Mercurial > hg > graal-compiler
annotate src/share/vm/opto/stringopts.cpp @ 1751:2528b5bd749c
6980262: Memory leak when exception is thrown in static initializer
Summary: Use resource memory instead of c-heap for the exception message
Reviewed-by: phh, jmasa
author | kamg |
---|---|
date | Fri, 27 Aug 2010 15:05:28 -0400 |
parents | c18cbe5936b8 |
children | 3e8fbc61cee8 |
rev | line source |
---|---|
1080 | 1 /* |
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2 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. |
1080 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
1080 | 22 * |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_stringopts.cpp.incl" | |
27 | |
28 #define __ kit. | |
29 | |
30 class StringConcat : public ResourceObj { | |
31 private: | |
32 PhaseStringOpts* _stringopts; | |
33 Node* _string_alloc; | |
34 AllocateNode* _begin; // The allocation the begins the pattern | |
35 CallStaticJavaNode* _end; // The final call of the pattern. Will either be | |
36 // SB.toString or or String.<init>(SB.toString) | |
37 bool _multiple; // indicates this is a fusion of two or more | |
38 // separate StringBuilders | |
39 | |
40 Node* _arguments; // The list of arguments to be concatenated | |
41 GrowableArray<int> _mode; // into a String along with a mode flag | |
42 // indicating how to treat the value. | |
43 | |
44 Node_List _control; // List of control nodes that will be deleted | |
45 Node_List _uncommon_traps; // Uncommon traps that needs to be rewritten | |
46 // to restart at the initial JVMState. | |
47 public: | |
48 // Mode for converting arguments to Strings | |
49 enum { | |
50 StringMode, | |
51 IntMode, | |
52 CharMode | |
53 }; | |
54 | |
55 StringConcat(PhaseStringOpts* stringopts, CallStaticJavaNode* end): | |
56 _end(end), | |
57 _begin(NULL), | |
58 _multiple(false), | |
59 _string_alloc(NULL), | |
60 _stringopts(stringopts) { | |
61 _arguments = new (_stringopts->C, 1) Node(1); | |
62 _arguments->del_req(0); | |
63 } | |
64 | |
65 bool validate_control_flow(); | |
66 | |
67 void merge_add() { | |
68 #if 0 | |
69 // XXX This is place holder code for reusing an existing String | |
70 // allocation but the logic for checking the state safety is | |
71 // probably inadequate at the moment. | |
72 CallProjections endprojs; | |
73 sc->end()->extract_projections(&endprojs, false); | |
74 if (endprojs.resproj != NULL) { | |
75 for (SimpleDUIterator i(endprojs.resproj); i.has_next(); i.next()) { | |
76 CallStaticJavaNode *use = i.get()->isa_CallStaticJava(); | |
77 if (use != NULL && use->method() != NULL && | |
78 use->method()->holder() == C->env()->String_klass() && | |
79 use->method()->name() == ciSymbol::object_initializer_name() && | |
80 use->in(TypeFunc::Parms + 1) == endprojs.resproj) { | |
81 // Found useless new String(sb.toString()) so reuse the newly allocated String | |
82 // when creating the result instead of allocating a new one. | |
83 sc->set_string_alloc(use->in(TypeFunc::Parms)); | |
84 sc->set_end(use); | |
85 } | |
86 } | |
87 } | |
88 #endif | |
89 } | |
90 | |
91 StringConcat* merge(StringConcat* other, Node* arg); | |
92 | |
93 void set_allocation(AllocateNode* alloc) { | |
94 _begin = alloc; | |
95 } | |
96 | |
97 void append(Node* value, int mode) { | |
98 _arguments->add_req(value); | |
99 _mode.append(mode); | |
100 } | |
101 void push(Node* value, int mode) { | |
102 _arguments->ins_req(0, value); | |
103 _mode.insert_before(0, mode); | |
104 } | |
105 void push_string(Node* value) { | |
106 push(value, StringMode); | |
107 } | |
108 void push_int(Node* value) { | |
109 push(value, IntMode); | |
110 } | |
111 void push_char(Node* value) { | |
112 push(value, CharMode); | |
113 } | |
114 | |
115 Node* argument(int i) { | |
116 return _arguments->in(i); | |
117 } | |
118 void set_argument(int i, Node* value) { | |
119 _arguments->set_req(i, value); | |
120 } | |
121 int num_arguments() { | |
122 return _mode.length(); | |
123 } | |
124 int mode(int i) { | |
125 return _mode.at(i); | |
126 } | |
127 void add_control(Node* ctrl) { | |
128 assert(!_control.contains(ctrl), "only push once"); | |
129 _control.push(ctrl); | |
130 } | |
131 CallStaticJavaNode* end() { return _end; } | |
132 AllocateNode* begin() { return _begin; } | |
133 Node* string_alloc() { return _string_alloc; } | |
134 | |
135 void eliminate_unneeded_control(); | |
136 void eliminate_initialize(InitializeNode* init); | |
137 void eliminate_call(CallNode* call); | |
138 | |
139 void maybe_log_transform() { | |
140 CompileLog* log = _stringopts->C->log(); | |
141 if (log != NULL) { | |
142 log->head("replace_string_concat arguments='%d' string_alloc='%d' multiple='%d'", | |
143 num_arguments(), | |
144 _string_alloc != NULL, | |
145 _multiple); | |
146 JVMState* p = _begin->jvms(); | |
147 while (p != NULL) { | |
148 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); | |
149 p = p->caller(); | |
150 } | |
151 log->tail("replace_string_concat"); | |
152 } | |
153 } | |
154 | |
155 void convert_uncommon_traps(GraphKit& kit, const JVMState* jvms) { | |
156 for (uint u = 0; u < _uncommon_traps.size(); u++) { | |
157 Node* uct = _uncommon_traps.at(u); | |
158 | |
159 // Build a new call using the jvms state of the allocate | |
160 address call_addr = SharedRuntime::uncommon_trap_blob()->instructions_begin(); | |
161 const TypeFunc* call_type = OptoRuntime::uncommon_trap_Type(); | |
162 int size = call_type->domain()->cnt(); | |
163 const TypePtr* no_memory_effects = NULL; | |
164 Compile* C = _stringopts->C; | |
165 CallStaticJavaNode* call = new (C, size) CallStaticJavaNode(call_type, call_addr, "uncommon_trap", | |
166 jvms->bci(), no_memory_effects); | |
167 for (int e = 0; e < TypeFunc::Parms; e++) { | |
168 call->init_req(e, uct->in(e)); | |
169 } | |
170 // Set the trap request to record intrinsic failure if this trap | |
171 // is taken too many times. Ideally we would handle then traps by | |
172 // doing the original bookkeeping in the MDO so that if it caused | |
173 // the code to be thrown out we could still recompile and use the | |
174 // optimization. Failing the uncommon traps doesn't really mean | |
175 // that the optimization is a bad idea but there's no other way to | |
176 // do the MDO updates currently. | |
177 int trap_request = Deoptimization::make_trap_request(Deoptimization::Reason_intrinsic, | |
178 Deoptimization::Action_make_not_entrant); | |
179 call->init_req(TypeFunc::Parms, __ intcon(trap_request)); | |
180 kit.add_safepoint_edges(call); | |
181 | |
182 _stringopts->gvn()->transform(call); | |
183 C->gvn_replace_by(uct, call); | |
184 uct->disconnect_inputs(NULL); | |
185 } | |
186 } | |
187 | |
188 void cleanup() { | |
189 // disconnect the hook node | |
190 _arguments->disconnect_inputs(NULL); | |
191 } | |
192 }; | |
193 | |
194 | |
195 void StringConcat::eliminate_unneeded_control() { | |
196 eliminate_initialize(begin()->initialization()); | |
197 for (uint i = 0; i < _control.size(); i++) { | |
198 Node* n = _control.at(i); | |
199 if (n->is_Call()) { | |
200 if (n != _end) { | |
201 eliminate_call(n->as_Call()); | |
202 } | |
203 } else if (n->is_IfTrue()) { | |
204 Compile* C = _stringopts->C; | |
205 C->gvn_replace_by(n, n->in(0)->in(0)); | |
206 C->gvn_replace_by(n->in(0), C->top()); | |
207 } | |
208 } | |
209 } | |
210 | |
211 | |
212 StringConcat* StringConcat::merge(StringConcat* other, Node* arg) { | |
213 StringConcat* result = new StringConcat(_stringopts, _end); | |
214 for (uint x = 0; x < _control.size(); x++) { | |
215 Node* n = _control.at(x); | |
216 if (n->is_Call()) { | |
217 result->_control.push(n); | |
218 } | |
219 } | |
220 for (uint x = 0; x < other->_control.size(); x++) { | |
221 Node* n = other->_control.at(x); | |
222 if (n->is_Call()) { | |
223 result->_control.push(n); | |
224 } | |
225 } | |
226 assert(result->_control.contains(other->_end), "what?"); | |
227 assert(result->_control.contains(_begin), "what?"); | |
228 for (int x = 0; x < num_arguments(); x++) { | |
229 if (argument(x) == arg) { | |
230 // replace the toString result with the all the arguments that | |
231 // made up the other StringConcat | |
232 for (int y = 0; y < other->num_arguments(); y++) { | |
233 result->append(other->argument(y), other->mode(y)); | |
234 } | |
235 } else { | |
236 result->append(argument(x), mode(x)); | |
237 } | |
238 } | |
239 result->set_allocation(other->_begin); | |
240 result->_multiple = true; | |
241 return result; | |
242 } | |
243 | |
244 | |
245 void StringConcat::eliminate_call(CallNode* call) { | |
246 Compile* C = _stringopts->C; | |
247 CallProjections projs; | |
248 call->extract_projections(&projs, false); | |
249 if (projs.fallthrough_catchproj != NULL) { | |
250 C->gvn_replace_by(projs.fallthrough_catchproj, call->in(TypeFunc::Control)); | |
251 } | |
252 if (projs.fallthrough_memproj != NULL) { | |
253 C->gvn_replace_by(projs.fallthrough_memproj, call->in(TypeFunc::Memory)); | |
254 } | |
255 if (projs.catchall_memproj != NULL) { | |
256 C->gvn_replace_by(projs.catchall_memproj, C->top()); | |
257 } | |
258 if (projs.fallthrough_ioproj != NULL) { | |
259 C->gvn_replace_by(projs.fallthrough_ioproj, call->in(TypeFunc::I_O)); | |
260 } | |
261 if (projs.catchall_ioproj != NULL) { | |
262 C->gvn_replace_by(projs.catchall_ioproj, C->top()); | |
263 } | |
264 if (projs.catchall_catchproj != NULL) { | |
265 // EA can't cope with the partially collapsed graph this | |
266 // creates so put it on the worklist to be collapsed later. | |
267 for (SimpleDUIterator i(projs.catchall_catchproj); i.has_next(); i.next()) { | |
268 Node *use = i.get(); | |
269 int opc = use->Opcode(); | |
270 if (opc == Op_CreateEx || opc == Op_Region) { | |
271 _stringopts->record_dead_node(use); | |
272 } | |
273 } | |
274 C->gvn_replace_by(projs.catchall_catchproj, C->top()); | |
275 } | |
276 if (projs.resproj != NULL) { | |
277 C->gvn_replace_by(projs.resproj, C->top()); | |
278 } | |
279 C->gvn_replace_by(call, C->top()); | |
280 } | |
281 | |
282 void StringConcat::eliminate_initialize(InitializeNode* init) { | |
283 Compile* C = _stringopts->C; | |
284 | |
285 // Eliminate Initialize node. | |
286 assert(init->outcnt() <= 2, "only a control and memory projection expected"); | |
287 assert(init->req() <= InitializeNode::RawStores, "no pending inits"); | |
288 Node *ctrl_proj = init->proj_out(TypeFunc::Control); | |
289 if (ctrl_proj != NULL) { | |
290 C->gvn_replace_by(ctrl_proj, init->in(TypeFunc::Control)); | |
291 } | |
292 Node *mem_proj = init->proj_out(TypeFunc::Memory); | |
293 if (mem_proj != NULL) { | |
294 Node *mem = init->in(TypeFunc::Memory); | |
295 C->gvn_replace_by(mem_proj, mem); | |
296 } | |
297 C->gvn_replace_by(init, C->top()); | |
298 init->disconnect_inputs(NULL); | |
299 } | |
300 | |
301 Node_List PhaseStringOpts::collect_toString_calls() { | |
302 Node_List string_calls; | |
303 Node_List worklist; | |
304 | |
305 _visited.Clear(); | |
306 | |
307 // Prime the worklist | |
308 for (uint i = 1; i < C->root()->len(); i++) { | |
309 Node* n = C->root()->in(i); | |
310 if (n != NULL && !_visited.test_set(n->_idx)) { | |
311 worklist.push(n); | |
312 } | |
313 } | |
314 | |
315 while (worklist.size() > 0) { | |
316 Node* ctrl = worklist.pop(); | |
317 if (ctrl->is_CallStaticJava()) { | |
318 CallStaticJavaNode* csj = ctrl->as_CallStaticJava(); | |
319 ciMethod* m = csj->method(); | |
320 if (m != NULL && | |
321 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || | |
322 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) { | |
323 string_calls.push(csj); | |
324 } | |
325 } | |
326 if (ctrl->in(0) != NULL && !_visited.test_set(ctrl->in(0)->_idx)) { | |
327 worklist.push(ctrl->in(0)); | |
328 } | |
329 if (ctrl->is_Region()) { | |
330 for (uint i = 1; i < ctrl->len(); i++) { | |
331 if (ctrl->in(i) != NULL && !_visited.test_set(ctrl->in(i)->_idx)) { | |
332 worklist.push(ctrl->in(i)); | |
333 } | |
334 } | |
335 } | |
336 } | |
337 return string_calls; | |
338 } | |
339 | |
340 | |
341 StringConcat* PhaseStringOpts::build_candidate(CallStaticJavaNode* call) { | |
342 ciMethod* m = call->method(); | |
343 ciSymbol* string_sig; | |
344 ciSymbol* int_sig; | |
345 ciSymbol* char_sig; | |
346 if (m->holder() == C->env()->StringBuilder_klass()) { | |
347 string_sig = ciSymbol::String_StringBuilder_signature(); | |
348 int_sig = ciSymbol::int_StringBuilder_signature(); | |
349 char_sig = ciSymbol::char_StringBuilder_signature(); | |
350 } else if (m->holder() == C->env()->StringBuffer_klass()) { | |
351 string_sig = ciSymbol::String_StringBuffer_signature(); | |
352 int_sig = ciSymbol::int_StringBuffer_signature(); | |
353 char_sig = ciSymbol::char_StringBuffer_signature(); | |
354 } else { | |
355 return NULL; | |
356 } | |
357 #ifndef PRODUCT | |
358 if (PrintOptimizeStringConcat) { | |
359 tty->print("considering toString call in "); | |
360 call->jvms()->dump_spec(tty); tty->cr(); | |
361 } | |
362 #endif | |
363 | |
364 StringConcat* sc = new StringConcat(this, call); | |
365 | |
366 AllocateNode* alloc = NULL; | |
367 InitializeNode* init = NULL; | |
368 | |
369 // possible opportunity for StringBuilder fusion | |
370 CallStaticJavaNode* cnode = call; | |
371 while (cnode) { | |
372 Node* recv = cnode->in(TypeFunc::Parms)->uncast(); | |
373 if (recv->is_Proj()) { | |
374 recv = recv->in(0); | |
375 } | |
376 cnode = recv->isa_CallStaticJava(); | |
377 if (cnode == NULL) { | |
378 alloc = recv->isa_Allocate(); | |
379 if (alloc == NULL) { | |
380 break; | |
381 } | |
382 // Find the constructor call | |
383 Node* result = alloc->result_cast(); | |
384 if (result == NULL || !result->is_CheckCastPP()) { | |
385 // strange looking allocation | |
386 #ifndef PRODUCT | |
387 if (PrintOptimizeStringConcat) { | |
388 tty->print("giving up because allocation looks strange "); | |
389 alloc->jvms()->dump_spec(tty); tty->cr(); | |
390 } | |
391 #endif | |
392 break; | |
393 } | |
394 Node* constructor = NULL; | |
395 for (SimpleDUIterator i(result); i.has_next(); i.next()) { | |
396 CallStaticJavaNode *use = i.get()->isa_CallStaticJava(); | |
397 if (use != NULL && use->method() != NULL && | |
398 use->method()->name() == ciSymbol::object_initializer_name() && | |
399 use->method()->holder() == m->holder()) { | |
400 // Matched the constructor. | |
401 ciSymbol* sig = use->method()->signature()->as_symbol(); | |
402 if (sig == ciSymbol::void_method_signature() || | |
403 sig == ciSymbol::int_void_signature() || | |
404 sig == ciSymbol::string_void_signature()) { | |
405 if (sig == ciSymbol::string_void_signature()) { | |
406 // StringBuilder(String) so pick this up as the first argument | |
407 assert(use->in(TypeFunc::Parms + 1) != NULL, "what?"); | |
408 sc->push_string(use->in(TypeFunc::Parms + 1)); | |
409 } | |
410 // The int variant takes an initial size for the backing | |
411 // array so just treat it like the void version. | |
412 constructor = use; | |
413 } else { | |
414 #ifndef PRODUCT | |
415 if (PrintOptimizeStringConcat) { | |
416 tty->print("unexpected constructor signature: %s", sig->as_utf8()); | |
417 } | |
418 #endif | |
419 } | |
420 break; | |
421 } | |
422 } | |
423 if (constructor == NULL) { | |
424 // couldn't find constructor | |
425 #ifndef PRODUCT | |
426 if (PrintOptimizeStringConcat) { | |
427 tty->print("giving up because couldn't find constructor "); | |
428 alloc->jvms()->dump_spec(tty); | |
429 } | |
430 #endif | |
431 break; | |
432 } | |
433 | |
434 // Walked all the way back and found the constructor call so see | |
435 // if this call converted into a direct string concatenation. | |
436 sc->add_control(call); | |
437 sc->add_control(constructor); | |
438 sc->add_control(alloc); | |
439 sc->set_allocation(alloc); | |
440 if (sc->validate_control_flow()) { | |
441 return sc; | |
442 } else { | |
443 return NULL; | |
444 } | |
445 } else if (cnode->method() == NULL) { | |
446 break; | |
447 } else if (cnode->method()->holder() == m->holder() && | |
448 cnode->method()->name() == ciSymbol::append_name() && | |
449 (cnode->method()->signature()->as_symbol() == string_sig || | |
450 cnode->method()->signature()->as_symbol() == char_sig || | |
451 cnode->method()->signature()->as_symbol() == int_sig)) { | |
452 sc->add_control(cnode); | |
453 Node* arg = cnode->in(TypeFunc::Parms + 1); | |
454 if (cnode->method()->signature()->as_symbol() == int_sig) { | |
455 sc->push_int(arg); | |
456 } else if (cnode->method()->signature()->as_symbol() == char_sig) { | |
457 sc->push_char(arg); | |
458 } else { | |
459 if (arg->is_Proj() && arg->in(0)->is_CallStaticJava()) { | |
460 CallStaticJavaNode* csj = arg->in(0)->as_CallStaticJava(); | |
461 if (csj->method() != NULL && | |
462 csj->method()->holder() == C->env()->Integer_klass() && | |
463 csj->method()->name() == ciSymbol::toString_name()) { | |
464 sc->add_control(csj); | |
465 sc->push_int(csj->in(TypeFunc::Parms)); | |
466 continue; | |
467 } | |
468 } | |
469 sc->push_string(arg); | |
470 } | |
471 continue; | |
472 } else { | |
473 // some unhandled signature | |
474 #ifndef PRODUCT | |
475 if (PrintOptimizeStringConcat) { | |
476 tty->print("giving up because encountered unexpected signature "); | |
477 cnode->tf()->dump(); tty->cr(); | |
478 cnode->in(TypeFunc::Parms + 1)->dump(); | |
479 } | |
480 #endif | |
481 break; | |
482 } | |
483 } | |
484 return NULL; | |
485 } | |
486 | |
487 | |
488 PhaseStringOpts::PhaseStringOpts(PhaseGVN* gvn, Unique_Node_List*): | |
489 Phase(StringOpts), | |
490 _gvn(gvn), | |
491 _visited(Thread::current()->resource_area()) { | |
492 | |
493 assert(OptimizeStringConcat, "shouldn't be here"); | |
494 | |
495 size_table_field = C->env()->Integer_klass()->get_field_by_name(ciSymbol::make("sizeTable"), | |
496 ciSymbol::make("[I"), true); | |
497 if (size_table_field == NULL) { | |
498 // Something wrong so give up. | |
499 assert(false, "why can't we find Integer.sizeTable?"); | |
500 return; | |
501 } | |
502 | |
503 // Collect the types needed to talk about the various slices of memory | |
504 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
505 false, NULL, 0); | |
506 | |
507 const TypePtr* value_field_type = string_type->add_offset(java_lang_String::value_offset_in_bytes()); | |
508 const TypePtr* offset_field_type = string_type->add_offset(java_lang_String::offset_offset_in_bytes()); | |
509 const TypePtr* count_field_type = string_type->add_offset(java_lang_String::count_offset_in_bytes()); | |
510 | |
511 value_field_idx = C->get_alias_index(value_field_type); | |
512 count_field_idx = C->get_alias_index(count_field_type); | |
513 offset_field_idx = C->get_alias_index(offset_field_type); | |
514 char_adr_idx = C->get_alias_index(TypeAryPtr::CHARS); | |
515 | |
516 // For each locally allocated StringBuffer see if the usages can be | |
517 // collapsed into a single String construction. | |
518 | |
519 // Run through the list of allocation looking for SB.toString to see | |
520 // if it's possible to fuse the usage of the SB into a single String | |
521 // construction. | |
522 GrowableArray<StringConcat*> concats; | |
523 Node_List toStrings = collect_toString_calls(); | |
524 while (toStrings.size() > 0) { | |
525 StringConcat* sc = build_candidate(toStrings.pop()->as_CallStaticJava()); | |
526 if (sc != NULL) { | |
527 concats.push(sc); | |
528 } | |
529 } | |
530 | |
531 // try to coalesce separate concats | |
532 restart: | |
533 for (int c = 0; c < concats.length(); c++) { | |
534 StringConcat* sc = concats.at(c); | |
535 for (int i = 0; i < sc->num_arguments(); i++) { | |
536 Node* arg = sc->argument(i); | |
537 if (arg->is_Proj() && arg->in(0)->is_CallStaticJava()) { | |
538 CallStaticJavaNode* csj = arg->in(0)->as_CallStaticJava(); | |
539 if (csj->method() != NULL && | |
540 (csj->method()->holder() == C->env()->StringBuffer_klass() || | |
541 csj->method()->holder() == C->env()->StringBuilder_klass()) && | |
542 csj->method()->name() == ciSymbol::toString_name()) { | |
543 for (int o = 0; o < concats.length(); o++) { | |
544 if (c == o) continue; | |
545 StringConcat* other = concats.at(o); | |
546 if (other->end() == csj) { | |
547 #ifndef PRODUCT | |
548 if (PrintOptimizeStringConcat) { | |
549 tty->print_cr("considering stacked concats"); | |
550 } | |
551 #endif | |
552 | |
553 StringConcat* merged = sc->merge(other, arg); | |
554 if (merged->validate_control_flow()) { | |
555 #ifndef PRODUCT | |
556 if (PrintOptimizeStringConcat) { | |
557 tty->print_cr("stacking would succeed"); | |
558 } | |
559 #endif | |
560 if (c < o) { | |
561 concats.remove_at(o); | |
562 concats.at_put(c, merged); | |
563 } else { | |
564 concats.remove_at(c); | |
565 concats.at_put(o, merged); | |
566 } | |
567 goto restart; | |
568 } else { | |
569 #ifndef PRODUCT | |
570 if (PrintOptimizeStringConcat) { | |
571 tty->print_cr("stacking would fail"); | |
572 } | |
573 #endif | |
574 } | |
575 } | |
576 } | |
577 } | |
578 } | |
579 } | |
580 } | |
581 | |
582 | |
583 for (int c = 0; c < concats.length(); c++) { | |
584 StringConcat* sc = concats.at(c); | |
585 replace_string_concat(sc); | |
586 } | |
587 | |
588 remove_dead_nodes(); | |
589 } | |
590 | |
591 void PhaseStringOpts::record_dead_node(Node* dead) { | |
592 dead_worklist.push(dead); | |
593 } | |
594 | |
595 void PhaseStringOpts::remove_dead_nodes() { | |
596 // Delete any dead nodes to make things clean enough that escape | |
597 // analysis doesn't get unhappy. | |
598 while (dead_worklist.size() > 0) { | |
599 Node* use = dead_worklist.pop(); | |
600 int opc = use->Opcode(); | |
601 switch (opc) { | |
602 case Op_Region: { | |
603 uint i = 1; | |
604 for (i = 1; i < use->req(); i++) { | |
605 if (use->in(i) != C->top()) { | |
606 break; | |
607 } | |
608 } | |
609 if (i >= use->req()) { | |
610 for (SimpleDUIterator i(use); i.has_next(); i.next()) { | |
611 Node* m = i.get(); | |
612 if (m->is_Phi()) { | |
613 dead_worklist.push(m); | |
614 } | |
615 } | |
616 C->gvn_replace_by(use, C->top()); | |
617 } | |
618 break; | |
619 } | |
620 case Op_AddP: | |
621 case Op_CreateEx: { | |
622 // Recurisvely clean up references to CreateEx so EA doesn't | |
623 // get unhappy about the partially collapsed graph. | |
624 for (SimpleDUIterator i(use); i.has_next(); i.next()) { | |
625 Node* m = i.get(); | |
626 if (m->is_AddP()) { | |
627 dead_worklist.push(m); | |
628 } | |
629 } | |
630 C->gvn_replace_by(use, C->top()); | |
631 break; | |
632 } | |
633 case Op_Phi: | |
634 if (use->in(0) == C->top()) { | |
635 C->gvn_replace_by(use, C->top()); | |
636 } | |
637 break; | |
638 } | |
639 } | |
640 } | |
641 | |
642 | |
643 bool StringConcat::validate_control_flow() { | |
644 // We found all the calls and arguments now lets see if it's | |
645 // safe to transform the graph as we would expect. | |
646 | |
647 // Check to see if this resulted in too many uncommon traps previously | |
648 if (Compile::current()->too_many_traps(_begin->jvms()->method(), _begin->jvms()->bci(), | |
649 Deoptimization::Reason_intrinsic)) { | |
650 return false; | |
651 } | |
652 | |
653 // Walk backwards over the control flow from toString to the | |
654 // allocation and make sure all the control flow is ok. This | |
655 // means it's either going to be eliminated once the calls are | |
656 // removed or it can safely be transformed into an uncommon | |
657 // trap. | |
658 | |
659 int null_check_count = 0; | |
660 Unique_Node_List ctrl_path; | |
661 | |
662 assert(_control.contains(_begin), "missing"); | |
663 assert(_control.contains(_end), "missing"); | |
664 | |
665 // Collect the nodes that we know about and will eliminate into ctrl_path | |
666 for (uint i = 0; i < _control.size(); i++) { | |
667 // Push the call and it's control projection | |
668 Node* n = _control.at(i); | |
669 if (n->is_Allocate()) { | |
670 AllocateNode* an = n->as_Allocate(); | |
671 InitializeNode* init = an->initialization(); | |
672 ctrl_path.push(init); | |
673 ctrl_path.push(init->as_Multi()->proj_out(0)); | |
674 } | |
675 if (n->is_Call()) { | |
676 CallNode* cn = n->as_Call(); | |
677 ctrl_path.push(cn); | |
678 ctrl_path.push(cn->proj_out(0)); | |
679 ctrl_path.push(cn->proj_out(0)->unique_out()); | |
680 ctrl_path.push(cn->proj_out(0)->unique_out()->as_Catch()->proj_out(0)); | |
681 } else { | |
682 ShouldNotReachHere(); | |
683 } | |
684 } | |
685 | |
686 // Skip backwards through the control checking for unexpected contro flow | |
687 Node* ptr = _end; | |
688 bool fail = false; | |
689 while (ptr != _begin) { | |
690 if (ptr->is_Call() && ctrl_path.member(ptr)) { | |
691 ptr = ptr->in(0); | |
692 } else if (ptr->is_CatchProj() && ctrl_path.member(ptr)) { | |
693 ptr = ptr->in(0)->in(0)->in(0); | |
694 assert(ctrl_path.member(ptr), "should be a known piece of control"); | |
695 } else if (ptr->is_IfTrue()) { | |
696 IfNode* iff = ptr->in(0)->as_If(); | |
697 BoolNode* b = iff->in(1)->isa_Bool(); | |
698 Node* cmp = b->in(1); | |
699 Node* v1 = cmp->in(1); | |
700 Node* v2 = cmp->in(2); | |
701 Node* otherproj = iff->proj_out(1 - ptr->as_Proj()->_con); | |
702 | |
703 // Null check of the return of append which can simply be eliminated | |
704 if (b->_test._test == BoolTest::ne && | |
705 v2->bottom_type() == TypePtr::NULL_PTR && | |
706 v1->is_Proj() && ctrl_path.member(v1->in(0))) { | |
707 // NULL check of the return value of the append | |
708 null_check_count++; | |
709 if (otherproj->outcnt() == 1) { | |
710 CallStaticJavaNode* call = otherproj->unique_out()->isa_CallStaticJava(); | |
711 if (call != NULL && call->_name != NULL && strcmp(call->_name, "uncommon_trap") == 0) { | |
712 ctrl_path.push(call); | |
713 } | |
714 } | |
715 _control.push(ptr); | |
716 ptr = ptr->in(0)->in(0); | |
717 continue; | |
718 } | |
719 | |
720 // A test which leads to an uncommon trap which should be safe. | |
721 // Later this trap will be converted into a trap that restarts | |
722 // at the beginning. | |
723 if (otherproj->outcnt() == 1) { | |
724 CallStaticJavaNode* call = otherproj->unique_out()->isa_CallStaticJava(); | |
725 if (call != NULL && call->_name != NULL && strcmp(call->_name, "uncommon_trap") == 0) { | |
726 // control flow leads to uct so should be ok | |
727 _uncommon_traps.push(call); | |
728 ctrl_path.push(call); | |
729 ptr = ptr->in(0)->in(0); | |
730 continue; | |
731 } | |
732 } | |
733 | |
734 #ifndef PRODUCT | |
735 // Some unexpected control flow we don't know how to handle. | |
736 if (PrintOptimizeStringConcat) { | |
737 tty->print_cr("failing with unknown test"); | |
738 b->dump(); | |
739 cmp->dump(); | |
740 v1->dump(); | |
741 v2->dump(); | |
742 tty->cr(); | |
743 } | |
744 #endif | |
745 break; | |
746 } else if (ptr->is_Proj() && ptr->in(0)->is_Initialize()) { | |
747 ptr = ptr->in(0)->in(0); | |
748 } else if (ptr->is_Region()) { | |
749 Node* copy = ptr->as_Region()->is_copy(); | |
750 if (copy != NULL) { | |
751 ptr = copy; | |
752 continue; | |
753 } | |
754 if (ptr->req() == 3 && | |
755 ptr->in(1) != NULL && ptr->in(1)->is_Proj() && | |
756 ptr->in(2) != NULL && ptr->in(2)->is_Proj() && | |
757 ptr->in(1)->in(0) == ptr->in(2)->in(0) && | |
758 ptr->in(1)->in(0) != NULL && ptr->in(1)->in(0)->is_If()) { | |
759 // Simple diamond. | |
760 // XXX should check for possibly merging stores. simple data merges are ok. | |
761 ptr = ptr->in(1)->in(0)->in(0); | |
762 continue; | |
763 } | |
764 #ifndef PRODUCT | |
765 if (PrintOptimizeStringConcat) { | |
766 tty->print_cr("fusion would fail for region"); | |
767 _begin->dump(); | |
768 ptr->dump(2); | |
769 } | |
770 #endif | |
771 fail = true; | |
772 break; | |
773 } else { | |
774 // other unknown control | |
775 if (!fail) { | |
776 #ifndef PRODUCT | |
777 if (PrintOptimizeStringConcat) { | |
778 tty->print_cr("fusion would fail for"); | |
779 _begin->dump(); | |
780 } | |
781 #endif | |
782 fail = true; | |
783 } | |
784 #ifndef PRODUCT | |
785 if (PrintOptimizeStringConcat) { | |
786 ptr->dump(); | |
787 } | |
788 #endif | |
789 ptr = ptr->in(0); | |
790 } | |
791 } | |
792 #ifndef PRODUCT | |
793 if (PrintOptimizeStringConcat && fail) { | |
794 tty->cr(); | |
795 } | |
796 #endif | |
797 if (fail) return !fail; | |
798 | |
799 // Validate that all these results produced are contained within | |
800 // this cluster of objects. First collect all the results produced | |
801 // by calls in the region. | |
802 _stringopts->_visited.Clear(); | |
803 Node_List worklist; | |
804 Node* final_result = _end->proj_out(TypeFunc::Parms); | |
805 for (uint i = 0; i < _control.size(); i++) { | |
806 CallNode* cnode = _control.at(i)->isa_Call(); | |
807 if (cnode != NULL) { | |
808 _stringopts->_visited.test_set(cnode->_idx); | |
809 } | |
810 Node* result = cnode != NULL ? cnode->proj_out(TypeFunc::Parms) : NULL; | |
811 if (result != NULL && result != final_result) { | |
812 worklist.push(result); | |
813 } | |
814 } | |
815 | |
816 Node* last_result = NULL; | |
817 while (worklist.size() > 0) { | |
818 Node* result = worklist.pop(); | |
819 if (_stringopts->_visited.test_set(result->_idx)) | |
820 continue; | |
821 for (SimpleDUIterator i(result); i.has_next(); i.next()) { | |
822 Node *use = i.get(); | |
823 if (ctrl_path.member(use)) { | |
824 // already checked this | |
825 continue; | |
826 } | |
827 int opc = use->Opcode(); | |
828 if (opc == Op_CmpP || opc == Op_Node) { | |
829 ctrl_path.push(use); | |
830 continue; | |
831 } | |
832 if (opc == Op_CastPP || opc == Op_CheckCastPP) { | |
833 for (SimpleDUIterator j(use); j.has_next(); j.next()) { | |
834 worklist.push(j.get()); | |
835 } | |
836 worklist.push(use->in(1)); | |
837 ctrl_path.push(use); | |
838 continue; | |
839 } | |
840 #ifndef PRODUCT | |
841 if (PrintOptimizeStringConcat) { | |
842 if (result != last_result) { | |
843 last_result = result; | |
844 tty->print_cr("extra uses for result:"); | |
845 last_result->dump(); | |
846 } | |
847 use->dump(); | |
848 } | |
849 #endif | |
850 fail = true; | |
851 break; | |
852 } | |
853 } | |
854 | |
855 #ifndef PRODUCT | |
856 if (PrintOptimizeStringConcat && !fail) { | |
857 ttyLocker ttyl; | |
858 tty->cr(); | |
859 tty->print("fusion would succeed (%d %d) for ", null_check_count, _uncommon_traps.size()); | |
860 _begin->jvms()->dump_spec(tty); tty->cr(); | |
861 for (int i = 0; i < num_arguments(); i++) { | |
862 argument(i)->dump(); | |
863 } | |
864 _control.dump(); | |
865 tty->cr(); | |
866 } | |
867 #endif | |
868 | |
869 return !fail; | |
870 } | |
871 | |
872 Node* PhaseStringOpts::fetch_static_field(GraphKit& kit, ciField* field) { | |
873 const TypeKlassPtr* klass_type = TypeKlassPtr::make(field->holder()); | |
874 Node* klass_node = __ makecon(klass_type); | |
875 BasicType bt = field->layout_type(); | |
876 ciType* field_klass = field->type(); | |
877 | |
878 const Type *type; | |
879 if( bt == T_OBJECT ) { | |
880 if (!field->type()->is_loaded()) { | |
881 type = TypeInstPtr::BOTTOM; | |
882 } else if (field->is_constant()) { | |
883 // This can happen if the constant oop is non-perm. | |
884 ciObject* con = field->constant_value().as_object(); | |
885 // Do not "join" in the previous type; it doesn't add value, | |
886 // and may yield a vacuous result if the field is of interface type. | |
887 type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); | |
888 assert(type != NULL, "field singleton type must be consistent"); | |
889 } else { | |
890 type = TypeOopPtr::make_from_klass(field_klass->as_klass()); | |
891 } | |
892 } else { | |
893 type = Type::get_const_basic_type(bt); | |
894 } | |
895 | |
896 return kit.make_load(NULL, kit.basic_plus_adr(klass_node, field->offset_in_bytes()), | |
897 type, T_OBJECT, | |
898 C->get_alias_index(klass_type->add_offset(field->offset_in_bytes()))); | |
899 } | |
900 | |
901 Node* PhaseStringOpts::int_stringSize(GraphKit& kit, Node* arg) { | |
902 RegionNode *final_merge = new (C, 3) RegionNode(3); | |
903 kit.gvn().set_type(final_merge, Type::CONTROL); | |
904 Node* final_size = new (C, 3) PhiNode(final_merge, TypeInt::INT); | |
905 kit.gvn().set_type(final_size, TypeInt::INT); | |
906 | |
907 IfNode* iff = kit.create_and_map_if(kit.control(), | |
908 __ Bool(__ CmpI(arg, __ intcon(0x80000000)), BoolTest::ne), | |
909 PROB_FAIR, COUNT_UNKNOWN); | |
910 Node* is_min = __ IfFalse(iff); | |
911 final_merge->init_req(1, is_min); | |
912 final_size->init_req(1, __ intcon(11)); | |
913 | |
914 kit.set_control(__ IfTrue(iff)); | |
915 if (kit.stopped()) { | |
916 final_merge->init_req(2, C->top()); | |
917 final_size->init_req(2, C->top()); | |
918 } else { | |
919 | |
920 // int size = (i < 0) ? stringSize(-i) + 1 : stringSize(i); | |
921 RegionNode *r = new (C, 3) RegionNode(3); | |
922 kit.gvn().set_type(r, Type::CONTROL); | |
923 Node *phi = new (C, 3) PhiNode(r, TypeInt::INT); | |
924 kit.gvn().set_type(phi, TypeInt::INT); | |
925 Node *size = new (C, 3) PhiNode(r, TypeInt::INT); | |
926 kit.gvn().set_type(size, TypeInt::INT); | |
927 Node* chk = __ CmpI(arg, __ intcon(0)); | |
928 Node* p = __ Bool(chk, BoolTest::lt); | |
929 IfNode* iff = kit.create_and_map_if(kit.control(), p, PROB_FAIR, COUNT_UNKNOWN); | |
930 Node* lessthan = __ IfTrue(iff); | |
931 Node* greaterequal = __ IfFalse(iff); | |
932 r->init_req(1, lessthan); | |
933 phi->init_req(1, __ SubI(__ intcon(0), arg)); | |
934 size->init_req(1, __ intcon(1)); | |
935 r->init_req(2, greaterequal); | |
936 phi->init_req(2, arg); | |
937 size->init_req(2, __ intcon(0)); | |
938 kit.set_control(r); | |
939 C->record_for_igvn(r); | |
940 C->record_for_igvn(phi); | |
941 C->record_for_igvn(size); | |
942 | |
943 // for (int i=0; ; i++) | |
944 // if (x <= sizeTable[i]) | |
945 // return i+1; | |
946 RegionNode *loop = new (C, 3) RegionNode(3); | |
947 loop->init_req(1, kit.control()); | |
948 kit.gvn().set_type(loop, Type::CONTROL); | |
949 | |
950 Node *index = new (C, 3) PhiNode(loop, TypeInt::INT); | |
951 index->init_req(1, __ intcon(0)); | |
952 kit.gvn().set_type(index, TypeInt::INT); | |
953 kit.set_control(loop); | |
954 Node* sizeTable = fetch_static_field(kit, size_table_field); | |
955 | |
956 Node* value = kit.load_array_element(NULL, sizeTable, index, TypeAryPtr::INTS); | |
957 C->record_for_igvn(value); | |
958 Node* limit = __ CmpI(phi, value); | |
959 Node* limitb = __ Bool(limit, BoolTest::le); | |
960 IfNode* iff2 = kit.create_and_map_if(kit.control(), limitb, PROB_MIN, COUNT_UNKNOWN); | |
961 Node* lessEqual = __ IfTrue(iff2); | |
962 Node* greater = __ IfFalse(iff2); | |
963 | |
964 loop->init_req(2, greater); | |
965 index->init_req(2, __ AddI(index, __ intcon(1))); | |
966 | |
967 kit.set_control(lessEqual); | |
968 C->record_for_igvn(loop); | |
969 C->record_for_igvn(index); | |
970 | |
971 final_merge->init_req(2, kit.control()); | |
972 final_size->init_req(2, __ AddI(__ AddI(index, size), __ intcon(1))); | |
973 } | |
974 | |
975 kit.set_control(final_merge); | |
976 C->record_for_igvn(final_merge); | |
977 C->record_for_igvn(final_size); | |
978 | |
979 return final_size; | |
980 } | |
981 | |
982 void PhaseStringOpts::int_getChars(GraphKit& kit, Node* arg, Node* char_array, Node* start, Node* end) { | |
983 RegionNode *final_merge = new (C, 4) RegionNode(4); | |
984 kit.gvn().set_type(final_merge, Type::CONTROL); | |
985 Node *final_mem = PhiNode::make(final_merge, kit.memory(char_adr_idx), Type::MEMORY, TypeAryPtr::CHARS); | |
986 kit.gvn().set_type(final_mem, Type::MEMORY); | |
987 | |
988 // need to handle Integer.MIN_VALUE specially because negating doesn't make it positive | |
989 { | |
990 // i == MIN_VALUE | |
991 IfNode* iff = kit.create_and_map_if(kit.control(), | |
992 __ Bool(__ CmpI(arg, __ intcon(0x80000000)), BoolTest::ne), | |
993 PROB_FAIR, COUNT_UNKNOWN); | |
994 | |
995 Node* old_mem = kit.memory(char_adr_idx); | |
996 | |
997 kit.set_control(__ IfFalse(iff)); | |
998 if (kit.stopped()) { | |
999 // Statically not equal to MIN_VALUE so this path is dead | |
1000 final_merge->init_req(3, kit.control()); | |
1001 } else { | |
1002 copy_string(kit, __ makecon(TypeInstPtr::make(C->env()->the_min_jint_string())), | |
1003 char_array, start); | |
1004 final_merge->init_req(3, kit.control()); | |
1005 final_mem->init_req(3, kit.memory(char_adr_idx)); | |
1006 } | |
1007 | |
1008 kit.set_control(__ IfTrue(iff)); | |
1009 kit.set_memory(old_mem, char_adr_idx); | |
1010 } | |
1011 | |
1012 | |
1013 // Simplified version of Integer.getChars | |
1014 | |
1015 // int q, r; | |
1016 // int charPos = index; | |
1017 Node* charPos = end; | |
1018 | |
1019 // char sign = 0; | |
1020 | |
1021 Node* i = arg; | |
1022 Node* sign = __ intcon(0); | |
1023 | |
1024 // if (i < 0) { | |
1025 // sign = '-'; | |
1026 // i = -i; | |
1027 // } | |
1028 { | |
1029 IfNode* iff = kit.create_and_map_if(kit.control(), | |
1030 __ Bool(__ CmpI(arg, __ intcon(0)), BoolTest::lt), | |
1031 PROB_FAIR, COUNT_UNKNOWN); | |
1032 | |
1033 RegionNode *merge = new (C, 3) RegionNode(3); | |
1034 kit.gvn().set_type(merge, Type::CONTROL); | |
1035 i = new (C, 3) PhiNode(merge, TypeInt::INT); | |
1036 kit.gvn().set_type(i, TypeInt::INT); | |
1037 sign = new (C, 3) PhiNode(merge, TypeInt::INT); | |
1038 kit.gvn().set_type(sign, TypeInt::INT); | |
1039 | |
1040 merge->init_req(1, __ IfTrue(iff)); | |
1041 i->init_req(1, __ SubI(__ intcon(0), arg)); | |
1042 sign->init_req(1, __ intcon('-')); | |
1043 merge->init_req(2, __ IfFalse(iff)); | |
1044 i->init_req(2, arg); | |
1045 sign->init_req(2, __ intcon(0)); | |
1046 | |
1047 kit.set_control(merge); | |
1048 | |
1049 C->record_for_igvn(merge); | |
1050 C->record_for_igvn(i); | |
1051 C->record_for_igvn(sign); | |
1052 } | |
1053 | |
1054 // for (;;) { | |
1055 // q = i / 10; | |
1056 // r = i - ((q << 3) + (q << 1)); // r = i-(q*10) ... | |
1057 // buf [--charPos] = digits [r]; | |
1058 // i = q; | |
1059 // if (i == 0) break; | |
1060 // } | |
1061 | |
1062 { | |
1063 RegionNode *head = new (C, 3) RegionNode(3); | |
1064 head->init_req(1, kit.control()); | |
1065 kit.gvn().set_type(head, Type::CONTROL); | |
1066 Node *i_phi = new (C, 3) PhiNode(head, TypeInt::INT); | |
1067 i_phi->init_req(1, i); | |
1068 kit.gvn().set_type(i_phi, TypeInt::INT); | |
1069 charPos = PhiNode::make(head, charPos); | |
1070 kit.gvn().set_type(charPos, TypeInt::INT); | |
1071 Node *mem = PhiNode::make(head, kit.memory(char_adr_idx), Type::MEMORY, TypeAryPtr::CHARS); | |
1072 kit.gvn().set_type(mem, Type::MEMORY); | |
1073 kit.set_control(head); | |
1074 kit.set_memory(mem, char_adr_idx); | |
1075 | |
1250 | 1076 Node* q = __ DivI(NULL, i_phi, __ intcon(10)); |
1080 | 1077 Node* r = __ SubI(i_phi, __ AddI(__ LShiftI(q, __ intcon(3)), |
1078 __ LShiftI(q, __ intcon(1)))); | |
1079 Node* m1 = __ SubI(charPos, __ intcon(1)); | |
1080 Node* ch = __ AddI(r, __ intcon('0')); | |
1081 | |
1082 Node* st = __ store_to_memory(kit.control(), kit.array_element_address(char_array, m1, T_CHAR), | |
1083 ch, T_CHAR, char_adr_idx); | |
1084 | |
1085 | |
1086 IfNode* iff = kit.create_and_map_if(head, __ Bool(__ CmpI(q, __ intcon(0)), BoolTest::ne), | |
1087 PROB_FAIR, COUNT_UNKNOWN); | |
1088 Node* ne = __ IfTrue(iff); | |
1089 Node* eq = __ IfFalse(iff); | |
1090 | |
1091 head->init_req(2, ne); | |
1092 mem->init_req(2, st); | |
1093 i_phi->init_req(2, q); | |
1094 charPos->init_req(2, m1); | |
1095 | |
1096 charPos = m1; | |
1097 | |
1098 kit.set_control(eq); | |
1099 kit.set_memory(st, char_adr_idx); | |
1100 | |
1101 C->record_for_igvn(head); | |
1102 C->record_for_igvn(mem); | |
1103 C->record_for_igvn(i_phi); | |
1104 C->record_for_igvn(charPos); | |
1105 } | |
1106 | |
1107 { | |
1108 // if (sign != 0) { | |
1109 // buf [--charPos] = sign; | |
1110 // } | |
1111 IfNode* iff = kit.create_and_map_if(kit.control(), | |
1112 __ Bool(__ CmpI(sign, __ intcon(0)), BoolTest::ne), | |
1113 PROB_FAIR, COUNT_UNKNOWN); | |
1114 | |
1115 final_merge->init_req(2, __ IfFalse(iff)); | |
1116 final_mem->init_req(2, kit.memory(char_adr_idx)); | |
1117 | |
1118 kit.set_control(__ IfTrue(iff)); | |
1119 if (kit.stopped()) { | |
1120 final_merge->init_req(1, C->top()); | |
1121 final_mem->init_req(1, C->top()); | |
1122 } else { | |
1123 Node* m1 = __ SubI(charPos, __ intcon(1)); | |
1124 Node* st = __ store_to_memory(kit.control(), kit.array_element_address(char_array, m1, T_CHAR), | |
1125 sign, T_CHAR, char_adr_idx); | |
1126 | |
1127 final_merge->init_req(1, kit.control()); | |
1128 final_mem->init_req(1, st); | |
1129 } | |
1130 | |
1131 kit.set_control(final_merge); | |
1132 kit.set_memory(final_mem, char_adr_idx); | |
1133 | |
1134 C->record_for_igvn(final_merge); | |
1135 C->record_for_igvn(final_mem); | |
1136 } | |
1137 } | |
1138 | |
1139 | |
1140 Node* PhaseStringOpts::copy_string(GraphKit& kit, Node* str, Node* char_array, Node* start) { | |
1141 Node* string = str; | |
1142 Node* offset = kit.make_load(NULL, | |
1143 kit.basic_plus_adr(string, string, java_lang_String::offset_offset_in_bytes()), | |
1144 TypeInt::INT, T_INT, offset_field_idx); | |
1145 Node* count = kit.make_load(NULL, | |
1146 kit.basic_plus_adr(string, string, java_lang_String::count_offset_in_bytes()), | |
1147 TypeInt::INT, T_INT, count_field_idx); | |
1148 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull, | |
1149 TypeAry::make(TypeInt::CHAR,TypeInt::POS), | |
1150 ciTypeArrayKlass::make(T_CHAR), true, 0); | |
1151 Node* value = kit.make_load(NULL, | |
1152 kit.basic_plus_adr(string, string, java_lang_String::value_offset_in_bytes()), | |
1153 value_type, T_OBJECT, value_field_idx); | |
1154 | |
1155 // copy the contents | |
1156 if (offset->is_Con() && count->is_Con() && value->is_Con() && count->get_int() < unroll_string_copy_length) { | |
1157 // For small constant strings just emit individual stores. | |
1158 // A length of 6 seems like a good space/speed tradeof. | |
1159 int c = count->get_int(); | |
1160 int o = offset->get_int(); | |
1161 const TypeOopPtr* t = kit.gvn().type(value)->isa_oopptr(); | |
1162 ciTypeArray* value_array = t->const_oop()->as_type_array(); | |
1163 for (int e = 0; e < c; e++) { | |
1164 __ store_to_memory(kit.control(), kit.array_element_address(char_array, start, T_CHAR), | |
1165 __ intcon(value_array->char_at(o + e)), T_CHAR, char_adr_idx); | |
1166 start = __ AddI(start, __ intcon(1)); | |
1167 } | |
1168 } else { | |
1169 Node* src_ptr = kit.array_element_address(value, offset, T_CHAR); | |
1170 Node* dst_ptr = kit.array_element_address(char_array, start, T_CHAR); | |
1171 Node* c = count; | |
1172 Node* extra = NULL; | |
1173 #ifdef _LP64 | |
1174 c = __ ConvI2L(c); | |
1175 extra = C->top(); | |
1176 #endif | |
1177 Node* call = kit.make_runtime_call(GraphKit::RC_LEAF|GraphKit::RC_NO_FP, | |
1178 OptoRuntime::fast_arraycopy_Type(), | |
1179 CAST_FROM_FN_PTR(address, StubRoutines::jshort_disjoint_arraycopy()), | |
1180 "jshort_disjoint_arraycopy", TypeAryPtr::CHARS, | |
1181 src_ptr, dst_ptr, c, extra); | |
1182 start = __ AddI(start, count); | |
1183 } | |
1184 return start; | |
1185 } | |
1186 | |
1187 | |
1188 void PhaseStringOpts::replace_string_concat(StringConcat* sc) { | |
1189 // Log a little info about the transformation | |
1190 sc->maybe_log_transform(); | |
1191 | |
1192 // pull the JVMState of the allocation into a SafePointNode to serve as | |
1193 // as a shim for the insertion of the new code. | |
1194 JVMState* jvms = sc->begin()->jvms()->clone_shallow(C); | |
1195 uint size = sc->begin()->req(); | |
1196 SafePointNode* map = new (C, size) SafePointNode(size, jvms); | |
1197 | |
1198 // copy the control and memory state from the final call into our | |
1199 // new starting state. This allows any preceeding tests to feed | |
1200 // into the new section of code. | |
1201 for (uint i1 = 0; i1 < TypeFunc::Parms; i1++) { | |
1202 map->init_req(i1, sc->end()->in(i1)); | |
1203 } | |
1204 // blow away old allocation arguments | |
1205 for (uint i1 = TypeFunc::Parms; i1 < jvms->debug_start(); i1++) { | |
1206 map->init_req(i1, C->top()); | |
1207 } | |
1208 // Copy the rest of the inputs for the JVMState | |
1209 for (uint i1 = jvms->debug_start(); i1 < sc->begin()->req(); i1++) { | |
1210 map->init_req(i1, sc->begin()->in(i1)); | |
1211 } | |
1212 // Make sure the memory state is a MergeMem for parsing. | |
1213 if (!map->in(TypeFunc::Memory)->is_MergeMem()) { | |
1214 map->set_req(TypeFunc::Memory, MergeMemNode::make(C, map->in(TypeFunc::Memory))); | |
1215 } | |
1216 | |
1217 jvms->set_map(map); | |
1218 map->ensure_stack(jvms, jvms->method()->max_stack()); | |
1219 | |
1220 | |
1221 // disconnect all the old StringBuilder calls from the graph | |
1222 sc->eliminate_unneeded_control(); | |
1223 | |
1224 // At this point all the old work has been completely removed from | |
1225 // the graph and the saved JVMState exists at the point where the | |
1226 // final toString call used to be. | |
1227 GraphKit kit(jvms); | |
1228 | |
1229 // There may be uncommon traps which are still using the | |
1230 // intermediate states and these need to be rewritten to point at | |
1231 // the JVMState at the beginning of the transformation. | |
1232 sc->convert_uncommon_traps(kit, jvms); | |
1233 | |
1234 // Now insert the logic to compute the size of the string followed | |
1235 // by all the logic to construct array and resulting string. | |
1236 | |
1237 Node* null_string = __ makecon(TypeInstPtr::make(C->env()->the_null_string())); | |
1238 | |
1239 // Create a region for the overflow checks to merge into. | |
1240 int args = MAX2(sc->num_arguments(), 1); | |
1241 RegionNode* overflow = new (C, args) RegionNode(args); | |
1242 kit.gvn().set_type(overflow, Type::CONTROL); | |
1243 | |
1244 // Create a hook node to hold onto the individual sizes since they | |
1245 // are need for the copying phase. | |
1246 Node* string_sizes = new (C, args) Node(args); | |
1247 | |
1248 Node* length = __ intcon(0); | |
1249 for (int argi = 0; argi < sc->num_arguments(); argi++) { | |
1250 Node* arg = sc->argument(argi); | |
1251 switch (sc->mode(argi)) { | |
1252 case StringConcat::IntMode: { | |
1253 Node* string_size = int_stringSize(kit, arg); | |
1254 | |
1255 // accumulate total | |
1256 length = __ AddI(length, string_size); | |
1257 | |
1258 // Cache this value for the use by int_toString | |
1259 string_sizes->init_req(argi, string_size); | |
1260 break; | |
1261 } | |
1262 case StringConcat::StringMode: { | |
1263 const Type* type = kit.gvn().type(arg); | |
1264 if (type == TypePtr::NULL_PTR) { | |
1265 // replace the argument with the null checked version | |
1266 arg = null_string; | |
1267 sc->set_argument(argi, arg); | |
1268 } else if (!type->higher_equal(TypeInstPtr::NOTNULL)) { | |
1269 // s = s != null ? s : "null"; | |
1270 // length = length + (s.count - s.offset); | |
1271 RegionNode *r = new (C, 3) RegionNode(3); | |
1272 kit.gvn().set_type(r, Type::CONTROL); | |
1250 | 1273 Node *phi = new (C, 3) PhiNode(r, type); |
1080 | 1274 kit.gvn().set_type(phi, phi->bottom_type()); |
1275 Node* p = __ Bool(__ CmpP(arg, kit.null()), BoolTest::ne); | |
1276 IfNode* iff = kit.create_and_map_if(kit.control(), p, PROB_MIN, COUNT_UNKNOWN); | |
1277 Node* notnull = __ IfTrue(iff); | |
1278 Node* isnull = __ IfFalse(iff); | |
1250 | 1279 kit.set_control(notnull); // set control for the cast_not_null |
1080 | 1280 r->init_req(1, notnull); |
1250 | 1281 phi->init_req(1, kit.cast_not_null(arg, false)); |
1080 | 1282 r->init_req(2, isnull); |
1283 phi->init_req(2, null_string); | |
1284 kit.set_control(r); | |
1285 C->record_for_igvn(r); | |
1286 C->record_for_igvn(phi); | |
1287 // replace the argument with the null checked version | |
1288 arg = phi; | |
1289 sc->set_argument(argi, arg); | |
1290 } | |
1291 // Node* offset = kit.make_load(NULL, kit.basic_plus_adr(arg, arg, offset_offset), | |
1292 // TypeInt::INT, T_INT, offset_field_idx); | |
1293 Node* count = kit.make_load(NULL, kit.basic_plus_adr(arg, arg, java_lang_String::count_offset_in_bytes()), | |
1294 TypeInt::INT, T_INT, count_field_idx); | |
1295 length = __ AddI(length, count); | |
1296 string_sizes->init_req(argi, NULL); | |
1297 break; | |
1298 } | |
1299 case StringConcat::CharMode: { | |
1300 // one character only | |
1301 length = __ AddI(length, __ intcon(1)); | |
1302 break; | |
1303 } | |
1304 default: | |
1305 ShouldNotReachHere(); | |
1306 } | |
1307 if (argi > 0) { | |
1308 // Check that the sum hasn't overflowed | |
1309 IfNode* iff = kit.create_and_map_if(kit.control(), | |
1310 __ Bool(__ CmpI(length, __ intcon(0)), BoolTest::lt), | |
1311 PROB_MIN, COUNT_UNKNOWN); | |
1312 kit.set_control(__ IfFalse(iff)); | |
1313 overflow->set_req(argi, __ IfTrue(iff)); | |
1314 } | |
1315 } | |
1316 | |
1317 { | |
1318 // Hook | |
1319 PreserveJVMState pjvms(&kit); | |
1320 kit.set_control(overflow); | |
1321 kit.uncommon_trap(Deoptimization::Reason_intrinsic, | |
1322 Deoptimization::Action_make_not_entrant); | |
1323 } | |
1324 | |
1325 // length now contains the number of characters needed for the | |
1326 // char[] so create a new AllocateArray for the char[] | |
1327 Node* char_array = NULL; | |
1328 { | |
1329 PreserveReexecuteState preexecs(&kit); | |
1330 // The original jvms is for an allocation of either a String or | |
1331 // StringBuffer so no stack adjustment is necessary for proper | |
1332 // reexecution. If we deoptimize in the slow path the bytecode | |
1333 // will be reexecuted and the char[] allocation will be thrown away. | |
1334 kit.jvms()->set_should_reexecute(true); | |
1335 char_array = kit.new_array(__ makecon(TypeKlassPtr::make(ciTypeArrayKlass::make(T_CHAR))), | |
1336 length, 1); | |
1337 } | |
1338 | |
1339 // Mark the allocation so that zeroing is skipped since the code | |
1340 // below will overwrite the entire array | |
1341 AllocateArrayNode* char_alloc = AllocateArrayNode::Ideal_array_allocation(char_array, _gvn); | |
1342 char_alloc->maybe_set_complete(_gvn); | |
1343 | |
1344 // Now copy the string representations into the final char[] | |
1345 Node* start = __ intcon(0); | |
1346 for (int argi = 0; argi < sc->num_arguments(); argi++) { | |
1347 Node* arg = sc->argument(argi); | |
1348 switch (sc->mode(argi)) { | |
1349 case StringConcat::IntMode: { | |
1350 Node* end = __ AddI(start, string_sizes->in(argi)); | |
1351 // getChars words backwards so pass the ending point as well as the start | |
1352 int_getChars(kit, arg, char_array, start, end); | |
1353 start = end; | |
1354 break; | |
1355 } | |
1356 case StringConcat::StringMode: { | |
1357 start = copy_string(kit, arg, char_array, start); | |
1358 break; | |
1359 } | |
1360 case StringConcat::CharMode: { | |
1361 __ store_to_memory(kit.control(), kit.array_element_address(char_array, start, T_CHAR), | |
1362 arg, T_CHAR, char_adr_idx); | |
1363 start = __ AddI(start, __ intcon(1)); | |
1364 break; | |
1365 } | |
1366 default: | |
1367 ShouldNotReachHere(); | |
1368 } | |
1369 } | |
1370 | |
1371 // If we're not reusing an existing String allocation then allocate one here. | |
1372 Node* result = sc->string_alloc(); | |
1373 if (result == NULL) { | |
1374 PreserveReexecuteState preexecs(&kit); | |
1375 // The original jvms is for an allocation of either a String or | |
1376 // StringBuffer so no stack adjustment is necessary for proper | |
1377 // reexecution. | |
1378 kit.jvms()->set_should_reexecute(true); | |
1379 result = kit.new_instance(__ makecon(TypeKlassPtr::make(C->env()->String_klass()))); | |
1380 } | |
1381 | |
1382 // Intialize the string | |
1383 kit.store_to_memory(kit.control(), kit.basic_plus_adr(result, java_lang_String::offset_offset_in_bytes()), | |
1384 __ intcon(0), T_INT, offset_field_idx); | |
1385 kit.store_to_memory(kit.control(), kit.basic_plus_adr(result, java_lang_String::count_offset_in_bytes()), | |
1386 length, T_INT, count_field_idx); | |
1387 kit.store_to_memory(kit.control(), kit.basic_plus_adr(result, java_lang_String::value_offset_in_bytes()), | |
1388 char_array, T_OBJECT, value_field_idx); | |
1389 | |
1390 // hook up the outgoing control and result | |
1391 kit.replace_call(sc->end(), result); | |
1392 | |
1393 // Unhook any hook nodes | |
1394 string_sizes->disconnect_inputs(NULL); | |
1395 sc->cleanup(); | |
1396 } |