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src/share/vm/ci/ciTypeFlow.cpp@f90c822e73f8
src/share/vm/ci/ciTypeFlow.cpp
Wed, 27 Apr 2016 01:25:04 +0800
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- aoqi
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- Wed, 27 Apr 2016 01:25:04 +0800
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changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17
1 /*
2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "ci/ciConstant.hpp"
27 #include "ci/ciField.hpp"
28 #include "ci/ciMethod.hpp"
29 #include "ci/ciMethodData.hpp"
30 #include "ci/ciObjArrayKlass.hpp"
31 #include "ci/ciStreams.hpp"
32 #include "ci/ciTypeArrayKlass.hpp"
33 #include "ci/ciTypeFlow.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "interpreter/bytecode.hpp"
36 #include "interpreter/bytecodes.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "runtime/deoptimization.hpp"
39 #include "utilities/growableArray.hpp"
41 // ciTypeFlow::JsrSet
42 //
43 // A JsrSet represents some set of JsrRecords. This class
44 // is used to record a set of all jsr routines which we permit
45 // execution to return (ret) from.
46 //
47 // During abstract interpretation, JsrSets are used to determine
48 // whether two paths which reach a given block are unique, and
49 // should be cloned apart, or are compatible, and should merge
50 // together.
52 // ------------------------------------------------------------------
53 // ciTypeFlow::JsrSet::JsrSet
54 ciTypeFlow::JsrSet::JsrSet(Arena* arena, int default_len) {
55 if (arena != NULL) {
56 // Allocate growable array in Arena.
57 _set = new (arena) GrowableArray<JsrRecord*>(arena, default_len, 0, NULL);
58 } else {
59 // Allocate growable array in current ResourceArea.
60 _set = new GrowableArray<JsrRecord*>(4, 0, NULL, false);
61 }
62 }
64 // ------------------------------------------------------------------
65 // ciTypeFlow::JsrSet::copy_into
66 void ciTypeFlow::JsrSet::copy_into(JsrSet* jsrs) {
67 int len = size();
68 jsrs->_set->clear();
69 for (int i = 0; i < len; i++) {
70 jsrs->_set->append(_set->at(i));
71 }
72 }
74 // ------------------------------------------------------------------
75 // ciTypeFlow::JsrSet::is_compatible_with
76 //
77 // !!!! MISGIVINGS ABOUT THIS... disregard
78 //
79 // Is this JsrSet compatible with some other JsrSet?
80 //
81 // In set-theoretic terms, a JsrSet can be viewed as a partial function
82 // from entry addresses to return addresses. Two JsrSets A and B are
83 // compatible iff
84 //
85 // For any x,
86 // A(x) defined and B(x) defined implies A(x) == B(x)
87 //
88 // Less formally, two JsrSets are compatible when they have identical
89 // return addresses for any entry addresses they share in common.
90 bool ciTypeFlow::JsrSet::is_compatible_with(JsrSet* other) {
91 // Walk through both sets in parallel. If the same entry address
92 // appears in both sets, then the return address must match for
93 // the sets to be compatible.
94 int size1 = size();
95 int size2 = other->size();
97 // Special case. If nothing is on the jsr stack, then there can
98 // be no ret.
99 if (size2 == 0) {
100 return true;
101 } else if (size1 != size2) {
102 return false;
103 } else {
104 for (int i = 0; i < size1; i++) {
105 JsrRecord* record1 = record_at(i);
106 JsrRecord* record2 = other->record_at(i);
107 if (record1->entry_address() != record2->entry_address() ||
108 record1->return_address() != record2->return_address()) {
109 return false;
110 }
111 }
112 return true;
113 }
115 #if 0
116 int pos1 = 0;
117 int pos2 = 0;
118 int size1 = size();
119 int size2 = other->size();
120 while (pos1 < size1 && pos2 < size2) {
121 JsrRecord* record1 = record_at(pos1);
122 JsrRecord* record2 = other->record_at(pos2);
123 int entry1 = record1->entry_address();
124 int entry2 = record2->entry_address();
125 if (entry1 < entry2) {
126 pos1++;
127 } else if (entry1 > entry2) {
128 pos2++;
129 } else {
130 if (record1->return_address() == record2->return_address()) {
131 pos1++;
132 pos2++;
133 } else {
134 // These two JsrSets are incompatible.
135 return false;
136 }
137 }
138 }
139 // The two JsrSets agree.
140 return true;
141 #endif
142 }
144 // ------------------------------------------------------------------
145 // ciTypeFlow::JsrSet::insert_jsr_record
146 //
147 // Insert the given JsrRecord into the JsrSet, maintaining the order
148 // of the set and replacing any element with the same entry address.
149 void ciTypeFlow::JsrSet::insert_jsr_record(JsrRecord* record) {
150 int len = size();
151 int entry = record->entry_address();
152 int pos = 0;
153 for ( ; pos < len; pos++) {
154 JsrRecord* current = record_at(pos);
155 if (entry == current->entry_address()) {
156 // Stomp over this entry.
157 _set->at_put(pos, record);
158 assert(size() == len, "must be same size");
159 return;
160 } else if (entry < current->entry_address()) {
161 break;
162 }
163 }
165 // Insert the record into the list.
166 JsrRecord* swap = record;
167 JsrRecord* temp = NULL;
168 for ( ; pos < len; pos++) {
169 temp = _set->at(pos);
170 _set->at_put(pos, swap);
171 swap = temp;
172 }
173 _set->append(swap);
174 assert(size() == len+1, "must be larger");
175 }
177 // ------------------------------------------------------------------
178 // ciTypeFlow::JsrSet::remove_jsr_record
179 //
180 // Remove the JsrRecord with the given return address from the JsrSet.
181 void ciTypeFlow::JsrSet::remove_jsr_record(int return_address) {
182 int len = size();
183 for (int i = 0; i < len; i++) {
184 if (record_at(i)->return_address() == return_address) {
185 // We have found the proper entry. Remove it from the
186 // JsrSet and exit.
187 for (int j = i+1; j < len ; j++) {
188 _set->at_put(j-1, _set->at(j));
189 }
190 _set->trunc_to(len-1);
191 assert(size() == len-1, "must be smaller");
192 return;
193 }
194 }
195 assert(false, "verify: returning from invalid subroutine");
196 }
198 // ------------------------------------------------------------------
199 // ciTypeFlow::JsrSet::apply_control
200 //
201 // Apply the effect of a control-flow bytecode on the JsrSet. The
202 // only bytecodes that modify the JsrSet are jsr and ret.
203 void ciTypeFlow::JsrSet::apply_control(ciTypeFlow* analyzer,
204 ciBytecodeStream* str,
205 ciTypeFlow::StateVector* state) {
206 Bytecodes::Code code = str->cur_bc();
207 if (code == Bytecodes::_jsr) {
208 JsrRecord* record =
209 analyzer->make_jsr_record(str->get_dest(), str->next_bci());
210 insert_jsr_record(record);
211 } else if (code == Bytecodes::_jsr_w) {
212 JsrRecord* record =
213 analyzer->make_jsr_record(str->get_far_dest(), str->next_bci());
214 insert_jsr_record(record);
215 } else if (code == Bytecodes::_ret) {
216 Cell local = state->local(str->get_index());
217 ciType* return_address = state->type_at(local);
218 assert(return_address->is_return_address(), "verify: wrong type");
219 if (size() == 0) {
220 // Ret-state underflow: Hit a ret w/o any previous jsrs. Bail out.
221 // This can happen when a loop is inside a finally clause (4614060).
222 analyzer->record_failure("OSR in finally clause");
223 return;
224 }
225 remove_jsr_record(return_address->as_return_address()->bci());
226 }
227 }
229 #ifndef PRODUCT
230 // ------------------------------------------------------------------
231 // ciTypeFlow::JsrSet::print_on
232 void ciTypeFlow::JsrSet::print_on(outputStream* st) const {
233 st->print("{ ");
234 int num_elements = size();
235 if (num_elements > 0) {
236 int i = 0;
237 for( ; i < num_elements - 1; i++) {
238 _set->at(i)->print_on(st);
239 st->print(", ");
240 }
241 _set->at(i)->print_on(st);
242 st->print(" ");
243 }
244 st->print("}");
245 }
246 #endif
248 // ciTypeFlow::StateVector
249 //
250 // A StateVector summarizes the type information at some point in
251 // the program.
253 // ------------------------------------------------------------------
254 // ciTypeFlow::StateVector::type_meet
255 //
256 // Meet two types.
257 //
258 // The semi-lattice of types use by this analysis are modeled on those
259 // of the verifier. The lattice is as follows:
260 //
261 // top_type() >= all non-extremal types >= bottom_type
262 // and
263 // Every primitive type is comparable only with itself. The meet of
264 // reference types is determined by their kind: instance class,
265 // interface, or array class. The meet of two types of the same
266 // kind is their least common ancestor. The meet of two types of
267 // different kinds is always java.lang.Object.
268 ciType* ciTypeFlow::StateVector::type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer) {
269 assert(t1 != t2, "checked in caller");
270 if (t1->equals(top_type())) {
271 return t2;
272 } else if (t2->equals(top_type())) {
273 return t1;
274 } else if (t1->is_primitive_type() || t2->is_primitive_type()) {
275 // Special case null_type. null_type meet any reference type T
276 // is T. null_type meet null_type is null_type.
277 if (t1->equals(null_type())) {
278 if (!t2->is_primitive_type() || t2->equals(null_type())) {
279 return t2;
280 }
281 } else if (t2->equals(null_type())) {
282 if (!t1->is_primitive_type()) {
283 return t1;
284 }
285 }
287 // At least one of the two types is a non-top primitive type.
288 // The other type is not equal to it. Fall to bottom.
289 return bottom_type();
290 } else {
291 // Both types are non-top non-primitive types. That is,
292 // both types are either instanceKlasses or arrayKlasses.
293 ciKlass* object_klass = analyzer->env()->Object_klass();
294 ciKlass* k1 = t1->as_klass();
295 ciKlass* k2 = t2->as_klass();
296 if (k1->equals(object_klass) || k2->equals(object_klass)) {
297 return object_klass;
298 } else if (!k1->is_loaded() || !k2->is_loaded()) {
299 // Unloaded classes fall to java.lang.Object at a merge.
300 return object_klass;
301 } else if (k1->is_interface() != k2->is_interface()) {
302 // When an interface meets a non-interface, we get Object;
303 // This is what the verifier does.
304 return object_klass;
305 } else if (k1->is_array_klass() || k2->is_array_klass()) {
306 // When an array meets a non-array, we get Object.
307 // When objArray meets typeArray, we also get Object.
308 // And when typeArray meets different typeArray, we again get Object.
309 // But when objArray meets objArray, we look carefully at element types.
310 if (k1->is_obj_array_klass() && k2->is_obj_array_klass()) {
311 // Meet the element types, then construct the corresponding array type.
312 ciKlass* elem1 = k1->as_obj_array_klass()->element_klass();
313 ciKlass* elem2 = k2->as_obj_array_klass()->element_klass();
314 ciKlass* elem = type_meet_internal(elem1, elem2, analyzer)->as_klass();
315 // Do an easy shortcut if one type is a super of the other.
316 if (elem == elem1) {
317 assert(k1 == ciObjArrayKlass::make(elem), "shortcut is OK");
318 return k1;
319 } else if (elem == elem2) {
320 assert(k2 == ciObjArrayKlass::make(elem), "shortcut is OK");
321 return k2;
322 } else {
323 return ciObjArrayKlass::make(elem);
324 }
325 } else {
326 return object_klass;
327 }
328 } else {
329 // Must be two plain old instance klasses.
330 assert(k1->is_instance_klass(), "previous cases handle non-instances");
331 assert(k2->is_instance_klass(), "previous cases handle non-instances");
332 return k1->least_common_ancestor(k2);
333 }
334 }
335 }
338 // ------------------------------------------------------------------
339 // ciTypeFlow::StateVector::StateVector
340 //
341 // Build a new state vector
342 ciTypeFlow::StateVector::StateVector(ciTypeFlow* analyzer) {
343 _outer = analyzer;
344 _stack_size = -1;
345 _monitor_count = -1;
346 // Allocate the _types array
347 int max_cells = analyzer->max_cells();
348 _types = (ciType**)analyzer->arena()->Amalloc(sizeof(ciType*) * max_cells);
349 for (int i=0; i<max_cells; i++) {
350 _types[i] = top_type();
351 }
352 _trap_bci = -1;
353 _trap_index = 0;
354 _def_locals.clear();
355 }
358 // ------------------------------------------------------------------
359 // ciTypeFlow::get_start_state
360 //
361 // Set this vector to the method entry state.
362 const ciTypeFlow::StateVector* ciTypeFlow::get_start_state() {
363 StateVector* state = new StateVector(this);
364 if (is_osr_flow()) {
365 ciTypeFlow* non_osr_flow = method()->get_flow_analysis();
366 if (non_osr_flow->failing()) {
367 record_failure(non_osr_flow->failure_reason());
368 return NULL;
369 }
370 JsrSet* jsrs = new JsrSet(NULL, 16);
371 Block* non_osr_block = non_osr_flow->existing_block_at(start_bci(), jsrs);
372 if (non_osr_block == NULL) {
373 record_failure("cannot reach OSR point");
374 return NULL;
375 }
376 // load up the non-OSR state at this point
377 non_osr_block->copy_state_into(state);
378 int non_osr_start = non_osr_block->start();
379 if (non_osr_start != start_bci()) {
380 // must flow forward from it
381 if (CITraceTypeFlow) {
382 tty->print_cr(">> Interpreting pre-OSR block %d:", non_osr_start);
383 }
384 Block* block = block_at(non_osr_start, jsrs);
385 assert(block->limit() == start_bci(), "must flow forward to start");
386 flow_block(block, state, jsrs);
387 }
388 return state;
389 // Note: The code below would be an incorrect for an OSR flow,
390 // even if it were possible for an OSR entry point to be at bci zero.
391 }
392 // "Push" the method signature into the first few locals.
393 state->set_stack_size(-max_locals());
394 if (!method()->is_static()) {
395 state->push(method()->holder());
396 assert(state->tos() == state->local(0), "");
397 }
398 for (ciSignatureStream str(method()->signature());
399 !str.at_return_type();
400 str.next()) {
401 state->push_translate(str.type());
402 }
403 // Set the rest of the locals to bottom.
404 Cell cell = state->next_cell(state->tos());
405 state->set_stack_size(0);
406 int limit = state->limit_cell();
407 for (; cell < limit; cell = state->next_cell(cell)) {
408 state->set_type_at(cell, state->bottom_type());
409 }
410 // Lock an object, if necessary.
411 state->set_monitor_count(method()->is_synchronized() ? 1 : 0);
412 return state;
413 }
415 // ------------------------------------------------------------------
416 // ciTypeFlow::StateVector::copy_into
417 //
418 // Copy our value into some other StateVector
419 void ciTypeFlow::StateVector::copy_into(ciTypeFlow::StateVector* copy)
420 const {
421 copy->set_stack_size(stack_size());
422 copy->set_monitor_count(monitor_count());
423 Cell limit = limit_cell();
424 for (Cell c = start_cell(); c < limit; c = next_cell(c)) {
425 copy->set_type_at(c, type_at(c));
426 }
427 }
429 // ------------------------------------------------------------------
430 // ciTypeFlow::StateVector::meet
431 //
432 // Meets this StateVector with another, destructively modifying this
433 // one. Returns true if any modification takes place.
434 bool ciTypeFlow::StateVector::meet(const ciTypeFlow::StateVector* incoming) {
435 if (monitor_count() == -1) {
436 set_monitor_count(incoming->monitor_count());
437 }
438 assert(monitor_count() == incoming->monitor_count(), "monitors must match");
440 if (stack_size() == -1) {
441 set_stack_size(incoming->stack_size());
442 Cell limit = limit_cell();
443 #ifdef ASSERT
444 { for (Cell c = start_cell(); c < limit; c = next_cell(c)) {
445 assert(type_at(c) == top_type(), "");
446 } }
447 #endif
448 // Make a simple copy of the incoming state.
449 for (Cell c = start_cell(); c < limit; c = next_cell(c)) {
450 set_type_at(c, incoming->type_at(c));
451 }
452 return true; // it is always different the first time
453 }
454 #ifdef ASSERT
455 if (stack_size() != incoming->stack_size()) {
456 _outer->method()->print_codes();
457 tty->print_cr("!!!! Stack size conflict");
458 tty->print_cr("Current state:");
459 print_on(tty);
460 tty->print_cr("Incoming state:");
461 ((StateVector*)incoming)->print_on(tty);
462 }
463 #endif
464 assert(stack_size() == incoming->stack_size(), "sanity");
466 bool different = false;
467 Cell limit = limit_cell();
468 for (Cell c = start_cell(); c < limit; c = next_cell(c)) {
469 ciType* t1 = type_at(c);
470 ciType* t2 = incoming->type_at(c);
471 if (!t1->equals(t2)) {
472 ciType* new_type = type_meet(t1, t2);
473 if (!t1->equals(new_type)) {
474 set_type_at(c, new_type);
475 different = true;
476 }
477 }
478 }
479 return different;
480 }
482 // ------------------------------------------------------------------
483 // ciTypeFlow::StateVector::meet_exception
484 //
485 // Meets this StateVector with another, destructively modifying this
486 // one. The incoming state is coming via an exception. Returns true
487 // if any modification takes place.
488 bool ciTypeFlow::StateVector::meet_exception(ciInstanceKlass* exc,
489 const ciTypeFlow::StateVector* incoming) {
490 if (monitor_count() == -1) {
491 set_monitor_count(incoming->monitor_count());
492 }
493 assert(monitor_count() == incoming->monitor_count(), "monitors must match");
495 if (stack_size() == -1) {
496 set_stack_size(1);
497 }
499 assert(stack_size() == 1, "must have one-element stack");
501 bool different = false;
503 // Meet locals from incoming array.
504 Cell limit = local(_outer->max_locals()-1);
505 for (Cell c = start_cell(); c <= limit; c = next_cell(c)) {
506 ciType* t1 = type_at(c);
507 ciType* t2 = incoming->type_at(c);
508 if (!t1->equals(t2)) {
509 ciType* new_type = type_meet(t1, t2);
510 if (!t1->equals(new_type)) {
511 set_type_at(c, new_type);
512 different = true;
513 }
514 }
515 }
517 // Handle stack separately. When an exception occurs, the
518 // only stack entry is the exception instance.
519 ciType* tos_type = type_at_tos();
520 if (!tos_type->equals(exc)) {
521 ciType* new_type = type_meet(tos_type, exc);
522 if (!tos_type->equals(new_type)) {
523 set_type_at_tos(new_type);
524 different = true;
525 }
526 }
528 return different;
529 }
531 // ------------------------------------------------------------------
532 // ciTypeFlow::StateVector::push_translate
533 void ciTypeFlow::StateVector::push_translate(ciType* type) {
534 BasicType basic_type = type->basic_type();
535 if (basic_type == T_BOOLEAN || basic_type == T_CHAR ||
536 basic_type == T_BYTE || basic_type == T_SHORT) {
537 push_int();
538 } else {
539 push(type);
540 if (type->is_two_word()) {
541 push(half_type(type));
542 }
543 }
544 }
546 // ------------------------------------------------------------------
547 // ciTypeFlow::StateVector::do_aaload
548 void ciTypeFlow::StateVector::do_aaload(ciBytecodeStream* str) {
549 pop_int();
550 ciObjArrayKlass* array_klass = pop_objArray();
551 if (array_klass == NULL) {
552 // Did aaload on a null reference; push a null and ignore the exception.
553 // This instruction will never continue normally. All we have to do
554 // is report a value that will meet correctly with any downstream
555 // reference types on paths that will truly be executed. This null type
556 // meets with any reference type to yield that same reference type.
557 // (The compiler will generate an unconditional exception here.)
558 push(null_type());
559 return;
560 }
561 if (!array_klass->is_loaded()) {
562 // Only fails for some -Xcomp runs
563 trap(str, array_klass,
564 Deoptimization::make_trap_request
565 (Deoptimization::Reason_unloaded,
566 Deoptimization::Action_reinterpret));
567 return;
568 }
569 ciKlass* element_klass = array_klass->element_klass();
570 if (!element_klass->is_loaded() && element_klass->is_instance_klass()) {
571 Untested("unloaded array element class in ciTypeFlow");
572 trap(str, element_klass,
573 Deoptimization::make_trap_request
574 (Deoptimization::Reason_unloaded,
575 Deoptimization::Action_reinterpret));
576 } else {
577 push_object(element_klass);
578 }
579 }
582 // ------------------------------------------------------------------
583 // ciTypeFlow::StateVector::do_checkcast
584 void ciTypeFlow::StateVector::do_checkcast(ciBytecodeStream* str) {
585 bool will_link;
586 ciKlass* klass = str->get_klass(will_link);
587 if (!will_link) {
588 // VM's interpreter will not load 'klass' if object is NULL.
589 // Type flow after this block may still be needed in two situations:
590 // 1) C2 uses do_null_assert() and continues compilation for later blocks
591 // 2) C2 does an OSR compile in a later block (see bug 4778368).
592 pop_object();
593 do_null_assert(klass);
594 } else {
595 pop_object();
596 push_object(klass);
597 }
598 }
600 // ------------------------------------------------------------------
601 // ciTypeFlow::StateVector::do_getfield
602 void ciTypeFlow::StateVector::do_getfield(ciBytecodeStream* str) {
603 // could add assert here for type of object.
604 pop_object();
605 do_getstatic(str);
606 }
608 // ------------------------------------------------------------------
609 // ciTypeFlow::StateVector::do_getstatic
610 void ciTypeFlow::StateVector::do_getstatic(ciBytecodeStream* str) {
611 bool will_link;
612 ciField* field = str->get_field(will_link);
613 if (!will_link) {
614 trap(str, field->holder(), str->get_field_holder_index());
615 } else {
616 ciType* field_type = field->type();
617 if (!field_type->is_loaded()) {
618 // Normally, we need the field's type to be loaded if we are to
619 // do anything interesting with its value.
620 // We used to do this: trap(str, str->get_field_signature_index());
621 //
622 // There is one good reason not to trap here. Execution can
623 // get past this "getfield" or "getstatic" if the value of
624 // the field is null. As long as the value is null, the class
625 // does not need to be loaded! The compiler must assume that
626 // the value of the unloaded class reference is null; if the code
627 // ever sees a non-null value, loading has occurred.
628 //
629 // This actually happens often enough to be annoying. If the
630 // compiler throws an uncommon trap at this bytecode, you can
631 // get an endless loop of recompilations, when all the code
632 // needs to do is load a series of null values. Also, a trap
633 // here can make an OSR entry point unreachable, triggering the
634 // assert on non_osr_block in ciTypeFlow::get_start_state.
635 // (See bug 4379915.)
636 do_null_assert(field_type->as_klass());
637 } else {
638 push_translate(field_type);
639 }
640 }
641 }
643 // ------------------------------------------------------------------
644 // ciTypeFlow::StateVector::do_invoke
645 void ciTypeFlow::StateVector::do_invoke(ciBytecodeStream* str,
646 bool has_receiver) {
647 bool will_link;
648 ciSignature* declared_signature = NULL;
649 ciMethod* callee = str->get_method(will_link, &declared_signature);
650 assert(declared_signature != NULL, "cannot be null");
651 if (!will_link) {
652 // We weren't able to find the method.
653 if (str->cur_bc() == Bytecodes::_invokedynamic) {
654 trap(str, NULL,
655 Deoptimization::make_trap_request
656 (Deoptimization::Reason_uninitialized,
657 Deoptimization::Action_reinterpret));
658 } else {
659 ciKlass* unloaded_holder = callee->holder();
660 trap(str, unloaded_holder, str->get_method_holder_index());
661 }
662 } else {
663 // We are using the declared signature here because it might be
664 // different from the callee signature (Cf. invokedynamic and
665 // invokehandle).
666 ciSignatureStream sigstr(declared_signature);
667 const int arg_size = declared_signature->size();
668 const int stack_base = stack_size() - arg_size;
669 int i = 0;
670 for( ; !sigstr.at_return_type(); sigstr.next()) {
671 ciType* type = sigstr.type();
672 ciType* stack_type = type_at(stack(stack_base + i++));
673 // Do I want to check this type?
674 // assert(stack_type->is_subtype_of(type), "bad type for field value");
675 if (type->is_two_word()) {
676 ciType* stack_type2 = type_at(stack(stack_base + i++));
677 assert(stack_type2->equals(half_type(type)), "must be 2nd half");
678 }
679 }
680 assert(arg_size == i, "must match");
681 for (int j = 0; j < arg_size; j++) {
682 pop();
683 }
684 if (has_receiver) {
685 // Check this?
686 pop_object();
687 }
688 assert(!sigstr.is_done(), "must have return type");
689 ciType* return_type = sigstr.type();
690 if (!return_type->is_void()) {
691 if (!return_type->is_loaded()) {
692 // As in do_getstatic(), generally speaking, we need the return type to
693 // be loaded if we are to do anything interesting with its value.
694 // We used to do this: trap(str, str->get_method_signature_index());
695 //
696 // We do not trap here since execution can get past this invoke if
697 // the return value is null. As long as the value is null, the class
698 // does not need to be loaded! The compiler must assume that
699 // the value of the unloaded class reference is null; if the code
700 // ever sees a non-null value, loading has occurred.
701 //
702 // See do_getstatic() for similar explanation, as well as bug 4684993.
703 do_null_assert(return_type->as_klass());
704 } else {
705 push_translate(return_type);
706 }
707 }
708 }
709 }
711 // ------------------------------------------------------------------
712 // ciTypeFlow::StateVector::do_jsr
713 void ciTypeFlow::StateVector::do_jsr(ciBytecodeStream* str) {
714 push(ciReturnAddress::make(str->next_bci()));
715 }
717 // ------------------------------------------------------------------
718 // ciTypeFlow::StateVector::do_ldc
719 void ciTypeFlow::StateVector::do_ldc(ciBytecodeStream* str) {
720 ciConstant con = str->get_constant();
721 BasicType basic_type = con.basic_type();
722 if (basic_type == T_ILLEGAL) {
723 // OutOfMemoryError in the CI while loading constant
724 push_null();
725 outer()->record_failure("ldc did not link");
726 return;
727 }
728 if (basic_type == T_OBJECT || basic_type == T_ARRAY) {
729 ciObject* obj = con.as_object();
730 if (obj->is_null_object()) {
731 push_null();
732 } else {
733 assert(obj->is_instance(), "must be java_mirror of klass");
734 push_object(obj->klass());
735 }
736 } else {
737 push_translate(ciType::make(basic_type));
738 }
739 }
741 // ------------------------------------------------------------------
742 // ciTypeFlow::StateVector::do_multianewarray
743 void ciTypeFlow::StateVector::do_multianewarray(ciBytecodeStream* str) {
744 int dimensions = str->get_dimensions();
745 bool will_link;
746 ciArrayKlass* array_klass = str->get_klass(will_link)->as_array_klass();
747 if (!will_link) {
748 trap(str, array_klass, str->get_klass_index());
749 } else {
750 for (int i = 0; i < dimensions; i++) {
751 pop_int();
752 }
753 push_object(array_klass);
754 }
755 }
757 // ------------------------------------------------------------------
758 // ciTypeFlow::StateVector::do_new
759 void ciTypeFlow::StateVector::do_new(ciBytecodeStream* str) {
760 bool will_link;
761 ciKlass* klass = str->get_klass(will_link);
762 if (!will_link || str->is_unresolved_klass()) {
763 trap(str, klass, str->get_klass_index());
764 } else {
765 push_object(klass);
766 }
767 }
769 // ------------------------------------------------------------------
770 // ciTypeFlow::StateVector::do_newarray
771 void ciTypeFlow::StateVector::do_newarray(ciBytecodeStream* str) {
772 pop_int();
773 ciKlass* klass = ciTypeArrayKlass::make((BasicType)str->get_index());
774 push_object(klass);
775 }
777 // ------------------------------------------------------------------
778 // ciTypeFlow::StateVector::do_putfield
779 void ciTypeFlow::StateVector::do_putfield(ciBytecodeStream* str) {
780 do_putstatic(str);
781 if (_trap_bci != -1) return; // unloaded field holder, etc.
782 // could add assert here for type of object.
783 pop_object();
784 }
786 // ------------------------------------------------------------------
787 // ciTypeFlow::StateVector::do_putstatic
788 void ciTypeFlow::StateVector::do_putstatic(ciBytecodeStream* str) {
789 bool will_link;
790 ciField* field = str->get_field(will_link);
791 if (!will_link) {
792 trap(str, field->holder(), str->get_field_holder_index());
793 } else {
794 ciType* field_type = field->type();
795 ciType* type = pop_value();
796 // Do I want to check this type?
797 // assert(type->is_subtype_of(field_type), "bad type for field value");
798 if (field_type->is_two_word()) {
799 ciType* type2 = pop_value();
800 assert(type2->is_two_word(), "must be 2nd half");
801 assert(type == half_type(type2), "must be 2nd half");
802 }
803 }
804 }
806 // ------------------------------------------------------------------
807 // ciTypeFlow::StateVector::do_ret
808 void ciTypeFlow::StateVector::do_ret(ciBytecodeStream* str) {
809 Cell index = local(str->get_index());
811 ciType* address = type_at(index);
812 assert(address->is_return_address(), "bad return address");
813 set_type_at(index, bottom_type());
814 }
816 // ------------------------------------------------------------------
817 // ciTypeFlow::StateVector::trap
818 //
819 // Stop interpretation of this path with a trap.
820 void ciTypeFlow::StateVector::trap(ciBytecodeStream* str, ciKlass* klass, int index) {
821 _trap_bci = str->cur_bci();
822 _trap_index = index;
824 // Log information about this trap:
825 CompileLog* log = outer()->env()->log();
826 if (log != NULL) {
827 int mid = log->identify(outer()->method());
828 int kid = (klass == NULL)? -1: log->identify(klass);
829 log->begin_elem("uncommon_trap method='%d' bci='%d'", mid, str->cur_bci());
830 char buf[100];
831 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf),
832 index));
833 if (kid >= 0)
834 log->print(" klass='%d'", kid);
835 log->end_elem();
836 }
837 }
839 // ------------------------------------------------------------------
840 // ciTypeFlow::StateVector::do_null_assert
841 // Corresponds to graphKit::do_null_assert.
842 void ciTypeFlow::StateVector::do_null_assert(ciKlass* unloaded_klass) {
843 if (unloaded_klass->is_loaded()) {
844 // We failed to link, but we can still compute with this class,
845 // since it is loaded somewhere. The compiler will uncommon_trap
846 // if the object is not null, but the typeflow pass can not assume
847 // that the object will be null, otherwise it may incorrectly tell
848 // the parser that an object is known to be null. 4761344, 4807707
849 push_object(unloaded_klass);
850 } else {
851 // The class is not loaded anywhere. It is safe to model the
852 // null in the typestates, because we can compile in a null check
853 // which will deoptimize us if someone manages to load the
854 // class later.
855 push_null();
856 }
857 }
860 // ------------------------------------------------------------------
861 // ciTypeFlow::StateVector::apply_one_bytecode
862 //
863 // Apply the effect of one bytecode to this StateVector
864 bool ciTypeFlow::StateVector::apply_one_bytecode(ciBytecodeStream* str) {
865 _trap_bci = -1;
866 _trap_index = 0;
868 if (CITraceTypeFlow) {
869 tty->print_cr(">> Interpreting bytecode %d:%s", str->cur_bci(),
870 Bytecodes::name(str->cur_bc()));
871 }
873 switch(str->cur_bc()) {
874 case Bytecodes::_aaload: do_aaload(str); break;
876 case Bytecodes::_aastore:
877 {
878 pop_object();
879 pop_int();
880 pop_objArray();
881 break;
882 }
883 case Bytecodes::_aconst_null:
884 {
885 push_null();
886 break;
887 }
888 case Bytecodes::_aload: load_local_object(str->get_index()); break;
889 case Bytecodes::_aload_0: load_local_object(0); break;
890 case Bytecodes::_aload_1: load_local_object(1); break;
891 case Bytecodes::_aload_2: load_local_object(2); break;
892 case Bytecodes::_aload_3: load_local_object(3); break;
894 case Bytecodes::_anewarray:
895 {
896 pop_int();
897 bool will_link;
898 ciKlass* element_klass = str->get_klass(will_link);
899 if (!will_link) {
900 trap(str, element_klass, str->get_klass_index());
901 } else {
902 push_object(ciObjArrayKlass::make(element_klass));
903 }
904 break;
905 }
906 case Bytecodes::_areturn:
907 case Bytecodes::_ifnonnull:
908 case Bytecodes::_ifnull:
909 {
910 pop_object();
911 break;
912 }
913 case Bytecodes::_monitorenter:
914 {
915 pop_object();
916 set_monitor_count(monitor_count() + 1);
917 break;
918 }
919 case Bytecodes::_monitorexit:
920 {
921 pop_object();
922 assert(monitor_count() > 0, "must be a monitor to exit from");
923 set_monitor_count(monitor_count() - 1);
924 break;
925 }
926 case Bytecodes::_arraylength:
927 {
928 pop_array();
929 push_int();
930 break;
931 }
932 case Bytecodes::_astore: store_local_object(str->get_index()); break;
933 case Bytecodes::_astore_0: store_local_object(0); break;
934 case Bytecodes::_astore_1: store_local_object(1); break;
935 case Bytecodes::_astore_2: store_local_object(2); break;
936 case Bytecodes::_astore_3: store_local_object(3); break;
938 case Bytecodes::_athrow:
939 {
940 NEEDS_CLEANUP;
941 pop_object();
942 break;
943 }
944 case Bytecodes::_baload:
945 case Bytecodes::_caload:
946 case Bytecodes::_iaload:
947 case Bytecodes::_saload:
948 {
949 pop_int();
950 ciTypeArrayKlass* array_klass = pop_typeArray();
951 // Put assert here for right type?
952 push_int();
953 break;
954 }
955 case Bytecodes::_bastore:
956 case Bytecodes::_castore:
957 case Bytecodes::_iastore:
958 case Bytecodes::_sastore:
959 {
960 pop_int();
961 pop_int();
962 pop_typeArray();
963 // assert here?
964 break;
965 }
966 case Bytecodes::_bipush:
967 case Bytecodes::_iconst_m1:
968 case Bytecodes::_iconst_0:
969 case Bytecodes::_iconst_1:
970 case Bytecodes::_iconst_2:
971 case Bytecodes::_iconst_3:
972 case Bytecodes::_iconst_4:
973 case Bytecodes::_iconst_5:
974 case Bytecodes::_sipush:
975 {
976 push_int();
977 break;
978 }
979 case Bytecodes::_checkcast: do_checkcast(str); break;
981 case Bytecodes::_d2f:
982 {
983 pop_double();
984 push_float();
985 break;
986 }
987 case Bytecodes::_d2i:
988 {
989 pop_double();
990 push_int();
991 break;
992 }
993 case Bytecodes::_d2l:
994 {
995 pop_double();
996 push_long();
997 break;
998 }
999 case Bytecodes::_dadd:
1000 case Bytecodes::_ddiv:
1001 case Bytecodes::_dmul:
1002 case Bytecodes::_drem:
1003 case Bytecodes::_dsub:
1004 {
1005 pop_double();
1006 pop_double();
1007 push_double();
1008 break;
1009 }
1010 case Bytecodes::_daload:
1011 {
1012 pop_int();
1013 ciTypeArrayKlass* array_klass = pop_typeArray();
1014 // Put assert here for right type?
1015 push_double();
1016 break;
1017 }
1018 case Bytecodes::_dastore:
1019 {
1020 pop_double();
1021 pop_int();
1022 pop_typeArray();
1023 // assert here?
1024 break;
1025 }
1026 case Bytecodes::_dcmpg:
1027 case Bytecodes::_dcmpl:
1028 {
1029 pop_double();
1030 pop_double();
1031 push_int();
1032 break;
1033 }
1034 case Bytecodes::_dconst_0:
1035 case Bytecodes::_dconst_1:
1036 {
1037 push_double();
1038 break;
1039 }
1040 case Bytecodes::_dload: load_local_double(str->get_index()); break;
1041 case Bytecodes::_dload_0: load_local_double(0); break;
1042 case Bytecodes::_dload_1: load_local_double(1); break;
1043 case Bytecodes::_dload_2: load_local_double(2); break;
1044 case Bytecodes::_dload_3: load_local_double(3); break;
1046 case Bytecodes::_dneg:
1047 {
1048 pop_double();
1049 push_double();
1050 break;
1051 }
1052 case Bytecodes::_dreturn:
1053 {
1054 pop_double();
1055 break;
1056 }
1057 case Bytecodes::_dstore: store_local_double(str->get_index()); break;
1058 case Bytecodes::_dstore_0: store_local_double(0); break;
1059 case Bytecodes::_dstore_1: store_local_double(1); break;
1060 case Bytecodes::_dstore_2: store_local_double(2); break;
1061 case Bytecodes::_dstore_3: store_local_double(3); break;
1063 case Bytecodes::_dup:
1064 {
1065 push(type_at_tos());
1066 break;
1067 }
1068 case Bytecodes::_dup_x1:
1069 {
1070 ciType* value1 = pop_value();
1071 ciType* value2 = pop_value();
1072 push(value1);
1073 push(value2);
1074 push(value1);
1075 break;
1076 }
1077 case Bytecodes::_dup_x2:
1078 {
1079 ciType* value1 = pop_value();
1080 ciType* value2 = pop_value();
1081 ciType* value3 = pop_value();
1082 push(value1);
1083 push(value3);
1084 push(value2);
1085 push(value1);
1086 break;
1087 }
1088 case Bytecodes::_dup2:
1089 {
1090 ciType* value1 = pop_value();
1091 ciType* value2 = pop_value();
1092 push(value2);
1093 push(value1);
1094 push(value2);
1095 push(value1);
1096 break;
1097 }
1098 case Bytecodes::_dup2_x1:
1099 {
1100 ciType* value1 = pop_value();
1101 ciType* value2 = pop_value();
1102 ciType* value3 = pop_value();
1103 push(value2);
1104 push(value1);
1105 push(value3);
1106 push(value2);
1107 push(value1);
1108 break;
1109 }
1110 case Bytecodes::_dup2_x2:
1111 {
1112 ciType* value1 = pop_value();
1113 ciType* value2 = pop_value();
1114 ciType* value3 = pop_value();
1115 ciType* value4 = pop_value();
1116 push(value2);
1117 push(value1);
1118 push(value4);
1119 push(value3);
1120 push(value2);
1121 push(value1);
1122 break;
1123 }
1124 case Bytecodes::_f2d:
1125 {
1126 pop_float();
1127 push_double();
1128 break;
1129 }
1130 case Bytecodes::_f2i:
1131 {
1132 pop_float();
1133 push_int();
1134 break;
1135 }
1136 case Bytecodes::_f2l:
1137 {
1138 pop_float();
1139 push_long();
1140 break;
1141 }
1142 case Bytecodes::_fadd:
1143 case Bytecodes::_fdiv:
1144 case Bytecodes::_fmul:
1145 case Bytecodes::_frem:
1146 case Bytecodes::_fsub:
1147 {
1148 pop_float();
1149 pop_float();
1150 push_float();
1151 break;
1152 }
1153 case Bytecodes::_faload:
1154 {
1155 pop_int();
1156 ciTypeArrayKlass* array_klass = pop_typeArray();
1157 // Put assert here.
1158 push_float();
1159 break;
1160 }
1161 case Bytecodes::_fastore:
1162 {
1163 pop_float();
1164 pop_int();
1165 ciTypeArrayKlass* array_klass = pop_typeArray();
1166 // Put assert here.
1167 break;
1168 }
1169 case Bytecodes::_fcmpg:
1170 case Bytecodes::_fcmpl:
1171 {
1172 pop_float();
1173 pop_float();
1174 push_int();
1175 break;
1176 }
1177 case Bytecodes::_fconst_0:
1178 case Bytecodes::_fconst_1:
1179 case Bytecodes::_fconst_2:
1180 {
1181 push_float();
1182 break;
1183 }
1184 case Bytecodes::_fload: load_local_float(str->get_index()); break;
1185 case Bytecodes::_fload_0: load_local_float(0); break;
1186 case Bytecodes::_fload_1: load_local_float(1); break;
1187 case Bytecodes::_fload_2: load_local_float(2); break;
1188 case Bytecodes::_fload_3: load_local_float(3); break;
1190 case Bytecodes::_fneg:
1191 {
1192 pop_float();
1193 push_float();
1194 break;
1195 }
1196 case Bytecodes::_freturn:
1197 {
1198 pop_float();
1199 break;
1200 }
1201 case Bytecodes::_fstore: store_local_float(str->get_index()); break;
1202 case Bytecodes::_fstore_0: store_local_float(0); break;
1203 case Bytecodes::_fstore_1: store_local_float(1); break;
1204 case Bytecodes::_fstore_2: store_local_float(2); break;
1205 case Bytecodes::_fstore_3: store_local_float(3); break;
1207 case Bytecodes::_getfield: do_getfield(str); break;
1208 case Bytecodes::_getstatic: do_getstatic(str); break;
1210 case Bytecodes::_goto:
1211 case Bytecodes::_goto_w:
1212 case Bytecodes::_nop:
1213 case Bytecodes::_return:
1214 {
1215 // do nothing.
1216 break;
1217 }
1218 case Bytecodes::_i2b:
1219 case Bytecodes::_i2c:
1220 case Bytecodes::_i2s:
1221 case Bytecodes::_ineg:
1222 {
1223 pop_int();
1224 push_int();
1225 break;
1226 }
1227 case Bytecodes::_i2d:
1228 {
1229 pop_int();
1230 push_double();
1231 break;
1232 }
1233 case Bytecodes::_i2f:
1234 {
1235 pop_int();
1236 push_float();
1237 break;
1238 }
1239 case Bytecodes::_i2l:
1240 {
1241 pop_int();
1242 push_long();
1243 break;
1244 }
1245 case Bytecodes::_iadd:
1246 case Bytecodes::_iand:
1247 case Bytecodes::_idiv:
1248 case Bytecodes::_imul:
1249 case Bytecodes::_ior:
1250 case Bytecodes::_irem:
1251 case Bytecodes::_ishl:
1252 case Bytecodes::_ishr:
1253 case Bytecodes::_isub:
1254 case Bytecodes::_iushr:
1255 case Bytecodes::_ixor:
1256 {
1257 pop_int();
1258 pop_int();
1259 push_int();
1260 break;
1261 }
1262 case Bytecodes::_if_acmpeq:
1263 case Bytecodes::_if_acmpne:
1264 {
1265 pop_object();
1266 pop_object();
1267 break;
1268 }
1269 case Bytecodes::_if_icmpeq:
1270 case Bytecodes::_if_icmpge:
1271 case Bytecodes::_if_icmpgt:
1272 case Bytecodes::_if_icmple:
1273 case Bytecodes::_if_icmplt:
1274 case Bytecodes::_if_icmpne:
1275 {
1276 pop_int();
1277 pop_int();
1278 break;
1279 }
1280 case Bytecodes::_ifeq:
1281 case Bytecodes::_ifle:
1282 case Bytecodes::_iflt:
1283 case Bytecodes::_ifge:
1284 case Bytecodes::_ifgt:
1285 case Bytecodes::_ifne:
1286 case Bytecodes::_ireturn:
1287 case Bytecodes::_lookupswitch:
1288 case Bytecodes::_tableswitch:
1289 {
1290 pop_int();
1291 break;
1292 }
1293 case Bytecodes::_iinc:
1294 {
1295 int lnum = str->get_index();
1296 check_int(local(lnum));
1297 store_to_local(lnum);
1298 break;
1299 }
1300 case Bytecodes::_iload: load_local_int(str->get_index()); break;
1301 case Bytecodes::_iload_0: load_local_int(0); break;
1302 case Bytecodes::_iload_1: load_local_int(1); break;
1303 case Bytecodes::_iload_2: load_local_int(2); break;
1304 case Bytecodes::_iload_3: load_local_int(3); break;
1306 case Bytecodes::_instanceof:
1307 {
1308 // Check for uncommon trap:
1309 do_checkcast(str);
1310 pop_object();
1311 push_int();
1312 break;
1313 }
1314 case Bytecodes::_invokeinterface: do_invoke(str, true); break;
1315 case Bytecodes::_invokespecial: do_invoke(str, true); break;
1316 case Bytecodes::_invokestatic: do_invoke(str, false); break;
1317 case Bytecodes::_invokevirtual: do_invoke(str, true); break;
1318 case Bytecodes::_invokedynamic: do_invoke(str, false); break;
1320 case Bytecodes::_istore: store_local_int(str->get_index()); break;
1321 case Bytecodes::_istore_0: store_local_int(0); break;
1322 case Bytecodes::_istore_1: store_local_int(1); break;
1323 case Bytecodes::_istore_2: store_local_int(2); break;
1324 case Bytecodes::_istore_3: store_local_int(3); break;
1326 case Bytecodes::_jsr:
1327 case Bytecodes::_jsr_w: do_jsr(str); break;
1329 case Bytecodes::_l2d:
1330 {
1331 pop_long();
1332 push_double();
1333 break;
1334 }
1335 case Bytecodes::_l2f:
1336 {
1337 pop_long();
1338 push_float();
1339 break;
1340 }
1341 case Bytecodes::_l2i:
1342 {
1343 pop_long();
1344 push_int();
1345 break;
1346 }
1347 case Bytecodes::_ladd:
1348 case Bytecodes::_land:
1349 case Bytecodes::_ldiv:
1350 case Bytecodes::_lmul:
1351 case Bytecodes::_lor:
1352 case Bytecodes::_lrem:
1353 case Bytecodes::_lsub:
1354 case Bytecodes::_lxor:
1355 {
1356 pop_long();
1357 pop_long();
1358 push_long();
1359 break;
1360 }
1361 case Bytecodes::_laload:
1362 {
1363 pop_int();
1364 ciTypeArrayKlass* array_klass = pop_typeArray();
1365 // Put assert here for right type?
1366 push_long();
1367 break;
1368 }
1369 case Bytecodes::_lastore:
1370 {
1371 pop_long();
1372 pop_int();
1373 pop_typeArray();
1374 // assert here?
1375 break;
1376 }
1377 case Bytecodes::_lcmp:
1378 {
1379 pop_long();
1380 pop_long();
1381 push_int();
1382 break;
1383 }
1384 case Bytecodes::_lconst_0:
1385 case Bytecodes::_lconst_1:
1386 {
1387 push_long();
1388 break;
1389 }
1390 case Bytecodes::_ldc:
1391 case Bytecodes::_ldc_w:
1392 case Bytecodes::_ldc2_w:
1393 {
1394 do_ldc(str);
1395 break;
1396 }
1398 case Bytecodes::_lload: load_local_long(str->get_index()); break;
1399 case Bytecodes::_lload_0: load_local_long(0); break;
1400 case Bytecodes::_lload_1: load_local_long(1); break;
1401 case Bytecodes::_lload_2: load_local_long(2); break;
1402 case Bytecodes::_lload_3: load_local_long(3); break;
1404 case Bytecodes::_lneg:
1405 {
1406 pop_long();
1407 push_long();
1408 break;
1409 }
1410 case Bytecodes::_lreturn:
1411 {
1412 pop_long();
1413 break;
1414 }
1415 case Bytecodes::_lshl:
1416 case Bytecodes::_lshr:
1417 case Bytecodes::_lushr:
1418 {
1419 pop_int();
1420 pop_long();
1421 push_long();
1422 break;
1423 }
1424 case Bytecodes::_lstore: store_local_long(str->get_index()); break;
1425 case Bytecodes::_lstore_0: store_local_long(0); break;
1426 case Bytecodes::_lstore_1: store_local_long(1); break;
1427 case Bytecodes::_lstore_2: store_local_long(2); break;
1428 case Bytecodes::_lstore_3: store_local_long(3); break;
1430 case Bytecodes::_multianewarray: do_multianewarray(str); break;
1432 case Bytecodes::_new: do_new(str); break;
1434 case Bytecodes::_newarray: do_newarray(str); break;
1436 case Bytecodes::_pop:
1437 {
1438 pop();
1439 break;
1440 }
1441 case Bytecodes::_pop2:
1442 {
1443 pop();
1444 pop();
1445 break;
1446 }
1448 case Bytecodes::_putfield: do_putfield(str); break;
1449 case Bytecodes::_putstatic: do_putstatic(str); break;
1451 case Bytecodes::_ret: do_ret(str); break;
1453 case Bytecodes::_swap:
1454 {
1455 ciType* value1 = pop_value();
1456 ciType* value2 = pop_value();
1457 push(value1);
1458 push(value2);
1459 break;
1460 }
1461 case Bytecodes::_wide:
1462 default:
1463 {
1464 // The iterator should skip this.
1465 ShouldNotReachHere();
1466 break;
1467 }
1468 }
1470 if (CITraceTypeFlow) {
1471 print_on(tty);
1472 }
1474 return (_trap_bci != -1);
1475 }
1477 #ifndef PRODUCT
1478 // ------------------------------------------------------------------
1479 // ciTypeFlow::StateVector::print_cell_on
1480 void ciTypeFlow::StateVector::print_cell_on(outputStream* st, Cell c) const {
1481 ciType* type = type_at(c);
1482 if (type == top_type()) {
1483 st->print("top");
1484 } else if (type == bottom_type()) {
1485 st->print("bottom");
1486 } else if (type == null_type()) {
1487 st->print("null");
1488 } else if (type == long2_type()) {
1489 st->print("long2");
1490 } else if (type == double2_type()) {
1491 st->print("double2");
1492 } else if (is_int(type)) {
1493 st->print("int");
1494 } else if (is_long(type)) {
1495 st->print("long");
1496 } else if (is_float(type)) {
1497 st->print("float");
1498 } else if (is_double(type)) {
1499 st->print("double");
1500 } else if (type->is_return_address()) {
1501 st->print("address(%d)", type->as_return_address()->bci());
1502 } else {
1503 if (type->is_klass()) {
1504 type->as_klass()->name()->print_symbol_on(st);
1505 } else {
1506 st->print("UNEXPECTED TYPE");
1507 type->print();
1508 }
1509 }
1510 }
1512 // ------------------------------------------------------------------
1513 // ciTypeFlow::StateVector::print_on
1514 void ciTypeFlow::StateVector::print_on(outputStream* st) const {
1515 int num_locals = _outer->max_locals();
1516 int num_stack = stack_size();
1517 int num_monitors = monitor_count();
1518 st->print_cr(" State : locals %d, stack %d, monitors %d", num_locals, num_stack, num_monitors);
1519 if (num_stack >= 0) {
1520 int i;
1521 for (i = 0; i < num_locals; i++) {
1522 st->print(" local %2d : ", i);
1523 print_cell_on(st, local(i));
1524 st->cr();
1525 }
1526 for (i = 0; i < num_stack; i++) {
1527 st->print(" stack %2d : ", i);
1528 print_cell_on(st, stack(i));
1529 st->cr();
1530 }
1531 }
1532 }
1533 #endif
1536 // ------------------------------------------------------------------
1537 // ciTypeFlow::SuccIter::next
1538 //
1539 void ciTypeFlow::SuccIter::next() {
1540 int succ_ct = _pred->successors()->length();
1541 int next = _index + 1;
1542 if (next < succ_ct) {
1543 _index = next;
1544 _succ = _pred->successors()->at(next);
1545 return;
1546 }
1547 for (int i = next - succ_ct; i < _pred->exceptions()->length(); i++) {
1548 // Do not compile any code for unloaded exception types.
1549 // Following compiler passes are responsible for doing this also.
1550 ciInstanceKlass* exception_klass = _pred->exc_klasses()->at(i);
1551 if (exception_klass->is_loaded()) {
1552 _index = next;
1553 _succ = _pred->exceptions()->at(i);
1554 return;
1555 }
1556 next++;
1557 }
1558 _index = -1;
1559 _succ = NULL;
1560 }
1562 // ------------------------------------------------------------------
1563 // ciTypeFlow::SuccIter::set_succ
1564 //
1565 void ciTypeFlow::SuccIter::set_succ(Block* succ) {
1566 int succ_ct = _pred->successors()->length();
1567 if (_index < succ_ct) {
1568 _pred->successors()->at_put(_index, succ);
1569 } else {
1570 int idx = _index - succ_ct;
1571 _pred->exceptions()->at_put(idx, succ);
1572 }
1573 }
1575 // ciTypeFlow::Block
1576 //
1577 // A basic block.
1579 // ------------------------------------------------------------------
1580 // ciTypeFlow::Block::Block
1581 ciTypeFlow::Block::Block(ciTypeFlow* outer,
1582 ciBlock *ciblk,
1583 ciTypeFlow::JsrSet* jsrs) {
1584 _ciblock = ciblk;
1585 _exceptions = NULL;
1586 _exc_klasses = NULL;
1587 _successors = NULL;
1588 _state = new (outer->arena()) StateVector(outer);
1589 JsrSet* new_jsrs =
1590 new (outer->arena()) JsrSet(outer->arena(), jsrs->size());
1591 jsrs->copy_into(new_jsrs);
1592 _jsrs = new_jsrs;
1593 _next = NULL;
1594 _on_work_list = false;
1595 _backedge_copy = false;
1596 _has_monitorenter = false;
1597 _trap_bci = -1;
1598 _trap_index = 0;
1599 df_init();
1601 if (CITraceTypeFlow) {
1602 tty->print_cr(">> Created new block");
1603 print_on(tty);
1604 }
1606 assert(this->outer() == outer, "outer link set up");
1607 assert(!outer->have_block_count(), "must not have mapped blocks yet");
1608 }
1610 // ------------------------------------------------------------------
1611 // ciTypeFlow::Block::df_init
1612 void ciTypeFlow::Block::df_init() {
1613 _pre_order = -1; assert(!has_pre_order(), "");
1614 _post_order = -1; assert(!has_post_order(), "");
1615 _loop = NULL;
1616 _irreducible_entry = false;
1617 _rpo_next = NULL;
1618 }
1620 // ------------------------------------------------------------------
1621 // ciTypeFlow::Block::successors
1622 //
1623 // Get the successors for this Block.
1624 GrowableArray<ciTypeFlow::Block*>*
1625 ciTypeFlow::Block::successors(ciBytecodeStream* str,
1626 ciTypeFlow::StateVector* state,
1627 ciTypeFlow::JsrSet* jsrs) {
1628 if (_successors == NULL) {
1629 if (CITraceTypeFlow) {
1630 tty->print(">> Computing successors for block ");
1631 print_value_on(tty);
1632 tty->cr();
1633 }
1635 ciTypeFlow* analyzer = outer();
1636 Arena* arena = analyzer->arena();
1637 Block* block = NULL;
1638 bool has_successor = !has_trap() &&
1639 (control() != ciBlock::fall_through_bci || limit() < analyzer->code_size());
1640 if (!has_successor) {
1641 _successors =
1642 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL);
1643 // No successors
1644 } else if (control() == ciBlock::fall_through_bci) {
1645 assert(str->cur_bci() == limit(), "bad block end");
1646 // This block simply falls through to the next.
1647 _successors =
1648 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL);
1650 Block* block = analyzer->block_at(limit(), _jsrs);
1651 assert(_successors->length() == FALL_THROUGH, "");
1652 _successors->append(block);
1653 } else {
1654 int current_bci = str->cur_bci();
1655 int next_bci = str->next_bci();
1656 int branch_bci = -1;
1657 Block* target = NULL;
1658 assert(str->next_bci() == limit(), "bad block end");
1659 // This block is not a simple fall-though. Interpret
1660 // the current bytecode to find our successors.
1661 switch (str->cur_bc()) {
1662 case Bytecodes::_ifeq: case Bytecodes::_ifne:
1663 case Bytecodes::_iflt: case Bytecodes::_ifge:
1664 case Bytecodes::_ifgt: case Bytecodes::_ifle:
1665 case Bytecodes::_if_icmpeq: case Bytecodes::_if_icmpne:
1666 case Bytecodes::_if_icmplt: case Bytecodes::_if_icmpge:
1667 case Bytecodes::_if_icmpgt: case Bytecodes::_if_icmple:
1668 case Bytecodes::_if_acmpeq: case Bytecodes::_if_acmpne:
1669 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull:
1670 // Our successors are the branch target and the next bci.
1671 branch_bci = str->get_dest();
1672 _successors =
1673 new (arena) GrowableArray<Block*>(arena, 2, 0, NULL);
1674 assert(_successors->length() == IF_NOT_TAKEN, "");
1675 _successors->append(analyzer->block_at(next_bci, jsrs));
1676 assert(_successors->length() == IF_TAKEN, "");
1677 _successors->append(analyzer->block_at(branch_bci, jsrs));
1678 break;
1680 case Bytecodes::_goto:
1681 branch_bci = str->get_dest();
1682 _successors =
1683 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL);
1684 assert(_successors->length() == GOTO_TARGET, "");
1685 _successors->append(analyzer->block_at(branch_bci, jsrs));
1686 break;
1688 case Bytecodes::_jsr:
1689 branch_bci = str->get_dest();
1690 _successors =
1691 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL);
1692 assert(_successors->length() == GOTO_TARGET, "");
1693 _successors->append(analyzer->block_at(branch_bci, jsrs));
1694 break;
1696 case Bytecodes::_goto_w:
1697 case Bytecodes::_jsr_w:
1698 _successors =
1699 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL);
1700 assert(_successors->length() == GOTO_TARGET, "");
1701 _successors->append(analyzer->block_at(str->get_far_dest(), jsrs));
1702 break;
1704 case Bytecodes::_tableswitch: {
1705 Bytecode_tableswitch tableswitch(str);
1707 int len = tableswitch.length();
1708 _successors =
1709 new (arena) GrowableArray<Block*>(arena, len+1, 0, NULL);
1710 int bci = current_bci + tableswitch.default_offset();
1711 Block* block = analyzer->block_at(bci, jsrs);
1712 assert(_successors->length() == SWITCH_DEFAULT, "");
1713 _successors->append(block);
1714 while (--len >= 0) {
1715 int bci = current_bci + tableswitch.dest_offset_at(len);
1716 block = analyzer->block_at(bci, jsrs);
1717 assert(_successors->length() >= SWITCH_CASES, "");
1718 _successors->append_if_missing(block);
1719 }
1720 break;
1721 }
1723 case Bytecodes::_lookupswitch: {
1724 Bytecode_lookupswitch lookupswitch(str);
1726 int npairs = lookupswitch.number_of_pairs();
1727 _successors =
1728 new (arena) GrowableArray<Block*>(arena, npairs+1, 0, NULL);
1729 int bci = current_bci + lookupswitch.default_offset();
1730 Block* block = analyzer->block_at(bci, jsrs);
1731 assert(_successors->length() == SWITCH_DEFAULT, "");
1732 _successors->append(block);
1733 while(--npairs >= 0) {
1734 LookupswitchPair pair = lookupswitch.pair_at(npairs);
1735 int bci = current_bci + pair.offset();
1736 Block* block = analyzer->block_at(bci, jsrs);
1737 assert(_successors->length() >= SWITCH_CASES, "");
1738 _successors->append_if_missing(block);
1739 }
1740 break;
1741 }
1743 case Bytecodes::_athrow: case Bytecodes::_ireturn:
1744 case Bytecodes::_lreturn: case Bytecodes::_freturn:
1745 case Bytecodes::_dreturn: case Bytecodes::_areturn:
1746 case Bytecodes::_return:
1747 _successors =
1748 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL);
1749 // No successors
1750 break;
1752 case Bytecodes::_ret: {
1753 _successors =
1754 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL);
1756 Cell local = state->local(str->get_index());
1757 ciType* return_address = state->type_at(local);
1758 assert(return_address->is_return_address(), "verify: wrong type");
1759 int bci = return_address->as_return_address()->bci();
1760 assert(_successors->length() == GOTO_TARGET, "");
1761 _successors->append(analyzer->block_at(bci, jsrs));
1762 break;
1763 }
1765 case Bytecodes::_wide:
1766 default:
1767 ShouldNotReachHere();
1768 break;
1769 }
1770 }
1771 }
1772 return _successors;
1773 }
1775 // ------------------------------------------------------------------
1776 // ciTypeFlow::Block:compute_exceptions
1777 //
1778 // Compute the exceptional successors and types for this Block.
1779 void ciTypeFlow::Block::compute_exceptions() {
1780 assert(_exceptions == NULL && _exc_klasses == NULL, "repeat");
1782 if (CITraceTypeFlow) {
1783 tty->print(">> Computing exceptions for block ");
1784 print_value_on(tty);
1785 tty->cr();
1786 }
1788 ciTypeFlow* analyzer = outer();
1789 Arena* arena = analyzer->arena();
1791 // Any bci in the block will do.
1792 ciExceptionHandlerStream str(analyzer->method(), start());
1794 // Allocate our growable arrays.
1795 int exc_count = str.count();
1796 _exceptions = new (arena) GrowableArray<Block*>(arena, exc_count, 0, NULL);
1797 _exc_klasses = new (arena) GrowableArray<ciInstanceKlass*>(arena, exc_count,
1798 0, NULL);
1800 for ( ; !str.is_done(); str.next()) {
1801 ciExceptionHandler* handler = str.handler();
1802 int bci = handler->handler_bci();
1803 ciInstanceKlass* klass = NULL;
1804 if (bci == -1) {
1805 // There is no catch all. It is possible to exit the method.
1806 break;
1807 }
1808 if (handler->is_catch_all()) {
1809 klass = analyzer->env()->Throwable_klass();
1810 } else {
1811 klass = handler->catch_klass();
1812 }
1813 _exceptions->append(analyzer->block_at(bci, _jsrs));
1814 _exc_klasses->append(klass);
1815 }
1816 }
1818 // ------------------------------------------------------------------
1819 // ciTypeFlow::Block::set_backedge_copy
1820 // Use this only to make a pre-existing public block into a backedge copy.
1821 void ciTypeFlow::Block::set_backedge_copy(bool z) {
1822 assert(z || (z == is_backedge_copy()), "cannot make a backedge copy public");
1823 _backedge_copy = z;
1824 }
1826 // ------------------------------------------------------------------
1827 // ciTypeFlow::Block::is_clonable_exit
1828 //
1829 // At most 2 normal successors, one of which continues looping,
1830 // and all exceptional successors must exit.
1831 bool ciTypeFlow::Block::is_clonable_exit(ciTypeFlow::Loop* lp) {
1832 int normal_cnt = 0;
1833 int in_loop_cnt = 0;
1834 for (SuccIter iter(this); !iter.done(); iter.next()) {
1835 Block* succ = iter.succ();
1836 if (iter.is_normal_ctrl()) {
1837 if (++normal_cnt > 2) return false;
1838 if (lp->contains(succ->loop())) {
1839 if (++in_loop_cnt > 1) return false;
1840 }
1841 } else {
1842 if (lp->contains(succ->loop())) return false;
1843 }
1844 }
1845 return in_loop_cnt == 1;
1846 }
1848 // ------------------------------------------------------------------
1849 // ciTypeFlow::Block::looping_succ
1850 //
1851 ciTypeFlow::Block* ciTypeFlow::Block::looping_succ(ciTypeFlow::Loop* lp) {
1852 assert(successors()->length() <= 2, "at most 2 normal successors");
1853 for (SuccIter iter(this); !iter.done(); iter.next()) {
1854 Block* succ = iter.succ();
1855 if (lp->contains(succ->loop())) {
1856 return succ;
1857 }
1858 }
1859 return NULL;
1860 }
1862 #ifndef PRODUCT
1863 // ------------------------------------------------------------------
1864 // ciTypeFlow::Block::print_value_on
1865 void ciTypeFlow::Block::print_value_on(outputStream* st) const {
1866 if (has_pre_order()) st->print("#%-2d ", pre_order());
1867 if (has_rpo()) st->print("rpo#%-2d ", rpo());
1868 st->print("[%d - %d)", start(), limit());
1869 if (is_loop_head()) st->print(" lphd");
1870 if (is_irreducible_entry()) st->print(" irred");
1871 if (_jsrs->size() > 0) { st->print("/"); _jsrs->print_on(st); }
1872 if (is_backedge_copy()) st->print("/backedge_copy");
1873 }
1875 // ------------------------------------------------------------------
1876 // ciTypeFlow::Block::print_on
1877 void ciTypeFlow::Block::print_on(outputStream* st) const {
1878 if ((Verbose || WizardMode) && (limit() >= 0)) {
1879 // Don't print 'dummy' blocks (i.e. blocks with limit() '-1')
1880 outer()->method()->print_codes_on(start(), limit(), st);
1881 }
1882 st->print_cr(" ==================================================== ");
1883 st->print (" ");
1884 print_value_on(st);
1885 st->print(" Stored locals: "); def_locals()->print_on(st, outer()->method()->max_locals()); tty->cr();
1886 if (loop() && loop()->parent() != NULL) {
1887 st->print(" loops:");
1888 Loop* lp = loop();
1889 do {
1890 st->print(" %d<-%d", lp->head()->pre_order(),lp->tail()->pre_order());
1891 if (lp->is_irreducible()) st->print("(ir)");
1892 lp = lp->parent();
1893 } while (lp->parent() != NULL);
1894 }
1895 st->cr();
1896 _state->print_on(st);
1897 if (_successors == NULL) {
1898 st->print_cr(" No successor information");
1899 } else {
1900 int num_successors = _successors->length();
1901 st->print_cr(" Successors : %d", num_successors);
1902 for (int i = 0; i < num_successors; i++) {
1903 Block* successor = _successors->at(i);
1904 st->print(" ");
1905 successor->print_value_on(st);
1906 st->cr();
1907 }
1908 }
1909 if (_exceptions == NULL) {
1910 st->print_cr(" No exception information");
1911 } else {
1912 int num_exceptions = _exceptions->length();
1913 st->print_cr(" Exceptions : %d", num_exceptions);
1914 for (int i = 0; i < num_exceptions; i++) {
1915 Block* exc_succ = _exceptions->at(i);
1916 ciInstanceKlass* exc_klass = _exc_klasses->at(i);
1917 st->print(" ");
1918 exc_succ->print_value_on(st);
1919 st->print(" -- ");
1920 exc_klass->name()->print_symbol_on(st);
1921 st->cr();
1922 }
1923 }
1924 if (has_trap()) {
1925 st->print_cr(" Traps on %d with trap index %d", trap_bci(), trap_index());
1926 }
1927 st->print_cr(" ==================================================== ");
1928 }
1929 #endif
1931 #ifndef PRODUCT
1932 // ------------------------------------------------------------------
1933 // ciTypeFlow::LocalSet::print_on
1934 void ciTypeFlow::LocalSet::print_on(outputStream* st, int limit) const {
1935 st->print("{");
1936 for (int i = 0; i < max; i++) {
1937 if (test(i)) st->print(" %d", i);
1938 }
1939 if (limit > max) {
1940 st->print(" %d..%d ", max, limit);
1941 }
1942 st->print(" }");
1943 }
1944 #endif
1946 // ciTypeFlow
1947 //
1948 // This is a pass over the bytecodes which computes the following:
1949 // basic block structure
1950 // interpreter type-states (a la the verifier)
1952 // ------------------------------------------------------------------
1953 // ciTypeFlow::ciTypeFlow
1954 ciTypeFlow::ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci) {
1955 _env = env;
1956 _method = method;
1957 _methodBlocks = method->get_method_blocks();
1958 _max_locals = method->max_locals();
1959 _max_stack = method->max_stack();
1960 _code_size = method->code_size();
1961 _has_irreducible_entry = false;
1962 _osr_bci = osr_bci;
1963 _failure_reason = NULL;
1964 assert(0 <= start_bci() && start_bci() < code_size() , err_msg("correct osr_bci argument: 0 <= %d < %d", start_bci(), code_size()));
1965 _work_list = NULL;
1967 _ciblock_count = _methodBlocks->num_blocks();
1968 _idx_to_blocklist = NEW_ARENA_ARRAY(arena(), GrowableArray<Block*>*, _ciblock_count);
1969 for (int i = 0; i < _ciblock_count; i++) {
1970 _idx_to_blocklist[i] = NULL;
1971 }
1972 _block_map = NULL; // until all blocks are seen
1973 _jsr_count = 0;
1974 _jsr_records = NULL;
1975 }
1977 // ------------------------------------------------------------------
1978 // ciTypeFlow::work_list_next
1979 //
1980 // Get the next basic block from our work list.
1981 ciTypeFlow::Block* ciTypeFlow::work_list_next() {
1982 assert(!work_list_empty(), "work list must not be empty");
1983 Block* next_block = _work_list;
1984 _work_list = next_block->next();
1985 next_block->set_next(NULL);
1986 next_block->set_on_work_list(false);
1987 return next_block;
1988 }
1990 // ------------------------------------------------------------------
1991 // ciTypeFlow::add_to_work_list
1992 //
1993 // Add a basic block to our work list.
1994 // List is sorted by decreasing postorder sort (same as increasing RPO)
1995 void ciTypeFlow::add_to_work_list(ciTypeFlow::Block* block) {
1996 assert(!block->is_on_work_list(), "must not already be on work list");
1998 if (CITraceTypeFlow) {
1999 tty->print(">> Adding block ");
2000 block->print_value_on(tty);
2001 tty->print_cr(" to the work list : ");
2002 }
2004 block->set_on_work_list(true);
2006 // decreasing post order sort
2008 Block* prev = NULL;
2009 Block* current = _work_list;
2010 int po = block->post_order();
2011 while (current != NULL) {
2012 if (!current->has_post_order() || po > current->post_order())
2013 break;
2014 prev = current;
2015 current = current->next();
2016 }
2017 if (prev == NULL) {
2018 block->set_next(_work_list);
2019 _work_list = block;
2020 } else {
2021 block->set_next(current);
2022 prev->set_next(block);
2023 }
2025 if (CITraceTypeFlow) {
2026 tty->cr();
2027 }
2028 }
2030 // ------------------------------------------------------------------
2031 // ciTypeFlow::block_at
2032 //
2033 // Return the block beginning at bci which has a JsrSet compatible
2034 // with jsrs.
2035 ciTypeFlow::Block* ciTypeFlow::block_at(int bci, ciTypeFlow::JsrSet* jsrs, CreateOption option) {
2036 // First find the right ciBlock.
2037 if (CITraceTypeFlow) {
2038 tty->print(">> Requesting block for %d/", bci);
2039 jsrs->print_on(tty);
2040 tty->cr();
2041 }
2043 ciBlock* ciblk = _methodBlocks->block_containing(bci);
2044 assert(ciblk->start_bci() == bci, "bad ciBlock boundaries");
2045 Block* block = get_block_for(ciblk->index(), jsrs, option);
2047 assert(block == NULL? (option == no_create): block->is_backedge_copy() == (option == create_backedge_copy), "create option consistent with result");
2049 if (CITraceTypeFlow) {
2050 if (block != NULL) {
2051 tty->print(">> Found block ");
2052 block->print_value_on(tty);
2053 tty->cr();
2054 } else {
2055 tty->print_cr(">> No such block.");
2056 }
2057 }
2059 return block;
2060 }
2062 // ------------------------------------------------------------------
2063 // ciTypeFlow::make_jsr_record
2064 //
2065 // Make a JsrRecord for a given (entry, return) pair, if such a record
2066 // does not already exist.
2067 ciTypeFlow::JsrRecord* ciTypeFlow::make_jsr_record(int entry_address,
2068 int return_address) {
2069 if (_jsr_records == NULL) {
2070 _jsr_records = new (arena()) GrowableArray<JsrRecord*>(arena(),
2071 _jsr_count,
2072 0,
2073 NULL);
2074 }
2075 JsrRecord* record = NULL;
2076 int len = _jsr_records->length();
2077 for (int i = 0; i < len; i++) {
2078 JsrRecord* record = _jsr_records->at(i);
2079 if (record->entry_address() == entry_address &&
2080 record->return_address() == return_address) {
2081 return record;
2082 }
2083 }
2085 record = new (arena()) JsrRecord(entry_address, return_address);
2086 _jsr_records->append(record);
2087 return record;
2088 }
2090 // ------------------------------------------------------------------
2091 // ciTypeFlow::flow_exceptions
2092 //
2093 // Merge the current state into all exceptional successors at the
2094 // current point in the code.
2095 void ciTypeFlow::flow_exceptions(GrowableArray<ciTypeFlow::Block*>* exceptions,
2096 GrowableArray<ciInstanceKlass*>* exc_klasses,
2097 ciTypeFlow::StateVector* state) {
2098 int len = exceptions->length();
2099 assert(exc_klasses->length() == len, "must have same length");
2100 for (int i = 0; i < len; i++) {
2101 Block* block = exceptions->at(i);
2102 ciInstanceKlass* exception_klass = exc_klasses->at(i);
2104 if (!exception_klass->is_loaded()) {
2105 // Do not compile any code for unloaded exception types.
2106 // Following compiler passes are responsible for doing this also.
2107 continue;
2108 }
2110 if (block->meet_exception(exception_klass, state)) {
2111 // Block was modified and has PO. Add it to the work list.
2112 if (block->has_post_order() &&
2113 !block->is_on_work_list()) {
2114 add_to_work_list(block);
2115 }
2116 }
2117 }
2118 }
2120 // ------------------------------------------------------------------
2121 // ciTypeFlow::flow_successors
2122 //
2123 // Merge the current state into all successors at the current point
2124 // in the code.
2125 void ciTypeFlow::flow_successors(GrowableArray<ciTypeFlow::Block*>* successors,
2126 ciTypeFlow::StateVector* state) {
2127 int len = successors->length();
2128 for (int i = 0; i < len; i++) {
2129 Block* block = successors->at(i);
2130 if (block->meet(state)) {
2131 // Block was modified and has PO. Add it to the work list.
2132 if (block->has_post_order() &&
2133 !block->is_on_work_list()) {
2134 add_to_work_list(block);
2135 }
2136 }
2137 }
2138 }
2140 // ------------------------------------------------------------------
2141 // ciTypeFlow::can_trap
2142 //
2143 // Tells if a given instruction is able to generate an exception edge.
2144 bool ciTypeFlow::can_trap(ciBytecodeStream& str) {
2145 // Cf. GenerateOopMap::do_exception_edge.
2146 if (!Bytecodes::can_trap(str.cur_bc())) return false;
2148 switch (str.cur_bc()) {
2149 // %%% FIXME: ldc of Class can generate an exception
2150 case Bytecodes::_ldc:
2151 case Bytecodes::_ldc_w:
2152 case Bytecodes::_ldc2_w:
2153 case Bytecodes::_aload_0:
2154 // These bytecodes can trap for rewriting. We need to assume that
2155 // they do not throw exceptions to make the monitor analysis work.
2156 return false;
2158 case Bytecodes::_ireturn:
2159 case Bytecodes::_lreturn:
2160 case Bytecodes::_freturn:
2161 case Bytecodes::_dreturn:
2162 case Bytecodes::_areturn:
2163 case Bytecodes::_return:
2164 // We can assume the monitor stack is empty in this analysis.
2165 return false;
2167 case Bytecodes::_monitorexit:
2168 // We can assume monitors are matched in this analysis.
2169 return false;
2170 }
2172 return true;
2173 }
2175 // ------------------------------------------------------------------
2176 // ciTypeFlow::clone_loop_heads
2177 //
2178 // Clone the loop heads
2179 bool ciTypeFlow::clone_loop_heads(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) {
2180 bool rslt = false;
2181 for (PreorderLoops iter(loop_tree_root()); !iter.done(); iter.next()) {
2182 lp = iter.current();
2183 Block* head = lp->head();
2184 if (lp == loop_tree_root() ||
2185 lp->is_irreducible() ||
2186 !head->is_clonable_exit(lp))
2187 continue;
2189 // Avoid BoxLock merge.
2190 if (EliminateNestedLocks && head->has_monitorenter())
2191 continue;
2193 // check not already cloned
2194 if (head->backedge_copy_count() != 0)
2195 continue;
2197 // Don't clone head of OSR loop to get correct types in start block.
2198 if (is_osr_flow() && head->start() == start_bci())
2199 continue;
2201 // check _no_ shared head below us
2202 Loop* ch;
2203 for (ch = lp->child(); ch != NULL && ch->head() != head; ch = ch->sibling());
2204 if (ch != NULL)
2205 continue;
2207 // Clone head
2208 Block* new_head = head->looping_succ(lp);
2209 Block* clone = clone_loop_head(lp, temp_vector, temp_set);
2210 // Update lp's info
2211 clone->set_loop(lp);
2212 lp->set_head(new_head);
2213 lp->set_tail(clone);
2214 // And move original head into outer loop
2215 head->set_loop(lp->parent());
2217 rslt = true;
2218 }
2219 return rslt;
2220 }
2222 // ------------------------------------------------------------------
2223 // ciTypeFlow::clone_loop_head
2224 //
2225 // Clone lp's head and replace tail's successors with clone.
2226 //
2227 // |
2228 // v
2229 // head <-> body
2230 // |
2231 // v
2232 // exit
2233 //
2234 // new_head
2235 //
2236 // |
2237 // v
2238 // head ----------\
2239 // | |
2240 // | v
2241 // | clone <-> body
2242 // | |
2243 // | /--/
2244 // | |
2245 // v v
2246 // exit
2247 //
2248 ciTypeFlow::Block* ciTypeFlow::clone_loop_head(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) {
2249 Block* head = lp->head();
2250 Block* tail = lp->tail();
2251 if (CITraceTypeFlow) {
2252 tty->print(">> Requesting clone of loop head "); head->print_value_on(tty);
2253 tty->print(" for predecessor "); tail->print_value_on(tty);
2254 tty->cr();
2255 }
2256 Block* clone = block_at(head->start(), head->jsrs(), create_backedge_copy);
2257 assert(clone->backedge_copy_count() == 1, "one backedge copy for all back edges");
2259 assert(!clone->has_pre_order(), "just created");
2260 clone->set_next_pre_order();
2262 // Insert clone after (orig) tail in reverse post order
2263 clone->set_rpo_next(tail->rpo_next());
2264 tail->set_rpo_next(clone);
2266 // tail->head becomes tail->clone
2267 for (SuccIter iter(tail); !iter.done(); iter.next()) {
2268 if (iter.succ() == head) {
2269 iter.set_succ(clone);
2270 }
2271 }
2272 flow_block(tail, temp_vector, temp_set);
2273 if (head == tail) {
2274 // For self-loops, clone->head becomes clone->clone
2275 flow_block(clone, temp_vector, temp_set);
2276 for (SuccIter iter(clone); !iter.done(); iter.next()) {
2277 if (iter.succ() == head) {
2278 iter.set_succ(clone);
2279 break;
2280 }
2281 }
2282 }
2283 flow_block(clone, temp_vector, temp_set);
2285 return clone;
2286 }
2288 // ------------------------------------------------------------------
2289 // ciTypeFlow::flow_block
2290 //
2291 // Interpret the effects of the bytecodes on the incoming state
2292 // vector of a basic block. Push the changed state to succeeding
2293 // basic blocks.
2294 void ciTypeFlow::flow_block(ciTypeFlow::Block* block,
2295 ciTypeFlow::StateVector* state,
2296 ciTypeFlow::JsrSet* jsrs) {
2297 if (CITraceTypeFlow) {
2298 tty->print("\n>> ANALYZING BLOCK : ");
2299 tty->cr();
2300 block->print_on(tty);
2301 }
2302 assert(block->has_pre_order(), "pre-order is assigned before 1st flow");
2304 int start = block->start();
2305 int limit = block->limit();
2306 int control = block->control();
2307 if (control != ciBlock::fall_through_bci) {
2308 limit = control;
2309 }
2311 // Grab the state from the current block.
2312 block->copy_state_into(state);
2313 state->def_locals()->clear();
2315 GrowableArray<Block*>* exceptions = block->exceptions();
2316 GrowableArray<ciInstanceKlass*>* exc_klasses = block->exc_klasses();
2317 bool has_exceptions = exceptions->length() > 0;
2319 bool exceptions_used = false;
2321 ciBytecodeStream str(method());
2322 str.reset_to_bci(start);
2323 Bytecodes::Code code;
2324 while ((code = str.next()) != ciBytecodeStream::EOBC() &&
2325 str.cur_bci() < limit) {
2326 // Check for exceptional control flow from this point.
2327 if (has_exceptions && can_trap(str)) {
2328 flow_exceptions(exceptions, exc_klasses, state);
2329 exceptions_used = true;
2330 }
2331 // Apply the effects of the current bytecode to our state.
2332 bool res = state->apply_one_bytecode(&str);
2334 // Watch for bailouts.
2335 if (failing()) return;
2337 if (str.cur_bc() == Bytecodes::_monitorenter) {
2338 block->set_has_monitorenter();
2339 }
2341 if (res) {
2343 // We have encountered a trap. Record it in this block.
2344 block->set_trap(state->trap_bci(), state->trap_index());
2346 if (CITraceTypeFlow) {
2347 tty->print_cr(">> Found trap");
2348 block->print_on(tty);
2349 }
2351 // Save set of locals defined in this block
2352 block->def_locals()->add(state->def_locals());
2354 // Record (no) successors.
2355 block->successors(&str, state, jsrs);
2357 assert(!has_exceptions || exceptions_used, "Not removing exceptions");
2359 // Discontinue interpretation of this Block.
2360 return;
2361 }
2362 }
2364 GrowableArray<Block*>* successors = NULL;
2365 if (control != ciBlock::fall_through_bci) {
2366 // Check for exceptional control flow from this point.
2367 if (has_exceptions && can_trap(str)) {
2368 flow_exceptions(exceptions, exc_klasses, state);
2369 exceptions_used = true;
2370 }
2372 // Fix the JsrSet to reflect effect of the bytecode.
2373 block->copy_jsrs_into(jsrs);
2374 jsrs->apply_control(this, &str, state);
2376 // Find successor edges based on old state and new JsrSet.
2377 successors = block->successors(&str, state, jsrs);
2379 // Apply the control changes to the state.
2380 state->apply_one_bytecode(&str);
2381 } else {
2382 // Fall through control
2383 successors = block->successors(&str, NULL, NULL);
2384 }
2386 // Save set of locals defined in this block
2387 block->def_locals()->add(state->def_locals());
2389 // Remove untaken exception paths
2390 if (!exceptions_used)
2391 exceptions->clear();
2393 // Pass our state to successors.
2394 flow_successors(successors, state);
2395 }
2397 // ------------------------------------------------------------------
2398 // ciTypeFlow::PostOrderLoops::next
2399 //
2400 // Advance to next loop tree using a postorder, left-to-right traversal.
2401 void ciTypeFlow::PostorderLoops::next() {
2402 assert(!done(), "must not be done.");
2403 if (_current->sibling() != NULL) {
2404 _current = _current->sibling();
2405 while (_current->child() != NULL) {
2406 _current = _current->child();
2407 }
2408 } else {
2409 _current = _current->parent();
2410 }
2411 }
2413 // ------------------------------------------------------------------
2414 // ciTypeFlow::PreOrderLoops::next
2415 //
2416 // Advance to next loop tree using a preorder, left-to-right traversal.
2417 void ciTypeFlow::PreorderLoops::next() {
2418 assert(!done(), "must not be done.");
2419 if (_current->child() != NULL) {
2420 _current = _current->child();
2421 } else if (_current->sibling() != NULL) {
2422 _current = _current->sibling();
2423 } else {
2424 while (_current != _root && _current->sibling() == NULL) {
2425 _current = _current->parent();
2426 }
2427 if (_current == _root) {
2428 _current = NULL;
2429 assert(done(), "must be done.");
2430 } else {
2431 assert(_current->sibling() != NULL, "must be more to do");
2432 _current = _current->sibling();
2433 }
2434 }
2435 }
2437 // ------------------------------------------------------------------
2438 // ciTypeFlow::Loop::sorted_merge
2439 //
2440 // Merge the branch lp into this branch, sorting on the loop head
2441 // pre_orders. Returns the leaf of the merged branch.
2442 // Child and sibling pointers will be setup later.
2443 // Sort is (looking from leaf towards the root)
2444 // descending on primary key: loop head's pre_order, and
2445 // ascending on secondary key: loop tail's pre_order.
2446 ciTypeFlow::Loop* ciTypeFlow::Loop::sorted_merge(Loop* lp) {
2447 Loop* leaf = this;
2448 Loop* prev = NULL;
2449 Loop* current = leaf;
2450 while (lp != NULL) {
2451 int lp_pre_order = lp->head()->pre_order();
2452 // Find insertion point for "lp"
2453 while (current != NULL) {
2454 if (current == lp)
2455 return leaf; // Already in list
2456 if (current->head()->pre_order() < lp_pre_order)
2457 break;
2458 if (current->head()->pre_order() == lp_pre_order &&
2459 current->tail()->pre_order() > lp->tail()->pre_order()) {
2460 break;
2461 }
2462 prev = current;
2463 current = current->parent();
2464 }
2465 Loop* next_lp = lp->parent(); // Save future list of items to insert
2466 // Insert lp before current
2467 lp->set_parent(current);
2468 if (prev != NULL) {
2469 prev->set_parent(lp);
2470 } else {
2471 leaf = lp;
2472 }
2473 prev = lp; // Inserted item is new prev[ious]
2474 lp = next_lp; // Next item to insert
2475 }
2476 return leaf;
2477 }
2479 // ------------------------------------------------------------------
2480 // ciTypeFlow::build_loop_tree
2481 //
2482 // Incrementally build loop tree.
2483 void ciTypeFlow::build_loop_tree(Block* blk) {
2484 assert(!blk->is_post_visited(), "precondition");
2485 Loop* innermost = NULL; // merge of loop tree branches over all successors
2487 for (SuccIter iter(blk); !iter.done(); iter.next()) {
2488 Loop* lp = NULL;
2489 Block* succ = iter.succ();
2490 if (!succ->is_post_visited()) {
2491 // Found backedge since predecessor post visited, but successor is not
2492 assert(succ->pre_order() <= blk->pre_order(), "should be backedge");
2494 // Create a LoopNode to mark this loop.
2495 lp = new (arena()) Loop(succ, blk);
2496 if (succ->loop() == NULL)
2497 succ->set_loop(lp);
2498 // succ->loop will be updated to innermost loop on a later call, when blk==succ
2500 } else { // Nested loop
2501 lp = succ->loop();
2503 // If succ is loop head, find outer loop.
2504 while (lp != NULL && lp->head() == succ) {
2505 lp = lp->parent();
2506 }
2507 if (lp == NULL) {
2508 // Infinite loop, it's parent is the root
2509 lp = loop_tree_root();
2510 }
2511 }
2513 // Check for irreducible loop.
2514 // Successor has already been visited. If the successor's loop head
2515 // has already been post-visited, then this is another entry into the loop.
2516 while (lp->head()->is_post_visited() && lp != loop_tree_root()) {
2517 _has_irreducible_entry = true;
2518 lp->set_irreducible(succ);
2519 if (!succ->is_on_work_list()) {
2520 // Assume irreducible entries need more data flow
2521 add_to_work_list(succ);
2522 }
2523 Loop* plp = lp->parent();
2524 if (plp == NULL) {
2525 // This only happens for some irreducible cases. The parent
2526 // will be updated during a later pass.
2527 break;
2528 }
2529 lp = plp;
2530 }
2532 // Merge loop tree branch for all successors.
2533 innermost = innermost == NULL ? lp : innermost->sorted_merge(lp);
2535 } // end loop
2537 if (innermost == NULL) {
2538 assert(blk->successors()->length() == 0, "CFG exit");
2539 blk->set_loop(loop_tree_root());
2540 } else if (innermost->head() == blk) {
2541 // If loop header, complete the tree pointers
2542 if (blk->loop() != innermost) {
2543 #ifdef ASSERT
2544 assert(blk->loop()->head() == innermost->head(), "same head");
2545 Loop* dl;
2546 for (dl = innermost; dl != NULL && dl != blk->loop(); dl = dl->parent());
2547 assert(dl == blk->loop(), "blk->loop() already in innermost list");
2548 #endif
2549 blk->set_loop(innermost);
2550 }
2551 innermost->def_locals()->add(blk->def_locals());
2552 Loop* l = innermost;
2553 Loop* p = l->parent();
2554 while (p && l->head() == blk) {
2555 l->set_sibling(p->child()); // Put self on parents 'next child'
2556 p->set_child(l); // Make self the first child of parent
2557 p->def_locals()->add(l->def_locals());
2558 l = p; // Walk up the parent chain
2559 p = l->parent();
2560 }
2561 } else {
2562 blk->set_loop(innermost);
2563 innermost->def_locals()->add(blk->def_locals());
2564 }
2565 }
2567 // ------------------------------------------------------------------
2568 // ciTypeFlow::Loop::contains
2569 //
2570 // Returns true if lp is nested loop.
2571 bool ciTypeFlow::Loop::contains(ciTypeFlow::Loop* lp) const {
2572 assert(lp != NULL, "");
2573 if (this == lp || head() == lp->head()) return true;
2574 int depth1 = depth();
2575 int depth2 = lp->depth();
2576 if (depth1 > depth2)
2577 return false;
2578 while (depth1 < depth2) {
2579 depth2--;
2580 lp = lp->parent();
2581 }
2582 return this == lp;
2583 }
2585 // ------------------------------------------------------------------
2586 // ciTypeFlow::Loop::depth
2587 //
2588 // Loop depth
2589 int ciTypeFlow::Loop::depth() const {
2590 int dp = 0;
2591 for (Loop* lp = this->parent(); lp != NULL; lp = lp->parent())
2592 dp++;
2593 return dp;
2594 }
2596 #ifndef PRODUCT
2597 // ------------------------------------------------------------------
2598 // ciTypeFlow::Loop::print
2599 void ciTypeFlow::Loop::print(outputStream* st, int indent) const {
2600 for (int i = 0; i < indent; i++) st->print(" ");
2601 st->print("%d<-%d %s",
2602 is_root() ? 0 : this->head()->pre_order(),
2603 is_root() ? 0 : this->tail()->pre_order(),
2604 is_irreducible()?" irr":"");
2605 st->print(" defs: ");
2606 def_locals()->print_on(st, _head->outer()->method()->max_locals());
2607 st->cr();
2608 for (Loop* ch = child(); ch != NULL; ch = ch->sibling())
2609 ch->print(st, indent+2);
2610 }
2611 #endif
2613 // ------------------------------------------------------------------
2614 // ciTypeFlow::df_flow_types
2615 //
2616 // Perform the depth first type flow analysis. Helper for flow_types.
2617 void ciTypeFlow::df_flow_types(Block* start,
2618 bool do_flow,
2619 StateVector* temp_vector,
2620 JsrSet* temp_set) {
2621 int dft_len = 100;
2622 GrowableArray<Block*> stk(dft_len);
2624 ciBlock* dummy = _methodBlocks->make_dummy_block();
2625 JsrSet* root_set = new JsrSet(NULL, 0);
2626 Block* root_head = new (arena()) Block(this, dummy, root_set);
2627 Block* root_tail = new (arena()) Block(this, dummy, root_set);
2628 root_head->set_pre_order(0);
2629 root_head->set_post_order(0);
2630 root_tail->set_pre_order(max_jint);
2631 root_tail->set_post_order(max_jint);
2632 set_loop_tree_root(new (arena()) Loop(root_head, root_tail));
2634 stk.push(start);
2636 _next_pre_order = 0; // initialize pre_order counter
2637 _rpo_list = NULL;
2638 int next_po = 0; // initialize post_order counter
2640 // Compute RPO and the control flow graph
2641 int size;
2642 while ((size = stk.length()) > 0) {
2643 Block* blk = stk.top(); // Leave node on stack
2644 if (!blk->is_visited()) {
2645 // forward arc in graph
2646 assert (!blk->has_pre_order(), "");
2647 blk->set_next_pre_order();
2649 if (_next_pre_order >= MaxNodeLimit / 2) {
2650 // Too many basic blocks. Bail out.
2651 // This can happen when try/finally constructs are nested to depth N,
2652 // and there is O(2**N) cloning of jsr bodies. See bug 4697245!
2653 // "MaxNodeLimit / 2" is used because probably the parser will
2654 // generate at least twice that many nodes and bail out.
2655 record_failure("too many basic blocks");
2656 return;
2657 }
2658 if (do_flow) {
2659 flow_block(blk, temp_vector, temp_set);
2660 if (failing()) return; // Watch for bailouts.
2661 }
2662 } else if (!blk->is_post_visited()) {
2663 // cross or back arc
2664 for (SuccIter iter(blk); !iter.done(); iter.next()) {
2665 Block* succ = iter.succ();
2666 if (!succ->is_visited()) {
2667 stk.push(succ);
2668 }
2669 }
2670 if (stk.length() == size) {
2671 // There were no additional children, post visit node now
2672 stk.pop(); // Remove node from stack
2674 build_loop_tree(blk);
2675 blk->set_post_order(next_po++); // Assign post order
2676 prepend_to_rpo_list(blk);
2677 assert(blk->is_post_visited(), "");
2679 if (blk->is_loop_head() && !blk->is_on_work_list()) {
2680 // Assume loop heads need more data flow
2681 add_to_work_list(blk);
2682 }
2683 }
2684 } else {
2685 stk.pop(); // Remove post-visited node from stack
2686 }
2687 }
2688 }
2690 // ------------------------------------------------------------------
2691 // ciTypeFlow::flow_types
2692 //
2693 // Perform the type flow analysis, creating and cloning Blocks as
2694 // necessary.
2695 void ciTypeFlow::flow_types() {
2696 ResourceMark rm;
2697 StateVector* temp_vector = new StateVector(this);
2698 JsrSet* temp_set = new JsrSet(NULL, 16);
2700 // Create the method entry block.
2701 Block* start = block_at(start_bci(), temp_set);
2703 // Load the initial state into it.
2704 const StateVector* start_state = get_start_state();
2705 if (failing()) return;
2706 start->meet(start_state);
2708 // Depth first visit
2709 df_flow_types(start, true /*do flow*/, temp_vector, temp_set);
2711 if (failing()) return;
2712 assert(_rpo_list == start, "must be start");
2714 // Any loops found?
2715 if (loop_tree_root()->child() != NULL &&
2716 env()->comp_level() >= CompLevel_full_optimization) {
2717 // Loop optimizations are not performed on Tier1 compiles.
2719 bool changed = clone_loop_heads(loop_tree_root(), temp_vector, temp_set);
2721 // If some loop heads were cloned, recompute postorder and loop tree
2722 if (changed) {
2723 loop_tree_root()->set_child(NULL);
2724 for (Block* blk = _rpo_list; blk != NULL;) {
2725 Block* next = blk->rpo_next();
2726 blk->df_init();
2727 blk = next;
2728 }
2729 df_flow_types(start, false /*no flow*/, temp_vector, temp_set);
2730 }
2731 }
2733 if (CITraceTypeFlow) {
2734 tty->print_cr("\nLoop tree");
2735 loop_tree_root()->print();
2736 }
2738 // Continue flow analysis until fixed point reached
2740 debug_only(int max_block = _next_pre_order;)
2742 while (!work_list_empty()) {
2743 Block* blk = work_list_next();
2744 assert (blk->has_post_order(), "post order assigned above");
2746 flow_block(blk, temp_vector, temp_set);
2748 assert (max_block == _next_pre_order, "no new blocks");
2749 assert (!failing(), "no more bailouts");
2750 }
2751 }
2753 // ------------------------------------------------------------------
2754 // ciTypeFlow::map_blocks
2755 //
2756 // Create the block map, which indexes blocks in reverse post-order.
2757 void ciTypeFlow::map_blocks() {
2758 assert(_block_map == NULL, "single initialization");
2759 int block_ct = _next_pre_order;
2760 _block_map = NEW_ARENA_ARRAY(arena(), Block*, block_ct);
2761 assert(block_ct == block_count(), "");
2763 Block* blk = _rpo_list;
2764 for (int m = 0; m < block_ct; m++) {
2765 int rpo = blk->rpo();
2766 assert(rpo == m, "should be sequential");
2767 _block_map[rpo] = blk;
2768 blk = blk->rpo_next();
2769 }
2770 assert(blk == NULL, "should be done");
2772 for (int j = 0; j < block_ct; j++) {
2773 assert(_block_map[j] != NULL, "must not drop any blocks");
2774 Block* block = _block_map[j];
2775 // Remove dead blocks from successor lists:
2776 for (int e = 0; e <= 1; e++) {
2777 GrowableArray<Block*>* l = e? block->exceptions(): block->successors();
2778 for (int k = 0; k < l->length(); k++) {
2779 Block* s = l->at(k);
2780 if (!s->has_post_order()) {
2781 if (CITraceTypeFlow) {
2782 tty->print("Removing dead %s successor of #%d: ", (e? "exceptional": "normal"), block->pre_order());
2783 s->print_value_on(tty);
2784 tty->cr();
2785 }
2786 l->remove(s);
2787 --k;
2788 }
2789 }
2790 }
2791 }
2792 }
2794 // ------------------------------------------------------------------
2795 // ciTypeFlow::get_block_for
2796 //
2797 // Find a block with this ciBlock which has a compatible JsrSet.
2798 // If no such block exists, create it, unless the option is no_create.
2799 // If the option is create_backedge_copy, always create a fresh backedge copy.
2800 ciTypeFlow::Block* ciTypeFlow::get_block_for(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs, CreateOption option) {
2801 Arena* a = arena();
2802 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex];
2803 if (blocks == NULL) {
2804 // Query only?
2805 if (option == no_create) return NULL;
2807 // Allocate the growable array.
2808 blocks = new (a) GrowableArray<Block*>(a, 4, 0, NULL);
2809 _idx_to_blocklist[ciBlockIndex] = blocks;
2810 }
2812 if (option != create_backedge_copy) {
2813 int len = blocks->length();
2814 for (int i = 0; i < len; i++) {
2815 Block* block = blocks->at(i);
2816 if (!block->is_backedge_copy() && block->is_compatible_with(jsrs)) {
2817 return block;
2818 }
2819 }
2820 }
2822 // Query only?
2823 if (option == no_create) return NULL;
2825 // We did not find a compatible block. Create one.
2826 Block* new_block = new (a) Block(this, _methodBlocks->block(ciBlockIndex), jsrs);
2827 if (option == create_backedge_copy) new_block->set_backedge_copy(true);
2828 blocks->append(new_block);
2829 return new_block;
2830 }
2832 // ------------------------------------------------------------------
2833 // ciTypeFlow::backedge_copy_count
2834 //
2835 int ciTypeFlow::backedge_copy_count(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs) const {
2836 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex];
2838 if (blocks == NULL) {
2839 return 0;
2840 }
2842 int count = 0;
2843 int len = blocks->length();
2844 for (int i = 0; i < len; i++) {
2845 Block* block = blocks->at(i);
2846 if (block->is_backedge_copy() && block->is_compatible_with(jsrs)) {
2847 count++;
2848 }
2849 }
2851 return count;
2852 }
2854 // ------------------------------------------------------------------
2855 // ciTypeFlow::do_flow
2856 //
2857 // Perform type inference flow analysis.
2858 void ciTypeFlow::do_flow() {
2859 if (CITraceTypeFlow) {
2860 tty->print_cr("\nPerforming flow analysis on method");
2861 method()->print();
2862 if (is_osr_flow()) tty->print(" at OSR bci %d", start_bci());
2863 tty->cr();
2864 method()->print_codes();
2865 }
2866 if (CITraceTypeFlow) {
2867 tty->print_cr("Initial CI Blocks");
2868 print_on(tty);
2869 }
2870 flow_types();
2871 // Watch for bailouts.
2872 if (failing()) {
2873 return;
2874 }
2876 map_blocks();
2878 if (CIPrintTypeFlow || CITraceTypeFlow) {
2879 rpo_print_on(tty);
2880 }
2881 }
2883 // ------------------------------------------------------------------
2884 // ciTypeFlow::record_failure()
2885 // The ciTypeFlow object keeps track of failure reasons separately from the ciEnv.
2886 // This is required because there is not a 1-1 relation between the ciEnv and
2887 // the TypeFlow passes within a compilation task. For example, if the compiler
2888 // is considering inlining a method, it will request a TypeFlow. If that fails,
2889 // the compilation as a whole may continue without the inlining. Some TypeFlow
2890 // requests are not optional; if they fail the requestor is responsible for
2891 // copying the failure reason up to the ciEnv. (See Parse::Parse.)
2892 void ciTypeFlow::record_failure(const char* reason) {
2893 if (env()->log() != NULL) {
2894 env()->log()->elem("failure reason='%s' phase='typeflow'", reason);
2895 }
2896 if (_failure_reason == NULL) {
2897 // Record the first failure reason.
2898 _failure_reason = reason;
2899 }
2900 }
2902 #ifndef PRODUCT
2903 // ------------------------------------------------------------------
2904 // ciTypeFlow::print_on
2905 void ciTypeFlow::print_on(outputStream* st) const {
2906 // Walk through CI blocks
2907 st->print_cr("********************************************************");
2908 st->print ("TypeFlow for ");
2909 method()->name()->print_symbol_on(st);
2910 int limit_bci = code_size();
2911 st->print_cr(" %d bytes", limit_bci);
2912 ciMethodBlocks *mblks = _methodBlocks;
2913 ciBlock* current = NULL;
2914 for (int bci = 0; bci < limit_bci; bci++) {
2915 ciBlock* blk = mblks->block_containing(bci);
2916 if (blk != NULL && blk != current) {
2917 current = blk;
2918 current->print_on(st);
2920 GrowableArray<Block*>* blocks = _idx_to_blocklist[blk->index()];
2921 int num_blocks = (blocks == NULL) ? 0 : blocks->length();
2923 if (num_blocks == 0) {
2924 st->print_cr(" No Blocks");
2925 } else {
2926 for (int i = 0; i < num_blocks; i++) {
2927 Block* block = blocks->at(i);
2928 block->print_on(st);
2929 }
2930 }
2931 st->print_cr("--------------------------------------------------------");
2932 st->cr();
2933 }
2934 }
2935 st->print_cr("********************************************************");
2936 st->cr();
2937 }
2939 void ciTypeFlow::rpo_print_on(outputStream* st) const {
2940 st->print_cr("********************************************************");
2941 st->print ("TypeFlow for ");
2942 method()->name()->print_symbol_on(st);
2943 int limit_bci = code_size();
2944 st->print_cr(" %d bytes", limit_bci);
2945 for (Block* blk = _rpo_list; blk != NULL; blk = blk->rpo_next()) {
2946 blk->print_on(st);
2947 st->print_cr("--------------------------------------------------------");
2948 st->cr();
2949 }
2950 st->print_cr("********************************************************");
2951 st->cr();
2952 }
2953 #endif
