Mercurial > hg > graal-compiler
annotate src/share/vm/opto/macro.cpp @ 73:a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
Summary: Use scalar replacement with EA to remove allocations for objects which do not escape the compiled method.
Reviewed-by: rasbold, never, jrose
author | kvn |
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date | Thu, 20 Mar 2008 13:51:55 -0700 |
parents | 6dbf1a175d6b |
children | ba764ed4b6f2 |
rev | line source |
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0 | 1 /* |
2 * Copyright 2005-2007 Sun Microsystems, Inc. All Rights Reserved. | |
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->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 = transform_later(new_in); // Register new node. |
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68 } |
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69 old_in = new_in; |
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70 } |
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71 newcall->add_req(old_in); |
0 | 72 } |
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73 |
0 | 74 newcall->set_jvms(oldcall->jvms()); |
75 for (JVMState *jvms = newcall->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
76 jvms->set_map(newcall); | |
77 jvms->set_locoff(jvms->locoff()+jvms_adj); | |
78 jvms->set_stkoff(jvms->stkoff()+jvms_adj); | |
79 jvms->set_monoff(jvms->monoff()+jvms_adj); | |
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80 jvms->set_scloff(jvms->scloff()+jvms_adj); |
0 | 81 jvms->set_endoff(jvms->endoff()+jvms_adj); |
82 } | |
83 } | |
84 | |
85 Node* PhaseMacroExpand::opt_iff(Node* region, Node* iff) { | |
86 IfNode *opt_iff = transform_later(iff)->as_If(); | |
87 | |
88 // Fast path taken; set region slot 2 | |
89 Node *fast_taken = transform_later( new (C, 1) IfFalseNode(opt_iff) ); | |
90 region->init_req(2,fast_taken); // Capture fast-control | |
91 | |
92 // Fast path not-taken, i.e. slow path | |
93 Node *slow_taken = transform_later( new (C, 1) IfTrueNode(opt_iff) ); | |
94 return slow_taken; | |
95 } | |
96 | |
97 //--------------------copy_predefined_input_for_runtime_call-------------------- | |
98 void PhaseMacroExpand::copy_predefined_input_for_runtime_call(Node * ctrl, CallNode* oldcall, CallNode* call) { | |
99 // Set fixed predefined input arguments | |
100 call->init_req( TypeFunc::Control, ctrl ); | |
101 call->init_req( TypeFunc::I_O , oldcall->in( TypeFunc::I_O) ); | |
102 call->init_req( TypeFunc::Memory , oldcall->in( TypeFunc::Memory ) ); // ????? | |
103 call->init_req( TypeFunc::ReturnAdr, oldcall->in( TypeFunc::ReturnAdr ) ); | |
104 call->init_req( TypeFunc::FramePtr, oldcall->in( TypeFunc::FramePtr ) ); | |
105 } | |
106 | |
107 //------------------------------make_slow_call--------------------------------- | |
108 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) { | |
109 | |
110 // Slow-path call | |
111 int size = slow_call_type->domain()->cnt(); | |
112 CallNode *call = leaf_name | |
113 ? (CallNode*)new (C, size) CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM ) | |
114 : (CallNode*)new (C, size) CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), oldcall->jvms()->bci(), TypeRawPtr::BOTTOM ); | |
115 | |
116 // Slow path call has no side-effects, uses few values | |
117 copy_predefined_input_for_runtime_call(slow_path, oldcall, call ); | |
118 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0); | |
119 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1); | |
120 copy_call_debug_info(oldcall, call); | |
121 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
122 _igvn.hash_delete(oldcall); | |
123 _igvn.subsume_node(oldcall, call); | |
124 transform_later(call); | |
125 | |
126 return call; | |
127 } | |
128 | |
129 void PhaseMacroExpand::extract_call_projections(CallNode *call) { | |
130 _fallthroughproj = NULL; | |
131 _fallthroughcatchproj = NULL; | |
132 _ioproj_fallthrough = NULL; | |
133 _ioproj_catchall = NULL; | |
134 _catchallcatchproj = NULL; | |
135 _memproj_fallthrough = NULL; | |
136 _memproj_catchall = NULL; | |
137 _resproj = NULL; | |
138 for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) { | |
139 ProjNode *pn = call->fast_out(i)->as_Proj(); | |
140 switch (pn->_con) { | |
141 case TypeFunc::Control: | |
142 { | |
143 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj | |
144 _fallthroughproj = pn; | |
145 DUIterator_Fast jmax, j = pn->fast_outs(jmax); | |
146 const Node *cn = pn->fast_out(j); | |
147 if (cn->is_Catch()) { | |
148 ProjNode *cpn = NULL; | |
149 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) { | |
150 cpn = cn->fast_out(k)->as_Proj(); | |
151 assert(cpn->is_CatchProj(), "must be a CatchProjNode"); | |
152 if (cpn->_con == CatchProjNode::fall_through_index) | |
153 _fallthroughcatchproj = cpn; | |
154 else { | |
155 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index."); | |
156 _catchallcatchproj = cpn; | |
157 } | |
158 } | |
159 } | |
160 break; | |
161 } | |
162 case TypeFunc::I_O: | |
163 if (pn->_is_io_use) | |
164 _ioproj_catchall = pn; | |
165 else | |
166 _ioproj_fallthrough = pn; | |
167 break; | |
168 case TypeFunc::Memory: | |
169 if (pn->_is_io_use) | |
170 _memproj_catchall = pn; | |
171 else | |
172 _memproj_fallthrough = pn; | |
173 break; | |
174 case TypeFunc::Parms: | |
175 _resproj = pn; | |
176 break; | |
177 default: | |
178 assert(false, "unexpected projection from allocation node."); | |
179 } | |
180 } | |
181 | |
182 } | |
183 | |
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184 // Eliminate a card mark sequence. p2x is a ConvP2XNode |
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185 void PhaseMacroExpand::eliminate_card_mark(Node *p2x) { |
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186 assert(p2x->Opcode() == Op_CastP2X, "ConvP2XNode required"); |
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187 Node *shift = p2x->unique_out(); |
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188 Node *addp = shift->unique_out(); |
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189 for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) { |
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190 Node *st = addp->last_out(j); |
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191 assert(st->is_Store(), "store required"); |
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192 _igvn.replace_node(st, st->in(MemNode::Memory)); |
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193 } |
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194 } |
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195 |
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196 // Search for a memory operation for the specified memory slice. |
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197 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc) { |
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198 Node *orig_mem = mem; |
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199 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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200 while (true) { |
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201 if (mem == alloc_mem || mem == start_mem ) { |
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202 return mem; // hit one of our sentinals |
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203 } else if (mem->is_MergeMem()) { |
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204 mem = mem->as_MergeMem()->memory_at(alias_idx); |
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205 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) { |
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206 Node *in = mem->in(0); |
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207 // we can safely skip over safepoints, calls, locks and membars because we |
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208 // already know that the object is safe to eliminate. |
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209 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) { |
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210 return in; |
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211 } else if (in->is_Call() || in->is_MemBar()) { |
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212 mem = in->in(TypeFunc::Memory); |
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213 } else { |
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214 assert(false, "unexpected projection"); |
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215 } |
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216 } else if (mem->is_Store()) { |
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217 const TypePtr* atype = mem->as_Store()->adr_type(); |
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218 int adr_idx = Compile::current()->get_alias_index(atype); |
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219 if (adr_idx == alias_idx) { |
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220 assert(atype->isa_oopptr(), "address type must be oopptr"); |
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221 int adr_offset = atype->offset(); |
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222 uint adr_iid = atype->is_oopptr()->instance_id(); |
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223 // Array elements references have the same alias_idx |
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224 // but different offset and different instance_id. |
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225 if (adr_offset == offset && adr_iid == alloc->_idx) |
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226 return mem; |
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227 } else { |
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228 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw"); |
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229 } |
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230 mem = mem->in(MemNode::Memory); |
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231 } else { |
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232 return mem; |
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233 } |
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234 if (mem == orig_mem) |
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235 return mem; |
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236 } |
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237 } |
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238 |
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239 // |
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240 // Given a Memory Phi, compute a value Phi containing the values from stores |
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241 // on the input paths. |
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242 // Note: this function is recursive, its depth is limied by the "level" argument |
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243 // Returns the computed Phi, or NULL if it cannot compute it. |
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244 Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *phi_type, const TypeOopPtr *adr_t, Node *alloc, int level) { |
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245 |
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246 if (level <= 0) { |
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247 return NULL; |
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248 } |
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249 int alias_idx = C->get_alias_index(adr_t); |
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250 int offset = adr_t->offset(); |
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251 int instance_id = adr_t->instance_id(); |
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252 |
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253 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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254 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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255 |
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256 uint length = mem->req(); |
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257 GrowableArray <Node *> values(length, length, NULL); |
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258 |
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259 for (uint j = 1; j < length; j++) { |
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260 Node *in = mem->in(j); |
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261 if (in == NULL || in->is_top()) { |
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262 values.at_put(j, in); |
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263 } else { |
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264 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc); |
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265 if (val == start_mem || val == alloc_mem) { |
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266 // hit a sentinel, return appropriate 0 value |
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267 values.at_put(j, _igvn.zerocon(ft)); |
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268 continue; |
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269 } |
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270 if (val->is_Initialize()) { |
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271 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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272 } |
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273 if (val == NULL) { |
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274 return NULL; // can't find a value on this path |
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275 } |
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276 if (val == mem) { |
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277 values.at_put(j, mem); |
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278 } else if (val->is_Store()) { |
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279 values.at_put(j, val->in(MemNode::ValueIn)); |
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280 } else if(val->is_Proj() && val->in(0) == alloc) { |
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281 values.at_put(j, _igvn.zerocon(ft)); |
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282 } else if (val->is_Phi()) { |
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283 // Check if an appropriate node already exists. |
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284 Node* region = val->in(0); |
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285 Node* old_phi = NULL; |
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286 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) { |
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287 Node* phi = region->fast_out(k); |
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288 if (phi->is_Phi() && phi != val && |
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289 phi->as_Phi()->is_same_inst_field(phi_type, instance_id, alias_idx, offset)) { |
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290 old_phi = phi; |
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291 break; |
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292 } |
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293 } |
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294 if (old_phi == NULL) { |
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295 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, level-1); |
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296 if (val == NULL) { |
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297 return NULL; |
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298 } |
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299 values.at_put(j, val); |
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300 } else { |
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301 values.at_put(j, old_phi); |
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302 } |
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303 } else { |
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304 return NULL; // unknown node on this path |
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305 } |
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306 } |
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307 } |
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308 // create a new Phi for the value |
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309 PhiNode *phi = new (C, length) PhiNode(mem->in(0), phi_type, NULL, instance_id, alias_idx, offset); |
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310 for (uint j = 1; j < length; j++) { |
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311 if (values.at(j) == mem) { |
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312 phi->init_req(j, phi); |
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313 } else { |
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314 phi->init_req(j, values.at(j)); |
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315 } |
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316 } |
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317 transform_later(phi); |
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318 return phi; |
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319 } |
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320 |
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321 // Search the last value stored into the object's field. |
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322 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc) { |
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323 assert(adr_t->is_instance_field(), "instance required"); |
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324 uint instance_id = adr_t->instance_id(); |
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325 assert(instance_id == alloc->_idx, "wrong allocation"); |
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326 |
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327 int alias_idx = C->get_alias_index(adr_t); |
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328 int offset = adr_t->offset(); |
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329 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
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330 Node *alloc_ctrl = alloc->in(TypeFunc::Control); |
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331 Node *alloc_mem = alloc->in(TypeFunc::Memory); |
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332 VectorSet visited(Thread::current()->resource_area()); |
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333 |
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334 |
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335 bool done = sfpt_mem == alloc_mem; |
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336 Node *mem = sfpt_mem; |
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337 while (!done) { |
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338 if (visited.test_set(mem->_idx)) { |
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339 return NULL; // found a loop, give up |
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340 } |
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341 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc); |
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342 if (mem == start_mem || mem == alloc_mem) { |
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343 done = true; // hit a sentinel, return appropriate 0 value |
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344 } else if (mem->is_Initialize()) { |
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345 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn); |
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346 if (mem == NULL) { |
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347 done = true; // Something go wrong. |
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348 } else if (mem->is_Store()) { |
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349 const TypePtr* atype = mem->as_Store()->adr_type(); |
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350 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice"); |
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351 done = true; |
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352 } |
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353 } else if (mem->is_Store()) { |
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354 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr(); |
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355 assert(atype != NULL, "address type must be oopptr"); |
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356 assert(C->get_alias_index(atype) == alias_idx && |
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357 atype->is_instance_field() && atype->offset() == offset && |
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358 atype->instance_id() == instance_id, "store is correct memory slice"); |
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359 done = true; |
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360 } else if (mem->is_Phi()) { |
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361 // try to find a phi's unique input |
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362 Node *unique_input = NULL; |
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363 Node *top = C->top(); |
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364 for (uint i = 1; i < mem->req(); i++) { |
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365 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc); |
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366 if (n == NULL || n == top || n == mem) { |
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367 continue; |
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368 } else if (unique_input == NULL) { |
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369 unique_input = n; |
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370 } else if (unique_input != n) { |
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371 unique_input = top; |
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372 break; |
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373 } |
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374 } |
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375 if (unique_input != NULL && unique_input != top) { |
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376 mem = unique_input; |
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377 } else { |
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378 done = true; |
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379 } |
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380 } else { |
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381 assert(false, "unexpected node"); |
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382 } |
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383 } |
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384 if (mem != NULL) { |
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385 if (mem == start_mem || mem == alloc_mem) { |
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386 // hit a sentinel, return appropriate 0 value |
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387 return _igvn.zerocon(ft); |
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388 } else if (mem->is_Store()) { |
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389 return mem->in(MemNode::ValueIn); |
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390 } else if (mem->is_Phi()) { |
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391 // attempt to produce a Phi reflecting the values on the input paths of the Phi |
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392 Node * phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, 8); |
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393 if (phi != NULL) { |
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394 return phi; |
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395 } |
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396 } |
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397 } |
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398 // Something go wrong. |
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399 return NULL; |
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400 } |
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401 |
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402 // Check the possibility of scalar replacement. |
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403 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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404 // Scan the uses of the allocation to check for anything that would |
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405 // prevent us from eliminating it. |
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406 NOT_PRODUCT( const char* fail_eliminate = NULL; ) |
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407 DEBUG_ONLY( Node* disq_node = NULL; ) |
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408 bool can_eliminate = true; |
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409 |
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410 Node* res = alloc->result_cast(); |
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411 const TypeOopPtr* res_type = NULL; |
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412 if (res == NULL) { |
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413 // All users were eliminated. |
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414 } else if (!res->is_CheckCastPP()) { |
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415 alloc->_is_scalar_replaceable = false; // don't try again |
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416 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";) |
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417 can_eliminate = false; |
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418 } else { |
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419 res_type = _igvn.type(res)->isa_oopptr(); |
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420 if (res_type == NULL) { |
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421 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";) |
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422 can_eliminate = false; |
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423 } else if (res_type->isa_aryptr()) { |
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424 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
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425 if (length < 0) { |
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426 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";) |
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427 can_eliminate = false; |
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428 } |
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429 } |
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430 } |
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431 |
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432 if (can_eliminate && res != NULL) { |
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433 for (DUIterator_Fast jmax, j = res->fast_outs(jmax); |
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434 j < jmax && can_eliminate; j++) { |
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435 Node* use = res->fast_out(j); |
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436 |
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437 if (use->is_AddP()) { |
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438 const TypePtr* addp_type = _igvn.type(use)->is_ptr(); |
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439 int offset = addp_type->offset(); |
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440 |
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441 if (offset == Type::OffsetTop || offset == Type::OffsetBot) { |
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442 NOT_PRODUCT(fail_eliminate = "Undefined field referrence";) |
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443 can_eliminate = false; |
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444 break; |
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|
445 } |
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446 for (DUIterator_Fast kmax, k = use->fast_outs(kmax); |
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447 k < kmax && can_eliminate; k++) { |
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448 Node* n = use->fast_out(k); |
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449 if (!n->is_Store() && n->Opcode() != Op_CastP2X) { |
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450 DEBUG_ONLY(disq_node = n;) |
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451 if (n->is_Load()) { |
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452 NOT_PRODUCT(fail_eliminate = "Field load";) |
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453 } else { |
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454 NOT_PRODUCT(fail_eliminate = "Not store field referrence";) |
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455 } |
a8880a78d355
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456 can_eliminate = false; |
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|
457 } |
a8880a78d355
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|
458 } |
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459 } else if (use->is_SafePoint()) { |
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460 SafePointNode* sfpt = use->as_SafePoint(); |
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461 if (sfpt->has_non_debug_use(res)) { |
a8880a78d355
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462 // Object is passed as argument. |
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463 DEBUG_ONLY(disq_node = use;) |
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464 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";) |
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465 can_eliminate = false; |
a8880a78d355
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|
466 } |
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467 Node* sfptMem = sfpt->memory(); |
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468 if (sfptMem == NULL || sfptMem->is_top()) { |
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469 DEBUG_ONLY(disq_node = use;) |
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470 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";) |
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471 can_eliminate = false; |
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|
472 } else { |
a8880a78d355
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473 safepoints.append_if_missing(sfpt); |
a8880a78d355
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|
474 } |
a8880a78d355
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475 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark |
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476 if (use->is_Phi()) { |
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477 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) { |
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478 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
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|
479 } else { |
a8880a78d355
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480 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";) |
a8880a78d355
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|
481 } |
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|
482 DEBUG_ONLY(disq_node = use;) |
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|
483 } else { |
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|
484 if (use->Opcode() == Op_Return) { |
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485 NOT_PRODUCT(fail_eliminate = "Object is return value";) |
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|
486 }else { |
a8880a78d355
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487 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";) |
a8880a78d355
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|
488 } |
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|
489 DEBUG_ONLY(disq_node = use;) |
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|
490 } |
a8880a78d355
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|
491 can_eliminate = false; |
a8880a78d355
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|
492 } |
a8880a78d355
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|
493 } |
a8880a78d355
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|
494 } |
a8880a78d355
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|
495 |
a8880a78d355
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|
496 #ifndef PRODUCT |
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497 if (PrintEliminateAllocations) { |
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|
498 if (can_eliminate) { |
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|
499 tty->print("Scalar "); |
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|
500 if (res == NULL) |
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|
501 alloc->dump(); |
a8880a78d355
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|
502 else |
a8880a78d355
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|
503 res->dump(); |
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|
504 } else { |
a8880a78d355
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|
505 tty->print("NotScalar (%s)", fail_eliminate); |
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|
506 if (res == NULL) |
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|
507 alloc->dump(); |
a8880a78d355
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|
508 else |
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|
509 res->dump(); |
a8880a78d355
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|
510 #ifdef ASSERT |
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|
511 if (disq_node != NULL) { |
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|
512 tty->print(" >>>> "); |
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|
513 disq_node->dump(); |
a8880a78d355
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|
514 } |
a8880a78d355
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|
515 #endif /*ASSERT*/ |
a8880a78d355
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|
516 } |
a8880a78d355
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|
517 } |
a8880a78d355
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518 #endif |
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519 return can_eliminate; |
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520 } |
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521 |
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522 // Do scalar replacement. |
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523 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) { |
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524 GrowableArray <SafePointNode *> safepoints_done; |
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525 |
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526 ciKlass* klass = NULL; |
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527 ciInstanceKlass* iklass = NULL; |
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528 int nfields = 0; |
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529 int array_base; |
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530 int element_size; |
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531 BasicType basic_elem_type; |
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532 ciType* elem_type; |
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533 |
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534 Node* res = alloc->result_cast(); |
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535 const TypeOopPtr* res_type = NULL; |
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536 if (res != NULL) { // Could be NULL when there are no users |
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537 res_type = _igvn.type(res)->isa_oopptr(); |
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538 } |
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539 |
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540 if (res != NULL) { |
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541 klass = res_type->klass(); |
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542 if (res_type->isa_instptr()) { |
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543 // find the fields of the class which will be needed for safepoint debug information |
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544 assert(klass->is_instance_klass(), "must be an instance klass."); |
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545 iklass = klass->as_instance_klass(); |
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546 nfields = iklass->nof_nonstatic_fields(); |
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547 } else { |
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548 // find the array's elements which will be needed for safepoint debug information |
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549 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1); |
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550 assert(klass->is_array_klass() && nfields >= 0, "must be an array klass."); |
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551 elem_type = klass->as_array_klass()->element_type(); |
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552 basic_elem_type = elem_type->basic_type(); |
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553 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type); |
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554 element_size = type2aelembytes(basic_elem_type); |
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555 } |
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556 } |
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557 // |
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558 // Process the safepoint uses |
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559 // |
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560 while (safepoints.length() > 0) { |
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561 SafePointNode* sfpt = safepoints.pop(); |
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562 Node* mem = sfpt->memory(); |
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563 uint first_ind = sfpt->req(); |
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564 SafePointScalarObjectNode* sobj = new (C, 1) SafePointScalarObjectNode(res_type, |
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565 #ifdef ASSERT |
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566 alloc, |
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567 #endif |
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568 first_ind, nfields); |
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569 sobj->init_req(0, sfpt->in(TypeFunc::Control)); |
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570 transform_later(sobj); |
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571 |
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572 // Scan object's fields adding an input to the safepoint for each field. |
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573 for (int j = 0; j < nfields; j++) { |
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574 int offset; |
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575 ciField* field = NULL; |
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576 if (iklass != NULL) { |
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577 field = iklass->nonstatic_field_at(j); |
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578 offset = field->offset(); |
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579 elem_type = field->type(); |
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580 basic_elem_type = field->layout_type(); |
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581 } else { |
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582 offset = array_base + j * element_size; |
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583 } |
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584 |
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585 const Type *field_type; |
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586 // The next code is taken from Parse::do_get_xxx(). |
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587 if (basic_elem_type == T_OBJECT) { |
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588 if (!elem_type->is_loaded()) { |
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589 field_type = TypeInstPtr::BOTTOM; |
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590 } else if (field != NULL && field->is_constant()) { |
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591 // This can happen if the constant oop is non-perm. |
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592 ciObject* con = field->constant_value().as_object(); |
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593 // Do not "join" in the previous type; it doesn't add value, |
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594 // and may yield a vacuous result if the field is of interface type. |
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595 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); |
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596 assert(field_type != NULL, "field singleton type must be consistent"); |
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597 } else { |
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598 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass()); |
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599 } |
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600 } else { |
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601 field_type = Type::get_const_basic_type(basic_elem_type); |
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602 } |
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603 |
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604 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr(); |
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605 |
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606 Node *field_val = value_from_mem(mem, basic_elem_type, field_type, field_addr_type, alloc); |
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607 if (field_val == NULL) { |
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608 // we weren't able to find a value for this field, |
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609 // give up on eliminating this allocation |
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610 alloc->_is_scalar_replaceable = false; // don't try again |
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611 // remove any extra entries we added to the safepoint |
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612 uint last = sfpt->req() - 1; |
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613 for (int k = 0; k < j; k++) { |
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614 sfpt->del_req(last--); |
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615 } |
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616 // rollback processed safepoints |
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617 while (safepoints_done.length() > 0) { |
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618 SafePointNode* sfpt_done = safepoints_done.pop(); |
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619 // remove any extra entries we added to the safepoint |
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620 last = sfpt_done->req() - 1; |
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621 for (int k = 0; k < nfields; k++) { |
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622 sfpt_done->del_req(last--); |
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623 } |
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624 JVMState *jvms = sfpt_done->jvms(); |
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625 jvms->set_endoff(sfpt_done->req()); |
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626 // Now make a pass over the debug information replacing any references |
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627 // to SafePointScalarObjectNode with the allocated object. |
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628 int start = jvms->debug_start(); |
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629 int end = jvms->debug_end(); |
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630 for (int i = start; i < end; i++) { |
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631 if (sfpt_done->in(i)->is_SafePointScalarObject()) { |
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632 SafePointScalarObjectNode* scobj = sfpt_done->in(i)->as_SafePointScalarObject(); |
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633 if (scobj->first_index() == sfpt_done->req() && |
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634 scobj->n_fields() == (uint)nfields) { |
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635 assert(scobj->alloc() == alloc, "sanity"); |
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636 sfpt_done->set_req(i, res); |
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|
637 } |
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638 } |
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639 } |
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640 } |
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641 #ifndef PRODUCT |
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642 if (PrintEliminateAllocations) { |
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643 if (field != NULL) { |
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644 tty->print("=== At SafePoint node %d can't find value of Field: ", |
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645 sfpt->_idx); |
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646 field->print(); |
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647 int field_idx = C->get_alias_index(field_addr_type); |
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648 tty->print(" (alias_idx=%d)", field_idx); |
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649 } else { // Array's element |
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650 tty->print("=== At SafePoint node %d can't find value of array element [%d]", |
a8880a78d355
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parents:
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diff
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|
651 sfpt->_idx, j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
652 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
653 tty->print(", which prevents elimination of: "); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
654 if (res == NULL) |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
655 alloc->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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|
656 else |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
changeset
|
657 res->dump(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
658 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
659 #endif |
a8880a78d355
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kvn
parents:
66
diff
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|
660 return false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
661 } |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
662 sfpt->add_req(field_val); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
663 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
664 JVMState *jvms = sfpt->jvms(); |
a8880a78d355
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diff
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|
665 jvms->set_endoff(sfpt->req()); |
a8880a78d355
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kvn
parents:
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diff
changeset
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666 // Now make a pass over the debug information replacing any references |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
667 // to the allocated object with "sobj" |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
668 int start = jvms->debug_start(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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|
669 int end = jvms->debug_end(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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|
670 for (int i = start; i < end; i++) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
671 if (sfpt->in(i) == res) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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|
672 sfpt->set_req(i, sobj); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
changeset
|
673 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
changeset
|
674 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
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675 safepoints_done.append_if_missing(sfpt); // keep it for rollback |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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|
676 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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diff
changeset
|
677 return true; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
678 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
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|
679 |
a8880a78d355
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kvn
parents:
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diff
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|
680 // Process users of eliminated allocation. |
a8880a78d355
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diff
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|
681 void PhaseMacroExpand::process_users_of_allocation(AllocateNode *alloc) { |
a8880a78d355
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682 Node* res = alloc->result_cast(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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683 if (res != NULL) { |
a8880a78d355
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parents:
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diff
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684 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) { |
a8880a78d355
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parents:
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diff
changeset
|
685 Node *use = res->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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parents:
66
diff
changeset
|
686 uint oc1 = res->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
687 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
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parents:
66
diff
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|
688 if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
689 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) { |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
690 Node *n = use->last_out(k); |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
691 uint oc2 = use->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
692 if (n->is_Store()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
693 _igvn.replace_node(n, n->in(MemNode::Memory)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
694 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
695 assert( n->Opcode() == Op_CastP2X, "CastP2X required"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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66
diff
changeset
|
696 eliminate_card_mark(n); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
697 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
698 k -= (oc2 - use->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
699 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
700 } else { |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
701 assert( !use->is_SafePoint(), "safepoint uses must have been already elimiated"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
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|
702 assert( use->Opcode() == Op_CastP2X, "CastP2X required"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
703 eliminate_card_mark(use); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
704 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
705 j -= (oc1 - res->outcnt()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
706 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
707 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
|
708 _igvn.remove_dead_node(res); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
709 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
710 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
711 // |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
712 // Process other users of allocation's projections |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
713 // |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
714 if (_resproj != NULL && _resproj->outcnt() != 0) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
715 for (DUIterator_Last jmin, j = _resproj->last_outs(jmin); j >= jmin; ) { |
a8880a78d355
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kvn
parents:
66
diff
changeset
|
716 Node *use = _resproj->last_out(j); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
717 uint oc1 = _resproj->outcnt(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
718 if (use->is_Initialize()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
719 // Eliminate Initialize node. |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
720 InitializeNode *init = use->as_Initialize(); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
721 assert(init->outcnt() <= 2, "only a control and memory projection expected"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
722 Node *ctrl_proj = init->proj_out(TypeFunc::Control); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
723 if (ctrl_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
724 assert(init->in(TypeFunc::Control) == _fallthroughcatchproj, "allocation control projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
725 _igvn.replace_node(ctrl_proj, _fallthroughcatchproj); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
726 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
727 Node *mem_proj = init->proj_out(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
728 if (mem_proj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
729 Node *mem = init->in(TypeFunc::Memory); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
730 #ifdef ASSERT |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
731 if (mem->is_MergeMem()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
732 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
|
733 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
734 assert(mem == _memproj_fallthrough, "allocation memory projection"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
735 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
736 #endif |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
737 _igvn.replace_node(mem_proj, mem); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
738 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
739 } else if (use->is_AddP()) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
740 // raw memory addresses used only by the initialization |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
741 _igvn.hash_delete(use); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
742 _igvn.subsume_node(use, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
743 } else { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
744 assert(false, "only Initialize or AddP expected"); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
745 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
746 j -= (oc1 - _resproj->outcnt()); |
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
parents:
66
diff
changeset
|
748 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
749 if (_fallthroughcatchproj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
750 _igvn.replace_node(_fallthroughcatchproj, alloc->in(TypeFunc::Control)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
751 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
752 if (_memproj_fallthrough != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
753 _igvn.replace_node(_memproj_fallthrough, alloc->in(TypeFunc::Memory)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
754 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
755 if (_memproj_catchall != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
756 _igvn.replace_node(_memproj_catchall, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
757 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
758 if (_ioproj_fallthrough != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
759 _igvn.replace_node(_ioproj_fallthrough, alloc->in(TypeFunc::I_O)); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
760 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
761 if (_ioproj_catchall != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
762 _igvn.replace_node(_ioproj_catchall, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
763 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
764 if (_catchallcatchproj != NULL) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
765 _igvn.replace_node(_catchallcatchproj, C->top()); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
766 } |
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 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
769 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
770 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
771 if (!EliminateAllocations || !alloc->_is_scalar_replaceable) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
772 return false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
773 } |
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 extract_call_projections(alloc); |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
776 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
777 GrowableArray <SafePointNode *> safepoints; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
778 if (!can_eliminate_allocation(alloc, safepoints)) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
779 return false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
780 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
781 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
782 if (!scalar_replacement(alloc, safepoints)) { |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
783 return false; |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
784 } |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
parents:
66
diff
changeset
|
785 |
a8880a78d355
6259129: (Escape Analysis) scalar replacement for not escaping objects
kvn
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786 process_users_of_allocation(alloc); |
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787 |
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788 #ifndef PRODUCT |
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789 if (PrintEliminateAllocations) { |
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790 if (alloc->is_AllocateArray()) |
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791 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx); |
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792 else |
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793 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx); |
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794 } |
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795 #endif |
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796 |
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797 return true; |
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798 } |
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799 |
0 | 800 |
801 //---------------------------set_eden_pointers------------------------- | |
802 void PhaseMacroExpand::set_eden_pointers(Node* &eden_top_adr, Node* &eden_end_adr) { | |
803 if (UseTLAB) { // Private allocation: load from TLS | |
804 Node* thread = transform_later(new (C, 1) ThreadLocalNode()); | |
805 int tlab_top_offset = in_bytes(JavaThread::tlab_top_offset()); | |
806 int tlab_end_offset = in_bytes(JavaThread::tlab_end_offset()); | |
807 eden_top_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_top_offset); | |
808 eden_end_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_end_offset); | |
809 } else { // Shared allocation: load from globals | |
810 CollectedHeap* ch = Universe::heap(); | |
811 address top_adr = (address)ch->top_addr(); | |
812 address end_adr = (address)ch->end_addr(); | |
813 eden_top_adr = makecon(TypeRawPtr::make(top_adr)); | |
814 eden_end_adr = basic_plus_adr(eden_top_adr, end_adr - top_adr); | |
815 } | |
816 } | |
817 | |
818 | |
819 Node* PhaseMacroExpand::make_load(Node* ctl, Node* mem, Node* base, int offset, const Type* value_type, BasicType bt) { | |
820 Node* adr = basic_plus_adr(base, offset); | |
821 const TypePtr* adr_type = TypeRawPtr::BOTTOM; | |
822 Node* value = LoadNode::make(C, ctl, mem, adr, adr_type, value_type, bt); | |
823 transform_later(value); | |
824 return value; | |
825 } | |
826 | |
827 | |
828 Node* PhaseMacroExpand::make_store(Node* ctl, Node* mem, Node* base, int offset, Node* value, BasicType bt) { | |
829 Node* adr = basic_plus_adr(base, offset); | |
830 mem = StoreNode::make(C, ctl, mem, adr, NULL, value, bt); | |
831 transform_later(mem); | |
832 return mem; | |
833 } | |
834 | |
835 //============================================================================= | |
836 // | |
837 // A L L O C A T I O N | |
838 // | |
839 // Allocation attempts to be fast in the case of frequent small objects. | |
840 // It breaks down like this: | |
841 // | |
842 // 1) Size in doublewords is computed. This is a constant for objects and | |
843 // variable for most arrays. Doubleword units are used to avoid size | |
844 // overflow of huge doubleword arrays. We need doublewords in the end for | |
845 // rounding. | |
846 // | |
847 // 2) Size is checked for being 'too large'. Too-large allocations will go | |
848 // the slow path into the VM. The slow path can throw any required | |
849 // exceptions, and does all the special checks for very large arrays. The | |
850 // size test can constant-fold away for objects. For objects with | |
851 // finalizers it constant-folds the otherway: you always go slow with | |
852 // finalizers. | |
853 // | |
854 // 3) If NOT using TLABs, this is the contended loop-back point. | |
855 // Load-Locked the heap top. If using TLABs normal-load the heap top. | |
856 // | |
857 // 4) Check that heap top + size*8 < max. If we fail go the slow ` route. | |
858 // NOTE: "top+size*8" cannot wrap the 4Gig line! Here's why: for largish | |
859 // "size*8" we always enter the VM, where "largish" is a constant picked small | |
860 // enough that there's always space between the eden max and 4Gig (old space is | |
861 // there so it's quite large) and large enough that the cost of entering the VM | |
862 // is dwarfed by the cost to initialize the space. | |
863 // | |
864 // 5) If NOT using TLABs, Store-Conditional the adjusted heap top back | |
865 // down. If contended, repeat at step 3. If using TLABs normal-store | |
866 // adjusted heap top back down; there is no contention. | |
867 // | |
868 // 6) If !ZeroTLAB then Bulk-clear the object/array. Fill in klass & mark | |
869 // fields. | |
870 // | |
871 // 7) Merge with the slow-path; cast the raw memory pointer to the correct | |
872 // oop flavor. | |
873 // | |
874 //============================================================================= | |
875 // FastAllocateSizeLimit value is in DOUBLEWORDS. | |
876 // Allocations bigger than this always go the slow route. | |
877 // This value must be small enough that allocation attempts that need to | |
878 // trigger exceptions go the slow route. Also, it must be small enough so | |
879 // that heap_top + size_in_bytes does not wrap around the 4Gig limit. | |
880 //=============================================================================j// | |
881 // %%% Here is an old comment from parseHelper.cpp; is it outdated? | |
882 // The allocator will coalesce int->oop copies away. See comment in | |
883 // coalesce.cpp about how this works. It depends critically on the exact | |
884 // code shape produced here, so if you are changing this code shape | |
885 // make sure the GC info for the heap-top is correct in and around the | |
886 // slow-path call. | |
887 // | |
888 | |
889 void PhaseMacroExpand::expand_allocate_common( | |
890 AllocateNode* alloc, // allocation node to be expanded | |
891 Node* length, // array length for an array allocation | |
892 const TypeFunc* slow_call_type, // Type of slow call | |
893 address slow_call_address // Address of slow call | |
894 ) | |
895 { | |
896 | |
897 Node* ctrl = alloc->in(TypeFunc::Control); | |
898 Node* mem = alloc->in(TypeFunc::Memory); | |
899 Node* i_o = alloc->in(TypeFunc::I_O); | |
900 Node* size_in_bytes = alloc->in(AllocateNode::AllocSize); | |
901 Node* klass_node = alloc->in(AllocateNode::KlassNode); | |
902 Node* initial_slow_test = alloc->in(AllocateNode::InitialTest); | |
903 | |
73
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904 // With escape analysis, the entire memory state was needed to be able to |
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905 // eliminate the allocation. Since the allocations cannot be eliminated, |
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906 // optimize it to the raw slice. |
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907 if (mem->is_MergeMem()) { |
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908 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw); |
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909 } |
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910 |
0 | 911 Node* eden_top_adr; |
912 Node* eden_end_adr; | |
913 set_eden_pointers(eden_top_adr, eden_end_adr); | |
914 | |
915 uint raw_idx = C->get_alias_index(TypeRawPtr::BOTTOM); | |
916 assert(ctrl != NULL, "must have control"); | |
917 | |
918 // Load Eden::end. Loop invariant and hoisted. | |
919 // | |
920 // Note: We set the control input on "eden_end" and "old_eden_top" when using | |
921 // a TLAB to work around a bug where these values were being moved across | |
922 // a safepoint. These are not oops, so they cannot be include in the oop | |
923 // map, but the can be changed by a GC. The proper way to fix this would | |
924 // be to set the raw memory state when generating a SafepointNode. However | |
925 // this will require extensive changes to the loop optimization in order to | |
926 // prevent a degradation of the optimization. | |
927 // See comment in memnode.hpp, around line 227 in class LoadPNode. | |
928 Node* eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS); | |
929 | |
930 // We need a Region and corresponding Phi's to merge the slow-path and fast-path results. | |
931 // they will not be used if "always_slow" is set | |
932 enum { slow_result_path = 1, fast_result_path = 2 }; | |
933 Node *result_region; | |
934 Node *result_phi_rawmem; | |
935 Node *result_phi_rawoop; | |
936 Node *result_phi_i_o; | |
937 | |
938 // The initial slow comparison is a size check, the comparison | |
939 // we want to do is a BoolTest::gt | |
940 bool always_slow = false; | |
941 int tv = _igvn.find_int_con(initial_slow_test, -1); | |
942 if (tv >= 0) { | |
943 always_slow = (tv == 1); | |
944 initial_slow_test = NULL; | |
945 } else { | |
946 initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn); | |
947 } | |
948 | |
949 if (DTraceAllocProbes) { | |
950 // Force slow-path allocation | |
951 always_slow = true; | |
952 initial_slow_test = NULL; | |
953 } | |
954 | |
955 enum { too_big_or_final_path = 1, need_gc_path = 2 }; | |
956 Node *slow_region = NULL; | |
957 Node *toobig_false = ctrl; | |
958 | |
959 assert (initial_slow_test == NULL || !always_slow, "arguments must be consistent"); | |
960 // generate the initial test if necessary | |
961 if (initial_slow_test != NULL ) { | |
962 slow_region = new (C, 3) RegionNode(3); | |
963 | |
964 // Now make the initial failure test. Usually a too-big test but | |
965 // might be a TRUE for finalizers or a fancy class check for | |
966 // newInstance0. | |
967 IfNode *toobig_iff = new (C, 2) IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN); | |
968 transform_later(toobig_iff); | |
969 // Plug the failing-too-big test into the slow-path region | |
970 Node *toobig_true = new (C, 1) IfTrueNode( toobig_iff ); | |
971 transform_later(toobig_true); | |
972 slow_region ->init_req( too_big_or_final_path, toobig_true ); | |
973 toobig_false = new (C, 1) IfFalseNode( toobig_iff ); | |
974 transform_later(toobig_false); | |
975 } else { // No initial test, just fall into next case | |
976 toobig_false = ctrl; | |
977 debug_only(slow_region = NodeSentinel); | |
978 } | |
979 | |
980 Node *slow_mem = mem; // save the current memory state for slow path | |
981 // generate the fast allocation code unless we know that the initial test will always go slow | |
982 if (!always_slow) { | |
983 // allocate the Region and Phi nodes for the result | |
984 result_region = new (C, 3) RegionNode(3); | |
985 result_phi_rawmem = new (C, 3) PhiNode( result_region, Type::MEMORY, TypeRawPtr::BOTTOM ); | |
986 result_phi_rawoop = new (C, 3) PhiNode( result_region, TypeRawPtr::BOTTOM ); | |
987 result_phi_i_o = new (C, 3) PhiNode( result_region, Type::ABIO ); // I/O is used for Prefetch | |
988 | |
989 // We need a Region for the loop-back contended case. | |
990 enum { fall_in_path = 1, contended_loopback_path = 2 }; | |
991 Node *contended_region; | |
992 Node *contended_phi_rawmem; | |
993 if( UseTLAB ) { | |
994 contended_region = toobig_false; | |
995 contended_phi_rawmem = mem; | |
996 } else { | |
997 contended_region = new (C, 3) RegionNode(3); | |
998 contended_phi_rawmem = new (C, 3) PhiNode( contended_region, Type::MEMORY, TypeRawPtr::BOTTOM); | |
999 // Now handle the passing-too-big test. We fall into the contended | |
1000 // loop-back merge point. | |
1001 contended_region ->init_req( fall_in_path, toobig_false ); | |
1002 contended_phi_rawmem->init_req( fall_in_path, mem ); | |
1003 transform_later(contended_region); | |
1004 transform_later(contended_phi_rawmem); | |
1005 } | |
1006 | |
1007 // Load(-locked) the heap top. | |
1008 // See note above concerning the control input when using a TLAB | |
1009 Node *old_eden_top = UseTLAB | |
1010 ? new (C, 3) LoadPNode ( ctrl, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ) | |
1011 : new (C, 3) LoadPLockedNode( contended_region, contended_phi_rawmem, eden_top_adr ); | |
1012 | |
1013 transform_later(old_eden_top); | |
1014 // Add to heap top to get a new heap top | |
1015 Node *new_eden_top = new (C, 4) AddPNode( top(), old_eden_top, size_in_bytes ); | |
1016 transform_later(new_eden_top); | |
1017 // Check for needing a GC; compare against heap end | |
1018 Node *needgc_cmp = new (C, 3) CmpPNode( new_eden_top, eden_end ); | |
1019 transform_later(needgc_cmp); | |
1020 Node *needgc_bol = new (C, 2) BoolNode( needgc_cmp, BoolTest::ge ); | |
1021 transform_later(needgc_bol); | |
1022 IfNode *needgc_iff = new (C, 2) IfNode(contended_region, needgc_bol, PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); | |
1023 transform_later(needgc_iff); | |
1024 | |
1025 // Plug the failing-heap-space-need-gc test into the slow-path region | |
1026 Node *needgc_true = new (C, 1) IfTrueNode( needgc_iff ); | |
1027 transform_later(needgc_true); | |
1028 if( initial_slow_test ) { | |
1029 slow_region ->init_req( need_gc_path, needgc_true ); | |
1030 // This completes all paths into the slow merge point | |
1031 transform_later(slow_region); | |
1032 } else { // No initial slow path needed! | |
1033 // Just fall from the need-GC path straight into the VM call. | |
1034 slow_region = needgc_true; | |
1035 } | |
1036 // No need for a GC. Setup for the Store-Conditional | |
1037 Node *needgc_false = new (C, 1) IfFalseNode( needgc_iff ); | |
1038 transform_later(needgc_false); | |
1039 | |
1040 // Grab regular I/O before optional prefetch may change it. | |
1041 // Slow-path does no I/O so just set it to the original I/O. | |
1042 result_phi_i_o->init_req( slow_result_path, i_o ); | |
1043 | |
1044 i_o = prefetch_allocation(i_o, needgc_false, contended_phi_rawmem, | |
1045 old_eden_top, new_eden_top, length); | |
1046 | |
1047 // Store (-conditional) the modified eden top back down. | |
1048 // StorePConditional produces flags for a test PLUS a modified raw | |
1049 // memory state. | |
1050 Node *store_eden_top; | |
1051 Node *fast_oop_ctrl; | |
1052 if( UseTLAB ) { | |
1053 store_eden_top = new (C, 4) StorePNode( needgc_false, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, new_eden_top ); | |
1054 transform_later(store_eden_top); | |
1055 fast_oop_ctrl = needgc_false; // No contention, so this is the fast path | |
1056 } else { | |
1057 store_eden_top = new (C, 5) StorePConditionalNode( needgc_false, contended_phi_rawmem, eden_top_adr, new_eden_top, old_eden_top ); | |
1058 transform_later(store_eden_top); | |
1059 Node *contention_check = new (C, 2) BoolNode( store_eden_top, BoolTest::ne ); | |
1060 transform_later(contention_check); | |
1061 store_eden_top = new (C, 1) SCMemProjNode(store_eden_top); | |
1062 transform_later(store_eden_top); | |
1063 | |
1064 // If not using TLABs, check to see if there was contention. | |
1065 IfNode *contention_iff = new (C, 2) IfNode ( needgc_false, contention_check, PROB_MIN, COUNT_UNKNOWN ); | |
1066 transform_later(contention_iff); | |
1067 Node *contention_true = new (C, 1) IfTrueNode( contention_iff ); | |
1068 transform_later(contention_true); | |
1069 // If contention, loopback and try again. | |
1070 contended_region->init_req( contended_loopback_path, contention_true ); | |
1071 contended_phi_rawmem->init_req( contended_loopback_path, store_eden_top ); | |
1072 | |
1073 // Fast-path succeeded with no contention! | |
1074 Node *contention_false = new (C, 1) IfFalseNode( contention_iff ); | |
1075 transform_later(contention_false); | |
1076 fast_oop_ctrl = contention_false; | |
1077 } | |
1078 | |
1079 // Rename successful fast-path variables to make meaning more obvious | |
1080 Node* fast_oop = old_eden_top; | |
1081 Node* fast_oop_rawmem = store_eden_top; | |
1082 fast_oop_rawmem = initialize_object(alloc, | |
1083 fast_oop_ctrl, fast_oop_rawmem, fast_oop, | |
1084 klass_node, length, size_in_bytes); | |
1085 | |
1086 if (ExtendedDTraceProbes) { | |
1087 // Slow-path call | |
1088 int size = TypeFunc::Parms + 2; | |
1089 CallLeafNode *call = new (C, size) CallLeafNode(OptoRuntime::dtrace_object_alloc_Type(), | |
1090 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc_base), | |
1091 "dtrace_object_alloc", | |
1092 TypeRawPtr::BOTTOM); | |
1093 | |
1094 // Get base of thread-local storage area | |
1095 Node* thread = new (C, 1) ThreadLocalNode(); | |
1096 transform_later(thread); | |
1097 | |
1098 call->init_req(TypeFunc::Parms+0, thread); | |
1099 call->init_req(TypeFunc::Parms+1, fast_oop); | |
1100 call->init_req( TypeFunc::Control, fast_oop_ctrl ); | |
1101 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1102 call->init_req( TypeFunc::Memory , fast_oop_rawmem ); | |
1103 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1104 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1105 transform_later(call); | |
1106 fast_oop_ctrl = new (C, 1) ProjNode(call,TypeFunc::Control); | |
1107 transform_later(fast_oop_ctrl); | |
1108 fast_oop_rawmem = new (C, 1) ProjNode(call,TypeFunc::Memory); | |
1109 transform_later(fast_oop_rawmem); | |
1110 } | |
1111 | |
1112 // Plug in the successful fast-path into the result merge point | |
1113 result_region ->init_req( fast_result_path, fast_oop_ctrl ); | |
1114 result_phi_rawoop->init_req( fast_result_path, fast_oop ); | |
1115 result_phi_i_o ->init_req( fast_result_path, i_o ); | |
1116 result_phi_rawmem->init_req( fast_result_path, fast_oop_rawmem ); | |
1117 } else { | |
1118 slow_region = ctrl; | |
1119 } | |
1120 | |
1121 // Generate slow-path call | |
1122 CallNode *call = new (C, slow_call_type->domain()->cnt()) | |
1123 CallStaticJavaNode(slow_call_type, slow_call_address, | |
1124 OptoRuntime::stub_name(slow_call_address), | |
1125 alloc->jvms()->bci(), | |
1126 TypePtr::BOTTOM); | |
1127 call->init_req( TypeFunc::Control, slow_region ); | |
1128 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
1129 call->init_req( TypeFunc::Memory , slow_mem ); // may gc ptrs | |
1130 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) ); | |
1131 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) ); | |
1132 | |
1133 call->init_req(TypeFunc::Parms+0, klass_node); | |
1134 if (length != NULL) { | |
1135 call->init_req(TypeFunc::Parms+1, length); | |
1136 } | |
1137 | |
1138 // Copy debug information and adjust JVMState information, then replace | |
1139 // allocate node with the call | |
1140 copy_call_debug_info((CallNode *) alloc, call); | |
1141 if (!always_slow) { | |
1142 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON. | |
1143 } | |
1144 _igvn.hash_delete(alloc); | |
1145 _igvn.subsume_node(alloc, call); | |
1146 transform_later(call); | |
1147 | |
1148 // Identify the output projections from the allocate node and | |
1149 // adjust any references to them. | |
1150 // The control and io projections look like: | |
1151 // | |
1152 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl) | |
1153 // Allocate Catch | |
1154 // ^---Proj(io) <-------+ ^---CatchProj(io) | |
1155 // | |
1156 // We are interested in the CatchProj nodes. | |
1157 // | |
1158 extract_call_projections(call); | |
1159 | |
1160 // An allocate node has separate memory projections for the uses on the control and i_o paths | |
1161 // Replace uses of the control memory projection with result_phi_rawmem (unless we are only generating a slow call) | |
1162 if (!always_slow && _memproj_fallthrough != NULL) { | |
1163 for (DUIterator_Fast imax, i = _memproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1164 Node *use = _memproj_fallthrough->fast_out(i); | |
1165 _igvn.hash_delete(use); | |
1166 imax -= replace_input(use, _memproj_fallthrough, result_phi_rawmem); | |
1167 _igvn._worklist.push(use); | |
1168 // back up iterator | |
1169 --i; | |
1170 } | |
1171 } | |
1172 // Now change uses of _memproj_catchall to use _memproj_fallthrough and delete _memproj_catchall so | |
1173 // we end up with a call that has only 1 memory projection | |
1174 if (_memproj_catchall != NULL ) { | |
1175 if (_memproj_fallthrough == NULL) { | |
1176 _memproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::Memory); | |
1177 transform_later(_memproj_fallthrough); | |
1178 } | |
1179 for (DUIterator_Fast imax, i = _memproj_catchall->fast_outs(imax); i < imax; i++) { | |
1180 Node *use = _memproj_catchall->fast_out(i); | |
1181 _igvn.hash_delete(use); | |
1182 imax -= replace_input(use, _memproj_catchall, _memproj_fallthrough); | |
1183 _igvn._worklist.push(use); | |
1184 // back up iterator | |
1185 --i; | |
1186 } | |
1187 } | |
1188 | |
1189 mem = result_phi_rawmem; | |
1190 | |
1191 // An allocate node has separate i_o projections for the uses on the control and i_o paths | |
1192 // Replace uses of the control i_o projection with result_phi_i_o (unless we are only generating a slow call) | |
1193 if (_ioproj_fallthrough == NULL) { | |
1194 _ioproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::I_O); | |
1195 transform_later(_ioproj_fallthrough); | |
1196 } else if (!always_slow) { | |
1197 for (DUIterator_Fast imax, i = _ioproj_fallthrough->fast_outs(imax); i < imax; i++) { | |
1198 Node *use = _ioproj_fallthrough->fast_out(i); | |
1199 | |
1200 _igvn.hash_delete(use); | |
1201 imax -= replace_input(use, _ioproj_fallthrough, result_phi_i_o); | |
1202 _igvn._worklist.push(use); | |
1203 // back up iterator | |
1204 --i; | |
1205 } | |
1206 } | |
1207 // Now change uses of _ioproj_catchall to use _ioproj_fallthrough and delete _ioproj_catchall so | |
1208 // we end up with a call that has only 1 control projection | |
1209 if (_ioproj_catchall != NULL ) { | |
1210 for (DUIterator_Fast imax, i = _ioproj_catchall->fast_outs(imax); i < imax; i++) { | |
1211 Node *use = _ioproj_catchall->fast_out(i); | |
1212 _igvn.hash_delete(use); | |
1213 imax -= replace_input(use, _ioproj_catchall, _ioproj_fallthrough); | |
1214 _igvn._worklist.push(use); | |
1215 // back up iterator | |
1216 --i; | |
1217 } | |
1218 } | |
1219 | |
1220 // if we generated only a slow call, we are done | |
1221 if (always_slow) | |
1222 return; | |
1223 | |
1224 | |
1225 if (_fallthroughcatchproj != NULL) { | |
1226 ctrl = _fallthroughcatchproj->clone(); | |
1227 transform_later(ctrl); | |
1228 _igvn.hash_delete(_fallthroughcatchproj); | |
1229 _igvn.subsume_node(_fallthroughcatchproj, result_region); | |
1230 } else { | |
1231 ctrl = top(); | |
1232 } | |
1233 Node *slow_result; | |
1234 if (_resproj == NULL) { | |
1235 // no uses of the allocation result | |
1236 slow_result = top(); | |
1237 } else { | |
1238 slow_result = _resproj->clone(); | |
1239 transform_later(slow_result); | |
1240 _igvn.hash_delete(_resproj); | |
1241 _igvn.subsume_node(_resproj, result_phi_rawoop); | |
1242 } | |
1243 | |
1244 // Plug slow-path into result merge point | |
1245 result_region ->init_req( slow_result_path, ctrl ); | |
1246 result_phi_rawoop->init_req( slow_result_path, slow_result); | |
1247 result_phi_rawmem->init_req( slow_result_path, _memproj_fallthrough ); | |
1248 transform_later(result_region); | |
1249 transform_later(result_phi_rawoop); | |
1250 transform_later(result_phi_rawmem); | |
1251 transform_later(result_phi_i_o); | |
1252 // This completes all paths into the result merge point | |
1253 } | |
1254 | |
1255 | |
1256 // Helper for PhaseMacroExpand::expand_allocate_common. | |
1257 // Initializes the newly-allocated storage. | |
1258 Node* | |
1259 PhaseMacroExpand::initialize_object(AllocateNode* alloc, | |
1260 Node* control, Node* rawmem, Node* object, | |
1261 Node* klass_node, Node* length, | |
1262 Node* size_in_bytes) { | |
1263 InitializeNode* init = alloc->initialization(); | |
1264 // Store the klass & mark bits | |
1265 Node* mark_node = NULL; | |
1266 // For now only enable fast locking for non-array types | |
1267 if (UseBiasedLocking && (length == NULL)) { | |
1268 mark_node = make_load(NULL, rawmem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeRawPtr::BOTTOM, T_ADDRESS); | |
1269 } else { | |
1270 mark_node = makecon(TypeRawPtr::make((address)markOopDesc::prototype())); | |
1271 } | |
1272 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS); | |
1273 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_OBJECT); | |
1274 int header_size = alloc->minimum_header_size(); // conservatively small | |
1275 | |
1276 // Array length | |
1277 if (length != NULL) { // Arrays need length field | |
1278 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT); | |
1279 // conservatively small header size: | |
1280 header_size = sizeof(arrayOopDesc); | |
1281 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass(); | |
1282 if (k->is_array_klass()) // we know the exact header size in most cases: | |
1283 header_size = Klass::layout_helper_header_size(k->layout_helper()); | |
1284 } | |
1285 | |
1286 // Clear the object body, if necessary. | |
1287 if (init == NULL) { | |
1288 // The init has somehow disappeared; be cautious and clear everything. | |
1289 // | |
1290 // This can happen if a node is allocated but an uncommon trap occurs | |
1291 // immediately. In this case, the Initialize gets associated with the | |
1292 // trap, and may be placed in a different (outer) loop, if the Allocate | |
1293 // is in a loop. If (this is rare) the inner loop gets unrolled, then | |
1294 // there can be two Allocates to one Initialize. The answer in all these | |
1295 // edge cases is safety first. It is always safe to clear immediately | |
1296 // within an Allocate, and then (maybe or maybe not) clear some more later. | |
1297 if (!ZeroTLAB) | |
1298 rawmem = ClearArrayNode::clear_memory(control, rawmem, object, | |
1299 header_size, size_in_bytes, | |
1300 &_igvn); | |
1301 } else { | |
1302 if (!init->is_complete()) { | |
1303 // Try to win by zeroing only what the init does not store. | |
1304 // We can also try to do some peephole optimizations, | |
1305 // such as combining some adjacent subword stores. | |
1306 rawmem = init->complete_stores(control, rawmem, object, | |
1307 header_size, size_in_bytes, &_igvn); | |
1308 } | |
1309 | |
1310 // We have no more use for this link, since the AllocateNode goes away: | |
1311 init->set_req(InitializeNode::RawAddress, top()); | |
1312 // (If we keep the link, it just confuses the register allocator, | |
1313 // who thinks he sees a real use of the address by the membar.) | |
1314 } | |
1315 | |
1316 return rawmem; | |
1317 } | |
1318 | |
1319 // Generate prefetch instructions for next allocations. | |
1320 Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false, | |
1321 Node*& contended_phi_rawmem, | |
1322 Node* old_eden_top, Node* new_eden_top, | |
1323 Node* length) { | |
1324 if( UseTLAB && AllocatePrefetchStyle == 2 ) { | |
1325 // Generate prefetch allocation with watermark check. | |
1326 // As an allocation hits the watermark, we will prefetch starting | |
1327 // at a "distance" away from watermark. | |
1328 enum { fall_in_path = 1, pf_path = 2 }; | |
1329 | |
1330 Node *pf_region = new (C, 3) RegionNode(3); | |
1331 Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY, | |
1332 TypeRawPtr::BOTTOM ); | |
1333 // I/O is used for Prefetch | |
1334 Node *pf_phi_abio = new (C, 3) PhiNode( pf_region, Type::ABIO ); | |
1335 | |
1336 Node *thread = new (C, 1) ThreadLocalNode(); | |
1337 transform_later(thread); | |
1338 | |
1339 Node *eden_pf_adr = new (C, 4) AddPNode( top()/*not oop*/, thread, | |
1340 _igvn.MakeConX(in_bytes(JavaThread::tlab_pf_top_offset())) ); | |
1341 transform_later(eden_pf_adr); | |
1342 | |
1343 Node *old_pf_wm = new (C, 3) LoadPNode( needgc_false, | |
1344 contended_phi_rawmem, eden_pf_adr, | |
1345 TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); | |
1346 transform_later(old_pf_wm); | |
1347 | |
1348 // check against new_eden_top | |
1349 Node *need_pf_cmp = new (C, 3) CmpPNode( new_eden_top, old_pf_wm ); | |
1350 transform_later(need_pf_cmp); | |
1351 Node *need_pf_bol = new (C, 2) BoolNode( need_pf_cmp, BoolTest::ge ); | |
1352 transform_later(need_pf_bol); | |
1353 IfNode *need_pf_iff = new (C, 2) IfNode( needgc_false, need_pf_bol, | |
1354 PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN ); | |
1355 transform_later(need_pf_iff); | |
1356 | |
1357 // true node, add prefetchdistance | |
1358 Node *need_pf_true = new (C, 1) IfTrueNode( need_pf_iff ); | |
1359 transform_later(need_pf_true); | |
1360 | |
1361 Node *need_pf_false = new (C, 1) IfFalseNode( need_pf_iff ); | |
1362 transform_later(need_pf_false); | |
1363 | |
1364 Node *new_pf_wmt = new (C, 4) AddPNode( top(), old_pf_wm, | |
1365 _igvn.MakeConX(AllocatePrefetchDistance) ); | |
1366 transform_later(new_pf_wmt ); | |
1367 new_pf_wmt->set_req(0, need_pf_true); | |
1368 | |
1369 Node *store_new_wmt = new (C, 4) StorePNode( need_pf_true, | |
1370 contended_phi_rawmem, eden_pf_adr, | |
1371 TypeRawPtr::BOTTOM, new_pf_wmt ); | |
1372 transform_later(store_new_wmt); | |
1373 | |
1374 // adding prefetches | |
1375 pf_phi_abio->init_req( fall_in_path, i_o ); | |
1376 | |
1377 Node *prefetch_adr; | |
1378 Node *prefetch; | |
1379 uint lines = AllocatePrefetchDistance / AllocatePrefetchStepSize; | |
1380 uint step_size = AllocatePrefetchStepSize; | |
1381 uint distance = 0; | |
1382 | |
1383 for ( uint i = 0; i < lines; i++ ) { | |
1384 prefetch_adr = new (C, 4) AddPNode( old_pf_wm, new_pf_wmt, | |
1385 _igvn.MakeConX(distance) ); | |
1386 transform_later(prefetch_adr); | |
1387 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1388 transform_later(prefetch); | |
1389 distance += step_size; | |
1390 i_o = prefetch; | |
1391 } | |
1392 pf_phi_abio->set_req( pf_path, i_o ); | |
1393 | |
1394 pf_region->init_req( fall_in_path, need_pf_false ); | |
1395 pf_region->init_req( pf_path, need_pf_true ); | |
1396 | |
1397 pf_phi_rawmem->init_req( fall_in_path, contended_phi_rawmem ); | |
1398 pf_phi_rawmem->init_req( pf_path, store_new_wmt ); | |
1399 | |
1400 transform_later(pf_region); | |
1401 transform_later(pf_phi_rawmem); | |
1402 transform_later(pf_phi_abio); | |
1403 | |
1404 needgc_false = pf_region; | |
1405 contended_phi_rawmem = pf_phi_rawmem; | |
1406 i_o = pf_phi_abio; | |
1407 } else if( AllocatePrefetchStyle > 0 ) { | |
1408 // Insert a prefetch for each allocation only on the fast-path | |
1409 Node *prefetch_adr; | |
1410 Node *prefetch; | |
1411 // Generate several prefetch instructions only for arrays. | |
1412 uint lines = (length != NULL) ? AllocatePrefetchLines : 1; | |
1413 uint step_size = AllocatePrefetchStepSize; | |
1414 uint distance = AllocatePrefetchDistance; | |
1415 for ( uint i = 0; i < lines; i++ ) { | |
1416 prefetch_adr = new (C, 4) AddPNode( old_eden_top, new_eden_top, | |
1417 _igvn.MakeConX(distance) ); | |
1418 transform_later(prefetch_adr); | |
1419 prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr ); | |
1420 // Do not let it float too high, since if eden_top == eden_end, | |
1421 // both might be null. | |
1422 if( i == 0 ) { // Set control for first prefetch, next follows it | |
1423 prefetch->init_req(0, needgc_false); | |
1424 } | |
1425 transform_later(prefetch); | |
1426 distance += step_size; | |
1427 i_o = prefetch; | |
1428 } | |
1429 } | |
1430 return i_o; | |
1431 } | |
1432 | |
1433 | |
1434 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) { | |
1435 expand_allocate_common(alloc, NULL, | |
1436 OptoRuntime::new_instance_Type(), | |
1437 OptoRuntime::new_instance_Java()); | |
1438 } | |
1439 | |
1440 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) { | |
1441 Node* length = alloc->in(AllocateNode::ALength); | |
1442 expand_allocate_common(alloc, length, | |
1443 OptoRuntime::new_array_Type(), | |
1444 OptoRuntime::new_array_Java()); | |
1445 } | |
1446 | |
1447 | |
1448 // we have determined that this lock/unlock can be eliminated, we simply | |
1449 // eliminate the node without expanding it. | |
1450 // | |
1451 // Note: The membar's associated with the lock/unlock are currently not | |
1452 // eliminated. This should be investigated as a future enhancement. | |
1453 // | |
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1454 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) { |
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1455 |
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1456 if (!alock->is_eliminated()) { |
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1457 return false; |
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1458 } |
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1459 // Mark the box lock as eliminated if all correspondent locks are eliminated |
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1460 // to construct correct debug info. |
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1461 BoxLockNode* box = alock->box_node()->as_BoxLock(); |
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1462 if (!box->is_eliminated()) { |
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1463 bool eliminate = true; |
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1464 for (DUIterator_Fast imax, i = box->fast_outs(imax); i < imax; i++) { |
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1465 Node *lck = box->fast_out(i); |
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1466 if (lck->is_Lock() && !lck->as_AbstractLock()->is_eliminated()) { |
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1467 eliminate = false; |
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1468 break; |
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1469 } |
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1470 } |
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1471 if (eliminate) |
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1472 box->set_eliminated(); |
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1473 } |
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1474 |
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1475 #ifndef PRODUCT |
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1476 if (PrintEliminateLocks) { |
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1477 if (alock->is_Lock()) { |
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1478 tty->print_cr("++++ Eliminating: %d Lock", alock->_idx); |
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1479 } else { |
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1480 tty->print_cr("++++ Eliminating: %d Unlock", alock->_idx); |
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1481 } |
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1482 } |
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1483 #endif |
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1484 |
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1485 Node* mem = alock->in(TypeFunc::Memory); |
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1486 Node* ctrl = alock->in(TypeFunc::Control); |
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1487 |
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1488 extract_call_projections(alock); |
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1489 // There are 2 projections from the lock. The lock node will |
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1490 // be deleted when its last use is subsumed below. |
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1491 assert(alock->outcnt() == 2 && |
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1492 _fallthroughproj != NULL && |
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1493 _memproj_fallthrough != NULL, |
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1494 "Unexpected projections from Lock/Unlock"); |
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1495 |
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1496 Node* fallthroughproj = _fallthroughproj; |
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1497 Node* memproj_fallthrough = _memproj_fallthrough; |
0 | 1498 |
1499 // The memory projection from a lock/unlock is RawMem | |
1500 // The input to a Lock is merged memory, so extract its RawMem input | |
1501 // (unless the MergeMem has been optimized away.) | |
1502 if (alock->is_Lock()) { | |
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1503 // Seach for MemBarAcquire node and delete it also. |
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1504 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar(); |
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1505 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquire, ""); |
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1506 Node* ctrlproj = membar->proj_out(TypeFunc::Control); |
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1507 Node* memproj = membar->proj_out(TypeFunc::Memory); |
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1508 _igvn.hash_delete(ctrlproj); |
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1509 _igvn.subsume_node(ctrlproj, fallthroughproj); |
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1510 _igvn.hash_delete(memproj); |
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1511 _igvn.subsume_node(memproj, memproj_fallthrough); |
0 | 1512 } |
1513 | |
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1514 // Seach for MemBarRelease node and delete it also. |
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1515 if (alock->is_Unlock() && ctrl != NULL && ctrl->is_Proj() && |
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1516 ctrl->in(0)->is_MemBar()) { |
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1517 MemBarNode* membar = ctrl->in(0)->as_MemBar(); |
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1518 assert(membar->Opcode() == Op_MemBarRelease && |
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1519 mem->is_Proj() && membar == mem->in(0), ""); |
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1520 _igvn.hash_delete(fallthroughproj); |
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1521 _igvn.subsume_node(fallthroughproj, ctrl); |
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1522 _igvn.hash_delete(memproj_fallthrough); |
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1523 _igvn.subsume_node(memproj_fallthrough, mem); |
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1524 fallthroughproj = ctrl; |
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1525 memproj_fallthrough = mem; |
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1526 ctrl = membar->in(TypeFunc::Control); |
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1527 mem = membar->in(TypeFunc::Memory); |
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1528 } |
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1529 |
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1530 _igvn.hash_delete(fallthroughproj); |
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1531 _igvn.subsume_node(fallthroughproj, ctrl); |
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1532 _igvn.hash_delete(memproj_fallthrough); |
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1533 _igvn.subsume_node(memproj_fallthrough, mem); |
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1534 return true; |
0 | 1535 } |
1536 | |
1537 | |
1538 //------------------------------expand_lock_node---------------------- | |
1539 void PhaseMacroExpand::expand_lock_node(LockNode *lock) { | |
1540 | |
1541 Node* ctrl = lock->in(TypeFunc::Control); | |
1542 Node* mem = lock->in(TypeFunc::Memory); | |
1543 Node* obj = lock->obj_node(); | |
1544 Node* box = lock->box_node(); | |
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1545 Node* flock = lock->fastlock_node(); |
0 | 1546 |
1547 // Make the merge point | |
1548 Node *region = new (C, 3) RegionNode(3); | |
1549 | |
1550 Node *bol = transform_later(new (C, 2) BoolNode(flock,BoolTest::ne)); | |
1551 Node *iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN ); | |
1552 // Optimize test; set region slot 2 | |
1553 Node *slow_path = opt_iff(region,iff); | |
1554 | |
1555 // Make slow path call | |
1556 CallNode *call = make_slow_call( (CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(), OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path, obj, box ); | |
1557 | |
1558 extract_call_projections(call); | |
1559 | |
1560 // Slow path can only throw asynchronous exceptions, which are always | |
1561 // de-opted. So the compiler thinks the slow-call can never throw an | |
1562 // exception. If it DOES throw an exception we would need the debug | |
1563 // info removed first (since if it throws there is no monitor). | |
1564 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
1565 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
1566 | |
1567 // Capture slow path | |
1568 // disconnect fall-through projection from call and create a new one | |
1569 // hook up users of fall-through projection to region | |
1570 Node *slow_ctrl = _fallthroughproj->clone(); | |
1571 transform_later(slow_ctrl); | |
1572 _igvn.hash_delete(_fallthroughproj); | |
1573 _fallthroughproj->disconnect_inputs(NULL); | |
1574 region->init_req(1, slow_ctrl); | |
1575 // region inputs are now complete | |
1576 transform_later(region); | |
1577 _igvn.subsume_node(_fallthroughproj, region); | |
1578 | |
1579 // create a Phi for the memory state | |
1580 Node *mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); | |
1581 Node *memproj = transform_later( new (C, 1) ProjNode(call, TypeFunc::Memory) ); | |
1582 mem_phi->init_req(1, memproj ); | |
1583 mem_phi->init_req(2, mem); | |
1584 transform_later(mem_phi); | |
1585 _igvn.hash_delete(_memproj_fallthrough); | |
1586 _igvn.subsume_node(_memproj_fallthrough, mem_phi); | |
1587 | |
1588 | |
1589 } | |
1590 | |
1591 //------------------------------expand_unlock_node---------------------- | |
1592 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) { | |
1593 | |
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1594 Node* ctrl = unlock->in(TypeFunc::Control); |
0 | 1595 Node* mem = unlock->in(TypeFunc::Memory); |
1596 Node* obj = unlock->obj_node(); | |
1597 Node* box = unlock->box_node(); | |
1598 | |
1599 // No need for a null check on unlock | |
1600 | |
1601 // Make the merge point | |
1602 RegionNode *region = new (C, 3) RegionNode(3); | |
1603 | |
1604 FastUnlockNode *funlock = new (C, 3) FastUnlockNode( ctrl, obj, box ); | |
1605 funlock = transform_later( funlock )->as_FastUnlock(); | |
1606 Node *bol = transform_later(new (C, 2) BoolNode(funlock,BoolTest::ne)); | |
1607 Node *iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN ); | |
1608 // Optimize test; set region slot 2 | |
1609 Node *slow_path = opt_iff(region,iff); | |
1610 | |
1611 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 ); | |
1612 | |
1613 extract_call_projections(call); | |
1614 | |
1615 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL && | |
1616 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock"); | |
1617 | |
1618 // No exceptions for unlocking | |
1619 // Capture slow path | |
1620 // disconnect fall-through projection from call and create a new one | |
1621 // hook up users of fall-through projection to region | |
1622 Node *slow_ctrl = _fallthroughproj->clone(); | |
1623 transform_later(slow_ctrl); | |
1624 _igvn.hash_delete(_fallthroughproj); | |
1625 _fallthroughproj->disconnect_inputs(NULL); | |
1626 region->init_req(1, slow_ctrl); | |
1627 // region inputs are now complete | |
1628 transform_later(region); | |
1629 _igvn.subsume_node(_fallthroughproj, region); | |
1630 | |
1631 // create a Phi for the memory state | |
1632 Node *mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM); | |
1633 Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) ); | |
1634 mem_phi->init_req(1, memproj ); | |
1635 mem_phi->init_req(2, mem); | |
1636 transform_later(mem_phi); | |
1637 _igvn.hash_delete(_memproj_fallthrough); | |
1638 _igvn.subsume_node(_memproj_fallthrough, mem_phi); | |
1639 | |
1640 | |
1641 } | |
1642 | |
1643 //------------------------------expand_macro_nodes---------------------- | |
1644 // Returns true if a failure occurred. | |
1645 bool PhaseMacroExpand::expand_macro_nodes() { | |
1646 if (C->macro_count() == 0) | |
1647 return false; | |
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1648 // attempt to eliminate allocations |
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1649 bool progress = true; |
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1650 while (progress) { |
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1651 progress = false; |
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1652 for (int i = C->macro_count(); i > 0; i--) { |
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1653 Node * n = C->macro_node(i-1); |
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1654 bool success = false; |
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1655 debug_only(int old_macro_count = C->macro_count();); |
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1656 switch (n->class_id()) { |
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1657 case Node::Class_Allocate: |
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1658 case Node::Class_AllocateArray: |
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1659 success = eliminate_allocate_node(n->as_Allocate()); |
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1660 break; |
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1661 case Node::Class_Lock: |
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1662 case Node::Class_Unlock: |
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1663 success = eliminate_locking_node(n->as_AbstractLock()); |
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1664 break; |
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1665 default: |
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1666 assert(false, "unknown node type in macro list"); |
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1667 } |
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1668 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count"); |
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1669 progress = progress || success; |
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1670 } |
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1671 } |
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1672 // Make sure expansion will not cause node limit to be exceeded. |
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1673 // Worst case is a macro node gets expanded into about 50 nodes. |
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1674 // Allow 50% more for optimization. |
0 | 1675 if (C->check_node_count(C->macro_count() * 75, "out of nodes before macro expansion" ) ) |
1676 return true; | |
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1677 |
0 | 1678 // expand "macro" nodes |
1679 // nodes are removed from the macro list as they are processed | |
1680 while (C->macro_count() > 0) { | |
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1681 int macro_count = C->macro_count(); |
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1682 Node * n = C->macro_node(macro_count-1); |
0 | 1683 assert(n->is_macro(), "only macro nodes expected here"); |
1684 if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) { | |
1685 // node is unreachable, so don't try to expand it | |
1686 C->remove_macro_node(n); | |
1687 continue; | |
1688 } | |
1689 switch (n->class_id()) { | |
1690 case Node::Class_Allocate: | |
1691 expand_allocate(n->as_Allocate()); | |
1692 break; | |
1693 case Node::Class_AllocateArray: | |
1694 expand_allocate_array(n->as_AllocateArray()); | |
1695 break; | |
1696 case Node::Class_Lock: | |
1697 expand_lock_node(n->as_Lock()); | |
1698 break; | |
1699 case Node::Class_Unlock: | |
1700 expand_unlock_node(n->as_Unlock()); | |
1701 break; | |
1702 default: | |
1703 assert(false, "unknown node type in macro list"); | |
1704 } | |
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1705 assert(C->macro_count() < macro_count, "must have deleted a node from macro list"); |
0 | 1706 if (C->failing()) return true; |
1707 } | |
1708 _igvn.optimize(); | |
1709 return false; | |
1710 } |