Mercurial > hg > graal-compiler
annotate src/share/vm/opto/macro.cpp @ 1751:2528b5bd749c
6980262: Memory leak when exception is thrown in static initializer
Summary: Use resource memory instead of c-heap for the exception message
Reviewed-by: phh, jmasa
author | kamg |
---|---|
date | Fri, 27 Aug 2010 15:05:28 -0400 |
parents | e5dfb3ccb88b |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2009, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
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()) { |
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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. | |
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138 _igvn.replace_node(oldcall, call); |
0 | 139 transform_later(call); |
140 | |
141 return call; | |
142 } | |
143 | |
144 void PhaseMacroExpand::extract_call_projections(CallNode *call) { | |
145 _fallthroughproj = NULL; | |
146 _fallthroughcatchproj = NULL; | |
147 _ioproj_fallthrough = NULL; | |
148 _ioproj_catchall = NULL; | |
149 _catchallcatchproj = NULL; | |
150 _memproj_fallthrough = NULL; | |
151 _memproj_catchall = NULL; | |
152 _resproj = NULL; | |
153 for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) { | |
154 ProjNode *pn = call->fast_out(i)->as_Proj(); | |
155 switch (pn->_con) { | |
156 case TypeFunc::Control: | |
157 { | |
158 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj | |
159 _fallthroughproj = pn; | |
160 DUIterator_Fast jmax, j = pn->fast_outs(jmax); | |
161 const Node *cn = pn->fast_out(j); | |
162 if (cn->is_Catch()) { | |
163 ProjNode *cpn = NULL; | |
164 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) { | |
165 cpn = cn->fast_out(k)->as_Proj(); | |
166 assert(cpn->is_CatchProj(), "must be a CatchProjNode"); | |
167 if (cpn->_con == CatchProjNode::fall_through_index) | |
168 _fallthroughcatchproj = cpn; | |
169 else { | |
170 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index."); | |
171 _catchallcatchproj = cpn; | |
172 } | |
173 } | |
174 } | |
175 break; | |
176 } | |
177 case TypeFunc::I_O: | |
178 if (pn->_is_io_use) | |
179 _ioproj_catchall = pn; | |
180 else | |
181 _ioproj_fallthrough = pn; | |
182 break; | |
183 case TypeFunc::Memory: | |
184 if (pn->_is_io_use) | |
185 _memproj_catchall = pn; | |
186 else | |
187 _memproj_fallthrough = pn; | |
188 break; | |
189 case TypeFunc::Parms: | |
190 _resproj = pn; | |
191 break; | |
192 default: | |
193 assert(false, "unexpected projection from allocation node."); | |
194 } | |
195 } | |
196 | |
197 } | |
198 | |
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199 // Eliminate a card mark sequence. p2x is a ConvP2XNode |
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200 void PhaseMacroExpand::eliminate_card_mark(Node* p2x) { |
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201 assert(p2x->Opcode() == Op_CastP2X, "ConvP2XNode required"); |
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202 if (!UseG1GC) { |
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203 // vanilla/CMS post barrier |
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204 Node *shift = p2x->unique_out(); |
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205 Node *addp = shift->unique_out(); |
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206 for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) { |
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207 Node *st = addp->last_out(j); |
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208 assert(st->is_Store(), "store required"); |
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209 _igvn.replace_node(st, st->in(MemNode::Memory)); |
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210 } |
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211 } else { |
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212 // G1 pre/post barriers |
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213 assert(p2x->outcnt() == 2, "expects 2 users: Xor and URShift nodes"); |
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214 // It could be only one user, URShift node, in Object.clone() instrinsic |
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215 // but the new allocation is passed to arraycopy stub and it could not |
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216 // be scalar replaced. So we don't check the case. |
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217 |
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218 // Remove G1 post barrier. |
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219 |
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220 // Search for CastP2X->Xor->URShift->Cmp path which |
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221 // checks if the store done to a different from the value's region. |
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222 // And replace Cmp with #0 (false) to collapse G1 post barrier. |
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223 Node* xorx = NULL; |
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224 for (DUIterator_Fast imax, i = p2x->fast_outs(imax); i < imax; i++) { |
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225 Node* u = p2x->fast_out(i); |
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226 if (u->Opcode() == Op_XorX) { |
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227 xorx = u; |
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228 break; |
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229 } |
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230 } |
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231 assert(xorx != NULL, "missing G1 post barrier"); |
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232 Node* shift = xorx->unique_out(); |
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233 Node* cmpx = shift->unique_out(); |
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234 assert(cmpx->is_Cmp() && cmpx->unique_out()->is_Bool() && |
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235 cmpx->unique_out()->as_Bool()->_test._test == BoolTest::ne, |
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236 "missing region check in G1 post barrier"); |
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237 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ)); |
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238 |
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239 // Remove G1 pre barrier. |
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240 |
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241 // Search "if (marking != 0)" check and set it to "false". |
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242 Node* this_region = p2x->in(0); |
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243 assert(this_region != NULL, ""); |
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244 // There is no G1 pre barrier if previous stored value is NULL |
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245 // (for example, after initialization). |
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246 if (this_region->is_Region() && this_region->req() == 3) { |
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247 int ind = 1; |
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248 if (!this_region->in(ind)->is_IfFalse()) { |
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249 ind = 2; |
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250 } |
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251 if (this_region->in(ind)->is_IfFalse()) { |
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252 Node* bol = this_region->in(ind)->in(0)->in(1); |
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253 assert(bol->is_Bool(), ""); |
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254 cmpx = bol->in(1); |
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255 if (bol->as_Bool()->_test._test == BoolTest::ne && |
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256 cmpx->is_Cmp() && cmpx->in(2) == intcon(0) && |
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257 cmpx->in(1)->is_Load()) { |
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258 Node* adr = cmpx->in(1)->as_Load()->in(MemNode::Address); |
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259 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + |
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260 PtrQueue::byte_offset_of_active()); |
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261 if (adr->is_AddP() && adr->in(AddPNode::Base) == top() && |
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262 adr->in(AddPNode::Address)->Opcode() == Op_ThreadLocal && |
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263 adr->in(AddPNode::Offset) == MakeConX(marking_offset)) { |
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264 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ)); |
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265 } |
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266 } |
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267 } |
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268 } |
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269 // Now CastP2X can be removed since it is used only on dead path |
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270 // which currently still alive until igvn optimize it. |
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271 assert(p2x->unique_out()->Opcode() == Op_URShiftX, ""); |
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272 _igvn.replace_node(p2x, top()); |
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273 } |
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274 } |
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275 |
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276 // Search for a memory operation for the specified memory slice. |
253
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277 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) { |
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278 Node *orig_mem = mem; |
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279 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
253
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280 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr(); |
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281 while (true) { |
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282 if (mem == alloc_mem || mem == start_mem ) { |
605 | 283 return mem; // hit one of our sentinels |
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284 } else if (mem->is_MergeMem()) { |
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285 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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286 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) { |
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287 Node *in = mem->in(0); |
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288 // we can safely skip over safepoints, calls, locks and membars because we |
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289 // already know that the object is safe to eliminate. |
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290 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) { |
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291 return in; |
253
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292 } else if (in->is_Call()) { |
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293 CallNode *call = in->as_Call(); |
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294 if (!call->may_modify(tinst, phase)) { |
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295 mem = call->in(TypeFunc::Memory); |
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296 } |
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297 mem = in->in(TypeFunc::Memory); |
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298 } else if (in->is_MemBar()) { |
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299 mem = in->in(TypeFunc::Memory); |
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300 } else { |
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301 assert(false, "unexpected projection"); |
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302 } |
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303 } else if (mem->is_Store()) { |
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304 const TypePtr* atype = mem->as_Store()->adr_type(); |
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305 int adr_idx = Compile::current()->get_alias_index(atype); |
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306 if (adr_idx == alias_idx) { |
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307 assert(atype->isa_oopptr(), "address type must be oopptr"); |
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308 int adr_offset = atype->offset(); |
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309 uint adr_iid = atype->is_oopptr()->instance_id(); |
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310 // Array elements references have the same alias_idx |
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311 // but different offset and different instance_id. |
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312 if (adr_offset == offset && adr_iid == alloc->_idx) |
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313 return mem; |
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314 } else { |
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315 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw"); |
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316 } |
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317 mem = mem->in(MemNode::Memory); |
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318 } else if (mem->is_ClearArray()) { |
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319 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) { |
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320 // Can not bypass initialization of the instance |
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321 // we are looking. |
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322 debug_only(intptr_t offset;) |
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323 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity"); |
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324 InitializeNode* init = alloc->as_Allocate()->initialization(); |
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325 // We are looking for stored value, return Initialize node |
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326 // or memory edge from Allocate node. |
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327 if (init != NULL) |
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328 return init; |
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329 else |
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330 return alloc->in(TypeFunc::Memory); // It will produce zero value (see callers). |
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331 } |
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332 // Otherwise skip it (the call updated 'mem' value). |
584 | 333 } else if (mem->Opcode() == Op_SCMemProj) { |
334 assert(mem->in(0)->is_LoadStore(), "sanity"); | |
335 const TypePtr* atype = mem->in(0)->in(MemNode::Address)->bottom_type()->is_ptr(); | |
336 int adr_idx = Compile::current()->get_alias_index(atype); | |
337 if (adr_idx == alias_idx) { | |
338 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); | |
339 return NULL; | |
340 } | |
341 mem = mem->in(0)->in(MemNode::Memory); | |
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342 } else { |
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343 return mem; |
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344 } |
247 | 345 assert(mem != orig_mem, "dead memory loop"); |
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346 } |
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347 } |
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348 |
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349 // |
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350 // Given a Memory Phi, compute a value Phi containing the values from stores |
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351 // on the input paths. |
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352 // Note: this function is recursive, its depth is limied by the "level" argument |
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353 // Returns the computed Phi, or NULL if it cannot compute it. |
247 | 354 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) { |
355 assert(mem->is_Phi(), "sanity"); | |
356 int alias_idx = C->get_alias_index(adr_t); | |
357 int offset = adr_t->offset(); | |
358 int instance_id = adr_t->instance_id(); | |
359 | |
360 // Check if an appropriate value phi already exists. | |
361 Node* region = mem->in(0); | |
362 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) { | |
363 Node* phi = region->fast_out(k); | |
364 if (phi->is_Phi() && phi != mem && | |
365 phi->as_Phi()->is_same_inst_field(phi_type, instance_id, alias_idx, offset)) { | |
366 return phi; | |
367 } | |
368 } | |
369 // Check if an appropriate new value phi already exists. | |
370 Node* new_phi = NULL; | |
371 uint size = value_phis->size(); | |
372 for (uint i=0; i < size; i++) { | |
373 if ( mem->_idx == value_phis->index_at(i) ) { | |
374 return value_phis->node_at(i); | |
375 } | |
376 } | |
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377 |
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378 if (level <= 0) { |
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379 return NULL; // Give up: phi tree too deep |
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380 } |
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381 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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382 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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383 |
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384 uint length = mem->req(); |
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385 GrowableArray <Node *> values(length, length, NULL); |
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386 |
247 | 387 // create a new Phi for the value |
388 PhiNode *phi = new (C, length) PhiNode(mem->in(0), phi_type, NULL, instance_id, alias_idx, offset); | |
389 transform_later(phi); | |
390 value_phis->push(phi, mem->_idx); | |
391 | |
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392 for (uint j = 1; j < length; j++) { |
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393 Node *in = mem->in(j); |
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394 if (in == NULL || in->is_top()) { |
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395 values.at_put(j, in); |
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396 } else { |
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397 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn); |
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398 if (val == start_mem || val == alloc_mem) { |
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399 // hit a sentinel, return appropriate 0 value |
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400 values.at_put(j, _igvn.zerocon(ft)); |
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401 continue; |
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402 } |
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403 if (val->is_Initialize()) { |
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404 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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405 } |
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406 if (val == NULL) { |
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407 return NULL; // can't find a value on this path |
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408 } |
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409 if (val == mem) { |
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410 values.at_put(j, mem); |
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411 } else if (val->is_Store()) { |
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412 values.at_put(j, val->in(MemNode::ValueIn)); |
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413 } else if(val->is_Proj() && val->in(0) == alloc) { |
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414 values.at_put(j, _igvn.zerocon(ft)); |
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415 } else if (val->is_Phi()) { |
247 | 416 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1); |
417 if (val == NULL) { | |
418 return NULL; | |
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419 } |
247 | 420 values.at_put(j, val); |
584 | 421 } else if (val->Opcode() == Op_SCMemProj) { |
422 assert(val->in(0)->is_LoadStore(), "sanity"); | |
423 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); | |
424 return NULL; | |
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425 } else { |
584 | 426 #ifdef ASSERT |
427 val->dump(); | |
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428 assert(false, "unknown node on this path"); |
584 | 429 #endif |
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430 return NULL; // unknown node on this path |
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431 } |
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432 } |
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433 } |
247 | 434 // Set Phi's inputs |
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435 for (uint j = 1; j < length; j++) { |
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436 if (values.at(j) == mem) { |
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437 phi->init_req(j, phi); |
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438 } else { |
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439 phi->init_req(j, values.at(j)); |
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440 } |
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441 } |
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442 return phi; |
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443 } |
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444 |
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445 // Search the last value stored into the object's field. |
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446 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc) { |
223 | 447 assert(adr_t->is_known_instance_field(), "instance required"); |
448 int instance_id = adr_t->instance_id(); | |
449 assert((uint)instance_id == alloc->_idx, "wrong allocation"); | |
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450 |
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451 int alias_idx = C->get_alias_index(adr_t); |
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452 int offset = adr_t->offset(); |
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453 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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454 Node *alloc_ctrl = alloc->in(TypeFunc::Control); |
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455 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
247 | 456 Arena *a = Thread::current()->resource_area(); |
457 VectorSet visited(a); | |
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458 |
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459 |
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460 bool done = sfpt_mem == alloc_mem; |
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461 Node *mem = sfpt_mem; |
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462 while (!done) { |
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463 if (visited.test_set(mem->_idx)) { |
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464 return NULL; // found a loop, give up |
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465 } |
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466 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn); |
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467 if (mem == start_mem || mem == alloc_mem) { |
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468 done = true; // hit a sentinel, return appropriate 0 value |
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469 } else if (mem->is_Initialize()) { |
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470 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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471 if (mem == NULL) { |
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472 done = true; // Something go wrong. |
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473 } else if (mem->is_Store()) { |
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474 const TypePtr* atype = mem->as_Store()->adr_type(); |
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475 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice"); |
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476 done = true; |
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477 } |
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478 } else if (mem->is_Store()) { |
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479 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr(); |
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480 assert(atype != NULL, "address type must be oopptr"); |
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481 assert(C->get_alias_index(atype) == alias_idx && |
223 | 482 atype->is_known_instance_field() && atype->offset() == offset && |
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483 atype->instance_id() == instance_id, "store is correct memory slice"); |
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484 done = true; |
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485 } else if (mem->is_Phi()) { |
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486 // try to find a phi's unique input |
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487 Node *unique_input = NULL; |
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488 Node *top = C->top(); |
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489 for (uint i = 1; i < mem->req(); i++) { |
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490 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn); |
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491 if (n == NULL || n == top || n == mem) { |
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492 continue; |
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493 } else if (unique_input == NULL) { |
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494 unique_input = n; |
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495 } else if (unique_input != n) { |
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496 unique_input = top; |
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497 break; |
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498 } |
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499 } |
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500 if (unique_input != NULL && unique_input != top) { |
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501 mem = unique_input; |
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502 } else { |
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503 done = true; |
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504 } |
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505 } else { |
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506 assert(false, "unexpected node"); |
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507 } |
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508 } |
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509 if (mem != NULL) { |
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510 if (mem == start_mem || mem == alloc_mem) { |
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511 // hit a sentinel, return appropriate 0 value |
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512 return _igvn.zerocon(ft); |
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513 } else if (mem->is_Store()) { |
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514 return mem->in(MemNode::ValueIn); |
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515 } else if (mem->is_Phi()) { |
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516 // attempt to produce a Phi reflecting the values on the input paths of the Phi |
247 | 517 Node_Stack value_phis(a, 8); |
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518 Node * phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit); |
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519 if (phi != NULL) { |
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520 return phi; |
247 | 521 } else { |
522 // Kill all new Phis | |
523 while(value_phis.is_nonempty()) { | |
524 Node* n = value_phis.node(); | |
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525 _igvn.replace_node(n, C->top()); |
247 | 526 value_phis.pop(); |
527 } | |
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528 } |
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529 } |
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530 } |
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531 // Something go wrong. |
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532 return NULL; |
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533 } |
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534 |
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535 // Check the possibility of scalar replacement. |
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536 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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537 // Scan the uses of the allocation to check for anything that would |
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538 // prevent us from eliminating it. |
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539 NOT_PRODUCT( const char* fail_eliminate = NULL; ) |
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540 DEBUG_ONLY( Node* disq_node = NULL; ) |
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541 bool can_eliminate = true; |
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542 |
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543 Node* res = alloc->result_cast(); |
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544 const TypeOopPtr* res_type = NULL; |
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545 if (res == NULL) { |
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546 // All users were eliminated. |
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547 } else if (!res->is_CheckCastPP()) { |
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548 alloc->_is_scalar_replaceable = false; // don't try again |
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549 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";) |
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550 can_eliminate = false; |
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551 } else { |
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552 res_type = _igvn.type(res)->isa_oopptr(); |
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553 if (res_type == NULL) { |
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554 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";) |
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555 can_eliminate = false; |
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556 } else if (res_type->isa_aryptr()) { |
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557 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
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558 if (length < 0) { |
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559 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";) |
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560 can_eliminate = false; |
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561 } |
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562 } |
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563 } |
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564 |
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565 if (can_eliminate && res != NULL) { |
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566 for (DUIterator_Fast jmax, j = res->fast_outs(jmax); |
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567 j < jmax && can_eliminate; j++) { |
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568 Node* use = res->fast_out(j); |
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569 |
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570 if (use->is_AddP()) { |
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571 const TypePtr* addp_type = _igvn.type(use)->is_ptr(); |
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572 int offset = addp_type->offset(); |
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573 |
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574 if (offset == Type::OffsetTop || offset == Type::OffsetBot) { |
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575 NOT_PRODUCT(fail_eliminate = "Undefined field referrence";) |
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576 can_eliminate = false; |
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577 break; |
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578 } |
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579 for (DUIterator_Fast kmax, k = use->fast_outs(kmax); |
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580 k < kmax && can_eliminate; k++) { |
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581 Node* n = use->fast_out(k); |
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582 if (!n->is_Store() && n->Opcode() != Op_CastP2X) { |
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583 DEBUG_ONLY(disq_node = n;) |
253
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6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
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584 if (n->is_Load() || n->is_LoadStore()) { |
73
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585 NOT_PRODUCT(fail_eliminate = "Field load";) |
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586 } else { |
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587 NOT_PRODUCT(fail_eliminate = "Not store field referrence";) |
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588 } |
a8880a78d355
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589 can_eliminate = false; |
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|
590 } |
a8880a78d355
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|
591 } |
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diff
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592 } else if (use->is_SafePoint()) { |
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593 SafePointNode* sfpt = use->as_SafePoint(); |
168
7793bd37a336
6705887: Compressed Oops: generate x64 addressing and implicit null checks with narrow oops
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594 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) { |
73
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595 // Object is passed as argument. |
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596 DEBUG_ONLY(disq_node = use;) |
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597 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";) |
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598 can_eliminate = false; |
a8880a78d355
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|
599 } |
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|
600 Node* sfptMem = sfpt->memory(); |
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601 if (sfptMem == NULL || sfptMem->is_top()) { |
a8880a78d355
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|
602 DEBUG_ONLY(disq_node = use;) |
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603 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";) |
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|
604 can_eliminate = false; |
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|
605 } else { |
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|
606 safepoints.append_if_missing(sfpt); |
a8880a78d355
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|
607 } |
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|
608 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark |
a8880a78d355
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609 if (use->is_Phi()) { |
a8880a78d355
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610 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) { |
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611 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
a8880a78d355
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|
612 } else { |
a8880a78d355
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|
613 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";) |
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|
614 } |
a8880a78d355
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diff
changeset
|
615 DEBUG_ONLY(disq_node = use;) |
a8880a78d355
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|
616 } else { |
a8880a78d355
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617 if (use->Opcode() == Op_Return) { |
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618 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
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619 }else { |
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620 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";) |
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|
621 } |
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diff
changeset
|
622 DEBUG_ONLY(disq_node = use;) |
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|
623 } |
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|
624 can_eliminate = false; |
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|
625 } |
a8880a78d355
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|
626 } |
a8880a78d355
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|
627 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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|
628 |
a8880a78d355
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|
629 #ifndef PRODUCT |
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630 if (PrintEliminateAllocations) { |
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|
631 if (can_eliminate) { |
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|
632 tty->print("Scalar "); |
a8880a78d355
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|
633 if (res == NULL) |
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|
634 alloc->dump(); |
a8880a78d355
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|
635 else |
a8880a78d355
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kvn
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diff
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|
636 res->dump(); |
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|
637 } else { |
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|
638 tty->print("NotScalar (%s)", fail_eliminate); |
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|
639 if (res == NULL) |
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diff
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|
640 alloc->dump(); |
a8880a78d355
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diff
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|
641 else |
a8880a78d355
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diff
changeset
|
642 res->dump(); |
a8880a78d355
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diff
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|
643 #ifdef ASSERT |
a8880a78d355
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|
644 if (disq_node != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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diff
changeset
|
645 tty->print(" >>>> "); |
a8880a78d355
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|
646 disq_node->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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|
647 } |
a8880a78d355
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|
648 #endif /*ASSERT*/ |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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|
649 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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|
650 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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|
651 #endif |
a8880a78d355
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kvn
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|
652 return can_eliminate; |
a8880a78d355
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kvn
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diff
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|
653 } |
a8880a78d355
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kvn
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diff
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|
654 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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diff
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|
655 // Do scalar replacement. |
a8880a78d355
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|
656 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
a8880a78d355
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657 GrowableArray <SafePointNode *> safepoints_done; |
a8880a78d355
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|
658 |
a8880a78d355
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diff
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|
659 ciKlass* klass = NULL; |
a8880a78d355
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66
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|
660 ciInstanceKlass* iklass = NULL; |
a8880a78d355
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|
661 int nfields = 0; |
a8880a78d355
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kvn
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66
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|
662 int array_base; |
a8880a78d355
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|
663 int element_size; |
a8880a78d355
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|
664 BasicType basic_elem_type; |
a8880a78d355
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diff
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|
665 ciType* elem_type; |
a8880a78d355
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diff
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|
666 |
a8880a78d355
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|
667 Node* res = alloc->result_cast(); |
a8880a78d355
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diff
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|
668 const TypeOopPtr* res_type = NULL; |
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diff
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|
669 if (res != NULL) { // Could be NULL when there are no users |
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670 res_type = _igvn.type(res)->isa_oopptr(); |
a8880a78d355
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|
671 } |
a8880a78d355
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kvn
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diff
changeset
|
672 |
a8880a78d355
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kvn
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|
673 if (res != NULL) { |
a8880a78d355
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|
674 klass = res_type->klass(); |
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675 if (res_type->isa_instptr()) { |
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676 // find the fields of the class which will be needed for safepoint debug information |
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677 assert(klass->is_instance_klass(), "must be an instance klass."); |
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678 iklass = klass->as_instance_klass(); |
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679 nfields = iklass->nof_nonstatic_fields(); |
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680 } else { |
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681 // find the array's elements which will be needed for safepoint debug information |
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682 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
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683 assert(klass->is_array_klass() && nfields >= 0, "must be an array klass."); |
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684 elem_type = klass->as_array_klass()->element_type(); |
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685 basic_elem_type = elem_type->basic_type(); |
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686 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type); |
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687 element_size = type2aelembytes(basic_elem_type); |
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688 } |
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689 } |
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690 // |
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691 // Process the safepoint uses |
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692 // |
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693 while (safepoints.length() > 0) { |
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694 SafePointNode* sfpt = safepoints.pop(); |
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695 Node* mem = sfpt->memory(); |
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696 uint first_ind = sfpt->req(); |
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697 SafePointScalarObjectNode* sobj = new (C, 1) SafePointScalarObjectNode(res_type, |
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698 #ifdef ASSERT |
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699 alloc, |
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700 #endif |
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701 first_ind, nfields); |
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702 sobj->init_req(0, sfpt->in(TypeFunc::Control)); |
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703 transform_later(sobj); |
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|
704 |
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705 // Scan object's fields adding an input to the safepoint for each field. |
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706 for (int j = 0; j < nfields; j++) { |
306
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707 intptr_t offset; |
73
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708 ciField* field = NULL; |
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709 if (iklass != NULL) { |
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710 field = iklass->nonstatic_field_at(j); |
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711 offset = field->offset(); |
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712 elem_type = field->type(); |
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713 basic_elem_type = field->layout_type(); |
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714 } else { |
306
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715 offset = array_base + j * (intptr_t)element_size; |
73
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716 } |
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|
717 |
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718 const Type *field_type; |
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719 // The next code is taken from Parse::do_get_xxx(). |
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720 if (basic_elem_type == T_OBJECT || basic_elem_type == T_ARRAY) { |
73
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721 if (!elem_type->is_loaded()) { |
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722 field_type = TypeInstPtr::BOTTOM; |
1682
e5dfb3ccb88b
6969569: assert(is_static() && is_constant()) failed: illegal call to constant_value()
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723 } else if (field != NULL && field->is_constant() && field->is_static()) { |
73
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724 // This can happen if the constant oop is non-perm. |
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725 ciObject* con = field->constant_value().as_object(); |
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726 // Do not "join" in the previous type; it doesn't add value, |
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727 // and may yield a vacuous result if the field is of interface type. |
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728 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); |
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729 assert(field_type != NULL, "field singleton type must be consistent"); |
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730 } else { |
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731 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass()); |
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732 } |
124
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733 if (UseCompressedOops) { |
221
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734 field_type = field_type->make_narrowoop(); |
124
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735 basic_elem_type = T_NARROWOOP; |
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736 } |
73
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737 } else { |
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738 field_type = Type::get_const_basic_type(basic_elem_type); |
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739 } |
a8880a78d355
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|
740 |
a8880a78d355
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741 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr(); |
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742 |
a8880a78d355
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743 Node *field_val = value_from_mem(mem, basic_elem_type, field_type, field_addr_type, alloc); |
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744 if (field_val == NULL) { |
a8880a78d355
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|
745 // we weren't able to find a value for this field, |
a8880a78d355
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diff
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|
746 // give up on eliminating this allocation |
a8880a78d355
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|
747 alloc->_is_scalar_replaceable = false; // don't try again |
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|
748 // remove any extra entries we added to the safepoint |
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|
749 uint last = sfpt->req() - 1; |
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|
750 for (int k = 0; k < j; k++) { |
a8880a78d355
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|
751 sfpt->del_req(last--); |
a8880a78d355
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diff
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|
752 } |
a8880a78d355
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diff
changeset
|
753 // rollback processed safepoints |
a8880a78d355
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diff
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|
754 while (safepoints_done.length() > 0) { |
a8880a78d355
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diff
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|
755 SafePointNode* sfpt_done = safepoints_done.pop(); |
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diff
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|
756 // remove any extra entries we added to the safepoint |
a8880a78d355
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66
diff
changeset
|
757 last = sfpt_done->req() - 1; |
a8880a78d355
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66
diff
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|
758 for (int k = 0; k < nfields; k++) { |
a8880a78d355
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kvn
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diff
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|
759 sfpt_done->del_req(last--); |
a8880a78d355
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diff
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|
760 } |
a8880a78d355
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|
761 JVMState *jvms = sfpt_done->jvms(); |
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|
762 jvms->set_endoff(sfpt_done->req()); |
a8880a78d355
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diff
changeset
|
763 // Now make a pass over the debug information replacing any references |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
764 // to SafePointScalarObjectNode with the allocated object. |
a8880a78d355
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kvn
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66
diff
changeset
|
765 int start = jvms->debug_start(); |
a8880a78d355
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66
diff
changeset
|
766 int end = jvms->debug_end(); |
a8880a78d355
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66
diff
changeset
|
767 for (int i = start; i < end; i++) { |
a8880a78d355
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|
768 if (sfpt_done->in(i)->is_SafePointScalarObject()) { |
a8880a78d355
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|
769 SafePointScalarObjectNode* scobj = sfpt_done->in(i)->as_SafePointScalarObject(); |
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|
770 if (scobj->first_index() == sfpt_done->req() && |
a8880a78d355
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|
771 scobj->n_fields() == (uint)nfields) { |
a8880a78d355
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|
772 assert(scobj->alloc() == alloc, "sanity"); |
a8880a78d355
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diff
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|
773 sfpt_done->set_req(i, res); |
a8880a78d355
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kvn
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66
diff
changeset
|
774 } |
a8880a78d355
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kvn
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66
diff
changeset
|
775 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
776 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
777 } |
a8880a78d355
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kvn
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66
diff
changeset
|
778 #ifndef PRODUCT |
a8880a78d355
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diff
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|
779 if (PrintEliminateAllocations) { |
a8880a78d355
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66
diff
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|
780 if (field != NULL) { |
a8880a78d355
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|
781 tty->print("=== At SafePoint node %d can't find value of Field: ", |
a8880a78d355
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diff
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|
782 sfpt->_idx); |
a8880a78d355
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kvn
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diff
changeset
|
783 field->print(); |
a8880a78d355
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diff
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|
784 int field_idx = C->get_alias_index(field_addr_type); |
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|
785 tty->print(" (alias_idx=%d)", field_idx); |
a8880a78d355
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diff
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|
786 } else { // Array's element |
a8880a78d355
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diff
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|
787 tty->print("=== At SafePoint node %d can't find value of array element [%d]", |
a8880a78d355
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66
diff
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|
788 sfpt->_idx, j); |
a8880a78d355
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kvn
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66
diff
changeset
|
789 } |
a8880a78d355
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kvn
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66
diff
changeset
|
790 tty->print(", which prevents elimination of: "); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
791 if (res == NULL) |
a8880a78d355
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kvn
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66
diff
changeset
|
792 alloc->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
793 else |
a8880a78d355
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kvn
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66
diff
changeset
|
794 res->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
795 } |
a8880a78d355
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kvn
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66
diff
changeset
|
796 #endif |
a8880a78d355
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66
diff
changeset
|
797 return false; |
a8880a78d355
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diff
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|
798 } |
124
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|
799 if (UseCompressedOops && field_type->isa_narrowoop()) { |
b130b98db9cf
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|
800 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation |
b130b98db9cf
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|
801 // to be able scalar replace the allocation. |
221
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|
802 if (field_val->is_EncodeP()) { |
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|
803 field_val = field_val->in(1); |
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|
804 } else { |
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
kvn
parents:
216
diff
changeset
|
805 field_val = transform_later(new (C, 2) DecodeNNode(field_val, field_val->bottom_type()->make_ptr())); |
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
kvn
parents:
216
diff
changeset
|
806 } |
124
b130b98db9cf
6689060: Escape Analysis does not work with Compressed Oops
kvn
parents:
113
diff
changeset
|
807 } |
73
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
808 sfpt->add_req(field_val); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
809 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
810 JVMState *jvms = sfpt->jvms(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
811 jvms->set_endoff(sfpt->req()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
812 // 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
|
813 // to the allocated object with "sobj" |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
814 int start = jvms->debug_start(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
815 int end = jvms->debug_end(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
816 for (int i = start; i < end; i++) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
817 if (sfpt->in(i) == res) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
818 sfpt->set_req(i, sobj); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
819 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
820 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
821 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
|
822 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
823 return true; |
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 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
826 // Process users of eliminated allocation. |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
827 void PhaseMacroExpand::process_users_of_allocation(AllocateNode *alloc) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
828 Node* res = alloc->result_cast(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
829 if (res != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
830 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
|
831 Node *use = res->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
832 uint oc1 = res->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
833 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
834 if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
835 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
|
836 Node *n = use->last_out(k); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
837 uint oc2 = use->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
838 if (n->is_Store()) { |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
839 #ifdef ASSERT |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
840 // 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
|
841 // 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
|
842 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
|
843 p < pmax; p++) { |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
844 Node* mb = n->fast_out(p); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
845 assert(mb->is_Initialize() || !mb->is_MemBar() || |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
846 mb->req() <= MemBarNode::Precedent || |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
847 mb->in(MemBarNode::Precedent) != n, |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
848 "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
|
849 } |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1080
diff
changeset
|
850 #endif |
73
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
851 _igvn.replace_node(n, n->in(MemNode::Memory)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
852 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
853 eliminate_card_mark(n); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
854 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
855 k -= (oc2 - use->outcnt()); |
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 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
858 eliminate_card_mark(use); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
859 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
860 j -= (oc1 - res->outcnt()); |
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 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
|
863 _igvn.remove_dead_node(res); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
864 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
865 |
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 // Process other users of allocation's projections |
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 if (_resproj != NULL && _resproj->outcnt() != 0) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
870 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
|
871 Node *use = _resproj->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
872 uint oc1 = _resproj->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
873 if (use->is_Initialize()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
874 // Eliminate Initialize node. |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
875 InitializeNode *init = use->as_Initialize(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
876 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
|
877 Node *ctrl_proj = init->proj_out(TypeFunc::Control); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
878 if (ctrl_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
879 assert(init->in(TypeFunc::Control) == _fallthroughcatchproj, "allocation control projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
880 _igvn.replace_node(ctrl_proj, _fallthroughcatchproj); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
881 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
882 Node *mem_proj = init->proj_out(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
883 if (mem_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
884 Node *mem = init->in(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
885 #ifdef ASSERT |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
886 if (mem->is_MergeMem()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
887 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
|
888 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
889 assert(mem == _memproj_fallthrough, "allocation memory projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
890 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
891 #endif |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
892 _igvn.replace_node(mem_proj, mem); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
893 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
894 } else if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
895 // 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
|
896 _igvn.replace_node(use, C->top()); |
73
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
897 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
898 assert(false, "only Initialize or AddP expected"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
899 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
900 j -= (oc1 - _resproj->outcnt()); |
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 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
903 if (_fallthroughcatchproj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
904 _igvn.replace_node(_fallthroughcatchproj, alloc->in(TypeFunc::Control)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
905 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
906 if (_memproj_fallthrough != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
907 _igvn.replace_node(_memproj_fallthrough, alloc->in(TypeFunc::Memory)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
908 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
909 if (_memproj_catchall != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
910 _igvn.replace_node(_memproj_catchall, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
911 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
912 if (_ioproj_fallthrough != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
913 _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
|
914 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
915 if (_ioproj_catchall != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
916 _igvn.replace_node(_ioproj_catchall, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
917 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
918 if (_catchallcatchproj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
919 _igvn.replace_node(_catchallcatchproj, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
920 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
921 } |
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 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) { |
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 if (!EliminateAllocations || !alloc->_is_scalar_replaceable) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
926 return false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
927 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
928 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
929 extract_call_projections(alloc); |
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 GrowableArray <SafePointNode *> safepoints; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
932 if (!can_eliminate_allocation(alloc, safepoints)) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
933 return false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
934 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
935 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
936 if (!scalar_replacement(alloc, safepoints)) { |
a8880a78d355
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937 return false; |
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938 } |
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939 |
1080
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940 CompileLog* log = C->log(); |
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941 if (log != NULL) { |
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942 Node* klass = alloc->in(AllocateNode::KlassNode); |
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943 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr(); |
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944 log->head("eliminate_allocation type='%d'", |
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945 log->identify(tklass->klass())); |
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946 JVMState* p = alloc->jvms(); |
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947 while (p != NULL) { |
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948 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); |
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949 p = p->caller(); |
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950 } |
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951 log->tail("eliminate_allocation"); |
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952 } |
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953 |
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954 process_users_of_allocation(alloc); |
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955 |
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956 #ifndef PRODUCT |
1080
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957 if (PrintEliminateAllocations) { |
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958 if (alloc->is_AllocateArray()) |
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959 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx); |
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960 else |
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961 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx); |
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962 } |
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963 #endif |
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964 |
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965 return true; |
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966 } |
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967 |
0 | 968 |
969 //---------------------------set_eden_pointers------------------------- | |
970 void PhaseMacroExpand::set_eden_pointers(Node* &eden_top_adr, Node* &eden_end_adr) { | |
971 if (UseTLAB) { // Private allocation: load from TLS | |
972 Node* thread = transform_later(new (C, 1) ThreadLocalNode()); | |
973 int tlab_top_offset = in_bytes(JavaThread::tlab_top_offset()); | |
974 int tlab_end_offset = in_bytes(JavaThread::tlab_end_offset()); | |
975 eden_top_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_top_offset); | |
976 eden_end_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_end_offset); | |
977 } else { // Shared allocation: load from globals | |
978 CollectedHeap* ch = Universe::heap(); | |
979 address top_adr = (address)ch->top_addr(); | |
980 address end_adr = (address)ch->end_addr(); | |
981 eden_top_adr = makecon(TypeRawPtr::make(top_adr)); | |
982 eden_end_adr = basic_plus_adr(eden_top_adr, end_adr - top_adr); | |
983 } | |
984 } | |
985 | |
986 | |
987 Node* PhaseMacroExpand::make_load(Node* ctl, Node* mem, Node* base, int offset, const Type* value_type, BasicType bt) { | |
988 Node* adr = basic_plus_adr(base, offset); | |
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989 const TypePtr* adr_type = adr->bottom_type()->is_ptr(); |
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990 Node* value = LoadNode::make(_igvn, ctl, mem, adr, adr_type, value_type, bt); |
0 | 991 transform_later(value); |
992 return value; | |
993 } | |
994 | |
995 | |
996 Node* PhaseMacroExpand::make_store(Node* ctl, Node* mem, Node* base, int offset, Node* value, BasicType bt) { | |
997 Node* adr = basic_plus_adr(base, offset); | |
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998 mem = StoreNode::make(_igvn, ctl, mem, adr, NULL, value, bt); |
0 | 999 transform_later(mem); |
1000 return mem; | |
1001 } | |
1002 | |
1003 //============================================================================= | |
1004 // | |
1005 // A L L O C A T I O N | |
1006 // | |
1007 // Allocation attempts to be fast in the case of frequent small objects. | |
1008 // It breaks down like this: | |
1009 // | |
1010 // 1) Size in doublewords is computed. This is a constant for objects and | |
1011 // variable for most arrays. Doubleword units are used to avoid size | |
1012 // overflow of huge doubleword arrays. We need doublewords in the end for | |
1013 // rounding. | |
1014 // | |
1015 // 2) Size is checked for being 'too large'. Too-large allocations will go | |
1016 // the slow path into the VM. The slow path can throw any required | |
1017 // exceptions, and does all the special checks for very large arrays. The | |
1018 // size test can constant-fold away for objects. For objects with | |
1019 // finalizers it constant-folds the otherway: you always go slow with | |
1020 // finalizers. | |
1021 // | |
1022 // 3) If NOT using TLABs, this is the contended loop-back point. | |
1023 // Load-Locked the heap top. If using TLABs normal-load the heap top. | |
1024 // | |
1025 // 4) Check that heap top + size*8 < max. If we fail go the slow ` route. | |
1026 // NOTE: "top+size*8" cannot wrap the 4Gig line! Here's why: for largish | |
1027 // "size*8" we always enter the VM, where "largish" is a constant picked small | |
1028 // enough that there's always space between the eden max and 4Gig (old space is | |
1029 // there so it's quite large) and large enough that the cost of entering the VM | |
1030 // is dwarfed by the cost to initialize the space. | |
1031 // | |
1032 // 5) If NOT using TLABs, Store-Conditional the adjusted heap top back | |
1033 // down. If contended, repeat at step 3. If using TLABs normal-store | |
1034 // adjusted heap top back down; there is no contention. | |
1035 // | |
1036 // 6) If !ZeroTLAB then Bulk-clear the object/array. Fill in klass & mark | |
1037 // fields. | |
1038 // | |
1039 // 7) Merge with the slow-path; cast the raw memory pointer to the correct | |
1040 // oop flavor. | |
1041 // | |
1042 //============================================================================= | |
1043 // FastAllocateSizeLimit value is in DOUBLEWORDS. | |
1044 // Allocations bigger than this always go the slow route. | |
1045 // This value must be small enough that allocation attempts that need to | |
1046 // trigger exceptions go the slow route. Also, it must be small enough so | |
1047 // that heap_top + size_in_bytes does not wrap around the 4Gig limit. | |
1048 //=============================================================================j// | |
1049 // %%% Here is an old comment from parseHelper.cpp; is it outdated? | |
1050 // The allocator will coalesce int->oop copies away. See comment in | |
1051 // coalesce.cpp about how this works. It depends critically on the exact | |
1052 // code shape produced here, so if you are changing this code shape | |
1053 // make sure the GC info for the heap-top is correct in and around the | |
1054 // slow-path call. | |
1055 // | |
1056 | |
1057 void PhaseMacroExpand::expand_allocate_common( | |
1058 AllocateNode* alloc, // allocation node to be expanded | |
1059 Node* length, // array length for an array allocation | |
1060 const TypeFunc* slow_call_type, // Type of slow call | |
1061 address slow_call_address // Address of slow call | |
1062 ) | |
1063 { | |
1064 | |
1065 Node* ctrl = alloc->in(TypeFunc::Control); | |
1066 Node* mem = alloc->in(TypeFunc::Memory); | |
1067 Node* i_o = alloc->in(TypeFunc::I_O); | |
1068 Node* size_in_bytes = alloc->in(AllocateNode::AllocSize); | |
1069 Node* klass_node = alloc->in(AllocateNode::KlassNode); | |
1070 Node* initial_slow_test = alloc->in(AllocateNode::InitialTest); | |
1071 | |
1072 assert(ctrl != NULL, "must have control"); | |
1073 // We need a Region and corresponding Phi's to merge the slow-path and fast-path results. | |
1074 // they will not be used if "always_slow" is set | |
1075 enum { slow_result_path = 1, fast_result_path = 2 }; | |
1076 Node *result_region; | |
1077 Node *result_phi_rawmem; | |
1078 Node *result_phi_rawoop; | |
1079 Node *result_phi_i_o; | |
1080 | |
1081 // The initial slow comparison is a size check, the comparison | |
1082 // we want to do is a BoolTest::gt | |
1083 bool always_slow = false; | |
1084 int tv = _igvn.find_int_con(initial_slow_test, -1); | |
1085 if (tv >= 0) { | |
1086 always_slow = (tv == 1); | |
1087 initial_slow_test = NULL; | |
1088 } else { | |
1089 initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn); | |
1090 } | |
1091 | |
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1092 if (C->env()->dtrace_alloc_probes() || |
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1093 !UseTLAB && (!Universe::heap()->supports_inline_contig_alloc() || |
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1094 (UseConcMarkSweepGC && CMSIncrementalMode))) { |
0 | 1095 // Force slow-path allocation |
1096 always_slow = true; | |
1097 initial_slow_test = NULL; | |
1098 } | |
1099 | |
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1100 |
0 | 1101 enum { too_big_or_final_path = 1, need_gc_path = 2 }; |
1102 Node *slow_region = NULL; | |
1103 Node *toobig_false = ctrl; | |
1104 | |
1105 assert (initial_slow_test == NULL || !always_slow, "arguments must be consistent"); | |
1106 // generate the initial test if necessary | |
1107 if (initial_slow_test != NULL ) { | |
1108 slow_region = new (C, 3) RegionNode(3); | |
1109 | |
1110 // Now make the initial failure test. Usually a too-big test but | |
1111 // might be a TRUE for finalizers or a fancy class check for | |
1112 // newInstance0. | |
1113 IfNode *toobig_iff = new (C, 2) IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN); | |
1114 transform_later(toobig_iff); | |
1115 // Plug the failing-too-big test into the slow-path region | |
1116 Node *toobig_true = new (C, 1) IfTrueNode( toobig_iff ); | |
1117 transform_later(toobig_true); | |
1118 slow_region ->init_req( too_big_or_final_path, toobig_true ); | |
1119 toobig_false = new (C, 1) IfFalseNode( toobig_iff ); | |
1120 transform_later(toobig_false); | |
1121 } else { // No initial test, just fall into next case | |
1122 toobig_false = ctrl; | |
1123 debug_only(slow_region = NodeSentinel); | |
1124 } | |
1125 | |
1126 Node *slow_mem = mem; // save the current memory state for slow path | |
1127 // generate the fast allocation code unless we know that the initial test will always go slow | |
1128 if (!always_slow) { | |
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1129 // Fast path modifies only raw memory. |
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1130 if (mem->is_MergeMem()) { |
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1131 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw); |
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1132 } |
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1133 |
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1134 Node* eden_top_adr; |
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1135 Node* eden_end_adr; |
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1136 |
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1137 set_eden_pointers(eden_top_adr, eden_end_adr); |
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1138 |
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1139 // Load Eden::end. Loop invariant and hoisted. |
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1140 // |
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1141 // Note: We set the control input on "eden_end" and "old_eden_top" when using |
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1142 // a TLAB to work around a bug where these values were being moved across |
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1143 // a safepoint. These are not oops, so they cannot be include in the oop |
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1144 // map, but the can be changed by a GC. The proper way to fix this would |
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1145 // be to set the raw memory state when generating a SafepointNode. However |
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1146 // this will require extensive changes to the loop optimization in order to |
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1147 // prevent a degradation of the optimization. |
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1148 // See comment in memnode.hpp, around line 227 in class LoadPNode. |
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1149 Node *eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS); |
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1150 |
0 | 1151 // allocate the Region and Phi nodes for the result |
1152 result_region = new (C, 3) RegionNode(3); | |
1153 result_phi_rawmem = new (C, 3) PhiNode( result_region, Type::MEMORY, TypeRawPtr::BOTTOM ); | |
1154 result_phi_rawoop = new (C, 3) PhiNode( result_region, TypeRawPtr::BOTTOM ); | |
1155 result_phi_i_o = new (C, 3) PhiNode( result_region, Type::ABIO ); // I/O is used for Prefetch | |
1156 | |
1157 // We need a Region for the loop-back contended case. | |
1158 enum { fall_in_path = 1, contended_loopback_path = 2 }; | |
1159 Node *contended_region; | |
1160 Node *contended_phi_rawmem; | |
1161 if( UseTLAB ) { | |
1162 contended_region = toobig_false; | |
1163 contended_phi_rawmem = mem; | |
1164 } else { | |
1165 contended_region = new (C, 3) RegionNode(3); | |
1166 contended_phi_rawmem = new (C, 3) PhiNode( contended_region, Type::MEMORY, TypeRawPtr::BOTTOM); | |
1167 // Now handle the passing-too-big test. We fall into the contended | |
1168 // loop-back merge point. | |
1169 contended_region ->init_req( fall_in_path, toobig_false ); | |
1170 contended_phi_rawmem->init_req( fall_in_path, mem ); | |
1171 transform_later(contended_region); | |
1172 transform_later(contended_phi_rawmem); | |
1173 } | |
1174 | |
1175 // Load(-locked) the heap top. | |
1176 // See note above concerning the control input when using a TLAB | |
1177 Node *old_eden_top = UseTLAB | |
1178 ? new (C, 3) LoadPNode ( ctrl, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ) | |
1179 : new (C, 3) LoadPLockedNode( contended_region, contended_phi_rawmem, eden_top_adr ); | |
1180 | |
1181 transform_later(old_eden_top); | |
1182 // Add to heap top to get a new heap top | |
1183 Node *new_eden_top = new (C, 4) AddPNode( top(), old_eden_top, size_in_bytes ); | |
1184 transform_later(new_eden_top); | |
1185 // Check for needing a GC; compare against heap end | |
1186 Node *needgc_cmp = new (C, 3) CmpPNode( new_eden_top, eden_end ); | |
1187 transform_later(needgc_cmp); | |
1188 Node *needgc_bol = new (C, 2) BoolNode( needgc_cmp, BoolTest::ge ); | |
1189 transform_later(needgc_bol); | |
1190 IfNode *needgc_iff = new (C, 2) IfNode(contended_region, needgc_bol, PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); | |
1191 transform_later(needgc_iff); | |
1192 | |
1193 // Plug the failing-heap-space-need-gc test into the slow-path region | |
1194 Node *needgc_true = new (C, 1) IfTrueNode( needgc_iff ); | |
1195 transform_later(needgc_true); | |
1196 if( initial_slow_test ) { | |
1197 slow_region ->init_req( need_gc_path, needgc_true ); | |
1198 // This completes all paths into the slow merge point | |
1199 transform_later(slow_region); | |
1200 } else { // No initial slow path needed! | |
1201 // Just fall from the need-GC path straight into the VM call. | |
1202 slow_region = needgc_true; | |
1203 } | |
1204 // No need for a GC. Setup for the Store-Conditional | |
1205 Node *needgc_false = new (C, 1) IfFalseNode( needgc_iff ); | |
1206 transform_later(needgc_false); | |
1207 | |
1208 // Grab regular I/O before optional prefetch may change it. | |
1209 // Slow-path does no I/O so just set it to the original I/O. | |
1210 result_phi_i_o->init_req( slow_result_path, i_o ); | |
1211 | |
1212 i_o = prefetch_allocation(i_o, needgc_false, contended_phi_rawmem, | |
1213 old_eden_top, new_eden_top, length); | |
1214 | |
1215 // Store (-conditional) the modified eden top back down. | |
1216 // StorePConditional produces flags for a test PLUS a modified raw | |
1217 // memory state. | |
1218 Node *store_eden_top; | |
1219 Node *fast_oop_ctrl; | |
1220 if( UseTLAB ) { | |
1221 store_eden_top = new (C, 4) StorePNode( needgc_false, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, new_eden_top ); | |
1222 transform_later(store_eden_top); | |
1223 fast_oop_ctrl = needgc_false; // No contention, so this is the fast path | |
1224 } else { | |
1225 store_eden_top = new (C, 5) StorePConditionalNode( needgc_false, contended_phi_rawmem, eden_top_adr, new_eden_top, old_eden_top ); | |
1226 transform_later(store_eden_top); | |
1227 Node *contention_check = new (C, 2) BoolNode( store_eden_top, BoolTest::ne ); | |
1228 transform_later(contention_check); | |
1229 store_eden_top = new (C, 1) SCMemProjNode(store_eden_top); | |
1230 transform_later(store_eden_top); | |
1231 | |
1232 // If not using TLABs, check to see if there was contention. | |
1233 IfNode *contention_iff = new (C, 2) IfNode ( needgc_false, contention_check, PROB_MIN, COUNT_UNKNOWN ); | |
1234 transform_later(contention_iff); | |
1235 Node *contention_true = new (C, 1) IfTrueNode( contention_iff ); | |
1236 transform_later(contention_true); | |
1237 // If contention, loopback and try again. | |
1238 contended_region->init_req( contended_loopback_path, contention_true ); | |
1239 contended_phi_rawmem->init_req( contended_loopback_path, store_eden_top ); | |
1240 | |
1241 // Fast-path succeeded with no contention! | |
1242 Node *contention_false = new (C, 1) IfFalseNode( contention_iff ); | |
1243 transform_later(contention_false); | |
1244 fast_oop_ctrl = contention_false; | |
1245 } | |
1246 | |
1247 // Rename successful fast-path variables to make meaning more obvious | |
1248 Node* fast_oop = old_eden_top; | |
1249 Node* fast_oop_rawmem = store_eden_top; | |
1250 fast_oop_rawmem = initialize_object(alloc, | |
1251 fast_oop_ctrl, fast_oop_rawmem, fast_oop, | |
1252 klass_node, length, size_in_bytes); | |
1253 | |
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1254 if (C->env()->dtrace_extended_probes()) { |
0 | 1255 // Slow-path call |
1256 int size = TypeFunc::Parms + 2; | |
1257 CallLeafNode *call = new (C, size) CallLeafNode(OptoRuntime::dtrace_object_alloc_Type(), | |
1258 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc_base), | |
1259 "dtrace_object_alloc", | |
1260 TypeRawPtr::BOTTOM); | |
1261 | |
1262 // Get base of thread-local storage area | |
1263 Node* thread = new (C, 1) ThreadLocalNode(); | |
1264 transform_later(thread); | |
1265 | |
1266 call->init_req(TypeFunc::Parms+0, thread); | |
1267 call->init_req(TypeFunc::Parms+1, fast_oop); | |
1268 call->init_req( TypeFunc::Control, fast_oop_ctrl ); | |
1269 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1270 call->init_req( TypeFunc::Memory , fast_oop_rawmem ); | |
1271 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1272 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1273 transform_later(call); | |
1274 fast_oop_ctrl = new (C, 1) ProjNode(call,TypeFunc::Control); | |
1275 transform_later(fast_oop_ctrl); | |
1276 fast_oop_rawmem = new (C, 1) ProjNode(call,TypeFunc::Memory); | |
1277 transform_later(fast_oop_rawmem); | |
1278 } | |
1279 | |
1280 // Plug in the successful fast-path into the result merge point | |
1281 result_region ->init_req( fast_result_path, fast_oop_ctrl ); | |
1282 result_phi_rawoop->init_req( fast_result_path, fast_oop ); | |
1283 result_phi_i_o ->init_req( fast_result_path, i_o ); | |
1284 result_phi_rawmem->init_req( fast_result_path, fast_oop_rawmem ); | |
1285 } else { | |
1286 slow_region = ctrl; | |
1287 } | |
1288 | |
1289 // Generate slow-path call | |
1290 CallNode *call = new (C, slow_call_type->domain()->cnt()) | |
1291 CallStaticJavaNode(slow_call_type, slow_call_address, | |
1292 OptoRuntime::stub_name(slow_call_address), | |
1293 alloc->jvms()->bci(), | |
1294 TypePtr::BOTTOM); | |
1295 call->init_req( TypeFunc::Control, slow_region ); | |
1296 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1297 call->init_req( TypeFunc::Memory , slow_mem ); // may gc ptrs | |
1298 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1299 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1300 | |
1301 call->init_req(TypeFunc::Parms+0, klass_node); | |
1302 if (length != NULL) { | |
1303 call->init_req(TypeFunc::Parms+1, length); | |
1304 } | |
1305 | |
1306 // Copy debug information and adjust JVMState information, then replace | |
1307 // allocate node with the call | |
1308 copy_call_debug_info((CallNode *) alloc, call); | |
1309 if (!always_slow) { | |
1310 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
1311 } | |
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1312 _igvn.replace_node(alloc, call); |
0 | 1313 transform_later(call); |
1314 | |
1315 // Identify the output projections from the allocate node and | |
1316 // adjust any references to them. | |
1317 // The control and io projections look like: | |
1318 // | |
1319 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl) | |
1320 // Allocate Catch | |
1321 // ^---Proj(io) <-------+ ^---CatchProj(io) | |
1322 // | |
1323 // We are interested in the CatchProj nodes. | |
1324 // | |
1325 extract_call_projections(call); | |
1326 | |
1327 // An allocate node has separate memory projections for the uses on the control and i_o paths | |
1328 // Replace uses of the control memory projection with result_phi_rawmem (unless we are only generating a slow call) | |
1329 if (!always_slow && _memproj_fallthrough != NULL) { | |
1330 for (DUIterator_Fast imax, i = _memproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1331 Node *use = _memproj_fallthrough->fast_out(i); | |
1332 _igvn.hash_delete(use); | |
1333 imax -= replace_input(use, _memproj_fallthrough, result_phi_rawmem); | |
1334 _igvn._worklist.push(use); | |
1335 // back up iterator | |
1336 --i; | |
1337 } | |
1338 } | |
1339 // Now change uses of _memproj_catchall to use _memproj_fallthrough and delete _memproj_catchall so | |
1340 // we end up with a call that has only 1 memory projection | |
1341 if (_memproj_catchall != NULL ) { | |
1342 if (_memproj_fallthrough == NULL) { | |
1343 _memproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::Memory); | |
1344 transform_later(_memproj_fallthrough); | |
1345 } | |
1346 for (DUIterator_Fast imax, i = _memproj_catchall->fast_outs(imax); i < imax; i++) { | |
1347 Node *use = _memproj_catchall->fast_out(i); | |
1348 _igvn.hash_delete(use); | |
1349 imax -= replace_input(use, _memproj_catchall, _memproj_fallthrough); | |
1350 _igvn._worklist.push(use); | |
1351 // back up iterator | |
1352 --i; | |
1353 } | |
1354 } | |
1355 | |
1356 // An allocate node has separate i_o projections for the uses on the control and i_o paths | |
1357 // Replace uses of the control i_o projection with result_phi_i_o (unless we are only generating a slow call) | |
1358 if (_ioproj_fallthrough == NULL) { | |
1359 _ioproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::I_O); | |
1360 transform_later(_ioproj_fallthrough); | |
1361 } else if (!always_slow) { | |
1362 for (DUIterator_Fast imax, i = _ioproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1363 Node *use = _ioproj_fallthrough->fast_out(i); | |
1364 | |
1365 _igvn.hash_delete(use); | |
1366 imax -= replace_input(use, _ioproj_fallthrough, result_phi_i_o); | |
1367 _igvn._worklist.push(use); | |
1368 // back up iterator | |
1369 --i; | |
1370 } | |
1371 } | |
1372 // Now change uses of _ioproj_catchall to use _ioproj_fallthrough and delete _ioproj_catchall so | |
1373 // we end up with a call that has only 1 control projection | |
1374 if (_ioproj_catchall != NULL ) { | |
1375 for (DUIterator_Fast imax, i = _ioproj_catchall->fast_outs(imax); i < imax; i++) { | |
1376 Node *use = _ioproj_catchall->fast_out(i); | |
1377 _igvn.hash_delete(use); | |
1378 imax -= replace_input(use, _ioproj_catchall, _ioproj_fallthrough); | |
1379 _igvn._worklist.push(use); | |
1380 // back up iterator | |
1381 --i; | |
1382 } | |
1383 } | |
1384 | |
1385 // if we generated only a slow call, we are done | |
1386 if (always_slow) | |
1387 return; | |
1388 | |
1389 | |
1390 if (_fallthroughcatchproj != NULL) { | |
1391 ctrl = _fallthroughcatchproj->clone(); | |
1392 transform_later(ctrl); | |
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1393 _igvn.replace_node(_fallthroughcatchproj, result_region); |
0 | 1394 } else { |
1395 ctrl = top(); | |
1396 } | |
1397 Node *slow_result; | |
1398 if (_resproj == NULL) { | |
1399 // no uses of the allocation result | |
1400 slow_result = top(); | |
1401 } else { | |
1402 slow_result = _resproj->clone(); | |
1403 transform_later(slow_result); | |
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1404 _igvn.replace_node(_resproj, result_phi_rawoop); |
0 | 1405 } |
1406 | |
1407 // Plug slow-path into result merge point | |
1408 result_region ->init_req( slow_result_path, ctrl ); | |
1409 result_phi_rawoop->init_req( slow_result_path, slow_result); | |
1410 result_phi_rawmem->init_req( slow_result_path, _memproj_fallthrough ); | |
1411 transform_later(result_region); | |
1412 transform_later(result_phi_rawoop); | |
1413 transform_later(result_phi_rawmem); | |
1414 transform_later(result_phi_i_o); | |
1415 // This completes all paths into the result merge point | |
1416 } | |
1417 | |
1418 | |
1419 // Helper for PhaseMacroExpand::expand_allocate_common. | |
1420 // Initializes the newly-allocated storage. | |
1421 Node* | |
1422 PhaseMacroExpand::initialize_object(AllocateNode* alloc, | |
1423 Node* control, Node* rawmem, Node* object, | |
1424 Node* klass_node, Node* length, | |
1425 Node* size_in_bytes) { | |
1426 InitializeNode* init = alloc->initialization(); | |
1427 // Store the klass & mark bits | |
1428 Node* mark_node = NULL; | |
1429 // For now only enable fast locking for non-array types | |
1430 if (UseBiasedLocking && (length == NULL)) { | |
1609 | 1431 mark_node = make_load(control, rawmem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeRawPtr::BOTTOM, T_ADDRESS); |
0 | 1432 } else { |
1433 mark_node = makecon(TypeRawPtr::make((address)markOopDesc::prototype())); | |
1434 } | |
1435 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS); | |
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1436 |
0 | 1437 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_OBJECT); |
1438 int header_size = alloc->minimum_header_size(); // conservatively small | |
1439 | |
1440 // Array length | |
1441 if (length != NULL) { // Arrays need length field | |
1442 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT); | |
1443 // conservatively small header size: | |
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1444 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE); |
0 | 1445 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass(); |
1446 if (k->is_array_klass()) // we know the exact header size in most cases: | |
1447 header_size = Klass::layout_helper_header_size(k->layout_helper()); | |
1448 } | |
1449 | |
1450 // Clear the object body, if necessary. | |
1451 if (init == NULL) { | |
1452 // The init has somehow disappeared; be cautious and clear everything. | |
1453 // | |
1454 // This can happen if a node is allocated but an uncommon trap occurs | |
1455 // immediately. In this case, the Initialize gets associated with the | |
1456 // trap, and may be placed in a different (outer) loop, if the Allocate | |
1457 // is in a loop. If (this is rare) the inner loop gets unrolled, then | |
1458 // there can be two Allocates to one Initialize. The answer in all these | |
1459 // edge cases is safety first. It is always safe to clear immediately | |
1460 // within an Allocate, and then (maybe or maybe not) clear some more later. | |
1461 if (!ZeroTLAB) | |
1462 rawmem = ClearArrayNode::clear_memory(control, rawmem, object, | |
1463 header_size, size_in_bytes, | |
1464 &_igvn); | |
1465 } else { | |
1466 if (!init->is_complete()) { | |
1467 // Try to win by zeroing only what the init does not store. | |
1468 // We can also try to do some peephole optimizations, | |
1469 // such as combining some adjacent subword stores. | |
1470 rawmem = init->complete_stores(control, rawmem, object, | |
1471 header_size, size_in_bytes, &_igvn); | |
1472 } | |
1473 // We have no more use for this link, since the AllocateNode goes away: | |
1474 init->set_req(InitializeNode::RawAddress, top()); | |
1475 // (If we keep the link, it just confuses the register allocator, | |
1476 // who thinks he sees a real use of the address by the membar.) | |
1477 } | |
1478 | |
1479 return rawmem; | |
1480 } | |
1481 | |
1482 // Generate prefetch instructions for next allocations. | |
1483 Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false, | |
1484 Node*& contended_phi_rawmem, | |
1485 Node* old_eden_top, Node* new_eden_top, | |
1486 Node* length) { | |
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1487 enum { fall_in_path = 1, pf_path = 2 }; |
0 | 1488 if( UseTLAB && AllocatePrefetchStyle == 2 ) { |
1489 // Generate prefetch allocation with watermark check. | |
1490 // As an allocation hits the watermark, we will prefetch starting | |
1491 // at a "distance" away from watermark. | |
1492 | |
1493 Node *pf_region = new (C, 3) RegionNode(3); | |
1494 Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY, | |
1495 TypeRawPtr::BOTTOM ); | |
1496 // I/O is used for Prefetch | |
1497 Node *pf_phi_abio = new (C, 3) PhiNode( pf_region, Type::ABIO ); | |
1498 | |
1499 Node *thread = new (C, 1) ThreadLocalNode(); | |
1500 transform_later(thread); | |
1501 | |
1502 Node *eden_pf_adr = new (C, 4) AddPNode( top()/*not oop*/, thread, | |
1503 _igvn.MakeConX(in_bytes(JavaThread::tlab_pf_top_offset())) ); | |
1504 transform_later(eden_pf_adr); | |
1505 | |
1506 Node *old_pf_wm = new (C, 3) LoadPNode( needgc_false, | |
1507 contended_phi_rawmem, eden_pf_adr, | |
1508 TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); | |
1509 transform_later(old_pf_wm); | |
1510 | |
1511 // check against new_eden_top | |
1512 Node *need_pf_cmp = new (C, 3) CmpPNode( new_eden_top, old_pf_wm ); | |
1513 transform_later(need_pf_cmp); | |
1514 Node *need_pf_bol = new (C, 2) BoolNode( need_pf_cmp, BoolTest::ge ); | |
1515 transform_later(need_pf_bol); | |
1516 IfNode *need_pf_iff = new (C, 2) IfNode( needgc_false, need_pf_bol, | |
1517 PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); | |
1518 transform_later(need_pf_iff); | |
1519 | |
1520 // true node, add prefetchdistance | |
1521 Node *need_pf_true = new (C, 1) IfTrueNode( need_pf_iff ); | |
1522 transform_later(need_pf_true); | |
1523 | |
1524 Node *need_pf_false = new (C, 1) IfFalseNode( need_pf_iff ); | |
1525 transform_later(need_pf_false); | |
1526 | |
1527 Node *new_pf_wmt = new (C, 4) AddPNode( top(), old_pf_wm, | |
1528 _igvn.MakeConX(AllocatePrefetchDistance) ); | |
1529 transform_later(new_pf_wmt ); | |
1530 new_pf_wmt->set_req(0, need_pf_true); | |
1531 | |
1532 Node *store_new_wmt = new (C, 4) StorePNode( need_pf_true, | |
1533 contended_phi_rawmem, eden_pf_adr, | |
1534 TypeRawPtr::BOTTOM, new_pf_wmt ); | |
1535 transform_later(store_new_wmt); | |
1536 | |
1537 // adding prefetches | |
1538 pf_phi_abio->init_req( fall_in_path, i_o ); | |
1539 | |
1540 Node *prefetch_adr; | |
1541 Node *prefetch; | |
1542 uint lines = AllocatePrefetchDistance / AllocatePrefetchStepSize; | |
1543 uint step_size = AllocatePrefetchStepSize; | |
1544 uint distance = 0; | |
1545 | |
1546 for ( uint i = 0; i < lines; i++ ) { | |
1547 prefetch_adr = new (C, 4) AddPNode( old_pf_wm, new_pf_wmt, | |
1548 _igvn.MakeConX(distance) ); | |
1549 transform_later(prefetch_adr); | |
1550 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1551 transform_later(prefetch); | |
1552 distance += step_size; | |
1553 i_o = prefetch; | |
1554 } | |
1555 pf_phi_abio->set_req( pf_path, i_o ); | |
1556 | |
1557 pf_region->init_req( fall_in_path, need_pf_false ); | |
1558 pf_region->init_req( pf_path, need_pf_true ); | |
1559 | |
1560 pf_phi_rawmem->init_req( fall_in_path, contended_phi_rawmem ); | |
1561 pf_phi_rawmem->init_req( pf_path, store_new_wmt ); | |
1562 | |
1563 transform_later(pf_region); | |
1564 transform_later(pf_phi_rawmem); | |
1565 transform_later(pf_phi_abio); | |
1566 | |
1567 needgc_false = pf_region; | |
1568 contended_phi_rawmem = pf_phi_rawmem; | |
1569 i_o = pf_phi_abio; | |
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1570 } else if( UseTLAB && AllocatePrefetchStyle == 3 ) { |
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1571 // Insert a prefetch for each allocation only on the fast-path |
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1572 Node *pf_region = new (C, 3) RegionNode(3); |
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1573 Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY, |
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1574 TypeRawPtr::BOTTOM ); |
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1575 |
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1576 // Generate several prefetch instructions only for arrays. |
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1577 uint lines = (length != NULL) ? AllocatePrefetchLines : 1; |
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1578 uint step_size = AllocatePrefetchStepSize; |
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1579 uint distance = AllocatePrefetchDistance; |
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1580 |
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1581 // Next cache address. |
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1582 Node *cache_adr = new (C, 4) AddPNode(old_eden_top, old_eden_top, |
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1583 _igvn.MakeConX(distance)); |
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1584 transform_later(cache_adr); |
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1585 cache_adr = new (C, 2) CastP2XNode(needgc_false, cache_adr); |
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1586 transform_later(cache_adr); |
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1587 Node* mask = _igvn.MakeConX(~(intptr_t)(step_size-1)); |
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1588 cache_adr = new (C, 3) AndXNode(cache_adr, mask); |
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1589 transform_later(cache_adr); |
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1590 cache_adr = new (C, 2) CastX2PNode(cache_adr); |
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1591 transform_later(cache_adr); |
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1592 |
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1593 // Prefetch |
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1594 Node *prefetch = new (C, 3) PrefetchWriteNode( contended_phi_rawmem, cache_adr ); |
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1595 prefetch->set_req(0, needgc_false); |
9e321dcfa5b7
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|
1596 transform_later(prefetch); |
9e321dcfa5b7
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changeset
|
1597 contended_phi_rawmem = prefetch; |
9e321dcfa5b7
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diff
changeset
|
1598 Node *prefetch_adr; |
9e321dcfa5b7
6940726: Use BIS instruction for allocation prefetch on Sparc
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diff
changeset
|
1599 distance = step_size; |
9e321dcfa5b7
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changeset
|
1600 for ( uint i = 1; i < lines; i++ ) { |
9e321dcfa5b7
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changeset
|
1601 prefetch_adr = new (C, 4) AddPNode( cache_adr, cache_adr, |
9e321dcfa5b7
6940726: Use BIS instruction for allocation prefetch on Sparc
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diff
changeset
|
1602 _igvn.MakeConX(distance) ); |
9e321dcfa5b7
6940726: Use BIS instruction for allocation prefetch on Sparc
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diff
changeset
|
1603 transform_later(prefetch_adr); |
9e321dcfa5b7
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|
1604 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
|
1605 transform_later(prefetch); |
9e321dcfa5b7
6940726: Use BIS instruction for allocation prefetch on Sparc
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diff
changeset
|
1606 distance += step_size; |
9e321dcfa5b7
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diff
changeset
|
1607 contended_phi_rawmem = prefetch; |
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|
1608 } |
0 | 1609 } else if( AllocatePrefetchStyle > 0 ) { |
1610 // Insert a prefetch for each allocation only on the fast-path | |
1611 Node *prefetch_adr; | |
1612 Node *prefetch; | |
1613 // Generate several prefetch instructions only for arrays. | |
1614 uint lines = (length != NULL) ? AllocatePrefetchLines : 1; | |
1615 uint step_size = AllocatePrefetchStepSize; | |
1616 uint distance = AllocatePrefetchDistance; | |
1617 for ( uint i = 0; i < lines; i++ ) { | |
1618 prefetch_adr = new (C, 4) AddPNode( old_eden_top, new_eden_top, | |
1619 _igvn.MakeConX(distance) ); | |
1620 transform_later(prefetch_adr); | |
1621 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1622 // Do not let it float too high, since if eden_top == eden_end, | |
1623 // both might be null. | |
1624 if( i == 0 ) { // Set control for first prefetch, next follows it | |
1625 prefetch->init_req(0, needgc_false); | |
1626 } | |
1627 transform_later(prefetch); | |
1628 distance += step_size; | |
1629 i_o = prefetch; | |
1630 } | |
1631 } | |
1632 return i_o; | |
1633 } | |
1634 | |
1635 | |
1636 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) { | |
1637 expand_allocate_common(alloc, NULL, | |
1638 OptoRuntime::new_instance_Type(), | |
1639 OptoRuntime::new_instance_Java()); | |
1640 } | |
1641 | |
1642 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) { | |
1643 Node* length = alloc->in(AllocateNode::ALength); | |
1644 expand_allocate_common(alloc, length, | |
1645 OptoRuntime::new_array_Type(), | |
1646 OptoRuntime::new_array_Java()); | |
1647 } | |
1648 | |
1649 | |
1650 // we have determined that this lock/unlock can be eliminated, we simply | |
1651 // eliminate the node without expanding it. | |
1652 // | |
1653 // Note: The membar's associated with the lock/unlock are currently not | |
1654 // eliminated. This should be investigated as a future enhancement. | |
1655 // | |
66
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1656 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) { |
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|
1657 |
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1658 if (!alock->is_eliminated()) { |
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|
1659 return false; |
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|
1660 } |
460
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|
1661 if (alock->is_Lock() && !alock->is_coarsened()) { |
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|
1662 // Create new "eliminated" BoxLock node and use it |
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|
1663 // in monitor debug info for the same object. |
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|
1664 BoxLockNode* oldbox = alock->box_node()->as_BoxLock(); |
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|
1665 Node* obj = alock->obj_node(); |
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|
1666 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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|
1667 BoxLockNode* newbox = oldbox->clone()->as_BoxLock(); |
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|
1668 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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|
1669 transform_later(newbox); |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1670 // Replace old box node with new box for all users |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1671 // of the same object. |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1672 for (uint i = 0; i < oldbox->outcnt();) { |
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|
1673 |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1674 bool next_edge = true; |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1675 Node* u = oldbox->raw_out(i); |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1676 if (u == alock) { |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1677 i++; |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1678 continue; // It will be removed below |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1679 } |
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|
1680 if (u->is_Lock() && |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1681 u->as_Lock()->obj_node() == obj && |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1682 // oldbox could be referenced in debug info also |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1683 u->as_Lock()->box_node() == oldbox) { |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1684 assert(u->as_Lock()->is_eliminated(), "sanity"); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1685 _igvn.hash_delete(u); |
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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|
1686 u->set_req(TypeFunc::Parms + 1, newbox); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
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diff
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|
1687 next_edge = false; |
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
|
1688 #ifdef ASSERT |
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 } else if (u->is_Unlock() && u->as_Unlock()->obj_node() == obj) { |
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
|
1690 assert(u->as_Unlock()->is_eliminated(), "sanity"); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1691 #endif |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1692 } |
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
|
1693 // Replace old box in monitor debug info. |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
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|
1694 if (u->is_SafePoint() && u->as_SafePoint()->jvms()) { |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
changeset
|
1695 SafePointNode* sfn = u->as_SafePoint(); |
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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|
1696 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
changeset
|
1697 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
|
1698 for (int depth = 1; depth <= max_depth; depth++) { |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
changeset
|
1699 JVMState* jvms = youngest_jvms->of_depth(depth); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
changeset
|
1700 int num_mon = jvms->nof_monitors(); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
changeset
|
1701 // Loop over monitors |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
changeset
|
1702 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:
436
diff
changeset
|
1703 Node* obj_node = sfn->monitor_obj(jvms, idx); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
changeset
|
1704 Node* box_node = sfn->monitor_box(jvms, idx); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
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diff
changeset
|
1705 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
|
1706 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
changeset
|
1707 _igvn.hash_delete(u); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
changeset
|
1708 u->set_req(j, newbox); |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
changeset
|
1709 next_edge = false; |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
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|
1710 } |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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diff
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|
1711 } // for (int idx = 0; |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
kvn
parents:
436
diff
changeset
|
1712 } // for (int depth = 1; |
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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|
1713 } // if (u->is_SafePoint() |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1714 if (next_edge) i++; |
424f9bfe6b96
6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1715 } // for (uint i = 0; i < oldbox->outcnt();) |
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6775880: EA +DeoptimizeALot: assert(mon_info->owner()->is_locked(),"object must be locked now")
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|
1716 } // 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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|
1717 } // if (alock->is_Lock() && !lock->is_coarsened()) |
66
6dbf1a175d6b
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|
1718 |
1080
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1719 CompileLog* log = C->log(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1720 if (log != NULL) { |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1721 log->head("eliminate_lock lock='%d'", |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1722 alock->is_Lock()); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1723 JVMState* p = alock->jvms(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1724 while (p != NULL) { |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1725 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
|
1726 p = p->caller(); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1727 } |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1728 log->tail("eliminate_lock"); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1729 } |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
851
diff
changeset
|
1730 |
66
6dbf1a175d6b
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|
1731 #ifndef PRODUCT |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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63
diff
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|
1732 if (PrintEliminateLocks) { |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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63
diff
changeset
|
1733 if (alock->is_Lock()) { |
6dbf1a175d6b
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diff
changeset
|
1734 tty->print_cr("++++ Eliminating: %d Lock", alock->_idx); |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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|
1735 } else { |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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changeset
|
1736 tty->print_cr("++++ Eliminating: %d Unlock", alock->_idx); |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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|
1737 } |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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parents:
63
diff
changeset
|
1738 } |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
changeset
|
1739 #endif |
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changeset
|
1740 |
6dbf1a175d6b
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parents:
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changeset
|
1741 Node* mem = alock->in(TypeFunc::Memory); |
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6672848: (Escape Analysis) improve lock elimination with EA
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|
1742 Node* ctrl = alock->in(TypeFunc::Control); |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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parents:
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diff
changeset
|
1743 |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
kvn
parents:
63
diff
changeset
|
1744 extract_call_projections(alock); |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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parents:
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diff
changeset
|
1745 // There are 2 projections from the lock. The lock node will |
6dbf1a175d6b
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1746 // be deleted when its last use is subsumed below. |
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1747 assert(alock->outcnt() == 2 && |
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|
1748 _fallthroughproj != NULL && |
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|
1749 _memproj_fallthrough != NULL, |
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|
1750 "Unexpected projections from Lock/Unlock"); |
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|
1751 |
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1752 Node* fallthroughproj = _fallthroughproj; |
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1753 Node* memproj_fallthrough = _memproj_fallthrough; |
0 | 1754 |
1755 // The memory projection from a lock/unlock is RawMem | |
1756 // The input to a Lock is merged memory, so extract its RawMem input | |
1757 // (unless the MergeMem has been optimized away.) | |
1758 if (alock->is_Lock()) { | |
66
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1759 // Seach for MemBarAcquire node and delete it also. |
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1760 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar(); |
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1761 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquire, ""); |
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1762 Node* ctrlproj = membar->proj_out(TypeFunc::Control); |
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1763 Node* memproj = membar->proj_out(TypeFunc::Memory); |
708
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1764 _igvn.replace_node(ctrlproj, fallthroughproj); |
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1765 _igvn.replace_node(memproj, memproj_fallthrough); |
460
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1766 |
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1767 // Delete FastLock node also if this Lock node is unique user |
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1768 // (a loop peeling may clone a Lock node). |
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1769 Node* flock = alock->as_Lock()->fastlock_node(); |
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|
1770 if (flock->outcnt() == 1) { |
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|
1771 assert(flock->unique_out() == alock, "sanity"); |
708
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|
1772 _igvn.replace_node(flock, top()); |
460
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|
1773 } |
0 | 1774 } |
1775 | |
66
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1776 // Seach for MemBarRelease node and delete it also. |
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1777 if (alock->is_Unlock() && ctrl != NULL && ctrl->is_Proj() && |
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1778 ctrl->in(0)->is_MemBar()) { |
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|
1779 MemBarNode* membar = ctrl->in(0)->as_MemBar(); |
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1780 assert(membar->Opcode() == Op_MemBarRelease && |
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1781 mem->is_Proj() && membar == mem->in(0), ""); |
708
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1782 _igvn.replace_node(fallthroughproj, ctrl); |
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1783 _igvn.replace_node(memproj_fallthrough, mem); |
66
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1784 fallthroughproj = ctrl; |
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|
1785 memproj_fallthrough = mem; |
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|
1786 ctrl = membar->in(TypeFunc::Control); |
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1787 mem = membar->in(TypeFunc::Memory); |
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|
1788 } |
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1789 |
708
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1790 _igvn.replace_node(fallthroughproj, ctrl); |
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1791 _igvn.replace_node(memproj_fallthrough, mem); |
66
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1792 return true; |
0 | 1793 } |
1794 | |
1795 | |
1796 //------------------------------expand_lock_node---------------------- | |
1797 void PhaseMacroExpand::expand_lock_node(LockNode *lock) { | |
1798 | |
1799 Node* ctrl = lock->in(TypeFunc::Control); | |
1800 Node* mem = lock->in(TypeFunc::Memory); | |
1801 Node* obj = lock->obj_node(); | |
1802 Node* box = lock->box_node(); | |
66
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1803 Node* flock = lock->fastlock_node(); |
0 | 1804 |
1805 // Make the merge point | |
420
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1806 Node *region; |
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1807 Node *mem_phi; |
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|
1808 Node *slow_path; |
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|
1809 |
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1810 if (UseOptoBiasInlining) { |
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1811 /* |
605 | 1812 * See the full description in MacroAssembler::biased_locking_enter(). |
420
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1813 * |
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1814 * if( (mark_word & biased_lock_mask) == biased_lock_pattern ) { |
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1815 * // The object is biased. |
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1816 * proto_node = klass->prototype_header; |
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1817 * o_node = thread | proto_node; |
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1818 * x_node = o_node ^ mark_word; |
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1819 * if( (x_node & ~age_mask) == 0 ) { // Biased to the current thread ? |
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1820 * // Done. |
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1821 * } else { |
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1822 * if( (x_node & biased_lock_mask) != 0 ) { |
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1823 * // The klass's prototype header is no longer biased. |
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1824 * cas(&mark_word, mark_word, proto_node) |
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|
1825 * goto cas_lock; |
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|
1826 * } else { |
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|
1827 * // The klass's prototype header is still biased. |
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|
1828 * if( (x_node & epoch_mask) != 0 ) { // Expired epoch? |
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|
1829 * old = mark_word; |
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|
1830 * new = o_node; |
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|
1831 * } else { |
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|
1832 * // Different thread or anonymous biased. |
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1833 * old = mark_word & (epoch_mask | age_mask | biased_lock_mask); |
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|
1834 * new = thread | old; |
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|
1835 * } |
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|
1836 * // Try to rebias. |
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1837 * if( cas(&mark_word, old, new) == 0 ) { |
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|
1838 * // Done. |
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|
1839 * } else { |
a1980da045cc
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|
1840 * goto slow_path; // Failed. |
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6462850: generate biased locking code in C2 ideal graph
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|
1841 * } |
a1980da045cc
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|
1842 * } |
a1980da045cc
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|
1843 * } |
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|
1844 * } else { |
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|
1845 * // The object is not biased. |
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|
1846 * cas_lock: |
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|
1847 * if( FastLock(obj) == 0 ) { |
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diff
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|
1848 * // Done. |
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|
1849 * } else { |
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|
1850 * slow_path: |
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|
1851 * OptoRuntime::complete_monitor_locking_Java(obj); |
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|
1852 * } |
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|
1853 * } |
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|
1854 */ |
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|
1855 |
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|
1856 region = new (C, 5) RegionNode(5); |
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|
1857 // create a Phi for the memory state |
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|
1858 mem_phi = new (C, 5) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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|
1859 |
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|
1860 Node* fast_lock_region = new (C, 3) RegionNode(3); |
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|
1861 Node* fast_lock_mem_phi = new (C, 3) PhiNode( fast_lock_region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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|
1862 |
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1863 // First, check mark word for the biased lock pattern. |
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1864 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
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|
1865 |
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1866 // Get fast path - mark word has the biased lock pattern. |
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1867 ctrl = opt_bits_test(ctrl, fast_lock_region, 1, mark_node, |
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|
1868 markOopDesc::biased_lock_mask_in_place, |
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|
1869 markOopDesc::biased_lock_pattern, true); |
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1870 // fast_lock_region->in(1) is set to slow path. |
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|
1871 fast_lock_mem_phi->init_req(1, mem); |
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|
1872 |
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1873 // Now check that the lock is biased to the current thread and has |
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1874 // the same epoch and bias as Klass::_prototype_header. |
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1875 |
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1876 // Special-case a fresh allocation to avoid building nodes: |
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1877 Node* klass_node = AllocateNode::Ideal_klass(obj, &_igvn); |
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1878 if (klass_node == NULL) { |
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1879 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); |
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1880 klass_node = transform_later( LoadKlassNode::make(_igvn, mem, k_adr, _igvn.type(k_adr)->is_ptr()) ); |
490
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|
1881 #ifdef _LP64 |
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1882 if (UseCompressedOops && klass_node->is_DecodeN()) { |
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|
1883 assert(klass_node->in(1)->Opcode() == Op_LoadNKlass, "sanity"); |
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|
1884 klass_node->in(1)->init_req(0, ctrl); |
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|
1885 } else |
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|
1886 #endif |
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|
1887 klass_node->init_req(0, ctrl); |
420
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|
1888 } |
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1889 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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1890 |
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1891 Node* thread = transform_later(new (C, 1) ThreadLocalNode()); |
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1892 Node* cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread)); |
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1893 Node* o_node = transform_later(new (C, 3) OrXNode(cast_thread, proto_node)); |
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1894 Node* x_node = transform_later(new (C, 3) XorXNode(o_node, mark_node)); |
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1895 |
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1896 // Get slow path - mark word does NOT match the value. |
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1897 Node* not_biased_ctrl = opt_bits_test(ctrl, region, 3, x_node, |
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1898 (~markOopDesc::age_mask_in_place), 0); |
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1899 // region->in(3) is set to fast path - the object is biased to the current thread. |
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1900 mem_phi->init_req(3, mem); |
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1901 |
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1902 |
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1903 // Mark word does NOT match the value (thread | Klass::_prototype_header). |
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1904 |
0 | 1905 |
420
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1906 // First, check biased pattern. |
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1907 // Get fast path - _prototype_header has the same biased lock pattern. |
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1908 ctrl = opt_bits_test(not_biased_ctrl, fast_lock_region, 2, x_node, |
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1909 markOopDesc::biased_lock_mask_in_place, 0, true); |
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1910 |
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1911 not_biased_ctrl = fast_lock_region->in(2); // Slow path |
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1912 // fast_lock_region->in(2) - the prototype header is no longer biased |
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1913 // and we have to revoke the bias on this object. |
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1914 // We are going to try to reset the mark of this object to the prototype |
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1915 // value and fall through to the CAS-based locking scheme. |
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1916 Node* adr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes()); |
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1917 Node* cas = new (C, 5) StoreXConditionalNode(not_biased_ctrl, mem, adr, |
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1918 proto_node, mark_node); |
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1919 transform_later(cas); |
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1920 Node* proj = transform_later( new (C, 1) SCMemProjNode(cas)); |
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1921 fast_lock_mem_phi->init_req(2, proj); |
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1922 |
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1923 |
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1924 // Second, check epoch bits. |
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1925 Node* rebiased_region = new (C, 3) RegionNode(3); |
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1926 Node* old_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X); |
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1927 Node* new_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X); |
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1928 |
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1929 // Get slow path - mark word does NOT match epoch bits. |
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1930 Node* epoch_ctrl = opt_bits_test(ctrl, rebiased_region, 1, x_node, |
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1931 markOopDesc::epoch_mask_in_place, 0); |
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1932 // The epoch of the current bias is not valid, attempt to rebias the object |
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1933 // toward the current thread. |
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1934 rebiased_region->init_req(2, epoch_ctrl); |
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1935 old_phi->init_req(2, mark_node); |
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1936 new_phi->init_req(2, o_node); |
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1937 |
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1938 // rebiased_region->in(1) is set to fast path. |
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1939 // The epoch of the current bias is still valid but we know |
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1940 // nothing about the owner; it might be set or it might be clear. |
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1941 Node* cmask = MakeConX(markOopDesc::biased_lock_mask_in_place | |
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1942 markOopDesc::age_mask_in_place | |
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1943 markOopDesc::epoch_mask_in_place); |
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1944 Node* old = transform_later(new (C, 3) AndXNode(mark_node, cmask)); |
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1945 cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread)); |
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1946 Node* new_mark = transform_later(new (C, 3) OrXNode(cast_thread, old)); |
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1947 old_phi->init_req(1, old); |
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1948 new_phi->init_req(1, new_mark); |
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1949 |
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1950 transform_later(rebiased_region); |
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1951 transform_later(old_phi); |
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1952 transform_later(new_phi); |
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1953 |
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1954 // Try to acquire the bias of the object using an atomic operation. |
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1955 // If this fails we will go in to the runtime to revoke the object's bias. |
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1956 cas = new (C, 5) StoreXConditionalNode(rebiased_region, mem, adr, |
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1957 new_phi, old_phi); |
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1958 transform_later(cas); |
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1959 proj = transform_later( new (C, 1) SCMemProjNode(cas)); |
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1960 |
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1961 // Get slow path - Failed to CAS. |
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1962 not_biased_ctrl = opt_bits_test(rebiased_region, region, 4, cas, 0, 0); |
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1963 mem_phi->init_req(4, proj); |
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1964 // region->in(4) is set to fast path - the object is rebiased to the current thread. |
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1965 |
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1966 // Failed to CAS. |
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1967 slow_path = new (C, 3) RegionNode(3); |
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1968 Node *slow_mem = new (C, 3) PhiNode( slow_path, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1969 |
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1970 slow_path->init_req(1, not_biased_ctrl); // Capture slow-control |
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1971 slow_mem->init_req(1, proj); |
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1972 |
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1973 // Call CAS-based locking scheme (FastLock node). |
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1974 |
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1975 transform_later(fast_lock_region); |
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1976 transform_later(fast_lock_mem_phi); |
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1977 |
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1978 // Get slow path - FastLock failed to lock the object. |
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1979 ctrl = opt_bits_test(fast_lock_region, region, 2, flock, 0, 0); |
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1980 mem_phi->init_req(2, fast_lock_mem_phi); |
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1981 // region->in(2) is set to fast path - the object is locked to the current thread. |
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1982 |
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1983 slow_path->init_req(2, ctrl); // Capture slow-control |
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1984 slow_mem->init_req(2, fast_lock_mem_phi); |
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1985 |
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1986 transform_later(slow_path); |
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1987 transform_later(slow_mem); |
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1988 // Reset lock's memory edge. |
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1989 lock->set_req(TypeFunc::Memory, slow_mem); |
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1990 |
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1991 } else { |
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1992 region = new (C, 3) RegionNode(3); |
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1993 // create a Phi for the memory state |
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1994 mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1995 |
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1996 // Optimize test; set region slot 2 |
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1997 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0); |
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1998 mem_phi->init_req(2, mem); |
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1999 } |
0 | 2000 |
2001 // Make slow path call | |
2002 CallNode *call = make_slow_call( (CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(), OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path, obj, box ); | |
2003 | |
2004 extract_call_projections(call); | |
2005 | |
2006 // Slow path can only throw asynchronous exceptions, which are always | |
2007 // de-opted. So the compiler thinks the slow-call can never throw an | |
2008 // exception. If it DOES throw an exception we would need the debug | |
2009 // info removed first (since if it throws there is no monitor). | |
2010 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
2011 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
2012 | |
2013 // Capture slow path | |
2014 // disconnect fall-through projection from call and create a new one | |
2015 // hook up users of fall-through projection to region | |
2016 Node *slow_ctrl = _fallthroughproj->clone(); | |
2017 transform_later(slow_ctrl); | |
2018 _igvn.hash_delete(_fallthroughproj); | |
2019 _fallthroughproj->disconnect_inputs(NULL); | |
2020 region->init_req(1, slow_ctrl); | |
2021 // region inputs are now complete | |
2022 transform_later(region); | |
708
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2023 _igvn.replace_node(_fallthroughproj, region); |
0 | 2024 |
420
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2025 Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) ); |
0 | 2026 mem_phi->init_req(1, memproj ); |
2027 transform_later(mem_phi); | |
708
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2028 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 2029 } |
2030 | |
2031 //------------------------------expand_unlock_node---------------------- | |
2032 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) { | |
2033 | |
66
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2034 Node* ctrl = unlock->in(TypeFunc::Control); |
0 | 2035 Node* mem = unlock->in(TypeFunc::Memory); |
2036 Node* obj = unlock->obj_node(); | |
2037 Node* box = unlock->box_node(); | |
2038 | |
2039 // No need for a null check on unlock | |
2040 | |
2041 // Make the merge point | |
420
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2042 Node *region; |
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2043 Node *mem_phi; |
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2044 |
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2045 if (UseOptoBiasInlining) { |
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2046 // Check for biased locking unlock case, which is a no-op. |
605 | 2047 // See the full description in MacroAssembler::biased_locking_exit(). |
420
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2048 region = new (C, 4) RegionNode(4); |
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2049 // create a Phi for the memory state |
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2050 mem_phi = new (C, 4) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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2051 mem_phi->init_req(3, mem); |
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2052 |
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2053 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
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2054 ctrl = opt_bits_test(ctrl, region, 3, mark_node, |
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2055 markOopDesc::biased_lock_mask_in_place, |
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2056 markOopDesc::biased_lock_pattern); |
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2057 } else { |
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2058 region = new (C, 3) RegionNode(3); |
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2059 // create a Phi for the memory state |
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2060 mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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2061 } |
0 | 2062 |
2063 FastUnlockNode *funlock = new (C, 3) FastUnlockNode( ctrl, obj, box ); | |
2064 funlock = transform_later( funlock )->as_FastUnlock(); | |
2065 // Optimize test; set region slot 2 | |
420
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2066 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0); |
0 | 2067 |
2068 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 ); | |
2069 | |
2070 extract_call_projections(call); | |
2071 | |
2072 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
2073 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
2074 | |
2075 // No exceptions for unlocking | |
2076 // Capture slow path | |
2077 // disconnect fall-through projection from call and create a new one | |
2078 // hook up users of fall-through projection to region | |
2079 Node *slow_ctrl = _fallthroughproj->clone(); | |
2080 transform_later(slow_ctrl); | |
2081 _igvn.hash_delete(_fallthroughproj); | |
2082 _fallthroughproj->disconnect_inputs(NULL); | |
2083 region->init_req(1, slow_ctrl); | |
2084 // region inputs are now complete | |
2085 transform_later(region); | |
708
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2086 _igvn.replace_node(_fallthroughproj, region); |
0 | 2087 |
2088 Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) ); | |
2089 mem_phi->init_req(1, memproj ); | |
2090 mem_phi->init_req(2, mem); | |
2091 transform_later(mem_phi); | |
708
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2092 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 2093 } |
2094 | |
2095 //------------------------------expand_macro_nodes---------------------- | |
2096 // Returns true if a failure occurred. | |
2097 bool PhaseMacroExpand::expand_macro_nodes() { | |
2098 if (C->macro_count() == 0) | |
2099 return false; | |
460
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2100 // First, attempt to eliminate locks |
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2101 bool progress = true; |
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2102 while (progress) { |
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2103 progress = false; |
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2104 for (int i = C->macro_count(); i > 0; i--) { |
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2105 Node * n = C->macro_node(i-1); |
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2106 bool success = false; |
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2107 debug_only(int old_macro_count = C->macro_count();); |
460
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2108 if (n->is_AbstractLock()) { |
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2109 success = eliminate_locking_node(n->as_AbstractLock()); |
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2110 } else if (n->Opcode() == Op_Opaque1 || n->Opcode() == Op_Opaque2) { |
708
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2111 _igvn.replace_node(n, n->in(1)); |
460
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2112 success = true; |
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2113 } |
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2114 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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2115 progress = progress || success; |
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2116 } |
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2117 } |
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2118 // Next, attempt to eliminate allocations |
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2119 progress = true; |
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2120 while (progress) { |
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2121 progress = false; |
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2122 for (int i = C->macro_count(); i > 0; i--) { |
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2123 Node * n = C->macro_node(i-1); |
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2124 bool success = false; |
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2125 debug_only(int old_macro_count = C->macro_count();); |
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2126 switch (n->class_id()) { |
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2127 case Node::Class_Allocate: |
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2128 case Node::Class_AllocateArray: |
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2129 success = eliminate_allocate_node(n->as_Allocate()); |
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2130 break; |
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2131 case Node::Class_Lock: |
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2132 case Node::Class_Unlock: |
460
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2133 assert(!n->as_AbstractLock()->is_eliminated(), "sanity"); |
73
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2134 break; |
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2135 default: |
460
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2136 assert(false, "unknown node type in macro list"); |
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2137 } |
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2138 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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2139 progress = progress || success; |
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2140 } |
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2141 } |
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2142 // Make sure expansion will not cause node limit to be exceeded. |
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2143 // Worst case is a macro node gets expanded into about 50 nodes. |
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2144 // Allow 50% more for optimization. |
0 | 2145 if (C->check_node_count(C->macro_count() * 75, "out of nodes before macro expansion" ) ) |
2146 return true; | |
73
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2147 |
0 | 2148 // expand "macro" nodes |
2149 // nodes are removed from the macro list as they are processed | |
2150 while (C->macro_count() > 0) { | |
73
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2151 int macro_count = C->macro_count(); |
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2152 Node * n = C->macro_node(macro_count-1); |
0 | 2153 assert(n->is_macro(), "only macro nodes expected here"); |
2154 if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) { | |
2155 // node is unreachable, so don't try to expand it | |
2156 C->remove_macro_node(n); | |
2157 continue; | |
2158 } | |
2159 switch (n->class_id()) { | |
2160 case Node::Class_Allocate: | |
2161 expand_allocate(n->as_Allocate()); | |
2162 break; | |
2163 case Node::Class_AllocateArray: | |
2164 expand_allocate_array(n->as_AllocateArray()); | |
2165 break; | |
2166 case Node::Class_Lock: | |
2167 expand_lock_node(n->as_Lock()); | |
2168 break; | |
2169 case Node::Class_Unlock: | |
2170 expand_unlock_node(n->as_Unlock()); | |
2171 break; | |
2172 default: | |
2173 assert(false, "unknown node type in macro list"); | |
2174 } | |
73
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2175 assert(C->macro_count() < macro_count, "must have deleted a node from macro list"); |
0 | 2176 if (C->failing()) return true; |
2177 } | |
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2178 |
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2179 _igvn.set_delay_transform(false); |
0 | 2180 _igvn.optimize(); |
2181 return false; | |
2182 } |