Mercurial > hg > truffle
annotate src/share/vm/opto/stringopts.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
author | stefank |
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date | Tue, 23 Nov 2010 13:22:55 -0800 |
parents | c40600e85311 |
children | 2ddb2fab82cb |
rev | line source |
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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 |
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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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "compiler/compileLog.hpp" | |
27 #include "opto/addnode.hpp" | |
28 #include "opto/callGenerator.hpp" | |
29 #include "opto/callnode.hpp" | |
30 #include "opto/divnode.hpp" | |
31 #include "opto/graphKit.hpp" | |
32 #include "opto/idealKit.hpp" | |
33 #include "opto/rootnode.hpp" | |
34 #include "opto/runtime.hpp" | |
35 #include "opto/stringopts.hpp" | |
36 #include "opto/subnode.hpp" | |
1080 | 37 |
38 #define __ kit. | |
39 | |
40 class StringConcat : public ResourceObj { | |
41 private: | |
42 PhaseStringOpts* _stringopts; | |
43 Node* _string_alloc; | |
44 AllocateNode* _begin; // The allocation the begins the pattern | |
45 CallStaticJavaNode* _end; // The final call of the pattern. Will either be | |
46 // SB.toString or or String.<init>(SB.toString) | |
47 bool _multiple; // indicates this is a fusion of two or more | |
48 // separate StringBuilders | |
49 | |
50 Node* _arguments; // The list of arguments to be concatenated | |
51 GrowableArray<int> _mode; // into a String along with a mode flag | |
52 // indicating how to treat the value. | |
53 | |
54 Node_List _control; // List of control nodes that will be deleted | |
55 Node_List _uncommon_traps; // Uncommon traps that needs to be rewritten | |
56 // to restart at the initial JVMState. | |
57 public: | |
58 // Mode for converting arguments to Strings | |
59 enum { | |
60 StringMode, | |
61 IntMode, | |
62 CharMode | |
63 }; | |
64 | |
65 StringConcat(PhaseStringOpts* stringopts, CallStaticJavaNode* end): | |
66 _end(end), | |
67 _begin(NULL), | |
68 _multiple(false), | |
69 _string_alloc(NULL), | |
70 _stringopts(stringopts) { | |
71 _arguments = new (_stringopts->C, 1) Node(1); | |
72 _arguments->del_req(0); | |
73 } | |
74 | |
75 bool validate_control_flow(); | |
76 | |
77 void merge_add() { | |
78 #if 0 | |
79 // XXX This is place holder code for reusing an existing String | |
80 // allocation but the logic for checking the state safety is | |
81 // probably inadequate at the moment. | |
82 CallProjections endprojs; | |
83 sc->end()->extract_projections(&endprojs, false); | |
84 if (endprojs.resproj != NULL) { | |
85 for (SimpleDUIterator i(endprojs.resproj); i.has_next(); i.next()) { | |
86 CallStaticJavaNode *use = i.get()->isa_CallStaticJava(); | |
87 if (use != NULL && use->method() != NULL && | |
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88 use->method()->intrinsic_id() == vmIntrinsics::_String_String && |
1080 | 89 use->in(TypeFunc::Parms + 1) == endprojs.resproj) { |
90 // Found useless new String(sb.toString()) so reuse the newly allocated String | |
91 // when creating the result instead of allocating a new one. | |
92 sc->set_string_alloc(use->in(TypeFunc::Parms)); | |
93 sc->set_end(use); | |
94 } | |
95 } | |
96 } | |
97 #endif | |
98 } | |
99 | |
100 StringConcat* merge(StringConcat* other, Node* arg); | |
101 | |
102 void set_allocation(AllocateNode* alloc) { | |
103 _begin = alloc; | |
104 } | |
105 | |
106 void append(Node* value, int mode) { | |
107 _arguments->add_req(value); | |
108 _mode.append(mode); | |
109 } | |
110 void push(Node* value, int mode) { | |
111 _arguments->ins_req(0, value); | |
112 _mode.insert_before(0, mode); | |
113 } | |
114 void push_string(Node* value) { | |
115 push(value, StringMode); | |
116 } | |
117 void push_int(Node* value) { | |
118 push(value, IntMode); | |
119 } | |
120 void push_char(Node* value) { | |
121 push(value, CharMode); | |
122 } | |
123 | |
124 Node* argument(int i) { | |
125 return _arguments->in(i); | |
126 } | |
127 void set_argument(int i, Node* value) { | |
128 _arguments->set_req(i, value); | |
129 } | |
130 int num_arguments() { | |
131 return _mode.length(); | |
132 } | |
133 int mode(int i) { | |
134 return _mode.at(i); | |
135 } | |
136 void add_control(Node* ctrl) { | |
137 assert(!_control.contains(ctrl), "only push once"); | |
138 _control.push(ctrl); | |
139 } | |
140 CallStaticJavaNode* end() { return _end; } | |
141 AllocateNode* begin() { return _begin; } | |
142 Node* string_alloc() { return _string_alloc; } | |
143 | |
144 void eliminate_unneeded_control(); | |
145 void eliminate_initialize(InitializeNode* init); | |
146 void eliminate_call(CallNode* call); | |
147 | |
148 void maybe_log_transform() { | |
149 CompileLog* log = _stringopts->C->log(); | |
150 if (log != NULL) { | |
151 log->head("replace_string_concat arguments='%d' string_alloc='%d' multiple='%d'", | |
152 num_arguments(), | |
153 _string_alloc != NULL, | |
154 _multiple); | |
155 JVMState* p = _begin->jvms(); | |
156 while (p != NULL) { | |
157 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); | |
158 p = p->caller(); | |
159 } | |
160 log->tail("replace_string_concat"); | |
161 } | |
162 } | |
163 | |
164 void convert_uncommon_traps(GraphKit& kit, const JVMState* jvms) { | |
165 for (uint u = 0; u < _uncommon_traps.size(); u++) { | |
166 Node* uct = _uncommon_traps.at(u); | |
167 | |
168 // Build a new call using the jvms state of the allocate | |
1748 | 169 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point(); |
1080 | 170 const TypeFunc* call_type = OptoRuntime::uncommon_trap_Type(); |
171 int size = call_type->domain()->cnt(); | |
172 const TypePtr* no_memory_effects = NULL; | |
173 Compile* C = _stringopts->C; | |
174 CallStaticJavaNode* call = new (C, size) CallStaticJavaNode(call_type, call_addr, "uncommon_trap", | |
175 jvms->bci(), no_memory_effects); | |
176 for (int e = 0; e < TypeFunc::Parms; e++) { | |
177 call->init_req(e, uct->in(e)); | |
178 } | |
179 // Set the trap request to record intrinsic failure if this trap | |
180 // is taken too many times. Ideally we would handle then traps by | |
181 // doing the original bookkeeping in the MDO so that if it caused | |
182 // the code to be thrown out we could still recompile and use the | |
183 // optimization. Failing the uncommon traps doesn't really mean | |
184 // that the optimization is a bad idea but there's no other way to | |
185 // do the MDO updates currently. | |
186 int trap_request = Deoptimization::make_trap_request(Deoptimization::Reason_intrinsic, | |
187 Deoptimization::Action_make_not_entrant); | |
188 call->init_req(TypeFunc::Parms, __ intcon(trap_request)); | |
189 kit.add_safepoint_edges(call); | |
190 | |
191 _stringopts->gvn()->transform(call); | |
192 C->gvn_replace_by(uct, call); | |
193 uct->disconnect_inputs(NULL); | |
194 } | |
195 } | |
196 | |
197 void cleanup() { | |
198 // disconnect the hook node | |
199 _arguments->disconnect_inputs(NULL); | |
200 } | |
201 }; | |
202 | |
203 | |
204 void StringConcat::eliminate_unneeded_control() { | |
205 eliminate_initialize(begin()->initialization()); | |
206 for (uint i = 0; i < _control.size(); i++) { | |
207 Node* n = _control.at(i); | |
208 if (n->is_Call()) { | |
209 if (n != _end) { | |
210 eliminate_call(n->as_Call()); | |
211 } | |
212 } else if (n->is_IfTrue()) { | |
213 Compile* C = _stringopts->C; | |
214 C->gvn_replace_by(n, n->in(0)->in(0)); | |
215 C->gvn_replace_by(n->in(0), C->top()); | |
216 } | |
217 } | |
218 } | |
219 | |
220 | |
221 StringConcat* StringConcat::merge(StringConcat* other, Node* arg) { | |
222 StringConcat* result = new StringConcat(_stringopts, _end); | |
223 for (uint x = 0; x < _control.size(); x++) { | |
224 Node* n = _control.at(x); | |
225 if (n->is_Call()) { | |
226 result->_control.push(n); | |
227 } | |
228 } | |
229 for (uint x = 0; x < other->_control.size(); x++) { | |
230 Node* n = other->_control.at(x); | |
231 if (n->is_Call()) { | |
232 result->_control.push(n); | |
233 } | |
234 } | |
235 assert(result->_control.contains(other->_end), "what?"); | |
236 assert(result->_control.contains(_begin), "what?"); | |
237 for (int x = 0; x < num_arguments(); x++) { | |
238 if (argument(x) == arg) { | |
239 // replace the toString result with the all the arguments that | |
240 // made up the other StringConcat | |
241 for (int y = 0; y < other->num_arguments(); y++) { | |
242 result->append(other->argument(y), other->mode(y)); | |
243 } | |
244 } else { | |
245 result->append(argument(x), mode(x)); | |
246 } | |
247 } | |
248 result->set_allocation(other->_begin); | |
249 result->_multiple = true; | |
250 return result; | |
251 } | |
252 | |
253 | |
254 void StringConcat::eliminate_call(CallNode* call) { | |
255 Compile* C = _stringopts->C; | |
256 CallProjections projs; | |
257 call->extract_projections(&projs, false); | |
258 if (projs.fallthrough_catchproj != NULL) { | |
259 C->gvn_replace_by(projs.fallthrough_catchproj, call->in(TypeFunc::Control)); | |
260 } | |
261 if (projs.fallthrough_memproj != NULL) { | |
262 C->gvn_replace_by(projs.fallthrough_memproj, call->in(TypeFunc::Memory)); | |
263 } | |
264 if (projs.catchall_memproj != NULL) { | |
265 C->gvn_replace_by(projs.catchall_memproj, C->top()); | |
266 } | |
267 if (projs.fallthrough_ioproj != NULL) { | |
268 C->gvn_replace_by(projs.fallthrough_ioproj, call->in(TypeFunc::I_O)); | |
269 } | |
270 if (projs.catchall_ioproj != NULL) { | |
271 C->gvn_replace_by(projs.catchall_ioproj, C->top()); | |
272 } | |
273 if (projs.catchall_catchproj != NULL) { | |
274 // EA can't cope with the partially collapsed graph this | |
275 // creates so put it on the worklist to be collapsed later. | |
276 for (SimpleDUIterator i(projs.catchall_catchproj); i.has_next(); i.next()) { | |
277 Node *use = i.get(); | |
278 int opc = use->Opcode(); | |
279 if (opc == Op_CreateEx || opc == Op_Region) { | |
280 _stringopts->record_dead_node(use); | |
281 } | |
282 } | |
283 C->gvn_replace_by(projs.catchall_catchproj, C->top()); | |
284 } | |
285 if (projs.resproj != NULL) { | |
286 C->gvn_replace_by(projs.resproj, C->top()); | |
287 } | |
288 C->gvn_replace_by(call, C->top()); | |
289 } | |
290 | |
291 void StringConcat::eliminate_initialize(InitializeNode* init) { | |
292 Compile* C = _stringopts->C; | |
293 | |
294 // Eliminate Initialize node. | |
295 assert(init->outcnt() <= 2, "only a control and memory projection expected"); | |
296 assert(init->req() <= InitializeNode::RawStores, "no pending inits"); | |
297 Node *ctrl_proj = init->proj_out(TypeFunc::Control); | |
298 if (ctrl_proj != NULL) { | |
299 C->gvn_replace_by(ctrl_proj, init->in(TypeFunc::Control)); | |
300 } | |
301 Node *mem_proj = init->proj_out(TypeFunc::Memory); | |
302 if (mem_proj != NULL) { | |
303 Node *mem = init->in(TypeFunc::Memory); | |
304 C->gvn_replace_by(mem_proj, mem); | |
305 } | |
306 C->gvn_replace_by(init, C->top()); | |
307 init->disconnect_inputs(NULL); | |
308 } | |
309 | |
310 Node_List PhaseStringOpts::collect_toString_calls() { | |
311 Node_List string_calls; | |
312 Node_List worklist; | |
313 | |
314 _visited.Clear(); | |
315 | |
316 // Prime the worklist | |
317 for (uint i = 1; i < C->root()->len(); i++) { | |
318 Node* n = C->root()->in(i); | |
319 if (n != NULL && !_visited.test_set(n->_idx)) { | |
320 worklist.push(n); | |
321 } | |
322 } | |
323 | |
324 while (worklist.size() > 0) { | |
325 Node* ctrl = worklist.pop(); | |
326 if (ctrl->is_CallStaticJava()) { | |
327 CallStaticJavaNode* csj = ctrl->as_CallStaticJava(); | |
328 ciMethod* m = csj->method(); | |
329 if (m != NULL && | |
330 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || | |
331 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) { | |
332 string_calls.push(csj); | |
333 } | |
334 } | |
335 if (ctrl->in(0) != NULL && !_visited.test_set(ctrl->in(0)->_idx)) { | |
336 worklist.push(ctrl->in(0)); | |
337 } | |
338 if (ctrl->is_Region()) { | |
339 for (uint i = 1; i < ctrl->len(); i++) { | |
340 if (ctrl->in(i) != NULL && !_visited.test_set(ctrl->in(i)->_idx)) { | |
341 worklist.push(ctrl->in(i)); | |
342 } | |
343 } | |
344 } | |
345 } | |
346 return string_calls; | |
347 } | |
348 | |
349 | |
350 StringConcat* PhaseStringOpts::build_candidate(CallStaticJavaNode* call) { | |
351 ciMethod* m = call->method(); | |
352 ciSymbol* string_sig; | |
353 ciSymbol* int_sig; | |
354 ciSymbol* char_sig; | |
355 if (m->holder() == C->env()->StringBuilder_klass()) { | |
356 string_sig = ciSymbol::String_StringBuilder_signature(); | |
357 int_sig = ciSymbol::int_StringBuilder_signature(); | |
358 char_sig = ciSymbol::char_StringBuilder_signature(); | |
359 } else if (m->holder() == C->env()->StringBuffer_klass()) { | |
360 string_sig = ciSymbol::String_StringBuffer_signature(); | |
361 int_sig = ciSymbol::int_StringBuffer_signature(); | |
362 char_sig = ciSymbol::char_StringBuffer_signature(); | |
363 } else { | |
364 return NULL; | |
365 } | |
366 #ifndef PRODUCT | |
367 if (PrintOptimizeStringConcat) { | |
368 tty->print("considering toString call in "); | |
369 call->jvms()->dump_spec(tty); tty->cr(); | |
370 } | |
371 #endif | |
372 | |
373 StringConcat* sc = new StringConcat(this, call); | |
374 | |
375 AllocateNode* alloc = NULL; | |
376 InitializeNode* init = NULL; | |
377 | |
378 // possible opportunity for StringBuilder fusion | |
379 CallStaticJavaNode* cnode = call; | |
380 while (cnode) { | |
381 Node* recv = cnode->in(TypeFunc::Parms)->uncast(); | |
382 if (recv->is_Proj()) { | |
383 recv = recv->in(0); | |
384 } | |
385 cnode = recv->isa_CallStaticJava(); | |
386 if (cnode == NULL) { | |
387 alloc = recv->isa_Allocate(); | |
388 if (alloc == NULL) { | |
389 break; | |
390 } | |
391 // Find the constructor call | |
392 Node* result = alloc->result_cast(); | |
393 if (result == NULL || !result->is_CheckCastPP()) { | |
394 // strange looking allocation | |
395 #ifndef PRODUCT | |
396 if (PrintOptimizeStringConcat) { | |
397 tty->print("giving up because allocation looks strange "); | |
398 alloc->jvms()->dump_spec(tty); tty->cr(); | |
399 } | |
400 #endif | |
401 break; | |
402 } | |
403 Node* constructor = NULL; | |
404 for (SimpleDUIterator i(result); i.has_next(); i.next()) { | |
405 CallStaticJavaNode *use = i.get()->isa_CallStaticJava(); | |
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406 if (use != NULL && |
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407 use->method() != NULL && |
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408 !use->method()->is_static() && |
1080 | 409 use->method()->name() == ciSymbol::object_initializer_name() && |
410 use->method()->holder() == m->holder()) { | |
411 // Matched the constructor. | |
412 ciSymbol* sig = use->method()->signature()->as_symbol(); | |
413 if (sig == ciSymbol::void_method_signature() || | |
414 sig == ciSymbol::int_void_signature() || | |
415 sig == ciSymbol::string_void_signature()) { | |
416 if (sig == ciSymbol::string_void_signature()) { | |
417 // StringBuilder(String) so pick this up as the first argument | |
418 assert(use->in(TypeFunc::Parms + 1) != NULL, "what?"); | |
419 sc->push_string(use->in(TypeFunc::Parms + 1)); | |
420 } | |
421 // The int variant takes an initial size for the backing | |
422 // array so just treat it like the void version. | |
423 constructor = use; | |
424 } else { | |
425 #ifndef PRODUCT | |
426 if (PrintOptimizeStringConcat) { | |
427 tty->print("unexpected constructor signature: %s", sig->as_utf8()); | |
428 } | |
429 #endif | |
430 } | |
431 break; | |
432 } | |
433 } | |
434 if (constructor == NULL) { | |
435 // couldn't find constructor | |
436 #ifndef PRODUCT | |
437 if (PrintOptimizeStringConcat) { | |
438 tty->print("giving up because couldn't find constructor "); | |
439 alloc->jvms()->dump_spec(tty); | |
440 } | |
441 #endif | |
442 break; | |
443 } | |
444 | |
445 // Walked all the way back and found the constructor call so see | |
446 // if this call converted into a direct string concatenation. | |
447 sc->add_control(call); | |
448 sc->add_control(constructor); | |
449 sc->add_control(alloc); | |
450 sc->set_allocation(alloc); | |
451 if (sc->validate_control_flow()) { | |
452 return sc; | |
453 } else { | |
454 return NULL; | |
455 } | |
456 } else if (cnode->method() == NULL) { | |
457 break; | |
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458 } else if (!cnode->method()->is_static() && |
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459 cnode->method()->holder() == m->holder() && |
1080 | 460 cnode->method()->name() == ciSymbol::append_name() && |
461 (cnode->method()->signature()->as_symbol() == string_sig || | |
462 cnode->method()->signature()->as_symbol() == char_sig || | |
463 cnode->method()->signature()->as_symbol() == int_sig)) { | |
464 sc->add_control(cnode); | |
465 Node* arg = cnode->in(TypeFunc::Parms + 1); | |
466 if (cnode->method()->signature()->as_symbol() == int_sig) { | |
467 sc->push_int(arg); | |
468 } else if (cnode->method()->signature()->as_symbol() == char_sig) { | |
469 sc->push_char(arg); | |
470 } else { | |
471 if (arg->is_Proj() && arg->in(0)->is_CallStaticJava()) { | |
472 CallStaticJavaNode* csj = arg->in(0)->as_CallStaticJava(); | |
473 if (csj->method() != NULL && | |
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474 csj->method()->intrinsic_id() == vmIntrinsics::_Integer_toString) { |
1080 | 475 sc->add_control(csj); |
476 sc->push_int(csj->in(TypeFunc::Parms)); | |
477 continue; | |
478 } | |
479 } | |
480 sc->push_string(arg); | |
481 } | |
482 continue; | |
483 } else { | |
484 // some unhandled signature | |
485 #ifndef PRODUCT | |
486 if (PrintOptimizeStringConcat) { | |
487 tty->print("giving up because encountered unexpected signature "); | |
488 cnode->tf()->dump(); tty->cr(); | |
489 cnode->in(TypeFunc::Parms + 1)->dump(); | |
490 } | |
491 #endif | |
492 break; | |
493 } | |
494 } | |
495 return NULL; | |
496 } | |
497 | |
498 | |
499 PhaseStringOpts::PhaseStringOpts(PhaseGVN* gvn, Unique_Node_List*): | |
500 Phase(StringOpts), | |
501 _gvn(gvn), | |
502 _visited(Thread::current()->resource_area()) { | |
503 | |
504 assert(OptimizeStringConcat, "shouldn't be here"); | |
505 | |
506 size_table_field = C->env()->Integer_klass()->get_field_by_name(ciSymbol::make("sizeTable"), | |
507 ciSymbol::make("[I"), true); | |
508 if (size_table_field == NULL) { | |
509 // Something wrong so give up. | |
510 assert(false, "why can't we find Integer.sizeTable?"); | |
511 return; | |
512 } | |
513 | |
514 // Collect the types needed to talk about the various slices of memory | |
515 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
516 false, NULL, 0); | |
517 | |
518 const TypePtr* value_field_type = string_type->add_offset(java_lang_String::value_offset_in_bytes()); | |
519 const TypePtr* offset_field_type = string_type->add_offset(java_lang_String::offset_offset_in_bytes()); | |
520 const TypePtr* count_field_type = string_type->add_offset(java_lang_String::count_offset_in_bytes()); | |
521 | |
522 value_field_idx = C->get_alias_index(value_field_type); | |
523 count_field_idx = C->get_alias_index(count_field_type); | |
524 offset_field_idx = C->get_alias_index(offset_field_type); | |
525 char_adr_idx = C->get_alias_index(TypeAryPtr::CHARS); | |
526 | |
527 // For each locally allocated StringBuffer see if the usages can be | |
528 // collapsed into a single String construction. | |
529 | |
530 // Run through the list of allocation looking for SB.toString to see | |
531 // if it's possible to fuse the usage of the SB into a single String | |
532 // construction. | |
533 GrowableArray<StringConcat*> concats; | |
534 Node_List toStrings = collect_toString_calls(); | |
535 while (toStrings.size() > 0) { | |
536 StringConcat* sc = build_candidate(toStrings.pop()->as_CallStaticJava()); | |
537 if (sc != NULL) { | |
538 concats.push(sc); | |
539 } | |
540 } | |
541 | |
542 // try to coalesce separate concats | |
543 restart: | |
544 for (int c = 0; c < concats.length(); c++) { | |
545 StringConcat* sc = concats.at(c); | |
546 for (int i = 0; i < sc->num_arguments(); i++) { | |
547 Node* arg = sc->argument(i); | |
548 if (arg->is_Proj() && arg->in(0)->is_CallStaticJava()) { | |
549 CallStaticJavaNode* csj = arg->in(0)->as_CallStaticJava(); | |
550 if (csj->method() != NULL && | |
1817
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551 (csj->method()->intrinsic_id() == vmIntrinsics::_StringBuilder_toString || |
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552 csj->method()->intrinsic_id() == vmIntrinsics::_StringBuffer_toString)) { |
1080 | 553 for (int o = 0; o < concats.length(); o++) { |
554 if (c == o) continue; | |
555 StringConcat* other = concats.at(o); | |
556 if (other->end() == csj) { | |
557 #ifndef PRODUCT | |
558 if (PrintOptimizeStringConcat) { | |
559 tty->print_cr("considering stacked concats"); | |
560 } | |
561 #endif | |
562 | |
563 StringConcat* merged = sc->merge(other, arg); | |
564 if (merged->validate_control_flow()) { | |
565 #ifndef PRODUCT | |
566 if (PrintOptimizeStringConcat) { | |
567 tty->print_cr("stacking would succeed"); | |
568 } | |
569 #endif | |
570 if (c < o) { | |
571 concats.remove_at(o); | |
572 concats.at_put(c, merged); | |
573 } else { | |
574 concats.remove_at(c); | |
575 concats.at_put(o, merged); | |
576 } | |
577 goto restart; | |
578 } else { | |
579 #ifndef PRODUCT | |
580 if (PrintOptimizeStringConcat) { | |
581 tty->print_cr("stacking would fail"); | |
582 } | |
583 #endif | |
584 } | |
585 } | |
586 } | |
587 } | |
588 } | |
589 } | |
590 } | |
591 | |
592 | |
593 for (int c = 0; c < concats.length(); c++) { | |
594 StringConcat* sc = concats.at(c); | |
595 replace_string_concat(sc); | |
596 } | |
597 | |
598 remove_dead_nodes(); | |
599 } | |
600 | |
601 void PhaseStringOpts::record_dead_node(Node* dead) { | |
602 dead_worklist.push(dead); | |
603 } | |
604 | |
605 void PhaseStringOpts::remove_dead_nodes() { | |
606 // Delete any dead nodes to make things clean enough that escape | |
607 // analysis doesn't get unhappy. | |
608 while (dead_worklist.size() > 0) { | |
609 Node* use = dead_worklist.pop(); | |
610 int opc = use->Opcode(); | |
611 switch (opc) { | |
612 case Op_Region: { | |
613 uint i = 1; | |
614 for (i = 1; i < use->req(); i++) { | |
615 if (use->in(i) != C->top()) { | |
616 break; | |
617 } | |
618 } | |
619 if (i >= use->req()) { | |
620 for (SimpleDUIterator i(use); i.has_next(); i.next()) { | |
621 Node* m = i.get(); | |
622 if (m->is_Phi()) { | |
623 dead_worklist.push(m); | |
624 } | |
625 } | |
626 C->gvn_replace_by(use, C->top()); | |
627 } | |
628 break; | |
629 } | |
630 case Op_AddP: | |
631 case Op_CreateEx: { | |
632 // Recurisvely clean up references to CreateEx so EA doesn't | |
633 // get unhappy about the partially collapsed graph. | |
634 for (SimpleDUIterator i(use); i.has_next(); i.next()) { | |
635 Node* m = i.get(); | |
636 if (m->is_AddP()) { | |
637 dead_worklist.push(m); | |
638 } | |
639 } | |
640 C->gvn_replace_by(use, C->top()); | |
641 break; | |
642 } | |
643 case Op_Phi: | |
644 if (use->in(0) == C->top()) { | |
645 C->gvn_replace_by(use, C->top()); | |
646 } | |
647 break; | |
648 } | |
649 } | |
650 } | |
651 | |
652 | |
653 bool StringConcat::validate_control_flow() { | |
654 // We found all the calls and arguments now lets see if it's | |
655 // safe to transform the graph as we would expect. | |
656 | |
657 // Check to see if this resulted in too many uncommon traps previously | |
658 if (Compile::current()->too_many_traps(_begin->jvms()->method(), _begin->jvms()->bci(), | |
659 Deoptimization::Reason_intrinsic)) { | |
660 return false; | |
661 } | |
662 | |
663 // Walk backwards over the control flow from toString to the | |
664 // allocation and make sure all the control flow is ok. This | |
665 // means it's either going to be eliminated once the calls are | |
666 // removed or it can safely be transformed into an uncommon | |
667 // trap. | |
668 | |
669 int null_check_count = 0; | |
670 Unique_Node_List ctrl_path; | |
671 | |
672 assert(_control.contains(_begin), "missing"); | |
673 assert(_control.contains(_end), "missing"); | |
674 | |
675 // Collect the nodes that we know about and will eliminate into ctrl_path | |
676 for (uint i = 0; i < _control.size(); i++) { | |
677 // Push the call and it's control projection | |
678 Node* n = _control.at(i); | |
679 if (n->is_Allocate()) { | |
680 AllocateNode* an = n->as_Allocate(); | |
681 InitializeNode* init = an->initialization(); | |
682 ctrl_path.push(init); | |
683 ctrl_path.push(init->as_Multi()->proj_out(0)); | |
684 } | |
685 if (n->is_Call()) { | |
686 CallNode* cn = n->as_Call(); | |
687 ctrl_path.push(cn); | |
688 ctrl_path.push(cn->proj_out(0)); | |
689 ctrl_path.push(cn->proj_out(0)->unique_out()); | |
690 ctrl_path.push(cn->proj_out(0)->unique_out()->as_Catch()->proj_out(0)); | |
691 } else { | |
692 ShouldNotReachHere(); | |
693 } | |
694 } | |
695 | |
696 // Skip backwards through the control checking for unexpected contro flow | |
697 Node* ptr = _end; | |
698 bool fail = false; | |
699 while (ptr != _begin) { | |
700 if (ptr->is_Call() && ctrl_path.member(ptr)) { | |
701 ptr = ptr->in(0); | |
702 } else if (ptr->is_CatchProj() && ctrl_path.member(ptr)) { | |
703 ptr = ptr->in(0)->in(0)->in(0); | |
704 assert(ctrl_path.member(ptr), "should be a known piece of control"); | |
705 } else if (ptr->is_IfTrue()) { | |
706 IfNode* iff = ptr->in(0)->as_If(); | |
707 BoolNode* b = iff->in(1)->isa_Bool(); | |
708 Node* cmp = b->in(1); | |
709 Node* v1 = cmp->in(1); | |
710 Node* v2 = cmp->in(2); | |
711 Node* otherproj = iff->proj_out(1 - ptr->as_Proj()->_con); | |
712 | |
713 // Null check of the return of append which can simply be eliminated | |
714 if (b->_test._test == BoolTest::ne && | |
715 v2->bottom_type() == TypePtr::NULL_PTR && | |
716 v1->is_Proj() && ctrl_path.member(v1->in(0))) { | |
717 // NULL check of the return value of the append | |
718 null_check_count++; | |
719 if (otherproj->outcnt() == 1) { | |
720 CallStaticJavaNode* call = otherproj->unique_out()->isa_CallStaticJava(); | |
721 if (call != NULL && call->_name != NULL && strcmp(call->_name, "uncommon_trap") == 0) { | |
722 ctrl_path.push(call); | |
723 } | |
724 } | |
725 _control.push(ptr); | |
726 ptr = ptr->in(0)->in(0); | |
727 continue; | |
728 } | |
729 | |
730 // A test which leads to an uncommon trap which should be safe. | |
731 // Later this trap will be converted into a trap that restarts | |
732 // at the beginning. | |
733 if (otherproj->outcnt() == 1) { | |
734 CallStaticJavaNode* call = otherproj->unique_out()->isa_CallStaticJava(); | |
735 if (call != NULL && call->_name != NULL && strcmp(call->_name, "uncommon_trap") == 0) { | |
736 // control flow leads to uct so should be ok | |
737 _uncommon_traps.push(call); | |
738 ctrl_path.push(call); | |
739 ptr = ptr->in(0)->in(0); | |
740 continue; | |
741 } | |
742 } | |
743 | |
744 #ifndef PRODUCT | |
745 // Some unexpected control flow we don't know how to handle. | |
746 if (PrintOptimizeStringConcat) { | |
747 tty->print_cr("failing with unknown test"); | |
748 b->dump(); | |
749 cmp->dump(); | |
750 v1->dump(); | |
751 v2->dump(); | |
752 tty->cr(); | |
753 } | |
754 #endif | |
755 break; | |
756 } else if (ptr->is_Proj() && ptr->in(0)->is_Initialize()) { | |
757 ptr = ptr->in(0)->in(0); | |
758 } else if (ptr->is_Region()) { | |
759 Node* copy = ptr->as_Region()->is_copy(); | |
760 if (copy != NULL) { | |
761 ptr = copy; | |
762 continue; | |
763 } | |
764 if (ptr->req() == 3 && | |
765 ptr->in(1) != NULL && ptr->in(1)->is_Proj() && | |
766 ptr->in(2) != NULL && ptr->in(2)->is_Proj() && | |
767 ptr->in(1)->in(0) == ptr->in(2)->in(0) && | |
768 ptr->in(1)->in(0) != NULL && ptr->in(1)->in(0)->is_If()) { | |
769 // Simple diamond. | |
770 // XXX should check for possibly merging stores. simple data merges are ok. | |
771 ptr = ptr->in(1)->in(0)->in(0); | |
772 continue; | |
773 } | |
774 #ifndef PRODUCT | |
775 if (PrintOptimizeStringConcat) { | |
776 tty->print_cr("fusion would fail for region"); | |
777 _begin->dump(); | |
778 ptr->dump(2); | |
779 } | |
780 #endif | |
781 fail = true; | |
782 break; | |
783 } else { | |
784 // other unknown control | |
785 if (!fail) { | |
786 #ifndef PRODUCT | |
787 if (PrintOptimizeStringConcat) { | |
788 tty->print_cr("fusion would fail for"); | |
789 _begin->dump(); | |
790 } | |
791 #endif | |
792 fail = true; | |
793 } | |
794 #ifndef PRODUCT | |
795 if (PrintOptimizeStringConcat) { | |
796 ptr->dump(); | |
797 } | |
798 #endif | |
799 ptr = ptr->in(0); | |
800 } | |
801 } | |
802 #ifndef PRODUCT | |
803 if (PrintOptimizeStringConcat && fail) { | |
804 tty->cr(); | |
805 } | |
806 #endif | |
807 if (fail) return !fail; | |
808 | |
809 // Validate that all these results produced are contained within | |
810 // this cluster of objects. First collect all the results produced | |
811 // by calls in the region. | |
812 _stringopts->_visited.Clear(); | |
813 Node_List worklist; | |
814 Node* final_result = _end->proj_out(TypeFunc::Parms); | |
815 for (uint i = 0; i < _control.size(); i++) { | |
816 CallNode* cnode = _control.at(i)->isa_Call(); | |
817 if (cnode != NULL) { | |
818 _stringopts->_visited.test_set(cnode->_idx); | |
819 } | |
820 Node* result = cnode != NULL ? cnode->proj_out(TypeFunc::Parms) : NULL; | |
821 if (result != NULL && result != final_result) { | |
822 worklist.push(result); | |
823 } | |
824 } | |
825 | |
826 Node* last_result = NULL; | |
827 while (worklist.size() > 0) { | |
828 Node* result = worklist.pop(); | |
829 if (_stringopts->_visited.test_set(result->_idx)) | |
830 continue; | |
831 for (SimpleDUIterator i(result); i.has_next(); i.next()) { | |
832 Node *use = i.get(); | |
833 if (ctrl_path.member(use)) { | |
834 // already checked this | |
835 continue; | |
836 } | |
837 int opc = use->Opcode(); | |
838 if (opc == Op_CmpP || opc == Op_Node) { | |
839 ctrl_path.push(use); | |
840 continue; | |
841 } | |
842 if (opc == Op_CastPP || opc == Op_CheckCastPP) { | |
843 for (SimpleDUIterator j(use); j.has_next(); j.next()) { | |
844 worklist.push(j.get()); | |
845 } | |
846 worklist.push(use->in(1)); | |
847 ctrl_path.push(use); | |
848 continue; | |
849 } | |
850 #ifndef PRODUCT | |
851 if (PrintOptimizeStringConcat) { | |
852 if (result != last_result) { | |
853 last_result = result; | |
854 tty->print_cr("extra uses for result:"); | |
855 last_result->dump(); | |
856 } | |
857 use->dump(); | |
858 } | |
859 #endif | |
860 fail = true; | |
861 break; | |
862 } | |
863 } | |
864 | |
865 #ifndef PRODUCT | |
866 if (PrintOptimizeStringConcat && !fail) { | |
867 ttyLocker ttyl; | |
868 tty->cr(); | |
869 tty->print("fusion would succeed (%d %d) for ", null_check_count, _uncommon_traps.size()); | |
870 _begin->jvms()->dump_spec(tty); tty->cr(); | |
871 for (int i = 0; i < num_arguments(); i++) { | |
872 argument(i)->dump(); | |
873 } | |
874 _control.dump(); | |
875 tty->cr(); | |
876 } | |
877 #endif | |
878 | |
879 return !fail; | |
880 } | |
881 | |
882 Node* PhaseStringOpts::fetch_static_field(GraphKit& kit, ciField* field) { | |
883 const TypeKlassPtr* klass_type = TypeKlassPtr::make(field->holder()); | |
884 Node* klass_node = __ makecon(klass_type); | |
885 BasicType bt = field->layout_type(); | |
886 ciType* field_klass = field->type(); | |
887 | |
888 const Type *type; | |
889 if( bt == T_OBJECT ) { | |
890 if (!field->type()->is_loaded()) { | |
891 type = TypeInstPtr::BOTTOM; | |
892 } else if (field->is_constant()) { | |
893 // This can happen if the constant oop is non-perm. | |
894 ciObject* con = field->constant_value().as_object(); | |
895 // Do not "join" in the previous type; it doesn't add value, | |
896 // and may yield a vacuous result if the field is of interface type. | |
897 type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); | |
898 assert(type != NULL, "field singleton type must be consistent"); | |
899 } else { | |
900 type = TypeOopPtr::make_from_klass(field_klass->as_klass()); | |
901 } | |
902 } else { | |
903 type = Type::get_const_basic_type(bt); | |
904 } | |
905 | |
906 return kit.make_load(NULL, kit.basic_plus_adr(klass_node, field->offset_in_bytes()), | |
907 type, T_OBJECT, | |
908 C->get_alias_index(klass_type->add_offset(field->offset_in_bytes()))); | |
909 } | |
910 | |
911 Node* PhaseStringOpts::int_stringSize(GraphKit& kit, Node* arg) { | |
912 RegionNode *final_merge = new (C, 3) RegionNode(3); | |
913 kit.gvn().set_type(final_merge, Type::CONTROL); | |
914 Node* final_size = new (C, 3) PhiNode(final_merge, TypeInt::INT); | |
915 kit.gvn().set_type(final_size, TypeInt::INT); | |
916 | |
917 IfNode* iff = kit.create_and_map_if(kit.control(), | |
918 __ Bool(__ CmpI(arg, __ intcon(0x80000000)), BoolTest::ne), | |
919 PROB_FAIR, COUNT_UNKNOWN); | |
920 Node* is_min = __ IfFalse(iff); | |
921 final_merge->init_req(1, is_min); | |
922 final_size->init_req(1, __ intcon(11)); | |
923 | |
924 kit.set_control(__ IfTrue(iff)); | |
925 if (kit.stopped()) { | |
926 final_merge->init_req(2, C->top()); | |
927 final_size->init_req(2, C->top()); | |
928 } else { | |
929 | |
930 // int size = (i < 0) ? stringSize(-i) + 1 : stringSize(i); | |
931 RegionNode *r = new (C, 3) RegionNode(3); | |
932 kit.gvn().set_type(r, Type::CONTROL); | |
933 Node *phi = new (C, 3) PhiNode(r, TypeInt::INT); | |
934 kit.gvn().set_type(phi, TypeInt::INT); | |
935 Node *size = new (C, 3) PhiNode(r, TypeInt::INT); | |
936 kit.gvn().set_type(size, TypeInt::INT); | |
937 Node* chk = __ CmpI(arg, __ intcon(0)); | |
938 Node* p = __ Bool(chk, BoolTest::lt); | |
939 IfNode* iff = kit.create_and_map_if(kit.control(), p, PROB_FAIR, COUNT_UNKNOWN); | |
940 Node* lessthan = __ IfTrue(iff); | |
941 Node* greaterequal = __ IfFalse(iff); | |
942 r->init_req(1, lessthan); | |
943 phi->init_req(1, __ SubI(__ intcon(0), arg)); | |
944 size->init_req(1, __ intcon(1)); | |
945 r->init_req(2, greaterequal); | |
946 phi->init_req(2, arg); | |
947 size->init_req(2, __ intcon(0)); | |
948 kit.set_control(r); | |
949 C->record_for_igvn(r); | |
950 C->record_for_igvn(phi); | |
951 C->record_for_igvn(size); | |
952 | |
953 // for (int i=0; ; i++) | |
954 // if (x <= sizeTable[i]) | |
955 // return i+1; | |
956 RegionNode *loop = new (C, 3) RegionNode(3); | |
957 loop->init_req(1, kit.control()); | |
958 kit.gvn().set_type(loop, Type::CONTROL); | |
959 | |
960 Node *index = new (C, 3) PhiNode(loop, TypeInt::INT); | |
961 index->init_req(1, __ intcon(0)); | |
962 kit.gvn().set_type(index, TypeInt::INT); | |
963 kit.set_control(loop); | |
964 Node* sizeTable = fetch_static_field(kit, size_table_field); | |
965 | |
966 Node* value = kit.load_array_element(NULL, sizeTable, index, TypeAryPtr::INTS); | |
967 C->record_for_igvn(value); | |
968 Node* limit = __ CmpI(phi, value); | |
969 Node* limitb = __ Bool(limit, BoolTest::le); | |
970 IfNode* iff2 = kit.create_and_map_if(kit.control(), limitb, PROB_MIN, COUNT_UNKNOWN); | |
971 Node* lessEqual = __ IfTrue(iff2); | |
972 Node* greater = __ IfFalse(iff2); | |
973 | |
974 loop->init_req(2, greater); | |
975 index->init_req(2, __ AddI(index, __ intcon(1))); | |
976 | |
977 kit.set_control(lessEqual); | |
978 C->record_for_igvn(loop); | |
979 C->record_for_igvn(index); | |
980 | |
981 final_merge->init_req(2, kit.control()); | |
982 final_size->init_req(2, __ AddI(__ AddI(index, size), __ intcon(1))); | |
983 } | |
984 | |
985 kit.set_control(final_merge); | |
986 C->record_for_igvn(final_merge); | |
987 C->record_for_igvn(final_size); | |
988 | |
989 return final_size; | |
990 } | |
991 | |
992 void PhaseStringOpts::int_getChars(GraphKit& kit, Node* arg, Node* char_array, Node* start, Node* end) { | |
993 RegionNode *final_merge = new (C, 4) RegionNode(4); | |
994 kit.gvn().set_type(final_merge, Type::CONTROL); | |
995 Node *final_mem = PhiNode::make(final_merge, kit.memory(char_adr_idx), Type::MEMORY, TypeAryPtr::CHARS); | |
996 kit.gvn().set_type(final_mem, Type::MEMORY); | |
997 | |
998 // need to handle Integer.MIN_VALUE specially because negating doesn't make it positive | |
999 { | |
1000 // i == MIN_VALUE | |
1001 IfNode* iff = kit.create_and_map_if(kit.control(), | |
1002 __ Bool(__ CmpI(arg, __ intcon(0x80000000)), BoolTest::ne), | |
1003 PROB_FAIR, COUNT_UNKNOWN); | |
1004 | |
1005 Node* old_mem = kit.memory(char_adr_idx); | |
1006 | |
1007 kit.set_control(__ IfFalse(iff)); | |
1008 if (kit.stopped()) { | |
1009 // Statically not equal to MIN_VALUE so this path is dead | |
1010 final_merge->init_req(3, kit.control()); | |
1011 } else { | |
1012 copy_string(kit, __ makecon(TypeInstPtr::make(C->env()->the_min_jint_string())), | |
1013 char_array, start); | |
1014 final_merge->init_req(3, kit.control()); | |
1015 final_mem->init_req(3, kit.memory(char_adr_idx)); | |
1016 } | |
1017 | |
1018 kit.set_control(__ IfTrue(iff)); | |
1019 kit.set_memory(old_mem, char_adr_idx); | |
1020 } | |
1021 | |
1022 | |
1023 // Simplified version of Integer.getChars | |
1024 | |
1025 // int q, r; | |
1026 // int charPos = index; | |
1027 Node* charPos = end; | |
1028 | |
1029 // char sign = 0; | |
1030 | |
1031 Node* i = arg; | |
1032 Node* sign = __ intcon(0); | |
1033 | |
1034 // if (i < 0) { | |
1035 // sign = '-'; | |
1036 // i = -i; | |
1037 // } | |
1038 { | |
1039 IfNode* iff = kit.create_and_map_if(kit.control(), | |
1040 __ Bool(__ CmpI(arg, __ intcon(0)), BoolTest::lt), | |
1041 PROB_FAIR, COUNT_UNKNOWN); | |
1042 | |
1043 RegionNode *merge = new (C, 3) RegionNode(3); | |
1044 kit.gvn().set_type(merge, Type::CONTROL); | |
1045 i = new (C, 3) PhiNode(merge, TypeInt::INT); | |
1046 kit.gvn().set_type(i, TypeInt::INT); | |
1047 sign = new (C, 3) PhiNode(merge, TypeInt::INT); | |
1048 kit.gvn().set_type(sign, TypeInt::INT); | |
1049 | |
1050 merge->init_req(1, __ IfTrue(iff)); | |
1051 i->init_req(1, __ SubI(__ intcon(0), arg)); | |
1052 sign->init_req(1, __ intcon('-')); | |
1053 merge->init_req(2, __ IfFalse(iff)); | |
1054 i->init_req(2, arg); | |
1055 sign->init_req(2, __ intcon(0)); | |
1056 | |
1057 kit.set_control(merge); | |
1058 | |
1059 C->record_for_igvn(merge); | |
1060 C->record_for_igvn(i); | |
1061 C->record_for_igvn(sign); | |
1062 } | |
1063 | |
1064 // for (;;) { | |
1065 // q = i / 10; | |
1066 // r = i - ((q << 3) + (q << 1)); // r = i-(q*10) ... | |
1067 // buf [--charPos] = digits [r]; | |
1068 // i = q; | |
1069 // if (i == 0) break; | |
1070 // } | |
1071 | |
1072 { | |
1073 RegionNode *head = new (C, 3) RegionNode(3); | |
1074 head->init_req(1, kit.control()); | |
1075 kit.gvn().set_type(head, Type::CONTROL); | |
1076 Node *i_phi = new (C, 3) PhiNode(head, TypeInt::INT); | |
1077 i_phi->init_req(1, i); | |
1078 kit.gvn().set_type(i_phi, TypeInt::INT); | |
1079 charPos = PhiNode::make(head, charPos); | |
1080 kit.gvn().set_type(charPos, TypeInt::INT); | |
1081 Node *mem = PhiNode::make(head, kit.memory(char_adr_idx), Type::MEMORY, TypeAryPtr::CHARS); | |
1082 kit.gvn().set_type(mem, Type::MEMORY); | |
1083 kit.set_control(head); | |
1084 kit.set_memory(mem, char_adr_idx); | |
1085 | |
1250 | 1086 Node* q = __ DivI(NULL, i_phi, __ intcon(10)); |
1080 | 1087 Node* r = __ SubI(i_phi, __ AddI(__ LShiftI(q, __ intcon(3)), |
1088 __ LShiftI(q, __ intcon(1)))); | |
1089 Node* m1 = __ SubI(charPos, __ intcon(1)); | |
1090 Node* ch = __ AddI(r, __ intcon('0')); | |
1091 | |
1092 Node* st = __ store_to_memory(kit.control(), kit.array_element_address(char_array, m1, T_CHAR), | |
1093 ch, T_CHAR, char_adr_idx); | |
1094 | |
1095 | |
1096 IfNode* iff = kit.create_and_map_if(head, __ Bool(__ CmpI(q, __ intcon(0)), BoolTest::ne), | |
1097 PROB_FAIR, COUNT_UNKNOWN); | |
1098 Node* ne = __ IfTrue(iff); | |
1099 Node* eq = __ IfFalse(iff); | |
1100 | |
1101 head->init_req(2, ne); | |
1102 mem->init_req(2, st); | |
1103 i_phi->init_req(2, q); | |
1104 charPos->init_req(2, m1); | |
1105 | |
1106 charPos = m1; | |
1107 | |
1108 kit.set_control(eq); | |
1109 kit.set_memory(st, char_adr_idx); | |
1110 | |
1111 C->record_for_igvn(head); | |
1112 C->record_for_igvn(mem); | |
1113 C->record_for_igvn(i_phi); | |
1114 C->record_for_igvn(charPos); | |
1115 } | |
1116 | |
1117 { | |
1118 // if (sign != 0) { | |
1119 // buf [--charPos] = sign; | |
1120 // } | |
1121 IfNode* iff = kit.create_and_map_if(kit.control(), | |
1122 __ Bool(__ CmpI(sign, __ intcon(0)), BoolTest::ne), | |
1123 PROB_FAIR, COUNT_UNKNOWN); | |
1124 | |
1125 final_merge->init_req(2, __ IfFalse(iff)); | |
1126 final_mem->init_req(2, kit.memory(char_adr_idx)); | |
1127 | |
1128 kit.set_control(__ IfTrue(iff)); | |
1129 if (kit.stopped()) { | |
1130 final_merge->init_req(1, C->top()); | |
1131 final_mem->init_req(1, C->top()); | |
1132 } else { | |
1133 Node* m1 = __ SubI(charPos, __ intcon(1)); | |
1134 Node* st = __ store_to_memory(kit.control(), kit.array_element_address(char_array, m1, T_CHAR), | |
1135 sign, T_CHAR, char_adr_idx); | |
1136 | |
1137 final_merge->init_req(1, kit.control()); | |
1138 final_mem->init_req(1, st); | |
1139 } | |
1140 | |
1141 kit.set_control(final_merge); | |
1142 kit.set_memory(final_mem, char_adr_idx); | |
1143 | |
1144 C->record_for_igvn(final_merge); | |
1145 C->record_for_igvn(final_mem); | |
1146 } | |
1147 } | |
1148 | |
1149 | |
1150 Node* PhaseStringOpts::copy_string(GraphKit& kit, Node* str, Node* char_array, Node* start) { | |
1151 Node* string = str; | |
1152 Node* offset = kit.make_load(NULL, | |
1153 kit.basic_plus_adr(string, string, java_lang_String::offset_offset_in_bytes()), | |
1154 TypeInt::INT, T_INT, offset_field_idx); | |
1155 Node* count = kit.make_load(NULL, | |
1156 kit.basic_plus_adr(string, string, java_lang_String::count_offset_in_bytes()), | |
1157 TypeInt::INT, T_INT, count_field_idx); | |
1158 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull, | |
1159 TypeAry::make(TypeInt::CHAR,TypeInt::POS), | |
1160 ciTypeArrayKlass::make(T_CHAR), true, 0); | |
1161 Node* value = kit.make_load(NULL, | |
1162 kit.basic_plus_adr(string, string, java_lang_String::value_offset_in_bytes()), | |
1163 value_type, T_OBJECT, value_field_idx); | |
1164 | |
1165 // copy the contents | |
1166 if (offset->is_Con() && count->is_Con() && value->is_Con() && count->get_int() < unroll_string_copy_length) { | |
1167 // For small constant strings just emit individual stores. | |
1168 // A length of 6 seems like a good space/speed tradeof. | |
1169 int c = count->get_int(); | |
1170 int o = offset->get_int(); | |
1171 const TypeOopPtr* t = kit.gvn().type(value)->isa_oopptr(); | |
1172 ciTypeArray* value_array = t->const_oop()->as_type_array(); | |
1173 for (int e = 0; e < c; e++) { | |
1174 __ store_to_memory(kit.control(), kit.array_element_address(char_array, start, T_CHAR), | |
1175 __ intcon(value_array->char_at(o + e)), T_CHAR, char_adr_idx); | |
1176 start = __ AddI(start, __ intcon(1)); | |
1177 } | |
1178 } else { | |
1179 Node* src_ptr = kit.array_element_address(value, offset, T_CHAR); | |
1180 Node* dst_ptr = kit.array_element_address(char_array, start, T_CHAR); | |
1181 Node* c = count; | |
1182 Node* extra = NULL; | |
1183 #ifdef _LP64 | |
1184 c = __ ConvI2L(c); | |
1185 extra = C->top(); | |
1186 #endif | |
1187 Node* call = kit.make_runtime_call(GraphKit::RC_LEAF|GraphKit::RC_NO_FP, | |
1188 OptoRuntime::fast_arraycopy_Type(), | |
1189 CAST_FROM_FN_PTR(address, StubRoutines::jshort_disjoint_arraycopy()), | |
1190 "jshort_disjoint_arraycopy", TypeAryPtr::CHARS, | |
1191 src_ptr, dst_ptr, c, extra); | |
1192 start = __ AddI(start, count); | |
1193 } | |
1194 return start; | |
1195 } | |
1196 | |
1197 | |
1198 void PhaseStringOpts::replace_string_concat(StringConcat* sc) { | |
1199 // Log a little info about the transformation | |
1200 sc->maybe_log_transform(); | |
1201 | |
1202 // pull the JVMState of the allocation into a SafePointNode to serve as | |
1203 // as a shim for the insertion of the new code. | |
1204 JVMState* jvms = sc->begin()->jvms()->clone_shallow(C); | |
1205 uint size = sc->begin()->req(); | |
1206 SafePointNode* map = new (C, size) SafePointNode(size, jvms); | |
1207 | |
1208 // copy the control and memory state from the final call into our | |
1209 // new starting state. This allows any preceeding tests to feed | |
1210 // into the new section of code. | |
1211 for (uint i1 = 0; i1 < TypeFunc::Parms; i1++) { | |
1212 map->init_req(i1, sc->end()->in(i1)); | |
1213 } | |
1214 // blow away old allocation arguments | |
1215 for (uint i1 = TypeFunc::Parms; i1 < jvms->debug_start(); i1++) { | |
1216 map->init_req(i1, C->top()); | |
1217 } | |
1218 // Copy the rest of the inputs for the JVMState | |
1219 for (uint i1 = jvms->debug_start(); i1 < sc->begin()->req(); i1++) { | |
1220 map->init_req(i1, sc->begin()->in(i1)); | |
1221 } | |
1222 // Make sure the memory state is a MergeMem for parsing. | |
1223 if (!map->in(TypeFunc::Memory)->is_MergeMem()) { | |
1224 map->set_req(TypeFunc::Memory, MergeMemNode::make(C, map->in(TypeFunc::Memory))); | |
1225 } | |
1226 | |
1227 jvms->set_map(map); | |
1228 map->ensure_stack(jvms, jvms->method()->max_stack()); | |
1229 | |
1230 | |
1231 // disconnect all the old StringBuilder calls from the graph | |
1232 sc->eliminate_unneeded_control(); | |
1233 | |
1234 // At this point all the old work has been completely removed from | |
1235 // the graph and the saved JVMState exists at the point where the | |
1236 // final toString call used to be. | |
1237 GraphKit kit(jvms); | |
1238 | |
1239 // There may be uncommon traps which are still using the | |
1240 // intermediate states and these need to be rewritten to point at | |
1241 // the JVMState at the beginning of the transformation. | |
1242 sc->convert_uncommon_traps(kit, jvms); | |
1243 | |
1244 // Now insert the logic to compute the size of the string followed | |
1245 // by all the logic to construct array and resulting string. | |
1246 | |
1247 Node* null_string = __ makecon(TypeInstPtr::make(C->env()->the_null_string())); | |
1248 | |
1249 // Create a region for the overflow checks to merge into. | |
1250 int args = MAX2(sc->num_arguments(), 1); | |
1251 RegionNode* overflow = new (C, args) RegionNode(args); | |
1252 kit.gvn().set_type(overflow, Type::CONTROL); | |
1253 | |
1254 // Create a hook node to hold onto the individual sizes since they | |
1255 // are need for the copying phase. | |
1256 Node* string_sizes = new (C, args) Node(args); | |
1257 | |
1258 Node* length = __ intcon(0); | |
1259 for (int argi = 0; argi < sc->num_arguments(); argi++) { | |
1260 Node* arg = sc->argument(argi); | |
1261 switch (sc->mode(argi)) { | |
1262 case StringConcat::IntMode: { | |
1263 Node* string_size = int_stringSize(kit, arg); | |
1264 | |
1265 // accumulate total | |
1266 length = __ AddI(length, string_size); | |
1267 | |
1268 // Cache this value for the use by int_toString | |
1269 string_sizes->init_req(argi, string_size); | |
1270 break; | |
1271 } | |
1272 case StringConcat::StringMode: { | |
1273 const Type* type = kit.gvn().type(arg); | |
1274 if (type == TypePtr::NULL_PTR) { | |
1275 // replace the argument with the null checked version | |
1276 arg = null_string; | |
1277 sc->set_argument(argi, arg); | |
1278 } else if (!type->higher_equal(TypeInstPtr::NOTNULL)) { | |
1279 // s = s != null ? s : "null"; | |
1280 // length = length + (s.count - s.offset); | |
1281 RegionNode *r = new (C, 3) RegionNode(3); | |
1282 kit.gvn().set_type(r, Type::CONTROL); | |
1250 | 1283 Node *phi = new (C, 3) PhiNode(r, type); |
1080 | 1284 kit.gvn().set_type(phi, phi->bottom_type()); |
1285 Node* p = __ Bool(__ CmpP(arg, kit.null()), BoolTest::ne); | |
1286 IfNode* iff = kit.create_and_map_if(kit.control(), p, PROB_MIN, COUNT_UNKNOWN); | |
1287 Node* notnull = __ IfTrue(iff); | |
1288 Node* isnull = __ IfFalse(iff); | |
1250 | 1289 kit.set_control(notnull); // set control for the cast_not_null |
1080 | 1290 r->init_req(1, notnull); |
1250 | 1291 phi->init_req(1, kit.cast_not_null(arg, false)); |
1080 | 1292 r->init_req(2, isnull); |
1293 phi->init_req(2, null_string); | |
1294 kit.set_control(r); | |
1295 C->record_for_igvn(r); | |
1296 C->record_for_igvn(phi); | |
1297 // replace the argument with the null checked version | |
1298 arg = phi; | |
1299 sc->set_argument(argi, arg); | |
1300 } | |
1301 // Node* offset = kit.make_load(NULL, kit.basic_plus_adr(arg, arg, offset_offset), | |
1302 // TypeInt::INT, T_INT, offset_field_idx); | |
1303 Node* count = kit.make_load(NULL, kit.basic_plus_adr(arg, arg, java_lang_String::count_offset_in_bytes()), | |
1304 TypeInt::INT, T_INT, count_field_idx); | |
1305 length = __ AddI(length, count); | |
1306 string_sizes->init_req(argi, NULL); | |
1307 break; | |
1308 } | |
1309 case StringConcat::CharMode: { | |
1310 // one character only | |
1311 length = __ AddI(length, __ intcon(1)); | |
1312 break; | |
1313 } | |
1314 default: | |
1315 ShouldNotReachHere(); | |
1316 } | |
1317 if (argi > 0) { | |
1318 // Check that the sum hasn't overflowed | |
1319 IfNode* iff = kit.create_and_map_if(kit.control(), | |
1320 __ Bool(__ CmpI(length, __ intcon(0)), BoolTest::lt), | |
1321 PROB_MIN, COUNT_UNKNOWN); | |
1322 kit.set_control(__ IfFalse(iff)); | |
1323 overflow->set_req(argi, __ IfTrue(iff)); | |
1324 } | |
1325 } | |
1326 | |
1327 { | |
1328 // Hook | |
1329 PreserveJVMState pjvms(&kit); | |
1330 kit.set_control(overflow); | |
1331 kit.uncommon_trap(Deoptimization::Reason_intrinsic, | |
1332 Deoptimization::Action_make_not_entrant); | |
1333 } | |
1334 | |
1335 // length now contains the number of characters needed for the | |
1336 // char[] so create a new AllocateArray for the char[] | |
1337 Node* char_array = NULL; | |
1338 { | |
1339 PreserveReexecuteState preexecs(&kit); | |
1340 // The original jvms is for an allocation of either a String or | |
1341 // StringBuffer so no stack adjustment is necessary for proper | |
1342 // reexecution. If we deoptimize in the slow path the bytecode | |
1343 // will be reexecuted and the char[] allocation will be thrown away. | |
1344 kit.jvms()->set_should_reexecute(true); | |
1345 char_array = kit.new_array(__ makecon(TypeKlassPtr::make(ciTypeArrayKlass::make(T_CHAR))), | |
1346 length, 1); | |
1347 } | |
1348 | |
1349 // Mark the allocation so that zeroing is skipped since the code | |
1350 // below will overwrite the entire array | |
1351 AllocateArrayNode* char_alloc = AllocateArrayNode::Ideal_array_allocation(char_array, _gvn); | |
1352 char_alloc->maybe_set_complete(_gvn); | |
1353 | |
1354 // Now copy the string representations into the final char[] | |
1355 Node* start = __ intcon(0); | |
1356 for (int argi = 0; argi < sc->num_arguments(); argi++) { | |
1357 Node* arg = sc->argument(argi); | |
1358 switch (sc->mode(argi)) { | |
1359 case StringConcat::IntMode: { | |
1360 Node* end = __ AddI(start, string_sizes->in(argi)); | |
1361 // getChars words backwards so pass the ending point as well as the start | |
1362 int_getChars(kit, arg, char_array, start, end); | |
1363 start = end; | |
1364 break; | |
1365 } | |
1366 case StringConcat::StringMode: { | |
1367 start = copy_string(kit, arg, char_array, start); | |
1368 break; | |
1369 } | |
1370 case StringConcat::CharMode: { | |
1371 __ store_to_memory(kit.control(), kit.array_element_address(char_array, start, T_CHAR), | |
1372 arg, T_CHAR, char_adr_idx); | |
1373 start = __ AddI(start, __ intcon(1)); | |
1374 break; | |
1375 } | |
1376 default: | |
1377 ShouldNotReachHere(); | |
1378 } | |
1379 } | |
1380 | |
1381 // If we're not reusing an existing String allocation then allocate one here. | |
1382 Node* result = sc->string_alloc(); | |
1383 if (result == NULL) { | |
1384 PreserveReexecuteState preexecs(&kit); | |
1385 // The original jvms is for an allocation of either a String or | |
1386 // StringBuffer so no stack adjustment is necessary for proper | |
1387 // reexecution. | |
1388 kit.jvms()->set_should_reexecute(true); | |
1389 result = kit.new_instance(__ makecon(TypeKlassPtr::make(C->env()->String_klass()))); | |
1390 } | |
1391 | |
1392 // Intialize the string | |
1393 kit.store_to_memory(kit.control(), kit.basic_plus_adr(result, java_lang_String::offset_offset_in_bytes()), | |
1394 __ intcon(0), T_INT, offset_field_idx); | |
1395 kit.store_to_memory(kit.control(), kit.basic_plus_adr(result, java_lang_String::count_offset_in_bytes()), | |
1396 length, T_INT, count_field_idx); | |
1397 kit.store_to_memory(kit.control(), kit.basic_plus_adr(result, java_lang_String::value_offset_in_bytes()), | |
1398 char_array, T_OBJECT, value_field_idx); | |
1399 | |
1400 // hook up the outgoing control and result | |
1401 kit.replace_call(sc->end(), result); | |
1402 | |
1403 // Unhook any hook nodes | |
1404 string_sizes->disconnect_inputs(NULL); | |
1405 sc->cleanup(); | |
1406 } |