 12 Jul 2013 10:12:06 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "compiler/compileLog.hpp" | |
27 #include "libadt/vectset.hpp" | |
28 #include "opto/addnode.hpp" | |
29 #include "opto/callnode.hpp" | |
30 #include "opto/cfgnode.hpp" | |
31 #include "opto/compile.hpp" | |
32 #include "opto/connode.hpp" | |
33 #include "opto/locknode.hpp" | |
34 #include "opto/loopnode.hpp" | |
35 #include "opto/macro.hpp" | |
36 #include "opto/memnode.hpp" | |
37 #include "opto/node.hpp" | |
38 #include "opto/phaseX.hpp" | |
39 #include "opto/rootnode.hpp" | |
40 #include "opto/runtime.hpp" | |
41 #include "opto/subnode.hpp" | |
42 #include "opto/type.hpp" | |
43 #include "runtime/sharedRuntime.hpp" | |
0 | 44 |
45 | |
46 // | |
47 // Replace any references to "oldref" in inputs to "use" with "newref". | |
48 // Returns the number of replacements made. | |
49 // | |
50 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) { | |
51 int nreplacements = 0; | |
52 uint req = use->req(); | |
53 for (uint j = 0; j < use->len(); j++) { | |
54 Node *uin = use->in(j); | |
55 if (uin == oldref) { | |
56 if (j < req) | |
57 use->set_req(j, newref); | |
58 else | |
59 use->set_prec(j, newref); | |
60 nreplacements++; | |
61 } else if (j >= req && uin == NULL) { | |
62 break; | |
63 } | |
64 } | |
65 return nreplacements; | |
66 } | |
67 | |
68 void PhaseMacroExpand::copy_call_debug_info(CallNode *oldcall, CallNode * newcall) { | |
69 // Copy debug information and adjust JVMState information | |
70 uint old_dbg_start = oldcall->tf()->domain()->cnt(); | |
71 uint new_dbg_start = newcall->tf()->domain()->cnt(); | |
72 int jvms_adj = new_dbg_start - old_dbg_start; | |
73 assert (new_dbg_start == newcall->req(), "argument count mismatch"); | |
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74 |
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75 Dict* sosn_map = new Dict(cmpkey,hashkey); |
0 | 76 for (uint i = old_dbg_start; i < oldcall->req(); i++) { |
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77 Node* old_in = oldcall->in(i); |
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78 // Clone old SafePointScalarObjectNodes, adjusting their field contents. |
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79 if (old_in != NULL && old_in->is_SafePointScalarObject()) { |
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80 SafePointScalarObjectNode* old_sosn = old_in->as_SafePointScalarObject(); |
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81 uint old_unique = C->unique(); |
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82 Node* new_in = old_sosn->clone(jvms_adj, sosn_map); |
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83 if (old_unique != C->unique()) { |
4115 | 84 new_in->set_req(0, C->root()); // reset control edge |
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85 new_in = transform_later(new_in); // Register new node. |
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86 } |
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87 old_in = new_in; |
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88 } |
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89 newcall->add_req(old_in); |
0 | 90 } |
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91 |
0 | 92 newcall->set_jvms(oldcall->jvms()); |
93 for (JVMState *jvms = newcall->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
94 jvms->set_map(newcall); | |
95 jvms->set_locoff(jvms->locoff()+jvms_adj); | |
96 jvms->set_stkoff(jvms->stkoff()+jvms_adj); | |
97 jvms->set_monoff(jvms->monoff()+jvms_adj); | |
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98 jvms->set_scloff(jvms->scloff()+jvms_adj); |
0 | 99 jvms->set_endoff(jvms->endoff()+jvms_adj); |
100 } | |
101 } | |
102 | |
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103 Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word, int mask, int bits, bool return_fast_path) { |
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104 Node* cmp; |
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105 if (mask != 0) { |
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106 Node* and_node = transform_later(new (C) AndXNode(word, MakeConX(mask))); |
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107 cmp = transform_later(new (C) CmpXNode(and_node, MakeConX(bits))); |
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108 } else { |
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109 cmp = word; |
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110 } |
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111 Node* bol = transform_later(new (C) BoolNode(cmp, BoolTest::ne)); |
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112 IfNode* iff = new (C) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN ); |
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113 transform_later(iff); |
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115 // Fast path taken. |
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116 Node *fast_taken = transform_later( new (C) IfFalseNode(iff) ); |
0 | 117 |
118 // Fast path not-taken, i.e. slow path | |
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119 Node *slow_taken = transform_later( new (C) IfTrueNode(iff) ); |
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120 |
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121 if (return_fast_path) { |
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122 region->init_req(edge, slow_taken); // Capture slow-control |
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123 return fast_taken; |
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124 } else { |
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125 region->init_req(edge, fast_taken); // Capture fast-control |
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126 return slow_taken; |
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127 } |
0 | 128 } |
129 | |
130 //--------------------copy_predefined_input_for_runtime_call-------------------- | |
131 void PhaseMacroExpand::copy_predefined_input_for_runtime_call(Node * ctrl, CallNode* oldcall, CallNode* call) { | |
132 // Set fixed predefined input arguments | |
133 call->init_req( TypeFunc::Control, ctrl ); | |
134 call->init_req( TypeFunc::I_O , oldcall->in( TypeFunc::I_O) ); | |
135 call->init_req( TypeFunc::Memory , oldcall->in( TypeFunc::Memory ) ); // ????? | |
136 call->init_req( TypeFunc::ReturnAdr, oldcall->in( TypeFunc::ReturnAdr ) ); | |
137 call->init_req( TypeFunc::FramePtr, oldcall->in( TypeFunc::FramePtr ) ); | |
138 } | |
139 | |
140 //------------------------------make_slow_call--------------------------------- | |
141 CallNode* PhaseMacroExpand::make_slow_call(CallNode *oldcall, const TypeFunc* slow_call_type, address slow_call, const char* leaf_name, Node* slow_path, Node* parm0, Node* parm1) { | |
142 | |
143 // Slow-path call | |
144 CallNode *call = leaf_name | |
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145 ? (CallNode*)new (C) CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM ) |
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146 : (CallNode*)new (C) CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), oldcall->jvms()->bci(), TypeRawPtr::BOTTOM ); |
0 | 147 |
148 // Slow path call has no side-effects, uses few values | |
149 copy_predefined_input_for_runtime_call(slow_path, oldcall, call ); | |
150 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0); | |
151 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1); | |
152 copy_call_debug_info(oldcall, call); | |
153 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
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154 _igvn.replace_node(oldcall, call); |
0 | 155 transform_later(call); |
156 | |
157 return call; | |
158 } | |
159 | |
160 void PhaseMacroExpand::extract_call_projections(CallNode *call) { | |
161 _fallthroughproj = NULL; | |
162 _fallthroughcatchproj = NULL; | |
163 _ioproj_fallthrough = NULL; | |
164 _ioproj_catchall = NULL; | |
165 _catchallcatchproj = NULL; | |
166 _memproj_fallthrough = NULL; | |
167 _memproj_catchall = NULL; | |
168 _resproj = NULL; | |
169 for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) { | |
170 ProjNode *pn = call->fast_out(i)->as_Proj(); | |
171 switch (pn->_con) { | |
172 case TypeFunc::Control: | |
173 { | |
174 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj | |
175 _fallthroughproj = pn; | |
176 DUIterator_Fast jmax, j = pn->fast_outs(jmax); | |
177 const Node *cn = pn->fast_out(j); | |
178 if (cn->is_Catch()) { | |
179 ProjNode *cpn = NULL; | |
180 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) { | |
181 cpn = cn->fast_out(k)->as_Proj(); | |
182 assert(cpn->is_CatchProj(), "must be a CatchProjNode"); | |
183 if (cpn->_con == CatchProjNode::fall_through_index) | |
184 _fallthroughcatchproj = cpn; | |
185 else { | |
186 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index."); | |
187 _catchallcatchproj = cpn; | |
188 } | |
189 } | |
190 } | |
191 break; | |
192 } | |
193 case TypeFunc::I_O: | |
194 if (pn->_is_io_use) | |
195 _ioproj_catchall = pn; | |
196 else | |
197 _ioproj_fallthrough = pn; | |
198 break; | |
199 case TypeFunc::Memory: | |
200 if (pn->_is_io_use) | |
201 _memproj_catchall = pn; | |
202 else | |
203 _memproj_fallthrough = pn; | |
204 break; | |
205 case TypeFunc::Parms: | |
206 _resproj = pn; | |
207 break; | |
208 default: | |
209 assert(false, "unexpected projection from allocation node."); | |
210 } | |
211 } | |
212 | |
213 } | |
214 | |
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215 // Eliminate a card mark sequence. p2x is a ConvP2XNode |
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216 void PhaseMacroExpand::eliminate_card_mark(Node* p2x) { |
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217 assert(p2x->Opcode() == Op_CastP2X, "ConvP2XNode required"); |
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218 if (!UseG1GC) { |
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219 // vanilla/CMS post barrier |
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220 Node *shift = p2x->unique_out(); |
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221 Node *addp = shift->unique_out(); |
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222 for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) { |
3282 | 223 Node *mem = addp->last_out(j); |
224 if (UseCondCardMark && mem->is_Load()) { | |
225 assert(mem->Opcode() == Op_LoadB, "unexpected code shape"); | |
226 // The load is checking if the card has been written so | |
227 // replace it with zero to fold the test. | |
228 _igvn.replace_node(mem, intcon(0)); | |
229 continue; | |
230 } | |
231 assert(mem->is_Store(), "store required"); | |
232 _igvn.replace_node(mem, mem->in(MemNode::Memory)); | |
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233 } |
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234 } else { |
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235 // G1 pre/post barriers |
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236 assert(p2x->outcnt() <= 2, "expects 1 or 2 users: Xor and URShift nodes"); |
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237 // It could be only one user, URShift node, in Object.clone() instrinsic |
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238 // but the new allocation is passed to arraycopy stub and it could not |
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239 // be scalar replaced. So we don't check the case. |
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240 |
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241 // An other case of only one user (Xor) is when the value check for NULL |
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242 // in G1 post barrier is folded after CCP so the code which used URShift |
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243 // is removed. |
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244 |
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245 // Take Region node before eliminating post barrier since it also |
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246 // eliminates CastP2X node when it has only one user. |
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247 Node* this_region = p2x->in(0); |
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248 assert(this_region != NULL, ""); |
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249 |
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250 // Remove G1 post barrier. |
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251 |
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252 // Search for CastP2X->Xor->URShift->Cmp path which |
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253 // checks if the store done to a different from the value's region. |
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254 // And replace Cmp with #0 (false) to collapse G1 post barrier. |
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255 Node* xorx = NULL; |
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256 for (DUIterator_Fast imax, i = p2x->fast_outs(imax); i < imax; i++) { |
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257 Node* u = p2x->fast_out(i); |
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258 if (u->Opcode() == Op_XorX) { |
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259 xorx = u; |
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260 break; |
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261 } |
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262 } |
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263 assert(xorx != NULL, "missing G1 post barrier"); |
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264 Node* shift = xorx->unique_out(); |
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265 Node* cmpx = shift->unique_out(); |
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266 assert(cmpx->is_Cmp() && cmpx->unique_out()->is_Bool() && |
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267 cmpx->unique_out()->as_Bool()->_test._test == BoolTest::ne, |
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268 "missing region check in G1 post barrier"); |
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269 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ)); |
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270 |
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271 // Remove G1 pre barrier. |
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272 |
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273 // Search "if (marking != 0)" check and set it to "false". |
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274 // There is no G1 pre barrier if previous stored value is NULL |
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275 // (for example, after initialization). |
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276 if (this_region->is_Region() && this_region->req() == 3) { |
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277 int ind = 1; |
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278 if (!this_region->in(ind)->is_IfFalse()) { |
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279 ind = 2; |
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280 } |
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281 if (this_region->in(ind)->is_IfFalse()) { |
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282 Node* bol = this_region->in(ind)->in(0)->in(1); |
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283 assert(bol->is_Bool(), ""); |
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284 cmpx = bol->in(1); |
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285 if (bol->as_Bool()->_test._test == BoolTest::ne && |
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286 cmpx->is_Cmp() && cmpx->in(2) == intcon(0) && |
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287 cmpx->in(1)->is_Load()) { |
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288 Node* adr = cmpx->in(1)->as_Load()->in(MemNode::Address); |
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289 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + |
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290 PtrQueue::byte_offset_of_active()); |
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291 if (adr->is_AddP() && adr->in(AddPNode::Base) == top() && |
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292 adr->in(AddPNode::Address)->Opcode() == Op_ThreadLocal && |
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293 adr->in(AddPNode::Offset) == MakeConX(marking_offset)) { |
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294 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ)); |
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295 } |
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296 } |
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297 } |
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298 } |
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299 // Now CastP2X can be removed since it is used only on dead path |
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300 // which currently still alive until igvn optimize it. |
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301 assert(p2x->outcnt() == 0 || p2x->unique_out()->Opcode() == Op_URShiftX, ""); |
851
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302 _igvn.replace_node(p2x, top()); |
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303 } |
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304 } |
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305 |
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306 // Search for a memory operation for the specified memory slice. |
253
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307 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) { |
73
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308 Node *orig_mem = mem; |
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309 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
253
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310 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr(); |
73
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311 while (true) { |
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312 if (mem == alloc_mem || mem == start_mem ) { |
605 | 313 return mem; // hit one of our sentinels |
73
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314 } else if (mem->is_MergeMem()) { |
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315 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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316 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) { |
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317 Node *in = mem->in(0); |
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318 // we can safely skip over safepoints, calls, locks and membars because we |
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319 // already know that the object is safe to eliminate. |
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320 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) { |
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321 return in; |
253
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322 } else if (in->is_Call()) { |
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323 CallNode *call = in->as_Call(); |
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324 if (!call->may_modify(tinst, phase)) { |
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325 mem = call->in(TypeFunc::Memory); |
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326 } |
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327 mem = in->in(TypeFunc::Memory); |
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328 } else if (in->is_MemBar()) { |
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329 mem = in->in(TypeFunc::Memory); |
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330 } else { |
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331 assert(false, "unexpected projection"); |
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332 } |
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333 } else if (mem->is_Store()) { |
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334 const TypePtr* atype = mem->as_Store()->adr_type(); |
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335 int adr_idx = Compile::current()->get_alias_index(atype); |
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336 if (adr_idx == alias_idx) { |
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337 assert(atype->isa_oopptr(), "address type must be oopptr"); |
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338 int adr_offset = atype->offset(); |
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339 uint adr_iid = atype->is_oopptr()->instance_id(); |
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340 // Array elements references have the same alias_idx |
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341 // but different offset and different instance_id. |
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342 if (adr_offset == offset && adr_iid == alloc->_idx) |
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343 return mem; |
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344 } else { |
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345 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw"); |
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346 } |
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347 mem = mem->in(MemNode::Memory); |
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348 } else if (mem->is_ClearArray()) { |
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349 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) { |
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350 // Can not bypass initialization of the instance |
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351 // we are looking. |
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352 debug_only(intptr_t offset;) |
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353 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity"); |
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354 InitializeNode* init = alloc->as_Allocate()->initialization(); |
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355 // We are looking for stored value, return Initialize node |
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356 // or memory edge from Allocate node. |
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357 if (init != NULL) |
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358 return init; |
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359 else |
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360 return alloc->in(TypeFunc::Memory); // It will produce zero value (see callers). |
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361 } |
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362 // Otherwise skip it (the call updated 'mem' value). |
584 | 363 } else if (mem->Opcode() == Op_SCMemProj) { |
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364 mem = mem->in(0); |
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365 Node* adr = NULL; |
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366 if (mem->is_LoadStore()) { |
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367 adr = mem->in(MemNode::Address); |
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368 } else { |
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369 assert(mem->Opcode() == Op_EncodeISOArray, "sanity"); |
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370 adr = mem->in(3); // Destination array |
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371 } |
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372 const TypePtr* atype = adr->bottom_type()->is_ptr(); |
584 | 373 int adr_idx = Compile::current()->get_alias_index(atype); |
374 if (adr_idx == alias_idx) { | |
375 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); | |
376 return NULL; | |
377 } | |
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378 mem = mem->in(MemNode::Memory); |
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379 } else { |
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380 return mem; |
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381 } |
247 | 382 assert(mem != orig_mem, "dead memory loop"); |
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383 } |
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384 } |
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385 |
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386 // |
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387 // Given a Memory Phi, compute a value Phi containing the values from stores |
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388 // on the input paths. |
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389 // Note: this function is recursive, its depth is limied by the "level" argument |
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390 // Returns the computed Phi, or NULL if it cannot compute it. |
247 | 391 Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *phi_type, const TypeOopPtr *adr_t, Node *alloc, Node_Stack *value_phis, int level) { |
392 assert(mem->is_Phi(), "sanity"); | |
393 int alias_idx = C->get_alias_index(adr_t); | |
394 int offset = adr_t->offset(); | |
395 int instance_id = adr_t->instance_id(); | |
396 | |
397 // Check if an appropriate value phi already exists. | |
398 Node* region = mem->in(0); | |
399 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) { | |
400 Node* phi = region->fast_out(k); | |
401 if (phi->is_Phi() && phi != mem && | |
402 phi->as_Phi()->is_same_inst_field(phi_type, instance_id, alias_idx, offset)) { | |
403 return phi; | |
404 } | |
405 } | |
406 // Check if an appropriate new value phi already exists. | |
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407 Node* new_phi = value_phis->find(mem->_idx); |
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408 if (new_phi != NULL) |
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409 return new_phi; |
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410 |
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411 if (level <= 0) { |
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412 return NULL; // Give up: phi tree too deep |
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413 } |
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414 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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415 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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416 |
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417 uint length = mem->req(); |
6197 | 418 GrowableArray <Node *> values(length, length, NULL, false); |
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419 |
247 | 420 // create a new Phi for the value |
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421 PhiNode *phi = new (C) PhiNode(mem->in(0), phi_type, NULL, instance_id, alias_idx, offset); |
247 | 422 transform_later(phi); |
423 value_phis->push(phi, mem->_idx); | |
424 | |
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425 for (uint j = 1; j < length; j++) { |
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426 Node *in = mem->in(j); |
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427 if (in == NULL || in->is_top()) { |
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428 values.at_put(j, in); |
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429 } else { |
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430 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn); |
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431 if (val == start_mem || val == alloc_mem) { |
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432 // hit a sentinel, return appropriate 0 value |
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433 values.at_put(j, _igvn.zerocon(ft)); |
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434 continue; |
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435 } |
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436 if (val->is_Initialize()) { |
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437 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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438 } |
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439 if (val == NULL) { |
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440 return NULL; // can't find a value on this path |
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441 } |
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442 if (val == mem) { |
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443 values.at_put(j, mem); |
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444 } else if (val->is_Store()) { |
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445 values.at_put(j, val->in(MemNode::ValueIn)); |
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446 } else if(val->is_Proj() && val->in(0) == alloc) { |
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447 values.at_put(j, _igvn.zerocon(ft)); |
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448 } else if (val->is_Phi()) { |
247 | 449 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1); |
450 if (val == NULL) { | |
451 return NULL; | |
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452 } |
247 | 453 values.at_put(j, val); |
584 | 454 } else if (val->Opcode() == Op_SCMemProj) { |
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455 assert(val->in(0)->is_LoadStore() || val->in(0)->Opcode() == Op_EncodeISOArray, "sanity"); |
584 | 456 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); |
457 return NULL; | |
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458 } else { |
584 | 459 #ifdef ASSERT |
460 val->dump(); | |
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461 assert(false, "unknown node on this path"); |
584 | 462 #endif |
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463 return NULL; // unknown node on this path |
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464 } |
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465 } |
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466 } |
247 | 467 // Set Phi's inputs |
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468 for (uint j = 1; j < length; j++) { |
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469 if (values.at(j) == mem) { |
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470 phi->init_req(j, phi); |
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471 } else { |
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472 phi->init_req(j, values.at(j)); |
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473 } |
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474 } |
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475 return phi; |
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476 } |
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477 |
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478 // Search the last value stored into the object's field. |
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479 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc) { |
223 | 480 assert(adr_t->is_known_instance_field(), "instance required"); |
481 int instance_id = adr_t->instance_id(); | |
482 assert((uint)instance_id == alloc->_idx, "wrong allocation"); | |
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483 |
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484 int alias_idx = C->get_alias_index(adr_t); |
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485 int offset = adr_t->offset(); |
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486 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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487 Node *alloc_ctrl = alloc->in(TypeFunc::Control); |
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488 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
247 | 489 Arena *a = Thread::current()->resource_area(); |
490 VectorSet visited(a); | |
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491 |
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492 |
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493 bool done = sfpt_mem == alloc_mem; |
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494 Node *mem = sfpt_mem; |
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495 while (!done) { |
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496 if (visited.test_set(mem->_idx)) { |
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497 return NULL; // found a loop, give up |
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498 } |
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499 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn); |
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500 if (mem == start_mem || mem == alloc_mem) { |
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501 done = true; // hit a sentinel, return appropriate 0 value |
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502 } else if (mem->is_Initialize()) { |
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503 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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504 if (mem == NULL) { |
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505 done = true; // Something go wrong. |
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506 } else if (mem->is_Store()) { |
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507 const TypePtr* atype = mem->as_Store()->adr_type(); |
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508 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice"); |
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509 done = true; |
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510 } |
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511 } else if (mem->is_Store()) { |
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512 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr(); |
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513 assert(atype != NULL, "address type must be oopptr"); |
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514 assert(C->get_alias_index(atype) == alias_idx && |
223 | 515 atype->is_known_instance_field() && atype->offset() == offset && |
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516 atype->instance_id() == instance_id, "store is correct memory slice"); |
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517 done = true; |
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518 } else if (mem->is_Phi()) { |
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519 // try to find a phi's unique input |
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520 Node *unique_input = NULL; |
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521 Node *top = C->top(); |
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522 for (uint i = 1; i < mem->req(); i++) { |
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523 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn); |
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524 if (n == NULL || n == top || n == mem) { |
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525 continue; |
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526 } else if (unique_input == NULL) { |
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527 unique_input = n; |
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528 } else if (unique_input != n) { |
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529 unique_input = top; |
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530 break; |
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531 } |
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532 } |
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533 if (unique_input != NULL && unique_input != top) { |
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534 mem = unique_input; |
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535 } else { |
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536 done = true; |
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537 } |
a8880a78d355
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538 } else { |
a8880a78d355
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539 assert(false, "unexpected node"); |
a8880a78d355
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540 } |
a8880a78d355
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parents:
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|
541 } |
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|
542 if (mem != NULL) { |
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543 if (mem == start_mem || mem == alloc_mem) { |
a8880a78d355
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544 // hit a sentinel, return appropriate 0 value |
a8880a78d355
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parents:
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545 return _igvn.zerocon(ft); |
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parents:
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546 } else if (mem->is_Store()) { |
a8880a78d355
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547 return mem->in(MemNode::ValueIn); |
a8880a78d355
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548 } else if (mem->is_Phi()) { |
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549 // attempt to produce a Phi reflecting the values on the input paths of the Phi |
247 | 550 Node_Stack value_phis(a, 8); |
253
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6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
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551 Node * phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit); |
73
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552 if (phi != NULL) { |
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553 return phi; |
247 | 554 } else { |
555 // Kill all new Phis | |
556 while(value_phis.is_nonempty()) { | |
557 Node* n = value_phis.node(); | |
1621
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6677629: PhaseIterGVN::subsume_node() should call hash_delete() and add_users_to_worklist()
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558 _igvn.replace_node(n, C->top()); |
247 | 559 value_phis.pop(); |
560 } | |
73
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561 } |
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|
562 } |
a8880a78d355
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|
563 } |
a8880a78d355
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564 // Something go wrong. |
a8880a78d355
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565 return NULL; |
a8880a78d355
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566 } |
a8880a78d355
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567 |
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568 // Check the possibility of scalar replacement. |
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569 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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570 // Scan the uses of the allocation to check for anything that would |
a8880a78d355
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571 // prevent us from eliminating it. |
a8880a78d355
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572 NOT_PRODUCT( const char* fail_eliminate = NULL; ) |
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573 DEBUG_ONLY( Node* disq_node = NULL; ) |
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574 bool can_eliminate = true; |
a8880a78d355
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|
575 |
a8880a78d355
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576 Node* res = alloc->result_cast(); |
a8880a78d355
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577 const TypeOopPtr* res_type = NULL; |
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578 if (res == NULL) { |
a8880a78d355
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579 // All users were eliminated. |
a8880a78d355
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580 } else if (!res->is_CheckCastPP()) { |
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581 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";) |
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582 can_eliminate = false; |
a8880a78d355
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diff
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|
583 } else { |
a8880a78d355
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584 res_type = _igvn.type(res)->isa_oopptr(); |
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585 if (res_type == NULL) { |
a8880a78d355
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586 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";) |
a8880a78d355
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587 can_eliminate = false; |
a8880a78d355
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588 } else if (res_type->isa_aryptr()) { |
a8880a78d355
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589 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
a8880a78d355
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590 if (length < 0) { |
a8880a78d355
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diff
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591 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";) |
a8880a78d355
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592 can_eliminate = false; |
a8880a78d355
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diff
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|
593 } |
a8880a78d355
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parents:
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diff
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|
594 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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parents:
66
diff
changeset
|
595 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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diff
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|
596 |
a8880a78d355
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597 if (can_eliminate && res != NULL) { |
a8880a78d355
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598 for (DUIterator_Fast jmax, j = res->fast_outs(jmax); |
a8880a78d355
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diff
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599 j < jmax && can_eliminate; j++) { |
a8880a78d355
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diff
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|
600 Node* use = res->fast_out(j); |
a8880a78d355
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|
601 |
a8880a78d355
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diff
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|
602 if (use->is_AddP()) { |
a8880a78d355
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diff
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|
603 const TypePtr* addp_type = _igvn.type(use)->is_ptr(); |
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604 int offset = addp_type->offset(); |
a8880a78d355
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diff
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|
605 |
a8880a78d355
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diff
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|
606 if (offset == Type::OffsetTop || offset == Type::OffsetBot) { |
a8880a78d355
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diff
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607 NOT_PRODUCT(fail_eliminate = "Undefined field referrence";) |
a8880a78d355
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diff
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|
608 can_eliminate = false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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parents:
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diff
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|
609 break; |
a8880a78d355
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diff
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|
610 } |
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diff
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|
611 for (DUIterator_Fast kmax, k = use->fast_outs(kmax); |
a8880a78d355
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612 k < kmax && can_eliminate; k++) { |
a8880a78d355
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diff
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613 Node* n = use->fast_out(k); |
a8880a78d355
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614 if (!n->is_Store() && n->Opcode() != Op_CastP2X) { |
a8880a78d355
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615 DEBUG_ONLY(disq_node = n;) |
253
b0fe4deeb9fb
6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
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diff
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616 if (n->is_Load() || n->is_LoadStore()) { |
73
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617 NOT_PRODUCT(fail_eliminate = "Field load";) |
a8880a78d355
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618 } else { |
a8880a78d355
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619 NOT_PRODUCT(fail_eliminate = "Not store field referrence";) |
a8880a78d355
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620 } |
a8880a78d355
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621 can_eliminate = false; |
a8880a78d355
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|
622 } |
a8880a78d355
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diff
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|
623 } |
a8880a78d355
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diff
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|
624 } else if (use->is_SafePoint()) { |
a8880a78d355
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diff
changeset
|
625 SafePointNode* sfpt = use->as_SafePoint(); |
168
7793bd37a336
6705887: Compressed Oops: generate x64 addressing and implicit null checks with narrow oops
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diff
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626 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) { |
73
a8880a78d355
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diff
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627 // Object is passed as argument. |
a8880a78d355
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66
diff
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|
628 DEBUG_ONLY(disq_node = use;) |
a8880a78d355
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kvn
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|
629 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";) |
a8880a78d355
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diff
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|
630 can_eliminate = false; |
a8880a78d355
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diff
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|
631 } |
a8880a78d355
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kvn
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66
diff
changeset
|
632 Node* sfptMem = sfpt->memory(); |
a8880a78d355
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633 if (sfptMem == NULL || sfptMem->is_top()) { |
a8880a78d355
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diff
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|
634 DEBUG_ONLY(disq_node = use;) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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diff
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|
635 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";) |
a8880a78d355
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kvn
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diff
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636 can_eliminate = false; |
a8880a78d355
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diff
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|
637 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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diff
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|
638 safepoints.append_if_missing(sfpt); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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diff
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|
639 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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diff
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|
640 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark |
a8880a78d355
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641 if (use->is_Phi()) { |
a8880a78d355
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642 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) { |
a8880a78d355
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643 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
a8880a78d355
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kvn
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|
644 } else { |
a8880a78d355
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|
645 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";) |
a8880a78d355
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diff
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|
646 } |
a8880a78d355
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changeset
|
647 DEBUG_ONLY(disq_node = use;) |
a8880a78d355
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kvn
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diff
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|
648 } else { |
a8880a78d355
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kvn
parents:
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diff
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|
649 if (use->Opcode() == Op_Return) { |
a8880a78d355
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kvn
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650 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
a8880a78d355
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651 }else { |
a8880a78d355
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652 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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|
653 } |
a8880a78d355
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kvn
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|
654 DEBUG_ONLY(disq_node = use;) |
a8880a78d355
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|
655 } |
a8880a78d355
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kvn
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|
656 can_eliminate = false; |
a8880a78d355
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|
657 } |
a8880a78d355
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kvn
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|
658 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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|
659 } |
a8880a78d355
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|
660 |
a8880a78d355
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|
661 #ifndef PRODUCT |
a8880a78d355
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662 if (PrintEliminateAllocations) { |
a8880a78d355
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|
663 if (can_eliminate) { |
a8880a78d355
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|
664 tty->print("Scalar "); |
a8880a78d355
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|
665 if (res == NULL) |
a8880a78d355
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|
666 alloc->dump(); |
a8880a78d355
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|
667 else |
a8880a78d355
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66
diff
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|
668 res->dump(); |
10278 | 669 } else if (alloc->_is_scalar_replaceable) { |
73
a8880a78d355
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670 tty->print("NotScalar (%s)", fail_eliminate); |
a8880a78d355
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|
671 if (res == NULL) |
a8880a78d355
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diff
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|
672 alloc->dump(); |
a8880a78d355
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kvn
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diff
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|
673 else |
a8880a78d355
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kvn
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|
674 res->dump(); |
a8880a78d355
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|
675 #ifdef ASSERT |
a8880a78d355
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66
diff
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|
676 if (disq_node != NULL) { |
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677 tty->print(" >>>> "); |
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678 disq_node->dump(); |
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679 } |
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680 #endif /*ASSERT*/ |
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681 } |
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682 } |
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|
683 #endif |
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684 return can_eliminate; |
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|
685 } |
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686 |
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687 // Do scalar replacement. |
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688 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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689 GrowableArray <SafePointNode *> safepoints_done; |
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690 |
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691 ciKlass* klass = NULL; |
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692 ciInstanceKlass* iklass = NULL; |
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693 int nfields = 0; |
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694 int array_base; |
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695 int element_size; |
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696 BasicType basic_elem_type; |
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697 ciType* elem_type; |
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698 |
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699 Node* res = alloc->result_cast(); |
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700 const TypeOopPtr* res_type = NULL; |
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701 if (res != NULL) { // Could be NULL when there are no users |
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702 res_type = _igvn.type(res)->isa_oopptr(); |
a8880a78d355
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703 } |
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|
704 |
a8880a78d355
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705 if (res != NULL) { |
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706 klass = res_type->klass(); |
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707 if (res_type->isa_instptr()) { |
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708 // find the fields of the class which will be needed for safepoint debug information |
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709 assert(klass->is_instance_klass(), "must be an instance klass."); |
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710 iklass = klass->as_instance_klass(); |
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711 nfields = iklass->nof_nonstatic_fields(); |
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712 } else { |
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713 // find the array's elements which will be needed for safepoint debug information |
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714 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
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715 assert(klass->is_array_klass() && nfields >= 0, "must be an array klass."); |
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716 elem_type = klass->as_array_klass()->element_type(); |
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717 basic_elem_type = elem_type->basic_type(); |
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718 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type); |
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719 element_size = type2aelembytes(basic_elem_type); |
a8880a78d355
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|
720 } |
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|
721 } |
a8880a78d355
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|
722 // |
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|
723 // Process the safepoint uses |
a8880a78d355
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|
724 // |
a8880a78d355
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|
725 while (safepoints.length() > 0) { |
a8880a78d355
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|
726 SafePointNode* sfpt = safepoints.pop(); |
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727 Node* mem = sfpt->memory(); |
a8880a78d355
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|
728 uint first_ind = sfpt->req(); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
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6725
diff
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|
729 SafePointScalarObjectNode* sobj = new (C) SafePointScalarObjectNode(res_type, |
73
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730 #ifdef ASSERT |
a8880a78d355
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|
731 alloc, |
a8880a78d355
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|
732 #endif |
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|
733 first_ind, nfields); |
4115 | 734 sobj->init_req(0, C->root()); |
73
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|
735 transform_later(sobj); |
a8880a78d355
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|
736 |
a8880a78d355
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|
737 // Scan object's fields adding an input to the safepoint for each field. |
a8880a78d355
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|
738 for (int j = 0; j < nfields; j++) { |
306
af945ba2e739
6741738: TypePtr::add_offset() set incorrect offset when the add overflows
kvn
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253
diff
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|
739 intptr_t offset; |
73
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740 ciField* field = NULL; |
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|
741 if (iklass != NULL) { |
a8880a78d355
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|
742 field = iklass->nonstatic_field_at(j); |
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|
743 offset = field->offset(); |
a8880a78d355
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diff
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|
744 elem_type = field->type(); |
a8880a78d355
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66
diff
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|
745 basic_elem_type = field->layout_type(); |
a8880a78d355
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diff
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|
746 } else { |
306
af945ba2e739
6741738: TypePtr::add_offset() set incorrect offset when the add overflows
kvn
parents:
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diff
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|
747 offset = array_base + j * (intptr_t)element_size; |
73
a8880a78d355
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diff
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|
748 } |
a8880a78d355
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diff
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|
749 |
a8880a78d355
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kvn
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|
750 const Type *field_type; |
a8880a78d355
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diff
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|
751 // The next code is taken from Parse::do_get_xxx(). |
124
b130b98db9cf
6689060: Escape Analysis does not work with Compressed Oops
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113
diff
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|
752 if (basic_elem_type == T_OBJECT || basic_elem_type == T_ARRAY) { |
73
a8880a78d355
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parents:
66
diff
changeset
|
753 if (!elem_type->is_loaded()) { |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
754 field_type = TypeInstPtr::BOTTOM; |
1682
e5dfb3ccb88b
6969569: assert(is_static() && is_constant()) failed: illegal call to constant_value()
kvn
parents:
1621
diff
changeset
|
755 } else if (field != NULL && field->is_constant() && field->is_static()) { |
73
a8880a78d355
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diff
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|
756 // This can happen if the constant oop is non-perm. |
a8880a78d355
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|
757 ciObject* con = field->constant_value().as_object(); |
a8880a78d355
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|
758 // Do not "join" in the previous type; it doesn't add value, |
a8880a78d355
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diff
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|
759 // and may yield a vacuous result if the field is of interface type. |
a8880a78d355
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kvn
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diff
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|
760 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); |
a8880a78d355
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diff
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|
761 assert(field_type != NULL, "field singleton type must be consistent"); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
762 } else { |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
763 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass()); |
a8880a78d355
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|
764 } |
124
b130b98db9cf
6689060: Escape Analysis does not work with Compressed Oops
kvn
parents:
113
diff
changeset
|
765 if (UseCompressedOops) { |
221
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
kvn
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216
diff
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|
766 field_type = field_type->make_narrowoop(); |
124
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6689060: Escape Analysis does not work with Compressed Oops
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|
767 basic_elem_type = T_NARROWOOP; |
b130b98db9cf
6689060: Escape Analysis does not work with Compressed Oops
kvn
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diff
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|
768 } |
73
a8880a78d355
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diff
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|
769 } else { |
a8880a78d355
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kvn
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diff
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|
770 field_type = Type::get_const_basic_type(basic_elem_type); |
a8880a78d355
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diff
changeset
|
771 } |
a8880a78d355
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66
diff
changeset
|
772 |
a8880a78d355
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66
diff
changeset
|
773 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr(); |
a8880a78d355
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kvn
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diff
changeset
|
774 |
a8880a78d355
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kvn
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66
diff
changeset
|
775 Node *field_val = value_from_mem(mem, basic_elem_type, field_type, field_addr_type, alloc); |
a8880a78d355
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diff
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|
776 if (field_val == NULL) { |
4115 | 777 // We weren't able to find a value for this field, |
778 // give up on eliminating this allocation. | |
779 | |
780 // Remove any extra entries we added to the safepoint. | |
73
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diff
changeset
|
781 uint last = sfpt->req() - 1; |
a8880a78d355
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66
diff
changeset
|
782 for (int k = 0; k < j; k++) { |
a8880a78d355
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66
diff
changeset
|
783 sfpt->del_req(last--); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
784 } |
a8880a78d355
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kvn
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66
diff
changeset
|
785 // rollback processed safepoints |
a8880a78d355
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66
diff
changeset
|
786 while (safepoints_done.length() > 0) { |
a8880a78d355
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kvn
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diff
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|
787 SafePointNode* sfpt_done = safepoints_done.pop(); |
a8880a78d355
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66
diff
changeset
|
788 // remove any extra entries we added to the safepoint |
a8880a78d355
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kvn
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66
diff
changeset
|
789 last = sfpt_done->req() - 1; |
a8880a78d355
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kvn
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66
diff
changeset
|
790 for (int k = 0; k < nfields; k++) { |
a8880a78d355
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kvn
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66
diff
changeset
|
791 sfpt_done->del_req(last--); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
792 } |
a8880a78d355
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kvn
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66
diff
changeset
|
793 JVMState *jvms = sfpt_done->jvms(); |
a8880a78d355
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kvn
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66
diff
changeset
|
794 jvms->set_endoff(sfpt_done->req()); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
795 // Now make a pass over the debug information replacing any references |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
796 // to SafePointScalarObjectNode with the allocated object. |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
797 int start = jvms->debug_start(); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
798 int end = jvms->debug_end(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
799 for (int i = start; i < end; i++) { |
a8880a78d355
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kvn
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66
diff
changeset
|
800 if (sfpt_done->in(i)->is_SafePointScalarObject()) { |
a8880a78d355
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kvn
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66
diff
changeset
|
801 SafePointScalarObjectNode* scobj = sfpt_done->in(i)->as_SafePointScalarObject(); |
a8880a78d355
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kvn
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66
diff
changeset
|
802 if (scobj->first_index() == sfpt_done->req() && |
a8880a78d355
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kvn
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66
diff
changeset
|
803 scobj->n_fields() == (uint)nfields) { |
a8880a78d355
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kvn
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66
diff
changeset
|
804 assert(scobj->alloc() == alloc, "sanity"); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
805 sfpt_done->set_req(i, res); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
806 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
807 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
808 } |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
809 } |
a8880a78d355
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kvn
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66
diff
changeset
|
810 #ifndef PRODUCT |
a8880a78d355
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kvn
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66
diff
changeset
|
811 if (PrintEliminateAllocations) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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812 if (field != NULL) { |
a8880a78d355
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813 tty->print("=== At SafePoint node %d can't find value of Field: ", |
a8880a78d355
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814 sfpt->_idx); |
a8880a78d355
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kvn
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diff
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815 field->print(); |
a8880a78d355
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816 int field_idx = C->get_alias_index(field_addr_type); |
a8880a78d355
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817 tty->print(" (alias_idx=%d)", field_idx); |
a8880a78d355
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818 } else { // Array's element |
a8880a78d355
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819 tty->print("=== At SafePoint node %d can't find value of array element [%d]", |
a8880a78d355
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820 sfpt->_idx, j); |
a8880a78d355
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diff
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|
821 } |
a8880a78d355
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822 tty->print(", which prevents elimination of: "); |
a8880a78d355
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|
823 if (res == NULL) |
a8880a78d355
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824 alloc->dump(); |
a8880a78d355
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825 else |
a8880a78d355
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826 res->dump(); |
a8880a78d355
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827 } |
a8880a78d355
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828 #endif |
a8880a78d355
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829 return false; |
a8880a78d355
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830 } |
124
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831 if (UseCompressedOops && field_type->isa_narrowoop()) { |
b130b98db9cf
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832 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation |
b130b98db9cf
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833 // to be able scalar replace the allocation. |
221
1e026f8da827
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834 if (field_val->is_EncodeP()) { |
1e026f8da827
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835 field_val = field_val->in(1); |
1e026f8da827
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836 } else { |
10279
70120f47d403
8014189: JVM crash with SEGV in ConnectionGraph::record_for_escape_analysis()
kvn
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diff
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837 field_val = transform_later(new (C) DecodeNNode(field_val, field_val->get_ptr_type())); |
221
1e026f8da827
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838 } |
124
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839 } |
73
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840 sfpt->add_req(field_val); |
a8880a78d355
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841 } |
a8880a78d355
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842 JVMState *jvms = sfpt->jvms(); |
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843 jvms->set_endoff(sfpt->req()); |
a8880a78d355
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844 // Now make a pass over the debug information replacing any references |
a8880a78d355
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845 // to the allocated object with "sobj" |
a8880a78d355
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846 int start = jvms->debug_start(); |
a8880a78d355
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847 int end = jvms->debug_end(); |
10278 | 848 sfpt->replace_edges_in_range(res, sobj, start, end); |
73
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849 safepoints_done.append_if_missing(sfpt); // keep it for rollback |
a8880a78d355
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850 } |
a8880a78d355
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851 return true; |
a8880a78d355
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|
852 } |
a8880a78d355
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853 |
a8880a78d355
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854 // Process users of eliminated allocation. |
10278 | 855 void PhaseMacroExpand::process_users_of_allocation(CallNode *alloc) { |
73
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856 Node* res = alloc->result_cast(); |
a8880a78d355
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857 if (res != NULL) { |
a8880a78d355
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858 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) { |
a8880a78d355
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859 Node *use = res->last_out(j); |
a8880a78d355
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860 uint oc1 = res->outcnt(); |
a8880a78d355
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|
861 |
a8880a78d355
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862 if (use->is_AddP()) { |
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863 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) { |
a8880a78d355
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864 Node *n = use->last_out(k); |
a8880a78d355
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865 uint oc2 = use->outcnt(); |
a8880a78d355
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866 if (n->is_Store()) { |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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diff
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|
867 #ifdef ASSERT |
f96a1a986f7b
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kvn
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diff
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|
868 // Verify that there is no dependent MemBarVolatile nodes, |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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diff
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869 // they should be removed during IGVN, see MemBarNode::Ideal(). |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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diff
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870 for (DUIterator_Fast pmax, p = n->fast_outs(pmax); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
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diff
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|
871 p < pmax; p++) { |
f96a1a986f7b
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kvn
parents:
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diff
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|
872 Node* mb = n->fast_out(p); |
f96a1a986f7b
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kvn
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diff
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873 assert(mb->is_Initialize() || !mb->is_MemBar() || |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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1080
diff
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874 mb->req() <= MemBarNode::Precedent || |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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875 mb->in(MemBarNode::Precedent) != n, |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
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diff
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876 "MemBarVolatile should be eliminated for non-escaping object"); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
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|
877 } |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
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diff
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|
878 #endif |
73
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879 _igvn.replace_node(n, n->in(MemNode::Memory)); |
a8880a78d355
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|
880 } else { |
a8880a78d355
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diff
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|
881 eliminate_card_mark(n); |
a8880a78d355
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diff
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|
882 } |
a8880a78d355
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diff
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|
883 k -= (oc2 - use->outcnt()); |
a8880a78d355
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diff
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|
884 } |
a8880a78d355
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diff
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|
885 } else { |
a8880a78d355
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diff
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|
886 eliminate_card_mark(use); |
a8880a78d355
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diff
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|
887 } |
a8880a78d355
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kvn
parents:
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diff
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|
888 j -= (oc1 - res->outcnt()); |
a8880a78d355
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diff
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|
889 } |
a8880a78d355
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|
890 assert(res->outcnt() == 0, "all uses of allocated objects must be deleted"); |
a8880a78d355
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|
891 _igvn.remove_dead_node(res); |
a8880a78d355
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kvn
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66
diff
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|
892 } |
a8880a78d355
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diff
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|
893 |
a8880a78d355
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diff
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|
894 // |
a8880a78d355
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diff
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|
895 // Process other users of allocation's projections |
a8880a78d355
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diff
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|
896 // |
a8880a78d355
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|
897 if (_resproj != NULL && _resproj->outcnt() != 0) { |
10278 | 898 // First disconnect stores captured by Initialize node. |
899 // If Initialize node is eliminated first in the following code, | |
900 // it will kill such stores and DUIterator_Last will assert. | |
901 for (DUIterator_Fast jmax, j = _resproj->fast_outs(jmax); j < jmax; j++) { | |
902 Node *use = _resproj->fast_out(j); | |
903 if (use->is_AddP()) { | |
904 // raw memory addresses used only by the initialization | |
905 _igvn.replace_node(use, C->top()); | |
906 --j; --jmax; | |
907 } | |
908 } | |
73
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909 for (DUIterator_Last jmin, j = _resproj->last_outs(jmin); j >= jmin; ) { |
a8880a78d355
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|
910 Node *use = _resproj->last_out(j); |
a8880a78d355
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|
911 uint oc1 = _resproj->outcnt(); |
a8880a78d355
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kvn
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66
diff
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|
912 if (use->is_Initialize()) { |
a8880a78d355
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kvn
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66
diff
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|
913 // Eliminate Initialize node. |
a8880a78d355
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diff
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|
914 InitializeNode *init = use->as_Initialize(); |
a8880a78d355
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|
915 assert(init->outcnt() <= 2, "only a control and memory projection expected"); |
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916 Node *ctrl_proj = init->proj_out(TypeFunc::Control); |
a8880a78d355
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|
917 if (ctrl_proj != NULL) { |
a8880a78d355
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|
918 assert(init->in(TypeFunc::Control) == _fallthroughcatchproj, "allocation control projection"); |
a8880a78d355
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919 _igvn.replace_node(ctrl_proj, _fallthroughcatchproj); |
a8880a78d355
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|
920 } |
a8880a78d355
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|
921 Node *mem_proj = init->proj_out(TypeFunc::Memory); |
a8880a78d355
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|
922 if (mem_proj != NULL) { |
a8880a78d355
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|
923 Node *mem = init->in(TypeFunc::Memory); |
a8880a78d355
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|
924 #ifdef ASSERT |
a8880a78d355
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|
925 if (mem->is_MergeMem()) { |
a8880a78d355
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|
926 assert(mem->in(TypeFunc::Memory) == _memproj_fallthrough, "allocation memory projection"); |
a8880a78d355
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|
927 } else { |
a8880a78d355
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|
928 assert(mem == _memproj_fallthrough, "allocation memory projection"); |
a8880a78d355
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diff
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|
929 } |
a8880a78d355
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kvn
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|
930 #endif |
a8880a78d355
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|
931 _igvn.replace_node(mem_proj, mem); |
a8880a78d355
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|
932 } |
a8880a78d355
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kvn
parents:
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diff
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|
933 } else { |
a8880a78d355
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kvn
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66
diff
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|
934 assert(false, "only Initialize or AddP expected"); |
a8880a78d355
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kvn
parents:
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diff
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|
935 } |
a8880a78d355
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|
936 j -= (oc1 - _resproj->outcnt()); |
a8880a78d355
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|
937 } |
a8880a78d355
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kvn
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66
diff
changeset
|
938 } |
a8880a78d355
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kvn
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66
diff
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|
939 if (_fallthroughcatchproj != NULL) { |
a8880a78d355
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|
940 _igvn.replace_node(_fallthroughcatchproj, alloc->in(TypeFunc::Control)); |
a8880a78d355
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kvn
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diff
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|
941 } |
a8880a78d355
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kvn
parents:
66
diff
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|
942 if (_memproj_fallthrough != NULL) { |
a8880a78d355
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kvn
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66
diff
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|
943 _igvn.replace_node(_memproj_fallthrough, alloc->in(TypeFunc::Memory)); |
a8880a78d355
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kvn
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diff
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|
944 } |
a8880a78d355
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kvn
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66
diff
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|
945 if (_memproj_catchall != NULL) { |
a8880a78d355
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kvn
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|
946 _igvn.replace_node(_memproj_catchall, C->top()); |
a8880a78d355
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kvn
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66
diff
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|
947 } |
a8880a78d355
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kvn
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66
diff
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|
948 if (_ioproj_fallthrough != NULL) { |
a8880a78d355
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kvn
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66
diff
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|
949 _igvn.replace_node(_ioproj_fallthrough, alloc->in(TypeFunc::I_O)); |
a8880a78d355
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kvn
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diff
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|
950 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
951 if (_ioproj_catchall != NULL) { |
a8880a78d355
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kvn
parents:
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diff
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952 _igvn.replace_node(_ioproj_catchall, C->top()); |
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953 } |
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954 if (_catchallcatchproj != NULL) { |
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955 _igvn.replace_node(_catchallcatchproj, C->top()); |
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956 } |
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957 } |
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958 |
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959 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) { |
10278 | 960 if (!EliminateAllocations || !alloc->_is_non_escaping) { |
961 return false; | |
962 } | |
963 Node* klass = alloc->in(AllocateNode::KlassNode); | |
964 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr(); | |
965 Node* res = alloc->result_cast(); | |
966 // Eliminate boxing allocations which are not used | |
967 // regardless scalar replacable status. | |
968 bool boxing_alloc = C->eliminate_boxing() && | |
969 tklass->klass()->is_instance_klass() && | |
970 tklass->klass()->as_instance_klass()->is_box_klass(); | |
971 if (!alloc->_is_scalar_replaceable && (!boxing_alloc || (res != NULL))) { | |
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972 return false; |
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973 } |
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974 |
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975 extract_call_projections(alloc); |
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976 |
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977 GrowableArray <SafePointNode *> safepoints; |
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978 if (!can_eliminate_allocation(alloc, safepoints)) { |
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979 return false; |
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980 } |
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981 |
10278 | 982 if (!alloc->_is_scalar_replaceable) { |
983 assert(res == NULL, "sanity"); | |
984 // We can only eliminate allocation if all debug info references | |
985 // are already replaced with SafePointScalarObject because | |
986 // we can't search for a fields value without instance_id. | |
987 if (safepoints.length() > 0) { | |
988 return false; | |
989 } | |
990 } | |
991 | |
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992 if (!scalar_replacement(alloc, safepoints)) { |
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993 return false; |
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994 } |
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995 |
1080
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996 CompileLog* log = C->log(); |
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997 if (log != NULL) { |
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998 log->head("eliminate_allocation type='%d'", |
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999 log->identify(tklass->klass())); |
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1000 JVMState* p = alloc->jvms(); |
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1001 while (p != NULL) { |
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1002 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); |
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1003 p = p->caller(); |
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1004 } |
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1005 log->tail("eliminate_allocation"); |
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1006 } |
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1007 |
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1008 process_users_of_allocation(alloc); |
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1009 |
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1010 #ifndef PRODUCT |
1080
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1011 if (PrintEliminateAllocations) { |
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1012 if (alloc->is_AllocateArray()) |
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1013 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx); |
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1014 else |
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1015 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx); |
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1016 } |
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1017 #endif |
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1018 |
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1019 return true; |
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1020 } |
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1021 |
10278 | 1022 bool PhaseMacroExpand::eliminate_boxing_node(CallStaticJavaNode *boxing) { |
1023 // EA should remove all uses of non-escaping boxing node. | |
1024 if (!C->eliminate_boxing() || boxing->proj_out(TypeFunc::Parms) != NULL) { | |
1025 return false; | |
1026 } | |
1027 | |
1028 extract_call_projections(boxing); | |
1029 | |
1030 const TypeTuple* r = boxing->tf()->range(); | |
1031 assert(r->cnt() > TypeFunc::Parms, "sanity"); | |
1032 const TypeInstPtr* t = r->field_at(TypeFunc::Parms)->isa_instptr(); | |
1033 assert(t != NULL, "sanity"); | |
1034 | |
1035 CompileLog* log = C->log(); | |
1036 if (log != NULL) { | |
1037 log->head("eliminate_boxing type='%d'", | |
1038 log->identify(t->klass())); | |
1039 JVMState* p = boxing->jvms(); | |
1040 while (p != NULL) { | |
1041 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); | |
1042 p = p->caller(); | |
1043 } | |
1044 log->tail("eliminate_boxing"); | |
1045 } | |
1046 | |
1047 process_users_of_allocation(boxing); | |
1048 | |
1049 #ifndef PRODUCT | |
1050 if (PrintEliminateAllocations) { | |
1051 tty->print("++++ Eliminated: %d ", boxing->_idx); | |
1052 boxing->method()->print_short_name(tty); | |
1053 tty->cr(); | |
1054 } | |
1055 #endif | |
1056 | |
1057 return true; | |
1058 } | |
0 | 1059 |
1060 //---------------------------set_eden_pointers------------------------- | |
1061 void PhaseMacroExpand::set_eden_pointers(Node* &eden_top_adr, Node* &eden_end_adr) { | |
1062 if (UseTLAB) { // Private allocation: load from TLS | |
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1063 Node* thread = transform_later(new (C) ThreadLocalNode()); |
0 | 1064 int tlab_top_offset = in_bytes(JavaThread::tlab_top_offset()); |
1065 int tlab_end_offset = in_bytes(JavaThread::tlab_end_offset()); | |
1066 eden_top_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_top_offset); | |
1067 eden_end_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_end_offset); | |
1068 } else { // Shared allocation: load from globals | |
1069 CollectedHeap* ch = Universe::heap(); | |
1070 address top_adr = (address)ch->top_addr(); | |
1071 address end_adr = (address)ch->end_addr(); | |
1072 eden_top_adr = makecon(TypeRawPtr::make(top_adr)); | |
1073 eden_end_adr = basic_plus_adr(eden_top_adr, end_adr - top_adr); | |
1074 } | |
1075 } | |
1076 | |
1077 | |
1078 Node* PhaseMacroExpand::make_load(Node* ctl, Node* mem, Node* base, int offset, const Type* value_type, BasicType bt) { | |
1079 Node* adr = basic_plus_adr(base, offset); | |
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1080 const TypePtr* adr_type = adr->bottom_type()->is_ptr(); |
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1081 Node* value = LoadNode::make(_igvn, ctl, mem, adr, adr_type, value_type, bt); |
0 | 1082 transform_later(value); |
1083 return value; | |
1084 } | |
1085 | |
1086 | |
1087 Node* PhaseMacroExpand::make_store(Node* ctl, Node* mem, Node* base, int offset, Node* value, BasicType bt) { | |
1088 Node* adr = basic_plus_adr(base, offset); | |
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1089 mem = StoreNode::make(_igvn, ctl, mem, adr, NULL, value, bt); |
0 | 1090 transform_later(mem); |
1091 return mem; | |
1092 } | |
1093 | |
1094 //============================================================================= | |
1095 // | |
1096 // A L L O C A T I O N | |
1097 // | |
1098 // Allocation attempts to be fast in the case of frequent small objects. | |
1099 // It breaks down like this: | |
1100 // | |
1101 // 1) Size in doublewords is computed. This is a constant for objects and | |
1102 // variable for most arrays. Doubleword units are used to avoid size | |
1103 // overflow of huge doubleword arrays. We need doublewords in the end for | |
1104 // rounding. | |
1105 // | |
1106 // 2) Size is checked for being 'too large'. Too-large allocations will go | |
1107 // the slow path into the VM. The slow path can throw any required | |
1108 // exceptions, and does all the special checks for very large arrays. The | |
1109 // size test can constant-fold away for objects. For objects with | |
1110 // finalizers it constant-folds the otherway: you always go slow with | |
1111 // finalizers. | |
1112 // | |
1113 // 3) If NOT using TLABs, this is the contended loop-back point. | |
1114 // Load-Locked the heap top. If using TLABs normal-load the heap top. | |
1115 // | |
1116 // 4) Check that heap top + size*8 < max. If we fail go the slow ` route. | |
1117 // NOTE: "top+size*8" cannot wrap the 4Gig line! Here's why: for largish | |
1118 // "size*8" we always enter the VM, where "largish" is a constant picked small | |
1119 // enough that there's always space between the eden max and 4Gig (old space is | |
1120 // there so it's quite large) and large enough that the cost of entering the VM | |
1121 // is dwarfed by the cost to initialize the space. | |
1122 // | |
1123 // 5) If NOT using TLABs, Store-Conditional the adjusted heap top back | |
1124 // down. If contended, repeat at step 3. If using TLABs normal-store | |
1125 // adjusted heap top back down; there is no contention. | |
1126 // | |
1127 // 6) If !ZeroTLAB then Bulk-clear the object/array. Fill in klass & mark | |
1128 // fields. | |
1129 // | |
1130 // 7) Merge with the slow-path; cast the raw memory pointer to the correct | |
1131 // oop flavor. | |
1132 // | |
1133 //============================================================================= | |
1134 // FastAllocateSizeLimit value is in DOUBLEWORDS. | |
1135 // Allocations bigger than this always go the slow route. | |
1136 // This value must be small enough that allocation attempts that need to | |
1137 // trigger exceptions go the slow route. Also, it must be small enough so | |
1138 // that heap_top + size_in_bytes does not wrap around the 4Gig limit. | |
1139 //=============================================================================j// | |
1140 // %%% Here is an old comment from parseHelper.cpp; is it outdated? | |
1141 // The allocator will coalesce int->oop copies away. See comment in | |
1142 // coalesce.cpp about how this works. It depends critically on the exact | |
1143 // code shape produced here, so if you are changing this code shape | |
1144 // make sure the GC info for the heap-top is correct in and around the | |
1145 // slow-path call. | |
1146 // | |
1147 | |
1148 void PhaseMacroExpand::expand_allocate_common( | |
1149 AllocateNode* alloc, // allocation node to be expanded | |
1150 Node* length, // array length for an array allocation | |
1151 const TypeFunc* slow_call_type, // Type of slow call | |
1152 address slow_call_address // Address of slow call | |
1153 ) | |
1154 { | |
1155 | |
1156 Node* ctrl = alloc->in(TypeFunc::Control); | |
1157 Node* mem = alloc->in(TypeFunc::Memory); | |
1158 Node* i_o = alloc->in(TypeFunc::I_O); | |
1159 Node* size_in_bytes = alloc->in(AllocateNode::AllocSize); | |
1160 Node* klass_node = alloc->in(AllocateNode::KlassNode); | |
1161 Node* initial_slow_test = alloc->in(AllocateNode::InitialTest); | |
1162 | |
1163 assert(ctrl != NULL, "must have control"); | |
1164 // We need a Region and corresponding Phi's to merge the slow-path and fast-path results. | |
1165 // they will not be used if "always_slow" is set | |
1166 enum { slow_result_path = 1, fast_result_path = 2 }; | |
1167 Node *result_region; | |
1168 Node *result_phi_rawmem; | |
1169 Node *result_phi_rawoop; | |
1170 Node *result_phi_i_o; | |
1171 | |
1172 // The initial slow comparison is a size check, the comparison | |
1173 // we want to do is a BoolTest::gt | |
1174 bool always_slow = false; | |
1175 int tv = _igvn.find_int_con(initial_slow_test, -1); | |
1176 if (tv >= 0) { | |
1177 always_slow = (tv == 1); | |
1178 initial_slow_test = NULL; | |
1179 } else { | |
1180 initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn); | |
1181 } | |
1182 | |
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1183 if (C->env()->dtrace_alloc_probes() || |
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1184 !UseTLAB && (!Universe::heap()->supports_inline_contig_alloc() || |
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1185 (UseConcMarkSweepGC && CMSIncrementalMode))) { |
0 | 1186 // Force slow-path allocation |
1187 always_slow = true; | |
1188 initial_slow_test = NULL; | |
1189 } | |
1190 | |
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1191 |
0 | 1192 enum { too_big_or_final_path = 1, need_gc_path = 2 }; |
1193 Node *slow_region = NULL; | |
1194 Node *toobig_false = ctrl; | |
1195 | |
1196 assert (initial_slow_test == NULL || !always_slow, "arguments must be consistent"); | |
1197 // generate the initial test if necessary | |
1198 if (initial_slow_test != NULL ) { | |
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1199 slow_region = new (C) RegionNode(3); |
0 | 1200 |
1201 // Now make the initial failure test. Usually a too-big test but | |
1202 // might be a TRUE for finalizers or a fancy class check for | |
1203 // newInstance0. | |
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1204 IfNode *toobig_iff = new (C) IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN); |
0 | 1205 transform_later(toobig_iff); |
1206 // Plug the failing-too-big test into the slow-path region | |
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1207 Node *toobig_true = new (C) IfTrueNode( toobig_iff ); |
0 | 1208 transform_later(toobig_true); |
1209 slow_region ->init_req( too_big_or_final_path, toobig_true ); | |
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1210 toobig_false = new (C) IfFalseNode( toobig_iff ); |
0 | 1211 transform_later(toobig_false); |
1212 } else { // No initial test, just fall into next case | |
1213 toobig_false = ctrl; | |
1214 debug_only(slow_region = NodeSentinel); | |
1215 } | |
1216 | |
1217 Node *slow_mem = mem; // save the current memory state for slow path | |
1218 // generate the fast allocation code unless we know that the initial test will always go slow | |
1219 if (!always_slow) { | |
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1220 // Fast path modifies only raw memory. |
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1221 if (mem->is_MergeMem()) { |
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1222 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw); |
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1223 } |
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1224 |
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1225 Node* eden_top_adr; |
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1226 Node* eden_end_adr; |
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1227 |
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1228 set_eden_pointers(eden_top_adr, eden_end_adr); |
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1229 |
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1230 // Load Eden::end. Loop invariant and hoisted. |
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1231 // |
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1232 // Note: We set the control input on "eden_end" and "old_eden_top" when using |
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1233 // a TLAB to work around a bug where these values were being moved across |
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1234 // a safepoint. These are not oops, so they cannot be include in the oop |
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1235 // map, but they can be changed by a GC. The proper way to fix this would |
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1236 // be to set the raw memory state when generating a SafepointNode. However |
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1237 // this will require extensive changes to the loop optimization in order to |
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1238 // prevent a degradation of the optimization. |
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1239 // See comment in memnode.hpp, around line 227 in class LoadPNode. |
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1240 Node *eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS); |
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1241 |
0 | 1242 // allocate the Region and Phi nodes for the result |
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1243 result_region = new (C) RegionNode(3); |
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1244 result_phi_rawmem = new (C) PhiNode(result_region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1245 result_phi_rawoop = new (C) PhiNode(result_region, TypeRawPtr::BOTTOM); |
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1246 result_phi_i_o = new (C) PhiNode(result_region, Type::ABIO); // I/O is used for Prefetch |
0 | 1247 |
1248 // We need a Region for the loop-back contended case. | |
1249 enum { fall_in_path = 1, contended_loopback_path = 2 }; | |
1250 Node *contended_region; | |
1251 Node *contended_phi_rawmem; | |
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1252 if (UseTLAB) { |
0 | 1253 contended_region = toobig_false; |
1254 contended_phi_rawmem = mem; | |
1255 } else { | |
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1256 contended_region = new (C) RegionNode(3); |
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1257 contended_phi_rawmem = new (C) PhiNode(contended_region, Type::MEMORY, TypeRawPtr::BOTTOM); |
0 | 1258 // Now handle the passing-too-big test. We fall into the contended |
1259 // loop-back merge point. | |
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1260 contended_region ->init_req(fall_in_path, toobig_false); |
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1261 contended_phi_rawmem->init_req(fall_in_path, mem); |
0 | 1262 transform_later(contended_region); |
1263 transform_later(contended_phi_rawmem); | |
1264 } | |
1265 | |
1266 // Load(-locked) the heap top. | |
1267 // See note above concerning the control input when using a TLAB | |
1268 Node *old_eden_top = UseTLAB | |
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1269 ? new (C) LoadPNode (ctrl, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM) |
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1270 : new (C) LoadPLockedNode(contended_region, contended_phi_rawmem, eden_top_adr); |
0 | 1271 |
1272 transform_later(old_eden_top); | |
1273 // Add to heap top to get a new heap top | |
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1274 Node *new_eden_top = new (C) AddPNode(top(), old_eden_top, size_in_bytes); |
0 | 1275 transform_later(new_eden_top); |
1276 // Check for needing a GC; compare against heap end | |
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1277 Node *needgc_cmp = new (C) CmpPNode(new_eden_top, eden_end); |
0 | 1278 transform_later(needgc_cmp); |
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1279 Node *needgc_bol = new (C) BoolNode(needgc_cmp, BoolTest::ge); |
0 | 1280 transform_later(needgc_bol); |
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1281 IfNode *needgc_iff = new (C) IfNode(contended_region, needgc_bol, PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN); |
0 | 1282 transform_later(needgc_iff); |
1283 | |
1284 // Plug the failing-heap-space-need-gc test into the slow-path region | |
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1285 Node *needgc_true = new (C) IfTrueNode(needgc_iff); |
0 | 1286 transform_later(needgc_true); |
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1287 if (initial_slow_test) { |
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1288 slow_region->init_req(need_gc_path, needgc_true); |
0 | 1289 // This completes all paths into the slow merge point |
1290 transform_later(slow_region); | |
1291 } else { // No initial slow path needed! | |
1292 // Just fall from the need-GC path straight into the VM call. | |
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1293 slow_region = needgc_true; |
0 | 1294 } |
1295 // No need for a GC. Setup for the Store-Conditional | |
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1296 Node *needgc_false = new (C) IfFalseNode(needgc_iff); |
0 | 1297 transform_later(needgc_false); |
1298 | |
1299 // Grab regular I/O before optional prefetch may change it. | |
1300 // Slow-path does no I/O so just set it to the original I/O. | |
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1301 result_phi_i_o->init_req(slow_result_path, i_o); |
0 | 1302 |
1303 i_o = prefetch_allocation(i_o, needgc_false, contended_phi_rawmem, | |
1304 old_eden_top, new_eden_top, length); | |
1305 | |
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1306 // Name successful fast-path variables |
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1307 Node* fast_oop = old_eden_top; |
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1308 Node* fast_oop_ctrl; |
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1309 Node* fast_oop_rawmem; |
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1310 |
0 | 1311 // Store (-conditional) the modified eden top back down. |
1312 // StorePConditional produces flags for a test PLUS a modified raw | |
1313 // memory state. | |
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1314 if (UseTLAB) { |
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1315 Node* store_eden_top = |
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1316 new (C) StorePNode(needgc_false, contended_phi_rawmem, eden_top_adr, |
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1317 TypeRawPtr::BOTTOM, new_eden_top); |
0 | 1318 transform_later(store_eden_top); |
1319 fast_oop_ctrl = needgc_false; // No contention, so this is the fast path | |
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1320 fast_oop_rawmem = store_eden_top; |
0 | 1321 } else { |
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1322 Node* store_eden_top = |
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1323 new (C) StorePConditionalNode(needgc_false, contended_phi_rawmem, eden_top_adr, |
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1324 new_eden_top, fast_oop/*old_eden_top*/); |
0 | 1325 transform_later(store_eden_top); |
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1326 Node *contention_check = new (C) BoolNode(store_eden_top, BoolTest::ne); |
0 | 1327 transform_later(contention_check); |
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1328 store_eden_top = new (C) SCMemProjNode(store_eden_top); |
0 | 1329 transform_later(store_eden_top); |
1330 | |
1331 // If not using TLABs, check to see if there was contention. | |
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1332 IfNode *contention_iff = new (C) IfNode (needgc_false, contention_check, PROB_MIN, COUNT_UNKNOWN); |
0 | 1333 transform_later(contention_iff); |
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1334 Node *contention_true = new (C) IfTrueNode(contention_iff); |
0 | 1335 transform_later(contention_true); |
1336 // If contention, loopback and try again. | |
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1337 contended_region->init_req(contended_loopback_path, contention_true); |
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1338 contended_phi_rawmem->init_req(contended_loopback_path, store_eden_top); |
0 | 1339 |
1340 // Fast-path succeeded with no contention! | |
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1341 Node *contention_false = new (C) IfFalseNode(contention_iff); |
0 | 1342 transform_later(contention_false); |
1343 fast_oop_ctrl = contention_false; | |
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1344 |
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1345 // Bump total allocated bytes for this thread |
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1346 Node* thread = new (C) ThreadLocalNode(); |
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1347 transform_later(thread); |
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1348 Node* alloc_bytes_adr = basic_plus_adr(top()/*not oop*/, thread, |
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1349 in_bytes(JavaThread::allocated_bytes_offset())); |
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1350 Node* alloc_bytes = make_load(fast_oop_ctrl, store_eden_top, alloc_bytes_adr, |
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1351 0, TypeLong::LONG, T_LONG); |
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1352 #ifdef _LP64 |
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1353 Node* alloc_size = size_in_bytes; |
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1354 #else |
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1355 Node* alloc_size = new (C) ConvI2LNode(size_in_bytes); |
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1356 transform_later(alloc_size); |
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1357 #endif |
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1358 Node* new_alloc_bytes = new (C) AddLNode(alloc_bytes, alloc_size); |
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1359 transform_later(new_alloc_bytes); |
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1360 fast_oop_rawmem = make_store(fast_oop_ctrl, store_eden_top, alloc_bytes_adr, |
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1361 0, new_alloc_bytes, T_LONG); |
0 | 1362 } |
1363 | |
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1364 InitializeNode* init = alloc->initialization(); |
0 | 1365 fast_oop_rawmem = initialize_object(alloc, |
1366 fast_oop_ctrl, fast_oop_rawmem, fast_oop, | |
1367 klass_node, length, size_in_bytes); | |
1368 | |
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1369 // If initialization is performed by an array copy, any required |
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1370 // MemBarStoreStore was already added. If the object does not |
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1371 // escape no need for a MemBarStoreStore. Otherwise we need a |
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1372 // MemBarStoreStore so that stores that initialize this object |
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1373 // can't be reordered with a subsequent store that makes this |
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1374 // object accessible by other threads. |
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1375 if (init == NULL || (!init->is_complete_with_arraycopy() && !init->does_not_escape())) { |
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1376 if (init == NULL || init->req() < InitializeNode::RawStores) { |
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1377 // No InitializeNode or no stores captured by zeroing |
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1378 // elimination. Simply add the MemBarStoreStore after object |
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1379 // initialization. |
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1380 MemBarNode* mb = MemBarNode::make(C, Op_MemBarStoreStore, Compile::AliasIdxBot); |
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1381 transform_later(mb); |
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1382 |
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1383 mb->init_req(TypeFunc::Memory, fast_oop_rawmem); |
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1384 mb->init_req(TypeFunc::Control, fast_oop_ctrl); |
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1385 fast_oop_ctrl = new (C) ProjNode(mb,TypeFunc::Control); |
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1386 transform_later(fast_oop_ctrl); |
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1387 fast_oop_rawmem = new (C) ProjNode(mb,TypeFunc::Memory); |
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1388 transform_later(fast_oop_rawmem); |
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1389 } else { |
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1390 // Add the MemBarStoreStore after the InitializeNode so that |
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1391 // all stores performing the initialization that were moved |
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1392 // before the InitializeNode happen before the storestore |
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1393 // barrier. |
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1394 |
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1395 Node* init_ctrl = init->proj_out(TypeFunc::Control); |
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1396 Node* init_mem = init->proj_out(TypeFunc::Memory); |
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1397 |
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1398 MemBarNode* mb = MemBarNode::make(C, Op_MemBarStoreStore, Compile::AliasIdxBot); |
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1399 transform_later(mb); |
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1400 |
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1401 Node* ctrl = new (C) ProjNode(init,TypeFunc::Control); |
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1402 transform_later(ctrl); |
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1403 Node* mem = new (C) ProjNode(init,TypeFunc::Memory); |
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1404 transform_later(mem); |
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1405 |
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1406 // The MemBarStoreStore depends on control and memory coming |
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1407 // from the InitializeNode |
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1408 mb->init_req(TypeFunc::Memory, mem); |
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1409 mb->init_req(TypeFunc::Control, ctrl); |
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1410 |
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1411 ctrl = new (C) ProjNode(mb,TypeFunc::Control); |
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1412 transform_later(ctrl); |
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1413 mem = new (C) ProjNode(mb,TypeFunc::Memory); |
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1414 transform_later(mem); |
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1415 |
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1416 // All nodes that depended on the InitializeNode for control |
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1417 // and memory must now depend on the MemBarNode that itself |
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1418 // depends on the InitializeNode |
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1419 _igvn.replace_node(init_ctrl, ctrl); |
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1420 _igvn.replace_node(init_mem, mem); |
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1421 } |
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1422 } |
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1423 |
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1424 if (C->env()->dtrace_extended_probes()) { |
0 | 1425 // Slow-path call |
1426 int size = TypeFunc::Parms + 2; | |
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1427 CallLeafNode *call = new (C) CallLeafNode(OptoRuntime::dtrace_object_alloc_Type(), |
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1428 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc_base), |
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1429 "dtrace_object_alloc", |
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1430 TypeRawPtr::BOTTOM); |
0 | 1431 |
1432 // Get base of thread-local storage area | |
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1433 Node* thread = new (C) ThreadLocalNode(); |
0 | 1434 transform_later(thread); |
1435 | |
1436 call->init_req(TypeFunc::Parms+0, thread); | |
1437 call->init_req(TypeFunc::Parms+1, fast_oop); | |
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1438 call->init_req(TypeFunc::Control, fast_oop_ctrl); |
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1439 call->init_req(TypeFunc::I_O , top()); // does no i/o |
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1440 call->init_req(TypeFunc::Memory , fast_oop_rawmem); |
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1441 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr)); |
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1442 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr)); |
0 | 1443 transform_later(call); |
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1444 fast_oop_ctrl = new (C) ProjNode(call,TypeFunc::Control); |
0 | 1445 transform_later(fast_oop_ctrl); |
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1446 fast_oop_rawmem = new (C) ProjNode(call,TypeFunc::Memory); |
0 | 1447 transform_later(fast_oop_rawmem); |
1448 } | |
1449 | |
1450 // Plug in the successful fast-path into the result merge point | |
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1451 result_region ->init_req(fast_result_path, fast_oop_ctrl); |
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1452 result_phi_rawoop->init_req(fast_result_path, fast_oop); |
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1453 result_phi_i_o ->init_req(fast_result_path, i_o); |
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1454 result_phi_rawmem->init_req(fast_result_path, fast_oop_rawmem); |
0 | 1455 } else { |
1456 slow_region = ctrl; | |
4767 | 1457 result_phi_i_o = i_o; // Rename it to use in the following code. |
0 | 1458 } |
1459 | |
1460 // Generate slow-path call | |
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1461 CallNode *call = new (C) CallStaticJavaNode(slow_call_type, slow_call_address, |
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1462 OptoRuntime::stub_name(slow_call_address), |
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1463 alloc->jvms()->bci(), |
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1464 TypePtr::BOTTOM); |
0 | 1465 call->init_req( TypeFunc::Control, slow_region ); |
1466 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1467 call->init_req( TypeFunc::Memory , slow_mem ); // may gc ptrs | |
1468 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1469 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1470 | |
1471 call->init_req(TypeFunc::Parms+0, klass_node); | |
1472 if (length != NULL) { | |
1473 call->init_req(TypeFunc::Parms+1, length); | |
1474 } | |
1475 | |
1476 // Copy debug information and adjust JVMState information, then replace | |
1477 // allocate node with the call | |
1478 copy_call_debug_info((CallNode *) alloc, call); | |
1479 if (!always_slow) { | |
1480 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
4767 | 1481 } else { |
1482 // Hook i_o projection to avoid its elimination during allocation | |
1483 // replacement (when only a slow call is generated). | |
1484 call->set_req(TypeFunc::I_O, result_phi_i_o); | |
0 | 1485 } |
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1486 _igvn.replace_node(alloc, call); |
0 | 1487 transform_later(call); |
1488 | |
1489 // Identify the output projections from the allocate node and | |
1490 // adjust any references to them. | |
1491 // The control and io projections look like: | |
1492 // | |
1493 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl) | |
1494 // Allocate Catch | |
1495 // ^---Proj(io) <-------+ ^---CatchProj(io) | |
1496 // | |
1497 // We are interested in the CatchProj nodes. | |
1498 // | |
1499 extract_call_projections(call); | |
1500 | |
4767 | 1501 // An allocate node has separate memory projections for the uses on |
1502 // the control and i_o paths. Replace the control memory projection with | |
1503 // result_phi_rawmem (unless we are only generating a slow call when | |
1504 // both memory projections are combined) | |
0 | 1505 if (!always_slow && _memproj_fallthrough != NULL) { |
1506 for (DUIterator_Fast imax, i = _memproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1507 Node *use = _memproj_fallthrough->fast_out(i); | |
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1508 _igvn.rehash_node_delayed(use); |
0 | 1509 imax -= replace_input(use, _memproj_fallthrough, result_phi_rawmem); |
1510 // back up iterator | |
1511 --i; | |
1512 } | |
1513 } | |
4767 | 1514 // Now change uses of _memproj_catchall to use _memproj_fallthrough and delete |
1515 // _memproj_catchall so we end up with a call that has only 1 memory projection. | |
0 | 1516 if (_memproj_catchall != NULL ) { |
1517 if (_memproj_fallthrough == NULL) { | |
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1518 _memproj_fallthrough = new (C) ProjNode(call, TypeFunc::Memory); |
0 | 1519 transform_later(_memproj_fallthrough); |
1520 } | |
1521 for (DUIterator_Fast imax, i = _memproj_catchall->fast_outs(imax); i < imax; i++) { | |
1522 Node *use = _memproj_catchall->fast_out(i); | |
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1523 _igvn.rehash_node_delayed(use); |
0 | 1524 imax -= replace_input(use, _memproj_catchall, _memproj_fallthrough); |
1525 // back up iterator | |
1526 --i; | |
1527 } | |
4767 | 1528 assert(_memproj_catchall->outcnt() == 0, "all uses must be deleted"); |
1529 _igvn.remove_dead_node(_memproj_catchall); | |
0 | 1530 } |
1531 | |
4767 | 1532 // An allocate node has separate i_o projections for the uses on the control |
1533 // and i_o paths. Always replace the control i_o projection with result i_o | |
1534 // otherwise incoming i_o become dead when only a slow call is generated | |
1535 // (it is different from memory projections where both projections are | |
1536 // combined in such case). | |
1537 if (_ioproj_fallthrough != NULL) { | |
0 | 1538 for (DUIterator_Fast imax, i = _ioproj_fallthrough->fast_outs(imax); i < imax; i++) { |
1539 Node *use = _ioproj_fallthrough->fast_out(i); | |
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1540 _igvn.rehash_node_delayed(use); |
0 | 1541 imax -= replace_input(use, _ioproj_fallthrough, result_phi_i_o); |
1542 // back up iterator | |
1543 --i; | |
1544 } | |
1545 } | |
4767 | 1546 // Now change uses of _ioproj_catchall to use _ioproj_fallthrough and delete |
1547 // _ioproj_catchall so we end up with a call that has only 1 i_o projection. | |
0 | 1548 if (_ioproj_catchall != NULL ) { |
4767 | 1549 if (_ioproj_fallthrough == NULL) { |
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1550 _ioproj_fallthrough = new (C) ProjNode(call, TypeFunc::I_O); |
4767 | 1551 transform_later(_ioproj_fallthrough); |
1552 } | |
0 | 1553 for (DUIterator_Fast imax, i = _ioproj_catchall->fast_outs(imax); i < imax; i++) { |
1554 Node *use = _ioproj_catchall->fast_out(i); | |
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1555 _igvn.rehash_node_delayed(use); |
0 | 1556 imax -= replace_input(use, _ioproj_catchall, _ioproj_fallthrough); |
1557 // back up iterator | |
1558 --i; | |
1559 } | |
4767 | 1560 assert(_ioproj_catchall->outcnt() == 0, "all uses must be deleted"); |
1561 _igvn.remove_dead_node(_ioproj_catchall); | |
0 | 1562 } |
1563 | |
1564 // if we generated only a slow call, we are done | |
4767 | 1565 if (always_slow) { |
1566 // Now we can unhook i_o. | |
4769 | 1567 if (result_phi_i_o->outcnt() > 1) { |
1568 call->set_req(TypeFunc::I_O, top()); | |
1569 } else { | |
1570 assert(result_phi_i_o->unique_ctrl_out() == call, ""); | |
1571 // Case of new array with negative size known during compilation. | |
1572 // AllocateArrayNode::Ideal() optimization disconnect unreachable | |
1573 // following code since call to runtime will throw exception. | |
1574 // As result there will be no users of i_o after the call. | |
1575 // Leave i_o attached to this call to avoid problems in preceding graph. | |
1576 } | |
0 | 1577 return; |
4767 | 1578 } |
0 | 1579 |
1580 | |
1581 if (_fallthroughcatchproj != NULL) { | |
1582 ctrl = _fallthroughcatchproj->clone(); | |
1583 transform_later(ctrl); | |
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1584 _igvn.replace_node(_fallthroughcatchproj, result_region); |
0 | 1585 } else { |
1586 ctrl = top(); | |
1587 } | |
1588 Node *slow_result; | |
1589 if (_resproj == NULL) { | |
1590 // no uses of the allocation result | |
1591 slow_result = top(); | |
1592 } else { | |
1593 slow_result = _resproj->clone(); | |
1594 transform_later(slow_result); | |
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1595 _igvn.replace_node(_resproj, result_phi_rawoop); |
0 | 1596 } |
1597 | |
1598 // Plug slow-path into result merge point | |
1599 result_region ->init_req( slow_result_path, ctrl ); | |
1600 result_phi_rawoop->init_req( slow_result_path, slow_result); | |
1601 result_phi_rawmem->init_req( slow_result_path, _memproj_fallthrough ); | |
1602 transform_later(result_region); | |
1603 transform_later(result_phi_rawoop); | |
1604 transform_later(result_phi_rawmem); | |
1605 transform_later(result_phi_i_o); | |
1606 // This completes all paths into the result merge point | |
1607 } | |
1608 | |
1609 | |
1610 // Helper for PhaseMacroExpand::expand_allocate_common. | |
1611 // Initializes the newly-allocated storage. | |
1612 Node* | |
1613 PhaseMacroExpand::initialize_object(AllocateNode* alloc, | |
1614 Node* control, Node* rawmem, Node* object, | |
1615 Node* klass_node, Node* length, | |
1616 Node* size_in_bytes) { | |
1617 InitializeNode* init = alloc->initialization(); | |
1618 // Store the klass & mark bits | |
1619 Node* mark_node = NULL; | |
1620 // For now only enable fast locking for non-array types | |
1621 if (UseBiasedLocking && (length == NULL)) { | |
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1622 mark_node = make_load(control, rawmem, klass_node, in_bytes(Klass::prototype_header_offset()), TypeRawPtr::BOTTOM, T_ADDRESS); |
0 | 1623 } else { |
1624 mark_node = makecon(TypeRawPtr::make((address)markOopDesc::prototype())); | |
1625 } | |
1626 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS); | |
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1627 |
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1628 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA); |
0 | 1629 int header_size = alloc->minimum_header_size(); // conservatively small |
1630 | |
1631 // Array length | |
1632 if (length != NULL) { // Arrays need length field | |
1633 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT); | |
1634 // conservatively small header size: | |
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1635 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE); |
0 | 1636 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass(); |
1637 if (k->is_array_klass()) // we know the exact header size in most cases: | |
1638 header_size = Klass::layout_helper_header_size(k->layout_helper()); | |
1639 } | |
1640 | |
1641 // Clear the object body, if necessary. | |
1642 if (init == NULL) { | |
1643 // The init has somehow disappeared; be cautious and clear everything. | |
1644 // | |
1645 // This can happen if a node is allocated but an uncommon trap occurs | |
1646 // immediately. In this case, the Initialize gets associated with the | |
1647 // trap, and may be placed in a different (outer) loop, if the Allocate | |
1648 // is in a loop. If (this is rare) the inner loop gets unrolled, then | |
1649 // there can be two Allocates to one Initialize. The answer in all these | |
1650 // edge cases is safety first. It is always safe to clear immediately | |
1651 // within an Allocate, and then (maybe or maybe not) clear some more later. | |
1652 if (!ZeroTLAB) | |
1653 rawmem = ClearArrayNode::clear_memory(control, rawmem, object, | |
1654 header_size, size_in_bytes, | |
1655 &_igvn); | |
1656 } else { | |
1657 if (!init->is_complete()) { | |
1658 // Try to win by zeroing only what the init does not store. | |
1659 // We can also try to do some peephole optimizations, | |
1660 // such as combining some adjacent subword stores. | |
1661 rawmem = init->complete_stores(control, rawmem, object, | |
1662 header_size, size_in_bytes, &_igvn); | |
1663 } | |
1664 // We have no more use for this link, since the AllocateNode goes away: | |
1665 init->set_req(InitializeNode::RawAddress, top()); | |
1666 // (If we keep the link, it just confuses the register allocator, | |
1667 // who thinks he sees a real use of the address by the membar.) | |
1668 } | |
1669 | |
1670 return rawmem; | |
1671 } | |
1672 | |
1673 // Generate prefetch instructions for next allocations. | |
1674 Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false, | |
1675 Node*& contended_phi_rawmem, | |
1676 Node* old_eden_top, Node* new_eden_top, | |
1677 Node* length) { | |
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1678 enum { fall_in_path = 1, pf_path = 2 }; |
0 | 1679 if( UseTLAB && AllocatePrefetchStyle == 2 ) { |
1680 // Generate prefetch allocation with watermark check. | |
1681 // As an allocation hits the watermark, we will prefetch starting | |
1682 // at a "distance" away from watermark. | |
1683 | |
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1684 Node *pf_region = new (C) RegionNode(3); |
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1685 Node *pf_phi_rawmem = new (C) PhiNode( pf_region, Type::MEMORY, |
0 | 1686 TypeRawPtr::BOTTOM ); |
1687 // I/O is used for Prefetch | |
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1688 Node *pf_phi_abio = new (C) PhiNode( pf_region, Type::ABIO ); |
0 | 1689 |
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1690 Node *thread = new (C) ThreadLocalNode(); |
0 | 1691 transform_later(thread); |
1692 | |
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1693 Node *eden_pf_adr = new (C) AddPNode( top()/*not oop*/, thread, |
0 | 1694 _igvn.MakeConX(in_bytes(JavaThread::tlab_pf_top_offset())) ); |
1695 transform_later(eden_pf_adr); | |
1696 | |
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1697 Node *old_pf_wm = new (C) LoadPNode( needgc_false, |
0 | 1698 contended_phi_rawmem, eden_pf_adr, |
1699 TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); | |
1700 transform_later(old_pf_wm); | |
1701 | |
1702 // check against new_eden_top | |
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1703 Node *need_pf_cmp = new (C) CmpPNode( new_eden_top, old_pf_wm ); |
0 | 1704 transform_later(need_pf_cmp); |
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1705 Node *need_pf_bol = new (C) BoolNode( need_pf_cmp, BoolTest::ge ); |
0 | 1706 transform_later(need_pf_bol); |
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1707 IfNode *need_pf_iff = new (C) IfNode( needgc_false, need_pf_bol, |
0 | 1708 PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); |
1709 transform_later(need_pf_iff); | |
1710 | |
1711 // true node, add prefetchdistance | |
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1712 Node *need_pf_true = new (C) IfTrueNode( need_pf_iff ); |
0 | 1713 transform_later(need_pf_true); |
1714 | |
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1715 Node *need_pf_false = new (C) IfFalseNode( need_pf_iff ); |
0 | 1716 transform_later(need_pf_false); |
1717 | |
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1718 Node *new_pf_wmt = new (C) AddPNode( top(), old_pf_wm, |
0 | 1719 _igvn.MakeConX(AllocatePrefetchDistance) ); |
1720 transform_later(new_pf_wmt ); | |
1721 new_pf_wmt->set_req(0, need_pf_true); | |
1722 | |
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1723 Node *store_new_wmt = new (C) StorePNode( need_pf_true, |
0 | 1724 contended_phi_rawmem, eden_pf_adr, |
1725 TypeRawPtr::BOTTOM, new_pf_wmt ); | |
1726 transform_later(store_new_wmt); | |
1727 | |
1728 // adding prefetches | |
1729 pf_phi_abio->init_req( fall_in_path, i_o ); | |
1730 | |
1731 Node *prefetch_adr; | |
1732 Node *prefetch; | |
1733 uint lines = AllocatePrefetchDistance / AllocatePrefetchStepSize; | |
1734 uint step_size = AllocatePrefetchStepSize; | |
1735 uint distance = 0; | |
1736 | |
1737 for ( uint i = 0; i < lines; i++ ) { | |
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1738 prefetch_adr = new (C) AddPNode( old_pf_wm, new_pf_wmt, |
0 | 1739 _igvn.MakeConX(distance) ); |
1740 transform_later(prefetch_adr); | |
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1741 prefetch = new (C) PrefetchAllocationNode( i_o, prefetch_adr ); |
0 | 1742 transform_later(prefetch); |
1743 distance += step_size; | |
1744 i_o = prefetch; | |
1745 } | |
1746 pf_phi_abio->set_req( pf_path, i_o ); | |
1747 | |
1748 pf_region->init_req( fall_in_path, need_pf_false ); | |
1749 pf_region->init_req( pf_path, need_pf_true ); | |
1750 | |
1751 pf_phi_rawmem->init_req( fall_in_path, contended_phi_rawmem ); | |
1752 pf_phi_rawmem->init_req( pf_path, store_new_wmt ); | |
1753 | |
1754 transform_later(pf_region); | |
1755 transform_later(pf_phi_rawmem); | |
1756 transform_later(pf_phi_abio); | |
1757 | |
1758 needgc_false = pf_region; | |
1759 contended_phi_rawmem = pf_phi_rawmem; | |
1760 i_o = pf_phi_abio; | |
1367
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1761 } else if( UseTLAB && AllocatePrefetchStyle == 3 ) { |
3854 | 1762 // Insert a prefetch for each allocation. |
1763 // This code is used for Sparc with BIS. | |
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1764 Node *pf_region = new (C) RegionNode(3); |
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1765 Node *pf_phi_rawmem = new (C) PhiNode( pf_region, Type::MEMORY, |
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1766 TypeRawPtr::BOTTOM ); |
1367
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1767 |
3854 | 1768 // Generate several prefetch instructions. |
1769 uint lines = (length != NULL) ? AllocatePrefetchLines : AllocateInstancePrefetchLines; | |
1367
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1770 uint step_size = AllocatePrefetchStepSize; |
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1771 uint distance = AllocatePrefetchDistance; |
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1772 |
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1773 // Next cache address. |
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1774 Node *cache_adr = new (C) AddPNode(old_eden_top, old_eden_top, |
1367
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1775 _igvn.MakeConX(distance)); |
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1776 transform_later(cache_adr); |
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1777 cache_adr = new (C) CastP2XNode(needgc_false, cache_adr); |
1367
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1778 transform_later(cache_adr); |
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1779 Node* mask = _igvn.MakeConX(~(intptr_t)(step_size-1)); |
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1780 cache_adr = new (C) AndXNode(cache_adr, mask); |
1367
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1781 transform_later(cache_adr); |
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1782 cache_adr = new (C) CastX2PNode(cache_adr); |
1367
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1783 transform_later(cache_adr); |
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1784 |
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1785 // Prefetch |
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1786 Node *prefetch = new (C) PrefetchAllocationNode( contended_phi_rawmem, cache_adr ); |
1367
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1787 prefetch->set_req(0, needgc_false); |
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1788 transform_later(prefetch); |
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1789 contended_phi_rawmem = prefetch; |
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1790 Node *prefetch_adr; |
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1791 distance = step_size; |
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1792 for ( uint i = 1; i < lines; i++ ) { |
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1793 prefetch_adr = new (C) AddPNode( cache_adr, cache_adr, |
1367
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1794 _igvn.MakeConX(distance) ); |
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1795 transform_later(prefetch_adr); |
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1796 prefetch = new (C) PrefetchAllocationNode( contended_phi_rawmem, prefetch_adr ); |
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1797 transform_later(prefetch); |
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1798 distance += step_size; |
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1799 contended_phi_rawmem = prefetch; |
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1800 } |
0 | 1801 } else if( AllocatePrefetchStyle > 0 ) { |
1802 // Insert a prefetch for each allocation only on the fast-path | |
1803 Node *prefetch_adr; | |
1804 Node *prefetch; | |
3854 | 1805 // Generate several prefetch instructions. |
1806 uint lines = (length != NULL) ? AllocatePrefetchLines : AllocateInstancePrefetchLines; | |
0 | 1807 uint step_size = AllocatePrefetchStepSize; |
1808 uint distance = AllocatePrefetchDistance; | |
1809 for ( uint i = 0; i < lines; i++ ) { | |
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1810 prefetch_adr = new (C) AddPNode( old_eden_top, new_eden_top, |
0 | 1811 _igvn.MakeConX(distance) ); |
1812 transform_later(prefetch_adr); | |
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1813 prefetch = new (C) PrefetchAllocationNode( i_o, prefetch_adr ); |
0 | 1814 // Do not let it float too high, since if eden_top == eden_end, |
1815 // both might be null. | |
1816 if( i == 0 ) { // Set control for first prefetch, next follows it | |
1817 prefetch->init_req(0, needgc_false); | |
1818 } | |
1819 transform_later(prefetch); | |
1820 distance += step_size; | |
1821 i_o = prefetch; | |
1822 } | |
1823 } | |
1824 return i_o; | |
1825 } | |
1826 | |
1827 | |
1828 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) { | |
1829 expand_allocate_common(alloc, NULL, | |
1830 OptoRuntime::new_instance_Type(), | |
1831 OptoRuntime::new_instance_Java()); | |
1832 } | |
1833 | |
1834 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) { | |
1835 Node* length = alloc->in(AllocateNode::ALength); | |
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1836 InitializeNode* init = alloc->initialization(); |
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1837 Node* klass_node = alloc->in(AllocateNode::KlassNode); |
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1838 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass(); |
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1839 address slow_call_address; // Address of slow call |
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1840 if (init != NULL && init->is_complete_with_arraycopy() && |
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1841 k->is_type_array_klass()) { |
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1842 // Don't zero type array during slow allocation in VM since |
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1843 // it will be initialized later by arraycopy in compiled code. |
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1844 slow_call_address = OptoRuntime::new_array_nozero_Java(); |
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1845 } else { |
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1846 slow_call_address = OptoRuntime::new_array_Java(); |
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1847 } |
0 | 1848 expand_allocate_common(alloc, length, |
1849 OptoRuntime::new_array_Type(), | |
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1850 slow_call_address); |
0 | 1851 } |
1852 | |
4777 | 1853 //-------------------mark_eliminated_box---------------------------------- |
1854 // | |
3754
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1855 // During EA obj may point to several objects but after few ideal graph |
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1856 // transformations (CCP) it may point to only one non escaping object |
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1857 // (but still using phi), corresponding locks and unlocks will be marked |
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1858 // for elimination. Later obj could be replaced with a new node (new phi) |
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1859 // and which does not have escape information. And later after some graph |
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1860 // reshape other locks and unlocks (which were not marked for elimination |
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1861 // before) are connected to this new obj (phi) but they still will not be |
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1862 // marked for elimination since new obj has no escape information. |
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1863 // Mark all associated (same box and obj) lock and unlock nodes for |
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1864 // elimination if some of them marked already. |
4777 | 1865 void PhaseMacroExpand::mark_eliminated_box(Node* oldbox, Node* obj) { |
4792 | 1866 if (oldbox->as_BoxLock()->is_eliminated()) |
1867 return; // This BoxLock node was processed already. | |
4777 | 1868 |
4792 | 1869 // New implementation (EliminateNestedLocks) has separate BoxLock |
1870 // node for each locked region so mark all associated locks/unlocks as | |
1871 // eliminated even if different objects are referenced in one locked region | |
1872 // (for example, OSR compilation of nested loop inside locked scope). | |
1873 if (EliminateNestedLocks || | |
4777 | 1874 oldbox->as_BoxLock()->is_simple_lock_region(NULL, obj)) { |
1875 // Box is used only in one lock region. Mark this box as eliminated. | |
1876 _igvn.hash_delete(oldbox); | |
1877 oldbox->as_BoxLock()->set_eliminated(); // This changes box's hash value | |
1878 _igvn.hash_insert(oldbox); | |
1879 | |
1880 for (uint i = 0; i < oldbox->outcnt(); i++) { | |
1881 Node* u = oldbox->raw_out(i); | |
1882 if (u->is_AbstractLock() && !u->as_AbstractLock()->is_non_esc_obj()) { | |
1883 AbstractLockNode* alock = u->as_AbstractLock(); | |
1884 // Check lock's box since box could be referenced by Lock's debug info. | |
1885 if (alock->box_node() == oldbox) { | |
1886 // Mark eliminated all related locks and unlocks. | |
1887 alock->set_non_esc_obj(); | |
1888 } | |
1889 } | |
1890 } | |
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1891 return; |
66
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1892 } |
4777 | 1893 |
1894 // Create new "eliminated" BoxLock node and use it in monitor debug info | |
1895 // instead of oldbox for the same object. | |
4790
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1896 BoxLockNode* newbox = oldbox->clone()->as_BoxLock(); |
4777 | 1897 |
1898 // Note: BoxLock node is marked eliminated only here and it is used | |
1899 // to indicate that all associated lock and unlock nodes are marked | |
1900 // for elimination. | |
1901 newbox->set_eliminated(); | |
1902 transform_later(newbox); | |
1903 | |
1904 // Replace old box node with new box for all users of the same object. | |
1905 for (uint i = 0; i < oldbox->outcnt();) { | |
1906 bool next_edge = true; | |
1907 | |
1908 Node* u = oldbox->raw_out(i); | |
1909 if (u->is_AbstractLock()) { | |
1910 AbstractLockNode* alock = u->as_AbstractLock(); | |
4778 | 1911 if (alock->box_node() == oldbox && alock->obj_node()->eqv_uncast(obj)) { |
4777 | 1912 // Replace Box and mark eliminated all related locks and unlocks. |
1913 alock->set_non_esc_obj(); | |
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1914 _igvn.rehash_node_delayed(alock); |
4777 | 1915 alock->set_box_node(newbox); |
1916 next_edge = false; | |
1917 } | |
1918 } | |
4778 | 1919 if (u->is_FastLock() && u->as_FastLock()->obj_node()->eqv_uncast(obj)) { |
4777 | 1920 FastLockNode* flock = u->as_FastLock(); |
1921 assert(flock->box_node() == oldbox, "sanity"); | |
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1922 _igvn.rehash_node_delayed(flock); |
4777 | 1923 flock->set_box_node(newbox); |
1924 next_edge = false; | |
1925 } | |
1926 | |
1927 // Replace old box in monitor debug info. | |
1928 if (u->is_SafePoint() && u->as_SafePoint()->jvms()) { | |
1929 SafePointNode* sfn = u->as_SafePoint(); | |
1930 JVMState* youngest_jvms = sfn->jvms(); | |
1931 int max_depth = youngest_jvms->depth(); | |
1932 for (int depth = 1; depth <= max_depth; depth++) { | |
1933 JVMState* jvms = youngest_jvms->of_depth(depth); | |
1934 int num_mon = jvms->nof_monitors(); | |
1935 // Loop over monitors | |
1936 for (int idx = 0; idx < num_mon; idx++) { | |
1937 Node* obj_node = sfn->monitor_obj(jvms, idx); | |
1938 Node* box_node = sfn->monitor_box(jvms, idx); | |
4778 | 1939 if (box_node == oldbox && obj_node->eqv_uncast(obj)) { |
4777 | 1940 int j = jvms->monitor_box_offset(idx); |
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1941 _igvn.replace_input_of(u, j, newbox); |
4777 | 1942 next_edge = false; |
1943 } | |
1944 } | |
1945 } | |
1946 } | |
1947 if (next_edge) i++; | |
1948 } | |
1949 } | |
1950 | |
1951 //-----------------------mark_eliminated_locking_nodes----------------------- | |
1952 void PhaseMacroExpand::mark_eliminated_locking_nodes(AbstractLockNode *alock) { | |
1953 if (EliminateNestedLocks) { | |
1954 if (alock->is_nested()) { | |
1955 assert(alock->box_node()->as_BoxLock()->is_eliminated(), "sanity"); | |
1956 return; | |
1957 } else if (!alock->is_non_esc_obj()) { // Not eliminated or coarsened | |
1958 // Only Lock node has JVMState needed here. | |
1959 if (alock->jvms() != NULL && alock->as_Lock()->is_nested_lock_region()) { | |
1960 // Mark eliminated related nested locks and unlocks. | |
1961 Node* obj = alock->obj_node(); | |
1962 BoxLockNode* box_node = alock->box_node()->as_BoxLock(); | |
1963 assert(!box_node->is_eliminated(), "should not be marked yet"); | |
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1964 // Note: BoxLock node is marked eliminated only here |
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1965 // and it is used to indicate that all associated lock |
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1966 // and unlock nodes are marked for elimination. |
4777 | 1967 box_node->set_eliminated(); // Box's hash is always NO_HASH here |
1968 for (uint i = 0; i < box_node->outcnt(); i++) { | |
1969 Node* u = box_node->raw_out(i); | |
1970 if (u->is_AbstractLock()) { | |
1971 alock = u->as_AbstractLock(); | |
1972 if (alock->box_node() == box_node) { | |
1973 // Verify that this Box is referenced only by related locks. | |
4778 | 1974 assert(alock->obj_node()->eqv_uncast(obj), ""); |
4777 | 1975 // Mark all related locks and unlocks. |
1976 alock->set_nested(); | |
1977 } | |
460
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1978 } |
4777 | 1979 } |
1980 } | |
1981 return; | |
1982 } | |
1983 // Process locks for non escaping object | |
1984 assert(alock->is_non_esc_obj(), ""); | |
1985 } // EliminateNestedLocks | |
1986 | |
1987 if (alock->is_non_esc_obj()) { // Lock is used for non escaping object | |
1988 // Look for all locks of this object and mark them and | |
1989 // corresponding BoxLock nodes as eliminated. | |
1990 Node* obj = alock->obj_node(); | |
1991 for (uint j = 0; j < obj->outcnt(); j++) { | |
1992 Node* o = obj->raw_out(j); | |
4778 | 1993 if (o->is_AbstractLock() && |
1994 o->as_AbstractLock()->obj_node()->eqv_uncast(obj)) { | |
4777 | 1995 alock = o->as_AbstractLock(); |
1996 Node* box = alock->box_node(); | |
1997 // Replace old box node with new eliminated box for all users | |
1998 // of the same object and mark related locks as eliminated. | |
1999 mark_eliminated_box(box, obj); | |
2000 } | |
2001 } | |
2002 } | |
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2003 } |
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2004 |
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2005 // we have determined that this lock/unlock can be eliminated, we simply |
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2006 // eliminate the node without expanding it. |
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2007 // |
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2008 // Note: The membar's associated with the lock/unlock are currently not |
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2009 // eliminated. This should be investigated as a future enhancement. |
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2010 // |
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2011 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) { |
66
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2012 |
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2013 if (!alock->is_eliminated()) { |
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2014 return false; |
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2015 } |
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2016 #ifdef ASSERT |
4777 | 2017 if (!alock->is_coarsened()) { |
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2018 // Check that new "eliminated" BoxLock node is created. |
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2019 BoxLockNode* oldbox = alock->box_node()->as_BoxLock(); |
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2020 assert(oldbox->is_eliminated(), "should be done already"); |
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2021 } |
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2022 #endif |
1080
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2023 CompileLog* log = C->log(); |
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2024 if (log != NULL) { |
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2025 log->head("eliminate_lock lock='%d'", |
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|
2026 alock->is_Lock()); |
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|
2027 JVMState* p = alock->jvms(); |
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|
2028 while (p != NULL) { |
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|
2029 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); |
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|
2030 p = p->caller(); |
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|
2031 } |
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|
2032 log->tail("eliminate_lock"); |
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|
2033 } |
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|
2034 |
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2035 #ifndef PRODUCT |
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2036 if (PrintEliminateLocks) { |
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|
2037 if (alock->is_Lock()) { |
4115 | 2038 tty->print_cr("++++ Eliminated: %d Lock", alock->_idx); |
66
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2039 } else { |
4115 | 2040 tty->print_cr("++++ Eliminated: %d Unlock", alock->_idx); |
66
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2041 } |
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|
2042 } |
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2043 #endif |
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|
2044 |
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2045 Node* mem = alock->in(TypeFunc::Memory); |
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2046 Node* ctrl = alock->in(TypeFunc::Control); |
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|
2047 |
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|
2048 extract_call_projections(alock); |
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2049 // There are 2 projections from the lock. The lock node will |
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2050 // be deleted when its last use is subsumed below. |
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2051 assert(alock->outcnt() == 2 && |
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2052 _fallthroughproj != NULL && |
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|
2053 _memproj_fallthrough != NULL, |
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|
2054 "Unexpected projections from Lock/Unlock"); |
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|
2055 |
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|
2056 Node* fallthroughproj = _fallthroughproj; |
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|
2057 Node* memproj_fallthrough = _memproj_fallthrough; |
0 | 2058 |
2059 // The memory projection from a lock/unlock is RawMem | |
2060 // The input to a Lock is merged memory, so extract its RawMem input | |
2061 // (unless the MergeMem has been optimized away.) | |
2062 if (alock->is_Lock()) { | |
3849
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2063 // Seach for MemBarAcquireLock node and delete it also. |
66
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2064 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar(); |
3849
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2065 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquireLock, ""); |
66
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2066 Node* ctrlproj = membar->proj_out(TypeFunc::Control); |
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2067 Node* memproj = membar->proj_out(TypeFunc::Memory); |
708
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2068 _igvn.replace_node(ctrlproj, fallthroughproj); |
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2069 _igvn.replace_node(memproj, memproj_fallthrough); |
460
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2070 |
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2071 // Delete FastLock node also if this Lock node is unique user |
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2072 // (a loop peeling may clone a Lock node). |
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2073 Node* flock = alock->as_Lock()->fastlock_node(); |
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2074 if (flock->outcnt() == 1) { |
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2075 assert(flock->unique_out() == alock, "sanity"); |
708
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|
2076 _igvn.replace_node(flock, top()); |
460
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2077 } |
0 | 2078 } |
2079 | |
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2080 // Seach for MemBarReleaseLock node and delete it also. |
66
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2081 if (alock->is_Unlock() && ctrl != NULL && ctrl->is_Proj() && |
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2082 ctrl->in(0)->is_MemBar()) { |
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2083 MemBarNode* membar = ctrl->in(0)->as_MemBar(); |
3849
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2084 assert(membar->Opcode() == Op_MemBarReleaseLock && |
66
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2085 mem->is_Proj() && membar == mem->in(0), ""); |
708
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2086 _igvn.replace_node(fallthroughproj, ctrl); |
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2087 _igvn.replace_node(memproj_fallthrough, mem); |
66
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2088 fallthroughproj = ctrl; |
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2089 memproj_fallthrough = mem; |
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|
2090 ctrl = membar->in(TypeFunc::Control); |
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2091 mem = membar->in(TypeFunc::Memory); |
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2092 } |
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|
2093 |
708
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|
2094 _igvn.replace_node(fallthroughproj, ctrl); |
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|
2095 _igvn.replace_node(memproj_fallthrough, mem); |
66
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2096 return true; |
0 | 2097 } |
2098 | |
2099 | |
2100 //------------------------------expand_lock_node---------------------- | |
2101 void PhaseMacroExpand::expand_lock_node(LockNode *lock) { | |
2102 | |
2103 Node* ctrl = lock->in(TypeFunc::Control); | |
2104 Node* mem = lock->in(TypeFunc::Memory); | |
2105 Node* obj = lock->obj_node(); | |
2106 Node* box = lock->box_node(); | |
66
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2107 Node* flock = lock->fastlock_node(); |
0 | 2108 |
4790
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|
2109 assert(!box->as_BoxLock()->is_eliminated(), "sanity"); |
4777 | 2110 |
0 | 2111 // Make the merge point |
420
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|
2112 Node *region; |
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|
2113 Node *mem_phi; |
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|
2114 Node *slow_path; |
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2115 |
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|
2116 if (UseOptoBiasInlining) { |
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2117 /* |
605 | 2118 * See the full description in MacroAssembler::biased_locking_enter(). |
420
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|
2119 * |
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2120 * if( (mark_word & biased_lock_mask) == biased_lock_pattern ) { |
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|
2121 * // The object is biased. |
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2122 * proto_node = klass->prototype_header; |
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2123 * o_node = thread | proto_node; |
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2124 * x_node = o_node ^ mark_word; |
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2125 * if( (x_node & ~age_mask) == 0 ) { // Biased to the current thread ? |
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|
2126 * // Done. |
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|
2127 * } else { |
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2128 * if( (x_node & biased_lock_mask) != 0 ) { |
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2129 * // The klass's prototype header is no longer biased. |
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|
2130 * cas(&mark_word, mark_word, proto_node) |
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|
2131 * goto cas_lock; |
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|
2132 * } else { |
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2133 * // The klass's prototype header is still biased. |
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2134 * if( (x_node & epoch_mask) != 0 ) { // Expired epoch? |
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2135 * old = mark_word; |
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|
2136 * new = o_node; |
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|
2137 * } else { |
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|
2138 * // Different thread or anonymous biased. |
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2139 * old = mark_word & (epoch_mask | age_mask | biased_lock_mask); |
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|
2140 * new = thread | old; |
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|
2141 * } |
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2142 * // Try to rebias. |
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2143 * if( cas(&mark_word, old, new) == 0 ) { |
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|
2144 * // Done. |
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|
2145 * } else { |
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|
2146 * goto slow_path; // Failed. |
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6462850: generate biased locking code in C2 ideal graph
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|
2147 * } |
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|
2148 * } |
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|
2149 * } |
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|
2150 * } else { |
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|
2151 * // The object is not biased. |
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|
2152 * cas_lock: |
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|
2153 * if( FastLock(obj) == 0 ) { |
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|
2154 * // Done. |
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|
2155 * } else { |
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|
2156 * slow_path: |
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|
2157 * OptoRuntime::complete_monitor_locking_Java(obj); |
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6462850: generate biased locking code in C2 ideal graph
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|
2158 * } |
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|
2159 * } |
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|
2160 */ |
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|
2161 |
6804
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|
2162 region = new (C) RegionNode(5); |
420
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2163 // create a Phi for the memory state |
6804
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2164 mem_phi = new (C) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
420
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2165 |
6804
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2166 Node* fast_lock_region = new (C) RegionNode(3); |
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2167 Node* fast_lock_mem_phi = new (C) PhiNode( fast_lock_region, Type::MEMORY, TypeRawPtr::BOTTOM); |
420
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|
2168 |
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2169 // First, check mark word for the biased lock pattern. |
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2170 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
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|
2171 |
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2172 // Get fast path - mark word has the biased lock pattern. |
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2173 ctrl = opt_bits_test(ctrl, fast_lock_region, 1, mark_node, |
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2174 markOopDesc::biased_lock_mask_in_place, |
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|
2175 markOopDesc::biased_lock_pattern, true); |
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2176 // fast_lock_region->in(1) is set to slow path. |
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changeset
|
2177 fast_lock_mem_phi->init_req(1, mem); |
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|
2178 |
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|
2179 // Now check that the lock is biased to the current thread and has |
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2180 // the same epoch and bias as Klass::_prototype_header. |
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|
2181 |
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2182 // Special-case a fresh allocation to avoid building nodes: |
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|
2183 Node* klass_node = AllocateNode::Ideal_klass(obj, &_igvn); |
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|
2184 if (klass_node == NULL) { |
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|
2185 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); |
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2186 klass_node = transform_later( LoadKlassNode::make(_igvn, mem, k_adr, _igvn.type(k_adr)->is_ptr()) ); |
490
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|
2187 #ifdef _LP64 |
6848
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7054512: Compress class pointers after perm gen removal
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diff
changeset
|
2188 if (UseCompressedKlassPointers && klass_node->is_DecodeNKlass()) { |
490
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2189 assert(klass_node->in(1)->Opcode() == Op_LoadNKlass, "sanity"); |
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2190 klass_node->in(1)->init_req(0, ctrl); |
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|
2191 } else |
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changeset
|
2192 #endif |
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changeset
|
2193 klass_node->init_req(0, ctrl); |
420
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|
2194 } |
4762
069ab3f976d3
7118863: Move sizeof(klassOopDesc) into the *Klass::*_offset_in_bytes() functions
stefank
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diff
changeset
|
2195 Node *proto_node = make_load(ctrl, mem, klass_node, in_bytes(Klass::prototype_header_offset()), TypeX_X, TypeX_X->basic_type()); |
420
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|
2196 |
6804
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changeset
|
2197 Node* thread = transform_later(new (C) ThreadLocalNode()); |
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|
2198 Node* cast_thread = transform_later(new (C) CastP2XNode(ctrl, thread)); |
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2199 Node* o_node = transform_later(new (C) OrXNode(cast_thread, proto_node)); |
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|
2200 Node* x_node = transform_later(new (C) XorXNode(o_node, mark_node)); |
420
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|
2201 |
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2202 // Get slow path - mark word does NOT match the value. |
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|
2203 Node* not_biased_ctrl = opt_bits_test(ctrl, region, 3, x_node, |
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|
2204 (~markOopDesc::age_mask_in_place), 0); |
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2205 // region->in(3) is set to fast path - the object is biased to the current thread. |
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changeset
|
2206 mem_phi->init_req(3, mem); |
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changeset
|
2207 |
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|
2208 |
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|
2209 // Mark word does NOT match the value (thread | Klass::_prototype_header). |
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|
2210 |
0 | 2211 |
420
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|
2212 // First, check biased pattern. |
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2213 // Get fast path - _prototype_header has the same biased lock pattern. |
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changeset
|
2214 ctrl = opt_bits_test(not_biased_ctrl, fast_lock_region, 2, x_node, |
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|
2215 markOopDesc::biased_lock_mask_in_place, 0, true); |
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|
2216 |
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|
2217 not_biased_ctrl = fast_lock_region->in(2); // Slow path |
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|
2218 // fast_lock_region->in(2) - the prototype header is no longer biased |
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changeset
|
2219 // and we have to revoke the bias on this object. |
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|
2220 // We are going to try to reset the mark of this object to the prototype |
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|
2221 // value and fall through to the CAS-based locking scheme. |
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|
2222 Node* adr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes()); |
6804
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2223 Node* cas = new (C) StoreXConditionalNode(not_biased_ctrl, mem, adr, |
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|
2224 proto_node, mark_node); |
420
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|
2225 transform_later(cas); |
6804
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changeset
|
2226 Node* proj = transform_later( new (C) SCMemProjNode(cas)); |
420
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|
2227 fast_lock_mem_phi->init_req(2, proj); |
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|
2228 |
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|
2229 |
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|
2230 // Second, check epoch bits. |
6804
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|
2231 Node* rebiased_region = new (C) RegionNode(3); |
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|
2232 Node* old_phi = new (C) PhiNode( rebiased_region, TypeX_X); |
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changeset
|
2233 Node* new_phi = new (C) PhiNode( rebiased_region, TypeX_X); |
420
a1980da045cc
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diff
changeset
|
2234 |
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|
2235 // Get slow path - mark word does NOT match epoch bits. |
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|
2236 Node* epoch_ctrl = opt_bits_test(ctrl, rebiased_region, 1, x_node, |
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|
2237 markOopDesc::epoch_mask_in_place, 0); |
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|
2238 // The epoch of the current bias is not valid, attempt to rebias the object |
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diff
changeset
|
2239 // toward the current thread. |
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changeset
|
2240 rebiased_region->init_req(2, epoch_ctrl); |
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diff
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|
2241 old_phi->init_req(2, mark_node); |
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diff
changeset
|
2242 new_phi->init_req(2, o_node); |
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diff
changeset
|
2243 |
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|
2244 // rebiased_region->in(1) is set to fast path. |
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diff
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|
2245 // The epoch of the current bias is still valid but we know |
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|
2246 // nothing about the owner; it might be set or it might be clear. |
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changeset
|
2247 Node* cmask = MakeConX(markOopDesc::biased_lock_mask_in_place | |
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|
2248 markOopDesc::age_mask_in_place | |
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2249 markOopDesc::epoch_mask_in_place); |
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2250 Node* old = transform_later(new (C) AndXNode(mark_node, cmask)); |
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2251 cast_thread = transform_later(new (C) CastP2XNode(ctrl, thread)); |
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2252 Node* new_mark = transform_later(new (C) OrXNode(cast_thread, old)); |
420
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2253 old_phi->init_req(1, old); |
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2254 new_phi->init_req(1, new_mark); |
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2255 |
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2256 transform_later(rebiased_region); |
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2257 transform_later(old_phi); |
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2258 transform_later(new_phi); |
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2259 |
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2260 // Try to acquire the bias of the object using an atomic operation. |
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2261 // If this fails we will go in to the runtime to revoke the object's bias. |
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2262 cas = new (C) StoreXConditionalNode(rebiased_region, mem, adr, |
420
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2263 new_phi, old_phi); |
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2264 transform_later(cas); |
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2265 proj = transform_later( new (C) SCMemProjNode(cas)); |
420
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2266 |
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2267 // Get slow path - Failed to CAS. |
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2268 not_biased_ctrl = opt_bits_test(rebiased_region, region, 4, cas, 0, 0); |
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2269 mem_phi->init_req(4, proj); |
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2270 // region->in(4) is set to fast path - the object is rebiased to the current thread. |
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2271 |
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2272 // Failed to CAS. |
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2273 slow_path = new (C) RegionNode(3); |
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2274 Node *slow_mem = new (C) PhiNode( slow_path, Type::MEMORY, TypeRawPtr::BOTTOM); |
420
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2275 |
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2276 slow_path->init_req(1, not_biased_ctrl); // Capture slow-control |
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2277 slow_mem->init_req(1, proj); |
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2278 |
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2279 // Call CAS-based locking scheme (FastLock node). |
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2280 |
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2281 transform_later(fast_lock_region); |
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2282 transform_later(fast_lock_mem_phi); |
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2283 |
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2284 // Get slow path - FastLock failed to lock the object. |
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2285 ctrl = opt_bits_test(fast_lock_region, region, 2, flock, 0, 0); |
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2286 mem_phi->init_req(2, fast_lock_mem_phi); |
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2287 // region->in(2) is set to fast path - the object is locked to the current thread. |
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2288 |
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2289 slow_path->init_req(2, ctrl); // Capture slow-control |
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2290 slow_mem->init_req(2, fast_lock_mem_phi); |
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2291 |
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2292 transform_later(slow_path); |
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2293 transform_later(slow_mem); |
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2294 // Reset lock's memory edge. |
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2295 lock->set_req(TypeFunc::Memory, slow_mem); |
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2296 |
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2297 } else { |
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2298 region = new (C) RegionNode(3); |
420
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2299 // create a Phi for the memory state |
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2300 mem_phi = new (C) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
420
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2301 |
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2302 // Optimize test; set region slot 2 |
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2303 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0); |
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2304 mem_phi->init_req(2, mem); |
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2305 } |
0 | 2306 |
2307 // Make slow path call | |
2308 CallNode *call = make_slow_call( (CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(), OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path, obj, box ); | |
2309 | |
2310 extract_call_projections(call); | |
2311 | |
2312 // Slow path can only throw asynchronous exceptions, which are always | |
2313 // de-opted. So the compiler thinks the slow-call can never throw an | |
2314 // exception. If it DOES throw an exception we would need the debug | |
2315 // info removed first (since if it throws there is no monitor). | |
2316 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
2317 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
2318 | |
2319 // Capture slow path | |
2320 // disconnect fall-through projection from call and create a new one | |
2321 // hook up users of fall-through projection to region | |
2322 Node *slow_ctrl = _fallthroughproj->clone(); | |
2323 transform_later(slow_ctrl); | |
2324 _igvn.hash_delete(_fallthroughproj); | |
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2325 _fallthroughproj->disconnect_inputs(NULL, C); |
0 | 2326 region->init_req(1, slow_ctrl); |
2327 // region inputs are now complete | |
2328 transform_later(region); | |
708
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2329 _igvn.replace_node(_fallthroughproj, region); |
0 | 2330 |
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2331 Node *memproj = transform_later( new(C) ProjNode(call, TypeFunc::Memory) ); |
0 | 2332 mem_phi->init_req(1, memproj ); |
2333 transform_later(mem_phi); | |
708
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2334 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 2335 } |
2336 | |
2337 //------------------------------expand_unlock_node---------------------- | |
2338 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) { | |
2339 | |
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2340 Node* ctrl = unlock->in(TypeFunc::Control); |
0 | 2341 Node* mem = unlock->in(TypeFunc::Memory); |
2342 Node* obj = unlock->obj_node(); | |
2343 Node* box = unlock->box_node(); | |
2344 | |
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2345 assert(!box->as_BoxLock()->is_eliminated(), "sanity"); |
4777 | 2346 |
0 | 2347 // No need for a null check on unlock |
2348 | |
2349 // Make the merge point | |
420
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2350 Node *region; |
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2351 Node *mem_phi; |
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2352 |
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2353 if (UseOptoBiasInlining) { |
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2354 // Check for biased locking unlock case, which is a no-op. |
605 | 2355 // See the full description in MacroAssembler::biased_locking_exit(). |
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2356 region = new (C) RegionNode(4); |
420
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2357 // create a Phi for the memory state |
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2358 mem_phi = new (C) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
420
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|
2359 mem_phi->init_req(3, mem); |
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2360 |
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2361 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
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2362 ctrl = opt_bits_test(ctrl, region, 3, mark_node, |
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2363 markOopDesc::biased_lock_mask_in_place, |
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|
2364 markOopDesc::biased_lock_pattern); |
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|
2365 } else { |
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2366 region = new (C) RegionNode(3); |
420
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2367 // create a Phi for the memory state |
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2368 mem_phi = new (C) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
420
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2369 } |
0 | 2370 |
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2371 FastUnlockNode *funlock = new (C) FastUnlockNode( ctrl, obj, box ); |
0 | 2372 funlock = transform_later( funlock )->as_FastUnlock(); |
2373 // Optimize test; set region slot 2 | |
420
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2374 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0); |
0 | 2375 |
2376 CallNode *call = make_slow_call( (CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C), "complete_monitor_unlocking_C", slow_path, obj, box ); | |
2377 | |
2378 extract_call_projections(call); | |
2379 | |
2380 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
2381 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
2382 | |
2383 // No exceptions for unlocking | |
2384 // Capture slow path | |
2385 // disconnect fall-through projection from call and create a new one | |
2386 // hook up users of fall-through projection to region | |
2387 Node *slow_ctrl = _fallthroughproj->clone(); | |
2388 transform_later(slow_ctrl); | |
2389 _igvn.hash_delete(_fallthroughproj); | |
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2390 _fallthroughproj->disconnect_inputs(NULL, C); |
0 | 2391 region->init_req(1, slow_ctrl); |
2392 // region inputs are now complete | |
2393 transform_later(region); | |
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2394 _igvn.replace_node(_fallthroughproj, region); |
0 | 2395 |
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2396 Node *memproj = transform_later( new(C) ProjNode(call, TypeFunc::Memory) ); |
0 | 2397 mem_phi->init_req(1, memproj ); |
2398 mem_phi->init_req(2, mem); | |
2399 transform_later(mem_phi); | |
708
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2400 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 2401 } |
2402 | |
4115 | 2403 //---------------------------eliminate_macro_nodes---------------------- |
2404 // Eliminate scalar replaced allocations and associated locks. | |
2405 void PhaseMacroExpand::eliminate_macro_nodes() { | |
0 | 2406 if (C->macro_count() == 0) |
4115 | 2407 return; |
2408 | |
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2409 // First, attempt to eliminate locks |
3754
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2410 int cnt = C->macro_count(); |
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2411 for (int i=0; i < cnt; i++) { |
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2412 Node *n = C->macro_node(i); |
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2413 if (n->is_AbstractLock()) { // Lock and Unlock nodes |
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2414 // Before elimination mark all associated (same box and obj) |
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2415 // lock and unlock nodes. |
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2416 mark_eliminated_locking_nodes(n->as_AbstractLock()); |
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2417 } |
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2418 } |
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2419 bool progress = true; |
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2420 while (progress) { |
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2421 progress = false; |
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2422 for (int i = C->macro_count(); i > 0; i--) { |
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2423 Node * n = C->macro_node(i-1); |
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2424 bool success = false; |
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2425 debug_only(int old_macro_count = C->macro_count();); |
460
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2426 if (n->is_AbstractLock()) { |
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2427 success = eliminate_locking_node(n->as_AbstractLock()); |
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2428 } |
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2429 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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2430 progress = progress || success; |
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2431 } |
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2432 } |
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2433 // Next, attempt to eliminate allocations |
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2434 progress = true; |
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2435 while (progress) { |
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2436 progress = false; |
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2437 for (int i = C->macro_count(); i > 0; i--) { |
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2438 Node * n = C->macro_node(i-1); |
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2439 bool success = false; |
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2440 debug_only(int old_macro_count = C->macro_count();); |
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2441 switch (n->class_id()) { |
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2442 case Node::Class_Allocate: |
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2443 case Node::Class_AllocateArray: |
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2444 success = eliminate_allocate_node(n->as_Allocate()); |
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2445 break; |
10278 | 2446 case Node::Class_CallStaticJava: |
2447 success = eliminate_boxing_node(n->as_CallStaticJava()); | |
2448 break; | |
73
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2449 case Node::Class_Lock: |
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2450 case Node::Class_Unlock: |
460
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2451 assert(!n->as_AbstractLock()->is_eliminated(), "sanity"); |
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2452 break; |
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2453 default: |
4115 | 2454 assert(n->Opcode() == Op_LoopLimit || |
2455 n->Opcode() == Op_Opaque1 || | |
2456 n->Opcode() == Op_Opaque2, "unknown node type in macro list"); | |
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2457 } |
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2458 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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2459 progress = progress || success; |
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2460 } |
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2461 } |
4115 | 2462 } |
2463 | |
2464 //------------------------------expand_macro_nodes---------------------- | |
2465 // Returns true if a failure occurred. | |
2466 bool PhaseMacroExpand::expand_macro_nodes() { | |
2467 // Last attempt to eliminate macro nodes. | |
2468 eliminate_macro_nodes(); | |
2469 | |
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2470 // Make sure expansion will not cause node limit to be exceeded. |
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2471 // Worst case is a macro node gets expanded into about 50 nodes. |
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2472 // Allow 50% more for optimization. |
0 | 2473 if (C->check_node_count(C->macro_count() * 75, "out of nodes before macro expansion" ) ) |
2474 return true; | |
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2475 |
4115 | 2476 // Eliminate Opaque and LoopLimit nodes. Do it after all loop optimizations. |
2477 bool progress = true; | |
2478 while (progress) { | |
2479 progress = false; | |
2480 for (int i = C->macro_count(); i > 0; i--) { | |
2481 Node * n = C->macro_node(i-1); | |
2482 bool success = false; | |
2483 debug_only(int old_macro_count = C->macro_count();); | |
2484 if (n->Opcode() == Op_LoopLimit) { | |
2485 // Remove it from macro list and put on IGVN worklist to optimize. | |
2486 C->remove_macro_node(n); | |
2487 _igvn._worklist.push(n); | |
2488 success = true; | |
10278 | 2489 } else if (n->Opcode() == Op_CallStaticJava) { |
2490 // Remove it from macro list and put on IGVN worklist to optimize. | |
2491 C->remove_macro_node(n); | |
2492 _igvn._worklist.push(n); | |
2493 success = true; | |
4115 | 2494 } else if (n->Opcode() == Op_Opaque1 || n->Opcode() == Op_Opaque2) { |
2495 _igvn.replace_node(n, n->in(1)); | |
2496 success = true; | |
2497 } | |
2498 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); | |
2499 progress = progress || success; | |
2500 } | |
2501 } | |
2502 | |
0 | 2503 // expand "macro" nodes |
2504 // nodes are removed from the macro list as they are processed | |
2505 while (C->macro_count() > 0) { | |
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2506 int macro_count = C->macro_count(); |
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2507 Node * n = C->macro_node(macro_count-1); |
0 | 2508 assert(n->is_macro(), "only macro nodes expected here"); |
2509 if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) { | |
2510 // node is unreachable, so don't try to expand it | |
2511 C->remove_macro_node(n); | |
2512 continue; | |
2513 } | |
2514 switch (n->class_id()) { | |
2515 case Node::Class_Allocate: | |
2516 expand_allocate(n->as_Allocate()); | |
2517 break; | |
2518 case Node::Class_AllocateArray: | |
2519 expand_allocate_array(n->as_AllocateArray()); | |
2520 break; | |
2521 case Node::Class_Lock: | |
2522 expand_lock_node(n->as_Lock()); | |
2523 break; | |
2524 case Node::Class_Unlock: | |
2525 expand_unlock_node(n->as_Unlock()); | |
2526 break; | |
2527 default: | |
2528 assert(false, "unknown node type in macro list"); | |
2529 } | |
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2530 assert(C->macro_count() < macro_count, "must have deleted a node from macro list"); |
0 | 2531 if (C->failing()) return true; |
2532 } | |
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2533 |
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2534 _igvn.set_delay_transform(false); |
0 | 2535 _igvn.optimize(); |
4115 | 2536 if (C->failing()) return true; |
0 | 2537 return false; |
2538 } |