Mercurial > hg > truffle
annotate src/share/vm/opto/macro.cpp @ 747:b803b1b9e206
6819098: G1: reduce RSet scanning times
Summary: Added a feedback-driven exponential skipping for parallel RSet scanning.
Reviewed-by: tonyp, apetrusenko
author | iveresov |
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date | Mon, 27 Apr 2009 16:52:18 -0700 |
parents | f2049ae95c3d |
children | c96bf21b756f |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 2005-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_macro.cpp.incl" | |
27 | |
28 | |
29 // | |
30 // Replace any references to "oldref" in inputs to "use" with "newref". | |
31 // Returns the number of replacements made. | |
32 // | |
33 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) { | |
34 int nreplacements = 0; | |
35 uint req = use->req(); | |
36 for (uint j = 0; j < use->len(); j++) { | |
37 Node *uin = use->in(j); | |
38 if (uin == oldref) { | |
39 if (j < req) | |
40 use->set_req(j, newref); | |
41 else | |
42 use->set_prec(j, newref); | |
43 nreplacements++; | |
44 } else if (j >= req && uin == NULL) { | |
45 break; | |
46 } | |
47 } | |
48 return nreplacements; | |
49 } | |
50 | |
51 void PhaseMacroExpand::copy_call_debug_info(CallNode *oldcall, CallNode * newcall) { | |
52 // Copy debug information and adjust JVMState information | |
53 uint old_dbg_start = oldcall->tf()->domain()->cnt(); | |
54 uint new_dbg_start = newcall->tf()->domain()->cnt(); | |
55 int jvms_adj = new_dbg_start - old_dbg_start; | |
56 assert (new_dbg_start == newcall->req(), "argument count mismatch"); | |
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57 |
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58 Dict* sosn_map = new Dict(cmpkey,hashkey); |
0 | 59 for (uint i = old_dbg_start; i < oldcall->req(); i++) { |
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60 Node* old_in = oldcall->in(i); |
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61 // Clone old SafePointScalarObjectNodes, adjusting their field contents. |
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62 if (old_in != NULL && old_in->is_SafePointScalarObject()) { |
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63 SafePointScalarObjectNode* old_sosn = old_in->as_SafePointScalarObject(); |
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64 uint old_unique = C->unique(); |
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65 Node* new_in = old_sosn->clone(jvms_adj, sosn_map); |
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66 if (old_unique != C->unique()) { |
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67 new_in->set_req(0, newcall->in(0)); // reset control edge |
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68 new_in = transform_later(new_in); // Register new node. |
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69 } |
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70 old_in = new_in; |
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71 } |
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72 newcall->add_req(old_in); |
0 | 73 } |
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74 |
0 | 75 newcall->set_jvms(oldcall->jvms()); |
76 for (JVMState *jvms = newcall->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
77 jvms->set_map(newcall); | |
78 jvms->set_locoff(jvms->locoff()+jvms_adj); | |
79 jvms->set_stkoff(jvms->stkoff()+jvms_adj); | |
80 jvms->set_monoff(jvms->monoff()+jvms_adj); | |
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81 jvms->set_scloff(jvms->scloff()+jvms_adj); |
0 | 82 jvms->set_endoff(jvms->endoff()+jvms_adj); |
83 } | |
84 } | |
85 | |
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86 Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word, int mask, int bits, bool return_fast_path) { |
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87 Node* cmp; |
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88 if (mask != 0) { |
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89 Node* and_node = transform_later(new (C, 3) AndXNode(word, MakeConX(mask))); |
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90 cmp = transform_later(new (C, 3) CmpXNode(and_node, MakeConX(bits))); |
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91 } else { |
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92 cmp = word; |
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93 } |
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94 Node* bol = transform_later(new (C, 2) BoolNode(cmp, BoolTest::ne)); |
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95 IfNode* iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN ); |
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96 transform_later(iff); |
0 | 97 |
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98 // Fast path taken. |
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99 Node *fast_taken = transform_later( new (C, 1) IfFalseNode(iff) ); |
0 | 100 |
101 // Fast path not-taken, i.e. slow path | |
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102 Node *slow_taken = transform_later( new (C, 1) IfTrueNode(iff) ); |
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103 |
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104 if (return_fast_path) { |
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105 region->init_req(edge, slow_taken); // Capture slow-control |
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106 return fast_taken; |
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107 } else { |
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108 region->init_req(edge, fast_taken); // Capture fast-control |
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109 return slow_taken; |
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110 } |
0 | 111 } |
112 | |
113 //--------------------copy_predefined_input_for_runtime_call-------------------- | |
114 void PhaseMacroExpand::copy_predefined_input_for_runtime_call(Node * ctrl, CallNode* oldcall, CallNode* call) { | |
115 // Set fixed predefined input arguments | |
116 call->init_req( TypeFunc::Control, ctrl ); | |
117 call->init_req( TypeFunc::I_O , oldcall->in( TypeFunc::I_O) ); | |
118 call->init_req( TypeFunc::Memory , oldcall->in( TypeFunc::Memory ) ); // ????? | |
119 call->init_req( TypeFunc::ReturnAdr, oldcall->in( TypeFunc::ReturnAdr ) ); | |
120 call->init_req( TypeFunc::FramePtr, oldcall->in( TypeFunc::FramePtr ) ); | |
121 } | |
122 | |
123 //------------------------------make_slow_call--------------------------------- | |
124 CallNode* PhaseMacroExpand::make_slow_call(CallNode *oldcall, const TypeFunc* slow_call_type, address slow_call, const char* leaf_name, Node* slow_path, Node* parm0, Node* parm1) { | |
125 | |
126 // Slow-path call | |
127 int size = slow_call_type->domain()->cnt(); | |
128 CallNode *call = leaf_name | |
129 ? (CallNode*)new (C, size) CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM ) | |
130 : (CallNode*)new (C, size) CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), oldcall->jvms()->bci(), TypeRawPtr::BOTTOM ); | |
131 | |
132 // Slow path call has no side-effects, uses few values | |
133 copy_predefined_input_for_runtime_call(slow_path, oldcall, call ); | |
134 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0); | |
135 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1); | |
136 copy_call_debug_info(oldcall, call); | |
137 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
138 _igvn.hash_delete(oldcall); | |
139 _igvn.subsume_node(oldcall, call); | |
140 transform_later(call); | |
141 | |
142 return call; | |
143 } | |
144 | |
145 void PhaseMacroExpand::extract_call_projections(CallNode *call) { | |
146 _fallthroughproj = NULL; | |
147 _fallthroughcatchproj = NULL; | |
148 _ioproj_fallthrough = NULL; | |
149 _ioproj_catchall = NULL; | |
150 _catchallcatchproj = NULL; | |
151 _memproj_fallthrough = NULL; | |
152 _memproj_catchall = NULL; | |
153 _resproj = NULL; | |
154 for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) { | |
155 ProjNode *pn = call->fast_out(i)->as_Proj(); | |
156 switch (pn->_con) { | |
157 case TypeFunc::Control: | |
158 { | |
159 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj | |
160 _fallthroughproj = pn; | |
161 DUIterator_Fast jmax, j = pn->fast_outs(jmax); | |
162 const Node *cn = pn->fast_out(j); | |
163 if (cn->is_Catch()) { | |
164 ProjNode *cpn = NULL; | |
165 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) { | |
166 cpn = cn->fast_out(k)->as_Proj(); | |
167 assert(cpn->is_CatchProj(), "must be a CatchProjNode"); | |
168 if (cpn->_con == CatchProjNode::fall_through_index) | |
169 _fallthroughcatchproj = cpn; | |
170 else { | |
171 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index."); | |
172 _catchallcatchproj = cpn; | |
173 } | |
174 } | |
175 } | |
176 break; | |
177 } | |
178 case TypeFunc::I_O: | |
179 if (pn->_is_io_use) | |
180 _ioproj_catchall = pn; | |
181 else | |
182 _ioproj_fallthrough = pn; | |
183 break; | |
184 case TypeFunc::Memory: | |
185 if (pn->_is_io_use) | |
186 _memproj_catchall = pn; | |
187 else | |
188 _memproj_fallthrough = pn; | |
189 break; | |
190 case TypeFunc::Parms: | |
191 _resproj = pn; | |
192 break; | |
193 default: | |
194 assert(false, "unexpected projection from allocation node."); | |
195 } | |
196 } | |
197 | |
198 } | |
199 | |
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200 // Eliminate a card mark sequence. p2x is a ConvP2XNode |
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201 void PhaseMacroExpand::eliminate_card_mark(Node *p2x) { |
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202 assert(p2x->Opcode() == Op_CastP2X, "ConvP2XNode required"); |
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203 Node *shift = p2x->unique_out(); |
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204 Node *addp = shift->unique_out(); |
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205 for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) { |
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206 Node *st = addp->last_out(j); |
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207 assert(st->is_Store(), "store required"); |
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208 _igvn.replace_node(st, st->in(MemNode::Memory)); |
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209 } |
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210 } |
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211 |
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212 // Search for a memory operation for the specified memory slice. |
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213 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) { |
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214 Node *orig_mem = mem; |
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215 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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216 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr(); |
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217 while (true) { |
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218 if (mem == alloc_mem || mem == start_mem ) { |
605 | 219 return mem; // hit one of our sentinels |
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220 } else if (mem->is_MergeMem()) { |
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221 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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222 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) { |
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223 Node *in = mem->in(0); |
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224 // we can safely skip over safepoints, calls, locks and membars because we |
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225 // already know that the object is safe to eliminate. |
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226 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) { |
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227 return in; |
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228 } else if (in->is_Call()) { |
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229 CallNode *call = in->as_Call(); |
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230 if (!call->may_modify(tinst, phase)) { |
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231 mem = call->in(TypeFunc::Memory); |
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232 } |
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233 mem = in->in(TypeFunc::Memory); |
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234 } else if (in->is_MemBar()) { |
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235 mem = in->in(TypeFunc::Memory); |
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236 } else { |
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237 assert(false, "unexpected projection"); |
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238 } |
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239 } else if (mem->is_Store()) { |
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240 const TypePtr* atype = mem->as_Store()->adr_type(); |
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241 int adr_idx = Compile::current()->get_alias_index(atype); |
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242 if (adr_idx == alias_idx) { |
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243 assert(atype->isa_oopptr(), "address type must be oopptr"); |
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244 int adr_offset = atype->offset(); |
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245 uint adr_iid = atype->is_oopptr()->instance_id(); |
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246 // Array elements references have the same alias_idx |
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247 // but different offset and different instance_id. |
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248 if (adr_offset == offset && adr_iid == alloc->_idx) |
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249 return mem; |
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250 } else { |
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251 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw"); |
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252 } |
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253 mem = mem->in(MemNode::Memory); |
584 | 254 } else if (mem->Opcode() == Op_SCMemProj) { |
255 assert(mem->in(0)->is_LoadStore(), "sanity"); | |
256 const TypePtr* atype = mem->in(0)->in(MemNode::Address)->bottom_type()->is_ptr(); | |
257 int adr_idx = Compile::current()->get_alias_index(atype); | |
258 if (adr_idx == alias_idx) { | |
259 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); | |
260 return NULL; | |
261 } | |
262 mem = mem->in(0)->in(MemNode::Memory); | |
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263 } else { |
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264 return mem; |
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265 } |
247 | 266 assert(mem != orig_mem, "dead memory loop"); |
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267 } |
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268 } |
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269 |
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270 // |
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271 // Given a Memory Phi, compute a value Phi containing the values from stores |
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272 // on the input paths. |
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273 // Note: this function is recursive, its depth is limied by the "level" argument |
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274 // Returns the computed Phi, or NULL if it cannot compute it. |
247 | 275 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) { |
276 assert(mem->is_Phi(), "sanity"); | |
277 int alias_idx = C->get_alias_index(adr_t); | |
278 int offset = adr_t->offset(); | |
279 int instance_id = adr_t->instance_id(); | |
280 | |
281 // Check if an appropriate value phi already exists. | |
282 Node* region = mem->in(0); | |
283 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) { | |
284 Node* phi = region->fast_out(k); | |
285 if (phi->is_Phi() && phi != mem && | |
286 phi->as_Phi()->is_same_inst_field(phi_type, instance_id, alias_idx, offset)) { | |
287 return phi; | |
288 } | |
289 } | |
290 // Check if an appropriate new value phi already exists. | |
291 Node* new_phi = NULL; | |
292 uint size = value_phis->size(); | |
293 for (uint i=0; i < size; i++) { | |
294 if ( mem->_idx == value_phis->index_at(i) ) { | |
295 return value_phis->node_at(i); | |
296 } | |
297 } | |
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298 |
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299 if (level <= 0) { |
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300 return NULL; // Give up: phi tree too deep |
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301 } |
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302 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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303 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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304 |
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305 uint length = mem->req(); |
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306 GrowableArray <Node *> values(length, length, NULL); |
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307 |
247 | 308 // create a new Phi for the value |
309 PhiNode *phi = new (C, length) PhiNode(mem->in(0), phi_type, NULL, instance_id, alias_idx, offset); | |
310 transform_later(phi); | |
311 value_phis->push(phi, mem->_idx); | |
312 | |
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313 for (uint j = 1; j < length; j++) { |
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314 Node *in = mem->in(j); |
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315 if (in == NULL || in->is_top()) { |
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316 values.at_put(j, in); |
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317 } else { |
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318 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn); |
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319 if (val == start_mem || val == alloc_mem) { |
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320 // hit a sentinel, return appropriate 0 value |
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321 values.at_put(j, _igvn.zerocon(ft)); |
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322 continue; |
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323 } |
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324 if (val->is_Initialize()) { |
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325 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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326 } |
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327 if (val == NULL) { |
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328 return NULL; // can't find a value on this path |
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329 } |
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330 if (val == mem) { |
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331 values.at_put(j, mem); |
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332 } else if (val->is_Store()) { |
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333 values.at_put(j, val->in(MemNode::ValueIn)); |
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334 } else if(val->is_Proj() && val->in(0) == alloc) { |
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335 values.at_put(j, _igvn.zerocon(ft)); |
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336 } else if (val->is_Phi()) { |
247 | 337 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1); |
338 if (val == NULL) { | |
339 return NULL; | |
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340 } |
247 | 341 values.at_put(j, val); |
584 | 342 } else if (val->Opcode() == Op_SCMemProj) { |
343 assert(val->in(0)->is_LoadStore(), "sanity"); | |
344 assert(false, "Object is not scalar replaceable if a LoadStore node access its field"); | |
345 return NULL; | |
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346 } else { |
584 | 347 #ifdef ASSERT |
348 val->dump(); | |
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349 assert(false, "unknown node on this path"); |
584 | 350 #endif |
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351 return NULL; // unknown node on this path |
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352 } |
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353 } |
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354 } |
247 | 355 // Set Phi's inputs |
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356 for (uint j = 1; j < length; j++) { |
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357 if (values.at(j) == mem) { |
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358 phi->init_req(j, phi); |
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359 } else { |
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360 phi->init_req(j, values.at(j)); |
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361 } |
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362 } |
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363 return phi; |
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364 } |
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365 |
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366 // Search the last value stored into the object's field. |
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367 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc) { |
223 | 368 assert(adr_t->is_known_instance_field(), "instance required"); |
369 int instance_id = adr_t->instance_id(); | |
370 assert((uint)instance_id == alloc->_idx, "wrong allocation"); | |
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371 |
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372 int alias_idx = C->get_alias_index(adr_t); |
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373 int offset = adr_t->offset(); |
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374 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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375 Node *alloc_ctrl = alloc->in(TypeFunc::Control); |
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376 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
247 | 377 Arena *a = Thread::current()->resource_area(); |
378 VectorSet visited(a); | |
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379 |
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380 |
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381 bool done = sfpt_mem == alloc_mem; |
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382 Node *mem = sfpt_mem; |
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383 while (!done) { |
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384 if (visited.test_set(mem->_idx)) { |
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385 return NULL; // found a loop, give up |
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386 } |
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387 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn); |
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388 if (mem == start_mem || mem == alloc_mem) { |
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389 done = true; // hit a sentinel, return appropriate 0 value |
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390 } else if (mem->is_Initialize()) { |
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391 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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392 if (mem == NULL) { |
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393 done = true; // Something go wrong. |
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394 } else if (mem->is_Store()) { |
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395 const TypePtr* atype = mem->as_Store()->adr_type(); |
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396 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice"); |
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397 done = true; |
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398 } |
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399 } else if (mem->is_Store()) { |
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400 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr(); |
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401 assert(atype != NULL, "address type must be oopptr"); |
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402 assert(C->get_alias_index(atype) == alias_idx && |
223 | 403 atype->is_known_instance_field() && atype->offset() == offset && |
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404 atype->instance_id() == instance_id, "store is correct memory slice"); |
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405 done = true; |
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406 } else if (mem->is_Phi()) { |
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407 // try to find a phi's unique input |
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408 Node *unique_input = NULL; |
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409 Node *top = C->top(); |
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410 for (uint i = 1; i < mem->req(); i++) { |
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411 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn); |
73
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412 if (n == NULL || n == top || n == mem) { |
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413 continue; |
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414 } else if (unique_input == NULL) { |
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415 unique_input = n; |
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416 } else if (unique_input != n) { |
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417 unique_input = top; |
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418 break; |
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419 } |
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420 } |
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421 if (unique_input != NULL && unique_input != top) { |
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422 mem = unique_input; |
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423 } else { |
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424 done = true; |
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425 } |
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426 } else { |
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427 assert(false, "unexpected node"); |
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428 } |
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429 } |
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430 if (mem != NULL) { |
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431 if (mem == start_mem || mem == alloc_mem) { |
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432 // hit a sentinel, return appropriate 0 value |
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433 return _igvn.zerocon(ft); |
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434 } else if (mem->is_Store()) { |
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435 return mem->in(MemNode::ValueIn); |
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436 } else if (mem->is_Phi()) { |
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437 // attempt to produce a Phi reflecting the values on the input paths of the Phi |
247 | 438 Node_Stack value_phis(a, 8); |
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439 Node * phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit); |
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440 if (phi != NULL) { |
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441 return phi; |
247 | 442 } else { |
443 // Kill all new Phis | |
444 while(value_phis.is_nonempty()) { | |
445 Node* n = value_phis.node(); | |
446 _igvn.hash_delete(n); | |
447 _igvn.subsume_node(n, C->top()); | |
448 value_phis.pop(); | |
449 } | |
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450 } |
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451 } |
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452 } |
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453 // Something go wrong. |
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454 return NULL; |
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455 } |
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456 |
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457 // Check the possibility of scalar replacement. |
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458 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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459 // Scan the uses of the allocation to check for anything that would |
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460 // prevent us from eliminating it. |
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461 NOT_PRODUCT( const char* fail_eliminate = NULL; ) |
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462 DEBUG_ONLY( Node* disq_node = NULL; ) |
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463 bool can_eliminate = true; |
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464 |
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465 Node* res = alloc->result_cast(); |
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466 const TypeOopPtr* res_type = NULL; |
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467 if (res == NULL) { |
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468 // All users were eliminated. |
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469 } else if (!res->is_CheckCastPP()) { |
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470 alloc->_is_scalar_replaceable = false; // don't try again |
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471 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";) |
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472 can_eliminate = false; |
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473 } else { |
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474 res_type = _igvn.type(res)->isa_oopptr(); |
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475 if (res_type == NULL) { |
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476 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";) |
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477 can_eliminate = false; |
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478 } else if (res_type->isa_aryptr()) { |
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479 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
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480 if (length < 0) { |
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481 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";) |
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482 can_eliminate = false; |
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483 } |
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484 } |
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485 } |
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486 |
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487 if (can_eliminate && res != NULL) { |
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488 for (DUIterator_Fast jmax, j = res->fast_outs(jmax); |
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489 j < jmax && can_eliminate; j++) { |
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490 Node* use = res->fast_out(j); |
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491 |
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492 if (use->is_AddP()) { |
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493 const TypePtr* addp_type = _igvn.type(use)->is_ptr(); |
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494 int offset = addp_type->offset(); |
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495 |
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496 if (offset == Type::OffsetTop || offset == Type::OffsetBot) { |
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497 NOT_PRODUCT(fail_eliminate = "Undefined field referrence";) |
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498 can_eliminate = false; |
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499 break; |
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500 } |
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501 for (DUIterator_Fast kmax, k = use->fast_outs(kmax); |
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502 k < kmax && can_eliminate; k++) { |
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503 Node* n = use->fast_out(k); |
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504 if (!n->is_Store() && n->Opcode() != Op_CastP2X) { |
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505 DEBUG_ONLY(disq_node = n;) |
253
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506 if (n->is_Load() || n->is_LoadStore()) { |
73
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507 NOT_PRODUCT(fail_eliminate = "Field load";) |
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508 } else { |
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509 NOT_PRODUCT(fail_eliminate = "Not store field referrence";) |
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510 } |
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511 can_eliminate = false; |
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512 } |
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513 } |
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514 } else if (use->is_SafePoint()) { |
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515 SafePointNode* sfpt = use->as_SafePoint(); |
168
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516 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) { |
73
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517 // Object is passed as argument. |
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518 DEBUG_ONLY(disq_node = use;) |
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519 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";) |
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520 can_eliminate = false; |
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521 } |
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522 Node* sfptMem = sfpt->memory(); |
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523 if (sfptMem == NULL || sfptMem->is_top()) { |
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524 DEBUG_ONLY(disq_node = use;) |
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525 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";) |
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526 can_eliminate = false; |
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527 } else { |
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528 safepoints.append_if_missing(sfpt); |
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529 } |
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530 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark |
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531 if (use->is_Phi()) { |
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532 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) { |
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533 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
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534 } else { |
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535 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";) |
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536 } |
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537 DEBUG_ONLY(disq_node = use;) |
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538 } else { |
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539 if (use->Opcode() == Op_Return) { |
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540 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
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541 }else { |
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542 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";) |
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543 } |
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544 DEBUG_ONLY(disq_node = use;) |
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545 } |
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546 can_eliminate = false; |
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547 } |
a8880a78d355
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548 } |
a8880a78d355
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549 } |
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550 |
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551 #ifndef PRODUCT |
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552 if (PrintEliminateAllocations) { |
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553 if (can_eliminate) { |
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554 tty->print("Scalar "); |
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555 if (res == NULL) |
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556 alloc->dump(); |
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557 else |
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558 res->dump(); |
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559 } else { |
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560 tty->print("NotScalar (%s)", fail_eliminate); |
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561 if (res == NULL) |
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562 alloc->dump(); |
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563 else |
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564 res->dump(); |
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565 #ifdef ASSERT |
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566 if (disq_node != NULL) { |
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567 tty->print(" >>>> "); |
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568 disq_node->dump(); |
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569 } |
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570 #endif /*ASSERT*/ |
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571 } |
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572 } |
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573 #endif |
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574 return can_eliminate; |
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575 } |
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576 |
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577 // Do scalar replacement. |
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578 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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579 GrowableArray <SafePointNode *> safepoints_done; |
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580 |
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581 ciKlass* klass = NULL; |
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582 ciInstanceKlass* iklass = NULL; |
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583 int nfields = 0; |
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584 int array_base; |
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585 int element_size; |
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586 BasicType basic_elem_type; |
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587 ciType* elem_type; |
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588 |
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589 Node* res = alloc->result_cast(); |
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590 const TypeOopPtr* res_type = NULL; |
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591 if (res != NULL) { // Could be NULL when there are no users |
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592 res_type = _igvn.type(res)->isa_oopptr(); |
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593 } |
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594 |
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595 if (res != NULL) { |
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596 klass = res_type->klass(); |
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597 if (res_type->isa_instptr()) { |
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598 // find the fields of the class which will be needed for safepoint debug information |
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599 assert(klass->is_instance_klass(), "must be an instance klass."); |
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600 iklass = klass->as_instance_klass(); |
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601 nfields = iklass->nof_nonstatic_fields(); |
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602 } else { |
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603 // find the array's elements which will be needed for safepoint debug information |
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604 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
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605 assert(klass->is_array_klass() && nfields >= 0, "must be an array klass."); |
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606 elem_type = klass->as_array_klass()->element_type(); |
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607 basic_elem_type = elem_type->basic_type(); |
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608 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type); |
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609 element_size = type2aelembytes(basic_elem_type); |
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610 } |
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611 } |
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612 // |
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613 // Process the safepoint uses |
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614 // |
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615 while (safepoints.length() > 0) { |
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616 SafePointNode* sfpt = safepoints.pop(); |
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617 Node* mem = sfpt->memory(); |
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618 uint first_ind = sfpt->req(); |
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619 SafePointScalarObjectNode* sobj = new (C, 1) SafePointScalarObjectNode(res_type, |
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620 #ifdef ASSERT |
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621 alloc, |
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622 #endif |
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623 first_ind, nfields); |
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624 sobj->init_req(0, sfpt->in(TypeFunc::Control)); |
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625 transform_later(sobj); |
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626 |
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627 // Scan object's fields adding an input to the safepoint for each field. |
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628 for (int j = 0; j < nfields; j++) { |
306
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629 intptr_t offset; |
73
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630 ciField* field = NULL; |
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631 if (iklass != NULL) { |
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632 field = iklass->nonstatic_field_at(j); |
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633 offset = field->offset(); |
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634 elem_type = field->type(); |
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635 basic_elem_type = field->layout_type(); |
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636 } else { |
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637 offset = array_base + j * (intptr_t)element_size; |
73
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638 } |
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639 |
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640 const Type *field_type; |
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641 // The next code is taken from Parse::do_get_xxx(). |
124
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642 if (basic_elem_type == T_OBJECT || basic_elem_type == T_ARRAY) { |
73
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643 if (!elem_type->is_loaded()) { |
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644 field_type = TypeInstPtr::BOTTOM; |
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645 } else if (field != NULL && field->is_constant()) { |
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646 // This can happen if the constant oop is non-perm. |
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647 ciObject* con = field->constant_value().as_object(); |
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648 // Do not "join" in the previous type; it doesn't add value, |
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649 // and may yield a vacuous result if the field is of interface type. |
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650 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); |
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651 assert(field_type != NULL, "field singleton type must be consistent"); |
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652 } else { |
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653 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass()); |
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654 } |
124
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655 if (UseCompressedOops) { |
221
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656 field_type = field_type->make_narrowoop(); |
124
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657 basic_elem_type = T_NARROWOOP; |
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658 } |
73
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659 } else { |
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660 field_type = Type::get_const_basic_type(basic_elem_type); |
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661 } |
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662 |
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663 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr(); |
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664 |
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665 Node *field_val = value_from_mem(mem, basic_elem_type, field_type, field_addr_type, alloc); |
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666 if (field_val == NULL) { |
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667 // we weren't able to find a value for this field, |
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668 // give up on eliminating this allocation |
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669 alloc->_is_scalar_replaceable = false; // don't try again |
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670 // remove any extra entries we added to the safepoint |
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671 uint last = sfpt->req() - 1; |
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672 for (int k = 0; k < j; k++) { |
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673 sfpt->del_req(last--); |
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|
674 } |
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|
675 // rollback processed safepoints |
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676 while (safepoints_done.length() > 0) { |
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677 SafePointNode* sfpt_done = safepoints_done.pop(); |
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|
678 // remove any extra entries we added to the safepoint |
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679 last = sfpt_done->req() - 1; |
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|
680 for (int k = 0; k < nfields; k++) { |
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|
681 sfpt_done->del_req(last--); |
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|
682 } |
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|
683 JVMState *jvms = sfpt_done->jvms(); |
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684 jvms->set_endoff(sfpt_done->req()); |
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|
685 // Now make a pass over the debug information replacing any references |
a8880a78d355
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686 // to SafePointScalarObjectNode with the allocated object. |
a8880a78d355
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kvn
parents:
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diff
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|
687 int start = jvms->debug_start(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
688 int end = jvms->debug_end(); |
a8880a78d355
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kvn
parents:
66
diff
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|
689 for (int i = start; i < end; i++) { |
a8880a78d355
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690 if (sfpt_done->in(i)->is_SafePointScalarObject()) { |
a8880a78d355
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691 SafePointScalarObjectNode* scobj = sfpt_done->in(i)->as_SafePointScalarObject(); |
a8880a78d355
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692 if (scobj->first_index() == sfpt_done->req() && |
a8880a78d355
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693 scobj->n_fields() == (uint)nfields) { |
a8880a78d355
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694 assert(scobj->alloc() == alloc, "sanity"); |
a8880a78d355
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kvn
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|
695 sfpt_done->set_req(i, res); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
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|
696 } |
a8880a78d355
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kvn
parents:
66
diff
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|
697 } |
a8880a78d355
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diff
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|
698 } |
a8880a78d355
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|
699 } |
a8880a78d355
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|
700 #ifndef PRODUCT |
a8880a78d355
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701 if (PrintEliminateAllocations) { |
a8880a78d355
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|
702 if (field != NULL) { |
a8880a78d355
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|
703 tty->print("=== At SafePoint node %d can't find value of Field: ", |
a8880a78d355
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|
704 sfpt->_idx); |
a8880a78d355
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|
705 field->print(); |
a8880a78d355
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|
706 int field_idx = C->get_alias_index(field_addr_type); |
a8880a78d355
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707 tty->print(" (alias_idx=%d)", field_idx); |
a8880a78d355
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708 } else { // Array's element |
a8880a78d355
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709 tty->print("=== At SafePoint node %d can't find value of array element [%d]", |
a8880a78d355
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|
710 sfpt->_idx, j); |
a8880a78d355
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|
711 } |
a8880a78d355
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|
712 tty->print(", which prevents elimination of: "); |
a8880a78d355
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|
713 if (res == NULL) |
a8880a78d355
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|
714 alloc->dump(); |
a8880a78d355
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|
715 else |
a8880a78d355
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|
716 res->dump(); |
a8880a78d355
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|
717 } |
a8880a78d355
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|
718 #endif |
a8880a78d355
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|
719 return false; |
a8880a78d355
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|
720 } |
124
b130b98db9cf
6689060: Escape Analysis does not work with Compressed Oops
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|
721 if (UseCompressedOops && field_type->isa_narrowoop()) { |
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722 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation |
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723 // to be able scalar replace the allocation. |
221
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
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diff
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|
724 if (field_val->is_EncodeP()) { |
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
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725 field_val = field_val->in(1); |
1e026f8da827
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|
726 } else { |
1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
kvn
parents:
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diff
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|
727 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
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|
728 } |
124
b130b98db9cf
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diff
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|
729 } |
73
a8880a78d355
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diff
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|
730 sfpt->add_req(field_val); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
changeset
|
731 } |
a8880a78d355
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kvn
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diff
changeset
|
732 JVMState *jvms = sfpt->jvms(); |
a8880a78d355
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733 jvms->set_endoff(sfpt->req()); |
a8880a78d355
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diff
changeset
|
734 // Now make a pass over the debug information replacing any references |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
735 // to the allocated object with "sobj" |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
736 int start = jvms->debug_start(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
737 int end = jvms->debug_end(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
738 for (int i = start; i < end; i++) { |
a8880a78d355
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|
739 if (sfpt->in(i) == res) { |
a8880a78d355
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kvn
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diff
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|
740 sfpt->set_req(i, sobj); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
741 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
742 } |
a8880a78d355
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kvn
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diff
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|
743 safepoints_done.append_if_missing(sfpt); // keep it for rollback |
a8880a78d355
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diff
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|
744 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
745 return true; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
746 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
747 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
748 // Process users of eliminated allocation. |
a8880a78d355
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diff
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|
749 void PhaseMacroExpand::process_users_of_allocation(AllocateNode *alloc) { |
a8880a78d355
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kvn
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66
diff
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|
750 Node* res = alloc->result_cast(); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
751 if (res != NULL) { |
a8880a78d355
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kvn
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66
diff
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|
752 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) { |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
753 Node *use = res->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
754 uint oc1 = res->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
755 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
756 if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
757 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) { |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
758 Node *n = use->last_out(k); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
759 uint oc2 = use->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
760 if (n->is_Store()) { |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
761 _igvn.replace_node(n, n->in(MemNode::Memory)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
762 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
763 assert( n->Opcode() == Op_CastP2X, "CastP2X required"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
764 eliminate_card_mark(n); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
765 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
766 k -= (oc2 - use->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
767 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
768 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
769 assert( !use->is_SafePoint(), "safepoint uses must have been already elimiated"); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
770 assert( use->Opcode() == Op_CastP2X, "CastP2X required"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
771 eliminate_card_mark(use); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
772 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
773 j -= (oc1 - res->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
774 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
775 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
|
776 _igvn.remove_dead_node(res); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
777 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
778 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
779 // |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
780 // Process other users of allocation's projections |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
781 // |
a8880a78d355
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kvn
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66
diff
changeset
|
782 if (_resproj != NULL && _resproj->outcnt() != 0) { |
a8880a78d355
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kvn
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diff
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|
783 for (DUIterator_Last jmin, j = _resproj->last_outs(jmin); j >= jmin; ) { |
a8880a78d355
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kvn
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diff
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|
784 Node *use = _resproj->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
785 uint oc1 = _resproj->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
786 if (use->is_Initialize()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
787 // Eliminate Initialize node. |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
788 InitializeNode *init = use->as_Initialize(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
789 assert(init->outcnt() <= 2, "only a control and memory projection expected"); |
a8880a78d355
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kvn
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66
diff
changeset
|
790 Node *ctrl_proj = init->proj_out(TypeFunc::Control); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
791 if (ctrl_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
792 assert(init->in(TypeFunc::Control) == _fallthroughcatchproj, "allocation control projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
793 _igvn.replace_node(ctrl_proj, _fallthroughcatchproj); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
794 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
795 Node *mem_proj = init->proj_out(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
796 if (mem_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
797 Node *mem = init->in(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
798 #ifdef ASSERT |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
799 if (mem->is_MergeMem()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
800 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
|
801 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
802 assert(mem == _memproj_fallthrough, "allocation memory projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
803 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
804 #endif |
a8880a78d355
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kvn
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66
diff
changeset
|
805 _igvn.replace_node(mem_proj, mem); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
806 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
807 } else if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
808 // 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
|
809 _igvn.replace_node(use, C->top()); |
73
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
810 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
811 assert(false, "only Initialize or AddP expected"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
812 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
813 j -= (oc1 - _resproj->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
814 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
815 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
816 if (_fallthroughcatchproj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
817 _igvn.replace_node(_fallthroughcatchproj, alloc->in(TypeFunc::Control)); |
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818 } |
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819 if (_memproj_fallthrough != NULL) { |
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820 _igvn.replace_node(_memproj_fallthrough, alloc->in(TypeFunc::Memory)); |
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821 } |
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822 if (_memproj_catchall != NULL) { |
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823 _igvn.replace_node(_memproj_catchall, C->top()); |
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824 } |
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825 if (_ioproj_fallthrough != NULL) { |
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826 _igvn.replace_node(_ioproj_fallthrough, alloc->in(TypeFunc::I_O)); |
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827 } |
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828 if (_ioproj_catchall != NULL) { |
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829 _igvn.replace_node(_ioproj_catchall, C->top()); |
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830 } |
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831 if (_catchallcatchproj != NULL) { |
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832 _igvn.replace_node(_catchallcatchproj, C->top()); |
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833 } |
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834 } |
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835 |
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836 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) { |
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837 |
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838 if (!EliminateAllocations || !alloc->_is_scalar_replaceable) { |
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839 return false; |
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840 } |
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841 |
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842 extract_call_projections(alloc); |
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843 |
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844 GrowableArray <SafePointNode *> safepoints; |
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845 if (!can_eliminate_allocation(alloc, safepoints)) { |
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846 return false; |
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847 } |
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848 |
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849 if (!scalar_replacement(alloc, safepoints)) { |
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850 return false; |
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851 } |
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852 |
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853 process_users_of_allocation(alloc); |
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854 |
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855 #ifndef PRODUCT |
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856 if (PrintEliminateAllocations) { |
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857 if (alloc->is_AllocateArray()) |
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858 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx); |
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859 else |
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860 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx); |
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861 } |
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862 #endif |
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863 |
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864 return true; |
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865 } |
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866 |
0 | 867 |
868 //---------------------------set_eden_pointers------------------------- | |
869 void PhaseMacroExpand::set_eden_pointers(Node* &eden_top_adr, Node* &eden_end_adr) { | |
870 if (UseTLAB) { // Private allocation: load from TLS | |
871 Node* thread = transform_later(new (C, 1) ThreadLocalNode()); | |
872 int tlab_top_offset = in_bytes(JavaThread::tlab_top_offset()); | |
873 int tlab_end_offset = in_bytes(JavaThread::tlab_end_offset()); | |
874 eden_top_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_top_offset); | |
875 eden_end_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_end_offset); | |
876 } else { // Shared allocation: load from globals | |
877 CollectedHeap* ch = Universe::heap(); | |
878 address top_adr = (address)ch->top_addr(); | |
879 address end_adr = (address)ch->end_addr(); | |
880 eden_top_adr = makecon(TypeRawPtr::make(top_adr)); | |
881 eden_end_adr = basic_plus_adr(eden_top_adr, end_adr - top_adr); | |
882 } | |
883 } | |
884 | |
885 | |
886 Node* PhaseMacroExpand::make_load(Node* ctl, Node* mem, Node* base, int offset, const Type* value_type, BasicType bt) { | |
887 Node* adr = basic_plus_adr(base, offset); | |
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888 const TypePtr* adr_type = adr->bottom_type()->is_ptr(); |
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889 Node* value = LoadNode::make(_igvn, ctl, mem, adr, adr_type, value_type, bt); |
0 | 890 transform_later(value); |
891 return value; | |
892 } | |
893 | |
894 | |
895 Node* PhaseMacroExpand::make_store(Node* ctl, Node* mem, Node* base, int offset, Node* value, BasicType bt) { | |
896 Node* adr = basic_plus_adr(base, offset); | |
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897 mem = StoreNode::make(_igvn, ctl, mem, adr, NULL, value, bt); |
0 | 898 transform_later(mem); |
899 return mem; | |
900 } | |
901 | |
902 //============================================================================= | |
903 // | |
904 // A L L O C A T I O N | |
905 // | |
906 // Allocation attempts to be fast in the case of frequent small objects. | |
907 // It breaks down like this: | |
908 // | |
909 // 1) Size in doublewords is computed. This is a constant for objects and | |
910 // variable for most arrays. Doubleword units are used to avoid size | |
911 // overflow of huge doubleword arrays. We need doublewords in the end for | |
912 // rounding. | |
913 // | |
914 // 2) Size is checked for being 'too large'. Too-large allocations will go | |
915 // the slow path into the VM. The slow path can throw any required | |
916 // exceptions, and does all the special checks for very large arrays. The | |
917 // size test can constant-fold away for objects. For objects with | |
918 // finalizers it constant-folds the otherway: you always go slow with | |
919 // finalizers. | |
920 // | |
921 // 3) If NOT using TLABs, this is the contended loop-back point. | |
922 // Load-Locked the heap top. If using TLABs normal-load the heap top. | |
923 // | |
924 // 4) Check that heap top + size*8 < max. If we fail go the slow ` route. | |
925 // NOTE: "top+size*8" cannot wrap the 4Gig line! Here's why: for largish | |
926 // "size*8" we always enter the VM, where "largish" is a constant picked small | |
927 // enough that there's always space between the eden max and 4Gig (old space is | |
928 // there so it's quite large) and large enough that the cost of entering the VM | |
929 // is dwarfed by the cost to initialize the space. | |
930 // | |
931 // 5) If NOT using TLABs, Store-Conditional the adjusted heap top back | |
932 // down. If contended, repeat at step 3. If using TLABs normal-store | |
933 // adjusted heap top back down; there is no contention. | |
934 // | |
935 // 6) If !ZeroTLAB then Bulk-clear the object/array. Fill in klass & mark | |
936 // fields. | |
937 // | |
938 // 7) Merge with the slow-path; cast the raw memory pointer to the correct | |
939 // oop flavor. | |
940 // | |
941 //============================================================================= | |
942 // FastAllocateSizeLimit value is in DOUBLEWORDS. | |
943 // Allocations bigger than this always go the slow route. | |
944 // This value must be small enough that allocation attempts that need to | |
945 // trigger exceptions go the slow route. Also, it must be small enough so | |
946 // that heap_top + size_in_bytes does not wrap around the 4Gig limit. | |
947 //=============================================================================j// | |
948 // %%% Here is an old comment from parseHelper.cpp; is it outdated? | |
949 // The allocator will coalesce int->oop copies away. See comment in | |
950 // coalesce.cpp about how this works. It depends critically on the exact | |
951 // code shape produced here, so if you are changing this code shape | |
952 // make sure the GC info for the heap-top is correct in and around the | |
953 // slow-path call. | |
954 // | |
955 | |
956 void PhaseMacroExpand::expand_allocate_common( | |
957 AllocateNode* alloc, // allocation node to be expanded | |
958 Node* length, // array length for an array allocation | |
959 const TypeFunc* slow_call_type, // Type of slow call | |
960 address slow_call_address // Address of slow call | |
961 ) | |
962 { | |
963 | |
964 Node* ctrl = alloc->in(TypeFunc::Control); | |
965 Node* mem = alloc->in(TypeFunc::Memory); | |
966 Node* i_o = alloc->in(TypeFunc::I_O); | |
967 Node* size_in_bytes = alloc->in(AllocateNode::AllocSize); | |
968 Node* klass_node = alloc->in(AllocateNode::KlassNode); | |
969 Node* initial_slow_test = alloc->in(AllocateNode::InitialTest); | |
970 | |
971 assert(ctrl != NULL, "must have control"); | |
972 // We need a Region and corresponding Phi's to merge the slow-path and fast-path results. | |
973 // they will not be used if "always_slow" is set | |
974 enum { slow_result_path = 1, fast_result_path = 2 }; | |
975 Node *result_region; | |
976 Node *result_phi_rawmem; | |
977 Node *result_phi_rawoop; | |
978 Node *result_phi_i_o; | |
979 | |
980 // The initial slow comparison is a size check, the comparison | |
981 // we want to do is a BoolTest::gt | |
982 bool always_slow = false; | |
983 int tv = _igvn.find_int_con(initial_slow_test, -1); | |
984 if (tv >= 0) { | |
985 always_slow = (tv == 1); | |
986 initial_slow_test = NULL; | |
987 } else { | |
988 initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn); | |
989 } | |
990 | |
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991 if (DTraceAllocProbes || |
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992 !UseTLAB && (!Universe::heap()->supports_inline_contig_alloc() || |
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993 (UseConcMarkSweepGC && CMSIncrementalMode))) { |
0 | 994 // Force slow-path allocation |
995 always_slow = true; | |
996 initial_slow_test = NULL; | |
997 } | |
998 | |
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999 |
0 | 1000 enum { too_big_or_final_path = 1, need_gc_path = 2 }; |
1001 Node *slow_region = NULL; | |
1002 Node *toobig_false = ctrl; | |
1003 | |
1004 assert (initial_slow_test == NULL || !always_slow, "arguments must be consistent"); | |
1005 // generate the initial test if necessary | |
1006 if (initial_slow_test != NULL ) { | |
1007 slow_region = new (C, 3) RegionNode(3); | |
1008 | |
1009 // Now make the initial failure test. Usually a too-big test but | |
1010 // might be a TRUE for finalizers or a fancy class check for | |
1011 // newInstance0. | |
1012 IfNode *toobig_iff = new (C, 2) IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN); | |
1013 transform_later(toobig_iff); | |
1014 // Plug the failing-too-big test into the slow-path region | |
1015 Node *toobig_true = new (C, 1) IfTrueNode( toobig_iff ); | |
1016 transform_later(toobig_true); | |
1017 slow_region ->init_req( too_big_or_final_path, toobig_true ); | |
1018 toobig_false = new (C, 1) IfFalseNode( toobig_iff ); | |
1019 transform_later(toobig_false); | |
1020 } else { // No initial test, just fall into next case | |
1021 toobig_false = ctrl; | |
1022 debug_only(slow_region = NodeSentinel); | |
1023 } | |
1024 | |
1025 Node *slow_mem = mem; // save the current memory state for slow path | |
1026 // generate the fast allocation code unless we know that the initial test will always go slow | |
1027 if (!always_slow) { | |
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1028 // Fast path modifies only raw memory. |
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1029 if (mem->is_MergeMem()) { |
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1030 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw); |
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1031 } |
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1032 |
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1033 Node* eden_top_adr; |
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1034 Node* eden_end_adr; |
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1035 |
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1036 set_eden_pointers(eden_top_adr, eden_end_adr); |
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1037 |
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1038 // Load Eden::end. Loop invariant and hoisted. |
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1039 // |
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1040 // Note: We set the control input on "eden_end" and "old_eden_top" when using |
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1041 // a TLAB to work around a bug where these values were being moved across |
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1042 // a safepoint. These are not oops, so they cannot be include in the oop |
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1043 // map, but the can be changed by a GC. The proper way to fix this would |
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1044 // be to set the raw memory state when generating a SafepointNode. However |
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1045 // this will require extensive changes to the loop optimization in order to |
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1046 // prevent a degradation of the optimization. |
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1047 // See comment in memnode.hpp, around line 227 in class LoadPNode. |
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1048 Node *eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS); |
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1049 |
0 | 1050 // allocate the Region and Phi nodes for the result |
1051 result_region = new (C, 3) RegionNode(3); | |
1052 result_phi_rawmem = new (C, 3) PhiNode( result_region, Type::MEMORY, TypeRawPtr::BOTTOM ); | |
1053 result_phi_rawoop = new (C, 3) PhiNode( result_region, TypeRawPtr::BOTTOM ); | |
1054 result_phi_i_o = new (C, 3) PhiNode( result_region, Type::ABIO ); // I/O is used for Prefetch | |
1055 | |
1056 // We need a Region for the loop-back contended case. | |
1057 enum { fall_in_path = 1, contended_loopback_path = 2 }; | |
1058 Node *contended_region; | |
1059 Node *contended_phi_rawmem; | |
1060 if( UseTLAB ) { | |
1061 contended_region = toobig_false; | |
1062 contended_phi_rawmem = mem; | |
1063 } else { | |
1064 contended_region = new (C, 3) RegionNode(3); | |
1065 contended_phi_rawmem = new (C, 3) PhiNode( contended_region, Type::MEMORY, TypeRawPtr::BOTTOM); | |
1066 // Now handle the passing-too-big test. We fall into the contended | |
1067 // loop-back merge point. | |
1068 contended_region ->init_req( fall_in_path, toobig_false ); | |
1069 contended_phi_rawmem->init_req( fall_in_path, mem ); | |
1070 transform_later(contended_region); | |
1071 transform_later(contended_phi_rawmem); | |
1072 } | |
1073 | |
1074 // Load(-locked) the heap top. | |
1075 // See note above concerning the control input when using a TLAB | |
1076 Node *old_eden_top = UseTLAB | |
1077 ? new (C, 3) LoadPNode ( ctrl, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ) | |
1078 : new (C, 3) LoadPLockedNode( contended_region, contended_phi_rawmem, eden_top_adr ); | |
1079 | |
1080 transform_later(old_eden_top); | |
1081 // Add to heap top to get a new heap top | |
1082 Node *new_eden_top = new (C, 4) AddPNode( top(), old_eden_top, size_in_bytes ); | |
1083 transform_later(new_eden_top); | |
1084 // Check for needing a GC; compare against heap end | |
1085 Node *needgc_cmp = new (C, 3) CmpPNode( new_eden_top, eden_end ); | |
1086 transform_later(needgc_cmp); | |
1087 Node *needgc_bol = new (C, 2) BoolNode( needgc_cmp, BoolTest::ge ); | |
1088 transform_later(needgc_bol); | |
1089 IfNode *needgc_iff = new (C, 2) IfNode(contended_region, needgc_bol, PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); | |
1090 transform_later(needgc_iff); | |
1091 | |
1092 // Plug the failing-heap-space-need-gc test into the slow-path region | |
1093 Node *needgc_true = new (C, 1) IfTrueNode( needgc_iff ); | |
1094 transform_later(needgc_true); | |
1095 if( initial_slow_test ) { | |
1096 slow_region ->init_req( need_gc_path, needgc_true ); | |
1097 // This completes all paths into the slow merge point | |
1098 transform_later(slow_region); | |
1099 } else { // No initial slow path needed! | |
1100 // Just fall from the need-GC path straight into the VM call. | |
1101 slow_region = needgc_true; | |
1102 } | |
1103 // No need for a GC. Setup for the Store-Conditional | |
1104 Node *needgc_false = new (C, 1) IfFalseNode( needgc_iff ); | |
1105 transform_later(needgc_false); | |
1106 | |
1107 // Grab regular I/O before optional prefetch may change it. | |
1108 // Slow-path does no I/O so just set it to the original I/O. | |
1109 result_phi_i_o->init_req( slow_result_path, i_o ); | |
1110 | |
1111 i_o = prefetch_allocation(i_o, needgc_false, contended_phi_rawmem, | |
1112 old_eden_top, new_eden_top, length); | |
1113 | |
1114 // Store (-conditional) the modified eden top back down. | |
1115 // StorePConditional produces flags for a test PLUS a modified raw | |
1116 // memory state. | |
1117 Node *store_eden_top; | |
1118 Node *fast_oop_ctrl; | |
1119 if( UseTLAB ) { | |
1120 store_eden_top = new (C, 4) StorePNode( needgc_false, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, new_eden_top ); | |
1121 transform_later(store_eden_top); | |
1122 fast_oop_ctrl = needgc_false; // No contention, so this is the fast path | |
1123 } else { | |
1124 store_eden_top = new (C, 5) StorePConditionalNode( needgc_false, contended_phi_rawmem, eden_top_adr, new_eden_top, old_eden_top ); | |
1125 transform_later(store_eden_top); | |
1126 Node *contention_check = new (C, 2) BoolNode( store_eden_top, BoolTest::ne ); | |
1127 transform_later(contention_check); | |
1128 store_eden_top = new (C, 1) SCMemProjNode(store_eden_top); | |
1129 transform_later(store_eden_top); | |
1130 | |
1131 // If not using TLABs, check to see if there was contention. | |
1132 IfNode *contention_iff = new (C, 2) IfNode ( needgc_false, contention_check, PROB_MIN, COUNT_UNKNOWN ); | |
1133 transform_later(contention_iff); | |
1134 Node *contention_true = new (C, 1) IfTrueNode( contention_iff ); | |
1135 transform_later(contention_true); | |
1136 // If contention, loopback and try again. | |
1137 contended_region->init_req( contended_loopback_path, contention_true ); | |
1138 contended_phi_rawmem->init_req( contended_loopback_path, store_eden_top ); | |
1139 | |
1140 // Fast-path succeeded with no contention! | |
1141 Node *contention_false = new (C, 1) IfFalseNode( contention_iff ); | |
1142 transform_later(contention_false); | |
1143 fast_oop_ctrl = contention_false; | |
1144 } | |
1145 | |
1146 // Rename successful fast-path variables to make meaning more obvious | |
1147 Node* fast_oop = old_eden_top; | |
1148 Node* fast_oop_rawmem = store_eden_top; | |
1149 fast_oop_rawmem = initialize_object(alloc, | |
1150 fast_oop_ctrl, fast_oop_rawmem, fast_oop, | |
1151 klass_node, length, size_in_bytes); | |
1152 | |
1153 if (ExtendedDTraceProbes) { | |
1154 // Slow-path call | |
1155 int size = TypeFunc::Parms + 2; | |
1156 CallLeafNode *call = new (C, size) CallLeafNode(OptoRuntime::dtrace_object_alloc_Type(), | |
1157 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc_base), | |
1158 "dtrace_object_alloc", | |
1159 TypeRawPtr::BOTTOM); | |
1160 | |
1161 // Get base of thread-local storage area | |
1162 Node* thread = new (C, 1) ThreadLocalNode(); | |
1163 transform_later(thread); | |
1164 | |
1165 call->init_req(TypeFunc::Parms+0, thread); | |
1166 call->init_req(TypeFunc::Parms+1, fast_oop); | |
1167 call->init_req( TypeFunc::Control, fast_oop_ctrl ); | |
1168 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1169 call->init_req( TypeFunc::Memory , fast_oop_rawmem ); | |
1170 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1171 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1172 transform_later(call); | |
1173 fast_oop_ctrl = new (C, 1) ProjNode(call,TypeFunc::Control); | |
1174 transform_later(fast_oop_ctrl); | |
1175 fast_oop_rawmem = new (C, 1) ProjNode(call,TypeFunc::Memory); | |
1176 transform_later(fast_oop_rawmem); | |
1177 } | |
1178 | |
1179 // Plug in the successful fast-path into the result merge point | |
1180 result_region ->init_req( fast_result_path, fast_oop_ctrl ); | |
1181 result_phi_rawoop->init_req( fast_result_path, fast_oop ); | |
1182 result_phi_i_o ->init_req( fast_result_path, i_o ); | |
1183 result_phi_rawmem->init_req( fast_result_path, fast_oop_rawmem ); | |
1184 } else { | |
1185 slow_region = ctrl; | |
1186 } | |
1187 | |
1188 // Generate slow-path call | |
1189 CallNode *call = new (C, slow_call_type->domain()->cnt()) | |
1190 CallStaticJavaNode(slow_call_type, slow_call_address, | |
1191 OptoRuntime::stub_name(slow_call_address), | |
1192 alloc->jvms()->bci(), | |
1193 TypePtr::BOTTOM); | |
1194 call->init_req( TypeFunc::Control, slow_region ); | |
1195 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1196 call->init_req( TypeFunc::Memory , slow_mem ); // may gc ptrs | |
1197 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1198 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1199 | |
1200 call->init_req(TypeFunc::Parms+0, klass_node); | |
1201 if (length != NULL) { | |
1202 call->init_req(TypeFunc::Parms+1, length); | |
1203 } | |
1204 | |
1205 // Copy debug information and adjust JVMState information, then replace | |
1206 // allocate node with the call | |
1207 copy_call_debug_info((CallNode *) alloc, call); | |
1208 if (!always_slow) { | |
1209 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
1210 } | |
1211 _igvn.hash_delete(alloc); | |
1212 _igvn.subsume_node(alloc, call); | |
1213 transform_later(call); | |
1214 | |
1215 // Identify the output projections from the allocate node and | |
1216 // adjust any references to them. | |
1217 // The control and io projections look like: | |
1218 // | |
1219 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl) | |
1220 // Allocate Catch | |
1221 // ^---Proj(io) <-------+ ^---CatchProj(io) | |
1222 // | |
1223 // We are interested in the CatchProj nodes. | |
1224 // | |
1225 extract_call_projections(call); | |
1226 | |
1227 // An allocate node has separate memory projections for the uses on the control and i_o paths | |
1228 // Replace uses of the control memory projection with result_phi_rawmem (unless we are only generating a slow call) | |
1229 if (!always_slow && _memproj_fallthrough != NULL) { | |
1230 for (DUIterator_Fast imax, i = _memproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1231 Node *use = _memproj_fallthrough->fast_out(i); | |
1232 _igvn.hash_delete(use); | |
1233 imax -= replace_input(use, _memproj_fallthrough, result_phi_rawmem); | |
1234 _igvn._worklist.push(use); | |
1235 // back up iterator | |
1236 --i; | |
1237 } | |
1238 } | |
1239 // Now change uses of _memproj_catchall to use _memproj_fallthrough and delete _memproj_catchall so | |
1240 // we end up with a call that has only 1 memory projection | |
1241 if (_memproj_catchall != NULL ) { | |
1242 if (_memproj_fallthrough == NULL) { | |
1243 _memproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::Memory); | |
1244 transform_later(_memproj_fallthrough); | |
1245 } | |
1246 for (DUIterator_Fast imax, i = _memproj_catchall->fast_outs(imax); i < imax; i++) { | |
1247 Node *use = _memproj_catchall->fast_out(i); | |
1248 _igvn.hash_delete(use); | |
1249 imax -= replace_input(use, _memproj_catchall, _memproj_fallthrough); | |
1250 _igvn._worklist.push(use); | |
1251 // back up iterator | |
1252 --i; | |
1253 } | |
1254 } | |
1255 | |
1256 // An allocate node has separate i_o projections for the uses on the control and i_o paths | |
1257 // Replace uses of the control i_o projection with result_phi_i_o (unless we are only generating a slow call) | |
1258 if (_ioproj_fallthrough == NULL) { | |
1259 _ioproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::I_O); | |
1260 transform_later(_ioproj_fallthrough); | |
1261 } else if (!always_slow) { | |
1262 for (DUIterator_Fast imax, i = _ioproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1263 Node *use = _ioproj_fallthrough->fast_out(i); | |
1264 | |
1265 _igvn.hash_delete(use); | |
1266 imax -= replace_input(use, _ioproj_fallthrough, result_phi_i_o); | |
1267 _igvn._worklist.push(use); | |
1268 // back up iterator | |
1269 --i; | |
1270 } | |
1271 } | |
1272 // Now change uses of _ioproj_catchall to use _ioproj_fallthrough and delete _ioproj_catchall so | |
1273 // we end up with a call that has only 1 control projection | |
1274 if (_ioproj_catchall != NULL ) { | |
1275 for (DUIterator_Fast imax, i = _ioproj_catchall->fast_outs(imax); i < imax; i++) { | |
1276 Node *use = _ioproj_catchall->fast_out(i); | |
1277 _igvn.hash_delete(use); | |
1278 imax -= replace_input(use, _ioproj_catchall, _ioproj_fallthrough); | |
1279 _igvn._worklist.push(use); | |
1280 // back up iterator | |
1281 --i; | |
1282 } | |
1283 } | |
1284 | |
1285 // if we generated only a slow call, we are done | |
1286 if (always_slow) | |
1287 return; | |
1288 | |
1289 | |
1290 if (_fallthroughcatchproj != NULL) { | |
1291 ctrl = _fallthroughcatchproj->clone(); | |
1292 transform_later(ctrl); | |
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1293 _igvn.replace_node(_fallthroughcatchproj, result_region); |
0 | 1294 } else { |
1295 ctrl = top(); | |
1296 } | |
1297 Node *slow_result; | |
1298 if (_resproj == NULL) { | |
1299 // no uses of the allocation result | |
1300 slow_result = top(); | |
1301 } else { | |
1302 slow_result = _resproj->clone(); | |
1303 transform_later(slow_result); | |
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1304 _igvn.replace_node(_resproj, result_phi_rawoop); |
0 | 1305 } |
1306 | |
1307 // Plug slow-path into result merge point | |
1308 result_region ->init_req( slow_result_path, ctrl ); | |
1309 result_phi_rawoop->init_req( slow_result_path, slow_result); | |
1310 result_phi_rawmem->init_req( slow_result_path, _memproj_fallthrough ); | |
1311 transform_later(result_region); | |
1312 transform_later(result_phi_rawoop); | |
1313 transform_later(result_phi_rawmem); | |
1314 transform_later(result_phi_i_o); | |
1315 // This completes all paths into the result merge point | |
1316 } | |
1317 | |
1318 | |
1319 // Helper for PhaseMacroExpand::expand_allocate_common. | |
1320 // Initializes the newly-allocated storage. | |
1321 Node* | |
1322 PhaseMacroExpand::initialize_object(AllocateNode* alloc, | |
1323 Node* control, Node* rawmem, Node* object, | |
1324 Node* klass_node, Node* length, | |
1325 Node* size_in_bytes) { | |
1326 InitializeNode* init = alloc->initialization(); | |
1327 // Store the klass & mark bits | |
1328 Node* mark_node = NULL; | |
1329 // For now only enable fast locking for non-array types | |
1330 if (UseBiasedLocking && (length == NULL)) { | |
1331 mark_node = make_load(NULL, rawmem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeRawPtr::BOTTOM, T_ADDRESS); | |
1332 } else { | |
1333 mark_node = makecon(TypeRawPtr::make((address)markOopDesc::prototype())); | |
1334 } | |
1335 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS); | |
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1336 |
0 | 1337 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_OBJECT); |
1338 int header_size = alloc->minimum_header_size(); // conservatively small | |
1339 | |
1340 // Array length | |
1341 if (length != NULL) { // Arrays need length field | |
1342 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT); | |
1343 // conservatively small header size: | |
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1344 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE); |
0 | 1345 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass(); |
1346 if (k->is_array_klass()) // we know the exact header size in most cases: | |
1347 header_size = Klass::layout_helper_header_size(k->layout_helper()); | |
1348 } | |
1349 | |
1350 // Clear the object body, if necessary. | |
1351 if (init == NULL) { | |
1352 // The init has somehow disappeared; be cautious and clear everything. | |
1353 // | |
1354 // This can happen if a node is allocated but an uncommon trap occurs | |
1355 // immediately. In this case, the Initialize gets associated with the | |
1356 // trap, and may be placed in a different (outer) loop, if the Allocate | |
1357 // is in a loop. If (this is rare) the inner loop gets unrolled, then | |
1358 // there can be two Allocates to one Initialize. The answer in all these | |
1359 // edge cases is safety first. It is always safe to clear immediately | |
1360 // within an Allocate, and then (maybe or maybe not) clear some more later. | |
1361 if (!ZeroTLAB) | |
1362 rawmem = ClearArrayNode::clear_memory(control, rawmem, object, | |
1363 header_size, size_in_bytes, | |
1364 &_igvn); | |
1365 } else { | |
1366 if (!init->is_complete()) { | |
1367 // Try to win by zeroing only what the init does not store. | |
1368 // We can also try to do some peephole optimizations, | |
1369 // such as combining some adjacent subword stores. | |
1370 rawmem = init->complete_stores(control, rawmem, object, | |
1371 header_size, size_in_bytes, &_igvn); | |
1372 } | |
1373 // We have no more use for this link, since the AllocateNode goes away: | |
1374 init->set_req(InitializeNode::RawAddress, top()); | |
1375 // (If we keep the link, it just confuses the register allocator, | |
1376 // who thinks he sees a real use of the address by the membar.) | |
1377 } | |
1378 | |
1379 return rawmem; | |
1380 } | |
1381 | |
1382 // Generate prefetch instructions for next allocations. | |
1383 Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false, | |
1384 Node*& contended_phi_rawmem, | |
1385 Node* old_eden_top, Node* new_eden_top, | |
1386 Node* length) { | |
1387 if( UseTLAB && AllocatePrefetchStyle == 2 ) { | |
1388 // Generate prefetch allocation with watermark check. | |
1389 // As an allocation hits the watermark, we will prefetch starting | |
1390 // at a "distance" away from watermark. | |
1391 enum { fall_in_path = 1, pf_path = 2 }; | |
1392 | |
1393 Node *pf_region = new (C, 3) RegionNode(3); | |
1394 Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY, | |
1395 TypeRawPtr::BOTTOM ); | |
1396 // I/O is used for Prefetch | |
1397 Node *pf_phi_abio = new (C, 3) PhiNode( pf_region, Type::ABIO ); | |
1398 | |
1399 Node *thread = new (C, 1) ThreadLocalNode(); | |
1400 transform_later(thread); | |
1401 | |
1402 Node *eden_pf_adr = new (C, 4) AddPNode( top()/*not oop*/, thread, | |
1403 _igvn.MakeConX(in_bytes(JavaThread::tlab_pf_top_offset())) ); | |
1404 transform_later(eden_pf_adr); | |
1405 | |
1406 Node *old_pf_wm = new (C, 3) LoadPNode( needgc_false, | |
1407 contended_phi_rawmem, eden_pf_adr, | |
1408 TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); | |
1409 transform_later(old_pf_wm); | |
1410 | |
1411 // check against new_eden_top | |
1412 Node *need_pf_cmp = new (C, 3) CmpPNode( new_eden_top, old_pf_wm ); | |
1413 transform_later(need_pf_cmp); | |
1414 Node *need_pf_bol = new (C, 2) BoolNode( need_pf_cmp, BoolTest::ge ); | |
1415 transform_later(need_pf_bol); | |
1416 IfNode *need_pf_iff = new (C, 2) IfNode( needgc_false, need_pf_bol, | |
1417 PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); | |
1418 transform_later(need_pf_iff); | |
1419 | |
1420 // true node, add prefetchdistance | |
1421 Node *need_pf_true = new (C, 1) IfTrueNode( need_pf_iff ); | |
1422 transform_later(need_pf_true); | |
1423 | |
1424 Node *need_pf_false = new (C, 1) IfFalseNode( need_pf_iff ); | |
1425 transform_later(need_pf_false); | |
1426 | |
1427 Node *new_pf_wmt = new (C, 4) AddPNode( top(), old_pf_wm, | |
1428 _igvn.MakeConX(AllocatePrefetchDistance) ); | |
1429 transform_later(new_pf_wmt ); | |
1430 new_pf_wmt->set_req(0, need_pf_true); | |
1431 | |
1432 Node *store_new_wmt = new (C, 4) StorePNode( need_pf_true, | |
1433 contended_phi_rawmem, eden_pf_adr, | |
1434 TypeRawPtr::BOTTOM, new_pf_wmt ); | |
1435 transform_later(store_new_wmt); | |
1436 | |
1437 // adding prefetches | |
1438 pf_phi_abio->init_req( fall_in_path, i_o ); | |
1439 | |
1440 Node *prefetch_adr; | |
1441 Node *prefetch; | |
1442 uint lines = AllocatePrefetchDistance / AllocatePrefetchStepSize; | |
1443 uint step_size = AllocatePrefetchStepSize; | |
1444 uint distance = 0; | |
1445 | |
1446 for ( uint i = 0; i < lines; i++ ) { | |
1447 prefetch_adr = new (C, 4) AddPNode( old_pf_wm, new_pf_wmt, | |
1448 _igvn.MakeConX(distance) ); | |
1449 transform_later(prefetch_adr); | |
1450 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1451 transform_later(prefetch); | |
1452 distance += step_size; | |
1453 i_o = prefetch; | |
1454 } | |
1455 pf_phi_abio->set_req( pf_path, i_o ); | |
1456 | |
1457 pf_region->init_req( fall_in_path, need_pf_false ); | |
1458 pf_region->init_req( pf_path, need_pf_true ); | |
1459 | |
1460 pf_phi_rawmem->init_req( fall_in_path, contended_phi_rawmem ); | |
1461 pf_phi_rawmem->init_req( pf_path, store_new_wmt ); | |
1462 | |
1463 transform_later(pf_region); | |
1464 transform_later(pf_phi_rawmem); | |
1465 transform_later(pf_phi_abio); | |
1466 | |
1467 needgc_false = pf_region; | |
1468 contended_phi_rawmem = pf_phi_rawmem; | |
1469 i_o = pf_phi_abio; | |
1470 } else if( AllocatePrefetchStyle > 0 ) { | |
1471 // Insert a prefetch for each allocation only on the fast-path | |
1472 Node *prefetch_adr; | |
1473 Node *prefetch; | |
1474 // Generate several prefetch instructions only for arrays. | |
1475 uint lines = (length != NULL) ? AllocatePrefetchLines : 1; | |
1476 uint step_size = AllocatePrefetchStepSize; | |
1477 uint distance = AllocatePrefetchDistance; | |
1478 for ( uint i = 0; i < lines; i++ ) { | |
1479 prefetch_adr = new (C, 4) AddPNode( old_eden_top, new_eden_top, | |
1480 _igvn.MakeConX(distance) ); | |
1481 transform_later(prefetch_adr); | |
1482 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1483 // Do not let it float too high, since if eden_top == eden_end, | |
1484 // both might be null. | |
1485 if( i == 0 ) { // Set control for first prefetch, next follows it | |
1486 prefetch->init_req(0, needgc_false); | |
1487 } | |
1488 transform_later(prefetch); | |
1489 distance += step_size; | |
1490 i_o = prefetch; | |
1491 } | |
1492 } | |
1493 return i_o; | |
1494 } | |
1495 | |
1496 | |
1497 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) { | |
1498 expand_allocate_common(alloc, NULL, | |
1499 OptoRuntime::new_instance_Type(), | |
1500 OptoRuntime::new_instance_Java()); | |
1501 } | |
1502 | |
1503 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) { | |
1504 Node* length = alloc->in(AllocateNode::ALength); | |
1505 expand_allocate_common(alloc, length, | |
1506 OptoRuntime::new_array_Type(), | |
1507 OptoRuntime::new_array_Java()); | |
1508 } | |
1509 | |
1510 | |
1511 // we have determined that this lock/unlock can be eliminated, we simply | |
1512 // eliminate the node without expanding it. | |
1513 // | |
1514 // Note: The membar's associated with the lock/unlock are currently not | |
1515 // eliminated. This should be investigated as a future enhancement. | |
1516 // | |
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1517 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) { |
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1518 |
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1519 if (!alock->is_eliminated()) { |
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1520 return false; |
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|
1521 } |
460
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1522 if (alock->is_Lock() && !alock->is_coarsened()) { |
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|
1523 // Create new "eliminated" BoxLock node and use it |
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1524 // in monitor debug info for the same object. |
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1525 BoxLockNode* oldbox = alock->box_node()->as_BoxLock(); |
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1526 Node* obj = alock->obj_node(); |
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1527 if (!oldbox->is_eliminated()) { |
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1528 BoxLockNode* newbox = oldbox->clone()->as_BoxLock(); |
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|
1529 newbox->set_eliminated(); |
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1530 transform_later(newbox); |
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1531 // Replace old box node with new box for all users |
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|
1532 // of the same object. |
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1533 for (uint i = 0; i < oldbox->outcnt();) { |
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1534 |
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|
1535 bool next_edge = true; |
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|
1536 Node* u = oldbox->raw_out(i); |
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1537 if (u == alock) { |
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|
1538 i++; |
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|
1539 continue; // It will be removed below |
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1540 } |
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1541 if (u->is_Lock() && |
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1542 u->as_Lock()->obj_node() == obj && |
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1543 // oldbox could be referenced in debug info also |
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1544 u->as_Lock()->box_node() == oldbox) { |
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1545 assert(u->as_Lock()->is_eliminated(), "sanity"); |
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|
1546 _igvn.hash_delete(u); |
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|
1547 u->set_req(TypeFunc::Parms + 1, newbox); |
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|
1548 next_edge = false; |
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|
1549 #ifdef ASSERT |
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1550 } else if (u->is_Unlock() && u->as_Unlock()->obj_node() == obj) { |
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1551 assert(u->as_Unlock()->is_eliminated(), "sanity"); |
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1552 #endif |
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1553 } |
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1554 // Replace old box in monitor debug info. |
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1555 if (u->is_SafePoint() && u->as_SafePoint()->jvms()) { |
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|
1556 SafePointNode* sfn = u->as_SafePoint(); |
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1557 JVMState* youngest_jvms = sfn->jvms(); |
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1558 int max_depth = youngest_jvms->depth(); |
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1559 for (int depth = 1; depth <= max_depth; depth++) { |
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1560 JVMState* jvms = youngest_jvms->of_depth(depth); |
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|
1561 int num_mon = jvms->nof_monitors(); |
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|
1562 // Loop over monitors |
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1563 for (int idx = 0; idx < num_mon; idx++) { |
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1564 Node* obj_node = sfn->monitor_obj(jvms, idx); |
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1565 Node* box_node = sfn->monitor_box(jvms, idx); |
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1566 if (box_node == oldbox && obj_node == obj) { |
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1567 int j = jvms->monitor_box_offset(idx); |
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1568 _igvn.hash_delete(u); |
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|
1569 u->set_req(j, newbox); |
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|
1570 next_edge = false; |
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|
1571 } |
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1572 } // for (int idx = 0; |
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1573 } // for (int depth = 1; |
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1574 } // if (u->is_SafePoint() |
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|
1575 if (next_edge) i++; |
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1576 } // for (uint i = 0; i < oldbox->outcnt();) |
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|
1577 } // if (!oldbox->is_eliminated()) |
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1578 } // if (alock->is_Lock() && !lock->is_coarsened()) |
66
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|
1579 |
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|
1580 #ifndef PRODUCT |
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|
1581 if (PrintEliminateLocks) { |
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|
1582 if (alock->is_Lock()) { |
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|
1583 tty->print_cr("++++ Eliminating: %d Lock", alock->_idx); |
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|
1584 } else { |
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|
1585 tty->print_cr("++++ Eliminating: %d Unlock", alock->_idx); |
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|
1586 } |
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|
1587 } |
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|
1588 #endif |
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|
1589 |
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|
1590 Node* mem = alock->in(TypeFunc::Memory); |
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|
1591 Node* ctrl = alock->in(TypeFunc::Control); |
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|
1592 |
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|
1593 extract_call_projections(alock); |
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|
1594 // There are 2 projections from the lock. The lock node will |
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|
1595 // be deleted when its last use is subsumed below. |
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|
1596 assert(alock->outcnt() == 2 && |
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|
1597 _fallthroughproj != NULL && |
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|
1598 _memproj_fallthrough != NULL, |
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|
1599 "Unexpected projections from Lock/Unlock"); |
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|
1600 |
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|
1601 Node* fallthroughproj = _fallthroughproj; |
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|
1602 Node* memproj_fallthrough = _memproj_fallthrough; |
0 | 1603 |
1604 // The memory projection from a lock/unlock is RawMem | |
1605 // The input to a Lock is merged memory, so extract its RawMem input | |
1606 // (unless the MergeMem has been optimized away.) | |
1607 if (alock->is_Lock()) { | |
66
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1608 // Seach for MemBarAcquire node and delete it also. |
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1609 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar(); |
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1610 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquire, ""); |
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1611 Node* ctrlproj = membar->proj_out(TypeFunc::Control); |
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1612 Node* memproj = membar->proj_out(TypeFunc::Memory); |
708
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1613 _igvn.replace_node(ctrlproj, fallthroughproj); |
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1614 _igvn.replace_node(memproj, memproj_fallthrough); |
460
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1615 |
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1616 // Delete FastLock node also if this Lock node is unique user |
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1617 // (a loop peeling may clone a Lock node). |
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1618 Node* flock = alock->as_Lock()->fastlock_node(); |
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1619 if (flock->outcnt() == 1) { |
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1620 assert(flock->unique_out() == alock, "sanity"); |
708
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1621 _igvn.replace_node(flock, top()); |
460
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1622 } |
0 | 1623 } |
1624 | |
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1625 // Seach for MemBarRelease node and delete it also. |
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1626 if (alock->is_Unlock() && ctrl != NULL && ctrl->is_Proj() && |
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1627 ctrl->in(0)->is_MemBar()) { |
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1628 MemBarNode* membar = ctrl->in(0)->as_MemBar(); |
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1629 assert(membar->Opcode() == Op_MemBarRelease && |
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1630 mem->is_Proj() && membar == mem->in(0), ""); |
708
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1631 _igvn.replace_node(fallthroughproj, ctrl); |
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|
1632 _igvn.replace_node(memproj_fallthrough, mem); |
66
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1633 fallthroughproj = ctrl; |
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|
1634 memproj_fallthrough = mem; |
6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
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diff
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|
1635 ctrl = membar->in(TypeFunc::Control); |
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diff
changeset
|
1636 mem = membar->in(TypeFunc::Memory); |
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63
diff
changeset
|
1637 } |
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63
diff
changeset
|
1638 |
708
f2049ae95c3d
6711117: Assertion in 64bit server vm (flat != TypePtr::BOTTOM,"cannot alias-analyze an untyped ptr")
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parents:
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diff
changeset
|
1639 _igvn.replace_node(fallthroughproj, ctrl); |
f2049ae95c3d
6711117: Assertion in 64bit server vm (flat != TypePtr::BOTTOM,"cannot alias-analyze an untyped ptr")
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diff
changeset
|
1640 _igvn.replace_node(memproj_fallthrough, mem); |
66
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diff
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|
1641 return true; |
0 | 1642 } |
1643 | |
1644 | |
1645 //------------------------------expand_lock_node---------------------- | |
1646 void PhaseMacroExpand::expand_lock_node(LockNode *lock) { | |
1647 | |
1648 Node* ctrl = lock->in(TypeFunc::Control); | |
1649 Node* mem = lock->in(TypeFunc::Memory); | |
1650 Node* obj = lock->obj_node(); | |
1651 Node* box = lock->box_node(); | |
66
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diff
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|
1652 Node* flock = lock->fastlock_node(); |
0 | 1653 |
1654 // Make the merge point | |
420
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
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|
1655 Node *region; |
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diff
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|
1656 Node *mem_phi; |
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diff
changeset
|
1657 Node *slow_path; |
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362
diff
changeset
|
1658 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1659 if (UseOptoBiasInlining) { |
a1980da045cc
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diff
changeset
|
1660 /* |
605 | 1661 * See the full description in MacroAssembler::biased_locking_enter(). |
420
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
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|
1662 * |
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|
1663 * if( (mark_word & biased_lock_mask) == biased_lock_pattern ) { |
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|
1664 * // The object is biased. |
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diff
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|
1665 * proto_node = klass->prototype_header; |
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diff
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|
1666 * o_node = thread | proto_node; |
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|
1667 * x_node = o_node ^ mark_word; |
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|
1668 * if( (x_node & ~age_mask) == 0 ) { // Biased to the current thread ? |
a1980da045cc
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|
1669 * // Done. |
a1980da045cc
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diff
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|
1670 * } else { |
a1980da045cc
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|
1671 * if( (x_node & biased_lock_mask) != 0 ) { |
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|
1672 * // The klass's prototype header is no longer biased. |
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|
1673 * cas(&mark_word, mark_word, proto_node) |
a1980da045cc
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diff
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|
1674 * goto cas_lock; |
a1980da045cc
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diff
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|
1675 * } else { |
a1980da045cc
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|
1676 * // The klass's prototype header is still biased. |
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|
1677 * if( (x_node & epoch_mask) != 0 ) { // Expired epoch? |
a1980da045cc
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|
1678 * old = mark_word; |
a1980da045cc
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diff
changeset
|
1679 * new = o_node; |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1680 * } else { |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1681 * // Different thread or anonymous biased. |
a1980da045cc
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|
1682 * old = mark_word & (epoch_mask | age_mask | biased_lock_mask); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
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|
1683 * new = thread | old; |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1684 * } |
a1980da045cc
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diff
changeset
|
1685 * // Try to rebias. |
a1980da045cc
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|
1686 * if( cas(&mark_word, old, new) == 0 ) { |
a1980da045cc
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|
1687 * // Done. |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1688 * } else { |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1689 * goto slow_path; // Failed. |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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362
diff
changeset
|
1690 * } |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1691 * } |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
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diff
changeset
|
1692 * } |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
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diff
changeset
|
1693 * } else { |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1694 * // The object is not biased. |
a1980da045cc
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diff
changeset
|
1695 * cas_lock: |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
362
diff
changeset
|
1696 * if( FastLock(obj) == 0 ) { |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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362
diff
changeset
|
1697 * // Done. |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
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diff
changeset
|
1698 * } else { |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
362
diff
changeset
|
1699 * slow_path: |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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362
diff
changeset
|
1700 * OptoRuntime::complete_monitor_locking_Java(obj); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
362
diff
changeset
|
1701 * } |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
362
diff
changeset
|
1702 * } |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
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diff
changeset
|
1703 */ |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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362
diff
changeset
|
1704 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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362
diff
changeset
|
1705 region = new (C, 5) RegionNode(5); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
362
diff
changeset
|
1706 // create a Phi for the memory state |
a1980da045cc
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diff
changeset
|
1707 mem_phi = new (C, 5) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1708 |
a1980da045cc
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diff
changeset
|
1709 Node* fast_lock_region = new (C, 3) RegionNode(3); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1710 Node* fast_lock_mem_phi = new (C, 3) PhiNode( fast_lock_region, Type::MEMORY, TypeRawPtr::BOTTOM); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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362
diff
changeset
|
1711 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1712 // First, check mark word for the biased lock pattern. |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
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|
1713 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1714 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1715 // Get fast path - mark word has the biased lock pattern. |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1716 ctrl = opt_bits_test(ctrl, fast_lock_region, 1, mark_node, |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1717 markOopDesc::biased_lock_mask_in_place, |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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362
diff
changeset
|
1718 markOopDesc::biased_lock_pattern, true); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1719 // fast_lock_region->in(1) is set to slow path. |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1720 fast_lock_mem_phi->init_req(1, mem); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
362
diff
changeset
|
1721 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1722 // Now check that the lock is biased to the current thread and has |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1723 // the same epoch and bias as Klass::_prototype_header. |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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362
diff
changeset
|
1724 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1725 // Special-case a fresh allocation to avoid building nodes: |
a1980da045cc
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diff
changeset
|
1726 Node* klass_node = AllocateNode::Ideal_klass(obj, &_igvn); |
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6462850: generate biased locking code in C2 ideal graph
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diff
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|
1727 if (klass_node == NULL) { |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
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|
1728 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); |
a1980da045cc
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|
1729 klass_node = transform_later( LoadKlassNode::make(_igvn, mem, k_adr, _igvn.type(k_adr)->is_ptr()) ); |
490
dd70dd4c91de
6782820: Server VM fails with "unhandled implicit exception in compiled code"
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460
diff
changeset
|
1730 #ifdef _LP64 |
dd70dd4c91de
6782820: Server VM fails with "unhandled implicit exception in compiled code"
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460
diff
changeset
|
1731 if (UseCompressedOops && klass_node->is_DecodeN()) { |
dd70dd4c91de
6782820: Server VM fails with "unhandled implicit exception in compiled code"
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parents:
460
diff
changeset
|
1732 assert(klass_node->in(1)->Opcode() == Op_LoadNKlass, "sanity"); |
dd70dd4c91de
6782820: Server VM fails with "unhandled implicit exception in compiled code"
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changeset
|
1733 klass_node->in(1)->init_req(0, ctrl); |
dd70dd4c91de
6782820: Server VM fails with "unhandled implicit exception in compiled code"
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parents:
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diff
changeset
|
1734 } else |
dd70dd4c91de
6782820: Server VM fails with "unhandled implicit exception in compiled code"
kvn
parents:
460
diff
changeset
|
1735 #endif |
dd70dd4c91de
6782820: Server VM fails with "unhandled implicit exception in compiled code"
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diff
changeset
|
1736 klass_node->init_req(0, ctrl); |
420
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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362
diff
changeset
|
1737 } |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1738 Node *proto_node = make_load(ctrl, mem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeX_X, TypeX_X->basic_type()); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1739 |
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6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1740 Node* thread = transform_later(new (C, 1) ThreadLocalNode()); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1741 Node* cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread)); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
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|
1742 Node* o_node = transform_later(new (C, 3) OrXNode(cast_thread, proto_node)); |
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diff
changeset
|
1743 Node* x_node = transform_later(new (C, 3) XorXNode(o_node, mark_node)); |
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362
diff
changeset
|
1744 |
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6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1745 // Get slow path - mark word does NOT match the value. |
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diff
changeset
|
1746 Node* not_biased_ctrl = opt_bits_test(ctrl, region, 3, x_node, |
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diff
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|
1747 (~markOopDesc::age_mask_in_place), 0); |
a1980da045cc
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diff
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|
1748 // region->in(3) is set to fast path - the object is biased to the current thread. |
a1980da045cc
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diff
changeset
|
1749 mem_phi->init_req(3, mem); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1750 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1751 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
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|
1752 // Mark word does NOT match the value (thread | Klass::_prototype_header). |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
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|
1753 |
0 | 1754 |
420
a1980da045cc
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diff
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|
1755 // First, check biased pattern. |
a1980da045cc
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diff
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|
1756 // Get fast path - _prototype_header has the same biased lock pattern. |
a1980da045cc
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diff
changeset
|
1757 ctrl = opt_bits_test(not_biased_ctrl, fast_lock_region, 2, x_node, |
a1980da045cc
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diff
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|
1758 markOopDesc::biased_lock_mask_in_place, 0, true); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1759 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
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|
1760 not_biased_ctrl = fast_lock_region->in(2); // Slow path |
a1980da045cc
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diff
changeset
|
1761 // fast_lock_region->in(2) - the prototype header is no longer biased |
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diff
changeset
|
1762 // and we have to revoke the bias on this object. |
a1980da045cc
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diff
changeset
|
1763 // We are going to try to reset the mark of this object to the prototype |
a1980da045cc
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diff
changeset
|
1764 // value and fall through to the CAS-based locking scheme. |
a1980da045cc
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diff
changeset
|
1765 Node* adr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes()); |
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diff
changeset
|
1766 Node* cas = new (C, 5) StoreXConditionalNode(not_biased_ctrl, mem, adr, |
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362
diff
changeset
|
1767 proto_node, mark_node); |
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diff
changeset
|
1768 transform_later(cas); |
a1980da045cc
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diff
changeset
|
1769 Node* proj = transform_later( new (C, 1) SCMemProjNode(cas)); |
a1980da045cc
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diff
changeset
|
1770 fast_lock_mem_phi->init_req(2, proj); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1771 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1772 |
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362
diff
changeset
|
1773 // Second, check epoch bits. |
a1980da045cc
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diff
changeset
|
1774 Node* rebiased_region = new (C, 3) RegionNode(3); |
a1980da045cc
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diff
changeset
|
1775 Node* old_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1776 Node* new_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X); |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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parents:
362
diff
changeset
|
1777 |
a1980da045cc
6462850: generate biased locking code in C2 ideal graph
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diff
changeset
|
1778 // Get slow path - mark word does NOT match epoch bits. |
a1980da045cc
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diff
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|
1779 Node* epoch_ctrl = opt_bits_test(ctrl, rebiased_region, 1, x_node, |
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1780 markOopDesc::epoch_mask_in_place, 0); |
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1781 // The epoch of the current bias is not valid, attempt to rebias the object |
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1782 // toward the current thread. |
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1783 rebiased_region->init_req(2, epoch_ctrl); |
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1784 old_phi->init_req(2, mark_node); |
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1785 new_phi->init_req(2, o_node); |
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1786 |
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1787 // rebiased_region->in(1) is set to fast path. |
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1788 // The epoch of the current bias is still valid but we know |
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1789 // nothing about the owner; it might be set or it might be clear. |
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1790 Node* cmask = MakeConX(markOopDesc::biased_lock_mask_in_place | |
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1791 markOopDesc::age_mask_in_place | |
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1792 markOopDesc::epoch_mask_in_place); |
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1793 Node* old = transform_later(new (C, 3) AndXNode(mark_node, cmask)); |
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1794 cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread)); |
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1795 Node* new_mark = transform_later(new (C, 3) OrXNode(cast_thread, old)); |
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1796 old_phi->init_req(1, old); |
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1797 new_phi->init_req(1, new_mark); |
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1798 |
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1799 transform_later(rebiased_region); |
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1800 transform_later(old_phi); |
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1801 transform_later(new_phi); |
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1802 |
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1803 // Try to acquire the bias of the object using an atomic operation. |
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1804 // If this fails we will go in to the runtime to revoke the object's bias. |
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1805 cas = new (C, 5) StoreXConditionalNode(rebiased_region, mem, adr, |
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1806 new_phi, old_phi); |
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1807 transform_later(cas); |
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1808 proj = transform_later( new (C, 1) SCMemProjNode(cas)); |
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1809 |
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1810 // Get slow path - Failed to CAS. |
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1811 not_biased_ctrl = opt_bits_test(rebiased_region, region, 4, cas, 0, 0); |
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1812 mem_phi->init_req(4, proj); |
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1813 // region->in(4) is set to fast path - the object is rebiased to the current thread. |
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1814 |
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1815 // Failed to CAS. |
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1816 slow_path = new (C, 3) RegionNode(3); |
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1817 Node *slow_mem = new (C, 3) PhiNode( slow_path, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1818 |
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1819 slow_path->init_req(1, not_biased_ctrl); // Capture slow-control |
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1820 slow_mem->init_req(1, proj); |
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1821 |
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1822 // Call CAS-based locking scheme (FastLock node). |
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1823 |
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1824 transform_later(fast_lock_region); |
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1825 transform_later(fast_lock_mem_phi); |
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1826 |
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1827 // Get slow path - FastLock failed to lock the object. |
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1828 ctrl = opt_bits_test(fast_lock_region, region, 2, flock, 0, 0); |
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1829 mem_phi->init_req(2, fast_lock_mem_phi); |
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1830 // region->in(2) is set to fast path - the object is locked to the current thread. |
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1831 |
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1832 slow_path->init_req(2, ctrl); // Capture slow-control |
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1833 slow_mem->init_req(2, fast_lock_mem_phi); |
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1834 |
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1835 transform_later(slow_path); |
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1836 transform_later(slow_mem); |
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1837 // Reset lock's memory edge. |
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1838 lock->set_req(TypeFunc::Memory, slow_mem); |
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1839 |
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1840 } else { |
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1841 region = new (C, 3) RegionNode(3); |
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1842 // create a Phi for the memory state |
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1843 mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1844 |
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1845 // Optimize test; set region slot 2 |
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1846 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0); |
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1847 mem_phi->init_req(2, mem); |
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1848 } |
0 | 1849 |
1850 // Make slow path call | |
1851 CallNode *call = make_slow_call( (CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(), OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path, obj, box ); | |
1852 | |
1853 extract_call_projections(call); | |
1854 | |
1855 // Slow path can only throw asynchronous exceptions, which are always | |
1856 // de-opted. So the compiler thinks the slow-call can never throw an | |
1857 // exception. If it DOES throw an exception we would need the debug | |
1858 // info removed first (since if it throws there is no monitor). | |
1859 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
1860 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
1861 | |
1862 // Capture slow path | |
1863 // disconnect fall-through projection from call and create a new one | |
1864 // hook up users of fall-through projection to region | |
1865 Node *slow_ctrl = _fallthroughproj->clone(); | |
1866 transform_later(slow_ctrl); | |
1867 _igvn.hash_delete(_fallthroughproj); | |
1868 _fallthroughproj->disconnect_inputs(NULL); | |
1869 region->init_req(1, slow_ctrl); | |
1870 // region inputs are now complete | |
1871 transform_later(region); | |
708
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1872 _igvn.replace_node(_fallthroughproj, region); |
0 | 1873 |
420
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1874 Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) ); |
0 | 1875 mem_phi->init_req(1, memproj ); |
1876 transform_later(mem_phi); | |
708
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1877 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 1878 } |
1879 | |
1880 //------------------------------expand_unlock_node---------------------- | |
1881 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) { | |
1882 | |
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1883 Node* ctrl = unlock->in(TypeFunc::Control); |
0 | 1884 Node* mem = unlock->in(TypeFunc::Memory); |
1885 Node* obj = unlock->obj_node(); | |
1886 Node* box = unlock->box_node(); | |
1887 | |
1888 // No need for a null check on unlock | |
1889 | |
1890 // Make the merge point | |
420
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1891 Node *region; |
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1892 Node *mem_phi; |
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1893 |
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1894 if (UseOptoBiasInlining) { |
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1895 // Check for biased locking unlock case, which is a no-op. |
605 | 1896 // See the full description in MacroAssembler::biased_locking_exit(). |
420
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1897 region = new (C, 4) RegionNode(4); |
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1898 // create a Phi for the memory state |
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1899 mem_phi = new (C, 4) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1900 mem_phi->init_req(3, mem); |
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1901 |
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1902 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type()); |
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1903 ctrl = opt_bits_test(ctrl, region, 3, mark_node, |
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1904 markOopDesc::biased_lock_mask_in_place, |
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1905 markOopDesc::biased_lock_pattern); |
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1906 } else { |
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1907 region = new (C, 3) RegionNode(3); |
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1908 // create a Phi for the memory state |
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1909 mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); |
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1910 } |
0 | 1911 |
1912 FastUnlockNode *funlock = new (C, 3) FastUnlockNode( ctrl, obj, box ); | |
1913 funlock = transform_later( funlock )->as_FastUnlock(); | |
1914 // Optimize test; set region slot 2 | |
420
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1915 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0); |
0 | 1916 |
1917 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 ); | |
1918 | |
1919 extract_call_projections(call); | |
1920 | |
1921 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
1922 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
1923 | |
1924 // No exceptions for unlocking | |
1925 // Capture slow path | |
1926 // disconnect fall-through projection from call and create a new one | |
1927 // hook up users of fall-through projection to region | |
1928 Node *slow_ctrl = _fallthroughproj->clone(); | |
1929 transform_later(slow_ctrl); | |
1930 _igvn.hash_delete(_fallthroughproj); | |
1931 _fallthroughproj->disconnect_inputs(NULL); | |
1932 region->init_req(1, slow_ctrl); | |
1933 // region inputs are now complete | |
1934 transform_later(region); | |
708
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1935 _igvn.replace_node(_fallthroughproj, region); |
0 | 1936 |
1937 Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) ); | |
1938 mem_phi->init_req(1, memproj ); | |
1939 mem_phi->init_req(2, mem); | |
1940 transform_later(mem_phi); | |
708
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1941 _igvn.replace_node(_memproj_fallthrough, mem_phi); |
0 | 1942 } |
1943 | |
1944 //------------------------------expand_macro_nodes---------------------- | |
1945 // Returns true if a failure occurred. | |
1946 bool PhaseMacroExpand::expand_macro_nodes() { | |
1947 if (C->macro_count() == 0) | |
1948 return false; | |
460
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1949 // First, attempt to eliminate locks |
73
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1950 bool progress = true; |
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1951 while (progress) { |
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1952 progress = false; |
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1953 for (int i = C->macro_count(); i > 0; i--) { |
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1954 Node * n = C->macro_node(i-1); |
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1955 bool success = false; |
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1956 debug_only(int old_macro_count = C->macro_count();); |
460
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1957 if (n->is_AbstractLock()) { |
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1958 success = eliminate_locking_node(n->as_AbstractLock()); |
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1959 } else if (n->Opcode() == Op_Opaque1 || n->Opcode() == Op_Opaque2) { |
708
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1960 _igvn.replace_node(n, n->in(1)); |
460
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1961 success = true; |
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1962 } |
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1963 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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1964 progress = progress || success; |
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1965 } |
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1966 } |
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1967 // Next, attempt to eliminate allocations |
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1968 progress = true; |
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1969 while (progress) { |
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1970 progress = false; |
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1971 for (int i = C->macro_count(); i > 0; i--) { |
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1972 Node * n = C->macro_node(i-1); |
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1973 bool success = false; |
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1974 debug_only(int old_macro_count = C->macro_count();); |
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1975 switch (n->class_id()) { |
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1976 case Node::Class_Allocate: |
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1977 case Node::Class_AllocateArray: |
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1978 success = eliminate_allocate_node(n->as_Allocate()); |
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1979 break; |
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1980 case Node::Class_Lock: |
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1981 case Node::Class_Unlock: |
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1982 assert(!n->as_AbstractLock()->is_eliminated(), "sanity"); |
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1983 break; |
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1984 default: |
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1985 assert(false, "unknown node type in macro list"); |
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1986 } |
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1987 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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1988 progress = progress || success; |
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1989 } |
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1990 } |
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1991 // Make sure expansion will not cause node limit to be exceeded. |
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1992 // Worst case is a macro node gets expanded into about 50 nodes. |
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1993 // Allow 50% more for optimization. |
0 | 1994 if (C->check_node_count(C->macro_count() * 75, "out of nodes before macro expansion" ) ) |
1995 return true; | |
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1996 |
0 | 1997 // expand "macro" nodes |
1998 // nodes are removed from the macro list as they are processed | |
1999 while (C->macro_count() > 0) { | |
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2000 int macro_count = C->macro_count(); |
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2001 Node * n = C->macro_node(macro_count-1); |
0 | 2002 assert(n->is_macro(), "only macro nodes expected here"); |
2003 if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) { | |
2004 // node is unreachable, so don't try to expand it | |
2005 C->remove_macro_node(n); | |
2006 continue; | |
2007 } | |
2008 switch (n->class_id()) { | |
2009 case Node::Class_Allocate: | |
2010 expand_allocate(n->as_Allocate()); | |
2011 break; | |
2012 case Node::Class_AllocateArray: | |
2013 expand_allocate_array(n->as_AllocateArray()); | |
2014 break; | |
2015 case Node::Class_Lock: | |
2016 expand_lock_node(n->as_Lock()); | |
2017 break; | |
2018 case Node::Class_Unlock: | |
2019 expand_unlock_node(n->as_Unlock()); | |
2020 break; | |
2021 default: | |
2022 assert(false, "unknown node type in macro list"); | |
2023 } | |
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2024 assert(C->macro_count() < macro_count, "must have deleted a node from macro list"); |
0 | 2025 if (C->failing()) return true; |
2026 } | |
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2027 |
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2028 _igvn.set_delay_transform(false); |
0 | 2029 _igvn.optimize(); |
2030 return false; | |
2031 } |