Mercurial > hg > truffle
annotate src/share/vm/opto/macro.cpp @ 1368:93767e6a2dfd
6941529: SharedRuntime::raw_exception_handler_for_return_address must reset thread MethodHandle flag
Summary: During testing a bug was hit when an exception returned to the interpreter and the SP was wrong.
Reviewed-by: kvn, never
author | twisti |
---|---|
date | Thu, 08 Apr 2010 10:55:40 +0200 |
parents | 9e321dcfa5b7 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 2005-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_macro.cpp.incl" | |
27 | |
28 | |
29 // | |
30 // Replace any references to "oldref" in inputs to "use" with "newref". | |
31 // Returns the number of replacements made. | |
32 // | |
33 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) { | |
34 int nreplacements = 0; | |
35 uint req = use->req(); | |
36 for (uint j = 0; j < use->len(); j++) { | |
37 Node *uin = use->in(j); | |
38 if (uin == oldref) { | |
39 if (j < req) | |
40 use->set_req(j, newref); | |
41 else | |
42 use->set_prec(j, newref); | |
43 nreplacements++; | |
44 } else if (j >= req && uin == NULL) { | |
45 break; | |
46 } | |
47 } | |
48 return nreplacements; | |
49 } | |
50 | |
51 void PhaseMacroExpand::copy_call_debug_info(CallNode *oldcall, CallNode * newcall) { | |
52 // Copy debug information and adjust JVMState information | |
53 uint old_dbg_start = oldcall->tf()->domain()->cnt(); | |
54 uint new_dbg_start = newcall->tf()->domain()->cnt(); | |
55 int jvms_adj = new_dbg_start - old_dbg_start; | |
56 assert (new_dbg_start == newcall->req(), "argument count mismatch"); | |
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57 |
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58 Dict* sosn_map = new Dict(cmpkey,hashkey); |
0 | 59 for (uint i = old_dbg_start; i < oldcall->req(); i++) { |
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60 Node* old_in = oldcall->in(i); |
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61 // Clone old SafePointScalarObjectNodes, adjusting their field contents. |
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62 if (old_in != NULL && old_in->is_SafePointScalarObject()) { |
63
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63 SafePointScalarObjectNode* old_sosn = old_in->as_SafePointScalarObject(); |
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64 uint old_unique = C->unique(); |
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65 Node* new_in = old_sosn->clone(jvms_adj, sosn_map); |
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66 if (old_unique != C->unique()) { |
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67 new_in->set_req(0, newcall->in(0)); // reset control edge |
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68 new_in = transform_later(new_in); // Register new node. |
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69 } |
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70 old_in = new_in; |
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71 } |
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72 newcall->add_req(old_in); |
0 | 73 } |
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74 |
0 | 75 newcall->set_jvms(oldcall->jvms()); |
76 for (JVMState *jvms = newcall->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
77 jvms->set_map(newcall); | |
78 jvms->set_locoff(jvms->locoff()+jvms_adj); | |
79 jvms->set_stkoff(jvms->stkoff()+jvms_adj); | |
80 jvms->set_monoff(jvms->monoff()+jvms_adj); | |
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81 jvms->set_scloff(jvms->scloff()+jvms_adj); |
0 | 82 jvms->set_endoff(jvms->endoff()+jvms_adj); |
83 } | |
84 } | |
85 | |
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86 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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87 Node* cmp; |
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88 if (mask != 0) { |
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89 Node* and_node = transform_later(new (C, 3) AndXNode(word, MakeConX(mask))); |
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90 cmp = transform_later(new (C, 3) CmpXNode(and_node, MakeConX(bits))); |
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91 } else { |
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92 cmp = word; |
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93 } |
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94 Node* bol = transform_later(new (C, 2) BoolNode(cmp, BoolTest::ne)); |
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95 IfNode* iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN ); |
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96 transform_later(iff); |
0 | 97 |
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98 // Fast path taken. |
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99 Node *fast_taken = transform_later( new (C, 1) IfFalseNode(iff) ); |
0 | 100 |
101 // Fast path not-taken, i.e. slow path | |
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102 Node *slow_taken = transform_later( new (C, 1) IfTrueNode(iff) ); |
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103 |
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104 if (return_fast_path) { |
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105 region->init_req(edge, slow_taken); // Capture slow-control |
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106 return fast_taken; |
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107 } else { |
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108 region->init_req(edge, fast_taken); // Capture fast-control |
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109 return slow_taken; |
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110 } |
0 | 111 } |
112 | |
113 //--------------------copy_predefined_input_for_runtime_call-------------------- | |
114 void PhaseMacroExpand::copy_predefined_input_for_runtime_call(Node * ctrl, CallNode* oldcall, CallNode* call) { | |
115 // Set fixed predefined input arguments | |
116 call->init_req( TypeFunc::Control, ctrl ); | |
117 call->init_req( TypeFunc::I_O , oldcall->in( TypeFunc::I_O) ); | |
118 call->init_req( TypeFunc::Memory , oldcall->in( TypeFunc::Memory ) ); // ????? | |
119 call->init_req( TypeFunc::ReturnAdr, oldcall->in( TypeFunc::ReturnAdr ) ); | |
120 call->init_req( TypeFunc::FramePtr, oldcall->in( TypeFunc::FramePtr ) ); | |
121 } | |
122 | |
123 //------------------------------make_slow_call--------------------------------- | |
124 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) { | |
125 | |
126 // Slow-path call | |
127 int size = slow_call_type->domain()->cnt(); | |
128 CallNode *call = leaf_name | |
129 ? (CallNode*)new (C, size) CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM ) | |
130 : (CallNode*)new (C, size) CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), oldcall->jvms()->bci(), TypeRawPtr::BOTTOM ); | |
131 | |
132 // Slow path call has no side-effects, uses few values | |
133 copy_predefined_input_for_runtime_call(slow_path, oldcall, call ); | |
134 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0); | |
135 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1); | |
136 copy_call_debug_info(oldcall, call); | |
137 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
138 _igvn.hash_delete(oldcall); | |
139 _igvn.subsume_node(oldcall, call); | |
140 transform_later(call); | |
141 | |
142 return call; | |
143 } | |
144 | |
145 void PhaseMacroExpand::extract_call_projections(CallNode *call) { | |
146 _fallthroughproj = NULL; | |
147 _fallthroughcatchproj = NULL; | |
148 _ioproj_fallthrough = NULL; | |
149 _ioproj_catchall = NULL; | |
150 _catchallcatchproj = NULL; | |
151 _memproj_fallthrough = NULL; | |
152 _memproj_catchall = NULL; | |
153 _resproj = NULL; | |
154 for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) { | |
155 ProjNode *pn = call->fast_out(i)->as_Proj(); | |
156 switch (pn->_con) { | |
157 case TypeFunc::Control: | |
158 { | |
159 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj | |
160 _fallthroughproj = pn; | |
161 DUIterator_Fast jmax, j = pn->fast_outs(jmax); | |
162 const Node *cn = pn->fast_out(j); | |
163 if (cn->is_Catch()) { | |
164 ProjNode *cpn = NULL; | |
165 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) { | |
166 cpn = cn->fast_out(k)->as_Proj(); | |
167 assert(cpn->is_CatchProj(), "must be a CatchProjNode"); | |
168 if (cpn->_con == CatchProjNode::fall_through_index) | |
169 _fallthroughcatchproj = cpn; | |
170 else { | |
171 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index."); | |
172 _catchallcatchproj = cpn; | |
173 } | |
174 } | |
175 } | |
176 break; | |
177 } | |
178 case TypeFunc::I_O: | |
179 if (pn->_is_io_use) | |
180 _ioproj_catchall = pn; | |
181 else | |
182 _ioproj_fallthrough = pn; | |
183 break; | |
184 case TypeFunc::Memory: | |
185 if (pn->_is_io_use) | |
186 _memproj_catchall = pn; | |
187 else | |
188 _memproj_fallthrough = pn; | |
189 break; | |
190 case TypeFunc::Parms: | |
191 _resproj = pn; | |
192 break; | |
193 default: | |
194 assert(false, "unexpected projection from allocation node."); | |
195 } | |
196 } | |
197 | |
198 } | |
199 | |
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200 // Eliminate a card mark sequence. p2x is a ConvP2XNode |
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201 void PhaseMacroExpand::eliminate_card_mark(Node* p2x) { |
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202 assert(p2x->Opcode() == Op_CastP2X, "ConvP2XNode required"); |
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203 if (!UseG1GC) { |
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204 // vanilla/CMS post barrier |
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205 Node *shift = p2x->unique_out(); |
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206 Node *addp = shift->unique_out(); |
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207 for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) { |
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208 Node *st = addp->last_out(j); |
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209 assert(st->is_Store(), "store required"); |
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210 _igvn.replace_node(st, st->in(MemNode::Memory)); |
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211 } |
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212 } else { |
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213 // G1 pre/post barriers |
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214 assert(p2x->outcnt() == 2, "expects 2 users: Xor and URShift nodes"); |
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215 // It could be only one user, URShift node, in Object.clone() instrinsic |
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216 // but the new allocation is passed to arraycopy stub and it could not |
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217 // be scalar replaced. So we don't check the case. |
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218 |
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219 // Remove G1 post barrier. |
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220 |
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221 // Search for CastP2X->Xor->URShift->Cmp path which |
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222 // checks if the store done to a different from the value's region. |
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223 // And replace Cmp with #0 (false) to collapse G1 post barrier. |
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224 Node* xorx = NULL; |
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225 for (DUIterator_Fast imax, i = p2x->fast_outs(imax); i < imax; i++) { |
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226 Node* u = p2x->fast_out(i); |
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227 if (u->Opcode() == Op_XorX) { |
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228 xorx = u; |
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229 break; |
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230 } |
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231 } |
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232 assert(xorx != NULL, "missing G1 post barrier"); |
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233 Node* shift = xorx->unique_out(); |
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234 Node* cmpx = shift->unique_out(); |
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235 assert(cmpx->is_Cmp() && cmpx->unique_out()->is_Bool() && |
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236 cmpx->unique_out()->as_Bool()->_test._test == BoolTest::ne, |
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237 "missing region check in G1 post barrier"); |
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238 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ)); |
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239 |
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240 // Remove G1 pre barrier. |
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241 |
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242 // Search "if (marking != 0)" check and set it to "false". |
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243 Node* this_region = p2x->in(0); |
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244 assert(this_region != NULL, ""); |
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245 // There is no G1 pre barrier if previous stored value is NULL |
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246 // (for example, after initialization). |
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247 if (this_region->is_Region() && this_region->req() == 3) { |
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248 int ind = 1; |
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249 if (!this_region->in(ind)->is_IfFalse()) { |
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250 ind = 2; |
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251 } |
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252 if (this_region->in(ind)->is_IfFalse()) { |
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253 Node* bol = this_region->in(ind)->in(0)->in(1); |
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254 assert(bol->is_Bool(), ""); |
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255 cmpx = bol->in(1); |
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256 if (bol->as_Bool()->_test._test == BoolTest::ne && |
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257 cmpx->is_Cmp() && cmpx->in(2) == intcon(0) && |
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258 cmpx->in(1)->is_Load()) { |
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259 Node* adr = cmpx->in(1)->as_Load()->in(MemNode::Address); |
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260 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + |
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261 PtrQueue::byte_offset_of_active()); |
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262 if (adr->is_AddP() && adr->in(AddPNode::Base) == top() && |
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263 adr->in(AddPNode::Address)->Opcode() == Op_ThreadLocal && |
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264 adr->in(AddPNode::Offset) == MakeConX(marking_offset)) { |
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265 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ)); |
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266 } |
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267 } |
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268 } |
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269 } |
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270 // Now CastP2X can be removed since it is used only on dead path |
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271 // which currently still alive until igvn optimize it. |
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272 assert(p2x->unique_out()->Opcode() == Op_URShiftX, ""); |
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273 _igvn.replace_node(p2x, top()); |
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274 } |
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275 } |
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276 |
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277 // Search for a memory operation for the specified memory slice. |
253
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278 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) { |
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279 Node *orig_mem = mem; |
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280 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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281 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr(); |
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282 while (true) { |
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283 if (mem == alloc_mem || mem == start_mem ) { |
605 | 284 return mem; // hit one of our sentinels |
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285 } else if (mem->is_MergeMem()) { |
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286 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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287 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) { |
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288 Node *in = mem->in(0); |
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289 // we can safely skip over safepoints, calls, locks and membars because we |
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290 // already know that the object is safe to eliminate. |
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291 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) { |
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292 return in; |
253
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293 } else if (in->is_Call()) { |
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294 CallNode *call = in->as_Call(); |
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295 if (!call->may_modify(tinst, phase)) { |
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296 mem = call->in(TypeFunc::Memory); |
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297 } |
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298 mem = in->in(TypeFunc::Memory); |
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299 } else if (in->is_MemBar()) { |
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300 mem = in->in(TypeFunc::Memory); |
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301 } else { |
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302 assert(false, "unexpected projection"); |
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303 } |
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304 } else if (mem->is_Store()) { |
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305 const TypePtr* atype = mem->as_Store()->adr_type(); |
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306 int adr_idx = Compile::current()->get_alias_index(atype); |
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307 if (adr_idx == alias_idx) { |
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308 assert(atype->isa_oopptr(), "address type must be oopptr"); |
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309 int adr_offset = atype->offset(); |
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310 uint adr_iid = atype->is_oopptr()->instance_id(); |
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311 // Array elements references have the same alias_idx |
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312 // but different offset and different instance_id. |
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313 if (adr_offset == offset && adr_iid == alloc->_idx) |
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314 return mem; |
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315 } else { |
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316 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw"); |
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317 } |
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318 mem = mem->in(MemNode::Memory); |
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319 } else if (mem->is_ClearArray()) { |
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320 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) { |
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321 // Can not bypass initialization of the instance |
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322 // we are looking. |
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323 debug_only(intptr_t offset;) |
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324 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity"); |
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325 InitializeNode* init = alloc->as_Allocate()->initialization(); |
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326 // We are looking for stored value, return Initialize node |
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327 // or memory edge from Allocate node. |
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328 if (init != NULL) |
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329 return init; |
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330 else |
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331 return alloc->in(TypeFunc::Memory); // It will produce zero value (see callers). |
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332 } |
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333 // Otherwise skip it (the call updated 'mem' value). |
584 | 334 } else if (mem->Opcode() == Op_SCMemProj) { |
335 assert(mem->in(0)->is_LoadStore(), "sanity"); | |
336 const TypePtr* atype = mem->in(0)->in(MemNode::Address)->bottom_type()->is_ptr(); | |
337 int adr_idx = Compile::current()->get_alias_index(atype); | |
338 if (adr_idx == alias_idx) { | |
339 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); | |
340 return NULL; | |
341 } | |
342 mem = mem->in(0)->in(MemNode::Memory); | |
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343 } else { |
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344 return mem; |
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345 } |
247 | 346 assert(mem != orig_mem, "dead memory loop"); |
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347 } |
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348 } |
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349 |
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350 // |
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351 // Given a Memory Phi, compute a value Phi containing the values from stores |
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352 // on the input paths. |
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353 // Note: this function is recursive, its depth is limied by the "level" argument |
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354 // Returns the computed Phi, or NULL if it cannot compute it. |
247 | 355 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) { |
356 assert(mem->is_Phi(), "sanity"); | |
357 int alias_idx = C->get_alias_index(adr_t); | |
358 int offset = adr_t->offset(); | |
359 int instance_id = adr_t->instance_id(); | |
360 | |
361 // Check if an appropriate value phi already exists. | |
362 Node* region = mem->in(0); | |
363 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) { | |
364 Node* phi = region->fast_out(k); | |
365 if (phi->is_Phi() && phi != mem && | |
366 phi->as_Phi()->is_same_inst_field(phi_type, instance_id, alias_idx, offset)) { | |
367 return phi; | |
368 } | |
369 } | |
370 // Check if an appropriate new value phi already exists. | |
371 Node* new_phi = NULL; | |
372 uint size = value_phis->size(); | |
373 for (uint i=0; i < size; i++) { | |
374 if ( mem->_idx == value_phis->index_at(i) ) { | |
375 return value_phis->node_at(i); | |
376 } | |
377 } | |
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378 |
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379 if (level <= 0) { |
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380 return NULL; // Give up: phi tree too deep |
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381 } |
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382 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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383 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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384 |
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385 uint length = mem->req(); |
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386 GrowableArray <Node *> values(length, length, NULL); |
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387 |
247 | 388 // create a new Phi for the value |
389 PhiNode *phi = new (C, length) PhiNode(mem->in(0), phi_type, NULL, instance_id, alias_idx, offset); | |
390 transform_later(phi); | |
391 value_phis->push(phi, mem->_idx); | |
392 | |
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393 for (uint j = 1; j < length; j++) { |
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394 Node *in = mem->in(j); |
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395 if (in == NULL || in->is_top()) { |
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396 values.at_put(j, in); |
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397 } else { |
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398 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn); |
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399 if (val == start_mem || val == alloc_mem) { |
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400 // hit a sentinel, return appropriate 0 value |
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401 values.at_put(j, _igvn.zerocon(ft)); |
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402 continue; |
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403 } |
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404 if (val->is_Initialize()) { |
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405 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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406 } |
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407 if (val == NULL) { |
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408 return NULL; // can't find a value on this path |
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409 } |
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410 if (val == mem) { |
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411 values.at_put(j, mem); |
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412 } else if (val->is_Store()) { |
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413 values.at_put(j, val->in(MemNode::ValueIn)); |
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414 } else if(val->is_Proj() && val->in(0) == alloc) { |
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415 values.at_put(j, _igvn.zerocon(ft)); |
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416 } else if (val->is_Phi()) { |
247 | 417 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1); |
418 if (val == NULL) { | |
419 return NULL; | |
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420 } |
247 | 421 values.at_put(j, val); |
584 | 422 } else if (val->Opcode() == Op_SCMemProj) { |
423 assert(val->in(0)->is_LoadStore(), "sanity"); | |
424 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); | |
425 return NULL; | |
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426 } else { |
584 | 427 #ifdef ASSERT |
428 val->dump(); | |
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429 assert(false, "unknown node on this path"); |
584 | 430 #endif |
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431 return NULL; // unknown node on this path |
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432 } |
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433 } |
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434 } |
247 | 435 // Set Phi's inputs |
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436 for (uint j = 1; j < length; j++) { |
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437 if (values.at(j) == mem) { |
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438 phi->init_req(j, phi); |
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439 } else { |
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440 phi->init_req(j, values.at(j)); |
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441 } |
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442 } |
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443 return phi; |
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444 } |
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445 |
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446 // Search the last value stored into the object's field. |
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447 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc) { |
223 | 448 assert(adr_t->is_known_instance_field(), "instance required"); |
449 int instance_id = adr_t->instance_id(); | |
450 assert((uint)instance_id == alloc->_idx, "wrong allocation"); | |
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451 |
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452 int alias_idx = C->get_alias_index(adr_t); |
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453 int offset = adr_t->offset(); |
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454 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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455 Node *alloc_ctrl = alloc->in(TypeFunc::Control); |
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456 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
247 | 457 Arena *a = Thread::current()->resource_area(); |
458 VectorSet visited(a); | |
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459 |
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460 |
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461 bool done = sfpt_mem == alloc_mem; |
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462 Node *mem = sfpt_mem; |
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463 while (!done) { |
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464 if (visited.test_set(mem->_idx)) { |
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465 return NULL; // found a loop, give up |
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466 } |
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467 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn); |
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468 if (mem == start_mem || mem == alloc_mem) { |
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469 done = true; // hit a sentinel, return appropriate 0 value |
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470 } else if (mem->is_Initialize()) { |
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471 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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472 if (mem == NULL) { |
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473 done = true; // Something go wrong. |
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474 } else if (mem->is_Store()) { |
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475 const TypePtr* atype = mem->as_Store()->adr_type(); |
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476 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice"); |
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477 done = true; |
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478 } |
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479 } else if (mem->is_Store()) { |
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480 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr(); |
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481 assert(atype != NULL, "address type must be oopptr"); |
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482 assert(C->get_alias_index(atype) == alias_idx && |
223 | 483 atype->is_known_instance_field() && atype->offset() == offset && |
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484 atype->instance_id() == instance_id, "store is correct memory slice"); |
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485 done = true; |
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486 } else if (mem->is_Phi()) { |
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487 // try to find a phi's unique input |
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488 Node *unique_input = NULL; |
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489 Node *top = C->top(); |
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490 for (uint i = 1; i < mem->req(); i++) { |
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491 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn); |
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492 if (n == NULL || n == top || n == mem) { |
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493 continue; |
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494 } else if (unique_input == NULL) { |
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495 unique_input = n; |
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496 } else if (unique_input != n) { |
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497 unique_input = top; |
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498 break; |
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499 } |
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500 } |
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501 if (unique_input != NULL && unique_input != top) { |
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502 mem = unique_input; |
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503 } else { |
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504 done = true; |
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505 } |
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506 } else { |
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507 assert(false, "unexpected node"); |
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508 } |
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509 } |
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510 if (mem != NULL) { |
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511 if (mem == start_mem || mem == alloc_mem) { |
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512 // hit a sentinel, return appropriate 0 value |
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513 return _igvn.zerocon(ft); |
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514 } else if (mem->is_Store()) { |
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515 return mem->in(MemNode::ValueIn); |
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516 } else if (mem->is_Phi()) { |
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517 // attempt to produce a Phi reflecting the values on the input paths of the Phi |
247 | 518 Node_Stack value_phis(a, 8); |
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519 Node * phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit); |
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520 if (phi != NULL) { |
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521 return phi; |
247 | 522 } else { |
523 // Kill all new Phis | |
524 while(value_phis.is_nonempty()) { | |
525 Node* n = value_phis.node(); | |
526 _igvn.hash_delete(n); | |
527 _igvn.subsume_node(n, C->top()); | |
528 value_phis.pop(); | |
529 } | |
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530 } |
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531 } |
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532 } |
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533 // Something go wrong. |
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534 return NULL; |
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535 } |
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536 |
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537 // Check the possibility of scalar replacement. |
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538 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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539 // Scan the uses of the allocation to check for anything that would |
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540 // prevent us from eliminating it. |
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541 NOT_PRODUCT( const char* fail_eliminate = NULL; ) |
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542 DEBUG_ONLY( Node* disq_node = NULL; ) |
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543 bool can_eliminate = true; |
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544 |
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545 Node* res = alloc->result_cast(); |
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546 const TypeOopPtr* res_type = NULL; |
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547 if (res == NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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548 // All users were eliminated. |
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parents:
66
diff
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549 } else if (!res->is_CheckCastPP()) { |
a8880a78d355
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parents:
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|
550 alloc->_is_scalar_replaceable = false; // don't try again |
a8880a78d355
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551 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";) |
a8880a78d355
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552 can_eliminate = false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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|
553 } else { |
a8880a78d355
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|
554 res_type = _igvn.type(res)->isa_oopptr(); |
a8880a78d355
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diff
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555 if (res_type == NULL) { |
a8880a78d355
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diff
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556 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";) |
a8880a78d355
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557 can_eliminate = false; |
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diff
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|
558 } else if (res_type->isa_aryptr()) { |
a8880a78d355
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559 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
a8880a78d355
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560 if (length < 0) { |
a8880a78d355
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561 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";) |
a8880a78d355
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562 can_eliminate = false; |
a8880a78d355
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parents:
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|
563 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
564 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
565 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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parents:
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diff
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|
566 |
a8880a78d355
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diff
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|
567 if (can_eliminate && res != NULL) { |
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568 for (DUIterator_Fast jmax, j = res->fast_outs(jmax); |
a8880a78d355
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569 j < jmax && can_eliminate; j++) { |
a8880a78d355
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570 Node* use = res->fast_out(j); |
a8880a78d355
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|
571 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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diff
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572 if (use->is_AddP()) { |
a8880a78d355
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573 const TypePtr* addp_type = _igvn.type(use)->is_ptr(); |
a8880a78d355
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574 int offset = addp_type->offset(); |
a8880a78d355
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|
575 |
a8880a78d355
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576 if (offset == Type::OffsetTop || offset == Type::OffsetBot) { |
a8880a78d355
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577 NOT_PRODUCT(fail_eliminate = "Undefined field referrence";) |
a8880a78d355
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578 can_eliminate = false; |
a8880a78d355
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diff
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|
579 break; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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diff
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|
580 } |
a8880a78d355
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|
581 for (DUIterator_Fast kmax, k = use->fast_outs(kmax); |
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582 k < kmax && can_eliminate; k++) { |
a8880a78d355
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|
583 Node* n = use->fast_out(k); |
a8880a78d355
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|
584 if (!n->is_Store() && n->Opcode() != Op_CastP2X) { |
a8880a78d355
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585 DEBUG_ONLY(disq_node = n;) |
253
b0fe4deeb9fb
6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
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diff
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586 if (n->is_Load() || n->is_LoadStore()) { |
73
a8880a78d355
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|
587 NOT_PRODUCT(fail_eliminate = "Field load";) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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diff
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|
588 } else { |
a8880a78d355
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parents:
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diff
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|
589 NOT_PRODUCT(fail_eliminate = "Not store field referrence";) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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parents:
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diff
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|
590 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
591 can_eliminate = false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
592 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
593 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
594 } else if (use->is_SafePoint()) { |
a8880a78d355
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kvn
parents:
66
diff
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|
595 SafePointNode* sfpt = use->as_SafePoint(); |
168
7793bd37a336
6705887: Compressed Oops: generate x64 addressing and implicit null checks with narrow oops
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parents:
163
diff
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596 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) { |
73
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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parents:
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diff
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|
597 // Object is passed as argument. |
a8880a78d355
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66
diff
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|
598 DEBUG_ONLY(disq_node = use;) |
a8880a78d355
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kvn
parents:
66
diff
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|
599 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";) |
a8880a78d355
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kvn
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diff
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|
600 can_eliminate = false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
601 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
602 Node* sfptMem = sfpt->memory(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
603 if (sfptMem == NULL || sfptMem->is_top()) { |
a8880a78d355
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kvn
parents:
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diff
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|
604 DEBUG_ONLY(disq_node = use;) |
a8880a78d355
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parents:
66
diff
changeset
|
605 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";) |
a8880a78d355
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diff
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|
606 can_eliminate = false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
607 } else { |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
608 safepoints.append_if_missing(sfpt); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
609 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
610 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
611 if (use->is_Phi()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
612 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) { |
a8880a78d355
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diff
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|
613 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
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|
614 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
615 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
changeset
|
616 } |
a8880a78d355
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kvn
parents:
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|
617 DEBUG_ONLY(disq_node = use;) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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|
618 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
619 if (use->Opcode() == Op_Return) { |
a8880a78d355
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620 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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|
621 }else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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|
622 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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parents:
66
diff
changeset
|
623 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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diff
changeset
|
624 DEBUG_ONLY(disq_node = use;) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
625 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
626 can_eliminate = false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
627 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
628 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
629 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
630 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
631 #ifndef PRODUCT |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
632 if (PrintEliminateAllocations) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
633 if (can_eliminate) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
634 tty->print("Scalar "); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
635 if (res == NULL) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
636 alloc->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
637 else |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
638 res->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
639 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
640 tty->print("NotScalar (%s)", fail_eliminate); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
641 if (res == NULL) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
642 alloc->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
643 else |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
644 res->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
645 #ifdef ASSERT |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
646 if (disq_node != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
647 tty->print(" >>>> "); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
648 disq_node->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
649 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
650 #endif /*ASSERT*/ |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
651 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
652 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
653 #endif |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
654 return can_eliminate; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
655 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
656 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
657 // Do scalar replacement. |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
658 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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|
659 GrowableArray <SafePointNode *> safepoints_done; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
660 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
661 ciKlass* klass = NULL; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
662 ciInstanceKlass* iklass = NULL; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
663 int nfields = 0; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
664 int array_base; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
665 int element_size; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
666 BasicType basic_elem_type; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
667 ciType* elem_type; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
668 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
669 Node* res = alloc->result_cast(); |
a8880a78d355
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kvn
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diff
changeset
|
670 const TypeOopPtr* res_type = NULL; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
671 if (res != NULL) { // Could be NULL when there are no users |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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|
672 res_type = _igvn.type(res)->isa_oopptr(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
673 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
674 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
675 if (res != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
676 klass = res_type->klass(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
677 if (res_type->isa_instptr()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
678 // find the fields of the class which will be needed for safepoint debug information |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
679 assert(klass->is_instance_klass(), "must be an instance klass."); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
680 iklass = klass->as_instance_klass(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
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681 nfields = iklass->nof_nonstatic_fields(); |
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682 } else { |
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683 // find the array's elements which will be needed for safepoint debug information |
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684 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
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685 assert(klass->is_array_klass() && nfields >= 0, "must be an array klass."); |
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686 elem_type = klass->as_array_klass()->element_type(); |
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687 basic_elem_type = elem_type->basic_type(); |
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688 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type); |
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689 element_size = type2aelembytes(basic_elem_type); |
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690 } |
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691 } |
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692 // |
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693 // Process the safepoint uses |
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694 // |
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695 while (safepoints.length() > 0) { |
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696 SafePointNode* sfpt = safepoints.pop(); |
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697 Node* mem = sfpt->memory(); |
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698 uint first_ind = sfpt->req(); |
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699 SafePointScalarObjectNode* sobj = new (C, 1) SafePointScalarObjectNode(res_type, |
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700 #ifdef ASSERT |
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701 alloc, |
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702 #endif |
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703 first_ind, nfields); |
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704 sobj->init_req(0, sfpt->in(TypeFunc::Control)); |
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705 transform_later(sobj); |
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706 |
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707 // Scan object's fields adding an input to the safepoint for each field. |
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708 for (int j = 0; j < nfields; j++) { |
306
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709 intptr_t offset; |
73
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710 ciField* field = NULL; |
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711 if (iklass != NULL) { |
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712 field = iklass->nonstatic_field_at(j); |
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713 offset = field->offset(); |
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714 elem_type = field->type(); |
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715 basic_elem_type = field->layout_type(); |
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716 } else { |
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717 offset = array_base + j * (intptr_t)element_size; |
73
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718 } |
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719 |
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720 const Type *field_type; |
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721 // The next code is taken from Parse::do_get_xxx(). |
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722 if (basic_elem_type == T_OBJECT || basic_elem_type == T_ARRAY) { |
73
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723 if (!elem_type->is_loaded()) { |
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724 field_type = TypeInstPtr::BOTTOM; |
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725 } else if (field != NULL && field->is_constant()) { |
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726 // This can happen if the constant oop is non-perm. |
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727 ciObject* con = field->constant_value().as_object(); |
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728 // Do not "join" in the previous type; it doesn't add value, |
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729 // and may yield a vacuous result if the field is of interface type. |
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730 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); |
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731 assert(field_type != NULL, "field singleton type must be consistent"); |
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732 } else { |
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733 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass()); |
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734 } |
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735 if (UseCompressedOops) { |
221
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736 field_type = field_type->make_narrowoop(); |
124
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737 basic_elem_type = T_NARROWOOP; |
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738 } |
73
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739 } else { |
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740 field_type = Type::get_const_basic_type(basic_elem_type); |
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741 } |
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742 |
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743 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr(); |
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744 |
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745 Node *field_val = value_from_mem(mem, basic_elem_type, field_type, field_addr_type, alloc); |
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746 if (field_val == NULL) { |
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747 // we weren't able to find a value for this field, |
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748 // give up on eliminating this allocation |
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749 alloc->_is_scalar_replaceable = false; // don't try again |
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750 // remove any extra entries we added to the safepoint |
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751 uint last = sfpt->req() - 1; |
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752 for (int k = 0; k < j; k++) { |
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753 sfpt->del_req(last--); |
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|
754 } |
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|
755 // rollback processed safepoints |
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756 while (safepoints_done.length() > 0) { |
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757 SafePointNode* sfpt_done = safepoints_done.pop(); |
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|
758 // remove any extra entries we added to the safepoint |
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|
759 last = sfpt_done->req() - 1; |
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|
760 for (int k = 0; k < nfields; k++) { |
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|
761 sfpt_done->del_req(last--); |
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|
762 } |
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|
763 JVMState *jvms = sfpt_done->jvms(); |
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764 jvms->set_endoff(sfpt_done->req()); |
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|
765 // Now make a pass over the debug information replacing any references |
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diff
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|
766 // to SafePointScalarObjectNode with the allocated object. |
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|
767 int start = jvms->debug_start(); |
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|
768 int end = jvms->debug_end(); |
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|
769 for (int i = start; i < end; i++) { |
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770 if (sfpt_done->in(i)->is_SafePointScalarObject()) { |
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771 SafePointScalarObjectNode* scobj = sfpt_done->in(i)->as_SafePointScalarObject(); |
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772 if (scobj->first_index() == sfpt_done->req() && |
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773 scobj->n_fields() == (uint)nfields) { |
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|
774 assert(scobj->alloc() == alloc, "sanity"); |
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|
775 sfpt_done->set_req(i, res); |
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|
776 } |
a8880a78d355
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changeset
|
777 } |
a8880a78d355
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diff
changeset
|
778 } |
a8880a78d355
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diff
changeset
|
779 } |
a8880a78d355
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|
780 #ifndef PRODUCT |
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|
781 if (PrintEliminateAllocations) { |
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|
782 if (field != NULL) { |
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|
783 tty->print("=== At SafePoint node %d can't find value of Field: ", |
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|
784 sfpt->_idx); |
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|
785 field->print(); |
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|
786 int field_idx = C->get_alias_index(field_addr_type); |
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|
787 tty->print(" (alias_idx=%d)", field_idx); |
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|
788 } else { // Array's element |
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|
789 tty->print("=== At SafePoint node %d can't find value of array element [%d]", |
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|
790 sfpt->_idx, j); |
a8880a78d355
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diff
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|
791 } |
a8880a78d355
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diff
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|
792 tty->print(", which prevents elimination of: "); |
a8880a78d355
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diff
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|
793 if (res == NULL) |
a8880a78d355
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diff
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|
794 alloc->dump(); |
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diff
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|
795 else |
a8880a78d355
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|
796 res->dump(); |
a8880a78d355
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|
797 } |
a8880a78d355
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diff
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|
798 #endif |
a8880a78d355
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diff
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|
799 return false; |
a8880a78d355
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|
800 } |
124
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|
801 if (UseCompressedOops && field_type->isa_narrowoop()) { |
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|
802 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation |
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803 // to be able scalar replace the allocation. |
221
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804 if (field_val->is_EncodeP()) { |
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805 field_val = field_val->in(1); |
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|
806 } else { |
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|
807 field_val = transform_later(new (C, 2) DecodeNNode(field_val, field_val->bottom_type()->make_ptr())); |
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808 } |
124
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|
809 } |
73
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|
810 sfpt->add_req(field_val); |
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|
811 } |
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parents:
66
diff
changeset
|
812 JVMState *jvms = sfpt->jvms(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
813 jvms->set_endoff(sfpt->req()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
814 // 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
|
815 // to the allocated object with "sobj" |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
816 int start = jvms->debug_start(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
817 int end = jvms->debug_end(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
818 for (int i = start; i < end; i++) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
819 if (sfpt->in(i) == res) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
820 sfpt->set_req(i, sobj); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
821 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
822 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
823 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
|
824 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
825 return true; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
826 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
827 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
828 // Process users of eliminated allocation. |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
829 void PhaseMacroExpand::process_users_of_allocation(AllocateNode *alloc) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
830 Node* res = alloc->result_cast(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
831 if (res != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
832 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
833 Node *use = res->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
834 uint oc1 = res->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
835 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
836 if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
837 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
838 Node *n = use->last_out(k); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
839 uint oc2 = use->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
840 if (n->is_Store()) { |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
841 #ifdef ASSERT |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
842 // 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
|
843 // 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
|
844 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
|
845 p < pmax; p++) { |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
846 Node* mb = n->fast_out(p); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
847 assert(mb->is_Initialize() || !mb->is_MemBar() || |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
848 mb->req() <= MemBarNode::Precedent || |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
849 mb->in(MemBarNode::Precedent) != n, |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
850 "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
|
851 } |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
852 #endif |
73
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
853 _igvn.replace_node(n, n->in(MemNode::Memory)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
854 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
855 eliminate_card_mark(n); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
856 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
857 k -= (oc2 - use->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
858 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
859 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
860 eliminate_card_mark(use); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
861 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
862 j -= (oc1 - res->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
863 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
864 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
|
865 _igvn.remove_dead_node(res); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
866 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
867 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
868 // |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
869 // Process other users of allocation's projections |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
870 // |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
871 if (_resproj != NULL && _resproj->outcnt() != 0) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
872 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
|
873 Node *use = _resproj->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
874 uint oc1 = _resproj->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
875 if (use->is_Initialize()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
876 // Eliminate Initialize node. |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
877 InitializeNode *init = use->as_Initialize(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
878 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
|
879 Node *ctrl_proj = init->proj_out(TypeFunc::Control); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
880 if (ctrl_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
881 assert(init->in(TypeFunc::Control) == _fallthroughcatchproj, "allocation control projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
882 _igvn.replace_node(ctrl_proj, _fallthroughcatchproj); |
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 Node *mem_proj = init->proj_out(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
885 if (mem_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
886 Node *mem = init->in(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
887 #ifdef ASSERT |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
888 if (mem->is_MergeMem()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
889 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
|
890 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
891 assert(mem == _memproj_fallthrough, "allocation memory projection"); |
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 #endif |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
894 _igvn.replace_node(mem_proj, mem); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
895 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
896 } else if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
897 // 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
|
898 _igvn.replace_node(use, C->top()); |
73
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
899 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
900 assert(false, "only Initialize or AddP expected"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
901 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
902 j -= (oc1 - _resproj->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
903 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
904 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
905 if (_fallthroughcatchproj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
906 _igvn.replace_node(_fallthroughcatchproj, alloc->in(TypeFunc::Control)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
907 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
908 if (_memproj_fallthrough != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
909 _igvn.replace_node(_memproj_fallthrough, alloc->in(TypeFunc::Memory)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
910 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
911 if (_memproj_catchall != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
912 _igvn.replace_node(_memproj_catchall, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
913 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
914 if (_ioproj_fallthrough != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
915 _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
|
916 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
917 if (_ioproj_catchall != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
918 _igvn.replace_node(_ioproj_catchall, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
919 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
920 if (_catchallcatchproj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
921 _igvn.replace_node(_catchallcatchproj, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
922 } |
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 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
925 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) { |
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 (!EliminateAllocations || !alloc->_is_scalar_replaceable) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
928 return false; |
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 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
931 extract_call_projections(alloc); |
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 GrowableArray <SafePointNode *> safepoints; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
934 if (!can_eliminate_allocation(alloc, safepoints)) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
935 return false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
936 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
937 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
938 if (!scalar_replacement(alloc, safepoints)) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
939 return false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
940 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
941 |
1080
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
942 CompileLog* log = C->log(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
943 if (log != NULL) { |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
944 Node* klass = alloc->in(AllocateNode::KlassNode); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
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945 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr(); |
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946 log->head("eliminate_allocation type='%d'", |
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947 log->identify(tklass->klass())); |
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948 JVMState* p = alloc->jvms(); |
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949 while (p != NULL) { |
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950 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); |
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951 p = p->caller(); |
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952 } |
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953 log->tail("eliminate_allocation"); |
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954 } |
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955 |
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956 process_users_of_allocation(alloc); |
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957 |
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958 #ifndef PRODUCT |
1080
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959 if (PrintEliminateAllocations) { |
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960 if (alloc->is_AllocateArray()) |
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961 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx); |
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962 else |
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963 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx); |
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964 } |
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965 #endif |
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966 |
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967 return true; |
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968 } |
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969 |
0 | 970 |
971 //---------------------------set_eden_pointers------------------------- | |
972 void PhaseMacroExpand::set_eden_pointers(Node* &eden_top_adr, Node* &eden_end_adr) { | |
973 if (UseTLAB) { // Private allocation: load from TLS | |
974 Node* thread = transform_later(new (C, 1) ThreadLocalNode()); | |
975 int tlab_top_offset = in_bytes(JavaThread::tlab_top_offset()); | |
976 int tlab_end_offset = in_bytes(JavaThread::tlab_end_offset()); | |
977 eden_top_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_top_offset); | |
978 eden_end_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_end_offset); | |
979 } else { // Shared allocation: load from globals | |
980 CollectedHeap* ch = Universe::heap(); | |
981 address top_adr = (address)ch->top_addr(); | |
982 address end_adr = (address)ch->end_addr(); | |
983 eden_top_adr = makecon(TypeRawPtr::make(top_adr)); | |
984 eden_end_adr = basic_plus_adr(eden_top_adr, end_adr - top_adr); | |
985 } | |
986 } | |
987 | |
988 | |
989 Node* PhaseMacroExpand::make_load(Node* ctl, Node* mem, Node* base, int offset, const Type* value_type, BasicType bt) { | |
990 Node* adr = basic_plus_adr(base, offset); | |
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991 const TypePtr* adr_type = adr->bottom_type()->is_ptr(); |
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992 Node* value = LoadNode::make(_igvn, ctl, mem, adr, adr_type, value_type, bt); |
0 | 993 transform_later(value); |
994 return value; | |
995 } | |
996 | |
997 | |
998 Node* PhaseMacroExpand::make_store(Node* ctl, Node* mem, Node* base, int offset, Node* value, BasicType bt) { | |
999 Node* adr = basic_plus_adr(base, offset); | |
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1000 mem = StoreNode::make(_igvn, ctl, mem, adr, NULL, value, bt); |
0 | 1001 transform_later(mem); |
1002 return mem; | |
1003 } | |
1004 | |
1005 //============================================================================= | |
1006 // | |
1007 // A L L O C A T I O N | |
1008 // | |
1009 // Allocation attempts to be fast in the case of frequent small objects. | |
1010 // It breaks down like this: | |
1011 // | |
1012 // 1) Size in doublewords is computed. This is a constant for objects and | |
1013 // variable for most arrays. Doubleword units are used to avoid size | |
1014 // overflow of huge doubleword arrays. We need doublewords in the end for | |
1015 // rounding. | |
1016 // | |
1017 // 2) Size is checked for being 'too large'. Too-large allocations will go | |
1018 // the slow path into the VM. The slow path can throw any required | |
1019 // exceptions, and does all the special checks for very large arrays. The | |
1020 // size test can constant-fold away for objects. For objects with | |
1021 // finalizers it constant-folds the otherway: you always go slow with | |
1022 // finalizers. | |
1023 // | |
1024 // 3) If NOT using TLABs, this is the contended loop-back point. | |
1025 // Load-Locked the heap top. If using TLABs normal-load the heap top. | |
1026 // | |
1027 // 4) Check that heap top + size*8 < max. If we fail go the slow ` route. | |
1028 // NOTE: "top+size*8" cannot wrap the 4Gig line! Here's why: for largish | |
1029 // "size*8" we always enter the VM, where "largish" is a constant picked small | |
1030 // enough that there's always space between the eden max and 4Gig (old space is | |
1031 // there so it's quite large) and large enough that the cost of entering the VM | |
1032 // is dwarfed by the cost to initialize the space. | |
1033 // | |
1034 // 5) If NOT using TLABs, Store-Conditional the adjusted heap top back | |
1035 // down. If contended, repeat at step 3. If using TLABs normal-store | |
1036 // adjusted heap top back down; there is no contention. | |
1037 // | |
1038 // 6) If !ZeroTLAB then Bulk-clear the object/array. Fill in klass & mark | |
1039 // fields. | |
1040 // | |
1041 // 7) Merge with the slow-path; cast the raw memory pointer to the correct | |
1042 // oop flavor. | |
1043 // | |
1044 //============================================================================= | |
1045 // FastAllocateSizeLimit value is in DOUBLEWORDS. | |
1046 // Allocations bigger than this always go the slow route. | |
1047 // This value must be small enough that allocation attempts that need to | |
1048 // trigger exceptions go the slow route. Also, it must be small enough so | |
1049 // that heap_top + size_in_bytes does not wrap around the 4Gig limit. | |
1050 //=============================================================================j// | |
1051 // %%% Here is an old comment from parseHelper.cpp; is it outdated? | |
1052 // The allocator will coalesce int->oop copies away. See comment in | |
1053 // coalesce.cpp about how this works. It depends critically on the exact | |
1054 // code shape produced here, so if you are changing this code shape | |
1055 // make sure the GC info for the heap-top is correct in and around the | |
1056 // slow-path call. | |
1057 // | |
1058 | |
1059 void PhaseMacroExpand::expand_allocate_common( | |
1060 AllocateNode* alloc, // allocation node to be expanded | |
1061 Node* length, // array length for an array allocation | |
1062 const TypeFunc* slow_call_type, // Type of slow call | |
1063 address slow_call_address // Address of slow call | |
1064 ) | |
1065 { | |
1066 | |
1067 Node* ctrl = alloc->in(TypeFunc::Control); | |
1068 Node* mem = alloc->in(TypeFunc::Memory); | |
1069 Node* i_o = alloc->in(TypeFunc::I_O); | |
1070 Node* size_in_bytes = alloc->in(AllocateNode::AllocSize); | |
1071 Node* klass_node = alloc->in(AllocateNode::KlassNode); | |
1072 Node* initial_slow_test = alloc->in(AllocateNode::InitialTest); | |
1073 | |
1074 assert(ctrl != NULL, "must have control"); | |
1075 // We need a Region and corresponding Phi's to merge the slow-path and fast-path results. | |
1076 // they will not be used if "always_slow" is set | |
1077 enum { slow_result_path = 1, fast_result_path = 2 }; | |
1078 Node *result_region; | |
1079 Node *result_phi_rawmem; | |
1080 Node *result_phi_rawoop; | |
1081 Node *result_phi_i_o; | |
1082 | |
1083 // The initial slow comparison is a size check, the comparison | |
1084 // we want to do is a BoolTest::gt | |
1085 bool always_slow = false; | |
1086 int tv = _igvn.find_int_con(initial_slow_test, -1); | |
1087 if (tv >= 0) { | |
1088 always_slow = (tv == 1); | |
1089 initial_slow_test = NULL; | |
1090 } else { | |
1091 initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn); | |
1092 } | |
1093 | |
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1094 if (C->env()->dtrace_alloc_probes() || |
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1095 !UseTLAB && (!Universe::heap()->supports_inline_contig_alloc() || |
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1096 (UseConcMarkSweepGC && CMSIncrementalMode))) { |
0 | 1097 // Force slow-path allocation |
1098 always_slow = true; | |
1099 initial_slow_test = NULL; | |
1100 } | |
1101 | |
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1102 |
0 | 1103 enum { too_big_or_final_path = 1, need_gc_path = 2 }; |
1104 Node *slow_region = NULL; | |
1105 Node *toobig_false = ctrl; | |
1106 | |
1107 assert (initial_slow_test == NULL || !always_slow, "arguments must be consistent"); | |
1108 // generate the initial test if necessary | |
1109 if (initial_slow_test != NULL ) { | |
1110 slow_region = new (C, 3) RegionNode(3); | |
1111 | |
1112 // Now make the initial failure test. Usually a too-big test but | |
1113 // might be a TRUE for finalizers or a fancy class check for | |
1114 // newInstance0. | |
1115 IfNode *toobig_iff = new (C, 2) IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN); | |
1116 transform_later(toobig_iff); | |
1117 // Plug the failing-too-big test into the slow-path region | |
1118 Node *toobig_true = new (C, 1) IfTrueNode( toobig_iff ); | |
1119 transform_later(toobig_true); | |
1120 slow_region ->init_req( too_big_or_final_path, toobig_true ); | |
1121 toobig_false = new (C, 1) IfFalseNode( toobig_iff ); | |
1122 transform_later(toobig_false); | |
1123 } else { // No initial test, just fall into next case | |
1124 toobig_false = ctrl; | |
1125 debug_only(slow_region = NodeSentinel); | |
1126 } | |
1127 | |
1128 Node *slow_mem = mem; // save the current memory state for slow path | |
1129 // generate the fast allocation code unless we know that the initial test will always go slow | |
1130 if (!always_slow) { | |
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1131 // Fast path modifies only raw memory. |
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1132 if (mem->is_MergeMem()) { |
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1133 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw); |
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1134 } |
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1135 |
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1136 Node* eden_top_adr; |
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1137 Node* eden_end_adr; |
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1138 |
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1139 set_eden_pointers(eden_top_adr, eden_end_adr); |
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1140 |
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1141 // Load Eden::end. Loop invariant and hoisted. |
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1142 // |
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1143 // Note: We set the control input on "eden_end" and "old_eden_top" when using |
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1144 // a TLAB to work around a bug where these values were being moved across |
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1145 // a safepoint. These are not oops, so they cannot be include in the oop |
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1146 // map, but the can be changed by a GC. The proper way to fix this would |
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1147 // be to set the raw memory state when generating a SafepointNode. However |
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1148 // this will require extensive changes to the loop optimization in order to |
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1149 // prevent a degradation of the optimization. |
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1150 // See comment in memnode.hpp, around line 227 in class LoadPNode. |
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1151 Node *eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS); |
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1152 |
0 | 1153 // allocate the Region and Phi nodes for the result |
1154 result_region = new (C, 3) RegionNode(3); | |
1155 result_phi_rawmem = new (C, 3) PhiNode( result_region, Type::MEMORY, TypeRawPtr::BOTTOM ); | |
1156 result_phi_rawoop = new (C, 3) PhiNode( result_region, TypeRawPtr::BOTTOM ); | |
1157 result_phi_i_o = new (C, 3) PhiNode( result_region, Type::ABIO ); // I/O is used for Prefetch | |
1158 | |
1159 // We need a Region for the loop-back contended case. | |
1160 enum { fall_in_path = 1, contended_loopback_path = 2 }; | |
1161 Node *contended_region; | |
1162 Node *contended_phi_rawmem; | |
1163 if( UseTLAB ) { | |
1164 contended_region = toobig_false; | |
1165 contended_phi_rawmem = mem; | |
1166 } else { | |
1167 contended_region = new (C, 3) RegionNode(3); | |
1168 contended_phi_rawmem = new (C, 3) PhiNode( contended_region, Type::MEMORY, TypeRawPtr::BOTTOM); | |
1169 // Now handle the passing-too-big test. We fall into the contended | |
1170 // loop-back merge point. | |
1171 contended_region ->init_req( fall_in_path, toobig_false ); | |
1172 contended_phi_rawmem->init_req( fall_in_path, mem ); | |
1173 transform_later(contended_region); | |
1174 transform_later(contended_phi_rawmem); | |
1175 } | |
1176 | |
1177 // Load(-locked) the heap top. | |
1178 // See note above concerning the control input when using a TLAB | |
1179 Node *old_eden_top = UseTLAB | |
1180 ? new (C, 3) LoadPNode ( ctrl, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ) | |
1181 : new (C, 3) LoadPLockedNode( contended_region, contended_phi_rawmem, eden_top_adr ); | |
1182 | |
1183 transform_later(old_eden_top); | |
1184 // Add to heap top to get a new heap top | |
1185 Node *new_eden_top = new (C, 4) AddPNode( top(), old_eden_top, size_in_bytes ); | |
1186 transform_later(new_eden_top); | |
1187 // Check for needing a GC; compare against heap end | |
1188 Node *needgc_cmp = new (C, 3) CmpPNode( new_eden_top, eden_end ); | |
1189 transform_later(needgc_cmp); | |
1190 Node *needgc_bol = new (C, 2) BoolNode( needgc_cmp, BoolTest::ge ); | |
1191 transform_later(needgc_bol); | |
1192 IfNode *needgc_iff = new (C, 2) IfNode(contended_region, needgc_bol, PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); | |
1193 transform_later(needgc_iff); | |
1194 | |
1195 // Plug the failing-heap-space-need-gc test into the slow-path region | |
1196 Node *needgc_true = new (C, 1) IfTrueNode( needgc_iff ); | |
1197 transform_later(needgc_true); | |
1198 if( initial_slow_test ) { | |
1199 slow_region ->init_req( need_gc_path, needgc_true ); | |
1200 // This completes all paths into the slow merge point | |
1201 transform_later(slow_region); | |
1202 } else { // No initial slow path needed! | |
1203 // Just fall from the need-GC path straight into the VM call. | |
1204 slow_region = needgc_true; | |
1205 } | |
1206 // No need for a GC. Setup for the Store-Conditional | |
1207 Node *needgc_false = new (C, 1) IfFalseNode( needgc_iff ); | |
1208 transform_later(needgc_false); | |
1209 | |
1210 // Grab regular I/O before optional prefetch may change it. | |
1211 // Slow-path does no I/O so just set it to the original I/O. | |
1212 result_phi_i_o->init_req( slow_result_path, i_o ); | |
1213 | |
1214 i_o = prefetch_allocation(i_o, needgc_false, contended_phi_rawmem, | |
1215 old_eden_top, new_eden_top, length); | |
1216 | |
1217 // Store (-conditional) the modified eden top back down. | |
1218 // StorePConditional produces flags for a test PLUS a modified raw | |
1219 // memory state. | |
1220 Node *store_eden_top; | |
1221 Node *fast_oop_ctrl; | |
1222 if( UseTLAB ) { | |
1223 store_eden_top = new (C, 4) StorePNode( needgc_false, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, new_eden_top ); | |
1224 transform_later(store_eden_top); | |
1225 fast_oop_ctrl = needgc_false; // No contention, so this is the fast path | |
1226 } else { | |
1227 store_eden_top = new (C, 5) StorePConditionalNode( needgc_false, contended_phi_rawmem, eden_top_adr, new_eden_top, old_eden_top ); | |
1228 transform_later(store_eden_top); | |
1229 Node *contention_check = new (C, 2) BoolNode( store_eden_top, BoolTest::ne ); | |
1230 transform_later(contention_check); | |
1231 store_eden_top = new (C, 1) SCMemProjNode(store_eden_top); | |
1232 transform_later(store_eden_top); | |
1233 | |
1234 // If not using TLABs, check to see if there was contention. | |
1235 IfNode *contention_iff = new (C, 2) IfNode ( needgc_false, contention_check, PROB_MIN, COUNT_UNKNOWN ); | |
1236 transform_later(contention_iff); | |
1237 Node *contention_true = new (C, 1) IfTrueNode( contention_iff ); | |
1238 transform_later(contention_true); | |
1239 // If contention, loopback and try again. | |
1240 contended_region->init_req( contended_loopback_path, contention_true ); | |
1241 contended_phi_rawmem->init_req( contended_loopback_path, store_eden_top ); | |
1242 | |
1243 // Fast-path succeeded with no contention! | |
1244 Node *contention_false = new (C, 1) IfFalseNode( contention_iff ); | |
1245 transform_later(contention_false); | |
1246 fast_oop_ctrl = contention_false; | |
1247 } | |
1248 | |
1249 // Rename successful fast-path variables to make meaning more obvious | |
1250 Node* fast_oop = old_eden_top; | |
1251 Node* fast_oop_rawmem = store_eden_top; | |
1252 fast_oop_rawmem = initialize_object(alloc, | |
1253 fast_oop_ctrl, fast_oop_rawmem, fast_oop, | |
1254 klass_node, length, size_in_bytes); | |
1255 | |
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1256 if (C->env()->dtrace_extended_probes()) { |
0 | 1257 // Slow-path call |
1258 int size = TypeFunc::Parms + 2; | |
1259 CallLeafNode *call = new (C, size) CallLeafNode(OptoRuntime::dtrace_object_alloc_Type(), | |
1260 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc_base), | |
1261 "dtrace_object_alloc", | |
1262 TypeRawPtr::BOTTOM); | |
1263 | |
1264 // Get base of thread-local storage area | |
1265 Node* thread = new (C, 1) ThreadLocalNode(); | |
1266 transform_later(thread); | |
1267 | |
1268 call->init_req(TypeFunc::Parms+0, thread); | |
1269 call->init_req(TypeFunc::Parms+1, fast_oop); | |
1270 call->init_req( TypeFunc::Control, fast_oop_ctrl ); | |
1271 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1272 call->init_req( TypeFunc::Memory , fast_oop_rawmem ); | |
1273 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1274 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1275 transform_later(call); | |
1276 fast_oop_ctrl = new (C, 1) ProjNode(call,TypeFunc::Control); | |
1277 transform_later(fast_oop_ctrl); | |
1278 fast_oop_rawmem = new (C, 1) ProjNode(call,TypeFunc::Memory); | |
1279 transform_later(fast_oop_rawmem); | |
1280 } | |
1281 | |
1282 // Plug in the successful fast-path into the result merge point | |
1283 result_region ->init_req( fast_result_path, fast_oop_ctrl ); | |
1284 result_phi_rawoop->init_req( fast_result_path, fast_oop ); | |
1285 result_phi_i_o ->init_req( fast_result_path, i_o ); | |
1286 result_phi_rawmem->init_req( fast_result_path, fast_oop_rawmem ); | |
1287 } else { | |
1288 slow_region = ctrl; | |
1289 } | |
1290 | |
1291 // Generate slow-path call | |
1292 CallNode *call = new (C, slow_call_type->domain()->cnt()) | |
1293 CallStaticJavaNode(slow_call_type, slow_call_address, | |
1294 OptoRuntime::stub_name(slow_call_address), | |
1295 alloc->jvms()->bci(), | |
1296 TypePtr::BOTTOM); | |
1297 call->init_req( TypeFunc::Control, slow_region ); | |
1298 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1299 call->init_req( TypeFunc::Memory , slow_mem ); // may gc ptrs | |
1300 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1301 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1302 | |
1303 call->init_req(TypeFunc::Parms+0, klass_node); | |
1304 if (length != NULL) { | |
1305 call->init_req(TypeFunc::Parms+1, length); | |
1306 } | |
1307 | |
1308 // Copy debug information and adjust JVMState information, then replace | |
1309 // allocate node with the call | |
1310 copy_call_debug_info((CallNode *) alloc, call); | |
1311 if (!always_slow) { | |
1312 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
1313 } | |
1314 _igvn.hash_delete(alloc); | |
1315 _igvn.subsume_node(alloc, call); | |
1316 transform_later(call); | |
1317 | |
1318 // Identify the output projections from the allocate node and | |
1319 // adjust any references to them. | |
1320 // The control and io projections look like: | |
1321 // | |
1322 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl) | |
1323 // Allocate Catch | |
1324 // ^---Proj(io) <-------+ ^---CatchProj(io) | |
1325 // | |
1326 // We are interested in the CatchProj nodes. | |
1327 // | |
1328 extract_call_projections(call); | |
1329 | |
1330 // An allocate node has separate memory projections for the uses on the control and i_o paths | |
1331 // Replace uses of the control memory projection with result_phi_rawmem (unless we are only generating a slow call) | |
1332 if (!always_slow && _memproj_fallthrough != NULL) { | |
1333 for (DUIterator_Fast imax, i = _memproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1334 Node *use = _memproj_fallthrough->fast_out(i); | |
1335 _igvn.hash_delete(use); | |
1336 imax -= replace_input(use, _memproj_fallthrough, result_phi_rawmem); | |
1337 _igvn._worklist.push(use); | |
1338 // back up iterator | |
1339 --i; | |
1340 } | |
1341 } | |
1342 // Now change uses of _memproj_catchall to use _memproj_fallthrough and delete _memproj_catchall so | |
1343 // we end up with a call that has only 1 memory projection | |
1344 if (_memproj_catchall != NULL ) { | |
1345 if (_memproj_fallthrough == NULL) { | |
1346 _memproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::Memory); | |
1347 transform_later(_memproj_fallthrough); | |
1348 } | |
1349 for (DUIterator_Fast imax, i = _memproj_catchall->fast_outs(imax); i < imax; i++) { | |
1350 Node *use = _memproj_catchall->fast_out(i); | |
1351 _igvn.hash_delete(use); | |
1352 imax -= replace_input(use, _memproj_catchall, _memproj_fallthrough); | |
1353 _igvn._worklist.push(use); | |
1354 // back up iterator | |
1355 --i; | |
1356 } | |
1357 } | |
1358 | |
1359 // An allocate node has separate i_o projections for the uses on the control and i_o paths | |
1360 // Replace uses of the control i_o projection with result_phi_i_o (unless we are only generating a slow call) | |
1361 if (_ioproj_fallthrough == NULL) { | |
1362 _ioproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::I_O); | |
1363 transform_later(_ioproj_fallthrough); | |
1364 } else if (!always_slow) { | |
1365 for (DUIterator_Fast imax, i = _ioproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1366 Node *use = _ioproj_fallthrough->fast_out(i); | |
1367 | |
1368 _igvn.hash_delete(use); | |
1369 imax -= replace_input(use, _ioproj_fallthrough, result_phi_i_o); | |
1370 _igvn._worklist.push(use); | |
1371 // back up iterator | |
1372 --i; | |
1373 } | |
1374 } | |
1375 // Now change uses of _ioproj_catchall to use _ioproj_fallthrough and delete _ioproj_catchall so | |
1376 // we end up with a call that has only 1 control projection | |
1377 if (_ioproj_catchall != NULL ) { | |
1378 for (DUIterator_Fast imax, i = _ioproj_catchall->fast_outs(imax); i < imax; i++) { | |
1379 Node *use = _ioproj_catchall->fast_out(i); | |
1380 _igvn.hash_delete(use); | |
1381 imax -= replace_input(use, _ioproj_catchall, _ioproj_fallthrough); | |
1382 _igvn._worklist.push(use); | |
1383 // back up iterator | |
1384 --i; | |
1385 } | |
1386 } | |
1387 | |
1388 // if we generated only a slow call, we are done | |
1389 if (always_slow) | |
1390 return; | |
1391 | |
1392 | |
1393 if (_fallthroughcatchproj != NULL) { | |
1394 ctrl = _fallthroughcatchproj->clone(); | |
1395 transform_later(ctrl); | |
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1396 _igvn.replace_node(_fallthroughcatchproj, result_region); |
0 | 1397 } else { |
1398 ctrl = top(); | |
1399 } | |
1400 Node *slow_result; | |
1401 if (_resproj == NULL) { | |
1402 // no uses of the allocation result | |
1403 slow_result = top(); | |
1404 } else { | |
1405 slow_result = _resproj->clone(); | |
1406 transform_later(slow_result); | |
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1407 _igvn.replace_node(_resproj, result_phi_rawoop); |
0 | 1408 } |
1409 | |
1410 // Plug slow-path into result merge point | |
1411 result_region ->init_req( slow_result_path, ctrl ); | |
1412 result_phi_rawoop->init_req( slow_result_path, slow_result); | |
1413 result_phi_rawmem->init_req( slow_result_path, _memproj_fallthrough ); | |
1414 transform_later(result_region); | |
1415 transform_later(result_phi_rawoop); | |
1416 transform_later(result_phi_rawmem); | |
1417 transform_later(result_phi_i_o); | |
1418 // This completes all paths into the result merge point | |
1419 } | |
1420 | |
1421 | |
1422 // Helper for PhaseMacroExpand::expand_allocate_common. | |
1423 // Initializes the newly-allocated storage. | |
1424 Node* | |
1425 PhaseMacroExpand::initialize_object(AllocateNode* alloc, | |
1426 Node* control, Node* rawmem, Node* object, | |
1427 Node* klass_node, Node* length, | |
1428 Node* size_in_bytes) { | |
1429 InitializeNode* init = alloc->initialization(); | |
1430 // Store the klass & mark bits | |
1431 Node* mark_node = NULL; | |
1432 // For now only enable fast locking for non-array types | |
1433 if (UseBiasedLocking && (length == NULL)) { | |
1434 mark_node = make_load(NULL, rawmem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeRawPtr::BOTTOM, T_ADDRESS); | |
1435 } else { | |
1436 mark_node = makecon(TypeRawPtr::make((address)markOopDesc::prototype())); | |
1437 } | |
1438 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS); | |
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1439 |
0 | 1440 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_OBJECT); |
1441 int header_size = alloc->minimum_header_size(); // conservatively small | |
1442 | |
1443 // Array length | |
1444 if (length != NULL) { // Arrays need length field | |
1445 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT); | |
1446 // conservatively small header size: | |
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1447 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE); |
0 | 1448 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass(); |
1449 if (k->is_array_klass()) // we know the exact header size in most cases: | |
1450 header_size = Klass::layout_helper_header_size(k->layout_helper()); | |
1451 } | |
1452 | |
1453 // Clear the object body, if necessary. | |
1454 if (init == NULL) { | |
1455 // The init has somehow disappeared; be cautious and clear everything. | |
1456 // | |
1457 // This can happen if a node is allocated but an uncommon trap occurs | |
1458 // immediately. In this case, the Initialize gets associated with the | |
1459 // trap, and may be placed in a different (outer) loop, if the Allocate | |
1460 // is in a loop. If (this is rare) the inner loop gets unrolled, then | |
1461 // there can be two Allocates to one Initialize. The answer in all these | |
1462 // edge cases is safety first. It is always safe to clear immediately | |
1463 // within an Allocate, and then (maybe or maybe not) clear some more later. | |
1464 if (!ZeroTLAB) | |
1465 rawmem = ClearArrayNode::clear_memory(control, rawmem, object, | |
1466 header_size, size_in_bytes, | |
1467 &_igvn); | |
1468 } else { | |
1469 if (!init->is_complete()) { | |
1470 // Try to win by zeroing only what the init does not store. | |
1471 // We can also try to do some peephole optimizations, | |
1472 // such as combining some adjacent subword stores. | |
1473 rawmem = init->complete_stores(control, rawmem, object, | |
1474 header_size, size_in_bytes, &_igvn); | |
1475 } | |
1476 // We have no more use for this link, since the AllocateNode goes away: | |
1477 init->set_req(InitializeNode::RawAddress, top()); | |
1478 // (If we keep the link, it just confuses the register allocator, | |
1479 // who thinks he sees a real use of the address by the membar.) | |
1480 } | |
1481 | |
1482 return rawmem; | |
1483 } | |
1484 | |
1485 // Generate prefetch instructions for next allocations. | |
1486 Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false, | |
1487 Node*& contended_phi_rawmem, | |
1488 Node* old_eden_top, Node* new_eden_top, | |
1489 Node* length) { | |
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1490 enum { fall_in_path = 1, pf_path = 2 }; |
0 | 1491 if( UseTLAB && AllocatePrefetchStyle == 2 ) { |
1492 // Generate prefetch allocation with watermark check. | |
1493 // As an allocation hits the watermark, we will prefetch starting | |
1494 // at a "distance" away from watermark. | |
1495 | |
1496 Node *pf_region = new (C, 3) RegionNode(3); | |
1497 Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY, | |
1498 TypeRawPtr::BOTTOM ); | |
1499 // I/O is used for Prefetch | |
1500 Node *pf_phi_abio = new (C, 3) PhiNode( pf_region, Type::ABIO ); | |
1501 | |
1502 Node *thread = new (C, 1) ThreadLocalNode(); | |
1503 transform_later(thread); | |
1504 | |
1505 Node *eden_pf_adr = new (C, 4) AddPNode( top()/*not oop*/, thread, | |
1506 _igvn.MakeConX(in_bytes(JavaThread::tlab_pf_top_offset())) ); | |
1507 transform_later(eden_pf_adr); | |
1508 | |
1509 Node *old_pf_wm = new (C, 3) LoadPNode( needgc_false, | |
1510 contended_phi_rawmem, eden_pf_adr, | |
1511 TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); | |
1512 transform_later(old_pf_wm); | |
1513 | |
1514 // check against new_eden_top | |
1515 Node *need_pf_cmp = new (C, 3) CmpPNode( new_eden_top, old_pf_wm ); | |
1516 transform_later(need_pf_cmp); | |
1517 Node *need_pf_bol = new (C, 2) BoolNode( need_pf_cmp, BoolTest::ge ); | |
1518 transform_later(need_pf_bol); | |
1519 IfNode *need_pf_iff = new (C, 2) IfNode( needgc_false, need_pf_bol, | |
1520 PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); | |
1521 transform_later(need_pf_iff); | |
1522 | |
1523 // true node, add prefetchdistance | |
1524 Node *need_pf_true = new (C, 1) IfTrueNode( need_pf_iff ); | |
1525 transform_later(need_pf_true); | |
1526 | |
1527 Node *need_pf_false = new (C, 1) IfFalseNode( need_pf_iff ); | |
1528 transform_later(need_pf_false); | |
1529 | |
1530 Node *new_pf_wmt = new (C, 4) AddPNode( top(), old_pf_wm, | |
1531 _igvn.MakeConX(AllocatePrefetchDistance) ); | |
1532 transform_later(new_pf_wmt ); | |
1533 new_pf_wmt->set_req(0, need_pf_true); | |
1534 | |
1535 Node *store_new_wmt = new (C, 4) StorePNode( need_pf_true, | |
1536 contended_phi_rawmem, eden_pf_adr, | |
1537 TypeRawPtr::BOTTOM, new_pf_wmt ); | |
1538 transform_later(store_new_wmt); | |
1539 | |
1540 // adding prefetches | |
1541 pf_phi_abio->init_req( fall_in_path, i_o ); | |
1542 | |
1543 Node *prefetch_adr; | |
1544 Node *prefetch; | |
1545 uint lines = AllocatePrefetchDistance / AllocatePrefetchStepSize; | |
1546 uint step_size = AllocatePrefetchStepSize; | |
1547 uint distance = 0; | |
1548 | |
1549 for ( uint i = 0; i < lines; i++ ) { | |
1550 prefetch_adr = new (C, 4) AddPNode( old_pf_wm, new_pf_wmt, | |
1551 _igvn.MakeConX(distance) ); | |
1552 transform_later(prefetch_adr); | |
1553 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1554 transform_later(prefetch); | |
1555 distance += step_size; | |
1556 i_o = prefetch; | |
1557 } | |
1558 pf_phi_abio->set_req( pf_path, i_o ); | |
1559 | |
1560 pf_region->init_req( fall_in_path, need_pf_false ); | |
1561 pf_region->init_req( pf_path, need_pf_true ); | |
1562 | |
1563 pf_phi_rawmem->init_req( fall_in_path, contended_phi_rawmem ); | |
1564 pf_phi_rawmem->init_req( pf_path, store_new_wmt ); | |
1565 | |
1566 transform_later(pf_region); | |
1567 transform_later(pf_phi_rawmem); | |
1568 transform_later(pf_phi_abio); | |
1569 | |
1570 needgc_false = pf_region; | |
1571 contended_phi_rawmem = pf_phi_rawmem; | |
1572 i_o = pf_phi_abio; | |
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1573 } else if( UseTLAB && AllocatePrefetchStyle == 3 ) { |
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1574 // Insert a prefetch for each allocation only on the fast-path |
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1575 Node *pf_region = new (C, 3) RegionNode(3); |
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1576 Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY, |
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1577 TypeRawPtr::BOTTOM ); |
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1578 |
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1579 // Generate several prefetch instructions only for arrays. |
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1580 uint lines = (length != NULL) ? AllocatePrefetchLines : 1; |
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1581 uint step_size = AllocatePrefetchStepSize; |
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1582 uint distance = AllocatePrefetchDistance; |
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1583 |
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1584 // Next cache address. |
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1585 Node *cache_adr = new (C, 4) AddPNode(old_eden_top, old_eden_top, |
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1586 _igvn.MakeConX(distance)); |
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1587 transform_later(cache_adr); |
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1588 cache_adr = new (C, 2) CastP2XNode(needgc_false, cache_adr); |
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1589 transform_later(cache_adr); |
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1590 Node* mask = _igvn.MakeConX(~(intptr_t)(step_size-1)); |
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1591 cache_adr = new (C, 3) AndXNode(cache_adr, mask); |
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1592 transform_later(cache_adr); |
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1593 cache_adr = new (C, 2) CastX2PNode(cache_adr); |
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1594 transform_later(cache_adr); |
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1595 |
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1596 // Prefetch |
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1597 Node *prefetch = new (C, 3) PrefetchWriteNode( contended_phi_rawmem, cache_adr ); |
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1598 prefetch->set_req(0, needgc_false); |
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1599 transform_later(prefetch); |
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1600 contended_phi_rawmem = prefetch; |
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1601 Node *prefetch_adr; |
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1602 distance = step_size; |
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1603 for ( uint i = 1; i < lines; i++ ) { |
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1604 prefetch_adr = new (C, 4) AddPNode( cache_adr, cache_adr, |
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1605 _igvn.MakeConX(distance) ); |
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1606 transform_later(prefetch_adr); |
9e321dcfa5b7
6940726: Use BIS instruction for allocation prefetch on Sparc
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changeset
|
1607 prefetch = new (C, 3) PrefetchWriteNode( contended_phi_rawmem, prefetch_adr ); |
9e321dcfa5b7
6940726: Use BIS instruction for allocation prefetch on Sparc
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changeset
|
1608 transform_later(prefetch); |
9e321dcfa5b7
6940726: Use BIS instruction for allocation prefetch on Sparc
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diff
changeset
|
1609 distance += step_size; |
9e321dcfa5b7
6940726: Use BIS instruction for allocation prefetch on Sparc
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diff
changeset
|
1610 contended_phi_rawmem = prefetch; |
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|
1611 } |
0 | 1612 } else if( AllocatePrefetchStyle > 0 ) { |
1613 // Insert a prefetch for each allocation only on the fast-path | |
1614 Node *prefetch_adr; | |
1615 Node *prefetch; | |
1616 // Generate several prefetch instructions only for arrays. | |
1617 uint lines = (length != NULL) ? AllocatePrefetchLines : 1; | |
1618 uint step_size = AllocatePrefetchStepSize; | |
1619 uint distance = AllocatePrefetchDistance; | |
1620 for ( uint i = 0; i < lines; i++ ) { | |
1621 prefetch_adr = new (C, 4) AddPNode( old_eden_top, new_eden_top, | |
1622 _igvn.MakeConX(distance) ); | |
1623 transform_later(prefetch_adr); | |
1624 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1625 // Do not let it float too high, since if eden_top == eden_end, | |
1626 // both might be null. | |
1627 if( i == 0 ) { // Set control for first prefetch, next follows it | |
1628 prefetch->init_req(0, needgc_false); | |
1629 } | |
1630 transform_later(prefetch); | |
1631 distance += step_size; | |
1632 i_o = prefetch; | |
1633 } | |
1634 } | |
1635 return i_o; | |
1636 } | |
1637 | |
1638 | |
1639 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) { | |
1640 expand_allocate_common(alloc, NULL, | |
1641 OptoRuntime::new_instance_Type(), | |
1642 OptoRuntime::new_instance_Java()); | |
1643 } | |
1644 | |
1645 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) { | |
1646 Node* length = alloc->in(AllocateNode::ALength); | |
1647 expand_allocate_common(alloc, length, | |
1648 OptoRuntime::new_array_Type(), | |
1649 OptoRuntime::new_array_Java()); | |
1650 } | |
1651 | |
1652 | |
1653 // we have determined that this lock/unlock can be eliminated, we simply | |
1654 // eliminate the node without expanding it. | |
1655 // | |
1656 // Note: The membar's associated with the lock/unlock are currently not | |
1657 // eliminated. This should be investigated as a future enhancement. | |
1658 // | |
66
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|
1659 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) { |
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|
1660 |
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|
1661 if (!alock->is_eliminated()) { |
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6672848: (Escape Analysis) improve lock elimination with EA
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|
1662 return false; |
6dbf1a175d6b
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|
1663 } |
460
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|
1664 if (alock->is_Lock() && !alock->is_coarsened()) { |
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changeset
|
1665 // Create new "eliminated" BoxLock node and use it |
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1666 // in monitor debug info for the same object. |
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|
1667 BoxLockNode* oldbox = alock->box_node()->as_BoxLock(); |
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|
1668 Node* obj = alock->obj_node(); |
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|
1669 if (!oldbox->is_eliminated()) { |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1670 BoxLockNode* newbox = oldbox->clone()->as_BoxLock(); |
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|
1671 newbox->set_eliminated(); |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1672 transform_later(newbox); |
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|
1673 // Replace old box node with new box for all users |
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|
1674 // of the same object. |
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|
1675 for (uint i = 0; i < oldbox->outcnt();) { |
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|
1676 |
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|
1677 bool next_edge = true; |
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|
1678 Node* u = oldbox->raw_out(i); |
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|
1679 if (u == alock) { |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1680 i++; |
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|
1681 continue; // It will be removed below |
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|
1682 } |
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|
1683 if (u->is_Lock() && |
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|
1684 u->as_Lock()->obj_node() == obj && |
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|
1685 // oldbox could be referenced in debug info also |
424f9bfe6b96
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|
1686 u->as_Lock()->box_node() == oldbox) { |
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|
1687 assert(u->as_Lock()->is_eliminated(), "sanity"); |
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|
1688 _igvn.hash_delete(u); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1689 u->set_req(TypeFunc::Parms + 1, newbox); |
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diff
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|
1690 next_edge = false; |
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diff
changeset
|
1691 #ifdef ASSERT |
424f9bfe6b96
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diff
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|
1692 } 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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diff
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|
1693 assert(u->as_Unlock()->is_eliminated(), "sanity"); |
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diff
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|
1694 #endif |
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|
1695 } |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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parents:
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diff
changeset
|
1696 // Replace old box in monitor debug info. |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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parents:
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diff
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|
1697 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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parents:
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diff
changeset
|
1698 SafePointNode* sfn = u->as_SafePoint(); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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parents:
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diff
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|
1699 JVMState* youngest_jvms = sfn->jvms(); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
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|
1700 int max_depth = youngest_jvms->depth(); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
changeset
|
1701 for (int depth = 1; depth <= max_depth; depth++) { |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1702 JVMState* jvms = youngest_jvms->of_depth(depth); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
changeset
|
1703 int num_mon = jvms->nof_monitors(); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
changeset
|
1704 // Loop over monitors |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
changeset
|
1705 for (int idx = 0; idx < num_mon; idx++) { |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
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|
1706 Node* obj_node = sfn->monitor_obj(jvms, idx); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
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diff
changeset
|
1707 Node* box_node = sfn->monitor_box(jvms, idx); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
changeset
|
1708 if (box_node == oldbox && obj_node == obj) { |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
changeset
|
1709 int j = jvms->monitor_box_offset(idx); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
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|
1710 _igvn.hash_delete(u); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
changeset
|
1711 u->set_req(j, newbox); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
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436
diff
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|
1712 next_edge = false; |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1713 } |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1714 } // for (int idx = 0; |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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436
diff
changeset
|
1715 } // for (int depth = 1; |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1716 } // if (u->is_SafePoint() |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1717 if (next_edge) i++; |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1718 } // for (uint i = 0; i < oldbox->outcnt();) |
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|
1719 } // if (!oldbox->is_eliminated()) |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1720 } // if (alock->is_Lock() && !lock->is_coarsened()) |
66
6dbf1a175d6b
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|
1721 |
1080
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1722 CompileLog* log = C->log(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1723 if (log != NULL) { |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1724 log->head("eliminate_lock lock='%d'", |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1725 alock->is_Lock()); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1726 JVMState* p = alock->jvms(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1727 while (p != NULL) { |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1728 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1729 p = p->caller(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1730 } |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1731 log->tail("eliminate_lock"); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1732 } |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1733 |
66
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|
1734 #ifndef PRODUCT |
6dbf1a175d6b
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63
diff
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|
1735 if (PrintEliminateLocks) { |
6dbf1a175d6b
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diff
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|
1736 if (alock->is_Lock()) { |
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changeset
|
1737 tty->print_cr("++++ Eliminating: %d Lock", alock->_idx); |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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changeset
|
1738 } else { |
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changeset
|
1739 tty->print_cr("++++ Eliminating: %d Unlock", alock->_idx); |
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6672848: (Escape Analysis) improve lock elimination with EA
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changeset
|
1740 } |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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63
diff
changeset
|
1741 } |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1742 #endif |
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changeset
|
1743 |
6dbf1a175d6b
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changeset
|
1744 Node* mem = alock->in(TypeFunc::Memory); |
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|
1745 Node* ctrl = alock->in(TypeFunc::Control); |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1746 |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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63
diff
changeset
|
1747 extract_call_projections(alock); |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1748 // There are 2 projections from the lock. The lock node will |
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6672848: (Escape Analysis) improve lock elimination with EA
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|
1749 // be deleted when its last use is subsumed below. |
6dbf1a175d6b
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diff
changeset
|
1750 assert(alock->outcnt() == 2 && |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1751 _fallthroughproj != NULL && |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1752 _memproj_fallthrough != NULL, |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1753 "Unexpected projections from Lock/Unlock"); |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1754 |
6dbf1a175d6b
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diff
changeset
|
1755 Node* fallthroughproj = _fallthroughproj; |
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|
1756 Node* memproj_fallthrough = _memproj_fallthrough; |
0 | 1757 |
1758 // The memory projection from a lock/unlock is RawMem | |
1759 // The input to a Lock is merged memory, so extract its RawMem input | |
1760 // (unless the MergeMem has been optimized away.) | |
1761 if (alock->is_Lock()) { | |
66
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1762 // Seach for MemBarAcquire node and delete it also. |
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1763 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar(); |
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1764 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquire, ""); |
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1765 Node* ctrlproj = membar->proj_out(TypeFunc::Control); |
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1766 Node* memproj = membar->proj_out(TypeFunc::Memory); |
708
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1767 _igvn.replace_node(ctrlproj, fallthroughproj); |
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1768 _igvn.replace_node(memproj, memproj_fallthrough); |
460
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1769 |
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1770 // Delete FastLock node also if this Lock node is unique user |
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1771 // (a loop peeling may clone a Lock node). |
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1772 Node* flock = alock->as_Lock()->fastlock_node(); |
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1773 if (flock->outcnt() == 1) { |
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1774 assert(flock->unique_out() == alock, "sanity"); |
708
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1775 _igvn.replace_node(flock, top()); |
460
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1776 } |
0 | 1777 } |
1778 | |
66
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1779 // Seach for MemBarRelease node and delete it also. |
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1780 if (alock->is_Unlock() && ctrl != NULL && ctrl->is_Proj() && |
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1781 ctrl->in(0)->is_MemBar()) { |
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1782 MemBarNode* membar = ctrl->in(0)->as_MemBar(); |
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1783 assert(membar->Opcode() == Op_MemBarRelease && |
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1784 mem->is_Proj() && membar == mem->in(0), ""); |
708
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1785 _igvn.replace_node(fallthroughproj, ctrl); |
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1786 _igvn.replace_node(memproj_fallthrough, mem); |
66
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1787 fallthroughproj = ctrl; |
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1788 memproj_fallthrough = mem; |
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1789 ctrl = membar->in(TypeFunc::Control); |
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1790 mem = membar->in(TypeFunc::Memory); |
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1791 } |
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|
1792 |
708
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1793 _igvn.replace_node(fallthroughproj, ctrl); |
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1794 _igvn.replace_node(memproj_fallthrough, mem); |
66
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1795 return true; |
0 | 1796 } |
1797 | |
1798 | |
1799 //------------------------------expand_lock_node---------------------- | |
1800 void PhaseMacroExpand::expand_lock_node(LockNode *lock) { | |
1801 | |
1802 Node* ctrl = lock->in(TypeFunc::Control); | |
1803 Node* mem = lock->in(TypeFunc::Memory); | |
1804 Node* obj = lock->obj_node(); | |
1805 Node* box = lock->box_node(); | |
66
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1806 Node* flock = lock->fastlock_node(); |
0 | 1807 |
1808 // Make the merge point | |
420
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1809 Node *region; |
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1810 Node *mem_phi; |
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1811 Node *slow_path; |
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1812 |
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1813 if (UseOptoBiasInlining) { |
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1814 /* |
605 | 1815 * See the full description in MacroAssembler::biased_locking_enter(). |
420
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1816 * |
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1817 * if( (mark_word & biased_lock_mask) == biased_lock_pattern ) { |
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1818 * // The object is biased. |
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1819 * proto_node = klass->prototype_header; |
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1820 * o_node = thread | proto_node; |
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1821 * x_node = o_node ^ mark_word; |
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1822 * if( (x_node & ~age_mask) == 0 ) { // Biased to the current thread ? |
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1823 * // Done. |
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1824 * } else { |
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1825 * if( (x_node & biased_lock_mask) != 0 ) { |
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1826 * // The klass's prototype header is no longer biased. |
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1827 * cas(&mark_word, mark_word, proto_node) |
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|
1828 * goto cas_lock; |
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|
1829 * } else { |
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1830 * // The klass's prototype header is still biased. |
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1831 * if( (x_node & epoch_mask) != 0 ) { // Expired epoch? |
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1832 * old = mark_word; |
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1833 * new = o_node; |
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1834 * } else { |
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1835 * // Different thread or anonymous biased. |
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1836 * old = mark_word & (epoch_mask | age_mask | biased_lock_mask); |
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1837 * new = thread | old; |
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|
1838 * } |
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1839 * // Try to rebias. |
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1840 * if( cas(&mark_word, old, new) == 0 ) { |
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1841 * // Done. |
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1842 * } else { |
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|
1843 * goto slow_path; // Failed. |
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|
1844 * } |
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|
1845 * } |
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1846 * } |
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|
1847 * } else { |
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|
1848 * // The object is not biased. |
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|
1849 * cas_lock: |
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1850 * if( FastLock(obj) == 0 ) { |
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|
1851 * // Done. |
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|
1852 * } else { |
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|
1853 * slow_path: |
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1854 * OptoRuntime::complete_monitor_locking_Java(obj); |
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|
1855 * } |
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1856 * } |
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1857 */ |
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|
1858 |
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1859 region = new (C, 5) RegionNode(5); |
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|
1860 // create a Phi for the memory state |
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1861 mem_phi = new (C, 5) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1862 |
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1863 Node* fast_lock_region = new (C, 3) RegionNode(3); |
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1864 Node* fast_lock_mem_phi = new (C, 3) PhiNode( fast_lock_region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1865 |
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1866 // First, check mark word for the biased lock pattern. |
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1867 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
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1868 |
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1869 // Get fast path - mark word has the biased lock pattern. |
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1870 ctrl = opt_bits_test(ctrl, fast_lock_region, 1, mark_node, |
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1871 markOopDesc::biased_lock_mask_in_place, |
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1872 markOopDesc::biased_lock_pattern, true); |
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1873 // fast_lock_region->in(1) is set to slow path. |
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1874 fast_lock_mem_phi->init_req(1, mem); |
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|
1875 |
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1876 // Now check that the lock is biased to the current thread and has |
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1877 // the same epoch and bias as Klass::_prototype_header. |
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1878 |
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1879 // Special-case a fresh allocation to avoid building nodes: |
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1880 Node* klass_node = AllocateNode::Ideal_klass(obj, &_igvn); |
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1881 if (klass_node == NULL) { |
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1882 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); |
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1883 klass_node = transform_later( LoadKlassNode::make(_igvn, mem, k_adr, _igvn.type(k_adr)->is_ptr()) ); |
490
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1884 #ifdef _LP64 |
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1885 if (UseCompressedOops && klass_node->is_DecodeN()) { |
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1886 assert(klass_node->in(1)->Opcode() == Op_LoadNKlass, "sanity"); |
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1887 klass_node->in(1)->init_req(0, ctrl); |
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1888 } else |
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|
1889 #endif |
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1890 klass_node->init_req(0, ctrl); |
420
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1891 } |
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1892 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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|
1893 |
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1894 Node* thread = transform_later(new (C, 1) ThreadLocalNode()); |
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1895 Node* cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread)); |
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1896 Node* o_node = transform_later(new (C, 3) OrXNode(cast_thread, proto_node)); |
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1897 Node* x_node = transform_later(new (C, 3) XorXNode(o_node, mark_node)); |
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1898 |
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|
1899 // Get slow path - mark word does NOT match the value. |
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1900 Node* not_biased_ctrl = opt_bits_test(ctrl, region, 3, x_node, |
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1901 (~markOopDesc::age_mask_in_place), 0); |
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1902 // region->in(3) is set to fast path - the object is biased to the current thread. |
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1903 mem_phi->init_req(3, mem); |
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1904 |
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1905 |
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1906 // Mark word does NOT match the value (thread | Klass::_prototype_header). |
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1907 |
0 | 1908 |
420
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1909 // First, check biased pattern. |
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1910 // Get fast path - _prototype_header has the same biased lock pattern. |
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1911 ctrl = opt_bits_test(not_biased_ctrl, fast_lock_region, 2, x_node, |
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1912 markOopDesc::biased_lock_mask_in_place, 0, true); |
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1913 |
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1914 not_biased_ctrl = fast_lock_region->in(2); // Slow path |
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1915 // fast_lock_region->in(2) - the prototype header is no longer biased |
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1916 // and we have to revoke the bias on this object. |
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1917 // We are going to try to reset the mark of this object to the prototype |
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1918 // value and fall through to the CAS-based locking scheme. |
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1919 Node* adr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes()); |
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1920 Node* cas = new (C, 5) StoreXConditionalNode(not_biased_ctrl, mem, adr, |
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1921 proto_node, mark_node); |
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1922 transform_later(cas); |
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1923 Node* proj = transform_later( new (C, 1) SCMemProjNode(cas)); |
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1924 fast_lock_mem_phi->init_req(2, proj); |
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1925 |
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1926 |
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1927 // Second, check epoch bits. |
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1928 Node* rebiased_region = new (C, 3) RegionNode(3); |
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1929 Node* old_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X); |
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1930 Node* new_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X); |
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1931 |
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1932 // Get slow path - mark word does NOT match epoch bits. |
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1933 Node* epoch_ctrl = opt_bits_test(ctrl, rebiased_region, 1, x_node, |
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1934 markOopDesc::epoch_mask_in_place, 0); |
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1935 // The epoch of the current bias is not valid, attempt to rebias the object |
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1936 // toward the current thread. |
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1937 rebiased_region->init_req(2, epoch_ctrl); |
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1938 old_phi->init_req(2, mark_node); |
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1939 new_phi->init_req(2, o_node); |
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1940 |
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1941 // rebiased_region->in(1) is set to fast path. |
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1942 // The epoch of the current bias is still valid but we know |
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1943 // nothing about the owner; it might be set or it might be clear. |
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1944 Node* cmask = MakeConX(markOopDesc::biased_lock_mask_in_place | |
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1945 markOopDesc::age_mask_in_place | |
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1946 markOopDesc::epoch_mask_in_place); |
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1947 Node* old = transform_later(new (C, 3) AndXNode(mark_node, cmask)); |
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1948 cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread)); |
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1949 Node* new_mark = transform_later(new (C, 3) OrXNode(cast_thread, old)); |
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1950 old_phi->init_req(1, old); |
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1951 new_phi->init_req(1, new_mark); |
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1952 |
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1953 transform_later(rebiased_region); |
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1954 transform_later(old_phi); |
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1955 transform_later(new_phi); |
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1956 |
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1957 // Try to acquire the bias of the object using an atomic operation. |
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1958 // If this fails we will go in to the runtime to revoke the object's bias. |
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1959 cas = new (C, 5) StoreXConditionalNode(rebiased_region, mem, adr, |
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1960 new_phi, old_phi); |
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1961 transform_later(cas); |
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1962 proj = transform_later( new (C, 1) SCMemProjNode(cas)); |
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1963 |
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1964 // Get slow path - Failed to CAS. |
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1965 not_biased_ctrl = opt_bits_test(rebiased_region, region, 4, cas, 0, 0); |
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1966 mem_phi->init_req(4, proj); |
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1967 // region->in(4) is set to fast path - the object is rebiased to the current thread. |
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1968 |
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1969 // Failed to CAS. |
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1970 slow_path = new (C, 3) RegionNode(3); |
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1971 Node *slow_mem = new (C, 3) PhiNode( slow_path, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1972 |
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1973 slow_path->init_req(1, not_biased_ctrl); // Capture slow-control |
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1974 slow_mem->init_req(1, proj); |
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1975 |
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1976 // Call CAS-based locking scheme (FastLock node). |
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1977 |
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1978 transform_later(fast_lock_region); |
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1979 transform_later(fast_lock_mem_phi); |
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1980 |
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1981 // Get slow path - FastLock failed to lock the object. |
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1982 ctrl = opt_bits_test(fast_lock_region, region, 2, flock, 0, 0); |
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1983 mem_phi->init_req(2, fast_lock_mem_phi); |
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1984 // region->in(2) is set to fast path - the object is locked to the current thread. |
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1985 |
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1986 slow_path->init_req(2, ctrl); // Capture slow-control |
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1987 slow_mem->init_req(2, fast_lock_mem_phi); |
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1988 |
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1989 transform_later(slow_path); |
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1990 transform_later(slow_mem); |
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1991 // Reset lock's memory edge. |
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1992 lock->set_req(TypeFunc::Memory, slow_mem); |
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1993 |
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1994 } else { |
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1995 region = new (C, 3) RegionNode(3); |
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1996 // create a Phi for the memory state |
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1997 mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1998 |
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1999 // Optimize test; set region slot 2 |
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2000 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0); |
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2001 mem_phi->init_req(2, mem); |
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2002 } |
0 | 2003 |
2004 // Make slow path call | |
2005 CallNode *call = make_slow_call( (CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(), OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path, obj, box ); | |
2006 | |
2007 extract_call_projections(call); | |
2008 | |
2009 // Slow path can only throw asynchronous exceptions, which are always | |
2010 // de-opted. So the compiler thinks the slow-call can never throw an | |
2011 // exception. If it DOES throw an exception we would need the debug | |
2012 // info removed first (since if it throws there is no monitor). | |
2013 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
2014 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
2015 | |
2016 // Capture slow path | |
2017 // disconnect fall-through projection from call and create a new one | |
2018 // hook up users of fall-through projection to region | |
2019 Node *slow_ctrl = _fallthroughproj->clone(); | |
2020 transform_later(slow_ctrl); | |
2021 _igvn.hash_delete(_fallthroughproj); | |
2022 _fallthroughproj->disconnect_inputs(NULL); | |
2023 region->init_req(1, slow_ctrl); | |
2024 // region inputs are now complete | |
2025 transform_later(region); | |
708
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2026 _igvn.replace_node(_fallthroughproj, region); |
0 | 2027 |
420
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2028 Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) ); |
0 | 2029 mem_phi->init_req(1, memproj ); |
2030 transform_later(mem_phi); | |
708
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2031 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 2032 } |
2033 | |
2034 //------------------------------expand_unlock_node---------------------- | |
2035 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) { | |
2036 | |
66
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2037 Node* ctrl = unlock->in(TypeFunc::Control); |
0 | 2038 Node* mem = unlock->in(TypeFunc::Memory); |
2039 Node* obj = unlock->obj_node(); | |
2040 Node* box = unlock->box_node(); | |
2041 | |
2042 // No need for a null check on unlock | |
2043 | |
2044 // Make the merge point | |
420
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2045 Node *region; |
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2046 Node *mem_phi; |
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2047 |
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2048 if (UseOptoBiasInlining) { |
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2049 // Check for biased locking unlock case, which is a no-op. |
605 | 2050 // See the full description in MacroAssembler::biased_locking_exit(). |
420
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2051 region = new (C, 4) RegionNode(4); |
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2052 // create a Phi for the memory state |
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2053 mem_phi = new (C, 4) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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2054 mem_phi->init_req(3, mem); |
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2055 |
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2056 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
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2057 ctrl = opt_bits_test(ctrl, region, 3, mark_node, |
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2058 markOopDesc::biased_lock_mask_in_place, |
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2059 markOopDesc::biased_lock_pattern); |
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2060 } else { |
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2061 region = new (C, 3) RegionNode(3); |
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2062 // create a Phi for the memory state |
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2063 mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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2064 } |
0 | 2065 |
2066 FastUnlockNode *funlock = new (C, 3) FastUnlockNode( ctrl, obj, box ); | |
2067 funlock = transform_later( funlock )->as_FastUnlock(); | |
2068 // Optimize test; set region slot 2 | |
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2069 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0); |
0 | 2070 |
2071 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 ); | |
2072 | |
2073 extract_call_projections(call); | |
2074 | |
2075 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
2076 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
2077 | |
2078 // No exceptions for unlocking | |
2079 // Capture slow path | |
2080 // disconnect fall-through projection from call and create a new one | |
2081 // hook up users of fall-through projection to region | |
2082 Node *slow_ctrl = _fallthroughproj->clone(); | |
2083 transform_later(slow_ctrl); | |
2084 _igvn.hash_delete(_fallthroughproj); | |
2085 _fallthroughproj->disconnect_inputs(NULL); | |
2086 region->init_req(1, slow_ctrl); | |
2087 // region inputs are now complete | |
2088 transform_later(region); | |
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2089 _igvn.replace_node(_fallthroughproj, region); |
0 | 2090 |
2091 Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) ); | |
2092 mem_phi->init_req(1, memproj ); | |
2093 mem_phi->init_req(2, mem); | |
2094 transform_later(mem_phi); | |
708
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2095 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 2096 } |
2097 | |
2098 //------------------------------expand_macro_nodes---------------------- | |
2099 // Returns true if a failure occurred. | |
2100 bool PhaseMacroExpand::expand_macro_nodes() { | |
2101 if (C->macro_count() == 0) | |
2102 return false; | |
460
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2103 // First, attempt to eliminate locks |
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2104 bool progress = true; |
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2105 while (progress) { |
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2106 progress = false; |
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2107 for (int i = C->macro_count(); i > 0; i--) { |
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2108 Node * n = C->macro_node(i-1); |
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2109 bool success = false; |
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2110 debug_only(int old_macro_count = C->macro_count();); |
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2111 if (n->is_AbstractLock()) { |
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2112 success = eliminate_locking_node(n->as_AbstractLock()); |
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2113 } else if (n->Opcode() == Op_Opaque1 || n->Opcode() == Op_Opaque2) { |
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2114 _igvn.replace_node(n, n->in(1)); |
460
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2115 success = true; |
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2116 } |
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2117 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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2118 progress = progress || success; |
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2119 } |
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2120 } |
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2121 // Next, attempt to eliminate allocations |
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2122 progress = true; |
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2123 while (progress) { |
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2124 progress = false; |
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2125 for (int i = C->macro_count(); i > 0; i--) { |
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2126 Node * n = C->macro_node(i-1); |
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2127 bool success = false; |
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2128 debug_only(int old_macro_count = C->macro_count();); |
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2129 switch (n->class_id()) { |
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2130 case Node::Class_Allocate: |
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2131 case Node::Class_AllocateArray: |
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2132 success = eliminate_allocate_node(n->as_Allocate()); |
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2133 break; |
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2134 case Node::Class_Lock: |
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2135 case Node::Class_Unlock: |
460
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2136 assert(!n->as_AbstractLock()->is_eliminated(), "sanity"); |
73
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2137 break; |
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2138 default: |
460
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2139 assert(false, "unknown node type in macro list"); |
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2140 } |
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2141 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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2142 progress = progress || success; |
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2143 } |
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2144 } |
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2145 // Make sure expansion will not cause node limit to be exceeded. |
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2146 // Worst case is a macro node gets expanded into about 50 nodes. |
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2147 // Allow 50% more for optimization. |
0 | 2148 if (C->check_node_count(C->macro_count() * 75, "out of nodes before macro expansion" ) ) |
2149 return true; | |
73
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2150 |
0 | 2151 // expand "macro" nodes |
2152 // nodes are removed from the macro list as they are processed | |
2153 while (C->macro_count() > 0) { | |
73
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2154 int macro_count = C->macro_count(); |
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2155 Node * n = C->macro_node(macro_count-1); |
0 | 2156 assert(n->is_macro(), "only macro nodes expected here"); |
2157 if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) { | |
2158 // node is unreachable, so don't try to expand it | |
2159 C->remove_macro_node(n); | |
2160 continue; | |
2161 } | |
2162 switch (n->class_id()) { | |
2163 case Node::Class_Allocate: | |
2164 expand_allocate(n->as_Allocate()); | |
2165 break; | |
2166 case Node::Class_AllocateArray: | |
2167 expand_allocate_array(n->as_AllocateArray()); | |
2168 break; | |
2169 case Node::Class_Lock: | |
2170 expand_lock_node(n->as_Lock()); | |
2171 break; | |
2172 case Node::Class_Unlock: | |
2173 expand_unlock_node(n->as_Unlock()); | |
2174 break; | |
2175 default: | |
2176 assert(false, "unknown node type in macro list"); | |
2177 } | |
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2178 assert(C->macro_count() < macro_count, "must have deleted a node from macro list"); |
0 | 2179 if (C->failing()) return true; |
2180 } | |
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2181 |
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2182 _igvn.set_delay_transform(false); |
0 | 2183 _igvn.optimize(); |
2184 return false; | |
2185 } |