Mercurial > hg > graal-compiler
annotate src/share/vm/opto/macro.cpp @ 3345:bad7ecd0b6ed
5091921: Sign flip issues in loop optimizer
Summary: Fix integer overflow problem in the code generated by loop optimizer.
Reviewed-by: never
author | kvn |
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date | Wed, 04 May 2011 13:12:42 -0700 |
parents | 149bb459be66 |
children | 293f68bda347 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "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()) { |
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84 new_in->set_req(0, newcall->in(0)); // 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, 3) AndXNode(word, MakeConX(mask))); |
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107 cmp = transform_later(new (C, 3) 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, 2) BoolNode(cmp, BoolTest::ne)); |
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112 IfNode* iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN ); |
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113 transform_later(iff); |
0 | 114 |
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115 // Fast path taken. |
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116 Node *fast_taken = transform_later( new (C, 1) 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, 1) 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 int size = slow_call_type->domain()->cnt(); | |
145 CallNode *call = leaf_name | |
146 ? (CallNode*)new (C, size) CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM ) | |
147 : (CallNode*)new (C, size) CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), oldcall->jvms()->bci(), TypeRawPtr::BOTTOM ); | |
148 | |
149 // Slow path call has no side-effects, uses few values | |
150 copy_predefined_input_for_runtime_call(slow_path, oldcall, call ); | |
151 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0); | |
152 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1); | |
153 copy_call_debug_info(oldcall, call); | |
154 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
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155 _igvn.replace_node(oldcall, call); |
0 | 156 transform_later(call); |
157 | |
158 return call; | |
159 } | |
160 | |
161 void PhaseMacroExpand::extract_call_projections(CallNode *call) { | |
162 _fallthroughproj = NULL; | |
163 _fallthroughcatchproj = NULL; | |
164 _ioproj_fallthrough = NULL; | |
165 _ioproj_catchall = NULL; | |
166 _catchallcatchproj = NULL; | |
167 _memproj_fallthrough = NULL; | |
168 _memproj_catchall = NULL; | |
169 _resproj = NULL; | |
170 for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) { | |
171 ProjNode *pn = call->fast_out(i)->as_Proj(); | |
172 switch (pn->_con) { | |
173 case TypeFunc::Control: | |
174 { | |
175 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj | |
176 _fallthroughproj = pn; | |
177 DUIterator_Fast jmax, j = pn->fast_outs(jmax); | |
178 const Node *cn = pn->fast_out(j); | |
179 if (cn->is_Catch()) { | |
180 ProjNode *cpn = NULL; | |
181 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) { | |
182 cpn = cn->fast_out(k)->as_Proj(); | |
183 assert(cpn->is_CatchProj(), "must be a CatchProjNode"); | |
184 if (cpn->_con == CatchProjNode::fall_through_index) | |
185 _fallthroughcatchproj = cpn; | |
186 else { | |
187 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index."); | |
188 _catchallcatchproj = cpn; | |
189 } | |
190 } | |
191 } | |
192 break; | |
193 } | |
194 case TypeFunc::I_O: | |
195 if (pn->_is_io_use) | |
196 _ioproj_catchall = pn; | |
197 else | |
198 _ioproj_fallthrough = pn; | |
199 break; | |
200 case TypeFunc::Memory: | |
201 if (pn->_is_io_use) | |
202 _memproj_catchall = pn; | |
203 else | |
204 _memproj_fallthrough = pn; | |
205 break; | |
206 case TypeFunc::Parms: | |
207 _resproj = pn; | |
208 break; | |
209 default: | |
210 assert(false, "unexpected projection from allocation node."); | |
211 } | |
212 } | |
213 | |
214 } | |
215 | |
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216 // Eliminate a card mark sequence. p2x is a ConvP2XNode |
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217 void PhaseMacroExpand::eliminate_card_mark(Node* p2x) { |
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218 assert(p2x->Opcode() == Op_CastP2X, "ConvP2XNode required"); |
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219 if (!UseG1GC) { |
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220 // vanilla/CMS post barrier |
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221 Node *shift = p2x->unique_out(); |
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222 Node *addp = shift->unique_out(); |
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223 for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) { |
3282 | 224 Node *mem = addp->last_out(j); |
225 if (UseCondCardMark && mem->is_Load()) { | |
226 assert(mem->Opcode() == Op_LoadB, "unexpected code shape"); | |
227 // The load is checking if the card has been written so | |
228 // replace it with zero to fold the test. | |
229 _igvn.replace_node(mem, intcon(0)); | |
230 continue; | |
231 } | |
232 assert(mem->is_Store(), "store required"); | |
233 _igvn.replace_node(mem, mem->in(MemNode::Memory)); | |
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234 } |
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235 } else { |
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236 // G1 pre/post barriers |
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237 assert(p2x->outcnt() == 2, "expects 2 users: Xor and URShift nodes"); |
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238 // It could be only one user, URShift node, in Object.clone() instrinsic |
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239 // but the new allocation is passed to arraycopy stub and it could not |
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240 // be scalar replaced. So we don't check the case. |
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241 |
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242 // Remove G1 post barrier. |
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243 |
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244 // Search for CastP2X->Xor->URShift->Cmp path which |
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245 // checks if the store done to a different from the value's region. |
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246 // And replace Cmp with #0 (false) to collapse G1 post barrier. |
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247 Node* xorx = NULL; |
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248 for (DUIterator_Fast imax, i = p2x->fast_outs(imax); i < imax; i++) { |
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249 Node* u = p2x->fast_out(i); |
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250 if (u->Opcode() == Op_XorX) { |
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251 xorx = u; |
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252 break; |
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253 } |
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254 } |
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255 assert(xorx != NULL, "missing G1 post barrier"); |
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256 Node* shift = xorx->unique_out(); |
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257 Node* cmpx = shift->unique_out(); |
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258 assert(cmpx->is_Cmp() && cmpx->unique_out()->is_Bool() && |
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259 cmpx->unique_out()->as_Bool()->_test._test == BoolTest::ne, |
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260 "missing region check in G1 post barrier"); |
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261 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ)); |
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262 |
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263 // Remove G1 pre barrier. |
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264 |
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265 // Search "if (marking != 0)" check and set it to "false". |
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266 Node* this_region = p2x->in(0); |
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267 assert(this_region != NULL, ""); |
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268 // There is no G1 pre barrier if previous stored value is NULL |
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269 // (for example, after initialization). |
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270 if (this_region->is_Region() && this_region->req() == 3) { |
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271 int ind = 1; |
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272 if (!this_region->in(ind)->is_IfFalse()) { |
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273 ind = 2; |
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274 } |
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275 if (this_region->in(ind)->is_IfFalse()) { |
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276 Node* bol = this_region->in(ind)->in(0)->in(1); |
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277 assert(bol->is_Bool(), ""); |
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278 cmpx = bol->in(1); |
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279 if (bol->as_Bool()->_test._test == BoolTest::ne && |
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280 cmpx->is_Cmp() && cmpx->in(2) == intcon(0) && |
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281 cmpx->in(1)->is_Load()) { |
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282 Node* adr = cmpx->in(1)->as_Load()->in(MemNode::Address); |
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283 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + |
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284 PtrQueue::byte_offset_of_active()); |
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285 if (adr->is_AddP() && adr->in(AddPNode::Base) == top() && |
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286 adr->in(AddPNode::Address)->Opcode() == Op_ThreadLocal && |
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287 adr->in(AddPNode::Offset) == MakeConX(marking_offset)) { |
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288 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ)); |
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289 } |
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290 } |
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291 } |
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292 } |
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293 // Now CastP2X can be removed since it is used only on dead path |
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294 // which currently still alive until igvn optimize it. |
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295 assert(p2x->unique_out()->Opcode() == Op_URShiftX, ""); |
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296 _igvn.replace_node(p2x, top()); |
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297 } |
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298 } |
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299 |
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300 // Search for a memory operation for the specified memory slice. |
253
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301 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) { |
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302 Node *orig_mem = mem; |
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303 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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304 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr(); |
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305 while (true) { |
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306 if (mem == alloc_mem || mem == start_mem ) { |
605 | 307 return mem; // hit one of our sentinels |
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308 } else if (mem->is_MergeMem()) { |
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309 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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310 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) { |
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311 Node *in = mem->in(0); |
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312 // we can safely skip over safepoints, calls, locks and membars because we |
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313 // already know that the object is safe to eliminate. |
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314 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) { |
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315 return in; |
253
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316 } else if (in->is_Call()) { |
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317 CallNode *call = in->as_Call(); |
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318 if (!call->may_modify(tinst, phase)) { |
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319 mem = call->in(TypeFunc::Memory); |
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320 } |
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321 mem = in->in(TypeFunc::Memory); |
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322 } else if (in->is_MemBar()) { |
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323 mem = in->in(TypeFunc::Memory); |
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324 } else { |
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325 assert(false, "unexpected projection"); |
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326 } |
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327 } else if (mem->is_Store()) { |
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328 const TypePtr* atype = mem->as_Store()->adr_type(); |
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329 int adr_idx = Compile::current()->get_alias_index(atype); |
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330 if (adr_idx == alias_idx) { |
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331 assert(atype->isa_oopptr(), "address type must be oopptr"); |
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332 int adr_offset = atype->offset(); |
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333 uint adr_iid = atype->is_oopptr()->instance_id(); |
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334 // Array elements references have the same alias_idx |
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335 // but different offset and different instance_id. |
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336 if (adr_offset == offset && adr_iid == alloc->_idx) |
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337 return mem; |
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338 } else { |
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339 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw"); |
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340 } |
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341 mem = mem->in(MemNode::Memory); |
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342 } else if (mem->is_ClearArray()) { |
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343 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) { |
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344 // Can not bypass initialization of the instance |
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345 // we are looking. |
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346 debug_only(intptr_t offset;) |
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347 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity"); |
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348 InitializeNode* init = alloc->as_Allocate()->initialization(); |
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349 // We are looking for stored value, return Initialize node |
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350 // or memory edge from Allocate node. |
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351 if (init != NULL) |
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352 return init; |
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353 else |
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354 return alloc->in(TypeFunc::Memory); // It will produce zero value (see callers). |
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355 } |
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356 // Otherwise skip it (the call updated 'mem' value). |
584 | 357 } else if (mem->Opcode() == Op_SCMemProj) { |
358 assert(mem->in(0)->is_LoadStore(), "sanity"); | |
359 const TypePtr* atype = mem->in(0)->in(MemNode::Address)->bottom_type()->is_ptr(); | |
360 int adr_idx = Compile::current()->get_alias_index(atype); | |
361 if (adr_idx == alias_idx) { | |
362 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); | |
363 return NULL; | |
364 } | |
365 mem = mem->in(0)->in(MemNode::Memory); | |
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366 } else { |
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367 return mem; |
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368 } |
247 | 369 assert(mem != orig_mem, "dead memory loop"); |
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370 } |
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371 } |
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372 |
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373 // |
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374 // Given a Memory Phi, compute a value Phi containing the values from stores |
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375 // on the input paths. |
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376 // Note: this function is recursive, its depth is limied by the "level" argument |
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377 // Returns the computed Phi, or NULL if it cannot compute it. |
247 | 378 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) { |
379 assert(mem->is_Phi(), "sanity"); | |
380 int alias_idx = C->get_alias_index(adr_t); | |
381 int offset = adr_t->offset(); | |
382 int instance_id = adr_t->instance_id(); | |
383 | |
384 // Check if an appropriate value phi already exists. | |
385 Node* region = mem->in(0); | |
386 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) { | |
387 Node* phi = region->fast_out(k); | |
388 if (phi->is_Phi() && phi != mem && | |
389 phi->as_Phi()->is_same_inst_field(phi_type, instance_id, alias_idx, offset)) { | |
390 return phi; | |
391 } | |
392 } | |
393 // Check if an appropriate new value phi already exists. | |
394 Node* new_phi = NULL; | |
395 uint size = value_phis->size(); | |
396 for (uint i=0; i < size; i++) { | |
397 if ( mem->_idx == value_phis->index_at(i) ) { | |
398 return value_phis->node_at(i); | |
399 } | |
400 } | |
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401 |
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402 if (level <= 0) { |
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403 return NULL; // Give up: phi tree too deep |
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404 } |
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405 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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406 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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407 |
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408 uint length = mem->req(); |
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409 GrowableArray <Node *> values(length, length, NULL); |
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410 |
247 | 411 // create a new Phi for the value |
412 PhiNode *phi = new (C, length) PhiNode(mem->in(0), phi_type, NULL, instance_id, alias_idx, offset); | |
413 transform_later(phi); | |
414 value_phis->push(phi, mem->_idx); | |
415 | |
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416 for (uint j = 1; j < length; j++) { |
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417 Node *in = mem->in(j); |
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418 if (in == NULL || in->is_top()) { |
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419 values.at_put(j, in); |
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420 } else { |
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421 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn); |
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422 if (val == start_mem || val == alloc_mem) { |
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423 // hit a sentinel, return appropriate 0 value |
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424 values.at_put(j, _igvn.zerocon(ft)); |
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425 continue; |
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426 } |
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427 if (val->is_Initialize()) { |
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428 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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429 } |
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430 if (val == NULL) { |
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431 return NULL; // can't find a value on this path |
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432 } |
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433 if (val == mem) { |
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434 values.at_put(j, mem); |
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435 } else if (val->is_Store()) { |
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436 values.at_put(j, val->in(MemNode::ValueIn)); |
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437 } else if(val->is_Proj() && val->in(0) == alloc) { |
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438 values.at_put(j, _igvn.zerocon(ft)); |
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439 } else if (val->is_Phi()) { |
247 | 440 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1); |
441 if (val == NULL) { | |
442 return NULL; | |
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443 } |
247 | 444 values.at_put(j, val); |
584 | 445 } else if (val->Opcode() == Op_SCMemProj) { |
446 assert(val->in(0)->is_LoadStore(), "sanity"); | |
447 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); | |
448 return NULL; | |
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449 } else { |
584 | 450 #ifdef ASSERT |
451 val->dump(); | |
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452 assert(false, "unknown node on this path"); |
584 | 453 #endif |
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454 return NULL; // unknown node on this path |
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455 } |
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456 } |
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457 } |
247 | 458 // Set Phi's inputs |
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459 for (uint j = 1; j < length; j++) { |
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460 if (values.at(j) == mem) { |
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461 phi->init_req(j, phi); |
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462 } else { |
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463 phi->init_req(j, values.at(j)); |
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464 } |
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465 } |
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466 return phi; |
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467 } |
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468 |
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469 // Search the last value stored into the object's field. |
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470 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc) { |
223 | 471 assert(adr_t->is_known_instance_field(), "instance required"); |
472 int instance_id = adr_t->instance_id(); | |
473 assert((uint)instance_id == alloc->_idx, "wrong allocation"); | |
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474 |
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475 int alias_idx = C->get_alias_index(adr_t); |
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476 int offset = adr_t->offset(); |
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477 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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478 Node *alloc_ctrl = alloc->in(TypeFunc::Control); |
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479 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
247 | 480 Arena *a = Thread::current()->resource_area(); |
481 VectorSet visited(a); | |
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482 |
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483 |
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484 bool done = sfpt_mem == alloc_mem; |
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485 Node *mem = sfpt_mem; |
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486 while (!done) { |
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487 if (visited.test_set(mem->_idx)) { |
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488 return NULL; // found a loop, give up |
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489 } |
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490 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn); |
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491 if (mem == start_mem || mem == alloc_mem) { |
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492 done = true; // hit a sentinel, return appropriate 0 value |
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493 } else if (mem->is_Initialize()) { |
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494 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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495 if (mem == NULL) { |
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496 done = true; // Something go wrong. |
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497 } else if (mem->is_Store()) { |
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498 const TypePtr* atype = mem->as_Store()->adr_type(); |
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499 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice"); |
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500 done = true; |
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501 } |
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502 } else if (mem->is_Store()) { |
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503 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr(); |
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504 assert(atype != NULL, "address type must be oopptr"); |
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505 assert(C->get_alias_index(atype) == alias_idx && |
223 | 506 atype->is_known_instance_field() && atype->offset() == offset && |
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507 atype->instance_id() == instance_id, "store is correct memory slice"); |
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508 done = true; |
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509 } else if (mem->is_Phi()) { |
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510 // try to find a phi's unique input |
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511 Node *unique_input = NULL; |
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512 Node *top = C->top(); |
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513 for (uint i = 1; i < mem->req(); i++) { |
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514 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn); |
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515 if (n == NULL || n == top || n == mem) { |
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516 continue; |
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517 } else if (unique_input == NULL) { |
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518 unique_input = n; |
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519 } else if (unique_input != n) { |
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520 unique_input = top; |
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521 break; |
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522 } |
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523 } |
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524 if (unique_input != NULL && unique_input != top) { |
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525 mem = unique_input; |
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526 } else { |
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527 done = true; |
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528 } |
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529 } else { |
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530 assert(false, "unexpected node"); |
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531 } |
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532 } |
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533 if (mem != NULL) { |
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534 if (mem == start_mem || mem == alloc_mem) { |
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535 // hit a sentinel, return appropriate 0 value |
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536 return _igvn.zerocon(ft); |
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537 } else if (mem->is_Store()) { |
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538 return mem->in(MemNode::ValueIn); |
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539 } else if (mem->is_Phi()) { |
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540 // attempt to produce a Phi reflecting the values on the input paths of the Phi |
247 | 541 Node_Stack value_phis(a, 8); |
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542 Node * phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit); |
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543 if (phi != NULL) { |
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544 return phi; |
247 | 545 } else { |
546 // Kill all new Phis | |
547 while(value_phis.is_nonempty()) { | |
548 Node* n = value_phis.node(); | |
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549 _igvn.replace_node(n, C->top()); |
247 | 550 value_phis.pop(); |
551 } | |
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552 } |
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553 } |
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554 } |
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555 // Something go wrong. |
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556 return NULL; |
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557 } |
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558 |
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559 // Check the possibility of scalar replacement. |
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560 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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561 // Scan the uses of the allocation to check for anything that would |
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562 // prevent us from eliminating it. |
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563 NOT_PRODUCT( const char* fail_eliminate = NULL; ) |
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564 DEBUG_ONLY( Node* disq_node = NULL; ) |
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565 bool can_eliminate = true; |
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566 |
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567 Node* res = alloc->result_cast(); |
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568 const TypeOopPtr* res_type = NULL; |
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569 if (res == NULL) { |
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570 // All users were eliminated. |
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571 } else if (!res->is_CheckCastPP()) { |
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572 alloc->_is_scalar_replaceable = false; // don't try again |
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573 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";) |
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574 can_eliminate = false; |
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575 } else { |
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576 res_type = _igvn.type(res)->isa_oopptr(); |
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577 if (res_type == NULL) { |
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578 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";) |
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579 can_eliminate = false; |
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580 } else if (res_type->isa_aryptr()) { |
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581 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
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582 if (length < 0) { |
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583 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";) |
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584 can_eliminate = false; |
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585 } |
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586 } |
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587 } |
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588 |
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589 if (can_eliminate && res != NULL) { |
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590 for (DUIterator_Fast jmax, j = res->fast_outs(jmax); |
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591 j < jmax && can_eliminate; j++) { |
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592 Node* use = res->fast_out(j); |
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593 |
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594 if (use->is_AddP()) { |
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595 const TypePtr* addp_type = _igvn.type(use)->is_ptr(); |
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596 int offset = addp_type->offset(); |
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597 |
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598 if (offset == Type::OffsetTop || offset == Type::OffsetBot) { |
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599 NOT_PRODUCT(fail_eliminate = "Undefined field referrence";) |
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600 can_eliminate = false; |
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601 break; |
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602 } |
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603 for (DUIterator_Fast kmax, k = use->fast_outs(kmax); |
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604 k < kmax && can_eliminate; k++) { |
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605 Node* n = use->fast_out(k); |
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606 if (!n->is_Store() && n->Opcode() != Op_CastP2X) { |
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607 DEBUG_ONLY(disq_node = n;) |
253
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608 if (n->is_Load() || n->is_LoadStore()) { |
73
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609 NOT_PRODUCT(fail_eliminate = "Field load";) |
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610 } else { |
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611 NOT_PRODUCT(fail_eliminate = "Not store field referrence";) |
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612 } |
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613 can_eliminate = false; |
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614 } |
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615 } |
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616 } else if (use->is_SafePoint()) { |
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617 SafePointNode* sfpt = use->as_SafePoint(); |
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618 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) { |
73
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619 // Object is passed as argument. |
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620 DEBUG_ONLY(disq_node = use;) |
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621 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";) |
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622 can_eliminate = false; |
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623 } |
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624 Node* sfptMem = sfpt->memory(); |
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625 if (sfptMem == NULL || sfptMem->is_top()) { |
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626 DEBUG_ONLY(disq_node = use;) |
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627 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";) |
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628 can_eliminate = false; |
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629 } else { |
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630 safepoints.append_if_missing(sfpt); |
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631 } |
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632 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark |
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633 if (use->is_Phi()) { |
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634 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) { |
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635 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
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636 } else { |
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637 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";) |
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638 } |
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639 DEBUG_ONLY(disq_node = use;) |
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640 } else { |
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641 if (use->Opcode() == Op_Return) { |
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642 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
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643 }else { |
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644 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";) |
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645 } |
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646 DEBUG_ONLY(disq_node = use;) |
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647 } |
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648 can_eliminate = false; |
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|
649 } |
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650 } |
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651 } |
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652 |
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653 #ifndef PRODUCT |
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654 if (PrintEliminateAllocations) { |
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655 if (can_eliminate) { |
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656 tty->print("Scalar "); |
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657 if (res == NULL) |
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658 alloc->dump(); |
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659 else |
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660 res->dump(); |
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661 } else { |
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662 tty->print("NotScalar (%s)", fail_eliminate); |
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663 if (res == NULL) |
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664 alloc->dump(); |
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665 else |
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666 res->dump(); |
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667 #ifdef ASSERT |
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668 if (disq_node != NULL) { |
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669 tty->print(" >>>> "); |
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670 disq_node->dump(); |
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671 } |
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672 #endif /*ASSERT*/ |
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673 } |
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674 } |
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675 #endif |
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676 return can_eliminate; |
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677 } |
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678 |
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679 // Do scalar replacement. |
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680 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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681 GrowableArray <SafePointNode *> safepoints_done; |
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682 |
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683 ciKlass* klass = NULL; |
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684 ciInstanceKlass* iklass = NULL; |
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685 int nfields = 0; |
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686 int array_base; |
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687 int element_size; |
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688 BasicType basic_elem_type; |
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689 ciType* elem_type; |
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690 |
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691 Node* res = alloc->result_cast(); |
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692 const TypeOopPtr* res_type = NULL; |
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693 if (res != NULL) { // Could be NULL when there are no users |
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694 res_type = _igvn.type(res)->isa_oopptr(); |
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695 } |
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|
696 |
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|
697 if (res != NULL) { |
a8880a78d355
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|
698 klass = res_type->klass(); |
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699 if (res_type->isa_instptr()) { |
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700 // find the fields of the class which will be needed for safepoint debug information |
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701 assert(klass->is_instance_klass(), "must be an instance klass."); |
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702 iklass = klass->as_instance_klass(); |
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703 nfields = iklass->nof_nonstatic_fields(); |
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704 } else { |
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|
705 // find the array's elements which will be needed for safepoint debug information |
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706 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
a8880a78d355
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707 assert(klass->is_array_klass() && nfields >= 0, "must be an array klass."); |
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708 elem_type = klass->as_array_klass()->element_type(); |
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709 basic_elem_type = elem_type->basic_type(); |
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710 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type); |
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711 element_size = type2aelembytes(basic_elem_type); |
a8880a78d355
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712 } |
a8880a78d355
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713 } |
a8880a78d355
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714 // |
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715 // Process the safepoint uses |
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716 // |
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717 while (safepoints.length() > 0) { |
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718 SafePointNode* sfpt = safepoints.pop(); |
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719 Node* mem = sfpt->memory(); |
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720 uint first_ind = sfpt->req(); |
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721 SafePointScalarObjectNode* sobj = new (C, 1) SafePointScalarObjectNode(res_type, |
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722 #ifdef ASSERT |
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723 alloc, |
a8880a78d355
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724 #endif |
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725 first_ind, nfields); |
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726 sobj->init_req(0, sfpt->in(TypeFunc::Control)); |
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727 transform_later(sobj); |
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|
728 |
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|
729 // Scan object's fields adding an input to the safepoint for each field. |
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730 for (int j = 0; j < nfields; j++) { |
306
af945ba2e739
6741738: TypePtr::add_offset() set incorrect offset when the add overflows
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|
731 intptr_t offset; |
73
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|
732 ciField* field = NULL; |
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|
733 if (iklass != NULL) { |
a8880a78d355
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|
734 field = iklass->nonstatic_field_at(j); |
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735 offset = field->offset(); |
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|
736 elem_type = field->type(); |
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|
737 basic_elem_type = field->layout_type(); |
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|
738 } else { |
306
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739 offset = array_base + j * (intptr_t)element_size; |
73
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|
740 } |
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|
741 |
a8880a78d355
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|
742 const Type *field_type; |
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|
743 // The next code is taken from Parse::do_get_xxx(). |
124
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744 if (basic_elem_type == T_OBJECT || basic_elem_type == T_ARRAY) { |
73
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745 if (!elem_type->is_loaded()) { |
a8880a78d355
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746 field_type = TypeInstPtr::BOTTOM; |
1682
e5dfb3ccb88b
6969569: assert(is_static() && is_constant()) failed: illegal call to constant_value()
kvn
parents:
1621
diff
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|
747 } else if (field != NULL && field->is_constant() && field->is_static()) { |
73
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748 // This can happen if the constant oop is non-perm. |
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749 ciObject* con = field->constant_value().as_object(); |
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750 // Do not "join" in the previous type; it doesn't add value, |
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751 // and may yield a vacuous result if the field is of interface type. |
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752 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); |
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753 assert(field_type != NULL, "field singleton type must be consistent"); |
a8880a78d355
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|
754 } else { |
a8880a78d355
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|
755 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass()); |
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756 } |
124
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757 if (UseCompressedOops) { |
221
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
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diff
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|
758 field_type = field_type->make_narrowoop(); |
124
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759 basic_elem_type = T_NARROWOOP; |
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|
760 } |
73
a8880a78d355
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|
761 } else { |
a8880a78d355
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|
762 field_type = Type::get_const_basic_type(basic_elem_type); |
a8880a78d355
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|
763 } |
a8880a78d355
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diff
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|
764 |
a8880a78d355
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|
765 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr(); |
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|
766 |
a8880a78d355
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|
767 Node *field_val = value_from_mem(mem, basic_elem_type, field_type, field_addr_type, alloc); |
a8880a78d355
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|
768 if (field_val == NULL) { |
a8880a78d355
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diff
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|
769 // we weren't able to find a value for this field, |
a8880a78d355
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diff
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|
770 // give up on eliminating this allocation |
a8880a78d355
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diff
changeset
|
771 alloc->_is_scalar_replaceable = false; // don't try again |
a8880a78d355
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kvn
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diff
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|
772 // remove any extra entries we added to the safepoint |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
773 uint last = sfpt->req() - 1; |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
774 for (int k = 0; k < j; k++) { |
a8880a78d355
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kvn
parents:
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diff
changeset
|
775 sfpt->del_req(last--); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
776 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
777 // rollback processed safepoints |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
778 while (safepoints_done.length() > 0) { |
a8880a78d355
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kvn
parents:
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diff
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|
779 SafePointNode* sfpt_done = safepoints_done.pop(); |
a8880a78d355
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diff
changeset
|
780 // remove any extra entries we added to the safepoint |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
781 last = sfpt_done->req() - 1; |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
782 for (int k = 0; k < nfields; k++) { |
a8880a78d355
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kvn
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diff
changeset
|
783 sfpt_done->del_req(last--); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
784 } |
a8880a78d355
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kvn
parents:
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diff
changeset
|
785 JVMState *jvms = sfpt_done->jvms(); |
a8880a78d355
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|
786 jvms->set_endoff(sfpt_done->req()); |
a8880a78d355
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kvn
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diff
changeset
|
787 // Now make a pass over the debug information replacing any references |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
788 // to SafePointScalarObjectNode with the allocated object. |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
789 int start = jvms->debug_start(); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
790 int end = jvms->debug_end(); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
791 for (int i = start; i < end; i++) { |
a8880a78d355
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kvn
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diff
changeset
|
792 if (sfpt_done->in(i)->is_SafePointScalarObject()) { |
a8880a78d355
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diff
changeset
|
793 SafePointScalarObjectNode* scobj = sfpt_done->in(i)->as_SafePointScalarObject(); |
a8880a78d355
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diff
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|
794 if (scobj->first_index() == sfpt_done->req() && |
a8880a78d355
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diff
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|
795 scobj->n_fields() == (uint)nfields) { |
a8880a78d355
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kvn
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diff
changeset
|
796 assert(scobj->alloc() == alloc, "sanity"); |
a8880a78d355
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kvn
parents:
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diff
changeset
|
797 sfpt_done->set_req(i, res); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
798 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
799 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
800 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
801 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
802 #ifndef PRODUCT |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
803 if (PrintEliminateAllocations) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
804 if (field != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
805 tty->print("=== At SafePoint node %d can't find value of Field: ", |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
806 sfpt->_idx); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
807 field->print(); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
808 int field_idx = C->get_alias_index(field_addr_type); |
a8880a78d355
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diff
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|
809 tty->print(" (alias_idx=%d)", field_idx); |
a8880a78d355
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kvn
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66
diff
changeset
|
810 } else { // Array's element |
a8880a78d355
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kvn
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66
diff
changeset
|
811 tty->print("=== At SafePoint node %d can't find value of array element [%d]", |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
812 sfpt->_idx, j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
813 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
814 tty->print(", which prevents elimination of: "); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
815 if (res == NULL) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
816 alloc->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
817 else |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
818 res->dump(); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
819 } |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
820 #endif |
a8880a78d355
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kvn
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66
diff
changeset
|
821 return false; |
a8880a78d355
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66
diff
changeset
|
822 } |
124
b130b98db9cf
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|
823 if (UseCompressedOops && field_type->isa_narrowoop()) { |
b130b98db9cf
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|
824 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation |
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113
diff
changeset
|
825 // to be able scalar replace the allocation. |
221
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
kvn
parents:
216
diff
changeset
|
826 if (field_val->is_EncodeP()) { |
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
kvn
parents:
216
diff
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|
827 field_val = field_val->in(1); |
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
kvn
parents:
216
diff
changeset
|
828 } else { |
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
kvn
parents:
216
diff
changeset
|
829 field_val = transform_later(new (C, 2) DecodeNNode(field_val, field_val->bottom_type()->make_ptr())); |
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
kvn
parents:
216
diff
changeset
|
830 } |
124
b130b98db9cf
6689060: Escape Analysis does not work with Compressed Oops
kvn
parents:
113
diff
changeset
|
831 } |
73
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
832 sfpt->add_req(field_val); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
833 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
834 JVMState *jvms = sfpt->jvms(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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diff
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|
835 jvms->set_endoff(sfpt->req()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
836 // 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
|
837 // to the allocated object with "sobj" |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
838 int start = jvms->debug_start(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
839 int end = jvms->debug_end(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
840 for (int i = start; i < end; i++) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
841 if (sfpt->in(i) == res) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
842 sfpt->set_req(i, sobj); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
843 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
844 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
845 safepoints_done.append_if_missing(sfpt); // keep it for rollback |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
846 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
847 return true; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
848 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
849 |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
850 // Process users of eliminated allocation. |
a8880a78d355
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diff
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|
851 void PhaseMacroExpand::process_users_of_allocation(AllocateNode *alloc) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
852 Node* res = alloc->result_cast(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
853 if (res != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
854 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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|
855 Node *use = res->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
856 uint oc1 = res->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
857 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
858 if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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|
859 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) { |
a8880a78d355
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kvn
parents:
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diff
changeset
|
860 Node *n = use->last_out(k); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
861 uint oc2 = use->outcnt(); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
862 if (n->is_Store()) { |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
863 #ifdef ASSERT |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
864 // Verify that there is no dependent MemBarVolatile nodes, |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
865 // they should be removed during IGVN, see MemBarNode::Ideal(). |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
866 for (DUIterator_Fast pmax, p = n->fast_outs(pmax); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
867 p < pmax; p++) { |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
868 Node* mb = n->fast_out(p); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
869 assert(mb->is_Initialize() || !mb->is_MemBar() || |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
870 mb->req() <= MemBarNode::Precedent || |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
871 mb->in(MemBarNode::Precedent) != n, |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
872 "MemBarVolatile should be eliminated for non-escaping object"); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
873 } |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
874 #endif |
73
a8880a78d355
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kvn
parents:
66
diff
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|
875 _igvn.replace_node(n, n->in(MemNode::Memory)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
876 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
877 eliminate_card_mark(n); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
878 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
879 k -= (oc2 - use->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
880 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
881 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
882 eliminate_card_mark(use); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
883 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
884 j -= (oc1 - res->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
885 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
886 assert(res->outcnt() == 0, "all uses of allocated objects must be deleted"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
887 _igvn.remove_dead_node(res); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
888 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
889 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
890 // |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
891 // Process other users of allocation's projections |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
892 // |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
893 if (_resproj != NULL && _resproj->outcnt() != 0) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
894 for (DUIterator_Last jmin, j = _resproj->last_outs(jmin); j >= jmin; ) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
895 Node *use = _resproj->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
896 uint oc1 = _resproj->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
897 if (use->is_Initialize()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
898 // Eliminate Initialize node. |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
899 InitializeNode *init = use->as_Initialize(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
900 assert(init->outcnt() <= 2, "only a control and memory projection expected"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
901 Node *ctrl_proj = init->proj_out(TypeFunc::Control); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
902 if (ctrl_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
903 assert(init->in(TypeFunc::Control) == _fallthroughcatchproj, "allocation control projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
904 _igvn.replace_node(ctrl_proj, _fallthroughcatchproj); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
905 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
906 Node *mem_proj = init->proj_out(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
907 if (mem_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
908 Node *mem = init->in(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
909 #ifdef ASSERT |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
910 if (mem->is_MergeMem()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
911 assert(mem->in(TypeFunc::Memory) == _memproj_fallthrough, "allocation memory projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
912 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
913 assert(mem == _memproj_fallthrough, "allocation memory projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
914 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
915 #endif |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
916 _igvn.replace_node(mem_proj, mem); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
917 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
918 } else if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
919 // raw memory addresses used only by the initialization |
708
f2049ae95c3d
6711117: Assertion in 64bit server vm (flat != TypePtr::BOTTOM,"cannot alias-analyze an untyped ptr")
kvn
parents:
628
diff
changeset
|
920 _igvn.replace_node(use, C->top()); |
73
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
921 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
922 assert(false, "only Initialize or AddP expected"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
923 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
924 j -= (oc1 - _resproj->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
925 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
926 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
927 if (_fallthroughcatchproj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
928 _igvn.replace_node(_fallthroughcatchproj, alloc->in(TypeFunc::Control)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
929 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
930 if (_memproj_fallthrough != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
931 _igvn.replace_node(_memproj_fallthrough, alloc->in(TypeFunc::Memory)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
932 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
933 if (_memproj_catchall != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
934 _igvn.replace_node(_memproj_catchall, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
935 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
936 if (_ioproj_fallthrough != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
937 _igvn.replace_node(_ioproj_fallthrough, alloc->in(TypeFunc::I_O)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
938 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
939 if (_ioproj_catchall != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
940 _igvn.replace_node(_ioproj_catchall, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
941 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
942 if (_catchallcatchproj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
943 _igvn.replace_node(_catchallcatchproj, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
944 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
945 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
946 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
947 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
948 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
949 if (!EliminateAllocations || !alloc->_is_scalar_replaceable) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
950 return false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
951 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
952 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
953 extract_call_projections(alloc); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
954 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
955 GrowableArray <SafePointNode *> safepoints; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
956 if (!can_eliminate_allocation(alloc, safepoints)) { |
a8880a78d355
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957 return false; |
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958 } |
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959 |
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960 if (!scalar_replacement(alloc, safepoints)) { |
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961 return false; |
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962 } |
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963 |
1080
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964 CompileLog* log = C->log(); |
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965 if (log != NULL) { |
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966 Node* klass = alloc->in(AllocateNode::KlassNode); |
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967 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr(); |
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968 log->head("eliminate_allocation type='%d'", |
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969 log->identify(tklass->klass())); |
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970 JVMState* p = alloc->jvms(); |
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971 while (p != NULL) { |
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972 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); |
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973 p = p->caller(); |
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974 } |
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975 log->tail("eliminate_allocation"); |
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976 } |
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977 |
73
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978 process_users_of_allocation(alloc); |
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979 |
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980 #ifndef PRODUCT |
1080
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981 if (PrintEliminateAllocations) { |
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982 if (alloc->is_AllocateArray()) |
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983 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx); |
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984 else |
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985 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx); |
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986 } |
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987 #endif |
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988 |
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989 return true; |
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990 } |
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991 |
0 | 992 |
993 //---------------------------set_eden_pointers------------------------- | |
994 void PhaseMacroExpand::set_eden_pointers(Node* &eden_top_adr, Node* &eden_end_adr) { | |
995 if (UseTLAB) { // Private allocation: load from TLS | |
996 Node* thread = transform_later(new (C, 1) ThreadLocalNode()); | |
997 int tlab_top_offset = in_bytes(JavaThread::tlab_top_offset()); | |
998 int tlab_end_offset = in_bytes(JavaThread::tlab_end_offset()); | |
999 eden_top_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_top_offset); | |
1000 eden_end_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_end_offset); | |
1001 } else { // Shared allocation: load from globals | |
1002 CollectedHeap* ch = Universe::heap(); | |
1003 address top_adr = (address)ch->top_addr(); | |
1004 address end_adr = (address)ch->end_addr(); | |
1005 eden_top_adr = makecon(TypeRawPtr::make(top_adr)); | |
1006 eden_end_adr = basic_plus_adr(eden_top_adr, end_adr - top_adr); | |
1007 } | |
1008 } | |
1009 | |
1010 | |
1011 Node* PhaseMacroExpand::make_load(Node* ctl, Node* mem, Node* base, int offset, const Type* value_type, BasicType bt) { | |
1012 Node* adr = basic_plus_adr(base, offset); | |
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1013 const TypePtr* adr_type = adr->bottom_type()->is_ptr(); |
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1014 Node* value = LoadNode::make(_igvn, ctl, mem, adr, adr_type, value_type, bt); |
0 | 1015 transform_later(value); |
1016 return value; | |
1017 } | |
1018 | |
1019 | |
1020 Node* PhaseMacroExpand::make_store(Node* ctl, Node* mem, Node* base, int offset, Node* value, BasicType bt) { | |
1021 Node* adr = basic_plus_adr(base, offset); | |
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1022 mem = StoreNode::make(_igvn, ctl, mem, adr, NULL, value, bt); |
0 | 1023 transform_later(mem); |
1024 return mem; | |
1025 } | |
1026 | |
1027 //============================================================================= | |
1028 // | |
1029 // A L L O C A T I O N | |
1030 // | |
1031 // Allocation attempts to be fast in the case of frequent small objects. | |
1032 // It breaks down like this: | |
1033 // | |
1034 // 1) Size in doublewords is computed. This is a constant for objects and | |
1035 // variable for most arrays. Doubleword units are used to avoid size | |
1036 // overflow of huge doubleword arrays. We need doublewords in the end for | |
1037 // rounding. | |
1038 // | |
1039 // 2) Size is checked for being 'too large'. Too-large allocations will go | |
1040 // the slow path into the VM. The slow path can throw any required | |
1041 // exceptions, and does all the special checks for very large arrays. The | |
1042 // size test can constant-fold away for objects. For objects with | |
1043 // finalizers it constant-folds the otherway: you always go slow with | |
1044 // finalizers. | |
1045 // | |
1046 // 3) If NOT using TLABs, this is the contended loop-back point. | |
1047 // Load-Locked the heap top. If using TLABs normal-load the heap top. | |
1048 // | |
1049 // 4) Check that heap top + size*8 < max. If we fail go the slow ` route. | |
1050 // NOTE: "top+size*8" cannot wrap the 4Gig line! Here's why: for largish | |
1051 // "size*8" we always enter the VM, where "largish" is a constant picked small | |
1052 // enough that there's always space between the eden max and 4Gig (old space is | |
1053 // there so it's quite large) and large enough that the cost of entering the VM | |
1054 // is dwarfed by the cost to initialize the space. | |
1055 // | |
1056 // 5) If NOT using TLABs, Store-Conditional the adjusted heap top back | |
1057 // down. If contended, repeat at step 3. If using TLABs normal-store | |
1058 // adjusted heap top back down; there is no contention. | |
1059 // | |
1060 // 6) If !ZeroTLAB then Bulk-clear the object/array. Fill in klass & mark | |
1061 // fields. | |
1062 // | |
1063 // 7) Merge with the slow-path; cast the raw memory pointer to the correct | |
1064 // oop flavor. | |
1065 // | |
1066 //============================================================================= | |
1067 // FastAllocateSizeLimit value is in DOUBLEWORDS. | |
1068 // Allocations bigger than this always go the slow route. | |
1069 // This value must be small enough that allocation attempts that need to | |
1070 // trigger exceptions go the slow route. Also, it must be small enough so | |
1071 // that heap_top + size_in_bytes does not wrap around the 4Gig limit. | |
1072 //=============================================================================j// | |
1073 // %%% Here is an old comment from parseHelper.cpp; is it outdated? | |
1074 // The allocator will coalesce int->oop copies away. See comment in | |
1075 // coalesce.cpp about how this works. It depends critically on the exact | |
1076 // code shape produced here, so if you are changing this code shape | |
1077 // make sure the GC info for the heap-top is correct in and around the | |
1078 // slow-path call. | |
1079 // | |
1080 | |
1081 void PhaseMacroExpand::expand_allocate_common( | |
1082 AllocateNode* alloc, // allocation node to be expanded | |
1083 Node* length, // array length for an array allocation | |
1084 const TypeFunc* slow_call_type, // Type of slow call | |
1085 address slow_call_address // Address of slow call | |
1086 ) | |
1087 { | |
1088 | |
1089 Node* ctrl = alloc->in(TypeFunc::Control); | |
1090 Node* mem = alloc->in(TypeFunc::Memory); | |
1091 Node* i_o = alloc->in(TypeFunc::I_O); | |
1092 Node* size_in_bytes = alloc->in(AllocateNode::AllocSize); | |
1093 Node* klass_node = alloc->in(AllocateNode::KlassNode); | |
1094 Node* initial_slow_test = alloc->in(AllocateNode::InitialTest); | |
1095 | |
1096 assert(ctrl != NULL, "must have control"); | |
1097 // We need a Region and corresponding Phi's to merge the slow-path and fast-path results. | |
1098 // they will not be used if "always_slow" is set | |
1099 enum { slow_result_path = 1, fast_result_path = 2 }; | |
1100 Node *result_region; | |
1101 Node *result_phi_rawmem; | |
1102 Node *result_phi_rawoop; | |
1103 Node *result_phi_i_o; | |
1104 | |
1105 // The initial slow comparison is a size check, the comparison | |
1106 // we want to do is a BoolTest::gt | |
1107 bool always_slow = false; | |
1108 int tv = _igvn.find_int_con(initial_slow_test, -1); | |
1109 if (tv >= 0) { | |
1110 always_slow = (tv == 1); | |
1111 initial_slow_test = NULL; | |
1112 } else { | |
1113 initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn); | |
1114 } | |
1115 | |
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1116 if (C->env()->dtrace_alloc_probes() || |
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1117 !UseTLAB && (!Universe::heap()->supports_inline_contig_alloc() || |
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1118 (UseConcMarkSweepGC && CMSIncrementalMode))) { |
0 | 1119 // Force slow-path allocation |
1120 always_slow = true; | |
1121 initial_slow_test = NULL; | |
1122 } | |
1123 | |
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1124 |
0 | 1125 enum { too_big_or_final_path = 1, need_gc_path = 2 }; |
1126 Node *slow_region = NULL; | |
1127 Node *toobig_false = ctrl; | |
1128 | |
1129 assert (initial_slow_test == NULL || !always_slow, "arguments must be consistent"); | |
1130 // generate the initial test if necessary | |
1131 if (initial_slow_test != NULL ) { | |
1132 slow_region = new (C, 3) RegionNode(3); | |
1133 | |
1134 // Now make the initial failure test. Usually a too-big test but | |
1135 // might be a TRUE for finalizers or a fancy class check for | |
1136 // newInstance0. | |
1137 IfNode *toobig_iff = new (C, 2) IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN); | |
1138 transform_later(toobig_iff); | |
1139 // Plug the failing-too-big test into the slow-path region | |
1140 Node *toobig_true = new (C, 1) IfTrueNode( toobig_iff ); | |
1141 transform_later(toobig_true); | |
1142 slow_region ->init_req( too_big_or_final_path, toobig_true ); | |
1143 toobig_false = new (C, 1) IfFalseNode( toobig_iff ); | |
1144 transform_later(toobig_false); | |
1145 } else { // No initial test, just fall into next case | |
1146 toobig_false = ctrl; | |
1147 debug_only(slow_region = NodeSentinel); | |
1148 } | |
1149 | |
1150 Node *slow_mem = mem; // save the current memory state for slow path | |
1151 // generate the fast allocation code unless we know that the initial test will always go slow | |
1152 if (!always_slow) { | |
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1153 // Fast path modifies only raw memory. |
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1154 if (mem->is_MergeMem()) { |
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1155 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw); |
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1156 } |
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1157 |
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1158 Node* eden_top_adr; |
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1159 Node* eden_end_adr; |
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1160 |
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1161 set_eden_pointers(eden_top_adr, eden_end_adr); |
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1162 |
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1163 // Load Eden::end. Loop invariant and hoisted. |
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1164 // |
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1165 // Note: We set the control input on "eden_end" and "old_eden_top" when using |
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1166 // a TLAB to work around a bug where these values were being moved across |
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1167 // a safepoint. These are not oops, so they cannot be include in the oop |
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1168 // map, but they can be changed by a GC. The proper way to fix this would |
342
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1169 // be to set the raw memory state when generating a SafepointNode. However |
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1170 // this will require extensive changes to the loop optimization in order to |
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1171 // prevent a degradation of the optimization. |
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1172 // See comment in memnode.hpp, around line 227 in class LoadPNode. |
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1173 Node *eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS); |
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1174 |
0 | 1175 // allocate the Region and Phi nodes for the result |
1176 result_region = new (C, 3) RegionNode(3); | |
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1177 result_phi_rawmem = new (C, 3) PhiNode(result_region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1178 result_phi_rawoop = new (C, 3) PhiNode(result_region, TypeRawPtr::BOTTOM); |
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1179 result_phi_i_o = new (C, 3) PhiNode(result_region, Type::ABIO); // I/O is used for Prefetch |
0 | 1180 |
1181 // We need a Region for the loop-back contended case. | |
1182 enum { fall_in_path = 1, contended_loopback_path = 2 }; | |
1183 Node *contended_region; | |
1184 Node *contended_phi_rawmem; | |
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1185 if (UseTLAB) { |
0 | 1186 contended_region = toobig_false; |
1187 contended_phi_rawmem = mem; | |
1188 } else { | |
1189 contended_region = new (C, 3) RegionNode(3); | |
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1190 contended_phi_rawmem = new (C, 3) PhiNode(contended_region, Type::MEMORY, TypeRawPtr::BOTTOM); |
0 | 1191 // Now handle the passing-too-big test. We fall into the contended |
1192 // loop-back merge point. | |
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1193 contended_region ->init_req(fall_in_path, toobig_false); |
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1194 contended_phi_rawmem->init_req(fall_in_path, mem); |
0 | 1195 transform_later(contended_region); |
1196 transform_later(contended_phi_rawmem); | |
1197 } | |
1198 | |
1199 // Load(-locked) the heap top. | |
1200 // See note above concerning the control input when using a TLAB | |
1201 Node *old_eden_top = UseTLAB | |
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1202 ? new (C, 3) LoadPNode (ctrl, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM) |
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1203 : new (C, 3) LoadPLockedNode(contended_region, contended_phi_rawmem, eden_top_adr); |
0 | 1204 |
1205 transform_later(old_eden_top); | |
1206 // Add to heap top to get a new heap top | |
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1207 Node *new_eden_top = new (C, 4) AddPNode(top(), old_eden_top, size_in_bytes); |
0 | 1208 transform_later(new_eden_top); |
1209 // Check for needing a GC; compare against heap end | |
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1210 Node *needgc_cmp = new (C, 3) CmpPNode(new_eden_top, eden_end); |
0 | 1211 transform_later(needgc_cmp); |
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1212 Node *needgc_bol = new (C, 2) BoolNode(needgc_cmp, BoolTest::ge); |
0 | 1213 transform_later(needgc_bol); |
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1214 IfNode *needgc_iff = new (C, 2) IfNode(contended_region, needgc_bol, PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN); |
0 | 1215 transform_later(needgc_iff); |
1216 | |
1217 // Plug the failing-heap-space-need-gc test into the slow-path region | |
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1218 Node *needgc_true = new (C, 1) IfTrueNode(needgc_iff); |
0 | 1219 transform_later(needgc_true); |
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1220 if (initial_slow_test) { |
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1221 slow_region->init_req(need_gc_path, needgc_true); |
0 | 1222 // This completes all paths into the slow merge point |
1223 transform_later(slow_region); | |
1224 } else { // No initial slow path needed! | |
1225 // Just fall from the need-GC path straight into the VM call. | |
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1226 slow_region = needgc_true; |
0 | 1227 } |
1228 // No need for a GC. Setup for the Store-Conditional | |
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1229 Node *needgc_false = new (C, 1) IfFalseNode(needgc_iff); |
0 | 1230 transform_later(needgc_false); |
1231 | |
1232 // Grab regular I/O before optional prefetch may change it. | |
1233 // Slow-path does no I/O so just set it to the original I/O. | |
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1234 result_phi_i_o->init_req(slow_result_path, i_o); |
0 | 1235 |
1236 i_o = prefetch_allocation(i_o, needgc_false, contended_phi_rawmem, | |
1237 old_eden_top, new_eden_top, length); | |
1238 | |
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1239 // Name successful fast-path variables |
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1240 Node* fast_oop = old_eden_top; |
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1241 Node* fast_oop_ctrl; |
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1242 Node* fast_oop_rawmem; |
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1243 |
0 | 1244 // Store (-conditional) the modified eden top back down. |
1245 // StorePConditional produces flags for a test PLUS a modified raw | |
1246 // memory state. | |
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1247 if (UseTLAB) { |
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1248 Node* store_eden_top = |
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1249 new (C, 4) StorePNode(needgc_false, contended_phi_rawmem, eden_top_adr, |
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1250 TypeRawPtr::BOTTOM, new_eden_top); |
0 | 1251 transform_later(store_eden_top); |
1252 fast_oop_ctrl = needgc_false; // No contention, so this is the fast path | |
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1253 fast_oop_rawmem = store_eden_top; |
0 | 1254 } else { |
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1255 Node* store_eden_top = |
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1256 new (C, 5) StorePConditionalNode(needgc_false, contended_phi_rawmem, eden_top_adr, |
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1257 new_eden_top, fast_oop/*old_eden_top*/); |
0 | 1258 transform_later(store_eden_top); |
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1259 Node *contention_check = new (C, 2) BoolNode(store_eden_top, BoolTest::ne); |
0 | 1260 transform_later(contention_check); |
1261 store_eden_top = new (C, 1) SCMemProjNode(store_eden_top); | |
1262 transform_later(store_eden_top); | |
1263 | |
1264 // If not using TLABs, check to see if there was contention. | |
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1265 IfNode *contention_iff = new (C, 2) IfNode (needgc_false, contention_check, PROB_MIN, COUNT_UNKNOWN); |
0 | 1266 transform_later(contention_iff); |
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1267 Node *contention_true = new (C, 1) IfTrueNode(contention_iff); |
0 | 1268 transform_later(contention_true); |
1269 // If contention, loopback and try again. | |
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1270 contended_region->init_req(contended_loopback_path, contention_true); |
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1271 contended_phi_rawmem->init_req(contended_loopback_path, store_eden_top); |
0 | 1272 |
1273 // Fast-path succeeded with no contention! | |
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1274 Node *contention_false = new (C, 1) IfFalseNode(contention_iff); |
0 | 1275 transform_later(contention_false); |
1276 fast_oop_ctrl = contention_false; | |
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1277 |
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1278 // Bump total allocated bytes for this thread |
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1279 Node* thread = new (C, 1) ThreadLocalNode(); |
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1280 transform_later(thread); |
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1281 Node* alloc_bytes_adr = basic_plus_adr(top()/*not oop*/, thread, |
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1282 in_bytes(JavaThread::allocated_bytes_offset())); |
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1283 Node* alloc_bytes = make_load(fast_oop_ctrl, store_eden_top, alloc_bytes_adr, |
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1284 0, TypeLong::LONG, T_LONG); |
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1285 #ifdef _LP64 |
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1286 Node* alloc_size = size_in_bytes; |
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1287 #else |
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1288 Node* alloc_size = new (C, 2) ConvI2LNode(size_in_bytes); |
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1289 transform_later(alloc_size); |
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1290 #endif |
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1291 Node* new_alloc_bytes = new (C, 3) AddLNode(alloc_bytes, alloc_size); |
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1292 transform_later(new_alloc_bytes); |
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1293 fast_oop_rawmem = make_store(fast_oop_ctrl, store_eden_top, alloc_bytes_adr, |
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1294 0, new_alloc_bytes, T_LONG); |
0 | 1295 } |
1296 | |
1297 fast_oop_rawmem = initialize_object(alloc, | |
1298 fast_oop_ctrl, fast_oop_rawmem, fast_oop, | |
1299 klass_node, length, size_in_bytes); | |
1300 | |
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1301 if (C->env()->dtrace_extended_probes()) { |
0 | 1302 // Slow-path call |
1303 int size = TypeFunc::Parms + 2; | |
1304 CallLeafNode *call = new (C, size) CallLeafNode(OptoRuntime::dtrace_object_alloc_Type(), | |
1305 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc_base), | |
1306 "dtrace_object_alloc", | |
1307 TypeRawPtr::BOTTOM); | |
1308 | |
1309 // Get base of thread-local storage area | |
1310 Node* thread = new (C, 1) ThreadLocalNode(); | |
1311 transform_later(thread); | |
1312 | |
1313 call->init_req(TypeFunc::Parms+0, thread); | |
1314 call->init_req(TypeFunc::Parms+1, fast_oop); | |
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1315 call->init_req(TypeFunc::Control, fast_oop_ctrl); |
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1316 call->init_req(TypeFunc::I_O , top()); // does no i/o |
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1317 call->init_req(TypeFunc::Memory , fast_oop_rawmem); |
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1318 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr)); |
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1319 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr)); |
0 | 1320 transform_later(call); |
1321 fast_oop_ctrl = new (C, 1) ProjNode(call,TypeFunc::Control); | |
1322 transform_later(fast_oop_ctrl); | |
1323 fast_oop_rawmem = new (C, 1) ProjNode(call,TypeFunc::Memory); | |
1324 transform_later(fast_oop_rawmem); | |
1325 } | |
1326 | |
1327 // Plug in the successful fast-path into the result merge point | |
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1328 result_region ->init_req(fast_result_path, fast_oop_ctrl); |
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1329 result_phi_rawoop->init_req(fast_result_path, fast_oop); |
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1330 result_phi_i_o ->init_req(fast_result_path, i_o); |
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1331 result_phi_rawmem->init_req(fast_result_path, fast_oop_rawmem); |
0 | 1332 } else { |
1333 slow_region = ctrl; | |
1334 } | |
1335 | |
1336 // Generate slow-path call | |
1337 CallNode *call = new (C, slow_call_type->domain()->cnt()) | |
1338 CallStaticJavaNode(slow_call_type, slow_call_address, | |
1339 OptoRuntime::stub_name(slow_call_address), | |
1340 alloc->jvms()->bci(), | |
1341 TypePtr::BOTTOM); | |
1342 call->init_req( TypeFunc::Control, slow_region ); | |
1343 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1344 call->init_req( TypeFunc::Memory , slow_mem ); // may gc ptrs | |
1345 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1346 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1347 | |
1348 call->init_req(TypeFunc::Parms+0, klass_node); | |
1349 if (length != NULL) { | |
1350 call->init_req(TypeFunc::Parms+1, length); | |
1351 } | |
1352 | |
1353 // Copy debug information and adjust JVMState information, then replace | |
1354 // allocate node with the call | |
1355 copy_call_debug_info((CallNode *) alloc, call); | |
1356 if (!always_slow) { | |
1357 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
1358 } | |
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1359 _igvn.replace_node(alloc, call); |
0 | 1360 transform_later(call); |
1361 | |
1362 // Identify the output projections from the allocate node and | |
1363 // adjust any references to them. | |
1364 // The control and io projections look like: | |
1365 // | |
1366 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl) | |
1367 // Allocate Catch | |
1368 // ^---Proj(io) <-------+ ^---CatchProj(io) | |
1369 // | |
1370 // We are interested in the CatchProj nodes. | |
1371 // | |
1372 extract_call_projections(call); | |
1373 | |
1374 // An allocate node has separate memory projections for the uses on the control and i_o paths | |
1375 // Replace uses of the control memory projection with result_phi_rawmem (unless we are only generating a slow call) | |
1376 if (!always_slow && _memproj_fallthrough != NULL) { | |
1377 for (DUIterator_Fast imax, i = _memproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1378 Node *use = _memproj_fallthrough->fast_out(i); | |
1379 _igvn.hash_delete(use); | |
1380 imax -= replace_input(use, _memproj_fallthrough, result_phi_rawmem); | |
1381 _igvn._worklist.push(use); | |
1382 // back up iterator | |
1383 --i; | |
1384 } | |
1385 } | |
1386 // Now change uses of _memproj_catchall to use _memproj_fallthrough and delete _memproj_catchall so | |
1387 // we end up with a call that has only 1 memory projection | |
1388 if (_memproj_catchall != NULL ) { | |
1389 if (_memproj_fallthrough == NULL) { | |
1390 _memproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::Memory); | |
1391 transform_later(_memproj_fallthrough); | |
1392 } | |
1393 for (DUIterator_Fast imax, i = _memproj_catchall->fast_outs(imax); i < imax; i++) { | |
1394 Node *use = _memproj_catchall->fast_out(i); | |
1395 _igvn.hash_delete(use); | |
1396 imax -= replace_input(use, _memproj_catchall, _memproj_fallthrough); | |
1397 _igvn._worklist.push(use); | |
1398 // back up iterator | |
1399 --i; | |
1400 } | |
1401 } | |
1402 | |
1403 // An allocate node has separate i_o projections for the uses on the control and i_o paths | |
1404 // Replace uses of the control i_o projection with result_phi_i_o (unless we are only generating a slow call) | |
1405 if (_ioproj_fallthrough == NULL) { | |
1406 _ioproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::I_O); | |
1407 transform_later(_ioproj_fallthrough); | |
1408 } else if (!always_slow) { | |
1409 for (DUIterator_Fast imax, i = _ioproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1410 Node *use = _ioproj_fallthrough->fast_out(i); | |
1411 | |
1412 _igvn.hash_delete(use); | |
1413 imax -= replace_input(use, _ioproj_fallthrough, result_phi_i_o); | |
1414 _igvn._worklist.push(use); | |
1415 // back up iterator | |
1416 --i; | |
1417 } | |
1418 } | |
1419 // Now change uses of _ioproj_catchall to use _ioproj_fallthrough and delete _ioproj_catchall so | |
1420 // we end up with a call that has only 1 control projection | |
1421 if (_ioproj_catchall != NULL ) { | |
1422 for (DUIterator_Fast imax, i = _ioproj_catchall->fast_outs(imax); i < imax; i++) { | |
1423 Node *use = _ioproj_catchall->fast_out(i); | |
1424 _igvn.hash_delete(use); | |
1425 imax -= replace_input(use, _ioproj_catchall, _ioproj_fallthrough); | |
1426 _igvn._worklist.push(use); | |
1427 // back up iterator | |
1428 --i; | |
1429 } | |
1430 } | |
1431 | |
1432 // if we generated only a slow call, we are done | |
1433 if (always_slow) | |
1434 return; | |
1435 | |
1436 | |
1437 if (_fallthroughcatchproj != NULL) { | |
1438 ctrl = _fallthroughcatchproj->clone(); | |
1439 transform_later(ctrl); | |
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1440 _igvn.replace_node(_fallthroughcatchproj, result_region); |
0 | 1441 } else { |
1442 ctrl = top(); | |
1443 } | |
1444 Node *slow_result; | |
1445 if (_resproj == NULL) { | |
1446 // no uses of the allocation result | |
1447 slow_result = top(); | |
1448 } else { | |
1449 slow_result = _resproj->clone(); | |
1450 transform_later(slow_result); | |
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1451 _igvn.replace_node(_resproj, result_phi_rawoop); |
0 | 1452 } |
1453 | |
1454 // Plug slow-path into result merge point | |
1455 result_region ->init_req( slow_result_path, ctrl ); | |
1456 result_phi_rawoop->init_req( slow_result_path, slow_result); | |
1457 result_phi_rawmem->init_req( slow_result_path, _memproj_fallthrough ); | |
1458 transform_later(result_region); | |
1459 transform_later(result_phi_rawoop); | |
1460 transform_later(result_phi_rawmem); | |
1461 transform_later(result_phi_i_o); | |
1462 // This completes all paths into the result merge point | |
1463 } | |
1464 | |
1465 | |
1466 // Helper for PhaseMacroExpand::expand_allocate_common. | |
1467 // Initializes the newly-allocated storage. | |
1468 Node* | |
1469 PhaseMacroExpand::initialize_object(AllocateNode* alloc, | |
1470 Node* control, Node* rawmem, Node* object, | |
1471 Node* klass_node, Node* length, | |
1472 Node* size_in_bytes) { | |
1473 InitializeNode* init = alloc->initialization(); | |
1474 // Store the klass & mark bits | |
1475 Node* mark_node = NULL; | |
1476 // For now only enable fast locking for non-array types | |
1477 if (UseBiasedLocking && (length == NULL)) { | |
1609 | 1478 mark_node = make_load(control, rawmem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeRawPtr::BOTTOM, T_ADDRESS); |
0 | 1479 } else { |
1480 mark_node = makecon(TypeRawPtr::make((address)markOopDesc::prototype())); | |
1481 } | |
1482 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS); | |
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1483 |
0 | 1484 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_OBJECT); |
1485 int header_size = alloc->minimum_header_size(); // conservatively small | |
1486 | |
1487 // Array length | |
1488 if (length != NULL) { // Arrays need length field | |
1489 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT); | |
1490 // conservatively small header size: | |
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1491 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE); |
0 | 1492 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass(); |
1493 if (k->is_array_klass()) // we know the exact header size in most cases: | |
1494 header_size = Klass::layout_helper_header_size(k->layout_helper()); | |
1495 } | |
1496 | |
1497 // Clear the object body, if necessary. | |
1498 if (init == NULL) { | |
1499 // The init has somehow disappeared; be cautious and clear everything. | |
1500 // | |
1501 // This can happen if a node is allocated but an uncommon trap occurs | |
1502 // immediately. In this case, the Initialize gets associated with the | |
1503 // trap, and may be placed in a different (outer) loop, if the Allocate | |
1504 // is in a loop. If (this is rare) the inner loop gets unrolled, then | |
1505 // there can be two Allocates to one Initialize. The answer in all these | |
1506 // edge cases is safety first. It is always safe to clear immediately | |
1507 // within an Allocate, and then (maybe or maybe not) clear some more later. | |
1508 if (!ZeroTLAB) | |
1509 rawmem = ClearArrayNode::clear_memory(control, rawmem, object, | |
1510 header_size, size_in_bytes, | |
1511 &_igvn); | |
1512 } else { | |
1513 if (!init->is_complete()) { | |
1514 // Try to win by zeroing only what the init does not store. | |
1515 // We can also try to do some peephole optimizations, | |
1516 // such as combining some adjacent subword stores. | |
1517 rawmem = init->complete_stores(control, rawmem, object, | |
1518 header_size, size_in_bytes, &_igvn); | |
1519 } | |
1520 // We have no more use for this link, since the AllocateNode goes away: | |
1521 init->set_req(InitializeNode::RawAddress, top()); | |
1522 // (If we keep the link, it just confuses the register allocator, | |
1523 // who thinks he sees a real use of the address by the membar.) | |
1524 } | |
1525 | |
1526 return rawmem; | |
1527 } | |
1528 | |
1529 // Generate prefetch instructions for next allocations. | |
1530 Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false, | |
1531 Node*& contended_phi_rawmem, | |
1532 Node* old_eden_top, Node* new_eden_top, | |
1533 Node* length) { | |
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1534 enum { fall_in_path = 1, pf_path = 2 }; |
0 | 1535 if( UseTLAB && AllocatePrefetchStyle == 2 ) { |
1536 // Generate prefetch allocation with watermark check. | |
1537 // As an allocation hits the watermark, we will prefetch starting | |
1538 // at a "distance" away from watermark. | |
1539 | |
1540 Node *pf_region = new (C, 3) RegionNode(3); | |
1541 Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY, | |
1542 TypeRawPtr::BOTTOM ); | |
1543 // I/O is used for Prefetch | |
1544 Node *pf_phi_abio = new (C, 3) PhiNode( pf_region, Type::ABIO ); | |
1545 | |
1546 Node *thread = new (C, 1) ThreadLocalNode(); | |
1547 transform_later(thread); | |
1548 | |
1549 Node *eden_pf_adr = new (C, 4) AddPNode( top()/*not oop*/, thread, | |
1550 _igvn.MakeConX(in_bytes(JavaThread::tlab_pf_top_offset())) ); | |
1551 transform_later(eden_pf_adr); | |
1552 | |
1553 Node *old_pf_wm = new (C, 3) LoadPNode( needgc_false, | |
1554 contended_phi_rawmem, eden_pf_adr, | |
1555 TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); | |
1556 transform_later(old_pf_wm); | |
1557 | |
1558 // check against new_eden_top | |
1559 Node *need_pf_cmp = new (C, 3) CmpPNode( new_eden_top, old_pf_wm ); | |
1560 transform_later(need_pf_cmp); | |
1561 Node *need_pf_bol = new (C, 2) BoolNode( need_pf_cmp, BoolTest::ge ); | |
1562 transform_later(need_pf_bol); | |
1563 IfNode *need_pf_iff = new (C, 2) IfNode( needgc_false, need_pf_bol, | |
1564 PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); | |
1565 transform_later(need_pf_iff); | |
1566 | |
1567 // true node, add prefetchdistance | |
1568 Node *need_pf_true = new (C, 1) IfTrueNode( need_pf_iff ); | |
1569 transform_later(need_pf_true); | |
1570 | |
1571 Node *need_pf_false = new (C, 1) IfFalseNode( need_pf_iff ); | |
1572 transform_later(need_pf_false); | |
1573 | |
1574 Node *new_pf_wmt = new (C, 4) AddPNode( top(), old_pf_wm, | |
1575 _igvn.MakeConX(AllocatePrefetchDistance) ); | |
1576 transform_later(new_pf_wmt ); | |
1577 new_pf_wmt->set_req(0, need_pf_true); | |
1578 | |
1579 Node *store_new_wmt = new (C, 4) StorePNode( need_pf_true, | |
1580 contended_phi_rawmem, eden_pf_adr, | |
1581 TypeRawPtr::BOTTOM, new_pf_wmt ); | |
1582 transform_later(store_new_wmt); | |
1583 | |
1584 // adding prefetches | |
1585 pf_phi_abio->init_req( fall_in_path, i_o ); | |
1586 | |
1587 Node *prefetch_adr; | |
1588 Node *prefetch; | |
1589 uint lines = AllocatePrefetchDistance / AllocatePrefetchStepSize; | |
1590 uint step_size = AllocatePrefetchStepSize; | |
1591 uint distance = 0; | |
1592 | |
1593 for ( uint i = 0; i < lines; i++ ) { | |
1594 prefetch_adr = new (C, 4) AddPNode( old_pf_wm, new_pf_wmt, | |
1595 _igvn.MakeConX(distance) ); | |
1596 transform_later(prefetch_adr); | |
1597 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1598 transform_later(prefetch); | |
1599 distance += step_size; | |
1600 i_o = prefetch; | |
1601 } | |
1602 pf_phi_abio->set_req( pf_path, i_o ); | |
1603 | |
1604 pf_region->init_req( fall_in_path, need_pf_false ); | |
1605 pf_region->init_req( pf_path, need_pf_true ); | |
1606 | |
1607 pf_phi_rawmem->init_req( fall_in_path, contended_phi_rawmem ); | |
1608 pf_phi_rawmem->init_req( pf_path, store_new_wmt ); | |
1609 | |
1610 transform_later(pf_region); | |
1611 transform_later(pf_phi_rawmem); | |
1612 transform_later(pf_phi_abio); | |
1613 | |
1614 needgc_false = pf_region; | |
1615 contended_phi_rawmem = pf_phi_rawmem; | |
1616 i_o = pf_phi_abio; | |
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1617 } else if( UseTLAB && AllocatePrefetchStyle == 3 ) { |
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1618 // Insert a prefetch for each allocation only on the fast-path |
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1619 Node *pf_region = new (C, 3) RegionNode(3); |
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1620 Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY, |
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1621 TypeRawPtr::BOTTOM ); |
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1622 |
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1623 // Generate several prefetch instructions only for arrays. |
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1624 uint lines = (length != NULL) ? AllocatePrefetchLines : 1; |
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1625 uint step_size = AllocatePrefetchStepSize; |
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1626 uint distance = AllocatePrefetchDistance; |
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1627 |
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1628 // Next cache address. |
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1629 Node *cache_adr = new (C, 4) AddPNode(old_eden_top, old_eden_top, |
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1630 _igvn.MakeConX(distance)); |
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1631 transform_later(cache_adr); |
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1632 cache_adr = new (C, 2) CastP2XNode(needgc_false, cache_adr); |
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1633 transform_later(cache_adr); |
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1634 Node* mask = _igvn.MakeConX(~(intptr_t)(step_size-1)); |
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1635 cache_adr = new (C, 3) AndXNode(cache_adr, mask); |
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1636 transform_later(cache_adr); |
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1637 cache_adr = new (C, 2) CastX2PNode(cache_adr); |
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1638 transform_later(cache_adr); |
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1639 |
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1640 // Prefetch |
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1641 Node *prefetch = new (C, 3) PrefetchWriteNode( contended_phi_rawmem, cache_adr ); |
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1642 prefetch->set_req(0, needgc_false); |
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1643 transform_later(prefetch); |
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1644 contended_phi_rawmem = prefetch; |
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1645 Node *prefetch_adr; |
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1646 distance = step_size; |
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1647 for ( uint i = 1; i < lines; i++ ) { |
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1648 prefetch_adr = new (C, 4) AddPNode( cache_adr, cache_adr, |
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1649 _igvn.MakeConX(distance) ); |
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1650 transform_later(prefetch_adr); |
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1651 prefetch = new (C, 3) PrefetchWriteNode( contended_phi_rawmem, prefetch_adr ); |
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1652 transform_later(prefetch); |
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1653 distance += step_size; |
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1654 contended_phi_rawmem = prefetch; |
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1655 } |
0 | 1656 } else if( AllocatePrefetchStyle > 0 ) { |
1657 // Insert a prefetch for each allocation only on the fast-path | |
1658 Node *prefetch_adr; | |
1659 Node *prefetch; | |
1660 // Generate several prefetch instructions only for arrays. | |
1661 uint lines = (length != NULL) ? AllocatePrefetchLines : 1; | |
1662 uint step_size = AllocatePrefetchStepSize; | |
1663 uint distance = AllocatePrefetchDistance; | |
1664 for ( uint i = 0; i < lines; i++ ) { | |
1665 prefetch_adr = new (C, 4) AddPNode( old_eden_top, new_eden_top, | |
1666 _igvn.MakeConX(distance) ); | |
1667 transform_later(prefetch_adr); | |
1668 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1669 // Do not let it float too high, since if eden_top == eden_end, | |
1670 // both might be null. | |
1671 if( i == 0 ) { // Set control for first prefetch, next follows it | |
1672 prefetch->init_req(0, needgc_false); | |
1673 } | |
1674 transform_later(prefetch); | |
1675 distance += step_size; | |
1676 i_o = prefetch; | |
1677 } | |
1678 } | |
1679 return i_o; | |
1680 } | |
1681 | |
1682 | |
1683 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) { | |
1684 expand_allocate_common(alloc, NULL, | |
1685 OptoRuntime::new_instance_Type(), | |
1686 OptoRuntime::new_instance_Java()); | |
1687 } | |
1688 | |
1689 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) { | |
1690 Node* length = alloc->in(AllocateNode::ALength); | |
1691 expand_allocate_common(alloc, length, | |
1692 OptoRuntime::new_array_Type(), | |
1693 OptoRuntime::new_array_Java()); | |
1694 } | |
1695 | |
1696 | |
1697 // we have determined that this lock/unlock can be eliminated, we simply | |
1698 // eliminate the node without expanding it. | |
1699 // | |
1700 // Note: The membar's associated with the lock/unlock are currently not | |
1701 // eliminated. This should be investigated as a future enhancement. | |
1702 // | |
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1703 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) { |
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1704 |
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1705 if (!alock->is_eliminated()) { |
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1706 return false; |
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1707 } |
460
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1708 if (alock->is_Lock() && !alock->is_coarsened()) { |
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1709 // Create new "eliminated" BoxLock node and use it |
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1710 // in monitor debug info for the same object. |
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1711 BoxLockNode* oldbox = alock->box_node()->as_BoxLock(); |
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1712 Node* obj = alock->obj_node(); |
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1713 if (!oldbox->is_eliminated()) { |
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1714 BoxLockNode* newbox = oldbox->clone()->as_BoxLock(); |
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1715 newbox->set_eliminated(); |
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1716 transform_later(newbox); |
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1717 // Replace old box node with new box for all users |
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1718 // of the same object. |
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1719 for (uint i = 0; i < oldbox->outcnt();) { |
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1720 |
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1721 bool next_edge = true; |
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1722 Node* u = oldbox->raw_out(i); |
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1723 if (u == alock) { |
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1724 i++; |
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1725 continue; // It will be removed below |
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1726 } |
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1727 if (u->is_Lock() && |
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1728 u->as_Lock()->obj_node() == obj && |
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1729 // oldbox could be referenced in debug info also |
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1730 u->as_Lock()->box_node() == oldbox) { |
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1731 assert(u->as_Lock()->is_eliminated(), "sanity"); |
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1732 _igvn.hash_delete(u); |
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1733 u->set_req(TypeFunc::Parms + 1, newbox); |
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1734 next_edge = false; |
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1735 #ifdef ASSERT |
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changeset
|
1736 } else if (u->is_Unlock() && u->as_Unlock()->obj_node() == obj) { |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1737 assert(u->as_Unlock()->is_eliminated(), "sanity"); |
424f9bfe6b96
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kvn
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diff
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|
1738 #endif |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1739 } |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
changeset
|
1740 // Replace old box in monitor debug info. |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
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|
1741 if (u->is_SafePoint() && u->as_SafePoint()->jvms()) { |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
changeset
|
1742 SafePointNode* sfn = u->as_SafePoint(); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1743 JVMState* youngest_jvms = sfn->jvms(); |
424f9bfe6b96
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|
1744 int max_depth = youngest_jvms->depth(); |
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|
1745 for (int depth = 1; depth <= max_depth; depth++) { |
424f9bfe6b96
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|
1746 JVMState* jvms = youngest_jvms->of_depth(depth); |
424f9bfe6b96
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|
1747 int num_mon = jvms->nof_monitors(); |
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|
1748 // Loop over monitors |
424f9bfe6b96
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|
1749 for (int idx = 0; idx < num_mon; idx++) { |
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|
1750 Node* obj_node = sfn->monitor_obj(jvms, idx); |
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|
1751 Node* box_node = sfn->monitor_box(jvms, idx); |
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|
1752 if (box_node == oldbox && obj_node == obj) { |
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|
1753 int j = jvms->monitor_box_offset(idx); |
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|
1754 _igvn.hash_delete(u); |
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|
1755 u->set_req(j, newbox); |
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|
1756 next_edge = false; |
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|
1757 } |
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|
1758 } // for (int idx = 0; |
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|
1759 } // for (int depth = 1; |
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|
1760 } // if (u->is_SafePoint() |
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|
1761 if (next_edge) i++; |
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|
1762 } // for (uint i = 0; i < oldbox->outcnt();) |
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|
1763 } // if (!oldbox->is_eliminated()) |
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|
1764 } // if (alock->is_Lock() && !lock->is_coarsened()) |
66
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|
1765 |
1080
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
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diff
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|
1766 CompileLog* log = C->log(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
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diff
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|
1767 if (log != NULL) { |
7c57aead6d3e
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never
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diff
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|
1768 log->head("eliminate_lock lock='%d'", |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1769 alock->is_Lock()); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1770 JVMState* p = alock->jvms(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
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diff
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|
1771 while (p != NULL) { |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
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diff
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|
1772 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
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diff
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|
1773 p = p->caller(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
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diff
changeset
|
1774 } |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1775 log->tail("eliminate_lock"); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
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diff
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|
1776 } |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
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diff
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|
1777 |
66
6dbf1a175d6b
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|
1778 #ifndef PRODUCT |
6dbf1a175d6b
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|
1779 if (PrintEliminateLocks) { |
6dbf1a175d6b
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diff
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|
1780 if (alock->is_Lock()) { |
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changeset
|
1781 tty->print_cr("++++ Eliminating: %d Lock", alock->_idx); |
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|
1782 } else { |
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|
1783 tty->print_cr("++++ Eliminating: %d Unlock", alock->_idx); |
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|
1784 } |
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diff
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|
1785 } |
6dbf1a175d6b
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diff
changeset
|
1786 #endif |
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diff
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|
1787 |
6dbf1a175d6b
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diff
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|
1788 Node* mem = alock->in(TypeFunc::Memory); |
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|
1789 Node* ctrl = alock->in(TypeFunc::Control); |
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|
1790 |
6dbf1a175d6b
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diff
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|
1791 extract_call_projections(alock); |
6dbf1a175d6b
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|
1792 // There are 2 projections from the lock. The lock node will |
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|
1793 // be deleted when its last use is subsumed below. |
6dbf1a175d6b
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|
1794 assert(alock->outcnt() == 2 && |
6dbf1a175d6b
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diff
changeset
|
1795 _fallthroughproj != NULL && |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
kvn
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diff
changeset
|
1796 _memproj_fallthrough != NULL, |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1797 "Unexpected projections from Lock/Unlock"); |
6dbf1a175d6b
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diff
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|
1798 |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1799 Node* fallthroughproj = _fallthroughproj; |
6dbf1a175d6b
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|
1800 Node* memproj_fallthrough = _memproj_fallthrough; |
0 | 1801 |
1802 // The memory projection from a lock/unlock is RawMem | |
1803 // The input to a Lock is merged memory, so extract its RawMem input | |
1804 // (unless the MergeMem has been optimized away.) | |
1805 if (alock->is_Lock()) { | |
66
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|
1806 // Seach for MemBarAcquire node and delete it also. |
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|
1807 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar(); |
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|
1808 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquire, ""); |
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|
1809 Node* ctrlproj = membar->proj_out(TypeFunc::Control); |
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|
1810 Node* memproj = membar->proj_out(TypeFunc::Memory); |
708
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|
1811 _igvn.replace_node(ctrlproj, fallthroughproj); |
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6711117: Assertion in 64bit server vm (flat != TypePtr::BOTTOM,"cannot alias-analyze an untyped ptr")
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|
1812 _igvn.replace_node(memproj, memproj_fallthrough); |
460
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|
1813 |
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1814 // Delete FastLock node also if this Lock node is unique user |
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|
1815 // (a loop peeling may clone a Lock node). |
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|
1816 Node* flock = alock->as_Lock()->fastlock_node(); |
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|
1817 if (flock->outcnt() == 1) { |
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|
1818 assert(flock->unique_out() == alock, "sanity"); |
708
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|
1819 _igvn.replace_node(flock, top()); |
460
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|
1820 } |
0 | 1821 } |
1822 | |
66
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|
1823 // Seach for MemBarRelease node and delete it also. |
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|
1824 if (alock->is_Unlock() && ctrl != NULL && ctrl->is_Proj() && |
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|
1825 ctrl->in(0)->is_MemBar()) { |
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|
1826 MemBarNode* membar = ctrl->in(0)->as_MemBar(); |
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|
1827 assert(membar->Opcode() == Op_MemBarRelease && |
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|
1828 mem->is_Proj() && membar == mem->in(0), ""); |
708
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|
1829 _igvn.replace_node(fallthroughproj, ctrl); |
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|
1830 _igvn.replace_node(memproj_fallthrough, mem); |
66
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|
1831 fallthroughproj = ctrl; |
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|
1832 memproj_fallthrough = mem; |
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|
1833 ctrl = membar->in(TypeFunc::Control); |
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|
1834 mem = membar->in(TypeFunc::Memory); |
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|
1835 } |
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|
1836 |
708
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|
1837 _igvn.replace_node(fallthroughproj, ctrl); |
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|
1838 _igvn.replace_node(memproj_fallthrough, mem); |
66
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|
1839 return true; |
0 | 1840 } |
1841 | |
1842 | |
1843 //------------------------------expand_lock_node---------------------- | |
1844 void PhaseMacroExpand::expand_lock_node(LockNode *lock) { | |
1845 | |
1846 Node* ctrl = lock->in(TypeFunc::Control); | |
1847 Node* mem = lock->in(TypeFunc::Memory); | |
1848 Node* obj = lock->obj_node(); | |
1849 Node* box = lock->box_node(); | |
66
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|
1850 Node* flock = lock->fastlock_node(); |
0 | 1851 |
1852 // Make the merge point | |
420
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|
1853 Node *region; |
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|
1854 Node *mem_phi; |
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|
1855 Node *slow_path; |
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|
1856 |
a1980da045cc
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|
1857 if (UseOptoBiasInlining) { |
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|
1858 /* |
605 | 1859 * See the full description in MacroAssembler::biased_locking_enter(). |
420
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|
1860 * |
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|
1861 * if( (mark_word & biased_lock_mask) == biased_lock_pattern ) { |
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|
1862 * // The object is biased. |
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|
1863 * proto_node = klass->prototype_header; |
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|
1864 * o_node = thread | proto_node; |
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|
1865 * x_node = o_node ^ mark_word; |
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|
1866 * if( (x_node & ~age_mask) == 0 ) { // Biased to the current thread ? |
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|
1867 * // Done. |
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|
1868 * } else { |
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|
1869 * if( (x_node & biased_lock_mask) != 0 ) { |
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|
1870 * // The klass's prototype header is no longer biased. |
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1871 * cas(&mark_word, mark_word, proto_node) |
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|
1872 * goto cas_lock; |
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|
1873 * } else { |
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|
1874 * // The klass's prototype header is still biased. |
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1875 * if( (x_node & epoch_mask) != 0 ) { // Expired epoch? |
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|
1876 * old = mark_word; |
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|
1877 * new = o_node; |
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|
1878 * } else { |
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|
1879 * // Different thread or anonymous biased. |
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1880 * old = mark_word & (epoch_mask | age_mask | biased_lock_mask); |
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1881 * new = thread | old; |
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|
1882 * } |
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|
1883 * // Try to rebias. |
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1884 * if( cas(&mark_word, old, new) == 0 ) { |
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|
1885 * // Done. |
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|
1886 * } else { |
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|
1887 * goto slow_path; // Failed. |
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|
1888 * } |
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|
1889 * } |
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|
1890 * } |
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|
1891 * } else { |
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|
1892 * // The object is not biased. |
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|
1893 * cas_lock: |
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diff
changeset
|
1894 * if( FastLock(obj) == 0 ) { |
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|
1895 * // Done. |
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|
1896 * } else { |
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|
1897 * slow_path: |
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|
1898 * OptoRuntime::complete_monitor_locking_Java(obj); |
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|
1899 * } |
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|
1900 * } |
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|
1901 */ |
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|
1902 |
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|
1903 region = new (C, 5) RegionNode(5); |
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|
1904 // create a Phi for the memory state |
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1905 mem_phi = new (C, 5) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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|
1906 |
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1907 Node* fast_lock_region = new (C, 3) RegionNode(3); |
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1908 Node* fast_lock_mem_phi = new (C, 3) PhiNode( fast_lock_region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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|
1909 |
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1910 // First, check mark word for the biased lock pattern. |
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1911 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
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|
1912 |
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1913 // Get fast path - mark word has the biased lock pattern. |
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1914 ctrl = opt_bits_test(ctrl, fast_lock_region, 1, mark_node, |
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1915 markOopDesc::biased_lock_mask_in_place, |
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1916 markOopDesc::biased_lock_pattern, true); |
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1917 // fast_lock_region->in(1) is set to slow path. |
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1918 fast_lock_mem_phi->init_req(1, mem); |
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1919 |
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1920 // Now check that the lock is biased to the current thread and has |
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1921 // the same epoch and bias as Klass::_prototype_header. |
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1922 |
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1923 // Special-case a fresh allocation to avoid building nodes: |
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1924 Node* klass_node = AllocateNode::Ideal_klass(obj, &_igvn); |
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1925 if (klass_node == NULL) { |
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1926 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); |
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1927 klass_node = transform_later( LoadKlassNode::make(_igvn, mem, k_adr, _igvn.type(k_adr)->is_ptr()) ); |
490
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1928 #ifdef _LP64 |
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1929 if (UseCompressedOops && klass_node->is_DecodeN()) { |
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1930 assert(klass_node->in(1)->Opcode() == Op_LoadNKlass, "sanity"); |
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1931 klass_node->in(1)->init_req(0, ctrl); |
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1932 } else |
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1933 #endif |
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1934 klass_node->init_req(0, ctrl); |
420
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1935 } |
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1936 Node *proto_node = make_load(ctrl, mem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeX_X, TypeX_X->basic_type()); |
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1937 |
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1938 Node* thread = transform_later(new (C, 1) ThreadLocalNode()); |
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1939 Node* cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread)); |
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1940 Node* o_node = transform_later(new (C, 3) OrXNode(cast_thread, proto_node)); |
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1941 Node* x_node = transform_later(new (C, 3) XorXNode(o_node, mark_node)); |
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1942 |
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1943 // Get slow path - mark word does NOT match the value. |
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1944 Node* not_biased_ctrl = opt_bits_test(ctrl, region, 3, x_node, |
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1945 (~markOopDesc::age_mask_in_place), 0); |
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1946 // region->in(3) is set to fast path - the object is biased to the current thread. |
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1947 mem_phi->init_req(3, mem); |
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|
1948 |
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1949 |
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1950 // Mark word does NOT match the value (thread | Klass::_prototype_header). |
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1951 |
0 | 1952 |
420
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1953 // First, check biased pattern. |
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1954 // Get fast path - _prototype_header has the same biased lock pattern. |
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1955 ctrl = opt_bits_test(not_biased_ctrl, fast_lock_region, 2, x_node, |
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1956 markOopDesc::biased_lock_mask_in_place, 0, true); |
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1957 |
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1958 not_biased_ctrl = fast_lock_region->in(2); // Slow path |
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1959 // fast_lock_region->in(2) - the prototype header is no longer biased |
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1960 // and we have to revoke the bias on this object. |
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1961 // We are going to try to reset the mark of this object to the prototype |
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1962 // value and fall through to the CAS-based locking scheme. |
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1963 Node* adr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes()); |
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1964 Node* cas = new (C, 5) StoreXConditionalNode(not_biased_ctrl, mem, adr, |
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1965 proto_node, mark_node); |
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1966 transform_later(cas); |
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1967 Node* proj = transform_later( new (C, 1) SCMemProjNode(cas)); |
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1968 fast_lock_mem_phi->init_req(2, proj); |
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|
1969 |
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1970 |
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|
1971 // Second, check epoch bits. |
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1972 Node* rebiased_region = new (C, 3) RegionNode(3); |
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1973 Node* old_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X); |
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1974 Node* new_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X); |
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|
1975 |
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|
1976 // Get slow path - mark word does NOT match epoch bits. |
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1977 Node* epoch_ctrl = opt_bits_test(ctrl, rebiased_region, 1, x_node, |
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1978 markOopDesc::epoch_mask_in_place, 0); |
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1979 // The epoch of the current bias is not valid, attempt to rebias the object |
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|
1980 // toward the current thread. |
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1981 rebiased_region->init_req(2, epoch_ctrl); |
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1982 old_phi->init_req(2, mark_node); |
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1983 new_phi->init_req(2, o_node); |
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|
1984 |
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1985 // rebiased_region->in(1) is set to fast path. |
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|
1986 // The epoch of the current bias is still valid but we know |
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1987 // nothing about the owner; it might be set or it might be clear. |
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1988 Node* cmask = MakeConX(markOopDesc::biased_lock_mask_in_place | |
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|
1989 markOopDesc::age_mask_in_place | |
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|
1990 markOopDesc::epoch_mask_in_place); |
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1991 Node* old = transform_later(new (C, 3) AndXNode(mark_node, cmask)); |
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1992 cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread)); |
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1993 Node* new_mark = transform_later(new (C, 3) OrXNode(cast_thread, old)); |
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1994 old_phi->init_req(1, old); |
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1995 new_phi->init_req(1, new_mark); |
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|
1996 |
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1997 transform_later(rebiased_region); |
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|
1998 transform_later(old_phi); |
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|
1999 transform_later(new_phi); |
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|
2000 |
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2001 // Try to acquire the bias of the object using an atomic operation. |
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2002 // If this fails we will go in to the runtime to revoke the object's bias. |
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2003 cas = new (C, 5) StoreXConditionalNode(rebiased_region, mem, adr, |
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2004 new_phi, old_phi); |
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2005 transform_later(cas); |
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2006 proj = transform_later( new (C, 1) SCMemProjNode(cas)); |
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2007 |
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2008 // Get slow path - Failed to CAS. |
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2009 not_biased_ctrl = opt_bits_test(rebiased_region, region, 4, cas, 0, 0); |
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2010 mem_phi->init_req(4, proj); |
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2011 // region->in(4) is set to fast path - the object is rebiased to the current thread. |
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2012 |
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2013 // Failed to CAS. |
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2014 slow_path = new (C, 3) RegionNode(3); |
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2015 Node *slow_mem = new (C, 3) PhiNode( slow_path, Type::MEMORY, TypeRawPtr::BOTTOM); |
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2016 |
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2017 slow_path->init_req(1, not_biased_ctrl); // Capture slow-control |
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2018 slow_mem->init_req(1, proj); |
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2019 |
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2020 // Call CAS-based locking scheme (FastLock node). |
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2021 |
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2022 transform_later(fast_lock_region); |
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2023 transform_later(fast_lock_mem_phi); |
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2024 |
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2025 // Get slow path - FastLock failed to lock the object. |
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2026 ctrl = opt_bits_test(fast_lock_region, region, 2, flock, 0, 0); |
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2027 mem_phi->init_req(2, fast_lock_mem_phi); |
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2028 // region->in(2) is set to fast path - the object is locked to the current thread. |
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2029 |
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2030 slow_path->init_req(2, ctrl); // Capture slow-control |
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2031 slow_mem->init_req(2, fast_lock_mem_phi); |
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2032 |
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2033 transform_later(slow_path); |
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2034 transform_later(slow_mem); |
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2035 // Reset lock's memory edge. |
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2036 lock->set_req(TypeFunc::Memory, slow_mem); |
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2037 |
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2038 } else { |
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2039 region = new (C, 3) RegionNode(3); |
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2040 // create a Phi for the memory state |
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2041 mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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2042 |
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2043 // Optimize test; set region slot 2 |
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2044 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0); |
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2045 mem_phi->init_req(2, mem); |
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2046 } |
0 | 2047 |
2048 // Make slow path call | |
2049 CallNode *call = make_slow_call( (CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(), OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path, obj, box ); | |
2050 | |
2051 extract_call_projections(call); | |
2052 | |
2053 // Slow path can only throw asynchronous exceptions, which are always | |
2054 // de-opted. So the compiler thinks the slow-call can never throw an | |
2055 // exception. If it DOES throw an exception we would need the debug | |
2056 // info removed first (since if it throws there is no monitor). | |
2057 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
2058 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
2059 | |
2060 // Capture slow path | |
2061 // disconnect fall-through projection from call and create a new one | |
2062 // hook up users of fall-through projection to region | |
2063 Node *slow_ctrl = _fallthroughproj->clone(); | |
2064 transform_later(slow_ctrl); | |
2065 _igvn.hash_delete(_fallthroughproj); | |
2066 _fallthroughproj->disconnect_inputs(NULL); | |
2067 region->init_req(1, slow_ctrl); | |
2068 // region inputs are now complete | |
2069 transform_later(region); | |
708
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2070 _igvn.replace_node(_fallthroughproj, region); |
0 | 2071 |
420
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2072 Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) ); |
0 | 2073 mem_phi->init_req(1, memproj ); |
2074 transform_later(mem_phi); | |
708
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2075 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 2076 } |
2077 | |
2078 //------------------------------expand_unlock_node---------------------- | |
2079 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) { | |
2080 | |
66
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2081 Node* ctrl = unlock->in(TypeFunc::Control); |
0 | 2082 Node* mem = unlock->in(TypeFunc::Memory); |
2083 Node* obj = unlock->obj_node(); | |
2084 Node* box = unlock->box_node(); | |
2085 | |
2086 // No need for a null check on unlock | |
2087 | |
2088 // Make the merge point | |
420
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2089 Node *region; |
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2090 Node *mem_phi; |
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2091 |
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2092 if (UseOptoBiasInlining) { |
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2093 // Check for biased locking unlock case, which is a no-op. |
605 | 2094 // See the full description in MacroAssembler::biased_locking_exit(). |
420
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2095 region = new (C, 4) RegionNode(4); |
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2096 // create a Phi for the memory state |
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2097 mem_phi = new (C, 4) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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2098 mem_phi->init_req(3, mem); |
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2099 |
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2100 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
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2101 ctrl = opt_bits_test(ctrl, region, 3, mark_node, |
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2102 markOopDesc::biased_lock_mask_in_place, |
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2103 markOopDesc::biased_lock_pattern); |
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2104 } else { |
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2105 region = new (C, 3) RegionNode(3); |
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2106 // create a Phi for the memory state |
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2107 mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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2108 } |
0 | 2109 |
2110 FastUnlockNode *funlock = new (C, 3) FastUnlockNode( ctrl, obj, box ); | |
2111 funlock = transform_later( funlock )->as_FastUnlock(); | |
2112 // Optimize test; set region slot 2 | |
420
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2113 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0); |
0 | 2114 |
2115 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 ); | |
2116 | |
2117 extract_call_projections(call); | |
2118 | |
2119 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
2120 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
2121 | |
2122 // No exceptions for unlocking | |
2123 // Capture slow path | |
2124 // disconnect fall-through projection from call and create a new one | |
2125 // hook up users of fall-through projection to region | |
2126 Node *slow_ctrl = _fallthroughproj->clone(); | |
2127 transform_later(slow_ctrl); | |
2128 _igvn.hash_delete(_fallthroughproj); | |
2129 _fallthroughproj->disconnect_inputs(NULL); | |
2130 region->init_req(1, slow_ctrl); | |
2131 // region inputs are now complete | |
2132 transform_later(region); | |
708
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2133 _igvn.replace_node(_fallthroughproj, region); |
0 | 2134 |
2135 Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) ); | |
2136 mem_phi->init_req(1, memproj ); | |
2137 mem_phi->init_req(2, mem); | |
2138 transform_later(mem_phi); | |
708
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2139 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 2140 } |
2141 | |
2142 //------------------------------expand_macro_nodes---------------------- | |
2143 // Returns true if a failure occurred. | |
2144 bool PhaseMacroExpand::expand_macro_nodes() { | |
2145 if (C->macro_count() == 0) | |
2146 return false; | |
460
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2147 // First, attempt to eliminate locks |
73
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2148 bool progress = true; |
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2149 while (progress) { |
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2150 progress = false; |
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2151 for (int i = C->macro_count(); i > 0; i--) { |
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2152 Node * n = C->macro_node(i-1); |
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2153 bool success = false; |
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2154 debug_only(int old_macro_count = C->macro_count();); |
460
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2155 if (n->is_AbstractLock()) { |
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2156 success = eliminate_locking_node(n->as_AbstractLock()); |
3345 | 2157 } else if (n->Opcode() == Op_LoopLimit) { |
2158 // Remove it from macro list and put on IGVN worklist to optimize. | |
2159 C->remove_macro_node(n); | |
2160 _igvn._worklist.push(n); | |
2161 success = true; | |
460
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2162 } else if (n->Opcode() == Op_Opaque1 || n->Opcode() == Op_Opaque2) { |
708
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2163 _igvn.replace_node(n, n->in(1)); |
460
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2164 success = true; |
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2165 } |
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2166 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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2167 progress = progress || success; |
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2168 } |
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2169 } |
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2170 // Next, attempt to eliminate allocations |
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2171 progress = true; |
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2172 while (progress) { |
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2173 progress = false; |
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2174 for (int i = C->macro_count(); i > 0; i--) { |
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2175 Node * n = C->macro_node(i-1); |
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2176 bool success = false; |
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2177 debug_only(int old_macro_count = C->macro_count();); |
73
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2178 switch (n->class_id()) { |
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2179 case Node::Class_Allocate: |
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2180 case Node::Class_AllocateArray: |
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2181 success = eliminate_allocate_node(n->as_Allocate()); |
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2182 break; |
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2183 case Node::Class_Lock: |
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2184 case Node::Class_Unlock: |
460
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2185 assert(!n->as_AbstractLock()->is_eliminated(), "sanity"); |
73
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2186 break; |
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2187 default: |
460
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2188 assert(false, "unknown node type in macro list"); |
73
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2189 } |
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2190 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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2191 progress = progress || success; |
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2192 } |
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2193 } |
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2194 // Make sure expansion will not cause node limit to be exceeded. |
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2195 // Worst case is a macro node gets expanded into about 50 nodes. |
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2196 // Allow 50% more for optimization. |
0 | 2197 if (C->check_node_count(C->macro_count() * 75, "out of nodes before macro expansion" ) ) |
2198 return true; | |
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2199 |
0 | 2200 // expand "macro" nodes |
2201 // nodes are removed from the macro list as they are processed | |
2202 while (C->macro_count() > 0) { | |
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2203 int macro_count = C->macro_count(); |
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2204 Node * n = C->macro_node(macro_count-1); |
0 | 2205 assert(n->is_macro(), "only macro nodes expected here"); |
2206 if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) { | |
2207 // node is unreachable, so don't try to expand it | |
2208 C->remove_macro_node(n); | |
2209 continue; | |
2210 } | |
2211 switch (n->class_id()) { | |
2212 case Node::Class_Allocate: | |
2213 expand_allocate(n->as_Allocate()); | |
2214 break; | |
2215 case Node::Class_AllocateArray: | |
2216 expand_allocate_array(n->as_AllocateArray()); | |
2217 break; | |
2218 case Node::Class_Lock: | |
2219 expand_lock_node(n->as_Lock()); | |
2220 break; | |
2221 case Node::Class_Unlock: | |
2222 expand_unlock_node(n->as_Unlock()); | |
2223 break; | |
2224 default: | |
2225 assert(false, "unknown node type in macro list"); | |
2226 } | |
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2227 assert(C->macro_count() < macro_count, "must have deleted a node from macro list"); |
0 | 2228 if (C->failing()) return true; |
2229 } | |
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2230 |
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2231 _igvn.set_delay_transform(false); |
0 | 2232 _igvn.optimize(); |
2233 return false; | |
2234 } |