Mercurial > hg > truffle
annotate src/share/vm/opto/parse1.cpp @ 1359:23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
Summary: Make sure that two marking cycles do not overlap, i.e., a new one can only start after the concurrent marking thread finishes all its work. In the fix I piggy-back a couple of minor extra fixes: some general code reformatting for consistency (only around the code I modified), the removal of a field (G1CollectorPolicy::_should_initiate_conc_mark) which doesn't seem to be used at all (it's only set but never read), as well as moving the "is GC locker active" test earlier into the G1 pause / Full GC and using a more appropriate method for it.
Reviewed-by: johnc, jmasa, jcoomes, ysr
author | tonyp |
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date | Tue, 06 Apr 2010 10:59:45 -0400 |
parents | 7d236a9688c5 |
children | fdd57634910e |
rev | line source |
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0 | 1 /* |
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2 * Copyright 1997-2010 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_parse1.cpp.incl" | |
27 | |
28 // Static array so we can figure out which bytecodes stop us from compiling | |
29 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp | |
30 // and eventually should be encapsulated in a proper class (gri 8/18/98). | |
31 | |
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32 int nodes_created = 0; |
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33 int methods_parsed = 0; |
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34 int methods_seen = 0; |
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35 int blocks_parsed = 0; |
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36 int blocks_seen = 0; |
0 | 37 |
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38 int explicit_null_checks_inserted = 0; |
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39 int explicit_null_checks_elided = 0; |
0 | 40 int all_null_checks_found = 0, implicit_null_checks = 0; |
41 int implicit_null_throws = 0; | |
42 | |
43 int reclaim_idx = 0; | |
44 int reclaim_in = 0; | |
45 int reclaim_node = 0; | |
46 | |
47 #ifndef PRODUCT | |
48 bool Parse::BytecodeParseHistogram::_initialized = false; | |
49 uint Parse::BytecodeParseHistogram::_bytecodes_parsed [Bytecodes::number_of_codes]; | |
50 uint Parse::BytecodeParseHistogram::_nodes_constructed[Bytecodes::number_of_codes]; | |
51 uint Parse::BytecodeParseHistogram::_nodes_transformed[Bytecodes::number_of_codes]; | |
52 uint Parse::BytecodeParseHistogram::_new_values [Bytecodes::number_of_codes]; | |
53 #endif | |
54 | |
55 //------------------------------print_statistics------------------------------- | |
56 #ifndef PRODUCT | |
57 void Parse::print_statistics() { | |
58 tty->print_cr("--- Compiler Statistics ---"); | |
59 tty->print("Methods seen: %d Methods parsed: %d", methods_seen, methods_parsed); | |
60 tty->print(" Nodes created: %d", nodes_created); | |
61 tty->cr(); | |
62 if (methods_seen != methods_parsed) | |
63 tty->print_cr("Reasons for parse failures (NOT cumulative):"); | |
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64 tty->print_cr("Blocks parsed: %d Blocks seen: %d", blocks_parsed, blocks_seen); |
0 | 65 |
66 if( explicit_null_checks_inserted ) | |
67 tty->print_cr("%d original NULL checks - %d elided (%2d%%); optimizer leaves %d,", explicit_null_checks_inserted, explicit_null_checks_elided, (100*explicit_null_checks_elided)/explicit_null_checks_inserted, all_null_checks_found); | |
68 if( all_null_checks_found ) | |
69 tty->print_cr("%d made implicit (%2d%%)", implicit_null_checks, | |
70 (100*implicit_null_checks)/all_null_checks_found); | |
71 if( implicit_null_throws ) | |
72 tty->print_cr("%d implicit null exceptions at runtime", | |
73 implicit_null_throws); | |
74 | |
75 if( PrintParseStatistics && BytecodeParseHistogram::initialized() ) { | |
76 BytecodeParseHistogram::print(); | |
77 } | |
78 } | |
79 #endif | |
80 | |
81 //------------------------------ON STACK REPLACEMENT--------------------------- | |
82 | |
83 // Construct a node which can be used to get incoming state for | |
84 // on stack replacement. | |
85 Node *Parse::fetch_interpreter_state(int index, | |
86 BasicType bt, | |
87 Node *local_addrs, | |
88 Node *local_addrs_base) { | |
89 Node *mem = memory(Compile::AliasIdxRaw); | |
90 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize ); | |
91 | |
92 // Very similar to LoadNode::make, except we handle un-aligned longs and | |
93 // doubles on Sparc. Intel can handle them just fine directly. | |
94 Node *l; | |
95 switch( bt ) { // Signature is flattened | |
96 case T_INT: l = new (C, 3) LoadINode( 0, mem, adr, TypeRawPtr::BOTTOM ); break; | |
97 case T_FLOAT: l = new (C, 3) LoadFNode( 0, mem, adr, TypeRawPtr::BOTTOM ); break; | |
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98 case T_ADDRESS: l = new (C, 3) LoadPNode( 0, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); break; |
0 | 99 case T_OBJECT: l = new (C, 3) LoadPNode( 0, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM ); break; |
100 case T_LONG: | |
101 case T_DOUBLE: { | |
102 // Since arguments are in reverse order, the argument address 'adr' | |
103 // refers to the back half of the long/double. Recompute adr. | |
104 adr = basic_plus_adr( local_addrs_base, local_addrs, -(index+1)*wordSize ); | |
105 if( Matcher::misaligned_doubles_ok ) { | |
106 l = (bt == T_DOUBLE) | |
107 ? (Node*)new (C, 3) LoadDNode( 0, mem, adr, TypeRawPtr::BOTTOM ) | |
108 : (Node*)new (C, 3) LoadLNode( 0, mem, adr, TypeRawPtr::BOTTOM ); | |
109 } else { | |
110 l = (bt == T_DOUBLE) | |
111 ? (Node*)new (C, 3) LoadD_unalignedNode( 0, mem, adr, TypeRawPtr::BOTTOM ) | |
112 : (Node*)new (C, 3) LoadL_unalignedNode( 0, mem, adr, TypeRawPtr::BOTTOM ); | |
113 } | |
114 break; | |
115 } | |
116 default: ShouldNotReachHere(); | |
117 } | |
118 return _gvn.transform(l); | |
119 } | |
120 | |
121 // Helper routine to prevent the interpreter from handing | |
122 // unexpected typestate to an OSR method. | |
123 // The Node l is a value newly dug out of the interpreter frame. | |
124 // The type is the type predicted by ciTypeFlow. Note that it is | |
125 // not a general type, but can only come from Type::get_typeflow_type. | |
126 // The safepoint is a map which will feed an uncommon trap. | |
127 Node* Parse::check_interpreter_type(Node* l, const Type* type, | |
128 SafePointNode* &bad_type_exit) { | |
129 | |
130 const TypeOopPtr* tp = type->isa_oopptr(); | |
131 | |
132 // TypeFlow may assert null-ness if a type appears unloaded. | |
133 if (type == TypePtr::NULL_PTR || | |
134 (tp != NULL && !tp->klass()->is_loaded())) { | |
135 // Value must be null, not a real oop. | |
136 Node* chk = _gvn.transform( new (C, 3) CmpPNode(l, null()) ); | |
137 Node* tst = _gvn.transform( new (C, 2) BoolNode(chk, BoolTest::eq) ); | |
138 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN); | |
139 set_control(_gvn.transform( new (C, 1) IfTrueNode(iff) )); | |
140 Node* bad_type = _gvn.transform( new (C, 1) IfFalseNode(iff) ); | |
141 bad_type_exit->control()->add_req(bad_type); | |
142 l = null(); | |
143 } | |
144 | |
145 // Typeflow can also cut off paths from the CFG, based on | |
146 // types which appear unloaded, or call sites which appear unlinked. | |
147 // When paths are cut off, values at later merge points can rise | |
148 // toward more specific classes. Make sure these specific classes | |
149 // are still in effect. | |
150 if (tp != NULL && tp->klass() != C->env()->Object_klass()) { | |
151 // TypeFlow asserted a specific object type. Value must have that type. | |
152 Node* bad_type_ctrl = NULL; | |
153 l = gen_checkcast(l, makecon(TypeKlassPtr::make(tp->klass())), &bad_type_ctrl); | |
154 bad_type_exit->control()->add_req(bad_type_ctrl); | |
155 } | |
156 | |
157 BasicType bt_l = _gvn.type(l)->basic_type(); | |
158 BasicType bt_t = type->basic_type(); | |
159 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate"); | |
160 return l; | |
161 } | |
162 | |
163 // Helper routine which sets up elements of the initial parser map when | |
164 // performing a parse for on stack replacement. Add values into map. | |
165 // The only parameter contains the address of a interpreter arguments. | |
166 void Parse::load_interpreter_state(Node* osr_buf) { | |
167 int index; | |
168 int max_locals = jvms()->loc_size(); | |
169 int max_stack = jvms()->stk_size(); | |
170 | |
171 | |
172 // Mismatch between method and jvms can occur since map briefly held | |
173 // an OSR entry state (which takes up one RawPtr word). | |
174 assert(max_locals == method()->max_locals(), "sanity"); | |
175 assert(max_stack >= method()->max_stack(), "sanity"); | |
176 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity"); | |
177 assert((int)jvms()->endoff() == (int)map()->req(), "sanity"); | |
178 | |
179 // Find the start block. | |
180 Block* osr_block = start_block(); | |
181 assert(osr_block->start() == osr_bci(), "sanity"); | |
182 | |
183 // Set initial BCI. | |
184 set_parse_bci(osr_block->start()); | |
185 | |
186 // Set initial stack depth. | |
187 set_sp(osr_block->start_sp()); | |
188 | |
189 // Check bailouts. We currently do not perform on stack replacement | |
190 // of loops in catch blocks or loops which branch with a non-empty stack. | |
191 if (sp() != 0) { | |
192 C->record_method_not_compilable("OSR starts with non-empty stack"); | |
193 return; | |
194 } | |
195 // Do not OSR inside finally clauses: | |
196 if (osr_block->has_trap_at(osr_block->start())) { | |
197 C->record_method_not_compilable("OSR starts with an immediate trap"); | |
198 return; | |
199 } | |
200 | |
201 // Commute monitors from interpreter frame to compiler frame. | |
202 assert(jvms()->monitor_depth() == 0, "should be no active locks at beginning of osr"); | |
203 int mcnt = osr_block->flow()->monitor_count(); | |
204 Node *monitors_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals+mcnt*2-1)*wordSize); | |
205 for (index = 0; index < mcnt; index++) { | |
206 // Make a BoxLockNode for the monitor. | |
207 Node *box = _gvn.transform(new (C, 1) BoxLockNode(next_monitor())); | |
208 | |
209 | |
210 // Displaced headers and locked objects are interleaved in the | |
211 // temp OSR buffer. We only copy the locked objects out here. | |
212 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node. | |
213 Node *lock_object = fetch_interpreter_state(index*2, T_OBJECT, monitors_addr, osr_buf); | |
214 // Try and copy the displaced header to the BoxNode | |
215 Node *displaced_hdr = fetch_interpreter_state((index*2) + 1, T_ADDRESS, monitors_addr, osr_buf); | |
216 | |
217 | |
218 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, Compile::AliasIdxRaw); | |
219 | |
220 // Build a bogus FastLockNode (no code will be generated) and push the | |
221 // monitor into our debug info. | |
222 const FastLockNode *flock = _gvn.transform(new (C, 3) FastLockNode( 0, lock_object, box ))->as_FastLock(); | |
223 map()->push_monitor(flock); | |
224 | |
225 // If the lock is our method synchronization lock, tuck it away in | |
226 // _sync_lock for return and rethrow exit paths. | |
227 if (index == 0 && method()->is_synchronized()) { | |
228 _synch_lock = flock; | |
229 } | |
230 } | |
231 | |
991 | 232 // Use the raw liveness computation to make sure that unexpected |
233 // values don't propagate into the OSR frame. | |
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234 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci()); |
0 | 235 if (!live_locals.is_valid()) { |
236 // Degenerate or breakpointed method. | |
237 C->record_method_not_compilable("OSR in empty or breakpointed method"); | |
238 return; | |
239 } | |
240 | |
241 // Extract the needed locals from the interpreter frame. | |
242 Node *locals_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals-1)*wordSize); | |
243 | |
244 // find all the locals that the interpreter thinks contain live oops | |
245 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci()); | |
246 for (index = 0; index < max_locals; index++) { | |
247 | |
248 if (!live_locals.at(index)) { | |
249 continue; | |
250 } | |
251 | |
252 const Type *type = osr_block->local_type_at(index); | |
253 | |
254 if (type->isa_oopptr() != NULL) { | |
255 | |
256 // 6403625: Verify that the interpreter oopMap thinks that the oop is live | |
257 // else we might load a stale oop if the MethodLiveness disagrees with the | |
258 // result of the interpreter. If the interpreter says it is dead we agree | |
259 // by making the value go to top. | |
260 // | |
261 | |
262 if (!live_oops.at(index)) { | |
263 if (C->log() != NULL) { | |
264 C->log()->elem("OSR_mismatch local_index='%d'",index); | |
265 } | |
266 set_local(index, null()); | |
267 // and ignore it for the loads | |
268 continue; | |
269 } | |
270 } | |
271 | |
272 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.) | |
273 if (type == Type::TOP || type == Type::HALF) { | |
274 continue; | |
275 } | |
276 // If the type falls to bottom, then this must be a local that | |
277 // is mixing ints and oops or some such. Forcing it to top | |
278 // makes it go dead. | |
279 if (type == Type::BOTTOM) { | |
280 continue; | |
281 } | |
282 // Construct code to access the appropriate local. | |
283 Node *value = fetch_interpreter_state(index, type->basic_type(), locals_addr, osr_buf); | |
284 set_local(index, value); | |
285 } | |
286 | |
287 // Extract the needed stack entries from the interpreter frame. | |
288 for (index = 0; index < sp(); index++) { | |
289 const Type *type = osr_block->stack_type_at(index); | |
290 if (type != Type::TOP) { | |
291 // Currently the compiler bails out when attempting to on stack replace | |
292 // at a bci with a non-empty stack. We should not reach here. | |
293 ShouldNotReachHere(); | |
294 } | |
295 } | |
296 | |
297 // End the OSR migration | |
298 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(), | |
299 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end), | |
300 "OSR_migration_end", TypeRawPtr::BOTTOM, | |
301 osr_buf); | |
302 | |
303 // Now that the interpreter state is loaded, make sure it will match | |
304 // at execution time what the compiler is expecting now: | |
305 SafePointNode* bad_type_exit = clone_map(); | |
306 bad_type_exit->set_control(new (C, 1) RegionNode(1)); | |
307 | |
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308 assert(osr_block->flow()->jsrs()->size() == 0, "should be no jsrs live at osr point"); |
0 | 309 for (index = 0; index < max_locals; index++) { |
310 if (stopped()) break; | |
311 Node* l = local(index); | |
312 if (l->is_top()) continue; // nothing here | |
313 const Type *type = osr_block->local_type_at(index); | |
314 if (type->isa_oopptr() != NULL) { | |
315 if (!live_oops.at(index)) { | |
316 // skip type check for dead oops | |
317 continue; | |
318 } | |
319 } | |
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320 if (osr_block->flow()->local_type_at(index)->is_return_address()) { |
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321 // In our current system it's illegal for jsr addresses to be |
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322 // live into an OSR entry point because the compiler performs |
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323 // inlining of jsrs. ciTypeFlow has a bailout that detect this |
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324 // case and aborts the compile if addresses are live into an OSR |
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325 // entry point. Because of that we can assume that any address |
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326 // locals at the OSR entry point are dead. Method liveness |
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327 // isn't precise enought to figure out that they are dead in all |
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328 // cases so simply skip checking address locals all |
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329 // together. Any type check is guaranteed to fail since the |
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330 // interpreter type is the result of a load which might have any |
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331 // value and the expected type is a constant. |
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332 continue; |
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333 } |
0 | 334 set_local(index, check_interpreter_type(l, type, bad_type_exit)); |
335 } | |
336 | |
337 for (index = 0; index < sp(); index++) { | |
338 if (stopped()) break; | |
339 Node* l = stack(index); | |
340 if (l->is_top()) continue; // nothing here | |
341 const Type *type = osr_block->stack_type_at(index); | |
342 set_stack(index, check_interpreter_type(l, type, bad_type_exit)); | |
343 } | |
344 | |
345 if (bad_type_exit->control()->req() > 1) { | |
346 // Build an uncommon trap here, if any inputs can be unexpected. | |
347 bad_type_exit->set_control(_gvn.transform( bad_type_exit->control() )); | |
348 record_for_igvn(bad_type_exit->control()); | |
349 SafePointNode* types_are_good = map(); | |
350 set_map(bad_type_exit); | |
351 // The unexpected type happens because a new edge is active | |
352 // in the CFG, which typeflow had previously ignored. | |
353 // E.g., Object x = coldAtFirst() && notReached()? "str": new Integer(123). | |
354 // This x will be typed as Integer if notReached is not yet linked. | |
355 uncommon_trap(Deoptimization::Reason_unreached, | |
356 Deoptimization::Action_reinterpret); | |
357 set_map(types_are_good); | |
358 } | |
359 } | |
360 | |
361 //------------------------------Parse------------------------------------------ | |
362 // Main parser constructor. | |
363 Parse::Parse(JVMState* caller, ciMethod* parse_method, float expected_uses) | |
364 : _exits(caller) | |
365 { | |
366 // Init some variables | |
367 _caller = caller; | |
368 _method = parse_method; | |
369 _expected_uses = expected_uses; | |
370 _depth = 1 + (caller->has_method() ? caller->depth() : 0); | |
371 _wrote_final = false; | |
372 _entry_bci = InvocationEntryBci; | |
373 _tf = NULL; | |
374 _block = NULL; | |
375 debug_only(_block_count = -1); | |
376 debug_only(_blocks = (Block*)-1); | |
377 #ifndef PRODUCT | |
378 if (PrintCompilation || PrintOpto) { | |
379 // Make sure I have an inline tree, so I can print messages about it. | |
380 JVMState* ilt_caller = is_osr_parse() ? caller->caller() : caller; | |
381 InlineTree::find_subtree_from_root(C->ilt(), ilt_caller, parse_method, true); | |
382 } | |
383 _max_switch_depth = 0; | |
384 _est_switch_depth = 0; | |
385 #endif | |
386 | |
387 _tf = TypeFunc::make(method()); | |
388 _iter.reset_to_method(method()); | |
389 _flow = method()->get_flow_analysis(); | |
390 if (_flow->failing()) { | |
391 C->record_method_not_compilable_all_tiers(_flow->failure_reason()); | |
392 } | |
393 | |
367
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394 #ifndef PRODUCT |
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395 if (_flow->has_irreducible_entry()) { |
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396 C->set_parsed_irreducible_loop(true); |
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397 } |
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398 #endif |
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399 |
0 | 400 if (_expected_uses <= 0) { |
401 _prof_factor = 1; | |
402 } else { | |
403 float prof_total = parse_method->interpreter_invocation_count(); | |
404 if (prof_total <= _expected_uses) { | |
405 _prof_factor = 1; | |
406 } else { | |
407 _prof_factor = _expected_uses / prof_total; | |
408 } | |
409 } | |
410 | |
411 CompileLog* log = C->log(); | |
412 if (log != NULL) { | |
413 log->begin_head("parse method='%d' uses='%g'", | |
414 log->identify(parse_method), expected_uses); | |
415 if (depth() == 1 && C->is_osr_compilation()) { | |
416 log->print(" osr_bci='%d'", C->entry_bci()); | |
417 } | |
418 log->stamp(); | |
419 log->end_head(); | |
420 } | |
421 | |
422 // Accumulate deoptimization counts. | |
423 // (The range_check and store_check counts are checked elsewhere.) | |
424 ciMethodData* md = method()->method_data(); | |
425 for (uint reason = 0; reason < md->trap_reason_limit(); reason++) { | |
426 uint md_count = md->trap_count(reason); | |
427 if (md_count != 0) { | |
428 if (md_count == md->trap_count_limit()) | |
429 md_count += md->overflow_trap_count(); | |
430 uint total_count = C->trap_count(reason); | |
431 uint old_count = total_count; | |
432 total_count += md_count; | |
433 // Saturate the add if it overflows. | |
434 if (total_count < old_count || total_count < md_count) | |
435 total_count = (uint)-1; | |
436 C->set_trap_count(reason, total_count); | |
437 if (log != NULL) | |
438 log->elem("observe trap='%s' count='%d' total='%d'", | |
439 Deoptimization::trap_reason_name(reason), | |
440 md_count, total_count); | |
441 } | |
442 } | |
443 // Accumulate total sum of decompilations, also. | |
444 C->set_decompile_count(C->decompile_count() + md->decompile_count()); | |
445 | |
446 _count_invocations = C->do_count_invocations(); | |
447 _method_data_update = C->do_method_data_update(); | |
448 | |
449 if (log != NULL && method()->has_exception_handlers()) { | |
450 log->elem("observe that='has_exception_handlers'"); | |
451 } | |
452 | |
453 assert(method()->can_be_compiled(), "Can not parse this method, cutout earlier"); | |
454 assert(method()->has_balanced_monitors(), "Can not parse unbalanced monitors, cutout earlier"); | |
455 | |
456 // Always register dependence if JVMTI is enabled, because | |
457 // either breakpoint setting or hotswapping of methods may | |
458 // cause deoptimization. | |
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459 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) { |
0 | 460 C->dependencies()->assert_evol_method(method()); |
461 } | |
462 | |
463 methods_seen++; | |
464 | |
465 // Do some special top-level things. | |
466 if (depth() == 1 && C->is_osr_compilation()) { | |
467 _entry_bci = C->entry_bci(); | |
468 _flow = method()->get_osr_flow_analysis(osr_bci()); | |
469 if (_flow->failing()) { | |
470 C->record_method_not_compilable(_flow->failure_reason()); | |
471 #ifndef PRODUCT | |
472 if (PrintOpto && (Verbose || WizardMode)) { | |
473 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason()); | |
474 if (Verbose) { | |
475 method()->print_oop(); | |
476 method()->print_codes(); | |
477 _flow->print(); | |
478 } | |
479 } | |
480 #endif | |
481 } | |
482 _tf = C->tf(); // the OSR entry type is different | |
483 } | |
484 | |
485 #ifdef ASSERT | |
486 if (depth() == 1) { | |
487 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync"); | |
488 if (C->tf() != tf()) { | |
489 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag); | |
490 assert(C->env()->system_dictionary_modification_counter_changed(), | |
491 "Must invalidate if TypeFuncs differ"); | |
492 } | |
493 } else { | |
494 assert(!this->is_osr_parse(), "no recursive OSR"); | |
495 } | |
496 #endif | |
497 | |
498 methods_parsed++; | |
499 #ifndef PRODUCT | |
500 // add method size here to guarantee that inlined methods are added too | |
501 if (TimeCompiler) | |
502 _total_bytes_compiled += method()->code_size(); | |
503 | |
504 show_parse_info(); | |
505 #endif | |
506 | |
507 if (failing()) { | |
508 if (log) log->done("parse"); | |
509 return; | |
510 } | |
511 | |
512 gvn().set_type(root(), root()->bottom_type()); | |
513 gvn().transform(top()); | |
514 | |
515 // Import the results of the ciTypeFlow. | |
516 init_blocks(); | |
517 | |
518 // Merge point for all normal exits | |
519 build_exits(); | |
520 | |
521 // Setup the initial JVM state map. | |
522 SafePointNode* entry_map = create_entry_map(); | |
523 | |
524 // Check for bailouts during map initialization | |
525 if (failing() || entry_map == NULL) { | |
526 if (log) log->done("parse"); | |
527 return; | |
528 } | |
529 | |
530 Node_Notes* caller_nn = C->default_node_notes(); | |
531 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls. | |
532 if (DebugInlinedCalls || depth() == 1) { | |
533 C->set_default_node_notes(make_node_notes(caller_nn)); | |
534 } | |
535 | |
536 if (is_osr_parse()) { | |
537 Node* osr_buf = entry_map->in(TypeFunc::Parms+0); | |
538 entry_map->set_req(TypeFunc::Parms+0, top()); | |
539 set_map(entry_map); | |
540 load_interpreter_state(osr_buf); | |
541 } else { | |
542 set_map(entry_map); | |
543 do_method_entry(); | |
544 } | |
545 | |
546 // Check for bailouts during method entry. | |
547 if (failing()) { | |
548 if (log) log->done("parse"); | |
549 C->set_default_node_notes(caller_nn); | |
550 return; | |
551 } | |
552 | |
553 entry_map = map(); // capture any changes performed by method setup code | |
554 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout"); | |
555 | |
556 // We begin parsing as if we have just encountered a jump to the | |
557 // method entry. | |
558 Block* entry_block = start_block(); | |
559 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), ""); | |
560 set_map_clone(entry_map); | |
561 merge_common(entry_block, entry_block->next_path_num()); | |
562 | |
563 #ifndef PRODUCT | |
564 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C); | |
565 set_parse_histogram( parse_histogram_obj ); | |
566 #endif | |
567 | |
568 // Parse all the basic blocks. | |
569 do_all_blocks(); | |
570 | |
571 C->set_default_node_notes(caller_nn); | |
572 | |
573 // Check for bailouts during conversion to graph | |
574 if (failing()) { | |
575 if (log) log->done("parse"); | |
576 return; | |
577 } | |
578 | |
579 // Fix up all exiting control flow. | |
580 set_map(entry_map); | |
581 do_exits(); | |
582 | |
583 if (log) log->done("parse nodes='%d' memory='%d'", | |
584 C->unique(), C->node_arena()->used()); | |
585 } | |
586 | |
587 //---------------------------do_all_blocks------------------------------------- | |
588 void Parse::do_all_blocks() { | |
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589 bool has_irreducible = flow()->has_irreducible_entry(); |
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590 |
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591 // Walk over all blocks in Reverse Post-Order. |
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592 while (true) { |
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593 bool progress = false; |
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594 for (int rpo = 0; rpo < block_count(); rpo++) { |
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595 Block* block = rpo_at(rpo); |
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596 |
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597 if (block->is_parsed()) continue; |
0 | 598 |
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599 if (!block->is_merged()) { |
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600 // Dead block, no state reaches this block |
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601 continue; |
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602 } |
0 | 603 |
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604 // Prepare to parse this block. |
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605 load_state_from(block); |
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606 |
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607 if (stopped()) { |
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608 // Block is dead. |
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609 continue; |
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610 } |
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611 |
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612 blocks_parsed++; |
0 | 613 |
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614 progress = true; |
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615 if (block->is_loop_head() || block->is_handler() || has_irreducible && !block->is_ready()) { |
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616 // Not all preds have been parsed. We must build phis everywhere. |
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617 // (Note that dead locals do not get phis built, ever.) |
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618 ensure_phis_everywhere(); |
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619 |
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620 // Leave behind an undisturbed copy of the map, for future merges. |
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621 set_map(clone_map()); |
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622 } |
0 | 623 |
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624 if (control()->is_Region() && !block->is_loop_head() && !has_irreducible && !block->is_handler()) { |
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625 // In the absence of irreducible loops, the Region and Phis |
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626 // associated with a merge that doesn't involve a backedge can |
605 | 627 // be simplified now since the RPO parsing order guarantees |
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628 // that any path which was supposed to reach here has already |
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629 // been parsed or must be dead. |
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630 Node* c = control(); |
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631 Node* result = _gvn.transform_no_reclaim(control()); |
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632 if (c != result && TraceOptoParse) { |
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633 tty->print_cr("Block #%d replace %d with %d", block->rpo(), c->_idx, result->_idx); |
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634 } |
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635 if (result != top()) { |
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636 record_for_igvn(result); |
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637 } |
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638 } |
0 | 639 |
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640 // Parse the block. |
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641 do_one_block(); |
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642 |
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643 // Check for bailouts. |
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644 if (failing()) return; |
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645 } |
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646 |
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647 // with irreducible loops multiple passes might be necessary to parse everything |
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648 if (!has_irreducible || !progress) { |
0 | 649 break; |
650 } | |
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651 } |
0 | 652 |
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653 blocks_seen += block_count(); |
0 | 654 |
655 #ifndef PRODUCT | |
656 // Make sure there are no half-processed blocks remaining. | |
657 // Every remaining unprocessed block is dead and may be ignored now. | |
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658 for (int rpo = 0; rpo < block_count(); rpo++) { |
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659 Block* block = rpo_at(rpo); |
0 | 660 if (!block->is_parsed()) { |
661 if (TraceOptoParse) { | |
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662 tty->print_cr("Skipped dead block %d at bci:%d", rpo, block->start()); |
0 | 663 } |
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664 assert(!block->is_merged(), "no half-processed blocks"); |
0 | 665 } |
666 } | |
667 #endif | |
668 } | |
669 | |
670 //-------------------------------build_exits---------------------------------- | |
671 // Build normal and exceptional exit merge points. | |
672 void Parse::build_exits() { | |
673 // make a clone of caller to prevent sharing of side-effects | |
674 _exits.set_map(_exits.clone_map()); | |
675 _exits.clean_stack(_exits.sp()); | |
676 _exits.sync_jvms(); | |
677 | |
678 RegionNode* region = new (C, 1) RegionNode(1); | |
679 record_for_igvn(region); | |
680 gvn().set_type_bottom(region); | |
681 _exits.set_control(region); | |
682 | |
683 // Note: iophi and memphi are not transformed until do_exits. | |
684 Node* iophi = new (C, region->req()) PhiNode(region, Type::ABIO); | |
685 Node* memphi = new (C, region->req()) PhiNode(region, Type::MEMORY, TypePtr::BOTTOM); | |
686 _exits.set_i_o(iophi); | |
687 _exits.set_all_memory(memphi); | |
688 | |
689 // Add a return value to the exit state. (Do not push it yet.) | |
690 if (tf()->range()->cnt() > TypeFunc::Parms) { | |
691 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms); | |
692 // Don't "bind" an unloaded return klass to the ret_phi. If the klass | |
693 // becomes loaded during the subsequent parsing, the loaded and unloaded | |
694 // types will not join when we transform and push in do_exits(). | |
695 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr(); | |
696 if (ret_oop_type && !ret_oop_type->klass()->is_loaded()) { | |
697 ret_type = TypeOopPtr::BOTTOM; | |
698 } | |
699 int ret_size = type2size[ret_type->basic_type()]; | |
700 Node* ret_phi = new (C, region->req()) PhiNode(region, ret_type); | |
701 _exits.ensure_stack(ret_size); | |
702 assert((int)(tf()->range()->cnt() - TypeFunc::Parms) == ret_size, "good tf range"); | |
703 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method"); | |
704 _exits.set_argument(0, ret_phi); // here is where the parser finds it | |
705 // Note: ret_phi is not yet pushed, until do_exits. | |
706 } | |
707 } | |
708 | |
709 | |
710 //----------------------------build_start_state------------------------------- | |
711 // Construct a state which contains only the incoming arguments from an | |
712 // unknown caller. The method & bci will be NULL & InvocationEntryBci. | |
713 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) { | |
714 int arg_size = tf->domain()->cnt(); | |
715 int max_size = MAX2(arg_size, (int)tf->range()->cnt()); | |
716 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms); | |
717 SafePointNode* map = new (this, max_size) SafePointNode(max_size, NULL); | |
718 record_for_igvn(map); | |
719 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size"); | |
720 Node_Notes* old_nn = default_node_notes(); | |
721 if (old_nn != NULL && has_method()) { | |
722 Node_Notes* entry_nn = old_nn->clone(this); | |
723 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms()); | |
724 entry_jvms->set_offsets(0); | |
725 entry_jvms->set_bci(entry_bci()); | |
726 entry_nn->set_jvms(entry_jvms); | |
727 set_default_node_notes(entry_nn); | |
728 } | |
729 uint i; | |
730 for (i = 0; i < (uint)arg_size; i++) { | |
731 Node* parm = initial_gvn()->transform(new (this, 1) ParmNode(start, i)); | |
732 map->init_req(i, parm); | |
733 // Record all these guys for later GVN. | |
734 record_for_igvn(parm); | |
735 } | |
736 for (; i < map->req(); i++) { | |
737 map->init_req(i, top()); | |
738 } | |
739 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here"); | |
740 set_default_node_notes(old_nn); | |
741 map->set_jvms(jvms); | |
742 jvms->set_map(map); | |
743 return jvms; | |
744 } | |
745 | |
746 //-----------------------------make_node_notes--------------------------------- | |
747 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) { | |
748 if (caller_nn == NULL) return NULL; | |
749 Node_Notes* nn = caller_nn->clone(C); | |
750 JVMState* caller_jvms = nn->jvms(); | |
751 JVMState* jvms = new (C) JVMState(method(), caller_jvms); | |
752 jvms->set_offsets(0); | |
753 jvms->set_bci(_entry_bci); | |
754 nn->set_jvms(jvms); | |
755 return nn; | |
756 } | |
757 | |
758 | |
759 //--------------------------return_values-------------------------------------- | |
760 void Compile::return_values(JVMState* jvms) { | |
761 GraphKit kit(jvms); | |
762 Node* ret = new (this, TypeFunc::Parms) ReturnNode(TypeFunc::Parms, | |
763 kit.control(), | |
764 kit.i_o(), | |
765 kit.reset_memory(), | |
766 kit.frameptr(), | |
767 kit.returnadr()); | |
768 // Add zero or 1 return values | |
769 int ret_size = tf()->range()->cnt() - TypeFunc::Parms; | |
770 if (ret_size > 0) { | |
771 kit.inc_sp(-ret_size); // pop the return value(s) | |
772 kit.sync_jvms(); | |
773 ret->add_req(kit.argument(0)); | |
774 // Note: The second dummy edge is not needed by a ReturnNode. | |
775 } | |
776 // bind it to root | |
777 root()->add_req(ret); | |
778 record_for_igvn(ret); | |
779 initial_gvn()->transform_no_reclaim(ret); | |
780 } | |
781 | |
782 //------------------------rethrow_exceptions----------------------------------- | |
783 // Bind all exception states in the list into a single RethrowNode. | |
784 void Compile::rethrow_exceptions(JVMState* jvms) { | |
785 GraphKit kit(jvms); | |
786 if (!kit.has_exceptions()) return; // nothing to generate | |
787 // Load my combined exception state into the kit, with all phis transformed: | |
788 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states(); | |
789 Node* ex_oop = kit.use_exception_state(ex_map); | |
790 RethrowNode* exit = new (this, TypeFunc::Parms + 1) RethrowNode(kit.control(), | |
791 kit.i_o(), kit.reset_memory(), | |
792 kit.frameptr(), kit.returnadr(), | |
793 // like a return but with exception input | |
794 ex_oop); | |
795 // bind to root | |
796 root()->add_req(exit); | |
797 record_for_igvn(exit); | |
798 initial_gvn()->transform_no_reclaim(exit); | |
799 } | |
800 | |
801 bool Parse::can_rerun_bytecode() { | |
802 switch (bc()) { | |
803 case Bytecodes::_ldc: | |
804 case Bytecodes::_ldc_w: | |
805 case Bytecodes::_ldc2_w: | |
806 case Bytecodes::_getfield: | |
807 case Bytecodes::_putfield: | |
808 case Bytecodes::_getstatic: | |
809 case Bytecodes::_putstatic: | |
810 case Bytecodes::_arraylength: | |
811 case Bytecodes::_baload: | |
812 case Bytecodes::_caload: | |
813 case Bytecodes::_iaload: | |
814 case Bytecodes::_saload: | |
815 case Bytecodes::_faload: | |
816 case Bytecodes::_aaload: | |
817 case Bytecodes::_laload: | |
818 case Bytecodes::_daload: | |
819 case Bytecodes::_bastore: | |
820 case Bytecodes::_castore: | |
821 case Bytecodes::_iastore: | |
822 case Bytecodes::_sastore: | |
823 case Bytecodes::_fastore: | |
824 case Bytecodes::_aastore: | |
825 case Bytecodes::_lastore: | |
826 case Bytecodes::_dastore: | |
827 case Bytecodes::_irem: | |
828 case Bytecodes::_idiv: | |
829 case Bytecodes::_lrem: | |
830 case Bytecodes::_ldiv: | |
831 case Bytecodes::_frem: | |
832 case Bytecodes::_fdiv: | |
833 case Bytecodes::_drem: | |
834 case Bytecodes::_ddiv: | |
835 case Bytecodes::_checkcast: | |
836 case Bytecodes::_instanceof: | |
837 case Bytecodes::_anewarray: | |
838 case Bytecodes::_newarray: | |
839 case Bytecodes::_multianewarray: | |
840 case Bytecodes::_new: | |
841 case Bytecodes::_monitorenter: // can re-run initial null check, only | |
842 case Bytecodes::_return: | |
843 return true; | |
844 break; | |
845 | |
1264 | 846 // Don't rerun athrow since it's part of the exception path. |
847 case Bytecodes::_athrow: | |
0 | 848 case Bytecodes::_invokestatic: |
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849 case Bytecodes::_invokedynamic: |
0 | 850 case Bytecodes::_invokespecial: |
851 case Bytecodes::_invokevirtual: | |
852 case Bytecodes::_invokeinterface: | |
853 return false; | |
854 break; | |
855 | |
856 default: | |
857 assert(false, "unexpected bytecode produced an exception"); | |
858 return true; | |
859 } | |
860 } | |
861 | |
862 //---------------------------do_exceptions------------------------------------- | |
863 // Process exceptions arising from the current bytecode. | |
864 // Send caught exceptions to the proper handler within this method. | |
865 // Unhandled exceptions feed into _exit. | |
866 void Parse::do_exceptions() { | |
867 if (!has_exceptions()) return; | |
868 | |
869 if (failing()) { | |
870 // Pop them all off and throw them away. | |
871 while (pop_exception_state() != NULL) ; | |
872 return; | |
873 } | |
874 | |
875 // Make sure we can classify this bytecode if we need to. | |
876 debug_only(can_rerun_bytecode()); | |
877 | |
878 PreserveJVMState pjvms(this, false); | |
879 | |
880 SafePointNode* ex_map; | |
881 while ((ex_map = pop_exception_state()) != NULL) { | |
882 if (!method()->has_exception_handlers()) { | |
883 // Common case: Transfer control outward. | |
884 // Doing it this early allows the exceptions to common up | |
885 // even between adjacent method calls. | |
886 throw_to_exit(ex_map); | |
887 } else { | |
888 // Have to look at the exception first. | |
889 assert(stopped(), "catch_inline_exceptions trashes the map"); | |
890 catch_inline_exceptions(ex_map); | |
891 stop_and_kill_map(); // we used up this exception state; kill it | |
892 } | |
893 } | |
894 | |
895 // We now return to our regularly scheduled program: | |
896 } | |
897 | |
898 //---------------------------throw_to_exit------------------------------------- | |
899 // Merge the given map into an exception exit from this method. | |
900 // The exception exit will handle any unlocking of receiver. | |
901 // The ex_oop must be saved within the ex_map, unlike merge_exception. | |
902 void Parse::throw_to_exit(SafePointNode* ex_map) { | |
903 // Pop the JVMS to (a copy of) the caller. | |
904 GraphKit caller; | |
905 caller.set_map_clone(_caller->map()); | |
906 caller.set_bci(_caller->bci()); | |
907 caller.set_sp(_caller->sp()); | |
908 // Copy out the standard machine state: | |
909 for (uint i = 0; i < TypeFunc::Parms; i++) { | |
910 caller.map()->set_req(i, ex_map->in(i)); | |
911 } | |
912 // ...and the exception: | |
913 Node* ex_oop = saved_ex_oop(ex_map); | |
914 SafePointNode* caller_ex_map = caller.make_exception_state(ex_oop); | |
915 // Finally, collect the new exception state in my exits: | |
916 _exits.add_exception_state(caller_ex_map); | |
917 } | |
918 | |
919 //------------------------------do_exits--------------------------------------- | |
920 void Parse::do_exits() { | |
921 set_parse_bci(InvocationEntryBci); | |
922 | |
923 // Now peephole on the return bits | |
924 Node* region = _exits.control(); | |
925 _exits.set_control(gvn().transform(region)); | |
926 | |
927 Node* iophi = _exits.i_o(); | |
928 _exits.set_i_o(gvn().transform(iophi)); | |
929 | |
930 if (wrote_final()) { | |
931 // This method (which must be a constructor by the rules of Java) | |
932 // wrote a final. The effects of all initializations must be | |
933 // committed to memory before any code after the constructor | |
934 // publishes the reference to the newly constructor object. | |
935 // Rather than wait for the publication, we simply block the | |
936 // writes here. Rather than put a barrier on only those writes | |
937 // which are required to complete, we force all writes to complete. | |
938 // | |
939 // "All bets are off" unless the first publication occurs after a | |
940 // normal return from the constructor. We do not attempt to detect | |
941 // such unusual early publications. But no barrier is needed on | |
942 // exceptional returns, since they cannot publish normally. | |
943 // | |
944 _exits.insert_mem_bar(Op_MemBarRelease); | |
945 #ifndef PRODUCT | |
946 if (PrintOpto && (Verbose || WizardMode)) { | |
947 method()->print_name(); | |
948 tty->print_cr(" writes finals and needs a memory barrier"); | |
949 } | |
950 #endif | |
951 } | |
952 | |
953 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) { | |
954 // transform each slice of the original memphi: | |
955 mms.set_memory(_gvn.transform(mms.memory())); | |
956 } | |
957 | |
958 if (tf()->range()->cnt() > TypeFunc::Parms) { | |
959 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms); | |
960 Node* ret_phi = _gvn.transform( _exits.argument(0) ); | |
961 assert(_exits.control()->is_top() || !_gvn.type(ret_phi)->empty(), "return value must be well defined"); | |
962 _exits.push_node(ret_type->basic_type(), ret_phi); | |
963 } | |
964 | |
965 // Note: Logic for creating and optimizing the ReturnNode is in Compile. | |
966 | |
967 // Unlock along the exceptional paths. | |
968 // This is done late so that we can common up equivalent exceptions | |
969 // (e.g., null checks) arising from multiple points within this method. | |
970 // See GraphKit::add_exception_state, which performs the commoning. | |
971 bool do_synch = method()->is_synchronized() && GenerateSynchronizationCode; | |
972 | |
973 // record exit from a method if compiled while Dtrace is turned on. | |
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974 if (do_synch || C->env()->dtrace_method_probes()) { |
0 | 975 // First move the exception list out of _exits: |
976 GraphKit kit(_exits.transfer_exceptions_into_jvms()); | |
977 SafePointNode* normal_map = kit.map(); // keep this guy safe | |
978 // Now re-collect the exceptions into _exits: | |
979 SafePointNode* ex_map; | |
980 while ((ex_map = kit.pop_exception_state()) != NULL) { | |
981 Node* ex_oop = kit.use_exception_state(ex_map); | |
982 // Force the exiting JVM state to have this method at InvocationEntryBci. | |
983 // The exiting JVM state is otherwise a copy of the calling JVMS. | |
984 JVMState* caller = kit.jvms(); | |
985 JVMState* ex_jvms = caller->clone_shallow(C); | |
986 ex_jvms->set_map(kit.clone_map()); | |
987 ex_jvms->map()->set_jvms(ex_jvms); | |
988 ex_jvms->set_bci( InvocationEntryBci); | |
989 kit.set_jvms(ex_jvms); | |
990 if (do_synch) { | |
991 // Add on the synchronized-method box/object combo | |
992 kit.map()->push_monitor(_synch_lock); | |
993 // Unlock! | |
994 kit.shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node()); | |
995 } | |
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996 if (C->env()->dtrace_method_probes()) { |
0 | 997 kit.make_dtrace_method_exit(method()); |
998 } | |
999 // Done with exception-path processing. | |
1000 ex_map = kit.make_exception_state(ex_oop); | |
1001 assert(ex_jvms->same_calls_as(ex_map->jvms()), "sanity"); | |
1002 // Pop the last vestige of this method: | |
1003 ex_map->set_jvms(caller->clone_shallow(C)); | |
1004 ex_map->jvms()->set_map(ex_map); | |
1005 _exits.push_exception_state(ex_map); | |
1006 } | |
1007 assert(_exits.map() == normal_map, "keep the same return state"); | |
1008 } | |
1009 | |
1010 { | |
1011 // Capture very early exceptions (receiver null checks) from caller JVMS | |
1012 GraphKit caller(_caller); | |
1013 SafePointNode* ex_map; | |
1014 while ((ex_map = caller.pop_exception_state()) != NULL) { | |
1015 _exits.add_exception_state(ex_map); | |
1016 } | |
1017 } | |
1018 } | |
1019 | |
1020 //-----------------------------create_entry_map------------------------------- | |
1021 // Initialize our parser map to contain the types at method entry. | |
1022 // For OSR, the map contains a single RawPtr parameter. | |
1023 // Initial monitor locking for sync. methods is performed by do_method_entry. | |
1024 SafePointNode* Parse::create_entry_map() { | |
1025 // Check for really stupid bail-out cases. | |
1026 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack(); | |
1027 if (len >= 32760) { | |
1028 C->record_method_not_compilable_all_tiers("too many local variables"); | |
1029 return NULL; | |
1030 } | |
1031 | |
1032 // If this is an inlined method, we may have to do a receiver null check. | |
1033 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) { | |
1034 GraphKit kit(_caller); | |
1035 kit.null_check_receiver(method()); | |
1036 _caller = kit.transfer_exceptions_into_jvms(); | |
1037 if (kit.stopped()) { | |
1038 _exits.add_exception_states_from(_caller); | |
1039 _exits.set_jvms(_caller); | |
1040 return NULL; | |
1041 } | |
1042 } | |
1043 | |
1044 assert(method() != NULL, "parser must have a method"); | |
1045 | |
1046 // Create an initial safepoint to hold JVM state during parsing | |
1047 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : NULL); | |
1048 set_map(new (C, len) SafePointNode(len, jvms)); | |
1049 jvms->set_map(map()); | |
1050 record_for_igvn(map()); | |
1051 assert(jvms->endoff() == len, "correct jvms sizing"); | |
1052 | |
1053 SafePointNode* inmap = _caller->map(); | |
1054 assert(inmap != NULL, "must have inmap"); | |
1055 | |
1056 uint i; | |
1057 | |
1058 // Pass thru the predefined input parameters. | |
1059 for (i = 0; i < TypeFunc::Parms; i++) { | |
1060 map()->init_req(i, inmap->in(i)); | |
1061 } | |
1062 | |
1063 if (depth() == 1) { | |
1064 assert(map()->memory()->Opcode() == Op_Parm, ""); | |
1065 // Insert the memory aliasing node | |
1066 set_all_memory(reset_memory()); | |
1067 } | |
1068 assert(merged_memory(), ""); | |
1069 | |
1070 // Now add the locals which are initially bound to arguments: | |
1071 uint arg_size = tf()->domain()->cnt(); | |
1072 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args | |
1073 for (i = TypeFunc::Parms; i < arg_size; i++) { | |
1074 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms)); | |
1075 } | |
1076 | |
1077 // Clear out the rest of the map (locals and stack) | |
1078 for (i = arg_size; i < len; i++) { | |
1079 map()->init_req(i, top()); | |
1080 } | |
1081 | |
1082 SafePointNode* entry_map = stop(); | |
1083 return entry_map; | |
1084 } | |
1085 | |
1086 //-----------------------------do_method_entry-------------------------------- | |
1087 // Emit any code needed in the pseudo-block before BCI zero. | |
1088 // The main thing to do is lock the receiver of a synchronized method. | |
1089 void Parse::do_method_entry() { | |
1090 set_parse_bci(InvocationEntryBci); // Pseudo-BCP | |
1091 set_sp(0); // Java Stack Pointer | |
1092 | |
1093 NOT_PRODUCT( count_compiled_calls(true/*at_method_entry*/, false/*is_inline*/); ) | |
1094 | |
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1095 if (C->env()->dtrace_method_probes()) { |
0 | 1096 make_dtrace_method_entry(method()); |
1097 } | |
1098 | |
1099 // If the method is synchronized, we need to construct a lock node, attach | |
1100 // it to the Start node, and pin it there. | |
1101 if (method()->is_synchronized()) { | |
1102 // Insert a FastLockNode right after the Start which takes as arguments | |
1103 // the current thread pointer, the "this" pointer & the address of the | |
1104 // stack slot pair used for the lock. The "this" pointer is a projection | |
1105 // off the start node, but the locking spot has to be constructed by | |
1106 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode | |
1107 // becomes the second argument to the FastLockNode call. The | |
1108 // FastLockNode becomes the new control parent to pin it to the start. | |
1109 | |
1110 // Setup Object Pointer | |
1111 Node *lock_obj = NULL; | |
1112 if(method()->is_static()) { | |
1113 ciInstance* mirror = _method->holder()->java_mirror(); | |
1114 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror); | |
1115 lock_obj = makecon(t_lock); | |
1116 } else { // Else pass the "this" pointer, | |
1117 lock_obj = local(0); // which is Parm0 from StartNode | |
1118 } | |
1119 // Clear out dead values from the debug info. | |
1120 kill_dead_locals(); | |
1121 // Build the FastLockNode | |
1122 _synch_lock = shared_lock(lock_obj); | |
1123 } | |
1124 | |
1125 if (depth() == 1) { | |
1126 increment_and_test_invocation_counter(Tier2CompileThreshold); | |
1127 } | |
1128 } | |
1129 | |
1130 //------------------------------init_blocks------------------------------------ | |
1131 // Initialize our parser map to contain the types/monitors at method entry. | |
1132 void Parse::init_blocks() { | |
1133 // Create the blocks. | |
1134 _block_count = flow()->block_count(); | |
1135 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count); | |
1136 Copy::zero_to_bytes(_blocks, sizeof(Block)*_block_count); | |
1137 | |
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1138 int rpo; |
0 | 1139 |
1140 // Initialize the structs. | |
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1141 for (rpo = 0; rpo < block_count(); rpo++) { |
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1142 Block* block = rpo_at(rpo); |
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1143 block->init_node(this, rpo); |
0 | 1144 } |
1145 | |
1146 // Collect predecessor and successor information. | |
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1147 for (rpo = 0; rpo < block_count(); rpo++) { |
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1148 Block* block = rpo_at(rpo); |
0 | 1149 block->init_graph(this); |
1150 } | |
1151 } | |
1152 | |
1153 //-------------------------------init_node------------------------------------- | |
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1154 void Parse::Block::init_node(Parse* outer, int rpo) { |
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1155 _flow = outer->flow()->rpo_at(rpo); |
0 | 1156 _pred_count = 0; |
1157 _preds_parsed = 0; | |
1158 _count = 0; | |
1159 assert(pred_count() == 0 && preds_parsed() == 0, "sanity"); | |
1160 assert(!(is_merged() || is_parsed() || is_handler()), "sanity"); | |
1161 assert(_live_locals.size() == 0, "sanity"); | |
1162 | |
1163 // entry point has additional predecessor | |
1164 if (flow()->is_start()) _pred_count++; | |
1165 assert(flow()->is_start() == (this == outer->start_block()), ""); | |
1166 } | |
1167 | |
1168 //-------------------------------init_graph------------------------------------ | |
1169 void Parse::Block::init_graph(Parse* outer) { | |
1170 // Create the successor list for this parser block. | |
1171 GrowableArray<ciTypeFlow::Block*>* tfs = flow()->successors(); | |
1172 GrowableArray<ciTypeFlow::Block*>* tfe = flow()->exceptions(); | |
1173 int ns = tfs->length(); | |
1174 int ne = tfe->length(); | |
1175 _num_successors = ns; | |
1176 _all_successors = ns+ne; | |
1177 _successors = (ns+ne == 0) ? NULL : NEW_RESOURCE_ARRAY(Block*, ns+ne); | |
1178 int p = 0; | |
1179 for (int i = 0; i < ns+ne; i++) { | |
1180 ciTypeFlow::Block* tf2 = (i < ns) ? tfs->at(i) : tfe->at(i-ns); | |
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1181 Block* block2 = outer->rpo_at(tf2->rpo()); |
0 | 1182 _successors[i] = block2; |
1183 | |
1184 // Accumulate pred info for the other block, too. | |
1185 if (i < ns) { | |
1186 block2->_pred_count++; | |
1187 } else { | |
1188 block2->_is_handler = true; | |
1189 } | |
1190 | |
1191 #ifdef ASSERT | |
1192 // A block's successors must be distinguishable by BCI. | |
1193 // That is, no bytecode is allowed to branch to two different | |
1194 // clones of the same code location. | |
1195 for (int j = 0; j < i; j++) { | |
1196 Block* block1 = _successors[j]; | |
1197 if (block1 == block2) continue; // duplicates are OK | |
1198 assert(block1->start() != block2->start(), "successors have unique bcis"); | |
1199 } | |
1200 #endif | |
1201 } | |
1202 | |
1203 // Note: We never call next_path_num along exception paths, so they | |
1204 // never get processed as "ready". Also, the input phis of exception | |
1205 // handlers get specially processed, so that | |
1206 } | |
1207 | |
1208 //---------------------------successor_for_bci--------------------------------- | |
1209 Parse::Block* Parse::Block::successor_for_bci(int bci) { | |
1210 for (int i = 0; i < all_successors(); i++) { | |
1211 Block* block2 = successor_at(i); | |
1212 if (block2->start() == bci) return block2; | |
1213 } | |
1214 // We can actually reach here if ciTypeFlow traps out a block | |
1215 // due to an unloaded class, and concurrently with compilation the | |
1216 // class is then loaded, so that a later phase of the parser is | |
1217 // able to see more of the bytecode CFG. Or, the flow pass and | |
1218 // the parser can have a minor difference of opinion about executability | |
1219 // of bytecodes. For example, "obj.field = null" is executable even | |
1220 // if the field's type is an unloaded class; the flow pass used to | |
1221 // make a trap for such code. | |
1222 return NULL; | |
1223 } | |
1224 | |
1225 | |
1226 //-----------------------------stack_type_at----------------------------------- | |
1227 const Type* Parse::Block::stack_type_at(int i) const { | |
1228 return get_type(flow()->stack_type_at(i)); | |
1229 } | |
1230 | |
1231 | |
1232 //-----------------------------local_type_at----------------------------------- | |
1233 const Type* Parse::Block::local_type_at(int i) const { | |
1234 // Make dead locals fall to bottom. | |
1235 if (_live_locals.size() == 0) { | |
1236 MethodLivenessResult live_locals = flow()->outer()->method()->liveness_at_bci(start()); | |
1237 // This bitmap can be zero length if we saw a breakpoint. | |
1238 // In such cases, pretend they are all live. | |
1239 ((Block*)this)->_live_locals = live_locals; | |
1240 } | |
1241 if (_live_locals.size() > 0 && !_live_locals.at(i)) | |
1242 return Type::BOTTOM; | |
1243 | |
1244 return get_type(flow()->local_type_at(i)); | |
1245 } | |
1246 | |
1247 | |
1248 #ifndef PRODUCT | |
1249 | |
1250 //----------------------------name_for_bc-------------------------------------- | |
1251 // helper method for BytecodeParseHistogram | |
1252 static const char* name_for_bc(int i) { | |
1253 return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx"; | |
1254 } | |
1255 | |
1256 //----------------------------BytecodeParseHistogram------------------------------------ | |
1257 Parse::BytecodeParseHistogram::BytecodeParseHistogram(Parse *p, Compile *c) { | |
1258 _parser = p; | |
1259 _compiler = c; | |
1260 if( ! _initialized ) { _initialized = true; reset(); } | |
1261 } | |
1262 | |
1263 //----------------------------current_count------------------------------------ | |
1264 int Parse::BytecodeParseHistogram::current_count(BPHType bph_type) { | |
1265 switch( bph_type ) { | |
1266 case BPH_transforms: { return _parser->gvn().made_progress(); } | |
1267 case BPH_values: { return _parser->gvn().made_new_values(); } | |
1268 default: { ShouldNotReachHere(); return 0; } | |
1269 } | |
1270 } | |
1271 | |
1272 //----------------------------initialized-------------------------------------- | |
1273 bool Parse::BytecodeParseHistogram::initialized() { return _initialized; } | |
1274 | |
1275 //----------------------------reset-------------------------------------------- | |
1276 void Parse::BytecodeParseHistogram::reset() { | |
1277 int i = Bytecodes::number_of_codes; | |
1278 while (i-- > 0) { _bytecodes_parsed[i] = 0; _nodes_constructed[i] = 0; _nodes_transformed[i] = 0; _new_values[i] = 0; } | |
1279 } | |
1280 | |
1281 //----------------------------set_initial_state-------------------------------- | |
1282 // Record info when starting to parse one bytecode | |
1283 void Parse::BytecodeParseHistogram::set_initial_state( Bytecodes::Code bc ) { | |
1284 if( PrintParseStatistics && !_parser->is_osr_parse() ) { | |
1285 _initial_bytecode = bc; | |
1286 _initial_node_count = _compiler->unique(); | |
1287 _initial_transforms = current_count(BPH_transforms); | |
1288 _initial_values = current_count(BPH_values); | |
1289 } | |
1290 } | |
1291 | |
1292 //----------------------------record_change-------------------------------- | |
1293 // Record results of parsing one bytecode | |
1294 void Parse::BytecodeParseHistogram::record_change() { | |
1295 if( PrintParseStatistics && !_parser->is_osr_parse() ) { | |
1296 ++_bytecodes_parsed[_initial_bytecode]; | |
1297 _nodes_constructed [_initial_bytecode] += (_compiler->unique() - _initial_node_count); | |
1298 _nodes_transformed [_initial_bytecode] += (current_count(BPH_transforms) - _initial_transforms); | |
1299 _new_values [_initial_bytecode] += (current_count(BPH_values) - _initial_values); | |
1300 } | |
1301 } | |
1302 | |
1303 | |
1304 //----------------------------print-------------------------------------------- | |
1305 void Parse::BytecodeParseHistogram::print(float cutoff) { | |
1306 ResourceMark rm; | |
1307 // print profile | |
1308 int total = 0; | |
1309 int i = 0; | |
1310 for( i = 0; i < Bytecodes::number_of_codes; ++i ) { total += _bytecodes_parsed[i]; } | |
1311 int abs_sum = 0; | |
1312 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789 | |
1313 tty->print_cr("Histogram of %d parsed bytecodes:", total); | |
1314 if( total == 0 ) { return; } | |
1315 tty->cr(); | |
1316 tty->print_cr("absolute: count of compiled bytecodes of this type"); | |
1317 tty->print_cr("relative: percentage contribution to compiled nodes"); | |
1318 tty->print_cr("nodes : Average number of nodes constructed per bytecode"); | |
1319 tty->print_cr("rnodes : Significance towards total nodes constructed, (nodes*relative)"); | |
1320 tty->print_cr("transforms: Average amount of tranform progress per bytecode compiled"); | |
1321 tty->print_cr("values : Average number of node values improved per bytecode"); | |
1322 tty->print_cr("name : Bytecode name"); | |
1323 tty->cr(); | |
1324 tty->print_cr(" absolute relative nodes rnodes transforms values name"); | |
1325 tty->print_cr("----------------------------------------------------------------------"); | |
1326 while (--i > 0) { | |
1327 int abs = _bytecodes_parsed[i]; | |
1328 float rel = abs * 100.0F / total; | |
1329 float nodes = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_constructed[i])/_bytecodes_parsed[i]; | |
1330 float rnodes = _bytecodes_parsed[i] == 0 ? 0 : rel * nodes; | |
1331 float xforms = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_transformed[i])/_bytecodes_parsed[i]; | |
1332 float values = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _new_values [i])/_bytecodes_parsed[i]; | |
1333 if (cutoff <= rel) { | |
1334 tty->print_cr("%10d %7.2f%% %6.1f %6.2f %6.1f %6.1f %s", abs, rel, nodes, rnodes, xforms, values, name_for_bc(i)); | |
1335 abs_sum += abs; | |
1336 } | |
1337 } | |
1338 tty->print_cr("----------------------------------------------------------------------"); | |
1339 float rel_sum = abs_sum * 100.0F / total; | |
1340 tty->print_cr("%10d %7.2f%% (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff); | |
1341 tty->print_cr("----------------------------------------------------------------------"); | |
1342 tty->cr(); | |
1343 } | |
1344 #endif | |
1345 | |
1346 //----------------------------load_state_from---------------------------------- | |
1347 // Load block/map/sp. But not do not touch iter/bci. | |
1348 void Parse::load_state_from(Block* block) { | |
1349 set_block(block); | |
1350 // load the block's JVM state: | |
1351 set_map(block->start_map()); | |
1352 set_sp( block->start_sp()); | |
1353 } | |
1354 | |
1355 | |
1356 //-----------------------------record_state------------------------------------ | |
1357 void Parse::Block::record_state(Parse* p) { | |
1358 assert(!is_merged(), "can only record state once, on 1st inflow"); | |
1359 assert(start_sp() == p->sp(), "stack pointer must agree with ciTypeFlow"); | |
1360 set_start_map(p->stop()); | |
1361 } | |
1362 | |
1363 | |
1364 //------------------------------do_one_block----------------------------------- | |
1365 void Parse::do_one_block() { | |
1366 if (TraceOptoParse) { | |
1367 Block *b = block(); | |
1368 int ns = b->num_successors(); | |
1369 int nt = b->all_successors(); | |
1370 | |
1371 tty->print("Parsing block #%d at bci [%d,%d), successors: ", | |
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1372 block()->rpo(), block()->start(), block()->limit()); |
0 | 1373 for (int i = 0; i < nt; i++) { |
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1374 tty->print((( i < ns) ? " %d" : " %d(e)"), b->successor_at(i)->rpo()); |
0 | 1375 } |
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1376 if (b->is_loop_head()) tty->print(" lphd"); |
0 | 1377 tty->print_cr(""); |
1378 } | |
1379 | |
1380 assert(block()->is_merged(), "must be merged before being parsed"); | |
1381 block()->mark_parsed(); | |
1382 ++_blocks_parsed; | |
1383 | |
1384 // Set iterator to start of block. | |
1385 iter().reset_to_bci(block()->start()); | |
1386 | |
1387 CompileLog* log = C->log(); | |
1388 | |
1389 // Parse bytecodes | |
1390 while (!stopped() && !failing()) { | |
1391 iter().next(); | |
1392 | |
1393 // Learn the current bci from the iterator: | |
1394 set_parse_bci(iter().cur_bci()); | |
1395 | |
1396 if (bci() == block()->limit()) { | |
1172 | 1397 // insert a predicate if it falls through to a loop head block |
1398 if (should_add_predicate(bci())){ | |
1399 add_predicate(); | |
1400 } | |
0 | 1401 // Do not walk into the next block until directed by do_all_blocks. |
1402 merge(bci()); | |
1403 break; | |
1404 } | |
1405 assert(bci() < block()->limit(), "bci still in block"); | |
1406 | |
1407 if (log != NULL) { | |
1408 // Output an optional context marker, to help place actions | |
1409 // that occur during parsing of this BC. If there is no log | |
1410 // output until the next context string, this context string | |
1411 // will be silently ignored. | |
1412 log->context()->reset(); | |
1413 log->context()->print_cr("<bc code='%d' bci='%d'/>", (int)bc(), bci()); | |
1414 } | |
1415 | |
1416 if (block()->has_trap_at(bci())) { | |
1417 // We must respect the flow pass's traps, because it will refuse | |
1418 // to produce successors for trapping blocks. | |
1419 int trap_index = block()->flow()->trap_index(); | |
1420 assert(trap_index != 0, "trap index must be valid"); | |
1421 uncommon_trap(trap_index); | |
1422 break; | |
1423 } | |
1424 | |
1425 NOT_PRODUCT( parse_histogram()->set_initial_state(bc()); ); | |
1426 | |
1427 #ifdef ASSERT | |
1428 int pre_bc_sp = sp(); | |
1429 int inputs, depth; | |
1430 bool have_se = !stopped() && compute_stack_effects(inputs, depth); | |
1431 assert(!have_se || pre_bc_sp >= inputs, "have enough stack to execute this BC"); | |
1432 #endif //ASSERT | |
1433 | |
1434 do_one_bytecode(); | |
1435 | |
1436 assert(!have_se || stopped() || failing() || (sp() - pre_bc_sp) == depth, "correct depth prediction"); | |
1437 | |
1438 do_exceptions(); | |
1439 | |
1440 NOT_PRODUCT( parse_histogram()->record_change(); ); | |
1441 | |
1442 if (log != NULL) log->context()->reset(); // done w/ this one | |
1443 | |
1444 // Fall into next bytecode. Each bytecode normally has 1 sequential | |
1445 // successor which is typically made ready by visiting this bytecode. | |
1446 // If the successor has several predecessors, then it is a merge | |
1447 // point, starts a new basic block, and is handled like other basic blocks. | |
1448 } | |
1449 } | |
1450 | |
1451 | |
1452 //------------------------------merge------------------------------------------ | |
1453 void Parse::set_parse_bci(int bci) { | |
1454 set_bci(bci); | |
1455 Node_Notes* nn = C->default_node_notes(); | |
1456 if (nn == NULL) return; | |
1457 | |
1458 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls. | |
1459 if (!DebugInlinedCalls && depth() > 1) { | |
1460 return; | |
1461 } | |
1462 | |
1463 // Update the JVMS annotation, if present. | |
1464 JVMState* jvms = nn->jvms(); | |
1465 if (jvms != NULL && jvms->bci() != bci) { | |
1466 // Update the JVMS. | |
1467 jvms = jvms->clone_shallow(C); | |
1468 jvms->set_bci(bci); | |
1469 nn->set_jvms(jvms); | |
1470 } | |
1471 } | |
1472 | |
1473 //------------------------------merge------------------------------------------ | |
1474 // Merge the current mapping into the basic block starting at bci | |
1475 void Parse::merge(int target_bci) { | |
1476 Block* target = successor_for_bci(target_bci); | |
1477 if (target == NULL) { handle_missing_successor(target_bci); return; } | |
1478 assert(!target->is_ready(), "our arrival must be expected"); | |
1479 int pnum = target->next_path_num(); | |
1480 merge_common(target, pnum); | |
1481 } | |
1482 | |
1483 //-------------------------merge_new_path-------------------------------------- | |
1484 // Merge the current mapping into the basic block, using a new path | |
1485 void Parse::merge_new_path(int target_bci) { | |
1486 Block* target = successor_for_bci(target_bci); | |
1487 if (target == NULL) { handle_missing_successor(target_bci); return; } | |
1488 assert(!target->is_ready(), "new path into frozen graph"); | |
1489 int pnum = target->add_new_path(); | |
1490 merge_common(target, pnum); | |
1491 } | |
1492 | |
1493 //-------------------------merge_exception------------------------------------- | |
1494 // Merge the current mapping into the basic block starting at bci | |
1495 // The ex_oop must be pushed on the stack, unlike throw_to_exit. | |
1496 void Parse::merge_exception(int target_bci) { | |
1497 assert(sp() == 1, "must have only the throw exception on the stack"); | |
1498 Block* target = successor_for_bci(target_bci); | |
1499 if (target == NULL) { handle_missing_successor(target_bci); return; } | |
1500 assert(target->is_handler(), "exceptions are handled by special blocks"); | |
1501 int pnum = target->add_new_path(); | |
1502 merge_common(target, pnum); | |
1503 } | |
1504 | |
1505 //--------------------handle_missing_successor--------------------------------- | |
1506 void Parse::handle_missing_successor(int target_bci) { | |
1507 #ifndef PRODUCT | |
1508 Block* b = block(); | |
1509 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1; | |
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1510 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci); |
0 | 1511 #endif |
1512 ShouldNotReachHere(); | |
1513 } | |
1514 | |
1515 //--------------------------merge_common--------------------------------------- | |
1516 void Parse::merge_common(Parse::Block* target, int pnum) { | |
1517 if (TraceOptoParse) { | |
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1518 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start()); |
0 | 1519 } |
1520 | |
1521 // Zap extra stack slots to top | |
1522 assert(sp() == target->start_sp(), ""); | |
1523 clean_stack(sp()); | |
1524 | |
1525 if (!target->is_merged()) { // No prior mapping at this bci | |
1526 if (TraceOptoParse) { tty->print(" with empty state"); } | |
1527 | |
1528 // If this path is dead, do not bother capturing it as a merge. | |
1529 // It is "as if" we had 1 fewer predecessors from the beginning. | |
1530 if (stopped()) { | |
1531 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count"); | |
1532 return; | |
1533 } | |
1534 | |
1535 // Record that a new block has been merged. | |
1536 ++_blocks_merged; | |
1537 | |
1538 // Make a region if we know there are multiple or unpredictable inputs. | |
1539 // (Also, if this is a plain fall-through, we might see another region, | |
1540 // which must not be allowed into this block's map.) | |
1541 if (pnum > PhiNode::Input // Known multiple inputs. | |
1542 || target->is_handler() // These have unpredictable inputs. | |
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1543 || target->is_loop_head() // Known multiple inputs |
0 | 1544 || control()->is_Region()) { // We must hide this guy. |
1545 // Add a Region to start the new basic block. Phis will be added | |
1546 // later lazily. | |
1547 int edges = target->pred_count(); | |
1548 if (edges < pnum) edges = pnum; // might be a new path! | |
1549 Node *r = new (C, edges+1) RegionNode(edges+1); | |
1550 gvn().set_type(r, Type::CONTROL); | |
1551 record_for_igvn(r); | |
1552 // zap all inputs to NULL for debugging (done in Node(uint) constructor) | |
1553 // for (int j = 1; j < edges+1; j++) { r->init_req(j, NULL); } | |
1554 r->init_req(pnum, control()); | |
1555 set_control(r); | |
1556 } | |
1557 | |
1558 // Convert the existing Parser mapping into a mapping at this bci. | |
1559 store_state_to(target); | |
1560 assert(target->is_merged(), "do not come here twice"); | |
1561 | |
1562 } else { // Prior mapping at this bci | |
1563 if (TraceOptoParse) { tty->print(" with previous state"); } | |
1564 | |
1565 // We must not manufacture more phis if the target is already parsed. | |
1566 bool nophi = target->is_parsed(); | |
1567 | |
1568 SafePointNode* newin = map();// Hang on to incoming mapping | |
1569 Block* save_block = block(); // Hang on to incoming block; | |
1570 load_state_from(target); // Get prior mapping | |
1571 | |
1572 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree"); | |
1573 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree"); | |
1574 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree"); | |
1575 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree"); | |
1576 | |
1577 // Iterate over my current mapping and the old mapping. | |
1578 // Where different, insert Phi functions. | |
1579 // Use any existing Phi functions. | |
1580 assert(control()->is_Region(), "must be merging to a region"); | |
1581 RegionNode* r = control()->as_Region(); | |
1582 | |
1583 // Compute where to merge into | |
1584 // Merge incoming control path | |
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1585 r->init_req(pnum, newin->control()); |
0 | 1586 |
1587 if (pnum == 1) { // Last merge for this Region? | |
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1588 if (!block()->flow()->is_irreducible_entry()) { |
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1589 Node* result = _gvn.transform_no_reclaim(r); |
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1590 if (r != result && TraceOptoParse) { |
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1591 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx); |
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1592 } |
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1593 } |
0 | 1594 record_for_igvn(r); |
1595 } | |
1596 | |
1597 // Update all the non-control inputs to map: | |
1598 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms"); | |
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1599 bool check_elide_phi = target->is_SEL_backedge(save_block); |
0 | 1600 for (uint j = 1; j < newin->req(); j++) { |
1601 Node* m = map()->in(j); // Current state of target. | |
1602 Node* n = newin->in(j); // Incoming change to target state. | |
1603 PhiNode* phi; | |
1604 if (m->is_Phi() && m->as_Phi()->region() == r) | |
1605 phi = m->as_Phi(); | |
1606 else | |
1607 phi = NULL; | |
1608 if (m != n) { // Different; must merge | |
1609 switch (j) { | |
1610 // Frame pointer and Return Address never changes | |
1611 case TypeFunc::FramePtr:// Drop m, use the original value | |
1612 case TypeFunc::ReturnAdr: | |
1613 break; | |
1614 case TypeFunc::Memory: // Merge inputs to the MergeMem node | |
1615 assert(phi == NULL, "the merge contains phis, not vice versa"); | |
1616 merge_memory_edges(n->as_MergeMem(), pnum, nophi); | |
1617 continue; | |
1618 default: // All normal stuff | |
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1619 if (phi == NULL) { |
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1620 if (!check_elide_phi || !target->can_elide_SEL_phi(j)) { |
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1621 phi = ensure_phi(j, nophi); |
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1622 } |
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1623 } |
0 | 1624 break; |
1625 } | |
1626 } | |
1627 // At this point, n might be top if: | |
1628 // - there is no phi (because TypeFlow detected a conflict), or | |
1629 // - the corresponding control edges is top (a dead incoming path) | |
1630 // It is a bug if we create a phi which sees a garbage value on a live path. | |
1631 | |
1632 if (phi != NULL) { | |
1633 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage"); | |
1634 assert(phi->region() == r, ""); | |
1635 phi->set_req(pnum, n); // Then add 'n' to the merge | |
1636 if (pnum == PhiNode::Input) { | |
1637 // Last merge for this Phi. | |
1638 // So far, Phis have had a reasonable type from ciTypeFlow. | |
1639 // Now _gvn will join that with the meet of current inputs. | |
1640 // BOTTOM is never permissible here, 'cause pessimistically | |
1641 // Phis of pointers cannot lose the basic pointer type. | |
1642 debug_only(const Type* bt1 = phi->bottom_type()); | |
1643 assert(bt1 != Type::BOTTOM, "should not be building conflict phis"); | |
1644 map()->set_req(j, _gvn.transform_no_reclaim(phi)); | |
1645 debug_only(const Type* bt2 = phi->bottom_type()); | |
1646 assert(bt2->higher_equal(bt1), "must be consistent with type-flow"); | |
1647 record_for_igvn(phi); | |
1648 } | |
1649 } | |
1650 } // End of for all values to be merged | |
1651 | |
1652 if (pnum == PhiNode::Input && | |
1653 !r->in(0)) { // The occasional useless Region | |
1654 assert(control() == r, ""); | |
1655 set_control(r->nonnull_req()); | |
1656 } | |
1657 | |
1658 // newin has been subsumed into the lazy merge, and is now dead. | |
1659 set_block(save_block); | |
1660 | |
1661 stop(); // done with this guy, for now | |
1662 } | |
1663 | |
1664 if (TraceOptoParse) { | |
1665 tty->print_cr(" on path %d", pnum); | |
1666 } | |
1667 | |
1668 // Done with this parser state. | |
1669 assert(stopped(), ""); | |
1670 } | |
1671 | |
1672 | |
1673 //--------------------------merge_memory_edges--------------------------------- | |
1674 void Parse::merge_memory_edges(MergeMemNode* n, int pnum, bool nophi) { | |
1675 // (nophi means we must not create phis, because we already parsed here) | |
1676 assert(n != NULL, ""); | |
1677 // Merge the inputs to the MergeMems | |
1678 MergeMemNode* m = merged_memory(); | |
1679 | |
1680 assert(control()->is_Region(), "must be merging to a region"); | |
1681 RegionNode* r = control()->as_Region(); | |
1682 | |
1683 PhiNode* base = NULL; | |
1684 MergeMemNode* remerge = NULL; | |
1685 for (MergeMemStream mms(m, n); mms.next_non_empty2(); ) { | |
1686 Node *p = mms.force_memory(); | |
1687 Node *q = mms.memory2(); | |
1688 if (mms.is_empty() && nophi) { | |
1689 // Trouble: No new splits allowed after a loop body is parsed. | |
1690 // Instead, wire the new split into a MergeMem on the backedge. | |
1691 // The optimizer will sort it out, slicing the phi. | |
1692 if (remerge == NULL) { | |
1693 assert(base != NULL, ""); | |
1694 assert(base->in(0) != NULL, "should not be xformed away"); | |
1695 remerge = MergeMemNode::make(C, base->in(pnum)); | |
1696 gvn().set_type(remerge, Type::MEMORY); | |
1697 base->set_req(pnum, remerge); | |
1698 } | |
1699 remerge->set_memory_at(mms.alias_idx(), q); | |
1700 continue; | |
1701 } | |
1702 assert(!q->is_MergeMem(), ""); | |
1703 PhiNode* phi; | |
1704 if (p != q) { | |
1705 phi = ensure_memory_phi(mms.alias_idx(), nophi); | |
1706 } else { | |
1707 if (p->is_Phi() && p->as_Phi()->region() == r) | |
1708 phi = p->as_Phi(); | |
1709 else | |
1710 phi = NULL; | |
1711 } | |
1712 // Insert q into local phi | |
1713 if (phi != NULL) { | |
1714 assert(phi->region() == r, ""); | |
1715 p = phi; | |
1716 phi->set_req(pnum, q); | |
1717 if (mms.at_base_memory()) { | |
1718 base = phi; // delay transforming it | |
1719 } else if (pnum == 1) { | |
1720 record_for_igvn(phi); | |
1721 p = _gvn.transform_no_reclaim(phi); | |
1722 } | |
1723 mms.set_memory(p);// store back through the iterator | |
1724 } | |
1725 } | |
1726 // Transform base last, in case we must fiddle with remerging. | |
1727 if (base != NULL && pnum == 1) { | |
1728 record_for_igvn(base); | |
1729 m->set_base_memory( _gvn.transform_no_reclaim(base) ); | |
1730 } | |
1731 } | |
1732 | |
1733 | |
1734 //------------------------ensure_phis_everywhere------------------------------- | |
1735 void Parse::ensure_phis_everywhere() { | |
1736 ensure_phi(TypeFunc::I_O); | |
1737 | |
1738 // Ensure a phi on all currently known memories. | |
1739 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { | |
1740 ensure_memory_phi(mms.alias_idx()); | |
1741 debug_only(mms.set_memory()); // keep the iterator happy | |
1742 } | |
1743 | |
1744 // Note: This is our only chance to create phis for memory slices. | |
1745 // If we miss a slice that crops up later, it will have to be | |
1746 // merged into the base-memory phi that we are building here. | |
1747 // Later, the optimizer will comb out the knot, and build separate | |
1748 // phi-loops for each memory slice that matters. | |
1749 | |
1750 // Monitors must nest nicely and not get confused amongst themselves. | |
1751 // Phi-ify everything up to the monitors, though. | |
1752 uint monoff = map()->jvms()->monoff(); | |
1753 uint nof_monitors = map()->jvms()->nof_monitors(); | |
1754 | |
1755 assert(TypeFunc::Parms == map()->jvms()->locoff(), "parser map should contain only youngest jvms"); | |
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1756 bool check_elide_phi = block()->is_SEL_head(); |
0 | 1757 for (uint i = TypeFunc::Parms; i < monoff; i++) { |
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1758 if (!check_elide_phi || !block()->can_elide_SEL_phi(i)) { |
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1759 ensure_phi(i); |
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1760 } |
0 | 1761 } |
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1762 |
0 | 1763 // Even monitors need Phis, though they are well-structured. |
1764 // This is true for OSR methods, and also for the rare cases where | |
1765 // a monitor object is the subject of a replace_in_map operation. | |
1766 // See bugs 4426707 and 5043395. | |
1767 for (uint m = 0; m < nof_monitors; m++) { | |
1768 ensure_phi(map()->jvms()->monitor_obj_offset(m)); | |
1769 } | |
1770 } | |
1771 | |
1772 | |
1773 //-----------------------------add_new_path------------------------------------ | |
1774 // Add a previously unaccounted predecessor to this block. | |
1775 int Parse::Block::add_new_path() { | |
1776 // If there is no map, return the lowest unused path number. | |
1777 if (!is_merged()) return pred_count()+1; // there will be a map shortly | |
1778 | |
1779 SafePointNode* map = start_map(); | |
1780 if (!map->control()->is_Region()) | |
1781 return pred_count()+1; // there may be a region some day | |
1782 RegionNode* r = map->control()->as_Region(); | |
1783 | |
1784 // Add new path to the region. | |
1785 uint pnum = r->req(); | |
1786 r->add_req(NULL); | |
1787 | |
1788 for (uint i = 1; i < map->req(); i++) { | |
1789 Node* n = map->in(i); | |
1790 if (i == TypeFunc::Memory) { | |
1791 // Ensure a phi on all currently known memories. | |
1792 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) { | |
1793 Node* phi = mms.memory(); | |
1794 if (phi->is_Phi() && phi->as_Phi()->region() == r) { | |
1795 assert(phi->req() == pnum, "must be same size as region"); | |
1796 phi->add_req(NULL); | |
1797 } | |
1798 } | |
1799 } else { | |
1800 if (n->is_Phi() && n->as_Phi()->region() == r) { | |
1801 assert(n->req() == pnum, "must be same size as region"); | |
1802 n->add_req(NULL); | |
1803 } | |
1804 } | |
1805 } | |
1806 | |
1807 return pnum; | |
1808 } | |
1809 | |
1810 //------------------------------ensure_phi------------------------------------- | |
1811 // Turn the idx'th entry of the current map into a Phi | |
1812 PhiNode *Parse::ensure_phi(int idx, bool nocreate) { | |
1813 SafePointNode* map = this->map(); | |
1814 Node* region = map->control(); | |
1815 assert(region->is_Region(), ""); | |
1816 | |
1817 Node* o = map->in(idx); | |
1818 assert(o != NULL, ""); | |
1819 | |
1820 if (o == top()) return NULL; // TOP always merges into TOP | |
1821 | |
1822 if (o->is_Phi() && o->as_Phi()->region() == region) { | |
1823 return o->as_Phi(); | |
1824 } | |
1825 | |
1826 // Now use a Phi here for merging | |
1827 assert(!nocreate, "Cannot build a phi for a block already parsed."); | |
1828 const JVMState* jvms = map->jvms(); | |
1829 const Type* t; | |
1830 if (jvms->is_loc(idx)) { | |
1831 t = block()->local_type_at(idx - jvms->locoff()); | |
1832 } else if (jvms->is_stk(idx)) { | |
1833 t = block()->stack_type_at(idx - jvms->stkoff()); | |
1834 } else if (jvms->is_mon(idx)) { | |
1835 assert(!jvms->is_monitor_box(idx), "no phis for boxes"); | |
1836 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object | |
1837 } else if ((uint)idx < TypeFunc::Parms) { | |
1838 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like. | |
1839 } else { | |
1840 assert(false, "no type information for this phi"); | |
1841 } | |
1842 | |
1843 // If the type falls to bottom, then this must be a local that | |
1844 // is mixing ints and oops or some such. Forcing it to top | |
1845 // makes it go dead. | |
1846 if (t == Type::BOTTOM) { | |
1847 map->set_req(idx, top()); | |
1848 return NULL; | |
1849 } | |
1850 | |
1851 // Do not create phis for top either. | |
1852 // A top on a non-null control flow must be an unused even after the.phi. | |
1853 if (t == Type::TOP || t == Type::HALF) { | |
1854 map->set_req(idx, top()); | |
1855 return NULL; | |
1856 } | |
1857 | |
1858 PhiNode* phi = PhiNode::make(region, o, t); | |
1859 gvn().set_type(phi, t); | |
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1860 if (C->do_escape_analysis()) record_for_igvn(phi); |
0 | 1861 map->set_req(idx, phi); |
1862 return phi; | |
1863 } | |
1864 | |
1865 //--------------------------ensure_memory_phi---------------------------------- | |
1866 // Turn the idx'th slice of the current memory into a Phi | |
1867 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) { | |
1868 MergeMemNode* mem = merged_memory(); | |
1869 Node* region = control(); | |
1870 assert(region->is_Region(), ""); | |
1871 | |
1872 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx); | |
1873 assert(o != NULL && o != top(), ""); | |
1874 | |
1875 PhiNode* phi; | |
1876 if (o->is_Phi() && o->as_Phi()->region() == region) { | |
1877 phi = o->as_Phi(); | |
1878 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) { | |
1879 // clone the shared base memory phi to make a new memory split | |
1880 assert(!nocreate, "Cannot build a phi for a block already parsed."); | |
1881 const Type* t = phi->bottom_type(); | |
1882 const TypePtr* adr_type = C->get_adr_type(idx); | |
1883 phi = phi->slice_memory(adr_type); | |
1884 gvn().set_type(phi, t); | |
1885 } | |
1886 return phi; | |
1887 } | |
1888 | |
1889 // Now use a Phi here for merging | |
1890 assert(!nocreate, "Cannot build a phi for a block already parsed."); | |
1891 const Type* t = o->bottom_type(); | |
1892 const TypePtr* adr_type = C->get_adr_type(idx); | |
1893 phi = PhiNode::make(region, o, t, adr_type); | |
1894 gvn().set_type(phi, t); | |
1895 if (idx == Compile::AliasIdxBot) | |
1896 mem->set_base_memory(phi); | |
1897 else | |
1898 mem->set_memory_at(idx, phi); | |
1899 return phi; | |
1900 } | |
1901 | |
1902 //------------------------------call_register_finalizer----------------------- | |
1903 // Check the klass of the receiver and call register_finalizer if the | |
1904 // class need finalization. | |
1905 void Parse::call_register_finalizer() { | |
1906 Node* receiver = local(0); | |
1907 assert(receiver != NULL && receiver->bottom_type()->isa_instptr() != NULL, | |
1908 "must have non-null instance type"); | |
1909 | |
1910 const TypeInstPtr *tinst = receiver->bottom_type()->isa_instptr(); | |
1911 if (tinst != NULL && tinst->klass()->is_loaded() && !tinst->klass_is_exact()) { | |
1912 // The type isn't known exactly so see if CHA tells us anything. | |
1913 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
1914 if (!Dependencies::has_finalizable_subclass(ik)) { | |
1915 // No finalizable subclasses so skip the dynamic check. | |
1916 C->dependencies()->assert_has_no_finalizable_subclasses(ik); | |
1917 return; | |
1918 } | |
1919 } | |
1920 | |
1921 // Insert a dynamic test for whether the instance needs | |
1922 // finalization. In general this will fold up since the concrete | |
1923 // class is often visible so the access flags are constant. | |
1924 Node* klass_addr = basic_plus_adr( receiver, receiver, oopDesc::klass_offset_in_bytes() ); | |
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1925 Node* klass = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), klass_addr, TypeInstPtr::KLASS) ); |
0 | 1926 |
1927 Node* access_flags_addr = basic_plus_adr(klass, klass, Klass::access_flags_offset_in_bytes() + sizeof(oopDesc)); | |
1928 Node* access_flags = make_load(NULL, access_flags_addr, TypeInt::INT, T_INT); | |
1929 | |
1930 Node* mask = _gvn.transform(new (C, 3) AndINode(access_flags, intcon(JVM_ACC_HAS_FINALIZER))); | |
1931 Node* check = _gvn.transform(new (C, 3) CmpINode(mask, intcon(0))); | |
1932 Node* test = _gvn.transform(new (C, 2) BoolNode(check, BoolTest::ne)); | |
1933 | |
1934 IfNode* iff = create_and_map_if(control(), test, PROB_MAX, COUNT_UNKNOWN); | |
1935 | |
1936 RegionNode* result_rgn = new (C, 3) RegionNode(3); | |
1937 record_for_igvn(result_rgn); | |
1938 | |
1939 Node *skip_register = _gvn.transform(new (C, 1) IfFalseNode(iff)); | |
1940 result_rgn->init_req(1, skip_register); | |
1941 | |
1942 Node *needs_register = _gvn.transform(new (C, 1) IfTrueNode(iff)); | |
1943 set_control(needs_register); | |
1944 if (stopped()) { | |
1945 // There is no slow path. | |
1946 result_rgn->init_req(2, top()); | |
1947 } else { | |
1948 Node *call = make_runtime_call(RC_NO_LEAF, | |
1949 OptoRuntime::register_finalizer_Type(), | |
1950 OptoRuntime::register_finalizer_Java(), | |
1951 NULL, TypePtr::BOTTOM, | |
1952 receiver); | |
1953 make_slow_call_ex(call, env()->Throwable_klass(), true); | |
1954 | |
1955 Node* fast_io = call->in(TypeFunc::I_O); | |
1956 Node* fast_mem = call->in(TypeFunc::Memory); | |
1957 // These two phis are pre-filled with copies of of the fast IO and Memory | |
1958 Node* io_phi = PhiNode::make(result_rgn, fast_io, Type::ABIO); | |
1959 Node* mem_phi = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM); | |
1960 | |
1961 result_rgn->init_req(2, control()); | |
1962 io_phi ->init_req(2, i_o()); | |
1963 mem_phi ->init_req(2, reset_memory()); | |
1964 | |
1965 set_all_memory( _gvn.transform(mem_phi) ); | |
1966 set_i_o( _gvn.transform(io_phi) ); | |
1967 } | |
1968 | |
1969 set_control( _gvn.transform(result_rgn) ); | |
1970 } | |
1971 | |
1972 //------------------------------return_current--------------------------------- | |
1973 // Append current _map to _exit_return | |
1974 void Parse::return_current(Node* value) { | |
1975 if (RegisterFinalizersAtInit && | |
1976 method()->intrinsic_id() == vmIntrinsics::_Object_init) { | |
1977 call_register_finalizer(); | |
1978 } | |
1979 | |
1980 // Do not set_parse_bci, so that return goo is credited to the return insn. | |
1981 set_bci(InvocationEntryBci); | |
1982 if (method()->is_synchronized() && GenerateSynchronizationCode) { | |
1983 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node()); | |
1984 } | |
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1985 if (C->env()->dtrace_method_probes()) { |
0 | 1986 make_dtrace_method_exit(method()); |
1987 } | |
1988 SafePointNode* exit_return = _exits.map(); | |
1989 exit_return->in( TypeFunc::Control )->add_req( control() ); | |
1990 exit_return->in( TypeFunc::I_O )->add_req( i_o () ); | |
1991 Node *mem = exit_return->in( TypeFunc::Memory ); | |
1992 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) { | |
1993 if (mms.is_empty()) { | |
1994 // get a copy of the base memory, and patch just this one input | |
1995 const TypePtr* adr_type = mms.adr_type(C); | |
1996 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); | |
1997 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); | |
1998 gvn().set_type_bottom(phi); | |
1999 phi->del_req(phi->req()-1); // prepare to re-patch | |
2000 mms.set_memory(phi); | |
2001 } | |
2002 mms.memory()->add_req(mms.memory2()); | |
2003 } | |
2004 | |
2005 // frame pointer is always same, already captured | |
2006 if (value != NULL) { | |
2007 // If returning oops to an interface-return, there is a silent free | |
2008 // cast from oop to interface allowed by the Verifier. Make it explicit | |
2009 // here. | |
2010 Node* phi = _exits.argument(0); | |
2011 const TypeInstPtr *tr = phi->bottom_type()->isa_instptr(); | |
2012 if( tr && tr->klass()->is_loaded() && | |
2013 tr->klass()->is_interface() ) { | |
2014 const TypeInstPtr *tp = value->bottom_type()->isa_instptr(); | |
2015 if (tp && tp->klass()->is_loaded() && | |
2016 !tp->klass()->is_interface()) { | |
2017 // sharpen the type eagerly; this eases certain assert checking | |
2018 if (tp->higher_equal(TypeInstPtr::NOTNULL)) | |
2019 tr = tr->join(TypeInstPtr::NOTNULL)->is_instptr(); | |
2020 value = _gvn.transform(new (C, 2) CheckCastPPNode(0,value,tr)); | |
2021 } | |
2022 } | |
2023 phi->add_req(value); | |
2024 } | |
2025 | |
2026 stop_and_kill_map(); // This CFG path dies here | |
2027 } | |
2028 | |
2029 | |
2030 //------------------------------add_safepoint---------------------------------- | |
2031 void Parse::add_safepoint() { | |
2032 // See if we can avoid this safepoint. No need for a SafePoint immediately | |
2033 // after a Call (except Leaf Call) or another SafePoint. | |
2034 Node *proj = control(); | |
2035 bool add_poll_param = SafePointNode::needs_polling_address_input(); | |
2036 uint parms = add_poll_param ? TypeFunc::Parms+1 : TypeFunc::Parms; | |
2037 if( proj->is_Proj() ) { | |
2038 Node *n0 = proj->in(0); | |
2039 if( n0->is_Catch() ) { | |
2040 n0 = n0->in(0)->in(0); | |
2041 assert( n0->is_Call(), "expect a call here" ); | |
2042 } | |
2043 if( n0->is_Call() ) { | |
2044 if( n0->as_Call()->guaranteed_safepoint() ) | |
2045 return; | |
2046 } else if( n0->is_SafePoint() && n0->req() >= parms ) { | |
2047 return; | |
2048 } | |
2049 } | |
2050 | |
2051 // Clear out dead values from the debug info. | |
2052 kill_dead_locals(); | |
2053 | |
2054 // Clone the JVM State | |
2055 SafePointNode *sfpnt = new (C, parms) SafePointNode(parms, NULL); | |
2056 | |
2057 // Capture memory state BEFORE a SafePoint. Since we can block at a | |
2058 // SafePoint we need our GC state to be safe; i.e. we need all our current | |
2059 // write barriers (card marks) to not float down after the SafePoint so we | |
2060 // must read raw memory. Likewise we need all oop stores to match the card | |
2061 // marks. If deopt can happen, we need ALL stores (we need the correct JVM | |
2062 // state on a deopt). | |
2063 | |
2064 // We do not need to WRITE the memory state after a SafePoint. The control | |
2065 // edge will keep card-marks and oop-stores from floating up from below a | |
2066 // SafePoint and our true dependency added here will keep them from floating | |
2067 // down below a SafePoint. | |
2068 | |
2069 // Clone the current memory state | |
2070 Node* mem = MergeMemNode::make(C, map()->memory()); | |
2071 | |
2072 mem = _gvn.transform(mem); | |
2073 | |
2074 // Pass control through the safepoint | |
2075 sfpnt->init_req(TypeFunc::Control , control()); | |
2076 // Fix edges normally used by a call | |
2077 sfpnt->init_req(TypeFunc::I_O , top() ); | |
2078 sfpnt->init_req(TypeFunc::Memory , mem ); | |
2079 sfpnt->init_req(TypeFunc::ReturnAdr, top() ); | |
2080 sfpnt->init_req(TypeFunc::FramePtr , top() ); | |
2081 | |
2082 // Create a node for the polling address | |
2083 if( add_poll_param ) { | |
2084 Node *polladr = ConPNode::make(C, (address)os::get_polling_page()); | |
2085 sfpnt->init_req(TypeFunc::Parms+0, _gvn.transform(polladr)); | |
2086 } | |
2087 | |
2088 // Fix up the JVM State edges | |
2089 add_safepoint_edges(sfpnt); | |
2090 Node *transformed_sfpnt = _gvn.transform(sfpnt); | |
2091 set_control(transformed_sfpnt); | |
2092 | |
2093 // Provide an edge from root to safepoint. This makes the safepoint | |
2094 // appear useful until the parse has completed. | |
2095 if( OptoRemoveUseless && transformed_sfpnt->is_SafePoint() ) { | |
2096 assert(C->root() != NULL, "Expect parse is still valid"); | |
2097 C->root()->add_prec(transformed_sfpnt); | |
2098 } | |
2099 } | |
2100 | |
1172 | 2101 //------------------------------should_add_predicate-------------------------- |
2102 bool Parse::should_add_predicate(int target_bci) { | |
2103 if (!UseLoopPredicate) return false; | |
2104 Block* target = successor_for_bci(target_bci); | |
2105 if (target != NULL && | |
2106 target->is_loop_head() && | |
2107 block()->rpo() < target->rpo()) { | |
2108 return true; | |
2109 } | |
2110 return false; | |
2111 } | |
2112 | |
2113 //------------------------------add_predicate--------------------------------- | |
2114 void Parse::add_predicate() { | |
2115 assert(UseLoopPredicate,"use only for loop predicate"); | |
2116 Node *cont = _gvn.intcon(1); | |
2117 Node* opq = _gvn.transform(new (C, 2) Opaque1Node(C, cont)); | |
2118 Node *bol = _gvn.transform(new (C, 2) Conv2BNode(opq)); | |
2119 IfNode* iff = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN); | |
2120 Node* iffalse = _gvn.transform(new (C, 1) IfFalseNode(iff)); | |
2121 C->add_predicate_opaq(opq); | |
2122 { | |
2123 PreserveJVMState pjvms(this); | |
2124 set_control(iffalse); | |
2125 uncommon_trap(Deoptimization::Reason_predicate, | |
2126 Deoptimization::Action_maybe_recompile); | |
2127 } | |
2128 Node* iftrue = _gvn.transform(new (C, 1) IfTrueNode(iff)); | |
2129 set_control(iftrue); | |
2130 } | |
2131 | |
0 | 2132 #ifndef PRODUCT |
2133 //------------------------show_parse_info-------------------------------------- | |
2134 void Parse::show_parse_info() { | |
2135 InlineTree* ilt = NULL; | |
2136 if (C->ilt() != NULL) { | |
2137 JVMState* caller_jvms = is_osr_parse() ? caller()->caller() : caller(); | |
2138 ilt = InlineTree::find_subtree_from_root(C->ilt(), caller_jvms, method()); | |
2139 } | |
2140 if (PrintCompilation && Verbose) { | |
2141 if (depth() == 1) { | |
2142 if( ilt->count_inlines() ) { | |
2143 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(), | |
2144 ilt->count_inline_bcs()); | |
2145 tty->cr(); | |
2146 } | |
2147 } else { | |
2148 if (method()->is_synchronized()) tty->print("s"); | |
2149 if (method()->has_exception_handlers()) tty->print("!"); | |
2150 // Check this is not the final compiled version | |
2151 if (C->trap_can_recompile()) { | |
2152 tty->print("-"); | |
2153 } else { | |
2154 tty->print(" "); | |
2155 } | |
2156 method()->print_short_name(); | |
2157 if (is_osr_parse()) { | |
2158 tty->print(" @ %d", osr_bci()); | |
2159 } | |
2160 tty->print(" (%d bytes)",method()->code_size()); | |
2161 if (ilt->count_inlines()) { | |
2162 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(), | |
2163 ilt->count_inline_bcs()); | |
2164 } | |
2165 tty->cr(); | |
2166 } | |
2167 } | |
2168 if (PrintOpto && (depth() == 1 || PrintOptoInlining)) { | |
2169 // Print that we succeeded; suppress this message on the first osr parse. | |
2170 | |
2171 if (method()->is_synchronized()) tty->print("s"); | |
2172 if (method()->has_exception_handlers()) tty->print("!"); | |
2173 // Check this is not the final compiled version | |
2174 if (C->trap_can_recompile() && depth() == 1) { | |
2175 tty->print("-"); | |
2176 } else { | |
2177 tty->print(" "); | |
2178 } | |
2179 if( depth() != 1 ) { tty->print(" "); } // missing compile count | |
2180 for (int i = 1; i < depth(); ++i) { tty->print(" "); } | |
2181 method()->print_short_name(); | |
2182 if (is_osr_parse()) { | |
2183 tty->print(" @ %d", osr_bci()); | |
2184 } | |
2185 if (ilt->caller_bci() != -1) { | |
2186 tty->print(" @ %d", ilt->caller_bci()); | |
2187 } | |
2188 tty->print(" (%d bytes)",method()->code_size()); | |
2189 if (ilt->count_inlines()) { | |
2190 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(), | |
2191 ilt->count_inline_bcs()); | |
2192 } | |
2193 tty->cr(); | |
2194 } | |
2195 } | |
2196 | |
2197 | |
2198 //------------------------------dump------------------------------------------- | |
2199 // Dump information associated with the bytecodes of current _method | |
2200 void Parse::dump() { | |
2201 if( method() != NULL ) { | |
2202 // Iterate over bytecodes | |
2203 ciBytecodeStream iter(method()); | |
2204 for( Bytecodes::Code bc = iter.next(); bc != ciBytecodeStream::EOBC() ; bc = iter.next() ) { | |
2205 dump_bci( iter.cur_bci() ); | |
2206 tty->cr(); | |
2207 } | |
2208 } | |
2209 } | |
2210 | |
2211 // Dump information associated with a byte code index, 'bci' | |
2212 void Parse::dump_bci(int bci) { | |
2213 // Output info on merge-points, cloning, and within _jsr..._ret | |
2214 // NYI | |
2215 tty->print(" bci:%d", bci); | |
2216 } | |
2217 | |
2218 #endif |